2 * file_storage.c -- File-backed USB Storage Gadget, for USB development
4 * Copyright (C) 2003-2007 Alan Stern
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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.
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.
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.
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.
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.
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.
74 * Note that the driver is slightly non-portable in that it assumes a
75 * single memory/DMA buffer will be useable for bulk-in, bulk-out, and
76 * interrupt-in endpoints. With most device controllers this isn't an
77 * issue, but there may be some with hardware restrictions that prevent
78 * a buffer from being used by more than one endpoint.
82 * file=filename[,filename...]
83 * Required if "removable" is not set, names of
84 * the files or block devices used for
86 * ro=b[,b...] Default false, booleans for read-only access
87 * removable Default false, boolean for removable media
88 * luns=N Default N = number of filenames, number of
90 * stall Default determined according to the type of
91 * USB device controller (usually true),
92 * boolean to permit the driver to halt
94 * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
95 * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
96 * ATAPI, QIC, UFI, 8070, or SCSI;
98 * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
99 * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
100 * release=0xRRRR Override the USB release number (bcdDevice)
101 * buflen=N Default N=16384, buffer size used (will be
102 * rounded down to a multiple of
105 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
106 * "removable", "luns", and "stall" options are available; default values
107 * are used for everything else.
109 * The pathnames of the backing files and the ro settings are available in
110 * the attribute files "file" and "ro" in the lun<n> subdirectory of the
111 * gadget's sysfs directory. If the "removable" option is set, writing to
112 * these files will simulate ejecting/loading the medium (writing an empty
113 * line means eject) and adjusting a write-enable tab. Changes to the ro
114 * setting are not allowed when the medium is loaded.
116 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
117 * The driver's SCSI command interface was based on the "Information
118 * technology - Small Computer System Interface - 2" document from
119 * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
120 * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception
121 * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
122 * "Universal Serial Bus Mass Storage Class UFI Command Specification"
123 * document, Revision 1.0, December 14, 1998, available at
124 * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
131 * The FSG driver is fairly straightforward. There is a main kernel
132 * thread that handles most of the work. Interrupt routines field
133 * callbacks from the controller driver: bulk- and interrupt-request
134 * completion notifications, endpoint-0 events, and disconnect events.
135 * Completion events are passed to the main thread by wakeup calls. Many
136 * ep0 requests are handled at interrupt time, but SetInterface,
137 * SetConfiguration, and device reset requests are forwarded to the
138 * thread in the form of "exceptions" using SIGUSR1 signals (since they
139 * should interrupt any ongoing file I/O operations).
141 * The thread's main routine implements the standard command/data/status
142 * parts of a SCSI interaction. It and its subroutines are full of tests
143 * for pending signals/exceptions -- all this polling is necessary since
144 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
145 * indication that the driver really wants to be running in userspace.)
146 * An important point is that so long as the thread is alive it keeps an
147 * open reference to the backing file. This will prevent unmounting
148 * the backing file's underlying filesystem and could cause problems
149 * during system shutdown, for example. To prevent such problems, the
150 * thread catches INT, TERM, and KILL signals and converts them into
153 * In normal operation the main thread is started during the gadget's
154 * fsg_bind() callback and stopped during fsg_unbind(). But it can also
155 * exit when it receives a signal, and there's no point leaving the
156 * gadget running when the thread is dead. So just before the thread
157 * exits, it deregisters the gadget driver. This makes things a little
158 * tricky: The driver is deregistered at two places, and the exiting
159 * thread can indirectly call fsg_unbind() which in turn can tell the
160 * thread to exit. The first problem is resolved through the use of the
161 * REGISTERED atomic bitflag; the driver will only be deregistered once.
162 * The second problem is resolved by having fsg_unbind() check
163 * fsg->state; it won't try to stop the thread if the state is already
164 * FSG_STATE_TERMINATED.
166 * To provide maximum throughput, the driver uses a circular pipeline of
167 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
168 * arbitrarily long; in practice the benefits don't justify having more
169 * than 2 stages (i.e., double buffering). But it helps to think of the
170 * pipeline as being a long one. Each buffer head contains a bulk-in and
171 * a bulk-out request pointer (since the buffer can be used for both
172 * output and input -- directions always are given from the host's
173 * point of view) as well as a pointer to the buffer and various state
176 * Use of the pipeline follows a simple protocol. There is a variable
177 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
178 * At any time that buffer head may still be in use from an earlier
179 * request, so each buffer head has a state variable indicating whether
180 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
181 * buffer head to be EMPTY, filling the buffer either by file I/O or by
182 * USB I/O (during which the buffer head is BUSY), and marking the buffer
183 * head FULL when the I/O is complete. Then the buffer will be emptied
184 * (again possibly by USB I/O, during which it is marked BUSY) and
185 * finally marked EMPTY again (possibly by a completion routine).
187 * A module parameter tells the driver to avoid stalling the bulk
188 * endpoints wherever the transport specification allows. This is
189 * necessary for some UDCs like the SuperH, which cannot reliably clear a
190 * halt on a bulk endpoint. However, under certain circumstances the
191 * Bulk-only specification requires a stall. In such cases the driver
192 * will halt the endpoint and set a flag indicating that it should clear
193 * the halt in software during the next device reset. Hopefully this
194 * will permit everything to work correctly. Furthermore, although the
195 * specification allows the bulk-out endpoint to halt when the host sends
196 * too much data, implementing this would cause an unavoidable race.
197 * The driver will always use the "no-stall" approach for OUT transfers.
199 * One subtle point concerns sending status-stage responses for ep0
200 * requests. Some of these requests, such as device reset, can involve
201 * interrupting an ongoing file I/O operation, which might take an
202 * arbitrarily long time. During that delay the host might give up on
203 * the original ep0 request and issue a new one. When that happens the
204 * driver should not notify the host about completion of the original
205 * request, as the host will no longer be waiting for it. So the driver
206 * assigns to each ep0 request a unique tag, and it keeps track of the
207 * tag value of the request associated with a long-running exception
208 * (device-reset, interface-change, or configuration-change). When the
209 * exception handler is finished, the status-stage response is submitted
210 * only if the current ep0 request tag is equal to the exception request
211 * tag. Thus only the most recently received ep0 request will get a
212 * status-stage response.
214 * Warning: This driver source file is too long. It ought to be split up
215 * into a header file plus about 3 separate .c files, to handle the details
216 * of the Gadget, USB Mass Storage, and SCSI protocols.
220 /* #define VERBOSE_DEBUG */
221 /* #define DUMP_MSGS */
224 #include <linux/blkdev.h>
225 #include <linux/completion.h>
226 #include <linux/dcache.h>
227 #include <linux/delay.h>
228 #include <linux/device.h>
229 #include <linux/fcntl.h>
230 #include <linux/file.h>
231 #include <linux/fs.h>
232 #include <linux/kref.h>
233 #include <linux/kthread.h>
234 #include <linux/limits.h>
235 #include <linux/rwsem.h>
236 #include <linux/slab.h>
237 #include <linux/spinlock.h>
238 #include <linux/string.h>
239 #include <linux/freezer.h>
240 #include <linux/utsname.h>
242 #include <linux/usb/ch9.h>
243 #include <linux/usb/gadget.h>
245 #include "gadget_chips.h"
250 * Kbuild is not very cooperative with respect to linking separately
251 * compiled library objects into one module. So for now we won't use
252 * separate compilation ... ensuring init/exit sections work to shrink
253 * the runtime footprint, and giving us at least some parts of what
254 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
256 #include "usbstring.c"
258 #include "epautoconf.c"
260 /*-------------------------------------------------------------------------*/
262 #define DRIVER_DESC "File-backed Storage Gadget"
263 #define DRIVER_NAME "g_file_storage"
264 #define DRIVER_VERSION "7 August 2007"
266 static const char longname[] = DRIVER_DESC;
267 static const char shortname[] = DRIVER_NAME;
269 MODULE_DESCRIPTION(DRIVER_DESC);
270 MODULE_AUTHOR("Alan Stern");
271 MODULE_LICENSE("Dual BSD/GPL");
273 /* Thanks to NetChip Technologies for donating this product ID.
275 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
276 * Instead: allocate your own, using normal USB-IF procedures. */
277 #define DRIVER_VENDOR_ID 0x0525 // NetChip
278 #define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
282 * This driver assumes self-powered hardware and has no way for users to
283 * trigger remote wakeup. It uses autoconfiguration to select endpoints
284 * and endpoint addresses.
288 /*-------------------------------------------------------------------------*/
290 #define LDBG(lun,fmt,args...) \
291 dev_dbg(&(lun)->dev , fmt , ## args)
292 #define MDBG(fmt,args...) \
293 pr_debug(DRIVER_NAME ": " fmt , ## args)
303 #define VLDBG(lun,fmt,args...) \
305 #endif /* VERBOSE_DEBUG */
307 #define LERROR(lun,fmt,args...) \
308 dev_err(&(lun)->dev , fmt , ## args)
309 #define LWARN(lun,fmt,args...) \
310 dev_warn(&(lun)->dev , fmt , ## args)
311 #define LINFO(lun,fmt,args...) \
312 dev_info(&(lun)->dev , fmt , ## args)
314 #define MINFO(fmt,args...) \
315 pr_info(DRIVER_NAME ": " fmt , ## args)
317 #define DBG(d, fmt, args...) \
318 dev_dbg(&(d)->gadget->dev , fmt , ## args)
319 #define VDBG(d, fmt, args...) \
320 dev_vdbg(&(d)->gadget->dev , fmt , ## args)
321 #define ERROR(d, fmt, args...) \
322 dev_err(&(d)->gadget->dev , fmt , ## args)
323 #define WARNING(d, fmt, args...) \
324 dev_warn(&(d)->gadget->dev , fmt , ## args)
325 #define INFO(d, fmt, args...) \
326 dev_info(&(d)->gadget->dev , fmt , ## args)
329 /*-------------------------------------------------------------------------*/
331 /* Encapsulate the module parameter settings */
336 char *file[MAX_LUNS];
338 unsigned int num_filenames;
339 unsigned int num_ros;
345 char *transport_parm;
347 unsigned short vendor;
348 unsigned short product;
349 unsigned short release;
353 char *transport_name;
357 } mod_data = { // Default values
358 .transport_parm = "BBB",
359 .protocol_parm = "SCSI",
362 .vendor = DRIVER_VENDOR_ID,
363 .product = DRIVER_PRODUCT_ID,
364 .release = 0xffff, // Use controller chip type
369 module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
371 MODULE_PARM_DESC(file, "names of backing files or devices");
373 module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
374 MODULE_PARM_DESC(ro, "true to force read-only");
376 module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
377 MODULE_PARM_DESC(luns, "number of LUNs");
379 module_param_named(removable, mod_data.removable, bool, S_IRUGO);
380 MODULE_PARM_DESC(removable, "true to simulate removable media");
382 module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
383 MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
386 /* In the non-TEST version, only the module parameters listed above
388 #ifdef CONFIG_USB_FILE_STORAGE_TEST
390 module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
391 MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
393 module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
394 MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
397 module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
398 MODULE_PARM_DESC(vendor, "USB Vendor ID");
400 module_param_named(product, mod_data.product, ushort, S_IRUGO);
401 MODULE_PARM_DESC(product, "USB Product ID");
403 module_param_named(release, mod_data.release, ushort, S_IRUGO);
404 MODULE_PARM_DESC(release, "USB release number");
406 module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
407 MODULE_PARM_DESC(buflen, "I/O buffer size");
409 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
412 /*-------------------------------------------------------------------------*/
414 /* USB protocol value = the transport method */
415 #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
416 #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
417 #define USB_PR_BULK 0x50 // Bulk-only
419 /* USB subclass value = the protocol encapsulation */
420 #define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
421 #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
422 #define USB_SC_QIC 0x03 // QIC-157 (tape)
423 #define USB_SC_UFI 0x04 // UFI (floppy)
424 #define USB_SC_8070 0x05 // SFF-8070i (removable)
425 #define USB_SC_SCSI 0x06 // Transparent SCSI
427 /* Bulk-only data structures */
429 /* Command Block Wrapper */
430 struct bulk_cb_wrap {
431 __le32 Signature; // Contains 'USBC'
432 u32 Tag; // Unique per command id
433 __le32 DataTransferLength; // Size of the data
434 u8 Flags; // Direction in bit 7
435 u8 Lun; // LUN (normally 0)
436 u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
437 u8 CDB[16]; // Command Data Block
440 #define USB_BULK_CB_WRAP_LEN 31
441 #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
442 #define USB_BULK_IN_FLAG 0x80
444 /* Command Status Wrapper */
445 struct bulk_cs_wrap {
446 __le32 Signature; // Should = 'USBS'
447 u32 Tag; // Same as original command
448 __le32 Residue; // Amount not transferred
449 u8 Status; // See below
452 #define USB_BULK_CS_WRAP_LEN 13
453 #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
454 #define USB_STATUS_PASS 0
455 #define USB_STATUS_FAIL 1
456 #define USB_STATUS_PHASE_ERROR 2
458 /* Bulk-only class specific requests */
459 #define USB_BULK_RESET_REQUEST 0xff
460 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
463 /* CBI Interrupt data structure */
464 struct interrupt_data {
469 #define CBI_INTERRUPT_DATA_LEN 2
471 /* CBI Accept Device-Specific Command request */
472 #define USB_CBI_ADSC_REQUEST 0x00
475 #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
477 /* SCSI commands that we recognize */
478 #define SC_FORMAT_UNIT 0x04
479 #define SC_INQUIRY 0x12
480 #define SC_MODE_SELECT_6 0x15
481 #define SC_MODE_SELECT_10 0x55
482 #define SC_MODE_SENSE_6 0x1a
483 #define SC_MODE_SENSE_10 0x5a
484 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
485 #define SC_READ_6 0x08
486 #define SC_READ_10 0x28
487 #define SC_READ_12 0xa8
488 #define SC_READ_CAPACITY 0x25
489 #define SC_READ_FORMAT_CAPACITIES 0x23
490 #define SC_RELEASE 0x17
491 #define SC_REQUEST_SENSE 0x03
492 #define SC_RESERVE 0x16
493 #define SC_SEND_DIAGNOSTIC 0x1d
494 #define SC_START_STOP_UNIT 0x1b
495 #define SC_SYNCHRONIZE_CACHE 0x35
496 #define SC_TEST_UNIT_READY 0x00
497 #define SC_VERIFY 0x2f
498 #define SC_WRITE_6 0x0a
499 #define SC_WRITE_10 0x2a
500 #define SC_WRITE_12 0xaa
502 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
503 #define SS_NO_SENSE 0
504 #define SS_COMMUNICATION_FAILURE 0x040800
505 #define SS_INVALID_COMMAND 0x052000
506 #define SS_INVALID_FIELD_IN_CDB 0x052400
507 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
508 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
509 #define SS_MEDIUM_NOT_PRESENT 0x023a00
510 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
511 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
512 #define SS_RESET_OCCURRED 0x062900
513 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
514 #define SS_UNRECOVERED_READ_ERROR 0x031100
515 #define SS_WRITE_ERROR 0x030c02
516 #define SS_WRITE_PROTECTED 0x072700
518 #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
519 #define ASC(x) ((u8) ((x) >> 8))
520 #define ASCQ(x) ((u8) (x))
523 /*-------------------------------------------------------------------------*/
526 * These definitions will permit the compiler to avoid generating code for
527 * parts of the driver that aren't used in the non-TEST version. Even gcc
528 * can recognize when a test of a constant expression yields a dead code
532 #ifdef CONFIG_USB_FILE_STORAGE_TEST
534 #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
535 #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
536 #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
540 #define transport_is_bbb() 1
541 #define transport_is_cbi() 0
542 #define protocol_is_scsi() 1
544 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
553 unsigned int prevent_medium_removal : 1;
554 unsigned int registered : 1;
555 unsigned int info_valid : 1;
559 u32 unit_attention_data;
564 #define backing_file_is_open(curlun) ((curlun)->filp != NULL)
566 static struct lun *dev_to_lun(struct device *dev)
568 return container_of(dev, struct lun, dev);
572 /* Big enough to hold our biggest descriptor */
573 #define EP0_BUFSIZE 256
574 #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
576 /* Number of buffers we will use. 2 is enough for double-buffering */
577 #define NUM_BUFFERS 2
579 enum fsg_buffer_state {
587 enum fsg_buffer_state state;
588 struct fsg_buffhd *next;
590 /* The NetChip 2280 is faster, and handles some protocol faults
591 * better, if we don't submit any short bulk-out read requests.
