]>
Commit | Line | Data |
---|---|---|
d5e2b67a | 1 | /* |
d26a6aa0 | 2 | * f_mass_storage.c -- Mass Storage USB Composite Function |
d5e2b67a MN |
3 | * |
4 | * Copyright (C) 2003-2008 Alan Stern | |
d26a6aa0 | 5 | * Copyright (C) 2009 Samsung Electronics |
54b8360f | 6 | * Author: Michal Nazarewicz <mina86@mina86.com> |
d5e2b67a MN |
7 | * All rights reserved. |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions, and the following disclaimer, | |
14 | * without modification. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. The names of the above-listed copyright holders may not be used | |
19 | * to endorse or promote products derived from this software without | |
20 | * specific prior written permission. | |
21 | * | |
22 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
23 | * GNU General Public License ("GPL") as published by the Free Software | |
24 | * Foundation, either version 2 of that License or (at your option) any | |
25 | * later version. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
28 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
29 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
30 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
31 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
32 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
33 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
34 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
35 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
36 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
37 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
38 | */ | |
39 | ||
d5e2b67a | 40 | /* |
d26a6aa0 MN |
41 | * The Mass Storage Function acts as a USB Mass Storage device, |
42 | * appearing to the host as a disk drive or as a CD-ROM drive. In | |
43 | * addition to providing an example of a genuinely useful composite | |
44 | * function for a USB device, it also illustrates a technique of | |
45 | * double-buffering for increased throughput. | |
d5e2b67a | 46 | * |
a8287a4e MN |
47 | * For more information about MSF and in particular its module |
48 | * parameters and sysfs interface read the | |
49 | * <Documentation/usb/mass-storage.txt> file. | |
50 | */ | |
51 | ||
52 | /* | |
d26a6aa0 MN |
53 | * MSF is configured by specifying a fsg_config structure. It has the |
54 | * following fields: | |
55 | * | |
56 | * nluns Number of LUNs function have (anywhere from 1 | |
75ddead2 | 57 | * to FSG_MAX_LUNS). |
d26a6aa0 MN |
58 | * luns An array of LUN configuration values. This |
59 | * should be filled for each LUN that | |
60 | * function will include (ie. for "nluns" | |
61 | * LUNs). Each element of the array has | |
62 | * the following fields: | |
63 | * ->filename The path to the backing file for the LUN. | |
64 | * Required if LUN is not marked as | |
65 | * removable. | |
66 | * ->ro Flag specifying access to the LUN shall be | |
67 | * read-only. This is implied if CD-ROM | |
68 | * emulation is enabled as well as when | |
69 | * it was impossible to open "filename" | |
70 | * in R/W mode. | |
71 | * ->removable Flag specifying that LUN shall be indicated as | |
72 | * being removable. | |
73 | * ->cdrom Flag specifying that LUN shall be reported as | |
74 | * being a CD-ROM. | |
9cfe745e MN |
75 | * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12) |
76 | * commands for this LUN shall be ignored. | |
d26a6aa0 | 77 | * |
d26a6aa0 MN |
78 | * vendor_name |
79 | * product_name | |
80 | * release Information used as a reply to INQUIRY | |
81 | * request. To use default set to NULL, | |
82 | * NULL, 0xffff respectively. The first | |
83 | * field should be 8 and the second 16 | |
84 | * characters or less. | |
85 | * | |
86 | * can_stall Set to permit function to halt bulk endpoints. | |
87 | * Disabled on some USB devices known not | |
88 | * to work correctly. You should set it | |
89 | * to true. | |
90 | * | |
91 | * If "removable" is not set for a LUN then a backing file must be | |
92 | * specified. If it is set, then NULL filename means the LUN's medium | |
93 | * is not loaded (an empty string as "filename" in the fsg_config | |
94 | * structure causes error). The CD-ROM emulation includes a single | |
95 | * data track and no audio tracks; hence there need be only one | |
3f565a36 | 96 | * backing file per LUN. |
d26a6aa0 | 97 | * |
d26a6aa0 MN |
98 | * This function is heavily based on "File-backed Storage Gadget" by |
99 | * Alan Stern which in turn is heavily based on "Gadget Zero" by David | |
100 | * Brownell. The driver's SCSI command interface was based on the | |
101 | * "Information technology - Small Computer System Interface - 2" | |
102 | * document from X3T9.2 Project 375D, Revision 10L, 7-SEP-93, | |
103 | * available at <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. | |
104 | * The single exception is opcode 0x23 (READ FORMAT CAPACITIES), which | |
105 | * was based on the "Universal Serial Bus Mass Storage Class UFI | |
106 | * Command Specification" document, Revision 1.0, December 14, 1998, | |
107 | * available at | |
d5e2b67a MN |
108 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>. |
109 | */ | |
110 | ||
d5e2b67a MN |
111 | /* |
112 | * Driver Design | |
113 | * | |
d26a6aa0 | 114 | * The MSF is fairly straightforward. There is a main kernel |
d5e2b67a MN |
115 | * thread that handles most of the work. Interrupt routines field |
116 | * callbacks from the controller driver: bulk- and interrupt-request | |
117 | * completion notifications, endpoint-0 events, and disconnect events. | |
118 | * Completion events are passed to the main thread by wakeup calls. Many | |
119 | * ep0 requests are handled at interrupt time, but SetInterface, | |
120 | * SetConfiguration, and device reset requests are forwarded to the | |
121 | * thread in the form of "exceptions" using SIGUSR1 signals (since they | |
122 | * should interrupt any ongoing file I/O operations). | |
123 | * | |
124 | * The thread's main routine implements the standard command/data/status | |
125 | * parts of a SCSI interaction. It and its subroutines are full of tests | |
126 | * for pending signals/exceptions -- all this polling is necessary since | |
127 | * the kernel has no setjmp/longjmp equivalents. (Maybe this is an | |
128 | * indication that the driver really wants to be running in userspace.) | |
129 | * An important point is that so long as the thread is alive it keeps an | |
130 | * open reference to the backing file. This will prevent unmounting | |
131 | * the backing file's underlying filesystem and could cause problems | |
132 | * during system shutdown, for example. To prevent such problems, the | |
133 | * thread catches INT, TERM, and KILL signals and converts them into | |
134 | * an EXIT exception. | |
135 | * | |
136 | * In normal operation the main thread is started during the gadget's | |
d26a6aa0 MN |
137 | * fsg_bind() callback and stopped during fsg_unbind(). But it can |
138 | * also exit when it receives a signal, and there's no point leaving | |
a8287a4e | 139 | * the gadget running when the thread is dead. As of this moment, MSF |
d26a6aa0 MN |
140 | * provides no way to deregister the gadget when thread dies -- maybe |
141 | * a callback functions is needed. | |
d5e2b67a MN |
142 | * |
143 | * To provide maximum throughput, the driver uses a circular pipeline of | |
144 | * buffer heads (struct fsg_buffhd). In principle the pipeline can be | |
145 | * arbitrarily long; in practice the benefits don't justify having more | |
146 | * than 2 stages (i.e., double buffering). But it helps to think of the | |
147 | * pipeline as being a long one. Each buffer head contains a bulk-in and | |
148 | * a bulk-out request pointer (since the buffer can be used for both | |
149 | * output and input -- directions always are given from the host's | |
150 | * point of view) as well as a pointer to the buffer and various state | |
151 | * variables. | |
152 | * | |
153 | * Use of the pipeline follows a simple protocol. There is a variable | |
154 | * (fsg->next_buffhd_to_fill) that points to the next buffer head to use. | |
155 | * At any time that buffer head may still be in use from an earlier | |
156 | * request, so each buffer head has a state variable indicating whether | |
157 | * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the | |
158 | * buffer head to be EMPTY, filling the buffer either by file I/O or by | |
159 | * USB I/O (during which the buffer head is BUSY), and marking the buffer | |
160 | * head FULL when the I/O is complete. Then the buffer will be emptied | |
161 | * (again possibly by USB I/O, during which it is marked BUSY) and | |
162 | * finally marked EMPTY again (possibly by a completion routine). | |
163 | * | |
164 | * A module parameter tells the driver to avoid stalling the bulk | |
165 | * endpoints wherever the transport specification allows. This is | |
166 | * necessary for some UDCs like the SuperH, which cannot reliably clear a | |
167 | * halt on a bulk endpoint. However, under certain circumstances the | |
168 | * Bulk-only specification requires a stall. In such cases the driver | |
169 | * will halt the endpoint and set a flag indicating that it should clear | |
170 | * the halt in software during the next device reset. Hopefully this | |
171 | * will permit everything to work correctly. Furthermore, although the | |
172 | * specification allows the bulk-out endpoint to halt when the host sends | |
173 | * too much data, implementing this would cause an unavoidable race. | |
174 | * The driver will always use the "no-stall" approach for OUT transfers. | |
175 | * | |
176 | * One subtle point concerns sending status-stage responses for ep0 | |
177 | * requests. Some of these requests, such as device reset, can involve | |
178 | * interrupting an ongoing file I/O operation, which might take an | |
179 | * arbitrarily long time. During that delay the host might give up on | |
180 | * the original ep0 request and issue a new one. When that happens the | |
181 | * driver should not notify the host about completion of the original | |
182 | * request, as the host will no longer be waiting for it. So the driver | |
183 | * assigns to each ep0 request a unique tag, and it keeps track of the | |
184 | * tag value of the request associated with a long-running exception | |
185 | * (device-reset, interface-change, or configuration-change). When the | |
186 | * exception handler is finished, the status-stage response is submitted | |
187 | * only if the current ep0 request tag is equal to the exception request | |
188 | * tag. Thus only the most recently received ep0 request will get a | |
189 | * status-stage response. | |
190 | * | |
191 | * Warning: This driver source file is too long. It ought to be split up | |
192 | * into a header file plus about 3 separate .c files, to handle the details | |
193 | * of the Gadget, USB Mass Storage, and SCSI protocols. | |
194 | */ | |
195 | ||
196 | ||
197 | /* #define VERBOSE_DEBUG */ | |
198 | /* #define DUMP_MSGS */ | |
199 | ||
d5e2b67a MN |
200 | #include <linux/blkdev.h> |
201 | #include <linux/completion.h> | |
202 | #include <linux/dcache.h> | |
203 | #include <linux/delay.h> | |
204 | #include <linux/device.h> | |
205 | #include <linux/fcntl.h> | |
206 | #include <linux/file.h> | |
207 | #include <linux/fs.h> | |
208 | #include <linux/kref.h> | |
209 | #include <linux/kthread.h> | |
3f07c014 | 210 | #include <linux/sched/signal.h> |
d5e2b67a MN |
211 | #include <linux/limits.h> |
212 | #include <linux/rwsem.h> | |
213 | #include <linux/slab.h> | |
214 | #include <linux/spinlock.h> | |
215 | #include <linux/string.h> | |
216 | #include <linux/freezer.h> | |
e5eaa0dc | 217 | #include <linux/module.h> |
4a1e9211 | 218 | #include <linux/uaccess.h> |
d5e2b67a MN |
219 | |
220 | #include <linux/usb/ch9.h> | |
221 | #include <linux/usb/gadget.h> | |
a283c03a | 222 | #include <linux/usb/composite.h> |
d5e2b67a | 223 | |
ef0aa4b9 | 224 | #include "configfs.h" |
d5e2b67a MN |
225 | |
226 | ||
e8b6f8c5 | 227 | /*------------------------------------------------------------------------*/ |
d5e2b67a | 228 | |
d23b0f08 | 229 | #define FSG_DRIVER_DESC "Mass Storage Function" |
d26a6aa0 | 230 | #define FSG_DRIVER_VERSION "2009/09/11" |
d5e2b67a | 231 | |
d5e2b67a MN |
232 | static const char fsg_string_interface[] = "Mass Storage"; |
233 | ||
6fdc5dd2 | 234 | #include "storage_common.h" |
f3fed367 | 235 | #include "f_mass_storage.h" |
d5e2b67a | 236 | |
6fdc5dd2 AP |
237 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ |
238 | static struct usb_string fsg_strings[] = { | |
239 | {FSG_STRING_INTERFACE, fsg_string_interface}, | |
240 | {} | |
241 | }; | |
242 | ||
243 | static struct usb_gadget_strings fsg_stringtab = { | |
244 | .language = 0x0409, /* en-us */ | |
245 | .strings = fsg_strings, | |
246 | }; | |
d5e2b67a | 247 | |
4610f19b AP |
248 | static struct usb_gadget_strings *fsg_strings_array[] = { |
249 | &fsg_stringtab, | |
250 | NULL, | |
251 | }; | |
252 | ||
d5e2b67a MN |
253 | /*-------------------------------------------------------------------------*/ |
254 | ||
8ea864cf | 255 | struct fsg_dev; |
8876f5e7 MN |
256 | struct fsg_common; |
257 | ||
a41ae418 MN |
258 | /* Data shared by all the FSG instances. */ |
259 | struct fsg_common { | |
9c610213 | 260 | struct usb_gadget *gadget; |
95ed3236 | 261 | struct usb_composite_dev *cdev; |
b894f60a | 262 | struct fsg_dev *fsg, *new_fsg; |
225785ae | 263 | wait_queue_head_t io_wait; |
b894f60a | 264 | wait_queue_head_t fsg_wait; |
9c610213 | 265 | |
a41ae418 MN |
266 | /* filesem protects: backing files in use */ |
267 | struct rw_semaphore filesem; | |
268 | ||
225785ae | 269 | /* lock protects: state and thread_task */ |
8ea864cf MN |
270 | spinlock_t lock; |
271 | ||
272 | struct usb_ep *ep0; /* Copy of gadget->ep0 */ | |
273 | struct usb_request *ep0req; /* Copy of cdev->req */ | |
274 | unsigned int ep0_req_tag; | |
8ea864cf | 275 | |
a41ae418 MN |
276 | struct fsg_buffhd *next_buffhd_to_fill; |
277 | struct fsg_buffhd *next_buffhd_to_drain; | |
6532c7fd | 278 | struct fsg_buffhd *buffhds; |
6fdc5dd2 | 279 | unsigned int fsg_num_buffers; |
a41ae418 MN |
280 | |
281 | int cmnd_size; | |
282 | u8 cmnd[MAX_COMMAND_SIZE]; | |
283 | ||
a41ae418 | 284 | unsigned int lun; |
dd02ea5a | 285 | struct fsg_lun *luns[FSG_MAX_LUNS]; |
a41ae418 | 286 | struct fsg_lun *curlun; |
9c610213 | 287 | |
8ea864cf MN |
288 | unsigned int bulk_out_maxpacket; |
289 | enum fsg_state state; /* For exception handling */ | |
290 | unsigned int exception_req_tag; | |
291 | ||
8ea864cf MN |
292 | enum data_direction data_dir; |
293 | u32 data_size; | |
294 | u32 data_size_from_cmnd; | |
295 | u32 tag; | |
296 | u32 residue; | |
297 | u32 usb_amount_left; | |
298 | ||
481e4929 | 299 | unsigned int can_stall:1; |
9c610213 | 300 | unsigned int free_storage_on_release:1; |
8ea864cf MN |
301 | unsigned int phase_error:1; |
302 | unsigned int short_packet_received:1; | |
303 | unsigned int bad_lun_okay:1; | |
304 | unsigned int running:1; | |
bd528d4e | 305 | unsigned int sysfs:1; |
9c610213 | 306 | |
8ea864cf MN |
307 | struct completion thread_notifier; |
308 | struct task_struct *thread_task; | |
e8b6f8c5 | 309 | |
8876f5e7 MN |
310 | /* Callback functions. */ |
311 | const struct fsg_operations *ops; | |
c85efcb9 MN |
312 | /* Gadget's private data. */ |
313 | void *private_data; | |
314 | ||
6ac47090 | 315 | char inquiry_string[INQUIRY_STRING_LEN]; |
481e4929 | 316 | |
9c610213 | 317 | struct kref ref; |
a41ae418 MN |
318 | }; |
319 | ||
d5e2b67a | 320 | struct fsg_dev { |
d23b0f08 | 321 | struct usb_function function; |
d23b0f08 | 322 | struct usb_gadget *gadget; /* Copy of cdev->gadget */ |
a41ae418 MN |
323 | struct fsg_common *common; |
324 | ||
d23b0f08 MN |
325 | u16 interface_number; |
326 | ||
d26a6aa0 MN |
327 | unsigned int bulk_in_enabled:1; |
328 | unsigned int bulk_out_enabled:1; | |
d5e2b67a MN |
329 | |
330 | unsigned long atomic_bitflags; | |
8ea864cf | 331 | #define IGNORE_BULK_OUT 0 |
d5e2b67a MN |
332 | |
333 | struct usb_ep *bulk_in; | |
334 | struct usb_ep *bulk_out; | |
8ea864cf | 335 | }; |
d5e2b67a | 336 | |
8ea864cf MN |
337 | static inline int __fsg_is_set(struct fsg_common *common, |
338 | const char *func, unsigned line) | |
339 | { | |
340 | if (common->fsg) | |
341 | return 1; | |
342 | ERROR(common, "common->fsg is NULL in %s at %u\n", func, line); | |
8876f5e7 | 343 | WARN_ON(1); |
8ea864cf MN |
344 | return 0; |
345 | } | |
346 | ||
347 | #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__)) | |
d5e2b67a | 348 | |
d23b0f08 MN |
349 | static inline struct fsg_dev *fsg_from_func(struct usb_function *f) |
350 | { | |
351 | return container_of(f, struct fsg_dev, function); | |
352 | } | |
353 | ||
d5e2b67a MN |
354 | typedef void (*fsg_routine_t)(struct fsg_dev *); |
355 | ||
8ea864cf | 356 | static int exception_in_progress(struct fsg_common *common) |
d5e2b67a | 357 | { |
78db441d | 358 | return common->state > FSG_STATE_NORMAL; |
d5e2b67a MN |
359 | } |
360 | ||
98346f7d GKH |
361 | /* Make bulk-out requests be divisible by the maxpacket size */ |
362 | static void set_bulk_out_req_length(struct fsg_common *common, | |
363 | struct fsg_buffhd *bh, unsigned int length) | |
364 | { | |
365 | unsigned int rem; | |
366 | ||
367 | bh->bulk_out_intended_length = length; | |
