Branch data Line data Source code
1 : : /* Driver for USB Mass Storage compliant devices
2 : : * SCSI layer glue code
3 : : *
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 : :
46 : : #include <linux/module.h>
47 : : #include <linux/mutex.h>
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 : :
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
66 : : #define VENDOR_ID_PENTAX 0x0a17
67 : : #define VENDOR_ID_MOTOROLA 0x22b8
68 : :
69 : : /***********************************************************************
70 : : * Host functions
71 : : ***********************************************************************/
72 : :
73 : 0 : static const char* host_info(struct Scsi_Host *host)
74 : : {
75 : : struct us_data *us = host_to_us(host);
76 : 0 : return us->scsi_name;
77 : : }
78 : :
79 : 0 : static int slave_alloc (struct scsi_device *sdev)
80 : : {
81 : : /*
82 : : * Set the INQUIRY transfer length to 36. We don't use any of
83 : : * the extra data and many devices choke if asked for more or
84 : : * less than 36 bytes.
85 : : */
86 : 0 : sdev->inquiry_len = 36;
87 : :
88 : : /* USB has unusual DMA-alignment requirements: Although the
89 : : * starting address of each scatter-gather element doesn't matter,
90 : : * the length of each element except the last must be divisible
91 : : * by the Bulk maxpacket value. There's currently no way to
92 : : * express this by block-layer constraints, so we'll cop out
93 : : * and simply require addresses to be aligned at 512-byte
94 : : * boundaries. This is okay since most block I/O involves
95 : : * hardware sectors that are multiples of 512 bytes in length,
96 : : * and since host controllers up through USB 2.0 have maxpacket
97 : : * values no larger than 512.
98 : : *
99 : : * But it doesn't suffice for Wireless USB, where Bulk maxpacket
100 : : * values can be as large as 2048. To make that work properly
101 : : * will require changes to the block layer.
102 : : */
103 : 0 : blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
104 : :
105 : 0 : return 0;
106 : : }
107 : :
108 : 0 : static int slave_configure(struct scsi_device *sdev)
109 : : {
110 : 0 : struct us_data *us = host_to_us(sdev->host);
111 : :
112 : : /* Many devices have trouble transferring more than 32KB at a time,
113 : : * while others have trouble with more than 64K. At this time we
114 : : * are limiting both to 32K (64 sectores).
115 : : */
116 [ # # ]: 0 : if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
117 : : unsigned int max_sectors = 64;
118 : :
119 [ # # ]: 0 : if (us->fflags & US_FL_MAX_SECTORS_MIN)
120 : : max_sectors = PAGE_CACHE_SIZE >> 9;
121 [ # # ]: 0 : if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
122 : 0 : blk_queue_max_hw_sectors(sdev->request_queue,
123 : : max_sectors);
124 [ # # ]: 0 : } else if (sdev->type == TYPE_TAPE) {
125 : : /* Tapes need much higher max_sector limits, so just
126 : : * raise it to the maximum possible (4 GB / 512) and
127 : : * let the queue segment size sort out the real limit.
128 : : */
129 : 0 : blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
130 : : }
131 : :
132 : : /* Some USB host controllers can't do DMA; they have to use PIO.
133 : : * They indicate this by setting their dma_mask to NULL. For
134 : : * such controllers we need to make sure the block layer sets
135 : : * up bounce buffers in addressable memory.
