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1da177e4 LT |
1 | /* Driver for USB Mass Storage compliant devices |
2 | * | |
3 | * $Id: usb.c,v 1.75 2002/04/22 03:39:43 mdharm Exp $ | |
4 | * | |
5 | * Current development and maintenance by: | |
6 | * (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
7 | * | |
8 | * Developed with the assistance of: | |
9 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
10 | * (c) 2003 Alan Stern (stern@rowland.harvard.edu) | |
11 | * | |
12 | * Initial work by: | |
13 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
14 | * | |
15 | * usb_device_id support by Adam J. Richter (adam@yggdrasil.com): | |
16 | * (c) 2000 Yggdrasil Computing, Inc. | |
17 | * | |
18 | * This driver is based on the 'USB Mass Storage Class' document. This | |
19 | * describes in detail the protocol used to communicate with such | |
20 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
21 | * mind when they created this document. The commands are all very | |
22 | * similar to commands in the SCSI-II and ATAPI specifications. | |
23 | * | |
24 | * It is important to note that in a number of cases this class | |
25 | * exhibits class-specific exemptions from the USB specification. | |
26 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
27 | * that they are used to communicate wait, failed and OK on commands. | |
28 | * | |
29 | * Also, for certain devices, the interrupt endpoint is used to convey | |
30 | * status of a command. | |
31 | * | |
32 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
33 | * information about this driver. | |
34 | * | |
35 | * This program is free software; you can redistribute it and/or modify it | |
36 | * under the terms of the GNU General Public License as published by the | |
37 | * Free Software Foundation; either version 2, or (at your option) any | |
38 | * later version. | |
39 | * | |
40 | * This program is distributed in the hope that it will be useful, but | |
41 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
43 | * General Public License for more details. | |
44 | * | |
45 | * You should have received a copy of the GNU General Public License along | |
46 | * with this program; if not, write to the Free Software Foundation, Inc., | |
47 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
48 | */ | |
49 | ||
50 | #include <linux/config.h> | |
51 | #include <linux/sched.h> | |
52 | #include <linux/errno.h> | |
53 | #include <linux/suspend.h> | |
54 | #include <linux/module.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/slab.h> | |
57 | ||
58 | #include <scsi/scsi.h> | |
59 | #include <scsi/scsi_cmnd.h> | |
60 | #include <scsi/scsi_device.h> | |
61 | ||
62 | #include "usb.h" | |
63 | #include "scsiglue.h" | |
64 | #include "transport.h" | |
65 | #include "protocol.h" | |
66 | #include "debug.h" | |
67 | #include "initializers.h" | |
68 | ||
69 | #ifdef CONFIG_USB_STORAGE_USBAT | |
70 | #include "shuttle_usbat.h" | |
71 | #endif | |
72 | #ifdef CONFIG_USB_STORAGE_SDDR09 | |
73 | #include "sddr09.h" | |
74 | #endif | |
75 | #ifdef CONFIG_USB_STORAGE_SDDR55 | |
76 | #include "sddr55.h" | |
77 | #endif | |
78 | #ifdef CONFIG_USB_STORAGE_DPCM | |
79 | #include "dpcm.h" | |
80 | #endif | |
81 | #ifdef CONFIG_USB_STORAGE_FREECOM | |
82 | #include "freecom.h" | |
83 | #endif | |
84 | #ifdef CONFIG_USB_STORAGE_ISD200 | |
85 | #include "isd200.h" | |
86 | #endif | |
87 | #ifdef CONFIG_USB_STORAGE_DATAFAB | |
88 | #include "datafab.h" | |
89 | #endif | |
90 | #ifdef CONFIG_USB_STORAGE_JUMPSHOT | |
91 | #include "jumpshot.h" | |
92 | #endif | |
34008dbf MD |
93 | #ifdef CONFIG_USB_STORAGE_ONETOUCH |
94 | #include "onetouch.h" | |
95 | #endif | |
1da177e4 LT |
96 | |
97 | /* Some informational data */ | |
98 | MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>"); | |
99 | MODULE_DESCRIPTION("USB Mass Storage driver for Linux"); | |
100 | MODULE_LICENSE("GPL"); | |
101 | ||
102 | static unsigned int delay_use = 5; | |
103 | module_param(delay_use, uint, S_IRUGO | S_IWUSR); | |
104 | MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device"); | |
105 | ||
106 | ||
107 | /* These are used to make sure the module doesn't unload before all the | |
108 | * threads have exited. | |
109 | */ | |
110 | static atomic_t total_threads = ATOMIC_INIT(0); | |
111 | static DECLARE_COMPLETION(threads_gone); | |
112 | ||
113 | ||
114 | static int storage_probe(struct usb_interface *iface, | |
115 | const struct usb_device_id *id); | |
116 | ||
117 | static void storage_disconnect(struct usb_interface *iface); | |
118 | ||
119 | /* The entries in this table, except for final ones here | |
120 | * (USB_MASS_STORAGE_CLASS and the empty entry), correspond, | |
121 | * line for line with the entries of us_unsuaul_dev_list[]. | |
122 | */ | |
123 | ||
124 | #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ | |
125 | vendorName, productName,useProtocol, useTransport, \ | |
126 | initFunction, flags) \ | |
127 | { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax) } | |
128 | ||
