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1da177e4 LT |
1 | /* |
2 | * file_storage.c -- File-backed USB Storage Gadget, for USB development | |
3 | * | |
12aae68a | 4 | * Copyright (C) 2003-2008 Alan Stern |
1da177e4 LT |
5 | * All rights reserved. |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions, and the following disclaimer, | |
12 | * without modification. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. The names of the above-listed copyright holders may not be used | |
17 | * to endorse or promote products derived from this software without | |
18 | * specific prior written permission. | |
19 | * | |
20 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
21 | * GNU General Public License ("GPL") as published by the Free Software | |
22 | * Foundation, either version 2 of that License or (at your option) any | |
23 | * later version. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
26 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
27 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
28 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
29 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
31 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
32 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
36 | */ | |
37 | ||
38 | ||
39 | /* | |
40 | * The File-backed Storage Gadget acts as a USB Mass Storage device, | |
12aae68a AS |
41 | * appearing to the host as a disk drive or as a CD-ROM drive. In addition |
42 | * to providing an example of a genuinely useful gadget driver for a USB | |
43 | * device, it also illustrates a technique of double-buffering for increased | |
44 | * throughput. Last but not least, it gives an easy way to probe the | |
45 | * behavior of the Mass Storage drivers in a USB host. | |
1da177e4 LT |
46 | * |
47 | * Backing storage is provided by a regular file or a block device, specified | |
48 | * by the "file" module parameter. Access can be limited to read-only by | |
12aae68a AS |
49 | * setting the optional "ro" module parameter. (For CD-ROM emulation, |
50 | * access is always read-only.) The gadget will indicate that it has | |
51 | * removable media if the optional "removable" module parameter is set. | |
1da177e4 LT |
52 | * |
53 | * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI), | |
54 | * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected | |
55 | * by the optional "transport" module parameter. It also supports the | |
56 | * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03), | |
57 | * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by | |
58 | * the optional "protocol" module parameter. In addition, the default | |
87eb1bea | 59 | * Vendor ID, Product ID, release number and serial number can be overridden. |
1da177e4 LT |
60 | * |
61 | * There is support for multiple logical units (LUNs), each of which has | |
62 | * its own backing file. The number of LUNs can be set using the optional | |
63 | * "luns" module parameter (anywhere from 1 to 8), and the corresponding | |
64 | * files are specified using comma-separated lists for "file" and "ro". | |
65 | * The default number of LUNs is taken from the number of "file" elements; | |
66 | * it is 1 if "file" is not given. If "removable" is not set then a backing | |
67 | * file must be specified for each LUN. If it is set, then an unspecified | |
12aae68a AS |
68 | * or empty backing filename means the LUN's medium is not loaded. Ideally |
69 | * each LUN would be settable independently as a disk drive or a CD-ROM | |
70 | * drive, but currently all LUNs have to be the same type. The CD-ROM | |
71 | * emulation includes a single data track and no audio tracks; hence there | |
72 | * need be only one backing file per LUN. Note also that the CD-ROM block | |
73 | * length is set to 512 rather than the more common value 2048. | |
1da177e4 LT |
74 | * |
75 | * Requirements are modest; only a bulk-in and a bulk-out endpoint are | |
76 | * needed (an interrupt-out endpoint is also needed for CBI). The memory | |
77 | * requirement amounts to two 16K buffers, size configurable by a parameter. | |
78 | * Support is included for both full-speed and high-speed operation. | |
79 | * | |
14cd5f8e AS |
80 | * Note that the driver is slightly non-portable in that it assumes a |
81 | * single memory/DMA buffer will be useable for bulk-in, bulk-out, and | |
82 | * interrupt-in endpoints. With most device controllers this isn't an | |
83 | * issue, but there may be some with hardware restrictions that prevent | |
84 | * a buffer from being used by more than one endpoint. | |
85 | * | |
1da177e4 LT |
86 | * Module options: |
87 | * | |
88 | * file=filename[,filename...] | |
89 | * Required if "removable" is not set, names of | |
90 | * the files or block devices used for | |
91 | * backing storage | |
92 | * ro=b[,b...] Default false, booleans for read-only access | |
93 | * removable Default false, boolean for removable media | |
94 | * luns=N Default N = number of filenames, number of | |
95 | * LUNs to support | |
a93917d3 AS |
96 | * nofua=b[,b...] Default false, booleans for ignore FUA flag |
97 | * in SCSI WRITE(10,12) commands | |
d794ac7a AS |
98 | * stall Default determined according to the type of |
99 | * USB device controller (usually true), | |
100 | * boolean to permit the driver to halt | |
101 | * bulk endpoints | |
12aae68a AS |
102 | * cdrom Default false, boolean for whether to emulate |
103 | * a CD-ROM drive | |
1da177e4 LT |
104 | * transport=XXX Default BBB, transport name (CB, CBI, or BBB) |
105 | * protocol=YYY Default SCSI, protocol name (RBC, 8020 or | |
106 | * ATAPI, QIC, UFI, 8070, or SCSI; | |
107 | * also 1 - 6) | |
108 | * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID | |
109 | * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID | |
110 | * release=0xRRRR Override the USB release number (bcdDevice) | |
87eb1bea | 111 | * serial=HHHH... Override serial number (string of hex chars) |
1da177e4 LT |
112 | * buflen=N Default N=16384, buffer size used (will be |
113 | * rounded down to a multiple of | |
114 | * PAGE_CACHE_SIZE) | |
1da177e4 LT |
115 | * |
116 | * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro", | |
a93917d3 AS |
117 | * "removable", "luns", "nofua", "stall", and "cdrom" options are available; |
118 | * default values are used for everything else. | |
1da177e4 LT |
119 | * |
120 | * The pathnames of the backing files and the ro settings are available in | |
a93917d3 AS |
121 | * the attribute files "file", "nofua", and "ro" in the lun<n> subdirectory of |
122 | * the gadget's sysfs directory. If the "removable" option is set, writing to | |
1da177e4 LT |
123 | * these files will simulate ejecting/loading the medium (writing an empty |
124 | * line means eject) and adjusting a write-enable tab. Changes to the ro | |
12aae68a AS |
125 | * setting are not allowed when the medium is loaded or if CD-ROM emulation |
126 | * is being used. | |
1da177e4 LT |
127 | * |
128 | * This gadget driver is heavily based on "Gadget Zero" by David Brownell. | |
aafe5bd6 AS |
129 | * The driver's SCSI command interface was based on the "Information |
130 | * technology - Small Computer System Interface - 2" document from | |
131 | * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at | |
132 | * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception | |
133 | * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the | |
134 | * "Universal Serial Bus Mass Storage Class UFI Command Specification" | |
135 | * document, Revision 1.0, December 14, 1998, available at | |
136 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>. | |
1da177e4 LT |
137 | */ |
138 | ||
139 | ||
140 | /* | |
141 | * Driver Design | |
142 | * | |
143 | * The FSG driver is fairly straightforward. There is a main kernel | |
144 | * thread that handles most of the work. Interrupt routines field | |
145 | * callbacks from the controller driver: bulk- and interrupt-request | |
146 | * completion notifications, endpoint-0 events, and disconnect events. | |
147 | * Completion events are passed to the main thread by wakeup calls. Many | |
148 | * ep0 requests are handled at interrupt time, but SetInterface, | |
149 | * SetConfiguration, and device reset requests are forwarded to the | |
150 | * thread in the form of "exceptions" using SIGUSR1 signals (since they | |
151 | * should interrupt any ongoing file I/O operations). | |
152 | * | |
153 | * The thread's main routine implements the standard command/data/status | |
154 | * parts of a SCSI interaction. It and its subroutines are full of tests | |
155 | * for pending signals/exceptions -- all this polling is necessary since | |
156 | * the kernel has no setjmp/longjmp equivalents. (Maybe this is an | |
157 | * indication that the driver really wants to be running in userspace.) | |
158 | * An important point is that so long as the thread is alive it keeps an | |
159 | * open reference to the backing file. This will prevent unmounting | |
160 | * the backing file's underlying filesystem and could cause problems | |
161 | * during system shutdown, for example. To prevent such problems, the | |
162 | * thread catches INT, TERM, and KILL signals and converts them into | |
163 | * an EXIT exception. | |
164 | * | |
165 | * In normal operation the main thread is started during the gadget's | |
166 | * fsg_bind() callback and stopped during fsg_unbind(). But it can also | |
167 | * exit when it receives a signal, and there's no point leaving the | |
168 | * gadget running when the thread is dead. So just before the thread | |
169 | * exits, it deregisters the gadget driver. This makes things a little | |
170 | * tricky: The driver is deregistered at two places, and the exiting | |
171 | * thread can indirectly call fsg_unbind() which in turn can tell the | |
172 | * thread to exit. The first problem is resolved through the use of the | |
173 | * REGISTERED atomic bitflag; the driver will only be deregistered once. | |
174 | * The second problem is resolved by having fsg_unbind() check | |
175 | * fsg->state; it won't try to stop the thread if the state is already | |
176 | * FSG_STATE_TERMINATED. | |
177 | * | |
178 | * To provide maximum throughput, the driver uses a circular pipeline of | |
179 | * buffer heads (struct fsg_buffhd). In principle the pipeline can be | |
180 | * arbitrarily long; in practice the benefits don't justify having more | |
181 | * than 2 stages (i.e., double buffering). But it helps to think of the | |
182 | * pipeline as being a long one. Each buffer head contains a bulk-in and | |
183 | * a bulk-out request pointer (since the buffer can be used for both | |
184 | * output and input -- directions always are given from the host's | |
185 | * point of view) as well as a pointer to the buffer and various state | |
186 | * variables. | |
187 | * | |
188 | * Use of the pipeline follows a simple protocol. There is a variable | |
189 | * (fsg->next_buffhd_to_fill) that points to the next buffer head to use. | |
190 | * At any time that buffer head may still be in use from an earlier | |
191 | * request, so each buffer head has a state variable indicating whether | |
192 | * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the | |
193 | * buffer head to be EMPTY, filling the buffer either by file I/O or by | |
194 | * USB I/O (during which the buffer head is BUSY), and marking the buffer | |
195 | * head FULL when the I/O is complete. Then the buffer will be emptied | |
196 | * (again possibly by USB I/O, during which it is marked BUSY) and | |
197 | * finally marked EMPTY again (possibly by a completion routine). | |
198 | * | |
199 | * A module parameter tells the driver to avoid stalling the bulk | |
200 | * endpoints wherever the transport specification allows. This is | |
201 | * necessary for some UDCs like the SuperH, which cannot reliably clear a | |
202 | * halt on a bulk endpoint. However, under certain circumstances the | |
203 | * Bulk-only specification requires a stall. In such cases the driver | |
204 | * will halt the endpoint and set a flag indicating that it should clear | |
205 | * the halt in software during the next device reset. Hopefully this | |
206 | * will permit everything to work correctly. Furthermore, although the | |
207 | * specification allows the bulk-out endpoint to halt when the host sends | |
208 | * too much data, implementing this would cause an unavoidable race. | |
209 | * The driver will always use the "no-stall" approach for OUT transfers. | |
210 | * | |
211 | * One subtle point concerns sending status-stage responses for ep0 | |
212 | * requests. Some of these requests, such as device reset, can involve | |
213 | * interrupting an ongoing file I/O operation, which might take an | |
214 | * arbitrarily long time. During that delay the host might give up on | |
215 | * the original ep0 request and issue a new one. When that happens the | |
216 | * driver should not notify the host about completion of the original | |
217 | * request, as the host will no longer be waiting for it. So the driver | |
218 | * assigns to each ep0 request a unique tag, and it keeps track of the | |
219 | * tag value of the request associated with a long-running exception | |
220 | * (device-reset, interface-change, or configuration-change). When the | |
221 | * exception handler is finished, the status-stage response is submitted | |
222 | * only if the current ep0 request tag is equal to the exception request | |
223 | * tag. Thus only the most recently received ep0 request will get a | |
224 | * status-stage response. | |
225 | * | |
226 | * Warning: This driver source file is too long. It ought to be split up | |
227 | * into a header file plus about 3 separate .c files, to handle the details | |
228 | * of the Gadget, USB Mass Storage, and SCSI protocols. | |
229 | */ | |
230 | ||
231 | ||
2e806f67 | 232 | /* #define VERBOSE_DEBUG */ |
79a7d9ee | 233 | /* #define DUMP_MSGS */ |
1da177e4 | 234 | |
1da177e4 | 235 | |
1da177e4 | 236 | #include <linux/blkdev.h> |
1da177e4 LT |
237 | #include <linux/completion.h> |
238 | #include <linux/dcache.h> | |
239 | #include <linux/delay.h> | |
240 | #include <linux/device.h> | |
241 | #include <linux/fcntl.h> | |
242 | #include <linux/file.h> | |
243 | #include <linux/fs.h> | |
87c4252a | 244 | #include <linux/kref.h> |
22efcf4a | 245 | #include <linux/kthread.h> |
1da177e4 | 246 | #include <linux/limits.h> |
1da177e4 | 247 | #include <linux/rwsem.h> |
1da177e4 LT |
248 | #include <linux/slab.h> |
249 | #include <linux/spinlock.h> | |
250 | #include <linux/string.h> | |
7dfb7103 | 251 | #include <linux/freezer.h> |
1da177e4 | 252 | #include <linux/utsname.h> |
1da177e4 | 253 | |
5f848137 | 254 | #include <linux/usb/ch9.h> |
9454a57a | 255 | #include <linux/usb/gadget.h> |
1da177e4 LT |
256 | |
257 | #include "gadget_chips.h" | |
258 | ||
259 | ||
352e2b96 DB |
260 | |
261 | /* | |
262 | * Kbuild is not very cooperative with respect to linking separately | |
263 | * compiled library objects into one module. So for now we won't use | |
264 | * separate compilation ... ensuring init/exit sections work to shrink | |
265 | * the runtime footprint, and giving us at least some parts of what | |
266 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
267 | */ | |
268 | #include "usbstring.c" | |
269 | #include "config.c" | |
270 | #include "epautoconf.c" | |
271 | ||
1da177e4 LT |
272 | /*-------------------------------------------------------------------------*/ |
273 | ||
274 | #define DRIVER_DESC "File-backed Storage Gadget" | |
275 | #define DRIVER_NAME "g_file_storage" | |
87eb1bea YC |
276 | /* DRIVER_VERSION must be at least 6 characters long, as it is used |
277 | * to generate a fallback serial number. */ | |
12aae68a | 278 | #define DRIVER_VERSION "20 November 2008" |
1da177e4 | 279 | |
d6181702 MN |
280 | static char fsg_string_manufacturer[64]; |
281 | static const char fsg_string_product[] = DRIVER_DESC; | |
282 | static char fsg_string_serial[13]; | |
283 | static const char fsg_string_config[] = "Self-powered"; | |
284 | static const char fsg_string_interface[] = "Mass Storage"; | |
1da177e4 | 285 | |
93f93740 MN |
286 | |
287 | #include "storage_common.c" | |
288 | ||
289 | ||
1da177e4 LT |
290 | MODULE_DESCRIPTION(DRIVER_DESC); |
291 | MODULE_AUTHOR("Alan Stern"); | |
292 | MODULE_LICENSE("Dual BSD/GPL"); | |
293 | ||
1da177e4 LT |
294 | /* |
295 | * This driver assumes self-powered hardware and has no way for users to | |
296 | * trigger remote wakeup. It uses autoconfiguration to select endpoints | |
297 | * and endpoint addresses. | |
298 | */ | |
299 | ||
300 | ||
301 | /*-------------------------------------------------------------------------*/ | |
302 | ||
1da177e4 LT |
303 | |
304 | /* Encapsulate the module parameter settings */ | |
305 | ||
1da177e4 | 306 | static struct { |
d6181702 MN |
307 | char *file[FSG_MAX_LUNS]; |
308 | int ro[FSG_MAX_LUNS]; | |
a93917d3 | 309 | int nofua[FSG_MAX_LUNS]; |
2e806f67 DB |
310 | unsigned int num_filenames; |
311 | unsigned int num_ros; | |
a93917d3 | 312 | unsigned int num_nofuas; |
1da177e4 LT |
313 | unsigned int nluns; |
314 | ||
d794ac7a AS |
315 | int removable; |
316 | int can_stall; | |
12aae68a | 317 | int cdrom; |
d794ac7a | 318 | |
1da177e4 LT |
319 | char *transport_parm; |
320 | char *protocol_parm; | |
1da177e4 LT |
321 | unsigned short vendor; |
322 | unsigned short product; | |
323 | unsigned short release; | |
56706491 | 324 | char *serial; |
1da177e4 | 325 | unsigned int buflen; |
1da177e4 LT |
326 | |
327 | int transport_type; | |
328 | char *transport_name; | |
329 | int protocol_type; | |
330 | char *protocol_name; | |
331 | ||
332 | } mod_data = { // Default values | |
333 | .transport_parm = "BBB", | |
334 | .protocol_parm = "SCSI", | |
335 | .removable = 0, | |
d794ac7a | 336 | .can_stall = 1, |
12aae68a | 337 | .cdrom = 0, |
d6181702 MN |
338 | .vendor = FSG_VENDOR_ID, |
339 | .product = FSG_PRODUCT_ID, | |
1da177e4 LT |
340 | .release = 0xffff, // Use controller chip type |
