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1 | /* Driver for USB Mass Storage compliant devices | |
2 | * | |
3 | * Current development and maintenance by: | |
4 | * (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
5 | * | |
6 | * Developed with the assistance of: | |
7 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
8 | * (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu) | |
9 | * | |
10 | * Initial work by: | |
11 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
12 | * | |
13 | * usb_device_id support by Adam J. Richter (adam@yggdrasil.com): | |
14 | * (c) 2000 Yggdrasil Computing, Inc. | |
15 | * | |
16 | * This driver is based on the 'USB Mass Storage Class' document. This | |
17 | * describes in detail the protocol used to communicate with such | |
18 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
19 | * mind when they created this document. The commands are all very | |
20 | * similar to commands in the SCSI-II and ATAPI specifications. | |
21 | * | |
22 | * It is important to note that in a number of cases this class | |
23 | * exhibits class-specific exemptions from the USB specification. | |
24 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
25 | * that they are used to communicate wait, failed and OK on commands. | |
26 | * | |
27 | * Also, for certain devices, the interrupt endpoint is used to convey | |
28 | * status of a command. | |
29 | * | |
30 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
31 | * information about this driver. | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or modify it | |
34 | * under the terms of the GNU General Public License as published by the | |
35 | * Free Software Foundation; either version 2, or (at your option) any | |
36 | * later version. | |
37 | * | |
38 | * This program is distributed in the hope that it will be useful, but | |
39 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41 | * General Public License for more details. | |
42 | * | |
43 | * You should have received a copy of the GNU General Public License along | |
44 | * with this program; if not, write to the Free Software Foundation, Inc., | |
45 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
46 | */ | |
47 | ||
48 | #ifdef CONFIG_USB_STORAGE_DEBUG | |
49 | #define DEBUG | |
50 | #endif | |
51 | ||
52 | #include <linux/sched.h> | |
53 | #include <linux/errno.h> | |
54 | #include <linux/freezer.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/init.h> | |
57 | #include <linux/slab.h> | |
58 | #include <linux/kthread.h> | |
59 | #include <linux/mutex.h> | |
60 | #include <linux/utsname.h> | |
61 | ||
62 | #include <scsi/scsi.h> | |
63 | #include <scsi/scsi_cmnd.h> | |
64 | #include <scsi/scsi_device.h> | |
65 | ||
66 | #include "usb.h" | |
67 | #include "scsiglue.h" | |
68 | #include "transport.h" | |
69 | #include "protocol.h" | |
70 | #include "debug.h" | |
71 | #include "initializers.h" | |
72 | ||
73 | #include "sierra_ms.h" | |
74 | #include "option_ms.h" | |
75 | ||
76 | /* Some informational data */ | |
77 | MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>"); | |
78 | MODULE_DESCRIPTION("USB Mass Storage driver for Linux"); | |
79 | MODULE_LICENSE("GPL"); | |
80 | ||
81 | static unsigned int delay_use = 1; | |
82 | module_param(delay_use, uint, S_IRUGO | S_IWUSR); | |
83 | MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device"); | |
84 | ||
85 | static char quirks[128]; | |
86 | module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR); | |
87 | MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks"); | |
88 | ||
89 | ||
90 | /* | |
91 | * The entries in this table correspond, line for line, | |
92 | * with the entries in usb_storage_usb_ids[], defined in usual-tables.c. | |
93 | */ | |
94 | ||
95 | /* The vendor name should be kept at eight characters or less, and | |
96 | * the product name should be kept at 16 characters or less. If a device | |
97 | * has the US_FL_FIX_INQUIRY flag, then the vendor and product names | |
98 | * normally generated by a device thorugh the INQUIRY response will be | |
99 | * taken from this list, and this is the reason for the above size | |
100 | * restriction. However, if the flag is not present, then you | |
101 | * are free to use as many characters as you like. | |
102 | */ | |
103 | ||
104 | #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ | |
105 | vendor_name, product_name, use_protocol, use_transport, \ | |
106 | init_function, Flags) \ | |
107 | { \ | |
108 | .vendorName = vendor_name, \ | |
109 | .productName = product_name, \ | |
110 | .useProtocol = use_protocol, \ | |
111 | .useTransport = use_transport, \ | |
112 | .initFunction = init_function, \ | |
113 | } | |
114 | ||
115 | #define COMPLIANT_DEV UNUSUAL_DEV | |
116 | ||
117 | #define USUAL_DEV(use_protocol, use_transport, use_type) \ | |
118 | { \ | |
119 | .useProtocol = use_protocol, \ | |
120 | .useTransport = use_transport, \ | |
121 | } | |
122 | ||
123 | static struct us_unusual_dev us_unusual_dev_list[] = { | |
124 | # include "unusual_devs.h" | |