129 | static struct usb_device_id storage_usb_ids [] = { | |
130 | ||
131 | # include "unusual_devs.h" | |
132 | #undef UNUSUAL_DEV | |
133 | /* Control/Bulk transport for all SubClass values */ | |
134 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CB) }, | |
135 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CB) }, | |
136 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CB) }, | |
137 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CB) }, | |
138 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CB) }, | |
139 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CB) }, | |
140 | ||
141 | /* Control/Bulk/Interrupt transport for all SubClass values */ | |
142 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CBI) }, | |
143 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CBI) }, | |
144 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CBI) }, | |
145 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CBI) }, | |
146 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CBI) }, | |
147 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CBI) }, | |
148 | ||
149 | /* Bulk-only transport for all SubClass values */ | |
150 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_BULK) }, | |
151 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_BULK) }, | |
152 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_BULK) }, | |
153 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_BULK) }, | |
154 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_BULK) }, | |
155 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, | |
156 | ||
157 | /* Terminating entry */ | |
158 | { } | |
159 | }; | |
160 | ||
161 | MODULE_DEVICE_TABLE (usb, storage_usb_ids); | |
162 | ||
163 | /* This is the list of devices we recognize, along with their flag data */ | |
164 | ||
165 | /* The vendor name should be kept at eight characters or less, and | |
166 | * the product name should be kept at 16 characters or less. If a device | |
167 | * has the US_FL_FIX_INQUIRY flag, then the vendor and product names | |
168 | * normally generated by a device thorugh the INQUIRY response will be | |
169 | * taken from this list, and this is the reason for the above size | |
170 | * restriction. However, if the flag is not present, then you | |
171 | * are free to use as many characters as you like. | |
172 | */ | |
173 | ||
174 | #undef UNUSUAL_DEV | |
175 | #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ | |
176 | vendor_name, product_name, use_protocol, use_transport, \ | |
177 | init_function, Flags) \ | |
178 | { \ | |
179 | .vendorName = vendor_name, \ | |
180 | .productName = product_name, \ | |
181 | .useProtocol = use_protocol, \ | |
182 | .useTransport = use_transport, \ | |
183 | .initFunction = init_function, \ | |
184 | .flags = Flags, \ | |
185 | } | |
186 | ||
187 | static struct us_unusual_dev us_unusual_dev_list[] = { | |
188 | # include "unusual_devs.h" | |
189 | # undef UNUSUAL_DEV | |
190 | /* Control/Bulk transport for all SubClass values */ | |
191 | { .useProtocol = US_SC_RBC, | |
192 | .useTransport = US_PR_CB}, | |
193 | { .useProtocol = US_SC_8020, | |
194 | .useTransport = US_PR_CB}, | |
195 | { .useProtocol = US_SC_QIC, | |
196 | .useTransport = US_PR_CB}, | |
197 | { .useProtocol = US_SC_UFI, | |
198 | .useTransport = US_PR_CB}, | |
199 | { .useProtocol = US_SC_8070, | |
200 | .useTransport = US_PR_CB}, | |
201 | { .useProtocol = US_SC_SCSI, | |
202 | .useTransport = US_PR_CB}, | |
203 | ||
204 | /* Control/Bulk/Interrupt transport for all SubClass values */ | |
205 | { .useProtocol = US_SC_RBC, | |
206 | .useTransport = US_PR_CBI}, | |
207 | { .useProtocol = US_SC_8020, | |
208 | .useTransport = US_PR_CBI}, | |
209 | { .useProtocol = US_SC_QIC, | |
210 | .useTransport = US_PR_CBI}, | |
211 | { .useProtocol = US_SC_UFI, | |
212 | .useTransport = US_PR_CBI}, | |
213 | { .useProtocol = US_SC_8070, | |
214 | .useTransport = US_PR_CBI}, | |
215 | { .useProtocol = US_SC_SCSI, | |
216 | .useTransport = US_PR_CBI}, | |
217 | ||
218 | /* Bulk-only transport for all SubClass values */ | |
219 | { .useProtocol = US_SC_RBC, | |
220 | .useTransport = US_PR_BULK}, | |
221 | { .useProtocol = US_SC_8020, | |
222 | .useTransport = US_PR_BULK}, | |
223 | { .useProtocol = US_SC_QIC, | |
224 | .useTransport = US_PR_BULK}, | |
225 | { .useProtocol = US_SC_UFI, | |
226 | .useTransport = US_PR_BULK}, | |
227 | { .useProtocol = US_SC_8070, | |
228 | .useTransport = US_PR_BULK}, | |
229 | { .useProtocol = US_SC_SCSI, | |
230 | .useTransport = US_PR_BULK}, | |
231 | ||
232 | /* Terminating entry */ | |
233 | { NULL } | |
234 | }; | |
235 | ||
236 | static struct usb_driver usb_storage_driver = { | |
237 | .owner = THIS_MODULE, | |
238 | .name = "usb-storage", | |
239 | .probe = storage_probe, | |
240 | .disconnect = storage_disconnect, | |
241 | .id_table = storage_usb_ids, | |
242 | }; | |
243 | ||
244 | /* | |
245 | * fill_inquiry_response takes an unsigned char array (which must | |
246 | * be at least 36 characters) and populates the vendor name, | |
