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1da177e4 LT |
1 | /* |
2 | * file_storage.c -- File-backed USB Storage Gadget, for USB development | |
3 | * | |
12aae68a | 4 | * Copyright (C) 2003-2008 Alan Stern |
1da177e4 LT |
5 | * All rights reserved. |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions, and the following disclaimer, | |
12 | * without modification. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. The names of the above-listed copyright holders may not be used | |
17 | * to endorse or promote products derived from this software without | |
18 | * specific prior written permission. | |
19 | * | |
20 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
21 | * GNU General Public License ("GPL") as published by the Free Software | |
22 | * Foundation, either version 2 of that License or (at your option) any | |
23 | * later version. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
26 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
27 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
28 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
29 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
31 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
32 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
36 | */ | |
37 | ||
38 | ||
39 | /* | |
40 | * The File-backed Storage Gadget acts as a USB Mass Storage device, | |
12aae68a AS |
41 | * appearing to the host as a disk drive or as a CD-ROM drive. In addition |
42 | * to providing an example of a genuinely useful gadget driver for a USB | |
43 | * device, it also illustrates a technique of double-buffering for increased | |
44 | * throughput. Last but not least, it gives an easy way to probe the | |
45 | * behavior of the Mass Storage drivers in a USB host. | |
1da177e4 LT |
46 | * |
47 | * Backing storage is provided by a regular file or a block device, specified | |
48 | * by the "file" module parameter. Access can be limited to read-only by | |
12aae68a AS |
49 | * setting the optional "ro" module parameter. (For CD-ROM emulation, |
50 | * access is always read-only.) The gadget will indicate that it has | |
51 | * removable media if the optional "removable" module parameter is set. | |
1da177e4 LT |
52 | * |
53 | * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI), | |
54 | * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected | |
55 | * by the optional "transport" module parameter. It also supports the | |
56 | * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03), | |
57 | * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by | |
58 | * the optional "protocol" module parameter. In addition, the default | |
59 | * Vendor ID, Product ID, and release number can be overridden. | |
60 | * | |
61 | * There is support for multiple logical units (LUNs), each of which has | |
62 | * its own backing file. The number of LUNs can be set using the optional | |
63 | * "luns" module parameter (anywhere from 1 to 8), and the corresponding | |
64 | * files are specified using comma-separated lists for "file" and "ro". | |
65 | * The default number of LUNs is taken from the number of "file" elements; | |
66 | * it is 1 if "file" is not given. If "removable" is not set then a backing | |
67 | * file must be specified for each LUN. If it is set, then an unspecified | |
12aae68a AS |
68 | * or empty backing filename means the LUN's medium is not loaded. Ideally |
69 | * each LUN would be settable independently as a disk drive or a CD-ROM | |
70 | * drive, but currently all LUNs have to be the same type. The CD-ROM | |
71 | * emulation includes a single data track and no audio tracks; hence there | |
72 | * need be only one backing file per LUN. Note also that the CD-ROM block | |
73 | * length is set to 512 rather than the more common value 2048. | |
1da177e4 LT |
74 | * |
75 | * Requirements are modest; only a bulk-in and a bulk-out endpoint are | |
76 | * needed (an interrupt-out endpoint is also needed for CBI). The memory | |
77 | * requirement amounts to two 16K buffers, size configurable by a parameter. | |
78 | * Support is included for both full-speed and high-speed operation. | |
79 | * | |
14cd5f8e AS |
80 | * Note that the driver is slightly non-portable in that it assumes a |
81 | * single memory/DMA buffer will be useable for bulk-in, bulk-out, and | |
82 | * interrupt-in endpoints. With most device controllers this isn't an | |
83 | * issue, but there may be some with hardware restrictions that prevent | |
84 | * a buffer from being used by more than one endpoint. | |
85 | * | |
1da177e4 LT |
86 | * Module options: |
87 | * | |
88 | * file=filename[,filename...] | |
89 | * Required if "removable" is not set, names of | |
90 | * the files or block devices used for | |
91 | * backing storage | |
92 | * ro=b[,b...] Default false, booleans for read-only access | |
93 | * removable Default false, boolean for removable media | |
94 | * luns=N Default N = number of filenames, number of | |
95 | * LUNs to support | |
d794ac7a AS |
96 | * stall Default determined according to the type of |
97 | * USB device controller (usually true), | |
98 | * boolean to permit the driver to halt | |
99 | * bulk endpoints | |
12aae68a AS |
100 | * cdrom Default false, boolean for whether to emulate |
101 | * a CD-ROM drive | |
1da177e4 LT |
102 | * transport=XXX Default BBB, transport name (CB, CBI, or BBB) |
103 | * protocol=YYY Default SCSI, protocol name (RBC, 8020 or | |
104 | * ATAPI, QIC, UFI, 8070, or SCSI; | |
105 | * also 1 - 6) | |
106 | * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID | |
107 | * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID | |
108 | * release=0xRRRR Override the USB release number (bcdDevice) | |
109 | * buflen=N Default N=16384, buffer size used (will be | |
110 | * rounded down to a multiple of | |
111 | * PAGE_CACHE_SIZE) | |
1da177e4 LT |
112 | * |
113 | * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro", | |
12aae68a AS |
114 | * "removable", "luns", "stall", and "cdrom" options are available; default |
115 | * values are used for everything else. | |
1da177e4 LT |
116 | * |
117 | * The pathnames of the backing files and the ro settings are available in | |
118 | * the attribute files "file" and "ro" in the lun<n> subdirectory of the | |
119 | * gadget's sysfs directory. If the "removable" option is set, writing to | |
120 | * these files will simulate ejecting/loading the medium (writing an empty | |
121 | * line means eject) and adjusting a write-enable tab. Changes to the ro | |
12aae68a AS |
122 | * setting are not allowed when the medium is loaded or if CD-ROM emulation |
123 | * is being used. | |
1da177e4 LT |
124 | * |
125 | * This gadget driver is heavily based on "Gadget Zero" by David Brownell. | |
aafe5bd6 AS |
126 | * The driver's SCSI command interface was based on the "Information |
127 | * technology - Small Computer System Interface - 2" document from | |
128 | * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at | |
129 | * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception | |
130 | * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the | |
131 | * "Universal Serial Bus Mass Storage Class UFI Command Specification" | |
132 | * document, Revision 1.0, December 14, 1998, available at | |
133 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>. | |
1da177e4 LT |
134 | */ |
135 | ||
136 | ||
137 | /* | |
138 | * Driver Design | |
139 | * | |
140 | * The FSG driver is fairly straightforward. There is a main kernel | |
141 | * thread that handles most of the work. Interrupt routines field | |
142 | * callbacks from the controller driver: bulk- and interrupt-request | |
143 | * completion notifications, endpoint-0 events, and disconnect events. | |
144 | * Completion events are passed to the main thread by wakeup calls. Many | |
145 | * ep0 requests are handled at interrupt time, but SetInterface, | |
146 | * SetConfiguration, and device reset requests are forwarded to the | |
147 | * thread in the form of "exceptions" using SIGUSR1 signals (since they | |
148 | * should interrupt any ongoing file I/O operations). | |
149 | * | |
150 | * The thread's main routine implements the standard command/data/status | |
151 | * parts of a SCSI interaction. It and its subroutines are full of tests | |
152 | * for pending signals/exceptions -- all this polling is necessary since | |
153 | * the kernel has no setjmp/longjmp equivalents. (Maybe this is an | |
154 | * indication that the driver really wants to be running in userspace.) | |
155 | * An important point is that so long as the thread is alive it keeps an | |
156 | * open reference to the backing file. This will prevent unmounting | |
157 | * the backing file's underlying filesystem and could cause problems | |
158 | * during system shutdown, for example. To prevent such problems, the | |
159 | * thread catches INT, TERM, and KILL signals and converts them into | |
160 | * an EXIT exception. | |
161 | * | |
162 | * In normal operation the main thread is started during the gadget's | |
163 | * fsg_bind() callback and stopped during fsg_unbind(). But it can also | |
164 | * exit when it receives a signal, and there's no point leaving the | |
165 | * gadget running when the thread is dead. So just before the thread | |
166 | * exits, it deregisters the gadget driver. This makes things a little | |
167 | * tricky: The driver is deregistered at two places, and the exiting | |
168 | * thread can indirectly call fsg_unbind() which in turn can tell the | |
169 | * thread to exit. The first problem is resolved through the use of the | |
170 | * REGISTERED atomic bitflag; the driver will only be deregistered once. | |
171 | * The second problem is resolved by having fsg_unbind() check | |
172 | * fsg->state; it won't try to stop the thread if the state is already | |
173 | * FSG_STATE_TERMINATED. | |
174 | * | |
175 | * To provide maximum throughput, the driver uses a circular pipeline of | |
176 | * buffer heads (struct fsg_buffhd). In principle the pipeline can be | |
177 | * arbitrarily long; in practice the benefits don't justify having more | |
178 | * than 2 stages (i.e., double buffering). But it helps to think of the | |
179 | * pipeline as being a long one. Each buffer head contains a bulk-in and | |
180 | * a bulk-out request pointer (since the buffer can be used for both | |
181 | * output and input -- directions always are given from the host's | |
182 | * point of view) as well as a pointer to the buffer and various state | |
183 | * variables. | |
184 | * | |
185 | * Use of the pipeline follows a simple protocol. There is a variable | |
186 | * (fsg->next_buffhd_to_fill) that points to the next buffer head to use. | |
187 | * At any time that buffer head may still be in use from an earlier | |
188 | * request, so each buffer head has a state variable indicating whether | |
189 | * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the | |
190 | * buffer head to be EMPTY, filling the buffer either by file I/O or by | |
191 | * USB I/O (during which the buffer head is BUSY), and marking the buffer | |
192 | * head FULL when the I/O is complete. Then the buffer will be emptied | |
193 | * (again possibly by USB I/O, during which it is marked BUSY) and | |
194 | * finally marked EMPTY again (possibly by a completion routine). | |
195 | * | |
196 | * A module parameter tells the driver to avoid stalling the bulk | |
197 | * endpoints wherever the transport specification allows. This is | |
198 | * necessary for some UDCs like the SuperH, which cannot reliably clear a | |
199 | * halt on a bulk endpoint. However, under certain circumstances the | |
200 | * Bulk-only specification requires a stall. In such cases the driver | |
201 | * will halt the endpoint and set a flag indicating that it should clear | |
202 | * the halt in software during the next device reset. Hopefully this | |
203 | * will permit everything to work correctly. Furthermore, although the | |
204 | * specification allows the bulk-out endpoint to halt when the host sends | |
205 | * too much data, implementing this would cause an unavoidable race. | |
206 | * The driver will always use the "no-stall" approach for OUT transfers. | |
207 | * | |
208 | * One subtle point concerns sending status-stage responses for ep0 | |
209 | * requests. Some of these requests, such as device reset, can involve | |
210 | * interrupting an ongoing file I/O operation, which might take an | |
211 | * arbitrarily long time. During that delay the host might give up on | |
212 | * the original ep0 request and issue a new one. When that happens the | |
213 | * driver should not notify the host about completion of the original | |
214 | * request, as the host will no longer be waiting for it. So the driver | |
215 | * assigns to each ep0 request a unique tag, and it keeps track of the | |
216 | * tag value of the request associated with a long-running exception | |
217 | * (device-reset, interface-change, or configuration-change). When the | |
218 | * exception handler is finished, the status-stage response is submitted | |
219 | * only if the current ep0 request tag is equal to the exception request | |
220 | * tag. Thus only the most recently received ep0 request will get a | |
221 | * status-stage response. | |
222 | * | |
223 | * Warning: This driver source file is too long. It ought to be split up | |
224 | * into a header file plus about 3 separate .c files, to handle the details | |
225 | * of the Gadget, USB Mass Storage, and SCSI protocols. | |
226 | */ | |
227 | ||
228 | ||
2e806f67 | 229 | /* #define VERBOSE_DEBUG */ |
79a7d9ee | 230 | /* #define DUMP_MSGS */ |
1da177e4 | 231 | |
1da177e4 | 232 | |
1da177e4 | 233 | #include <linux/blkdev.h> |
1da177e4 LT |
234 | #include <linux/completion.h> |
235 | #include <linux/dcache.h> | |
236 | #include <linux/delay.h> | |
237 | #include <linux/device.h> | |
238 | #include <linux/fcntl.h> | |
239 | #include <linux/file.h> | |
240 | #include <linux/fs.h> | |
87c4252a | 241 | #include <linux/kref.h> |
22efcf4a | 242 | #include <linux/kthread.h> |
1da177e4 | 243 | #include <linux/limits.h> |
1da177e4 | 244 | #include <linux/rwsem.h> |
1da177e4 LT |
245 | #include <linux/slab.h> |
246 | #include <linux/spinlock.h> | |
247 | #include <linux/string.h> | |
7dfb7103 | 248 | #include <linux/freezer.h> |
1da177e4 | 249 | #include <linux/utsname.h> |
1da177e4 | 250 | |
5f848137 | 251 | #include <linux/usb/ch9.h> |
9454a57a | 252 | #include <linux/usb/gadget.h> |
1da177e4 LT |
253 | |
254 | #include "gadget_chips.h" | |
255 | ||
256 | ||
352e2b96 DB |
257 | |
258 | /* | |
259 | * Kbuild is not very cooperative with respect to linking separately | |
260 | * compiled library objects into one module. So for now we won't use | |
261 | * separate compilation ... ensuring init/exit sections work to shrink | |
262 | * the runtime footprint, and giving us at least some parts of what | |
263 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
264 | */ | |
265 | #include "usbstring.c" | |
266 | #include "config.c" | |
267 | #include "epautoconf.c" | |
268 | ||
1da177e4 LT |
269 | /*-------------------------------------------------------------------------*/ |
270 | ||
271 | #define DRIVER_DESC "File-backed Storage Gadget" | |
272 | #define DRIVER_NAME "g_file_storage" | |
12aae68a | 273 | #define DRIVER_VERSION "20 November 2008" |
1da177e4 LT |
274 | |
275 | static const char longname[] = DRIVER_DESC; | |
276 | static const char shortname[] = DRIVER_NAME; | |
277 | ||
278 | MODULE_DESCRIPTION(DRIVER_DESC); | |
279 | MODULE_AUTHOR("Alan Stern"); | |
280 | MODULE_LICENSE("Dual BSD/GPL"); | |
281 | ||
282 | /* Thanks to NetChip Technologies for donating this product ID. | |
283 | * | |
284 | * DO NOT REUSE THESE IDs with any other driver!! Ever!! | |
285 | * Instead: allocate your own, using normal USB-IF procedures. */ | |
286 | #define DRIVER_VENDOR_ID 0x0525 // NetChip | |
287 | #define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget | |
288 | ||
289 | ||
290 | /* | |
291 | * This driver assumes self-powered hardware and has no way for users to | |
292 | * trigger remote wakeup. It uses autoconfiguration to select endpoints | |
293 | * and endpoint addresses. | |
294 | */ | |
295 | ||
296 | ||
297 | /*-------------------------------------------------------------------------*/ | |
298 | ||
1da177e4 | 299 | #define LDBG(lun,fmt,args...) \ |
79a7d9ee | 300 | dev_dbg(&(lun)->dev , fmt , ## args) |
1da177e4 | 301 | #define MDBG(fmt,args...) \ |
00274921 DB |
302 | pr_debug(DRIVER_NAME ": " fmt , ## args) |
303 | ||
304 | #ifndef DEBUG | |
2e806f67 | 305 | #undef VERBOSE_DEBUG |
1da177e4 | 306 | #undef DUMP_MSGS |
00274921 | 307 | #endif /* !DEBUG */ |
1da177e4 | 308 | |
2e806f67 | 309 | #ifdef VERBOSE_DEBUG |
1da177e4 LT |
310 | #define VLDBG LDBG |
311 | #else | |
1da177e4 LT |
312 | #define VLDBG(lun,fmt,args...) \ |
313 | do { } while (0) | |
2e806f67 | 314 | #endif /* VERBOSE_DEBUG */ |
1da177e4 | 315 | |
1da177e4 | 316 | #define LERROR(lun,fmt,args...) \ |
79a7d9ee | 317 | dev_err(&(lun)->dev , fmt , ## args) |
1da177e4 | 318 | #define LWARN(lun,fmt,args...) \ |
79a7d9ee | 319 | dev_warn(&(lun)->dev , fmt , ## args) |
1da177e4 | 320 | #define LINFO(lun,fmt,args...) \ |
79a7d9ee | 321 | dev_info(&(lun)->dev , fmt , ## args) |
1da177e4 LT |
322 | |
323 | #define MINFO(fmt,args...) \ | |
00274921 | 324 | pr_info(DRIVER_NAME ": " fmt , ## args) |
1da177e4 | 325 | |
2e806f67 DB |
326 | #define DBG(d, fmt, args...) \ |
327 | dev_dbg(&(d)->gadget->dev , fmt , ## args) | |
328 | #define VDBG(d, fmt, args...) \ | |
329 | dev_vdbg(&(d)->gadget->dev , fmt , ## args) | |
330 | #define ERROR(d, fmt, args...) \ | |
331 | dev_err(&(d)->gadget->dev , fmt , ## args) | |
b6c63937 | 332 | #define WARNING(d, fmt, args...) \ |
2e806f67 DB |
333 | dev_warn(&(d)->gadget->dev , fmt , ## args) |
334 | #define INFO(d, fmt, args...) \ | |
335 | dev_info(&(d)->gadget->dev , fmt , ## args) | |
336 | ||
1da177e4 LT |
337 | |
338 | /*-------------------------------------------------------------------------*/ | |
339 | ||
340 | /* Encapsulate the module parameter settings */ | |
341 | ||
342 | #define MAX_LUNS 8 | |
343 | ||
1da177e4 | 344 | static struct { |
aafe5bd6 AS |
345 | char *file[MAX_LUNS]; |
346 | int ro[MAX_LUNS]; | |
2e806f67 DB |
347 | unsigned int num_filenames; |
348 | unsigned int num_ros; | |
1da177e4 LT |
349 | unsigned int nluns; |
350 | ||
d794ac7a AS |
351 | int removable; |
352 | int can_stall; | |
12aae68a | 353 | int cdrom; |
d794ac7a | 354 | |
1da177e4 LT |
355 | char *transport_parm; |
356 | char *protocol_parm; | |
1da177e4 LT |
357 | unsigned short vendor; |
358 | unsigned short product; | |
359 | unsigned short release; | |
360 | unsigned int buflen; | |
1da177e4 LT |
361 | |
362 | int transport_type; | |
363 | char *transport_name; | |
364 | int protocol_type; | |
365 | char *protocol_name; | |
366 | ||
367 | } mod_data = { // Default values | |
368 | .transport_parm = "BBB", | |
369 | .protocol_parm = "SCSI", | |
370 | .removable = 0, | |
d794ac7a | 371 | .can_stall = 1, |
12aae68a | 372 | .cdrom = 0, |
1da177e4 LT |
373 | .vendor = DRIVER_VENDOR_ID, |
374 | .product = DRIVER_PRODUCT_ID, | |
375 | .release = 0xffff, // Use controller chip type | |
376 | .buflen = 16384, | |
1da177e4 LT |
377 | }; |
378 | ||
379 | ||
aafe5bd6 AS |
380 | module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames, |
381 | S_IRUGO); | |
1da177e4 LT |
382 | MODULE_PARM_DESC(file, "names of backing files or devices"); |
383 | ||
aafe5bd6 | 384 | module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO); |
1da177e4 LT |
385 | MODULE_PARM_DESC(ro, "true to force read-only"); |
386 | ||
387 | module_param_named(luns, mod_data.nluns, uint, S_IRUGO); | |
388 | MODULE_PARM_DESC(luns, "number of LUNs"); | |
389 | ||
390 | module_param_named(removable, mod_data.removable, bool, S_IRUGO); | |
391 | MODULE_PARM_DESC(removable, "true to simulate removable media"); | |
392 | ||
d794ac7a AS |
393 | module_param_named(stall, mod_data.can_stall, bool, S_IRUGO); |
394 | MODULE_PARM_DESC(stall, "false to prevent bulk stalls"); | |
395 | ||
12aae68a AS |
396 | module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO); |
397 | MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk"); | |
398 | ||
1da177e4 LT |
399 | |
400 | /* In the non-TEST version, only the module parameters listed above | |
401 | * are available. */ | |
