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Commit | Line | Data |
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f0183a33 FB |
1 | /* |
2 | * Driver for USB Mass Storage compliant devices | |
1da177e4 LT |
3 | * |
4 | * Current development and maintenance by: | |
5 | * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
6 | * | |
7 | * Developed with the assistance of: | |
8 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
9 | * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) | |
10 | * (c) 2002 Alan Stern <stern@rowland.org> | |
11 | * | |
12 | * Initial work by: | |
13 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
14 | * | |
15 | * This driver is based on the 'USB Mass Storage Class' document. This | |
16 | * describes in detail the protocol used to communicate with such | |
17 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
18 | * mind when they created this document. The commands are all very | |
19 | * similar to commands in the SCSI-II and ATAPI specifications. | |
20 | * | |
21 | * It is important to note that in a number of cases this class | |
22 | * exhibits class-specific exemptions from the USB specification. | |
23 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
24 | * that they are used to communicate wait, failed and OK on commands. | |
25 | * | |
26 | * Also, for certain devices, the interrupt endpoint is used to convey | |
27 | * status of a command. | |
28 | * | |
29 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
30 | * information about this driver. | |
31 | * | |
32 | * This program is free software; you can redistribute it and/or modify it | |
33 | * under the terms of the GNU General Public License as published by the | |
34 | * Free Software Foundation; either version 2, or (at your option) any | |
35 | * later version. | |
36 | * | |
37 | * This program is distributed in the hope that it will be useful, but | |
38 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
39 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
40 | * General Public License for more details. | |
41 | * | |
42 | * You should have received a copy of the GNU General Public License along | |
43 | * with this program; if not, write to the Free Software Foundation, Inc., | |
44 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
45 | */ | |
46 | ||
1da177e4 | 47 | #include <linux/sched.h> |
5a0e3ad6 | 48 | #include <linux/gfp.h> |
1da177e4 | 49 | #include <linux/errno.h> |
f940fcd8 | 50 | #include <linux/export.h> |
1da177e4 | 51 | |
5d398779 ON |
52 | #include <linux/usb/quirks.h> |
53 | ||
1da177e4 | 54 | #include <scsi/scsi.h> |
dff6de73 | 55 | #include <scsi/scsi_eh.h> |
1da177e4 LT |
56 | #include <scsi/scsi_device.h> |
57 | ||
58 | #include "usb.h" | |
59 | #include "transport.h" | |
60 | #include "protocol.h" | |
61 | #include "scsiglue.h" | |
62 | #include "debug.h" | |
63 | ||
25ff1c31 AS |
64 | #include <linux/blkdev.h> |
65 | #include "../../scsi/sd.h" | |
66 | ||
1da177e4 LT |
67 | |
68 | /*********************************************************************** | |
69 | * Data transfer routines | |
70 | ***********************************************************************/ | |
71 | ||
72 | /* | |
73 | * This is subtle, so pay attention: | |
74 | * --------------------------------- | |
75 | * We're very concerned about races with a command abort. Hanging this code | |
76 | * is a sure fire way to hang the kernel. (Note that this discussion applies | |
77 | * only to transactions resulting from a scsi queued-command, since only | |
78 | * these transactions are subject to a scsi abort. Other transactions, such | |
79 | * as those occurring during device-specific initialization, must be handled | |
80 | * by a separate code path.) | |
81 | * | |
82 | * The abort function (usb_storage_command_abort() in scsiglue.c) first | |
7e4d6c38 | 83 | * sets the machine state and the ABORTING bit in us->dflags to prevent |
1da177e4 | 84 | * new URBs from being submitted. It then calls usb_stor_stop_transport() |
7e4d6c38 | 85 | * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags |
1da177e4 LT |
86 | * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE |
87 | * bit is tested to see if the current_sg scatter-gather request needs to be | |
88 | * stopped. The timeout callback routine does much the same thing. | |
89 | * | |
7e4d6c38 | 90 | * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to |
1da177e4 LT |
91 | * prevent new URBs from being submitted, and usb_stor_stop_transport() is |
92 | * called to stop any ongoing requests. | |
93 | * | |
94 | * The submit function first verifies that the submitting is allowed | |
95 | * (neither ABORTING nor DISCONNECTING bits are set) and that the submit | |
96 | * completes without errors, and only then sets the URB_ACTIVE bit. This | |
97 | * prevents the stop_transport() function from trying to cancel the URB | |
98 | * while the submit call is underway. Next, the submit function must test | |
99 | * the flags to see if an abort or disconnect occurred during the submission | |
100 | * or before the URB_ACTIVE bit was set. If so, it's essential to cancel | |
101 | * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit | |
102 | * is still set). Either way, the function must then wait for the URB to | |
b375a049 AS |
103 | * finish. Note that the URB can still be in progress even after a call to |
104 | * usb_unlink_urb() returns. | |
1da177e4 LT |
105 | * |
106 | * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, | |
107 | * either the stop_transport() function or the submitting function | |
108 | * is guaranteed to call usb_unlink_urb() for an active URB, | |
109 | * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being | |
110 | * called more than once or from being called during usb_submit_urb(). | |
111 | */ | |
112 | ||
f0183a33 FB |
113 | /* |
114 | * This is the completion handler which will wake us up when an URB | |
1da177e4 LT |
115 | * completes. |
116 | */ | |
7d12e780 | 117 | static void usb_stor_blocking_completion(struct urb *urb) |
1da177e4 | 118 | { |
cdc97792 | 119 | struct completion *urb_done_ptr = urb->context; |
1da177e4 LT |
120 | |
121 | complete(urb_done_ptr); | |
122 | } | |
1da177e4 | 123 | |
f0183a33 FB |
124 | /* |
125 | * This is the common part of the URB message submission code | |
1da177e4 LT |
126 | * |
127 | * All URBs from the usb-storage driver involved in handling a queued scsi | |
128 | * command _must_ pass through this function (or something like it) for the | |
129 | * abort mechanisms to work properly. | |
130 | */ | |
131 | static int usb_stor_msg_common(struct us_data *us, int timeout) | |
132 | { | |
133 | struct completion urb_done; | |
3428cc43 | 134 | long timeleft; |
1da177e4 LT |
135 | int status; |
136 | ||
543f7810 AS |
137 | /* don't submit URBs during abort processing */ |
138 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
139 | return -EIO; |
140 | ||
141 | /* set up data structures for the wakeup system */ | |
142 | init_completion(&urb_done); | |
143 | ||
144 | /* fill the common fields in the URB */ | |
145 | us->current_urb->context = &urb_done; | |
c222fb2e | 146 | us->current_urb->transfer_flags = 0; |
1da177e4 | 147 | |
f0183a33 FB |
148 | /* |
149 | * we assume that if transfer_buffer isn't us->iobuf then it | |
1da177e4 LT |
150 | * hasn't been mapped for DMA. Yes, this is clunky, but it's |
151 | * easier than always having the caller tell us whether the | |
f0183a33 FB |
152 | * transfer buffer has already been mapped. |
153 | */ | |
1da177e4 LT |
154 | if (us->current_urb->transfer_buffer == us->iobuf) |