136 : : */
137 [ # # ]: 0 : if (!us->pusb_dev->bus->controller->dma_mask)
138 : 0 : blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
139 : :
140 : : /* We can't put these settings in slave_alloc() because that gets
141 : : * called before the device type is known. Consequently these
142 : : * settings can't be overridden via the scsi devinfo mechanism. */
143 [ # # ]: 0 : if (sdev->type == TYPE_DISK) {
144 : :
145 : : /* Some vendors seem to put the READ CAPACITY bug into
146 : : * all their devices -- primarily makers of cell phones
147 : : * and digital cameras. Since these devices always use
148 : : * flash media and can be expected to have an even number
149 : : * of sectors, we will always enable the CAPACITY_HEURISTICS
150 : : * flag unless told otherwise. */
151 [ # # ]: 0 : switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) {
152 : : case VENDOR_ID_NOKIA:
153 : : case VENDOR_ID_NIKON:
154 : : case VENDOR_ID_PENTAX:
155 : : case VENDOR_ID_MOTOROLA:
156 [ # # ]: 0 : if (!(us->fflags & (US_FL_FIX_CAPACITY |
157 : : US_FL_CAPACITY_OK)))
158 : 0 : us->fflags |= US_FL_CAPACITY_HEURISTICS;
159 : : break;
160 : : }
161 : :
162 : : /* Disk-type devices use MODE SENSE(6) if the protocol
163 : : * (SubClass) is Transparent SCSI, otherwise they use
164 : : * MODE SENSE(10). */
165 [ # # ]: 0 : if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB)
166 : 0 : sdev->use_10_for_ms = 1;
167 : :
168 : : /* Many disks only accept MODE SENSE transfer lengths of
169 : : * 192 bytes (that's what Windows uses). */
170 : 0 : sdev->use_192_bytes_for_3f = 1;
171 : :
172 : : /* Some devices don't like MODE SENSE with page=0x3f,
173 : : * which is the command used for checking if a device
174 : : * is write-protected. Now that we tell the sd driver
175 : : * to do a 192-byte transfer with this command the
176 : : * majority of devices work fine, but a few still can't
177 : : * handle it. The sd driver will simply assume those
178 : : * devices are write-enabled. */
179 [ # # ]: 0 : if (us->fflags & US_FL_NO_WP_DETECT)
180 : 0 : sdev->skip_ms_page_3f = 1;
181 : :
182 : : /* A number of devices have problems with MODE SENSE for
183 : : * page x08, so we will skip it. */
184 : 0 : sdev->skip_ms_page_8 = 1;
185 : :
186 : : /* Some devices don't handle VPD pages correctly */
187 : 0 : sdev->skip_vpd_pages = 1;
188 : :
189 : : /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */
190 : 0 : sdev->no_report_opcodes = 1;
191 : :
192 : : /* Do not attempt to use WRITE SAME */
193 : 0 : sdev->no_write_same = 1;
194 : :
195 : : /* Some disks return the total number of blocks in response
196 : : * to READ CAPACITY rather than the highest block number.
197 : : * If this device makes that mistake, tell the sd driver. */
198 [ # # ]: 0 : if (us->fflags & US_FL_FIX_CAPACITY)
199 : 0 : sdev->fix_capacity = 1;
200 : :
201 : : /* A few disks have two indistinguishable version, one of
202 : : * which reports the correct capacity and the other does not.
203 : : * The sd driver has to guess which is the case. */
204 [ # # ]: 0 : if (us->fflags & US_FL_CAPACITY_HEURISTICS)
205 : 0 : sdev->guess_capacity = 1;
206 : :
207 : : /* Some devices cannot handle READ_CAPACITY_16 */
208 [ # # ]: 0 : if (us->fflags & US_FL_NO_READ_CAPACITY_16)
209 : 0 : sdev->no_read_capacity_16 = 1;
210 : :
211 : : /*
212 : : * Many devices do not respond properly to READ_CAPACITY_16.
213 : : * Tell the SCSI layer to try READ_CAPACITY_10 first.