592 * So we will record the intended request length here. */
593 unsigned int bulk_out_intended_length;
595 struct usb_request *inreq;
597 struct usb_request *outreq;
602 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
603 FSG_STATE_DATA_PHASE,
604 FSG_STATE_STATUS_PHASE,
607 FSG_STATE_ABORT_BULK_OUT,
609 FSG_STATE_INTERFACE_CHANGE,
610 FSG_STATE_CONFIG_CHANGE,
611 FSG_STATE_DISCONNECT,
616 enum data_direction {
617 DATA_DIR_UNKNOWN = 0,
624 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
626 struct usb_gadget *gadget;
628 /* filesem protects: backing files in use */
629 struct rw_semaphore filesem;
631 /* reference counting: wait until all LUNs are released */
634 struct usb_ep *ep0; // Handy copy of gadget->ep0
635 struct usb_request *ep0req; // For control responses
636 unsigned int ep0_req_tag;
637 const char *ep0req_name;
639 struct usb_request *intreq; // For interrupt responses
641 struct fsg_buffhd *intr_buffhd;
643 unsigned int bulk_out_maxpacket;
644 enum fsg_state state; // For exception handling
645 unsigned int exception_req_tag;
647 u8 config, new_config;
649 unsigned int running : 1;
650 unsigned int bulk_in_enabled : 1;
651 unsigned int bulk_out_enabled : 1;
652 unsigned int intr_in_enabled : 1;
653 unsigned int phase_error : 1;
654 unsigned int short_packet_received : 1;
655 unsigned int bad_lun_okay : 1;
657 unsigned long atomic_bitflags;
659 #define IGNORE_BULK_OUT 1
662 struct usb_ep *bulk_in;
663 struct usb_ep *bulk_out;
664 struct usb_ep *intr_in;
666 struct fsg_buffhd *next_buffhd_to_fill;
667 struct fsg_buffhd *next_buffhd_to_drain;
668 struct fsg_buffhd buffhds[NUM_BUFFERS];
670 int thread_wakeup_needed;
671 struct completion thread_notifier;
672 struct task_struct *thread_task;
675 u8 cmnd[MAX_COMMAND_SIZE];
676 enum data_direction data_dir;
678 u32 data_size_from_cmnd;
684 /* The CB protocol offers no way for a host to know when a command
685 * has completed. As a result the next command may arrive early,
686 * and we will still have to handle it. For that reason we need
687 * a buffer to store new commands when using CB (or CBI, which
688 * does not oblige a host to wait for command completion either). */
690 u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
697 typedef void (*fsg_routine_t)(struct fsg_dev *);
699 static int exception_in_progress(struct fsg_dev *fsg)
701 return (fsg->state > FSG_STATE_IDLE);
704 /* Make bulk-out requests be divisible by the maxpacket size */
705 static void set_bulk_out_req_length(struct fsg_dev *fsg,
706 struct fsg_buffhd *bh, unsigned int length)
710 bh->bulk_out_intended_length = length;
711 rem = length % fsg->bulk_out_maxpacket;
713 length += fsg->bulk_out_maxpacket - rem;
714 bh->outreq->length = length;
717 static struct fsg_dev *the_fsg;
718 static struct usb_gadget_driver fsg_driver;
720 static void close_backing_file(struct lun *curlun);
721 static void close_all_backing_files(struct fsg_dev *fsg);
724 /*-------------------------------------------------------------------------*/
728 static void dump_msg(struct fsg_dev *fsg, const char *label,
729 const u8 *buf, unsigned int length)
732 DBG(fsg, "%s, length %u:\n", label, length);
733 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
734 16, 1, buf, length, 0);
738 static void dump_cdb(struct fsg_dev *fsg)
743 static void dump_msg(struct fsg_dev *fsg, const char *label,
744 const u8 *buf, unsigned int length)
749 static void dump_cdb(struct fsg_dev *fsg)
751 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,
752 16, 1, fsg->cmnd, fsg->cmnd_size, 0);
757 static void dump_cdb(struct fsg_dev *fsg)
760 #endif /* VERBOSE_DEBUG */
761 #endif /* DUMP_MSGS */
764 static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
768 if (ep == fsg->bulk_in)
770 else if (ep == fsg->bulk_out)
774 DBG(fsg, "%s set halt\n", name);
775 return usb_ep_set_halt(ep);
779 /*-------------------------------------------------------------------------*/
781 /* Routines for unaligned data access */
783 static u16 get_be16(u8 *buf)
785 return ((u16) buf[0] << 8) | ((u16) buf[1]);
788 static u32 get_be32(u8 *buf)
790 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
791 ((u32) buf[2] << 8) | ((u32) buf[3]);
794 static void put_be16(u8 *buf, u16 val)
800 static void put_be32(u8 *buf, u32 val)
809 /*-------------------------------------------------------------------------*/
812 * DESCRIPTORS ... most are static, but strings and (full) configuration
813 * descriptors are built on demand. Also the (static) config and interface
814 * descriptors are adjusted during fsg_bind().
816 #define STRING_MANUFACTURER 1
817 #define STRING_PRODUCT 2
818 #define STRING_SERIAL 3
819 #define STRING_CONFIG 4
820 #define STRING_INTERFACE 5
822 /* There is only one configuration. */
823 #define CONFIG_VALUE 1
825 static struct usb_device_descriptor
827 .bLength = sizeof device_desc,
828 .bDescriptorType = USB_DT_DEVICE,
830 .bcdUSB = __constant_cpu_to_le16(0x0200),
831 .bDeviceClass = USB_CLASS_PER_INTERFACE,
833 /* The next three values can be overridden by module parameters */
834 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
835 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
836 .bcdDevice = __constant_cpu_to_le16(0xffff),
838 .iManufacturer = STRING_MANUFACTURER,
839 .iProduct = STRING_PRODUCT,
840 .iSerialNumber = STRING_SERIAL,
841 .bNumConfigurations = 1,
844 static struct usb_config_descriptor
846 .bLength = sizeof config_desc,
847 .bDescriptorType = USB_DT_CONFIG,
849 /* wTotalLength computed by usb_gadget_config_buf() */
851 .bConfigurationValue = CONFIG_VALUE,
852 .iConfiguration = STRING_CONFIG,
853 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
854 .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
857 static struct usb_otg_descriptor
859 .bLength = sizeof(otg_desc),
860 .bDescriptorType = USB_DT_OTG,
862 .bmAttributes = USB_OTG_SRP,
865 /* There is only one interface. */
867 static struct usb_interface_descriptor
869 .bLength = sizeof intf_desc,
870 .bDescriptorType = USB_DT_INTERFACE,
872 .bNumEndpoints = 2, // Adjusted during fsg_bind()
873 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
874 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
875 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
876 .iInterface = STRING_INTERFACE,
879 /* Three full-speed endpoint descriptors: bulk-in, bulk-out,
880 * and interrupt-in. */
882 static struct usb_endpoint_descriptor
884 .bLength = USB_DT_ENDPOINT_SIZE,
885 .bDescriptorType = USB_DT_ENDPOINT,
887 .bEndpointAddress = USB_DIR_IN,
888 .bmAttributes = USB_ENDPOINT_XFER_BULK,
889 /* wMaxPacketSize set by autoconfiguration */
892 static struct usb_endpoint_descriptor
894 .bLength = USB_DT_ENDPOINT_SIZE,
895 .bDescriptorType = USB_DT_ENDPOINT,
897 .bEndpointAddress = USB_DIR_OUT,
898 .bmAttributes = USB_ENDPOINT_XFER_BULK,
899 /* wMaxPacketSize set by autoconfiguration */
902 static struct usb_endpoint_descriptor
904 .bLength = USB_DT_ENDPOINT_SIZE,
905 .bDescriptorType = USB_DT_ENDPOINT,
907 .bEndpointAddress = USB_DIR_IN,
908 .bmAttributes = USB_ENDPOINT_XFER_INT,
909 .wMaxPacketSize = __constant_cpu_to_le16(2),
910 .bInterval = 32, // frames -> 32 ms
913 static const struct usb_descriptor_header *fs_function[] = {
914 (struct usb_descriptor_header *) &otg_desc,
915 (struct usb_descriptor_header *) &intf_desc,
916 (struct usb_descriptor_header *) &fs_bulk_in_desc,
917 (struct usb_descriptor_header *) &fs_bulk_out_desc,
918 (struct usb_descriptor_header *) &fs_intr_in_desc,
921 #define FS_FUNCTION_PRE_EP_ENTRIES 2
925 * USB 2.0 devices need to expose both high speed and full speed
926 * descriptors, unless they only run at full speed.
928 * That means alternate endpoint descriptors (bigger packets)
929 * and a "device qualifier" ... plus more construction options
930 * for the config descriptor.
932 static struct usb_qualifier_descriptor
934 .bLength = sizeof dev_qualifier,
935 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
937 .bcdUSB = __constant_cpu_to_le16(0x0200),
938 .bDeviceClass = USB_CLASS_PER_INTERFACE,
940 .bNumConfigurations = 1,
943 static struct usb_endpoint_descriptor
945 .bLength = USB_DT_ENDPOINT_SIZE,
946 .bDescriptorType = USB_DT_ENDPOINT,
948 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
949 .bmAttributes = USB_ENDPOINT_XFER_BULK,
950 .wMaxPacketSize = __constant_cpu_to_le16(512),
953 static struct usb_endpoint_descriptor
955 .bLength = USB_DT_ENDPOINT_SIZE,
956 .bDescriptorType = USB_DT_ENDPOINT,
958 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
959 .bmAttributes = USB_ENDPOINT_XFER_BULK,
960 .wMaxPacketSize = __constant_cpu_to_le16(512),
961 .bInterval = 1, // NAK every 1 uframe
964 static struct usb_endpoint_descriptor
966 .bLength = USB_DT_ENDPOINT_SIZE,
967 .bDescriptorType = USB_DT_ENDPOINT,
969 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
970 .bmAttributes = USB_ENDPOINT_XFER_INT,
971 .wMaxPacketSize = __constant_cpu_to_le16(2),
972 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
975 static const struct usb_descriptor_header *hs_function[] = {
976 (struct usb_descriptor_header *) &otg_desc,
977 (struct usb_descriptor_header *) &intf_desc,
978 (struct usb_descriptor_header *) &hs_bulk_in_desc,
979 (struct usb_descriptor_header *) &hs_bulk_out_desc,
980 (struct usb_descriptor_header *) &hs_intr_in_desc,
983 #define HS_FUNCTION_PRE_EP_ENTRIES 2
985 /* Maxpacket and other transfer characteristics vary by speed. */
986 static struct usb_endpoint_descriptor *
987 ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
988 struct usb_endpoint_descriptor *hs)
990 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
996 /* The CBI specification limits the serial string to 12 uppercase hexadecimal
998 static char manufacturer[64];
999 static char serial[13];
1001 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1002 static struct usb_string strings[] = {
1003 {STRING_MANUFACTURER, manufacturer},
1004 {STRING_PRODUCT, longname},
1005 {STRING_SERIAL, serial},
1006 {STRING_CONFIG, "Self-powered"},
1007 {STRING_INTERFACE, "Mass Storage"},
1011 static struct usb_gadget_strings stringtab = {
1012 .language = 0x0409, // en-us
1018 * Config descriptors must agree with the code that sets configurations
1019 * and with code managing interfaces and their altsettings. They must
1020 * also handle different speeds and other-speed requests.
