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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/gadget/file_storage.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
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1/*
2 * file_storage.c -- File-backed USB Storage Gadget, for USB development
3 *
4 * Copyright (C) 2003-2005 Alan Stern
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The names of the above-listed copyright holders may not be used
17 * to endorse or promote products derived from this software without
18 * specific prior written permission.
19 *
20 * ALTERNATIVELY, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") as published by the Free Software
22 * Foundation, either version 2 of that License or (at your option) any
23 * later version.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
26 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
27 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38
39/*
40 * The File-backed Storage Gadget acts as a USB Mass Storage device,
41 * appearing to the host as a disk drive. In addition to providing an
42 * example of a genuinely useful gadget driver for a USB device, it also
43 * illustrates a technique of double-buffering for increased throughput.
44 * Last but not least, it gives an easy way to probe the behavior of the
45 * Mass Storage drivers in a USB host.
46 *
47 * Backing storage is provided by a regular file or a block device, specified
48 * by the "file" module parameter. Access can be limited to read-only by
49 * setting the optional "ro" module parameter. The gadget will indicate that
50 * it has removable media if the optional "removable" module parameter is set.
51 *
52 * The gadget supports the Control-Bulk (CB), Control-Bulk-Interrupt (CBI),
53 * and Bulk-Only (also known as Bulk-Bulk-Bulk or BBB) transports, selected
54 * by the optional "transport" module parameter. It also supports the
55 * following protocols: RBC (0x01), ATAPI or SFF-8020i (0x02), QIC-157 (0c03),
56 * UFI (0x04), SFF-8070i (0x05), and transparent SCSI (0x06), selected by
57 * the optional "protocol" module parameter. In addition, the default
58 * Vendor ID, Product ID, and release number can be overridden.
59 *
60 * There is support for multiple logical units (LUNs), each of which has
61 * its own backing file. The number of LUNs can be set using the optional
62 * "luns" module parameter (anywhere from 1 to 8), and the corresponding
63 * files are specified using comma-separated lists for "file" and "ro".
64 * The default number of LUNs is taken from the number of "file" elements;
65 * it is 1 if "file" is not given. If "removable" is not set then a backing
66 * file must be specified for each LUN. If it is set, then an unspecified
67 * or empty backing filename means the LUN's medium is not loaded.
68 *
69 * Requirements are modest; only a bulk-in and a bulk-out endpoint are
70 * needed (an interrupt-out endpoint is also needed for CBI). The memory
71 * requirement amounts to two 16K buffers, size configurable by a parameter.
72 * Support is included for both full-speed and high-speed operation.
73 *
74 * Module options:
75 *
76 * file=filename[,filename...]
77 * Required if "removable" is not set, names of
78 * the files or block devices used for
79 * backing storage
80 * ro=b[,b...] Default false, booleans for read-only access
81 * removable Default false, boolean for removable media
82 * luns=N Default N = number of filenames, number of
83 * LUNs to support
84 * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
85 * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
86 * ATAPI, QIC, UFI, 8070, or SCSI;
87 * also 1 - 6)
88 * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
89 * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
90 * release=0xRRRR Override the USB release number (bcdDevice)
91 * buflen=N Default N=16384, buffer size used (will be
92 * rounded down to a multiple of
93 * PAGE_CACHE_SIZE)
94 * stall Default determined according to the type of
95 * USB device controller (usually true),
96 * boolean to permit the driver to halt
97 * bulk endpoints
98 *
99 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
100 * "removable", and "luns" options are available; default values are used
101 * for everything else.
102 *
103 * The pathnames of the backing files and the ro settings are available in
104 * the attribute files "file" and "ro" in the lun<n> subdirectory of the
105 * gadget's sysfs directory. If the "removable" option is set, writing to
106 * these files will simulate ejecting/loading the medium (writing an empty
107 * line means eject) and adjusting a write-enable tab. Changes to the ro
108 * setting are not allowed when the medium is loaded.
109 *
110 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
111 */
112
113
114/*
115 * Driver Design
116 *
117 * The FSG driver is fairly straightforward. There is a main kernel
118 * thread that handles most of the work. Interrupt routines field
119 * callbacks from the controller driver: bulk- and interrupt-request
120 * completion notifications, endpoint-0 events, and disconnect events.
121 * Completion events are passed to the main thread by wakeup calls. Many
122 * ep0 requests are handled at interrupt time, but SetInterface,
123 * SetConfiguration, and device reset requests are forwarded to the
124 * thread in the form of "exceptions" using SIGUSR1 signals (since they
125 * should interrupt any ongoing file I/O operations).
126 *
127 * The thread's main routine implements the standard command/data/status
128 * parts of a SCSI interaction. It and its subroutines are full of tests
129 * for pending signals/exceptions -- all this polling is necessary since
130 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
131 * indication that the driver really wants to be running in userspace.)
132 * An important point is that so long as the thread is alive it keeps an
133 * open reference to the backing file. This will prevent unmounting
134 * the backing file's underlying filesystem and could cause problems
135 * during system shutdown, for example. To prevent such problems, the
136 * thread catches INT, TERM, and KILL signals and converts them into
137 * an EXIT exception.
138 *
139 * In normal operation the main thread is started during the gadget's
140 * fsg_bind() callback and stopped during fsg_unbind(). But it can also
141 * exit when it receives a signal, and there's no point leaving the
142 * gadget running when the thread is dead. So just before the thread
143 * exits, it deregisters the gadget driver. This makes things a little
144 * tricky: The driver is deregistered at two places, and the exiting
145 * thread can indirectly call fsg_unbind() which in turn can tell the
146 * thread to exit. The first problem is resolved through the use of the
147 * REGISTERED atomic bitflag; the driver will only be deregistered once.
148 * The second problem is resolved by having fsg_unbind() check
149 * fsg->state; it won't try to stop the thread if the state is already
150 * FSG_STATE_TERMINATED.
151 *
152 * To provide maximum throughput, the driver uses a circular pipeline of
153 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
154 * arbitrarily long; in practice the benefits don't justify having more
155 * than 2 stages (i.e., double buffering). But it helps to think of the
156 * pipeline as being a long one. Each buffer head contains a bulk-in and
157 * a bulk-out request pointer (since the buffer can be used for both
158 * output and input -- directions always are given from the host's
159 * point of view) as well as a pointer to the buffer and various state
160 * variables.
161 *
162 * Use of the pipeline follows a simple protocol. There is a variable
163 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
164 * At any time that buffer head may still be in use from an earlier
165 * request, so each buffer head has a state variable indicating whether
166 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
167 * buffer head to be EMPTY, filling the buffer either by file I/O or by
168 * USB I/O (during which the buffer head is BUSY), and marking the buffer
169 * head FULL when the I/O is complete. Then the buffer will be emptied
170 * (again possibly by USB I/O, during which it is marked BUSY) and
171 * finally marked EMPTY again (possibly by a completion routine).
172 *
173 * A module parameter tells the driver to avoid stalling the bulk
174 * endpoints wherever the transport specification allows. This is
175 * necessary for some UDCs like the SuperH, which cannot reliably clear a
176 * halt on a bulk endpoint. However, under certain circumstances the
177 * Bulk-only specification requires a stall. In such cases the driver
178 * will halt the endpoint and set a flag indicating that it should clear
179 * the halt in software during the next device reset. Hopefully this
180 * will permit everything to work correctly. Furthermore, although the
181 * specification allows the bulk-out endpoint to halt when the host sends
182 * too much data, implementing this would cause an unavoidable race.
183 * The driver will always use the "no-stall" approach for OUT transfers.
184 *
185 * One subtle point concerns sending status-stage responses for ep0
186 * requests. Some of these requests, such as device reset, can involve
187 * interrupting an ongoing file I/O operation, which might take an
188 * arbitrarily long time. During that delay the host might give up on
189 * the original ep0 request and issue a new one. When that happens the
190 * driver should not notify the host about completion of the original
191 * request, as the host will no longer be waiting for it. So the driver
192 * assigns to each ep0 request a unique tag, and it keeps track of the
193 * tag value of the request associated with a long-running exception
194 * (device-reset, interface-change, or configuration-change). When the
195 * exception handler is finished, the status-stage response is submitted
196 * only if the current ep0 request tag is equal to the exception request
197 * tag. Thus only the most recently received ep0 request will get a
198 * status-stage response.
199 *
200 * Warning: This driver source file is too long. It ought to be split up
201 * into a header file plus about 3 separate .c files, to handle the details
202 * of the Gadget, USB Mass Storage, and SCSI protocols.
203 */
204
205
206#undef DEBUG
207#undef VERBOSE
208#undef DUMP_MSGS
209
210#include <linux/config.h>
211
212#include <asm/system.h>
213#include <asm/uaccess.h>
214
215#include <linux/bitops.h>
216#include <linux/blkdev.h>
217#include <linux/compiler.h>
218#include <linux/completion.h>
219#include <linux/dcache.h>
220#include <linux/delay.h>
221#include <linux/device.h>
222#include <linux/fcntl.h>
223#include <linux/file.h>
224#include <linux/fs.h>
225#include <linux/init.h>
226#include <linux/kernel.h>
227#include <linux/limits.h>
228#include <linux/list.h>
229#include <linux/module.h>
230#include <linux/moduleparam.h>
231#include <linux/pagemap.h>
232#include <linux/rwsem.h>
233#include <linux/sched.h>
234#include <linux/signal.h>
235#include <linux/slab.h>
236#include <linux/spinlock.h>
237#include <linux/string.h>
238#include <linux/suspend.h>
239#include <linux/utsname.h>
240#include <linux/wait.h>
241
242#include <linux/usb_ch9.h>
243#include <linux/usb_gadget.h>
244
245#include "gadget_chips.h"
246
247
248/*-------------------------------------------------------------------------*/
249
250#define DRIVER_DESC "File-backed Storage Gadget"
251#define DRIVER_NAME "g_file_storage"
252#define DRIVER_VERSION "20 October 2004"
253
254static const char longname[] = DRIVER_DESC;
255static const char shortname[] = DRIVER_NAME;
256
257MODULE_DESCRIPTION(DRIVER_DESC);
258MODULE_AUTHOR("Alan Stern");
259MODULE_LICENSE("Dual BSD/GPL");
260
261/* Thanks to NetChip Technologies for donating this product ID.
262 *
263 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
264 * Instead: allocate your own, using normal USB-IF procedures. */
265#define DRIVER_VENDOR_ID 0x0525 // NetChip
266#define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
267
268
269/*
270 * This driver assumes self-powered hardware and has no way for users to
271 * trigger remote wakeup. It uses autoconfiguration to select endpoints
272 * and endpoint addresses.
273 */
274
275
276/*-------------------------------------------------------------------------*/
277
278#define xprintk(f,level,fmt,args...) \
279 dev_printk(level , &(f)->gadget->dev , fmt , ## args)
280#define yprintk(l,level,fmt,args...) \
281 dev_printk(level , &(l)->dev , fmt , ## args)
282
283#ifdef DEBUG
284#define DBG(fsg,fmt,args...) \
285 xprintk(fsg , KERN_DEBUG , fmt , ## args)
286#define LDBG(lun,fmt,args...) \
287 yprintk(lun , KERN_DEBUG , fmt , ## args)
288#define MDBG(fmt,args...) \
289 printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
290#else
291#define DBG(fsg,fmt,args...) \
292 do { } while (0)
293#define LDBG(lun,fmt,args...) \
294 do { } while (0)
295#define MDBG(fmt,args...) \
296 do { } while (0)
297#undef VERBOSE
298#undef DUMP_MSGS
299#endif /* DEBUG */
300
301#ifdef VERBOSE
302#define VDBG DBG
303#define VLDBG LDBG
304#else
305#define VDBG(fsg,fmt,args...) \
306 do { } while (0)
307#define VLDBG(lun,fmt,args...) \
308 do { } while (0)
309#endif /* VERBOSE */
310
311#define ERROR(fsg,fmt,args...) \
312 xprintk(fsg , KERN_ERR , fmt , ## args)
313#define LERROR(lun,fmt,args...) \
314 yprintk(lun , KERN_ERR , fmt , ## args)
315
316#define WARN(fsg,fmt,args...) \
317 xprintk(fsg , KERN_WARNING , fmt , ## args)
318#define LWARN(lun,fmt,args...) \
319 yprintk(lun , KERN_WARNING , fmt , ## args)
320
321#define INFO(fsg,fmt,args...) \
322 xprintk(fsg , KERN_INFO , fmt , ## args)
323#define LINFO(lun,fmt,args...) \
324 yprintk(lun , KERN_INFO , fmt , ## args)
325
326#define MINFO(fmt,args...) \
327 printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
328
329
330/*-------------------------------------------------------------------------*/
331
332/* Encapsulate the module parameter settings */
333
334#define MAX_LUNS 8
335
336 /* Arggh! There should be a module_param_array_named macro! */
337static char *file[MAX_LUNS] = {NULL, };
338static int ro[MAX_LUNS] = {0, };
339
340static struct {
341 int num_filenames;
342 int num_ros;
343 unsigned int nluns;
344
345 char *transport_parm;
346 char *protocol_parm;
347 int removable;
348 unsigned short vendor;
349 unsigned short product;
350 unsigned short release;
351 unsigned int buflen;
352 int can_stall;
353
354 int transport_type;
355 char *transport_name;
356 int protocol_type;
357 char *protocol_name;
358
359} mod_data = { // Default values
360 .transport_parm = "BBB",
361 .protocol_parm = "SCSI",
362 .removable = 0,
363 .vendor = DRIVER_VENDOR_ID,
364 .product = DRIVER_PRODUCT_ID,
365 .release = 0xffff, // Use controller chip type
366 .buflen = 16384,
367 .can_stall = 1,
368 };
369
370
371module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
372MODULE_PARM_DESC(file, "names of backing files or devices");
373
374module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
375MODULE_PARM_DESC(ro, "true to force read-only");
376
377module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
378MODULE_PARM_DESC(luns, "number of LUNs");
379
380module_param_named(removable, mod_data.removable, bool, S_IRUGO);
381MODULE_PARM_DESC(removable, "true to simulate removable media");
382
383
384/* In the non-TEST version, only the module parameters listed above
385 * are available. */
386#ifdef CONFIG_USB_FILE_STORAGE_TEST
387
388module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
389MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
390
391module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
392MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
393 "8070, or SCSI)");
394
395module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
396MODULE_PARM_DESC(vendor, "USB Vendor ID");
397
398module_param_named(product, mod_data.product, ushort, S_IRUGO);
399MODULE_PARM_DESC(product, "USB Product ID");
400
401module_param_named(release, mod_data.release, ushort, S_IRUGO);
402MODULE_PARM_DESC(release, "USB release number");
403
404module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
405MODULE_PARM_DESC(buflen, "I/O buffer size");
406
407module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
408MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
409
410#endif /* CONFIG_USB_FILE_STORAGE_TEST */
411
412
413/*-------------------------------------------------------------------------*/
414
415/* USB protocol value = the transport method */
416#define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
417#define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
418#define USB_PR_BULK 0x50 // Bulk-only
419
420/* USB subclass value = the protocol encapsulation */
421#define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
422#define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
423#define USB_SC_QIC 0x03 // QIC-157 (tape)
424#define USB_SC_UFI 0x04 // UFI (floppy)
425#define USB_SC_8070 0x05 // SFF-8070i (removable)
426#define USB_SC_SCSI 0x06 // Transparent SCSI
427
428/* Bulk-only data structures */
429
430/* Command Block Wrapper */
431struct bulk_cb_wrap {
432 __le32 Signature; // Contains 'USBC'
433 u32 Tag; // Unique per command id
434 __le32 DataTransferLength; // Size of the data
435 u8 Flags; // Direction in bit 7
436 u8 Lun; // LUN (normally 0)
437 u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
438 u8 CDB[16]; // Command Data Block
439};
440
441#define USB_BULK_CB_WRAP_LEN 31
442#define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
443#define USB_BULK_IN_FLAG 0x80
444
445/* Command Status Wrapper */
446struct bulk_cs_wrap {
447 __le32 Signature; // Should = 'USBS'
448 u32 Tag; // Same as original command
449 __le32 Residue; // Amount not transferred
450 u8 Status; // See below
451};
452
453#define USB_BULK_CS_WRAP_LEN 13
454#define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
455#define USB_STATUS_PASS 0
456#define USB_STATUS_FAIL 1
457#define USB_STATUS_PHASE_ERROR 2
458
459/* Bulk-only class specific requests */
460#define USB_BULK_RESET_REQUEST 0xff
461#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
462
463
464/* CBI Interrupt data structure */
465struct interrupt_data {
466 u8 bType;
467 u8 bValue;
468};
469
470#define CBI_INTERRUPT_DATA_LEN 2
471
472/* CBI Accept Device-Specific Command request */
473#define USB_CBI_ADSC_REQUEST 0x00
474
475
476#define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
477
478/* SCSI commands that we recognize */
479#define SC_FORMAT_UNIT 0x04
480#define SC_INQUIRY 0x12
481#define SC_MODE_SELECT_6 0x15
482#define SC_MODE_SELECT_10 0x55
483#define SC_MODE_SENSE_6 0x1a
484#define SC_MODE_SENSE_10 0x5a
485#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
486#define SC_READ_6 0x08
487#define SC_READ_10 0x28
488#define SC_READ_12 0xa8
489#define SC_READ_CAPACITY 0x25
490#define SC_READ_FORMAT_CAPACITIES 0x23
491#define SC_RELEASE 0x17
492#define SC_REQUEST_SENSE 0x03
493#define SC_RESERVE 0x16
494#define SC_SEND_DIAGNOSTIC 0x1d
495#define SC_START_STOP_UNIT 0x1b
496#define SC_SYNCHRONIZE_CACHE 0x35
497#define SC_TEST_UNIT_READY 0x00
498#define SC_VERIFY 0x2f
499#define SC_WRITE_6 0x0a
500#define SC_WRITE_10 0x2a
501#define SC_WRITE_12 0xaa
502
503/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
504#define SS_NO_SENSE 0
505#define SS_COMMUNICATION_FAILURE 0x040800
506#define SS_INVALID_COMMAND 0x052000
507#define SS_INVALID_FIELD_IN_CDB 0x052400
508#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
509#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
510#define SS_MEDIUM_NOT_PRESENT 0x023a00
511#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
512#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
513#define SS_RESET_OCCURRED 0x062900
514#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
515#define SS_UNRECOVERED_READ_ERROR 0x031100
516#define SS_WRITE_ERROR 0x030c02
517#define SS_WRITE_PROTECTED 0x072700
518
519#define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
520#define ASC(x) ((u8) ((x) >> 8))
521#define ASCQ(x) ((u8) (x))
522
523
524/*-------------------------------------------------------------------------*/
525
526/*
527 * These definitions will permit the compiler to avoid generating code for
528 * parts of the driver that aren't used in the non-TEST version. Even gcc
529 * can recognize when a test of a constant expression yields a dead code
530 * path.