247 | * product name, and revision fields. Then the array is copied | |
248 | * into the SCSI command's response buffer (oddly enough | |
249 | * called request_buffer). data_len contains the length of the | |
250 | * data array, which again must be at least 36. | |
251 | */ | |
252 | ||
253 | void fill_inquiry_response(struct us_data *us, unsigned char *data, | |
254 | unsigned int data_len) | |
255 | { | |
256 | if (data_len<36) // You lose. | |
257 | return; | |
258 | ||
259 | if(data[0]&0x20) { /* USB device currently not connected. Return | |
260 | peripheral qualifier 001b ("...however, the | |
261 | physical device is not currently connected | |
262 | to this logical unit") and leave vendor and | |
263 | product identification empty. ("If the target | |
264 | does store some of the INQUIRY data on the | |
265 | device, it may return zeros or ASCII spaces | |
266 | (20h) in those fields until the data is | |
267 | available from the device."). */ | |
268 | memset(data+8,0,28); | |
269 | } else { | |
270 | u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice); | |
271 | memcpy(data+8, us->unusual_dev->vendorName, | |
272 | strlen(us->unusual_dev->vendorName) > 8 ? 8 : | |
273 | strlen(us->unusual_dev->vendorName)); | |
274 | memcpy(data+16, us->unusual_dev->productName, | |
275 | strlen(us->unusual_dev->productName) > 16 ? 16 : | |
276 | strlen(us->unusual_dev->productName)); | |
277 | data[32] = 0x30 + ((bcdDevice>>12) & 0x0F); | |
278 | data[33] = 0x30 + ((bcdDevice>>8) & 0x0F); | |
279 | data[34] = 0x30 + ((bcdDevice>>4) & 0x0F); | |
280 | data[35] = 0x30 + ((bcdDevice) & 0x0F); | |
281 | } | |
282 | ||
283 | usb_stor_set_xfer_buf(data, data_len, us->srb); | |
284 | } | |
285 | ||
286 | static int usb_stor_control_thread(void * __us) | |
287 | { | |
288 | struct us_data *us = (struct us_data *)__us; | |
289 | struct Scsi_Host *host = us_to_host(us); | |
290 | ||
291 | lock_kernel(); | |
292 | ||
293 | /* | |
294 | * This thread doesn't need any user-level access, | |
295 | * so get rid of all our resources. | |
296 | */ | |
297 | daemonize("usb-storage"); | |
298 | current->flags |= PF_NOFREEZE; | |
299 | unlock_kernel(); | |
300 | ||
301 | /* acquire a reference to the host, so it won't be deallocated | |
302 | * until we're ready to exit */ | |
303 | scsi_host_get(host); | |
304 | ||
305 | /* signal that we've started the thread */ | |
306 | complete(&(us->notify)); | |
307 | ||
308 | for(;;) { | |
309 | US_DEBUGP("*** thread sleeping.\n"); | |
310 | if(down_interruptible(&us->sema)) | |
311 | break; | |
312 | ||
313 | US_DEBUGP("*** thread awakened.\n"); | |
314 | ||
315 | /* lock the device pointers */ | |
316 | down(&(us->dev_semaphore)); | |
317 | ||
318 | /* if the device has disconnected, we are free to exit */ | |
319 | if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { | |
320 | US_DEBUGP("-- exiting\n"); | |
321 | up(&(us->dev_semaphore)); | |
322 | break; | |
323 | } | |
324 | ||
325 | /* lock access to the state */ | |
326 | scsi_lock(host); | |
327 | ||
328 | /* has the command timed out *already* ? */ | |
329 | if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) { | |
330 | us->srb->result = DID_ABORT << 16; | |
331 | goto SkipForAbort; | |
332 | } | |
333 | ||
334 | scsi_unlock(host); | |
335 | ||
336 | /* reject the command if the direction indicator | |
337 | * is UNKNOWN | |
338 | */ | |
339 | if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) { | |
340 | US_DEBUGP("UNKNOWN data direction\n"); | |
341 | us->srb->result = DID_ERROR << 16; | |
342 | } | |
343 | ||
344 | /* reject if target != 0 or if LUN is higher than | |
345 | * the maximum known LUN | |
346 | */ | |
347 | else if (us->srb->device->id && | |
348 | !(us->flags & US_FL_SCM_MULT_TARG)) { | |
349 | US_DEBUGP("Bad target number (%d:%d)\n", | |
350 | us->srb->device->id, us->srb->device->lun); | |
351 | us->srb->result = DID_BAD_TARGET << 16; | |
352 | } | |
353 | ||
354 | else if (us->srb->device->lun > us->max_lun) { | |
355 | US_DEBUGP("Bad LUN (%d:%d)\n", | |
356 | us->srb->device->id, us->srb->device->lun); | |
357 | us->srb->result = DID_BAD_TARGET << 16; | |
358 | } | |
359 | ||
360 | /* Handle those devices which need us to fake | |
361 | * their inquiry data */ | |
362 | else if ((us->srb->cmnd[0] == INQUIRY) && | |
363 | (us->flags & US_FL_FIX_INQUIRY)) { | |
364 | unsigned char data_ptr[36] = { | |
365 | 0x00, 0x80, 0x02, 0x02, | |
366 | 0x1F, 0x00, 0x00, 0x00}; | |
367 | ||
368 | US_DEBUGP("Faking INQUIRY command\n"); | |
369 | fill_inquiry_response(us, data_ptr, 36); | |
370 | us->srb->result = SAM_STAT_GOOD; | |
371 | } | |
372 | ||
373 | /* we've got a command, let's do it! */ | |
374 | else { | |
375 | US_DEBUG(usb_stor_show_command(us->srb)); | |
376 | us->proto_handler(us->srb, us); | |
377 | } | |
378 | ||
379 | /* lock access to the state */ | |
380 | scsi_lock(host); | |
381 | ||
382 | /* indicate that the command is done */ | |
383 | if (us->srb->result != DID_ABORT << 16) { | |
384 | US_DEBUGP("scsi cmd done, result=0x%x\n", | |
