2 * file_storage.c -- File-backed USB Storage Gadget, for USB development
4 * Copyright (C) 2003-2005 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.
76 * file=filename[,filename...]
77 * Required if "removable" is not set, names of
78 * the files or block devices used for
80 * ro=b[,b...] Default false, booleans for read-only access
81 * removable Default false, boolean for removable media
82 * luns=N Default N = number of filenames, number of
84 * stall Default determined according to the type of
85 * USB device controller (usually true),
86 * boolean to permit the driver to halt
88 * transport=XXX Default BBB, transport name (CB, CBI, or BBB)
89 * protocol=YYY Default SCSI, protocol name (RBC, 8020 or
90 * ATAPI, QIC, UFI, 8070, or SCSI;
92 * vendor=0xVVVV Default 0x0525 (NetChip), USB Vendor ID
93 * product=0xPPPP Default 0xa4a5 (FSG), USB Product ID
94 * release=0xRRRR Override the USB release number (bcdDevice)
95 * buflen=N Default N=16384, buffer size used (will be
96 * rounded down to a multiple of
99 * If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
100 * "removable", "luns", and "stall" options are available; default values
101 * are used for everything else.
103 * The pathnames of the backing files and the ro settings are available in
104 * the attribute files "file" and "ro" in the lun<n> subdirectory of the
105 * gadget's sysfs directory. If the "removable" option is set, writing to
106 * these files will simulate ejecting/loading the medium (writing an empty
107 * line means eject) and adjusting a write-enable tab. Changes to the ro
108 * setting are not allowed when the medium is loaded.
110 * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
117 * The FSG driver is fairly straightforward. There is a main kernel
118 * thread that handles most of the work. Interrupt routines field
119 * callbacks from the controller driver: bulk- and interrupt-request
120 * completion notifications, endpoint-0 events, and disconnect events.
121 * Completion events are passed to the main thread by wakeup calls. Many
122 * ep0 requests are handled at interrupt time, but SetInterface,
123 * SetConfiguration, and device reset requests are forwarded to the
124 * thread in the form of "exceptions" using SIGUSR1 signals (since they
125 * should interrupt any ongoing file I/O operations).
127 * The thread's main routine implements the standard command/data/status
128 * parts of a SCSI interaction. It and its subroutines are full of tests
129 * for pending signals/exceptions -- all this polling is necessary since
130 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
131 * indication that the driver really wants to be running in userspace.)
132 * An important point is that so long as the thread is alive it keeps an
133 * open reference to the backing file. This will prevent unmounting
134 * the backing file's underlying filesystem and could cause problems
135 * during system shutdown, for example. To prevent such problems, the
136 * thread catches INT, TERM, and KILL signals and converts them into
139 * In normal operation the main thread is started during the gadget's
140 * fsg_bind() callback and stopped during fsg_unbind(). But it can also
141 * exit when it receives a signal, and there's no point leaving the
142 * gadget running when the thread is dead. So just before the thread
143 * exits, it deregisters the gadget driver. This makes things a little
144 * tricky: The driver is deregistered at two places, and the exiting
145 * thread can indirectly call fsg_unbind() which in turn can tell the
146 * thread to exit. The first problem is resolved through the use of the
147 * REGISTERED atomic bitflag; the driver will only be deregistered once.
148 * The second problem is resolved by having fsg_unbind() check
149 * fsg->state; it won't try to stop the thread if the state is already
150 * FSG_STATE_TERMINATED.
152 * To provide maximum throughput, the driver uses a circular pipeline of
153 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
154 * arbitrarily long; in practice the benefits don't justify having more
155 * than 2 stages (i.e., double buffering). But it helps to think of the
156 * pipeline as being a long one. Each buffer head contains a bulk-in and
157 * a bulk-out request pointer (since the buffer can be used for both
158 * output and input -- directions always are given from the host's
159 * point of view) as well as a pointer to the buffer and various state
162 * Use of the pipeline follows a simple protocol. There is a variable
163 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
164 * At any time that buffer head may still be in use from an earlier
165 * request, so each buffer head has a state variable indicating whether
166 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
167 * buffer head to be EMPTY, filling the buffer either by file I/O or by
168 * USB I/O (during which the buffer head is BUSY), and marking the buffer
169 * head FULL when the I/O is complete. Then the buffer will be emptied
170 * (again possibly by USB I/O, during which it is marked BUSY) and
171 * finally marked EMPTY again (possibly by a completion routine).
173 * A module parameter tells the driver to avoid stalling the bulk
174 * endpoints wherever the transport specification allows. This is
175 * necessary for some UDCs like the SuperH, which cannot reliably clear a
176 * halt on a bulk endpoint. However, under certain circumstances the
177 * Bulk-only specification requires a stall. In such cases the driver
178 * will halt the endpoint and set a flag indicating that it should clear
179 * the halt in software during the next device reset. Hopefully this
180 * will permit everything to work correctly. Furthermore, although the
181 * specification allows the bulk-out endpoint to halt when the host sends
182 * too much data, implementing this would cause an unavoidable race.
183 * The driver will always use the "no-stall" approach for OUT transfers.
185 * One subtle point concerns sending status-stage responses for ep0
186 * requests. Some of these requests, such as device reset, can involve
187 * interrupting an ongoing file I/O operation, which might take an
188 * arbitrarily long time. During that delay the host might give up on
189 * the original ep0 request and issue a new one. When that happens the
190 * driver should not notify the host about completion of the original
191 * request, as the host will no longer be waiting for it. So the driver
192 * assigns to each ep0 request a unique tag, and it keeps track of the
193 * tag value of the request associated with a long-running exception
194 * (device-reset, interface-change, or configuration-change). When the
195 * exception handler is finished, the status-stage response is submitted
196 * only if the current ep0 request tag is equal to the exception request
197 * tag. Thus only the most recently received ep0 request will get a
198 * status-stage response.
200 * Warning: This driver source file is too long. It ought to be split up
201 * into a header file plus about 3 separate .c files, to handle the details
202 * of the Gadget, USB Mass Storage, and SCSI protocols.
210 #include <linux/config.h>
212 #include <asm/system.h>
213 #include <asm/uaccess.h>
215 #include <linux/bitops.h>
216 #include <linux/blkdev.h>
217 #include <linux/compiler.h>
218 #include <linux/completion.h>
219 #include <linux/dcache.h>
220 #include <linux/delay.h>
221 #include <linux/device.h>
222 #include <linux/fcntl.h>
223 #include <linux/file.h>
224 #include <linux/fs.h>
225 #include <linux/init.h>
226 #include <linux/kernel.h>
227 #include <linux/kthread.h>
228 #include <linux/limits.h>
229 #include <linux/list.h>
230 #include <linux/module.h>
231 #include <linux/moduleparam.h>
232 #include <linux/pagemap.h>
233 #include <linux/rwsem.h>
234 #include <linux/sched.h>
235 #include <linux/signal.h>
236 #include <linux/slab.h>
237 #include <linux/spinlock.h>
238 #include <linux/string.h>
239 #include <linux/suspend.h>
240 #include <linux/utsname.h>
241 #include <linux/wait.h>
243 #include <linux/usb_ch9.h>
244 #include <linux/usb_gadget.h>
246 #include "gadget_chips.h"
249 /*-------------------------------------------------------------------------*/
251 #define DRIVER_DESC "File-backed Storage Gadget"
252 #define DRIVER_NAME "g_file_storage"
253 #define DRIVER_VERSION "20 October 2004"
255 static const char longname[] = DRIVER_DESC;
256 static const char shortname[] = DRIVER_NAME;
258 MODULE_DESCRIPTION(DRIVER_DESC);
259 MODULE_AUTHOR("Alan Stern");
260 MODULE_LICENSE("Dual BSD/GPL");
262 /* Thanks to NetChip Technologies for donating this product ID.
264 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
265 * Instead: allocate your own, using normal USB-IF procedures. */
266 #define DRIVER_VENDOR_ID 0x0525 // NetChip
267 #define DRIVER_PRODUCT_ID 0xa4a5 // Linux-USB File-backed Storage Gadget
271 * This driver assumes self-powered hardware and has no way for users to
272 * trigger remote wakeup. It uses autoconfiguration to select endpoints
273 * and endpoint addresses.
277 /*-------------------------------------------------------------------------*/
279 #define xprintk(f,level,fmt,args...) \
280 dev_printk(level , &(f)->gadget->dev , fmt , ## args)
281 #define yprintk(l,level,fmt,args...) \
282 dev_printk(level , &(l)->dev , fmt , ## args)
285 #define DBG(fsg,fmt,args...) \
286 xprintk(fsg , KERN_DEBUG , fmt , ## args)
287 #define LDBG(lun,fmt,args...) \
288 yprintk(lun , KERN_DEBUG , fmt , ## args)
289 #define MDBG(fmt,args...) \
290 printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args)
292 #define DBG(fsg,fmt,args...) \
294 #define LDBG(lun,fmt,args...) \
296 #define MDBG(fmt,args...) \
306 #define VDBG(fsg,fmt,args...) \
308 #define VLDBG(lun,fmt,args...) \
312 #define ERROR(fsg,fmt,args...) \
313 xprintk(fsg , KERN_ERR , fmt , ## args)
314 #define LERROR(lun,fmt,args...) \
315 yprintk(lun , KERN_ERR , fmt , ## args)
317 #define WARN(fsg,fmt,args...) \
318 xprintk(fsg , KERN_WARNING , fmt , ## args)
319 #define LWARN(lun,fmt,args...) \
320 yprintk(lun , KERN_WARNING , fmt , ## args)
322 #define INFO(fsg,fmt,args...) \
323 xprintk(fsg , KERN_INFO , fmt , ## args)
324 #define LINFO(lun,fmt,args...) \
325 yprintk(lun , KERN_INFO , fmt , ## args)
327 #define MINFO(fmt,args...) \
328 printk(KERN_INFO DRIVER_NAME ": " fmt , ## args)
331 /*-------------------------------------------------------------------------*/
333 /* Encapsulate the module parameter settings */
337 /* Arggh! There should be a module_param_array_named macro! */
338 static char *file[MAX_LUNS] = {NULL, };
339 static int ro[MAX_LUNS] = {0, };
349 char *transport_parm;
351 unsigned short vendor;
352 unsigned short product;
353 unsigned short release;
357 char *transport_name;
361 } mod_data = { // Default values
362 .transport_parm = "BBB",
363 .protocol_parm = "SCSI",
366 .vendor = DRIVER_VENDOR_ID,
367 .product = DRIVER_PRODUCT_ID,
368 .release = 0xffff, // Use controller chip type
373 module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
374 MODULE_PARM_DESC(file, "names of backing files or devices");
376 module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
377 MODULE_PARM_DESC(ro, "true to force read-only");
379 module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
380 MODULE_PARM_DESC(luns, "number of LUNs");
382 module_param_named(removable, mod_data.removable, bool, S_IRUGO);
383 MODULE_PARM_DESC(removable, "true to simulate removable media");
385 module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
386 MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
389 /* In the non-TEST version, only the module parameters listed above
391 #ifdef CONFIG_USB_FILE_STORAGE_TEST
393 module_param_named(transport, mod_data.transport_parm, charp, S_IRUGO);
394 MODULE_PARM_DESC(transport, "type of transport (BBB, CBI, or CB)");
396 module_param_named(protocol, mod_data.protocol_parm, charp, S_IRUGO);
397 MODULE_PARM_DESC(protocol, "type of protocol (RBC, 8020, QIC, UFI, "
400 module_param_named(vendor, mod_data.vendor, ushort, S_IRUGO);
401 MODULE_PARM_DESC(vendor, "USB Vendor ID");
403 module_param_named(product, mod_data.product, ushort, S_IRUGO);
404 MODULE_PARM_DESC(product, "USB Product ID");
406 module_param_named(release, mod_data.release, ushort, S_IRUGO);
407 MODULE_PARM_DESC(release, "USB release number");
409 module_param_named(buflen, mod_data.buflen, uint, S_IRUGO);
410 MODULE_PARM_DESC(buflen, "I/O buffer size");
412 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
415 /*-------------------------------------------------------------------------*/
417 /* USB protocol value = the transport method */
418 #define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
419 #define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
420 #define USB_PR_BULK 0x50 // Bulk-only
422 /* USB subclass value = the protocol encapsulation */
423 #define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
424 #define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
425 #define USB_SC_QIC 0x03 // QIC-157 (tape)
426 #define USB_SC_UFI 0x04 // UFI (floppy)
427 #define USB_SC_8070 0x05 // SFF-8070i (removable)
428 #define USB_SC_SCSI 0x06 // Transparent SCSI
430 /* Bulk-only data structures */
432 /* Command Block Wrapper */
433 struct bulk_cb_wrap {
434 __le32 Signature; // Contains 'USBC'
435 u32 Tag; // Unique per command id
436 __le32 DataTransferLength; // Size of the data
437 u8 Flags; // Direction in bit 7
438 u8 Lun; // LUN (normally 0)
439 u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
440 u8 CDB[16]; // Command Data Block
443 #define USB_BULK_CB_WRAP_LEN 31
444 #define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
445 #define USB_BULK_IN_FLAG 0x80
447 /* Command Status Wrapper */
448 struct bulk_cs_wrap {
449 __le32 Signature; // Should = 'USBS'
450 u32 Tag; // Same as original command
451 __le32 Residue; // Amount not transferred
452 u8 Status; // See below
455 #define USB_BULK_CS_WRAP_LEN 13
456 #define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
457 #define USB_STATUS_PASS 0
458 #define USB_STATUS_FAIL 1
459 #define USB_STATUS_PHASE_ERROR 2
461 /* Bulk-only class specific requests */
462 #define USB_BULK_RESET_REQUEST 0xff
463 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
466 /* CBI Interrupt data structure */
467 struct interrupt_data {
472 #define CBI_INTERRUPT_DATA_LEN 2
474 /* CBI Accept Device-Specific Command request */
475 #define USB_CBI_ADSC_REQUEST 0x00
478 #define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
480 /* SCSI commands that we recognize */
481 #define SC_FORMAT_UNIT 0x04
482 #define SC_INQUIRY 0x12
483 #define SC_MODE_SELECT_6 0x15
484 #define SC_MODE_SELECT_10 0x55
485 #define SC_MODE_SENSE_6 0x1a
486 #define SC_MODE_SENSE_10 0x5a
487 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
488 #define SC_READ_6 0x08
489 #define SC_READ_10 0x28
490 #define SC_READ_12 0xa8
491 #define SC_READ_CAPACITY 0x25
492 #define SC_READ_FORMAT_CAPACITIES 0x23
493 #define SC_RELEASE 0x17
494 #define SC_REQUEST_SENSE 0x03
495 #define SC_RESERVE 0x16
496 #define SC_SEND_DIAGNOSTIC 0x1d
497 #define SC_START_STOP_UNIT 0x1b
498 #define SC_SYNCHRONIZE_CACHE 0x35
499 #define SC_TEST_UNIT_READY 0x00
500 #define SC_VERIFY 0x2f
501 #define SC_WRITE_6 0x0a
502 #define SC_WRITE_10 0x2a
503 #define SC_WRITE_12 0xaa
505 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
506 #define SS_NO_SENSE 0
507 #define SS_COMMUNICATION_FAILURE 0x040800
508 #define SS_INVALID_COMMAND 0x052000
509 #define SS_INVALID_FIELD_IN_CDB 0x052400
510 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
511 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
512 #define SS_MEDIUM_NOT_PRESENT 0x023a00
513 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
514 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800
515 #define SS_RESET_OCCURRED 0x062900
516 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
517 #define SS_UNRECOVERED_READ_ERROR 0x031100
518 #define SS_WRITE_ERROR 0x030c02
519 #define SS_WRITE_PROTECTED 0x072700
521 #define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
522 #define ASC(x) ((u8) ((x) >> 8))
523 #define ASCQ(x) ((u8) (x))
526 /*-------------------------------------------------------------------------*/
529 * These definitions will permit the compiler to avoid generating code for
530 * parts of the driver that aren't used in the non-TEST version. Even gcc
531 * can recognize when a test of a constant expression yields a dead code
535 #ifdef CONFIG_USB_FILE_STORAGE_TEST
537 #define transport_is_bbb() (mod_data.transport_type == USB_PR_BULK)
538 #define transport_is_cbi() (mod_data.transport_type == USB_PR_CBI)
539 #define protocol_is_scsi() (mod_data.protocol_type == USB_SC_SCSI)
543 #define transport_is_bbb() 1
544 #define transport_is_cbi() 0
545 #define protocol_is_scsi() 1
547 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
556 unsigned int prevent_medium_removal : 1;
557 unsigned int registered : 1;
561 u32 unit_attention_data;
566 #define backing_file_is_open(curlun) ((curlun)->filp != NULL)
568 static inline struct lun *dev_to_lun(struct device *dev)
570 return container_of(dev, struct lun, dev);
574 /* Big enough to hold our biggest descriptor */
575 #define EP0_BUFSIZE 256
576 #define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
578 /* Number of buffers we will use. 2 is enough for double-buffering */
579 #define NUM_BUFFERS 2
581 enum fsg_buffer_state {
590 volatile enum fsg_buffer_state state;
591 struct fsg_buffhd *next;
593 /* The NetChip 2280 is faster, and handles some protocol faults
594 * better, if we don't submit any short bulk-out read requests.