341 | .buflen = 16384, | |
1da177e4 LT |
342 | }; |
343 | ||
344 | ||
aafe5bd6 AS |
345 | module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames, |
346 | S_IRUGO); | |
1da177e4 LT |
347 | MODULE_PARM_DESC(file, "names of backing files or devices"); |
348 | ||
aafe5bd6 | 349 | module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO); |
1da177e4 LT |
350 | MODULE_PARM_DESC(ro, "true to force read-only"); |
351 | ||
a93917d3 AS |
352 | module_param_array_named(nofua, mod_data.nofua, bool, &mod_data.num_nofuas, |
353 | S_IRUGO); | |
354 | MODULE_PARM_DESC(nofua, "true to ignore SCSI WRITE(10,12) FUA bit"); | |
355 | ||
1da177e4 LT |
356 | module_param_named(luns, mod_data.nluns, uint, S_IRUGO); |
357 | MODULE_PARM_DESC(luns, "number of LUNs"); | |
358 | ||
359 | module_param_named(removable, mod_data.removable, bool, S_IRUGO); | |
360 | MODULE_PARM_DESC(removable, "true to simulate removable media"); | |
361 | ||
d794ac7a AS |
362 | module_param_named(stall, mod_data.can_stall, bool, S_IRUGO); |
363 | MODULE_PARM_DESC(stall, "false to prevent bulk stalls"); | |
364 | ||
12aae68a AS |
365 | module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO); |
366 | MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk"); | |
367 | ||
56706491 MN |
368 | module_param_named(serial, mod_data.serial, charp, S_IRUGO); |
369 | MODULE_PARM_DESC(serial, "USB serial number"); | |
1da177e4 LT |
370 | |
371 | /* In the non-TEST version, only the module parameters listed above | |
372 | * are available. */ | |
373 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
374 | ||
375 | module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO); | |
376 | MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)"); | |
377 | ||
378 | module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO); | |
379 | MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, " | |
380 | "8070, or SCSI)"); | |
381 | ||
382 | module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO); | |
383 | MODULE_PARM_DESC(vendor, "USB Vendor ID"); | |
384 | ||
385 | module_param_named(product, mod_data.product, ushort, S_IRUGO); | |
386 | MODULE_PARM_DESC(product, "USB Product ID"); | |
387 | ||
388 | module_param_named(release, mod_data.release, ushort, S_IRUGO); | |
389 | MODULE_PARM_DESC(release, "USB release number"); | |
390 | ||
391 | module_param_named(buflen, mod_data.buflen, uint, S_IRUGO); | |
392 | MODULE_PARM_DESC(buflen, "I/O buffer size"); | |
393 | ||
1da177e4 LT |
394 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ |
395 | ||
396 | ||
1da177e4 LT |
397 | /* |
398 | * These definitions will permit the compiler to avoid generating code for | |
399 | * parts of the driver that aren't used in the non-TEST version. Even gcc | |
400 | * can recognize when a test of a constant expression yields a dead code | |
401 | * path. | |
402 | */ | |
403 | ||
404 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
405 | ||
406 | #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK) | |
407 | #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI) | |
408 | #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI) | |
409 | ||
410 | #else | |
411 | ||
412 | #define transport_is_bbb() 1 | |
413 | #define transport_is_cbi() 0 | |
414 | #define protocol_is_scsi() 1 | |
415 | ||
416 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
417 | ||
418 | ||
b6058d0f | 419 | /*-------------------------------------------------------------------------*/ |
1da177e4 | 420 | |
1da177e4 LT |
421 | |
422 | struct fsg_dev { | |
423 | /* lock protects: state, all the req_busy's, and cbbuf_cmnd */ | |
424 | spinlock_t lock; | |
425 | struct usb_gadget *gadget; | |
426 | ||
427 | /* filesem protects: backing files in use */ | |
428 | struct rw_semaphore filesem; | |
429 | ||
87c4252a AS |
430 | /* reference counting: wait until all LUNs are released */ |
431 | struct kref ref; | |
432 | ||
1da177e4 LT |
433 | struct usb_ep *ep0; // Handy copy of gadget->ep0 |
434 | struct usb_request *ep0req; // For control responses | |
a21d4fed | 435 | unsigned int ep0_req_tag; |
1da177e4 LT |
436 | const char *ep0req_name; |
437 | ||
438 | struct usb_request *intreq; // For interrupt responses | |
a21d4fed | 439 | int intreq_busy; |
1da177e4 LT |
440 | struct fsg_buffhd *intr_buffhd; |
441 | ||
d6181702 | 442 | unsigned int bulk_out_maxpacket; |
1da177e4 LT |
443 | enum fsg_state state; // For exception handling |
444 | unsigned int exception_req_tag; | |
445 | ||
446 | u8 config, new_config; | |
447 | ||
448 | unsigned int running : 1; | |
449 | unsigned int bulk_in_enabled : 1; | |
450 | unsigned int bulk_out_enabled : 1; | |
451 | unsigned int intr_in_enabled : 1; | |
452 | unsigned int phase_error : 1; | |
453 | unsigned int short_packet_received : 1; | |
454 | unsigned int bad_lun_okay : 1; | |
455 | ||
456 | unsigned long atomic_bitflags; | |
457 | #define REGISTERED 0 | |
b950bdbc | 458 | #define IGNORE_BULK_OUT 1 |
1da177e4 LT |
459 | #define SUSPENDED 2 |
460 | ||
461 | struct usb_ep *bulk_in; | |
462 | struct usb_ep *bulk_out; | |
463 | struct usb_ep *intr_in; | |
464 | ||
465 | struct fsg_buffhd *next_buffhd_to_fill; | |
466 | struct fsg_buffhd *next_buffhd_to_drain; | |
d6181702 | 467 | struct fsg_buffhd buffhds[FSG_NUM_BUFFERS]; |
1da177e4 | 468 | |
1da177e4 LT |
469 | int thread_wakeup_needed; |
470 | struct completion thread_notifier; | |
1da177e4 | 471 | struct task_struct *thread_task; |
1da177e4 LT |
472 | |
473 | int cmnd_size; | |
474 | u8 cmnd[MAX_COMMAND_SIZE]; | |
475 | enum data_direction data_dir; | |
476 | u32 data_size; | |
477 | u32 data_size_from_cmnd; | |
478 | u32 tag; | |
479 | unsigned int lun; | |
480 | u32 residue; | |
481 | u32 usb_amount_left; | |
482 | ||
483 | /* The CB protocol offers no way for a host to know when a command | |
484 | * has completed. As a result the next command may arrive early, | |
485 | * and we will still have to handle it. For that reason we need | |
486 | * a buffer to store new commands when using CB (or CBI, which | |
487 | * does not oblige a host to wait for command completion either). */ | |
488 | int cbbuf_cmnd_size; | |
489 | u8 cbbuf_cmnd[MAX_COMMAND_SIZE]; | |
490 | ||
491 | unsigned int nluns; | |
d6181702 MN |
492 | struct fsg_lun *luns; |
493 | struct fsg_lun *curlun; | |
1da177e4 LT |
494 | }; |
495 | ||
496 | typedef void (*fsg_routine_t)(struct fsg_dev *); | |
497 | ||
79a7d9ee | 498 | static int exception_in_progress(struct fsg_dev *fsg) |
1da177e4 LT |
499 | { |
500 | return (fsg->state > FSG_STATE_IDLE); | |
501 | } | |
502 | ||
503 | /* Make bulk-out requests be divisible by the maxpacket size */ | |
79a7d9ee | 504 | static void set_bulk_out_req_length(struct fsg_dev *fsg, |
1da177e4 LT |
505 | struct fsg_buffhd *bh, unsigned int length) |
506 | { | |
507 | unsigned int rem; | |
508 | ||
509 | bh->bulk_out_intended_length = length; | |
510 | rem = length % fsg->bulk_out_maxpacket; | |
511 | if (rem > 0) | |
512 | length += fsg->bulk_out_maxpacket - rem; | |
513 | bh->outreq->length = length; | |
514 | } | |
515 | ||
516 | static struct fsg_dev *the_fsg; | |
517 | static struct usb_gadget_driver fsg_driver; | |
518 | ||
1da177e4 LT |
519 | |
520 | /*-------------------------------------------------------------------------*/ | |
521 | ||
1da177e4 LT |
522 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) |
523 | { | |
524 | const char *name; | |
525 | ||
526 | if (ep == fsg->bulk_in) | |
527 | name = "bulk-in"; | |
528 | else if (ep == fsg->bulk_out) | |
529 | name = "bulk-out"; | |
530 | else | |
531 | name = ep->name; | |
532 | DBG(fsg, "%s set halt\n", name); | |
533 | return usb_ep_set_halt(ep); | |
534 | } | |
535 | ||
536 | ||
1da177e4 LT |
537 | /*-------------------------------------------------------------------------*/ |
538 | ||
539 | /* | |
540 | * DESCRIPTORS ... most are static, but strings and (full) configuration | |
541 | * descriptors are built on demand. Also the (static) config and interface | |
542 | * descriptors are adjusted during fsg_bind(). | |
543 | */ | |
1da177e4 LT |
544 | |
545 | /* There is only one configuration. */ | |
546 | #define CONFIG_VALUE 1 | |
547 | ||
548 | static struct usb_device_descriptor | |
549 | device_desc = { | |
550 | .bLength = sizeof device_desc, | |
551 | .bDescriptorType = USB_DT_DEVICE, | |
552 | ||
551509d2 | 553 | .bcdUSB = cpu_to_le16(0x0200), |
1da177e4 LT |
554 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
555 | ||
556 | /* The next three values can be overridden by module parameters */ | |
d6181702 MN |
557 | .idVendor = cpu_to_le16(FSG_VENDOR_ID), |
558 | .idProduct = cpu_to_le16(FSG_PRODUCT_ID), | |
551509d2 | 559 | .bcdDevice = cpu_to_le16(0xffff), |
1da177e4 | 560 | |
d6181702 MN |
561 | .iManufacturer = FSG_STRING_MANUFACTURER, |
562 | .iProduct = FSG_STRING_PRODUCT, | |
563 | .iSerialNumber = FSG_STRING_SERIAL, | |
1da177e4 LT |
564 | .bNumConfigurations = 1, |
565 | }; | |
566 | ||
567 | static struct usb_config_descriptor | |
568 | config_desc = { | |
569 | .bLength = sizeof config_desc, | |
570 | .bDescriptorType = USB_DT_CONFIG, | |
571 | ||
572 | /* wTotalLength computed by usb_gadget_config_buf() */ | |
573 | .bNumInterfaces = 1, | |
574 | .bConfigurationValue = CONFIG_VALUE, | |
d6181702 | 575 | .iConfiguration = FSG_STRING_CONFIG, |
1da177e4 | 576 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, |
36e893d2 | 577 | .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2, |
1da177e4 LT |
578 | }; |
579 | ||
1da177e4 | 580 | |
1da177e4 LT |
581 | static struct usb_qualifier_descriptor |
582 | dev_qualifier = { | |
583 | .bLength = sizeof dev_qualifier, | |
584 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
585 | ||
551509d2 | 586 | .bcdUSB = cpu_to_le16(0x0200), |
1da177e4 LT |
587 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
588 | ||
589 | .bNumConfigurations = 1, | |
590 | }; | |
591 | ||
1da177e4 LT |
592 | |
593 | ||
594 | /* | |
595 | * Config descriptors must agree with the code that sets configurations | |
596 | * and with code managing interfaces and their altsettings. They must | |
597 | * also handle different speeds and other-speed requests. | |
598 | */ | |
599 | static int populate_config_buf(struct usb_gadget *gadget, | |
600 | u8 *buf, u8 type, unsigned index) | |
601 | { | |
1da177e4 | 602 | enum usb_device_speed speed = gadget->speed; |
1da177e4 LT |
603 | int len; |
604 | const struct usb_descriptor_header **function; | |
605 | ||
606 | if (index > 0) | |
607 | return -EINVAL; | |
608 | ||
2e806f67 | 609 | if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG) |
1da177e4 | 610 | speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed; |
d23b0f08 MN |
611 | function = gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH |
612 | ? (const struct usb_descriptor_header **)fsg_hs_function | |
613 | : (const struct usb_descriptor_header **)fsg_fs_function; | |
1da177e4 LT |
614 | |
615 | /* for now, don't advertise srp-only devices */ | |
2e806f67 | 616 | if (!gadget_is_otg(gadget)) |
1da177e4 LT |
617 | function++; |
618 | ||
619 | len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function); | |
620 | ((struct usb_config_descriptor *) buf)->bDescriptorType = type; | |
621 | return len; | |
622 | } | |
623 | ||
624 | ||
625 | /*-------------------------------------------------------------------------*/ | |
626 | ||
627 | /* These routines may be called in process context or in_irq */ | |
628 | ||
a21d4fed | 629 | /* Caller must hold fsg->lock */ |
1da177e4 LT |
630 | static void wakeup_thread(struct fsg_dev *fsg) |
631 | { | |
632 | /* Tell the main thread that something has happened */ | |
633 | fsg->thread_wakeup_needed = 1; | |
a21d4fed AS |
634 | if (fsg->thread_task) |
635 | wake_up_process(fsg->thread_task); | |
1da177e4 LT |
636 | } |
637 | ||
638 | ||
639 | static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state) | |
640 | { | |
641 | unsigned long flags; | |
1da177e4 LT |
642 | |
643 | /* Do nothing if a higher-priority exception is already in progress. | |
644 | * If a lower-or-equal priority exception is in progress, preempt it | |
645 | * and notify the main thread by sending it a signal. */ | |
646 | spin_lock_irqsave(&fsg->lock, flags); | |
647 | if (fsg->state <= new_state) { | |
648 | fsg->exception_req_tag = fsg->ep0_req_tag; | |
649 | fsg->state = new_state; | |
22efcf4a AS |
650 | if (fsg->thread_task) |
651 | send_sig_info(SIGUSR1, SEND_SIG_FORCED, | |
652 | fsg->thread_task); | |
1da177e4 LT |
653 | } |
654 | spin_unlock_irqrestore(&fsg->lock, flags); | |
655 | } | |
656 | ||
657 | ||
658 | /*-------------------------------------------------------------------------*/ | |
659 | ||
660 | /* The disconnect callback and ep0 routines. These always run in_irq, | |
661 | * except that ep0_queue() is called in the main thread to acknowledge | |
662 | * completion of various requests: set config, set interface, and | |
663 | * Bulk-only device reset. */ | |
664 | ||
665 | static void fsg_disconnect(struct usb_gadget *gadget) | |
666 | { | |
667 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
668 | ||
669 | DBG(fsg, "disconnect or port reset\n"); | |
670 | raise_exception(fsg, FSG_STATE_DISCONNECT); | |
671 | } | |
672 | ||
673 | ||
674 | static int ep0_queue(struct fsg_dev *fsg) | |
675 | { | |
676 | int rc; | |
677 | ||
678 | rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC); | |
679 | if (rc != 0 && rc != -ESHUTDOWN) { | |
680 | ||
681 | /* We can't do much more than wait for a reset */ | |
b6c63937 | 682 | WARNING(fsg, "error in submission: %s --> %d\n", |
1da177e4 LT |
683 | fsg->ep0->name, rc); |
684 | } | |
685 | return rc; | |
686 | } | |
687 | ||
688 | static void ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
689 | { | |
7ca46b86 | 690 | struct fsg_dev *fsg = ep->driver_data; |
1da177e4 LT |
691 | |
692 | if (req->actual > 0) | |
693 | dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual); | |
694 | if (req->status || req->actual != req->length) | |
441b62c1 | 695 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
696 | req->status, req->actual, req->length); |
697 | if (req->status == -ECONNRESET) // Request was cancelled | |
698 | usb_ep_fifo_flush(ep); | |
699 | ||
700 | if (req->status == 0 && req->context) | |
701 | ((fsg_routine_t) (req->context))(fsg); | |
702 | } | |
703 | ||
704 | ||
705 | /*-------------------------------------------------------------------------*/ | |
706 | ||
707 | /* Bulk and interrupt endpoint completion handlers. | |
708 | * These always run in_irq. */ | |
709 | ||
710 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) | |
711 | { | |
7ca46b86 JD |
712 | struct fsg_dev *fsg = ep->driver_data; |
713 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
714 | |
715 | if (req->status || req->actual != req->length) | |
441b62c1 | 716 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
717 | req->status, req->actual, req->length); |
718 | if (req->status == -ECONNRESET) // Request was cancelled | |
719 | usb_ep_fifo_flush(ep); | |
720 | ||
721 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 722 | smp_wmb(); |
1da177e4 LT |
723 | spin_lock(&fsg->lock); |
724 | bh->inreq_busy = 0; | |
725 | bh->state = BUF_STATE_EMPTY; | |
1da177e4 | 726 | wakeup_thread(fsg); |
a21d4fed | 727 | spin_unlock(&fsg->lock); |
1da177e4 LT |
728 | } |
729 | ||
730 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) | |
731 | { | |
7ca46b86 JD |
732 | struct fsg_dev *fsg = ep->driver_data; |
733 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
734 | |
735 | dump_msg(fsg, "bulk-out", req->buf, req->actual); | |
736 | if (req->status || req->actual != bh->bulk_out_intended_length) | |
441b62c1 | 737 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
738 | req->status, req->actual, |
739 | bh->bulk_out_intended_length); | |
740 | if (req->status == -ECONNRESET) // Request was cancelled | |
741 | usb_ep_fifo_flush(ep); | |
742 | ||
743 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 744 | smp_wmb(); |
1da177e4 LT |
745 | spin_lock(&fsg->lock); |
746 | bh->outreq_busy = 0; | |
747 | bh->state = BUF_STATE_FULL; | |
1da177e4 | 748 | wakeup_thread(fsg); |
a21d4fed | 749 | spin_unlock(&fsg->lock); |
1da177e4 LT |
750 | } |
751 | ||
752 | ||
753 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
754 | static void intr_in_complete(struct usb_ep *ep, struct usb_request *req) | |
755 | { | |
7ca46b86 JD |
756 | struct fsg_dev *fsg = ep->driver_data; |
757 | struct fsg_buffhd *bh = req->context; | |
1da177e4 LT |
758 | |
759 | if (req->status || req->actual != req->length) | |
441b62c1 | 760 | DBG(fsg, "%s --> %d, %u/%u\n", __func__, |
1da177e4 LT |
761 | req->status, req->actual, req->length); |
762 | if (req->status == -ECONNRESET) // Request was cancelled | |
763 | usb_ep_fifo_flush(ep); | |
764 | ||
765 | /* Hold the lock while we update the request and buffer states */ | |
a21d4fed | 766 | smp_wmb(); |
1da177e4 LT |
767 | spin_lock(&fsg->lock); |
768 | fsg->intreq_busy = 0; | |
769 | bh->state = BUF_STATE_EMPTY; | |
1da177e4 | 770 | wakeup_thread(fsg); |
a21d4fed | 771 | spin_unlock(&fsg->lock); |
1da177e4 LT |
772 | } |
773 | ||
774 | #else | |
775 | static void intr_in_complete(struct usb_ep *ep, struct usb_request *req) | |
776 | {} | |
777 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
778 | ||
779 | ||
780 | /*-------------------------------------------------------------------------*/ | |
781 | ||
782 | /* Ep0 class-specific handlers. These always run in_irq. */ | |
783 | ||
784 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
785 | static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
786 | { | |
787 | struct usb_request *req = fsg->ep0req; | |
788 | static u8 cbi_reset_cmnd[6] = { | |
789 | SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff}; | |
790 | ||
791 | /* Error in command transfer? */ | |
792 | if (req->status || req->length != req->actual || | |
793 | req->actual < 6 || req->actual > MAX_COMMAND_SIZE) { | |
794 | ||