531 */
532
533#ifdef CONFIG_USB_FILE_STORAGE_TEST
534
535#define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
536#define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
537#define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
538
539#else
540
541#define transport_is_bbb() 1
542#define transport_is_cbi() 0
543#define protocol_is_scsi() 1
544
545#endif /* CONFIG_USB_FILE_STORAGE_TEST */
546
547
548struct lun {
549 struct file *filp;
550 loff_t file_length;
551 loff_t num_sectors;
552
553 unsigned int ro : 1;
554 unsigned int prevent_medium_removal : 1;
555 unsigned int registered : 1;
556
557 u32 sense_data;
558 u32 sense_data_info;
559 u32 unit_attention_data;
560
561 struct device dev;
562};
563
564#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
565
566static inline struct lun *dev_to_lun(struct device *dev)
567{
568 return container_of(dev, struct lun, dev);
569}
570
571
572/* Big enough to hold our biggest descriptor */
573#define EP0_BUFSIZE 256
574#define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
575
576/* Number of buffers we will use. 2 is enough for double-buffering */
577#define NUM_BUFFERS 2
578
579enum fsg_buffer_state {
580 BUF_STATE_EMPTY = 0,
581 BUF_STATE_FULL,
582 BUF_STATE_BUSY
583};
584
585struct fsg_buffhd {
586 void *buf;
587 dma_addr_t dma;
588 volatile enum fsg_buffer_state state;
589 struct fsg_buffhd *next;
590
591 /* The NetChip 2280 is faster, and handles some protocol faults
592 * better, if we don't submit any short bulk-out read requests.
593 * So we will record the intended request length here. */
594 unsigned int bulk_out_intended_length;
595
596 struct usb_request *inreq;
597 volatile int inreq_busy;
598 struct usb_request *outreq;
599 volatile int outreq_busy;
600};
601
602enum fsg_state {
603 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
604 FSG_STATE_DATA_PHASE,
605 FSG_STATE_STATUS_PHASE,
606
607 FSG_STATE_IDLE = 0,
608 FSG_STATE_ABORT_BULK_OUT,
609 FSG_STATE_RESET,
610 FSG_STATE_INTERFACE_CHANGE,
611 FSG_STATE_CONFIG_CHANGE,
612 FSG_STATE_DISCONNECT,
613 FSG_STATE_EXIT,
614 FSG_STATE_TERMINATED
615};
616
617enum data_direction {
618 DATA_DIR_UNKNOWN = 0,
619 DATA_DIR_FROM_HOST,
620 DATA_DIR_TO_HOST,
621 DATA_DIR_NONE
622};
623
624struct fsg_dev {
625 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
626 spinlock_t lock;
627 struct usb_gadget *gadget;
628
629 /* filesem protects: backing files in use */
630 struct rw_semaphore filesem;
631
632 struct usb_ep *ep0; // Handy copy of gadget->ep0
633 struct usb_request *ep0req; // For control responses
634 volatile unsigned int ep0_req_tag;
635 const char *ep0req_name;
636
637 struct usb_request *intreq; // For interrupt responses
638 volatile int intreq_busy;
639 struct fsg_buffhd *intr_buffhd;
640
641 unsigned int bulk_out_maxpacket;
642 enum fsg_state state; // For exception handling
643 unsigned int exception_req_tag;
644
645 u8 config, new_config;
646
647 unsigned int running : 1;
648 unsigned int bulk_in_enabled : 1;
649 unsigned int bulk_out_enabled : 1;
650 unsigned int intr_in_enabled : 1;
651 unsigned int phase_error : 1;
652 unsigned int short_packet_received : 1;
653 unsigned int bad_lun_okay : 1;
654
655 unsigned long atomic_bitflags;
656#define REGISTERED 0
657#define CLEAR_BULK_HALTS 1
658#define SUSPENDED 2
659
660 struct usb_ep *bulk_in;
661 struct usb_ep *bulk_out;
662 struct usb_ep *intr_in;
663
664 struct fsg_buffhd *next_buffhd_to_fill;
665 struct fsg_buffhd *next_buffhd_to_drain;
666 struct fsg_buffhd buffhds[NUM_BUFFERS];
667
668 wait_queue_head_t thread_wqh;
669 int thread_wakeup_needed;
670 struct completion thread_notifier;
671 int thread_pid;
672 struct task_struct *thread_task;
673 sigset_t thread_signal_mask;
674
675 int cmnd_size;
676 u8 cmnd[MAX_COMMAND_SIZE];
677 enum data_direction data_dir;
678 u32 data_size;
679 u32 data_size_from_cmnd;
680 u32 tag;
681 unsigned int lun;
682 u32 residue;
683 u32 usb_amount_left;
684
685 /* The CB protocol offers no way for a host to know when a command
686 * has completed. As a result the next command may arrive early,
687 * and we will still have to handle it. For that reason we need
688 * a buffer to store new commands when using CB (or CBI, which
689 * does not oblige a host to wait for command completion either). */
690 int cbbuf_cmnd_size;
691 u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
692
693 unsigned int nluns;
694 struct lun *luns;
695 struct lun *curlun;
696 struct completion lun_released;
697};
698
699typedef void (*fsg_routine_t)(struct fsg_dev *);
700
701static int inline exception_in_progress(struct fsg_dev *fsg)
702{
703 return (fsg->state > FSG_STATE_IDLE);
704}
705
706/* Make bulk-out requests be divisible by the maxpacket size */
707static void inline set_bulk_out_req_length(struct fsg_dev *fsg,
708 struct fsg_buffhd *bh, unsigned int length)
709{
710 unsigned int rem;
711
712 bh->bulk_out_intended_length = length;
713 rem = length % fsg->bulk_out_maxpacket;
714 if (rem > 0)
715 length += fsg->bulk_out_maxpacket - rem;
716 bh->outreq->length = length;
717}
718
719static struct fsg_dev *the_fsg;
720static struct usb_gadget_driver fsg_driver;
721
722static void close_backing_file(struct lun *curlun);
723static void close_all_backing_files(struct fsg_dev *fsg);
724
725
726/*-------------------------------------------------------------------------*/
727
728#ifdef DUMP_MSGS
729
730static void dump_msg(struct fsg_dev *fsg, const char *label,
731 const u8 *buf, unsigned int length)
732{
733 unsigned int start, num, i;
734 char line[52], *p;
735
736 if (length >= 512)
737 return;
738 DBG(fsg, "%s, length %u:\n", label, length);
739
740 start = 0;
741 while (length > 0) {
742 num = min(length, 16u);
743 p = line;
744 for (i = 0; i < num; ++i) {
745 if (i == 8)
746 *p++ = ' ';
747 sprintf(p, " %02x", buf[i]);
748 p += 3;
749 }
750 *p = 0;
751 printk(KERN_DEBUG "%6x: %s\n", start, line);
752 buf += num;
753 start += num;
754 length -= num;
755 }
756}
757
758static void inline dump_cdb(struct fsg_dev *fsg)
759{}
760
761#else
762
763static void inline dump_msg(struct fsg_dev *fsg, const char *label,
764 const u8 *buf, unsigned int length)
765{}
766
767static void inline dump_cdb(struct fsg_dev *fsg)
768{
769 int i;
770 char cmdbuf[3*MAX_COMMAND_SIZE + 1];
771
772 for (i = 0; i < fsg->cmnd_size; ++i)
773 sprintf(cmdbuf + i*3, " %02x", fsg->cmnd[i]);
774 VDBG(fsg, "SCSI CDB: %s\n", cmdbuf);
775}
776
777#endif /* DUMP_MSGS */
778
779
780static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
781{
782 const char *name;
783
784 if (ep == fsg->bulk_in)
785 name = "bulk-in";
786 else if (ep == fsg->bulk_out)
787 name = "bulk-out";
788 else
789 name = ep->name;
790 DBG(fsg, "%s set halt\n", name);
791 return usb_ep_set_halt(ep);
792}
793
794
795/*-------------------------------------------------------------------------*/
796
797/* Routines for unaligned data access */
798
799static u16 inline get_be16(u8 *buf)
800{
801 return ((u16) buf[0] << 8) | ((u16) buf[1]);
802}
803
804static u32 inline get_be32(u8 *buf)
805{
806 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
807 ((u32) buf[2] << 8) | ((u32) buf[3]);
808}
809
810static void inline put_be16(u8 *buf, u16 val)
811{
812 buf[0] = val >> 8;
813 buf[1] = val;
814}
815
816static void inline put_be32(u8 *buf, u32 val)
817{
818 buf[0] = val >> 24;
819 buf[1] = val >> 16;
820 buf[2] = val >> 8;
821 buf[3] = val;
822}
823
824
825/*-------------------------------------------------------------------------*/
826
827/*
828 * DESCRIPTORS ... most are static, but strings and (full) configuration
829 * descriptors are built on demand. Also the (static) config and interface
830 * descriptors are adjusted during fsg_bind().
831 */
832#define STRING_MANUFACTURER 1
833#define STRING_PRODUCT 2
834#define STRING_SERIAL 3
835#define STRING_CONFIG 4
836#define STRING_INTERFACE 5
837
838/* There is only one configuration. */
839#define CONFIG_VALUE 1
840
841static struct usb_device_descriptor
842device_desc = {
843 .bLength = sizeof device_desc,
844 .bDescriptorType = USB_DT_DEVICE,
845
846 .bcdUSB = __constant_cpu_to_le16(0x0200),
847 .bDeviceClass = USB_CLASS_PER_INTERFACE,
848
849 /* The next three values can be overridden by module parameters */
850 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
851 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
852 .bcdDevice = __constant_cpu_to_le16(0xffff),
853
854 .iManufacturer = STRING_MANUFACTURER,
855 .iProduct = STRING_PRODUCT,
856 .iSerialNumber = STRING_SERIAL,
857 .bNumConfigurations = 1,
858};
859
860static struct usb_config_descriptor
861config_desc = {
862 .bLength = sizeof config_desc,
863 .bDescriptorType = USB_DT_CONFIG,
864
865 /* wTotalLength computed by usb_gadget_config_buf() */
866 .bNumInterfaces = 1,
867 .bConfigurationValue = CONFIG_VALUE,
868 .iConfiguration = STRING_CONFIG,
869 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
870 .bMaxPower = 1, // self-powered
871};
872
873static struct usb_otg_descriptor
874otg_desc = {
875 .bLength = sizeof(otg_desc),
876 .bDescriptorType = USB_DT_OTG,
877
878 .bmAttributes = USB_OTG_SRP,
879};
880
881/* There is only one interface. */
882
883static struct usb_interface_descriptor
884intf_desc = {
885 .bLength = sizeof intf_desc,
886 .bDescriptorType = USB_DT_INTERFACE,
887
888 .bNumEndpoints = 2, // Adjusted during fsg_bind()
889 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
890 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
891 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
892 .iInterface = STRING_INTERFACE,
893};
894
895/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
896 * and interrupt-in. */
897
898static struct usb_endpoint_descriptor
899fs_bulk_in_desc = {
900 .bLength = USB_DT_ENDPOINT_SIZE,
901 .bDescriptorType = USB_DT_ENDPOINT,
902
903 .bEndpointAddress = USB_DIR_IN,
904 .bmAttributes = USB_ENDPOINT_XFER_BULK,
905 /* wMaxPacketSize set by autoconfiguration */
906};
907
908static struct usb_endpoint_descriptor
909fs_bulk_out_desc = {
910 .bLength = USB_DT_ENDPOINT_SIZE,
911 .bDescriptorType = USB_DT_ENDPOINT,
912
913 .bEndpointAddress = USB_DIR_OUT,
914 .bmAttributes = USB_ENDPOINT_XFER_BULK,
915 /* wMaxPacketSize set by autoconfiguration */
916};
917
918static struct usb_endpoint_descriptor
919fs_intr_in_desc = {
920 .bLength = USB_DT_ENDPOINT_SIZE,
921 .bDescriptorType = USB_DT_ENDPOINT,
922
923 .bEndpointAddress = USB_DIR_IN,
924 .bmAttributes = USB_ENDPOINT_XFER_INT,
925 .wMaxPacketSize = __constant_cpu_to_le16(2),
926 .bInterval = 32, // frames -> 32 ms
927};
928
929static const struct usb_descriptor_header *fs_function[] = {
930 (struct usb_descriptor_header *) &otg_desc,
931 (struct usb_descriptor_header *) &intf_desc,
932 (struct usb_descriptor_header *) &fs_bulk_in_desc,
933 (struct usb_descriptor_header *) &fs_bulk_out_desc,
934 (struct usb_descriptor_header *) &fs_intr_in_desc,
935 NULL,
936};
937#define FS_FUNCTION_PRE_EP_ENTRIES 2
938
939
940#ifdef CONFIG_USB_GADGET_DUALSPEED
941
942/*
943 * USB 2.0 devices need to expose both high speed and full speed
944 * descriptors, unless they only run at full speed.
945 *
946 * That means alternate endpoint descriptors (bigger packets)
947 * and a "device qualifier" ... plus more construction options
948 * for the config descriptor.
949 */
950static struct usb_qualifier_descriptor
951dev_qualifier = {
952 .bLength = sizeof dev_qualifier,
953 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
954
955 .bcdUSB = __constant_cpu_to_le16(0x0200),
956 .bDeviceClass = USB_CLASS_PER_INTERFACE,
957
958 .bNumConfigurations = 1,
959};
960
961static struct usb_endpoint_descriptor
962hs_bulk_in_desc = {
963 .bLength = USB_DT_ENDPOINT_SIZE,
964 .bDescriptorType = USB_DT_ENDPOINT,
965
966 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
967 .bmAttributes = USB_ENDPOINT_XFER_BULK,
968 .wMaxPacketSize = __constant_cpu_to_le16(512),
969};
970
971static struct usb_endpoint_descriptor
972hs_bulk_out_desc = {
973 .bLength = USB_DT_ENDPOINT_SIZE,
974 .bDescriptorType = USB_DT_ENDPOINT,
975
976 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
977 .bmAttributes = USB_ENDPOINT_XFER_BULK,
978 .wMaxPacketSize = __constant_cpu_to_le16(512),
979 .bInterval = 1, // NAK every 1 uframe
980};
981
982static struct usb_endpoint_descriptor
983hs_intr_in_desc = {
984 .bLength = USB_DT_ENDPOINT_SIZE,
985 .bDescriptorType = USB_DT_ENDPOINT,
986
987 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
988 .bmAttributes = USB_ENDPOINT_XFER_INT,
989 .wMaxPacketSize = __constant_cpu_to_le16(2),
990 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
991};
992
993static const struct usb_descriptor_header *hs_function[] = {
994 (struct usb_descriptor_header *) &otg_desc,
995 (struct usb_descriptor_header *) &intf_desc,
996 (struct usb_descriptor_header *) &hs_bulk_in_desc,
997 (struct usb_descriptor_header *) &hs_bulk_out_desc,
998 (struct usb_descriptor_header *) &hs_intr_in_desc,
999 NULL,
1000};
1001#define HS_FUNCTION_PRE_EP_ENTRIES 2
1002
1003/* Maxpacket and other transfer characteristics vary by speed. */
1004#define ep_desc(g,fs,hs) (((g)->speed==USB_SPEED_HIGH) ? (hs) : (fs))
1005
1006#else
1007
1008/* If there's no high speed support, always use the full-speed descriptor. */
1009#define ep_desc(g,fs,hs) fs
1010
1011#endif /* !CONFIG_USB_GADGET_DUALSPEED */
1012
1013
1014/* The CBI specification limits the serial string to 12 uppercase hexadecimal
1015 * characters. */
1016static char manufacturer[64];
1017static char serial[13];
1018
1019/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1020static struct usb_string strings[] = {
1021 {STRING_MANUFACTURER, manufacturer},
1022 {STRING_PRODUCT, longname},
1023 {STRING_SERIAL, serial},
1024 {STRING_CONFIG, "Self-powered"},
1025 {STRING_INTERFACE, "Mass Storage"},
1026 {}
1027};
1028
1029static struct usb_gadget_strings stringtab = {
1030 .language = 0x0409, // en-us
1031 .strings = strings,
1032};
1033
1034
1035/*
1036 * Config descriptors must agree with the code that sets configurations
1037 * and with code managing interfaces and their altsettings. They must
1038 * also handle different speeds and other-speed requests.