595 * So we will record the intended request length here. */
596 unsigned int bulk_out_intended_length;
598 struct usb_request *inreq;
599 volatile int inreq_busy;
600 struct usb_request *outreq;
601 volatile int outreq_busy;
605 FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
606 FSG_STATE_DATA_PHASE,
607 FSG_STATE_STATUS_PHASE,
610 FSG_STATE_ABORT_BULK_OUT,
612 FSG_STATE_INTERFACE_CHANGE,
613 FSG_STATE_CONFIG_CHANGE,
614 FSG_STATE_DISCONNECT,
619 enum data_direction {
620 DATA_DIR_UNKNOWN = 0,
627 /* lock protects: state, all the req_busy's, and cbbuf_cmnd */
629 struct usb_gadget *gadget;
631 /* filesem protects: backing files in use */
632 struct rw_semaphore filesem;
634 struct usb_ep *ep0; // Handy copy of gadget->ep0
635 struct usb_request *ep0req; // For control responses
636 volatile unsigned int ep0_req_tag;
637 const char *ep0req_name;
639 struct usb_request *intreq; // For interrupt responses
640 volatile int intreq_busy;
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 CLEAR_BULK_HALTS 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 wait_queue_head_t thread_wqh;
671 int thread_wakeup_needed;
672 struct completion thread_notifier;
673 struct task_struct *thread_task;
674 sigset_t thread_signal_mask;
677 u8 cmnd[MAX_COMMAND_SIZE];
678 enum data_direction data_dir;
680 u32 data_size_from_cmnd;
686 /* The CB protocol offers no way for a host to know when a command
687 * has completed. As a result the next command may arrive early,
688 * and we will still have to handle it. For that reason we need
689 * a buffer to store new commands when using CB (or CBI, which
690 * does not oblige a host to wait for command completion either). */
692 u8 cbbuf_cmnd[MAX_COMMAND_SIZE];
697 struct completion lun_released;
700 typedef void (*fsg_routine_t)(struct fsg_dev *);
702 static int inline exception_in_progress(struct fsg_dev *fsg)
704 return (fsg->state > FSG_STATE_IDLE);
707 /* Make bulk-out requests be divisible by the maxpacket size */
708 static void inline set_bulk_out_req_length(struct fsg_dev *fsg,
709 struct fsg_buffhd *bh, unsigned int length)
713 bh->bulk_out_intended_length = length;
714 rem = length % fsg->bulk_out_maxpacket;
716 length += fsg->bulk_out_maxpacket - rem;
717 bh->outreq->length = length;
720 static struct fsg_dev *the_fsg;
721 static struct usb_gadget_driver fsg_driver;
723 static void close_backing_file(struct lun *curlun);
724 static void close_all_backing_files(struct fsg_dev *fsg);
727 /*-------------------------------------------------------------------------*/
731 static void dump_msg(struct fsg_dev *fsg, const char *label,
732 const u8 *buf, unsigned int length)
734 unsigned int start, num, i;
739 DBG(fsg, "%s, length %u:\n", label, length);
743 num = min(length, 16u);
745 for (i = 0; i < num; ++i) {
748 sprintf(p, " %02x", buf[i]);
752 printk(KERN_DEBUG "%6x: %s\n", start, line);
759 static void inline dump_cdb(struct fsg_dev *fsg)
764 static void inline dump_msg(struct fsg_dev *fsg, const char *label,
765 const u8 *buf, unsigned int length)
768 static void inline dump_cdb(struct fsg_dev *fsg)
771 char cmdbuf[3*MAX_COMMAND_SIZE + 1];
773 for (i = 0; i < fsg->cmnd_size; ++i)
774 sprintf(cmdbuf + i*3, " %02x", fsg->cmnd[i]);
775 VDBG(fsg, "SCSI CDB: %s\n", cmdbuf);
778 #endif /* DUMP_MSGS */
781 static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
785 if (ep == fsg->bulk_in)
787 else if (ep == fsg->bulk_out)
791 DBG(fsg, "%s set halt\n", name);
792 return usb_ep_set_halt(ep);
796 /*-------------------------------------------------------------------------*/
798 /* Routines for unaligned data access */
800 static u16 inline get_be16(u8 *buf)
802 return ((u16) buf[0] << 8) | ((u16) buf[1]);
805 static u32 inline get_be32(u8 *buf)
807 return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
808 ((u32) buf[2] << 8) | ((u32) buf[3]);
811 static void inline put_be16(u8 *buf, u16 val)
817 static void inline put_be32(u8 *buf, u32 val)
826 /*-------------------------------------------------------------------------*/
829 * DESCRIPTORS ... most are static, but strings and (full) configuration
830 * descriptors are built on demand. Also the (static) config and interface
831 * descriptors are adjusted during fsg_bind().
833 #define STRING_MANUFACTURER 1
834 #define STRING_PRODUCT 2
835 #define STRING_SERIAL 3
836 #define STRING_CONFIG 4
837 #define STRING_INTERFACE 5
839 /* There is only one configuration. */
840 #define CONFIG_VALUE 1
842 static struct usb_device_descriptor
844 .bLength = sizeof device_desc,
845 .bDescriptorType = USB_DT_DEVICE,
847 .bcdUSB = __constant_cpu_to_le16(0x0200),
848 .bDeviceClass = USB_CLASS_PER_INTERFACE,
850 /* The next three values can be overridden by module parameters */
851 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
852 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
853 .bcdDevice = __constant_cpu_to_le16(0xffff),
855 .iManufacturer = STRING_MANUFACTURER,
856 .iProduct = STRING_PRODUCT,
857 .iSerialNumber = STRING_SERIAL,
858 .bNumConfigurations = 1,
861 static struct usb_config_descriptor
863 .bLength = sizeof config_desc,
864 .bDescriptorType = USB_DT_CONFIG,
866 /* wTotalLength computed by usb_gadget_config_buf() */
868 .bConfigurationValue = CONFIG_VALUE,
869 .iConfiguration = STRING_CONFIG,
870 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
871 .bMaxPower = 1, // self-powered
874 static struct usb_otg_descriptor
876 .bLength = sizeof(otg_desc),
877 .bDescriptorType = USB_DT_OTG,
879 .bmAttributes = USB_OTG_SRP,
882 /* There is only one interface. */
884 static struct usb_interface_descriptor
886 .bLength = sizeof intf_desc,
887 .bDescriptorType = USB_DT_INTERFACE,
889 .bNumEndpoints = 2, // Adjusted during fsg_bind()
890 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
891 .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
892 .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
893 .iInterface = STRING_INTERFACE,
896 /* Three full-speed endpoint descriptors: bulk-in, bulk-out,
897 * and interrupt-in. */
899 static struct usb_endpoint_descriptor
901 .bLength = USB_DT_ENDPOINT_SIZE,
902 .bDescriptorType = USB_DT_ENDPOINT,
904 .bEndpointAddress = USB_DIR_IN,
905 .bmAttributes = USB_ENDPOINT_XFER_BULK,
906 /* wMaxPacketSize set by autoconfiguration */
909 static struct usb_endpoint_descriptor
911 .bLength = USB_DT_ENDPOINT_SIZE,
912 .bDescriptorType = USB_DT_ENDPOINT,
914 .bEndpointAddress = USB_DIR_OUT,
915 .bmAttributes = USB_ENDPOINT_XFER_BULK,
916 /* wMaxPacketSize set by autoconfiguration */
919 static struct usb_endpoint_descriptor
921 .bLength = USB_DT_ENDPOINT_SIZE,
922 .bDescriptorType = USB_DT_ENDPOINT,
924 .bEndpointAddress = USB_DIR_IN,
925 .bmAttributes = USB_ENDPOINT_XFER_INT,
926 .wMaxPacketSize = __constant_cpu_to_le16(2),
927 .bInterval = 32, // frames -> 32 ms
930 static const struct usb_descriptor_header *fs_function[] = {
931 (struct usb_descriptor_header *) &otg_desc,
932 (struct usb_descriptor_header *) &intf_desc,
933 (struct usb_descriptor_header *) &fs_bulk_in_desc,
934 (struct usb_descriptor_header *) &fs_bulk_out_desc,
935 (struct usb_descriptor_header *) &fs_intr_in_desc,
938 #define FS_FUNCTION_PRE_EP_ENTRIES 2
941 #ifdef CONFIG_USB_GADGET_DUALSPEED
944 * USB 2.0 devices need to expose both high speed and full speed
945 * descriptors, unless they only run at full speed.
947 * That means alternate endpoint descriptors (bigger packets)
948 * and a "device qualifier" ... plus more construction options
949 * for the config descriptor.
951 static struct usb_qualifier_descriptor
953 .bLength = sizeof dev_qualifier,
954 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
956 .bcdUSB = __constant_cpu_to_le16(0x0200),
957 .bDeviceClass = USB_CLASS_PER_INTERFACE,
959 .bNumConfigurations = 1,
962 static struct usb_endpoint_descriptor
964 .bLength = USB_DT_ENDPOINT_SIZE,
965 .bDescriptorType = USB_DT_ENDPOINT,
967 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
968 .bmAttributes = USB_ENDPOINT_XFER_BULK,
969 .wMaxPacketSize = __constant_cpu_to_le16(512),
972 static struct usb_endpoint_descriptor
974 .bLength = USB_DT_ENDPOINT_SIZE,
975 .bDescriptorType = USB_DT_ENDPOINT,
977 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
978 .bmAttributes = USB_ENDPOINT_XFER_BULK,
979 .wMaxPacketSize = __constant_cpu_to_le16(512),
980 .bInterval = 1, // NAK every 1 uframe
983 static struct usb_endpoint_descriptor
985 .bLength = USB_DT_ENDPOINT_SIZE,
986 .bDescriptorType = USB_DT_ENDPOINT,
988 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
989 .bmAttributes = USB_ENDPOINT_XFER_INT,
990 .wMaxPacketSize = __constant_cpu_to_le16(2),
991 .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
994 static const struct usb_descriptor_header *hs_function[] = {
995 (struct usb_descriptor_header *) &otg_desc,
996 (struct usb_descriptor_header *) &intf_desc,
997 (struct usb_descriptor_header *) &hs_bulk_in_desc,
998 (struct usb_descriptor_header *) &hs_bulk_out_desc,
999 (struct usb_descriptor_header *) &hs_intr_in_desc,
1002 #define HS_FUNCTION_PRE_EP_ENTRIES 2
1004 /* Maxpacket and other transfer characteristics vary by speed. */
1005 #define ep_desc(g,fs,hs) (((g)->speed==USB_SPEED_HIGH) ? (hs) : (fs))
1009 /* If there's no high speed support, always use the full-speed descriptor. */
1010 #define ep_desc(g,fs,hs) fs
1012 #endif /* !CONFIG_USB_GADGET_DUALSPEED */
1015 /* The CBI specification limits the serial string to 12 uppercase hexadecimal
1017 static char manufacturer[64];
1018 static char serial[13];
1020 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
1021 static struct usb_string strings[] = {
1022 {STRING_MANUFACTURER, manufacturer},
1023 {STRING_PRODUCT, longname},
1024 {STRING_SERIAL, serial},
1025 {STRING_CONFIG, "Self-powered"},
1026 {STRING_INTERFACE, "Mass Storage"},
1030 static struct usb_gadget_strings stringtab = {
1031 .language = 0x0409, // en-us
1037 * Config descriptors must agree with the code that sets configurations
1038 * and with code managing interfaces and their altsettings. They must
1039 * also handle different speeds and other-speed requests.