402 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
403 | ||
404 | module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO); | |
405 | MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)"); | |
406 | ||
407 | module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO); | |
408 | MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, " | |
409 | "8070, or SCSI)"); | |
410 | ||
411 | module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO); | |
412 | MODULE_PARM_DESC(vendor, "USB Vendor ID"); | |
413 | ||
414 | module_param_named(product, mod_data.product, ushort, S_IRUGO); | |
415 | MODULE_PARM_DESC(product, "USB Product ID"); | |
416 | ||
417 | module_param_named(release, mod_data.release, ushort, S_IRUGO); | |
418 | MODULE_PARM_DESC(release, "USB release number"); | |
419 | ||
420 | module_param_named(buflen, mod_data.buflen, uint, S_IRUGO); | |
421 | MODULE_PARM_DESC(buflen, "I/O buffer size"); | |
422 | ||
1da177e4 LT |
423 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ |
424 | ||
425 | ||
426 | /*-------------------------------------------------------------------------*/ | |
427 | ||
12aae68a AS |
428 | /* SCSI device types */ |
429 | #define TYPE_DISK 0x00 | |
430 | #define TYPE_CDROM 0x05 | |
431 | ||
1da177e4 LT |
432 | /* USB protocol value = the transport method */ |
433 | #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt | |
434 | #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt | |
435 | #define USB_PR_BULK 0x50 // Bulk-only | |
436 | ||
437 | /* USB subclass value = the protocol encapsulation */ | |
438 | #define USB_SC_RBC 0x01 // Reduced Block Commands (flash) | |
439 | #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM) | |
440 | #define USB_SC_QIC 0x03 // QIC-157 (tape) | |
441 | #define USB_SC_UFI 0x04 // UFI (floppy) | |
442 | #define USB_SC_8070 0x05 // SFF-8070i (removable) | |
443 | #define USB_SC_SCSI 0x06 // Transparent SCSI | |
444 | ||
445 | /* Bulk-only data structures */ | |
446 | ||
447 | /* Command Block Wrapper */ | |
448 | struct bulk_cb_wrap { | |
449 | __le32 Signature; // Contains 'USBC' | |
450 | u32 Tag; // Unique per command id | |
451 | __le32 DataTransferLength; // Size of the data | |
452 | u8 Flags; // Direction in bit 7 | |
453 | u8 Lun; // LUN (normally 0) | |
454 | u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE | |
455 | u8 CDB[16]; // Command Data Block | |
456 | }; | |
457 | ||
458 | #define USB_BULK_CB_WRAP_LEN 31 | |
459 | #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC | |
460 | #define USB_BULK_IN_FLAG 0x80 | |
461 | ||
462 | /* Command Status Wrapper */ | |
463 | struct bulk_cs_wrap { | |
464 | __le32 Signature; // Should = 'USBS' | |
465 | u32 Tag; // Same as original command | |
466 | __le32 Residue; // Amount not transferred | |
467 | u8 Status; // See below | |
468 | }; | |
469 | ||
470 | #define USB_BULK_CS_WRAP_LEN 13 | |
471 | #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS' | |
472 | #define USB_STATUS_PASS 0 | |
473 | #define USB_STATUS_FAIL 1 | |
474 | #define USB_STATUS_PHASE_ERROR 2 | |
475 | ||
476 | /* Bulk-only class specific requests */ | |
477 | #define USB_BULK_RESET_REQUEST 0xff | |
478 | #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe | |
479 | ||
480 | ||
481 | /* CBI Interrupt data structure */ | |
482 | struct interrupt_data { | |
483 | u8 bType; | |
484 | u8 bValue; | |
485 | }; | |
486 | ||
487 | #define CBI_INTERRUPT_DATA_LEN 2 | |
488 | ||
489 | /* CBI Accept Device-Specific Command request */ | |
490 | #define USB_CBI_ADSC_REQUEST 0x00 | |
491 | ||
492 | ||
493 | #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block | |
494 | ||
495 | /* SCSI commands that we recognize */ | |
496 | #define SC_FORMAT_UNIT 0x04 | |
497 | #define SC_INQUIRY 0x12 | |
498 | #define SC_MODE_SELECT_6 0x15 | |
499 | #define SC_MODE_SELECT_10 0x55 | |
500 | #define SC_MODE_SENSE_6 0x1a | |
501 | #define SC_MODE_SENSE_10 0x5a | |
502 | #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e | |
503 | #define SC_READ_6 0x08 | |
504 | #define SC_READ_10 0x28 | |
505 | #define SC_READ_12 0xa8 | |
506 | #define SC_READ_CAPACITY 0x25 | |
507 | #define SC_READ_FORMAT_CAPACITIES 0x23 | |
12aae68a AS |
508 | #define SC_READ_HEADER 0x44 |
509 | #define SC_READ_TOC 0x43 | |
1da177e4 LT |
510 | #define SC_RELEASE 0x17 |
511 | #define SC_REQUEST_SENSE 0x03 | |
512 | #define SC_RESERVE 0x16 | |
513 | #define SC_SEND_DIAGNOSTIC 0x1d | |
514 | #define SC_START_STOP_UNIT 0x1b | |
515 | #define SC_SYNCHRONIZE_CACHE 0x35 | |
516 | #define SC_TEST_UNIT_READY 0x00 | |
517 | #define SC_VERIFY 0x2f | |
518 | #define SC_WRITE_6 0x0a | |
519 | #define SC_WRITE_10 0x2a | |
520 | #define SC_WRITE_12 0xaa | |
521 | ||
522 | /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ | |
523 | #define SS_NO_SENSE 0 | |
524 | #define SS_COMMUNICATION_FAILURE 0x040800 | |
525 | #define SS_INVALID_COMMAND 0x052000 | |
526 | #define SS_INVALID_FIELD_IN_CDB 0x052400 | |
527 | #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 | |
528 | #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 | |
529 | #define SS_MEDIUM_NOT_PRESENT 0x023a00 | |
530 | #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 | |
531 | #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 | |
532 | #define SS_RESET_OCCURRED 0x062900 | |
533 | #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 | |
534 | #define SS_UNRECOVERED_READ_ERROR 0x031100 | |
535 | #define SS_WRITE_ERROR 0x030c02 | |
536 | #define SS_WRITE_PROTECTED 0x072700 | |
537 | ||
538 | #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc. | |
539 | #define ASC(x) ((u8) ((x) >> 8)) | |
540 | #define ASCQ(x) ((u8) (x)) | |
541 | ||
542 | ||
543 | /*-------------------------------------------------------------------------*/ | |
544 | ||
545 | /* | |
546 | * These definitions will permit the compiler to avoid generating code for | |
547 | * parts of the driver that aren't used in the non-TEST version. Even gcc | |
548 | * can recognize when a test of a constant expression yields a dead code | |
549 | * path. | |
550 | */ | |
551 | ||
552 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
553 | ||
554 | #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK) | |
555 | #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI) | |
556 | #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI) | |
557 | ||
558 | #else | |
559 | ||
560 | #define transport_is_bbb() 1 | |
561 | #define transport_is_cbi() 0 | |
562 | #define protocol_is_scsi() 1 | |
563 | ||
564 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
565 | ||
566 | ||
567 | struct lun { | |
568 | struct file *filp; | |
569 | loff_t file_length; | |
570 | loff_t num_sectors; | |
571 | ||
572 | unsigned int ro : 1; | |
573 | unsigned int prevent_medium_removal : 1; | |
574 | unsigned int registered : 1; | |
6174d0fd | 575 | unsigned int info_valid : 1; |
1da177e4 LT |
576 | |
577 | u32 sense_data; | |
578 | u32 sense_data_info; | |
579 | u32 unit_attention_data; | |
580 | ||
581 | struct device dev; | |
582 | }; | |
583 | ||
584 | #define backing_file_is_open(curlun) ((curlun)->filp != NULL) | |
585 | ||
79a7d9ee | 586 | static struct lun *dev_to_lun(struct device *dev) |
1da177e4 LT |
587 | { |
588 | return container_of(dev, struct lun, dev); | |
589 | } | |
590 | ||
591 | ||
592 | /* Big enough to hold our biggest descriptor */ | |
593 | #define EP0_BUFSIZE 256 | |
594 | #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value | |
595 | ||
596 | /* Number of buffers we will use. 2 is enough for double-buffering */ | |
597 | #define NUM_BUFFERS 2 | |
598 | ||
599 | enum fsg_buffer_state { | |
600 | BUF_STATE_EMPTY = 0, | |
601 | BUF_STATE_FULL, | |
602 | BUF_STATE_BUSY | |
603 | }; | |
604 | ||
605 | struct fsg_buffhd { | |
606 | void *buf; | |
a21d4fed | 607 | enum fsg_buffer_state state; |
1da177e4 LT |
608 | struct fsg_buffhd *next; |
609 | ||
610 | /* The NetChip 2280 is faster, and handles some protocol faults | |
611 | * better, if we don't submit any short bulk-out read requests. | |
612 | * So we will record the intended request length here. */ | |
613 | unsigned int bulk_out_intended_length; | |
614 | ||
615 | struct usb_request *inreq; | |
a21d4fed | 616 | int inreq_busy; |
1da177e4 | 617 | struct usb_request *outreq; |
a21d4fed | 618 | int outreq_busy; |
1da177e4 LT |
619 | }; |
620 | ||
621 | enum fsg_state { | |
622 | FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere | |
623 | FSG_STATE_DATA_PHASE, | |
624 | FSG_STATE_STATUS_PHASE, | |
625 | ||
626 | FSG_STATE_IDLE = 0, | |
627 | FSG_STATE_ABORT_BULK_OUT, | |
628 | FSG_STATE_RESET, | |
629 | FSG_STATE_INTERFACE_CHANGE, | |
630 | FSG_STATE_CONFIG_CHANGE, | |
631 | FSG_STATE_DISCONNECT, | |
632 | FSG_STATE_EXIT, | |
633 | FSG_STATE_TERMINATED | |
634 | }; | |
635 | ||
636 | enum data_direction { | |
637 | DATA_DIR_UNKNOWN = 0, | |
638 | DATA_DIR_FROM_HOST, | |
639 | DATA_DIR_TO_HOST, | |
640 | DATA_DIR_NONE | |
641 | }; | |
642 | ||
643 | struct fsg_dev { | |
644 | /* lock protects: state, all the req_busy's, and cbbuf_cmnd */ | |
645 | spinlock_t lock; | |
646 | struct usb_gadget *gadget; | |
647 | ||
648 | /* filesem protects: backing files in use */ | |
649 | struct rw_semaphore filesem; | |
650 | ||
87c4252a AS |
651 | /* reference counting: wait until all LUNs are released */ |
652 | struct kref ref; | |
653 | ||
1da177e4 LT |
654 | struct usb_ep *ep0; // Handy copy of gadget->ep0 |
655 | struct usb_request *ep0req; // For control responses | |
a21d4fed | 656 | unsigned int ep0_req_tag; |
1da177e4 LT |
657 | const char *ep0req_name; |
658 | ||
659 | struct usb_request *intreq; // For interrupt responses | |
a21d4fed | 660 | int intreq_busy; |
1da177e4 LT |
661 | struct fsg_buffhd *intr_buffhd; |
662 | ||
663 | unsigned int bulk_out_maxpacket; | |
664 | enum fsg_state state; // For exception handling | |
665 | unsigned int exception_req_tag; | |
666 | ||
667 | u8 config, new_config; | |
668 | ||
669 | unsigned int running : 1; | |
670 | unsigned int bulk_in_enabled : 1; | |
671 | unsigned int bulk_out_enabled : 1; | |
672 | unsigned int intr_in_enabled : 1; | |
673 | unsigned int phase_error : 1; | |
674 | unsigned int short_packet_received : 1; | |
675 | unsigned int bad_lun_okay : 1; | |
676 | ||
677 | unsigned long atomic_bitflags; | |
678 | #define REGISTERED 0 | |
b950bdbc | 679 | #define IGNORE_BULK_OUT 1 |
1da177e4 LT |
680 | #define SUSPENDED 2 |
681 | ||
682 | struct usb_ep *bulk_in; | |
683 | struct usb_ep *bulk_out; | |
684 | struct usb_ep *intr_in; | |
685 | ||
686 | struct fsg_buffhd *next_buffhd_to_fill; | |
687 | struct fsg_buffhd *next_buffhd_to_drain; | |
688 | struct fsg_buffhd buffhds[NUM_BUFFERS]; | |
689 | ||
1da177e4 LT |
690 | int thread_wakeup_needed; |
691 | struct completion thread_notifier; | |
1da177e4 | 692 | struct task_struct *thread_task; |
1da177e4 LT |
693 | |
694 | int cmnd_size; | |
695 | u8 cmnd[MAX_COMMAND_SIZE]; | |
696 | enum data_direction data_dir; | |
697 | u32 data_size; | |
698 | u32 data_size_from_cmnd; | |
699 | u32 tag; | |
700 | unsigned int lun; | |
701 | u32 residue; | |
702 | u32 usb_amount_left; | |
703 | ||
704 | /* The CB protocol offers no way for a host to know when a command | |
705 | * has completed. As a result the next command may arrive early, | |
706 | * and we will still have to handle it. For that reason we need | |
707 | * a buffer to store new commands when using CB (or CBI, which | |
708 | * does not oblige a host to wait for command completion either). */ | |
709 | int cbbuf_cmnd_size; | |
710 | u8 cbbuf_cmnd[MAX_COMMAND_SIZE]; | |
711 | ||
712 | unsigned int nluns; | |
713 | struct lun *luns; | |
714 | struct lun *curlun; | |
1da177e4 LT |
715 | }; |
716 | ||
717 | typedef void (*fsg_routine_t)(struct fsg_dev *); | |
718 | ||
79a7d9ee | 719 | static int exception_in_progress(struct fsg_dev *fsg) |
1da177e4 LT |
720 | { |
721 | return (fsg->state > FSG_STATE_IDLE); | |
722 | } | |
723 | ||
724 | /* Make bulk-out requests be divisible by the maxpacket size */ | |
79a7d9ee | 725 | static void set_bulk_out_req_length(struct fsg_dev *fsg, |
1da177e4 LT |
726 | struct fsg_buffhd *bh, unsigned int length) |
727 | { | |
728 | unsigned int rem; | |
729 | ||
730 | bh->bulk_out_intended_length = length; | |
731 | rem = length % fsg->bulk_out_maxpacket; | |
732 | if (rem > 0) | |
733 | length += fsg->bulk_out_maxpacket - rem; | |
734 | bh->outreq->length = length; | |
735 | } | |
736 | ||
737 | static struct fsg_dev *the_fsg; | |
738 | static struct usb_gadget_driver fsg_driver; | |
739 | ||
740 | static void close_backing_file(struct lun *curlun); | |
1da177e4 LT |
741 | |
742 | ||
743 | /*-------------------------------------------------------------------------*/ | |
744 | ||
745 | #ifdef DUMP_MSGS | |
746 | ||
747 | static void dump_msg(struct fsg_dev *fsg, const char *label, | |
748 | const u8 *buf, unsigned int length) | |
749 | { | |
79a7d9ee AS |
750 | if (length < 512) { |
751 | DBG(fsg, "%s, length %u:\n", label, length); | |
752 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, | |
753 | 16, 1, buf, length, 0); | |
1da177e4 LT |
754 | } |
755 | } | |
756 | ||
79a7d9ee | 757 | static void dump_cdb(struct fsg_dev *fsg) |
1da177e4 LT |
758 | {} |
759 | ||
760 | #else | |
761 | ||
79a7d9ee | 762 | static void dump_msg(struct fsg_dev *fsg, const char *label, |
1da177e4 LT |
763 | const u8 *buf, unsigned int length) |
764 | {} | |
765 | ||
79a7d9ee | 766 | #ifdef VERBOSE_DEBUG |
1da177e4 | 767 | |
79a7d9ee AS |
768 | static void dump_cdb(struct fsg_dev *fsg) |
769 | { | |
770 | print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, | |
771 | 16, 1, fsg->cmnd, fsg->cmnd_size, 0); | |
1da177e4 LT |
772 | } |
773 | ||
79a7d9ee AS |
774 | #else |
775 | ||
776 | static void dump_cdb(struct fsg_dev *fsg) | |
777 | {} | |
778 | ||
779 | #endif /* VERBOSE_DEBUG */ | |
1da177e4 LT |
780 | #endif /* DUMP_MSGS */ |
781 | ||
782 | ||
783 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) | |
784 | { | |
785 | const char *name; | |
786 | ||
787 | if (ep == fsg->bulk_in) | |
788 | name = "bulk-in"; | |
789 | else if (ep == fsg->bulk_out) | |
790 | name = "bulk-out"; | |
791 | else | |
792 | name = ep->name; | |
793 | DBG(fsg, "%s set halt\n", name); | |
794 | return usb_ep_set_halt(ep); | |
795 | } | |
796 | ||
797 | ||
798 | /*-------------------------------------------------------------------------*/ | |
799 | ||
800 | /* Routines for unaligned data access */ | |
801 | ||
79a7d9ee | 802 | static u16 get_be16(u8 *buf) |
1da177e4 LT |
803 | { |
804 | return ((u16) buf[0] << 8) | ((u16) buf[1]); | |
805 | } | |
806 | ||
79a7d9ee | 807 | static u32 get_be32(u8 *buf) |
1da177e4 LT |
808 | { |
809 | return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) | | |
810 | ((u32) buf[2] << 8) | ((u32) buf[3]); | |
811 | } | |
812 | ||
79a7d9ee | 813 | static void put_be16(u8 *buf, u16 val) |
1da177e4 LT |
814 | { |
815 | buf[0] = val >> 8; | |
816 | buf[1] = val; | |
817 | } | |
818 | ||
79a7d9ee | 819 | static void put_be32(u8 *buf, u32 val) |
1da177e4 LT |
820 | { |
821 | buf[0] = val >> 24; | |
822 | buf[1] = val >> 16; | |
823 | buf[2] = val >> 8; | |
1bbc1696 | 824 | buf[3] = val & 0xff; |
1da177e4 LT |
825 | } |
826 | ||
827 | ||
828 | /*-------------------------------------------------------------------------*/ | |
829 | ||
830 | /* | |
831 | * DESCRIPTORS ... most are static, but strings and (full) configuration | |
832 | * descriptors are built on demand. Also the (static) config and interface | |
833 | * descriptors are adjusted during fsg_bind(). | |
834 | */ | |
835 | #define STRING_MANUFACTURER 1 | |
836 | #define STRING_PRODUCT 2 | |
837 | #define STRING_SERIAL 3 | |
838 | #define STRING_CONFIG 4 | |
839 | #define STRING_INTERFACE 5 | |
840 | ||
841 | /* There is only one configuration. */ | |
842 | #define CONFIG_VALUE 1 | |
843 | ||
844 | static struct usb_device_descriptor | |
845 | device_desc = { | |
846 | .bLength = sizeof device_desc, | |
847 | .bDescriptorType = USB_DT_DEVICE, | |
848 | ||
551509d2 | 849 | .bcdUSB = cpu_to_le16(0x0200), |
1da177e4 LT |
850 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
851 | ||
852 | /* The next three values can be overridden by module parameters */ | |
551509d2 HH |
853 | .idVendor = cpu_to_le16(DRIVER_VENDOR_ID), |
854 | .idProduct = cpu_to_le16(DRIVER_PRODUCT_ID), | |
855 | .bcdDevice = cpu_to_le16(0xffff), | |
1da177e4 LT |
856 | |
857 | .iManufacturer = STRING_MANUFACTURER, | |
858 | .iProduct = STRING_PRODUCT, | |
859 | .iSerialNumber = STRING_SERIAL, | |
860 | .bNumConfigurations = 1, | |
861 | }; | |
862 | ||
863 | static struct usb_config_descriptor | |
864 | config_desc = { | |
865 | .bLength = sizeof config_desc, | |
866 | .bDescriptorType = USB_DT_CONFIG, | |
867 | ||
868 | /* wTotalLength computed by usb_gadget_config_buf() */ | |
869 | .bNumInterfaces = 1, | |
870 | .bConfigurationValue = CONFIG_VALUE, | |
871 | .iConfiguration = STRING_CONFIG, | |
872 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, | |
36e893d2 | 873 | .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2, |
1da177e4 LT |
874 | }; |
875 | ||
876 | static struct usb_otg_descriptor | |
877 | otg_desc = { | |
878 | .bLength = sizeof(otg_desc), | |
879 | .bDescriptorType = USB_DT_OTG, | |
880 | ||
881 | .bmAttributes = USB_OTG_SRP, | |
882 | }; | |
883 | ||
884 | /* There is only one interface. */ | |
885 | ||
886 | static struct usb_interface_descriptor | |
887 | intf_desc = { | |
888 | .bLength = sizeof intf_desc, | |
889 | .bDescriptorType = USB_DT_INTERFACE, | |
890 | ||
891 | .bNumEndpoints = 2, // Adjusted during fsg_bind() | |
892 | .bInterfaceClass = USB_CLASS_MASS_STORAGE, | |
893 | .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind() | |
894 | .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind() | |
895 | .iInterface = STRING_INTERFACE, | |
896 | }; | |
897 | ||
898 | /* Three full-speed endpoint descriptors: bulk-in, bulk-out, | |
899 | * and interrupt-in. */ | |
900 | ||
901 | static struct usb_endpoint_descriptor | |
902 | fs_bulk_in_desc = { | |
903 | .bLength = USB_DT_ENDPOINT_SIZE, | |
904 | .bDescriptorType = USB_DT_ENDPOINT, | |
905 | ||
906 | .bEndpointAddress = USB_DIR_IN, | |
907 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
908 | /* wMaxPacketSize set by autoconfiguration */ | |
909 | }; | |
910 | ||
911 | static struct usb_endpoint_descriptor | |
912 | fs_bulk_out_desc = { | |
913 | .bLength = USB_DT_ENDPOINT_SIZE, | |
914 | .bDescriptorType = USB_DT_ENDPOINT, | |
915 | ||
916 | .bEndpointAddress = USB_DIR_OUT, | |
917 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
918 | /* wMaxPacketSize set by autoconfiguration */ | |
919 | }; | |
920 | ||
921 | static struct usb_endpoint_descriptor | |
922 | fs_intr_in_desc = { | |
923 | .bLength = USB_DT_ENDPOINT_SIZE, | |
924 | .bDescriptorType = USB_DT_ENDPOINT, | |
925 | ||
926 | .bEndpointAddress = USB_DIR_IN, | |
927 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 928 | .wMaxPacketSize = cpu_to_le16(2), |
1da177e4 LT |
929 | .bInterval = 32, // frames -> 32 ms |
930 | }; | |
931 | ||
932 | static const struct usb_descriptor_header *fs_function[] = { | |
933 | (struct usb_descriptor_header *) &otg_desc, | |
934 | (struct usb_descriptor_header *) &intf_desc, | |
935 | (struct usb_descriptor_header *) &fs_bulk_in_desc, | |
936 | (struct usb_descriptor_header *) &fs_bulk_out_desc, | |
937 | (struct usb_descriptor_header *) &fs_intr_in_desc, | |
938 | NULL, | |
939 | }; | |
940 | #define FS_FUNCTION_PRE_EP_ENTRIES 2 | |
941 | ||
942 | ||
1da177e4 LT |
943 | /* |
944 | * USB 2.0 devices need to expose both high speed and full speed | |
945 | * descriptors, unless they only run at full speed. | |
946 | * | |
947 | * That means alternate endpoint descriptors (bigger packets) | |
948 | * and a "device qualifier" ... plus more construction options | |
949 | * for the config descriptor. | |
950 | */ | |
951 | static struct usb_qualifier_descriptor | |
952 | dev_qualifier = { | |
953 | .bLength = sizeof dev_qualifier, | |
954 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
955 | ||
551509d2 | 956 | .bcdUSB = cpu_to_le16(0x0200), |
1da177e4 LT |
957 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
958 | ||
959 | .bNumConfigurations = 1, | |
960 | }; | |
961 | ||
962 | static struct usb_endpoint_descriptor | |
963 | hs_bulk_in_desc = { | |
964 | .bLength = USB_DT_ENDPOINT_SIZE, | |