1039 */
1040static int populate_config_buf(struct usb_gadget *gadget,
1041 u8 *buf, u8 type, unsigned index)
1042{
1043#ifdef CONFIG_USB_GADGET_DUALSPEED
1044 enum usb_device_speed speed = gadget->speed;
1045#endif
1046 int len;
1047 const struct usb_descriptor_header **function;
1048
1049 if (index > 0)
1050 return -EINVAL;
1051
1052#ifdef CONFIG_USB_GADGET_DUALSPEED
1053 if (type == USB_DT_OTHER_SPEED_CONFIG)
1054 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1055 if (speed == USB_SPEED_HIGH)
1056 function = hs_function;
1057 else
1058#endif
1059 function = fs_function;
1060
1061 /* for now, don't advertise srp-only devices */
1062 if (!gadget->is_otg)
1063 function++;
1064
1065 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1066 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1067 return len;
1068}
1069
1070
1071/*-------------------------------------------------------------------------*/
1072
1073/* These routines may be called in process context or in_irq */
1074
1075static void wakeup_thread(struct fsg_dev *fsg)
1076{
1077 /* Tell the main thread that something has happened */
1078 fsg->thread_wakeup_needed = 1;
1079 wake_up_all(&fsg->thread_wqh);
1080}
1081
1082
1083static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1084{
1085 unsigned long flags;
1086 struct task_struct *thread_task;
1087
1088 /* Do nothing if a higher-priority exception is already in progress.
1089 * If a lower-or-equal priority exception is in progress, preempt it
1090 * and notify the main thread by sending it a signal. */
1091 spin_lock_irqsave(&fsg->lock, flags);
1092 if (fsg->state <= new_state) {
1093 fsg->exception_req_tag = fsg->ep0_req_tag;
1094 fsg->state = new_state;
1095 thread_task = fsg->thread_task;
1096 if (thread_task)
1097 send_sig_info(SIGUSR1, SEND_SIG_FORCED, thread_task);
1098 }
1099 spin_unlock_irqrestore(&fsg->lock, flags);
1100}
1101
1102
1103/*-------------------------------------------------------------------------*/
1104
1105/* The disconnect callback and ep0 routines. These always run in_irq,
1106 * except that ep0_queue() is called in the main thread to acknowledge
1107 * completion of various requests: set config, set interface, and
1108 * Bulk-only device reset. */
1109
1110static void fsg_disconnect(struct usb_gadget *gadget)
1111{
1112 struct fsg_dev *fsg = get_gadget_data(gadget);
1113
1114 DBG(fsg, "disconnect or port reset\n");
1115 raise_exception(fsg, FSG_STATE_DISCONNECT);
1116}
1117
1118
1119static int ep0_queue(struct fsg_dev *fsg)
1120{
1121 int rc;
1122
1123 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1124 if (rc != 0 && rc != -ESHUTDOWN) {
1125
1126 /* We can't do much more than wait for a reset */
1127 WARN(fsg, "error in submission: %s --> %d\n",
1128 fsg->ep0->name, rc);
1129 }
1130 return rc;
1131}
1132
1133static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1134{
1135 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1136
1137 if (req->actual > 0)
1138 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1139 if (req->status || req->actual != req->length)
1140 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1141 req->status, req->actual, req->length);
1142 if (req->status == -ECONNRESET) // Request was cancelled
1143 usb_ep_fifo_flush(ep);
1144
1145 if (req->status == 0 && req->context)
1146 ((fsg_routine_t) (req->context))(fsg);
1147}
1148
1149
1150/*-------------------------------------------------------------------------*/
1151
1152/* Bulk and interrupt endpoint completion handlers.
1153 * These always run in_irq. */
1154
1155static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1156{
1157 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1158 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1159
1160 if (req->status || req->actual != req->length)
1161 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1162 req->status, req->actual, req->length);
1163 if (req->status == -ECONNRESET) // Request was cancelled
1164 usb_ep_fifo_flush(ep);
1165
1166 /* Hold the lock while we update the request and buffer states */
1167 spin_lock(&fsg->lock);
1168 bh->inreq_busy = 0;
1169 bh->state = BUF_STATE_EMPTY;
1170 spin_unlock(&fsg->lock);
1171 wakeup_thread(fsg);
1172}
1173
1174static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1175{
1176 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1177 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1178
1179 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1180 if (req->status || req->actual != bh->bulk_out_intended_length)
1181 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1182 req->status, req->actual,
1183 bh->bulk_out_intended_length);
1184 if (req->status == -ECONNRESET) // Request was cancelled
1185 usb_ep_fifo_flush(ep);
1186
1187 /* Hold the lock while we update the request and buffer states */
1188 spin_lock(&fsg->lock);
1189 bh->outreq_busy = 0;
1190 bh->state = BUF_STATE_FULL;
1191 spin_unlock(&fsg->lock);
1192 wakeup_thread(fsg);
1193}
1194
1195
1196#ifdef CONFIG_USB_FILE_STORAGE_TEST
1197static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1198{
1199 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1200 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1201
1202 if (req->status || req->actual != req->length)
1203 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1204 req->status, req->actual, req->length);
1205 if (req->status == -ECONNRESET) // Request was cancelled
1206 usb_ep_fifo_flush(ep);
1207
1208 /* Hold the lock while we update the request and buffer states */
1209 spin_lock(&fsg->lock);
1210 fsg->intreq_busy = 0;
1211 bh->state = BUF_STATE_EMPTY;
1212 spin_unlock(&fsg->lock);
1213 wakeup_thread(fsg);
1214}
1215
1216#else
1217static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1218{}
1219#endif /* CONFIG_USB_FILE_STORAGE_TEST */
1220
1221
1222/*-------------------------------------------------------------------------*/
1223
1224/* Ep0 class-specific handlers. These always run in_irq. */
1225
1226#ifdef CONFIG_USB_FILE_STORAGE_TEST
1227static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1228{
1229 struct usb_request *req = fsg->ep0req;
1230 static u8 cbi_reset_cmnd[6] = {
1231 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1232
1233 /* Error in command transfer? */
1234 if (req->status || req->length != req->actual ||
1235 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1236
1237 /* Not all controllers allow a protocol stall after
1238 * receiving control-out data, but we'll try anyway. */
1239 fsg_set_halt(fsg, fsg->ep0);
1240 return; // Wait for reset
1241 }
1242
1243 /* Is it the special reset command? */
1244 if (req->actual >= sizeof cbi_reset_cmnd &&
1245 memcmp(req->buf, cbi_reset_cmnd,
1246 sizeof cbi_reset_cmnd) == 0) {
1247
1248 /* Raise an exception to stop the current operation
1249 * and reinitialize our state. */
1250 DBG(fsg, "cbi reset request\n");
1251 raise_exception(fsg, FSG_STATE_RESET);
1252 return;
1253 }
1254
1255 VDBG(fsg, "CB[I] accept device-specific command\n");
1256 spin_lock(&fsg->lock);
1257
1258 /* Save the command for later */
1259 if (fsg->cbbuf_cmnd_size)
1260 WARN(fsg, "CB[I] overwriting previous command\n");
1261 fsg->cbbuf_cmnd_size = req->actual;
1262 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1263
1264 spin_unlock(&fsg->lock);
1265 wakeup_thread(fsg);
1266}
1267
1268#else
1269static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1270{}
1271#endif /* CONFIG_USB_FILE_STORAGE_TEST */
1272
1273
1274static int class_setup_req(struct fsg_dev *fsg,
1275 const struct usb_ctrlrequest *ctrl)
1276{
1277 struct usb_request *req = fsg->ep0req;
1278 int value = -EOPNOTSUPP;
1279 u16 w_index = ctrl->wIndex;
1280 u16 w_length = ctrl->wLength;
1281
1282 if (!fsg->config)
1283 return value;
1284
1285 /* Handle Bulk-only class-specific requests */
1286 if (transport_is_bbb()) {
1287 switch (ctrl->bRequest) {
1288
1289 case USB_BULK_RESET_REQUEST:
1290 if (ctrl->bRequestType != (USB_DIR_OUT |
1291 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1292 break;
1293 if (w_index != 0) {
1294 value = -EDOM;
1295 break;
1296 }
1297
1298 /* Raise an exception to stop the current operation
1299 * and reinitialize our state. */
1300 DBG(fsg, "bulk reset request\n");
1301 raise_exception(fsg, FSG_STATE_RESET);
1302 value = DELAYED_STATUS;
1303 break;
1304
1305 case USB_BULK_GET_MAX_LUN_REQUEST:
1306 if (ctrl->bRequestType != (USB_DIR_IN |
1307 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1308 break;
1309 if (w_index != 0) {
1310 value = -EDOM;
1311 break;
1312 }
1313 VDBG(fsg, "get max LUN\n");
1314 *(u8 *) req->buf = fsg->nluns - 1;
1315 value = min(w_length, (u16) 1);
1316 break;
1317 }
1318 }
1319
1320 /* Handle CBI class-specific requests */
1321 else {
1322 switch (ctrl->bRequest) {
1323
1324 case USB_CBI_ADSC_REQUEST:
1325 if (ctrl->bRequestType != (USB_DIR_OUT |
1326 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1327 break;
1328 if (w_index != 0) {
1329 value = -EDOM;
1330 break;
1331 }
1332 if (w_length > MAX_COMMAND_SIZE) {
1333 value = -EOVERFLOW;
1334 break;
1335 }
1336 value = w_length;
1337 fsg->ep0req->context = received_cbi_adsc;
1338 break;
1339 }
1340 }
1341
1342 if (value == -EOPNOTSUPP)
1343 VDBG(fsg,
1344 "unknown class-specific control req "
1345 "%02x.%02x v%04x i%04x l%u\n",
1346 ctrl->bRequestType, ctrl->bRequest,
1347 ctrl->wValue, w_index, w_length);
1348 return value;
1349}
1350
1351
1352/*-------------------------------------------------------------------------*/
1353
1354/* Ep0 standard request handlers. These always run in_irq. */
1355
1356static int standard_setup_req(struct fsg_dev *fsg,
1357 const struct usb_ctrlrequest *ctrl)
1358{
1359 struct usb_request *req = fsg->ep0req;
1360 int value = -EOPNOTSUPP;
1361 u16 w_index = ctrl->wIndex;
1362 u16 w_value = ctrl->wValue;
1363 u16 w_length = ctrl->wLength;
1364
1365 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1366 * but config change events will also reconfigure hardware. */
1367 switch (ctrl->bRequest) {
1368
1369 case USB_REQ_GET_DESCRIPTOR:
1370 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1371 USB_RECIP_DEVICE))
1372 break;
1373 switch (w_value >> 8) {
1374
1375 case USB_DT_DEVICE:
1376 VDBG(fsg, "get device descriptor\n");
1377 value = min(w_length, (u16) sizeof device_desc);
1378 memcpy(req->buf, &device_desc, value);
1379 break;
1380#ifdef CONFIG_USB_GADGET_DUALSPEED
1381 case USB_DT_DEVICE_QUALIFIER:
1382 VDBG(fsg, "get device qualifier\n");
1383 if (!fsg->gadget->is_dualspeed)
1384 break;
1385 value = min(w_length, (u16) sizeof dev_qualifier);
1386 memcpy(req->buf, &dev_qualifier, value);
1387 break;
1388
1389 case USB_DT_OTHER_SPEED_CONFIG:
1390 VDBG(fsg, "get other-speed config descriptor\n");
1391 if (!fsg->gadget->is_dualspeed)
1392 break;
1393 goto get_config;
1394#endif
1395 case USB_DT_CONFIG:
1396 VDBG(fsg, "get configuration descriptor\n");
1397#ifdef CONFIG_USB_GADGET_DUALSPEED
1398 get_config:
1399#endif
1400 value = populate_config_buf(fsg->gadget,
1401 req->buf,
1402 w_value >> 8,
1403 w_value & 0xff);
1404 if (value >= 0)
1405 value = min(w_length, (u16) value);
1406 break;
1407
1408 case USB_DT_STRING:
1409 VDBG(fsg, "get string descriptor\n");
1410
1411 /* wIndex == language code */
1412 value = usb_gadget_get_string(&stringtab,
1413 w_value & 0xff, req->buf);
1414 if (value >= 0)
1415 value = min(w_length, (u16) value);
1416 break;
1417 }
1418 break;
1419
1420 /* One config, two speeds */
1421 case USB_REQ_SET_CONFIGURATION:
1422 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1423 USB_RECIP_DEVICE))
1424 break;
1425 VDBG(fsg, "set configuration\n");
1426 if (w_value == CONFIG_VALUE || w_value == 0) {
1427 fsg->new_config = w_value;
1428
1429 /* Raise an exception to wipe out previous transaction
1430 * state (queued bufs, etc) and set the new config. */
1431 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1432 value = DELAYED_STATUS;
1433 }
1434 break;
1435 case USB_REQ_GET_CONFIGURATION:
1436 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1437 USB_RECIP_DEVICE))
1438 break;
1439 VDBG(fsg, "get configuration\n");
1440 *(u8 *) req->buf = fsg->config;
1441 value = min(w_length, (u16) 1);
1442 break;
1443
1444 case USB_REQ_SET_INTERFACE:
1445 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1446 USB_RECIP_INTERFACE))
1447 break;
1448 if (fsg->config && w_index == 0) {
1449
1450 /* Raise an exception to wipe out previous transaction
1451 * state (queued bufs, etc) and install the new
1452 * interface altsetting. */
1453 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1454 value = DELAYED_STATUS;
1455 }
1456 break;
1457 case USB_REQ_GET_INTERFACE:
1458 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1459 USB_RECIP_INTERFACE))
1460 break;
1461 if (!fsg->config)
1462 break;
1463 if (w_index != 0) {
1464 value = -EDOM;
1465 break;
1466 }
1467 VDBG(fsg, "get interface\n");
1468 *(u8 *) req->buf = 0;
1469 value = min(w_length, (u16) 1);
1470 break;
1471
1472 default:
1473 VDBG(fsg,
1474 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1475 ctrl->bRequestType, ctrl->bRequest,
1476 w_value, w_index, w_length);
1477 }
1478
1479 return value;
1480}
1481
1482
1483static int fsg_setup(struct usb_gadget *gadget,
1484 const struct usb_ctrlrequest *ctrl)
1485{
1486 struct fsg_dev *fsg = get_gadget_data(gadget);
1487 int rc;
1488
1489 ++fsg->ep0_req_tag; // Record arrival of a new request
1490 fsg->ep0req->context = NULL;
1491 fsg->ep0req->length = 0;
1492 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1493
1494 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1495 rc = class_setup_req(fsg, ctrl);
1496 else
1497 rc = standard_setup_req(fsg, ctrl);
1498
1499 /* Respond with data/status or defer until later? */
1500 if (rc >= 0 && rc != DELAYED_STATUS) {
1501 fsg->ep0req->length = rc;
1502 fsg->ep0req->zero = (rc < ctrl->wLength &&
1503 (rc % gadget->ep0->maxpacket) == 0);
1504 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1505 "ep0-in" : "ep0-out");
1506 rc = ep0_queue(fsg);
1507 }
1508
1509 /* Device either stalls (rc < 0) or reports success */
1510 return rc;
1511}
1512
1513
1514/*-------------------------------------------------------------------------*/
1515
1516/* All the following routines run in process context */
1517
1518
1519/* Use this for bulk or interrupt transfers, not ep0 */
1520static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1521 struct usb_request *req, volatile int *pbusy,
1522 volatile enum fsg_buffer_state *state)
1523{
1524 int rc;
1525
1526 if (ep == fsg->bulk_in)
1527 dump_msg(fsg, "bulk-in", req->buf, req->length);
1528 else if (ep == fsg->intr_in)
1529 dump_msg(fsg, "intr-in", req->buf, req->length);
1530 *pbusy = 1;
1531 *state = BUF_STATE_BUSY;
1532 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1533 if (rc != 0) {
1534 *pbusy = 0;
1535 *state = BUF_STATE_EMPTY;
1536
1537 /* We can't do much more than wait for a reset */
1538
1539 /* Note: currently the net2280 driver fails zero-length
1540 * submissions if DMA is enabled. */
1541 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1542 req->length == 0))
1543 WARN(fsg, "error in submission: %s --> %d\n",
1544 ep->name, rc);
1545 }
1546}
1547
1548
1549static int sleep_thread(struct fsg_dev *fsg)
1550{
1551 int rc;
1552
1553 /* Wait until a signal arrives or we are woken up */
1554 rc = wait_event_interruptible(fsg->thread_wqh,
1555 fsg->thread_wakeup_needed);
1556 fsg->thread_wakeup_needed = 0;
1557 if (current->flags & PF_FREEZE)
1558 refrigerator(PF_FREEZE);
1559 return (rc ? -EINTR : 0);
1560}
1561
1562
1563/*-------------------------------------------------------------------------*/
1564
1565static int do_read(struct fsg_dev *fsg)
1566{
1567 struct lun *curlun = fsg->curlun;
1568 u32 lba;
1569 struct fsg_buffhd *bh;
1570 int rc;
1571 u32 amount_left;
1572 loff_t file_offset, file_offset_tmp;
1573 unsigned int amount;
1574 unsigned int partial_page;
1575 ssize_t nread;
1576
1577 /* Get the starting Logical Block Address and check that it's
1578 * not too big */
1579 if (fsg->cmnd[0] == SC_READ_6)
1580 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1581 else {
1582 lba = get_be32(&fsg->cmnd[2]);
1583
1584 /* We allow DPO (Disable Page Out = don't save data in the
1585 * cache) and FUA (Force Unit Access = don't read from the
1586 * cache), but we don't implement them. */
1587 if ((fsg->cmnd[1] & ~0x18) != 0) {
1588 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1589 return -EINVAL;
1590 }
1591 }
1592 if (lba >= curlun->num_sectors) {
1593 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1594 return -EINVAL;
1595 }
1596 file_offset = ((loff_t) lba) << 9;
1597
1598 /* Carry out the file reads */
1599 amount_left = fsg->data_size_from_cmnd;
1600 if (unlikely(amount_left == 0))
1601 return -EIO; // No default reply
1602
1603 for (;;) {
1604
1605 /* Figure out how much we need to read:
1606 * Try to read the remaining amount.
