Sebastian Andrzej Siewior | e220ff7 | 2012-09-06 20:11:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * f_mass_storage.c -- Mass Storage USB Composite Function |
| 3 | * |
| 4 | * Copyright (C) 2003-2008 Alan Stern |
| 5 | * Copyright (C) 2009 Samsung Electronics |
| 6 | * Author: Michal Nazarewicz <mina86@mina86.com> |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 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. |
| 21 | * |
| 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 |
| 25 | * later version. |
| 26 | * |
| 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. |
| 38 | */ |
| 39 | |
| 40 | /* |
| 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. |
| 46 | * |
| 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. |
| 50 | */ |
| 51 | |
| 52 | /* |
| 53 | * MSF is configured by specifying a fsg_config structure. It has the |
| 54 | * following fields: |
| 55 | * |
| 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 |
| 65 | * removable. |
| 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" |
| 70 | * in R/W mode. |
| 71 | * ->removable Flag specifying that LUN shall be indicated as |
| 72 | * being removable. |
| 73 | * ->cdrom Flag specifying that LUN shall be reported as |
| 74 | * being a CD-ROM. |
| 75 | * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12) |
| 76 | * commands for this LUN shall be ignored. |
| 77 | * |
| 78 | * vendor_name |
| 79 | * product_name |
| 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 |
| 84 | * characters or less. |
| 85 | * |
| 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 |
| 89 | * to true. |
| 90 | * |
| 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. |
| 97 | * |
| 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, |
| 107 | * available at |
| 108 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>. |
| 109 | */ |
| 110 | |
| 111 | /* |
| 112 | * Driver Design |
| 113 | * |
| 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). |
| 123 | * |
| 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 |
| 134 | * an EXIT exception. |
| 135 | * |
| 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. |
| 142 | * |
| 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 |
| 151 | * variables. |
| 152 | * |
| 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). |
| 163 | * |
| 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. |
| 175 | * |
| 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. |
| 190 | * |
| 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. |
| 194 | */ |
| 195 | |
| 196 | |
| 197 | /* #define VERBOSE_DEBUG */ |
| 198 | /* #define DUMP_MSGS */ |
| 199 | |
| 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> |
| 217 | |
| 218 | #include <linux/usb/ch9.h> |
| 219 | #include <linux/usb/gadget.h> |
| 220 | #include <linux/usb/composite.h> |
| 221 | |
| 222 | #include "gadget_chips.h" |
| 223 | |
| 224 | |
| 225 | /*------------------------------------------------------------------------*/ |
| 226 | |
| 227 | #define FSG_DRIVER_DESC "Mass Storage Function" |
| 228 | #define FSG_DRIVER_VERSION "2009/09/11" |
| 229 | |
| 230 | static const char fsg_string_interface[] = "Mass Storage"; |
| 231 | |
| 232 | #define FSG_NO_DEVICE_STRINGS 1 |
| 233 | #define FSG_NO_OTG 1 |
| 234 | #define FSG_NO_INTR_EP 1 |
| 235 | |
| 236 | #include "storage_common.c" |
| 237 | |
| 238 | |
| 239 | /*-------------------------------------------------------------------------*/ |
| 240 | |
| 241 | struct fsg_dev; |
| 242 | struct fsg_common; |
| 243 | |
| 244 | /* FSF callback functions */ |
| 245 | struct fsg_operations { |
| 246 | /* |
| 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 |
| 251 | * set). |
| 252 | */ |
| 253 | int (*thread_exits)(struct fsg_common *common); |
| 254 | |
| 255 | /* |
| 256 | * Called prior to ejection. Negative return means error, |
| 257 | * zero means to continue with ejection, positive means not to |
| 258 | * eject. |
| 259 | */ |
| 260 | int (*pre_eject)(struct fsg_common *common, |
| 261 | struct fsg_lun *lun, int num); |
| 262 | /* |
| 263 | * Called after ejection. Negative return means error, zero |
| 264 | * or positive is just a success. |
| 265 | */ |
| 266 | int (*post_eject)(struct fsg_common *common, |
| 267 | struct fsg_lun *lun, int num); |
| 268 | }; |
| 269 | |
| 270 | /* Data shared by all the FSG instances. */ |
| 271 | struct fsg_common { |
| 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; |
| 276 | |
| 277 | /* filesem protects: backing files in use */ |
| 278 | struct rw_semaphore filesem; |
| 279 | |
| 280 | /* lock protects: state, all the req_busy's */ |
| 281 | spinlock_t lock; |
| 282 | |
| 283 | struct usb_ep *ep0; /* Copy of gadget->ep0 */ |
| 284 | struct usb_request *ep0req; /* Copy of cdev->req */ |
| 285 | unsigned int ep0_req_tag; |
| 286 | |
| 287 | struct fsg_buffhd *next_buffhd_to_fill; |
| 288 | struct fsg_buffhd *next_buffhd_to_drain; |
| 289 | struct fsg_buffhd *buffhds; |
| 290 | |
| 291 | int cmnd_size; |
| 292 | u8 cmnd[MAX_COMMAND_SIZE]; |
| 293 | |
| 294 | unsigned int nluns; |
| 295 | unsigned int lun; |
| 296 | struct fsg_lun *luns; |
| 297 | struct fsg_lun *curlun; |
| 298 | |
| 299 | unsigned int bulk_out_maxpacket; |
| 300 | enum fsg_state state; /* For exception handling */ |
| 301 | unsigned int exception_req_tag; |
| 302 | |
| 303 | enum data_direction data_dir; |
| 304 | u32 data_size; |
| 305 | u32 data_size_from_cmnd; |
| 306 | u32 tag; |
| 307 | u32 residue; |
| 308 | u32 usb_amount_left; |
| 309 | |
| 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; |
| 316 | |
| 317 | int thread_wakeup_needed; |
| 318 | struct completion thread_notifier; |
| 319 | struct task_struct *thread_task; |
| 320 | |
| 321 | /* Callback functions. */ |
| 322 | const struct fsg_operations *ops; |
| 323 | /* Gadget's private data. */ |
| 324 | void *private_data; |
| 325 | |
| 326 | /* |
| 327 | * Vendor (8 chars), product (16 chars), release (4 |
| 328 | * hexadecimal digits) and NUL byte |
| 329 | */ |
| 330 | char inquiry_string[8 + 16 + 4 + 1]; |
| 331 | |
| 332 | struct kref ref; |
| 333 | }; |
| 334 | |
| 335 | struct fsg_config { |
| 336 | unsigned nluns; |
| 337 | struct fsg_lun_config { |
| 338 | const char *filename; |
| 339 | char ro; |
| 340 | char removable; |
| 341 | char cdrom; |
| 342 | char nofua; |
| 343 | } luns[FSG_MAX_LUNS]; |
| 344 | |
| 345 | /* Callback functions. */ |
| 346 | const struct fsg_operations *ops; |
| 347 | /* Gadget's private data. */ |
| 348 | void *private_data; |
| 349 | |
| 350 | const char *vendor_name; /* 8 characters or less */ |
| 351 | const char *product_name; /* 16 characters or less */ |
| 352 | u16 release; |
| 353 | |
| 354 | char can_stall; |
| 355 | }; |
| 356 | |
| 357 | struct fsg_dev { |
| 358 | struct usb_function function; |
| 359 | struct usb_gadget *gadget; /* Copy of cdev->gadget */ |
| 360 | struct fsg_common *common; |
| 361 | |
| 362 | u16 interface_number; |
| 363 | |
| 364 | unsigned int bulk_in_enabled:1; |
| 365 | unsigned int bulk_out_enabled:1; |
| 366 | |
| 367 | unsigned long atomic_bitflags; |
| 368 | #define IGNORE_BULK_OUT 0 |
| 369 | |
| 370 | struct usb_ep *bulk_in; |
| 371 | struct usb_ep *bulk_out; |
| 372 | }; |
| 373 | |
| 374 | static inline int __fsg_is_set(struct fsg_common *common, |
| 375 | const char *func, unsigned line) |
| 376 | { |
| 377 | if (common->fsg) |
| 378 | return 1; |
| 379 | ERROR(common, "common->fsg is NULL in %s at %u\n", func, line); |
| 380 | WARN_ON(1); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__)) |
| 385 | |
| 386 | static inline struct fsg_dev *fsg_from_func(struct usb_function *f) |
| 387 | { |
| 388 | return container_of(f, struct fsg_dev, function); |
| 389 | } |
| 390 | |
| 391 | typedef void (*fsg_routine_t)(struct fsg_dev *); |
| 392 | |
| 393 | static int exception_in_progress(struct fsg_common *common) |
| 394 | { |
| 395 | return common->state > FSG_STATE_IDLE; |
| 396 | } |
| 397 | |
| 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) |
| 401 | { |
| 402 | unsigned int rem; |
| 403 | |
| 404 | bh->bulk_out_intended_length = length; |
| 405 | rem = length % common->bulk_out_maxpacket; |
| 406 | if (rem > 0) |
| 407 | length += common->bulk_out_maxpacket - rem; |
| 408 | bh->outreq->length = length; |
| 409 | } |
| 410 | |
| 411 | |
| 412 | /*-------------------------------------------------------------------------*/ |
| 413 | |
| 414 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) |
| 415 | { |
| 416 | const char *name; |
| 417 | |
| 418 | if (ep == fsg->bulk_in) |
| 419 | name = "bulk-in"; |
| 420 | else if (ep == fsg->bulk_out) |
| 421 | name = "bulk-out"; |
| 422 | else |
| 423 | name = ep->name; |
| 424 | DBG(fsg, "%s set halt\n", name); |
| 425 | return usb_ep_set_halt(ep); |
| 426 | } |
| 427 | |
| 428 | |
| 429 | /*-------------------------------------------------------------------------*/ |
| 430 | |
| 431 | /* These routines may be called in process context or in_irq */ |
| 432 | |
| 433 | /* Caller must hold fsg->lock */ |
| 434 | static void wakeup_thread(struct fsg_common *common) |
| 435 | { |
| 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); |
| 440 | } |
| 441 | |
| 442 | static void raise_exception(struct fsg_common *common, enum fsg_state new_state) |
| 443 | { |
| 444 | unsigned long flags; |
| 445 | |
| 446 | /* |
| 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. |
| 450 | */ |
| 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); |
| 458 | } |
| 459 | spin_unlock_irqrestore(&common->lock, flags); |
| 460 | } |
| 461 | |
| 462 | |
| 463 | /*-------------------------------------------------------------------------*/ |
| 464 | |
| 465 | static int ep0_queue(struct fsg_common *common) |
| 466 | { |
| 467 | int rc; |
| 468 | |
| 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); |
| 475 | } |
| 476 | return rc; |
| 477 | } |
| 478 | |
| 479 | |
