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USB: g_file_storage: fix "ignoring return value" warnings
[linux-2.6/verdex.git] / drivers / usb / gadget / file_storage.c
blobd472c9c299040d24336423f0c8938570ff355198
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 * Note that the driver is slightly non-portable in that it assumes a
75 * single memory/DMA buffer will be useable for bulk-in, bulk-out, and
76 * interrupt-in endpoints. With most device controllers this isn't an
77 * issue, but there may be some with hardware restrictions that prevent
78 * a buffer from being used by more than one endpoint.
79 *
80 * Module options:
81 *
82 * file=filename[,filename...]
83 * Required if "removable" is not set, names of
84 * the files or block devices used for
85 * backing storage
86 * ro=b[,b...] Default false, booleans for read-only access
87 * removable Default false, boolean for removable media
88 * luns=N Default N = number of filenames, number of
89 * LUNs to support
90 * stall Default determined according to the type of
91 * USB device controller (usually true),
92 * boolean to permit the driver to halt
93 * bulk endpoints
94 * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
95 * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
96 * ATAPI, QIC, UFI, 8070, or SCSI;
97 * also 1 - 6)
98 * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
99 * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
100 * release=0xRRRR Override the USB release number (bcdDevice)
101 * buflen=N Default N=16384, buffer size used (will be
102 * rounded down to a multiple of
103 * PAGE_CACHE_SIZE)
104 *
105 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
106 * "removable", "luns", and "stall" options are available; default values
107 * are used for everything else.
108 *
109 * The pathnames of the backing files and the ro settings are available in
110 * the attribute files "file" and "ro" in the lun<n> subdirectory of the
111 * gadget's sysfs directory. If the "removable" option is set, writing to
112 * these files will simulate ejecting/loading the medium (writing an empty
113 * line means eject) and adjusting a write-enable tab. Changes to the ro
114 * setting are not allowed when the medium is loaded.
115 *
116 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
117 * The driver's SCSI command interface was based on the "Information
118 * technology - Small Computer System Interface - 2" document from
119 * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
120 * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception
121 * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
122 * "Universal Serial Bus Mass Storage Class UFI Command Specification"
123 * document, Revision 1.0, December 14, 1998, available at
124 * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
125 */
126
127
128 /*
129 * Driver Design
130 *
131 * The FSG driver is fairly straightforward. There is a main kernel
132 * thread that handles most of the work. Interrupt routines field
133 * callbacks from the controller driver: bulk- and interrupt-request
134 * completion notifications, endpoint-0 events, and disconnect events.
135 * Completion events are passed to the main thread by wakeup calls. Many
136 * ep0 requests are handled at interrupt time, but SetInterface,
137 * SetConfiguration, and device reset requests are forwarded to the
138 * thread in the form of "exceptions" using SIGUSR1 signals (since they
139 * should interrupt any ongoing file I/O operations).
140 *
141 * The thread's main routine implements the standard command/data/status
142 * parts of a SCSI interaction. It and its subroutines are full of tests
143 * for pending signals/exceptions -- all this polling is necessary since
144 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
145 * indication that the driver really wants to be running in userspace.)
146 * An important point is that so long as the thread is alive it keeps an
147 * open reference to the backing file. This will prevent unmounting
148 * the backing file's underlying filesystem and could cause problems
149 * during system shutdown, for example. To prevent such problems, the
150 * thread catches INT, TERM, and KILL signals and converts them into
151 * an EXIT exception.
152 *
153 * In normal operation the main thread is started during the gadget's
154 * fsg_bind() callback and stopped during fsg_unbind(). But it can also
155 * exit when it receives a signal, and there's no point leaving the
156 * gadget running when the thread is dead. So just before the thread
157 * exits, it deregisters the gadget driver. This makes things a little
158 * tricky: The driver is deregistered at two places, and the exiting
159 * thread can indirectly call fsg_unbind() which in turn can tell the
160 * thread to exit. The first problem is resolved through the use of the
161 * REGISTERED atomic bitflag; the driver will only be deregistered once.
162 * The second problem is resolved by having fsg_unbind() check
163 * fsg->state; it won't try to stop the thread if the state is already
164 * FSG_STATE_TERMINATED.
165 *
166 * To provide maximum throughput, the driver uses a circular pipeline of
167 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
168 * arbitrarily long; in practice the benefits don't justify having more
169 * than 2 stages (i.e., double buffering). But it helps to think of the
170 * pipeline as being a long one. Each buffer head contains a bulk-in and
171 * a bulk-out request pointer (since the buffer can be used for both
172 * output and input -- directions always are given from the host's
173 * point of view) as well as a pointer to the buffer and various state
174 * variables.
175 *
176 * Use of the pipeline follows a simple protocol. There is a variable
177 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
178 * At any time that buffer head may still be in use from an earlier
179 * request, so each buffer head has a state variable indicating whether
180 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
181 * buffer head to be EMPTY, filling the buffer either by file I/O or by
182 * USB I/O (during which the buffer head is BUSY), and marking the buffer
183 * head FULL when the I/O is complete. Then the buffer will be emptied
184 * (again possibly by USB I/O, during which it is marked BUSY) and
185 * finally marked EMPTY again (possibly by a completion routine).
186 *
187 * A module parameter tells the driver to avoid stalling the bulk
188 * endpoints wherever the transport specification allows. This is
189 * necessary for some UDCs like the SuperH, which cannot reliably clear a
190 * halt on a bulk endpoint. However, under certain circumstances the
191 * Bulk-only specification requires a stall. In such cases the driver
192 * will halt the endpoint and set a flag indicating that it should clear
193 * the halt in software during the next device reset. Hopefully this
194 * will permit everything to work correctly. Furthermore, although the
195 * specification allows the bulk-out endpoint to halt when the host sends
196 * too much data, implementing this would cause an unavoidable race.
197 * The driver will always use the "no-stall" approach for OUT transfers.
198 *
199 * One subtle point concerns sending status-stage responses for ep0
200 * requests. Some of these requests, such as device reset, can involve
201 * interrupting an ongoing file I/O operation, which might take an
202 * arbitrarily long time. During that delay the host might give up on
203 * the original ep0 request and issue a new one. When that happens the
204 * driver should not notify the host about completion of the original
205 * request, as the host will no longer be waiting for it. So the driver
206 * assigns to each ep0 request a unique tag, and it keeps track of the
207 * tag value of the request associated with a long-running exception
208 * (device-reset, interface-change, or configuration-change). When the
209 * exception handler is finished, the status-stage response is submitted
210 * only if the current ep0 request tag is equal to the exception request
211 * tag. Thus only the most recently received ep0 request will get a
212 * status-stage response.
213 *
214 * Warning: This driver source file is too long. It ought to be split up
215 * into a header file plus about 3 separate .c files, to handle the details
216 * of the Gadget, USB Mass Storage, and SCSI protocols.
217 */
218
219
220 #undef DEBUG
221 #undef VERBOSE
222 #undef DUMP_MSGS
223
224
225 #include <asm/system.h>
226 #include <asm/uaccess.h>
227
228 #include <linux/bitops.h>
229 #include <linux/blkdev.h>
230 #include <linux/compiler.h>
231 #include <linux/completion.h>
232 #include <linux/dcache.h>
233 #include <linux/delay.h>
234 #include <linux/device.h>
235 #include <linux/fcntl.h>
236 #include <linux/file.h>
237 #include <linux/fs.h>
238 #include <linux/init.h>
239 #include <linux/kernel.h>
240 #include <linux/kref.h>
241 #include <linux/kthread.h>
242 #include <linux/limits.h>
243 #include <linux/list.h>
244 #include <linux/module.h>
245 #include <linux/moduleparam.h>
246 #include <linux/pagemap.h>
247 #include <linux/rwsem.h>
248 #include <linux/sched.h>
249 #include <linux/signal.h>
250 #include <linux/slab.h>
251 #include <linux/spinlock.h>
252 #include <linux/string.h>
253 #include <linux/suspend.h>
254 #include <linux/utsname.h>
255
256 #include <linux/usb_ch9.h>
257 #include <linux/usb_gadget.h>
258
259 #include "gadget_chips.h"
260
261
262 /*-------------------------------------------------------------------------*/
263
264 #define DRIVER_DESC "File-backed Storage Gadget"
265 #define DRIVER_NAME "g_file_storage"
266 #define DRIVER_VERSION "28 November 2005"
267
268 static const char longname[] = DRIVER_DESC;
269 static const char shortname[] = DRIVER_NAME;
270
271 MODULE_DESCRIPTION(DRIVER_DESC);
272 MODULE_AUTHOR("Alan Stern");
273 MODULE_LICENSE("Dual BSD/GPL");
274
275 /* Thanks to NetChip Technologies for donating this product ID.
276 *
277 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
278 * Instead: allocate your own, using normal USB-IF procedures. */
279 #define DRIVER_VENDOR_ID 0x0525 // NetChip
280 #define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
281
282
283 /*
284 * This driver assumes self-powered hardware and has no way for users to
285 * trigger remote wakeup. It uses autoconfiguration to select endpoints
286 * and endpoint addresses.
287 */
288
289
290 /*-------------------------------------------------------------------------*/
291
292 #define xprintk(f,level,fmt,args...) \
293 dev_printk(level , &(f)->gadget->dev , fmt , ## args)
294 #define yprintk(l,level,fmt,args...) \
295 dev_printk(level , &(l)->dev , fmt , ## args)
296
297 #ifdef DEBUG
298 #define DBG(fsg,fmt,args...) \
299 xprintk(fsg , KERN_DEBUG , fmt , ## args)
300 #define LDBG(lun,fmt,args...) \
301 yprintk(lun , KERN_DEBUG , fmt , ## args)
302 #define MDBG(fmt,args...) \
303 printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
304 #else
305 #define DBG(fsg,fmt,args...) \
306 do { } while (0)
307 #define LDBG(lun,fmt,args...) \
308 do { } while (0)
309 #define MDBG(fmt,args...) \
310 do { } while (0)
311 #undef VERBOSE
312 #undef DUMP_MSGS
313 #endif /* DEBUG */
314
315 #ifdef VERBOSE
316 #define VDBG DBG
317 #define VLDBG LDBG
318 #else
319 #define VDBG(fsg,fmt,args...) \
320 do { } while (0)
321 #define VLDBG(lun,fmt,args...) \
322 do { } while (0)
323 #endif /* VERBOSE */
324
325 #define ERROR(fsg,fmt,args...) \
326 xprintk(fsg , KERN_ERR , fmt , ## args)
327 #define LERROR(lun,fmt,args...) \
328 yprintk(lun , KERN_ERR , fmt , ## args)
329
330 #define WARN(fsg,fmt,args...) \
331 xprintk(fsg , KERN_WARNING , fmt , ## args)
332 #define LWARN(lun,fmt,args...) \
333 yprintk(lun , KERN_WARNING , fmt , ## args)
334
335 #define INFO(fsg,fmt,args...) \
336 xprintk(fsg , KERN_INFO , fmt , ## args)
337 #define LINFO(lun,fmt,args...) \
338 yprintk(lun , KERN_INFO , fmt , ## args)
339
340 #define MINFO(fmt,args...) \
341 printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
342
343
344 /*-------------------------------------------------------------------------*/
345
346 /* Encapsulate the module parameter settings */
347
348 #define MAX_LUNS 8
349
350 static struct {
351 char *file[MAX_LUNS];
352 int ro[MAX_LUNS];
353 int num_filenames;
354 int num_ros;
355 unsigned int nluns;
356
357 int removable;
358 int can_stall;
359
360 char *transport_parm;
361 char *protocol_parm;
362 unsigned short vendor;
363 unsigned short product;
364 unsigned short release;
365 unsigned int buflen;
366
367 int transport_type;
368 char *transport_name;
369 int protocol_type;
370 char *protocol_name;
371
372 } mod_data = { // Default values
373 .transport_parm = "BBB",
374 .protocol_parm = "SCSI",
375 .removable = 0,
376 .can_stall = 1,
377 .vendor = DRIVER_VENDOR_ID,
378 .product = DRIVER_PRODUCT_ID,
379 .release = 0xffff, // Use controller chip type
380 .buflen = 16384,
381 };
382
383
384 module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
385 S_IRUGO);
386 MODULE_PARM_DESC(file, "names of backing files or devices");
387
388 module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
389 MODULE_PARM_DESC(ro, "true to force read-only");
390
391 module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
392 MODULE_PARM_DESC(luns, "number of LUNs");
393
394 module_param_named(removable, mod_data.removable, bool, S_IRUGO);
395 MODULE_PARM_DESC(removable, "true to simulate removable media");
396
397 module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
398 MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
399
400
401 /* In the non-TEST version, only the module parameters listed above
402 * are available. */
403 #ifdef CONFIG_USB_FILE_STORAGE_TEST
404
405 module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
406 MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
407
408 module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
409 MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
410 "8070, or SCSI)");
411
412 module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
413 MODULE_PARM_DESC(vendor, "USB Vendor ID");
414
415 module_param_named(product, mod_data.product, ushort, S_IRUGO);
416 MODULE_PARM_DESC(product, "USB Product ID");
417
418 module_param_named(release, mod_data.release, ushort, S_IRUGO);
419 MODULE_PARM_DESC(release, "USB release number");
420
421 module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
422 MODULE_PARM_DESC(buflen, "I/O buffer size");
423
424 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
425
426
427 /*-------------------------------------------------------------------------*/
428
429 /* USB protocol value = the transport method */
430 #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
431 #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
432 #define USB_PR_BULK 0x50 // Bulk-only
433
434 /* USB subclass value = the protocol encapsulation */
435 #define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
436 #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
437 #define USB_SC_QIC 0x03 // QIC-157 (tape)
438 #define USB_SC_UFI 0x04 // UFI (floppy)
439 #define USB_SC_8070 0x05 // SFF-8070i (removable)
440 #define USB_SC_SCSI 0x06 // Transparent SCSI
441
442 /* Bulk-only data structures */
443
444 /* Command Block Wrapper */
445 struct bulk_cb_wrap {
446 __le32 Signature; // Contains 'USBC'
447 u32 Tag; // Unique per command id
448 __le32 DataTransferLength; // Size of the data
449 u8 Flags; // Direction in bit 7
450 u8 Lun; // LUN (normally 0)
451 u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
452 u8 CDB[16]; // Command Data Block
453 };
454
455 #define USB_BULK_CB_WRAP_LEN 31
456 #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
457 #define USB_BULK_IN_FLAG 0x80
458
459 /* Command Status Wrapper */
460 struct bulk_cs_wrap {
461 __le32 Signature; // Should = 'USBS'
462 u32 Tag; // Same as original command
463 __le32 Residue; // Amount not transferred
464 u8 Status; // See below
465 };
466
467 #define USB_BULK_CS_WRAP_LEN 13
468 #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
469 #define USB_STATUS_PASS 0
470 #define USB_STATUS_FAIL 1
471 #define USB_STATUS_PHASE_ERROR 2
472
473 /* Bulk-only class specific requests */
474 #define USB_BULK_RESET_REQUEST 0xff
475 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
476
477
478 /* CBI Interrupt data structure */
479 struct interrupt_data {
480 u8 bType;
481 u8 bValue;
482 };
483
484 #define CBI_INTERRUPT_DATA_LEN 2
485
486 /* CBI Accept Device-Specific Command request */
487 #define USB_CBI_ADSC_REQUEST 0x00
488
489
490 #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
491
492 /* SCSI commands that we recognize */
493 #define SC_FORMAT_UNIT 0x04
494 #define SC_INQUIRY 0x12
495 #define SC_MODE_SELECT_6 0x15
496 #define SC_MODE_SELECT_10 0x55
497 #define SC_MODE_SENSE_6 0x1a
498 #define SC_MODE_SENSE_10 0x5a
499 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
500 #define SC_READ_6 0x08
501 #define SC_READ_10 0x28
502 #define SC_READ_12 0xa8
503 #define SC_READ_CAPACITY 0x25
504 #define SC_READ_FORMAT_CAPACITIES 0x23
505 #define SC_RELEASE 0x17
506 #define SC_REQUEST_SENSE 0x03
507 #define SC_RESERVE 0x16
508 #define SC_SEND_DIAGNOSTIC 0x1d
509 #define SC_START_STOP_UNIT 0x1b
510 #define SC_SYNCHRONIZE_CACHE 0x35
511 #define SC_TEST_UNIT_READY 0x00
512 #define SC_VERIFY 0x2f
513 #define SC_WRITE_6 0x0a
514 #define SC_WRITE_10 0x2a
515 #define SC_WRITE_12 0xaa
516
517 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
518 #define SS_NO_SENSE 0
519 #define SS_COMMUNICATION_FAILURE 0x040800
520 #define SS_INVALID_COMMAND 0x052000
521 #define SS_INVALID_FIELD_IN_CDB 0x052400
522 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
523 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
524 #define SS_MEDIUM_NOT_PRESENT 0x023a00
525 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
526 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
527 #define SS_RESET_OCCURRED 0x062900
528 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
529 #define SS_UNRECOVERED_READ_ERROR 0x031100
530 #define SS_WRITE_ERROR 0x030c02
531 #define SS_WRITE_PROTECTED 0x072700
532
533 #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
534 #define ASC(x) ((u8) ((x) >> 8))
535 #define ASCQ(x) ((u8) (x))
536
537
538 /*-------------------------------------------------------------------------*/
539
540 /*
541 * These definitions will permit the compiler to avoid generating code for
542 * parts of the driver that aren't used in the non-TEST version. Even gcc
543 * can recognize when a test of a constant expression yields a dead code
544 * path.
