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ACPI: thinkpad-acpi: allow use of CMOS NVRAM for brightness control
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / gadget / file_storage.c
blobbe7a1bd2823b865ed777e0562ac774417057fa74
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/freezer.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 unsigned int info_valid : 1;
571
572 u32 sense_data;
573 u32 sense_data_info;
574 u32 unit_attention_data;
575
576 struct device dev;
577 };
578
579 #define backing_file_is_open(curlun) ((curlun)->filp != NULL)
580
581 static inline struct lun *dev_to_lun(struct device *dev)
582 {
583 return container_of(dev, struct lun, dev);
584 }
585
586
587 /* Big enough to hold our biggest descriptor */
588 #define EP0_BUFSIZE 256
589 #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
590
591 /* Number of buffers we will use. 2 is enough for double-buffering */
592 #define NUM_BUFFERS 2
593
594 enum fsg_buffer_state {
595 BUF_STATE_EMPTY = 0,
596 BUF_STATE_FULL,
597 BUF_STATE_BUSY
598 };
599
600 struct fsg_buffhd {
601 void *buf;
602 dma_addr_t dma;
603 enum fsg_buffer_state state;
604 struct fsg_buffhd *next;
605
606 /* The NetChip 2280 is faster, and handles some protocol faults
607 * better, if we don't submit any short bulk-out read requests.
608 * So we will record the intended request length here. */
609 unsigned int bulk_out_intended_length;
610
611 struct usb_request *inreq;
612 int inreq_busy;
613 struct usb_request *outreq;
614 int outreq_busy;
615 };
616
617 enum fsg_state {
618 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
619 FSG_STATE_DATA_PHASE,
620 FSG_STATE_STATUS_PHASE,
621
622 FSG_STATE_IDLE = 0,
623 FSG_STATE_ABORT_BULK_OUT,
624 FSG_STATE_RESET,
625 FSG_STATE_INTERFACE_CHANGE,
626 FSG_STATE_CONFIG_CHANGE,
627 FSG_STATE_DISCONNECT,
628 FSG_STATE_EXIT,
629 FSG_STATE_TERMINATED
630 };
631
632 enum data_direction {
633 DATA_DIR_UNKNOWN = 0,
634 DATA_DIR_FROM_HOST,
635 DATA_DIR_TO_HOST,
636 DATA_DIR_NONE
637 };
638
639 struct fsg_dev {
640 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
641 spinlock_t lock;
642 struct usb_gadget *gadget;
643
644 /* filesem protects: backing files in use */
645 struct rw_semaphore filesem;
646
647 /* reference counting: wait until all LUNs are released */
648 struct kref ref;
649
650 struct usb_ep *ep0; // Handy copy of gadget->ep0
651 struct usb_request *ep0req; // For control responses
652 unsigned int ep0_req_tag;
653 const char *ep0req_name;
654
655 struct usb_request *intreq; // For interrupt responses
656 int intreq_busy;
657 struct fsg_buffhd *intr_buffhd;
658
659 unsigned int bulk_out_maxpacket;
660 enum fsg_state state; // For exception handling
661 unsigned int exception_req_tag;
662
663 u8 config, new_config;
664
665 unsigned int running : 1;
666 unsigned int bulk_in_enabled : 1;
667 unsigned int bulk_out_enabled : 1;
668 unsigned int intr_in_enabled : 1;
669 unsigned int phase_error : 1;
670 unsigned int short_packet_received : 1;
671 unsigned int bad_lun_okay : 1;
672
673 unsigned long atomic_bitflags;
674 #define REGISTERED 0
675 #define CLEAR_BULK_HALTS 1
676 #define SUSPENDED 2
677
678 struct usb_ep *bulk_in;
679 struct usb_ep *bulk_out;
680 struct usb_ep *intr_in;
681
682 struct fsg_buffhd *next_buffhd_to_fill;
683 struct fsg_buffhd *next_buffhd_to_drain;
684 struct fsg_buffhd buffhds[NUM_BUFFERS];
685
686 int thread_wakeup_needed;
687 struct completion thread_notifier;
688 struct task_struct *thread_task;
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 = 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 = ep->driver_data;
1173 struct fsg_buffhd *bh = 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 = ep->driver_data;
1193 struct fsg_buffhd *bh = 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 = ep->driver_data;
1217 struct fsg_buffhd *bh = 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 curlun->info_valid = 1;
1660 bh->inreq->length = 0;
1661 bh->state = BUF_STATE_FULL;
1662 break;
1663 }
1664
1665 /* Perform the read */
1666 file_offset_tmp = file_offset;
1667 nread = vfs_read(curlun->filp,
1668 (char __user *) bh->buf,
1669 amount, &file_offset_tmp);
1670 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1671 (unsigned long long) file_offset,
1672 (int) nread);
1673 if (signal_pending(current))
1674 return -EINTR;
1675
1676 if (nread < 0) {
1677 LDBG(curlun, "error in file read: %d\n",
1678 (int) nread);
1679 nread = 0;
1680 } else if (nread < amount) {
1681 LDBG(curlun, "partial file read: %d/%u\n",
1682 (int) nread, amount);
1683 nread -= (nread & 511); // Round down to a block
1684 }
1685 file_offset += nread;
1686 amount_left -= nread;
1687 fsg->residue -= nread;
1688 bh->inreq->length = nread;
1689 bh->state = BUF_STATE_FULL;
1690
1691 /* If an error occurred, report it and its position */
1692 if (nread < amount) {
1693 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1694 curlun->sense_data_info = file_offset >> 9;
1695 curlun->info_valid = 1;
1696 break;
1697 }
1698
1699 if (amount_left == 0)
1700 break; // No more left to read
1701
1702 /* Send this buffer and go read some more */
1703 bh->inreq->zero = 0;
1704 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1705 &bh->inreq_busy, &bh->state);
1706 fsg->next_buffhd_to_fill = bh->next;
1707 }
1708
1709 return -EIO; // No default reply
1710 }
1711
1712
1713 /*-------------------------------------------------------------------------*/
1714
1715 static int do_write(struct fsg_dev *fsg)
1716 {
1717 struct lun *curlun = fsg->curlun;
1718 u32 lba;
1719 struct fsg_buffhd *bh;
1720 int get_some_more;
1721 u32 amount_left_to_req, amount_left_to_write;
1722 loff_t usb_offset, file_offset, file_offset_tmp;
1723 unsigned int amount;
1724 unsigned int partial_page;
1725 ssize_t nwritten;
1726 int rc;
1727
1728 if (curlun->ro) {
1729 curlun->sense_data = SS_WRITE_PROTECTED;
1730 return -EINVAL;
1731 }
1732 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1733
1734 /* Get the starting Logical Block Address and check that it's
1735 * not too big */
1736 if (fsg->cmnd[0] == SC_WRITE_6)
1737 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1738 else {
1739 lba = get_be32(&fsg->cmnd[2]);
1740
1741 /* We allow DPO (Disable Page Out = don't save data in the
1742 * cache) and FUA (Force Unit Access = write directly to the
1743 * medium). We don't implement DPO; we implement FUA by
1744 * performing synchronous output. */
1745 if ((fsg->cmnd[1] & ~0x18) != 0) {
1746 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1747 return -EINVAL;
1748 }
1749 if (fsg->cmnd[1] & 0x08) // FUA
1750 curlun->filp->f_flags |= O_SYNC;
1751 }
1752 if (lba >= curlun->num_sectors) {
1753 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1754 return -EINVAL;
1755 }
1756
1757 /* Carry out the file writes */
1758 get_some_more = 1;
1759 file_offset = usb_offset = ((loff_t) lba) << 9;
1760 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1761
1762 while (amount_left_to_write > 0) {
1763
1764 /* Queue a request for more data from the host */
1765 bh = fsg->next_buffhd_to_fill;
1766 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1767
1768 /* Figure out how much we want to get:
1769 * Try to get the remaining amount.
1770 * But don't get more than the buffer size.
1771 * And don't try to go past the end of the file.
1772 * If we're not at a page boundary,
1773 * don't go past the next page.
1774 * If this means getting 0, then we were asked
1775 * to write past the end of file.
1776 * Finally, round down to a block boundary. */
1777 amount = min(amount_left_to_req, mod_data.buflen);
1778 amount = min((loff_t) amount, curlun->file_length -
1779 usb_offset);
1780 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1781 if (partial_page > 0)
1782 amount = min(amount,
1783 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1784
1785 if (amount == 0) {
1786 get_some_more = 0;
1787 curlun->sense_data =
1788 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1789 curlun->sense_data_info = usb_offset >> 9;
1790 curlun->info_valid = 1;
1791 continue;
1792 }
1793 amount -= (amount & 511);
1794 if (amount == 0) {
1795
1796 /* Why were we were asked to transfer a
1797 * partial block? */
1798 get_some_more = 0;
1799 continue;
1800 }
1801
1802 /* Get the next buffer */
1803 usb_offset += amount;
1804 fsg->usb_amount_left -= amount;
1805 amount_left_to_req -= amount;
1806 if (amount_left_to_req == 0)
1807 get_some_more = 0;
1808
1809 /* amount is always divisible by 512, hence by
1810 * the bulk-out maxpacket size */
1811 bh->outreq->length = bh->bulk_out_intended_length =
1812 amount;
1813 bh->outreq->short_not_ok = 1;
1814 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1815 &bh->outreq_busy, &bh->state);
1816 fsg->next_buffhd_to_fill = bh->next;
1817 continue;
1818 }
1819
1820 /* Write the received data to the backing file */
1821 bh = fsg->next_buffhd_to_drain;
1822 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1823 break; // We stopped early
1824 if (bh->state == BUF_STATE_FULL) {
1825 smp_rmb();
1826 fsg->next_buffhd_to_drain = bh->next;
1827 bh->state = BUF_STATE_EMPTY;
1828
1829 /* Did something go wrong with the transfer? */
1830 if (bh->outreq->status != 0) {
1831 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1832 curlun->sense_data_info = file_offset >> 9;
1833 curlun->info_valid = 1;
1834 break;
1835 }
1836
1837 amount = bh->outreq->actual;
1838 if (curlun->file_length - file_offset < amount) {
1839 LERROR(curlun,
1840 "write %u @ %llu beyond end %llu\n",
1841 amount, (unsigned long long) file_offset,
1842 (unsigned long long) curlun->file_length);
1843 amount = curlun->file_length - file_offset;
1844 }
1845
1846 /* Perform the write */
1847 file_offset_tmp = file_offset;
1848 nwritten = vfs_write(curlun->filp,
1849 (char __user *) bh->buf,
1850 amount, &file_offset_tmp);
1851 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1852 (unsigned long long) file_offset,
1853 (int) nwritten);
1854 if (signal_pending(current))
1855 return -EINTR; // Interrupted!