| 480 | /*-------------------------------------------------------------------------*/ |
| 481 | |
| 482 | /* Completion handlers. These always run in_irq. */ |
| 483 | |
| 484 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) |
| 485 | { |
| 486 | struct fsg_common *common = ep->driver_data; |
| 487 | struct fsg_buffhd *bh = req->context; |
| 488 | |
| 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); |
| 494 | |
| 495 | /* Hold the lock while we update the request and buffer states */ |
| 496 | smp_wmb(); |
| 497 | spin_lock(&common->lock); |
| 498 | bh->inreq_busy = 0; |
| 499 | bh->state = BUF_STATE_EMPTY; |
| 500 | wakeup_thread(common); |
| 501 | spin_unlock(&common->lock); |
| 502 | } |
| 503 | |
| 504 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) |
| 505 | { |
| 506 | struct fsg_common *common = ep->driver_data; |
| 507 | struct fsg_buffhd *bh = req->context; |
| 508 | |
| 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); |
| 515 | |
| 516 | /* Hold the lock while we update the request and buffer states */ |
| 517 | smp_wmb(); |
| 518 | spin_lock(&common->lock); |
| 519 | bh->outreq_busy = 0; |
| 520 | bh->state = BUF_STATE_FULL; |
| 521 | wakeup_thread(common); |
| 522 | spin_unlock(&common->lock); |
| 523 | } |
| 524 | |
| 525 | static int fsg_setup(struct usb_function *f, |
| 526 | const struct usb_ctrlrequest *ctrl) |
| 527 | { |
| 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); |
| 533 | |
| 534 | if (!fsg_is_set(fsg->common)) |
| 535 | return -EOPNOTSUPP; |
| 536 | |
| 537 | ++fsg->common->ep0_req_tag; /* Record arrival of a new request */ |
| 538 | req->context = NULL; |
| 539 | req->length = 0; |
| 540 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl)); |
| 541 | |
| 542 | switch (ctrl->bRequest) { |
| 543 | |
| 544 | case US_BULK_RESET_REQUEST: |
| 545 | if (ctrl->bRequestType != |
| 546 | (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) |
| 547 | break; |
| 548 | if (w_index != fsg->interface_number || w_value != 0 || |
| 549 | w_length != 0) |
| 550 | return -EDOM; |
| 551 | |
| 552 | /* |
| 553 | * Raise an exception to stop the current operation |
| 554 | * and reinitialize our state. |
| 555 | */ |
| 556 | DBG(fsg, "bulk reset request\n"); |
| 557 | raise_exception(fsg->common, FSG_STATE_RESET); |
| 558 | return DELAYED_STATUS; |
| 559 | |
| 560 | case US_BULK_GET_MAX_LUN: |
| 561 | if (ctrl->bRequestType != |
| 562 | (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE)) |
| 563 | break; |
| 564 | if (w_index != fsg->interface_number || w_value != 0 || |
| 565 | w_length != 1) |
| 566 | return -EDOM; |
| 567 | VDBG(fsg, "get max LUN\n"); |
| 568 | *(u8 *)req->buf = fsg->common->nluns - 1; |
| 569 | |
| 570 | /* Respond with data/status */ |
| 571 | req->length = min((u16)1, w_length); |
| 572 | return ep0_queue(fsg->common); |
| 573 | } |
| 574 | |
| 575 | VDBG(fsg, |
| 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); |
| 579 | return -EOPNOTSUPP; |
| 580 | } |
| 581 | |
| 582 | |
| 583 | /*-------------------------------------------------------------------------*/ |
| 584 | |
| 585 | /* All the following routines run in process context */ |
| 586 | |
| 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) |
| 591 | { |
| 592 | int rc; |
| 593 | |
| 594 | if (ep == fsg->bulk_in) |
| 595 | dump_msg(fsg, "bulk-in", req->buf, req->length); |
| 596 | |
| 597 | spin_lock_irq(&fsg->common->lock); |
| 598 | *pbusy = 1; |
| 599 | *state = BUF_STATE_BUSY; |
| 600 | spin_unlock_irq(&fsg->common->lock); |
| 601 | rc = usb_ep_queue(ep, req, GFP_KERNEL); |
| 602 | if (rc != 0) { |
| 603 | *pbusy = 0; |
| 604 | *state = BUF_STATE_EMPTY; |
| 605 | |
| 606 | /* We can't do much more than wait for a reset */ |
| 607 | |
| 608 | /* |
| 609 | * Note: currently the net2280 driver fails zero-length |
| 610 | * submissions if DMA is enabled. |
| 611 | */ |
| 612 | if (rc != -ESHUTDOWN && |
| 613 | !(rc == -EOPNOTSUPP && req->length == 0)) |
| 614 | WARNING(fsg, "error in submission: %s --> %d\n", |
| 615 | ep->name, rc); |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
| 620 | { |
| 621 | if (!fsg_is_set(common)) |
| 622 | return false; |
| 623 | start_transfer(common->fsg, common->fsg->bulk_in, |
| 624 | bh->inreq, &bh->inreq_busy, &bh->state); |
| 625 | return true; |
| 626 | } |
| 627 | |
| 628 | static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) |
| 629 | { |
| 630 | if (!fsg_is_set(common)) |
| 631 | return false; |
| 632 | start_transfer(common->fsg, common->fsg->bulk_out, |
| 633 | bh->outreq, &bh->outreq_busy, &bh->state); |
| 634 | return true; |
| 635 | } |
| 636 | |
| 637 | static int sleep_thread(struct fsg_common *common) |
| 638 | { |
| 639 | int rc = 0; |
| 640 | |
| 641 | /* Wait until a signal arrives or we are woken up */ |
| 642 | for (;;) { |
| 643 | try_to_freeze(); |
| 644 | set_current_state(TASK_INTERRUPTIBLE); |
| 645 | if (signal_pending(current)) { |
| 646 | rc = -EINTR; |
| 647 | break; |
| 648 | } |
| 649 | if (common->thread_wakeup_needed) |
| 650 | break; |
| 651 | schedule(); |
| 652 | } |
| 653 | __set_current_state(TASK_RUNNING); |
| 654 | common->thread_wakeup_needed = 0; |
| 655 | return rc; |
| 656 | } |
| 657 | |
| 658 | |
| 659 | /*-------------------------------------------------------------------------*/ |
| 660 | |
| 661 | static int do_read(struct fsg_common *common) |
| 662 | { |
| 663 | struct fsg_lun *curlun = common->curlun; |
| 664 | u32 lba; |
| 665 | struct fsg_buffhd *bh; |
| 666 | int rc; |
| 667 | u32 amount_left; |
| 668 | loff_t file_offset, file_offset_tmp; |
| 669 | unsigned int amount; |
| 670 | ssize_t nread; |
| 671 | |
| 672 | /* |
| 673 | * Get the starting Logical Block Address and check that it's |
| 674 | * not too big. |
| 675 | */ |
| 676 | if (common->cmnd[0] == READ_6) |
| 677 | lba = get_unaligned_be24(&common->cmnd[1]); |
| 678 | else { |
| 679 | lba = get_unaligned_be32(&common->cmnd[2]); |
| 680 | |
| 681 | /* |
| 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. |
| 685 | */ |
| 686 | if ((common->cmnd[1] & ~0x18) != 0) { |
| 687 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 688 | return -EINVAL; |
| 689 | } |
| 690 | } |
| 691 | if (lba >= curlun->num_sectors) { |
| 692 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| 693 | return -EINVAL; |
| 694 | } |
| 695 | file_offset = ((loff_t) lba) << curlun->blkbits; |
| 696 | |
| 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 */ |
| 701 | |
| 702 | for (;;) { |
| 703 | /* |
| 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. |
| 708 | */ |
| 709 | amount = min(amount_left, FSG_BUFLEN); |
| 710 | amount = min((loff_t)amount, |
| 711 | curlun->file_length - file_offset); |
| 712 | |
| 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); |
| 717 | if (rc) |
| 718 | return rc; |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * If we were asked to read past the end of file, |
| 723 | * end with an empty buffer. |
| 724 | */ |
| 725 | if (amount == 0) { |
| 726 | curlun->sense_data = |
| 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; |
| 733 | break; |
| 734 | } |
| 735 | |
| 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)) |
| 744 | return -EINTR; |
| 745 | |
| 746 | if (nread < 0) { |
| 747 | LDBG(curlun, "error in file read: %d\n", (int)nread); |
| 748 | nread = 0; |
| 749 | } else if (nread < amount) { |
| 750 | LDBG(curlun, "partial file read: %d/%u\n", |
| 751 | (int)nread, amount); |
| 752 | nread = round_down(nread, curlun->blksize); |
| 753 | } |
| 754 | file_offset += nread; |
| 755 | amount_left -= nread; |
| 756 | common->residue -= nread; |
| 757 | |
| 758 | /* |
| 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. |
| 762 | */ |
| 763 | bh->inreq->length = nread; |
| 764 | bh->state = BUF_STATE_FULL; |
| 765 | |
| 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; |
| 772 | break; |
| 773 | } |
| 774 | |
| 775 | if (amount_left == 0) |
| 776 | break; /* No more left to read */ |
| 777 | |
| 778 | /* Send this buffer and go read some more */ |
| 779 | bh->inreq->zero = 0; |
| 780 | if (!start_in_transfer(common, bh)) |
| 781 | /* Don't know what to do if common->fsg is NULL */ |
| 782 | return -EIO; |
| 783 | common->next_buffhd_to_fill = bh->next; |
| 784 | } |
| 785 | |
| 786 | return -EIO; /* No default reply */ |
| 787 | } |
| 788 | |
| 789 | |
| 790 | /*-------------------------------------------------------------------------*/ |
| 791 | |
| 792 | static int do_write(struct fsg_common *common) |
| 793 | { |
| 794 | struct fsg_lun *curlun = common->curlun; |
| 795 | u32 lba; |
| 796 | struct fsg_buffhd *bh; |
| 797 | int get_some_more; |
| 798 | u32 amount_left_to_req, amount_left_to_write; |
| 799 | loff_t usb_offset, file_offset, file_offset_tmp; |
| 800 | unsigned int amount; |
| 801 | ssize_t nwritten; |
| 802 | int rc; |
| 803 | |
| 804 | if (curlun->ro) { |
| 805 | curlun->sense_data = SS_WRITE_PROTECTED; |
| 806 | return -EINVAL; |
| 807 | } |
| 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); |
| 811 | |
| 812 | /* |
| 813 | * Get the starting Logical Block Address and check that it's |
| 814 | * not too big |
| 815 | */ |
| 816 | if (common->cmnd[0] == WRITE_6) |
| 817 | lba = get_unaligned_be24(&common->cmnd[1]); |
| 818 | else { |
| 819 | lba = get_unaligned_be32(&common->cmnd[2]); |
| 820 | |
| 821 | /* |
| 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. |
| 826 | */ |
| 827 | if (common->cmnd[1] & ~0x18) { |
| 828 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 829 | return -EINVAL; |
| 830 | } |
| 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); |
| 835 | } |
| 836 | } |
| 837 | if (lba >= curlun->num_sectors) { |
| 838 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| 839 | return -EINVAL; |
| 840 | } |
| 841 | |
| 842 | /* Carry out the file writes */ |
| 843 | get_some_more = 1; |
| 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; |
| 847 | |
| 848 | while (amount_left_to_write > 0) { |