1607 * But don't read more than the buffer size.
1608 * And don't try to read past the end of the file.
1609 * Finally, if we're not at a page boundary, don't read past
1610 * the next page.
1611 * If this means reading 0 then we were asked to read past
1612 * the end of file. */
1613 amount = min((unsigned int) amount_left, mod_data.buflen);
1614 amount = min((loff_t) amount,
1615 curlun->file_length - file_offset);
1616 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1617 if (partial_page > 0)
1618 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1619 partial_page);
1620
1621 /* Wait for the next buffer to become available */
1622 bh = fsg->next_buffhd_to_fill;
1623 while (bh->state != BUF_STATE_EMPTY) {
1624 if ((rc = sleep_thread(fsg)) != 0)
1625 return rc;
1626 }
1627
1628 /* If we were asked to read past the end of file,
1629 * end with an empty buffer. */
1630 if (amount == 0) {
1631 curlun->sense_data =
1632 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1633 curlun->sense_data_info = file_offset >> 9;
1634 bh->inreq->length = 0;
1635 bh->state = BUF_STATE_FULL;
1636 break;
1637 }
1638
1639 /* Perform the read */
1640 file_offset_tmp = file_offset;
1641 nread = vfs_read(curlun->filp,
1642 (char __user *) bh->buf,
1643 amount, &file_offset_tmp);
1644 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1645 (unsigned long long) file_offset,
1646 (int) nread);
1647 if (signal_pending(current))
1648 return -EINTR;
1649
1650 if (nread < 0) {
1651 LDBG(curlun, "error in file read: %d\n",
1652 (int) nread);
1653 nread = 0;
1654 } else if (nread < amount) {
1655 LDBG(curlun, "partial file read: %d/%u\n",
1656 (int) nread, amount);
1657 nread -= (nread & 511); // Round down to a block
1658 }
1659 file_offset += nread;
1660 amount_left -= nread;
1661 fsg->residue -= nread;
1662 bh->inreq->length = nread;
1663 bh->state = BUF_STATE_FULL;
1664
1665 /* If an error occurred, report it and its position */
1666 if (nread < amount) {
1667 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1668 curlun->sense_data_info = file_offset >> 9;
1669 break;
1670 }
1671
1672 if (amount_left == 0)
1673 break; // No more left to read
1674
1675 /* Send this buffer and go read some more */
1676 bh->inreq->zero = 0;
1677 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1678 &bh->inreq_busy, &bh->state);
1679 fsg->next_buffhd_to_fill = bh->next;
1680 }
1681
1682 return -EIO; // No default reply
1683}
1684
1685
1686/*-------------------------------------------------------------------------*/
1687
1688static int do_write(struct fsg_dev *fsg)
1689{
1690 struct lun *curlun = fsg->curlun;
1691 u32 lba;
1692 struct fsg_buffhd *bh;
1693 int get_some_more;
1694 u32 amount_left_to_req, amount_left_to_write;
1695 loff_t usb_offset, file_offset, file_offset_tmp;
1696 unsigned int amount;
1697 unsigned int partial_page;
1698 ssize_t nwritten;
1699 int rc;
1700
1701 if (curlun->ro) {
1702 curlun->sense_data = SS_WRITE_PROTECTED;
1703 return -EINVAL;
1704 }
1705 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1706
1707 /* Get the starting Logical Block Address and check that it's
1708 * not too big */
1709 if (fsg->cmnd[0] == SC_WRITE_6)
1710 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1711 else {
1712 lba = get_be32(&fsg->cmnd[2]);
1713
1714 /* We allow DPO (Disable Page Out = don't save data in the
1715 * cache) and FUA (Force Unit Access = write directly to the
1716 * medium). We don't implement DPO; we implement FUA by
1717 * performing synchronous output. */
1718 if ((fsg->cmnd[1] & ~0x18) != 0) {
1719 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1720 return -EINVAL;
1721 }
1722 if (fsg->cmnd[1] & 0x08) // FUA
1723 curlun->filp->f_flags |= O_SYNC;
1724 }
1725 if (lba >= curlun->num_sectors) {
1726 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1727 return -EINVAL;
1728 }
1729
1730 /* Carry out the file writes */
1731 get_some_more = 1;
1732 file_offset = usb_offset = ((loff_t) lba) << 9;
1733 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1734
1735 while (amount_left_to_write > 0) {
1736
1737 /* Queue a request for more data from the host */
1738 bh = fsg->next_buffhd_to_fill;
1739 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1740
1741 /* Figure out how much we want to get:
1742 * Try to get the remaining amount.
1743 * But don't get more than the buffer size.
1744 * And don't try to go past the end of the file.
1745 * If we're not at a page boundary,
1746 * don't go past the next page.
1747 * If this means getting 0, then we were asked
1748 * to write past the end of file.
1749 * Finally, round down to a block boundary. */
1750 amount = min(amount_left_to_req, mod_data.buflen);
1751 amount = min((loff_t) amount, curlun->file_length -
1752 usb_offset);
1753 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1754 if (partial_page > 0)
1755 amount = min(amount,
1756 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1757
1758 if (amount == 0) {
1759 get_some_more = 0;
1760 curlun->sense_data =
1761 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1762 curlun->sense_data_info = usb_offset >> 9;
1763 continue;
1764 }
1765 amount -= (amount & 511);
1766 if (amount == 0) {
1767
1768 /* Why were we were asked to transfer a
1769 * partial block? */
1770 get_some_more = 0;
1771 continue;
1772 }
1773
1774 /* Get the next buffer */
1775 usb_offset += amount;
1776 fsg->usb_amount_left -= amount;
1777 amount_left_to_req -= amount;
1778 if (amount_left_to_req == 0)
1779 get_some_more = 0;
1780
1781 /* amount is always divisible by 512, hence by
1782 * the bulk-out maxpacket size */
1783 bh->outreq->length = bh->bulk_out_intended_length =
1784 amount;
1785 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1786 &bh->outreq_busy, &bh->state);
1787 fsg->next_buffhd_to_fill = bh->next;
1788 continue;
1789 }
1790
1791 /* Write the received data to the backing file */
1792 bh = fsg->next_buffhd_to_drain;
1793 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1794 break; // We stopped early
1795 if (bh->state == BUF_STATE_FULL) {
1796 fsg->next_buffhd_to_drain = bh->next;
1797 bh->state = BUF_STATE_EMPTY;
1798
1799 /* Did something go wrong with the transfer? */
1800 if (bh->outreq->status != 0) {
1801 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1802 curlun->sense_data_info = file_offset >> 9;
1803 break;
1804 }
1805
1806 amount = bh->outreq->actual;
1807 if (curlun->file_length - file_offset < amount) {
1808 LERROR(curlun,
1809 "write %u @ %llu beyond end %llu\n",
1810 amount, (unsigned long long) file_offset,
1811 (unsigned long long) curlun->file_length);
1812 amount = curlun->file_length - file_offset;
1813 }
1814
1815 /* Perform the write */
1816 file_offset_tmp = file_offset;
1817 nwritten = vfs_write(curlun->filp,
1818 (char __user *) bh->buf,
1819 amount, &file_offset_tmp);
1820 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1821 (unsigned long long) file_offset,
1822 (int) nwritten);
1823 if (signal_pending(current))
1824 return -EINTR; // Interrupted!
1825
1826 if (nwritten < 0) {
1827 LDBG(curlun, "error in file write: %d\n",
1828 (int) nwritten);
1829 nwritten = 0;
1830 } else if (nwritten < amount) {
1831 LDBG(curlun, "partial file write: %d/%u\n",
1832 (int) nwritten, amount);
1833 nwritten -= (nwritten & 511);
1834 // Round down to a block
1835 }
1836 file_offset += nwritten;
1837 amount_left_to_write -= nwritten;
1838 fsg->residue -= nwritten;
1839
1840 /* If an error occurred, report it and its position */
1841 if (nwritten < amount) {
1842 curlun->sense_data = SS_WRITE_ERROR;
1843 curlun->sense_data_info = file_offset >> 9;
1844 break;
1845 }
1846
1847 /* Did the host decide to stop early? */
1848 if (bh->outreq->actual != bh->outreq->length) {
1849 fsg->short_packet_received = 1;
1850 break;
1851 }
1852 continue;
1853 }
1854
1855 /* Wait for something to happen */
1856 if ((rc = sleep_thread(fsg)) != 0)
1857 return rc;
1858 }
1859
1860 return -EIO; // No default reply
1861}
1862
1863
1864/*-------------------------------------------------------------------------*/
1865
1866/* Sync the file data, don't bother with the metadata.
1867 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1868static int fsync_sub(struct lun *curlun)
1869{
1870 struct file *filp = curlun->filp;
1871 struct inode *inode;
1872 int rc, err;
1873
1874 if (curlun->ro || !filp)
1875 return 0;
1876 if (!filp->f_op->fsync)
1877 return -EINVAL;
1878
1879 inode = filp->f_dentry->d_inode;
1880 down(&inode->i_sem);
1881 current->flags |= PF_SYNCWRITE;
1882 rc = filemap_fdatawrite(inode->i_mapping);
1883 err = filp->f_op->fsync(filp, filp->f_dentry, 1);
1884 if (!rc)
1885 rc = err;
1886 err = filemap_fdatawait(inode->i_mapping);
1887 if (!rc)
1888 rc = err;
1889 current->flags &= ~PF_SYNCWRITE;
1890 up(&inode->i_sem);
1891 VLDBG(curlun, "fdatasync -> %d\n", rc);
1892 return rc;
1893}
1894
1895static void fsync_all(struct fsg_dev *fsg)
1896{
1897 int i;
1898
1899 for (i = 0; i < fsg->nluns; ++i)
1900 fsync_sub(&fsg->luns[i]);
1901}
1902
1903static int do_synchronize_cache(struct fsg_dev *fsg)
1904{
1905 struct lun *curlun = fsg->curlun;
1906 int rc;
1907
1908 /* We ignore the requested LBA and write out all file's
1909 * dirty data buffers. */
1910 rc = fsync_sub(curlun);
1911 if (rc)
1912 curlun->sense_data = SS_WRITE_ERROR;
1913 return 0;
1914}
1915
1916
1917/*-------------------------------------------------------------------------*/
1918
1919static void invalidate_sub(struct lun *curlun)
1920{
1921 struct file *filp = curlun->filp;
1922 struct inode *inode = filp->f_dentry->d_inode;
1923 unsigned long rc;
1924
1925 rc = invalidate_inode_pages(inode->i_mapping);
1926 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1927}
1928
1929static int do_verify(struct fsg_dev *fsg)
1930{
1931 struct lun *curlun = fsg->curlun;
1932 u32 lba;
1933 u32 verification_length;
1934 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1935 loff_t file_offset, file_offset_tmp;
1936 u32 amount_left;
1937 unsigned int amount;
1938 ssize_t nread;
1939
1940 /* Get the starting Logical Block Address and check that it's
1941 * not too big */
1942 lba = get_be32(&fsg->cmnd[2]);
1943 if (lba >= curlun->num_sectors) {
1944 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1945 return -EINVAL;
1946 }
1947
1948 /* We allow DPO (Disable Page Out = don't save data in the
1949 * cache) but we don't implement it. */
1950 if ((fsg->cmnd[1] & ~0x10) != 0) {
1951 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1952 return -EINVAL;
1953 }
1954
1955 verification_length = get_be16(&fsg->cmnd[7]);
1956 if (unlikely(verification_length == 0))
1957 return -EIO; // No default reply
1958
1959 /* Prepare to carry out the file verify */
1960 amount_left = verification_length << 9;
1961 file_offset = ((loff_t) lba) << 9;
1962
1963 /* Write out all the dirty buffers before invalidating them */
1964 fsync_sub(curlun);
1965 if (signal_pending(current))
1966 return -EINTR;
1967
1968 invalidate_sub(curlun);
1969 if (signal_pending(current))
1970 return -EINTR;
1971
1972 /* Just try to read the requested blocks */
1973 while (amount_left > 0) {
1974
1975 /* Figure out how much we need to read:
1976 * Try to read the remaining amount, but not more than
1977 * the buffer size.
1978 * And don't try to read past the end of the file.
1979 * If this means reading 0 then we were asked to read
1980 * past the end of file. */
1981 amount = min((unsigned int) amount_left, mod_data.buflen);
1982 amount = min((loff_t) amount,
1983 curlun->file_length - file_offset);
1984 if (amount == 0) {
1985 curlun->sense_data =
1986 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1987 curlun->sense_data_info = file_offset >> 9;
1988 break;
1989 }
1990
1991 /* Perform the read */
1992 file_offset_tmp = file_offset;
1993 nread = vfs_read(curlun->filp,
1994 (char __user *) bh->buf,
1995 amount, &file_offset_tmp);
1996 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1997 (unsigned long long) file_offset,
1998 (int) nread);
1999 if (signal_pending(current))
2000 return -EINTR;
2001
2002 if (nread < 0) {
2003 LDBG(curlun, "error in file verify: %d\n",
2004 (int) nread);
2005 nread = 0;
2006 } else if (nread < amount) {
2007 LDBG(curlun, "partial file verify: %d/%u\n",
2008 (int) nread, amount);
2009 nread -= (nread & 511); // Round down to a sector
2010 }
2011 if (nread == 0) {
2012 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2013 curlun->sense_data_info = file_offset >> 9;
2014 break;
2015 }
2016 file_offset += nread;
2017 amount_left -= nread;
2018 }
2019 return 0;
2020}
2021
2022
2023/*-------------------------------------------------------------------------*/
2024
2025static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2026{
2027 u8 *buf = (u8 *) bh->buf;
2028
2029 static char vendor_id[] = "Linux ";
2030 static char product_id[] = "File-Stor Gadget";
2031
2032 if (!fsg->curlun) { // Unsupported LUNs are okay
2033 fsg->bad_lun_okay = 1;
2034 memset(buf, 0, 36);
2035 buf[0] = 0x7f; // Unsupported, no device-type
2036 return 36;
2037 }
2038
2039 memset(buf, 0, 8); // Non-removable, direct-access device
2040 if (mod_data.removable)
2041 buf[1] = 0x80;
2042 buf[2] = 2; // ANSI SCSI level 2
2043 buf[3] = 2; // SCSI-2 INQUIRY data format
2044 buf[4] = 31; // Additional length
2045 // No special options
2046 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2047 mod_data.release);
2048 return 36;
2049}
2050
2051
2052static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2053{
2054 struct lun *curlun = fsg->curlun;
2055 u8 *buf = (u8 *) bh->buf;
2056 u32 sd, sdinfo;
2057
2058 /*
2059 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2060 *
2061 * If a REQUEST SENSE command is received from an initiator
2062 * with a pending unit attention condition (before the target
2063 * generates the contingent allegiance condition), then the
2064 * target shall either:
2065 * a) report any pending sense data and preserve the unit
2066 * attention condition on the logical unit, or,
2067 * b) report the unit attention condition, may discard any
2068 * pending sense data, and clear the unit attention
2069 * condition on the logical unit for that initiator.
