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[PATCH] w1: Decreased debug level.
[linux-2.6/verdex.git] / drivers / usb / gadget / file_storage.c
blob4f57085619b4fa26ea922e9c358f361210e4fc03
1 /*
2 * file_storage.c -- File-backed USB Storage Gadget, for USB development
3 *
4 * Copyright (C) 2003-2005 Alan Stern
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,
41 * appearing to the host as a disk drive. In addition to providing an
42 * example of a genuinely useful gadget driver for a USB device, it also
43 * illustrates a technique of double-buffering for increased throughput.
44 * Last but not least, it gives an easy way to probe the behavior of the
45 * Mass Storage drivers in a USB host.
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
49 * setting the optional "ro" module parameter. The gadget will indicate that
50 * it has removable media if the optional "removable" module parameter is set.
51 *
52 * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI),
53 * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected
54 * by the optional "transport" module parameter. It also supports the
55 * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03),
56 * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by
57 * the optional "protocol" module parameter. In addition, the default
58 * Vendor ID, Product ID, and release number can be overridden.
59 *
60 * There is support for multiple logical units (LUNs), each of which has
61 * its own backing file. The number of LUNs can be set using the optional
62 * "luns" module parameter (anywhere from 1 to 8), and the corresponding
63 * files are specified using comma-separated lists for "file" and "ro".
64 * The default number of LUNs is taken from the number of "file" elements;
65 * it is 1 if "file" is not given. If "removable" is not set then a backing
66 * file must be specified for each LUN. If it is set, then an unspecified
67 * or empty backing filename means the LUN's medium is not loaded.
68 *
69 * Requirements are modest; only a bulk-in and a bulk-out endpoint are
70 * needed (an interrupt-out endpoint is also needed for CBI). The memory
71 * requirement amounts to two 16K buffers, size configurable by a parameter.
72 * Support is included for both full-speed and high-speed operation.
73 *
74 * Module options:
75 *
76 * file=filename[,filename...]
77 * Required if "removable" is not set, names of
78 * the files or block devices used for
79 * backing storage
80 * ro=b[,b...] Default false, booleans for read-only access
81 * removable Default false, boolean for removable media
82 * luns=N Default N = number of filenames, number of
83 * LUNs to support
84 * stall Default determined according to the type of
85 * USB device controller (usually true),
86 * boolean to permit the driver to halt
87 * bulk endpoints
88 * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
89 * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
90 * ATAPI, QIC, UFI, 8070, or SCSI;
91 * also 1 - 6)
92 * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
93 * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
94 * release=0xRRRR Override the USB release number (bcdDevice)
95 * buflen=N Default N=16384, buffer size used (will be
96 * rounded down to a multiple of
97 * PAGE_CACHE_SIZE)
98 *
99 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
100 * "removable", "luns", and "stall" options are available; default values
101 * are used for everything else.
102 *
103 * The pathnames of the backing files and the ro settings are available in
104 * the attribute files "file" and "ro" in the lun<n> subdirectory of the
105 * gadget's sysfs directory. If the "removable" option is set, writing to
106 * these files will simulate ejecting/loading the medium (writing an empty
107 * line means eject) and adjusting a write-enable tab. Changes to the ro
108 * setting are not allowed when the medium is loaded.
109 *
110 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
111 */
112
113
114 /*
115 * Driver Design
116 *
117 * The FSG driver is fairly straightforward. There is a main kernel
118 * thread that handles most of the work. Interrupt routines field
119 * callbacks from the controller driver: bulk- and interrupt-request
120 * completion notifications, endpoint-0 events, and disconnect events.
121 * Completion events are passed to the main thread by wakeup calls. Many
122 * ep0 requests are handled at interrupt time, but SetInterface,
123 * SetConfiguration, and device reset requests are forwarded to the
124 * thread in the form of "exceptions" using SIGUSR1 signals (since they
125 * should interrupt any ongoing file I/O operations).
126 *
127 * The thread's main routine implements the standard command/data/status
128 * parts of a SCSI interaction. It and its subroutines are full of tests
129 * for pending signals/exceptions -- all this polling is necessary since
130 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
131 * indication that the driver really wants to be running in userspace.)
132 * An important point is that so long as the thread is alive it keeps an
133 * open reference to the backing file. This will prevent unmounting
134 * the backing file's underlying filesystem and could cause problems
135 * during system shutdown, for example. To prevent such problems, the
136 * thread catches INT, TERM, and KILL signals and converts them into
137 * an EXIT exception.
138 *
139 * In normal operation the main thread is started during the gadget's
140 * fsg_bind() callback and stopped during fsg_unbind(). But it can also
141 * exit when it receives a signal, and there's no point leaving the
142 * gadget running when the thread is dead. So just before the thread
143 * exits, it deregisters the gadget driver. This makes things a little
144 * tricky: The driver is deregistered at two places, and the exiting
145 * thread can indirectly call fsg_unbind() which in turn can tell the
146 * thread to exit. The first problem is resolved through the use of the
147 * REGISTERED atomic bitflag; the driver will only be deregistered once.
148 * The second problem is resolved by having fsg_unbind() check
149 * fsg->state; it won't try to stop the thread if the state is already
150 * FSG_STATE_TERMINATED.
151 *
152 * To provide maximum throughput, the driver uses a circular pipeline of
153 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
154 * arbitrarily long; in practice the benefits don't justify having more
155 * than 2 stages (i.e., double buffering). But it helps to think of the
156 * pipeline as being a long one. Each buffer head contains a bulk-in and
157 * a bulk-out request pointer (since the buffer can be used for both
158 * output and input -- directions always are given from the host's
159 * point of view) as well as a pointer to the buffer and various state
160 * variables.
161 *
162 * Use of the pipeline follows a simple protocol. There is a variable
163 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
164 * At any time that buffer head may still be in use from an earlier
165 * request, so each buffer head has a state variable indicating whether
166 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
167 * buffer head to be EMPTY, filling the buffer either by file I/O or by
168 * USB I/O (during which the buffer head is BUSY), and marking the buffer
169 * head FULL when the I/O is complete. Then the buffer will be emptied
170 * (again possibly by USB I/O, during which it is marked BUSY) and
171 * finally marked EMPTY again (possibly by a completion routine).
172 *
173 * A module parameter tells the driver to avoid stalling the bulk
174 * endpoints wherever the transport specification allows. This is
175 * necessary for some UDCs like the SuperH, which cannot reliably clear a
176 * halt on a bulk endpoint. However, under certain circumstances the
177 * Bulk-only specification requires a stall. In such cases the driver
178 * will halt the endpoint and set a flag indicating that it should clear
179 * the halt in software during the next device reset. Hopefully this
180 * will permit everything to work correctly. Furthermore, although the
181 * specification allows the bulk-out endpoint to halt when the host sends
182 * too much data, implementing this would cause an unavoidable race.
183 * The driver will always use the "no-stall" approach for OUT transfers.
184 *
185 * One subtle point concerns sending status-stage responses for ep0
186 * requests. Some of these requests, such as device reset, can involve
187 * interrupting an ongoing file I/O operation, which might take an
188 * arbitrarily long time. During that delay the host might give up on
189 * the original ep0 request and issue a new one. When that happens the
190 * driver should not notify the host about completion of the original
191 * request, as the host will no longer be waiting for it. So the driver
192 * assigns to each ep0 request a unique tag, and it keeps track of the
193 * tag value of the request associated with a long-running exception
194 * (device-reset, interface-change, or configuration-change). When the
195 * exception handler is finished, the status-stage response is submitted
196 * only if the current ep0 request tag is equal to the exception request
197 * tag. Thus only the most recently received ep0 request will get a
198 * status-stage response.
199 *
200 * Warning: This driver source file is too long. It ought to be split up
201 * into a header file plus about 3 separate .c files, to handle the details
202 * of the Gadget, USB Mass Storage, and SCSI protocols.
203 */
204
205
206 #undef DEBUG
207 #undef VERBOSE
208 #undef DUMP_MSGS
209
210 #include <linux/config.h>
211
212 #include <asm/system.h>
213 #include <asm/uaccess.h>
214
215 #include <linux/bitops.h>
216 #include <linux/blkdev.h>
217 #include <linux/compiler.h>
218 #include <linux/completion.h>
219 #include <linux/dcache.h>
220 #include <linux/delay.h>
221 #include <linux/device.h>
222 #include <linux/fcntl.h>
223 #include <linux/file.h>
224 #include <linux/fs.h>
225 #include <linux/init.h>
226 #include <linux/kernel.h>
227 #include <linux/limits.h>
228 #include <linux/list.h>
229 #include <linux/module.h>
230 #include <linux/moduleparam.h>
231 #include <linux/pagemap.h>
232 #include <linux/rwsem.h>
233 #include <linux/sched.h>
234 #include <linux/signal.h>
235 #include <linux/slab.h>
236 #include <linux/spinlock.h>
237 #include <linux/string.h>
238 #include <linux/suspend.h>
239 #include <linux/utsname.h>
240 #include <linux/wait.h>
241
242 #include <linux/usb_ch9.h>
243 #include <linux/usb_gadget.h>
244
245 #include "gadget_chips.h"
246
247
248 /*-------------------------------------------------------------------------*/
249
250 #define DRIVER_DESC "File-backed Storage Gadget"
251 #define DRIVER_NAME "g_file_storage"
252 #define DRIVER_VERSION "20 October 2004"
253
254 static const char longname[] = DRIVER_DESC;
255 static const char shortname[] = DRIVER_NAME;
256
257 MODULE_DESCRIPTION(DRIVER_DESC);
258 MODULE_AUTHOR("Alan Stern");
259 MODULE_LICENSE("Dual BSD/GPL");
260
261 /* Thanks to NetChip Technologies for donating this product ID.
262 *
263 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
264 * Instead: allocate your own, using normal USB-IF procedures. */
265 #define DRIVER_VENDOR_ID 0x0525 // NetChip
266 #define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
267
268
269 /*
270 * This driver assumes self-powered hardware and has no way for users to
271 * trigger remote wakeup. It uses autoconfiguration to select endpoints
272 * and endpoint addresses.
273 */
274
275
276 /*-------------------------------------------------------------------------*/
277
278 #define xprintk(f,level,fmt,args...) \
279 dev_printk(level , &(f)->gadget->dev , fmt , ## args)
280 #define yprintk(l,level,fmt,args...) \
281 dev_printk(level , &(l)->dev , fmt , ## args)
282
283 #ifdef DEBUG
284 #define DBG(fsg,fmt,args...) \
285 xprintk(fsg , KERN_DEBUG , fmt , ## args)
286 #define LDBG(lun,fmt,args...) \
287 yprintk(lun , KERN_DEBUG , fmt , ## args)
288 #define MDBG(fmt,args...) \
289 printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
290 #else
291 #define DBG(fsg,fmt,args...) \
292 do { } while (0)
293 #define LDBG(lun,fmt,args...) \
294 do { } while (0)
295 #define MDBG(fmt,args...) \
296 do { } while (0)
297 #undef VERBOSE
298 #undef DUMP_MSGS
299 #endif /* DEBUG */
300
301 #ifdef VERBOSE
302 #define VDBG DBG
303 #define VLDBG LDBG
304 #else
305 #define VDBG(fsg,fmt,args...) \
306 do { } while (0)
307 #define VLDBG(lun,fmt,args...) \
308 do { } while (0)
309 #endif /* VERBOSE */
310
311 #define ERROR(fsg,fmt,args...) \
312 xprintk(fsg , KERN_ERR , fmt , ## args)
313 #define LERROR(lun,fmt,args...) \
314 yprintk(lun , KERN_ERR , fmt , ## args)
315
316 #define WARN(fsg,fmt,args...) \
317 xprintk(fsg , KERN_WARNING , fmt , ## args)
318 #define LWARN(lun,fmt,args...) \
319 yprintk(lun , KERN_WARNING , fmt , ## args)
320
321 #define INFO(fsg,fmt,args...) \
322 xprintk(fsg , KERN_INFO , fmt , ## args)
323 #define LINFO(lun,fmt,args...) \
324 yprintk(lun , KERN_INFO , fmt , ## args)
325
326 #define MINFO(fmt,args...) \
327 printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
328
329
330 /*-------------------------------------------------------------------------*/
331
332 /* Encapsulate the module parameter settings */
333
334 #define MAX_LUNS 8
335
336 /* Arggh! There should be a module_param_array_named macro! */
337 static char *file[MAX_LUNS] = {NULL, };
338 static int ro[MAX_LUNS] = {0, };
339
340 static struct {
341 int num_filenames;
342 int num_ros;
343 unsigned int nluns;
344
345 int removable;
346 int can_stall;
347
348 char *transport_parm;
349 char *protocol_parm;
350 unsigned short vendor;
351 unsigned short product;
352 unsigned short release;
353 unsigned int buflen;
354
355 int transport_type;
356 char *transport_name;
357 int protocol_type;
358 char *protocol_name;
359
360 } mod_data = { // Default values
361 .transport_parm = "BBB",
362 .protocol_parm = "SCSI",
363 .removable = 0,
364 .can_stall = 1,
365 .vendor = DRIVER_VENDOR_ID,
366 .product = DRIVER_PRODUCT_ID,
367 .release = 0xffff, // Use controller chip type
368 .buflen = 16384,
369 };
370
371
372 module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
373 MODULE_PARM_DESC(file, "names of backing files or devices");
374
375 module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
376 MODULE_PARM_DESC(ro, "true to force read-only");
377
378 module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
379 MODULE_PARM_DESC(luns, "number of LUNs");
380
381 module_param_named(removable, mod_data.removable, bool, S_IRUGO);
382 MODULE_PARM_DESC(removable, "true to simulate removable media");
383
384 module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
385 MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
386
387
388 /* In the non-TEST version, only the module parameters listed above
389 * are available. */
390 #ifdef CONFIG_USB_FILE_STORAGE_TEST
391
392 module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
393 MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
394
395 module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
396 MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
397 "8070, or SCSI)");
398
399 module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
400 MODULE_PARM_DESC(vendor, "USB Vendor ID");
401
402 module_param_named(product, mod_data.product, ushort, S_IRUGO);
403 MODULE_PARM_DESC(product, "USB Product ID");
404
405 module_param_named(release, mod_data.release, ushort, S_IRUGO);
406 MODULE_PARM_DESC(release, "USB release number");
407
408 module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
409 MODULE_PARM_DESC(buflen, "I/O buffer size");
410
411 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
412
413
414 /*-------------------------------------------------------------------------*/
415
416 /* USB protocol value = the transport method */
417 #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
418 #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
419 #define USB_PR_BULK 0x50 // Bulk-only
420
421 /* USB subclass value = the protocol encapsulation */
422 #define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
423 #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
424 #define USB_SC_QIC 0x03 // QIC-157 (tape)
425 #define USB_SC_UFI 0x04 // UFI (floppy)
426 #define USB_SC_8070 0x05 // SFF-8070i (removable)
427 #define USB_SC_SCSI 0x06 // Transparent SCSI
428
429 /* Bulk-only data structures */
430
431 /* Command Block Wrapper */
432 struct bulk_cb_wrap {
433 __le32 Signature; // Contains 'USBC'
434 u32 Tag; // Unique per command id
435 __le32 DataTransferLength; // Size of the data
436 u8 Flags; // Direction in bit 7
437 u8 Lun; // LUN (normally 0)
438 u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
439 u8 CDB[16]; // Command Data Block
440 };
441
442 #define USB_BULK_CB_WRAP_LEN 31
443 #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
444 #define USB_BULK_IN_FLAG 0x80
445
446 /* Command Status Wrapper */
447 struct bulk_cs_wrap {
448 __le32 Signature; // Should = 'USBS'
449 u32 Tag; // Same as original command
450 __le32 Residue; // Amount not transferred
451 u8 Status; // See below
452 };
453
454 #define USB_BULK_CS_WRAP_LEN 13
455 #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
456 #define USB_STATUS_PASS 0
457 #define USB_STATUS_FAIL 1
458 #define USB_STATUS_PHASE_ERROR 2
459
460 /* Bulk-only class specific requests */
461 #define USB_BULK_RESET_REQUEST 0xff
462 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
463
464
465 /* CBI Interrupt data structure */
466 struct interrupt_data {
467 u8 bType;
468 u8 bValue;
469 };
470
471 #define CBI_INTERRUPT_DATA_LEN 2
472
473 /* CBI Accept Device-Specific Command request */
474 #define USB_CBI_ADSC_REQUEST 0x00
475
476
477 #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
478
479 /* SCSI commands that we recognize */
480 #define SC_FORMAT_UNIT 0x04
481 #define SC_INQUIRY 0x12
482 #define SC_MODE_SELECT_6 0x15
483 #define SC_MODE_SELECT_10 0x55
484 #define SC_MODE_SENSE_6 0x1a
485 #define SC_MODE_SENSE_10 0x5a
486 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
487 #define SC_READ_6 0x08
488 #define SC_READ_10 0x28
489 #define SC_READ_12 0xa8
490 #define SC_READ_CAPACITY 0x25
491 #define SC_READ_FORMAT_CAPACITIES 0x23
492 #define SC_RELEASE 0x17
493 #define SC_REQUEST_SENSE 0x03
494 #define SC_RESERVE 0x16
495 #define SC_SEND_DIAGNOSTIC 0x1d
496 #define SC_START_STOP_UNIT 0x1b
497 #define SC_SYNCHRONIZE_CACHE 0x35
498 #define SC_TEST_UNIT_READY 0x00
499 #define SC_VERIFY 0x2f
500 #define SC_WRITE_6 0x0a
501 #define SC_WRITE_10 0x2a
502 #define SC_WRITE_12 0xaa
503
504 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
505 #define SS_NO_SENSE 0
506 #define SS_COMMUNICATION_FAILURE 0x040800
507 #define SS_INVALID_COMMAND 0x052000
508 #define SS_INVALID_FIELD_IN_CDB 0x052400
509 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
510 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
511 #define SS_MEDIUM_NOT_PRESENT 0x023a00
512 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
513 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
514 #define SS_RESET_OCCURRED 0x062900
515 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
516 #define SS_UNRECOVERED_READ_ERROR 0x031100
517 #define SS_WRITE_ERROR 0x030c02
518 #define SS_WRITE_PROTECTED 0x072700
519
520 #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
521 #define ASC(x) ((u8) ((x) >> 8))
522 #define ASCQ(x) ((u8) (x))
523
524
525 /*-------------------------------------------------------------------------*/
526
527 /*
528 * These definitions will permit the compiler to avoid generating code for
529 * parts of the driver that aren't used in the non-TEST version. Even gcc
530 * can recognize when a test of a constant expression yields a dead code
531 * path.