545 */
546
547 #ifdef CONFIG_USB_FILE_STORAGE_TEST
548
549 #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
550 #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
551 #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
552
553 #else
554
555 #define transport_is_bbb() 1
556 #define transport_is_cbi() 0
557 #define protocol_is_scsi() 1
558
559 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
560
561
562 struct lun {
563 struct file *filp;
564 loff_t file_length;
565 loff_t num_sectors;
566
567 unsigned int ro : 1;
568 unsigned int prevent_medium_removal : 1;
569 unsigned int registered : 1;
570
571 u32 sense_data;
572 u32 sense_data_info;
573 u32 unit_attention_data;
574
575 struct device dev;
576 };
577
578 #define backing_file_is_open(curlun) ((curlun)->filp != NULL)
579
580 static inline struct lun *dev_to_lun(struct device *dev)
581 {
582 return container_of(dev, struct lun, dev);
583 }
584
585
586 /* Big enough to hold our biggest descriptor */
587 #define EP0_BUFSIZE 256
588 #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
589
590 /* Number of buffers we will use. 2 is enough for double-buffering */
591 #define NUM_BUFFERS 2
592
593 enum fsg_buffer_state {
594 BUF_STATE_EMPTY = 0,
595 BUF_STATE_FULL,
596 BUF_STATE_BUSY
597 };
598
599 struct fsg_buffhd {
600 void *buf;
601 dma_addr_t dma;
602 enum fsg_buffer_state state;
603 struct fsg_buffhd *next;
604
605 /* The NetChip 2280 is faster, and handles some protocol faults
606 * better, if we don't submit any short bulk-out read requests.
607 * So we will record the intended request length here. */
608 unsigned int bulk_out_intended_length;
609
610 struct usb_request *inreq;
611 int inreq_busy;
612 struct usb_request *outreq;
613 int outreq_busy;
614 };
615
616 enum fsg_state {
617 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
618 FSG_STATE_DATA_PHASE,
619 FSG_STATE_STATUS_PHASE,
620
621 FSG_STATE_IDLE = 0,
622 FSG_STATE_ABORT_BULK_OUT,
623 FSG_STATE_RESET,
624 FSG_STATE_INTERFACE_CHANGE,
625 FSG_STATE_CONFIG_CHANGE,
626 FSG_STATE_DISCONNECT,
627 FSG_STATE_EXIT,
628 FSG_STATE_TERMINATED
629 };
630
631 enum data_direction {
632 DATA_DIR_UNKNOWN = 0,
633 DATA_DIR_FROM_HOST,
634 DATA_DIR_TO_HOST,
635 DATA_DIR_NONE
636 };
637
638 struct fsg_dev {
639 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
640 spinlock_t lock;
641 struct usb_gadget *gadget;
642
643 /* filesem protects: backing files in use */
644 struct rw_semaphore filesem;
645
646 /* reference counting: wait until all LUNs are released */
647 struct kref ref;
648
649 struct usb_ep *ep0; // Handy copy of gadget->ep0
650 struct usb_request *ep0req; // For control responses
651 unsigned int ep0_req_tag;
652 const char *ep0req_name;
653
654 struct usb_request *intreq; // For interrupt responses
655 int intreq_busy;
656 struct fsg_buffhd *intr_buffhd;
657
658 unsigned int bulk_out_maxpacket;
659 enum fsg_state state; // For exception handling
660 unsigned int exception_req_tag;
661
662 u8 config, new_config;
663
664 unsigned int running : 1;
665 unsigned int bulk_in_enabled : 1;
666 unsigned int bulk_out_enabled : 1;
667 unsigned int intr_in_enabled : 1;
668 unsigned int phase_error : 1;
669 unsigned int short_packet_received : 1;
670 unsigned int bad_lun_okay : 1;
671
672 unsigned long atomic_bitflags;
673 #define REGISTERED 0
674 #define CLEAR_BULK_HALTS 1
675 #define SUSPENDED 2
676
677 struct usb_ep *bulk_in;
678 struct usb_ep *bulk_out;
679 struct usb_ep *intr_in;
680
681 struct fsg_buffhd *next_buffhd_to_fill;
682 struct fsg_buffhd *next_buffhd_to_drain;
683 struct fsg_buffhd buffhds[NUM_BUFFERS];
684
685 int thread_wakeup_needed;
686 struct completion thread_notifier;
687 struct task_struct *thread_task;
688 sigset_t thread_signal_mask;
689
690 int cmnd_size;
691 u8 cmnd[MAX_COMMAND_SIZE];
692 enum data_direction data_dir;
693 u32 data_size;
694 u32 data_size_from_cmnd;
695 u32 tag;
696 unsigned int lun;
697 u32 residue;
698 u32 usb_amount_left;
699
700 /* The CB protocol offers no way for a host to know when a command
701 * has completed. As a result the next command may arrive early,
702 * and we will still have to handle it. For that reason we need
703 * a buffer to store new commands when using CB (or CBI, which
704 * does not oblige a host to wait for command completion either). */
705 int cbbuf_cmnd_size;
706 u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
707
708 unsigned int nluns;
709 struct lun *luns;
710 struct lun *curlun;
711 };
712
713 typedef void (*fsg_routine_t)(struct fsg_dev *);
714
715 static int inline exception_in_progress(struct fsg_dev *fsg)
716 {
717 return (fsg->state > FSG_STATE_IDLE);
718 }
719
720 /* Make bulk-out requests be divisible by the maxpacket size */
721 static void inline set_bulk_out_req_length(struct fsg_dev *fsg,
722 struct fsg_buffhd *bh, unsigned int length)
723 {
724 unsigned int rem;
725
726 bh->bulk_out_intended_length = length;
727 rem = length % fsg->bulk_out_maxpacket;
728 if (rem > 0)
729 length += fsg->bulk_out_maxpacket - rem;
730 bh->outreq->length = length;
731 }
732
733 static struct fsg_dev *the_fsg;
734 static struct usb_gadget_driver fsg_driver;
735
736 static void close_backing_file(struct lun *curlun);
737 static void close_all_backing_files(struct fsg_dev *fsg);
738
739
740 /*-------------------------------------------------------------------------*/
741
742 #ifdef DUMP_MSGS
743
744 static void dump_msg(struct fsg_dev *fsg, const char *label,
745 const u8 *buf, unsigned int length)
746 {
747 unsigned int start, num, i;
748 char line[52], *p;
749
750 if (length >= 512)
751 return;
752 DBG(fsg, "%s, length %u:\n", label, length);
753
754 start = 0;
755 while (length > 0) {
756 num = min(length, 16u);
757 p = line;
758 for (i = 0; i < num; ++i) {
759 if (i == 8)
760 *p++ = ' ';
761 sprintf(p, " %02x", buf[i]);
762 p += 3;
763 }
764 *p = 0;
765 printk(KERN_DEBUG "%6x: %s\n", start, line);
766 buf += num;
767 start += num;
768 length -= num;
769 }
770 }
771
772 static void inline dump_cdb(struct fsg_dev *fsg)
773 {}
774
775 #else
776
777 static void inline dump_msg(struct fsg_dev *fsg, const char *label,
778 const u8 *buf, unsigned int length)
779 {}
780
781 static void inline dump_cdb(struct fsg_dev *fsg)
782 {
783 int i;
784 char cmdbuf[3*MAX_COMMAND_SIZE + 1];
785
786 for (i = 0; i < fsg->cmnd_size; ++i)
787 sprintf(cmdbuf + i*3, " %02x", fsg->cmnd[i]);
788 VDBG(fsg, "SCSI CDB: %s\n", cmdbuf);
789 }
790
791 #endif /* DUMP_MSGS */
792
793
794 static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
795 {
796 const char *name;
797
798 if (ep == fsg->bulk_in)
799 name = "bulk-in";
800 else if (ep == fsg->bulk_out)
801 name = "bulk-out";
802 else
803 name = ep->name;
804 DBG(fsg, "%s set halt\n", name);
805 return usb_ep_set_halt(ep);
806 }
807
808
809 /*-------------------------------------------------------------------------*/
810
811 /* Routines for unaligned data access */
812
813 static u16 inline get_be16(u8 *buf)
814 {
815 return ((u16) buf[0] << 8) | ((u16) buf[1]);
816 }
817
818 static u32 inline get_be32(u8 *buf)
819 {
820 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
821 ((u32) buf[2] << 8) | ((u32) buf[3]);
822 }
823
824 static void inline put_be16(u8 *buf, u16 val)
825 {
826 buf[0] = val >> 8;
827 buf[1] = val;
828 }
829
830 static void inline put_be32(u8 *buf, u32 val)
831 {
832 buf[0] = val >> 24;
833 buf[1] = val >> 16;
834 buf[2] = val >> 8;
835 buf[3] = val & 0xff;
836 }
837
838
839 /*-------------------------------------------------------------------------*/
840
841 /*
842 * DESCRIPTORS ... most are static, but strings and (full) configuration
843 * descriptors are built on demand. Also the (static) config and interface
844 * descriptors are adjusted during fsg_bind().
845 */
846 #define STRING_MANUFACTURER 1
847 #define STRING_PRODUCT 2
848 #define STRING_SERIAL 3
849 #define STRING_CONFIG 4
850 #define STRING_INTERFACE 5
851
852 /* There is only one configuration. */
853 #define CONFIG_VALUE 1
854
855 static struct usb_device_descriptor
856 device_desc = {
857 .bLength = sizeof device_desc,
858 .bDescriptorType = USB_DT_DEVICE,
859
860 .bcdUSB = __constant_cpu_to_le16(0x0200),
861 .bDeviceClass = USB_CLASS_PER_INTERFACE,
862
863 /* The next three values can be overridden by module parameters */
864 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
865 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
866 .bcdDevice = __constant_cpu_to_le16(0xffff),
867
868 .iManufacturer = STRING_MANUFACTURER,
869 .iProduct = STRING_PRODUCT,
870 .iSerialNumber = STRING_SERIAL,
871 .bNumConfigurations = 1,
872 };
873
874 static struct usb_config_descriptor
875 config_desc = {
876 .bLength = sizeof config_desc,
877 .bDescriptorType = USB_DT_CONFIG,
878
879 /* wTotalLength computed by usb_gadget_config_buf() */
880 .bNumInterfaces = 1,
881 .bConfigurationValue = CONFIG_VALUE,
882 .iConfiguration = STRING_CONFIG,
883 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
884 .bMaxPower = 1, // self-powered
885 };
886
887 static struct usb_otg_descriptor
888 otg_desc = {
889 .bLength = sizeof(otg_desc),
890 .bDescriptorType = USB_DT_OTG,
891
892 .bmAttributes = USB_OTG_SRP,
893 };
894
895 /* There is only one interface. */
896
897 static struct usb_interface_descriptor
898 intf_desc = {
899 .bLength = sizeof intf_desc,
900 .bDescriptorType = USB_DT_INTERFACE,
901
902 .bNumEndpoints = 2, // Adjusted during fsg_bind()
903 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
904 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
905 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
906 .iInterface = STRING_INTERFACE,
907 };
908
909 /* Three full-speed endpoint descriptors: bulk-in, bulk-out,
910 * and interrupt-in. */
911
912 static struct usb_endpoint_descriptor
913 fs_bulk_in_desc = {
914 .bLength = USB_DT_ENDPOINT_SIZE,
915 .bDescriptorType = USB_DT_ENDPOINT,
916
917 .bEndpointAddress = USB_DIR_IN,
918 .bmAttributes = USB_ENDPOINT_XFER_BULK,
919 /* wMaxPacketSize set by autoconfiguration */
920 };
921
922 static struct usb_endpoint_descriptor
923 fs_bulk_out_desc = {
924 .bLength = USB_DT_ENDPOINT_SIZE,
925 .bDescriptorType = USB_DT_ENDPOINT,
926
927 .bEndpointAddress = USB_DIR_OUT,
928 .bmAttributes = USB_ENDPOINT_XFER_BULK,
929 /* wMaxPacketSize set by autoconfiguration */
930 };
931
932 static struct usb_endpoint_descriptor
933 fs_intr_in_desc = {
934 .bLength = USB_DT_ENDPOINT_SIZE,
935 .bDescriptorType = USB_DT_ENDPOINT,
936
937 .bEndpointAddress = USB_DIR_IN,
938 .bmAttributes = USB_ENDPOINT_XFER_INT,
939 .wMaxPacketSize = __constant_cpu_to_le16(2),
940 .bInterval = 32, // frames -> 32 ms
941 };
942
943 static const struct usb_descriptor_header *fs_function[] = {
944 (struct usb_descriptor_header *) &otg_desc,
945 (struct usb_descriptor_header *) &intf_desc,
946 (struct usb_descriptor_header *) &fs_bulk_in_desc,
947 (struct usb_descriptor_header *) &fs_bulk_out_desc,
948 (struct usb_descriptor_header *) &fs_intr_in_desc,
949 NULL,
950 };
951 #define FS_FUNCTION_PRE_EP_ENTRIES 2
952
953
954 #ifdef CONFIG_USB_GADGET_DUALSPEED
955
956 /*
957 * USB 2.0 devices need to expose both high speed and full speed
958 * descriptors, unless they only run at full speed.
959 *
960 * That means alternate endpoint descriptors (bigger packets)
961 * and a "device qualifier" ... plus more construction options
962 * for the config descriptor.
963 */
964 static struct usb_qualifier_descriptor
965 dev_qualifier = {
966 .bLength = sizeof dev_qualifier,
967 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
968
969 .bcdUSB = __constant_cpu_to_le16(0x0200),
970 .bDeviceClass = USB_CLASS_PER_INTERFACE,
971
972 .bNumConfigurations = 1,
973 };
974
975 static struct usb_endpoint_descriptor
976 hs_bulk_in_desc = {
977 .bLength = USB_DT_ENDPOINT_SIZE,
978 .bDescriptorType = USB_DT_ENDPOINT,
979
980 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
981 .bmAttributes = USB_ENDPOINT_XFER_BULK,
982 .wMaxPacketSize = __constant_cpu_to_le16(512),
983 };
984
985 static struct usb_endpoint_descriptor
986 hs_bulk_out_desc = {
987 .bLength = USB_DT_ENDPOINT_SIZE,
988 .bDescriptorType = USB_DT_ENDPOINT,
989
990 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
991 .bmAttributes = USB_ENDPOINT_XFER_BULK,
992 .wMaxPacketSize = __constant_cpu_to_le16(512),
993 .bInterval = 1, // NAK every 1 uframe
994 };
995
996 static struct usb_endpoint_descriptor
997 hs_intr_in_desc = {
998 .bLength = USB_DT_ENDPOINT_SIZE,
999 .bDescriptorType = USB_DT_ENDPOINT,
1000
1001 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
1002 .bmAttributes = USB_ENDPOINT_XFER_INT,
1003 .wMaxPacketSize = __constant_cpu_to_le16(2),
1004 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
1005 };
1006
1007 static const struct usb_descriptor_header *hs_function[] = {
1008 (struct usb_descriptor_header *) &otg_desc,
1009 (struct usb_descriptor_header *) &intf_desc,
1010 (struct usb_descriptor_header *) &hs_bulk_in_desc,
1011 (struct usb_descriptor_header *) &hs_bulk_out_desc,
1012 (struct usb_descriptor_header *) &hs_intr_in_desc,
1013 NULL,
1014 };
1015 #define HS_FUNCTION_PRE_EP_ENTRIES 2
1016
1017 /* Maxpacket and other transfer characteristics vary by speed. */
1018 #define ep_desc(g,fs,hs) (((g)->speed==USB_SPEED_HIGH) ? (hs) : (fs))
1019
1020 #else
1021
1022 /* If there's no high speed support, always use the full-speed descriptor. */
1023 #define ep_desc(g,fs,hs) fs
1024
1025 #endif /* !CONFIG_USB_GADGET_DUALSPEED */
1026
1027
1028 /* The CBI specification limits the serial string to 12 uppercase hexadecimal
1029 * characters. */
1030 static char manufacturer[64];
1031 static char serial[13];
1032
1033 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1034 static struct usb_string strings[] = {
1035 {STRING_MANUFACTURER, manufacturer},
1036 {STRING_PRODUCT, longname},
1037 {STRING_SERIAL, serial},
1038 {STRING_CONFIG, "Self-powered"},
1039 {STRING_INTERFACE, "Mass Storage"},
1040 {}
1041 };
1042
1043 static struct usb_gadget_strings stringtab = {
1044 .language = 0x0409, // en-us
1045 .strings = strings,
1046 };
1047
1048
1049 /*
1050 * Config descriptors must agree with the code that sets configurations
1051 * and with code managing interfaces and their altsettings. They must
1052 * also handle different speeds and other-speed requests.