2070 *
2071 * FSG normally uses option a); enable this code to use option b).
2072 */
2073#if 0
2074 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2075 curlun->sense_data = curlun->unit_attention_data;
2076 curlun->unit_attention_data = SS_NO_SENSE;
2077 }
2078#endif
2079
2080 if (!curlun) { // Unsupported LUNs are okay
2081 fsg->bad_lun_okay = 1;
2082 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2083 sdinfo = 0;
2084 } else {
2085 sd = curlun->sense_data;
2086 sdinfo = curlun->sense_data_info;
2087 curlun->sense_data = SS_NO_SENSE;
2088 curlun->sense_data_info = 0;
2089 }
2090
2091 memset(buf, 0, 18);
2092 buf[0] = 0x80 | 0x70; // Valid, current error
2093 buf[2] = SK(sd);
2094 put_be32(&buf[3], sdinfo); // Sense information
2095 buf[7] = 18 - 8; // Additional sense length
2096 buf[12] = ASC(sd);
2097 buf[13] = ASCQ(sd);
2098 return 18;
2099}
2100
2101
2102static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2103{
2104 struct lun *curlun = fsg->curlun;
2105 u32 lba = get_be32(&fsg->cmnd[2]);
2106 int pmi = fsg->cmnd[8];
2107 u8 *buf = (u8 *) bh->buf;
2108
2109 /* Check the PMI and LBA fields */
2110 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2111 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2112 return -EINVAL;
2113 }
2114
2115 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2116 put_be32(&buf[4], 512); // Block length
2117 return 8;
2118}
2119
2120
2121static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2122{
2123 struct lun *curlun = fsg->curlun;
2124 int mscmnd = fsg->cmnd[0];
2125 u8 *buf = (u8 *) bh->buf;
2126 u8 *buf0 = buf;
2127 int pc, page_code;
2128 int changeable_values, all_pages;
2129 int valid_page = 0;
2130 int len, limit;
2131
2132 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2133 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2134 return -EINVAL;
2135 }
2136 pc = fsg->cmnd[2] >> 6;
2137 page_code = fsg->cmnd[2] & 0x3f;
2138 if (pc == 3) {
2139 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2140 return -EINVAL;
2141 }
2142 changeable_values = (pc == 1);
2143 all_pages = (page_code == 0x3f);
2144
2145 /* Write the mode parameter header. Fixed values are: default
2146 * medium type, no cache control (DPOFUA), and no block descriptors.
2147 * The only variable value is the WriteProtect bit. We will fill in
2148 * the mode data length later. */
2149 memset(buf, 0, 8);
2150 if (mscmnd == SC_MODE_SENSE_6) {
2151 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2152 buf += 4;
2153 limit = 255;
2154 } else { // SC_MODE_SENSE_10
2155 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2156 buf += 8;
2157 limit = 65535; // Should really be mod_data.buflen
2158 }
2159
2160 /* No block descriptors */
2161
2162 /* The mode pages, in numerical order. The only page we support
2163 * is the Caching page. */
2164 if (page_code == 0x08 || all_pages) {
2165 valid_page = 1;
2166 buf[0] = 0x08; // Page code
2167 buf[1] = 10; // Page length
2168 memset(buf+2, 0, 10); // None of the fields are changeable
2169
2170 if (!changeable_values) {
2171 buf[2] = 0x04; // Write cache enable,
2172 // Read cache not disabled
2173 // No cache retention priorities
2174 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2175 // Minimum prefetch = 0
2176 put_be16(&buf[8], 0xffff); // Maximum prefetch
2177 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2178 }
2179 buf += 12;
2180 }
2181
2182 /* Check that a valid page was requested and the mode data length
2183 * isn't too long. */
2184 len = buf - buf0;
2185 if (!valid_page || len > limit) {
2186 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2187 return -EINVAL;
2188 }
2189
2190 /* Store the mode data length */
2191 if (mscmnd == SC_MODE_SENSE_6)
2192 buf0[0] = len - 1;
2193 else
2194 put_be16(buf0, len - 2);
2195 return len;
2196}
2197
2198
2199static int do_start_stop(struct fsg_dev *fsg)
2200{
2201 struct lun *curlun = fsg->curlun;
2202 int loej, start;
2203
2204 if (!mod_data.removable) {
2205 curlun->sense_data = SS_INVALID_COMMAND;
2206 return -EINVAL;
2207 }
2208
2209 // int immed = fsg->cmnd[1] & 0x01;
2210 loej = fsg->cmnd[4] & 0x02;
2211 start = fsg->cmnd[4] & 0x01;
2212
2213#ifdef CONFIG_USB_FILE_STORAGE_TEST
2214 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2215 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2216 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2217 return -EINVAL;
2218 }
2219
2220 if (!start) {
2221
2222 /* Are we allowed to unload the media? */
2223 if (curlun->prevent_medium_removal) {
2224 LDBG(curlun, "unload attempt prevented\n");
2225 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2226 return -EINVAL;
2227 }
2228 if (loej) { // Simulate an unload/eject
2229 up_read(&fsg->filesem);
2230 down_write(&fsg->filesem);
2231 close_backing_file(curlun);
2232 up_write(&fsg->filesem);
2233 down_read(&fsg->filesem);
2234 }
2235 } else {
2236
2237 /* Our emulation doesn't support mounting; the medium is
2238 * available for use as soon as it is loaded. */
2239 if (!backing_file_is_open(curlun)) {
2240 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2241 return -EINVAL;
2242 }
2243 }
2244#endif
2245 return 0;
2246}
2247
2248
2249static int do_prevent_allow(struct fsg_dev *fsg)
2250{
2251 struct lun *curlun = fsg->curlun;
2252 int prevent;
2253
2254 if (!mod_data.removable) {
2255 curlun->sense_data = SS_INVALID_COMMAND;
2256 return -EINVAL;
2257 }
2258
2259 prevent = fsg->cmnd[4] & 0x01;
2260 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2261 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2262 return -EINVAL;
2263 }
2264
2265 if (curlun->prevent_medium_removal && !prevent)
2266 fsync_sub(curlun);
2267 curlun->prevent_medium_removal = prevent;
2268 return 0;
2269}
2270
2271
2272static int do_read_format_capacities(struct fsg_dev *fsg,
2273 struct fsg_buffhd *bh)
2274{
2275 struct lun *curlun = fsg->curlun;
2276 u8 *buf = (u8 *) bh->buf;
2277
2278 buf[0] = buf[1] = buf[2] = 0;
2279 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2280 buf += 4;
2281
2282 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2283 put_be32(&buf[4], 512); // Block length
2284 buf[4] = 0x02; // Current capacity
2285 return 12;
2286}
2287
2288
2289static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2290{
2291 struct lun *curlun = fsg->curlun;
2292
2293 /* We don't support MODE SELECT */
2294 curlun->sense_data = SS_INVALID_COMMAND;
2295 return -EINVAL;
2296}
2297
2298
2299/*-------------------------------------------------------------------------*/
2300
2301static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2302{
2303 int rc;
2304
2305 rc = fsg_set_halt(fsg, fsg->bulk_in);
2306 if (rc == -EAGAIN)
2307 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2308 while (rc != 0) {
2309 if (rc != -EAGAIN) {
2310 WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
2311 rc = 0;
2312 break;
2313 }
2314
2315 /* Wait for a short time and then try again */
2316 if (msleep_interruptible(100) != 0)
2317 return -EINTR;
2318 rc = usb_ep_set_halt(fsg->bulk_in);
2319 }
2320 return rc;
2321}
2322
2323static int pad_with_zeros(struct fsg_dev *fsg)
2324{
2325 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2326 u32 nkeep = bh->inreq->length;
2327 u32 nsend;
2328 int rc;
2329
2330 bh->state = BUF_STATE_EMPTY; // For the first iteration
2331 fsg->usb_amount_left = nkeep + fsg->residue;
2332 while (fsg->usb_amount_left > 0) {
2333
2334 /* Wait for the next buffer to be free */
2335 while (bh->state != BUF_STATE_EMPTY) {
2336 if ((rc = sleep_thread(fsg)) != 0)
2337 return rc;
2338 }
2339
2340 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2341 memset(bh->buf + nkeep, 0, nsend - nkeep);
2342 bh->inreq->length = nsend;
2343 bh->inreq->zero = 0;
2344 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2345 &bh->inreq_busy, &bh->state);
2346 bh = fsg->next_buffhd_to_fill = bh->next;
2347 fsg->usb_amount_left -= nsend;
2348 nkeep = 0;
2349 }
2350 return 0;
2351}
2352
2353static int throw_away_data(struct fsg_dev *fsg)
2354{
2355 struct fsg_buffhd *bh;
2356 u32 amount;
2357 int rc;
2358
2359 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2360 fsg->usb_amount_left > 0) {
2361
2362 /* Throw away the data in a filled buffer */
2363 if (bh->state == BUF_STATE_FULL) {
2364 bh->state = BUF_STATE_EMPTY;
2365 fsg->next_buffhd_to_drain = bh->next;
2366
2367 /* A short packet or an error ends everything */
2368 if (bh->outreq->actual != bh->outreq->length ||
2369 bh->outreq->status != 0) {
2370 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2371 return -EINTR;
2372 }
2373 continue;
2374 }
2375
2376 /* Try to submit another request if we need one */
2377 bh = fsg->next_buffhd_to_fill;
2378 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2379 amount = min(fsg->usb_amount_left,
2380 (u32) mod_data.buflen);
2381
2382 /* amount is always divisible by 512, hence by
2383 * the bulk-out maxpacket size */
2384 bh->outreq->length = bh->bulk_out_intended_length =
2385 amount;
2386 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2387 &bh->outreq_busy, &bh->state);
2388 fsg->next_buffhd_to_fill = bh->next;
2389 fsg->usb_amount_left -= amount;
2390 continue;
2391 }
2392
2393 /* Otherwise wait for something to happen */
2394 if ((rc = sleep_thread(fsg)) != 0)
2395 return rc;
2396 }
2397 return 0;
2398}
2399
2400
2401static int finish_reply(struct fsg_dev *fsg)
2402{
2403 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2404 int rc = 0;
2405
2406 switch (fsg->data_dir) {
2407 case DATA_DIR_NONE:
2408 break; // Nothing to send
2409
2410 /* If we don't know whether the host wants to read or write,
2411 * this must be CB or CBI with an unknown command. We mustn't
2412 * try to send or receive any data. So stall both bulk pipes
2413 * if we can and wait for a reset. */
2414 case DATA_DIR_UNKNOWN:
2415 if (mod_data.can_stall) {
2416 fsg_set_halt(fsg, fsg->bulk_out);
2417 rc = halt_bulk_in_endpoint(fsg);
2418 }
2419 break;
2420
2421 /* All but the last buffer of data must have already been sent */
2422 case DATA_DIR_TO_HOST:
2423 if (fsg->data_size == 0)
2424 ; // Nothing to send
2425
2426 /* If there's no residue, simply send the last buffer */
2427 else if (fsg->residue == 0) {
2428 bh->inreq->zero = 0;
2429 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2430 &bh->inreq_busy, &bh->state);
2431 fsg->next_buffhd_to_fill = bh->next;
2432 }
2433
2434 /* There is a residue. For CB and CBI, simply mark the end
2435 * of the data with a short packet. However, if we are
2436 * allowed to stall, there was no data at all (residue ==
2437 * data_size), and the command failed (invalid LUN or
2438 * sense data is set), then halt the bulk-in endpoint
2439 * instead. */
2440 else if (!transport_is_bbb()) {
2441 if (mod_data.can_stall &&
2442 fsg->residue == fsg->data_size &&
2443 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2444 bh->state = BUF_STATE_EMPTY;
2445 rc = halt_bulk_in_endpoint(fsg);
2446 } else {
2447 bh->inreq->zero = 1;
2448 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2449 &bh->inreq_busy, &bh->state);
2450 fsg->next_buffhd_to_fill = bh->next;
2451 }
2452 }
2453
2454 /* For Bulk-only, if we're allowed to stall then send the
2455 * short packet and halt the bulk-in endpoint. If we can't
2456 * stall, pad out the remaining data with 0's. */
2457 else {
2458 if (mod_data.can_stall) {
2459 bh->inreq->zero = 1;
2460 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2461 &bh->inreq_busy, &bh->state);
2462 fsg->next_buffhd_to_fill = bh->next;
2463 rc = halt_bulk_in_endpoint(fsg);
2464 } else
2465 rc = pad_with_zeros(fsg);
2466 }
2467 break;
2468
2469 /* We have processed all we want from the data the host has sent.
2470 * There may still be outstanding bulk-out requests. */
2471 case DATA_DIR_FROM_HOST:
2472 if (fsg->residue == 0)
2473 ; // Nothing to receive
2474
2475 /* Did the host stop sending unexpectedly early? */
2476 else if (fsg->short_packet_received) {
2477 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2478 rc = -EINTR;
2479 }
2480
2481 /* We haven't processed all the incoming data. Even though
2482 * we may be allowed to stall, doing so would cause a race.
2483 * The controller may already have ACK'ed all the remaining
2484 * bulk-out packets, in which case the host wouldn't see a
2485 * STALL. Not realizing the endpoint was halted, it wouldn't
2486 * clear the halt -- leading to problems later on. */
2487#if 0
2488 else if (mod_data.can_stall) {
2489 fsg_set_halt(fsg, fsg->bulk_out);
2490 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2491 rc = -EINTR;
2492 }
2493#endif
2494
2495 /* We can't stall. Read in the excess data and throw it
2496 * all away. */
2497 else
2498 rc = throw_away_data(fsg);
2499 break;
2500 }
2501 return rc;
2502}
2503
2504
2505static int send_status(struct fsg_dev *fsg)
2506{
2507 struct lun *curlun = fsg->curlun;
2508 struct fsg_buffhd *bh;
2509 int rc;
2510 u8 status = USB_STATUS_PASS;
2511 u32 sd, sdinfo = 0;
2512
2513 /* Wait for the next buffer to become available */
2514 bh = fsg->next_buffhd_to_fill;
2515 while (bh->state != BUF_STATE_EMPTY) {
2516 if ((rc = sleep_thread(fsg)) != 0)
2517 return rc;
2518 }
2519
2520 if (curlun) {
2521 sd = curlun->sense_data;
2522 sdinfo = curlun->sense_data_info;
2523 } else if (fsg->bad_lun_okay)
2524 sd = SS_NO_SENSE;
2525 else
2526 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2527
2528 if (fsg->phase_error) {
2529 DBG(fsg, "sending phase-error status\n");
2530 status = USB_STATUS_PHASE_ERROR;
2531 sd = SS_INVALID_COMMAND;
2532 } else if (sd != SS_NO_SENSE) {
2533 DBG(fsg, "sending command-failure status\n");
2534 status = USB_STATUS_FAIL;
2535 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2536 " info x%x\n",
2537 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2538 }
2539
2540 if (transport_is_bbb()) {
2541 struct bulk_cs_wrap *csw = (struct bulk_cs_wrap *) bh->buf;
2542
2543 /* Store and send the Bulk-only CSW */
2544 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2545 csw->Tag = fsg->tag;
2546 csw->Residue = cpu_to_le32(fsg->residue);
2547 csw->Status = status;
2548
2549 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2550 bh->inreq->zero = 0;
2551 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2552 &bh->inreq_busy, &bh->state);
2553
2554 } else if (mod_data.transport_type == USB_PR_CB) {
2555
2556 /* Control-Bulk transport has no status phase! */
2557 return 0;
2558
2559 } else { // USB_PR_CBI
2560 struct interrupt_data *buf = (struct interrupt_data *)
2561 bh->buf;
2562
2563 /* Store and send the Interrupt data. UFI sends the ASC
2564 * and ASCQ bytes. Everything else sends a Type (which
2565 * is always 0) and the status Value. */
2566 if (mod_data.protocol_type == USB_SC_UFI) {
2567 buf->bType = ASC(sd);
2568 buf->bValue = ASCQ(sd);
2569 } else {
2570 buf->bType = 0;
2571 buf->bValue = status;
2572 }
2573 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2574
2575 fsg->intr_buffhd = bh; // Point to the right buffhd
2576 fsg->intreq->buf = bh->inreq->buf;
2577 fsg->intreq->dma = bh->inreq->dma;
2578 fsg->intreq->context = bh;
2579 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2580 &fsg->intreq_busy, &bh->state);
2581 }
2582
2583 fsg->next_buffhd_to_fill = bh->next;
2584 return 0;
2585}
2586
2587
2588/*-------------------------------------------------------------------------*/
2589
2590/* Check whether the command is properly formed and whether its data size
2591 * and direction agree with the values we already have. */
2592static int check_command(struct fsg_dev *fsg, int cmnd_size,
2593 enum data_direction data_dir, unsigned int mask,
2594 int needs_medium, const char *name)
2595{
2596 int i;
2597 int lun = fsg->cmnd[1] >> 5;
2598 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2599 char hdlen[20];
2600 struct lun *curlun;
2601
2602 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2603 * Transparent SCSI doesn't pad. */
2604 if (protocol_is_scsi())
2605 ;
2606
2607 /* There's some disagreement as to whether RBC pads commands or not.
