Commit | Line | Data |
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1da177e4 LT |
1 | /* Driver for USB Mass Storage compliant devices |
2 | * SCSI layer glue code | |
3 | * | |
1da177e4 LT |
4 | * Current development and maintenance by: |
5 | * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
6 | * | |
7 | * Developed with the assistance of: | |
8 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
9 | * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) | |
10 | * | |
11 | * Initial work by: | |
12 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
13 | * | |
14 | * This driver is based on the 'USB Mass Storage Class' document. This | |
15 | * describes in detail the protocol used to communicate with such | |
16 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
17 | * mind when they created this document. The commands are all very | |
18 | * similar to commands in the SCSI-II and ATAPI specifications. | |
19 | * | |
20 | * It is important to note that in a number of cases this class | |
21 | * exhibits class-specific exemptions from the USB specification. | |
22 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
23 | * that they are used to communicate wait, failed and OK on commands. | |
24 | * | |
25 | * Also, for certain devices, the interrupt endpoint is used to convey | |
26 | * status of a command. | |
27 | * | |
28 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
29 | * information about this driver. | |
30 | * | |
31 | * This program is free software; you can redistribute it and/or modify it | |
32 | * under the terms of the GNU General Public License as published by the | |
33 | * Free Software Foundation; either version 2, or (at your option) any | |
34 | * later version. | |
35 | * | |
36 | * This program is distributed in the hope that it will be useful, but | |
37 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
39 | * General Public License for more details. | |
40 | * | |
41 | * You should have received a copy of the GNU General Public License along | |
42 | * with this program; if not, write to the Free Software Foundation, Inc., | |
43 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
44 | */ | |
45 | ||
1da177e4 | 46 | #include <linux/module.h> |
4186ecf8 | 47 | #include <linux/mutex.h> |
1da177e4 LT |
48 | |
49 | #include <scsi/scsi.h> | |
50 | #include <scsi/scsi_cmnd.h> | |
51 | #include <scsi/scsi_devinfo.h> | |
52 | #include <scsi/scsi_device.h> | |
53 | #include <scsi/scsi_eh.h> | |
54 | ||
55 | #include "usb.h" | |
56 | #include "scsiglue.h" | |
57 | #include "debug.h" | |
58 | #include "transport.h" | |
59 | #include "protocol.h" | |
60 | ||
a81a81a2 AS |
61 | /* Vendor IDs for companies that seem to include the READ CAPACITY bug |
62 | * in all their devices | |
63 | */ | |
64 | #define VENDOR_ID_NOKIA 0x0421 | |
65 | #define VENDOR_ID_NIKON 0x04b0 | |
506e9469 | 66 | #define VENDOR_ID_PENTAX 0x0a17 |
a81a81a2 AS |
67 | #define VENDOR_ID_MOTOROLA 0x22b8 |
68 | ||
1da177e4 LT |
69 | /*********************************************************************** |
70 | * Host functions | |
71 | ***********************************************************************/ | |
72 | ||
73 | static const char* host_info(struct Scsi_Host *host) | |
74 | { | |
00fa43ef MW |
75 | struct us_data *us = host_to_us(host); |
76 | return us->scsi_name; | |
1da177e4 LT |
77 | } |
78 | ||
79 | static int slave_alloc (struct scsi_device *sdev) | |
80 | { | |
3a3416b1 AS |
81 | struct us_data *us = host_to_us(sdev->host); |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Set the INQUIRY transfer length to 36. We don't use any of | |
85 | * the extra data and many devices choke if asked for more or | |
86 | * less than 36 bytes. | |
87 | */ | |
88 | sdev->inquiry_len = 36; | |
3a3416b1 | 89 | |
f756cbd4 AS |
90 | /* USB has unusual DMA-alignment requirements: Although the |
91 | * starting address of each scatter-gather element doesn't matter, | |
92 | * the length of each element except the last must be divisible | |
