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5fd54ace | 1 | // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) |
d5e2b67a | 2 | /* |
d26a6aa0 | 3 | * f_mass_storage.c -- Mass Storage USB Composite Function |
d5e2b67a MN |
4 | * |
5 | * Copyright (C) 2003-2008 Alan Stern | |
d26a6aa0 | 6 | * Copyright (C) 2009 Samsung Electronics |
54b8360f | 7 | * Author: Michal Nazarewicz <mina86@mina86.com> |
d5e2b67a MN |
8 | * All rights reserved. |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions, and the following disclaimer, | |
15 | * without modification. | |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in the | |
18 | * documentation and/or other materials provided with the distribution. | |
19 | * 3. The names of the above-listed copyright holders may not be used | |
20 | * to endorse or promote products derived from this software without | |
21 | * specific prior written permission. | |
22 | * | |
23 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
24 | * GNU General Public License ("GPL") as published by the Free Software | |
25 | * Foundation, either version 2 of that License or (at your option) any | |
26 | * later version. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
29 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
30 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
31 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
32 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
33 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
34 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
35 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
36 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
37 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
38 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | */ | |
40 | ||
d5e2b67a | 41 | /* |
d26a6aa0 MN |
42 | * The Mass Storage Function acts as a USB Mass Storage device, |
43 | * appearing to the host as a disk drive or as a CD-ROM drive. In | |
44 | * addition to providing an example of a genuinely useful composite | |
45 | * function for a USB device, it also illustrates a technique of | |
46 | * double-buffering for increased throughput. | |
d5e2b67a | 47 | * |
a8287a4e MN |
48 | * For more information about MSF and in particular its module |
49 | * parameters and sysfs interface read the | |
50 | * <Documentation/usb/mass-storage.txt> file. | |
51 | */ | |
52 | ||
53 | /* | |
d26a6aa0 MN |
54 | * MSF is configured by specifying a fsg_config structure. It has the |
55 | * following fields: | |
56 | * | |
57 | * nluns Number of LUNs function have (anywhere from 1 | |
75ddead2 | 58 | * to FSG_MAX_LUNS). |
d26a6aa0 MN |
59 | * luns An array of LUN configuration values. This |
60 | * should be filled for each LUN that | |
61 | * function will include (ie. for "nluns" | |
62 | * LUNs). Each element of the array has | |
63 | * the following fields: | |
64 | * ->filename The path to the backing file for the LUN. | |
65 | * Required if LUN is not marked as | |
66 | * removable. | |
67 | * ->ro Flag specifying access to the LUN shall be | |
68 | * read-only. This is implied if CD-ROM | |
69 | * emulation is enabled as well as when | |
70 | * it was impossible to open "filename" | |
71 | * in R/W mode. | |
72 | * ->removable Flag specifying that LUN shall be indicated as | |
73 | * being removable. | |
74 | * ->cdrom Flag specifying that LUN shall be reported as | |
75 | * being a CD-ROM. | |
9cfe745e MN |
76 | * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12) |
77 | * commands for this LUN shall be ignored. | |
d26a6aa0 | 78 | * |
d26a6aa0 MN |
79 | * vendor_name |
80 | * product_name | |
81 | * release Information used as a reply to INQUIRY | |
82 | * request. To use default set to NULL, | |
83 | * NULL, 0xffff respectively. The first | |
84 | * field should be 8 and the second 16 | |
85 | * characters or less. | |
86 | * | |
87 | * can_stall Set to permit function to halt bulk endpoints. | |
88 | * Disabled on some USB devices known not | |
89 | * to work correctly. You should set it | |
90 | * to true. | |
91 | * | |
92 | * If "removable" is not set for a LUN then a backing file must be | |
93 | * specified. If it is set, then NULL filename means the LUN's medium | |
94 | * is not loaded (an empty string as "filename" in the fsg_config | |
95 | * structure causes error). The CD-ROM emulation includes a single | |
96 | * data track and no audio tracks; hence there need be only one | |
3f565a36 | 97 | * backing file per LUN. |
d26a6aa0 | 98 | * |
d26a6aa0 MN |
99 | * This function is heavily based on "File-backed Storage Gadget" by |
100 | * Alan Stern which in turn is heavily based on "Gadget Zero" by David | |
101 | * Brownell. The driver's SCSI command interface was based on the | |
102 | * "Information technology - Small Computer System Interface - 2" | |
103 | * document from X3T9.2 Project 375D, Revision 10L, 7-SEP-93, | |
104 | * available at <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. | |
105 | * The single exception is opcode 0x23 (READ FORMAT CAPACITIES), which | |
106 | * was based on the "Universal Serial Bus Mass Storage Class UFI | |
107 | * Command Specification" document, Revision 1.0, December 14, 1998, | |
108 | * available at | |
d5e2b67a MN |
109 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>. |
110 | */ | |
111 | ||
d5e2b67a MN |
112 | /* |
113 | * Driver Design | |
114 | * | |
d26a6aa0 | 115 | * The MSF is fairly straightforward. There is a main kernel |
d5e2b67a MN |
116 | * thread that handles most of the work. Interrupt routines field |
117 | * callbacks from the controller driver: bulk- and interrupt-request | |
118 | * completion notifications, endpoint-0 events, and disconnect events. | |
119 | * Completion events are passed to the main thread by wakeup calls. Many | |
120 | * ep0 requests are handled at interrupt time, but SetInterface, | |
121 | * SetConfiguration, and device reset requests are forwarded to the | |
122 | * thread in the form of "exceptions" using SIGUSR1 signals (since they | |
123 | * should interrupt any ongoing file I/O operations). | |
124 | * | |
125 | * The thread's main routine implements the standard command/data/status | |
126 | * parts of a SCSI interaction. It and its subroutines are full of tests | |
127 | * for pending signals/exceptions -- all this polling is necessary since | |
128 | * the kernel has no setjmp/longjmp equivalents. (Maybe this is an | |
129 | * indication that the driver really wants to be running in userspace.) | |
130 | * An important point is that so long as the thread is alive it keeps an | |
131 | * open reference to the backing file. This will prevent unmounting | |
132 | * the backing file's underlying filesystem and could cause problems | |
133 | * during system shutdown, for example. To prevent such problems, the | |
134 | * thread catches INT, TERM, and KILL signals and converts them into | |
135 | * an EXIT exception. | |
136 | * | |
137 | * In normal operation the main thread is started during the gadget's | |
d26a6aa0 MN |
138 | * fsg_bind() callback and stopped during fsg_unbind(). But it can |
139 | * also exit when it receives a signal, and there's no point leaving | |
a8287a4e | 140 | * the gadget running when the thread is dead. As of this moment, MSF |
d26a6aa0 MN |
141 | * provides no way to deregister the gadget when thread dies -- maybe |
142 | * a callback functions is needed. | |
d5e2b67a MN |
143 | * |
144 | * To provide maximum throughput, the driver uses a circular pipeline of | |
145 | * buffer heads (struct fsg_buffhd). In principle the pipeline can be | |
146 | * arbitrarily long; in practice the benefits don't justify having more | |
147 | * than 2 stages (i.e., double buffering). But it helps to think of the | |
148 | * pipeline as being a long one. Each buffer head contains a bulk-in and | |
149 | * a bulk-out request pointer (since the buffer can be used for both | |
150 | * output and input -- directions always are given from the host's | |
151 | * point of view) as well as a pointer to the buffer and various state | |
152 | * variables. | |
153 | * | |
154 | * Use of the pipeline follows a simple protocol. There is a variable | |
155 | * (fsg->next_buffhd_to_fill) that points to the next buffer head to use. | |
156 | * At any time that buffer head may still be in use from an earlier | |
157 | * request, so each buffer head has a state variable indicating whether | |
158 | * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the | |
159 | * buffer head to be EMPTY, filling the buffer either by file I/O or by | |
160 | * USB I/O (during which the buffer head is BUSY), and marking the buffer | |
161 | * head FULL when the I/O is complete. Then the buffer will be emptied | |
162 | * (again possibly by USB I/O, during which it is marked BUSY) and | |
163 | * finally marked EMPTY again (possibly by a completion routine). | |
164 | * | |
165 | * A module parameter tells the driver to avoid stalling the bulk | |
166 | * endpoints wherever the transport specification allows. This is | |
167 | * necessary for some UDCs like the SuperH, which cannot reliably clear a | |
168 | * halt on a bulk endpoint. However, under certain circumstances the | |
169 | * Bulk-only specification requires a stall. In such cases the driver | |
170 | * will halt the endpoint and set a flag indicating that it should clear | |
171 | * the halt in software during the next device reset. Hopefully this | |
172 | * will permit everything to work correctly. Furthermore, although the | |
173 | * specification allows the bulk-out endpoint to halt when the host sends | |
174 | * too much data, implementing this would cause an unavoidable race. | |
175 | * The driver will always use the "no-stall" approach for OUT transfers. | |
176 | * | |
177 | * One subtle point concerns sending status-stage responses for ep0 | |
178 | * requests. Some of these requests, such as device reset, can involve | |
179 | * interrupting an ongoing file I/O operation, which might take an | |
180 | * arbitrarily long time. During that delay the host might give up on | |
181 | * the original ep0 request and issue a new one. When that happens the | |
182 | * driver should not notify the host about completion of the original | |
183 | * request, as the host will no longer be waiting for it. So the driver | |
184 | * assigns to each ep0 request a unique tag, and it keeps track of the | |
185 | * tag value of the request associated with a long-running exception | |
186 | * (device-reset, interface-change, or configuration-change). When the | |
187 | * exception handler is finished, the status-stage response is submitted | |
188 | * only if the current ep0 request tag is equal to the exception request | |
189 | * tag. Thus only the most recently received ep0 request will get a | |
190 | * status-stage response. | |
191 | * | |
192 | * Warning: This driver source file is too long. It ought to be split up | |
193 | * into a header file plus about 3 separate .c files, to handle the details | |
194 | * of the Gadget, USB Mass Storage, and SCSI protocols. | |
195 | */ | |
196 | ||
197 | ||
198 | /* #define VERBOSE_DEBUG */ | |
199 | /* #define DUMP_MSGS */ | |
200 | ||
d5e2b67a MN |
201 | #include <linux/blkdev.h> |
202 | #include <linux/completion.h> | |
203 | #include <linux/dcache.h> | |
204 | #include <linux/delay.h> | |
205 | #include <linux/device.h> | |
206 | #include <linux/fcntl.h> | |
207 | #include <linux/file.h> | |
208 | #include <linux/fs.h> | |
209 | #include <linux/kref.h> | |
210 | #include <linux/kthread.h> | |
3f07c014 | 211 | #include <linux/sched/signal.h> |
d5e2b67a MN |
212 | #include <linux/limits.h> |
213 | #include <linux/rwsem.h> | |
214 | #include <linux/slab.h> | |
215 | #include <linux/spinlock.h> | |
216 | #include <linux/string.h> | |
217 | #include <linux/freezer.h> | |
e5eaa0dc | 218 | #include <linux/module.h> |
4a1e9211 | 219 | #include <linux/uaccess.h> |
d5e2b67a MN |
220 | |
221 | #include <linux/usb/ch9.h> | |
222 | #include <linux/usb/gadget.h> | |
a283c03a | 223 | #include <linux/usb/composite.h> |
d5e2b67a | 224 | |
ef0aa4b9 | 225 | #include "configfs.h" |
d5e2b67a MN |
226 | |
227 | ||
e8b6f8c5 | 228 | /*------------------------------------------------------------------------*/ |
d5e2b67a | 229 | |
d23b0f08 | 230 | #define FSG_DRIVER_DESC "Mass Storage Function" |
d26a6aa0 | 231 | #define FSG_DRIVER_VERSION "2009/09/11" |
d5e2b67a | 232 | |
d5e2b67a MN |
233 | static const char fsg_string_interface[] = "Mass Storage"; |
234 | ||
6fdc5dd2 | 235 | #include "storage_common.h" |
f3fed367 | 236 | #include "f_mass_storage.h" |
d5e2b67a | 237 | |
6fdc5dd2 AP |
238 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ |
239 | static struct usb_string fsg_strings[] = { | |
240 | {FSG_STRING_INTERFACE, fsg_string_interface}, | |
241 | {} | |
242 | }; | |
243 | ||
244 | static struct usb_gadget_strings fsg_stringtab = { | |
245 | .language = 0x0409, /* en-us */ | |
246 | .strings = fsg_strings, | |
247 | }; | |
d5e2b67a | 248 | |
4610f19b AP |
249 | static struct usb_gadget_strings *fsg_strings_array[] = { |
250 | &fsg_stringtab, | |
251 | NULL, | |
252 | }; | |
253 | ||
d5e2b67a MN |
254 | /*-------------------------------------------------------------------------*/ |
255 | ||
8ea864cf | 256 | struct fsg_dev; |
8876f5e7 MN |
257 | struct fsg_common; |
258 | ||
a41ae418 MN |
259 | /* Data shared by all the FSG instances. */ |
260 | struct fsg_common { | |
9c610213 | 261 | struct usb_gadget *gadget; |
95ed3236 | 262 | struct usb_composite_dev *cdev; |
b894f60a | 263 | struct fsg_dev *fsg, *new_fsg; |
225785ae | 264 | wait_queue_head_t io_wait; |
b894f60a | 265 | wait_queue_head_t fsg_wait; |
9c610213 | 266 | |
a41ae418 MN |
267 | /* filesem protects: backing files in use */ |
268 | struct rw_semaphore filesem; | |
269 | ||
225785ae | 270 | /* lock protects: state and thread_task */ |
8ea864cf MN |
271 | spinlock_t lock; |
272 | ||
273 | struct usb_ep *ep0; /* Copy of gadget->ep0 */ | |
274 | struct usb_request *ep0req; /* Copy of cdev->req */ | |
275 | unsigned int ep0_req_tag; | |
8ea864cf | 276 | |
a41ae418 MN |
277 | struct fsg_buffhd *next_buffhd_to_fill; |
278 | struct fsg_buffhd *next_buffhd_to_drain; | |
6532c7fd | 279 | struct fsg_buffhd *buffhds; |
6fdc5dd2 | 280 | unsigned int fsg_num_buffers; |
a41ae418 MN |
281 | |
282 | int cmnd_size; | |
283 | u8 cmnd[MAX_COMMAND_SIZE]; | |
284 | ||
a41ae418 | 285 | unsigned int lun; |
dd02ea5a | 286 | struct fsg_lun *luns[FSG_MAX_LUNS]; |
a41ae418 | 287 | struct fsg_lun *curlun; |
9c610213 | 288 | |
8ea864cf MN |
289 | unsigned int bulk_out_maxpacket; |
290 | enum fsg_state state; /* For exception handling */ | |
291 | unsigned int exception_req_tag; | |
292 | ||
8ea864cf MN |
293 | enum data_direction data_dir; |
294 | u32 data_size; | |
295 | u32 data_size_from_cmnd; | |
296 | u32 tag; | |
297 | u32 residue; | |
298 | u32 usb_amount_left; | |
299 | ||
481e4929 | 300 | unsigned int can_stall:1; |
9c610213 | 301 | unsigned int free_storage_on_release:1; |
8ea864cf MN |
302 | unsigned int phase_error:1; |
303 | unsigned int short_packet_received:1; | |
304 | unsigned int bad_lun_okay:1; | |
305 | unsigned int running:1; | |
bd528d4e | 306 | unsigned int sysfs:1; |
9c610213 | 307 | |
8ea864cf MN |
308 | struct completion thread_notifier; |
309 | struct task_struct *thread_task; | |
e8b6f8c5 | 310 | |
c85efcb9 MN |
311 | /* Gadget's private data. */ |
312 | void *private_data; | |
313 | ||
6ac47090 | 314 | char inquiry_string[INQUIRY_STRING_LEN]; |
481e4929 | 315 | |
9c610213 | 316 | struct kref ref; |
a41ae418 MN |
317 | }; |
318 | ||
d5e2b67a | 319 | struct fsg_dev { |
d23b0f08 | 320 | struct usb_function function; |
d23b0f08 | 321 | struct usb_gadget *gadget; /* Copy of cdev->gadget */ |
a41ae418 MN |
322 | struct fsg_common *common; |
323 | ||
d23b0f08 MN |
324 | u16 interface_number; |
325 | ||
d26a6aa0 MN |
326 | unsigned int bulk_in_enabled:1; |
327 | unsigned int bulk_out_enabled:1; | |
d5e2b67a MN |
328 | |
329 | unsigned long atomic_bitflags; | |
8ea864cf | 330 | #define IGNORE_BULK_OUT 0 |
d5e2b67a MN |
331 | |
332 | struct usb_ep *bulk_in; | |
333 | struct usb_ep *bulk_out; | |
8ea864cf | 334 | }; |
d5e2b67a | 335 | |
8ea864cf MN |
336 | static inline int __fsg_is_set(struct fsg_common *common, |
337 | const char *func, unsigned line) | |
338 | { | |
339 | if (common->fsg) | |
340 | return 1; | |
341 | ERROR(common, "common->fsg is NULL in %s at %u\n", func, line); | |
8876f5e7 | 342 | WARN_ON(1); |
8ea864cf MN |
343 | return 0; |
344 | } | |
345 | ||
346 | #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__)) | |
d5e2b67a | 347 | |
d23b0f08 MN |
348 | static inline struct fsg_dev *fsg_from_func(struct usb_function *f) |
349 | { | |
350 | return container_of(f, struct fsg_dev, function); | |
351 | } | |
352 | ||
d5e2b67a MN |
353 | typedef void (*fsg_routine_t)(struct fsg_dev *); |
354 | ||
8ea864cf | 355 | static int exception_in_progress(struct fsg_common *common) |
d5e2b67a | 356 | { |
78db441d | 357 | return common->state > FSG_STATE_NORMAL; |
d5e2b67a MN |
358 | } |
359 | ||
98346f7d GKH |
360 | /* Make bulk-out requests be divisible by the maxpacket size */ |