965 | .bDescriptorType = USB_DT_ENDPOINT, | |
966 | ||
967 | /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ | |
968 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 969 | .wMaxPacketSize = cpu_to_le16(512), |
1da177e4 LT |
970 | }; |
971 | ||
972 | static struct usb_endpoint_descriptor | |
973 | hs_bulk_out_desc = { | |
974 | .bLength = USB_DT_ENDPOINT_SIZE, | |
975 | .bDescriptorType = USB_DT_ENDPOINT, | |
976 | ||
977 | /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ | |
978 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 979 | .wMaxPacketSize = cpu_to_le16(512), |
1da177e4 LT |
980 | .bInterval = 1, // NAK every 1 uframe |
981 | }; | |
982 | ||
983 | static struct usb_endpoint_descriptor | |
984 | hs_intr_in_desc = { | |
985 | .bLength = USB_DT_ENDPOINT_SIZE, | |
986 | .bDescriptorType = USB_DT_ENDPOINT, | |
987 | ||
988 | /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ | |
989 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 990 | .wMaxPacketSize = cpu_to_le16(2), |
1da177e4 LT |
991 | .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms |
992 | }; | |
993 | ||
994 | static const struct usb_descriptor_header *hs_function[] = { | |
995 | (struct usb_descriptor_header *) &otg_desc, | |
996 | (struct usb_descriptor_header *) &intf_desc, | |
997 | (struct usb_descriptor_header *) &hs_bulk_in_desc, | |
998 | (struct usb_descriptor_header *) &hs_bulk_out_desc, | |
999 | (struct usb_descriptor_header *) &hs_intr_in_desc, | |
1000 | NULL, | |
1001 | }; | |
1002 | #define HS_FUNCTION_PRE_EP_ENTRIES 2 | |
1003 | ||
1004 | /* Maxpacket and other transfer characteristics vary by speed. */ | |
79a7d9ee | 1005 | static struct usb_endpoint_descriptor * |
2e806f67 DB |
1006 | ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, |
1007 | struct usb_endpoint_descriptor *hs) | |
1008 | { | |
1009 | if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
1010 | return hs; | |
1011 | return fs; | |
1012 | } | |
1da177e4 LT |
1013 | |
1014 | ||
1015 | /* The CBI specification limits the serial string to 12 uppercase hexadecimal | |
1016 | * characters. */ | |
1017 | static char manufacturer[64]; | |
1018 | static char serial[13]; | |
1019 | ||
1020 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ | |
1021 | static struct usb_string strings[] = { | |
1022 | {STRING_MANUFACTURER, manufacturer}, | |
1023 | {STRING_PRODUCT, longname}, | |
1024 | {STRING_SERIAL, serial}, | |
1025 | {STRING_CONFIG, "Self-powered"}, | |
1026 | {STRING_INTERFACE, "Mass Storage"}, | |
1027 | {} | |
1028 | }; | |
1029 | ||
1030 | static struct usb_gadget_strings stringtab = { | |
1031 | .language = 0x0409, // en-us | |
1032 | .strings = strings, | |
1033 | }; | |
1034 | ||
1035 | ||
1036 | /* | |
1037 | * Config descriptors must agree with the code that sets configurations | |
1038 | * and with code managing interfaces and their altsettings. They must | |
1039 | * also handle different speeds and other-speed requests. | |
1040 | */ | |
1041 | static int populate_config_buf(struct usb_gadget *gadget, | |
1042 | u8 *buf, u8 type, unsigned index) | |
1043 | { | |
1da177e4 | 1044 | enum usb_device_speed speed = gadget->speed; |
1da177e4 LT |
1045 | int len; |
1046 | const struct usb_descriptor_header **function; | |
1047 | ||
1048 | if (index > 0) | |
1049 | return -EINVAL; | |
1050 | ||
2e806f67 | 1051 | if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG) |
1da177e4 | 1052 | speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed; |
2e806f67 | 1053 | if (gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH) |
1da177e4 LT |
1054 | function = hs_function; |
1055 | else | |
1da177e4 LT |
1056 | function = fs_function; |
1057 | ||
1058 | /* for now, don't advertise srp-only devices */ | |
2e806f67 | 1059 | if (!gadget_is_otg(gadget)) |
1da177e4 LT |
1060 | function++; |
1061 | ||
1062 | len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function); | |
1063 | ((struct usb_config_descriptor *) buf)->bDescriptorType = type; | |
1064 | return len; | |
1065 | } | |
1066 | ||
1067 | ||
1068 | /*-------------------------------------------------------------------------*/ | |
1069 | ||
1070 | /* These routines may be called in process context or in_irq */ | |
1071 | ||
a21d4fed | 1072 | /* Caller must hold fsg->lock */ |
1da177e4 LT |
1073 | static void wakeup_thread(struct fsg_dev *fsg) |
1074 | { | |
1075 | /* Tell the main thread that something has happened */ | |
1076 | fsg->thread_wakeup_needed = 1; | |
a21d4fed AS |
1077 | if (fsg->thread_task) |
1078 | wake_up_process(fsg->thread_task); | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | ||
1082 | static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state) | |
1083 | { | |
1084 | unsigned long flags; | |
1da177e4 LT |
1085 | |
1086 | /* Do nothing if a higher-priority exception is already in progress. | |
1087 | * If a lower-or-equal priority exception is in progress, preempt it | |
1088 | * and notify the main thread by sending it a signal. */ | |
1089 | spin_lock_irqsave(&fsg->lock, flags); | |
1090 | if (fsg->state <= new_state) { | |
1091 | fsg->exception_req_tag = fsg->ep0_req_tag; | |
1092 | fsg->state = new_state; | |
22efcf4a AS |
1093 | if (fsg->thread_task) |
1094 | send_sig_info(SIGUSR1, SEND_SIG_FORCED, | |
1095 | fsg->thread_task); | |
1da177e4 LT |
1096 | } |
1097 | spin_unlock_irqrestore(&fsg->lock, flags); | |
1098 | } | |
1099 | ||
1100 | ||
1101 | /*-------------------------------------------------------------------------*/ | |
1102 | ||
1103 | /* The disconnect callback and ep0 routines. These always run in_irq, | |
1104 | * except that ep0_queue() is called in the main thread to acknowledge | |
1105 | * completion of various requests: set config, set interface, and | |
1106 | * Bulk-only device reset. */ | |
1107 | ||
1108 | static void fsg_disconnect(struct usb_gadget *gadget) | |
1109 | { | |
1110 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
1111 | ||
1112 | DBG(fsg, "disconnect or port reset\n"); | |
1113 | raise_exception(fsg, FSG_STATE_DISCONNECT); | |
1114 | } | |
1115 | ||
1116 | ||
1117 | static int ep0_queue(struct fsg_dev *fsg) | |
1118 | { | |
1119 | int rc; | |
1120 | ||
1121 | rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC); | |
1122 | if (rc != 0 && rc != -ESHUTDOWN) { | |
1123 | ||
1124 | /* We can't do much more than wait for a reset */ | |
b6c63937 | 1125 | WARNING(fsg, "error in submission: %s --> %d\n", |
1da177e4 LT |
1126 | fsg->ep0->name, rc); |
1127 | } | |
1128 | return rc; | |
1129 | } | |
1130 | ||
1131 | static void ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
1132 | { | |
7ca46b86 | 1133 | struct fsg_dev *fsg = ep->driver_data; |
1da177e4 LT |
1134 | |
1135 | if (req->actual > 0) | |
1136 | dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual); | |
1137 | if (req->status || req->actual != req->length) | |
441b62c1 | 1138 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
1139 | req->status, req->actual, req->length); |
1140 | if (req->status == -ECONNRESET) // Request was cancelled | |
1141 | usb_ep_fifo_flush(ep); | |
1142 | ||
1143 | if (req->status == 0 && req->context) | |
1144 | ((fsg_routine_t) (req->context))(fsg); | |
1145 | } | |
1146 | ||
1147 | ||
1148 | /*-------------------------------------------------------------------------*/ | |
1149 | ||
1150 | /* Bulk and interrupt endpoint completion handlers. | |
1151 | * These always run in_irq. */ | |
1152 | ||
1153 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) | |
1154 | { | |
7ca46b86 JD |
1155 | struct fsg_dev *fsg = ep->driver_data; |
1156 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
1157 | |
1158 | if (req->status || req->actual != req->length) | |
441b62c1 | 1159 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
1160 | req->status, req->actual, req->length); |
1161 | if (req->status == -ECONNRESET) // Request was cancelled | |
1162 | usb_ep_fifo_flush(ep); | |
1163 | ||
1164 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 1165 | smp_wmb(); |
1da177e4 LT |
1166 | spin_lock(&fsg->lock); |
1167 | bh->inreq_busy = 0; | |
1168 | bh->state = BUF_STATE_EMPTY; | |
1da177e4 | 1169 | wakeup_thread(fsg); |
a21d4fed | 1170 | spin_unlock(&fsg->lock); |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) | |
1174 | { | |
7ca46b86 JD |
1175 | struct fsg_dev *fsg = ep->driver_data; |
1176 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
1177 | |
1178 | dump_msg(fsg, "bulk-out", req->buf, req->actual); | |
1179 | if (req->status || req->actual != bh->bulk_out_intended_length) | |
441b62c1 | 1180 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
1181 | req->status, req->actual, |
1182 | bh->bulk_out_intended_length); | |
1183 | if (req->status == -ECONNRESET) // Request was cancelled | |
1184 | usb_ep_fifo_flush(ep); | |
1185 | ||
1186 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 1187 | smp_wmb(); |
1da177e4 LT |
1188 | spin_lock(&fsg->lock); |
1189 | bh->outreq_busy = 0; | |
1190 | bh->state = BUF_STATE_FULL; | |
1da177e4 | 1191 | wakeup_thread(fsg); |
a21d4fed | 1192 | spin_unlock(&fsg->lock); |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | ||
1196 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
1197 | static void intr_in_complete(struct usb_ep *ep, struct usb_request *req) | |
1198 | { | |
7ca46b86 JD |
1199 | struct fsg_dev *fsg = ep->driver_data; |
1200 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
1201 | |
1202 | if (req->status || req->actual != req->length) | |
441b62c1 | 1203 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
1204 | req->status, req->actual, req->length); |
1205 | if (req->status == -ECONNRESET) // Request was cancelled | |
1206 | usb_ep_fifo_flush(ep); | |
1207 | ||
1208 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 1209 | smp_wmb(); |
1da177e4 LT |
1210 | spin_lock(&fsg->lock); |
1211 | fsg->intreq_busy = 0; | |
1212 | bh->state = BUF_STATE_EMPTY; | |
1da177e4 | 1213 | wakeup_thread(fsg); |
a21d4fed | 1214 | spin_unlock(&fsg->lock); |
1da177e4 LT |
1215 | } |
1216 | ||
1217 | #else | |
1218 | static void intr_in_complete(struct usb_ep *ep, struct usb_request *req) | |
1219 | {} | |
1220 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
1221 | ||
1222 | ||
1223 | /*-------------------------------------------------------------------------*/ | |
1224 | ||
1225 | /* Ep0 class-specific handlers. These always run in_irq. */ | |
1226 | ||
1227 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
1228 | static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1229 | { | |
1230 | struct usb_request *req = fsg->ep0req; | |
1231 | static u8 cbi_reset_cmnd[6] = { | |
1232 | SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff}; | |
1233 | ||
1234 | /* Error in command transfer? */ | |
1235 | if (req->status || req->length != req->actual || | |
1236 | req->actual < 6 || req->actual > MAX_COMMAND_SIZE) { | |
1237 | ||
1238 | /* Not all controllers allow a protocol stall after | |
1239 | * receiving control-out data, but we'll try anyway. */ | |
1240 | fsg_set_halt(fsg, fsg->ep0); | |
1241 | return; // Wait for reset | |
1242 | } | |
1243 | ||
1244 | /* Is it the special reset command? */ | |
1245 | if (req->actual >= sizeof cbi_reset_cmnd && | |
1246 | memcmp(req->buf, cbi_reset_cmnd, | |
1247 | sizeof cbi_reset_cmnd) == 0) { | |
1248 | ||
1249 | /* Raise an exception to stop the current operation | |
1250 | * and reinitialize our state. */ | |
1251 | DBG(fsg, "cbi reset request\n"); | |
1252 | raise_exception(fsg, FSG_STATE_RESET); | |
1253 | return; | |
1254 | } | |
1255 | ||
1256 | VDBG(fsg, "CB[I] accept device-specific command\n"); | |
1257 | spin_lock(&fsg->lock); | |
1258 | ||
1259 | /* Save the command for later */ | |
1260 | if (fsg->cbbuf_cmnd_size) | |
b6c63937 | 1261 | WARNING(fsg, "CB[I] overwriting previous command\n"); |
1da177e4 LT |
1262 | fsg->cbbuf_cmnd_size = req->actual; |
1263 | memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size); | |
1264 | ||
1da177e4 | 1265 | wakeup_thread(fsg); |
a21d4fed | 1266 | spin_unlock(&fsg->lock); |
1da177e4 LT |
1267 | } |
1268 | ||
1269 | #else | |
1270 | static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1271 | {} | |
1272 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
1273 | ||
1274 | ||
1275 | static int class_setup_req(struct fsg_dev *fsg, | |
1276 | const struct usb_ctrlrequest *ctrl) | |
1277 | { | |
1278 | struct usb_request *req = fsg->ep0req; | |
1279 | int value = -EOPNOTSUPP; | |
1bbc1696 | 1280 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
88e45dbb | 1281 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1bbc1696 | 1282 | u16 w_length = le16_to_cpu(ctrl->wLength); |
1da177e4 LT |
1283 | |
1284 | if (!fsg->config) | |
1285 | return value; | |
1286 | ||
1287 | /* Handle Bulk-only class-specific requests */ | |
1288 | if (transport_is_bbb()) { | |
1289 | switch (ctrl->bRequest) { | |
1290 | ||
1291 | case USB_BULK_RESET_REQUEST: | |
1292 | if (ctrl->bRequestType != (USB_DIR_OUT | | |
1293 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
1294 | break; | |
88e45dbb | 1295 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
1296 | value = -EDOM; |
1297 | break; | |
1298 | } | |
1299 | ||
1300 | /* Raise an exception to stop the current operation | |
1301 | * and reinitialize our state. */ | |
1302 | DBG(fsg, "bulk reset request\n"); | |
1303 | raise_exception(fsg, FSG_STATE_RESET); | |
1304 | value = DELAYED_STATUS; | |
1305 | break; | |
1306 | ||
1307 | case USB_BULK_GET_MAX_LUN_REQUEST: | |
1308 | if (ctrl->bRequestType != (USB_DIR_IN | | |
1309 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
1310 | break; | |
88e45dbb | 1311 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
1312 | value = -EDOM; |
1313 | break; | |
1314 | } | |
1315 | VDBG(fsg, "get max LUN\n"); | |
1316 | *(u8 *) req->buf = fsg->nluns - 1; | |
76f4af8e | 1317 | value = 1; |
1da177e4 LT |
1318 | break; |
1319 | } | |
1320 | } | |
1321 | ||
1322 | /* Handle CBI class-specific requests */ | |
1323 | else { | |
1324 | switch (ctrl->bRequest) { | |
1325 | ||
1326 | case USB_CBI_ADSC_REQUEST: | |
1327 | if (ctrl->bRequestType != (USB_DIR_OUT | | |
1328 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
1329 | break; | |
88e45dbb | 1330 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
1331 | value = -EDOM; |
1332 | break; | |
1333 | } | |
1334 | if (w_length > MAX_COMMAND_SIZE) { | |
1335 | value = -EOVERFLOW; | |
1336 | break; | |
1337 | } | |
1338 | value = w_length; | |
1339 | fsg->ep0req->context = received_cbi_adsc; | |
1340 | break; | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | if (value == -EOPNOTSUPP) | |
1345 | VDBG(fsg, | |
1346 | "unknown class-specific control req " | |
1347 | "%02x.%02x v%04x i%04x l%u\n", | |
1348 | ctrl->bRequestType, ctrl->bRequest, | |
1bbc1696 | 1349 | le16_to_cpu(ctrl->wValue), w_index, w_length); |
1da177e4 LT |
1350 | return value; |
1351 | } | |
1352 | ||
1353 | ||
1354 | /*-------------------------------------------------------------------------*/ | |
1355 | ||
1356 | /* Ep0 standard request handlers. These always run in_irq. */ | |
1357 | ||
1358 | static int standard_setup_req(struct fsg_dev *fsg, | |
1359 | const struct usb_ctrlrequest *ctrl) | |
1360 | { | |
1361 | struct usb_request *req = fsg->ep0req; | |
1362 | int value = -EOPNOTSUPP; | |
1bbc1696 DB |
1363 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
1364 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
1da177e4 LT |
1365 | |
1366 | /* Usually this just stores reply data in the pre-allocated ep0 buffer, | |
1367 | * but config change events will also reconfigure hardware. */ | |
1368 | switch (ctrl->bRequest) { | |
1369 | ||
1370 | case USB_REQ_GET_DESCRIPTOR: | |
1371 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
1372 | USB_RECIP_DEVICE)) | |
1373 | break; | |
1374 | switch (w_value >> 8) { | |
1375 | ||
1376 | case USB_DT_DEVICE: | |
1377 | VDBG(fsg, "get device descriptor\n"); | |
76f4af8e | 1378 | value = sizeof device_desc; |
1da177e4 LT |
1379 | memcpy(req->buf, &device_desc, value); |
1380 | break; | |
1da177e4 LT |
1381 | case USB_DT_DEVICE_QUALIFIER: |
1382 | VDBG(fsg, "get device qualifier\n"); | |
2e806f67 | 1383 | if (!gadget_is_dualspeed(fsg->gadget)) |
1da177e4 | 1384 | break; |
76f4af8e | 1385 | value = sizeof dev_qualifier; |
1da177e4 LT |
1386 | memcpy(req->buf, &dev_qualifier, value); |
1387 | break; | |
1388 | ||
1389 | case USB_DT_OTHER_SPEED_CONFIG: | |
1390 | VDBG(fsg, "get other-speed config descriptor\n"); | |
2e806f67 | 1391 | if (!gadget_is_dualspeed(fsg->gadget)) |
1da177e4 LT |
1392 | break; |
1393 | goto get_config; | |
1da177e4 LT |
1394 | case USB_DT_CONFIG: |
1395 | VDBG(fsg, "get configuration descriptor\n"); | |
2e806f67 | 1396 | get_config: |
1da177e4 LT |
1397 | value = populate_config_buf(fsg->gadget, |
1398 | req->buf, | |
1399 | w_value >> 8, | |
1400 | w_value & 0xff); | |
1da177e4 LT |
1401 | break; |
1402 | ||
1403 | case USB_DT_STRING: | |
1404 | VDBG(fsg, "get string descriptor\n"); | |
1405 | ||
1406 | /* wIndex == language code */ | |
1407 | value = usb_gadget_get_string(&stringtab, | |
1408 | w_value & 0xff, req->buf); | |
1da177e4 LT |
1409 | break; |
1410 | } | |
1411 | break; | |
1412 | ||
1413 | /* One config, two speeds */ | |
1414 | case USB_REQ_SET_CONFIGURATION: | |
1415 | if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD | | |
1416 | USB_RECIP_DEVICE)) | |
1417 | break; | |
1418 | VDBG(fsg, "set configuration\n"); | |
1419 | if (w_value == CONFIG_VALUE || w_value == 0) { | |
1420 | fsg->new_config = w_value; | |
1421 | ||
1422 | /* Raise an exception to wipe out previous transaction | |
1423 | * state (queued bufs, etc) and set the new config. */ | |
1424 | raise_exception(fsg, FSG_STATE_CONFIG_CHANGE); | |
1425 | value = DELAYED_STATUS; | |
1426 | } | |
1427 | break; | |
1428 | case USB_REQ_GET_CONFIGURATION: | |
1429 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
1430 | USB_RECIP_DEVICE)) | |
1431 | break; | |
1432 | VDBG(fsg, "get configuration\n"); | |
1433 | *(u8 *) req->buf = fsg->config; | |
76f4af8e | 1434 | value = 1; |
1da177e4 LT |
1435 | break; |
1436 | ||
1437 | case USB_REQ_SET_INTERFACE: | |
1438 | if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD | | |
1439 | USB_RECIP_INTERFACE)) | |
1440 | break; | |
1441 | if (fsg->config && w_index == 0) { | |
1442 | ||
1443 | /* Raise an exception to wipe out previous transaction | |
1444 | * state (queued bufs, etc) and install the new | |
1445 | * interface altsetting. */ | |
1446 | raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE); | |
1447 | value = DELAYED_STATUS; | |
1448 | } | |
1449 | break; | |
1450 | case USB_REQ_GET_INTERFACE: | |
1451 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
1452 | USB_RECIP_INTERFACE)) | |
1453 | break; | |
1454 | if (!fsg->config) | |
1455 | break; | |
1456 | if (w_index != 0) { | |
1457 | value = -EDOM; | |
1458 | break; | |
1459 | } | |
1460 | VDBG(fsg, "get interface\n"); | |
1461 | *(u8 *) req->buf = 0; | |
76f4af8e | 1462 | value = 1; |
1da177e4 LT |
1463 | break; |
1464 | ||
1465 | default: | |
1466 | VDBG(fsg, | |
1467 | "unknown control req %02x.%02x v%04x i%04x l%u\n", | |
1468 | ctrl->bRequestType, ctrl->bRequest, | |
1bbc1696 | 1469 | w_value, w_index, le16_to_cpu(ctrl->wLength)); |
1da177e4 LT |
1470 | } |
1471 | ||
1472 | return value; | |
1473 | } | |
1474 | ||
1475 | ||
1476 | static int fsg_setup(struct usb_gadget *gadget, | |
1477 | const struct usb_ctrlrequest *ctrl) | |
1478 | { | |
1479 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
1480 | int rc; | |
1bbc1696 | 1481 | int w_length = le16_to_cpu(ctrl->wLength); |
1da177e4 LT |
1482 | |
1483 | ++fsg->ep0_req_tag; // Record arrival of a new request | |
1484 | fsg->ep0req->context = NULL; | |
1485 | fsg->ep0req->length = 0; | |
1486 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); | |
1487 | ||
1488 | if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) | |
1489 | rc = class_setup_req(fsg, ctrl); | |
1490 | else | |
1491 | rc = standard_setup_req(fsg, ctrl); | |
1492 | ||
1493 | /* Respond with data/status or defer until later? */ | |
1494 | if (rc >= 0 && rc != DELAYED_STATUS) { | |
76f4af8e | 1495 | rc = min(rc, w_length); |
1da177e4 | 1496 | fsg->ep0req->length = rc; |
1bbc1696 | 1497 | fsg->ep0req->zero = rc < w_length; |
1da177e4 LT |
1498 | fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ? |
1499 | "ep0-in" : "ep0-out"); | |