795 | /* Not all controllers allow a protocol stall after | |
796 | * receiving control-out data, but we'll try anyway. */ | |
797 | fsg_set_halt(fsg, fsg->ep0); | |
798 | return; // Wait for reset | |
799 | } | |
800 | ||
801 | /* Is it the special reset command? */ | |
802 | if (req->actual >= sizeof cbi_reset_cmnd && | |
803 | memcmp(req->buf, cbi_reset_cmnd, | |
804 | sizeof cbi_reset_cmnd) == 0) { | |
805 | ||
806 | /* Raise an exception to stop the current operation | |
807 | * and reinitialize our state. */ | |
808 | DBG(fsg, "cbi reset request\n"); | |
809 | raise_exception(fsg, FSG_STATE_RESET); | |
810 | return; | |
811 | } | |
812 | ||
813 | VDBG(fsg, "CB[I] accept device-specific command\n"); | |
814 | spin_lock(&fsg->lock); | |
815 | ||
816 | /* Save the command for later */ | |
817 | if (fsg->cbbuf_cmnd_size) | |
b6c63937 | 818 | WARNING(fsg, "CB[I] overwriting previous command\n"); |
1da177e4 LT |
819 | fsg->cbbuf_cmnd_size = req->actual; |
820 | memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size); | |
821 | ||
1da177e4 | 822 | wakeup_thread(fsg); |
a21d4fed | 823 | spin_unlock(&fsg->lock); |
1da177e4 LT |
824 | } |
825 | ||
826 | #else | |
827 | static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
828 | {} | |
829 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ | |
830 | ||
831 | ||
832 | static int class_setup_req(struct fsg_dev *fsg, | |
833 | const struct usb_ctrlrequest *ctrl) | |
834 | { | |
835 | struct usb_request *req = fsg->ep0req; | |
836 | int value = -EOPNOTSUPP; | |
1bbc1696 | 837 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
88e45dbb | 838 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1bbc1696 | 839 | u16 w_length = le16_to_cpu(ctrl->wLength); |
1da177e4 LT |
840 | |
841 | if (!fsg->config) | |
842 | return value; | |
843 | ||
844 | /* Handle Bulk-only class-specific requests */ | |
845 | if (transport_is_bbb()) { | |
846 | switch (ctrl->bRequest) { | |
847 | ||
848 | case USB_BULK_RESET_REQUEST: | |
849 | if (ctrl->bRequestType != (USB_DIR_OUT | | |
850 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
851 | break; | |
88e45dbb | 852 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
853 | value = -EDOM; |
854 | break; | |
855 | } | |
856 | ||
857 | /* Raise an exception to stop the current operation | |
858 | * and reinitialize our state. */ | |
859 | DBG(fsg, "bulk reset request\n"); | |
860 | raise_exception(fsg, FSG_STATE_RESET); | |
861 | value = DELAYED_STATUS; | |
862 | break; | |
863 | ||
864 | case USB_BULK_GET_MAX_LUN_REQUEST: | |
865 | if (ctrl->bRequestType != (USB_DIR_IN | | |
866 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
867 | break; | |
88e45dbb | 868 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
869 | value = -EDOM; |
870 | break; | |
871 | } | |
872 | VDBG(fsg, "get max LUN\n"); | |
873 | *(u8 *) req->buf = fsg->nluns - 1; | |
76f4af8e | 874 | value = 1; |
1da177e4 LT |
875 | break; |
876 | } | |
877 | } | |
878 | ||
879 | /* Handle CBI class-specific requests */ | |
880 | else { | |
881 | switch (ctrl->bRequest) { | |
882 | ||
883 | case USB_CBI_ADSC_REQUEST: | |
884 | if (ctrl->bRequestType != (USB_DIR_OUT | | |
885 | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) | |
886 | break; | |
88e45dbb | 887 | if (w_index != 0 || w_value != 0) { |
1da177e4 LT |
888 | value = -EDOM; |
889 | break; | |
890 | } | |
891 | if (w_length > MAX_COMMAND_SIZE) { | |
892 | value = -EOVERFLOW; | |
893 | break; | |
894 | } | |
895 | value = w_length; | |
896 | fsg->ep0req->context = received_cbi_adsc; | |
897 | break; | |
898 | } | |
899 | } | |
900 | ||
901 | if (value == -EOPNOTSUPP) | |
902 | VDBG(fsg, | |
903 | "unknown class-specific control req " | |
904 | "%02x.%02x v%04x i%04x l%u\n", | |
905 | ctrl->bRequestType, ctrl->bRequest, | |
1bbc1696 | 906 | le16_to_cpu(ctrl->wValue), w_index, w_length); |
1da177e4 LT |
907 | return value; |
908 | } | |
909 | ||
910 | ||
911 | /*-------------------------------------------------------------------------*/ | |
912 | ||
913 | /* Ep0 standard request handlers. These always run in_irq. */ | |
914 | ||
915 | static int standard_setup_req(struct fsg_dev *fsg, | |
916 | const struct usb_ctrlrequest *ctrl) | |
917 | { | |
918 | struct usb_request *req = fsg->ep0req; | |
919 | int value = -EOPNOTSUPP; | |
1bbc1696 DB |
920 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
921 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
1da177e4 LT |
922 | |
923 | /* Usually this just stores reply data in the pre-allocated ep0 buffer, | |
924 | * but config change events will also reconfigure hardware. */ | |
925 | switch (ctrl->bRequest) { | |
926 | ||
927 | case USB_REQ_GET_DESCRIPTOR: | |
928 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
929 | USB_RECIP_DEVICE)) | |
930 | break; | |
931 | switch (w_value >> 8) { | |
932 | ||
933 | case USB_DT_DEVICE: | |
934 | VDBG(fsg, "get device descriptor\n"); | |
76f4af8e | 935 | value = sizeof device_desc; |
1da177e4 LT |
936 | memcpy(req->buf, &device_desc, value); |
937 | break; | |
1da177e4 LT |
938 | case USB_DT_DEVICE_QUALIFIER: |
939 | VDBG(fsg, "get device qualifier\n"); | |
2e806f67 | 940 | if (!gadget_is_dualspeed(fsg->gadget)) |
1da177e4 | 941 | break; |
76f4af8e | 942 | value = sizeof dev_qualifier; |
1da177e4 LT |
943 | memcpy(req->buf, &dev_qualifier, value); |
944 | break; | |
945 | ||
946 | case USB_DT_OTHER_SPEED_CONFIG: | |
947 | VDBG(fsg, "get other-speed config descriptor\n"); | |
2e806f67 | 948 | if (!gadget_is_dualspeed(fsg->gadget)) |
1da177e4 LT |
949 | break; |
950 | goto get_config; | |
1da177e4 LT |
951 | case USB_DT_CONFIG: |
952 | VDBG(fsg, "get configuration descriptor\n"); | |
2e806f67 | 953 | get_config: |
1da177e4 LT |
954 | value = populate_config_buf(fsg->gadget, |
955 | req->buf, | |
956 | w_value >> 8, | |
957 | w_value & 0xff); | |
1da177e4 LT |
958 | break; |
959 | ||
960 | case USB_DT_STRING: | |
961 | VDBG(fsg, "get string descriptor\n"); | |
962 | ||
963 | /* wIndex == language code */ | |
d6181702 | 964 | value = usb_gadget_get_string(&fsg_stringtab, |
1da177e4 | 965 | w_value & 0xff, req->buf); |
1da177e4 LT |
966 | break; |
967 | } | |
968 | break; | |
969 | ||
970 | /* One config, two speeds */ | |
971 | case USB_REQ_SET_CONFIGURATION: | |
972 | if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD | | |
973 | USB_RECIP_DEVICE)) | |
974 | break; | |
975 | VDBG(fsg, "set configuration\n"); | |
976 | if (w_value == CONFIG_VALUE || w_value == 0) { | |
977 | fsg->new_config = w_value; | |
978 | ||
979 | /* Raise an exception to wipe out previous transaction | |
980 | * state (queued bufs, etc) and set the new config. */ | |
981 | raise_exception(fsg, FSG_STATE_CONFIG_CHANGE); | |
982 | value = DELAYED_STATUS; | |
983 | } | |
984 | break; | |
985 | case USB_REQ_GET_CONFIGURATION: | |
986 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
987 | USB_RECIP_DEVICE)) | |
988 | break; | |
989 | VDBG(fsg, "get configuration\n"); | |
990 | *(u8 *) req->buf = fsg->config; | |
76f4af8e | 991 | value = 1; |
1da177e4 LT |
992 | break; |
993 | ||
994 | case USB_REQ_SET_INTERFACE: | |
995 | if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD | | |
996 | USB_RECIP_INTERFACE)) | |
997 | break; | |
998 | if (fsg->config && w_index == 0) { | |
999 | ||
1000 | /* Raise an exception to wipe out previous transaction | |
1001 | * state (queued bufs, etc) and install the new | |
1002 | * interface altsetting. */ | |
1003 | raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE); | |
1004 | value = DELAYED_STATUS; | |
1005 | } | |
1006 | break; | |
1007 | case USB_REQ_GET_INTERFACE: | |
1008 | if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD | | |
1009 | USB_RECIP_INTERFACE)) | |
1010 | break; | |
1011 | if (!fsg->config) | |
1012 | break; | |
1013 | if (w_index != 0) { | |
1014 | value = -EDOM; | |
1015 | break; | |
1016 | } | |
1017 | VDBG(fsg, "get interface\n"); | |
1018 | *(u8 *) req->buf = 0; | |
76f4af8e | 1019 | value = 1; |
1da177e4 LT |
1020 | break; |
1021 | ||
1022 | default: | |
1023 | VDBG(fsg, | |
1024 | "unknown control req %02x.%02x v%04x i%04x l%u\n", | |
1025 | ctrl->bRequestType, ctrl->bRequest, | |
1bbc1696 | 1026 | w_value, w_index, le16_to_cpu(ctrl->wLength)); |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | return value; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | static int fsg_setup(struct usb_gadget *gadget, | |
1034 | const struct usb_ctrlrequest *ctrl) | |
1035 | { | |
1036 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
1037 | int rc; | |
1bbc1696 | 1038 | int w_length = le16_to_cpu(ctrl->wLength); |
1da177e4 LT |
1039 | |
1040 | ++fsg->ep0_req_tag; // Record arrival of a new request | |
1041 | fsg->ep0req->context = NULL; | |
1042 | fsg->ep0req->length = 0; | |
1043 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); | |
1044 | ||
1045 | if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) | |
1046 | rc = class_setup_req(fsg, ctrl); | |
1047 | else | |
1048 | rc = standard_setup_req(fsg, ctrl); | |
1049 | ||
1050 | /* Respond with data/status or defer until later? */ | |
1051 | if (rc >= 0 && rc != DELAYED_STATUS) { | |
76f4af8e | 1052 | rc = min(rc, w_length); |
1da177e4 | 1053 | fsg->ep0req->length = rc; |
1bbc1696 | 1054 | fsg->ep0req->zero = rc < w_length; |
1da177e4 LT |
1055 | fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ? |
1056 | "ep0-in" : "ep0-out"); | |
1057 | rc = ep0_queue(fsg); | |
1058 | } | |
1059 | ||
1060 | /* Device either stalls (rc < 0) or reports success */ | |
1061 | return rc; | |
1062 | } | |
1063 | ||
1064 | ||
1065 | /*-------------------------------------------------------------------------*/ | |
1066 | ||
1067 | /* All the following routines run in process context */ | |
1068 | ||
1069 | ||
1070 | /* Use this for bulk or interrupt transfers, not ep0 */ | |
1071 | static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, | |
a21d4fed AS |
1072 | struct usb_request *req, int *pbusy, |
1073 | enum fsg_buffer_state *state) | |
1da177e4 LT |
1074 | { |
1075 | int rc; | |
1076 | ||
1077 | if (ep == fsg->bulk_in) | |
1078 | dump_msg(fsg, "bulk-in", req->buf, req->length); | |
1079 | else if (ep == fsg->intr_in) | |
1080 | dump_msg(fsg, "intr-in", req->buf, req->length); | |
a21d4fed AS |
1081 | |
1082 | spin_lock_irq(&fsg->lock); | |
1da177e4 LT |
1083 | *pbusy = 1; |
1084 | *state = BUF_STATE_BUSY; | |
a21d4fed | 1085 | spin_unlock_irq(&fsg->lock); |
1da177e4 LT |
1086 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
1087 | if (rc != 0) { | |
1088 | *pbusy = 0; | |
1089 | *state = BUF_STATE_EMPTY; | |
1090 | ||
1091 | /* We can't do much more than wait for a reset */ | |
1092 | ||
1093 | /* Note: currently the net2280 driver fails zero-length | |
1094 | * submissions if DMA is enabled. */ | |
1095 | if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP && | |
1096 | req->length == 0)) | |
b6c63937 | 1097 | WARNING(fsg, "error in submission: %s --> %d\n", |
1da177e4 LT |
1098 | ep->name, rc); |
1099 | } | |
1100 | } | |
1101 | ||
1102 | ||
1103 | static int sleep_thread(struct fsg_dev *fsg) | |
1104 | { | |
a21d4fed | 1105 | int rc = 0; |
1da177e4 LT |
1106 | |
1107 | /* Wait until a signal arrives or we are woken up */ | |
a21d4fed AS |
1108 | for (;;) { |
1109 | try_to_freeze(); | |
1110 | set_current_state(TASK_INTERRUPTIBLE); | |
1111 | if (signal_pending(current)) { | |
1112 | rc = -EINTR; | |
1113 | break; | |
1114 | } | |
1115 | if (fsg->thread_wakeup_needed) | |
1116 | break; | |
1117 | schedule(); | |
1118 | } | |
1119 | __set_current_state(TASK_RUNNING); | |
1da177e4 | 1120 | fsg->thread_wakeup_needed = 0; |
a21d4fed | 1121 | return rc; |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | ||
1125 | /*-------------------------------------------------------------------------*/ | |
1126 | ||
1127 | static int do_read(struct fsg_dev *fsg) | |
1128 | { | |
d6181702 | 1129 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1130 | u32 lba; |
1131 | struct fsg_buffhd *bh; | |
1132 | int rc; | |
1133 | u32 amount_left; | |
1134 | loff_t file_offset, file_offset_tmp; | |
1135 | unsigned int amount; | |
1136 | unsigned int partial_page; | |
1137 | ssize_t nread; | |
1138 | ||
1139 | /* Get the starting Logical Block Address and check that it's | |
1140 | * not too big */ | |
1141 | if (fsg->cmnd[0] == SC_READ_6) | |
604eb89f | 1142 | lba = get_unaligned_be24(&fsg->cmnd[1]); |
1da177e4 | 1143 | else { |
604eb89f | 1144 | lba = get_unaligned_be32(&fsg->cmnd[2]); |
1da177e4 LT |
1145 | |
1146 | /* We allow DPO (Disable Page Out = don't save data in the | |
1147 | * cache) and FUA (Force Unit Access = don't read from the | |
1148 | * cache), but we don't implement them. */ | |
1149 | if ((fsg->cmnd[1] & ~0x18) != 0) { | |
1150 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1151 | return -EINVAL; | |
1152 | } | |
1153 | } | |
1154 | if (lba >= curlun->num_sectors) { | |
1155 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1156 | return -EINVAL; | |
1157 | } | |
1158 | file_offset = ((loff_t) lba) << 9; | |
1159 | ||
1160 | /* Carry out the file reads */ | |
1161 | amount_left = fsg->data_size_from_cmnd; | |
1162 | if (unlikely(amount_left == 0)) | |
1163 | return -EIO; // No default reply | |
1164 | ||
1165 | for (;;) { | |
1166 | ||
1167 | /* Figure out how much we need to read: | |
1168 | * Try to read the remaining amount. | |
1169 | * But don't read more than the buffer size. | |
1170 | * And don't try to read past the end of the file. | |
1171 | * Finally, if we're not at a page boundary, don't read past | |
1172 | * the next page. | |
1173 | * If this means reading 0 then we were asked to read past | |
1174 | * the end of file. */ | |
1175 | amount = min((unsigned int) amount_left, mod_data.buflen); | |
1176 | amount = min((loff_t) amount, | |
1177 | curlun->file_length - file_offset); | |
1178 | partial_page = file_offset & (PAGE_CACHE_SIZE - 1); | |
1179 | if (partial_page > 0) | |
1180 | amount = min(amount, (unsigned int) PAGE_CACHE_SIZE - | |
1181 | partial_page); | |
1182 | ||
1183 | /* Wait for the next buffer to become available */ | |
1184 | bh = fsg->next_buffhd_to_fill; | |
1185 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
1186 | rc = sleep_thread(fsg); |
1187 | if (rc) | |
1da177e4 LT |
1188 | return rc; |
1189 | } | |
1190 | ||
1191 | /* If we were asked to read past the end of file, | |
1192 | * end with an empty buffer. */ | |
1193 | if (amount == 0) { | |
1194 | curlun->sense_data = | |
1195 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1196 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1197 | curlun->info_valid = 1; |
1da177e4 LT |
1198 | bh->inreq->length = 0; |
1199 | bh->state = BUF_STATE_FULL; | |
1200 | break; | |
1201 | } | |
1202 | ||
1203 | /* Perform the read */ | |
1204 | file_offset_tmp = file_offset; | |
1205 | nread = vfs_read(curlun->filp, | |
1206 | (char __user *) bh->buf, | |
1207 | amount, &file_offset_tmp); | |
1208 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1209 | (unsigned long long) file_offset, | |
1210 | (int) nread); | |
1211 | if (signal_pending(current)) | |
1212 | return -EINTR; | |
1213 | ||
1214 | if (nread < 0) { | |
1215 | LDBG(curlun, "error in file read: %d\n", | |
1216 | (int) nread); | |
1217 | nread = 0; | |
1218 | } else if (nread < amount) { | |
1219 | LDBG(curlun, "partial file read: %d/%u\n", | |
1220 | (int) nread, amount); | |
1221 | nread -= (nread & 511); // Round down to a block | |
1222 | } | |
1223 | file_offset += nread; | |
1224 | amount_left -= nread; | |
1225 | fsg->residue -= nread; | |
1226 | bh->inreq->length = nread; | |
1227 | bh->state = BUF_STATE_FULL; | |
1228 | ||
1229 | /* If an error occurred, report it and its position */ | |
1230 | if (nread < amount) { | |
1231 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
1232 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1233 | curlun->info_valid = 1; |
1da177e4 LT |
1234 | break; |
1235 | } | |
1236 | ||
1237 | if (amount_left == 0) | |
1238 | break; // No more left to read | |
1239 | ||
1240 | /* Send this buffer and go read some more */ | |
1241 | bh->inreq->zero = 0; | |
1242 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
1243 | &bh->inreq_busy, &bh->state); | |
1244 | fsg->next_buffhd_to_fill = bh->next; | |
1245 | } | |
1246 | ||
1247 | return -EIO; // No default reply | |
1248 | } | |
1249 | ||
1250 | ||
1251 | /*-------------------------------------------------------------------------*/ | |
1252 | ||
1253 | static int do_write(struct fsg_dev *fsg) | |
1254 | { | |
d6181702 | 1255 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1256 | u32 lba; |
1257 | struct fsg_buffhd *bh; | |
1258 | int get_some_more; | |
1259 | u32 amount_left_to_req, amount_left_to_write; | |
1260 | loff_t usb_offset, file_offset, file_offset_tmp; | |
1261 | unsigned int amount; | |
1262 | unsigned int partial_page; | |
1263 | ssize_t nwritten; | |
1264 | int rc; | |
1265 | ||
1266 | if (curlun->ro) { | |
1267 | curlun->sense_data = SS_WRITE_PROTECTED; | |
1268 | return -EINVAL; | |
1269 | } | |
db1dd4d3 | 1270 | spin_lock(&curlun->filp->f_lock); |
1da177e4 | 1271 | curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait |
db1dd4d3 | 1272 | spin_unlock(&curlun->filp->f_lock); |
1da177e4 LT |
1273 | |
1274 | /* Get the starting Logical Block Address and check that it's | |
1275 | * not too big */ | |
1276 | if (fsg->cmnd[0] == SC_WRITE_6) | |
604eb89f | 1277 | lba = get_unaligned_be24(&fsg->cmnd[1]); |
1da177e4 | 1278 | else { |
604eb89f | 1279 | lba = get_unaligned_be32(&fsg->cmnd[2]); |
1da177e4 LT |
1280 | |
1281 | /* We allow DPO (Disable Page Out = don't save data in the | |
1282 | * cache) and FUA (Force Unit Access = write directly to the | |
1283 | * medium). We don't implement DPO; we implement FUA by | |
1284 | * performing synchronous output. */ | |
1285 | if ((fsg->cmnd[1] & ~0x18) != 0) { | |
1286 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1287 | return -EINVAL; | |
1288 | } | |
a93917d3 AS |
1289 | /* FUA */ |