1041 static int populate_config_buf(struct usb_gadget *gadget,
1042 u8 *buf, u8 type, unsigned index)
1044 #ifdef CONFIG_USB_GADGET_DUALSPEED
1045 enum usb_device_speed speed = gadget->speed;
1048 const struct usb_descriptor_header **function;
1053 #ifdef CONFIG_USB_GADGET_DUALSPEED
1054 if (type == USB_DT_OTHER_SPEED_CONFIG)
1055 speed = (USB_SPEED_FULL + USB_SPEED_HIGH) - speed;
1056 if (speed == USB_SPEED_HIGH)
1057 function = hs_function;
1060 function = fs_function;
1062 /* for now, don't advertise srp-only devices */
1063 if (!gadget->is_otg)
1066 len = usb_gadget_config_buf(&config_desc, buf, EP0_BUFSIZE, function);
1067 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1072 /*-------------------------------------------------------------------------*/
1074 /* These routines may be called in process context or in_irq */
1076 static void wakeup_thread(struct fsg_dev *fsg)
1078 /* Tell the main thread that something has happened */
1079 fsg->thread_wakeup_needed = 1;
1080 wake_up_all(&fsg->thread_wqh);
1084 static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
1086 unsigned long flags;
1088 /* Do nothing if a higher-priority exception is already in progress.
1089 * If a lower-or-equal priority exception is in progress, preempt it
1090 * and notify the main thread by sending it a signal. */
1091 spin_lock_irqsave(&fsg->lock, flags);
1092 if (fsg->state <= new_state) {
1093 fsg->exception_req_tag = fsg->ep0_req_tag;
1094 fsg->state = new_state;
1095 if (fsg->thread_task)
1096 send_sig_info(SIGUSR1, SEND_SIG_FORCED,
1099 spin_unlock_irqrestore(&fsg->lock, flags);
1103 /*-------------------------------------------------------------------------*/
1105 /* The disconnect callback and ep0 routines. These always run in_irq,
1106 * except that ep0_queue() is called in the main thread to acknowledge
1107 * completion of various requests: set config, set interface, and
1108 * Bulk-only device reset. */
1110 static void fsg_disconnect(struct usb_gadget *gadget)
1112 struct fsg_dev *fsg = get_gadget_data(gadget);
1114 DBG(fsg, "disconnect or port reset\n");
1115 raise_exception(fsg, FSG_STATE_DISCONNECT);
1119 static int ep0_queue(struct fsg_dev *fsg)
1123 rc = usb_ep_queue(fsg->ep0, fsg->ep0req, GFP_ATOMIC);
1124 if (rc != 0 && rc != -ESHUTDOWN) {
1126 /* We can't do much more than wait for a reset */
1127 WARN(fsg, "error in submission: %s --> %d\n",
1128 fsg->ep0->name, rc);
1133 static void ep0_complete(struct usb_ep *ep, struct usb_request *req)
1135 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1137 if (req->actual > 0)
1138 dump_msg(fsg, fsg->ep0req_name, req->buf, req->actual);
1139 if (req->status || req->actual != req->length)
1140 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1141 req->status, req->actual, req->length);
1142 if (req->status == -ECONNRESET) // Request was cancelled
1143 usb_ep_fifo_flush(ep);
1145 if (req->status == 0 && req->context)
1146 ((fsg_routine_t) (req->context))(fsg);
1150 /*-------------------------------------------------------------------------*/
1152 /* Bulk and interrupt endpoint completion handlers.
1153 * These always run in_irq. */
1155 static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
1157 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1158 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1160 if (req->status || req->actual != req->length)
1161 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1162 req->status, req->actual, req->length);
1163 if (req->status == -ECONNRESET) // Request was cancelled
1164 usb_ep_fifo_flush(ep);
1166 /* Hold the lock while we update the request and buffer states */
1167 spin_lock(&fsg->lock);
1169 bh->state = BUF_STATE_EMPTY;
1170 spin_unlock(&fsg->lock);
1174 static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
1176 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1177 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1179 dump_msg(fsg, "bulk-out", req->buf, req->actual);
1180 if (req->status || req->actual != bh->bulk_out_intended_length)
1181 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1182 req->status, req->actual,
1183 bh->bulk_out_intended_length);
1184 if (req->status == -ECONNRESET) // Request was cancelled
1185 usb_ep_fifo_flush(ep);
1187 /* Hold the lock while we update the request and buffer states */
1188 spin_lock(&fsg->lock);
1189 bh->outreq_busy = 0;
1190 bh->state = BUF_STATE_FULL;
1191 spin_unlock(&fsg->lock);
1196 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1197 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1199 struct fsg_dev *fsg = (struct fsg_dev *) ep->driver_data;
1200 struct fsg_buffhd *bh = (struct fsg_buffhd *) req->context;
1202 if (req->status || req->actual != req->length)
1203 DBG(fsg, "%s --> %d, %u/%u\n", __FUNCTION__,
1204 req->status, req->actual, req->length);
1205 if (req->status == -ECONNRESET) // Request was cancelled
1206 usb_ep_fifo_flush(ep);
1208 /* Hold the lock while we update the request and buffer states */
1209 spin_lock(&fsg->lock);
1210 fsg->intreq_busy = 0;
1211 bh->state = BUF_STATE_EMPTY;
1212 spin_unlock(&fsg->lock);
1217 static void intr_in_complete(struct usb_ep *ep, struct usb_request *req)
1219 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1222 /*-------------------------------------------------------------------------*/
1224 /* Ep0 class-specific handlers. These always run in_irq. */
1226 #ifdef CONFIG_USB_FILE_STORAGE_TEST
1227 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1229 struct usb_request *req = fsg->ep0req;
1230 static u8 cbi_reset_cmnd[6] = {
1231 SC_SEND_DIAGNOSTIC, 4, 0xff, 0xff, 0xff, 0xff};
1233 /* Error in command transfer? */
1234 if (req->status || req->length != req->actual ||
1235 req->actual < 6 || req->actual > MAX_COMMAND_SIZE) {
1237 /* Not all controllers allow a protocol stall after
1238 * receiving control-out data, but we'll try anyway. */
1239 fsg_set_halt(fsg, fsg->ep0);
1240 return; // Wait for reset
1243 /* Is it the special reset command? */
1244 if (req->actual >= sizeof cbi_reset_cmnd &&
1245 memcmp(req->buf, cbi_reset_cmnd,
1246 sizeof cbi_reset_cmnd) == 0) {
1248 /* Raise an exception to stop the current operation
1249 * and reinitialize our state. */
1250 DBG(fsg, "cbi reset request\n");
1251 raise_exception(fsg, FSG_STATE_RESET);
1255 VDBG(fsg, "CB[I] accept device-specific command\n");
1256 spin_lock(&fsg->lock);
1258 /* Save the command for later */
1259 if (fsg->cbbuf_cmnd_size)
1260 WARN(fsg, "CB[I] overwriting previous command\n");
1261 fsg->cbbuf_cmnd_size = req->actual;
1262 memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
1264 spin_unlock(&fsg->lock);
1269 static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh)
1271 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
1274 static int class_setup_req(struct fsg_dev *fsg,
1275 const struct usb_ctrlrequest *ctrl)
1277 struct usb_request *req = fsg->ep0req;
1278 int value = -EOPNOTSUPP;
1279 u16 w_index = le16_to_cpu(ctrl->wIndex);
1280 u16 w_length = le16_to_cpu(ctrl->wLength);
1285 /* Handle Bulk-only class-specific requests */
1286 if (transport_is_bbb()) {
1287 switch (ctrl->bRequest) {
1289 case USB_BULK_RESET_REQUEST:
1290 if (ctrl->bRequestType != (USB_DIR_OUT |
1291 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1298 /* Raise an exception to stop the current operation
1299 * and reinitialize our state. */
1300 DBG(fsg, "bulk reset request\n");
1301 raise_exception(fsg, FSG_STATE_RESET);
1302 value = DELAYED_STATUS;
1305 case USB_BULK_GET_MAX_LUN_REQUEST:
1306 if (ctrl->bRequestType != (USB_DIR_IN |
1307 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1313 VDBG(fsg, "get max LUN\n");
1314 *(u8 *) req->buf = fsg->nluns - 1;
1320 /* Handle CBI class-specific requests */
1322 switch (ctrl->bRequest) {
1324 case USB_CBI_ADSC_REQUEST:
1325 if (ctrl->bRequestType != (USB_DIR_OUT |
1326 USB_TYPE_CLASS | USB_RECIP_INTERFACE))
1332 if (w_length > MAX_COMMAND_SIZE) {
1337 fsg->ep0req->context = received_cbi_adsc;
1342 if (value == -EOPNOTSUPP)
1344 "unknown class-specific control req "
1345 "%02x.%02x v%04x i%04x l%u\n",
1346 ctrl->bRequestType, ctrl->bRequest,
1347 le16_to_cpu(ctrl->wValue), w_index, w_length);
1352 /*-------------------------------------------------------------------------*/
1354 /* Ep0 standard request handlers. These always run in_irq. */
1356 static int standard_setup_req(struct fsg_dev *fsg,
1357 const struct usb_ctrlrequest *ctrl)
1359 struct usb_request *req = fsg->ep0req;
1360 int value = -EOPNOTSUPP;
1361 u16 w_index = le16_to_cpu(ctrl->wIndex);
1362 u16 w_value = le16_to_cpu(ctrl->wValue);
1364 /* Usually this just stores reply data in the pre-allocated ep0 buffer,
1365 * but config change events will also reconfigure hardware. */
1366 switch (ctrl->bRequest) {
1368 case USB_REQ_GET_DESCRIPTOR:
1369 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1372 switch (w_value >> 8) {
1375 VDBG(fsg, "get device descriptor\n");
1376 value = sizeof device_desc;
1377 memcpy(req->buf, &device_desc, value);
1379 #ifdef CONFIG_USB_GADGET_DUALSPEED
1380 case USB_DT_DEVICE_QUALIFIER:
1381 VDBG(fsg, "get device qualifier\n");
1382 if (!fsg->gadget->is_dualspeed)
1384 value = sizeof dev_qualifier;
1385 memcpy(req->buf, &dev_qualifier, value);
1388 case USB_DT_OTHER_SPEED_CONFIG:
1389 VDBG(fsg, "get other-speed config descriptor\n");
1390 if (!fsg->gadget->is_dualspeed)
1395 VDBG(fsg, "get configuration descriptor\n");
1396 #ifdef CONFIG_USB_GADGET_DUALSPEED
1399 value = populate_config_buf(fsg->gadget,
1406 VDBG(fsg, "get string descriptor\n");
1408 /* wIndex == language code */
1409 value = usb_gadget_get_string(&stringtab,
1410 w_value & 0xff, req->buf);
1415 /* One config, two speeds */
1416 case USB_REQ_SET_CONFIGURATION:
1417 if (ctrl->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD |
1420 VDBG(fsg, "set configuration\n");
1421 if (w_value == CONFIG_VALUE || w_value == 0) {
1422 fsg->new_config = w_value;
1424 /* Raise an exception to wipe out previous transaction
1425 * state (queued bufs, etc) and set the new config. */
1426 raise_exception(fsg, FSG_STATE_CONFIG_CHANGE);
1427 value = DELAYED_STATUS;
1430 case USB_REQ_GET_CONFIGURATION:
1431 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1434 VDBG(fsg, "get configuration\n");
1435 *(u8 *) req->buf = fsg->config;
1439 case USB_REQ_SET_INTERFACE:
1440 if (ctrl->bRequestType != (USB_DIR_OUT| USB_TYPE_STANDARD |
1441 USB_RECIP_INTERFACE))
1443 if (fsg->config && w_index == 0) {
1445 /* Raise an exception to wipe out previous transaction
1446 * state (queued bufs, etc) and install the new
1447 * interface altsetting. */
1448 raise_exception(fsg, FSG_STATE_INTERFACE_CHANGE);
1449 value = DELAYED_STATUS;
1452 case USB_REQ_GET_INTERFACE:
1453 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_STANDARD |
1454 USB_RECIP_INTERFACE))
1462 VDBG(fsg, "get interface\n");
1463 *(u8 *) req->buf = 0;
1469 "unknown control req %02x.%02x v%04x i%04x l%u\n",
1470 ctrl->bRequestType, ctrl->bRequest,
1471 w_value, w_index, le16_to_cpu(ctrl->wLength));
1478 static int fsg_setup(struct usb_gadget *gadget,
1479 const struct usb_ctrlrequest *ctrl)
1481 struct fsg_dev *fsg = get_gadget_data(gadget);
1483 int w_length = le16_to_cpu(ctrl->wLength);
1485 ++fsg->ep0_req_tag; // Record arrival of a new request
1486 fsg->ep0req->context = NULL;
1487 fsg->ep0req->length = 0;
1488 dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
1490 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
1491 rc = class_setup_req(fsg, ctrl);
1493 rc = standard_setup_req(fsg, ctrl);
1495 /* Respond with data/status or defer until later? */
1496 if (rc >= 0 && rc != DELAYED_STATUS) {
1497 rc = min(rc, w_length);
1498 fsg->ep0req->length = rc;
1499 fsg->ep0req->zero = rc < w_length;
1500 fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
1501 "ep0-in" : "ep0-out");
1502 rc = ep0_queue(fsg);
1505 /* Device either stalls (rc < 0) or reports success */
1510 /*-------------------------------------------------------------------------*/
1512 /* All the following routines run in process context */
1515 /* Use this for bulk or interrupt transfers, not ep0 */
1516 static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
1517 struct usb_request *req, volatile int *pbusy,
1518 volatile enum fsg_buffer_state *state)
1522 if (ep == fsg->bulk_in)
1523 dump_msg(fsg, "bulk-in", req->buf, req->length);
1524 else if (ep == fsg->intr_in)
1525 dump_msg(fsg, "intr-in", req->buf, req->length);
1527 *state = BUF_STATE_BUSY;
1528 rc = usb_ep_queue(ep, req, GFP_KERNEL);
1531 *state = BUF_STATE_EMPTY;
1533 /* We can't do much more than wait for a reset */
1535 /* Note: currently the net2280 driver fails zero-length
1536 * submissions if DMA is enabled. */
1537 if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
1539 WARN(fsg, "error in submission: %s --> %d\n",
1545 static int sleep_thread(struct fsg_dev *fsg)
1549 /* Wait until a signal arrives or we are woken up */
1550 rc = wait_event_interruptible(fsg->thread_wqh,
1551 fsg->thread_wakeup_needed);
1552 fsg->thread_wakeup_needed = 0;
1554 return (rc ? -EINTR : 0);
1558 /*-------------------------------------------------------------------------*/
1560 static int do_read(struct fsg_dev *fsg)
1562 struct lun *curlun = fsg->curlun;
1564 struct fsg_buffhd *bh;
1567 loff_t file_offset, file_offset_tmp;
1568 unsigned int amount;
1569 unsigned int partial_page;
1572 /* Get the starting Logical Block Address and check that it's
1574 if (fsg->cmnd[0] == SC_READ_6)
1575 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1577 lba = get_be32(&fsg->cmnd[2]);
1579 /* We allow DPO (Disable Page Out = don't save data in the
1580 * cache) and FUA (Force Unit Access = don't read from the
1581 * cache), but we don't implement them. */
1582 if ((fsg->cmnd[1] & ~0x18) != 0) {
1583 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1587 if (lba >= curlun->num_sectors) {
1588 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1591 file_offset = ((loff_t) lba) << 9;
1593 /* Carry out the file reads */
1594 amount_left = fsg->data_size_from_cmnd;
1595 if (unlikely(amount_left == 0))
1596 return -EIO; // No default reply
1600 /* Figure out how much we need to read:
1601 * Try to read the remaining amount.