1856
1857 if (nwritten < 0) {
1858 LDBG(curlun, "error in file write: %d\n",
1859 (int) nwritten);
1860 nwritten = 0;
1861 } else if (nwritten < amount) {
1862 LDBG(curlun, "partial file write: %d/%u\n",
1863 (int) nwritten, amount);
1864 nwritten -= (nwritten & 511);
1865 // Round down to a block
1866 }
1867 file_offset += nwritten;
1868 amount_left_to_write -= nwritten;
1869 fsg->residue -= nwritten;
1870
1871 /* If an error occurred, report it and its position */
1872 if (nwritten < amount) {
1873 curlun->sense_data = SS_WRITE_ERROR;
1874 curlun->sense_data_info = file_offset >> 9;
1875 curlun->info_valid = 1;
1876 break;
1877 }
1878
1879 /* Did the host decide to stop early? */
1880 if (bh->outreq->actual != bh->outreq->length) {
1881 fsg->short_packet_received = 1;
1882 break;
1883 }
1884 continue;
1885 }
1886
1887 /* Wait for something to happen */
1888 if ((rc = sleep_thread(fsg)) != 0)
1889 return rc;
1890 }
1891
1892 return -EIO; // No default reply
1893 }
1894
1895
1896 /*-------------------------------------------------------------------------*/
1897
1898 /* Sync the file data, don't bother with the metadata.
1899 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1900 static int fsync_sub(struct lun *curlun)
1901 {
1902 struct file *filp = curlun->filp;
1903 struct inode *inode;
1904 int rc, err;
1905
1906 if (curlun->ro || !filp)
1907 return 0;
1908 if (!filp->f_op->fsync)
1909 return -EINVAL;
1910
1911 inode = filp->f_path.dentry->d_inode;
1912 mutex_lock(&inode->i_mutex);
1913 rc = filemap_fdatawrite(inode->i_mapping);
1914 err = filp->f_op->fsync(filp, filp->f_path.dentry, 1);
1915 if (!rc)
1916 rc = err;
1917 err = filemap_fdatawait(inode->i_mapping);
1918 if (!rc)
1919 rc = err;
1920 mutex_unlock(&inode->i_mutex);
1921 VLDBG(curlun, "fdatasync -> %d\n", rc);
1922 return rc;
1923 }
1924
1925 static void fsync_all(struct fsg_dev *fsg)
1926 {
1927 int i;
1928
1929 for (i = 0; i < fsg->nluns; ++i)
1930 fsync_sub(&fsg->luns[i]);
1931 }
1932
1933 static int do_synchronize_cache(struct fsg_dev *fsg)
1934 {
1935 struct lun *curlun = fsg->curlun;
1936 int rc;
1937
1938 /* We ignore the requested LBA and write out all file's
1939 * dirty data buffers. */
1940 rc = fsync_sub(curlun);
1941 if (rc)
1942 curlun->sense_data = SS_WRITE_ERROR;
1943 return 0;
1944 }
1945
1946
1947 /*-------------------------------------------------------------------------*/
1948
1949 static void invalidate_sub(struct lun *curlun)
1950 {
1951 struct file *filp = curlun->filp;
1952 struct inode *inode = filp->f_path.dentry->d_inode;
1953 unsigned long rc;
1954
1955 rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
1956 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1957 }
1958
1959 static int do_verify(struct fsg_dev *fsg)
1960 {
1961 struct lun *curlun = fsg->curlun;
1962 u32 lba;
1963 u32 verification_length;
1964 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1965 loff_t file_offset, file_offset_tmp;
1966 u32 amount_left;
1967 unsigned int amount;
1968 ssize_t nread;
1969
1970 /* Get the starting Logical Block Address and check that it's
1971 * not too big */
1972 lba = get_be32(&fsg->cmnd[2]);
1973 if (lba >= curlun->num_sectors) {
1974 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1975 return -EINVAL;
1976 }
1977
1978 /* We allow DPO (Disable Page Out = don't save data in the
1979 * cache) but we don't implement it. */
1980 if ((fsg->cmnd[1] & ~0x10) != 0) {
1981 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1982 return -EINVAL;
1983 }
1984
1985 verification_length = get_be16(&fsg->cmnd[7]);
1986 if (unlikely(verification_length == 0))
1987 return -EIO; // No default reply
1988
1989 /* Prepare to carry out the file verify */
1990 amount_left = verification_length << 9;
1991 file_offset = ((loff_t) lba) << 9;
1992
1993 /* Write out all the dirty buffers before invalidating them */
1994 fsync_sub(curlun);
1995 if (signal_pending(current))
1996 return -EINTR;
1997
1998 invalidate_sub(curlun);
1999 if (signal_pending(current))
2000 return -EINTR;
2001
2002 /* Just try to read the requested blocks */
2003 while (amount_left > 0) {
2004
2005 /* Figure out how much we need to read:
2006 * Try to read the remaining amount, but not more than
2007 * the buffer size.
2008 * And don't try to read past the end of the file.
2009 * If this means reading 0 then we were asked to read
2010 * past the end of file. */
2011 amount = min((unsigned int) amount_left, mod_data.buflen);
2012 amount = min((loff_t) amount,
2013 curlun->file_length - file_offset);
2014 if (amount == 0) {
2015 curlun->sense_data =
2016 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
2017 curlun->sense_data_info = file_offset >> 9;
2018 curlun->info_valid = 1;
2019 break;
2020 }
2021
2022 /* Perform the read */
2023 file_offset_tmp = file_offset;
2024 nread = vfs_read(curlun->filp,
2025 (char __user *) bh->buf,
2026 amount, &file_offset_tmp);
2027 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
2028 (unsigned long long) file_offset,
2029 (int) nread);
2030 if (signal_pending(current))
2031 return -EINTR;
2032
2033 if (nread < 0) {
2034 LDBG(curlun, "error in file verify: %d\n",
2035 (int) nread);
2036 nread = 0;
2037 } else if (nread < amount) {
2038 LDBG(curlun, "partial file verify: %d/%u\n",
2039 (int) nread, amount);
2040 nread -= (nread & 511); // Round down to a sector
2041 }
2042 if (nread == 0) {
2043 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2044 curlun->sense_data_info = file_offset >> 9;
2045 curlun->info_valid = 1;
2046 break;
2047 }
2048 file_offset += nread;
2049 amount_left -= nread;
2050 }
2051 return 0;
2052 }
2053
2054
2055 /*-------------------------------------------------------------------------*/
2056
2057 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2058 {
2059 u8 *buf = (u8 *) bh->buf;
2060
2061 static char vendor_id[] = "Linux ";
2062 static char product_id[] = "File-Stor Gadget";
2063
2064 if (!fsg->curlun) { // Unsupported LUNs are okay
2065 fsg->bad_lun_okay = 1;
2066 memset(buf, 0, 36);
2067 buf[0] = 0x7f; // Unsupported, no device-type
2068 return 36;
2069 }
2070
2071 memset(buf, 0, 8); // Non-removable, direct-access device
2072 if (mod_data.removable)
2073 buf[1] = 0x80;
2074 buf[2] = 2; // ANSI SCSI level 2
2075 buf[3] = 2; // SCSI-2 INQUIRY data format
2076 buf[4] = 31; // Additional length
2077 // No special options
2078 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2079 mod_data.release);
2080 return 36;
2081 }
2082
2083
2084 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2085 {
2086 struct lun *curlun = fsg->curlun;
2087 u8 *buf = (u8 *) bh->buf;
2088 u32 sd, sdinfo;
2089 int valid;
2090
2091 /*
2092 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2093 *
2094 * If a REQUEST SENSE command is received from an initiator
2095 * with a pending unit attention condition (before the target
2096 * generates the contingent allegiance condition), then the
2097 * target shall either:
2098 * a) report any pending sense data and preserve the unit
2099 * attention condition on the logical unit, or,
2100 * b) report the unit attention condition, may discard any
2101 * pending sense data, and clear the unit attention
2102 * condition on the logical unit for that initiator.
2103 *
2104 * FSG normally uses option a); enable this code to use option b).
2105 */
2106 #if 0
2107 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2108 curlun->sense_data = curlun->unit_attention_data;
2109 curlun->unit_attention_data = SS_NO_SENSE;
2110 }
2111 #endif
2112
2113 if (!curlun) { // Unsupported LUNs are okay
2114 fsg->bad_lun_okay = 1;
2115 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2116 sdinfo = 0;
2117 valid = 0;
2118 } else {
2119 sd = curlun->sense_data;
2120 sdinfo = curlun->sense_data_info;
2121 valid = curlun->info_valid << 7;
2122 curlun->sense_data = SS_NO_SENSE;
2123 curlun->sense_data_info = 0;
2124 curlun->info_valid = 0;
2125 }
2126
2127 memset(buf, 0, 18);
2128 buf[0] = valid | 0x70; // Valid, current error
2129 buf[2] = SK(sd);
2130 put_be32(&buf[3], sdinfo); // Sense information
2131 buf[7] = 18 - 8; // Additional sense length
2132 buf[12] = ASC(sd);
2133 buf[13] = ASCQ(sd);
2134 return 18;
2135 }
2136
2137
2138 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2139 {
2140 struct lun *curlun = fsg->curlun;
2141 u32 lba = get_be32(&fsg->cmnd[2]);
2142 int pmi = fsg->cmnd[8];
2143 u8 *buf = (u8 *) bh->buf;
2144
2145 /* Check the PMI and LBA fields */
2146 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2147 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2148 return -EINVAL;
2149 }
2150
2151 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2152 put_be32(&buf[4], 512); // Block length
2153 return 8;
2154 }
2155
2156
2157 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2158 {
2159 struct lun *curlun = fsg->curlun;
2160 int mscmnd = fsg->cmnd[0];
2161 u8 *buf = (u8 *) bh->buf;
2162 u8 *buf0 = buf;
2163 int pc, page_code;
2164 int changeable_values, all_pages;
2165 int valid_page = 0;
2166 int len, limit;
2167
2168 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2169 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2170 return -EINVAL;
2171 }
2172 pc = fsg->cmnd[2] >> 6;
2173 page_code = fsg->cmnd[2] & 0x3f;
2174 if (pc == 3) {
2175 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2176 return -EINVAL;
2177 }
2178 changeable_values = (pc == 1);
2179 all_pages = (page_code == 0x3f);
2180
2181 /* Write the mode parameter header. Fixed values are: default
2182 * medium type, no cache control (DPOFUA), and no block descriptors.