125 | { } /* Terminating entry */ | |
126 | }; | |
127 | ||
128 | static struct us_unusual_dev for_dynamic_ids = | |
129 | USUAL_DEV(USB_SC_SCSI, USB_PR_BULK, 0); | |
130 | ||
131 | #undef UNUSUAL_DEV | |
132 | #undef COMPLIANT_DEV | |
133 | #undef USUAL_DEV | |
134 | ||
135 | #ifdef CONFIG_LOCKDEP | |
136 | ||
137 | static struct lock_class_key us_interface_key[USB_MAXINTERFACES]; | |
138 | ||
139 | static void us_set_lock_class(struct mutex *mutex, | |
140 | struct usb_interface *intf) | |
141 | { | |
142 | struct usb_device *udev = interface_to_usbdev(intf); | |
143 | struct usb_host_config *config = udev->actconfig; | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
147 | if (config->interface[i] == intf) | |
148 | break; | |
149 | } | |
150 | ||
151 | BUG_ON(i == config->desc.bNumInterfaces); | |
152 | ||
153 | lockdep_set_class(mutex, &us_interface_key[i]); | |
154 | } | |
155 | ||
156 | #else | |
157 | ||
158 | static void us_set_lock_class(struct mutex *mutex, | |
159 | struct usb_interface *intf) | |
160 | { | |
161 | } | |
162 | ||
163 | #endif | |
164 | ||
165 | #ifdef CONFIG_PM /* Minimal support for suspend and resume */ | |
166 | ||
167 | int usb_stor_suspend(struct usb_interface *iface, pm_message_t message) | |
168 | { | |
169 | struct us_data *us = usb_get_intfdata(iface); | |
170 | ||
171 | /* Wait until no command is running */ | |
172 | mutex_lock(&us->dev_mutex); | |
173 | ||
174 | US_DEBUGP("%s\n", __func__); | |
175 | if (us->suspend_resume_hook) | |
176 | (us->suspend_resume_hook)(us, US_SUSPEND); | |
177 | ||
178 | /* When runtime PM is working, we'll set a flag to indicate | |
179 | * whether we should autoresume when a SCSI request arrives. */ | |
180 | ||
181 | mutex_unlock(&us->dev_mutex); | |
182 | return 0; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(usb_stor_suspend); | |
185 | ||
186 | int usb_stor_resume(struct usb_interface *iface) | |
187 | { | |
188 | struct us_data *us = usb_get_intfdata(iface); | |
189 | ||
190 | mutex_lock(&us->dev_mutex); | |
191 | ||
192 | US_DEBUGP("%s\n", __func__); | |
193 | if (us->suspend_resume_hook) | |
194 | (us->suspend_resume_hook)(us, US_RESUME); | |
195 | ||
196 | mutex_unlock(&us->dev_mutex); | |
197 | return 0; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(usb_stor_resume); | |
200 | ||
201 | int usb_stor_reset_resume(struct usb_interface *iface) | |
202 | { | |
203 | struct us_data *us = usb_get_intfdata(iface); | |
204 | ||
205 | US_DEBUGP("%s\n", __func__); | |
206 | ||
207 | /* Report the reset to the SCSI core */ | |
208 | usb_stor_report_bus_reset(us); | |
209 | ||
210 | /* FIXME: Notify the subdrivers that they need to reinitialize | |
211 | * the device */ | |
212 | return 0; | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(usb_stor_reset_resume); | |
215 | ||
216 | #endif /* CONFIG_PM */ | |
217 | ||
218 | /* | |
219 | * The next two routines get called just before and just after | |
220 | * a USB port reset, whether from this driver or a different one. | |
221 | */ | |
222 | ||
223 | int usb_stor_pre_reset(struct usb_interface *iface) | |
224 | { | |
225 | struct us_data *us = usb_get_intfdata(iface); | |
226 | ||
227 | US_DEBUGP("%s\n", __func__); | |
228 | ||
229 | /* Make sure no command runs during the reset */ | |
230 | mutex_lock(&us->dev_mutex); | |
231 | return 0; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(usb_stor_pre_reset); | |
234 | ||
235 | int usb_stor_post_reset(struct usb_interface *iface) | |
236 | { | |
237 | struct us_data *us = usb_get_intfdata(iface); | |
238 | ||
239 | US_DEBUGP("%s\n", __func__); | |
240 | ||
241 | /* Report the reset to the SCSI core */ | |
242 | usb_stor_report_bus_reset(us); | |
243 | ||
244 | /* FIXME: Notify the subdrivers that they need to reinitialize | |
245 | * the device */ | |
246 | ||
247 | mutex_unlock(&us->dev_mutex); | |
248 | return 0; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(usb_stor_post_reset); | |
251 | ||
252 | /* | |
253 | * fill_inquiry_response takes an unsigned char array (which must | |
254 | * be at least 36 characters) and populates the vendor name, | |
255 | * product name, and revision fields. Then the array is copied | |
256 | * into the SCSI command's response buffer (oddly enough | |
257 | * called request_buffer). data_len contains the length of the | |
258 | * data array, which again must be at least 36. | |
259 | */ | |
260 | ||
261 | void fill_inquiry_response(struct us_data *us, unsigned char *data, | |
262 | unsigned int data_len) | |
263 | { | |
264 | if (data_len < 36) /* You lose. */ | |
265 | return; | |
266 | ||
267 | memset(data+8, ' ', 28); | |
268 | if(data[0]&0x20) { /* USB device currently not connected. Return | |
269 | peripheral qualifier 001b ("...however, the | |
270 | physical device is not currently connected | |
271 | to this logical unit") and leave vendor and | |
272 | product identification empty. ("If the target | |
273 | does store some of the INQUIRY data on the | |
274 | device, it may return zeros or ASCII spaces | |