1602 * But don't read more than the buffer size.
1603 * And don't try to read past the end of the file.
1604 * Finally, if we're not at a page boundary, don't read past
1606 * If this means reading 0 then we were asked to read past
1607 * the end of file. */
1608 amount = min((unsigned int) amount_left, mod_data.buflen);
1609 amount = min((loff_t) amount,
1610 curlun->file_length - file_offset);
1611 partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
1612 if (partial_page > 0)
1613 amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
1616 /* Wait for the next buffer to become available */
1617 bh = fsg->next_buffhd_to_fill;
1618 while (bh->state != BUF_STATE_EMPTY) {
1619 if ((rc = sleep_thread(fsg)) != 0)
1623 /* If we were asked to read past the end of file,
1624 * end with an empty buffer. */
1626 curlun->sense_data =
1627 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1628 curlun->sense_data_info = file_offset >> 9;
1629 bh->inreq->length = 0;
1630 bh->state = BUF_STATE_FULL;
1634 /* Perform the read */
1635 file_offset_tmp = file_offset;
1636 nread = vfs_read(curlun->filp,
1637 (char __user *) bh->buf,
1638 amount, &file_offset_tmp);
1639 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1640 (unsigned long long) file_offset,
1642 if (signal_pending(current))
1646 LDBG(curlun, "error in file read: %d\n",
1649 } else if (nread < amount) {
1650 LDBG(curlun, "partial file read: %d/%u\n",
1651 (int) nread, amount);
1652 nread -= (nread & 511); // Round down to a block
1654 file_offset += nread;
1655 amount_left -= nread;
1656 fsg->residue -= nread;
1657 bh->inreq->length = nread;
1658 bh->state = BUF_STATE_FULL;
1660 /* If an error occurred, report it and its position */
1661 if (nread < amount) {
1662 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
1663 curlun->sense_data_info = file_offset >> 9;
1667 if (amount_left == 0)
1668 break; // No more left to read
1670 /* Send this buffer and go read some more */
1671 bh->inreq->zero = 0;
1672 start_transfer(fsg, fsg->bulk_in, bh->inreq,
1673 &bh->inreq_busy, &bh->state);
1674 fsg->next_buffhd_to_fill = bh->next;
1677 return -EIO; // No default reply
1681 /*-------------------------------------------------------------------------*/
1683 static int do_write(struct fsg_dev *fsg)
1685 struct lun *curlun = fsg->curlun;
1687 struct fsg_buffhd *bh;
1689 u32 amount_left_to_req, amount_left_to_write;
1690 loff_t usb_offset, file_offset, file_offset_tmp;
1691 unsigned int amount;
1692 unsigned int partial_page;
1697 curlun->sense_data = SS_WRITE_PROTECTED;
1700 curlun->filp->f_flags &= ~O_SYNC; // Default is not to wait
1702 /* Get the starting Logical Block Address and check that it's
1704 if (fsg->cmnd[0] == SC_WRITE_6)
1705 lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
1707 lba = get_be32(&fsg->cmnd[2]);
1709 /* We allow DPO (Disable Page Out = don't save data in the
1710 * cache) and FUA (Force Unit Access = write directly to the
1711 * medium). We don't implement DPO; we implement FUA by
1712 * performing synchronous output. */
1713 if ((fsg->cmnd[1] & ~0x18) != 0) {
1714 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1717 if (fsg->cmnd[1] & 0x08) // FUA
1718 curlun->filp->f_flags |= O_SYNC;
1720 if (lba >= curlun->num_sectors) {
1721 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1725 /* Carry out the file writes */
1727 file_offset = usb_offset = ((loff_t) lba) << 9;
1728 amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
1730 while (amount_left_to_write > 0) {
1732 /* Queue a request for more data from the host */
1733 bh = fsg->next_buffhd_to_fill;
1734 if (bh->state == BUF_STATE_EMPTY && get_some_more) {
1736 /* Figure out how much we want to get:
1737 * Try to get the remaining amount.
1738 * But don't get more than the buffer size.
1739 * And don't try to go past the end of the file.
1740 * If we're not at a page boundary,
1741 * don't go past the next page.
1742 * If this means getting 0, then we were asked
1743 * to write past the end of file.
1744 * Finally, round down to a block boundary. */
1745 amount = min(amount_left_to_req, mod_data.buflen);
1746 amount = min((loff_t) amount, curlun->file_length -
1748 partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
1749 if (partial_page > 0)
1750 amount = min(amount,
1751 (unsigned int) PAGE_CACHE_SIZE - partial_page);
1755 curlun->sense_data =
1756 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1757 curlun->sense_data_info = usb_offset >> 9;
1760 amount -= (amount & 511);
1763 /* Why were we were asked to transfer a
1769 /* Get the next buffer */
1770 usb_offset += amount;
1771 fsg->usb_amount_left -= amount;
1772 amount_left_to_req -= amount;
1773 if (amount_left_to_req == 0)
1776 /* amount is always divisible by 512, hence by
1777 * the bulk-out maxpacket size */
1778 bh->outreq->length = bh->bulk_out_intended_length =
1780 start_transfer(fsg, fsg->bulk_out, bh->outreq,
1781 &bh->outreq_busy, &bh->state);
1782 fsg->next_buffhd_to_fill = bh->next;
1786 /* Write the received data to the backing file */
1787 bh = fsg->next_buffhd_to_drain;
1788 if (bh->state == BUF_STATE_EMPTY && !get_some_more)
1789 break; // We stopped early
1790 if (bh->state == BUF_STATE_FULL) {
1791 fsg->next_buffhd_to_drain = bh->next;
1792 bh->state = BUF_STATE_EMPTY;
1794 /* Did something go wrong with the transfer? */
1795 if (bh->outreq->status != 0) {
1796 curlun->sense_data = SS_COMMUNICATION_FAILURE;
1797 curlun->sense_data_info = file_offset >> 9;
1801 amount = bh->outreq->actual;
1802 if (curlun->file_length - file_offset < amount) {
1804 "write %u @ %llu beyond end %llu\n",
1805 amount, (unsigned long long) file_offset,
1806 (unsigned long long) curlun->file_length);
1807 amount = curlun->file_length - file_offset;
1810 /* Perform the write */
1811 file_offset_tmp = file_offset;
1812 nwritten = vfs_write(curlun->filp,
1813 (char __user *) bh->buf,
1814 amount, &file_offset_tmp);
1815 VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
1816 (unsigned long long) file_offset,
1818 if (signal_pending(current))
1819 return -EINTR; // Interrupted!
1822 LDBG(curlun, "error in file write: %d\n",
1825 } else if (nwritten < amount) {
1826 LDBG(curlun, "partial file write: %d/%u\n",
1827 (int) nwritten, amount);
1828 nwritten -= (nwritten & 511);
1829 // Round down to a block
1831 file_offset += nwritten;
1832 amount_left_to_write -= nwritten;
1833 fsg->residue -= nwritten;
1835 /* If an error occurred, report it and its position */
1836 if (nwritten < amount) {
1837 curlun->sense_data = SS_WRITE_ERROR;
1838 curlun->sense_data_info = file_offset >> 9;
1842 /* Did the host decide to stop early? */
1843 if (bh->outreq->actual != bh->outreq->length) {
1844 fsg->short_packet_received = 1;
1850 /* Wait for something to happen */
1851 if ((rc = sleep_thread(fsg)) != 0)
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;
1866 struct inode *inode;
1869 if (curlun->ro || !filp)
1871 if (!filp->f_op->fsync)
1874 inode = filp->f_dentry->d_inode;
1875 down(&inode->i_sem);
1876 current->flags |= PF_SYNCWRITE;
1877 rc = filemap_fdatawrite(inode->i_mapping);
1878 err = filp->f_op->fsync(filp, filp->f_dentry, 1);
1881 err = filemap_fdatawait(inode->i_mapping);
1884 current->flags &= ~PF_SYNCWRITE;
1886 VLDBG(curlun, "fdatasync -> %d\n", rc);
1890 static void fsync_all(struct fsg_dev *fsg)
1894 for (i = 0; i < fsg->nluns; ++i)
1895 fsync_sub(&fsg->luns[i]);
1898 static int do_synchronize_cache(struct fsg_dev *fsg)
1900 struct lun *curlun = fsg->curlun;
1903 /* We ignore the requested LBA and write out all file's
1904 * dirty data buffers. */
1905 rc = fsync_sub(curlun);
1907 curlun->sense_data = SS_WRITE_ERROR;
1912 /*-------------------------------------------------------------------------*/
1914 static void invalidate_sub(struct lun *curlun)
1916 struct file *filp = curlun->filp;
1917 struct inode *inode = filp->f_dentry->d_inode;
1920 rc = invalidate_inode_pages(inode->i_mapping);
1921 VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc);
1924 static int do_verify(struct fsg_dev *fsg)
1926 struct lun *curlun = fsg->curlun;
1928 u32 verification_length;
1929 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
1930 loff_t file_offset, file_offset_tmp;
1932 unsigned int amount;
1935 /* Get the starting Logical Block Address and check that it's
1937 lba = get_be32(&fsg->cmnd[2]);
1938 if (lba >= curlun->num_sectors) {
1939 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1943 /* We allow DPO (Disable Page Out = don't save data in the
1944 * cache) but we don't implement it. */
1945 if ((fsg->cmnd[1] & ~0x10) != 0) {
1946 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
1950 verification_length = get_be16(&fsg->cmnd[7]);
1951 if (unlikely(verification_length == 0))
1952 return -EIO; // No default reply
1954 /* Prepare to carry out the file verify */
1955 amount_left = verification_length << 9;
1956 file_offset = ((loff_t) lba) << 9;
1958 /* Write out all the dirty buffers before invalidating them */
1960 if (signal_pending(current))
1963 invalidate_sub(curlun);
1964 if (signal_pending(current))
1967 /* Just try to read the requested blocks */
1968 while (amount_left > 0) {
1970 /* Figure out how much we need to read:
1971 * Try to read the remaining amount, but not more than
1973 * And don't try to read past the end of the file.
1974 * If this means reading 0 then we were asked to read
1975 * past the end of file. */
1976 amount = min((unsigned int) amount_left, mod_data.buflen);
1977 amount = min((loff_t) amount,
1978 curlun->file_length - file_offset);
1980 curlun->sense_data =
1981 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
1982 curlun->sense_data_info = file_offset >> 9;
1986 /* Perform the read */
1987 file_offset_tmp = file_offset;
1988 nread = vfs_read(curlun->filp,
1989 (char __user *) bh->buf,
1990 amount, &file_offset_tmp);
1991 VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
1992 (unsigned long long) file_offset,
1994 if (signal_pending(current))
1998 LDBG(curlun, "error in file verify: %d\n",
2001 } else if (nread < amount) {
2002 LDBG(curlun, "partial file verify: %d/%u\n",
2003 (int) nread, amount);
2004 nread -= (nread & 511); // Round down to a sector
2007 curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
2008 curlun->sense_data_info = file_offset >> 9;
2011 file_offset += nread;
2012 amount_left -= nread;
2018 /*-------------------------------------------------------------------------*/
2020 static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2022 u8 *buf = (u8 *) bh->buf;
2024 static char vendor_id[] = "Linux ";
2025 static char product_id[] = "File-Stor Gadget";
2027 if (!fsg->curlun) { // Unsupported LUNs are okay
2028 fsg->bad_lun_okay = 1;
2030 buf[0] = 0x7f; // Unsupported, no device-type
2034 memset(buf, 0, 8); // Non-removable, direct-access device
2035 if (mod_data.removable)
2037 buf[2] = 2; // ANSI SCSI level 2
2038 buf[3] = 2; // SCSI-2 INQUIRY data format
2039 buf[4] = 31; // Additional length
2040 // No special options
2041 sprintf(buf + 8, "%-8s%-16s%04x", vendor_id, product_id,
2047 static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2049 struct lun *curlun = fsg->curlun;
2050 u8 *buf = (u8 *) bh->buf;
2054 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
2056 * If a REQUEST SENSE command is received from an initiator
2057 * with a pending unit attention condition (before the target
2058 * generates the contingent allegiance condition), then the
2059 * target shall either:
2060 * a) report any pending sense data and preserve the unit
2061 * attention condition on the logical unit, or,
2062 * b) report the unit attention condition, may discard any
2063 * pending sense data, and clear the unit attention
2064 * condition on the logical unit for that initiator.
2066 * FSG normally uses option a); enable this code to use option b).