2608 * We'll play it safe and accept either form. */
2609 else if (mod_data.protocol_type == USB_SC_RBC) {
2610 if (fsg->cmnd_size == 12)
2611 cmnd_size = 12;
2612
2613 /* All the other protocols pad to 12 bytes */
2614 } else
2615 cmnd_size = 12;
2616
2617 hdlen[0] = 0;
2618 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2619 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2620 fsg->data_size);
2621 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2622 name, cmnd_size, dirletter[(int) data_dir],
2623 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2624
2625 /* We can't reply at all until we know the correct data direction
2626 * and size. */
2627 if (fsg->data_size_from_cmnd == 0)
2628 data_dir = DATA_DIR_NONE;
2629 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2630 fsg->data_dir = data_dir;
2631 fsg->data_size = fsg->data_size_from_cmnd;
2632
2633 } else { // Bulk-only
2634 if (fsg->data_size < fsg->data_size_from_cmnd) {
2635
2636 /* Host data size < Device data size is a phase error.
2637 * Carry out the command, but only transfer as much
2638 * as we are allowed. */
2639 fsg->data_size_from_cmnd = fsg->data_size;
2640 fsg->phase_error = 1;
2641 }
2642 }
2643 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2644
2645 /* Conflicting data directions is a phase error */
2646 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2647 fsg->phase_error = 1;
2648 return -EINVAL;
2649 }
2650
2651 /* Verify the length of the command itself */
2652 if (cmnd_size != fsg->cmnd_size) {
2653
2654 /* Special case workaround: MS-Windows issues REQUEST SENSE
2655 * with cbw->Length == 12 (it should be 6). */
2656 if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2657 cmnd_size = fsg->cmnd_size;
2658 else {
2659 fsg->phase_error = 1;
2660 return -EINVAL;
2661 }
2662 }
2663
2664 /* Check that the LUN values are oonsistent */
2665 if (transport_is_bbb()) {
2666 if (fsg->lun != lun)
2667 DBG(fsg, "using LUN %d from CBW, "
2668 "not LUN %d from CDB\n",
2669 fsg->lun, lun);
2670 } else
2671 fsg->lun = lun; // Use LUN from the command
2672
2673 /* Check the LUN */
2674 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2675 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2676 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2677 curlun->sense_data = SS_NO_SENSE;
2678 curlun->sense_data_info = 0;
2679 }
2680 } else {
2681 fsg->curlun = curlun = NULL;
2682 fsg->bad_lun_okay = 0;
2683
2684 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2685 * to use unsupported LUNs; all others may not. */
2686 if (fsg->cmnd[0] != SC_INQUIRY &&
2687 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2688 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2689 return -EINVAL;
2690 }
2691 }
2692
2693 /* If a unit attention condition exists, only INQUIRY and
2694 * REQUEST SENSE commands are allowed; anything else must fail. */
2695 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2696 fsg->cmnd[0] != SC_INQUIRY &&
2697 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2698 curlun->sense_data = curlun->unit_attention_data;
2699 curlun->unit_attention_data = SS_NO_SENSE;
2700 return -EINVAL;
2701 }
2702
2703 /* Check that only command bytes listed in the mask are non-zero */
2704 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2705 for (i = 1; i < cmnd_size; ++i) {
2706 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2707 if (curlun)
2708 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2709 return -EINVAL;
2710 }
2711 }
2712
2713 /* If the medium isn't mounted and the command needs to access
2714 * it, return an error. */
2715 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2716 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2717 return -EINVAL;
2718 }
2719
2720 return 0;
2721}
2722
2723
2724static int do_scsi_command(struct fsg_dev *fsg)
2725{
2726 struct fsg_buffhd *bh;
2727 int rc;
2728 int reply = -EINVAL;
2729 int i;
2730 static char unknown[16];
2731
2732 dump_cdb(fsg);
2733
2734 /* Wait for the next buffer to become available for data or status */
2735 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2736 while (bh->state != BUF_STATE_EMPTY) {
2737 if ((rc = sleep_thread(fsg)) != 0)
2738 return rc;
2739 }
2740 fsg->phase_error = 0;
2741 fsg->short_packet_received = 0;
2742
2743 down_read(&fsg->filesem); // We're using the backing file
2744 switch (fsg->cmnd[0]) {
2745
2746 case SC_INQUIRY:
2747 fsg->data_size_from_cmnd = fsg->cmnd[4];
2748 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2749 (1<<4), 0,
2750 "INQUIRY")) == 0)
2751 reply = do_inquiry(fsg, bh);
2752 break;
2753
2754 case SC_MODE_SELECT_6:
2755 fsg->data_size_from_cmnd = fsg->cmnd[4];
2756 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2757 (1<<1) | (1<<4), 0,
2758 "MODE SELECT(6)")) == 0)
2759 reply = do_mode_select(fsg, bh);
2760 break;
2761
2762 case SC_MODE_SELECT_10:
2763 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2764 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2765 (1<<1) | (3<<7), 0,
2766 "MODE SELECT(10)")) == 0)
2767 reply = do_mode_select(fsg, bh);
2768 break;
2769
2770 case SC_MODE_SENSE_6:
2771 fsg->data_size_from_cmnd = fsg->cmnd[4];
2772 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2773 (1<<1) | (1<<2) | (1<<4), 0,
2774 "MODE SENSE(6)")) == 0)
2775 reply = do_mode_sense(fsg, bh);
2776 break;
2777
2778 case SC_MODE_SENSE_10:
2779 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2780 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2781 (1<<1) | (1<<2) | (3<<7), 0,
2782 "MODE SENSE(10)")) == 0)
2783 reply = do_mode_sense(fsg, bh);
2784 break;
2785
2786 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2787 fsg->data_size_from_cmnd = 0;
2788 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2789 (1<<4), 0,
2790 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2791 reply = do_prevent_allow(fsg);
2792 break;
2793
2794 case SC_READ_6:
2795 i = fsg->cmnd[4];
2796 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2797 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2798 (7<<1) | (1<<4), 1,
2799 "READ(6)")) == 0)
2800 reply = do_read(fsg);
2801 break;
2802
2803 case SC_READ_10:
2804 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2805 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2806 (1<<1) | (0xf<<2) | (3<<7), 1,
2807 "READ(10)")) == 0)
2808 reply = do_read(fsg);
2809 break;
2810
2811 case SC_READ_12:
2812 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2813 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2814 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2815 "READ(12)")) == 0)
2816 reply = do_read(fsg);
2817 break;
2818
2819 case SC_READ_CAPACITY:
2820 fsg->data_size_from_cmnd = 8;
2821 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2822 (0xf<<2) | (1<<8), 1,
2823 "READ CAPACITY")) == 0)
2824 reply = do_read_capacity(fsg, bh);
2825 break;
2826
2827 case SC_READ_FORMAT_CAPACITIES:
2828 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2829 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2830 (3<<7), 1,
2831 "READ FORMAT CAPACITIES")) == 0)
2832 reply = do_read_format_capacities(fsg, bh);
2833 break;
2834
2835 case SC_REQUEST_SENSE:
2836 fsg->data_size_from_cmnd = fsg->cmnd[4];
2837 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2838 (1<<4), 0,
2839 "REQUEST SENSE")) == 0)
2840 reply = do_request_sense(fsg, bh);
2841 break;
2842
2843 case SC_START_STOP_UNIT:
2844 fsg->data_size_from_cmnd = 0;
2845 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2846 (1<<1) | (1<<4), 0,
2847 "START-STOP UNIT")) == 0)
2848 reply = do_start_stop(fsg);
2849 break;
2850
2851 case SC_SYNCHRONIZE_CACHE:
2852 fsg->data_size_from_cmnd = 0;
2853 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2854 (0xf<<2) | (3<<7), 1,
2855 "SYNCHRONIZE CACHE")) == 0)
2856 reply = do_synchronize_cache(fsg);
2857 break;
2858
2859 case SC_TEST_UNIT_READY:
2860 fsg->data_size_from_cmnd = 0;
2861 reply = check_command(fsg, 6, DATA_DIR_NONE,
2862 0, 1,
2863 "TEST UNIT READY");
2864 break;
2865
2866 /* Although optional, this command is used by MS-Windows. We
2867 * support a minimal version: BytChk must be 0. */
2868 case SC_VERIFY:
2869 fsg->data_size_from_cmnd = 0;
2870 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2871 (1<<1) | (0xf<<2) | (3<<7), 1,
2872 "VERIFY")) == 0)
2873 reply = do_verify(fsg);
2874 break;
2875
2876 case SC_WRITE_6:
2877 i = fsg->cmnd[4];
2878 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2879 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2880 (7<<1) | (1<<4), 1,
2881 "WRITE(6)")) == 0)
2882 reply = do_write(fsg);
2883 break;
2884
2885 case SC_WRITE_10:
2886 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2887 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2888 (1<<1) | (0xf<<2) | (3<<7), 1,
2889 "WRITE(10)")) == 0)
2890 reply = do_write(fsg);
2891 break;
2892
2893 case SC_WRITE_12:
2894 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2895 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2896 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2897 "WRITE(12)")) == 0)
2898 reply = do_write(fsg);
2899 break;
2900
2901 /* Some mandatory commands that we recognize but don't implement.
2902 * They don't mean much in this setting. It's left as an exercise
2903 * for anyone interested to implement RESERVE and RELEASE in terms
2904 * of Posix locks. */
2905 case SC_FORMAT_UNIT:
2906 case SC_RELEASE:
2907 case SC_RESERVE:
2908 case SC_SEND_DIAGNOSTIC:
2909 // Fall through
2910
2911 default:
2912 fsg->data_size_from_cmnd = 0;
2913 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2914 if ((reply = check_command(fsg, fsg->cmnd_size,
2915 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2916 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2917 reply = -EINVAL;
2918 }
2919 break;
2920 }
2921 up_read(&fsg->filesem);
2922
2923 if (reply == -EINTR || signal_pending(current))
2924 return -EINTR;
2925
2926 /* Set up the single reply buffer for finish_reply() */
2927 if (reply == -EINVAL)
2928 reply = 0; // Error reply length
2929 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2930 reply = min((u32) reply, fsg->data_size_from_cmnd);
2931 bh->inreq->length = reply;
2932 bh->state = BUF_STATE_FULL;
2933 fsg->residue -= reply;
2934 } // Otherwise it's already set
2935
2936 return 0;
2937}
2938
2939
2940/*-------------------------------------------------------------------------*/
2941
2942static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2943{
2944 struct usb_request *req = bh->outreq;
2945 struct bulk_cb_wrap *cbw = (struct bulk_cb_wrap *) req->buf;
2946
2947 /* Was this a real packet? */
2948 if (req->status)
2949 return -EINVAL;
2950
2951 /* Is the CBW valid? */
2952 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2953 cbw->Signature != __constant_cpu_to_le32(
2954 USB_BULK_CB_SIG)) {
2955 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2956 req->actual,
2957 le32_to_cpu(cbw->Signature));
2958
2959 /* The Bulk-only spec says we MUST stall the bulk pipes!
2960 * If we want to avoid stalls, set a flag so that we will
2961 * clear the endpoint halts at the next reset. */
2962 if (!mod_data.can_stall)
2963 set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
2964 fsg_set_halt(fsg, fsg->bulk_out);
2965 halt_bulk_in_endpoint(fsg);
2966 return -EINVAL;
2967 }
2968
2969 /* Is the CBW meaningful? */
2970 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
2971 cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
2972 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
2973 "cmdlen %u\n",
2974 cbw->Lun, cbw->Flags, cbw->Length);
2975
2976 /* We can do anything we want here, so let's stall the
2977 * bulk pipes if we are allowed to. */
2978 if (mod_data.can_stall) {
2979 fsg_set_halt(fsg, fsg->bulk_out);
2980 halt_bulk_in_endpoint(fsg);
2981 }
2982 return -EINVAL;
2983 }
2984
2985 /* Save the command for later */
2986 fsg->cmnd_size = cbw->Length;
2987 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
2988 if (cbw->Flags & USB_BULK_IN_FLAG)
2989 fsg->data_dir = DATA_DIR_TO_HOST;
2990 else
2991 fsg->data_dir = DATA_DIR_FROM_HOST;
2992 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
2993 if (fsg->data_size == 0)
2994 fsg->data_dir = DATA_DIR_NONE;
2995 fsg->lun = cbw->Lun;
2996 fsg->tag = cbw->Tag;
2997 return 0;
2998}
2999
3000
3001static int get_next_command(struct fsg_dev *fsg)
3002{
3003 struct fsg_buffhd *bh;
3004 int rc = 0;
3005
3006 if (transport_is_bbb()) {
3007
3008 /* Wait for the next buffer to become available */
3009 bh = fsg->next_buffhd_to_fill;
3010 while (bh->state != BUF_STATE_EMPTY) {
3011 if ((rc = sleep_thread(fsg)) != 0)
3012 return rc;
3013 }
3014
3015 /* Queue a request to read a Bulk-only CBW */
3016 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3017 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3018 &bh->outreq_busy, &bh->state);
3019
3020 /* We will drain the buffer in software, which means we
3021 * can reuse it for the next filling. No need to advance
3022 * next_buffhd_to_fill. */
3023
3024 /* Wait for the CBW to arrive */
3025 while (bh->state != BUF_STATE_FULL) {
3026 if ((rc = sleep_thread(fsg)) != 0)
3027 return rc;
3028 }
3029 rc = received_cbw(fsg, bh);
3030 bh->state = BUF_STATE_EMPTY;
3031
3032 } else { // USB_PR_CB or USB_PR_CBI
3033
3034 /* Wait for the next command to arrive */
3035 while (fsg->cbbuf_cmnd_size == 0) {
3036 if ((rc = sleep_thread(fsg)) != 0)
3037 return rc;
3038 }
3039
3040 /* Is the previous status interrupt request still busy?
3041 * The host is allowed to skip reading the status,
3042 * so we must cancel it. */
3043 if (fsg->intreq_busy)
3044 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3045
3046 /* Copy the command and mark the buffer empty */
3047 fsg->data_dir = DATA_DIR_UNKNOWN;
3048 spin_lock_irq(&fsg->lock);
3049 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3050 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3051 fsg->cbbuf_cmnd_size = 0;
3052 spin_unlock_irq(&fsg->lock);
3053 }
3054 return rc;
3055}
3056
3057
3058/*-------------------------------------------------------------------------*/
3059
3060static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3061 const struct usb_endpoint_descriptor *d)
3062{
3063 int rc;
3064
3065 ep->driver_data = fsg;
3066 rc = usb_ep_enable(ep, d);
3067 if (rc)
3068 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3069 return rc;
3070}
3071
3072static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3073 struct usb_request **preq)
3074{
3075 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3076 if (*preq)
3077 return 0;
3078 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3079 return -ENOMEM;
3080}
3081
3082/*
3083 * Reset interface setting and re-init endpoint state (toggle etc).
3084 * Call with altsetting < 0 to disable the interface. The only other
3085 * available altsetting is 0, which enables the interface.