1500 | rc = ep0_queue(fsg); | |
1501 | } | |
1502 | ||
1503 | /* Device either stalls (rc < 0) or reports success */ | |
1504 | return rc; | |
1505 | } | |
1506 | ||
1507 | ||
1508 | /*-------------------------------------------------------------------------*/ | |
1509 | ||
1510 | /* All the following routines run in process context */ | |
1511 | ||
1512 | ||
1513 | /* Use this for bulk or interrupt transfers, not ep0 */ | |
1514 | static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, | |
a21d4fed AS |
1515 | struct usb_request *req, int *pbusy, |
1516 | enum fsg_buffer_state *state) | |
1da177e4 LT |
1517 | { |
1518 | int rc; | |
1519 | ||
1520 | if (ep == fsg->bulk_in) | |
1521 | dump_msg(fsg, "bulk-in", req->buf, req->length); | |
1522 | else if (ep == fsg->intr_in) | |
1523 | dump_msg(fsg, "intr-in", req->buf, req->length); | |
a21d4fed AS |
1524 | |
1525 | spin_lock_irq(&fsg->lock); | |
1da177e4 LT |
1526 | *pbusy = 1; |
1527 | *state = BUF_STATE_BUSY; | |
a21d4fed | 1528 | spin_unlock_irq(&fsg->lock); |
1da177e4 LT |
1529 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
1530 | if (rc != 0) { | |
1531 | *pbusy = 0; | |
1532 | *state = BUF_STATE_EMPTY; | |
1533 | ||
1534 | /* We can't do much more than wait for a reset */ | |
1535 | ||
1536 | /* Note: currently the net2280 driver fails zero-length | |
1537 | * submissions if DMA is enabled. */ | |
1538 | if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP && | |
1539 | req->length == 0)) | |
b6c63937 | 1540 | WARNING(fsg, "error in submission: %s --> %d\n", |
1da177e4 LT |
1541 | ep->name, rc); |
1542 | } | |
1543 | } | |
1544 | ||
1545 | ||
1546 | static int sleep_thread(struct fsg_dev *fsg) | |
1547 | { | |
a21d4fed | 1548 | int rc = 0; |
1da177e4 LT |
1549 | |
1550 | /* Wait until a signal arrives or we are woken up */ | |
a21d4fed AS |
1551 | for (;;) { |
1552 | try_to_freeze(); | |
1553 | set_current_state(TASK_INTERRUPTIBLE); | |
1554 | if (signal_pending(current)) { | |
1555 | rc = -EINTR; | |
1556 | break; | |
1557 | } | |
1558 | if (fsg->thread_wakeup_needed) | |
1559 | break; | |
1560 | schedule(); | |
1561 | } | |
1562 | __set_current_state(TASK_RUNNING); | |
1da177e4 | 1563 | fsg->thread_wakeup_needed = 0; |
a21d4fed | 1564 | return rc; |
1da177e4 LT |
1565 | } |
1566 | ||
1567 | ||
1568 | /*-------------------------------------------------------------------------*/ | |
1569 | ||
1570 | static int do_read(struct fsg_dev *fsg) | |
1571 | { | |
1572 | struct lun *curlun = fsg->curlun; | |
1573 | u32 lba; | |
1574 | struct fsg_buffhd *bh; | |
1575 | int rc; | |
1576 | u32 amount_left; | |
1577 | loff_t file_offset, file_offset_tmp; | |
1578 | unsigned int amount; | |
1579 | unsigned int partial_page; | |
1580 | ssize_t nread; | |
1581 | ||
1582 | /* Get the starting Logical Block Address and check that it's | |
1583 | * not too big */ | |
1584 | if (fsg->cmnd[0] == SC_READ_6) | |
1585 | lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]); | |
1586 | else { | |
1587 | lba = get_be32(&fsg->cmnd[2]); | |
1588 | ||
1589 | /* We allow DPO (Disable Page Out = don't save data in the | |
1590 | * cache) and FUA (Force Unit Access = don't read from the | |
1591 | * cache), but we don't implement them. */ | |
1592 | if ((fsg->cmnd[1] & ~0x18) != 0) { | |
1593 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1594 | return -EINVAL; | |
1595 | } | |
1596 | } | |
1597 | if (lba >= curlun->num_sectors) { | |
1598 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | file_offset = ((loff_t) lba) << 9; | |
1602 | ||
1603 | /* Carry out the file reads */ | |
1604 | amount_left = fsg->data_size_from_cmnd; | |
1605 | if (unlikely(amount_left == 0)) | |
1606 | return -EIO; // No default reply | |
1607 | ||
1608 | for (;;) { | |
1609 | ||
1610 | /* Figure out how much we need to read: | |
1611 | * Try to read the remaining amount. | |
1612 | * But don't read more than the buffer size. | |
1613 | * And don't try to read past the end of the file. | |
1614 | * Finally, if we're not at a page boundary, don't read past | |
1615 | * the next page. | |
1616 | * If this means reading 0 then we were asked to read past | |
1617 | * the end of file. */ | |
1618 | amount = min((unsigned int) amount_left, mod_data.buflen); | |
1619 | amount = min((loff_t) amount, | |
1620 | curlun->file_length - file_offset); | |
1621 | partial_page = file_offset & (PAGE_CACHE_SIZE - 1); | |
1622 | if (partial_page > 0) | |
1623 | amount = min(amount, (unsigned int) PAGE_CACHE_SIZE - | |
1624 | partial_page); | |
1625 | ||
1626 | /* Wait for the next buffer to become available */ | |
1627 | bh = fsg->next_buffhd_to_fill; | |
1628 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
1629 | rc = sleep_thread(fsg); |
1630 | if (rc) | |
1da177e4 LT |
1631 | return rc; |
1632 | } | |
1633 | ||
1634 | /* If we were asked to read past the end of file, | |
1635 | * end with an empty buffer. */ | |
1636 | if (amount == 0) { | |
1637 | curlun->sense_data = | |
1638 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1639 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1640 | curlun->info_valid = 1; |
1da177e4 LT |
1641 | bh->inreq->length = 0; |
1642 | bh->state = BUF_STATE_FULL; | |
1643 | break; | |
1644 | } | |
1645 | ||
1646 | /* Perform the read */ | |
1647 | file_offset_tmp = file_offset; | |
1648 | nread = vfs_read(curlun->filp, | |
1649 | (char __user *) bh->buf, | |
1650 | amount, &file_offset_tmp); | |
1651 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1652 | (unsigned long long) file_offset, | |
1653 | (int) nread); | |
1654 | if (signal_pending(current)) | |
1655 | return -EINTR; | |
1656 | ||
1657 | if (nread < 0) { | |
1658 | LDBG(curlun, "error in file read: %d\n", | |
1659 | (int) nread); | |
1660 | nread = 0; | |
1661 | } else if (nread < amount) { | |
1662 | LDBG(curlun, "partial file read: %d/%u\n", | |
1663 | (int) nread, amount); | |
1664 | nread -= (nread & 511); // Round down to a block | |
1665 | } | |
1666 | file_offset += nread; | |
1667 | amount_left -= nread; | |
1668 | fsg->residue -= nread; | |
1669 | bh->inreq->length = nread; | |
1670 | bh->state = BUF_STATE_FULL; | |
1671 | ||
1672 | /* If an error occurred, report it and its position */ | |
1673 | if (nread < amount) { | |
1674 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
1675 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1676 | curlun->info_valid = 1; |
1da177e4 LT |
1677 | break; |
1678 | } | |
1679 | ||
1680 | if (amount_left == 0) | |
1681 | break; // No more left to read | |
1682 | ||
1683 | /* Send this buffer and go read some more */ | |
1684 | bh->inreq->zero = 0; | |
1685 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
1686 | &bh->inreq_busy, &bh->state); | |
1687 | fsg->next_buffhd_to_fill = bh->next; | |
1688 | } | |
1689 | ||
1690 | return -EIO; // No default reply | |
1691 | } | |
1692 | ||
1693 | ||
1694 | /*-------------------------------------------------------------------------*/ | |
1695 | ||
1696 | static int do_write(struct fsg_dev *fsg) | |
1697 | { | |
1698 | struct lun *curlun = fsg->curlun; | |
1699 | u32 lba; | |
1700 | struct fsg_buffhd *bh; | |
1701 | int get_some_more; | |
1702 | u32 amount_left_to_req, amount_left_to_write; | |
1703 | loff_t usb_offset, file_offset, file_offset_tmp; | |
1704 | unsigned int amount; | |
1705 | unsigned int partial_page; | |
1706 | ssize_t nwritten; | |
1707 | int rc; | |
1708 | ||
1709 | if (curlun->ro) { | |
1710 | curlun->sense_data = SS_WRITE_PROTECTED; | |
1711 | return -EINVAL; | |
1712 | } | |
db1dd4d3 | 1713 | spin_lock(&curlun->filp->f_lock); |
1da177e4 | 1714 | curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait |
db1dd4d3 | 1715 | spin_unlock(&curlun->filp->f_lock); |
1da177e4 LT |
1716 | |
1717 | /* Get the starting Logical Block Address and check that it's | |
1718 | * not too big */ | |
1719 | if (fsg->cmnd[0] == SC_WRITE_6) | |
1720 | lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]); | |
1721 | else { | |
1722 | lba = get_be32(&fsg->cmnd[2]); | |
1723 | ||
1724 | /* We allow DPO (Disable Page Out = don't save data in the | |
1725 | * cache) and FUA (Force Unit Access = write directly to the | |
1726 | * medium). We don't implement DPO; we implement FUA by | |
1727 | * performing synchronous output. */ | |
1728 | if ((fsg->cmnd[1] & ~0x18) != 0) { | |
1729 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1730 | return -EINVAL; | |
1731 | } | |
db1dd4d3 JC |
1732 | if (fsg->cmnd[1] & 0x08) { // FUA |
1733 | spin_lock(&curlun->filp->f_lock); | |
1da177e4 | 1734 | curlun->filp->f_flags |= O_SYNC; |
db1dd4d3 JC |
1735 | spin_unlock(&curlun->filp->f_lock); |
1736 | } | |
1da177e4 LT |
1737 | } |
1738 | if (lba >= curlun->num_sectors) { | |
1739 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1740 | return -EINVAL; | |
1741 | } | |
1742 | ||
1743 | /* Carry out the file writes */ | |
1744 | get_some_more = 1; | |
1745 | file_offset = usb_offset = ((loff_t) lba) << 9; | |
1746 | amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd; | |
1747 | ||
1748 | while (amount_left_to_write > 0) { | |
1749 | ||
1750 | /* Queue a request for more data from the host */ | |
1751 | bh = fsg->next_buffhd_to_fill; | |
1752 | if (bh->state == BUF_STATE_EMPTY && get_some_more) { | |
1753 | ||
1754 | /* Figure out how much we want to get: | |
1755 | * Try to get the remaining amount. | |
1756 | * But don't get more than the buffer size. | |
1757 | * And don't try to go past the end of the file. | |
1758 | * If we're not at a page boundary, | |
1759 | * don't go past the next page. | |
1760 | * If this means getting 0, then we were asked | |
1761 | * to write past the end of file. | |
1762 | * Finally, round down to a block boundary. */ | |
1763 | amount = min(amount_left_to_req, mod_data.buflen); | |
1764 | amount = min((loff_t) amount, curlun->file_length - | |
1765 | usb_offset); | |
1766 | partial_page = usb_offset & (PAGE_CACHE_SIZE - 1); | |
1767 | if (partial_page > 0) | |
1768 | amount = min(amount, | |
1769 | (unsigned int) PAGE_CACHE_SIZE - partial_page); | |
1770 | ||
1771 | if (amount == 0) { | |
1772 | get_some_more = 0; | |
1773 | curlun->sense_data = | |
1774 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1775 | curlun->sense_data_info = usb_offset >> 9; | |
6174d0fd | 1776 | curlun->info_valid = 1; |
1da177e4 LT |
1777 | continue; |
1778 | } | |
1779 | amount -= (amount & 511); | |
1780 | if (amount == 0) { | |
1781 | ||
1782 | /* Why were we were asked to transfer a | |
1783 | * partial block? */ | |
1784 | get_some_more = 0; | |
1785 | continue; | |
1786 | } | |
1787 | ||
1788 | /* Get the next buffer */ | |
1789 | usb_offset += amount; | |
1790 | fsg->usb_amount_left -= amount; | |
1791 | amount_left_to_req -= amount; | |
1792 | if (amount_left_to_req == 0) | |
1793 | get_some_more = 0; | |
1794 | ||
1795 | /* amount is always divisible by 512, hence by | |
1796 | * the bulk-out maxpacket size */ | |
1797 | bh->outreq->length = bh->bulk_out_intended_length = | |
1798 | amount; | |
70ffe6e1 | 1799 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
1800 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
1801 | &bh->outreq_busy, &bh->state); | |
1802 | fsg->next_buffhd_to_fill = bh->next; | |
1803 | continue; | |
1804 | } | |
1805 | ||
1806 | /* Write the received data to the backing file */ | |
1807 | bh = fsg->next_buffhd_to_drain; | |
1808 | if (bh->state == BUF_STATE_EMPTY && !get_some_more) | |
1809 | break; // We stopped early | |
1810 | if (bh->state == BUF_STATE_FULL) { | |
a21d4fed | 1811 | smp_rmb(); |
1da177e4 LT |
1812 | fsg->next_buffhd_to_drain = bh->next; |
1813 | bh->state = BUF_STATE_EMPTY; | |
1814 | ||
1815 | /* Did something go wrong with the transfer? */ | |
1816 | if (bh->outreq->status != 0) { | |
1817 | curlun->sense_data = SS_COMMUNICATION_FAILURE; | |
1818 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1819 | curlun->info_valid = 1; |
1da177e4 LT |
1820 | break; |
1821 | } | |
1822 | ||
1823 | amount = bh->outreq->actual; | |
1824 | if (curlun->file_length - file_offset < amount) { | |
1825 | LERROR(curlun, | |
1826 | "write %u @ %llu beyond end %llu\n", | |
1827 | amount, (unsigned long long) file_offset, | |
1828 | (unsigned long long) curlun->file_length); | |
1829 | amount = curlun->file_length - file_offset; | |
1830 | } | |
1831 | ||
1832 | /* Perform the write */ | |
1833 | file_offset_tmp = file_offset; | |
1834 | nwritten = vfs_write(curlun->filp, | |
1835 | (char __user *) bh->buf, | |
1836 | amount, &file_offset_tmp); | |
1837 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, | |
1838 | (unsigned long long) file_offset, | |
1839 | (int) nwritten); | |
1840 | if (signal_pending(current)) | |
1841 | return -EINTR; // Interrupted! | |
1842 | ||
1843 | if (nwritten < 0) { | |
1844 | LDBG(curlun, "error in file write: %d\n", | |
1845 | (int) nwritten); | |
1846 | nwritten = 0; | |
1847 | } else if (nwritten < amount) { | |
1848 | LDBG(curlun, "partial file write: %d/%u\n", | |
1849 | (int) nwritten, amount); | |
1850 | nwritten -= (nwritten & 511); | |
1851 | // Round down to a block | |
1852 | } | |
1853 | file_offset += nwritten; | |
1854 | amount_left_to_write -= nwritten; | |
1855 | fsg->residue -= nwritten; | |
1856 | ||
1857 | /* If an error occurred, report it and its position */ | |
1858 | if (nwritten < amount) { | |
1859 | curlun->sense_data = SS_WRITE_ERROR; | |
1860 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1861 | curlun->info_valid = 1; |
1da177e4 LT |
1862 | break; |
1863 | } | |
1864 | ||
1865 | /* Did the host decide to stop early? */ | |
1866 | if (bh->outreq->actual != bh->outreq->length) { | |
1867 | fsg->short_packet_received = 1; | |
1868 | break; | |
1869 | } | |
1870 | continue; | |
1871 | } | |
1872 | ||
1873 | /* Wait for something to happen */ | |
79a7d9ee AS |
1874 | rc = sleep_thread(fsg); |
1875 | if (rc) | |
1da177e4 LT |
1876 | return rc; |
1877 | } | |
1878 | ||
1879 | return -EIO; // No default reply | |
1880 | } | |
1881 | ||
1882 | ||
1883 | /*-------------------------------------------------------------------------*/ | |
1884 | ||
1885 | /* Sync the file data, don't bother with the metadata. | |
1886 | * This code was copied from fs/buffer.c:sys_fdatasync(). */ | |
1887 | static int fsync_sub(struct lun *curlun) | |
1888 | { | |
1889 | struct file *filp = curlun->filp; | |
1da177e4 LT |
1890 | |
1891 | if (curlun->ro || !filp) | |
1892 | return 0; | |
4c728ef5 | 1893 | return vfs_fsync(filp, filp->f_path.dentry, 1); |
1da177e4 LT |
1894 | } |
1895 | ||
1896 | static void fsync_all(struct fsg_dev *fsg) | |
1897 | { | |
1898 | int i; | |
1899 | ||
1900 | for (i = 0; i < fsg->nluns; ++i) | |
1901 | fsync_sub(&fsg->luns[i]); | |
1902 | } | |
1903 | ||
1904 | static int do_synchronize_cache(struct fsg_dev *fsg) | |
1905 | { | |
1906 | struct lun *curlun = fsg->curlun; | |
1907 | int rc; | |
1908 | ||
1909 | /* We ignore the requested LBA and write out all file's | |
1910 | * dirty data buffers. */ | |
1911 | rc = fsync_sub(curlun); | |
1912 | if (rc) | |
1913 | curlun->sense_data = SS_WRITE_ERROR; | |
1914 | return 0; | |
1915 | } | |
1916 | ||
1917 | ||
1918 | /*-------------------------------------------------------------------------*/ | |
1919 | ||
1920 | static void invalidate_sub(struct lun *curlun) | |
1921 | { | |
1922 | struct file *filp = curlun->filp; | |
33cb8994 | 1923 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
1924 | unsigned long rc; |
1925 | ||
fc0ecff6 | 1926 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
1927 | VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc); |
1928 | } | |
1929 | ||
1930 | static int do_verify(struct fsg_dev *fsg) | |
1931 | { | |
1932 | struct lun *curlun = fsg->curlun; | |
1933 | u32 lba; | |
1934 | u32 verification_length; | |
1935 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
1936 | loff_t file_offset, file_offset_tmp; | |
1937 | u32 amount_left; | |
1938 | unsigned int amount; | |
1939 | ssize_t nread; | |
1940 | ||
1941 | /* Get the starting Logical Block Address and check that it's | |
1942 | * not too big */ | |
1943 | lba = get_be32(&fsg->cmnd[2]); | |
1944 | if (lba >= curlun->num_sectors) { | |
1945 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1946 | return -EINVAL; | |
1947 | } | |
1948 | ||
1949 | /* We allow DPO (Disable Page Out = don't save data in the | |
1950 | * cache) but we don't implement it. */ | |
1951 | if ((fsg->cmnd[1] & ~0x10) != 0) { | |
1952 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1953 | return -EINVAL; | |
1954 | } | |
1955 | ||
1956 | verification_length = get_be16(&fsg->cmnd[7]); | |
1957 | if (unlikely(verification_length == 0)) | |
1958 | return -EIO; // No default reply | |
1959 | ||
1960 | /* Prepare to carry out the file verify */ | |
1961 | amount_left = verification_length << 9; | |
1962 | file_offset = ((loff_t) lba) << 9; | |
1963 | ||
1964 | /* Write out all the dirty buffers before invalidating them */ | |
1965 | fsync_sub(curlun); | |
1966 | if (signal_pending(current)) | |
1967 | return -EINTR; | |
1968 | ||
1969 | invalidate_sub(curlun); | |
1970 | if (signal_pending(current)) | |
1971 | return -EINTR; | |
1972 | ||
1973 | /* Just try to read the requested blocks */ | |
1974 | while (amount_left > 0) { | |
1975 | ||
1976 | /* Figure out how much we need to read: | |
1977 | * Try to read the remaining amount, but not more than | |
1978 | * the buffer size. | |
1979 | * And don't try to read past the end of the file. | |
1980 | * If this means reading 0 then we were asked to read | |
1981 | * past the end of file. */ | |
1982 | amount = min((unsigned int) amount_left, mod_data.buflen); | |
1983 | amount = min((loff_t) amount, | |
1984 | curlun->file_length - file_offset); | |
1985 | if (amount == 0) { | |
1986 | curlun->sense_data = | |
1987 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1988 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1989 | curlun->info_valid = 1; |
1da177e4 LT |
1990 | break; |
1991 | } | |
1992 | ||
1993 | /* Perform the read */ | |
1994 | file_offset_tmp = file_offset; | |
1995 | nread = vfs_read(curlun->filp, | |
1996 | (char __user *) bh->buf, | |
1997 | amount, &file_offset_tmp); | |
1998 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1999 | (unsigned long long) file_offset, | |
2000 | (int) nread); | |
2001 | if (signal_pending(current)) | |
2002 | return -EINTR; | |
2003 | ||
2004 | if (nread < 0) { | |
2005 | LDBG(curlun, "error in file verify: %d\n", | |
2006 | (int) nread); | |
2007 | nread = 0; | |
2008 | } else if (nread < amount) { | |
2009 | LDBG(curlun, "partial file verify: %d/%u\n", | |
2010 | (int) nread, amount); | |
2011 | nread -= (nread & 511); // Round down to a sector | |
2012 | } | |
2013 | if (nread == 0) { | |
2014 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
2015 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 2016 | curlun->info_valid = 1; |
1da177e4 LT |
2017 | break; |
2018 | } | |
2019 | file_offset += nread; | |
2020 | amount_left -= nread; | |
2021 | } | |
2022 | return 0; | |
2023 | } | |
2024 | ||
2025 | ||
2026 | /*-------------------------------------------------------------------------*/ | |
2027 | ||
2028 | static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2029 | { | |
2030 | u8 *buf = (u8 *) bh->buf; | |
2031 | ||
2032 | static char vendor_id[] = "Linux "; | |
12aae68a AS |
2033 | static char product_disk_id[] = "File-Stor Gadget"; |
2034 | static char product_cdrom_id[] = "File-CD Gadget "; | |
1da177e4 LT |
2035 | |
2036 | if (!fsg->curlun) { // Unsupported LUNs are okay | |
2037 | fsg->bad_lun_okay = 1; | |
2038 | memset(buf, 0, 36); | |
2039 | buf[0] = 0x7f; // Unsupported, no device-type | |
12aae68a | 2040 | buf[4] = 31; // Additional length |
1da177e4 LT |
2041 | return 36; |
2042 | } | |
2043 | ||
12aae68a AS |
2044 | memset(buf, 0, 8); |
2045 | buf[0] = (mod_data.cdrom ? TYPE_CDROM : TYPE_DISK); | |
1da177e4 LT |
2046 | if (mod_data.removable) |
2047 | buf[1] = 0x80; | |
2048 | buf[2] = 2; // ANSI SCSI level 2 | |
2049 | buf[3] = 2; // SCSI-2 INQUIRY data format | |
2050 | buf[4] = 31; // Additional length | |
2051 | // No special options | |
12aae68a AS |
2052 | sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, |
2053 | (mod_data.cdrom ? product_cdrom_id : | |
2054 | product_disk_id), | |
1da177e4 LT |
2055 | mod_data.release); |
2056 | return 36; | |
2057 | } | |
2058 | ||
2059 | ||