368 | rem = length % common->bulk_out_maxpacket; | |
369 | if (rem > 0) | |
370 | length += common->bulk_out_maxpacket - rem; | |
371 | bh->outreq->length = length; | |
372 | } | |
373 | ||
374 | ||
d5e2b67a MN |
375 | /*-------------------------------------------------------------------------*/ |
376 | ||
377 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) | |
378 | { | |
379 | const char *name; | |
380 | ||
381 | if (ep == fsg->bulk_in) | |
382 | name = "bulk-in"; | |
383 | else if (ep == fsg->bulk_out) | |
384 | name = "bulk-out"; | |
385 | else | |
386 | name = ep->name; | |
387 | DBG(fsg, "%s set halt\n", name); | |
388 | return usb_ep_set_halt(ep); | |
389 | } | |
390 | ||
391 | ||
d5e2b67a MN |
392 | /*-------------------------------------------------------------------------*/ |
393 | ||
394 | /* These routines may be called in process context or in_irq */ | |
395 | ||
8ea864cf | 396 | static void raise_exception(struct fsg_common *common, enum fsg_state new_state) |
d5e2b67a MN |
397 | { |
398 | unsigned long flags; | |
399 | ||
b73af61e MN |
400 | /* |
401 | * Do nothing if a higher-priority exception is already in progress. | |
d5e2b67a | 402 | * If a lower-or-equal priority exception is in progress, preempt it |
b73af61e MN |
403 | * and notify the main thread by sending it a signal. |
404 | */ | |
8ea864cf MN |
405 | spin_lock_irqsave(&common->lock, flags); |
406 | if (common->state <= new_state) { | |
407 | common->exception_req_tag = common->ep0_req_tag; | |
408 | common->state = new_state; | |
409 | if (common->thread_task) | |
d5e2b67a | 410 | send_sig_info(SIGUSR1, SEND_SIG_FORCED, |
8ea864cf | 411 | common->thread_task); |
d5e2b67a | 412 | } |
8ea864cf | 413 | spin_unlock_irqrestore(&common->lock, flags); |
d5e2b67a MN |
414 | } |
415 | ||
416 | ||
417 | /*-------------------------------------------------------------------------*/ | |
418 | ||
8ea864cf | 419 | static int ep0_queue(struct fsg_common *common) |
d5e2b67a MN |
420 | { |
421 | int rc; | |
422 | ||
8ea864cf MN |
423 | rc = usb_ep_queue(common->ep0, common->ep0req, GFP_ATOMIC); |
424 | common->ep0->driver_data = common; | |
d5e2b67a | 425 | if (rc != 0 && rc != -ESHUTDOWN) { |
d5e2b67a | 426 | /* We can't do much more than wait for a reset */ |
8ea864cf MN |
427 | WARNING(common, "error in submission: %s --> %d\n", |
428 | common->ep0->name, rc); | |
d5e2b67a MN |
429 | } |
430 | return rc; | |
431 | } | |
432 | ||
b73af61e | 433 | |
d5e2b67a MN |
434 | /*-------------------------------------------------------------------------*/ |
435 | ||
b73af61e | 436 | /* Completion handlers. These always run in_irq. */ |
d5e2b67a MN |
437 | |
438 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) | |
439 | { | |
8ea864cf | 440 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
441 | struct fsg_buffhd *bh = req->context; |
442 | ||
443 | if (req->status || req->actual != req->length) | |
8ea864cf | 444 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
b73af61e | 445 | req->status, req->actual, req->length); |
d26a6aa0 | 446 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
447 | usb_ep_fifo_flush(ep); |
448 | ||
225785ae AS |
449 | /* Synchronize with the smp_load_acquire() in sleep_thread() */ |
450 | smp_store_release(&bh->state, BUF_STATE_EMPTY); | |
451 | wake_up(&common->io_wait); | |
d5e2b67a MN |
452 | } |
453 | ||
454 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) | |
455 | { | |
8ea864cf | 456 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
457 | struct fsg_buffhd *bh = req->context; |
458 | ||
8ea864cf | 459 | dump_msg(common, "bulk-out", req->buf, req->actual); |
98346f7d | 460 | if (req->status || req->actual != bh->bulk_out_intended_length) |
8ea864cf | 461 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
98346f7d | 462 | req->status, req->actual, bh->bulk_out_intended_length); |
d26a6aa0 | 463 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
464 | usb_ep_fifo_flush(ep); |
465 | ||
225785ae AS |
466 | /* Synchronize with the smp_load_acquire() in sleep_thread() */ |
467 | smp_store_release(&bh->state, BUF_STATE_FULL); | |
468 | wake_up(&common->io_wait); | |
d5e2b67a MN |
469 | } |
470 | ||
dd02ea5a KO |
471 | static int _fsg_common_get_max_lun(struct fsg_common *common) |
472 | { | |
473 | int i = ARRAY_SIZE(common->luns) - 1; | |
474 | ||
475 | while (i >= 0 && !common->luns[i]) | |
476 | --i; | |
477 | ||
478 | return i; | |
479 | } | |
480 | ||
d23b0f08 | 481 | static int fsg_setup(struct usb_function *f, |
b73af61e | 482 | const struct usb_ctrlrequest *ctrl) |
d5e2b67a | 483 | { |
d23b0f08 | 484 | struct fsg_dev *fsg = fsg_from_func(f); |
8ea864cf | 485 | struct usb_request *req = fsg->common->ep0req; |
d5e2b67a | 486 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
93bcf12e | 487 | u16 w_value = le16_to_cpu(ctrl->wValue); |
d5e2b67a MN |
488 | u16 w_length = le16_to_cpu(ctrl->wLength); |
489 | ||
b894f60a | 490 | if (!fsg_is_set(fsg->common)) |
93bcf12e | 491 | return -EOPNOTSUPP; |
d5e2b67a | 492 | |
73ee4da9 RQ |
493 | ++fsg->common->ep0_req_tag; /* Record arrival of a new request */ |
494 | req->context = NULL; | |
495 | req->length = 0; | |
496 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); | |
497 | ||
93bcf12e | 498 | switch (ctrl->bRequest) { |
d5e2b67a | 499 | |
775dafdc | 500 | case US_BULK_RESET_REQUEST: |
93bcf12e MN |
501 | if (ctrl->bRequestType != |
502 | (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 503 | break; |
ce7b6121 PZ |
504 | if (w_index != fsg->interface_number || w_value != 0 || |
505 | w_length != 0) | |
93bcf12e | 506 | return -EDOM; |
d5e2b67a | 507 | |
b73af61e MN |
508 | /* |
509 | * Raise an exception to stop the current operation | |
510 | * and reinitialize our state. | |
511 | */ | |
93bcf12e | 512 | DBG(fsg, "bulk reset request\n"); |
78db441d | 513 | raise_exception(fsg->common, FSG_STATE_PROTOCOL_RESET); |
655403c2 | 514 | return USB_GADGET_DELAYED_STATUS; |
d5e2b67a | 515 | |
775dafdc | 516 | case US_BULK_GET_MAX_LUN: |
93bcf12e MN |
517 | if (ctrl->bRequestType != |
518 | (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 519 | break; |
db332bc9 PZ |
520 | if (w_index != fsg->interface_number || w_value != 0 || |
521 | w_length != 1) | |
93bcf12e MN |
522 | return -EDOM; |
523 | VDBG(fsg, "get max LUN\n"); | |
dd02ea5a | 524 | *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); |
b00ce11f MN |
525 | |
526 | /* Respond with data/status */ | |
d7e18a9f | 527 | req->length = min((u16)1, w_length); |
b00ce11f | 528 | return ep0_queue(fsg->common); |
93bcf12e MN |
529 | } |
530 | ||
531 | VDBG(fsg, | |
b73af61e | 532 | "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n", |
93bcf12e MN |
533 | ctrl->bRequestType, ctrl->bRequest, |
534 | le16_to_cpu(ctrl->wValue), w_index, w_length); | |
535 | return -EOPNOTSUPP; | |
d5e2b67a MN |
536 | } |
537 | ||
538 | ||
d5e2b67a MN |
539 | /*-------------------------------------------------------------------------*/ |
540 | ||
541 | /* All the following routines run in process context */ | |
542 | ||
d5e2b67a | 543 | /* Use this for bulk or interrupt transfers, not ep0 */ |
225785ae AS |
544 | static int start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, |
545 | struct usb_request *req) | |
d5e2b67a MN |
546 | { |
547 | int rc; | |
548 | ||
549 | if (ep == fsg->bulk_in) | |
550 | dump_msg(fsg, "bulk-in", req->buf, req->length); | |
d5e2b67a | 551 | |
d5e2b67a | 552 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
225785ae | 553 | if (rc) { |
d5e2b67a | 554 | |
225785ae AS |
555 | /* We can't do much more than wait for a reset */ |
556 | req->status = rc; | |
4953ef65 | 557 | |
225785ae AS |
558 | /* |
559 | * Note: currently the net2280 driver fails zero-length | |
560 | * submissions if DMA is enabled. | |
561 | */ | |
562 | if (rc != -ESHUTDOWN && | |
563 | !(rc == -EOPNOTSUPP && req->length == 0)) | |
564 | WARNING(fsg, "error in submission: %s --> %d\n", | |
565 | ep->name, rc); | |
566 | } | |
567 | return rc; | |
d5e2b67a MN |
568 | } |
569 | ||
fe52f792 MN |
570 | static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
571 | { | |
572 | if (!fsg_is_set(common)) | |
573 | return false; | |
225785ae AS |
574 | bh->state = BUF_STATE_SENDING; |
575 | if (start_transfer(common->fsg, common->fsg->bulk_in, bh->inreq)) | |
576 | bh->state = BUF_STATE_EMPTY; | |
fe52f792 MN |
577 | return true; |
578 | } | |
8ea864cf | 579 | |
fe52f792 MN |
580 | static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
581 | { | |
582 | if (!fsg_is_set(common)) | |
583 | return false; | |
225785ae AS |
584 | bh->state = BUF_STATE_RECEIVING; |
585 | if (start_transfer(common->fsg, common->fsg->bulk_out, bh->outreq)) | |
586 | bh->state = BUF_STATE_FULL; | |
fe52f792 MN |
587 | return true; |
588 | } | |
d5e2b67a | 589 | |
225785ae AS |
590 | static int sleep_thread(struct fsg_common *common, bool can_freeze, |
591 | struct fsg_buffhd *bh) | |
d5e2b67a | 592 | { |
225785ae | 593 | int rc; |
d5e2b67a | 594 | |
225785ae AS |
595 | /* Wait until a signal arrives or bh is no longer busy */ |
596 | if (can_freeze) | |
597 | /* | |
598 | * synchronize with the smp_store_release(&bh->state) in | |
599 | * bulk_in_complete() or bulk_out_complete() | |
600 | */ | |
601 | rc = wait_event_freezable(common->io_wait, | |
602 | bh && smp_load_acquire(&bh->state) >= | |
603 | BUF_STATE_EMPTY); | |
604 | else | |
605 | rc = wait_event_interruptible(common->io_wait, | |
606 | bh && smp_load_acquire(&bh->state) >= | |
607 | BUF_STATE_EMPTY); | |
608 | return rc ? -EINTR : 0; | |
d5e2b67a MN |
609 | } |
610 | ||
611 | ||
612 | /*-------------------------------------------------------------------------*/ | |
613 | ||
8ea864cf | 614 | static int do_read(struct fsg_common *common) |
d5e2b67a | 615 | { |
8ea864cf | 616 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
617 | u32 lba; |
618 | struct fsg_buffhd *bh; | |
619 | int rc; | |
620 | u32 amount_left; | |
621 | loff_t file_offset, file_offset_tmp; | |
622 | unsigned int amount; | |
d5e2b67a MN |
623 | ssize_t nread; |
624 | ||
b73af61e MN |
625 | /* |
626 | * Get the starting Logical Block Address and check that it's | |
627 | * not too big. | |
628 | */ | |
0a6a717c | 629 | if (common->cmnd[0] == READ_6) |
8ea864cf | 630 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 631 | else { |
8ea864cf | 632 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 633 | |
b73af61e MN |
634 | /* |
635 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a | 636 | * cache) and FUA (Force Unit Access = don't read from the |
b73af61e MN |
637 | * cache), but we don't implement them. |
638 | */ | |
8ea864cf | 639 | if ((common->cmnd[1] & ~0x18) != 0) { |
d5e2b67a MN |
640 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
641 | return -EINVAL; | |
642 | } | |
643 | } | |
644 | if (lba >= curlun->num_sectors) { | |
645 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
646 | return -EINVAL; | |
647 | } | |
3f565a36 | 648 | file_offset = ((loff_t) lba) << curlun->blkbits; |
d5e2b67a MN |
649 | |
650 | /* Carry out the file reads */ | |
8ea864cf | 651 | amount_left = common->data_size_from_cmnd; |
d5e2b67a | 652 | if (unlikely(amount_left == 0)) |
d26a6aa0 | 653 | return -EIO; /* No default reply */ |
d5e2b67a MN |
654 | |
655 | for (;;) { | |
b73af61e MN |
656 | /* |
657 | * Figure out how much we need to read: | |
d5e2b67a MN |
658 | * Try to read the remaining amount. |
659 | * But don't read more than the buffer size. | |
660 | * And don't try to read past the end of the file. | |
b73af61e | 661 | */ |
93bcf12e | 662 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
663 | amount = min((loff_t)amount, |
664 | curlun->file_length - file_offset); | |
d5e2b67a MN |
665 | |
666 | /* Wait for the next buffer to become available */ | |
8ea864cf | 667 | bh = common->next_buffhd_to_fill; |
225785ae AS |
668 | rc = sleep_thread(common, false, bh); |
669 | if (rc) | |
670 | return rc; | |
d5e2b67a | 671 | |
b73af61e MN |
672 | /* |
673 | * If we were asked to read past the end of file, | |
674 | * end with an empty buffer. | |
675 | */ | |
d5e2b67a MN |
676 | if (amount == 0) { |
677 | curlun->sense_data = | |
678 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
679 | curlun->sense_data_info = |
680 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
681 | curlun->info_valid = 1; |
682 | bh->inreq->length = 0; | |
683 | bh->state = BUF_STATE_FULL; | |
684 | break; | |
685 | } | |
686 | ||
687 | /* Perform the read */ | |
688 | file_offset_tmp = file_offset; | |
689 | nread = vfs_read(curlun->filp, | |
b73af61e MN |
690 | (char __user *)bh->buf, |
691 | amount, &file_offset_tmp); | |
d5e2b67a | 692 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
b73af61e | 693 | (unsigned long long)file_offset, (int)nread); |
d5e2b67a MN |
694 | if (signal_pending(current)) |
695 | return -EINTR; | |
696 | ||
697 | if (nread < 0) { | |
b73af61e | 698 | LDBG(curlun, "error in file read: %d\n", (int)nread); |
d5e2b67a MN |
699 | nread = 0; |
700 | } else if (nread < amount) { | |
701 | LDBG(curlun, "partial file read: %d/%u\n", | |
b73af61e | 702 | (int)nread, amount); |
3f565a36 | 703 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
704 | } |
705 | file_offset += nread; | |
706 | amount_left -= nread; | |
8ea864cf | 707 | common->residue -= nread; |
04eee25b AS |
708 | |
709 | /* | |
710 | * Except at the end of the transfer, nread will be | |
711 | * equal to the buffer size, which is divisible by the | |
712 | * bulk-in maxpacket size. | |
713 | */ | |
d5e2b67a MN |
714 | bh->inreq->length = nread; |
715 | bh->state = BUF_STATE_FULL; | |
716 | ||
717 | /* If an error occurred, report it and its position */ | |
718 | if (nread < amount) { | |
719 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
720 | curlun->sense_data_info = |
721 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
722 | curlun->info_valid = 1; |
723 | break; | |
724 | } | |
725 | ||
726 | if (amount_left == 0) | |
d26a6aa0 | 727 | break; /* No more left to read */ |
d5e2b67a MN |
728 | |
729 | /* Send this buffer and go read some more */ | |
730 | bh->inreq->zero = 0; | |
fe52f792 MN |
731 | if (!start_in_transfer(common, bh)) |
732 | /* Don't know what to do if common->fsg is NULL */ | |
8ea864cf MN |
733 | return -EIO; |
734 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
735 | } |
736 | ||
d26a6aa0 | 737 | return -EIO; /* No default reply */ |
d5e2b67a MN |
738 | } |
739 | ||
740 | ||
741 | /*-------------------------------------------------------------------------*/ | |
742 | ||
8ea864cf | 743 | static int do_write(struct fsg_common *common) |
d5e2b67a | 744 | { |
8ea864cf | 745 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
746 | u32 lba; |
747 | struct fsg_buffhd *bh; | |
748 | int get_some_more; | |
749 | u32 amount_left_to_req, amount_left_to_write; | |
750 | loff_t usb_offset, file_offset, file_offset_tmp; | |
751 | unsigned int amount; | |
d5e2b67a MN |
752 | ssize_t nwritten; |
753 | int rc; | |
754 | ||
755 | if (curlun->ro) { | |
756 | curlun->sense_data = SS_WRITE_PROTECTED; | |
757 | return -EINVAL; | |
758 | } | |
759 | spin_lock(&curlun->filp->f_lock); | |
d26a6aa0 | 760 | curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */ |
d5e2b67a MN |
761 | spin_unlock(&curlun->filp->f_lock); |
762 | ||
b73af61e MN |
763 | /* |
764 | * Get the starting Logical Block Address and check that it's | |
765 | * not too big | |
766 | */ | |
0a6a717c | 767 | if (common->cmnd[0] == WRITE_6) |
8ea864cf | 768 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 769 | else { |
8ea864cf | 770 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 771 | |
b73af61e MN |
772 | /* |
773 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a MN |
774 | * cache) and FUA (Force Unit Access = write directly to the |
775 | * medium). We don't implement DPO; we implement FUA by | |
b73af61e MN |
776 | * performing synchronous output. |
777 | */ | |
8ea864cf | 778 | if (common->cmnd[1] & ~0x18) { |
d5e2b67a MN |
779 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
780 | return -EINVAL; | |
781 | } | |
9cfe745e | 782 | if (!curlun->nofua && (common->cmnd[1] & 0x08)) { /* FUA */ |
d5e2b67a MN |
783 | spin_lock(&curlun->filp->f_lock); |
784 | curlun->filp->f_flags |= O_SYNC; | |
785 | spin_unlock(&curlun->filp->f_lock); | |
786 | } | |
787 | } | |
788 | if (lba >= curlun->num_sectors) { | |
789 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
790 | return -EINVAL; | |
791 | } | |
792 | ||
793 | /* Carry out the file writes */ | |
794 | get_some_more = 1; | |
3f565a36 | 795 | file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits; |
8ea864cf MN |
796 | amount_left_to_req = common->data_size_from_cmnd; |
797 | amount_left_to_write = common->data_size_from_cmnd; | |
d5e2b67a MN |
798 | |
799 | while (amount_left_to_write > 0) { | |
800 | ||
801 | /* Queue a request for more data from the host */ | |
8ea864cf | 802 | bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
803 | if (bh->state == BUF_STATE_EMPTY && get_some_more) { |
804 | ||
b73af61e MN |
805 | /* |
806 | * Figure out how much we want to get: | |
04eee25b AS |
807 | * Try to get the remaining amount, |
808 | * but not more than the buffer size. | |
b73af61e | 809 | */ |
93bcf12e | 810 | amount = min(amount_left_to_req, FSG_BUFLEN); |