155 | us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
156 | us->current_urb->transfer_dma = us->iobuf_dma; | |
1da177e4 LT |
157 | |
158 | /* submit the URB */ | |
159 | status = usb_submit_urb(us->current_urb, GFP_NOIO); | |
160 | if (status) { | |
161 | /* something went wrong */ | |
162 | return status; | |
163 | } | |
164 | ||
f0183a33 FB |
165 | /* |
166 | * since the URB has been submitted successfully, it's now okay | |
167 | * to cancel it | |
168 | */ | |
7e4d6c38 | 169 | set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
1da177e4 | 170 | |
543f7810 AS |
171 | /* did an abort occur during the submission? */ |
172 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
173 | |
174 | /* cancel the URB, if it hasn't been cancelled already */ | |
7e4d6c38 | 175 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 176 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
177 | usb_unlink_urb(us->current_urb); |
178 | } | |
179 | } | |
180 | ||
1da177e4 | 181 | /* wait for the completion of the URB */ |
3428cc43 FBH |
182 | timeleft = wait_for_completion_interruptible_timeout( |
183 | &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); | |
1da177e4 | 184 | |
7e4d6c38 | 185 | clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
3428cc43 FBH |
186 | |
187 | if (timeleft <= 0) { | |
191648d0 JP |
188 | usb_stor_dbg(us, "%s -- cancelling URB\n", |
189 | timeleft == 0 ? "Timeout" : "Signal"); | |
d6b7d3b6 | 190 | usb_kill_urb(us->current_urb); |
3428cc43 | 191 | } |
1da177e4 LT |
192 | |
193 | /* return the URB status */ | |
194 | return us->current_urb->status; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Transfer one control message, with timeouts, and allowing early | |
199 | * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. | |
200 | */ | |
201 | int usb_stor_control_msg(struct us_data *us, unsigned int pipe, | |
202 | u8 request, u8 requesttype, u16 value, u16 index, | |
203 | void *data, u16 size, int timeout) | |
204 | { | |
205 | int status; | |
206 | ||
191648d0 JP |
207 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
208 | request, requesttype, value, index, size); | |
1da177e4 LT |
209 | |
210 | /* fill in the devrequest structure */ | |
211 | us->cr->bRequestType = requesttype; | |
212 | us->cr->bRequest = request; | |
213 | us->cr->wValue = cpu_to_le16(value); | |
214 | us->cr->wIndex = cpu_to_le16(index); | |
215 | us->cr->wLength = cpu_to_le16(size); | |
216 | ||
217 | /* fill and submit the URB */ | |
218 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
219 | (unsigned char*) us->cr, data, size, | |
220 | usb_stor_blocking_completion, NULL); | |
221 | status = usb_stor_msg_common(us, timeout); | |
222 | ||
223 | /* return the actual length of the data transferred if no error */ | |
224 | if (status == 0) | |
225 | status = us->current_urb->actual_length; | |
226 | return status; | |
227 | } | |
e6e244b6 | 228 | EXPORT_SYMBOL_GPL(usb_stor_control_msg); |
1da177e4 | 229 | |
f0183a33 FB |
230 | /* |
231 | * This is a version of usb_clear_halt() that allows early termination and | |
1da177e4 LT |
232 | * doesn't read the status from the device -- this is because some devices |
233 | * crash their internal firmware when the status is requested after a halt. | |
234 | * | |
235 | * A definitive list of these 'bad' devices is too difficult to maintain or | |
236 | * make complete enough to be useful. This problem was first observed on the | |
237 | * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither | |
238 | * MacOS nor Windows checks the status after clearing a halt. | |
239 | * | |
240 | * Since many vendors in this space limit their testing to interoperability | |
241 | * with these two OSes, specification violations like this one are common. | |
242 | */ | |
243 | int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) | |
244 | { | |
245 | int result; | |
246 | int endp = usb_pipeendpoint(pipe); | |
247 | ||
248 | if (usb_pipein (pipe)) | |
249 | endp |= USB_DIR_IN; | |
250 | ||
251 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, | |
252 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, | |
253 | USB_ENDPOINT_HALT, endp, | |
254 | NULL, 0, 3*HZ); | |
255 | ||
5203ad44 | 256 | if (result >= 0) |
3444b26a | 257 | usb_reset_endpoint(us->pusb_dev, endp); |
1da177e4 | 258 | |
191648d0 | 259 | usb_stor_dbg(us, "result = %d\n", result); |
1da177e4 LT |
260 | return result; |
261 | } | |
e6e244b6 | 262 | EXPORT_SYMBOL_GPL(usb_stor_clear_halt); |
1da177e4 LT |
263 | |
264 | ||
265 | /* | |
266 | * Interpret the results of a URB transfer | |
267 | * | |
268 | * This function prints appropriate debugging messages, clears halts on | |
269 | * non-control endpoints, and translates the status to the corresponding | |
270 | * USB_STOR_XFER_xxx return code. | |
271 | */ | |
272 | static int interpret_urb_result(struct us_data *us, unsigned int pipe, | |
273 | unsigned int length, int result, unsigned int partial) | |
274 | { | |
191648d0 JP |
275 | usb_stor_dbg(us, "Status code %d; transferred %u/%u\n", |
276 | result, partial, length); | |
1da177e4 LT |
277 | switch (result) { |
278 | ||
279 | /* no error code; did we send all the data? */ | |
280 | case 0: | |
281 | if (partial != length) { | |
191648d0 | 282 | usb_stor_dbg(us, "-- short transfer\n"); |
1da177e4 LT |
283 | return USB_STOR_XFER_SHORT; |
284 | } | |
285 | ||
191648d0 | 286 | usb_stor_dbg(us, "-- transfer complete\n"); |
1da177e4 LT |
287 | return USB_STOR_XFER_GOOD; |
288 | ||
289 | /* stalled */ | |
290 | case -EPIPE: | |
f0183a33 FB |
291 | /* |
292 | * for control endpoints, (used by CB[I]) a stall indicates | |
293 | * a failed command | |
294 | */ | |
1da177e4 | 295 | if (usb_pipecontrol(pipe)) { |
191648d0 | 296 | usb_stor_dbg(us, "-- stall on control pipe\n"); |
1da177e4 LT |
297 | return USB_STOR_XFER_STALLED; |
298 | } | |
299 | ||
300 | /* for other sorts of endpoint, clear the stall */ | |
191648d0 JP |
301 | usb_stor_dbg(us, "clearing endpoint halt for pipe 0x%x\n", |
302 | pipe); | |
1da177e4 LT |
303 | if (usb_stor_clear_halt(us, pipe) < 0) |
304 | return USB_STOR_XFER_ERROR; | |
305 | return USB_STOR_XFER_STALLED; | |
306 | ||
1da177e4 LT |
307 | /* babble - the device tried to send more than we wanted to read */ |
308 | case -EOVERFLOW: | |
191648d0 | 309 | usb_stor_dbg(us, "-- babble\n"); |
1da177e4 LT |
310 | return USB_STOR_XFER_LONG; |
311 | ||
312 | /* the transfer was cancelled by abort, disconnect, or timeout */ | |
313 | case -ECONNRESET: | |
191648d0 | 314 | usb_stor_dbg(us, "-- transfer cancelled\n"); |
1da177e4 LT |
315 | return USB_STOR_XFER_ERROR; |
316 | ||
317 | /* short scatter-gather read transfer */ | |
318 | case -EREMOTEIO: | |
191648d0 | 319 | usb_stor_dbg(us, "-- short read transfer\n"); |
1da177e4 LT |
320 | return USB_STOR_XFER_SHORT; |
321 | ||
322 | /* abort or disconnect in progress */ | |
323 | case -EIO: | |
191648d0 | 324 | usb_stor_dbg(us, "-- abort or disconnect in progress\n"); |
1da177e4 LT |
325 | return USB_STOR_XFER_ERROR; |
326 | ||
327 | /* the catch-all error case */ | |
328 | default: | |
191648d0 | 329 | usb_stor_dbg(us, "-- unknown error\n"); |
1da177e4 LT |
330 | return USB_STOR_XFER_ERROR; |
331 | } | |
332 | } | |
333 | ||
334 | /* | |
335 | * Transfer one control message, without timeouts, but allowing early | |
336 | * termination. Return codes are USB_STOR_XFER_xxx. | |
337 | */ | |
338 | int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, | |
339 | u8 request, u8 requesttype, u16 value, u16 index, | |
340 | void *data, u16 size) | |
341 | { | |