2060 | static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2061 | { | |
2062 | struct lun *curlun = fsg->curlun; | |
2063 | u8 *buf = (u8 *) bh->buf; | |
2064 | u32 sd, sdinfo; | |
6174d0fd | 2065 | int valid; |
1da177e4 LT |
2066 | |
2067 | /* | |
2068 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): | |
2069 | * | |
2070 | * If a REQUEST SENSE command is received from an initiator | |
2071 | * with a pending unit attention condition (before the target | |
2072 | * generates the contingent allegiance condition), then the | |
2073 | * target shall either: | |
2074 | * a) report any pending sense data and preserve the unit | |
2075 | * attention condition on the logical unit, or, | |
2076 | * b) report the unit attention condition, may discard any | |
2077 | * pending sense data, and clear the unit attention | |
2078 | * condition on the logical unit for that initiator. | |
2079 | * | |
2080 | * FSG normally uses option a); enable this code to use option b). | |
2081 | */ | |
2082 | #if 0 | |
2083 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { | |
2084 | curlun->sense_data = curlun->unit_attention_data; | |
2085 | curlun->unit_attention_data = SS_NO_SENSE; | |
2086 | } | |
2087 | #endif | |
2088 | ||
2089 | if (!curlun) { // Unsupported LUNs are okay | |
2090 | fsg->bad_lun_okay = 1; | |
2091 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
2092 | sdinfo = 0; | |
6174d0fd | 2093 | valid = 0; |
1da177e4 LT |
2094 | } else { |
2095 | sd = curlun->sense_data; | |
2096 | sdinfo = curlun->sense_data_info; | |
6174d0fd | 2097 | valid = curlun->info_valid << 7; |
1da177e4 LT |
2098 | curlun->sense_data = SS_NO_SENSE; |
2099 | curlun->sense_data_info = 0; | |
6174d0fd | 2100 | curlun->info_valid = 0; |
1da177e4 LT |
2101 | } |
2102 | ||
2103 | memset(buf, 0, 18); | |
6174d0fd | 2104 | buf[0] = valid | 0x70; // Valid, current error |
1da177e4 LT |
2105 | buf[2] = SK(sd); |
2106 | put_be32(&buf[3], sdinfo); // Sense information | |
2107 | buf[7] = 18 - 8; // Additional sense length | |
2108 | buf[12] = ASC(sd); | |
2109 | buf[13] = ASCQ(sd); | |
2110 | return 18; | |
2111 | } | |
2112 | ||
2113 | ||
2114 | static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2115 | { | |
2116 | struct lun *curlun = fsg->curlun; | |
2117 | u32 lba = get_be32(&fsg->cmnd[2]); | |
2118 | int pmi = fsg->cmnd[8]; | |
2119 | u8 *buf = (u8 *) bh->buf; | |
2120 | ||
2121 | /* Check the PMI and LBA fields */ | |
2122 | if (pmi > 1 || (pmi == 0 && lba != 0)) { | |
2123 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2124 | return -EINVAL; | |
2125 | } | |
2126 | ||
2127 | put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block | |
2128 | put_be32(&buf[4], 512); // Block length | |
2129 | return 8; | |
2130 | } | |
2131 | ||
2132 | ||
12aae68a AS |
2133 | static void store_cdrom_address(u8 *dest, int msf, u32 addr) |
2134 | { | |
2135 | if (msf) { | |
2136 | /* Convert to Minutes-Seconds-Frames */ | |
2137 | addr >>= 2; /* Convert to 2048-byte frames */ | |
2138 | addr += 2*75; /* Lead-in occupies 2 seconds */ | |
2139 | dest[3] = addr % 75; /* Frames */ | |
2140 | addr /= 75; | |
2141 | dest[2] = addr % 60; /* Seconds */ | |
2142 | addr /= 60; | |
2143 | dest[1] = addr; /* Minutes */ | |
2144 | dest[0] = 0; /* Reserved */ | |
2145 | } else { | |
2146 | /* Absolute sector */ | |
2147 | put_be32(dest, addr); | |
2148 | } | |
2149 | } | |
2150 | ||
2151 | static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2152 | { | |
2153 | struct lun *curlun = fsg->curlun; | |
2154 | int msf = fsg->cmnd[1] & 0x02; | |
2155 | u32 lba = get_be32(&fsg->cmnd[2]); | |
2156 | u8 *buf = (u8 *) bh->buf; | |
2157 | ||
2158 | if ((fsg->cmnd[1] & ~0x02) != 0) { /* Mask away MSF */ | |
2159 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2160 | return -EINVAL; | |
2161 | } | |
2162 | if (lba >= curlun->num_sectors) { | |
2163 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
2164 | return -EINVAL; | |
2165 | } | |
2166 | ||
2167 | memset(buf, 0, 8); | |
2168 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ | |
2169 | store_cdrom_address(&buf[4], msf, lba); | |
2170 | return 8; | |
2171 | } | |
2172 | ||
2173 | ||
2174 | static int do_read_toc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2175 | { | |
2176 | struct lun *curlun = fsg->curlun; | |
2177 | int msf = fsg->cmnd[1] & 0x02; | |
2178 | int start_track = fsg->cmnd[6]; | |
2179 | u8 *buf = (u8 *) bh->buf; | |
2180 | ||
2181 | if ((fsg->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ | |
2182 | start_track > 1) { | |
2183 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2184 | return -EINVAL; | |
2185 | } | |
2186 | ||
2187 | memset(buf, 0, 20); | |
2188 | buf[1] = (20-2); /* TOC data length */ | |
2189 | buf[2] = 1; /* First track number */ | |
2190 | buf[3] = 1; /* Last track number */ | |
2191 | buf[5] = 0x16; /* Data track, copying allowed */ | |
2192 | buf[6] = 0x01; /* Only track is number 1 */ | |
2193 | store_cdrom_address(&buf[8], msf, 0); | |
2194 | ||
2195 | buf[13] = 0x16; /* Lead-out track is data */ | |
2196 | buf[14] = 0xAA; /* Lead-out track number */ | |
2197 | store_cdrom_address(&buf[16], msf, curlun->num_sectors); | |
2198 | return 20; | |
2199 | } | |
2200 | ||
2201 | ||
1da177e4 LT |
2202 | static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
2203 | { | |
2204 | struct lun *curlun = fsg->curlun; | |
2205 | int mscmnd = fsg->cmnd[0]; | |
2206 | u8 *buf = (u8 *) bh->buf; | |
2207 | u8 *buf0 = buf; | |
2208 | int pc, page_code; | |
2209 | int changeable_values, all_pages; | |
2210 | int valid_page = 0; | |
2211 | int len, limit; | |
2212 | ||
2213 | if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD | |
2214 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2215 | return -EINVAL; | |
2216 | } | |
2217 | pc = fsg->cmnd[2] >> 6; | |
2218 | page_code = fsg->cmnd[2] & 0x3f; | |
2219 | if (pc == 3) { | |
2220 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; | |
2221 | return -EINVAL; | |
2222 | } | |
2223 | changeable_values = (pc == 1); | |
2224 | all_pages = (page_code == 0x3f); | |
2225 | ||
2226 | /* Write the mode parameter header. Fixed values are: default | |
2227 | * medium type, no cache control (DPOFUA), and no block descriptors. | |
2228 | * The only variable value is the WriteProtect bit. We will fill in | |
2229 | * the mode data length later. */ | |
2230 | memset(buf, 0, 8); | |
2231 | if (mscmnd == SC_MODE_SENSE_6) { | |
2232 | buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA | |
2233 | buf += 4; | |
2234 | limit = 255; | |
2235 | } else { // SC_MODE_SENSE_10 | |
2236 | buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA | |
2237 | buf += 8; | |
2238 | limit = 65535; // Should really be mod_data.buflen | |
2239 | } | |
2240 | ||
2241 | /* No block descriptors */ | |
2242 | ||
2243 | /* The mode pages, in numerical order. The only page we support | |
2244 | * is the Caching page. */ | |
2245 | if (page_code == 0x08 || all_pages) { | |
2246 | valid_page = 1; | |
2247 | buf[0] = 0x08; // Page code | |
2248 | buf[1] = 10; // Page length | |
2249 | memset(buf+2, 0, 10); // None of the fields are changeable | |
2250 | ||
2251 | if (!changeable_values) { | |
2252 | buf[2] = 0x04; // Write cache enable, | |
2253 | // Read cache not disabled | |
2254 | // No cache retention priorities | |
2255 | put_be16(&buf[4], 0xffff); // Don't disable prefetch | |
2256 | // Minimum prefetch = 0 | |
2257 | put_be16(&buf[8], 0xffff); // Maximum prefetch | |
2258 | put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling | |
2259 | } | |
2260 | buf += 12; | |
2261 | } | |
2262 | ||
2263 | /* Check that a valid page was requested and the mode data length | |
2264 | * isn't too long. */ | |
2265 | len = buf - buf0; | |
2266 | if (!valid_page || len > limit) { | |
2267 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2268 | return -EINVAL; | |
2269 | } | |
2270 | ||
2271 | /* Store the mode data length */ | |
2272 | if (mscmnd == SC_MODE_SENSE_6) | |
2273 | buf0[0] = len - 1; | |
2274 | else | |
2275 | put_be16(buf0, len - 2); | |
2276 | return len; | |
2277 | } | |
2278 | ||
2279 | ||
2280 | static int do_start_stop(struct fsg_dev *fsg) | |
2281 | { | |
2282 | struct lun *curlun = fsg->curlun; | |
2283 | int loej, start; | |
2284 | ||
2285 | if (!mod_data.removable) { | |
2286 | curlun->sense_data = SS_INVALID_COMMAND; | |
2287 | return -EINVAL; | |
2288 | } | |
2289 | ||
2290 | // int immed = fsg->cmnd[1] & 0x01; | |
2291 | loej = fsg->cmnd[4] & 0x02; | |
2292 | start = fsg->cmnd[4] & 0x01; | |
2293 | ||
2294 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
2295 | if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed | |
2296 | (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start | |
2297 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2298 | return -EINVAL; | |
2299 | } | |
2300 | ||
2301 | if (!start) { | |
2302 | ||
2303 | /* Are we allowed to unload the media? */ | |
2304 | if (curlun->prevent_medium_removal) { | |
2305 | LDBG(curlun, "unload attempt prevented\n"); | |
2306 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; | |
2307 | return -EINVAL; | |
2308 | } | |
2309 | if (loej) { // Simulate an unload/eject | |
2310 | up_read(&fsg->filesem); | |
2311 | down_write(&fsg->filesem); | |
2312 | close_backing_file(curlun); | |
2313 | up_write(&fsg->filesem); | |
2314 | down_read(&fsg->filesem); | |
2315 | } | |
2316 | } else { | |
2317 | ||
2318 | /* Our emulation doesn't support mounting; the medium is | |
2319 | * available for use as soon as it is loaded. */ | |
2320 | if (!backing_file_is_open(curlun)) { | |
2321 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
2322 | return -EINVAL; | |
2323 | } | |
2324 | } | |
2325 | #endif | |
2326 | return 0; | |
2327 | } | |
2328 | ||
2329 | ||
2330 | static int do_prevent_allow(struct fsg_dev *fsg) | |
2331 | { | |
2332 | struct lun *curlun = fsg->curlun; | |
2333 | int prevent; | |
2334 | ||
2335 | if (!mod_data.removable) { | |
2336 | curlun->sense_data = SS_INVALID_COMMAND; | |
2337 | return -EINVAL; | |
2338 | } | |
2339 | ||
2340 | prevent = fsg->cmnd[4] & 0x01; | |
2341 | if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent | |
2342 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2343 | return -EINVAL; | |
2344 | } | |
2345 | ||
2346 | if (curlun->prevent_medium_removal && !prevent) | |
2347 | fsync_sub(curlun); | |
2348 | curlun->prevent_medium_removal = prevent; | |
2349 | return 0; | |
2350 | } | |
2351 | ||
2352 | ||
2353 | static int do_read_format_capacities(struct fsg_dev *fsg, | |
2354 | struct fsg_buffhd *bh) | |
2355 | { | |
2356 | struct lun *curlun = fsg->curlun; | |
2357 | u8 *buf = (u8 *) bh->buf; | |
2358 | ||
2359 | buf[0] = buf[1] = buf[2] = 0; | |
2360 | buf[3] = 8; // Only the Current/Maximum Capacity Descriptor | |
2361 | buf += 4; | |
2362 | ||
2363 | put_be32(&buf[0], curlun->num_sectors); // Number of blocks | |
2364 | put_be32(&buf[4], 512); // Block length | |
2365 | buf[4] = 0x02; // Current capacity | |
2366 | return 12; | |
2367 | } | |
2368 | ||
2369 | ||
2370 | static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2371 | { | |
2372 | struct lun *curlun = fsg->curlun; | |
2373 | ||
2374 | /* We don't support MODE SELECT */ | |
2375 | curlun->sense_data = SS_INVALID_COMMAND; | |
2376 | return -EINVAL; | |
2377 | } | |
2378 | ||
2379 | ||
2380 | /*-------------------------------------------------------------------------*/ | |
2381 | ||
2382 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) | |
2383 | { | |
2384 | int rc; | |
2385 | ||
2386 | rc = fsg_set_halt(fsg, fsg->bulk_in); | |
2387 | if (rc == -EAGAIN) | |
2388 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); | |
2389 | while (rc != 0) { | |
2390 | if (rc != -EAGAIN) { | |
b6c63937 | 2391 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); |
1da177e4 LT |
2392 | rc = 0; |
2393 | break; | |
2394 | } | |
2395 | ||
2396 | /* Wait for a short time and then try again */ | |
2397 | if (msleep_interruptible(100) != 0) | |
2398 | return -EINTR; | |
2399 | rc = usb_ep_set_halt(fsg->bulk_in); | |
2400 | } | |
2401 | return rc; | |
2402 | } | |
2403 | ||
62fd2cac DL |
2404 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) |
2405 | { | |
2406 | int rc; | |
2407 | ||
2408 | DBG(fsg, "bulk-in set wedge\n"); | |
2409 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
2410 | if (rc == -EAGAIN) | |
2411 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); | |
2412 | while (rc != 0) { | |
2413 | if (rc != -EAGAIN) { | |
b6c63937 | 2414 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); |
62fd2cac DL |
2415 | rc = 0; |
2416 | break; | |
2417 | } | |
2418 | ||
2419 | /* Wait for a short time and then try again */ | |
2420 | if (msleep_interruptible(100) != 0) | |
2421 | return -EINTR; | |
2422 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
2423 | } | |
2424 | return rc; | |
2425 | } | |
2426 | ||
1da177e4 LT |
2427 | static int pad_with_zeros(struct fsg_dev *fsg) |
2428 | { | |
2429 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
2430 | u32 nkeep = bh->inreq->length; | |
2431 | u32 nsend; | |
2432 | int rc; | |
2433 | ||
2434 | bh->state = BUF_STATE_EMPTY; // For the first iteration | |
2435 | fsg->usb_amount_left = nkeep + fsg->residue; | |
2436 | while (fsg->usb_amount_left > 0) { | |
2437 | ||
2438 | /* Wait for the next buffer to be free */ | |
2439 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2440 | rc = sleep_thread(fsg); |
2441 | if (rc) | |
1da177e4 LT |
2442 | return rc; |
2443 | } | |
2444 | ||
2445 | nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen); | |
2446 | memset(bh->buf + nkeep, 0, nsend - nkeep); | |
2447 | bh->inreq->length = nsend; | |
2448 | bh->inreq->zero = 0; | |
2449 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2450 | &bh->inreq_busy, &bh->state); | |
2451 | bh = fsg->next_buffhd_to_fill = bh->next; | |
2452 | fsg->usb_amount_left -= nsend; | |
2453 | nkeep = 0; | |
2454 | } | |
2455 | return 0; | |
2456 | } | |
2457 | ||
2458 | static int throw_away_data(struct fsg_dev *fsg) | |
2459 | { | |
2460 | struct fsg_buffhd *bh; | |
2461 | u32 amount; | |
2462 | int rc; | |
2463 | ||
2464 | while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY || | |
2465 | fsg->usb_amount_left > 0) { | |
2466 | ||
2467 | /* Throw away the data in a filled buffer */ | |
2468 | if (bh->state == BUF_STATE_FULL) { | |
a21d4fed | 2469 | smp_rmb(); |
1da177e4 LT |
2470 | bh->state = BUF_STATE_EMPTY; |
2471 | fsg->next_buffhd_to_drain = bh->next; | |
2472 | ||
2473 | /* A short packet or an error ends everything */ | |
2474 | if (bh->outreq->actual != bh->outreq->length || | |
2475 | bh->outreq->status != 0) { | |
2476 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2477 | return -EINTR; | |
2478 | } | |
2479 | continue; | |
2480 | } | |
2481 | ||
2482 | /* Try to submit another request if we need one */ | |
2483 | bh = fsg->next_buffhd_to_fill; | |
2484 | if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) { | |
2485 | amount = min(fsg->usb_amount_left, | |
2486 | (u32) mod_data.buflen); | |
2487 | ||
2488 | /* amount is always divisible by 512, hence by | |
2489 | * the bulk-out maxpacket size */ | |
2490 | bh->outreq->length = bh->bulk_out_intended_length = | |
2491 | amount; | |
70ffe6e1 | 2492 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
2493 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
2494 | &bh->outreq_busy, &bh->state); | |
2495 | fsg->next_buffhd_to_fill = bh->next; | |
2496 | fsg->usb_amount_left -= amount; | |
2497 | continue; | |
2498 | } | |
2499 | ||
2500 | /* Otherwise wait for something to happen */ | |
79a7d9ee AS |
2501 | rc = sleep_thread(fsg); |
2502 | if (rc) | |
1da177e4 LT |
2503 | return rc; |
2504 | } | |
2505 | return 0; | |
2506 | } | |
2507 | ||
2508 | ||
2509 | static int finish_reply(struct fsg_dev *fsg) | |
2510 | { | |
2511 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
2512 | int rc = 0; | |
2513 | ||
2514 | switch (fsg->data_dir) { | |
2515 | case DATA_DIR_NONE: | |
2516 | break; // Nothing to send | |
2517 | ||
2518 | /* If we don't know whether the host wants to read or write, | |
2519 | * this must be CB or CBI with an unknown command. We mustn't | |
2520 | * try to send or receive any data. So stall both bulk pipes | |
2521 | * if we can and wait for a reset. */ | |
2522 | case DATA_DIR_UNKNOWN: | |
2523 | if (mod_data.can_stall) { | |
2524 | fsg_set_halt(fsg, fsg->bulk_out); | |
2525 | rc = halt_bulk_in_endpoint(fsg); | |
2526 | } | |
2527 | break; | |
2528 | ||
2529 | /* All but the last buffer of data must have already been sent */ | |
2530 | case DATA_DIR_TO_HOST: | |
2531 | if (fsg->data_size == 0) | |
2532 | ; // Nothing to send | |
2533 | ||
2534 | /* If there's no residue, simply send the last buffer */ | |
2535 | else if (fsg->residue == 0) { | |
2536 | bh->inreq->zero = 0; | |
2537 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2538 | &bh->inreq_busy, &bh->state); | |
2539 | fsg->next_buffhd_to_fill = bh->next; | |
2540 | } | |
2541 | ||
2542 | /* There is a residue. For CB and CBI, simply mark the end | |
2543 | * of the data with a short packet. However, if we are | |
2544 | * allowed to stall, there was no data at all (residue == | |
2545 | * data_size), and the command failed (invalid LUN or | |
2546 | * sense data is set), then halt the bulk-in endpoint | |
2547 | * instead. */ | |
2548 | else if (!transport_is_bbb()) { | |
2549 | if (mod_data.can_stall && | |
2550 | fsg->residue == fsg->data_size && | |
2551 | (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) { | |
2552 | bh->state = BUF_STATE_EMPTY; | |
2553 | rc = halt_bulk_in_endpoint(fsg); | |
2554 | } else { | |
2555 | bh->inreq->zero = 1; | |
2556 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2557 | &bh->inreq_busy, &bh->state); | |
2558 | fsg->next_buffhd_to_fill = bh->next; | |
2559 | } | |
2560 | } | |
2561 | ||
2562 | /* For Bulk-only, if we're allowed to stall then send the | |
2563 | * short packet and halt the bulk-in endpoint. If we can't | |
2564 | * stall, pad out the remaining data with 0's. */ | |
2565 | else { | |
2566 | if (mod_data.can_stall) { | |
2567 | bh->inreq->zero = 1; | |
2568 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2569 | &bh->inreq_busy, &bh->state); | |
2570 | fsg->next_buffhd_to_fill = bh->next; | |
2571 | rc = halt_bulk_in_endpoint(fsg); | |
2572 | } else | |
2573 | rc = pad_with_zeros(fsg); | |
2574 | } | |
2575 | break; | |
2576 | ||
2577 | /* We have processed all we want from the data the host has sent. | |
2578 | * There may still be outstanding bulk-out requests. */ | |
2579 | case DATA_DIR_FROM_HOST: | |
2580 | if (fsg->residue == 0) | |
2581 | ; // Nothing to receive | |
2582 | ||
2583 | /* Did the host stop sending unexpectedly early? */ | |
2584 | else if (fsg->short_packet_received) { | |
2585 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2586 | rc = -EINTR; | |
2587 | } | |
2588 | ||
2589 | /* We haven't processed all the incoming data. Even though | |
2590 | * we may be allowed to stall, doing so would cause a race. | |
2591 | * The controller may already have ACK'ed all the remaining | |
2592 | * bulk-out packets, in which case the host wouldn't see a | |
2593 | * STALL. Not realizing the endpoint was halted, it wouldn't | |
2594 | * clear the halt -- leading to problems later on. */ | |
2595 | #if 0 | |
2596 | else if (mod_data.can_stall) { | |
2597 | fsg_set_halt(fsg, fsg->bulk_out); | |
2598 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2599 | rc = -EINTR; | |
2600 | } | |
2601 | #endif | |
2602 | ||
2603 | /* We can't stall. Read in the excess data and throw it | |
2604 | * all away. */ | |
2605 | else | |
2606 | rc = throw_away_data(fsg); | |
2607 | break; | |
2608 | } | |
2609 | return rc; | |
2610 | } | |
2611 | ||
2612 | ||
2613 | static int send_status(struct fsg_dev *fsg) | |
2614 | { | |
2615 | struct lun *curlun = fsg->curlun; | |
2616 | struct fsg_buffhd *bh; | |
2617 | int rc; | |
2618 | u8 status = USB_STATUS_PASS; | |
2619 | u32 sd, sdinfo = 0; | |
2620 | ||
2621 | /* Wait for the next buffer to become available */ | |
2622 | bh = fsg->next_buffhd_to_fill; | |
2623 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2624 | rc = sleep_thread(fsg); |
2625 | if (rc) | |
1da177e4 LT |
2626 | return rc; |
2627 | } | |
2628 | ||
2629 | if (curlun) { | |
2630 | sd = curlun->sense_data; | |
2631 | sdinfo = curlun->sense_data_info; | |
