2 * f_mass_storage.c -- Mass Storage USB Composite Function
4 * Copyright (C) 2003-2008 Alan Stern
5 * Copyright (C) 2009 Samsung Electronics
6 * Author: Michal Nazarewicz <mina86@mina86.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The names of the above-listed copyright holders may not be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * ALTERNATIVELY, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") as published by the Free Software
24 * Foundation, either version 2 of that License or (at your option) any
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
28 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
29 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
31 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
32 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
33 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
34 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
35 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
36 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
37 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 * The Mass Storage Function acts as a USB Mass Storage device,
42 * appearing to the host as a disk drive or as a CD-ROM drive. In
43 * addition to providing an example of a genuinely useful composite
44 * function for a USB device, it also illustrates a technique of
45 * double-buffering for increased throughput.
47 * For more information about MSF and in particular its module
48 * parameters and sysfs interface read the
49 * <Documentation/usb/mass-storage.txt> file.
53 * MSF is configured by specifying a fsg_config structure. It has the
56 * nluns Number of LUNs function have (anywhere from 1
57 * to FSG_MAX_LUNS which is 8).
58 * luns An array of LUN configuration values. This
59 * should be filled for each LUN that
60 * function will include (ie. for "nluns"
61 * LUNs). Each element of the array has
62 * the following fields:
63 * ->filename The path to the backing file for the LUN.
64 * Required if LUN is not marked as
66 * ->ro Flag specifying access to the LUN shall be
67 * read-only. This is implied if CD-ROM
68 * emulation is enabled as well as when
69 * it was impossible to open "filename"
71 * ->removable Flag specifying that LUN shall be indicated as
73 * ->cdrom Flag specifying that LUN shall be reported as
75 * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12)
76 * commands for this LUN shall be ignored.
80 * release Information used as a reply to INQUIRY
81 * request. To use default set to NULL,
82 * NULL, 0xffff respectively. The first
83 * field should be 8 and the second 16
86 * can_stall Set to permit function to halt bulk endpoints.
87 * Disabled on some USB devices known not
88 * to work correctly. You should set it
91 * If "removable" is not set for a LUN then a backing file must be
92 * specified. If it is set, then NULL filename means the LUN's medium
93 * is not loaded (an empty string as "filename" in the fsg_config
94 * structure causes error). The CD-ROM emulation includes a single
95 * data track and no audio tracks; hence there need be only one
96 * backing file per LUN.
98 * This function is heavily based on "File-backed Storage Gadget" by
99 * Alan Stern which in turn is heavily based on "Gadget Zero" by David
100 * Brownell. The driver's SCSI command interface was based on the
101 * "Information technology - Small Computer System Interface - 2"
102 * document from X3T9.2 Project 375D, Revision 10L, 7-SEP-93,
103 * available at <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>.
104 * The single exception is opcode 0x23 (READ FORMAT CAPACITIES), which
105 * was based on the "Universal Serial Bus Mass Storage Class UFI
106 * Command Specification" document, Revision 1.0, December 14, 1998,
108 * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
114 * The MSF is fairly straightforward. There is a main kernel
115 * thread that handles most of the work. Interrupt routines field
116 * callbacks from the controller driver: bulk- and interrupt-request
117 * completion notifications, endpoint-0 events, and disconnect events.
118 * Completion events are passed to the main thread by wakeup calls. Many
119 * ep0 requests are handled at interrupt time, but SetInterface,
120 * SetConfiguration, and device reset requests are forwarded to the
121 * thread in the form of "exceptions" using SIGUSR1 signals (since they
122 * should interrupt any ongoing file I/O operations).
124 * The thread's main routine implements the standard command/data/status
125 * parts of a SCSI interaction. It and its subroutines are full of tests
126 * for pending signals/exceptions -- all this polling is necessary since
127 * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
128 * indication that the driver really wants to be running in userspace.)
129 * An important point is that so long as the thread is alive it keeps an
130 * open reference to the backing file. This will prevent unmounting
131 * the backing file's underlying filesystem and could cause problems
132 * during system shutdown, for example. To prevent such problems, the
133 * thread catches INT, TERM, and KILL signals and converts them into
136 * In normal operation the main thread is started during the gadget's
137 * fsg_bind() callback and stopped during fsg_unbind(). But it can
138 * also exit when it receives a signal, and there's no point leaving
139 * the gadget running when the thread is dead. As of this moment, MSF
140 * provides no way to deregister the gadget when thread dies -- maybe
141 * a callback functions is needed.
143 * To provide maximum throughput, the driver uses a circular pipeline of
144 * buffer heads (struct fsg_buffhd). In principle the pipeline can be
145 * arbitrarily long; in practice the benefits don't justify having more
146 * than 2 stages (i.e., double buffering). But it helps to think of the
147 * pipeline as being a long one. Each buffer head contains a bulk-in and
148 * a bulk-out request pointer (since the buffer can be used for both
149 * output and input -- directions always are given from the host's
150 * point of view) as well as a pointer to the buffer and various state
153 * Use of the pipeline follows a simple protocol. There is a variable
154 * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
155 * At any time that buffer head may still be in use from an earlier
156 * request, so each buffer head has a state variable indicating whether
157 * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
158 * buffer head to be EMPTY, filling the buffer either by file I/O or by
159 * USB I/O (during which the buffer head is BUSY), and marking the buffer
160 * head FULL when the I/O is complete. Then the buffer will be emptied
161 * (again possibly by USB I/O, during which it is marked BUSY) and
162 * finally marked EMPTY again (possibly by a completion routine).
164 * A module parameter tells the driver to avoid stalling the bulk
165 * endpoints wherever the transport specification allows. This is
166 * necessary for some UDCs like the SuperH, which cannot reliably clear a
167 * halt on a bulk endpoint. However, under certain circumstances the
168 * Bulk-only specification requires a stall. In such cases the driver
169 * will halt the endpoint and set a flag indicating that it should clear
170 * the halt in software during the next device reset. Hopefully this
171 * will permit everything to work correctly. Furthermore, although the
172 * specification allows the bulk-out endpoint to halt when the host sends
173 * too much data, implementing this would cause an unavoidable race.
174 * The driver will always use the "no-stall" approach for OUT transfers.
176 * One subtle point concerns sending status-stage responses for ep0
177 * requests. Some of these requests, such as device reset, can involve
178 * interrupting an ongoing file I/O operation, which might take an
179 * arbitrarily long time. During that delay the host might give up on
180 * the original ep0 request and issue a new one. When that happens the
181 * driver should not notify the host about completion of the original
182 * request, as the host will no longer be waiting for it. So the driver
183 * assigns to each ep0 request a unique tag, and it keeps track of the
184 * tag value of the request associated with a long-running exception
185 * (device-reset, interface-change, or configuration-change). When the
186 * exception handler is finished, the status-stage response is submitted
187 * only if the current ep0 request tag is equal to the exception request
188 * tag. Thus only the most recently received ep0 request will get a
189 * status-stage response.
191 * Warning: This driver source file is too long. It ought to be split up
192 * into a header file plus about 3 separate .c files, to handle the details
193 * of the Gadget, USB Mass Storage, and SCSI protocols.
197 /* #define VERBOSE_DEBUG */
198 /* #define DUMP_MSGS */
200 #include <linux/blkdev.h>
201 #include <linux/completion.h>
202 #include <linux/dcache.h>
203 #include <linux/delay.h>
204 #include <linux/device.h>
205 #include <linux/fcntl.h>
206 #include <linux/file.h>
207 #include <linux/fs.h>
208 #include <linux/kref.h>
209 #include <linux/kthread.h>
210 #include <linux/limits.h>
211 #include <linux/rwsem.h>
212 #include <linux/slab.h>
213 #include <linux/spinlock.h>
214 #include <linux/string.h>
215 #include <linux/freezer.h>
216 #include <linux/utsname.h>
218 #include <linux/usb/ch9.h>
219 #include <linux/usb/gadget.h>
220 #include <linux/usb/composite.h>
222 #include "gadget_chips.h"
225 /*------------------------------------------------------------------------*/
227 #define FSG_DRIVER_DESC "Mass Storage Function"
228 #define FSG_DRIVER_VERSION "2009/09/11"
230 static const char fsg_string_interface
[] = "Mass Storage";
232 #define FSG_NO_DEVICE_STRINGS 1
234 #define FSG_NO_INTR_EP 1
236 #include "storage_common.c"
239 /*-------------------------------------------------------------------------*/
244 /* FSF callback functions */
245 struct fsg_operations
{
247 * Callback function to call when thread exits. If no
248 * callback is set or it returns value lower then zero MSF
249 * will force eject all LUNs it operates on (including those
250 * marked as non-removable or with prevent_medium_removal flag
253 int (*thread_exits
)(struct fsg_common
*common
);
256 * Called prior to ejection. Negative return means error,
257 * zero means to continue with ejection, positive means not to
260 int (*pre_eject
)(struct fsg_common
*common
,
261 struct fsg_lun
*lun
, int num
);
263 * Called after ejection. Negative return means error, zero
264 * or positive is just a success.
266 int (*post_eject
)(struct fsg_common
*common
,
267 struct fsg_lun
*lun
, int num
);
270 /* Data shared by all the FSG instances. */
272 struct usb_gadget
*gadget
;
273 struct usb_composite_dev
*cdev
;
274 struct fsg_dev
*fsg
, *new_fsg
;
275 wait_queue_head_t fsg_wait
;
277 /* filesem protects: backing files in use */
278 struct rw_semaphore filesem
;
280 /* lock protects: state, all the req_busy's */
283 struct usb_ep
*ep0
; /* Copy of gadget->ep0 */
284 struct usb_request
*ep0req
; /* Copy of cdev->req */
285 unsigned int ep0_req_tag
;
287 struct fsg_buffhd
*next_buffhd_to_fill
;
288 struct fsg_buffhd
*next_buffhd_to_drain
;
289 struct fsg_buffhd
*buffhds
;
292 u8 cmnd
[MAX_COMMAND_SIZE
];
296 struct fsg_lun
*luns
;
297 struct fsg_lun
*curlun
;
299 unsigned int bulk_out_maxpacket
;
300 enum fsg_state state
; /* For exception handling */
301 unsigned int exception_req_tag
;
303 enum data_direction data_dir
;
305 u32 data_size_from_cmnd
;
310 unsigned int can_stall
:1;
311 unsigned int free_storage_on_release
:1;
312 unsigned int phase_error
:1;
313 unsigned int short_packet_received
:1;
314 unsigned int bad_lun_okay
:1;
315 unsigned int running
:1;
317 int thread_wakeup_needed
;
318 struct completion thread_notifier
;
319 struct task_struct
*thread_task
;
321 /* Callback functions. */
322 const struct fsg_operations
*ops
;
323 /* Gadget's private data. */
327 * Vendor (8 chars), product (16 chars), release (4
328 * hexadecimal digits) and NUL byte
330 char inquiry_string
[8 + 16 + 4 + 1];
337 struct fsg_lun_config
{
338 const char *filename
;
343 } luns
[FSG_MAX_LUNS
];
345 /* Callback functions. */
346 const struct fsg_operations
*ops
;
347 /* Gadget's private data. */
350 const char *vendor_name
; /* 8 characters or less */
351 const char *product_name
; /* 16 characters or less */
358 struct usb_function function
;
359 struct usb_gadget
*gadget
; /* Copy of cdev->gadget */
360 struct fsg_common
*common
;
362 u16 interface_number
;
364 unsigned int bulk_in_enabled
:1;
365 unsigned int bulk_out_enabled
:1;
367 unsigned long atomic_bitflags
;
368 #define IGNORE_BULK_OUT 0
370 struct usb_ep
*bulk_in
;
371 struct usb_ep
*bulk_out
;
374 static inline int __fsg_is_set(struct fsg_common
*common
,
375 const char *func
, unsigned line
)
379 ERROR(common
, "common->fsg is NULL in %s at %u\n", func
, line
);
384 #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__))
386 static inline struct fsg_dev
*fsg_from_func(struct usb_function
*f
)
388 return container_of(f
, struct fsg_dev
, function
);
391 typedef void (*fsg_routine_t
)(struct fsg_dev
*);
393 static int exception_in_progress(struct fsg_common
*common
)
395 return common
->state
> FSG_STATE_IDLE
;
398 /* Make bulk-out requests be divisible by the maxpacket size */
399 static void set_bulk_out_req_length(struct fsg_common
*common
,
400 struct fsg_buffhd
*bh
, unsigned int length
)
404 bh
->bulk_out_intended_length
= length
;
405 rem
= length
% common
->bulk_out_maxpacket
;
407 length
+= common
->bulk_out_maxpacket
- rem
;
408 bh
->outreq
->length
= length
;
412 /*-------------------------------------------------------------------------*/
414 static int fsg_set_halt(struct fsg_dev
*fsg
, struct usb_ep
*ep
)
418 if (ep
== fsg
->bulk_in
)
420 else if (ep
== fsg
->bulk_out
)
424 DBG(fsg
, "%s set halt\n", name
);
425 return usb_ep_set_halt(ep
);
429 /*-------------------------------------------------------------------------*/
431 /* These routines may be called in process context or in_irq */
433 /* Caller must hold fsg->lock */
434 static void wakeup_thread(struct fsg_common
*common
)
436 /* Tell the main thread that something has happened */
437 common
->thread_wakeup_needed
= 1;
438 if (common
->thread_task
)
439 wake_up_process(common
->thread_task
);
442 static void raise_exception(struct fsg_common
*common
, enum fsg_state new_state
)
447 * Do nothing if a higher-priority exception is already in progress.