361 | static void set_bulk_out_req_length(struct fsg_common *common, | |
362 | struct fsg_buffhd *bh, unsigned int length) | |
363 | { | |
364 | unsigned int rem; | |
365 | ||
366 | bh->bulk_out_intended_length = length; | |
367 | rem = length % common->bulk_out_maxpacket; | |
368 | if (rem > 0) | |
369 | length += common->bulk_out_maxpacket - rem; | |
370 | bh->outreq->length = length; | |
371 | } | |
372 | ||
373 | ||
d5e2b67a MN |
374 | /*-------------------------------------------------------------------------*/ |
375 | ||
376 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) | |
377 | { | |
378 | const char *name; | |
379 | ||
380 | if (ep == fsg->bulk_in) | |
381 | name = "bulk-in"; | |
382 | else if (ep == fsg->bulk_out) | |
383 | name = "bulk-out"; | |
384 | else | |
385 | name = ep->name; | |
386 | DBG(fsg, "%s set halt\n", name); | |
387 | return usb_ep_set_halt(ep); | |
388 | } | |
389 | ||
390 | ||
d5e2b67a MN |
391 | /*-------------------------------------------------------------------------*/ |
392 | ||
393 | /* These routines may be called in process context or in_irq */ | |
394 | ||
8ea864cf | 395 | static void raise_exception(struct fsg_common *common, enum fsg_state new_state) |
d5e2b67a MN |
396 | { |
397 | unsigned long flags; | |
398 | ||
b73af61e MN |
399 | /* |
400 | * Do nothing if a higher-priority exception is already in progress. | |
d5e2b67a | 401 | * If a lower-or-equal priority exception is in progress, preempt it |
b73af61e MN |
402 | * and notify the main thread by sending it a signal. |
403 | */ | |
8ea864cf MN |
404 | spin_lock_irqsave(&common->lock, flags); |
405 | if (common->state <= new_state) { | |
406 | common->exception_req_tag = common->ep0_req_tag; | |
407 | common->state = new_state; | |
408 | if (common->thread_task) | |
d5e2b67a | 409 | send_sig_info(SIGUSR1, SEND_SIG_FORCED, |
8ea864cf | 410 | common->thread_task); |
d5e2b67a | 411 | } |
8ea864cf | 412 | spin_unlock_irqrestore(&common->lock, flags); |
d5e2b67a MN |
413 | } |
414 | ||
415 | ||
416 | /*-------------------------------------------------------------------------*/ | |
417 | ||
8ea864cf | 418 | static int ep0_queue(struct fsg_common *common) |
d5e2b67a MN |
419 | { |
420 | int rc; | |
421 | ||
8ea864cf MN |
422 | rc = usb_ep_queue(common->ep0, common->ep0req, GFP_ATOMIC); |
423 | common->ep0->driver_data = common; | |
d5e2b67a | 424 | if (rc != 0 && rc != -ESHUTDOWN) { |
d5e2b67a | 425 | /* We can't do much more than wait for a reset */ |
8ea864cf MN |
426 | WARNING(common, "error in submission: %s --> %d\n", |
427 | common->ep0->name, rc); | |
d5e2b67a MN |
428 | } |
429 | return rc; | |
430 | } | |
431 | ||
b73af61e | 432 | |
d5e2b67a MN |
433 | /*-------------------------------------------------------------------------*/ |
434 | ||
b73af61e | 435 | /* Completion handlers. These always run in_irq. */ |
d5e2b67a MN |
436 | |
437 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) | |
438 | { | |
8ea864cf | 439 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
440 | struct fsg_buffhd *bh = req->context; |
441 | ||
442 | if (req->status || req->actual != req->length) | |
8ea864cf | 443 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
b73af61e | 444 | req->status, req->actual, req->length); |
d26a6aa0 | 445 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
446 | usb_ep_fifo_flush(ep); |
447 | ||
225785ae AS |
448 | /* Synchronize with the smp_load_acquire() in sleep_thread() */ |
449 | smp_store_release(&bh->state, BUF_STATE_EMPTY); | |
450 | wake_up(&common->io_wait); | |
d5e2b67a MN |
451 | } |
452 | ||
453 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) | |
454 | { | |
8ea864cf | 455 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
456 | struct fsg_buffhd *bh = req->context; |
457 | ||
8ea864cf | 458 | dump_msg(common, "bulk-out", req->buf, req->actual); |
98346f7d | 459 | if (req->status || req->actual != bh->bulk_out_intended_length) |
8ea864cf | 460 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
98346f7d | 461 | req->status, req->actual, bh->bulk_out_intended_length); |
d26a6aa0 | 462 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
463 | usb_ep_fifo_flush(ep); |
464 | ||
225785ae AS |
465 | /* Synchronize with the smp_load_acquire() in sleep_thread() */ |
466 | smp_store_release(&bh->state, BUF_STATE_FULL); | |
467 | wake_up(&common->io_wait); | |
d5e2b67a MN |
468 | } |
469 | ||
dd02ea5a KO |
470 | static int _fsg_common_get_max_lun(struct fsg_common *common) |
471 | { | |
472 | int i = ARRAY_SIZE(common->luns) - 1; | |
473 | ||
474 | while (i >= 0 && !common->luns[i]) | |
475 | --i; | |
476 | ||
477 | return i; | |
478 | } | |
479 | ||
d23b0f08 | 480 | static int fsg_setup(struct usb_function *f, |
b73af61e | 481 | const struct usb_ctrlrequest *ctrl) |
d5e2b67a | 482 | { |
d23b0f08 | 483 | struct fsg_dev *fsg = fsg_from_func(f); |
8ea864cf | 484 | struct usb_request *req = fsg->common->ep0req; |
d5e2b67a | 485 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
93bcf12e | 486 | u16 w_value = le16_to_cpu(ctrl->wValue); |
d5e2b67a MN |
487 | u16 w_length = le16_to_cpu(ctrl->wLength); |
488 | ||
b894f60a | 489 | if (!fsg_is_set(fsg->common)) |
93bcf12e | 490 | return -EOPNOTSUPP; |
d5e2b67a | 491 | |
73ee4da9 RQ |
492 | ++fsg->common->ep0_req_tag; /* Record arrival of a new request */ |
493 | req->context = NULL; | |
494 | req->length = 0; | |
495 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); | |
496 | ||
93bcf12e | 497 | switch (ctrl->bRequest) { |
d5e2b67a | 498 | |
775dafdc | 499 | case US_BULK_RESET_REQUEST: |
93bcf12e MN |
500 | if (ctrl->bRequestType != |
501 | (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 502 | break; |
ce7b6121 PZ |
503 | if (w_index != fsg->interface_number || w_value != 0 || |
504 | w_length != 0) | |
93bcf12e | 505 | return -EDOM; |
d5e2b67a | 506 | |
b73af61e MN |
507 | /* |
508 | * Raise an exception to stop the current operation | |
509 | * and reinitialize our state. | |
510 | */ | |
93bcf12e | 511 | DBG(fsg, "bulk reset request\n"); |
78db441d | 512 | raise_exception(fsg->common, FSG_STATE_PROTOCOL_RESET); |
655403c2 | 513 | return USB_GADGET_DELAYED_STATUS; |
d5e2b67a | 514 | |
775dafdc | 515 | case US_BULK_GET_MAX_LUN: |
93bcf12e MN |
516 | if (ctrl->bRequestType != |
517 | (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 518 | break; |
db332bc9 PZ |
519 | if (w_index != fsg->interface_number || w_value != 0 || |
520 | w_length != 1) | |
93bcf12e MN |
521 | return -EDOM; |
522 | VDBG(fsg, "get max LUN\n"); | |
dd02ea5a | 523 | *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); |
b00ce11f MN |
524 | |
525 | /* Respond with data/status */ | |
d7e18a9f | 526 | req->length = min((u16)1, w_length); |
b00ce11f | 527 | return ep0_queue(fsg->common); |
93bcf12e MN |
528 | } |
529 | ||
530 | VDBG(fsg, | |
b73af61e | 531 | "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n", |
93bcf12e MN |
532 | ctrl->bRequestType, ctrl->bRequest, |
533 | le16_to_cpu(ctrl->wValue), w_index, w_length); | |
534 | return -EOPNOTSUPP; | |
d5e2b67a MN |
535 | } |
536 | ||
537 | ||
d5e2b67a MN |
538 | /*-------------------------------------------------------------------------*/ |
539 | ||
540 | /* All the following routines run in process context */ | |
541 | ||
d5e2b67a | 542 | /* Use this for bulk or interrupt transfers, not ep0 */ |
225785ae AS |
543 | static int start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, |
544 | struct usb_request *req) | |
d5e2b67a MN |
545 | { |
546 | int rc; | |
547 | ||
548 | if (ep == fsg->bulk_in) | |
549 | dump_msg(fsg, "bulk-in", req->buf, req->length); | |
d5e2b67a | 550 | |
d5e2b67a | 551 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
225785ae | 552 | if (rc) { |
d5e2b67a | 553 | |
225785ae AS |
554 | /* We can't do much more than wait for a reset */ |
555 | req->status = rc; | |
4953ef65 | 556 | |
225785ae AS |
557 | /* |
558 | * Note: currently the net2280 driver fails zero-length | |
559 | * submissions if DMA is enabled. | |
560 | */ | |
561 | if (rc != -ESHUTDOWN && | |
562 | !(rc == -EOPNOTSUPP && req->length == 0)) | |
563 | WARNING(fsg, "error in submission: %s --> %d\n", | |
564 | ep->name, rc); | |
565 | } | |
566 | return rc; | |
d5e2b67a MN |
567 | } |
568 | ||
fe52f792 MN |
569 | static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
570 | { | |
571 | if (!fsg_is_set(common)) | |
572 | return false; | |
225785ae AS |
573 | bh->state = BUF_STATE_SENDING; |
574 | if (start_transfer(common->fsg, common->fsg->bulk_in, bh->inreq)) | |
575 | bh->state = BUF_STATE_EMPTY; | |
fe52f792 MN |
576 | return true; |
577 | } | |
8ea864cf | 578 | |
fe52f792 MN |
579 | static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
580 | { | |
581 | if (!fsg_is_set(common)) | |
582 | return false; | |
225785ae AS |
583 | bh->state = BUF_STATE_RECEIVING; |
584 | if (start_transfer(common->fsg, common->fsg->bulk_out, bh->outreq)) | |
585 | bh->state = BUF_STATE_FULL; | |
fe52f792 MN |
586 | return true; |
587 | } | |
d5e2b67a | 588 | |
225785ae AS |
589 | static int sleep_thread(struct fsg_common *common, bool can_freeze, |
590 | struct fsg_buffhd *bh) | |
d5e2b67a | 591 | { |
225785ae | 592 | int rc; |
d5e2b67a | 593 | |
225785ae AS |
594 | /* Wait until a signal arrives or bh is no longer busy */ |
595 | if (can_freeze) | |
596 | /* | |
597 | * synchronize with the smp_store_release(&bh->state) in | |
598 | * bulk_in_complete() or bulk_out_complete() | |
599 | */ | |
600 | rc = wait_event_freezable(common->io_wait, | |
601 | bh && smp_load_acquire(&bh->state) >= | |
602 | BUF_STATE_EMPTY); | |
603 | else | |
604 | rc = wait_event_interruptible(common->io_wait, | |
605 | bh && smp_load_acquire(&bh->state) >= | |
606 | BUF_STATE_EMPTY); | |
607 | return rc ? -EINTR : 0; | |
d5e2b67a MN |
608 | } |
609 | ||
610 | ||
611 | /*-------------------------------------------------------------------------*/ | |
612 | ||
8ea864cf | 613 | static int do_read(struct fsg_common *common) |
d5e2b67a | 614 | { |
8ea864cf | 615 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
616 | u32 lba; |
617 | struct fsg_buffhd *bh; | |
618 | int rc; | |
619 | u32 amount_left; | |
620 | loff_t file_offset, file_offset_tmp; | |
621 | unsigned int amount; | |
d5e2b67a MN |
622 | ssize_t nread; |
623 | ||
b73af61e MN |
624 | /* |
625 | * Get the starting Logical Block Address and check that it's | |
626 | * not too big. | |
627 | */ | |
0a6a717c | 628 | if (common->cmnd[0] == READ_6) |
8ea864cf | 629 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 630 | else { |
8ea864cf | 631 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 632 | |
b73af61e MN |
633 | /* |
634 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a | 635 | * cache) and FUA (Force Unit Access = don't read from the |
b73af61e MN |
636 | * cache), but we don't implement them. |
637 | */ | |
8ea864cf | 638 | if ((common->cmnd[1] & ~0x18) != 0) { |
d5e2b67a MN |
639 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
640 | return -EINVAL; | |
641 | } | |
642 | } | |
643 | if (lba >= curlun->num_sectors) { | |
644 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
645 | return -EINVAL; | |
646 | } | |
3f565a36 | 647 | file_offset = ((loff_t) lba) << curlun->blkbits; |
d5e2b67a MN |
648 | |
649 | /* Carry out the file reads */ | |
8ea864cf | 650 | amount_left = common->data_size_from_cmnd; |
d5e2b67a | 651 | if (unlikely(amount_left == 0)) |
d26a6aa0 | 652 | return -EIO; /* No default reply */ |
d5e2b67a MN |
653 | |
654 | for (;;) { | |
b73af61e MN |
655 | /* |
656 | * Figure out how much we need to read: | |
d5e2b67a MN |
657 | * Try to read the remaining amount. |
658 | * But don't read more than the buffer size. | |
659 | * And don't try to read past the end of the file. | |
b73af61e | 660 | */ |
93bcf12e | 661 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
662 | amount = min((loff_t)amount, |
663 | curlun->file_length - file_offset); | |
d5e2b67a MN |
664 | |
665 | /* Wait for the next buffer to become available */ | |
8ea864cf | 666 | bh = common->next_buffhd_to_fill; |
225785ae AS |
667 | rc = sleep_thread(common, false, bh); |
668 | if (rc) | |
669 | return rc; | |
d5e2b67a | 670 | |
b73af61e MN |
671 | /* |
672 | * If we were asked to read past the end of file, | |
673 | * end with an empty buffer. | |
674 | */ | |
d5e2b67a MN |
675 | if (amount == 0) { |
676 | curlun->sense_data = | |
677 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
678 | curlun->sense_data_info = |
679 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
680 | curlun->info_valid = 1; |
681 | bh->inreq->length = 0; | |
682 | bh->state = BUF_STATE_FULL; | |
683 | break; | |
684 | } | |
685 | ||
686 | /* Perform the read */ | |
687 | file_offset_tmp = file_offset; | |
05a4a33b CH |
688 | nread = kernel_read(curlun->filp, bh->buf, amount, |
689 | &file_offset_tmp); | |
d5e2b67a | 690 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
b73af61e | 691 | (unsigned long long)file_offset, (int)nread); |
d5e2b67a MN |
692 | if (signal_pending(current)) |
693 | return -EINTR; | |
694 | ||
695 | if (nread < 0) { | |
b73af61e | 696 | LDBG(curlun, "error in file read: %d\n", (int)nread); |
d5e2b67a MN |
697 | nread = 0; |
698 | } else if (nread < amount) { | |
699 | LDBG(curlun, "partial file read: %d/%u\n", | |
b73af61e | 700 | (int)nread, amount); |
3f565a36 | 701 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
702 | } |
703 | file_offset += nread; | |
704 | amount_left -= nread; | |
8ea864cf | 705 | common->residue -= nread; |
04eee25b AS |
706 | |
707 | /* | |
708 | * Except at the end of the transfer, nread will be | |
709 | * equal to the buffer size, which is divisible by the | |
710 | * bulk-in maxpacket size. | |
711 | */ | |
d5e2b67a MN |
712 | bh->inreq->length = nread; |
713 | bh->state = BUF_STATE_FULL; | |
714 | ||
715 | /* If an error occurred, report it and its position */ | |
716 | if (nread < amount) { | |
717 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
718 | curlun->sense_data_info = |
719 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
720 | curlun->info_valid = 1; |
721 | break; | |
722 | } | |
723 | ||
724 | if (amount_left == 0) | |
d26a6aa0 | 725 | break; /* No more left to read */ |
d5e2b67a MN |
726 | |
727 | /* Send this buffer and go read some more */ | |
728 | bh->inreq->zero = 0; | |
fe52f792 MN |
729 | if (!start_in_transfer(common, bh)) |
730 | /* Don't know what to do if common->fsg is NULL */ | |
8ea864cf MN |
731 | return -EIO; |
732 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
733 | } |
734 | ||
d26a6aa0 | 735 | return -EIO; /* No default reply */ |
d5e2b67a MN |
736 | } |
737 | ||
738 | ||
739 | /*-------------------------------------------------------------------------*/ | |
740 | ||
8ea864cf | 741 | static int do_write(struct fsg_common *common) |
d5e2b67a | 742 | { |
8ea864cf | 743 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
744 | u32 lba; |
745 | struct fsg_buffhd *bh; | |
746 | int get_some_more; | |
747 | u32 amount_left_to_req, amount_left_to_write; | |
748 | loff_t usb_offset, file_offset, file_offset_tmp; | |
749 | unsigned int amount; | |
d5e2b67a MN |
750 | ssize_t nwritten; |
751 | int rc; | |
752 | ||
753 | if (curlun->ro) { | |
754 | curlun->sense_data = SS_WRITE_PROTECTED; | |
755 | return -EINVAL; | |
756 | } | |
757 | spin_lock(&curlun->filp->f_lock); | |
d26a6aa0 | 758 | curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */ |
d5e2b67a MN |
759 | spin_unlock(&curlun->filp->f_lock); |
760 | ||
b73af61e MN |
761 | /* |
762 | * Get the starting Logical Block Address and check that it's | |
763 | * not too big | |
764 | */ | |
0a6a717c | 765 | if (common->cmnd[0] == WRITE_6) |
8ea864cf | 766 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 767 | else { |
8ea864cf | 768 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 769 | |
b73af61e MN |
770 | /* |
771 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a MN |
772 | * cache) and FUA (Force Unit Access = write directly to the |
773 | * medium). We don't implement DPO; we implement FUA by | |
b73af61e MN |
774 | * performing synchronous output. |
775 | */ | |
8ea864cf | 776 | if (common->cmnd[1] & ~0x18) { |
d5e2b67a MN |
777 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
778 | return -EINVAL; | |
779 | } | |
9cfe745e | 780 | if (!curlun->nofua && (common->cmnd[1] & 0x08)) { /* FUA */ |
d5e2b67a MN |
781 | spin_lock(&curlun->filp->f_lock); |
782 | curlun->filp->f_flags |= O_SYNC; | |
783 | spin_unlock(&curlun->filp->f_lock); | |
784 | } | |
785 | } | |
786 | if (lba >= curlun->num_sectors) { | |
787 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
788 | return -EINVAL; | |
789 | } | |
790 | ||
791 | /* Carry out the file writes */ | |
792 | get_some_more = 1; | |
3f565a36 | 793 | file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits; |
8ea864cf MN |
794 | amount_left_to_req = common->data_size_from_cmnd; |
795 | amount_left_to_write = common->data_size_from_cmnd; | |
d5e2b67a MN |
796 | |
797 | while (amount_left_to_write > 0) { | |
798 | ||
799 | /* Queue a request for more data from the host */ | |
8ea864cf | 800 | bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
801 | if (bh->state == BUF_STATE_EMPTY && get_some_more) { |
802 | ||
b73af61e MN |