385 | us->srb->result); | |
386 | us->srb->scsi_done(us->srb); | |
387 | } else { | |
388 | SkipForAbort: | |
389 | US_DEBUGP("scsi command aborted\n"); | |
390 | } | |
391 | ||
392 | /* If an abort request was received we need to signal that | |
393 | * the abort has finished. The proper test for this is | |
394 | * the TIMED_OUT flag, not srb->result == DID_ABORT, because | |
395 | * a timeout/abort request might be received after all the | |
396 | * USB processing was complete. */ | |
397 | if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) | |
398 | complete(&(us->notify)); | |
399 | ||
400 | /* finished working on this command */ | |
401 | us->srb = NULL; | |
402 | scsi_unlock(host); | |
403 | ||
404 | /* unlock the device pointers */ | |
405 | up(&(us->dev_semaphore)); | |
406 | } /* for (;;) */ | |
407 | ||
408 | scsi_host_put(host); | |
409 | ||
410 | /* notify the exit routine that we're actually exiting now | |
411 | * | |
412 | * complete()/wait_for_completion() is similar to up()/down(), | |
413 | * except that complete() is safe in the case where the structure | |
414 | * is getting deleted in a parallel mode of execution (i.e. just | |
415 | * after the down() -- that's necessary for the thread-shutdown | |
416 | * case. | |
417 | * | |
418 | * complete_and_exit() goes even further than this -- it is safe in | |
419 | * the case that the thread of the caller is going away (not just | |
420 | * the structure) -- this is necessary for the module-remove case. | |
421 | * This is important in preemption kernels, which transfer the flow | |
422 | * of execution immediately upon a complete(). | |
423 | */ | |
424 | complete_and_exit(&threads_gone, 0); | |
425 | } | |
426 | ||
427 | /*********************************************************************** | |
428 | * Device probing and disconnecting | |
429 | ***********************************************************************/ | |
430 | ||
431 | /* Associate our private data with the USB device */ | |
432 | static int associate_dev(struct us_data *us, struct usb_interface *intf) | |
433 | { | |
434 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
435 | ||
436 | /* Fill in the device-related fields */ | |
437 | us->pusb_dev = interface_to_usbdev(intf); | |
438 | us->pusb_intf = intf; | |
439 | us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
440 | US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n", | |
441 | le16_to_cpu(us->pusb_dev->descriptor.idVendor), | |
442 | le16_to_cpu(us->pusb_dev->descriptor.idProduct), | |
443 | le16_to_cpu(us->pusb_dev->descriptor.bcdDevice)); | |
444 | US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n", | |
445 | intf->cur_altsetting->desc.bInterfaceSubClass, | |
446 | intf->cur_altsetting->desc.bInterfaceProtocol); | |
447 | ||
448 | /* Store our private data in the interface */ | |
449 | usb_set_intfdata(intf, us); | |
450 | ||
451 | /* Allocate the device-related DMA-mapped buffers */ | |
452 | us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr), | |
453 | GFP_KERNEL, &us->cr_dma); | |
454 | if (!us->cr) { | |
455 | US_DEBUGP("usb_ctrlrequest allocation failed\n"); | |
456 | return -ENOMEM; | |
457 | } | |
458 | ||
459 | us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE, | |
460 | GFP_KERNEL, &us->iobuf_dma); | |
461 | if (!us->iobuf) { | |
462 | US_DEBUGP("I/O buffer allocation failed\n"); | |
463 | return -ENOMEM; | |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
468 | /* Get the unusual_devs entries and the string descriptors */ | |
469 | static void get_device_info(struct us_data *us, int id_index) | |
470 | { | |
471 | struct usb_device *dev = us->pusb_dev; | |
472 | struct usb_interface_descriptor *idesc = | |
473 | &us->pusb_intf->cur_altsetting->desc; | |
474 | struct us_unusual_dev *unusual_dev = &us_unusual_dev_list[id_index]; | |
475 | struct usb_device_id *id = &storage_usb_ids[id_index]; | |
476 | ||
477 | /* Store the entries */ | |
478 | us->unusual_dev = unusual_dev; | |
479 | us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ? | |
480 | idesc->bInterfaceSubClass : | |
481 | unusual_dev->useProtocol; | |
482 | us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ? | |
483 | idesc->bInterfaceProtocol : | |
484 | unusual_dev->useTransport; | |
485 | us->flags = unusual_dev->flags; | |
486 | ||
487 | /* | |
488 | * This flag is only needed when we're in high-speed, so let's | |
489 | * disable it if we're in full-speed | |
490 | */ | |
491 | if (dev->speed != USB_SPEED_HIGH) | |
492 | us->flags &= ~US_FL_GO_SLOW; | |
493 | ||
494 | /* Log a message if a non-generic unusual_dev entry contains an | |
495 | * unnecessary subclass or protocol override. This may stimulate | |
496 | * reports from users that will help us remove unneeded entries | |
497 | * from the unusual_devs.h table. | |
498 | */ | |
499 | if (id->idVendor || id->idProduct) { | |
500 | static char *msgs[3] = { | |
501 | "an unneeded SubClass entry", | |
502 | "an unneeded Protocol entry", | |