1053 */
1054 static int populate_config_buf(struct usb_gadget *gadget,
1055 u8 *buf, u8 type, unsigned index)
1056 {
1057 #ifdef CONFIG_USB_GADGET_DUALSPEED
1058 enum usb_device_speed speed = gadget->speed;
1059 #endif
1060 int len;
1061 const struct usb_descriptor_header **function;
1062
1063 if (index > 0)
1064 return -EINVAL;
1065
1066 #ifdef CONFIG_USB_GADGET_DUALSPEED
1067 if (type == USB_DT_OTHER_SPEED_CONFIG)
1068 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1069 if (speed == USB_SPEED_HIGH)
1070 function = hs_function;
1071 else
1072 #endif
1073 function = fs_function;
1074
1075 /* for now, don't advertise srp-only devices */
1076 if (!gadget->is_otg)
1077 function++;
1078
1079 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1080 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1081 return len;
1082 }
1083
1084
1085 /*-------------------------------------------------------------------------*/
1086
1087 /* These routines may be called in process context or in_irq */
1088
1089 /* Caller must hold fsg->lock */
1090 static void wakeup_thread(struct fsg_dev *fsg)
1091 {
1092 /* Tell the main thread that something has happened */
1093 fsg->thread_wakeup_needed = 1;
1094 if (fsg->thread_task)
1095 wake_up_process(fsg->thread_task);
1096 }
1097
1098
1099 static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1100 {
1101 unsigned long flags;
1102
1103 /* Do nothing if a higher-priority exception is already in progress.
1104 * If a lower-or-equal priority exception is in progress, preempt it
1105 * and notify the main thread by sending it a signal. */
1106 spin_lock_irqsave(&fsg->lock, flags);
1107 if (fsg->state <= new_state) {
1108 fsg->exception_req_tag = fsg->ep0_req_tag;
1109 fsg->state = new_state;
1110 if (fsg->thread_task)
1111 send_sig_info(SIGUSR1, SEND_SIG_FORCED,
1112 fsg->thread_task);
1113 }
1114 spin_unlock_irqrestore(&fsg->lock, flags);
1115 }
1116
1117
1118 /*-------------------------------------------------------------------------*/
1119
1120 /* The disconnect callback and ep0 routines. These always run in_irq,
1121 * except that ep0_queue() is called in the main thread to acknowledge
1122 * completion of various requests: set config, set interface, and
1123 * Bulk-only device reset. */
1124
1125 static void fsg_disconnect(struct usb_gadget *gadget)
1126 {
1127 struct fsg_dev *fsg = get_gadget_data(gadget);
1128
1129 DBG(fsg, "disconnect or port reset\n");
1130 raise_exception(fsg, FSG_STATE_DISCONNECT);
1131 }
1132
1133
1134 static int ep0_queue(struct fsg_dev *fsg)
1135 {
1136 int rc;
1137
1138 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1139 if (rc != 0 && rc != -ESHUTDOWN) {
1140
1141 /* We can't do much more than wait for a reset */
1142 WARN(fsg, "error in submission: %s --> %d\n",
1143 fsg->ep0->name, rc);
1144 }
1145 return rc;
1146 }
1147
1148 static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1149 {
1150 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1151
1152 if (req->actual > 0)
1153 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1154 if (req->status || req->actual != req->length)
1155 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1156 req->status, req->actual, req->length);
1157 if (req->status == -ECONNRESET) // Request was cancelled
1158 usb_ep_fifo_flush(ep);
1159
1160 if (req->status == 0 && req->context)
1161 ((fsg_routine_t) (req->context))(fsg);
1162 }
1163
1164
1165 /*-------------------------------------------------------------------------*/
1166
1167 /* Bulk and interrupt endpoint completion handlers.
1168 * These always run in_irq. */
1169
1170 static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1171 {
1172 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1173 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1174
1175 if (req->status || req->actual != req->length)
1176 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1177 req->status, req->actual, req->length);
1178 if (req->status == -ECONNRESET) // Request was cancelled
1179 usb_ep_fifo_flush(ep);
1180
1181 /* Hold the lock while we update the request and buffer states */
1182 smp_wmb();
1183 spin_lock(&fsg->lock);
1184 bh->inreq_busy = 0;
1185 bh->state = BUF_STATE_EMPTY;
1186 wakeup_thread(fsg);
1187 spin_unlock(&fsg->lock);
1188 }
1189
1190 static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1191 {
1192 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1193 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1194
1195 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1196 if (req->status || req->actual != bh->bulk_out_intended_length)
1197 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1198 req->status, req->actual,
1199 bh->bulk_out_intended_length);
1200 if (req->status == -ECONNRESET) // Request was cancelled
1201 usb_ep_fifo_flush(ep);
1202
1203 /* Hold the lock while we update the request and buffer states */
1204 smp_wmb();
1205 spin_lock(&fsg->lock);
1206 bh->outreq_busy = 0;
1207 bh->state = BUF_STATE_FULL;
1208 wakeup_thread(fsg);
1209 spin_unlock(&fsg->lock);
1210 }
1211
1212
1213 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1214 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1215 {
1216 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1217 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1218
1219 if (req->status || req->actual != req->length)
1220 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1221 req->status, req->actual, req->length);
1222 if (req->status == -ECONNRESET) // Request was cancelled
1223 usb_ep_fifo_flush(ep);
1224
1225 /* Hold the lock while we update the request and buffer states */
1226 smp_wmb();
1227 spin_lock(&fsg->lock);
1228 fsg->intreq_busy = 0;
1229 bh->state = BUF_STATE_EMPTY;
1230 wakeup_thread(fsg);
1231 spin_unlock(&fsg->lock);
1232 }
1233
1234 #else
1235 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1236 {}
1237 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1238
1239
1240 /*-------------------------------------------------------------------------*/
1241
1242 /* Ep0 class-specific handlers. These always run in_irq. */
1243
1244 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1245 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1246 {
1247 struct usb_request *req = fsg->ep0req;
1248 static u8 cbi_reset_cmnd[6] = {
1249 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1250
1251 /* Error in command transfer? */
1252 if (req->status || req->length != req->actual ||
1253 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1254
1255 /* Not all controllers allow a protocol stall after
1256 * receiving control-out data, but we'll try anyway. */
1257 fsg_set_halt(fsg, fsg->ep0);
1258 return; // Wait for reset
1259 }
1260
1261 /* Is it the special reset command? */
1262 if (req->actual >= sizeof cbi_reset_cmnd &&
1263 memcmp(req->buf, cbi_reset_cmnd,
1264 sizeof cbi_reset_cmnd) == 0) {
1265
1266 /* Raise an exception to stop the current operation
1267 * and reinitialize our state. */
1268 DBG(fsg, "cbi reset request\n");
1269 raise_exception(fsg, FSG_STATE_RESET);
1270 return;
1271 }
1272
1273 VDBG(fsg, "CB[I] accept device-specific command\n");
1274 spin_lock(&fsg->lock);
1275
1276 /* Save the command for later */
1277 if (fsg->cbbuf_cmnd_size)
1278 WARN(fsg, "CB[I] overwriting previous command\n");
1279 fsg->cbbuf_cmnd_size = req->actual;
1280 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1281
1282 wakeup_thread(fsg);
1283 spin_unlock(&fsg->lock);
1284 }
1285
1286 #else
1287 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1288 {}
1289 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1290
1291
1292 static int class_setup_req(struct fsg_dev *fsg,
1293 const struct usb_ctrlrequest *ctrl)
1294 {
1295 struct usb_request *req = fsg->ep0req;
1296 int value = -EOPNOTSUPP;
1297 u16 w_index = le16_to_cpu(ctrl->wIndex);
1298 u16 w_length = le16_to_cpu(ctrl->wLength);
1299
1300 if (!fsg->config)
1301 return value;
1302
1303 /* Handle Bulk-only class-specific requests */
1304 if (transport_is_bbb()) {
1305 switch (ctrl->bRequest) {
1306
1307 case USB_BULK_RESET_REQUEST:
1308 if (ctrl->bRequestType != (USB_DIR_OUT |
1309 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1310 break;
1311 if (w_index != 0) {
1312 value = -EDOM;
1313 break;
1314 }
1315
1316 /* Raise an exception to stop the current operation
1317 * and reinitialize our state. */
1318 DBG(fsg, "bulk reset request\n");
1319 raise_exception(fsg, FSG_STATE_RESET);
1320 value = DELAYED_STATUS;
1321 break;
1322
1323 case USB_BULK_GET_MAX_LUN_REQUEST:
1324 if (ctrl->bRequestType != (USB_DIR_IN |
1325 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1326 break;
1327 if (w_index != 0) {
1328 value = -EDOM;
1329 break;
1330 }
1331 VDBG(fsg, "get max LUN\n");
1332 *(u8 *) req->buf = fsg->nluns - 1;
1333 value = 1;
1334 break;
1335 }
1336 }
1337
1338 /* Handle CBI class-specific requests */
1339 else {
1340 switch (ctrl->bRequest) {
1341
1342 case USB_CBI_ADSC_REQUEST:
1343 if (ctrl->bRequestType != (USB_DIR_OUT |
1344 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1345 break;
1346 if (w_index != 0) {
1347 value = -EDOM;
1348 break;
1349 }
1350 if (w_length > MAX_COMMAND_SIZE) {
1351 value = -EOVERFLOW;
1352 break;
1353 }
1354 value = w_length;
1355 fsg->ep0req->context = received_cbi_adsc;
1356 break;
1357 }
1358 }
1359
1360 if (value == -EOPNOTSUPP)
1361 VDBG(fsg,
1362 "unknown class-specific control req "
1363 "%02x.%02x v%04x i%04x l%u\n",
1364 ctrl->bRequestType, ctrl->bRequest,
1365 le16_to_cpu(ctrl->wValue), w_index, w_length);
1366 return value;
1367 }
1368
1369
1370 /*-------------------------------------------------------------------------*/
1371
1372 /* Ep0 standard request handlers. These always run in_irq. */
1373
1374 static int standard_setup_req(struct fsg_dev *fsg,
1375 const struct usb_ctrlrequest *ctrl)
1376 {
1377 struct usb_request *req = fsg->ep0req;
1378 int value = -EOPNOTSUPP;
1379 u16 w_index = le16_to_cpu(ctrl->wIndex);
1380 u16 w_value = le16_to_cpu(ctrl->wValue);
1381
1382 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1383 * but config change events will also reconfigure hardware. */
1384 switch (ctrl->bRequest) {
1385
1386 case USB_REQ_GET_DESCRIPTOR:
1387 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1388 USB_RECIP_DEVICE))
1389 break;
1390 switch (w_value >> 8) {
1391
1392 case USB_DT_DEVICE:
1393 VDBG(fsg, "get device descriptor\n");
1394 value = sizeof device_desc;
1395 memcpy(req->buf, &device_desc, value);
1396 break;
1397 #ifdef CONFIG_USB_GADGET_DUALSPEED
1398 case USB_DT_DEVICE_QUALIFIER:
1399 VDBG(fsg, "get device qualifier\n");
1400 if (!fsg->gadget->is_dualspeed)
1401 break;
1402 value = sizeof dev_qualifier;
1403 memcpy(req->buf, &dev_qualifier, value);
1404 break;
1405
1406 case USB_DT_OTHER_SPEED_CONFIG:
1407 VDBG(fsg, "get other-speed config descriptor\n");
1408 if (!fsg->gadget->is_dualspeed)
1409 break;
1410 goto get_config;
1411 #endif
1412 case USB_DT_CONFIG:
1413 VDBG(fsg, "get configuration descriptor\n");
1414 #ifdef CONFIG_USB_GADGET_DUALSPEED
1415 get_config:
1416 #endif
1417 value = populate_config_buf(fsg->gadget,
1418 req->buf,
1419 w_value >> 8,
1420 w_value & 0xff);
1421 break;
1422
1423 case USB_DT_STRING:
1424 VDBG(fsg, "get string descriptor\n");
1425
1426 /* wIndex == language code */
1427 value = usb_gadget_get_string(&stringtab,
1428 w_value & 0xff, req->buf);
1429 break;
1430 }
1431 break;
1432
1433 /* One config, two speeds */
1434 case USB_REQ_SET_CONFIGURATION:
1435 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1436 USB_RECIP_DEVICE))
1437 break;
1438 VDBG(fsg, "set configuration\n");
1439 if (w_value == CONFIG_VALUE || w_value == 0) {
1440 fsg->new_config = w_value;
1441
1442 /* Raise an exception to wipe out previous transaction
1443 * state (queued bufs, etc) and set the new config. */
1444 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1445 value = DELAYED_STATUS;
1446 }
1447 break;
1448 case USB_REQ_GET_CONFIGURATION:
1449 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1450 USB_RECIP_DEVICE))
1451 break;
1452 VDBG(fsg, "get configuration\n");
1453 *(u8 *) req->buf = fsg->config;
1454 value = 1;
1455 break;
1456
1457 case USB_REQ_SET_INTERFACE:
1458 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1459 USB_RECIP_INTERFACE))
1460 break;
1461 if (fsg->config && w_index == 0) {
1462
1463 /* Raise an exception to wipe out previous transaction
1464 * state (queued bufs, etc) and install the new
1465 * interface altsetting. */
1466 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1467 value = DELAYED_STATUS;
1468 }
1469 break;
1470 case USB_REQ_GET_INTERFACE:
1471 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1472 USB_RECIP_INTERFACE))
1473 break;
1474 if (!fsg->config)
1475 break;
1476 if (w_index != 0) {
1477 value = -EDOM;
1478 break;
1479 }
1480 VDBG(fsg, "get interface\n");
1481 *(u8 *) req->buf = 0;
1482 value = 1;
1483 break;
1484
1485 default:
1486 VDBG(fsg,
1487 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1488 ctrl->bRequestType, ctrl->bRequest,
1489 w_value, w_index, le16_to_cpu(ctrl->wLength));
1490 }
1491
1492 return value;
1493 }
1494
1495
1496 static int fsg_setup(struct usb_gadget *gadget,
1497 const struct usb_ctrlrequest *ctrl)
1498 {
1499 struct fsg_dev *fsg = get_gadget_data(gadget);
1500 int rc;
1501 int w_length = le16_to_cpu(ctrl->wLength);
1502
1503 ++fsg->ep0_req_tag; // Record arrival of a new request
1504 fsg->ep0req->context = NULL;
1505 fsg->ep0req->length = 0;
1506 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1507
1508 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1509 rc = class_setup_req(fsg, ctrl);
1510 else
1511 rc = standard_setup_req(fsg, ctrl);
1512
1513 /* Respond with data/status or defer until later? */
1514 if (rc >= 0 && rc != DELAYED_STATUS) {
1515 rc = min(rc, w_length);
1516 fsg->ep0req->length = rc;
1517 fsg->ep0req->zero = rc < w_length;
1518 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1519 "ep0-in" : "ep0-out");
1520 rc = ep0_queue(fsg);
1521 }
1522
1523 /* Device either stalls (rc < 0) or reports success */
1524 return rc;
1525 }
1526
1527
1528 /*-------------------------------------------------------------------------*/
1529
1530 /* All the following routines run in process context */
1531
1532
1533 /* Use this for bulk or interrupt transfers, not ep0 */
1534 static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1535 struct usb_request *req, int *pbusy,
1536 enum fsg_buffer_state *state)
1537 {
1538 int rc;
1539
1540 if (ep == fsg->bulk_in)
1541 dump_msg(fsg, "bulk-in", req->buf, req->length);
1542 else if (ep == fsg->intr_in)
1543 dump_msg(fsg, "intr-in", req->buf, req->length);
1544
1545 spin_lock_irq(&fsg->lock);
1546 *pbusy = 1;
1547 *state = BUF_STATE_BUSY;
1548 spin_unlock_irq(&fsg->lock);
1549 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1550 if (rc != 0) {
1551 *pbusy = 0;
1552 *state = BUF_STATE_EMPTY;
1553
1554 /* We can't do much more than wait for a reset */
1555
1556 /* Note: currently the net2280 driver fails zero-length
1557 * submissions if DMA is enabled. */
1558 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1559 req->length == 0))
1560 WARN(fsg, "error in submission: %s --> %d\n",
1561 ep->name, rc);
1562 }
1563 }
1564
1565
1566 static int sleep_thread(struct fsg_dev *fsg)
1567 {
1568 int rc = 0;
1569
1570 /* Wait until a signal arrives or we are woken up */
1571 for (;;) {
1572 try_to_freeze();
1573 set_current_state(TASK_INTERRUPTIBLE);
1574 if (signal_pending(current)) {
1575 rc = -EINTR;
1576 break;
1577 }
1578 if (fsg->thread_wakeup_needed)
1579 break;
1580 schedule();
1581 }
1582 __set_current_state(TASK_RUNNING);
1583 fsg->thread_wakeup_needed = 0;
1584 return rc;
1585 }
1586
1587
1588 /*-------------------------------------------------------------------------*/
1589
1590 static int do_read(struct fsg_dev *fsg)
1591 {
1592 struct lun *curlun = fsg->curlun;
1593 u32 lba;
1594 struct fsg_buffhd *bh;
1595 int rc;
1596 u32 amount_left;
1597 loff_t file_offset, file_offset_tmp;
1598 unsigned int amount;
1599 unsigned int partial_page;
1600 ssize_t nread;
1601
1602 /* Get the starting Logical Block Address and check that it's
1603 * not too big */
1604 if (fsg->cmnd[0] == SC_READ_6)
1605 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1606 else {
1607 lba = get_be32(&fsg->cmnd[2]);
1608
1609 /* We allow DPO (Disable Page Out = don't save data in the
1610 * cache) and FUA (Force Unit Access = don't read from the
1611 * cache), but we don't implement them. */
1612 if ((fsg->cmnd[1] & ~0x18) != 0) {
1613 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1614 return -EINVAL;
1615 }
1616 }
1617 if (lba >= curlun->num_sectors) {
1618 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1619 return -EINVAL;
1620 }
1621 file_offset = ((loff_t) lba) << 9;
1622
1623 /* Carry out the file reads */
1624 amount_left = fsg->data_size_from_cmnd;
1625 if (unlikely(amount_left == 0))
1626 return -EIO; // No default reply
1627
1628 for (;;) {
1629
1630 /* Figure out how much we need to read:
1631 * Try to read the remaining amount.
