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Rename struct file->f_ep_lock
[deliverable/linux.git] / drivers / usb / gadget / file_storage.c
1 /*
2 * file_storage.c -- File-backed USB Storage Gadget, for USB development
3 *
4 * Copyright (C) 2003-2008 Alan Stern
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,
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.
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
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.
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
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.
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 *
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 *
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
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
100 * cdrom Default false, boolean for whether to emulate
101 * a CD-ROM drive
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)
112 *
113 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
114 * "removable", "luns", "stall", and "cdrom" options are available; default
115 * values are used for everything else.
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
122 * setting are not allowed when the medium is loaded or if CD-ROM emulation
123 * is being used.
124 *
125 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
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>.
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
229 /* #define VERBOSE_DEBUG */
230 /* #define DUMP_MSGS */
231
232
233 #include <linux/blkdev.h>
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>
241 #include <linux/kref.h>
242 #include <linux/kthread.h>
243 #include <linux/limits.h>
244 #include <linux/rwsem.h>
245 #include <linux/slab.h>
246 #include <linux/spinlock.h>
247 #include <linux/string.h>
248 #include <linux/freezer.h>
249 #include <linux/utsname.h>
250
251 #include <linux/usb/ch9.h>
252 #include <linux/usb/gadget.h>
253
254 #include "gadget_chips.h"
255
256
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
269 /*-------------------------------------------------------------------------*/
270
271 #define DRIVER_DESC "File-backed Storage Gadget"
272 #define DRIVER_NAME "g_file_storage"
273 #define DRIVER_VERSION "20 November 2008"
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
299 #define LDBG(lun,fmt,args...) \
300 dev_dbg(&(lun)->dev , fmt , ## args)
301 #define MDBG(fmt,args...) \
302 pr_debug(DRIVER_NAME ": " fmt , ## args)
303
304 #ifndef DEBUG
305 #undef VERBOSE_DEBUG
306 #undef DUMP_MSGS
307 #endif /* !DEBUG */
308
309 #ifdef VERBOSE_DEBUG
310 #define VLDBG LDBG
311 #else
312 #define VLDBG(lun,fmt,args...) \
313 do { } while (0)
314 #endif /* VERBOSE_DEBUG */
315
316 #define LERROR(lun,fmt,args...) \
317 dev_err(&(lun)->dev , fmt , ## args)
318 #define LWARN(lun,fmt,args...) \
319 dev_warn(&(lun)->dev , fmt , ## args)
320 #define LINFO(lun,fmt,args...) \
321 dev_info(&(lun)->dev , fmt , ## args)
322
323 #define MINFO(fmt,args...) \
324 pr_info(DRIVER_NAME ": " fmt , ## args)
325
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)
332 #define WARNING(d, fmt, args...) \
333 dev_warn(&(d)->gadget->dev , fmt , ## args)
334 #define INFO(d, fmt, args...) \
335 dev_info(&(d)->gadget->dev , fmt , ## args)
336
337
338 /*-------------------------------------------------------------------------*/
339
340 /* Encapsulate the module parameter settings */
341
342 #define MAX_LUNS 8
343
344 static struct {
345 char *file[MAX_LUNS];
346 int ro[MAX_LUNS];
347 unsigned int num_filenames;
348 unsigned int num_ros;
349 unsigned int nluns;
350
351 int removable;
352 int can_stall;
353 int cdrom;
354
355 char *transport_parm;
356 char *protocol_parm;
357 unsigned short vendor;
358 unsigned short product;
359 unsigned short release;
360 unsigned int buflen;
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,
371 .can_stall = 1,
372 .cdrom = 0,
373 .vendor = DRIVER_VENDOR_ID,
374 .product = DRIVER_PRODUCT_ID,
375 .release = 0xffff, // Use controller chip type
376 .buflen = 16384,
377 };
378
379
380 module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
381 S_IRUGO);
382 MODULE_PARM_DESC(file, "names of backing files or devices");
383
384 module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
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
393 module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
394 MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
395
396 module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO);
397 MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk");
398
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
423 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
424
425
426 /*-------------------------------------------------------------------------*/
427
428 /* SCSI device types */
429 #define TYPE_DISK 0x00
430 #define TYPE_CDROM 0x05
431
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
508 #define SC_READ_HEADER 0x44
509 #define SC_READ_TOC 0x43
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;
575 unsigned int info_valid : 1;
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
586 static struct lun *dev_to_lun(struct device *dev)
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;
607 enum fsg_buffer_state state;
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;
616 int inreq_busy;
617 struct usb_request *outreq;
618 int outreq_busy;
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
651 /* reference counting: wait until all LUNs are released */
652 struct kref ref;
653
654 struct usb_ep *ep0; // Handy copy of gadget->ep0
655 struct usb_request *ep0req; // For control responses
656 unsigned int ep0_req_tag;
657 const char *ep0req_name;
658
659 struct usb_request *intreq; // For interrupt responses
660 int intreq_busy;
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
679 #define IGNORE_BULK_OUT 1
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
690 int thread_wakeup_needed;
691 struct completion thread_notifier;
692 struct task_struct *thread_task;
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;
715 };
716
717 typedef void (*fsg_routine_t)(struct fsg_dev *);
718
719 static int exception_in_progress(struct fsg_dev *fsg)
720 {
721 return (fsg->state > FSG_STATE_IDLE);
722 }
723
724 /* Make bulk-out requests be divisible by the maxpacket size */
725 static void set_bulk_out_req_length(struct fsg_dev *fsg,
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);
741 static void close_all_backing_files(struct fsg_dev *fsg);
742
743
744 /*-------------------------------------------------------------------------*/
745
746 #ifdef DUMP_MSGS
747
748 static void dump_msg(struct fsg_dev *fsg, const char *label,
749 const u8 *buf, unsigned int length)
750 {
751 if (length < 512) {
752 DBG(fsg, "%s, length %u:\n", label, length);
753 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
754 16, 1, buf, length, 0);
755 }
756 }
757
758 static void dump_cdb(struct fsg_dev *fsg)
759 {}
760
761 #else
762
763 static void dump_msg(struct fsg_dev *fsg, const char *label,
764 const u8 *buf, unsigned int length)
765 {}
766
767 #ifdef VERBOSE_DEBUG
768
769 static void dump_cdb(struct fsg_dev *fsg)
770 {
771 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
772 16, 1, fsg->cmnd, fsg->cmnd_size, 0);
773 }
774
775 #else
776
777 static void dump_cdb(struct fsg_dev *fsg)
778 {}
779
780 #endif /* VERBOSE_DEBUG */
781 #endif /* DUMP_MSGS */
782
783
784 static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
785 {
786 const char *name;
787
788 if (ep == fsg->bulk_in)
789 name = "bulk-in";
790 else if (ep == fsg->bulk_out)
791 name = "bulk-out";
792 else
793 name = ep->name;
794 DBG(fsg, "%s set halt\n", name);
795 return usb_ep_set_halt(ep);
796 }
797
798
799 /*-------------------------------------------------------------------------*/
800
801 /* Routines for unaligned data access */
802
803 static u16 get_be16(u8 *buf)
804 {
805 return ((u16) buf[0] << 8) | ((u16) buf[1]);
806 }
807
808 static u32 get_be32(u8 *buf)
809 {
810 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
811 ((u32) buf[2] << 8) | ((u32) buf[3]);
812 }
813
814 static void put_be16(u8 *buf, u16 val)
815 {
816 buf[0] = val >> 8;
817 buf[1] = val;
818 }
819
820 static void put_be32(u8 *buf, u32 val)
821 {
822 buf[0] = val >> 24;
823 buf[1] = val >> 16;
824 buf[2] = val >> 8;
825 buf[3] = val & 0xff;
826 }
827
828
829 /*-------------------------------------------------------------------------*/
830
831 /*
832 * DESCRIPTORS ... most are static, but strings and (full) configuration
833 * descriptors are built on demand. Also the (static) config and interface
834 * descriptors are adjusted during fsg_bind().
835 */
836 #define STRING_MANUFACTURER 1
837 #define STRING_PRODUCT 2
838 #define STRING_SERIAL 3
839 #define STRING_CONFIG 4
840 #define STRING_INTERFACE 5
841
842 /* There is only one configuration. */
843 #define CONFIG_VALUE 1
844
845 static struct usb_device_descriptor
846 device_desc = {
847 .bLength = sizeof device_desc,
848 .bDescriptorType = USB_DT_DEVICE,
849
850 .bcdUSB = __constant_cpu_to_le16(0x0200),
851 .bDeviceClass = USB_CLASS_PER_INTERFACE,
852
853 /* The next three values can be overridden by module parameters */
854 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
855 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
856 .bcdDevice = __constant_cpu_to_le16(0xffff),
857
858 .iManufacturer = STRING_MANUFACTURER,
859 .iProduct = STRING_PRODUCT,
860 .iSerialNumber = STRING_SERIAL,
861 .bNumConfigurations = 1,
862 };
863
864 static struct usb_config_descriptor
865 config_desc = {
866 .bLength = sizeof config_desc,
867 .bDescriptorType = USB_DT_CONFIG,
868
869 /* wTotalLength computed by usb_gadget_config_buf() */
870 .bNumInterfaces = 1,
871 .bConfigurationValue = CONFIG_VALUE,
872 .iConfiguration = STRING_CONFIG,
873 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
874 .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
875 };
876
877 static struct usb_otg_descriptor
878 otg_desc = {
879 .bLength = sizeof(otg_desc),
880 .bDescriptorType = USB_DT_OTG,
881
882 .bmAttributes = USB_OTG_SRP,
883 };
884
885 /* There is only one interface. */
886
887 static struct usb_interface_descriptor
888 intf_desc = {
889 .bLength = sizeof intf_desc,
890 .bDescriptorType = USB_DT_INTERFACE,
891
892 .bNumEndpoints = 2, // Adjusted during fsg_bind()
893 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
894 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
895 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
896 .iInterface = STRING_INTERFACE,
897 };
898
899 /* Three full-speed endpoint descriptors: bulk-in, bulk-out,
900 * and interrupt-in. */
901
902 static struct usb_endpoint_descriptor
903 fs_bulk_in_desc = {
904 .bLength = USB_DT_ENDPOINT_SIZE,
905 .bDescriptorType = USB_DT_ENDPOINT,
906
907 .bEndpointAddress = USB_DIR_IN,
908 .bmAttributes = USB_ENDPOINT_XFER_BULK,
909 /* wMaxPacketSize set by autoconfiguration */
910 };
911
912 static struct usb_endpoint_descriptor
913 fs_bulk_out_desc = {
914 .bLength = USB_DT_ENDPOINT_SIZE,
915 .bDescriptorType = USB_DT_ENDPOINT,
916
917 .bEndpointAddress = USB_DIR_OUT,
918 .bmAttributes = USB_ENDPOINT_XFER_BULK,
919 /* wMaxPacketSize set by autoconfiguration */
920 };
921
922 static struct usb_endpoint_descriptor
923 fs_intr_in_desc = {
924 .bLength = USB_DT_ENDPOINT_SIZE,
925 .bDescriptorType = USB_DT_ENDPOINT,
926
927 .bEndpointAddress = USB_DIR_IN,
928 .bmAttributes = USB_ENDPOINT_XFER_INT,
929 .wMaxPacketSize = __constant_cpu_to_le16(2),
930 .bInterval = 32, // frames -> 32 ms
931 };
932
933 static const struct usb_descriptor_header *fs_function[] = {
934 (struct usb_descriptor_header *) &otg_desc,
935 (struct usb_descriptor_header *) &intf_desc,
936 (struct usb_descriptor_header *) &fs_bulk_in_desc,
937 (struct usb_descriptor_header *) &fs_bulk_out_desc,
938 (struct usb_descriptor_header *) &fs_intr_in_desc,
939 NULL,
940 };
941 #define FS_FUNCTION_PRE_EP_ENTRIES 2
942
943
944 /*
945 * USB 2.0 devices need to expose both high speed and full speed
946 * descriptors, unless they only run at full speed.
947 *
948 * That means alternate endpoint descriptors (bigger packets)
949 * and a "device qualifier" ... plus more construction options
950 * for the config descriptor.
951 */
952 static struct usb_qualifier_descriptor
953 dev_qualifier = {
954 .bLength = sizeof dev_qualifier,
955 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
956
957 .bcdUSB = __constant_cpu_to_le16(0x0200),
958 .bDeviceClass = USB_CLASS_PER_INTERFACE,
959
960 .bNumConfigurations = 1,
961 };
962
963 static struct usb_endpoint_descriptor
964 hs_bulk_in_desc = {
965 .bLength = USB_DT_ENDPOINT_SIZE,
966 .bDescriptorType = USB_DT_ENDPOINT,
967
968 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
969 .bmAttributes = USB_ENDPOINT_XFER_BULK,
970 .wMaxPacketSize = __constant_cpu_to_le16(512),
971 };
972
973 static struct usb_endpoint_descriptor
974 hs_bulk_out_desc = {
975 .bLength = USB_DT_ENDPOINT_SIZE,
976 .bDescriptorType = USB_DT_ENDPOINT,
977
978 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
979 .bmAttributes = USB_ENDPOINT_XFER_BULK,
980 .wMaxPacketSize = __constant_cpu_to_le16(512),
981 .bInterval = 1, // NAK every 1 uframe
982 };
983
984 static struct usb_endpoint_descriptor
985 hs_intr_in_desc = {
986 .bLength = USB_DT_ENDPOINT_SIZE,
987 .bDescriptorType = USB_DT_ENDPOINT,
988
989 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
990 .bmAttributes = USB_ENDPOINT_XFER_INT,
991 .wMaxPacketSize = __constant_cpu_to_le16(2),
992 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
993 };
994
995 static const struct usb_descriptor_header *hs_function[] = {
996 (struct usb_descriptor_header *) &otg_desc,
997 (struct usb_descriptor_header *) &intf_desc,
998 (struct usb_descriptor_header *) &hs_bulk_in_desc,
999 (struct usb_descriptor_header *) &hs_bulk_out_desc,
1000 (struct usb_descriptor_header *) &hs_intr_in_desc,
1001 NULL,
1002 };
1003 #define HS_FUNCTION_PRE_EP_ENTRIES 2
1004
1005 /* Maxpacket and other transfer characteristics vary by speed. */
1006 static struct usb_endpoint_descriptor *
1007 ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
1008 struct usb_endpoint_descriptor *hs)
1009 {
1010 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
1011 return hs;
1012 return fs;
1013 }
1014
1015
1016 /* The CBI specification limits the serial string to 12 uppercase hexadecimal
1017 * characters. */
1018 static char manufacturer[64];
1019 static char serial[13];
1020
1021 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1022 static struct usb_string strings[] = {
1023 {STRING_MANUFACTURER, manufacturer},
1024 {STRING_PRODUCT, longname},
1025 {STRING_SERIAL, serial},
1026 {STRING_CONFIG, "Self-powered"},
1027 {STRING_INTERFACE, "Mass Storage"},
1028 {}
1029 };
1030
1031 static struct usb_gadget_strings stringtab = {
1032 .language = 0x0409, // en-us
1033 .strings = strings,
1034 };
1035
1036
1037 /*
1038 * Config descriptors must agree with the code that sets configurations
1039 * and with code managing interfaces and their altsettings. They must
1040 * also handle different speeds and other-speed requests.