93 | * by the Bulk maxpacket value. There's currently no way to | |
94 | * express this by block-layer constraints, so we'll cop out | |
95 | * and simply require addresses to be aligned at 512-byte | |
96 | * boundaries. This is okay since most block I/O involves | |
97 | * hardware sectors that are multiples of 512 bytes in length, | |
98 | * and since host controllers up through USB 2.0 have maxpacket | |
99 | * values no larger than 512. | |
100 | * | |
101 | * But it doesn't suffice for Wireless USB, where Bulk maxpacket | |
102 | * values can be as large as 2048. To make that work properly | |
103 | * will require changes to the block layer. | |
148d9fe4 | 104 | */ |
f756cbd4 | 105 | blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); |
465ff318 | 106 | |
3a3416b1 AS |
107 | /* |
108 | * The UFI spec treates the Peripheral Qualifier bits in an | |
109 | * INQUIRY result as reserved and requires devices to set them | |
110 | * to 0. However the SCSI spec requires these bits to be set | |
111 | * to 3 to indicate when a LUN is not present. | |
112 | * | |
113 | * Let the scanning code know if this target merely sets | |
114 | * Peripheral Device Type to 0x1f to indicate no LUN. | |
115 | */ | |
116 | if (us->subclass == US_SC_UFI) | |
117 | sdev->sdev_target->pdt_1f_for_no_lun = 1; | |
118 | ||
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | ||
122 | static int slave_configure(struct scsi_device *sdev) | |
123 | { | |
124 | struct us_data *us = host_to_us(sdev->host); | |
125 | ||
883d989a PD |
126 | /* Many devices have trouble transfering more than 32KB at a time, |
127 | * while others have trouble with more than 64K. At this time we | |
128 | * are limiting both to 32K (64 sectores). | |
129 | */ | |
7e4d6c38 | 130 | if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { |
33abc04f DM |
131 | unsigned int max_sectors = 64; |
132 | ||
7e4d6c38 | 133 | if (us->fflags & US_FL_MAX_SECTORS_MIN) |
33abc04f | 134 | max_sectors = PAGE_CACHE_SIZE >> 9; |
49d6271b | 135 | if (queue_max_hw_sectors(sdev->request_queue) > max_sectors) |
086fa5ff | 136 | blk_queue_max_hw_sectors(sdev->request_queue, |
33abc04f | 137 | max_sectors); |
5c16034d AS |
138 | } else if (sdev->type == TYPE_TAPE) { |
139 | /* Tapes need much higher max_sector limits, so just | |
140 | * raise it to the maximum possible (4 GB / 512) and | |
141 | * let the queue segment size sort out the real limit. | |
142 | */ | |
086fa5ff | 143 | blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); |
33abc04f | 144 | } |
1da177e4 | 145 | |
96983d2d AS |
146 | /* Some USB host controllers can't do DMA; they have to use PIO. |
147 | * They indicate this by setting their dma_mask to NULL. For | |
148 | * such controllers we need to make sure the block layer sets | |
149 | * up bounce buffers in addressable memory. | |
150 | */ | |
151 | if (!us->pusb_dev->bus->controller->dma_mask) | |
152 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH); | |
153 | ||
1da177e4 LT |
154 | /* We can't put these settings in slave_alloc() because that gets |
155 | * called before the device type is known. Consequently these | |
156 | * settings can't be overridden via the scsi devinfo mechanism. */ | |
157 | if (sdev->type == TYPE_DISK) { | |
158 | ||
a81a81a2 AS |
159 | /* Some vendors seem to put the READ CAPACITY bug into |
160 | * all their devices -- primarily makers of cell phones | |
161 | * and digital cameras. Since these devices always use | |
162 | * flash media and can be expected to have an even number | |
163 | * of sectors, we will always enable the CAPACITY_HEURISTICS | |
164 | * flag unless told otherwise. */ | |
165 | switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) { | |
166 | case VENDOR_ID_NOKIA: | |
167 | case VENDOR_ID_NIKON: | |
506e9469 | 168 | case VENDOR_ID_PENTAX: |
a81a81a2 AS |
169 | case VENDOR_ID_MOTOROLA: |
170 | if (!(us->fflags & (US_FL_FIX_CAPACITY | | |
171 | US_FL_CAPACITY_OK))) | |
172 | us->fflags |= US_FL_CAPACITY_HEURISTICS; | |
173 | break; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* Disk-type devices use MODE SENSE(6) if the protocol |