1022 static int populate_config_buf(struct usb_gadget *gadget,
1023 u8 *buf, u8 type, unsigned index)
1025 enum usb_device_speed speed = gadget->speed;
1027 const struct usb_descriptor_header **function;
1032 if (gadget_is_dualspeed(gadget) && type == USB_DT_OTHER_SPEED_CONFIG)
1033 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1034 if (gadget_is_dualspeed(gadget) && speed == USB_SPEED_HIGH)
1035 function = hs_function;
1037 function = fs_function;
1039 /* for now, don't advertise srp-only devices */
1040 if (!gadget_is_otg(gadget))
1043 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1044 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1049 /*-------------------------------------------------------------------------*/
1051 /* These routines may be called in process context or in_irq */
1053 /* Caller must hold fsg->lock */
1054 static void wakeup_thread(struct fsg_dev *fsg)
1056 /* Tell the main thread that something has happened */
1057 fsg->thread_wakeup_needed = 1;
1058 if (fsg->thread_task)
1059 wake_up_process(fsg->thread_task);
1063 static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1065 unsigned long flags;
1067 /* Do nothing if a higher-priority exception is already in progress.
1068 * If a lower-or-equal priority exception is in progress, preempt it
1069 * and notify the main thread by sending it a signal. */
1070 spin_lock_irqsave(&fsg->lock, flags);
1071 if (fsg->state <= new_state) {
1072 fsg->exception_req_tag = fsg->ep0_req_tag;
1073 fsg->state = new_state;
1074 if (fsg->thread_task)
1075 send_sig_info(SIGUSR1, SEND_SIG_FORCED,
1078 spin_unlock_irqrestore(&fsg->lock, flags);
1082 /*-------------------------------------------------------------------------*/
1084 /* The disconnect callback and ep0 routines. These always run in_irq,
1085 * except that ep0_queue() is called in the main thread to acknowledge
1086 * completion of various requests: set config, set interface, and
1087 * Bulk-only device reset. */
1089 static void fsg_disconnect(struct usb_gadget *gadget)
1091 struct fsg_dev *fsg = get_gadget_data(gadget);
1093 DBG(fsg, "disconnect or port reset\n");
1094 raise_exception(fsg, FSG_STATE_DISCONNECT);
1098 static int ep0_queue(struct fsg_dev *fsg)
1102 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1103 if (rc != 0 && rc != -ESHUTDOWN) {
1105 /* We can't do much more than wait for a reset */
1106 WARNING(fsg, "error in submission: %s --> %d\n",
1107 fsg->ep0->name, rc);
1112 static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1114 struct fsg_dev *fsg = ep->driver_data;
1116 if (req->actual > 0)
1117 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1118 if (req->status || req->actual != req->length)
1119 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1120 req->status, req->actual, req->length);
1121 if (req->status == -ECONNRESET) // Request was cancelled
1122 usb_ep_fifo_flush(ep);
1124 if (req->status == 0 && req->context)
1125 ((fsg_routine_t) (req->context))(fsg);
1129 /*-------------------------------------------------------------------------*/
1131 /* Bulk and interrupt endpoint completion handlers.
1132 * These always run in_irq. */
1134 static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1136 struct fsg_dev *fsg = ep->driver_data;
1137 struct fsg_buffhd *bh = req->context;
1139 if (req->status || req->actual != req->length)
1140 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1141 req->status, req->actual, req->length);
1142 if (req->status == -ECONNRESET) // Request was cancelled
1143 usb_ep_fifo_flush(ep);
1145 /* Hold the lock while we update the request and buffer states */
1147 spin_lock(&fsg->lock);
1149 bh->state = BUF_STATE_EMPTY;
1151 spin_unlock(&fsg->lock);
1154 static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1156 struct fsg_dev *fsg = ep->driver_data;
1157 struct fsg_buffhd *bh = req->context;
1159 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1160 if (req->status || req->actual != bh->bulk_out_intended_length)
1161 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1162 req->status, req->actual,
1163 bh->bulk_out_intended_length);
1164 if (req->status == -ECONNRESET) // Request was cancelled
1165 usb_ep_fifo_flush(ep);
1167 /* Hold the lock while we update the request and buffer states */
1169 spin_lock(&fsg->lock);
1170 bh->outreq_busy = 0;
1171 bh->state = BUF_STATE_FULL;
1173 spin_unlock(&fsg->lock);
1177 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1178 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1180 struct fsg_dev *fsg = ep->driver_data;
1181 struct fsg_buffhd *bh = req->context;
1183 if (req->status || req->actual != req->length)
1184 DBG(fsg, "%s --> %d, %u/%u\n", __func__,
1185 req->status, req->actual, req->length);
1186 if (req->status == -ECONNRESET) // Request was cancelled
1187 usb_ep_fifo_flush(ep);
1189 /* Hold the lock while we update the request and buffer states */
1191 spin_lock(&fsg->lock);
1192 fsg->intreq_busy = 0;
1193 bh->state = BUF_STATE_EMPTY;
1195 spin_unlock(&fsg->lock);
1199 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1201 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1204 /*-------------------------------------------------------------------------*/
1206 /* Ep0 class-specific handlers. These always run in_irq. */
1208 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1209 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1211 struct usb_request *req = fsg->ep0req;
1212 static u8 cbi_reset_cmnd[6] = {
1213 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1215 /* Error in command transfer? */
1216 if (req->status || req->length != req->actual ||
1217 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1219 /* Not all controllers allow a protocol stall after
1220 * receiving control-out data, but we'll try anyway. */
1221 fsg_set_halt(fsg, fsg->ep0);
1222 return; // Wait for reset
1225 /* Is it the special reset command? */
1226 if (req->actual >= sizeof cbi_reset_cmnd &&
1227 memcmp(req->buf, cbi_reset_cmnd,
1228 sizeof cbi_reset_cmnd) == 0) {
1230 /* Raise an exception to stop the current operation
1231 * and reinitialize our state. */
1232 DBG(fsg, "cbi reset request\n");
1233 raise_exception(fsg, FSG_STATE_RESET);
1237 VDBG(fsg, "CB[I] accept device-specific command\n");
1238 spin_lock(&fsg->lock);
1240 /* Save the command for later */
1241 if (fsg->cbbuf_cmnd_size)
1242 WARNING(fsg, "CB[I] overwriting previous command\n");
1243 fsg->cbbuf_cmnd_size = req->actual;
1244 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1247 spin_unlock(&fsg->lock);
1251 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1253 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1256 static int class_setup_req(struct fsg_dev *fsg,
1257 const struct usb_ctrlrequest *ctrl)
1259 struct usb_request *req = fsg->ep0req;
1260 int value = -EOPNOTSUPP;
1261 u16 w_index = le16_to_cpu(ctrl->wIndex);
1262 u16 w_value = le16_to_cpu(ctrl->wValue);
1263 u16 w_length = le16_to_cpu(ctrl->wLength);
1268 /* Handle Bulk-only class-specific requests */
1269 if (transport_is_bbb()) {
1270 switch (ctrl->bRequest) {
1272 case USB_BULK_RESET_REQUEST:
1273 if (ctrl->bRequestType != (USB_DIR_OUT |
1274 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1276 if (w_index != 0 || w_value != 0) {
1281 /* Raise an exception to stop the current operation
1282 * and reinitialize our state. */
1283 DBG(fsg, "bulk reset request\n");
1284 raise_exception(fsg, FSG_STATE_RESET);
1285 value = DELAYED_STATUS;
1288 case USB_BULK_GET_MAX_LUN_REQUEST:
1289 if (ctrl->bRequestType != (USB_DIR_IN |
1290 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1292 if (w_index != 0 || w_value != 0) {
1296 VDBG(fsg, "get max LUN\n");
1297 *(u8 *) req->buf = fsg->nluns - 1;
1303 /* Handle CBI class-specific requests */
1305 switch (ctrl->bRequest) {
1307 case USB_CBI_ADSC_REQUEST:
1308 if (ctrl->bRequestType != (USB_DIR_OUT |
1309 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1311 if (w_index != 0 || w_value != 0) {
1315 if (w_length > MAX_COMMAND_SIZE) {
1320 fsg->ep0req->context = received_cbi_adsc;
1325 if (value == -EOPNOTSUPP)
1327 "unknown class-specific control req "
1328 "%02x.%02x v%04x i%04x l%u\n",
1329 ctrl->bRequestType, ctrl->bRequest,
1330 le16_to_cpu(ctrl->wValue), w_index, w_length);
1335 /*-------------------------------------------------------------------------*/
1337 /* Ep0 standard request handlers. These always run in_irq. */
1339 static int standard_setup_req(struct fsg_dev *fsg,
1340 const struct usb_ctrlrequest *ctrl)
1342 struct usb_request *req = fsg->ep0req;
1343 int value = -EOPNOTSUPP;
1344 u16 w_index = le16_to_cpu(ctrl->wIndex);
1345 u16 w_value = le16_to_cpu(ctrl->wValue);
1347 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1348 * but config change events will also reconfigure hardware. */
1349 switch (ctrl->bRequest) {
1351 case USB_REQ_GET_DESCRIPTOR:
1352 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1355 switch (w_value >> 8) {
1358 VDBG(fsg, "get device descriptor\n");
1359 value = sizeof device_desc;
1360 memcpy(req->buf, &device_desc, value);
1362 case USB_DT_DEVICE_QUALIFIER:
1363 VDBG(fsg, "get device qualifier\n");
1364 if (!gadget_is_dualspeed(fsg->gadget))
1366 value = sizeof dev_qualifier;
1367 memcpy(req->buf, &dev_qualifier, value);
1370 case USB_DT_OTHER_SPEED_CONFIG:
1371 VDBG(fsg, "get other-speed config descriptor\n");
1372 if (!gadget_is_dualspeed(fsg->gadget))
1376 VDBG(fsg, "get configuration descriptor\n");
1378 value = populate_config_buf(fsg->gadget,
1385 VDBG(fsg, "get string descriptor\n");
1387 /* wIndex == language code */
1388 value = usb_gadget_get_string(&stringtab,
1389 w_value & 0xff, req->buf);
1394 /* One config, two speeds */
1395 case USB_REQ_SET_CONFIGURATION:
1396 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1399 VDBG(fsg, "set configuration\n");
1400 if (w_value == CONFIG_VALUE || w_value == 0) {
1401 fsg->new_config = w_value;
1403 /* Raise an exception to wipe out previous transaction
1404 * state (queued bufs, etc) and set the new config. */
1405 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1406 value = DELAYED_STATUS;
1409 case USB_REQ_GET_CONFIGURATION:
1410 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1413 VDBG(fsg, "get configuration\n");
1414 *(u8 *) req->buf = fsg->config;
1418 case USB_REQ_SET_INTERFACE:
1419 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1420 USB_RECIP_INTERFACE))
1422 if (fsg->config && w_index == 0) {
1424 /* Raise an exception to wipe out previous transaction
1425 * state (queued bufs, etc) and install the new
1426 * interface altsetting. */
1427 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1428 value = DELAYED_STATUS;
1431 case USB_REQ_GET_INTERFACE:
1432 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1433 USB_RECIP_INTERFACE))
1441 VDBG(fsg, "get interface\n");
1442 *(u8 *) req->buf = 0;
1448 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1449 ctrl->bRequestType, ctrl->bRequest,
1450 w_value, w_index, le16_to_cpu(ctrl->wLength));
1457 static int fsg_setup(struct usb_gadget *gadget,
1458 const struct usb_ctrlrequest *ctrl)
1460 struct fsg_dev *fsg = get_gadget_data(gadget);
1462 int w_length = le16_to_cpu(ctrl->wLength);
1464 ++fsg->ep0_req_tag; // Record arrival of a new request
1465 fsg->ep0req->context = NULL;
1466 fsg->ep0req->length = 0;
1467 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1469 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1470 rc = class_setup_req(fsg, ctrl);
1472 rc = standard_setup_req(fsg, ctrl);
1474 /* Respond with data/status or defer until later? */
1475 if (rc >= 0 && rc != DELAYED_STATUS) {
1476 rc = min(rc, w_length);
1477 fsg->ep0req->length = rc;
1478 fsg->ep0req->zero = rc < w_length;
1479 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1480 "ep0-in" : "ep0-out");
1481 rc = ep0_queue(fsg);
1484 /* Device either stalls (rc < 0) or reports success */
1489 /*-------------------------------------------------------------------------*/
1491 /* All the following routines run in process context */
1494 /* Use this for bulk or interrupt transfers, not ep0 */
1495 static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1496 struct usb_request *req, int *pbusy,
1497 enum fsg_buffer_state *state)
1501 if (ep == fsg->bulk_in)
1502 dump_msg(fsg, "bulk-in", req->buf, req->length);
1503 else if (ep == fsg->intr_in)
1504 dump_msg(fsg, "intr-in", req->buf, req->length);
1506 spin_lock_irq(&fsg->lock);
1508 *state = BUF_STATE_BUSY;
1509 spin_unlock_irq(&fsg->lock);
1510 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1513 *state = BUF_STATE_EMPTY;
1515 /* We can't do much more than wait for a reset */
1517 /* Note: currently the net2280 driver fails zero-length
1518 * submissions if DMA is enabled. */
1519 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1521 WARNING(fsg, "error in submission: %s --> %d\n",
1527 static int sleep_thread(struct fsg_dev *fsg)
1531 /* Wait until a signal arrives or we are woken up */
1534 set_current_state(TASK_INTERRUPTIBLE);
1535 if (signal_pending(current)) {
1539 if (fsg->thread_wakeup_needed)
1543 __set_current_state(TASK_RUNNING);
1544 fsg->thread_wakeup_needed = 0;
1549 /*-------------------------------------------------------------------------*/
1551 static int do_read(struct fsg_dev *fsg)
1553 struct lun *curlun = fsg->curlun;
1555 struct fsg_buffhd *bh;
1558 loff_t file_offset, file_offset_tmp;
1559 unsigned int amount;
1560 unsigned int partial_page;
1563 /* Get the starting Logical Block Address and check that it's
1565 if (fsg->cmnd[0] == SC_READ_6)
1566 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1568 lba = get_be32(&fsg->cmnd[2]);
1570 /* We allow DPO (Disable Page Out = don't save data in the
1571 * cache) and FUA (Force Unit Access = don't read from the
1572 * cache), but we don't implement them. */
1573 if ((fsg->cmnd[1] & ~0x18) != 0) {
1574 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1578 if (lba >= curlun->num_sectors) {
1579 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1582 file_offset = ((loff_t) lba) << 9;
1584 /* Carry out the file reads */
1585 amount_left = fsg->data_size_from_cmnd;
1586 if (unlikely(amount_left == 0))
1587 return -EIO; // No default reply
1591 /* Figure out how much we need to read:
1592 * Try to read the remaining amount.