04eee25b AS |
811 | |
812 | /* Beyond the end of the backing file? */ | |
813 | if (usb_offset >= curlun->file_length) { | |
d5e2b67a MN |
814 | get_some_more = 0; |
815 | curlun->sense_data = | |
816 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
817 | curlun->sense_data_info = |
818 | usb_offset >> curlun->blkbits; | |
d5e2b67a MN |
819 | curlun->info_valid = 1; |
820 | continue; | |
821 | } | |
d5e2b67a MN |
822 | |
823 | /* Get the next buffer */ | |
824 | usb_offset += amount; | |
8ea864cf | 825 | common->usb_amount_left -= amount; |
d5e2b67a MN |
826 | amount_left_to_req -= amount; |
827 | if (amount_left_to_req == 0) | |
828 | get_some_more = 0; | |
829 | ||
b73af61e | 830 | /* |
04eee25b AS |
831 | * Except at the end of the transfer, amount will be |
832 | * equal to the buffer size, which is divisible by | |
833 | * the bulk-out maxpacket size. | |
b73af61e | 834 | */ |
fe696765 | 835 | set_bulk_out_req_length(common, bh, amount); |
fe52f792 | 836 | if (!start_out_transfer(common, bh)) |
b73af61e | 837 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf MN |
838 | return -EIO; |
839 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
840 | continue; |
841 | } | |
842 | ||
843 | /* Write the received data to the backing file */ | |
8ea864cf | 844 | bh = common->next_buffhd_to_drain; |
d5e2b67a | 845 | if (bh->state == BUF_STATE_EMPTY && !get_some_more) |
d26a6aa0 | 846 | break; /* We stopped early */ |
225785ae AS |
847 | |
848 | /* Wait for the data to be received */ | |
849 | rc = sleep_thread(common, false, bh); | |
850 | if (rc) | |
851 | return rc; | |
852 | ||
853 | common->next_buffhd_to_drain = bh->next; | |
854 | bh->state = BUF_STATE_EMPTY; | |
855 | ||
856 | /* Did something go wrong with the transfer? */ | |
857 | if (bh->outreq->status != 0) { | |
858 | curlun->sense_data = SS_COMMUNICATION_FAILURE; | |
859 | curlun->sense_data_info = | |
3f565a36 | 860 | file_offset >> curlun->blkbits; |
225785ae AS |
861 | curlun->info_valid = 1; |
862 | break; | |
863 | } | |
d5e2b67a | 864 | |
225785ae AS |
865 | amount = bh->outreq->actual; |
866 | if (curlun->file_length - file_offset < amount) { | |
867 | LERROR(curlun, "write %u @ %llu beyond end %llu\n", | |
b73af61e MN |
868 | amount, (unsigned long long)file_offset, |
869 | (unsigned long long)curlun->file_length); | |
225785ae AS |
870 | amount = curlun->file_length - file_offset; |
871 | } | |
d5e2b67a | 872 | |
225785ae AS |
873 | /* |
874 | * Don't accept excess data. The spec doesn't say | |
875 | * what to do in this case. We'll ignore the error. | |
876 | */ | |
877 | amount = min(amount, bh->bulk_out_intended_length); | |
d5e2b67a | 878 | |
225785ae AS |
879 | /* Don't write a partial block */ |
880 | amount = round_down(amount, curlun->blksize); | |
881 | if (amount == 0) | |
882 | goto empty_write; | |
883 | ||
884 | /* Perform the write */ | |
885 | file_offset_tmp = file_offset; | |
886 | nwritten = vfs_write(curlun->filp, (char __user *)bh->buf, | |
887 | amount, &file_offset_tmp); | |
888 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, | |
889 | (unsigned long long)file_offset, (int)nwritten); | |
890 | if (signal_pending(current)) | |
891 | return -EINTR; /* Interrupted! */ | |
892 | ||
893 | if (nwritten < 0) { | |
894 | LDBG(curlun, "error in file write: %d\n", | |
895 | (int) nwritten); | |
896 | nwritten = 0; | |
897 | } else if (nwritten < amount) { | |
898 | LDBG(curlun, "partial file write: %d/%u\n", | |
899 | (int) nwritten, amount); | |
900 | nwritten = round_down(nwritten, curlun->blksize); | |
901 | } | |
902 | file_offset += nwritten; | |
903 | amount_left_to_write -= nwritten; | |
904 | common->residue -= nwritten; | |
905 | ||
906 | /* If an error occurred, report it and its position */ | |
907 | if (nwritten < amount) { | |
908 | curlun->sense_data = SS_WRITE_ERROR; | |
909 | curlun->sense_data_info = | |
3f565a36 | 910 | file_offset >> curlun->blkbits; |
225785ae AS |
911 | curlun->info_valid = 1; |
912 | break; | |
913 | } | |
d5e2b67a | 914 | |
04eee25b | 915 | empty_write: |
225785ae AS |
916 | /* Did the host decide to stop early? */ |
917 | if (bh->outreq->actual < bh->bulk_out_intended_length) { | |
918 | common->short_packet_received = 1; | |
919 | break; | |
d5e2b67a | 920 | } |
d5e2b67a MN |
921 | } |
922 | ||
d26a6aa0 | 923 | return -EIO; /* No default reply */ |
d5e2b67a MN |
924 | } |
925 | ||
926 | ||
927 | /*-------------------------------------------------------------------------*/ | |
928 | ||
8ea864cf | 929 | static int do_synchronize_cache(struct fsg_common *common) |
d5e2b67a | 930 | { |
8ea864cf | 931 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
932 | int rc; |
933 | ||
934 | /* We ignore the requested LBA and write out all file's | |
935 | * dirty data buffers. */ | |
936 | rc = fsg_lun_fsync_sub(curlun); | |
937 | if (rc) | |
938 | curlun->sense_data = SS_WRITE_ERROR; | |
939 | return 0; | |
940 | } | |
941 | ||
942 | ||
943 | /*-------------------------------------------------------------------------*/ | |
944 | ||
945 | static void invalidate_sub(struct fsg_lun *curlun) | |
946 | { | |
947 | struct file *filp = curlun->filp; | |
496ad9aa | 948 | struct inode *inode = file_inode(filp); |
d5e2b67a MN |
949 | unsigned long rc; |
950 | ||
951 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); | |
2ecdc82e | 952 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc); |
d5e2b67a MN |
953 | } |
954 | ||
8ea864cf | 955 | static int do_verify(struct fsg_common *common) |
d5e2b67a | 956 | { |
8ea864cf | 957 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
958 | u32 lba; |
959 | u32 verification_length; | |
8ea864cf | 960 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
961 | loff_t file_offset, file_offset_tmp; |
962 | u32 amount_left; | |
963 | unsigned int amount; | |
964 | ssize_t nread; | |
965 | ||
b73af61e MN |
966 | /* |
967 | * Get the starting Logical Block Address and check that it's | |
968 | * not too big. | |
969 | */ | |
8ea864cf | 970 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a MN |
971 | if (lba >= curlun->num_sectors) { |
972 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
973 | return -EINVAL; | |
974 | } | |
975 | ||
b73af61e MN |
976 | /* |
977 | * We allow DPO (Disable Page Out = don't save data in the | |
978 | * cache) but we don't implement it. | |
979 | */ | |
8ea864cf | 980 | if (common->cmnd[1] & ~0x10) { |
d5e2b67a MN |
981 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
982 | return -EINVAL; | |
983 | } | |
984 | ||
8ea864cf | 985 | verification_length = get_unaligned_be16(&common->cmnd[7]); |
d5e2b67a | 986 | if (unlikely(verification_length == 0)) |
d26a6aa0 | 987 | return -EIO; /* No default reply */ |
d5e2b67a MN |
988 | |
989 | /* Prepare to carry out the file verify */ | |
3f565a36 PL |
990 | amount_left = verification_length << curlun->blkbits; |
991 | file_offset = ((loff_t) lba) << curlun->blkbits; | |
d5e2b67a MN |
992 | |
993 | /* Write out all the dirty buffers before invalidating them */ | |
994 | fsg_lun_fsync_sub(curlun); | |
995 | if (signal_pending(current)) | |
996 | return -EINTR; | |
997 | ||
998 | invalidate_sub(curlun); | |
999 | if (signal_pending(current)) | |
1000 | return -EINTR; | |
1001 | ||
1002 | /* Just try to read the requested blocks */ | |
1003 | while (amount_left > 0) { | |
b73af61e MN |
1004 | /* |
1005 | * Figure out how much we need to read: | |
d5e2b67a MN |
1006 | * Try to read the remaining amount, but not more than |
1007 | * the buffer size. | |
1008 | * And don't try to read past the end of the file. | |
b73af61e | 1009 | */ |
93bcf12e | 1010 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
1011 | amount = min((loff_t)amount, |
1012 | curlun->file_length - file_offset); | |
d5e2b67a MN |
1013 | if (amount == 0) { |
1014 | curlun->sense_data = | |
1015 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
1016 | curlun->sense_data_info = |
1017 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1018 | curlun->info_valid = 1; |
1019 | break; | |
1020 | } | |
1021 | ||
1022 | /* Perform the read */ | |
1023 | file_offset_tmp = file_offset; | |
1024 | nread = vfs_read(curlun->filp, | |
1025 | (char __user *) bh->buf, | |
1026 | amount, &file_offset_tmp); | |
1027 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1028 | (unsigned long long) file_offset, | |
1029 | (int) nread); | |
1030 | if (signal_pending(current)) | |
1031 | return -EINTR; | |
1032 | ||
1033 | if (nread < 0) { | |
b73af61e | 1034 | LDBG(curlun, "error in file verify: %d\n", (int)nread); |
d5e2b67a MN |
1035 | nread = 0; |
1036 | } else if (nread < amount) { | |
1037 | LDBG(curlun, "partial file verify: %d/%u\n", | |
b73af61e | 1038 | (int)nread, amount); |
3f565a36 | 1039 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
1040 | } |
1041 | if (nread == 0) { | |
1042 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
1043 | curlun->sense_data_info = |
1044 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1045 | curlun->info_valid = 1; |
1046 | break; | |
1047 | } | |
1048 | file_offset += nread; | |
1049 | amount_left -= nread; | |
1050 | } | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | ||
1055 | /*-------------------------------------------------------------------------*/ | |
1056 | ||
8ea864cf | 1057 | static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1058 | { |
8ea864cf | 1059 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1060 | u8 *buf = (u8 *) bh->buf; |
1061 | ||
481e4929 | 1062 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1063 | common->bad_lun_okay = 1; |
d5e2b67a | 1064 | memset(buf, 0, 36); |
fddc26f5 | 1065 | buf[0] = TYPE_NO_LUN; /* Unsupported, no device-type */ |
d26a6aa0 | 1066 | buf[4] = 31; /* Additional length */ |
d5e2b67a MN |
1067 | return 36; |
1068 | } | |
1069 | ||
0a6a717c | 1070 | buf[0] = curlun->cdrom ? TYPE_ROM : TYPE_DISK; |
481e4929 | 1071 | buf[1] = curlun->removable ? 0x80 : 0; |
d26a6aa0 MN |
1072 | buf[2] = 2; /* ANSI SCSI level 2 */ |
1073 | buf[3] = 2; /* SCSI-2 INQUIRY data format */ | |
1074 | buf[4] = 31; /* Additional length */ | |
1075 | buf[5] = 0; /* No special options */ | |
481e4929 MN |
1076 | buf[6] = 0; |
1077 | buf[7] = 0; | |
6ac47090 PG |
1078 | if (curlun->inquiry_string[0]) |
1079 | memcpy(buf + 8, curlun->inquiry_string, | |
1080 | sizeof(curlun->inquiry_string)); | |
1081 | else | |
1082 | memcpy(buf + 8, common->inquiry_string, | |
1083 | sizeof(common->inquiry_string)); | |
d5e2b67a MN |
1084 | return 36; |
1085 | } | |
1086 | ||
8ea864cf | 1087 | static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1088 | { |
8ea864cf | 1089 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1090 | u8 *buf = (u8 *) bh->buf; |
1091 | u32 sd, sdinfo; | |
1092 | int valid; | |
1093 | ||
1094 | /* | |
1095 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): | |
1096 | * | |
1097 | * If a REQUEST SENSE command is received from an initiator | |
1098 | * with a pending unit attention condition (before the target | |
1099 | * generates the contingent allegiance condition), then the | |
1100 | * target shall either: | |
1101 | * a) report any pending sense data and preserve the unit | |
1102 | * attention condition on the logical unit, or, | |
1103 | * b) report the unit attention condition, may discard any | |
1104 | * pending sense data, and clear the unit attention | |
1105 | * condition on the logical unit for that initiator. | |
1106 | * | |
1107 | * FSG normally uses option a); enable this code to use option b). | |
1108 | */ | |
1109 | #if 0 | |
1110 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { | |
1111 | curlun->sense_data = curlun->unit_attention_data; | |
1112 | curlun->unit_attention_data = SS_NO_SENSE; | |
1113 | } | |
1114 | #endif | |
1115 | ||
d26a6aa0 | 1116 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1117 | common->bad_lun_okay = 1; |
d5e2b67a MN |
1118 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
1119 | sdinfo = 0; | |
1120 | valid = 0; | |
1121 | } else { | |
1122 | sd = curlun->sense_data; | |
1123 | sdinfo = curlun->sense_data_info; | |
1124 | valid = curlun->info_valid << 7; | |
1125 | curlun->sense_data = SS_NO_SENSE; | |
1126 | curlun->sense_data_info = 0; | |
1127 | curlun->info_valid = 0; | |
1128 | } | |
1129 | ||
1130 | memset(buf, 0, 18); | |
d26a6aa0 | 1131 | buf[0] = valid | 0x70; /* Valid, current error */ |
d5e2b67a MN |
1132 | buf[2] = SK(sd); |
1133 | put_unaligned_be32(sdinfo, &buf[3]); /* Sense information */ | |
d26a6aa0 | 1134 | buf[7] = 18 - 8; /* Additional sense length */ |
d5e2b67a MN |
1135 | buf[12] = ASC(sd); |
1136 | buf[13] = ASCQ(sd); | |
1137 | return 18; | |
1138 | } | |
1139 | ||
8ea864cf | 1140 | static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1141 | { |
8ea864cf MN |
1142 | struct fsg_lun *curlun = common->curlun; |
1143 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
1144 | int pmi = common->cmnd[8]; | |
b73af61e | 1145 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a MN |
1146 | |
1147 | /* Check the PMI and LBA fields */ | |
1148 | if (pmi > 1 || (pmi == 0 && lba != 0)) { | |
1149 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1150 | return -EINVAL; | |
1151 | } | |
1152 | ||
1153 | put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); | |
1154 | /* Max logical block */ | |
3f565a36 | 1155 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1156 | return 8; |
1157 | } | |
1158 | ||
8ea864cf | 1159 | static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1160 | { |
8ea864cf MN |
1161 | struct fsg_lun *curlun = common->curlun; |
1162 | int msf = common->cmnd[1] & 0x02; | |
1163 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
b73af61e | 1164 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1165 | |
8ea864cf | 1166 | if (common->cmnd[1] & ~0x02) { /* Mask away MSF */ |
d5e2b67a MN |
1167 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1168 | return -EINVAL; | |
1169 | } | |
1170 | if (lba >= curlun->num_sectors) { | |
1171 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1172 | return -EINVAL; | |
1173 | } | |
1174 | ||
1175 | memset(buf, 0, 8); | |
1176 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ | |
1177 | store_cdrom_address(&buf[4], msf, lba); | |
1178 | return 8; | |
1179 | } | |
1180 | ||
8ea864cf | 1181 | static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1182 | { |
8ea864cf MN |
1183 | struct fsg_lun *curlun = common->curlun; |
1184 | int msf = common->cmnd[1] & 0x02; | |
1185 | int start_track = common->cmnd[6]; | |
b73af61e | 1186 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1187 | |
8ea864cf | 1188 | if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ |
d5e2b67a MN |
1189 | start_track > 1) { |
1190 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | ||
1194 | memset(buf, 0, 20); | |
1195 | buf[1] = (20-2); /* TOC data length */ | |
1196 | buf[2] = 1; /* First track number */ | |
1197 | buf[3] = 1; /* Last track number */ | |
1198 | buf[5] = 0x16; /* Data track, copying allowed */ | |
1199 | buf[6] = 0x01; /* Only track is number 1 */ | |
1200 | store_cdrom_address(&buf[8], msf, 0); | |
1201 | ||
1202 | buf[13] = 0x16; /* Lead-out track is data */ | |
1203 | buf[14] = 0xAA; /* Lead-out track number */ | |
1204 | store_cdrom_address(&buf[16], msf, curlun->num_sectors); | |
1205 | return 20; | |
1206 | } | |
1207 | ||
8ea864cf | 1208 | static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1209 | { |
8ea864cf MN |
1210 | struct fsg_lun *curlun = common->curlun; |
1211 | int mscmnd = common->cmnd[0]; | |
d5e2b67a MN |
1212 | u8 *buf = (u8 *) bh->buf; |
1213 | u8 *buf0 = buf; | |
1214 | int pc, page_code; | |
1215 | int changeable_values, all_pages; | |
1216 | int valid_page = 0; | |
1217 | int len, limit; | |
1218 | ||
8ea864cf | 1219 | if ((common->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ |
d5e2b67a MN |
1220 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1221 | return -EINVAL; | |
1222 | } | |
8ea864cf MN |
1223 | pc = common->cmnd[2] >> 6; |
1224 | page_code = common->cmnd[2] & 0x3f; | |
d5e2b67a MN |
1225 | if (pc == 3) { |
1226 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | changeable_values = (pc == 1); | |
1230 | all_pages = (page_code == 0x3f); | |
1231 | ||
b73af61e MN |
1232 | /* |
1233 | * Write the mode parameter header. Fixed values are: default | |
d5e2b67a MN |
1234 | * medium type, no cache control (DPOFUA), and no block descriptors. |
1235 | * The only variable value is the WriteProtect bit. We will fill in | |
b73af61e MN |
1236 | * the mode data length later. |
1237 | */ | |
d5e2b67a | 1238 | memset(buf, 0, 8); |
0a6a717c | 1239 | if (mscmnd == MODE_SENSE) { |
d26a6aa0 | 1240 | buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a MN |
1241 | buf += 4; |
1242 | limit = 255; | |
0a6a717c | 1243 | } else { /* MODE_SENSE_10 */ |
d26a6aa0 | 1244 | buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a | 1245 | buf += 8; |
d26a6aa0 | 1246 | limit = 65535; /* Should really be FSG_BUFLEN */ |
d5e2b67a MN |
1247 | } |
1248 | ||
1249 | /* No block descriptors */ | |
1250 | ||
b73af61e MN |
1251 | /* |
1252 | * The mode pages, in numerical order. The only page we support | |
1253 | * is the Caching page. | |
1254 | */ | |
d5e2b67a MN |
1255 | if (page_code == 0x08 || all_pages) { |