177 | * (SubClass) is Transparent SCSI, otherwise they use | |
178 | * MODE SENSE(10). */ | |
d277064e | 179 | if (us->subclass != US_SC_SCSI && us->subclass != US_SC_CYP_ATACB) |
1da177e4 LT |
180 | sdev->use_10_for_ms = 1; |
181 | ||
182 | /* Many disks only accept MODE SENSE transfer lengths of | |
183 | * 192 bytes (that's what Windows uses). */ | |
184 | sdev->use_192_bytes_for_3f = 1; | |
185 | ||
186 | /* Some devices don't like MODE SENSE with page=0x3f, | |
187 | * which is the command used for checking if a device | |
188 | * is write-protected. Now that we tell the sd driver | |
189 | * to do a 192-byte transfer with this command the | |
190 | * majority of devices work fine, but a few still can't | |
191 | * handle it. The sd driver will simply assume those | |
192 | * devices are write-enabled. */ | |
7e4d6c38 | 193 | if (us->fflags & US_FL_NO_WP_DETECT) |
1da177e4 LT |
194 | sdev->skip_ms_page_3f = 1; |
195 | ||
196 | /* A number of devices have problems with MODE SENSE for | |
197 | * page x08, so we will skip it. */ | |
198 | sdev->skip_ms_page_8 = 1; | |
199 | ||
200 | /* Some disks return the total number of blocks in response | |
201 | * to READ CAPACITY rather than the highest block number. | |
202 | * If this device makes that mistake, tell the sd driver. */ | |
7e4d6c38 | 203 | if (us->fflags & US_FL_FIX_CAPACITY) |
1da177e4 | 204 | sdev->fix_capacity = 1; |
86dbde9c | 205 | |
61bf54b7 ON |
206 | /* A few disks have two indistinguishable version, one of |
207 | * which reports the correct capacity and the other does not. | |
208 | * The sd driver has to guess which is the case. */ | |
7e4d6c38 | 209 | if (us->fflags & US_FL_CAPACITY_HEURISTICS) |
61bf54b7 ON |
210 | sdev->guess_capacity = 1; |
211 | ||
1537e0ad BE |
212 | /* assume SPC3 or latter devices support sense size > 18 */ |
213 | if (sdev->scsi_level > SCSI_SPC_2) | |
214 | us->fflags |= US_FL_SANE_SENSE; | |
215 | ||
a4e62832 MD |
216 | /* Some devices report a SCSI revision level above 2 but are |
217 | * unable to handle the REPORT LUNS command (for which | |
218 | * support is mandatory at level 3). Since we already have | |
219 | * a Get-Max-LUN request, we won't lose much by setting the | |
220 | * revision level down to 2. The only devices that would be | |
221 | * affected are those with sparse LUNs. */ | |
f3f49065 AS |
222 | if (sdev->scsi_level > SCSI_2) |
223 | sdev->sdev_target->scsi_level = | |
224 | sdev->scsi_level = SCSI_2; | |
a4e62832 | 225 | |
86dbde9c MD |
226 | /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable |
227 | * Hardware Error) when any low-level error occurs, | |
228 | * recoverable or not. Setting this flag tells the SCSI | |
229 | * midlayer to retry such commands, which frequently will | |
230 | * succeed and fix the error. The worst this can lead to | |
231 | * is an occasional series of retries that will all fail. */ | |
232 | sdev->retry_hwerror = 1; | |
233 | ||
f09e495d MCC |
234 | /* USB disks should allow restart. Some drives spin down |
235 | * automatically, requiring a START-STOP UNIT command. */ | |
236 | sdev->allow_restart = 1; | |
237 | ||
23c3e290 HG |
238 | /* Some USB cardreaders have trouble reading an sdcard's last |
239 | * sector in a larger then 1 sector read, since the performance | |
240 | * impact is negible we set this flag for all USB disks */ | |
241 | sdev->last_sector_bug = 1; | |
25ff1c31 AS |
242 | |
243 | /* Enable last-sector hacks for single-target devices using | |
244 | * the Bulk-only transport, unless we already know the | |
245 | * capacity will be decremented or is correct. */ | |
246 | if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | | |
247 | US_FL_SCM_MULT_TARG)) && | |
248 | us->protocol == US_PR_BULK) | |
249 | us->use_last_sector_hacks = 1; | |
1da177e4 LT |
250 | } else { |
251 | ||
252 | /* Non-disk-type devices don't need to blacklist any pages | |
253 | * or to force 192-byte transfer lengths for MODE SENSE. | |
254 | * But they do need to use MODE SENSE(10). */ | |