275 | (20h) in those fields until the data is | |
276 | available from the device."). */ | |
277 | } else { | |
278 | u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice); | |
279 | int n; | |
280 | ||
281 | n = strlen(us->unusual_dev->vendorName); | |
282 | memcpy(data+8, us->unusual_dev->vendorName, min(8, n)); | |
283 | n = strlen(us->unusual_dev->productName); | |
284 | memcpy(data+16, us->unusual_dev->productName, min(16, n)); | |
285 | ||
286 | data[32] = 0x30 + ((bcdDevice>>12) & 0x0F); | |
287 | data[33] = 0x30 + ((bcdDevice>>8) & 0x0F); | |
288 | data[34] = 0x30 + ((bcdDevice>>4) & 0x0F); | |
289 | data[35] = 0x30 + ((bcdDevice) & 0x0F); | |
290 | } | |
291 | ||
292 | usb_stor_set_xfer_buf(data, data_len, us->srb); | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(fill_inquiry_response); | |
295 | ||
296 | static int usb_stor_control_thread(void * __us) | |
297 | { | |
298 | struct us_data *us = (struct us_data *)__us; | |
299 | struct Scsi_Host *host = us_to_host(us); | |
300 | ||
301 | for(;;) { | |
302 | US_DEBUGP("*** thread sleeping.\n"); | |
303 | if (wait_for_completion_interruptible(&us->cmnd_ready)) | |
304 | break; | |
305 | ||
306 | US_DEBUGP("*** thread awakened.\n"); | |
307 | ||
308 | /* lock the device pointers */ | |
309 | mutex_lock(&(us->dev_mutex)); | |
310 | ||
311 | /* lock access to the state */ | |
312 | scsi_lock(host); | |
313 | ||
314 | /* When we are called with no command pending, we're done */ | |
315 | if (us->srb == NULL) { | |
316 | scsi_unlock(host); | |
317 | mutex_unlock(&us->dev_mutex); | |
318 | US_DEBUGP("-- exiting\n"); | |
319 | break; | |
320 | } | |
321 | ||
322 | /* has the command timed out *already* ? */ | |
323 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { | |
324 | us->srb->result = DID_ABORT << 16; | |
325 | goto SkipForAbort; | |
326 | } | |
327 | ||
328 | scsi_unlock(host); | |
329 | ||
330 | /* reject the command if the direction indicator | |
331 | * is UNKNOWN | |
332 | */ | |
333 | if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) { | |
334 | US_DEBUGP("UNKNOWN data direction\n"); | |
335 | us->srb->result = DID_ERROR << 16; | |
336 | } | |
337 | ||
338 | /* reject if target != 0 or if LUN is higher than | |
339 | * the maximum known LUN | |
340 | */ | |
341 | else if (us->srb->device->id && | |
342 | !(us->fflags & US_FL_SCM_MULT_TARG)) { | |
343 | US_DEBUGP("Bad target number (%d:%d)\n", | |
344 | us->srb->device->id, us->srb->device->lun); | |
345 | us->srb->result = DID_BAD_TARGET << 16; | |
346 | } | |
347 | ||
348 | else if (us->srb->device->lun > us->max_lun) { | |
349 | US_DEBUGP("Bad LUN (%d:%d)\n", | |
350 | us->srb->device->id, us->srb->device->lun); | |
351 | us->srb->result = DID_BAD_TARGET << 16; | |
352 | } | |
353 | ||
354 | /* Handle those devices which need us to fake | |
355 | * their inquiry data */ | |
356 | else if ((us->srb->cmnd[0] == INQUIRY) && | |
357 | (us->fflags & US_FL_FIX_INQUIRY)) { | |
358 | unsigned char data_ptr[36] = { | |
359 | 0x00, 0x80, 0x02, 0x02, | |
360 | 0x1F, 0x00, 0x00, 0x00}; | |
361 | ||
362 | US_DEBUGP("Faking INQUIRY command\n"); | |
363 | fill_inquiry_response(us, data_ptr, 36); | |
364 | us->srb->result = SAM_STAT_GOOD; | |
365 | } | |
366 | ||
367 | /* we've got a command, let's do it! */ | |
368 | else { | |
369 | US_DEBUG(usb_stor_show_command(us->srb)); | |
370 | us->proto_handler(us->srb, us); | |
371 | usb_mark_last_busy(us->pusb_dev); | |
372 | } | |
373 | ||
374 | /* lock access to the state */ | |
375 | scsi_lock(host); | |
376 | ||
377 | /* indicate that the command is done */ | |
378 | if (us->srb->result != DID_ABORT << 16) { | |
379 | US_DEBUGP("scsi cmd done, result=0x%x\n", | |
380 | us->srb->result); | |
381 | us->srb->scsi_done(us->srb); | |
382 | } else { | |
383 | SkipForAbort: | |
384 | US_DEBUGP("scsi command aborted\n"); | |
385 | } | |
386 | ||
387 | /* If an abort request was received we need to signal that | |
388 | * the abort has finished. The proper test for this is | |
389 | * the TIMED_OUT flag, not srb->result == DID_ABORT, because | |
390 | * the timeout might have occurred after the command had | |
391 | * already completed with a different result code. */ | |
392 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { | |
393 | complete(&(us->notify)); | |
394 | ||
395 | /* Allow USB transfers to resume */ | |
396 | clear_bit(US_FLIDX_ABORTING, &us->dflags); | |
397 | clear_bit(US_FLIDX_TIMED_OUT, &us->dflags); | |
398 | } | |
399 | ||
400 | /* finished working on this command */ | |
401 | us->srb = NULL; | |
402 | scsi_unlock(host); | |
403 | ||
404 | /* unlock the device pointers */ | |
405 | mutex_unlock(&us->dev_mutex); | |
406 | } /* for (;;) */ | |
407 | ||
408 | /* Wait until we are told to stop */ | |
409 | for (;;) { | |
410 | set_current_state(TASK_INTERRUPTIBLE); | |
411 | if (kthread_should_stop()) | |
412 | break; | |
413 | schedule(); | |
414 | } | |
415 | __set_current_state(TASK_RUNNING); | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /*********************************************************************** | |