214 : : * However some USB 3.0 drive enclosures return capacity
215 : : * modulo 2TB. Those must use READ_CAPACITY_16
216 : : */
217 [ # # ]: 0 : if (!(us->fflags & US_FL_NEEDS_CAP16))
218 : 0 : sdev->try_rc_10_first = 1;
219 : :
220 : : /* assume SPC3 or latter devices support sense size > 18 */
221 [ # # ]: 0 : if (sdev->scsi_level > SCSI_SPC_2)
222 : 0 : us->fflags |= US_FL_SANE_SENSE;
223 : :
224 : : /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable
225 : : * Hardware Error) when any low-level error occurs,
226 : : * recoverable or not. Setting this flag tells the SCSI
227 : : * midlayer to retry such commands, which frequently will
228 : : * succeed and fix the error. The worst this can lead to
229 : : * is an occasional series of retries that will all fail. */
230 : 0 : sdev->retry_hwerror = 1;
231 : :
232 : : /* USB disks should allow restart. Some drives spin down
233 : : * automatically, requiring a START-STOP UNIT command. */
234 : 0 : sdev->allow_restart = 1;
235 : :
236 : : /* Some USB cardreaders have trouble reading an sdcard's last
237 : : * sector in a larger then 1 sector read, since the performance
238 : : * impact is negible we set this flag for all USB disks */
239 : 0 : sdev->last_sector_bug = 1;
240 : :
241 : : /* Enable last-sector hacks for single-target devices using
242 : : * the Bulk-only transport, unless we already know the
243 : : * capacity will be decremented or is correct. */
244 [ # # ]: 0 : if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK |
245 [ # # ]: 0 : US_FL_SCM_MULT_TARG)) &&
246 : 0 : us->protocol == USB_PR_BULK)
247 : 0 : us->use_last_sector_hacks = 1;
248 : :
249 : : /* Check if write cache default on flag is set or not */
250 [ # # ]: 0 : if (us->fflags & US_FL_WRITE_CACHE)
251 : 0 : sdev->wce_default_on = 1;
252 : :
253 : : } else {
254 : :
255 : : /* Non-disk-type devices don't need to blacklist any pages
256 : : * or to force 192-byte transfer lengths for MODE SENSE.
257 : : * But they do need to use MODE SENSE(10). */
258 : 0 : sdev->use_10_for_ms = 1;
259 : :
260 : : /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */
261 [ # # ]: 0 : if (us->fflags & US_FL_NO_READ_DISC_INFO)
262 : 0 : sdev->no_read_disc_info = 1;
263 : : }
264 : :
265 : : /* The CB and CBI transports have no way to pass LUN values
266 : : * other than the bits in the second byte of a CDB. But those
267 : : * bits don't get set to the LUN value if the device reports
268 : : * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily
269 : : * be single-LUN.
270 : : */
271 [ # # ][ # # ]: 0 : if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
272 : 0 : sdev->scsi_level == SCSI_UNKNOWN)
273 : 0 : us->max_lun = 0;
274 : :
275 : : /* Some devices choke when they receive a PREVENT-ALLOW MEDIUM
276 : : * REMOVAL command, so suppress those commands. */
277 [ # # ]: 0 : if (us->fflags & US_FL_NOT_LOCKABLE)
278 : 0 : sdev->lockable = 0;
279 : :
280 : : /* this is to satisfy the compiler, tho I don't think the
281 : : * return code is ever checked anywhere. */
282 : 0 : return 0;
283 : : }
284 : :
285 : 0 : static int target_alloc(struct scsi_target *starget)
286 : : {
287 : 0 : struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent));
288 : :
289 : : /*
290 : : * Some USB drives don't support REPORT LUNS, even though they
291 : : * report a SCSI revision level above 2. Tell the SCSI layer
292 : : * not to issue that command; it will perform a normal sequential
293 : : * scan instead.
294 : : */
295 : 0 : starget->no_report_luns = 1;
296 : :
297 : : /*
298 : : * The UFI spec treats the Peripheral Qualifier bits in an
299 : : * INQUIRY result as reserved and requires devices to set them
300 : : * to 0. However the SCSI spec requires these bits to be set
301 : : * to 3 to indicate when a LUN is not present.
302 : : *
303 : : * Let the scanning code know if this target merely sets
304 : : * Peripheral Device Type to 0x1f to indicate no LUN.