2183 * The only variable value is the WriteProtect bit. We will fill in
2184 * the mode data length later. */
2185 memset(buf, 0, 8);
2186 if (mscmnd == SC_MODE_SENSE_6) {
2187 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2188 buf += 4;
2189 limit = 255;
2190 } else { // SC_MODE_SENSE_10
2191 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2192 buf += 8;
2193 limit = 65535; // Should really be mod_data.buflen
2194 }
2195
2196 /* No block descriptors */
2197
2198 /* The mode pages, in numerical order. The only page we support
2199 * is the Caching page. */
2200 if (page_code == 0x08 || all_pages) {
2201 valid_page = 1;
2202 buf[0] = 0x08; // Page code
2203 buf[1] = 10; // Page length
2204 memset(buf+2, 0, 10); // None of the fields are changeable
2205
2206 if (!changeable_values) {
2207 buf[2] = 0x04; // Write cache enable,
2208 // Read cache not disabled
2209 // No cache retention priorities
2210 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2211 // Minimum prefetch = 0
2212 put_be16(&buf[8], 0xffff); // Maximum prefetch
2213 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2214 }
2215 buf += 12;
2216 }
2217
2218 /* Check that a valid page was requested and the mode data length
2219 * isn't too long. */
2220 len = buf - buf0;
2221 if (!valid_page || len > limit) {
2222 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2223 return -EINVAL;
2224 }
2225
2226 /* Store the mode data length */
2227 if (mscmnd == SC_MODE_SENSE_6)
2228 buf0[0] = len - 1;
2229 else
2230 put_be16(buf0, len - 2);
2231 return len;
2232 }
2233
2234
2235 static int do_start_stop(struct fsg_dev *fsg)
2236 {
2237 struct lun *curlun = fsg->curlun;
2238 int loej, start;
2239
2240 if (!mod_data.removable) {
2241 curlun->sense_data = SS_INVALID_COMMAND;
2242 return -EINVAL;
2243 }
2244
2245 // int immed = fsg->cmnd[1] & 0x01;
2246 loej = fsg->cmnd[4] & 0x02;
2247 start = fsg->cmnd[4] & 0x01;
2248
2249 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2250 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2251 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2252 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2253 return -EINVAL;
2254 }
2255
2256 if (!start) {
2257
2258 /* Are we allowed to unload the media? */
2259 if (curlun->prevent_medium_removal) {
2260 LDBG(curlun, "unload attempt prevented\n");
2261 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2262 return -EINVAL;
2263 }
2264 if (loej) { // Simulate an unload/eject
2265 up_read(&fsg->filesem);
2266 down_write(&fsg->filesem);
2267 close_backing_file(curlun);
2268 up_write(&fsg->filesem);
2269 down_read(&fsg->filesem);
2270 }
2271 } else {
2272
2273 /* Our emulation doesn't support mounting; the medium is
2274 * available for use as soon as it is loaded. */
2275 if (!backing_file_is_open(curlun)) {
2276 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2277 return -EINVAL;
2278 }
2279 }
2280 #endif
2281 return 0;
2282 }
2283
2284
2285 static int do_prevent_allow(struct fsg_dev *fsg)
2286 {
2287 struct lun *curlun = fsg->curlun;
2288 int prevent;
2289
2290 if (!mod_data.removable) {
2291 curlun->sense_data = SS_INVALID_COMMAND;
2292 return -EINVAL;
2293 }
2294
2295 prevent = fsg->cmnd[4] & 0x01;
2296 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2297 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2298 return -EINVAL;
2299 }
2300
2301 if (curlun->prevent_medium_removal && !prevent)
2302 fsync_sub(curlun);
2303 curlun->prevent_medium_removal = prevent;
2304 return 0;
2305 }
2306
2307
2308 static int do_read_format_capacities(struct fsg_dev *fsg,
2309 struct fsg_buffhd *bh)
2310 {
2311 struct lun *curlun = fsg->curlun;
2312 u8 *buf = (u8 *) bh->buf;
2313
2314 buf[0] = buf[1] = buf[2] = 0;
2315 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2316 buf += 4;
2317
2318 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2319 put_be32(&buf[4], 512); // Block length
2320 buf[4] = 0x02; // Current capacity
2321 return 12;
2322 }
2323
2324
2325 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2326 {
2327 struct lun *curlun = fsg->curlun;
2328
2329 /* We don't support MODE SELECT */
2330 curlun->sense_data = SS_INVALID_COMMAND;
2331 return -EINVAL;
2332 }
2333
2334
2335 /*-------------------------------------------------------------------------*/
2336
2337 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2338 {
2339 int rc;
2340
2341 rc = fsg_set_halt(fsg, fsg->bulk_in);
2342 if (rc == -EAGAIN)
2343 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2344 while (rc != 0) {
2345 if (rc != -EAGAIN) {
2346 WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
2347 rc = 0;
2348 break;
2349 }
2350
2351 /* Wait for a short time and then try again */
2352 if (msleep_interruptible(100) != 0)
2353 return -EINTR;
2354 rc = usb_ep_set_halt(fsg->bulk_in);
2355 }
2356 return rc;
2357 }
2358
2359 static int pad_with_zeros(struct fsg_dev *fsg)
2360 {
2361 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2362 u32 nkeep = bh->inreq->length;
2363 u32 nsend;
2364 int rc;
2365
2366 bh->state = BUF_STATE_EMPTY; // For the first iteration
2367 fsg->usb_amount_left = nkeep + fsg->residue;
2368 while (fsg->usb_amount_left > 0) {
2369
2370 /* Wait for the next buffer to be free */
2371 while (bh->state != BUF_STATE_EMPTY) {
2372 if ((rc = sleep_thread(fsg)) != 0)
2373 return rc;
2374 }
2375
2376 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2377 memset(bh->buf + nkeep, 0, nsend - nkeep);
2378 bh->inreq->length = nsend;
2379 bh->inreq->zero = 0;
2380 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2381 &bh->inreq_busy, &bh->state);
2382 bh = fsg->next_buffhd_to_fill = bh->next;
2383 fsg->usb_amount_left -= nsend;
2384 nkeep = 0;
2385 }
2386 return 0;
2387 }
2388
2389 static int throw_away_data(struct fsg_dev *fsg)
2390 {
2391 struct fsg_buffhd *bh;
2392 u32 amount;
2393 int rc;
2394
2395 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2396 fsg->usb_amount_left > 0) {
2397
2398 /* Throw away the data in a filled buffer */
2399 if (bh->state == BUF_STATE_FULL) {
2400 smp_rmb();
2401 bh->state = BUF_STATE_EMPTY;
2402 fsg->next_buffhd_to_drain = bh->next;
2403
2404 /* A short packet or an error ends everything */
2405 if (bh->outreq->actual != bh->outreq->length ||
2406 bh->outreq->status != 0) {
2407 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2408 return -EINTR;
2409 }
2410 continue;
2411 }
2412
2413 /* Try to submit another request if we need one */
2414 bh = fsg->next_buffhd_to_fill;
2415 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2416 amount = min(fsg->usb_amount_left,
2417 (u32) mod_data.buflen);
2418
2419 /* amount is always divisible by 512, hence by
2420 * the bulk-out maxpacket size */
2421 bh->outreq->length = bh->bulk_out_intended_length =
2422 amount;
2423 bh->outreq->short_not_ok = 1;
2424 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2425 &bh->outreq_busy, &bh->state);
2426 fsg->next_buffhd_to_fill = bh->next;
2427 fsg->usb_amount_left -= amount;
2428 continue;
2429 }
2430
2431 /* Otherwise wait for something to happen */
2432 if ((rc = sleep_thread(fsg)) != 0)
2433 return rc;
2434 }
2435 return 0;
2436 }
2437
2438
2439 static int finish_reply(struct fsg_dev *fsg)
2440 {
2441 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2442 int rc = 0;
2443
2444 switch (fsg->data_dir) {
2445 case DATA_DIR_NONE:
2446 break; // Nothing to send
2447
2448 /* If we don't know whether the host wants to read or write,
2449 * this must be CB or CBI with an unknown command. We mustn't
2450 * try to send or receive any data. So stall both bulk pipes
2451 * if we can and wait for a reset. */
2452 case DATA_DIR_UNKNOWN:
2453 if (mod_data.can_stall) {
2454 fsg_set_halt(fsg, fsg->bulk_out);
2455 rc = halt_bulk_in_endpoint(fsg);
2456 }
2457 break;
2458
2459 /* All but the last buffer of data must have already been sent */
2460 case DATA_DIR_TO_HOST:
2461 if (fsg->data_size == 0)
2462 ; // Nothing to send
2463
2464 /* If there's no residue, simply send the last buffer */
2465 else if (fsg->residue == 0) {
2466 bh->inreq->zero = 0;
2467 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2468 &bh->inreq_busy, &bh->state);
2469 fsg->next_buffhd_to_fill = bh->next;
2470 }
2471
2472 /* There is a residue. For CB and CBI, simply mark the end
2473 * of the data with a short packet. However, if we are
2474 * allowed to stall, there was no data at all (residue ==
2475 * data_size), and the command failed (invalid LUN or
2476 * sense data is set), then halt the bulk-in endpoint
2477 * instead. */
2478 else if (!transport_is_bbb()) {
2479 if (mod_data.can_stall &&
2480 fsg->residue == fsg->data_size &&
2481 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2482 bh->state = BUF_STATE_EMPTY;
2483 rc = halt_bulk_in_endpoint(fsg);
2484 } else {
2485 bh->inreq->zero = 1;
2486 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2487 &bh->inreq_busy, &bh->state);
2488 fsg->next_buffhd_to_fill = bh->next;
2489 }
2490 }
2491
2492 /* For Bulk-only, if we're allowed to stall then send the
2493 * short packet and halt the bulk-in endpoint. If we can't
2494 * stall, pad out the remaining data with 0's. */
2495 else {
2496 if (mod_data.can_stall) {
2497 bh->inreq->zero = 1;
2498 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2499 &bh->inreq_busy, &bh->state);
2500 fsg->next_buffhd_to_fill = bh->next;
2501 rc = halt_bulk_in_endpoint(fsg);
2502 } else
2503 rc = pad_with_zeros(fsg);
2504 }
2505 break;
2506
2507 /* We have processed all we want from the data the host has sent.
2508 * There may still be outstanding bulk-out requests. */
2509 case DATA_DIR_FROM_HOST:
2510 if (fsg->residue == 0)
2511 ; // Nothing to receive
2512
2513 /* Did the host stop sending unexpectedly early? */
2514 else if (fsg->short_packet_received) {
2515 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2516 rc = -EINTR;
2517 }
2518
2519 /* We haven't processed all the incoming data. Even though
2520 * we may be allowed to stall, doing so would cause a race.
