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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 | ||
1da177e4 LT |
114 | /* The entries in this table, except for final ones here |
115 | * (USB_MASS_STORAGE_CLASS and the empty entry), correspond, | |
116 | * line for line with the entries of us_unsuaul_dev_list[]. | |
117 | */ | |
118 | ||
119 | #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ | |
120 | vendorName, productName,useProtocol, useTransport, \ | |
121 | initFunction, flags) \ | |
122 | { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax) } | |
123 | ||
124 | static struct usb_device_id storage_usb_ids [] = { | |
125 | ||
126 | # include "unusual_devs.h" | |
127 | #undef UNUSUAL_DEV | |
128 | /* Control/Bulk transport for all SubClass values */ | |
129 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CB) }, | |
130 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CB) }, | |
131 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CB) }, | |
132 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CB) }, | |
133 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CB) }, | |
134 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CB) }, | |
135 | ||
136 | /* Control/Bulk/Interrupt transport for all SubClass values */ | |
137 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CBI) }, | |
138 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CBI) }, | |
139 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CBI) }, | |
140 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CBI) }, | |
141 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CBI) }, | |
142 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CBI) }, | |
143 | ||
144 | /* Bulk-only transport for all SubClass values */ | |
145 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_BULK) }, | |
146 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_BULK) }, | |
147 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_BULK) }, | |
148 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_BULK) }, | |
149 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_BULK) }, | |
150 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, | |
151 | ||
152 | /* Terminating entry */ | |
153 | { } | |
154 | }; | |
155 | ||
156 | MODULE_DEVICE_TABLE (usb, storage_usb_ids); | |
157 | ||
158 | /* This is the list of devices we recognize, along with their flag data */ | |
159 | ||
160 | /* The vendor name should be kept at eight characters or less, and | |
161 | * the product name should be kept at 16 characters or less. If a device | |
162 | * has the US_FL_FIX_INQUIRY flag, then the vendor and product names | |
163 | * normally generated by a device thorugh the INQUIRY response will be | |
164 | * taken from this list, and this is the reason for the above size | |
165 | * restriction. However, if the flag is not present, then you | |
166 | * are free to use as many characters as you like. | |
167 | */ | |
168 | ||
169 | #undef UNUSUAL_DEV | |
170 | #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ | |
171 | vendor_name, product_name, use_protocol, use_transport, \ | |
172 | init_function, Flags) \ | |
173 | { \ | |
174 | .vendorName = vendor_name, \ | |
175 | .productName = product_name, \ | |
176 | .useProtocol = use_protocol, \ | |
177 | .useTransport = use_transport, \ | |
178 | .initFunction = init_function, \ | |
179 | .flags = Flags, \ | |
180 | } | |
181 | ||
182 | static struct us_unusual_dev us_unusual_dev_list[] = { | |
183 | # include "unusual_devs.h" | |
184 | # undef UNUSUAL_DEV | |
185 | /* Control/Bulk transport for all SubClass values */ | |
186 | { .useProtocol = US_SC_RBC, | |
187 | .useTransport = US_PR_CB}, | |
188 | { .useProtocol = US_SC_8020, | |
189 | .useTransport = US_PR_CB}, | |
190 | { .useProtocol = US_SC_QIC, | |
191 | .useTransport = US_PR_CB}, | |
192 | { .useProtocol = US_SC_UFI, | |
193 | .useTransport = US_PR_CB}, | |
194 | { .useProtocol = US_SC_8070, | |
195 | .useTransport = US_PR_CB}, | |
196 | { .useProtocol = US_SC_SCSI, | |
197 | .useTransport = US_PR_CB}, | |
198 | ||
199 | /* Control/Bulk/Interrupt transport for all SubClass values */ | |
200 | { .useProtocol = US_SC_RBC, | |
201 | .useTransport = US_PR_CBI}, | |
202 | { .useProtocol = US_SC_8020, | |
203 | .useTransport = US_PR_CBI}, | |
204 | { .useProtocol = US_SC_QIC, | |
205 | .useTransport = US_PR_CBI}, | |
206 | { .useProtocol = US_SC_UFI, | |
207 | .useTransport = US_PR_CBI}, | |
208 | { .useProtocol = US_SC_8070, | |
209 | .useTransport = US_PR_CBI}, | |
210 | { .useProtocol = US_SC_SCSI, | |
211 | .useTransport = US_PR_CBI}, | |
212 | ||
213 | /* Bulk-only transport for all SubClass values */ | |
214 | { .useProtocol = US_SC_RBC, | |