1256 | valid_page = 1; | |
d26a6aa0 MN |
1257 | buf[0] = 0x08; /* Page code */ |
1258 | buf[1] = 10; /* Page length */ | |
1259 | memset(buf+2, 0, 10); /* None of the fields are changeable */ | |
d5e2b67a MN |
1260 | |
1261 | if (!changeable_values) { | |
d26a6aa0 MN |
1262 | buf[2] = 0x04; /* Write cache enable, */ |
1263 | /* Read cache not disabled */ | |
1264 | /* No cache retention priorities */ | |
d5e2b67a MN |
1265 | put_unaligned_be16(0xffff, &buf[4]); |
1266 | /* Don't disable prefetch */ | |
1267 | /* Minimum prefetch = 0 */ | |
1268 | put_unaligned_be16(0xffff, &buf[8]); | |
1269 | /* Maximum prefetch */ | |
1270 | put_unaligned_be16(0xffff, &buf[10]); | |
1271 | /* Maximum prefetch ceiling */ | |
1272 | } | |
1273 | buf += 12; | |
1274 | } | |
1275 | ||
b73af61e MN |
1276 | /* |
1277 | * Check that a valid page was requested and the mode data length | |
1278 | * isn't too long. | |
1279 | */ | |
d5e2b67a MN |
1280 | len = buf - buf0; |
1281 | if (!valid_page || len > limit) { | |
1282 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1283 | return -EINVAL; | |
1284 | } | |
1285 | ||
1286 | /* Store the mode data length */ | |
0a6a717c | 1287 | if (mscmnd == MODE_SENSE) |
d5e2b67a MN |
1288 | buf0[0] = len - 1; |
1289 | else | |
1290 | put_unaligned_be16(len - 2, buf0); | |
1291 | return len; | |
1292 | } | |
1293 | ||
8ea864cf | 1294 | static int do_start_stop(struct fsg_common *common) |
d5e2b67a | 1295 | { |
31436a1a FC |
1296 | struct fsg_lun *curlun = common->curlun; |
1297 | int loej, start; | |
1298 | ||
1299 | if (!curlun) { | |
481e4929 | 1300 | return -EINVAL; |
31436a1a FC |
1301 | } else if (!curlun->removable) { |
1302 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a | 1303 | return -EINVAL; |
8876f5e7 MN |
1304 | } else if ((common->cmnd[1] & ~0x01) != 0 || /* Mask away Immed */ |
1305 | (common->cmnd[4] & ~0x03) != 0) { /* Mask LoEj, Start */ | |
31436a1a FC |
1306 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1307 | return -EINVAL; | |
1308 | } | |
1309 | ||
8876f5e7 MN |
1310 | loej = common->cmnd[4] & 0x02; |
1311 | start = common->cmnd[4] & 0x01; | |
31436a1a | 1312 | |
b73af61e MN |
1313 | /* |
1314 | * Our emulation doesn't support mounting; the medium is | |
1315 | * available for use as soon as it is loaded. | |
1316 | */ | |
8876f5e7 | 1317 | if (start) { |
31436a1a FC |
1318 | if (!fsg_lun_is_open(curlun)) { |
1319 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1320 | return -EINVAL; | |
1321 | } | |
8876f5e7 | 1322 | return 0; |
31436a1a | 1323 | } |
8876f5e7 MN |
1324 | |
1325 | /* Are we allowed to unload the media? */ | |
1326 | if (curlun->prevent_medium_removal) { | |
1327 | LDBG(curlun, "unload attempt prevented\n"); | |
1328 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; | |
1329 | return -EINVAL; | |
1330 | } | |
1331 | ||
1332 | if (!loej) | |
1333 | return 0; | |
1334 | ||
8876f5e7 MN |
1335 | up_read(&common->filesem); |
1336 | down_write(&common->filesem); | |
1337 | fsg_lun_close(curlun); | |
1338 | up_write(&common->filesem); | |
1339 | down_read(&common->filesem); | |
1340 | ||
2b508002 | 1341 | return 0; |
d5e2b67a MN |
1342 | } |
1343 | ||
8ea864cf | 1344 | static int do_prevent_allow(struct fsg_common *common) |
d5e2b67a | 1345 | { |
8ea864cf | 1346 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1347 | int prevent; |
1348 | ||
8ea864cf | 1349 | if (!common->curlun) { |
481e4929 | 1350 | return -EINVAL; |
8ea864cf MN |
1351 | } else if (!common->curlun->removable) { |
1352 | common->curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1353 | return -EINVAL; |
1354 | } | |
1355 | ||
8ea864cf MN |
1356 | prevent = common->cmnd[4] & 0x01; |
1357 | if ((common->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */ | |
d5e2b67a MN |
1358 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1359 | return -EINVAL; | |
1360 | } | |
1361 | ||
1362 | if (curlun->prevent_medium_removal && !prevent) | |
1363 | fsg_lun_fsync_sub(curlun); | |
1364 | curlun->prevent_medium_removal = prevent; | |
1365 | return 0; | |
1366 | } | |
1367 | ||
8ea864cf | 1368 | static int do_read_format_capacities(struct fsg_common *common, |
d5e2b67a MN |
1369 | struct fsg_buffhd *bh) |
1370 | { | |
8ea864cf | 1371 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1372 | u8 *buf = (u8 *) bh->buf; |
1373 | ||
1374 | buf[0] = buf[1] = buf[2] = 0; | |
d26a6aa0 | 1375 | buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ |
d5e2b67a MN |
1376 | buf += 4; |
1377 | ||
1378 | put_unaligned_be32(curlun->num_sectors, &buf[0]); | |
1379 | /* Number of blocks */ | |
3f565a36 | 1380 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1381 | buf[4] = 0x02; /* Current capacity */ |
1382 | return 12; | |
1383 | } | |
1384 | ||
8ea864cf | 1385 | static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1386 | { |
8ea864cf | 1387 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1388 | |
1389 | /* We don't support MODE SELECT */ | |
8ea864cf MN |
1390 | if (curlun) |
1391 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1392 | return -EINVAL; |
1393 | } | |
1394 | ||
1395 | ||
1396 | /*-------------------------------------------------------------------------*/ | |
1397 | ||
1398 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) | |
1399 | { | |
1400 | int rc; | |
1401 | ||
1402 | rc = fsg_set_halt(fsg, fsg->bulk_in); | |
1403 | if (rc == -EAGAIN) | |
1404 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); | |
1405 | while (rc != 0) { | |
1406 | if (rc != -EAGAIN) { | |
1407 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); | |
1408 | rc = 0; | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | /* Wait for a short time and then try again */ | |
1413 | if (msleep_interruptible(100) != 0) | |
1414 | return -EINTR; | |
1415 | rc = usb_ep_set_halt(fsg->bulk_in); | |
1416 | } | |
1417 | return rc; | |
1418 | } | |
1419 | ||
1420 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) | |
1421 | { | |
1422 | int rc; | |
1423 | ||
1424 | DBG(fsg, "bulk-in set wedge\n"); | |
1425 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1426 | if (rc == -EAGAIN) | |
1427 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); | |
1428 | while (rc != 0) { | |
1429 | if (rc != -EAGAIN) { | |
1430 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); | |
1431 | rc = 0; | |
1432 | break; | |
1433 | } | |
1434 | ||
1435 | /* Wait for a short time and then try again */ | |
1436 | if (msleep_interruptible(100) != 0) | |
1437 | return -EINTR; | |
1438 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1439 | } | |
1440 | return rc; | |
1441 | } | |
1442 | ||
8ea864cf | 1443 | static int throw_away_data(struct fsg_common *common) |
d5e2b67a | 1444 | { |
225785ae | 1445 | struct fsg_buffhd *bh, *bh2; |
d5e2b67a MN |
1446 | u32 amount; |
1447 | int rc; | |
1448 | ||
8ea864cf MN |
1449 | for (bh = common->next_buffhd_to_drain; |
1450 | bh->state != BUF_STATE_EMPTY || common->usb_amount_left > 0; | |
1451 | bh = common->next_buffhd_to_drain) { | |
d5e2b67a | 1452 | |
d5e2b67a | 1453 | /* Try to submit another request if we need one */ |
225785ae AS |
1454 | bh2 = common->next_buffhd_to_fill; |
1455 | if (bh2->state == BUF_STATE_EMPTY && | |
1456 | common->usb_amount_left > 0) { | |
8ea864cf | 1457 | amount = min(common->usb_amount_left, FSG_BUFLEN); |
d5e2b67a | 1458 | |
b73af61e | 1459 | /* |
04eee25b AS |
1460 | * Except at the end of the transfer, amount will be |
1461 | * equal to the buffer size, which is divisible by | |
b73af61e MN |
1462 | * the bulk-out maxpacket size. |
1463 | */ | |
225785ae AS |
1464 | set_bulk_out_req_length(common, bh2, amount); |
1465 | if (!start_out_transfer(common, bh2)) | |
b73af61e | 1466 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf | 1467 | return -EIO; |
225785ae | 1468 | common->next_buffhd_to_fill = bh2->next; |
8ea864cf | 1469 | common->usb_amount_left -= amount; |
d5e2b67a MN |
1470 | continue; |
1471 | } | |
1472 | ||
225785ae AS |
1473 | /* Wait for the data to be received */ |
1474 | rc = sleep_thread(common, false, bh); | |
d5e2b67a MN |
1475 | if (rc) |
1476 | return rc; | |
225785ae AS |
1477 | |
1478 | /* Throw away the data in a filled buffer */ | |
1479 | bh->state = BUF_STATE_EMPTY; | |
1480 | common->next_buffhd_to_drain = bh->next; | |
1481 | ||
1482 | /* A short packet or an error ends everything */ | |
1483 | if (bh->outreq->actual < bh->bulk_out_intended_length || | |
1484 | bh->outreq->status != 0) { | |
1485 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
1486 | return -EINTR; | |
1487 | } | |
d5e2b67a MN |
1488 | } |
1489 | return 0; | |
1490 | } | |
1491 | ||
8ea864cf | 1492 | static int finish_reply(struct fsg_common *common) |
d5e2b67a | 1493 | { |
8ea864cf | 1494 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
1495 | int rc = 0; |
1496 | ||
8ea864cf | 1497 | switch (common->data_dir) { |
d5e2b67a | 1498 | case DATA_DIR_NONE: |
d26a6aa0 | 1499 | break; /* Nothing to send */ |
d5e2b67a | 1500 | |
b73af61e MN |
1501 | /* |
1502 | * If we don't know whether the host wants to read or write, | |
d5e2b67a MN |
1503 | * this must be CB or CBI with an unknown command. We mustn't |
1504 | * try to send or receive any data. So stall both bulk pipes | |
b73af61e MN |
1505 | * if we can and wait for a reset. |
1506 | */ | |
d5e2b67a | 1507 | case DATA_DIR_UNKNOWN: |
8ea864cf MN |
1508 | if (!common->can_stall) { |
1509 | /* Nothing */ | |
1510 | } else if (fsg_is_set(common)) { | |
1511 | fsg_set_halt(common->fsg, common->fsg->bulk_out); | |
1512 | rc = halt_bulk_in_endpoint(common->fsg); | |
1513 | } else { | |
1514 | /* Don't know what to do if common->fsg is NULL */ | |
1515 | rc = -EIO; | |
d5e2b67a MN |
1516 | } |
1517 | break; | |
1518 | ||
1519 | /* All but the last buffer of data must have already been sent */ | |
1520 | case DATA_DIR_TO_HOST: | |
8ea864cf | 1521 | if (common->data_size == 0) { |
93bcf12e | 1522 | /* Nothing to send */ |
d5e2b67a | 1523 | |
ee81b3e0 AS |
1524 | /* Don't know what to do if common->fsg is NULL */ |
1525 | } else if (!fsg_is_set(common)) { | |
1526 | rc = -EIO; | |
1527 | ||
d5e2b67a | 1528 | /* If there's no residue, simply send the last buffer */ |
8ea864cf | 1529 | } else if (common->residue == 0) { |
d5e2b67a | 1530 | bh->inreq->zero = 0; |
fe52f792 | 1531 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1532 | return -EIO; |
1533 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a | 1534 | |
b73af61e | 1535 | /* |
ee81b3e0 AS |
1536 | * For Bulk-only, mark the end of the data with a short |
1537 | * packet. If we are allowed to stall, halt the bulk-in | |
1538 | * endpoint. (Note: This violates the Bulk-Only Transport | |
1539 | * specification, which requires us to pad the data if we | |
1540 | * don't halt the endpoint. Presumably nobody will mind.) | |
b73af61e | 1541 | */ |
ee81b3e0 | 1542 | } else { |
93bcf12e | 1543 | bh->inreq->zero = 1; |
fe52f792 | 1544 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1545 | rc = -EIO; |
1546 | common->next_buffhd_to_fill = bh->next; | |
ee81b3e0 | 1547 | if (common->can_stall) |
8ea864cf | 1548 | rc = halt_bulk_in_endpoint(common->fsg); |
d5e2b67a MN |
1549 | } |
1550 | break; | |
1551 | ||
b73af61e MN |
1552 | /* |
1553 | * We have processed all we want from the data the host has sent. | |
1554 | * There may still be outstanding bulk-out requests. | |
1555 | */ | |
d5e2b67a | 1556 | case DATA_DIR_FROM_HOST: |
8ea864cf | 1557 | if (common->residue == 0) { |
d26a6aa0 | 1558 | /* Nothing to receive */ |
d5e2b67a MN |
1559 | |
1560 | /* Did the host stop sending unexpectedly early? */ | |
8ea864cf MN |
1561 | } else if (common->short_packet_received) { |
1562 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1563 | rc = -EINTR; |
d5e2b67a | 1564 | |
b73af61e MN |
1565 | /* |
1566 | * We haven't processed all the incoming data. Even though | |
d5e2b67a MN |
1567 | * we may be allowed to stall, doing so would cause a race. |
1568 | * The controller may already have ACK'ed all the remaining | |
1569 | * bulk-out packets, in which case the host wouldn't see a | |
1570 | * STALL. Not realizing the endpoint was halted, it wouldn't | |
b73af61e MN |
1571 | * clear the halt -- leading to problems later on. |
1572 | */ | |
d5e2b67a | 1573 | #if 0 |
8ea864cf MN |
1574 | } else if (common->can_stall) { |
1575 | if (fsg_is_set(common)) | |
1576 | fsg_set_halt(common->fsg, | |
1577 | common->fsg->bulk_out); | |
1578 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1579 | rc = -EINTR; |
d5e2b67a MN |
1580 | #endif |
1581 | ||
b73af61e MN |
1582 | /* |
1583 | * We can't stall. Read in the excess data and throw it | |
1584 | * all away. | |
1585 | */ | |
d26a6aa0 | 1586 | } else { |
8ea864cf | 1587 | rc = throw_away_data(common); |
d26a6aa0 | 1588 | } |
d5e2b67a MN |
1589 | break; |
1590 | } | |
1591 | return rc; | |
1592 | } | |
1593 | ||
78db441d | 1594 | static void send_status(struct fsg_common *common) |
d5e2b67a | 1595 | { |
8ea864cf | 1596 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a | 1597 | struct fsg_buffhd *bh; |
93bcf12e | 1598 | struct bulk_cs_wrap *csw; |
d5e2b67a | 1599 | int rc; |
775dafdc | 1600 | u8 status = US_BULK_STAT_OK; |
d5e2b67a MN |
1601 | u32 sd, sdinfo = 0; |
1602 | ||
1603 | /* Wait for the next buffer to become available */ | |
8ea864cf | 1604 | bh = common->next_buffhd_to_fill; |
225785ae AS |
1605 | rc = sleep_thread(common, false, bh); |
1606 | if (rc) | |
1607 | return; | |
d5e2b67a MN |
1608 | |
1609 | if (curlun) { | |
1610 | sd = curlun->sense_data; | |
1611 | sdinfo = curlun->sense_data_info; | |
8ea864cf | 1612 | } else if (common->bad_lun_okay) |
d5e2b67a MN |
1613 | sd = SS_NO_SENSE; |
1614 | else | |
1615 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
1616 | ||
8ea864cf MN |
1617 | if (common->phase_error) { |
1618 | DBG(common, "sending phase-error status\n"); | |
775dafdc | 1619 | status = US_BULK_STAT_PHASE; |
d5e2b67a MN |
1620 | sd = SS_INVALID_COMMAND; |
1621 | } else if (sd != SS_NO_SENSE) { | |
8ea864cf | 1622 | DBG(common, "sending command-failure status\n"); |
775dafdc | 1623 | status = US_BULK_STAT_FAIL; |
8ea864cf | 1624 | VDBG(common, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" |
d5e2b67a MN |
1625 | " info x%x\n", |
1626 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); | |
1627 | } | |
1628 | ||
93bcf12e | 1629 | /* Store and send the Bulk-only CSW */ |
d26a6aa0 | 1630 | csw = (void *)bh->buf; |
d5e2b67a | 1631 | |
775dafdc | 1632 | csw->Signature = cpu_to_le32(US_BULK_CS_SIGN); |
8ea864cf MN |
1633 | csw->Tag = common->tag; |
1634 | csw->Residue = cpu_to_le32(common->residue); | |
93bcf12e | 1635 | csw->Status = status; |
d5e2b67a | 1636 | |
775dafdc | 1637 | bh->inreq->length = US_BULK_CS_WRAP_LEN; |
93bcf12e | 1638 | bh->inreq->zero = 0; |
fe52f792 | 1639 | if (!start_in_transfer(common, bh)) |
8ea864cf | 1640 | /* Don't know what to do if common->fsg is NULL */ |
78db441d | 1641 | return; |
d5e2b67a | 1642 | |
8ea864cf | 1643 | common->next_buffhd_to_fill = bh->next; |
78db441d | 1644 | return; |
d5e2b67a MN |
1645 | } |
1646 | ||
1647 | ||
1648 | /*-------------------------------------------------------------------------*/ | |
1649 | ||
b73af61e MN |
1650 | /* |
1651 | * Check whether the command is properly formed and whether its data size | |
1652 | * and direction agree with the values we already have. | |
1653 | */ | |
8ea864cf | 1654 | static int check_command(struct fsg_common *common, int cmnd_size, |
b73af61e MN |
1655 | enum data_direction data_dir, unsigned int mask, |
1656 | int needs_medium, const char *name) | |
d5e2b67a MN |
1657 | { |
1658 | int i; | |
98f3a1b9 | 1659 | unsigned int lun = common->cmnd[1] >> 5; |
d5e2b67a MN |
1660 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; |
1661 | char hdlen[20]; | |
1662 | struct fsg_lun *curlun; | |
1663 | ||
d5e2b67a | 1664 | hdlen[0] = 0; |
8ea864cf MN |
1665 | if (common->data_dir != DATA_DIR_UNKNOWN) |
1666 | sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir], | |
b73af61e | 1667 | common->data_size); |
8ea864cf | 1668 | VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", |
d26a6aa0 | 1669 | name, cmnd_size, dirletter[(int) data_dir], |
8ea864cf | 1670 | common->data_size_from_cmnd, common->cmnd_size, hdlen); |
d5e2b67a | 1671 | |
b73af61e MN |
1672 | /* |
1673 | * We can't reply at all until we know the correct data direction | |
1674 | * and size. | |
1675 | */ | |
8ea864cf | 1676 | if (common->data_size_from_cmnd == 0) |
d5e2b67a | 1677 | data_dir = DATA_DIR_NONE; |
8ea864cf | 1678 | if (common->data_size < common->data_size_from_cmnd) { |
b73af61e MN |
1679 | /* |
1680 | * Host data size < Device data size is a phase error. | |
8ea864cf | 1681 | * Carry out the command, but only transfer as much as |
b73af61e MN |
1682 | * we are allowed. |
1683 | */ | |
8ea864cf MN |
1684 | common->data_size_from_cmnd = common->data_size; |
1685 | common->phase_error = 1; | |
d5e2b67a | 1686 | } |
8ea864cf MN |
1687 | common->residue = common->data_size; |
1688 | common->usb_amount_left = common->data_size; | |
d5e2b67a MN |
1689 | |
1690 | /* Conflicting data directions is a phase error */ | |
b73af61e | 1691 | if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) { |
8ea864cf | 1692 | common->phase_error = 1; |
d5e2b67a MN |
1693 | return -EINVAL; |
1694 | } | |