448 * If a lower-or-equal priority exception is in progress, preempt it
449 * and notify the main thread by sending it a signal.
451 spin_lock_irqsave(&common
->lock
, flags
);
452 if (common
->state
<= new_state
) {
453 common
->exception_req_tag
= common
->ep0_req_tag
;
454 common
->state
= new_state
;
455 if (common
->thread_task
)
456 send_sig_info(SIGUSR1
, SEND_SIG_FORCED
,
457 common
->thread_task
);
459 spin_unlock_irqrestore(&common
->lock
, flags
);
463 /*-------------------------------------------------------------------------*/
465 static int ep0_queue(struct fsg_common
*common
)
469 rc
= usb_ep_queue(common
->ep0
, common
->ep0req
, GFP_ATOMIC
);
470 common
->ep0
->driver_data
= common
;
471 if (rc
!= 0 && rc
!= -ESHUTDOWN
) {
472 /* We can't do much more than wait for a reset */
473 WARNING(common
, "error in submission: %s --> %d\n",
474 common
->ep0
->name
, rc
);
480 /*-------------------------------------------------------------------------*/
482 /* Completion handlers. These always run in_irq. */
484 static void bulk_in_complete(struct usb_ep
*ep
, struct usb_request
*req
)
486 struct fsg_common
*common
= ep
->driver_data
;
487 struct fsg_buffhd
*bh
= req
->context
;
489 if (req
->status
|| req
->actual
!= req
->length
)
490 DBG(common
, "%s --> %d, %u/%u\n", __func__
,
491 req
->status
, req
->actual
, req
->length
);
492 if (req
->status
== -ECONNRESET
) /* Request was cancelled */
493 usb_ep_fifo_flush(ep
);
495 /* Hold the lock while we update the request and buffer states */
497 spin_lock(&common
->lock
);
499 bh
->state
= BUF_STATE_EMPTY
;
500 wakeup_thread(common
);
501 spin_unlock(&common
->lock
);
504 static void bulk_out_complete(struct usb_ep
*ep
, struct usb_request
*req
)
506 struct fsg_common
*common
= ep
->driver_data
;
507 struct fsg_buffhd
*bh
= req
->context
;
509 dump_msg(common
, "bulk-out", req
->buf
, req
->actual
);
510 if (req
->status
|| req
->actual
!= bh
->bulk_out_intended_length
)
511 DBG(common
, "%s --> %d, %u/%u\n", __func__
,
512 req
->status
, req
->actual
, bh
->bulk_out_intended_length
);
513 if (req
->status
== -ECONNRESET
) /* Request was cancelled */
514 usb_ep_fifo_flush(ep
);
516 /* Hold the lock while we update the request and buffer states */
518 spin_lock(&common
->lock
);
520 bh
->state
= BUF_STATE_FULL
;
521 wakeup_thread(common
);
522 spin_unlock(&common
->lock
);
525 static int fsg_setup(struct usb_function
*f
,
526 const struct usb_ctrlrequest
*ctrl
)
528 struct fsg_dev
*fsg
= fsg_from_func(f
);
529 struct usb_request
*req
= fsg
->common
->ep0req
;
530 u16 w_index
= le16_to_cpu(ctrl
->wIndex
);
531 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
532 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
534 if (!fsg_is_set(fsg
->common
))
537 ++fsg
->common
->ep0_req_tag
; /* Record arrival of a new request */
540 dump_msg(fsg
, "ep0-setup", (u8
*) ctrl
, sizeof(*ctrl
));
542 switch (ctrl
->bRequest
) {
544 case US_BULK_RESET_REQUEST
:
545 if (ctrl
->bRequestType
!=
546 (USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
))
548 if (w_index
!= fsg
->interface_number
|| w_value
!= 0 ||
553 * Raise an exception to stop the current operation
554 * and reinitialize our state.
556 DBG(fsg
, "bulk reset request\n");
557 raise_exception(fsg
->common
, FSG_STATE_RESET
);
558 return DELAYED_STATUS
;
560 case US_BULK_GET_MAX_LUN
:
561 if (ctrl
->bRequestType
!=
562 (USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
))
564 if (w_index
!= fsg
->interface_number
|| w_value
!= 0 ||
567 VDBG(fsg
, "get max LUN\n");
568 *(u8
*)req
->buf
= fsg
->common
->nluns
- 1;
570 /* Respond with data/status */
571 req
->length
= min((u16
)1, w_length
);
572 return ep0_queue(fsg
->common
);
576 "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n",
577 ctrl
->bRequestType
, ctrl
->bRequest
,
578 le16_to_cpu(ctrl
->wValue
), w_index
, w_length
);
583 /*-------------------------------------------------------------------------*/
585 /* All the following routines run in process context */
587 /* Use this for bulk or interrupt transfers, not ep0 */
588 static void start_transfer(struct fsg_dev
*fsg
, struct usb_ep
*ep
,
589 struct usb_request
*req
, int *pbusy
,
590 enum fsg_buffer_state
*state
)
594 if (ep
== fsg
->bulk_in
)
595 dump_msg(fsg
, "bulk-in", req
->buf
, req
->length
);
597 spin_lock_irq(&fsg
->common
->lock
);
599 *state
= BUF_STATE_BUSY
;
600 spin_unlock_irq(&fsg
->common
->lock
);
601 rc
= usb_ep_queue(ep
, req
, GFP_KERNEL
);
604 *state
= BUF_STATE_EMPTY
;
606 /* We can't do much more than wait for a reset */
609 * Note: currently the net2280 driver fails zero-length
610 * submissions if DMA is enabled.
612 if (rc
!= -ESHUTDOWN
&&
613 !(rc
== -EOPNOTSUPP
&& req
->length
== 0))
614 WARNING(fsg
, "error in submission: %s --> %d\n",
619 static bool start_in_transfer(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
621 if (!fsg_is_set(common
))
623 start_transfer(common
->fsg
, common
->fsg
->bulk_in
,
624 bh
->inreq
, &bh
->inreq_busy
, &bh
->state
);
628 static bool start_out_transfer(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
630 if (!fsg_is_set(common
))
632 start_transfer(common
->fsg
, common
->fsg
->bulk_out
,
633 bh
->outreq
, &bh
->outreq_busy
, &bh
->state
);
637 static int sleep_thread(struct fsg_common
*common
)
641 /* Wait until a signal arrives or we are woken up */
644 set_current_state(TASK_INTERRUPTIBLE
);
645 if (signal_pending(current
)) {
649 if (common
->thread_wakeup_needed
)
653 __set_current_state(TASK_RUNNING
);
654 common
->thread_wakeup_needed
= 0;
659 /*-------------------------------------------------------------------------*/
661 static int do_read(struct fsg_common
*common
)
663 struct fsg_lun
*curlun
= common
->curlun
;
665 struct fsg_buffhd
*bh
;
668 loff_t file_offset
, file_offset_tmp
;
673 * Get the starting Logical Block Address and check that it's
676 if (common
->cmnd
[0] == READ_6
)
677 lba
= get_unaligned_be24(&common
->cmnd
[1]);
679 lba
= get_unaligned_be32(&common
->cmnd
[2]);
682 * We allow DPO (Disable Page Out = don't save data in the
683 * cache) and FUA (Force Unit Access = don't read from the
684 * cache), but we don't implement them.
686 if ((common
->cmnd
[1] & ~0x18) != 0) {
687 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
691 if (lba
>= curlun
->num_sectors
) {
692 curlun
->sense_data
= SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
695 file_offset
= ((loff_t
) lba
) << curlun
->blkbits
;
697 /* Carry out the file reads */
698 amount_left
= common
->data_size_from_cmnd
;
699 if (unlikely(amount_left
== 0))
700 return -EIO
; /* No default reply */
704 * Figure out how much we need to read:
705 * Try to read the remaining amount.
706 * But don't read more than the buffer size.
707 * And don't try to read past the end of the file.
709 amount
= min(amount_left
, FSG_BUFLEN
);
710 amount
= min((loff_t
)amount
,
711 curlun
->file_length
- file_offset
);
713 /* Wait for the next buffer to become available */
714 bh
= common
->next_buffhd_to_fill
;
715 while (bh
->state
!= BUF_STATE_EMPTY
) {
716 rc
= sleep_thread(common
);
722 * If we were asked to read past the end of file,
723 * end with an empty buffer.
727 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
728 curlun
->sense_data_info
=
729 file_offset
>> curlun
->blkbits
;
730 curlun
->info_valid
= 1;
731 bh
->inreq
->length
= 0;
732 bh
->state
= BUF_STATE_FULL
;
736 /* Perform the read */
737 file_offset_tmp
= file_offset
;
738 nread
= vfs_read(curlun
->filp
,
739 (char __user
*)bh
->buf
,
740 amount
, &file_offset_tmp
);
741 VLDBG(curlun
, "file read %u @ %llu -> %d\n", amount
,
742 (unsigned long long)file_offset
, (int)nread
);
743 if (signal_pending(current
))
747 LDBG(curlun
, "error in file read: %d\n", (int)nread
);
749 } else if (nread
< amount
) {
750 LDBG(curlun
, "partial file read: %d/%u\n",
752 nread
= round_down(nread
, curlun
->blksize
);
754 file_offset
+= nread
;
755 amount_left
-= nread
;
756 common
->residue
-= nread
;
759 * Except at the end of the transfer, nread will be
760 * equal to the buffer size, which is divisible by the
761 * bulk-in maxpacket size.
763 bh
->inreq
->length
= nread
;
764 bh
->state
= BUF_STATE_FULL
;
766 /* If an error occurred, report it and its position */
767 if (nread
< amount
) {
768 curlun
->sense_data
= SS_UNRECOVERED_READ_ERROR
;
769 curlun
->sense_data_info
=
770 file_offset
>> curlun
->blkbits
;
771 curlun
->info_valid
= 1;
775 if (amount_left
== 0)
776 break; /* No more left to read */
778 /* Send this buffer and go read some more */
780 if (!start_in_transfer(common
, bh
))
781 /* Don't know what to do if common->fsg is NULL */
783 common
->next_buffhd_to_fill
= bh
->next
;
786 return -EIO
; /* No default reply */
790 /*-------------------------------------------------------------------------*/
792 static int do_write(struct fsg_common
*common
)
794 struct fsg_lun
*curlun
= common
->curlun
;
796 struct fsg_buffhd
*bh
;
798 u32 amount_left_to_req
, amount_left_to_write
;
799 loff_t usb_offset
, file_offset
, file_offset_tmp
;
805 curlun
->sense_data
= SS_WRITE_PROTECTED
;
808 spin_lock(&curlun
->filp
->f_lock
);
809 curlun
->filp
->f_flags
&= ~O_SYNC
; /* Default is not to wait */
810 spin_unlock(&curlun
->filp
->f_lock
);
813 * Get the starting Logical Block Address and check that it's
816 if (common
->cmnd
[0] == WRITE_6
)
817 lba
= get_unaligned_be24(&common
->cmnd
[1]);
819 lba
= get_unaligned_be32(&common
->cmnd
[2]);
822 * We allow DPO (Disable Page Out = don't save data in the
823 * cache) and FUA (Force Unit Access = write directly to the
824 * medium). We don't implement DPO; we implement FUA by
825 * performing synchronous output.