215 | .useTransport = US_PR_BULK}, | |
216 | { .useProtocol = US_SC_8020, | |
217 | .useTransport = US_PR_BULK}, | |
218 | { .useProtocol = US_SC_QIC, | |
219 | .useTransport = US_PR_BULK}, | |
220 | { .useProtocol = US_SC_UFI, | |
221 | .useTransport = US_PR_BULK}, | |
222 | { .useProtocol = US_SC_8070, | |
223 | .useTransport = US_PR_BULK}, | |
224 | { .useProtocol = US_SC_SCSI, | |
225 | .useTransport = US_PR_BULK}, | |
226 | ||
227 | /* Terminating entry */ | |
228 | { NULL } | |
229 | }; | |
230 | ||
ce2596df AS |
231 | |
232 | #ifdef CONFIG_PM /* Minimal support for suspend and resume */ | |
233 | ||
234 | static int storage_suspend(struct usb_interface *iface, pm_message_t message) | |
235 | { | |
236 | struct us_data *us = usb_get_intfdata(iface); | |
237 | ||
238 | /* Wait until no command is running */ | |
239 | down(&us->dev_semaphore); | |
240 | ||
241 | US_DEBUGP("%s\n", __FUNCTION__); | |
242 | iface->dev.power.power_state.event = message.event; | |
243 | ||
244 | /* When runtime PM is working, we'll set a flag to indicate | |
245 | * whether we should autoresume when a SCSI request arrives. */ | |
246 | ||
247 | up(&us->dev_semaphore); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static int storage_resume(struct usb_interface *iface) | |
252 | { | |
253 | struct us_data *us = usb_get_intfdata(iface); | |
254 | ||
255 | down(&us->dev_semaphore); | |
256 | ||
257 | US_DEBUGP("%s\n", __FUNCTION__); | |
258 | iface->dev.power.power_state.event = PM_EVENT_ON; | |
259 | ||
260 | up(&us->dev_semaphore); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | #endif /* CONFIG_PM */ | |
1da177e4 LT |
265 | |
266 | /* | |
267 | * fill_inquiry_response takes an unsigned char array (which must | |
268 | * be at least 36 characters) and populates the vendor name, | |
269 | * product name, and revision fields. Then the array is copied | |
270 | * into the SCSI command's response buffer (oddly enough | |
271 | * called request_buffer). data_len contains the length of the | |
272 | * data array, which again must be at least 36. | |
273 | */ | |
274 | ||
275 | void fill_inquiry_response(struct us_data *us, unsigned char *data, | |
276 | unsigned int data_len) | |
277 | { | |
278 | if (data_len<36) // You lose. | |
279 | return; | |
280 | ||
281 | if(data[0]&0x20) { /* USB device currently not connected. Return | |
282 | peripheral qualifier 001b ("...however, the | |
283 | physical device is not currently connected | |
284 | to this logical unit") and leave vendor and | |
285 | product identification empty. ("If the target | |
286 | does store some of the INQUIRY data on the | |
287 | device, it may return zeros or ASCII spaces | |
288 | (20h) in those fields until the data is | |
289 | available from the device."). */ | |
290 | memset(data+8,0,28); | |
291 | } else { | |
292 | u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice); | |
293 | memcpy(data+8, us->unusual_dev->vendorName, | |
294 | strlen(us->unusual_dev->vendorName) > 8 ? 8 : | |
295 | strlen(us->unusual_dev->vendorName)); | |
296 | memcpy(data+16, us->unusual_dev->productName, | |
297 | strlen(us->unusual_dev->productName) > 16 ? 16 : | |
298 | strlen(us->unusual_dev->productName)); | |
299 | data[32] = 0x30 + ((bcdDevice>>12) & 0x0F); | |
300 | data[33] = 0x30 + ((bcdDevice>>8) & 0x0F); | |
301 | data[34] = 0x30 + ((bcdDevice>>4) & 0x0F); | |
302 | data[35] = 0x30 + ((bcdDevice) & 0x0F); | |
303 | } | |
304 | ||
305 | usb_stor_set_xfer_buf(data, data_len, us->srb); | |
306 | } | |
307 | ||
308 | static int usb_stor_control_thread(void * __us) | |
309 | { | |
310 | struct us_data *us = (struct us_data *)__us; | |
311 | struct Scsi_Host *host = us_to_host(us); | |
312 | ||
313 | lock_kernel(); | |
314 | ||
315 | /* | |
316 | * This thread doesn't need any user-level access, | |
317 | * so get rid of all our resources. | |
318 | */ | |
319 | daemonize("usb-storage"); | |
320 | current->flags |= PF_NOFREEZE; | |
321 | unlock_kernel(); | |
322 | ||
323 | /* acquire a reference to the host, so it won't be deallocated | |
324 | * until we're ready to exit */ | |
325 | scsi_host_get(host); | |
326 | ||
327 | /* signal that we've started the thread */ | |
328 | complete(&(us->notify)); | |
329 | ||
330 | for(;;) { | |
331 | US_DEBUGP("*** thread sleeping.\n"); | |
332 | if(down_interruptible(&us->sema)) | |
333 | break; | |
334 | ||
335 | US_DEBUGP("*** thread awakened.\n"); | |
336 | ||
337 | /* lock the device pointers */ | |
338 | down(&(us->dev_semaphore)); | |
339 | ||
340 | /* if the device has disconnected, we are free to exit */ | |
341 | if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { | |
342 | US_DEBUGP("-- exiting\n"); | |
343 | up(&(us->dev_semaphore)); | |
344 | break; | |