1593 * But don't read more than the buffer size.
1594 * And don't try to read past the end of the file.
1595 * Finally, if we're not at a page boundary, don't read past
1597 * If this means reading 0 then we were asked to read past
1598 * the end of file. */
1599 amount = min((unsigned int) amount_left, mod_data.buflen);
1600 amount = min((loff_t) amount,
1601 curlun->file_length - file_offset);
1602 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1603 if (partial_page > 0)
1604 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1607 /* Wait for the next buffer to become available */
1608 bh = fsg->next_buffhd_to_fill;
1609 while (bh->state != BUF_STATE_EMPTY) {
1610 rc = sleep_thread(fsg);
1615 /* If we were asked to read past the end of file,
1616 * end with an empty buffer. */
1618 curlun->sense_data =
1619 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1620 curlun->sense_data_info = file_offset >> 9;
1621 curlun->info_valid = 1;
1622 bh->inreq->length = 0;
1623 bh->state = BUF_STATE_FULL;
1627 /* Perform the read */
1628 file_offset_tmp = file_offset;
1629 nread = vfs_read(curlun->filp,
1630 (char __user *) bh->buf,
1631 amount, &file_offset_tmp);
1632 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1633 (unsigned long long) file_offset,
1635 if (signal_pending(current))
1639 LDBG(curlun, "error in file read: %d\n",
1642 } else if (nread < amount) {
1643 LDBG(curlun, "partial file read: %d/%u\n",
1644 (int) nread, amount);
1645 nread -= (nread & 511); // Round down to a block
1647 file_offset += nread;
1648 amount_left -= nread;
1649 fsg->residue -= nread;
1650 bh->inreq->length = nread;
1651 bh->state = BUF_STATE_FULL;
1653 /* If an error occurred, report it and its position */
1654 if (nread < amount) {
1655 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1656 curlun->sense_data_info = file_offset >> 9;
1657 curlun->info_valid = 1;
1661 if (amount_left == 0)
1662 break; // No more left to read
1664 /* Send this buffer and go read some more */
1665 bh->inreq->zero = 0;
1666 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1667 &bh->inreq_busy, &bh->state);
1668 fsg->next_buffhd_to_fill = bh->next;
1671 return -EIO; // No default reply
1675 /*-------------------------------------------------------------------------*/
1677 static int do_write(struct fsg_dev *fsg)
1679 struct lun *curlun = fsg->curlun;
1681 struct fsg_buffhd *bh;
1683 u32 amount_left_to_req, amount_left_to_write;
1684 loff_t usb_offset, file_offset, file_offset_tmp;
1685 unsigned int amount;
1686 unsigned int partial_page;
1691 curlun->sense_data = SS_WRITE_PROTECTED;
1694 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1696 /* Get the starting Logical Block Address and check that it's
1698 if (fsg->cmnd[0] == SC_WRITE_6)
1699 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1701 lba = get_be32(&fsg->cmnd[2]);
1703 /* We allow DPO (Disable Page Out = don't save data in the
1704 * cache) and FUA (Force Unit Access = write directly to the
1705 * medium). We don't implement DPO; we implement FUA by
1706 * performing synchronous output. */
1707 if ((fsg->cmnd[1] & ~0x18) != 0) {
1708 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1711 if (fsg->cmnd[1] & 0x08) // FUA
1712 curlun->filp->f_flags |= O_SYNC;
1714 if (lba >= curlun->num_sectors) {
1715 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1719 /* Carry out the file writes */
1721 file_offset = usb_offset = ((loff_t) lba) << 9;
1722 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1724 while (amount_left_to_write > 0) {
1726 /* Queue a request for more data from the host */
1727 bh = fsg->next_buffhd_to_fill;
1728 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1730 /* Figure out how much we want to get:
1731 * Try to get the remaining amount.
1732 * But don't get more than the buffer size.
1733 * And don't try to go past the end of the file.
1734 * If we're not at a page boundary,
1735 * don't go past the next page.
1736 * If this means getting 0, then we were asked
1737 * to write past the end of file.
1738 * Finally, round down to a block boundary. */
1739 amount = min(amount_left_to_req, mod_data.buflen);
1740 amount = min((loff_t) amount, curlun->file_length -
1742 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1743 if (partial_page > 0)
1744 amount = min(amount,
1745 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1749 curlun->sense_data =
1750 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1751 curlun->sense_data_info = usb_offset >> 9;
1752 curlun->info_valid = 1;
1755 amount -= (amount & 511);
1758 /* Why were we were asked to transfer a
1764 /* Get the next buffer */
1765 usb_offset += amount;
1766 fsg->usb_amount_left -= amount;
1767 amount_left_to_req -= amount;
1768 if (amount_left_to_req == 0)
1771 /* amount is always divisible by 512, hence by
1772 * the bulk-out maxpacket size */
1773 bh->outreq->length = bh->bulk_out_intended_length =
1775 bh->outreq->short_not_ok = 1;
1776 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1777 &bh->outreq_busy, &bh->state);
1778 fsg->next_buffhd_to_fill = bh->next;
1782 /* Write the received data to the backing file */
1783 bh = fsg->next_buffhd_to_drain;
1784 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1785 break; // We stopped early
1786 if (bh->state == BUF_STATE_FULL) {
1788 fsg->next_buffhd_to_drain = bh->next;
1789 bh->state = BUF_STATE_EMPTY;
1791 /* Did something go wrong with the transfer? */
1792 if (bh->outreq->status != 0) {
1793 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1794 curlun->sense_data_info = file_offset >> 9;
1795 curlun->info_valid = 1;
1799 amount = bh->outreq->actual;
1800 if (curlun->file_length - file_offset < amount) {
1802 "write %u @ %llu beyond end %llu\n",
1803 amount, (unsigned long long) file_offset,
1804 (unsigned long long) curlun->file_length);
1805 amount = curlun->file_length - file_offset;
1808 /* Perform the write */
1809 file_offset_tmp = file_offset;
1810 nwritten = vfs_write(curlun->filp,
1811 (char __user *) bh->buf,
1812 amount, &file_offset_tmp);
1813 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1814 (unsigned long long) file_offset,
1816 if (signal_pending(current))
1817 return -EINTR; // Interrupted!
1820 LDBG(curlun, "error in file write: %d\n",
1823 } else if (nwritten < amount) {
1824 LDBG(curlun, "partial file write: %d/%u\n",
1825 (int) nwritten, amount);
1826 nwritten -= (nwritten & 511);
1827 // Round down to a block
1829 file_offset += nwritten;
1830 amount_left_to_write -= nwritten;
1831 fsg->residue -= nwritten;
1833 /* If an error occurred, report it and its position */
1834 if (nwritten < amount) {
1835 curlun->sense_data = SS_WRITE_ERROR;
1836 curlun->sense_data_info = file_offset >> 9;
1837 curlun->info_valid = 1;
1841 /* Did the host decide to stop early? */
1842 if (bh->outreq->actual != bh->outreq->length) {
1843 fsg->short_packet_received = 1;
1849 /* Wait for something to happen */
1850 rc = sleep_thread(fsg);
1855 return -EIO; // No default reply
1859 /*-------------------------------------------------------------------------*/
1861 /* Sync the file data, don't bother with the metadata.
1862 * This code was copied from fs/buffer.c:sys_fdatasync(). */
1863 static int fsync_sub(struct lun *curlun)
1865 struct file *filp = curlun->filp;
1867 if (curlun->ro || !filp)
1869 return vfs_fsync(filp, filp->f_path.dentry, 1);
1872 static void fsync_all(struct fsg_dev *fsg)
1876 for (i = 0; i < fsg->nluns; ++i)
1877 fsync_sub(&fsg->luns[i]);
1880 static int do_synchronize_cache(struct fsg_dev *fsg)
1882 struct lun *curlun = fsg->curlun;
1885 /* We ignore the requested LBA and write out all file's
1886 * dirty data buffers. */
1887 rc = fsync_sub(curlun);
1889 curlun->sense_data = SS_WRITE_ERROR;
1894 /*-------------------------------------------------------------------------*/
1896 static void invalidate_sub(struct lun *curlun)
1898 struct file *filp = curlun->filp;
1899 struct inode *inode = filp->f_path.dentry->d_inode;
1902 rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
1903 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1906 static int do_verify(struct fsg_dev *fsg)
1908 struct lun *curlun = fsg->curlun;
1910 u32 verification_length;
1911 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1912 loff_t file_offset, file_offset_tmp;
1914 unsigned int amount;
1917 /* Get the starting Logical Block Address and check that it's
1919 lba = get_be32(&fsg->cmnd[2]);
1920 if (lba >= curlun->num_sectors) {
1921 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1925 /* We allow DPO (Disable Page Out = don't save data in the
1926 * cache) but we don't implement it. */
1927 if ((fsg->cmnd[1] & ~0x10) != 0) {
1928 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1932 verification_length = get_be16(&fsg->cmnd[7]);
1933 if (unlikely(verification_length == 0))
1934 return -EIO; // No default reply
1936 /* Prepare to carry out the file verify */
1937 amount_left = verification_length << 9;
1938 file_offset = ((loff_t) lba) << 9;
1940 /* Write out all the dirty buffers before invalidating them */
1942 if (signal_pending(current))
1945 invalidate_sub(curlun);
1946 if (signal_pending(current))
1949 /* Just try to read the requested blocks */
1950 while (amount_left > 0) {
1952 /* Figure out how much we need to read:
1953 * Try to read the remaining amount, but not more than
1955 * And don't try to read past the end of the file.