| 849 | |
| 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) { |
| 853 | |
| 854 | /* |
| 855 | * Figure out how much we want to get: |
| 856 | * Try to get the remaining amount, |
| 857 | * but not more than the buffer size. |
| 858 | */ |
| 859 | amount = min(amount_left_to_req, FSG_BUFLEN); |
| 860 | |
| 861 | /* Beyond the end of the backing file? */ |
| 862 | if (usb_offset >= curlun->file_length) { |
| 863 | get_some_more = 0; |
| 864 | curlun->sense_data = |
| 865 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| 866 | curlun->sense_data_info = |
| 867 | usb_offset >> curlun->blkbits; |
| 868 | curlun->info_valid = 1; |
| 869 | continue; |
| 870 | } |
| 871 | |
| 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) |
| 877 | get_some_more = 0; |
| 878 | |
| 879 | /* |
| 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. |
| 883 | */ |
| 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 */ |
| 887 | return -EIO; |
| 888 | common->next_buffhd_to_fill = bh->next; |
| 889 | continue; |
| 890 | } |
| 891 | |
| 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) { |
| 897 | smp_rmb(); |
| 898 | common->next_buffhd_to_drain = bh->next; |
| 899 | bh->state = BUF_STATE_EMPTY; |
| 900 | |
| 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; |
| 907 | break; |
| 908 | } |
| 909 | |
| 910 | amount = bh->outreq->actual; |
| 911 | if (curlun->file_length - file_offset < amount) { |
| 912 | LERROR(curlun, |
| 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; |
| 917 | } |
| 918 | |
| 919 | /* Don't accept excess data. The spec doesn't say |
| 920 | * what to do in this case. We'll ignore the error. |
| 921 | */ |
| 922 | amount = min(amount, bh->bulk_out_intended_length); |
| 923 | |
| 924 | /* Don't write a partial block */ |
| 925 | amount = round_down(amount, curlun->blksize); |
| 926 | if (amount == 0) |
| 927 | goto empty_write; |
| 928 | |
| 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! */ |
| 938 | |
| 939 | if (nwritten < 0) { |
| 940 | LDBG(curlun, "error in file write: %d\n", |
| 941 | (int)nwritten); |
| 942 | nwritten = 0; |
| 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); |
| 947 | } |
| 948 | file_offset += nwritten; |
| 949 | amount_left_to_write -= nwritten; |
| 950 | common->residue -= nwritten; |
| 951 | |
| 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; |
| 958 | break; |
| 959 | } |
| 960 | |
| 961 | empty_write: |
| 962 | /* Did the host decide to stop early? */ |
| 963 | if (bh->outreq->actual < bh->bulk_out_intended_length) { |
| 964 | common->short_packet_received = 1; |
| 965 | break; |
| 966 | } |
| 967 | continue; |
| 968 | } |
| 969 | |
| 970 | /* Wait for something to happen */ |
| 971 | rc = sleep_thread(common); |
| 972 | if (rc) |
| 973 | return rc; |
| 974 | } |
| 975 | |
| 976 | return -EIO; /* No default reply */ |
| 977 | } |
| 978 | |
| 979 | |
| 980 | /*-------------------------------------------------------------------------*/ |
| 981 | |
| 982 | static int do_synchronize_cache(struct fsg_common *common) |
| 983 | { |
| 984 | struct fsg_lun *curlun = common->curlun; |
| 985 | int rc; |
| 986 | |
| 987 | /* We ignore the requested LBA and write out all file's |
| 988 | * dirty data buffers. */ |
| 989 | rc = fsg_lun_fsync_sub(curlun); |
| 990 | if (rc) |
| 991 | curlun->sense_data = SS_WRITE_ERROR; |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | |
| 996 | /*-------------------------------------------------------------------------*/ |
| 997 | |
| 998 | static void invalidate_sub(struct fsg_lun *curlun) |
| 999 | { |
| 1000 | struct file *filp = curlun->filp; |
| 1001 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 1002 | unsigned long rc; |
| 1003 | |
| 1004 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); |
| 1005 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc); |
| 1006 | } |
| 1007 | |
| 1008 | static int do_verify(struct fsg_common *common) |
| 1009 | { |
| 1010 | struct fsg_lun *curlun = common->curlun; |
| 1011 | u32 lba; |
| 1012 | u32 verification_length; |
| 1013 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
| 1014 | loff_t file_offset, file_offset_tmp; |
| 1015 | u32 amount_left; |
| 1016 | unsigned int amount; |
| 1017 | ssize_t nread; |
| 1018 | |
| 1019 | /* |
| 1020 | * Get the starting Logical Block Address and check that it's |
| 1021 | * not too big. |
| 1022 | */ |
| 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; |
| 1026 | return -EINVAL; |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * We allow DPO (Disable Page Out = don't save data in the |
| 1031 | * cache) but we don't implement it. |
| 1032 | */ |
| 1033 | if (common->cmnd[1] & ~0x10) { |
| 1034 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1035 | return -EINVAL; |
| 1036 | } |
| 1037 | |
| 1038 | verification_length = get_unaligned_be16(&common->cmnd[7]); |
| 1039 | if (unlikely(verification_length == 0)) |
| 1040 | return -EIO; /* No default reply */ |
| 1041 | |
| 1042 | /* Prepare to carry out the file verify */ |
| 1043 | amount_left = verification_length << curlun->blkbits; |
| 1044 | file_offset = ((loff_t) lba) << curlun->blkbits; |
| 1045 | |
| 1046 | /* Write out all the dirty buffers before invalidating them */ |
| 1047 | fsg_lun_fsync_sub(curlun); |
| 1048 | if (signal_pending(current)) |
| 1049 | return -EINTR; |
| 1050 | |
| 1051 | invalidate_sub(curlun); |
| 1052 | if (signal_pending(current)) |
| 1053 | return -EINTR; |
| 1054 | |
| 1055 | /* Just try to read the requested blocks */ |
| 1056 | while (amount_left > 0) { |
| 1057 | /* |
| 1058 | * Figure out how much we need to read: |
| 1059 | * Try to read the remaining amount, but not more than |
| 1060 | * the buffer size. |
| 1061 | * And don't try to read past the end of the file. |
| 1062 | */ |
| 1063 | amount = min(amount_left, FSG_BUFLEN); |
| 1064 | amount = min((loff_t)amount, |
| 1065 | curlun->file_length - file_offset); |
| 1066 | if (amount == 0) { |
| 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; |
| 1072 | break; |
| 1073 | } |
| 1074 | |
| 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, |
| 1082 | (int) nread); |
| 1083 | if (signal_pending(current)) |
| 1084 | return -EINTR; |
| 1085 | |
| 1086 | if (nread < 0) { |
| 1087 | LDBG(curlun, "error in file verify: %d\n", (int)nread); |
| 1088 | nread = 0; |
| 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); |
| 1093 | } |
| 1094 | if (nread == 0) { |
| 1095 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR; |
| 1096 | curlun->sense_data_info = |
| 1097 | file_offset >> curlun->blkbits; |
| 1098 | curlun->info_valid = 1; |
| 1099 | break; |
| 1100 | } |
| 1101 | file_offset += nread; |
| 1102 | amount_left -= nread; |
| 1103 | } |
| 1104 | return 0; |
| 1105 | } |
| 1106 | |
| 1107 | |
| 1108 | /*-------------------------------------------------------------------------*/ |
| 1109 | |
| 1110 | static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1111 | { |
| 1112 | struct fsg_lun *curlun = common->curlun; |
| 1113 | u8 *buf = (u8 *) bh->buf; |
| 1114 | |
| 1115 | if (!curlun) { /* Unsupported LUNs are okay */ |
| 1116 | common->bad_lun_okay = 1; |
| 1117 | memset(buf, 0, 36); |
| 1118 | buf[0] = 0x7f; /* Unsupported, no device-type */ |
| 1119 | buf[4] = 31; /* Additional length */ |
| 1120 | return 36; |
| 1121 | } |
| 1122 | |
| 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 */ |
| 1129 | buf[6] = 0; |
| 1130 | buf[7] = 0; |
| 1131 | memcpy(buf + 8, common->inquiry_string, sizeof common->inquiry_string); |
| 1132 | return 36; |
| 1133 | } |
| 1134 | |
| 1135 | static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1136 | { |
| 1137 | struct fsg_lun *curlun = common->curlun; |
| 1138 | u8 *buf = (u8 *) bh->buf; |
| 1139 | u32 sd, sdinfo; |
| 1140 | int valid; |
| 1141 | |
| 1142 | /* |
| 1143 | * From the SCSI-2 spec., section 7.9 (Unit attention condition): |
| 1144 | * |
| 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. |
| 1154 | * |
| 1155 | * FSG normally uses option a); enable this code to use option b). |
| 1156 | */ |
| 1157 | #if 0 |
| 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; |
| 1161 | } |
| 1162 | #endif |
| 1163 | |
| 1164 | if (!curlun) { /* Unsupported LUNs are okay */ |
| 1165 | common->bad_lun_okay = 1; |
| 1166 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
| 1167 | sdinfo = 0; |
| 1168 | valid = 0; |
| 1169 | } else { |
| 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; |
| 1176 | } |
| 1177 | |
| 1178 | memset(buf, 0, 18); |
| 1179 | buf[0] = valid | 0x70; /* Valid, current error */ |
| 1180 | buf[2] = SK(sd); |
| 1181 | put_unaligned_be32(sdinfo, &buf[3]); /* Sense information */ |
| 1182 | buf[7] = 18 - 8; /* Additional sense length */ |
| 1183 | buf[12] = ASC(sd); |
| 1184 | buf[13] = ASCQ(sd); |
| 1185 | return 18; |
| 1186 | } |
| 1187 | |
| 1188 | static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1189 | { |
| 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; |
| 1194 | |
| 1195 | /* Check the PMI and LBA fields */ |
| 1196 | if (pmi > 1 || (pmi == 0 && lba != 0)) { |
| 1197 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1198 | return -EINVAL; |
| 1199 | } |
| 1200 | |
| 1201 | put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); |
| 1202 | /* Max logical block */ |
| 1203 | put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */ |
| 1204 | return 8; |
| 1205 | } |
| 1206 | |
| 1207 | static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1208 | { |
| 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; |
| 1213 | |
| 1214 | if (common->cmnd[1] & ~0x02) { /* Mask away MSF */ |
| 1215 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1216 | return -EINVAL; |
| 1217 | } |
| 1218 | if (lba >= curlun->num_sectors) { |
| 1219 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; |
| 1220 | return -EINVAL; |
| 1221 | } |
| 1222 | |
| 1223 | memset(buf, 0, 8); |