1041 */
1042 static int populate_config_buf(struct usb_gadget *gadget,
1043 u8 *buf, u8 type, unsigned index)
1044 {
1045 enum usb_device_speed speed = gadget->speed;
1046 int len;
1047 const struct usb_descriptor_header **function;
1048
1049 if (index > 0)
1050 return -EINVAL;
1051
1052 if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG)
1053 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1054 if (gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH)
1055 function = hs_function;
1056 else
1057 function = fs_function;
1058
1059 /* for now, don't advertise srp-only devices */
1060 if (!gadget_is_otg(gadget))
1061 function++;
1062
1063 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1064 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1065 return len;
1066 }
1067
1068
1069 /*-------------------------------------------------------------------------*/
1070
1071 /* These routines may be called in process context or in_irq */
1072
1073 /* Caller must hold fsg->lock */
1074 static void wakeup_thread(struct fsg_dev *fsg)
1075 {
1076 /* Tell the main thread that something has happened */
1077 fsg->thread_wakeup_needed = 1;
1078 if (fsg->thread_task)
1079 wake_up_process(fsg->thread_task);
1080 }
1081
1082
1083 static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1084 {
1085 unsigned long flags;
1086
1087 /* Do nothing if a higher-priority exception is already in progress.
1088 * If a lower-or-equal priority exception is in progress, preempt it
1089 * and notify the main thread by sending it a signal. */
1090 spin_lock_irqsave(&fsg->lock, flags);
1091 if (fsg->state <= new_state) {
1092 fsg->exception_req_tag = fsg->ep0_req_tag;
1093 fsg->state = new_state;
1094 if (fsg->thread_task)
1095 send_sig_info(SIGUSR1, SEND_SIG_FORCED,
1096 fsg->thread_task);
1097 }
1098 spin_unlock_irqrestore(&fsg->lock, flags);
1099 }
1100
1101
1102 /*-------------------------------------------------------------------------*/
1103
1104 /* The disconnect callback and ep0 routines. These always run in_irq,
1105 * except that ep0_queue() is called in the main thread to acknowledge
1106 * completion of various requests: set config, set interface, and
1107 * Bulk-only device reset. */
1108
1109 static void fsg_disconnect(struct usb_gadget *gadget)
1110 {
1111 struct fsg_dev *fsg = get_gadget_data(gadget);
1112
1113 DBG(fsg, "disconnect or port reset\n");
1114 raise_exception(fsg, FSG_STATE_DISCONNECT);
1115 }
1116
1117
1118 static int ep0_queue(struct fsg_dev *fsg)
1119 {
1120 int rc;
1121
1122 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1123 if (rc != 0 && rc != -ESHUTDOWN) {
1124
1125 /* We can't do much more than wait for a reset */
1126 WARNING(fsg, "error in submission: %s --> %d\n",
1127 fsg->ep0->name, rc);
1128 }
1129 return rc;
1130 }
1131
1132 static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1133 {
1134 struct fsg_dev *fsg = ep->driver_data;
1135
1136 if (req->actual > 0)
1137 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1138 if (req->status || req->actual != req->length)
1139 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1140 req->status, req->actual, req->length);
1141 if (req->status == -ECONNRESET) // Request was cancelled
1142 usb_ep_fifo_flush(ep);
1143
1144 if (req->status == 0 && req->context)
1145 ((fsg_routine_t) (req->context))(fsg);
1146 }
1147
1148
1149 /*-------------------------------------------------------------------------*/
1150
1151 /* Bulk and interrupt endpoint completion handlers.
1152 * These always run in_irq. */
1153
1154 static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1155 {
1156 struct fsg_dev *fsg = ep->driver_data;
1157 struct fsg_buffhd *bh = req->context;
1158
1159 if (req->status || req->actual != req->length)
1160 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1161 req->status, req->actual, req->length);
1162 if (req->status == -ECONNRESET) // Request was cancelled
1163 usb_ep_fifo_flush(ep);
1164
1165 /* Hold the lock while we update the request and buffer states */
1166 smp_wmb();
1167 spin_lock(&fsg->lock);
1168 bh->inreq_busy = 0;
1169 bh->state = BUF_STATE_EMPTY;
1170 wakeup_thread(fsg);
1171 spin_unlock(&fsg->lock);
1172 }
1173
1174 static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1175 {
1176 struct fsg_dev *fsg = ep->driver_data;
1177 struct fsg_buffhd *bh = req->context;
1178
1179 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1180 if (req->status || req->actual != bh->bulk_out_intended_length)
1181 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1182 req->status, req->actual,
1183 bh->bulk_out_intended_length);
1184 if (req->status == -ECONNRESET) // Request was cancelled
1185 usb_ep_fifo_flush(ep);
1186
1187 /* Hold the lock while we update the request and buffer states */
1188 smp_wmb();
1189 spin_lock(&fsg->lock);
1190 bh->outreq_busy = 0;
1191 bh->state = BUF_STATE_FULL;
1192 wakeup_thread(fsg);
1193 spin_unlock(&fsg->lock);
1194 }
1195
1196
1197 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1198 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1199 {
1200 struct fsg_dev *fsg = ep->driver_data;
1201 struct fsg_buffhd *bh = req->context;
1202
1203 if (req->status || req->actual != req->length)
1204 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1205 req->status, req->actual, req->length);
1206 if (req->status == -ECONNRESET) // Request was cancelled
1207 usb_ep_fifo_flush(ep);
1208
1209 /* Hold the lock while we update the request and buffer states */
1210 smp_wmb();
1211 spin_lock(&fsg->lock);
1212 fsg->intreq_busy = 0;
1213 bh->state = BUF_STATE_EMPTY;
1214 wakeup_thread(fsg);
1215 spin_unlock(&fsg->lock);
1216 }
1217
1218 #else
1219 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1220 {}
1221 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1222
1223
1224 /*-------------------------------------------------------------------------*/
1225
1226 /* Ep0 class-specific handlers. These always run in_irq. */
1227
1228 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1229 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1230 {
1231 struct usb_request *req = fsg->ep0req;
1232 static u8 cbi_reset_cmnd[6] = {
1233 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1234
1235 /* Error in command transfer? */
1236 if (req->status || req->length != req->actual ||
1237 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1238
1239 /* Not all controllers allow a protocol stall after
1240 * receiving control-out data, but we'll try anyway. */
1241 fsg_set_halt(fsg, fsg->ep0);
1242 return; // Wait for reset
1243 }
1244
1245 /* Is it the special reset command? */
1246 if (req->actual >= sizeof cbi_reset_cmnd &&
1247 memcmp(req->buf, cbi_reset_cmnd,
1248 sizeof cbi_reset_cmnd) == 0) {
1249
1250 /* Raise an exception to stop the current operation
1251 * and reinitialize our state. */
1252 DBG(fsg, "cbi reset request\n");
1253 raise_exception(fsg, FSG_STATE_RESET);
1254 return;
1255 }
1256
1257 VDBG(fsg, "CB[I] accept device-specific command\n");
1258 spin_lock(&fsg->lock);
1259
1260 /* Save the command for later */
1261 if (fsg->cbbuf_cmnd_size)
1262 WARNING(fsg, "CB[I] overwriting previous command\n");
1263 fsg->cbbuf_cmnd_size = req->actual;
1264 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1265
1266 wakeup_thread(fsg);
1267 spin_unlock(&fsg->lock);
1268 }
1269
1270 #else
1271 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1272 {}
1273 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1274
1275
1276 static int class_setup_req(struct fsg_dev *fsg,
1277 const struct usb_ctrlrequest *ctrl)
1278 {
1279 struct usb_request *req = fsg->ep0req;
1280 int value = -EOPNOTSUPP;
1281 u16 w_index = le16_to_cpu(ctrl->wIndex);
1282 u16 w_value = le16_to_cpu(ctrl->wValue);
1283 u16 w_length = le16_to_cpu(ctrl->wLength);
1284
1285 if (!fsg->config)
1286 return value;
1287
1288 /* Handle Bulk-only class-specific requests */
1289 if (transport_is_bbb()) {
1290 switch (ctrl->bRequest) {
1291
1292 case USB_BULK_RESET_REQUEST:
1293 if (ctrl->bRequestType != (USB_DIR_OUT |
1294 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1295 break;
1296 if (w_index != 0 || w_value != 0) {
1297 value = -EDOM;
1298 break;
1299 }
1300
1301 /* Raise an exception to stop the current operation
1302 * and reinitialize our state. */
1303 DBG(fsg, "bulk reset request\n");
1304 raise_exception(fsg, FSG_STATE_RESET);
1305 value = DELAYED_STATUS;
1306 break;
1307
1308 case USB_BULK_GET_MAX_LUN_REQUEST:
1309 if (ctrl->bRequestType != (USB_DIR_IN |
1310 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1311 break;
1312 if (w_index != 0 || w_value != 0) {
1313 value = -EDOM;
1314 break;
1315 }
1316 VDBG(fsg, "get max LUN\n");
1317 *(u8 *) req->buf = fsg->nluns - 1;
1318 value = 1;
1319 break;
1320 }
1321 }
1322
1323 /* Handle CBI class-specific requests */
1324 else {
1325 switch (ctrl->bRequest) {
1326
1327 case USB_CBI_ADSC_REQUEST:
1328 if (ctrl->bRequestType != (USB_DIR_OUT |
1329 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1330 break;
1331 if (w_index != 0 || w_value != 0) {
1332 value = -EDOM;
1333 break;
1334 }
1335 if (w_length > MAX_COMMAND_SIZE) {
1336 value = -EOVERFLOW;
1337 break;
1338 }
1339 value = w_length;
1340 fsg->ep0req->context = received_cbi_adsc;
1341 break;
1342 }
1343 }
1344
1345 if (value == -EOPNOTSUPP)
1346 VDBG(fsg,
1347 "unknown class-specific control req "
1348 "%02x.%02x v%04x i%04x l%u\n",
1349 ctrl->bRequestType, ctrl->bRequest,
1350 le16_to_cpu(ctrl->wValue), w_index, w_length);
1351 return value;
1352 }
1353
1354
1355 /*-------------------------------------------------------------------------*/
1356
1357 /* Ep0 standard request handlers. These always run in_irq. */
1358
1359 static int standard_setup_req(struct fsg_dev *fsg,
1360 const struct usb_ctrlrequest *ctrl)
1361 {
1362 struct usb_request *req = fsg->ep0req;
1363 int value = -EOPNOTSUPP;
1364 u16 w_index = le16_to_cpu(ctrl->wIndex);
1365 u16 w_value = le16_to_cpu(ctrl->wValue);
1366
1367 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1368 * but config change events will also reconfigure hardware. */
1369 switch (ctrl->bRequest) {
1370
1371 case USB_REQ_GET_DESCRIPTOR:
1372 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1373 USB_RECIP_DEVICE))
1374 break;
1375 switch (w_value >> 8) {
1376
1377 case USB_DT_DEVICE:
1378 VDBG(fsg, "get device descriptor\n");
1379 value = sizeof device_desc;
1380 memcpy(req->buf, &device_desc, value);
1381 break;
1382 case USB_DT_DEVICE_QUALIFIER:
1383 VDBG(fsg, "get device qualifier\n");
1384 if (!gadget_is_dualspeed(fsg->gadget))
1385 break;
1386 value = sizeof dev_qualifier;
1387 memcpy(req->buf, &dev_qualifier, value);
1388 break;
1389
1390 case USB_DT_OTHER_SPEED_CONFIG:
1391 VDBG(fsg, "get other-speed config descriptor\n");
1392 if (!gadget_is_dualspeed(fsg->gadget))
1393 break;
1394 goto get_config;
1395 case USB_DT_CONFIG:
1396 VDBG(fsg, "get configuration descriptor\n");
1397 get_config:
1398 value = populate_config_buf(fsg->gadget,
1399 req->buf,
1400 w_value >> 8,
1401 w_value & 0xff);
1402 break;
1403
1404 case USB_DT_STRING:
1405 VDBG(fsg, "get string descriptor\n");
1406
1407 /* wIndex == language code */
1408 value = usb_gadget_get_string(&stringtab,
1409 w_value & 0xff, req->buf);
1410 break;
1411 }
1412 break;
1413
1414 /* One config, two speeds */
1415 case USB_REQ_SET_CONFIGURATION:
1416 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1417 USB_RECIP_DEVICE))
1418 break;
1419 VDBG(fsg, "set configuration\n");
1420 if (w_value == CONFIG_VALUE || w_value == 0) {
1421 fsg->new_config = w_value;
1422
1423 /* Raise an exception to wipe out previous transaction
1424 * state (queued bufs, etc) and set the new config. */
1425 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1426 value = DELAYED_STATUS;
1427 }
1428 break;
1429 case USB_REQ_GET_CONFIGURATION:
1430 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1431 USB_RECIP_DEVICE))
1432 break;
1433 VDBG(fsg, "get configuration\n");
1434 *(u8 *) req->buf = fsg->config;
1435 value = 1;
1436 break;
1437
1438 case USB_REQ_SET_INTERFACE:
1439 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1440 USB_RECIP_INTERFACE))
1441 break;
1442 if (fsg->config && w_index == 0) {
1443
1444 /* Raise an exception to wipe out previous transaction
1445 * state (queued bufs, etc) and install the new
1446 * interface altsetting. */
1447 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1448 value = DELAYED_STATUS;
1449 }
1450 break;
1451 case USB_REQ_GET_INTERFACE:
1452 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1453 USB_RECIP_INTERFACE))
1454 break;
1455 if (!fsg->config)
1456 break;
1457 if (w_index != 0) {
1458 value = -EDOM;
1459 break;
1460 }
1461 VDBG(fsg, "get interface\n");
1462 *(u8 *) req->buf = 0;
1463 value = 1;
1464 break;
1465
1466 default:
1467 VDBG(fsg,
1468 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1469 ctrl->bRequestType, ctrl->bRequest,
1470 w_value, w_index, le16_to_cpu(ctrl->wLength));
1471 }
1472
1473 return value;
1474 }
1475
1476
1477 static int fsg_setup(struct usb_gadget *gadget,
1478 const struct usb_ctrlrequest *ctrl)
1479 {
1480 struct fsg_dev *fsg = get_gadget_data(gadget);
1481 int rc;
1482 int w_length = le16_to_cpu(ctrl->wLength);
1483
1484 ++fsg->ep0_req_tag; // Record arrival of a new request
1485 fsg->ep0req->context = NULL;
1486 fsg->ep0req->length = 0;
1487 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1488
1489 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1490 rc = class_setup_req(fsg, ctrl);
1491 else
1492 rc = standard_setup_req(fsg, ctrl);
1493
1494 /* Respond with data/status or defer until later? */
1495 if (rc >= 0 && rc != DELAYED_STATUS) {
1496 rc = min(rc, w_length);
1497 fsg->ep0req->length = rc;
1498 fsg->ep0req->zero = rc < w_length;
1499 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1500 "ep0-in" : "ep0-out");
1501 rc = ep0_queue(fsg);
1502 }
1503
1504 /* Device either stalls (rc < 0) or reports success */
1505 return rc;
1506 }
1507
1508
1509 /*-------------------------------------------------------------------------*/
1510
1511 /* All the following routines run in process context */
1512
1513
1514 /* Use this for bulk or interrupt transfers, not ep0 */
1515 static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1516 struct usb_request *req, int *pbusy,
1517 enum fsg_buffer_state *state)
1518 {
1519 int rc;
1520
1521 if (ep == fsg->bulk_in)
1522 dump_msg(fsg, "bulk-in", req->buf, req->length);
1523 else if (ep == fsg->intr_in)
1524 dump_msg(fsg, "intr-in", req->buf, req->length);
1525
1526 spin_lock_irq(&fsg->lock);
1527 *pbusy = 1;
1528 *state = BUF_STATE_BUSY;
1529 spin_unlock_irq(&fsg->lock);
1530 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1531 if (rc != 0) {
1532 *pbusy = 0;
1533 *state = BUF_STATE_EMPTY;
1534
1535 /* We can't do much more than wait for a reset */
1536
1537 /* Note: currently the net2280 driver fails zero-length
1538 * submissions if DMA is enabled. */
1539 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1540 req->length == 0))
1541 WARNING(fsg, "error in submission: %s --> %d\n",
1542 ep->name, rc);
1543 }
1544 }
1545
1546
1547 static int sleep_thread(struct fsg_dev *fsg)
1548 {
1549 int rc = 0;
1550
1551 /* Wait until a signal arrives or we are woken up */
1552 for (;;) {
1553 try_to_freeze();
1554 set_current_state(TASK_INTERRUPTIBLE);
1555 if (signal_pending(current)) {
1556 rc = -EINTR;
1557 break;
1558 }
1559 if (fsg->thread_wakeup_needed)
1560 break;
1561 schedule();
1562 }
1563 __set_current_state(TASK_RUNNING);
1564 fsg->thread_wakeup_needed = 0;
1565 return rc;
1566 }
1567
1568
1569 /*-------------------------------------------------------------------------*/
1570
1571 static int do_read(struct fsg_dev *fsg)
1572 {
1573 struct lun *curlun = fsg->curlun;
1574 u32 lba;
1575 struct fsg_buffhd *bh;
1576 int rc;
1577 u32 amount_left;
1578 loff_t file_offset, file_offset_tmp;
1579 unsigned int amount;
1580 unsigned int partial_page;
1581 ssize_t nread;
1582
1583 /* Get the starting Logical Block Address and check that it's
1584 * not too big */
1585 if (fsg->cmnd[0] == SC_READ_6)
1586 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1587 else {
1588 lba = get_be32(&fsg->cmnd[2]);
1589
1590 /* We allow DPO (Disable Page Out = don't save data in the
1591 * cache) and FUA (Force Unit Access = don't read from the
1592 * cache), but we don't implement them. */
1593 if ((fsg->cmnd[1] & ~0x18) != 0) {
1594 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1595 return -EINVAL;
1596 }
1597 }
1598 if (lba >= curlun->num_sectors) {
1599 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1600 return -EINVAL;
1601 }
1602 file_offset = ((loff_t) lba) << 9;
1603
1604 /* Carry out the file reads */
1605 amount_left = fsg->data_size_from_cmnd;
1606 if (unlikely(amount_left == 0))
1607 return -EIO; // No default reply
1608
1609 for (;;) {
1610
1611 /* Figure out how much we need to read:
1612 * Try to read the remaining amount.