342 | int result; | |
343 | ||
191648d0 JP |
344 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
345 | request, requesttype, value, index, size); | |
1da177e4 LT |
346 | |
347 | /* fill in the devrequest structure */ | |
348 | us->cr->bRequestType = requesttype; | |
349 | us->cr->bRequest = request; | |
350 | us->cr->wValue = cpu_to_le16(value); | |
351 | us->cr->wIndex = cpu_to_le16(index); | |
352 | us->cr->wLength = cpu_to_le16(size); | |
353 | ||
354 | /* fill and submit the URB */ | |
355 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
356 | (unsigned char*) us->cr, data, size, | |
357 | usb_stor_blocking_completion, NULL); | |
358 | result = usb_stor_msg_common(us, 0); | |
359 | ||
360 | return interpret_urb_result(us, pipe, size, result, | |
361 | us->current_urb->actual_length); | |
362 | } | |
e6e244b6 | 363 | EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); |
1da177e4 LT |
364 | |
365 | /* | |
366 | * Receive one interrupt buffer, without timeouts, but allowing early | |
367 | * termination. Return codes are USB_STOR_XFER_xxx. | |
368 | * | |
369 | * This routine always uses us->recv_intr_pipe as the pipe and | |
370 | * us->ep_bInterval as the interrupt interval. | |
371 | */ | |
372 | static int usb_stor_intr_transfer(struct us_data *us, void *buf, | |
373 | unsigned int length) | |
374 | { | |
375 | int result; | |
376 | unsigned int pipe = us->recv_intr_pipe; | |
377 | unsigned int maxp; | |
378 | ||
191648d0 | 379 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
380 | |
381 | /* calculate the max packet size */ | |
382 | maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe)); | |
383 | if (maxp > length) | |
384 | maxp = length; | |
385 | ||
386 | /* fill and submit the URB */ | |
387 | usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, | |
388 | maxp, usb_stor_blocking_completion, NULL, | |
389 | us->ep_bInterval); | |
390 | result = usb_stor_msg_common(us, 0); | |
391 | ||
392 | return interpret_urb_result(us, pipe, length, result, | |
393 | us->current_urb->actual_length); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Transfer one buffer via bulk pipe, without timeouts, but allowing early | |
398 | * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe | |
399 | * stalls during the transfer, the halt is automatically cleared. | |
400 | */ | |
401 | int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, | |
402 | void *buf, unsigned int length, unsigned int *act_len) | |
403 | { | |
404 | int result; | |
405 | ||
191648d0 | 406 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
407 | |
408 | /* fill and submit the URB */ | |
409 | usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, | |
410 | usb_stor_blocking_completion, NULL); | |
411 | result = usb_stor_msg_common(us, 0); | |
412 | ||
413 | /* store the actual length of the data transferred */ | |
414 | if (act_len) | |
415 | *act_len = us->current_urb->actual_length; | |
416 | return interpret_urb_result(us, pipe, length, result, | |
417 | us->current_urb->actual_length); | |
418 | } | |
e6e244b6 | 419 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); |
1da177e4 LT |
420 | |
421 | /* | |
422 | * Transfer a scatter-gather list via bulk transfer | |
423 | * | |
424 | * This function does basically the same thing as usb_stor_bulk_transfer_buf() | |
425 | * above, but it uses the usbcore scatter-gather library. | |
426 | */ | |
427 | static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe, | |
428 | struct scatterlist *sg, int num_sg, unsigned int length, | |
429 | unsigned int *act_len) | |
430 | { | |
431 | int result; | |
432 | ||
543f7810 AS |
433 | /* don't submit s-g requests during abort processing */ |
434 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
435 | return USB_STOR_XFER_ERROR; |
436 | ||
437 | /* initialize the scatter-gather request block */ | |
191648d0 | 438 | usb_stor_dbg(us, "xfer %u bytes, %d entries\n", length, num_sg); |
1da177e4 | 439 | result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, |
55acbda0 | 440 | sg, num_sg, length, GFP_NOIO); |
1da177e4 | 441 | if (result) { |
191648d0 | 442 | usb_stor_dbg(us, "usb_sg_init returned %d\n", result); |
1da177e4 LT |
443 | return USB_STOR_XFER_ERROR; |
444 | } | |
445 | ||
f0183a33 FB |
446 | /* |
447 | * since the block has been initialized successfully, it's now | |
448 | * okay to cancel it | |
449 | */ | |
7e4d6c38 | 450 | set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 | 451 | |
543f7810 AS |
452 | /* did an abort occur during the submission? */ |
453 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
454 | |
455 | /* cancel the request, if it hasn't been cancelled already */ | |
7e4d6c38 | 456 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 457 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
458 | usb_sg_cancel(&us->current_sg); |
459 | } | |
460 | } | |
461 | ||
462 | /* wait for the completion of the transfer */ | |
463 | usb_sg_wait(&us->current_sg); | |
7e4d6c38 | 464 | clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 LT |
465 | |
466 | result = us->current_sg.status; | |
467 | if (act_len) | |
468 | *act_len = us->current_sg.bytes; | |
469 | return interpret_urb_result(us, pipe, length, result, | |
470 | us->current_sg.bytes); | |
471 | } | |
472 | ||
6d416e61 BH |
473 | /* |
474 | * Common used function. Transfer a complete command | |
475 | * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid | |
476 | */ | |
477 | int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, | |
478 | struct scsi_cmnd* srb) | |
479 | { | |
480 | unsigned int partial; | |
481 | int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb), | |
482 | scsi_sg_count(srb), scsi_bufflen(srb), | |
483 | &partial); | |
484 | ||
485 | scsi_set_resid(srb, scsi_bufflen(srb) - partial); | |
486 | return result; | |
487 | } | |
e6e244b6 | 488 | EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); |
6d416e61 | 489 | |
1da177e4 LT |
490 | /* |
491 | * Transfer an entire SCSI command's worth of data payload over the bulk | |
492 | * pipe. | |
493 | * | |
494 | * Note that this uses usb_stor_bulk_transfer_buf() and | |
495 | * usb_stor_bulk_transfer_sglist() to achieve its goals -- | |
496 | * this function simply determines whether we're going to use | |
497 | * scatter-gather or not, and acts appropriately. | |
498 | */ | |
499 | int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe, | |
500 | void *buf, unsigned int length_left, int use_sg, int *residual) | |
501 | { | |
502 | int result; | |
503 | unsigned int partial; | |
504 | ||
505 | /* are we scatter-gathering? */ | |
506 | if (use_sg) { | |
507 | /* use the usb core scatter-gather primitives */ | |
508 | result = usb_stor_bulk_transfer_sglist(us, pipe, | |
509 | (struct scatterlist *) buf, use_sg, | |
510 | length_left, &partial); | |
511 | length_left -= partial; | |
512 | } else { | |
513 | /* no scatter-gather, just make the request */ | |
514 | result = usb_stor_bulk_transfer_buf(us, pipe, buf, | |
515 | length_left, &partial); | |
516 | length_left -= partial; | |
517 | } | |
518 | ||
519 | /* store the residual and return the error code */ | |
520 | if (residual) | |
521 | *residual = length_left; | |
522 | return result; | |
523 | } | |
e6e244b6 | 524 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); |
1da177e4 LT |
525 | |
526 | /*********************************************************************** | |
527 | * Transport routines | |
528 | ***********************************************************************/ | |
529 | ||
f0183a33 FB |
530 | /* |