3086 */
3087static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3088{
3089 int rc = 0;
3090 int i;
3091 const struct usb_endpoint_descriptor *d;
3092
3093 if (fsg->running)
3094 DBG(fsg, "reset interface\n");
3095
3096reset:
3097 /* Deallocate the requests */
3098 for (i = 0; i < NUM_BUFFERS; ++i) {
3099 struct fsg_buffhd *bh = &fsg->buffhds[i];
3100
3101 if (bh->inreq) {
3102 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3103 bh->inreq = NULL;
3104 }
3105 if (bh->outreq) {
3106 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3107 bh->outreq = NULL;
3108 }
3109 }
3110 if (fsg->intreq) {
3111 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3112 fsg->intreq = NULL;
3113 }
3114
3115 /* Disable the endpoints */
3116 if (fsg->bulk_in_enabled) {
3117 usb_ep_disable(fsg->bulk_in);
3118 fsg->bulk_in_enabled = 0;
3119 }
3120 if (fsg->bulk_out_enabled) {
3121 usb_ep_disable(fsg->bulk_out);
3122 fsg->bulk_out_enabled = 0;
3123 }
3124 if (fsg->intr_in_enabled) {
3125 usb_ep_disable(fsg->intr_in);
3126 fsg->intr_in_enabled = 0;
3127 }
3128
3129 fsg->running = 0;
3130 if (altsetting < 0 || rc != 0)
3131 return rc;
3132
3133 DBG(fsg, "set interface %d\n", altsetting);
3134
3135 /* Enable the endpoints */
3136 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3137 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3138 goto reset;
3139 fsg->bulk_in_enabled = 1;
3140
3141 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3142 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3143 goto reset;
3144 fsg->bulk_out_enabled = 1;
3145 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3146
3147 if (transport_is_cbi()) {
3148 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3149 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3150 goto reset;
3151 fsg->intr_in_enabled = 1;
3152 }
3153
3154 /* Allocate the requests */
3155 for (i = 0; i < NUM_BUFFERS; ++i) {
3156 struct fsg_buffhd *bh = &fsg->buffhds[i];
3157
3158 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3159 goto reset;
3160 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3161 goto reset;
3162 bh->inreq->buf = bh->outreq->buf = bh->buf;
3163 bh->inreq->dma = bh->outreq->dma = bh->dma;
3164 bh->inreq->context = bh->outreq->context = bh;
3165 bh->inreq->complete = bulk_in_complete;
3166 bh->outreq->complete = bulk_out_complete;
3167 }
3168 if (transport_is_cbi()) {
3169 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3170 goto reset;
3171 fsg->intreq->complete = intr_in_complete;
3172 }
3173
3174 fsg->running = 1;
3175 for (i = 0; i < fsg->nluns; ++i)
3176 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3177 return rc;
3178}
3179
3180
3181/*
3182 * Change our operational configuration. This code must agree with the code
3183 * that returns config descriptors, and with interface altsetting code.
3184 *
3185 * It's also responsible for power management interactions. Some
3186 * configurations might not work with our current power sources.
3187 * For now we just assume the gadget is always self-powered.
3188 */
3189static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3190{
3191 int rc = 0;
3192
3193 /* Disable the single interface */
3194 if (fsg->config != 0) {
3195 DBG(fsg, "reset config\n");
3196 fsg->config = 0;
3197 rc = do_set_interface(fsg, -1);
3198 }
3199
3200 /* Enable the interface */
3201 if (new_config != 0) {
3202 fsg->config = new_config;
3203 if ((rc = do_set_interface(fsg, 0)) != 0)
3204 fsg->config = 0; // Reset on errors
3205 else {
3206 char *speed;
3207
3208 switch (fsg->gadget->speed) {
3209 case USB_SPEED_LOW: speed = "low"; break;
3210 case USB_SPEED_FULL: speed = "full"; break;
3211 case USB_SPEED_HIGH: speed = "high"; break;
3212 default: speed = "?"; break;
3213 }
3214 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3215 }
3216 }
3217 return rc;
3218}
3219
3220
3221/*-------------------------------------------------------------------------*/
3222
3223static void handle_exception(struct fsg_dev *fsg)
3224{
3225 siginfo_t info;
3226 int sig;
3227 int i;
3228 int num_active;
3229 struct fsg_buffhd *bh;
3230 enum fsg_state old_state;
3231 u8 new_config;
3232 struct lun *curlun;
3233 unsigned int exception_req_tag;
3234 int rc;
3235
3236 /* Clear the existing signals. Anything but SIGUSR1 is converted
3237 * into a high-priority EXIT exception. */
3238 for (;;) {
3239 sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
3240 &info);
3241 if (!sig)
3242 break;
3243 if (sig != SIGUSR1) {
3244 if (fsg->state < FSG_STATE_EXIT)
3245 DBG(fsg, "Main thread exiting on signal\n");
3246 raise_exception(fsg, FSG_STATE_EXIT);
3247 }
3248 }
3249
3250 /* Cancel all the pending transfers */
3251 if (fsg->intreq_busy)
3252 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3253 for (i = 0; i < NUM_BUFFERS; ++i) {
3254 bh = &fsg->buffhds[i];
3255 if (bh->inreq_busy)
3256 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3257 if (bh->outreq_busy)
3258 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3259 }
3260
3261 /* Wait until everything is idle */
3262 for (;;) {
3263 num_active = fsg->intreq_busy;
3264 for (i = 0; i < NUM_BUFFERS; ++i) {
3265 bh = &fsg->buffhds[i];
3266 num_active += bh->inreq_busy + bh->outreq_busy;
3267 }
3268 if (num_active == 0)
3269 break;
3270 if (sleep_thread(fsg))
3271 return;
3272 }
3273
3274 /* Clear out the controller's fifos */
3275 if (fsg->bulk_in_enabled)
3276 usb_ep_fifo_flush(fsg->bulk_in);
3277 if (fsg->bulk_out_enabled)
3278 usb_ep_fifo_flush(fsg->bulk_out);
3279 if (fsg->intr_in_enabled)
3280 usb_ep_fifo_flush(fsg->intr_in);
3281
3282 /* Reset the I/O buffer states and pointers, the SCSI
3283 * state, and the exception. Then invoke the handler. */
3284 spin_lock_irq(&fsg->lock);
3285
3286 for (i = 0; i < NUM_BUFFERS; ++i) {
3287 bh = &fsg->buffhds[i];
3288 bh->state = BUF_STATE_EMPTY;
3289 }
3290 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3291 &fsg->buffhds[0];
3292
3293 exception_req_tag = fsg->exception_req_tag;
3294 new_config = fsg->new_config;
3295 old_state = fsg->state;
3296
3297 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3298 fsg->state = FSG_STATE_STATUS_PHASE;
3299 else {
3300 for (i = 0; i < fsg->nluns; ++i) {
3301 curlun = &fsg->luns[i];
3302 curlun->prevent_medium_removal = 0;
3303 curlun->sense_data = curlun->unit_attention_data =
3304 SS_NO_SENSE;
3305 curlun->sense_data_info = 0;
3306 }
3307 fsg->state = FSG_STATE_IDLE;
3308 }
3309 spin_unlock_irq(&fsg->lock);
3310
3311 /* Carry out any extra actions required for the exception */
3312 switch (old_state) {
3313 default:
3314 break;
3315
3316 case FSG_STATE_ABORT_BULK_OUT:
3317 send_status(fsg);
3318 spin_lock_irq(&fsg->lock);
3319 if (fsg->state == FSG_STATE_STATUS_PHASE)
3320 fsg->state = FSG_STATE_IDLE;
3321 spin_unlock_irq(&fsg->lock);
3322 break;
3323
3324 case FSG_STATE_RESET:
3325 /* In case we were forced against our will to halt a
3326 * bulk endpoint, clear the halt now. (The SuperH UDC
3327 * requires this.) */
3328 if (test_and_clear_bit(CLEAR_BULK_HALTS,
3329 &fsg->atomic_bitflags)) {
3330 usb_ep_clear_halt(fsg->bulk_in);
3331 usb_ep_clear_halt(fsg->bulk_out);
3332 }
3333
3334 if (transport_is_bbb()) {
3335 if (fsg->ep0_req_tag == exception_req_tag)
3336 ep0_queue(fsg); // Complete the status stage
3337
3338 } else if (transport_is_cbi())
3339 send_status(fsg); // Status by interrupt pipe
3340
3341 /* Technically this should go here, but it would only be
3342 * a waste of time. Ditto for the INTERFACE_CHANGE and
3343 * CONFIG_CHANGE cases. */
3344 // for (i = 0; i < fsg->nluns; ++i)
3345 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3346 break;
3347
3348 case FSG_STATE_INTERFACE_CHANGE:
3349 rc = do_set_interface(fsg, 0);
3350 if (fsg->ep0_req_tag != exception_req_tag)
3351 break;
3352 if (rc != 0) // STALL on errors
3353 fsg_set_halt(fsg, fsg->ep0);
3354 else // Complete the status stage
3355 ep0_queue(fsg);
3356 break;
3357
3358 case FSG_STATE_CONFIG_CHANGE:
3359 rc = do_set_config(fsg, new_config);
3360 if (fsg->ep0_req_tag != exception_req_tag)
3361 break;
3362 if (rc != 0) // STALL on errors
3363 fsg_set_halt(fsg, fsg->ep0);
3364 else // Complete the status stage
3365 ep0_queue(fsg);
3366 break;
3367
3368 case FSG_STATE_DISCONNECT:
3369 fsync_all(fsg);
3370 do_set_config(fsg, 0); // Unconfigured state
3371 break;
3372
3373 case FSG_STATE_EXIT:
3374 case FSG_STATE_TERMINATED:
3375 do_set_config(fsg, 0); // Free resources
3376 spin_lock_irq(&fsg->lock);
3377 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3378 spin_unlock_irq(&fsg->lock);
3379 break;
3380 }
3381}
3382
3383
3384/*-------------------------------------------------------------------------*/
3385
3386static int fsg_main_thread(void *fsg_)
3387{
3388 struct fsg_dev *fsg = (struct fsg_dev *) fsg_;
3389
3390 fsg->thread_task = current;
3391
3392 /* Release all our userspace resources */
3393 daemonize("file-storage-gadget");
3394
3395 /* Allow the thread to be killed by a signal, but set the signal mask
3396 * to block everything but INT, TERM, KILL, and USR1. */
3397 siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
3398 sigmask(SIGTERM) | sigmask(SIGKILL) |
3399 sigmask(SIGUSR1));
3400 sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
3401
3402 /* Arrange for userspace references to be interpreted as kernel
3403 * pointers. That way we can pass a kernel pointer to a routine
3404 * that expects a __user pointer and it will work okay. */
3405 set_fs(get_ds());
3406
3407 /* Wait for the gadget registration to finish up */
3408 wait_for_completion(&fsg->thread_notifier);
3409
3410 /* The main loop */
3411 while (fsg->state != FSG_STATE_TERMINATED) {
3412 if (exception_in_progress(fsg) || signal_pending(current)) {
3413 handle_exception(fsg);
3414 continue;
3415 }
3416
3417 if (!fsg->running) {
3418 sleep_thread(fsg);
3419 continue;
3420 }
3421
3422 if (get_next_command(fsg))
3423 continue;
3424
3425 spin_lock_irq(&fsg->lock);
3426 if (!exception_in_progress(fsg))
3427 fsg->state = FSG_STATE_DATA_PHASE;
3428 spin_unlock_irq(&fsg->lock);
3429
3430 if (do_scsi_command(fsg) || finish_reply(fsg))
3431 continue;
3432
3433 spin_lock_irq(&fsg->lock);
3434 if (!exception_in_progress(fsg))
3435 fsg->state = FSG_STATE_STATUS_PHASE;
3436 spin_unlock_irq(&fsg->lock);
3437
3438 if (send_status(fsg))
3439 continue;
3440
3441 spin_lock_irq(&fsg->lock);
3442 if (!exception_in_progress(fsg))
3443 fsg->state = FSG_STATE_IDLE;
3444 spin_unlock_irq(&fsg->lock);
3445 }
3446
3447 fsg->thread_task = NULL;
3448 flush_signals(current);
3449
3450 /* In case we are exiting because of a signal, unregister the
3451 * gadget driver and close the backing file. */
3452 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3453 usb_gadget_unregister_driver(&fsg_driver);
3454 close_all_backing_files(fsg);
3455 }
3456
3457 /* Let the unbind and cleanup routines know the thread has exited */
3458 complete_and_exit(&fsg->thread_notifier, 0);
3459}
3460
3461
3462/*-------------------------------------------------------------------------*/
3463
3464/* If the next two routines are called while the gadget is registered,
3465 * the caller must own fsg->filesem for writing. */
3466
3467static int open_backing_file(struct lun *curlun, const char *filename)
3468{
3469 int ro;
3470 struct file *filp = NULL;
3471 int rc = -EINVAL;
3472 struct inode *inode = NULL;
3473 loff_t size;
3474 loff_t num_sectors;
3475
3476 /* R/W if we can, R/O if we must */
3477 ro = curlun->ro;
3478 if (!ro) {
3479 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3480 if (-EROFS == PTR_ERR(filp))
3481 ro = 1;
3482 }
3483 if (ro)
3484 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3485 if (IS_ERR(filp)) {
3486 LINFO(curlun, "unable to open backing file: %s\n", filename);
3487 return PTR_ERR(filp);
3488 }
3489
3490 if (!(filp->f_mode & FMODE_WRITE))
3491 ro = 1;
3492
3493 if (filp->f_dentry)
3494 inode = filp->f_dentry->d_inode;
3495 if (inode && S_ISBLK(inode->i_mode)) {
3496 if (bdev_read_only(inode->i_bdev))
3497 ro = 1;
3498 } else if (!inode || !S_ISREG(inode->i_mode)) {
3499 LINFO(curlun, "invalid file type: %s\n", filename);
3500 goto out;
3501 }
3502
3503 /* If we can't read the file, it's no good.
3504 * If we can't write the file, use it read-only. */
3505 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3506 LINFO(curlun, "file not readable: %s\n", filename);
3507 goto out;
3508 }
3509 if (!(filp->f_op->write || filp->f_op->aio_write))
3510 ro = 1;
3511
3512 size = i_size_read(inode->i_mapping->host);
3513 if (size < 0) {
3514 LINFO(curlun, "unable to find file size: %s\n", filename);
3515 rc = (int) size;
3516 goto out;
3517 }
3518 num_sectors = size >> 9; // File size in 512-byte sectors
3519 if (num_sectors == 0) {
3520 LINFO(curlun, "file too small: %s\n", filename);
3521 rc = -ETOOSMALL;
3522 goto out;
3523 }
3524
3525 get_file(filp);
3526 curlun->ro = ro;
3527 curlun->filp = filp;
3528 curlun->file_length = size;
3529 curlun->num_sectors = num_sectors;
3530 LDBG(curlun, "open backing file: %s\n", filename);
3531 rc = 0;
3532
3533out:
3534 filp_close(filp, current->files);
3535 return rc;
3536}
3537
3538
3539static void close_backing_file(struct lun *curlun)
3540{
3541 if (curlun->filp) {
3542 LDBG(curlun, "close backing file\n");
3543 fput(curlun->filp);
3544 curlun->filp = NULL;
3545 }
3546}
3547
3548static void close_all_backing_files(struct fsg_dev *fsg)
3549{
3550 int i;
3551
3552 for (i = 0; i < fsg->nluns; ++i)
3553 close_backing_file(&fsg->luns[i]);
3554}
3555
3556
3557static ssize_t show_ro(struct device *dev, char *buf)
3558{
3559 struct lun *curlun = dev_to_lun(dev);
3560
3561 return sprintf(buf, "%d\n", curlun->ro);
3562}
3563
3564static ssize_t show_file(struct device *dev, char *buf)
3565{
3566 struct lun *curlun = dev_to_lun(dev);
3567 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3568 char *p;
3569 ssize_t rc;
3570
3571 down_read(&fsg->filesem);
3572 if (backing_file_is_open(curlun)) { // Get the complete pathname
3573 p = d_path(curlun->filp->f_dentry, curlun->filp->f_vfsmnt,
3574 buf, PAGE_SIZE - 1);
3575 if (IS_ERR(p))
3576 rc = PTR_ERR(p);
3577 else {
3578 rc = strlen(p);
3579 memmove(buf, p, rc);
3580 buf[rc] = '\n'; // Add a newline
3581 buf[++rc] = 0;
3582 }
3583 } else { // No file, return 0 bytes
3584 *buf = 0;
3585 rc = 0;
3586 }
3587 up_read(&fsg->filesem);
3588 return rc;
3589}
3590
3591
3592static ssize_t store_ro(struct device *dev, const char *buf, size_t count)
3593{
3594 ssize_t rc = count;
3595 struct lun *curlun = dev_to_lun(dev);
3596 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3597 int i;
3598
3599 if (sscanf(buf, "%d", &i) != 1)
3600 return -EINVAL;
3601
3602 /* Allow the write-enable status to change only while the backing file
3603 * is closed. */
3604 down_read(&fsg->filesem);
3605 if (backing_file_is_open(curlun)) {
3606 LDBG(curlun, "read-only status change prevented\n");
3607 rc = -EBUSY;
3608 } else {
3609 curlun->ro = !!i;
3610 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3611 }
3612 up_read(&fsg->filesem);
3613 return rc;
3614}
3615
3616static ssize_t store_file(struct device *dev, const char *buf, size_t count)
3617{
3618 struct lun *curlun = dev_to_lun(dev);
3619 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3620 int rc = 0;
3621
3622 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3623 LDBG(curlun, "eject attempt prevented\n");
3624 return -EBUSY; // "Door is locked"
3625 }
3626
3627 /* Remove a trailing newline */
3628 if (count > 0 && buf[count-1] == '\n')
3629 ((char *) buf)[count-1] = 0; // Ugh!