1290 | if (!curlun->nofua && (fsg->cmnd[1] & 0x08)) { | |
db1dd4d3 | 1291 | spin_lock(&curlun->filp->f_lock); |
6b2f3d1f | 1292 | curlun->filp->f_flags |= O_DSYNC; |
db1dd4d3 JC |
1293 | spin_unlock(&curlun->filp->f_lock); |
1294 | } | |
1da177e4 LT |
1295 | } |
1296 | if (lba >= curlun->num_sectors) { | |
1297 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | ||
1301 | /* Carry out the file writes */ | |
1302 | get_some_more = 1; | |
1303 | file_offset = usb_offset = ((loff_t) lba) << 9; | |
1304 | amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd; | |
1305 | ||
1306 | while (amount_left_to_write > 0) { | |
1307 | ||
1308 | /* Queue a request for more data from the host */ | |
1309 | bh = fsg->next_buffhd_to_fill; | |
1310 | if (bh->state == BUF_STATE_EMPTY && get_some_more) { | |
1311 | ||
1312 | /* Figure out how much we want to get: | |
1313 | * Try to get the remaining amount. | |
1314 | * But don't get more than the buffer size. | |
1315 | * And don't try to go past the end of the file. | |
1316 | * If we're not at a page boundary, | |
1317 | * don't go past the next page. | |
1318 | * If this means getting 0, then we were asked | |
1319 | * to write past the end of file. | |
1320 | * Finally, round down to a block boundary. */ | |
1321 | amount = min(amount_left_to_req, mod_data.buflen); | |
1322 | amount = min((loff_t) amount, curlun->file_length - | |
1323 | usb_offset); | |
1324 | partial_page = usb_offset & (PAGE_CACHE_SIZE - 1); | |
1325 | if (partial_page > 0) | |
1326 | amount = min(amount, | |
1327 | (unsigned int) PAGE_CACHE_SIZE - partial_page); | |
1328 | ||
1329 | if (amount == 0) { | |
1330 | get_some_more = 0; | |
1331 | curlun->sense_data = | |
1332 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1333 | curlun->sense_data_info = usb_offset >> 9; | |
6174d0fd | 1334 | curlun->info_valid = 1; |
1da177e4 LT |
1335 | continue; |
1336 | } | |
1337 | amount -= (amount & 511); | |
1338 | if (amount == 0) { | |
1339 | ||
1340 | /* Why were we were asked to transfer a | |
1341 | * partial block? */ | |
1342 | get_some_more = 0; | |
1343 | continue; | |
1344 | } | |
1345 | ||
1346 | /* Get the next buffer */ | |
1347 | usb_offset += amount; | |
1348 | fsg->usb_amount_left -= amount; | |
1349 | amount_left_to_req -= amount; | |
1350 | if (amount_left_to_req == 0) | |
1351 | get_some_more = 0; | |
1352 | ||
1353 | /* amount is always divisible by 512, hence by | |
1354 | * the bulk-out maxpacket size */ | |
1355 | bh->outreq->length = bh->bulk_out_intended_length = | |
1356 | amount; | |
70ffe6e1 | 1357 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
1358 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
1359 | &bh->outreq_busy, &bh->state); | |
1360 | fsg->next_buffhd_to_fill = bh->next; | |
1361 | continue; | |
1362 | } | |
1363 | ||
1364 | /* Write the received data to the backing file */ | |
1365 | bh = fsg->next_buffhd_to_drain; | |
1366 | if (bh->state == BUF_STATE_EMPTY && !get_some_more) | |
1367 | break; // We stopped early | |
1368 | if (bh->state == BUF_STATE_FULL) { | |
a21d4fed | 1369 | smp_rmb(); |
1da177e4 LT |
1370 | fsg->next_buffhd_to_drain = bh->next; |
1371 | bh->state = BUF_STATE_EMPTY; | |
1372 | ||
1373 | /* Did something go wrong with the transfer? */ | |
1374 | if (bh->outreq->status != 0) { | |
1375 | curlun->sense_data = SS_COMMUNICATION_FAILURE; | |
1376 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1377 | curlun->info_valid = 1; |
1da177e4 LT |
1378 | break; |
1379 | } | |
1380 | ||
1381 | amount = bh->outreq->actual; | |
1382 | if (curlun->file_length - file_offset < amount) { | |
1383 | LERROR(curlun, | |
1384 | "write %u @ %llu beyond end %llu\n", | |
1385 | amount, (unsigned long long) file_offset, | |
1386 | (unsigned long long) curlun->file_length); | |
1387 | amount = curlun->file_length - file_offset; | |
1388 | } | |
1389 | ||
1390 | /* Perform the write */ | |
1391 | file_offset_tmp = file_offset; | |
1392 | nwritten = vfs_write(curlun->filp, | |
1393 | (char __user *) bh->buf, | |
1394 | amount, &file_offset_tmp); | |
1395 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, | |
1396 | (unsigned long long) file_offset, | |
1397 | (int) nwritten); | |
1398 | if (signal_pending(current)) | |
1399 | return -EINTR; // Interrupted! | |
1400 | ||
1401 | if (nwritten < 0) { | |
1402 | LDBG(curlun, "error in file write: %d\n", | |
1403 | (int) nwritten); | |
1404 | nwritten = 0; | |
1405 | } else if (nwritten < amount) { | |
1406 | LDBG(curlun, "partial file write: %d/%u\n", | |
1407 | (int) nwritten, amount); | |
1408 | nwritten -= (nwritten & 511); | |
1409 | // Round down to a block | |
1410 | } | |
1411 | file_offset += nwritten; | |
1412 | amount_left_to_write -= nwritten; | |
1413 | fsg->residue -= nwritten; | |
1414 | ||
1415 | /* If an error occurred, report it and its position */ | |
1416 | if (nwritten < amount) { | |
1417 | curlun->sense_data = SS_WRITE_ERROR; | |
1418 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1419 | curlun->info_valid = 1; |
1da177e4 LT |
1420 | break; |
1421 | } | |
1422 | ||
1423 | /* Did the host decide to stop early? */ | |
1424 | if (bh->outreq->actual != bh->outreq->length) { | |
1425 | fsg->short_packet_received = 1; | |
1426 | break; | |
1427 | } | |
1428 | continue; | |
1429 | } | |
1430 | ||
1431 | /* Wait for something to happen */ | |
79a7d9ee AS |
1432 | rc = sleep_thread(fsg); |
1433 | if (rc) | |
1da177e4 LT |
1434 | return rc; |
1435 | } | |
1436 | ||
1437 | return -EIO; // No default reply | |
1438 | } | |
1439 | ||
1440 | ||
1441 | /*-------------------------------------------------------------------------*/ | |
1442 | ||
1da177e4 LT |
1443 | static int do_synchronize_cache(struct fsg_dev *fsg) |
1444 | { | |
d6181702 | 1445 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1446 | int rc; |
1447 | ||
1448 | /* We ignore the requested LBA and write out all file's | |
1449 | * dirty data buffers. */ | |
d6181702 | 1450 | rc = fsg_lun_fsync_sub(curlun); |
1da177e4 LT |
1451 | if (rc) |
1452 | curlun->sense_data = SS_WRITE_ERROR; | |
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | ||
1457 | /*-------------------------------------------------------------------------*/ | |
1458 | ||
d6181702 | 1459 | static void invalidate_sub(struct fsg_lun *curlun) |
1da177e4 LT |
1460 | { |
1461 | struct file *filp = curlun->filp; | |
33cb8994 | 1462 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
1463 | unsigned long rc; |
1464 | ||
fc0ecff6 | 1465 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); |
2ecdc82e | 1466 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc); |
1da177e4 LT |
1467 | } |
1468 | ||
1469 | static int do_verify(struct fsg_dev *fsg) | |
1470 | { | |
d6181702 | 1471 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1472 | u32 lba; |
1473 | u32 verification_length; | |
1474 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
1475 | loff_t file_offset, file_offset_tmp; | |
1476 | u32 amount_left; | |
1477 | unsigned int amount; | |
1478 | ssize_t nread; | |
1479 | ||
1480 | /* Get the starting Logical Block Address and check that it's | |
1481 | * not too big */ | |
604eb89f | 1482 | lba = get_unaligned_be32(&fsg->cmnd[2]); |
1da177e4 LT |
1483 | if (lba >= curlun->num_sectors) { |
1484 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1485 | return -EINVAL; | |
1486 | } | |
1487 | ||
1488 | /* We allow DPO (Disable Page Out = don't save data in the | |
1489 | * cache) but we don't implement it. */ | |
1490 | if ((fsg->cmnd[1] & ~0x10) != 0) { | |
1491 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1492 | return -EINVAL; | |
1493 | } | |
1494 | ||
604eb89f | 1495 | verification_length = get_unaligned_be16(&fsg->cmnd[7]); |
1da177e4 LT |
1496 | if (unlikely(verification_length == 0)) |
1497 | return -EIO; // No default reply | |
1498 | ||
1499 | /* Prepare to carry out the file verify */ | |
1500 | amount_left = verification_length << 9; | |
1501 | file_offset = ((loff_t) lba) << 9; | |
1502 | ||
1503 | /* Write out all the dirty buffers before invalidating them */ | |
d6181702 | 1504 | fsg_lun_fsync_sub(curlun); |
1da177e4 LT |
1505 | if (signal_pending(current)) |
1506 | return -EINTR; | |
1507 | ||
1508 | invalidate_sub(curlun); | |
1509 | if (signal_pending(current)) | |
1510 | return -EINTR; | |
1511 | ||
1512 | /* Just try to read the requested blocks */ | |
1513 | while (amount_left > 0) { | |
1514 | ||
1515 | /* Figure out how much we need to read: | |
1516 | * Try to read the remaining amount, but not more than | |
1517 | * the buffer size. | |
1518 | * And don't try to read past the end of the file. | |
1519 | * If this means reading 0 then we were asked to read | |
1520 | * past the end of file. */ | |
1521 | amount = min((unsigned int) amount_left, mod_data.buflen); | |
1522 | amount = min((loff_t) amount, | |
1523 | curlun->file_length - file_offset); | |
1524 | if (amount == 0) { | |
1525 | curlun->sense_data = | |
1526 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1527 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1528 | curlun->info_valid = 1; |
1da177e4 LT |
1529 | break; |
1530 | } | |
1531 | ||
1532 | /* Perform the read */ | |
1533 | file_offset_tmp = file_offset; | |
1534 | nread = vfs_read(curlun->filp, | |
1535 | (char __user *) bh->buf, | |
1536 | amount, &file_offset_tmp); | |
1537 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, | |
1538 | (unsigned long long) file_offset, | |
1539 | (int) nread); | |
1540 | if (signal_pending(current)) | |
1541 | return -EINTR; | |
1542 | ||
1543 | if (nread < 0) { | |
1544 | LDBG(curlun, "error in file verify: %d\n", | |
1545 | (int) nread); | |
1546 | nread = 0; | |
1547 | } else if (nread < amount) { | |
1548 | LDBG(curlun, "partial file verify: %d/%u\n", | |
1549 | (int) nread, amount); | |
1550 | nread -= (nread & 511); // Round down to a sector | |
1551 | } | |
1552 | if (nread == 0) { | |
1553 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; | |
1554 | curlun->sense_data_info = file_offset >> 9; | |
6174d0fd | 1555 | curlun->info_valid = 1; |
1da177e4 LT |
1556 | break; |
1557 | } | |
1558 | file_offset += nread; | |
1559 | amount_left -= nread; | |
1560 | } | |
1561 | return 0; | |
1562 | } | |
1563 | ||
1564 | ||
1565 | /*-------------------------------------------------------------------------*/ | |
1566 | ||
1567 | static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1568 | { | |
1569 | u8 *buf = (u8 *) bh->buf; | |
1570 | ||
1571 | static char vendor_id[] = "Linux "; | |
12aae68a AS |
1572 | static char product_disk_id[] = "File-Stor Gadget"; |
1573 | static char product_cdrom_id[] = "File-CD Gadget "; | |
1da177e4 LT |
1574 | |
1575 | if (!fsg->curlun) { // Unsupported LUNs are okay | |
1576 | fsg->bad_lun_okay = 1; | |
1577 | memset(buf, 0, 36); | |
1578 | buf[0] = 0x7f; // Unsupported, no device-type | |
12aae68a | 1579 | buf[4] = 31; // Additional length |
1da177e4 LT |
1580 | return 36; |
1581 | } | |
1582 | ||
12aae68a AS |
1583 | memset(buf, 0, 8); |
1584 | buf[0] = (mod_data.cdrom ? TYPE_CDROM : TYPE_DISK); | |
1da177e4 LT |
1585 | if (mod_data.removable) |
1586 | buf[1] = 0x80; | |
1587 | buf[2] = 2; // ANSI SCSI level 2 | |
1588 | buf[3] = 2; // SCSI-2 INQUIRY data format | |
1589 | buf[4] = 31; // Additional length | |
1590 | // No special options | |
12aae68a AS |
1591 | sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, |
1592 | (mod_data.cdrom ? product_cdrom_id : | |
1593 | product_disk_id), | |
1da177e4 LT |
1594 | mod_data.release); |
1595 | return 36; | |
1596 | } | |
1597 | ||
1598 | ||
1599 | static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1600 | { | |
d6181702 | 1601 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1602 | u8 *buf = (u8 *) bh->buf; |
1603 | u32 sd, sdinfo; | |
6174d0fd | 1604 | int valid; |
1da177e4 LT |
1605 | |
1606 | /* | |
1607 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): | |
1608 | * | |
1609 | * If a REQUEST SENSE command is received from an initiator | |
1610 | * with a pending unit attention condition (before the target | |
1611 | * generates the contingent allegiance condition), then the | |
1612 | * target shall either: | |
1613 | * a) report any pending sense data and preserve the unit | |
1614 | * attention condition on the logical unit, or, | |
1615 | * b) report the unit attention condition, may discard any | |
1616 | * pending sense data, and clear the unit attention | |
1617 | * condition on the logical unit for that initiator. | |
1618 | * | |
1619 | * FSG normally uses option a); enable this code to use option b). | |
1620 | */ | |
1621 | #if 0 | |
1622 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { | |
1623 | curlun->sense_data = curlun->unit_attention_data; | |
1624 | curlun->unit_attention_data = SS_NO_SENSE; | |
1625 | } | |
1626 | #endif | |
1627 | ||
1628 | if (!curlun) { // Unsupported LUNs are okay | |
1629 | fsg->bad_lun_okay = 1; | |
1630 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
1631 | sdinfo = 0; | |
6174d0fd | 1632 | valid = 0; |
1da177e4 LT |
1633 | } else { |
1634 | sd = curlun->sense_data; | |
1635 | sdinfo = curlun->sense_data_info; | |
6174d0fd | 1636 | valid = curlun->info_valid << 7; |
1da177e4 LT |
1637 | curlun->sense_data = SS_NO_SENSE; |
1638 | curlun->sense_data_info = 0; | |
6174d0fd | 1639 | curlun->info_valid = 0; |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | memset(buf, 0, 18); | |
6174d0fd | 1643 | buf[0] = valid | 0x70; // Valid, current error |
1da177e4 | 1644 | buf[2] = SK(sd); |
604eb89f | 1645 | put_unaligned_be32(sdinfo, &buf[3]); /* Sense information */ |
1da177e4 LT |
1646 | buf[7] = 18 - 8; // Additional sense length |
1647 | buf[12] = ASC(sd); | |
1648 | buf[13] = ASCQ(sd); | |
1649 | return 18; | |
1650 | } | |
1651 | ||
1652 | ||
1653 | static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1654 | { | |
d6181702 | 1655 | struct fsg_lun *curlun = fsg->curlun; |
604eb89f | 1656 | u32 lba = get_unaligned_be32(&fsg->cmnd[2]); |
1da177e4 LT |
1657 | int pmi = fsg->cmnd[8]; |
1658 | u8 *buf = (u8 *) bh->buf; | |
1659 | ||
1660 | /* Check the PMI and LBA fields */ | |
1661 | if (pmi > 1 || (pmi == 0 && lba != 0)) { | |
1662 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1663 | return -EINVAL; | |
1664 | } | |
1665 | ||
604eb89f AS |
1666 | put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); |
1667 | /* Max logical block */ | |
1668 | put_unaligned_be32(512, &buf[4]); /* Block length */ | |
1da177e4 LT |
1669 | return 8; |
1670 | } | |
1671 | ||
1672 | ||
12aae68a AS |
1673 | static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
1674 | { | |
d6181702 | 1675 | struct fsg_lun *curlun = fsg->curlun; |
12aae68a | 1676 | int msf = fsg->cmnd[1] & 0x02; |
604eb89f | 1677 | u32 lba = get_unaligned_be32(&fsg->cmnd[2]); |
12aae68a AS |
1678 | u8 *buf = (u8 *) bh->buf; |
1679 | ||
1680 | if ((fsg->cmnd[1] & ~0x02) != 0) { /* Mask away MSF */ | |
1681 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1682 | return -EINVAL; | |
1683 | } | |
1684 | if (lba >= curlun->num_sectors) { | |
1685 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; | |
1686 | return -EINVAL; | |
1687 | } | |
1688 | ||
1689 | memset(buf, 0, 8); | |
1690 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ | |
1691 | store_cdrom_address(&buf[4], msf, lba); | |
1692 | return 8; | |
1693 | } | |
1694 | ||
1695 | ||
1696 | static int do_read_toc(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1697 | { | |
d6181702 | 1698 | struct fsg_lun *curlun = fsg->curlun; |
12aae68a AS |
1699 | int msf = fsg->cmnd[1] & 0x02; |
1700 | int start_track = fsg->cmnd[6]; | |
1701 | u8 *buf = (u8 *) bh->buf; | |
1702 | ||
1703 | if ((fsg->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ | |
1704 | start_track > 1) { | |
1705 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1706 | return -EINVAL; | |
1707 | } | |
1708 | ||
1709 | memset(buf, 0, 20); | |
1710 | buf[1] = (20-2); /* TOC data length */ | |
1711 | buf[2] = 1; /* First track number */ | |
1712 | buf[3] = 1; /* Last track number */ | |
1713 | buf[5] = 0x16; /* Data track, copying allowed */ | |
1714 | buf[6] = 0x01; /* Only track is number 1 */ | |
1715 | store_cdrom_address(&buf[8], msf, 0); | |
1716 | ||
1717 | buf[13] = 0x16; /* Lead-out track is data */ | |
1718 | buf[14] = 0xAA; /* Lead-out track number */ | |
1719 | store_cdrom_address(&buf[16], msf, curlun->num_sectors); | |
1720 | return 20; | |
1721 | } | |
1722 | ||
1723 | ||
1da177e4 LT |
1724 | static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
1725 | { | |
d6181702 | 1726 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1727 | int mscmnd = fsg->cmnd[0]; |
1728 | u8 *buf = (u8 *) bh->buf; | |
1729 | u8 *buf0 = buf; | |
1730 | int pc, page_code; | |
1731 | int changeable_values, all_pages; | |
1732 | int valid_page = 0; | |
1733 | int len, limit; | |
1734 | ||
1735 | if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD | |
1736 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1737 | return -EINVAL; | |
1738 | } | |
1739 | pc = fsg->cmnd[2] >> 6; | |
1740 | page_code = fsg->cmnd[2] & 0x3f; | |
1741 | if (pc == 3) { | |
1742 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; | |
1743 | return -EINVAL; | |
1744 | } | |
1745 | changeable_values = (pc == 1); | |
1746 | all_pages = (page_code == 0x3f); | |
1747 | ||
1748 | /* Write the mode parameter header. Fixed values are: default | |
1749 | * medium type, no cache control (DPOFUA), and no block descriptors. | |
1750 | * The only variable value is the WriteProtect bit. We will fill in | |
1751 | * the mode data length later. */ | |
1752 | memset(buf, 0, 8); | |
1753 | if (mscmnd == SC_MODE_SENSE_6) { | |
1754 | buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA | |
1755 | buf += 4; | |
1756 | limit = 255; | |
1757 | } else { // SC_MODE_SENSE_10 | |
1758 | buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA | |
1759 | buf += 8; | |
1760 | limit = 65535; // Should really be mod_data.buflen | |
1761 | } | |
1762 | ||