531 | * There are so many devices that report the capacity incorrectly, | |
25ff1c31 AS |
532 | * this routine was written to counteract some of the resulting |
533 | * problems. | |
534 | */ | |
535 | static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) | |
536 | { | |
537 | struct gendisk *disk; | |
538 | struct scsi_disk *sdkp; | |
539 | u32 sector; | |
540 | ||
541 | /* To Report "Medium Error: Record Not Found */ | |
542 | static unsigned char record_not_found[18] = { | |
543 | [0] = 0x70, /* current error */ | |
544 | [2] = MEDIUM_ERROR, /* = 0x03 */ | |
545 | [7] = 0x0a, /* additional length */ | |
546 | [12] = 0x14 /* Record Not Found */ | |
547 | }; | |
548 | ||
f0183a33 FB |
549 | /* |
550 | * If last-sector problems can't occur, whether because the | |
25ff1c31 AS |
551 | * capacity was already decremented or because the device is |
552 | * known to report the correct capacity, then we don't need | |
553 | * to do anything. | |
554 | */ | |
555 | if (!us->use_last_sector_hacks) | |
556 | return; | |
557 | ||
558 | /* Was this command a READ(10) or a WRITE(10)? */ | |
559 | if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) | |
560 | goto done; | |
561 | ||
562 | /* Did this command access the last sector? */ | |
563 | sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) | | |
564 | (srb->cmnd[4] << 8) | (srb->cmnd[5]); | |
565 | disk = srb->request->rq_disk; | |
566 | if (!disk) | |
567 | goto done; | |
568 | sdkp = scsi_disk(disk); | |
569 | if (!sdkp) | |
570 | goto done; | |
571 | if (sector + 1 != sdkp->capacity) | |
572 | goto done; | |
573 | ||
574 | if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { | |
575 | ||
f0183a33 FB |
576 | /* |
577 | * The command succeeded. We know this device doesn't | |
0d020aae | 578 | * have the last-sector bug, so stop checking it. |
25ff1c31 | 579 | */ |
0d020aae | 580 | us->use_last_sector_hacks = 0; |
25ff1c31 AS |
581 | |
582 | } else { | |
f0183a33 FB |
583 | /* |
584 | * The command failed. Allow up to 3 retries in case this | |
25ff1c31 AS |
585 | * is some normal sort of failure. After that, assume the |
586 | * capacity is wrong and we're trying to access the sector | |
587 | * beyond the end. Replace the result code and sense data | |
588 | * with values that will cause the SCSI core to fail the | |
589 | * command immediately, instead of going into an infinite | |
590 | * (or even just a very long) retry loop. | |
591 | */ | |
592 | if (++us->last_sector_retries < 3) | |
593 | return; | |
594 | srb->result = SAM_STAT_CHECK_CONDITION; | |
595 | memcpy(srb->sense_buffer, record_not_found, | |
596 | sizeof(record_not_found)); | |
25ff1c31 AS |
597 | } |
598 | ||
599 | done: | |
f0183a33 FB |
600 | /* |
601 | * Don't reset the retry counter for TEST UNIT READY commands, | |
25ff1c31 AS |
602 | * because they get issued after device resets which might be |
603 | * caused by a failed last-sector access. | |
604 | */ | |
605 | if (srb->cmnd[0] != TEST_UNIT_READY) | |
606 | us->last_sector_retries = 0; | |
607 | } | |
608 | ||
f0183a33 FB |
609 | /* |
610 | * Invoke the transport and basic error-handling/recovery methods | |
1da177e4 LT |
611 | * |
612 | * This is used by the protocol layers to actually send the message to | |
613 | * the device and receive the response. | |
614 | */ | |
615 | void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) | |
616 | { | |
617 | int need_auto_sense; | |
618 | int result; | |
619 | ||
620 | /* send the command to the transport layer */ | |
6d416e61 | 621 | scsi_set_resid(srb, 0); |
1da177e4 LT |
622 | result = us->transport(srb, us); |
623 | ||
f0183a33 FB |
624 | /* |
625 | * if the command gets aborted by the higher layers, we need to | |
1da177e4 LT |
626 | * short-circuit all other processing |
627 | */ | |
7e4d6c38 | 628 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 629 | usb_stor_dbg(us, "-- command was aborted\n"); |
4d07ef76 MD |
630 | srb->result = DID_ABORT << 16; |
631 | goto Handle_Errors; | |
1da177e4 LT |
632 | } |
633 | ||
634 | /* if there is a transport error, reset and don't auto-sense */ | |
635 | if (result == USB_STOR_TRANSPORT_ERROR) { | |
191648d0 | 636 | usb_stor_dbg(us, "-- transport indicates error, resetting\n"); |
1da177e4 | 637 | srb->result = DID_ERROR << 16; |
4d07ef76 | 638 | goto Handle_Errors; |
1da177e4 LT |
639 | } |
640 | ||
641 | /* if the transport provided its own sense data, don't auto-sense */ | |
642 | if (result == USB_STOR_TRANSPORT_NO_SENSE) { | |
643 | srb->result = SAM_STAT_CHECK_CONDITION; | |
25ff1c31 | 644 | last_sector_hacks(us, srb); |
1da177e4 LT |
645 | return; |
646 | } | |
647 | ||
648 | srb->result = SAM_STAT_GOOD; | |
649 | ||
f0183a33 FB |
650 | /* |
651 | * Determine if we need to auto-sense | |
1da177e4 LT |
652 | * |
653 | * I normally don't use a flag like this, but it's almost impossible | |
654 | * to understand what's going on here if I don't. | |
655 | */ | |
656 | need_auto_sense = 0; | |
657 | ||
658 | /* | |
659 | * If we're running the CB transport, which is incapable | |
660 | * of determining status on its own, we will auto-sense | |
661 | * unless the operation involved a data-in transfer. Devices | |
662 | * can signal most data-in errors by stalling the bulk-in pipe. | |
663 | */ | |
8fa7fd74 | 664 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && |
1da177e4 | 665 | srb->sc_data_direction != DMA_FROM_DEVICE) { |
191648d0 | 666 | usb_stor_dbg(us, "-- CB transport device requiring auto-sense\n"); |
1da177e4 LT |
667 | need_auto_sense = 1; |
668 | } | |
669 | ||
670 | /* | |
671 | * If we have a failure, we're going to do a REQUEST_SENSE | |
672 | * automatically. Note that we differentiate between a command | |
673 | * "failure" and an "error" in the transport mechanism. | |
674 | */ | |
675 | if (result == USB_STOR_TRANSPORT_FAILED) { | |
191648d0 | 676 | usb_stor_dbg(us, "-- transport indicates command failure\n"); |
1da177e4 LT |
677 | need_auto_sense = 1; |
678 | } | |
679 | ||
1537e0ad BE |
680 | /* |
681 | * Determine if this device is SAT by seeing if the | |
682 | * command executed successfully. Otherwise we'll have | |
683 | * to wait for at least one CHECK_CONDITION to determine | |
684 | * SANE_SENSE support | |
685 | */ | |
a0bb1081 | 686 | if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && |
1537e0ad BE |
687 | result == USB_STOR_TRANSPORT_GOOD && |
688 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 AS |
689 | !(us->fflags & US_FL_BAD_SENSE) && |
690 | !(srb->cmnd[2] & 0x20))) { | |
191648d0 | 691 | usb_stor_dbg(us, "-- SAT supported, increasing auto-sense\n"); |
1537e0ad BE |
692 | us->fflags |= US_FL_SANE_SENSE; |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * A short transfer on a command where we don't expect it | |
697 | * is unusual, but it doesn't mean we need to auto-sense. | |
698 | */ | |
6d416e61 | 699 | if ((scsi_get_resid(srb) > 0) && |
1da177e4 LT |
700 | !((srb->cmnd[0] == REQUEST_SENSE) || |
701 | (srb->cmnd[0] == INQUIRY) || | |
702 | (srb->cmnd[0] == MODE_SENSE) || | |
703 | (srb->cmnd[0] == LOG_SENSE) || | |
704 | (srb->cmnd[0] == MODE_SENSE_10))) { | |
191648d0 | 705 | usb_stor_dbg(us, "-- unexpectedly short transfer\n"); |
1da177e4 LT |
706 | } |
707 | ||
708 | /* Now, if we need to do the auto-sense, let's do it */ | |
709 | if (need_auto_sense) { | |
710 | int temp_result; | |
dff6de73 | 711 | struct scsi_eh_save ses; |
1537e0ad | 712 | int sense_size = US_SENSE_SIZE; |
e16da02f LT |
713 | struct scsi_sense_hdr sshdr; |
714 | const u8 *scdd; | |
715 | u8 fm_ili; | |
1537e0ad BE |
716 | |
717 | /* device supports and needs bigger sense buffer */ | |