305 : : */
306 [ # # ]: 0 : if (us->subclass == USB_SC_UFI)
307 : 0 : starget->pdt_1f_for_no_lun = 1;
308 : :
309 : 0 : return 0;
310 : : }
311 : :
312 : : /* queue a command */
313 : : /* This is always called with scsi_lock(host) held */
314 : 0 : static int queuecommand_lck(struct scsi_cmnd *srb,
315 : : void (*done)(struct scsi_cmnd *))
316 : : {
317 : 433719 : struct us_data *us = host_to_us(srb->device->host);
318 : :
319 : : /* check for state-transition errors */
320 [ - + ]: 433719 : if (us->srb != NULL) {
321 : 0 : printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
322 : : __func__, us->srb);
323 : 0 : return SCSI_MLQUEUE_HOST_BUSY;
324 : : }
325 : :
326 : : /* fail the command if we are disconnecting */
327 [ - + ]: 433719 : if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
328 : : usb_stor_dbg(us, "Fail command during disconnect\n");
329 : 0 : srb->result = DID_NO_CONNECT << 16;
330 : 0 : done(srb);
331 : 0 : return 0;
332 : : }
333 : :
334 : : /* enqueue the command and wake up the control thread */
335 : 433719 : srb->scsi_done = done;
336 : 433719 : us->srb = srb;
337 : 433719 : complete(&us->cmnd_ready);
338 : :
339 : 433719 : return 0;
340 : : }
341 : :
342 : 433719 : static DEF_SCSI_QCMD(queuecommand)
343 : :
344 : : /***********************************************************************
345 : : * Error handling functions
346 : : ***********************************************************************/
347 : :
348 : : /* Command timeout and abort */
349 : 0 : static int command_abort(struct scsi_cmnd *srb)
350 : : {
351 : 0 : struct us_data *us = host_to_us(srb->device->host);
352 : :
353 : : usb_stor_dbg(us, "%s called\n", __func__);
354 : :
355 : : /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING
356 : : * bits are protected by the host lock. */
357 : 0 : scsi_lock(us_to_host(us));
358 : :
359 : : /* Is this command still active? */
360 [ # # ]: 0 : if (us->srb != srb) {
361 : 0 : scsi_unlock(us_to_host(us));
362 : : usb_stor_dbg(us, "-- nothing to abort\n");
363 : 0 : return FAILED;
364 : : }
365 : :
366 : : /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
367 : : * a device reset isn't already in progress (to avoid interfering
368 : : * with the reset). Note that we must retain the host lock while
369 : : * calling usb_stor_stop_transport(); otherwise it might interfere
370 : : * with an auto-reset that begins as soon as we release the lock. */
371 : 0 : set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
372 [ # # ]: 0 : if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
373 : 0 : set_bit(US_FLIDX_ABORTING, &us->dflags);
374 : 0 : usb_stor_stop_transport(us);
375 : : }
376 : 0 : scsi_unlock(us_to_host(us));
377 : :
378 : : /* Wait for the aborted command to finish */
379 : 0 : wait_for_completion(&us->notify);
380 : 0 : return SUCCESS;
381 : : }
382 : :
383 : : /* This invokes the transport reset mechanism to reset the state of the
384 : : * device */
385 : 0 : static int device_reset(struct scsi_cmnd *srb)
386 : : {
387 : 0 : struct us_data *us = host_to_us(srb->device->host);
388 : : int result;
389 : :
390 : : usb_stor_dbg(us, "%s called\n", __func__);
391 : :
392 : : /* lock the device pointers and do the reset */
393 : 0 : mutex_lock(&(us->dev_mutex));
394 : 0 : result = us->transport_reset(us);
395 : 0 : mutex_unlock(&us->dev_mutex);
396 : :
397 [ # # ]: 0 : return result < 0 ? FAILED : SUCCESS;
398 : : }
399 : :
400 : : /* Simulate a SCSI bus reset by resetting the device's USB port. */
401 : 0 : static int bus_reset(struct scsi_cmnd *srb)
402 : : {
403 : 0 : struct us_data *us = host_to_us(srb->device->host);
404 : : int result;
405 : :
406 : : usb_stor_dbg(us, "%s called\n", __func__);
407 : :
408 : 0 : result = usb_stor_port_reset(us);
409 [ # # ]: 0 : return result < 0 ? FAILED : SUCCESS;
410 : : }
411 : :
412 : : /* Report a driver-initiated device reset to the SCSI layer.
