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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> | |
210 | #include <linux/limits.h> | |
211 | #include <linux/rwsem.h> | |
212 | #include <linux/slab.h> | |
213 | #include <linux/spinlock.h> | |
214 | #include <linux/string.h> | |
215 | #include <linux/freezer.h> | |
e5eaa0dc | 216 | #include <linux/module.h> |
4a1e9211 | 217 | #include <linux/uaccess.h> |
d5e2b67a MN |
218 | |
219 | #include <linux/usb/ch9.h> | |
220 | #include <linux/usb/gadget.h> | |
a283c03a | 221 | #include <linux/usb/composite.h> |
d5e2b67a | 222 | |
ef0aa4b9 | 223 | #include "configfs.h" |
d5e2b67a MN |
224 | |
225 | ||
e8b6f8c5 | 226 | /*------------------------------------------------------------------------*/ |
d5e2b67a | 227 | |
d23b0f08 | 228 | #define FSG_DRIVER_DESC "Mass Storage Function" |
d26a6aa0 | 229 | #define FSG_DRIVER_VERSION "2009/09/11" |
d5e2b67a | 230 | |
d5e2b67a MN |
231 | static const char fsg_string_interface[] = "Mass Storage"; |
232 | ||
6fdc5dd2 | 233 | #include "storage_common.h" |
f3fed367 | 234 | #include "f_mass_storage.h" |
d5e2b67a | 235 | |
6fdc5dd2 AP |
236 | /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ |
237 | static struct usb_string fsg_strings[] = { | |
238 | {FSG_STRING_INTERFACE, fsg_string_interface}, | |
239 | {} | |
240 | }; | |
241 | ||
242 | static struct usb_gadget_strings fsg_stringtab = { | |
243 | .language = 0x0409, /* en-us */ | |
244 | .strings = fsg_strings, | |
245 | }; | |
d5e2b67a | 246 | |
4610f19b AP |
247 | static struct usb_gadget_strings *fsg_strings_array[] = { |
248 | &fsg_stringtab, | |
249 | NULL, | |
250 | }; | |
251 | ||
d5e2b67a MN |
252 | /*-------------------------------------------------------------------------*/ |
253 | ||
8ea864cf | 254 | struct fsg_dev; |
8876f5e7 MN |
255 | struct fsg_common; |
256 | ||
a41ae418 MN |
257 | /* Data shared by all the FSG instances. */ |
258 | struct fsg_common { | |
9c610213 | 259 | struct usb_gadget *gadget; |
95ed3236 | 260 | struct usb_composite_dev *cdev; |
b894f60a MN |
261 | struct fsg_dev *fsg, *new_fsg; |
262 | wait_queue_head_t fsg_wait; | |
9c610213 | 263 | |
a41ae418 MN |
264 | /* filesem protects: backing files in use */ |
265 | struct rw_semaphore filesem; | |
266 | ||
8ea864cf MN |
267 | /* lock protects: state, all the req_busy's */ |
268 | spinlock_t lock; | |
269 | ||
270 | struct usb_ep *ep0; /* Copy of gadget->ep0 */ | |
271 | struct usb_request *ep0req; /* Copy of cdev->req */ | |
272 | unsigned int ep0_req_tag; | |
8ea864cf | 273 | |
a41ae418 MN |
274 | struct fsg_buffhd *next_buffhd_to_fill; |
275 | struct fsg_buffhd *next_buffhd_to_drain; | |
6532c7fd | 276 | struct fsg_buffhd *buffhds; |
6fdc5dd2 | 277 | unsigned int fsg_num_buffers; |
a41ae418 MN |
278 | |
279 | int cmnd_size; | |
280 | u8 cmnd[MAX_COMMAND_SIZE]; | |
281 | ||
a41ae418 | 282 | unsigned int lun; |
dd02ea5a | 283 | struct fsg_lun *luns[FSG_MAX_LUNS]; |
a41ae418 | 284 | struct fsg_lun *curlun; |
9c610213 | 285 | |
8ea864cf MN |
286 | unsigned int bulk_out_maxpacket; |
287 | enum fsg_state state; /* For exception handling */ | |
288 | unsigned int exception_req_tag; | |
289 | ||
8ea864cf MN |
290 | enum data_direction data_dir; |
291 | u32 data_size; | |
292 | u32 data_size_from_cmnd; | |
293 | u32 tag; | |
294 | u32 residue; | |
295 | u32 usb_amount_left; | |
296 | ||
481e4929 | 297 | unsigned int can_stall:1; |
9c610213 | 298 | unsigned int free_storage_on_release:1; |
8ea864cf MN |
299 | unsigned int phase_error:1; |
300 | unsigned int short_packet_received:1; | |
301 | unsigned int bad_lun_okay:1; | |
302 | unsigned int running:1; | |
bd528d4e | 303 | unsigned int sysfs:1; |
9c610213 | 304 | |
8ea864cf MN |
305 | int thread_wakeup_needed; |
306 | struct completion thread_notifier; | |
307 | struct task_struct *thread_task; | |
e8b6f8c5 | 308 | |
8876f5e7 MN |
309 | /* Callback functions. */ |
310 | const struct fsg_operations *ops; | |
c85efcb9 MN |
311 | /* Gadget's private data. */ |
312 | void *private_data; | |
313 | ||
6ac47090 | 314 | char inquiry_string[INQUIRY_STRING_LEN]; |
481e4929 | 315 | |
9c610213 | 316 | struct kref ref; |
a41ae418 MN |
317 | }; |
318 | ||
d5e2b67a | 319 | struct fsg_dev { |
d23b0f08 | 320 | struct usb_function function; |
d23b0f08 | 321 | struct usb_gadget *gadget; /* Copy of cdev->gadget */ |
a41ae418 MN |
322 | struct fsg_common *common; |
323 | ||
d23b0f08 MN |
324 | u16 interface_number; |
325 | ||
d26a6aa0 MN |
326 | unsigned int bulk_in_enabled:1; |
327 | unsigned int bulk_out_enabled:1; | |
d5e2b67a MN |
328 | |
329 | unsigned long atomic_bitflags; | |
8ea864cf | 330 | #define IGNORE_BULK_OUT 0 |
d5e2b67a MN |
331 | |
332 | struct usb_ep *bulk_in; | |
333 | struct usb_ep *bulk_out; | |
8ea864cf | 334 | }; |
d5e2b67a | 335 | |
8ea864cf MN |
336 | static inline int __fsg_is_set(struct fsg_common *common, |
337 | const char *func, unsigned line) | |
338 | { | |
339 | if (common->fsg) | |
340 | return 1; | |
341 | ERROR(common, "common->fsg is NULL in %s at %u\n", func, line); | |
8876f5e7 | 342 | WARN_ON(1); |
8ea864cf MN |
343 | return 0; |
344 | } | |
345 | ||
346 | #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__)) | |
d5e2b67a | 347 | |
d23b0f08 MN |
348 | static inline struct fsg_dev *fsg_from_func(struct usb_function *f) |
349 | { | |
350 | return container_of(f, struct fsg_dev, function); | |
351 | } | |
352 | ||
d5e2b67a MN |
353 | typedef void (*fsg_routine_t)(struct fsg_dev *); |
354 | ||
8ea864cf | 355 | static int exception_in_progress(struct fsg_common *common) |
d5e2b67a | 356 | { |
8ea864cf | 357 | return common->state > FSG_STATE_IDLE; |
d5e2b67a MN |
358 | } |
359 | ||
98346f7d GKH |
360 | /* Make bulk-out requests be divisible by the maxpacket size */ |
361 | static void set_bulk_out_req_length(struct fsg_common *common, | |
362 | struct fsg_buffhd *bh, unsigned int length) | |
363 | { | |
364 | unsigned int rem; | |
365 | ||
366 | bh->bulk_out_intended_length = length; | |
367 | rem = length % common->bulk_out_maxpacket; | |
368 | if (rem > 0) | |
369 | length += common->bulk_out_maxpacket - rem; | |
370 | bh->outreq->length = length; | |
371 | } | |
372 | ||
373 | ||
d5e2b67a MN |
374 | /*-------------------------------------------------------------------------*/ |
375 | ||
376 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) | |
377 | { | |
378 | const char *name; | |
379 | ||
380 | if (ep == fsg->bulk_in) | |
381 | name = "bulk-in"; | |
382 | else if (ep == fsg->bulk_out) | |
383 | name = "bulk-out"; | |
384 | else | |
385 | name = ep->name; | |
386 | DBG(fsg, "%s set halt\n", name); | |
387 | return usb_ep_set_halt(ep); | |
388 | } | |
389 | ||
390 | ||
d5e2b67a MN |
391 | /*-------------------------------------------------------------------------*/ |
392 | ||
393 | /* These routines may be called in process context or in_irq */ | |
394 | ||
395 | /* Caller must hold fsg->lock */ | |
8ea864cf | 396 | static void wakeup_thread(struct fsg_common *common) |
d5e2b67a | 397 | { |
d68c277b | 398 | smp_wmb(); /* ensure the write of bh->state is complete */ |
d5e2b67a | 399 | /* Tell the main thread that something has happened */ |
8ea864cf MN |
400 | common->thread_wakeup_needed = 1; |
401 | if (common->thread_task) | |
402 | wake_up_process(common->thread_task); | |
d5e2b67a MN |
403 | } |
404 | ||
8ea864cf | 405 | static void raise_exception(struct fsg_common *common, enum fsg_state new_state) |
d5e2b67a MN |
406 | { |
407 | unsigned long flags; | |
408 | ||
b73af61e MN |
409 | /* |
410 | * Do nothing if a higher-priority exception is already in progress. | |
d5e2b67a | 411 | * If a lower-or-equal priority exception is in progress, preempt it |
b73af61e MN |
412 | * and notify the main thread by sending it a signal. |
413 | */ | |
8ea864cf MN |
414 | spin_lock_irqsave(&common->lock, flags); |
415 | if (common->state <= new_state) { | |
416 | common->exception_req_tag = common->ep0_req_tag; | |
417 | common->state = new_state; | |
418 | if (common->thread_task) | |
d5e2b67a | 419 | send_sig_info(SIGUSR1, SEND_SIG_FORCED, |
8ea864cf | 420 | common->thread_task); |
d5e2b67a | 421 | } |
8ea864cf | 422 | spin_unlock_irqrestore(&common->lock, flags); |
d5e2b67a MN |
423 | } |
424 | ||
425 | ||
426 | /*-------------------------------------------------------------------------*/ | |
427 | ||
8ea864cf | 428 | static int ep0_queue(struct fsg_common *common) |
d5e2b67a MN |
429 | { |
430 | int rc; | |
431 | ||
8ea864cf MN |
432 | rc = usb_ep_queue(common->ep0, common->ep0req, GFP_ATOMIC); |
433 | common->ep0->driver_data = common; | |
d5e2b67a | 434 | if (rc != 0 && rc != -ESHUTDOWN) { |
d5e2b67a | 435 | /* We can't do much more than wait for a reset */ |
8ea864cf MN |
436 | WARNING(common, "error in submission: %s --> %d\n", |
437 | common->ep0->name, rc); | |
d5e2b67a MN |
438 | } |
439 | return rc; | |
440 | } | |
441 | ||
b73af61e | 442 | |
d5e2b67a MN |
443 | /*-------------------------------------------------------------------------*/ |
444 | ||
b73af61e | 445 | /* Completion handlers. These always run in_irq. */ |
d5e2b67a MN |
446 | |
447 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) | |
448 | { | |
8ea864cf | 449 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
450 | struct fsg_buffhd *bh = req->context; |
451 | ||
452 | if (req->status || req->actual != req->length) | |
8ea864cf | 453 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
b73af61e | 454 | req->status, req->actual, req->length); |
d26a6aa0 | 455 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
456 | usb_ep_fifo_flush(ep); |
457 | ||
458 | /* Hold the lock while we update the request and buffer states */ | |
459 | smp_wmb(); | |
8ea864cf | 460 | spin_lock(&common->lock); |
d5e2b67a MN |
461 | bh->inreq_busy = 0; |
462 | bh->state = BUF_STATE_EMPTY; | |
8ea864cf MN |
463 | wakeup_thread(common); |
464 | spin_unlock(&common->lock); | |
d5e2b67a MN |
465 | } |
466 | ||
467 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) | |
468 | { | |
8ea864cf | 469 | struct fsg_common *common = ep->driver_data; |
d5e2b67a MN |
470 | struct fsg_buffhd *bh = req->context; |
471 | ||
8ea864cf | 472 | dump_msg(common, "bulk-out", req->buf, req->actual); |
98346f7d | 473 | if (req->status || req->actual != bh->bulk_out_intended_length) |
8ea864cf | 474 | DBG(common, "%s --> %d, %u/%u\n", __func__, |
98346f7d | 475 | req->status, req->actual, bh->bulk_out_intended_length); |
d26a6aa0 | 476 | if (req->status == -ECONNRESET) /* Request was cancelled */ |
d5e2b67a MN |
477 | usb_ep_fifo_flush(ep); |
478 | ||
479 | /* Hold the lock while we update the request and buffer states */ | |
480 | smp_wmb(); | |
8ea864cf | 481 | spin_lock(&common->lock); |
d5e2b67a MN |
482 | bh->outreq_busy = 0; |
483 | bh->state = BUF_STATE_FULL; | |
8ea864cf MN |
484 | wakeup_thread(common); |
485 | spin_unlock(&common->lock); | |
d5e2b67a MN |
486 | } |
487 | ||
dd02ea5a KO |
488 | static int _fsg_common_get_max_lun(struct fsg_common *common) |
489 | { | |
490 | int i = ARRAY_SIZE(common->luns) - 1; | |
491 | ||
492 | while (i >= 0 && !common->luns[i]) | |
493 | --i; | |
494 | ||
495 | return i; | |
496 | } | |
497 | ||
d23b0f08 | 498 | static int fsg_setup(struct usb_function *f, |
b73af61e | 499 | const struct usb_ctrlrequest *ctrl) |
d5e2b67a | 500 | { |
d23b0f08 | 501 | struct fsg_dev *fsg = fsg_from_func(f); |
8ea864cf | 502 | struct usb_request *req = fsg->common->ep0req; |
d5e2b67a | 503 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
93bcf12e | 504 | u16 w_value = le16_to_cpu(ctrl->wValue); |
d5e2b67a MN |
505 | u16 w_length = le16_to_cpu(ctrl->wLength); |
506 | ||
b894f60a | 507 | if (!fsg_is_set(fsg->common)) |
93bcf12e | 508 | return -EOPNOTSUPP; |
d5e2b67a | 509 | |
73ee4da9 RQ |
510 | ++fsg->common->ep0_req_tag; /* Record arrival of a new request */ |
511 | req->context = NULL; | |
512 | req->length = 0; | |
513 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); | |
514 | ||
93bcf12e | 515 | switch (ctrl->bRequest) { |
d5e2b67a | 516 | |
775dafdc | 517 | case US_BULK_RESET_REQUEST: |
93bcf12e MN |
518 | if (ctrl->bRequestType != |
519 | (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 520 | break; |
ce7b6121 PZ |
521 | if (w_index != fsg->interface_number || w_value != 0 || |
522 | w_length != 0) | |
93bcf12e | 523 | return -EDOM; |
d5e2b67a | 524 | |
b73af61e MN |
525 | /* |
526 | * Raise an exception to stop the current operation | |
527 | * and reinitialize our state. | |
528 | */ | |
93bcf12e | 529 | DBG(fsg, "bulk reset request\n"); |
8ea864cf | 530 | raise_exception(fsg->common, FSG_STATE_RESET); |
655403c2 | 531 | return USB_GADGET_DELAYED_STATUS; |
d5e2b67a | 532 | |
775dafdc | 533 | case US_BULK_GET_MAX_LUN: |
93bcf12e MN |
534 | if (ctrl->bRequestType != |
535 | (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
d5e2b67a | 536 | break; |
db332bc9 PZ |
537 | if (w_index != fsg->interface_number || w_value != 0 || |
538 | w_length != 1) | |
93bcf12e MN |
539 | return -EDOM; |
540 | VDBG(fsg, "get max LUN\n"); | |
dd02ea5a | 541 | *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); |
b00ce11f MN |
542 | |
543 | /* Respond with data/status */ | |
d7e18a9f | 544 | req->length = min((u16)1, w_length); |
b00ce11f | 545 | return ep0_queue(fsg->common); |
93bcf12e MN |
546 | } |
547 | ||
548 | VDBG(fsg, | |
b73af61e | 549 | "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n", |
93bcf12e MN |
550 | ctrl->bRequestType, ctrl->bRequest, |
551 | le16_to_cpu(ctrl->wValue), w_index, w_length); | |
552 | return -EOPNOTSUPP; | |
d5e2b67a MN |
553 | } |
554 | ||
555 | ||
d5e2b67a MN |
556 | /*-------------------------------------------------------------------------*/ |
557 | ||
558 | /* All the following routines run in process context */ | |
559 | ||
d5e2b67a MN |
560 | /* Use this for bulk or interrupt transfers, not ep0 */ |
561 | static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, | |
b73af61e MN |
562 | struct usb_request *req, int *pbusy, |
563 | enum fsg_buffer_state *state) | |
d5e2b67a MN |
564 | { |
565 | int rc; | |
566 | ||
567 | if (ep == fsg->bulk_in) | |
568 | dump_msg(fsg, "bulk-in", req->buf, req->length); | |
d5e2b67a | 569 | |
8ea864cf | 570 | spin_lock_irq(&fsg->common->lock); |
d5e2b67a MN |
571 | *pbusy = 1; |
572 | *state = BUF_STATE_BUSY; | |
8ea864cf | 573 | spin_unlock_irq(&fsg->common->lock); |
4953ef65 | 574 | |
d5e2b67a | 575 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
4953ef65 MN |
576 | if (rc == 0) |
577 | return; /* All good, we're done */ | |
d5e2b67a | 578 | |
4953ef65 MN |
579 | *pbusy = 0; |
580 | *state = BUF_STATE_EMPTY; | |
d5e2b67a | 581 | |
4953ef65 MN |
582 | /* We can't do much more than wait for a reset */ |
583 | ||
584 | /* | |
585 | * Note: currently the net2280 driver fails zero-length | |
586 | * submissions if DMA is enabled. | |
587 | */ | |
588 | if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP && req->length == 0)) | |
589 | WARNING(fsg, "error in submission: %s --> %d\n", ep->name, rc); | |
d5e2b67a MN |
590 | } |
591 | ||
fe52f792 MN |
592 | static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
593 | { | |
594 | if (!fsg_is_set(common)) | |
595 | return false; | |
596 | start_transfer(common->fsg, common->fsg->bulk_in, | |
597 | bh->inreq, &bh->inreq_busy, &bh->state); | |
598 | return true; | |
599 | } | |
8ea864cf | 600 | |
fe52f792 MN |
601 | static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
602 | { | |
603 | if (!fsg_is_set(common)) | |
604 | return false; | |
605 | start_transfer(common->fsg, common->fsg->bulk_out, | |
606 | bh->outreq, &bh->outreq_busy, &bh->state); | |
607 | return true; | |
608 | } | |
d5e2b67a | 609 | |
2cf93bea | 610 | static int sleep_thread(struct fsg_common *common, bool can_freeze) |
d5e2b67a MN |
611 | { |
612 | int rc = 0; | |
613 | ||
614 | /* Wait until a signal arrives or we are woken up */ | |
615 | for (;;) { | |
2cf93bea GC |
616 | if (can_freeze) |
617 | try_to_freeze(); | |
d5e2b67a MN |
618 | set_current_state(TASK_INTERRUPTIBLE); |
619 | if (signal_pending(current)) { | |
620 | rc = -EINTR; | |
621 | break; | |
622 | } | |
8ea864cf | 623 | if (common->thread_wakeup_needed) |
d5e2b67a MN |
624 | break; |
625 | schedule(); | |
626 | } | |
627 | __set_current_state(TASK_RUNNING); | |