420 | * Device probing and disconnecting | |
421 | ***********************************************************************/ | |
422 | ||
423 | /* Associate our private data with the USB device */ | |
424 | static int associate_dev(struct us_data *us, struct usb_interface *intf) | |
425 | { | |
426 | US_DEBUGP("-- %s\n", __func__); | |
427 | ||
428 | /* Fill in the device-related fields */ | |
429 | us->pusb_dev = interface_to_usbdev(intf); | |
430 | us->pusb_intf = intf; | |
431 | us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
432 | US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n", | |
433 | le16_to_cpu(us->pusb_dev->descriptor.idVendor), | |
434 | le16_to_cpu(us->pusb_dev->descriptor.idProduct), | |
435 | le16_to_cpu(us->pusb_dev->descriptor.bcdDevice)); | |
436 | US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n", | |
437 | intf->cur_altsetting->desc.bInterfaceSubClass, | |
438 | intf->cur_altsetting->desc.bInterfaceProtocol); | |
439 | ||
440 | /* Store our private data in the interface */ | |
441 | usb_set_intfdata(intf, us); | |
442 | ||
443 | /* Allocate the control/setup and DMA-mapped buffers */ | |
444 | us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL); | |
445 | if (!us->cr) { | |
446 | US_DEBUGP("usb_ctrlrequest allocation failed\n"); | |
447 | return -ENOMEM; | |
448 | } | |
449 | ||
450 | us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE, | |
451 | GFP_KERNEL, &us->iobuf_dma); | |
452 | if (!us->iobuf) { | |
453 | US_DEBUGP("I/O buffer allocation failed\n"); | |
454 | return -ENOMEM; | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
459 | /* Works only for digits and letters, but small and fast */ | |
460 | #define TOLOWER(x) ((x) | 0x20) | |
461 | ||
462 | /* Adjust device flags based on the "quirks=" module parameter */ | |
463 | static void adjust_quirks(struct us_data *us) | |
464 | { | |
465 | char *p; | |
466 | u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor); | |
467 | u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct); | |
468 | unsigned f = 0; | |
469 | unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE | | |
470 | US_FL_FIX_CAPACITY | | |
471 | US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE | | |
472 | US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 | | |
473 | US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE | | |
474 | US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT | | |
475 | US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 | | |
476 | US_FL_INITIAL_READ10); | |
477 | ||
478 | p = quirks; | |
479 | while (*p) { | |
480 | /* Each entry consists of VID:PID:flags */ | |
481 | if (vid == simple_strtoul(p, &p, 16) && | |
482 | *p == ':' && | |
483 | pid == simple_strtoul(p+1, &p, 16) && | |
484 | *p == ':') | |
485 | break; | |
486 | ||
487 | /* Move forward to the next entry */ | |
488 | while (*p) { | |
489 | if (*p++ == ',') | |
490 | break; | |
491 | } | |
492 | } | |
493 | if (!*p) /* No match */ | |
494 | return; | |
495 | ||
496 | /* Collect the flags */ | |
497 | while (*++p && *p != ',') { | |
498 | switch (TOLOWER(*p)) { | |
499 | case 'a': | |
500 | f |= US_FL_SANE_SENSE; | |
501 | break; | |
502 | case 'b': | |
503 | f |= US_FL_BAD_SENSE; | |
504 | break; | |
505 | case 'c': | |
506 | f |= US_FL_FIX_CAPACITY; | |
507 | break; | |
508 | case 'd': | |
509 | f |= US_FL_NO_READ_DISC_INFO; | |
510 | break; | |
511 | case 'e': | |
512 | f |= US_FL_NO_READ_CAPACITY_16; | |
513 | break; | |
514 | case 'h': | |
515 | f |= US_FL_CAPACITY_HEURISTICS; | |
516 | break; | |
517 | case 'i': | |
518 | f |= US_FL_IGNORE_DEVICE; | |
519 | break; | |
520 | case 'l': | |
521 | f |= US_FL_NOT_LOCKABLE; | |
522 | break; | |
523 | case 'm': | |
524 | f |= US_FL_MAX_SECTORS_64; | |
525 | break; | |
526 | case 'n': | |
527 | f |= US_FL_INITIAL_READ10; | |
528 | break; | |
529 | case 'o': | |
530 | f |= US_FL_CAPACITY_OK; | |
531 | break; | |
532 | case 'r': | |
533 | f |= US_FL_IGNORE_RESIDUE; | |
534 | break; | |
535 | case 's': | |
536 | f |= US_FL_SINGLE_LUN; | |
537 | break; | |
538 | case 'w': | |
539 | f |= US_FL_NO_WP_DETECT; | |
540 | break; | |
541 | /* Ignore unrecognized flag characters */ | |
542 | } | |
543 | } | |
544 | us->fflags = (us->fflags & ~mask) | f; | |
545 | } | |
546 | ||
547 | /* Get the unusual_devs entries and the string descriptors */ | |
548 | static int get_device_info(struct us_data *us, const struct usb_device_id *id, | |
549 | struct us_unusual_dev *unusual_dev) | |
550 | { | |
551 | struct usb_device *dev = us->pusb_dev; | |
552 | struct usb_interface_descriptor *idesc = | |
553 | &us->pusb_intf->cur_altsetting->desc; | |
554 | struct device *pdev = &us->pusb_intf->dev; | |
555 | ||
556 | /* Store the entries */ | |
557 | us->unusual_dev = unusual_dev; | |
558 | us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ? | |
559 | idesc->bInterfaceSubClass : | |
560 | unusual_dev->useProtocol; | |
561 | us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ? | |