803 | /* |
804 | * Figure out how much we want to get: | |
04eee25b AS |
805 | * Try to get the remaining amount, |
806 | * but not more than the buffer size. | |
b73af61e | 807 | */ |
93bcf12e | 808 | amount = min(amount_left_to_req, FSG_BUFLEN); |
04eee25b AS |
809 | |
810 | /* Beyond the end of the backing file? */ | |
811 | if (usb_offset >= curlun->file_length) { | |
d5e2b67a MN |
812 | get_some_more = 0; |
813 | curlun->sense_data = | |
814 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
815 | curlun->sense_data_info = |
816 | usb_offset >> curlun->blkbits; | |
d5e2b67a MN |
817 | curlun->info_valid = 1; |
818 | continue; | |
819 | } | |
d5e2b67a MN |
820 | |
821 | /* Get the next buffer */ | |
822 | usb_offset += amount; | |
8ea864cf | 823 | common->usb_amount_left -= amount; |
d5e2b67a MN |
824 | amount_left_to_req -= amount; |
825 | if (amount_left_to_req == 0) | |
826 | get_some_more = 0; | |
827 | ||
b73af61e | 828 | /* |
04eee25b AS |
829 | * Except at the end of the transfer, amount will be |
830 | * equal to the buffer size, which is divisible by | |
831 | * the bulk-out maxpacket size. | |
b73af61e | 832 | */ |
fe696765 | 833 | set_bulk_out_req_length(common, bh, amount); |
fe52f792 | 834 | if (!start_out_transfer(common, bh)) |
b73af61e | 835 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf MN |
836 | return -EIO; |
837 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
838 | continue; |
839 | } | |
840 | ||
841 | /* Write the received data to the backing file */ | |
8ea864cf | 842 | bh = common->next_buffhd_to_drain; |
d5e2b67a | 843 | if (bh->state == BUF_STATE_EMPTY && !get_some_more) |
d26a6aa0 | 844 | break; /* We stopped early */ |
225785ae AS |
845 | |
846 | /* Wait for the data to be received */ | |
847 | rc = sleep_thread(common, false, bh); | |
848 | if (rc) | |
849 | return rc; | |
850 | ||
851 | common->next_buffhd_to_drain = bh->next; | |
852 | bh->state = BUF_STATE_EMPTY; | |
853 | ||
854 | /* Did something go wrong with the transfer? */ | |
855 | if (bh->outreq->status != 0) { | |
856 | curlun->sense_data = SS_COMMUNICATION_FAILURE; | |
857 | curlun->sense_data_info = | |
3f565a36 | 858 | file_offset >> curlun->blkbits; |
225785ae AS |
859 | curlun->info_valid = 1; |
860 | break; | |
861 | } | |
d5e2b67a | 862 | |
225785ae AS |
863 | amount = bh->outreq->actual; |
864 | if (curlun->file_length - file_offset < amount) { | |
865 | LERROR(curlun, "write %u @ %llu beyond end %llu\n", | |
b73af61e MN |
866 | amount, (unsigned long long)file_offset, |
867 | (unsigned long long)curlun->file_length); | |
225785ae AS |
868 | amount = curlun->file_length - file_offset; |
869 | } | |
d5e2b67a | 870 | |
225785ae AS |
871 | /* |
872 | * Don't accept excess data. The spec doesn't say | |
873 | * what to do in this case. We'll ignore the error. | |
874 | */ | |
875 | amount = min(amount, bh->bulk_out_intended_length); | |
d5e2b67a | 876 | |
225785ae AS |
877 | /* Don't write a partial block */ |
878 | amount = round_down(amount, curlun->blksize); | |
879 | if (amount == 0) | |
880 | goto empty_write; | |
881 | ||
882 | /* Perform the write */ | |
883 | file_offset_tmp = file_offset; | |
05a4a33b CH |
884 | nwritten = kernel_write(curlun->filp, bh->buf, amount, |
885 | &file_offset_tmp); | |
225785ae AS |
886 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, |
887 | (unsigned long long)file_offset, (int)nwritten); | |
888 | if (signal_pending(current)) | |
889 | return -EINTR; /* Interrupted! */ | |
890 | ||
891 | if (nwritten < 0) { | |
892 | LDBG(curlun, "error in file write: %d\n", | |
893 | (int) nwritten); | |
894 | nwritten = 0; | |
895 | } else if (nwritten < amount) { | |
896 | LDBG(curlun, "partial file write: %d/%u\n", | |
897 | (int) nwritten, amount); | |
898 | nwritten = round_down(nwritten, curlun->blksize); | |
899 | } | |
900 | file_offset += nwritten; | |
901 | amount_left_to_write -= nwritten; | |
902 | common->residue -= nwritten; | |
903 | ||
904 | /* If an error occurred, report it and its position */ | |
905 | if (nwritten < amount) { | |
906 | curlun->sense_data = SS_WRITE_ERROR; | |
907 | curlun->sense_data_info = | |
3f565a36 | 908 | file_offset >> curlun->blkbits; |
225785ae AS |
909 | curlun->info_valid = 1; |
910 | break; | |
911 | } | |
d5e2b67a | 912 | |
04eee25b | 913 | empty_write: |
225785ae AS |
914 | /* Did the host decide to stop early? */ |
915 | if (bh->outreq->actual < bh->bulk_out_intended_length) { | |
916 | common->short_packet_received = 1; | |
917 | break; | |
d5e2b67a | 918 | } |
d5e2b67a MN |
919 | } |
920 | ||
d26a6aa0 | 921 | return -EIO; /* No default reply */ |
d5e2b67a MN |
922 | } |
923 | ||
924 | ||
925 | /*-------------------------------------------------------------------------*/ | |
926 | ||
8ea864cf | 927 | static int do_synchronize_cache(struct fsg_common *common) |
d5e2b67a | 928 | { |
8ea864cf | 929 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
930 | int rc; |
931 | ||
932 | /* We ignore the requested LBA and write out all file's | |
933 | * dirty data buffers. */ | |
934 | rc = fsg_lun_fsync_sub(curlun); | |
935 | if (rc) | |
936 | curlun->sense_data = SS_WRITE_ERROR; | |
937 | return 0; | |
938 | } | |
939 | ||
940 | ||
941 | /*-------------------------------------------------------------------------*/ | |
942 | ||
943 | static void invalidate_sub(struct fsg_lun *curlun) | |
944 | { | |
945 | struct file *filp = curlun->filp; | |
496ad9aa | 946 | struct inode *inode = file_inode(filp); |
d5e2b67a MN |
947 | unsigned long rc; |
948 | ||
949 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); | |
2ecdc82e | 950 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc); |
d5e2b67a MN |
951 | } |
952 | ||
8ea864cf | 953 | static int do_verify(struct fsg_common *common) |
d5e2b67a | 954 | { |
8ea864cf | 955 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
956 | u32 lba; |
957 | u32 verification_length; | |
8ea864cf | 958 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
959 | loff_t file_offset, file_offset_tmp; |
960 | u32 amount_left; | |
961 | unsigned int amount; | |
962 | ssize_t nread; | |
963 | ||
b73af61e MN |
964 | /* |
965 | * Get the starting Logical Block Address and check that it's | |
966 | * not too big. | |
967 | */ | |
8ea864cf | 968 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a MN |
969 | if (lba >= curlun->num_sectors) { |
970 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
971 | return -EINVAL; | |
972 | } | |
973 | ||
b73af61e MN |
974 | /* |
975 | * We allow DPO (Disable Page Out = don't save data in the | |
976 | * cache) but we don't implement it. | |
977 | */ | |
8ea864cf | 978 | if (common->cmnd[1] & ~0x10) { |
d5e2b67a MN |
979 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
980 | return -EINVAL; | |
981 | } | |
982 | ||
8ea864cf | 983 | verification_length = get_unaligned_be16(&common->cmnd[7]); |
d5e2b67a | 984 | if (unlikely(verification_length == 0)) |
d26a6aa0 | 985 | return -EIO; /* No default reply */ |
d5e2b67a MN |
986 | |
987 | /* Prepare to carry out the file verify */ | |
3f565a36 PL |
988 | amount_left = verification_length << curlun->blkbits; |
989 | file_offset = ((loff_t) lba) << curlun->blkbits; | |
d5e2b67a MN |
990 | |
991 | /* Write out all the dirty buffers before invalidating them */ | |
992 | fsg_lun_fsync_sub(curlun); | |
993 | if (signal_pending(current)) | |
994 | return -EINTR; | |
995 | ||
996 | invalidate_sub(curlun); | |
997 | if (signal_pending(current)) | |
998 | return -EINTR; | |
999 | ||
1000 | /* Just try to read the requested blocks */ | |
1001 | while (amount_left > 0) { | |
b73af61e MN |
1002 | /* |
1003 | * Figure out how much we need to read: | |
d5e2b67a MN |
1004 | * Try to read the remaining amount, but not more than |
1005 | * the buffer size. | |
1006 | * And don't try to read past the end of the file. | |
b73af61e | 1007 | */ |
93bcf12e | 1008 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
1009 | amount = min((loff_t)amount, |
1010 | curlun->file_length - file_offset); | |
d5e2b67a MN |
1011 | if (amount == 0) { |
1012 | curlun->sense_data = | |
1013 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
1014 | curlun->sense_data_info = |
1015 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1016 | curlun->info_valid = 1; |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | /* Perform the read */ | |
1021 | file_offset_tmp = file_offset; | |
05a4a33b CH |
1022 | nread = kernel_read(curlun->filp, bh->buf, amount, |
1023 | &file_offset_tmp); | |
d5e2b67a MN |
1024 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
1025 | (unsigned long long) file_offset, | |
1026 | (int) nread); | |
1027 | if (signal_pending(current)) | |
1028 | return -EINTR; | |
1029 | ||
1030 | if (nread < 0) { | |
b73af61e | 1031 | LDBG(curlun, "error in file verify: %d\n", (int)nread); |
d5e2b67a MN |
1032 | nread = 0; |
1033 | } else if (nread < amount) { | |
1034 | LDBG(curlun, "partial file verify: %d/%u\n", | |
b73af61e | 1035 | (int)nread, amount); |
3f565a36 | 1036 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
1037 | } |
1038 | if (nread == 0) { | |
1039 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
1040 | curlun->sense_data_info = |
1041 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1042 | curlun->info_valid = 1; |
1043 | break; | |
1044 | } | |
1045 | file_offset += nread; | |
1046 | amount_left -= nread; | |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | /*-------------------------------------------------------------------------*/ | |
1053 | ||
8ea864cf | 1054 | static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1055 | { |
8ea864cf | 1056 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1057 | u8 *buf = (u8 *) bh->buf; |
1058 | ||
481e4929 | 1059 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1060 | common->bad_lun_okay = 1; |
d5e2b67a | 1061 | memset(buf, 0, 36); |
fddc26f5 | 1062 | buf[0] = TYPE_NO_LUN; /* Unsupported, no device-type */ |
d26a6aa0 | 1063 | buf[4] = 31; /* Additional length */ |
d5e2b67a MN |
1064 | return 36; |
1065 | } | |
1066 | ||
0a6a717c | 1067 | buf[0] = curlun->cdrom ? TYPE_ROM : TYPE_DISK; |
481e4929 | 1068 | buf[1] = curlun->removable ? 0x80 : 0; |
d26a6aa0 MN |
1069 | buf[2] = 2; /* ANSI SCSI level 2 */ |
1070 | buf[3] = 2; /* SCSI-2 INQUIRY data format */ | |
1071 | buf[4] = 31; /* Additional length */ | |
1072 | buf[5] = 0; /* No special options */ | |
481e4929 MN |
1073 | buf[6] = 0; |
1074 | buf[7] = 0; | |
6ac47090 PG |
1075 | if (curlun->inquiry_string[0]) |
1076 | memcpy(buf + 8, curlun->inquiry_string, | |
1077 | sizeof(curlun->inquiry_string)); | |
1078 | else | |
1079 | memcpy(buf + 8, common->inquiry_string, | |
1080 | sizeof(common->inquiry_string)); | |
d5e2b67a MN |
1081 | return 36; |
1082 | } | |
1083 | ||
8ea864cf | 1084 | static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1085 | { |
8ea864cf | 1086 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1087 | u8 *buf = (u8 *) bh->buf; |
1088 | u32 sd, sdinfo; | |
1089 | int valid; | |
1090 | ||
1091 | /* | |
1092 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): | |
1093 | * | |
1094 | * If a REQUEST SENSE command is received from an initiator | |
1095 | * with a pending unit attention condition (before the target | |
1096 | * generates the contingent allegiance condition), then the | |
1097 | * target shall either: | |
1098 | * a) report any pending sense data and preserve the unit | |
1099 | * attention condition on the logical unit, or, | |
1100 | * b) report the unit attention condition, may discard any | |
1101 | * pending sense data, and clear the unit attention | |
1102 | * condition on the logical unit for that initiator. | |
1103 | * | |
1104 | * FSG normally uses option a); enable this code to use option b). | |
1105 | */ | |
1106 | #if 0 | |
1107 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { | |
1108 | curlun->sense_data = curlun->unit_attention_data; | |
1109 | curlun->unit_attention_data = SS_NO_SENSE; | |
1110 | } | |
1111 | #endif | |
1112 | ||
d26a6aa0 | 1113 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1114 | common->bad_lun_okay = 1; |
d5e2b67a MN |
1115 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
1116 | sdinfo = 0; | |
1117 | valid = 0; | |
1118 | } else { | |
1119 | sd = curlun->sense_data; | |
1120 | sdinfo = curlun->sense_data_info; | |
1121 | valid = curlun->info_valid << 7; | |
1122 | curlun->sense_data = SS_NO_SENSE; | |
1123 | curlun->sense_data_info = 0; | |
1124 | curlun->info_valid = 0; | |
1125 | } | |
1126 | ||
1127 | memset(buf, 0, 18); | |
d26a6aa0 | 1128 | buf[0] = valid | 0x70; /* Valid, current error */ |
d5e2b67a MN |
1129 | buf[2] = SK(sd); |
1130 | put_unaligned_be32(sdinfo, &buf[3]); /* Sense information */ | |
d26a6aa0 | 1131 | buf[7] = 18 - 8; /* Additional sense length */ |
d5e2b67a MN |
1132 | buf[12] = ASC(sd); |
1133 | buf[13] = ASCQ(sd); | |
1134 | return 18; | |
1135 | } | |
1136 | ||
8ea864cf | 1137 | static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1138 | { |
8ea864cf MN |
1139 | struct fsg_lun *curlun = common->curlun; |
1140 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
1141 | int pmi = common->cmnd[8]; | |
b73af61e | 1142 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a MN |
1143 | |
1144 | /* Check the PMI and LBA fields */ | |
1145 | if (pmi > 1 || (pmi == 0 && lba != 0)) { | |
1146 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1147 | return -EINVAL; | |
1148 | } | |
1149 | ||
1150 | put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); | |
1151 | /* Max logical block */ | |
3f565a36 | 1152 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1153 | return 8; |
1154 | } | |
1155 | ||
8ea864cf | 1156 | static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1157 | { |
8ea864cf MN |
1158 | struct fsg_lun *curlun = common->curlun; |
1159 | int msf = common->cmnd[1] & 0x02; | |
1160 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
b73af61e | 1161 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1162 | |
8ea864cf | 1163 | if (common->cmnd[1] & ~0x02) { /* Mask away MSF */ |
d5e2b67a MN |
1164 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1165 | return -EINVAL; | |
1166 | } | |
1167 | if (lba >= curlun->num_sectors) { | |
1168 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1169 | return -EINVAL; | |
1170 | } | |
1171 | ||
1172 | memset(buf, 0, 8); | |
1173 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ | |
1174 | store_cdrom_address(&buf[4], msf, lba); | |
1175 | return 8; | |
1176 | } | |
1177 | ||
8ea864cf | 1178 | static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1179 | { |
8ea864cf MN |
1180 | struct fsg_lun *curlun = common->curlun; |
1181 | int msf = common->cmnd[1] & 0x02; | |
1182 | int start_track = common->cmnd[6]; | |
b73af61e | 1183 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1184 | |
8ea864cf | 1185 | if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ |
d5e2b67a MN |
1186 | start_track > 1) { |
1187 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | ||
1191 | memset(buf, 0, 20); | |
1192 | buf[1] = (20-2); /* TOC data length */ | |
1193 | buf[2] = 1; /* First track number */ | |
1194 | buf[3] = 1; /* Last track number */ | |
1195 | buf[5] = 0x16; /* Data track, copying allowed */ | |
1196 | buf[6] = 0x01; /* Only track is number 1 */ | |
1197 | store_cdrom_address(&buf[8], msf, 0); | |
1198 | ||
1199 | buf[13] = 0x16; /* Lead-out track is data */ | |
1200 | buf[14] = 0xAA; /* Lead-out track number */ | |
1201 | store_cdrom_address(&buf[16], msf, curlun->num_sectors); | |
1202 | return 20; | |
1203 | } | |
1204 | ||
8ea864cf | 1205 | static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1206 | { |
8ea864cf MN |
1207 | struct fsg_lun *curlun = common->curlun; |
1208 | int mscmnd = common->cmnd[0]; | |
d5e2b67a MN |
1209 | u8 *buf = (u8 *) bh->buf; |
1210 | u8 *buf0 = buf; | |
1211 | int pc, page_code; | |
1212 | int changeable_values, all_pages; | |
1213 | int valid_page = 0; | |
1214 | int len, limit; | |
1215 | ||
8ea864cf | 1216 | if ((common->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ |
d5e2b67a MN |
1217 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1218 | return -EINVAL; | |
1219 | } | |
8ea864cf MN |
1220 | pc = common->cmnd[2] >> 6; |
1221 | page_code = common->cmnd[2] & 0x3f; | |
d5e2b67a MN |
1222 | if (pc == 3) { |
1223 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; | |
1224 | return -EINVAL; | |
1225 | } | |
1226 | changeable_values = (pc == 1); | |
1227 | all_pages = (page_code == 0x3f); | |
1228 | ||
b73af61e MN |
1229 | /* |
1230 | * Write the mode parameter header. Fixed values are: default | |
d5e2b67a MN |
1231 | * medium type, no cache control (DPOFUA), and no block descriptors. |
1232 | * The only variable value is the WriteProtect bit. We will fill in | |
b73af61e MN |
1233 | * the mode data length later. |
1234 | */ | |
d5e2b67a | 1235 | memset(buf, 0, 8); |
0a6a717c | 1236 | if (mscmnd == MODE_SENSE) { |
d26a6aa0 | 1237 | buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a MN |
1238 | buf += 4; |
1239 | limit = 255; | |
0a6a717c | 1240 | } else { /* MODE_SENSE_10 */ |
d26a6aa0 | 1241 | buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a | 1242 | buf += 8; |