2069 if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
2070 curlun->sense_data = curlun->unit_attention_data;
2071 curlun->unit_attention_data = SS_NO_SENSE;
2075 if (!curlun) { // Unsupported LUNs are okay
2076 fsg->bad_lun_okay = 1;
2077 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2080 sd = curlun->sense_data;
2081 sdinfo = curlun->sense_data_info;
2082 curlun->sense_data = SS_NO_SENSE;
2083 curlun->sense_data_info = 0;
2087 buf[0] = 0x80 | 0x70; // Valid, current error
2089 put_be32(&buf[3], sdinfo); // Sense information
2090 buf[7] = 18 - 8; // Additional sense length
2097 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2099 struct lun *curlun = fsg->curlun;
2100 u32 lba = get_be32(&fsg->cmnd[2]);
2101 int pmi = fsg->cmnd[8];
2102 u8 *buf = (u8 *) bh->buf;
2104 /* Check the PMI and LBA fields */
2105 if (pmi > 1 || (pmi == 0 && lba != 0)) {
2106 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2110 put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
2111 put_be32(&buf[4], 512); // Block length
2116 static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2118 struct lun *curlun = fsg->curlun;
2119 int mscmnd = fsg->cmnd[0];
2120 u8 *buf = (u8 *) bh->buf;
2123 int changeable_values, all_pages;
2127 if ((fsg->cmnd[1] & ~0x08) != 0) { // Mask away DBD
2128 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2131 pc = fsg->cmnd[2] >> 6;
2132 page_code = fsg->cmnd[2] & 0x3f;
2134 curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
2137 changeable_values = (pc == 1);
2138 all_pages = (page_code == 0x3f);
2140 /* Write the mode parameter header. Fixed values are: default
2141 * medium type, no cache control (DPOFUA), and no block descriptors.
2142 * The only variable value is the WriteProtect bit. We will fill in
2143 * the mode data length later. */
2145 if (mscmnd == SC_MODE_SENSE_6) {
2146 buf[2] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2149 } else { // SC_MODE_SENSE_10
2150 buf[3] = (curlun->ro ? 0x80 : 0x00); // WP, DPOFUA
2152 limit = 65535; // Should really be mod_data.buflen
2155 /* No block descriptors */
2157 /* The mode pages, in numerical order. The only page we support
2158 * is the Caching page. */
2159 if (page_code == 0x08 || all_pages) {
2161 buf[0] = 0x08; // Page code
2162 buf[1] = 10; // Page length
2163 memset(buf+2, 0, 10); // None of the fields are changeable
2165 if (!changeable_values) {
2166 buf[2] = 0x04; // Write cache enable,
2167 // Read cache not disabled
2168 // No cache retention priorities
2169 put_be16(&buf[4], 0xffff); // Don't disable prefetch
2170 // Minimum prefetch = 0
2171 put_be16(&buf[8], 0xffff); // Maximum prefetch
2172 put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
2177 /* Check that a valid page was requested and the mode data length
2178 * isn't too long. */
2180 if (!valid_page || len > limit) {
2181 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2185 /* Store the mode data length */
2186 if (mscmnd == SC_MODE_SENSE_6)
2189 put_be16(buf0, len - 2);
2194 static int do_start_stop(struct fsg_dev *fsg)
2196 struct lun *curlun = fsg->curlun;
2199 if (!mod_data.removable) {
2200 curlun->sense_data = SS_INVALID_COMMAND;
2204 // int immed = fsg->cmnd[1] & 0x01;
2205 loej = fsg->cmnd[4] & 0x02;
2206 start = fsg->cmnd[4] & 0x01;
2208 #ifdef CONFIG_USB_FILE_STORAGE_TEST
2209 if ((fsg->cmnd[1] & ~0x01) != 0 || // Mask away Immed
2210 (fsg->cmnd[4] & ~0x03) != 0) { // Mask LoEj, Start
2211 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2217 /* Are we allowed to unload the media? */
2218 if (curlun->prevent_medium_removal) {
2219 LDBG(curlun, "unload attempt prevented\n");
2220 curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
2223 if (loej) { // Simulate an unload/eject
2224 up_read(&fsg->filesem);
2225 down_write(&fsg->filesem);
2226 close_backing_file(curlun);
2227 up_write(&fsg->filesem);
2228 down_read(&fsg->filesem);
2232 /* Our emulation doesn't support mounting; the medium is
2233 * available for use as soon as it is loaded. */
2234 if (!backing_file_is_open(curlun)) {
2235 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2244 static int do_prevent_allow(struct fsg_dev *fsg)
2246 struct lun *curlun = fsg->curlun;
2249 if (!mod_data.removable) {
2250 curlun->sense_data = SS_INVALID_COMMAND;
2254 prevent = fsg->cmnd[4] & 0x01;
2255 if ((fsg->cmnd[4] & ~0x01) != 0) { // Mask away Prevent
2256 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2260 if (curlun->prevent_medium_removal && !prevent)
2262 curlun->prevent_medium_removal = prevent;
2267 static int do_read_format_capacities(struct fsg_dev *fsg,
2268 struct fsg_buffhd *bh)
2270 struct lun *curlun = fsg->curlun;
2271 u8 *buf = (u8 *) bh->buf;
2273 buf[0] = buf[1] = buf[2] = 0;
2274 buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
2277 put_be32(&buf[0], curlun->num_sectors); // Number of blocks
2278 put_be32(&buf[4], 512); // Block length
2279 buf[4] = 0x02; // Current capacity
2284 static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2286 struct lun *curlun = fsg->curlun;
2288 /* We don't support MODE SELECT */
2289 curlun->sense_data = SS_INVALID_COMMAND;
2294 /*-------------------------------------------------------------------------*/
2296 static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
2300 rc = fsg_set_halt(fsg, fsg->bulk_in);
2302 VDBG(fsg, "delayed bulk-in endpoint halt\n");
2304 if (rc != -EAGAIN) {
2305 WARN(fsg, "usb_ep_set_halt -> %d\n", rc);
2310 /* Wait for a short time and then try again */
2311 if (msleep_interruptible(100) != 0)
2313 rc = usb_ep_set_halt(fsg->bulk_in);
2318 static int pad_with_zeros(struct fsg_dev *fsg)
2320 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2321 u32 nkeep = bh->inreq->length;
2325 bh->state = BUF_STATE_EMPTY; // For the first iteration
2326 fsg->usb_amount_left = nkeep + fsg->residue;
2327 while (fsg->usb_amount_left > 0) {
2329 /* Wait for the next buffer to be free */
2330 while (bh->state != BUF_STATE_EMPTY) {
2331 if ((rc = sleep_thread(fsg)) != 0)
2335 nsend = min(fsg->usb_amount_left, (u32) mod_data.buflen);
2336 memset(bh->buf + nkeep, 0, nsend - nkeep);
2337 bh->inreq->length = nsend;
2338 bh->inreq->zero = 0;
2339 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2340 &bh->inreq_busy, &bh->state);
2341 bh = fsg->next_buffhd_to_fill = bh->next;
2342 fsg->usb_amount_left -= nsend;
2348 static int throw_away_data(struct fsg_dev *fsg)
2350 struct fsg_buffhd *bh;
2354 while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY ||
2355 fsg->usb_amount_left > 0) {
2357 /* Throw away the data in a filled buffer */
2358 if (bh->state == BUF_STATE_FULL) {
2359 bh->state = BUF_STATE_EMPTY;
2360 fsg->next_buffhd_to_drain = bh->next;
2362 /* A short packet or an error ends everything */
2363 if (bh->outreq->actual != bh->outreq->length ||
2364 bh->outreq->status != 0) {
2365 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2371 /* Try to submit another request if we need one */
2372 bh = fsg->next_buffhd_to_fill;
2373 if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) {
2374 amount = min(fsg->usb_amount_left,
2375 (u32) mod_data.buflen);
2377 /* amount is always divisible by 512, hence by
2378 * the bulk-out maxpacket size */
2379 bh->outreq->length = bh->bulk_out_intended_length =
2381 start_transfer(fsg, fsg->bulk_out, bh->outreq,
2382 &bh->outreq_busy, &bh->state);
2383 fsg->next_buffhd_to_fill = bh->next;
2384 fsg->usb_amount_left -= amount;
2388 /* Otherwise wait for something to happen */
2389 if ((rc = sleep_thread(fsg)) != 0)
2396 static int finish_reply(struct fsg_dev *fsg)
2398 struct fsg_buffhd *bh = fsg->next_buffhd_to_fill;
2401 switch (fsg->data_dir) {
2403 break; // Nothing to send
2405 /* If we don't know whether the host wants to read or write,
2406 * this must be CB or CBI with an unknown command. We mustn't
2407 * try to send or receive any data. So stall both bulk pipes
2408 * if we can and wait for a reset. */
2409 case DATA_DIR_UNKNOWN:
2410 if (mod_data.can_stall) {
2411 fsg_set_halt(fsg, fsg->bulk_out);
2412 rc = halt_bulk_in_endpoint(fsg);
2416 /* All but the last buffer of data must have already been sent */
2417 case DATA_DIR_TO_HOST:
2418 if (fsg->data_size == 0)
2419 ; // Nothing to send
2421 /* If there's no residue, simply send the last buffer */
2422 else if (fsg->residue == 0) {
2423 bh->inreq->zero = 0;
2424 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2425 &bh->inreq_busy, &bh->state);
2426 fsg->next_buffhd_to_fill = bh->next;
2429 /* There is a residue. For CB and CBI, simply mark the end
2430 * of the data with a short packet. However, if we are
2431 * allowed to stall, there was no data at all (residue ==
2432 * data_size), and the command failed (invalid LUN or
2433 * sense data is set), then halt the bulk-in endpoint
2435 else if (!transport_is_bbb()) {
2436 if (mod_data.can_stall &&
2437 fsg->residue == fsg->data_size &&
2438 (!fsg->curlun || fsg->curlun->sense_data != SS_NO_SENSE)) {
2439 bh->state = BUF_STATE_EMPTY;
2440 rc = halt_bulk_in_endpoint(fsg);
2442 bh->inreq->zero = 1;
2443 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2444 &bh->inreq_busy, &bh->state);
2445 fsg->next_buffhd_to_fill = bh->next;
2449 /* For Bulk-only, if we're allowed to stall then send the
2450 * short packet and halt the bulk-in endpoint. If we can't
2451 * stall, pad out the remaining data with 0's. */
2453 if (mod_data.can_stall) {
2454 bh->inreq->zero = 1;
2455 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2456 &bh->inreq_busy, &bh->state);
2457 fsg->next_buffhd_to_fill = bh->next;
2458 rc = halt_bulk_in_endpoint(fsg);
2460 rc = pad_with_zeros(fsg);
2464 /* We have processed all we want from the data the host has sent.
2465 * There may still be outstanding bulk-out requests. */
2466 case DATA_DIR_FROM_HOST:
2467 if (fsg->residue == 0)
2468 ; // Nothing to receive
2470 /* Did the host stop sending unexpectedly early? */
2471 else if (fsg->short_packet_received) {
2472 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2476 /* We haven't processed all the incoming data. Even though
2477 * we may be allowed to stall, doing so would cause a race.
2478 * The controller may already have ACK'ed all the remaining
2479 * bulk-out packets, in which case the host wouldn't see a
2480 * STALL. Not realizing the endpoint was halted, it wouldn't
2481 * clear the halt -- leading to problems later on. */
2483 else if (mod_data.can_stall) {
2484 fsg_set_halt(fsg, fsg->bulk_out);
2485 raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
2490 /* We can't stall. Read in the excess data and throw it
2493 rc = throw_away_data(fsg);
2500 static int send_status(struct fsg_dev *fsg)
2502 struct lun *curlun = fsg->curlun;
2503 struct fsg_buffhd *bh;
2505 u8 status = USB_STATUS_PASS;
2508 /* Wait for the next buffer to become available */
2509 bh = fsg->next_buffhd_to_fill;
2510 while (bh->state != BUF_STATE_EMPTY) {
2511 if ((rc = sleep_thread(fsg)) != 0)
2516 sd = curlun->sense_data;
2517 sdinfo = curlun->sense_data_info;
2518 } else if (fsg->bad_lun_okay)
2521 sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
2523 if (fsg->phase_error) {
2524 DBG(fsg, "sending phase-error status\n");
2525 status = USB_STATUS_PHASE_ERROR;
2526 sd = SS_INVALID_COMMAND;
2527 } else if (sd != SS_NO_SENSE) {
2528 DBG(fsg, "sending command-failure status\n");
2529 status = USB_STATUS_FAIL;
2530 VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
2532 SK(sd), ASC(sd), ASCQ(sd), sdinfo);
2535 if (transport_is_bbb()) {
2536 struct bulk_cs_wrap *csw = (struct bulk_cs_wrap *) bh->buf;
2538 /* Store and send the Bulk-only CSW */
2539 csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG);
2540 csw->Tag = fsg->tag;
2541 csw->Residue = cpu_to_le32(fsg->residue);
2542 csw->Status = status;
2544 bh->inreq->length = USB_BULK_CS_WRAP_LEN;
2545 bh->inreq->zero = 0;
2546 start_transfer(fsg, fsg->bulk_in, bh->inreq,
2547 &bh->inreq_busy, &bh->state);
2549 } else if (mod_data.transport_type == USB_PR_CB) {
2551 /* Control-Bulk transport has no status phase! */
2554 } else { // USB_PR_CBI
2555 struct interrupt_data *buf = (struct interrupt_data *)
2558 /* Store and send the Interrupt data. UFI sends the ASC
2559 * and ASCQ bytes. Everything else sends a Type (which
2560 * is always 0) and the status Value. */
2561 if (mod_data.protocol_type == USB_SC_UFI) {
2562 buf->bType = ASC(sd);
2563 buf->bValue = ASCQ(sd);
2566 buf->bValue = status;
2568 fsg->intreq->length = CBI_INTERRUPT_DATA_LEN;
2570 fsg->intr_buffhd = bh; // Point to the right buffhd
2571 fsg->intreq->buf = bh->inreq->buf;
2572 fsg->intreq->dma = bh->inreq->dma;
2573 fsg->intreq->context = bh;
2574 start_transfer(fsg, fsg->intr_in, fsg->intreq,
2575 &fsg->intreq_busy, &bh->state);
2578 fsg->next_buffhd_to_fill = bh->next;
2583 /*-------------------------------------------------------------------------*/
2585 /* Check whether the command is properly formed and whether its data size
2586 * and direction agree with the values we already have. */
2587 static int check_command(struct fsg_dev *fsg, int cmnd_size,
2588 enum data_direction data_dir, unsigned int mask,
2589 int needs_medium, const char *name)
2592 int lun = fsg->cmnd[1] >> 5;
2593 static const char dirletter[4] = {'u', 'o', 'i', 'n'};
2597 /* Adjust the expected cmnd_size for protocol encapsulation padding.