1632 * But don't read more than the buffer size.
1633 * And don't try to read past the end of the file.
1634 * Finally, if we're not at a page boundary, don't read past
1635 * the next page.
1636 * If this means reading 0 then we were asked to read past
1637 * the end of file. */
1638 amount = min((unsigned int) amount_left, mod_data.buflen);
1639 amount = min((loff_t) amount,
1640 curlun->file_length - file_offset);
1641 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1642 if (partial_page > 0)
1643 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1644 partial_page);
1645
1646 /* Wait for the next buffer to become available */
1647 bh = fsg->next_buffhd_to_fill;
1648 while (bh->state != BUF_STATE_EMPTY) {
1649 if ((rc = sleep_thread(fsg)) != 0)
1650 return rc;
1651 }
1652
1653 /* If we were asked to read past the end of file,
1654 * end with an empty buffer. */
1655 if (amount == 0) {
1656 curlun->sense_data =
1657 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1658 curlun->sense_data_info = file_offset >> 9;
1659 bh->inreq->length = 0;
1660 bh->state = BUF_STATE_FULL;
1661 break;
1662 }
1663
1664 /* Perform the read */
1665 file_offset_tmp = file_offset;
1666 nread = vfs_read(curlun->filp,
1667 (char __user *) bh->buf,
1668 amount, &file_offset_tmp);
1669 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1670 (unsigned long long) file_offset,
1671 (int) nread);
1672 if (signal_pending(current))
1673 return -EINTR;
1674
1675 if (nread < 0) {
1676 LDBG(curlun, "error in file read: %d\n",
1677 (int) nread);
1678 nread = 0;
1679 } else if (nread < amount) {
1680 LDBG(curlun, "partial file read: %d/%u\n",
1681 (int) nread, amount);
1682 nread -= (nread & 511); // Round down to a block
1683 }
1684 file_offset += nread;
1685 amount_left -= nread;
1686 fsg->residue -= nread;
1687 bh->inreq->length = nread;
1688 bh->state = BUF_STATE_FULL;
1689
1690 /* If an error occurred, report it and its position */
1691 if (nread < amount) {
1692 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1693 curlun->sense_data_info = file_offset >> 9;
1694 break;
1695 }
1696
1697 if (amount_left == 0)
1698 break; // No more left to read
1699
1700 /* Send this buffer and go read some more */
1701 bh->inreq->zero = 0;
1702 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1703 &bh->inreq_busy, &bh->state);
1704 fsg->next_buffhd_to_fill = bh->next;
1705 }
1706
1707 return -EIO; // No default reply
1708 }
1709
1710
1711 /*-------------------------------------------------------------------------*/
1712
1713 static int do_write(struct fsg_dev *fsg)
1714 {
1715 struct lun *curlun = fsg->curlun;
1716 u32 lba;
1717 struct fsg_buffhd *bh;
1718 int get_some_more;
1719 u32 amount_left_to_req, amount_left_to_write;
1720 loff_t usb_offset, file_offset, file_offset_tmp;
1721 unsigned int amount;
1722 unsigned int partial_page;
1723 ssize_t nwritten;
1724 int rc;
1725
1726 if (curlun->ro) {
1727 curlun->sense_data = SS_WRITE_PROTECTED;
1728 return -EINVAL;
1729 }
1730 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1731
1732 /* Get the starting Logical Block Address and check that it's
1733 * not too big */
1734 if (fsg->cmnd[0] == SC_WRITE_6)
1735 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1736 else {
1737 lba = get_be32(&fsg->cmnd[2]);
1738
1739 /* We allow DPO (Disable Page Out = don't save data in the
1740 * cache) and FUA (Force Unit Access = write directly to the
1741 * medium). We don't implement DPO; we implement FUA by
1742 * performing synchronous output. */
1743 if ((fsg->cmnd[1] & ~0x18) != 0) {
1744 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1745 return -EINVAL;
1746 }
1747 if (fsg->cmnd[1] & 0x08) // FUA
1748 curlun->filp->f_flags |= O_SYNC;
1749 }
1750 if (lba >= curlun->num_sectors) {
1751 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1752 return -EINVAL;
1753 }
1754
1755 /* Carry out the file writes */
1756 get_some_more = 1;
1757 file_offset = usb_offset = ((loff_t) lba) << 9;
1758 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1759
1760 while (amount_left_to_write > 0) {
1761
1762 /* Queue a request for more data from the host */
1763 bh = fsg->next_buffhd_to_fill;
1764 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1765
1766 /* Figure out how much we want to get:
1767 * Try to get the remaining amount.
1768 * But don't get more than the buffer size.
1769 * And don't try to go past the end of the file.
1770 * If we're not at a page boundary,
1771 * don't go past the next page.
1772 * If this means getting 0, then we were asked
1773 * to write past the end of file.
1774 * Finally, round down to a block boundary. */
1775 amount = min(amount_left_to_req, mod_data.buflen);
1776 amount = min((loff_t) amount, curlun->file_length -
1777 usb_offset);
1778 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1779 if (partial_page > 0)
1780 amount = min(amount,
1781 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1782
1783 if (amount == 0) {
1784 get_some_more = 0;
1785 curlun->sense_data =
1786 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1787 curlun->sense_data_info = usb_offset >> 9;
1788 continue;
1789 }
1790 amount -= (amount & 511);
1791 if (amount == 0) {
1792
1793 /* Why were we were asked to transfer a
1794 * partial block? */
1795 get_some_more = 0;
1796 continue;
1797 }
1798
1799 /* Get the next buffer */
1800 usb_offset += amount;
1801 fsg->usb_amount_left -= amount;
1802 amount_left_to_req -= amount;
1803 if (amount_left_to_req == 0)
1804 get_some_more = 0;
1805
1806 /* amount is always divisible by 512, hence by
1807 * the bulk-out maxpacket size */
1808 bh->outreq->length = bh->bulk_out_intended_length =
1809 amount;
1810 bh->outreq->short_not_ok = 1;
1811 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1812 &bh->outreq_busy, &bh->state);
1813 fsg->next_buffhd_to_fill = bh->next;
1814 continue;
1815 }
1816
1817 /* Write the received data to the backing file */
1818 bh = fsg->next_buffhd_to_drain;
1819 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1820 break; // We stopped early
1821 if (bh->state == BUF_STATE_FULL) {
1822 smp_rmb();
1823 fsg->next_buffhd_to_drain = bh->next;
1824 bh->state = BUF_STATE_EMPTY;
1825
1826 /* Did something go wrong with the transfer? */
1827 if (bh->outreq->status != 0) {
1828 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1829 curlun->sense_data_info = file_offset >> 9;
1830 break;
1831 }
1832
1833 amount = bh->outreq->actual;
1834 if (curlun->file_length - file_offset < amount) {
1835 LERROR(curlun,
1836 "write %u @ %llu beyond end %llu\n",
1837 amount, (unsigned long long) file_offset,
1838 (unsigned long long) curlun->file_length);
1839 amount = curlun->file_length - file_offset;
1840 }
1841
1842 /* Perform the write */
1843 file_offset_tmp = file_offset;
1844 nwritten = vfs_write(curlun->filp,
1845 (char __user *) bh->buf,
1846 amount, &file_offset_tmp);
1847 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1848 (unsigned long long) file_offset,
1849 (int) nwritten);
1850 if (signal_pending(current))
1851 return -EINTR; // Interrupted!
1852
1853 if (nwritten < 0) {
1854 LDBG(curlun, "error in file write: %d\n",
1855 (int) nwritten);
1856 nwritten = 0;
1857 } else if (nwritten < amount) {
1858 LDBG(curlun, "partial file write: %d/%u\n",
1859 (int) nwritten, amount);
1860 nwritten -= (nwritten & 511);
1861 // Round down to a block
1862 }
1863 file_offset += nwritten;
1864 amount_left_to_write -= nwritten;
1865 fsg->residue -= nwritten;
1866
1867 /* If an error occurred, report it and its position */
1868 if (nwritten < amount) {
1869 curlun->sense_data = SS_WRITE_ERROR;
1870 curlun->sense_data_info = file_offset >> 9;
1871 break;
1872 }
1873
1874 /* Did the host decide to stop early? */
1875 if (bh->outreq->actual != bh->outreq->length) {
1876 fsg->short_packet_received = 1;
1877 break;
1878 }
1879 continue;
1880 }
1881
1882 /* Wait for something to happen */
1883 if ((rc = sleep_thread(fsg)) != 0)
1884 return rc;
1885 }
1886
1887 return -EIO; // No default reply
1888 }
1889
1890
1891 /*-------------------------------------------------------------------------*/
1892
1893 /* Sync the file data, don't bother with the metadata.
1894 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1895 static int fsync_sub(struct lun *curlun)
1896 {
1897 struct file *filp = curlun->filp;
1898 struct inode *inode;
1899 int rc, err;
1900
1901 if (curlun->ro || !filp)
1902 return 0;
1903 if (!filp->f_op->fsync)
1904 return -EINVAL;
1905
1906 inode = filp->f_dentry->d_inode;
1907 mutex_lock(&inode->i_mutex);
1908 rc = filemap_fdatawrite(inode->i_mapping);
1909 err = filp->f_op->fsync(filp, filp->f_dentry, 1);
1910 if (!rc)
1911 rc = err;
1912 err = filemap_fdatawait(inode->i_mapping);
1913 if (!rc)
1914 rc = err;
1915 mutex_unlock(&inode->i_mutex);
1916 VLDBG(curlun, "fdatasync -> %d\n", rc);
1917 return rc;
1918 }
1919
1920 static void fsync_all(struct fsg_dev *fsg)
1921 {
1922 int i;
1923
1924 for (i = 0; i < fsg->nluns; ++i)
1925 fsync_sub(&fsg->luns[i]);
1926 }
1927
1928 static int do_synchronize_cache(struct fsg_dev *fsg)
1929 {
1930 struct lun *curlun = fsg->curlun;
1931 int rc;
1932
1933 /* We ignore the requested LBA and write out all file's
1934 * dirty data buffers. */
1935 rc = fsync_sub(curlun);
1936 if (rc)
1937 curlun->sense_data = SS_WRITE_ERROR;
1938 return 0;
1939 }
1940
1941
1942 /*-------------------------------------------------------------------------*/
1943
1944 static void invalidate_sub(struct lun *curlun)
1945 {
1946 struct file *filp = curlun->filp;
1947 struct inode *inode = filp->f_dentry->d_inode;
1948 unsigned long rc;
1949
1950 rc = invalidate_inode_pages(inode->i_mapping);
1951 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1952 }
1953
1954 static int do_verify(struct fsg_dev *fsg)
1955 {
1956 struct lun *curlun = fsg->curlun;
1957 u32 lba;
1958 u32 verification_length;
1959 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1960 loff_t file_offset, file_offset_tmp;
1961 u32 amount_left;
1962 unsigned int amount;
1963 ssize_t nread;
1964
1965 /* Get the starting Logical Block Address and check that it's
1966 * not too big */
1967 lba = get_be32(&fsg->cmnd[2]);
1968 if (lba >= curlun->num_sectors) {
1969 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1970 return -EINVAL;
1971 }
1972
1973 /* We allow DPO (Disable Page Out = don't save data in the
1974 * cache) but we don't implement it. */
1975 if ((fsg->cmnd[1] & ~0x10) != 0) {
1976 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1977 return -EINVAL;
1978 }
1979
1980 verification_length = get_be16(&fsg->cmnd[7]);
1981 if (unlikely(verification_length == 0))
1982 return -EIO; // No default reply
1983
1984 /* Prepare to carry out the file verify */
1985 amount_left = verification_length << 9;
1986 file_offset = ((loff_t) lba) << 9;
1987
1988 /* Write out all the dirty buffers before invalidating them */
1989 fsync_sub(curlun);
1990 if (signal_pending(current))
1991 return -EINTR;
1992
1993 invalidate_sub(curlun);
1994 if (signal_pending(current))
1995 return -EINTR;
1996
1997 /* Just try to read the requested blocks */
1998 while (amount_left > 0) {
1999
2000 /* Figure out how much we need to read:
2001 * Try to read the remaining amount, but not more than
2002 * the buffer size.
2003 * And don't try to read past the end of the file.
2004 * If this means reading 0 then we were asked to read
2005 * past the end of file. */
2006 amount = min((unsigned int) amount_left, mod_data.buflen);
2007 amount = min((loff_t) amount,
2008 curlun->file_length - file_offset);
2009 if (amount == 0) {
2010 curlun->sense_data =
2011 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2012 curlun->sense_data_info = file_offset >> 9;
2013 break;
2014 }
2015
2016 /* Perform the read */
2017 file_offset_tmp = file_offset;
2018 nread = vfs_read(curlun->filp,
2019 (char __user *) bh->buf,
2020 amount, &file_offset_tmp);
2021 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
2022 (unsigned long long) file_offset,
2023 (int) nread);
2024 if (signal_pending(current))
2025 return -EINTR;
2026
2027 if (nread < 0) {
2028 LDBG(curlun, "error in file verify: %d\n",
2029 (int) nread);
2030 nread = 0;
2031 } else if (nread < amount) {
2032 LDBG(curlun, "partial file verify: %d/%u\n",
2033 (int) nread, amount);
2034 nread -= (nread & 511); // Round down to a sector
2035 }
2036 if (nread == 0) {
2037 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2038 curlun->sense_data_info = file_offset >> 9;
2039 break;
2040 }
2041 file_offset += nread;
2042 amount_left -= nread;
2043 }
2044 return 0;
2045 }
2046
2047
2048 /*-------------------------------------------------------------------------*/
2049
2050 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2051 {
2052 u8 *buf = (u8 *) bh->buf;
2053
2054 static char vendor_id[] = "Linux ";
2055 static char product_id[] = "File-Stor Gadget";
2056
2057 if (!fsg->curlun) { // Unsupported LUNs are okay
2058 fsg->bad_lun_okay = 1;
2059 memset(buf, 0, 36);
2060 buf[0] = 0x7f; // Unsupported, no device-type
2061 return 36;
2062 }
2063
2064 memset(buf, 0, 8); // Non-removable, direct-access device
2065 if (mod_data.removable)
2066 buf[1] = 0x80;
2067 buf[2] = 2; // ANSI SCSI level 2
2068 buf[3] = 2; // SCSI-2 INQUIRY data format
2069 buf[4] = 31; // Additional length
2070 // No special options
2071 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2072 mod_data.release);
2073 return 36;
2074 }
2075
2076
2077 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2078 {
2079 struct lun *curlun = fsg->curlun;
2080 u8 *buf = (u8 *) bh->buf;
2081 u32 sd, sdinfo;
2082
2083 /*
2084 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2085 *
2086 * If a REQUEST SENSE command is received from an initiator
2087 * with a pending unit attention condition (before the target
2088 * generates the contingent allegiance condition), then the
2089 * target shall either:
2090 * a) report any pending sense data and preserve the unit
2091 * attention condition on the logical unit, or,
2092 * b) report the unit attention condition, may discard any
2093 * pending sense data, and clear the unit attention
2094 * condition on the logical unit for that initiator.