345 | } | |
346 | ||
347 | /* lock access to the state */ | |
348 | scsi_lock(host); | |
349 | ||
350 | /* has the command timed out *already* ? */ | |
351 | if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) { | |
352 | us->srb->result = DID_ABORT << 16; | |
353 | goto SkipForAbort; | |
354 | } | |
355 | ||
356 | scsi_unlock(host); | |
357 | ||
358 | /* reject the command if the direction indicator | |
359 | * is UNKNOWN | |
360 | */ | |
361 | if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) { | |
362 | US_DEBUGP("UNKNOWN data direction\n"); | |
363 | us->srb->result = DID_ERROR << 16; | |
364 | } | |
365 | ||
366 | /* reject if target != 0 or if LUN is higher than | |
367 | * the maximum known LUN | |
368 | */ | |
369 | else if (us->srb->device->id && | |
370 | !(us->flags & US_FL_SCM_MULT_TARG)) { | |
371 | US_DEBUGP("Bad target number (%d:%d)\n", | |
372 | us->srb->device->id, us->srb->device->lun); | |
373 | us->srb->result = DID_BAD_TARGET << 16; | |
374 | } | |
375 | ||
376 | else if (us->srb->device->lun > us->max_lun) { | |
377 | US_DEBUGP("Bad LUN (%d:%d)\n", | |
378 | us->srb->device->id, us->srb->device->lun); | |
379 | us->srb->result = DID_BAD_TARGET << 16; | |
380 | } | |
381 | ||
382 | /* Handle those devices which need us to fake | |
383 | * their inquiry data */ | |
384 | else if ((us->srb->cmnd[0] == INQUIRY) && | |
385 | (us->flags & US_FL_FIX_INQUIRY)) { | |
386 | unsigned char data_ptr[36] = { | |
387 | 0x00, 0x80, 0x02, 0x02, | |
388 | 0x1F, 0x00, 0x00, 0x00}; | |
389 | ||
390 | US_DEBUGP("Faking INQUIRY command\n"); | |
391 | fill_inquiry_response(us, data_ptr, 36); | |
392 | us->srb->result = SAM_STAT_GOOD; | |
393 | } | |
394 | ||
395 | /* we've got a command, let's do it! */ | |
396 | else { | |
397 | US_DEBUG(usb_stor_show_command(us->srb)); | |
398 | us->proto_handler(us->srb, us); | |
399 | } | |
400 | ||
401 | /* lock access to the state */ | |
402 | scsi_lock(host); | |
403 | ||
404 | /* indicate that the command is done */ | |
405 | if (us->srb->result != DID_ABORT << 16) { | |
406 | US_DEBUGP("scsi cmd done, result=0x%x\n", | |
407 | us->srb->result); | |
408 | us->srb->scsi_done(us->srb); | |
409 | } else { | |
410 | SkipForAbort: | |
411 | US_DEBUGP("scsi command aborted\n"); | |
412 | } | |
413 | ||
414 | /* If an abort request was received we need to signal that | |
415 | * the abort has finished. The proper test for this is | |
416 | * the TIMED_OUT flag, not srb->result == DID_ABORT, because | |
226173ed MD |
417 | * the timeout might have occurred after the command had |
418 | * already completed with a different result code. */ | |
419 | if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) { | |
1da177e4 LT |
420 | complete(&(us->notify)); |
421 | ||
226173ed MD |
422 | /* Allow USB transfers to resume */ |
423 | clear_bit(US_FLIDX_ABORTING, &us->flags); | |
424 | clear_bit(US_FLIDX_TIMED_OUT, &us->flags); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | /* finished working on this command */ |
428 | us->srb = NULL; | |
429 | scsi_unlock(host); | |
430 | ||
431 | /* unlock the device pointers */ | |
432 | up(&(us->dev_semaphore)); | |
433 | } /* for (;;) */ | |
434 | ||
435 | scsi_host_put(host); | |
436 | ||
437 | /* notify the exit routine that we're actually exiting now | |
438 | * | |
439 | * complete()/wait_for_completion() is similar to up()/down(), | |
440 | * except that complete() is safe in the case where the structure | |
441 | * is getting deleted in a parallel mode of execution (i.e. just | |
442 | * after the down() -- that's necessary for the thread-shutdown | |
443 | * case. | |
444 | * | |
445 | * complete_and_exit() goes even further than this -- it is safe in | |
446 | * the case that the thread of the caller is going away (not just | |
447 | * the structure) -- this is necessary for the module-remove case. | |
448 | * This is important in preemption kernels, which transfer the flow | |
449 | * of execution immediately upon a complete(). | |
450 | */ | |
451 | complete_and_exit(&threads_gone, 0); | |
452 | } | |
453 | ||
454 | /*********************************************************************** | |
455 | * Device probing and disconnecting | |
456 | ***********************************************************************/ | |
457 | ||
458 | /* Associate our private data with the USB device */ | |
459 | static int associate_dev(struct us_data *us, struct usb_interface *intf) | |
460 | { | |
461 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
462 | ||
463 | /* Fill in the device-related fields */ | |
464 | us->pusb_dev = interface_to_usbdev(intf); | |
465 | us->pusb_intf = intf; | |
466 | us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