2598 * Transparent SCSI doesn't pad. */
2599 if (protocol_is_scsi())
2602 /* There's some disagreement as to whether RBC pads commands or not.
2603 * We'll play it safe and accept either form. */
2604 else if (mod_data.protocol_type == USB_SC_RBC) {
2605 if (fsg->cmnd_size == 12)
2608 /* All the other protocols pad to 12 bytes */
2613 if (fsg->data_dir != DATA_DIR_UNKNOWN)
2614 sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir],
2616 VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
2617 name, cmnd_size, dirletter[(int) data_dir],
2618 fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen);
2620 /* We can't reply at all until we know the correct data direction
2622 if (fsg->data_size_from_cmnd == 0)
2623 data_dir = DATA_DIR_NONE;
2624 if (fsg->data_dir == DATA_DIR_UNKNOWN) { // CB or CBI
2625 fsg->data_dir = data_dir;
2626 fsg->data_size = fsg->data_size_from_cmnd;
2628 } else { // Bulk-only
2629 if (fsg->data_size < fsg->data_size_from_cmnd) {
2631 /* Host data size < Device data size is a phase error.
2632 * Carry out the command, but only transfer as much
2633 * as we are allowed. */
2634 fsg->data_size_from_cmnd = fsg->data_size;
2635 fsg->phase_error = 1;
2638 fsg->residue = fsg->usb_amount_left = fsg->data_size;
2640 /* Conflicting data directions is a phase error */
2641 if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) {
2642 fsg->phase_error = 1;
2646 /* Verify the length of the command itself */
2647 if (cmnd_size != fsg->cmnd_size) {
2649 /* Special case workaround: MS-Windows issues REQUEST SENSE
2650 * with cbw->Length == 12 (it should be 6). */
2651 if (fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12)
2652 cmnd_size = fsg->cmnd_size;
2654 fsg->phase_error = 1;
2659 /* Check that the LUN values are consistent */
2660 if (transport_is_bbb()) {
2661 if (fsg->lun != lun)
2662 DBG(fsg, "using LUN %d from CBW, "
2663 "not LUN %d from CDB\n",
2666 fsg->lun = lun; // Use LUN from the command
2669 if (fsg->lun >= 0 && fsg->lun < fsg->nluns) {
2670 fsg->curlun = curlun = &fsg->luns[fsg->lun];
2671 if (fsg->cmnd[0] != SC_REQUEST_SENSE) {
2672 curlun->sense_data = SS_NO_SENSE;
2673 curlun->sense_data_info = 0;
2676 fsg->curlun = curlun = NULL;
2677 fsg->bad_lun_okay = 0;
2679 /* INQUIRY and REQUEST SENSE commands are explicitly allowed
2680 * to use unsupported LUNs; all others may not. */
2681 if (fsg->cmnd[0] != SC_INQUIRY &&
2682 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2683 DBG(fsg, "unsupported LUN %d\n", fsg->lun);
2688 /* If a unit attention condition exists, only INQUIRY and
2689 * REQUEST SENSE commands are allowed; anything else must fail. */
2690 if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
2691 fsg->cmnd[0] != SC_INQUIRY &&
2692 fsg->cmnd[0] != SC_REQUEST_SENSE) {
2693 curlun->sense_data = curlun->unit_attention_data;
2694 curlun->unit_attention_data = SS_NO_SENSE;
2698 /* Check that only command bytes listed in the mask are non-zero */
2699 fsg->cmnd[1] &= 0x1f; // Mask away the LUN
2700 for (i = 1; i < cmnd_size; ++i) {
2701 if (fsg->cmnd[i] && !(mask & (1 << i))) {
2703 curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
2708 /* If the medium isn't mounted and the command needs to access
2709 * it, return an error. */
2710 if (curlun && !backing_file_is_open(curlun) && needs_medium) {
2711 curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
2719 static int do_scsi_command(struct fsg_dev *fsg)
2721 struct fsg_buffhd *bh;
2723 int reply = -EINVAL;
2725 static char unknown[16];
2729 /* Wait for the next buffer to become available for data or status */
2730 bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill;
2731 while (bh->state != BUF_STATE_EMPTY) {
2732 if ((rc = sleep_thread(fsg)) != 0)
2735 fsg->phase_error = 0;
2736 fsg->short_packet_received = 0;
2738 down_read(&fsg->filesem); // We're using the backing file
2739 switch (fsg->cmnd[0]) {
2742 fsg->data_size_from_cmnd = fsg->cmnd[4];
2743 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2746 reply = do_inquiry(fsg, bh);
2749 case SC_MODE_SELECT_6:
2750 fsg->data_size_from_cmnd = fsg->cmnd[4];
2751 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2753 "MODE SELECT(6)")) == 0)
2754 reply = do_mode_select(fsg, bh);
2757 case SC_MODE_SELECT_10:
2758 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2759 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2761 "MODE SELECT(10)")) == 0)
2762 reply = do_mode_select(fsg, bh);
2765 case SC_MODE_SENSE_6:
2766 fsg->data_size_from_cmnd = fsg->cmnd[4];
2767 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2768 (1<<1) | (1<<2) | (1<<4), 0,
2769 "MODE SENSE(6)")) == 0)
2770 reply = do_mode_sense(fsg, bh);
2773 case SC_MODE_SENSE_10:
2774 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2775 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2776 (1<<1) | (1<<2) | (3<<7), 0,
2777 "MODE SENSE(10)")) == 0)
2778 reply = do_mode_sense(fsg, bh);
2781 case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
2782 fsg->data_size_from_cmnd = 0;
2783 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2785 "PREVENT-ALLOW MEDIUM REMOVAL")) == 0)
2786 reply = do_prevent_allow(fsg);
2791 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2792 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2795 reply = do_read(fsg);
2799 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2800 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2801 (1<<1) | (0xf<<2) | (3<<7), 1,
2803 reply = do_read(fsg);
2807 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2808 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
2809 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2811 reply = do_read(fsg);
2814 case SC_READ_CAPACITY:
2815 fsg->data_size_from_cmnd = 8;
2816 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2817 (0xf<<2) | (1<<8), 1,
2818 "READ CAPACITY")) == 0)
2819 reply = do_read_capacity(fsg, bh);
2822 case SC_READ_FORMAT_CAPACITIES:
2823 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
2824 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
2826 "READ FORMAT CAPACITIES")) == 0)
2827 reply = do_read_format_capacities(fsg, bh);
2830 case SC_REQUEST_SENSE:
2831 fsg->data_size_from_cmnd = fsg->cmnd[4];
2832 if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
2834 "REQUEST SENSE")) == 0)
2835 reply = do_request_sense(fsg, bh);
2838 case SC_START_STOP_UNIT:
2839 fsg->data_size_from_cmnd = 0;
2840 if ((reply = check_command(fsg, 6, DATA_DIR_NONE,
2842 "START-STOP UNIT")) == 0)
2843 reply = do_start_stop(fsg);
2846 case SC_SYNCHRONIZE_CACHE:
2847 fsg->data_size_from_cmnd = 0;
2848 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2849 (0xf<<2) | (3<<7), 1,
2850 "SYNCHRONIZE CACHE")) == 0)
2851 reply = do_synchronize_cache(fsg);
2854 case SC_TEST_UNIT_READY:
2855 fsg->data_size_from_cmnd = 0;
2856 reply = check_command(fsg, 6, DATA_DIR_NONE,
2861 /* Although optional, this command is used by MS-Windows. We
2862 * support a minimal version: BytChk must be 0. */
2864 fsg->data_size_from_cmnd = 0;
2865 if ((reply = check_command(fsg, 10, DATA_DIR_NONE,
2866 (1<<1) | (0xf<<2) | (3<<7), 1,
2868 reply = do_verify(fsg);
2873 fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
2874 if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
2877 reply = do_write(fsg);
2881 fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
2882 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
2883 (1<<1) | (0xf<<2) | (3<<7), 1,
2885 reply = do_write(fsg);
2889 fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
2890 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
2891 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2893 reply = do_write(fsg);
2896 /* Some mandatory commands that we recognize but don't implement.
2897 * They don't mean much in this setting. It's left as an exercise
2898 * for anyone interested to implement RESERVE and RELEASE in terms
2899 * of Posix locks. */
2900 case SC_FORMAT_UNIT:
2903 case SC_SEND_DIAGNOSTIC:
2907 fsg->data_size_from_cmnd = 0;
2908 sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]);
2909 if ((reply = check_command(fsg, fsg->cmnd_size,
2910 DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) {
2911 fsg->curlun->sense_data = SS_INVALID_COMMAND;
2916 up_read(&fsg->filesem);
2918 if (reply == -EINTR || signal_pending(current))
2921 /* Set up the single reply buffer for finish_reply() */
2922 if (reply == -EINVAL)
2923 reply = 0; // Error reply length
2924 if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) {
2925 reply = min((u32) reply, fsg->data_size_from_cmnd);
2926 bh->inreq->length = reply;
2927 bh->state = BUF_STATE_FULL;
2928 fsg->residue -= reply;
2929 } // Otherwise it's already set
2935 /*-------------------------------------------------------------------------*/
2937 static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
2939 struct usb_request *req = bh->outreq;
2940 struct bulk_cb_wrap *cbw = (struct bulk_cb_wrap *) req->buf;
2942 /* Was this a real packet? */
2946 /* Is the CBW valid? */
2947 if (req->actual != USB_BULK_CB_WRAP_LEN ||
2948 cbw->Signature != __constant_cpu_to_le32(
2950 DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
2952 le32_to_cpu(cbw->Signature));
2954 /* The Bulk-only spec says we MUST stall the bulk pipes!
2955 * If we want to avoid stalls, set a flag so that we will
2956 * clear the endpoint halts at the next reset. */
2957 if (!mod_data.can_stall)
2958 set_bit(CLEAR_BULK_HALTS, &fsg->atomic_bitflags);
2959 fsg_set_halt(fsg, fsg->bulk_out);
2960 halt_bulk_in_endpoint(fsg);
2964 /* Is the CBW meaningful? */
2965 if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
2966 cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
2967 DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
2969 cbw->Lun, cbw->Flags, cbw->Length);
2971 /* We can do anything we want here, so let's stall the
2972 * bulk pipes if we are allowed to. */
2973 if (mod_data.can_stall) {
2974 fsg_set_halt(fsg, fsg->bulk_out);
2975 halt_bulk_in_endpoint(fsg);
2980 /* Save the command for later */
2981 fsg->cmnd_size = cbw->Length;
2982 memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size);
2983 if (cbw->Flags & USB_BULK_IN_FLAG)
2984 fsg->data_dir = DATA_DIR_TO_HOST;
2986 fsg->data_dir = DATA_DIR_FROM_HOST;
2987 fsg->data_size = le32_to_cpu(cbw->DataTransferLength);
2988 if (fsg->data_size == 0)
2989 fsg->data_dir = DATA_DIR_NONE;
2990 fsg->lun = cbw->Lun;
2991 fsg->tag = cbw->Tag;
2996 static int get_next_command(struct fsg_dev *fsg)
2998 struct fsg_buffhd *bh;
3001 if (transport_is_bbb()) {
3003 /* Wait for the next buffer to become available */
3004 bh = fsg->next_buffhd_to_fill;
3005 while (bh->state != BUF_STATE_EMPTY) {
3006 if ((rc = sleep_thread(fsg)) != 0)
3010 /* Queue a request to read a Bulk-only CBW */
3011 set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
3012 start_transfer(fsg, fsg->bulk_out, bh->outreq,
3013 &bh->outreq_busy, &bh->state);
3015 /* We will drain the buffer in software, which means we
3016 * can reuse it for the next filling. No need to advance
3017 * next_buffhd_to_fill. */
3019 /* Wait for the CBW to arrive */
3020 while (bh->state != BUF_STATE_FULL) {
3021 if ((rc = sleep_thread(fsg)) != 0)
3024 rc = received_cbw(fsg, bh);
3025 bh->state = BUF_STATE_EMPTY;
3027 } else { // USB_PR_CB or USB_PR_CBI
3029 /* Wait for the next command to arrive */
3030 while (fsg->cbbuf_cmnd_size == 0) {
3031 if ((rc = sleep_thread(fsg)) != 0)
3035 /* Is the previous status interrupt request still busy?
3036 * The host is allowed to skip reading the status,
3037 * so we must cancel it. */
3038 if (fsg->intreq_busy)
3039 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3041 /* Copy the command and mark the buffer empty */
3042 fsg->data_dir = DATA_DIR_UNKNOWN;
3043 spin_lock_irq(&fsg->lock);
3044 fsg->cmnd_size = fsg->cbbuf_cmnd_size;
3045 memcpy(fsg->cmnd, fsg->cbbuf_cmnd, fsg->cmnd_size);
3046 fsg->cbbuf_cmnd_size = 0;
3047 spin_unlock_irq(&fsg->lock);
3053 /*-------------------------------------------------------------------------*/
3055 static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
3056 const struct usb_endpoint_descriptor *d)
3060 ep->driver_data = fsg;
3061 rc = usb_ep_enable(ep, d);
3063 ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
3067 static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep,
3068 struct usb_request **preq)
3070 *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
3073 ERROR(fsg, "can't allocate request for %s\n", ep->name);
3078 * Reset interface setting and re-init endpoint state (toggle etc).
3079 * Call with altsetting < 0 to disable the interface. The only other
3080 * available altsetting is 0, which enables the interface.