255 | sdev->use_10_for_ms = 1; | |
256 | } | |
257 | ||
f3f49065 AS |
258 | /* The CB and CBI transports have no way to pass LUN values |
259 | * other than the bits in the second byte of a CDB. But those | |
260 | * bits don't get set to the LUN value if the device reports | |
261 | * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily | |
262 | * be single-LUN. | |
263 | */ | |
264 | if ((us->protocol == US_PR_CB || us->protocol == US_PR_CBI) && | |
265 | sdev->scsi_level == SCSI_UNKNOWN) | |
266 | us->max_lun = 0; | |
267 | ||
1da177e4 LT |
268 | /* Some devices choke when they receive a PREVENT-ALLOW MEDIUM |
269 | * REMOVAL command, so suppress those commands. */ | |
7e4d6c38 | 270 | if (us->fflags & US_FL_NOT_LOCKABLE) |
1da177e4 LT |
271 | sdev->lockable = 0; |
272 | ||
273 | /* this is to satisfy the compiler, tho I don't think the | |
274 | * return code is ever checked anywhere. */ | |
275 | return 0; | |
276 | } | |
277 | ||
278 | /* queue a command */ | |
279 | /* This is always called with scsi_lock(host) held */ | |
280 | static int queuecommand(struct scsi_cmnd *srb, | |
281 | void (*done)(struct scsi_cmnd *)) | |
282 | { | |
283 | struct us_data *us = host_to_us(srb->device->host); | |
284 | ||
441b62c1 | 285 | US_DEBUGP("%s called\n", __func__); |
1da177e4 LT |
286 | |
287 | /* check for state-transition errors */ | |
288 | if (us->srb != NULL) { | |
289 | printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n", | |
441b62c1 | 290 | __func__, us->srb); |
1da177e4 LT |
291 | return SCSI_MLQUEUE_HOST_BUSY; |
292 | } | |
293 | ||
294 | /* fail the command if we are disconnecting */ | |
7e4d6c38 | 295 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
1da177e4 LT |
296 | US_DEBUGP("Fail command during disconnect\n"); |
297 | srb->result = DID_NO_CONNECT << 16; | |
298 | done(srb); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /* enqueue the command and wake up the control thread */ | |
303 | srb->scsi_done = done; | |
304 | us->srb = srb; | |
7119e3c3 | 305 | complete(&us->cmnd_ready); |
1da177e4 LT |
306 | |
307 | return 0; | |
308 | } | |
309 | ||
310 | /*********************************************************************** | |
311 | * Error handling functions | |
312 | ***********************************************************************/ | |
313 | ||
314 | /* Command timeout and abort */ | |
1da177e4 LT |
315 | static int command_abort(struct scsi_cmnd *srb) |
316 | { | |
317 | struct us_data *us = host_to_us(srb->device->host); | |
318 | ||
441b62c1 | 319 | US_DEBUGP("%s called\n", __func__); |
1da177e4 | 320 | |
226173ed MD |
321 | /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING |
322 | * bits are protected by the host lock. */ | |
323 | scsi_lock(us_to_host(us)); | |
324 | ||
1da177e4 LT |
325 | /* Is this command still active? */ |
326 | if (us->srb != srb) { | |
226173ed | 327 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
328 | US_DEBUGP ("-- nothing to abort\n"); |
329 | return FAILED; | |
330 | } | |
331 | ||
332 | /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if | |
333 | * a device reset isn't already in progress (to avoid interfering | |
226173ed MD |
334 | * with the reset). Note that we must retain the host lock while |
335 | * calling usb_stor_stop_transport(); otherwise it might interfere | |
336 | * with an auto-reset that begins as soon as we release the lock. */ | |
7e4d6c38 AS |
337 | set_bit(US_FLIDX_TIMED_OUT, &us->dflags); |
338 | if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { | |
339 | set_bit(US_FLIDX_ABORTING, &us->dflags); | |
1da177e4 LT |
340 | usb_stor_stop_transport(us); |
341 | } | |
226173ed | 342 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
343 | |
344 | /* Wait for the aborted command to finish */ | |
345 | wait_for_completion(&us->notify); | |
1da177e4 LT |
346 | return SUCCESS; |
347 | } | |
348 | ||
349 | /* This invokes the transport reset mechanism to reset the state of the | |
350 | * device */ | |
1da177e4 LT |
351 | static int device_reset(struct scsi_cmnd *srb) |
352 | { | |