503 | "unneeded SubClass and Protocol entries"}; | |
504 | struct usb_device_descriptor *ddesc = &dev->descriptor; | |
505 | int msg = -1; | |
506 | ||
507 | if (unusual_dev->useProtocol != US_SC_DEVICE && | |
508 | us->subclass == idesc->bInterfaceSubClass) | |
509 | msg += 1; | |
510 | if (unusual_dev->useTransport != US_PR_DEVICE && | |
511 | us->protocol == idesc->bInterfaceProtocol) | |
512 | msg += 2; | |
513 | if (msg >= 0 && !(unusual_dev->flags & US_FL_NEED_OVERRIDE)) | |
514 | printk(KERN_NOTICE USB_STORAGE "This device " | |
515 | "(%04x,%04x,%04x S %02x P %02x)" | |
516 | " has %s in unusual_devs.h\n" | |
517 | " Please send a copy of this message to " | |
518 | "<linux-usb-devel@lists.sourceforge.net>\n", | |
519 | le16_to_cpu(ddesc->idVendor), | |
520 | le16_to_cpu(ddesc->idProduct), | |
521 | le16_to_cpu(ddesc->bcdDevice), | |
522 | idesc->bInterfaceSubClass, | |
523 | idesc->bInterfaceProtocol, | |
524 | msgs[msg]); | |
525 | } | |
526 | } | |
527 | ||
528 | /* Get the transport settings */ | |
529 | static int get_transport(struct us_data *us) | |
530 | { | |
531 | switch (us->protocol) { | |
532 | case US_PR_CB: | |
533 | us->transport_name = "Control/Bulk"; | |
534 | us->transport = usb_stor_CB_transport; | |
535 | us->transport_reset = usb_stor_CB_reset; | |
536 | us->max_lun = 7; | |
537 | break; | |
538 | ||
539 | case US_PR_CBI: | |
540 | us->transport_name = "Control/Bulk/Interrupt"; | |
541 | us->transport = usb_stor_CBI_transport; | |
542 | us->transport_reset = usb_stor_CB_reset; | |
543 | us->max_lun = 7; | |
544 | break; | |
545 | ||
546 | case US_PR_BULK: | |
547 | us->transport_name = "Bulk"; | |
548 | us->transport = usb_stor_Bulk_transport; | |
549 | us->transport_reset = usb_stor_Bulk_reset; | |
550 | break; | |
551 | ||
552 | #ifdef CONFIG_USB_STORAGE_USBAT | |
553 | case US_PR_SCM_ATAPI: | |
554 | us->transport_name = "SCM/ATAPI"; | |
555 | us->transport = usbat_transport; | |
556 | us->transport_reset = usb_stor_CB_reset; | |
557 | us->max_lun = 1; | |
558 | break; | |
559 | #endif | |
560 | ||
561 | #ifdef CONFIG_USB_STORAGE_SDDR09 | |
562 | case US_PR_EUSB_SDDR09: | |
563 | us->transport_name = "EUSB/SDDR09"; | |
564 | us->transport = sddr09_transport; | |
565 | us->transport_reset = usb_stor_CB_reset; | |
566 | us->max_lun = 0; | |
567 | break; | |
568 | #endif | |
569 | ||
570 | #ifdef CONFIG_USB_STORAGE_SDDR55 | |
571 | case US_PR_SDDR55: | |
572 | us->transport_name = "SDDR55"; | |
573 | us->transport = sddr55_transport; | |
574 | us->transport_reset = sddr55_reset; | |
575 | us->max_lun = 0; | |
576 | break; | |
577 | #endif | |
578 | ||
579 | #ifdef CONFIG_USB_STORAGE_DPCM | |
580 | case US_PR_DPCM_USB: | |
581 | us->transport_name = "Control/Bulk-EUSB/SDDR09"; | |
582 | us->transport = dpcm_transport; | |
583 | us->transport_reset = usb_stor_CB_reset; | |
584 | us->max_lun = 1; | |
585 | break; | |
586 | #endif | |
587 | ||
588 | #ifdef CONFIG_USB_STORAGE_FREECOM | |
589 | case US_PR_FREECOM: | |
590 | us->transport_name = "Freecom"; | |
591 | us->transport = freecom_transport; | |
592 | us->transport_reset = usb_stor_freecom_reset; | |
593 | us->max_lun = 0; | |
594 | break; | |
595 | #endif | |
596 | ||
597 | #ifdef CONFIG_USB_STORAGE_DATAFAB | |
598 | case US_PR_DATAFAB: | |
599 | us->transport_name = "Datafab Bulk-Only"; | |
600 | us->transport = datafab_transport; | |
601 | us->transport_reset = usb_stor_Bulk_reset; | |
602 | us->max_lun = 1; | |
603 | break; | |
604 | #endif | |
605 | ||
606 | #ifdef CONFIG_USB_STORAGE_JUMPSHOT | |
607 | case US_PR_JUMPSHOT: | |
608 | us->transport_name = "Lexar Jumpshot Control/Bulk"; | |
609 | us->transport = jumpshot_transport; | |
610 | us->transport_reset = usb_stor_Bulk_reset; | |
611 | us->max_lun = 1; | |
612 | break; | |
613 | #endif | |
614 | ||
615 | default: | |
616 | return -EIO; | |
617 | } | |
618 | US_DEBUGP("Transport: %s\n", us->transport_name); | |
619 | ||
620 | /* fix for single-lun devices */ | |
621 | if (us->flags & US_FL_SINGLE_LUN) | |
622 | us->max_lun = 0; | |
623 | return 0; | |
624 | } | |
625 | ||
626 | /* Get the protocol settings */ | |
627 | static int get_protocol(struct us_data *us) | |
628 | { | |
629 | switch (us->subclass) { | |
630 | case US_SC_RBC: | |
631 | us->protocol_name = "Reduced Block Commands (RBC)"; | |
632 | us->proto_handler = usb_stor_transparent_scsi_command; | |
633 | break; | |
634 | ||
635 | case US_SC_8020: | |
636 | us->protocol_name = "8020i"; | |
637 | us->proto_handler = usb_stor_ATAPI_command; | |
638 | us->max_lun = 0; | |
639 | break; | |
640 | ||
641 | case US_SC_QIC: | |
642 | us->protocol_name = "QIC-157"; | |
643 | us->proto_handler = usb_stor_qic157_command; | |
644 | us->max_lun = 0; | |
645 | break; | |
646 | ||
647 | case US_SC_8070: | |
648 | us->protocol_name = "8070i"; | |
649 | us->proto_handler = usb_stor_ATAPI_command; | |
650 | us->max_lun = 0; | |
651 | break; | |
652 | ||
653 | case US_SC_SCSI: | |
654 | us->protocol_name = "Transparent SCSI"; | |
655 | us->proto_handler = usb_stor_transparent_scsi_command; | |