3082 static int do_set_interface(struct fsg_dev *fsg, int altsetting)
3086 const struct usb_endpoint_descriptor *d;
3089 DBG(fsg, "reset interface\n");
3092 /* Deallocate the requests */
3093 for (i = 0; i < NUM_BUFFERS; ++i) {
3094 struct fsg_buffhd *bh = &fsg->buffhds[i];
3097 usb_ep_free_request(fsg->bulk_in, bh->inreq);
3101 usb_ep_free_request(fsg->bulk_out, bh->outreq);
3106 usb_ep_free_request(fsg->intr_in, fsg->intreq);
3110 /* Disable the endpoints */
3111 if (fsg->bulk_in_enabled) {
3112 usb_ep_disable(fsg->bulk_in);
3113 fsg->bulk_in_enabled = 0;
3115 if (fsg->bulk_out_enabled) {
3116 usb_ep_disable(fsg->bulk_out);
3117 fsg->bulk_out_enabled = 0;
3119 if (fsg->intr_in_enabled) {
3120 usb_ep_disable(fsg->intr_in);
3121 fsg->intr_in_enabled = 0;
3125 if (altsetting < 0 || rc != 0)
3128 DBG(fsg, "set interface %d\n", altsetting);
3130 /* Enable the endpoints */
3131 d = ep_desc(fsg->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc);
3132 if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0)
3134 fsg->bulk_in_enabled = 1;
3136 d = ep_desc(fsg->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc);
3137 if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0)
3139 fsg->bulk_out_enabled = 1;
3140 fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize);
3142 if (transport_is_cbi()) {
3143 d = ep_desc(fsg->gadget, &fs_intr_in_desc, &hs_intr_in_desc);
3144 if ((rc = enable_endpoint(fsg, fsg->intr_in, d)) != 0)
3146 fsg->intr_in_enabled = 1;
3149 /* Allocate the requests */
3150 for (i = 0; i < NUM_BUFFERS; ++i) {
3151 struct fsg_buffhd *bh = &fsg->buffhds[i];
3153 if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
3155 if ((rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq)) != 0)
3157 bh->inreq->buf = bh->outreq->buf = bh->buf;
3158 bh->inreq->dma = bh->outreq->dma = bh->dma;
3159 bh->inreq->context = bh->outreq->context = bh;
3160 bh->inreq->complete = bulk_in_complete;
3161 bh->outreq->complete = bulk_out_complete;
3163 if (transport_is_cbi()) {
3164 if ((rc = alloc_request(fsg, fsg->intr_in, &fsg->intreq)) != 0)
3166 fsg->intreq->complete = intr_in_complete;
3170 for (i = 0; i < fsg->nluns; ++i)
3171 fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3177 * Change our operational configuration. This code must agree with the code
3178 * that returns config descriptors, and with interface altsetting code.
3180 * It's also responsible for power management interactions. Some
3181 * configurations might not work with our current power sources.
3182 * For now we just assume the gadget is always self-powered.
3184 static int do_set_config(struct fsg_dev *fsg, u8 new_config)
3188 /* Disable the single interface */
3189 if (fsg->config != 0) {
3190 DBG(fsg, "reset config\n");
3192 rc = do_set_interface(fsg, -1);
3195 /* Enable the interface */
3196 if (new_config != 0) {
3197 fsg->config = new_config;
3198 if ((rc = do_set_interface(fsg, 0)) != 0)
3199 fsg->config = 0; // Reset on errors
3203 switch (fsg->gadget->speed) {
3204 case USB_SPEED_LOW: speed = "low"; break;
3205 case USB_SPEED_FULL: speed = "full"; break;
3206 case USB_SPEED_HIGH: speed = "high"; break;
3207 default: speed = "?"; break;
3209 INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
3216 /*-------------------------------------------------------------------------*/
3218 static void handle_exception(struct fsg_dev *fsg)
3224 struct fsg_buffhd *bh;
3225 enum fsg_state old_state;
3228 unsigned int exception_req_tag;
3231 /* Clear the existing signals. Anything but SIGUSR1 is converted
3232 * into a high-priority EXIT exception. */
3234 sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
3238 if (sig != SIGUSR1) {
3239 if (fsg->state < FSG_STATE_EXIT)
3240 DBG(fsg, "Main thread exiting on signal\n");
3241 raise_exception(fsg, FSG_STATE_EXIT);
3245 /* Cancel all the pending transfers */
3246 if (fsg->intreq_busy)
3247 usb_ep_dequeue(fsg->intr_in, fsg->intreq);
3248 for (i = 0; i < NUM_BUFFERS; ++i) {
3249 bh = &fsg->buffhds[i];
3251 usb_ep_dequeue(fsg->bulk_in, bh->inreq);
3252 if (bh->outreq_busy)
3253 usb_ep_dequeue(fsg->bulk_out, bh->outreq);
3256 /* Wait until everything is idle */
3258 num_active = fsg->intreq_busy;
3259 for (i = 0; i < NUM_BUFFERS; ++i) {
3260 bh = &fsg->buffhds[i];
3261 num_active += bh->inreq_busy + bh->outreq_busy;
3263 if (num_active == 0)
3265 if (sleep_thread(fsg))
3269 /* Clear out the controller's fifos */
3270 if (fsg->bulk_in_enabled)
3271 usb_ep_fifo_flush(fsg->bulk_in);
3272 if (fsg->bulk_out_enabled)
3273 usb_ep_fifo_flush(fsg->bulk_out);
3274 if (fsg->intr_in_enabled)
3275 usb_ep_fifo_flush(fsg->intr_in);
3277 /* Reset the I/O buffer states and pointers, the SCSI
3278 * state, and the exception. Then invoke the handler. */
3279 spin_lock_irq(&fsg->lock);
3281 for (i = 0; i < NUM_BUFFERS; ++i) {
3282 bh = &fsg->buffhds[i];
3283 bh->state = BUF_STATE_EMPTY;
3285 fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain =
3288 exception_req_tag = fsg->exception_req_tag;
3289 new_config = fsg->new_config;
3290 old_state = fsg->state;
3292 if (old_state == FSG_STATE_ABORT_BULK_OUT)
3293 fsg->state = FSG_STATE_STATUS_PHASE;
3295 for (i = 0; i < fsg->nluns; ++i) {
3296 curlun = &fsg->luns[i];
3297 curlun->prevent_medium_removal = 0;
3298 curlun->sense_data = curlun->unit_attention_data =
3300 curlun->sense_data_info = 0;
3302 fsg->state = FSG_STATE_IDLE;
3304 spin_unlock_irq(&fsg->lock);
3306 /* Carry out any extra actions required for the exception */
3307 switch (old_state) {
3311 case FSG_STATE_ABORT_BULK_OUT:
3313 spin_lock_irq(&fsg->lock);
3314 if (fsg->state == FSG_STATE_STATUS_PHASE)
3315 fsg->state = FSG_STATE_IDLE;
3316 spin_unlock_irq(&fsg->lock);
3319 case FSG_STATE_RESET:
3320 /* In case we were forced against our will to halt a
3321 * bulk endpoint, clear the halt now. (The SuperH UDC
3322 * requires this.) */
3323 if (test_and_clear_bit(CLEAR_BULK_HALTS,
3324 &fsg->atomic_bitflags)) {
3325 usb_ep_clear_halt(fsg->bulk_in);
3326 usb_ep_clear_halt(fsg->bulk_out);
3329 if (transport_is_bbb()) {
3330 if (fsg->ep0_req_tag == exception_req_tag)
3331 ep0_queue(fsg); // Complete the status stage
3333 } else if (transport_is_cbi())
3334 send_status(fsg); // Status by interrupt pipe
3336 /* Technically this should go here, but it would only be
3337 * a waste of time. Ditto for the INTERFACE_CHANGE and
3338 * CONFIG_CHANGE cases. */
3339 // for (i = 0; i < fsg->nluns; ++i)
3340 // fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED;
3343 case FSG_STATE_INTERFACE_CHANGE:
3344 rc = do_set_interface(fsg, 0);
3345 if (fsg->ep0_req_tag != exception_req_tag)
3347 if (rc != 0) // STALL on errors
3348 fsg_set_halt(fsg, fsg->ep0);
3349 else // Complete the status stage
3353 case FSG_STATE_CONFIG_CHANGE:
3354 rc = do_set_config(fsg, new_config);
3355 if (fsg->ep0_req_tag != exception_req_tag)
3357 if (rc != 0) // STALL on errors
3358 fsg_set_halt(fsg, fsg->ep0);
3359 else // Complete the status stage
3363 case FSG_STATE_DISCONNECT:
3365 do_set_config(fsg, 0); // Unconfigured state
3368 case FSG_STATE_EXIT:
3369 case FSG_STATE_TERMINATED:
3370 do_set_config(fsg, 0); // Free resources
3371 spin_lock_irq(&fsg->lock);
3372 fsg->state = FSG_STATE_TERMINATED; // Stop the thread
3373 spin_unlock_irq(&fsg->lock);
3379 /*-------------------------------------------------------------------------*/
3381 static int fsg_main_thread(void *fsg_)
3383 struct fsg_dev *fsg = (struct fsg_dev *) fsg_;
3385 /* Allow the thread to be killed by a signal, but set the signal mask
3386 * to block everything but INT, TERM, KILL, and USR1. */
3387 siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
3388 sigmask(SIGTERM) | sigmask(SIGKILL) |
3390 sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
3392 /* Arrange for userspace references to be interpreted as kernel
3393 * pointers. That way we can pass a kernel pointer to a routine
3394 * that expects a __user pointer and it will work okay. */
3398 while (fsg->state != FSG_STATE_TERMINATED) {
3399 if (exception_in_progress(fsg) || signal_pending(current)) {
3400 handle_exception(fsg);
3404 if (!fsg->running) {
3409 if (get_next_command(fsg))
3412 spin_lock_irq(&fsg->lock);
3413 if (!exception_in_progress(fsg))
3414 fsg->state = FSG_STATE_DATA_PHASE;
3415 spin_unlock_irq(&fsg->lock);
3417 if (do_scsi_command(fsg) || finish_reply(fsg))
3420 spin_lock_irq(&fsg->lock);
3421 if (!exception_in_progress(fsg))
3422 fsg->state = FSG_STATE_STATUS_PHASE;
3423 spin_unlock_irq(&fsg->lock);
3425 if (send_status(fsg))
3428 spin_lock_irq(&fsg->lock);
3429 if (!exception_in_progress(fsg))
3430 fsg->state = FSG_STATE_IDLE;
3431 spin_unlock_irq(&fsg->lock);
3434 spin_lock_irq(&fsg->lock);
3435 fsg->thread_task = NULL;
3436 spin_unlock_irq(&fsg->lock);
3438 /* In case we are exiting because of a signal, unregister the
3439 * gadget driver and close the backing file. */
3440 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
3441 usb_gadget_unregister_driver(&fsg_driver);
3442 close_all_backing_files(fsg);
3445 /* Let the unbind and cleanup routines know the thread has exited */
3446 complete_and_exit(&fsg->thread_notifier, 0);
3450 /*-------------------------------------------------------------------------*/
3452 /* If the next two routines are called while the gadget is registered,
3453 * the caller must own fsg->filesem for writing. */
3455 static int open_backing_file(struct lun *curlun, const char *filename)
3458 struct file *filp = NULL;
3460 struct inode *inode = NULL;
3464 /* R/W if we can, R/O if we must */
3467 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
3468 if (-EROFS == PTR_ERR(filp))
3472 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
3474 LINFO(curlun, "unable to open backing file: %s\n", filename);
3475 return PTR_ERR(filp);
3478 if (!(filp->f_mode & FMODE_WRITE))
3482 inode = filp->f_dentry->d_inode;
3483 if (inode && S_ISBLK(inode->i_mode)) {
3484 if (bdev_read_only(inode->i_bdev))
3486 } else if (!inode || !S_ISREG(inode->i_mode)) {
3487 LINFO(curlun, "invalid file type: %s\n", filename);
3491 /* If we can't read the file, it's no good.
3492 * If we can't write the file, use it read-only. */
3493 if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
3494 LINFO(curlun, "file not readable: %s\n", filename);
3497 if (!(filp->f_op->write || filp->f_op->aio_write))
3500 size = i_size_read(inode->i_mapping->host);
3502 LINFO(curlun, "unable to find file size: %s\n", filename);
3506 num_sectors = size >> 9; // File size in 512-byte sectors
3507 if (num_sectors == 0) {
3508 LINFO(curlun, "file too small: %s\n", filename);
3515 curlun->filp = filp;
3516 curlun->file_length = size;
3517 curlun->num_sectors = num_sectors;
3518 LDBG(curlun, "open backing file: %s\n", filename);
3522 filp_close(filp, current->files);
3527 static void close_backing_file(struct lun *curlun)
3530 LDBG(curlun, "close backing file\n");
3532 curlun->filp = NULL;
3536 static void close_all_backing_files(struct fsg_dev *fsg)
3540 for (i = 0; i < fsg->nluns; ++i)
3541 close_backing_file(&fsg->luns[i]);
3545 static ssize_t show_ro(struct device *dev, struct device_attribute *attr, char *buf)
3547 struct lun *curlun = dev_to_lun(dev);
3549 return sprintf(buf, "%d\n", curlun->ro);
3552 static ssize_t show_file(struct device *dev, struct device_attribute *attr, char *buf)
3554 struct lun *curlun = dev_to_lun(dev);
3555 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3559 down_read(&fsg->filesem);
3560 if (backing_file_is_open(curlun)) { // Get the complete pathname
3561 p = d_path(curlun->filp->f_dentry, curlun->filp->f_vfsmnt,
3562 buf, PAGE_SIZE - 1);
3567 memmove(buf, p, rc);
3568 buf[rc] = '\n'; // Add a newline
3571 } else { // No file, return 0 bytes
3575 up_read(&fsg->filesem);
3580 static ssize_t store_ro(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3583 struct lun *curlun = dev_to_lun(dev);
3584 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3587 if (sscanf(buf, "%d", &i) != 1)
3590 /* Allow the write-enable status to change only while the backing file
3592 down_read(&fsg->filesem);
3593 if (backing_file_is_open(curlun)) {
3594 LDBG(curlun, "read-only status change prevented\n");
3598 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
3600 up_read(&fsg->filesem);
3604 static ssize_t store_file(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3606 struct lun *curlun = dev_to_lun(dev);
3607 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3610 if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) {
3611 LDBG(curlun, "eject attempt prevented\n");
3612 return -EBUSY; // "Door is locked"
3615 /* Remove a trailing newline */
3616 if (count > 0 && buf[count-1] == '\n')
3617 ((char *) buf)[count-1] = 0; // Ugh!