2095 *
2096 * FSG normally uses option a); enable this code to use option b).
2097 */
2098 #if 0
2099 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2100 curlun->sense_data = curlun->unit_attention_data;
2101 curlun->unit_attention_data = SS_NO_SENSE;
2102 }
2103 #endif
2104
2105 if (!curlun) { // Unsupported LUNs are okay
2106 fsg->bad_lun_okay = 1;
2107 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2108 sdinfo = 0;
2109 } else {
2110 sd = curlun->sense_data;
2111 sdinfo = curlun->sense_data_info;
2112 curlun->sense_data = SS_NO_SENSE;
2113 curlun->sense_data_info = 0;
2114 }
2115
2116 memset(buf, 0, 18);
2117 buf[0] = 0x80 | 0x70; // Valid, current error
2118 buf[2] = SK(sd);
2119 put_be32(&buf[3], sdinfo); // Sense information
2120 buf[7] = 18 - 8; // Additional sense length
2121 buf[12] = ASC(sd);
2122 buf[13] = ASCQ(sd);
2123 return 18;
2124 }
2125
2126
2127 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2128 {
2129 struct lun *curlun = fsg->curlun;
2130 u32 lba = get_be32(&fsg->cmnd[2]);
2131 int pmi = fsg->cmnd[8];
2132 u8 *buf = (u8 *) bh->buf;
2133
2134 /* Check the PMI and LBA fields */
2135 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2136 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2137 return -EINVAL;
2138 }
2139
2140 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2141 put_be32(&buf[4], 512); // Block length
2142 return 8;
2143 }
2144
2145
2146 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2147 {
2148 struct lun *curlun = fsg->curlun;
2149 int mscmnd = fsg->cmnd[0];
2150 u8 *buf = (u8 *) bh->buf;
2151 u8 *buf0 = buf;
2152 int pc, page_code;
2153 int changeable_values, all_pages;
2154 int valid_page = 0;
2155 int len, limit;
2156
2157 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2158 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2159 return -EINVAL;
2160 }
2161 pc = fsg->cmnd[2] >> 6;
2162 page_code = fsg->cmnd[2] & 0x3f;
2163 if (pc == 3) {
2164 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2165 return -EINVAL;
2166 }
2167 changeable_values = (pc == 1);
2168 all_pages = (page_code == 0x3f);
2169
2170 /* Write the mode parameter header. Fixed values are: default
2171 * medium type, no cache control (DPOFUA), and no block descriptors.
2172 * The only variable value is the WriteProtect bit. We will fill in
2173 * the mode data length later. */
2174 memset(buf, 0, 8);
2175 if (mscmnd == SC_MODE_SENSE_6) {
2176 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2177 buf += 4;
2178 limit = 255;
2179 } else { // SC_MODE_SENSE_10
2180 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2181 buf += 8;
2182 limit = 65535; // Should really be mod_data.buflen
2183 }
2184
2185 /* No block descriptors */
2186
2187 /* The mode pages, in numerical order. The only page we support
2188 * is the Caching page. */
2189 if (page_code == 0x08 || all_pages) {
2190 valid_page = 1;
2191 buf[0] = 0x08; // Page code
2192 buf[1] = 10; // Page length
2193 memset(buf+2, 0, 10); // None of the fields are changeable
2194
2195 if (!changeable_values) {
2196 buf[2] = 0x04; // Write cache enable,
2197 // Read cache not disabled
2198 // No cache retention priorities
2199 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2200 // Minimum prefetch = 0
2201 put_be16(&buf[8], 0xffff); // Maximum prefetch
2202 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2203 }
2204 buf += 12;
2205 }
2206
2207 /* Check that a valid page was requested and the mode data length
2208 * isn't too long. */
2209 len = buf - buf0;
2210 if (!valid_page || len > limit) {
2211 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2212 return -EINVAL;
2213 }
2214
2215 /* Store the mode data length */
2216 if (mscmnd == SC_MODE_SENSE_6)
2217 buf0[0] = len - 1;
2218 else
2219 put_be16(buf0, len - 2);
2220 return len;
2221 }
2222
2223
2224 static int do_start_stop(struct fsg_dev *fsg)
2225 {
2226 struct lun *curlun = fsg->curlun;
2227 int loej, start;
2228
2229 if (!mod_data.removable) {
2230 curlun->sense_data = SS_INVALID_COMMAND;
2231 return -EINVAL;
2232 }
2233
2234 // int immed = fsg->cmnd[1] & 0x01;
2235 loej = fsg->cmnd[4] & 0x02;
2236 start = fsg->cmnd[4] & 0x01;
2237
2238 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2239 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2240 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2241 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2242 return -EINVAL;
2243 }
2244
2245 if (!start) {
2246
2247 /* Are we allowed to unload the media? */
2248 if (curlun->prevent_medium_removal) {
2249 LDBG(curlun, "unload attempt prevented\n");
2250 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2251 return -EINVAL;
2252 }
2253 if (loej) { // Simulate an unload/eject
2254 up_read(&fsg->filesem);
2255 down_write(&fsg->filesem);
2256 close_backing_file(curlun);
2257 up_write(&fsg->filesem);
2258 down_read(&fsg->filesem);
2259 }
2260 } else {
2261
2262 /* Our emulation doesn't support mounting; the medium is
2263 * available for use as soon as it is loaded. */
2264 if (!backing_file_is_open(curlun)) {
2265 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2266 return -EINVAL;
2267 }
2268 }
2269 #endif
2270 return 0;
2271 }
2272
2273
2274 static int do_prevent_allow(struct fsg_dev *fsg)
2275 {
2276 struct lun *curlun = fsg->curlun;
2277 int prevent;
2278
2279 if (!mod_data.removable) {
2280 curlun->sense_data = SS_INVALID_COMMAND;
2281 return -EINVAL;
2282 }
2283
2284 prevent = fsg->cmnd[4] & 0x01;
2285 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2286 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2287 return -EINVAL;
2288 }
2289
2290 if (curlun->prevent_medium_removal && !prevent)
2291 fsync_sub(curlun);
2292 curlun->prevent_medium_removal = prevent;
2293 return 0;
2294 }
2295
2296
2297 static int do_read_format_capacities(struct fsg_dev *fsg,
2298 struct fsg_buffhd *bh)
2299 {
2300 struct lun *curlun = fsg->curlun;
2301 u8 *buf = (u8 *) bh->buf;
2302
2303 buf[0] = buf[1] = buf[2] = 0;
2304 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2305 buf += 4;
2306
2307 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2308 put_be32(&buf[4], 512); // Block length
2309 buf[4] = 0x02; // Current capacity
2310 return 12;
2311 }
2312
2313
2314 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2315 {
2316 struct lun *curlun = fsg->curlun;
2317
2318 /* We don't support MODE SELECT */
2319 curlun->sense_data = SS_INVALID_COMMAND;
2320 return -EINVAL;
2321 }
2322
2323
2324 /*-------------------------------------------------------------------------*/
2325
2326 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2327 {
2328 int rc;
2329
2330 rc = fsg_set_halt(fsg, fsg->bulk_in);
2331 if (rc == -EAGAIN)
2332 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2333 while (rc != 0) {
2334 if (rc != -EAGAIN) {
2335 WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
2336 rc = 0;
2337 break;
2338 }
2339
2340 /* Wait for a short time and then try again */
2341 if (msleep_interruptible(100) != 0)
2342 return -EINTR;
2343 rc = usb_ep_set_halt(fsg->bulk_in);
2344 }
2345 return rc;
2346 }
2347
2348 static int pad_with_zeros(struct fsg_dev *fsg)
2349 {
2350 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2351 u32 nkeep = bh->inreq->length;
2352 u32 nsend;
2353 int rc;
2354
2355 bh->state = BUF_STATE_EMPTY; // For the first iteration
2356 fsg->usb_amount_left = nkeep + fsg->residue;
2357 while (fsg->usb_amount_left > 0) {
2358
2359 /* Wait for the next buffer to be free */
2360 while (bh->state != BUF_STATE_EMPTY) {
2361 if ((rc = sleep_thread(fsg)) != 0)
2362 return rc;
2363 }
2364
2365 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2366 memset(bh->buf + nkeep, 0, nsend - nkeep);
2367 bh->inreq->length = nsend;
2368 bh->inreq->zero = 0;
2369 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2370 &bh->inreq_busy, &bh->state);
2371 bh = fsg->next_buffhd_to_fill = bh->next;
2372 fsg->usb_amount_left -= nsend;
2373 nkeep = 0;
2374 }
2375 return 0;
2376 }
2377
2378 static int throw_away_data(struct fsg_dev *fsg)
2379 {
2380 struct fsg_buffhd *bh;
2381 u32 amount;
2382 int rc;
2383
2384 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2385 fsg->usb_amount_left > 0) {
2386
2387 /* Throw away the data in a filled buffer */
2388 if (bh->state == BUF_STATE_FULL) {
2389 smp_rmb();
2390 bh->state = BUF_STATE_EMPTY;
2391 fsg->next_buffhd_to_drain = bh->next;
2392
2393 /* A short packet or an error ends everything */
2394 if (bh->outreq->actual != bh->outreq->length ||
2395 bh->outreq->status != 0) {
2396 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2397 return -EINTR;
2398 }
2399 continue;
2400 }
2401
2402 /* Try to submit another request if we need one */
2403 bh = fsg->next_buffhd_to_fill;
2404 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2405 amount = min(fsg->usb_amount_left,
2406 (u32) mod_data.buflen);
2407
2408 /* amount is always divisible by 512, hence by
2409 * the bulk-out maxpacket size */
2410 bh->outreq->length = bh->bulk_out_intended_length =
2411 amount;
2412 bh->outreq->short_not_ok = 1;
2413 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2414 &bh->outreq_busy, &bh->state);
2415 fsg->next_buffhd_to_fill = bh->next;
2416 fsg->usb_amount_left -= amount;
2417 continue;
2418 }
2419
2420 /* Otherwise wait for something to happen */
2421 if ((rc = sleep_thread(fsg)) != 0)
2422 return rc;
2423 }
2424 return 0;
2425 }
2426
2427
2428 static int finish_reply(struct fsg_dev *fsg)
2429 {
2430 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2431 int rc = 0;
2432
2433 switch (fsg->data_dir) {
2434 case DATA_DIR_NONE:
2435 break; // Nothing to send
2436
2437 /* If we don't know whether the host wants to read or write,
2438 * this must be CB or CBI with an unknown command. We mustn't
2439 * try to send or receive any data. So stall both bulk pipes
2440 * if we can and wait for a reset. */
2441 case DATA_DIR_UNKNOWN:
2442 if (mod_data.can_stall) {
2443 fsg_set_halt(fsg, fsg->bulk_out);
2444 rc = halt_bulk_in_endpoint(fsg);
2445 }
2446 break;
2447
2448 /* All but the last buffer of data must have already been sent */
2449 case DATA_DIR_TO_HOST:
2450 if (fsg->data_size == 0)
2451 ; // Nothing to send
2452
2453 /* If there's no residue, simply send the last buffer */
2454 else if (fsg->residue == 0) {
2455 bh->inreq->zero = 0;
2456 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2457 &bh->inreq_busy, &bh->state);
2458 fsg->next_buffhd_to_fill = bh->next;
2459 }
2460
2461 /* There is a residue. For CB and CBI, simply mark the end
2462 * of the data with a short packet. However, if we are
2463 * allowed to stall, there was no data at all (residue ==
2464 * data_size), and the command failed (invalid LUN or
2465 * sense data is set), then halt the bulk-in endpoint
2466 * instead. */
2467 else if (!transport_is_bbb()) {
2468 if (mod_data.can_stall &&
2469 fsg->residue == fsg->data_size &&
2470 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2471 bh->state = BUF_STATE_EMPTY;
2472 rc = halt_bulk_in_endpoint(fsg);
2473 } else {
2474 bh->inreq->zero = 1;
2475 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2476 &bh->inreq_busy, &bh->state);
2477 fsg->next_buffhd_to_fill = bh->next;
2478 }
2479 }
2480
2481 /* For Bulk-only, if we're allowed to stall then send the
2482 * short packet and halt the bulk-in endpoint. If we can't
2483 * stall, pad out the remaining data with 0's. */
2484 else {
2485 if (mod_data.can_stall) {
2486 bh->inreq->zero = 1;
2487 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2488 &bh->inreq_busy, &bh->state);
2489 fsg->next_buffhd_to_fill = bh->next;
2490 rc = halt_bulk_in_endpoint(fsg);
2491 } else
2492 rc = pad_with_zeros(fsg);
2493 }
2494 break;
2495
2496 /* We have processed all we want from the data the host has sent.
2497 * There may still be outstanding bulk-out requests. */
2498 case DATA_DIR_FROM_HOST:
2499 if (fsg->residue == 0)
2500 ; // Nothing to receive
2501
2502 /* Did the host stop sending unexpectedly early? */
2503 else if (fsg->short_packet_received) {
2504 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2505 rc = -EINTR;
2506 }
2507
2508 /* We haven't processed all the incoming data. Even though
2509 * we may be allowed to stall, doing so would cause a race.
2510 * The controller may already have ACK'ed all the remaining
2511 * bulk-out packets, in which case the host wouldn't see a
2512 * STALL. Not realizing the endpoint was halted, it wouldn't
2513 * clear the halt -- leading to problems later on. */
2514 #if 0
2515 else if (mod_data.can_stall) {
2516 fsg_set_halt(fsg, fsg->bulk_out);
2517 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2518 rc = -EINTR;
2519 }
2520 #endif
2521
2522 /* We can't stall. Read in the excess data and throw it
2523 * all away. */
2524 else
2525 rc = throw_away_data(fsg);
2526 break;
2527 }
2528 return rc;
2529 }
2530
2531
2532 static int send_status(struct fsg_dev *fsg)
2533 {
2534 struct lun *curlun = fsg->curlun;
2535 struct fsg_buffhd *bh;
2536 int rc;
2537 u8 status = USB_STATUS_PASS;
2538 u32 sd, sdinfo = 0;
2539
2540 /* Wait for the next buffer to become available */
2541 bh = fsg->next_buffhd_to_fill;
2542 while (bh->state != BUF_STATE_EMPTY) {
2543 if ((rc = sleep_thread(fsg)) != 0)
2544 return rc;
2545 }
2546
2547 if (curlun) {
2548 sd = curlun->sense_data;
2549 sdinfo = curlun->sense_data_info;
2550 } else if (fsg->bad_lun_okay)
2551 sd = SS_NO_SENSE;
2552 else
2553 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2554
2555 if (fsg->phase_error) {
2556 DBG(fsg, "sending phase-error status\n");
2557 status = USB_STATUS_PHASE_ERROR;
2558 sd = SS_INVALID_COMMAND;
2559 } else if (sd != SS_NO_SENSE) {
2560 DBG(fsg, "sending command-failure status\n");
2561 status = USB_STATUS_FAIL;
2562 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2563 " info x%x\n",
2564 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2565 }
2566
2567 if (transport_is_bbb()) {
2568 struct bulk_cs_wrap *csw = (struct bulk_cs_wrap *) bh->buf;
2569
2570 /* Store and send the Bulk-only CSW */
2571 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2572 csw->Tag = fsg->tag;
2573 csw->Residue = cpu_to_le32(fsg->residue);
2574 csw->Status = status;
2575
2576 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2577 bh->inreq->zero = 0;
2578 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2579 &bh->inreq_busy, &bh->state);
2580
2581 } else if (mod_data.transport_type == USB_PR_CB) {
2582
2583 /* Control-Bulk transport has no status phase! */
2584 return 0;
2585
2586 } else { // USB_PR_CBI
2587 struct interrupt_data *buf = (struct interrupt_data *)
2588 bh->buf;
2589
2590 /* Store and send the Interrupt data. UFI sends the ASC
2591 * and ASCQ bytes. Everything else sends a Type (which
2592 * is always 0) and the status Value. */
2593 if (mod_data.protocol_type == USB_SC_UFI) {
2594 buf->bType = ASC(sd);
2595 buf->bValue = ASCQ(sd);
2596 } else {
2597 buf->bType = 0;
2598 buf->bValue = status;
2599 }
2600 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2601
2602 fsg->intr_buffhd = bh; // Point to the right buffhd
2603 fsg->intreq->buf = bh->inreq->buf;
2604 fsg->intreq->dma = bh->inreq->dma;
2605 fsg->intreq->context = bh;
2606 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2607 &fsg->intreq_busy, &bh->state);
2608 }
2609
2610 fsg->next_buffhd_to_fill = bh->next;
2611 return 0;
2612 }
2613
2614
2615 /*-------------------------------------------------------------------------*/
2616
2617 /* Check whether the command is properly formed and whether its data size
2618 * and direction agree with the values we already have. */
2619 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2620 enum data_direction data_dir, unsigned int mask,
2621 int needs_medium, const char *name)
2622 {
2623 int i;
2624 int lun = fsg->cmnd[1] >> 5;
2625 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2626 char hdlen[20];
2627 struct lun *curlun;
2628
2629 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2630 * Transparent SCSI doesn't pad. */
2631 if (protocol_is_scsi())
2632 ;
2633
2634 /* There's some disagreement as to whether RBC pads commands or not.