8ea864cf | 628 | common->thread_wakeup_needed = 0; |
d68c277b | 629 | smp_rmb(); /* ensure the latest bh->state is visible */ |
d5e2b67a MN |
630 | return rc; |
631 | } | |
632 | ||
633 | ||
634 | /*-------------------------------------------------------------------------*/ | |
635 | ||
8ea864cf | 636 | static int do_read(struct fsg_common *common) |
d5e2b67a | 637 | { |
8ea864cf | 638 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
639 | u32 lba; |
640 | struct fsg_buffhd *bh; | |
641 | int rc; | |
642 | u32 amount_left; | |
643 | loff_t file_offset, file_offset_tmp; | |
644 | unsigned int amount; | |
d5e2b67a MN |
645 | ssize_t nread; |
646 | ||
b73af61e MN |
647 | /* |
648 | * Get the starting Logical Block Address and check that it's | |
649 | * not too big. | |
650 | */ | |
0a6a717c | 651 | if (common->cmnd[0] == READ_6) |
8ea864cf | 652 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 653 | else { |
8ea864cf | 654 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 655 | |
b73af61e MN |
656 | /* |
657 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a | 658 | * cache) and FUA (Force Unit Access = don't read from the |
b73af61e MN |
659 | * cache), but we don't implement them. |
660 | */ | |
8ea864cf | 661 | if ((common->cmnd[1] & ~0x18) != 0) { |
d5e2b67a MN |
662 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
663 | return -EINVAL; | |
664 | } | |
665 | } | |
666 | if (lba >= curlun->num_sectors) { | |
667 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
668 | return -EINVAL; | |
669 | } | |
3f565a36 | 670 | file_offset = ((loff_t) lba) << curlun->blkbits; |
d5e2b67a MN |
671 | |
672 | /* Carry out the file reads */ | |
8ea864cf | 673 | amount_left = common->data_size_from_cmnd; |
d5e2b67a | 674 | if (unlikely(amount_left == 0)) |
d26a6aa0 | 675 | return -EIO; /* No default reply */ |
d5e2b67a MN |
676 | |
677 | for (;;) { | |
b73af61e MN |
678 | /* |
679 | * Figure out how much we need to read: | |
d5e2b67a MN |
680 | * Try to read the remaining amount. |
681 | * But don't read more than the buffer size. | |
682 | * And don't try to read past the end of the file. | |
b73af61e | 683 | */ |
93bcf12e | 684 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
685 | amount = min((loff_t)amount, |
686 | curlun->file_length - file_offset); | |
d5e2b67a MN |
687 | |
688 | /* Wait for the next buffer to become available */ | |
8ea864cf | 689 | bh = common->next_buffhd_to_fill; |
d5e2b67a | 690 | while (bh->state != BUF_STATE_EMPTY) { |
2cf93bea | 691 | rc = sleep_thread(common, false); |
d5e2b67a MN |
692 | if (rc) |
693 | return rc; | |
694 | } | |
695 | ||
b73af61e MN |
696 | /* |
697 | * If we were asked to read past the end of file, | |
698 | * end with an empty buffer. | |
699 | */ | |
d5e2b67a MN |
700 | if (amount == 0) { |
701 | curlun->sense_data = | |
702 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
703 | curlun->sense_data_info = |
704 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
705 | curlun->info_valid = 1; |
706 | bh->inreq->length = 0; | |
707 | bh->state = BUF_STATE_FULL; | |
708 | break; | |
709 | } | |
710 | ||
711 | /* Perform the read */ | |
712 | file_offset_tmp = file_offset; | |
713 | nread = vfs_read(curlun->filp, | |
b73af61e MN |
714 | (char __user *)bh->buf, |
715 | amount, &file_offset_tmp); | |
d5e2b67a | 716 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, |
b73af61e | 717 | (unsigned long long)file_offset, (int)nread); |
d5e2b67a MN |
718 | if (signal_pending(current)) |
719 | return -EINTR; | |
720 | ||
721 | if (nread < 0) { | |
b73af61e | 722 | LDBG(curlun, "error in file read: %d\n", (int)nread); |
d5e2b67a MN |
723 | nread = 0; |
724 | } else if (nread < amount) { | |
725 | LDBG(curlun, "partial file read: %d/%u\n", | |
b73af61e | 726 | (int)nread, amount); |
3f565a36 | 727 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
728 | } |
729 | file_offset += nread; | |
730 | amount_left -= nread; | |
8ea864cf | 731 | common->residue -= nread; |
04eee25b AS |
732 | |
733 | /* | |
734 | * Except at the end of the transfer, nread will be | |
735 | * equal to the buffer size, which is divisible by the | |
736 | * bulk-in maxpacket size. | |
737 | */ | |
d5e2b67a MN |
738 | bh->inreq->length = nread; |
739 | bh->state = BUF_STATE_FULL; | |
740 | ||
741 | /* If an error occurred, report it and its position */ | |
742 | if (nread < amount) { | |
743 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
744 | curlun->sense_data_info = |
745 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
746 | curlun->info_valid = 1; |
747 | break; | |
748 | } | |
749 | ||
750 | if (amount_left == 0) | |
d26a6aa0 | 751 | break; /* No more left to read */ |
d5e2b67a MN |
752 | |
753 | /* Send this buffer and go read some more */ | |
754 | bh->inreq->zero = 0; | |
fe52f792 MN |
755 | if (!start_in_transfer(common, bh)) |
756 | /* Don't know what to do if common->fsg is NULL */ | |
8ea864cf MN |
757 | return -EIO; |
758 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
759 | } |
760 | ||
d26a6aa0 | 761 | return -EIO; /* No default reply */ |
d5e2b67a MN |
762 | } |
763 | ||
764 | ||
765 | /*-------------------------------------------------------------------------*/ | |
766 | ||
8ea864cf | 767 | static int do_write(struct fsg_common *common) |
d5e2b67a | 768 | { |
8ea864cf | 769 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
770 | u32 lba; |
771 | struct fsg_buffhd *bh; | |
772 | int get_some_more; | |
773 | u32 amount_left_to_req, amount_left_to_write; | |
774 | loff_t usb_offset, file_offset, file_offset_tmp; | |
775 | unsigned int amount; | |
d5e2b67a MN |
776 | ssize_t nwritten; |
777 | int rc; | |
778 | ||
779 | if (curlun->ro) { | |
780 | curlun->sense_data = SS_WRITE_PROTECTED; | |
781 | return -EINVAL; | |
782 | } | |
783 | spin_lock(&curlun->filp->f_lock); | |
d26a6aa0 | 784 | curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */ |
d5e2b67a MN |
785 | spin_unlock(&curlun->filp->f_lock); |
786 | ||
b73af61e MN |
787 | /* |
788 | * Get the starting Logical Block Address and check that it's | |
789 | * not too big | |
790 | */ | |
0a6a717c | 791 | if (common->cmnd[0] == WRITE_6) |
8ea864cf | 792 | lba = get_unaligned_be24(&common->cmnd[1]); |
d5e2b67a | 793 | else { |
8ea864cf | 794 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a | 795 | |
b73af61e MN |
796 | /* |
797 | * We allow DPO (Disable Page Out = don't save data in the | |
d5e2b67a MN |
798 | * cache) and FUA (Force Unit Access = write directly to the |
799 | * medium). We don't implement DPO; we implement FUA by | |
b73af61e MN |
800 | * performing synchronous output. |
801 | */ | |
8ea864cf | 802 | if (common->cmnd[1] & ~0x18) { |
d5e2b67a MN |
803 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
804 | return -EINVAL; | |
805 | } | |
9cfe745e | 806 | if (!curlun->nofua && (common->cmnd[1] & 0x08)) { /* FUA */ |
d5e2b67a MN |
807 | spin_lock(&curlun->filp->f_lock); |
808 | curlun->filp->f_flags |= O_SYNC; | |
809 | spin_unlock(&curlun->filp->f_lock); | |
810 | } | |
811 | } | |
812 | if (lba >= curlun->num_sectors) { | |
813 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
814 | return -EINVAL; | |
815 | } | |
816 | ||
817 | /* Carry out the file writes */ | |
818 | get_some_more = 1; | |
3f565a36 | 819 | file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits; |
8ea864cf MN |
820 | amount_left_to_req = common->data_size_from_cmnd; |
821 | amount_left_to_write = common->data_size_from_cmnd; | |
d5e2b67a MN |
822 | |
823 | while (amount_left_to_write > 0) { | |
824 | ||
825 | /* Queue a request for more data from the host */ | |
8ea864cf | 826 | bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
827 | if (bh->state == BUF_STATE_EMPTY && get_some_more) { |
828 | ||
b73af61e MN |
829 | /* |
830 | * Figure out how much we want to get: | |
04eee25b AS |
831 | * Try to get the remaining amount, |
832 | * but not more than the buffer size. | |
b73af61e | 833 | */ |
93bcf12e | 834 | amount = min(amount_left_to_req, FSG_BUFLEN); |
04eee25b AS |
835 | |
836 | /* Beyond the end of the backing file? */ | |
837 | if (usb_offset >= curlun->file_length) { | |
d5e2b67a MN |
838 | get_some_more = 0; |
839 | curlun->sense_data = | |
840 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
841 | curlun->sense_data_info = |
842 | usb_offset >> curlun->blkbits; | |
d5e2b67a MN |
843 | curlun->info_valid = 1; |
844 | continue; | |
845 | } | |
d5e2b67a MN |
846 | |
847 | /* Get the next buffer */ | |
848 | usb_offset += amount; | |
8ea864cf | 849 | common->usb_amount_left -= amount; |
d5e2b67a MN |
850 | amount_left_to_req -= amount; |
851 | if (amount_left_to_req == 0) | |
852 | get_some_more = 0; | |
853 | ||
b73af61e | 854 | /* |
04eee25b AS |
855 | * Except at the end of the transfer, amount will be |
856 | * equal to the buffer size, which is divisible by | |
857 | * the bulk-out maxpacket size. | |
b73af61e | 858 | */ |
fe696765 | 859 | set_bulk_out_req_length(common, bh, amount); |
fe52f792 | 860 | if (!start_out_transfer(common, bh)) |
b73af61e | 861 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf MN |
862 | return -EIO; |
863 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a MN |
864 | continue; |
865 | } | |
866 | ||
867 | /* Write the received data to the backing file */ | |
8ea864cf | 868 | bh = common->next_buffhd_to_drain; |
d5e2b67a | 869 | if (bh->state == BUF_STATE_EMPTY && !get_some_more) |
d26a6aa0 | 870 | break; /* We stopped early */ |
d5e2b67a MN |
871 | if (bh->state == BUF_STATE_FULL) { |
872 | smp_rmb(); | |
8ea864cf | 873 | common->next_buffhd_to_drain = bh->next; |
d5e2b67a MN |
874 | bh->state = BUF_STATE_EMPTY; |
875 | ||
876 | /* Did something go wrong with the transfer? */ | |
877 | if (bh->outreq->status != 0) { | |
878 | curlun->sense_data = SS_COMMUNICATION_FAILURE; | |
3f565a36 PL |
879 | curlun->sense_data_info = |
880 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
881 | curlun->info_valid = 1; |
882 | break; | |
883 | } | |
884 | ||
885 | amount = bh->outreq->actual; | |
886 | if (curlun->file_length - file_offset < amount) { | |
887 | LERROR(curlun, | |
b73af61e MN |
888 | "write %u @ %llu beyond end %llu\n", |
889 | amount, (unsigned long long)file_offset, | |
890 | (unsigned long long)curlun->file_length); | |
d5e2b67a MN |
891 | amount = curlun->file_length - file_offset; |
892 | } | |
893 | ||
fe696765 PZ |
894 | /* Don't accept excess data. The spec doesn't say |
895 | * what to do in this case. We'll ignore the error. | |
896 | */ | |
897 | amount = min(amount, bh->bulk_out_intended_length); | |
898 | ||
04eee25b AS |
899 | /* Don't write a partial block */ |
900 | amount = round_down(amount, curlun->blksize); | |
901 | if (amount == 0) | |
902 | goto empty_write; | |
903 | ||
d5e2b67a MN |
904 | /* Perform the write */ |
905 | file_offset_tmp = file_offset; | |
906 | nwritten = vfs_write(curlun->filp, | |
b73af61e MN |
907 | (char __user *)bh->buf, |
908 | amount, &file_offset_tmp); | |
d5e2b67a | 909 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, |
b73af61e | 910 | (unsigned long long)file_offset, (int)nwritten); |
d5e2b67a | 911 | if (signal_pending(current)) |
d26a6aa0 | 912 | return -EINTR; /* Interrupted! */ |
d5e2b67a MN |
913 | |
914 | if (nwritten < 0) { | |
915 | LDBG(curlun, "error in file write: %d\n", | |
b73af61e | 916 | (int)nwritten); |
d5e2b67a MN |
917 | nwritten = 0; |
918 | } else if (nwritten < amount) { | |
919 | LDBG(curlun, "partial file write: %d/%u\n", | |
b73af61e | 920 | (int)nwritten, amount); |
3f565a36 | 921 | nwritten = round_down(nwritten, curlun->blksize); |
d5e2b67a MN |
922 | } |
923 | file_offset += nwritten; | |
924 | amount_left_to_write -= nwritten; | |
8ea864cf | 925 | common->residue -= nwritten; |
d5e2b67a MN |
926 | |
927 | /* If an error occurred, report it and its position */ | |
928 | if (nwritten < amount) { | |
929 | curlun->sense_data = SS_WRITE_ERROR; | |
3f565a36 PL |
930 | curlun->sense_data_info = |
931 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
932 | curlun->info_valid = 1; |
933 | break; | |
934 | } | |
935 | ||
04eee25b | 936 | empty_write: |
d5e2b67a | 937 | /* Did the host decide to stop early? */ |
fe696765 | 938 | if (bh->outreq->actual < bh->bulk_out_intended_length) { |
8ea864cf | 939 | common->short_packet_received = 1; |
d5e2b67a MN |
940 | break; |
941 | } | |
942 | continue; | |
943 | } | |
944 | ||
945 | /* Wait for something to happen */ | |
2cf93bea | 946 | rc = sleep_thread(common, false); |
d5e2b67a MN |
947 | if (rc) |
948 | return rc; | |
949 | } | |
950 | ||
d26a6aa0 | 951 | return -EIO; /* No default reply */ |
d5e2b67a MN |
952 | } |
953 | ||
954 | ||
955 | /*-------------------------------------------------------------------------*/ | |
956 | ||
8ea864cf | 957 | static int do_synchronize_cache(struct fsg_common *common) |
d5e2b67a | 958 | { |
8ea864cf | 959 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
960 | int rc; |
961 | ||
962 | /* We ignore the requested LBA and write out all file's | |
963 | * dirty data buffers. */ | |
964 | rc = fsg_lun_fsync_sub(curlun); | |
965 | if (rc) | |
966 | curlun->sense_data = SS_WRITE_ERROR; | |
967 | return 0; | |
968 | } | |
969 | ||
970 | ||
971 | /*-------------------------------------------------------------------------*/ | |
972 | ||
973 | static void invalidate_sub(struct fsg_lun *curlun) | |
974 | { | |
975 | struct file *filp = curlun->filp; | |
496ad9aa | 976 | struct inode *inode = file_inode(filp); |
d5e2b67a MN |
977 | unsigned long rc; |
978 | ||
979 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); | |
2ecdc82e | 980 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc); |
d5e2b67a MN |
981 | } |
982 | ||
8ea864cf | 983 | static int do_verify(struct fsg_common *common) |
d5e2b67a | 984 | { |
8ea864cf | 985 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
986 | u32 lba; |
987 | u32 verification_length; | |
8ea864cf | 988 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
989 | loff_t file_offset, file_offset_tmp; |
990 | u32 amount_left; | |
991 | unsigned int amount; | |
992 | ssize_t nread; | |
993 | ||
b73af61e MN |
994 | /* |
995 | * Get the starting Logical Block Address and check that it's | |
996 | * not too big. | |
997 | */ | |
8ea864cf | 998 | lba = get_unaligned_be32(&common->cmnd[2]); |
d5e2b67a MN |
999 | if (lba >= curlun->num_sectors) { |
1000 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1001 | return -EINVAL; | |
1002 | } | |
1003 | ||
b73af61e MN |
1004 | /* |
1005 | * We allow DPO (Disable Page Out = don't save data in the | |
1006 | * cache) but we don't implement it. | |
1007 | */ | |
8ea864cf | 1008 | if (common->cmnd[1] & ~0x10) { |
d5e2b67a MN |
1009 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1010 | return -EINVAL; | |
1011 | } | |
1012 | ||
8ea864cf | 1013 | verification_length = get_unaligned_be16(&common->cmnd[7]); |
d5e2b67a | 1014 | if (unlikely(verification_length == 0)) |
d26a6aa0 | 1015 | return -EIO; /* No default reply */ |
d5e2b67a MN |
1016 | |
1017 | /* Prepare to carry out the file verify */ | |
3f565a36 PL |
1018 | amount_left = verification_length << curlun->blkbits; |
1019 | file_offset = ((loff_t) lba) << curlun->blkbits; | |
d5e2b67a MN |
1020 | |
1021 | /* Write out all the dirty buffers before invalidating them */ | |
1022 | fsg_lun_fsync_sub(curlun); | |
1023 | if (signal_pending(current)) | |
1024 | return -EINTR; | |
1025 | ||
1026 | invalidate_sub(curlun); | |
1027 | if (signal_pending(current)) | |
1028 | return -EINTR; | |
1029 | ||
1030 | /* Just try to read the requested blocks */ | |
1031 | while (amount_left > 0) { | |
b73af61e MN |
1032 | /* |
1033 | * Figure out how much we need to read: | |
d5e2b67a MN |
1034 | * Try to read the remaining amount, but not more than |
1035 | * the buffer size. | |
1036 | * And don't try to read past the end of the file. | |
b73af61e | 1037 | */ |
93bcf12e | 1038 | amount = min(amount_left, FSG_BUFLEN); |
b73af61e MN |
1039 | amount = min((loff_t)amount, |
1040 | curlun->file_length - file_offset); | |
d5e2b67a MN |
1041 | if (amount == 0) { |
1042 | curlun->sense_data = | |
1043 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
3f565a36 PL |
1044 | curlun->sense_data_info = |
1045 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1046 | curlun->info_valid = 1; |