2521 * The controller may already have ACK'ed all the remaining
2522 * bulk-out packets, in which case the host wouldn't see a
2523 * STALL. Not realizing the endpoint was halted, it wouldn't
2524 * clear the halt -- leading to problems later on. */
2525 #if 0
2526 else if (mod_data.can_stall) {
2527 fsg_set_halt(fsg, fsg->bulk_out);
2528 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2529 rc = -EINTR;
2530 }
2531 #endif
2532
2533 /* We can't stall. Read in the excess data and throw it
2534 * all away. */
2535 else
2536 rc = throw_away_data(fsg);
2537 break;
2538 }
2539 return rc;
2540 }
2541
2542
2543 static int send_status(struct fsg_dev *fsg)
2544 {
2545 struct lun *curlun = fsg->curlun;
2546 struct fsg_buffhd *bh;
2547 int rc;
2548 u8 status = USB_STATUS_PASS;
2549 u32 sd, sdinfo = 0;
2550
2551 /* Wait for the next buffer to become available */
2552 bh = fsg->next_buffhd_to_fill;
2553 while (bh->state != BUF_STATE_EMPTY) {
2554 if ((rc = sleep_thread(fsg)) != 0)
2555 return rc;
2556 }
2557
2558 if (curlun) {
2559 sd = curlun->sense_data;
2560 sdinfo = curlun->sense_data_info;
2561 } else if (fsg->bad_lun_okay)
2562 sd = SS_NO_SENSE;
2563 else
2564 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2565
2566 if (fsg->phase_error) {
2567 DBG(fsg, "sending phase-error status\n");
2568 status = USB_STATUS_PHASE_ERROR;
2569 sd = SS_INVALID_COMMAND;
2570 } else if (sd != SS_NO_SENSE) {
2571 DBG(fsg, "sending command-failure status\n");
2572 status = USB_STATUS_FAIL;
2573 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2574 " info x%x\n",
2575 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2576 }
2577
2578 if (transport_is_bbb()) {
2579 struct bulk_cs_wrap *csw = bh->buf;
2580
2581 /* Store and send the Bulk-only CSW */
2582 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2583 csw->Tag = fsg->tag;
2584 csw->Residue = cpu_to_le32(fsg->residue);
2585 csw->Status = status;
2586
2587 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2588 bh->inreq->zero = 0;
2589 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2590 &bh->inreq_busy, &bh->state);
2591
2592 } else if (mod_data.transport_type == USB_PR_CB) {
2593
2594 /* Control-Bulk transport has no status phase! */
2595 return 0;
2596
2597 } else { // USB_PR_CBI
2598 struct interrupt_data *buf = bh->buf;
2599
2600 /* Store and send the Interrupt data. UFI sends the ASC
2601 * and ASCQ bytes. Everything else sends a Type (which
2602 * is always 0) and the status Value. */
2603 if (mod_data.protocol_type == USB_SC_UFI) {
2604 buf->bType = ASC(sd);
2605 buf->bValue = ASCQ(sd);
2606 } else {
2607 buf->bType = 0;
2608 buf->bValue = status;
2609 }
2610 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2611
2612 fsg->intr_buffhd = bh; // Point to the right buffhd
2613 fsg->intreq->buf = bh->inreq->buf;
2614 fsg->intreq->dma = bh->inreq->dma;
2615 fsg->intreq->context = bh;
2616 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2617 &fsg->intreq_busy, &bh->state);
2618 }
2619
2620 fsg->next_buffhd_to_fill = bh->next;
2621 return 0;
2622 }
2623
2624
2625 /*-------------------------------------------------------------------------*/
2626
2627 /* Check whether the command is properly formed and whether its data size
2628 * and direction agree with the values we already have. */
2629 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2630 enum data_direction data_dir, unsigned int mask,
2631 int needs_medium, const char *name)
2632 {
2633 int i;
2634 int lun = fsg->cmnd[1] >> 5;
2635 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2636 char hdlen[20];
2637 struct lun *curlun;
2638
2639 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2640 * Transparent SCSI doesn't pad. */
2641 if (protocol_is_scsi())
2642 ;
2643
2644 /* There's some disagreement as to whether RBC pads commands or not.
2645 * We'll play it safe and accept either form. */
2646 else if (mod_data.protocol_type == USB_SC_RBC) {
2647 if (fsg->cmnd_size == 12)
2648 cmnd_size = 12;
2649
2650 /* All the other protocols pad to 12 bytes */
2651 } else
2652 cmnd_size = 12;
2653
2654 hdlen[0] = 0;
2655 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2656 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2657 fsg->data_size);
2658 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2659 name, cmnd_size, dirletter[(int) data_dir],
2660 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2661
2662 /* We can't reply at all until we know the correct data direction
2663 * and size. */
2664 if (fsg->data_size_from_cmnd == 0)
2665 data_dir = DATA_DIR_NONE;
2666 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2667 fsg->data_dir = data_dir;
2668 fsg->data_size = fsg->data_size_from_cmnd;
2669
2670 } else { // Bulk-only
2671 if (fsg->data_size < fsg->data_size_from_cmnd) {
2672
2673 /* Host data size < Device data size is a phase error.
2674 * Carry out the command, but only transfer as much
2675 * as we are allowed. */
2676 fsg->data_size_from_cmnd = fsg->data_size;
2677 fsg->phase_error = 1;
2678 }
2679 }
2680 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2681
2682 /* Conflicting data directions is a phase error */
2683 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2684 fsg->phase_error = 1;
2685 return -EINVAL;
2686 }
2687
2688 /* Verify the length of the command itself */
2689 if (cmnd_size != fsg->cmnd_size) {
2690
2691 /* Special case workaround: MS-Windows issues REQUEST SENSE
2692 * with cbw->Length == 12 (it should be 6). */
2693 if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2694 cmnd_size = fsg->cmnd_size;
2695 else {
2696 fsg->phase_error = 1;
2697 return -EINVAL;
2698 }
2699 }
2700
2701 /* Check that the LUN values are consistent */
2702 if (transport_is_bbb()) {
2703 if (fsg->lun != lun)
2704 DBG(fsg, "using LUN %d from CBW, "
2705 "not LUN %d from CDB\n",
2706 fsg->lun, lun);
2707 } else
2708 fsg->lun = lun; // Use LUN from the command
2709
2710 /* Check the LUN */
2711 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2712 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2713 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2714 curlun->sense_data = SS_NO_SENSE;
2715 curlun->sense_data_info = 0;
2716 curlun->info_valid = 0;
2717 }
2718 } else {
2719 fsg->curlun = curlun = NULL;
2720 fsg->bad_lun_okay = 0;
2721
2722 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2723 * to use unsupported LUNs; all others may not. */
2724 if (fsg->cmnd[0] != SC_INQUIRY &&
2725 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2726 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2727 return -EINVAL;
2728 }
2729 }
2730
2731 /* If a unit attention condition exists, only INQUIRY and
2732 * REQUEST SENSE commands are allowed; anything else must fail. */
2733 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2734 fsg->cmnd[0] != SC_INQUIRY &&
2735 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2736 curlun->sense_data = curlun->unit_attention_data;
2737 curlun->unit_attention_data = SS_NO_SENSE;
2738 return -EINVAL;
2739 }
2740
2741 /* Check that only command bytes listed in the mask are non-zero */
2742 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2743 for (i = 1; i < cmnd_size; ++i) {
2744 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2745 if (curlun)
2746 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2747 return -EINVAL;
2748 }
2749 }
2750
2751 /* If the medium isn't mounted and the command needs to access
2752 * it, return an error. */
2753 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2754 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2755 return -EINVAL;
2756 }
2757
2758 return 0;
2759 }
2760
2761
2762 static int do_scsi_command(struct fsg_dev *fsg)
2763 {
2764 struct fsg_buffhd *bh;
2765 int rc;
2766 int reply = -EINVAL;
2767 int i;
2768 static char unknown[16];
2769
2770 dump_cdb(fsg);
2771
2772 /* Wait for the next buffer to become available for data or status */
2773 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2774 while (bh->state != BUF_STATE_EMPTY) {
2775 if ((rc = sleep_thread(fsg)) != 0)
2776 return rc;
2777 }
2778 fsg->phase_error = 0;
2779 fsg->short_packet_received = 0;
2780
2781 down_read(&fsg->filesem); // We're using the backing file
2782 switch (fsg->cmnd[0]) {
2783
2784 case SC_INQUIRY:
2785 fsg->data_size_from_cmnd = fsg->cmnd[4];
2786 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2787 (1<<4), 0,
2788 "INQUIRY")) == 0)
2789 reply = do_inquiry(fsg, bh);
2790 break;
2791
2792 case SC_MODE_SELECT_6:
2793 fsg->data_size_from_cmnd = fsg->cmnd[4];
2794 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2795 (1<<1) | (1<<4), 0,
2796 "MODE SELECT(6)")) == 0)
2797 reply = do_mode_select(fsg, bh);
2798 break;
2799
2800 case SC_MODE_SELECT_10:
2801 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2802 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2803 (1<<1) | (3<<7), 0,
2804 "MODE SELECT(10)")) == 0)
2805 reply = do_mode_select(fsg, bh);
2806 break;
2807
2808 case SC_MODE_SENSE_6:
2809 fsg->data_size_from_cmnd = fsg->cmnd[4];
2810 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2811 (1<<1) | (1<<2) | (1<<4), 0,
2812 "MODE SENSE(6)")) == 0)
2813 reply = do_mode_sense(fsg, bh);
2814 break;
2815
2816 case SC_MODE_SENSE_10:
2817 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2818 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2819 (1<<1) | (1<<2) | (3<<7), 0,
2820 "MODE SENSE(10)")) == 0)
2821 reply = do_mode_sense(fsg, bh);
2822 break;
2823
2824 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2825 fsg->data_size_from_cmnd = 0;
2826 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2827 (1<<4), 0,
2828 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2829 reply = do_prevent_allow(fsg);
2830 break;
2831
2832 case SC_READ_6:
2833 i = fsg->cmnd[4];
2834 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2835 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2836 (7<<1) | (1<<4), 1,
2837 "READ(6)")) == 0)
2838 reply = do_read(fsg);
2839 break;
2840
2841 case SC_READ_10:
2842 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2843 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2844 (1<<1) | (0xf<<2) | (3<<7), 1,
2845 "READ(10)")) == 0)
2846 reply = do_read(fsg);
2847 break;
2848
2849 case SC_READ_12:
2850 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2851 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2852 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2853 "READ(12)")) == 0)
2854 reply = do_read(fsg);
2855 break;
2856
2857 case SC_READ_CAPACITY:
2858 fsg->data_size_from_cmnd = 8;
2859 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2860 (0xf<<2) | (1<<8), 1,
2861 "READ CAPACITY")) == 0)
2862 reply = do_read_capacity(fsg, bh);
2863 break;
2864
2865 case SC_READ_FORMAT_CAPACITIES:
2866 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2867 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2868 (3<<7), 1,
2869 "READ FORMAT CAPACITIES")) == 0)
2870 reply = do_read_format_capacities(fsg, bh);
2871 break;
2872
2873 case SC_REQUEST_SENSE:
2874 fsg->data_size_from_cmnd = fsg->cmnd[4];
2875 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2876 (1<<4), 0,
2877 "REQUEST SENSE")) == 0)
2878 reply = do_request_sense(fsg, bh);
2879 break;
2880
2881 case SC_START_STOP_UNIT:
2882 fsg->data_size_from_cmnd = 0;
2883 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2884 (1<<1) | (1<<4), 0,
2885 "START-STOP UNIT")) == 0)
2886 reply = do_start_stop(fsg);
2887 break;
2888
2889 case SC_SYNCHRONIZE_CACHE:
2890 fsg->data_size_from_cmnd = 0;
2891 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2892 (0xf<<2) | (3<<7), 1,
2893 "SYNCHRONIZE CACHE")) == 0)
2894 reply = do_synchronize_cache(fsg);
2895 break;
2896
2897 case SC_TEST_UNIT_READY:
2898 fsg->data_size_from_cmnd = 0;
2899 reply = check_command(fsg, 6, DATA_DIR_NONE,
2900 0, 1,
2901 "TEST UNIT READY");
2902 break;
2903
2904 /* Although optional, this command is used by MS-Windows. We
2905 * support a minimal version: BytChk must be 0. */
2906 case SC_VERIFY:
2907 fsg->data_size_from_cmnd = 0;
2908 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2909 (1<<1) | (0xf<<2) | (3<<7), 1,
2910 "VERIFY")) == 0)
2911 reply = do_verify(fsg);
2912 break;
2913
2914 case SC_WRITE_6:
2915 i = fsg->cmnd[4];
2916 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2917 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2918 (7<<1) | (1<<4), 1,
2919 "WRITE(6)")) == 0)
2920 reply = do_write(fsg);
2921 break;
2922
2923 case SC_WRITE_10:
2924 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2925 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2926 (1<<1) | (0xf<<2) | (3<<7), 1,
2927 "WRITE(10)")) == 0)
2928 reply = do_write(fsg);
2929 break;
2930
2931 case SC_WRITE_12:
2932 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2933 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2934 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2935 "WRITE(12)")) == 0)
2936 reply = do_write(fsg);
2937 break;
2938
2939 /* Some mandatory commands that we recognize but don't implement.