827 if (common
->cmnd
[1] & ~0x18) {
828 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
831 if (!curlun
->nofua
&& (common
->cmnd
[1] & 0x08)) { /* FUA */
832 spin_lock(&curlun
->filp
->f_lock
);
833 curlun
->filp
->f_flags
|= O_SYNC
;
834 spin_unlock(&curlun
->filp
->f_lock
);
837 if (lba
>= curlun
->num_sectors
) {
838 curlun
->sense_data
= SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
842 /* Carry out the file writes */
844 file_offset
= usb_offset
= ((loff_t
) lba
) << curlun
->blkbits
;
845 amount_left_to_req
= common
->data_size_from_cmnd
;
846 amount_left_to_write
= common
->data_size_from_cmnd
;
848 while (amount_left_to_write
> 0) {
850 /* Queue a request for more data from the host */
851 bh
= common
->next_buffhd_to_fill
;
852 if (bh
->state
== BUF_STATE_EMPTY
&& get_some_more
) {
855 * Figure out how much we want to get:
856 * Try to get the remaining amount,
857 * but not more than the buffer size.
859 amount
= min(amount_left_to_req
, FSG_BUFLEN
);
861 /* Beyond the end of the backing file? */
862 if (usb_offset
>= curlun
->file_length
) {
865 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
866 curlun
->sense_data_info
=
867 usb_offset
>> curlun
->blkbits
;
868 curlun
->info_valid
= 1;
872 /* Get the next buffer */
873 usb_offset
+= amount
;
874 common
->usb_amount_left
-= amount
;
875 amount_left_to_req
-= amount
;
876 if (amount_left_to_req
== 0)
880 * Except at the end of the transfer, amount will be
881 * equal to the buffer size, which is divisible by
882 * the bulk-out maxpacket size.
884 set_bulk_out_req_length(common
, bh
, amount
);
885 if (!start_out_transfer(common
, bh
))
886 /* Dunno what to do if common->fsg is NULL */
888 common
->next_buffhd_to_fill
= bh
->next
;
892 /* Write the received data to the backing file */
893 bh
= common
->next_buffhd_to_drain
;
894 if (bh
->state
== BUF_STATE_EMPTY
&& !get_some_more
)
895 break; /* We stopped early */
896 if (bh
->state
== BUF_STATE_FULL
) {
898 common
->next_buffhd_to_drain
= bh
->next
;
899 bh
->state
= BUF_STATE_EMPTY
;
901 /* Did something go wrong with the transfer? */
902 if (bh
->outreq
->status
!= 0) {
903 curlun
->sense_data
= SS_COMMUNICATION_FAILURE
;
904 curlun
->sense_data_info
=
905 file_offset
>> curlun
->blkbits
;
906 curlun
->info_valid
= 1;
910 amount
= bh
->outreq
->actual
;
911 if (curlun
->file_length
- file_offset
< amount
) {
913 "write %u @ %llu beyond end %llu\n",
914 amount
, (unsigned long long)file_offset
,
915 (unsigned long long)curlun
->file_length
);
916 amount
= curlun
->file_length
- file_offset
;
919 /* Don't accept excess data. The spec doesn't say
920 * what to do in this case. We'll ignore the error.
922 amount
= min(amount
, bh
->bulk_out_intended_length
);
924 /* Don't write a partial block */
925 amount
= round_down(amount
, curlun
->blksize
);
929 /* Perform the write */
930 file_offset_tmp
= file_offset
;
931 nwritten
= vfs_write(curlun
->filp
,
932 (char __user
*)bh
->buf
,
933 amount
, &file_offset_tmp
);
934 VLDBG(curlun
, "file write %u @ %llu -> %d\n", amount
,
935 (unsigned long long)file_offset
, (int)nwritten
);
936 if (signal_pending(current
))
937 return -EINTR
; /* Interrupted! */
940 LDBG(curlun
, "error in file write: %d\n",
943 } else if (nwritten
< amount
) {
944 LDBG(curlun
, "partial file write: %d/%u\n",
945 (int)nwritten
, amount
);
946 nwritten
= round_down(nwritten
, curlun
->blksize
);
948 file_offset
+= nwritten
;
949 amount_left_to_write
-= nwritten
;
950 common
->residue
-= nwritten
;
952 /* If an error occurred, report it and its position */
953 if (nwritten
< amount
) {
954 curlun
->sense_data
= SS_WRITE_ERROR
;
955 curlun
->sense_data_info
=
956 file_offset
>> curlun
->blkbits
;
957 curlun
->info_valid
= 1;
962 /* Did the host decide to stop early? */
963 if (bh
->outreq
->actual
< bh
->bulk_out_intended_length
) {
964 common
->short_packet_received
= 1;
970 /* Wait for something to happen */
971 rc
= sleep_thread(common
);
976 return -EIO
; /* No default reply */
980 /*-------------------------------------------------------------------------*/
982 static int do_synchronize_cache(struct fsg_common
*common
)
984 struct fsg_lun
*curlun
= common
->curlun
;
987 /* We ignore the requested LBA and write out all file's
988 * dirty data buffers. */
989 rc
= fsg_lun_fsync_sub(curlun
);
991 curlun
->sense_data
= SS_WRITE_ERROR
;
996 /*-------------------------------------------------------------------------*/
998 static void invalidate_sub(struct fsg_lun
*curlun
)
1000 struct file
*filp
= curlun
->filp
;
1001 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
1004 rc
= invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
1005 VLDBG(curlun
, "invalidate_mapping_pages -> %ld\n", rc
);
1008 static int do_verify(struct fsg_common
*common
)
1010 struct fsg_lun
*curlun
= common
->curlun
;
1012 u32 verification_length
;
1013 struct fsg_buffhd
*bh
= common
->next_buffhd_to_fill
;
1014 loff_t file_offset
, file_offset_tmp
;
1016 unsigned int amount
;
1020 * Get the starting Logical Block Address and check that it's
1023 lba
= get_unaligned_be32(&common
->cmnd
[2]);
1024 if (lba
>= curlun
->num_sectors
) {
1025 curlun
->sense_data
= SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
1030 * We allow DPO (Disable Page Out = don't save data in the
1031 * cache) but we don't implement it.
1033 if (common
->cmnd
[1] & ~0x10) {
1034 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1038 verification_length
= get_unaligned_be16(&common
->cmnd
[7]);
1039 if (unlikely(verification_length
== 0))
1040 return -EIO
; /* No default reply */
1042 /* Prepare to carry out the file verify */
1043 amount_left
= verification_length
<< curlun
->blkbits
;
1044 file_offset
= ((loff_t
) lba
) << curlun
->blkbits
;
1046 /* Write out all the dirty buffers before invalidating them */
1047 fsg_lun_fsync_sub(curlun
);
1048 if (signal_pending(current
))
1051 invalidate_sub(curlun
);
1052 if (signal_pending(current
))
1055 /* Just try to read the requested blocks */
1056 while (amount_left
> 0) {
1058 * Figure out how much we need to read:
1059 * Try to read the remaining amount, but not more than
1061 * And don't try to read past the end of the file.
1063 amount
= min(amount_left
, FSG_BUFLEN
);
1064 amount
= min((loff_t
)amount
,
1065 curlun
->file_length
- file_offset
);
1067 curlun
->sense_data
=
1068 SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
1069 curlun
->sense_data_info
=
1070 file_offset
>> curlun
->blkbits
;
1071 curlun
->info_valid
= 1;
1075 /* Perform the read */
1076 file_offset_tmp
= file_offset
;
1077 nread
= vfs_read(curlun
->filp
,
1078 (char __user
*) bh
->buf
,
1079 amount
, &file_offset_tmp
);
1080 VLDBG(curlun
, "file read %u @ %llu -> %d\n", amount
,
1081 (unsigned long long) file_offset
,
1083 if (signal_pending(current
))
1087 LDBG(curlun
, "error in file verify: %d\n", (int)nread
);
1089 } else if (nread
< amount
) {
1090 LDBG(curlun
, "partial file verify: %d/%u\n",
1091 (int)nread
, amount
);
1092 nread
= round_down(nread
, curlun
->blksize
);
1095 curlun
->sense_data
= SS_UNRECOVERED_READ_ERROR
;
1096 curlun
->sense_data_info
=
1097 file_offset
>> curlun
->blkbits
;
1098 curlun
->info_valid
= 1;
1101 file_offset
+= nread
;
1102 amount_left
-= nread
;
1108 /*-------------------------------------------------------------------------*/
1110 static int do_inquiry(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1112 struct fsg_lun
*curlun
= common
->curlun
;
1113 u8
*buf
= (u8
*) bh
->buf
;
1115 if (!curlun
) { /* Unsupported LUNs are okay */
1116 common
->bad_lun_okay
= 1;
1118 buf
[0] = 0x7f; /* Unsupported, no device-type */
1119 buf
[4] = 31; /* Additional length */
1123 buf
[0] = curlun
->cdrom
? TYPE_ROM
: TYPE_DISK
;
1124 buf
[1] = curlun
->removable
? 0x80 : 0;
1125 buf
[2] = 2; /* ANSI SCSI level 2 */
1126 buf
[3] = 2; /* SCSI-2 INQUIRY data format */
1127 buf
[4] = 31; /* Additional length */
1128 buf
[5] = 0; /* No special options */
1131 memcpy(buf
+ 8, common
->inquiry_string
, sizeof common
->inquiry_string
);
1135 static int do_request_sense(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1137 struct fsg_lun
*curlun
= common
->curlun
;
1138 u8
*buf
= (u8
*) bh
->buf
;
1143 * From the SCSI-2 spec., section 7.9 (Unit attention condition):
1145 * If a REQUEST SENSE command is received from an initiator
1146 * with a pending unit attention condition (before the target
1147 * generates the contingent allegiance condition), then the
1148 * target shall either:
1149 * a) report any pending sense data and preserve the unit
1150 * attention condition on the logical unit, or,
1151 * b) report the unit attention condition, may discard any
1152 * pending sense data, and clear the unit attention
1153 * condition on the logical unit for that initiator.
1155 * FSG normally uses option a); enable this code to use option b).