467 | US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n", | |
468 | le16_to_cpu(us->pusb_dev->descriptor.idVendor), | |
469 | le16_to_cpu(us->pusb_dev->descriptor.idProduct), | |
470 | le16_to_cpu(us->pusb_dev->descriptor.bcdDevice)); | |
471 | US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n", | |
472 | intf->cur_altsetting->desc.bInterfaceSubClass, | |
473 | intf->cur_altsetting->desc.bInterfaceProtocol); | |
474 | ||
475 | /* Store our private data in the interface */ | |
476 | usb_set_intfdata(intf, us); | |
477 | ||
478 | /* Allocate the device-related DMA-mapped buffers */ | |
479 | us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr), | |
480 | GFP_KERNEL, &us->cr_dma); | |
481 | if (!us->cr) { | |
482 | US_DEBUGP("usb_ctrlrequest allocation failed\n"); | |
483 | return -ENOMEM; | |
484 | } | |
485 | ||
486 | us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE, | |
487 | GFP_KERNEL, &us->iobuf_dma); | |
488 | if (!us->iobuf) { | |
489 | US_DEBUGP("I/O buffer allocation failed\n"); | |
490 | return -ENOMEM; | |
491 | } | |
bbafa466 AS |
492 | |
493 | us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL); | |
494 | if (!us->sensebuf) { | |
495 | US_DEBUGP("Sense buffer allocation failed\n"); | |
496 | return -ENOMEM; | |
497 | } | |
1da177e4 LT |
498 | return 0; |
499 | } | |
500 | ||
501 | /* Get the unusual_devs entries and the string descriptors */ | |
502 | static void get_device_info(struct us_data *us, int id_index) | |
503 | { | |
504 | struct usb_device *dev = us->pusb_dev; | |
505 | struct usb_interface_descriptor *idesc = | |
506 | &us->pusb_intf->cur_altsetting->desc; | |
507 | struct us_unusual_dev *unusual_dev = &us_unusual_dev_list[id_index]; | |
508 | struct usb_device_id *id = &storage_usb_ids[id_index]; | |
509 | ||
510 | /* Store the entries */ | |
511 | us->unusual_dev = unusual_dev; | |
512 | us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ? | |
513 | idesc->bInterfaceSubClass : | |
514 | unusual_dev->useProtocol; | |
515 | us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ? | |
516 | idesc->bInterfaceProtocol : | |
517 | unusual_dev->useTransport; | |
518 | us->flags = unusual_dev->flags; | |
519 | ||
520 | /* | |
521 | * This flag is only needed when we're in high-speed, so let's | |
522 | * disable it if we're in full-speed | |
523 | */ | |
524 | if (dev->speed != USB_SPEED_HIGH) | |
525 | us->flags &= ~US_FL_GO_SLOW; | |
526 | ||
527 | /* Log a message if a non-generic unusual_dev entry contains an | |
528 | * unnecessary subclass or protocol override. This may stimulate | |
529 | * reports from users that will help us remove unneeded entries | |
530 | * from the unusual_devs.h table. | |
531 | */ | |
532 | if (id->idVendor || id->idProduct) { | |
533 | static char *msgs[3] = { | |
534 | "an unneeded SubClass entry", | |
535 | "an unneeded Protocol entry", | |
536 | "unneeded SubClass and Protocol entries"}; | |
537 | struct usb_device_descriptor *ddesc = &dev->descriptor; | |
538 | int msg = -1; | |
539 | ||
540 | if (unusual_dev->useProtocol != US_SC_DEVICE && | |
541 | us->subclass == idesc->bInterfaceSubClass) | |
542 | msg += 1; | |
543 | if (unusual_dev->useTransport != US_PR_DEVICE && | |
544 | us->protocol == idesc->bInterfaceProtocol) | |
545 | msg += 2; | |
546 | if (msg >= 0 && !(unusual_dev->flags & US_FL_NEED_OVERRIDE)) | |
547 | printk(KERN_NOTICE USB_STORAGE "This device " | |
548 | "(%04x,%04x,%04x S %02x P %02x)" | |
549 | " has %s in unusual_devs.h\n" | |
550 | " Please send a copy of this message to " | |
551 | "<linux-usb-devel@lists.sourceforge.net>\n", | |
552 | le16_to_cpu(ddesc->idVendor), | |
553 | le16_to_cpu(ddesc->idProduct), | |
554 | le16_to_cpu(ddesc->bcdDevice), | |
555 | idesc->bInterfaceSubClass, | |
556 | idesc->bInterfaceProtocol, | |
557 | msgs[msg]); | |
558 | } | |
559 | } | |
560 | ||
561 | /* Get the transport settings */ | |
562 | static int get_transport(struct us_data *us) | |
563 | { | |
564 | switch (us->protocol) { | |
565 | case US_PR_CB: | |
566 | us->transport_name = "Control/Bulk"; | |
567 | us->transport = usb_stor_CB_transport; | |
568 | us->transport_reset = usb_stor_CB_reset; | |
569 | us->max_lun = 7; | |
570 | break; | |
571 | ||
572 | case US_PR_CBI: | |
573 | us->transport_name = "Control/Bulk/Interrupt"; | |
574 | us->transport = usb_stor_CBI_transport; | |
575 | us->transport_reset = usb_stor_CB_reset; | |
576 | us->max_lun = 7; | |
577 | break; | |
578 | ||
579 | case US_PR_BULK: | |
580 | us->transport_name = "Bulk"; | |
581 | us->transport = usb_stor_Bulk_transport; | |
582 | us->transport_reset = usb_stor_Bulk_reset; | |
583 | break; | |
584 | ||
585 | #ifdef CONFIG_USB_STORAGE_USBAT | |
b7b1e655 DD |
586 | case US_PR_USBAT: |