1695 | ||
1696 | /* Verify the length of the command itself */ | |
8ea864cf | 1697 | if (cmnd_size != common->cmnd_size) { |
d5e2b67a | 1698 | |
b73af61e MN |
1699 | /* |
1700 | * Special case workaround: There are plenty of buggy SCSI | |
d5e2b67a MN |
1701 | * implementations. Many have issues with cbw->Length |
1702 | * field passing a wrong command size. For those cases we | |
1703 | * always try to work around the problem by using the length | |
1704 | * sent by the host side provided it is at least as large | |
1705 | * as the correct command length. | |
1706 | * Examples of such cases would be MS-Windows, which issues | |
1707 | * REQUEST SENSE with cbw->Length == 12 where it should | |
1708 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and | |
1709 | * REQUEST SENSE with cbw->Length == 10 where it should | |
1710 | * be 6 as well. | |
1711 | */ | |
8ea864cf MN |
1712 | if (cmnd_size <= common->cmnd_size) { |
1713 | DBG(common, "%s is buggy! Expected length %d " | |
a41ae418 | 1714 | "but we got %d\n", name, |
8ea864cf MN |
1715 | cmnd_size, common->cmnd_size); |
1716 | cmnd_size = common->cmnd_size; | |
d5e2b67a | 1717 | } else { |
8ea864cf | 1718 | common->phase_error = 1; |
d5e2b67a MN |
1719 | return -EINVAL; |
1720 | } | |
1721 | } | |
1722 | ||
1723 | /* Check that the LUN values are consistent */ | |
8ea864cf | 1724 | if (common->lun != lun) |
98f3a1b9 | 1725 | DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n", |
8ea864cf | 1726 | common->lun, lun); |
d5e2b67a MN |
1727 | |
1728 | /* Check the LUN */ | |
144974e7 YL |
1729 | curlun = common->curlun; |
1730 | if (curlun) { | |
0a6a717c | 1731 | if (common->cmnd[0] != REQUEST_SENSE) { |
d5e2b67a MN |
1732 | curlun->sense_data = SS_NO_SENSE; |
1733 | curlun->sense_data_info = 0; | |
1734 | curlun->info_valid = 0; | |
1735 | } | |
1736 | } else { | |
8ea864cf | 1737 | common->bad_lun_okay = 0; |
d5e2b67a | 1738 | |
b73af61e MN |
1739 | /* |
1740 | * INQUIRY and REQUEST SENSE commands are explicitly allowed | |
1741 | * to use unsupported LUNs; all others may not. | |
1742 | */ | |
0a6a717c MN |
1743 | if (common->cmnd[0] != INQUIRY && |
1744 | common->cmnd[0] != REQUEST_SENSE) { | |
98f3a1b9 | 1745 | DBG(common, "unsupported LUN %u\n", common->lun); |
d5e2b67a MN |
1746 | return -EINVAL; |
1747 | } | |
1748 | } | |
1749 | ||
b73af61e MN |
1750 | /* |
1751 | * If a unit attention condition exists, only INQUIRY and | |
1752 | * REQUEST SENSE commands are allowed; anything else must fail. | |
1753 | */ | |
d5e2b67a | 1754 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE && |
b73af61e MN |
1755 | common->cmnd[0] != INQUIRY && |
1756 | common->cmnd[0] != REQUEST_SENSE) { | |
d5e2b67a MN |
1757 | curlun->sense_data = curlun->unit_attention_data; |
1758 | curlun->unit_attention_data = SS_NO_SENSE; | |
1759 | return -EINVAL; | |
1760 | } | |
1761 | ||
1762 | /* Check that only command bytes listed in the mask are non-zero */ | |
8ea864cf | 1763 | common->cmnd[1] &= 0x1f; /* Mask away the LUN */ |
d5e2b67a | 1764 | for (i = 1; i < cmnd_size; ++i) { |
8ea864cf | 1765 | if (common->cmnd[i] && !(mask & (1 << i))) { |
d5e2b67a MN |
1766 | if (curlun) |
1767 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1768 | return -EINVAL; | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | /* If the medium isn't mounted and the command needs to access | |
1773 | * it, return an error. */ | |
1774 | if (curlun && !fsg_lun_is_open(curlun) && needs_medium) { | |
1775 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1776 | return -EINVAL; | |
1777 | } | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
144974e7 YL |
1782 | /* wrapper of check_command for data size in blocks handling */ |
1783 | static int check_command_size_in_blocks(struct fsg_common *common, | |
1784 | int cmnd_size, enum data_direction data_dir, | |
1785 | unsigned int mask, int needs_medium, const char *name) | |
1786 | { | |
1787 | if (common->curlun) | |
1788 | common->data_size_from_cmnd <<= common->curlun->blkbits; | |
1789 | return check_command(common, cmnd_size, data_dir, | |
1790 | mask, needs_medium, name); | |
1791 | } | |
1792 | ||
8ea864cf | 1793 | static int do_scsi_command(struct fsg_common *common) |
d5e2b67a MN |
1794 | { |
1795 | struct fsg_buffhd *bh; | |
1796 | int rc; | |
1797 | int reply = -EINVAL; | |
1798 | int i; | |
1799 | static char unknown[16]; | |
1800 | ||
8ea864cf | 1801 | dump_cdb(common); |
d5e2b67a MN |
1802 | |
1803 | /* Wait for the next buffer to become available for data or status */ | |
8ea864cf MN |
1804 | bh = common->next_buffhd_to_fill; |
1805 | common->next_buffhd_to_drain = bh; | |
225785ae AS |
1806 | rc = sleep_thread(common, false, bh); |
1807 | if (rc) | |
1808 | return rc; | |
1809 | ||
8ea864cf MN |
1810 | common->phase_error = 0; |
1811 | common->short_packet_received = 0; | |
d5e2b67a | 1812 | |
8ea864cf MN |
1813 | down_read(&common->filesem); /* We're using the backing file */ |
1814 | switch (common->cmnd[0]) { | |
d5e2b67a | 1815 | |
0a6a717c | 1816 | case INQUIRY: |
8ea864cf MN |
1817 | common->data_size_from_cmnd = common->cmnd[4]; |
1818 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1819 | (1<<4), 0, |
1820 | "INQUIRY"); | |
1821 | if (reply == 0) | |
8ea864cf | 1822 | reply = do_inquiry(common, bh); |
d5e2b67a MN |
1823 | break; |
1824 | ||
0a6a717c | 1825 | case MODE_SELECT: |
8ea864cf MN |
1826 | common->data_size_from_cmnd = common->cmnd[4]; |
1827 | reply = check_command(common, 6, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1828 | (1<<1) | (1<<4), 0, |
1829 | "MODE SELECT(6)"); | |
1830 | if (reply == 0) | |
8ea864cf | 1831 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1832 | break; |
1833 | ||
0a6a717c | 1834 | case MODE_SELECT_10: |
8ea864cf MN |
1835 | common->data_size_from_cmnd = |
1836 | get_unaligned_be16(&common->cmnd[7]); | |
1837 | reply = check_command(common, 10, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1838 | (1<<1) | (3<<7), 0, |
1839 | "MODE SELECT(10)"); | |
1840 | if (reply == 0) | |
8ea864cf | 1841 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1842 | break; |
1843 | ||
0a6a717c | 1844 | case MODE_SENSE: |
8ea864cf MN |
1845 | common->data_size_from_cmnd = common->cmnd[4]; |
1846 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1847 | (1<<1) | (1<<2) | (1<<4), 0, |
1848 | "MODE SENSE(6)"); | |
1849 | if (reply == 0) | |
8ea864cf | 1850 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1851 | break; |
1852 | ||
0a6a717c | 1853 | case MODE_SENSE_10: |
8ea864cf MN |
1854 | common->data_size_from_cmnd = |
1855 | get_unaligned_be16(&common->cmnd[7]); | |
1856 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1857 | (1<<1) | (1<<2) | (3<<7), 0, |
1858 | "MODE SENSE(10)"); | |
1859 | if (reply == 0) | |
8ea864cf | 1860 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1861 | break; |
1862 | ||
0a6a717c | 1863 | case ALLOW_MEDIUM_REMOVAL: |
8ea864cf MN |
1864 | common->data_size_from_cmnd = 0; |
1865 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1866 | (1<<4), 0, |
1867 | "PREVENT-ALLOW MEDIUM REMOVAL"); | |
1868 | if (reply == 0) | |
8ea864cf | 1869 | reply = do_prevent_allow(common); |
d5e2b67a MN |
1870 | break; |
1871 | ||
0a6a717c | 1872 | case READ_6: |
8ea864cf | 1873 | i = common->cmnd[4]; |
144974e7 YL |
1874 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
1875 | reply = check_command_size_in_blocks(common, 6, | |
1876 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1877 | (7<<1) | (1<<4), 1, |
1878 | "READ(6)"); | |
1879 | if (reply == 0) | |
8ea864cf | 1880 | reply = do_read(common); |
d5e2b67a MN |
1881 | break; |
1882 | ||
0a6a717c | 1883 | case READ_10: |
8ea864cf | 1884 | common->data_size_from_cmnd = |
144974e7 YL |
1885 | get_unaligned_be16(&common->cmnd[7]); |
1886 | reply = check_command_size_in_blocks(common, 10, | |
1887 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1888 | (1<<1) | (0xf<<2) | (3<<7), 1, |
1889 | "READ(10)"); | |
1890 | if (reply == 0) | |
8ea864cf | 1891 | reply = do_read(common); |
d5e2b67a MN |
1892 | break; |
1893 | ||
0a6a717c | 1894 | case READ_12: |
8ea864cf | 1895 | common->data_size_from_cmnd = |
144974e7 YL |
1896 | get_unaligned_be32(&common->cmnd[6]); |
1897 | reply = check_command_size_in_blocks(common, 12, | |
1898 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1899 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
1900 | "READ(12)"); | |
1901 | if (reply == 0) | |
8ea864cf | 1902 | reply = do_read(common); |
d5e2b67a MN |
1903 | break; |
1904 | ||
0a6a717c | 1905 | case READ_CAPACITY: |
8ea864cf MN |
1906 | common->data_size_from_cmnd = 8; |
1907 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1908 | (0xf<<2) | (1<<8), 1, |
1909 | "READ CAPACITY"); | |
1910 | if (reply == 0) | |
8ea864cf | 1911 | reply = do_read_capacity(common, bh); |
d5e2b67a MN |
1912 | break; |
1913 | ||
0a6a717c | 1914 | case READ_HEADER: |
8ea864cf | 1915 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1916 | goto unknown_cmnd; |
8ea864cf MN |
1917 | common->data_size_from_cmnd = |
1918 | get_unaligned_be16(&common->cmnd[7]); | |
1919 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1920 | (3<<7) | (0x1f<<1), 1, |
1921 | "READ HEADER"); | |
1922 | if (reply == 0) | |
8ea864cf | 1923 | reply = do_read_header(common, bh); |
d5e2b67a MN |
1924 | break; |
1925 | ||
0a6a717c | 1926 | case READ_TOC: |
8ea864cf | 1927 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1928 | goto unknown_cmnd; |
8ea864cf MN |
1929 | common->data_size_from_cmnd = |
1930 | get_unaligned_be16(&common->cmnd[7]); | |
1931 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1932 | (7<<6) | (1<<1), 1, |
1933 | "READ TOC"); | |
1934 | if (reply == 0) | |
8ea864cf | 1935 | reply = do_read_toc(common, bh); |
d5e2b67a MN |
1936 | break; |
1937 | ||
0a6a717c | 1938 | case READ_FORMAT_CAPACITIES: |
8ea864cf MN |
1939 | common->data_size_from_cmnd = |
1940 | get_unaligned_be16(&common->cmnd[7]); | |
1941 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1942 | (3<<7), 1, |
1943 | "READ FORMAT CAPACITIES"); | |
1944 | if (reply == 0) | |
8ea864cf | 1945 | reply = do_read_format_capacities(common, bh); |
d5e2b67a MN |
1946 | break; |
1947 | ||
0a6a717c | 1948 | case REQUEST_SENSE: |
8ea864cf MN |
1949 | common->data_size_from_cmnd = common->cmnd[4]; |
1950 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1951 | (1<<4), 0, |
1952 | "REQUEST SENSE"); | |
1953 | if (reply == 0) | |
8ea864cf | 1954 | reply = do_request_sense(common, bh); |
d5e2b67a MN |
1955 | break; |
1956 | ||
0a6a717c | 1957 | case START_STOP: |
8ea864cf MN |
1958 | common->data_size_from_cmnd = 0; |
1959 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1960 | (1<<1) | (1<<4), 0, |
1961 | "START-STOP UNIT"); | |
1962 | if (reply == 0) | |
8ea864cf | 1963 | reply = do_start_stop(common); |
d5e2b67a MN |
1964 | break; |
1965 | ||
0a6a717c | 1966 | case SYNCHRONIZE_CACHE: |
8ea864cf MN |
1967 | common->data_size_from_cmnd = 0; |
1968 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
1969 | (0xf<<2) | (3<<7), 1, |
1970 | "SYNCHRONIZE CACHE"); | |
1971 | if (reply == 0) | |
8ea864cf | 1972 | reply = do_synchronize_cache(common); |
d5e2b67a MN |
1973 | break; |
1974 | ||
0a6a717c | 1975 | case TEST_UNIT_READY: |
8ea864cf MN |
1976 | common->data_size_from_cmnd = 0; |
1977 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d5e2b67a MN |
1978 | 0, 1, |
1979 | "TEST UNIT READY"); | |
1980 | break; | |
1981 | ||
b73af61e MN |
1982 | /* |
1983 | * Although optional, this command is used by MS-Windows. We | |
1984 | * support a minimal version: BytChk must be 0. | |
1985 | */ | |
0a6a717c | 1986 | case VERIFY: |
8ea864cf MN |
1987 | common->data_size_from_cmnd = 0; |
1988 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
1989 | (1<<1) | (0xf<<2) | (3<<7), 1, |
1990 | "VERIFY"); | |
1991 | if (reply == 0) | |
8ea864cf | 1992 | reply = do_verify(common); |
d5e2b67a MN |
1993 | break; |
1994 | ||
0a6a717c | 1995 | case WRITE_6: |
8ea864cf | 1996 | i = common->cmnd[4]; |
144974e7 YL |
1997 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
1998 | reply = check_command_size_in_blocks(common, 6, | |
1999 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2000 | (7<<1) | (1<<4), 1, |
2001 | "WRITE(6)"); | |
2002 | if (reply == 0) | |
8ea864cf | 2003 | reply = do_write(common); |
d5e2b67a MN |
2004 | break; |
2005 | ||
0a6a717c | 2006 | case WRITE_10: |
8ea864cf | 2007 | common->data_size_from_cmnd = |
144974e7 YL |
2008 | get_unaligned_be16(&common->cmnd[7]); |
2009 | reply = check_command_size_in_blocks(common, 10, | |
2010 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2011 | (1<<1) | (0xf<<2) | (3<<7), 1, |
2012 | "WRITE(10)"); | |
2013 | if (reply == 0) | |
8ea864cf | 2014 | reply = do_write(common); |
d5e2b67a MN |
2015 | break; |
2016 | ||
0a6a717c | 2017 | case WRITE_12: |
8ea864cf | 2018 | common->data_size_from_cmnd = |
144974e7 YL |
2019 | get_unaligned_be32(&common->cmnd[6]); |
2020 | reply = check_command_size_in_blocks(common, 12, | |
2021 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2022 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
2023 | "WRITE(12)"); | |
2024 | if (reply == 0) | |
8ea864cf | 2025 | reply = do_write(common); |
d5e2b67a MN |
2026 | break; |
2027 | ||
b73af61e MN |
2028 | /* |
2029 | * Some mandatory commands that we recognize but don't implement. | |
d5e2b67a MN |
2030 | * They don't mean much in this setting. It's left as an exercise |
2031 | * for anyone interested to implement RESERVE and RELEASE in terms | |
b73af61e MN |
2032 | * of Posix locks. |
2033 | */ | |
0a6a717c MN |
2034 | case FORMAT_UNIT: |
2035 | case RELEASE: | |
2036 | case RESERVE: | |
2037 | case SEND_DIAGNOSTIC: | |
d26a6aa0 | 2038 | /* Fall through */ |
d5e2b67a MN |
2039 | |
2040 | default: | |
d26a6aa0 | 2041 | unknown_cmnd: |
8ea864cf MN |
2042 | common->data_size_from_cmnd = 0; |
2043 | sprintf(unknown, "Unknown x%02x", common->cmnd[0]); | |
2044 | reply = check_command(common, common->cmnd_size, | |
c85dcdac | 2045 | DATA_DIR_UNKNOWN, ~0, 0, unknown); |
d26a6aa0 | 2046 | if (reply == 0) { |
8ea864cf | 2047 | common->curlun->sense_data = SS_INVALID_COMMAND; |
d5e2b67a MN |
2048 | reply = -EINVAL; |
2049 | } | |
2050 | break; | |
2051 | } | |
8ea864cf | 2052 | up_read(&common->filesem); |
d5e2b67a MN |
2053 | |
2054 | if (reply == -EINTR || signal_pending(current)) | |
2055 | return -EINTR; | |
2056 | ||
2057 | /* Set up the single reply buffer for finish_reply() */ | |
2058 | if (reply == -EINVAL) | |
d26a6aa0 | 2059 | reply = 0; /* Error reply length */ |
8ea864cf | 2060 | if (reply >= 0 && common->data_dir == DATA_DIR_TO_HOST) { |
b73af61e | 2061 | reply = min((u32)reply, common->data_size_from_cmnd); |
d5e2b67a MN |
2062 | bh->inreq->length = reply; |
2063 | bh->state = BUF_STATE_FULL; | |
8ea864cf | 2064 | common->residue -= reply; |
d26a6aa0 | 2065 | } /* Otherwise it's already set */ |
d5e2b67a MN |
2066 | |
2067 | return 0; | |
2068 | } | |
2069 | ||
2070 | ||
2071 | /*-------------------------------------------------------------------------*/ | |
2072 | ||
2073 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2074 | { | |
8ea864cf | 2075 | struct usb_request *req = bh->outreq; |
7ac4704c | 2076 | struct bulk_cb_wrap *cbw = req->buf; |
8ea864cf | 2077 | struct fsg_common *common = fsg->common; |
d5e2b67a MN |
2078 | |
2079 | /* Was this a real packet? Should it be ignored? */ | |
2080 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) | |
2081 | return -EINVAL; | |
2082 | ||
2083 | /* Is the CBW valid? */ | |
775dafdc | 2084 | if (req->actual != US_BULK_CB_WRAP_LEN || |
d5e2b67a | 2085 | cbw->Signature != cpu_to_le32( |
775dafdc | 2086 | US_BULK_CB_SIGN)) { |
d5e2b67a MN |
2087 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", |
2088 | req->actual, | |
2089 | le32_to_cpu(cbw->Signature)); | |
2090 | ||
b73af61e MN |
2091 | /* |
2092 | * The Bulk-only spec says we MUST stall the IN endpoint | |
d5e2b67a MN |
2093 | * (6.6.1), so it's unavoidable. It also says we must |
2094 | * retain this state until the next reset, but there's | |
2095 | * no way to tell the controller driver it should ignore | |
2096 | * Clear-Feature(HALT) requests. | |
2097 | * | |
2098 | * We aren't required to halt the OUT endpoint; instead | |
2099 | * we can simply accept and discard any data received | |
b73af61e MN |
2100 | * until the next reset. |
2101 | */ | |
d5e2b67a MN |
2102 | wedge_bulk_in_endpoint(fsg); |
2103 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); | |
2104 | return -EINVAL; | |
2105 | } | |
2106 | ||
2107 | /* Is the CBW meaningful? */ | |
dd02ea5a KO |
2108 | if (cbw->Lun >= ARRAY_SIZE(common->luns) || |
2109 | cbw->Flags & ~US_BULK_FLAG_IN || cbw->Length <= 0 || | |
2110 | cbw->Length > MAX_COMMAND_SIZE) { | |
d5e2b67a MN |
2111 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
2112 | "cmdlen %u\n", | |
2113 | cbw->Lun, cbw->Flags, cbw->Length); | |
2114 | ||
b73af61e MN |
2115 | /* |
2116 | * We can do anything we want here, so let's stall the | |
2117 | * bulk pipes if we are allowed to. | |
2118 | */ | |
8ea864cf | 2119 | if (common->can_stall) { |
d5e2b67a MN |
2120 | fsg_set_halt(fsg, fsg->bulk_out); |
2121 | halt_bulk_in_endpoint(fsg); | |
2122 | } | |
2123 | return -EINVAL; | |
2124 | } | |