1613 * But don't read more than the buffer size.
1614 * And don't try to read past the end of the file.
1615 * Finally, if we're not at a page boundary, don't read past
1616 * the next page.
1617 * If this means reading 0 then we were asked to read past
1618 * the end of file. */
1619 amount = min((unsigned int) amount_left, mod_data.buflen);
1620 amount = min((loff_t) amount,
1621 curlun->file_length - file_offset);
1622 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1623 if (partial_page > 0)
1624 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1625 partial_page);
1626
1627 /* Wait for the next buffer to become available */
1628 bh = fsg->next_buffhd_to_fill;
1629 while (bh->state != BUF_STATE_EMPTY) {
1630 rc = sleep_thread(fsg);
1631 if (rc)
1632 return rc;
1633 }
1634
1635 /* If we were asked to read past the end of file,
1636 * end with an empty buffer. */
1637 if (amount == 0) {
1638 curlun->sense_data =
1639 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1640 curlun->sense_data_info = file_offset >> 9;
1641 curlun->info_valid = 1;
1642 bh->inreq->length = 0;
1643 bh->state = BUF_STATE_FULL;
1644 break;
1645 }
1646
1647 /* Perform the read */
1648 file_offset_tmp = file_offset;
1649 nread = vfs_read(curlun->filp,
1650 (char __user *) bh->buf,
1651 amount, &file_offset_tmp);
1652 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1653 (unsigned long long) file_offset,
1654 (int) nread);
1655 if (signal_pending(current))
1656 return -EINTR;
1657
1658 if (nread < 0) {
1659 LDBG(curlun, "error in file read: %d\n",
1660 (int) nread);
1661 nread = 0;
1662 } else if (nread < amount) {
1663 LDBG(curlun, "partial file read: %d/%u\n",
1664 (int) nread, amount);
1665 nread -= (nread & 511); // Round down to a block
1666 }
1667 file_offset += nread;
1668 amount_left -= nread;
1669 fsg->residue -= nread;
1670 bh->inreq->length = nread;
1671 bh->state = BUF_STATE_FULL;
1672
1673 /* If an error occurred, report it and its position */
1674 if (nread < amount) {
1675 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1676 curlun->sense_data_info = file_offset >> 9;
1677 curlun->info_valid = 1;
1678 break;
1679 }
1680
1681 if (amount_left == 0)
1682 break; // No more left to read
1683
1684 /* Send this buffer and go read some more */
1685 bh->inreq->zero = 0;
1686 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1687 &bh->inreq_busy, &bh->state);
1688 fsg->next_buffhd_to_fill = bh->next;
1689 }
1690
1691 return -EIO; // No default reply
1692 }
1693
1694
1695 /*-------------------------------------------------------------------------*/
1696
1697 static int do_write(struct fsg_dev *fsg)
1698 {
1699 struct lun *curlun = fsg->curlun;
1700 u32 lba;
1701 struct fsg_buffhd *bh;
1702 int get_some_more;
1703 u32 amount_left_to_req, amount_left_to_write;
1704 loff_t usb_offset, file_offset, file_offset_tmp;
1705 unsigned int amount;
1706 unsigned int partial_page;
1707 ssize_t nwritten;
1708 int rc;
1709
1710 if (curlun->ro) {
1711 curlun->sense_data = SS_WRITE_PROTECTED;
1712 return -EINVAL;
1713 }
1714 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1715
1716 /* Get the starting Logical Block Address and check that it's
1717 * not too big */
1718 if (fsg->cmnd[0] == SC_WRITE_6)
1719 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1720 else {
1721 lba = get_be32(&fsg->cmnd[2]);
1722
1723 /* We allow DPO (Disable Page Out = don't save data in the
1724 * cache) and FUA (Force Unit Access = write directly to the
1725 * medium). We don't implement DPO; we implement FUA by
1726 * performing synchronous output. */
1727 if ((fsg->cmnd[1] & ~0x18) != 0) {
1728 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1729 return -EINVAL;
1730 }
1731 if (fsg->cmnd[1] & 0x08) // FUA
1732 curlun->filp->f_flags |= O_SYNC;
1733 }
1734 if (lba >= curlun->num_sectors) {
1735 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1736 return -EINVAL;
1737 }
1738
1739 /* Carry out the file writes */
1740 get_some_more = 1;
1741 file_offset = usb_offset = ((loff_t) lba) << 9;
1742 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1743
1744 while (amount_left_to_write > 0) {
1745
1746 /* Queue a request for more data from the host */
1747 bh = fsg->next_buffhd_to_fill;
1748 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1749
1750 /* Figure out how much we want to get:
1751 * Try to get the remaining amount.
1752 * But don't get more than the buffer size.
1753 * And don't try to go past the end of the file.
1754 * If we're not at a page boundary,
1755 * don't go past the next page.
1756 * If this means getting 0, then we were asked
1757 * to write past the end of file.
1758 * Finally, round down to a block boundary. */
1759 amount = min(amount_left_to_req, mod_data.buflen);
1760 amount = min((loff_t) amount, curlun->file_length -
1761 usb_offset);
1762 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1763 if (partial_page > 0)
1764 amount = min(amount,
1765 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1766
1767 if (amount == 0) {
1768 get_some_more = 0;
1769 curlun->sense_data =
1770 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1771 curlun->sense_data_info = usb_offset >> 9;
1772 curlun->info_valid = 1;
1773 continue;
1774 }
1775 amount -= (amount & 511);
1776 if (amount == 0) {
1777
1778 /* Why were we were asked to transfer a
1779 * partial block? */
1780 get_some_more = 0;
1781 continue;
1782 }
1783
1784 /* Get the next buffer */
1785 usb_offset += amount;
1786 fsg->usb_amount_left -= amount;
1787 amount_left_to_req -= amount;
1788 if (amount_left_to_req == 0)
1789 get_some_more = 0;
1790
1791 /* amount is always divisible by 512, hence by
1792 * the bulk-out maxpacket size */
1793 bh->outreq->length = bh->bulk_out_intended_length =
1794 amount;
1795 bh->outreq->short_not_ok = 1;
1796 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1797 &bh->outreq_busy, &bh->state);
1798 fsg->next_buffhd_to_fill = bh->next;
1799 continue;
1800 }
1801
1802 /* Write the received data to the backing file */
1803 bh = fsg->next_buffhd_to_drain;
1804 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1805 break; // We stopped early
1806 if (bh->state == BUF_STATE_FULL) {
1807 smp_rmb();
1808 fsg->next_buffhd_to_drain = bh->next;
1809 bh->state = BUF_STATE_EMPTY;
1810
1811 /* Did something go wrong with the transfer? */
1812 if (bh->outreq->status != 0) {
1813 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1814 curlun->sense_data_info = file_offset >> 9;
1815 curlun->info_valid = 1;
1816 break;
1817 }
1818
1819 amount = bh->outreq->actual;
1820 if (curlun->file_length - file_offset < amount) {
1821 LERROR(curlun,
1822 "write %u @ %llu beyond end %llu\n",
1823 amount, (unsigned long long) file_offset,
1824 (unsigned long long) curlun->file_length);
1825 amount = curlun->file_length - file_offset;
1826 }
1827
1828 /* Perform the write */
1829 file_offset_tmp = file_offset;
1830 nwritten = vfs_write(curlun->filp,
1831 (char __user *) bh->buf,
1832 amount, &file_offset_tmp);
1833 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1834 (unsigned long long) file_offset,
1835 (int) nwritten);
1836 if (signal_pending(current))
1837 return -EINTR; // Interrupted!
1838
1839 if (nwritten < 0) {
1840 LDBG(curlun, "error in file write: %d\n",
1841 (int) nwritten);
1842 nwritten = 0;
1843 } else if (nwritten < amount) {
1844 LDBG(curlun, "partial file write: %d/%u\n",
1845 (int) nwritten, amount);
1846 nwritten -= (nwritten & 511);
1847 // Round down to a block
1848 }
1849 file_offset += nwritten;
1850 amount_left_to_write -= nwritten;
1851 fsg->residue -= nwritten;
1852
1853 /* If an error occurred, report it and its position */
1854 if (nwritten < amount) {
1855 curlun->sense_data = SS_WRITE_ERROR;
1856 curlun->sense_data_info = file_offset >> 9;
1857 curlun->info_valid = 1;
1858 break;
1859 }
1860
1861 /* Did the host decide to stop early? */
1862 if (bh->outreq->actual != bh->outreq->length) {
1863 fsg->short_packet_received = 1;
1864 break;
1865 }
1866 continue;
1867 }
1868
1869 /* Wait for something to happen */
1870 rc = sleep_thread(fsg);
1871 if (rc)
1872 return rc;
1873 }
1874
1875 return -EIO; // No default reply
1876 }
1877
1878
1879 /*-------------------------------------------------------------------------*/
1880
1881 /* Sync the file data, don't bother with the metadata.
1882 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1883 static int fsync_sub(struct lun *curlun)
1884 {
1885 struct file *filp = curlun->filp;
1886
1887 if (curlun->ro || !filp)
1888 return 0;
1889 return vfs_fsync(filp, filp->f_path.dentry, 1);
1890 }
1891
1892 static void fsync_all(struct fsg_dev *fsg)
1893 {
1894 int i;
1895
1896 for (i = 0; i < fsg->nluns; ++i)
1897 fsync_sub(&fsg->luns[i]);
1898 }
1899
1900 static int do_synchronize_cache(struct fsg_dev *fsg)
1901 {
1902 struct lun *curlun = fsg->curlun;
1903 int rc;
1904
1905 /* We ignore the requested LBA and write out all file's
1906 * dirty data buffers. */
1907 rc = fsync_sub(curlun);
1908 if (rc)
1909 curlun->sense_data = SS_WRITE_ERROR;
1910 return 0;
1911 }
1912
1913
1914 /*-------------------------------------------------------------------------*/
1915
1916 static void invalidate_sub(struct lun *curlun)
1917 {
1918 struct file *filp = curlun->filp;
1919 struct inode *inode = filp->f_path.dentry->d_inode;
1920 unsigned long rc;
1921
1922 rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
1923 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1924 }
1925
1926 static int do_verify(struct fsg_dev *fsg)
1927 {
1928 struct lun *curlun = fsg->curlun;
1929 u32 lba;
1930 u32 verification_length;
1931 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1932 loff_t file_offset, file_offset_tmp;
1933 u32 amount_left;
1934 unsigned int amount;
1935 ssize_t nread;
1936
1937 /* Get the starting Logical Block Address and check that it's
1938 * not too big */
1939 lba = get_be32(&fsg->cmnd[2]);
1940 if (lba >= curlun->num_sectors) {
1941 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1942 return -EINVAL;
1943 }
1944
1945 /* We allow DPO (Disable Page Out = don't save data in the
1946 * cache) but we don't implement it. */
1947 if ((fsg->cmnd[1] & ~0x10) != 0) {
1948 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1949 return -EINVAL;
1950 }
1951
1952 verification_length = get_be16(&fsg->cmnd[7]);
1953 if (unlikely(verification_length == 0))
1954 return -EIO; // No default reply
1955
1956 /* Prepare to carry out the file verify */
1957 amount_left = verification_length << 9;
1958 file_offset = ((loff_t) lba) << 9;
1959
1960 /* Write out all the dirty buffers before invalidating them */
1961 fsync_sub(curlun);
1962 if (signal_pending(current))
1963 return -EINTR;
1964
1965 invalidate_sub(curlun);
1966 if (signal_pending(current))
1967 return -EINTR;
1968
1969 /* Just try to read the requested blocks */
1970 while (amount_left > 0) {
1971
1972 /* Figure out how much we need to read:
1973 * Try to read the remaining amount, but not more than
1974 * the buffer size.