656 | break; | |
657 | ||
658 | case US_SC_UFI: | |
659 | us->protocol_name = "Uniform Floppy Interface (UFI)"; | |
660 | us->proto_handler = usb_stor_ufi_command; | |
661 | break; | |
662 | ||
663 | #ifdef CONFIG_USB_STORAGE_ISD200 | |
664 | case US_SC_ISD200: | |
665 | us->protocol_name = "ISD200 ATA/ATAPI"; | |
666 | us->proto_handler = isd200_ata_command; | |
667 | break; | |
668 | #endif | |
669 | ||
670 | default: | |
671 | return -EIO; | |
672 | } | |
673 | US_DEBUGP("Protocol: %s\n", us->protocol_name); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | /* Get the pipe settings */ | |
678 | static int get_pipes(struct us_data *us) | |
679 | { | |
680 | struct usb_host_interface *altsetting = | |
681 | us->pusb_intf->cur_altsetting; | |
682 | int i; | |
683 | struct usb_endpoint_descriptor *ep; | |
684 | struct usb_endpoint_descriptor *ep_in = NULL; | |
685 | struct usb_endpoint_descriptor *ep_out = NULL; | |
686 | struct usb_endpoint_descriptor *ep_int = NULL; | |
687 | ||
688 | /* | |
689 | * Find the endpoints we need. | |
690 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
691 | * An optional interrupt is OK (necessary for CBI protocol). | |
692 | * We will ignore any others. | |
693 | */ | |
694 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
695 | ep = &altsetting->endpoint[i].desc; | |
696 | ||
697 | /* Is it a BULK endpoint? */ | |
698 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
699 | == USB_ENDPOINT_XFER_BULK) { | |
700 | /* BULK in or out? */ | |
701 | if (ep->bEndpointAddress & USB_DIR_IN) | |
702 | ep_in = ep; | |
703 | else | |
704 | ep_out = ep; | |
705 | } | |
706 | ||
707 | /* Is it an interrupt endpoint? */ | |
708 | else if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
709 | == USB_ENDPOINT_XFER_INT) { | |
710 | ep_int = ep; | |
711 | } | |
712 | } | |
713 | ||
714 | if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) { | |
715 | US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n"); | |
716 | return -EIO; | |
717 | } | |
718 | ||
719 | /* Calculate and store the pipe values */ | |
720 | us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0); | |
721 | us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0); | |
722 | us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, | |
723 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
724 | us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, | |
725 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
726 | if (ep_int) { | |
727 | us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, | |
728 | ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
729 | us->ep_bInterval = ep_int->bInterval; | |
730 | } | |
731 | return 0; | |
732 | } | |
733 | ||
734 | /* Initialize all the dynamic resources we need */ | |
735 | static int usb_stor_acquire_resources(struct us_data *us) | |
736 | { | |
737 | int p; | |
738 | ||
739 | us->current_urb = usb_alloc_urb(0, GFP_KERNEL); | |
740 | if (!us->current_urb) { | |
741 | US_DEBUGP("URB allocation failed\n"); | |
742 | return -ENOMEM; | |
743 | } | |
744 | ||
745 | /* Lock the device while we carry out the next two operations */ | |
746 | down(&us->dev_semaphore); | |
747 | ||
748 | /* For bulk-only devices, determine the max LUN value */ | |
749 | if (us->protocol == US_PR_BULK) { | |
750 | p = usb_stor_Bulk_max_lun(us); | |
751 | if (p < 0) { | |
752 | up(&us->dev_semaphore); | |
753 | return p; | |
754 | } | |
755 | us->max_lun = p; | |
756 | } | |
757 | ||
758 | /* Just before we start our control thread, initialize | |
759 | * the device if it needs initialization */ | |
760 | if (us->unusual_dev->initFunction) | |
761 | us->unusual_dev->initFunction(us); | |
762 | ||
763 | up(&us->dev_semaphore); | |
764 | ||
765 | /* Start up our control thread */ | |
766 | p = kernel_thread(usb_stor_control_thread, us, CLONE_VM); | |
767 | if (p < 0) { | |
768 | printk(KERN_WARNING USB_STORAGE | |
769 | "Unable to start control thread\n"); | |
770 | return p; | |
771 | } | |
772 | us->pid = p; | |
773 | atomic_inc(&total_threads); | |
774 | ||
775 | /* Wait for the thread to start */ | |
776 | wait_for_completion(&(us->notify)); | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | /* Release all our dynamic resources */ | |
782 | static void usb_stor_release_resources(struct us_data *us) | |
783 | { | |
784 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
785 | ||
786 | /* Tell the control thread to exit. The SCSI host must | |
787 | * already have been removed so it won't try to queue | |
788 | * any more commands. | |
789 | */ | |
790 | US_DEBUGP("-- sending exit command to thread\n"); | |
77f46328 | 791 | set_bit(US_FLIDX_DISCONNECTING, &us->flags); |
1da177e4 LT |
792 | up(&us->sema); |
793 | ||
794 | /* Call the destructor routine, if it exists */ | |
795 | if (us->extra_destructor) { | |
796 | US_DEBUGP("-- calling extra_destructor()\n"); | |
797 | us->extra_destructor(us->extra); | |
798 | } | |
799 | ||
800 | /* Free the extra data and the URB */ | |
801 | kfree(us->extra); | |