718 | if (us->fflags & US_FL_SANE_SENSE) | |
719 | sense_size = ~0; | |
b8430e1b | 720 | Retry_Sense: |
191648d0 | 721 | usb_stor_dbg(us, "Issuing auto-REQUEST_SENSE\n"); |
1da177e4 | 722 | |
1537e0ad | 723 | scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); |
1da177e4 LT |
724 | |
725 | /* FIXME: we must do the protocol translation here */ | |
8fa7fd74 MN |
726 | if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || |
727 | us->subclass == USB_SC_CYP_ATACB) | |
1da177e4 LT |
728 | srb->cmd_len = 6; |
729 | else | |
730 | srb->cmd_len = 12; | |
731 | ||
1da177e4 | 732 | /* issue the auto-sense command */ |
6d416e61 | 733 | scsi_set_resid(srb, 0); |
1da177e4 LT |
734 | temp_result = us->transport(us->srb, us); |
735 | ||
736 | /* let's clean up right away */ | |
dff6de73 | 737 | scsi_eh_restore_cmnd(srb, &ses); |
1da177e4 | 738 | |
7e4d6c38 | 739 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 740 | usb_stor_dbg(us, "-- auto-sense aborted\n"); |
4d07ef76 | 741 | srb->result = DID_ABORT << 16; |
a0bb1081 AS |
742 | |
743 | /* If SANE_SENSE caused this problem, disable it */ | |
744 | if (sense_size != US_SENSE_SIZE) { | |
745 | us->fflags &= ~US_FL_SANE_SENSE; | |
746 | us->fflags |= US_FL_BAD_SENSE; | |
747 | } | |
4d07ef76 | 748 | goto Handle_Errors; |
1da177e4 | 749 | } |
b8430e1b | 750 | |
f0183a33 FB |
751 | /* |
752 | * Some devices claim to support larger sense but fail when | |
b8430e1b BH |
753 | * trying to request it. When a transport failure happens |
754 | * using US_FS_SANE_SENSE, we always retry with a standard | |
755 | * (small) sense request. This fixes some USB GSM modems | |
756 | */ | |
757 | if (temp_result == USB_STOR_TRANSPORT_FAILED && | |
a0bb1081 | 758 | sense_size != US_SENSE_SIZE) { |
191648d0 | 759 | usb_stor_dbg(us, "-- auto-sense failure, retry small sense\n"); |
b8430e1b | 760 | sense_size = US_SENSE_SIZE; |
a0bb1081 AS |
761 | us->fflags &= ~US_FL_SANE_SENSE; |
762 | us->fflags |= US_FL_BAD_SENSE; | |
b8430e1b BH |
763 | goto Retry_Sense; |
764 | } | |
765 | ||
766 | /* Other failures */ | |
1da177e4 | 767 | if (temp_result != USB_STOR_TRANSPORT_GOOD) { |
191648d0 | 768 | usb_stor_dbg(us, "-- auto-sense failure\n"); |
1da177e4 | 769 | |
f0183a33 FB |
770 | /* |
771 | * we skip the reset if this happens to be a | |
1da177e4 LT |
772 | * multi-target device, since failure of an |
773 | * auto-sense is perfectly valid | |
774 | */ | |
1da177e4 | 775 | srb->result = DID_ERROR << 16; |
7e4d6c38 | 776 | if (!(us->fflags & US_FL_SCM_MULT_TARG)) |
4d07ef76 | 777 | goto Handle_Errors; |
1da177e4 LT |
778 | return; |
779 | } | |
780 | ||
f0183a33 FB |
781 | /* |
782 | * If the sense data returned is larger than 18-bytes then we | |
1537e0ad BE |
783 | * assume this device supports requesting more in the future. |
784 | * The response code must be 70h through 73h inclusive. | |
785 | */ | |
786 | if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && | |
787 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 | 788 | !(us->fflags & US_FL_BAD_SENSE) && |
1537e0ad | 789 | (srb->sense_buffer[0] & 0x7C) == 0x70) { |
191648d0 | 790 | usb_stor_dbg(us, "-- SANE_SENSE support enabled\n"); |
1537e0ad BE |
791 | us->fflags |= US_FL_SANE_SENSE; |
792 | ||
f0183a33 FB |
793 | /* |
794 | * Indicate to the user that we truncated their sense | |
1537e0ad BE |
795 | * because we didn't know it supported larger sense. |
796 | */ | |
191648d0 JP |
797 | usb_stor_dbg(us, "-- Sense data truncated to %i from %i\n", |
798 | US_SENSE_SIZE, | |
799 | srb->sense_buffer[7] + 8); | |
1537e0ad BE |
800 | srb->sense_buffer[7] = (US_SENSE_SIZE - 8); |
801 | } | |
802 | ||
e16da02f LT |
803 | scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE, |
804 | &sshdr); | |
805 | ||
191648d0 JP |
806 | usb_stor_dbg(us, "-- Result from auto-sense is %d\n", |
807 | temp_result); | |
808 | usb_stor_dbg(us, "-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n", | |
809 | sshdr.response_code, sshdr.sense_key, | |
810 | sshdr.asc, sshdr.ascq); | |
1da177e4 | 811 | #ifdef CONFIG_USB_STORAGE_DEBUG |
191648d0 | 812 | usb_stor_show_sense(us, sshdr.sense_key, sshdr.asc, sshdr.ascq); |
1da177e4 LT |
813 | #endif |
814 | ||
815 | /* set the result so the higher layers expect this data */ | |
816 | srb->result = SAM_STAT_CHECK_CONDITION; | |
817 | ||
e16da02f LT |
818 | scdd = scsi_sense_desc_find(srb->sense_buffer, |
819 | SCSI_SENSE_BUFFERSIZE, 4); | |
820 | fm_ili = (scdd ? scdd[3] : srb->sense_buffer[2]) & 0xA0; | |
821 | ||
f0183a33 FB |
822 | /* |
823 | * We often get empty sense data. This could indicate that | |
f1a0743b AS |
824 | * everything worked or that there was an unspecified |
825 | * problem. We have to decide which. | |
826 | */ | |
e16da02f LT |
827 | if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 && |
828 | fm_ili == 0) { | |
f0183a33 FB |
829 | /* |
830 | * If things are really okay, then let's show that. | |
f1a0743b AS |
831 | * Zero out the sense buffer so the higher layers |
832 | * won't realize we did an unsolicited auto-sense. | |
833 | */ | |
834 | if (result == USB_STOR_TRANSPORT_GOOD) { | |
835 | srb->result = SAM_STAT_GOOD; | |
836 | srb->sense_buffer[0] = 0x0; | |
837 | ||
f0183a33 FB |
838 | /* |
839 | * If there was a problem, report an unspecified | |
f1a0743b AS |
840 | * hardware error to prevent the higher layers from |
841 | * entering an infinite retry loop. | |
842 | */ | |
843 | } else { | |
844 | srb->result = DID_ERROR << 16; | |
e16da02f LT |
845 | if ((sshdr.response_code & 0x72) == 0x72) |
846 | srb->sense_buffer[1] = HARDWARE_ERROR; | |
847 | else | |
848 | srb->sense_buffer[2] = HARDWARE_ERROR; | |
f1a0743b | 849 | } |
1da177e4 LT |
850 | } |
851 | } | |
852 | ||
21c13a4f AS |
853 | /* |
854 | * Some devices don't work or return incorrect data the first | |
855 | * time they get a READ(10) command, or for the first READ(10) | |
856 | * after a media change. If the INITIAL_READ10 flag is set, | |
857 | * keep track of whether READ(10) commands succeed. If the | |
858 | * previous one succeeded and this one failed, set the REDO_READ10 | |
859 | * flag to force a retry. | |
860 | */ | |
861 | if (unlikely((us->fflags & US_FL_INITIAL_READ10) && | |
862 | srb->cmnd[0] == READ_10)) { | |
863 | if (srb->result == SAM_STAT_GOOD) { | |
864 | set_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
865 | } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) { | |
866 | clear_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
867 | set_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
868 | } | |
869 | ||
870 | /* | |
871 | * Next, if the REDO_READ10 flag is set, return a result | |
872 | * code that will cause the SCSI core to retry the READ(10) | |
873 | * command immediately. | |
874 | */ | |
875 | if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) { | |
876 | clear_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
877 | srb->result = DID_IMM_RETRY << 16; | |
878 | srb->sense_buffer[0] = 0; | |
879 | } | |
880 | } | |
881 | ||
1da177e4 | 882 | /* Did we transfer less than the minimum amount required? */ |
8bfa2472 | 883 | if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && |
6d416e61 | 884 | scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) |
1c9fbafc | 885 | srb->result = DID_ERROR << 16; |
1da177e4 | 886 | |
25ff1c31 | 887 | last_sector_hacks(us, srb); |
1da177e4 LT |
888 | return; |
889 | ||
f0183a33 FB |
890 | /* |
891 | * Error and abort processing: try to resynchronize with the device | |
4d07ef76 | 892 | * by issuing a port reset. If that fails, try a class-specific |