2632 | } else if (fsg->bad_lun_okay) | |
2633 | sd = SS_NO_SENSE; | |
2634 | else | |
2635 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
2636 | ||
2637 | if (fsg->phase_error) { | |
2638 | DBG(fsg, "sending phase-error status\n"); | |
2639 | status = USB_STATUS_PHASE_ERROR; | |
2640 | sd = SS_INVALID_COMMAND; | |
2641 | } else if (sd != SS_NO_SENSE) { | |
2642 | DBG(fsg, "sending command-failure status\n"); | |
2643 | status = USB_STATUS_FAIL; | |
2644 | VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" | |
2645 | " info x%x\n", | |
2646 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); | |
2647 | } | |
2648 | ||
2649 | if (transport_is_bbb()) { | |
7ca46b86 | 2650 | struct bulk_cs_wrap *csw = bh->buf; |
1da177e4 LT |
2651 | |
2652 | /* Store and send the Bulk-only CSW */ | |
551509d2 | 2653 | csw->Signature = cpu_to_le32(USB_BULK_CS_SIG); |
1da177e4 LT |
2654 | csw->Tag = fsg->tag; |
2655 | csw->Residue = cpu_to_le32(fsg->residue); | |
2656 | csw->Status = status; | |
2657 | ||
2658 | bh->inreq->length = USB_BULK_CS_WRAP_LEN; | |
2659 | bh->inreq->zero = 0; | |
2660 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2661 | &bh->inreq_busy, &bh->state); | |
2662 | ||
2663 | } else if (mod_data.transport_type == USB_PR_CB) { | |
2664 | ||
2665 | /* Control-Bulk transport has no status phase! */ | |
2666 | return 0; | |
2667 | ||
2668 | } else { // USB_PR_CBI | |
7ca46b86 | 2669 | struct interrupt_data *buf = bh->buf; |
1da177e4 LT |
2670 | |
2671 | /* Store and send the Interrupt data. UFI sends the ASC | |
2672 | * and ASCQ bytes. Everything else sends a Type (which | |
2673 | * is always 0) and the status Value. */ | |
2674 | if (mod_data.protocol_type == USB_SC_UFI) { | |
2675 | buf->bType = ASC(sd); | |
2676 | buf->bValue = ASCQ(sd); | |
2677 | } else { | |
2678 | buf->bType = 0; | |
2679 | buf->bValue = status; | |
2680 | } | |
2681 | fsg->intreq->length = CBI_INTERRUPT_DATA_LEN; | |
2682 | ||
2683 | fsg->intr_buffhd = bh; // Point to the right buffhd | |
2684 | fsg->intreq->buf = bh->inreq->buf; | |
1da177e4 LT |
2685 | fsg->intreq->context = bh; |
2686 | start_transfer(fsg, fsg->intr_in, fsg->intreq, | |
2687 | &fsg->intreq_busy, &bh->state); | |
2688 | } | |
2689 | ||
2690 | fsg->next_buffhd_to_fill = bh->next; | |
2691 | return 0; | |
2692 | } | |
2693 | ||
2694 | ||
2695 | /*-------------------------------------------------------------------------*/ | |
2696 | ||
2697 | /* Check whether the command is properly formed and whether its data size | |
2698 | * and direction agree with the values we already have. */ | |
2699 | static int check_command(struct fsg_dev *fsg, int cmnd_size, | |
2700 | enum data_direction data_dir, unsigned int mask, | |
2701 | int needs_medium, const char *name) | |
2702 | { | |
2703 | int i; | |
2704 | int lun = fsg->cmnd[1] >> 5; | |
2705 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; | |
2706 | char hdlen[20]; | |
2707 | struct lun *curlun; | |
2708 | ||
2709 | /* Adjust the expected cmnd_size for protocol encapsulation padding. | |
2710 | * Transparent SCSI doesn't pad. */ | |
2711 | if (protocol_is_scsi()) | |
2712 | ; | |
2713 | ||
2714 | /* There's some disagreement as to whether RBC pads commands or not. | |
2715 | * We'll play it safe and accept either form. */ | |
2716 | else if (mod_data.protocol_type == USB_SC_RBC) { | |
2717 | if (fsg->cmnd_size == 12) | |
2718 | cmnd_size = 12; | |
2719 | ||
2720 | /* All the other protocols pad to 12 bytes */ | |
2721 | } else | |
2722 | cmnd_size = 12; | |
2723 | ||
2724 | hdlen[0] = 0; | |
2725 | if (fsg->data_dir != DATA_DIR_UNKNOWN) | |
2726 | sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir], | |
2727 | fsg->data_size); | |
2728 | VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", | |
2729 | name, cmnd_size, dirletter[(int) data_dir], | |
2730 | fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen); | |
2731 | ||
2732 | /* We can't reply at all until we know the correct data direction | |
2733 | * and size. */ | |
2734 | if (fsg->data_size_from_cmnd == 0) | |
2735 | data_dir = DATA_DIR_NONE; | |
2736 | if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI | |
2737 | fsg->data_dir = data_dir; | |
2738 | fsg->data_size = fsg->data_size_from_cmnd; | |
2739 | ||
2740 | } else { // Bulk-only | |
2741 | if (fsg->data_size < fsg->data_size_from_cmnd) { | |
2742 | ||
2743 | /* Host data size < Device data size is a phase error. | |
2744 | * Carry out the command, but only transfer as much | |
2745 | * as we are allowed. */ | |
2746 | fsg->data_size_from_cmnd = fsg->data_size; | |
2747 | fsg->phase_error = 1; | |
2748 | } | |
2749 | } | |
2750 | fsg->residue = fsg->usb_amount_left = fsg->data_size; | |
2751 | ||
2752 | /* Conflicting data directions is a phase error */ | |
2753 | if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) { | |
2754 | fsg->phase_error = 1; | |
2755 | return -EINVAL; | |
2756 | } | |
2757 | ||
2758 | /* Verify the length of the command itself */ | |
2759 | if (cmnd_size != fsg->cmnd_size) { | |
2760 | ||
549c41e0 FB |
2761 | /* Special case workaround: There are plenty of buggy SCSI |
2762 | * implementations. Many have issues with cbw->Length | |
2763 | * field passing a wrong command size. For those cases we | |
2764 | * always try to work around the problem by using the length | |
2765 | * sent by the host side provided it is at least as large | |
2766 | * as the correct command length. | |
2767 | * Examples of such cases would be MS-Windows, which issues | |
2768 | * REQUEST SENSE with cbw->Length == 12 where it should | |
2769 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and | |
2770 | * REQUEST SENSE with cbw->Length == 10 where it should | |
2771 | * be 6 as well. | |
2772 | */ | |
2773 | if (cmnd_size <= fsg->cmnd_size) { | |
2774 | DBG(fsg, "%s is buggy! Expected length %d " | |
2775 | "but we got %d\n", name, | |
2776 | cmnd_size, fsg->cmnd_size); | |
1da177e4 | 2777 | cmnd_size = fsg->cmnd_size; |
549c41e0 | 2778 | } else { |
1da177e4 LT |
2779 | fsg->phase_error = 1; |
2780 | return -EINVAL; | |
2781 | } | |
2782 | } | |
2783 | ||
d794ac7a | 2784 | /* Check that the LUN values are consistent */ |
1da177e4 LT |
2785 | if (transport_is_bbb()) { |
2786 | if (fsg->lun != lun) | |
2787 | DBG(fsg, "using LUN %d from CBW, " | |
2788 | "not LUN %d from CDB\n", | |
2789 | fsg->lun, lun); | |
2790 | } else | |
2791 | fsg->lun = lun; // Use LUN from the command | |
2792 | ||
2793 | /* Check the LUN */ | |
2794 | if (fsg->lun >= 0 && fsg->lun < fsg->nluns) { | |
2795 | fsg->curlun = curlun = &fsg->luns[fsg->lun]; | |
2796 | if (fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2797 | curlun->sense_data = SS_NO_SENSE; | |
2798 | curlun->sense_data_info = 0; | |
6174d0fd | 2799 | curlun->info_valid = 0; |
1da177e4 LT |
2800 | } |
2801 | } else { | |
2802 | fsg->curlun = curlun = NULL; | |
2803 | fsg->bad_lun_okay = 0; | |
2804 | ||
2805 | /* INQUIRY and REQUEST SENSE commands are explicitly allowed | |
2806 | * to use unsupported LUNs; all others may not. */ | |
2807 | if (fsg->cmnd[0] != SC_INQUIRY && | |
2808 | fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2809 | DBG(fsg, "unsupported LUN %d\n", fsg->lun); | |
2810 | return -EINVAL; | |
2811 | } | |
2812 | } | |
2813 | ||
2814 | /* If a unit attention condition exists, only INQUIRY and | |
2815 | * REQUEST SENSE commands are allowed; anything else must fail. */ | |
2816 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE && | |
2817 | fsg->cmnd[0] != SC_INQUIRY && | |
2818 | fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2819 | curlun->sense_data = curlun->unit_attention_data; | |
2820 | curlun->unit_attention_data = SS_NO_SENSE; | |
2821 | return -EINVAL; | |
2822 | } | |
2823 | ||
2824 | /* Check that only command bytes listed in the mask are non-zero */ | |
2825 | fsg->cmnd[1] &= 0x1f; // Mask away the LUN | |
2826 | for (i = 1; i < cmnd_size; ++i) { | |
2827 | if (fsg->cmnd[i] && !(mask & (1 << i))) { | |
2828 | if (curlun) | |
2829 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2830 | return -EINVAL; | |
2831 | } | |
2832 | } | |
2833 | ||
2834 | /* If the medium isn't mounted and the command needs to access | |
2835 | * it, return an error. */ | |
2836 | if (curlun && !backing_file_is_open(curlun) && needs_medium) { | |
2837 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
2838 | return -EINVAL; | |
2839 | } | |
2840 | ||
2841 | return 0; | |
2842 | } | |
2843 | ||
2844 | ||
2845 | static int do_scsi_command(struct fsg_dev *fsg) | |
2846 | { | |
2847 | struct fsg_buffhd *bh; | |
2848 | int rc; | |
2849 | int reply = -EINVAL; | |
2850 | int i; | |
2851 | static char unknown[16]; | |
2852 | ||
2853 | dump_cdb(fsg); | |
2854 | ||
2855 | /* Wait for the next buffer to become available for data or status */ | |
2856 | bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill; | |
2857 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2858 | rc = sleep_thread(fsg); |
2859 | if (rc) | |
1da177e4 | 2860 | return rc; |
79a7d9ee | 2861 | } |
1da177e4 LT |
2862 | fsg->phase_error = 0; |
2863 | fsg->short_packet_received = 0; | |
2864 | ||
2865 | down_read(&fsg->filesem); // We're using the backing file | |
2866 | switch (fsg->cmnd[0]) { | |
2867 | ||
2868 | case SC_INQUIRY: | |
2869 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2870 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2871 | (1<<4), 0, | |
2872 | "INQUIRY")) == 0) | |
2873 | reply = do_inquiry(fsg, bh); | |
2874 | break; | |
2875 | ||
2876 | case SC_MODE_SELECT_6: | |
2877 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2878 | if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, | |
2879 | (1<<1) | (1<<4), 0, | |
2880 | "MODE SELECT(6)")) == 0) | |
2881 | reply = do_mode_select(fsg, bh); | |
2882 | break; | |
2883 | ||
2884 | case SC_MODE_SELECT_10: | |
2885 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); | |
2886 | if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, | |
2887 | (1<<1) | (3<<7), 0, | |
2888 | "MODE SELECT(10)")) == 0) | |
2889 | reply = do_mode_select(fsg, bh); | |
2890 | break; | |
2891 | ||
2892 | case SC_MODE_SENSE_6: | |
2893 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2894 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2895 | (1<<1) | (1<<2) | (1<<4), 0, | |
2896 | "MODE SENSE(6)")) == 0) | |
2897 | reply = do_mode_sense(fsg, bh); | |
2898 | break; | |
2899 | ||
2900 | case SC_MODE_SENSE_10: | |
2901 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); | |
2902 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2903 | (1<<1) | (1<<2) | (3<<7), 0, | |
2904 | "MODE SENSE(10)")) == 0) | |
2905 | reply = do_mode_sense(fsg, bh); | |
2906 | break; | |
2907 | ||
2908 | case SC_PREVENT_ALLOW_MEDIUM_REMOVAL: | |
2909 | fsg->data_size_from_cmnd = 0; | |
2910 | if ((reply = check_command(fsg, 6, DATA_DIR_NONE, | |
2911 | (1<<4), 0, | |
2912 | "PREVENT-ALLOW MEDIUM REMOVAL")) == 0) | |
2913 | reply = do_prevent_allow(fsg); | |
2914 | break; | |
2915 | ||
2916 | case SC_READ_6: | |
2917 | i = fsg->cmnd[4]; | |
2918 | fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; | |
2919 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2920 | (7<<1) | (1<<4), 1, | |
2921 | "READ(6)")) == 0) | |
2922 | reply = do_read(fsg); | |
2923 | break; | |
2924 | ||
2925 | case SC_READ_10: | |
2926 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9; | |
2927 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2928 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
2929 | "READ(10)")) == 0) | |
2930 | reply = do_read(fsg); | |
2931 | break; | |
2932 | ||
2933 | case SC_READ_12: | |
2934 | fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9; | |
2935 | if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST, | |
2936 | (1<<1) | (0xf<<2) | (0xf<<6), 1, | |
2937 | "READ(12)")) == 0) | |
2938 | reply = do_read(fsg); | |
2939 | break; | |
2940 | ||
2941 | case SC_READ_CAPACITY: | |
2942 | fsg->data_size_from_cmnd = 8; | |
2943 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2944 | (0xf<<2) | (1<<8), 1, | |
2945 | "READ CAPACITY")) == 0) | |
2946 | reply = do_read_capacity(fsg, bh); | |
2947 | break; | |
2948 | ||
12aae68a AS |
2949 | case SC_READ_HEADER: |
2950 | if (!mod_data.cdrom) | |
2951 | goto unknown_cmnd; | |
2952 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); | |
2953 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2954 | (3<<7) | (0x1f<<1), 1, | |
2955 | "READ HEADER")) == 0) | |
2956 | reply = do_read_header(fsg, bh); | |
2957 | break; | |
2958 | ||
2959 | case SC_READ_TOC: | |
2960 | if (!mod_data.cdrom) | |
2961 | goto unknown_cmnd; | |
2962 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); | |
2963 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2964 | (7<<6) | (1<<1), 1, | |
2965 | "READ TOC")) == 0) | |
2966 | reply = do_read_toc(fsg, bh); | |
2967 | break; | |
2968 | ||
1da177e4 LT |
2969 | case SC_READ_FORMAT_CAPACITIES: |
2970 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); | |
2971 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2972 | (3<<7), 1, | |
2973 | "READ FORMAT CAPACITIES")) == 0) | |
2974 | reply = do_read_format_capacities(fsg, bh); | |
2975 | break; | |
2976 | ||
2977 | case SC_REQUEST_SENSE: | |
2978 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2979 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2980 | (1<<4), 0, | |
2981 | "REQUEST SENSE")) == 0) | |
2982 | reply = do_request_sense(fsg, bh); | |
2983 | break; | |
2984 | ||
2985 | case SC_START_STOP_UNIT: | |
2986 | fsg->data_size_from_cmnd = 0; | |
2987 | if ((reply = check_command(fsg, 6, DATA_DIR_NONE, | |
2988 | (1<<1) | (1<<4), 0, | |
2989 | "START-STOP UNIT")) == 0) | |
2990 | reply = do_start_stop(fsg); | |
2991 | break; | |
2992 | ||
2993 | case SC_SYNCHRONIZE_CACHE: | |
2994 | fsg->data_size_from_cmnd = 0; | |
2995 | if ((reply = check_command(fsg, 10, DATA_DIR_NONE, | |
2996 | (0xf<<2) | (3<<7), 1, | |
2997 | "SYNCHRONIZE CACHE")) == 0) | |
2998 | reply = do_synchronize_cache(fsg); | |
2999 | break; | |
3000 | ||
3001 | case SC_TEST_UNIT_READY: | |
3002 | fsg->data_size_from_cmnd = 0; | |
3003 | reply = check_command(fsg, 6, DATA_DIR_NONE, | |
3004 | 0, 1, | |
3005 | "TEST UNIT READY"); | |
3006 | break; | |
3007 | ||
3008 | /* Although optional, this command is used by MS-Windows. We | |
3009 | * support a minimal version: BytChk must be 0. */ | |
3010 | case SC_VERIFY: | |
3011 | fsg->data_size_from_cmnd = 0; | |
3012 | if ((reply = check_command(fsg, 10, DATA_DIR_NONE, | |
3013 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
3014 | "VERIFY")) == 0) | |
3015 | reply = do_verify(fsg); | |
3016 | break; | |
3017 | ||
3018 | case SC_WRITE_6: | |
3019 | i = fsg->cmnd[4]; | |
3020 | fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; | |
3021 | if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, | |
3022 | (7<<1) | (1<<4), 1, | |
3023 | "WRITE(6)")) == 0) | |
3024 | reply = do_write(fsg); | |
3025 | break; | |
3026 | ||
3027 | case SC_WRITE_10: | |
3028 | fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9; | |
3029 | if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, | |
3030 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
3031 | "WRITE(10)")) == 0) | |
3032 | reply = do_write(fsg); | |
3033 | break; | |
3034 | ||
3035 | case SC_WRITE_12: | |
3036 | fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9; | |
3037 | if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST, | |
3038 | (1<<1) | (0xf<<2) | (0xf<<6), 1, | |
3039 | "WRITE(12)")) == 0) | |
3040 | reply = do_write(fsg); | |
3041 | break; | |
3042 | ||
3043 | /* Some mandatory commands that we recognize but don't implement. | |
3044 | * They don't mean much in this setting. It's left as an exercise | |
3045 | * for anyone interested to implement RESERVE and RELEASE in terms | |
3046 | * of Posix locks. */ | |
3047 | case SC_FORMAT_UNIT: | |
3048 | case SC_RELEASE: | |
3049 | case SC_RESERVE: | |
3050 | case SC_SEND_DIAGNOSTIC: | |
3051 | // Fall through | |
3052 | ||
3053 | default: | |
12aae68a | 3054 | unknown_cmnd: |
1da177e4 LT |
3055 | fsg->data_size_from_cmnd = 0; |
3056 | sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]); | |
3057 | if ((reply = check_command(fsg, fsg->cmnd_size, | |
3058 | DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) { | |
3059 | fsg->curlun->sense_data = SS_INVALID_COMMAND; | |
3060 | reply = -EINVAL; | |
3061 | } | |
3062 | break; | |
3063 | } | |
3064 | up_read(&fsg->filesem); | |
3065 | ||
3066 | if (reply == -EINTR || signal_pending(current)) | |
3067 | return -EINTR; | |
3068 | ||
3069 | /* Set up the single reply buffer for finish_reply() */ | |
3070 | if (reply == -EINVAL) | |
3071 | reply = 0; // Error reply length | |
3072 | if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) { | |
3073 | reply = min((u32) reply, fsg->data_size_from_cmnd); | |
3074 | bh->inreq->length = reply; | |
3075 | bh->state = BUF_STATE_FULL; | |
3076 | fsg->residue -= reply; | |
3077 | } // Otherwise it's already set | |
3078 | ||
3079 | return 0; | |
3080 | } | |
3081 | ||
3082 | ||
3083 | /*-------------------------------------------------------------------------*/ | |
3084 | ||
3085 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
3086 | { | |
3087 | struct usb_request *req = bh->outreq; | |
7ca46b86 | 3088 | struct bulk_cb_wrap *cbw = req->buf; |
1da177e4 | 3089 | |
b950bdbc AS |
3090 | /* Was this a real packet? Should it be ignored? */ |
3091 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) | |
1da177e4 LT |
3092 | return -EINVAL; |
3093 | ||
3094 | /* Is the CBW valid? */ | |
3095 | if (req->actual != USB_BULK_CB_WRAP_LEN || | |
551509d2 | 3096 | cbw->Signature != cpu_to_le32( |
1da177e4 LT |
3097 | USB_BULK_CB_SIG)) { |
3098 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", | |
3099 | req->actual, | |
3100 | le32_to_cpu(cbw->Signature)); | |
3101 | ||
b950bdbc AS |
3102 | /* The Bulk-only spec says we MUST stall the IN endpoint |
3103 | * (6.6.1), so it's unavoidable. It also says we must | |
3104 | * retain this state until the next reset, but there's | |
3105 | * no way to tell the controller driver it should ignore | |
3106 | * Clear-Feature(HALT) requests. | |
3107 | * | |
3108 | * We aren't required to halt the OUT endpoint; instead | |
3109 | * we can simply accept and discard any data received | |
3110 | * until the next reset. */ | |
62fd2cac | 3111 | wedge_bulk_in_endpoint(fsg); |
b950bdbc | 3112 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
1da177e4 LT |
3113 | return -EINVAL; |
3114 | } | |
3115 | ||
3116 | /* Is the CBW meaningful? */ | |
3117 | if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG || | |
12943f09 | 3118 | cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { |
1da177e4 LT |
3119 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
3120 | "cmdlen %u\n", | |
3121 | cbw->Lun, cbw->Flags, cbw->Length); | |
3122 | ||
3123 | /* We can do anything we want here, so let's stall the | |
3124 | * bulk pipes if we are allowed to. */ | |
3125 | if (mod_data.can_stall) { | |
3126 | fsg_set_halt(fsg, fsg->bulk_out); | |
3127 | halt_bulk_in_endpoint(fsg); | |
3128 | } | |
3129 | return -EINVAL; | |
3130 | } | |
3131 | ||
3132 | /* Save the command for later */ | |
3133 | fsg->cmnd_size = cbw->Length; | |
3134 | memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size); | |
3135 | if (cbw->Flags & USB_BULK_IN_FLAG) | |
3136 | fsg->data_dir = DATA_DIR_TO_HOST; | |
3137 | else | |
3138 | fsg->data_dir = DATA_DIR_FROM_HOST; | |
3139 | fsg->data_size = le32_to_cpu(cbw->DataTransferLength); | |
3140 | if (fsg->data_size == 0) | |
3141 | fsg->data_dir = DATA_DIR_NONE; | |
3142 | fsg->lun = cbw->Lun; | |
3143 | fsg->tag = cbw->Tag; | |
3144 | return 0; | |
3145 | } | |
3146 | ||
3147 | ||
3148 | static int get_next_command(struct fsg_dev *fsg) | |
3149 | { | |
3150 | struct fsg_buffhd *bh; | |
3151 | int rc = 0; | |
3152 | ||
3153 | if (transport_is_bbb()) { | |
3154 | ||
3155 | /* Wait for the next buffer to become available */ | |
3156 | bh = fsg->next_buffhd_to_fill; | |
3157 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
3158 | rc = sleep_thread(fsg); |
3159 | if (rc) | |
1da177e4 | 3160 | return rc; |
79a7d9ee | 3161 | } |
1da177e4 LT |
3162 | |
3163 | /* Queue a request to read a Bulk-only CBW */ | |
3164 | set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); | |
70ffe6e1 | 3165 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