532 */
533
534 #ifdef CONFIG_USB_FILE_STORAGE_TEST
535
536 #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
537 #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
538 #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
539
540 #else
541
542 #define transport_is_bbb() 1
543 #define transport_is_cbi() 0
544 #define protocol_is_scsi() 1
545
546 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
547
548
549 struct lun {
550 struct file *filp;
551 loff_t file_length;
552 loff_t num_sectors;
553
554 unsigned int ro : 1;
555 unsigned int prevent_medium_removal : 1;
556 unsigned int registered : 1;
557
558 u32 sense_data;
559 u32 sense_data_info;
560 u32 unit_attention_data;
561
562 struct device dev;
563 };
564
565 #define backing_file_is_open(curlun) ((curlun)->filp != NULL)
566
567 static inline struct lun *dev_to_lun(struct device *dev)
568 {
569 return container_of(dev, struct lun, dev);
570 }
571
572
573 /* Big enough to hold our biggest descriptor */
574 #define EP0_BUFSIZE 256
575 #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
576
577 /* Number of buffers we will use. 2 is enough for double-buffering */
578 #define NUM_BUFFERS 2
579
580 enum fsg_buffer_state {
581 BUF_STATE_EMPTY = 0,
582 BUF_STATE_FULL,
583 BUF_STATE_BUSY
584 };
585
586 struct fsg_buffhd {
587 void *buf;
588 dma_addr_t dma;
589 volatile enum fsg_buffer_state state;
590 struct fsg_buffhd *next;
591
592 /* The NetChip 2280 is faster, and handles some protocol faults
593 * better, if we don't submit any short bulk-out read requests.
594 * So we will record the intended request length here. */
595 unsigned int bulk_out_intended_length;
596
597 struct usb_request *inreq;
598 volatile int inreq_busy;
599 struct usb_request *outreq;
600 volatile int outreq_busy;
601 };
602
603 enum fsg_state {
604 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
605 FSG_STATE_DATA_PHASE,
606 FSG_STATE_STATUS_PHASE,
607
608 FSG_STATE_IDLE = 0,
609 FSG_STATE_ABORT_BULK_OUT,
610 FSG_STATE_RESET,
611 FSG_STATE_INTERFACE_CHANGE,
612 FSG_STATE_CONFIG_CHANGE,
613 FSG_STATE_DISCONNECT,
614 FSG_STATE_EXIT,
615 FSG_STATE_TERMINATED
616 };
617
618 enum data_direction {
619 DATA_DIR_UNKNOWN = 0,
620 DATA_DIR_FROM_HOST,
621 DATA_DIR_TO_HOST,
622 DATA_DIR_NONE
623 };
624
625 struct fsg_dev {
626 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
627 spinlock_t lock;
628 struct usb_gadget *gadget;
629
630 /* filesem protects: backing files in use */
631 struct rw_semaphore filesem;
632
633 struct usb_ep *ep0; // Handy copy of gadget->ep0
634 struct usb_request *ep0req; // For control responses
635 volatile unsigned int ep0_req_tag;
636 const char *ep0req_name;
637
638 struct usb_request *intreq; // For interrupt responses
639 volatile int intreq_busy;
640 struct fsg_buffhd *intr_buffhd;
641
642 unsigned int bulk_out_maxpacket;
643 enum fsg_state state; // For exception handling
644 unsigned int exception_req_tag;
645
646 u8 config, new_config;
647
648 unsigned int running : 1;
649 unsigned int bulk_in_enabled : 1;
650 unsigned int bulk_out_enabled : 1;
651 unsigned int intr_in_enabled : 1;
652 unsigned int phase_error : 1;
653 unsigned int short_packet_received : 1;
654 unsigned int bad_lun_okay : 1;
655
656 unsigned long atomic_bitflags;
657 #define REGISTERED 0
658 #define CLEAR_BULK_HALTS 1
659 #define SUSPENDED 2
660
661 struct usb_ep *bulk_in;
662 struct usb_ep *bulk_out;
663 struct usb_ep *intr_in;
664
665 struct fsg_buffhd *next_buffhd_to_fill;
666 struct fsg_buffhd *next_buffhd_to_drain;
667 struct fsg_buffhd buffhds[NUM_BUFFERS];
668
669 wait_queue_head_t thread_wqh;
670 int thread_wakeup_needed;
671 struct completion thread_notifier;
672 int thread_pid;
673 struct task_struct *thread_task;
674 sigset_t thread_signal_mask;
675
676 int cmnd_size;
677 u8 cmnd[MAX_COMMAND_SIZE];
678 enum data_direction data_dir;
679 u32 data_size;
680 u32 data_size_from_cmnd;
681 u32 tag;
682 unsigned int lun;
683 u32 residue;
684 u32 usb_amount_left;
685
686 /* The CB protocol offers no way for a host to know when a command
687 * has completed. As a result the next command may arrive early,
688 * and we will still have to handle it. For that reason we need
689 * a buffer to store new commands when using CB (or CBI, which
690 * does not oblige a host to wait for command completion either). */
691 int cbbuf_cmnd_size;
692 u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
693
694 unsigned int nluns;
695 struct lun *luns;
696 struct lun *curlun;
697 struct completion lun_released;
698 };
699
700 typedef void (*fsg_routine_t)(struct fsg_dev *);
701
702 static int inline exception_in_progress(struct fsg_dev *fsg)
703 {
704 return (fsg->state > FSG_STATE_IDLE);
705 }
706
707 /* Make bulk-out requests be divisible by the maxpacket size */
708 static void inline set_bulk_out_req_length(struct fsg_dev *fsg,
709 struct fsg_buffhd *bh, unsigned int length)
710 {
711 unsigned int rem;
712
713 bh->bulk_out_intended_length = length;
714 rem = length % fsg->bulk_out_maxpacket;
715 if (rem > 0)
716 length += fsg->bulk_out_maxpacket - rem;
717 bh->outreq->length = length;
718 }
719
720 static struct fsg_dev *the_fsg;
721 static struct usb_gadget_driver fsg_driver;
722
723 static void close_backing_file(struct lun *curlun);
724 static void close_all_backing_files(struct fsg_dev *fsg);
725
726
727 /*-------------------------------------------------------------------------*/
728
729 #ifdef DUMP_MSGS
730
731 static void dump_msg(struct fsg_dev *fsg, const char *label,
732 const u8 *buf, unsigned int length)
733 {
734 unsigned int start, num, i;
735 char line[52], *p;
736
737 if (length >= 512)
738 return;
739 DBG(fsg, "%s, length %u:\n", label, length);
740
741 start = 0;
742 while (length > 0) {
743 num = min(length, 16u);
744 p = line;
745 for (i = 0; i < num; ++i) {
746 if (i == 8)
747 *p++ = ' ';
748 sprintf(p, " %02x", buf[i]);
749 p += 3;
750 }
751 *p = 0;
752 printk(KERN_DEBUG "%6x: %s\n", start, line);
753 buf += num;
754 start += num;
755 length -= num;
756 }
757 }
758
759 static void inline dump_cdb(struct fsg_dev *fsg)
760 {}
761
762 #else
763
764 static void inline dump_msg(struct fsg_dev *fsg, const char *label,
765 const u8 *buf, unsigned int length)
766 {}
767
768 static void inline dump_cdb(struct fsg_dev *fsg)
769 {
770 int i;
771 char cmdbuf[3*MAX_COMMAND_SIZE + 1];
772
773 for (i = 0; i < fsg->cmnd_size; ++i)
774 sprintf(cmdbuf + i*3, " %02x", fsg->cmnd[i]);
775 VDBG(fsg, "SCSI CDB: %s\n", cmdbuf);
776 }
777
778 #endif /* DUMP_MSGS */
779
780
781 static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
782 {
783 const char *name;
784
785 if (ep == fsg->bulk_in)
786 name = "bulk-in";
787 else if (ep == fsg->bulk_out)
788 name = "bulk-out";
789 else
790 name = ep->name;
791 DBG(fsg, "%s set halt\n", name);
792 return usb_ep_set_halt(ep);
793 }
794
795
796 /*-------------------------------------------------------------------------*/
797
798 /* Routines for unaligned data access */
799
800 static u16 inline get_be16(u8 *buf)
801 {
802 return ((u16) buf[0] << 8) | ((u16) buf[1]);
803 }
804
805 static u32 inline get_be32(u8 *buf)
806 {
807 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
808 ((u32) buf[2] << 8) | ((u32) buf[3]);
809 }
810
811 static void inline put_be16(u8 *buf, u16 val)
812 {
813 buf[0] = val >> 8;
814 buf[1] = val;
815 }
816
817 static void inline put_be32(u8 *buf, u32 val)
818 {
819 buf[0] = val >> 24;
820 buf[1] = val >> 16;
821 buf[2] = val >> 8;
822 buf[3] = val & 0xff;
823 }
824
825
826 /*-------------------------------------------------------------------------*/
827
828 /*
829 * DESCRIPTORS ... most are static, but strings and (full) configuration
830 * descriptors are built on demand. Also the (static) config and interface
831 * descriptors are adjusted during fsg_bind().
832 */
833 #define STRING_MANUFACTURER 1
834 #define STRING_PRODUCT 2
835 #define STRING_SERIAL 3
836 #define STRING_CONFIG 4
837 #define STRING_INTERFACE 5
838
839 /* There is only one configuration. */
840 #define CONFIG_VALUE 1
841
842 static struct usb_device_descriptor
843 device_desc = {
844 .bLength = sizeof device_desc,
845 .bDescriptorType = USB_DT_DEVICE,
846
847 .bcdUSB = __constant_cpu_to_le16(0x0200),
848 .bDeviceClass = USB_CLASS_PER_INTERFACE,
849
850 /* The next three values can be overridden by module parameters */
851 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
852 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
853 .bcdDevice = __constant_cpu_to_le16(0xffff),
854
855 .iManufacturer = STRING_MANUFACTURER,
856 .iProduct = STRING_PRODUCT,
857 .iSerialNumber = STRING_SERIAL,
858 .bNumConfigurations = 1,
859 };
860
861 static struct usb_config_descriptor
862 config_desc = {
863 .bLength = sizeof config_desc,
864 .bDescriptorType = USB_DT_CONFIG,
865
866 /* wTotalLength computed by usb_gadget_config_buf() */
867 .bNumInterfaces = 1,
868 .bConfigurationValue = CONFIG_VALUE,
869 .iConfiguration = STRING_CONFIG,
870 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
871 .bMaxPower = 1, // self-powered
872 };
873
874 static struct usb_otg_descriptor
875 otg_desc = {
876 .bLength = sizeof(otg_desc),
877 .bDescriptorType = USB_DT_OTG,
878
879 .bmAttributes = USB_OTG_SRP,
880 };
881
882 /* There is only one interface. */
883
884 static struct usb_interface_descriptor
885 intf_desc = {
886 .bLength = sizeof intf_desc,
887 .bDescriptorType = USB_DT_INTERFACE,
888
889 .bNumEndpoints = 2, // Adjusted during fsg_bind()
890 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
891 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
892 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
893 .iInterface = STRING_INTERFACE,
894 };
895
896 /* Three full-speed endpoint descriptors: bulk-in, bulk-out,
897 * and interrupt-in. */
898
899 static struct usb_endpoint_descriptor
900 fs_bulk_in_desc = {
901 .bLength = USB_DT_ENDPOINT_SIZE,
902 .bDescriptorType = USB_DT_ENDPOINT,
903
904 .bEndpointAddress = USB_DIR_IN,
905 .bmAttributes = USB_ENDPOINT_XFER_BULK,
906 /* wMaxPacketSize set by autoconfiguration */
907 };
908
909 static struct usb_endpoint_descriptor
910 fs_bulk_out_desc = {
911 .bLength = USB_DT_ENDPOINT_SIZE,
912 .bDescriptorType = USB_DT_ENDPOINT,
913
914 .bEndpointAddress = USB_DIR_OUT,
915 .bmAttributes = USB_ENDPOINT_XFER_BULK,
916 /* wMaxPacketSize set by autoconfiguration */
917 };
918
919 static struct usb_endpoint_descriptor
920 fs_intr_in_desc = {
921 .bLength = USB_DT_ENDPOINT_SIZE,
922 .bDescriptorType = USB_DT_ENDPOINT,
923
924 .bEndpointAddress = USB_DIR_IN,
925 .bmAttributes = USB_ENDPOINT_XFER_INT,
926 .wMaxPacketSize = __constant_cpu_to_le16(2),
927 .bInterval = 32, // frames -> 32 ms
928 };
929
930 static const struct usb_descriptor_header *fs_function[] = {
931 (struct usb_descriptor_header *) &otg_desc,
932 (struct usb_descriptor_header *) &intf_desc,
933 (struct usb_descriptor_header *) &fs_bulk_in_desc,
934 (struct usb_descriptor_header *) &fs_bulk_out_desc,
935 (struct usb_descriptor_header *) &fs_intr_in_desc,
936 NULL,
937 };
938 #define FS_FUNCTION_PRE_EP_ENTRIES 2
939
940
941 #ifdef CONFIG_USB_GADGET_DUALSPEED
942
943 /*
944 * USB 2.0 devices need to expose both high speed and full speed
945 * descriptors, unless they only run at full speed.
946 *
947 * That means alternate endpoint descriptors (bigger packets)
948 * and a "device qualifier" ... plus more construction options
949 * for the config descriptor.
950 */
951 static struct usb_qualifier_descriptor
952 dev_qualifier = {
953 .bLength = sizeof dev_qualifier,
954 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
955
956 .bcdUSB = __constant_cpu_to_le16(0x0200),
957 .bDeviceClass = USB_CLASS_PER_INTERFACE,
958
959 .bNumConfigurations = 1,
960 };
961
962 static struct usb_endpoint_descriptor
963 hs_bulk_in_desc = {
964 .bLength = USB_DT_ENDPOINT_SIZE,
965 .bDescriptorType = USB_DT_ENDPOINT,
966
967 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
968 .bmAttributes = USB_ENDPOINT_XFER_BULK,
969 .wMaxPacketSize = __constant_cpu_to_le16(512),
970 };
971
972 static struct usb_endpoint_descriptor
973 hs_bulk_out_desc = {
974 .bLength = USB_DT_ENDPOINT_SIZE,
975 .bDescriptorType = USB_DT_ENDPOINT,
976
977 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
978 .bmAttributes = USB_ENDPOINT_XFER_BULK,
979 .wMaxPacketSize = __constant_cpu_to_le16(512),
980 .bInterval = 1, // NAK every 1 uframe
981 };
982
983 static struct usb_endpoint_descriptor
984 hs_intr_in_desc = {
985 .bLength = USB_DT_ENDPOINT_SIZE,
986 .bDescriptorType = USB_DT_ENDPOINT,
987
988 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
989 .bmAttributes = USB_ENDPOINT_XFER_INT,
990 .wMaxPacketSize = __constant_cpu_to_le16(2),
991 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
992 };
993
994 static const struct usb_descriptor_header *hs_function[] = {
995 (struct usb_descriptor_header *) &otg_desc,
996 (struct usb_descriptor_header *) &intf_desc,
997 (struct usb_descriptor_header *) &hs_bulk_in_desc,
998 (struct usb_descriptor_header *) &hs_bulk_out_desc,
999 (struct usb_descriptor_header *) &hs_intr_in_desc,
1000 NULL,
1001 };
1002 #define HS_FUNCTION_PRE_EP_ENTRIES 2
1003
1004 /* Maxpacket and other transfer characteristics vary by speed. */
1005 #define ep_desc(g,fs,hs) (((g)->speed==USB_SPEED_HIGH) ? (hs) : (fs))
1006
1007 #else
1008
1009 /* If there's no high speed support, always use the full-speed descriptor. */
1010 #define ep_desc(g,fs,hs) fs
1011
1012 #endif /* !CONFIG_USB_GADGET_DUALSPEED */
1013
1014
1015 /* The CBI specification limits the serial string to 12 uppercase hexadecimal
1016 * characters. */
1017 static char manufacturer[64];
1018 static char serial[13];
1019
1020 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1021 static struct usb_string strings[] = {
1022 {STRING_MANUFACTURER, manufacturer},
1023 {STRING_PRODUCT, longname},
1024 {STRING_SERIAL, serial},
1025 {STRING_CONFIG, "Self-powered"},
1026 {STRING_INTERFACE, "Mass Storage"},
1027 {}
1028 };
1029
1030 static struct usb_gadget_strings stringtab = {
1031 .language = 0x0409, // en-us
1032 .strings = strings,
1033 };
1034
1035
1036 /*
1037 * Config descriptors must agree with the code that sets configurations
1038 * and with code managing interfaces and their altsettings. They must
1039 * also handle different speeds and other-speed requests.