f0183a33 FB |
893 | * device reset. |
894 | */ | |
4d07ef76 MD |
895 | Handle_Errors: |
896 | ||
f0183a33 FB |
897 | /* |
898 | * Set the RESETTING bit, and clear the ABORTING bit so that | |
899 | * the reset may proceed. | |
900 | */ | |
4d07ef76 | 901 | scsi_lock(us_to_host(us)); |
7e4d6c38 AS |
902 | set_bit(US_FLIDX_RESETTING, &us->dflags); |
903 | clear_bit(US_FLIDX_ABORTING, &us->dflags); | |
4d07ef76 MD |
904 | scsi_unlock(us_to_host(us)); |
905 | ||
f0183a33 FB |
906 | /* |
907 | * We must release the device lock because the pre_reset routine | |
908 | * will want to acquire it. | |
909 | */ | |
47104b0d | 910 | mutex_unlock(&us->dev_mutex); |
4d07ef76 | 911 | result = usb_stor_port_reset(us); |
47104b0d AS |
912 | mutex_lock(&us->dev_mutex); |
913 | ||
4d07ef76 MD |
914 | if (result < 0) { |
915 | scsi_lock(us_to_host(us)); | |
916 | usb_stor_report_device_reset(us); | |
917 | scsi_unlock(us_to_host(us)); | |
1da177e4 | 918 | us->transport_reset(us); |
4d07ef76 | 919 | } |
7e4d6c38 | 920 | clear_bit(US_FLIDX_RESETTING, &us->dflags); |
25ff1c31 | 921 | last_sector_hacks(us, srb); |
1da177e4 LT |
922 | } |
923 | ||
924 | /* Stop the current URB transfer */ | |
925 | void usb_stor_stop_transport(struct us_data *us) | |
926 | { | |
f0183a33 FB |
927 | /* |
928 | * If the state machine is blocked waiting for an URB, | |
1da177e4 LT |
929 | * let's wake it up. The test_and_clear_bit() call |
930 | * guarantees that if a URB has just been submitted, | |
f0183a33 FB |
931 | * it won't be cancelled more than once. |
932 | */ | |
7e4d6c38 | 933 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 934 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
935 | usb_unlink_urb(us->current_urb); |
936 | } | |
937 | ||
938 | /* If we are waiting for a scatter-gather operation, cancel it. */ | |
7e4d6c38 | 939 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 940 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
941 | usb_sg_cancel(&us->current_sg); |
942 | } | |
943 | } | |
944 | ||
945 | /* | |
64648a9d | 946 | * Control/Bulk and Control/Bulk/Interrupt transport |
1da177e4 LT |
947 | */ |
948 | ||
64648a9d | 949 | int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) |
1da177e4 | 950 | { |
6d416e61 | 951 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
952 | unsigned int pipe = 0; |
953 | int result; | |
954 | ||
955 | /* COMMAND STAGE */ | |
956 | /* let's send the command via the control pipe */ | |
957 | result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, | |
958 | US_CBI_ADSC, | |
959 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
960 | us->ifnum, srb->cmnd, srb->cmd_len); | |
961 | ||
962 | /* check the return code for the command */ | |
191648d0 JP |
963 | usb_stor_dbg(us, "Call to usb_stor_ctrl_transfer() returned %d\n", |
964 | result); | |
1da177e4 LT |
965 | |
966 | /* if we stalled the command, it means command failed */ | |
967 | if (result == USB_STOR_XFER_STALLED) { | |
968 | return USB_STOR_TRANSPORT_FAILED; | |
969 | } | |
970 | ||
971 | /* Uh oh... serious problem here */ | |
972 | if (result != USB_STOR_XFER_GOOD) { | |
973 | return USB_STOR_TRANSPORT_ERROR; | |
974 | } | |
975 | ||
976 | /* DATA STAGE */ | |
977 | /* transfer the data payload for this command, if one exists*/ | |
978 | if (transfer_length) { | |
979 | pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
980 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 981 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 982 | usb_stor_dbg(us, "CBI data stage result is 0x%x\n", result); |
1da177e4 LT |
983 | |
984 | /* if we stalled the data transfer it means command failed */ | |
985 | if (result == USB_STOR_XFER_STALLED) | |
986 | return USB_STOR_TRANSPORT_FAILED; | |
987 | if (result > USB_STOR_XFER_STALLED) | |
988 | return USB_STOR_TRANSPORT_ERROR; | |
989 | } | |
990 | ||
991 | /* STATUS STAGE */ | |
64648a9d | 992 | |
f0183a33 FB |
993 | /* |
994 | * NOTE: CB does not have a status stage. Silly, I know. So | |
64648a9d AS |
995 | * we have to catch this at a higher level. |
996 | */ | |
8fa7fd74 | 997 | if (us->protocol != USB_PR_CBI) |
64648a9d AS |
998 | return USB_STOR_TRANSPORT_GOOD; |
999 | ||
1da177e4 | 1000 | result = usb_stor_intr_transfer(us, us->iobuf, 2); |
191648d0 JP |
1001 | usb_stor_dbg(us, "Got interrupt data (0x%x, 0x%x)\n", |
1002 | us->iobuf[0], us->iobuf[1]); | |
1da177e4 LT |
1003 | if (result != USB_STOR_XFER_GOOD) |
1004 | return USB_STOR_TRANSPORT_ERROR; | |
1005 | ||
f0183a33 FB |
1006 | /* |
1007 | * UFI gives us ASC and ASCQ, like a request sense | |
1da177e4 LT |
1008 | * |
1009 | * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI | |
1010 | * devices, so we ignore the information for those commands. Note | |
1011 | * that this means we could be ignoring a real error on these | |
1012 | * commands, but that can't be helped. | |
1013 | */ | |
8fa7fd74 | 1014 | if (us->subclass == USB_SC_UFI) { |
1da177e4 LT |
1015 | if (srb->cmnd[0] == REQUEST_SENSE || |
1016 | srb->cmnd[0] == INQUIRY) | |
1017 | return USB_STOR_TRANSPORT_GOOD; | |
1018 | if (us->iobuf[0]) | |
1019 | goto Failed; | |
1020 | return USB_STOR_TRANSPORT_GOOD; | |
1021 | } | |
1022 | ||
f0183a33 FB |
1023 | /* |
1024 | * If not UFI, we interpret the data as a result code | |
1da177e4 LT |
1025 | * The first byte should always be a 0x0. |
1026 | * | |
1027 | * Some bogus devices don't follow that rule. They stuff the ASC | |
1028 | * into the first byte -- so if it's non-zero, call it a failure. | |
1029 | */ | |
1030 | if (us->iobuf[0]) { | |
191648d0 JP |
1031 | usb_stor_dbg(us, "CBI IRQ data showed reserved bType 0x%x\n", |
1032 | us->iobuf[0]); | |
1da177e4 LT |
1033 | goto Failed; |
1034 | ||
1035 | } | |
1036 | ||
1037 | /* The second byte & 0x0F should be 0x0 for good, otherwise error */ | |
1038 | switch (us->iobuf[1] & 0x0F) { | |
1039 | case 0x00: | |
1040 | return USB_STOR_TRANSPORT_GOOD; | |
1041 | case 0x01: | |
1042 | goto Failed; | |
1043 | } | |
1044 | return USB_STOR_TRANSPORT_ERROR; | |
1045 | ||
f0183a33 FB |
1046 | /* |
1047 | * the CBI spec requires that the bulk pipe must be cleared | |
1da177e4 LT |
1048 | * following any data-in/out command failure (section 2.4.3.1.3) |
1049 | */ | |
1050 | Failed: | |
1051 | if (pipe) | |
1052 | usb_stor_clear_halt(us, pipe); | |
1053 | return USB_STOR_TRANSPORT_FAILED; | |
1054 | } | |
e6e244b6 | 1055 | EXPORT_SYMBOL_GPL(usb_stor_CB_transport); |
1da177e4 | 1056 | |
1da177e4 LT |
1057 | /* |
1058 | * Bulk only transport | |
1059 | */ | |
1060 | ||
1061 | /* Determine what the maximum LUN supported is */ | |
1062 | int usb_stor_Bulk_max_lun(struct us_data *us) | |
1063 | { | |
1064 | int result; | |
1065 | ||
1066 | /* issue the command */ | |
b876aef7 | 1067 | us->iobuf[0] = 0; |
1da177e4 LT |
1068 | result = usb_stor_control_msg(us, us->recv_ctrl_pipe, |
1069 | US_BULK_GET_MAX_LUN, | |
1070 | USB_DIR_IN | USB_TYPE_CLASS | | |
1071 | USB_RECIP_INTERFACE, | |
7a777919 | 1072 | 0, us->ifnum, us->iobuf, 1, 10*HZ); |
1da177e4 | 1073 | |
191648d0 JP |
1074 | usb_stor_dbg(us, "GetMaxLUN command result is %d, data is %d\n", |
1075 | result, us->iobuf[0]); | |
1da177e4 | 1076 | |
55dc68c0 MK |
1077 | /* |
1078 | * If we have a successful request, return the result if valid. The | |
1079 | * CBW LUN field is 4 bits wide, so the value reported by the device | |
1080 | * should fit into that. | |
1081 | */ | |
1082 | if (result > 0) { | |
1083 | if (us->iobuf[0] < 16) { | |
1084 | return us->iobuf[0]; | |
1085 | } else { | |
1086 | dev_info(&us->pusb_intf->dev, | |
1087 | "Max LUN %d is not valid, using 0 instead", | |