d26a6aa0 | 1243 | limit = 65535; /* Should really be FSG_BUFLEN */ |
d5e2b67a MN |
1244 | } |
1245 | ||
1246 | /* No block descriptors */ | |
1247 | ||
b73af61e MN |
1248 | /* |
1249 | * The mode pages, in numerical order. The only page we support | |
1250 | * is the Caching page. | |
1251 | */ | |
d5e2b67a MN |
1252 | if (page_code == 0x08 || all_pages) { |
1253 | valid_page = 1; | |
d26a6aa0 MN |
1254 | buf[0] = 0x08; /* Page code */ |
1255 | buf[1] = 10; /* Page length */ | |
1256 | memset(buf+2, 0, 10); /* None of the fields are changeable */ | |
d5e2b67a MN |
1257 | |
1258 | if (!changeable_values) { | |
d26a6aa0 MN |
1259 | buf[2] = 0x04; /* Write cache enable, */ |
1260 | /* Read cache not disabled */ | |
1261 | /* No cache retention priorities */ | |
d5e2b67a MN |
1262 | put_unaligned_be16(0xffff, &buf[4]); |
1263 | /* Don't disable prefetch */ | |
1264 | /* Minimum prefetch = 0 */ | |
1265 | put_unaligned_be16(0xffff, &buf[8]); | |
1266 | /* Maximum prefetch */ | |
1267 | put_unaligned_be16(0xffff, &buf[10]); | |
1268 | /* Maximum prefetch ceiling */ | |
1269 | } | |
1270 | buf += 12; | |
1271 | } | |
1272 | ||
b73af61e MN |
1273 | /* |
1274 | * Check that a valid page was requested and the mode data length | |
1275 | * isn't too long. | |
1276 | */ | |
d5e2b67a MN |
1277 | len = buf - buf0; |
1278 | if (!valid_page || len > limit) { | |
1279 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1280 | return -EINVAL; | |
1281 | } | |
1282 | ||
1283 | /* Store the mode data length */ | |
0a6a717c | 1284 | if (mscmnd == MODE_SENSE) |
d5e2b67a MN |
1285 | buf0[0] = len - 1; |
1286 | else | |
1287 | put_unaligned_be16(len - 2, buf0); | |
1288 | return len; | |
1289 | } | |
1290 | ||
8ea864cf | 1291 | static int do_start_stop(struct fsg_common *common) |
d5e2b67a | 1292 | { |
31436a1a FC |
1293 | struct fsg_lun *curlun = common->curlun; |
1294 | int loej, start; | |
1295 | ||
1296 | if (!curlun) { | |
481e4929 | 1297 | return -EINVAL; |
31436a1a FC |
1298 | } else if (!curlun->removable) { |
1299 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a | 1300 | return -EINVAL; |
8876f5e7 MN |
1301 | } else if ((common->cmnd[1] & ~0x01) != 0 || /* Mask away Immed */ |
1302 | (common->cmnd[4] & ~0x03) != 0) { /* Mask LoEj, Start */ | |
31436a1a FC |
1303 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1304 | return -EINVAL; | |
1305 | } | |
1306 | ||
8876f5e7 MN |
1307 | loej = common->cmnd[4] & 0x02; |
1308 | start = common->cmnd[4] & 0x01; | |
31436a1a | 1309 | |
b73af61e MN |
1310 | /* |
1311 | * Our emulation doesn't support mounting; the medium is | |
1312 | * available for use as soon as it is loaded. | |
1313 | */ | |
8876f5e7 | 1314 | if (start) { |
31436a1a FC |
1315 | if (!fsg_lun_is_open(curlun)) { |
1316 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1317 | return -EINVAL; | |
1318 | } | |
8876f5e7 | 1319 | return 0; |
31436a1a | 1320 | } |
8876f5e7 MN |
1321 | |
1322 | /* Are we allowed to unload the media? */ | |
1323 | if (curlun->prevent_medium_removal) { | |
1324 | LDBG(curlun, "unload attempt prevented\n"); | |
1325 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; | |
1326 | return -EINVAL; | |
1327 | } | |
1328 | ||
1329 | if (!loej) | |
1330 | return 0; | |
1331 | ||
8876f5e7 MN |
1332 | up_read(&common->filesem); |
1333 | down_write(&common->filesem); | |
1334 | fsg_lun_close(curlun); | |
1335 | up_write(&common->filesem); | |
1336 | down_read(&common->filesem); | |
1337 | ||
2b508002 | 1338 | return 0; |
d5e2b67a MN |
1339 | } |
1340 | ||
8ea864cf | 1341 | static int do_prevent_allow(struct fsg_common *common) |
d5e2b67a | 1342 | { |
8ea864cf | 1343 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1344 | int prevent; |
1345 | ||
8ea864cf | 1346 | if (!common->curlun) { |
481e4929 | 1347 | return -EINVAL; |
8ea864cf MN |
1348 | } else if (!common->curlun->removable) { |
1349 | common->curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1350 | return -EINVAL; |
1351 | } | |
1352 | ||
8ea864cf MN |
1353 | prevent = common->cmnd[4] & 0x01; |
1354 | if ((common->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */ | |
d5e2b67a MN |
1355 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1356 | return -EINVAL; | |
1357 | } | |
1358 | ||
1359 | if (curlun->prevent_medium_removal && !prevent) | |
1360 | fsg_lun_fsync_sub(curlun); | |
1361 | curlun->prevent_medium_removal = prevent; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
8ea864cf | 1365 | static int do_read_format_capacities(struct fsg_common *common, |
d5e2b67a MN |
1366 | struct fsg_buffhd *bh) |
1367 | { | |
8ea864cf | 1368 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1369 | u8 *buf = (u8 *) bh->buf; |
1370 | ||
1371 | buf[0] = buf[1] = buf[2] = 0; | |
d26a6aa0 | 1372 | buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ |
d5e2b67a MN |
1373 | buf += 4; |
1374 | ||
1375 | put_unaligned_be32(curlun->num_sectors, &buf[0]); | |
1376 | /* Number of blocks */ | |
3f565a36 | 1377 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1378 | buf[4] = 0x02; /* Current capacity */ |
1379 | return 12; | |
1380 | } | |
1381 | ||
8ea864cf | 1382 | static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1383 | { |
8ea864cf | 1384 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1385 | |
1386 | /* We don't support MODE SELECT */ | |
8ea864cf MN |
1387 | if (curlun) |
1388 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1389 | return -EINVAL; |
1390 | } | |
1391 | ||
1392 | ||
1393 | /*-------------------------------------------------------------------------*/ | |
1394 | ||
1395 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) | |
1396 | { | |
1397 | int rc; | |
1398 | ||
1399 | rc = fsg_set_halt(fsg, fsg->bulk_in); | |
1400 | if (rc == -EAGAIN) | |
1401 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); | |
1402 | while (rc != 0) { | |
1403 | if (rc != -EAGAIN) { | |
1404 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); | |
1405 | rc = 0; | |
1406 | break; | |
1407 | } | |
1408 | ||
1409 | /* Wait for a short time and then try again */ | |
1410 | if (msleep_interruptible(100) != 0) | |
1411 | return -EINTR; | |
1412 | rc = usb_ep_set_halt(fsg->bulk_in); | |
1413 | } | |
1414 | return rc; | |
1415 | } | |
1416 | ||
1417 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) | |
1418 | { | |
1419 | int rc; | |
1420 | ||
1421 | DBG(fsg, "bulk-in set wedge\n"); | |
1422 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1423 | if (rc == -EAGAIN) | |
1424 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); | |
1425 | while (rc != 0) { | |
1426 | if (rc != -EAGAIN) { | |
1427 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); | |
1428 | rc = 0; | |
1429 | break; | |
1430 | } | |
1431 | ||
1432 | /* Wait for a short time and then try again */ | |
1433 | if (msleep_interruptible(100) != 0) | |
1434 | return -EINTR; | |
1435 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1436 | } | |
1437 | return rc; | |
1438 | } | |
1439 | ||
8ea864cf | 1440 | static int throw_away_data(struct fsg_common *common) |
d5e2b67a | 1441 | { |
225785ae | 1442 | struct fsg_buffhd *bh, *bh2; |
d5e2b67a MN |
1443 | u32 amount; |
1444 | int rc; | |
1445 | ||
8ea864cf MN |
1446 | for (bh = common->next_buffhd_to_drain; |
1447 | bh->state != BUF_STATE_EMPTY || common->usb_amount_left > 0; | |
1448 | bh = common->next_buffhd_to_drain) { | |
d5e2b67a | 1449 | |
d5e2b67a | 1450 | /* Try to submit another request if we need one */ |
225785ae AS |
1451 | bh2 = common->next_buffhd_to_fill; |
1452 | if (bh2->state == BUF_STATE_EMPTY && | |
1453 | common->usb_amount_left > 0) { | |
8ea864cf | 1454 | amount = min(common->usb_amount_left, FSG_BUFLEN); |
d5e2b67a | 1455 | |
b73af61e | 1456 | /* |
04eee25b AS |
1457 | * Except at the end of the transfer, amount will be |
1458 | * equal to the buffer size, which is divisible by | |
b73af61e MN |
1459 | * the bulk-out maxpacket size. |
1460 | */ | |
225785ae AS |
1461 | set_bulk_out_req_length(common, bh2, amount); |
1462 | if (!start_out_transfer(common, bh2)) | |
b73af61e | 1463 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf | 1464 | return -EIO; |
225785ae | 1465 | common->next_buffhd_to_fill = bh2->next; |
8ea864cf | 1466 | common->usb_amount_left -= amount; |
d5e2b67a MN |
1467 | continue; |
1468 | } | |
1469 | ||
225785ae AS |
1470 | /* Wait for the data to be received */ |
1471 | rc = sleep_thread(common, false, bh); | |
d5e2b67a MN |
1472 | if (rc) |
1473 | return rc; | |
225785ae AS |
1474 | |
1475 | /* Throw away the data in a filled buffer */ | |
1476 | bh->state = BUF_STATE_EMPTY; | |
1477 | common->next_buffhd_to_drain = bh->next; | |
1478 | ||
1479 | /* A short packet or an error ends everything */ | |
1480 | if (bh->outreq->actual < bh->bulk_out_intended_length || | |
1481 | bh->outreq->status != 0) { | |
1482 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
1483 | return -EINTR; | |
1484 | } | |
d5e2b67a MN |
1485 | } |
1486 | return 0; | |
1487 | } | |
1488 | ||
8ea864cf | 1489 | static int finish_reply(struct fsg_common *common) |
d5e2b67a | 1490 | { |
8ea864cf | 1491 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
1492 | int rc = 0; |
1493 | ||
8ea864cf | 1494 | switch (common->data_dir) { |
d5e2b67a | 1495 | case DATA_DIR_NONE: |
d26a6aa0 | 1496 | break; /* Nothing to send */ |
d5e2b67a | 1497 | |
b73af61e MN |
1498 | /* |
1499 | * If we don't know whether the host wants to read or write, | |
d5e2b67a MN |
1500 | * this must be CB or CBI with an unknown command. We mustn't |
1501 | * try to send or receive any data. So stall both bulk pipes | |
b73af61e MN |
1502 | * if we can and wait for a reset. |
1503 | */ | |
d5e2b67a | 1504 | case DATA_DIR_UNKNOWN: |
8ea864cf MN |
1505 | if (!common->can_stall) { |
1506 | /* Nothing */ | |
1507 | } else if (fsg_is_set(common)) { | |
1508 | fsg_set_halt(common->fsg, common->fsg->bulk_out); | |
1509 | rc = halt_bulk_in_endpoint(common->fsg); | |
1510 | } else { | |
1511 | /* Don't know what to do if common->fsg is NULL */ | |
1512 | rc = -EIO; | |
d5e2b67a MN |
1513 | } |
1514 | break; | |
1515 | ||
1516 | /* All but the last buffer of data must have already been sent */ | |
1517 | case DATA_DIR_TO_HOST: | |
8ea864cf | 1518 | if (common->data_size == 0) { |
93bcf12e | 1519 | /* Nothing to send */ |
d5e2b67a | 1520 | |
ee81b3e0 AS |
1521 | /* Don't know what to do if common->fsg is NULL */ |
1522 | } else if (!fsg_is_set(common)) { | |
1523 | rc = -EIO; | |
1524 | ||
d5e2b67a | 1525 | /* If there's no residue, simply send the last buffer */ |
8ea864cf | 1526 | } else if (common->residue == 0) { |
d5e2b67a | 1527 | bh->inreq->zero = 0; |
fe52f792 | 1528 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1529 | return -EIO; |
1530 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a | 1531 | |
b73af61e | 1532 | /* |
ee81b3e0 AS |
1533 | * For Bulk-only, mark the end of the data with a short |
1534 | * packet. If we are allowed to stall, halt the bulk-in | |
1535 | * endpoint. (Note: This violates the Bulk-Only Transport | |
1536 | * specification, which requires us to pad the data if we | |
1537 | * don't halt the endpoint. Presumably nobody will mind.) | |
b73af61e | 1538 | */ |
ee81b3e0 | 1539 | } else { |
93bcf12e | 1540 | bh->inreq->zero = 1; |
fe52f792 | 1541 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1542 | rc = -EIO; |
1543 | common->next_buffhd_to_fill = bh->next; | |
ee81b3e0 | 1544 | if (common->can_stall) |
8ea864cf | 1545 | rc = halt_bulk_in_endpoint(common->fsg); |
d5e2b67a MN |
1546 | } |
1547 | break; | |
1548 | ||
b73af61e MN |
1549 | /* |
1550 | * We have processed all we want from the data the host has sent. | |
1551 | * There may still be outstanding bulk-out requests. | |
1552 | */ | |
d5e2b67a | 1553 | case DATA_DIR_FROM_HOST: |
8ea864cf | 1554 | if (common->residue == 0) { |
d26a6aa0 | 1555 | /* Nothing to receive */ |
d5e2b67a MN |
1556 | |
1557 | /* Did the host stop sending unexpectedly early? */ | |
8ea864cf MN |
1558 | } else if (common->short_packet_received) { |
1559 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1560 | rc = -EINTR; |
d5e2b67a | 1561 | |
b73af61e MN |
1562 | /* |
1563 | * We haven't processed all the incoming data. Even though | |
d5e2b67a MN |
1564 | * we may be allowed to stall, doing so would cause a race. |
1565 | * The controller may already have ACK'ed all the remaining | |
1566 | * bulk-out packets, in which case the host wouldn't see a | |
1567 | * STALL. Not realizing the endpoint was halted, it wouldn't | |
b73af61e MN |
1568 | * clear the halt -- leading to problems later on. |
1569 | */ | |
d5e2b67a | 1570 | #if 0 |
8ea864cf MN |
1571 | } else if (common->can_stall) { |
1572 | if (fsg_is_set(common)) | |
1573 | fsg_set_halt(common->fsg, | |
1574 | common->fsg->bulk_out); | |
1575 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1576 | rc = -EINTR; |
d5e2b67a MN |
1577 | #endif |
1578 | ||
b73af61e MN |
1579 | /* |
1580 | * We can't stall. Read in the excess data and throw it | |
1581 | * all away. | |
1582 | */ | |
d26a6aa0 | 1583 | } else { |
8ea864cf | 1584 | rc = throw_away_data(common); |
d26a6aa0 | 1585 | } |
d5e2b67a MN |
1586 | break; |
1587 | } | |
1588 | return rc; | |
1589 | } | |
1590 | ||
78db441d | 1591 | static void send_status(struct fsg_common *common) |
d5e2b67a | 1592 | { |
8ea864cf | 1593 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a | 1594 | struct fsg_buffhd *bh; |
93bcf12e | 1595 | struct bulk_cs_wrap *csw; |
d5e2b67a | 1596 | int rc; |
775dafdc | 1597 | u8 status = US_BULK_STAT_OK; |
d5e2b67a MN |
1598 | u32 sd, sdinfo = 0; |
1599 | ||
1600 | /* Wait for the next buffer to become available */ | |
8ea864cf | 1601 | bh = common->next_buffhd_to_fill; |
225785ae AS |
1602 | rc = sleep_thread(common, false, bh); |
1603 | if (rc) | |
1604 | return; | |
d5e2b67a MN |
1605 | |
1606 | if (curlun) { | |
1607 | sd = curlun->sense_data; | |
1608 | sdinfo = curlun->sense_data_info; | |
8ea864cf | 1609 | } else if (common->bad_lun_okay) |
d5e2b67a MN |
1610 | sd = SS_NO_SENSE; |
1611 | else | |
1612 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
1613 | ||
8ea864cf MN |
1614 | if (common->phase_error) { |
1615 | DBG(common, "sending phase-error status\n"); | |
775dafdc | 1616 | status = US_BULK_STAT_PHASE; |
d5e2b67a MN |
1617 | sd = SS_INVALID_COMMAND; |
1618 | } else if (sd != SS_NO_SENSE) { | |
8ea864cf | 1619 | DBG(common, "sending command-failure status\n"); |
775dafdc | 1620 | status = US_BULK_STAT_FAIL; |
8ea864cf | 1621 | VDBG(common, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" |
d5e2b67a MN |
1622 | " info x%x\n", |
1623 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); | |
1624 | } | |
1625 | ||
93bcf12e | 1626 | /* Store and send the Bulk-only CSW */ |
d26a6aa0 | 1627 | csw = (void *)bh->buf; |
d5e2b67a | 1628 | |
775dafdc | 1629 | csw->Signature = cpu_to_le32(US_BULK_CS_SIGN); |
8ea864cf MN |
1630 | csw->Tag = common->tag; |
1631 | csw->Residue = cpu_to_le32(common->residue); | |
93bcf12e | 1632 | csw->Status = status; |
d5e2b67a | 1633 | |
775dafdc | 1634 | bh->inreq->length = US_BULK_CS_WRAP_LEN; |
93bcf12e | 1635 | bh->inreq->zero = 0; |
fe52f792 | 1636 | if (!start_in_transfer(common, bh)) |
8ea864cf | 1637 | /* Don't know what to do if common->fsg is NULL */ |
78db441d | 1638 | return; |
d5e2b67a | 1639 | |
8ea864cf | 1640 | common->next_buffhd_to_fill = bh->next; |
78db441d | 1641 | return; |
d5e2b67a MN |
1642 | } |
1643 | ||
1644 | ||
1645 | /*-------------------------------------------------------------------------*/ | |
1646 | ||
b73af61e MN |
1647 | /* |
1648 | * Check whether the command is properly formed and whether its data size | |
1649 | * and direction agree with the values we already have. | |
1650 | */ | |
8ea864cf | 1651 | static int check_command(struct fsg_common *common, int cmnd_size, |
b73af61e MN |
1652 | enum data_direction data_dir, unsigned int mask, |
1653 | int needs_medium, const char *name) | |
d5e2b67a MN |
1654 | { |
1655 | int i; | |
98f3a1b9 | 1656 | unsigned int lun = common->cmnd[1] >> 5; |
d5e2b67a MN |
1657 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; |
1658 | char hdlen[20]; | |
1659 | struct fsg_lun *curlun; | |
1660 | ||
d5e2b67a | 1661 | hdlen[0] = 0; |
8ea864cf MN |
1662 | if (common->data_dir != DATA_DIR_UNKNOWN) |
1663 | sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir], | |
b73af61e | 1664 | common->data_size); |
8ea864cf | 1665 | VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", |
d26a6aa0 | 1666 | name, cmnd_size, dirletter[(int) data_dir], |
8ea864cf | 1667 | common->data_size_from_cmnd, common->cmnd_size, hdlen); |
d5e2b67a | 1668 | |
b73af61e MN |
1669 | /* |
1670 | * We can't reply at all until we know the correct data direction | |
1671 | * and size. | |
1672 | */ | |
8ea864cf | 1673 | if (common->data_size_from_cmnd == 0) |
d5e2b67a | 1674 | data_dir = DATA_DIR_NONE; |
8ea864cf | 1675 | if (common->data_size < common->data_size_from_cmnd) { |
b73af61e MN |
1676 | /* |
1677 | * Host data size < Device data size is a phase error. | |
8ea864cf | 1678 | * Carry out the command, but only transfer as much as |
b73af61e MN |
1679 | * we are allowed. |
1680 | */ | |
8ea864cf MN |
1681 | common->data_size_from_cmnd = common->data_size; |