1047 | break; | |
1048 | } | |
1049 | ||
1050 | /* Perform the read */ | |
1051 | file_offset_tmp = file_offset; | |
1052 | nread = vfs_read(curlun->filp, | |
1053 | (char __user *) bh->buf, | |
1054 | amount, &file_offset_tmp); | |
1055 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1056 | (unsigned long long) file_offset, | |
1057 | (int) nread); | |
1058 | if (signal_pending(current)) | |
1059 | return -EINTR; | |
1060 | ||
1061 | if (nread < 0) { | |
b73af61e | 1062 | LDBG(curlun, "error in file verify: %d\n", (int)nread); |
d5e2b67a MN |
1063 | nread = 0; |
1064 | } else if (nread < amount) { | |
1065 | LDBG(curlun, "partial file verify: %d/%u\n", | |
b73af61e | 1066 | (int)nread, amount); |
3f565a36 | 1067 | nread = round_down(nread, curlun->blksize); |
d5e2b67a MN |
1068 | } |
1069 | if (nread == 0) { | |
1070 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
3f565a36 PL |
1071 | curlun->sense_data_info = |
1072 | file_offset >> curlun->blkbits; | |
d5e2b67a MN |
1073 | curlun->info_valid = 1; |
1074 | break; | |
1075 | } | |
1076 | file_offset += nread; | |
1077 | amount_left -= nread; | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | ||
1083 | /*-------------------------------------------------------------------------*/ | |
1084 | ||
8ea864cf | 1085 | static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1086 | { |
8ea864cf | 1087 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1088 | u8 *buf = (u8 *) bh->buf; |
1089 | ||
481e4929 | 1090 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1091 | common->bad_lun_okay = 1; |
d5e2b67a | 1092 | memset(buf, 0, 36); |
fddc26f5 | 1093 | buf[0] = TYPE_NO_LUN; /* Unsupported, no device-type */ |
d26a6aa0 | 1094 | buf[4] = 31; /* Additional length */ |
d5e2b67a MN |
1095 | return 36; |
1096 | } | |
1097 | ||
0a6a717c | 1098 | buf[0] = curlun->cdrom ? TYPE_ROM : TYPE_DISK; |
481e4929 | 1099 | buf[1] = curlun->removable ? 0x80 : 0; |
d26a6aa0 MN |
1100 | buf[2] = 2; /* ANSI SCSI level 2 */ |
1101 | buf[3] = 2; /* SCSI-2 INQUIRY data format */ | |
1102 | buf[4] = 31; /* Additional length */ | |
1103 | buf[5] = 0; /* No special options */ | |
481e4929 MN |
1104 | buf[6] = 0; |
1105 | buf[7] = 0; | |
6ac47090 PG |
1106 | if (curlun->inquiry_string[0]) |
1107 | memcpy(buf + 8, curlun->inquiry_string, | |
1108 | sizeof(curlun->inquiry_string)); | |
1109 | else | |
1110 | memcpy(buf + 8, common->inquiry_string, | |
1111 | sizeof(common->inquiry_string)); | |
d5e2b67a MN |
1112 | return 36; |
1113 | } | |
1114 | ||
8ea864cf | 1115 | static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1116 | { |
8ea864cf | 1117 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1118 | u8 *buf = (u8 *) bh->buf; |
1119 | u32 sd, sdinfo; | |
1120 | int valid; | |
1121 | ||
1122 | /* | |
1123 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): | |
1124 | * | |
1125 | * If a REQUEST SENSE command is received from an initiator | |
1126 | * with a pending unit attention condition (before the target | |
1127 | * generates the contingent allegiance condition), then the | |
1128 | * target shall either: | |
1129 | * a) report any pending sense data and preserve the unit | |
1130 | * attention condition on the logical unit, or, | |
1131 | * b) report the unit attention condition, may discard any | |
1132 | * pending sense data, and clear the unit attention | |
1133 | * condition on the logical unit for that initiator. | |
1134 | * | |
1135 | * FSG normally uses option a); enable this code to use option b). | |
1136 | */ | |
1137 | #if 0 | |
1138 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { | |
1139 | curlun->sense_data = curlun->unit_attention_data; | |
1140 | curlun->unit_attention_data = SS_NO_SENSE; | |
1141 | } | |
1142 | #endif | |
1143 | ||
d26a6aa0 | 1144 | if (!curlun) { /* Unsupported LUNs are okay */ |
8ea864cf | 1145 | common->bad_lun_okay = 1; |
d5e2b67a MN |
1146 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
1147 | sdinfo = 0; | |
1148 | valid = 0; | |
1149 | } else { | |
1150 | sd = curlun->sense_data; | |
1151 | sdinfo = curlun->sense_data_info; | |
1152 | valid = curlun->info_valid << 7; | |
1153 | curlun->sense_data = SS_NO_SENSE; | |
1154 | curlun->sense_data_info = 0; | |
1155 | curlun->info_valid = 0; | |
1156 | } | |
1157 | ||
1158 | memset(buf, 0, 18); | |
d26a6aa0 | 1159 | buf[0] = valid | 0x70; /* Valid, current error */ |
d5e2b67a MN |
1160 | buf[2] = SK(sd); |
1161 | put_unaligned_be32(sdinfo, &buf[3]); /* Sense information */ | |
d26a6aa0 | 1162 | buf[7] = 18 - 8; /* Additional sense length */ |
d5e2b67a MN |
1163 | buf[12] = ASC(sd); |
1164 | buf[13] = ASCQ(sd); | |
1165 | return 18; | |
1166 | } | |
1167 | ||
8ea864cf | 1168 | static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1169 | { |
8ea864cf MN |
1170 | struct fsg_lun *curlun = common->curlun; |
1171 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
1172 | int pmi = common->cmnd[8]; | |
b73af61e | 1173 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a MN |
1174 | |
1175 | /* Check the PMI and LBA fields */ | |
1176 | if (pmi > 1 || (pmi == 0 && lba != 0)) { | |
1177 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1178 | return -EINVAL; | |
1179 | } | |
1180 | ||
1181 | put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); | |
1182 | /* Max logical block */ | |
3f565a36 | 1183 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1184 | return 8; |
1185 | } | |
1186 | ||
8ea864cf | 1187 | static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1188 | { |
8ea864cf MN |
1189 | struct fsg_lun *curlun = common->curlun; |
1190 | int msf = common->cmnd[1] & 0x02; | |
1191 | u32 lba = get_unaligned_be32(&common->cmnd[2]); | |
b73af61e | 1192 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1193 | |
8ea864cf | 1194 | if (common->cmnd[1] & ~0x02) { /* Mask away MSF */ |
d5e2b67a MN |
1195 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1196 | return -EINVAL; | |
1197 | } | |
1198 | if (lba >= curlun->num_sectors) { | |
1199 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1200 | return -EINVAL; | |
1201 | } | |
1202 | ||
1203 | memset(buf, 0, 8); | |
1204 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ | |
1205 | store_cdrom_address(&buf[4], msf, lba); | |
1206 | return 8; | |
1207 | } | |
1208 | ||
8ea864cf | 1209 | static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1210 | { |
8ea864cf MN |
1211 | struct fsg_lun *curlun = common->curlun; |
1212 | int msf = common->cmnd[1] & 0x02; | |
1213 | int start_track = common->cmnd[6]; | |
b73af61e | 1214 | u8 *buf = (u8 *)bh->buf; |
d5e2b67a | 1215 | |
8ea864cf | 1216 | if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ |
d5e2b67a MN |
1217 | start_track > 1) { |
1218 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1219 | return -EINVAL; | |
1220 | } | |
1221 | ||
1222 | memset(buf, 0, 20); | |
1223 | buf[1] = (20-2); /* TOC data length */ | |
1224 | buf[2] = 1; /* First track number */ | |
1225 | buf[3] = 1; /* Last track number */ | |
1226 | buf[5] = 0x16; /* Data track, copying allowed */ | |
1227 | buf[6] = 0x01; /* Only track is number 1 */ | |
1228 | store_cdrom_address(&buf[8], msf, 0); | |
1229 | ||
1230 | buf[13] = 0x16; /* Lead-out track is data */ | |
1231 | buf[14] = 0xAA; /* Lead-out track number */ | |
1232 | store_cdrom_address(&buf[16], msf, curlun->num_sectors); | |
1233 | return 20; | |
1234 | } | |
1235 | ||
8ea864cf | 1236 | static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1237 | { |
8ea864cf MN |
1238 | struct fsg_lun *curlun = common->curlun; |
1239 | int mscmnd = common->cmnd[0]; | |
d5e2b67a MN |
1240 | u8 *buf = (u8 *) bh->buf; |
1241 | u8 *buf0 = buf; | |
1242 | int pc, page_code; | |
1243 | int changeable_values, all_pages; | |
1244 | int valid_page = 0; | |
1245 | int len, limit; | |
1246 | ||
8ea864cf | 1247 | if ((common->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ |
d5e2b67a MN |
1248 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1249 | return -EINVAL; | |
1250 | } | |
8ea864cf MN |
1251 | pc = common->cmnd[2] >> 6; |
1252 | page_code = common->cmnd[2] & 0x3f; | |
d5e2b67a MN |
1253 | if (pc == 3) { |
1254 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; | |
1255 | return -EINVAL; | |
1256 | } | |
1257 | changeable_values = (pc == 1); | |
1258 | all_pages = (page_code == 0x3f); | |
1259 | ||
b73af61e MN |
1260 | /* |
1261 | * Write the mode parameter header. Fixed values are: default | |
d5e2b67a MN |
1262 | * medium type, no cache control (DPOFUA), and no block descriptors. |
1263 | * The only variable value is the WriteProtect bit. We will fill in | |
b73af61e MN |
1264 | * the mode data length later. |
1265 | */ | |
d5e2b67a | 1266 | memset(buf, 0, 8); |
0a6a717c | 1267 | if (mscmnd == MODE_SENSE) { |
d26a6aa0 | 1268 | buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a MN |
1269 | buf += 4; |
1270 | limit = 255; | |
0a6a717c | 1271 | } else { /* MODE_SENSE_10 */ |
d26a6aa0 | 1272 | buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
d5e2b67a | 1273 | buf += 8; |
d26a6aa0 | 1274 | limit = 65535; /* Should really be FSG_BUFLEN */ |
d5e2b67a MN |
1275 | } |
1276 | ||
1277 | /* No block descriptors */ | |
1278 | ||
b73af61e MN |
1279 | /* |
1280 | * The mode pages, in numerical order. The only page we support | |
1281 | * is the Caching page. | |
1282 | */ | |
d5e2b67a MN |
1283 | if (page_code == 0x08 || all_pages) { |
1284 | valid_page = 1; | |
d26a6aa0 MN |
1285 | buf[0] = 0x08; /* Page code */ |
1286 | buf[1] = 10; /* Page length */ | |
1287 | memset(buf+2, 0, 10); /* None of the fields are changeable */ | |
d5e2b67a MN |
1288 | |
1289 | if (!changeable_values) { | |
d26a6aa0 MN |
1290 | buf[2] = 0x04; /* Write cache enable, */ |
1291 | /* Read cache not disabled */ | |
1292 | /* No cache retention priorities */ | |
d5e2b67a MN |
1293 | put_unaligned_be16(0xffff, &buf[4]); |
1294 | /* Don't disable prefetch */ | |
1295 | /* Minimum prefetch = 0 */ | |
1296 | put_unaligned_be16(0xffff, &buf[8]); | |
1297 | /* Maximum prefetch */ | |
1298 | put_unaligned_be16(0xffff, &buf[10]); | |
1299 | /* Maximum prefetch ceiling */ | |
1300 | } | |
1301 | buf += 12; | |
1302 | } | |
1303 | ||
b73af61e MN |
1304 | /* |
1305 | * Check that a valid page was requested and the mode data length | |
1306 | * isn't too long. | |
1307 | */ | |
d5e2b67a MN |
1308 | len = buf - buf0; |
1309 | if (!valid_page || len > limit) { | |
1310 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1311 | return -EINVAL; | |
1312 | } | |
1313 | ||
1314 | /* Store the mode data length */ | |
0a6a717c | 1315 | if (mscmnd == MODE_SENSE) |
d5e2b67a MN |
1316 | buf0[0] = len - 1; |
1317 | else | |
1318 | put_unaligned_be16(len - 2, buf0); | |
1319 | return len; | |
1320 | } | |
1321 | ||
8ea864cf | 1322 | static int do_start_stop(struct fsg_common *common) |
d5e2b67a | 1323 | { |
31436a1a FC |
1324 | struct fsg_lun *curlun = common->curlun; |
1325 | int loej, start; | |
1326 | ||
1327 | if (!curlun) { | |
481e4929 | 1328 | return -EINVAL; |
31436a1a FC |
1329 | } else if (!curlun->removable) { |
1330 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a | 1331 | return -EINVAL; |
8876f5e7 MN |
1332 | } else if ((common->cmnd[1] & ~0x01) != 0 || /* Mask away Immed */ |
1333 | (common->cmnd[4] & ~0x03) != 0) { /* Mask LoEj, Start */ | |
31436a1a FC |
1334 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1335 | return -EINVAL; | |
1336 | } | |
1337 | ||
8876f5e7 MN |
1338 | loej = common->cmnd[4] & 0x02; |
1339 | start = common->cmnd[4] & 0x01; | |
31436a1a | 1340 | |
b73af61e MN |
1341 | /* |
1342 | * Our emulation doesn't support mounting; the medium is | |
1343 | * available for use as soon as it is loaded. | |
1344 | */ | |
8876f5e7 | 1345 | if (start) { |
31436a1a FC |
1346 | if (!fsg_lun_is_open(curlun)) { |
1347 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1348 | return -EINVAL; | |
1349 | } | |
8876f5e7 | 1350 | return 0; |
31436a1a | 1351 | } |
8876f5e7 MN |
1352 | |
1353 | /* Are we allowed to unload the media? */ | |
1354 | if (curlun->prevent_medium_removal) { | |
1355 | LDBG(curlun, "unload attempt prevented\n"); | |
1356 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; | |
1357 | return -EINVAL; | |
1358 | } | |
1359 | ||
1360 | if (!loej) | |
1361 | return 0; | |
1362 | ||
8876f5e7 MN |
1363 | up_read(&common->filesem); |
1364 | down_write(&common->filesem); | |
1365 | fsg_lun_close(curlun); | |
1366 | up_write(&common->filesem); | |
1367 | down_read(&common->filesem); | |
1368 | ||
2b508002 | 1369 | return 0; |
d5e2b67a MN |
1370 | } |
1371 | ||
8ea864cf | 1372 | static int do_prevent_allow(struct fsg_common *common) |
d5e2b67a | 1373 | { |
8ea864cf | 1374 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1375 | int prevent; |
1376 | ||
8ea864cf | 1377 | if (!common->curlun) { |
481e4929 | 1378 | return -EINVAL; |
8ea864cf MN |
1379 | } else if (!common->curlun->removable) { |
1380 | common->curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1381 | return -EINVAL; |
1382 | } | |
1383 | ||
8ea864cf MN |
1384 | prevent = common->cmnd[4] & 0x01; |
1385 | if ((common->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */ | |
d5e2b67a MN |
1386 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
1387 | return -EINVAL; | |
1388 | } | |
1389 | ||
1390 | if (curlun->prevent_medium_removal && !prevent) | |
1391 | fsg_lun_fsync_sub(curlun); | |
1392 | curlun->prevent_medium_removal = prevent; | |
1393 | return 0; | |
1394 | } | |
1395 | ||
8ea864cf | 1396 | static int do_read_format_capacities(struct fsg_common *common, |
d5e2b67a MN |
1397 | struct fsg_buffhd *bh) |
1398 | { | |
8ea864cf | 1399 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1400 | u8 *buf = (u8 *) bh->buf; |
1401 | ||
1402 | buf[0] = buf[1] = buf[2] = 0; | |
d26a6aa0 | 1403 | buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ |
d5e2b67a MN |
1404 | buf += 4; |
1405 | ||
1406 | put_unaligned_be32(curlun->num_sectors, &buf[0]); | |
1407 | /* Number of blocks */ | |
3f565a36 | 1408 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
d5e2b67a MN |
1409 | buf[4] = 0x02; /* Current capacity */ |
1410 | return 12; | |
1411 | } | |
1412 | ||
8ea864cf | 1413 | static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh) |
d5e2b67a | 1414 | { |
8ea864cf | 1415 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a MN |
1416 | |
1417 | /* We don't support MODE SELECT */ | |
8ea864cf MN |
1418 | if (curlun) |
1419 | curlun->sense_data = SS_INVALID_COMMAND; | |
d5e2b67a MN |
1420 | return -EINVAL; |
1421 | } | |
1422 | ||
1423 | ||
1424 | /*-------------------------------------------------------------------------*/ | |
1425 | ||
1426 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) | |
1427 | { | |
1428 | int rc; | |
1429 | ||
1430 | rc = fsg_set_halt(fsg, fsg->bulk_in); | |
1431 | if (rc == -EAGAIN) | |
1432 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); | |
1433 | while (rc != 0) { | |
1434 | if (rc != -EAGAIN) { | |
1435 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); | |
1436 | rc = 0; | |
1437 | break; | |
1438 | } | |
1439 | ||
1440 | /* Wait for a short time and then try again */ | |
1441 | if (msleep_interruptible(100) != 0) | |
1442 | return -EINTR; | |
1443 | rc = usb_ep_set_halt(fsg->bulk_in); | |
1444 | } | |
1445 | return rc; | |
1446 | } | |
1447 | ||
1448 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) | |
1449 | { | |
1450 | int rc; | |
1451 | ||
1452 | DBG(fsg, "bulk-in set wedge\n"); | |
1453 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1454 | if (rc == -EAGAIN) | |
1455 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); | |
1456 | while (rc != 0) { | |
1457 | if (rc != -EAGAIN) { | |
1458 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); | |
1459 | rc = 0; | |
1460 | break; | |
1461 | } | |
1462 | ||
1463 | /* Wait for a short time and then try again */ | |
1464 | if (msleep_interruptible(100) != 0) | |
1465 | return -EINTR; | |
1466 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1467 | } | |
1468 | return rc; | |
1469 | } | |
1470 | ||
8ea864cf | 1471 | static int throw_away_data(struct fsg_common *common) |
d5e2b67a MN |
1472 | { |
1473 | struct fsg_buffhd *bh; | |
1474 | u32 amount; | |
1475 | int rc; | |
1476 | ||
8ea864cf MN |