1763 | /* No block descriptors */ | |
1764 | ||
1765 | /* The mode pages, in numerical order. The only page we support | |
1766 | * is the Caching page. */ | |
1767 | if (page_code == 0x08 || all_pages) { | |
1768 | valid_page = 1; | |
1769 | buf[0] = 0x08; // Page code | |
1770 | buf[1] = 10; // Page length | |
1771 | memset(buf+2, 0, 10); // None of the fields are changeable | |
1772 | ||
1773 | if (!changeable_values) { | |
1774 | buf[2] = 0x04; // Write cache enable, | |
1775 | // Read cache not disabled | |
1776 | // No cache retention priorities | |
604eb89f AS |
1777 | put_unaligned_be16(0xffff, &buf[4]); |
1778 | /* Don't disable prefetch */ | |
1779 | /* Minimum prefetch = 0 */ | |
1780 | put_unaligned_be16(0xffff, &buf[8]); | |
1781 | /* Maximum prefetch */ | |
1782 | put_unaligned_be16(0xffff, &buf[10]); | |
1783 | /* Maximum prefetch ceiling */ | |
1da177e4 LT |
1784 | } |
1785 | buf += 12; | |
1786 | } | |
1787 | ||
1788 | /* Check that a valid page was requested and the mode data length | |
1789 | * isn't too long. */ | |
1790 | len = buf - buf0; | |
1791 | if (!valid_page || len > limit) { | |
1792 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1793 | return -EINVAL; | |
1794 | } | |
1795 | ||
1796 | /* Store the mode data length */ | |
1797 | if (mscmnd == SC_MODE_SENSE_6) | |
1798 | buf0[0] = len - 1; | |
1799 | else | |
604eb89f | 1800 | put_unaligned_be16(len - 2, buf0); |
1da177e4 LT |
1801 | return len; |
1802 | } | |
1803 | ||
1804 | ||
1805 | static int do_start_stop(struct fsg_dev *fsg) | |
1806 | { | |
d6181702 | 1807 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1808 | int loej, start; |
1809 | ||
1810 | if (!mod_data.removable) { | |
1811 | curlun->sense_data = SS_INVALID_COMMAND; | |
1812 | return -EINVAL; | |
1813 | } | |
1814 | ||
1815 | // int immed = fsg->cmnd[1] & 0x01; | |
1816 | loej = fsg->cmnd[4] & 0x02; | |
1817 | start = fsg->cmnd[4] & 0x01; | |
1818 | ||
1819 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
1820 | if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed | |
1821 | (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start | |
1822 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1823 | return -EINVAL; | |
1824 | } | |
1825 | ||
1826 | if (!start) { | |
1827 | ||
1828 | /* Are we allowed to unload the media? */ | |
1829 | if (curlun->prevent_medium_removal) { | |
1830 | LDBG(curlun, "unload attempt prevented\n"); | |
1831 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; | |
1832 | return -EINVAL; | |
1833 | } | |
1834 | if (loej) { // Simulate an unload/eject | |
1835 | up_read(&fsg->filesem); | |
1836 | down_write(&fsg->filesem); | |
d6181702 | 1837 | fsg_lun_close(curlun); |
1da177e4 LT |
1838 | up_write(&fsg->filesem); |
1839 | down_read(&fsg->filesem); | |
1840 | } | |
1841 | } else { | |
1842 | ||
1843 | /* Our emulation doesn't support mounting; the medium is | |
1844 | * available for use as soon as it is loaded. */ | |
d6181702 | 1845 | if (!fsg_lun_is_open(curlun)) { |
1da177e4 LT |
1846 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; |
1847 | return -EINVAL; | |
1848 | } | |
1849 | } | |
1850 | #endif | |
1851 | return 0; | |
1852 | } | |
1853 | ||
1854 | ||
1855 | static int do_prevent_allow(struct fsg_dev *fsg) | |
1856 | { | |
d6181702 | 1857 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1858 | int prevent; |
1859 | ||
1860 | if (!mod_data.removable) { | |
1861 | curlun->sense_data = SS_INVALID_COMMAND; | |
1862 | return -EINVAL; | |
1863 | } | |
1864 | ||
1865 | prevent = fsg->cmnd[4] & 0x01; | |
1866 | if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent | |
1867 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | if (curlun->prevent_medium_removal && !prevent) | |
d6181702 | 1872 | fsg_lun_fsync_sub(curlun); |
1da177e4 LT |
1873 | curlun->prevent_medium_removal = prevent; |
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | ||
1878 | static int do_read_format_capacities(struct fsg_dev *fsg, | |
1879 | struct fsg_buffhd *bh) | |
1880 | { | |
d6181702 | 1881 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1882 | u8 *buf = (u8 *) bh->buf; |
1883 | ||
1884 | buf[0] = buf[1] = buf[2] = 0; | |
1885 | buf[3] = 8; // Only the Current/Maximum Capacity Descriptor | |
1886 | buf += 4; | |
1887 | ||
604eb89f AS |
1888 | put_unaligned_be32(curlun->num_sectors, &buf[0]); |
1889 | /* Number of blocks */ | |
1890 | put_unaligned_be32(512, &buf[4]); /* Block length */ | |
1891 | buf[4] = 0x02; /* Current capacity */ | |
1da177e4 LT |
1892 | return 12; |
1893 | } | |
1894 | ||
1895 | ||
1896 | static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
1897 | { | |
d6181702 | 1898 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
1899 | |
1900 | /* We don't support MODE SELECT */ | |
1901 | curlun->sense_data = SS_INVALID_COMMAND; | |
1902 | return -EINVAL; | |
1903 | } | |
1904 | ||
1905 | ||
1906 | /*-------------------------------------------------------------------------*/ | |
1907 | ||
1908 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) | |
1909 | { | |
1910 | int rc; | |
1911 | ||
1912 | rc = fsg_set_halt(fsg, fsg->bulk_in); | |
1913 | if (rc == -EAGAIN) | |
1914 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); | |
1915 | while (rc != 0) { | |
1916 | if (rc != -EAGAIN) { | |
b6c63937 | 1917 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); |
1da177e4 LT |
1918 | rc = 0; |
1919 | break; | |
1920 | } | |
1921 | ||
1922 | /* Wait for a short time and then try again */ | |
1923 | if (msleep_interruptible(100) != 0) | |
1924 | return -EINTR; | |
1925 | rc = usb_ep_set_halt(fsg->bulk_in); | |
1926 | } | |
1927 | return rc; | |
1928 | } | |
1929 | ||
62fd2cac DL |
1930 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) |
1931 | { | |
1932 | int rc; | |
1933 | ||
1934 | DBG(fsg, "bulk-in set wedge\n"); | |
1935 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1936 | if (rc == -EAGAIN) | |
1937 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); | |
1938 | while (rc != 0) { | |
1939 | if (rc != -EAGAIN) { | |
b6c63937 | 1940 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); |
62fd2cac DL |
1941 | rc = 0; |
1942 | break; | |
1943 | } | |
1944 | ||
1945 | /* Wait for a short time and then try again */ | |
1946 | if (msleep_interruptible(100) != 0) | |
1947 | return -EINTR; | |
1948 | rc = usb_ep_set_wedge(fsg->bulk_in); | |
1949 | } | |
1950 | return rc; | |
1951 | } | |
1952 | ||
1da177e4 LT |
1953 | static int pad_with_zeros(struct fsg_dev *fsg) |
1954 | { | |
1955 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
1956 | u32 nkeep = bh->inreq->length; | |
1957 | u32 nsend; | |
1958 | int rc; | |
1959 | ||
1960 | bh->state = BUF_STATE_EMPTY; // For the first iteration | |
1961 | fsg->usb_amount_left = nkeep + fsg->residue; | |
1962 | while (fsg->usb_amount_left > 0) { | |
1963 | ||
1964 | /* Wait for the next buffer to be free */ | |
1965 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
1966 | rc = sleep_thread(fsg); |
1967 | if (rc) | |
1da177e4 LT |
1968 | return rc; |
1969 | } | |
1970 | ||
1971 | nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen); | |
1972 | memset(bh->buf + nkeep, 0, nsend - nkeep); | |
1973 | bh->inreq->length = nsend; | |
1974 | bh->inreq->zero = 0; | |
1975 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
1976 | &bh->inreq_busy, &bh->state); | |
1977 | bh = fsg->next_buffhd_to_fill = bh->next; | |
1978 | fsg->usb_amount_left -= nsend; | |
1979 | nkeep = 0; | |
1980 | } | |
1981 | return 0; | |
1982 | } | |
1983 | ||
1984 | static int throw_away_data(struct fsg_dev *fsg) | |
1985 | { | |
1986 | struct fsg_buffhd *bh; | |
1987 | u32 amount; | |
1988 | int rc; | |
1989 | ||
1990 | while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY || | |
1991 | fsg->usb_amount_left > 0) { | |
1992 | ||
1993 | /* Throw away the data in a filled buffer */ | |
1994 | if (bh->state == BUF_STATE_FULL) { | |
a21d4fed | 1995 | smp_rmb(); |
1da177e4 LT |
1996 | bh->state = BUF_STATE_EMPTY; |
1997 | fsg->next_buffhd_to_drain = bh->next; | |
1998 | ||
1999 | /* A short packet or an error ends everything */ | |
2000 | if (bh->outreq->actual != bh->outreq->length || | |
2001 | bh->outreq->status != 0) { | |
2002 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2003 | return -EINTR; | |
2004 | } | |
2005 | continue; | |
2006 | } | |
2007 | ||
2008 | /* Try to submit another request if we need one */ | |
2009 | bh = fsg->next_buffhd_to_fill; | |
2010 | if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) { | |
2011 | amount = min(fsg->usb_amount_left, | |
2012 | (u32) mod_data.buflen); | |
2013 | ||
2014 | /* amount is always divisible by 512, hence by | |
2015 | * the bulk-out maxpacket size */ | |
2016 | bh->outreq->length = bh->bulk_out_intended_length = | |
2017 | amount; | |
70ffe6e1 | 2018 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
2019 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
2020 | &bh->outreq_busy, &bh->state); | |
2021 | fsg->next_buffhd_to_fill = bh->next; | |
2022 | fsg->usb_amount_left -= amount; | |
2023 | continue; | |
2024 | } | |
2025 | ||
2026 | /* Otherwise wait for something to happen */ | |
79a7d9ee AS |
2027 | rc = sleep_thread(fsg); |
2028 | if (rc) | |
1da177e4 LT |
2029 | return rc; |
2030 | } | |
2031 | return 0; | |
2032 | } | |
2033 | ||
2034 | ||
2035 | static int finish_reply(struct fsg_dev *fsg) | |
2036 | { | |
2037 | struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; | |
2038 | int rc = 0; | |
2039 | ||
2040 | switch (fsg->data_dir) { | |
2041 | case DATA_DIR_NONE: | |
2042 | break; // Nothing to send | |
2043 | ||
2044 | /* If we don't know whether the host wants to read or write, | |
2045 | * this must be CB or CBI with an unknown command. We mustn't | |
2046 | * try to send or receive any data. So stall both bulk pipes | |
2047 | * if we can and wait for a reset. */ | |
2048 | case DATA_DIR_UNKNOWN: | |
2049 | if (mod_data.can_stall) { | |
2050 | fsg_set_halt(fsg, fsg->bulk_out); | |
2051 | rc = halt_bulk_in_endpoint(fsg); | |
2052 | } | |
2053 | break; | |
2054 | ||
2055 | /* All but the last buffer of data must have already been sent */ | |
2056 | case DATA_DIR_TO_HOST: | |
2057 | if (fsg->data_size == 0) | |
2058 | ; // Nothing to send | |
2059 | ||
2060 | /* If there's no residue, simply send the last buffer */ | |
2061 | else if (fsg->residue == 0) { | |
2062 | bh->inreq->zero = 0; | |
2063 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2064 | &bh->inreq_busy, &bh->state); | |
2065 | fsg->next_buffhd_to_fill = bh->next; | |
2066 | } | |
2067 | ||
2068 | /* There is a residue. For CB and CBI, simply mark the end | |
2069 | * of the data with a short packet. However, if we are | |
2070 | * allowed to stall, there was no data at all (residue == | |
2071 | * data_size), and the command failed (invalid LUN or | |
2072 | * sense data is set), then halt the bulk-in endpoint | |
2073 | * instead. */ | |
2074 | else if (!transport_is_bbb()) { | |
2075 | if (mod_data.can_stall && | |
2076 | fsg->residue == fsg->data_size && | |
2077 | (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) { | |
2078 | bh->state = BUF_STATE_EMPTY; | |
2079 | rc = halt_bulk_in_endpoint(fsg); | |
2080 | } else { | |
2081 | bh->inreq->zero = 1; | |
2082 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2083 | &bh->inreq_busy, &bh->state); | |
2084 | fsg->next_buffhd_to_fill = bh->next; | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | /* For Bulk-only, if we're allowed to stall then send the | |
2089 | * short packet and halt the bulk-in endpoint. If we can't | |
2090 | * stall, pad out the remaining data with 0's. */ | |
2091 | else { | |
2092 | if (mod_data.can_stall) { | |
2093 | bh->inreq->zero = 1; | |
2094 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2095 | &bh->inreq_busy, &bh->state); | |
2096 | fsg->next_buffhd_to_fill = bh->next; | |
2097 | rc = halt_bulk_in_endpoint(fsg); | |
2098 | } else | |
2099 | rc = pad_with_zeros(fsg); | |
2100 | } | |
2101 | break; | |
2102 | ||
2103 | /* We have processed all we want from the data the host has sent. | |
2104 | * There may still be outstanding bulk-out requests. */ | |
2105 | case DATA_DIR_FROM_HOST: | |
2106 | if (fsg->residue == 0) | |
2107 | ; // Nothing to receive | |
2108 | ||
2109 | /* Did the host stop sending unexpectedly early? */ | |
2110 | else if (fsg->short_packet_received) { | |
2111 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2112 | rc = -EINTR; | |
2113 | } | |
2114 | ||
2115 | /* We haven't processed all the incoming data. Even though | |
2116 | * we may be allowed to stall, doing so would cause a race. | |
2117 | * The controller may already have ACK'ed all the remaining | |
2118 | * bulk-out packets, in which case the host wouldn't see a | |
2119 | * STALL. Not realizing the endpoint was halted, it wouldn't | |
2120 | * clear the halt -- leading to problems later on. */ | |
2121 | #if 0 | |
2122 | else if (mod_data.can_stall) { | |
2123 | fsg_set_halt(fsg, fsg->bulk_out); | |
2124 | raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); | |
2125 | rc = -EINTR; | |
2126 | } | |
2127 | #endif | |
2128 | ||
2129 | /* We can't stall. Read in the excess data and throw it | |
2130 | * all away. */ | |
2131 | else | |
2132 | rc = throw_away_data(fsg); | |
2133 | break; | |
2134 | } | |
2135 | return rc; | |
2136 | } | |
2137 | ||
2138 | ||
2139 | static int send_status(struct fsg_dev *fsg) | |
2140 | { | |
d6181702 | 2141 | struct fsg_lun *curlun = fsg->curlun; |
1da177e4 LT |
2142 | struct fsg_buffhd *bh; |
2143 | int rc; | |
2144 | u8 status = USB_STATUS_PASS; | |
2145 | u32 sd, sdinfo = 0; | |
2146 | ||
2147 | /* Wait for the next buffer to become available */ | |
2148 | bh = fsg->next_buffhd_to_fill; | |
2149 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2150 | rc = sleep_thread(fsg); |
2151 | if (rc) | |
1da177e4 LT |
2152 | return rc; |
2153 | } | |
2154 | ||
2155 | if (curlun) { | |
2156 | sd = curlun->sense_data; | |
2157 | sdinfo = curlun->sense_data_info; | |
2158 | } else if (fsg->bad_lun_okay) | |
2159 | sd = SS_NO_SENSE; | |
2160 | else | |
2161 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; | |
2162 | ||
2163 | if (fsg->phase_error) { | |
2164 | DBG(fsg, "sending phase-error status\n"); | |
2165 | status = USB_STATUS_PHASE_ERROR; | |
2166 | sd = SS_INVALID_COMMAND; | |
2167 | } else if (sd != SS_NO_SENSE) { | |
2168 | DBG(fsg, "sending command-failure status\n"); | |
2169 | status = USB_STATUS_FAIL; | |
2170 | VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" | |
2171 | " info x%x\n", | |
2172 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); | |
2173 | } | |
2174 | ||
2175 | if (transport_is_bbb()) { | |
7ca46b86 | 2176 | struct bulk_cs_wrap *csw = bh->buf; |
1da177e4 LT |
2177 | |
2178 | /* Store and send the Bulk-only CSW */ | |
551509d2 | 2179 | csw->Signature = cpu_to_le32(USB_BULK_CS_SIG); |
1da177e4 LT |
2180 | csw->Tag = fsg->tag; |
2181 | csw->Residue = cpu_to_le32(fsg->residue); | |
2182 | csw->Status = status; | |
2183 | ||
2184 | bh->inreq->length = USB_BULK_CS_WRAP_LEN; | |
2185 | bh->inreq->zero = 0; | |
2186 | start_transfer(fsg, fsg->bulk_in, bh->inreq, | |
2187 | &bh->inreq_busy, &bh->state); | |
2188 | ||
2189 | } else if (mod_data.transport_type == USB_PR_CB) { | |
2190 | ||
2191 | /* Control-Bulk transport has no status phase! */ | |
2192 | return 0; | |
2193 | ||
2194 | } else { // USB_PR_CBI | |
7ca46b86 | 2195 | struct interrupt_data *buf = bh->buf; |
1da177e4 LT |
2196 | |
2197 | /* Store and send the Interrupt data. UFI sends the ASC | |
2198 | * and ASCQ bytes. Everything else sends a Type (which | |
2199 | * is always 0) and the status Value. */ | |
2200 | if (mod_data.protocol_type == USB_SC_UFI) { | |
2201 | buf->bType = ASC(sd); | |
2202 | buf->bValue = ASCQ(sd); | |
2203 | } else { | |
2204 | buf->bType = 0; | |
2205 | buf->bValue = status; | |
2206 | } | |
2207 | fsg->intreq->length = CBI_INTERRUPT_DATA_LEN; | |
2208 | ||
2209 | fsg->intr_buffhd = bh; // Point to the right buffhd | |
2210 | fsg->intreq->buf = bh->inreq->buf; | |
1da177e4 LT |
2211 | fsg->intreq->context = bh; |
2212 | start_transfer(fsg, fsg->intr_in, fsg->intreq, | |
2213 | &fsg->intreq_busy, &bh->state); | |
2214 | } | |
2215 | ||
2216 | fsg->next_buffhd_to_fill = bh->next; | |
2217 | return 0; | |
2218 | } | |
2219 | ||
2220 | ||
2221 | /*-------------------------------------------------------------------------*/ | |
2222 | ||
2223 | /* Check whether the command is properly formed and whether its data size | |
2224 | * and direction agree with the values we already have. */ | |
2225 | static int check_command(struct fsg_dev *fsg, int cmnd_size, | |
2226 | enum data_direction data_dir, unsigned int mask, | |
2227 | int needs_medium, const char *name) | |
2228 | { | |
2229 | int i; | |
2230 | int lun = fsg->cmnd[1] >> 5; | |
2231 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; | |
2232 | char hdlen[20]; | |
d6181702 | 2233 | struct fsg_lun *curlun; |
1da177e4 LT |
2234 | |
2235 | /* Adjust the expected cmnd_size for protocol encapsulation padding. | |
2236 | * Transparent SCSI doesn't pad. */ | |
2237 | if (protocol_is_scsi()) | |
2238 | ; | |
2239 | ||
2240 | /* There's some disagreement as to whether RBC pads commands or not. | |
2241 | * We'll play it safe and accept either form. */ | |
2242 | else if (mod_data.protocol_type == USB_SC_RBC) { | |
2243 | if (fsg->cmnd_size == 12) | |
2244 | cmnd_size = 12; | |
2245 | ||
2246 | /* All the other protocols pad to 12 bytes */ | |
2247 | } else | |
2248 | cmnd_size = 12; | |
2249 | ||
2250 | hdlen[0] = 0; | |
2251 | if (fsg->data_dir != DATA_DIR_UNKNOWN) | |
2252 | sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir], | |
2253 | fsg->data_size); | |
2254 | VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", | |
2255 | name, cmnd_size, dirletter[(int) data_dir], | |
2256 | fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen); | |
2257 | ||
2258 | /* We can't reply at all until we know the correct data direction | |