1975 * And don't try to read past the end of the file.
1976 * If this means reading 0 then we were asked to read
1977 * past the end of file. */
1978 amount = min((unsigned int) amount_left, mod_data.buflen);
1979 amount = min((loff_t) amount,
1980 curlun->file_length - file_offset);
1981 if (amount == 0) {
1982 curlun->sense_data =
1983 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1984 curlun->sense_data_info = file_offset >> 9;
1985 curlun->info_valid = 1;
1986 break;
1987 }
1988
1989 /* Perform the read */
1990 file_offset_tmp = file_offset;
1991 nread = vfs_read(curlun->filp,
1992 (char __user *) bh->buf,
1993 amount, &file_offset_tmp);
1994 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1995 (unsigned long long) file_offset,
1996 (int) nread);
1997 if (signal_pending(current))
1998 return -EINTR;
1999
2000 if (nread < 0) {
2001 LDBG(curlun, "error in file verify: %d\n",
2002 (int) nread);
2003 nread = 0;
2004 } else if (nread < amount) {
2005 LDBG(curlun, "partial file verify: %d/%u\n",
2006 (int) nread, amount);
2007 nread -= (nread & 511); // Round down to a sector
2008 }
2009 if (nread == 0) {
2010 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2011 curlun->sense_data_info = file_offset >> 9;
2012 curlun->info_valid = 1;
2013 break;
2014 }
2015 file_offset += nread;
2016 amount_left -= nread;
2017 }
2018 return 0;
2019 }
2020
2021
2022 /*-------------------------------------------------------------------------*/
2023
2024 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2025 {
2026 u8 *buf = (u8 *) bh->buf;
2027
2028 static char vendor_id[] = "Linux ";
2029 static char product_disk_id[] = "File-Stor Gadget";
2030 static char product_cdrom_id[] = "File-CD Gadget ";
2031
2032 if (!fsg->curlun) { // Unsupported LUNs are okay
2033 fsg->bad_lun_okay = 1;
2034 memset(buf, 0, 36);
2035 buf[0] = 0x7f; // Unsupported, no device-type
2036 buf[4] = 31; // Additional length
2037 return 36;
2038 }
2039
2040 memset(buf, 0, 8);
2041 buf[0] = (mod_data.cdrom ? TYPE_CDROM : TYPE_DISK);
2042 if (mod_data.removable)
2043 buf[1] = 0x80;
2044 buf[2] = 2; // ANSI SCSI level 2
2045 buf[3] = 2; // SCSI-2 INQUIRY data format
2046 buf[4] = 31; // Additional length
2047 // No special options
2048 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id,
2049 (mod_data.cdrom ? product_cdrom_id :
2050 product_disk_id),
2051 mod_data.release);
2052 return 36;
2053 }
2054
2055
2056 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2057 {
2058 struct lun *curlun = fsg->curlun;
2059 u8 *buf = (u8 *) bh->buf;
2060 u32 sd, sdinfo;
2061 int valid;
2062
2063 /*
2064 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2065 *
2066 * If a REQUEST SENSE command is received from an initiator
2067 * with a pending unit attention condition (before the target
2068 * generates the contingent allegiance condition), then the
2069 * target shall either:
2070 * a) report any pending sense data and preserve the unit
2071 * attention condition on the logical unit, or,
2072 * b) report the unit attention condition, may discard any
2073 * pending sense data, and clear the unit attention
2074 * condition on the logical unit for that initiator.
2075 *
2076 * FSG normally uses option a); enable this code to use option b).
2077 */
2078 #if 0
2079 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2080 curlun->sense_data = curlun->unit_attention_data;
2081 curlun->unit_attention_data = SS_NO_SENSE;
2082 }
2083 #endif
2084
2085 if (!curlun) { // Unsupported LUNs are okay
2086 fsg->bad_lun_okay = 1;
2087 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2088 sdinfo = 0;
2089 valid = 0;
2090 } else {
2091 sd = curlun->sense_data;
2092 sdinfo = curlun->sense_data_info;
2093 valid = curlun->info_valid << 7;
2094 curlun->sense_data = SS_NO_SENSE;
2095 curlun->sense_data_info = 0;
2096 curlun->info_valid = 0;
2097 }
2098
2099 memset(buf, 0, 18);
2100 buf[0] = valid | 0x70; // Valid, current error
2101 buf[2] = SK(sd);
2102 put_be32(&buf[3], sdinfo); // Sense information
2103 buf[7] = 18 - 8; // Additional sense length
2104 buf[12] = ASC(sd);
2105 buf[13] = ASCQ(sd);
2106 return 18;
2107 }
2108
2109
2110 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2111 {
2112 struct lun *curlun = fsg->curlun;
2113 u32 lba = get_be32(&fsg->cmnd[2]);
2114 int pmi = fsg->cmnd[8];
2115 u8 *buf = (u8 *) bh->buf;
2116
2117 /* Check the PMI and LBA fields */
2118 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2119 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2120 return -EINVAL;
2121 }
2122
2123 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2124 put_be32(&buf[4], 512); // Block length
2125 return 8;
2126 }
2127
2128
2129 static void store_cdrom_address(u8 *dest, int msf, u32 addr)
2130 {
2131 if (msf) {
2132 /* Convert to Minutes-Seconds-Frames */
2133 addr >>= 2; /* Convert to 2048-byte frames */
2134 addr += 2*75; /* Lead-in occupies 2 seconds */
2135 dest[3] = addr % 75; /* Frames */
2136 addr /= 75;
2137 dest[2] = addr % 60; /* Seconds */
2138 addr /= 60;
2139 dest[1] = addr; /* Minutes */
2140 dest[0] = 0; /* Reserved */
2141 } else {
2142 /* Absolute sector */
2143 put_be32(dest, addr);
2144 }
2145 }
2146
2147 static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2148 {
2149 struct lun *curlun = fsg->curlun;
2150 int msf = fsg->cmnd[1] & 0x02;
2151 u32 lba = get_be32(&fsg->cmnd[2]);
2152 u8 *buf = (u8 *) bh->buf;
2153
2154 if ((fsg->cmnd[1] & ~0x02) != 0) { /* Mask away MSF */
2155 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2156 return -EINVAL;
2157 }
2158 if (lba >= curlun->num_sectors) {
2159 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2160 return -EINVAL;
2161 }
2162
2163 memset(buf, 0, 8);
2164 buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */
2165 store_cdrom_address(&buf[4], msf, lba);
2166 return 8;
2167 }
2168
2169
2170 static int do_read_toc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2171 {
2172 struct lun *curlun = fsg->curlun;
2173 int msf = fsg->cmnd[1] & 0x02;
2174 int start_track = fsg->cmnd[6];
2175 u8 *buf = (u8 *) bh->buf;
2176
2177 if ((fsg->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */
2178 start_track > 1) {
2179 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2180 return -EINVAL;
2181 }
2182
2183 memset(buf, 0, 20);
2184 buf[1] = (20-2); /* TOC data length */
2185 buf[2] = 1; /* First track number */
2186 buf[3] = 1; /* Last track number */
2187 buf[5] = 0x16; /* Data track, copying allowed */
2188 buf[6] = 0x01; /* Only track is number 1 */
2189 store_cdrom_address(&buf[8], msf, 0);
2190
2191 buf[13] = 0x16; /* Lead-out track is data */
2192 buf[14] = 0xAA; /* Lead-out track number */
2193 store_cdrom_address(&buf[16], msf, curlun->num_sectors);
2194 return 20;
2195 }
2196
2197
2198 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2199 {
2200 struct lun *curlun = fsg->curlun;
2201 int mscmnd = fsg->cmnd[0];
2202 u8 *buf = (u8 *) bh->buf;
2203 u8 *buf0 = buf;
2204 int pc, page_code;
2205 int changeable_values, all_pages;
2206 int valid_page = 0;
2207 int len, limit;
2208
2209 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2210 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2211 return -EINVAL;
2212 }
2213 pc = fsg->cmnd[2] >> 6;
2214 page_code = fsg->cmnd[2] & 0x3f;
2215 if (pc == 3) {
2216 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2217 return -EINVAL;
2218 }
2219 changeable_values = (pc == 1);
2220 all_pages = (page_code == 0x3f);
2221
2222 /* Write the mode parameter header. Fixed values are: default
2223 * medium type, no cache control (DPOFUA), and no block descriptors.
2224 * The only variable value is the WriteProtect bit. We will fill in
2225 * the mode data length later. */
2226 memset(buf, 0, 8);
2227 if (mscmnd == SC_MODE_SENSE_6) {
2228 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2229 buf += 4;
2230 limit = 255;
2231 } else { // SC_MODE_SENSE_10
2232 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2233 buf += 8;
2234 limit = 65535; // Should really be mod_data.buflen
2235 }
2236
2237 /* No block descriptors */
2238
2239 /* The mode pages, in numerical order. The only page we support
2240 * is the Caching page. */
2241 if (page_code == 0x08 || all_pages) {
2242 valid_page = 1;
2243 buf[0] = 0x08; // Page code
2244 buf[1] = 10; // Page length
2245 memset(buf+2, 0, 10); // None of the fields are changeable
2246
2247 if (!changeable_values) {
2248 buf[2] = 0x04; // Write cache enable,
2249 // Read cache not disabled
2250 // No cache retention priorities
2251 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2252 // Minimum prefetch = 0
2253 put_be16(&buf[8], 0xffff); // Maximum prefetch
2254 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2255 }
2256 buf += 12;
2257 }
2258
2259 /* Check that a valid page was requested and the mode data length
2260 * isn't too long. */
2261 len = buf - buf0;
2262 if (!valid_page || len > limit) {
2263 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2264 return -EINVAL;
2265 }
2266
2267 /* Store the mode data length */
2268 if (mscmnd == SC_MODE_SENSE_6)
2269 buf0[0] = len - 1;
2270 else
2271 put_be16(buf0, len - 2);
2272 return len;
2273 }
2274
2275
2276 static int do_start_stop(struct fsg_dev *fsg)
2277 {
2278 struct lun *curlun = fsg->curlun;
2279 int loej, start;
2280
2281 if (!mod_data.removable) {
2282 curlun->sense_data = SS_INVALID_COMMAND;
2283 return -EINVAL;
2284 }
2285
2286 // int immed = fsg->cmnd[1] & 0x01;
2287 loej = fsg->cmnd[4] & 0x02;
2288 start = fsg->cmnd[4] & 0x01;
2289
2290 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2291 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2292 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2293 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2294 return -EINVAL;
2295 }
2296
2297 if (!start) {
2298
2299 /* Are we allowed to unload the media? */
2300 if (curlun->prevent_medium_removal) {
2301 LDBG(curlun, "unload attempt prevented\n");
2302 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2303 return -EINVAL;
2304 }
2305 if (loej) { // Simulate an unload/eject
2306 up_read(&fsg->filesem);
2307 down_write(&fsg->filesem);
2308 close_backing_file(curlun);
2309 up_write(&fsg->filesem);
2310 down_read(&fsg->filesem);
2311 }
2312 } else {
2313
2314 /* Our emulation doesn't support mounting; the medium is
2315 * available for use as soon as it is loaded. */
2316 if (!backing_file_is_open(curlun)) {
2317 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2318 return -EINVAL;
2319 }
2320 }
2321 #endif
2322 return 0;
2323 }
2324
2325
2326 static int do_prevent_allow(struct fsg_dev *fsg)
2327 {
2328 struct lun *curlun = fsg->curlun;
2329 int prevent;
2330
2331 if (!mod_data.removable) {
2332 curlun->sense_data = SS_INVALID_COMMAND;
2333 return -EINVAL;
2334 }
2335
2336 prevent = fsg->cmnd[4] & 0x01;
2337 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2338 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2339 return -EINVAL;
2340 }
2341
2342 if (curlun->prevent_medium_removal && !prevent)
2343 fsync_sub(curlun);
2344 curlun->prevent_medium_removal = prevent;
2345 return 0;
2346 }
2347
2348
2349 static int do_read_format_capacities(struct fsg_dev *fsg,
2350 struct fsg_buffhd *bh)
2351 {
2352 struct lun *curlun = fsg->curlun;
2353 u8 *buf = (u8 *) bh->buf;
2354
2355 buf[0] = buf[1] = buf[2] = 0;
2356 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2357 buf += 4;
2358
2359 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2360 put_be32(&buf[4], 512); // Block length
2361 buf[4] = 0x02; // Current capacity
2362 return 12;
2363 }
2364
2365
2366 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2367 {
2368 struct lun *curlun = fsg->curlun;
2369
2370 /* We don't support MODE SELECT */
2371 curlun->sense_data = SS_INVALID_COMMAND;
2372 return -EINVAL;
2373 }
2374
2375
2376 /*-------------------------------------------------------------------------*/
2377
2378 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2379 {
2380 int rc;
2381
2382 rc = fsg_set_halt(fsg, fsg->bulk_in);
2383 if (rc == -EAGAIN)
2384 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2385 while (rc != 0) {
2386 if (rc != -EAGAIN) {
2387 WARNING(fsg, "usb_ep_set_halt -> %d\n", rc);
2388 rc = 0;
2389 break;
2390 }
2391
2392 /* Wait for a short time and then try again */
2393 if (msleep_interruptible(100) != 0)
2394 return -EINTR;
2395 rc = usb_ep_set_halt(fsg->bulk_in);
2396 }
2397 return rc;
2398 }
2399
2400 static int wedge_bulk_in_endpoint(struct fsg_dev *fsg)
2401 {
2402 int rc;
2403
2404 DBG(fsg, "bulk-in set wedge\n");
2405 rc = usb_ep_set_wedge(fsg->bulk_in);
2406 if (rc == -EAGAIN)
2407 VDBG(fsg, "delayed bulk-in endpoint wedge\n");
2408 while (rc != 0) {
2409 if (rc != -EAGAIN) {
2410 WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc);
2411 rc = 0;
2412 break;
2413 }
2414
2415 /* Wait for a short time and then try again */
2416 if (msleep_interruptible(100) != 0)
2417 return -EINTR;
2418 rc = usb_ep_set_wedge(fsg->bulk_in);
2419 }
2420 return rc;
2421 }
2422
2423 static int pad_with_zeros(struct fsg_dev *fsg)
2424 {
2425 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2426 u32 nkeep = bh->inreq->length;
2427 u32 nsend;
2428 int rc;
2429
2430 bh->state = BUF_STATE_EMPTY; // For the first iteration
2431 fsg->usb_amount_left = nkeep + fsg->residue;
2432 while (fsg->usb_amount_left > 0) {
2433
2434 /* Wait for the next buffer to be free */
2435 while (bh->state != BUF_STATE_EMPTY) {
2436 rc = sleep_thread(fsg);
2437 if (rc)
2438 return rc;
2439 }
2440
2441 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2442 memset(bh->buf + nkeep, 0, nsend - nkeep);
2443 bh->inreq->length = nsend;
2444 bh->inreq->zero = 0;
2445 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2446 &bh->inreq_busy, &bh->state);
2447 bh = fsg->next_buffhd_to_fill = bh->next;
2448 fsg->usb_amount_left -= nsend;
2449 nkeep = 0;
2450 }
2451 return 0;
2452 }
2453
2454 static int throw_away_data(struct fsg_dev *fsg)
2455 {
2456 struct fsg_buffhd *bh;
2457 u32 amount;
2458 int rc;
2459
2460 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2461 fsg->usb_amount_left > 0) {
2462
2463 /* Throw away the data in a filled buffer */
2464 if (bh->state == BUF_STATE_FULL) {
2465 smp_rmb();
2466 bh->state = BUF_STATE_EMPTY;
2467 fsg->next_buffhd_to_drain = bh->next;
2468
2469 /* A short packet or an error ends everything */
2470 if (bh->outreq->actual != bh->outreq->length ||
2471 bh->outreq->status != 0) {
2472 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2473 return -EINTR;
2474 }
2475 continue;
2476 }
2477
2478 /* Try to submit another request if we need one */
2479 bh = fsg->next_buffhd_to_fill;
2480 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2481 amount = min(fsg->usb_amount_left,
2482 (u32) mod_data.buflen);
2483
2484 /* amount is always divisible by 512, hence by
2485 * the bulk-out maxpacket size */
2486 bh->outreq->length = bh->bulk_out_intended_length =
2487 amount;
2488 bh->outreq->short_not_ok = 1;
2489 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2490 &bh->outreq_busy, &bh->state);
2491 fsg->next_buffhd_to_fill = bh->next;
2492 fsg->usb_amount_left -= amount;
2493 continue;
2494 }
2495
2496 /* Otherwise wait for something to happen */
2497 rc = sleep_thread(fsg);
2498 if (rc)
2499 return rc;
2500 }
2501 return 0;
2502 }
2503
2504
2505 static int finish_reply(struct fsg_dev *fsg)
2506 {
2507 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2508 int rc = 0;
2509
2510 switch (fsg->data_dir) {
2511 case DATA_DIR_NONE:
2512 break; // Nothing to send
2513
2514 /* If we don't know whether the host wants to read or write,
2515 * this must be CB or CBI with an unknown command. We mustn't
2516 * try to send or receive any data. So stall both bulk pipes
2517 * if we can and wait for a reset. */
2518 case DATA_DIR_UNKNOWN:
2519 if (mod_data.can_stall) {
2520 fsg_set_halt(fsg, fsg->bulk_out);
2521 rc = halt_bulk_in_endpoint(fsg);
2522 }
2523 break;
2524
2525 /* All but the last buffer of data must have already been sent */
2526 case DATA_DIR_TO_HOST:
2527 if (fsg->data_size == 0)
2528 ; // Nothing to send
2529
2530 /* If there's no residue, simply send the last buffer */
2531 else if (fsg->residue == 0) {
2532 bh->inreq->zero = 0;
2533 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2534 &bh->inreq_busy, &bh->state);
2535 fsg->next_buffhd_to_fill = bh->next;
2536 }
2537
2538 /* There is a residue. For CB and CBI, simply mark the end
2539 * of the data with a short packet. However, if we are
2540 * allowed to stall, there was no data at all (residue ==
2541 * data_size), and the command failed (invalid LUN or
2542 * sense data is set), then halt the bulk-in endpoint
2543 * instead. */
2544 else if (!transport_is_bbb()) {
2545 if (mod_data.can_stall &&
2546 fsg->residue == fsg->data_size &&
2547 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2548 bh->state = BUF_STATE_EMPTY;
2549 rc = halt_bulk_in_endpoint(fsg);
2550 } else {
2551 bh->inreq->zero = 1;
2552 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2553 &bh->inreq_busy, &bh->state);
2554 fsg->next_buffhd_to_fill = bh->next;
2555 }
2556 }
2557
2558 /* For Bulk-only, if we're allowed to stall then send the
2559 * short packet and halt the bulk-in endpoint. If we can't
2560 * stall, pad out the remaining data with 0's. */
2561 else {
2562 if (mod_data.can_stall) {
2563 bh->inreq->zero = 1;
2564 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2565 &bh->inreq_busy, &bh->state);
2566 fsg->next_buffhd_to_fill = bh->next;
2567 rc = halt_bulk_in_endpoint(fsg);
2568 } else
2569 rc = pad_with_zeros(fsg);
2570 }
2571 break;
2572
2573 /* We have processed all we want from the data the host has sent.