3630
3631 /* Eject current medium */
3632 down_write(&fsg->filesem);
3633 if (backing_file_is_open(curlun)) {
3634 close_backing_file(curlun);
3635 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3636 }
3637
3638 /* Load new medium */
3639 if (count > 0 && buf[0]) {
3640 rc = open_backing_file(curlun, buf);
3641 if (rc == 0)
3642 curlun->unit_attention_data =
3643 SS_NOT_READY_TO_READY_TRANSITION;
3644 }
3645 up_write(&fsg->filesem);
3646 return (rc < 0 ? rc : count);
3647}
3648
3649
3650/* The write permissions and store_xxx pointers are set in fsg_bind() */
3651static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3652static DEVICE_ATTR(file, 0444, show_file, NULL);
3653
3654
3655/*-------------------------------------------------------------------------*/
3656
3657static void lun_release(struct device *dev)
3658{
3659 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3660
3661 complete(&fsg->lun_released);
3662}
3663
3664static void fsg_unbind(struct usb_gadget *gadget)
3665{
3666 struct fsg_dev *fsg = get_gadget_data(gadget);
3667 int i;
3668 struct lun *curlun;
3669 struct usb_request *req = fsg->ep0req;
3670
3671 DBG(fsg, "unbind\n");
3672 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3673
3674 /* Unregister the sysfs attribute files and the LUNs */
3675 init_completion(&fsg->lun_released);
3676 for (i = 0; i < fsg->nluns; ++i) {
3677 curlun = &fsg->luns[i];
3678 if (curlun->registered) {
3679 device_remove_file(&curlun->dev, &dev_attr_ro);
3680 device_remove_file(&curlun->dev, &dev_attr_file);
3681 device_unregister(&curlun->dev);
3682 wait_for_completion(&fsg->lun_released);
3683 curlun->registered = 0;
3684 }
3685 }
3686
3687 /* If the thread isn't already dead, tell it to exit now */
3688 if (fsg->state != FSG_STATE_TERMINATED) {
3689 raise_exception(fsg, FSG_STATE_EXIT);
3690 wait_for_completion(&fsg->thread_notifier);
3691
3692 /* The cleanup routine waits for this completion also */
3693 complete(&fsg->thread_notifier);
3694 }
3695
3696 /* Free the data buffers */
3697 for (i = 0; i < NUM_BUFFERS; ++i) {
3698 struct fsg_buffhd *bh = &fsg->buffhds[i];
3699
3700 if (bh->buf)
3701 usb_ep_free_buffer(fsg->bulk_in, bh->buf, bh->dma,
3702 mod_data.buflen);
3703 }
3704
3705 /* Free the request and buffer for endpoint 0 */
3706 if (req) {
3707 if (req->buf)
3708 usb_ep_free_buffer(fsg->ep0, req->buf,
3709 req->dma, EP0_BUFSIZE);
3710 usb_ep_free_request(fsg->ep0, req);
3711 }
3712
3713 set_gadget_data(gadget, NULL);
3714}
3715
3716
3717static int __init check_parameters(struct fsg_dev *fsg)
3718{
3719 int prot;
3720
3721 /* Store the default values */
3722 mod_data.transport_type = USB_PR_BULK;
3723 mod_data.transport_name = "Bulk-only";
3724 mod_data.protocol_type = USB_SC_SCSI;
3725 mod_data.protocol_name = "Transparent SCSI";
3726
3727 if (gadget_is_sh(fsg->gadget))
3728 mod_data.can_stall = 0;
3729
3730 if (mod_data.release == 0xffff) { // Parameter wasn't set
3731 if (gadget_is_net2280(fsg->gadget))
3732 mod_data.release = 0x0301;
3733 else if (gadget_is_dummy(fsg->gadget))
3734 mod_data.release = 0x0302;
3735 else if (gadget_is_pxa(fsg->gadget))
3736 mod_data.release = 0x0303;
3737 else if (gadget_is_sh(fsg->gadget))
3738 mod_data.release = 0x0304;
3739
3740 /* The sa1100 controller is not supported */
3741
3742 else if (gadget_is_goku(fsg->gadget))
3743 mod_data.release = 0x0306;
3744 else if (gadget_is_mq11xx(fsg->gadget))
3745 mod_data.release = 0x0307;
3746 else if (gadget_is_omap(fsg->gadget))
3747 mod_data.release = 0x0308;
3748 else if (gadget_is_lh7a40x(fsg->gadget))
3749 mod_data.release = 0x0309;
3750 else if (gadget_is_n9604(fsg->gadget))
3751 mod_data.release = 0x0310;
3752 else if (gadget_is_pxa27x(fsg->gadget))
3753 mod_data.release = 0x0311;
3754 else if (gadget_is_s3c2410(gadget))
3755 mod_data.release = 0x0312;
3756 else if (gadget_is_at91(fsg->gadget))
3757 mod_data.release = 0x0313;
3758 else {
3759 WARN(fsg, "controller '%s' not recognized\n",
3760 fsg->gadget->name);
3761 mod_data.release = 0x0399;
3762 }
3763 }
3764
3765 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3766
3767#ifdef CONFIG_USB_FILE_STORAGE_TEST
3768 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3769 ; // Use default setting
3770 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3771 mod_data.transport_type = USB_PR_CB;
3772 mod_data.transport_name = "Control-Bulk";
3773 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3774 mod_data.transport_type = USB_PR_CBI;
3775 mod_data.transport_name = "Control-Bulk-Interrupt";
3776 } else {
3777 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3778 return -EINVAL;
3779 }
3780
3781 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3782 prot == USB_SC_SCSI) {
3783 ; // Use default setting
3784 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3785 prot == USB_SC_RBC) {
3786 mod_data.protocol_type = USB_SC_RBC;
3787 mod_data.protocol_name = "RBC";
3788 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3789 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3790 prot == USB_SC_8020) {
3791 mod_data.protocol_type = USB_SC_8020;
3792 mod_data.protocol_name = "8020i (ATAPI)";
3793 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3794 prot == USB_SC_QIC) {
3795 mod_data.protocol_type = USB_SC_QIC;
3796 mod_data.protocol_name = "QIC-157";
3797 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3798 prot == USB_SC_UFI) {
3799 mod_data.protocol_type = USB_SC_UFI;
3800 mod_data.protocol_name = "UFI";
3801 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3802 prot == USB_SC_8070) {
3803 mod_data.protocol_type = USB_SC_8070;
3804 mod_data.protocol_name = "8070i";
3805 } else {
3806 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3807 return -EINVAL;
3808 }
3809
3810 mod_data.buflen &= PAGE_CACHE_MASK;
3811 if (mod_data.buflen <= 0) {
3812 ERROR(fsg, "invalid buflen\n");
3813 return -ETOOSMALL;
3814 }
3815#endif /* CONFIG_USB_FILE_STORAGE_TEST */
3816
3817 return 0;
3818}
3819
3820
3821static int __init fsg_bind(struct usb_gadget *gadget)
3822{
3823 struct fsg_dev *fsg = the_fsg;
3824 int rc;
3825 int i;
3826 struct lun *curlun;
3827 struct usb_ep *ep;
3828 struct usb_request *req;
3829 char *pathbuf, *p;
3830
3831 fsg->gadget = gadget;
3832 set_gadget_data(gadget, fsg);
3833 fsg->ep0 = gadget->ep0;
3834 fsg->ep0->driver_data = fsg;
3835
3836 if ((rc = check_parameters(fsg)) != 0)
3837 goto out;
3838
3839 if (mod_data.removable) { // Enable the store_xxx attributes
3840 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3841 dev_attr_ro.store = store_ro;
3842 dev_attr_file.store = store_file;
3843 }
3844
3845 /* Find out how many LUNs there should be */
3846 i = mod_data.nluns;
3847 if (i == 0)
3848 i = max(mod_data.num_filenames, 1);
3849 if (i > MAX_LUNS) {
3850 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3851 rc = -EINVAL;
3852 goto out;
3853 }
3854
3855 /* Create the LUNs, open their backing files, and register the
3856 * LUN devices in sysfs. */
3857 fsg->luns = kmalloc(i * sizeof(struct lun), GFP_KERNEL);
3858 if (!fsg->luns) {
3859 rc = -ENOMEM;
3860 goto out;
3861 }
3862 memset(fsg->luns, 0, i * sizeof(struct lun));
3863 fsg->nluns = i;
3864
3865 for (i = 0; i < fsg->nluns; ++i) {
3866 curlun = &fsg->luns[i];
3867 curlun->ro = ro[i];
3868 curlun->dev.parent = &gadget->dev;
3869 curlun->dev.driver = &fsg_driver.driver;
3870 dev_set_drvdata(&curlun->dev, fsg);
3871 snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3872 "%s-lun%d", gadget->dev.bus_id, i);
3873
3874 if ((rc = device_register(&curlun->dev)) != 0)
3875 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3876 else {
3877 curlun->registered = 1;
3878 curlun->dev.release = lun_release;
3879 device_create_file(&curlun->dev, &dev_attr_ro);
3880 device_create_file(&curlun->dev, &dev_attr_file);
3881 }
3882
3883 if (file[i] && *file[i]) {
3884 if ((rc = open_backing_file(curlun, file[i])) != 0)
3885 goto out;
3886 } else if (!mod_data.removable) {
3887 ERROR(fsg, "no file given for LUN%d\n", i);
3888 rc = -EINVAL;
3889 goto out;
3890 }
3891 }
3892
3893 /* Find all the endpoints we will use */
3894 usb_ep_autoconfig_reset(gadget);
3895 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3896 if (!ep)
3897 goto autoconf_fail;
3898 ep->driver_data = fsg; // claim the endpoint
3899 fsg->bulk_in = ep;
3900
3901 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3902 if (!ep)
3903 goto autoconf_fail;
3904 ep->driver_data = fsg; // claim the endpoint
3905 fsg->bulk_out = ep;
3906
3907 if (transport_is_cbi()) {
3908 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3909 if (!ep)
3910 goto autoconf_fail;
3911 ep->driver_data = fsg; // claim the endpoint
3912 fsg->intr_in = ep;
3913 }
3914
3915 /* Fix up the descriptors */
3916 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3917 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3918 device_desc.idProduct = cpu_to_le16(mod_data.product);
3919 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3920
3921 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3922 intf_desc.bNumEndpoints = i;
3923 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3924 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3925 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3926
3927#ifdef CONFIG_USB_GADGET_DUALSPEED
3928 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3929
3930 /* Assume ep0 uses the same maxpacket value for both speeds */
3931 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3932
3933 /* Assume that all endpoint addresses are the same for both speeds */
3934 hs_bulk_in_desc.bEndpointAddress = fs_bulk_in_desc.bEndpointAddress;
3935 hs_bulk_out_desc.bEndpointAddress = fs_bulk_out_desc.bEndpointAddress;
3936 hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
3937#endif
3938
3939 if (gadget->is_otg) {
3940 otg_desc.bmAttributes |= USB_OTG_HNP,
3941 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
3942 }
3943
3944 rc = -ENOMEM;
3945
3946 /* Allocate the request and buffer for endpoint 0 */
3947 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3948 if (!req)
3949 goto out;
3950 req->buf = usb_ep_alloc_buffer(fsg->ep0, EP0_BUFSIZE,
3951 &req->dma, GFP_KERNEL);
3952 if (!req->buf)
3953 goto out;
3954 req->complete = ep0_complete;
3955
3956 /* Allocate the data buffers */
3957 for (i = 0; i < NUM_BUFFERS; ++i) {
3958 struct fsg_buffhd *bh = &fsg->buffhds[i];
3959
3960 bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
3961 &bh->dma, GFP_KERNEL);
3962 if (!bh->buf)
3963 goto out;
3964 bh->next = bh + 1;
3965 }
3966 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3967
3968 /* This should reflect the actual gadget power source */
3969 usb_gadget_set_selfpowered(gadget);
3970
3971 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3972 system_utsname.sysname, system_utsname.release,
3973 gadget->name);
3974
3975 /* On a real device, serial[] would be loaded from permanent
3976 * storage. We just encode it from the driver version string. */
3977 for (i = 0; i < sizeof(serial) - 2; i += 2) {
3978 unsigned char c = DRIVER_VERSION[i / 2];
3979
3980 if (!c)
3981 break;
3982 sprintf(&serial[i], "%02X", c);
3983 }
3984
3985 if ((rc = kernel_thread(fsg_main_thread, fsg, (CLONE_VM | CLONE_FS |
3986 CLONE_FILES))) < 0)
3987 goto out;
3988 fsg->thread_pid = rc;
3989
3990 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
3991 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
3992
3993 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
3994 for (i = 0; i < fsg->nluns; ++i) {
3995 curlun = &fsg->luns[i];
3996 if (backing_file_is_open(curlun)) {
3997 p = NULL;
3998 if (pathbuf) {
3999 p = d_path(curlun->filp->f_dentry,
4000 curlun->filp->f_vfsmnt,
4001 pathbuf, PATH_MAX);
4002 if (IS_ERR(p))
4003 p = NULL;
4004 }
4005 LINFO(curlun, "ro=%d, file: %s\n",
4006 curlun->ro, (p ? p : "(error)"));
4007 }
4008 }
4009 kfree(pathbuf);
4010
4011 DBG(fsg, "transport=%s (x%02x)\n",
4012 mod_data.transport_name, mod_data.transport_type);
4013 DBG(fsg, "protocol=%s (x%02x)\n",
4014 mod_data.protocol_name, mod_data.protocol_type);
4015 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4016 mod_data.vendor, mod_data.product, mod_data.release);
4017 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
4018 mod_data.removable, mod_data.can_stall,
4019 mod_data.buflen);
4020 DBG(fsg, "I/O thread pid: %d\n", fsg->thread_pid);
4021 return 0;
4022
4023autoconf_fail:
4024 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4025 rc = -ENOTSUPP;
4026
4027out:
4028 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4029 fsg_unbind(gadget);
4030 close_all_backing_files(fsg);
4031 return rc;
4032}
4033
4034
4035/*-------------------------------------------------------------------------*/
4036
4037static void fsg_suspend(struct usb_gadget *gadget)
4038{
4039 struct fsg_dev *fsg = get_gadget_data(gadget);
4040
4041 DBG(fsg, "suspend\n");
4042 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4043}
4044
4045static void fsg_resume(struct usb_gadget *gadget)
4046{
4047 struct fsg_dev *fsg = get_gadget_data(gadget);
4048
4049 DBG(fsg, "resume\n");
4050 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4051}
4052
4053
4054/*-------------------------------------------------------------------------*/
4055
4056static struct usb_gadget_driver fsg_driver = {
4057#ifdef CONFIG_USB_GADGET_DUALSPEED
4058 .speed = USB_SPEED_HIGH,
4059#else
4060 .speed = USB_SPEED_FULL,
4061#endif
4062 .function = (char *) longname,
4063 .bind = fsg_bind,
4064 .unbind = fsg_unbind,
4065 .disconnect = fsg_disconnect,
4066 .setup = fsg_setup,
4067 .suspend = fsg_suspend,
4068 .resume = fsg_resume,
4069
4070 .driver = {
4071 .name = (char *) shortname,
4072 // .release = ...
4073 // .suspend = ...
4074 // .resume = ...
4075 },
4076};
4077
4078
4079static int __init fsg_alloc(void)
4080{
4081 struct fsg_dev *fsg;
4082
4083 fsg = kmalloc(sizeof *fsg, GFP_KERNEL);
4084 if (!fsg)
4085 return -ENOMEM;
4086 memset(fsg, 0, sizeof *fsg);
4087 spin_lock_init(&fsg->lock);
4088 init_rwsem(&fsg->filesem);
4089 init_waitqueue_head(&fsg->thread_wqh);
4090 init_completion(&fsg->thread_notifier);
4091
4092 the_fsg = fsg;
4093 return 0;
4094}
4095
4096
4097static void fsg_free(struct fsg_dev *fsg)
4098{
4099 kfree(fsg->luns);
4100 kfree(fsg);
4101}
4102
4103
4104static int __init fsg_init(void)
4105{
4106 int rc;
4107 struct fsg_dev *fsg;
4108
4109 if ((rc = fsg_alloc()) != 0)
4110 return rc;
4111 fsg = the_fsg;
4112 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) {
4113 fsg_free(fsg);
4114 return rc;
4115 }
4116 set_bit(REGISTERED, &fsg->atomic_bitflags);
4117
4118 /* Tell the thread to start working */
4119 complete(&fsg->thread_notifier);
4120 return 0;
4121}
4122module_init(fsg_init);
4123
4124
4125static void __exit fsg_cleanup(void)
4126{
4127 struct fsg_dev *fsg = the_fsg;
4128
4129 /* Unregister the driver iff the thread hasn't already done so */
4130 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4131 usb_gadget_unregister_driver(&fsg_driver);
4132
4133 /* Wait for the thread to finish up */
4134 wait_for_completion(&fsg->thread_notifier);
4135
4136 close_all_backing_files(fsg);
4137 fsg_free(fsg);
4138}
4139module_exit(fsg_cleanup);
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-03 18:39:05 -0500