1956 * If this means reading 0 then we were asked to read
1957 * past the end of file. */
1958 amount = min((unsigned int) amount_left, mod_data.buflen);
1959 amount = min((loff_t) amount,
1960 curlun->file_length - file_offset);
1962 curlun->sense_data =
1963 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1964 curlun->sense_data_info = file_offset >> 9;
1965 curlun->info_valid = 1;
1969 /* Perform the read */
1970 file_offset_tmp = file_offset;
1971 nread = vfs_read(curlun->filp,
1972 (char __user *) bh->buf,
1973 amount, &file_offset_tmp);
1974 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1975 (unsigned long long) file_offset,
1977 if (signal_pending(current))
1981 LDBG(curlun, "error in file verify: %d\n",
1984 } else if (nread < amount) {
1985 LDBG(curlun, "partial file verify: %d/%u\n",
1986 (int) nread, amount);
1987 nread -= (nread & 511); // Round down to a sector
1990 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1991 curlun->sense_data_info = file_offset >> 9;
1992 curlun->info_valid = 1;
1995 file_offset += nread;
1996 amount_left -= nread;
2002 /*-------------------------------------------------------------------------*/
2004 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2006 u8 *buf = (u8 *) bh->buf;
2008 static char vendor_id[] = "Linux ";
2009 static char product_id[] = "File-Stor Gadget";
2011 if (!fsg->curlun) { // Unsupported LUNs are okay
2012 fsg->bad_lun_okay = 1;
2014 buf[0] = 0x7f; // Unsupported, no device-type
2018 memset(buf, 0, 8); // Non-removable, direct-access device
2019 if (mod_data.removable)
2021 buf[2] = 2; // ANSI SCSI level 2
2022 buf[3] = 2; // SCSI-2 INQUIRY data format
2023 buf[4] = 31; // Additional length
2024 // No special options
2025 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2031 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2033 struct lun *curlun = fsg->curlun;
2034 u8 *buf = (u8 *) bh->buf;
2039 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2041 * If a REQUEST SENSE command is received from an initiator
2042 * with a pending unit attention condition (before the target
2043 * generates the contingent allegiance condition), then the
2044 * target shall either:
2045 * a) report any pending sense data and preserve the unit
2046 * attention condition on the logical unit, or,
2047 * b) report the unit attention condition, may discard any
2048 * pending sense data, and clear the unit attention
2049 * condition on the logical unit for that initiator.
2051 * FSG normally uses option a); enable this code to use option b).
2054 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2055 curlun->sense_data = curlun->unit_attention_data;
2056 curlun->unit_attention_data = SS_NO_SENSE;
2060 if (!curlun) { // Unsupported LUNs are okay
2061 fsg->bad_lun_okay = 1;
2062 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2066 sd = curlun->sense_data;
2067 sdinfo = curlun->sense_data_info;
2068 valid = curlun->info_valid << 7;
2069 curlun->sense_data = SS_NO_SENSE;
2070 curlun->sense_data_info = 0;
2071 curlun->info_valid = 0;
2075 buf[0] = valid | 0x70; // Valid, current error
2077 put_be32(&buf[3], sdinfo); // Sense information
2078 buf[7] = 18 - 8; // Additional sense length
2085 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2087 struct lun *curlun = fsg->curlun;
2088 u32 lba = get_be32(&fsg->cmnd[2]);
2089 int pmi = fsg->cmnd[8];
2090 u8 *buf = (u8 *) bh->buf;
2092 /* Check the PMI and LBA fields */
2093 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2094 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2098 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2099 put_be32(&buf[4], 512); // Block length
2104 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2106 struct lun *curlun = fsg->curlun;
2107 int mscmnd = fsg->cmnd[0];
2108 u8 *buf = (u8 *) bh->buf;
2111 int changeable_values, all_pages;
2115 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2116 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2119 pc = fsg->cmnd[2] >> 6;
2120 page_code = fsg->cmnd[2] & 0x3f;
2122 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2125 changeable_values = (pc == 1);
2126 all_pages = (page_code == 0x3f);
2128 /* Write the mode parameter header. Fixed values are: default
2129 * medium type, no cache control (DPOFUA), and no block descriptors.
2130 * The only variable value is the WriteProtect bit. We will fill in
2131 * the mode data length later. */
2133 if (mscmnd == SC_MODE_SENSE_6) {
2134 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2137 } else { // SC_MODE_SENSE_10
2138 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2140 limit = 65535; // Should really be mod_data.buflen
2143 /* No block descriptors */
2145 /* The mode pages, in numerical order. The only page we support
2146 * is the Caching page. */
2147 if (page_code == 0x08 || all_pages) {
2149 buf[0] = 0x08; // Page code
2150 buf[1] = 10; // Page length
2151 memset(buf+2, 0, 10); // None of the fields are changeable
2153 if (!changeable_values) {
2154 buf[2] = 0x04; // Write cache enable,
2155 // Read cache not disabled
2156 // No cache retention priorities
2157 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2158 // Minimum prefetch = 0
2159 put_be16(&buf[8], 0xffff); // Maximum prefetch
2160 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2165 /* Check that a valid page was requested and the mode data length
2166 * isn't too long. */
2168 if (!valid_page || len > limit) {
2169 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2173 /* Store the mode data length */
2174 if (mscmnd == SC_MODE_SENSE_6)
2177 put_be16(buf0, len - 2);
2182 static int do_start_stop(struct fsg_dev *fsg)
2184 struct lun *curlun = fsg->curlun;
2187 if (!mod_data.removable) {
2188 curlun->sense_data = SS_INVALID_COMMAND;
2192 // int immed = fsg->cmnd[1] & 0x01;
2193 loej = fsg->cmnd[4] & 0x02;
2194 start = fsg->cmnd[4] & 0x01;
2196 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2197 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2198 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2199 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2205 /* Are we allowed to unload the media? */
2206 if (curlun->prevent_medium_removal) {
2207 LDBG(curlun, "unload attempt prevented\n");
2208 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2211 if (loej) { // Simulate an unload/eject
2212 up_read(&fsg->filesem);
2213 down_write(&fsg->filesem);
2214 close_backing_file(curlun);
2215 up_write(&fsg->filesem);
2216 down_read(&fsg->filesem);
2220 /* Our emulation doesn't support mounting; the medium is
2221 * available for use as soon as it is loaded. */
2222 if (!backing_file_is_open(curlun)) {
2223 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2232 static int do_prevent_allow(struct fsg_dev *fsg)
2234 struct lun *curlun = fsg->curlun;
2237 if (!mod_data.removable) {
2238 curlun->sense_data = SS_INVALID_COMMAND;
2242 prevent = fsg->cmnd[4] & 0x01;
2243 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2244 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2248 if (curlun->prevent_medium_removal && !prevent)
2250 curlun->prevent_medium_removal = prevent;
2255 static int do_read_format_capacities(struct fsg_dev *fsg,
2256 struct fsg_buffhd *bh)
2258 struct lun *curlun = fsg->curlun;
2259 u8 *buf = (u8 *) bh->buf;
2261 buf[0] = buf[1] = buf[2] = 0;
2262 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2265 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2266 put_be32(&buf[4], 512); // Block length
2267 buf[4] = 0x02; // Current capacity
2272 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2274 struct lun *curlun = fsg->curlun;
2276 /* We don't support MODE SELECT */
2277 curlun->sense_data = SS_INVALID_COMMAND;
2282 /*-------------------------------------------------------------------------*/
2284 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2288 rc = fsg_set_halt(fsg, fsg->bulk_in);
2290 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2292 if (rc != -EAGAIN) {
2293 WARNING(fsg, "usb_ep_set_halt -> %d\n", rc);
2298 /* Wait for a short time and then try again */
2299 if (msleep_interruptible(100) != 0)
2301 rc = usb_ep_set_halt(fsg->bulk_in);
2306 static int wedge_bulk_in_endpoint(struct fsg_dev *fsg)
2310 DBG(fsg, "bulk-in set wedge\n");
2311 rc = usb_ep_set_wedge(fsg->bulk_in);
2313 VDBG(fsg, "delayed bulk-in endpoint wedge\n");
2315 if (rc != -EAGAIN) {
2316 WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc);
2321 /* Wait for a short time and then try again */
2322 if (msleep_interruptible(100) != 0)
2324 rc = usb_ep_set_wedge(fsg->bulk_in);
2329 static int pad_with_zeros(struct fsg_dev *fsg)
2331 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2332 u32 nkeep = bh->inreq->length;
2336 bh->state = BUF_STATE_EMPTY; // For the first iteration
2337 fsg->usb_amount_left = nkeep + fsg->residue;
2338 while (fsg->usb_amount_left > 0) {
2340 /* Wait for the next buffer to be free */
2341 while (bh->state != BUF_STATE_EMPTY) {
2342 rc = sleep_thread(fsg);
2347 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2348 memset(bh->buf + nkeep, 0, nsend - nkeep);
2349 bh->inreq->length = nsend;
2350 bh->inreq->zero = 0;
2351 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2352 &bh->inreq_busy, &bh->state);
2353 bh = fsg->next_buffhd_to_fill = bh->next;
2354 fsg->usb_amount_left -= nsend;
2360 static int throw_away_data(struct fsg_dev *fsg)
2362 struct fsg_buffhd *bh;
2366 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2367 fsg->usb_amount_left > 0) {
2369 /* Throw away the data in a filled buffer */
2370 if (bh->state == BUF_STATE_FULL) {
2372 bh->state = BUF_STATE_EMPTY;
2373 fsg->next_buffhd_to_drain = bh->next;
2375 /* A short packet or an error ends everything */
2376 if (bh->outreq->actual != bh->outreq->length ||
2377 bh->outreq->status != 0) {
2378 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2384 /* Try to submit another request if we need one */
2385 bh = fsg->next_buffhd_to_fill;
2386 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2387 amount = min(fsg->usb_amount_left,
2388 (u32) mod_data.buflen);
2390 /* amount is always divisible by 512, hence by
2391 * the bulk-out maxpacket size */
2392 bh->outreq->length = bh->bulk_out_intended_length =
2394 bh->outreq->short_not_ok = 1;
2395 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2396 &bh->outreq_busy, &bh->state);
2397 fsg->next_buffhd_to_fill = bh->next;
2398 fsg->usb_amount_left -= amount;
2402 /* Otherwise wait for something to happen */
2403 rc = sleep_thread(fsg);
2411 static int finish_reply(struct fsg_dev *fsg)
2413 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2416 switch (fsg->data_dir) {
2418 break; // Nothing to send
2420 /* If we don't know whether the host wants to read or write,
2421 * this must be CB or CBI with an unknown command. We mustn't
2422 * try to send or receive any data. So stall both bulk pipes
2423 * if we can and wait for a reset. */
2424 case DATA_DIR_UNKNOWN:
2425 if (mod_data.can_stall) {
2426 fsg_set_halt(fsg, fsg->bulk_out);
2427 rc = halt_bulk_in_endpoint(fsg);
2431 /* All but the last buffer of data must have already been sent */
2432 case DATA_DIR_TO_HOST:
2433 if (fsg->data_size == 0)
2434 ; // Nothing to send
2436 /* If there's no residue, simply send the last buffer */
2437 else if (fsg->residue == 0) {
2438 bh->inreq->zero = 0;
2439 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2440 &bh->inreq_busy, &bh->state);
2441 fsg->next_buffhd_to_fill = bh->next;
2444 /* There is a residue. For CB and CBI, simply mark the end
2445 * of the data with a short packet. However, if we are
2446 * allowed to stall, there was no data at all (residue ==
2447 * data_size), and the command failed (invalid LUN or
2448 * sense data is set), then halt the bulk-in endpoint
2450 else if (!transport_is_bbb()) {
2451 if (mod_data.can_stall &&
2452 fsg->residue == fsg->data_size &&
2453 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2454 bh->state = BUF_STATE_EMPTY;
2455 rc = halt_bulk_in_endpoint(fsg);
2457 bh->inreq->zero = 1;
2458 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2459 &bh->inreq_busy, &bh->state);
2460 fsg->next_buffhd_to_fill = bh->next;
2464 /* For Bulk-only, if we're allowed to stall then send the
2465 * short packet and halt the bulk-in endpoint. If we can't
2466 * stall, pad out the remaining data with 0's. */
2468 if (mod_data.can_stall) {
2469 bh->inreq->zero = 1;
2470 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2471 &bh->inreq_busy, &bh->state);
2472 fsg->next_buffhd_to_fill = bh->next;
2473 rc = halt_bulk_in_endpoint(fsg);
2475 rc = pad_with_zeros(fsg);
2479 /* We have processed all we want from the data the host has sent.
2480 * There may still be outstanding bulk-out requests. */
2481 case DATA_DIR_FROM_HOST:
2482 if (fsg->residue == 0)
2483 ; // Nothing to receive
2485 /* Did the host stop sending unexpectedly early? */
2486 else if (fsg->short_packet_received) {
2487 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2491 /* We haven't processed all the incoming data. Even though
2492 * we may be allowed to stall, doing so would cause a race.