2125 | ||
2126 | /* Save the command for later */ | |
8ea864cf MN |
2127 | common->cmnd_size = cbw->Length; |
2128 | memcpy(common->cmnd, cbw->CDB, common->cmnd_size); | |
775dafdc | 2129 | if (cbw->Flags & US_BULK_FLAG_IN) |
8ea864cf | 2130 | common->data_dir = DATA_DIR_TO_HOST; |
d5e2b67a | 2131 | else |
8ea864cf MN |
2132 | common->data_dir = DATA_DIR_FROM_HOST; |
2133 | common->data_size = le32_to_cpu(cbw->DataTransferLength); | |
2134 | if (common->data_size == 0) | |
2135 | common->data_dir = DATA_DIR_NONE; | |
2136 | common->lun = cbw->Lun; | |
dd02ea5a | 2137 | if (common->lun < ARRAY_SIZE(common->luns)) |
8b903fd7 | 2138 | common->curlun = common->luns[common->lun]; |
144974e7 YL |
2139 | else |
2140 | common->curlun = NULL; | |
8ea864cf | 2141 | common->tag = cbw->Tag; |
d5e2b67a MN |
2142 | return 0; |
2143 | } | |
2144 | ||
8ea864cf | 2145 | static int get_next_command(struct fsg_common *common) |
d5e2b67a MN |
2146 | { |
2147 | struct fsg_buffhd *bh; | |
2148 | int rc = 0; | |
2149 | ||
93bcf12e | 2150 | /* Wait for the next buffer to become available */ |
8ea864cf | 2151 | bh = common->next_buffhd_to_fill; |
225785ae AS |
2152 | rc = sleep_thread(common, true, bh); |
2153 | if (rc) | |
2154 | return rc; | |
d5e2b67a | 2155 | |
93bcf12e | 2156 | /* Queue a request to read a Bulk-only CBW */ |
775dafdc | 2157 | set_bulk_out_req_length(common, bh, US_BULK_CB_WRAP_LEN); |
fe52f792 | 2158 | if (!start_out_transfer(common, bh)) |
8ea864cf MN |
2159 | /* Don't know what to do if common->fsg is NULL */ |
2160 | return -EIO; | |
d5e2b67a | 2161 | |
b73af61e MN |
2162 | /* |
2163 | * We will drain the buffer in software, which means we | |
93bcf12e | 2164 | * can reuse it for the next filling. No need to advance |
b73af61e MN |
2165 | * next_buffhd_to_fill. |
2166 | */ | |
d5e2b67a | 2167 | |
93bcf12e | 2168 | /* Wait for the CBW to arrive */ |
225785ae AS |
2169 | rc = sleep_thread(common, true, bh); |
2170 | if (rc) | |
2171 | return rc; | |
2172 | ||
8ea864cf | 2173 | rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO; |
93bcf12e MN |
2174 | bh->state = BUF_STATE_EMPTY; |
2175 | ||
d5e2b67a MN |
2176 | return rc; |
2177 | } | |
2178 | ||
2179 | ||
2180 | /*-------------------------------------------------------------------------*/ | |
2181 | ||
8ea864cf | 2182 | static int alloc_request(struct fsg_common *common, struct usb_ep *ep, |
d5e2b67a MN |
2183 | struct usb_request **preq) |
2184 | { | |
2185 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
2186 | if (*preq) | |
2187 | return 0; | |
8ea864cf | 2188 | ERROR(common, "can't allocate request for %s\n", ep->name); |
d5e2b67a MN |
2189 | return -ENOMEM; |
2190 | } | |
2191 | ||
b894f60a MN |
2192 | /* Reset interface setting and re-init endpoint state (toggle etc). */ |
2193 | static int do_set_interface(struct fsg_common *common, struct fsg_dev *new_fsg) | |
d5e2b67a | 2194 | { |
b894f60a MN |
2195 | struct fsg_dev *fsg; |
2196 | int i, rc = 0; | |
d5e2b67a | 2197 | |
8ea864cf MN |
2198 | if (common->running) |
2199 | DBG(common, "reset interface\n"); | |
d5e2b67a MN |
2200 | |
2201 | reset: | |
2202 | /* Deallocate the requests */ | |
b894f60a MN |
2203 | if (common->fsg) { |
2204 | fsg = common->fsg; | |
8ea864cf | 2205 | |
6fdc5dd2 | 2206 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2207 | struct fsg_buffhd *bh = &common->buffhds[i]; |
d5e2b67a | 2208 | |
8ea864cf MN |
2209 | if (bh->inreq) { |
2210 | usb_ep_free_request(fsg->bulk_in, bh->inreq); | |
2211 | bh->inreq = NULL; | |
2212 | } | |
2213 | if (bh->outreq) { | |
2214 | usb_ep_free_request(fsg->bulk_out, bh->outreq); | |
2215 | bh->outreq = NULL; | |
2216 | } | |
d5e2b67a | 2217 | } |
8ea864cf MN |
2218 | |
2219 | /* Disable the endpoints */ | |
2220 | if (fsg->bulk_in_enabled) { | |
2221 | usb_ep_disable(fsg->bulk_in); | |
2222 | fsg->bulk_in_enabled = 0; | |
2223 | } | |
2224 | if (fsg->bulk_out_enabled) { | |
2225 | usb_ep_disable(fsg->bulk_out); | |
2226 | fsg->bulk_out_enabled = 0; | |
d5e2b67a | 2227 | } |
d5e2b67a | 2228 | |
b894f60a MN |
2229 | common->fsg = NULL; |
2230 | wake_up(&common->fsg_wait); | |
d5e2b67a | 2231 | } |
d5e2b67a | 2232 | |
8ea864cf | 2233 | common->running = 0; |
b894f60a | 2234 | if (!new_fsg || rc) |
d5e2b67a MN |
2235 | return rc; |
2236 | ||
b894f60a MN |
2237 | common->fsg = new_fsg; |
2238 | fsg = common->fsg; | |
d5e2b67a | 2239 | |
b894f60a | 2240 | /* Enable the endpoints */ |
ea2a1df7 TB |
2241 | rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in); |
2242 | if (rc) | |
2243 | goto reset; | |
2244 | rc = usb_ep_enable(fsg->bulk_in); | |
b894f60a MN |
2245 | if (rc) |
2246 | goto reset; | |
ea2a1df7 | 2247 | fsg->bulk_in->driver_data = common; |
b894f60a | 2248 | fsg->bulk_in_enabled = 1; |
8ea864cf | 2249 | |
ea2a1df7 TB |
2250 | rc = config_ep_by_speed(common->gadget, &(fsg->function), |
2251 | fsg->bulk_out); | |
2252 | if (rc) | |
2253 | goto reset; | |
2254 | rc = usb_ep_enable(fsg->bulk_out); | |
b894f60a MN |
2255 | if (rc) |
2256 | goto reset; | |
ea2a1df7 | 2257 | fsg->bulk_out->driver_data = common; |
b894f60a | 2258 | fsg->bulk_out_enabled = 1; |
29cc8897 | 2259 | common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc); |
b894f60a MN |
2260 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
2261 | ||
2262 | /* Allocate the requests */ | |
6fdc5dd2 | 2263 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
b894f60a MN |
2264 | struct fsg_buffhd *bh = &common->buffhds[i]; |
2265 | ||
2266 | rc = alloc_request(common, fsg->bulk_in, &bh->inreq); | |
8ea864cf | 2267 | if (rc) |
d5e2b67a | 2268 | goto reset; |
b894f60a | 2269 | rc = alloc_request(common, fsg->bulk_out, &bh->outreq); |
8ea864cf | 2270 | if (rc) |
d5e2b67a | 2271 | goto reset; |
b894f60a MN |
2272 | bh->inreq->buf = bh->outreq->buf = bh->buf; |
2273 | bh->inreq->context = bh->outreq->context = bh; | |
2274 | bh->inreq->complete = bulk_in_complete; | |
2275 | bh->outreq->complete = bulk_out_complete; | |
8ea864cf | 2276 | } |
d5e2b67a | 2277 | |
b894f60a | 2278 | common->running = 1; |
dd02ea5a | 2279 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) |
8b903fd7 AP |
2280 | if (common->luns[i]) |
2281 | common->luns[i]->unit_attention_data = | |
2282 | SS_RESET_OCCURRED; | |
d5e2b67a MN |
2283 | return rc; |
2284 | } | |
2285 | ||
2286 | ||
d23b0f08 MN |
2287 | /****************************** ALT CONFIGS ******************************/ |
2288 | ||
d23b0f08 MN |
2289 | static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
2290 | { | |
2291 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2292 | fsg->common->new_fsg = fsg; |
8ea864cf | 2293 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
95ed3236 | 2294 | return USB_GADGET_DELAYED_STATUS; |
d23b0f08 MN |
2295 | } |
2296 | ||
2297 | static void fsg_disable(struct usb_function *f) | |
2298 | { | |
2299 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2300 | fsg->common->new_fsg = NULL; |
8ea864cf | 2301 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
d23b0f08 MN |
2302 | } |
2303 | ||
2304 | ||
d5e2b67a MN |
2305 | /*-------------------------------------------------------------------------*/ |
2306 | ||
8ea864cf | 2307 | static void handle_exception(struct fsg_common *common) |
d5e2b67a | 2308 | { |
d5e2b67a | 2309 | int i; |
d5e2b67a MN |
2310 | struct fsg_buffhd *bh; |
2311 | enum fsg_state old_state; | |
d5e2b67a MN |
2312 | struct fsg_lun *curlun; |
2313 | unsigned int exception_req_tag; | |
d5e2b67a | 2314 | |
b73af61e MN |
2315 | /* |
2316 | * Clear the existing signals. Anything but SIGUSR1 is converted | |
2317 | * into a high-priority EXIT exception. | |
2318 | */ | |
d5e2b67a | 2319 | for (;;) { |
be0e6f29 | 2320 | int sig = kernel_dequeue_signal(NULL); |
d5e2b67a MN |
2321 | if (!sig) |
2322 | break; | |
2323 | if (sig != SIGUSR1) { | |
78db441d | 2324 | spin_lock_irq(&common->lock); |
8ea864cf MN |
2325 | if (common->state < FSG_STATE_EXIT) |
2326 | DBG(common, "Main thread exiting on signal\n"); | |
78db441d AS |
2327 | common->state = FSG_STATE_EXIT; |
2328 | spin_unlock_irq(&common->lock); | |
d5e2b67a MN |
2329 | } |
2330 | } | |
2331 | ||
2332 | /* Cancel all the pending transfers */ | |
b894f60a | 2333 | if (likely(common->fsg)) { |
6fdc5dd2 | 2334 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2335 | bh = &common->buffhds[i]; |
225785ae | 2336 | if (bh->state == BUF_STATE_SENDING) |
8ea864cf | 2337 | usb_ep_dequeue(common->fsg->bulk_in, bh->inreq); |
225785ae | 2338 | if (bh->state == BUF_STATE_RECEIVING) |
8ea864cf MN |
2339 | usb_ep_dequeue(common->fsg->bulk_out, |
2340 | bh->outreq); | |
d5e2b67a | 2341 | |
225785ae AS |
2342 | /* Wait for a transfer to become idle */ |
2343 | if (sleep_thread(common, false, bh)) | |
8ea864cf MN |
2344 | return; |
2345 | } | |
2346 | ||
2347 | /* Clear out the controller's fifos */ | |
2348 | if (common->fsg->bulk_in_enabled) | |
2349 | usb_ep_fifo_flush(common->fsg->bulk_in); | |
2350 | if (common->fsg->bulk_out_enabled) | |
2351 | usb_ep_fifo_flush(common->fsg->bulk_out); | |
2352 | } | |
d5e2b67a | 2353 | |
b73af61e MN |
2354 | /* |
2355 | * Reset the I/O buffer states and pointers, the SCSI | |
2356 | * state, and the exception. Then invoke the handler. | |
2357 | */ | |
8ea864cf | 2358 | spin_lock_irq(&common->lock); |
d5e2b67a | 2359 | |
6fdc5dd2 | 2360 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2361 | bh = &common->buffhds[i]; |
d5e2b67a MN |
2362 | bh->state = BUF_STATE_EMPTY; |
2363 | } | |
8ea864cf MN |
2364 | common->next_buffhd_to_fill = &common->buffhds[0]; |
2365 | common->next_buffhd_to_drain = &common->buffhds[0]; | |
2366 | exception_req_tag = common->exception_req_tag; | |
8ea864cf | 2367 | old_state = common->state; |
78db441d | 2368 | common->state = FSG_STATE_NORMAL; |
d5e2b67a | 2369 | |
78db441d | 2370 | if (old_state != FSG_STATE_ABORT_BULK_OUT) { |
dd02ea5a | 2371 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
8b903fd7 AP |
2372 | curlun = common->luns[i]; |
2373 | if (!curlun) | |
2374 | continue; | |
d5e2b67a | 2375 | curlun->prevent_medium_removal = 0; |
d26a6aa0 MN |
2376 | curlun->sense_data = SS_NO_SENSE; |
2377 | curlun->unit_attention_data = SS_NO_SENSE; | |
d5e2b67a MN |
2378 | curlun->sense_data_info = 0; |
2379 | curlun->info_valid = 0; | |
2380 | } | |
d5e2b67a | 2381 | } |
8ea864cf | 2382 | spin_unlock_irq(&common->lock); |
d5e2b67a MN |
2383 | |
2384 | /* Carry out any extra actions required for the exception */ | |
2385 | switch (old_state) { | |
78db441d AS |
2386 | case FSG_STATE_NORMAL: |
2387 | break; | |
2388 | ||
d5e2b67a | 2389 | case FSG_STATE_ABORT_BULK_OUT: |
8ea864cf | 2390 | send_status(common); |
d5e2b67a MN |
2391 | break; |
2392 | ||
78db441d | 2393 | case FSG_STATE_PROTOCOL_RESET: |
b73af61e MN |
2394 | /* |
2395 | * In case we were forced against our will to halt a | |
d5e2b67a | 2396 | * bulk endpoint, clear the halt now. (The SuperH UDC |
b73af61e MN |
2397 | * requires this.) |
2398 | */ | |
8ea864cf MN |
2399 | if (!fsg_is_set(common)) |
2400 | break; | |
2401 | if (test_and_clear_bit(IGNORE_BULK_OUT, | |
2402 | &common->fsg->atomic_bitflags)) | |
2403 | usb_ep_clear_halt(common->fsg->bulk_in); | |
d5e2b67a | 2404 | |
8ea864cf MN |
2405 | if (common->ep0_req_tag == exception_req_tag) |
2406 | ep0_queue(common); /* Complete the status stage */ | |
d5e2b67a | 2407 | |
b73af61e MN |
2408 | /* |
2409 | * Technically this should go here, but it would only be | |
d5e2b67a | 2410 | * a waste of time. Ditto for the INTERFACE_CHANGE and |
b73af61e MN |
2411 | * CONFIG_CHANGE cases. |
2412 | */ | |
dd02ea5a | 2413 | /* for (i = 0; i < common->ARRAY_SIZE(common->luns); ++i) */ |
8b903fd7 AP |
2414 | /* if (common->luns[i]) */ |
2415 | /* common->luns[i]->unit_attention_data = */ | |
2416 | /* SS_RESET_OCCURRED; */ | |
d5e2b67a MN |
2417 | break; |
2418 | ||
d5e2b67a | 2419 | case FSG_STATE_CONFIG_CHANGE: |
b894f60a | 2420 | do_set_interface(common, common->new_fsg); |
95ed3236 RQ |
2421 | if (common->new_fsg) |
2422 | usb_composite_setup_continue(common->cdev); | |
d5e2b67a MN |
2423 | break; |
2424 | ||
d5e2b67a | 2425 | case FSG_STATE_EXIT: |
b894f60a | 2426 | do_set_interface(common, NULL); /* Free resources */ |
8ea864cf MN |
2427 | spin_lock_irq(&common->lock); |
2428 | common->state = FSG_STATE_TERMINATED; /* Stop the thread */ | |
2429 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2430 | break; |
d23b0f08 | 2431 | |
78db441d | 2432 | case FSG_STATE_TERMINATED: |
d23b0f08 | 2433 | break; |
d5e2b67a MN |
2434 | } |
2435 | } | |
2436 | ||
2437 | ||
2438 | /*-------------------------------------------------------------------------*/ | |
2439 | ||
8ea864cf | 2440 | static int fsg_main_thread(void *common_) |
d5e2b67a | 2441 | { |
8ea864cf | 2442 | struct fsg_common *common = common_; |
d5e2b67a | 2443 | |
b73af61e MN |
2444 | /* |
2445 | * Allow the thread to be killed by a signal, but set the signal mask | |
2446 | * to block everything but INT, TERM, KILL, and USR1. | |
2447 | */ | |
d5e2b67a MN |
2448 | allow_signal(SIGINT); |
2449 | allow_signal(SIGTERM); | |
2450 | allow_signal(SIGKILL); | |
2451 | allow_signal(SIGUSR1); | |
2452 | ||
2453 | /* Allow the thread to be frozen */ | |
2454 | set_freezable(); | |
2455 | ||
b73af61e MN |
2456 | /* |
2457 | * Arrange for userspace references to be interpreted as kernel | |
d5e2b67a | 2458 | * pointers. That way we can pass a kernel pointer to a routine |
b73af61e MN |
2459 | * that expects a __user pointer and it will work okay. |
2460 | */ | |
d5e2b67a MN |
2461 | set_fs(get_ds()); |
2462 | ||
2463 | /* The main loop */ | |
8ea864cf MN |
2464 | while (common->state != FSG_STATE_TERMINATED) { |
2465 | if (exception_in_progress(common) || signal_pending(current)) { | |
2466 | handle_exception(common); | |
d5e2b67a MN |
2467 | continue; |
2468 | } | |
2469 | ||
8ea864cf | 2470 | if (!common->running) { |
225785ae | 2471 | sleep_thread(common, true, NULL); |
d5e2b67a MN |
2472 | continue; |
2473 | } | |
2474 | ||
78db441d | 2475 | if (get_next_command(common) || exception_in_progress(common)) |
d5e2b67a | 2476 | continue; |
78db441d | 2477 | if (do_scsi_command(common) || exception_in_progress(common)) |
d5e2b67a | 2478 | continue; |
78db441d | 2479 | if (finish_reply(common) || exception_in_progress(common)) |
d5e2b67a | 2480 | continue; |
78db441d | 2481 | send_status(common); |
d23b0f08 | 2482 | } |
d5e2b67a | 2483 | |
8ea864cf MN |
2484 | spin_lock_irq(&common->lock); |
2485 | common->thread_task = NULL; | |
2486 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2487 | |
8876f5e7 MN |
2488 | if (!common->ops || !common->ops->thread_exits |
2489 | || common->ops->thread_exits(common) < 0) { | |
dd02ea5a | 2490 | int i; |
7f1ee826 MN |
2491 | |
2492 | down_write(&common->filesem); | |
bee91869 | 2493 | for (i = 0; i < ARRAY_SIZE(common->luns); i++) { |
dd02ea5a | 2494 | struct fsg_lun *curlun = common->luns[i]; |
8b903fd7 | 2495 | if (!curlun || !fsg_lun_is_open(curlun)) |
7f1ee826 MN |
2496 | continue; |
2497 | ||
2498 | fsg_lun_close(curlun); | |
2499 | curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; | |
2500 | } | |
2501 | up_write(&common->filesem); | |
2502 | } | |
d5e2b67a | 2503 | |
00cb636e | 2504 | /* Let fsg_unbind() know the thread has exited */ |
8ea864cf | 2505 | complete_and_exit(&common->thread_notifier, 0); |
d5e2b67a MN |
2506 | } |
2507 | ||
2508 | ||
9c610213 | 2509 | /*************************** DEVICE ATTRIBUTES ***************************/ |
d5e2b67a | 2510 | |
6fdc5dd2 AP |
2511 | static ssize_t ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
2512 | { | |
77850ae2 AP |
2513 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2514 | ||
2515 | return fsg_show_ro(curlun, buf); | |
6fdc5dd2 AP |
2516 | } |
2517 | ||
2518 | static ssize_t nofua_show(struct device *dev, struct device_attribute *attr, | |
2519 | char *buf) | |
2520 | { | |
77850ae2 AP |
2521 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2522 | ||
2523 | return fsg_show_nofua(curlun, buf); | |
6fdc5dd2 AP |
2524 | } |
2525 | ||
2526 | static ssize_t file_show(struct device *dev, struct device_attribute *attr, | |
2527 | char *buf) | |
2528 | { | |
77850ae2 AP |
2529 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2530 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2531 | ||
2532 | return fsg_show_file(curlun, filesem, buf); | |
6fdc5dd2 AP |
2533 | } |
2534 | ||
2535 | static ssize_t ro_store(struct device *dev, struct device_attribute *attr, | |
2536 | const char *buf, size_t count) | |
2537 | { | |
77850ae2 AP |
2538 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2539 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2540 | ||
2541 | return fsg_store_ro(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2542 | } |
2543 | ||
2544 | static ssize_t nofua_store(struct device *dev, struct device_attribute *attr, | |
2545 | const char *buf, size_t count) | |
2546 | { | |
77850ae2 AP |
2547 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2548 | ||
2549 | return fsg_store_nofua(curlun, buf, count); | |
6fdc5dd2 AP |
2550 | } |
2551 | ||
2552 | static ssize_t file_store(struct device *dev, struct device_attribute *attr, | |
2553 | const char *buf, size_t count) | |
2554 | { | |
77850ae2 AP |
2555 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2556 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2557 | ||