1477 | for (bh = common->next_buffhd_to_drain; |
1478 | bh->state != BUF_STATE_EMPTY || common->usb_amount_left > 0; | |
1479 | bh = common->next_buffhd_to_drain) { | |
d5e2b67a MN |
1480 | |
1481 | /* Throw away the data in a filled buffer */ | |
1482 | if (bh->state == BUF_STATE_FULL) { | |
1483 | smp_rmb(); | |
1484 | bh->state = BUF_STATE_EMPTY; | |
8ea864cf | 1485 | common->next_buffhd_to_drain = bh->next; |
d5e2b67a MN |
1486 | |
1487 | /* A short packet or an error ends everything */ | |
fe696765 | 1488 | if (bh->outreq->actual < bh->bulk_out_intended_length || |
b73af61e | 1489 | bh->outreq->status != 0) { |
8ea864cf MN |
1490 | raise_exception(common, |
1491 | FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a MN |
1492 | return -EINTR; |
1493 | } | |
1494 | continue; | |
1495 | } | |
1496 | ||
1497 | /* Try to submit another request if we need one */ | |
8ea864cf MN |
1498 | bh = common->next_buffhd_to_fill; |
1499 | if (bh->state == BUF_STATE_EMPTY | |
1500 | && common->usb_amount_left > 0) { | |
1501 | amount = min(common->usb_amount_left, FSG_BUFLEN); | |
d5e2b67a | 1502 | |
b73af61e | 1503 | /* |
04eee25b AS |
1504 | * Except at the end of the transfer, amount will be |
1505 | * equal to the buffer size, which is divisible by | |
b73af61e MN |
1506 | * the bulk-out maxpacket size. |
1507 | */ | |
fe696765 | 1508 | set_bulk_out_req_length(common, bh, amount); |
fe52f792 | 1509 | if (!start_out_transfer(common, bh)) |
b73af61e | 1510 | /* Dunno what to do if common->fsg is NULL */ |
8ea864cf MN |
1511 | return -EIO; |
1512 | common->next_buffhd_to_fill = bh->next; | |
1513 | common->usb_amount_left -= amount; | |
d5e2b67a MN |
1514 | continue; |
1515 | } | |
1516 | ||
1517 | /* Otherwise wait for something to happen */ | |
2cf93bea | 1518 | rc = sleep_thread(common, true); |
d5e2b67a MN |
1519 | if (rc) |
1520 | return rc; | |
1521 | } | |
1522 | return 0; | |
1523 | } | |
1524 | ||
8ea864cf | 1525 | static int finish_reply(struct fsg_common *common) |
d5e2b67a | 1526 | { |
8ea864cf | 1527 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
d5e2b67a MN |
1528 | int rc = 0; |
1529 | ||
8ea864cf | 1530 | switch (common->data_dir) { |
d5e2b67a | 1531 | case DATA_DIR_NONE: |
d26a6aa0 | 1532 | break; /* Nothing to send */ |
d5e2b67a | 1533 | |
b73af61e MN |
1534 | /* |
1535 | * If we don't know whether the host wants to read or write, | |
d5e2b67a MN |
1536 | * this must be CB or CBI with an unknown command. We mustn't |
1537 | * try to send or receive any data. So stall both bulk pipes | |
b73af61e MN |
1538 | * if we can and wait for a reset. |
1539 | */ | |
d5e2b67a | 1540 | case DATA_DIR_UNKNOWN: |
8ea864cf MN |
1541 | if (!common->can_stall) { |
1542 | /* Nothing */ | |
1543 | } else if (fsg_is_set(common)) { | |
1544 | fsg_set_halt(common->fsg, common->fsg->bulk_out); | |
1545 | rc = halt_bulk_in_endpoint(common->fsg); | |
1546 | } else { | |
1547 | /* Don't know what to do if common->fsg is NULL */ | |
1548 | rc = -EIO; | |
d5e2b67a MN |
1549 | } |
1550 | break; | |
1551 | ||
1552 | /* All but the last buffer of data must have already been sent */ | |
1553 | case DATA_DIR_TO_HOST: | |
8ea864cf | 1554 | if (common->data_size == 0) { |
93bcf12e | 1555 | /* Nothing to send */ |
d5e2b67a | 1556 | |
ee81b3e0 AS |
1557 | /* Don't know what to do if common->fsg is NULL */ |
1558 | } else if (!fsg_is_set(common)) { | |
1559 | rc = -EIO; | |
1560 | ||
d5e2b67a | 1561 | /* If there's no residue, simply send the last buffer */ |
8ea864cf | 1562 | } else if (common->residue == 0) { |
d5e2b67a | 1563 | bh->inreq->zero = 0; |
fe52f792 | 1564 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1565 | return -EIO; |
1566 | common->next_buffhd_to_fill = bh->next; | |
d5e2b67a | 1567 | |
b73af61e | 1568 | /* |
ee81b3e0 AS |
1569 | * For Bulk-only, mark the end of the data with a short |
1570 | * packet. If we are allowed to stall, halt the bulk-in | |
1571 | * endpoint. (Note: This violates the Bulk-Only Transport | |
1572 | * specification, which requires us to pad the data if we | |
1573 | * don't halt the endpoint. Presumably nobody will mind.) | |
b73af61e | 1574 | */ |
ee81b3e0 | 1575 | } else { |
93bcf12e | 1576 | bh->inreq->zero = 1; |
fe52f792 | 1577 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1578 | rc = -EIO; |
1579 | common->next_buffhd_to_fill = bh->next; | |
ee81b3e0 | 1580 | if (common->can_stall) |
8ea864cf | 1581 | rc = halt_bulk_in_endpoint(common->fsg); |
d5e2b67a MN |
1582 | } |
1583 | break; | |
1584 | ||
b73af61e MN |
1585 | /* |
1586 | * We have processed all we want from the data the host has sent. | |
1587 | * There may still be outstanding bulk-out requests. | |
1588 | */ | |
d5e2b67a | 1589 | case DATA_DIR_FROM_HOST: |
8ea864cf | 1590 | if (common->residue == 0) { |
d26a6aa0 | 1591 | /* Nothing to receive */ |
d5e2b67a MN |
1592 | |
1593 | /* Did the host stop sending unexpectedly early? */ | |
8ea864cf MN |
1594 | } else if (common->short_packet_received) { |
1595 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1596 | rc = -EINTR; |
d5e2b67a | 1597 | |
b73af61e MN |
1598 | /* |
1599 | * We haven't processed all the incoming data. Even though | |
d5e2b67a MN |
1600 | * we may be allowed to stall, doing so would cause a race. |
1601 | * The controller may already have ACK'ed all the remaining | |
1602 | * bulk-out packets, in which case the host wouldn't see a | |
1603 | * STALL. Not realizing the endpoint was halted, it wouldn't | |
b73af61e MN |
1604 | * clear the halt -- leading to problems later on. |
1605 | */ | |
d5e2b67a | 1606 | #if 0 |
8ea864cf MN |
1607 | } else if (common->can_stall) { |
1608 | if (fsg_is_set(common)) | |
1609 | fsg_set_halt(common->fsg, | |
1610 | common->fsg->bulk_out); | |
1611 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); | |
d5e2b67a | 1612 | rc = -EINTR; |
d5e2b67a MN |
1613 | #endif |
1614 | ||
b73af61e MN |
1615 | /* |
1616 | * We can't stall. Read in the excess data and throw it | |
1617 | * all away. | |
1618 | */ | |
d26a6aa0 | 1619 | } else { |
8ea864cf | 1620 | rc = throw_away_data(common); |
d26a6aa0 | 1621 | } |
d5e2b67a MN |
1622 | break; |
1623 | } | |
1624 | return rc; | |
1625 | } | |
1626 | ||
8ea864cf | 1627 | static int send_status(struct fsg_common *common) |
d5e2b67a | 1628 | { |
8ea864cf | 1629 | struct fsg_lun *curlun = common->curlun; |
d5e2b67a | 1630 | struct fsg_buffhd *bh; |
93bcf12e | 1631 | struct bulk_cs_wrap *csw; |
d5e2b67a | 1632 | int rc; |
775dafdc | 1633 | u8 status = US_BULK_STAT_OK; |
d5e2b67a MN |
1634 | u32 sd, sdinfo = 0; |
1635 | ||
1636 | /* Wait for the next buffer to become available */ | |
8ea864cf | 1637 | bh = common->next_buffhd_to_fill; |
d5e2b67a | 1638 | while (bh->state != BUF_STATE_EMPTY) { |
2cf93bea | 1639 | rc = sleep_thread(common, true); |
d5e2b67a MN |
1640 | if (rc) |
1641 | return rc; | |
1642 | } | |
1643 | ||
1644 | if (curlun) { | |
1645 | sd = curlun->sense_data; | |
1646 | sdinfo = curlun->sense_data_info; | |
8ea864cf | 1647 | } else if (common->bad_lun_okay) |
d5e2b67a MN |
1648 | sd = SS_NO_SENSE; |
1649 | else | |
1650 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
1651 | ||
8ea864cf MN |
1652 | if (common->phase_error) { |
1653 | DBG(common, "sending phase-error status\n"); | |
775dafdc | 1654 | status = US_BULK_STAT_PHASE; |
d5e2b67a MN |
1655 | sd = SS_INVALID_COMMAND; |
1656 | } else if (sd != SS_NO_SENSE) { | |
8ea864cf | 1657 | DBG(common, "sending command-failure status\n"); |
775dafdc | 1658 | status = US_BULK_STAT_FAIL; |
8ea864cf | 1659 | VDBG(common, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" |
d5e2b67a MN |
1660 | " info x%x\n", |
1661 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); | |
1662 | } | |
1663 | ||
93bcf12e | 1664 | /* Store and send the Bulk-only CSW */ |
d26a6aa0 | 1665 | csw = (void *)bh->buf; |
d5e2b67a | 1666 | |
775dafdc | 1667 | csw->Signature = cpu_to_le32(US_BULK_CS_SIGN); |
8ea864cf MN |
1668 | csw->Tag = common->tag; |
1669 | csw->Residue = cpu_to_le32(common->residue); | |
93bcf12e | 1670 | csw->Status = status; |
d5e2b67a | 1671 | |
775dafdc | 1672 | bh->inreq->length = US_BULK_CS_WRAP_LEN; |
93bcf12e | 1673 | bh->inreq->zero = 0; |
fe52f792 | 1674 | if (!start_in_transfer(common, bh)) |
8ea864cf MN |
1675 | /* Don't know what to do if common->fsg is NULL */ |
1676 | return -EIO; | |
d5e2b67a | 1677 | |
8ea864cf | 1678 | common->next_buffhd_to_fill = bh->next; |
d5e2b67a MN |
1679 | return 0; |
1680 | } | |
1681 | ||
1682 | ||
1683 | /*-------------------------------------------------------------------------*/ | |
1684 | ||
b73af61e MN |
1685 | /* |
1686 | * Check whether the command is properly formed and whether its data size | |
1687 | * and direction agree with the values we already have. | |
1688 | */ | |
8ea864cf | 1689 | static int check_command(struct fsg_common *common, int cmnd_size, |
b73af61e MN |
1690 | enum data_direction data_dir, unsigned int mask, |
1691 | int needs_medium, const char *name) | |
d5e2b67a MN |
1692 | { |
1693 | int i; | |
98f3a1b9 | 1694 | unsigned int lun = common->cmnd[1] >> 5; |
d5e2b67a MN |
1695 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; |
1696 | char hdlen[20]; | |
1697 | struct fsg_lun *curlun; | |
1698 | ||
d5e2b67a | 1699 | hdlen[0] = 0; |
8ea864cf MN |
1700 | if (common->data_dir != DATA_DIR_UNKNOWN) |
1701 | sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir], | |
b73af61e | 1702 | common->data_size); |
8ea864cf | 1703 | VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", |
d26a6aa0 | 1704 | name, cmnd_size, dirletter[(int) data_dir], |
8ea864cf | 1705 | common->data_size_from_cmnd, common->cmnd_size, hdlen); |
d5e2b67a | 1706 | |
b73af61e MN |
1707 | /* |
1708 | * We can't reply at all until we know the correct data direction | |
1709 | * and size. | |
1710 | */ | |
8ea864cf | 1711 | if (common->data_size_from_cmnd == 0) |
d5e2b67a | 1712 | data_dir = DATA_DIR_NONE; |
8ea864cf | 1713 | if (common->data_size < common->data_size_from_cmnd) { |
b73af61e MN |
1714 | /* |
1715 | * Host data size < Device data size is a phase error. | |
8ea864cf | 1716 | * Carry out the command, but only transfer as much as |
b73af61e MN |
1717 | * we are allowed. |
1718 | */ | |
8ea864cf MN |
1719 | common->data_size_from_cmnd = common->data_size; |
1720 | common->phase_error = 1; | |
d5e2b67a | 1721 | } |
8ea864cf MN |
1722 | common->residue = common->data_size; |
1723 | common->usb_amount_left = common->data_size; | |
d5e2b67a MN |
1724 | |
1725 | /* Conflicting data directions is a phase error */ | |
b73af61e | 1726 | if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) { |
8ea864cf | 1727 | common->phase_error = 1; |
d5e2b67a MN |
1728 | return -EINVAL; |
1729 | } | |
1730 | ||
1731 | /* Verify the length of the command itself */ | |
8ea864cf | 1732 | if (cmnd_size != common->cmnd_size) { |
d5e2b67a | 1733 | |
b73af61e MN |
1734 | /* |
1735 | * Special case workaround: There are plenty of buggy SCSI | |
d5e2b67a MN |
1736 | * implementations. Many have issues with cbw->Length |
1737 | * field passing a wrong command size. For those cases we | |
1738 | * always try to work around the problem by using the length | |
1739 | * sent by the host side provided it is at least as large | |
1740 | * as the correct command length. | |
1741 | * Examples of such cases would be MS-Windows, which issues | |
1742 | * REQUEST SENSE with cbw->Length == 12 where it should | |
1743 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and | |
1744 | * REQUEST SENSE with cbw->Length == 10 where it should | |
1745 | * be 6 as well. | |
1746 | */ | |
8ea864cf MN |
1747 | if (cmnd_size <= common->cmnd_size) { |
1748 | DBG(common, "%s is buggy! Expected length %d " | |
a41ae418 | 1749 | "but we got %d\n", name, |
8ea864cf MN |
1750 | cmnd_size, common->cmnd_size); |
1751 | cmnd_size = common->cmnd_size; | |
d5e2b67a | 1752 | } else { |
8ea864cf | 1753 | common->phase_error = 1; |
d5e2b67a MN |
1754 | return -EINVAL; |
1755 | } | |
1756 | } | |
1757 | ||
1758 | /* Check that the LUN values are consistent */ | |
8ea864cf | 1759 | if (common->lun != lun) |
98f3a1b9 | 1760 | DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n", |
8ea864cf | 1761 | common->lun, lun); |
d5e2b67a MN |
1762 | |
1763 | /* Check the LUN */ | |
144974e7 YL |
1764 | curlun = common->curlun; |
1765 | if (curlun) { | |
0a6a717c | 1766 | if (common->cmnd[0] != REQUEST_SENSE) { |
d5e2b67a MN |
1767 | curlun->sense_data = SS_NO_SENSE; |
1768 | curlun->sense_data_info = 0; | |
1769 | curlun->info_valid = 0; | |
1770 | } | |
1771 | } else { | |
8ea864cf | 1772 | common->bad_lun_okay = 0; |
d5e2b67a | 1773 | |
b73af61e MN |
1774 | /* |
1775 | * INQUIRY and REQUEST SENSE commands are explicitly allowed | |
1776 | * to use unsupported LUNs; all others may not. | |
1777 | */ | |
0a6a717c MN |
1778 | if (common->cmnd[0] != INQUIRY && |
1779 | common->cmnd[0] != REQUEST_SENSE) { | |
98f3a1b9 | 1780 | DBG(common, "unsupported LUN %u\n", common->lun); |
d5e2b67a MN |
1781 | return -EINVAL; |
1782 | } | |
1783 | } | |
1784 | ||
b73af61e MN |
1785 | /* |
1786 | * If a unit attention condition exists, only INQUIRY and | |
1787 | * REQUEST SENSE commands are allowed; anything else must fail. | |
1788 | */ | |
d5e2b67a | 1789 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE && |
b73af61e MN |
1790 | common->cmnd[0] != INQUIRY && |
1791 | common->cmnd[0] != REQUEST_SENSE) { | |
d5e2b67a MN |
1792 | curlun->sense_data = curlun->unit_attention_data; |
1793 | curlun->unit_attention_data = SS_NO_SENSE; | |
1794 | return -EINVAL; | |
1795 | } | |
1796 | ||
1797 | /* Check that only command bytes listed in the mask are non-zero */ | |
8ea864cf | 1798 | common->cmnd[1] &= 0x1f; /* Mask away the LUN */ |
d5e2b67a | 1799 | for (i = 1; i < cmnd_size; ++i) { |
8ea864cf | 1800 | if (common->cmnd[i] && !(mask & (1 << i))) { |
d5e2b67a MN |
1801 | if (curlun) |
1802 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1803 | return -EINVAL; | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | /* If the medium isn't mounted and the command needs to access | |
1808 | * it, return an error. */ | |
1809 | if (curlun && !fsg_lun_is_open(curlun) && needs_medium) { | |
1810 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; | |
1811 | return -EINVAL; | |
1812 | } | |
1813 | ||
1814 | return 0; | |
1815 | } | |
1816 | ||
144974e7 YL |
1817 | /* wrapper of check_command for data size in blocks handling */ |
1818 | static int check_command_size_in_blocks(struct fsg_common *common, | |
1819 | int cmnd_size, enum data_direction data_dir, | |
1820 | unsigned int mask, int needs_medium, const char *name) | |
1821 | { | |
1822 | if (common->curlun) | |
1823 | common->data_size_from_cmnd <<= common->curlun->blkbits; | |
1824 | return check_command(common, cmnd_size, data_dir, | |
1825 | mask, needs_medium, name); | |
1826 | } | |
1827 | ||
8ea864cf | 1828 | static int do_scsi_command(struct fsg_common *common) |
d5e2b67a MN |
1829 | { |
1830 | struct fsg_buffhd *bh; | |
1831 | int rc; | |
1832 | int reply = -EINVAL; | |
1833 | int i; | |
1834 | static char unknown[16]; | |
1835 | ||
8ea864cf | 1836 | dump_cdb(common); |
d5e2b67a MN |
1837 | |
1838 | /* Wait for the next buffer to become available for data or status */ | |
8ea864cf MN |
1839 | bh = common->next_buffhd_to_fill; |
1840 | common->next_buffhd_to_drain = bh; | |
d5e2b67a | 1841 | while (bh->state != BUF_STATE_EMPTY) { |
2cf93bea | 1842 | rc = sleep_thread(common, true); |
d5e2b67a MN |
1843 | if (rc) |
1844 | return rc; | |
1845 | } | |
8ea864cf MN |
1846 | common->phase_error = 0; |
1847 | common->short_packet_received = 0; | |
d5e2b67a | 1848 | |
8ea864cf MN |
1849 | down_read(&common->filesem); /* We're using the backing file */ |
1850 | switch (common->cmnd[0]) { | |
d5e2b67a | 1851 | |
0a6a717c | 1852 | case INQUIRY: |
8ea864cf MN |
1853 | common->data_size_from_cmnd = common->cmnd[4]; |
1854 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1855 | (1<<4), 0, |
1856 | "INQUIRY"); | |
1857 | if (reply == 0) | |
8ea864cf | 1858 | reply = do_inquiry(common, bh); |
d5e2b67a MN |
1859 | break; |
1860 | ||
0a6a717c | 1861 | case MODE_SELECT: |
8ea864cf MN |
1862 | common->data_size_from_cmnd = common->cmnd[4]; |