2574 * There may still be outstanding bulk-out requests. */
2575 case DATA_DIR_FROM_HOST:
2576 if (fsg->residue == 0)
2577 ; // Nothing to receive
2578
2579 /* Did the host stop sending unexpectedly early? */
2580 else if (fsg->short_packet_received) {
2581 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2582 rc = -EINTR;
2583 }
2584
2585 /* We haven't processed all the incoming data. Even though
2586 * we may be allowed to stall, doing so would cause a race.
2587 * The controller may already have ACK'ed all the remaining
2588 * bulk-out packets, in which case the host wouldn't see a
2589 * STALL. Not realizing the endpoint was halted, it wouldn't
2590 * clear the halt -- leading to problems later on. */
2591 #if 0
2592 else if (mod_data.can_stall) {
2593 fsg_set_halt(fsg, fsg->bulk_out);
2594 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2595 rc = -EINTR;
2596 }
2597 #endif
2598
2599 /* We can't stall. Read in the excess data and throw it
2600 * all away. */
2601 else
2602 rc = throw_away_data(fsg);
2603 break;
2604 }
2605 return rc;
2606 }
2607
2608
2609 static int send_status(struct fsg_dev *fsg)
2610 {
2611 struct lun *curlun = fsg->curlun;
2612 struct fsg_buffhd *bh;
2613 int rc;
2614 u8 status = USB_STATUS_PASS;
2615 u32 sd, sdinfo = 0;
2616
2617 /* Wait for the next buffer to become available */
2618 bh = fsg->next_buffhd_to_fill;
2619 while (bh->state != BUF_STATE_EMPTY) {
2620 rc = sleep_thread(fsg);
2621 if (rc)
2622 return rc;
2623 }
2624
2625 if (curlun) {
2626 sd = curlun->sense_data;
2627 sdinfo = curlun->sense_data_info;
2628 } else if (fsg->bad_lun_okay)
2629 sd = SS_NO_SENSE;
2630 else
2631 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2632
2633 if (fsg->phase_error) {
2634 DBG(fsg, "sending phase-error status\n");
2635 status = USB_STATUS_PHASE_ERROR;
2636 sd = SS_INVALID_COMMAND;
2637 } else if (sd != SS_NO_SENSE) {
2638 DBG(fsg, "sending command-failure status\n");
2639 status = USB_STATUS_FAIL;
2640 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2641 " info x%x\n",
2642 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2643 }
2644
2645 if (transport_is_bbb()) {
2646 struct bulk_cs_wrap *csw = bh->buf;
2647
2648 /* Store and send the Bulk-only CSW */
2649 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2650 csw->Tag = fsg->tag;
2651 csw->Residue = cpu_to_le32(fsg->residue);
2652 csw->Status = status;
2653
2654 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2655 bh->inreq->zero = 0;
2656 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2657 &bh->inreq_busy, &bh->state);
2658
2659 } else if (mod_data.transport_type == USB_PR_CB) {
2660
2661 /* Control-Bulk transport has no status phase! */
2662 return 0;
2663
2664 } else { // USB_PR_CBI
2665 struct interrupt_data *buf = bh->buf;
2666
2667 /* Store and send the Interrupt data. UFI sends the ASC
2668 * and ASCQ bytes. Everything else sends a Type (which
2669 * is always 0) and the status Value. */
2670 if (mod_data.protocol_type == USB_SC_UFI) {
2671 buf->bType = ASC(sd);
2672 buf->bValue = ASCQ(sd);
2673 } else {
2674 buf->bType = 0;
2675 buf->bValue = status;
2676 }
2677 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2678
2679 fsg->intr_buffhd = bh; // Point to the right buffhd
2680 fsg->intreq->buf = bh->inreq->buf;
2681 fsg->intreq->context = bh;
2682 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2683 &fsg->intreq_busy, &bh->state);
2684 }
2685
2686 fsg->next_buffhd_to_fill = bh->next;
2687 return 0;
2688 }
2689
2690
2691 /*-------------------------------------------------------------------------*/
2692
2693 /* Check whether the command is properly formed and whether its data size
2694 * and direction agree with the values we already have. */
2695 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2696 enum data_direction data_dir, unsigned int mask,
2697 int needs_medium, const char *name)
2698 {
2699 int i;
2700 int lun = fsg->cmnd[1] >> 5;
2701 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2702 char hdlen[20];
2703 struct lun *curlun;
2704
2705 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2706 * Transparent SCSI doesn't pad. */
2707 if (protocol_is_scsi())
2708 ;
2709
2710 /* There's some disagreement as to whether RBC pads commands or not.
2711 * We'll play it safe and accept either form. */
2712 else if (mod_data.protocol_type == USB_SC_RBC) {
2713 if (fsg->cmnd_size == 12)
2714 cmnd_size = 12;
2715
2716 /* All the other protocols pad to 12 bytes */
2717 } else
2718 cmnd_size = 12;
2719
2720 hdlen[0] = 0;
2721 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2722 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2723 fsg->data_size);
2724 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2725 name, cmnd_size, dirletter[(int) data_dir],
2726 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2727
2728 /* We can't reply at all until we know the correct data direction
2729 * and size. */
2730 if (fsg->data_size_from_cmnd == 0)
2731 data_dir = DATA_DIR_NONE;
2732 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2733 fsg->data_dir = data_dir;
2734 fsg->data_size = fsg->data_size_from_cmnd;
2735
2736 } else { // Bulk-only
2737 if (fsg->data_size < fsg->data_size_from_cmnd) {
2738
2739 /* Host data size < Device data size is a phase error.
2740 * Carry out the command, but only transfer as much
2741 * as we are allowed. */
2742 fsg->data_size_from_cmnd = fsg->data_size;
2743 fsg->phase_error = 1;
2744 }
2745 }
2746 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2747
2748 /* Conflicting data directions is a phase error */
2749 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2750 fsg->phase_error = 1;
2751 return -EINVAL;
2752 }
2753
2754 /* Verify the length of the command itself */
2755 if (cmnd_size != fsg->cmnd_size) {
2756
2757 /* Special case workaround: There are plenty of buggy SCSI
2758 * implementations. Many have issues with cbw->Length
2759 * field passing a wrong command size. For those cases we
2760 * always try to work around the problem by using the length
2761 * sent by the host side provided it is at least as large
2762 * as the correct command length.
2763 * Examples of such cases would be MS-Windows, which issues
2764 * REQUEST SENSE with cbw->Length == 12 where it should
2765 * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
2766 * REQUEST SENSE with cbw->Length == 10 where it should
2767 * be 6 as well.
2768 */
2769 if (cmnd_size <= fsg->cmnd_size) {
2770 DBG(fsg, "%s is buggy! Expected length %d "
2771 "but we got %d\n", name,
2772 cmnd_size, fsg->cmnd_size);
2773 cmnd_size = fsg->cmnd_size;
2774 } else {
2775 fsg->phase_error = 1;
2776 return -EINVAL;
2777 }
2778 }
2779
2780 /* Check that the LUN values are consistent */
2781 if (transport_is_bbb()) {
2782 if (fsg->lun != lun)
2783 DBG(fsg, "using LUN %d from CBW, "
2784 "not LUN %d from CDB\n",
2785 fsg->lun, lun);
2786 } else
2787 fsg->lun = lun; // Use LUN from the command
2788
2789 /* Check the LUN */
2790 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2791 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2792 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2793 curlun->sense_data = SS_NO_SENSE;
2794 curlun->sense_data_info = 0;
2795 curlun->info_valid = 0;
2796 }
2797 } else {
2798 fsg->curlun = curlun = NULL;
2799 fsg->bad_lun_okay = 0;
2800
2801 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2802 * to use unsupported LUNs; all others may not. */
2803 if (fsg->cmnd[0] != SC_INQUIRY &&
2804 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2805 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2806 return -EINVAL;
2807 }
2808 }
2809
2810 /* If a unit attention condition exists, only INQUIRY and
2811 * REQUEST SENSE commands are allowed; anything else must fail. */
2812 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2813 fsg->cmnd[0] != SC_INQUIRY &&
2814 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2815 curlun->sense_data = curlun->unit_attention_data;
2816 curlun->unit_attention_data = SS_NO_SENSE;
2817 return -EINVAL;
2818 }
2819
2820 /* Check that only command bytes listed in the mask are non-zero */
2821 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2822 for (i = 1; i < cmnd_size; ++i) {
2823 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2824 if (curlun)
2825 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2826 return -EINVAL;
2827 }
2828 }
2829
2830 /* If the medium isn't mounted and the command needs to access
2831 * it, return an error. */
2832 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2833 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2834 return -EINVAL;
2835 }
2836
2837 return 0;
2838 }
2839
2840
2841 static int do_scsi_command(struct fsg_dev *fsg)
2842 {
2843 struct fsg_buffhd *bh;
2844 int rc;
2845 int reply = -EINVAL;
2846 int i;
2847 static char unknown[16];
2848
2849 dump_cdb(fsg);
2850
2851 /* Wait for the next buffer to become available for data or status */
2852 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2853 while (bh->state != BUF_STATE_EMPTY) {
2854 rc = sleep_thread(fsg);
2855 if (rc)
2856 return rc;
2857 }
2858 fsg->phase_error = 0;
2859 fsg->short_packet_received = 0;
2860
2861 down_read(&fsg->filesem); // We're using the backing file
2862 switch (fsg->cmnd[0]) {
2863
2864 case SC_INQUIRY:
2865 fsg->data_size_from_cmnd = fsg->cmnd[4];
2866 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2867 (1<<4), 0,
2868 "INQUIRY")) == 0)
2869 reply = do_inquiry(fsg, bh);
2870 break;
2871
2872 case SC_MODE_SELECT_6:
2873 fsg->data_size_from_cmnd = fsg->cmnd[4];
2874 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2875 (1<<1) | (1<<4), 0,
2876 "MODE SELECT(6)")) == 0)
2877 reply = do_mode_select(fsg, bh);
2878 break;
2879
2880 case SC_MODE_SELECT_10:
2881 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2882 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2883 (1<<1) | (3<<7), 0,
2884 "MODE SELECT(10)")) == 0)
2885 reply = do_mode_select(fsg, bh);
2886 break;
2887
2888 case SC_MODE_SENSE_6:
2889 fsg->data_size_from_cmnd = fsg->cmnd[4];
2890 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2891 (1<<1) | (1<<2) | (1<<4), 0,
2892 "MODE SENSE(6)")) == 0)
2893 reply = do_mode_sense(fsg, bh);
2894 break;
2895
2896 case SC_MODE_SENSE_10:
2897 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2898 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2899 (1<<1) | (1<<2) | (3<<7), 0,
2900 "MODE SENSE(10)")) == 0)
2901 reply = do_mode_sense(fsg, bh);
2902 break;
2903
2904 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2905 fsg->data_size_from_cmnd = 0;
2906 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2907 (1<<4), 0,
2908 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2909 reply = do_prevent_allow(fsg);
2910 break;
2911
2912 case SC_READ_6:
2913 i = fsg->cmnd[4];
2914 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2915 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2916 (7<<1) | (1<<4), 1,
2917 "READ(6)")) == 0)
2918 reply = do_read(fsg);
2919 break;
2920
2921 case SC_READ_10:
2922 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2923 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2924 (1<<1) | (0xf<<2) | (3<<7), 1,
2925 "READ(10)")) == 0)
2926 reply = do_read(fsg);
2927 break;
2928
2929 case SC_READ_12:
2930 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2931 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2932 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2933 "READ(12)")) == 0)
2934 reply = do_read(fsg);
2935 break;
2936
2937 case SC_READ_CAPACITY:
2938 fsg->data_size_from_cmnd = 8;
2939 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2940 (0xf<<2) | (1<<8), 1,
2941 "READ CAPACITY")) == 0)
2942 reply = do_read_capacity(fsg, bh);
2943 break;
2944
2945 case SC_READ_HEADER:
2946 if (!mod_data.cdrom)
2947 goto unknown_cmnd;
2948 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2949 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2950 (3<<7) | (0x1f<<1), 1,
2951 "READ HEADER")) == 0)
2952 reply = do_read_header(fsg, bh);
2953 break;
2954
2955 case SC_READ_TOC:
2956 if (!mod_data.cdrom)
2957 goto unknown_cmnd;
2958 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2959 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2960 (7<<6) | (1<<1), 1,
2961 "READ TOC")) == 0)
2962 reply = do_read_toc(fsg, bh);
2963 break;
2964
2965 case SC_READ_FORMAT_CAPACITIES:
2966 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2967 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2968 (3<<7), 1,
2969 "READ FORMAT CAPACITIES")) == 0)
2970 reply = do_read_format_capacities(fsg, bh);
2971 break;
2972
2973 case SC_REQUEST_SENSE:
2974 fsg->data_size_from_cmnd = fsg->cmnd[4];
2975 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2976 (1<<4), 0,
2977 "REQUEST SENSE")) == 0)
2978 reply = do_request_sense(fsg, bh);
2979 break;
2980
2981 case SC_START_STOP_UNIT:
2982 fsg->data_size_from_cmnd = 0;
2983 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2984 (1<<1) | (1<<4), 0,
2985 "START-STOP UNIT")) == 0)
2986 reply = do_start_stop(fsg);
2987 break;
2988
2989 case SC_SYNCHRONIZE_CACHE:
2990 fsg->data_size_from_cmnd = 0;
2991 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2992 (0xf<<2) | (3<<7), 1,
2993 "SYNCHRONIZE CACHE")) == 0)
2994 reply = do_synchronize_cache(fsg);
2995 break;
2996
2997 case SC_TEST_UNIT_READY:
2998 fsg->data_size_from_cmnd = 0;
2999 reply = check_command(fsg, 6, DATA_DIR_NONE,
3000 0, 1,
3001 "TEST UNIT READY");
3002 break;
3003
3004 /* Although optional, this command is used by MS-Windows. We
3005 * support a minimal version: BytChk must be 0. */
3006 case SC_VERIFY:
3007 fsg->data_size_from_cmnd = 0;
3008 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
3009 (1<<1) | (0xf<<2) | (3<<7), 1,
3010 "VERIFY")) == 0)
3011 reply = do_verify(fsg);
3012 break;
3013
3014 case SC_WRITE_6:
3015 i = fsg->cmnd[4];
3016 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
3017 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
3018 (7<<1) | (1<<4), 1,
3019 "WRITE(6)")) == 0)
3020 reply = do_write(fsg);
3021 break;
3022
3023 case SC_WRITE_10:
3024 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
3025 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
3026 (1<<1) | (0xf<<2) | (3<<7), 1,
3027 "WRITE(10)")) == 0)
3028 reply = do_write(fsg);
3029 break;
3030
3031 case SC_WRITE_12:
3032 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
3033 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
3034 (1<<1) | (0xf<<2) | (0xf<<6), 1,
3035 "WRITE(12)")) == 0)
3036 reply = do_write(fsg);
3037 break;
3038
3039 /* Some mandatory commands that we recognize but don't implement.