802 | usb_free_urb(us->current_urb); | |
803 | } | |
804 | ||
805 | /* Dissociate from the USB device */ | |
806 | static void dissociate_dev(struct us_data *us) | |
807 | { | |
808 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
809 | ||
810 | /* Free the device-related DMA-mapped buffers */ | |
811 | if (us->cr) | |
812 | usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr, | |
813 | us->cr_dma); | |
814 | if (us->iobuf) | |
815 | usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, | |
816 | us->iobuf_dma); | |
817 | ||
818 | /* Remove our private data from the interface */ | |
819 | usb_set_intfdata(us->pusb_intf, NULL); | |
820 | } | |
821 | ||
77f46328 MD |
822 | /* First stage of disconnect processing: stop all commands and remove |
823 | * the host */ | |
824 | static void quiesce_and_remove_host(struct us_data *us) | |
825 | { | |
826 | /* Prevent new USB transfers, stop the current command, and | |
827 | * interrupt a SCSI-scan or device-reset delay */ | |
828 | set_bit(US_FLIDX_DISCONNECTING, &us->flags); | |
829 | usb_stor_stop_transport(us); | |
830 | wake_up(&us->delay_wait); | |
831 | ||
832 | /* It doesn't matter if the SCSI-scanning thread is still running. | |
833 | * The thread will exit when it sees the DISCONNECTING flag. */ | |
834 | ||
835 | /* Wait for the current command to finish, then remove the host */ | |
836 | down(&us->dev_semaphore); | |
837 | up(&us->dev_semaphore); | |
26186ba7 MD |
838 | |
839 | /* queuecommand won't accept any new commands and the control | |
840 | * thread won't execute a previously-queued command. If there | |
841 | * is such a command pending, complete it with an error. */ | |
842 | if (us->srb) { | |
843 | us->srb->result = DID_NO_CONNECT << 16; | |
844 | scsi_lock(us_to_host(us)); | |
845 | us->srb->scsi_done(us->srb); | |
846 | us->srb = NULL; | |
847 | scsi_unlock(us_to_host(us)); | |
848 | } | |
849 | ||
850 | /* Now we own no commands so it's safe to remove the SCSI host */ | |
77f46328 MD |
851 | scsi_remove_host(us_to_host(us)); |
852 | } | |
853 | ||
854 | /* Second stage of disconnect processing: deallocate all resources */ | |
855 | static void release_everything(struct us_data *us) | |
856 | { | |
857 | usb_stor_release_resources(us); | |
858 | dissociate_dev(us); | |
859 | ||
860 | /* Drop our reference to the host; the SCSI core will free it | |
861 | * (and "us" along with it) when the refcount becomes 0. */ | |
862 | scsi_host_put(us_to_host(us)); | |
863 | } | |
864 | ||
1da177e4 LT |
865 | /* Thread to carry out delayed SCSI-device scanning */ |
866 | static int usb_stor_scan_thread(void * __us) | |
867 | { | |
868 | struct us_data *us = (struct us_data *)__us; | |
869 | ||
870 | /* | |
871 | * This thread doesn't need any user-level access, | |
872 | * so get rid of all our resources. | |
873 | */ | |
874 | lock_kernel(); | |
875 | daemonize("usb-stor-scan"); | |
876 | unlock_kernel(); | |
877 | ||
878 | /* Acquire a reference to the host, so it won't be deallocated | |
879 | * until we're ready to exit */ | |
880 | scsi_host_get(us_to_host(us)); | |
881 | ||
882 | /* Signal that we've started the thread */ | |
883 | complete(&(us->notify)); | |
884 | ||
885 | printk(KERN_DEBUG | |
886 | "usb-storage: device found at %d\n", us->pusb_dev->devnum); | |
887 | ||
888 | /* Wait for the timeout to expire or for a disconnect */ | |
889 | if (delay_use > 0) { | |
890 | printk(KERN_DEBUG "usb-storage: waiting for device " | |
891 | "to settle before scanning\n"); | |
892 | retry: | |
893 | wait_event_interruptible_timeout(us->delay_wait, | |
894 | test_bit(US_FLIDX_DISCONNECTING, &us->flags), | |
895 | delay_use * HZ); | |
3e1d1d28 | 896 | if (try_to_freeze()) |
1da177e4 | 897 | goto retry; |
1da177e4 LT |
898 | } |
899 | ||
900 | /* If the device is still connected, perform the scanning */ | |
901 | if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { | |
902 | scsi_scan_host(us_to_host(us)); | |
903 | printk(KERN_DEBUG "usb-storage: device scan complete\n"); | |
904 | ||
905 | /* Should we unbind if no devices were detected? */ | |
906 | } | |
907 | ||
908 | scsi_host_put(us_to_host(us)); | |
909 | complete_and_exit(&threads_gone, 0); | |
910 | } | |
911 | ||
912 | ||
913 | /* Probe to see if we can drive a newly-connected USB device */ | |
914 | static int storage_probe(struct usb_interface *intf, | |
915 | const struct usb_device_id *id) | |
916 | { | |
917 | struct Scsi_Host *host; | |
918 | struct us_data *us; | |
919 | const int id_index = id - storage_usb_ids; | |
920 | int result; | |
921 | ||
922 | US_DEBUGP("USB Mass Storage device detected\n"); | |
923 | ||
924 | /* | |
925 | * Ask the SCSI layer to allocate a host structure, with extra | |
926 | * space at the end for our private us_data structure. | |
927 | */ | |
928 | host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us)); | |
929 | if (!host) { | |
930 | printk(KERN_WARNING USB_STORAGE | |
931 | "Unable to allocate the scsi host\n"); | |
932 | return -ENOMEM; | |
933 | } | |
934 | ||