587 | us->transport_name = "Shuttle USBAT"; | |
1da177e4 LT |
588 | us->transport = usbat_transport; |
589 | us->transport_reset = usb_stor_CB_reset; | |
590 | us->max_lun = 1; | |
591 | break; | |
592 | #endif | |
593 | ||
594 | #ifdef CONFIG_USB_STORAGE_SDDR09 | |
595 | case US_PR_EUSB_SDDR09: | |
596 | us->transport_name = "EUSB/SDDR09"; | |
597 | us->transport = sddr09_transport; | |
598 | us->transport_reset = usb_stor_CB_reset; | |
599 | us->max_lun = 0; | |
600 | break; | |
601 | #endif | |
602 | ||
603 | #ifdef CONFIG_USB_STORAGE_SDDR55 | |
604 | case US_PR_SDDR55: | |
605 | us->transport_name = "SDDR55"; | |
606 | us->transport = sddr55_transport; | |
607 | us->transport_reset = sddr55_reset; | |
608 | us->max_lun = 0; | |
609 | break; | |
610 | #endif | |
611 | ||
612 | #ifdef CONFIG_USB_STORAGE_DPCM | |
613 | case US_PR_DPCM_USB: | |
614 | us->transport_name = "Control/Bulk-EUSB/SDDR09"; | |
615 | us->transport = dpcm_transport; | |
616 | us->transport_reset = usb_stor_CB_reset; | |
617 | us->max_lun = 1; | |
618 | break; | |
619 | #endif | |
620 | ||
621 | #ifdef CONFIG_USB_STORAGE_FREECOM | |
622 | case US_PR_FREECOM: | |
623 | us->transport_name = "Freecom"; | |
624 | us->transport = freecom_transport; | |
625 | us->transport_reset = usb_stor_freecom_reset; | |
626 | us->max_lun = 0; | |
627 | break; | |
628 | #endif | |
629 | ||
630 | #ifdef CONFIG_USB_STORAGE_DATAFAB | |
631 | case US_PR_DATAFAB: | |
632 | us->transport_name = "Datafab Bulk-Only"; | |
633 | us->transport = datafab_transport; | |
634 | us->transport_reset = usb_stor_Bulk_reset; | |
635 | us->max_lun = 1; | |
636 | break; | |
637 | #endif | |
638 | ||
639 | #ifdef CONFIG_USB_STORAGE_JUMPSHOT | |
640 | case US_PR_JUMPSHOT: | |
641 | us->transport_name = "Lexar Jumpshot Control/Bulk"; | |
642 | us->transport = jumpshot_transport; | |
643 | us->transport_reset = usb_stor_Bulk_reset; | |
644 | us->max_lun = 1; | |
645 | break; | |
646 | #endif | |
647 | ||
648 | default: | |
649 | return -EIO; | |
650 | } | |
651 | US_DEBUGP("Transport: %s\n", us->transport_name); | |
652 | ||
653 | /* fix for single-lun devices */ | |
654 | if (us->flags & US_FL_SINGLE_LUN) | |
655 | us->max_lun = 0; | |
656 | return 0; | |
657 | } | |
658 | ||
659 | /* Get the protocol settings */ | |
660 | static int get_protocol(struct us_data *us) | |
661 | { | |
662 | switch (us->subclass) { | |
663 | case US_SC_RBC: | |
664 | us->protocol_name = "Reduced Block Commands (RBC)"; | |
665 | us->proto_handler = usb_stor_transparent_scsi_command; | |
666 | break; | |
667 | ||
668 | case US_SC_8020: | |
669 | us->protocol_name = "8020i"; | |
670 | us->proto_handler = usb_stor_ATAPI_command; | |
671 | us->max_lun = 0; | |
672 | break; | |
673 | ||
674 | case US_SC_QIC: | |
675 | us->protocol_name = "QIC-157"; | |
676 | us->proto_handler = usb_stor_qic157_command; | |
677 | us->max_lun = 0; | |
678 | break; | |
679 | ||
680 | case US_SC_8070: | |
681 | us->protocol_name = "8070i"; | |
682 | us->proto_handler = usb_stor_ATAPI_command; | |
683 | us->max_lun = 0; | |
684 | break; | |
685 | ||
686 | case US_SC_SCSI: | |
687 | us->protocol_name = "Transparent SCSI"; | |
688 | us->proto_handler = usb_stor_transparent_scsi_command; | |
689 | break; | |
690 | ||
691 | case US_SC_UFI: | |
692 | us->protocol_name = "Uniform Floppy Interface (UFI)"; | |
693 | us->proto_handler = usb_stor_ufi_command; | |
694 | break; | |
695 | ||
696 | #ifdef CONFIG_USB_STORAGE_ISD200 | |
697 | case US_SC_ISD200: | |
698 | us->protocol_name = "ISD200 ATA/ATAPI"; | |
699 | us->proto_handler = isd200_ata_command; | |
700 | break; | |
701 | #endif | |
702 | ||
703 | default: | |
704 | return -EIO; | |
705 | } | |
706 | US_DEBUGP("Protocol: %s\n", us->protocol_name); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | /* Get the pipe settings */ | |
711 | static int get_pipes(struct us_data *us) | |
712 | { | |
713 | struct usb_host_interface *altsetting = | |
714 | us->pusb_intf->cur_altsetting; | |
715 | int i; | |
716 | struct usb_endpoint_descriptor *ep; | |
717 | struct usb_endpoint_descriptor *ep_in = NULL; | |
718 | struct usb_endpoint_descriptor *ep_out = NULL; | |
719 | struct usb_endpoint_descriptor *ep_int = NULL; | |
720 | ||
721 | /* | |
722 | * Find the endpoints we need. | |
723 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
724 | * An optional interrupt is OK (necessary for CBI protocol). | |
725 | * We will ignore any others. | |
726 | */ | |
727 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
728 | ep = &altsetting->endpoint[i].desc; | |
729 | ||
730 | /* Is it a BULK endpoint? */ | |
731 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
732 | == USB_ENDPOINT_XFER_BULK) { | |
733 | /* BULK in or out? */ | |