1158 if (curlun
&& curlun
->unit_attention_data
!= SS_NO_SENSE
) {
1159 curlun
->sense_data
= curlun
->unit_attention_data
;
1160 curlun
->unit_attention_data
= SS_NO_SENSE
;
1164 if (!curlun
) { /* Unsupported LUNs are okay */
1165 common
->bad_lun_okay
= 1;
1166 sd
= SS_LOGICAL_UNIT_NOT_SUPPORTED
;
1170 sd
= curlun
->sense_data
;
1171 sdinfo
= curlun
->sense_data_info
;
1172 valid
= curlun
->info_valid
<< 7;
1173 curlun
->sense_data
= SS_NO_SENSE
;
1174 curlun
->sense_data_info
= 0;
1175 curlun
->info_valid
= 0;
1179 buf
[0] = valid
| 0x70; /* Valid, current error */
1181 put_unaligned_be32(sdinfo
, &buf
[3]); /* Sense information */
1182 buf
[7] = 18 - 8; /* Additional sense length */
1188 static int do_read_capacity(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1190 struct fsg_lun
*curlun
= common
->curlun
;
1191 u32 lba
= get_unaligned_be32(&common
->cmnd
[2]);
1192 int pmi
= common
->cmnd
[8];
1193 u8
*buf
= (u8
*)bh
->buf
;
1195 /* Check the PMI and LBA fields */
1196 if (pmi
> 1 || (pmi
== 0 && lba
!= 0)) {
1197 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1201 put_unaligned_be32(curlun
->num_sectors
- 1, &buf
[0]);
1202 /* Max logical block */
1203 put_unaligned_be32(curlun
->blksize
, &buf
[4]);/* Block length */
1207 static int do_read_header(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1209 struct fsg_lun
*curlun
= common
->curlun
;
1210 int msf
= common
->cmnd
[1] & 0x02;
1211 u32 lba
= get_unaligned_be32(&common
->cmnd
[2]);
1212 u8
*buf
= (u8
*)bh
->buf
;
1214 if (common
->cmnd
[1] & ~0x02) { /* Mask away MSF */
1215 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1218 if (lba
>= curlun
->num_sectors
) {
1219 curlun
->sense_data
= SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE
;
1224 buf
[0] = 0x01; /* 2048 bytes of user data, rest is EC */
1225 store_cdrom_address(&buf
[4], msf
, lba
);
1229 static int do_read_toc(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1231 struct fsg_lun
*curlun
= common
->curlun
;
1232 int msf
= common
->cmnd
[1] & 0x02;
1233 int start_track
= common
->cmnd
[6];
1234 u8
*buf
= (u8
*)bh
->buf
;
1236 if ((common
->cmnd
[1] & ~0x02) != 0 || /* Mask away MSF */
1238 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1243 buf
[1] = (20-2); /* TOC data length */
1244 buf
[2] = 1; /* First track number */
1245 buf
[3] = 1; /* Last track number */
1246 buf
[5] = 0x16; /* Data track, copying allowed */
1247 buf
[6] = 0x01; /* Only track is number 1 */
1248 store_cdrom_address(&buf
[8], msf
, 0);
1250 buf
[13] = 0x16; /* Lead-out track is data */
1251 buf
[14] = 0xAA; /* Lead-out track number */
1252 store_cdrom_address(&buf
[16], msf
, curlun
->num_sectors
);
1256 static int do_mode_sense(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1258 struct fsg_lun
*curlun
= common
->curlun
;
1259 int mscmnd
= common
->cmnd
[0];
1260 u8
*buf
= (u8
*) bh
->buf
;
1263 int changeable_values
, all_pages
;
1267 if ((common
->cmnd
[1] & ~0x08) != 0) { /* Mask away DBD */
1268 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1271 pc
= common
->cmnd
[2] >> 6;
1272 page_code
= common
->cmnd
[2] & 0x3f;
1274 curlun
->sense_data
= SS_SAVING_PARAMETERS_NOT_SUPPORTED
;
1277 changeable_values
= (pc
== 1);
1278 all_pages
= (page_code
== 0x3f);
1281 * Write the mode parameter header. Fixed values are: default
1282 * medium type, no cache control (DPOFUA), and no block descriptors.
1283 * The only variable value is the WriteProtect bit. We will fill in
1284 * the mode data length later.
1287 if (mscmnd
== MODE_SENSE
) {
1288 buf
[2] = (curlun
->ro
? 0x80 : 0x00); /* WP, DPOFUA */
1291 } else { /* MODE_SENSE_10 */
1292 buf
[3] = (curlun
->ro
? 0x80 : 0x00); /* WP, DPOFUA */
1294 limit
= 65535; /* Should really be FSG_BUFLEN */
1297 /* No block descriptors */
1300 * The mode pages, in numerical order. The only page we support
1301 * is the Caching page.
1303 if (page_code
== 0x08 || all_pages
) {
1305 buf
[0] = 0x08; /* Page code */
1306 buf
[1] = 10; /* Page length */
1307 memset(buf
+2, 0, 10); /* None of the fields are changeable */
1309 if (!changeable_values
) {
1310 buf
[2] = 0x04; /* Write cache enable, */
1311 /* Read cache not disabled */
1312 /* No cache retention priorities */
1313 put_unaligned_be16(0xffff, &buf
[4]);
1314 /* Don't disable prefetch */
1315 /* Minimum prefetch = 0 */
1316 put_unaligned_be16(0xffff, &buf
[8]);
1317 /* Maximum prefetch */
1318 put_unaligned_be16(0xffff, &buf
[10]);
1319 /* Maximum prefetch ceiling */
1325 * Check that a valid page was requested and the mode data length
1329 if (!valid_page
|| len
> limit
) {
1330 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1334 /* Store the mode data length */
1335 if (mscmnd
== MODE_SENSE
)
1338 put_unaligned_be16(len
- 2, buf0
);
1342 static int do_start_stop(struct fsg_common
*common
)
1344 struct fsg_lun
*curlun
= common
->curlun
;
1349 } else if (!curlun
->removable
) {
1350 curlun
->sense_data
= SS_INVALID_COMMAND
;
1352 } else if ((common
->cmnd
[1] & ~0x01) != 0 || /* Mask away Immed */
1353 (common
->cmnd
[4] & ~0x03) != 0) { /* Mask LoEj, Start */
1354 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1358 loej
= common
->cmnd
[4] & 0x02;
1359 start
= common
->cmnd
[4] & 0x01;
1362 * Our emulation doesn't support mounting; the medium is
1363 * available for use as soon as it is loaded.
1366 if (!fsg_lun_is_open(curlun
)) {
1367 curlun
->sense_data
= SS_MEDIUM_NOT_PRESENT
;
1373 /* Are we allowed to unload the media? */
1374 if (curlun
->prevent_medium_removal
) {
1375 LDBG(curlun
, "unload attempt prevented\n");
1376 curlun
->sense_data
= SS_MEDIUM_REMOVAL_PREVENTED
;
1383 /* Simulate an unload/eject */
1384 if (common
->ops
&& common
->ops
->pre_eject
) {
1385 int r
= common
->ops
->pre_eject(common
, curlun
,
1386 curlun
- common
->luns
);
1387 if (unlikely(r
< 0))
1393 up_read(&common
->filesem
);
1394 down_write(&common
->filesem
);
1395 fsg_lun_close(curlun
);
1396 up_write(&common
->filesem
);
1397 down_read(&common
->filesem
);
1399 return common
->ops
&& common
->ops
->post_eject
1400 ? min(0, common
->ops
->post_eject(common
, curlun
,
1401 curlun
- common
->luns
))
1405 static int do_prevent_allow(struct fsg_common
*common
)
1407 struct fsg_lun
*curlun
= common
->curlun
;
1410 if (!common
->curlun
) {
1412 } else if (!common
->curlun
->removable
) {
1413 common
->curlun
->sense_data
= SS_INVALID_COMMAND
;
1417 prevent
= common
->cmnd
[4] & 0x01;
1418 if ((common
->cmnd
[4] & ~0x01) != 0) { /* Mask away Prevent */
1419 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1423 if (curlun
->prevent_medium_removal
&& !prevent
)
1424 fsg_lun_fsync_sub(curlun
);
1425 curlun
->prevent_medium_removal
= prevent
;
1429 static int do_read_format_capacities(struct fsg_common
*common
,
1430 struct fsg_buffhd
*bh
)
1432 struct fsg_lun
*curlun
= common
->curlun
;
1433 u8
*buf
= (u8
*) bh
->buf
;
1435 buf
[0] = buf
[1] = buf
[2] = 0;
1436 buf
[3] = 8; /* Only the Current/Maximum Capacity Descriptor */
1439 put_unaligned_be32(curlun
->num_sectors
, &buf
[0]);
1440 /* Number of blocks */
1441 put_unaligned_be32(curlun
->blksize
, &buf
[4]);/* Block length */
1442 buf
[4] = 0x02; /* Current capacity */
1446 static int do_mode_select(struct fsg_common
*common
, struct fsg_buffhd
*bh
)
1448 struct fsg_lun
*curlun
= common
->curlun
;
1450 /* We don't support MODE SELECT */
1452 curlun
->sense_data
= SS_INVALID_COMMAND
;
1457 /*-------------------------------------------------------------------------*/
1459 static int halt_bulk_in_endpoint(struct fsg_dev
*fsg
)
1463 rc
= fsg_set_halt(fsg
, fsg
->bulk_in
);
1465 VDBG(fsg
, "delayed bulk-in endpoint halt\n");
1467 if (rc
!= -EAGAIN
) {
1468 WARNING(fsg
, "usb_ep_set_halt -> %d\n", rc
);
1473 /* Wait for a short time and then try again */
1474 if (msleep_interruptible(100) != 0)
1476 rc
= usb_ep_set_halt(fsg
->bulk_in
);
1481 static int wedge_bulk_in_endpoint(struct fsg_dev
*fsg
)
1485 DBG(fsg
, "bulk-in set wedge\n");
1486 rc
= usb_ep_set_wedge(fsg
->bulk_in
);
1488 VDBG(fsg
, "delayed bulk-in endpoint wedge\n");
1490 if (rc
!= -EAGAIN
) {
1491 WARNING(fsg
, "usb_ep_set_wedge -> %d\n", rc
);
1496 /* Wait for a short time and then try again */
1497 if (msleep_interruptible(100) != 0)
1499 rc
= usb_ep_set_wedge(fsg
->bulk_in
);
1504 static int throw_away_data(struct fsg_common
*common
)
1506 struct fsg_buffhd
*bh
;
1510 for (bh
= common
->next_buffhd_to_drain
;
1511 bh
->state
!= BUF_STATE_EMPTY
|| common
->usb_amount_left
> 0;
1512 bh
= common
->next_buffhd_to_drain
) {
1514 /* Throw away the data in a filled buffer */
1515 if (bh
->state
== BUF_STATE_FULL
) {
1517 bh
->state
= BUF_STATE_EMPTY
;
1518 common
->next_buffhd_to_drain
= bh
->next
;
1520 /* A short packet or an error ends everything */
1521 if (bh
->outreq
->actual
< bh
->bulk_out_intended_length
||
1522 bh
->outreq
->status
!= 0) {
1523 raise_exception(common
,
1524 FSG_STATE_ABORT_BULK_OUT
);
1530 /* Try to submit another request if we need one */
1531 bh
= common
->next_buffhd_to_fill
;
1532 if (bh
->state
== BUF_STATE_EMPTY
1533 && common
->usb_amount_left
> 0) {
1534 amount
= min(common
->usb_amount_left
, FSG_BUFLEN
);
1537 * Except at the end of the transfer, amount will be
1538 * equal to the buffer size, which is divisible by
1539 * the bulk-out maxpacket size.
1541 set_bulk_out_req_length(common
, bh
, amount
);
1542 if (!start_out_transfer(common
, bh
))
1543 /* Dunno what to do if common->fsg is NULL */
1545 common
->next_buffhd_to_fill
= bh
->next
;
1546 common
->usb_amount_left
-= amount
;
1550 /* Otherwise wait for something to happen */
1551 rc
= sleep_thread(common
);
1558 static int finish_reply(struct fsg_common
*common
)
1560 struct fsg_buffhd
*bh
= common
->next_buffhd_to_fill
;
1563 switch (common
->data_dir
) {
1565 break; /* Nothing to send */
1568 * If we don't know whether the host wants to read or write,
1569 * this must be CB or CBI with an unknown command. We mustn't
1570 * try to send or receive any data. So stall both bulk pipes
1571 * if we can and wait for a reset.
1573 case DATA_DIR_UNKNOWN
:
1574 if (!common
->can_stall
) {
1576 } else if (fsg_is_set(common
)) {
1577 fsg_set_halt(common
->fsg
, common
->fsg
->bulk_out
);
1578 rc
= halt_bulk_in_endpoint(common
->fsg
);
1580 /* Don't know what to do if common->fsg is NULL */
1585 /* All but the last buffer of data must have already been sent */
1586 case DATA_DIR_TO_HOST
:
1587 if (common
->data_size
== 0) {
1588 /* Nothing to send */
1590 /* Don't know what to do if common->fsg is NULL */
1591 } else if (!fsg_is_set(common
)) {
1594 /* If there's no residue, simply send the last buffer */
1595 } else if (common
->residue
== 0) {
1596 bh
->inreq
->zero
= 0;
1597 if (!start_in_transfer(common
, bh
))
1599 common
->next_buffhd_to_fill
= bh
->next
;
1602 * For Bulk-only, mark the end of the data with a short
1603 * packet. If we are allowed to stall, halt the bulk-in
1604 * endpoint. (Note: This violates the Bulk-Only Transport
1605 * specification, which requires us to pad the data if we
1606 * don't halt the endpoint. Presumably nobody will mind.)
1609 bh
->inreq
->zero
= 1;
1610 if (!start_in_transfer(common
, bh
))
1612 common
->next_buffhd_to_fill
= bh
->next
;
1613 if (common
->can_stall
)
1614 rc
= halt_bulk_in_endpoint(common
->fsg
);
1619 * We have processed all we want from the data the host has sent.
1620 * There may still be outstanding bulk-out requests.