1088 | us->iobuf[0]); | |
1089 | } | |
1090 | } | |
1da177e4 | 1091 | |
1da177e4 LT |
1092 | /* |
1093 | * Some devices don't like GetMaxLUN. They may STALL the control | |
1094 | * pipe, they may return a zero-length result, they may do nothing at | |
1095 | * all and timeout, or they may fail in even more bizarrely creative | |
1096 | * ways. In these cases the best approach is to use the default | |
1097 | * value: only one LUN. | |
1098 | */ | |
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) | |
1103 | { | |
1104 | struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; | |
1105 | struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; | |
6d416e61 | 1106 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
1107 | unsigned int residue; |
1108 | int result; | |
1109 | int fake_sense = 0; | |
1110 | unsigned int cswlen; | |
1111 | unsigned int cbwlen = US_BULK_CB_WRAP_LEN; | |
1112 | ||
1113 | /* Take care of BULK32 devices; set extra byte to 0 */ | |
7e4d6c38 | 1114 | if (unlikely(us->fflags & US_FL_BULK32)) { |
1da177e4 LT |
1115 | cbwlen = 32; |
1116 | us->iobuf[31] = 0; | |
1117 | } | |
1118 | ||
1119 | /* set up the command wrapper */ | |
1120 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1121 | bcb->DataTransferLength = cpu_to_le32(transfer_length); | |
b8db6d64 SAS |
1122 | bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? |
1123 | US_BULK_FLAG_IN : 0; | |
0f64e078 | 1124 | bcb->Tag = ++us->tag; |
1da177e4 | 1125 | bcb->Lun = srb->device->lun; |
7e4d6c38 | 1126 | if (us->fflags & US_FL_SCM_MULT_TARG) |
1da177e4 LT |
1127 | bcb->Lun |= srb->device->id << 4; |
1128 | bcb->Length = srb->cmd_len; | |
1129 | ||
1130 | /* copy the command payload */ | |
1131 | memset(bcb->CDB, 0, sizeof(bcb->CDB)); | |
1132 | memcpy(bcb->CDB, srb->cmnd, bcb->Length); | |
1133 | ||
1134 | /* send it to out endpoint */ | |
191648d0 JP |
1135 | usb_stor_dbg(us, "Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n", |
1136 | le32_to_cpu(bcb->Signature), bcb->Tag, | |
1137 | le32_to_cpu(bcb->DataTransferLength), bcb->Flags, | |
1138 | (bcb->Lun >> 4), (bcb->Lun & 0x0F), | |
1139 | bcb->Length); | |
1da177e4 LT |
1140 | result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, |
1141 | bcb, cbwlen, NULL); | |
191648d0 | 1142 | usb_stor_dbg(us, "Bulk command transfer result=%d\n", result); |
1da177e4 LT |
1143 | if (result != USB_STOR_XFER_GOOD) |
1144 | return USB_STOR_TRANSPORT_ERROR; | |
1145 | ||
1146 | /* DATA STAGE */ | |
1147 | /* send/receive data payload, if there is any */ | |
1148 | ||
f0183a33 FB |
1149 | /* |
1150 | * Some USB-IDE converter chips need a 100us delay between the | |
1da177e4 | 1151 | * command phase and the data phase. Some devices need a little |
f0183a33 FB |
1152 | * more than that, probably because of clock rate inaccuracies. |
1153 | */ | |
7e4d6c38 | 1154 | if (unlikely(us->fflags & US_FL_GO_SLOW)) |
e616b39a | 1155 | usleep_range(125, 150); |
1da177e4 LT |
1156 | |
1157 | if (transfer_length) { | |
1158 | unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
1159 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 1160 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 1161 | usb_stor_dbg(us, "Bulk data transfer result 0x%x\n", result); |
1da177e4 LT |
1162 | if (result == USB_STOR_XFER_ERROR) |
1163 | return USB_STOR_TRANSPORT_ERROR; | |
1164 | ||
f0183a33 FB |
1165 | /* |
1166 | * If the device tried to send back more data than the | |
1da177e4 LT |
1167 | * amount requested, the spec requires us to transfer |
1168 | * the CSW anyway. Since there's no point retrying the | |
1169 | * the command, we'll return fake sense data indicating | |
1170 | * Illegal Request, Invalid Field in CDB. | |
1171 | */ | |
1172 | if (result == USB_STOR_XFER_LONG) | |
1173 | fake_sense = 1; | |
93c9bf4d AS |
1174 | |
1175 | /* | |
1176 | * Sometimes a device will mistakenly skip the data phase | |
1177 | * and go directly to the status phase without sending a | |
1178 | * zero-length packet. If we get a 13-byte response here, | |
1179 | * check whether it really is a CSW. | |
1180 | */ | |
1181 | if (result == USB_STOR_XFER_SHORT && | |
1182 | srb->sc_data_direction == DMA_FROM_DEVICE && | |
1183 | transfer_length - scsi_get_resid(srb) == | |
1184 | US_BULK_CS_WRAP_LEN) { | |
1185 | struct scatterlist *sg = NULL; | |
1186 | unsigned int offset = 0; | |
1187 | ||
1188 | if (usb_stor_access_xfer_buf((unsigned char *) bcs, | |
1189 | US_BULK_CS_WRAP_LEN, srb, &sg, | |
1190 | &offset, FROM_XFER_BUF) == | |
1191 | US_BULK_CS_WRAP_LEN && | |
1192 | bcs->Signature == | |
1193 | cpu_to_le32(US_BULK_CS_SIGN)) { | |
1194 | usb_stor_dbg(us, "Device skipped data phase\n"); | |
1195 | scsi_set_resid(srb, transfer_length); | |
1196 | goto skipped_data_phase; | |
1197 | } | |
1198 | } | |
1da177e4 LT |
1199 | } |
1200 | ||
f0183a33 FB |
1201 | /* |
1202 | * See flow chart on pg 15 of the Bulk Only Transport spec for | |
1da177e4 LT |
1203 | * an explanation of how this code works. |
1204 | */ | |
1205 | ||
1206 | /* get CSW for device status */ | |
191648d0 | 1207 | usb_stor_dbg(us, "Attempting to get CSW...\n"); |
1da177e4 LT |
1208 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1209 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1210 | ||
f0183a33 FB |
1211 | /* |
1212 | * Some broken devices add unnecessary zero-length packets to the | |
1da177e4 LT |
1213 | * end of their data transfers. Such packets show up as 0-length |
1214 | * CSWs. If we encounter such a thing, try to read the CSW again. | |
1215 | */ | |
1216 | if (result == USB_STOR_XFER_SHORT && cswlen == 0) { | |
191648d0 | 1217 | usb_stor_dbg(us, "Received 0-length CSW; retrying...\n"); |
1da177e4 LT |
1218 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1219 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1220 | } | |
1221 | ||
1222 | /* did the attempt to read the CSW fail? */ | |
1223 | if (result == USB_STOR_XFER_STALLED) { | |
1224 | ||
1225 | /* get the status again */ | |
191648d0 | 1226 | usb_stor_dbg(us, "Attempting to get CSW (2nd try)...\n"); |
1da177e4 LT |
1227 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1228 | bcs, US_BULK_CS_WRAP_LEN, NULL); | |
1229 | } | |
1230 | ||
1231 | /* if we still have a failure at this point, we're in trouble */ | |
191648d0 | 1232 | usb_stor_dbg(us, "Bulk status result = %d\n", result); |
1da177e4 LT |
1233 | if (result != USB_STOR_XFER_GOOD) |
1234 | return USB_STOR_TRANSPORT_ERROR; | |
1235 | ||
93c9bf4d | 1236 | skipped_data_phase: |
1da177e4 LT |
1237 | /* check bulk status */ |
1238 | residue = le32_to_cpu(bcs->Residue); | |
191648d0 JP |
1239 | usb_stor_dbg(us, "Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", |
1240 | le32_to_cpu(bcs->Signature), bcs->Tag, | |
1241 | residue, bcs->Status); | |
7e4d6c38 | 1242 | if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || |
cc36bdd4 | 1243 | bcs->Status > US_BULK_STAT_PHASE) { |
191648d0 | 1244 | usb_stor_dbg(us, "Bulk logical error\n"); |
1da177e4 LT |
1245 | return USB_STOR_TRANSPORT_ERROR; |
1246 | } | |
1247 | ||
f0183a33 FB |
1248 | /* |
1249 | * Some broken devices report odd signatures, so we do not check them | |
1da177e4 LT |
1250 | * for validity against the spec. We store the first one we see, |
1251 | * and check subsequent transfers for validity against this signature. | |
1252 | */ | |
1253 | if (!us->bcs_signature) { | |
1254 | us->bcs_signature = bcs->Signature; | |
1255 | if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) | |
191648d0 JP |
1256 | usb_stor_dbg(us, "Learnt BCS signature 0x%08X\n", |