734 | if (ep->bEndpointAddress & USB_DIR_IN) | |
735 | ep_in = ep; | |
736 | else | |
737 | ep_out = ep; | |
738 | } | |
739 | ||
740 | /* Is it an interrupt endpoint? */ | |
741 | else if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
742 | == USB_ENDPOINT_XFER_INT) { | |
743 | ep_int = ep; | |
744 | } | |
745 | } | |
746 | ||
747 | if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) { | |
748 | US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n"); | |
749 | return -EIO; | |
750 | } | |
751 | ||
752 | /* Calculate and store the pipe values */ | |
753 | us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0); | |
754 | us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0); | |
755 | us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, | |
756 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
757 | us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, | |
758 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
759 | if (ep_int) { | |
760 | us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, | |
761 | ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
762 | us->ep_bInterval = ep_int->bInterval; | |
763 | } | |
764 | return 0; | |
765 | } | |
766 | ||
767 | /* Initialize all the dynamic resources we need */ | |
768 | static int usb_stor_acquire_resources(struct us_data *us) | |
769 | { | |
770 | int p; | |
771 | ||
772 | us->current_urb = usb_alloc_urb(0, GFP_KERNEL); | |
773 | if (!us->current_urb) { | |
774 | US_DEBUGP("URB allocation failed\n"); | |
775 | return -ENOMEM; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | /* Just before we start our control thread, initialize |
779 | * the device if it needs initialization */ | |
b876aef7 AS |
780 | if (us->unusual_dev->initFunction) { |
781 | p = us->unusual_dev->initFunction(us); | |
782 | if (p) | |
783 | return p; | |
784 | } | |
1da177e4 LT |
785 | |
786 | /* Start up our control thread */ | |
787 | p = kernel_thread(usb_stor_control_thread, us, CLONE_VM); | |
788 | if (p < 0) { | |
789 | printk(KERN_WARNING USB_STORAGE | |
790 | "Unable to start control thread\n"); | |
791 | return p; | |
792 | } | |
793 | us->pid = p; | |
794 | atomic_inc(&total_threads); | |
795 | ||
796 | /* Wait for the thread to start */ | |
797 | wait_for_completion(&(us->notify)); | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | /* Release all our dynamic resources */ | |
803 | static void usb_stor_release_resources(struct us_data *us) | |
804 | { | |
805 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
806 | ||
807 | /* Tell the control thread to exit. The SCSI host must | |
808 | * already have been removed so it won't try to queue | |
809 | * any more commands. | |
810 | */ | |
811 | US_DEBUGP("-- sending exit command to thread\n"); | |
77f46328 | 812 | set_bit(US_FLIDX_DISCONNECTING, &us->flags); |
1da177e4 LT |
813 | up(&us->sema); |
814 | ||
815 | /* Call the destructor routine, if it exists */ | |
816 | if (us->extra_destructor) { | |
817 | US_DEBUGP("-- calling extra_destructor()\n"); | |
818 | us->extra_destructor(us->extra); | |
819 | } | |
820 | ||
821 | /* Free the extra data and the URB */ | |
822 | kfree(us->extra); | |
823 | usb_free_urb(us->current_urb); | |
824 | } | |
825 | ||
826 | /* Dissociate from the USB device */ | |
827 | static void dissociate_dev(struct us_data *us) | |
828 | { | |
829 | US_DEBUGP("-- %s\n", __FUNCTION__); | |
830 | ||
bbafa466 AS |
831 | kfree(us->sensebuf); |
832 | ||
1da177e4 LT |
833 | /* Free the device-related DMA-mapped buffers */ |
834 | if (us->cr) | |
835 | usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr, | |
836 | us->cr_dma); | |
837 | if (us->iobuf) | |
838 | usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, | |
839 | us->iobuf_dma); | |
840 | ||
841 | /* Remove our private data from the interface */ | |
842 | usb_set_intfdata(us->pusb_intf, NULL); | |
843 | } | |
844 | ||
77f46328 MD |
845 | /* First stage of disconnect processing: stop all commands and remove |
846 | * the host */ | |
847 | static void quiesce_and_remove_host(struct us_data *us) | |
848 | { | |
849 | /* Prevent new USB transfers, stop the current command, and | |
850 | * interrupt a SCSI-scan or device-reset delay */ | |
851 | set_bit(US_FLIDX_DISCONNECTING, &us->flags); | |
852 | usb_stor_stop_transport(us); | |
853 | wake_up(&us->delay_wait); | |
854 | ||
855 | /* It doesn't matter if the SCSI-scanning thread is still running. | |
856 | * The thread will exit when it sees the DISCONNECTING flag. */ | |
857 | ||
858 | /* Wait for the current command to finish, then remove the host */ | |
859 | down(&us->dev_semaphore); | |
860 | up(&us->dev_semaphore); | |
26186ba7 MD |
861 | |
862 | /* queuecommand won't accept any new commands and the control | |