562 | idesc->bInterfaceProtocol : | |
563 | unusual_dev->useTransport; | |
564 | us->fflags = USB_US_ORIG_FLAGS(id->driver_info); | |
565 | adjust_quirks(us); | |
566 | ||
567 | if (us->fflags & US_FL_IGNORE_DEVICE) { | |
568 | dev_info(pdev, "device ignored\n"); | |
569 | return -ENODEV; | |
570 | } | |
571 | ||
572 | /* | |
573 | * This flag is only needed when we're in high-speed, so let's | |
574 | * disable it if we're in full-speed | |
575 | */ | |
576 | if (dev->speed != USB_SPEED_HIGH) | |
577 | us->fflags &= ~US_FL_GO_SLOW; | |
578 | ||
579 | if (us->fflags) | |
580 | dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n", | |
581 | le16_to_cpu(dev->descriptor.idVendor), | |
582 | le16_to_cpu(dev->descriptor.idProduct), | |
583 | us->fflags); | |
584 | ||
585 | /* Log a message if a non-generic unusual_dev entry contains an | |
586 | * unnecessary subclass or protocol override. This may stimulate | |
587 | * reports from users that will help us remove unneeded entries | |
588 | * from the unusual_devs.h table. | |
589 | */ | |
590 | if (id->idVendor || id->idProduct) { | |
591 | static const char *msgs[3] = { | |
592 | "an unneeded SubClass entry", | |
593 | "an unneeded Protocol entry", | |
594 | "unneeded SubClass and Protocol entries"}; | |
595 | struct usb_device_descriptor *ddesc = &dev->descriptor; | |
596 | int msg = -1; | |
597 | ||
598 | if (unusual_dev->useProtocol != USB_SC_DEVICE && | |
599 | us->subclass == idesc->bInterfaceSubClass) | |
600 | msg += 1; | |
601 | if (unusual_dev->useTransport != USB_PR_DEVICE && | |
602 | us->protocol == idesc->bInterfaceProtocol) | |
603 | msg += 2; | |
604 | if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE)) | |
605 | dev_notice(pdev, "This device " | |
606 | "(%04x,%04x,%04x S %02x P %02x)" | |
607 | " has %s in unusual_devs.h (kernel" | |
608 | " %s)\n" | |
609 | " Please send a copy of this message to " | |
610 | "<linux-usb@vger.kernel.org> and " | |
611 | "<usb-storage@lists.one-eyed-alien.net>\n", | |
612 | le16_to_cpu(ddesc->idVendor), | |
613 | le16_to_cpu(ddesc->idProduct), | |
614 | le16_to_cpu(ddesc->bcdDevice), | |
615 | idesc->bInterfaceSubClass, | |
616 | idesc->bInterfaceProtocol, | |
617 | msgs[msg], | |
618 | utsname()->release); | |
619 | } | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | /* Get the transport settings */ | |
625 | static void get_transport(struct us_data *us) | |
626 | { | |
627 | switch (us->protocol) { | |
628 | case USB_PR_CB: | |
629 | us->transport_name = "Control/Bulk"; | |
630 | us->transport = usb_stor_CB_transport; | |
631 | us->transport_reset = usb_stor_CB_reset; | |
632 | us->max_lun = 7; | |
633 | break; | |
634 | ||
635 | case USB_PR_CBI: | |
636 | us->transport_name = "Control/Bulk/Interrupt"; | |
637 | us->transport = usb_stor_CB_transport; | |
638 | us->transport_reset = usb_stor_CB_reset; | |
639 | us->max_lun = 7; | |
640 | break; | |
641 | ||
642 | case USB_PR_BULK: | |
643 | us->transport_name = "Bulk"; | |
644 | us->transport = usb_stor_Bulk_transport; | |
645 | us->transport_reset = usb_stor_Bulk_reset; | |
646 | break; | |
647 | } | |
648 | } | |
649 | ||
650 | /* Get the protocol settings */ | |
651 | static void get_protocol(struct us_data *us) | |
652 | { | |
653 | switch (us->subclass) { | |
654 | case USB_SC_RBC: | |
655 | us->protocol_name = "Reduced Block Commands (RBC)"; | |
656 | us->proto_handler = usb_stor_transparent_scsi_command; | |
657 | break; | |
658 | ||
659 | case USB_SC_8020: | |
660 | us->protocol_name = "8020i"; | |
661 | us->proto_handler = usb_stor_pad12_command; | |
662 | us->max_lun = 0; | |
663 | break; | |
664 | ||
665 | case USB_SC_QIC: | |
666 | us->protocol_name = "QIC-157"; | |
667 | us->proto_handler = usb_stor_pad12_command; | |
668 | us->max_lun = 0; | |
669 | break; | |
670 | ||
671 | case USB_SC_8070: | |
672 | us->protocol_name = "8070i"; | |
673 | us->proto_handler = usb_stor_pad12_command; | |
674 | us->max_lun = 0; | |
675 | break; | |
676 | ||
677 | case USB_SC_SCSI: | |
678 | us->protocol_name = "Transparent SCSI"; | |
679 | us->proto_handler = usb_stor_transparent_scsi_command; | |
680 | break; | |
681 | ||
682 | case USB_SC_UFI: | |
683 | us->protocol_name = "Uniform Floppy Interface (UFI)"; | |
684 | us->proto_handler = usb_stor_ufi_command; | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | /* Get the pipe settings */ | |
690 | static int get_pipes(struct us_data *us) | |
691 | { | |
692 | struct usb_host_interface *altsetting = | |
693 | us->pusb_intf->cur_altsetting; | |
694 | int i; | |
695 | struct usb_endpoint_descriptor *ep; | |
696 | struct usb_endpoint_descriptor *ep_in = NULL; | |
697 | struct usb_endpoint_descriptor *ep_out = NULL; | |
698 | struct usb_endpoint_descriptor *ep_int = NULL; | |
699 | ||
700 | /* | |
701 | * Find the first endpoint of each type we need. | |
702 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
703 | * An optional interrupt-in is OK (necessary for CBI protocol). | |
704 | * We will ignore any others. | |