2635 * We'll play it safe and accept either form. */
2636 else if (mod_data.protocol_type == USB_SC_RBC) {
2637 if (fsg->cmnd_size == 12)
2638 cmnd_size = 12;
2639
2640 /* All the other protocols pad to 12 bytes */
2641 } else
2642 cmnd_size = 12;
2643
2644 hdlen[0] = 0;
2645 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2646 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2647 fsg->data_size);
2648 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2649 name, cmnd_size, dirletter[(int) data_dir],
2650 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2651
2652 /* We can't reply at all until we know the correct data direction
2653 * and size. */
2654 if (fsg->data_size_from_cmnd == 0)
2655 data_dir = DATA_DIR_NONE;
2656 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2657 fsg->data_dir = data_dir;
2658 fsg->data_size = fsg->data_size_from_cmnd;
2659
2660 } else { // Bulk-only
2661 if (fsg->data_size < fsg->data_size_from_cmnd) {
2662
2663 /* Host data size < Device data size is a phase error.
2664 * Carry out the command, but only transfer as much
2665 * as we are allowed. */
2666 fsg->data_size_from_cmnd = fsg->data_size;
2667 fsg->phase_error = 1;
2668 }
2669 }
2670 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2671
2672 /* Conflicting data directions is a phase error */
2673 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2674 fsg->phase_error = 1;
2675 return -EINVAL;
2676 }
2677
2678 /* Verify the length of the command itself */
2679 if (cmnd_size != fsg->cmnd_size) {
2680
2681 /* Special case workaround: MS-Windows issues REQUEST SENSE
2682 * with cbw->Length == 12 (it should be 6). */
2683 if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2684 cmnd_size = fsg->cmnd_size;
2685 else {
2686 fsg->phase_error = 1;
2687 return -EINVAL;
2688 }
2689 }
2690
2691 /* Check that the LUN values are consistent */
2692 if (transport_is_bbb()) {
2693 if (fsg->lun != lun)
2694 DBG(fsg, "using LUN %d from CBW, "
2695 "not LUN %d from CDB\n",
2696 fsg->lun, lun);
2697 } else
2698 fsg->lun = lun; // Use LUN from the command
2699
2700 /* Check the LUN */
2701 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2702 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2703 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2704 curlun->sense_data = SS_NO_SENSE;
2705 curlun->sense_data_info = 0;
2706 }
2707 } else {
2708 fsg->curlun = curlun = NULL;
2709 fsg->bad_lun_okay = 0;
2710
2711 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2712 * to use unsupported LUNs; all others may not. */
2713 if (fsg->cmnd[0] != SC_INQUIRY &&
2714 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2715 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2716 return -EINVAL;
2717 }
2718 }
2719
2720 /* If a unit attention condition exists, only INQUIRY and
2721 * REQUEST SENSE commands are allowed; anything else must fail. */
2722 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2723 fsg->cmnd[0] != SC_INQUIRY &&
2724 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2725 curlun->sense_data = curlun->unit_attention_data;
2726 curlun->unit_attention_data = SS_NO_SENSE;
2727 return -EINVAL;
2728 }
2729
2730 /* Check that only command bytes listed in the mask are non-zero */
2731 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2732 for (i = 1; i < cmnd_size; ++i) {
2733 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2734 if (curlun)
2735 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2736 return -EINVAL;
2737 }
2738 }
2739
2740 /* If the medium isn't mounted and the command needs to access
2741 * it, return an error. */
2742 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2743 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2744 return -EINVAL;
2745 }
2746
2747 return 0;
2748 }
2749
2750
2751 static int do_scsi_command(struct fsg_dev *fsg)
2752 {
2753 struct fsg_buffhd *bh;
2754 int rc;
2755 int reply = -EINVAL;
2756 int i;
2757 static char unknown[16];
2758
2759 dump_cdb(fsg);
2760
2761 /* Wait for the next buffer to become available for data or status */
2762 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2763 while (bh->state != BUF_STATE_EMPTY) {
2764 if ((rc = sleep_thread(fsg)) != 0)
2765 return rc;
2766 }
2767 fsg->phase_error = 0;
2768 fsg->short_packet_received = 0;
2769
2770 down_read(&fsg->filesem); // We're using the backing file
2771 switch (fsg->cmnd[0]) {
2772
2773 case SC_INQUIRY:
2774 fsg->data_size_from_cmnd = fsg->cmnd[4];
2775 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2776 (1<<4), 0,
2777 "INQUIRY")) == 0)
2778 reply = do_inquiry(fsg, bh);
2779 break;
2780
2781 case SC_MODE_SELECT_6:
2782 fsg->data_size_from_cmnd = fsg->cmnd[4];
2783 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2784 (1<<1) | (1<<4), 0,
2785 "MODE SELECT(6)")) == 0)
2786 reply = do_mode_select(fsg, bh);
2787 break;
2788
2789 case SC_MODE_SELECT_10:
2790 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2791 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2792 (1<<1) | (3<<7), 0,
2793 "MODE SELECT(10)")) == 0)
2794 reply = do_mode_select(fsg, bh);
2795 break;
2796
2797 case SC_MODE_SENSE_6:
2798 fsg->data_size_from_cmnd = fsg->cmnd[4];
2799 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2800 (1<<1) | (1<<2) | (1<<4), 0,
2801 "MODE SENSE(6)")) == 0)
2802 reply = do_mode_sense(fsg, bh);
2803 break;
2804
2805 case SC_MODE_SENSE_10:
2806 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2807 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2808 (1<<1) | (1<<2) | (3<<7), 0,
2809 "MODE SENSE(10)")) == 0)
2810 reply = do_mode_sense(fsg, bh);
2811 break;
2812
2813 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2814 fsg->data_size_from_cmnd = 0;
2815 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2816 (1<<4), 0,
2817 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2818 reply = do_prevent_allow(fsg);
2819 break;
2820
2821 case SC_READ_6:
2822 i = fsg->cmnd[4];
2823 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2824 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2825 (7<<1) | (1<<4), 1,
2826 "READ(6)")) == 0)
2827 reply = do_read(fsg);
2828 break;
2829
2830 case SC_READ_10:
2831 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2832 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2833 (1<<1) | (0xf<<2) | (3<<7), 1,
2834 "READ(10)")) == 0)
2835 reply = do_read(fsg);
2836 break;
2837
2838 case SC_READ_12:
2839 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2840 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2841 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2842 "READ(12)")) == 0)
2843 reply = do_read(fsg);
2844 break;
2845
2846 case SC_READ_CAPACITY:
2847 fsg->data_size_from_cmnd = 8;
2848 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2849 (0xf<<2) | (1<<8), 1,
2850 "READ CAPACITY")) == 0)
2851 reply = do_read_capacity(fsg, bh);
2852 break;
2853
2854 case SC_READ_FORMAT_CAPACITIES:
2855 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2856 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2857 (3<<7), 1,
2858 "READ FORMAT CAPACITIES")) == 0)
2859 reply = do_read_format_capacities(fsg, bh);
2860 break;
2861
2862 case SC_REQUEST_SENSE:
2863 fsg->data_size_from_cmnd = fsg->cmnd[4];
2864 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2865 (1<<4), 0,
2866 "REQUEST SENSE")) == 0)
2867 reply = do_request_sense(fsg, bh);
2868 break;
2869
2870 case SC_START_STOP_UNIT:
2871 fsg->data_size_from_cmnd = 0;
2872 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2873 (1<<1) | (1<<4), 0,
2874 "START-STOP UNIT")) == 0)
2875 reply = do_start_stop(fsg);
2876 break;
2877
2878 case SC_SYNCHRONIZE_CACHE:
2879 fsg->data_size_from_cmnd = 0;
2880 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2881 (0xf<<2) | (3<<7), 1,
2882 "SYNCHRONIZE CACHE")) == 0)
2883 reply = do_synchronize_cache(fsg);
2884 break;
2885
2886 case SC_TEST_UNIT_READY:
2887 fsg->data_size_from_cmnd = 0;
2888 reply = check_command(fsg, 6, DATA_DIR_NONE,
2889 0, 1,
2890 "TEST UNIT READY");
2891 break;
2892
2893 /* Although optional, this command is used by MS-Windows. We
2894 * support a minimal version: BytChk must be 0. */
2895 case SC_VERIFY:
2896 fsg->data_size_from_cmnd = 0;
2897 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2898 (1<<1) | (0xf<<2) | (3<<7), 1,
2899 "VERIFY")) == 0)
2900 reply = do_verify(fsg);
2901 break;
2902
2903 case SC_WRITE_6:
2904 i = fsg->cmnd[4];
2905 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2906 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2907 (7<<1) | (1<<4), 1,
2908 "WRITE(6)")) == 0)
2909 reply = do_write(fsg);
2910 break;
2911
2912 case SC_WRITE_10:
2913 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2914 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2915 (1<<1) | (0xf<<2) | (3<<7), 1,
2916 "WRITE(10)")) == 0)
2917 reply = do_write(fsg);
2918 break;
2919
2920 case SC_WRITE_12:
2921 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2922 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2923 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2924 "WRITE(12)")) == 0)
2925 reply = do_write(fsg);
2926 break;
2927
2928 /* Some mandatory commands that we recognize but don't implement.
2929 * They don't mean much in this setting. It's left as an exercise
2930 * for anyone interested to implement RESERVE and RELEASE in terms
2931 * of Posix locks. */
2932 case SC_FORMAT_UNIT:
2933 case SC_RELEASE:
2934 case SC_RESERVE:
2935 case SC_SEND_DIAGNOSTIC:
2936 // Fall through
2937
2938 default:
2939 fsg->data_size_from_cmnd = 0;
2940 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2941 if ((reply = check_command(fsg, fsg->cmnd_size,
2942 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2943 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2944 reply = -EINVAL;
2945 }
2946 break;
2947 }
2948 up_read(&fsg->filesem);
2949
2950 if (reply == -EINTR || signal_pending(current))
2951 return -EINTR;
2952
2953 /* Set up the single reply buffer for finish_reply() */
2954 if (reply == -EINVAL)
2955 reply = 0; // Error reply length
2956 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2957 reply = min((u32) reply, fsg->data_size_from_cmnd);
2958 bh->inreq->length = reply;
2959 bh->state = BUF_STATE_FULL;
2960 fsg->residue -= reply;
2961 } // Otherwise it's already set
2962
2963 return 0;
2964 }
2965
2966
2967 /*-------------------------------------------------------------------------*/
2968
2969 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2970 {
2971 struct usb_request *req = bh->outreq;
2972 struct bulk_cb_wrap *cbw = (struct bulk_cb_wrap *) req->buf;
2973
2974 /* Was this a real packet? */
2975 if (req->status)
2976 return -EINVAL;
2977
2978 /* Is the CBW valid? */
2979 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2980 cbw->Signature != __constant_cpu_to_le32(
2981 USB_BULK_CB_SIG)) {
2982 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2983 req->actual,
2984 le32_to_cpu(cbw->Signature));
2985
2986 /* The Bulk-only spec says we MUST stall the bulk pipes!
2987 * If we want to avoid stalls, set a flag so that we will
2988 * clear the endpoint halts at the next reset. */
2989 if (!mod_data.can_stall)
2990 set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
2991 fsg_set_halt(fsg, fsg->bulk_out);
2992 halt_bulk_in_endpoint(fsg);
2993 return -EINVAL;
2994 }
2995
2996 /* Is the CBW meaningful? */
2997 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
2998 cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
2999 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
3000 "cmdlen %u\n",
3001 cbw->Lun, cbw->Flags, cbw->Length);
3002
3003 /* We can do anything we want here, so let's stall the
3004 * bulk pipes if we are allowed to. */
3005 if (mod_data.can_stall) {
3006 fsg_set_halt(fsg, fsg->bulk_out);
3007 halt_bulk_in_endpoint(fsg);
3008 }
3009 return -EINVAL;
3010 }
3011
3012 /* Save the command for later */
3013 fsg->cmnd_size = cbw->Length;
3014 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
3015 if (cbw->Flags & USB_BULK_IN_FLAG)
3016 fsg->data_dir = DATA_DIR_TO_HOST;
3017 else
3018 fsg->data_dir = DATA_DIR_FROM_HOST;
3019 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
3020 if (fsg->data_size == 0)
3021 fsg->data_dir = DATA_DIR_NONE;
3022 fsg->lun = cbw->Lun;
3023 fsg->tag = cbw->Tag;
3024 return 0;
3025 }
3026
3027
3028 static int get_next_command(struct fsg_dev *fsg)
3029 {
3030 struct fsg_buffhd *bh;
3031 int rc = 0;
3032
3033 if (transport_is_bbb()) {
3034
3035 /* Wait for the next buffer to become available */
3036 bh = fsg->next_buffhd_to_fill;
3037 while (bh->state != BUF_STATE_EMPTY) {
3038 if ((rc = sleep_thread(fsg)) != 0)
3039 return rc;
3040 }
3041
3042 /* Queue a request to read a Bulk-only CBW */
3043 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3044 bh->outreq->short_not_ok = 1;
3045 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3046 &bh->outreq_busy, &bh->state);
3047
3048 /* We will drain the buffer in software, which means we
3049 * can reuse it for the next filling. No need to advance
3050 * next_buffhd_to_fill. */
3051
3052 /* Wait for the CBW to arrive */
3053 while (bh->state != BUF_STATE_FULL) {
3054 if ((rc = sleep_thread(fsg)) != 0)
3055 return rc;
3056 }
3057 smp_rmb();
3058 rc = received_cbw(fsg, bh);
3059 bh->state = BUF_STATE_EMPTY;
3060
3061 } else { // USB_PR_CB or USB_PR_CBI
3062
3063 /* Wait for the next command to arrive */
3064 while (fsg->cbbuf_cmnd_size == 0) {
3065 if ((rc = sleep_thread(fsg)) != 0)
3066 return rc;
3067 }
3068
3069 /* Is the previous status interrupt request still busy?
3070 * The host is allowed to skip reading the status,
3071 * so we must cancel it. */
3072 if (fsg->intreq_busy)
3073 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3074
3075 /* Copy the command and mark the buffer empty */
3076 fsg->data_dir = DATA_DIR_UNKNOWN;
3077 spin_lock_irq(&fsg->lock);
3078 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3079 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3080 fsg->cbbuf_cmnd_size = 0;
3081 spin_unlock_irq(&fsg->lock);
3082 }
3083 return rc;
3084 }
3085
3086
3087 /*-------------------------------------------------------------------------*/
3088
3089 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3090 const struct usb_endpoint_descriptor *d)
3091 {
3092 int rc;
3093
3094 ep->driver_data = fsg;
3095 rc = usb_ep_enable(ep, d);
3096 if (rc)
3097 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3098 return rc;
3099 }
3100
3101 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3102 struct usb_request **preq)
3103 {
3104 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3105 if (*preq)
3106 return 0;
3107 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3108 return -ENOMEM;
3109 }
3110
3111 /*
3112 * Reset interface setting and re-init endpoint state (toggle etc).
3113 * Call with altsetting < 0 to disable the interface. The only other
3114 * available altsetting is 0, which enables the interface.