2940 * They don't mean much in this setting. It's left as an exercise
2941 * for anyone interested to implement RESERVE and RELEASE in terms
2942 * of Posix locks. */
2943 case SC_FORMAT_UNIT:
2944 case SC_RELEASE:
2945 case SC_RESERVE:
2946 case SC_SEND_DIAGNOSTIC:
2947 // Fall through
2948
2949 default:
2950 fsg->data_size_from_cmnd = 0;
2951 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2952 if ((reply = check_command(fsg, fsg->cmnd_size,
2953 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2954 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2955 reply = -EINVAL;
2956 }
2957 break;
2958 }
2959 up_read(&fsg->filesem);
2960
2961 if (reply == -EINTR || signal_pending(current))
2962 return -EINTR;
2963
2964 /* Set up the single reply buffer for finish_reply() */
2965 if (reply == -EINVAL)
2966 reply = 0; // Error reply length
2967 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2968 reply = min((u32) reply, fsg->data_size_from_cmnd);
2969 bh->inreq->length = reply;
2970 bh->state = BUF_STATE_FULL;
2971 fsg->residue -= reply;
2972 } // Otherwise it's already set
2973
2974 return 0;
2975 }
2976
2977
2978 /*-------------------------------------------------------------------------*/
2979
2980 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2981 {
2982 struct usb_request *req = bh->outreq;
2983 struct bulk_cb_wrap *cbw = req->buf;
2984
2985 /* Was this a real packet? */
2986 if (req->status)
2987 return -EINVAL;
2988
2989 /* Is the CBW valid? */
2990 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2991 cbw->Signature != __constant_cpu_to_le32(
2992 USB_BULK_CB_SIG)) {
2993 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2994 req->actual,
2995 le32_to_cpu(cbw->Signature));
2996
2997 /* The Bulk-only spec says we MUST stall the bulk pipes!
2998 * If we want to avoid stalls, set a flag so that we will
2999 * clear the endpoint halts at the next reset. */
3000 if (!mod_data.can_stall)
3001 set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
3002 fsg_set_halt(fsg, fsg->bulk_out);
3003 halt_bulk_in_endpoint(fsg);
3004 return -EINVAL;
3005 }
3006
3007 /* Is the CBW meaningful? */
3008 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
3009 cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
3010 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
3011 "cmdlen %u\n",
3012 cbw->Lun, cbw->Flags, cbw->Length);
3013
3014 /* We can do anything we want here, so let's stall the
3015 * bulk pipes if we are allowed to. */
3016 if (mod_data.can_stall) {
3017 fsg_set_halt(fsg, fsg->bulk_out);
3018 halt_bulk_in_endpoint(fsg);
3019 }
3020 return -EINVAL;
3021 }
3022
3023 /* Save the command for later */
3024 fsg->cmnd_size = cbw->Length;
3025 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
3026 if (cbw->Flags & USB_BULK_IN_FLAG)
3027 fsg->data_dir = DATA_DIR_TO_HOST;
3028 else
3029 fsg->data_dir = DATA_DIR_FROM_HOST;
3030 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
3031 if (fsg->data_size == 0)
3032 fsg->data_dir = DATA_DIR_NONE;
3033 fsg->lun = cbw->Lun;
3034 fsg->tag = cbw->Tag;
3035 return 0;
3036 }
3037
3038
3039 static int get_next_command(struct fsg_dev *fsg)
3040 {
3041 struct fsg_buffhd *bh;
3042 int rc = 0;
3043
3044 if (transport_is_bbb()) {
3045
3046 /* Wait for the next buffer to become available */
3047 bh = fsg->next_buffhd_to_fill;
3048 while (bh->state != BUF_STATE_EMPTY) {
3049 if ((rc = sleep_thread(fsg)) != 0)
3050 return rc;
3051 }
3052
3053 /* Queue a request to read a Bulk-only CBW */
3054 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3055 bh->outreq->short_not_ok = 1;
3056 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3057 &bh->outreq_busy, &bh->state);
3058
3059 /* We will drain the buffer in software, which means we
3060 * can reuse it for the next filling. No need to advance
3061 * next_buffhd_to_fill. */
3062
3063 /* Wait for the CBW to arrive */
3064 while (bh->state != BUF_STATE_FULL) {
3065 if ((rc = sleep_thread(fsg)) != 0)
3066 return rc;
3067 }
3068 smp_rmb();
3069 rc = received_cbw(fsg, bh);
3070 bh->state = BUF_STATE_EMPTY;
3071
3072 } else { // USB_PR_CB or USB_PR_CBI
3073
3074 /* Wait for the next command to arrive */
3075 while (fsg->cbbuf_cmnd_size == 0) {
3076 if ((rc = sleep_thread(fsg)) != 0)
3077 return rc;
3078 }
3079
3080 /* Is the previous status interrupt request still busy?
3081 * The host is allowed to skip reading the status,
3082 * so we must cancel it. */
3083 if (fsg->intreq_busy)
3084 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3085
3086 /* Copy the command and mark the buffer empty */
3087 fsg->data_dir = DATA_DIR_UNKNOWN;
3088 spin_lock_irq(&fsg->lock);
3089 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3090 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3091 fsg->cbbuf_cmnd_size = 0;
3092 spin_unlock_irq(&fsg->lock);
3093 }
3094 return rc;
3095 }
3096
3097
3098 /*-------------------------------------------------------------------------*/
3099
3100 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3101 const struct usb_endpoint_descriptor *d)
3102 {
3103 int rc;
3104
3105 ep->driver_data = fsg;
3106 rc = usb_ep_enable(ep, d);
3107 if (rc)
3108 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3109 return rc;
3110 }
3111
3112 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3113 struct usb_request **preq)
3114 {
3115 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3116 if (*preq)
3117 return 0;
3118 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3119 return -ENOMEM;
3120 }
3121
3122 /*
3123 * Reset interface setting and re-init endpoint state (toggle etc).
3124 * Call with altsetting < 0 to disable the interface. The only other
3125 * available altsetting is 0, which enables the interface.
3126 */
3127 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3128 {
3129 int rc = 0;
3130 int i;
3131 const struct usb_endpoint_descriptor *d;
3132
3133 if (fsg->running)
3134 DBG(fsg, "reset interface\n");
3135
3136 reset:
3137 /* Deallocate the requests */
3138 for (i = 0; i < NUM_BUFFERS; ++i) {
3139 struct fsg_buffhd *bh = &fsg->buffhds[i];
3140
3141 if (bh->inreq) {
3142 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3143 bh->inreq = NULL;
3144 }
3145 if (bh->outreq) {
3146 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3147 bh->outreq = NULL;
3148 }
3149 }
3150 if (fsg->intreq) {
3151 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3152 fsg->intreq = NULL;
3153 }
3154
3155 /* Disable the endpoints */
3156 if (fsg->bulk_in_enabled) {
3157 usb_ep_disable(fsg->bulk_in);
3158 fsg->bulk_in_enabled = 0;
3159 }
3160 if (fsg->bulk_out_enabled) {
3161 usb_ep_disable(fsg->bulk_out);
3162 fsg->bulk_out_enabled = 0;
3163 }
3164 if (fsg->intr_in_enabled) {
3165 usb_ep_disable(fsg->intr_in);
3166 fsg->intr_in_enabled = 0;
3167 }
3168
3169 fsg->running = 0;
3170 if (altsetting < 0 || rc != 0)
3171 return rc;
3172
3173 DBG(fsg, "set interface %d\n", altsetting);
3174
3175 /* Enable the endpoints */
3176 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3177 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3178 goto reset;
3179 fsg->bulk_in_enabled = 1;
3180
3181 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3182 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3183 goto reset;
3184 fsg->bulk_out_enabled = 1;
3185 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3186
3187 if (transport_is_cbi()) {
3188 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3189 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3190 goto reset;
3191 fsg->intr_in_enabled = 1;
3192 }
3193
3194 /* Allocate the requests */
3195 for (i = 0; i < NUM_BUFFERS; ++i) {
3196 struct fsg_buffhd *bh = &fsg->buffhds[i];
3197
3198 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3199 goto reset;
3200 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3201 goto reset;
3202 bh->inreq->buf = bh->outreq->buf = bh->buf;
3203 bh->inreq->dma = bh->outreq->dma = bh->dma;
3204 bh->inreq->context = bh->outreq->context = bh;
3205 bh->inreq->complete = bulk_in_complete;
3206 bh->outreq->complete = bulk_out_complete;
3207 }
3208 if (transport_is_cbi()) {
3209 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3210 goto reset;
3211 fsg->intreq->complete = intr_in_complete;
3212 }
3213
3214 fsg->running = 1;
3215 for (i = 0; i < fsg->nluns; ++i)
3216 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3217 return rc;
3218 }
3219
3220
3221 /*
3222 * Change our operational configuration. This code must agree with the code
3223 * that returns config descriptors, and with interface altsetting code.