| 1224 | buf[0] = 0x01; /* 2048 bytes of user data, rest is EC */ |
| 1225 | store_cdrom_address(&buf[4], msf, lba); |
| 1226 | return 8; |
| 1227 | } |
| 1228 | |
| 1229 | static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1230 | { |
| 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; |
| 1235 | |
| 1236 | if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */ |
| 1237 | start_track > 1) { |
| 1238 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1239 | return -EINVAL; |
| 1240 | } |
| 1241 | |
| 1242 | memset(buf, 0, 20); |
| 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); |
| 1249 | |
| 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); |
| 1253 | return 20; |
| 1254 | } |
| 1255 | |
| 1256 | static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1257 | { |
| 1258 | struct fsg_lun *curlun = common->curlun; |
| 1259 | int mscmnd = common->cmnd[0]; |
| 1260 | u8 *buf = (u8 *) bh->buf; |
| 1261 | u8 *buf0 = buf; |
| 1262 | int pc, page_code; |
| 1263 | int changeable_values, all_pages; |
| 1264 | int valid_page = 0; |
| 1265 | int len, limit; |
| 1266 | |
| 1267 | if ((common->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ |
| 1268 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1269 | return -EINVAL; |
| 1270 | } |
| 1271 | pc = common->cmnd[2] >> 6; |
| 1272 | page_code = common->cmnd[2] & 0x3f; |
| 1273 | if (pc == 3) { |
| 1274 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; |
| 1275 | return -EINVAL; |
| 1276 | } |
| 1277 | changeable_values = (pc == 1); |
| 1278 | all_pages = (page_code == 0x3f); |
| 1279 | |
| 1280 | /* |
| 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. |
| 1285 | */ |
| 1286 | memset(buf, 0, 8); |
| 1287 | if (mscmnd == MODE_SENSE) { |
| 1288 | buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
| 1289 | buf += 4; |
| 1290 | limit = 255; |
| 1291 | } else { /* MODE_SENSE_10 */ |
| 1292 | buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ |
| 1293 | buf += 8; |
| 1294 | limit = 65535; /* Should really be FSG_BUFLEN */ |
| 1295 | } |
| 1296 | |
| 1297 | /* No block descriptors */ |
| 1298 | |
| 1299 | /* |
| 1300 | * The mode pages, in numerical order. The only page we support |
| 1301 | * is the Caching page. |
| 1302 | */ |
| 1303 | if (page_code == 0x08 || all_pages) { |
| 1304 | valid_page = 1; |
| 1305 | buf[0] = 0x08; /* Page code */ |
| 1306 | buf[1] = 10; /* Page length */ |
| 1307 | memset(buf+2, 0, 10); /* None of the fields are changeable */ |
| 1308 | |
| 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 */ |
| 1320 | } |
| 1321 | buf += 12; |
| 1322 | } |
| 1323 | |
| 1324 | /* |
| 1325 | * Check that a valid page was requested and the mode data length |
| 1326 | * isn't too long. |
| 1327 | */ |
| 1328 | len = buf - buf0; |
| 1329 | if (!valid_page || len > limit) { |
| 1330 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1331 | return -EINVAL; |
| 1332 | } |
| 1333 | |
| 1334 | /* Store the mode data length */ |
| 1335 | if (mscmnd == MODE_SENSE) |
| 1336 | buf0[0] = len - 1; |
| 1337 | else |
| 1338 | put_unaligned_be16(len - 2, buf0); |
| 1339 | return len; |
| 1340 | } |
| 1341 | |
| 1342 | static int do_start_stop(struct fsg_common *common) |
| 1343 | { |
| 1344 | struct fsg_lun *curlun = common->curlun; |
| 1345 | int loej, start; |
| 1346 | |
| 1347 | if (!curlun) { |
| 1348 | return -EINVAL; |
| 1349 | } else if (!curlun->removable) { |
| 1350 | curlun->sense_data = SS_INVALID_COMMAND; |
| 1351 | return -EINVAL; |
| 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; |
| 1355 | return -EINVAL; |
| 1356 | } |
| 1357 | |
| 1358 | loej = common->cmnd[4] & 0x02; |
| 1359 | start = common->cmnd[4] & 0x01; |
| 1360 | |
| 1361 | /* |
| 1362 | * Our emulation doesn't support mounting; the medium is |
| 1363 | * available for use as soon as it is loaded. |
| 1364 | */ |
| 1365 | if (start) { |
| 1366 | if (!fsg_lun_is_open(curlun)) { |
| 1367 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT; |
| 1368 | return -EINVAL; |
| 1369 | } |
| 1370 | return 0; |
| 1371 | } |
| 1372 | |
| 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; |
| 1377 | return -EINVAL; |
| 1378 | } |
| 1379 | |
| 1380 | if (!loej) |
| 1381 | return 0; |
| 1382 | |
| 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)) |
| 1388 | return r; |
| 1389 | else if (r) |
| 1390 | return 0; |
| 1391 | } |
| 1392 | |
| 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); |
| 1398 | |
| 1399 | return common->ops && common->ops->post_eject |
| 1400 | ? min(0, common->ops->post_eject(common, curlun, |
| 1401 | curlun - common->luns)) |
| 1402 | : 0; |
| 1403 | } |
| 1404 | |
| 1405 | static int do_prevent_allow(struct fsg_common *common) |
| 1406 | { |
| 1407 | struct fsg_lun *curlun = common->curlun; |
| 1408 | int prevent; |
| 1409 | |
| 1410 | if (!common->curlun) { |
| 1411 | return -EINVAL; |
| 1412 | } else if (!common->curlun->removable) { |
| 1413 | common->curlun->sense_data = SS_INVALID_COMMAND; |
| 1414 | return -EINVAL; |
| 1415 | } |
| 1416 | |
| 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; |
| 1420 | return -EINVAL; |
| 1421 | } |
| 1422 | |
| 1423 | if (curlun->prevent_medium_removal && !prevent) |
| 1424 | fsg_lun_fsync_sub(curlun); |
| 1425 | curlun->prevent_medium_removal = prevent; |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
| 1429 | static int do_read_format_capacities(struct fsg_common *common, |
| 1430 | struct fsg_buffhd *bh) |
| 1431 | { |
| 1432 | struct fsg_lun *curlun = common->curlun; |
| 1433 | u8 *buf = (u8 *) bh->buf; |
| 1434 | |
| 1435 | buf[0] = buf[1] = buf[2] = 0; |
| 1436 | buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ |
| 1437 | buf += 4; |
| 1438 | |
| 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 */ |
| 1443 | return 12; |
| 1444 | } |
| 1445 | |
| 1446 | static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh) |
| 1447 | { |
| 1448 | struct fsg_lun *curlun = common->curlun; |
| 1449 | |
| 1450 | /* We don't support MODE SELECT */ |
| 1451 | if (curlun) |
| 1452 | curlun->sense_data = SS_INVALID_COMMAND; |
| 1453 | return -EINVAL; |
| 1454 | } |
| 1455 | |
| 1456 | |
| 1457 | /*-------------------------------------------------------------------------*/ |
| 1458 | |
| 1459 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg) |
| 1460 | { |
| 1461 | int rc; |
| 1462 | |
| 1463 | rc = fsg_set_halt(fsg, fsg->bulk_in); |
| 1464 | if (rc == -EAGAIN) |
| 1465 | VDBG(fsg, "delayed bulk-in endpoint halt\n"); |
| 1466 | while (rc != 0) { |
| 1467 | if (rc != -EAGAIN) { |
| 1468 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc); |
| 1469 | rc = 0; |
| 1470 | break; |
| 1471 | } |
| 1472 | |
| 1473 | /* Wait for a short time and then try again */ |
| 1474 | if (msleep_interruptible(100) != 0) |
| 1475 | return -EINTR; |
| 1476 | rc = usb_ep_set_halt(fsg->bulk_in); |
| 1477 | } |
| 1478 | return rc; |
| 1479 | } |
| 1480 | |
| 1481 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg) |
| 1482 | { |
| 1483 | int rc; |
| 1484 | |
| 1485 | DBG(fsg, "bulk-in set wedge\n"); |
| 1486 | rc = usb_ep_set_wedge(fsg->bulk_in); |
| 1487 | if (rc == -EAGAIN) |
| 1488 | VDBG(fsg, "delayed bulk-in endpoint wedge\n"); |
| 1489 | while (rc != 0) { |
| 1490 | if (rc != -EAGAIN) { |
| 1491 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc); |
| 1492 | rc = 0; |
| 1493 | break; |
| 1494 | } |
| 1495 | |
| 1496 | /* Wait for a short time and then try again */ |
| 1497 | if (msleep_interruptible(100) != 0) |
| 1498 | return -EINTR; |
| 1499 | rc = usb_ep_set_wedge(fsg->bulk_in); |
| 1500 | } |
| 1501 | return rc; |
| 1502 | } |
| 1503 | |
| 1504 | static int throw_away_data(struct fsg_common *common) |
| 1505 | { |
| 1506 | struct fsg_buffhd *bh; |
| 1507 | u32 amount; |
| 1508 | int rc; |
| 1509 | |
| 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) { |
| 1513 | |
| 1514 | /* Throw away the data in a filled buffer */ |
| 1515 | if (bh->state == BUF_STATE_FULL) { |
| 1516 | smp_rmb(); |
| 1517 | bh->state = BUF_STATE_EMPTY; |
| 1518 | common->next_buffhd_to_drain = bh->next; |
| 1519 | |
| 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); |
| 1525 | return -EINTR; |
| 1526 | } |
| 1527 | continue; |
| 1528 | } |
| 1529 | |
| 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); |
| 1535 | |
| 1536 | /* |
| 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. |
| 1540 | */ |
| 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 */ |
| 1544 | return -EIO; |
| 1545 | common->next_buffhd_to_fill = bh->next; |
| 1546 | common->usb_amount_left -= amount; |
| 1547 | continue; |
| 1548 | } |
| 1549 | |
| 1550 | /* Otherwise wait for something to happen */ |
| 1551 | rc = sleep_thread(common); |
| 1552 | if (rc) |
| 1553 | return rc; |
| 1554 | } |
| 1555 | return 0; |
| 1556 | } |
| 1557 | |
| 1558 | static int finish_reply(struct fsg_common *common) |
| 1559 | { |
| 1560 | struct fsg_buffhd *bh = common->next_buffhd_to_fill; |
| 1561 | int rc = 0; |
| 1562 | |
| 1563 | switch (common->data_dir) { |
| 1564 | case DATA_DIR_NONE: |
| 1565 | break; /* Nothing to send */ |
| 1566 | |
| 1567 | /* |
| 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. |
| 1572 | */ |
| 1573 | case DATA_DIR_UNKNOWN: |
| 1574 | if (!common->can_stall) { |
| 1575 | /* Nothing */ |
| 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); |
| 1579 | } else { |
| 1580 | /* Don't know what to do if common->fsg is NULL */ |
| 1581 | rc = -EIO; |
| 1582 | } |
| 1583 | break; |
| 1584 | |
| 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 */ |
| 1589 | |
| 1590 | /* Don't know what to do if common->fsg is NULL */ |
| 1591 | } else if (!fsg_is_set(common)) { |
| 1592 | rc = -EIO; |
| 1593 | |
| 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)) |
| 1598 | return -EIO; |
| 1599 | common->next_buffhd_to_fill = bh->next; |
| 1600 | |
| 1601 | /* |
| 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.) |
| 1607 | */ |
| 1608 | } else { |