2493 * The controller may already have ACK'ed all the remaining
2494 * bulk-out packets, in which case the host wouldn't see a
2495 * STALL. Not realizing the endpoint was halted, it wouldn't
2496 * clear the halt -- leading to problems later on. */
2498 else if (mod_data.can_stall) {
2499 fsg_set_halt(fsg, fsg->bulk_out);
2500 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2505 /* We can't stall. Read in the excess data and throw it
2508 rc = throw_away_data(fsg);
2515 static int send_status(struct fsg_dev *fsg)
2517 struct lun *curlun = fsg->curlun;
2518 struct fsg_buffhd *bh;
2520 u8 status = USB_STATUS_PASS;
2523 /* Wait for the next buffer to become available */
2524 bh = fsg->next_buffhd_to_fill;
2525 while (bh->state != BUF_STATE_EMPTY) {
2526 rc = sleep_thread(fsg);
2532 sd = curlun->sense_data;
2533 sdinfo = curlun->sense_data_info;
2534 } else if (fsg->bad_lun_okay)
2537 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2539 if (fsg->phase_error) {
2540 DBG(fsg, "sending phase-error status\n");
2541 status = USB_STATUS_PHASE_ERROR;
2542 sd = SS_INVALID_COMMAND;
2543 } else if (sd != SS_NO_SENSE) {
2544 DBG(fsg, "sending command-failure status\n");
2545 status = USB_STATUS_FAIL;
2546 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2548 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2551 if (transport_is_bbb()) {
2552 struct bulk_cs_wrap *csw = bh->buf;
2554 /* Store and send the Bulk-only CSW */
2555 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2556 csw->Tag = fsg->tag;
2557 csw->Residue = cpu_to_le32(fsg->residue);
2558 csw->Status = status;
2560 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2561 bh->inreq->zero = 0;
2562 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2563 &bh->inreq_busy, &bh->state);
2565 } else if (mod_data.transport_type == USB_PR_CB) {
2567 /* Control-Bulk transport has no status phase! */
2570 } else { // USB_PR_CBI
2571 struct interrupt_data *buf = bh->buf;
2573 /* Store and send the Interrupt data. UFI sends the ASC
2574 * and ASCQ bytes. Everything else sends a Type (which
2575 * is always 0) and the status Value. */
2576 if (mod_data.protocol_type == USB_SC_UFI) {
2577 buf->bType = ASC(sd);
2578 buf->bValue = ASCQ(sd);
2581 buf->bValue = status;
2583 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2585 fsg->intr_buffhd = bh; // Point to the right buffhd
2586 fsg->intreq->buf = bh->inreq->buf;
2587 fsg->intreq->context = bh;
2588 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2589 &fsg->intreq_busy, &bh->state);
2592 fsg->next_buffhd_to_fill = bh->next;
2597 /*-------------------------------------------------------------------------*/
2599 /* Check whether the command is properly formed and whether its data size
2600 * and direction agree with the values we already have. */
2601 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2602 enum data_direction data_dir, unsigned int mask,
2603 int needs_medium, const char *name)
2606 int lun = fsg->cmnd[1] >> 5;
2607 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2611 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2612 * Transparent SCSI doesn't pad. */
2613 if (protocol_is_scsi())
2616 /* There's some disagreement as to whether RBC pads commands or not.
2617 * We'll play it safe and accept either form. */
2618 else if (mod_data.protocol_type == USB_SC_RBC) {
2619 if (fsg->cmnd_size == 12)
2622 /* All the other protocols pad to 12 bytes */
2627 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2628 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2630 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2631 name, cmnd_size, dirletter[(int) data_dir],
2632 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2634 /* We can't reply at all until we know the correct data direction
2636 if (fsg->data_size_from_cmnd == 0)
2637 data_dir = DATA_DIR_NONE;
2638 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2639 fsg->data_dir = data_dir;
2640 fsg->data_size = fsg->data_size_from_cmnd;
2642 } else { // Bulk-only
2643 if (fsg->data_size < fsg->data_size_from_cmnd) {
2645 /* Host data size < Device data size is a phase error.
2646 * Carry out the command, but only transfer as much
2647 * as we are allowed. */
2648 fsg->data_size_from_cmnd = fsg->data_size;
2649 fsg->phase_error = 1;
2652 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2654 /* Conflicting data directions is a phase error */
2655 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2656 fsg->phase_error = 1;
2660 /* Verify the length of the command itself */
2661 if (cmnd_size != fsg->cmnd_size) {
2663 /* Special case workaround: There are plenty of buggy SCSI
2664 * implementations. Many have issues with cbw->Length
2665 * field passing a wrong command size. For those cases we
2666 * always try to work around the problem by using the length
2667 * sent by the host side provided it is at least as large
2668 * as the correct command length.
2669 * Examples of such cases would be MS-Windows, which issues
2670 * REQUEST SENSE with cbw->Length == 12 where it should
2671 * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
2672 * REQUEST SENSE with cbw->Length == 10 where it should
2675 if (cmnd_size <= fsg->cmnd_size) {
2676 DBG(fsg, "%s is buggy! Expected length %d "
2677 "but we got %d\n", name,
2678 cmnd_size, fsg->cmnd_size);
2679 cmnd_size = fsg->cmnd_size;
2681 fsg->phase_error = 1;
2686 /* Check that the LUN values are consistent */
2687 if (transport_is_bbb()) {
2688 if (fsg->lun != lun)
2689 DBG(fsg, "using LUN %d from CBW, "
2690 "not LUN %d from CDB\n",
2693 fsg->lun = lun; // Use LUN from the command
2696 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2697 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2698 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2699 curlun->sense_data = SS_NO_SENSE;
2700 curlun->sense_data_info = 0;
2701 curlun->info_valid = 0;
2704 fsg->curlun = curlun = NULL;
2705 fsg->bad_lun_okay = 0;
2707 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2708 * to use unsupported LUNs; all others may not. */
2709 if (fsg->cmnd[0] != SC_INQUIRY &&
2710 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2711 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2716 /* If a unit attention condition exists, only INQUIRY and
2717 * REQUEST SENSE commands are allowed; anything else must fail. */
2718 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2719 fsg->cmnd[0] != SC_INQUIRY &&
2720 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2721 curlun->sense_data = curlun->unit_attention_data;
2722 curlun->unit_attention_data = SS_NO_SENSE;
2726 /* Check that only command bytes listed in the mask are non-zero */
2727 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2728 for (i = 1; i < cmnd_size; ++i) {
2729 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2731 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2736 /* If the medium isn't mounted and the command needs to access
2737 * it, return an error. */
2738 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2739 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2747 static int do_scsi_command(struct fsg_dev *fsg)
2749 struct fsg_buffhd *bh;
2751 int reply = -EINVAL;
2753 static char unknown[16];
2757 /* Wait for the next buffer to become available for data or status */
2758 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2759 while (bh->state != BUF_STATE_EMPTY) {
2760 rc = sleep_thread(fsg);
2764 fsg->phase_error = 0;
2765 fsg->short_packet_received = 0;
2767 down_read(&fsg->filesem); // We're using the backing file
2768 switch (fsg->cmnd[0]) {
2771 fsg->data_size_from_cmnd = fsg->cmnd[4];
2772 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2775 reply = do_inquiry(fsg, bh);
2778 case SC_MODE_SELECT_6:
2779 fsg->data_size_from_cmnd = fsg->cmnd[4];
2780 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2782 "MODE SELECT(6)")) == 0)
2783 reply = do_mode_select(fsg, bh);
2786 case SC_MODE_SELECT_10:
2787 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2788 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2790 "MODE SELECT(10)")) == 0)
2791 reply = do_mode_select(fsg, bh);
2794 case SC_MODE_SENSE_6:
2795 fsg->data_size_from_cmnd = fsg->cmnd[4];
2796 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2797 (1<<1) | (1<<2) | (1<<4), 0,
2798 "MODE SENSE(6)")) == 0)
2799 reply = do_mode_sense(fsg, bh);
2802 case SC_MODE_SENSE_10:
2803 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2804 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2805 (1<<1) | (1<<2) | (3<<7), 0,
2806 "MODE SENSE(10)")) == 0)
2807 reply = do_mode_sense(fsg, bh);
2810 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2811 fsg->data_size_from_cmnd = 0;
2812 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2814 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2815 reply = do_prevent_allow(fsg);
2820 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2821 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2824 reply = do_read(fsg);
2828 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2829 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2830 (1<<1) | (0xf<<2) | (3<<7), 1,
2832 reply = do_read(fsg);
2836 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2837 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2838 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2840 reply = do_read(fsg);
2843 case SC_READ_CAPACITY:
2844 fsg->data_size_from_cmnd = 8;
2845 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2846 (0xf<<2) | (1<<8), 1,
2847 "READ CAPACITY")) == 0)
2848 reply = do_read_capacity(fsg, bh);
2851 case SC_READ_FORMAT_CAPACITIES:
2852 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2853 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2855 "READ FORMAT CAPACITIES")) == 0)
2856 reply = do_read_format_capacities(fsg, bh);
2859 case SC_REQUEST_SENSE:
2860 fsg->data_size_from_cmnd = fsg->cmnd[4];
2861 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2863 "REQUEST SENSE")) == 0)
2864 reply = do_request_sense(fsg, bh);
2867 case SC_START_STOP_UNIT:
2868 fsg->data_size_from_cmnd = 0;
2869 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2871 "START-STOP UNIT")) == 0)
2872 reply = do_start_stop(fsg);
2875 case SC_SYNCHRONIZE_CACHE:
2876 fsg->data_size_from_cmnd = 0;
2877 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2878 (0xf<<2) | (3<<7), 1,
2879 "SYNCHRONIZE CACHE")) == 0)
2880 reply = do_synchronize_cache(fsg);
2883 case SC_TEST_UNIT_READY:
2884 fsg->data_size_from_cmnd = 0;
2885 reply = check_command(fsg, 6, DATA_DIR_NONE,
2890 /* Although optional, this command is used by MS-Windows. We
2891 * support a minimal version: BytChk must be 0. */
2893 fsg->data_size_from_cmnd = 0;
2894 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2895 (1<<1) | (0xf<<2) | (3<<7), 1,
2897 reply = do_verify(fsg);
2902 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2903 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2906 reply = do_write(fsg);
2910 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2911 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2912 (1<<1) | (0xf<<2) | (3<<7), 1,
2914 reply = do_write(fsg);
2918 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2919 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2920 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2922 reply = do_write(fsg);
2925 /* Some mandatory commands that we recognize but don't implement.
2926 * They don't mean much in this setting. It's left as an exercise
2927 * for anyone interested to implement RESERVE and RELEASE in terms
2928 * of Posix locks. */
2929 case SC_FORMAT_UNIT:
2932 case SC_SEND_DIAGNOSTIC:
2936 fsg->data_size_from_cmnd = 0;
2937 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2938 if ((reply = check_command(fsg, fsg->cmnd_size,
2939 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2940 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2945 up_read(&fsg->filesem);
2947 if (reply == -EINTR || signal_pending(current))
2950 /* Set up the single reply buffer for finish_reply() */
2951 if (reply == -EINVAL)
2952 reply = 0; // Error reply length
2953 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2954 reply = min((u32) reply, fsg->data_size_from_cmnd);
2955 bh->inreq->length = reply;
2956 bh->state = BUF_STATE_FULL;
2957 fsg->residue -= reply;
2958 } // Otherwise it's already set
2964 /*-------------------------------------------------------------------------*/
2966 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2968 struct usb_request *req = bh->outreq;
2969 struct bulk_cb_wrap *cbw = req->buf;
2971 /* Was this a real packet? Should it be ignored? */
2972 if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
2975 /* Is the CBW valid? */
2976 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2977 cbw->Signature != __constant_cpu_to_le32(
2979 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2981 le32_to_cpu(cbw->Signature));
2983 /* The Bulk-only spec says we MUST stall the IN endpoint
2984 * (6.6.1), so it's unavoidable. It also says we must
2985 * retain this state until the next reset, but there's
2986 * no way to tell the controller driver it should ignore
2987 * Clear-Feature(HALT) requests.
2989 * We aren't required to halt the OUT endpoint; instead
2990 * we can simply accept and discard any data received
2991 * until the next reset. */
2992 wedge_bulk_in_endpoint(fsg);
2993 set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
2997 /* Is the CBW meaningful? */
2998 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
2999 cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) {
3000 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
3002 cbw->Lun, cbw->Flags, cbw->Length);
3004 /* We can do anything we want here, so let's stall the
3005 * bulk pipes if we are allowed to. */
3006 if (mod_data.can_stall) {
3007 fsg_set_halt(fsg, fsg->bulk_out);
3008 halt_bulk_in_endpoint(fsg);
3013 /* Save the command for later */
3014 fsg->cmnd_size = cbw->Length;
3015 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
3016 if (cbw->Flags & USB_BULK_IN_FLAG)
3017 fsg->data_dir = DATA_DIR_TO_HOST;
3019 fsg->data_dir = DATA_DIR_FROM_HOST;
3020 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
3021 if (fsg->data_size == 0)
3022 fsg->data_dir = DATA_DIR_NONE;
3023 fsg->lun = cbw->Lun;
3024 fsg->tag = cbw->Tag;
3029 static int get_next_command(struct fsg_dev *fsg)
3031 struct fsg_buffhd *bh;
3034 if (transport_is_bbb()) {
3036 /* Wait for the next buffer to become available */
3037 bh = fsg->next_buffhd_to_fill;
3038 while (bh->state != BUF_STATE_EMPTY) {
3039 rc = sleep_thread(fsg);
3044 /* Queue a request to read a Bulk-only CBW */
3045 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3046 bh->outreq->short_not_ok = 1;
3047 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3048 &bh->outreq_busy, &bh->state);
3050 /* We will drain the buffer in software, which means we
3051 * can reuse it for the next filling. No need to advance
3052 * next_buffhd_to_fill. */
3054 /* Wait for the CBW to arrive */
3055 while (bh->state != BUF_STATE_FULL) {
3056 rc = sleep_thread(fsg);
3061 rc = received_cbw(fsg, bh);
3062 bh->state = BUF_STATE_EMPTY;
3064 } else { // USB_PR_CB or USB_PR_CBI
3066 /* Wait for the next command to arrive */
3067 while (fsg->cbbuf_cmnd_size == 0) {
3068 rc = sleep_thread(fsg);
3073 /* Is the previous status interrupt request still busy?
