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