413 : : * Calling this for a SCSI-initiated reset is unnecessary but harmless.
414 : : * The caller must own the SCSI host lock. */
415 : 0 : void usb_stor_report_device_reset(struct us_data *us)
416 : : {
417 : : int i;
418 : 0 : struct Scsi_Host *host = us_to_host(us);
419 : :
420 : 0 : scsi_report_device_reset(host, 0, 0);
421 [ # # ]: 0 : if (us->fflags & US_FL_SCM_MULT_TARG) {
422 [ # # ]: 0 : for (i = 1; i < host->max_id; ++i)
423 : 0 : scsi_report_device_reset(host, 0, i);
424 : : }
425 : 0 : }
426 : :
427 : : /* Report a driver-initiated bus reset to the SCSI layer.
428 : : * Calling this for a SCSI-initiated reset is unnecessary but harmless.
429 : : * The caller must not own the SCSI host lock. */
430 : 0 : void usb_stor_report_bus_reset(struct us_data *us)
431 : : {
432 : 0 : struct Scsi_Host *host = us_to_host(us);
433 : :
434 : 0 : scsi_lock(host);
435 : 0 : scsi_report_bus_reset(host, 0);
436 : 0 : scsi_unlock(host);
437 : 0 : }
438 : :
439 : : /***********************************************************************
440 : : * /proc/scsi/ functions
441 : : ***********************************************************************/
442 : :
443 : 0 : static int write_info(struct Scsi_Host *host, char *buffer, int length)
444 : : {
445 : : /* if someone is sending us data, just throw it away */
446 : 0 : return length;
447 : : }
448 : :
449 : : /* we use this macro to help us write into the buffer */
450 : : #undef SPRINTF
451 : : #define SPRINTF(args...) seq_printf(m, ## args)
452 : :
453 : 0 : static int show_info (struct seq_file *m, struct Scsi_Host *host)
454 : : {
455 : : struct us_data *us = host_to_us(host);
456 : : const char *string;
457 : :
458 : : /* print the controller name */
459 : 1 : SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
460 : :
461 : : /* print product, vendor, and serial number strings */
462 [ - + ]: 1 : if (us->pusb_dev->manufacturer)
463 : : string = us->pusb_dev->manufacturer;
464 [ # # ]: 0 : else if (us->unusual_dev->vendorName)
465 : : string = us->unusual_dev->vendorName;
466 : : else
467 : : string = "Unknown";
468 : 1 : SPRINTF(" Vendor: %s\n", string);
469 [ - + ]: 1 : if (us->pusb_dev->product)
470 : : string = us->pusb_dev->product;
471 [ # # ]: 0 : else if (us->unusual_dev->productName)
472 : : string = us->unusual_dev->productName;
473 : : else
474 : : string = "Unknown";
475 : 1 : SPRINTF(" Product: %s\n", string);
476 [ + - ]: 1 : if (us->pusb_dev->serial)
477 : : string = us->pusb_dev->serial;
478 : : else
479 : : string = "None";
480 : 1 : SPRINTF("Serial Number: %s\n", string);
481 : :
482 : : /* show the protocol and transport */
483 : 1 : SPRINTF(" Protocol: %s\n", us->protocol_name);
484 : 1 : SPRINTF(" Transport: %s\n", us->transport_name);
485 : :
486 : : /* show the device flags */
487 : 1 : SPRINTF(" Quirks:");
488 : :
489 : : #define US_FLAG(name, value) \
490 : : if (us->fflags & value) seq_printf(m, " " #name);
491 [ - + ][ - + ]: 1 : US_DO_ALL_FLAGS
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ]
492 : : #undef US_FLAG
493 : 1 : seq_putc(m, '\n');
494 : 1 : return 0;
495 : : }
496 : :
497 : : /***********************************************************************
498 : : * Sysfs interface