3619 /* Eject current medium */
3620 down_write(&fsg->filesem);
3621 if (backing_file_is_open(curlun)) {
3622 close_backing_file(curlun);
3623 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
3626 /* Load new medium */
3627 if (count > 0 && buf[0]) {
3628 rc = open_backing_file(curlun, buf);
3630 curlun->unit_attention_data =
3631 SS_NOT_READY_TO_READY_TRANSITION;
3633 up_write(&fsg->filesem);
3634 return (rc < 0 ? rc : count);
3638 /* The write permissions and store_xxx pointers are set in fsg_bind() */
3639 static DEVICE_ATTR(ro, 0444, show_ro, NULL);
3640 static DEVICE_ATTR(file, 0444, show_file, NULL);
3643 /*-------------------------------------------------------------------------*/
3645 static void lun_release(struct device *dev)
3647 struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev);
3649 complete(&fsg->lun_released);
3652 static void fsg_unbind(struct usb_gadget *gadget)
3654 struct fsg_dev *fsg = get_gadget_data(gadget);
3657 struct usb_request *req = fsg->ep0req;
3659 DBG(fsg, "unbind\n");
3660 clear_bit(REGISTERED, &fsg->atomic_bitflags);
3662 /* Unregister the sysfs attribute files and the LUNs */
3663 init_completion(&fsg->lun_released);
3664 for (i = 0; i < fsg->nluns; ++i) {
3665 curlun = &fsg->luns[i];
3666 if (curlun->registered) {
3667 device_remove_file(&curlun->dev, &dev_attr_ro);
3668 device_remove_file(&curlun->dev, &dev_attr_file);
3669 device_unregister(&curlun->dev);
3670 wait_for_completion(&fsg->lun_released);
3671 curlun->registered = 0;
3675 /* If the thread isn't already dead, tell it to exit now */
3676 if (fsg->state != FSG_STATE_TERMINATED) {
3677 raise_exception(fsg, FSG_STATE_EXIT);
3678 wait_for_completion(&fsg->thread_notifier);
3680 /* The cleanup routine waits for this completion also */
3681 complete(&fsg->thread_notifier);
3684 /* Free the data buffers */
3685 for (i = 0; i < NUM_BUFFERS; ++i) {
3686 struct fsg_buffhd *bh = &fsg->buffhds[i];
3689 usb_ep_free_buffer(fsg->bulk_in, bh->buf, bh->dma,
3693 /* Free the request and buffer for endpoint 0 */
3696 usb_ep_free_buffer(fsg->ep0, req->buf,
3697 req->dma, EP0_BUFSIZE);
3698 usb_ep_free_request(fsg->ep0, req);
3701 set_gadget_data(gadget, NULL);
3705 static int __init check_parameters(struct fsg_dev *fsg)
3710 /* Store the default values */
3711 mod_data.transport_type = USB_PR_BULK;
3712 mod_data.transport_name = "Bulk-only";
3713 mod_data.protocol_type = USB_SC_SCSI;
3714 mod_data.protocol_name = "Transparent SCSI";
3716 if (gadget_is_sh(fsg->gadget))
3717 mod_data.can_stall = 0;
3719 if (mod_data.release == 0xffff) { // Parameter wasn't set
3720 /* The sa1100 controller is not supported */
3721 if (gadget_is_sa1100(fsg->gadget))
3724 gcnum = usb_gadget_controller_number(fsg->gadget);
3726 mod_data.release = 0x0300 + gcnum;
3728 WARN(fsg, "controller '%s' not recognized\n",
3730 mod_data.release = 0x0399;
3734 prot = simple_strtol(mod_data.protocol_parm, NULL, 0);
3736 #ifdef CONFIG_USB_FILE_STORAGE_TEST
3737 if (strnicmp(mod_data.transport_parm, "BBB", 10) == 0) {
3738 ; // Use default setting
3739 } else if (strnicmp(mod_data.transport_parm, "CB", 10) == 0) {
3740 mod_data.transport_type = USB_PR_CB;
3741 mod_data.transport_name = "Control-Bulk";
3742 } else if (strnicmp(mod_data.transport_parm, "CBI", 10) == 0) {
3743 mod_data.transport_type = USB_PR_CBI;
3744 mod_data.transport_name = "Control-Bulk-Interrupt";
3746 ERROR(fsg, "invalid transport: %s\n", mod_data.transport_parm);
3750 if (strnicmp(mod_data.protocol_parm, "SCSI", 10) == 0 ||
3751 prot == USB_SC_SCSI) {
3752 ; // Use default setting
3753 } else if (strnicmp(mod_data.protocol_parm, "RBC", 10) == 0 ||
3754 prot == USB_SC_RBC) {
3755 mod_data.protocol_type = USB_SC_RBC;
3756 mod_data.protocol_name = "RBC";
3757 } else if (strnicmp(mod_data.protocol_parm, "8020", 4) == 0 ||
3758 strnicmp(mod_data.protocol_parm, "ATAPI", 10) == 0 ||
3759 prot == USB_SC_8020) {
3760 mod_data.protocol_type = USB_SC_8020;
3761 mod_data.protocol_name = "8020i (ATAPI)";
3762 } else if (strnicmp(mod_data.protocol_parm, "QIC", 3) == 0 ||
3763 prot == USB_SC_QIC) {
3764 mod_data.protocol_type = USB_SC_QIC;
3765 mod_data.protocol_name = "QIC-157";
3766 } else if (strnicmp(mod_data.protocol_parm, "UFI", 10) == 0 ||
3767 prot == USB_SC_UFI) {
3768 mod_data.protocol_type = USB_SC_UFI;
3769 mod_data.protocol_name = "UFI";
3770 } else if (strnicmp(mod_data.protocol_parm, "8070", 4) == 0 ||
3771 prot == USB_SC_8070) {
3772 mod_data.protocol_type = USB_SC_8070;
3773 mod_data.protocol_name = "8070i";
3775 ERROR(fsg, "invalid protocol: %s\n", mod_data.protocol_parm);
3779 mod_data.buflen &= PAGE_CACHE_MASK;
3780 if (mod_data.buflen <= 0) {
3781 ERROR(fsg, "invalid buflen\n");
3784 #endif /* CONFIG_USB_FILE_STORAGE_TEST */
3790 static int __init fsg_bind(struct usb_gadget *gadget)
3792 struct fsg_dev *fsg = the_fsg;
3797 struct usb_request *req;
3800 fsg->gadget = gadget;
3801 set_gadget_data(gadget, fsg);
3802 fsg->ep0 = gadget->ep0;
3803 fsg->ep0->driver_data = fsg;
3805 if ((rc = check_parameters(fsg)) != 0)
3808 if (mod_data.removable) { // Enable the store_xxx attributes
3809 dev_attr_ro.attr.mode = dev_attr_file.attr.mode = 0644;
3810 dev_attr_ro.store = store_ro;
3811 dev_attr_file.store = store_file;
3814 /* Find out how many LUNs there should be */
3817 i = max(mod_data.num_filenames, 1);
3819 ERROR(fsg, "invalid number of LUNs: %d\n", i);
3824 /* Create the LUNs, open their backing files, and register the
3825 * LUN devices in sysfs. */
3826 fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL);
3833 for (i = 0; i < fsg->nluns; ++i) {
3834 curlun = &fsg->luns[i];
3836 curlun->dev.parent = &gadget->dev;
3837 curlun->dev.driver = &fsg_driver.driver;
3838 dev_set_drvdata(&curlun->dev, fsg);
3839 snprintf(curlun->dev.bus_id, BUS_ID_SIZE,
3840 "%s-lun%d", gadget->dev.bus_id, i);
3842 if ((rc = device_register(&curlun->dev)) != 0)
3843 INFO(fsg, "failed to register LUN%d: %d\n", i, rc);
3845 curlun->registered = 1;
3846 curlun->dev.release = lun_release;
3847 device_create_file(&curlun->dev, &dev_attr_ro);
3848 device_create_file(&curlun->dev, &dev_attr_file);
3851 if (file[i] && *file[i]) {
3852 if ((rc = open_backing_file(curlun, file[i])) != 0)
3854 } else if (!mod_data.removable) {
3855 ERROR(fsg, "no file given for LUN%d\n", i);
3861 /* Find all the endpoints we will use */
3862 usb_ep_autoconfig_reset(gadget);
3863 ep = usb_ep_autoconfig(gadget, &fs_bulk_in_desc);
3866 ep->driver_data = fsg; // claim the endpoint
3869 ep = usb_ep_autoconfig(gadget, &fs_bulk_out_desc);
3872 ep->driver_data = fsg; // claim the endpoint
3875 if (transport_is_cbi()) {
3876 ep = usb_ep_autoconfig(gadget, &fs_intr_in_desc);
3879 ep->driver_data = fsg; // claim the endpoint
3883 /* Fix up the descriptors */
3884 device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
3885 device_desc.idVendor = cpu_to_le16(mod_data.vendor);
3886 device_desc.idProduct = cpu_to_le16(mod_data.product);
3887 device_desc.bcdDevice = cpu_to_le16(mod_data.release);
3889 i = (transport_is_cbi() ? 3 : 2); // Number of endpoints
3890 intf_desc.bNumEndpoints = i;
3891 intf_desc.bInterfaceSubClass = mod_data.protocol_type;
3892 intf_desc.bInterfaceProtocol = mod_data.transport_type;
3893 fs_function[i + FS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3895 #ifdef CONFIG_USB_GADGET_DUALSPEED
3896 hs_function[i + HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
3898 /* Assume ep0 uses the same maxpacket value for both speeds */
3899 dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
3901 /* Assume that all endpoint addresses are the same for both speeds */
3902 hs_bulk_in_desc.bEndpointAddress = fs_bulk_in_desc.bEndpointAddress;
3903 hs_bulk_out_desc.bEndpointAddress = fs_bulk_out_desc.bEndpointAddress;
3904 hs_intr_in_desc.bEndpointAddress = fs_intr_in_desc.bEndpointAddress;
3907 if (gadget->is_otg) {
3908 otg_desc.bmAttributes |= USB_OTG_HNP,
3909 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
3914 /* Allocate the request and buffer for endpoint 0 */
3915 fsg->ep0req = req = usb_ep_alloc_request(fsg->ep0, GFP_KERNEL);
3918 req->buf = usb_ep_alloc_buffer(fsg->ep0, EP0_BUFSIZE,
3919 &req->dma, GFP_KERNEL);
3922 req->complete = ep0_complete;
3924 /* Allocate the data buffers */
3925 for (i = 0; i < NUM_BUFFERS; ++i) {
3926 struct fsg_buffhd *bh = &fsg->buffhds[i];
3928 bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
3929 &bh->dma, GFP_KERNEL);
3934 fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0];
3936 /* This should reflect the actual gadget power source */
3937 usb_gadget_set_selfpowered(gadget);
3939 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
3940 system_utsname.sysname, system_utsname.release,
3943 /* On a real device, serial[] would be loaded from permanent
3944 * storage. We just encode it from the driver version string. */
3945 for (i = 0; i < sizeof(serial) - 2; i += 2) {
3946 unsigned char c = DRIVER_VERSION[i / 2];
3950 sprintf(&serial[i], "%02X", c);
3953 fsg->thread_task = kthread_create(fsg_main_thread, fsg,
3954 "file-storage-gadget");
3955 if (IS_ERR(fsg->thread_task)) {
3956 rc = PTR_ERR(fsg->thread_task);
3960 INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
3961 INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
3963 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
3964 for (i = 0; i < fsg->nluns; ++i) {
3965 curlun = &fsg->luns[i];
3966 if (backing_file_is_open(curlun)) {
3969 p = d_path(curlun->filp->f_dentry,
3970 curlun->filp->f_vfsmnt,
3975 LINFO(curlun, "ro=%d, file: %s\n",
3976 curlun->ro, (p ? p : "(error)"));
3981 DBG(fsg, "transport=%s (x%02x)\n",
3982 mod_data.transport_name, mod_data.transport_type);
3983 DBG(fsg, "protocol=%s (x%02x)\n",
3984 mod_data.protocol_name, mod_data.protocol_type);
3985 DBG(fsg, "VendorID=x%04x, ProductID=x%04x, Release=x%04x\n",
3986 mod_data.vendor, mod_data.product, mod_data.release);
3987 DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
3988 mod_data.removable, mod_data.can_stall,
3990 DBG(fsg, "I/O thread pid: %d\n", fsg->thread_task->pid);
3992 set_bit(REGISTERED, &fsg->atomic_bitflags);
3994 /* Tell the thread to start working */
3995 wake_up_process(fsg->thread_task);
3999 ERROR(fsg, "unable to autoconfigure all endpoints\n");
4003 fsg->state = FSG_STATE_TERMINATED; // The thread is dead
4005 close_all_backing_files(fsg);
4010 /*-------------------------------------------------------------------------*/
4012 static void fsg_suspend(struct usb_gadget *gadget)
4014 struct fsg_dev *fsg = get_gadget_data(gadget);
4016 DBG(fsg, "suspend\n");
4017 set_bit(SUSPENDED, &fsg->atomic_bitflags);
4020 static void fsg_resume(struct usb_gadget *gadget)
4022 struct fsg_dev *fsg = get_gadget_data(gadget);
4024 DBG(fsg, "resume\n");
4025 clear_bit(SUSPENDED, &fsg->atomic_bitflags);
4029 /*-------------------------------------------------------------------------*/
4031 static struct usb_gadget_driver fsg_driver = {
4032 #ifdef CONFIG_USB_GADGET_DUALSPEED
4033 .speed = USB_SPEED_HIGH,
4035 .speed = USB_SPEED_FULL,
4037 .function = (char *) longname,
4039 .unbind = fsg_unbind,
4040 .disconnect = fsg_disconnect,
4042 .suspend = fsg_suspend,
4043 .resume = fsg_resume,
4046 .name = (char *) shortname,
4047 .owner = THIS_MODULE,
4055 static int __init fsg_alloc(void)
4057 struct fsg_dev *fsg;
4059 fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
4062 spin_lock_init(&fsg->lock);
4063 init_rwsem(&fsg->filesem);
4064 init_waitqueue_head(&fsg->thread_wqh);
4065 init_completion(&fsg->thread_notifier);
4072 static void fsg_free(struct fsg_dev *fsg)
4079 static int __init fsg_init(void)
4082 struct fsg_dev *fsg;
4084 if ((rc = fsg_alloc()) != 0)
4087 if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0)
4091 module_init(fsg_init);
4094 static void __exit fsg_cleanup(void)
4096 struct fsg_dev *fsg = the_fsg;
4098 /* Unregister the driver iff the thread hasn't already done so */
4099 if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
4100 usb_gadget_unregister_driver(&fsg_driver);
4102 /* Wait for the thread to finish up */
4103 wait_for_completion(&fsg->thread_notifier);
4105 close_all_backing_files(fsg);
4108 module_exit(fsg_cleanup);
projects / linux-2.6 / blob