3166 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
3167 | &bh->outreq_busy, &bh->state); | |
3168 | ||
3169 | /* We will drain the buffer in software, which means we | |
3170 | * can reuse it for the next filling. No need to advance | |
3171 | * next_buffhd_to_fill. */ | |
3172 | ||
3173 | /* Wait for the CBW to arrive */ | |
3174 | while (bh->state != BUF_STATE_FULL) { | |
79a7d9ee AS |
3175 | rc = sleep_thread(fsg); |
3176 | if (rc) | |
1da177e4 | 3177 | return rc; |
79a7d9ee | 3178 | } |
a21d4fed | 3179 | smp_rmb(); |
1da177e4 LT |
3180 | rc = received_cbw(fsg, bh); |
3181 | bh->state = BUF_STATE_EMPTY; | |
3182 | ||
3183 | } else { // USB_PR_CB or USB_PR_CBI | |
3184 | ||
3185 | /* Wait for the next command to arrive */ | |
3186 | while (fsg->cbbuf_cmnd_size == 0) { | |
79a7d9ee AS |
3187 | rc = sleep_thread(fsg); |
3188 | if (rc) | |
1da177e4 | 3189 | return rc; |
79a7d9ee | 3190 | } |
1da177e4 LT |
3191 | |
3192 | /* Is the previous status interrupt request still busy? | |
3193 | * The host is allowed to skip reading the status, | |
3194 | * so we must cancel it. */ | |
3195 | if (fsg->intreq_busy) | |
3196 | usb_ep_dequeue(fsg->intr_in, fsg->intreq); | |
3197 | ||
3198 | /* Copy the command and mark the buffer empty */ | |
3199 | fsg->data_dir = DATA_DIR_UNKNOWN; | |
3200 | spin_lock_irq(&fsg->lock); | |
3201 | fsg->cmnd_size = fsg->cbbuf_cmnd_size; | |
3202 | memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size); | |
3203 | fsg->cbbuf_cmnd_size = 0; | |
3204 | spin_unlock_irq(&fsg->lock); | |
3205 | } | |
3206 | return rc; | |
3207 | } | |
3208 | ||
3209 | ||
3210 | /*-------------------------------------------------------------------------*/ | |
3211 | ||
3212 | static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep, | |
3213 | const struct usb_endpoint_descriptor *d) | |
3214 | { | |
3215 | int rc; | |
3216 | ||
3217 | ep->driver_data = fsg; | |
3218 | rc = usb_ep_enable(ep, d); | |
3219 | if (rc) | |
3220 | ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc); | |
3221 | return rc; | |
3222 | } | |
3223 | ||
3224 | static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep, | |
3225 | struct usb_request **preq) | |
3226 | { | |
3227 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
3228 | if (*preq) | |
3229 | return 0; | |
3230 | ERROR(fsg, "can't allocate request for %s\n", ep->name); | |
3231 | return -ENOMEM; | |
3232 | } | |
3233 | ||
3234 | /* | |
3235 | * Reset interface setting and re-init endpoint state (toggle etc). | |
3236 | * Call with altsetting < 0 to disable the interface. The only other | |
3237 | * available altsetting is 0, which enables the interface. | |
3238 | */ | |
3239 | static int do_set_interface(struct fsg_dev *fsg, int altsetting) | |
3240 | { | |
3241 | int rc = 0; | |
3242 | int i; | |
3243 | const struct usb_endpoint_descriptor *d; | |
3244 | ||
3245 | if (fsg->running) | |
3246 | DBG(fsg, "reset interface\n"); | |
3247 | ||
3248 | reset: | |
3249 | /* Deallocate the requests */ | |
3250 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
3251 | struct fsg_buffhd *bh = &fsg->buffhds[i]; | |
3252 | ||
3253 | if (bh->inreq) { | |
3254 | usb_ep_free_request(fsg->bulk_in, bh->inreq); | |
3255 | bh->inreq = NULL; | |
3256 | } | |
3257 | if (bh->outreq) { | |
3258 | usb_ep_free_request(fsg->bulk_out, bh->outreq); | |
3259 | bh->outreq = NULL; | |
3260 | } | |
3261 | } | |
3262 | if (fsg->intreq) { | |
3263 | usb_ep_free_request(fsg->intr_in, fsg->intreq); | |
3264 | fsg->intreq = NULL; | |
3265 | } | |
3266 | ||
3267 | /* Disable the endpoints */ | |
3268 | if (fsg->bulk_in_enabled) { | |
3269 | usb_ep_disable(fsg->bulk_in); | |
3270 | fsg->bulk_in_enabled = 0; | |
3271 | } | |
3272 | if (fsg->bulk_out_enabled) { | |
3273 | usb_ep_disable(fsg->bulk_out); | |
3274 | fsg->bulk_out_enabled = 0; | |
3275 | } | |
3276 | if (fsg->intr_in_enabled) { | |
3277 | usb_ep_disable(fsg->intr_in); | |
3278 | fsg->intr_in_enabled = 0; | |
3279 | } | |
3280 | ||
3281 | fsg->running = 0; | |
3282 | if (altsetting < 0 || rc != 0) | |
3283 | return rc; | |
3284 | ||
3285 | DBG(fsg, "set interface %d\n", altsetting); | |
3286 | ||
3287 | /* Enable the endpoints */ | |
3288 | d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc); | |
3289 | if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0) | |
3290 | goto reset; | |
3291 | fsg->bulk_in_enabled = 1; | |
3292 | ||
3293 | d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc); | |
3294 | if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0) | |
3295 | goto reset; | |
3296 | fsg->bulk_out_enabled = 1; | |
3297 | fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize); | |
b950bdbc | 3298 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
1da177e4 LT |
3299 | |
3300 | if (transport_is_cbi()) { | |
3301 | d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc); | |
3302 | if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0) | |
3303 | goto reset; | |
3304 | fsg->intr_in_enabled = 1; | |
3305 | } | |
3306 | ||
3307 | /* Allocate the requests */ | |
3308 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
3309 | struct fsg_buffhd *bh = &fsg->buffhds[i]; | |
3310 | ||
3311 | if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0) | |
3312 | goto reset; | |
3313 | if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0) | |
3314 | goto reset; | |
3315 | bh->inreq->buf = bh->outreq->buf = bh->buf; | |
1da177e4 LT |
3316 | bh->inreq->context = bh->outreq->context = bh; |
3317 | bh->inreq->complete = bulk_in_complete; | |
3318 | bh->outreq->complete = bulk_out_complete; | |
3319 | } | |
3320 | if (transport_is_cbi()) { | |
3321 | if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0) | |
3322 | goto reset; | |
3323 | fsg->intreq->complete = intr_in_complete; | |
3324 | } | |
3325 | ||
3326 | fsg->running = 1; | |
3327 | for (i = 0; i < fsg->nluns; ++i) | |
3328 | fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED; | |
3329 | return rc; | |
3330 | } | |
3331 | ||
3332 | ||
3333 | /* | |
3334 | * Change our operational configuration. This code must agree with the code | |
3335 | * that returns config descriptors, and with interface altsetting code. | |
3336 | * | |
3337 | * It's also responsible for power management interactions. Some | |
3338 | * configurations might not work with our current power sources. | |
3339 | * For now we just assume the gadget is always self-powered. | |
3340 | */ | |
3341 | static int do_set_config(struct fsg_dev *fsg, u8 new_config) | |
3342 | { | |
3343 | int rc = 0; | |
3344 | ||
3345 | /* Disable the single interface */ | |
3346 | if (fsg->config != 0) { | |
3347 | DBG(fsg, "reset config\n"); | |
3348 | fsg->config = 0; | |
3349 | rc = do_set_interface(fsg, -1); | |
3350 | } | |
3351 | ||
3352 | /* Enable the interface */ | |
3353 | if (new_config != 0) { | |
3354 | fsg->config = new_config; | |
3355 | if ((rc = do_set_interface(fsg, 0)) != 0) | |
3356 | fsg->config = 0; // Reset on errors | |
3357 | else { | |
3358 | char *speed; | |
3359 | ||
3360 | switch (fsg->gadget->speed) { | |
3361 | case USB_SPEED_LOW: speed = "low"; break; | |
3362 | case USB_SPEED_FULL: speed = "full"; break; | |
3363 | case USB_SPEED_HIGH: speed = "high"; break; | |
3364 | default: speed = "?"; break; | |
3365 | } | |
3366 | INFO(fsg, "%s speed config #%d\n", speed, fsg->config); | |
3367 | } | |
3368 | } | |
3369 | return rc; | |
3370 | } | |
3371 | ||
3372 | ||
3373 | /*-------------------------------------------------------------------------*/ | |
3374 | ||
3375 | static void handle_exception(struct fsg_dev *fsg) | |
3376 | { | |
3377 | siginfo_t info; | |
3378 | int sig; | |
3379 | int i; | |
3380 | int num_active; | |
3381 | struct fsg_buffhd *bh; | |
3382 | enum fsg_state old_state; | |
3383 | u8 new_config; | |
3384 | struct lun *curlun; | |
3385 | unsigned int exception_req_tag; | |
3386 | int rc; | |
3387 | ||
3388 | /* Clear the existing signals. Anything but SIGUSR1 is converted | |
3389 | * into a high-priority EXIT exception. */ | |
3390 | for (;;) { | |
8cfbe7e6 | 3391 | sig = dequeue_signal_lock(current, ¤t->blocked, &info); |
1da177e4 LT |
3392 | if (!sig) |
3393 | break; | |
3394 | if (sig != SIGUSR1) { | |
3395 | if (fsg->state < FSG_STATE_EXIT) | |
3396 | DBG(fsg, "Main thread exiting on signal\n"); | |
3397 | raise_exception(fsg, FSG_STATE_EXIT); | |
3398 | } | |
3399 | } | |
3400 | ||
3401 | /* Cancel all the pending transfers */ | |
3402 | if (fsg->intreq_busy) | |
3403 | usb_ep_dequeue(fsg->intr_in, fsg->intreq); | |
3404 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
3405 | bh = &fsg->buffhds[i]; | |
3406 | if (bh->inreq_busy) | |
3407 | usb_ep_dequeue(fsg->bulk_in, bh->inreq); | |
3408 | if (bh->outreq_busy) | |
3409 | usb_ep_dequeue(fsg->bulk_out, bh->outreq); | |
3410 | } | |
3411 | ||
3412 | /* Wait until everything is idle */ | |
3413 | for (;;) { | |
3414 | num_active = fsg->intreq_busy; | |
3415 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
3416 | bh = &fsg->buffhds[i]; | |
3417 | num_active += bh->inreq_busy + bh->outreq_busy; | |
3418 | } | |
3419 | if (num_active == 0) | |
3420 | break; | |
3421 | if (sleep_thread(fsg)) | |
3422 | return; | |
3423 | } | |
3424 | ||
3425 | /* Clear out the controller's fifos */ | |
3426 | if (fsg->bulk_in_enabled) | |
3427 | usb_ep_fifo_flush(fsg->bulk_in); | |
3428 | if (fsg->bulk_out_enabled) | |
3429 | usb_ep_fifo_flush(fsg->bulk_out); | |
3430 | if (fsg->intr_in_enabled) | |
3431 | usb_ep_fifo_flush(fsg->intr_in); | |
3432 | ||
3433 | /* Reset the I/O buffer states and pointers, the SCSI | |
3434 | * state, and the exception. Then invoke the handler. */ | |
3435 | spin_lock_irq(&fsg->lock); | |
3436 | ||
3437 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
3438 | bh = &fsg->buffhds[i]; | |
3439 | bh->state = BUF_STATE_EMPTY; | |
3440 | } | |
3441 | fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain = | |
3442 | &fsg->buffhds[0]; | |
3443 | ||
3444 | exception_req_tag = fsg->exception_req_tag; | |
3445 | new_config = fsg->new_config; | |
3446 | old_state = fsg->state; | |
3447 | ||
3448 | if (old_state == FSG_STATE_ABORT_BULK_OUT) | |
3449 | fsg->state = FSG_STATE_STATUS_PHASE; | |
3450 | else { | |
3451 | for (i = 0; i < fsg->nluns; ++i) { | |
3452 | curlun = &fsg->luns[i]; | |
3453 | curlun->prevent_medium_removal = 0; | |
3454 | curlun->sense_data = curlun->unit_attention_data = | |
3455 | SS_NO_SENSE; | |
3456 | curlun->sense_data_info = 0; | |
6174d0fd | 3457 | curlun->info_valid = 0; |
1da177e4 LT |
3458 | } |
3459 | fsg->state = FSG_STATE_IDLE; | |
3460 | } | |
3461 | spin_unlock_irq(&fsg->lock); | |
3462 | ||
3463 | /* Carry out any extra actions required for the exception */ | |
3464 | switch (old_state) { | |
3465 | default: | |
3466 | break; | |
3467 | ||
3468 | case FSG_STATE_ABORT_BULK_OUT: | |
3469 | send_status(fsg); | |
3470 | spin_lock_irq(&fsg->lock); | |
3471 | if (fsg->state == FSG_STATE_STATUS_PHASE) | |
3472 | fsg->state = FSG_STATE_IDLE; | |
3473 | spin_unlock_irq(&fsg->lock); | |
3474 | break; | |
3475 | ||
3476 | case FSG_STATE_RESET: | |
3477 | /* In case we were forced against our will to halt a | |
3478 | * bulk endpoint, clear the halt now. (The SuperH UDC | |
3479 | * requires this.) */ | |
b950bdbc | 3480 | if (test_and_clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) |
1da177e4 | 3481 | usb_ep_clear_halt(fsg->bulk_in); |
1da177e4 LT |
3482 | |
3483 | if (transport_is_bbb()) { | |
3484 | if (fsg->ep0_req_tag == exception_req_tag) | |
3485 | ep0_queue(fsg); // Complete the status stage | |
3486 | ||
3487 | } else if (transport_is_cbi()) | |
3488 | send_status(fsg); // Status by interrupt pipe | |
3489 | ||
3490 | /* Technically this should go here, but it would only be | |
3491 | * a waste of time. Ditto for the INTERFACE_CHANGE and | |
3492 | * CONFIG_CHANGE cases. */ | |
3493 | // for (i = 0; i < fsg->nluns; ++i) | |
3494 | // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED; | |
3495 | break; | |
3496 | ||
3497 | case FSG_STATE_INTERFACE_CHANGE: | |
3498 | rc = do_set_interface(fsg, 0); | |
3499 | if (fsg->ep0_req_tag != exception_req_tag) | |
3500 | break; | |
3501 | if (rc != 0) // STALL on errors | |
3502 | fsg_set_halt(fsg, fsg->ep0); | |
3503 | else // Complete the status stage | |
3504 | ep0_queue(fsg); | |
3505 | break; | |
3506 | ||
3507 | case FSG_STATE_CONFIG_CHANGE: | |
3508 | rc = do_set_config(fsg, new_config); | |
3509 | if (fsg->ep0_req_tag != exception_req_tag) | |
3510 | break; | |
3511 | if (rc != 0) // STALL on errors | |
3512 | fsg_set_halt(fsg, fsg->ep0); | |
3513 | else // Complete the status stage | |
3514 | ep0_queue(fsg); | |
3515 | break; | |
3516 | ||
3517 | case FSG_STATE_DISCONNECT: | |
3518 | fsync_all(fsg); | |
3519 | do_set_config(fsg, 0); // Unconfigured state | |
3520 | break; | |
3521 | ||
3522 | case FSG_STATE_EXIT: | |
3523 | case FSG_STATE_TERMINATED: | |
3524 | do_set_config(fsg, 0); // Free resources | |
3525 | spin_lock_irq(&fsg->lock); | |
3526 | fsg->state = FSG_STATE_TERMINATED; // Stop the thread | |
3527 | spin_unlock_irq(&fsg->lock); | |
3528 | break; | |
3529 | } | |
3530 | } | |
3531 | ||
3532 | ||
3533 | /*-------------------------------------------------------------------------*/ | |
3534 | ||
3535 | static int fsg_main_thread(void *fsg_) | |
3536 | { | |
7ca46b86 | 3537 | struct fsg_dev *fsg = fsg_; |
1da177e4 | 3538 | |
1da177e4 LT |
3539 | /* Allow the thread to be killed by a signal, but set the signal mask |
3540 | * to block everything but INT, TERM, KILL, and USR1. */ | |
8cfbe7e6 ON |
3541 | allow_signal(SIGINT); |
3542 | allow_signal(SIGTERM); | |
3543 | allow_signal(SIGKILL); | |
3544 | allow_signal(SIGUSR1); | |
1da177e4 | 3545 | |
83144186 RW |
3546 | /* Allow the thread to be frozen */ |
3547 | set_freezable(); | |
3548 | ||
1da177e4 LT |
3549 | /* Arrange for userspace references to be interpreted as kernel |
3550 | * pointers. That way we can pass a kernel pointer to a routine | |
3551 | * that expects a __user pointer and it will work okay. */ | |
3552 | set_fs(get_ds()); | |
3553 | ||
1da177e4 LT |
3554 | /* The main loop */ |
3555 | while (fsg->state != FSG_STATE_TERMINATED) { | |
3556 | if (exception_in_progress(fsg) || signal_pending(current)) { | |
3557 | handle_exception(fsg); | |
3558 | continue; | |
3559 | } | |
3560 | ||
3561 | if (!fsg->running) { | |
3562 | sleep_thread(fsg); | |
3563 | continue; | |
3564 | } | |
3565 | ||
3566 | if (get_next_command(fsg)) | |
3567 | continue; | |
3568 | ||
3569 | spin_lock_irq(&fsg->lock); | |
3570 | if (!exception_in_progress(fsg)) | |
3571 | fsg->state = FSG_STATE_DATA_PHASE; | |
3572 | spin_unlock_irq(&fsg->lock); | |
3573 | ||
3574 | if (do_scsi_command(fsg) || finish_reply(fsg)) | |
3575 | continue; | |
3576 | ||
3577 | spin_lock_irq(&fsg->lock); | |
3578 | if (!exception_in_progress(fsg)) | |
3579 | fsg->state = FSG_STATE_STATUS_PHASE; | |
3580 | spin_unlock_irq(&fsg->lock); | |
3581 | ||
3582 | if (send_status(fsg)) | |
3583 | continue; | |
3584 | ||
3585 | spin_lock_irq(&fsg->lock); | |
3586 | if (!exception_in_progress(fsg)) | |
3587 | fsg->state = FSG_STATE_IDLE; | |
3588 | spin_unlock_irq(&fsg->lock); | |
3589 | } | |
3590 | ||
22efcf4a | 3591 | spin_lock_irq(&fsg->lock); |
1da177e4 | 3592 | fsg->thread_task = NULL; |
22efcf4a | 3593 | spin_unlock_irq(&fsg->lock); |
1da177e4 | 3594 | |
82a10a81 AS |
3595 | /* If we are exiting because of a signal, unregister the |
3596 | * gadget driver. */ | |
3597 | if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) | |
1da177e4 | 3598 | usb_gadget_unregister_driver(&fsg_driver); |
1da177e4 LT |
3599 | |
3600 | /* Let the unbind and cleanup routines know the thread has exited */ | |
3601 | complete_and_exit(&fsg->thread_notifier, 0); | |
3602 | } | |
3603 | ||
3604 | ||
3605 | /*-------------------------------------------------------------------------*/ | |
3606 | ||
3607 | /* If the next two routines are called while the gadget is registered, | |
3608 | * the caller must own fsg->filesem for writing. */ | |
3609 | ||
3610 | static int open_backing_file(struct lun *curlun, const char *filename) | |
3611 | { | |
3612 | int ro; | |
3613 | struct file *filp = NULL; | |
3614 | int rc = -EINVAL; | |
3615 | struct inode *inode = NULL; | |
3616 | loff_t size; | |
3617 | loff_t num_sectors; | |
12aae68a | 3618 | loff_t min_sectors; |
1da177e4 LT |
3619 | |
3620 | /* R/W if we can, R/O if we must */ | |
3621 | ro = curlun->ro; | |
3622 | if (!ro) { | |
3623 | filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); | |
3624 | if (-EROFS == PTR_ERR(filp)) | |
3625 | ro = 1; | |
3626 | } | |
3627 | if (ro) | |
3628 | filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); | |
3629 | if (IS_ERR(filp)) { | |
3630 | LINFO(curlun, "unable to open backing file: %s\n", filename); | |
3631 | return PTR_ERR(filp); | |
3632 | } | |
3633 | ||
3634 | if (!(filp->f_mode & FMODE_WRITE)) | |
3635 | ro = 1; | |
3636 | ||
33cb8994 JS |
3637 | if (filp->f_path.dentry) |
3638 | inode = filp->f_path.dentry->d_inode; | |
1da177e4 LT |
3639 | if (inode && S_ISBLK(inode->i_mode)) { |
3640 | if (bdev_read_only(inode->i_bdev)) | |
3641 | ro = 1; | |
3642 | } else if (!inode || !S_ISREG(inode->i_mode)) { | |
3643 | LINFO(curlun, "invalid file type: %s\n", filename); | |
3644 | goto out; | |
3645 | } | |
3646 | ||
3647 | /* If we can't read the file, it's no good. | |
3648 | * If we can't write the file, use it read-only. */ | |
3649 | if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) { | |
3650 | LINFO(curlun, "file not readable: %s\n", filename); | |
3651 | goto out; | |
3652 | } | |
3653 | if (!(filp->f_op->write || filp->f_op->aio_write)) | |
3654 | ro = 1; | |
3655 | ||
3656 | size = i_size_read(inode->i_mapping->host); | |
3657 | if (size < 0) { | |
3658 | LINFO(curlun, "unable to find file size: %s\n", filename); | |
3659 | rc = (int) size; | |
3660 | goto out; | |
3661 | } | |
12aae68a AS |
3662 | num_sectors = size >> 9; // File size in 512-byte blocks |
3663 | min_sectors = 1; | |
3664 | if (mod_data.cdrom) { | |
3665 | num_sectors &= ~3; // Reduce to a multiple of 2048 | |
3666 | min_sectors = 300*4; // Smallest track is 300 frames | |
3667 | if (num_sectors >= 256*60*75*4) { | |
3668 | num_sectors = (256*60*75 - 1) * 4; | |
3669 | LINFO(curlun, "file too big: %s\n", filename); | |
3670 | LINFO(curlun, "using only first %d blocks\n", | |
3671 | (int) num_sectors); | |
3672 | } | |
3673 | } | |
3674 | if (num_sectors < min_sectors) { | |
1da177e4 LT |
3675 | LINFO(curlun, "file too small: %s\n", filename); |
3676 | rc = -ETOOSMALL; | |
3677 | goto out; | |
3678 | } | |
3679 | ||
3680 | get_file(filp); | |
3681 | curlun->ro = ro; | |
3682 | curlun->filp = filp; | |
3683 | curlun->file_length = size; | |
3684 | curlun->num_sectors = num_sectors; | |
3685 | LDBG(curlun, "open backing file: %s\n", filename); | |
3686 | rc = 0; | |
3687 | ||
3688 | out: | |
3689 | filp_close(filp, current->files); | |
3690 | return rc; | |
3691 | } | |
3692 | ||
3693 | ||
3694 | static void close_backing_file(struct lun *curlun) | |
3695 | { | |
3696 | if (curlun->filp) { | |
3697 | LDBG(curlun, "close backing file\n"); | |
3698 | fput(curlun->filp); | |
3699 | curlun->filp = NULL; | |
3700 | } | |
3701 | } | |
3702 | ||
1da177e4 | 3703 | |
10523b3b | 3704 | static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
3705 | { |
3706 | struct lun *curlun = dev_to_lun(dev); | |
3707 | ||
3708 | return sprintf(buf, "%d\n", curlun->ro); | |
3709 | } | |
3710 | ||
79a7d9ee AS |
3711 | static ssize_t show_file(struct device *dev, struct device_attribute *attr, |
3712 | char *buf) | |
1da177e4 LT |
3713 | { |
3714 | struct lun *curlun = dev_to_lun(dev); | |
7ca46b86 | 3715 | struct fsg_dev *fsg = dev_get_drvdata(dev); |
1da177e4 LT |
3716 | char *p; |
3717 | ssize_t rc; | |
3718 | ||
3719 | down_read(&fsg->filesem); | |
3720 | if (backing_file_is_open(curlun)) { // Get the complete pathname | |
cf28b486 | 3721 | p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1); |
1da177e4 LT |
3722 | if (IS_ERR(p)) |
3723 | rc = PTR_ERR(p); | |
3724 | else { | |
3725 | rc = strlen(p); | |
3726 | memmove(buf, p, rc); | |
3727 | buf[rc] = '\n'; // Add a newline | |
3728 | buf[++rc] = 0; | |
3729 | } | |
3730 | } else { // No file, return 0 bytes | |
3731 | *buf = 0; | |
3732 | rc = 0; | |
3733 | } | |
3734 | up_read(&fsg->filesem); | |
3735 | return rc; | |
3736 | } | |