1622 case DATA_DIR_FROM_HOST
:
1623 if (common
->residue
== 0) {
1624 /* Nothing to receive */
1626 /* Did the host stop sending unexpectedly early? */
1627 } else if (common
->short_packet_received
) {
1628 raise_exception(common
, FSG_STATE_ABORT_BULK_OUT
);
1632 * We haven't processed all the incoming data. Even though
1633 * we may be allowed to stall, doing so would cause a race.
1634 * The controller may already have ACK'ed all the remaining
1635 * bulk-out packets, in which case the host wouldn't see a
1636 * STALL. Not realizing the endpoint was halted, it wouldn't
1637 * clear the halt -- leading to problems later on.
1640 } else if (common
->can_stall
) {
1641 if (fsg_is_set(common
))
1642 fsg_set_halt(common
->fsg
,
1643 common
->fsg
->bulk_out
);
1644 raise_exception(common
, FSG_STATE_ABORT_BULK_OUT
);
1649 * We can't stall. Read in the excess data and throw it
1653 rc
= throw_away_data(common
);
1660 static int send_status(struct fsg_common
*common
)
1662 struct fsg_lun
*curlun
= common
->curlun
;
1663 struct fsg_buffhd
*bh
;
1664 struct bulk_cs_wrap
*csw
;
1666 u8 status
= US_BULK_STAT_OK
;
1669 /* Wait for the next buffer to become available */
1670 bh
= common
->next_buffhd_to_fill
;
1671 while (bh
->state
!= BUF_STATE_EMPTY
) {
1672 rc
= sleep_thread(common
);
1678 sd
= curlun
->sense_data
;
1679 sdinfo
= curlun
->sense_data_info
;
1680 } else if (common
->bad_lun_okay
)
1683 sd
= SS_LOGICAL_UNIT_NOT_SUPPORTED
;
1685 if (common
->phase_error
) {
1686 DBG(common
, "sending phase-error status\n");
1687 status
= US_BULK_STAT_PHASE
;
1688 sd
= SS_INVALID_COMMAND
;
1689 } else if (sd
!= SS_NO_SENSE
) {
1690 DBG(common
, "sending command-failure status\n");
1691 status
= US_BULK_STAT_FAIL
;
1692 VDBG(common
, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
1694 SK(sd
), ASC(sd
), ASCQ(sd
), sdinfo
);
1697 /* Store and send the Bulk-only CSW */
1698 csw
= (void *)bh
->buf
;
1700 csw
->Signature
= cpu_to_le32(US_BULK_CS_SIGN
);
1701 csw
->Tag
= common
->tag
;
1702 csw
->Residue
= cpu_to_le32(common
->residue
);
1703 csw
->Status
= status
;
1705 bh
->inreq
->length
= US_BULK_CS_WRAP_LEN
;
1706 bh
->inreq
->zero
= 0;
1707 if (!start_in_transfer(common
, bh
))
1708 /* Don't know what to do if common->fsg is NULL */
1711 common
->next_buffhd_to_fill
= bh
->next
;
1716 /*-------------------------------------------------------------------------*/
1719 * Check whether the command is properly formed and whether its data size
1720 * and direction agree with the values we already have.
1722 static int check_command(struct fsg_common
*common
, int cmnd_size
,
1723 enum data_direction data_dir
, unsigned int mask
,
1724 int needs_medium
, const char *name
)
1727 int lun
= common
->cmnd
[1] >> 5;
1728 static const char dirletter
[4] = {'u', 'o', 'i', 'n'};
1730 struct fsg_lun
*curlun
;
1733 if (common
->data_dir
!= DATA_DIR_UNKNOWN
)
1734 sprintf(hdlen
, ", H%c=%u", dirletter
[(int) common
->data_dir
],
1736 VDBG(common
, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
1737 name
, cmnd_size
, dirletter
[(int) data_dir
],
1738 common
->data_size_from_cmnd
, common
->cmnd_size
, hdlen
);
1741 * We can't reply at all until we know the correct data direction
1744 if (common
->data_size_from_cmnd
== 0)
1745 data_dir
= DATA_DIR_NONE
;
1746 if (common
->data_size
< common
->data_size_from_cmnd
) {
1748 * Host data size < Device data size is a phase error.
1749 * Carry out the command, but only transfer as much as
1752 common
->data_size_from_cmnd
= common
->data_size
;
1753 common
->phase_error
= 1;
1755 common
->residue
= common
->data_size
;
1756 common
->usb_amount_left
= common
->data_size
;
1758 /* Conflicting data directions is a phase error */
1759 if (common
->data_dir
!= data_dir
&& common
->data_size_from_cmnd
> 0) {
1760 common
->phase_error
= 1;
1764 /* Verify the length of the command itself */
1765 if (cmnd_size
!= common
->cmnd_size
) {
1768 * Special case workaround: There are plenty of buggy SCSI
1769 * implementations. Many have issues with cbw->Length
1770 * field passing a wrong command size. For those cases we
1771 * always try to work around the problem by using the length
1772 * sent by the host side provided it is at least as large
1773 * as the correct command length.
1774 * Examples of such cases would be MS-Windows, which issues
1775 * REQUEST SENSE with cbw->Length == 12 where it should
1776 * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
1777 * REQUEST SENSE with cbw->Length == 10 where it should
1780 if (cmnd_size
<= common
->cmnd_size
) {
1781 DBG(common
, "%s is buggy! Expected length %d "
1782 "but we got %d\n", name
,
1783 cmnd_size
, common
->cmnd_size
);
1784 cmnd_size
= common
->cmnd_size
;
1786 common
->phase_error
= 1;
1791 /* Check that the LUN values are consistent */
1792 if (common
->lun
!= lun
)
1793 DBG(common
, "using LUN %d from CBW, not LUN %d from CDB\n",
1797 curlun
= common
->curlun
;
1799 if (common
->cmnd
[0] != REQUEST_SENSE
) {
1800 curlun
->sense_data
= SS_NO_SENSE
;
1801 curlun
->sense_data_info
= 0;
1802 curlun
->info_valid
= 0;
1805 common
->bad_lun_okay
= 0;
1808 * INQUIRY and REQUEST SENSE commands are explicitly allowed
1809 * to use unsupported LUNs; all others may not.
1811 if (common
->cmnd
[0] != INQUIRY
&&
1812 common
->cmnd
[0] != REQUEST_SENSE
) {
1813 DBG(common
, "unsupported LUN %d\n", common
->lun
);
1819 * If a unit attention condition exists, only INQUIRY and
1820 * REQUEST SENSE commands are allowed; anything else must fail.
1822 if (curlun
&& curlun
->unit_attention_data
!= SS_NO_SENSE
&&
1823 common
->cmnd
[0] != INQUIRY
&&
1824 common
->cmnd
[0] != REQUEST_SENSE
) {
1825 curlun
->sense_data
= curlun
->unit_attention_data
;
1826 curlun
->unit_attention_data
= SS_NO_SENSE
;
1830 /* Check that only command bytes listed in the mask are non-zero */
1831 common
->cmnd
[1] &= 0x1f; /* Mask away the LUN */
1832 for (i
= 1; i
< cmnd_size
; ++i
) {
1833 if (common
->cmnd
[i
] && !(mask
& (1 << i
))) {
1835 curlun
->sense_data
= SS_INVALID_FIELD_IN_CDB
;
1840 /* If the medium isn't mounted and the command needs to access
1841 * it, return an error. */
1842 if (curlun
&& !fsg_lun_is_open(curlun
) && needs_medium
) {
1843 curlun
->sense_data
= SS_MEDIUM_NOT_PRESENT
;
1850 /* wrapper of check_command for data size in blocks handling */
1851 static int check_command_size_in_blocks(struct fsg_common
*common
,
1852 int cmnd_size
, enum data_direction data_dir
,
1853 unsigned int mask
, int needs_medium
, const char *name
)
1856 common
->data_size_from_cmnd
<<= common
->curlun
->blkbits
;
1857 return check_command(common
, cmnd_size
, data_dir
,
1858 mask
, needs_medium
, name
);
1861 static int do_scsi_command(struct fsg_common
*common
)
1863 struct fsg_buffhd
*bh
;
1865 int reply
= -EINVAL
;
1867 static char unknown
[16];
1871 /* Wait for the next buffer to become available for data or status */
1872 bh
= common
->next_buffhd_to_fill
;
1873 common
->next_buffhd_to_drain
= bh
;
1874 while (bh
->state
!= BUF_STATE_EMPTY
) {
1875 rc
= sleep_thread(common
);
1879 common
->phase_error
= 0;
1880 common
->short_packet_received
= 0;
1882 down_read(&common
->filesem
); /* We're using the backing file */
1883 switch (common
->cmnd
[0]) {
1886 common
->data_size_from_cmnd
= common
->cmnd
[4];
1887 reply
= check_command(common
, 6, DATA_DIR_TO_HOST
,
1891 reply
= do_inquiry(common
, bh
);
1895 common
->data_size_from_cmnd
= common
->cmnd
[4];
1896 reply
= check_command(common
, 6, DATA_DIR_FROM_HOST
,
1900 reply
= do_mode_select(common
, bh
);
1903 case MODE_SELECT_10
:
1904 common
->data_size_from_cmnd
=
1905 get_unaligned_be16(&common
->cmnd
[7]);
1906 reply
= check_command(common
, 10, DATA_DIR_FROM_HOST
,
1910 reply
= do_mode_select(common
, bh
);
1914 common
->data_size_from_cmnd
= common
->cmnd
[4];
1915 reply
= check_command(common
, 6, DATA_DIR_TO_HOST
,
1916 (1<<1) | (1<<2) | (1<<4), 0,
1919 reply
= do_mode_sense(common
, bh
);
1923 common
->data_size_from_cmnd
=
1924 get_unaligned_be16(&common
->cmnd
[7]);
1925 reply
= check_command(common
, 10, DATA_DIR_TO_HOST
,
1926 (1<<1) | (1<<2) | (3<<7), 0,
1929 reply
= do_mode_sense(common
, bh
);
1932 case ALLOW_MEDIUM_REMOVAL
:
1933 common
->data_size_from_cmnd
= 0;
1934 reply
= check_command(common
, 6, DATA_DIR_NONE
,
1936 "PREVENT-ALLOW MEDIUM REMOVAL");
1938 reply
= do_prevent_allow(common
);
1942 i
= common
->cmnd
[4];
1943 common
->data_size_from_cmnd
= (i
== 0) ? 256 : i
;
1944 reply
= check_command_size_in_blocks(common
, 6,
1949 reply
= do_read(common
);
1953 common
->data_size_from_cmnd
=
1954 get_unaligned_be16(&common
->cmnd
[7]);
1955 reply
= check_command_size_in_blocks(common
, 10,
1957 (1<<1) | (0xf<<2) | (3<<7), 1,
1960 reply
= do_read(common
);
1964 common
->data_size_from_cmnd
=
1965 get_unaligned_be32(&common
->cmnd
[6]);
1966 reply
= check_command_size_in_blocks(common
, 12,
1968 (1<<1) | (0xf<<2) | (0xf<<6), 1,
1971 reply
= do_read(common
);
1975 common
->data_size_from_cmnd
= 8;
1976 reply
= check_command(common
, 10, DATA_DIR_TO_HOST
,
1977 (0xf<<2) | (1<<8), 1,
1980 reply
= do_read_capacity(common
, bh
);
1984 if (!common
->curlun
|| !common
->curlun
->cdrom
)
1986 common
->data_size_from_cmnd
=
1987 get_unaligned_be16(&common
->cmnd
[7]);
1988 reply
= check_command(common
, 10, DATA_DIR_TO_HOST
,
1989 (3<<7) | (0x1f<<1), 1,
1992 reply
= do_read_header(common
, bh
);
1996 if (!common
->curlun
|| !common
->curlun
->cdrom
)
1998 common
->data_size_from_cmnd
=
1999 get_unaligned_be16(&common
->cmnd
[7]);
2000 reply
= check_command(common
, 10, DATA_DIR_TO_HOST
,
2004 reply
= do_read_toc(common
, bh
);
2007 case READ_FORMAT_CAPACITIES
:
2008 common
->data_size_from_cmnd
=
2009 get_unaligned_be16(&common
->cmnd
[7]);
2010 reply
= check_command(common
, 10, DATA_DIR_TO_HOST
,
2012 "READ FORMAT CAPACITIES");
2014 reply
= do_read_format_capacities(common
, bh
);
2018 common
->data_size_from_cmnd
= common
->cmnd
[4];
2019 reply
= check_command(common
, 6, DATA_DIR_TO_HOST
,
2023 reply
= do_request_sense(common
, bh
);
2027 common
->data_size_from_cmnd
= 0;
2028 reply
= check_command(common
, 6, DATA_DIR_NONE
,
2032 reply
= do_start_stop(common
);
2035 case SYNCHRONIZE_CACHE
:
2036 common
->data_size_from_cmnd
= 0;
2037 reply
= check_command(common
, 10, DATA_DIR_NONE
,
2038 (0xf<<2) | (3<<7), 1,
2039 "SYNCHRONIZE CACHE");
2041 reply
= do_synchronize_cache(common
);
2044 case TEST_UNIT_READY
:
2045 common
->data_size_from_cmnd
= 0;
2046 reply
= check_command(common
, 6, DATA_DIR_NONE
,
2052 * Although optional, this command is used by MS-Windows. We
2053 * support a minimal version: BytChk must be 0.