705 | */ | |
706 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
707 | ep = &altsetting->endpoint[i].desc; | |
708 | ||
709 | if (usb_endpoint_xfer_bulk(ep)) { | |
710 | if (usb_endpoint_dir_in(ep)) { | |
711 | if (!ep_in) | |
712 | ep_in = ep; | |
713 | } else { | |
714 | if (!ep_out) | |
715 | ep_out = ep; | |
716 | } | |
717 | } | |
718 | ||
719 | else if (usb_endpoint_is_int_in(ep)) { | |
720 | if (!ep_int) | |
721 | ep_int = ep; | |
722 | } | |
723 | } | |
724 | ||
725 | if (!ep_in || !ep_out || (us->protocol == USB_PR_CBI && !ep_int)) { | |
726 | US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n"); | |
727 | return -EIO; | |
728 | } | |
729 | ||
730 | /* Calculate and store the pipe values */ | |
731 | us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0); | |
732 | us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0); | |
733 | us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, | |
734 | usb_endpoint_num(ep_out)); | |
735 | us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, | |
736 | usb_endpoint_num(ep_in)); | |
737 | if (ep_int) { | |
738 | us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, | |
739 | usb_endpoint_num(ep_int)); | |
740 | us->ep_bInterval = ep_int->bInterval; | |
741 | } | |
742 | return 0; | |
743 | } | |
744 | ||
745 | /* Initialize all the dynamic resources we need */ | |
746 | static int usb_stor_acquire_resources(struct us_data *us) | |
747 | { | |
748 | int p; | |
749 | struct task_struct *th; | |
750 | ||
751 | us->current_urb = usb_alloc_urb(0, GFP_KERNEL); | |
752 | if (!us->current_urb) { | |
753 | US_DEBUGP("URB allocation failed\n"); | |
754 | return -ENOMEM; | |
755 | } | |
756 | ||
757 | /* Just before we start our control thread, initialize | |
758 | * the device if it needs initialization */ | |
759 | if (us->unusual_dev->initFunction) { | |
760 | p = us->unusual_dev->initFunction(us); | |
761 | if (p) | |
762 | return p; | |
763 | } | |
764 | ||
765 | /* Start up our control thread */ | |
766 | th = kthread_run(usb_stor_control_thread, us, "usb-storage"); | |
767 | if (IS_ERR(th)) { | |
768 | dev_warn(&us->pusb_intf->dev, | |
769 | "Unable to start control thread\n"); | |
770 | return PTR_ERR(th); | |
771 | } | |
772 | us->ctl_thread = th; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | /* Release all our dynamic resources */ | |
778 | static void usb_stor_release_resources(struct us_data *us) | |
779 | { | |
780 | US_DEBUGP("-- %s\n", __func__); | |
781 | ||
782 | /* Tell the control thread to exit. The SCSI host must | |
783 | * already have been removed and the DISCONNECTING flag set | |
784 | * so that we won't accept any more commands. | |
785 | */ | |
786 | US_DEBUGP("-- sending exit command to thread\n"); | |
787 | complete(&us->cmnd_ready); | |
788 | if (us->ctl_thread) | |
789 | kthread_stop(us->ctl_thread); | |
790 | ||
791 | /* Call the destructor routine, if it exists */ | |
792 | if (us->extra_destructor) { | |
793 | US_DEBUGP("-- calling extra_destructor()\n"); | |
794 | us->extra_destructor(us->extra); | |
795 | } | |
796 | ||
797 | /* Free the extra data and the URB */ | |
798 | kfree(us->extra); | |
799 | usb_free_urb(us->current_urb); | |
800 | } | |
801 | ||
802 | /* Dissociate from the USB device */ | |
803 | static void dissociate_dev(struct us_data *us) | |
804 | { | |
805 | US_DEBUGP("-- %s\n", __func__); | |
806 | ||
807 | /* Free the buffers */ | |
808 | kfree(us->cr); | |
809 | usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma); | |
810 | ||
811 | /* Remove our private data from the interface */ | |
812 | usb_set_intfdata(us->pusb_intf, NULL); | |
813 | } | |
814 | ||
815 | /* First stage of disconnect processing: stop SCSI scanning, | |
816 | * remove the host, and stop accepting new commands | |
817 | */ | |
818 | static void quiesce_and_remove_host(struct us_data *us) | |
819 | { | |
820 | struct Scsi_Host *host = us_to_host(us); | |
821 | ||
822 | /* If the device is really gone, cut short reset delays */ | |
823 | if (us->pusb_dev->state == USB_STATE_NOTATTACHED) { | |
824 | set_bit(US_FLIDX_DISCONNECTING, &us->dflags); | |
825 | wake_up(&us->delay_wait); | |
826 | } | |
827 | ||
828 | /* Prevent SCSI scanning (if it hasn't started yet) | |
829 | * or wait for the SCSI-scanning routine to stop. | |
830 | */ | |
831 | cancel_delayed_work_sync(&us->scan_dwork); | |
832 | ||
833 | /* Balance autopm calls if scanning was cancelled */ | |
834 | if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags)) | |
835 | usb_autopm_put_interface_no_suspend(us->pusb_intf); | |
836 | ||
837 | /* Removing the host will perform an orderly shutdown: caches | |
838 | * synchronized, disks spun down, etc. | |
839 | */ | |
840 | scsi_remove_host(host); | |
841 | ||
842 | /* Prevent any new commands from being accepted and cut short | |
843 | * reset delays. | |
844 | */ | |
845 | scsi_lock(host); | |
846 | set_bit(US_FLIDX_DISCONNECTING, &us->dflags); | |
847 | scsi_unlock(host); | |
848 | wake_up(&us->delay_wait); | |
849 | } | |
850 | ||