2558 | return fsg_store_file(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2559 | } |
2560 | ||
ce26bd23 | 2561 | static DEVICE_ATTR_RW(nofua); |
c7b364f7 TI |
2562 | /* mode wil be set in fsg_lun_attr_is_visible() */ |
2563 | static DEVICE_ATTR(ro, 0, ro_show, ro_store); | |
2564 | static DEVICE_ATTR(file, 0, file_show, file_store); | |
d5e2b67a | 2565 | |
9c610213 MN |
2566 | /****************************** FSG COMMON ******************************/ |
2567 | ||
2568 | static void fsg_common_release(struct kref *ref); | |
d5e2b67a | 2569 | |
9c610213 | 2570 | static void fsg_lun_release(struct device *dev) |
d5e2b67a | 2571 | { |
9c610213 | 2572 | /* Nothing needs to be done */ |
d5e2b67a MN |
2573 | } |
2574 | ||
f3fed367 | 2575 | void fsg_common_get(struct fsg_common *common) |
d5e2b67a | 2576 | { |
9c610213 | 2577 | kref_get(&common->ref); |
d5e2b67a | 2578 | } |
7a93d040 | 2579 | EXPORT_SYMBOL_GPL(fsg_common_get); |
d5e2b67a | 2580 | |
f3fed367 | 2581 | void fsg_common_put(struct fsg_common *common) |
9c610213 MN |
2582 | { |
2583 | kref_put(&common->ref, fsg_common_release); | |
2584 | } | |
7a93d040 | 2585 | EXPORT_SYMBOL_GPL(fsg_common_put); |
9c610213 | 2586 | |
7a93d040 | 2587 | static struct fsg_common *fsg_common_setup(struct fsg_common *common) |
b24650df AP |
2588 | { |
2589 | if (!common) { | |
2590 | common = kzalloc(sizeof(*common), GFP_KERNEL); | |
2591 | if (!common) | |
2592 | return ERR_PTR(-ENOMEM); | |
2593 | common->free_storage_on_release = 1; | |
2594 | } else { | |
b24650df AP |
2595 | common->free_storage_on_release = 0; |
2596 | } | |
2597 | init_rwsem(&common->filesem); | |
2598 | spin_lock_init(&common->lock); | |
2599 | kref_init(&common->ref); | |
2600 | init_completion(&common->thread_notifier); | |
225785ae | 2601 | init_waitqueue_head(&common->io_wait); |
b24650df AP |
2602 | init_waitqueue_head(&common->fsg_wait); |
2603 | common->state = FSG_STATE_TERMINATED; | |
dd02ea5a | 2604 | memset(common->luns, 0, sizeof(common->luns)); |
b24650df AP |
2605 | |
2606 | return common; | |
2607 | } | |
2608 | ||
bd528d4e AP |
2609 | void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs) |
2610 | { | |
2611 | common->sysfs = sysfs; | |
2612 | } | |
7a93d040 | 2613 | EXPORT_SYMBOL_GPL(fsg_common_set_sysfs); |
bd528d4e | 2614 | |
8502d66d AP |
2615 | static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n) |
2616 | { | |
2617 | if (buffhds) { | |
2618 | struct fsg_buffhd *bh = buffhds; | |
2619 | while (n--) { | |
2620 | kfree(bh->buf); | |
2621 | ++bh; | |
2622 | } | |
2623 | kfree(buffhds); | |
2624 | } | |
2625 | } | |
2626 | ||
6313caac AP |
2627 | int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n) |
2628 | { | |
2629 | struct fsg_buffhd *bh, *buffhds; | |
fe5a6c48 | 2630 | int i; |
6313caac AP |
2631 | |
2632 | buffhds = kcalloc(n, sizeof(*buffhds), GFP_KERNEL); | |
2633 | if (!buffhds) | |
2634 | return -ENOMEM; | |
2635 | ||
2636 | /* Data buffers cyclic list */ | |
2637 | bh = buffhds; | |
2638 | i = n; | |
2639 | goto buffhds_first_it; | |
2640 | do { | |
2641 | bh->next = bh + 1; | |
2642 | ++bh; | |
2643 | buffhds_first_it: | |
2644 | bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL); | |
2645 | if (unlikely(!bh->buf)) | |
2646 | goto error_release; | |
2647 | } while (--i); | |
2648 | bh->next = buffhds; | |
2649 | ||
2650 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2651 | common->fsg_num_buffers = n; | |
2652 | common->buffhds = buffhds; | |
2653 | ||
2654 | return 0; | |
2655 | ||
2656 | error_release: | |
2657 | /* | |
2658 | * "buf"s pointed to by heads after n - i are NULL | |
2659 | * so releasing them won't hurt | |
2660 | */ | |
2661 | _fsg_common_free_buffers(buffhds, n); | |
2662 | ||
2663 | return -ENOMEM; | |
2664 | } | |
7a93d040 | 2665 | EXPORT_SYMBOL_GPL(fsg_common_set_num_buffers); |
6313caac | 2666 | |
5542f58c | 2667 | void fsg_common_remove_lun(struct fsg_lun *lun) |
70634170 | 2668 | { |
5542f58c | 2669 | if (device_is_registered(&lun->dev)) |
70634170 | 2670 | device_unregister(&lun->dev); |
70634170 AP |
2671 | fsg_lun_close(lun); |
2672 | kfree(lun); | |
2673 | } | |
7a93d040 | 2674 | EXPORT_SYMBOL_GPL(fsg_common_remove_lun); |
70634170 AP |
2675 | |
2676 | static void _fsg_common_remove_luns(struct fsg_common *common, int n) | |
2677 | { | |
2678 | int i; | |
2679 | ||
2680 | for (i = 0; i < n; ++i) | |
2681 | if (common->luns[i]) { | |
5542f58c | 2682 | fsg_common_remove_lun(common->luns[i]); |
70634170 AP |
2683 | common->luns[i] = NULL; |
2684 | } | |
2685 | } | |
2686 | ||
2687 | void fsg_common_remove_luns(struct fsg_common *common) | |
2688 | { | |
dd02ea5a | 2689 | _fsg_common_remove_luns(common, ARRAY_SIZE(common->luns)); |
70634170 | 2690 | } |
bab7a1f1 | 2691 | EXPORT_SYMBOL_GPL(fsg_common_remove_luns); |
70634170 | 2692 | |
2412fbf1 AP |
2693 | void fsg_common_set_ops(struct fsg_common *common, |
2694 | const struct fsg_operations *ops) | |
2695 | { | |
2696 | common->ops = ops; | |
2697 | } | |
7a93d040 | 2698 | EXPORT_SYMBOL_GPL(fsg_common_set_ops); |
2412fbf1 | 2699 | |
e5eaa0dc AP |
2700 | void fsg_common_free_buffers(struct fsg_common *common) |
2701 | { | |
2702 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2703 | common->buffhds = NULL; | |
2704 | } | |
7a93d040 | 2705 | EXPORT_SYMBOL_GPL(fsg_common_free_buffers); |
70634170 | 2706 | |
a891d7a3 AP |
2707 | int fsg_common_set_cdev(struct fsg_common *common, |
2708 | struct usb_composite_dev *cdev, bool can_stall) | |
2709 | { | |
2710 | struct usb_string *us; | |
2711 | ||
2712 | common->gadget = cdev->gadget; | |
2713 | common->ep0 = cdev->gadget->ep0; | |
2714 | common->ep0req = cdev->req; | |
2715 | common->cdev = cdev; | |
2716 | ||
2717 | us = usb_gstrings_attach(cdev, fsg_strings_array, | |
2718 | ARRAY_SIZE(fsg_strings)); | |
2719 | if (IS_ERR(us)) | |
2720 | return PTR_ERR(us); | |
2721 | ||
2722 | fsg_intf_desc.iInterface = us[FSG_STRING_INTERFACE].id; | |
2723 | ||
2724 | /* | |
2725 | * Some peripheral controllers are known not to be able to | |
2726 | * halt bulk endpoints correctly. If one of them is present, | |
2727 | * disable stalls. | |
2728 | */ | |
a4cc4215 RB |
2729 | common->can_stall = can_stall && |
2730 | gadget_is_stall_supported(common->gadget); | |
a891d7a3 AP |
2731 | |
2732 | return 0; | |
2733 | } | |
7a93d040 | 2734 | EXPORT_SYMBOL_GPL(fsg_common_set_cdev); |
a891d7a3 | 2735 | |
c7b364f7 TI |
2736 | static struct attribute *fsg_lun_dev_attrs[] = { |
2737 | &dev_attr_ro.attr, | |
2738 | &dev_attr_file.attr, | |
2739 | &dev_attr_nofua.attr, | |
2740 | NULL | |
2741 | }; | |
b27c08c9 | 2742 | |
c7b364f7 TI |
2743 | static umode_t fsg_lun_dev_is_visible(struct kobject *kobj, |
2744 | struct attribute *attr, int idx) | |
2745 | { | |
2746 | struct device *dev = kobj_to_dev(kobj); | |
2747 | struct fsg_lun *lun = fsg_lun_from_dev(dev); | |
b27c08c9 | 2748 | |
c7b364f7 TI |
2749 | if (attr == &dev_attr_ro.attr) |
2750 | return lun->cdrom ? S_IRUGO : (S_IWUSR | S_IRUGO); | |
2751 | if (attr == &dev_attr_file.attr) | |
2752 | return lun->removable ? (S_IWUSR | S_IRUGO) : S_IRUGO; | |
2753 | return attr->mode; | |
2754 | } | |
b27c08c9 | 2755 | |
c7b364f7 TI |
2756 | static const struct attribute_group fsg_lun_dev_group = { |
2757 | .attrs = fsg_lun_dev_attrs, | |
2758 | .is_visible = fsg_lun_dev_is_visible, | |
2759 | }; | |
b27c08c9 | 2760 | |
c7b364f7 TI |
2761 | static const struct attribute_group *fsg_lun_dev_groups[] = { |
2762 | &fsg_lun_dev_group, | |
2763 | NULL | |
2764 | }; | |
b27c08c9 AP |
2765 | |
2766 | int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg, | |
2767 | unsigned int id, const char *name, | |
2768 | const char **name_pfx) | |
2769 | { | |
2770 | struct fsg_lun *lun; | |
2771 | char *pathbuf, *p; | |
2772 | int rc = -ENOMEM; | |
2773 | ||
dd02ea5a | 2774 | if (id >= ARRAY_SIZE(common->luns)) |
b27c08c9 AP |
2775 | return -ENODEV; |
2776 | ||
2777 | if (common->luns[id]) | |
2778 | return -EBUSY; | |
2779 | ||
2780 | if (!cfg->filename && !cfg->removable) { | |
2781 | pr_err("no file given for LUN%d\n", id); | |
2782 | return -EINVAL; | |
2783 | } | |
2784 | ||
2785 | lun = kzalloc(sizeof(*lun), GFP_KERNEL); | |
2786 | if (!lun) | |
2787 | return -ENOMEM; | |
2788 | ||
2789 | lun->name_pfx = name_pfx; | |
2790 | ||
2791 | lun->cdrom = !!cfg->cdrom; | |
2792 | lun->ro = cfg->cdrom || cfg->ro; | |
2793 | lun->initially_ro = lun->ro; | |
2794 | lun->removable = !!cfg->removable; | |
2795 | ||
2796 | if (!common->sysfs) { | |
2797 | /* we DON'T own the name!*/ | |
2798 | lun->name = name; | |
2799 | } else { | |
2800 | lun->dev.release = fsg_lun_release; | |
2801 | lun->dev.parent = &common->gadget->dev; | |
c7b364f7 | 2802 | lun->dev.groups = fsg_lun_dev_groups; |
b27c08c9 | 2803 | dev_set_drvdata(&lun->dev, &common->filesem); |
a1924d8a | 2804 | dev_set_name(&lun->dev, "%s", name); |
b27c08c9 AP |
2805 | lun->name = dev_name(&lun->dev); |
2806 | ||
c7b364f7 | 2807 | rc = device_register(&lun->dev); |
b27c08c9 AP |
2808 | if (rc) { |
2809 | pr_info("failed to register LUN%d: %d\n", id, rc); | |
c7b364f7 | 2810 | put_device(&lun->dev); |
b27c08c9 AP |
2811 | goto error_sysfs; |
2812 | } | |
2813 | } | |
2814 | ||
2815 | common->luns[id] = lun; | |
2816 | ||
2817 | if (cfg->filename) { | |
2818 | rc = fsg_lun_open(lun, cfg->filename); | |
2819 | if (rc) | |
2820 | goto error_lun; | |
2821 | } | |
2822 | ||
2823 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); | |
2824 | p = "(no medium)"; | |
2825 | if (fsg_lun_is_open(lun)) { | |
2826 | p = "(error)"; | |
2827 | if (pathbuf) { | |
9bf39ab2 | 2828 | p = file_path(lun->filp, pathbuf, PATH_MAX); |
b27c08c9 AP |
2829 | if (IS_ERR(p)) |
2830 | p = "(error)"; | |
2831 | } | |
2832 | } | |
2833 | pr_info("LUN: %s%s%sfile: %s\n", | |
2834 | lun->removable ? "removable " : "", | |
2835 | lun->ro ? "read only " : "", | |
2836 | lun->cdrom ? "CD-ROM " : "", | |
2837 | p); | |
2838 | kfree(pathbuf); | |
2839 | ||
2840 | return 0; | |
2841 | ||
2842 | error_lun: | |
5542f58c | 2843 | if (device_is_registered(&lun->dev)) |
b27c08c9 | 2844 | device_unregister(&lun->dev); |
b27c08c9 AP |
2845 | fsg_lun_close(lun); |
2846 | common->luns[id] = NULL; | |
2847 | error_sysfs: | |
2848 | kfree(lun); | |
2849 | return rc; | |
2850 | } | |
7a93d040 | 2851 | EXPORT_SYMBOL_GPL(fsg_common_create_lun); |
b27c08c9 AP |
2852 | |
2853 | int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg) | |
2854 | { | |
2855 | char buf[8]; /* enough for 100000000 different numbers, decimal */ | |
2856 | int i, rc; | |
2857 | ||
dd02ea5a KO |
2858 | fsg_common_remove_luns(common); |
2859 | ||
2860 | for (i = 0; i < cfg->nluns; ++i) { | |
b27c08c9 AP |
2861 | snprintf(buf, sizeof(buf), "lun%d", i); |
2862 | rc = fsg_common_create_lun(common, &cfg->luns[i], i, buf, NULL); | |
2863 | if (rc) | |
2864 | goto fail; | |
2865 | } | |
2866 | ||
dd02ea5a | 2867 | pr_info("Number of LUNs=%d\n", cfg->nluns); |
b27c08c9 AP |
2868 | |
2869 | return 0; | |
2870 | ||
2871 | fail: | |
2872 | _fsg_common_remove_luns(common, i); | |
2873 | return rc; | |
2874 | } | |
7a93d040 | 2875 | EXPORT_SYMBOL_GPL(fsg_common_create_luns); |
b27c08c9 | 2876 | |
23682e3c AP |
2877 | void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn, |
2878 | const char *pn) | |
2879 | { | |
2880 | int i; | |
2881 | ||
2882 | /* Prepare inquiryString */ | |
2883 | i = get_default_bcdDevice(); | |
2884 | snprintf(common->inquiry_string, sizeof(common->inquiry_string), | |
2885 | "%-8s%-16s%04x", vn ?: "Linux", | |
2886 | /* Assume product name dependent on the first LUN */ | |
2887 | pn ?: ((*common->luns)->cdrom | |
2888 | ? "File-CD Gadget" | |
2889 | : "File-Stor Gadget"), | |
2890 | i); | |
2891 | } | |
7a93d040 | 2892 | EXPORT_SYMBOL_GPL(fsg_common_set_inquiry_string); |
23682e3c | 2893 | |
9c610213 MN |
2894 | static void fsg_common_release(struct kref *ref) |
2895 | { | |
b9e00088 | 2896 | struct fsg_common *common = container_of(ref, struct fsg_common, ref); |
dd02ea5a | 2897 | int i; |
9c610213 | 2898 | |
8ea864cf MN |
2899 | /* If the thread isn't already dead, tell it to exit now */ |
2900 | if (common->state != FSG_STATE_TERMINATED) { | |
2901 | raise_exception(common, FSG_STATE_EXIT); | |
2902 | wait_for_completion(&common->thread_notifier); | |
8ea864cf MN |
2903 | } |
2904 | ||
dd02ea5a KO |
2905 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
2906 | struct fsg_lun *lun = common->luns[i]; | |
2907 | if (!lun) | |
2908 | continue; | |
2909 | fsg_lun_close(lun); | |
5542f58c | 2910 | if (device_is_registered(&lun->dev)) |
dd02ea5a KO |
2911 | device_unregister(&lun->dev); |
2912 | kfree(lun); | |
9c610213 MN |
2913 | } |
2914 | ||
8502d66d | 2915 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); |
9c610213 MN |
2916 | if (common->free_storage_on_release) |
2917 | kfree(common); | |
2918 | } | |
2919 | ||
2920 | ||
2921 | /*-------------------------------------------------------------------------*/ | |
2922 | ||
28824b18 | 2923 | static int fsg_bind(struct usb_configuration *c, struct usb_function *f) |
d5e2b67a | 2924 | { |
d23b0f08 | 2925 | struct fsg_dev *fsg = fsg_from_func(f); |
dd02ea5a | 2926 | struct fsg_common *common = fsg->common; |
d23b0f08 | 2927 | struct usb_gadget *gadget = c->cdev->gadget; |
d5e2b67a | 2928 | int i; |
d5e2b67a | 2929 | struct usb_ep *ep; |
10287bae SAS |
2930 | unsigned max_burst; |
2931 | int ret; | |
e5eaa0dc | 2932 | struct fsg_opts *opts; |
7a93d040 | 2933 | |
dd02ea5a KO |
2934 | /* Don't allow to bind if we don't have at least one LUN */ |
2935 | ret = _fsg_common_get_max_lun(common); | |
2936 | if (ret < 0) { | |
2937 | pr_err("There should be at least one LUN.\n"); | |
2938 | return -EINVAL; | |
2939 | } | |
2940 | ||
e5eaa0dc AP |
2941 | opts = fsg_opts_from_func_inst(f->fi); |
2942 | if (!opts->no_configfs) { | |
2943 | ret = fsg_common_set_cdev(fsg->common, c->cdev, | |
2944 | fsg->common->can_stall); | |
2945 | if (ret) | |
2946 | return ret; | |
f91d2f43 | 2947 | fsg_common_set_inquiry_string(fsg->common, NULL, NULL); |
f78bbcae MN |
2948 | } |
2949 | ||
2950 | if (!common->thread_task) { | |
78db441d | 2951 | common->state = FSG_STATE_NORMAL; |
f78bbcae MN |
2952 | common->thread_task = |
2953 | kthread_create(fsg_main_thread, common, "file-storage"); | |
2954 | if (IS_ERR(common->thread_task)) { | |
78db441d | 2955 | ret = PTR_ERR(common->thread_task); |
f78bbcae MN |
2956 | common->thread_task = NULL; |
2957 | common->state = FSG_STATE_TERMINATED; | |
e5eaa0dc | 2958 | return ret; |
f78bbcae MN |
2959 | } |
2960 | DBG(common, "I/O thread pid: %d\n", | |
2961 | task_pid_nr(common->thread_task)); | |
2962 | wake_up_process(common->thread_task); | |
e5eaa0dc | 2963 | } |
e5eaa0dc | 2964 | |
d5e2b67a | 2965 | fsg->gadget = gadget; |
d5e2b67a | 2966 | |
d23b0f08 MN |
2967 | /* New interface */ |
2968 | i = usb_interface_id(c, f); | |
2969 | if (i < 0) | |
8078f314 | 2970 | goto fail; |
d23b0f08 MN |
2971 | fsg_intf_desc.bInterfaceNumber = i; |
2972 | fsg->interface_number = i; | |
d5e2b67a | 2973 | |
d5e2b67a | 2974 | /* Find all the endpoints we will use */ |
d5e2b67a MN |
2975 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); |
2976 | if (!ep) | |
2977 | goto autoconf_fail; | |
d5e2b67a MN |
2978 | fsg->bulk_in = ep; |
2979 | ||
2980 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc); | |
2981 | if (!ep) | |
2982 | goto autoconf_fail; | |
d5e2b67a MN |
2983 | fsg->bulk_out = ep; |
2984 | ||
10287bae SAS |
2985 | /* Assume endpoint addresses are the same for both speeds */ |
2986 | fsg_hs_bulk_in_desc.bEndpointAddress = | |
2987 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
2988 | fsg_hs_bulk_out_desc.bEndpointAddress = | |
2989 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
4bb99b7c | 2990 | |
10287bae SAS |
2991 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
2992 | max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15); | |
4bb99b7c | 2993 | |
10287bae SAS |
2994 | fsg_ss_bulk_in_desc.bEndpointAddress = |
2995 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
2996 | fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 2997 | |
10287bae SAS |
2998 | fsg_ss_bulk_out_desc.bEndpointAddress = |
2999 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
3000 | fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 3001 | |
10287bae | 3002 | ret = usb_assign_descriptors(f, fsg_fs_function, fsg_hs_function, |
59a3cedf | 3003 | fsg_ss_function, fsg_ss_function); |
10287bae SAS |
3004 | if (ret) |
3005 | goto autoconf_fail; | |
4bb99b7c | 3006 | |
d5e2b67a MN |
3007 | return 0; |
3008 | ||
3009 | autoconf_fail: | |
3010 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); | |
8078f314 SSR |
3011 | i = -ENOTSUPP; |
3012 | fail: | |
3013 | /* terminate the thread */ | |
3014 | if (fsg->common->state != FSG_STATE_TERMINATED) { | |
3015 | raise_exception(fsg->common, FSG_STATE_EXIT); | |
3016 | wait_for_completion(&fsg->common->thread_notifier); | |
3017 | } | |
3018 | return i; | |
d5e2b67a MN |
3019 | } |
3020 | ||
e5eaa0dc AP |
3021 | /****************************** ALLOCATE FUNCTION *************************/ |
3022 | ||
3023 | static void fsg_unbind(struct usb_configuration *c, struct usb_function *f) | |
3024 | { | |
3025 | struct fsg_dev *fsg = fsg_from_func(f); | |
3026 | struct fsg_common *common = fsg->common; | |