2056 common
->data_size_from_cmnd
= 0;
2057 reply
= check_command(common
, 10, DATA_DIR_NONE
,
2058 (1<<1) | (0xf<<2) | (3<<7), 1,
2061 reply
= do_verify(common
);
2065 i
= common
->cmnd
[4];
2066 common
->data_size_from_cmnd
= (i
== 0) ? 256 : i
;
2067 reply
= check_command_size_in_blocks(common
, 6,
2072 reply
= do_write(common
);
2076 common
->data_size_from_cmnd
=
2077 get_unaligned_be16(&common
->cmnd
[7]);
2078 reply
= check_command_size_in_blocks(common
, 10,
2080 (1<<1) | (0xf<<2) | (3<<7), 1,
2083 reply
= do_write(common
);
2087 common
->data_size_from_cmnd
=
2088 get_unaligned_be32(&common
->cmnd
[6]);
2089 reply
= check_command_size_in_blocks(common
, 12,
2091 (1<<1) | (0xf<<2) | (0xf<<6), 1,
2094 reply
= do_write(common
);
2098 * Some mandatory commands that we recognize but don't implement.
2099 * They don't mean much in this setting. It's left as an exercise
2100 * for anyone interested to implement RESERVE and RELEASE in terms
2106 case SEND_DIAGNOSTIC
:
2111 common
->data_size_from_cmnd
= 0;
2112 sprintf(unknown
, "Unknown x%02x", common
->cmnd
[0]);
2113 reply
= check_command(common
, common
->cmnd_size
,
2114 DATA_DIR_UNKNOWN
, ~0, 0, unknown
);
2116 common
->curlun
->sense_data
= SS_INVALID_COMMAND
;
2121 up_read(&common
->filesem
);
2123 if (reply
== -EINTR
|| signal_pending(current
))
2126 /* Set up the single reply buffer for finish_reply() */
2127 if (reply
== -EINVAL
)
2128 reply
= 0; /* Error reply length */
2129 if (reply
>= 0 && common
->data_dir
== DATA_DIR_TO_HOST
) {
2130 reply
= min((u32
)reply
, common
->data_size_from_cmnd
);
2131 bh
->inreq
->length
= reply
;
2132 bh
->state
= BUF_STATE_FULL
;
2133 common
->residue
-= reply
;
2134 } /* Otherwise it's already set */
2140 /*-------------------------------------------------------------------------*/
2142 static int received_cbw(struct fsg_dev
*fsg
, struct fsg_buffhd
*bh
)
2144 struct usb_request
*req
= bh
->outreq
;
2145 struct bulk_cb_wrap
*cbw
= req
->buf
;
2146 struct fsg_common
*common
= fsg
->common
;
2148 /* Was this a real packet? Should it be ignored? */
2149 if (req
->status
|| test_bit(IGNORE_BULK_OUT
, &fsg
->atomic_bitflags
))
2152 /* Is the CBW valid? */
2153 if (req
->actual
!= US_BULK_CB_WRAP_LEN
||
2154 cbw
->Signature
!= cpu_to_le32(
2156 DBG(fsg
, "invalid CBW: len %u sig 0x%x\n",
2158 le32_to_cpu(cbw
->Signature
));
2161 * The Bulk-only spec says we MUST stall the IN endpoint
2162 * (6.6.1), so it's unavoidable. It also says we must
2163 * retain this state until the next reset, but there's
2164 * no way to tell the controller driver it should ignore
2165 * Clear-Feature(HALT) requests.
2167 * We aren't required to halt the OUT endpoint; instead
2168 * we can simply accept and discard any data received
2169 * until the next reset.
2171 wedge_bulk_in_endpoint(fsg
);
2172 set_bit(IGNORE_BULK_OUT
, &fsg
->atomic_bitflags
);
2176 /* Is the CBW meaningful? */
2177 if (cbw
->Lun
>= FSG_MAX_LUNS
|| cbw
->Flags
& ~US_BULK_FLAG_IN
||
2178 cbw
->Length
<= 0 || cbw
->Length
> MAX_COMMAND_SIZE
) {
2179 DBG(fsg
, "non-meaningful CBW: lun = %u, flags = 0x%x, "
2181 cbw
->Lun
, cbw
->Flags
, cbw
->Length
);
2184 * We can do anything we want here, so let's stall the
2185 * bulk pipes if we are allowed to.
2187 if (common
->can_stall
) {
2188 fsg_set_halt(fsg
, fsg
->bulk_out
);
2189 halt_bulk_in_endpoint(fsg
);
2194 /* Save the command for later */
2195 common
->cmnd_size
= cbw
->Length
;
2196 memcpy(common
->cmnd
, cbw
->CDB
, common
->cmnd_size
);
2197 if (cbw
->Flags
& US_BULK_FLAG_IN
)
2198 common
->data_dir
= DATA_DIR_TO_HOST
;
2200 common
->data_dir
= DATA_DIR_FROM_HOST
;
2201 common
->data_size
= le32_to_cpu(cbw
->DataTransferLength
);
2202 if (common
->data_size
== 0)
2203 common
->data_dir
= DATA_DIR_NONE
;
2204 common
->lun
= cbw
->Lun
;
2205 if (common
->lun
>= 0 && common
->lun
< common
->nluns
)
2206 common
->curlun
= &common
->luns
[common
->lun
];
2208 common
->curlun
= NULL
;
2209 common
->tag
= cbw
->Tag
;
2213 static int get_next_command(struct fsg_common
*common
)
2215 struct fsg_buffhd
*bh
;
2218 /* Wait for the next buffer to become available */
2219 bh
= common
->next_buffhd_to_fill
;
2220 while (bh
->state
!= BUF_STATE_EMPTY
) {
2221 rc
= sleep_thread(common
);
2226 /* Queue a request to read a Bulk-only CBW */
2227 set_bulk_out_req_length(common
, bh
, US_BULK_CB_WRAP_LEN
);
2228 if (!start_out_transfer(common
, bh
))
2229 /* Don't know what to do if common->fsg is NULL */
2233 * We will drain the buffer in software, which means we
2234 * can reuse it for the next filling. No need to advance
2235 * next_buffhd_to_fill.
2238 /* Wait for the CBW to arrive */
2239 while (bh
->state
!= BUF_STATE_FULL
) {
2240 rc
= sleep_thread(common
);
2245 rc
= fsg_is_set(common
) ? received_cbw(common
->fsg
, bh
) : -EIO
;
2246 bh
->state
= BUF_STATE_EMPTY
;
2252 /*-------------------------------------------------------------------------*/
2254 static int alloc_request(struct fsg_common
*common
, struct usb_ep
*ep
,
2255 struct usb_request
**preq
)
2257 *preq
= usb_ep_alloc_request(ep
, GFP_ATOMIC
);
2260 ERROR(common
, "can't allocate request for %s\n", ep
->name
);
2264 /* Reset interface setting and re-init endpoint state (toggle etc). */
2265 static int do_set_interface(struct fsg_common
*common
, struct fsg_dev
*new_fsg
)
2267 struct fsg_dev
*fsg
;
2270 if (common
->running
)
2271 DBG(common
, "reset interface\n");
2274 /* Deallocate the requests */
2278 for (i
= 0; i
< fsg_num_buffers
; ++i
) {
2279 struct fsg_buffhd
*bh
= &common
->buffhds
[i
];
2282 usb_ep_free_request(fsg
->bulk_in
, bh
->inreq
);
2286 usb_ep_free_request(fsg
->bulk_out
, bh
->outreq
);
2291 /* Disable the endpoints */
2292 if (fsg
->bulk_in_enabled
) {
2293 usb_ep_disable(fsg
->bulk_in
);
2294 fsg
->bulk_in_enabled
= 0;
2296 if (fsg
->bulk_out_enabled
) {
2297 usb_ep_disable(fsg
->bulk_out
);
2298 fsg
->bulk_out_enabled
= 0;
2302 wake_up(&common
->fsg_wait
);
2305 common
->running
= 0;
2309 common
->fsg
= new_fsg
;
2312 /* Enable the endpoints */
2313 rc
= config_ep_by_speed(common
->gadget
, &(fsg
->function
), fsg
->bulk_in
);
2316 rc
= usb_ep_enable(fsg
->bulk_in
);
2319 fsg
->bulk_in
->driver_data
= common
;
2320 fsg
->bulk_in_enabled
= 1;
2322 rc
= config_ep_by_speed(common
->gadget
, &(fsg
->function
),
2326 rc
= usb_ep_enable(fsg
->bulk_out
);
2329 fsg
->bulk_out
->driver_data
= common
;
2330 fsg
->bulk_out_enabled
= 1;
2331 common
->bulk_out_maxpacket
= usb_endpoint_maxp(fsg
->bulk_out
->desc
);
2332 clear_bit(IGNORE_BULK_OUT
, &fsg
->atomic_bitflags
);
2334 /* Allocate the requests */
2335 for (i
= 0; i
< fsg_num_buffers
; ++i
) {
2336 struct fsg_buffhd
*bh
= &common
->buffhds
[i
];
2338 rc
= alloc_request(common
, fsg
->bulk_in
, &bh
->inreq
);
2341 rc
= alloc_request(common
, fsg
->bulk_out
, &bh
->outreq
);
2344 bh
->inreq
->buf
= bh
->outreq
->buf
= bh
->buf
;
2345 bh
->inreq
->context
= bh
->outreq
->context
= bh
;
2346 bh
->inreq
->complete
= bulk_in_complete
;
2347 bh
->outreq
->complete
= bulk_out_complete
;
2350 common
->running
= 1;
2351 for (i
= 0; i
< common
->nluns
; ++i
)
2352 common
->luns
[i
].unit_attention_data
= SS_RESET_OCCURRED
;
2357 /****************************** ALT CONFIGS ******************************/
2359 static int fsg_set_alt(struct usb_function
*f
, unsigned intf
, unsigned alt
)
2361 struct fsg_dev
*fsg
= fsg_from_func(f
);
2362 fsg
->common
->new_fsg
= fsg
;
2363 raise_exception(fsg
->common
, FSG_STATE_CONFIG_CHANGE
);
2364 return USB_GADGET_DELAYED_STATUS
;
2367 static void fsg_disable(struct usb_function
*f
)
2369 struct fsg_dev
*fsg
= fsg_from_func(f
);
2370 fsg
->common
->new_fsg
= NULL
;
2371 raise_exception(fsg
->common
, FSG_STATE_CONFIG_CHANGE
);
2375 /*-------------------------------------------------------------------------*/
2377 static void handle_exception(struct fsg_common
*common
)
2381 struct fsg_buffhd
*bh
;
2382 enum fsg_state old_state
;
2383 struct fsg_lun
*curlun
;
2384 unsigned int exception_req_tag
;
2387 * Clear the existing signals. Anything but SIGUSR1 is converted
2388 * into a high-priority EXIT exception.