1863 | reply = check_command(common, 6, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1864 | (1<<1) | (1<<4), 0, |
1865 | "MODE SELECT(6)"); | |
1866 | if (reply == 0) | |
8ea864cf | 1867 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1868 | break; |
1869 | ||
0a6a717c | 1870 | case MODE_SELECT_10: |
8ea864cf MN |
1871 | common->data_size_from_cmnd = |
1872 | get_unaligned_be16(&common->cmnd[7]); | |
1873 | reply = check_command(common, 10, DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
1874 | (1<<1) | (3<<7), 0, |
1875 | "MODE SELECT(10)"); | |
1876 | if (reply == 0) | |
8ea864cf | 1877 | reply = do_mode_select(common, bh); |
d5e2b67a MN |
1878 | break; |
1879 | ||
0a6a717c | 1880 | case MODE_SENSE: |
8ea864cf MN |
1881 | common->data_size_from_cmnd = common->cmnd[4]; |
1882 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1883 | (1<<1) | (1<<2) | (1<<4), 0, |
1884 | "MODE SENSE(6)"); | |
1885 | if (reply == 0) | |
8ea864cf | 1886 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1887 | break; |
1888 | ||
0a6a717c | 1889 | case MODE_SENSE_10: |
8ea864cf MN |
1890 | common->data_size_from_cmnd = |
1891 | get_unaligned_be16(&common->cmnd[7]); | |
1892 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1893 | (1<<1) | (1<<2) | (3<<7), 0, |
1894 | "MODE SENSE(10)"); | |
1895 | if (reply == 0) | |
8ea864cf | 1896 | reply = do_mode_sense(common, bh); |
d5e2b67a MN |
1897 | break; |
1898 | ||
0a6a717c | 1899 | case ALLOW_MEDIUM_REMOVAL: |
8ea864cf MN |
1900 | common->data_size_from_cmnd = 0; |
1901 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1902 | (1<<4), 0, |
1903 | "PREVENT-ALLOW MEDIUM REMOVAL"); | |
1904 | if (reply == 0) | |
8ea864cf | 1905 | reply = do_prevent_allow(common); |
d5e2b67a MN |
1906 | break; |
1907 | ||
0a6a717c | 1908 | case READ_6: |
8ea864cf | 1909 | i = common->cmnd[4]; |
144974e7 YL |
1910 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
1911 | reply = check_command_size_in_blocks(common, 6, | |
1912 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1913 | (7<<1) | (1<<4), 1, |
1914 | "READ(6)"); | |
1915 | if (reply == 0) | |
8ea864cf | 1916 | reply = do_read(common); |
d5e2b67a MN |
1917 | break; |
1918 | ||
0a6a717c | 1919 | case READ_10: |
8ea864cf | 1920 | common->data_size_from_cmnd = |
144974e7 YL |
1921 | get_unaligned_be16(&common->cmnd[7]); |
1922 | reply = check_command_size_in_blocks(common, 10, | |
1923 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1924 | (1<<1) | (0xf<<2) | (3<<7), 1, |
1925 | "READ(10)"); | |
1926 | if (reply == 0) | |
8ea864cf | 1927 | reply = do_read(common); |
d5e2b67a MN |
1928 | break; |
1929 | ||
0a6a717c | 1930 | case READ_12: |
8ea864cf | 1931 | common->data_size_from_cmnd = |
144974e7 YL |
1932 | get_unaligned_be32(&common->cmnd[6]); |
1933 | reply = check_command_size_in_blocks(common, 12, | |
1934 | DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1935 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
1936 | "READ(12)"); | |
1937 | if (reply == 0) | |
8ea864cf | 1938 | reply = do_read(common); |
d5e2b67a MN |
1939 | break; |
1940 | ||
0a6a717c | 1941 | case READ_CAPACITY: |
8ea864cf MN |
1942 | common->data_size_from_cmnd = 8; |
1943 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1944 | (0xf<<2) | (1<<8), 1, |
1945 | "READ CAPACITY"); | |
1946 | if (reply == 0) | |
8ea864cf | 1947 | reply = do_read_capacity(common, bh); |
d5e2b67a MN |
1948 | break; |
1949 | ||
0a6a717c | 1950 | case READ_HEADER: |
8ea864cf | 1951 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1952 | goto unknown_cmnd; |
8ea864cf MN |
1953 | common->data_size_from_cmnd = |
1954 | get_unaligned_be16(&common->cmnd[7]); | |
1955 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1956 | (3<<7) | (0x1f<<1), 1, |
1957 | "READ HEADER"); | |
1958 | if (reply == 0) | |
8ea864cf | 1959 | reply = do_read_header(common, bh); |
d5e2b67a MN |
1960 | break; |
1961 | ||
0a6a717c | 1962 | case READ_TOC: |
8ea864cf | 1963 | if (!common->curlun || !common->curlun->cdrom) |
d5e2b67a | 1964 | goto unknown_cmnd; |
8ea864cf MN |
1965 | common->data_size_from_cmnd = |
1966 | get_unaligned_be16(&common->cmnd[7]); | |
1967 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1968 | (7<<6) | (1<<1), 1, |
1969 | "READ TOC"); | |
1970 | if (reply == 0) | |
8ea864cf | 1971 | reply = do_read_toc(common, bh); |
d5e2b67a MN |
1972 | break; |
1973 | ||
0a6a717c | 1974 | case READ_FORMAT_CAPACITIES: |
8ea864cf MN |
1975 | common->data_size_from_cmnd = |
1976 | get_unaligned_be16(&common->cmnd[7]); | |
1977 | reply = check_command(common, 10, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1978 | (3<<7), 1, |
1979 | "READ FORMAT CAPACITIES"); | |
1980 | if (reply == 0) | |
8ea864cf | 1981 | reply = do_read_format_capacities(common, bh); |
d5e2b67a MN |
1982 | break; |
1983 | ||
0a6a717c | 1984 | case REQUEST_SENSE: |
8ea864cf MN |
1985 | common->data_size_from_cmnd = common->cmnd[4]; |
1986 | reply = check_command(common, 6, DATA_DIR_TO_HOST, | |
d26a6aa0 MN |
1987 | (1<<4), 0, |
1988 | "REQUEST SENSE"); | |
1989 | if (reply == 0) | |
8ea864cf | 1990 | reply = do_request_sense(common, bh); |
d5e2b67a MN |
1991 | break; |
1992 | ||
0a6a717c | 1993 | case START_STOP: |
8ea864cf MN |
1994 | common->data_size_from_cmnd = 0; |
1995 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d26a6aa0 MN |
1996 | (1<<1) | (1<<4), 0, |
1997 | "START-STOP UNIT"); | |
1998 | if (reply == 0) | |
8ea864cf | 1999 | reply = do_start_stop(common); |
d5e2b67a MN |
2000 | break; |
2001 | ||
0a6a717c | 2002 | case SYNCHRONIZE_CACHE: |
8ea864cf MN |
2003 | common->data_size_from_cmnd = 0; |
2004 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
2005 | (0xf<<2) | (3<<7), 1, |
2006 | "SYNCHRONIZE CACHE"); | |
2007 | if (reply == 0) | |
8ea864cf | 2008 | reply = do_synchronize_cache(common); |
d5e2b67a MN |
2009 | break; |
2010 | ||
0a6a717c | 2011 | case TEST_UNIT_READY: |
8ea864cf MN |
2012 | common->data_size_from_cmnd = 0; |
2013 | reply = check_command(common, 6, DATA_DIR_NONE, | |
d5e2b67a MN |
2014 | 0, 1, |
2015 | "TEST UNIT READY"); | |
2016 | break; | |
2017 | ||
b73af61e MN |
2018 | /* |
2019 | * Although optional, this command is used by MS-Windows. We | |
2020 | * support a minimal version: BytChk must be 0. | |
2021 | */ | |
0a6a717c | 2022 | case VERIFY: |
8ea864cf MN |
2023 | common->data_size_from_cmnd = 0; |
2024 | reply = check_command(common, 10, DATA_DIR_NONE, | |
d26a6aa0 MN |
2025 | (1<<1) | (0xf<<2) | (3<<7), 1, |
2026 | "VERIFY"); | |
2027 | if (reply == 0) | |
8ea864cf | 2028 | reply = do_verify(common); |
d5e2b67a MN |
2029 | break; |
2030 | ||
0a6a717c | 2031 | case WRITE_6: |
8ea864cf | 2032 | i = common->cmnd[4]; |
144974e7 YL |
2033 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
2034 | reply = check_command_size_in_blocks(common, 6, | |
2035 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2036 | (7<<1) | (1<<4), 1, |
2037 | "WRITE(6)"); | |
2038 | if (reply == 0) | |
8ea864cf | 2039 | reply = do_write(common); |
d5e2b67a MN |
2040 | break; |
2041 | ||
0a6a717c | 2042 | case WRITE_10: |
8ea864cf | 2043 | common->data_size_from_cmnd = |
144974e7 YL |
2044 | get_unaligned_be16(&common->cmnd[7]); |
2045 | reply = check_command_size_in_blocks(common, 10, | |
2046 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2047 | (1<<1) | (0xf<<2) | (3<<7), 1, |
2048 | "WRITE(10)"); | |
2049 | if (reply == 0) | |
8ea864cf | 2050 | reply = do_write(common); |
d5e2b67a MN |
2051 | break; |
2052 | ||
0a6a717c | 2053 | case WRITE_12: |
8ea864cf | 2054 | common->data_size_from_cmnd = |
144974e7 YL |
2055 | get_unaligned_be32(&common->cmnd[6]); |
2056 | reply = check_command_size_in_blocks(common, 12, | |
2057 | DATA_DIR_FROM_HOST, | |
d26a6aa0 MN |
2058 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
2059 | "WRITE(12)"); | |
2060 | if (reply == 0) | |
8ea864cf | 2061 | reply = do_write(common); |
d5e2b67a MN |
2062 | break; |
2063 | ||
b73af61e MN |
2064 | /* |
2065 | * Some mandatory commands that we recognize but don't implement. | |
d5e2b67a MN |
2066 | * They don't mean much in this setting. It's left as an exercise |
2067 | * for anyone interested to implement RESERVE and RELEASE in terms | |
b73af61e MN |
2068 | * of Posix locks. |
2069 | */ | |
0a6a717c MN |
2070 | case FORMAT_UNIT: |
2071 | case RELEASE: | |
2072 | case RESERVE: | |
2073 | case SEND_DIAGNOSTIC: | |
d26a6aa0 | 2074 | /* Fall through */ |
d5e2b67a MN |
2075 | |
2076 | default: | |
d26a6aa0 | 2077 | unknown_cmnd: |
8ea864cf MN |
2078 | common->data_size_from_cmnd = 0; |
2079 | sprintf(unknown, "Unknown x%02x", common->cmnd[0]); | |
2080 | reply = check_command(common, common->cmnd_size, | |
c85dcdac | 2081 | DATA_DIR_UNKNOWN, ~0, 0, unknown); |
d26a6aa0 | 2082 | if (reply == 0) { |
8ea864cf | 2083 | common->curlun->sense_data = SS_INVALID_COMMAND; |
d5e2b67a MN |
2084 | reply = -EINVAL; |
2085 | } | |
2086 | break; | |
2087 | } | |
8ea864cf | 2088 | up_read(&common->filesem); |
d5e2b67a MN |
2089 | |
2090 | if (reply == -EINTR || signal_pending(current)) | |
2091 | return -EINTR; | |
2092 | ||
2093 | /* Set up the single reply buffer for finish_reply() */ | |
2094 | if (reply == -EINVAL) | |
d26a6aa0 | 2095 | reply = 0; /* Error reply length */ |
8ea864cf | 2096 | if (reply >= 0 && common->data_dir == DATA_DIR_TO_HOST) { |
b73af61e | 2097 | reply = min((u32)reply, common->data_size_from_cmnd); |
d5e2b67a MN |
2098 | bh->inreq->length = reply; |
2099 | bh->state = BUF_STATE_FULL; | |
8ea864cf | 2100 | common->residue -= reply; |
d26a6aa0 | 2101 | } /* Otherwise it's already set */ |
d5e2b67a MN |
2102 | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | ||
2107 | /*-------------------------------------------------------------------------*/ | |
2108 | ||
2109 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2110 | { | |
8ea864cf | 2111 | struct usb_request *req = bh->outreq; |
7ac4704c | 2112 | struct bulk_cb_wrap *cbw = req->buf; |
8ea864cf | 2113 | struct fsg_common *common = fsg->common; |
d5e2b67a MN |
2114 | |
2115 | /* Was this a real packet? Should it be ignored? */ | |
2116 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) | |
2117 | return -EINVAL; | |
2118 | ||
2119 | /* Is the CBW valid? */ | |
775dafdc | 2120 | if (req->actual != US_BULK_CB_WRAP_LEN || |
d5e2b67a | 2121 | cbw->Signature != cpu_to_le32( |
775dafdc | 2122 | US_BULK_CB_SIGN)) { |
d5e2b67a MN |
2123 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", |
2124 | req->actual, | |
2125 | le32_to_cpu(cbw->Signature)); | |
2126 | ||
b73af61e MN |
2127 | /* |
2128 | * The Bulk-only spec says we MUST stall the IN endpoint | |
d5e2b67a MN |
2129 | * (6.6.1), so it's unavoidable. It also says we must |
2130 | * retain this state until the next reset, but there's | |
2131 | * no way to tell the controller driver it should ignore | |
2132 | * Clear-Feature(HALT) requests. | |
2133 | * | |
2134 | * We aren't required to halt the OUT endpoint; instead | |
2135 | * we can simply accept and discard any data received | |
b73af61e MN |
2136 | * until the next reset. |
2137 | */ | |
d5e2b67a MN |
2138 | wedge_bulk_in_endpoint(fsg); |
2139 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); | |
2140 | return -EINVAL; | |
2141 | } | |
2142 | ||
2143 | /* Is the CBW meaningful? */ | |
dd02ea5a KO |
2144 | if (cbw->Lun >= ARRAY_SIZE(common->luns) || |
2145 | cbw->Flags & ~US_BULK_FLAG_IN || cbw->Length <= 0 || | |
2146 | cbw->Length > MAX_COMMAND_SIZE) { | |
d5e2b67a MN |
2147 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
2148 | "cmdlen %u\n", | |
2149 | cbw->Lun, cbw->Flags, cbw->Length); | |
2150 | ||
b73af61e MN |
2151 | /* |
2152 | * We can do anything we want here, so let's stall the | |
2153 | * bulk pipes if we are allowed to. | |
2154 | */ | |
8ea864cf | 2155 | if (common->can_stall) { |
d5e2b67a MN |
2156 | fsg_set_halt(fsg, fsg->bulk_out); |
2157 | halt_bulk_in_endpoint(fsg); | |
2158 | } | |
2159 | return -EINVAL; | |
2160 | } | |
2161 | ||
2162 | /* Save the command for later */ | |
8ea864cf MN |
2163 | common->cmnd_size = cbw->Length; |
2164 | memcpy(common->cmnd, cbw->CDB, common->cmnd_size); | |
775dafdc | 2165 | if (cbw->Flags & US_BULK_FLAG_IN) |
8ea864cf | 2166 | common->data_dir = DATA_DIR_TO_HOST; |
d5e2b67a | 2167 | else |
8ea864cf MN |
2168 | common->data_dir = DATA_DIR_FROM_HOST; |
2169 | common->data_size = le32_to_cpu(cbw->DataTransferLength); | |
2170 | if (common->data_size == 0) | |
2171 | common->data_dir = DATA_DIR_NONE; | |
2172 | common->lun = cbw->Lun; | |
dd02ea5a | 2173 | if (common->lun < ARRAY_SIZE(common->luns)) |
8b903fd7 | 2174 | common->curlun = common->luns[common->lun]; |
144974e7 YL |
2175 | else |
2176 | common->curlun = NULL; | |
8ea864cf | 2177 | common->tag = cbw->Tag; |
d5e2b67a MN |
2178 | return 0; |
2179 | } | |
2180 | ||
8ea864cf | 2181 | static int get_next_command(struct fsg_common *common) |
d5e2b67a MN |
2182 | { |
2183 | struct fsg_buffhd *bh; | |
2184 | int rc = 0; | |
2185 | ||
93bcf12e | 2186 | /* Wait for the next buffer to become available */ |
8ea864cf | 2187 | bh = common->next_buffhd_to_fill; |
93bcf12e | 2188 | while (bh->state != BUF_STATE_EMPTY) { |
2cf93bea | 2189 | rc = sleep_thread(common, true); |
93bcf12e MN |
2190 | if (rc) |
2191 | return rc; | |
2192 | } | |
d5e2b67a | 2193 | |
93bcf12e | 2194 | /* Queue a request to read a Bulk-only CBW */ |
775dafdc | 2195 | set_bulk_out_req_length(common, bh, US_BULK_CB_WRAP_LEN); |
fe52f792 | 2196 | if (!start_out_transfer(common, bh)) |
8ea864cf MN |
2197 | /* Don't know what to do if common->fsg is NULL */ |
2198 | return -EIO; | |
d5e2b67a | 2199 | |
b73af61e MN |
2200 | /* |
2201 | * We will drain the buffer in software, which means we | |
93bcf12e | 2202 | * can reuse it for the next filling. No need to advance |
b73af61e MN |
2203 | * next_buffhd_to_fill. |
2204 | */ | |
d5e2b67a | 2205 | |
93bcf12e MN |
2206 | /* Wait for the CBW to arrive */ |
2207 | while (bh->state != BUF_STATE_FULL) { | |
2cf93bea | 2208 | rc = sleep_thread(common, true); |
93bcf12e MN |
2209 | if (rc) |
2210 | return rc; | |
d5e2b67a | 2211 | } |
93bcf12e | 2212 | smp_rmb(); |
8ea864cf | 2213 | rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO; |
93bcf12e MN |
2214 | bh->state = BUF_STATE_EMPTY; |
2215 | ||
d5e2b67a MN |
2216 | return rc; |
2217 | } | |
2218 | ||
2219 | ||
2220 | /*-------------------------------------------------------------------------*/ | |
2221 | ||
8ea864cf | 2222 | static int alloc_request(struct fsg_common *common, struct usb_ep *ep, |
d5e2b67a MN |
2223 | struct usb_request **preq) |
2224 | { | |
2225 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
2226 | if (*preq) | |
2227 | return 0; | |
8ea864cf | 2228 | ERROR(common, "can't allocate request for %s\n", ep->name); |
d5e2b67a MN |
2229 | return -ENOMEM; |
2230 | } | |
2231 | ||
b894f60a MN |
2232 | /* Reset interface setting and re-init endpoint state (toggle etc). */ |
2233 | static int do_set_interface(struct fsg_common *common, struct fsg_dev *new_fsg) | |
d5e2b67a | 2234 | { |
b894f60a MN |
2235 | struct fsg_dev *fsg; |
2236 | int i, rc = 0; | |
d5e2b67a | 2237 | |
8ea864cf MN |
2238 | if (common->running) |
2239 | DBG(common, "reset interface\n"); | |
d5e2b67a MN |
2240 | |
2241 | reset: | |
2242 | /* Deallocate the requests */ | |
b894f60a MN |
2243 | if (common->fsg) { |
2244 | fsg = common->fsg; | |
8ea864cf | 2245 | |
6fdc5dd2 | 2246 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2247 | struct fsg_buffhd *bh = &common->buffhds[i]; |
d5e2b67a | 2248 | |
8ea864cf MN |
2249 | if (bh->inreq) { |
2250 | usb_ep_free_request(fsg->bulk_in, bh->inreq); | |
2251 | bh->inreq = NULL; | |
2252 | } | |
2253 | if (bh->outreq) { | |
2254 | usb_ep_free_request(fsg->bulk_out, bh->outreq); | |
2255 | bh->outreq = NULL; | |
2256 | } | |
d5e2b67a | 2257 | } |
8ea864cf MN |
2258 | |
2259 | /* Disable the endpoints */ | |
2260 | if (fsg->bulk_in_enabled) { | |
2261 | usb_ep_disable(fsg->bulk_in); | |
2262 | fsg->bulk_in_enabled = 0; | |
2263 | } | |
2264 | if (fsg->bulk_out_enabled) { | |
2265 | usb_ep_disable(fsg->bulk_out); | |
2266 | fsg->bulk_out_enabled = 0; | |
d5e2b67a | 2267 | } |
d5e2b67a | 2268 | |
b894f60a MN |
2269 | common->fsg = NULL; |
2270 | wake_up(&common->fsg_wait); | |
d5e2b67a | 2271 | } |
d5e2b67a | 2272 | |
8ea864cf | 2273 | common->running = 0; |