3074 * The host is allowed to skip reading the status,
3075 * so we must cancel it. */
3076 if (fsg->intreq_busy)
3077 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3079 /* Copy the command and mark the buffer empty */
3080 fsg->data_dir = DATA_DIR_UNKNOWN;
3081 spin_lock_irq(&fsg->lock);
3082 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3083 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3084 fsg->cbbuf_cmnd_size = 0;
3085 spin_unlock_irq(&fsg->lock);
3091 /*-------------------------------------------------------------------------*/
3093 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3094 const struct usb_endpoint_descriptor *d)
3098 ep->driver_data = fsg;
3099 rc = usb_ep_enable(ep, d);
3101 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3105 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3106 struct usb_request **preq)
3108 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3111 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3116 * Reset interface setting and re-init endpoint state (toggle etc).
3117 * Call with altsetting < 0 to disable the interface. The only other
3118 * available altsetting is 0, which enables the interface.
3120 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3124 const struct usb_endpoint_descriptor *d;
3127 DBG(fsg, "reset interface\n");
3130 /* Deallocate the requests */
3131 for (i = 0; i < NUM_BUFFERS; ++i) {
3132 struct fsg_buffhd *bh = &fsg->buffhds[i];
3135 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3139 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3144 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3148 /* Disable the endpoints */
3149 if (fsg->bulk_in_enabled) {
3150 usb_ep_disable(fsg->bulk_in);
3151 fsg->bulk_in_enabled = 0;
3153 if (fsg->bulk_out_enabled) {
3154 usb_ep_disable(fsg->bulk_out);
3155 fsg->bulk_out_enabled = 0;
3157 if (fsg->intr_in_enabled) {
3158 usb_ep_disable(fsg->intr_in);
3159 fsg->intr_in_enabled = 0;
3163 if (altsetting < 0 || rc != 0)
3166 DBG(fsg, "set interface %d\n", altsetting);
3168 /* Enable the endpoints */
3169 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3170 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3172 fsg->bulk_in_enabled = 1;
3174 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3175 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3177 fsg->bulk_out_enabled = 1;
3178 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3179 clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
3181 if (transport_is_cbi()) {
3182 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3183 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3185 fsg->intr_in_enabled = 1;
3188 /* Allocate the requests */
3189 for (i = 0; i < NUM_BUFFERS; ++i) {
3190 struct fsg_buffhd *bh = &fsg->buffhds[i];
3192 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3194 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3196 bh->inreq->buf = bh->outreq->buf = bh->buf;
3197 bh->inreq->context = bh->outreq->context = bh;
3198 bh->inreq->complete = bulk_in_complete;
3199 bh->outreq->complete = bulk_out_complete;
3201 if (transport_is_cbi()) {
3202 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3204 fsg->intreq->complete = intr_in_complete;
3208 for (i = 0; i < fsg->nluns; ++i)
3209 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3215 * Change our operational configuration. This code must agree with the code
3216 * that returns config descriptors, and with interface altsetting code.
3218 * It's also responsible for power management interactions. Some
3219 * configurations might not work with our current power sources.
3220 * For now we just assume the gadget is always self-powered.
3222 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3226 /* Disable the single interface */
3227 if (fsg->config != 0) {
3228 DBG(fsg, "reset config\n");
3230 rc = do_set_interface(fsg, -1);
3233 /* Enable the interface */
3234 if (new_config != 0) {
3235 fsg->config = new_config;
3236 if ((rc = do_set_interface(fsg, 0)) != 0)
3237 fsg->config = 0; // Reset on errors
3241 switch (fsg->gadget->speed) {
3242 case USB_SPEED_LOW: speed = "low"; break;
3243 case USB_SPEED_FULL: speed = "full"; break;
3244 case USB_SPEED_HIGH: speed = "high"; break;
3245 default: speed = "?"; break;
3247 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3254 /*-------------------------------------------------------------------------*/
3256 static void handle_exception(struct fsg_dev *fsg)
3262 struct fsg_buffhd *bh;
3263 enum fsg_state old_state;
3266 unsigned int exception_req_tag;
3269 /* Clear the existing signals. Anything but SIGUSR1 is converted
3270 * into a high-priority EXIT exception. */
3272 sig = dequeue_signal_lock(current, ¤t->blocked, &info);
3275 if (sig != SIGUSR1) {
3276 if (fsg->state < FSG_STATE_EXIT)
3277 DBG(fsg, "Main thread exiting on signal\n");
3278 raise_exception(fsg, FSG_STATE_EXIT);
3282 /* Cancel all the pending transfers */
3283 if (fsg->intreq_busy)
3284 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3285 for (i = 0; i < NUM_BUFFERS; ++i) {
3286 bh = &fsg->buffhds[i];
3288 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3289 if (bh->outreq_busy)
3290 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3293 /* Wait until everything is idle */
3295 num_active = fsg->intreq_busy;
3296 for (i = 0; i < NUM_BUFFERS; ++i) {
3297 bh = &fsg->buffhds[i];
3298 num_active += bh->inreq_busy + bh->outreq_busy;
3300 if (num_active == 0)
3302 if (sleep_thread(fsg))
3306 /* Clear out the controller's fifos */
3307 if (fsg->bulk_in_enabled)
3308 usb_ep_fifo_flush(fsg->bulk_in);
3309 if (fsg->bulk_out_enabled)
3310 usb_ep_fifo_flush(fsg->bulk_out);
3311 if (fsg->intr_in_enabled)
3312 usb_ep_fifo_flush(fsg->intr_in);
3314 /* Reset the I/O buffer states and pointers, the SCSI
3315 * state, and the exception. Then invoke the handler. */
3316 spin_lock_irq(&fsg->lock);
3318 for (i = 0; i < NUM_BUFFERS; ++i) {
3319 bh = &fsg->buffhds[i];
3320 bh->state = BUF_STATE_EMPTY;
3322 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3325 exception_req_tag = fsg->exception_req_tag;
3326 new_config = fsg->new_config;
3327 old_state = fsg->state;
3329 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3330 fsg->state = FSG_STATE_STATUS_PHASE;
3332 for (i = 0; i < fsg->nluns; ++i) {
3333 curlun = &fsg->luns[i];
3334 curlun->prevent_medium_removal = 0;
3335 curlun->sense_data = curlun->unit_attention_data =
3337 curlun->sense_data_info = 0;
3338 curlun->info_valid = 0;
3340 fsg->state = FSG_STATE_IDLE;
3342 spin_unlock_irq(&fsg->lock);
3344 /* Carry out any extra actions required for the exception */
3345 switch (old_state) {
3349 case FSG_STATE_ABORT_BULK_OUT:
3351 spin_lock_irq(&fsg->lock);
3352 if (fsg->state == FSG_STATE_STATUS_PHASE)
3353 fsg->state = FSG_STATE_IDLE;
3354 spin_unlock_irq(&fsg->lock);
3357 case FSG_STATE_RESET:
3358 /* In case we were forced against our will to halt a
3359 * bulk endpoint, clear the halt now. (The SuperH UDC
3360 * requires this.) */
3361 if (test_and_clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
3362 usb_ep_clear_halt(fsg->bulk_in);
3364 if (transport_is_bbb()) {
3365 if (fsg->ep0_req_tag == exception_req_tag)
3366 ep0_queue(fsg); // Complete the status stage
3368 } else if (transport_is_cbi())
3369 send_status(fsg); // Status by interrupt pipe
3371 /* Technically this should go here, but it would only be
3372 * a waste of time. Ditto for the INTERFACE_CHANGE and
3373 * CONFIG_CHANGE cases. */
3374 // for (i = 0; i < fsg->nluns; ++i)
3375 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3378 case FSG_STATE_INTERFACE_CHANGE:
3379 rc = do_set_interface(fsg, 0);
3380 if (fsg->ep0_req_tag != exception_req_tag)
3382 if (rc != 0) // STALL on errors
3383 fsg_set_halt(fsg, fsg->ep0);
3384 else // Complete the status stage
3388 case FSG_STATE_CONFIG_CHANGE:
3389 rc = do_set_config(fsg, new_config);
3390 if (fsg->ep0_req_tag != exception_req_tag)
3392 if (rc != 0) // STALL on errors
3393 fsg_set_halt(fsg, fsg->ep0);
3394 else // Complete the status stage
3398 case FSG_STATE_DISCONNECT:
3400 do_set_config(fsg, 0); // Unconfigured state
3403 case FSG_STATE_EXIT:
3404 case FSG_STATE_TERMINATED:
3405 do_set_config(fsg, 0); // Free resources
3406 spin_lock_irq(&fsg->lock);
3407 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3408 spin_unlock_irq(&fsg->lock);
3414 /*-------------------------------------------------------------------------*/
3416 static int fsg_main_thread(void *fsg_)
3418 struct fsg_dev *fsg = fsg_;
3420 /* Allow the thread to be killed by a signal, but set the signal mask
3421 * to block everything but INT, TERM, KILL, and USR1. */
3422 allow_signal(SIGINT);
3423 allow_signal(SIGTERM);
3424 allow_signal(SIGKILL);
3425 allow_signal(SIGUSR1);
3427 /* Allow the thread to be frozen */
3430 /* Arrange for userspace references to be interpreted as kernel
3431 * pointers. That way we can pass a kernel pointer to a routine
3432 * that expects a __user pointer and it will work okay. */
3436 while (fsg->state != FSG_STATE_TERMINATED) {
3437 if (exception_in_progress(fsg) || signal_pending(current)) {
3438 handle_exception(fsg);
3442 if (!fsg->running) {
3447 if (get_next_command(fsg))
3450 spin_lock_irq(&fsg->lock);
3451 if (!exception_in_progress(fsg))
3452 fsg->state = FSG_STATE_DATA_PHASE;
3453 spin_unlock_irq(&fsg->lock);
3455 if (do_scsi_command(fsg) || finish_reply(fsg))
3458 spin_lock_irq(&fsg->lock);
3459 if (!exception_in_progress(fsg))
3460 fsg->state = FSG_STATE_STATUS_PHASE;
3461 spin_unlock_irq(&fsg->lock);
3463 if (send_status(fsg))
3466 spin_lock_irq(&fsg->lock);
3467 if (!exception_in_progress(fsg))
3468 fsg->state = FSG_STATE_IDLE;
3469 spin_unlock_irq(&fsg->lock);
3472 spin_lock_irq(&fsg->lock);
3473 fsg->thread_task = NULL;
3474 spin_unlock_irq(&fsg->lock);
3476 /* In case we are exiting because of a signal, unregister the
3477 * gadget driver and close the backing file. */
3478 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3479 usb_gadget_unregister_driver(&fsg_driver);
3480 close_all_backing_files(fsg);
3483 /* Let the unbind and cleanup routines know the thread has exited */
3484 complete_and_exit(&fsg->thread_notifier, 0);
3488 /*-------------------------------------------------------------------------*/
3490 /* If the next two routines are called while the gadget is registered,
3491 * the caller must own fsg->filesem for writing. */
3493 static int open_backing_file(struct lun *curlun, const char *filename)
3496 struct file *filp = NULL;
3498 struct inode *inode = NULL;
3502 /* R/W if we can, R/O if we must */
3505 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3506 if (-EROFS == PTR_ERR(filp))
3510 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3512 LINFO(curlun, "unable to open backing file: %s\n", filename);
3513 return PTR_ERR(filp);
3516 if (!(filp->f_mode & FMODE_WRITE))
3519 if (filp->f_path.dentry)
3520 inode = filp->f_path.dentry->d_inode;
3521 if (inode && S_ISBLK(inode->i_mode)) {
3522 if (bdev_read_only(inode->i_bdev))
3524 } else if (!inode || !S_ISREG(inode->i_mode)) {
3525 LINFO(curlun, "invalid file type: %s\n", filename);
3529 /* If we can't read the file, it's no good.
3530 * If we can't write the file, use it read-only. */
3531 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3532 LINFO(curlun, "file not readable: %s\n", filename);
3535 if (!(filp->f_op->write || filp->f_op->aio_write))
3538 size = i_size_read(inode->i_mapping->host);
3540 LINFO(curlun, "unable to find file size: %s\n", filename);
3544 num_sectors = size >> 9; // File size in 512-byte sectors
3545 if (num_sectors == 0) {
3546 LINFO(curlun, "file too small: %s\n", filename);
3553 curlun->filp = filp;
3554 curlun->file_length = size;
3555 curlun->num_sectors = num_sectors;
3556 LDBG(curlun, "open backing file: %s\n", filename);
3560 filp_close(filp, current->files);
3565 static void close_backing_file(struct lun *curlun)
3568 LDBG(curlun, "close backing file\n");
3570 curlun->filp = NULL;
3574 static void close_all_backing_files(struct fsg_dev *fsg)
3578 for (i = 0; i < fsg->nluns; ++i)
3579 close_backing_file(&fsg->luns[i]);
3583 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3585 struct lun *curlun = dev_to_lun(dev);
3587 return sprintf(buf, "%d\n", curlun->ro);
3590 static ssize_t show_file(struct device *dev, struct device_attribute *attr,
3593 struct lun *curlun = dev_to_lun(dev);
3594 struct fsg_dev *fsg = dev_get_drvdata(dev);
3598 down_read(&fsg->filesem);
3599 if (backing_file_is_open(curlun)) { // Get the complete pathname
3600 p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
3605 memmove(buf, p, rc);
3606 buf[rc] = '\n'; // Add a newline
3609 } else { // No file, return 0 bytes
3613 up_read(&fsg->filesem);
3618 static ssize_t store_ro(struct device *dev, struct device_attribute *attr,
3619 const char *buf, size_t count)
3622 struct lun *curlun = dev_to_lun(dev);
3623 struct fsg_dev *fsg = dev_get_drvdata(dev);
3626 if (sscanf(buf, "%d", &i) != 1)
3629 /* Allow the write-enable status to change only while the backing file
3631 down_read(&fsg->filesem);
3632 if (backing_file_is_open(curlun)) {
3633 LDBG(curlun, "read-only status change prevented\n");
3637 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3639 up_read(&fsg->filesem);
3643 static ssize_t store_file(struct device *dev, struct device_attribute *attr,
3644 const char *buf, size_t count)
3646 struct lun *curlun = dev_to_lun(dev);
3647 struct fsg_dev *fsg = dev_get_drvdata(dev);
3650 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3651 LDBG(curlun, "eject attempt prevented\n");
3652 return -EBUSY; // "Door is locked"
3655 /* Remove a trailing newline */
3656 if (count > 0 && buf[count-1] == '\n')
3657 ((char *) buf)[count-1] = 0; // Ugh!