1682 | common->phase_error = 1; | |
d5e2b67a | 1683 | } |
8ea864cf MN |
1684 | common->residue = common->data_size; |
1685 | common->usb_amount_left = common->data_size; | |
d5e2b67a MN |
1686 | |
1687 | /* Conflicting data directions is a phase error */ | |
b73af61e | 1688 | if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) { |
8ea864cf | 1689 | common->phase_error = 1; |
d5e2b67a MN |
1690 | return -EINVAL; |
1691 | } | |
1692 | ||
1693 | /* Verify the length of the command itself */ | |
8ea864cf | 1694 | if (cmnd_size != common->cmnd_size) { |
d5e2b67a | 1695 | |
b73af61e MN |
1696 | /* |
1697 | * Special case workaround: There are plenty of buggy SCSI | |
d5e2b67a MN |
1698 | * implementations. Many have issues with cbw->Length |
1699 | * field passing a wrong command size. For those cases we | |
1700 | * always try to work around the problem by using the length | |
1701 | * sent by the host side provided it is at least as large | |
1702 | * as the correct command length. | |
1703 | * Examples of such cases would be MS-Windows, which issues | |
1704 | * REQUEST SENSE with cbw->Length == 12 where it should | |
1705 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and | |
1706 | * REQUEST SENSE with cbw->Length == 10 where it should | |
1707 | * be 6 as well. | |
1708 | */ | |
8ea864cf MN |
1709 | if (cmnd_size <= common->cmnd_size) { |
1710 | DBG(common, "%s is buggy! Expected length %d " | |
a41ae418 | 1711 | "but we got %d\n", name, |
8ea864cf MN |
1712 | cmnd_size, common->cmnd_size); |
1713 | cmnd_size = common->cmnd_size; | |
d5e2b67a | 1714 | } else { |
8ea864cf | 1715 | common->phase_error = 1; |
d5e2b67a MN |
1716 | return -EINVAL; |
1717 | } | |
1718 | } | |
1719 | ||
1720 | /* Check that the LUN values are consistent */ | |
8ea864cf | 1721 | if (common->lun != lun) |
98f3a1b9 | 1722 | DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n", |
8ea864cf | 1723 | common->lun, lun); |
d5e2b67a MN |
1724 | |
1725 | /* Check the LUN */ | |
144974e7 YL |
1726 | curlun = common->curlun; |
1727 | if (curlun) { | |
0a6a717c | 1728 | if (common->cmnd[0] != REQUEST_SENSE) { |
d5e2b67a MN |
1729 | curlun->sense_data = SS_NO_SENSE; |
1730 | curlun->sense_data_info = 0; | |
1731 | curlun->info_valid = 0; | |
1732 | } | |
1733 | } else { | |
8ea864cf | 1734 | common->bad_lun_okay = 0; |
d5e2b67a | 1735 | |
b73af61e MN |
1736 | /* |
1737 | * INQUIRY and REQUEST SENSE commands are explicitly allowed | |
1738 | * to use unsupported LUNs; all others may not. | |
1739 | */ | |
0a6a717c MN |
1740 | if (common->cmnd[0] != INQUIRY && |
1741 | common->cmnd[0] != REQUEST_SENSE) { | |
98f3a1b9 | 1742 | DBG(common, "unsupported LUN %u\n", common->lun); |
d5e2b67a MN |
1743 | return -EINVAL; |
1744 | } | |
1745 | } | |
1746 | ||
b73af61e MN |
1747 | /* |
1748 | * If a unit attention condition exists, only INQUIRY and | |
1749 | * REQUEST SENSE commands are allowed; anything else must fail. | |
1750 | */ | |
d5e2b67a | 1751 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE && |
b73af61e MN |
1752 | common->cmnd[0] != INQUIRY && |
1753 | common->cmnd[0] != REQUEST_SENSE) { | |
d5e2b67a MN |
1754 | curlun->sense_data = curlun->unit_attention_data; |
1755 | curlun->unit_attention_data = SS_NO_SENSE; | |
1756 | return -EINVAL; | |
1757 | } | |
1758 | ||
1759 | /* Check that only command bytes listed in the mask are non-zero */ | |
8ea864cf | 1760 | common->cmnd[1] &= 0x1f; /* Mask away the LUN */ |
d5e2b67a | 1761 | for (i = 1; i < cmnd_size; ++i) { |
8ea864cf | 1762 | if (common->cmnd[i] && !(mask & (1 << i))) { |
d5e2b67a MN |
1763 | if (curlun) |
1764 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1765 | return -EINVAL; | |
1766 | } | |
1767 | } | |
1768 | ||
1769 | /* If the medium isn't mounted and the command needs to access | |
1770 | * it, return an error. */ | |
1771 | if (curlun && !fsg_lun_is_open(curlun) && needs_medium) { | |
1772 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1773 | return -EINVAL; | |
1774 | } | |
1775 | ||
1776 | return 0; | |
1777 | } | |
1778 | ||
144974e7 YL |
1779 | /* wrapper of check_command for data size in blocks handling */ |
1780 | static int check_command_size_in_blocks(struct fsg_common *common, | |
1781 | int cmnd_size, enum data_direction data_dir, | |
1782 | unsigned int mask, int needs_medium, const char *name) | |
1783 | { | |
1784 | if (common->curlun) | |
1785 | common->data_size_from_cmnd <<= common->curlun->blkbits; | |
1786 | return check_command(common, cmnd_size, data_dir, | |
1787 | mask, needs_medium, name); | |
1788 | } | |
1789 | ||
8ea864cf | 1790 | static int do_scsi_command(struct fsg_common *common) |
d5e2b67a MN |
1791 | { |
1792 | struct fsg_buffhd *bh; | |
1793 | int rc; | |
1794 | int reply = -EINVAL; | |
1795 | int i; | |
1796 | static char unknown[16]; | |
1797 | ||
8ea864cf | 1798 | dump_cdb(common); |
d5e2b67a MN |
1799 | |
1800 | /* Wait for the next buffer to become available for data or status */ | |
8ea864cf MN |
1801 | bh = common->next_buffhd_to_fill; |
1802 | common->next_buffhd_to_drain = bh; | |
225785ae AS |
1803 | rc = sleep_thread(common, false, bh); |
1804 | if (rc) | |
1805 | return rc; | |
1806 | ||
8ea864cf MN |
1807 | common->phase_error = 0; |
1808 | common->short_packet_received = 0; | |
d5e2b67a | 1809 | |
8ea864cf MN |
1810 | down_read(&common->filesem); /* We're using the backing file */ |
1811 | switch (common->cmnd[0]) { | |
d5e2b67a | 1812 | |
0a6a717c | 1813 | case INQUIRY: |
8ea864cf MN |
1814 | common->data_size_from_cmnd = common->cmnd[4]; |
1815 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1816 | (1<<4), 0, |
1817 | "INQUIRY"); | |
1818 | if (reply == 0) | |
8ea864cf | 1819 | reply = do_inquiry(common, bh); |
d5e2b67a MN |
1820 | break; |
1821 | ||
0a6a717c | 1822 | case MODE_SELECT: |
8ea864cf MN |
1823 | common->data_size_from_cmnd = common->cmnd[4]; |
1824 | reply = check_command(common, 6, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1825 | (1<<1) | (1<<4), 0, |
1826 | "MODE SELECT(6)"); | |
1827 | if (reply == 0) | |
8ea864cf | 1828 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1829 | break; |
1830 | ||
0a6a717c | 1831 | case MODE_SELECT_10: |
8ea864cf MN |
1832 | common->data_size_from_cmnd = |
1833 | get_unaligned_be16(&common->cmnd[7]); | |
1834 | reply = check_command(common, 10, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1835 | (1<<1) | (3<<7), 0, |
1836 | "MODE SELECT(10)"); | |
1837 | if (reply == 0) | |
8ea864cf | 1838 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1839 | break; |
1840 | ||
0a6a717c | 1841 | case MODE_SENSE: |
8ea864cf MN |
1842 | common->data_size_from_cmnd = common->cmnd[4]; |
1843 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1844 | (1<<1) | (1<<2) | (1<<4), 0, |
1845 | "MODE SENSE(6)"); | |
1846 | if (reply == 0) | |
8ea864cf | 1847 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1848 | break; |
1849 | ||
0a6a717c | 1850 | case MODE_SENSE_10: |
8ea864cf MN |
1851 | common->data_size_from_cmnd = |
1852 | get_unaligned_be16(&common->cmnd[7]); | |
1853 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1854 | (1<<1) | (1<<2) | (3<<7), 0, |
1855 | "MODE SENSE(10)"); | |
1856 | if (reply == 0) | |
8ea864cf | 1857 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1858 | break; |
1859 | ||
0a6a717c | 1860 | case ALLOW_MEDIUM_REMOVAL: |
8ea864cf MN |
1861 | common->data_size_from_cmnd = 0; |
1862 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1863 | (1<<4), 0, |
1864 | "PREVENT-ALLOW MEDIUM REMOVAL"); | |
1865 | if (reply == 0) | |
8ea864cf | 1866 | reply = do_prevent_allow(common); |
d5e2b67a MN |
1867 | break; |
1868 | ||
0a6a717c | 1869 | case READ_6: |
8ea864cf | 1870 | i = common->cmnd[4]; |
144974e7 YL |
1871 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
1872 | reply = check_command_size_in_blocks(common, 6, | |
1873 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1874 | (7<<1) | (1<<4), 1, |
1875 | "READ(6)"); | |
1876 | if (reply == 0) | |
8ea864cf | 1877 | reply = do_read(common); |
d5e2b67a MN |
1878 | break; |
1879 | ||
0a6a717c | 1880 | case READ_10: |
8ea864cf | 1881 | common->data_size_from_cmnd = |
144974e7 YL |
1882 | get_unaligned_be16(&common->cmnd[7]); |
1883 | reply = check_command_size_in_blocks(common, 10, | |
1884 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1885 | (1<<1) | (0xf<<2) | (3<<7), 1, |
1886 | "READ(10)"); | |
1887 | if (reply == 0) | |
8ea864cf | 1888 | reply = do_read(common); |
d5e2b67a MN |
1889 | break; |
1890 | ||
0a6a717c | 1891 | case READ_12: |
8ea864cf | 1892 | common->data_size_from_cmnd = |
144974e7 YL |
1893 | get_unaligned_be32(&common->cmnd[6]); |
1894 | reply = check_command_size_in_blocks(common, 12, | |
1895 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1896 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
1897 | "READ(12)"); | |
1898 | if (reply == 0) | |
8ea864cf | 1899 | reply = do_read(common); |
d5e2b67a MN |
1900 | break; |
1901 | ||
0a6a717c | 1902 | case READ_CAPACITY: |
8ea864cf MN |
1903 | common->data_size_from_cmnd = 8; |
1904 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1905 | (0xf<<2) | (1<<8), 1, |
1906 | "READ CAPACITY"); | |
1907 | if (reply == 0) | |
8ea864cf | 1908 | reply = do_read_capacity(common, bh); |
d5e2b67a MN |
1909 | break; |
1910 | ||
0a6a717c | 1911 | case READ_HEADER: |
8ea864cf | 1912 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1913 | goto unknown_cmnd; |
8ea864cf MN |
1914 | common->data_size_from_cmnd = |
1915 | get_unaligned_be16(&common->cmnd[7]); | |
1916 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1917 | (3<<7) | (0x1f<<1), 1, |
1918 | "READ HEADER"); | |
1919 | if (reply == 0) | |
8ea864cf | 1920 | reply = do_read_header(common, bh); |
d5e2b67a MN |
1921 | break; |
1922 | ||
0a6a717c | 1923 | case READ_TOC: |
8ea864cf | 1924 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1925 | goto unknown_cmnd; |
8ea864cf MN |
1926 | common->data_size_from_cmnd = |
1927 | get_unaligned_be16(&common->cmnd[7]); | |
1928 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1929 | (7<<6) | (1<<1), 1, |
1930 | "READ TOC"); | |
1931 | if (reply == 0) | |
8ea864cf | 1932 | reply = do_read_toc(common, bh); |
d5e2b67a MN |
1933 | break; |
1934 | ||
0a6a717c | 1935 | case READ_FORMAT_CAPACITIES: |
8ea864cf MN |
1936 | common->data_size_from_cmnd = |
1937 | get_unaligned_be16(&common->cmnd[7]); | |
1938 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1939 | (3<<7), 1, |
1940 | "READ FORMAT CAPACITIES"); | |
1941 | if (reply == 0) | |
8ea864cf | 1942 | reply = do_read_format_capacities(common, bh); |
d5e2b67a MN |
1943 | break; |
1944 | ||
0a6a717c | 1945 | case REQUEST_SENSE: |
8ea864cf MN |
1946 | common->data_size_from_cmnd = common->cmnd[4]; |
1947 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1948 | (1<<4), 0, |
1949 | "REQUEST SENSE"); | |
1950 | if (reply == 0) | |
8ea864cf | 1951 | reply = do_request_sense(common, bh); |
d5e2b67a MN |
1952 | break; |
1953 | ||
0a6a717c | 1954 | case START_STOP: |
8ea864cf MN |
1955 | common->data_size_from_cmnd = 0; |
1956 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1957 | (1<<1) | (1<<4), 0, |
1958 | "START-STOP UNIT"); | |
1959 | if (reply == 0) | |
8ea864cf | 1960 | reply = do_start_stop(common); |
d5e2b67a MN |
1961 | break; |
1962 | ||
0a6a717c | 1963 | case SYNCHRONIZE_CACHE: |
8ea864cf MN |
1964 | common->data_size_from_cmnd = 0; |
1965 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
1966 | (0xf<<2) | (3<<7), 1, |
1967 | "SYNCHRONIZE CACHE"); | |
1968 | if (reply == 0) | |
8ea864cf | 1969 | reply = do_synchronize_cache(common); |
d5e2b67a MN |
1970 | break; |
1971 | ||
0a6a717c | 1972 | case TEST_UNIT_READY: |
8ea864cf MN |
1973 | common->data_size_from_cmnd = 0; |
1974 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d5e2b67a MN |
1975 | 0, 1, |
1976 | "TEST UNIT READY"); | |
1977 | break; | |
1978 | ||
b73af61e MN |
1979 | /* |
1980 | * Although optional, this command is used by MS-Windows. We | |
1981 | * support a minimal version: BytChk must be 0. | |
1982 | */ | |
0a6a717c | 1983 | case VERIFY: |
8ea864cf MN |
1984 | common->data_size_from_cmnd = 0; |
1985 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
1986 | (1<<1) | (0xf<<2) | (3<<7), 1, |
1987 | "VERIFY"); | |
1988 | if (reply == 0) | |
8ea864cf | 1989 | reply = do_verify(common); |
d5e2b67a MN |
1990 | break; |
1991 | ||
0a6a717c | 1992 | case WRITE_6: |
8ea864cf | 1993 | i = common->cmnd[4]; |
144974e7 YL |
1994 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
1995 | reply = check_command_size_in_blocks(common, 6, | |
1996 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1997 | (7<<1) | (1<<4), 1, |
1998 | "WRITE(6)"); | |
1999 | if (reply == 0) | |
8ea864cf | 2000 | reply = do_write(common); |
d5e2b67a MN |
2001 | break; |
2002 | ||
0a6a717c | 2003 | case WRITE_10: |
8ea864cf | 2004 | common->data_size_from_cmnd = |
144974e7 YL |
2005 | get_unaligned_be16(&common->cmnd[7]); |
2006 | reply = check_command_size_in_blocks(common, 10, | |
2007 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2008 | (1<<1) | (0xf<<2) | (3<<7), 1, |
2009 | "WRITE(10)"); | |
2010 | if (reply == 0) | |
8ea864cf | 2011 | reply = do_write(common); |
d5e2b67a MN |
2012 | break; |
2013 | ||
0a6a717c | 2014 | case WRITE_12: |
8ea864cf | 2015 | common->data_size_from_cmnd = |
144974e7 YL |
2016 | get_unaligned_be32(&common->cmnd[6]); |
2017 | reply = check_command_size_in_blocks(common, 12, | |
2018 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2019 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
2020 | "WRITE(12)"); | |
2021 | if (reply == 0) | |
8ea864cf | 2022 | reply = do_write(common); |
d5e2b67a MN |
2023 | break; |
2024 | ||
b73af61e MN |
2025 | /* |
2026 | * Some mandatory commands that we recognize but don't implement. | |
d5e2b67a MN |
2027 | * They don't mean much in this setting. It's left as an exercise |
2028 | * for anyone interested to implement RESERVE and RELEASE in terms | |
b73af61e MN |
2029 | * of Posix locks. |
2030 | */ | |
0a6a717c MN |
2031 | case FORMAT_UNIT: |
2032 | case RELEASE: | |
2033 | case RESERVE: | |
2034 | case SEND_DIAGNOSTIC: | |
d26a6aa0 | 2035 | /* Fall through */ |
d5e2b67a MN |
2036 | |
2037 | default: | |
d26a6aa0 | 2038 | unknown_cmnd: |
8ea864cf MN |
2039 | common->data_size_from_cmnd = 0; |
2040 | sprintf(unknown, "Unknown x%02x", common->cmnd[0]); | |
2041 | reply = check_command(common, common->cmnd_size, | |
c85dcdac | 2042 | DATA_DIR_UNKNOWN, ~0, 0, unknown); |
d26a6aa0 | 2043 | if (reply == 0) { |
8ea864cf | 2044 | common->curlun->sense_data = SS_INVALID_COMMAND; |
d5e2b67a MN |
2045 | reply = -EINVAL; |
2046 | } | |
2047 | break; | |
2048 | } | |
8ea864cf | 2049 | up_read(&common->filesem); |
d5e2b67a MN |
2050 | |
2051 | if (reply == -EINTR || signal_pending(current)) | |
2052 | return -EINTR; | |
2053 | ||
2054 | /* Set up the single reply buffer for finish_reply() */ | |
2055 | if (reply == -EINVAL) | |
d26a6aa0 | 2056 | reply = 0; /* Error reply length */ |
8ea864cf | 2057 | if (reply >= 0 && common->data_dir == DATA_DIR_TO_HOST) { |
b73af61e | 2058 | reply = min((u32)reply, common->data_size_from_cmnd); |
d5e2b67a MN |
2059 | bh->inreq->length = reply; |
2060 | bh->state = BUF_STATE_FULL; | |
8ea864cf | 2061 | common->residue -= reply; |
d26a6aa0 | 2062 | } /* Otherwise it's already set */ |
d5e2b67a MN |
2063 | |
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | ||
2068 | /*-------------------------------------------------------------------------*/ | |
2069 | ||
2070 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2071 | { | |
8ea864cf | 2072 | struct usb_request *req = bh->outreq; |
7ac4704c | 2073 | struct bulk_cb_wrap *cbw = req->buf; |
8ea864cf | 2074 | struct fsg_common *common = fsg->common; |
d5e2b67a MN |
2075 | |
2076 | /* Was this a real packet? Should it be ignored? */ | |
2077 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) | |
2078 | return -EINVAL; | |
2079 | ||
2080 | /* Is the CBW valid? */ | |
775dafdc | 2081 | if (req->actual != US_BULK_CB_WRAP_LEN || |
d5e2b67a | 2082 | cbw->Signature != cpu_to_le32( |
775dafdc | 2083 | US_BULK_CB_SIGN)) { |
d5e2b67a MN |
2084 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", |
2085 | req->actual, | |
2086 | le32_to_cpu(cbw->Signature)); | |
2087 | ||
b73af61e MN |
2088 | /* |
2089 | * The Bulk-only spec says we MUST stall the IN endpoint | |
d5e2b67a MN |
2090 | * (6.6.1), so it's unavoidable. It also says we must |
2091 | * retain this state until the next reset, but there's | |
2092 | * no way to tell the controller driver it should ignore | |
2093 | * Clear-Feature(HALT) requests. | |
2094 | * | |
2095 | * We aren't required to halt the OUT endpoint; instead | |
2096 | * we can simply accept and discard any data received | |
b73af61e MN |
2097 | * until the next reset. |
2098 | */ | |
d5e2b67a MN |
2099 | wedge_bulk_in_endpoint(fsg); |
2100 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); | |
2101 | return -EINVAL; | |
2102 | } | |
2103 | ||
2104 | /* Is the CBW meaningful? */ | |
dd02ea5a KO |
2105 | if (cbw->Lun >= ARRAY_SIZE(common->luns) || |
2106 | cbw->Flags & ~US_BULK_FLAG_IN || cbw->Length <= 0 || | |
2107 | cbw->Length > MAX_COMMAND_SIZE) { | |