| 1609 | bh->inreq->zero = 1; |
| 1610 | if (!start_in_transfer(common, bh)) |
| 1611 | rc = -EIO; |
| 1612 | common->next_buffhd_to_fill = bh->next; |
| 1613 | if (common->can_stall) |
| 1614 | rc = halt_bulk_in_endpoint(common->fsg); |
| 1615 | } |
| 1616 | break; |
| 1617 | |
| 1618 | /* |
| 1619 | * We have processed all we want from the data the host has sent. |
| 1620 | * There may still be outstanding bulk-out requests. |
| 1621 | */ |
| 1622 | case DATA_DIR_FROM_HOST: |
| 1623 | if (common->residue == 0) { |
| 1624 | /* Nothing to receive */ |
| 1625 | |
| 1626 | /* Did the host stop sending unexpectedly early? */ |
| 1627 | } else if (common->short_packet_received) { |
| 1628 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT); |
| 1629 | rc = -EINTR; |
| 1630 | |
| 1631 | /* |
| 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. |
| 1638 | */ |
| 1639 | #if 0 |
| 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); |
| 1645 | rc = -EINTR; |
| 1646 | #endif |
| 1647 | |
| 1648 | /* |
| 1649 | * We can't stall. Read in the excess data and throw it |
| 1650 | * all away. |
| 1651 | */ |
| 1652 | } else { |
| 1653 | rc = throw_away_data(common); |
| 1654 | } |
| 1655 | break; |
| 1656 | } |
| 1657 | return rc; |
| 1658 | } |
| 1659 | |
| 1660 | static int send_status(struct fsg_common *common) |
| 1661 | { |
| 1662 | struct fsg_lun *curlun = common->curlun; |
| 1663 | struct fsg_buffhd *bh; |
| 1664 | struct bulk_cs_wrap *csw; |
| 1665 | int rc; |
| 1666 | u8 status = US_BULK_STAT_OK; |
| 1667 | u32 sd, sdinfo = 0; |
| 1668 | |
| 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); |
| 1673 | if (rc) |
| 1674 | return rc; |
| 1675 | } |
| 1676 | |
| 1677 | if (curlun) { |
| 1678 | sd = curlun->sense_data; |
| 1679 | sdinfo = curlun->sense_data_info; |
| 1680 | } else if (common->bad_lun_okay) |
| 1681 | sd = SS_NO_SENSE; |
| 1682 | else |
| 1683 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; |
| 1684 | |
| 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;" |
| 1693 | " info x%x\n", |
| 1694 | SK(sd), ASC(sd), ASCQ(sd), sdinfo); |
| 1695 | } |
| 1696 | |
| 1697 | /* Store and send the Bulk-only CSW */ |
| 1698 | csw = (void *)bh->buf; |
| 1699 | |
| 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; |
| 1704 | |
| 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 */ |
| 1709 | return -EIO; |
| 1710 | |
| 1711 | common->next_buffhd_to_fill = bh->next; |
| 1712 | return 0; |
| 1713 | } |
| 1714 | |
| 1715 | |
| 1716 | /*-------------------------------------------------------------------------*/ |
| 1717 | |
| 1718 | /* |
| 1719 | * Check whether the command is properly formed and whether its data size |
| 1720 | * and direction agree with the values we already have. |
| 1721 | */ |
| 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) |
| 1725 | { |
| 1726 | int i; |
| 1727 | int lun = common->cmnd[1] >> 5; |
| 1728 | static const char dirletter[4] = {'u', 'o', 'i', 'n'}; |
| 1729 | char hdlen[20]; |
| 1730 | struct fsg_lun *curlun; |
| 1731 | |
| 1732 | hdlen[0] = 0; |
| 1733 | if (common->data_dir != DATA_DIR_UNKNOWN) |
| 1734 | sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir], |
| 1735 | common->data_size); |
| 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); |
| 1739 | |
| 1740 | /* |
| 1741 | * We can't reply at all until we know the correct data direction |
| 1742 | * and size. |
| 1743 | */ |
| 1744 | if (common->data_size_from_cmnd == 0) |
| 1745 | data_dir = DATA_DIR_NONE; |
| 1746 | if (common->data_size < common->data_size_from_cmnd) { |
| 1747 | /* |
| 1748 | * Host data size < Device data size is a phase error. |
| 1749 | * Carry out the command, but only transfer as much as |
| 1750 | * we are allowed. |
| 1751 | */ |
| 1752 | common->data_size_from_cmnd = common->data_size; |
| 1753 | common->phase_error = 1; |
| 1754 | } |
| 1755 | common->residue = common->data_size; |
| 1756 | common->usb_amount_left = common->data_size; |
| 1757 | |
| 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; |
| 1761 | return -EINVAL; |
| 1762 | } |
| 1763 | |
| 1764 | /* Verify the length of the command itself */ |
| 1765 | if (cmnd_size != common->cmnd_size) { |
| 1766 | |
| 1767 | /* |
| 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 |
| 1778 | * be 6 as well. |
| 1779 | */ |
| 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; |
| 1785 | } else { |
| 1786 | common->phase_error = 1; |
| 1787 | return -EINVAL; |
| 1788 | } |
| 1789 | } |
| 1790 | |
| 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", |
| 1794 | common->lun, lun); |
| 1795 | |
| 1796 | /* Check the LUN */ |
| 1797 | curlun = common->curlun; |
| 1798 | if (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; |
| 1803 | } |
| 1804 | } else { |
| 1805 | common->bad_lun_okay = 0; |
| 1806 | |
| 1807 | /* |
| 1808 | * INQUIRY and REQUEST SENSE commands are explicitly allowed |
| 1809 | * to use unsupported LUNs; all others may not. |
| 1810 | */ |
| 1811 | if (common->cmnd[0] != INQUIRY && |
| 1812 | common->cmnd[0] != REQUEST_SENSE) { |
| 1813 | DBG(common, "unsupported LUN %d\n", common->lun); |
| 1814 | return -EINVAL; |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | /* |
| 1819 | * If a unit attention condition exists, only INQUIRY and |
| 1820 | * REQUEST SENSE commands are allowed; anything else must fail. |
| 1821 | */ |
| 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; |
| 1827 | return -EINVAL; |
| 1828 | } |
| 1829 | |
| 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))) { |
| 1834 | if (curlun) |
| 1835 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB; |
| 1836 | return -EINVAL; |
| 1837 | } |
| 1838 | } |
| 1839 | |
| 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; |
| 1844 | return -EINVAL; |
| 1845 | } |
| 1846 | |
| 1847 | return 0; |
| 1848 | } |
| 1849 | |
| 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) |
| 1854 | { |
| 1855 | if (common->curlun) |
| 1856 | common->data_size_from_cmnd <<= common->curlun->blkbits; |
| 1857 | return check_command(common, cmnd_size, data_dir, |
| 1858 | mask, needs_medium, name); |
| 1859 | } |
| 1860 | |
| 1861 | static int do_scsi_command(struct fsg_common *common) |
| 1862 | { |
| 1863 | struct fsg_buffhd *bh; |
| 1864 | int rc; |
| 1865 | int reply = -EINVAL; |
| 1866 | int i; |
| 1867 | static char unknown[16]; |
| 1868 | |
| 1869 | dump_cdb(common); |
| 1870 | |
| 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); |
| 1876 | if (rc) |
| 1877 | return rc; |
| 1878 | } |
| 1879 | common->phase_error = 0; |
| 1880 | common->short_packet_received = 0; |
| 1881 | |
| 1882 | down_read(&common->filesem); /* We're using the backing file */ |
| 1883 | switch (common->cmnd[0]) { |
| 1884 | |
| 1885 | case INQUIRY: |
| 1886 | common->data_size_from_cmnd = common->cmnd[4]; |
| 1887 | reply = check_command(common, 6, DATA_DIR_TO_HOST, |
| 1888 | (1<<4), 0, |
| 1889 | "INQUIRY"); |
| 1890 | if (reply == 0) |
| 1891 | reply = do_inquiry(common, bh); |
| 1892 | break; |
| 1893 | |
| 1894 | case MODE_SELECT: |
| 1895 | common->data_size_from_cmnd = common->cmnd[4]; |
| 1896 | reply = check_command(common, 6, DATA_DIR_FROM_HOST, |
| 1897 | (1<<1) | (1<<4), 0, |
| 1898 | "MODE SELECT(6)"); |
| 1899 | if (reply == 0) |
| 1900 | reply = do_mode_select(common, bh); |
| 1901 | break; |
| 1902 | |
| 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, |
| 1907 | (1<<1) | (3<<7), 0, |
| 1908 | "MODE SELECT(10)"); |
| 1909 | if (reply == 0) |
| 1910 | reply = do_mode_select(common, bh); |
| 1911 | break; |
| 1912 | |
| 1913 | case MODE_SENSE: |
| 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, |
| 1917 | "MODE SENSE(6)"); |
| 1918 | if (reply == 0) |
| 1919 | reply = do_mode_sense(common, bh); |
| 1920 | break; |
| 1921 | |
| 1922 | case MODE_SENSE_10: |
| 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, |
| 1927 | "MODE SENSE(10)"); |
| 1928 | if (reply == 0) |
| 1929 | reply = do_mode_sense(common, bh); |
| 1930 | break; |
| 1931 | |
| 1932 | case ALLOW_MEDIUM_REMOVAL: |
| 1933 | common->data_size_from_cmnd = 0; |
| 1934 | reply = check_command(common, 6, DATA_DIR_NONE, |
| 1935 | (1<<4), 0, |
| 1936 | "PREVENT-ALLOW MEDIUM REMOVAL"); |
| 1937 | if (reply == 0) |
| 1938 | reply = do_prevent_allow(common); |
| 1939 | break; |
| 1940 | |
| 1941 | case READ_6: |
| 1942 | i = common->cmnd[4]; |
| 1943 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
| 1944 | reply = check_command_size_in_blocks(common, 6, |
| 1945 | DATA_DIR_TO_HOST, |
| 1946 | (7<<1) | (1<<4), 1, |
| 1947 | "READ(6)"); |
| 1948 | if (reply == 0) |
| 1949 | reply = do_read(common); |
| 1950 | break; |
| 1951 | |
| 1952 | case READ_10: |
| 1953 | common->data_size_from_cmnd = |
| 1954 | get_unaligned_be16(&common->cmnd[7]); |
| 1955 | reply = check_command_size_in_blocks(common, 10, |
| 1956 | DATA_DIR_TO_HOST, |
| 1957 | (1<<1) | (0xf<<2) | (3<<7), 1, |
| 1958 | "READ(10)"); |
| 1959 | if (reply == 0) |
| 1960 | reply = do_read(common); |
| 1961 | break; |
| 1962 | |
| 1963 | case READ_12: |
| 1964 | common->data_size_from_cmnd = |
| 1965 | get_unaligned_be32(&common->cmnd[6]); |
| 1966 | reply = check_command_size_in_blocks(common, 12, |
| 1967 | DATA_DIR_TO_HOST, |
| 1968 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
| 1969 | "READ(12)"); |
| 1970 | if (reply == 0) |
| 1971 | reply = do_read(common); |
| 1972 | break; |
| 1973 | |
| 1974 | case READ_CAPACITY: |
| 1975 | common->data_size_from_cmnd = 8; |
| 1976 | reply = check_command(common, 10, DATA_DIR_TO_HOST, |
| 1977 | (0xf<<2) | (1<<8), 1, |
| 1978 | "READ CAPACITY"); |
| 1979 | if (reply == 0) |
| 1980 | reply = do_read_capacity(common, bh); |
| 1981 | break; |
| 1982 | |
| 1983 | case READ_HEADER: |
| 1984 | if (!common->curlun || !common->curlun->cdrom) |
| 1985 | goto unknown_cmnd; |
| 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, |
| 1990 | "READ HEADER"); |
| 1991 | if (reply == 0) |