b894f60a | 2274 | if (!new_fsg || rc) |
d5e2b67a MN |
2275 | return rc; |
2276 | ||
b894f60a MN |
2277 | common->fsg = new_fsg; |
2278 | fsg = common->fsg; | |
d5e2b67a | 2279 | |
b894f60a | 2280 | /* Enable the endpoints */ |
ea2a1df7 TB |
2281 | rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in); |
2282 | if (rc) | |
2283 | goto reset; | |
2284 | rc = usb_ep_enable(fsg->bulk_in); | |
b894f60a MN |
2285 | if (rc) |
2286 | goto reset; | |
ea2a1df7 | 2287 | fsg->bulk_in->driver_data = common; |
b894f60a | 2288 | fsg->bulk_in_enabled = 1; |
8ea864cf | 2289 | |
ea2a1df7 TB |
2290 | rc = config_ep_by_speed(common->gadget, &(fsg->function), |
2291 | fsg->bulk_out); | |
2292 | if (rc) | |
2293 | goto reset; | |
2294 | rc = usb_ep_enable(fsg->bulk_out); | |
b894f60a MN |
2295 | if (rc) |
2296 | goto reset; | |
ea2a1df7 | 2297 | fsg->bulk_out->driver_data = common; |
b894f60a | 2298 | fsg->bulk_out_enabled = 1; |
29cc8897 | 2299 | common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc); |
b894f60a MN |
2300 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
2301 | ||
2302 | /* Allocate the requests */ | |
6fdc5dd2 | 2303 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
b894f60a MN |
2304 | struct fsg_buffhd *bh = &common->buffhds[i]; |
2305 | ||
2306 | rc = alloc_request(common, fsg->bulk_in, &bh->inreq); | |
8ea864cf | 2307 | if (rc) |
d5e2b67a | 2308 | goto reset; |
b894f60a | 2309 | rc = alloc_request(common, fsg->bulk_out, &bh->outreq); |
8ea864cf | 2310 | if (rc) |
d5e2b67a | 2311 | goto reset; |
b894f60a MN |
2312 | bh->inreq->buf = bh->outreq->buf = bh->buf; |
2313 | bh->inreq->context = bh->outreq->context = bh; | |
2314 | bh->inreq->complete = bulk_in_complete; | |
2315 | bh->outreq->complete = bulk_out_complete; | |
8ea864cf | 2316 | } |
d5e2b67a | 2317 | |
b894f60a | 2318 | common->running = 1; |
dd02ea5a | 2319 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) |
8b903fd7 AP |
2320 | if (common->luns[i]) |
2321 | common->luns[i]->unit_attention_data = | |
2322 | SS_RESET_OCCURRED; | |
d5e2b67a MN |
2323 | return rc; |
2324 | } | |
2325 | ||
2326 | ||
d23b0f08 MN |
2327 | /****************************** ALT CONFIGS ******************************/ |
2328 | ||
d23b0f08 MN |
2329 | static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
2330 | { | |
2331 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2332 | fsg->common->new_fsg = fsg; |
8ea864cf | 2333 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
95ed3236 | 2334 | return USB_GADGET_DELAYED_STATUS; |
d23b0f08 MN |
2335 | } |
2336 | ||
2337 | static void fsg_disable(struct usb_function *f) | |
2338 | { | |
2339 | struct fsg_dev *fsg = fsg_from_func(f); | |
b894f60a | 2340 | fsg->common->new_fsg = NULL; |
8ea864cf | 2341 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
d23b0f08 MN |
2342 | } |
2343 | ||
2344 | ||
d5e2b67a MN |
2345 | /*-------------------------------------------------------------------------*/ |
2346 | ||
8ea864cf | 2347 | static void handle_exception(struct fsg_common *common) |
d5e2b67a | 2348 | { |
d5e2b67a | 2349 | int i; |
d5e2b67a MN |
2350 | struct fsg_buffhd *bh; |
2351 | enum fsg_state old_state; | |
d5e2b67a MN |
2352 | struct fsg_lun *curlun; |
2353 | unsigned int exception_req_tag; | |
d5e2b67a | 2354 | |
b73af61e MN |
2355 | /* |
2356 | * Clear the existing signals. Anything but SIGUSR1 is converted | |
2357 | * into a high-priority EXIT exception. | |
2358 | */ | |
d5e2b67a | 2359 | for (;;) { |
be0e6f29 | 2360 | int sig = kernel_dequeue_signal(NULL); |
d5e2b67a MN |
2361 | if (!sig) |
2362 | break; | |
2363 | if (sig != SIGUSR1) { | |
8ea864cf MN |
2364 | if (common->state < FSG_STATE_EXIT) |
2365 | DBG(common, "Main thread exiting on signal\n"); | |
2366 | raise_exception(common, FSG_STATE_EXIT); | |
d5e2b67a MN |
2367 | } |
2368 | } | |
2369 | ||
2370 | /* Cancel all the pending transfers */ | |
b894f60a | 2371 | if (likely(common->fsg)) { |
6fdc5dd2 | 2372 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf MN |
2373 | bh = &common->buffhds[i]; |
2374 | if (bh->inreq_busy) | |
2375 | usb_ep_dequeue(common->fsg->bulk_in, bh->inreq); | |
2376 | if (bh->outreq_busy) | |
2377 | usb_ep_dequeue(common->fsg->bulk_out, | |
2378 | bh->outreq); | |
d5e2b67a | 2379 | } |
d5e2b67a | 2380 | |
8ea864cf MN |
2381 | /* Wait until everything is idle */ |
2382 | for (;;) { | |
2383 | int num_active = 0; | |
6fdc5dd2 | 2384 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf MN |
2385 | bh = &common->buffhds[i]; |
2386 | num_active += bh->inreq_busy + bh->outreq_busy; | |
2387 | } | |
2388 | if (num_active == 0) | |
2389 | break; | |
2cf93bea | 2390 | if (sleep_thread(common, true)) |
8ea864cf MN |
2391 | return; |
2392 | } | |
2393 | ||
2394 | /* Clear out the controller's fifos */ | |
2395 | if (common->fsg->bulk_in_enabled) | |
2396 | usb_ep_fifo_flush(common->fsg->bulk_in); | |
2397 | if (common->fsg->bulk_out_enabled) | |
2398 | usb_ep_fifo_flush(common->fsg->bulk_out); | |
2399 | } | |
d5e2b67a | 2400 | |
b73af61e MN |
2401 | /* |
2402 | * Reset the I/O buffer states and pointers, the SCSI | |
2403 | * state, and the exception. Then invoke the handler. | |
2404 | */ | |
8ea864cf | 2405 | spin_lock_irq(&common->lock); |
d5e2b67a | 2406 | |
6fdc5dd2 | 2407 | for (i = 0; i < common->fsg_num_buffers; ++i) { |
8ea864cf | 2408 | bh = &common->buffhds[i]; |
d5e2b67a MN |
2409 | bh->state = BUF_STATE_EMPTY; |
2410 | } | |
8ea864cf MN |
2411 | common->next_buffhd_to_fill = &common->buffhds[0]; |
2412 | common->next_buffhd_to_drain = &common->buffhds[0]; | |
2413 | exception_req_tag = common->exception_req_tag; | |
8ea864cf | 2414 | old_state = common->state; |
d5e2b67a MN |
2415 | |
2416 | if (old_state == FSG_STATE_ABORT_BULK_OUT) | |
8ea864cf | 2417 | common->state = FSG_STATE_STATUS_PHASE; |
d5e2b67a | 2418 | else { |
dd02ea5a | 2419 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
8b903fd7 AP |
2420 | curlun = common->luns[i]; |
2421 | if (!curlun) | |
2422 | continue; | |
d5e2b67a | 2423 | curlun->prevent_medium_removal = 0; |
d26a6aa0 MN |
2424 | curlun->sense_data = SS_NO_SENSE; |
2425 | curlun->unit_attention_data = SS_NO_SENSE; | |
d5e2b67a MN |
2426 | curlun->sense_data_info = 0; |
2427 | curlun->info_valid = 0; | |
2428 | } | |
8ea864cf | 2429 | common->state = FSG_STATE_IDLE; |
d5e2b67a | 2430 | } |
8ea864cf | 2431 | spin_unlock_irq(&common->lock); |
d5e2b67a MN |
2432 | |
2433 | /* Carry out any extra actions required for the exception */ | |
2434 | switch (old_state) { | |
d5e2b67a | 2435 | case FSG_STATE_ABORT_BULK_OUT: |
8ea864cf MN |
2436 | send_status(common); |
2437 | spin_lock_irq(&common->lock); | |
2438 | if (common->state == FSG_STATE_STATUS_PHASE) | |
2439 | common->state = FSG_STATE_IDLE; | |
2440 | spin_unlock_irq(&common->lock); | |
d5e2b67a MN |
2441 | break; |
2442 | ||
2443 | case FSG_STATE_RESET: | |
b73af61e MN |
2444 | /* |
2445 | * In case we were forced against our will to halt a | |
d5e2b67a | 2446 | * bulk endpoint, clear the halt now. (The SuperH UDC |
b73af61e MN |
2447 | * requires this.) |
2448 | */ | |
8ea864cf MN |
2449 | if (!fsg_is_set(common)) |
2450 | break; | |
2451 | if (test_and_clear_bit(IGNORE_BULK_OUT, | |
2452 | &common->fsg->atomic_bitflags)) | |
2453 | usb_ep_clear_halt(common->fsg->bulk_in); | |
d5e2b67a | 2454 | |
8ea864cf MN |
2455 | if (common->ep0_req_tag == exception_req_tag) |
2456 | ep0_queue(common); /* Complete the status stage */ | |
d5e2b67a | 2457 | |
b73af61e MN |
2458 | /* |
2459 | * Technically this should go here, but it would only be | |
d5e2b67a | 2460 | * a waste of time. Ditto for the INTERFACE_CHANGE and |
b73af61e MN |
2461 | * CONFIG_CHANGE cases. |
2462 | */ | |
dd02ea5a | 2463 | /* for (i = 0; i < common->ARRAY_SIZE(common->luns); ++i) */ |
8b903fd7 AP |
2464 | /* if (common->luns[i]) */ |
2465 | /* common->luns[i]->unit_attention_data = */ | |
2466 | /* SS_RESET_OCCURRED; */ | |
d5e2b67a MN |
2467 | break; |
2468 | ||
d5e2b67a | 2469 | case FSG_STATE_CONFIG_CHANGE: |
b894f60a | 2470 | do_set_interface(common, common->new_fsg); |
95ed3236 RQ |
2471 | if (common->new_fsg) |
2472 | usb_composite_setup_continue(common->cdev); | |
d5e2b67a MN |
2473 | break; |
2474 | ||
d5e2b67a MN |
2475 | case FSG_STATE_EXIT: |
2476 | case FSG_STATE_TERMINATED: | |
b894f60a | 2477 | do_set_interface(common, NULL); /* Free resources */ |
8ea864cf MN |
2478 | spin_lock_irq(&common->lock); |
2479 | common->state = FSG_STATE_TERMINATED; /* Stop the thread */ | |
2480 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2481 | break; |
d23b0f08 MN |
2482 | |
2483 | case FSG_STATE_INTERFACE_CHANGE: | |
2484 | case FSG_STATE_DISCONNECT: | |
2485 | case FSG_STATE_COMMAND_PHASE: | |
2486 | case FSG_STATE_DATA_PHASE: | |
2487 | case FSG_STATE_STATUS_PHASE: | |
2488 | case FSG_STATE_IDLE: | |
2489 | break; | |
d5e2b67a MN |
2490 | } |
2491 | } | |
2492 | ||
2493 | ||
2494 | /*-------------------------------------------------------------------------*/ | |
2495 | ||
8ea864cf | 2496 | static int fsg_main_thread(void *common_) |
d5e2b67a | 2497 | { |
8ea864cf | 2498 | struct fsg_common *common = common_; |
d5e2b67a | 2499 | |
b73af61e MN |
2500 | /* |
2501 | * Allow the thread to be killed by a signal, but set the signal mask | |
2502 | * to block everything but INT, TERM, KILL, and USR1. | |
2503 | */ | |
d5e2b67a MN |
2504 | allow_signal(SIGINT); |
2505 | allow_signal(SIGTERM); | |
2506 | allow_signal(SIGKILL); | |
2507 | allow_signal(SIGUSR1); | |
2508 | ||
2509 | /* Allow the thread to be frozen */ | |
2510 | set_freezable(); | |
2511 | ||
b73af61e MN |
2512 | /* |
2513 | * Arrange for userspace references to be interpreted as kernel | |
d5e2b67a | 2514 | * pointers. That way we can pass a kernel pointer to a routine |
b73af61e MN |
2515 | * that expects a __user pointer and it will work okay. |
2516 | */ | |
d5e2b67a MN |
2517 | set_fs(get_ds()); |
2518 | ||
2519 | /* The main loop */ | |
8ea864cf MN |
2520 | while (common->state != FSG_STATE_TERMINATED) { |
2521 | if (exception_in_progress(common) || signal_pending(current)) { | |
2522 | handle_exception(common); | |
d5e2b67a MN |
2523 | continue; |
2524 | } | |
2525 | ||
8ea864cf | 2526 | if (!common->running) { |
2cf93bea | 2527 | sleep_thread(common, true); |
d5e2b67a MN |
2528 | continue; |
2529 | } | |
2530 | ||
8ea864cf | 2531 | if (get_next_command(common)) |
d5e2b67a MN |
2532 | continue; |
2533 | ||
8ea864cf MN |
2534 | spin_lock_irq(&common->lock); |
2535 | if (!exception_in_progress(common)) | |
2536 | common->state = FSG_STATE_DATA_PHASE; | |
2537 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2538 | |
8ea864cf | 2539 | if (do_scsi_command(common) || finish_reply(common)) |
d5e2b67a MN |
2540 | continue; |
2541 | ||
8ea864cf MN |
2542 | spin_lock_irq(&common->lock); |
2543 | if (!exception_in_progress(common)) | |
2544 | common->state = FSG_STATE_STATUS_PHASE; | |
2545 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2546 | |
8ea864cf | 2547 | if (send_status(common)) |
d5e2b67a MN |
2548 | continue; |
2549 | ||
8ea864cf MN |
2550 | spin_lock_irq(&common->lock); |
2551 | if (!exception_in_progress(common)) | |
2552 | common->state = FSG_STATE_IDLE; | |
2553 | spin_unlock_irq(&common->lock); | |
d23b0f08 | 2554 | } |
d5e2b67a | 2555 | |
8ea864cf MN |
2556 | spin_lock_irq(&common->lock); |
2557 | common->thread_task = NULL; | |
2558 | spin_unlock_irq(&common->lock); | |
d5e2b67a | 2559 | |
8876f5e7 MN |
2560 | if (!common->ops || !common->ops->thread_exits |
2561 | || common->ops->thread_exits(common) < 0) { | |
dd02ea5a | 2562 | int i; |
7f1ee826 MN |
2563 | |
2564 | down_write(&common->filesem); | |
dd02ea5a KO |
2565 | for (i = 0; i < ARRAY_SIZE(common->luns); --i) { |
2566 | struct fsg_lun *curlun = common->luns[i]; | |
8b903fd7 | 2567 | if (!curlun || !fsg_lun_is_open(curlun)) |
7f1ee826 MN |
2568 | continue; |
2569 | ||
2570 | fsg_lun_close(curlun); | |
2571 | curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; | |
2572 | } | |
2573 | up_write(&common->filesem); | |
2574 | } | |
d5e2b67a | 2575 | |
00cb636e | 2576 | /* Let fsg_unbind() know the thread has exited */ |
8ea864cf | 2577 | complete_and_exit(&common->thread_notifier, 0); |
d5e2b67a MN |
2578 | } |
2579 | ||
2580 | ||
9c610213 | 2581 | /*************************** DEVICE ATTRIBUTES ***************************/ |
d5e2b67a | 2582 | |
6fdc5dd2 AP |
2583 | static ssize_t ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
2584 | { | |
77850ae2 AP |
2585 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2586 | ||
2587 | return fsg_show_ro(curlun, buf); | |
6fdc5dd2 AP |
2588 | } |
2589 | ||
2590 | static ssize_t nofua_show(struct device *dev, struct device_attribute *attr, | |
2591 | char *buf) | |
2592 | { | |
77850ae2 AP |
2593 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2594 | ||
2595 | return fsg_show_nofua(curlun, buf); | |
6fdc5dd2 AP |
2596 | } |
2597 | ||
2598 | static ssize_t file_show(struct device *dev, struct device_attribute *attr, | |
2599 | char *buf) | |
2600 | { | |
77850ae2 AP |
2601 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2602 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2603 | ||
2604 | return fsg_show_file(curlun, filesem, buf); | |
6fdc5dd2 AP |
2605 | } |
2606 | ||
2607 | static ssize_t ro_store(struct device *dev, struct device_attribute *attr, | |
2608 | const char *buf, size_t count) | |
2609 | { | |
77850ae2 AP |
2610 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2611 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2612 | ||
2613 | return fsg_store_ro(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2614 | } |
2615 | ||
2616 | static ssize_t nofua_store(struct device *dev, struct device_attribute *attr, | |
2617 | const char *buf, size_t count) | |
2618 | { | |
77850ae2 AP |
2619 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2620 | ||
2621 | return fsg_store_nofua(curlun, buf, count); | |
6fdc5dd2 AP |
2622 | } |
2623 | ||
2624 | static ssize_t file_store(struct device *dev, struct device_attribute *attr, | |
2625 | const char *buf, size_t count) | |
2626 | { | |
77850ae2 AP |
2627 | struct fsg_lun *curlun = fsg_lun_from_dev(dev); |
2628 | struct rw_semaphore *filesem = dev_get_drvdata(dev); | |
2629 | ||
2630 | return fsg_store_file(curlun, filesem, buf, count); | |
6fdc5dd2 AP |
2631 | } |
2632 | ||
ce26bd23 | 2633 | static DEVICE_ATTR_RW(nofua); |
c7b364f7 TI |
2634 | /* mode wil be set in fsg_lun_attr_is_visible() */ |
2635 | static DEVICE_ATTR(ro, 0, ro_show, ro_store); | |
2636 | static DEVICE_ATTR(file, 0, file_show, file_store); | |
d5e2b67a | 2637 | |
9c610213 MN |
2638 | /****************************** FSG COMMON ******************************/ |
2639 | ||
2640 | static void fsg_common_release(struct kref *ref); | |
d5e2b67a | 2641 | |
9c610213 | 2642 | static void fsg_lun_release(struct device *dev) |
d5e2b67a | 2643 | { |
9c610213 | 2644 | /* Nothing needs to be done */ |
d5e2b67a MN |
2645 | } |
2646 | ||
f3fed367 | 2647 | void fsg_common_get(struct fsg_common *common) |
d5e2b67a | 2648 | { |
9c610213 | 2649 | kref_get(&common->ref); |
d5e2b67a | 2650 | } |
7a93d040 | 2651 | EXPORT_SYMBOL_GPL(fsg_common_get); |
d5e2b67a | 2652 | |
f3fed367 | 2653 | void fsg_common_put(struct fsg_common *common) |
9c610213 MN |
2654 | { |
2655 | kref_put(&common->ref, fsg_common_release); | |
2656 | } | |
7a93d040 | 2657 | EXPORT_SYMBOL_GPL(fsg_common_put); |
9c610213 | 2658 | |
7a93d040 | 2659 | static struct fsg_common *fsg_common_setup(struct fsg_common *common) |
b24650df AP |
2660 | { |
2661 | if (!common) { | |
2662 | common = kzalloc(sizeof(*common), GFP_KERNEL); | |
2663 | if (!common) | |
2664 | return ERR_PTR(-ENOMEM); | |
2665 | common->free_storage_on_release = 1; | |
2666 | } else { | |
b24650df AP |
2667 | common->free_storage_on_release = 0; |
2668 | } | |
2669 | init_rwsem(&common->filesem); | |
2670 | spin_lock_init(&common->lock); | |
2671 | kref_init(&common->ref); | |
2672 | init_completion(&common->thread_notifier); | |
2673 | init_waitqueue_head(&common->fsg_wait); | |
2674 | common->state = FSG_STATE_TERMINATED; | |
dd02ea5a | 2675 | memset(common->luns, 0, sizeof(common->luns)); |
b24650df AP |
2676 | |
2677 | return common; | |
2678 | } | |
2679 | ||
bd528d4e AP |
2680 | void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs) |