1040 */
1041 static int populate_config_buf(struct usb_gadget *gadget,
1042 u8 *buf, u8 type, unsigned index)
1043 {
1044 #ifdef CONFIG_USB_GADGET_DUALSPEED
1045 enum usb_device_speed speed = gadget->speed;
1046 #endif
1047 int len;
1048 const struct usb_descriptor_header **function;
1049
1050 if (index > 0)
1051 return -EINVAL;
1052
1053 #ifdef CONFIG_USB_GADGET_DUALSPEED
1054 if (type == USB_DT_OTHER_SPEED_CONFIG)
1055 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1056 if (speed == USB_SPEED_HIGH)
1057 function = hs_function;
1058 else
1059 #endif
1060 function = fs_function;
1061
1062 /* for now, don't advertise srp-only devices */
1063 if (!gadget->is_otg)
1064 function++;
1065
1066 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1067 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1068 return len;
1069 }
1070
1071
1072 /*-------------------------------------------------------------------------*/
1073
1074 /* These routines may be called in process context or in_irq */
1075
1076 static void wakeup_thread(struct fsg_dev *fsg)
1077 {
1078 /* Tell the main thread that something has happened */
1079 fsg->thread_wakeup_needed = 1;
1080 wake_up_all(&fsg->thread_wqh);
1081 }
1082
1083
1084 static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1085 {
1086 unsigned long flags;
1087 struct task_struct *thread_task;
1088
1089 /* Do nothing if a higher-priority exception is already in progress.
1090 * If a lower-or-equal priority exception is in progress, preempt it
1091 * and notify the main thread by sending it a signal. */
1092 spin_lock_irqsave(&fsg->lock, flags);
1093 if (fsg->state <= new_state) {
1094 fsg->exception_req_tag = fsg->ep0_req_tag;
1095 fsg->state = new_state;
1096 thread_task = fsg->thread_task;
1097 if (thread_task)
1098 send_sig_info(SIGUSR1, SEND_SIG_FORCED, thread_task);
1099 }
1100 spin_unlock_irqrestore(&fsg->lock, flags);
1101 }
1102
1103
1104 /*-------------------------------------------------------------------------*/
1105
1106 /* The disconnect callback and ep0 routines. These always run in_irq,
1107 * except that ep0_queue() is called in the main thread to acknowledge
1108 * completion of various requests: set config, set interface, and
1109 * Bulk-only device reset. */
1110
1111 static void fsg_disconnect(struct usb_gadget *gadget)
1112 {
1113 struct fsg_dev *fsg = get_gadget_data(gadget);
1114
1115 DBG(fsg, "disconnect or port reset\n");
1116 raise_exception(fsg, FSG_STATE_DISCONNECT);
1117 }
1118
1119
1120 static int ep0_queue(struct fsg_dev *fsg)
1121 {
1122 int rc;
1123
1124 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1125 if (rc != 0 && rc != -ESHUTDOWN) {
1126
1127 /* We can't do much more than wait for a reset */
1128 WARN(fsg, "error in submission: %s --> %d\n",
1129 fsg->ep0->name, rc);
1130 }
1131 return rc;
1132 }
1133
1134 static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1135 {
1136 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1137
1138 if (req->actual > 0)
1139 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1140 if (req->status || req->actual != req->length)
1141 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1142 req->status, req->actual, req->length);
1143 if (req->status == -ECONNRESET) // Request was cancelled
1144 usb_ep_fifo_flush(ep);
1145
1146 if (req->status == 0 && req->context)
1147 ((fsg_routine_t) (req->context))(fsg);
1148 }
1149
1150
1151 /*-------------------------------------------------------------------------*/
1152
1153 /* Bulk and interrupt endpoint completion handlers.
1154 * These always run in_irq. */
1155
1156 static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1157 {
1158 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1159 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1160
1161 if (req->status || req->actual != req->length)
1162 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1163 req->status, req->actual, req->length);
1164 if (req->status == -ECONNRESET) // Request was cancelled
1165 usb_ep_fifo_flush(ep);
1166
1167 /* Hold the lock while we update the request and buffer states */
1168 spin_lock(&fsg->lock);
1169 bh->inreq_busy = 0;
1170 bh->state = BUF_STATE_EMPTY;
1171 spin_unlock(&fsg->lock);
1172 wakeup_thread(fsg);
1173 }
1174
1175 static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1176 {
1177 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1178 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1179
1180 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1181 if (req->status || req->actual != bh->bulk_out_intended_length)
1182 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1183 req->status, req->actual,
1184 bh->bulk_out_intended_length);
1185 if (req->status == -ECONNRESET) // Request was cancelled
1186 usb_ep_fifo_flush(ep);
1187
1188 /* Hold the lock while we update the request and buffer states */
1189 spin_lock(&fsg->lock);
1190 bh->outreq_busy = 0;
1191 bh->state = BUF_STATE_FULL;
1192 spin_unlock(&fsg->lock);
1193 wakeup_thread(fsg);
1194 }
1195
1196
1197 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1198 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1199 {
1200 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1201 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1202
1203 if (req->status || req->actual != req->length)
1204 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1205 req->status, req->actual, req->length);
1206 if (req->status == -ECONNRESET) // Request was cancelled
1207 usb_ep_fifo_flush(ep);
1208
1209 /* Hold the lock while we update the request and buffer states */
1210 spin_lock(&fsg->lock);
1211 fsg->intreq_busy = 0;
1212 bh->state = BUF_STATE_EMPTY;
1213 spin_unlock(&fsg->lock);
1214 wakeup_thread(fsg);
1215 }
1216
1217 #else
1218 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1219 {}
1220 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1221
1222
1223 /*-------------------------------------------------------------------------*/
1224
1225 /* Ep0 class-specific handlers. These always run in_irq. */
1226
1227 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1228 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1229 {
1230 struct usb_request *req = fsg->ep0req;
1231 static u8 cbi_reset_cmnd[6] = {
1232 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1233
1234 /* Error in command transfer? */
1235 if (req->status || req->length != req->actual ||
1236 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1237
1238 /* Not all controllers allow a protocol stall after
1239 * receiving control-out data, but we'll try anyway. */
1240 fsg_set_halt(fsg, fsg->ep0);
1241 return; // Wait for reset
1242 }
1243
1244 /* Is it the special reset command? */
1245 if (req->actual >= sizeof cbi_reset_cmnd &&
1246 memcmp(req->buf, cbi_reset_cmnd,
1247 sizeof cbi_reset_cmnd) == 0) {
1248
1249 /* Raise an exception to stop the current operation
1250 * and reinitialize our state. */
1251 DBG(fsg, "cbi reset request\n");
1252 raise_exception(fsg, FSG_STATE_RESET);
1253 return;
1254 }
1255
1256 VDBG(fsg, "CB[I] accept device-specific command\n");
1257 spin_lock(&fsg->lock);
1258
1259 /* Save the command for later */
1260 if (fsg->cbbuf_cmnd_size)
1261 WARN(fsg, "CB[I] overwriting previous command\n");
1262 fsg->cbbuf_cmnd_size = req->actual;
1263 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1264
1265 spin_unlock(&fsg->lock);
1266 wakeup_thread(fsg);
1267 }
1268
1269 #else
1270 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1271 {}
1272 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1273
1274
1275 static int class_setup_req(struct fsg_dev *fsg,
1276 const struct usb_ctrlrequest *ctrl)
1277 {
1278 struct usb_request *req = fsg->ep0req;
1279 int value = -EOPNOTSUPP;
1280 u16 w_index = le16_to_cpu(ctrl->wIndex);
1281 u16 w_length = le16_to_cpu(ctrl->wLength);
1282
1283 if (!fsg->config)
1284 return value;
1285
1286 /* Handle Bulk-only class-specific requests */
1287 if (transport_is_bbb()) {
1288 switch (ctrl->bRequest) {
1289
1290 case USB_BULK_RESET_REQUEST:
1291 if (ctrl->bRequestType != (USB_DIR_OUT |
1292 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1293 break;
1294 if (w_index != 0) {
1295 value = -EDOM;
1296 break;
1297 }
1298
1299 /* Raise an exception to stop the current operation
1300 * and reinitialize our state. */
1301 DBG(fsg, "bulk reset request\n");
1302 raise_exception(fsg, FSG_STATE_RESET);
1303 value = DELAYED_STATUS;
1304 break;
1305
1306 case USB_BULK_GET_MAX_LUN_REQUEST:
1307 if (ctrl->bRequestType != (USB_DIR_IN |
1308 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1309 break;
1310 if (w_index != 0) {
1311 value = -EDOM;
1312 break;
1313 }
1314 VDBG(fsg, "get max LUN\n");
1315 *(u8 *) req->buf = fsg->nluns - 1;
1316 value = 1;
1317 break;
1318 }
1319 }
1320
1321 /* Handle CBI class-specific requests */
1322 else {
1323 switch (ctrl->bRequest) {
1324
1325 case USB_CBI_ADSC_REQUEST:
1326 if (ctrl->bRequestType != (USB_DIR_OUT |
1327 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1328 break;
1329 if (w_index != 0) {
1330 value = -EDOM;
1331 break;
1332 }
1333 if (w_length > MAX_COMMAND_SIZE) {
1334 value = -EOVERFLOW;
1335 break;
1336 }
1337 value = w_length;
1338 fsg->ep0req->context = received_cbi_adsc;
1339 break;
1340 }
1341 }
1342
1343 if (value == -EOPNOTSUPP)
1344 VDBG(fsg,
1345 "unknown class-specific control req "
1346 "%02x.%02x v%04x i%04x l%u\n",
1347 ctrl->bRequestType, ctrl->bRequest,
1348 le16_to_cpu(ctrl->wValue), w_index, w_length);
1349 return value;
1350 }
1351
1352
1353 /*-------------------------------------------------------------------------*/
1354
1355 /* Ep0 standard request handlers. These always run in_irq. */
1356
1357 static int standard_setup_req(struct fsg_dev *fsg,
1358 const struct usb_ctrlrequest *ctrl)
1359 {
1360 struct usb_request *req = fsg->ep0req;
1361 int value = -EOPNOTSUPP;
1362 u16 w_index = le16_to_cpu(ctrl->wIndex);
1363 u16 w_value = le16_to_cpu(ctrl->wValue);
1364
1365 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1366 * but config change events will also reconfigure hardware. */
1367 switch (ctrl->bRequest) {
1368
1369 case USB_REQ_GET_DESCRIPTOR:
1370 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1371 USB_RECIP_DEVICE))
1372 break;
1373 switch (w_value >> 8) {
1374
1375 case USB_DT_DEVICE:
1376 VDBG(fsg, "get device descriptor\n");
1377 value = sizeof device_desc;
1378 memcpy(req->buf, &device_desc, value);
1379 break;
1380 #ifdef CONFIG_USB_GADGET_DUALSPEED
1381 case USB_DT_DEVICE_QUALIFIER:
1382 VDBG(fsg, "get device qualifier\n");
1383 if (!fsg->gadget->is_dualspeed)
1384 break;
1385 value = sizeof dev_qualifier;
1386 memcpy(req->buf, &dev_qualifier, value);
1387 break;
1388
1389 case USB_DT_OTHER_SPEED_CONFIG:
1390 VDBG(fsg, "get other-speed config descriptor\n");
1391 if (!fsg->gadget->is_dualspeed)
1392 break;
1393 goto get_config;
1394 #endif
1395 case USB_DT_CONFIG:
1396 VDBG(fsg, "get configuration descriptor\n");
1397 #ifdef CONFIG_USB_GADGET_DUALSPEED
1398 get_config:
1399 #endif
1400 value = populate_config_buf(fsg->gadget,
1401 req->buf,
1402 w_value >> 8,
1403 w_value & 0xff);
1404 break;
1405
1406 case USB_DT_STRING:
1407 VDBG(fsg, "get string descriptor\n");
1408
1409 /* wIndex == language code */
1410 value = usb_gadget_get_string(&stringtab,
1411 w_value & 0xff, req->buf);
1412 break;
1413 }
1414 break;
1415
1416 /* One config, two speeds */
1417 case USB_REQ_SET_CONFIGURATION:
1418 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1419 USB_RECIP_DEVICE))
1420 break;
1421 VDBG(fsg, "set configuration\n");
1422 if (w_value == CONFIG_VALUE || w_value == 0) {
1423 fsg->new_config = w_value;
1424
1425 /* Raise an exception to wipe out previous transaction
1426 * state (queued bufs, etc) and set the new config. */
1427 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1428 value = DELAYED_STATUS;
1429 }
1430 break;
1431 case USB_REQ_GET_CONFIGURATION:
1432 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1433 USB_RECIP_DEVICE))
1434 break;
1435 VDBG(fsg, "get configuration\n");
1436 *(u8 *) req->buf = fsg->config;
1437 value = 1;
1438 break;
1439
1440 case USB_REQ_SET_INTERFACE:
1441 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1442 USB_RECIP_INTERFACE))
1443 break;
1444 if (fsg->config && w_index == 0) {
1445
1446 /* Raise an exception to wipe out previous transaction
1447 * state (queued bufs, etc) and install the new
1448 * interface altsetting. */
1449 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1450 value = DELAYED_STATUS;
1451 }
1452 break;
1453 case USB_REQ_GET_INTERFACE:
1454 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1455 USB_RECIP_INTERFACE))
1456 break;
1457 if (!fsg->config)
1458 break;
1459 if (w_index != 0) {
1460 value = -EDOM;
1461 break;
1462 }
1463 VDBG(fsg, "get interface\n");
1464 *(u8 *) req->buf = 0;
1465 value = 1;
1466 break;
1467
1468 default:
1469 VDBG(fsg,
1470 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1471 ctrl->bRequestType, ctrl->bRequest,
1472 w_value, w_index, le16_to_cpu(ctrl->wLength));
1473 }
1474
1475 return value;
1476 }
1477
1478
1479 static int fsg_setup(struct usb_gadget *gadget,
1480 const struct usb_ctrlrequest *ctrl)
1481 {
1482 struct fsg_dev *fsg = get_gadget_data(gadget);
1483 int rc;
1484 int w_length = le16_to_cpu(ctrl->wLength);
1485
1486 ++fsg->ep0_req_tag; // Record arrival of a new request
1487 fsg->ep0req->context = NULL;
1488 fsg->ep0req->length = 0;
1489 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1490
1491 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1492 rc = class_setup_req(fsg, ctrl);
1493 else
1494 rc = standard_setup_req(fsg, ctrl);
1495
1496 /* Respond with data/status or defer until later? */
1497 if (rc >= 0 && rc != DELAYED_STATUS) {
1498 rc = min(rc, w_length);
1499 fsg->ep0req->length = rc;
1500 fsg->ep0req->zero = rc < w_length;
1501 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1502 "ep0-in" : "ep0-out");
1503 rc = ep0_queue(fsg);
1504 }
1505
1506 /* Device either stalls (rc < 0) or reports success */
1507 return rc;
1508 }
1509
1510
1511 /*-------------------------------------------------------------------------*/
1512
1513 /* All the following routines run in process context */
1514
1515
1516 /* Use this for bulk or interrupt transfers, not ep0 */
1517 static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1518 struct usb_request *req, volatile int *pbusy,
1519 volatile enum fsg_buffer_state *state)
1520 {
1521 int rc;
1522
1523 if (ep == fsg->bulk_in)
1524 dump_msg(fsg, "bulk-in", req->buf, req->length);
1525 else if (ep == fsg->intr_in)
1526 dump_msg(fsg, "intr-in", req->buf, req->length);
1527 *pbusy = 1;
1528 *state = BUF_STATE_BUSY;
1529 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1530 if (rc != 0) {
1531 *pbusy = 0;
1532 *state = BUF_STATE_EMPTY;
1533
1534 /* We can't do much more than wait for a reset */
1535
1536 /* Note: currently the net2280 driver fails zero-length
1537 * submissions if DMA is enabled. */
1538 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1539 req->length == 0))
1540 WARN(fsg, "error in submission: %s --> %d\n",
1541 ep->name, rc);
1542 }
1543 }
1544
1545
1546 static int sleep_thread(struct fsg_dev *fsg)
1547 {
1548 int rc;
1549
1550 /* Wait until a signal arrives or we are woken up */
1551 rc = wait_event_interruptible(fsg->thread_wqh,
1552 fsg->thread_wakeup_needed);
1553 fsg->thread_wakeup_needed = 0;
1554 try_to_freeze();
1555 return (rc ? -EINTR : 0);
1556 }
1557
1558
1559 /*-------------------------------------------------------------------------*/
1560
1561 static int do_read(struct fsg_dev *fsg)
1562 {
1563 struct lun *curlun = fsg->curlun;
1564 u32 lba;
1565 struct fsg_buffhd *bh;
1566 int rc;
1567 u32 amount_left;
1568 loff_t file_offset, file_offset_tmp;
1569 unsigned int amount;
1570 unsigned int partial_page;
1571 ssize_t nread;
1572
1573 /* Get the starting Logical Block Address and check that it's
1574 * not too big */
1575 if (fsg->cmnd[0] == SC_READ_6)
1576 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1577 else {
1578 lba = get_be32(&fsg->cmnd[2]);
1579
1580 /* We allow DPO (Disable Page Out = don't save data in the
1581 * cache) and FUA (Force Unit Access = don't read from the
1582 * cache), but we don't implement them. */
1583 if ((fsg->cmnd[1] & ~0x18) != 0) {
1584 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1585 return -EINVAL;
1586 }
1587 }
1588 if (lba >= curlun->num_sectors) {
1589 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1590 return -EINVAL;
1591 }
1592 file_offset = ((loff_t) lba) << 9;
1593
1594 /* Carry out the file reads */
1595 amount_left = fsg->data_size_from_cmnd;
1596 if (unlikely(amount_left == 0))
1597 return -EIO; // No default reply
1598
1599 for (;;) {
1600
1601 /* Figure out how much we need to read:
1602 * Try to read the remaining amount.