499 : : ***********************************************************************/
500 : :
501 : : /* Output routine for the sysfs max_sectors file */
502 : 0 : static ssize_t max_sectors_show(struct device *dev, struct device_attribute *attr, char *buf)
503 : : {
504 : : struct scsi_device *sdev = to_scsi_device(dev);
505 : :
506 : 0 : return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue));
507 : : }
508 : :
509 : : /* Input routine for the sysfs max_sectors file */
510 : 0 : static ssize_t max_sectors_store(struct device *dev, struct device_attribute *attr, const char *buf,
511 : : size_t count)
512 : : {
513 : : struct scsi_device *sdev = to_scsi_device(dev);
514 : : unsigned short ms;
515 : :
516 [ # # ]: 0 : if (sscanf(buf, "%hu", &ms) > 0) {
517 : 0 : blk_queue_max_hw_sectors(sdev->request_queue, ms);
518 : 0 : return count;
519 : : }
520 : : return -EINVAL;
521 : : }
522 : : static DEVICE_ATTR_RW(max_sectors);
523 : :
524 : : static struct device_attribute *sysfs_device_attr_list[] = {
525 : : &dev_attr_max_sectors,
526 : : NULL,
527 : : };
528 : :
529 : : /*
530 : : * this defines our host template, with which we'll allocate hosts
531 : : */
532 : :
533 : : struct scsi_host_template usb_stor_host_template = {
534 : : /* basic userland interface stuff */
535 : : .name = "usb-storage",
536 : : .proc_name = "usb-storage",
537 : : .show_info = show_info,
538 : : .write_info = write_info,
539 : : .info = host_info,
540 : :
541 : : /* command interface -- queued only */
542 : : .queuecommand = queuecommand,
543 : :
544 : : /* error and abort handlers */
545 : : .eh_abort_handler = command_abort,
546 : : .eh_device_reset_handler = device_reset,
547 : : .eh_bus_reset_handler = bus_reset,
548 : :
549 : : /* queue commands only, only one command per LUN */
550 : : .can_queue = 1,
551 : : .cmd_per_lun = 1,
552 : :
553 : : /* unknown initiator id */
554 : : .this_id = -1,
555 : :
556 : : .slave_alloc = slave_alloc,
557 : : .slave_configure = slave_configure,
558 : : .target_alloc = target_alloc,
559 : :
560 : : /* lots of sg segments can be handled */
561 : : .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
562 : :
563 : : /* limit the total size of a transfer to 120 KB */
564 : : .max_sectors = 240,
565 : :
566 : : /* merge commands... this seems to help performance, but
567 : : * periodically someone should test to see which setting is more
568 : : * optimal.
569 : : */
570 : : .use_clustering = 1,
571 : :
572 : : /* emulated HBA */
573 : : .emulated = 1,
574 : :
575 : : /* we do our own delay after a device or bus reset */
576 : : .skip_settle_delay = 1,
577 : :
578 : : /* sysfs device attributes */
579 : : .sdev_attrs = sysfs_device_attr_list,
580 : :
581 : : /* module management */
582 : : .module = THIS_MODULE
583 : : };
584 : :
585 : : /* To Report "Illegal Request: Invalid Field in CDB */
586 : : unsigned char usb_stor_sense_invalidCDB[18] = {
587 : : [0] = 0x70, /* current error */
588 : : [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
589 : : [7] = 0x0a, /* additional length */
590 : : [12] = 0x24 /* Invalid Field in CDB */
591 : : };
592 : : EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB);
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