3737 | ||
3738 | ||
79a7d9ee AS |
3739 | static ssize_t store_ro(struct device *dev, struct device_attribute *attr, |
3740 | const char *buf, size_t count) | |
1da177e4 LT |
3741 | { |
3742 | ssize_t rc = count; | |
3743 | struct lun *curlun = dev_to_lun(dev); | |
7ca46b86 | 3744 | struct fsg_dev *fsg = dev_get_drvdata(dev); |
1da177e4 LT |
3745 | int i; |
3746 | ||
3747 | if (sscanf(buf, "%d", &i) != 1) | |
3748 | return -EINVAL; | |
3749 | ||
3750 | /* Allow the write-enable status to change only while the backing file | |
3751 | * is closed. */ | |
3752 | down_read(&fsg->filesem); | |
3753 | if (backing_file_is_open(curlun)) { | |
3754 | LDBG(curlun, "read-only status change prevented\n"); | |
3755 | rc = -EBUSY; | |
3756 | } else { | |
3757 | curlun->ro = !!i; | |
3758 | LDBG(curlun, "read-only status set to %d\n", curlun->ro); | |
3759 | } | |
3760 | up_read(&fsg->filesem); | |
3761 | return rc; | |
3762 | } | |
3763 | ||
79a7d9ee AS |
3764 | static ssize_t store_file(struct device *dev, struct device_attribute *attr, |
3765 | const char *buf, size_t count) | |
1da177e4 LT |
3766 | { |
3767 | struct lun *curlun = dev_to_lun(dev); | |
7ca46b86 | 3768 | struct fsg_dev *fsg = dev_get_drvdata(dev); |
1da177e4 LT |
3769 | int rc = 0; |
3770 | ||
3771 | if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) { | |
3772 | LDBG(curlun, "eject attempt prevented\n"); | |
3773 | return -EBUSY; // "Door is locked" | |
3774 | } | |
3775 | ||
3776 | /* Remove a trailing newline */ | |
3777 | if (count > 0 && buf[count-1] == '\n') | |
3778 | ((char *) buf)[count-1] = 0; // Ugh! | |
3779 | ||
3780 | /* Eject current medium */ | |
3781 | down_write(&fsg->filesem); | |
3782 | if (backing_file_is_open(curlun)) { | |
3783 | close_backing_file(curlun); | |
3784 | curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; | |
3785 | } | |
3786 | ||
3787 | /* Load new medium */ | |
3788 | if (count > 0 && buf[0]) { | |
3789 | rc = open_backing_file(curlun, buf); | |
3790 | if (rc == 0) | |
3791 | curlun->unit_attention_data = | |
3792 | SS_NOT_READY_TO_READY_TRANSITION; | |
3793 | } | |
3794 | up_write(&fsg->filesem); | |
3795 | return (rc < 0 ? rc : count); | |
3796 | } | |
3797 | ||
3798 | ||
3799 | /* The write permissions and store_xxx pointers are set in fsg_bind() */ | |
3800 | static DEVICE_ATTR(ro, 0444, show_ro, NULL); | |
3801 | static DEVICE_ATTR(file, 0444, show_file, NULL); | |
3802 | ||
3803 | ||
3804 | /*-------------------------------------------------------------------------*/ | |
3805 | ||
87c4252a AS |
3806 | static void fsg_release(struct kref *ref) |
3807 | { | |
3808 | struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref); | |
3809 | ||
3810 | kfree(fsg->luns); | |
3811 | kfree(fsg); | |
3812 | } | |
3813 | ||
1da177e4 LT |
3814 | static void lun_release(struct device *dev) |
3815 | { | |
7ca46b86 | 3816 | struct fsg_dev *fsg = dev_get_drvdata(dev); |
1da177e4 | 3817 | |
87c4252a | 3818 | kref_put(&fsg->ref, fsg_release); |
1da177e4 LT |
3819 | } |
3820 | ||
a353678d | 3821 | static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget) |
1da177e4 LT |
3822 | { |
3823 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
3824 | int i; | |
3825 | struct lun *curlun; | |
3826 | struct usb_request *req = fsg->ep0req; | |
3827 | ||
3828 | DBG(fsg, "unbind\n"); | |
3829 | clear_bit(REGISTERED, &fsg->atomic_bitflags); | |
3830 | ||
3831 | /* Unregister the sysfs attribute files and the LUNs */ | |
1da177e4 LT |
3832 | for (i = 0; i < fsg->nluns; ++i) { |
3833 | curlun = &fsg->luns[i]; | |
3834 | if (curlun->registered) { | |
3835 | device_remove_file(&curlun->dev, &dev_attr_ro); | |
3836 | device_remove_file(&curlun->dev, &dev_attr_file); | |
82a10a81 | 3837 | close_backing_file(curlun); |
1da177e4 | 3838 | device_unregister(&curlun->dev); |
1da177e4 LT |
3839 | curlun->registered = 0; |
3840 | } | |
3841 | } | |
3842 | ||
3843 | /* If the thread isn't already dead, tell it to exit now */ | |
3844 | if (fsg->state != FSG_STATE_TERMINATED) { | |
3845 | raise_exception(fsg, FSG_STATE_EXIT); | |
3846 | wait_for_completion(&fsg->thread_notifier); | |
3847 | ||
3848 | /* The cleanup routine waits for this completion also */ | |
3849 | complete(&fsg->thread_notifier); | |
3850 | } | |
3851 | ||
3852 | /* Free the data buffers */ | |
9d8bab58 DB |
3853 | for (i = 0; i < NUM_BUFFERS; ++i) |
3854 | kfree(fsg->buffhds[i].buf); | |
1da177e4 LT |
3855 | |
3856 | /* Free the request and buffer for endpoint 0 */ | |
3857 | if (req) { | |
9d8bab58 | 3858 | kfree(req->buf); |
1da177e4 LT |
3859 | usb_ep_free_request(fsg->ep0, req); |
3860 | } | |
3861 | ||
3862 | set_gadget_data(gadget, NULL); | |
3863 | } | |
3864 | ||
3865 | ||
3866 | static int __init check_parameters(struct fsg_dev *fsg) | |
3867 | { | |
3868 | int prot; | |
91e79c91 | 3869 | int gcnum; |
1da177e4 LT |
3870 | |
3871 | /* Store the default values */ | |
3872 | mod_data.transport_type = USB_PR_BULK; | |
3873 | mod_data.transport_name = "Bulk-only"; | |
3874 | mod_data.protocol_type = USB_SC_SCSI; | |
3875 | mod_data.protocol_name = "Transparent SCSI"; | |
3876 | ||
ce459ec1 AS |
3877 | /* Some peripheral controllers are known not to be able to |
3878 | * halt bulk endpoints correctly. If one of them is present, | |
3879 | * disable stalls. | |
3880 | */ | |
3881 | if (gadget_is_sh(fsg->gadget) || gadget_is_at91(fsg->gadget)) | |
1da177e4 LT |
3882 | mod_data.can_stall = 0; |
3883 | ||
3884 | if (mod_data.release == 0xffff) { // Parameter wasn't set | |
1da177e4 | 3885 | /* The sa1100 controller is not supported */ |
91e79c91 DB |
3886 | if (gadget_is_sa1100(fsg->gadget)) |
3887 | gcnum = -1; | |
3888 | else | |
3889 | gcnum = usb_gadget_controller_number(fsg->gadget); | |
3890 | if (gcnum >= 0) | |
3891 | mod_data.release = 0x0300 + gcnum; | |
1da177e4 | 3892 | else { |
b6c63937 | 3893 | WARNING(fsg, "controller '%s' not recognized\n", |
1da177e4 LT |
3894 | fsg->gadget->name); |
3895 | mod_data.release = 0x0399; | |
3896 | } | |
3897 | } | |
3898 | ||
3899 | prot = simple_strtol(mod_data.protocol_parm, NULL, 0); | |
3900 | ||
3901 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
3902 | if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) { | |
3903 | ; // Use default setting | |
3904 | } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) { | |
3905 | mod_data.transport_type = USB_PR_CB; | |
3906 | mod_data.transport_name = "Control-Bulk"; | |
3907 | } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) { | |
3908 | mod_data.transport_type = USB_PR_CBI; | |
3909 | mod_data.transport_name = "Control-Bulk-Interrupt"; | |
3910 | } else { | |
3911 | ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm); | |
3912 | return -EINVAL; | |
3913 | } | |
3914 | ||
3915 | if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 || | |
3916 | prot == USB_SC_SCSI) { | |
3917 | ; // Use default setting | |
3918 | } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 || | |
3919 | prot == USB_SC_RBC) { | |
3920 | mod_data.protocol_type = USB_SC_RBC; | |
3921 | mod_data.protocol_name = "RBC"; | |
3922 | } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 || | |
3923 | strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 || | |
3924 | prot == USB_SC_8020) { | |
3925 | mod_data.protocol_type = USB_SC_8020; | |
3926 | mod_data.protocol_name = "8020i (ATAPI)"; | |
3927 | } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 || | |
3928 | prot == USB_SC_QIC) { | |
3929 | mod_data.protocol_type = USB_SC_QIC; | |
3930 | mod_data.protocol_name = "QIC-157"; | |
3931 | } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 || | |
3932 | prot == USB_SC_UFI) { | |
3933 | mod_data.protocol_type = USB_SC_UFI; | |
3934 | mod_data.protocol_name = "UFI"; | |
3935 | } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 || | |
3936 | prot == USB_SC_8070) { | |
3937 | mod_data.protocol_type = USB_SC_8070; | |
3938 | mod_data.protocol_name = "8070i"; | |
3939 | } else { | |
3940 | ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm); | |
3941 | return -EINVAL; | |
3942 | } | |
3943 | ||
3944 | mod_data.buflen &= PAGE_CACHE_MASK; | |
3945 | if (mod_data.buflen <= 0) { | |
3946 | ERROR(fsg, "invalid buflen\n"); | |
3947 | return -ETOOSMALL; | |
3948 | } | |
3949 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
3950 | ||
3951 | return 0; | |
3952 | } | |
3953 | ||
3954 | ||
3955 | static int __init fsg_bind(struct usb_gadget *gadget) | |
3956 | { | |
3957 | struct fsg_dev *fsg = the_fsg; | |
3958 | int rc; | |
3959 | int i; | |
3960 | struct lun *curlun; | |
3961 | struct usb_ep *ep; | |
3962 | struct usb_request *req; | |
3963 | char *pathbuf, *p; | |
3964 | ||
3965 | fsg->gadget = gadget; | |
3966 | set_gadget_data(gadget, fsg); | |
3967 | fsg->ep0 = gadget->ep0; | |
3968 | fsg->ep0->driver_data = fsg; | |
3969 | ||
3970 | if ((rc = check_parameters(fsg)) != 0) | |
3971 | goto out; | |
3972 | ||
3973 | if (mod_data.removable) { // Enable the store_xxx attributes | |
12aae68a | 3974 | dev_attr_file.attr.mode = 0644; |
1da177e4 | 3975 | dev_attr_file.store = store_file; |
12aae68a AS |
3976 | if (!mod_data.cdrom) { |
3977 | dev_attr_ro.attr.mode = 0644; | |
3978 | dev_attr_ro.store = store_ro; | |
3979 | } | |
1da177e4 LT |
3980 | } |
3981 | ||
3982 | /* Find out how many LUNs there should be */ | |
3983 | i = mod_data.nluns; | |
3984 | if (i == 0) | |
2e806f67 | 3985 | i = max(mod_data.num_filenames, 1u); |
1da177e4 LT |
3986 | if (i > MAX_LUNS) { |
3987 | ERROR(fsg, "invalid number of LUNs: %d\n", i); | |
3988 | rc = -EINVAL; | |
3989 | goto out; | |
3990 | } | |
3991 | ||
3992 | /* Create the LUNs, open their backing files, and register the | |
3993 | * LUN devices in sysfs. */ | |
a922c687 | 3994 | fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL); |
1da177e4 LT |
3995 | if (!fsg->luns) { |
3996 | rc = -ENOMEM; | |
3997 | goto out; | |
3998 | } | |
1da177e4 LT |
3999 | fsg->nluns = i; |
4000 | ||
4001 | for (i = 0; i < fsg->nluns; ++i) { | |
4002 | curlun = &fsg->luns[i]; | |
aafe5bd6 | 4003 | curlun->ro = mod_data.ro[i]; |
12aae68a AS |
4004 | if (mod_data.cdrom) |
4005 | curlun->ro = 1; | |
2de9eaef | 4006 | curlun->dev.release = lun_release; |
1da177e4 LT |
4007 | curlun->dev.parent = &gadget->dev; |
4008 | curlun->dev.driver = &fsg_driver.driver; | |
4009 | dev_set_drvdata(&curlun->dev, fsg); | |
0031a06e KS |
4010 | dev_set_name(&curlun->dev,"%s-lun%d", |
4011 | dev_name(&gadget->dev), i); | |
1da177e4 | 4012 | |
2de9eaef | 4013 | if ((rc = device_register(&curlun->dev)) != 0) { |
1da177e4 | 4014 | INFO(fsg, "failed to register LUN%d: %d\n", i, rc); |
2de9eaef AS |
4015 | goto out; |
4016 | } | |
4017 | if ((rc = device_create_file(&curlun->dev, | |
4018 | &dev_attr_ro)) != 0 || | |
4019 | (rc = device_create_file(&curlun->dev, | |
4020 | &dev_attr_file)) != 0) { | |
4021 | device_unregister(&curlun->dev); | |
4022 | goto out; | |
1da177e4 | 4023 | } |
2de9eaef AS |
4024 | curlun->registered = 1; |
4025 | kref_get(&fsg->ref); | |
1da177e4 | 4026 | |
aafe5bd6 AS |
4027 | if (mod_data.file[i] && *mod_data.file[i]) { |
4028 | if ((rc = open_backing_file(curlun, | |
4029 | mod_data.file[i])) != 0) | |
1da177e4 LT |
4030 | goto out; |
4031 | } else if (!mod_data.removable) { | |
4032 | ERROR(fsg, "no file given for LUN%d\n", i); | |
4033 | rc = -EINVAL; | |
4034 | goto out; | |
4035 | } | |
4036 | } | |
4037 | ||
4038 | /* Find all the endpoints we will use */ | |
4039 | usb_ep_autoconfig_reset(gadget); | |
4040 | ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc); | |
4041 | if (!ep) | |
4042 | goto autoconf_fail; | |
4043 | ep->driver_data = fsg; // claim the endpoint | |
4044 | fsg->bulk_in = ep; | |
4045 | ||
4046 | ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc); | |
4047 | if (!ep) | |
4048 | goto autoconf_fail; | |
4049 | ep->driver_data = fsg; // claim the endpoint | |
4050 | fsg->bulk_out = ep; | |
4051 | ||
4052 | if (transport_is_cbi()) { | |
4053 | ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc); | |
4054 | if (!ep) | |
4055 | goto autoconf_fail; | |
4056 | ep->driver_data = fsg; // claim the endpoint | |
4057 | fsg->intr_in = ep; | |
4058 | } | |
4059 | ||
4060 | /* Fix up the descriptors */ | |
4061 | device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket; | |
4062 | device_desc.idVendor = cpu_to_le16(mod_data.vendor); | |
4063 | device_desc.idProduct = cpu_to_le16(mod_data.product); | |
4064 | device_desc.bcdDevice = cpu_to_le16(mod_data.release); | |
4065 | ||
4066 | i = (transport_is_cbi() ? 3 : 2); // Number of endpoints | |
4067 | intf_desc.bNumEndpoints = i; | |
4068 | intf_desc.bInterfaceSubClass = mod_data.protocol_type; | |
4069 | intf_desc.bInterfaceProtocol = mod_data.transport_type; | |
4070 | fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL; | |
4071 | ||
2e806f67 DB |
4072 | if (gadget_is_dualspeed(gadget)) { |
4073 | hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL; | |
1da177e4 | 4074 | |
2e806f67 DB |
4075 | /* Assume ep0 uses the same maxpacket value for both speeds */ |
4076 | dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket; | |
1da177e4 | 4077 | |
2e806f67 DB |
4078 | /* Assume endpoint addresses are the same for both speeds */ |
4079 | hs_bulk_in_desc.bEndpointAddress = | |
4080 | fs_bulk_in_desc.bEndpointAddress; | |
4081 | hs_bulk_out_desc.bEndpointAddress = | |
4082 | fs_bulk_out_desc.bEndpointAddress; | |
4083 | hs_intr_in_desc.bEndpointAddress = | |
4084 | fs_intr_in_desc.bEndpointAddress; | |
4085 | } | |
1da177e4 | 4086 | |
2e806f67 | 4087 | if (gadget_is_otg(gadget)) |
02036338 | 4088 | otg_desc.bmAttributes |= USB_OTG_HNP; |
1da177e4 LT |
4089 | |
4090 | rc = -ENOMEM; | |
4091 | ||
4092 | /* Allocate the request and buffer for endpoint 0 */ | |
4093 | fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL); | |
4094 | if (!req) | |
4095 | goto out; | |
9d8bab58 | 4096 | req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL); |
1da177e4 LT |
4097 | if (!req->buf) |
4098 | goto out; | |
4099 | req->complete = ep0_complete; | |
4100 | ||
4101 | /* Allocate the data buffers */ | |
4102 | for (i = 0; i < NUM_BUFFERS; ++i) { | |
4103 | struct fsg_buffhd *bh = &fsg->buffhds[i]; | |
4104 | ||
14cd5f8e AS |
4105 | /* Allocate for the bulk-in endpoint. We assume that |
4106 | * the buffer will also work with the bulk-out (and | |
4107 | * interrupt-in) endpoint. */ | |
9d8bab58 | 4108 | bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL); |
1da177e4 LT |
4109 | if (!bh->buf) |
4110 | goto out; | |
4111 | bh->next = bh + 1; | |
4112 | } | |
4113 | fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0]; | |
4114 | ||
4115 | /* This should reflect the actual gadget power source */ | |
4116 | usb_gadget_set_selfpowered(gadget); | |
4117 | ||
4118 | snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", | |
96b644bd | 4119 | init_utsname()->sysname, init_utsname()->release, |
1da177e4 LT |
4120 | gadget->name); |
4121 | ||
4122 | /* On a real device, serial[] would be loaded from permanent | |
4123 | * storage. We just encode it from the driver version string. */ | |
4124 | for (i = 0; i < sizeof(serial) - 2; i += 2) { | |
4125 | unsigned char c = DRIVER_VERSION[i / 2]; | |
4126 | ||
4127 | if (!c) | |
4128 | break; | |
4129 | sprintf(&serial[i], "%02X", c); | |
4130 | } | |
4131 | ||
22efcf4a AS |
4132 | fsg->thread_task = kthread_create(fsg_main_thread, fsg, |
4133 | "file-storage-gadget"); | |
4134 | if (IS_ERR(fsg->thread_task)) { | |
4135 | rc = PTR_ERR(fsg->thread_task); | |
1da177e4 | 4136 | goto out; |
22efcf4a | 4137 | } |
1da177e4 LT |
4138 | |
4139 | INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); | |
4140 | INFO(fsg, "Number of LUNs=%d\n", fsg->nluns); | |
4141 | ||
4142 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); | |
4143 | for (i = 0; i < fsg->nluns; ++i) { | |
4144 | curlun = &fsg->luns[i]; | |
4145 | if (backing_file_is_open(curlun)) { | |
4146 | p = NULL; | |
4147 | if (pathbuf) { | |
cf28b486 JB |
4148 | p = d_path(&curlun->filp->f_path, |
4149 | pathbuf, PATH_MAX); | |
1da177e4 LT |
4150 | if (IS_ERR(p)) |
4151 | p = NULL; | |
4152 | } | |
4153 | LINFO(curlun, "ro=%d, file: %s\n", | |
4154 | curlun->ro, (p ? p : "(error)")); | |
4155 | } | |
4156 | } | |
4157 | kfree(pathbuf); | |
4158 | ||
4159 | DBG(fsg, "transport=%s (x%02x)\n", | |
4160 | mod_data.transport_name, mod_data.transport_type); | |
4161 | DBG(fsg, "protocol=%s (x%02x)\n", | |
4162 | mod_data.protocol_name, mod_data.protocol_type); | |
4163 | DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n", | |
4164 | mod_data.vendor, mod_data.product, mod_data.release); | |
12aae68a | 4165 | DBG(fsg, "removable=%d, stall=%d, cdrom=%d, buflen=%u\n", |
1da177e4 | 4166 | mod_data.removable, mod_data.can_stall, |
12aae68a | 4167 | mod_data.cdrom, mod_data.buflen); |
ba25f9dc | 4168 | DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task)); |
a922c687 AS |
4169 | |
4170 | set_bit(REGISTERED, &fsg->atomic_bitflags); | |
4171 | ||
4172 | /* Tell the thread to start working */ | |
4173 | wake_up_process(fsg->thread_task); | |
1da177e4 LT |
4174 | return 0; |
4175 | ||
4176 | autoconf_fail: | |
4177 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); | |
4178 | rc = -ENOTSUPP; | |
4179 | ||
4180 | out: | |
4181 | fsg->state = FSG_STATE_TERMINATED; // The thread is dead | |
4182 | fsg_unbind(gadget); | |
889394b1 | 4183 | complete(&fsg->thread_notifier); |
1da177e4 LT |
4184 | return rc; |
4185 | } | |
4186 | ||
4187 | ||
4188 | /*-------------------------------------------------------------------------*/ | |
4189 | ||
4190 | static void fsg_suspend(struct usb_gadget *gadget) | |
4191 | { | |
4192 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
4193 | ||
4194 | DBG(fsg, "suspend\n"); | |
4195 | set_bit(SUSPENDED, &fsg->atomic_bitflags); | |
4196 | } | |
4197 | ||
4198 | static void fsg_resume(struct usb_gadget *gadget) | |
4199 | { | |
4200 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
4201 | ||
4202 | DBG(fsg, "resume\n"); | |
4203 | clear_bit(SUSPENDED, &fsg->atomic_bitflags); | |
4204 | } | |
4205 | ||
4206 | ||
4207 | /*-------------------------------------------------------------------------*/ | |
4208 | ||
4209 | static struct usb_gadget_driver fsg_driver = { | |
4210 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
4211 | .speed = USB_SPEED_HIGH, | |
4212 | #else | |
4213 | .speed = USB_SPEED_FULL, | |
4214 | #endif | |
4215 | .function = (char *) longname, | |
4216 | .bind = fsg_bind, | |
6bea476c | 4217 | .unbind = fsg_unbind, |
1da177e4 LT |
4218 | .disconnect = fsg_disconnect, |
4219 | .setup = fsg_setup, | |
4220 | .suspend = fsg_suspend, | |
4221 | .resume = fsg_resume, | |
4222 | ||
4223 | .driver = { | |
4224 | .name = (char *) shortname, | |
d0d5049f | 4225 | .owner = THIS_MODULE, |
1da177e4 LT |
4226 | // .release = ... |
4227 | // .suspend = ... | |
4228 | // .resume = ... | |
4229 | }, | |
4230 | }; | |
4231 | ||
4232 | ||
4233 | static int __init fsg_alloc(void) | |
4234 | { | |
4235 | struct fsg_dev *fsg; | |
4236 | ||
a922c687 | 4237 | fsg = kzalloc(sizeof *fsg, GFP_KERNEL); |
1da177e4 LT |
4238 | if (!fsg) |
4239 | return -ENOMEM; | |
1da177e4 LT |
4240 | spin_lock_init(&fsg->lock); |
4241 | init_rwsem(&fsg->filesem); | |
87c4252a | 4242 | kref_init(&fsg->ref); |
1da177e4 LT |
4243 | init_completion(&fsg->thread_notifier); |
4244 | ||
4245 | the_fsg = fsg; | |
4246 | return 0; | |
4247 | } | |
4248 | ||
4249 | ||
1da177e4 LT |
4250 | static int __init fsg_init(void) |
4251 | { | |
4252 | int rc; | |
4253 | struct fsg_dev *fsg; | |
4254 | ||
4255 | if ((rc = fsg_alloc()) != 0) | |
4256 | return rc; | |
4257 | fsg = the_fsg; | |
a922c687 | 4258 | if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) |
87c4252a | 4259 | kref_put(&fsg->ref, fsg_release); |
a922c687 | 4260 | return rc; |
1da177e4 LT |
4261 | } |
4262 | module_init(fsg_init); | |
4263 | ||
4264 | ||
4265 | static void __exit fsg_cleanup(void) | |
4266 | { | |
4267 | struct fsg_dev *fsg = the_fsg; | |
4268 | ||
4269 | /* Unregister the driver iff the thread hasn't already done so */ | |
4270 | if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) | |
4271 | usb_gadget_unregister_driver(&fsg_driver); | |
4272 | ||
4273 | /* Wait for the thread to finish up */ | |
4274 | wait_for_completion(&fsg->thread_notifier); | |
4275 | ||
87c4252a | 4276 | kref_put(&fsg->ref, fsg_release); |
1da177e4 LT |
4277 | } |
4278 | module_exit(fsg_cleanup); |