d5e2b67a MN |
2108 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
2109 | "cmdlen %u\n", | |
2110 | cbw->Lun, cbw->Flags, cbw->Length); | |
2111 | ||
b73af61e MN |
2112 | /* |
2113 | * We can do anything we want here, so let's stall the | |
2114 | * bulk pipes if we are allowed to. | |
2115 | */ | |
8ea864cf | 2116 | if (common->can_stall) { |
d5e2b67a MN |
2117 | fsg_set_halt(fsg, fsg->bulk_out); |
2118 | halt_bulk_in_endpoint(fsg); | |
2119 | } | |
2120 | return -EINVAL; | |
2121 | } | |
2122 | ||
2123 | /* Save the command for later */ | |
8ea864cf MN |
2124 | common->cmnd_size = cbw->Length; |
2125 | memcpy(common->cmnd, cbw->CDB, common->cmnd_size); | |
775dafdc | 2126 | if (cbw->Flags & US_BULK_FLAG_IN) |
8ea864cf | 2127 | common->data_dir = DATA_DIR_TO_HOST; |
d5e2b67a | 2128 | else |
8ea864cf MN |
2129 | common->data_dir = DATA_DIR_FROM_HOST; |
2130 | common->data_size = le32_to_cpu(cbw->DataTransferLength); | |
2131 | if (common->data_size == 0) | |
2132 | common->data_dir = DATA_DIR_NONE; | |
2133 | common->lun = cbw->Lun; | |
dd02ea5a | 2134 | if (common->lun < ARRAY_SIZE(common->luns)) |
8b903fd7 | 2135 | common->curlun = common->luns[common->lun]; |
144974e7 YL |
2136 | else |
2137 | common->curlun = NULL; | |
8ea864cf | 2138 | common->tag = cbw->Tag; |
d5e2b67a MN |
2139 | return 0; |
2140 | } | |
2141 | ||
8ea864cf | 2142 | static int get_next_command(struct fsg_common *common) |
d5e2b67a MN |
2143 | { |
2144 | struct fsg_buffhd *bh; | |
2145 | int rc = 0; | |
2146 | ||
93bcf12e | 2147 | /* Wait for the next buffer to become available */ |
8ea864cf | 2148 | bh = common->next_buffhd_to_fill; |
225785ae AS |
2149 | rc = sleep_thread(common, true, bh); |
2150 | if (rc) | |
2151 | return rc; | |
d5e2b67a | 2152 | |
93bcf12e | 2153 | /* Queue a request to read a Bulk-only CBW */ |
775dafdc | 2154 | set_bulk_out_req_length(common, bh, US_BULK_CB_WRAP_LEN); |
fe52f792 | 2155 | if (!start_out_transfer(common, bh)) |
8ea864cf MN |
2156 | /* Don't know what to do if common->fsg is NULL */ |
2157 | return -EIO; | |
d5e2b67a | 2158 | |
b73af61e MN |
2159 | /* |
2160 | * We will drain the buffer in software, which means we | |
93bcf12e | 2161 | * can reuse it for the next filling. No need to advance |
b73af61e MN |
2162 | * next_buffhd_to_fill. |
2163 | */ | |
d5e2b67a | 2164 | |
93bcf12e | 2165 | /* Wait for the CBW to arrive */ |
225785ae AS |
2166 | rc = sleep_thread(common, true, bh); |
2167 | if (rc) | |
2168 | return rc; | |
2169 | ||
8ea864cf | 2170 | rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO; |
93bcf12e MN |
2171 | bh->state = BUF_STATE_EMPTY; |
2172 | ||
d5e2b67a MN |
2173 | return rc; |
2174 | } | |
2175 | ||
2176 | ||
2177 | /*-------------------------------------------------------------------------*/ | |
2178 | ||
8ea864cf | 2179 | static int alloc_request(struct fsg_common *common, struct usb_ep *ep, |
d5e2b67a MN |
2180 | struct usb_request **preq) |
2181 | { | |
2182 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
2183 | if (*preq) | |
2184 | return 0; | |
8ea864cf | 2185 | ERROR(common, "can't allocate request for %s\n", ep->name); |
d5e2b67a MN |
2186 | return -ENOMEM; |
2187 | } | |
2188 | ||
b894f60a MN |
2189 | /* Reset interface setting and re-init endpoint state (toggle etc). */ |
2190 | static int do_set_interface(struct fsg_common *common, struct fsg_dev *new_fsg) | |
d5e2b67a | 2191 | { |
b894f60a MN |
2192 | struct fsg_dev *fsg; |
2193 | int i, rc = 0; | |
d5e2b67a | 2194 | |
8ea864cf MN |
2195 | if (common->running) |
2196 | DBG(common, "reset interface\n"); | |
d5e2b67a MN |
2197 | |
2198 | reset: | |
2199 | /* Deallocate the requests */ | |
b894f60a MN |
2200 | if (common->fsg) { |
2201 | fsg = common->fsg; | |
8ea864cf | 2202 | |
6fdc5dd2 | 2203 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2204 | struct fsg_buffhd *bh = &common->buffhds[i]; |
d5e2b67a | 2205 | |
8ea864cf MN |
2206 | if (bh->inreq) { |
2207 | usb_ep_free_request(fsg->bulk_in, bh->inreq); | |
2208 | bh->inreq = NULL; | |
2209 | } | |
2210 | if (bh->outreq) { | |
2211 | usb_ep_free_request(fsg->bulk_out, bh->outreq); | |
2212 | bh->outreq = NULL; | |
2213 | } | |
d5e2b67a | 2214 | } |
8ea864cf MN |
2215 | |
2216 | /* Disable the endpoints */ | |
2217 | if (fsg->bulk_in_enabled) { | |
2218 | usb_ep_disable(fsg->bulk_in); | |
2219 | fsg->bulk_in_enabled = 0; | |
2220 | } | |
2221 | if (fsg->bulk_out_enabled) { | |
2222 | usb_ep_disable(fsg->bulk_out); | |
2223 | fsg->bulk_out_enabled = 0; | |
d5e2b67a | 2224 | } |
d5e2b67a | 2225 | |
b894f60a MN |
2226 | common->fsg = NULL; |
2227 | wake_up(&common->fsg_wait); | |
d5e2b67a | 2228 | } |
d5e2b67a | 2229 | |
8ea864cf | 2230 | common->running = 0; |
b894f60a | 2231 | if (!new_fsg || rc) |
d5e2b67a MN |
2232 | return rc; |
2233 | ||
b894f60a MN |
2234 | common->fsg = new_fsg; |
2235 | fsg = common->fsg; | |
d5e2b67a | 2236 | |
b894f60a | 2237 | /* Enable the endpoints */ |
ea2a1df7 TB |
2238 | rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in); |
2239 | if (rc) | |
2240 | goto reset; | |
2241 | rc = usb_ep_enable(fsg->bulk_in); | |
b894f60a MN |
2242 | if (rc) |
2243 | goto reset; | |
ea2a1df7 | 2244 | fsg->bulk_in->driver_data = common; |
b894f60a | 2245 | fsg->bulk_in_enabled = 1; |
8ea864cf | 2246 | |
ea2a1df7 TB |
2247 | rc = config_ep_by_speed(common->gadget, &(fsg->function), |
2248 | fsg->bulk_out); | |
2249 | if (rc) | |
2250 | goto reset; | |
2251 | rc = usb_ep_enable(fsg->bulk_out); | |
b894f60a MN |
2252 | if (rc) |
2253 | goto reset; | |
ea2a1df7 | 2254 | fsg->bulk_out->driver_data = common; |
b894f60a | 2255 | fsg->bulk_out_enabled = 1; |
29cc8897 | 2256 | common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc); |
b894f60a MN |
2257 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
2258 | ||
2259 | /* Allocate the requests */ | |
6fdc5dd2 | 2260 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
b894f60a MN |
2261 | struct fsg_buffhd *bh = &common->buffhds[i]; |
2262 | ||
2263 | rc = alloc_request(common, fsg->bulk_in, &bh->inreq); | |
8ea864cf | 2264 | if (rc) |
d5e2b67a | 2265 | goto reset; |
b894f60a | 2266 | rc = alloc_request(common, fsg->bulk_out, &bh->outreq); |
8ea864cf | 2267 | if (rc) |
d5e2b67a | 2268 | goto reset; |
b894f60a MN |
2269 | bh->inreq->buf = bh->outreq->buf = bh->buf; |
2270 | bh->inreq->context = bh->outreq->context = bh; | |
2271 | bh->inreq->complete = bulk_in_complete; | |
2272 | bh->outreq->complete = bulk_out_complete; | |
8ea864cf | 2273 | } |
d5e2b67a | 2274 | |
b894f60a | 2275 | common->running = 1; |
dd02ea5a | 2276 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) |
8b903fd7 AP |
2277 | if (common->luns[i]) |
2278 | common->luns[i]->unit_attention_data = | |
2279 | SS_RESET_OCCURRED; | |
d5e2b67a MN |
2280 | return rc; |
2281 | } | |
2282 | ||
2283 | ||
d23b0f08 MN |
2284 | /****************************** ALT CONFIGS ******************************/ |
2285 | ||
d23b0f08 MN |
2286 | static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
2287 | { | |
2288 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2289 | fsg->common->new_fsg = fsg; |
8ea864cf | 2290 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
95ed3236 | 2291 | return USB_GADGET_DELAYED_STATUS; |
d23b0f08 MN |
2292 | } |
2293 | ||
2294 | static void fsg_disable(struct usb_function *f) | |
2295 | { | |
2296 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2297 | fsg->common->new_fsg = NULL; |
8ea864cf | 2298 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
d23b0f08 MN |
2299 | } |
2300 | ||
2301 | ||
d5e2b67a MN |
2302 | /*-------------------------------------------------------------------------*/ |
2303 | ||
8ea864cf | 2304 | static void handle_exception(struct fsg_common *common) |
d5e2b67a | 2305 | { |
d5e2b67a | 2306 | int i; |
d5e2b67a MN |
2307 | struct fsg_buffhd *bh; |
2308 | enum fsg_state old_state; | |
d5e2b67a MN |
2309 | struct fsg_lun *curlun; |
2310 | unsigned int exception_req_tag; | |
d5e2b67a | 2311 | |
b73af61e MN |
2312 | /* |
2313 | * Clear the existing signals. Anything but SIGUSR1 is converted | |
2314 | * into a high-priority EXIT exception. | |
2315 | */ | |
d5e2b67a | 2316 | for (;;) { |
be0e6f29 | 2317 | int sig = kernel_dequeue_signal(NULL); |
d5e2b67a MN |
2318 | if (!sig) |
2319 | break; | |
2320 | if (sig != SIGUSR1) { | |
78db441d | 2321 | spin_lock_irq(&common->lock); |
8ea864cf MN |
2322 | if (common->state < FSG_STATE_EXIT) |
2323 | DBG(common, "Main thread exiting on signal\n"); | |
78db441d AS |
2324 | common->state = FSG_STATE_EXIT; |
2325 | spin_unlock_irq(&common->lock); | |
d5e2b67a MN |
2326 | } |
2327 | } | |
2328 | ||
2329 | /* Cancel all the pending transfers */ | |
b894f60a | 2330 | if (likely(common->fsg)) { |
6fdc5dd2 | 2331 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2332 | bh = &common->buffhds[i]; |
225785ae | 2333 | if (bh->state == BUF_STATE_SENDING) |
8ea864cf | 2334 | usb_ep_dequeue(common->fsg->bulk_in, bh->inreq); |
225785ae | 2335 | if (bh->state == BUF_STATE_RECEIVING) |
8ea864cf MN |
2336 | usb_ep_dequeue(common->fsg->bulk_out, |
2337 | bh->outreq); | |
d5e2b67a | 2338 | |
225785ae AS |
2339 | /* Wait for a transfer to become idle */ |
2340 | if (sleep_thread(common, false, bh)) | |
8ea864cf MN |
2341 | return; |
2342 | } | |
2343 | ||
2344 | /* Clear out the controller's fifos */ | |
2345 | if (common->fsg->bulk_in_enabled) | |
2346 | usb_ep_fifo_flush(common->fsg->bulk_in); | |
2347 | if (common->fsg->bulk_out_enabled) | |
2348 | usb_ep_fifo_flush(common->fsg->bulk_out); | |
2349 | } | |
d5e2b67a | 2350 | |
b73af61e MN |
2351 | /* |
2352 | * Reset the I/O buffer states and pointers, the SCSI | |
2353 | * state, and the exception. Then invoke the handler. | |
2354 | */ | |
8ea864cf | 2355 | spin_lock_irq(&common->lock); |
d5e2b67a | 2356 | |
6fdc5dd2 | 2357 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2358 | bh = &common->buffhds[i]; |
d5e2b67a MN |
2359 | bh->state = BUF_STATE_EMPTY; |
2360 | } | |
8ea864cf MN |
2361 | common->next_buffhd_to_fill = &common->buffhds[0]; |
2362 | common->next_buffhd_to_drain = &common->buffhds[0]; | |
2363 | exception_req_tag = common->exception_req_tag; | |
8ea864cf | 2364 | old_state = common->state; |
78db441d | 2365 | common->state = FSG_STATE_NORMAL; |
d5e2b67a | 2366 | |
78db441d | 2367 | if (old_state != FSG_STATE_ABORT_BULK_OUT) { |
dd02ea5a | 2368 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
8b903fd7 AP |
2369 | curlun = common->luns[i]; |
2370 | if (!curlun) | |
2371 | continue; | |
d5e2b67a | 2372 | curlun->prevent_medium_removal = 0; |
d26a6aa0 MN |
2373 | curlun->sense_data = SS_NO_SENSE; |
2374 | curlun->unit_attention_data = SS_NO_SENSE; | |
d5e2b67a MN |
2375 | curlun->sense_data_info = 0; |
2376 | curlun->info_valid = 0; | |
2377 | } | |
d5e2b67a | 2378 | } |
8ea864cf | 2379 | spin_unlock_irq(&common->lock); |
d5e2b67a MN |
2380 | |
2381 | /* Carry out any extra actions required for the exception */ | |
2382 | switch (old_state) { | |
78db441d AS |
2383 | case FSG_STATE_NORMAL: |
2384 | break; | |
2385 | ||
d5e2b67a | 2386 | case FSG_STATE_ABORT_BULK_OUT: |
8ea864cf | 2387 | send_status(common); |
d5e2b67a MN |
2388 | break; |
2389 | ||
78db441d | 2390 | case FSG_STATE_PROTOCOL_RESET: |
b73af61e MN |
2391 | /* |
2392 | * In case we were forced against our will to halt a | |
d5e2b67a | 2393 | * bulk endpoint, clear the halt now. (The SuperH UDC |
b73af61e MN |
2394 | * requires this.) |
2395 | */ | |
8ea864cf MN |
2396 | if (!fsg_is_set(common)) |
2397 | break; | |
2398 | if (test_and_clear_bit(IGNORE_BULK_OUT, | |
2399 | &common->fsg->atomic_bitflags)) | |
2400 | usb_ep_clear_halt(common->fsg->bulk_in); | |
d5e2b67a | 2401 | |
8ea864cf MN |
2402 | if (common->ep0_req_tag == exception_req_tag) |
2403 | ep0_queue(common); /* Complete the status stage */ | |
d5e2b67a | 2404 | |
b73af61e MN |
2405 | /* |
2406 | * Technically this should go here, but it would only be | |
d5e2b67a | 2407 | * a waste of time. Ditto for the INTERFACE_CHANGE and |
b73af61e MN |
2408 | * CONFIG_CHANGE cases. |
2409 | */ | |
dd02ea5a | 2410 | /* for (i = 0; i < common->ARRAY_SIZE(common->luns); ++i) */ |
8b903fd7 AP |
2411 | /* if (common->luns[i]) */ |
2412 | /* common->luns[i]->unit_attention_data = */ | |
2413 | /* SS_RESET_OCCURRED; */ | |
d5e2b67a MN |
2414 | break; |
2415 | ||
d5e2b67a | 2416 | case FSG_STATE_CONFIG_CHANGE: |
b894f60a | 2417 | do_set_interface(common, common->new_fsg); |
95ed3236 RQ |
2418 | if (common->new_fsg) |
2419 | usb_composite_setup_continue(common->cdev); | |
d5e2b67a MN |
2420 | break; |
2421 | ||
d5e2b67a | 2422 | case FSG_STATE_EXIT: |
b894f60a | 2423 | do_set_interface(common, NULL); /* Free resources */ |
8ea864cf MN |
2424 | spin_lock_irq(&common->lock); |
2425 | common->state = FSG_STATE_TERMINATED; /* Stop the thread */ | |
2426 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2427 | break; |
d23b0f08 | 2428 | |
78db441d | 2429 | case FSG_STATE_TERMINATED: |
d23b0f08 | 2430 | break; |
d5e2b67a MN |
2431 | } |
2432 | } | |
2433 | ||
2434 | ||
2435 | /*-------------------------------------------------------------------------*/ | |
2436 | ||
8ea864cf | 2437 | static int fsg_main_thread(void *common_) |
d5e2b67a | 2438 | { |
8ea864cf | 2439 | struct fsg_common *common = common_; |
1fbbb78f | 2440 | int i; |
d5e2b67a | 2441 | |
b73af61e MN |
2442 | /* |
2443 | * Allow the thread to be killed by a signal, but set the signal mask | |
2444 | * to block everything but INT, TERM, KILL, and USR1. | |
2445 | */ | |
d5e2b67a MN |
2446 | allow_signal(SIGINT); |
2447 | allow_signal(SIGTERM); | |
2448 | allow_signal(SIGKILL); | |
2449 | allow_signal(SIGUSR1); | |
2450 | ||
2451 | /* Allow the thread to be frozen */ | |
2452 | set_freezable(); | |
2453 | ||
d5e2b67a | 2454 | /* The main loop */ |
8ea864cf MN |
2455 | while (common->state != FSG_STATE_TERMINATED) { |
2456 | if (exception_in_progress(common) || signal_pending(current)) { | |
2457 | handle_exception(common); | |
d5e2b67a MN |
2458 | continue; |
2459 | } | |
2460 | ||
8ea864cf | 2461 | if (!common->running) { |
225785ae | 2462 | sleep_thread(common, true, NULL); |
d5e2b67a MN |
2463 | continue; |
2464 | } | |
2465 | ||
78db441d | 2466 | if (get_next_command(common) || exception_in_progress(common)) |
d5e2b67a | 2467 | continue; |
78db441d | 2468 | if (do_scsi_command(common) || exception_in_progress(common)) |
d5e2b67a | 2469 | continue; |
78db441d | 2470 | if (finish_reply(common) || exception_in_progress(common)) |
d5e2b67a | 2471 | continue; |
78db441d | 2472 | send_status(common); |
d23b0f08 | 2473 | } |
d5e2b67a | 2474 | |
8ea864cf MN |
2475 | spin_lock_irq(&common->lock); |
2476 | common->thread_task = NULL; | |
2477 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2478 | |
1fbbb78f | 2479 | /* Eject media from all LUNs */ |
7f1ee826 | 2480 | |
1fbbb78f AS |
2481 | down_write(&common->filesem); |
2482 | for (i = 0; i < ARRAY_SIZE(common->luns); i++) { | |
2483 | struct fsg_lun *curlun = common->luns[i]; | |
7f1ee826 | 2484 | |
1fbbb78f | 2485 | if (curlun && fsg_lun_is_open(curlun)) |
7f1ee826 | 2486 | fsg_lun_close(curlun); |
7f1ee826 | 2487 | } |
1fbbb78f | 2488 | up_write(&common->filesem); |
d5e2b67a | 2489 | |
00cb636e | 2490 | /* Let fsg_unbind() know the thread has exited */ |
8ea864cf | 2491 | complete_and_exit(&common->thread_notifier, 0); |
d5e2b67a MN |
2492 | } |
2493 | ||
2494 | ||
9c610213 | 2495 | /*************************** DEVICE ATTRIBUTES ***************************/ |
d5e2b67a | 2496 | |
6fdc5dd2 AP |
2497 | static ssize_t ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
2498 | { | |
77850ae2 AP |
2499 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2500 | ||
2501 | return fsg_show_ro(curlun, buf); | |
6fdc5dd2 AP |
2502 | } |
2503 | ||
2504 | static ssize_t nofua_show(struct device *dev, struct device_attribute *attr, | |
2505 | char *buf) | |
2506 | { | |
77850ae2 AP |
2507 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2508 | ||
2509 | return fsg_show_nofua(curlun, buf); | |
6fdc5dd2 AP |
2510 | } |
2511 | ||
2512 | static ssize_t file_show(struct device *dev, struct device_attribute *attr, | |
2513 | char *buf) | |
2514 | { | |
77850ae2 AP |
2515 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2516 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2517 | ||
2518 | return fsg_show_file(curlun, filesem, buf); | |
6fdc5dd2 AP |
2519 | } |
2520 | ||
2521 | static ssize_t ro_store(struct device *dev, struct device_attribute *attr, | |
2522 | const char *buf, size_t count) | |
2523 | { | |
77850ae2 AP |
2524 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2525 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2526 | ||
2527 | return fsg_store_ro(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2528 | } |
2529 | ||
2530 | static ssize_t nofua_store(struct device *dev, struct device_attribute *attr, | |
2531 | const char *buf, size_t count) | |
2532 | { | |
77850ae2 AP |
2533 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2534 | ||
2535 | return fsg_store_nofua(curlun, buf, count); | |
6fdc5dd2 AP |
2536 | } |
2537 | ||
2538 | static ssize_t file_store(struct device *dev, struct device_attribute *attr, | |
2539 | const char *buf, size_t count) | |
2540 | { | |
77850ae2 AP |