3040 * They don't mean much in this setting. It's left as an exercise
3041 * for anyone interested to implement RESERVE and RELEASE in terms
3042 * of Posix locks. */
3043 case SC_FORMAT_UNIT:
3044 case SC_RELEASE:
3045 case SC_RESERVE:
3046 case SC_SEND_DIAGNOSTIC:
3047 // Fall through
3048
3049 default:
3050 unknown_cmnd:
3051 fsg->data_size_from_cmnd = 0;
3052 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
3053 if ((reply = check_command(fsg, fsg->cmnd_size,
3054 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
3055 fsg->curlun->sense_data = SS_INVALID_COMMAND;
3056 reply = -EINVAL;
3057 }
3058 break;
3059 }
3060 up_read(&fsg->filesem);
3061
3062 if (reply == -EINTR || signal_pending(current))
3063 return -EINTR;
3064
3065 /* Set up the single reply buffer for finish_reply() */
3066 if (reply == -EINVAL)
3067 reply = 0; // Error reply length
3068 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
3069 reply = min((u32) reply, fsg->data_size_from_cmnd);
3070 bh->inreq->length = reply;
3071 bh->state = BUF_STATE_FULL;
3072 fsg->residue -= reply;
3073 } // Otherwise it's already set
3074
3075 return 0;
3076 }
3077
3078
3079 /*-------------------------------------------------------------------------*/
3080
3081 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
3082 {
3083 struct usb_request *req = bh->outreq;
3084 struct bulk_cb_wrap *cbw = req->buf;
3085
3086 /* Was this a real packet? Should it be ignored? */
3087 if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
3088 return -EINVAL;
3089
3090 /* Is the CBW valid? */
3091 if (req->actual != USB_BULK_CB_WRAP_LEN ||
3092 cbw->Signature != __constant_cpu_to_le32(
3093 USB_BULK_CB_SIG)) {
3094 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
3095 req->actual,
3096 le32_to_cpu(cbw->Signature));
3097
3098 /* The Bulk-only spec says we MUST stall the IN endpoint
3099 * (6.6.1), so it's unavoidable. It also says we must
3100 * retain this state until the next reset, but there's
3101 * no way to tell the controller driver it should ignore
3102 * Clear-Feature(HALT) requests.
3103 *
3104 * We aren't required to halt the OUT endpoint; instead
3105 * we can simply accept and discard any data received
3106 * until the next reset. */
3107 wedge_bulk_in_endpoint(fsg);
3108 set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
3109 return -EINVAL;
3110 }
3111
3112 /* Is the CBW meaningful? */
3113 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
3114 cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
3115 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
3116 "cmdlen %u\n",
3117 cbw->Lun, cbw->Flags, cbw->Length);
3118
3119 /* We can do anything we want here, so let's stall the
3120 * bulk pipes if we are allowed to. */
3121 if (mod_data.can_stall) {
3122 fsg_set_halt(fsg, fsg->bulk_out);
3123 halt_bulk_in_endpoint(fsg);
3124 }
3125 return -EINVAL;
3126 }
3127
3128 /* Save the command for later */
3129 fsg->cmnd_size = cbw->Length;
3130 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
3131 if (cbw->Flags & USB_BULK_IN_FLAG)
3132 fsg->data_dir = DATA_DIR_TO_HOST;
3133 else
3134 fsg->data_dir = DATA_DIR_FROM_HOST;
3135 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
3136 if (fsg->data_size == 0)
3137 fsg->data_dir = DATA_DIR_NONE;
3138 fsg->lun = cbw->Lun;
3139 fsg->tag = cbw->Tag;
3140 return 0;
3141 }
3142
3143
3144 static int get_next_command(struct fsg_dev *fsg)
3145 {
3146 struct fsg_buffhd *bh;
3147 int rc = 0;
3148
3149 if (transport_is_bbb()) {
3150
3151 /* Wait for the next buffer to become available */
3152 bh = fsg->next_buffhd_to_fill;
3153 while (bh->state != BUF_STATE_EMPTY) {
3154 rc = sleep_thread(fsg);
3155 if (rc)
3156 return rc;
3157 }
3158
3159 /* Queue a request to read a Bulk-only CBW */
3160 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3161 bh->outreq->short_not_ok = 1;
3162 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3163 &bh->outreq_busy, &bh->state);
3164
3165 /* We will drain the buffer in software, which means we
3166 * can reuse it for the next filling. No need to advance
3167 * next_buffhd_to_fill. */
3168
3169 /* Wait for the CBW to arrive */
3170 while (bh->state != BUF_STATE_FULL) {
3171 rc = sleep_thread(fsg);
3172 if (rc)
3173 return rc;
3174 }
3175 smp_rmb();
3176 rc = received_cbw(fsg, bh);
3177 bh->state = BUF_STATE_EMPTY;
3178
3179 } else { // USB_PR_CB or USB_PR_CBI
3180
3181 /* Wait for the next command to arrive */
3182 while (fsg->cbbuf_cmnd_size == 0) {
3183 rc = sleep_thread(fsg);
3184 if (rc)
3185 return rc;
3186 }
3187
3188 /* Is the previous status interrupt request still busy?
3189 * The host is allowed to skip reading the status,
3190 * so we must cancel it. */
3191 if (fsg->intreq_busy)
3192 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3193
3194 /* Copy the command and mark the buffer empty */
3195 fsg->data_dir = DATA_DIR_UNKNOWN;
3196 spin_lock_irq(&fsg->lock);
3197 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3198 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3199 fsg->cbbuf_cmnd_size = 0;
3200 spin_unlock_irq(&fsg->lock);
3201 }
3202 return rc;
3203 }
3204
3205
3206 /*-------------------------------------------------------------------------*/
3207
3208 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3209 const struct usb_endpoint_descriptor *d)
3210 {
3211 int rc;
3212
3213 ep->driver_data = fsg;
3214 rc = usb_ep_enable(ep, d);
3215 if (rc)
3216 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3217 return rc;
3218 }
3219
3220 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3221 struct usb_request **preq)
3222 {
3223 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3224 if (*preq)
3225 return 0;
3226 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3227 return -ENOMEM;
3228 }
3229
3230 /*
3231 * Reset interface setting and re-init endpoint state (toggle etc).
3232 * Call with altsetting < 0 to disable the interface. The only other
3233 * available altsetting is 0, which enables the interface.
3234 */
3235 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3236 {
3237 int rc = 0;
3238 int i;
3239 const struct usb_endpoint_descriptor *d;
3240
3241 if (fsg->running)
3242 DBG(fsg, "reset interface\n");
3243
3244 reset:
3245 /* Deallocate the requests */
3246 for (i = 0; i < NUM_BUFFERS; ++i) {
3247 struct fsg_buffhd *bh = &fsg->buffhds[i];
3248
3249 if (bh->inreq) {
3250 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3251 bh->inreq = NULL;
3252 }
3253 if (bh->outreq) {
3254 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3255 bh->outreq = NULL;
3256 }
3257 }
3258 if (fsg->intreq) {
3259 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3260 fsg->intreq = NULL;
3261 }
3262
3263 /* Disable the endpoints */
3264 if (fsg->bulk_in_enabled) {
3265 usb_ep_disable(fsg->bulk_in);
3266 fsg->bulk_in_enabled = 0;
3267 }
3268 if (fsg->bulk_out_enabled) {
3269 usb_ep_disable(fsg->bulk_out);
3270 fsg->bulk_out_enabled = 0;
3271 }
3272 if (fsg->intr_in_enabled) {
3273 usb_ep_disable(fsg->intr_in);
3274 fsg->intr_in_enabled = 0;
3275 }
3276
3277 fsg->running = 0;
3278 if (altsetting < 0 || rc != 0)
3279 return rc;
3280
3281 DBG(fsg, "set interface %d\n", altsetting);
3282
3283 /* Enable the endpoints */
3284 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3285 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3286 goto reset;
3287 fsg->bulk_in_enabled = 1;
3288
3289 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3290 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3291 goto reset;
3292 fsg->bulk_out_enabled = 1;
3293 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3294 clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
3295
3296 if (transport_is_cbi()) {
3297 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3298 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3299 goto reset;
3300 fsg->intr_in_enabled = 1;
3301 }
3302
3303 /* Allocate the requests */
3304 for (i = 0; i < NUM_BUFFERS; ++i) {
3305 struct fsg_buffhd *bh = &fsg->buffhds[i];
3306
3307 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3308 goto reset;
3309 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3310 goto reset;
3311 bh->inreq->buf = bh->outreq->buf = bh->buf;
3312 bh->inreq->context = bh->outreq->context = bh;
3313 bh->inreq->complete = bulk_in_complete;
3314 bh->outreq->complete = bulk_out_complete;
3315 }
3316 if (transport_is_cbi()) {
3317 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3318 goto reset;
3319 fsg->intreq->complete = intr_in_complete;
3320 }
3321
3322 fsg->running = 1;
3323 for (i = 0; i < fsg->nluns; ++i)
3324 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3325 return rc;
3326 }
3327
3328
3329 /*
3330 * Change our operational configuration. This code must agree with the code
3331 * that returns config descriptors, and with interface altsetting code.
3332 *
3333 * It's also responsible for power management interactions. Some
3334 * configurations might not work with our current power sources.
3335 * For now we just assume the gadget is always self-powered.