2681 | { | |
2682 | common->sysfs = sysfs; | |
2683 | } | |
7a93d040 | 2684 | EXPORT_SYMBOL_GPL(fsg_common_set_sysfs); |
bd528d4e | 2685 | |
8502d66d AP |
2686 | static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n) |
2687 | { | |
2688 | if (buffhds) { | |
2689 | struct fsg_buffhd *bh = buffhds; | |
2690 | while (n--) { | |
2691 | kfree(bh->buf); | |
2692 | ++bh; | |
2693 | } | |
2694 | kfree(buffhds); | |
2695 | } | |
2696 | } | |
2697 | ||
6313caac AP |
2698 | int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n) |
2699 | { | |
2700 | struct fsg_buffhd *bh, *buffhds; | |
fe5a6c48 | 2701 | int i; |
6313caac AP |
2702 | |
2703 | buffhds = kcalloc(n, sizeof(*buffhds), GFP_KERNEL); | |
2704 | if (!buffhds) | |
2705 | return -ENOMEM; | |
2706 | ||
2707 | /* Data buffers cyclic list */ | |
2708 | bh = buffhds; | |
2709 | i = n; | |
2710 | goto buffhds_first_it; | |
2711 | do { | |
2712 | bh->next = bh + 1; | |
2713 | ++bh; | |
2714 | buffhds_first_it: | |
2715 | bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL); | |
2716 | if (unlikely(!bh->buf)) | |
2717 | goto error_release; | |
2718 | } while (--i); | |
2719 | bh->next = buffhds; | |
2720 | ||
2721 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2722 | common->fsg_num_buffers = n; | |
2723 | common->buffhds = buffhds; | |
2724 | ||
2725 | return 0; | |
2726 | ||
2727 | error_release: | |
2728 | /* | |
2729 | * "buf"s pointed to by heads after n - i are NULL | |
2730 | * so releasing them won't hurt | |
2731 | */ | |
2732 | _fsg_common_free_buffers(buffhds, n); | |
2733 | ||
2734 | return -ENOMEM; | |
2735 | } | |
7a93d040 | 2736 | EXPORT_SYMBOL_GPL(fsg_common_set_num_buffers); |
6313caac | 2737 | |
5542f58c | 2738 | void fsg_common_remove_lun(struct fsg_lun *lun) |
70634170 | 2739 | { |
5542f58c | 2740 | if (device_is_registered(&lun->dev)) |
70634170 | 2741 | device_unregister(&lun->dev); |
70634170 AP |
2742 | fsg_lun_close(lun); |
2743 | kfree(lun); | |
2744 | } | |
7a93d040 | 2745 | EXPORT_SYMBOL_GPL(fsg_common_remove_lun); |
70634170 AP |
2746 | |
2747 | static void _fsg_common_remove_luns(struct fsg_common *common, int n) | |
2748 | { | |
2749 | int i; | |
2750 | ||
2751 | for (i = 0; i < n; ++i) | |
2752 | if (common->luns[i]) { | |
5542f58c | 2753 | fsg_common_remove_lun(common->luns[i]); |
70634170 AP |
2754 | common->luns[i] = NULL; |
2755 | } | |
2756 | } | |
2757 | ||
2758 | void fsg_common_remove_luns(struct fsg_common *common) | |
2759 | { | |
dd02ea5a | 2760 | _fsg_common_remove_luns(common, ARRAY_SIZE(common->luns)); |
70634170 | 2761 | } |
bab7a1f1 | 2762 | EXPORT_SYMBOL_GPL(fsg_common_remove_luns); |
70634170 | 2763 | |
2412fbf1 AP |
2764 | void fsg_common_set_ops(struct fsg_common *common, |
2765 | const struct fsg_operations *ops) | |
2766 | { | |
2767 | common->ops = ops; | |
2768 | } | |
7a93d040 | 2769 | EXPORT_SYMBOL_GPL(fsg_common_set_ops); |
2412fbf1 | 2770 | |
e5eaa0dc AP |
2771 | void fsg_common_free_buffers(struct fsg_common *common) |
2772 | { | |
2773 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); | |
2774 | common->buffhds = NULL; | |
2775 | } | |
7a93d040 | 2776 | EXPORT_SYMBOL_GPL(fsg_common_free_buffers); |
70634170 | 2777 | |
a891d7a3 AP |
2778 | int fsg_common_set_cdev(struct fsg_common *common, |
2779 | struct usb_composite_dev *cdev, bool can_stall) | |
2780 | { | |
2781 | struct usb_string *us; | |
2782 | ||
2783 | common->gadget = cdev->gadget; | |
2784 | common->ep0 = cdev->gadget->ep0; | |
2785 | common->ep0req = cdev->req; | |
2786 | common->cdev = cdev; | |
2787 | ||
2788 | us = usb_gstrings_attach(cdev, fsg_strings_array, | |
2789 | ARRAY_SIZE(fsg_strings)); | |
2790 | if (IS_ERR(us)) | |
2791 | return PTR_ERR(us); | |
2792 | ||
2793 | fsg_intf_desc.iInterface = us[FSG_STRING_INTERFACE].id; | |
2794 | ||
2795 | /* | |
2796 | * Some peripheral controllers are known not to be able to | |
2797 | * halt bulk endpoints correctly. If one of them is present, | |
2798 | * disable stalls. | |
2799 | */ | |
a4cc4215 RB |
2800 | common->can_stall = can_stall && |
2801 | gadget_is_stall_supported(common->gadget); | |
a891d7a3 AP |
2802 | |
2803 | return 0; | |
2804 | } | |
7a93d040 | 2805 | EXPORT_SYMBOL_GPL(fsg_common_set_cdev); |
a891d7a3 | 2806 | |
c7b364f7 TI |
2807 | static struct attribute *fsg_lun_dev_attrs[] = { |
2808 | &dev_attr_ro.attr, | |
2809 | &dev_attr_file.attr, | |
2810 | &dev_attr_nofua.attr, | |
2811 | NULL | |
2812 | }; | |
b27c08c9 | 2813 | |
c7b364f7 TI |
2814 | static umode_t fsg_lun_dev_is_visible(struct kobject *kobj, |
2815 | struct attribute *attr, int idx) | |
2816 | { | |
2817 | struct device *dev = kobj_to_dev(kobj); | |
2818 | struct fsg_lun *lun = fsg_lun_from_dev(dev); | |
b27c08c9 | 2819 | |
c7b364f7 TI |
2820 | if (attr == &dev_attr_ro.attr) |
2821 | return lun->cdrom ? S_IRUGO : (S_IWUSR | S_IRUGO); | |
2822 | if (attr == &dev_attr_file.attr) | |
2823 | return lun->removable ? (S_IWUSR | S_IRUGO) : S_IRUGO; | |
2824 | return attr->mode; | |
2825 | } | |
b27c08c9 | 2826 | |
c7b364f7 TI |
2827 | static const struct attribute_group fsg_lun_dev_group = { |
2828 | .attrs = fsg_lun_dev_attrs, | |
2829 | .is_visible = fsg_lun_dev_is_visible, | |
2830 | }; | |
b27c08c9 | 2831 | |
c7b364f7 TI |
2832 | static const struct attribute_group *fsg_lun_dev_groups[] = { |
2833 | &fsg_lun_dev_group, | |
2834 | NULL | |
2835 | }; | |
b27c08c9 AP |
2836 | |
2837 | int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg, | |
2838 | unsigned int id, const char *name, | |
2839 | const char **name_pfx) | |
2840 | { | |
2841 | struct fsg_lun *lun; | |
2842 | char *pathbuf, *p; | |
2843 | int rc = -ENOMEM; | |
2844 | ||
dd02ea5a | 2845 | if (id >= ARRAY_SIZE(common->luns)) |
b27c08c9 AP |
2846 | return -ENODEV; |
2847 | ||
2848 | if (common->luns[id]) | |
2849 | return -EBUSY; | |
2850 | ||
2851 | if (!cfg->filename && !cfg->removable) { | |
2852 | pr_err("no file given for LUN%d\n", id); | |
2853 | return -EINVAL; | |
2854 | } | |
2855 | ||
2856 | lun = kzalloc(sizeof(*lun), GFP_KERNEL); | |
2857 | if (!lun) | |
2858 | return -ENOMEM; | |
2859 | ||
2860 | lun->name_pfx = name_pfx; | |
2861 | ||
2862 | lun->cdrom = !!cfg->cdrom; | |
2863 | lun->ro = cfg->cdrom || cfg->ro; | |
2864 | lun->initially_ro = lun->ro; | |
2865 | lun->removable = !!cfg->removable; | |
2866 | ||
2867 | if (!common->sysfs) { | |
2868 | /* we DON'T own the name!*/ | |
2869 | lun->name = name; | |
2870 | } else { | |
2871 | lun->dev.release = fsg_lun_release; | |
2872 | lun->dev.parent = &common->gadget->dev; | |
c7b364f7 | 2873 | lun->dev.groups = fsg_lun_dev_groups; |
b27c08c9 | 2874 | dev_set_drvdata(&lun->dev, &common->filesem); |
a1924d8a | 2875 | dev_set_name(&lun->dev, "%s", name); |
b27c08c9 AP |
2876 | lun->name = dev_name(&lun->dev); |
2877 | ||
c7b364f7 | 2878 | rc = device_register(&lun->dev); |
b27c08c9 AP |
2879 | if (rc) { |
2880 | pr_info("failed to register LUN%d: %d\n", id, rc); | |
c7b364f7 | 2881 | put_device(&lun->dev); |
b27c08c9 AP |
2882 | goto error_sysfs; |
2883 | } | |
2884 | } | |
2885 | ||
2886 | common->luns[id] = lun; | |
2887 | ||
2888 | if (cfg->filename) { | |
2889 | rc = fsg_lun_open(lun, cfg->filename); | |
2890 | if (rc) | |
2891 | goto error_lun; | |
2892 | } | |
2893 | ||
2894 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); | |
2895 | p = "(no medium)"; | |
2896 | if (fsg_lun_is_open(lun)) { | |
2897 | p = "(error)"; | |
2898 | if (pathbuf) { | |
9bf39ab2 | 2899 | p = file_path(lun->filp, pathbuf, PATH_MAX); |
b27c08c9 AP |
2900 | if (IS_ERR(p)) |
2901 | p = "(error)"; | |
2902 | } | |
2903 | } | |
2904 | pr_info("LUN: %s%s%sfile: %s\n", | |
2905 | lun->removable ? "removable " : "", | |
2906 | lun->ro ? "read only " : "", | |
2907 | lun->cdrom ? "CD-ROM " : "", | |
2908 | p); | |
2909 | kfree(pathbuf); | |
2910 | ||
2911 | return 0; | |
2912 | ||
2913 | error_lun: | |
5542f58c | 2914 | if (device_is_registered(&lun->dev)) |
b27c08c9 | 2915 | device_unregister(&lun->dev); |
b27c08c9 AP |
2916 | fsg_lun_close(lun); |
2917 | common->luns[id] = NULL; | |
2918 | error_sysfs: | |
2919 | kfree(lun); | |
2920 | return rc; | |
2921 | } | |
7a93d040 | 2922 | EXPORT_SYMBOL_GPL(fsg_common_create_lun); |
b27c08c9 AP |
2923 | |
2924 | int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg) | |
2925 | { | |
2926 | char buf[8]; /* enough for 100000000 different numbers, decimal */ | |
2927 | int i, rc; | |
2928 | ||
dd02ea5a KO |
2929 | fsg_common_remove_luns(common); |
2930 | ||
2931 | for (i = 0; i < cfg->nluns; ++i) { | |
b27c08c9 AP |
2932 | snprintf(buf, sizeof(buf), "lun%d", i); |
2933 | rc = fsg_common_create_lun(common, &cfg->luns[i], i, buf, NULL); | |
2934 | if (rc) | |
2935 | goto fail; | |
2936 | } | |
2937 | ||
dd02ea5a | 2938 | pr_info("Number of LUNs=%d\n", cfg->nluns); |
b27c08c9 AP |
2939 | |
2940 | return 0; | |
2941 | ||
2942 | fail: | |
2943 | _fsg_common_remove_luns(common, i); | |
2944 | return rc; | |
2945 | } | |
7a93d040 | 2946 | EXPORT_SYMBOL_GPL(fsg_common_create_luns); |
b27c08c9 | 2947 | |
23682e3c AP |
2948 | void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn, |
2949 | const char *pn) | |
2950 | { | |
2951 | int i; | |
2952 | ||
2953 | /* Prepare inquiryString */ | |
2954 | i = get_default_bcdDevice(); | |
2955 | snprintf(common->inquiry_string, sizeof(common->inquiry_string), | |
2956 | "%-8s%-16s%04x", vn ?: "Linux", | |
2957 | /* Assume product name dependent on the first LUN */ | |
2958 | pn ?: ((*common->luns)->cdrom | |
2959 | ? "File-CD Gadget" | |
2960 | : "File-Stor Gadget"), | |
2961 | i); | |
2962 | } | |
7a93d040 | 2963 | EXPORT_SYMBOL_GPL(fsg_common_set_inquiry_string); |
23682e3c | 2964 | |
9c610213 MN |
2965 | static void fsg_common_release(struct kref *ref) |
2966 | { | |
b9e00088 | 2967 | struct fsg_common *common = container_of(ref, struct fsg_common, ref); |
dd02ea5a | 2968 | int i; |
9c610213 | 2969 | |
8ea864cf MN |
2970 | /* If the thread isn't already dead, tell it to exit now */ |
2971 | if (common->state != FSG_STATE_TERMINATED) { | |
2972 | raise_exception(common, FSG_STATE_EXIT); | |
2973 | wait_for_completion(&common->thread_notifier); | |
f78bbcae | 2974 | common->thread_task = NULL; |
8ea864cf MN |
2975 | } |
2976 | ||
dd02ea5a KO |
2977 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { |
2978 | struct fsg_lun *lun = common->luns[i]; | |
2979 | if (!lun) | |
2980 | continue; | |
2981 | fsg_lun_close(lun); | |
5542f58c | 2982 | if (device_is_registered(&lun->dev)) |
dd02ea5a KO |
2983 | device_unregister(&lun->dev); |
2984 | kfree(lun); | |
9c610213 MN |
2985 | } |
2986 | ||
8502d66d | 2987 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); |
9c610213 MN |
2988 | if (common->free_storage_on_release) |
2989 | kfree(common); | |
2990 | } | |
2991 | ||
2992 | ||
2993 | /*-------------------------------------------------------------------------*/ | |
2994 | ||
28824b18 | 2995 | static int fsg_bind(struct usb_configuration *c, struct usb_function *f) |
d5e2b67a | 2996 | { |
d23b0f08 | 2997 | struct fsg_dev *fsg = fsg_from_func(f); |
dd02ea5a | 2998 | struct fsg_common *common = fsg->common; |
d23b0f08 | 2999 | struct usb_gadget *gadget = c->cdev->gadget; |
d5e2b67a | 3000 | int i; |
d5e2b67a | 3001 | struct usb_ep *ep; |
10287bae SAS |
3002 | unsigned max_burst; |
3003 | int ret; | |
e5eaa0dc | 3004 | struct fsg_opts *opts; |
7a93d040 | 3005 | |
dd02ea5a KO |
3006 | /* Don't allow to bind if we don't have at least one LUN */ |
3007 | ret = _fsg_common_get_max_lun(common); | |
3008 | if (ret < 0) { | |
3009 | pr_err("There should be at least one LUN.\n"); | |
3010 | return -EINVAL; | |
3011 | } | |
3012 | ||
e5eaa0dc AP |
3013 | opts = fsg_opts_from_func_inst(f->fi); |
3014 | if (!opts->no_configfs) { | |
3015 | ret = fsg_common_set_cdev(fsg->common, c->cdev, | |
3016 | fsg->common->can_stall); | |
3017 | if (ret) | |
3018 | return ret; | |
f91d2f43 | 3019 | fsg_common_set_inquiry_string(fsg->common, NULL, NULL); |
f78bbcae MN |
3020 | } |
3021 | ||
3022 | if (!common->thread_task) { | |
3023 | common->state = FSG_STATE_IDLE; | |
3024 | common->thread_task = | |
3025 | kthread_create(fsg_main_thread, common, "file-storage"); | |
3026 | if (IS_ERR(common->thread_task)) { | |
3027 | int ret = PTR_ERR(common->thread_task); | |
3028 | common->thread_task = NULL; | |
3029 | common->state = FSG_STATE_TERMINATED; | |
e5eaa0dc | 3030 | return ret; |
f78bbcae MN |
3031 | } |
3032 | DBG(common, "I/O thread pid: %d\n", | |
3033 | task_pid_nr(common->thread_task)); | |
3034 | wake_up_process(common->thread_task); | |
e5eaa0dc | 3035 | } |
e5eaa0dc | 3036 | |
d5e2b67a | 3037 | fsg->gadget = gadget; |
d5e2b67a | 3038 | |
d23b0f08 MN |
3039 | /* New interface */ |
3040 | i = usb_interface_id(c, f); | |
3041 | if (i < 0) | |
8078f314 | 3042 | goto fail; |
d23b0f08 MN |
3043 | fsg_intf_desc.bInterfaceNumber = i; |
3044 | fsg->interface_number = i; | |
d5e2b67a | 3045 | |
d5e2b67a | 3046 | /* Find all the endpoints we will use */ |
d5e2b67a MN |
3047 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); |
3048 | if (!ep) | |
3049 | goto autoconf_fail; | |
d5e2b67a MN |
3050 | fsg->bulk_in = ep; |
3051 | ||
3052 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc); | |
3053 | if (!ep) | |
3054 | goto autoconf_fail; | |
d5e2b67a MN |
3055 | fsg->bulk_out = ep; |
3056 | ||
10287bae SAS |
3057 | /* Assume endpoint addresses are the same for both speeds */ |
3058 | fsg_hs_bulk_in_desc.bEndpointAddress = | |
3059 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
3060 | fsg_hs_bulk_out_desc.bEndpointAddress = | |
3061 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
4bb99b7c | 3062 | |
10287bae SAS |
3063 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
3064 | max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15); | |
4bb99b7c | 3065 | |
10287bae SAS |
3066 | fsg_ss_bulk_in_desc.bEndpointAddress = |
3067 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
3068 | fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 3069 | |
10287bae SAS |
3070 | fsg_ss_bulk_out_desc.bEndpointAddress = |
3071 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
3072 | fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst; | |
4bb99b7c | 3073 | |
10287bae | 3074 | ret = usb_assign_descriptors(f, fsg_fs_function, fsg_hs_function, |
59a3cedf | 3075 | fsg_ss_function, fsg_ss_function); |
10287bae SAS |
3076 | if (ret) |
3077 | goto autoconf_fail; | |
4bb99b7c | 3078 | |
d5e2b67a MN |
3079 | return 0; |
3080 | ||
3081 | autoconf_fail: | |
3082 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); | |
8078f314 SSR |
3083 | i = -ENOTSUPP; |
3084 | fail: | |
3085 | /* terminate the thread */ | |
3086 | if (fsg->common->state != FSG_STATE_TERMINATED) { | |
3087 | raise_exception(fsg->common, FSG_STATE_EXIT); | |
3088 | wait_for_completion(&fsg->common->thread_notifier); | |
3089 | } | |
3090 | return i; | |
d5e2b67a MN |
3091 | } |
3092 | ||
e5eaa0dc AP |
3093 | /****************************** ALLOCATE FUNCTION *************************/ |
3094 | ||
3095 | static void fsg_unbind(struct usb_configuration *c, struct usb_function *f) | |
3096 | { | |
3097 | struct fsg_dev *fsg = fsg_from_func(f); | |
3098 | struct fsg_common *common = fsg->common; | |
3099 | ||
3100 | DBG(fsg, "unbind\n"); | |
3101 | if (fsg->common->fsg == fsg) { | |
3102 | fsg->common->new_fsg = NULL; | |
3103 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); | |
3104 | /* FIXME: make interruptible or killable somehow? */ | |
3105 | wait_event(common->fsg_wait, common->fsg != fsg); | |
3106 | } | |
3107 | ||
e5eaa0dc | 3108 | usb_free_all_descriptors(&fsg->function); |
d5e2b67a | 3109 | } |
481e4929 | 3110 | |
ef0aa4b9 AP |
3111 | static inline struct fsg_lun_opts *to_fsg_lun_opts(struct config_item *item) |
3112 | { | |
3113 | return container_of(to_config_group(item), struct fsg_lun_opts, group); | |
3114 | } | |
3115 | ||
3116 | static inline struct fsg_opts *to_fsg_opts(struct config_item *item) | |
3117 | { | |
3118 | return container_of(to_config_group(item), struct fsg_opts, | |
3119 | func_inst.group); | |
3120 | } | |
3121 | ||
ef0aa4b9 AP |
3122 | static void fsg_lun_attr_release(struct config_item *item) |
3123 | { | |
3124 | struct fsg_lun_opts *lun_opts; | |
3125 | ||
3126 | lun_opts = to_fsg_lun_opts(item); | |