1603 * But don't read more than the buffer size.
1604 * And don't try to read past the end of the file.
1605 * Finally, if we're not at a page boundary, don't read past
1606 * the next page.
1607 * If this means reading 0 then we were asked to read past
1608 * the end of file. */
1609 amount = min((unsigned int) amount_left, mod_data.buflen);
1610 amount = min((loff_t) amount,
1611 curlun->file_length - file_offset);
1612 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1613 if (partial_page > 0)
1614 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1615 partial_page);
1616
1617 /* Wait for the next buffer to become available */
1618 bh = fsg->next_buffhd_to_fill;
1619 while (bh->state != BUF_STATE_EMPTY) {
1620 if ((rc = sleep_thread(fsg)) != 0)
1621 return rc;
1622 }
1623
1624 /* If we were asked to read past the end of file,
1625 * end with an empty buffer. */
1626 if (amount == 0) {
1627 curlun->sense_data =
1628 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1629 curlun->sense_data_info = file_offset >> 9;
1630 bh->inreq->length = 0;
1631 bh->state = BUF_STATE_FULL;
1632 break;
1633 }
1634
1635 /* Perform the read */
1636 file_offset_tmp = file_offset;
1637 nread = vfs_read(curlun->filp,
1638 (char __user *) bh->buf,
1639 amount, &file_offset_tmp);
1640 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1641 (unsigned long long) file_offset,
1642 (int) nread);
1643 if (signal_pending(current))
1644 return -EINTR;
1645
1646 if (nread < 0) {
1647 LDBG(curlun, "error in file read: %d\n",
1648 (int) nread);
1649 nread = 0;
1650 } else if (nread < amount) {
1651 LDBG(curlun, "partial file read: %d/%u\n",
1652 (int) nread, amount);
1653 nread -= (nread & 511); // Round down to a block
1654 }
1655 file_offset += nread;
1656 amount_left -= nread;
1657 fsg->residue -= nread;
1658 bh->inreq->length = nread;
1659 bh->state = BUF_STATE_FULL;
1660
1661 /* If an error occurred, report it and its position */
1662 if (nread < amount) {
1663 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1664 curlun->sense_data_info = file_offset >> 9;
1665 break;
1666 }
1667
1668 if (amount_left == 0)
1669 break; // No more left to read
1670
1671 /* Send this buffer and go read some more */
1672 bh->inreq->zero = 0;
1673 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1674 &bh->inreq_busy, &bh->state);
1675 fsg->next_buffhd_to_fill = bh->next;
1676 }
1677
1678 return -EIO; // No default reply
1679 }
1680
1681
1682 /*-------------------------------------------------------------------------*/
1683
1684 static int do_write(struct fsg_dev *fsg)
1685 {
1686 struct lun *curlun = fsg->curlun;
1687 u32 lba;
1688 struct fsg_buffhd *bh;
1689 int get_some_more;
1690 u32 amount_left_to_req, amount_left_to_write;
1691 loff_t usb_offset, file_offset, file_offset_tmp;
1692 unsigned int amount;
1693 unsigned int partial_page;
1694 ssize_t nwritten;
1695 int rc;
1696
1697 if (curlun->ro) {
1698 curlun->sense_data = SS_WRITE_PROTECTED;
1699 return -EINVAL;
1700 }
1701 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1702
1703 /* Get the starting Logical Block Address and check that it's
1704 * not too big */
1705 if (fsg->cmnd[0] == SC_WRITE_6)
1706 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1707 else {
1708 lba = get_be32(&fsg->cmnd[2]);
1709
1710 /* We allow DPO (Disable Page Out = don't save data in the
1711 * cache) and FUA (Force Unit Access = write directly to the
1712 * medium). We don't implement DPO; we implement FUA by
1713 * performing synchronous output. */
1714 if ((fsg->cmnd[1] & ~0x18) != 0) {
1715 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1716 return -EINVAL;
1717 }
1718 if (fsg->cmnd[1] & 0x08) // FUA
1719 curlun->filp->f_flags |= O_SYNC;
1720 }
1721 if (lba >= curlun->num_sectors) {
1722 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1723 return -EINVAL;
1724 }
1725
1726 /* Carry out the file writes */
1727 get_some_more = 1;
1728 file_offset = usb_offset = ((loff_t) lba) << 9;
1729 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1730
1731 while (amount_left_to_write > 0) {
1732
1733 /* Queue a request for more data from the host */
1734 bh = fsg->next_buffhd_to_fill;
1735 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1736
1737 /* Figure out how much we want to get:
1738 * Try to get the remaining amount.
1739 * But don't get more than the buffer size.
1740 * And don't try to go past the end of the file.
1741 * If we're not at a page boundary,
1742 * don't go past the next page.
1743 * If this means getting 0, then we were asked
1744 * to write past the end of file.
1745 * Finally, round down to a block boundary. */
1746 amount = min(amount_left_to_req, mod_data.buflen);
1747 amount = min((loff_t) amount, curlun->file_length -
1748 usb_offset);
1749 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1750 if (partial_page > 0)
1751 amount = min(amount,
1752 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1753
1754 if (amount == 0) {
1755 get_some_more = 0;
1756 curlun->sense_data =
1757 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1758 curlun->sense_data_info = usb_offset >> 9;
1759 continue;
1760 }
1761 amount -= (amount & 511);
1762 if (amount == 0) {
1763
1764 /* Why were we were asked to transfer a
1765 * partial block? */
1766 get_some_more = 0;
1767 continue;
1768 }
1769
1770 /* Get the next buffer */
1771 usb_offset += amount;
1772 fsg->usb_amount_left -= amount;
1773 amount_left_to_req -= amount;
1774 if (amount_left_to_req == 0)
1775 get_some_more = 0;
1776
1777 /* amount is always divisible by 512, hence by
1778 * the bulk-out maxpacket size */
1779 bh->outreq->length = bh->bulk_out_intended_length =
1780 amount;
1781 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1782 &bh->outreq_busy, &bh->state);
1783 fsg->next_buffhd_to_fill = bh->next;
1784 continue;
1785 }
1786
1787 /* Write the received data to the backing file */
1788 bh = fsg->next_buffhd_to_drain;
1789 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1790 break; // We stopped early
1791 if (bh->state == BUF_STATE_FULL) {
1792 fsg->next_buffhd_to_drain = bh->next;
1793 bh->state = BUF_STATE_EMPTY;
1794
1795 /* Did something go wrong with the transfer? */
1796 if (bh->outreq->status != 0) {
1797 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1798 curlun->sense_data_info = file_offset >> 9;
1799 break;
1800 }
1801
1802 amount = bh->outreq->actual;
1803 if (curlun->file_length - file_offset < amount) {
1804 LERROR(curlun,
1805 "write %u @ %llu beyond end %llu\n",
1806 amount, (unsigned long long) file_offset,
1807 (unsigned long long) curlun->file_length);
1808 amount = curlun->file_length - file_offset;
1809 }
1810
1811 /* Perform the write */
1812 file_offset_tmp = file_offset;
1813 nwritten = vfs_write(curlun->filp,
1814 (char __user *) bh->buf,
1815 amount, &file_offset_tmp);
1816 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1817 (unsigned long long) file_offset,
1818 (int) nwritten);
1819 if (signal_pending(current))
1820 return -EINTR; // Interrupted!
1821
1822 if (nwritten < 0) {
1823 LDBG(curlun, "error in file write: %d\n",
1824 (int) nwritten);
1825 nwritten = 0;
1826 } else if (nwritten < amount) {
1827 LDBG(curlun, "partial file write: %d/%u\n",
1828 (int) nwritten, amount);
1829 nwritten -= (nwritten & 511);
1830 // Round down to a block
1831 }
1832 file_offset += nwritten;
1833 amount_left_to_write -= nwritten;
1834 fsg->residue -= nwritten;
1835
1836 /* If an error occurred, report it and its position */
1837 if (nwritten < amount) {
1838 curlun->sense_data = SS_WRITE_ERROR;
1839 curlun->sense_data_info = file_offset >> 9;
1840 break;
1841 }
1842
1843 /* Did the host decide to stop early? */
1844 if (bh->outreq->actual != bh->outreq->length) {
1845 fsg->short_packet_received = 1;
1846 break;
1847 }
1848 continue;
1849 }
1850
1851 /* Wait for something to happen */
1852 if ((rc = sleep_thread(fsg)) != 0)
1853 return rc;
1854 }
1855
1856 return -EIO; // No default reply
1857 }
1858
1859
1860 /*-------------------------------------------------------------------------*/
1861
1862 /* Sync the file data, don't bother with the metadata.
1863 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1864 static int fsync_sub(struct lun *curlun)
1865 {
1866 struct file *filp = curlun->filp;
1867 struct inode *inode;
1868 int rc, err;
1869
1870 if (curlun->ro || !filp)
1871 return 0;
1872 if (!filp->f_op->fsync)
1873 return -EINVAL;
1874
1875 inode = filp->f_dentry->d_inode;
1876 down(&inode->i_sem);
1877 current->flags |= PF_SYNCWRITE;
1878 rc = filemap_fdatawrite(inode->i_mapping);
1879 err = filp->f_op->fsync(filp, filp->f_dentry, 1);
1880 if (!rc)
1881 rc = err;
1882 err = filemap_fdatawait(inode->i_mapping);
1883 if (!rc)
1884 rc = err;
1885 current->flags &= ~PF_SYNCWRITE;
1886 up(&inode->i_sem);
1887 VLDBG(curlun, "fdatasync -> %d\n", rc);
1888 return rc;
1889 }
1890
1891 static void fsync_all(struct fsg_dev *fsg)
1892 {
1893 int i;
1894
1895 for (i = 0; i < fsg->nluns; ++i)
1896 fsync_sub(&fsg->luns[i]);
1897 }
1898
1899 static int do_synchronize_cache(struct fsg_dev *fsg)
1900 {
1901 struct lun *curlun = fsg->curlun;
1902 int rc;
1903
1904 /* We ignore the requested LBA and write out all file's
1905 * dirty data buffers. */
1906 rc = fsync_sub(curlun);
1907 if (rc)
1908 curlun->sense_data = SS_WRITE_ERROR;
1909 return 0;
1910 }
1911
1912
1913 /*-------------------------------------------------------------------------*/
1914
1915 static void invalidate_sub(struct lun *curlun)
1916 {
1917 struct file *filp = curlun->filp;
1918 struct inode *inode = filp->f_dentry->d_inode;
1919 unsigned long rc;
1920
1921 rc = invalidate_inode_pages(inode->i_mapping);
1922 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1923 }
1924
1925 static int do_verify(struct fsg_dev *fsg)
1926 {
1927 struct lun *curlun = fsg->curlun;
1928 u32 lba;
1929 u32 verification_length;
1930 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1931 loff_t file_offset, file_offset_tmp;
1932 u32 amount_left;
1933 unsigned int amount;
1934 ssize_t nread;
1935
1936 /* Get the starting Logical Block Address and check that it's
1937 * not too big */
1938 lba = get_be32(&fsg->cmnd[2]);
1939 if (lba >= curlun->num_sectors) {
1940 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1941 return -EINVAL;
1942 }
1943
1944 /* We allow DPO (Disable Page Out = don't save data in the
1945 * cache) but we don't implement it. */
1946 if ((fsg->cmnd[1] & ~0x10) != 0) {
1947 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1948 return -EINVAL;
1949 }
1950
1951 verification_length = get_be16(&fsg->cmnd[7]);
1952 if (unlikely(verification_length == 0))
1953 return -EIO; // No default reply
1954
1955 /* Prepare to carry out the file verify */
1956 amount_left = verification_length << 9;
1957 file_offset = ((loff_t) lba) << 9;
1958
1959 /* Write out all the dirty buffers before invalidating them */
1960 fsync_sub(curlun);
1961 if (signal_pending(current))
1962 return -EINTR;
1963
1964 invalidate_sub(curlun);
1965 if (signal_pending(current))
1966 return -EINTR;
1967
1968 /* Just try to read the requested blocks */
1969 while (amount_left > 0) {
1970
1971 /* Figure out how much we need to read:
1972 * Try to read the remaining amount, but not more than
1973 * the buffer size.
1974 * And don't try to read past the end of the file.
1975 * If this means reading 0 then we were asked to read
1976 * past the end of file. */
1977 amount = min((unsigned int) amount_left, mod_data.buflen);
1978 amount = min((loff_t) amount,
1979 curlun->file_length - file_offset);
1980 if (amount == 0) {
1981 curlun->sense_data =
1982 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1983 curlun->sense_data_info = file_offset >> 9;
1984 break;
1985 }
1986
1987 /* Perform the read */
1988 file_offset_tmp = file_offset;
1989 nread = vfs_read(curlun->filp,
1990 (char __user *) bh->buf,
1991 amount, &file_offset_tmp);
1992 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1993 (unsigned long long) file_offset,
1994 (int) nread);
1995 if (signal_pending(current))
1996 return -EINTR;
1997
1998 if (nread < 0) {
1999 LDBG(curlun, "error in file verify: %d\n",
2000 (int) nread);
2001 nread = 0;
2002 } else if (nread < amount) {
2003 LDBG(curlun, "partial file verify: %d/%u\n",
2004 (int) nread, amount);
2005 nread -= (nread & 511); // Round down to a sector
2006 }
2007 if (nread == 0) {
2008 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2009 curlun->sense_data_info = file_offset >> 9;
2010 break;
2011 }
2012 file_offset += nread;
2013 amount_left -= nread;
2014 }
2015 return 0;
2016 }
2017
2018
2019 /*-------------------------------------------------------------------------*/
2020
2021 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2022 {
2023 u8 *buf = (u8 *) bh->buf;
2024
2025 static char vendor_id[] = "Linux ";
2026 static char product_id[] = "File-Stor Gadget";
2027
2028 if (!fsg->curlun) { // Unsupported LUNs are okay
2029 fsg->bad_lun_okay = 1;
2030 memset(buf, 0, 36);
2031 buf[0] = 0x7f; // Unsupported, no device-type
2032 return 36;
2033 }
2034
2035 memset(buf, 0, 8); // Non-removable, direct-access device
2036 if (mod_data.removable)
2037 buf[1] = 0x80;
2038 buf[2] = 2; // ANSI SCSI level 2
2039 buf[3] = 2; // SCSI-2 INQUIRY data format
2040 buf[4] = 31; // Additional length
2041 // No special options
2042 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2043 mod_data.release);
2044 return 36;
2045 }
2046
2047
2048 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2049 {
2050 struct lun *curlun = fsg->curlun;
2051 u8 *buf = (u8 *) bh->buf;
2052 u32 sd, sdinfo;
2053
2054 /*
2055 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2056 *
2057 * If a REQUEST SENSE command is received from an initiator
2058 * with a pending unit attention condition (before the target
2059 * generates the contingent allegiance condition), then the
2060 * target shall either:
2061 * a) report any pending sense data and preserve the unit
2062 * attention condition on the logical unit, or,
2063 * b) report the unit attention condition, may discard any
2064 * pending sense data, and clear the unit attention
2065 * condition on the logical unit for that initiator.