3224 *
3225 * It's also responsible for power management interactions. Some
3226 * configurations might not work with our current power sources.
3227 * For now we just assume the gadget is always self-powered.
3228 */
3229 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3230 {
3231 int rc = 0;
3232
3233 /* Disable the single interface */
3234 if (fsg->config != 0) {
3235 DBG(fsg, "reset config\n");
3236 fsg->config = 0;
3237 rc = do_set_interface(fsg, -1);
3238 }
3239
3240 /* Enable the interface */
3241 if (new_config != 0) {
3242 fsg->config = new_config;
3243 if ((rc = do_set_interface(fsg, 0)) != 0)
3244 fsg->config = 0; // Reset on errors
3245 else {
3246 char *speed;
3247
3248 switch (fsg->gadget->speed) {
3249 case USB_SPEED_LOW: speed = "low"; break;
3250 case USB_SPEED_FULL: speed = "full"; break;
3251 case USB_SPEED_HIGH: speed = "high"; break;
3252 default: speed = "?"; break;
3253 }
3254 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3255 }
3256 }
3257 return rc;
3258 }
3259
3260
3261 /*-------------------------------------------------------------------------*/
3262
3263 static void handle_exception(struct fsg_dev *fsg)
3264 {
3265 siginfo_t info;
3266 int sig;
3267 int i;
3268 int num_active;
3269 struct fsg_buffhd *bh;
3270 enum fsg_state old_state;
3271 u8 new_config;
3272 struct lun *curlun;
3273 unsigned int exception_req_tag;
3274 int rc;
3275
3276 /* Clear the existing signals. Anything but SIGUSR1 is converted
3277 * into a high-priority EXIT exception. */
3278 for (;;) {
3279 sig = dequeue_signal_lock(current, &current->blocked, &info);
3280 if (!sig)
3281 break;
3282 if (sig != SIGUSR1) {
3283 if (fsg->state < FSG_STATE_EXIT)
3284 DBG(fsg, "Main thread exiting on signal\n");
3285 raise_exception(fsg, FSG_STATE_EXIT);
3286 }
3287 }
3288
3289 /* Cancel all the pending transfers */
3290 if (fsg->intreq_busy)
3291 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3292 for (i = 0; i < NUM_BUFFERS; ++i) {
3293 bh = &fsg->buffhds[i];
3294 if (bh->inreq_busy)
3295 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3296 if (bh->outreq_busy)
3297 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3298 }
3299
3300 /* Wait until everything is idle */
3301 for (;;) {
3302 num_active = fsg->intreq_busy;
3303 for (i = 0; i < NUM_BUFFERS; ++i) {
3304 bh = &fsg->buffhds[i];
3305 num_active += bh->inreq_busy + bh->outreq_busy;
3306 }
3307 if (num_active == 0)
3308 break;
3309 if (sleep_thread(fsg))
3310 return;
3311 }
3312
3313 /* Clear out the controller's fifos */
3314 if (fsg->bulk_in_enabled)
3315 usb_ep_fifo_flush(fsg->bulk_in);
3316 if (fsg->bulk_out_enabled)
3317 usb_ep_fifo_flush(fsg->bulk_out);
3318 if (fsg->intr_in_enabled)
3319 usb_ep_fifo_flush(fsg->intr_in);
3320
3321 /* Reset the I/O buffer states and pointers, the SCSI
3322 * state, and the exception. Then invoke the handler. */
3323 spin_lock_irq(&fsg->lock);
3324
3325 for (i = 0; i < NUM_BUFFERS; ++i) {
3326 bh = &fsg->buffhds[i];
3327 bh->state = BUF_STATE_EMPTY;
3328 }
3329 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3330 &fsg->buffhds[0];
3331
3332 exception_req_tag = fsg->exception_req_tag;
3333 new_config = fsg->new_config;
3334 old_state = fsg->state;
3335
3336 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3337 fsg->state = FSG_STATE_STATUS_PHASE;
3338 else {
3339 for (i = 0; i < fsg->nluns; ++i) {
3340 curlun = &fsg->luns[i];
3341 curlun->prevent_medium_removal = 0;
3342 curlun->sense_data = curlun->unit_attention_data =
3343 SS_NO_SENSE;
3344 curlun->sense_data_info = 0;
3345 curlun->info_valid = 0;
3346 }
3347 fsg->state = FSG_STATE_IDLE;
3348 }
3349 spin_unlock_irq(&fsg->lock);
3350
3351 /* Carry out any extra actions required for the exception */
3352 switch (old_state) {
3353 default:
3354 break;
3355
3356 case FSG_STATE_ABORT_BULK_OUT:
3357 send_status(fsg);
3358 spin_lock_irq(&fsg->lock);
3359 if (fsg->state == FSG_STATE_STATUS_PHASE)
3360 fsg->state = FSG_STATE_IDLE;
3361 spin_unlock_irq(&fsg->lock);
3362 break;
3363
3364 case FSG_STATE_RESET:
3365 /* In case we were forced against our will to halt a
3366 * bulk endpoint, clear the halt now. (The SuperH UDC
3367 * requires this.) */
3368 if (test_and_clear_bit(CLEAR_BULK_HALTS,
3369 &fsg->atomic_bitflags)) {
3370 usb_ep_clear_halt(fsg->bulk_in);
3371 usb_ep_clear_halt(fsg->bulk_out);
3372 }
3373
3374 if (transport_is_bbb()) {
3375 if (fsg->ep0_req_tag == exception_req_tag)
3376 ep0_queue(fsg); // Complete the status stage
3377
3378 } else if (transport_is_cbi())
3379 send_status(fsg); // Status by interrupt pipe
3380
3381 /* Technically this should go here, but it would only be
3382 * a waste of time. Ditto for the INTERFACE_CHANGE and
3383 * CONFIG_CHANGE cases. */
3384 // for (i = 0; i < fsg->nluns; ++i)
3385 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3386 break;
3387
3388 case FSG_STATE_INTERFACE_CHANGE:
3389 rc = do_set_interface(fsg, 0);
3390 if (fsg->ep0_req_tag != exception_req_tag)
3391 break;
3392 if (rc != 0) // STALL on errors
3393 fsg_set_halt(fsg, fsg->ep0);
3394 else // Complete the status stage
3395 ep0_queue(fsg);
3396 break;
3397
3398 case FSG_STATE_CONFIG_CHANGE:
3399 rc = do_set_config(fsg, new_config);
3400 if (fsg->ep0_req_tag != exception_req_tag)
3401 break;
3402 if (rc != 0) // STALL on errors
3403 fsg_set_halt(fsg, fsg->ep0);
3404 else // Complete the status stage
3405 ep0_queue(fsg);
3406 break;
3407
3408 case FSG_STATE_DISCONNECT:
3409 fsync_all(fsg);
3410 do_set_config(fsg, 0); // Unconfigured state
3411 break;
3412
3413 case FSG_STATE_EXIT:
3414 case FSG_STATE_TERMINATED:
3415 do_set_config(fsg, 0); // Free resources
3416 spin_lock_irq(&fsg->lock);
3417 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3418 spin_unlock_irq(&fsg->lock);
3419 break;
3420 }
3421 }
3422
3423
3424 /*-------------------------------------------------------------------------*/
3425
3426 static int fsg_main_thread(void *fsg_)
3427 {
3428 struct fsg_dev *fsg = fsg_;
3429
3430 /* Allow the thread to be killed by a signal, but set the signal mask
3431 * to block everything but INT, TERM, KILL, and USR1. */
3432 allow_signal(SIGINT);
3433 allow_signal(SIGTERM);
3434 allow_signal(SIGKILL);
3435 allow_signal(SIGUSR1);
3436
3437 /* Allow the thread to be frozen */
3438 set_freezable();
3439
3440 /* Arrange for userspace references to be interpreted as kernel
3441 * pointers. That way we can pass a kernel pointer to a routine
3442 * that expects a __user pointer and it will work okay. */
3443 set_fs(get_ds());
3444
3445 /* The main loop */
3446 while (fsg->state != FSG_STATE_TERMINATED) {
3447 if (exception_in_progress(fsg) || signal_pending(current)) {
3448 handle_exception(fsg);
3449 continue;
3450 }
3451
3452 if (!fsg->running) {
3453 sleep_thread(fsg);
3454 continue;
3455 }
3456
3457 if (get_next_command(fsg))
3458 continue;
3459
3460 spin_lock_irq(&fsg->lock);
3461 if (!exception_in_progress(fsg))
3462 fsg->state = FSG_STATE_DATA_PHASE;
3463 spin_unlock_irq(&fsg->lock);
3464
3465 if (do_scsi_command(fsg) || finish_reply(fsg))
3466 continue;
3467
3468 spin_lock_irq(&fsg->lock);
3469 if (!exception_in_progress(fsg))
3470 fsg->state = FSG_STATE_STATUS_PHASE;
3471 spin_unlock_irq(&fsg->lock);
3472
3473 if (send_status(fsg))
3474 continue;
3475
3476 spin_lock_irq(&fsg->lock);
3477 if (!exception_in_progress(fsg))
3478 fsg->state = FSG_STATE_IDLE;
3479 spin_unlock_irq(&fsg->lock);
3480 }
3481
3482 spin_lock_irq(&fsg->lock);
3483 fsg->thread_task = NULL;
3484 spin_unlock_irq(&fsg->lock);
3485
3486 /* In case we are exiting because of a signal, unregister the
3487 * gadget driver and close the backing file. */
3488 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3489 usb_gadget_unregister_driver(&fsg_driver);
3490 close_all_backing_files(fsg);
3491 }
3492
3493 /* Let the unbind and cleanup routines know the thread has exited */
3494 complete_and_exit(&fsg->thread_notifier, 0);
3495 }
3496
3497
3498 /*-------------------------------------------------------------------------*/
3499
3500 /* If the next two routines are called while the gadget is registered,
3501 * the caller must own fsg->filesem for writing. */
3502
3503 static int open_backing_file(struct lun *curlun, const char *filename)
3504 {
3505 int ro;
3506 struct file *filp = NULL;
3507 int rc = -EINVAL;
3508 struct inode *inode = NULL;
3509 loff_t size;
3510 loff_t num_sectors;
3511
3512 /* R/W if we can, R/O if we must */
3513 ro = curlun->ro;
3514 if (!ro) {
3515 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3516 if (-EROFS == PTR_ERR(filp))
3517 ro = 1;
3518 }
3519 if (ro)
3520 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3521 if (IS_ERR(filp)) {
3522 LINFO(curlun, "unable to open backing file: %s\n", filename);
3523 return PTR_ERR(filp);
3524 }
3525
3526 if (!(filp->f_mode & FMODE_WRITE))
3527 ro = 1;
3528
3529 if (filp->f_path.dentry)
3530 inode = filp->f_path.dentry->d_inode;
3531 if (inode && S_ISBLK(inode->i_mode)) {
3532 if (bdev_read_only(inode->i_bdev))
3533 ro = 1;
3534 } else if (!inode || !S_ISREG(inode->i_mode)) {
3535 LINFO(curlun, "invalid file type: %s\n", filename);
3536 goto out;
3537 }
3538
3539 /* If we can't read the file, it's no good.