2392 dequeue_signal_lock(current
, ¤t
->blocked
, &info
);
2395 if (sig
!= SIGUSR1
) {
2396 if (common
->state
< FSG_STATE_EXIT
)
2397 DBG(common
, "Main thread exiting on signal\n");
2398 raise_exception(common
, FSG_STATE_EXIT
);
2402 /* Cancel all the pending transfers */
2403 if (likely(common
->fsg
)) {
2404 for (i
= 0; i
< fsg_num_buffers
; ++i
) {
2405 bh
= &common
->buffhds
[i
];
2407 usb_ep_dequeue(common
->fsg
->bulk_in
, bh
->inreq
);
2408 if (bh
->outreq_busy
)
2409 usb_ep_dequeue(common
->fsg
->bulk_out
,
2413 /* Wait until everything is idle */
2416 for (i
= 0; i
< fsg_num_buffers
; ++i
) {
2417 bh
= &common
->buffhds
[i
];
2418 num_active
+= bh
->inreq_busy
+ bh
->outreq_busy
;
2420 if (num_active
== 0)
2422 if (sleep_thread(common
))
2426 /* Clear out the controller's fifos */
2427 if (common
->fsg
->bulk_in_enabled
)
2428 usb_ep_fifo_flush(common
->fsg
->bulk_in
);
2429 if (common
->fsg
->bulk_out_enabled
)
2430 usb_ep_fifo_flush(common
->fsg
->bulk_out
);
2434 * Reset the I/O buffer states and pointers, the SCSI
2435 * state, and the exception. Then invoke the handler.
2437 spin_lock_irq(&common
->lock
);
2439 for (i
= 0; i
< fsg_num_buffers
; ++i
) {
2440 bh
= &common
->buffhds
[i
];
2441 bh
->state
= BUF_STATE_EMPTY
;
2443 common
->next_buffhd_to_fill
= &common
->buffhds
[0];
2444 common
->next_buffhd_to_drain
= &common
->buffhds
[0];
2445 exception_req_tag
= common
->exception_req_tag
;
2446 old_state
= common
->state
;
2448 if (old_state
== FSG_STATE_ABORT_BULK_OUT
)
2449 common
->state
= FSG_STATE_STATUS_PHASE
;
2451 for (i
= 0; i
< common
->nluns
; ++i
) {
2452 curlun
= &common
->luns
[i
];
2453 curlun
->prevent_medium_removal
= 0;
2454 curlun
->sense_data
= SS_NO_SENSE
;
2455 curlun
->unit_attention_data
= SS_NO_SENSE
;
2456 curlun
->sense_data_info
= 0;
2457 curlun
->info_valid
= 0;
2459 common
->state
= FSG_STATE_IDLE
;
2461 spin_unlock_irq(&common
->lock
);
2463 /* Carry out any extra actions required for the exception */
2464 switch (old_state
) {
2465 case FSG_STATE_ABORT_BULK_OUT
:
2466 send_status(common
);
2467 spin_lock_irq(&common
->lock
);
2468 if (common
->state
== FSG_STATE_STATUS_PHASE
)
2469 common
->state
= FSG_STATE_IDLE
;
2470 spin_unlock_irq(&common
->lock
);
2473 case FSG_STATE_RESET
:
2475 * In case we were forced against our will to halt a
2476 * bulk endpoint, clear the halt now. (The SuperH UDC
2479 if (!fsg_is_set(common
))
2481 if (test_and_clear_bit(IGNORE_BULK_OUT
,
2482 &common
->fsg
->atomic_bitflags
))
2483 usb_ep_clear_halt(common
->fsg
->bulk_in
);
2485 if (common
->ep0_req_tag
== exception_req_tag
)
2486 ep0_queue(common
); /* Complete the status stage */
2489 * Technically this should go here, but it would only be
2490 * a waste of time. Ditto for the INTERFACE_CHANGE and
2491 * CONFIG_CHANGE cases.
2493 /* for (i = 0; i < common->nluns; ++i) */
2494 /* common->luns[i].unit_attention_data = */
2495 /* SS_RESET_OCCURRED; */
2498 case FSG_STATE_CONFIG_CHANGE
:
2499 do_set_interface(common
, common
->new_fsg
);
2500 if (common
->new_fsg
)
2501 usb_composite_setup_continue(common
->cdev
);
2504 case FSG_STATE_EXIT
:
2505 case FSG_STATE_TERMINATED
:
2506 do_set_interface(common
, NULL
); /* Free resources */
2507 spin_lock_irq(&common
->lock
);
2508 common
->state
= FSG_STATE_TERMINATED
; /* Stop the thread */
2509 spin_unlock_irq(&common
->lock
);
2512 case FSG_STATE_INTERFACE_CHANGE
:
2513 case FSG_STATE_DISCONNECT
:
2514 case FSG_STATE_COMMAND_PHASE
:
2515 case FSG_STATE_DATA_PHASE
:
2516 case FSG_STATE_STATUS_PHASE
:
2517 case FSG_STATE_IDLE
:
2523 /*-------------------------------------------------------------------------*/
2525 static int fsg_main_thread(void *common_
)
2527 struct fsg_common
*common
= common_
;
2530 * Allow the thread to be killed by a signal, but set the signal mask
2531 * to block everything but INT, TERM, KILL, and USR1.
2533 allow_signal(SIGINT
);
2534 allow_signal(SIGTERM
);
2535 allow_signal(SIGKILL
);
2536 allow_signal(SIGUSR1
);
2538 /* Allow the thread to be frozen */
2542 * Arrange for userspace references to be interpreted as kernel
2543 * pointers. That way we can pass a kernel pointer to a routine
2544 * that expects a __user pointer and it will work okay.
2549 while (common
->state
!= FSG_STATE_TERMINATED
) {
2550 if (exception_in_progress(common
) || signal_pending(current
)) {
2551 handle_exception(common
);
2555 if (!common
->running
) {
2556 sleep_thread(common
);
2560 if (get_next_command(common
))
2563 spin_lock_irq(&common
->lock
);
2564 if (!exception_in_progress(common
))
2565 common
->state
= FSG_STATE_DATA_PHASE
;
2566 spin_unlock_irq(&common
->lock
);
2568 if (do_scsi_command(common
) || finish_reply(common
))
2571 spin_lock_irq(&common
->lock
);
2572 if (!exception_in_progress(common
))
2573 common
->state
= FSG_STATE_STATUS_PHASE
;
2574 spin_unlock_irq(&common
->lock
);
2576 if (send_status(common
))
2579 spin_lock_irq(&common
->lock
);
2580 if (!exception_in_progress(common
))
2581 common
->state
= FSG_STATE_IDLE
;
2582 spin_unlock_irq(&common
->lock
);
2585 spin_lock_irq(&common
->lock
);
2586 common
->thread_task
= NULL
;
2587 spin_unlock_irq(&common
->lock
);
2589 if (!common
->ops
|| !common
->ops
->thread_exits
2590 || common
->ops
->thread_exits(common
) < 0) {
2591 struct fsg_lun
*curlun
= common
->luns
;
2592 unsigned i
= common
->nluns
;
2594 down_write(&common
->filesem
);
2595 for (; i
--; ++curlun
) {
2596 if (!fsg_lun_is_open(curlun
))
2599 fsg_lun_close(curlun
);
2600 curlun
->unit_attention_data
= SS_MEDIUM_NOT_PRESENT
;
2602 up_write(&common
->filesem
);
2605 /* Let fsg_unbind() know the thread has exited */
2606 complete_and_exit(&common
->thread_notifier
, 0);
2610 /*************************** DEVICE ATTRIBUTES ***************************/
2612 static DEVICE_ATTR(ro
, 0644, fsg_show_ro
, fsg_store_ro
);
2613 static DEVICE_ATTR(nofua
, 0644, fsg_show_nofua
, fsg_store_nofua
);
2614 static DEVICE_ATTR(file
, 0644, fsg_show_file
, fsg_store_file
);
2616 static struct device_attribute dev_attr_ro_cdrom
=
2617 __ATTR(ro
, 0444, fsg_show_ro
, NULL
);
2618 static struct device_attribute dev_attr_file_nonremovable
=
2619 __ATTR(file
, 0444, fsg_show_file
, NULL
);
2622 /****************************** FSG COMMON ******************************/
2624 static void fsg_common_release(struct kref
*ref
);
2626 static void fsg_lun_release(struct device
*dev
)
2628 /* Nothing needs to be done */
2631 static inline void fsg_common_get(struct fsg_common
*common
)
2633 kref_get(&common
->ref
);
2636 static inline void fsg_common_put(struct fsg_common
*common
)
2638 kref_put(&common
->ref
, fsg_common_release
);
2641 static struct fsg_common
*fsg_common_init(struct fsg_common
*common
,
2642 struct usb_composite_dev
*cdev
,
2643 struct fsg_config
*cfg
)
2645 struct usb_gadget
*gadget
= cdev
->gadget
;
2646 struct fsg_buffhd
*bh
;
2647 struct fsg_lun
*curlun
;
2648 struct fsg_lun_config
*lcfg
;
2652 rc
= fsg_num_buffers_validate();
2656 /* Find out how many LUNs there should be */
2658 if (nluns
< 1 || nluns
> FSG_MAX_LUNS
) {
2659 dev_err(&gadget
->dev
, "invalid number of LUNs: %u\n", nluns
);
2660 return ERR_PTR(-EINVAL
);
2665 common
= kzalloc(sizeof *common
, GFP_KERNEL
);
2667 return ERR_PTR(-ENOMEM
);
2668 common
->free_storage_on_release
= 1;
2670 memset(common
, 0, sizeof *common
);
2671 common
->free_storage_on_release
= 0;
2674 common
->buffhds
= kcalloc(fsg_num_buffers
,
2675 sizeof *(common
->buffhds
), GFP_KERNEL
);
2676 if (!common
->buffhds
) {
2677 if (common
->free_storage_on_release
)
2679 return ERR_PTR(-ENOMEM
);
2682 common
->ops
= cfg
->ops
;
2683 common
->private_data
= cfg
->private_data
;
2685 common
->gadget
= gadget
;
2686 common
->ep0
= gadget
->ep0
;
2687 common
->ep0req
= cdev
->req
;
2688 common
->cdev
= cdev
;
2690 /* Maybe allocate device-global string IDs, and patch descriptors */
2691 if (fsg_strings
[FSG_STRING_INTERFACE
].id
== 0) {
2692 rc
= usb_string_id(cdev
);
2693 if (unlikely(rc
< 0))
2695 fsg_strings
[FSG_STRING_INTERFACE
].id
= rc
;
2696 fsg_intf_desc
.iInterface
= rc
;
2700 * Create the LUNs, open their backing files, and register the
2701 * LUN devices in sysfs.