2259 | * and size. */ | |
2260 | if (fsg->data_size_from_cmnd == 0) | |
2261 | data_dir = DATA_DIR_NONE; | |
2262 | if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI | |
2263 | fsg->data_dir = data_dir; | |
2264 | fsg->data_size = fsg->data_size_from_cmnd; | |
2265 | ||
2266 | } else { // Bulk-only | |
2267 | if (fsg->data_size < fsg->data_size_from_cmnd) { | |
2268 | ||
2269 | /* Host data size < Device data size is a phase error. | |
2270 | * Carry out the command, but only transfer as much | |
2271 | * as we are allowed. */ | |
2272 | fsg->data_size_from_cmnd = fsg->data_size; | |
2273 | fsg->phase_error = 1; | |
2274 | } | |
2275 | } | |
2276 | fsg->residue = fsg->usb_amount_left = fsg->data_size; | |
2277 | ||
2278 | /* Conflicting data directions is a phase error */ | |
2279 | if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) { | |
2280 | fsg->phase_error = 1; | |
2281 | return -EINVAL; | |
2282 | } | |
2283 | ||
2284 | /* Verify the length of the command itself */ | |
2285 | if (cmnd_size != fsg->cmnd_size) { | |
2286 | ||
549c41e0 FB |
2287 | /* Special case workaround: There are plenty of buggy SCSI |
2288 | * implementations. Many have issues with cbw->Length | |
2289 | * field passing a wrong command size. For those cases we | |
2290 | * always try to work around the problem by using the length | |
2291 | * sent by the host side provided it is at least as large | |
2292 | * as the correct command length. | |
2293 | * Examples of such cases would be MS-Windows, which issues | |
2294 | * REQUEST SENSE with cbw->Length == 12 where it should | |
2295 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and | |
2296 | * REQUEST SENSE with cbw->Length == 10 where it should | |
2297 | * be 6 as well. | |
2298 | */ | |
2299 | if (cmnd_size <= fsg->cmnd_size) { | |
2300 | DBG(fsg, "%s is buggy! Expected length %d " | |
2301 | "but we got %d\n", name, | |
2302 | cmnd_size, fsg->cmnd_size); | |
1da177e4 | 2303 | cmnd_size = fsg->cmnd_size; |
549c41e0 | 2304 | } else { |
1da177e4 LT |
2305 | fsg->phase_error = 1; |
2306 | return -EINVAL; | |
2307 | } | |
2308 | } | |
2309 | ||
d794ac7a | 2310 | /* Check that the LUN values are consistent */ |
1da177e4 LT |
2311 | if (transport_is_bbb()) { |
2312 | if (fsg->lun != lun) | |
2313 | DBG(fsg, "using LUN %d from CBW, " | |
2314 | "not LUN %d from CDB\n", | |
2315 | fsg->lun, lun); | |
2316 | } else | |
2317 | fsg->lun = lun; // Use LUN from the command | |
2318 | ||
2319 | /* Check the LUN */ | |
2320 | if (fsg->lun >= 0 && fsg->lun < fsg->nluns) { | |
2321 | fsg->curlun = curlun = &fsg->luns[fsg->lun]; | |
2322 | if (fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2323 | curlun->sense_data = SS_NO_SENSE; | |
2324 | curlun->sense_data_info = 0; | |
6174d0fd | 2325 | curlun->info_valid = 0; |
1da177e4 LT |
2326 | } |
2327 | } else { | |
2328 | fsg->curlun = curlun = NULL; | |
2329 | fsg->bad_lun_okay = 0; | |
2330 | ||
2331 | /* INQUIRY and REQUEST SENSE commands are explicitly allowed | |
2332 | * to use unsupported LUNs; all others may not. */ | |
2333 | if (fsg->cmnd[0] != SC_INQUIRY && | |
2334 | fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2335 | DBG(fsg, "unsupported LUN %d\n", fsg->lun); | |
2336 | return -EINVAL; | |
2337 | } | |
2338 | } | |
2339 | ||
2340 | /* If a unit attention condition exists, only INQUIRY and | |
2341 | * REQUEST SENSE commands are allowed; anything else must fail. */ | |
2342 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE && | |
2343 | fsg->cmnd[0] != SC_INQUIRY && | |
2344 | fsg->cmnd[0] != SC_REQUEST_SENSE) { | |
2345 | curlun->sense_data = curlun->unit_attention_data; | |
2346 | curlun->unit_attention_data = SS_NO_SENSE; | |
2347 | return -EINVAL; | |
2348 | } | |
2349 | ||
2350 | /* Check that only command bytes listed in the mask are non-zero */ | |
2351 | fsg->cmnd[1] &= 0x1f; // Mask away the LUN | |
2352 | for (i = 1; i < cmnd_size; ++i) { | |
2353 | if (fsg->cmnd[i] && !(mask & (1 << i))) { | |
2354 | if (curlun) | |
2355 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; | |
2356 | return -EINVAL; | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | /* If the medium isn't mounted and the command needs to access | |
2361 | * it, return an error. */ | |
d6181702 | 2362 | if (curlun && !fsg_lun_is_open(curlun) && needs_medium) { |
1da177e4 LT |
2363 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; |
2364 | return -EINVAL; | |
2365 | } | |
2366 | ||
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | ||
2371 | static int do_scsi_command(struct fsg_dev *fsg) | |
2372 | { | |
2373 | struct fsg_buffhd *bh; | |
2374 | int rc; | |
2375 | int reply = -EINVAL; | |
2376 | int i; | |
2377 | static char unknown[16]; | |
2378 | ||
2379 | dump_cdb(fsg); | |
2380 | ||
2381 | /* Wait for the next buffer to become available for data or status */ | |
2382 | bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill; | |
2383 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2384 | rc = sleep_thread(fsg); |
2385 | if (rc) | |
1da177e4 | 2386 | return rc; |
79a7d9ee | 2387 | } |
1da177e4 LT |
2388 | fsg->phase_error = 0; |
2389 | fsg->short_packet_received = 0; | |
2390 | ||
2391 | down_read(&fsg->filesem); // We're using the backing file | |
2392 | switch (fsg->cmnd[0]) { | |
2393 | ||
2394 | case SC_INQUIRY: | |
2395 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2396 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2397 | (1<<4), 0, | |
2398 | "INQUIRY")) == 0) | |
2399 | reply = do_inquiry(fsg, bh); | |
2400 | break; | |
2401 | ||
2402 | case SC_MODE_SELECT_6: | |
2403 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2404 | if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, | |
2405 | (1<<1) | (1<<4), 0, | |
2406 | "MODE SELECT(6)")) == 0) | |
2407 | reply = do_mode_select(fsg, bh); | |
2408 | break; | |
2409 | ||
2410 | case SC_MODE_SELECT_10: | |
604eb89f | 2411 | fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]); |
1da177e4 LT |
2412 | if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, |
2413 | (1<<1) | (3<<7), 0, | |
2414 | "MODE SELECT(10)")) == 0) | |
2415 | reply = do_mode_select(fsg, bh); | |
2416 | break; | |
2417 | ||
2418 | case SC_MODE_SENSE_6: | |
2419 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2420 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2421 | (1<<1) | (1<<2) | (1<<4), 0, | |
2422 | "MODE SENSE(6)")) == 0) | |
2423 | reply = do_mode_sense(fsg, bh); | |
2424 | break; | |
2425 | ||
2426 | case SC_MODE_SENSE_10: | |
604eb89f | 2427 | fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]); |
1da177e4 LT |
2428 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
2429 | (1<<1) | (1<<2) | (3<<7), 0, | |
2430 | "MODE SENSE(10)")) == 0) | |
2431 | reply = do_mode_sense(fsg, bh); | |
2432 | break; | |
2433 | ||
2434 | case SC_PREVENT_ALLOW_MEDIUM_REMOVAL: | |
2435 | fsg->data_size_from_cmnd = 0; | |
2436 | if ((reply = check_command(fsg, 6, DATA_DIR_NONE, | |
2437 | (1<<4), 0, | |
2438 | "PREVENT-ALLOW MEDIUM REMOVAL")) == 0) | |
2439 | reply = do_prevent_allow(fsg); | |
2440 | break; | |
2441 | ||
2442 | case SC_READ_6: | |
2443 | i = fsg->cmnd[4]; | |
2444 | fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; | |
2445 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2446 | (7<<1) | (1<<4), 1, | |
2447 | "READ(6)")) == 0) | |
2448 | reply = do_read(fsg); | |
2449 | break; | |
2450 | ||
2451 | case SC_READ_10: | |
604eb89f AS |
2452 | fsg->data_size_from_cmnd = |
2453 | get_unaligned_be16(&fsg->cmnd[7]) << 9; | |
1da177e4 LT |
2454 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
2455 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
2456 | "READ(10)")) == 0) | |
2457 | reply = do_read(fsg); | |
2458 | break; | |
2459 | ||
2460 | case SC_READ_12: | |
604eb89f AS |
2461 | fsg->data_size_from_cmnd = |
2462 | get_unaligned_be32(&fsg->cmnd[6]) << 9; | |
1da177e4 LT |
2463 | if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST, |
2464 | (1<<1) | (0xf<<2) | (0xf<<6), 1, | |
2465 | "READ(12)")) == 0) | |
2466 | reply = do_read(fsg); | |
2467 | break; | |
2468 | ||
2469 | case SC_READ_CAPACITY: | |
2470 | fsg->data_size_from_cmnd = 8; | |
2471 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, | |
2472 | (0xf<<2) | (1<<8), 1, | |
2473 | "READ CAPACITY")) == 0) | |
2474 | reply = do_read_capacity(fsg, bh); | |
2475 | break; | |
2476 | ||
12aae68a AS |
2477 | case SC_READ_HEADER: |
2478 | if (!mod_data.cdrom) | |
2479 | goto unknown_cmnd; | |
604eb89f | 2480 | fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]); |
12aae68a AS |
2481 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
2482 | (3<<7) | (0x1f<<1), 1, | |
2483 | "READ HEADER")) == 0) | |
2484 | reply = do_read_header(fsg, bh); | |
2485 | break; | |
2486 | ||
2487 | case SC_READ_TOC: | |
2488 | if (!mod_data.cdrom) | |
2489 | goto unknown_cmnd; | |
604eb89f | 2490 | fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]); |
12aae68a AS |
2491 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
2492 | (7<<6) | (1<<1), 1, | |
2493 | "READ TOC")) == 0) | |
2494 | reply = do_read_toc(fsg, bh); | |
2495 | break; | |
2496 | ||
1da177e4 | 2497 | case SC_READ_FORMAT_CAPACITIES: |
604eb89f | 2498 | fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]); |
1da177e4 LT |
2499 | if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, |
2500 | (3<<7), 1, | |
2501 | "READ FORMAT CAPACITIES")) == 0) | |
2502 | reply = do_read_format_capacities(fsg, bh); | |
2503 | break; | |
2504 | ||
2505 | case SC_REQUEST_SENSE: | |
2506 | fsg->data_size_from_cmnd = fsg->cmnd[4]; | |
2507 | if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, | |
2508 | (1<<4), 0, | |
2509 | "REQUEST SENSE")) == 0) | |
2510 | reply = do_request_sense(fsg, bh); | |
2511 | break; | |
2512 | ||
2513 | case SC_START_STOP_UNIT: | |
2514 | fsg->data_size_from_cmnd = 0; | |
2515 | if ((reply = check_command(fsg, 6, DATA_DIR_NONE, | |
2516 | (1<<1) | (1<<4), 0, | |
2517 | "START-STOP UNIT")) == 0) | |
2518 | reply = do_start_stop(fsg); | |
2519 | break; | |
2520 | ||
2521 | case SC_SYNCHRONIZE_CACHE: | |
2522 | fsg->data_size_from_cmnd = 0; | |
2523 | if ((reply = check_command(fsg, 10, DATA_DIR_NONE, | |
2524 | (0xf<<2) | (3<<7), 1, | |
2525 | "SYNCHRONIZE CACHE")) == 0) | |
2526 | reply = do_synchronize_cache(fsg); | |
2527 | break; | |
2528 | ||
2529 | case SC_TEST_UNIT_READY: | |
2530 | fsg->data_size_from_cmnd = 0; | |
2531 | reply = check_command(fsg, 6, DATA_DIR_NONE, | |
2532 | 0, 1, | |
2533 | "TEST UNIT READY"); | |
2534 | break; | |
2535 | ||
2536 | /* Although optional, this command is used by MS-Windows. We | |
2537 | * support a minimal version: BytChk must be 0. */ | |
2538 | case SC_VERIFY: | |
2539 | fsg->data_size_from_cmnd = 0; | |
2540 | if ((reply = check_command(fsg, 10, DATA_DIR_NONE, | |
2541 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
2542 | "VERIFY")) == 0) | |
2543 | reply = do_verify(fsg); | |
2544 | break; | |
2545 | ||
2546 | case SC_WRITE_6: | |
2547 | i = fsg->cmnd[4]; | |
2548 | fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; | |
2549 | if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, | |
2550 | (7<<1) | (1<<4), 1, | |
2551 | "WRITE(6)")) == 0) | |
2552 | reply = do_write(fsg); | |
2553 | break; | |
2554 | ||
2555 | case SC_WRITE_10: | |
604eb89f AS |
2556 | fsg->data_size_from_cmnd = |
2557 | get_unaligned_be16(&fsg->cmnd[7]) << 9; | |
1da177e4 LT |
2558 | if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, |
2559 | (1<<1) | (0xf<<2) | (3<<7), 1, | |
2560 | "WRITE(10)")) == 0) | |
2561 | reply = do_write(fsg); | |
2562 | break; | |
2563 | ||
2564 | case SC_WRITE_12: | |
604eb89f AS |
2565 | fsg->data_size_from_cmnd = |
2566 | get_unaligned_be32(&fsg->cmnd[6]) << 9; | |
1da177e4 LT |
2567 | if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST, |
2568 | (1<<1) | (0xf<<2) | (0xf<<6), 1, | |
2569 | "WRITE(12)")) == 0) | |
2570 | reply = do_write(fsg); | |
2571 | break; | |
2572 | ||
2573 | /* Some mandatory commands that we recognize but don't implement. | |
2574 | * They don't mean much in this setting. It's left as an exercise | |
2575 | * for anyone interested to implement RESERVE and RELEASE in terms | |
2576 | * of Posix locks. */ | |
2577 | case SC_FORMAT_UNIT: | |
2578 | case SC_RELEASE: | |
2579 | case SC_RESERVE: | |
2580 | case SC_SEND_DIAGNOSTIC: | |
2581 | // Fall through | |
2582 | ||
2583 | default: | |
12aae68a | 2584 | unknown_cmnd: |
1da177e4 LT |
2585 | fsg->data_size_from_cmnd = 0; |
2586 | sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]); | |
2587 | if ((reply = check_command(fsg, fsg->cmnd_size, | |
2588 | DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) { | |
2589 | fsg->curlun->sense_data = SS_INVALID_COMMAND; | |
2590 | reply = -EINVAL; | |
2591 | } | |
2592 | break; | |
2593 | } | |
2594 | up_read(&fsg->filesem); | |
2595 | ||
2596 | if (reply == -EINTR || signal_pending(current)) | |
2597 | return -EINTR; | |
2598 | ||
2599 | /* Set up the single reply buffer for finish_reply() */ | |
2600 | if (reply == -EINVAL) | |
2601 | reply = 0; // Error reply length | |
2602 | if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) { | |
2603 | reply = min((u32) reply, fsg->data_size_from_cmnd); | |
2604 | bh->inreq->length = reply; | |
2605 | bh->state = BUF_STATE_FULL; | |
2606 | fsg->residue -= reply; | |
2607 | } // Otherwise it's already set | |
2608 | ||
2609 | return 0; | |
2610 | } | |
2611 | ||
2612 | ||
2613 | /*-------------------------------------------------------------------------*/ | |
2614 | ||
2615 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) | |
2616 | { | |
d6181702 MN |
2617 | struct usb_request *req = bh->outreq; |
2618 | struct fsg_bulk_cb_wrap *cbw = req->buf; | |
1da177e4 | 2619 | |
b950bdbc AS |
2620 | /* Was this a real packet? Should it be ignored? */ |
2621 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) | |
1da177e4 LT |
2622 | return -EINVAL; |
2623 | ||
2624 | /* Is the CBW valid? */ | |
2625 | if (req->actual != USB_BULK_CB_WRAP_LEN || | |
551509d2 | 2626 | cbw->Signature != cpu_to_le32( |
1da177e4 LT |
2627 | USB_BULK_CB_SIG)) { |
2628 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", | |
2629 | req->actual, | |
2630 | le32_to_cpu(cbw->Signature)); | |
2631 | ||
b950bdbc AS |
2632 | /* The Bulk-only spec says we MUST stall the IN endpoint |
2633 | * (6.6.1), so it's unavoidable. It also says we must | |
2634 | * retain this state until the next reset, but there's | |
2635 | * no way to tell the controller driver it should ignore | |
2636 | * Clear-Feature(HALT) requests. | |
2637 | * | |
2638 | * We aren't required to halt the OUT endpoint; instead | |
2639 | * we can simply accept and discard any data received | |
2640 | * until the next reset. */ | |
62fd2cac | 2641 | wedge_bulk_in_endpoint(fsg); |
b950bdbc | 2642 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
1da177e4 LT |
2643 | return -EINVAL; |
2644 | } | |
2645 | ||
2646 | /* Is the CBW meaningful? */ | |
d6181702 | 2647 | if (cbw->Lun >= FSG_MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG || |
12943f09 | 2648 | cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { |
1da177e4 LT |
2649 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " |
2650 | "cmdlen %u\n", | |
2651 | cbw->Lun, cbw->Flags, cbw->Length); | |
2652 | ||
2653 | /* We can do anything we want here, so let's stall the | |
2654 | * bulk pipes if we are allowed to. */ | |
2655 | if (mod_data.can_stall) { | |
2656 | fsg_set_halt(fsg, fsg->bulk_out); | |
2657 | halt_bulk_in_endpoint(fsg); | |
2658 | } | |
2659 | return -EINVAL; | |
2660 | } | |
2661 | ||
2662 | /* Save the command for later */ | |
2663 | fsg->cmnd_size = cbw->Length; | |
2664 | memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size); | |
2665 | if (cbw->Flags & USB_BULK_IN_FLAG) | |
2666 | fsg->data_dir = DATA_DIR_TO_HOST; | |
2667 | else | |
2668 | fsg->data_dir = DATA_DIR_FROM_HOST; | |
2669 | fsg->data_size = le32_to_cpu(cbw->DataTransferLength); | |
2670 | if (fsg->data_size == 0) | |
2671 | fsg->data_dir = DATA_DIR_NONE; | |
2672 | fsg->lun = cbw->Lun; | |
2673 | fsg->tag = cbw->Tag; | |
2674 | return 0; | |
2675 | } | |
2676 | ||
2677 | ||
2678 | static int get_next_command(struct fsg_dev *fsg) | |
2679 | { | |
2680 | struct fsg_buffhd *bh; | |
2681 | int rc = 0; | |
2682 | ||
2683 | if (transport_is_bbb()) { | |
2684 | ||
2685 | /* Wait for the next buffer to become available */ | |
2686 | bh = fsg->next_buffhd_to_fill; | |
2687 | while (bh->state != BUF_STATE_EMPTY) { | |
79a7d9ee AS |
2688 | rc = sleep_thread(fsg); |
2689 | if (rc) | |
1da177e4 | 2690 | return rc; |
79a7d9ee | 2691 | } |
1da177e4 LT |
2692 | |
2693 | /* Queue a request to read a Bulk-only CBW */ | |
2694 | set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); | |
70ffe6e1 | 2695 | bh->outreq->short_not_ok = 1; |
1da177e4 LT |
2696 | start_transfer(fsg, fsg->bulk_out, bh->outreq, |
2697 | &bh->outreq_busy, &bh->state); | |
2698 | ||
2699 | /* We will drain the buffer in software, which means we | |
2700 | * can reuse it for the next filling. No need to advance | |
2701 | * next_buffhd_to_fill. */ | |
2702 | ||
2703 | /* Wait for the CBW to arrive */ | |
2704 | while (bh->state != BUF_STATE_FULL) { | |
79a7d9ee AS |
2705 | rc = sleep_thread(fsg); |
2706 | if (rc) | |
1da177e4 | 2707 | return rc; |
79a7d9ee | 2708 | } |
a21d4fed | 2709 | smp_rmb(); |
1da177e4 LT |
2710 | rc = received_cbw(fsg, bh); |
2711 | bh->state = BUF_STATE_EMPTY; | |
2712 | ||
2713 | } else { // USB_PR_CB or USB_PR_CBI | |
2714 | ||
2715 | /* Wait for the next command to arrive */ | |
2716 | while (fsg->cbbuf_cmnd_size == 0) { | |
79a7d9ee AS |
2717 | rc = sleep_thread(fsg); |
2718 | if (rc) | |
1da177e4 | 2719 | return rc; |
79a7d9ee | 2720 | } |
1da177e4 LT |
2721 | |
2722 | /* Is the previous status interrupt request still busy? | |
2723 | * The host is allowed to skip reading the status, | |
2724 | * so we must cancel it. */ | |
2725 | if (fsg->intreq_busy) | |