3336 */
3337 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3338 {
3339 int rc = 0;
3340
3341 /* Disable the single interface */
3342 if (fsg->config != 0) {
3343 DBG(fsg, "reset config\n");
3344 fsg->config = 0;
3345 rc = do_set_interface(fsg, -1);
3346 }
3347
3348 /* Enable the interface */
3349 if (new_config != 0) {
3350 fsg->config = new_config;
3351 if ((rc = do_set_interface(fsg, 0)) != 0)
3352 fsg->config = 0; // Reset on errors
3353 else {
3354 char *speed;
3355
3356 switch (fsg->gadget->speed) {
3357 case USB_SPEED_LOW: speed = "low"; break;
3358 case USB_SPEED_FULL: speed = "full"; break;
3359 case USB_SPEED_HIGH: speed = "high"; break;
3360 default: speed = "?"; break;
3361 }
3362 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3363 }
3364 }
3365 return rc;
3366 }
3367
3368
3369 /*-------------------------------------------------------------------------*/
3370
3371 static void handle_exception(struct fsg_dev *fsg)
3372 {
3373 siginfo_t info;
3374 int sig;
3375 int i;
3376 int num_active;
3377 struct fsg_buffhd *bh;
3378 enum fsg_state old_state;
3379 u8 new_config;
3380 struct lun *curlun;
3381 unsigned int exception_req_tag;
3382 int rc;
3383
3384 /* Clear the existing signals. Anything but SIGUSR1 is converted
3385 * into a high-priority EXIT exception. */
3386 for (;;) {
3387 sig = dequeue_signal_lock(current, &current->blocked, &info);
3388 if (!sig)
3389 break;
3390 if (sig != SIGUSR1) {
3391 if (fsg->state < FSG_STATE_EXIT)
3392 DBG(fsg, "Main thread exiting on signal\n");
3393 raise_exception(fsg, FSG_STATE_EXIT);
3394 }
3395 }
3396
3397 /* Cancel all the pending transfers */
3398 if (fsg->intreq_busy)
3399 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3400 for (i = 0; i < NUM_BUFFERS; ++i) {
3401 bh = &fsg->buffhds[i];
3402 if (bh->inreq_busy)
3403 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3404 if (bh->outreq_busy)
3405 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3406 }
3407
3408 /* Wait until everything is idle */
3409 for (;;) {
3410 num_active = fsg->intreq_busy;
3411 for (i = 0; i < NUM_BUFFERS; ++i) {
3412 bh = &fsg->buffhds[i];
3413 num_active += bh->inreq_busy + bh->outreq_busy;
3414 }
3415 if (num_active == 0)
3416 break;
3417 if (sleep_thread(fsg))
3418 return;
3419 }
3420
3421 /* Clear out the controller's fifos */
3422 if (fsg->bulk_in_enabled)
3423 usb_ep_fifo_flush(fsg->bulk_in);
3424 if (fsg->bulk_out_enabled)
3425 usb_ep_fifo_flush(fsg->bulk_out);
3426 if (fsg->intr_in_enabled)
3427 usb_ep_fifo_flush(fsg->intr_in);
3428
3429 /* Reset the I/O buffer states and pointers, the SCSI
3430 * state, and the exception. Then invoke the handler. */
3431 spin_lock_irq(&fsg->lock);
3432
3433 for (i = 0; i < NUM_BUFFERS; ++i) {
3434 bh = &fsg->buffhds[i];
3435 bh->state = BUF_STATE_EMPTY;
3436 }
3437 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3438 &fsg->buffhds[0];
3439
3440 exception_req_tag = fsg->exception_req_tag;
3441 new_config = fsg->new_config;
3442 old_state = fsg->state;
3443
3444 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3445 fsg->state = FSG_STATE_STATUS_PHASE;
3446 else {
3447 for (i = 0; i < fsg->nluns; ++i) {
3448 curlun = &fsg->luns[i];
3449 curlun->prevent_medium_removal = 0;
3450 curlun->sense_data = curlun->unit_attention_data =
3451 SS_NO_SENSE;
3452 curlun->sense_data_info = 0;
3453 curlun->info_valid = 0;
3454 }
3455 fsg->state = FSG_STATE_IDLE;
3456 }
3457 spin_unlock_irq(&fsg->lock);
3458
3459 /* Carry out any extra actions required for the exception */
3460 switch (old_state) {
3461 default:
3462 break;
3463
3464 case FSG_STATE_ABORT_BULK_OUT:
3465 send_status(fsg);
3466 spin_lock_irq(&fsg->lock);
3467 if (fsg->state == FSG_STATE_STATUS_PHASE)
3468 fsg->state = FSG_STATE_IDLE;
3469 spin_unlock_irq(&fsg->lock);
3470 break;
3471
3472 case FSG_STATE_RESET:
3473 /* In case we were forced against our will to halt a
3474 * bulk endpoint, clear the halt now. (The SuperH UDC
3475 * requires this.) */
3476 if (test_and_clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
3477 usb_ep_clear_halt(fsg->bulk_in);
3478
3479 if (transport_is_bbb()) {
3480 if (fsg->ep0_req_tag == exception_req_tag)
3481 ep0_queue(fsg); // Complete the status stage
3482
3483 } else if (transport_is_cbi())
3484 send_status(fsg); // Status by interrupt pipe
3485
3486 /* Technically this should go here, but it would only be
3487 * a waste of time. Ditto for the INTERFACE_CHANGE and
3488 * CONFIG_CHANGE cases. */
3489 // for (i = 0; i < fsg->nluns; ++i)
3490 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3491 break;
3492
3493 case FSG_STATE_INTERFACE_CHANGE:
3494 rc = do_set_interface(fsg, 0);
3495 if (fsg->ep0_req_tag != exception_req_tag)
3496 break;
3497 if (rc != 0) // STALL on errors
3498 fsg_set_halt(fsg, fsg->ep0);
3499 else // Complete the status stage
3500 ep0_queue(fsg);
3501 break;
3502
3503 case FSG_STATE_CONFIG_CHANGE:
3504 rc = do_set_config(fsg, new_config);
3505 if (fsg->ep0_req_tag != exception_req_tag)
3506 break;
3507 if (rc != 0) // STALL on errors
3508 fsg_set_halt(fsg, fsg->ep0);
3509 else // Complete the status stage
3510 ep0_queue(fsg);
3511 break;
3512
3513 case FSG_STATE_DISCONNECT:
3514 fsync_all(fsg);
3515 do_set_config(fsg, 0); // Unconfigured state
3516 break;
3517
3518 case FSG_STATE_EXIT:
3519 case FSG_STATE_TERMINATED:
3520 do_set_config(fsg, 0); // Free resources
3521 spin_lock_irq(&fsg->lock);
3522 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3523 spin_unlock_irq(&fsg->lock);
3524 break;
3525 }
3526 }
3527
3528
3529 /*-------------------------------------------------------------------------*/
3530
3531 static int fsg_main_thread(void *fsg_)
3532 {
3533 struct fsg_dev *fsg = fsg_;
3534
3535 /* Allow the thread to be killed by a signal, but set the signal mask
3536 * to block everything but INT, TERM, KILL, and USR1. */
3537 allow_signal(SIGINT);
3538 allow_signal(SIGTERM);
3539 allow_signal(SIGKILL);
3540 allow_signal(SIGUSR1);
3541
3542 /* Allow the thread to be frozen */
3543 set_freezable();
3544
3545 /* Arrange for userspace references to be interpreted as kernel
3546 * pointers. That way we can pass a kernel pointer to a routine
3547 * that expects a __user pointer and it will work okay. */
3548 set_fs(get_ds());
3549
3550 /* The main loop */
3551 while (fsg->state != FSG_STATE_TERMINATED) {
3552 if (exception_in_progress(fsg) || signal_pending(current)) {
3553 handle_exception(fsg);
3554 continue;
3555 }
3556
3557 if (!fsg->running) {
3558 sleep_thread(fsg);
3559 continue;
3560 }
3561
3562 if (get_next_command(fsg))
3563 continue;
3564
3565 spin_lock_irq(&fsg->lock);
3566 if (!exception_in_progress(fsg))
3567 fsg->state = FSG_STATE_DATA_PHASE;
3568 spin_unlock_irq(&fsg->lock);
3569
3570 if (do_scsi_command(fsg) || finish_reply(fsg))
3571 continue;
3572
3573 spin_lock_irq(&fsg->lock);
3574 if (!exception_in_progress(fsg))
3575 fsg->state = FSG_STATE_STATUS_PHASE;
3576 spin_unlock_irq(&fsg->lock);
3577
3578 if (send_status(fsg))
3579 continue;
3580
3581 spin_lock_irq(&fsg->lock);
3582 if (!exception_in_progress(fsg))
3583 fsg->state = FSG_STATE_IDLE;
3584 spin_unlock_irq(&fsg->lock);
3585 }
3586
3587 spin_lock_irq(&fsg->lock);
3588 fsg->thread_task = NULL;
3589 spin_unlock_irq(&fsg->lock);
3590
3591 /* In case we are exiting because of a signal, unregister the
3592 * gadget driver and close the backing file. */
3593 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3594 usb_gadget_unregister_driver(&fsg_driver);
3595 close_all_backing_files(fsg);
3596 }
3597
3598 /* Let the unbind and cleanup routines know the thread has exited */
3599 complete_and_exit(&fsg->thread_notifier, 0);
3600 }
3601
3602
3603 /*-------------------------------------------------------------------------*/
3604
3605 /* If the next two routines are called while the gadget is registered,
3606 * the caller must own fsg->filesem for writing. */
3607
3608 static int open_backing_file(struct lun *curlun, const char *filename)
3609 {
3610 int ro;
3611 struct file *filp = NULL;
3612 int rc = -EINVAL;
3613 struct inode *inode = NULL;
3614 loff_t size;
3615 loff_t num_sectors;
3616 loff_t min_sectors;
3617
3618 /* R/W if we can, R/O if we must */
3619 ro = curlun->ro;
3620 if (!ro) {
3621 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3622 if (-EROFS == PTR_ERR(filp))
3623 ro = 1;
3624 }
3625 if (ro)
3626 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3627 if (IS_ERR(filp)) {
3628 LINFO(curlun, "unable to open backing file: %s\n", filename);
3629 return PTR_ERR(filp);
3630 }
3631
3632 if (!(filp->f_mode & FMODE_WRITE))
3633 ro = 1;
3634
3635 if (filp->f_path.dentry)
3636 inode = filp->f_path.dentry->d_inode;
3637 if (inode && S_ISBLK(inode->i_mode)) {
3638 if (bdev_read_only(inode->i_bdev))
3639 ro = 1;
3640 } else if (!inode || !S_ISREG(inode->i_mode)) {
3641 LINFO(curlun, "invalid file type: %s\n", filename);
3642 goto out;
3643 }
3644
3645 /* If we can't read the file, it's no good.
3646 * If we can't write the file, use it read-only. */
3647 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3648 LINFO(curlun, "file not readable: %s\n", filename);
3649 goto out;
3650 }
3651 if (!(filp->f_op->write || filp->f_op->aio_write))
3652 ro = 1;
3653
3654 size = i_size_read(inode->i_mapping->host);
3655 if (size < 0) {
3656 LINFO(curlun, "unable to find file size: %s\n", filename);
3657 rc = (int) size;
3658 goto out;
3659 }
3660 num_sectors = size >> 9; // File size in 512-byte blocks
3661 min_sectors = 1;
3662 if (mod_data.cdrom) {
3663 num_sectors &= ~3; // Reduce to a multiple of 2048
3664 min_sectors = 300*4; // Smallest track is 300 frames
3665 if (num_sectors >= 256*60*75*4) {
3666 num_sectors = (256*60*75 - 1) * 4;
3667 LINFO(curlun, "file too big: %s\n", filename);
3668 LINFO(curlun, "using only first %d blocks\n",
3669 (int) num_sectors);
3670 }
3671 }
3672 if (num_sectors < min_sectors) {
3673 LINFO(curlun, "file too small: %s\n", filename);
3674 rc = -ETOOSMALL;
3675 goto out;
3676 }
3677
3678 get_file(filp);
3679 curlun->ro = ro;
3680 curlun->filp = filp;
3681 curlun->file_length = size;
3682 curlun->num_sectors = num_sectors;
3683 LDBG(curlun, "open backing file: %s\n", filename);
3684 rc = 0;
3685
3686 out:
3687 filp_close(filp, current->files);
3688 return rc;
3689 }
3690
3691
3692 static void close_backing_file(struct lun *curlun)
3693 {
3694 if (curlun->filp) {
3695 LDBG(curlun, "close backing file\n");
3696 fput(curlun->filp);
3697 curlun->filp = NULL;
3698 }
3699 }
3700
3701 static void close_all_backing_files(struct fsg_dev *fsg)
3702 {
3703 int i;
3704
3705 for (i = 0; i < fsg->nluns; ++i)
3706 close_backing_file(&fsg->luns[i]);
3707 }
3708
3709
3710 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3711 {
3712 struct lun *curlun = dev_to_lun(dev);
3713
3714 return sprintf(buf, "%d\n", curlun->ro);
3715 }
3716
3717 static ssize_t show_file(struct device *dev, struct device_attribute *attr,
3718 char *buf)
3719 {
3720 struct lun *curlun = dev_to_lun(dev);
3721 struct fsg_dev *fsg = dev_get_drvdata(dev);
3722 char *p;
3723 ssize_t rc;
3724
3725 down_read(&fsg->filesem);
3726 if (backing_file_is_open(curlun)) { // Get the complete pathname
3727 p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
3728 if (IS_ERR(p))
3729 rc = PTR_ERR(p);
3730 else {
3731 rc = strlen(p);
3732 memmove(buf, p, rc);
3733 buf[rc] = '\n'; // Add a newline
3734 buf[++rc] = 0;
3735 }
3736 } else { // No file, return 0 bytes
3737 *buf = 0;
3738 rc = 0;
3739 }
3740 up_read(&fsg->filesem);
3741 return rc;
3742 }
3743
3744
3745 static ssize_t store_ro(struct device *dev, struct device_attribute *attr,
3746 const char *buf, size_t count)
3747 {
3748 ssize_t rc = count;
3749 struct lun *curlun = dev_to_lun(dev);
3750 struct fsg_dev *fsg = dev_get_drvdata(dev);
3751 int i;
3752
3753 if (sscanf(buf, "%d", &i) != 1)
3754 return -EINVAL;
3755
3756 /* Allow the write-enable status to change only while the backing file
3757 * is closed. */
3758 down_read(&fsg->filesem);
3759 if (backing_file_is_open(curlun)) {
3760 LDBG(curlun, "read-only status change prevented\n");
3761 rc = -EBUSY;
3762 } else {
3763 curlun->ro = !!i;
3764 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3765 }
3766 up_read(&fsg->filesem);
3767 return rc;
3768 }
3769
3770 static ssize_t store_file(struct device *dev, struct device_attribute *attr,
3771 const char *buf, size_t count)
3772 {
3773 struct lun *curlun = dev_to_lun(dev);
3774 struct fsg_dev *fsg = dev_get_drvdata(dev);
3775 int rc = 0;
3776
3777 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3778 LDBG(curlun, "eject attempt prevented\n");
3779 return -EBUSY; // "Door is locked"
3780 }
3781
3782 /* Remove a trailing newline */
3783 if (count > 0 && buf[count-1] == '\n')
3784 ((char *) buf)[count-1] = 0; // Ugh!