2703 curlun
= kcalloc(nluns
, sizeof(*curlun
), GFP_KERNEL
);
2704 if (unlikely(!curlun
)) {
2708 common
->luns
= curlun
;
2710 init_rwsem(&common
->filesem
);
2712 for (i
= 0, lcfg
= cfg
->luns
; i
< nluns
; ++i
, ++curlun
, ++lcfg
) {
2713 curlun
->cdrom
= !!lcfg
->cdrom
;
2714 curlun
->ro
= lcfg
->cdrom
|| lcfg
->ro
;
2715 curlun
->initially_ro
= curlun
->ro
;
2716 curlun
->removable
= lcfg
->removable
;
2717 curlun
->dev
.release
= fsg_lun_release
;
2718 curlun
->dev
.parent
= &gadget
->dev
;
2719 /* curlun->dev.driver = &fsg_driver.driver; XXX */
2720 dev_set_drvdata(&curlun
->dev
, &common
->filesem
);
2721 dev_set_name(&curlun
->dev
, "lun%d", i
);
2723 rc
= device_register(&curlun
->dev
);
2725 INFO(common
, "failed to register LUN%d: %d\n", i
, rc
);
2727 put_device(&curlun
->dev
);
2731 rc
= device_create_file(&curlun
->dev
,
2733 ? &dev_attr_ro_cdrom
2737 rc
= device_create_file(&curlun
->dev
,
2740 : &dev_attr_file_nonremovable
);
2743 rc
= device_create_file(&curlun
->dev
, &dev_attr_nofua
);
2747 if (lcfg
->filename
) {
2748 rc
= fsg_lun_open(curlun
, lcfg
->filename
);
2751 } else if (!curlun
->removable
) {
2752 ERROR(common
, "no file given for LUN%d\n", i
);
2757 common
->nluns
= nluns
;
2759 /* Data buffers cyclic list */
2760 bh
= common
->buffhds
;
2761 i
= fsg_num_buffers
;
2762 goto buffhds_first_it
;
2767 bh
->buf
= kmalloc(FSG_BUFLEN
, GFP_KERNEL
);
2768 if (unlikely(!bh
->buf
)) {
2773 bh
->next
= common
->buffhds
;
2775 /* Prepare inquiryString */
2776 if (cfg
->release
!= 0xffff) {
2779 i
= usb_gadget_controller_number(gadget
);
2783 WARNING(common
, "controller '%s' not recognized\n",
2788 snprintf(common
->inquiry_string
, sizeof common
->inquiry_string
,
2789 "%-8s%-16s%04x", cfg
->vendor_name
?: "Linux",
2790 /* Assume product name dependent on the first LUN */
2791 cfg
->product_name
?: (common
->luns
->cdrom
2792 ? "File-Stor Gadget"
2793 : "File-CD Gadget"),
2797 * Some peripheral controllers are known not to be able to
2798 * halt bulk endpoints correctly. If one of them is present,
2801 common
->can_stall
= cfg
->can_stall
&&
2802 !(gadget_is_at91(common
->gadget
));
2804 spin_lock_init(&common
->lock
);
2805 kref_init(&common
->ref
);
2807 /* Tell the thread to start working */
2808 common
->thread_task
=
2809 kthread_create(fsg_main_thread
, common
, "file-storage");
2810 if (IS_ERR(common
->thread_task
)) {
2811 rc
= PTR_ERR(common
->thread_task
);
2814 init_completion(&common
->thread_notifier
);
2815 init_waitqueue_head(&common
->fsg_wait
);
2818 INFO(common
, FSG_DRIVER_DESC
", version: " FSG_DRIVER_VERSION
"\n");
2819 INFO(common
, "Number of LUNs=%d\n", common
->nluns
);
2821 pathbuf
= kmalloc(PATH_MAX
, GFP_KERNEL
);
2822 for (i
= 0, nluns
= common
->nluns
, curlun
= common
->luns
;
2825 char *p
= "(no medium)";
2826 if (fsg_lun_is_open(curlun
)) {
2829 p
= d_path(&curlun
->filp
->f_path
,
2835 LINFO(curlun
, "LUN: %s%s%sfile: %s\n",
2836 curlun
->removable
? "removable " : "",
2837 curlun
->ro
? "read only " : "",
2838 curlun
->cdrom
? "CD-ROM " : "",
2843 DBG(common
, "I/O thread pid: %d\n", task_pid_nr(common
->thread_task
));
2845 wake_up_process(common
->thread_task
);
2850 common
->nluns
= i
+ 1;
2852 common
->state
= FSG_STATE_TERMINATED
; /* The thread is dead */
2853 /* Call fsg_common_release() directly, ref might be not initialised. */
2854 fsg_common_release(&common
->ref
);
2858 static void fsg_common_release(struct kref
*ref
)
2860 struct fsg_common
*common
= container_of(ref
, struct fsg_common
, ref
);
2862 /* If the thread isn't already dead, tell it to exit now */
2863 if (common
->state
!= FSG_STATE_TERMINATED
) {
2864 raise_exception(common
, FSG_STATE_EXIT
);
2865 wait_for_completion(&common
->thread_notifier
);
2868 if (likely(common
->luns
)) {
2869 struct fsg_lun
*lun
= common
->luns
;
2870 unsigned i
= common
->nluns
;
2872 /* In error recovery common->nluns may be zero. */
2873 for (; i
; --i
, ++lun
) {
2874 device_remove_file(&lun
->dev
, &dev_attr_nofua
);
2875 device_remove_file(&lun
->dev
,
2877 ? &dev_attr_ro_cdrom
2879 device_remove_file(&lun
->dev
,
2882 : &dev_attr_file_nonremovable
);
2884 device_unregister(&lun
->dev
);
2887 kfree(common
->luns
);
2891 struct fsg_buffhd
*bh
= common
->buffhds
;
2892 unsigned i
= fsg_num_buffers
;
2895 } while (++bh
, --i
);
2898 kfree(common
->buffhds
);
2899 if (common
->free_storage_on_release
)
2904 /*-------------------------------------------------------------------------*/
2906 static void fsg_unbind(struct usb_configuration
*c
, struct usb_function
*f
)
2908 struct fsg_dev
*fsg
= fsg_from_func(f
);
2909 struct fsg_common
*common
= fsg
->common
;
2911 DBG(fsg
, "unbind\n");
2912 if (fsg
->common
->fsg
== fsg
) {
2913 fsg
->common
->new_fsg
= NULL
;
2914 raise_exception(fsg
->common
, FSG_STATE_CONFIG_CHANGE
);
2915 /* FIXME: make interruptible or killable somehow? */
2916 wait_event(common
->fsg_wait
, common
->fsg
!= fsg
);
2919 fsg_common_put(common
);
2920 usb_free_descriptors(fsg
->function
.descriptors
);
2921 usb_free_descriptors(fsg
->function
.hs_descriptors
);
2922 usb_free_descriptors(fsg
->function
.ss_descriptors
);
2926 static int fsg_bind(struct usb_configuration
*c
, struct usb_function
*f
)
2928 struct fsg_dev
*fsg
= fsg_from_func(f
);
2929 struct usb_gadget
*gadget
= c
->cdev
->gadget
;
2933 fsg
->gadget
= gadget
;
2936 i
= usb_interface_id(c
, f
);
2939 fsg_intf_desc
.bInterfaceNumber
= i
;
2940 fsg
->interface_number
= i
;
2942 /* Find all the endpoints we will use */
2943 ep
= usb_ep_autoconfig(gadget
, &fsg_fs_bulk_in_desc
);
2946 ep
->driver_data
= fsg
->common
; /* claim the endpoint */
2949 ep
= usb_ep_autoconfig(gadget
, &fsg_fs_bulk_out_desc
);
2952 ep
->driver_data
= fsg
->common
; /* claim the endpoint */
2955 /* Copy descriptors */
2956 f
->descriptors
= usb_copy_descriptors(fsg_fs_function
);
2957 if (unlikely(!f
->descriptors
))
2960 if (gadget_is_dualspeed(gadget
)) {
2961 /* Assume endpoint addresses are the same for both speeds */
2962 fsg_hs_bulk_in_desc
.bEndpointAddress
=
2963 fsg_fs_bulk_in_desc
.bEndpointAddress
;
2964 fsg_hs_bulk_out_desc
.bEndpointAddress
=
2965 fsg_fs_bulk_out_desc
.bEndpointAddress
;
2966 f
->hs_descriptors
= usb_copy_descriptors(fsg_hs_function
);
2967 if (unlikely(!f
->hs_descriptors
)) {
2968 usb_free_descriptors(f
->descriptors
);
2973 if (gadget_is_superspeed(gadget
)) {
2976 /* Calculate bMaxBurst, we know packet size is 1024 */
2977 max_burst
= min_t(unsigned, FSG_BUFLEN
/ 1024, 15);
2979 fsg_ss_bulk_in_desc
.bEndpointAddress
=
2980 fsg_fs_bulk_in_desc
.bEndpointAddress
;
2981 fsg_ss_bulk_in_comp_desc
.bMaxBurst
= max_burst
;
2983 fsg_ss_bulk_out_desc
.bEndpointAddress
=
2984 fsg_fs_bulk_out_desc
.bEndpointAddress
;
2985 fsg_ss_bulk_out_comp_desc
.bMaxBurst
= max_burst
;
2987 f
->ss_descriptors
= usb_copy_descriptors(fsg_ss_function
);
2988 if (unlikely(!f
->ss_descriptors
)) {
2989 usb_free_descriptors(f
->hs_descriptors
);
2990 usb_free_descriptors(f
->descriptors
);
2998 ERROR(fsg
, "unable to autoconfigure all endpoints\n");
3003 /****************************** ADD FUNCTION ******************************/
3005 static struct usb_gadget_strings
*fsg_strings_array
[] = {
3010 static int fsg_bind_config(struct usb_composite_dev
*cdev
,
3011 struct usb_configuration
*c
,
3012 struct fsg_common
*common
)
3014 struct fsg_dev
*fsg
;
3017 fsg
= kzalloc(sizeof *fsg
, GFP_KERNEL
);
3021 fsg
->function
.name
= FSG_DRIVER_DESC
;
3022 fsg
->function
.strings
= fsg_strings_array
;
3023 fsg
->function
.bind
= fsg_bind
;
3024 fsg
->function
.unbind
= fsg_unbind
;
3025 fsg
->function
.setup
= fsg_setup
;
3026 fsg
->function
.set_alt
= fsg_set_alt
;
3027 fsg
->function
.disable
= fsg_disable
;
3029 fsg
->common
= common
;
3031 * Our caller holds a reference to common structure so we
3032 * don't have to be worry about it being freed until we return
3033 * from this function. So instead of incrementing counter now
3034 * and decrement in error recovery we increment it only when
3035 * call to usb_add_function() was successful.
3038 rc
= usb_add_function(c
, &fsg
->function
);
3042 fsg_common_get(fsg
->common
);
3047 /************************* Module parameters *************************/
3049 struct fsg_module_parameters
{
3050 char *file
[FSG_MAX_LUNS
];
3051 bool ro
[FSG_MAX_LUNS
];
3052 bool removable
[FSG_MAX_LUNS
];
3053 bool cdrom
[FSG_MAX_LUNS
];
3054 bool nofua
[FSG_MAX_LUNS
];
3056 unsigned int file_count
, ro_count
, removable_count
, cdrom_count
;
3057 unsigned int nofua_count
;
3058 unsigned int luns
; /* nluns */
3059 bool stall
; /* can_stall */
3062 #define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc) \
3063 module_param_array_named(prefix ## name, params.name, type, \
3064 &prefix ## params.name ## _count, \
3066 MODULE_PARM_DESC(prefix ## name, desc)
3068 #define _FSG_MODULE_PARAM(prefix, params, name, type, desc) \
3069 module_param_named(prefix ## name, params.name, type, \
3071 MODULE_PARM_DESC(prefix ## name, desc)
3073 #define FSG_MODULE_PARAMETERS(prefix, params) \
3074 _FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp, \
3075 "names of backing files or devices"); \
3076 _FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool, \
3077 "true to force read-only"); \
3078 _FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool, \
3079 "true to simulate removable media"); \
3080 _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool, \
3081 "true to simulate CD-ROM instead of disk"); \
3082 _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool, \
3083 "true to ignore SCSI WRITE(10,12) FUA bit"); \
3084 _FSG_MODULE_PARAM(prefix, params, luns, uint, \
3085 "number of LUNs"); \
3086 _FSG_MODULE_PARAM(prefix, params, stall, bool, \
3087 "false to prevent bulk stalls")
3090 fsg_config_from_params(struct fsg_config
*cfg
,
3091 const struct fsg_module_parameters
*params
)
3093 struct fsg_lun_config
*lun
;
3096 /* Configure LUNs */
3098 min(params
->luns
?: (params
->file_count
?: 1u),
3099 (unsigned)FSG_MAX_LUNS
);
3100 for (i
= 0, lun
= cfg
->luns
; i
< cfg
->nluns
; ++i
, ++lun
) {
3101 lun
->ro
= !!params
->ro
[i
];
3102 lun
->cdrom
= !!params
->cdrom
[i
];
3103 lun
->removable
= !!params
->removable
[i
];
3105 params
->file_count
> i
&& params
->file
[i
][0]
3110 /* Let MSF use defaults */
3111 cfg
->vendor_name
= 0;
3112 cfg
->product_name
= 0;
3113 cfg
->release
= 0xffff;
3116 cfg
->private_data
= NULL
;
3119 cfg
->can_stall
= params
->stall
;
3122 static inline struct fsg_common
*
3123 fsg_common_from_params(struct fsg_common
*common
,
3124 struct usb_composite_dev
*cdev
,
3125 const struct fsg_module_parameters
*params
)
3126 __attribute__((unused
));
3127 static inline struct fsg_common
*
3128 fsg_common_from_params(struct fsg_common
*common
,
3129 struct usb_composite_dev
*cdev
,
3130 const struct fsg_module_parameters
*params
)
3132 struct fsg_config cfg
;
3133 fsg_config_from_params(&cfg
, params
);
3134 return fsg_common_init(common
, cdev
, &cfg
);