353 | struct us_data *us = host_to_us(srb->device->host); | |
354 | int result; | |
355 | ||
441b62c1 | 356 | US_DEBUGP("%s called\n", __func__); |
1da177e4 | 357 | |
d526875d GKH |
358 | /* lock the device pointers and do the reset */ |
359 | mutex_lock(&(us->dev_mutex)); | |
360 | result = us->transport_reset(us); | |
361 | mutex_unlock(&us->dev_mutex); | |
1da177e4 | 362 | |
4d07ef76 | 363 | return result < 0 ? FAILED : SUCCESS; |
1da177e4 LT |
364 | } |
365 | ||
4d07ef76 | 366 | /* Simulate a SCSI bus reset by resetting the device's USB port. */ |
1da177e4 LT |
367 | static int bus_reset(struct scsi_cmnd *srb) |
368 | { | |
369 | struct us_data *us = host_to_us(srb->device->host); | |
4d07ef76 | 370 | int result; |
1da177e4 | 371 | |
441b62c1 | 372 | US_DEBUGP("%s called\n", __func__); |
4d07ef76 | 373 | result = usb_stor_port_reset(us); |
1da177e4 LT |
374 | return result < 0 ? FAILED : SUCCESS; |
375 | } | |
376 | ||
377 | /* Report a driver-initiated device reset to the SCSI layer. | |
378 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. | |
379 | * The caller must own the SCSI host lock. */ | |
380 | void usb_stor_report_device_reset(struct us_data *us) | |
381 | { | |
382 | int i; | |
383 | struct Scsi_Host *host = us_to_host(us); | |
384 | ||
385 | scsi_report_device_reset(host, 0, 0); | |
7e4d6c38 | 386 | if (us->fflags & US_FL_SCM_MULT_TARG) { |
1da177e4 LT |
387 | for (i = 1; i < host->max_id; ++i) |
388 | scsi_report_device_reset(host, 0, i); | |
389 | } | |
390 | } | |
391 | ||
4d07ef76 MD |
392 | /* Report a driver-initiated bus reset to the SCSI layer. |
393 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. | |
f07600cf | 394 | * The caller must not own the SCSI host lock. */ |
4d07ef76 MD |
395 | void usb_stor_report_bus_reset(struct us_data *us) |
396 | { | |
f07600cf AS |
397 | struct Scsi_Host *host = us_to_host(us); |
398 | ||
399 | scsi_lock(host); | |
400 | scsi_report_bus_reset(host, 0); | |
401 | scsi_unlock(host); | |
4d07ef76 MD |
402 | } |
403 | ||
1da177e4 LT |
404 | /*********************************************************************** |
405 | * /proc/scsi/ functions | |
406 | ***********************************************************************/ | |
407 | ||
408 | /* we use this macro to help us write into the buffer */ | |
409 | #undef SPRINTF | |
410 | #define SPRINTF(args...) \ | |
411 | do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0) | |
412 | ||
413 | static int proc_info (struct Scsi_Host *host, char *buffer, | |
414 | char **start, off_t offset, int length, int inout) | |
415 | { | |
416 | struct us_data *us = host_to_us(host); | |
417 | char *pos = buffer; | |
418 | const char *string; | |
419 | ||
420 | /* if someone is sending us data, just throw it away */ | |
421 | if (inout) | |
422 | return length; | |
423 | ||
424 | /* print the controller name */ | |
425 | SPRINTF(" Host scsi%d: usb-storage\n", host->host_no); | |
426 | ||
427 | /* print product, vendor, and serial number strings */ | |
428 | if (us->pusb_dev->manufacturer) | |
429 | string = us->pusb_dev->manufacturer; | |
430 | else if (us->unusual_dev->vendorName) | |
431 | string = us->unusual_dev->vendorName; | |
432 | else | |
433 | string = "Unknown"; | |
434 | SPRINTF(" Vendor: %s\n", string); | |
435 | if (us->pusb_dev->product) | |
436 | string = us->pusb_dev->product; | |
437 | else if (us->unusual_dev->productName) | |
438 | string = us->unusual_dev->productName; | |
439 | else | |
440 | string = "Unknown"; | |
441 | SPRINTF(" Product: %s\n", string); | |
442 | if (us->pusb_dev->serial) | |
443 | string = us->pusb_dev->serial; | |
444 | else | |
445 | string = "None"; | |
446 | SPRINTF("Serial Number: %s\n", string); | |
447 | ||
448 | /* show the protocol and transport */ | |
449 | SPRINTF(" Protocol: %s\n", us->protocol_name); | |
450 | SPRINTF(" Transport: %s\n", us->transport_name); | |
451 | ||
452 | /* show the device flags */ | |
453 | if (pos < buffer + length) { | |
454 | pos += sprintf(pos, " Quirks:"); | |
455 | ||
456 | #define US_FLAG(name, value) \ | |