2066 *
2067 * FSG normally uses option a); enable this code to use option b).
2068 */
2069 #if 0
2070 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2071 curlun->sense_data = curlun->unit_attention_data;
2072 curlun->unit_attention_data = SS_NO_SENSE;
2073 }
2074 #endif
2075
2076 if (!curlun) { // Unsupported LUNs are okay
2077 fsg->bad_lun_okay = 1;
2078 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2079 sdinfo = 0;
2080 } else {
2081 sd = curlun->sense_data;
2082 sdinfo = curlun->sense_data_info;
2083 curlun->sense_data = SS_NO_SENSE;
2084 curlun->sense_data_info = 0;
2085 }
2086
2087 memset(buf, 0, 18);
2088 buf[0] = 0x80 | 0x70; // Valid, current error
2089 buf[2] = SK(sd);
2090 put_be32(&buf[3], sdinfo); // Sense information
2091 buf[7] = 18 - 8; // Additional sense length
2092 buf[12] = ASC(sd);
2093 buf[13] = ASCQ(sd);
2094 return 18;
2095 }
2096
2097
2098 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2099 {
2100 struct lun *curlun = fsg->curlun;
2101 u32 lba = get_be32(&fsg->cmnd[2]);
2102 int pmi = fsg->cmnd[8];
2103 u8 *buf = (u8 *) bh->buf;
2104
2105 /* Check the PMI and LBA fields */
2106 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2107 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2108 return -EINVAL;
2109 }
2110
2111 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2112 put_be32(&buf[4], 512); // Block length
2113 return 8;
2114 }
2115
2116
2117 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2118 {
2119 struct lun *curlun = fsg->curlun;
2120 int mscmnd = fsg->cmnd[0];
2121 u8 *buf = (u8 *) bh->buf;
2122 u8 *buf0 = buf;
2123 int pc, page_code;
2124 int changeable_values, all_pages;
2125 int valid_page = 0;
2126 int len, limit;
2127
2128 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2129 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2130 return -EINVAL;
2131 }
2132 pc = fsg->cmnd[2] >> 6;
2133 page_code = fsg->cmnd[2] & 0x3f;
2134 if (pc == 3) {
2135 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2136 return -EINVAL;
2137 }
2138 changeable_values = (pc == 1);
2139 all_pages = (page_code == 0x3f);
2140
2141 /* Write the mode parameter header. Fixed values are: default
2142 * medium type, no cache control (DPOFUA), and no block descriptors.
2143 * The only variable value is the WriteProtect bit. We will fill in
2144 * the mode data length later. */
2145 memset(buf, 0, 8);
2146 if (mscmnd == SC_MODE_SENSE_6) {
2147 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2148 buf += 4;
2149 limit = 255;
2150 } else { // SC_MODE_SENSE_10
2151 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2152 buf += 8;
2153 limit = 65535; // Should really be mod_data.buflen
2154 }
2155
2156 /* No block descriptors */
2157
2158 /* The mode pages, in numerical order. The only page we support
2159 * is the Caching page. */
2160 if (page_code == 0x08 || all_pages) {
2161 valid_page = 1;
2162 buf[0] = 0x08; // Page code
2163 buf[1] = 10; // Page length
2164 memset(buf+2, 0, 10); // None of the fields are changeable
2165
2166 if (!changeable_values) {
2167 buf[2] = 0x04; // Write cache enable,
2168 // Read cache not disabled
2169 // No cache retention priorities
2170 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2171 // Minimum prefetch = 0
2172 put_be16(&buf[8], 0xffff); // Maximum prefetch
2173 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2174 }
2175 buf += 12;
2176 }
2177
2178 /* Check that a valid page was requested and the mode data length
2179 * isn't too long. */
2180 len = buf - buf0;
2181 if (!valid_page || len > limit) {
2182 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2183 return -EINVAL;
2184 }
2185
2186 /* Store the mode data length */
2187 if (mscmnd == SC_MODE_SENSE_6)
2188 buf0[0] = len - 1;
2189 else
2190 put_be16(buf0, len - 2);
2191 return len;
2192 }
2193
2194
2195 static int do_start_stop(struct fsg_dev *fsg)
2196 {
2197 struct lun *curlun = fsg->curlun;
2198 int loej, start;
2199
2200 if (!mod_data.removable) {
2201 curlun->sense_data = SS_INVALID_COMMAND;
2202 return -EINVAL;
2203 }
2204
2205 // int immed = fsg->cmnd[1] & 0x01;
2206 loej = fsg->cmnd[4] & 0x02;
2207 start = fsg->cmnd[4] & 0x01;
2208
2209 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2210 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2211 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2212 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2213 return -EINVAL;
2214 }
2215
2216 if (!start) {
2217
2218 /* Are we allowed to unload the media? */
2219 if (curlun->prevent_medium_removal) {
2220 LDBG(curlun, "unload attempt prevented\n");
2221 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2222 return -EINVAL;
2223 }
2224 if (loej) { // Simulate an unload/eject
2225 up_read(&fsg->filesem);
2226 down_write(&fsg->filesem);
2227 close_backing_file(curlun);
2228 up_write(&fsg->filesem);
2229 down_read(&fsg->filesem);
2230 }
2231 } else {
2232
2233 /* Our emulation doesn't support mounting; the medium is
2234 * available for use as soon as it is loaded. */
2235 if (!backing_file_is_open(curlun)) {
2236 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2237 return -EINVAL;
2238 }
2239 }
2240 #endif
2241 return 0;
2242 }
2243
2244
2245 static int do_prevent_allow(struct fsg_dev *fsg)
2246 {
2247 struct lun *curlun = fsg->curlun;
2248 int prevent;
2249
2250 if (!mod_data.removable) {
2251 curlun->sense_data = SS_INVALID_COMMAND;
2252 return -EINVAL;
2253 }
2254
2255 prevent = fsg->cmnd[4] & 0x01;
2256 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2257 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2258 return -EINVAL;
2259 }
2260
2261 if (curlun->prevent_medium_removal && !prevent)
2262 fsync_sub(curlun);
2263 curlun->prevent_medium_removal = prevent;
2264 return 0;
2265 }
2266
2267
2268 static int do_read_format_capacities(struct fsg_dev *fsg,
2269 struct fsg_buffhd *bh)
2270 {
2271 struct lun *curlun = fsg->curlun;
2272 u8 *buf = (u8 *) bh->buf;
2273
2274 buf[0] = buf[1] = buf[2] = 0;
2275 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2276 buf += 4;
2277
2278 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2279 put_be32(&buf[4], 512); // Block length
2280 buf[4] = 0x02; // Current capacity
2281 return 12;
2282 }
2283
2284
2285 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2286 {
2287 struct lun *curlun = fsg->curlun;
2288
2289 /* We don't support MODE SELECT */
2290 curlun->sense_data = SS_INVALID_COMMAND;
2291 return -EINVAL;
2292 }
2293
2294
2295 /*-------------------------------------------------------------------------*/
2296
2297 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2298 {
2299 int rc;
2300
2301 rc = fsg_set_halt(fsg, fsg->bulk_in);
2302 if (rc == -EAGAIN)
2303 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2304 while (rc != 0) {
2305 if (rc != -EAGAIN) {
2306 WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
2307 rc = 0;
2308 break;
2309 }
2310
2311 /* Wait for a short time and then try again */
2312 if (msleep_interruptible(100) != 0)
2313 return -EINTR;
2314 rc = usb_ep_set_halt(fsg->bulk_in);
2315 }
2316 return rc;
2317 }
2318
2319 static int pad_with_zeros(struct fsg_dev *fsg)
2320 {
2321 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2322 u32 nkeep = bh->inreq->length;
2323 u32 nsend;
2324 int rc;
2325
2326 bh->state = BUF_STATE_EMPTY; // For the first iteration
2327 fsg->usb_amount_left = nkeep + fsg->residue;
2328 while (fsg->usb_amount_left > 0) {
2329
2330 /* Wait for the next buffer to be free */
2331 while (bh->state != BUF_STATE_EMPTY) {
2332 if ((rc = sleep_thread(fsg)) != 0)
2333 return rc;
2334 }
2335
2336 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2337 memset(bh->buf + nkeep, 0, nsend - nkeep);
2338 bh->inreq->length = nsend;
2339 bh->inreq->zero = 0;
2340 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2341 &bh->inreq_busy, &bh->state);
2342 bh = fsg->next_buffhd_to_fill = bh->next;
2343 fsg->usb_amount_left -= nsend;
2344 nkeep = 0;
2345 }
2346 return 0;
2347 }
2348
2349 static int throw_away_data(struct fsg_dev *fsg)
2350 {
2351 struct fsg_buffhd *bh;
2352 u32 amount;
2353 int rc;
2354
2355 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2356 fsg->usb_amount_left > 0) {
2357
2358 /* Throw away the data in a filled buffer */
2359 if (bh->state == BUF_STATE_FULL) {
2360 bh->state = BUF_STATE_EMPTY;
2361 fsg->next_buffhd_to_drain = bh->next;
2362
2363 /* A short packet or an error ends everything */
2364 if (bh->outreq->actual != bh->outreq->length ||
2365 bh->outreq->status != 0) {
2366 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2367 return -EINTR;
2368 }
2369 continue;
2370 }
2371
2372 /* Try to submit another request if we need one */
2373 bh = fsg->next_buffhd_to_fill;
2374 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2375 amount = min(fsg->usb_amount_left,
2376 (u32) mod_data.buflen);
2377
2378 /* amount is always divisible by 512, hence by
2379 * the bulk-out maxpacket size */
2380 bh->outreq->length = bh->bulk_out_intended_length =
2381 amount;
2382 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2383 &bh->outreq_busy, &bh->state);
2384 fsg->next_buffhd_to_fill = bh->next;
2385 fsg->usb_amount_left -= amount;
2386 continue;
2387 }
2388
2389 /* Otherwise wait for something to happen */
2390 if ((rc = sleep_thread(fsg)) != 0)
2391 return rc;
2392 }
2393 return 0;
2394 }
2395
2396
2397 static int finish_reply(struct fsg_dev *fsg)
2398 {
2399 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2400 int rc = 0;
2401
2402 switch (fsg->data_dir) {
2403 case DATA_DIR_NONE:
2404 break; // Nothing to send
2405
2406 /* If we don't know whether the host wants to read or write,
2407 * this must be CB or CBI with an unknown command. We mustn't
2408 * try to send or receive any data. So stall both bulk pipes
2409 * if we can and wait for a reset. */
2410 case DATA_DIR_UNKNOWN:
2411 if (mod_data.can_stall) {
2412 fsg_set_halt(fsg, fsg->bulk_out);
2413 rc = halt_bulk_in_endpoint(fsg);
2414 }
2415 break;
2416
2417 /* All but the last buffer of data must have already been sent */
2418 case DATA_DIR_TO_HOST:
2419 if (fsg->data_size == 0)
2420 ; // Nothing to send
2421
2422 /* If there's no residue, simply send the last buffer */
2423 else if (fsg->residue == 0) {
2424 bh->inreq->zero = 0;
2425 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2426 &bh->inreq_busy, &bh->state);
2427 fsg->next_buffhd_to_fill = bh->next;
2428 }
2429
2430 /* There is a residue. For CB and CBI, simply mark the end
2431 * of the data with a short packet. However, if we are
2432 * allowed to stall, there was no data at all (residue ==
2433 * data_size), and the command failed (invalid LUN or
2434 * sense data is set), then halt the bulk-in endpoint
2435 * instead. */
2436 else if (!transport_is_bbb()) {
2437 if (mod_data.can_stall &&
2438 fsg->residue == fsg->data_size &&
2439 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2440 bh->state = BUF_STATE_EMPTY;
2441 rc = halt_bulk_in_endpoint(fsg);
2442 } else {
2443 bh->inreq->zero = 1;
2444 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2445 &bh->inreq_busy, &bh->state);
2446 fsg->next_buffhd_to_fill = bh->next;
2447 }
2448 }
2449
2450 /* For Bulk-only, if we're allowed to stall then send the
2451 * short packet and halt the bulk-in endpoint. If we can't
2452 * stall, pad out the remaining data with 0's. */
2453 else {
2454 if (mod_data.can_stall) {
2455 bh->inreq->zero = 1;
2456 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2457 &bh->inreq_busy, &bh->state);
2458 fsg->next_buffhd_to_fill = bh->next;
2459 rc = halt_bulk_in_endpoint(fsg);
2460 } else
2461 rc = pad_with_zeros(fsg);
2462 }
2463 break;
2464
2465 /* We have processed all we want from the data the host has sent.
2466 * There may still be outstanding bulk-out requests. */
2467 case DATA_DIR_FROM_HOST:
2468 if (fsg->residue == 0)
2469 ; // Nothing to receive
2470
2471 /* Did the host stop sending unexpectedly early? */
2472 else if (fsg->short_packet_received) {
2473 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2474 rc = -EINTR;
2475 }
2476
2477 /* We haven't processed all the incoming data. Even though
2478 * we may be allowed to stall, doing so would cause a race.
2479 * The controller may already have ACK'ed all the remaining
2480 * bulk-out packets, in which case the host wouldn't see a
2481 * STALL. Not realizing the endpoint was halted, it wouldn't
2482 * clear the halt -- leading to problems later on. */
2483 #if 0
2484 else if (mod_data.can_stall) {
2485 fsg_set_halt(fsg, fsg->bulk_out);
2486 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2487 rc = -EINTR;
2488 }
2489 #endif
2490
2491 /* We can't stall. Read in the excess data and throw it
2492 * all away. */
2493 else
2494 rc = throw_away_data(fsg);
2495 break;
2496 }
2497 return rc;
2498 }
2499
2500
2501 static int send_status(struct fsg_dev *fsg)
2502 {
2503 struct lun *curlun = fsg->curlun;
2504 struct fsg_buffhd *bh;
2505 int rc;
2506 u8 status = USB_STATUS_PASS;
2507 u32 sd, sdinfo = 0;
2508
2509 /* Wait for the next buffer to become available */
2510 bh = fsg->next_buffhd_to_fill;
2511 while (bh->state != BUF_STATE_EMPTY) {
2512 if ((rc = sleep_thread(fsg)) != 0)
2513 return rc;
2514 }
2515
2516 if (curlun) {
2517 sd = curlun->sense_data;
2518 sdinfo = curlun->sense_data_info;
2519 } else if (fsg->bad_lun_okay)
2520 sd = SS_NO_SENSE;
2521 else
2522 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2523
2524 if (fsg->phase_error) {
2525 DBG(fsg, "sending phase-error status\n");
2526 status = USB_STATUS_PHASE_ERROR;
2527 sd = SS_INVALID_COMMAND;
2528 } else if (sd != SS_NO_SENSE) {
2529 DBG(fsg, "sending command-failure status\n");
2530 status = USB_STATUS_FAIL;
2531 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2532 " info x%x\n",
2533 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2534 }
2535
2536 if (transport_is_bbb()) {
2537 struct bulk_cs_wrap *csw = (struct bulk_cs_wrap *) bh->buf;
2538
2539 /* Store and send the Bulk-only CSW */
2540 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2541 csw->Tag = fsg->tag;
2542 csw->Residue = cpu_to_le32(fsg->residue);
2543 csw->Status = status;
2544
2545 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2546 bh->inreq->zero = 0;
2547 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2548 &bh->inreq_busy, &bh->state);
2549
2550 } else if (mod_data.transport_type == USB_PR_CB) {
2551
2552 /* Control-Bulk transport has no status phase! */
2553 return 0;
2554
2555 } else { // USB_PR_CBI
2556 struct interrupt_data *buf = (struct interrupt_data *)
2557 bh->buf;
2558
2559 /* Store and send the Interrupt data. UFI sends the ASC
2560 * and ASCQ bytes. Everything else sends a Type (which
2561 * is always 0) and the status Value. */
2562 if (mod_data.protocol_type == USB_SC_UFI) {
2563 buf->bType = ASC(sd);
2564 buf->bValue = ASCQ(sd);
2565 } else {
2566 buf->bType = 0;
2567 buf->bValue = status;
2568 }
2569 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2570
2571 fsg->intr_buffhd = bh; // Point to the right buffhd
2572 fsg->intreq->buf = bh->inreq->buf;
2573 fsg->intreq->dma = bh->inreq->dma;
2574 fsg->intreq->context = bh;
2575 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2576 &fsg->intreq_busy, &bh->state);
2577 }
2578
2579 fsg->next_buffhd_to_fill = bh->next;
2580 return 0;
2581 }
2582
2583
2584 /*-------------------------------------------------------------------------*/
2585
2586 /* Check whether the command is properly formed and whether its data size
2587 * and direction agree with the values we already have. */
2588 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2589 enum data_direction data_dir, unsigned int mask,
2590 int needs_medium, const char *name)
2591 {
2592 int i;
2593 int lun = fsg->cmnd[1] >> 5;
2594 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2595 char hdlen[20];
2596 struct lun *curlun;
2597
2598 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2599 * Transparent SCSI doesn't pad. */
2600 if (protocol_is_scsi())
2601 ;
2602
2603 /* There's some disagreement as to whether RBC pads commands or not.