2541 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2542 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2543 | ||
2544 | return fsg_store_file(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2545 | } |
2546 | ||
ce26bd23 | 2547 | static DEVICE_ATTR_RW(nofua); |
c7b364f7 TI |
2548 | /* mode wil be set in fsg_lun_attr_is_visible() */ |
2549 | static DEVICE_ATTR(ro, 0, ro_show, ro_store); | |
2550 | static DEVICE_ATTR(file, 0, file_show, file_store); | |
d5e2b67a | 2551 | |
9c610213 MN |
2552 | /****************************** FSG COMMON ******************************/ |
2553 | ||
2554 | static void fsg_common_release(struct kref *ref); | |
d5e2b67a | 2555 | |
9c610213 | 2556 | static void fsg_lun_release(struct device *dev) |
d5e2b67a | 2557 | { |
9c610213 | 2558 | /* Nothing needs to be done */ |
d5e2b67a MN |
2559 | } |
2560 | ||
f3fed367 | 2561 | void fsg_common_get(struct fsg_common *common) |
d5e2b67a | 2562 | { |
9c610213 | 2563 | kref_get(&common->ref); |
d5e2b67a | 2564 | } |
7a93d040 | 2565 | EXPORT_SYMBOL_GPL(fsg_common_get); |
d5e2b67a | 2566 | |
f3fed367 | 2567 | void fsg_common_put(struct fsg_common *common) |
9c610213 MN |
2568 | { |
2569 | kref_put(&common->ref, fsg_common_release); | |
2570 | } | |
7a93d040 | 2571 | EXPORT_SYMBOL_GPL(fsg_common_put); |
9c610213 | 2572 | |
7a93d040 | 2573 | static struct fsg_common *fsg_common_setup(struct fsg_common *common) |
b24650df AP |
2574 | { |
2575 | if (!common) { | |
2576 | common = kzalloc(sizeof(*common), GFP_KERNEL); | |
2577 | if (!common) | |
2578 | return ERR_PTR(-ENOMEM); | |
2579 | common->free_storage_on_release = 1; | |
2580 | } else { | |
b24650df AP |
2581 | common->free_storage_on_release = 0; |
2582 | } | |
2583 | init_rwsem(&common->filesem); | |
2584 | spin_lock_init(&common->lock); | |
2585 | kref_init(&common->ref); | |
2586 | init_completion(&common->thread_notifier); | |
225785ae | 2587 | init_waitqueue_head(&common->io_wait); |
b24650df AP |
2588 | init_waitqueue_head(&common->fsg_wait); |
2589 | common->state = FSG_STATE_TERMINATED; | |
dd02ea5a | 2590 | memset(common->luns, 0, sizeof(common->luns)); |
b24650df AP |
2591 | |
2592 | return common; | |
2593 | } | |
2594 | ||
bd528d4e AP |
2595 | void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs) |
2596 | { | |
2597 | common->sysfs = sysfs; | |
2598 | } | |
7a93d040 | 2599 | EXPORT_SYMBOL_GPL(fsg_common_set_sysfs); |
bd528d4e | 2600 | |
8502d66d AP |
2601 | static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n) |
2602 | { | |
2603 | if (buffhds) { | |
2604 | struct fsg_buffhd *bh = buffhds; | |
2605 | while (n--) { | |
2606 | kfree(bh->buf); | |
2607 | ++bh; | |
2608 | } | |
2609 | kfree(buffhds); | |
2610 | } | |
2611 | } | |
2612 | ||
6313caac AP |
2613 | int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n) |
2614 | { | |
2615 | struct fsg_buffhd *bh, *buffhds; | |
fe5a6c48 | 2616 | int i; |
6313caac AP |
2617 | |
2618 | buffhds = kcalloc(n, sizeof(*buffhds), GFP_KERNEL); | |
2619 | if (!buffhds) | |
2620 | return -ENOMEM; | |
2621 | ||
2622 | /* Data buffers cyclic list */ | |
2623 | bh = buffhds; | |
2624 | i = n; | |
2625 | goto buffhds_first_it; | |
2626 | do { | |
2627 | bh->next = bh + 1; | |
2628 | ++bh; | |
2629 | buffhds_first_it: | |
2630 | bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL); | |
2631 | if (unlikely(!bh->buf)) | |
2632 | goto error_release; | |
2633 | } while (--i); | |
2634 | bh->next = buffhds; | |
2635 | ||
2636 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2637 | common->fsg_num_buffers = n; | |
2638 | common->buffhds = buffhds; | |
2639 | ||
2640 | return 0; | |
2641 | ||
2642 | error_release: | |
2643 | /* | |
2644 | * "buf"s pointed to by heads after n - i are NULL | |
2645 | * so releasing them won't hurt | |
2646 | */ | |
2647 | _fsg_common_free_buffers(buffhds, n); | |
2648 | ||
2649 | return -ENOMEM; | |
2650 | } | |
7a93d040 | 2651 | EXPORT_SYMBOL_GPL(fsg_common_set_num_buffers); |
6313caac | 2652 | |
5542f58c | 2653 | void fsg_common_remove_lun(struct fsg_lun *lun) |
70634170 | 2654 | { |
5542f58c | 2655 | if (device_is_registered(&lun->dev)) |
70634170 | 2656 | device_unregister(&lun->dev); |
70634170 AP |
2657 | fsg_lun_close(lun); |
2658 | kfree(lun); | |
2659 | } | |
7a93d040 | 2660 | EXPORT_SYMBOL_GPL(fsg_common_remove_lun); |
70634170 AP |
2661 | |
2662 | static void _fsg_common_remove_luns(struct fsg_common *common, int n) | |
2663 | { | |
2664 | int i; | |
2665 | ||
2666 | for (i = 0; i < n; ++i) | |
2667 | if (common->luns[i]) { | |
5542f58c | 2668 | fsg_common_remove_lun(common->luns[i]); |
70634170 AP |
2669 | common->luns[i] = NULL; |
2670 | } | |
2671 | } | |
2672 | ||
2673 | void fsg_common_remove_luns(struct fsg_common *common) | |
2674 | { | |
dd02ea5a | 2675 | _fsg_common_remove_luns(common, ARRAY_SIZE(common->luns)); |
70634170 | 2676 | } |
bab7a1f1 | 2677 | EXPORT_SYMBOL_GPL(fsg_common_remove_luns); |
70634170 | 2678 | |
e5eaa0dc AP |
2679 | void fsg_common_free_buffers(struct fsg_common *common) |
2680 | { | |
2681 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2682 | common->buffhds = NULL; | |
2683 | } | |
7a93d040 | 2684 | EXPORT_SYMBOL_GPL(fsg_common_free_buffers); |
70634170 | 2685 | |
a891d7a3 AP |
2686 | int fsg_common_set_cdev(struct fsg_common *common, |
2687 | struct usb_composite_dev *cdev, bool can_stall) | |
2688 | { | |
2689 | struct usb_string *us; | |
2690 | ||
2691 | common->gadget = cdev->gadget; | |
2692 | common->ep0 = cdev->gadget->ep0; | |
2693 | common->ep0req = cdev->req; | |
2694 | common->cdev = cdev; | |
2695 | ||
2696 | us = usb_gstrings_attach(cdev, fsg_strings_array, | |
2697 | ARRAY_SIZE(fsg_strings)); | |
2698 | if (IS_ERR(us)) | |
2699 | return PTR_ERR(us); | |
2700 | ||
2701 | fsg_intf_desc.iInterface = us[FSG_STRING_INTERFACE].id; | |
2702 | ||
2703 | /* | |
2704 | * Some peripheral controllers are known not to be able to | |
2705 | * halt bulk endpoints correctly. If one of them is present, | |
2706 | * disable stalls. | |
2707 | */ | |
a4cc4215 RB |
2708 | common->can_stall = can_stall && |
2709 | gadget_is_stall_supported(common->gadget); | |
a891d7a3 AP |
2710 | |
2711 | return 0; | |
2712 | } | |
7a93d040 | 2713 | EXPORT_SYMBOL_GPL(fsg_common_set_cdev); |
a891d7a3 | 2714 | |
c7b364f7 TI |
2715 | static struct attribute *fsg_lun_dev_attrs[] = { |
2716 | &dev_attr_ro.attr, | |
2717 | &dev_attr_file.attr, | |
2718 | &dev_attr_nofua.attr, | |
2719 | NULL | |
2720 | }; | |
b27c08c9 | 2721 | |
c7b364f7 TI |
2722 | static umode_t fsg_lun_dev_is_visible(struct kobject *kobj, |
2723 | struct attribute *attr, int idx) | |
2724 | { | |
2725 | struct device *dev = kobj_to_dev(kobj); | |
2726 | struct fsg_lun *lun = fsg_lun_from_dev(dev); | |
b27c08c9 | 2727 | |
c7b364f7 TI |
2728 | if (attr == &dev_attr_ro.attr) |
2729 | return lun->cdrom ? S_IRUGO : (S_IWUSR | S_IRUGO); | |
2730 | if (attr == &dev_attr_file.attr) | |
2731 | return lun->removable ? (S_IWUSR | S_IRUGO) : S_IRUGO; | |
2732 | return attr->mode; | |
2733 | } | |
b27c08c9 | 2734 | |
c7b364f7 TI |
2735 | static const struct attribute_group fsg_lun_dev_group = { |
2736 | .attrs = fsg_lun_dev_attrs, | |
2737 | .is_visible = fsg_lun_dev_is_visible, | |
2738 | }; | |
b27c08c9 | 2739 | |
c7b364f7 TI |
2740 | static const struct attribute_group *fsg_lun_dev_groups[] = { |
2741 | &fsg_lun_dev_group, | |
2742 | NULL | |
2743 | }; | |
b27c08c9 AP |
2744 | |
2745 | int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg, | |
2746 | unsigned int id, const char *name, | |
2747 | const char **name_pfx) | |
2748 | { | |
2749 | struct fsg_lun *lun; | |
2750 | char *pathbuf, *p; | |
2751 | int rc = -ENOMEM; | |
2752 | ||
dd02ea5a | 2753 | if (id >= ARRAY_SIZE(common->luns)) |
b27c08c9 AP |
2754 | return -ENODEV; |
2755 | ||
2756 | if (common->luns[id]) | |
2757 | return -EBUSY; | |
2758 | ||
2759 | if (!cfg->filename && !cfg->removable) { | |
2760 | pr_err("no file given for LUN%d\n", id); | |
2761 | return -EINVAL; | |
2762 | } | |
2763 | ||
2764 | lun = kzalloc(sizeof(*lun), GFP_KERNEL); | |
2765 | if (!lun) | |
2766 | return -ENOMEM; | |
2767 | ||
2768 | lun->name_pfx = name_pfx; | |
2769 | ||
2770 | lun->cdrom = !!cfg->cdrom; | |
2771 | lun->ro = cfg->cdrom || cfg->ro; | |
2772 | lun->initially_ro = lun->ro; | |
2773 | lun->removable = !!cfg->removable; | |
2774 | ||
2775 | if (!common->sysfs) { | |
2776 | /* we DON'T own the name!*/ | |
2777 | lun->name = name; | |
2778 | } else { | |
2779 | lun->dev.release = fsg_lun_release; | |
2780 | lun->dev.parent = &common->gadget->dev; | |
c7b364f7 | 2781 | lun->dev.groups = fsg_lun_dev_groups; |
b27c08c9 | 2782 | dev_set_drvdata(&lun->dev, &common->filesem); |
a1924d8a | 2783 | dev_set_name(&lun->dev, "%s", name); |
b27c08c9 AP |
2784 | lun->name = dev_name(&lun->dev); |
2785 | ||
c7b364f7 | 2786 | rc = device_register(&lun->dev); |
b27c08c9 AP |
2787 | if (rc) { |
2788 | pr_info("failed to register LUN%d: %d\n", id, rc); | |
c7b364f7 | 2789 | put_device(&lun->dev); |
b27c08c9 AP |
2790 | goto error_sysfs; |
2791 | } | |
2792 | } | |
2793 | ||
2794 | common->luns[id] = lun; | |
2795 | ||
2796 | if (cfg->filename) { | |
2797 | rc = fsg_lun_open(lun, cfg->filename); | |
2798 | if (rc) | |
2799 | goto error_lun; | |
2800 | } | |
2801 | ||
2802 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); | |
2803 | p = "(no medium)"; | |
2804 | if (fsg_lun_is_open(lun)) { | |
2805 | p = "(error)"; | |
2806 | if (pathbuf) { | |
9bf39ab2 | 2807 | p = file_path(lun->filp, pathbuf, PATH_MAX); |
b27c08c9 AP |
2808 | if (IS_ERR(p)) |
2809 | p = "(error)"; | |
2810 | } | |
2811 | } | |
2812 | pr_info("LUN: %s%s%sfile: %s\n", | |
2813 | lun->removable ? "removable " : "", | |
2814 | lun->ro ? "read only " : "", | |
2815 | lun->cdrom ? "CD-ROM " : "", | |
2816 | p); | |
2817 | kfree(pathbuf); | |
2818 | ||
2819 | return 0; | |
2820 | ||
2821 | error_lun: | |
5542f58c | 2822 | if (device_is_registered(&lun->dev)) |
b27c08c9 | 2823 | device_unregister(&lun->dev); |
b27c08c9 AP |
2824 | fsg_lun_close(lun); |
2825 | common->luns[id] = NULL; | |
2826 | error_sysfs: | |
2827 | kfree(lun); | |
2828 | return rc; | |
2829 | } | |
7a93d040 | 2830 | EXPORT_SYMBOL_GPL(fsg_common_create_lun); |
b27c08c9 AP |
2831 | |
2832 | int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg) | |
2833 | { | |
2834 | char buf[8]; /* enough for 100000000 different numbers, decimal */ | |
2835 | int i, rc; | |
2836 | ||
dd02ea5a KO |
2837 | fsg_common_remove_luns(common); |
2838 | ||
2839 | for (i = 0; i < cfg->nluns; ++i) { | |
b27c08c9 AP |
2840 | snprintf(buf, sizeof(buf), "lun%d", i); |
2841 | rc = fsg_common_create_lun(common, &cfg->luns[i], i, buf, NULL); | |
2842 | if (rc) | |
2843 | goto fail; | |
2844 | } | |
2845 | ||
dd02ea5a | 2846 | pr_info("Number of LUNs=%d\n", cfg->nluns); |
b27c08c9 AP |
2847 | |
2848 | return 0; | |
2849 | ||
2850 | fail: | |
2851 | _fsg_common_remove_luns(common, i); | |
2852 | return rc; | |
2853 | } | |
7a93d040 | 2854 | EXPORT_SYMBOL_GPL(fsg_common_create_luns); |
b27c08c9 | 2855 | |
23682e3c AP |
2856 | void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn, |
2857 | const char *pn) | |
2858 | { | |
2859 | int i; | |
2860 | ||
2861 | /* Prepare inquiryString */ | |
2862 | i = get_default_bcdDevice(); | |
2863 | snprintf(common->inquiry_string, sizeof(common->inquiry_string), | |
2864 | "%-8s%-16s%04x", vn ?: "Linux", | |
2865 | /* Assume product name dependent on the first LUN */ | |
2866 | pn ?: ((*common->luns)->cdrom | |
2867 | ? "File-CD Gadget" | |
2868 | : "File-Stor Gadget"), | |
2869 | i); | |
2870 | } | |
7a93d040 | 2871 | EXPORT_SYMBOL_GPL(fsg_common_set_inquiry_string); |
23682e3c | 2872 | |
9c610213 MN |
2873 | static void fsg_common_release(struct kref *ref) |
2874 | { | |
b9e00088 | 2875 | struct fsg_common *common = container_of(ref, struct fsg_common, ref); |
dd02ea5a | 2876 | int i; |
9c610213 | 2877 | |
8ea864cf MN |
2878 | /* If the thread isn't already dead, tell it to exit now */ |
2879 | if (common->state != FSG_STATE_TERMINATED) { | |
2880 | raise_exception(common, FSG_STATE_EXIT); | |
2881 | wait_for_completion(&common->thread_notifier); | |
8ea864cf MN |
2882 | } |
2883 | ||
dd02ea5a KO |
2884 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
2885 | struct fsg_lun *lun = common->luns[i]; | |
2886 | if (!lun) | |
2887 | continue; | |
2888 | fsg_lun_close(lun); | |
5542f58c | 2889 | if (device_is_registered(&lun->dev)) |
dd02ea5a KO |
2890 | device_unregister(&lun->dev); |
2891 | kfree(lun); | |
9c610213 MN |
2892 | } |
2893 | ||
8502d66d | 2894 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); |
9c610213 MN |
2895 | if (common->free_storage_on_release) |
2896 | kfree(common); | |
2897 | } | |
2898 | ||
2899 | ||
2900 | /*-------------------------------------------------------------------------*/ | |
2901 | ||
28824b18 | 2902 | static int fsg_bind(struct usb_configuration *c, struct usb_function *f) |
d5e2b67a | 2903 | { |
d23b0f08 | 2904 | struct fsg_dev *fsg = fsg_from_func(f); |
dd02ea5a | 2905 | struct fsg_common *common = fsg->common; |
d23b0f08 | 2906 | struct usb_gadget *gadget = c->cdev->gadget; |
d5e2b67a | 2907 | int i; |
d5e2b67a | 2908 | struct usb_ep *ep; |
10287bae SAS |
2909 | unsigned max_burst; |
2910 | int ret; | |
e5eaa0dc | 2911 | struct fsg_opts *opts; |
7a93d040 | 2912 | |
dd02ea5a KO |
2913 | /* Don't allow to bind if we don't have at least one LUN */ |
2914 | ret = _fsg_common_get_max_lun(common); | |
2915 | if (ret < 0) { | |
2916 | pr_err("There should be at least one LUN.\n"); | |
2917 | return -EINVAL; | |
2918 | } | |
2919 | ||
e5eaa0dc AP |
2920 | opts = fsg_opts_from_func_inst(f->fi); |
2921 | if (!opts->no_configfs) { | |
2922 | ret = fsg_common_set_cdev(fsg->common, c->cdev, | |
2923 | fsg->common->can_stall); | |
2924 | if (ret) | |
2925 | return ret; | |
f91d2f43 | 2926 | fsg_common_set_inquiry_string(fsg->common, NULL, NULL); |
f78bbcae MN |
2927 | } |
2928 | ||
2929 | if (!common->thread_task) { | |
78db441d | 2930 | common->state = FSG_STATE_NORMAL; |
f78bbcae MN |
2931 | common->thread_task = |
2932 | kthread_create(fsg_main_thread, common, "file-storage"); | |
2933 | if (IS_ERR(common->thread_task)) { | |
78db441d | 2934 | ret = PTR_ERR(common->thread_task); |
f78bbcae MN |
2935 | common->thread_task = NULL; |
2936 | common->state = FSG_STATE_TERMINATED; | |
e5eaa0dc | 2937 | return ret; |
f78bbcae MN |
2938 | } |
2939 | DBG(common, "I/O thread pid: %d\n", | |
2940 | task_pid_nr(common->thread_task)); | |
2941 | wake_up_process(common->thread_task); | |
e5eaa0dc | 2942 | } |
e5eaa0dc | 2943 | |
d5e2b67a | 2944 | fsg->gadget = gadget; |
d5e2b67a | 2945 | |
d23b0f08 MN |
2946 | /* New interface */ |
2947 | i = usb_interface_id(c, f); | |
2948 | if (i < 0) | |
8078f314 | 2949 | goto fail; |
d23b0f08 MN |
2950 | fsg_intf_desc.bInterfaceNumber = i; |
2951 | fsg->interface_number = i; | |
d5e2b67a | 2952 | |
d5e2b67a | 2953 | /* Find all the endpoints we will use */ |
d5e2b67a MN |
2954 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); |
2955 | if (!ep) | |
2956 | goto autoconf_fail; | |
d5e2b67a MN |
2957 | fsg->bulk_in = ep; |
2958 | ||
2959 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc); | |
2960 | if (!ep) | |
2961 | goto autoconf_fail; | |
d5e2b67a MN |
2962 | fsg->bulk_out = ep; |
2963 | ||
10287bae SAS |
2964 | /* Assume endpoint addresses are the same for both speeds */ |
2965 | fsg_hs_bulk_in_desc.bEndpointAddress = | |
2966 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
2967 | fsg_hs_bulk_out_desc.bEndpointAddress = | |
2968 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
4bb99b7c | 2969 | |
10287bae SAS |
2970 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
2971 | max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15); | |
4bb99b7c | 2972 | |
10287bae SAS |
2973 | fsg_ss_bulk_in_desc.bEndpointAddress = |
2974 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
2975 | fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 2976 | |
10287bae SAS |
2977 | fsg_ss_bulk_out_desc.bEndpointAddress = |
2978 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
2979 | fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 2980 | |
10287bae | 2981 | ret = usb_assign_descriptors(f, fsg_fs_function, fsg_hs_function, |
59a3cedf | 2982 | fsg_ss_function, fsg_ss_function); |
10287bae SAS |
2983 | if (ret) |
2984 | goto autoconf_fail; | |
4bb99b7c | 2985 | |
d5e2b67a MN |
2986 | return 0; |
2987 | ||
2988 | autoconf_fail: | |
2989 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); | |
8078f314 SSR |
2990 | i = -ENOTSUPP; |
2991 | fail: | |
2992 | /* terminate the thread */ | |
2993 | if (fsg->common->state != FSG_STATE_TERMINATED) { | |
2994 | raise_exception(fsg->common, FSG_STATE_EXIT); | |
2995 | wait_for_completion(&fsg->common->thread_notifier); | |
2996 | } | |
2997 | return i; | |
d5e2b67a MN |
2998 | } |
2999 | ||
e5eaa0dc AP |
3000 | /****************************** ALLOCATE FUNCTION *************************/ |
3001 | ||
3002 | static void fsg_unbind(struct usb_configuration *c, struct usb_function *f) | |
3003 | { | |
3004 | struct fsg_dev *fsg = fsg_from_func(f); | |
3005 | struct fsg_common *common = fsg->common; | |
3006 | ||
3007 | DBG(fsg, "unbind\n"); | |
3008 | if (fsg->common->fsg == fsg) { | |