7e4d6c38 | 457 | if (us->fflags & value) pos += sprintf(pos, " " #name); |
1da177e4 LT |
458 | US_DO_ALL_FLAGS |
459 | #undef US_FLAG | |
460 | ||
461 | *(pos++) = '\n'; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Calculate start of next buffer, and return value. | |
466 | */ | |
467 | *start = buffer + offset; | |
468 | ||
469 | if ((pos - buffer) < offset) | |
470 | return (0); | |
471 | else if ((pos - buffer - offset) < length) | |
472 | return (pos - buffer - offset); | |
473 | else | |
474 | return (length); | |
475 | } | |
476 | ||
477 | /*********************************************************************** | |
478 | * Sysfs interface | |
479 | ***********************************************************************/ | |
480 | ||
481 | /* Output routine for the sysfs max_sectors file */ | |
060b8845 | 482 | static ssize_t show_max_sectors(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
483 | { |
484 | struct scsi_device *sdev = to_scsi_device(dev); | |
485 | ||
49d6271b | 486 | return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue)); |
1da177e4 LT |
487 | } |
488 | ||
489 | /* Input routine for the sysfs max_sectors file */ | |
060b8845 | 490 | static ssize_t store_max_sectors(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
491 | size_t count) |
492 | { | |
493 | struct scsi_device *sdev = to_scsi_device(dev); | |
494 | unsigned short ms; | |
495 | ||
49d6271b | 496 | if (sscanf(buf, "%hu", &ms) > 0) { |
086fa5ff | 497 | blk_queue_max_hw_sectors(sdev->request_queue, ms); |
49d6271b | 498 | return count; |
1da177e4 LT |
499 | } |
500 | return -EINVAL; | |
501 | } | |
502 | ||
503 | static DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors, | |
504 | store_max_sectors); | |
505 | ||
506 | static struct device_attribute *sysfs_device_attr_list[] = { | |
507 | &dev_attr_max_sectors, | |
508 | NULL, | |
509 | }; | |
510 | ||
511 | /* | |
512 | * this defines our host template, with which we'll allocate hosts | |
513 | */ | |
514 | ||
515 | struct scsi_host_template usb_stor_host_template = { | |
516 | /* basic userland interface stuff */ | |
517 | .name = "usb-storage", | |
518 | .proc_name = "usb-storage", | |
519 | .proc_info = proc_info, | |
520 | .info = host_info, | |
521 | ||
522 | /* command interface -- queued only */ | |
523 | .queuecommand = queuecommand, | |
524 | ||
525 | /* error and abort handlers */ | |
526 | .eh_abort_handler = command_abort, | |
527 | .eh_device_reset_handler = device_reset, | |
528 | .eh_bus_reset_handler = bus_reset, | |
529 | ||
530 | /* queue commands only, only one command per LUN */ | |
531 | .can_queue = 1, | |
532 | .cmd_per_lun = 1, | |
533 | ||
534 | /* unknown initiator id */ | |
535 | .this_id = -1, | |
536 | ||
537 | .slave_alloc = slave_alloc, | |
538 | .slave_configure = slave_configure, | |
539 | ||
540 | /* lots of sg segments can be handled */ | |
49d6271b | 541 | .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS, |
1da177e4 LT |
542 | |
543 | /* limit the total size of a transfer to 120 KB */ | |
544 | .max_sectors = 240, | |
545 | ||
546 | /* merge commands... this seems to help performance, but | |
547 | * periodically someone should test to see which setting is more | |
548 | * optimal. | |
549 | */ | |
550 | .use_clustering = 1, | |
551 | ||
552 | /* emulated HBA */ | |
553 | .emulated = 1, | |
554 | ||
555 | /* we do our own delay after a device or bus reset */ | |
556 | .skip_settle_delay = 1, | |
557 | ||
558 | /* sysfs device attributes */ | |
559 | .sdev_attrs = sysfs_device_attr_list, | |
560 | ||
561 | /* module management */ | |
562 | .module = THIS_MODULE | |
563 | }; | |
564 | ||
565 | /* To Report "Illegal Request: Invalid Field in CDB */ | |
566 | unsigned char usb_stor_sense_invalidCDB[18] = { | |
567 | [0] = 0x70, /* current error */ | |
568 | [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ | |
569 | [7] = 0x0a, /* additional length */ | |
570 | [12] = 0x24 /* Invalid Field in CDB */ | |
571 | }; | |
e6e244b6 | 572 | EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); |