2604 * We'll play it safe and accept either form. */
2605 else if (mod_data.protocol_type == USB_SC_RBC) {
2606 if (fsg->cmnd_size == 12)
2607 cmnd_size = 12;
2608
2609 /* All the other protocols pad to 12 bytes */
2610 } else
2611 cmnd_size = 12;
2612
2613 hdlen[0] = 0;
2614 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2615 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2616 fsg->data_size);
2617 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2618 name, cmnd_size, dirletter[(int) data_dir],
2619 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2620
2621 /* We can't reply at all until we know the correct data direction
2622 * and size. */
2623 if (fsg->data_size_from_cmnd == 0)
2624 data_dir = DATA_DIR_NONE;
2625 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2626 fsg->data_dir = data_dir;
2627 fsg->data_size = fsg->data_size_from_cmnd;
2628
2629 } else { // Bulk-only
2630 if (fsg->data_size < fsg->data_size_from_cmnd) {
2631
2632 /* Host data size < Device data size is a phase error.
2633 * Carry out the command, but only transfer as much
2634 * as we are allowed. */
2635 fsg->data_size_from_cmnd = fsg->data_size;
2636 fsg->phase_error = 1;
2637 }
2638 }
2639 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2640
2641 /* Conflicting data directions is a phase error */
2642 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2643 fsg->phase_error = 1;
2644 return -EINVAL;
2645 }
2646
2647 /* Verify the length of the command itself */
2648 if (cmnd_size != fsg->cmnd_size) {
2649
2650 /* Special case workaround: MS-Windows issues REQUEST SENSE
2651 * with cbw->Length == 12 (it should be 6). */
2652 if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2653 cmnd_size = fsg->cmnd_size;
2654 else {
2655 fsg->phase_error = 1;
2656 return -EINVAL;
2657 }
2658 }
2659
2660 /* Check that the LUN values are consistent */
2661 if (transport_is_bbb()) {
2662 if (fsg->lun != lun)
2663 DBG(fsg, "using LUN %d from CBW, "
2664 "not LUN %d from CDB\n",
2665 fsg->lun, lun);
2666 } else
2667 fsg->lun = lun; // Use LUN from the command
2668
2669 /* Check the LUN */
2670 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2671 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2672 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2673 curlun->sense_data = SS_NO_SENSE;
2674 curlun->sense_data_info = 0;
2675 }
2676 } else {
2677 fsg->curlun = curlun = NULL;
2678 fsg->bad_lun_okay = 0;
2679
2680 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2681 * to use unsupported LUNs; all others may not. */
2682 if (fsg->cmnd[0] != SC_INQUIRY &&
2683 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2684 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2685 return -EINVAL;
2686 }
2687 }
2688
2689 /* If a unit attention condition exists, only INQUIRY and
2690 * REQUEST SENSE commands are allowed; anything else must fail. */
2691 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2692 fsg->cmnd[0] != SC_INQUIRY &&
2693 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2694 curlun->sense_data = curlun->unit_attention_data;
2695 curlun->unit_attention_data = SS_NO_SENSE;
2696 return -EINVAL;
2697 }
2698
2699 /* Check that only command bytes listed in the mask are non-zero */
2700 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2701 for (i = 1; i < cmnd_size; ++i) {
2702 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2703 if (curlun)
2704 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2705 return -EINVAL;
2706 }
2707 }
2708
2709 /* If the medium isn't mounted and the command needs to access
2710 * it, return an error. */
2711 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2712 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2713 return -EINVAL;
2714 }
2715
2716 return 0;
2717 }
2718
2719
2720 static int do_scsi_command(struct fsg_dev *fsg)
2721 {
2722 struct fsg_buffhd *bh;
2723 int rc;
2724 int reply = -EINVAL;
2725 int i;
2726 static char unknown[16];
2727
2728 dump_cdb(fsg);
2729
2730 /* Wait for the next buffer to become available for data or status */
2731 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2732 while (bh->state != BUF_STATE_EMPTY) {
2733 if ((rc = sleep_thread(fsg)) != 0)
2734 return rc;
2735 }
2736 fsg->phase_error = 0;
2737 fsg->short_packet_received = 0;
2738
2739 down_read(&fsg->filesem); // We're using the backing file
2740 switch (fsg->cmnd[0]) {
2741
2742 case SC_INQUIRY:
2743 fsg->data_size_from_cmnd = fsg->cmnd[4];
2744 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2745 (1<<4), 0,
2746 "INQUIRY")) == 0)
2747 reply = do_inquiry(fsg, bh);
2748 break;
2749
2750 case SC_MODE_SELECT_6:
2751 fsg->data_size_from_cmnd = fsg->cmnd[4];
2752 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2753 (1<<1) | (1<<4), 0,
2754 "MODE SELECT(6)")) == 0)
2755 reply = do_mode_select(fsg, bh);
2756 break;
2757
2758 case SC_MODE_SELECT_10:
2759 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2760 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2761 (1<<1) | (3<<7), 0,
2762 "MODE SELECT(10)")) == 0)
2763 reply = do_mode_select(fsg, bh);
2764 break;
2765
2766 case SC_MODE_SENSE_6:
2767 fsg->data_size_from_cmnd = fsg->cmnd[4];
2768 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2769 (1<<1) | (1<<2) | (1<<4), 0,
2770 "MODE SENSE(6)")) == 0)
2771 reply = do_mode_sense(fsg, bh);
2772 break;
2773
2774 case SC_MODE_SENSE_10:
2775 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2776 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2777 (1<<1) | (1<<2) | (3<<7), 0,
2778 "MODE SENSE(10)")) == 0)
2779 reply = do_mode_sense(fsg, bh);
2780 break;
2781
2782 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2783 fsg->data_size_from_cmnd = 0;
2784 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2785 (1<<4), 0,
2786 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2787 reply = do_prevent_allow(fsg);
2788 break;
2789
2790 case SC_READ_6:
2791 i = fsg->cmnd[4];
2792 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2793 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2794 (7<<1) | (1<<4), 1,
2795 "READ(6)")) == 0)
2796 reply = do_read(fsg);
2797 break;
2798
2799 case SC_READ_10:
2800 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2801 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2802 (1<<1) | (0xf<<2) | (3<<7), 1,
2803 "READ(10)")) == 0)
2804 reply = do_read(fsg);
2805 break;
2806
2807 case SC_READ_12:
2808 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2809 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2810 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2811 "READ(12)")) == 0)
2812 reply = do_read(fsg);
2813 break;
2814
2815 case SC_READ_CAPACITY:
2816 fsg->data_size_from_cmnd = 8;
2817 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2818 (0xf<<2) | (1<<8), 1,
2819 "READ CAPACITY")) == 0)
2820 reply = do_read_capacity(fsg, bh);
2821 break;
2822
2823 case SC_READ_FORMAT_CAPACITIES:
2824 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2825 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2826 (3<<7), 1,
2827 "READ FORMAT CAPACITIES")) == 0)
2828 reply = do_read_format_capacities(fsg, bh);
2829 break;
2830
2831 case SC_REQUEST_SENSE:
2832 fsg->data_size_from_cmnd = fsg->cmnd[4];
2833 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2834 (1<<4), 0,
2835 "REQUEST SENSE")) == 0)
2836 reply = do_request_sense(fsg, bh);
2837 break;
2838
2839 case SC_START_STOP_UNIT:
2840 fsg->data_size_from_cmnd = 0;
2841 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2842 (1<<1) | (1<<4), 0,
2843 "START-STOP UNIT")) == 0)
2844 reply = do_start_stop(fsg);
2845 break;
2846
2847 case SC_SYNCHRONIZE_CACHE:
2848 fsg->data_size_from_cmnd = 0;
2849 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2850 (0xf<<2) | (3<<7), 1,
2851 "SYNCHRONIZE CACHE")) == 0)
2852 reply = do_synchronize_cache(fsg);
2853 break;
2854
2855 case SC_TEST_UNIT_READY:
2856 fsg->data_size_from_cmnd = 0;
2857 reply = check_command(fsg, 6, DATA_DIR_NONE,
2858 0, 1,
2859 "TEST UNIT READY");
2860 break;
2861
2862 /* Although optional, this command is used by MS-Windows. We
2863 * support a minimal version: BytChk must be 0. */
2864 case SC_VERIFY:
2865 fsg->data_size_from_cmnd = 0;
2866 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2867 (1<<1) | (0xf<<2) | (3<<7), 1,
2868 "VERIFY")) == 0)
2869 reply = do_verify(fsg);
2870 break;
2871
2872 case SC_WRITE_6:
2873 i = fsg->cmnd[4];
2874 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2875 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2876 (7<<1) | (1<<4), 1,
2877 "WRITE(6)")) == 0)
2878 reply = do_write(fsg);
2879 break;
2880
2881 case SC_WRITE_10:
2882 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2883 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2884 (1<<1) | (0xf<<2) | (3<<7), 1,
2885 "WRITE(10)")) == 0)
2886 reply = do_write(fsg);
2887 break;
2888
2889 case SC_WRITE_12:
2890 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2891 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2892 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2893 "WRITE(12)")) == 0)
2894 reply = do_write(fsg);
2895 break;
2896
2897 /* Some mandatory commands that we recognize but don't implement.
2898 * They don't mean much in this setting. It's left as an exercise
2899 * for anyone interested to implement RESERVE and RELEASE in terms
2900 * of Posix locks. */
2901 case SC_FORMAT_UNIT:
2902 case SC_RELEASE:
2903 case SC_RESERVE:
2904 case SC_SEND_DIAGNOSTIC:
2905 // Fall through
2906
2907 default:
2908 fsg->data_size_from_cmnd = 0;
2909 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2910 if ((reply = check_command(fsg, fsg->cmnd_size,
2911 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2912 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2913 reply = -EINVAL;
2914 }
2915 break;
2916 }
2917 up_read(&fsg->filesem);
2918
2919 if (reply == -EINTR || signal_pending(current))
2920 return -EINTR;
2921
2922 /* Set up the single reply buffer for finish_reply() */
2923 if (reply == -EINVAL)
2924 reply = 0; // Error reply length
2925 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2926 reply = min((u32) reply, fsg->data_size_from_cmnd);
2927 bh->inreq->length = reply;
2928 bh->state = BUF_STATE_FULL;
2929 fsg->residue -= reply;
2930 } // Otherwise it's already set
2931
2932 return 0;
2933 }
2934
2935
2936 /*-------------------------------------------------------------------------*/
2937
2938 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2939 {
2940 struct usb_request *req = bh->outreq;
2941 struct bulk_cb_wrap *cbw = (struct bulk_cb_wrap *) req->buf;
2942
2943 /* Was this a real packet? */
2944 if (req->status)
2945 return -EINVAL;
2946
2947 /* Is the CBW valid? */
2948 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2949 cbw->Signature != __constant_cpu_to_le32(
2950 USB_BULK_CB_SIG)) {
2951 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2952 req->actual,
2953 le32_to_cpu(cbw->Signature));
2954
2955 /* The Bulk-only spec says we MUST stall the bulk pipes!
2956 * If we want to avoid stalls, set a flag so that we will
2957 * clear the endpoint halts at the next reset. */
2958 if (!mod_data.can_stall)
2959 set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
2960 fsg_set_halt(fsg, fsg->bulk_out);
2961 halt_bulk_in_endpoint(fsg);
2962 return -EINVAL;
2963 }
2964
2965 /* Is the CBW meaningful? */
2966 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
2967 cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
2968 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
2969 "cmdlen %u\n",
2970 cbw->Lun, cbw->Flags, cbw->Length);
2971
2972 /* We can do anything we want here, so let's stall the
2973 * bulk pipes if we are allowed to. */
2974 if (mod_data.can_stall) {
2975 fsg_set_halt(fsg, fsg->bulk_out);
2976 halt_bulk_in_endpoint(fsg);
2977 }
2978 return -EINVAL;
2979 }
2980
2981 /* Save the command for later */
2982 fsg->cmnd_size = cbw->Length;
2983 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
2984 if (cbw->Flags & USB_BULK_IN_FLAG)
2985 fsg->data_dir = DATA_DIR_TO_HOST;
2986 else
2987 fsg->data_dir = DATA_DIR_FROM_HOST;
2988 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
2989 if (fsg->data_size == 0)
2990 fsg->data_dir = DATA_DIR_NONE;
2991 fsg->lun = cbw->Lun;
2992 fsg->tag = cbw->Tag;
2993 return 0;
2994 }
2995
2996
2997 static int get_next_command(struct fsg_dev *fsg)
2998 {
2999 struct fsg_buffhd *bh;
3000 int rc = 0;
3001
3002 if (transport_is_bbb()) {
3003
3004 /* Wait for the next buffer to become available */
3005 bh = fsg->next_buffhd_to_fill;
3006 while (bh->state != BUF_STATE_EMPTY) {
3007 if ((rc = sleep_thread(fsg)) != 0)
3008 return rc;
3009 }
3010
3011 /* Queue a request to read a Bulk-only CBW */
3012 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3013 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3014 &bh->outreq_busy, &bh->state);
3015
3016 /* We will drain the buffer in software, which means we
3017 * can reuse it for the next filling. No need to advance
3018 * next_buffhd_to_fill. */
3019
3020 /* Wait for the CBW to arrive */
3021 while (bh->state != BUF_STATE_FULL) {
3022 if ((rc = sleep_thread(fsg)) != 0)
3023 return rc;
3024 }
3025 rc = received_cbw(fsg, bh);
3026 bh->state = BUF_STATE_EMPTY;
3027
3028 } else { // USB_PR_CB or USB_PR_CBI
3029
3030 /* Wait for the next command to arrive */
3031 while (fsg->cbbuf_cmnd_size == 0) {
3032 if ((rc = sleep_thread(fsg)) != 0)
3033 return rc;
3034 }
3035
3036 /* Is the previous status interrupt request still busy?
3037 * The host is allowed to skip reading the status,
3038 * so we must cancel it. */
3039 if (fsg->intreq_busy)
3040 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3041
3042 /* Copy the command and mark the buffer empty */
3043 fsg->data_dir = DATA_DIR_UNKNOWN;
3044 spin_lock_irq(&fsg->lock);
3045 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3046 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3047 fsg->cbbuf_cmnd_size = 0;
3048 spin_unlock_irq(&fsg->lock);
3049 }
3050 return rc;
3051 }
3052
3053
3054 /*-------------------------------------------------------------------------*/
3055
3056 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3057 const struct usb_endpoint_descriptor *d)
3058 {
3059 int rc;
3060
3061 ep->driver_data = fsg;
3062 rc = usb_ep_enable(ep, d);
3063 if (rc)
3064 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3065 return rc;
3066 }
3067
3068 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3069 struct usb_request **preq)
3070 {
3071 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3072 if (*preq)
3073 return 0;
3074 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3075 return -ENOMEM;
3076 }
3077
3078 /*
3079 * Reset interface setting and re-init endpoint state (toggle etc).
3080 * Call with altsetting < 0 to disable the interface. The only other
3081 * available altsetting is 0, which enables the interface.