3115 */
3116 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3117 {
3118 int rc = 0;
3119 int i;
3120 const struct usb_endpoint_descriptor *d;
3121
3122 if (fsg->running)
3123 DBG(fsg, "reset interface\n");
3124
3125 reset:
3126 /* Deallocate the requests */
3127 for (i = 0; i < NUM_BUFFERS; ++i) {
3128 struct fsg_buffhd *bh = &fsg->buffhds[i];
3129
3130 if (bh->inreq) {
3131 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3132 bh->inreq = NULL;
3133 }
3134 if (bh->outreq) {
3135 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3136 bh->outreq = NULL;
3137 }
3138 }
3139 if (fsg->intreq) {
3140 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3141 fsg->intreq = NULL;
3142 }
3143
3144 /* Disable the endpoints */
3145 if (fsg->bulk_in_enabled) {
3146 usb_ep_disable(fsg->bulk_in);
3147 fsg->bulk_in_enabled = 0;
3148 }
3149 if (fsg->bulk_out_enabled) {
3150 usb_ep_disable(fsg->bulk_out);
3151 fsg->bulk_out_enabled = 0;
3152 }
3153 if (fsg->intr_in_enabled) {
3154 usb_ep_disable(fsg->intr_in);
3155 fsg->intr_in_enabled = 0;
3156 }
3157
3158 fsg->running = 0;
3159 if (altsetting < 0 || rc != 0)
3160 return rc;
3161
3162 DBG(fsg, "set interface %d\n", altsetting);
3163
3164 /* Enable the endpoints */
3165 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3166 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3167 goto reset;
3168 fsg->bulk_in_enabled = 1;
3169
3170 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3171 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3172 goto reset;
3173 fsg->bulk_out_enabled = 1;
3174 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3175
3176 if (transport_is_cbi()) {
3177 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3178 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3179 goto reset;
3180 fsg->intr_in_enabled = 1;
3181 }
3182
3183 /* Allocate the requests */
3184 for (i = 0; i < NUM_BUFFERS; ++i) {
3185 struct fsg_buffhd *bh = &fsg->buffhds[i];
3186
3187 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3188 goto reset;
3189 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3190 goto reset;
3191 bh->inreq->buf = bh->outreq->buf = bh->buf;
3192 bh->inreq->dma = bh->outreq->dma = bh->dma;
3193 bh->inreq->context = bh->outreq->context = bh;
3194 bh->inreq->complete = bulk_in_complete;
3195 bh->outreq->complete = bulk_out_complete;
3196 }
3197 if (transport_is_cbi()) {
3198 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3199 goto reset;
3200 fsg->intreq->complete = intr_in_complete;
3201 }
3202
3203 fsg->running = 1;
3204 for (i = 0; i < fsg->nluns; ++i)
3205 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3206 return rc;
3207 }
3208
3209
3210 /*
3211 * Change our operational configuration. This code must agree with the code
3212 * that returns config descriptors, and with interface altsetting code.
3213 *
3214 * It's also responsible for power management interactions. Some
3215 * configurations might not work with our current power sources.
3216 * For now we just assume the gadget is always self-powered.
3217 */
3218 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3219 {
3220 int rc = 0;
3221
3222 /* Disable the single interface */
3223 if (fsg->config != 0) {
3224 DBG(fsg, "reset config\n");
3225 fsg->config = 0;
3226 rc = do_set_interface(fsg, -1);
3227 }
3228
3229 /* Enable the interface */
3230 if (new_config != 0) {
3231 fsg->config = new_config;
3232 if ((rc = do_set_interface(fsg, 0)) != 0)
3233 fsg->config = 0; // Reset on errors
3234 else {
3235 char *speed;
3236
3237 switch (fsg->gadget->speed) {
3238 case USB_SPEED_LOW: speed = "low"; break;
3239 case USB_SPEED_FULL: speed = "full"; break;
3240 case USB_SPEED_HIGH: speed = "high"; break;
3241 default: speed = "?"; break;
3242 }
3243 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3244 }
3245 }
3246 return rc;
3247 }
3248
3249
3250 /*-------------------------------------------------------------------------*/
3251
3252 static void handle_exception(struct fsg_dev *fsg)
3253 {
3254 siginfo_t info;
3255 int sig;
3256 int i;
3257 int num_active;
3258 struct fsg_buffhd *bh;
3259 enum fsg_state old_state;
3260 u8 new_config;
3261 struct lun *curlun;
3262 unsigned int exception_req_tag;
3263 int rc;
3264
3265 /* Clear the existing signals. Anything but SIGUSR1 is converted
3266 * into a high-priority EXIT exception. */
3267 for (;;) {
3268 sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
3269 &info);
3270 if (!sig)
3271 break;
3272 if (sig != SIGUSR1) {
3273 if (fsg->state < FSG_STATE_EXIT)
3274 DBG(fsg, "Main thread exiting on signal\n");
3275 raise_exception(fsg, FSG_STATE_EXIT);
3276 }
3277 }
3278
3279 /* Cancel all the pending transfers */
3280 if (fsg->intreq_busy)
3281 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3282 for (i = 0; i < NUM_BUFFERS; ++i) {
3283 bh = &fsg->buffhds[i];
3284 if (bh->inreq_busy)
3285 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3286 if (bh->outreq_busy)
3287 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3288 }
3289
3290 /* Wait until everything is idle */
3291 for (;;) {
3292 num_active = fsg->intreq_busy;
3293 for (i = 0; i < NUM_BUFFERS; ++i) {
3294 bh = &fsg->buffhds[i];
3295 num_active += bh->inreq_busy + bh->outreq_busy;
3296 }
3297 if (num_active == 0)
3298 break;
3299 if (sleep_thread(fsg))
3300 return;
3301 }
3302
3303 /* Clear out the controller's fifos */
3304 if (fsg->bulk_in_enabled)
3305 usb_ep_fifo_flush(fsg->bulk_in);
3306 if (fsg->bulk_out_enabled)
3307 usb_ep_fifo_flush(fsg->bulk_out);
3308 if (fsg->intr_in_enabled)
3309 usb_ep_fifo_flush(fsg->intr_in);
3310
3311 /* Reset the I/O buffer states and pointers, the SCSI
3312 * state, and the exception. Then invoke the handler. */
3313 spin_lock_irq(&fsg->lock);
3314
3315 for (i = 0; i < NUM_BUFFERS; ++i) {
3316 bh = &fsg->buffhds[i];
3317 bh->state = BUF_STATE_EMPTY;
3318 }
3319 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3320 &fsg->buffhds[0];
3321
3322 exception_req_tag = fsg->exception_req_tag;
3323 new_config = fsg->new_config;
3324 old_state = fsg->state;
3325
3326 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3327 fsg->state = FSG_STATE_STATUS_PHASE;
3328 else {
3329 for (i = 0; i < fsg->nluns; ++i) {
3330 curlun = &fsg->luns[i];
3331 curlun->prevent_medium_removal = 0;
3332 curlun->sense_data = curlun->unit_attention_data =
3333 SS_NO_SENSE;
3334 curlun->sense_data_info = 0;
3335 }
3336 fsg->state = FSG_STATE_IDLE;
3337 }
3338 spin_unlock_irq(&fsg->lock);
3339
3340 /* Carry out any extra actions required for the exception */
3341 switch (old_state) {
3342 default:
3343 break;
3344
3345 case FSG_STATE_ABORT_BULK_OUT:
3346 send_status(fsg);
3347 spin_lock_irq(&fsg->lock);
3348 if (fsg->state == FSG_STATE_STATUS_PHASE)
3349 fsg->state = FSG_STATE_IDLE;
3350 spin_unlock_irq(&fsg->lock);
3351 break;
3352
3353 case FSG_STATE_RESET:
3354 /* In case we were forced against our will to halt a
3355 * bulk endpoint, clear the halt now. (The SuperH UDC
3356 * requires this.) */
3357 if (test_and_clear_bit(CLEAR_BULK_HALTS,
3358 &fsg->atomic_bitflags)) {
3359 usb_ep_clear_halt(fsg->bulk_in);
3360 usb_ep_clear_halt(fsg->bulk_out);
3361 }
3362
3363 if (transport_is_bbb()) {
3364 if (fsg->ep0_req_tag == exception_req_tag)
3365 ep0_queue(fsg); // Complete the status stage
3366
3367 } else if (transport_is_cbi())
3368 send_status(fsg); // Status by interrupt pipe
3369
3370 /* Technically this should go here, but it would only be
3371 * a waste of time. Ditto for the INTERFACE_CHANGE and
3372 * CONFIG_CHANGE cases. */
3373 // for (i = 0; i < fsg->nluns; ++i)
3374 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3375 break;
3376
3377 case FSG_STATE_INTERFACE_CHANGE:
3378 rc = do_set_interface(fsg, 0);
3379 if (fsg->ep0_req_tag != exception_req_tag)
3380 break;
3381 if (rc != 0) // STALL on errors
3382 fsg_set_halt(fsg, fsg->ep0);
3383 else // Complete the status stage
3384 ep0_queue(fsg);
3385 break;
3386
3387 case FSG_STATE_CONFIG_CHANGE:
3388 rc = do_set_config(fsg, new_config);
3389 if (fsg->ep0_req_tag != exception_req_tag)
3390 break;
3391 if (rc != 0) // STALL on errors
3392 fsg_set_halt(fsg, fsg->ep0);
3393 else // Complete the status stage
3394 ep0_queue(fsg);
3395 break;
3396
3397 case FSG_STATE_DISCONNECT:
3398 fsync_all(fsg);
3399 do_set_config(fsg, 0); // Unconfigured state
3400 break;
3401
3402 case FSG_STATE_EXIT:
3403 case FSG_STATE_TERMINATED:
3404 do_set_config(fsg, 0); // Free resources
3405 spin_lock_irq(&fsg->lock);
3406 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3407 spin_unlock_irq(&fsg->lock);
3408 break;
3409 }
3410 }
3411
3412
3413 /*-------------------------------------------------------------------------*/
3414
3415 static int fsg_main_thread(void *fsg_)
3416 {
3417 struct fsg_dev *fsg = (struct fsg_dev *) fsg_;
3418
3419 /* Allow the thread to be killed by a signal, but set the signal mask
3420 * to block everything but INT, TERM, KILL, and USR1. */
3421 siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
3422 sigmask(SIGTERM) | sigmask(SIGKILL) |
3423 sigmask(SIGUSR1));
3424 sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
3425
3426 /* Arrange for userspace references to be interpreted as kernel
3427 * pointers. That way we can pass a kernel pointer to a routine
3428 * that expects a __user pointer and it will work okay. */
3429 set_fs(get_ds());
3430
3431 /* The main loop */
3432 while (fsg->state != FSG_STATE_TERMINATED) {
3433 if (exception_in_progress(fsg) || signal_pending(current)) {
3434 handle_exception(fsg);
3435 continue;
3436 }
3437
3438 if (!fsg->running) {
3439 sleep_thread(fsg);
3440 continue;
3441 }
3442
3443 if (get_next_command(fsg))
3444 continue;
3445
3446 spin_lock_irq(&fsg->lock);
3447 if (!exception_in_progress(fsg))
3448 fsg->state = FSG_STATE_DATA_PHASE;
3449 spin_unlock_irq(&fsg->lock);
3450
3451 if (do_scsi_command(fsg) || finish_reply(fsg))
3452 continue;
3453
3454 spin_lock_irq(&fsg->lock);
3455 if (!exception_in_progress(fsg))
3456 fsg->state = FSG_STATE_STATUS_PHASE;
3457 spin_unlock_irq(&fsg->lock);
3458
3459 if (send_status(fsg))
3460 continue;
3461
3462 spin_lock_irq(&fsg->lock);
3463 if (!exception_in_progress(fsg))
3464 fsg->state = FSG_STATE_IDLE;
3465 spin_unlock_irq(&fsg->lock);
3466 }
3467
3468 spin_lock_irq(&fsg->lock);
3469 fsg->thread_task = NULL;
3470 spin_unlock_irq(&fsg->lock);
3471
3472 /* In case we are exiting because of a signal, unregister the
3473 * gadget driver and close the backing file. */
3474 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3475 usb_gadget_unregister_driver(&fsg_driver);
3476 close_all_backing_files(fsg);
3477 }
3478
3479 /* Let the unbind and cleanup routines know the thread has exited */
3480 complete_and_exit(&fsg->thread_notifier, 0);
3481 }
3482
3483
3484 /*-------------------------------------------------------------------------*/
3485
3486 /* If the next two routines are called while the gadget is registered,
3487 * the caller must own fsg->filesem for writing. */
3488
3489 static int open_backing_file(struct lun *curlun, const char *filename)
3490 {
3491 int ro;
3492 struct file *filp = NULL;
3493 int rc = -EINVAL;
3494 struct inode *inode = NULL;
3495 loff_t size;
3496 loff_t num_sectors;
3497
3498 /* R/W if we can, R/O if we must */
3499 ro = curlun->ro;
3500 if (!ro) {
3501 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3502 if (-EROFS == PTR_ERR(filp))
3503 ro = 1;
3504 }
3505 if (ro)
3506 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3507 if (IS_ERR(filp)) {
3508 LINFO(curlun, "unable to open backing file: %s\n", filename);
3509 return PTR_ERR(filp);
3510 }
3511
3512 if (!(filp->f_mode & FMODE_WRITE))
3513 ro = 1;
3514
3515 if (filp->f_dentry)
3516 inode = filp->f_dentry->d_inode;
3517 if (inode && S_ISBLK(inode->i_mode)) {
3518 if (bdev_read_only(inode->i_bdev))
3519 ro = 1;
3520 } else if (!inode || !S_ISREG(inode->i_mode)) {
3521 LINFO(curlun, "invalid file type: %s\n", filename);
3522 goto out;
3523 }
3524
3525 /* If we can't read the file, it's no good.
3526 * If we can't write the file, use it read-only. */
3527 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3528 LINFO(curlun, "file not readable: %s\n", filename);
3529 goto out;
3530 }
3531 if (!(filp->f_op->write || filp->f_op->aio_write))
3532 ro = 1;
3533
3534 size = i_size_read(inode->i_mapping->host);
3535 if (size < 0) {
3536 LINFO(curlun, "unable to find file size: %s\n", filename);
3537 rc = (int) size;
3538 goto out;
3539 }
3540 num_sectors = size >> 9; // File size in 512-byte sectors
3541 if (num_sectors == 0) {
3542 LINFO(curlun, "file too small: %s\n", filename);
3543 rc = -ETOOSMALL;
3544 goto out;
3545 }
3546
3547 get_file(filp);
3548 curlun->ro = ro;
3549 curlun->filp = filp;
3550 curlun->file_length = size;
3551 curlun->num_sectors = num_sectors;
3552 LDBG(curlun, "open backing file: %s\n", filename);
3553 rc = 0;
3554
3555 out:
3556 filp_close(filp, current->files);
3557 return rc;
3558 }
3559
3560
3561 static void close_backing_file(struct lun *curlun)
3562 {
3563 if (curlun->filp) {
3564 LDBG(curlun, "close backing file\n");
3565 fput(curlun->filp);
3566 curlun->filp = NULL;
3567 }
3568 }
3569
3570 static void close_all_backing_files(struct fsg_dev *fsg)
3571 {
3572 int i;
3573
3574 for (i = 0; i < fsg->nluns; ++i)
3575 close_backing_file(&fsg->luns[i]);
3576 }
3577
3578
3579 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3580 {
3581 struct lun *curlun = dev_to_lun(dev);
3582
3583 return sprintf(buf, "%d\n", curlun->ro);
3584 }
3585
3586 static ssize_t show_file(struct device *dev, struct device_attribute *attr, char *buf)
3587 {
3588 struct lun *curlun = dev_to_lun(dev);
3589 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3590 char *p;
3591 ssize_t rc;
3592
3593 down_read(&fsg->filesem);
3594 if (backing_file_is_open(curlun)) { // Get the complete pathname
3595 p = d_path(curlun->filp->f_dentry, curlun->filp->f_vfsmnt,
3596 buf, PAGE_SIZE - 1);
3597 if (IS_ERR(p))
3598 rc = PTR_ERR(p);
3599 else {
3600 rc = strlen(p);
3601 memmove(buf, p, rc);
3602 buf[rc] = '\n'; // Add a newline
3603 buf[++rc] = 0;
3604 }
3605 } else { // No file, return 0 bytes
3606 *buf = 0;
3607 rc = 0;
3608 }
3609 up_read(&fsg->filesem);
3610 return rc;
3611 }
3612
3613
3614 static ssize_t store_ro(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3615 {
3616 ssize_t rc = count;
3617 struct lun *curlun = dev_to_lun(dev);
3618 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3619 int i;
3620
3621 if (sscanf(buf, "%d", &i) != 1)
3622 return -EINVAL;
3623
3624 /* Allow the write-enable status to change only while the backing file
3625 * is closed. */
3626 down_read(&fsg->filesem);
3627 if (backing_file_is_open(curlun)) {
3628 LDBG(curlun, "read-only status change prevented\n");
3629 rc = -EBUSY;
3630 } else {
3631 curlun->ro = !!i;
3632 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3633 }
3634 up_read(&fsg->filesem);
3635 return rc;
3636 }
3637
3638 static ssize_t store_file(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3639 {
3640 struct lun *curlun = dev_to_lun(dev);
3641 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3642 int rc = 0;
3643
3644 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3645 LDBG(curlun, "eject attempt prevented\n");
3646 return -EBUSY; // "Door is locked"
3647 }
3648
3649 /* Remove a trailing newline */
3650 if (count > 0 && buf[count-1] == '\n')
3651 ((char *) buf)[count-1] = 0; // Ugh!