| 1992 | reply = do_read_header(common, bh); |
| 1993 | break; |
| 1994 | |
| 1995 | case READ_TOC: |
| 1996 | if (!common->curlun || !common->curlun->cdrom) |
| 1997 | goto unknown_cmnd; |
| 1998 | common->data_size_from_cmnd = |
| 1999 | get_unaligned_be16(&common->cmnd[7]); |
| 2000 | reply = check_command(common, 10, DATA_DIR_TO_HOST, |
| 2001 | (7<<6) | (1<<1), 1, |
| 2002 | "READ TOC"); |
| 2003 | if (reply == 0) |
| 2004 | reply = do_read_toc(common, bh); |
| 2005 | break; |
| 2006 | |
| 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, |
| 2011 | (3<<7), 1, |
| 2012 | "READ FORMAT CAPACITIES"); |
| 2013 | if (reply == 0) |
| 2014 | reply = do_read_format_capacities(common, bh); |
| 2015 | break; |
| 2016 | |
| 2017 | case REQUEST_SENSE: |
| 2018 | common->data_size_from_cmnd = common->cmnd[4]; |
| 2019 | reply = check_command(common, 6, DATA_DIR_TO_HOST, |
| 2020 | (1<<4), 0, |
| 2021 | "REQUEST SENSE"); |
| 2022 | if (reply == 0) |
| 2023 | reply = do_request_sense(common, bh); |
| 2024 | break; |
| 2025 | |
| 2026 | case START_STOP: |
| 2027 | common->data_size_from_cmnd = 0; |
| 2028 | reply = check_command(common, 6, DATA_DIR_NONE, |
| 2029 | (1<<1) | (1<<4), 0, |
| 2030 | "START-STOP UNIT"); |
| 2031 | if (reply == 0) |
| 2032 | reply = do_start_stop(common); |
| 2033 | break; |
| 2034 | |
| 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"); |
| 2040 | if (reply == 0) |
| 2041 | reply = do_synchronize_cache(common); |
| 2042 | break; |
| 2043 | |
| 2044 | case TEST_UNIT_READY: |
| 2045 | common->data_size_from_cmnd = 0; |
| 2046 | reply = check_command(common, 6, DATA_DIR_NONE, |
| 2047 | 0, 1, |
| 2048 | "TEST UNIT READY"); |
| 2049 | break; |
| 2050 | |
| 2051 | /* |
| 2052 | * Although optional, this command is used by MS-Windows. We |
| 2053 | * support a minimal version: BytChk must be 0. |
| 2054 | */ |
| 2055 | case VERIFY: |
| 2056 | common->data_size_from_cmnd = 0; |
| 2057 | reply = check_command(common, 10, DATA_DIR_NONE, |
| 2058 | (1<<1) | (0xf<<2) | (3<<7), 1, |
| 2059 | "VERIFY"); |
| 2060 | if (reply == 0) |
| 2061 | reply = do_verify(common); |
| 2062 | break; |
| 2063 | |
| 2064 | case WRITE_6: |
| 2065 | i = common->cmnd[4]; |
| 2066 | common->data_size_from_cmnd = (i == 0) ? 256 : i; |
| 2067 | reply = check_command_size_in_blocks(common, 6, |
| 2068 | DATA_DIR_FROM_HOST, |
| 2069 | (7<<1) | (1<<4), 1, |
| 2070 | "WRITE(6)"); |
| 2071 | if (reply == 0) |
| 2072 | reply = do_write(common); |
| 2073 | break; |
| 2074 | |
| 2075 | case WRITE_10: |
| 2076 | common->data_size_from_cmnd = |
| 2077 | get_unaligned_be16(&common->cmnd[7]); |
| 2078 | reply = check_command_size_in_blocks(common, 10, |
| 2079 | DATA_DIR_FROM_HOST, |
| 2080 | (1<<1) | (0xf<<2) | (3<<7), 1, |
| 2081 | "WRITE(10)"); |
| 2082 | if (reply == 0) |
| 2083 | reply = do_write(common); |
| 2084 | break; |
| 2085 | |
| 2086 | case WRITE_12: |
| 2087 | common->data_size_from_cmnd = |
| 2088 | get_unaligned_be32(&common->cmnd[6]); |
| 2089 | reply = check_command_size_in_blocks(common, 12, |
| 2090 | DATA_DIR_FROM_HOST, |
| 2091 | (1<<1) | (0xf<<2) | (0xf<<6), 1, |
| 2092 | "WRITE(12)"); |
| 2093 | if (reply == 0) |
| 2094 | reply = do_write(common); |
| 2095 | break; |
| 2096 | |
| 2097 | /* |
| 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 |
| 2101 | * of Posix locks. |
| 2102 | */ |
| 2103 | case FORMAT_UNIT: |
| 2104 | case RELEASE: |
| 2105 | case RESERVE: |
| 2106 | case SEND_DIAGNOSTIC: |
| 2107 | /* Fall through */ |
| 2108 | |
| 2109 | default: |
| 2110 | unknown_cmnd: |
| 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); |
| 2115 | if (reply == 0) { |
| 2116 | common->curlun->sense_data = SS_INVALID_COMMAND; |
| 2117 | reply = -EINVAL; |
| 2118 | } |
| 2119 | break; |
| 2120 | } |
| 2121 | up_read(&common->filesem); |
| 2122 | |
| 2123 | if (reply == -EINTR || signal_pending(current)) |
| 2124 | return -EINTR; |
| 2125 | |
| 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 */ |
| 2135 | |
| 2136 | return 0; |
| 2137 | } |
| 2138 | |
| 2139 | |
| 2140 | /*-------------------------------------------------------------------------*/ |
| 2141 | |
| 2142 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) |
| 2143 | { |
| 2144 | struct usb_request *req = bh->outreq; |
| 2145 | struct bulk_cb_wrap *cbw = req->buf; |
| 2146 | struct fsg_common *common = fsg->common; |
| 2147 | |
| 2148 | /* Was this a real packet? Should it be ignored? */ |
| 2149 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags)) |
| 2150 | return -EINVAL; |
| 2151 | |
| 2152 | /* Is the CBW valid? */ |
| 2153 | if (req->actual != US_BULK_CB_WRAP_LEN || |
| 2154 | cbw->Signature != cpu_to_le32( |
| 2155 | US_BULK_CB_SIGN)) { |
| 2156 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n", |
| 2157 | req->actual, |
| 2158 | le32_to_cpu(cbw->Signature)); |
| 2159 | |
| 2160 | /* |
| 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. |
| 2166 | * |
| 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. |
| 2170 | */ |
| 2171 | wedge_bulk_in_endpoint(fsg); |
| 2172 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags); |
| 2173 | return -EINVAL; |
| 2174 | } |
| 2175 | |
| 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, " |
| 2180 | "cmdlen %u\n", |
| 2181 | cbw->Lun, cbw->Flags, cbw->Length); |
| 2182 | |
| 2183 | /* |
| 2184 | * We can do anything we want here, so let's stall the |
| 2185 | * bulk pipes if we are allowed to. |
| 2186 | */ |
| 2187 | if (common->can_stall) { |
| 2188 | fsg_set_halt(fsg, fsg->bulk_out); |
| 2189 | halt_bulk_in_endpoint(fsg); |
| 2190 | } |
| 2191 | return -EINVAL; |
| 2192 | } |
| 2193 | |
| 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; |
| 2199 | else |
| 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]; |
| 2207 | else |
| 2208 | common->curlun = NULL; |
| 2209 | common->tag = cbw->Tag; |
| 2210 | return 0; |
| 2211 | } |
| 2212 | |
| 2213 | static int get_next_command(struct fsg_common *common) |
| 2214 | { |
| 2215 | struct fsg_buffhd *bh; |
| 2216 | int rc = 0; |
| 2217 | |
| 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); |
| 2222 | if (rc) |
| 2223 | return rc; |
| 2224 | } |
| 2225 | |
| 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 */ |
| 2230 | return -EIO; |
| 2231 | |
| 2232 | /* |
| 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. |
| 2236 | */ |
| 2237 | |
| 2238 | /* Wait for the CBW to arrive */ |
| 2239 | while (bh->state != BUF_STATE_FULL) { |
| 2240 | rc = sleep_thread(common); |
| 2241 | if (rc) |
| 2242 | return rc; |
| 2243 | } |
| 2244 | smp_rmb(); |
| 2245 | rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO; |
| 2246 | bh->state = BUF_STATE_EMPTY; |
| 2247 | |
| 2248 | return rc; |
| 2249 | } |
| 2250 | |
| 2251 | |
| 2252 | /*-------------------------------------------------------------------------*/ |
| 2253 | |
| 2254 | static int alloc_request(struct fsg_common *common, struct usb_ep *ep, |
| 2255 | struct usb_request **preq) |
| 2256 | { |
| 2257 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); |
| 2258 | if (*preq) |
| 2259 | return 0; |
| 2260 | ERROR(common, "can't allocate request for %s\n", ep->name); |
| 2261 | return -ENOMEM; |
| 2262 | } |
| 2263 | |
| 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) |
| 2266 | { |
| 2267 | struct fsg_dev *fsg; |
| 2268 | int i, rc = 0; |
| 2269 | |
| 2270 | if (common->running) |
| 2271 | DBG(common, "reset interface\n"); |
| 2272 | |
| 2273 | reset: |
| 2274 | /* Deallocate the requests */ |
| 2275 | if (common->fsg) { |
| 2276 | fsg = common->fsg; |
| 2277 | |
| 2278 | for (i = 0; i < fsg_num_buffers; ++i) { |
| 2279 | struct fsg_buffhd *bh = &common->buffhds[i]; |
| 2280 | |
| 2281 | if (bh->inreq) { |
| 2282 | usb_ep_free_request(fsg->bulk_in, bh->inreq); |
| 2283 | bh->inreq = NULL; |
| 2284 | } |
| 2285 | if (bh->outreq) { |
| 2286 | usb_ep_free_request(fsg->bulk_out, bh->outreq); |
| 2287 | bh->outreq = NULL; |
| 2288 | } |
| 2289 | } |
| 2290 | |
| 2291 | /* Disable the endpoints */ |
| 2292 | if (fsg->bulk_in_enabled) { |
| 2293 | usb_ep_disable(fsg->bulk_in); |
| 2294 | fsg->bulk_in_enabled = 0; |
| 2295 | } |
| 2296 | if (fsg->bulk_out_enabled) { |
| 2297 | usb_ep_disable(fsg->bulk_out); |
| 2298 | fsg->bulk_out_enabled = 0; |
| 2299 | } |
| 2300 | |
| 2301 | common->fsg = NULL; |
| 2302 | wake_up(&common->fsg_wait); |
| 2303 | } |
| 2304 | |
| 2305 | common->running = 0; |
| 2306 | if (!new_fsg || rc) |
| 2307 | return rc; |
| 2308 | |
| 2309 | common->fsg = new_fsg; |
| 2310 | fsg = common->fsg; |
| 2311 | |
| 2312 | /* Enable the endpoints */ |
| 2313 | rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in); |
| 2314 | if (rc) |
| 2315 | goto reset; |
| 2316 | rc = usb_ep_enable(fsg->bulk_in); |
| 2317 | if (rc) |
| 2318 | goto reset; |
| 2319 | fsg->bulk_in->driver_data = common; |
| 2320 | fsg->bulk_in_enabled = 1; |
| 2321 | |
| 2322 | rc = config_ep_by_speed(common->gadget, &(fsg->function), |
| 2323 | fsg->bulk_out); |
| 2324 | if (rc) |
| 2325 | goto reset; |
| 2326 | rc = usb_ep_enable(fsg->bulk_out); |
| 2327 | if (rc) |
| 2328 | goto reset; |
| 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); |
| 2333 | |
| 2334 | /* Allocate the requests */ |
| 2335 | for (i = 0; i < fsg_num_buffers; ++i) { |
| 2336 | struct fsg_buffhd *bh = &common->buffhds[i]; |
| 2337 | |
| 2338 | rc = alloc_request(common, fsg->bulk_in, &bh->inreq); |
| 2339 | if (rc) |
| 2340 | goto reset; |
| 2341 | rc = alloc_request(common, fsg->bulk_out, &bh->outreq); |
| 2342 | if (rc) |
| 2343 | goto reset; |
| 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; |
| 2348 | } |
| 2349 | |
| 2350 | common->running = 1; |
| 2351 | for (i = 0; i < common->nluns; ++i) |
| 2352 | common->luns[i].unit_attention_data = SS_RESET_OCCURRED; |
| 2353 | return rc; |
| 2354 | } |
| 2355 | |
| 2356 | |
| 2357 | /****************************** ALT CONFIGS ******************************/ |
| 2358 | |