863 | * thread won't execute a previously-queued command. If there | |
864 | * is such a command pending, complete it with an error. */ | |
865 | if (us->srb) { | |
866 | us->srb->result = DID_NO_CONNECT << 16; | |
867 | scsi_lock(us_to_host(us)); | |
868 | us->srb->scsi_done(us->srb); | |
869 | us->srb = NULL; | |
870 | scsi_unlock(us_to_host(us)); | |
871 | } | |
872 | ||
873 | /* Now we own no commands so it's safe to remove the SCSI host */ | |
77f46328 MD |
874 | scsi_remove_host(us_to_host(us)); |
875 | } | |
876 | ||
877 | /* Second stage of disconnect processing: deallocate all resources */ | |
878 | static void release_everything(struct us_data *us) | |
879 | { | |
880 | usb_stor_release_resources(us); | |
881 | dissociate_dev(us); | |
882 | ||
883 | /* Drop our reference to the host; the SCSI core will free it | |
884 | * (and "us" along with it) when the refcount becomes 0. */ | |
885 | scsi_host_put(us_to_host(us)); | |
886 | } | |
887 | ||
1da177e4 LT |
888 | /* Thread to carry out delayed SCSI-device scanning */ |
889 | static int usb_stor_scan_thread(void * __us) | |
890 | { | |
891 | struct us_data *us = (struct us_data *)__us; | |
892 | ||
893 | /* | |
894 | * This thread doesn't need any user-level access, | |
895 | * so get rid of all our resources. | |
896 | */ | |
897 | lock_kernel(); | |
898 | daemonize("usb-stor-scan"); | |
899 | unlock_kernel(); | |
900 | ||
901 | /* Acquire a reference to the host, so it won't be deallocated | |
902 | * until we're ready to exit */ | |
903 | scsi_host_get(us_to_host(us)); | |
904 | ||
905 | /* Signal that we've started the thread */ | |
906 | complete(&(us->notify)); | |
907 | ||
908 | printk(KERN_DEBUG | |
909 | "usb-storage: device found at %d\n", us->pusb_dev->devnum); | |
910 | ||
911 | /* Wait for the timeout to expire or for a disconnect */ | |
912 | if (delay_use > 0) { | |
913 | printk(KERN_DEBUG "usb-storage: waiting for device " | |
914 | "to settle before scanning\n"); | |
915 | retry: | |
916 | wait_event_interruptible_timeout(us->delay_wait, | |
917 | test_bit(US_FLIDX_DISCONNECTING, &us->flags), | |
918 | delay_use * HZ); | |
3e1d1d28 | 919 | if (try_to_freeze()) |
1da177e4 | 920 | goto retry; |
1da177e4 LT |
921 | } |
922 | ||
923 | /* If the device is still connected, perform the scanning */ | |
924 | if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { | |
b876aef7 AS |
925 | |
926 | /* For bulk-only devices, determine the max LUN value */ | |
927 | if (us->protocol == US_PR_BULK && | |
928 | !(us->flags & US_FL_SINGLE_LUN)) { | |
929 | down(&us->dev_semaphore); | |
930 | us->max_lun = usb_stor_Bulk_max_lun(us); | |
931 | up(&us->dev_semaphore); | |
932 | } | |
1da177e4 LT |
933 | scsi_scan_host(us_to_host(us)); |
934 | printk(KERN_DEBUG "usb-storage: device scan complete\n"); | |
935 | ||
936 | /* Should we unbind if no devices were detected? */ | |
937 | } | |
938 | ||
939 | scsi_host_put(us_to_host(us)); | |
940 | complete_and_exit(&threads_gone, 0); | |
941 | } | |
942 | ||
943 | ||
944 | /* Probe to see if we can drive a newly-connected USB device */ | |
945 | static int storage_probe(struct usb_interface *intf, | |
946 | const struct usb_device_id *id) | |
947 | { | |
948 | struct Scsi_Host *host; | |
949 | struct us_data *us; | |
950 | const int id_index = id - storage_usb_ids; | |
951 | int result; | |
952 | ||
953 | US_DEBUGP("USB Mass Storage device detected\n"); | |
954 | ||
955 | /* | |
956 | * Ask the SCSI layer to allocate a host structure, with extra | |
957 | * space at the end for our private us_data structure. | |
958 | */ | |
959 | host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us)); | |
960 | if (!host) { | |
961 | printk(KERN_WARNING USB_STORAGE | |
962 | "Unable to allocate the scsi host\n"); | |
963 | return -ENOMEM; | |
964 | } | |
965 | ||
966 | us = host_to_us(host); | |
967 | memset(us, 0, sizeof(struct us_data)); | |
968 | init_MUTEX(&(us->dev_semaphore)); | |
969 | init_MUTEX_LOCKED(&(us->sema)); | |
970 | init_completion(&(us->notify)); | |
971 | init_waitqueue_head(&us->delay_wait); | |
972 | ||
973 | /* Associate the us_data structure with the USB device */ | |
974 | result = associate_dev(us, intf); | |
975 | if (result) | |
976 | goto BadDevice; | |
977 | ||
978 | /* | |
979 | * Get the unusual_devs entries and the descriptors | |
980 | * | |
981 | * id_index is calculated in the declaration to be the index number | |
982 | * of the match from the usb_device_id table, so we can find the | |
983 | * corresponding entry in the private table. | |
984 | */ | |
985 | get_device_info(us, id_index); | |
986 | ||
987 | #ifdef CONFIG_USB_STORAGE_SDDR09 | |
988 | if (us->protocol == US_PR_EUSB_SDDR09 || | |