3082 */
3083 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3084 {
3085 int rc = 0;
3086 int i;
3087 const struct usb_endpoint_descriptor *d;
3088
3089 if (fsg->running)
3090 DBG(fsg, "reset interface\n");
3091
3092 reset:
3093 /* Deallocate the requests */
3094 for (i = 0; i < NUM_BUFFERS; ++i) {
3095 struct fsg_buffhd *bh = &fsg->buffhds[i];
3096
3097 if (bh->inreq) {
3098 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3099 bh->inreq = NULL;
3100 }
3101 if (bh->outreq) {
3102 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3103 bh->outreq = NULL;
3104 }
3105 }
3106 if (fsg->intreq) {
3107 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3108 fsg->intreq = NULL;
3109 }
3110
3111 /* Disable the endpoints */
3112 if (fsg->bulk_in_enabled) {
3113 usb_ep_disable(fsg->bulk_in);
3114 fsg->bulk_in_enabled = 0;
3115 }
3116 if (fsg->bulk_out_enabled) {
3117 usb_ep_disable(fsg->bulk_out);
3118 fsg->bulk_out_enabled = 0;
3119 }
3120 if (fsg->intr_in_enabled) {
3121 usb_ep_disable(fsg->intr_in);
3122 fsg->intr_in_enabled = 0;
3123 }
3124
3125 fsg->running = 0;
3126 if (altsetting < 0 || rc != 0)
3127 return rc;
3128
3129 DBG(fsg, "set interface %d\n", altsetting);
3130
3131 /* Enable the endpoints */
3132 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3133 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3134 goto reset;
3135 fsg->bulk_in_enabled = 1;
3136
3137 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3138 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3139 goto reset;
3140 fsg->bulk_out_enabled = 1;
3141 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3142
3143 if (transport_is_cbi()) {
3144 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3145 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3146 goto reset;
3147 fsg->intr_in_enabled = 1;
3148 }
3149
3150 /* Allocate the requests */
3151 for (i = 0; i < NUM_BUFFERS; ++i) {
3152 struct fsg_buffhd *bh = &fsg->buffhds[i];
3153
3154 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3155 goto reset;
3156 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3157 goto reset;
3158 bh->inreq->buf = bh->outreq->buf = bh->buf;
3159 bh->inreq->dma = bh->outreq->dma = bh->dma;
3160 bh->inreq->context = bh->outreq->context = bh;
3161 bh->inreq->complete = bulk_in_complete;
3162 bh->outreq->complete = bulk_out_complete;
3163 }
3164 if (transport_is_cbi()) {
3165 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3166 goto reset;
3167 fsg->intreq->complete = intr_in_complete;
3168 }
3169
3170 fsg->running = 1;
3171 for (i = 0; i < fsg->nluns; ++i)
3172 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3173 return rc;
3174 }
3175
3176
3177 /*
3178 * Change our operational configuration. This code must agree with the code
3179 * that returns config descriptors, and with interface altsetting code.
3180 *
3181 * It's also responsible for power management interactions. Some
3182 * configurations might not work with our current power sources.
3183 * For now we just assume the gadget is always self-powered.
3184 */
3185 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3186 {
3187 int rc = 0;
3188
3189 /* Disable the single interface */
3190 if (fsg->config != 0) {
3191 DBG(fsg, "reset config\n");
3192 fsg->config = 0;
3193 rc = do_set_interface(fsg, -1);
3194 }
3195
3196 /* Enable the interface */
3197 if (new_config != 0) {
3198 fsg->config = new_config;
3199 if ((rc = do_set_interface(fsg, 0)) != 0)
3200 fsg->config = 0; // Reset on errors
3201 else {
3202 char *speed;
3203
3204 switch (fsg->gadget->speed) {
3205 case USB_SPEED_LOW: speed = "low"; break;
3206 case USB_SPEED_FULL: speed = "full"; break;
3207 case USB_SPEED_HIGH: speed = "high"; break;
3208 default: speed = "?"; break;
3209 }
3210 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3211 }
3212 }
3213 return rc;
3214 }
3215
3216
3217 /*-------------------------------------------------------------------------*/
3218
3219 static void handle_exception(struct fsg_dev *fsg)
3220 {
3221 siginfo_t info;
3222 int sig;
3223 int i;
3224 int num_active;
3225 struct fsg_buffhd *bh;
3226 enum fsg_state old_state;
3227 u8 new_config;
3228 struct lun *curlun;
3229 unsigned int exception_req_tag;
3230 int rc;
3231
3232 /* Clear the existing signals. Anything but SIGUSR1 is converted
3233 * into a high-priority EXIT exception. */
3234 for (;;) {
3235 sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
3236 &info);
3237 if (!sig)
3238 break;
3239 if (sig != SIGUSR1) {
3240 if (fsg->state < FSG_STATE_EXIT)
3241 DBG(fsg, "Main thread exiting on signal\n");
3242 raise_exception(fsg, FSG_STATE_EXIT);
3243 }
3244 }
3245
3246 /* Cancel all the pending transfers */
3247 if (fsg->intreq_busy)
3248 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3249 for (i = 0; i < NUM_BUFFERS; ++i) {
3250 bh = &fsg->buffhds[i];
3251 if (bh->inreq_busy)
3252 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3253 if (bh->outreq_busy)
3254 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3255 }
3256
3257 /* Wait until everything is idle */
3258 for (;;) {
3259 num_active = fsg->intreq_busy;
3260 for (i = 0; i < NUM_BUFFERS; ++i) {
3261 bh = &fsg->buffhds[i];
3262 num_active += bh->inreq_busy + bh->outreq_busy;
3263 }
3264 if (num_active == 0)
3265 break;
3266 if (sleep_thread(fsg))
3267 return;
3268 }
3269
3270 /* Clear out the controller's fifos */
3271 if (fsg->bulk_in_enabled)
3272 usb_ep_fifo_flush(fsg->bulk_in);
3273 if (fsg->bulk_out_enabled)
3274 usb_ep_fifo_flush(fsg->bulk_out);
3275 if (fsg->intr_in_enabled)
3276 usb_ep_fifo_flush(fsg->intr_in);
3277
3278 /* Reset the I/O buffer states and pointers, the SCSI
3279 * state, and the exception. Then invoke the handler. */
3280 spin_lock_irq(&fsg->lock);
3281
3282 for (i = 0; i < NUM_BUFFERS; ++i) {
3283 bh = &fsg->buffhds[i];
3284 bh->state = BUF_STATE_EMPTY;
3285 }
3286 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3287 &fsg->buffhds[0];
3288
3289 exception_req_tag = fsg->exception_req_tag;
3290 new_config = fsg->new_config;
3291 old_state = fsg->state;
3292
3293 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3294 fsg->state = FSG_STATE_STATUS_PHASE;
3295 else {
3296 for (i = 0; i < fsg->nluns; ++i) {
3297 curlun = &fsg->luns[i];
3298 curlun->prevent_medium_removal = 0;
3299 curlun->sense_data = curlun->unit_attention_data =
3300 SS_NO_SENSE;
3301 curlun->sense_data_info = 0;
3302 }
3303 fsg->state = FSG_STATE_IDLE;
3304 }
3305 spin_unlock_irq(&fsg->lock);
3306
3307 /* Carry out any extra actions required for the exception */
3308 switch (old_state) {
3309 default:
3310 break;
3311
3312 case FSG_STATE_ABORT_BULK_OUT:
3313 send_status(fsg);
3314 spin_lock_irq(&fsg->lock);
3315 if (fsg->state == FSG_STATE_STATUS_PHASE)
3316 fsg->state = FSG_STATE_IDLE;
3317 spin_unlock_irq(&fsg->lock);
3318 break;
3319
3320 case FSG_STATE_RESET:
3321 /* In case we were forced against our will to halt a
3322 * bulk endpoint, clear the halt now. (The SuperH UDC
3323 * requires this.) */
3324 if (test_and_clear_bit(CLEAR_BULK_HALTS,
3325 &fsg->atomic_bitflags)) {
3326 usb_ep_clear_halt(fsg->bulk_in);
3327 usb_ep_clear_halt(fsg->bulk_out);
3328 }
3329
3330 if (transport_is_bbb()) {
3331 if (fsg->ep0_req_tag == exception_req_tag)
3332 ep0_queue(fsg); // Complete the status stage
3333
3334 } else if (transport_is_cbi())
3335 send_status(fsg); // Status by interrupt pipe
3336
3337 /* Technically this should go here, but it would only be
3338 * a waste of time. Ditto for the INTERFACE_CHANGE and
3339 * CONFIG_CHANGE cases. */
3340 // for (i = 0; i < fsg->nluns; ++i)
3341 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3342 break;
3343
3344 case FSG_STATE_INTERFACE_CHANGE:
3345 rc = do_set_interface(fsg, 0);
3346 if (fsg->ep0_req_tag != exception_req_tag)
3347 break;
3348 if (rc != 0) // STALL on errors
3349 fsg_set_halt(fsg, fsg->ep0);
3350 else // Complete the status stage
3351 ep0_queue(fsg);
3352 break;
3353
3354 case FSG_STATE_CONFIG_CHANGE:
3355 rc = do_set_config(fsg, new_config);
3356 if (fsg->ep0_req_tag != exception_req_tag)
3357 break;
3358 if (rc != 0) // STALL on errors
3359 fsg_set_halt(fsg, fsg->ep0);
3360 else // Complete the status stage
3361 ep0_queue(fsg);
3362 break;
3363
3364 case FSG_STATE_DISCONNECT:
3365 fsync_all(fsg);
3366 do_set_config(fsg, 0); // Unconfigured state
3367 break;
3368
3369 case FSG_STATE_EXIT:
3370 case FSG_STATE_TERMINATED:
3371 do_set_config(fsg, 0); // Free resources
3372 spin_lock_irq(&fsg->lock);
3373 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3374 spin_unlock_irq(&fsg->lock);
3375 break;
3376 }
3377 }
3378
3379
3380 /*-------------------------------------------------------------------------*/
3381
3382 static int fsg_main_thread(void *fsg_)
3383 {
3384 struct fsg_dev *fsg = (struct fsg_dev *) fsg_;
3385
3386 fsg->thread_task = current;
3387
3388 /* Release all our userspace resources */
3389 daemonize("file-storage-gadget");
3390
3391 /* Allow the thread to be killed by a signal, but set the signal mask
3392 * to block everything but INT, TERM, KILL, and USR1. */
3393 siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
3394 sigmask(SIGTERM) | sigmask(SIGKILL) |
3395 sigmask(SIGUSR1));
3396 sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
3397
3398 /* Arrange for userspace references to be interpreted as kernel
3399 * pointers. That way we can pass a kernel pointer to a routine
3400 * that expects a __user pointer and it will work okay. */
3401 set_fs(get_ds());
3402
3403 /* Wait for the gadget registration to finish up */
3404 wait_for_completion(&fsg->thread_notifier);
3405
3406 /* The main loop */
3407 while (fsg->state != FSG_STATE_TERMINATED) {
3408 if (exception_in_progress(fsg) || signal_pending(current)) {
3409 handle_exception(fsg);
3410 continue;
3411 }
3412
3413 if (!fsg->running) {
3414 sleep_thread(fsg);
3415 continue;
3416 }
3417
3418 if (get_next_command(fsg))
3419 continue;
3420
3421 spin_lock_irq(&fsg->lock);
3422 if (!exception_in_progress(fsg))
3423 fsg->state = FSG_STATE_DATA_PHASE;
3424 spin_unlock_irq(&fsg->lock);
3425
3426 if (do_scsi_command(fsg) || finish_reply(fsg))
3427 continue;
3428
3429 spin_lock_irq(&fsg->lock);
3430 if (!exception_in_progress(fsg))
3431 fsg->state = FSG_STATE_STATUS_PHASE;
3432 spin_unlock_irq(&fsg->lock);
3433
3434 if (send_status(fsg))
3435 continue;
3436
3437 spin_lock_irq(&fsg->lock);
3438 if (!exception_in_progress(fsg))
3439 fsg->state = FSG_STATE_IDLE;
3440 spin_unlock_irq(&fsg->lock);
3441 }
3442
3443 fsg->thread_task = NULL;
3444 flush_signals(current);
3445
3446 /* In case we are exiting because of a signal, unregister the
3447 * gadget driver and close the backing file. */
3448 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3449 usb_gadget_unregister_driver(&fsg_driver);
3450 close_all_backing_files(fsg);
3451 }
3452
3453 /* Let the unbind and cleanup routines know the thread has exited */
3454 complete_and_exit(&fsg->thread_notifier, 0);
3455 }
3456
3457
3458 /*-------------------------------------------------------------------------*/
3459
3460 /* If the next two routines are called while the gadget is registered,
3461 * the caller must own fsg->filesem for writing. */
3462
3463 static int open_backing_file(struct lun *curlun, const char *filename)
3464 {
3465 int ro;
3466 struct file *filp = NULL;
3467 int rc = -EINVAL;
3468 struct inode *inode = NULL;
3469 loff_t size;
3470 loff_t num_sectors;
3471
3472 /* R/W if we can, R/O if we must */
3473 ro = curlun->ro;
3474 if (!ro) {
3475 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3476 if (-EROFS == PTR_ERR(filp))
3477 ro = 1;
3478 }
3479 if (ro)
3480 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3481 if (IS_ERR(filp)) {
3482 LINFO(curlun, "unable to open backing file: %s\n", filename);
3483 return PTR_ERR(filp);
3484 }
3485
3486 if (!(filp->f_mode & FMODE_WRITE))
3487 ro = 1;
3488
3489 if (filp->f_dentry)
3490 inode = filp->f_dentry->d_inode;
3491 if (inode && S_ISBLK(inode->i_mode)) {
3492 if (bdev_read_only(inode->i_bdev))
3493 ro = 1;
3494 } else if (!inode || !S_ISREG(inode->i_mode)) {
3495 LINFO(curlun, "invalid file type: %s\n", filename);
3496 goto out;
3497 }
3498
3499 /* If we can't read the file, it's no good.
3500 * If we can't write the file, use it read-only. */
3501 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3502 LINFO(curlun, "file not readable: %s\n", filename);
3503 goto out;
3504 }
3505 if (!(filp->f_op->write || filp->f_op->aio_write))
3506 ro = 1;
3507
3508 size = i_size_read(inode->i_mapping->host);
3509 if (size < 0) {
3510 LINFO(curlun, "unable to find file size: %s\n", filename);
3511 rc = (int) size;
3512 goto out;
3513 }
3514 num_sectors = size >> 9; // File size in 512-byte sectors
3515 if (num_sectors == 0) {
3516 LINFO(curlun, "file too small: %s\n", filename);
3517 rc = -ETOOSMALL;
3518 goto out;
3519 }
3520
3521 get_file(filp);
3522 curlun->ro = ro;
3523 curlun->filp = filp;
3524 curlun->file_length = size;
3525 curlun->num_sectors = num_sectors;
3526 LDBG(curlun, "open backing file: %s\n", filename);
3527 rc = 0;
3528
3529 out:
3530 filp_close(filp, current->files);
3531 return rc;
3532 }
3533
3534
3535 static void close_backing_file(struct lun *curlun)
3536 {
3537 if (curlun->filp) {
3538 LDBG(curlun, "close backing file\n");
3539 fput(curlun->filp);
3540 curlun->filp = NULL;
3541 }
3542 }
3543
3544 static void close_all_backing_files(struct fsg_dev *fsg)
3545 {
3546 int i;
3547
3548 for (i = 0; i < fsg->nluns; ++i)
3549 close_backing_file(&fsg->luns[i]);
3550 }
3551
3552
3553 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3554 {
3555 struct lun *curlun = dev_to_lun(dev);
3556
3557 return sprintf(buf, "%d\n", curlun->ro);
3558 }
3559
3560 static ssize_t show_file(struct device *dev, struct device_attribute *attr, char *buf)
3561 {
3562 struct lun *curlun = dev_to_lun(dev);
3563 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3564 char *p;
3565 ssize_t rc;
3566
3567 down_read(&fsg->filesem);
3568 if (backing_file_is_open(curlun)) { // Get the complete pathname
3569 p = d_path(curlun->filp->f_dentry, curlun->filp->f_vfsmnt,
3570 buf, PAGE_SIZE - 1);
3571 if (IS_ERR(p))
3572 rc = PTR_ERR(p);
3573 else {
3574 rc = strlen(p);
3575 memmove(buf, p, rc);
3576 buf[rc] = '\n'; // Add a newline
3577 buf[++rc] = 0;
3578 }
3579 } else { // No file, return 0 bytes
3580 *buf = 0;
3581 rc = 0;
3582 }
3583 up_read(&fsg->filesem);
3584 return rc;
3585 }
3586
3587
3588 static ssize_t store_ro(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3589 {
3590 ssize_t rc = count;
3591 struct lun *curlun = dev_to_lun(dev);
3592 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3593 int i;
3594
3595 if (sscanf(buf, "%d", &i) != 1)
3596 return -EINVAL;
3597
3598 /* Allow the write-enable status to change only while the backing file
3599 * is closed. */
3600 down_read(&fsg->filesem);
3601 if (backing_file_is_open(curlun)) {
3602 LDBG(curlun, "read-only status change prevented\n");
3603 rc = -EBUSY;
3604 } else {
3605 curlun->ro = !!i;
3606 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3607 }
3608 up_read(&fsg->filesem);
3609 return rc;
3610 }
3611
3612 static ssize_t store_file(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3613 {
3614 struct lun *curlun = dev_to_lun(dev);
3615 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3616 int rc = 0;
3617
3618 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3619 LDBG(curlun, "eject attempt prevented\n");
3620 return -EBUSY; // "Door is locked"
3621 }
3622
3623 /* Remove a trailing newline */
3624 if (count > 0 && buf[count-1] == '\n')
3625 ((char *) buf)[count-1] = 0; // Ugh!