| 2359 | static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
| 2360 | { |
| 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; |
| 2365 | } |
| 2366 | |
| 2367 | static void fsg_disable(struct usb_function *f) |
| 2368 | { |
| 2369 | struct fsg_dev *fsg = fsg_from_func(f); |
| 2370 | fsg->common->new_fsg = NULL; |
| 2371 | raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE); |
| 2372 | } |
| 2373 | |
| 2374 | |
| 2375 | /*-------------------------------------------------------------------------*/ |
| 2376 | |
| 2377 | static void handle_exception(struct fsg_common *common) |
| 2378 | { |
| 2379 | siginfo_t info; |
| 2380 | int i; |
| 2381 | struct fsg_buffhd *bh; |
| 2382 | enum fsg_state old_state; |
| 2383 | struct fsg_lun *curlun; |
| 2384 | unsigned int exception_req_tag; |
| 2385 | |
| 2386 | /* |
| 2387 | * Clear the existing signals. Anything but SIGUSR1 is converted |
| 2388 | * into a high-priority EXIT exception. |
| 2389 | */ |
| 2390 | for (;;) { |
| 2391 | int sig = |
| 2392 | dequeue_signal_lock(current, ¤t->blocked, &info); |
| 2393 | if (!sig) |
| 2394 | break; |
| 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); |
| 2399 | } |
| 2400 | } |
| 2401 | |
| 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]; |
| 2406 | if (bh->inreq_busy) |
| 2407 | usb_ep_dequeue(common->fsg->bulk_in, bh->inreq); |
| 2408 | if (bh->outreq_busy) |
| 2409 | usb_ep_dequeue(common->fsg->bulk_out, |
| 2410 | bh->outreq); |
| 2411 | } |
| 2412 | |
| 2413 | /* Wait until everything is idle */ |
| 2414 | for (;;) { |
| 2415 | int num_active = 0; |
| 2416 | for (i = 0; i < fsg_num_buffers; ++i) { |
| 2417 | bh = &common->buffhds[i]; |
| 2418 | num_active += bh->inreq_busy + bh->outreq_busy; |
| 2419 | } |
| 2420 | if (num_active == 0) |
| 2421 | break; |
| 2422 | if (sleep_thread(common)) |
| 2423 | return; |
| 2424 | } |
| 2425 | |
| 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); |
| 2431 | } |
| 2432 | |
| 2433 | /* |
| 2434 | * Reset the I/O buffer states and pointers, the SCSI |
| 2435 | * state, and the exception. Then invoke the handler. |
| 2436 | */ |
| 2437 | spin_lock_irq(&common->lock); |
| 2438 | |
| 2439 | for (i = 0; i < fsg_num_buffers; ++i) { |
| 2440 | bh = &common->buffhds[i]; |
| 2441 | bh->state = BUF_STATE_EMPTY; |
| 2442 | } |
| 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; |
| 2447 | |
| 2448 | if (old_state == FSG_STATE_ABORT_BULK_OUT) |
| 2449 | common->state = FSG_STATE_STATUS_PHASE; |
| 2450 | else { |
| 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; |
| 2458 | } |
| 2459 | common->state = FSG_STATE_IDLE; |
| 2460 | } |
| 2461 | spin_unlock_irq(&common->lock); |
| 2462 | |
| 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); |
| 2471 | break; |
| 2472 | |
| 2473 | case FSG_STATE_RESET: |
| 2474 | /* |
| 2475 | * In case we were forced against our will to halt a |
| 2476 | * bulk endpoint, clear the halt now. (The SuperH UDC |
| 2477 | * requires this.) |
| 2478 | */ |
| 2479 | if (!fsg_is_set(common)) |
| 2480 | break; |
| 2481 | if (test_and_clear_bit(IGNORE_BULK_OUT, |
| 2482 | &common->fsg->atomic_bitflags)) |
| 2483 | usb_ep_clear_halt(common->fsg->bulk_in); |
| 2484 | |
| 2485 | if (common->ep0_req_tag == exception_req_tag) |
| 2486 | ep0_queue(common); /* Complete the status stage */ |
| 2487 | |
| 2488 | /* |
| 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. |
| 2492 | */ |
| 2493 | /* for (i = 0; i < common->nluns; ++i) */ |
| 2494 | /* common->luns[i].unit_attention_data = */ |
| 2495 | /* SS_RESET_OCCURRED; */ |
| 2496 | break; |
| 2497 | |
| 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); |
| 2502 | break; |
| 2503 | |
| 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); |
| 2510 | break; |
| 2511 | |
| 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: |
| 2518 | break; |
| 2519 | } |
| 2520 | } |
| 2521 | |
| 2522 | |
| 2523 | /*-------------------------------------------------------------------------*/ |
| 2524 | |
| 2525 | static int fsg_main_thread(void *common_) |
| 2526 | { |
| 2527 | struct fsg_common *common = common_; |
| 2528 | |
| 2529 | /* |
| 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. |
| 2532 | */ |
| 2533 | allow_signal(SIGINT); |
| 2534 | allow_signal(SIGTERM); |
| 2535 | allow_signal(SIGKILL); |
| 2536 | allow_signal(SIGUSR1); |
| 2537 | |
| 2538 | /* Allow the thread to be frozen */ |
| 2539 | set_freezable(); |
| 2540 | |
| 2541 | /* |
| 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. |
| 2545 | */ |
| 2546 | set_fs(get_ds()); |
| 2547 | |
| 2548 | /* The main loop */ |
| 2549 | while (common->state != FSG_STATE_TERMINATED) { |
| 2550 | if (exception_in_progress(common) || signal_pending(current)) { |
| 2551 | handle_exception(common); |
| 2552 | continue; |
| 2553 | } |
| 2554 | |
| 2555 | if (!common->running) { |
| 2556 | sleep_thread(common); |
| 2557 | continue; |
| 2558 | } |
| 2559 | |
| 2560 | if (get_next_command(common)) |
| 2561 | continue; |
| 2562 | |
| 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); |
| 2567 | |
| 2568 | if (do_scsi_command(common) || finish_reply(common)) |
| 2569 | continue; |
| 2570 | |
| 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); |
| 2575 | |
| 2576 | if (send_status(common)) |
| 2577 | continue; |
| 2578 | |
| 2579 | spin_lock_irq(&common->lock); |
| 2580 | if (!exception_in_progress(common)) |
| 2581 | common->state = FSG_STATE_IDLE; |
| 2582 | spin_unlock_irq(&common->lock); |
| 2583 | } |
| 2584 | |
| 2585 | spin_lock_irq(&common->lock); |
| 2586 | common->thread_task = NULL; |
| 2587 | spin_unlock_irq(&common->lock); |
| 2588 | |
| 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; |
| 2593 | |
| 2594 | down_write(&common->filesem); |
| 2595 | for (; i--; ++curlun) { |
| 2596 | if (!fsg_lun_is_open(curlun)) |
| 2597 | continue; |
| 2598 | |
| 2599 | fsg_lun_close(curlun); |
| 2600 | curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; |
| 2601 | } |
| 2602 | up_write(&common->filesem); |
| 2603 | } |
| 2604 | |
| 2605 | /* Let fsg_unbind() know the thread has exited */ |
| 2606 | complete_and_exit(&common->thread_notifier, 0); |
| 2607 | } |
| 2608 | |
| 2609 | |
| 2610 | /*************************** DEVICE ATTRIBUTES ***************************/ |
| 2611 | |
| 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); |
| 2615 | |
| 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); |
| 2620 | |
| 2621 | |
| 2622 | /****************************** FSG COMMON ******************************/ |
| 2623 | |
| 2624 | static void fsg_common_release(struct kref *ref); |
| 2625 | |
| 2626 | static void fsg_lun_release(struct device *dev) |
| 2627 | { |
| 2628 | /* Nothing needs to be done */ |
| 2629 | } |
| 2630 | |
| 2631 | static inline void fsg_common_get(struct fsg_common *common) |
| 2632 | { |
| 2633 | kref_get(&common->ref); |
| 2634 | } |
| 2635 | |
| 2636 | static inline void fsg_common_put(struct fsg_common *common) |
| 2637 | { |
| 2638 | kref_put(&common->ref, fsg_common_release); |
| 2639 | } |
| 2640 | |
| 2641 | static struct fsg_common *fsg_common_init(struct fsg_common *common, |
| 2642 | struct usb_composite_dev *cdev, |
| 2643 | struct fsg_config *cfg) |
| 2644 | { |
| 2645 | struct usb_gadget *gadget = cdev->gadget; |
| 2646 | struct fsg_buffhd *bh; |
| 2647 | struct fsg_lun *curlun; |
| 2648 | struct fsg_lun_config *lcfg; |
| 2649 | int nluns, i, rc; |
| 2650 | char *pathbuf; |
| 2651 | |
| 2652 | rc = fsg_num_buffers_validate(); |
| 2653 | if (rc != 0) |
| 2654 | return ERR_PTR(rc); |
| 2655 | |
| 2656 | /* Find out how many LUNs there should be */ |
| 2657 | nluns = cfg->nluns; |
| 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); |
| 2661 | } |
| 2662 | |
| 2663 | /* Allocate? */ |
| 2664 | if (!common) { |
| 2665 | common = kzalloc(sizeof *common, GFP_KERNEL); |
| 2666 | if (!common) |
| 2667 | return ERR_PTR(-ENOMEM); |
| 2668 | common->free_storage_on_release = 1; |
| 2669 | } else { |
| 2670 | memset(common, 0, sizeof *common); |
| 2671 | common->free_storage_on_release = 0; |
| 2672 | } |
| 2673 | |
| 2674 | common->buffhds = kcalloc(fsg_num_buffers, |
| 2675 | sizeof *(common->buffhds), GFP_KERNEL); |
| 2676 | if (!common->buffhds) { |
| 2677 | if (common->free_storage_on_release) |
| 2678 | kfree(common); |
| 2679 | return ERR_PTR(-ENOMEM); |
| 2680 | } |
| 2681 | |
| 2682 | common->ops = cfg->ops; |
| 2683 | common->private_data = cfg->private_data; |
| 2684 | |
| 2685 | common->gadget = gadget; |
| 2686 | common->ep0 = gadget->ep0; |
| 2687 | common->ep0req = cdev->req; |
| 2688 | common->cdev = cdev; |
| 2689 | |
| 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)) |
| 2694 | goto error_release; |
| 2695 | fsg_strings[FSG_STRING_INTERFACE].id = rc; |
| 2696 | fsg_intf_desc.iInterface = rc; |
| 2697 | } |
| 2698 | |
| 2699 | /* |
| 2700 | * Create the LUNs, open their backing files, and register the |
| 2701 | * LUN devices in sysfs. |
| 2702 | */ |
| 2703 | curlun = kcalloc(nluns, sizeof(*curlun), GFP_KERNEL); |
| 2704 | if (unlikely(!curlun)) { |
| 2705 | rc = -ENOMEM; |
| 2706 | goto error_release; |
| 2707 | } |
| 2708 | common->luns = curlun; |
| 2709 | |
| 2710 | init_rwsem(&common->filesem); |
| 2711 | |
| 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); |
| 2722 | |
| 2723 | rc = device_register(&curlun->dev); |
| 2724 | if (rc) { |
| 2725 | INFO(common, "failed to register LUN%d: %d\n", i, rc); |
| 2726 | common->nluns = i; |
| 2727 | put_device(&curlun->dev); |
| 2728 | goto error_release; |
| 2729 | } |
| 2730 | |
| 2731 | rc = device_create_file(&curlun->dev, |
| 2732 | curlun->cdrom |
| 2733 | ? &dev_attr_ro_cdrom |
| 2734 | : &dev_attr_ro); |
| 2735 | if (rc) |
| 2736 | goto error_luns; |
| 2737 | rc = device_create_file(&curlun->dev, |
| 2738 | curlun->removable |
| 2739 | ? &dev_attr_file |
| 2740 | : &dev_attr_file_nonremovable); |
| 2741 | if (rc) |
| 2742 | goto error_luns; |