851 | /* Second stage of disconnect processing: deallocate all resources */ | |
852 | static void release_everything(struct us_data *us) | |
853 | { | |
854 | usb_stor_release_resources(us); | |
855 | dissociate_dev(us); | |
856 | ||
857 | /* Drop our reference to the host; the SCSI core will free it | |
858 | * (and "us" along with it) when the refcount becomes 0. */ | |
859 | scsi_host_put(us_to_host(us)); | |
860 | } | |
861 | ||
862 | /* Delayed-work routine to carry out SCSI-device scanning */ | |
863 | static void usb_stor_scan_dwork(struct work_struct *work) | |
864 | { | |
865 | struct us_data *us = container_of(work, struct us_data, | |
866 | scan_dwork.work); | |
867 | struct device *dev = &us->pusb_intf->dev; | |
868 | ||
869 | dev_dbg(dev, "starting scan\n"); | |
870 | ||
871 | /* For bulk-only devices, determine the max LUN value */ | |
872 | if (us->protocol == USB_PR_BULK && !(us->fflags & US_FL_SINGLE_LUN)) { | |
873 | mutex_lock(&us->dev_mutex); | |
874 | us->max_lun = usb_stor_Bulk_max_lun(us); | |
875 | mutex_unlock(&us->dev_mutex); | |
876 | } | |
877 | scsi_scan_host(us_to_host(us)); | |
878 | dev_dbg(dev, "scan complete\n"); | |
879 | ||
880 | /* Should we unbind if no devices were detected? */ | |
881 | ||
882 | usb_autopm_put_interface(us->pusb_intf); | |
883 | clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags); | |
884 | } | |
885 | ||
886 | static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf) | |
887 | { | |
888 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
889 | ||
890 | if (usb_dev->bus->sg_tablesize) { | |
891 | return usb_dev->bus->sg_tablesize; | |
892 | } | |
893 | return SG_ALL; | |
894 | } | |
895 | ||
896 | /* First part of general USB mass-storage probing */ | |
897 | int usb_stor_probe1(struct us_data **pus, | |
898 | struct usb_interface *intf, | |
899 | const struct usb_device_id *id, | |
900 | struct us_unusual_dev *unusual_dev) | |
901 | { | |
902 | struct Scsi_Host *host; | |
903 | struct us_data *us; | |
904 | int result; | |
905 | ||
906 | US_DEBUGP("USB Mass Storage device detected\n"); | |
907 | ||
908 | /* | |
909 | * Ask the SCSI layer to allocate a host structure, with extra | |
910 | * space at the end for our private us_data structure. | |
911 | */ | |
912 | host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us)); | |
913 | if (!host) { | |
914 | dev_warn(&intf->dev, | |
915 | "Unable to allocate the scsi host\n"); | |
916 | return -ENOMEM; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Allow 16-byte CDBs and thus > 2TB | |
921 | */ | |
922 | host->max_cmd_len = 16; | |
923 | host->sg_tablesize = usb_stor_sg_tablesize(intf); | |
924 | *pus = us = host_to_us(host); | |
925 | memset(us, 0, sizeof(struct us_data)); | |
926 | mutex_init(&(us->dev_mutex)); | |
927 | us_set_lock_class(&us->dev_mutex, intf); | |
928 | init_completion(&us->cmnd_ready); | |
929 | init_completion(&(us->notify)); | |
930 | init_waitqueue_head(&us->delay_wait); | |
931 | INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork); | |
932 | ||
933 | /* Associate the us_data structure with the USB device */ | |
934 | result = associate_dev(us, intf); | |
935 | if (result) | |
936 | goto BadDevice; | |
937 | ||
938 | /* Get the unusual_devs entries and the descriptors */ | |
939 | result = get_device_info(us, id, unusual_dev); | |
940 | if (result) | |
941 | goto BadDevice; | |
942 | ||
943 | /* Get standard transport and protocol settings */ | |
944 | get_transport(us); | |
945 | get_protocol(us); | |
946 | ||
947 | /* Give the caller a chance to fill in specialized transport | |
948 | * or protocol settings. | |
949 | */ | |
950 | return 0; | |
951 | ||
952 | BadDevice: | |
953 | US_DEBUGP("storage_probe() failed\n"); | |
954 | release_everything(us); | |
955 | return result; | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(usb_stor_probe1); | |
958 | ||
959 | /* Second part of general USB mass-storage probing */ | |
960 | int usb_stor_probe2(struct us_data *us) | |
961 | { | |
962 | int result; | |
963 | struct device *dev = &us->pusb_intf->dev; | |
964 | ||
965 | /* Make sure the transport and protocol have both been set */ | |
966 | if (!us->transport || !us->proto_handler) { | |
967 | result = -ENXIO; | |
968 | goto BadDevice; | |
969 | } | |
970 | US_DEBUGP("Transport: %s\n", us->transport_name); | |
971 | US_DEBUGP("Protocol: %s\n", us->protocol_name); | |
972 | ||
973 | /* fix for single-lun devices */ | |
974 | if (us->fflags & US_FL_SINGLE_LUN) | |
975 | us->max_lun = 0; | |
976 | ||
977 | /* Find the endpoints and calculate pipe values */ | |
978 | result = get_pipes(us); | |
979 | if (result) | |
980 | goto BadDevice; | |
981 | ||
982 | /* | |
983 | * If the device returns invalid data for the first READ(10) | |
984 | * command, indicate the command should be retried. | |
985 | */ | |
986 | if (us->fflags & US_FL_INITIAL_READ10) | |
987 | set_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
988 | ||
989 | /* Acquire all the other resources and add the host */ | |
990 | result = usb_stor_acquire_resources(us); | |
991 | if (result) | |
992 | goto BadDevice; | |
993 | snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s", | |
994 | dev_name(&us->pusb_intf->dev)); | |
995 | result = scsi_add_host(us_to_host(us), dev); | |
996 | if (result) { | |
997 | dev_warn(dev, | |
998 | "Unable to add the scsi host\n"); | |
999 | goto BadDevice; | |
1000 | } | |
1001 | ||
1002 | /* Submit the delayed_work for SCSI-device scanning */ | |
1003 | usb_autopm_get_interface_no_resume(us->pusb_intf); | |
1004 | set_bit(US_FLIDX_SCAN_PENDING, &us->dflags); | |
1005 | ||
1006 | if (delay_use > 0) | |
1007 | dev_dbg(dev, "waiting for device to settle before scanning\n"); | |
1008 | queue_delayed_work(system_freezable_wq, &us->scan_dwork, | |
1009 | delay_use * HZ); | |
1010 | return 0; | |
1011 | ||
1012 | /* We come here if there are any problems */ | |
1013 | BadDevice: | |
1014 | US_DEBUGP("storage_probe() failed\n"); | |
1015 | release_everything(us); | |
1016 | return result; | |
1017 | } | |
1018 | EXPORT_SYMBOL_GPL(usb_stor_probe2); | |
1019 | ||
1020 | /* Handle a USB mass-storage disconnect */ | |
1021 | void usb_stor_disconnect(struct usb_interface *intf) | |
1022 | { | |
1023 | struct us_data *us = usb_get_intfdata(intf); | |
1024 | ||
1025 | US_DEBUGP("storage_disconnect() called\n"); | |
1026 | quiesce_and_remove_host(us); | |
1027 | release_everything(us); | |
1028 | } | |
1029 | EXPORT_SYMBOL_GPL(usb_stor_disconnect); | |
1030 | ||
1031 | /* The main probe routine for standard devices */ | |
1032 | static int storage_probe(struct usb_interface *intf, | |
1033 | const struct usb_device_id *id) | |
1034 | { | |
1035 | struct us_unusual_dev *unusual_dev; | |
1036 | struct us_data *us; | |
1037 | int result; | |
1038 | int size; | |
1039 | ||
1040 | /* | |
1041 | * If libusual is configured, let it decide whether a standard | |
1042 | * device should be handled by usb-storage or by ub. | |
1043 | * If the device isn't standard (is handled by a subdriver | |
1044 | * module) then don't accept it. | |
1045 | */ | |
1046 | if (usb_usual_check_type(id, USB_US_TYPE_STOR) || | |
1047 | usb_usual_ignore_device(intf)) | |
1048 | return -ENXIO; | |
1049 | ||
1050 | /* | |
1051 | * Call the general probe procedures. | |
1052 | * | |
1053 | * The unusual_dev_list array is parallel to the usb_storage_usb_ids | |
1054 | * table, so we use the index of the id entry to find the | |
1055 | * corresponding unusual_devs entry. | |
1056 | */ | |
1057 | ||
1058 | size = ARRAY_SIZE(us_unusual_dev_list); | |
1059 | if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) { | |
1060 | unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list; | |
1061 | } else { | |
1062 | unusual_dev = &for_dynamic_ids; | |
1063 | ||
1064 | US_DEBUGP("%s %s 0x%04x 0x%04x\n", "Use Bulk-Only transport", | |
1065 | "with the Transparent SCSI protocol for dynamic id:", | |
1066 | id->idVendor, id->idProduct); | |
1067 | } | |
1068 | ||
1069 | result = usb_stor_probe1(&us, intf, id, unusual_dev); | |
1070 | if (result) | |
1071 | return result; | |
1072 | ||
1073 | /* No special transport or protocol settings in the main module */ | |
1074 | ||
1075 | result = usb_stor_probe2(us); | |
1076 | return result; | |
1077 | } | |
1078 | ||
1079 | /*********************************************************************** | |
1080 | * Initialization and registration | |
1081 | ***********************************************************************/ | |
1082 | ||
1083 | static struct usb_driver usb_storage_driver = { | |
1084 | .name = "usb-storage", | |
1085 | .probe = storage_probe, | |
1086 | .disconnect = usb_stor_disconnect, | |
1087 | .suspend = usb_stor_suspend, | |
1088 | .resume = usb_stor_resume, | |
1089 | .reset_resume = usb_stor_reset_resume, | |
1090 | .pre_reset = usb_stor_pre_reset, | |
1091 | .post_reset = usb_stor_post_reset, | |
1092 | .id_table = usb_storage_usb_ids, | |
1093 | .supports_autosuspend = 1, | |
1094 | .soft_unbind = 1, | |
1095 | }; | |
1096 | ||
1097 | static int __init usb_stor_init(void) | |
1098 | { | |
1099 | int retval; | |
1100 | ||
1101 | pr_info("Initializing USB Mass Storage driver...\n"); | |
1102 | ||
1103 | /* register the driver, return usb_register return code if error */ | |
1104 | retval = usb_register(&usb_storage_driver); | |
1105 | if (retval == 0) { | |
1106 | pr_info("USB Mass Storage support registered.\n"); | |
1107 | usb_usual_set_present(USB_US_TYPE_STOR); | |
1108 | } | |
1109 | return retval; | |
1110 | } | |
1111 | ||
1112 | static void __exit usb_stor_exit(void) | |
1113 | { | |
1114 | US_DEBUGP("usb_stor_exit() called\n"); | |
1115 | ||
1116 | /* Deregister the driver | |
1117 | * This will cause disconnect() to be called for each | |
1118 | * attached unit | |
1119 | */ | |
1120 | US_DEBUGP("-- calling usb_deregister()\n"); | |
1121 | usb_deregister(&usb_storage_driver) ; | |
1122 | ||
1123 | usb_usual_clear_present(USB_US_TYPE_STOR); | |
1124 | } | |
1125 | ||
1126 | module_init(usb_stor_init); | |
1127 | module_exit(usb_stor_exit); |