3659 /* Eject current medium */
3660 down_write(&fsg->filesem);
3661 if (backing_file_is_open(curlun)) {
3662 close_backing_file(curlun);
3663 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3666 /* Load new medium */
3667 if (count > 0 && buf[0]) {
3668 rc = open_backing_file(curlun, buf);
3670 curlun->unit_attention_data =
3671 SS_NOT_READY_TO_READY_TRANSITION;
3673 up_write(&fsg->filesem);
3674 return (rc < 0 ? rc : count);
3678 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3679 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3680 static DEVICE_ATTR(file, 0444, show_file, NULL);
3683 /*-------------------------------------------------------------------------*/
3685 static void fsg_release(struct kref *ref)
3687 struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref);
3693 static void lun_release(struct device *dev)
3695 struct fsg_dev *fsg = dev_get_drvdata(dev);
3697 kref_put(&fsg->ref, fsg_release);
3700 static void /* __init_or_exit */ fsg_unbind(struct usb_gadget *gadget)
3702 struct fsg_dev *fsg = get_gadget_data(gadget);
3705 struct usb_request *req = fsg->ep0req;
3707 DBG(fsg, "unbind\n");
3708 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3710 /* Unregister the sysfs attribute files and the LUNs */
3711 for (i = 0; i < fsg->nluns; ++i) {
3712 curlun = &fsg->luns[i];
3713 if (curlun->registered) {
3714 device_remove_file(&curlun->dev, &dev_attr_ro);
3715 device_remove_file(&curlun->dev, &dev_attr_file);
3716 device_unregister(&curlun->dev);
3717 curlun->registered = 0;
3721 /* If the thread isn't already dead, tell it to exit now */
3722 if (fsg->state != FSG_STATE_TERMINATED) {
3723 raise_exception(fsg, FSG_STATE_EXIT);
3724 wait_for_completion(&fsg->thread_notifier);
3726 /* The cleanup routine waits for this completion also */
3727 complete(&fsg->thread_notifier);
3730 /* Free the data buffers */
3731 for (i = 0; i < NUM_BUFFERS; ++i)
3732 kfree(fsg->buffhds[i].buf);
3734 /* Free the request and buffer for endpoint 0 */
3737 usb_ep_free_request(fsg->ep0, req);
3740 set_gadget_data(gadget, NULL);
3744 static int __init check_parameters(struct fsg_dev *fsg)
3749 /* Store the default values */
3750 mod_data.transport_type = USB_PR_BULK;
3751 mod_data.transport_name = "Bulk-only";
3752 mod_data.protocol_type = USB_SC_SCSI;
3753 mod_data.protocol_name = "Transparent SCSI";
3755 if (gadget_is_sh(fsg->gadget))
3756 mod_data.can_stall = 0;
3758 if (mod_data.release == 0xffff) { // Parameter wasn't set
3759 /* The sa1100 controller is not supported */
3760 if (gadget_is_sa1100(fsg->gadget))
3763 gcnum = usb_gadget_controller_number(fsg->gadget);
3765 mod_data.release = 0x0300 + gcnum;
3767 WARNING(fsg, "controller '%s' not recognized\n",
3769 mod_data.release = 0x0399;
3773 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3775 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3776 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3777 ; // Use default setting
3778 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3779 mod_data.transport_type = USB_PR_CB;
3780 mod_data.transport_name = "Control-Bulk";
3781 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3782 mod_data.transport_type = USB_PR_CBI;
3783 mod_data.transport_name = "Control-Bulk-Interrupt";
3785 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3789 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3790 prot == USB_SC_SCSI) {
3791 ; // Use default setting
3792 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3793 prot == USB_SC_RBC) {
3794 mod_data.protocol_type = USB_SC_RBC;
3795 mod_data.protocol_name = "RBC";
3796 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3797 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3798 prot == USB_SC_8020) {
3799 mod_data.protocol_type = USB_SC_8020;
3800 mod_data.protocol_name = "8020i (ATAPI)";
3801 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3802 prot == USB_SC_QIC) {
3803 mod_data.protocol_type = USB_SC_QIC;
3804 mod_data.protocol_name = "QIC-157";
3805 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3806 prot == USB_SC_UFI) {
3807 mod_data.protocol_type = USB_SC_UFI;
3808 mod_data.protocol_name = "UFI";
3809 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3810 prot == USB_SC_8070) {
3811 mod_data.protocol_type = USB_SC_8070;
3812 mod_data.protocol_name = "8070i";
3814 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3818 mod_data.buflen &= PAGE_CACHE_MASK;
3819 if (mod_data.buflen <= 0) {
3820 ERROR(fsg, "invalid buflen\n");
3823 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3829 static int __init fsg_bind(struct usb_gadget *gadget)
3831 struct fsg_dev *fsg = the_fsg;
3836 struct usb_request *req;
3839 fsg->gadget = gadget;
3840 set_gadget_data(gadget, fsg);
3841 fsg->ep0 = gadget->ep0;
3842 fsg->ep0->driver_data = fsg;
3844 if ((rc = check_parameters(fsg)) != 0)
3847 if (mod_data.removable) { // Enable the store_xxx attributes
3848 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3849 dev_attr_ro.store = store_ro;
3850 dev_attr_file.store = store_file;
3853 /* Find out how many LUNs there should be */
3856 i = max(mod_data.num_filenames, 1u);
3858 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3863 /* Create the LUNs, open their backing files, and register the
3864 * LUN devices in sysfs. */
3865 fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
3872 for (i = 0; i < fsg->nluns; ++i) {
3873 curlun = &fsg->luns[i];
3874 curlun->ro = mod_data.ro[i];
3875 curlun->dev.release = lun_release;
3876 curlun->dev.parent = &gadget->dev;
3877 curlun->dev.driver = &fsg_driver.driver;
3878 dev_set_drvdata(&curlun->dev, fsg);
3879 dev_set_name(&curlun->dev,"%s-lun%d",
3880 dev_name(&gadget->dev), i);
3882 if ((rc = device_register(&curlun->dev)) != 0) {
3883 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3886 if ((rc = device_create_file(&curlun->dev,
3887 &dev_attr_ro)) != 0 ||
3888 (rc = device_create_file(&curlun->dev,
3889 &dev_attr_file)) != 0) {
3890 device_unregister(&curlun->dev);
3893 curlun->registered = 1;
3894 kref_get(&fsg->ref);
3896 if (mod_data.file[i] && *mod_data.file[i]) {
3897 if ((rc = open_backing_file(curlun,
3898 mod_data.file[i])) != 0)
3900 } else if (!mod_data.removable) {
3901 ERROR(fsg, "no file given for LUN%d\n", i);
3907 /* Find all the endpoints we will use */
3908 usb_ep_autoconfig_reset(gadget);
3909 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3912 ep->driver_data = fsg; // claim the endpoint
3915 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3918 ep->driver_data = fsg; // claim the endpoint
3921 if (transport_is_cbi()) {
3922 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3925 ep->driver_data = fsg; // claim the endpoint
3929 /* Fix up the descriptors */
3930 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3931 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3932 device_desc.idProduct = cpu_to_le16(mod_data.product);
3933 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3935 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3936 intf_desc.bNumEndpoints = i;
3937 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3938 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3939 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3941 if (gadget_is_dualspeed(gadget)) {
3942 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3944 /* Assume ep0 uses the same maxpacket value for both speeds */
3945 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3947 /* Assume endpoint addresses are the same for both speeds */
3948 hs_bulk_in_desc.bEndpointAddress =
3949 fs_bulk_in_desc.bEndpointAddress;
3950 hs_bulk_out_desc.bEndpointAddress =
3951 fs_bulk_out_desc.bEndpointAddress;
3952 hs_intr_in_desc.bEndpointAddress =
3953 fs_intr_in_desc.bEndpointAddress;
3956 if (gadget_is_otg(gadget))
3957 otg_desc.bmAttributes |= USB_OTG_HNP;
3961 /* Allocate the request and buffer for endpoint 0 */
3962 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3965 req->buf = kmalloc(EP0_BUFSIZE, GFP_KERNEL);
3968 req->complete = ep0_complete;
3970 /* Allocate the data buffers */
3971 for (i = 0; i < NUM_BUFFERS; ++i) {
3972 struct fsg_buffhd *bh = &fsg->buffhds[i];
3974 /* Allocate for the bulk-in endpoint. We assume that
3975 * the buffer will also work with the bulk-out (and
3976 * interrupt-in) endpoint. */
3977 bh->buf = kmalloc(mod_data.buflen, GFP_KERNEL);
3982 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3984 /* This should reflect the actual gadget power source */
3985 usb_gadget_set_selfpowered(gadget);
3987 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3988 init_utsname()->sysname, init_utsname()->release,
3991 /* On a real device, serial[] would be loaded from permanent
3992 * storage. We just encode it from the driver version string. */
3993 for (i = 0; i < sizeof(serial) - 2; i += 2) {
3994 unsigned char c = DRIVER_VERSION[i / 2];
3998 sprintf(&serial[i], "%02X", c);
4001 fsg->thread_task = kthread_create(fsg_main_thread, fsg,
4002 "file-storage-gadget");
4003 if (IS_ERR(fsg->thread_task)) {
4004 rc = PTR_ERR(fsg->thread_task);
4008 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
4009 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
4011 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
4012 for (i = 0; i < fsg->nluns; ++i) {
4013 curlun = &fsg->luns[i];
4014 if (backing_file_is_open(curlun)) {
4017 p = d_path(&curlun->filp->f_path,
4022 LINFO(curlun, "ro=%d, file: %s\n",
4023 curlun->ro, (p ? p : "(error)"));
4028 DBG(fsg, "transport=%s (x%02x)\n",
4029 mod_data.transport_name, mod_data.transport_type);
4030 DBG(fsg, "protocol=%s (x%02x)\n",
4031 mod_data.protocol_name, mod_data.protocol_type);
4032 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
4033 mod_data.vendor, mod_data.product, mod_data.release);
4034 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
4035 mod_data.removable, mod_data.can_stall,
4037 DBG(fsg, "I/O thread pid: %d\n", task_pid_nr(fsg->thread_task));
4039 set_bit(REGISTERED, &fsg->atomic_bitflags);
4041 /* Tell the thread to start working */
4042 wake_up_process(fsg->thread_task);
4046 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4050 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4052 close_all_backing_files(fsg);
4057 /*-------------------------------------------------------------------------*/
4059 static void fsg_suspend(struct usb_gadget *gadget)
4061 struct fsg_dev *fsg = get_gadget_data(gadget);
4063 DBG(fsg, "suspend\n");
4064 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4067 static void fsg_resume(struct usb_gadget *gadget)
4069 struct fsg_dev *fsg = get_gadget_data(gadget);
4071 DBG(fsg, "resume\n");
4072 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4076 /*-------------------------------------------------------------------------*/
4078 static struct usb_gadget_driver fsg_driver = {
4079 #ifdef CONFIG_USB_GADGET_DUALSPEED
4080 .speed = USB_SPEED_HIGH,
4082 .speed = USB_SPEED_FULL,
4084 .function = (char *) longname,
4086 .unbind = fsg_unbind,
4087 .disconnect = fsg_disconnect,
4089 .suspend = fsg_suspend,
4090 .resume = fsg_resume,
4093 .name = (char *) shortname,
4094 .owner = THIS_MODULE,
4102 static int __init fsg_alloc(void)
4104 struct fsg_dev *fsg;
4106 fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
4109 spin_lock_init(&fsg->lock);
4110 init_rwsem(&fsg->filesem);
4111 kref_init(&fsg->ref);
4112 init_completion(&fsg->thread_notifier);
4119 static int __init fsg_init(void)
4122 struct fsg_dev *fsg;
4124 if ((rc = fsg_alloc()) != 0)
4127 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0)
4128 kref_put(&fsg->ref, fsg_release);
4131 module_init(fsg_init);
4134 static void __exit fsg_cleanup(void)
4136 struct fsg_dev *fsg = the_fsg;
4138 /* Unregister the driver iff the thread hasn't already done so */
4139 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4140 usb_gadget_unregister_driver(&fsg_driver);
4142 /* Wait for the thread to finish up */
4143 wait_for_completion(&fsg->thread_notifier);
4145 close_all_backing_files(fsg);
4146 kref_put(&fsg->ref, fsg_release);
4148 module_exit(fsg_cleanup);
projects / linux-2.6-omap-h63xx.git / blob