3652
3653 /* Eject current medium */
3654 down_write(&fsg->filesem);
3655 if (backing_file_is_open(curlun)) {
3656 close_backing_file(curlun);
3657 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3658 }
3659
3660 /* Load new medium */
3661 if (count > 0 && buf[0]) {
3662 rc = open_backing_file(curlun, buf);
3663 if (rc == 0)
3664 curlun->unit_attention_data =
3665 SS_NOT_READY_TO_READY_TRANSITION;
3666 }
3667 up_write(&fsg->filesem);
3668 return (rc < 0 ? rc : count);
3669 }
3670
3671
3672 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3673 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3674 static DEVICE_ATTR(file, 0444, show_file, NULL);
3675
3676
3677 /*-------------------------------------------------------------------------*/
3678
3679 static void fsg_release(struct kref *ref)
3680 {
3681 struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
3682
3683 kfree(fsg->luns);
3684 kfree(fsg);
3685 }
3686
3687 static void lun_release(struct device *dev)
3688 {
3689 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3690
3691 kref_put(&fsg->ref, fsg_release);
3692 }
3693
3694 static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
3695 {
3696 struct fsg_dev *fsg = get_gadget_data(gadget);
3697 int i;
3698 struct lun *curlun;
3699 struct usb_request *req = fsg->ep0req;
3700
3701 DBG(fsg, "unbind\n");
3702 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3703
3704 /* Unregister the sysfs attribute files and the LUNs */
3705 for (i = 0; i < fsg->nluns; ++i) {
3706 curlun = &fsg->luns[i];
3707 if (curlun->registered) {
3708 device_remove_file(&curlun->dev, &dev_attr_ro);
3709 device_remove_file(&curlun->dev, &dev_attr_file);
3710 device_unregister(&curlun->dev);
3711 curlun->registered = 0;
3712 }
3713 }
3714
3715 /* If the thread isn't already dead, tell it to exit now */
3716 if (fsg->state != FSG_STATE_TERMINATED) {
3717 raise_exception(fsg, FSG_STATE_EXIT);
3718 wait_for_completion(&fsg->thread_notifier);
3719
3720 /* The cleanup routine waits for this completion also */
3721 complete(&fsg->thread_notifier);
3722 }
3723
3724 /* Free the data buffers */
3725 for (i = 0; i < NUM_BUFFERS; ++i) {
3726 struct fsg_buffhd *bh = &fsg->buffhds[i];
3727
3728 if (bh->buf)
3729 usb_ep_free_buffer(fsg->bulk_in, bh->buf, bh->dma,
3730 mod_data.buflen);
3731 }
3732
3733 /* Free the request and buffer for endpoint 0 */
3734 if (req) {
3735 if (req->buf)
3736 usb_ep_free_buffer(fsg->ep0, req->buf,
3737 req->dma, EP0_BUFSIZE);
3738 usb_ep_free_request(fsg->ep0, req);
3739 }
3740
3741 set_gadget_data(gadget, NULL);
3742 }
3743
3744
3745 static int __init check_parameters(struct fsg_dev *fsg)
3746 {
3747 int prot;
3748 int gcnum;
3749
3750 /* Store the default values */
3751 mod_data.transport_type = USB_PR_BULK;
3752 mod_data.transport_name = "Bulk-only";
3753 mod_data.protocol_type = USB_SC_SCSI;
3754 mod_data.protocol_name = "Transparent SCSI";
3755
3756 if (gadget_is_sh(fsg->gadget))
3757 mod_data.can_stall = 0;
3758
3759 if (mod_data.release == 0xffff) { // Parameter wasn't set
3760 /* The sa1100 controller is not supported */
3761 if (gadget_is_sa1100(fsg->gadget))
3762 gcnum = -1;
3763 else
3764 gcnum = usb_gadget_controller_number(fsg->gadget);
3765 if (gcnum >= 0)
3766 mod_data.release = 0x0300 + gcnum;
3767 else {
3768 WARN(fsg, "controller '%s' not recognized\n",
3769 fsg->gadget->name);
3770 mod_data.release = 0x0399;
3771 }
3772 }
3773
3774 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3775
3776 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3777 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3778 ; // Use default setting
3779 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3780 mod_data.transport_type = USB_PR_CB;
3781 mod_data.transport_name = "Control-Bulk";
3782 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3783 mod_data.transport_type = USB_PR_CBI;
3784 mod_data.transport_name = "Control-Bulk-Interrupt";
3785 } else {
3786 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3787 return -EINVAL;
3788 }
3789
3790 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3791 prot == USB_SC_SCSI) {
3792 ; // Use default setting
3793 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3794 prot == USB_SC_RBC) {
3795 mod_data.protocol_type = USB_SC_RBC;
3796 mod_data.protocol_name = "RBC";
3797 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3798 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3799 prot == USB_SC_8020) {
3800 mod_data.protocol_type = USB_SC_8020;
3801 mod_data.protocol_name = "8020i (ATAPI)";
3802 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3803 prot == USB_SC_QIC) {
3804 mod_data.protocol_type = USB_SC_QIC;
3805 mod_data.protocol_name = "QIC-157";
3806 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3807 prot == USB_SC_UFI) {
3808 mod_data.protocol_type = USB_SC_UFI;
3809 mod_data.protocol_name = "UFI";
3810 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3811 prot == USB_SC_8070) {
3812 mod_data.protocol_type = USB_SC_8070;
3813 mod_data.protocol_name = "8070i";
3814 } else {
3815 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3816 return -EINVAL;
3817 }
3818
3819 mod_data.buflen &= PAGE_CACHE_MASK;
3820 if (mod_data.buflen <= 0) {
3821 ERROR(fsg, "invalid buflen\n");
3822 return -ETOOSMALL;
3823 }
3824 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3825
3826 return 0;
3827 }
3828
3829
3830 static int __init fsg_bind(struct usb_gadget *gadget)
3831 {
3832 struct fsg_dev *fsg = the_fsg;
3833 int rc;
3834 int i;
3835 struct lun *curlun;
3836 struct usb_ep *ep;
3837 struct usb_request *req;
3838 char *pathbuf, *p;
3839
3840 fsg->gadget = gadget;
3841 set_gadget_data(gadget, fsg);
3842 fsg->ep0 = gadget->ep0;
3843 fsg->ep0->driver_data = fsg;
3844
3845 if ((rc = check_parameters(fsg)) != 0)
3846 goto out;
3847
3848 if (mod_data.removable) { // Enable the store_xxx attributes
3849 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3850 dev_attr_ro.store = store_ro;
3851 dev_attr_file.store = store_file;
3852 }
3853
3854 /* Find out how many LUNs there should be */
3855 i = mod_data.nluns;
3856 if (i == 0)
3857 i = max(mod_data.num_filenames, 1);
3858 if (i > MAX_LUNS) {
3859 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3860 rc = -EINVAL;
3861 goto out;
3862 }
3863
3864 /* Create the LUNs, open their backing files, and register the
3865 * LUN devices in sysfs. */
3866 fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
3867 if (!fsg->luns) {
3868 rc = -ENOMEM;
3869 goto out;
3870 }
3871 fsg->nluns = i;
3872
3873 for (i = 0; i < fsg->nluns; ++i) {
3874 curlun = &fsg->luns[i];
3875 curlun->ro = mod_data.ro[i];
3876 curlun->dev.release = lun_release;
3877 curlun->dev.parent = &gadget->dev;
3878 curlun->dev.driver = &fsg_driver.driver;
3879 dev_set_drvdata(&curlun->dev, fsg);
3880 snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3881 "%s-lun%d", gadget->dev.bus_id, i);
3882
3883 if ((rc = device_register(&curlun->dev)) != 0) {
3884 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3885 goto out;
3886 }
3887 if ((rc = device_create_file(&curlun->dev,
3888 &dev_attr_ro)) != 0 ||
3889 (rc = device_create_file(&curlun->dev,
3890 &dev_attr_file)) != 0) {
3891 device_unregister(&curlun->dev);
3892 goto out;
3893 }
3894 curlun->registered = 1;
3895 kref_get(&fsg->ref);
3896
3897 if (mod_data.file[i] && *mod_data.file[i]) {
3898 if ((rc = open_backing_file(curlun,
3899 mod_data.file[i])) != 0)
3900 goto out;
3901 } else if (!mod_data.removable) {
3902 ERROR(fsg, "no file given for LUN%d\n", i);
3903 rc = -EINVAL;
3904 goto out;
3905 }
3906 }
3907
3908 /* Find all the endpoints we will use */
3909 usb_ep_autoconfig_reset(gadget);
3910 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3911 if (!ep)
3912 goto autoconf_fail;
3913 ep->driver_data = fsg; // claim the endpoint
3914 fsg->bulk_in = ep;
3915
3916 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3917 if (!ep)
3918 goto autoconf_fail;
3919 ep->driver_data = fsg; // claim the endpoint
3920 fsg->bulk_out = ep;
3921
3922 if (transport_is_cbi()) {
3923 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3924 if (!ep)
3925 goto autoconf_fail;
3926 ep->driver_data = fsg; // claim the endpoint
3927 fsg->intr_in = ep;
3928 }
3929
3930 /* Fix up the descriptors */
3931 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3932 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3933 device_desc.idProduct = cpu_to_le16(mod_data.product);
3934 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3935
3936 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3937 intf_desc.bNumEndpoints = i;
3938 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3939 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3940 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3941
3942 #ifdef CONFIG_USB_GADGET_DUALSPEED
3943 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3944
3945 /* Assume ep0 uses the same maxpacket value for both speeds */
3946 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3947
3948 /* Assume that all endpoint addresses are the same for both speeds */
3949 hs_bulk_in_desc.bEndpointAddress = fs_bulk_in_desc.bEndpointAddress;
3950 hs_bulk_out_desc.bEndpointAddress = fs_bulk_out_desc.bEndpointAddress;
3951 hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
3952 #endif
3953
3954 if (gadget->is_otg) {
3955 otg_desc.bmAttributes |= USB_OTG_HNP,
3956 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
3957 }
3958
3959 rc = -ENOMEM;
3960
3961 /* Allocate the request and buffer for endpoint 0 */
3962 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3963 if (!req)
3964 goto out;
3965 req->buf = usb_ep_alloc_buffer(fsg->ep0, EP0_BUFSIZE,
3966 &req->dma, GFP_KERNEL);
3967 if (!req->buf)
3968 goto out;
3969 req->complete = ep0_complete;
3970
3971 /* Allocate the data buffers */
3972 for (i = 0; i < NUM_BUFFERS; ++i) {
3973 struct fsg_buffhd *bh = &fsg->buffhds[i];
3974
3975 /* Allocate for the bulk-in endpoint. We assume that
3976 * the buffer will also work with the bulk-out (and
3977 * interrupt-in) endpoint. */
3978 bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
3979 &bh->dma, GFP_KERNEL);
3980 if (!bh->buf)
3981 goto out;
3982 bh->next = bh + 1;
3983 }
3984 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3985
3986 /* This should reflect the actual gadget power source */
3987 usb_gadget_set_selfpowered(gadget);
3988
3989 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3990 system_utsname.sysname, system_utsname.release,
3991 gadget->name);
3992
3993 /* On a real device, serial[] would be loaded from permanent
3994 * storage. We just encode it from the driver version string. */
3995 for (i = 0; i < sizeof(serial) - 2; i += 2) {
3996 unsigned char c = DRIVER_VERSION[i / 2];
3997
3998 if (!c)
3999 break;
4000 sprintf(&serial[i], "%02X", c);
4001 }
4002
4003 fsg->thread_task = kthread_create(fsg_main_thread, fsg,
4004 "file-storage-gadget");
4005 if (IS_ERR(fsg->thread_task)) {
4006 rc = PTR_ERR(fsg->thread_task);
4007 goto out;
4008 }
4009
4010 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
4011 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
4012
4013 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
4014 for (i = 0; i < fsg->nluns; ++i) {
4015 curlun = &fsg->luns[i];
4016 if (backing_file_is_open(curlun)) {
4017 p = NULL;
4018 if (pathbuf) {
4019 p = d_path(curlun->filp->f_dentry,
4020 curlun->filp->f_vfsmnt,
4021 pathbuf, PATH_MAX);
4022 if (IS_ERR(p))
4023 p = NULL;
4024 }
4025 LINFO(curlun, "ro=%d, file: %s\n",
4026 curlun->ro, (p ? p : "(error)"));
4027 }
4028 }
4029 kfree(pathbuf);
4030
4031 DBG(fsg, "transport=%s (x%02x)\n",
4032 mod_data.transport_name, mod_data.transport_type);
4033 DBG(fsg, "protocol=%s (x%02x)\n",
4034 mod_data.protocol_name, mod_data.protocol_type);
4035 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4036 mod_data.vendor, mod_data.product, mod_data.release);
4037 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
4038 mod_data.removable, mod_data.can_stall,
4039 mod_data.buflen);
4040 DBG(fsg, "I/O thread pid: %d\n", fsg->thread_task->pid);
4041
4042 set_bit(REGISTERED, &fsg->atomic_bitflags);
4043
4044 /* Tell the thread to start working */
4045 wake_up_process(fsg->thread_task);
4046 return 0;
4047
4048 autoconf_fail:
4049 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4050 rc = -ENOTSUPP;
4051
4052 out:
4053 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4054 fsg_unbind(gadget);
4055 close_all_backing_files(fsg);
4056 return rc;
4057 }
4058
4059
4060 /*-------------------------------------------------------------------------*/
4061
4062 static void fsg_suspend(struct usb_gadget *gadget)
4063 {
4064 struct fsg_dev *fsg = get_gadget_data(gadget);
4065
4066 DBG(fsg, "suspend\n");
4067 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4068 }
4069
4070 static void fsg_resume(struct usb_gadget *gadget)
4071 {
4072 struct fsg_dev *fsg = get_gadget_data(gadget);
4073
4074 DBG(fsg, "resume\n");
4075 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4076 }
4077
4078
4079 /*-------------------------------------------------------------------------*/
4080
4081 static struct usb_gadget_driver fsg_driver = {
4082 #ifdef CONFIG_USB_GADGET_DUALSPEED
4083 .speed = USB_SPEED_HIGH,
4084 #else
4085 .speed = USB_SPEED_FULL,
4086 #endif
4087 .function = (char *) longname,
4088 .bind = fsg_bind,
4089 .unbind = __exit_p(fsg_unbind),
4090 .disconnect = fsg_disconnect,
4091 .setup = fsg_setup,
4092 .suspend = fsg_suspend,
4093 .resume = fsg_resume,
4094
4095 .driver = {
4096 .name = (char *) shortname,
4097 .owner = THIS_MODULE,
4098 // .release = ...
4099 // .suspend = ...
4100 // .resume = ...
4101 },
4102 };
4103
4104
4105 static int __init fsg_alloc(void)
4106 {
4107 struct fsg_dev *fsg;
4108
4109 fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
4110 if (!fsg)
4111 return -ENOMEM;
4112 spin_lock_init(&fsg->lock);
4113 init_rwsem(&fsg->filesem);
4114 kref_init(&fsg->ref);
4115 init_completion(&fsg->thread_notifier);
4116
4117 the_fsg = fsg;
4118 return 0;
4119 }
4120
4121
4122 static int __init fsg_init(void)
4123 {
4124 int rc;
4125 struct fsg_dev *fsg;
4126
4127 if ((rc = fsg_alloc()) != 0)
4128 return rc;
4129 fsg = the_fsg;
4130 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0)
4131 kref_put(&fsg->ref, fsg_release);
4132 return rc;
4133 }
4134 module_init(fsg_init);
4135
4136
4137 static void __exit fsg_cleanup(void)
4138 {
4139 struct fsg_dev *fsg = the_fsg;
4140
4141 /* Unregister the driver iff the thread hasn't already done so */
4142 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4143 usb_gadget_unregister_driver(&fsg_driver);
4144
4145 /* Wait for the thread to finish up */
4146 wait_for_completion(&fsg->thread_notifier);
4147
4148 close_all_backing_files(fsg);
4149 kref_put(&fsg->ref, fsg_release);
4150 }
4151 module_exit(fsg_cleanup);
Verdex Pro support