3785
3786 /* Eject current medium */
3787 down_write(&fsg->filesem);
3788 if (backing_file_is_open(curlun)) {
3789 close_backing_file(curlun);
3790 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3791 }
3792
3793 /* Load new medium */
3794 if (count > 0 && buf[0]) {
3795 rc = open_backing_file(curlun, buf);
3796 if (rc == 0)
3797 curlun->unit_attention_data =
3798 SS_NOT_READY_TO_READY_TRANSITION;
3799 }
3800 up_write(&fsg->filesem);
3801 return (rc < 0 ? rc : count);
3802 }
3803
3804
3805 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3806 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3807 static DEVICE_ATTR(file, 0444, show_file, NULL);
3808
3809
3810 /*-------------------------------------------------------------------------*/
3811
3812 static void fsg_release(struct kref *ref)
3813 {
3814 struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
3815
3816 kfree(fsg->luns);
3817 kfree(fsg);
3818 }
3819
3820 static void lun_release(struct device *dev)
3821 {
3822 struct fsg_dev *fsg = dev_get_drvdata(dev);
3823
3824 kref_put(&fsg->ref, fsg_release);
3825 }
3826
3827 static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
3828 {
3829 struct fsg_dev *fsg = get_gadget_data(gadget);
3830 int i;
3831 struct lun *curlun;
3832 struct usb_request *req = fsg->ep0req;
3833
3834 DBG(fsg, "unbind\n");
3835 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3836
3837 /* Unregister the sysfs attribute files and the LUNs */
3838 for (i = 0; i < fsg->nluns; ++i) {
3839 curlun = &fsg->luns[i];
3840 if (curlun->registered) {
3841 device_remove_file(&curlun->dev, &dev_attr_ro);
3842 device_remove_file(&curlun->dev, &dev_attr_file);
3843 device_unregister(&curlun->dev);
3844 curlun->registered = 0;
3845 }
3846 }
3847
3848 /* If the thread isn't already dead, tell it to exit now */
3849 if (fsg->state != FSG_STATE_TERMINATED) {
3850 raise_exception(fsg, FSG_STATE_EXIT);
3851 wait_for_completion(&fsg->thread_notifier);
3852
3853 /* The cleanup routine waits for this completion also */
3854 complete(&fsg->thread_notifier);
3855 }
3856
3857 /* Free the data buffers */
3858 for (i = 0; i < NUM_BUFFERS; ++i)
3859 kfree(fsg->buffhds[i].buf);
3860
3861 /* Free the request and buffer for endpoint 0 */
3862 if (req) {
3863 kfree(req->buf);
3864 usb_ep_free_request(fsg->ep0, req);
3865 }
3866
3867 set_gadget_data(gadget, NULL);
3868 }
3869
3870
3871 static int __init check_parameters(struct fsg_dev *fsg)
3872 {
3873 int prot;
3874 int gcnum;
3875
3876 /* Store the default values */
3877 mod_data.transport_type = USB_PR_BULK;
3878 mod_data.transport_name = "Bulk-only";
3879 mod_data.protocol_type = USB_SC_SCSI;
3880 mod_data.protocol_name = "Transparent SCSI";
3881
3882 /* Some peripheral controllers are known not to be able to
3883 * halt bulk endpoints correctly. If one of them is present,
3884 * disable stalls.
3885 */
3886 if (gadget_is_sh(fsg->gadget) || gadget_is_at91(fsg->gadget))
3887 mod_data.can_stall = 0;
3888
3889 if (mod_data.release == 0xffff) { // Parameter wasn't set
3890 /* The sa1100 controller is not supported */
3891 if (gadget_is_sa1100(fsg->gadget))
3892 gcnum = -1;
3893 else
3894 gcnum = usb_gadget_controller_number(fsg->gadget);
3895 if (gcnum >= 0)
3896 mod_data.release = 0x0300 + gcnum;
3897 else {
3898 WARNING(fsg, "controller '%s' not recognized\n",
3899 fsg->gadget->name);
3900 mod_data.release = 0x0399;
3901 }
3902 }
3903
3904 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3905
3906 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3907 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3908 ; // Use default setting
3909 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3910 mod_data.transport_type = USB_PR_CB;
3911 mod_data.transport_name = "Control-Bulk";
3912 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3913 mod_data.transport_type = USB_PR_CBI;
3914 mod_data.transport_name = "Control-Bulk-Interrupt";
3915 } else {
3916 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3917 return -EINVAL;
3918 }
3919
3920 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3921 prot == USB_SC_SCSI) {
3922 ; // Use default setting
3923 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3924 prot == USB_SC_RBC) {
3925 mod_data.protocol_type = USB_SC_RBC;
3926 mod_data.protocol_name = "RBC";
3927 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3928 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3929 prot == USB_SC_8020) {
3930 mod_data.protocol_type = USB_SC_8020;
3931 mod_data.protocol_name = "8020i (ATAPI)";
3932 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3933 prot == USB_SC_QIC) {
3934 mod_data.protocol_type = USB_SC_QIC;
3935 mod_data.protocol_name = "QIC-157";
3936 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3937 prot == USB_SC_UFI) {
3938 mod_data.protocol_type = USB_SC_UFI;
3939 mod_data.protocol_name = "UFI";
3940 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3941 prot == USB_SC_8070) {
3942 mod_data.protocol_type = USB_SC_8070;
3943 mod_data.protocol_name = "8070i";
3944 } else {
3945 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3946 return -EINVAL;
3947 }
3948
3949 mod_data.buflen &= PAGE_CACHE_MASK;
3950 if (mod_data.buflen <= 0) {
3951 ERROR(fsg, "invalid buflen\n");
3952 return -ETOOSMALL;
3953 }
3954 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3955
3956 return 0;
3957 }
3958
3959
3960 static int __init fsg_bind(struct usb_gadget *gadget)
3961 {
3962 struct fsg_dev *fsg = the_fsg;
3963 int rc;
3964 int i;
3965 struct lun *curlun;
3966 struct usb_ep *ep;
3967 struct usb_request *req;
3968 char *pathbuf, *p;
3969
3970 fsg->gadget = gadget;
3971 set_gadget_data(gadget, fsg);
3972 fsg->ep0 = gadget->ep0;
3973 fsg->ep0->driver_data = fsg;
3974
3975 if ((rc = check_parameters(fsg)) != 0)
3976 goto out;
3977
3978 if (mod_data.removable) { // Enable the store_xxx attributes
3979 dev_attr_file.attr.mode = 0644;
3980 dev_attr_file.store = store_file;
3981 if (!mod_data.cdrom) {
3982 dev_attr_ro.attr.mode = 0644;
3983 dev_attr_ro.store = store_ro;
3984 }
3985 }
3986
3987 /* Find out how many LUNs there should be */
3988 i = mod_data.nluns;
3989 if (i == 0)
3990 i = max(mod_data.num_filenames, 1u);
3991 if (i > MAX_LUNS) {
3992 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3993 rc = -EINVAL;
3994 goto out;
3995 }
3996
3997 /* Create the LUNs, open their backing files, and register the
3998 * LUN devices in sysfs. */
3999 fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
4000 if (!fsg->luns) {
4001 rc = -ENOMEM;
4002 goto out;
4003 }
4004 fsg->nluns = i;
4005
4006 for (i = 0; i < fsg->nluns; ++i) {
4007 curlun = &fsg->luns[i];
4008 curlun->ro = mod_data.ro[i];
4009 if (mod_data.cdrom)
4010 curlun->ro = 1;
4011 curlun->dev.release = lun_release;
4012 curlun->dev.parent = &gadget->dev;
4013 curlun->dev.driver = &fsg_driver.driver;
4014 dev_set_drvdata(&curlun->dev, fsg);
4015 dev_set_name(&curlun->dev,"%s-lun%d",
4016 dev_name(&gadget->dev), i);
4017
4018 if ((rc = device_register(&curlun->dev)) != 0) {
4019 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
4020 goto out;
4021 }
4022 if ((rc = device_create_file(&curlun->dev,
4023 &dev_attr_ro)) != 0 ||
4024 (rc = device_create_file(&curlun->dev,
4025 &dev_attr_file)) != 0) {
4026 device_unregister(&curlun->dev);
4027 goto out;
4028 }
4029 curlun->registered = 1;
4030 kref_get(&fsg->ref);
4031
4032 if (mod_data.file[i] && *mod_data.file[i]) {
4033 if ((rc = open_backing_file(curlun,
4034 mod_data.file[i])) != 0)
4035 goto out;
4036 } else if (!mod_data.removable) {
4037 ERROR(fsg, "no file given for LUN%d\n", i);
4038 rc = -EINVAL;
4039 goto out;
4040 }
4041 }
4042
4043 /* Find all the endpoints we will use */
4044 usb_ep_autoconfig_reset(gadget);
4045 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
4046 if (!ep)
4047 goto autoconf_fail;
4048 ep->driver_data = fsg; // claim the endpoint
4049 fsg->bulk_in = ep;
4050
4051 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
4052 if (!ep)
4053 goto autoconf_fail;
4054 ep->driver_data = fsg; // claim the endpoint
4055 fsg->bulk_out = ep;
4056
4057 if (transport_is_cbi()) {
4058 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
4059 if (!ep)
4060 goto autoconf_fail;
4061 ep->driver_data = fsg; // claim the endpoint
4062 fsg->intr_in = ep;
4063 }
4064
4065 /* Fix up the descriptors */
4066 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
4067 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
4068 device_desc.idProduct = cpu_to_le16(mod_data.product);
4069 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
4070
4071 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
4072 intf_desc.bNumEndpoints = i;
4073 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
4074 intf_desc.bInterfaceProtocol = mod_data.transport_type;
4075 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
4076
4077 if (gadget_is_dualspeed(gadget)) {
4078 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
4079
4080 /* Assume ep0 uses the same maxpacket value for both speeds */
4081 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
4082
4083 /* Assume endpoint addresses are the same for both speeds */
4084 hs_bulk_in_desc.bEndpointAddress =
4085 fs_bulk_in_desc.bEndpointAddress;
4086 hs_bulk_out_desc.bEndpointAddress =
4087 fs_bulk_out_desc.bEndpointAddress;
4088 hs_intr_in_desc.bEndpointAddress =
4089 fs_intr_in_desc.bEndpointAddress;
4090 }
4091
4092 if (gadget_is_otg(gadget))
4093 otg_desc.bmAttributes |= USB_OTG_HNP;
4094
4095 rc = -ENOMEM;
4096
4097 /* Allocate the request and buffer for endpoint 0 */
4098 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
4099 if (!req)
4100 goto out;
4101 req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL);
4102 if (!req->buf)
4103 goto out;
4104 req->complete = ep0_complete;
4105
4106 /* Allocate the data buffers */
4107 for (i = 0; i < NUM_BUFFERS; ++i) {
4108 struct fsg_buffhd *bh = &fsg->buffhds[i];
4109
4110 /* Allocate for the bulk-in endpoint. We assume that
4111 * the buffer will also work with the bulk-out (and
4112 * interrupt-in) endpoint. */
4113 bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL);
4114 if (!bh->buf)
4115 goto out;
4116 bh->next = bh + 1;
4117 }
4118 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
4119
4120 /* This should reflect the actual gadget power source */
4121 usb_gadget_set_selfpowered(gadget);
4122
4123 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
4124 init_utsname()->sysname, init_utsname()->release,
4125 gadget->name);
4126
4127 /* On a real device, serial[] would be loaded from permanent
4128 * storage. We just encode it from the driver version string. */
4129 for (i = 0; i < sizeof(serial) - 2; i += 2) {
4130 unsigned char c = DRIVER_VERSION[i / 2];
4131
4132 if (!c)
4133 break;
4134 sprintf(&serial[i], "%02X", c);
4135 }
4136
4137 fsg->thread_task = kthread_create(fsg_main_thread, fsg,
4138 "file-storage-gadget");
4139 if (IS_ERR(fsg->thread_task)) {
4140 rc = PTR_ERR(fsg->thread_task);
4141 goto out;
4142 }
4143
4144 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
4145 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
4146
4147 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
4148 for (i = 0; i < fsg->nluns; ++i) {
4149 curlun = &fsg->luns[i];
4150 if (backing_file_is_open(curlun)) {
4151 p = NULL;
4152 if (pathbuf) {
4153 p = d_path(&curlun->filp->f_path,
4154 pathbuf, PATH_MAX);
4155 if (IS_ERR(p))
4156 p = NULL;
4157 }
4158 LINFO(curlun, "ro=%d, file: %s\n",
4159 curlun->ro, (p ? p : "(error)"));
4160 }
4161 }
4162 kfree(pathbuf);
4163
4164 DBG(fsg, "transport=%s (x%02x)\n",
4165 mod_data.transport_name, mod_data.transport_type);
4166 DBG(fsg, "protocol=%s (x%02x)\n",
4167 mod_data.protocol_name, mod_data.protocol_type);
4168 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4169 mod_data.vendor, mod_data.product, mod_data.release);
4170 DBG(fsg, "removable=%d, stall=%d, cdrom=%d, buflen=%u\n",
4171 mod_data.removable, mod_data.can_stall,
4172 mod_data.cdrom, mod_data.buflen);
4173 DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task));
4174
4175 set_bit(REGISTERED, &fsg->atomic_bitflags);
4176
4177 /* Tell the thread to start working */
4178 wake_up_process(fsg->thread_task);
4179 return 0;
4180
4181 autoconf_fail:
4182 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4183 rc = -ENOTSUPP;
4184
4185 out:
4186 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4187 fsg_unbind(gadget);
4188 close_all_backing_files(fsg);
4189 complete(&fsg->thread_notifier);
4190 return rc;
4191 }
4192
4193
4194 /*-------------------------------------------------------------------------*/
4195
4196 static void fsg_suspend(struct usb_gadget *gadget)
4197 {
4198 struct fsg_dev *fsg = get_gadget_data(gadget);
4199
4200 DBG(fsg, "suspend\n");
4201 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4202 }
4203
4204 static void fsg_resume(struct usb_gadget *gadget)
4205 {
4206 struct fsg_dev *fsg = get_gadget_data(gadget);
4207
4208 DBG(fsg, "resume\n");
4209 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4210 }
4211
4212
4213 /*-------------------------------------------------------------------------*/
4214
4215 static struct usb_gadget_driver fsg_driver = {
4216 #ifdef CONFIG_USB_GADGET_DUALSPEED
4217 .speed = USB_SPEED_HIGH,
4218 #else
4219 .speed = USB_SPEED_FULL,
4220 #endif
4221 .function = (char *) longname,
4222 .bind = fsg_bind,
4223 .unbind = fsg_unbind,
4224 .disconnect = fsg_disconnect,
4225 .setup = fsg_setup,
4226 .suspend = fsg_suspend,
4227 .resume = fsg_resume,
4228
4229 .driver = {
4230 .name = (char *) shortname,
4231 .owner = THIS_MODULE,
4232 // .release = ...
4233 // .suspend = ...
4234 // .resume = ...
4235 },
4236 };
4237
4238
4239 static int __init fsg_alloc(void)
4240 {
4241 struct fsg_dev *fsg;
4242
4243 fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
4244 if (!fsg)
4245 return -ENOMEM;
4246 spin_lock_init(&fsg->lock);
4247 init_rwsem(&fsg->filesem);
4248 kref_init(&fsg->ref);
4249 init_completion(&fsg->thread_notifier);
4250
4251 the_fsg = fsg;
4252 return 0;
4253 }
4254
4255
4256 static int __init fsg_init(void)
4257 {
4258 int rc;
4259 struct fsg_dev *fsg;
4260
4261 if ((rc = fsg_alloc()) != 0)
4262 return rc;
4263 fsg = the_fsg;
4264 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0)
4265 kref_put(&fsg->ref, fsg_release);
4266 return rc;
4267 }
4268 module_init(fsg_init);
4269
4270
4271 static void __exit fsg_cleanup(void)
4272 {
4273 struct fsg_dev *fsg = the_fsg;
4274
4275 /* Unregister the driver iff the thread hasn't already done so */
4276 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4277 usb_gadget_unregister_driver(&fsg_driver);
4278
4279 /* Wait for the thread to finish up */
4280 wait_for_completion(&fsg->thread_notifier);
4281
4282 close_all_backing_files(fsg);
4283 kref_put(&fsg->ref, fsg_release);
4284 }
4285 module_exit(fsg_cleanup);
Linux kernel - Deliverables
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