3009 | fsg->common->new_fsg = NULL; | |
3010 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); | |
3011 | /* FIXME: make interruptible or killable somehow? */ | |
3012 | wait_event(common->fsg_wait, common->fsg != fsg); | |
3013 | } | |
3014 | ||
e5eaa0dc | 3015 | usb_free_all_descriptors(&fsg->function); |
d5e2b67a | 3016 | } |
481e4929 | 3017 | |
ef0aa4b9 AP |
3018 | static inline struct fsg_lun_opts *to_fsg_lun_opts(struct config_item *item) |
3019 | { | |
3020 | return container_of(to_config_group(item), struct fsg_lun_opts, group); | |
3021 | } | |
3022 | ||
3023 | static inline struct fsg_opts *to_fsg_opts(struct config_item *item) | |
3024 | { | |
3025 | return container_of(to_config_group(item), struct fsg_opts, | |
3026 | func_inst.group); | |
3027 | } | |
3028 | ||
ef0aa4b9 AP |
3029 | static void fsg_lun_attr_release(struct config_item *item) |
3030 | { | |
3031 | struct fsg_lun_opts *lun_opts; | |
3032 | ||
3033 | lun_opts = to_fsg_lun_opts(item); | |
3034 | kfree(lun_opts); | |
3035 | } | |
3036 | ||
3037 | static struct configfs_item_operations fsg_lun_item_ops = { | |
5bb7289d | 3038 | .release = fsg_lun_attr_release, |
ef0aa4b9 AP |
3039 | }; |
3040 | ||
4a90cb20 | 3041 | static ssize_t fsg_lun_opts_file_show(struct config_item *item, char *page) |
ef0aa4b9 | 3042 | { |
4a90cb20 CH |
3043 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3044 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3045 | |
3046 | return fsg_show_file(opts->lun, &fsg_opts->common->filesem, page); | |
3047 | } | |
3048 | ||
4a90cb20 | 3049 | static ssize_t fsg_lun_opts_file_store(struct config_item *item, |
ef0aa4b9 AP |
3050 | const char *page, size_t len) |
3051 | { | |
4a90cb20 CH |
3052 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3053 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3054 | |
3055 | return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len); | |
3056 | } | |
3057 | ||
4a90cb20 | 3058 | CONFIGFS_ATTR(fsg_lun_opts_, file); |
ef0aa4b9 | 3059 | |
4a90cb20 | 3060 | static ssize_t fsg_lun_opts_ro_show(struct config_item *item, char *page) |
ef0aa4b9 | 3061 | { |
4a90cb20 | 3062 | return fsg_show_ro(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3063 | } |
3064 | ||
4a90cb20 | 3065 | static ssize_t fsg_lun_opts_ro_store(struct config_item *item, |
ef0aa4b9 AP |
3066 | const char *page, size_t len) |
3067 | { | |
4a90cb20 CH |
3068 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3069 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3070 | |
3071 | return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len); | |
3072 | } | |
3073 | ||
4a90cb20 | 3074 | CONFIGFS_ATTR(fsg_lun_opts_, ro); |
ef0aa4b9 | 3075 | |
4a90cb20 | 3076 | static ssize_t fsg_lun_opts_removable_show(struct config_item *item, |
ef0aa4b9 AP |
3077 | char *page) |
3078 | { | |
4a90cb20 | 3079 | return fsg_show_removable(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3080 | } |
3081 | ||
4a90cb20 | 3082 | static ssize_t fsg_lun_opts_removable_store(struct config_item *item, |
ef0aa4b9 AP |
3083 | const char *page, size_t len) |
3084 | { | |
4a90cb20 | 3085 | return fsg_store_removable(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3086 | } |
3087 | ||
4a90cb20 | 3088 | CONFIGFS_ATTR(fsg_lun_opts_, removable); |
ef0aa4b9 | 3089 | |
4a90cb20 | 3090 | static ssize_t fsg_lun_opts_cdrom_show(struct config_item *item, char *page) |
ef0aa4b9 | 3091 | { |
4a90cb20 | 3092 | return fsg_show_cdrom(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3093 | } |
3094 | ||
4a90cb20 | 3095 | static ssize_t fsg_lun_opts_cdrom_store(struct config_item *item, |
ef0aa4b9 AP |
3096 | const char *page, size_t len) |
3097 | { | |
4a90cb20 CH |
3098 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3099 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
b8798636 AP |
3100 | |
3101 | return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page, | |
3102 | len); | |
ef0aa4b9 AP |
3103 | } |
3104 | ||
4a90cb20 | 3105 | CONFIGFS_ATTR(fsg_lun_opts_, cdrom); |
ef0aa4b9 | 3106 | |
4a90cb20 | 3107 | static ssize_t fsg_lun_opts_nofua_show(struct config_item *item, char *page) |
ef0aa4b9 | 3108 | { |
4a90cb20 | 3109 | return fsg_show_nofua(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3110 | } |
3111 | ||
4a90cb20 | 3112 | static ssize_t fsg_lun_opts_nofua_store(struct config_item *item, |
ef0aa4b9 AP |
3113 | const char *page, size_t len) |
3114 | { | |
4a90cb20 | 3115 | return fsg_store_nofua(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3116 | } |
3117 | ||
4a90cb20 | 3118 | CONFIGFS_ATTR(fsg_lun_opts_, nofua); |
ef0aa4b9 | 3119 | |
6ac47090 PG |
3120 | static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item, |
3121 | char *page) | |
3122 | { | |
3123 | return fsg_show_inquiry_string(to_fsg_lun_opts(item)->lun, page); | |
3124 | } | |
3125 | ||
3126 | static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item, | |
3127 | const char *page, size_t len) | |
3128 | { | |
3129 | return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len); | |
3130 | } | |
3131 | ||
3132 | CONFIGFS_ATTR(fsg_lun_opts_, inquiry_string); | |
3133 | ||
ef0aa4b9 | 3134 | static struct configfs_attribute *fsg_lun_attrs[] = { |
4a90cb20 CH |
3135 | &fsg_lun_opts_attr_file, |
3136 | &fsg_lun_opts_attr_ro, | |
3137 | &fsg_lun_opts_attr_removable, | |
3138 | &fsg_lun_opts_attr_cdrom, | |
3139 | &fsg_lun_opts_attr_nofua, | |
6ac47090 | 3140 | &fsg_lun_opts_attr_inquiry_string, |
ef0aa4b9 AP |
3141 | NULL, |
3142 | }; | |
3143 | ||
3144 | static struct config_item_type fsg_lun_type = { | |
3145 | .ct_item_ops = &fsg_lun_item_ops, | |
3146 | .ct_attrs = fsg_lun_attrs, | |
3147 | .ct_owner = THIS_MODULE, | |
3148 | }; | |
3149 | ||
ef0aa4b9 AP |
3150 | static struct config_group *fsg_lun_make(struct config_group *group, |
3151 | const char *name) | |
3152 | { | |
3153 | struct fsg_lun_opts *opts; | |
3154 | struct fsg_opts *fsg_opts; | |
3155 | struct fsg_lun_config config; | |
3156 | char *num_str; | |
3157 | u8 num; | |
3158 | int ret; | |
3159 | ||
3160 | num_str = strchr(name, '.'); | |
3161 | if (!num_str) { | |
3162 | pr_err("Unable to locate . in LUN.NUMBER\n"); | |
3163 | return ERR_PTR(-EINVAL); | |
3164 | } | |
3165 | num_str++; | |
3166 | ||
3167 | ret = kstrtou8(num_str, 0, &num); | |
3168 | if (ret) | |
3169 | return ERR_PTR(ret); | |
3170 | ||
3171 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3172 | if (num >= FSG_MAX_LUNS) | |
5bb7289d AP |
3173 | return ERR_PTR(-ERANGE); |
3174 | ||
ef0aa4b9 AP |
3175 | mutex_lock(&fsg_opts->lock); |
3176 | if (fsg_opts->refcnt || fsg_opts->common->luns[num]) { | |
3177 | ret = -EBUSY; | |
3178 | goto out; | |
3179 | } | |
3180 | ||
3181 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3182 | if (!opts) { | |
3183 | ret = -ENOMEM; | |
3184 | goto out; | |
3185 | } | |
3186 | ||
3187 | memset(&config, 0, sizeof(config)); | |
3188 | config.removable = true; | |
3189 | ||
ef0aa4b9 AP |
3190 | ret = fsg_common_create_lun(fsg_opts->common, &config, num, name, |
3191 | (const char **)&group->cg_item.ci_name); | |
3192 | if (ret) { | |
3193 | kfree(opts); | |
3194 | goto out; | |
3195 | } | |
3196 | opts->lun = fsg_opts->common->luns[num]; | |
3197 | opts->lun_id = num; | |
3198 | mutex_unlock(&fsg_opts->lock); | |
3199 | ||
3200 | config_group_init_type_name(&opts->group, name, &fsg_lun_type); | |
3201 | ||
3202 | return &opts->group; | |
3203 | out: | |
3204 | mutex_unlock(&fsg_opts->lock); | |
3205 | return ERR_PTR(ret); | |
3206 | } | |
3207 | ||
3208 | static void fsg_lun_drop(struct config_group *group, struct config_item *item) | |
3209 | { | |
3210 | struct fsg_lun_opts *lun_opts; | |
3211 | struct fsg_opts *fsg_opts; | |
3212 | ||
3213 | lun_opts = to_fsg_lun_opts(item); | |
3214 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3215 | ||
3216 | mutex_lock(&fsg_opts->lock); | |
3217 | if (fsg_opts->refcnt) { | |
3218 | struct config_item *gadget; | |
3219 | ||
3220 | gadget = group->cg_item.ci_parent->ci_parent; | |
3221 | unregister_gadget_item(gadget); | |
3222 | } | |
3223 | ||
5542f58c | 3224 | fsg_common_remove_lun(lun_opts->lun); |
ef0aa4b9 AP |
3225 | fsg_opts->common->luns[lun_opts->lun_id] = NULL; |
3226 | lun_opts->lun_id = 0; | |
3227 | mutex_unlock(&fsg_opts->lock); | |
3228 | ||
3229 | config_item_put(item); | |
3230 | } | |
3231 | ||
ef0aa4b9 AP |
3232 | static void fsg_attr_release(struct config_item *item) |
3233 | { | |
3234 | struct fsg_opts *opts = to_fsg_opts(item); | |
3235 | ||
3236 | usb_put_function_instance(&opts->func_inst); | |
3237 | } | |
3238 | ||
3239 | static struct configfs_item_operations fsg_item_ops = { | |
5bb7289d | 3240 | .release = fsg_attr_release, |
ef0aa4b9 AP |
3241 | }; |
3242 | ||
4a90cb20 | 3243 | static ssize_t fsg_opts_stall_show(struct config_item *item, char *page) |
ef0aa4b9 | 3244 | { |
4a90cb20 | 3245 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3246 | int result; |
3247 | ||
3248 | mutex_lock(&opts->lock); | |
3249 | result = sprintf(page, "%d", opts->common->can_stall); | |
3250 | mutex_unlock(&opts->lock); | |
3251 | ||
3252 | return result; | |
3253 | } | |
3254 | ||
4a90cb20 | 3255 | static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page, |
ef0aa4b9 AP |
3256 | size_t len) |
3257 | { | |
4a90cb20 | 3258 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 | 3259 | int ret; |
5bb7289d | 3260 | bool stall; |
ef0aa4b9 AP |
3261 | |
3262 | mutex_lock(&opts->lock); | |
5bb7289d | 3263 | |
ef0aa4b9 | 3264 | if (opts->refcnt) { |
5bb7289d AP |
3265 | mutex_unlock(&opts->lock); |
3266 | return -EBUSY; | |
ef0aa4b9 | 3267 | } |
ef0aa4b9 | 3268 | |
5bb7289d AP |
3269 | ret = strtobool(page, &stall); |
3270 | if (!ret) { | |
3271 | opts->common->can_stall = stall; | |
3272 | ret = len; | |
3273 | } | |
ef0aa4b9 | 3274 | |
ef0aa4b9 | 3275 | mutex_unlock(&opts->lock); |
5bb7289d | 3276 | |
ef0aa4b9 AP |
3277 | return ret; |
3278 | } | |
3279 | ||
4a90cb20 | 3280 | CONFIGFS_ATTR(fsg_opts_, stall); |
ef0aa4b9 AP |
3281 | |
3282 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
4a90cb20 | 3283 | static ssize_t fsg_opts_num_buffers_show(struct config_item *item, char *page) |
ef0aa4b9 | 3284 | { |
4a90cb20 | 3285 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3286 | int result; |
3287 | ||
3288 | mutex_lock(&opts->lock); | |
3289 | result = sprintf(page, "%d", opts->common->fsg_num_buffers); | |
3290 | mutex_unlock(&opts->lock); | |
3291 | ||
3292 | return result; | |
3293 | } | |
3294 | ||
4a90cb20 | 3295 | static ssize_t fsg_opts_num_buffers_store(struct config_item *item, |
ef0aa4b9 AP |
3296 | const char *page, size_t len) |
3297 | { | |
4a90cb20 | 3298 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3299 | int ret; |
3300 | u8 num; | |
3301 | ||
3302 | mutex_lock(&opts->lock); | |
3303 | if (opts->refcnt) { | |
3304 | ret = -EBUSY; | |
3305 | goto end; | |
3306 | } | |
3307 | ret = kstrtou8(page, 0, &num); | |
3308 | if (ret) | |
3309 | goto end; | |
3310 | ||
ef0aa4b9 AP |
3311 | fsg_common_set_num_buffers(opts->common, num); |
3312 | ret = len; | |
3313 | ||
3314 | end: | |
3315 | mutex_unlock(&opts->lock); | |
3316 | return ret; | |
3317 | } | |
3318 | ||
4a90cb20 | 3319 | CONFIGFS_ATTR(fsg_opts_, num_buffers); |
ef0aa4b9 AP |
3320 | #endif |
3321 | ||
3322 | static struct configfs_attribute *fsg_attrs[] = { | |
4a90cb20 | 3323 | &fsg_opts_attr_stall, |
ef0aa4b9 | 3324 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES |
4a90cb20 | 3325 | &fsg_opts_attr_num_buffers, |
ef0aa4b9 AP |
3326 | #endif |
3327 | NULL, | |
3328 | }; | |
3329 | ||
3330 | static struct configfs_group_operations fsg_group_ops = { | |
3331 | .make_group = fsg_lun_make, | |
3332 | .drop_item = fsg_lun_drop, | |
3333 | }; | |
3334 | ||
3335 | static struct config_item_type fsg_func_type = { | |
3336 | .ct_item_ops = &fsg_item_ops, | |
3337 | .ct_group_ops = &fsg_group_ops, | |
3338 | .ct_attrs = fsg_attrs, | |
3339 | .ct_owner = THIS_MODULE, | |
3340 | }; | |
3341 | ||
e5eaa0dc AP |
3342 | static void fsg_free_inst(struct usb_function_instance *fi) |
3343 | { | |
3344 | struct fsg_opts *opts; | |
3345 | ||
3346 | opts = fsg_opts_from_func_inst(fi); | |
3347 | fsg_common_put(opts->common); | |
3348 | kfree(opts); | |
3349 | } | |
3350 | ||
3351 | static struct usb_function_instance *fsg_alloc_inst(void) | |
3352 | { | |
3353 | struct fsg_opts *opts; | |
ef0aa4b9 | 3354 | struct fsg_lun_config config; |
e5eaa0dc AP |
3355 | int rc; |
3356 | ||
3357 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3358 | if (!opts) | |
3359 | return ERR_PTR(-ENOMEM); | |
ef0aa4b9 | 3360 | mutex_init(&opts->lock); |
e5eaa0dc | 3361 | opts->func_inst.free_func_inst = fsg_free_inst; |
7a93d040 | 3362 | opts->common = fsg_common_setup(opts->common); |
e5eaa0dc AP |
3363 | if (IS_ERR(opts->common)) { |
3364 | rc = PTR_ERR(opts->common); | |
3365 | goto release_opts; | |
3366 | } | |
e5eaa0dc AP |
3367 | |
3368 | rc = fsg_common_set_num_buffers(opts->common, | |
3369 | CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS); | |
3370 | if (rc) | |
dd02ea5a | 3371 | goto release_opts; |
e5eaa0dc AP |
3372 | |
3373 | pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); | |
3374 | ||
ef0aa4b9 AP |
3375 | memset(&config, 0, sizeof(config)); |
3376 | config.removable = true; | |
3377 | rc = fsg_common_create_lun(opts->common, &config, 0, "lun.0", | |
3378 | (const char **)&opts->func_inst.group.cg_item.ci_name); | |
903588a9 KO |
3379 | if (rc) |
3380 | goto release_buffers; | |
3381 | ||
ef0aa4b9 AP |
3382 | opts->lun0.lun = opts->common->luns[0]; |
3383 | opts->lun0.lun_id = 0; | |
ef0aa4b9 AP |
3384 | |
3385 | config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type); | |
3386 | ||
1ae1602d CH |
3387 | config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type); |
3388 | configfs_add_default_group(&opts->lun0.group, &opts->func_inst.group); | |
3389 | ||
e5eaa0dc AP |
3390 | return &opts->func_inst; |
3391 | ||
903588a9 KO |
3392 | release_buffers: |
3393 | fsg_common_free_buffers(opts->common); | |
e5eaa0dc AP |
3394 | release_opts: |
3395 | kfree(opts); | |
3396 | return ERR_PTR(rc); | |
3397 | } | |
3398 | ||
3399 | static void fsg_free(struct usb_function *f) | |
3400 | { | |
3401 | struct fsg_dev *fsg; | |
ef0aa4b9 | 3402 | struct fsg_opts *opts; |
e5eaa0dc AP |
3403 | |
3404 | fsg = container_of(f, struct fsg_dev, function); | |
ef0aa4b9 AP |
3405 | opts = container_of(f->fi, struct fsg_opts, func_inst); |
3406 | ||
3407 | mutex_lock(&opts->lock); | |
3408 | opts->refcnt--; | |
3409 | mutex_unlock(&opts->lock); | |
e5eaa0dc AP |
3410 | |
3411 | kfree(fsg); | |
3412 | } | |
3413 | ||
3414 | static struct usb_function *fsg_alloc(struct usb_function_instance *fi) | |
3415 | { | |
3416 | struct fsg_opts *opts = fsg_opts_from_func_inst(fi); | |
3417 | struct fsg_common *common = opts->common; | |
3418 | struct fsg_dev *fsg; | |
3419 | ||
3420 | fsg = kzalloc(sizeof(*fsg), GFP_KERNEL); | |
3421 | if (unlikely(!fsg)) | |
3422 | return ERR_PTR(-ENOMEM); | |
3423 | ||
ef0aa4b9 AP |
3424 | mutex_lock(&opts->lock); |
3425 | opts->refcnt++; | |
3426 | mutex_unlock(&opts->lock); | |
8515bac0 | 3427 | |
e5eaa0dc AP |
3428 | fsg->function.name = FSG_DRIVER_DESC; |
3429 | fsg->function.bind = fsg_bind; | |
3430 | fsg->function.unbind = fsg_unbind; | |
3431 | fsg->function.setup = fsg_setup; | |
3432 | fsg->function.set_alt = fsg_set_alt; | |
3433 | fsg->function.disable = fsg_disable; | |
3434 | fsg->function.free_func = fsg_free; | |
3435 | ||
3436 | fsg->common = common; | |
3437 | ||
3438 | return &fsg->function; | |
3439 | } | |
3440 | ||
3441 | DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc); | |
3442 | MODULE_LICENSE("GPL"); | |
3443 | MODULE_AUTHOR("Michal Nazarewicz"); | |
3444 | ||
481e4929 MN |
3445 | /************************* Module parameters *************************/ |
3446 | ||
6fdc5dd2 | 3447 | |
f3fed367 | 3448 | void fsg_config_from_params(struct fsg_config *cfg, |
6fdc5dd2 AP |
3449 | const struct fsg_module_parameters *params, |
3450 | unsigned int fsg_num_buffers) | |
481e4929 MN |
3451 | { |
3452 | struct fsg_lun_config *lun; | |
d26a6aa0 | 3453 | unsigned i; |
481e4929 MN |
3454 | |
3455 | /* Configure LUNs */ | |
d26a6aa0 MN |
3456 | cfg->nluns = |
3457 | min(params->luns ?: (params->file_count ?: 1u), | |
3458 | (unsigned)FSG_MAX_LUNS); | |
3459 | for (i = 0, lun = cfg->luns; i < cfg->nluns; ++i, ++lun) { | |
481e4929 MN |
3460 | lun->ro = !!params->ro[i]; |
3461 | lun->cdrom = !!params->cdrom[i]; | |
fa84c575 | 3462 | lun->removable = !!params->removable[i]; |
481e4929 MN |
3463 | lun->filename = |
3464 | params->file_count > i && params->file[i][0] | |
3465 | ? params->file[i] | |
136c489b | 3466 | : NULL; |
481e4929 MN |
3467 | } |
3468 | ||
d26a6aa0 | 3469 | /* Let MSF use defaults */ |
136c489b JH |
3470 | cfg->vendor_name = NULL; |
3471 | cfg->product_name = NULL; | |
481e4929 | 3472 | |
8876f5e7 MN |
3473 | cfg->ops = NULL; |
3474 | cfg->private_data = NULL; | |
c85efcb9 | 3475 | |
481e4929 MN |
3476 | /* Finalise */ |
3477 | cfg->can_stall = params->stall; | |
6fdc5dd2 | 3478 | cfg->fsg_num_buffers = fsg_num_buffers; |
481e4929 | 3479 | } |
7a93d040 | 3480 | EXPORT_SYMBOL_GPL(fsg_config_from_params); |