3127 | kfree(lun_opts); | |
3128 | } | |
3129 | ||
3130 | static struct configfs_item_operations fsg_lun_item_ops = { | |
5bb7289d | 3131 | .release = fsg_lun_attr_release, |
ef0aa4b9 AP |
3132 | }; |
3133 | ||
4a90cb20 | 3134 | static ssize_t fsg_lun_opts_file_show(struct config_item *item, char *page) |
ef0aa4b9 | 3135 | { |
4a90cb20 CH |
3136 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3137 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3138 | |
3139 | return fsg_show_file(opts->lun, &fsg_opts->common->filesem, page); | |
3140 | } | |
3141 | ||
4a90cb20 | 3142 | static ssize_t fsg_lun_opts_file_store(struct config_item *item, |
ef0aa4b9 AP |
3143 | const char *page, size_t len) |
3144 | { | |
4a90cb20 CH |
3145 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3146 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3147 | |
3148 | return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len); | |
3149 | } | |
3150 | ||
4a90cb20 | 3151 | CONFIGFS_ATTR(fsg_lun_opts_, file); |
ef0aa4b9 | 3152 | |
4a90cb20 | 3153 | static ssize_t fsg_lun_opts_ro_show(struct config_item *item, char *page) |
ef0aa4b9 | 3154 | { |
4a90cb20 | 3155 | return fsg_show_ro(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3156 | } |
3157 | ||
4a90cb20 | 3158 | static ssize_t fsg_lun_opts_ro_store(struct config_item *item, |
ef0aa4b9 AP |
3159 | const char *page, size_t len) |
3160 | { | |
4a90cb20 CH |
3161 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3162 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
ef0aa4b9 AP |
3163 | |
3164 | return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len); | |
3165 | } | |
3166 | ||
4a90cb20 | 3167 | CONFIGFS_ATTR(fsg_lun_opts_, ro); |
ef0aa4b9 | 3168 | |
4a90cb20 | 3169 | static ssize_t fsg_lun_opts_removable_show(struct config_item *item, |
ef0aa4b9 AP |
3170 | char *page) |
3171 | { | |
4a90cb20 | 3172 | return fsg_show_removable(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3173 | } |
3174 | ||
4a90cb20 | 3175 | static ssize_t fsg_lun_opts_removable_store(struct config_item *item, |
ef0aa4b9 AP |
3176 | const char *page, size_t len) |
3177 | { | |
4a90cb20 | 3178 | return fsg_store_removable(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3179 | } |
3180 | ||
4a90cb20 | 3181 | CONFIGFS_ATTR(fsg_lun_opts_, removable); |
ef0aa4b9 | 3182 | |
4a90cb20 | 3183 | static ssize_t fsg_lun_opts_cdrom_show(struct config_item *item, char *page) |
ef0aa4b9 | 3184 | { |
4a90cb20 | 3185 | return fsg_show_cdrom(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3186 | } |
3187 | ||
4a90cb20 | 3188 | static ssize_t fsg_lun_opts_cdrom_store(struct config_item *item, |
ef0aa4b9 AP |
3189 | const char *page, size_t len) |
3190 | { | |
4a90cb20 CH |
3191 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item); |
3192 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent); | |
b8798636 AP |
3193 | |
3194 | return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page, | |
3195 | len); | |
ef0aa4b9 AP |
3196 | } |
3197 | ||
4a90cb20 | 3198 | CONFIGFS_ATTR(fsg_lun_opts_, cdrom); |
ef0aa4b9 | 3199 | |
4a90cb20 | 3200 | static ssize_t fsg_lun_opts_nofua_show(struct config_item *item, char *page) |
ef0aa4b9 | 3201 | { |
4a90cb20 | 3202 | return fsg_show_nofua(to_fsg_lun_opts(item)->lun, page); |
ef0aa4b9 AP |
3203 | } |
3204 | ||
4a90cb20 | 3205 | static ssize_t fsg_lun_opts_nofua_store(struct config_item *item, |
ef0aa4b9 AP |
3206 | const char *page, size_t len) |
3207 | { | |
4a90cb20 | 3208 | return fsg_store_nofua(to_fsg_lun_opts(item)->lun, page, len); |
ef0aa4b9 AP |
3209 | } |
3210 | ||
4a90cb20 | 3211 | CONFIGFS_ATTR(fsg_lun_opts_, nofua); |
ef0aa4b9 | 3212 | |
6ac47090 PG |
3213 | static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item, |
3214 | char *page) | |
3215 | { | |
3216 | return fsg_show_inquiry_string(to_fsg_lun_opts(item)->lun, page); | |
3217 | } | |
3218 | ||
3219 | static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item, | |
3220 | const char *page, size_t len) | |
3221 | { | |
3222 | return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len); | |
3223 | } | |
3224 | ||
3225 | CONFIGFS_ATTR(fsg_lun_opts_, inquiry_string); | |
3226 | ||
ef0aa4b9 | 3227 | static struct configfs_attribute *fsg_lun_attrs[] = { |
4a90cb20 CH |
3228 | &fsg_lun_opts_attr_file, |
3229 | &fsg_lun_opts_attr_ro, | |
3230 | &fsg_lun_opts_attr_removable, | |
3231 | &fsg_lun_opts_attr_cdrom, | |
3232 | &fsg_lun_opts_attr_nofua, | |
6ac47090 | 3233 | &fsg_lun_opts_attr_inquiry_string, |
ef0aa4b9 AP |
3234 | NULL, |
3235 | }; | |
3236 | ||
3237 | static struct config_item_type fsg_lun_type = { | |
3238 | .ct_item_ops = &fsg_lun_item_ops, | |
3239 | .ct_attrs = fsg_lun_attrs, | |
3240 | .ct_owner = THIS_MODULE, | |
3241 | }; | |
3242 | ||
ef0aa4b9 AP |
3243 | static struct config_group *fsg_lun_make(struct config_group *group, |
3244 | const char *name) | |
3245 | { | |
3246 | struct fsg_lun_opts *opts; | |
3247 | struct fsg_opts *fsg_opts; | |
3248 | struct fsg_lun_config config; | |
3249 | char *num_str; | |
3250 | u8 num; | |
3251 | int ret; | |
3252 | ||
3253 | num_str = strchr(name, '.'); | |
3254 | if (!num_str) { | |
3255 | pr_err("Unable to locate . in LUN.NUMBER\n"); | |
3256 | return ERR_PTR(-EINVAL); | |
3257 | } | |
3258 | num_str++; | |
3259 | ||
3260 | ret = kstrtou8(num_str, 0, &num); | |
3261 | if (ret) | |
3262 | return ERR_PTR(ret); | |
3263 | ||
3264 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3265 | if (num >= FSG_MAX_LUNS) | |
5bb7289d AP |
3266 | return ERR_PTR(-ERANGE); |
3267 | ||
ef0aa4b9 AP |
3268 | mutex_lock(&fsg_opts->lock); |
3269 | if (fsg_opts->refcnt || fsg_opts->common->luns[num]) { | |
3270 | ret = -EBUSY; | |
3271 | goto out; | |
3272 | } | |
3273 | ||
3274 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3275 | if (!opts) { | |
3276 | ret = -ENOMEM; | |
3277 | goto out; | |
3278 | } | |
3279 | ||
3280 | memset(&config, 0, sizeof(config)); | |
3281 | config.removable = true; | |
3282 | ||
ef0aa4b9 AP |
3283 | ret = fsg_common_create_lun(fsg_opts->common, &config, num, name, |
3284 | (const char **)&group->cg_item.ci_name); | |
3285 | if (ret) { | |
3286 | kfree(opts); | |
3287 | goto out; | |
3288 | } | |
3289 | opts->lun = fsg_opts->common->luns[num]; | |
3290 | opts->lun_id = num; | |
3291 | mutex_unlock(&fsg_opts->lock); | |
3292 | ||
3293 | config_group_init_type_name(&opts->group, name, &fsg_lun_type); | |
3294 | ||
3295 | return &opts->group; | |
3296 | out: | |
3297 | mutex_unlock(&fsg_opts->lock); | |
3298 | return ERR_PTR(ret); | |
3299 | } | |
3300 | ||
3301 | static void fsg_lun_drop(struct config_group *group, struct config_item *item) | |
3302 | { | |
3303 | struct fsg_lun_opts *lun_opts; | |
3304 | struct fsg_opts *fsg_opts; | |
3305 | ||
3306 | lun_opts = to_fsg_lun_opts(item); | |
3307 | fsg_opts = to_fsg_opts(&group->cg_item); | |
3308 | ||
3309 | mutex_lock(&fsg_opts->lock); | |
3310 | if (fsg_opts->refcnt) { | |
3311 | struct config_item *gadget; | |
3312 | ||
3313 | gadget = group->cg_item.ci_parent->ci_parent; | |
3314 | unregister_gadget_item(gadget); | |
3315 | } | |
3316 | ||
5542f58c | 3317 | fsg_common_remove_lun(lun_opts->lun); |
ef0aa4b9 AP |
3318 | fsg_opts->common->luns[lun_opts->lun_id] = NULL; |
3319 | lun_opts->lun_id = 0; | |
3320 | mutex_unlock(&fsg_opts->lock); | |
3321 | ||
3322 | config_item_put(item); | |
3323 | } | |
3324 | ||
ef0aa4b9 AP |
3325 | static void fsg_attr_release(struct config_item *item) |
3326 | { | |
3327 | struct fsg_opts *opts = to_fsg_opts(item); | |
3328 | ||
3329 | usb_put_function_instance(&opts->func_inst); | |
3330 | } | |
3331 | ||
3332 | static struct configfs_item_operations fsg_item_ops = { | |
5bb7289d | 3333 | .release = fsg_attr_release, |
ef0aa4b9 AP |
3334 | }; |
3335 | ||
4a90cb20 | 3336 | static ssize_t fsg_opts_stall_show(struct config_item *item, char *page) |
ef0aa4b9 | 3337 | { |
4a90cb20 | 3338 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3339 | int result; |
3340 | ||
3341 | mutex_lock(&opts->lock); | |
3342 | result = sprintf(page, "%d", opts->common->can_stall); | |
3343 | mutex_unlock(&opts->lock); | |
3344 | ||
3345 | return result; | |
3346 | } | |
3347 | ||
4a90cb20 | 3348 | static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page, |
ef0aa4b9 AP |
3349 | size_t len) |
3350 | { | |
4a90cb20 | 3351 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 | 3352 | int ret; |
5bb7289d | 3353 | bool stall; |
ef0aa4b9 AP |
3354 | |
3355 | mutex_lock(&opts->lock); | |
5bb7289d | 3356 | |
ef0aa4b9 | 3357 | if (opts->refcnt) { |
5bb7289d AP |
3358 | mutex_unlock(&opts->lock); |
3359 | return -EBUSY; | |
ef0aa4b9 | 3360 | } |
ef0aa4b9 | 3361 | |
5bb7289d AP |
3362 | ret = strtobool(page, &stall); |
3363 | if (!ret) { | |
3364 | opts->common->can_stall = stall; | |
3365 | ret = len; | |
3366 | } | |
ef0aa4b9 | 3367 | |
ef0aa4b9 | 3368 | mutex_unlock(&opts->lock); |
5bb7289d | 3369 | |
ef0aa4b9 AP |
3370 | return ret; |
3371 | } | |
3372 | ||
4a90cb20 | 3373 | CONFIGFS_ATTR(fsg_opts_, stall); |
ef0aa4b9 AP |
3374 | |
3375 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
4a90cb20 | 3376 | static ssize_t fsg_opts_num_buffers_show(struct config_item *item, char *page) |
ef0aa4b9 | 3377 | { |
4a90cb20 | 3378 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3379 | int result; |
3380 | ||
3381 | mutex_lock(&opts->lock); | |
3382 | result = sprintf(page, "%d", opts->common->fsg_num_buffers); | |
3383 | mutex_unlock(&opts->lock); | |
3384 | ||
3385 | return result; | |
3386 | } | |
3387 | ||
4a90cb20 | 3388 | static ssize_t fsg_opts_num_buffers_store(struct config_item *item, |
ef0aa4b9 AP |
3389 | const char *page, size_t len) |
3390 | { | |
4a90cb20 | 3391 | struct fsg_opts *opts = to_fsg_opts(item); |
ef0aa4b9 AP |
3392 | int ret; |
3393 | u8 num; | |
3394 | ||
3395 | mutex_lock(&opts->lock); | |
3396 | if (opts->refcnt) { | |
3397 | ret = -EBUSY; | |
3398 | goto end; | |
3399 | } | |
3400 | ret = kstrtou8(page, 0, &num); | |
3401 | if (ret) | |
3402 | goto end; | |
3403 | ||
ef0aa4b9 AP |
3404 | fsg_common_set_num_buffers(opts->common, num); |
3405 | ret = len; | |
3406 | ||
3407 | end: | |
3408 | mutex_unlock(&opts->lock); | |
3409 | return ret; | |
3410 | } | |
3411 | ||
4a90cb20 | 3412 | CONFIGFS_ATTR(fsg_opts_, num_buffers); |
ef0aa4b9 AP |
3413 | #endif |
3414 | ||
3415 | static struct configfs_attribute *fsg_attrs[] = { | |
4a90cb20 | 3416 | &fsg_opts_attr_stall, |
ef0aa4b9 | 3417 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES |
4a90cb20 | 3418 | &fsg_opts_attr_num_buffers, |
ef0aa4b9 AP |
3419 | #endif |
3420 | NULL, | |
3421 | }; | |
3422 | ||
3423 | static struct configfs_group_operations fsg_group_ops = { | |
3424 | .make_group = fsg_lun_make, | |
3425 | .drop_item = fsg_lun_drop, | |
3426 | }; | |
3427 | ||
3428 | static struct config_item_type fsg_func_type = { | |
3429 | .ct_item_ops = &fsg_item_ops, | |
3430 | .ct_group_ops = &fsg_group_ops, | |
3431 | .ct_attrs = fsg_attrs, | |
3432 | .ct_owner = THIS_MODULE, | |
3433 | }; | |
3434 | ||
e5eaa0dc AP |
3435 | static void fsg_free_inst(struct usb_function_instance *fi) |
3436 | { | |
3437 | struct fsg_opts *opts; | |
3438 | ||
3439 | opts = fsg_opts_from_func_inst(fi); | |
3440 | fsg_common_put(opts->common); | |
3441 | kfree(opts); | |
3442 | } | |
3443 | ||
3444 | static struct usb_function_instance *fsg_alloc_inst(void) | |
3445 | { | |
3446 | struct fsg_opts *opts; | |
ef0aa4b9 | 3447 | struct fsg_lun_config config; |
e5eaa0dc AP |
3448 | int rc; |
3449 | ||
3450 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3451 | if (!opts) | |
3452 | return ERR_PTR(-ENOMEM); | |
ef0aa4b9 | 3453 | mutex_init(&opts->lock); |
e5eaa0dc | 3454 | opts->func_inst.free_func_inst = fsg_free_inst; |
7a93d040 | 3455 | opts->common = fsg_common_setup(opts->common); |
e5eaa0dc AP |
3456 | if (IS_ERR(opts->common)) { |
3457 | rc = PTR_ERR(opts->common); | |
3458 | goto release_opts; | |
3459 | } | |
e5eaa0dc AP |
3460 | |
3461 | rc = fsg_common_set_num_buffers(opts->common, | |
3462 | CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS); | |
3463 | if (rc) | |
dd02ea5a | 3464 | goto release_opts; |
e5eaa0dc AP |
3465 | |
3466 | pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); | |
3467 | ||
ef0aa4b9 AP |
3468 | memset(&config, 0, sizeof(config)); |
3469 | config.removable = true; | |
3470 | rc = fsg_common_create_lun(opts->common, &config, 0, "lun.0", | |
3471 | (const char **)&opts->func_inst.group.cg_item.ci_name); | |
903588a9 KO |
3472 | if (rc) |
3473 | goto release_buffers; | |
3474 | ||
ef0aa4b9 AP |
3475 | opts->lun0.lun = opts->common->luns[0]; |
3476 | opts->lun0.lun_id = 0; | |
ef0aa4b9 AP |
3477 | |
3478 | config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type); | |
3479 | ||
1ae1602d CH |
3480 | config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type); |
3481 | configfs_add_default_group(&opts->lun0.group, &opts->func_inst.group); | |
3482 | ||
e5eaa0dc AP |
3483 | return &opts->func_inst; |
3484 | ||
903588a9 KO |
3485 | release_buffers: |
3486 | fsg_common_free_buffers(opts->common); | |
e5eaa0dc AP |
3487 | release_opts: |
3488 | kfree(opts); | |
3489 | return ERR_PTR(rc); | |
3490 | } | |
3491 | ||
3492 | static void fsg_free(struct usb_function *f) | |
3493 | { | |
3494 | struct fsg_dev *fsg; | |
ef0aa4b9 | 3495 | struct fsg_opts *opts; |
e5eaa0dc AP |
3496 | |
3497 | fsg = container_of(f, struct fsg_dev, function); | |
ef0aa4b9 AP |
3498 | opts = container_of(f->fi, struct fsg_opts, func_inst); |
3499 | ||
3500 | mutex_lock(&opts->lock); | |
3501 | opts->refcnt--; | |
3502 | mutex_unlock(&opts->lock); | |
e5eaa0dc AP |
3503 | |
3504 | kfree(fsg); | |
3505 | } | |
3506 | ||
3507 | static struct usb_function *fsg_alloc(struct usb_function_instance *fi) | |
3508 | { | |
3509 | struct fsg_opts *opts = fsg_opts_from_func_inst(fi); | |
3510 | struct fsg_common *common = opts->common; | |
3511 | struct fsg_dev *fsg; | |
3512 | ||
3513 | fsg = kzalloc(sizeof(*fsg), GFP_KERNEL); | |
3514 | if (unlikely(!fsg)) | |
3515 | return ERR_PTR(-ENOMEM); | |
3516 | ||
ef0aa4b9 AP |
3517 | mutex_lock(&opts->lock); |
3518 | opts->refcnt++; | |
3519 | mutex_unlock(&opts->lock); | |
8515bac0 | 3520 | |
e5eaa0dc AP |
3521 | fsg->function.name = FSG_DRIVER_DESC; |
3522 | fsg->function.bind = fsg_bind; | |
3523 | fsg->function.unbind = fsg_unbind; | |
3524 | fsg->function.setup = fsg_setup; | |
3525 | fsg->function.set_alt = fsg_set_alt; | |
3526 | fsg->function.disable = fsg_disable; | |
3527 | fsg->function.free_func = fsg_free; | |
3528 | ||
3529 | fsg->common = common; | |
3530 | ||
3531 | return &fsg->function; | |
3532 | } | |
3533 | ||
3534 | DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc); | |
3535 | MODULE_LICENSE("GPL"); | |
3536 | MODULE_AUTHOR("Michal Nazarewicz"); | |
3537 | ||
481e4929 MN |
3538 | /************************* Module parameters *************************/ |
3539 | ||
6fdc5dd2 | 3540 | |
f3fed367 | 3541 | void fsg_config_from_params(struct fsg_config *cfg, |
6fdc5dd2 AP |
3542 | const struct fsg_module_parameters *params, |
3543 | unsigned int fsg_num_buffers) | |
481e4929 MN |
3544 | { |
3545 | struct fsg_lun_config *lun; | |
d26a6aa0 | 3546 | unsigned i; |
481e4929 MN |
3547 | |
3548 | /* Configure LUNs */ | |
d26a6aa0 MN |
3549 | cfg->nluns = |
3550 | min(params->luns ?: (params->file_count ?: 1u), | |
3551 | (unsigned)FSG_MAX_LUNS); | |
3552 | for (i = 0, lun = cfg->luns; i < cfg->nluns; ++i, ++lun) { | |
481e4929 MN |
3553 | lun->ro = !!params->ro[i]; |
3554 | lun->cdrom = !!params->cdrom[i]; | |
fa84c575 | 3555 | lun->removable = !!params->removable[i]; |
481e4929 MN |
3556 | lun->filename = |
3557 | params->file_count > i && params->file[i][0] | |
3558 | ? params->file[i] | |
136c489b | 3559 | : NULL; |
481e4929 MN |
3560 | } |
3561 | ||
d26a6aa0 | 3562 | /* Let MSF use defaults */ |
136c489b JH |
3563 | cfg->vendor_name = NULL; |
3564 | cfg->product_name = NULL; | |
481e4929 | 3565 | |
8876f5e7 MN |
3566 | cfg->ops = NULL; |
3567 | cfg->private_data = NULL; | |
c85efcb9 | 3568 | |
481e4929 MN |
3569 | /* Finalise */ |
3570 | cfg->can_stall = params->stall; | |
6fdc5dd2 | 3571 | cfg->fsg_num_buffers = fsg_num_buffers; |
481e4929 | 3572 | } |
7a93d040 | 3573 | EXPORT_SYMBOL_GPL(fsg_config_from_params); |