2726 | usb_ep_dequeue(fsg->intr_in, fsg->intreq); | |
2727 | ||
2728 | /* Copy the command and mark the buffer empty */ | |
2729 | fsg->data_dir = DATA_DIR_UNKNOWN; | |
2730 | spin_lock_irq(&fsg->lock); | |
2731 | fsg->cmnd_size = fsg->cbbuf_cmnd_size; | |
2732 | memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size); | |
2733 | fsg->cbbuf_cmnd_size = 0; | |
2734 | spin_unlock_irq(&fsg->lock); | |
2735 | } | |
2736 | return rc; | |
2737 | } | |
2738 | ||
2739 | ||
2740 | /*-------------------------------------------------------------------------*/ | |
2741 | ||
2742 | static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep, | |
2743 | const struct usb_endpoint_descriptor *d) | |
2744 | { | |
2745 | int rc; | |
2746 | ||
2747 | ep->driver_data = fsg; | |
2748 | rc = usb_ep_enable(ep, d); | |
2749 | if (rc) | |
2750 | ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc); | |
2751 | return rc; | |
2752 | } | |
2753 | ||
2754 | static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep, | |
2755 | struct usb_request **preq) | |
2756 | { | |
2757 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
2758 | if (*preq) | |
2759 | return 0; | |
2760 | ERROR(fsg, "can't allocate request for %s\n", ep->name); | |
2761 | return -ENOMEM; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * Reset interface setting and re-init endpoint state (toggle etc). | |
2766 | * Call with altsetting < 0 to disable the interface. The only other | |
2767 | * available altsetting is 0, which enables the interface. | |
2768 | */ | |
2769 | static int do_set_interface(struct fsg_dev *fsg, int altsetting) | |
2770 | { | |
2771 | int rc = 0; | |
2772 | int i; | |
2773 | const struct usb_endpoint_descriptor *d; | |
2774 | ||
2775 | if (fsg->running) | |
2776 | DBG(fsg, "reset interface\n"); | |
2777 | ||
2778 | reset: | |
2779 | /* Deallocate the requests */ | |
d6181702 | 2780 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
2781 | struct fsg_buffhd *bh = &fsg->buffhds[i]; |
2782 | ||
2783 | if (bh->inreq) { | |
2784 | usb_ep_free_request(fsg->bulk_in, bh->inreq); | |
2785 | bh->inreq = NULL; | |
2786 | } | |
2787 | if (bh->outreq) { | |
2788 | usb_ep_free_request(fsg->bulk_out, bh->outreq); | |
2789 | bh->outreq = NULL; | |
2790 | } | |
2791 | } | |
2792 | if (fsg->intreq) { | |
2793 | usb_ep_free_request(fsg->intr_in, fsg->intreq); | |
2794 | fsg->intreq = NULL; | |
2795 | } | |
2796 | ||
2797 | /* Disable the endpoints */ | |
2798 | if (fsg->bulk_in_enabled) { | |
2799 | usb_ep_disable(fsg->bulk_in); | |
2800 | fsg->bulk_in_enabled = 0; | |
2801 | } | |
2802 | if (fsg->bulk_out_enabled) { | |
2803 | usb_ep_disable(fsg->bulk_out); | |
2804 | fsg->bulk_out_enabled = 0; | |
2805 | } | |
2806 | if (fsg->intr_in_enabled) { | |
2807 | usb_ep_disable(fsg->intr_in); | |
2808 | fsg->intr_in_enabled = 0; | |
2809 | } | |
2810 | ||
2811 | fsg->running = 0; | |
2812 | if (altsetting < 0 || rc != 0) | |
2813 | return rc; | |
2814 | ||
2815 | DBG(fsg, "set interface %d\n", altsetting); | |
2816 | ||
2817 | /* Enable the endpoints */ | |
d6181702 MN |
2818 | d = fsg_ep_desc(fsg->gadget, |
2819 | &fsg_fs_bulk_in_desc, &fsg_hs_bulk_in_desc); | |
1da177e4 LT |
2820 | if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0) |
2821 | goto reset; | |
2822 | fsg->bulk_in_enabled = 1; | |
2823 | ||
d6181702 MN |
2824 | d = fsg_ep_desc(fsg->gadget, |
2825 | &fsg_fs_bulk_out_desc, &fsg_hs_bulk_out_desc); | |
1da177e4 LT |
2826 | if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0) |
2827 | goto reset; | |
2828 | fsg->bulk_out_enabled = 1; | |
2829 | fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize); | |
b950bdbc | 2830 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
1da177e4 LT |
2831 | |
2832 | if (transport_is_cbi()) { | |
d6181702 MN |
2833 | d = fsg_ep_desc(fsg->gadget, |
2834 | &fsg_fs_intr_in_desc, &fsg_hs_intr_in_desc); | |
1da177e4 LT |
2835 | if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0) |
2836 | goto reset; | |
2837 | fsg->intr_in_enabled = 1; | |
2838 | } | |
2839 | ||
2840 | /* Allocate the requests */ | |
d6181702 | 2841 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
2842 | struct fsg_buffhd *bh = &fsg->buffhds[i]; |
2843 | ||
2844 | if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0) | |
2845 | goto reset; | |
2846 | if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0) | |
2847 | goto reset; | |
2848 | bh->inreq->buf = bh->outreq->buf = bh->buf; | |
1da177e4 LT |
2849 | bh->inreq->context = bh->outreq->context = bh; |
2850 | bh->inreq->complete = bulk_in_complete; | |
2851 | bh->outreq->complete = bulk_out_complete; | |
2852 | } | |
2853 | if (transport_is_cbi()) { | |
2854 | if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0) | |
2855 | goto reset; | |
2856 | fsg->intreq->complete = intr_in_complete; | |
2857 | } | |
2858 | ||
2859 | fsg->running = 1; | |
2860 | for (i = 0; i < fsg->nluns; ++i) | |
2861 | fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED; | |
2862 | return rc; | |
2863 | } | |
2864 | ||
2865 | ||
2866 | /* | |
2867 | * Change our operational configuration. This code must agree with the code | |
2868 | * that returns config descriptors, and with interface altsetting code. | |
2869 | * | |
2870 | * It's also responsible for power management interactions. Some | |
2871 | * configurations might not work with our current power sources. | |
2872 | * For now we just assume the gadget is always self-powered. | |
2873 | */ | |
2874 | static int do_set_config(struct fsg_dev *fsg, u8 new_config) | |
2875 | { | |
2876 | int rc = 0; | |
2877 | ||
2878 | /* Disable the single interface */ | |
2879 | if (fsg->config != 0) { | |
2880 | DBG(fsg, "reset config\n"); | |
2881 | fsg->config = 0; | |
2882 | rc = do_set_interface(fsg, -1); | |
2883 | } | |
2884 | ||
2885 | /* Enable the interface */ | |
2886 | if (new_config != 0) { | |
2887 | fsg->config = new_config; | |
2888 | if ((rc = do_set_interface(fsg, 0)) != 0) | |
2889 | fsg->config = 0; // Reset on errors | |
2890 | else { | |
2891 | char *speed; | |
2892 | ||
2893 | switch (fsg->gadget->speed) { | |
2894 | case USB_SPEED_LOW: speed = "low"; break; | |
2895 | case USB_SPEED_FULL: speed = "full"; break; | |
2896 | case USB_SPEED_HIGH: speed = "high"; break; | |
2897 | default: speed = "?"; break; | |
2898 | } | |
2899 | INFO(fsg, "%s speed config #%d\n", speed, fsg->config); | |
2900 | } | |
2901 | } | |
2902 | return rc; | |
2903 | } | |
2904 | ||
2905 | ||
2906 | /*-------------------------------------------------------------------------*/ | |
2907 | ||
2908 | static void handle_exception(struct fsg_dev *fsg) | |
2909 | { | |
2910 | siginfo_t info; | |
2911 | int sig; | |
2912 | int i; | |
2913 | int num_active; | |
2914 | struct fsg_buffhd *bh; | |
2915 | enum fsg_state old_state; | |
2916 | u8 new_config; | |
d6181702 | 2917 | struct fsg_lun *curlun; |
1da177e4 LT |
2918 | unsigned int exception_req_tag; |
2919 | int rc; | |
2920 | ||
2921 | /* Clear the existing signals. Anything but SIGUSR1 is converted | |
2922 | * into a high-priority EXIT exception. */ | |
2923 | for (;;) { | |
8cfbe7e6 | 2924 | sig = dequeue_signal_lock(current, ¤t->blocked, &info); |
1da177e4 LT |
2925 | if (!sig) |
2926 | break; | |
2927 | if (sig != SIGUSR1) { | |
2928 | if (fsg->state < FSG_STATE_EXIT) | |
2929 | DBG(fsg, "Main thread exiting on signal\n"); | |
2930 | raise_exception(fsg, FSG_STATE_EXIT); | |
2931 | } | |
2932 | } | |
2933 | ||
2934 | /* Cancel all the pending transfers */ | |
2935 | if (fsg->intreq_busy) | |
2936 | usb_ep_dequeue(fsg->intr_in, fsg->intreq); | |
d6181702 | 2937 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
2938 | bh = &fsg->buffhds[i]; |
2939 | if (bh->inreq_busy) | |
2940 | usb_ep_dequeue(fsg->bulk_in, bh->inreq); | |
2941 | if (bh->outreq_busy) | |
2942 | usb_ep_dequeue(fsg->bulk_out, bh->outreq); | |
2943 | } | |
2944 | ||
2945 | /* Wait until everything is idle */ | |
2946 | for (;;) { | |
2947 | num_active = fsg->intreq_busy; | |
d6181702 | 2948 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
2949 | bh = &fsg->buffhds[i]; |
2950 | num_active += bh->inreq_busy + bh->outreq_busy; | |
2951 | } | |
2952 | if (num_active == 0) | |
2953 | break; | |
2954 | if (sleep_thread(fsg)) | |
2955 | return; | |
2956 | } | |
2957 | ||
2958 | /* Clear out the controller's fifos */ | |
2959 | if (fsg->bulk_in_enabled) | |
2960 | usb_ep_fifo_flush(fsg->bulk_in); | |
2961 | if (fsg->bulk_out_enabled) | |
2962 | usb_ep_fifo_flush(fsg->bulk_out); | |
2963 | if (fsg->intr_in_enabled) | |
2964 | usb_ep_fifo_flush(fsg->intr_in); | |
2965 | ||
2966 | /* Reset the I/O buffer states and pointers, the SCSI | |
2967 | * state, and the exception. Then invoke the handler. */ | |
2968 | spin_lock_irq(&fsg->lock); | |
2969 | ||
d6181702 | 2970 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
2971 | bh = &fsg->buffhds[i]; |
2972 | bh->state = BUF_STATE_EMPTY; | |
2973 | } | |
2974 | fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain = | |
2975 | &fsg->buffhds[0]; | |
2976 | ||
2977 | exception_req_tag = fsg->exception_req_tag; | |
2978 | new_config = fsg->new_config; | |
2979 | old_state = fsg->state; | |
2980 | ||
2981 | if (old_state == FSG_STATE_ABORT_BULK_OUT) | |
2982 | fsg->state = FSG_STATE_STATUS_PHASE; | |
2983 | else { | |
2984 | for (i = 0; i < fsg->nluns; ++i) { | |
2985 | curlun = &fsg->luns[i]; | |
2986 | curlun->prevent_medium_removal = 0; | |
2987 | curlun->sense_data = curlun->unit_attention_data = | |
2988 | SS_NO_SENSE; | |
2989 | curlun->sense_data_info = 0; | |
6174d0fd | 2990 | curlun->info_valid = 0; |
1da177e4 LT |
2991 | } |
2992 | fsg->state = FSG_STATE_IDLE; | |
2993 | } | |
2994 | spin_unlock_irq(&fsg->lock); | |
2995 | ||
2996 | /* Carry out any extra actions required for the exception */ | |
2997 | switch (old_state) { | |
2998 | default: | |
2999 | break; | |
3000 | ||
3001 | case FSG_STATE_ABORT_BULK_OUT: | |
3002 | send_status(fsg); | |
3003 | spin_lock_irq(&fsg->lock); | |
3004 | if (fsg->state == FSG_STATE_STATUS_PHASE) | |
3005 | fsg->state = FSG_STATE_IDLE; | |
3006 | spin_unlock_irq(&fsg->lock); | |
3007 | break; | |
3008 | ||
3009 | case FSG_STATE_RESET: | |
3010 | /* In case we were forced against our will to halt a | |
3011 | * bulk endpoint, clear the halt now. (The SuperH UDC | |
3012 | * requires this.) */ | |
b950bdbc | 3013 | if (test_and_clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) |
1da177e4 | 3014 | usb_ep_clear_halt(fsg->bulk_in); |
1da177e4 LT |
3015 | |
3016 | if (transport_is_bbb()) { | |
3017 | if (fsg->ep0_req_tag == exception_req_tag) | |
3018 | ep0_queue(fsg); // Complete the status stage | |
3019 | ||
3020 | } else if (transport_is_cbi()) | |
3021 | send_status(fsg); // Status by interrupt pipe | |
3022 | ||
3023 | /* Technically this should go here, but it would only be | |
3024 | * a waste of time. Ditto for the INTERFACE_CHANGE and | |
3025 | * CONFIG_CHANGE cases. */ | |
3026 | // for (i = 0; i < fsg->nluns; ++i) | |
3027 | // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED; | |
3028 | break; | |
3029 | ||
3030 | case FSG_STATE_INTERFACE_CHANGE: | |
3031 | rc = do_set_interface(fsg, 0); | |
3032 | if (fsg->ep0_req_tag != exception_req_tag) | |
3033 | break; | |
3034 | if (rc != 0) // STALL on errors | |
3035 | fsg_set_halt(fsg, fsg->ep0); | |
3036 | else // Complete the status stage | |
3037 | ep0_queue(fsg); | |
3038 | break; | |
3039 | ||
3040 | case FSG_STATE_CONFIG_CHANGE: | |
3041 | rc = do_set_config(fsg, new_config); | |
3042 | if (fsg->ep0_req_tag != exception_req_tag) | |
3043 | break; | |
3044 | if (rc != 0) // STALL on errors | |
3045 | fsg_set_halt(fsg, fsg->ep0); | |
3046 | else // Complete the status stage | |
3047 | ep0_queue(fsg); | |
3048 | break; | |
3049 | ||
3050 | case FSG_STATE_DISCONNECT: | |
b6058d0f | 3051 | for (i = 0; i < fsg->nluns; ++i) |
d6181702 | 3052 | fsg_lun_fsync_sub(fsg->luns + i); |
1da177e4 LT |
3053 | do_set_config(fsg, 0); // Unconfigured state |
3054 | break; | |
3055 | ||
3056 | case FSG_STATE_EXIT: | |
3057 | case FSG_STATE_TERMINATED: | |
3058 | do_set_config(fsg, 0); // Free resources | |
3059 | spin_lock_irq(&fsg->lock); | |
3060 | fsg->state = FSG_STATE_TERMINATED; // Stop the thread | |
3061 | spin_unlock_irq(&fsg->lock); | |
3062 | break; | |
3063 | } | |
3064 | } | |
3065 | ||
3066 | ||
3067 | /*-------------------------------------------------------------------------*/ | |
3068 | ||
3069 | static int fsg_main_thread(void *fsg_) | |
3070 | { | |
7ca46b86 | 3071 | struct fsg_dev *fsg = fsg_; |
1da177e4 | 3072 | |
1da177e4 LT |
3073 | /* Allow the thread to be killed by a signal, but set the signal mask |
3074 | * to block everything but INT, TERM, KILL, and USR1. */ | |
8cfbe7e6 ON |
3075 | allow_signal(SIGINT); |
3076 | allow_signal(SIGTERM); | |
3077 | allow_signal(SIGKILL); | |
3078 | allow_signal(SIGUSR1); | |
1da177e4 | 3079 | |
83144186 RW |
3080 | /* Allow the thread to be frozen */ |
3081 | set_freezable(); | |
3082 | ||
1da177e4 LT |
3083 | /* Arrange for userspace references to be interpreted as kernel |
3084 | * pointers. That way we can pass a kernel pointer to a routine | |
3085 | * that expects a __user pointer and it will work okay. */ | |
3086 | set_fs(get_ds()); | |
3087 | ||
1da177e4 LT |
3088 | /* The main loop */ |
3089 | while (fsg->state != FSG_STATE_TERMINATED) { | |
3090 | if (exception_in_progress(fsg) || signal_pending(current)) { | |
3091 | handle_exception(fsg); | |
3092 | continue; | |
3093 | } | |
3094 | ||
3095 | if (!fsg->running) { | |
3096 | sleep_thread(fsg); | |
3097 | continue; | |
3098 | } | |
3099 | ||
3100 | if (get_next_command(fsg)) | |
3101 | continue; | |
3102 | ||
3103 | spin_lock_irq(&fsg->lock); | |
3104 | if (!exception_in_progress(fsg)) | |
3105 | fsg->state = FSG_STATE_DATA_PHASE; | |
3106 | spin_unlock_irq(&fsg->lock); | |
3107 | ||
3108 | if (do_scsi_command(fsg) || finish_reply(fsg)) | |
3109 | continue; | |
3110 | ||
3111 | spin_lock_irq(&fsg->lock); | |
3112 | if (!exception_in_progress(fsg)) | |
3113 | fsg->state = FSG_STATE_STATUS_PHASE; | |
3114 | spin_unlock_irq(&fsg->lock); | |
3115 | ||
3116 | if (send_status(fsg)) | |
3117 | continue; | |
3118 | ||
3119 | spin_lock_irq(&fsg->lock); | |
3120 | if (!exception_in_progress(fsg)) | |
3121 | fsg->state = FSG_STATE_IDLE; | |
3122 | spin_unlock_irq(&fsg->lock); | |
3123 | } | |
3124 | ||
22efcf4a | 3125 | spin_lock_irq(&fsg->lock); |
1da177e4 | 3126 | fsg->thread_task = NULL; |
22efcf4a | 3127 | spin_unlock_irq(&fsg->lock); |
1da177e4 | 3128 | |
82a10a81 AS |
3129 | /* If we are exiting because of a signal, unregister the |
3130 | * gadget driver. */ | |
3131 | if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) | |
1da177e4 | 3132 | usb_gadget_unregister_driver(&fsg_driver); |
1da177e4 LT |
3133 | |
3134 | /* Let the unbind and cleanup routines know the thread has exited */ | |
3135 | complete_and_exit(&fsg->thread_notifier, 0); | |
3136 | } | |
3137 | ||
3138 | ||
3139 | /*-------------------------------------------------------------------------*/ | |
3140 | ||
1da177e4 LT |
3141 | |
3142 | /* The write permissions and store_xxx pointers are set in fsg_bind() */ | |
93f93740 | 3143 | static DEVICE_ATTR(ro, 0444, fsg_show_ro, NULL); |
a93917d3 | 3144 | static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, NULL); |
93f93740 | 3145 | static DEVICE_ATTR(file, 0444, fsg_show_file, NULL); |
1da177e4 LT |
3146 | |
3147 | ||
3148 | /*-------------------------------------------------------------------------*/ | |
3149 | ||
87c4252a AS |
3150 | static void fsg_release(struct kref *ref) |
3151 | { | |
3152 | struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref); | |
3153 | ||
3154 | kfree(fsg->luns); | |
3155 | kfree(fsg); | |
3156 | } | |
3157 | ||
1da177e4 LT |
3158 | static void lun_release(struct device *dev) |
3159 | { | |
93f93740 MN |
3160 | struct rw_semaphore *filesem = dev_get_drvdata(dev); |
3161 | struct fsg_dev *fsg = | |
3162 | container_of(filesem, struct fsg_dev, filesem); | |
1da177e4 | 3163 | |
87c4252a | 3164 | kref_put(&fsg->ref, fsg_release); |
1da177e4 LT |
3165 | } |
3166 | ||
a353678d | 3167 | static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget) |
1da177e4 LT |
3168 | { |
3169 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
3170 | int i; | |
d6181702 | 3171 | struct fsg_lun *curlun; |
1da177e4 LT |
3172 | struct usb_request *req = fsg->ep0req; |
3173 | ||
3174 | DBG(fsg, "unbind\n"); | |
3175 | clear_bit(REGISTERED, &fsg->atomic_bitflags); | |
3176 | ||
3177 | /* Unregister the sysfs attribute files and the LUNs */ | |
1da177e4 LT |
3178 | for (i = 0; i < fsg->nluns; ++i) { |
3179 | curlun = &fsg->luns[i]; | |
3180 | if (curlun->registered) { | |
3181 | device_remove_file(&curlun->dev, &dev_attr_ro); | |
3182 | device_remove_file(&curlun->dev, &dev_attr_file); | |
d6181702 | 3183 | fsg_lun_close(curlun); |
1da177e4 | 3184 | device_unregister(&curlun->dev); |
1da177e4 LT |
3185 | curlun->registered = 0; |
3186 | } | |
3187 | } | |
3188 | ||
3189 | /* If the thread isn't already dead, tell it to exit now */ | |
3190 | if (fsg->state != FSG_STATE_TERMINATED) { | |
3191 | raise_exception(fsg, FSG_STATE_EXIT); | |
3192 | wait_for_completion(&fsg->thread_notifier); | |
3193 | ||
3194 | /* The cleanup routine waits for this completion also */ | |
3195 | complete(&fsg->thread_notifier); | |
3196 | } | |
3197 | ||
3198 | /* Free the data buffers */ | |
d6181702 | 3199 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) |
9d8bab58 | 3200 | kfree(fsg->buffhds[i].buf); |
1da177e4 LT |
3201 | |
3202 | /* Free the request and buffer for endpoint 0 */ | |
3203 | if (req) { | |
9d8bab58 | 3204 | kfree(req->buf); |
1da177e4 LT |
3205 | usb_ep_free_request(fsg->ep0, req); |
3206 | } | |
3207 | ||
3208 | set_gadget_data(gadget, NULL); | |
3209 | } | |
3210 | ||
3211 | ||
3212 | static int __init check_parameters(struct fsg_dev *fsg) | |
3213 | { | |
3214 | int prot; | |
91e79c91 | 3215 | int gcnum; |
87eb1bea | 3216 | int i; |
1da177e4 LT |
3217 | |
3218 | /* Store the default values */ | |
3219 | mod_data.transport_type = USB_PR_BULK; | |
3220 | mod_data.transport_name = "Bulk-only"; | |
3221 | mod_data.protocol_type = USB_SC_SCSI; | |
3222 | mod_data.protocol_name = "Transparent SCSI"; | |
3223 | ||
ce459ec1 AS |
3224 | /* Some peripheral controllers are known not to be able to |
3225 | * halt bulk endpoints correctly. If one of them is present, | |
3226 | * disable stalls. | |
3227 | */ | |
90f79768 | 3228 | if (gadget_is_at91(fsg->gadget)) |
1da177e4 LT |
3229 | mod_data.can_stall = 0; |
3230 | ||
3231 | if (mod_data.release == 0xffff) { // Parameter wasn't set | |
90f79768 | 3232 | gcnum = usb_gadget_controller_number(fsg->gadget); |
91e79c91 DB |
3233 | if (gcnum >= 0) |
3234 | mod_data.release = 0x0300 + gcnum; | |
1da177e4 | 3235 | else { |
b6c63937 | 3236 | WARNING(fsg, "controller '%s' not recognized\n", |
1da177e4 LT |
3237 | fsg->gadget->name); |
3238 | mod_data.release = 0x0399; | |
3239 | } | |
3240 | } | |
3241 | ||
3242 | prot = simple_strtol(mod_data.protocol_parm, NULL, 0); | |
3243 | ||
3244 | #ifdef CONFIG_USB_FILE_STORAGE_TEST | |
3245 | if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) { | |
3246 | ; // Use default setting | |
3247 | } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) { | |
3248 | mod_data.transport_type = USB_PR_CB; | |
3249 | mod_data.transport_name = "Control-Bulk"; | |
3250 | } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) { | |
3251 | mod_data.transport_type = USB_PR_CBI; | |
3252 | mod_data.transport_name = "Control-Bulk-Interrupt"; | |
3253 | } else { | |
3254 | ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm); | |
3255 | return -EINVAL; | |
3256 | } | |
3257 | ||
3258 | if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 || | |
3259 | prot == USB_SC_SCSI) { | |
3260 | ; // Use default setting | |
3261 | } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 || | |
3262 | prot == USB_SC_RBC) { | |
3263 | mod_data.protocol_type = USB_SC_RBC; | |
3264 | mod_data.protocol_name = "RBC"; | |
3265 | } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 || | |
3266 | strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 || | |
3267 | prot == USB_SC_8020) { | |
3268 | mod_data.protocol_type = USB_SC_8020; | |
3269 | mod_data.protocol_name = "8020i (ATAPI)"; | |
3270 | } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 || | |
3271 | prot == USB_SC_QIC) { | |
3272 | mod_data.protocol_type = USB_SC_QIC; | |
3273 | mod_data.protocol_name = "QIC-157"; | |
3274 | } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 || | |
3275 | prot == USB_SC_UFI) { | |
3276 | mod_data.protocol_type = USB_SC_UFI; | |
3277 | mod_data.protocol_name = "UFI"; | |
3278 | } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 || | |
3279 | prot == USB_SC_8070) { | |
3280 | mod_data.protocol_type = USB_SC_8070; | |
3281 | mod_data.protocol_name = "8070i"; | |
3282 | } else { | |
3283 | ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm); | |
3284 | return -EINVAL; | |
3285 | } | |
3286 | ||
3287 | mod_data.buflen &= PAGE_CACHE_MASK; | |
3288 | if (mod_data.buflen <= 0) { | |
3289 | ERROR(fsg, "invalid buflen\n"); | |
3290 | return -ETOOSMALL; | |
3291 | } | |
87eb1bea | 3292 | |
56706491 MN |
3293 | #endif /* CONFIG_USB_FILE_STORAGE_TEST */ |
3294 | ||
87eb1bea YC |
3295 | /* Serial string handling. |
3296 | * On a real device, the serial string would be loaded | |
3297 | * from permanent storage. */ | |
56706491 | 3298 | if (mod_data.serial) { |
87eb1bea YC |
3299 | const char *ch; |
3300 | unsigned len = 0; | |
3301 | ||
3302 | /* Sanity check : | |
3303 | * The CB[I] specification limits the serial string to | |
3304 | * 12 uppercase hexadecimal characters. | |
3305 | * BBB need at least 12 uppercase hexadecimal characters, | |
3306 | * with a maximum of 126. */ | |
56706491 | 3307 | for (ch = mod_data.serial; *ch; ++ch) { |
87eb1bea YC |
3308 | ++len; |
3309 | if ((*ch < '0' || *ch > '9') && | |
3310 | (*ch < 'A' || *ch > 'F')) { /* not uppercase hex */ | |
3311 | WARNING(fsg, | |
3312 | "Invalid serial string character: %c; " | |
3313 | "Failing back to default\n", | |
3314 | *ch); | |
3315 | goto fill_serial; | |
3316 | } | |
3317 | } | |
3318 | if (len > 126 || | |
3319 | (mod_data.transport_type == USB_PR_BULK && len < 12) || | |
3320 | (mod_data.transport_type != USB_PR_BULK && len > 12)) { | |
3321 | WARNING(fsg, | |
3322 | "Invalid serial string length; " | |
3323 | "Failing back to default\n"); | |
3324 | goto fill_serial; | |
3325 | } | |
56706491 | 3326 | fsg_strings[FSG_STRING_SERIAL - 1].s = mod_data.serial; |
87eb1bea | 3327 | } else { |
56706491 MN |
3328 | WARNING(fsg, |
3329 | "Userspace failed to provide serial number; " | |
3330 | "Failing back to default\n"); | |
87eb1bea YC |
3331 | fill_serial: |
3332 | /* Serial number not specified or invalid, make our own. | |
3333 | * We just encode it from the driver version string, | |
3334 | * 12 characters to comply with both CB[I] and BBB spec. | |
3335 | * Warning : Two devices running the same kernel will have | |
3336 | * the same fallback serial number. */ | |
3337 | for (i = 0; i < 12; i += 2) { | |
3338 | unsigned char c = DRIVER_VERSION[i / 2]; | |
3339 | ||
3340 | if (!c) | |
3341 | break; | |
3342 | sprintf(&fsg_string_serial[i], "%02X", c); | |
3343 | } | |
3344 | } | |
3345 | ||
1da177e4 LT |
3346 | return 0; |
3347 | } | |
3348 | ||
3349 | ||
89ba85d4 | 3350 | static int __ref fsg_bind(struct usb_gadget *gadget) |
1da177e4 LT |
3351 | { |
3352 | struct fsg_dev *fsg = the_fsg; | |
3353 | int rc; | |
3354 | int i; | |
d6181702 | 3355 | struct fsg_lun *curlun; |
1da177e4 LT |
3356 | struct usb_ep *ep; |
3357 | struct usb_request *req; | |
3358 | char *pathbuf, *p; | |
3359 | ||
3360 | fsg->gadget = gadget; | |
3361 | set_gadget_data(gadget, fsg); | |
3362 | fsg->ep0 = gadget->ep0; | |
3363 | fsg->ep0->driver_data = fsg; | |
3364 | ||
3365 | if ((rc = check_parameters(fsg)) != 0) | |
3366 | goto out; | |
3367 | ||
3368 | if (mod_data.removable) { // Enable the store_xxx attributes | |
12aae68a | 3369 | dev_attr_file.attr.mode = 0644; |
93f93740 | 3370 | dev_attr_file.store = fsg_store_file; |
12aae68a AS |
3371 | if (!mod_data.cdrom) { |
3372 | dev_attr_ro.attr.mode = 0644; | |
93f93740 | 3373 | dev_attr_ro.store = fsg_store_ro; |
12aae68a | 3374 | } |
1da177e4 LT |
3375 | } |
3376 | ||
a93917d3 AS |
3377 | /* Only for removable media? */ |
3378 | dev_attr_nofua.attr.mode = 0644; | |
3379 | dev_attr_nofua.store = fsg_store_nofua; | |
3380 | ||
1da177e4 LT |
3381 | /* Find out how many LUNs there should be */ |
3382 | i = mod_data.nluns; | |
3383 | if (i == 0) | |
2e806f67 | 3384 | i = max(mod_data.num_filenames, 1u); |
d6181702 | 3385 | if (i > FSG_MAX_LUNS) { |
1da177e4 LT |
3386 | ERROR(fsg, "invalid number of LUNs: %d\n", i); |
3387 | rc = -EINVAL; | |
3388 | goto out; | |
3389 | } | |
3390 | ||
3391 | /* Create the LUNs, open their backing files, and register the | |
3392 | * LUN devices in sysfs. */ | |
d6181702 | 3393 | fsg->luns = kzalloc(i * sizeof(struct fsg_lun), GFP_KERNEL); |
1da177e4 LT |
3394 | if (!fsg->luns) { |
3395 | rc = -ENOMEM; | |
3396 | goto out; | |
3397 | } | |
1da177e4 LT |
3398 | fsg->nluns = i; |
3399 | ||
3400 | for (i = 0; i < fsg->nluns; ++i) { | |
3401 | curlun = &fsg->luns[i]; | |
e909ef5d MN |
3402 | curlun->cdrom = !!mod_data.cdrom; |
3403 | curlun->ro = mod_data.cdrom || mod_data.ro[i]; | |
3404 | curlun->initially_ro = curlun->ro; | |
3405 | curlun->removable = mod_data.removable; | |
a93917d3 | 3406 | curlun->nofua = mod_data.nofua[i]; |
2de9eaef | 3407 | curlun->dev.release = lun_release; |
1da177e4 LT |
3408 | curlun->dev.parent = &gadget->dev; |
3409 | curlun->dev.driver = &fsg_driver.driver; | |
93f93740 | 3410 | dev_set_drvdata(&curlun->dev, &fsg->filesem); |
0031a06e KS |
3411 | dev_set_name(&curlun->dev,"%s-lun%d", |
3412 | dev_name(&gadget->dev), i); | |
1da177e4 | 3413 | |
2de9eaef | 3414 | if ((rc = device_register(&curlun->dev)) != 0) { |
1da177e4 | 3415 | INFO(fsg, "failed to register LUN%d: %d\n", i, rc); |
2de9eaef AS |
3416 | goto out; |
3417 | } | |
3418 | if ((rc = device_create_file(&curlun->dev, | |
3419 | &dev_attr_ro)) != 0 || | |
a93917d3 AS |
3420 | (rc = device_create_file(&curlun->dev, |
3421 | &dev_attr_nofua)) != 0 || | |
2de9eaef AS |
3422 | (rc = device_create_file(&curlun->dev, |
3423 | &dev_attr_file)) != 0) { | |
3424 | device_unregister(&curlun->dev); | |
3425 | goto out; | |
1da177e4 | 3426 | } |
2de9eaef AS |
3427 | curlun->registered = 1; |
3428 | kref_get(&fsg->ref); | |
1da177e4 | 3429 | |
aafe5bd6 | 3430 | if (mod_data.file[i] && *mod_data.file[i]) { |
d6181702 | 3431 | if ((rc = fsg_lun_open(curlun, |
aafe5bd6 | 3432 | mod_data.file[i])) != 0) |
1da177e4 LT |
3433 | goto out; |
3434 | } else if (!mod_data.removable) { | |
3435 | ERROR(fsg, "no file given for LUN%d\n", i); | |
3436 | rc = -EINVAL; | |
3437 | goto out; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | /* Find all the endpoints we will use */ | |
3442 | usb_ep_autoconfig_reset(gadget); | |
d6181702 | 3443 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); |
1da177e4 LT |
3444 | if (!ep) |
3445 | goto autoconf_fail; | |
3446 | ep->driver_data = fsg; // claim the endpoint | |
3447 | fsg->bulk_in = ep; | |
3448 | ||
d6181702 | 3449 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc); |
1da177e4 LT |
3450 | if (!ep) |
3451 | goto autoconf_fail; | |
3452 | ep->driver_data = fsg; // claim the endpoint | |
3453 | fsg->bulk_out = ep; | |
3454 | ||
3455 | if (transport_is_cbi()) { | |
d6181702 | 3456 | ep = usb_ep_autoconfig(gadget, &fsg_fs_intr_in_desc); |
1da177e4 LT |
3457 | if (!ep) |
3458 | goto autoconf_fail; | |
3459 | ep->driver_data = fsg; // claim the endpoint | |
3460 | fsg->intr_in = ep; | |
3461 | } | |
3462 | ||
3463 | /* Fix up the descriptors */ | |
3464 | device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket; | |
3465 | device_desc.idVendor = cpu_to_le16(mod_data.vendor); | |
3466 | device_desc.idProduct = cpu_to_le16(mod_data.product); | |
3467 | device_desc.bcdDevice = cpu_to_le16(mod_data.release); | |
3468 | ||
3469 | i = (transport_is_cbi() ? 3 : 2); // Number of endpoints | |
d6181702 MN |
3470 | fsg_intf_desc.bNumEndpoints = i; |
3471 | fsg_intf_desc.bInterfaceSubClass = mod_data.protocol_type; | |
3472 | fsg_intf_desc.bInterfaceProtocol = mod_data.transport_type; | |
3473 | fsg_fs_function[i + FSG_FS_FUNCTION_PRE_EP_ENTRIES] = NULL; | |
1da177e4 | 3474 | |
2e806f67 | 3475 | if (gadget_is_dualspeed(gadget)) { |
d6181702 | 3476 | fsg_hs_function[i + FSG_HS_FUNCTION_PRE_EP_ENTRIES] = NULL; |
1da177e4 | 3477 | |
2e806f67 DB |
3478 | /* Assume ep0 uses the same maxpacket value for both speeds */ |
3479 | dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket; | |
1da177e4 | 3480 | |
2e806f67 | 3481 | /* Assume endpoint addresses are the same for both speeds */ |
d6181702 MN |
3482 | fsg_hs_bulk_in_desc.bEndpointAddress = |
3483 | fsg_fs_bulk_in_desc.bEndpointAddress; | |
3484 | fsg_hs_bulk_out_desc.bEndpointAddress = | |
3485 | fsg_fs_bulk_out_desc.bEndpointAddress; | |
3486 | fsg_hs_intr_in_desc.bEndpointAddress = | |
3487 | fsg_fs_intr_in_desc.bEndpointAddress; | |
2e806f67 | 3488 | } |
1da177e4 | 3489 | |
2e806f67 | 3490 | if (gadget_is_otg(gadget)) |
d6181702 | 3491 | fsg_otg_desc.bmAttributes |= USB_OTG_HNP; |
1da177e4 LT |
3492 | |
3493 | rc = -ENOMEM; | |
3494 | ||
3495 | /* Allocate the request and buffer for endpoint 0 */ | |
3496 | fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL); | |
3497 | if (!req) | |
3498 | goto out; | |
9d8bab58 | 3499 | req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL); |
1da177e4 LT |
3500 | if (!req->buf) |
3501 | goto out; | |
3502 | req->complete = ep0_complete; | |
3503 | ||
3504 | /* Allocate the data buffers */ | |
d6181702 | 3505 | for (i = 0; i < FSG_NUM_BUFFERS; ++i) { |
1da177e4 LT |
3506 | struct fsg_buffhd *bh = &fsg->buffhds[i]; |
3507 | ||
14cd5f8e AS |
3508 | /* Allocate for the bulk-in endpoint. We assume that |
3509 | * the buffer will also work with the bulk-out (and | |
3510 | * interrupt-in) endpoint. */ | |
9d8bab58 | 3511 | bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL); |
1da177e4 LT |
3512 | if (!bh->buf) |
3513 | goto out; | |
3514 | bh->next = bh + 1; | |
3515 | } | |
d6181702 | 3516 | fsg->buffhds[FSG_NUM_BUFFERS - 1].next = &fsg->buffhds[0]; |
1da177e4 LT |
3517 | |
3518 | /* This should reflect the actual gadget power source */ | |
3519 | usb_gadget_set_selfpowered(gadget); | |
3520 | ||
d6181702 MN |
3521 | snprintf(fsg_string_manufacturer, sizeof fsg_string_manufacturer, |
3522 | "%s %s with %s", | |
96b644bd | 3523 | init_utsname()->sysname, init_utsname()->release, |
1da177e4 LT |
3524 | gadget->name); |
3525 | ||
22efcf4a AS |
3526 | fsg->thread_task = kthread_create(fsg_main_thread, fsg, |
3527 | "file-storage-gadget"); | |
3528 | if (IS_ERR(fsg->thread_task)) { | |
3529 | rc = PTR_ERR(fsg->thread_task); | |
1da177e4 | 3530 | goto out; |
22efcf4a | 3531 | } |
1da177e4 LT |
3532 | |
3533 | INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); | |
3534 | INFO(fsg, "Number of LUNs=%d\n", fsg->nluns); | |
3535 | ||
3536 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); | |
3537 | for (i = 0; i < fsg->nluns; ++i) { | |
3538 | curlun = &fsg->luns[i]; | |
d6181702 | 3539 | if (fsg_lun_is_open(curlun)) { |
1da177e4 LT |
3540 | p = NULL; |
3541 | if (pathbuf) { | |
cf28b486 JB |
3542 | p = d_path(&curlun->filp->f_path, |
3543 | pathbuf, PATH_MAX); | |
1da177e4 LT |
3544 | if (IS_ERR(p)) |
3545 | p = NULL; | |
3546 | } | |
a93917d3 AS |
3547 | LINFO(curlun, "ro=%d, nofua=%d, file: %s\n", |
3548 | curlun->ro, curlun->nofua, (p ? p : "(error)")); | |
1da177e4 LT |
3549 | } |
3550 | } | |
3551 | kfree(pathbuf); | |
3552 | ||
3553 | DBG(fsg, "transport=%s (x%02x)\n", | |
3554 | mod_data.transport_name, mod_data.transport_type); | |
3555 | DBG(fsg, "protocol=%s (x%02x)\n", | |
3556 | mod_data.protocol_name, mod_data.protocol_type); | |
3557 | DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n", | |
3558 | mod_data.vendor, mod_data.product, mod_data.release); | |
12aae68a | 3559 | DBG(fsg, "removable=%d, stall=%d, cdrom=%d, buflen=%u\n", |
1da177e4 | 3560 | mod_data.removable, mod_data.can_stall, |
12aae68a | 3561 | mod_data.cdrom, mod_data.buflen); |
ba25f9dc | 3562 | DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task)); |
a922c687 AS |
3563 | |
3564 | set_bit(REGISTERED, &fsg->atomic_bitflags); | |
3565 | ||
3566 | /* Tell the thread to start working */ | |
3567 | wake_up_process(fsg->thread_task); | |
1da177e4 LT |
3568 | return 0; |
3569 | ||
3570 | autoconf_fail: | |
3571 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); | |
3572 | rc = -ENOTSUPP; | |
3573 | ||
3574 | out: | |
3575 | fsg->state = FSG_STATE_TERMINATED; // The thread is dead | |
3576 | fsg_unbind(gadget); | |
889394b1 | 3577 | complete(&fsg->thread_notifier); |
1da177e4 LT |
3578 | return rc; |
3579 | } | |
3580 | ||
3581 | ||
3582 | /*-------------------------------------------------------------------------*/ | |
3583 | ||
3584 | static void fsg_suspend(struct usb_gadget *gadget) | |
3585 | { | |
3586 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
3587 | ||
3588 | DBG(fsg, "suspend\n"); | |
3589 | set_bit(SUSPENDED, &fsg->atomic_bitflags); | |
3590 | } | |
3591 | ||
3592 | static void fsg_resume(struct usb_gadget *gadget) | |
3593 | { | |
3594 | struct fsg_dev *fsg = get_gadget_data(gadget); | |
3595 | ||
3596 | DBG(fsg, "resume\n"); | |
3597 | clear_bit(SUSPENDED, &fsg->atomic_bitflags); | |
3598 | } | |
3599 | ||
3600 | ||
3601 | /*-------------------------------------------------------------------------*/ | |
3602 | ||
3603 | static struct usb_gadget_driver fsg_driver = { | |
3604 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
3605 | .speed = USB_SPEED_HIGH, | |
3606 | #else | |
3607 | .speed = USB_SPEED_FULL, | |
3608 | #endif | |
d6181702 | 3609 | .function = (char *) fsg_string_product, |
1da177e4 | 3610 | .bind = fsg_bind, |
6bea476c | 3611 | .unbind = fsg_unbind, |
1da177e4 LT |
3612 | .disconnect = fsg_disconnect, |
3613 | .setup = fsg_setup, | |
3614 | .suspend = fsg_suspend, | |
3615 | .resume = fsg_resume, | |
3616 | ||
3617 | .driver = { | |
d6181702 | 3618 | .name = DRIVER_NAME, |
d0d5049f | 3619 | .owner = THIS_MODULE, |
1da177e4 LT |
3620 | // .release = ... |
3621 | // .suspend = ... | |
3622 | // .resume = ... | |
3623 | }, | |
3624 | }; | |
3625 | ||
3626 | ||
3627 | static int __init fsg_alloc(void) | |
3628 | { | |
3629 | struct fsg_dev *fsg; | |
3630 | ||
a922c687 | 3631 | fsg = kzalloc(sizeof *fsg, GFP_KERNEL); |
1da177e4 LT |
3632 | if (!fsg) |
3633 | return -ENOMEM; | |
1da177e4 LT |
3634 | spin_lock_init(&fsg->lock); |
3635 | init_rwsem(&fsg->filesem); | |
87c4252a | 3636 | kref_init(&fsg->ref); |
1da177e4 LT |
3637 | init_completion(&fsg->thread_notifier); |
3638 | ||
3639 | the_fsg = fsg; | |
3640 | return 0; | |
3641 | } | |
3642 | ||
3643 | ||
1da177e4 LT |
3644 | static int __init fsg_init(void) |
3645 | { | |
3646 | int rc; | |
3647 | struct fsg_dev *fsg; | |
3648 | ||
3649 | if ((rc = fsg_alloc()) != 0) | |
3650 | return rc; | |
3651 | fsg = the_fsg; | |
a922c687 | 3652 | if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) |
87c4252a | 3653 | kref_put(&fsg->ref, fsg_release); |
a922c687 | 3654 | return rc; |
1da177e4 LT |
3655 | } |
3656 | module_init(fsg_init); | |
3657 | ||
3658 | ||
3659 | static void __exit fsg_cleanup(void) | |
3660 | { | |
3661 | struct fsg_dev *fsg = the_fsg; | |
3662 | ||
3663 | /* Unregister the driver iff the thread hasn't already done so */ | |
3664 | if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) | |
3665 | usb_gadget_unregister_driver(&fsg_driver); | |
3666 | ||
3667 | /* Wait for the thread to finish up */ | |
3668 | wait_for_completion(&fsg->thread_notifier); | |
3669 | ||
87c4252a | 3670 | kref_put(&fsg->ref, fsg_release); |
1da177e4 LT |
3671 | } |
3672 | module_exit(fsg_cleanup); |