989 | us->protocol == US_PR_DPCM_USB) { | |
990 | /* set the configuration -- STALL is an acceptable response here */ | |
991 | if (us->pusb_dev->actconfig->desc.bConfigurationValue != 1) { | |
992 | US_DEBUGP("active config #%d != 1 ??\n", us->pusb_dev | |
993 | ->actconfig->desc.bConfigurationValue); | |
994 | goto BadDevice; | |
995 | } | |
996 | result = usb_reset_configuration(us->pusb_dev); | |
997 | ||
998 | US_DEBUGP("Result of usb_reset_configuration is %d\n", result); | |
999 | if (result == -EPIPE) { | |
1000 | US_DEBUGP("-- stall on control interface\n"); | |
1001 | } else if (result != 0) { | |
1002 | /* it's not a stall, but another error -- time to bail */ | |
1003 | US_DEBUGP("-- Unknown error. Rejecting device\n"); | |
1004 | goto BadDevice; | |
1005 | } | |
1006 | } | |
1007 | #endif | |
1008 | ||
1009 | /* Get the transport, protocol, and pipe settings */ | |
1010 | result = get_transport(us); | |
1011 | if (result) | |
1012 | goto BadDevice; | |
1013 | result = get_protocol(us); | |
1014 | if (result) | |
1015 | goto BadDevice; | |
1016 | result = get_pipes(us); | |
1017 | if (result) | |
1018 | goto BadDevice; | |
1019 | ||
1020 | /* Acquire all the other resources and add the host */ | |
1021 | result = usb_stor_acquire_resources(us); | |
1022 | if (result) | |
1023 | goto BadDevice; | |
1024 | result = scsi_add_host(host, &intf->dev); | |
1025 | if (result) { | |
1026 | printk(KERN_WARNING USB_STORAGE | |
1027 | "Unable to add the scsi host\n"); | |
1028 | goto BadDevice; | |
1029 | } | |
1030 | ||
1031 | /* Start up the thread for delayed SCSI-device scanning */ | |
1032 | result = kernel_thread(usb_stor_scan_thread, us, CLONE_VM); | |
1033 | if (result < 0) { | |
1034 | printk(KERN_WARNING USB_STORAGE | |
1035 | "Unable to start the device-scanning thread\n"); | |
77f46328 | 1036 | quiesce_and_remove_host(us); |
1da177e4 LT |
1037 | goto BadDevice; |
1038 | } | |
1039 | atomic_inc(&total_threads); | |
1040 | ||
1041 | /* Wait for the thread to start */ | |
1042 | wait_for_completion(&(us->notify)); | |
1043 | ||
1044 | return 0; | |
1045 | ||
1046 | /* We come here if there are any problems */ | |
1047 | BadDevice: | |
1048 | US_DEBUGP("storage_probe() failed\n"); | |
77f46328 | 1049 | release_everything(us); |
1da177e4 LT |
1050 | return result; |
1051 | } | |
1052 | ||
1053 | /* Handle a disconnect event from the USB core */ | |
1054 | static void storage_disconnect(struct usb_interface *intf) | |
1055 | { | |
1056 | struct us_data *us = usb_get_intfdata(intf); | |
1057 | ||
1058 | US_DEBUGP("storage_disconnect() called\n"); | |
77f46328 MD |
1059 | quiesce_and_remove_host(us); |
1060 | release_everything(us); | |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | /*********************************************************************** | |
1064 | * Initialization and registration | |
1065 | ***********************************************************************/ | |
1066 | ||
ce2596df AS |
1067 | static struct usb_driver usb_storage_driver = { |
1068 | .owner = THIS_MODULE, | |
1069 | .name = "usb-storage", | |
1070 | .probe = storage_probe, | |
1071 | .disconnect = storage_disconnect, | |
1072 | #ifdef CONFIG_PM | |
1073 | .suspend = storage_suspend, | |
1074 | .resume = storage_resume, | |
1075 | #endif | |
1076 | .id_table = storage_usb_ids, | |
1077 | }; | |
1078 | ||
1da177e4 LT |
1079 | static int __init usb_stor_init(void) |
1080 | { | |
1081 | int retval; | |
1082 | printk(KERN_INFO "Initializing USB Mass Storage driver...\n"); | |
1083 | ||
1084 | /* register the driver, return usb_register return code if error */ | |
1085 | retval = usb_register(&usb_storage_driver); | |
1086 | if (retval == 0) | |
1087 | printk(KERN_INFO "USB Mass Storage support registered.\n"); | |
1088 | ||
1089 | return retval; | |
1090 | } | |
1091 | ||
1092 | static void __exit usb_stor_exit(void) | |
1093 | { | |
1094 | US_DEBUGP("usb_stor_exit() called\n"); | |
1095 | ||
1096 | /* Deregister the driver | |
1097 | * This will cause disconnect() to be called for each | |
1098 | * attached unit | |
1099 | */ | |
1100 | US_DEBUGP("-- calling usb_deregister()\n"); | |
1101 | usb_deregister(&usb_storage_driver) ; | |
1102 | ||
1103 | /* Don't return until all of our control and scanning threads | |
1104 | * have exited. Since each thread signals threads_gone as its | |
1105 | * last act, we have to call wait_for_completion the right number | |
1106 | * of times. | |
1107 | */ | |
1108 | while (atomic_read(&total_threads) > 0) { | |
1109 | wait_for_completion(&threads_gone); | |
1110 | atomic_dec(&total_threads); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | module_init(usb_stor_init); | |
1115 | module_exit(usb_stor_exit); |