| 2743 | rc = device_create_file(&curlun->dev, &dev_attr_nofua); |
| 2744 | if (rc) |
| 2745 | goto error_luns; |
| 2746 | |
| 2747 | if (lcfg->filename) { |
| 2748 | rc = fsg_lun_open(curlun, lcfg->filename); |
| 2749 | if (rc) |
| 2750 | goto error_luns; |
| 2751 | } else if (!curlun->removable) { |
| 2752 | ERROR(common, "no file given for LUN%d\n", i); |
| 2753 | rc = -EINVAL; |
| 2754 | goto error_luns; |
| 2755 | } |
| 2756 | } |
| 2757 | common->nluns = nluns; |
| 2758 | |
| 2759 | /* Data buffers cyclic list */ |
| 2760 | bh = common->buffhds; |
| 2761 | i = fsg_num_buffers; |
| 2762 | goto buffhds_first_it; |
| 2763 | do { |
| 2764 | bh->next = bh + 1; |
| 2765 | ++bh; |
| 2766 | buffhds_first_it: |
| 2767 | bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL); |
| 2768 | if (unlikely(!bh->buf)) { |
| 2769 | rc = -ENOMEM; |
| 2770 | goto error_release; |
| 2771 | } |
| 2772 | } while (--i); |
| 2773 | bh->next = common->buffhds; |
| 2774 | |
| 2775 | /* Prepare inquiryString */ |
| 2776 | if (cfg->release != 0xffff) { |
| 2777 | i = cfg->release; |
| 2778 | } else { |
| 2779 | i = usb_gadget_controller_number(gadget); |
| 2780 | if (i >= 0) { |
| 2781 | i = 0x0300 + i; |
| 2782 | } else { |
| 2783 | WARNING(common, "controller '%s' not recognized\n", |
| 2784 | gadget->name); |
| 2785 | i = 0x0399; |
| 2786 | } |
| 2787 | } |
| 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"), |
| 2794 | i); |
| 2795 | |
| 2796 | /* |
| 2797 | * Some peripheral controllers are known not to be able to |
| 2798 | * halt bulk endpoints correctly. If one of them is present, |
| 2799 | * disable stalls. |
| 2800 | */ |
| 2801 | common->can_stall = cfg->can_stall && |
| 2802 | !(gadget_is_at91(common->gadget)); |
| 2803 | |
| 2804 | spin_lock_init(&common->lock); |
| 2805 | kref_init(&common->ref); |
| 2806 | |
| 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); |
| 2812 | goto error_release; |
| 2813 | } |
| 2814 | init_completion(&common->thread_notifier); |
| 2815 | init_waitqueue_head(&common->fsg_wait); |
| 2816 | |
| 2817 | /* Information */ |
| 2818 | INFO(common, FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); |
| 2819 | INFO(common, "Number of LUNs=%d\n", common->nluns); |
| 2820 | |
| 2821 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); |
| 2822 | for (i = 0, nluns = common->nluns, curlun = common->luns; |
| 2823 | i < nluns; |
| 2824 | ++curlun, ++i) { |
| 2825 | char *p = "(no medium)"; |
| 2826 | if (fsg_lun_is_open(curlun)) { |
| 2827 | p = "(error)"; |
| 2828 | if (pathbuf) { |
| 2829 | p = d_path(&curlun->filp->f_path, |
| 2830 | pathbuf, PATH_MAX); |
| 2831 | if (IS_ERR(p)) |
| 2832 | p = "(error)"; |
| 2833 | } |
| 2834 | } |
| 2835 | LINFO(curlun, "LUN: %s%s%sfile: %s\n", |
| 2836 | curlun->removable ? "removable " : "", |
| 2837 | curlun->ro ? "read only " : "", |
| 2838 | curlun->cdrom ? "CD-ROM " : "", |
| 2839 | p); |
| 2840 | } |
| 2841 | kfree(pathbuf); |
| 2842 | |
| 2843 | DBG(common, "I/O thread pid: %d\n", task_pid_nr(common->thread_task)); |
| 2844 | |
| 2845 | wake_up_process(common->thread_task); |
| 2846 | |
| 2847 | return common; |
| 2848 | |
| 2849 | error_luns: |
| 2850 | common->nluns = i + 1; |
| 2851 | error_release: |
| 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); |
| 2855 | return ERR_PTR(rc); |
| 2856 | } |
| 2857 | |
| 2858 | static void fsg_common_release(struct kref *ref) |
| 2859 | { |
| 2860 | struct fsg_common *common = container_of(ref, struct fsg_common, ref); |
| 2861 | |
| 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); |
| 2866 | } |
| 2867 | |
| 2868 | if (likely(common->luns)) { |
| 2869 | struct fsg_lun *lun = common->luns; |
| 2870 | unsigned i = common->nluns; |
| 2871 | |
| 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, |
| 2876 | lun->cdrom |
| 2877 | ? &dev_attr_ro_cdrom |
| 2878 | : &dev_attr_ro); |
| 2879 | device_remove_file(&lun->dev, |
| 2880 | lun->removable |
| 2881 | ? &dev_attr_file |
| 2882 | : &dev_attr_file_nonremovable); |
| 2883 | fsg_lun_close(lun); |
| 2884 | device_unregister(&lun->dev); |
| 2885 | } |
| 2886 | |
| 2887 | kfree(common->luns); |
| 2888 | } |
| 2889 | |
| 2890 | { |
| 2891 | struct fsg_buffhd *bh = common->buffhds; |
| 2892 | unsigned i = fsg_num_buffers; |
| 2893 | do { |
| 2894 | kfree(bh->buf); |
| 2895 | } while (++bh, --i); |
| 2896 | } |
| 2897 | |
| 2898 | kfree(common->buffhds); |
| 2899 | if (common->free_storage_on_release) |
| 2900 | kfree(common); |
| 2901 | } |
| 2902 | |
| 2903 | |
| 2904 | /*-------------------------------------------------------------------------*/ |
| 2905 | |
| 2906 | static void fsg_unbind(struct usb_configuration *c, struct usb_function *f) |
| 2907 | { |
| 2908 | struct fsg_dev *fsg = fsg_from_func(f); |
| 2909 | struct fsg_common *common = fsg->common; |
| 2910 | |
| 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); |
| 2917 | } |
| 2918 | |
| 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); |
| 2923 | kfree(fsg); |
| 2924 | } |
| 2925 | |
| 2926 | static int fsg_bind(struct usb_configuration *c, struct usb_function *f) |
| 2927 | { |
| 2928 | struct fsg_dev *fsg = fsg_from_func(f); |
| 2929 | struct usb_gadget *gadget = c->cdev->gadget; |
| 2930 | int i; |
| 2931 | struct usb_ep *ep; |
| 2932 | |
| 2933 | fsg->gadget = gadget; |
| 2934 | |
| 2935 | /* New interface */ |
| 2936 | i = usb_interface_id(c, f); |
| 2937 | if (i < 0) |
| 2938 | return i; |
| 2939 | fsg_intf_desc.bInterfaceNumber = i; |
| 2940 | fsg->interface_number = i; |
| 2941 | |
| 2942 | /* Find all the endpoints we will use */ |
| 2943 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc); |
| 2944 | if (!ep) |
| 2945 | goto autoconf_fail; |
| 2946 | ep->driver_data = fsg->common; /* claim the endpoint */ |
| 2947 | fsg->bulk_in = ep; |
| 2948 | |
| 2949 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc); |
| 2950 | if (!ep) |
| 2951 | goto autoconf_fail; |
| 2952 | ep->driver_data = fsg->common; /* claim the endpoint */ |
| 2953 | fsg->bulk_out = ep; |
| 2954 | |
| 2955 | /* Copy descriptors */ |
| 2956 | f->descriptors = usb_copy_descriptors(fsg_fs_function); |
| 2957 | if (unlikely(!f->descriptors)) |
| 2958 | return -ENOMEM; |
| 2959 | |
| 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); |
| 2969 | return -ENOMEM; |
| 2970 | } |
| 2971 | } |
| 2972 | |
| 2973 | if (gadget_is_superspeed(gadget)) { |
| 2974 | unsigned max_burst; |
| 2975 | |
| 2976 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
| 2977 | max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15); |
| 2978 | |
| 2979 | fsg_ss_bulk_in_desc.bEndpointAddress = |
| 2980 | fsg_fs_bulk_in_desc.bEndpointAddress; |
| 2981 | fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst; |
| 2982 | |
| 2983 | fsg_ss_bulk_out_desc.bEndpointAddress = |
| 2984 | fsg_fs_bulk_out_desc.bEndpointAddress; |
| 2985 | fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst; |
| 2986 | |
| 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); |
| 2991 | return -ENOMEM; |
| 2992 | } |
| 2993 | } |
| 2994 | |
| 2995 | return 0; |
| 2996 | |
| 2997 | autoconf_fail: |
| 2998 | ERROR(fsg, "unable to autoconfigure all endpoints\n"); |
| 2999 | return -ENOTSUPP; |
| 3000 | } |
| 3001 | |
| 3002 | |
| 3003 | /****************************** ADD FUNCTION ******************************/ |
| 3004 | |
| 3005 | static struct usb_gadget_strings *fsg_strings_array[] = { |
| 3006 | &fsg_stringtab, |
| 3007 | NULL, |
| 3008 | }; |
| 3009 | |
| 3010 | static int fsg_bind_config(struct usb_composite_dev *cdev, |
| 3011 | struct usb_configuration *c, |
| 3012 | struct fsg_common *common) |
| 3013 | { |
| 3014 | struct fsg_dev *fsg; |
| 3015 | int rc; |
| 3016 | |
| 3017 | fsg = kzalloc(sizeof *fsg, GFP_KERNEL); |
| 3018 | if (unlikely(!fsg)) |
| 3019 | return -ENOMEM; |
| 3020 | |
| 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; |
| 3028 | |
| 3029 | fsg->common = common; |
| 3030 | /* |
| 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. |
| 3036 | */ |
| 3037 | |
| 3038 | rc = usb_add_function(c, &fsg->function); |
| 3039 | if (unlikely(rc)) |
| 3040 | kfree(fsg); |
| 3041 | else |
| 3042 | fsg_common_get(fsg->common); |
| 3043 | return rc; |
| 3044 | } |
| 3045 | |
| 3046 | |
| 3047 | /************************* Module parameters *************************/ |
| 3048 | |
| 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]; |
| 3055 | |
| 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 */ |
| 3060 | }; |
| 3061 | |
| 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, \ |
| 3065 | S_IRUGO); \ |
| 3066 | MODULE_PARM_DESC(prefix ## name, desc) |
| 3067 | |
| 3068 | #define _FSG_MODULE_PARAM(prefix, params, name, type, desc) \ |
| 3069 | module_param_named(prefix ## name, params.name, type, \ |
| 3070 | S_IRUGO); \ |
| 3071 | MODULE_PARM_DESC(prefix ## name, desc) |
| 3072 | |
| 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") |
| 3088 | |
| 3089 | static void |
| 3090 | fsg_config_from_params(struct fsg_config *cfg, |
| 3091 | const struct fsg_module_parameters *params) |
| 3092 | { |
| 3093 | struct fsg_lun_config *lun; |
| 3094 | unsigned i; |
| 3095 | |
| 3096 | /* Configure LUNs */ |
| 3097 | cfg->nluns = |
| 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]; |
| 3104 | lun->filename = |
| 3105 | params->file_count > i && params->file[i][0] |
| 3106 | ? params->file[i] |
| 3107 | : 0; |
| 3108 | } |
| 3109 | |
| 3110 | /* Let MSF use defaults */ |
| 3111 | cfg->vendor_name = 0; |
| 3112 | cfg->product_name = 0; |
| 3113 | cfg->release = 0xffff; |
| 3114 | |
| 3115 | cfg->ops = NULL; |
| 3116 | cfg->private_data = NULL; |
| 3117 | |
| 3118 | /* Finalise */ |
| 3119 | cfg->can_stall = params->stall; |
| 3120 | } |
| 3121 | |
| 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) |
| 3131 | { |
| 3132 | struct fsg_config cfg; |
| 3133 | fsg_config_from_params(&cfg, params); |
| 3134 | return fsg_common_init(common, cdev, &cfg); |
| 3135 | } |