3626
3627 /* Eject current medium */
3628 down_write(&fsg->filesem);
3629 if (backing_file_is_open(curlun)) {
3630 close_backing_file(curlun);
3631 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3632 }
3633
3634 /* Load new medium */
3635 if (count > 0 && buf[0]) {
3636 rc = open_backing_file(curlun, buf);
3637 if (rc == 0)
3638 curlun->unit_attention_data =
3639 SS_NOT_READY_TO_READY_TRANSITION;
3640 }
3641 up_write(&fsg->filesem);
3642 return (rc < 0 ? rc : count);
3643 }
3644
3645
3646 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3647 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3648 static DEVICE_ATTR(file, 0444, show_file, NULL);
3649
3650
3651 /*-------------------------------------------------------------------------*/
3652
3653 static void lun_release(struct device *dev)
3654 {
3655 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3656
3657 complete(&fsg->lun_released);
3658 }
3659
3660 static void fsg_unbind(struct usb_gadget *gadget)
3661 {
3662 struct fsg_dev *fsg = get_gadget_data(gadget);
3663 int i;
3664 struct lun *curlun;
3665 struct usb_request *req = fsg->ep0req;
3666
3667 DBG(fsg, "unbind\n");
3668 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3669
3670 /* Unregister the sysfs attribute files and the LUNs */
3671 init_completion(&fsg->lun_released);
3672 for (i = 0; i < fsg->nluns; ++i) {
3673 curlun = &fsg->luns[i];
3674 if (curlun->registered) {
3675 device_remove_file(&curlun->dev, &dev_attr_ro);
3676 device_remove_file(&curlun->dev, &dev_attr_file);
3677 device_unregister(&curlun->dev);
3678 wait_for_completion(&fsg->lun_released);
3679 curlun->registered = 0;
3680 }
3681 }
3682
3683 /* If the thread isn't already dead, tell it to exit now */
3684 if (fsg->state != FSG_STATE_TERMINATED) {
3685 raise_exception(fsg, FSG_STATE_EXIT);
3686 wait_for_completion(&fsg->thread_notifier);
3687
3688 /* The cleanup routine waits for this completion also */
3689 complete(&fsg->thread_notifier);
3690 }
3691
3692 /* Free the data buffers */
3693 for (i = 0; i < NUM_BUFFERS; ++i) {
3694 struct fsg_buffhd *bh = &fsg->buffhds[i];
3695
3696 if (bh->buf)
3697 usb_ep_free_buffer(fsg->bulk_in, bh->buf, bh->dma,
3698 mod_data.buflen);
3699 }
3700
3701 /* Free the request and buffer for endpoint 0 */
3702 if (req) {
3703 if (req->buf)
3704 usb_ep_free_buffer(fsg->ep0, req->buf,
3705 req->dma, EP0_BUFSIZE);
3706 usb_ep_free_request(fsg->ep0, req);
3707 }
3708
3709 set_gadget_data(gadget, NULL);
3710 }
3711
3712
3713 static int __init check_parameters(struct fsg_dev *fsg)
3714 {
3715 int prot;
3716
3717 /* Store the default values */
3718 mod_data.transport_type = USB_PR_BULK;
3719 mod_data.transport_name = "Bulk-only";
3720 mod_data.protocol_type = USB_SC_SCSI;
3721 mod_data.protocol_name = "Transparent SCSI";
3722
3723 if (gadget_is_sh(fsg->gadget))
3724 mod_data.can_stall = 0;
3725
3726 if (mod_data.release == 0xffff) { // Parameter wasn't set
3727 if (gadget_is_net2280(fsg->gadget))
3728 mod_data.release = 0x0301;
3729 else if (gadget_is_dummy(fsg->gadget))
3730 mod_data.release = 0x0302;
3731 else if (gadget_is_pxa(fsg->gadget))
3732 mod_data.release = 0x0303;
3733 else if (gadget_is_sh(fsg->gadget))
3734 mod_data.release = 0x0304;
3735
3736 /* The sa1100 controller is not supported */
3737
3738 else if (gadget_is_goku(fsg->gadget))
3739 mod_data.release = 0x0306;
3740 else if (gadget_is_mq11xx(fsg->gadget))
3741 mod_data.release = 0x0307;
3742 else if (gadget_is_omap(fsg->gadget))
3743 mod_data.release = 0x0308;
3744 else if (gadget_is_lh7a40x(fsg->gadget))
3745 mod_data.release = 0x0309;
3746 else if (gadget_is_n9604(fsg->gadget))
3747 mod_data.release = 0x0310;
3748 else if (gadget_is_pxa27x(fsg->gadget))
3749 mod_data.release = 0x0311;
3750 else if (gadget_is_s3c2410(gadget))
3751 mod_data.release = 0x0312;
3752 else if (gadget_is_at91(fsg->gadget))
3753 mod_data.release = 0x0313;
3754 else {
3755 WARN(fsg, "controller '%s' not recognized\n",
3756 fsg->gadget->name);
3757 mod_data.release = 0x0399;
3758 }
3759 }
3760
3761 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3762
3763 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3764 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3765 ; // Use default setting
3766 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3767 mod_data.transport_type = USB_PR_CB;
3768 mod_data.transport_name = "Control-Bulk";
3769 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3770 mod_data.transport_type = USB_PR_CBI;
3771 mod_data.transport_name = "Control-Bulk-Interrupt";
3772 } else {
3773 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3774 return -EINVAL;
3775 }
3776
3777 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3778 prot == USB_SC_SCSI) {
3779 ; // Use default setting
3780 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3781 prot == USB_SC_RBC) {
3782 mod_data.protocol_type = USB_SC_RBC;
3783 mod_data.protocol_name = "RBC";
3784 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3785 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3786 prot == USB_SC_8020) {
3787 mod_data.protocol_type = USB_SC_8020;
3788 mod_data.protocol_name = "8020i (ATAPI)";
3789 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3790 prot == USB_SC_QIC) {
3791 mod_data.protocol_type = USB_SC_QIC;
3792 mod_data.protocol_name = "QIC-157";
3793 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3794 prot == USB_SC_UFI) {
3795 mod_data.protocol_type = USB_SC_UFI;
3796 mod_data.protocol_name = "UFI";
3797 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3798 prot == USB_SC_8070) {
3799 mod_data.protocol_type = USB_SC_8070;
3800 mod_data.protocol_name = "8070i";
3801 } else {
3802 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3803 return -EINVAL;
3804 }
3805
3806 mod_data.buflen &= PAGE_CACHE_MASK;
3807 if (mod_data.buflen <= 0) {
3808 ERROR(fsg, "invalid buflen\n");
3809 return -ETOOSMALL;
3810 }
3811 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3812
3813 return 0;
3814 }
3815
3816
3817 static int __init fsg_bind(struct usb_gadget *gadget)
3818 {
3819 struct fsg_dev *fsg = the_fsg;
3820 int rc;
3821 int i;
3822 struct lun *curlun;
3823 struct usb_ep *ep;
3824 struct usb_request *req;
3825 char *pathbuf, *p;
3826
3827 fsg->gadget = gadget;
3828 set_gadget_data(gadget, fsg);
3829 fsg->ep0 = gadget->ep0;
3830 fsg->ep0->driver_data = fsg;
3831
3832 if ((rc = check_parameters(fsg)) != 0)
3833 goto out;
3834
3835 if (mod_data.removable) { // Enable the store_xxx attributes
3836 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3837 dev_attr_ro.store = store_ro;
3838 dev_attr_file.store = store_file;
3839 }
3840
3841 /* Find out how many LUNs there should be */
3842 i = mod_data.nluns;
3843 if (i == 0)
3844 i = max(mod_data.num_filenames, 1);
3845 if (i > MAX_LUNS) {
3846 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3847 rc = -EINVAL;
3848 goto out;
3849 }
3850
3851 /* Create the LUNs, open their backing files, and register the
3852 * LUN devices in sysfs. */
3853 fsg->luns = kmalloc(i * sizeof(struct lun), GFP_KERNEL);
3854 if (!fsg->luns) {
3855 rc = -ENOMEM;
3856 goto out;
3857 }
3858 memset(fsg->luns, 0, i * sizeof(struct lun));
3859 fsg->nluns = i;
3860
3861 for (i = 0; i < fsg->nluns; ++i) {
3862 curlun = &fsg->luns[i];
3863 curlun->ro = ro[i];
3864 curlun->dev.parent = &gadget->dev;
3865 curlun->dev.driver = &fsg_driver.driver;
3866 dev_set_drvdata(&curlun->dev, fsg);
3867 snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3868 "%s-lun%d", gadget->dev.bus_id, i);
3869
3870 if ((rc = device_register(&curlun->dev)) != 0)
3871 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3872 else {
3873 curlun->registered = 1;
3874 curlun->dev.release = lun_release;
3875 device_create_file(&curlun->dev, &dev_attr_ro);
3876 device_create_file(&curlun->dev, &dev_attr_file);
3877 }
3878
3879 if (file[i] && *file[i]) {
3880 if ((rc = open_backing_file(curlun, file[i])) != 0)
3881 goto out;
3882 } else if (!mod_data.removable) {
3883 ERROR(fsg, "no file given for LUN%d\n", i);
3884 rc = -EINVAL;
3885 goto out;
3886 }
3887 }
3888
3889 /* Find all the endpoints we will use */
3890 usb_ep_autoconfig_reset(gadget);
3891 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3892 if (!ep)
3893 goto autoconf_fail;
3894 ep->driver_data = fsg; // claim the endpoint
3895 fsg->bulk_in = ep;
3896
3897 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3898 if (!ep)
3899 goto autoconf_fail;
3900 ep->driver_data = fsg; // claim the endpoint
3901 fsg->bulk_out = ep;
3902
3903 if (transport_is_cbi()) {
3904 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3905 if (!ep)
3906 goto autoconf_fail;
3907 ep->driver_data = fsg; // claim the endpoint
3908 fsg->intr_in = ep;
3909 }
3910
3911 /* Fix up the descriptors */
3912 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3913 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3914 device_desc.idProduct = cpu_to_le16(mod_data.product);
3915 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3916
3917 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3918 intf_desc.bNumEndpoints = i;
3919 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3920 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3921 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3922
3923 #ifdef CONFIG_USB_GADGET_DUALSPEED
3924 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3925
3926 /* Assume ep0 uses the same maxpacket value for both speeds */
3927 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3928
3929 /* Assume that all endpoint addresses are the same for both speeds */
3930 hs_bulk_in_desc.bEndpointAddress = fs_bulk_in_desc.bEndpointAddress;
3931 hs_bulk_out_desc.bEndpointAddress = fs_bulk_out_desc.bEndpointAddress;
3932 hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
3933 #endif
3934
3935 if (gadget->is_otg) {
3936 otg_desc.bmAttributes |= USB_OTG_HNP,
3937 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
3938 }
3939
3940 rc = -ENOMEM;
3941
3942 /* Allocate the request and buffer for endpoint 0 */
3943 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3944 if (!req)
3945 goto out;
3946 req->buf = usb_ep_alloc_buffer(fsg->ep0, EP0_BUFSIZE,
3947 &req->dma, GFP_KERNEL);
3948 if (!req->buf)
3949 goto out;
3950 req->complete = ep0_complete;
3951
3952 /* Allocate the data buffers */
3953 for (i = 0; i < NUM_BUFFERS; ++i) {
3954 struct fsg_buffhd *bh = &fsg->buffhds[i];
3955
3956 bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
3957 &bh->dma, GFP_KERNEL);
3958 if (!bh->buf)
3959 goto out;
3960 bh->next = bh + 1;
3961 }
3962 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3963
3964 /* This should reflect the actual gadget power source */
3965 usb_gadget_set_selfpowered(gadget);
3966
3967 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3968 system_utsname.sysname, system_utsname.release,
3969 gadget->name);
3970
3971 /* On a real device, serial[] would be loaded from permanent
3972 * storage. We just encode it from the driver version string. */
3973 for (i = 0; i < sizeof(serial) - 2; i += 2) {
3974 unsigned char c = DRIVER_VERSION[i / 2];
3975
3976 if (!c)
3977 break;
3978 sprintf(&serial[i], "%02X", c);
3979 }
3980
3981 if ((rc = kernel_thread(fsg_main_thread, fsg, (CLONE_VM | CLONE_FS |
3982 CLONE_FILES))) < 0)
3983 goto out;
3984 fsg->thread_pid = rc;
3985
3986 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
3987 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
3988
3989 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
3990 for (i = 0; i < fsg->nluns; ++i) {
3991 curlun = &fsg->luns[i];
3992 if (backing_file_is_open(curlun)) {
3993 p = NULL;
3994 if (pathbuf) {
3995 p = d_path(curlun->filp->f_dentry,
3996 curlun->filp->f_vfsmnt,
3997 pathbuf, PATH_MAX);
3998 if (IS_ERR(p))
3999 p = NULL;
4000 }
4001 LINFO(curlun, "ro=%d, file: %s\n",
4002 curlun->ro, (p ? p : "(error)"));
4003 }
4004 }
4005 kfree(pathbuf);
4006
4007 DBG(fsg, "transport=%s (x%02x)\n",
4008 mod_data.transport_name, mod_data.transport_type);
4009 DBG(fsg, "protocol=%s (x%02x)\n",
4010 mod_data.protocol_name, mod_data.protocol_type);
4011 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4012 mod_data.vendor, mod_data.product, mod_data.release);
4013 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
4014 mod_data.removable, mod_data.can_stall,
4015 mod_data.buflen);
4016 DBG(fsg, "I/O thread pid: %d\n", fsg->thread_pid);
4017 return 0;
4018
4019 autoconf_fail:
4020 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4021 rc = -ENOTSUPP;
4022
4023 out:
4024 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4025 fsg_unbind(gadget);
4026 close_all_backing_files(fsg);
4027 return rc;
4028 }
4029
4030
4031 /*-------------------------------------------------------------------------*/
4032
4033 static void fsg_suspend(struct usb_gadget *gadget)
4034 {
4035 struct fsg_dev *fsg = get_gadget_data(gadget);
4036
4037 DBG(fsg, "suspend\n");
4038 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4039 }
4040
4041 static void fsg_resume(struct usb_gadget *gadget)
4042 {
4043 struct fsg_dev *fsg = get_gadget_data(gadget);
4044
4045 DBG(fsg, "resume\n");
4046 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4047 }
4048
4049
4050 /*-------------------------------------------------------------------------*/
4051
4052 static struct usb_gadget_driver fsg_driver = {
4053 #ifdef CONFIG_USB_GADGET_DUALSPEED
4054 .speed = USB_SPEED_HIGH,
4055 #else
4056 .speed = USB_SPEED_FULL,
4057 #endif
4058 .function = (char *) longname,
4059 .bind = fsg_bind,
4060 .unbind = fsg_unbind,
4061 .disconnect = fsg_disconnect,
4062 .setup = fsg_setup,
4063 .suspend = fsg_suspend,
4064 .resume = fsg_resume,
4065
4066 .driver = {
4067 .name = (char *) shortname,
4068 // .release = ...
4069 // .suspend = ...
4070 // .resume = ...
4071 },
4072 };
4073
4074
4075 static int __init fsg_alloc(void)
4076 {
4077 struct fsg_dev *fsg;
4078
4079 fsg = kmalloc(sizeof *fsg, GFP_KERNEL);
4080 if (!fsg)
4081 return -ENOMEM;
4082 memset(fsg, 0, sizeof *fsg);
4083 spin_lock_init(&fsg->lock);
4084 init_rwsem(&fsg->filesem);
4085 init_waitqueue_head(&fsg->thread_wqh);
4086 init_completion(&fsg->thread_notifier);
4087
4088 the_fsg = fsg;
4089 return 0;
4090 }
4091
4092
4093 static void fsg_free(struct fsg_dev *fsg)
4094 {
4095 kfree(fsg->luns);
4096 kfree(fsg);
4097 }
4098
4099
4100 static int __init fsg_init(void)
4101 {
4102 int rc;
4103 struct fsg_dev *fsg;
4104
4105 if ((rc = fsg_alloc()) != 0)
4106 return rc;
4107 fsg = the_fsg;
4108 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) {
4109 fsg_free(fsg);
4110 return rc;
4111 }
4112 set_bit(REGISTERED, &fsg->atomic_bitflags);
4113
4114 /* Tell the thread to start working */
4115 complete(&fsg->thread_notifier);
4116 return 0;
4117 }
4118 module_init(fsg_init);
4119
4120
4121 static void __exit fsg_cleanup(void)
4122 {
4123 struct fsg_dev *fsg = the_fsg;
4124
4125 /* Unregister the driver iff the thread hasn't already done so */
4126 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4127 usb_gadget_unregister_driver(&fsg_driver);
4128
4129 /* Wait for the thread to finish up */
4130 wait_for_completion(&fsg->thread_notifier);
4131
4132 close_all_backing_files(fsg);
4133 fsg_free(fsg);
4134 }
4135 module_exit(fsg_cleanup);
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