3540 * If we can't write the file, use it read-only. */
3541 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3542 LINFO(curlun, "file not readable: %s\n", filename);
3543 goto out;
3544 }
3545 if (!(filp->f_op->write || filp->f_op->aio_write))
3546 ro = 1;
3547
3548 size = i_size_read(inode->i_mapping->host);
3549 if (size < 0) {
3550 LINFO(curlun, "unable to find file size: %s\n", filename);
3551 rc = (int) size;
3552 goto out;
3553 }
3554 num_sectors = size >> 9; // File size in 512-byte sectors
3555 if (num_sectors == 0) {
3556 LINFO(curlun, "file too small: %s\n", filename);
3557 rc = -ETOOSMALL;
3558 goto out;
3559 }
3560
3561 get_file(filp);
3562 curlun->ro = ro;
3563 curlun->filp = filp;
3564 curlun->file_length = size;
3565 curlun->num_sectors = num_sectors;
3566 LDBG(curlun, "open backing file: %s\n", filename);
3567 rc = 0;
3568
3569 out:
3570 filp_close(filp, current->files);
3571 return rc;
3572 }
3573
3574
3575 static void close_backing_file(struct lun *curlun)
3576 {
3577 if (curlun->filp) {
3578 LDBG(curlun, "close backing file\n");
3579 fput(curlun->filp);
3580 curlun->filp = NULL;
3581 }
3582 }
3583
3584 static void close_all_backing_files(struct fsg_dev *fsg)
3585 {
3586 int i;
3587
3588 for (i = 0; i < fsg->nluns; ++i)
3589 close_backing_file(&fsg->luns[i]);
3590 }
3591
3592
3593 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3594 {
3595 struct lun *curlun = dev_to_lun(dev);
3596
3597 return sprintf(buf, "%d\n", curlun->ro);
3598 }
3599
3600 static ssize_t show_file(struct device *dev, struct device_attribute *attr, char *buf)
3601 {
3602 struct lun *curlun = dev_to_lun(dev);
3603 struct fsg_dev *fsg = dev_get_drvdata(dev);
3604 char *p;
3605 ssize_t rc;
3606
3607 down_read(&fsg->filesem);
3608 if (backing_file_is_open(curlun)) { // Get the complete pathname
3609 p = d_path(curlun->filp->f_path.dentry, curlun->filp->f_path.mnt,
3610 buf, PAGE_SIZE - 1);
3611 if (IS_ERR(p))
3612 rc = PTR_ERR(p);
3613 else {
3614 rc = strlen(p);
3615 memmove(buf, p, rc);
3616 buf[rc] = '\n'; // Add a newline
3617 buf[++rc] = 0;
3618 }
3619 } else { // No file, return 0 bytes
3620 *buf = 0;
3621 rc = 0;
3622 }
3623 up_read(&fsg->filesem);
3624 return rc;
3625 }
3626
3627
3628 static ssize_t store_ro(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3629 {
3630 ssize_t rc = count;
3631 struct lun *curlun = dev_to_lun(dev);
3632 struct fsg_dev *fsg = dev_get_drvdata(dev);
3633 int i;
3634
3635 if (sscanf(buf, "%d", &i) != 1)
3636 return -EINVAL;
3637
3638 /* Allow the write-enable status to change only while the backing file
3639 * is closed. */
3640 down_read(&fsg->filesem);
3641 if (backing_file_is_open(curlun)) {
3642 LDBG(curlun, "read-only status change prevented\n");
3643 rc = -EBUSY;
3644 } else {
3645 curlun->ro = !!i;
3646 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3647 }
3648 up_read(&fsg->filesem);
3649 return rc;
3650 }
3651
3652 static ssize_t store_file(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3653 {
3654 struct lun *curlun = dev_to_lun(dev);
3655 struct fsg_dev *fsg = dev_get_drvdata(dev);
3656 int rc = 0;
3657
3658 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3659 LDBG(curlun, "eject attempt prevented\n");
3660 return -EBUSY; // "Door is locked"
3661 }
3662
3663 /* Remove a trailing newline */
3664 if (count > 0 && buf[count-1] == '\n')
3665 ((char *) buf)[count-1] = 0; // Ugh!
3666
3667 /* Eject current medium */
3668 down_write(&fsg->filesem);
3669 if (backing_file_is_open(curlun)) {
3670 close_backing_file(curlun);
3671 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3672 }
3673
3674 /* Load new medium */
3675 if (count > 0 && buf[0]) {
3676 rc = open_backing_file(curlun, buf);
3677 if (rc == 0)
3678 curlun->unit_attention_data =
3679 SS_NOT_READY_TO_READY_TRANSITION;
3680 }
3681 up_write(&fsg->filesem);
3682 return (rc < 0 ? rc : count);
3683 }
3684
3685
3686 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3687 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3688 static DEVICE_ATTR(file, 0444, show_file, NULL);
3689
3690
3691 /*-------------------------------------------------------------------------*/
3692
3693 static void fsg_release(struct kref *ref)
3694 {
3695 struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
3696
3697 kfree(fsg->luns);
3698 kfree(fsg);
3699 }
3700
3701 static void lun_release(struct device *dev)
3702 {
3703 struct fsg_dev *fsg = dev_get_drvdata(dev);
3704
3705 kref_put(&fsg->ref, fsg_release);
3706 }
3707
3708 static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
3709 {
3710 struct fsg_dev *fsg = get_gadget_data(gadget);
3711 int i;
3712 struct lun *curlun;
3713 struct usb_request *req = fsg->ep0req;
3714
3715 DBG(fsg, "unbind\n");
3716 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3717
3718 /* Unregister the sysfs attribute files and the LUNs */
3719 for (i = 0; i < fsg->nluns; ++i) {
3720 curlun = &fsg->luns[i];
3721 if (curlun->registered) {
3722 device_remove_file(&curlun->dev, &dev_attr_ro);
3723 device_remove_file(&curlun->dev, &dev_attr_file);
3724 device_unregister(&curlun->dev);
3725 curlun->registered = 0;
3726 }
3727 }
3728
3729 /* If the thread isn't already dead, tell it to exit now */
3730 if (fsg->state != FSG_STATE_TERMINATED) {
3731 raise_exception(fsg, FSG_STATE_EXIT);
3732 wait_for_completion(&fsg->thread_notifier);
3733
3734 /* The cleanup routine waits for this completion also */
3735 complete(&fsg->thread_notifier);
3736 }
3737
3738 /* Free the data buffers */
3739 for (i = 0; i < NUM_BUFFERS; ++i)
3740 kfree(fsg->buffhds[i].buf);
3741
3742 /* Free the request and buffer for endpoint 0 */
3743 if (req) {
3744 kfree(req->buf);
3745 usb_ep_free_request(fsg->ep0, req);
3746 }
3747
3748 set_gadget_data(gadget, NULL);
3749 }
3750
3751
3752 static int __init check_parameters(struct fsg_dev *fsg)
3753 {
3754 int prot;
3755 int gcnum;
3756
3757 /* Store the default values */
3758 mod_data.transport_type = USB_PR_BULK;
3759 mod_data.transport_name = "Bulk-only";
3760 mod_data.protocol_type = USB_SC_SCSI;
3761 mod_data.protocol_name = "Transparent SCSI";
3762
3763 if (gadget_is_sh(fsg->gadget))
3764 mod_data.can_stall = 0;
3765
3766 if (mod_data.release == 0xffff) { // Parameter wasn't set
3767 /* The sa1100 controller is not supported */
3768 if (gadget_is_sa1100(fsg->gadget))
3769 gcnum = -1;
3770 else
3771 gcnum = usb_gadget_controller_number(fsg->gadget);
3772 if (gcnum >= 0)
3773 mod_data.release = 0x0300 + gcnum;
3774 else {
3775 WARN(fsg, "controller '%s' not recognized\n",
3776 fsg->gadget->name);
3777 mod_data.release = 0x0399;
3778 }
3779 }
3780
3781 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3782
3783 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3784 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3785 ; // Use default setting
3786 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3787 mod_data.transport_type = USB_PR_CB;
3788 mod_data.transport_name = "Control-Bulk";
3789 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3790 mod_data.transport_type = USB_PR_CBI;
3791 mod_data.transport_name = "Control-Bulk-Interrupt";
3792 } else {
3793 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3794 return -EINVAL;
3795 }
3796
3797 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3798 prot == USB_SC_SCSI) {
3799 ; // Use default setting
3800 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3801 prot == USB_SC_RBC) {
3802 mod_data.protocol_type = USB_SC_RBC;
3803 mod_data.protocol_name = "RBC";
3804 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3805 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3806 prot == USB_SC_8020) {
3807 mod_data.protocol_type = USB_SC_8020;
3808 mod_data.protocol_name = "8020i (ATAPI)";
3809 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3810 prot == USB_SC_QIC) {
3811 mod_data.protocol_type = USB_SC_QIC;
3812 mod_data.protocol_name = "QIC-157";
3813 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3814 prot == USB_SC_UFI) {
3815 mod_data.protocol_type = USB_SC_UFI;
3816 mod_data.protocol_name = "UFI";
3817 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3818 prot == USB_SC_8070) {
3819 mod_data.protocol_type = USB_SC_8070;
3820 mod_data.protocol_name = "8070i";
3821 } else {
3822 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3823 return -EINVAL;
3824 }
3825
3826 mod_data.buflen &= PAGE_CACHE_MASK;
3827 if (mod_data.buflen <= 0) {
3828 ERROR(fsg, "invalid buflen\n");
3829 return -ETOOSMALL;
3830 }
3831 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3832
3833 return 0;
3834 }
3835
3836
3837 static int __init fsg_bind(struct usb_gadget *gadget)
3838 {
3839 struct fsg_dev *fsg = the_fsg;
3840 int rc;
3841 int i;
3842 struct lun *curlun;
3843 struct usb_ep *ep;
3844 struct usb_request *req;
3845 char *pathbuf, *p;
3846
3847 fsg->gadget = gadget;
3848 set_gadget_data(gadget, fsg);
3849 fsg->ep0 = gadget->ep0;
3850 fsg->ep0->driver_data = fsg;
3851
3852 if ((rc = check_parameters(fsg)) != 0)
3853 goto out;
3854