935 | us = host_to_us(host); | |
936 | memset(us, 0, sizeof(struct us_data)); | |
937 | init_MUTEX(&(us->dev_semaphore)); | |
938 | init_MUTEX_LOCKED(&(us->sema)); | |
939 | init_completion(&(us->notify)); | |
940 | init_waitqueue_head(&us->delay_wait); | |
941 | ||
942 | /* Associate the us_data structure with the USB device */ | |
943 | result = associate_dev(us, intf); | |
944 | if (result) | |
945 | goto BadDevice; | |
946 | ||
947 | /* | |
948 | * Get the unusual_devs entries and the descriptors | |
949 | * | |
950 | * id_index is calculated in the declaration to be the index number | |
951 | * of the match from the usb_device_id table, so we can find the | |
952 | * corresponding entry in the private table. | |
953 | */ | |
954 | get_device_info(us, id_index); | |
955 | ||
956 | #ifdef CONFIG_USB_STORAGE_SDDR09 | |
957 | if (us->protocol == US_PR_EUSB_SDDR09 || | |
958 | us->protocol == US_PR_DPCM_USB) { | |
959 | /* set the configuration -- STALL is an acceptable response here */ | |
960 | if (us->pusb_dev->actconfig->desc.bConfigurationValue != 1) { | |
961 | US_DEBUGP("active config #%d != 1 ??\n", us->pusb_dev | |
962 | ->actconfig->desc.bConfigurationValue); | |
963 | goto BadDevice; | |
964 | } | |
965 | result = usb_reset_configuration(us->pusb_dev); | |
966 | ||
967 | US_DEBUGP("Result of usb_reset_configuration is %d\n", result); | |
968 | if (result == -EPIPE) { | |
969 | US_DEBUGP("-- stall on control interface\n"); | |
970 | } else if (result != 0) { | |
971 | /* it's not a stall, but another error -- time to bail */ | |
972 | US_DEBUGP("-- Unknown error. Rejecting device\n"); | |
973 | goto BadDevice; | |
974 | } | |
975 | } | |
976 | #endif | |
977 | ||
978 | /* Get the transport, protocol, and pipe settings */ | |
979 | result = get_transport(us); | |
980 | if (result) | |
981 | goto BadDevice; | |
982 | result = get_protocol(us); | |
983 | if (result) | |
984 | goto BadDevice; | |
985 | result = get_pipes(us); | |
986 | if (result) | |
987 | goto BadDevice; | |
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 | result = scsi_add_host(host, &intf->dev); | |
994 | if (result) { | |
995 | printk(KERN_WARNING USB_STORAGE | |
996 | "Unable to add the scsi host\n"); | |
997 | goto BadDevice; | |
998 | } | |
999 | ||
1000 | /* Start up the thread for delayed SCSI-device scanning */ | |
1001 | result = kernel_thread(usb_stor_scan_thread, us, CLONE_VM); | |
1002 | if (result < 0) { | |
1003 | printk(KERN_WARNING USB_STORAGE | |
1004 | "Unable to start the device-scanning thread\n"); | |
77f46328 | 1005 | quiesce_and_remove_host(us); |
1da177e4 LT |
1006 | goto BadDevice; |
1007 | } | |
1008 | atomic_inc(&total_threads); | |
1009 | ||
1010 | /* Wait for the thread to start */ | |
1011 | wait_for_completion(&(us->notify)); | |
1012 | ||
1013 | return 0; | |
1014 | ||
1015 | /* We come here if there are any problems */ | |
1016 | BadDevice: | |
1017 | US_DEBUGP("storage_probe() failed\n"); | |
77f46328 | 1018 | release_everything(us); |
1da177e4 LT |
1019 | return result; |
1020 | } | |
1021 | ||
1022 | /* Handle a disconnect event from the USB core */ | |
1023 | static void storage_disconnect(struct usb_interface *intf) | |
1024 | { | |
1025 | struct us_data *us = usb_get_intfdata(intf); | |
1026 | ||
1027 | US_DEBUGP("storage_disconnect() called\n"); | |
77f46328 MD |
1028 | quiesce_and_remove_host(us); |
1029 | release_everything(us); | |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | /*********************************************************************** | |
1033 | * Initialization and registration | |
1034 | ***********************************************************************/ | |
1035 | ||
1036 | static int __init usb_stor_init(void) | |
1037 | { | |
1038 | int retval; | |
1039 | printk(KERN_INFO "Initializing USB Mass Storage driver...\n"); | |
1040 | ||
1041 | /* register the driver, return usb_register return code if error */ | |
1042 | retval = usb_register(&usb_storage_driver); | |
1043 | if (retval == 0) | |
1044 | printk(KERN_INFO "USB Mass Storage support registered.\n"); | |
1045 | ||
1046 | return retval; | |
1047 | } | |
1048 | ||
1049 | static void __exit usb_stor_exit(void) | |
1050 | { | |
1051 | US_DEBUGP("usb_stor_exit() called\n"); | |
1052 | ||
1053 | /* Deregister the driver | |
1054 | * This will cause disconnect() to be called for each | |
1055 | * attached unit | |
1056 | */ | |
1057 | US_DEBUGP("-- calling usb_deregister()\n"); | |
1058 | usb_deregister(&usb_storage_driver) ; | |
1059 | ||
1060 | /* Don't return until all of our control and scanning threads | |
1061 | * have exited. Since each thread signals threads_gone as its | |
1062 | * last act, we have to call wait_for_completion the right number | |
1063 | * of times. | |
1064 | */ | |
1065 | while (atomic_read(&total_threads) > 0) { | |
1066 | wait_for_completion(&threads_gone); | |
1067 | atomic_dec(&total_threads); | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | module_init(usb_stor_init); | |
1072 | module_exit(usb_stor_exit); |