3027 | ||
3028 | DBG(fsg, "unbind\n"); | |
3029 | if (fsg->common->fsg == fsg) { | |
3030 | fsg->common->new_fsg = NULL; | |
3031 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); | |
3032 | /* FIXME: make interruptible or killable somehow? */ | |
3033 | wait_event(common->fsg_wait, common->fsg != fsg); | |
3034 | } | |
3035 | ||
e5eaa0dc | 3036 | usb_free_all_descriptors(&fsg->function); |
d5e2b67a | 3037 | } |
481e4929 | 3038 | |
ef0aa4b9 AP |
3039 | static inline struct fsg_lun_opts *to_fsg_lun_opts(struct config_item *item) |
3040 | { | |
3041 | return container_of(to_config_group(item), struct fsg_lun_opts, group); | |
3042 | } | |
3043 | ||
3044 | static inline struct fsg_opts *to_fsg_opts(struct config_item *item) | |
3045 | { | |
3046 | return container_of(to_config_group(item), struct fsg_opts, | |
3047 | func_inst.group); | |
3048 | } | |
3049 | ||
ef0aa4b9 AP |
3050 | static void fsg_lun_attr_release(struct config_item *item) |
3051 | { | |
3052 | struct fsg_lun_opts *lun_opts; | |
3053 | ||
3054 | lun_opts = to_fsg_lun_opts(item); | |
3055 | kfree(lun_opts); | |
3056 | } | |
3057 | ||
3058 | static struct configfs_item_operations fsg_lun_item_ops = { | |
5bb7289d | 3059 | .release = fsg_lun_attr_release, |
ef0aa4b9 AP |
3060 | }; |
3061 | ||
4a90cb20 | 3062 | static ssize_t fsg_lun_opts_file_show(struct config_item *item, char *page) |
ef0aa4b9 | 3063 | { |
4a90cb20 CH |
3064 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3065 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3066 | |
3067 | return fsg_show_file(opts->lun, &fsg_opts->common->filesem, page); | |
3068 | } | |
3069 | ||
4a90cb20 | 3070 | static ssize_t fsg_lun_opts_file_store(struct config_item *item, |
ef0aa4b9 AP |
3071 | const char *page, size_t len) |
3072 | { | |
4a90cb20 CH |
3073 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3074 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3075 | |
3076 | return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len); | |
3077 | } | |
3078 | ||
4a90cb20 | 3079 | CONFIGFS_ATTR(fsg_lun_opts_, file); |
ef0aa4b9 | 3080 | |
4a90cb20 | 3081 | static ssize_t fsg_lun_opts_ro_show(struct config_item *item, char *page) |
ef0aa4b9 | 3082 | { |
4a90cb20 | 3083 | return fsg_show_ro(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3084 | } |
3085 | ||
4a90cb20 | 3086 | static ssize_t fsg_lun_opts_ro_store(struct config_item *item, |
ef0aa4b9 AP |
3087 | const char *page, size_t len) |
3088 | { | |
4a90cb20 CH |
3089 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3090 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3091 | |
3092 | return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len); | |
3093 | } | |
3094 | ||
4a90cb20 | 3095 | CONFIGFS_ATTR(fsg_lun_opts_, ro); |
ef0aa4b9 | 3096 | |
4a90cb20 | 3097 | static ssize_t fsg_lun_opts_removable_show(struct config_item *item, |
ef0aa4b9 AP |
3098 | char *page) |
3099 | { | |
4a90cb20 | 3100 | return fsg_show_removable(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3101 | } |
3102 | ||
4a90cb20 | 3103 | static ssize_t fsg_lun_opts_removable_store(struct config_item *item, |
ef0aa4b9 AP |
3104 | const char *page, size_t len) |
3105 | { | |
4a90cb20 | 3106 | return fsg_store_removable(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3107 | } |
3108 | ||
4a90cb20 | 3109 | CONFIGFS_ATTR(fsg_lun_opts_, removable); |
ef0aa4b9 | 3110 | |
4a90cb20 | 3111 | static ssize_t fsg_lun_opts_cdrom_show(struct config_item *item, char *page) |
ef0aa4b9 | 3112 | { |
4a90cb20 | 3113 | return fsg_show_cdrom(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3114 | } |
3115 | ||
4a90cb20 | 3116 | static ssize_t fsg_lun_opts_cdrom_store(struct config_item *item, |
ef0aa4b9 AP |
3117 | const char *page, size_t len) |
3118 | { | |
4a90cb20 CH |
3119 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3120 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
b8798636 AP |
3121 | |
3122 | return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page, | |
3123 | len); | |
ef0aa4b9 AP |
3124 | } |
3125 | ||
4a90cb20 | 3126 | CONFIGFS_ATTR(fsg_lun_opts_, cdrom); |
ef0aa4b9 | 3127 | |
4a90cb20 | 3128 | static ssize_t fsg_lun_opts_nofua_show(struct config_item *item, char *page) |
ef0aa4b9 | 3129 | { |
4a90cb20 | 3130 | return fsg_show_nofua(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3131 | } |
3132 | ||
4a90cb20 | 3133 | static ssize_t fsg_lun_opts_nofua_store(struct config_item *item, |
ef0aa4b9 AP |
3134 | const char *page, size_t len) |
3135 | { | |
4a90cb20 | 3136 | return fsg_store_nofua(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3137 | } |
3138 | ||
4a90cb20 | 3139 | CONFIGFS_ATTR(fsg_lun_opts_, nofua); |
ef0aa4b9 | 3140 | |
6ac47090 PG |
3141 | static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item, |
3142 | char *page) | |
3143 | { | |
3144 | return fsg_show_inquiry_string(to_fsg_lun_opts(item)->lun, page); | |
3145 | } | |
3146 | ||
3147 | static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item, | |
3148 | const char *page, size_t len) | |
3149 | { | |
3150 | return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len); | |
3151 | } | |
3152 | ||
3153 | CONFIGFS_ATTR(fsg_lun_opts_, inquiry_string); | |
3154 | ||
ef0aa4b9 | 3155 | static struct configfs_attribute *fsg_lun_attrs[] = { |
4a90cb20 CH |
3156 | &fsg_lun_opts_attr_file, |
3157 | &fsg_lun_opts_attr_ro, | |
3158 | &fsg_lun_opts_attr_removable, | |
3159 | &fsg_lun_opts_attr_cdrom, | |
3160 | &fsg_lun_opts_attr_nofua, | |
6ac47090 | 3161 | &fsg_lun_opts_attr_inquiry_string, |
ef0aa4b9 AP |
3162 | NULL, |
3163 | }; | |
3164 | ||
3165 | static struct config_item_type fsg_lun_type = { | |
3166 | .ct_item_ops = &fsg_lun_item_ops, | |
3167 | .ct_attrs = fsg_lun_attrs, | |
3168 | .ct_owner = THIS_MODULE, | |
3169 | }; | |
3170 | ||
ef0aa4b9 AP |
3171 | static struct config_group *fsg_lun_make(struct config_group *group, |
3172 | const char *name) | |
3173 | { | |
3174 | struct fsg_lun_opts *opts; | |
3175 | struct fsg_opts *fsg_opts; | |
3176 | struct fsg_lun_config config; | |
3177 | char *num_str; | |
3178 | u8 num; | |
3179 | int ret; | |
3180 | ||
3181 | num_str = strchr(name, '.'); | |
3182 | if (!num_str) { | |
3183 | pr_err("Unable to locate . in LUN.NUMBER\n"); | |
3184 | return ERR_PTR(-EINVAL); | |
3185 | } | |
3186 | num_str++; | |
3187 | ||
3188 | ret = kstrtou8(num_str, 0, &num); | |
3189 | if (ret) | |
3190 | return ERR_PTR(ret); | |
3191 | ||
3192 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3193 | if (num >= FSG_MAX_LUNS) | |
5bb7289d AP |
3194 | return ERR_PTR(-ERANGE); |
3195 | ||
ef0aa4b9 AP |
3196 | mutex_lock(&fsg_opts->lock); |
3197 | if (fsg_opts->refcnt || fsg_opts->common->luns[num]) { | |
3198 | ret = -EBUSY; | |
3199 | goto out; | |
3200 | } | |
3201 | ||
3202 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3203 | if (!opts) { | |
3204 | ret = -ENOMEM; | |
3205 | goto out; | |
3206 | } | |
3207 | ||
3208 | memset(&config, 0, sizeof(config)); | |
3209 | config.removable = true; | |
3210 | ||
ef0aa4b9 AP |
3211 | ret = fsg_common_create_lun(fsg_opts->common, &config, num, name, |
3212 | (const char **)&group->cg_item.ci_name); | |
3213 | if (ret) { | |
3214 | kfree(opts); | |
3215 | goto out; | |
3216 | } | |
3217 | opts->lun = fsg_opts->common->luns[num]; | |
3218 | opts->lun_id = num; | |
3219 | mutex_unlock(&fsg_opts->lock); | |
3220 | ||
3221 | config_group_init_type_name(&opts->group, name, &fsg_lun_type); | |
3222 | ||
3223 | return &opts->group; | |
3224 | out: | |
3225 | mutex_unlock(&fsg_opts->lock); | |
3226 | return ERR_PTR(ret); | |
3227 | } | |
3228 | ||
3229 | static void fsg_lun_drop(struct config_group *group, struct config_item *item) | |
3230 | { | |
3231 | struct fsg_lun_opts *lun_opts; | |
3232 | struct fsg_opts *fsg_opts; | |
3233 | ||
3234 | lun_opts = to_fsg_lun_opts(item); | |
3235 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3236 | ||
3237 | mutex_lock(&fsg_opts->lock); | |
3238 | if (fsg_opts->refcnt) { | |
3239 | struct config_item *gadget; | |
3240 | ||
3241 | gadget = group->cg_item.ci_parent->ci_parent; | |
3242 | unregister_gadget_item(gadget); | |
3243 | } | |
3244 | ||
5542f58c | 3245 | fsg_common_remove_lun(lun_opts->lun); |
ef0aa4b9 AP |
3246 | fsg_opts->common->luns[lun_opts->lun_id] = NULL; |
3247 | lun_opts->lun_id = 0; | |
3248 | mutex_unlock(&fsg_opts->lock); | |
3249 | ||
3250 | config_item_put(item); | |
3251 | } | |
3252 | ||
ef0aa4b9 AP |
3253 | static void fsg_attr_release(struct config_item *item) |
3254 | { | |
3255 | struct fsg_opts *opts = to_fsg_opts(item); | |
3256 | ||
3257 | usb_put_function_instance(&opts->func_inst); | |
3258 | } | |
3259 | ||
3260 | static struct configfs_item_operations fsg_item_ops = { | |
5bb7289d | 3261 | .release = fsg_attr_release, |
ef0aa4b9 AP |
3262 | }; |
3263 | ||
4a90cb20 | 3264 | static ssize_t fsg_opts_stall_show(struct config_item *item, char *page) |
ef0aa4b9 | 3265 | { |
4a90cb20 | 3266 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3267 | int result; |
3268 | ||
3269 | mutex_lock(&opts->lock); | |
3270 | result = sprintf(page, "%d", opts->common->can_stall); | |
3271 | mutex_unlock(&opts->lock); | |
3272 | ||
3273 | return result; | |
3274 | } | |
3275 | ||
4a90cb20 | 3276 | static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page, |
ef0aa4b9 AP |
3277 | size_t len) |
3278 | { | |
4a90cb20 | 3279 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 | 3280 | int ret; |
5bb7289d | 3281 | bool stall; |
ef0aa4b9 AP |
3282 | |
3283 | mutex_lock(&opts->lock); | |
5bb7289d | 3284 | |
ef0aa4b9 | 3285 | if (opts->refcnt) { |
5bb7289d AP |
3286 | mutex_unlock(&opts->lock); |
3287 | return -EBUSY; | |
ef0aa4b9 | 3288 | } |
ef0aa4b9 | 3289 | |
5bb7289d AP |
3290 | ret = strtobool(page, &stall); |
3291 | if (!ret) { | |
3292 | opts->common->can_stall = stall; | |
3293 | ret = len; | |
3294 | } | |
ef0aa4b9 | 3295 | |
ef0aa4b9 | 3296 | mutex_unlock(&opts->lock); |
5bb7289d | 3297 | |
ef0aa4b9 AP |
3298 | return ret; |
3299 | } | |
3300 | ||
4a90cb20 | 3301 | CONFIGFS_ATTR(fsg_opts_, stall); |
ef0aa4b9 AP |
3302 | |
3303 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
4a90cb20 | 3304 | static ssize_t fsg_opts_num_buffers_show(struct config_item *item, char *page) |
ef0aa4b9 | 3305 | { |
4a90cb20 | 3306 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3307 | int result; |
3308 | ||
3309 | mutex_lock(&opts->lock); | |
3310 | result = sprintf(page, "%d", opts->common->fsg_num_buffers); | |
3311 | mutex_unlock(&opts->lock); | |
3312 | ||
3313 | return result; | |
3314 | } | |
3315 | ||
4a90cb20 | 3316 | static ssize_t fsg_opts_num_buffers_store(struct config_item *item, |
ef0aa4b9 AP |
3317 | const char *page, size_t len) |
3318 | { | |
4a90cb20 | 3319 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3320 | int ret; |
3321 | u8 num; | |
3322 | ||
3323 | mutex_lock(&opts->lock); | |
3324 | if (opts->refcnt) { | |
3325 | ret = -EBUSY; | |
3326 | goto end; | |
3327 | } | |
3328 | ret = kstrtou8(page, 0, &num); | |
3329 | if (ret) | |
3330 | goto end; | |
3331 | ||
ef0aa4b9 AP |
3332 | fsg_common_set_num_buffers(opts->common, num); |
3333 | ret = len; | |
3334 | ||
3335 | end: | |
3336 | mutex_unlock(&opts->lock); | |
3337 | return ret; | |
3338 | } | |
3339 | ||
4a90cb20 | 3340 | CONFIGFS_ATTR(fsg_opts_, num_buffers); |
ef0aa4b9 AP |
3341 | #endif |
3342 | ||
3343 | static struct configfs_attribute *fsg_attrs[] = { | |
4a90cb20 | 3344 | &fsg_opts_attr_stall, |
ef0aa4b9 | 3345 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES |
4a90cb20 | 3346 | &fsg_opts_attr_num_buffers, |
ef0aa4b9 AP |
3347 | #endif |
3348 | NULL, | |
3349 | }; | |
3350 | ||
3351 | static struct configfs_group_operations fsg_group_ops = { | |
3352 | .make_group = fsg_lun_make, | |
3353 | .drop_item = fsg_lun_drop, | |
3354 | }; | |
3355 | ||
3356 | static struct config_item_type fsg_func_type = { | |
3357 | .ct_item_ops = &fsg_item_ops, | |
3358 | .ct_group_ops = &fsg_group_ops, | |
3359 | .ct_attrs = fsg_attrs, | |
3360 | .ct_owner = THIS_MODULE, | |
3361 | }; | |
3362 | ||
e5eaa0dc AP |
3363 | static void fsg_free_inst(struct usb_function_instance *fi) |
3364 | { | |
3365 | struct fsg_opts *opts; | |
3366 | ||
3367 | opts = fsg_opts_from_func_inst(fi); | |
3368 | fsg_common_put(opts->common); | |
3369 | kfree(opts); | |
3370 | } | |
3371 | ||
3372 | static struct usb_function_instance *fsg_alloc_inst(void) | |
3373 | { | |
3374 | struct fsg_opts *opts; | |
ef0aa4b9 | 3375 | struct fsg_lun_config config; |
e5eaa0dc AP |
3376 | int rc; |
3377 | ||
3378 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3379 | if (!opts) | |
3380 | return ERR_PTR(-ENOMEM); | |
ef0aa4b9 | 3381 | mutex_init(&opts->lock); |
e5eaa0dc | 3382 | opts->func_inst.free_func_inst = fsg_free_inst; |
7a93d040 | 3383 | opts->common = fsg_common_setup(opts->common); |
e5eaa0dc AP |
3384 | if (IS_ERR(opts->common)) { |
3385 | rc = PTR_ERR(opts->common); | |
3386 | goto release_opts; | |
3387 | } | |
e5eaa0dc AP |
3388 | |
3389 | rc = fsg_common_set_num_buffers(opts->common, | |
3390 | CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS); | |
3391 | if (rc) | |
dd02ea5a | 3392 | goto release_opts; |
e5eaa0dc AP |
3393 | |
3394 | pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); | |
3395 | ||
ef0aa4b9 AP |
3396 | memset(&config, 0, sizeof(config)); |
3397 | config.removable = true; | |
3398 | rc = fsg_common_create_lun(opts->common, &config, 0, "lun.0", | |
3399 | (const char **)&opts->func_inst.group.cg_item.ci_name); | |
903588a9 KO |
3400 | if (rc) |
3401 | goto release_buffers; | |
3402 | ||
ef0aa4b9 AP |
3403 | opts->lun0.lun = opts->common->luns[0]; |
3404 | opts->lun0.lun_id = 0; | |
ef0aa4b9 AP |
3405 | |
3406 | config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type); | |
3407 | ||
1ae1602d CH |
3408 | config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type); |
3409 | configfs_add_default_group(&opts->lun0.group, &opts->func_inst.group); | |
3410 | ||
e5eaa0dc AP |
3411 | return &opts->func_inst; |
3412 | ||
903588a9 KO |
3413 | release_buffers: |
3414 | fsg_common_free_buffers(opts->common); | |
e5eaa0dc AP |
3415 | release_opts: |
3416 | kfree(opts); | |
3417 | return ERR_PTR(rc); | |
3418 | } | |
3419 | ||
3420 | static void fsg_free(struct usb_function *f) | |
3421 | { | |
3422 | struct fsg_dev *fsg; | |
ef0aa4b9 | 3423 | struct fsg_opts *opts; |
e5eaa0dc AP |
3424 | |
3425 | fsg = container_of(f, struct fsg_dev, function); | |
ef0aa4b9 AP |
3426 | opts = container_of(f->fi, struct fsg_opts, func_inst); |
3427 | ||
3428 | mutex_lock(&opts->lock); | |
3429 | opts->refcnt--; | |
3430 | mutex_unlock(&opts->lock); | |
e5eaa0dc AP |
3431 | |
3432 | kfree(fsg); | |
3433 | } | |
3434 | ||
3435 | static struct usb_function *fsg_alloc(struct usb_function_instance *fi) | |
3436 | { | |
3437 | struct fsg_opts *opts = fsg_opts_from_func_inst(fi); | |
3438 | struct fsg_common *common = opts->common; | |
3439 | struct fsg_dev *fsg; | |
3440 | ||
3441 | fsg = kzalloc(sizeof(*fsg), GFP_KERNEL); | |
3442 | if (unlikely(!fsg)) | |
3443 | return ERR_PTR(-ENOMEM); | |
3444 | ||
ef0aa4b9 AP |
3445 | mutex_lock(&opts->lock); |
3446 | opts->refcnt++; | |
3447 | mutex_unlock(&opts->lock); | |
8515bac0 | 3448 | |
e5eaa0dc AP |
3449 | fsg->function.name = FSG_DRIVER_DESC; |
3450 | fsg->function.bind = fsg_bind; | |
3451 | fsg->function.unbind = fsg_unbind; | |
3452 | fsg->function.setup = fsg_setup; | |
3453 | fsg->function.set_alt = fsg_set_alt; | |
3454 | fsg->function.disable = fsg_disable; | |
3455 | fsg->function.free_func = fsg_free; | |
3456 | ||
3457 | fsg->common = common; | |
3458 | ||
3459 | return &fsg->function; | |
3460 | } | |
3461 | ||
3462 | DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc); | |
3463 | MODULE_LICENSE("GPL"); | |
3464 | MODULE_AUTHOR("Michal Nazarewicz"); | |
3465 | ||
481e4929 MN |
3466 | /************************* Module parameters *************************/ |
3467 | ||
6fdc5dd2 | 3468 | |
f3fed367 | 3469 | void fsg_config_from_params(struct fsg_config *cfg, |
6fdc5dd2 AP |
3470 | const struct fsg_module_parameters *params, |
3471 | unsigned int fsg_num_buffers) | |
481e4929 MN |
3472 | { |
3473 | struct fsg_lun_config *lun; | |
d26a6aa0 | 3474 | unsigned i; |
481e4929 MN |
3475 | |
3476 | /* Configure LUNs */ | |
d26a6aa0 MN |
3477 | cfg->nluns = |
3478 | min(params->luns ?: (params->file_count ?: 1u), | |
3479 | (unsigned)FSG_MAX_LUNS); | |
3480 | for (i = 0, lun = cfg->luns; i < cfg->nluns; ++i, ++lun) { | |
481e4929 MN |
3481 | lun->ro = !!params->ro[i]; |
3482 | lun->cdrom = !!params->cdrom[i]; | |
fa84c575 | 3483 | lun->removable = !!params->removable[i]; |
481e4929 MN |
3484 | lun->filename = |
3485 | params->file_count > i && params->file[i][0] | |
3486 | ? params->file[i] | |
136c489b | 3487 | : NULL; |
481e4929 MN |
3488 | } |
3489 | ||
d26a6aa0 | 3490 | /* Let MSF use defaults */ |
136c489b JH |
3491 | cfg->vendor_name = NULL; |
3492 | cfg->product_name = NULL; | |
481e4929 | 3493 | |
8876f5e7 MN |
3494 | cfg->ops = NULL; |
3495 | cfg->private_data = NULL; | |
c85efcb9 | 3496 | |
481e4929 MN |
3497 | /* Finalise */ |
3498 | cfg->can_stall = params->stall; | |
6fdc5dd2 | 3499 | cfg->fsg_num_buffers = fsg_num_buffers; |
481e4929 | 3500 | } |
7a93d040 | 3501 | EXPORT_SYMBOL_GPL(fsg_config_from_params); |