1257 | le32_to_cpu(us->bcs_signature)); | |
1da177e4 | 1258 | } else if (bcs->Signature != us->bcs_signature) { |
191648d0 JP |
1259 | usb_stor_dbg(us, "Signature mismatch: got %08X, expecting %08X\n", |
1260 | le32_to_cpu(bcs->Signature), | |
1261 | le32_to_cpu(us->bcs_signature)); | |
1da177e4 LT |
1262 | return USB_STOR_TRANSPORT_ERROR; |
1263 | } | |
1264 | ||
f0183a33 FB |
1265 | /* |
1266 | * try to compute the actual residue, based on how much data | |
1267 | * was really transferred and what the device tells us | |
1268 | */ | |
59f4ff2e AS |
1269 | if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { |
1270 | ||
f0183a33 FB |
1271 | /* |
1272 | * Heuristically detect devices that generate bogus residues | |
59f4ff2e AS |
1273 | * by seeing what happens with INQUIRY and READ CAPACITY |
1274 | * commands. | |
1275 | */ | |
1276 | if (bcs->Status == US_BULK_STAT_OK && | |
1277 | scsi_get_resid(srb) == 0 && | |
1278 | ((srb->cmnd[0] == INQUIRY && | |
1279 | transfer_length == 36) || | |
1280 | (srb->cmnd[0] == READ_CAPACITY && | |
1281 | transfer_length == 8))) { | |
1282 | us->fflags |= US_FL_IGNORE_RESIDUE; | |
1283 | ||
1284 | } else { | |
1da177e4 | 1285 | residue = min(residue, transfer_length); |
6d416e61 BH |
1286 | scsi_set_resid(srb, max(scsi_get_resid(srb), |
1287 | (int) residue)); | |
1da177e4 LT |
1288 | } |
1289 | } | |
1290 | ||
1291 | /* based on the status code, we report good or bad */ | |
1292 | switch (bcs->Status) { | |
1293 | case US_BULK_STAT_OK: | |
1294 | /* device babbled -- return fake sense data */ | |
1295 | if (fake_sense) { | |
1296 | memcpy(srb->sense_buffer, | |
1297 | usb_stor_sense_invalidCDB, | |
1298 | sizeof(usb_stor_sense_invalidCDB)); | |
1299 | return USB_STOR_TRANSPORT_NO_SENSE; | |
1300 | } | |
1301 | ||
1302 | /* command good -- note that data could be short */ | |
1303 | return USB_STOR_TRANSPORT_GOOD; | |
1304 | ||
1305 | case US_BULK_STAT_FAIL: | |
1306 | /* command failed */ | |
1307 | return USB_STOR_TRANSPORT_FAILED; | |
1308 | ||
1309 | case US_BULK_STAT_PHASE: | |
f0183a33 FB |
1310 | /* |
1311 | * phase error -- note that a transport reset will be | |
1da177e4 LT |
1312 | * invoked by the invoke_transport() function |
1313 | */ | |
1314 | return USB_STOR_TRANSPORT_ERROR; | |
1315 | } | |
1316 | ||
1317 | /* we should never get here, but if we do, we're in trouble */ | |
1318 | return USB_STOR_TRANSPORT_ERROR; | |
1319 | } | |
e6e244b6 | 1320 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); |
1da177e4 LT |
1321 | |
1322 | /*********************************************************************** | |
1323 | * Reset routines | |
1324 | ***********************************************************************/ | |
1325 | ||
f0183a33 FB |
1326 | /* |
1327 | * This is the common part of the device reset code. | |
1da177e4 LT |
1328 | * |
1329 | * It's handy that every transport mechanism uses the control endpoint for | |
1330 | * resets. | |
1331 | * | |
5203ad44 | 1332 | * Basically, we send a reset with a 5-second timeout, so we don't get |
1da177e4 LT |
1333 | * jammed attempting to do the reset. |
1334 | */ | |
1335 | static int usb_stor_reset_common(struct us_data *us, | |
1336 | u8 request, u8 requesttype, | |
1337 | u16 value, u16 index, void *data, u16 size) | |
1338 | { | |
1339 | int result; | |
1340 | int result2; | |
1da177e4 | 1341 | |
7e4d6c38 | 1342 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 1343 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 MD |
1344 | return -EIO; |
1345 | } | |
1da177e4 | 1346 | |
1da177e4 LT |
1347 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, |
1348 | request, requesttype, value, index, data, size, | |
5203ad44 | 1349 | 5*HZ); |
1da177e4 | 1350 | if (result < 0) { |
191648d0 | 1351 | usb_stor_dbg(us, "Soft reset failed: %d\n", result); |
4d07ef76 | 1352 | return result; |
1da177e4 LT |
1353 | } |
1354 | ||
f0183a33 FB |
1355 | /* |
1356 | * Give the device some time to recover from the reset, | |
1357 | * but don't delay disconnect processing. | |
1358 | */ | |
7e4d6c38 AS |
1359 | wait_event_interruptible_timeout(us->delay_wait, |
1360 | test_bit(US_FLIDX_DISCONNECTING, &us->dflags), | |
1361 | HZ*6); | |
1362 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { | |
191648d0 | 1363 | usb_stor_dbg(us, "Reset interrupted by disconnect\n"); |
4d07ef76 | 1364 | return -EIO; |
1da177e4 LT |
1365 | } |
1366 | ||
191648d0 | 1367 | usb_stor_dbg(us, "Soft reset: clearing bulk-in endpoint halt\n"); |
1da177e4 LT |
1368 | result = usb_stor_clear_halt(us, us->recv_bulk_pipe); |
1369 | ||
191648d0 | 1370 | usb_stor_dbg(us, "Soft reset: clearing bulk-out endpoint halt\n"); |
1da177e4 LT |
1371 | result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); |
1372 | ||
5203ad44 MD |
1373 | /* return a result code based on the result of the clear-halts */ |
1374 | if (result >= 0) | |
1375 | result = result2; | |
4d07ef76 | 1376 | if (result < 0) |
191648d0 | 1377 | usb_stor_dbg(us, "Soft reset failed\n"); |
4d07ef76 | 1378 | else |
191648d0 | 1379 | usb_stor_dbg(us, "Soft reset done\n"); |
4d07ef76 | 1380 | return result; |
1da177e4 LT |
1381 | } |
1382 | ||
f0183a33 | 1383 | /* This issues a CB[I] Reset to the device in question */ |
1da177e4 LT |
1384 | #define CB_RESET_CMD_SIZE 12 |
1385 | ||
1386 | int usb_stor_CB_reset(struct us_data *us) | |
1387 | { | |
1da177e4 LT |
1388 | memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); |
1389 | us->iobuf[0] = SEND_DIAGNOSTIC; | |
1390 | us->iobuf[1] = 4; | |
1391 | return usb_stor_reset_common(us, US_CBI_ADSC, | |
1392 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1393 | 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE); | |
1394 | } | |
e6e244b6 | 1395 | EXPORT_SYMBOL_GPL(usb_stor_CB_reset); |
1da177e4 | 1396 | |
f0183a33 FB |
1397 | /* |
1398 | * This issues a Bulk-only Reset to the device in question, including | |
1da177e4 LT |
1399 | * clearing the subsequent endpoint halts that may occur. |
1400 | */ | |
1401 | int usb_stor_Bulk_reset(struct us_data *us) | |
1402 | { | |
1da177e4 LT |
1403 | return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, |
1404 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1405 | 0, us->ifnum, NULL, 0); | |
1406 | } | |
e6e244b6 | 1407 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); |
4d07ef76 | 1408 | |
f0183a33 FB |
1409 | /* |
1410 | * Issue a USB port reset to the device. The caller must not hold | |
47104b0d AS |
1411 | * us->dev_mutex. |
1412 | */ | |
4d07ef76 MD |
1413 | int usb_stor_port_reset(struct us_data *us) |
1414 | { | |
011b15df | 1415 | int result; |
4d07ef76 | 1416 | |
5d398779 | 1417 | /*for these devices we must use the class specific method */ |
7fda953f | 1418 | if (us->pusb_dev->quirks & USB_QUIRK_RESET) |
5d398779 ON |
1419 | return -EPERM; |
1420 | ||
011b15df | 1421 | result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); |
47104b0d | 1422 | if (result < 0) |
191648d0 JP |
1423 | usb_stor_dbg(us, "unable to lock device for reset: %d\n", |
1424 | result); | |
47104b0d AS |
1425 | else { |
1426 | /* Were we disconnected while waiting for the lock? */ | |
7e4d6c38 | 1427 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
47104b0d | 1428 | result = -EIO; |
191648d0 | 1429 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 | 1430 | } else { |
742120c6 | 1431 | result = usb_reset_device(us->pusb_dev); |
191648d0 JP |
1432 | usb_stor_dbg(us, "usb_reset_device returns %d\n", |
1433 | result); | |
4d07ef76 | 1434 | } |
011b15df | 1435 | usb_unlock_device(us->pusb_dev); |
4d07ef76 MD |
1436 | } |
1437 | return result; | |
1438 | } |