3855 if (mod_data.removable) { // Enable the store_xxx attributes
3856 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3857 dev_attr_ro.store = store_ro;
3858 dev_attr_file.store = store_file;
3859 }
3860
3861 /* Find out how many LUNs there should be */
3862 i = mod_data.nluns;
3863 if (i == 0)
3864 i = max(mod_data.num_filenames, 1);
3865 if (i > MAX_LUNS) {
3866 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3867 rc = -EINVAL;
3868 goto out;
3869 }
3870
3871 /* Create the LUNs, open their backing files, and register the
3872 * LUN devices in sysfs. */
3873 fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
3874 if (!fsg->luns) {
3875 rc = -ENOMEM;
3876 goto out;
3877 }
3878 fsg->nluns = i;
3879
3880 for (i = 0; i < fsg->nluns; ++i) {
3881 curlun = &fsg->luns[i];
3882 curlun->ro = mod_data.ro[i];
3883 curlun->dev.release = lun_release;
3884 curlun->dev.parent = &gadget->dev;
3885 curlun->dev.driver = &fsg_driver.driver;
3886 dev_set_drvdata(&curlun->dev, fsg);
3887 snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3888 "%s-lun%d", gadget->dev.bus_id, i);
3889
3890 if ((rc = device_register(&curlun->dev)) != 0) {
3891 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3892 goto out;
3893 }
3894 if ((rc = device_create_file(&curlun->dev,
3895 &dev_attr_ro)) != 0 ||
3896 (rc = device_create_file(&curlun->dev,
3897 &dev_attr_file)) != 0) {
3898 device_unregister(&curlun->dev);
3899 goto out;
3900 }
3901 curlun->registered = 1;
3902 kref_get(&fsg->ref);
3903
3904 if (mod_data.file[i] && *mod_data.file[i]) {
3905 if ((rc = open_backing_file(curlun,
3906 mod_data.file[i])) != 0)
3907 goto out;
3908 } else if (!mod_data.removable) {
3909 ERROR(fsg, "no file given for LUN%d\n", i);
3910 rc = -EINVAL;
3911 goto out;
3912 }
3913 }
3914
3915 /* Find all the endpoints we will use */
3916 usb_ep_autoconfig_reset(gadget);
3917 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3918 if (!ep)
3919 goto autoconf_fail;
3920 ep->driver_data = fsg; // claim the endpoint
3921 fsg->bulk_in = ep;
3922
3923 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3924 if (!ep)
3925 goto autoconf_fail;
3926 ep->driver_data = fsg; // claim the endpoint
3927 fsg->bulk_out = ep;
3928
3929 if (transport_is_cbi()) {
3930 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3931 if (!ep)
3932 goto autoconf_fail;
3933 ep->driver_data = fsg; // claim the endpoint
3934 fsg->intr_in = ep;
3935 }
3936
3937 /* Fix up the descriptors */
3938 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3939 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3940 device_desc.idProduct = cpu_to_le16(mod_data.product);
3941 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3942
3943 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3944 intf_desc.bNumEndpoints = i;
3945 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3946 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3947 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3948
3949 #ifdef CONFIG_USB_GADGET_DUALSPEED
3950 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3951
3952 /* Assume ep0 uses the same maxpacket value for both speeds */
3953 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3954
3955 /* Assume that all endpoint addresses are the same for both speeds */
3956 hs_bulk_in_desc.bEndpointAddress = fs_bulk_in_desc.bEndpointAddress;
3957 hs_bulk_out_desc.bEndpointAddress = fs_bulk_out_desc.bEndpointAddress;
3958 hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
3959 #endif
3960
3961 if (gadget->is_otg) {
3962 otg_desc.bmAttributes |= USB_OTG_HNP;
3963 }
3964
3965 rc = -ENOMEM;
3966
3967 /* Allocate the request and buffer for endpoint 0 */
3968 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3969 if (!req)
3970 goto out;
3971 req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL);
3972 if (!req->buf)
3973 goto out;
3974 req->complete = ep0_complete;
3975
3976 /* Allocate the data buffers */
3977 for (i = 0; i < NUM_BUFFERS; ++i) {
3978 struct fsg_buffhd *bh = &fsg->buffhds[i];
3979
3980 /* Allocate for the bulk-in endpoint. We assume that
3981 * the buffer will also work with the bulk-out (and
3982 * interrupt-in) endpoint. */
3983 bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL);
3984 if (!bh->buf)
3985 goto out;
3986 bh->next = bh + 1;
3987 }
3988 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3989
3990 /* This should reflect the actual gadget power source */
3991 usb_gadget_set_selfpowered(gadget);
3992
3993 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3994 init_utsname()->sysname, init_utsname()->release,
3995 gadget->name);
3996
3997 /* On a real device, serial[] would be loaded from permanent
3998 * storage. We just encode it from the driver version string. */
3999 for (i = 0; i < sizeof(serial) - 2; i += 2) {
4000 unsigned char c = DRIVER_VERSION[i / 2];
4001
4002 if (!c)
4003 break;
4004 sprintf(&serial[i], "%02X", c);
4005 }
4006
4007 fsg->thread_task = kthread_create(fsg_main_thread, fsg,
4008 "file-storage-gadget");
4009 if (IS_ERR(fsg->thread_task)) {
4010 rc = PTR_ERR(fsg->thread_task);
4011 goto out;
4012 }
4013
4014 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
4015 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
4016
4017 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
4018 for (i = 0; i < fsg->nluns; ++i) {
4019 curlun = &fsg->luns[i];
4020 if (backing_file_is_open(curlun)) {
4021 p = NULL;
4022 if (pathbuf) {
4023 p = d_path(curlun->filp->f_path.dentry,
4024 curlun->filp->f_path.mnt,
4025 pathbuf, PATH_MAX);
4026 if (IS_ERR(p))
4027 p = NULL;
4028 }
4029 LINFO(curlun, "ro=%d, file: %s\n",
4030 curlun->ro, (p ? p : "(error)"));
4031 }
4032 }
4033 kfree(pathbuf);
4034
4035 DBG(fsg, "transport=%s (x%02x)\n",
4036 mod_data.transport_name, mod_data.transport_type);
4037 DBG(fsg, "protocol=%s (x%02x)\n",
4038 mod_data.protocol_name, mod_data.protocol_type);
4039 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4040 mod_data.vendor, mod_data.product, mod_data.release);
4041 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
4042 mod_data.removable, mod_data.can_stall,
4043 mod_data.buflen);
4044 DBG(fsg, "I/O thread pid: %d\n", fsg->thread_task->pid);
4045
4046 set_bit(REGISTERED, &fsg->atomic_bitflags);
4047
4048 /* Tell the thread to start working */
4049 wake_up_process(fsg->thread_task);
4050 return 0;
4051
4052 autoconf_fail:
4053 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4054 rc = -ENOTSUPP;
4055
4056 out:
4057 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4058 fsg_unbind(gadget);
4059 close_all_backing_files(fsg);
4060 return rc;
4061 }
4062
4063
4064 /*-------------------------------------------------------------------------*/
4065
4066 static void fsg_suspend(struct usb_gadget *gadget)
4067 {
4068 struct fsg_dev *fsg = get_gadget_data(gadget);
4069
4070 DBG(fsg, "suspend\n");
4071 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4072 }
4073
4074 static void fsg_resume(struct usb_gadget *gadget)
4075 {
4076 struct fsg_dev *fsg = get_gadget_data(gadget);
4077
4078 DBG(fsg, "resume\n");
4079 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4080 }
4081
4082
4083 /*-------------------------------------------------------------------------*/
4084
4085 static struct usb_gadget_driver fsg_driver = {
4086 #ifdef CONFIG_USB_GADGET_DUALSPEED
4087 .speed = USB_SPEED_HIGH,
4088 #else
4089 .speed = USB_SPEED_FULL,
4090 #endif
4091 .function = (char *) longname,
4092 .bind = fsg_bind,
4093 .unbind = fsg_unbind,
4094 .disconnect = fsg_disconnect,
4095 .setup = fsg_setup,
4096 .suspend = fsg_suspend,
4097 .resume = fsg_resume,
4098
4099 .driver = {
4100 .name = (char *) shortname,
4101 .owner = THIS_MODULE,
4102 // .release = ...
4103 // .suspend = ...
4104 // .resume = ...
4105 },
4106 };
4107
4108
4109 static int __init fsg_alloc(void)
4110 {
4111 struct fsg_dev *fsg;
4112
4113 fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
4114 if (!fsg)
4115 return -ENOMEM;
4116 spin_lock_init(&fsg->lock);
4117 init_rwsem(&fsg->filesem);
4118 kref_init(&fsg->ref);
4119 init_completion(&fsg->thread_notifier);
4120
4121 the_fsg = fsg;
4122 return 0;
4123 }
4124
4125
4126 static int __init fsg_init(void)
4127 {
4128 int rc;
4129 struct fsg_dev *fsg;
4130
4131 if ((rc = fsg_alloc()) != 0)
4132 return rc;
4133 fsg = the_fsg;
4134 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0)
4135 kref_put(&fsg->ref, fsg_release);
4136 return rc;
4137 }
4138 module_init(fsg_init);
4139
4140
4141 static void __exit fsg_cleanup(void)
4142 {
4143 struct fsg_dev *fsg = the_fsg;
4144
4145 /* Unregister the driver iff the thread hasn't already done so */
4146 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4147 usb_gadget_unregister_driver(&fsg_driver);
4148
4149 /* Wait for the thread to finish up */
4150 wait_for_completion(&fsg->thread_notifier);
4151
4152 close_all_backing_files(fsg);
4153 kref_put(&fsg->ref, fsg_release);
4154 }
4155 module_exit(fsg_cleanup);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree