Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1 | /* |
| 2 | * f_fs.c -- user mode filesystem api for usb composite funtcion controllers |
| 3 | * |
| 4 | * Copyright (C) 2010 Samsung Electronics |
| 5 | * Author: Michal Nazarewicz <m.nazarewicz@samsung.com> |
| 6 | * |
| 7 | * Based on inode.c (GadgetFS): |
| 8 | * Copyright (C) 2003-2004 David Brownell |
| 9 | * Copyright (C) 2003 Agilent Technologies |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | /* #define DEBUG */ |
| 28 | /* #define VERBOSE_DEBUG */ |
| 29 | |
| 30 | #include <linux/blkdev.h> |
Randy Dunlap | b060869 | 2010-05-10 10:51:36 -0700 | [diff] [blame] | 31 | #include <linux/pagemap.h> |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 32 | #include <asm/unaligned.h> |
| 33 | #include <linux/smp_lock.h> |
| 34 | |
| 35 | #include <linux/usb/composite.h> |
| 36 | #include <linux/usb/functionfs.h> |
| 37 | |
| 38 | |
| 39 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ |
| 40 | |
| 41 | |
| 42 | /* Debuging *****************************************************************/ |
| 43 | |
| 44 | #define ffs_printk(level, fmt, args...) printk(level "f_fs: " fmt "\n", ## args) |
| 45 | |
| 46 | #define FERR(...) ffs_printk(KERN_ERR, __VA_ARGS__) |
| 47 | #define FINFO(...) ffs_printk(KERN_INFO, __VA_ARGS__) |
| 48 | |
| 49 | #ifdef DEBUG |
| 50 | # define FDBG(...) ffs_printk(KERN_DEBUG, __VA_ARGS__) |
| 51 | #else |
| 52 | # define FDBG(...) do { } while (0) |
| 53 | #endif /* DEBUG */ |
| 54 | |
| 55 | #ifdef VERBOSE_DEBUG |
| 56 | # define FVDBG FDBG |
| 57 | #else |
| 58 | # define FVDBG(...) do { } while (0) |
| 59 | #endif /* VERBOSE_DEBUG */ |
| 60 | |
| 61 | #define ENTER() FVDBG("%s()", __func__) |
| 62 | |
| 63 | #ifdef VERBOSE_DEBUG |
| 64 | # define ffs_dump_mem(prefix, ptr, len) \ |
| 65 | print_hex_dump_bytes("f_fs" prefix ": ", DUMP_PREFIX_NONE, ptr, len) |
| 66 | #else |
| 67 | # define ffs_dump_mem(prefix, ptr, len) do { } while (0) |
| 68 | #endif |
| 69 | |
| 70 | |
| 71 | /* The data structure and setup file ****************************************/ |
| 72 | |
| 73 | enum ffs_state { |
| 74 | /* Waiting for descriptors and strings. */ |
| 75 | /* In this state no open(2), read(2) or write(2) on epfiles |
| 76 | * may succeed (which should not be the problem as there |
| 77 | * should be no such files opened in the firts place). */ |
| 78 | FFS_READ_DESCRIPTORS, |
| 79 | FFS_READ_STRINGS, |
| 80 | |
| 81 | /* We've got descriptors and strings. We are or have called |
| 82 | * functionfs_ready_callback(). functionfs_bind() may have |
| 83 | * been called but we don't know. */ |
| 84 | /* This is the only state in which operations on epfiles may |
| 85 | * succeed. */ |
| 86 | FFS_ACTIVE, |
| 87 | |
| 88 | /* All endpoints have been closed. This state is also set if |
| 89 | * we encounter an unrecoverable error. The only |
| 90 | * unrecoverable error is situation when after reading strings |
| 91 | * from user space we fail to initialise EP files or |
| 92 | * functionfs_ready_callback() returns with error (<0). */ |
| 93 | /* In this state no open(2), read(2) or write(2) (both on ep0 |
| 94 | * as well as epfile) may succeed (at this point epfiles are |
| 95 | * unlinked and all closed so this is not a problem; ep0 is |
| 96 | * also closed but ep0 file exists and so open(2) on ep0 must |
| 97 | * fail). */ |
| 98 | FFS_CLOSING |
| 99 | }; |
| 100 | |
| 101 | |
| 102 | enum ffs_setup_state { |
| 103 | /* There is no setup request pending. */ |
| 104 | FFS_NO_SETUP, |
| 105 | /* User has read events and there was a setup request event |
| 106 | * there. The next read/write on ep0 will handle the |
| 107 | * request. */ |
| 108 | FFS_SETUP_PENDING, |
| 109 | /* There was event pending but before user space handled it |
| 110 | * some other event was introduced which canceled existing |
| 111 | * setup. If this state is set read/write on ep0 return |
| 112 | * -EIDRM. This state is only set when adding event. */ |
| 113 | FFS_SETUP_CANCELED |
| 114 | }; |
| 115 | |
| 116 | |
| 117 | |
| 118 | struct ffs_epfile; |
| 119 | struct ffs_function; |
| 120 | |
| 121 | struct ffs_data { |
| 122 | struct usb_gadget *gadget; |
| 123 | |
| 124 | /* Protect access read/write operations, only one read/write |
| 125 | * at a time. As a consequence protects ep0req and company. |
| 126 | * While setup request is being processed (queued) this is |
| 127 | * held. */ |
| 128 | struct mutex mutex; |
| 129 | |
| 130 | /* Protect access to enpoint related structures (basically |
| 131 | * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for |
| 132 | * endpint zero. */ |
| 133 | spinlock_t eps_lock; |
| 134 | |
| 135 | /* XXX REVISIT do we need our own request? Since we are not |
| 136 | * handling setup requests immidiatelly user space may be so |
| 137 | * slow that another setup will be sent to the gadget but this |
| 138 | * time not to us but another function and then there could be |
Linus Torvalds | a4ce96a | 2010-07-21 09:25:42 -0700 | [diff] [blame] | 139 | * a race. Is that the case? Or maybe we can use cdev->req |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 140 | * after all, maybe we just need some spinlock for that? */ |
| 141 | struct usb_request *ep0req; /* P: mutex */ |
| 142 | struct completion ep0req_completion; /* P: mutex */ |
| 143 | int ep0req_status; /* P: mutex */ |
| 144 | |
| 145 | /* reference counter */ |
| 146 | atomic_t ref; |
| 147 | /* how many files are opened (EP0 and others) */ |
| 148 | atomic_t opened; |
| 149 | |
| 150 | /* EP0 state */ |
| 151 | enum ffs_state state; |
| 152 | |
| 153 | /* |
| 154 | * Possible transations: |
| 155 | * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock |
| 156 | * happens only in ep0 read which is P: mutex |
| 157 | * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock |
| 158 | * happens only in ep0 i/o which is P: mutex |
| 159 | * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock |
| 160 | * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg |
| 161 | */ |
| 162 | enum ffs_setup_state setup_state; |
| 163 | |
| 164 | #define FFS_SETUP_STATE(ffs) \ |
| 165 | ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ |
| 166 | FFS_SETUP_CANCELED, FFS_NO_SETUP)) |
| 167 | |
| 168 | /* Events & such. */ |
| 169 | struct { |
| 170 | u8 types[4]; |
| 171 | unsigned short count; |
| 172 | /* XXX REVISIT need to update it in some places, or do we? */ |
| 173 | unsigned short can_stall; |
| 174 | struct usb_ctrlrequest setup; |
| 175 | |
| 176 | wait_queue_head_t waitq; |
| 177 | } ev; /* the whole structure, P: ev.waitq.lock */ |
| 178 | |
| 179 | /* Flags */ |
| 180 | unsigned long flags; |
| 181 | #define FFS_FL_CALL_CLOSED_CALLBACK 0 |
| 182 | #define FFS_FL_BOUND 1 |
| 183 | |
| 184 | /* Active function */ |
| 185 | struct ffs_function *func; |
| 186 | |
| 187 | /* Device name, write once when file system is mounted. |
| 188 | * Intendet for user to read if she wants. */ |
| 189 | const char *dev_name; |
| 190 | /* Private data for our user (ie. gadget). Managed by |
| 191 | * user. */ |
| 192 | void *private_data; |
| 193 | |
| 194 | /* filled by __ffs_data_got_descs() */ |
| 195 | /* real descriptors are 16 bytes after raw_descs (so you need |
| 196 | * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the |
| 197 | * first full speed descriptor). raw_descs_length and |
| 198 | * raw_fs_descs_length do not have those 16 bytes added. */ |
| 199 | const void *raw_descs; |
| 200 | unsigned raw_descs_length; |
| 201 | unsigned raw_fs_descs_length; |
| 202 | unsigned fs_descs_count; |
| 203 | unsigned hs_descs_count; |
| 204 | |
| 205 | unsigned short strings_count; |
| 206 | unsigned short interfaces_count; |
| 207 | unsigned short eps_count; |
| 208 | unsigned short _pad1; |
| 209 | |
| 210 | /* filled by __ffs_data_got_strings() */ |
| 211 | /* ids in stringtabs are set in functionfs_bind() */ |
| 212 | const void *raw_strings; |
| 213 | struct usb_gadget_strings **stringtabs; |
| 214 | |
| 215 | /* File system's super block, write once when file system is mounted. */ |
| 216 | struct super_block *sb; |
| 217 | |
| 218 | /* File permissions, written once when fs is mounted*/ |
| 219 | struct ffs_file_perms { |
| 220 | umode_t mode; |
| 221 | uid_t uid; |
| 222 | gid_t gid; |
| 223 | } file_perms; |
| 224 | |
| 225 | /* The endpoint files, filled by ffs_epfiles_create(), |
| 226 | * destroyed by ffs_epfiles_destroy(). */ |
| 227 | struct ffs_epfile *epfiles; |
| 228 | }; |
| 229 | |
| 230 | /* Reference counter handling */ |
| 231 | static void ffs_data_get(struct ffs_data *ffs); |
| 232 | static void ffs_data_put(struct ffs_data *ffs); |
| 233 | /* Creates new ffs_data object. */ |
| 234 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); |
| 235 | |
| 236 | /* Opened counter handling. */ |
| 237 | static void ffs_data_opened(struct ffs_data *ffs); |
| 238 | static void ffs_data_closed(struct ffs_data *ffs); |
| 239 | |
| 240 | /* Called with ffs->mutex held; take over ownerrship of data. */ |
| 241 | static int __must_check |
| 242 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); |
| 243 | static int __must_check |
| 244 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); |
| 245 | |
| 246 | |
| 247 | /* The function structure ***************************************************/ |
| 248 | |
| 249 | struct ffs_ep; |
| 250 | |
| 251 | struct ffs_function { |
| 252 | struct usb_configuration *conf; |
| 253 | struct usb_gadget *gadget; |
| 254 | struct ffs_data *ffs; |
| 255 | |
| 256 | struct ffs_ep *eps; |
| 257 | u8 eps_revmap[16]; |
| 258 | short *interfaces_nums; |
| 259 | |
| 260 | struct usb_function function; |
| 261 | }; |
| 262 | |
| 263 | |
| 264 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) |
| 265 | { |
| 266 | return container_of(f, struct ffs_function, function); |
| 267 | } |
| 268 | |
| 269 | static void ffs_func_free(struct ffs_function *func); |
| 270 | |
| 271 | |
| 272 | static void ffs_func_eps_disable(struct ffs_function *func); |
| 273 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); |
| 274 | |
| 275 | |
| 276 | static int ffs_func_bind(struct usb_configuration *, |
| 277 | struct usb_function *); |
| 278 | static void ffs_func_unbind(struct usb_configuration *, |
| 279 | struct usb_function *); |
| 280 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
| 281 | static void ffs_func_disable(struct usb_function *); |
| 282 | static int ffs_func_setup(struct usb_function *, |
| 283 | const struct usb_ctrlrequest *); |
| 284 | static void ffs_func_suspend(struct usb_function *); |
| 285 | static void ffs_func_resume(struct usb_function *); |
| 286 | |
| 287 | |
| 288 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); |
| 289 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); |
| 290 | |
| 291 | |
| 292 | |
| 293 | /* The endpoints structures *************************************************/ |
| 294 | |
| 295 | struct ffs_ep { |
| 296 | struct usb_ep *ep; /* P: ffs->eps_lock */ |
| 297 | struct usb_request *req; /* P: epfile->mutex */ |
| 298 | |
| 299 | /* [0]: full speed, [1]: high speed */ |
| 300 | struct usb_endpoint_descriptor *descs[2]; |
| 301 | |
| 302 | u8 num; |
| 303 | |
| 304 | int status; /* P: epfile->mutex */ |
| 305 | }; |
| 306 | |
| 307 | struct ffs_epfile { |
| 308 | /* Protects ep->ep and ep->req. */ |
| 309 | struct mutex mutex; |
| 310 | wait_queue_head_t wait; |
| 311 | |
| 312 | struct ffs_data *ffs; |
| 313 | struct ffs_ep *ep; /* P: ffs->eps_lock */ |
| 314 | |
| 315 | struct dentry *dentry; |
| 316 | |
| 317 | char name[5]; |
| 318 | |
| 319 | unsigned char in; /* P: ffs->eps_lock */ |
| 320 | unsigned char isoc; /* P: ffs->eps_lock */ |
| 321 | |
| 322 | unsigned char _pad; |
| 323 | }; |
| 324 | |
| 325 | |
| 326 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
| 327 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); |
| 328 | |
| 329 | static struct inode *__must_check |
| 330 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
| 331 | const struct file_operations *fops, |
| 332 | struct dentry **dentry_p); |
| 333 | |
| 334 | |
| 335 | /* Misc helper functions ****************************************************/ |
| 336 | |
| 337 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) |
| 338 | __attribute__((warn_unused_result, nonnull)); |
| 339 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
| 340 | __attribute__((warn_unused_result, nonnull)); |
| 341 | |
| 342 | |
| 343 | /* Control file aka ep0 *****************************************************/ |
| 344 | |
| 345 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) |
| 346 | { |
| 347 | struct ffs_data *ffs = req->context; |
| 348 | |
| 349 | complete_all(&ffs->ep0req_completion); |
| 350 | } |
| 351 | |
| 352 | |
| 353 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
| 354 | { |
| 355 | struct usb_request *req = ffs->ep0req; |
| 356 | int ret; |
| 357 | |
| 358 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); |
| 359 | |
| 360 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 361 | |
| 362 | req->buf = data; |
| 363 | req->length = len; |
| 364 | |
| 365 | INIT_COMPLETION(ffs->ep0req_completion); |
| 366 | |
| 367 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); |
| 368 | if (unlikely(ret < 0)) |
| 369 | return ret; |
| 370 | |
| 371 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); |
| 372 | if (unlikely(ret)) { |
| 373 | usb_ep_dequeue(ffs->gadget->ep0, req); |
| 374 | return -EINTR; |
| 375 | } |
| 376 | |
| 377 | ffs->setup_state = FFS_NO_SETUP; |
| 378 | return ffs->ep0req_status; |
| 379 | } |
| 380 | |
| 381 | static int __ffs_ep0_stall(struct ffs_data *ffs) |
| 382 | { |
| 383 | if (ffs->ev.can_stall) { |
| 384 | FVDBG("ep0 stall\n"); |
| 385 | usb_ep_set_halt(ffs->gadget->ep0); |
| 386 | ffs->setup_state = FFS_NO_SETUP; |
| 387 | return -EL2HLT; |
| 388 | } else { |
| 389 | FDBG("bogus ep0 stall!\n"); |
| 390 | return -ESRCH; |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | |
| 395 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
| 396 | size_t len, loff_t *ptr) |
| 397 | { |
| 398 | struct ffs_data *ffs = file->private_data; |
| 399 | ssize_t ret; |
| 400 | char *data; |
| 401 | |
| 402 | ENTER(); |
| 403 | |
| 404 | /* Fast check if setup was canceled */ |
| 405 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) |
| 406 | return -EIDRM; |
| 407 | |
| 408 | /* Acquire mutex */ |
| 409 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); |
| 410 | if (unlikely(ret < 0)) |
| 411 | return ret; |
| 412 | |
| 413 | |
| 414 | /* Check state */ |
| 415 | switch (ffs->state) { |
| 416 | case FFS_READ_DESCRIPTORS: |
| 417 | case FFS_READ_STRINGS: |
| 418 | /* Copy data */ |
| 419 | if (unlikely(len < 16)) { |
| 420 | ret = -EINVAL; |
| 421 | break; |
| 422 | } |
| 423 | |
| 424 | data = ffs_prepare_buffer(buf, len); |
| 425 | if (unlikely(IS_ERR(data))) { |
| 426 | ret = PTR_ERR(data); |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | /* Handle data */ |
| 431 | if (ffs->state == FFS_READ_DESCRIPTORS) { |
| 432 | FINFO("read descriptors"); |
| 433 | ret = __ffs_data_got_descs(ffs, data, len); |
| 434 | if (unlikely(ret < 0)) |
| 435 | break; |
| 436 | |
| 437 | ffs->state = FFS_READ_STRINGS; |
| 438 | ret = len; |
| 439 | } else { |
| 440 | FINFO("read strings"); |
| 441 | ret = __ffs_data_got_strings(ffs, data, len); |
| 442 | if (unlikely(ret < 0)) |
| 443 | break; |
| 444 | |
| 445 | ret = ffs_epfiles_create(ffs); |
| 446 | if (unlikely(ret)) { |
| 447 | ffs->state = FFS_CLOSING; |
| 448 | break; |
| 449 | } |
| 450 | |
| 451 | ffs->state = FFS_ACTIVE; |
| 452 | mutex_unlock(&ffs->mutex); |
| 453 | |
| 454 | ret = functionfs_ready_callback(ffs); |
| 455 | if (unlikely(ret < 0)) { |
| 456 | ffs->state = FFS_CLOSING; |
| 457 | return ret; |
| 458 | } |
| 459 | |
| 460 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
| 461 | return len; |
| 462 | } |
| 463 | break; |
| 464 | |
| 465 | |
| 466 | case FFS_ACTIVE: |
| 467 | data = NULL; |
| 468 | /* We're called from user space, we can use _irq |
| 469 | * rather then _irqsave */ |
| 470 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 471 | switch (FFS_SETUP_STATE(ffs)) { |
| 472 | case FFS_SETUP_CANCELED: |
| 473 | ret = -EIDRM; |
| 474 | goto done_spin; |
| 475 | |
| 476 | case FFS_NO_SETUP: |
| 477 | ret = -ESRCH; |
| 478 | goto done_spin; |
| 479 | |
| 480 | case FFS_SETUP_PENDING: |
| 481 | break; |
| 482 | } |
| 483 | |
| 484 | /* FFS_SETUP_PENDING */ |
| 485 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { |
| 486 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 487 | ret = __ffs_ep0_stall(ffs); |
| 488 | break; |
| 489 | } |
| 490 | |
| 491 | /* FFS_SETUP_PENDING and not stall */ |
| 492 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); |
| 493 | |
| 494 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 495 | |
| 496 | data = ffs_prepare_buffer(buf, len); |
| 497 | if (unlikely(IS_ERR(data))) { |
| 498 | ret = PTR_ERR(data); |
| 499 | break; |
| 500 | } |
| 501 | |
| 502 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 503 | |
| 504 | /* We are guaranteed to be still in FFS_ACTIVE state |
| 505 | * but the state of setup could have changed from |
| 506 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need |
| 507 | * to check for that. If that happened we copied data |
| 508 | * from user space in vain but it's unlikely. */ |
| 509 | /* For sure we are not in FFS_NO_SETUP since this is |
| 510 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
| 511 | * transition can be performed and it's protected by |
| 512 | * mutex. */ |
| 513 | |
| 514 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
| 515 | ret = -EIDRM; |
| 516 | done_spin: |
| 517 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 518 | } else { |
| 519 | /* unlocks spinlock */ |
| 520 | ret = __ffs_ep0_queue_wait(ffs, data, len); |
| 521 | } |
| 522 | kfree(data); |
| 523 | break; |
| 524 | |
| 525 | |
| 526 | default: |
| 527 | ret = -EBADFD; |
| 528 | break; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | mutex_unlock(&ffs->mutex); |
| 533 | return ret; |
| 534 | } |
| 535 | |
| 536 | |
| 537 | |
| 538 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
| 539 | size_t n) |
| 540 | { |
| 541 | /* We are holding ffs->ev.waitq.lock and ffs->mutex and we need |
| 542 | * to release them. */ |
| 543 | |
| 544 | struct usb_functionfs_event events[n]; |
| 545 | unsigned i = 0; |
| 546 | |
| 547 | memset(events, 0, sizeof events); |
| 548 | |
| 549 | do { |
| 550 | events[i].type = ffs->ev.types[i]; |
| 551 | if (events[i].type == FUNCTIONFS_SETUP) { |
| 552 | events[i].u.setup = ffs->ev.setup; |
| 553 | ffs->setup_state = FFS_SETUP_PENDING; |
| 554 | } |
| 555 | } while (++i < n); |
| 556 | |
| 557 | if (n < ffs->ev.count) { |
| 558 | ffs->ev.count -= n; |
| 559 | memmove(ffs->ev.types, ffs->ev.types + n, |
| 560 | ffs->ev.count * sizeof *ffs->ev.types); |
| 561 | } else { |
| 562 | ffs->ev.count = 0; |
| 563 | } |
| 564 | |
| 565 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 566 | mutex_unlock(&ffs->mutex); |
| 567 | |
| 568 | return unlikely(__copy_to_user(buf, events, sizeof events)) |
| 569 | ? -EFAULT : sizeof events; |
| 570 | } |
| 571 | |
| 572 | |
| 573 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
| 574 | size_t len, loff_t *ptr) |
| 575 | { |
| 576 | struct ffs_data *ffs = file->private_data; |
| 577 | char *data = NULL; |
| 578 | size_t n; |
| 579 | int ret; |
| 580 | |
| 581 | ENTER(); |
| 582 | |
| 583 | /* Fast check if setup was canceled */ |
| 584 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) |
| 585 | return -EIDRM; |
| 586 | |
| 587 | /* Acquire mutex */ |
| 588 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); |
| 589 | if (unlikely(ret < 0)) |
| 590 | return ret; |
| 591 | |
| 592 | |
| 593 | /* Check state */ |
| 594 | if (ffs->state != FFS_ACTIVE) { |
| 595 | ret = -EBADFD; |
| 596 | goto done_mutex; |
| 597 | } |
| 598 | |
| 599 | |
| 600 | /* We're called from user space, we can use _irq rather then |
| 601 | * _irqsave */ |
| 602 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 603 | |
| 604 | switch (FFS_SETUP_STATE(ffs)) { |
| 605 | case FFS_SETUP_CANCELED: |
| 606 | ret = -EIDRM; |
| 607 | break; |
| 608 | |
| 609 | case FFS_NO_SETUP: |
| 610 | n = len / sizeof(struct usb_functionfs_event); |
| 611 | if (unlikely(!n)) { |
| 612 | ret = -EINVAL; |
| 613 | break; |
| 614 | } |
| 615 | |
| 616 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { |
| 617 | ret = -EAGAIN; |
| 618 | break; |
| 619 | } |
| 620 | |
| 621 | if (unlikely(wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, ffs->ev.count))) { |
| 622 | ret = -EINTR; |
| 623 | break; |
| 624 | } |
| 625 | |
| 626 | return __ffs_ep0_read_events(ffs, buf, |
| 627 | min(n, (size_t)ffs->ev.count)); |
| 628 | |
| 629 | |
| 630 | case FFS_SETUP_PENDING: |
| 631 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { |
| 632 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 633 | ret = __ffs_ep0_stall(ffs); |
| 634 | goto done_mutex; |
| 635 | } |
| 636 | |
| 637 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); |
| 638 | |
| 639 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 640 | |
| 641 | if (likely(len)) { |
| 642 | data = kmalloc(len, GFP_KERNEL); |
| 643 | if (unlikely(!data)) { |
| 644 | ret = -ENOMEM; |
| 645 | goto done_mutex; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 650 | |
| 651 | /* See ffs_ep0_write() */ |
| 652 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
| 653 | ret = -EIDRM; |
| 654 | break; |
| 655 | } |
| 656 | |
| 657 | /* unlocks spinlock */ |
| 658 | ret = __ffs_ep0_queue_wait(ffs, data, len); |
| 659 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) |
| 660 | ret = -EFAULT; |
| 661 | goto done_mutex; |
| 662 | |
| 663 | default: |
| 664 | ret = -EBADFD; |
| 665 | break; |
| 666 | } |
| 667 | |
| 668 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 669 | done_mutex: |
| 670 | mutex_unlock(&ffs->mutex); |
| 671 | kfree(data); |
| 672 | return ret; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | |
| 677 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
| 678 | { |
| 679 | struct ffs_data *ffs = inode->i_private; |
| 680 | |
| 681 | ENTER(); |
| 682 | |
| 683 | if (unlikely(ffs->state == FFS_CLOSING)) |
| 684 | return -EBUSY; |
| 685 | |
| 686 | file->private_data = ffs; |
| 687 | ffs_data_opened(ffs); |
| 688 | |
| 689 | return 0; |
| 690 | } |
| 691 | |
| 692 | |
| 693 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
| 694 | { |
| 695 | struct ffs_data *ffs = file->private_data; |
| 696 | |
| 697 | ENTER(); |
| 698 | |
| 699 | ffs_data_closed(ffs); |
| 700 | |
| 701 | return 0; |
| 702 | } |
| 703 | |
| 704 | |
| 705 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
| 706 | { |
| 707 | struct ffs_data *ffs = file->private_data; |
| 708 | struct usb_gadget *gadget = ffs->gadget; |
| 709 | long ret; |
| 710 | |
| 711 | ENTER(); |
| 712 | |
| 713 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { |
| 714 | struct ffs_function *func = ffs->func; |
| 715 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; |
| 716 | } else if (gadget->ops->ioctl) { |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 717 | ret = gadget->ops->ioctl(gadget, code, value); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 718 | } else { |
| 719 | ret = -ENOTTY; |
| 720 | } |
| 721 | |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | |
| 726 | static const struct file_operations ffs_ep0_operations = { |
| 727 | .owner = THIS_MODULE, |
| 728 | .llseek = no_llseek, |
| 729 | |
| 730 | .open = ffs_ep0_open, |
| 731 | .write = ffs_ep0_write, |
| 732 | .read = ffs_ep0_read, |
| 733 | .release = ffs_ep0_release, |
| 734 | .unlocked_ioctl = ffs_ep0_ioctl, |
| 735 | }; |
| 736 | |
| 737 | |
| 738 | /* "Normal" endpoints operations ********************************************/ |
| 739 | |
| 740 | |
| 741 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
| 742 | { |
| 743 | ENTER(); |
| 744 | if (likely(req->context)) { |
| 745 | struct ffs_ep *ep = _ep->driver_data; |
| 746 | ep->status = req->status ? req->status : req->actual; |
| 747 | complete(req->context); |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | |
| 752 | static ssize_t ffs_epfile_io(struct file *file, |
| 753 | char __user *buf, size_t len, int read) |
| 754 | { |
| 755 | struct ffs_epfile *epfile = file->private_data; |
| 756 | struct ffs_ep *ep; |
| 757 | char *data = NULL; |
| 758 | ssize_t ret; |
| 759 | int halt; |
| 760 | |
| 761 | goto first_try; |
| 762 | do { |
| 763 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 764 | mutex_unlock(&epfile->mutex); |
| 765 | |
| 766 | first_try: |
| 767 | /* Are we still active? */ |
| 768 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { |
| 769 | ret = -ENODEV; |
| 770 | goto error; |
| 771 | } |
| 772 | |
| 773 | /* Wait for endpoint to be enabled */ |
| 774 | ep = epfile->ep; |
| 775 | if (!ep) { |
| 776 | if (file->f_flags & O_NONBLOCK) { |
| 777 | ret = -EAGAIN; |
| 778 | goto error; |
| 779 | } |
| 780 | |
| 781 | if (unlikely(wait_event_interruptible |
| 782 | (epfile->wait, (ep = epfile->ep)))) { |
| 783 | ret = -EINTR; |
| 784 | goto error; |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | /* Do we halt? */ |
| 789 | halt = !read == !epfile->in; |
| 790 | if (halt && epfile->isoc) { |
| 791 | ret = -EINVAL; |
| 792 | goto error; |
| 793 | } |
| 794 | |
| 795 | /* Allocate & copy */ |
| 796 | if (!halt && !data) { |
| 797 | data = kzalloc(len, GFP_KERNEL); |
| 798 | if (unlikely(!data)) |
| 799 | return -ENOMEM; |
| 800 | |
| 801 | if (!read && |
| 802 | unlikely(__copy_from_user(data, buf, len))) { |
| 803 | ret = -EFAULT; |
| 804 | goto error; |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | /* We will be using request */ |
| 809 | ret = ffs_mutex_lock(&epfile->mutex, |
| 810 | file->f_flags & O_NONBLOCK); |
| 811 | if (unlikely(ret)) |
| 812 | goto error; |
| 813 | |
| 814 | /* We're called from user space, we can use _irq rather then |
| 815 | * _irqsave */ |
| 816 | spin_lock_irq(&epfile->ffs->eps_lock); |
| 817 | |
| 818 | /* While we were acquiring mutex endpoint got disabled |
| 819 | * or changed? */ |
| 820 | } while (unlikely(epfile->ep != ep)); |
| 821 | |
| 822 | /* Halt */ |
| 823 | if (unlikely(halt)) { |
| 824 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
| 825 | usb_ep_set_halt(ep->ep); |
| 826 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 827 | ret = -EBADMSG; |
| 828 | } else { |
| 829 | /* Fire the request */ |
| 830 | DECLARE_COMPLETION_ONSTACK(done); |
| 831 | |
| 832 | struct usb_request *req = ep->req; |
| 833 | req->context = &done; |
| 834 | req->complete = ffs_epfile_io_complete; |
| 835 | req->buf = data; |
| 836 | req->length = len; |
| 837 | |
| 838 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
| 839 | |
| 840 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 841 | |
| 842 | if (unlikely(ret < 0)) { |
| 843 | /* nop */ |
| 844 | } else if (unlikely(wait_for_completion_interruptible(&done))) { |
| 845 | ret = -EINTR; |
| 846 | usb_ep_dequeue(ep->ep, req); |
| 847 | } else { |
| 848 | ret = ep->status; |
| 849 | if (read && ret > 0 && |
| 850 | unlikely(copy_to_user(buf, data, ret))) |
| 851 | ret = -EFAULT; |
| 852 | } |
| 853 | } |
| 854 | |
| 855 | mutex_unlock(&epfile->mutex); |
| 856 | error: |
| 857 | kfree(data); |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | |
| 862 | static ssize_t |
| 863 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, |
| 864 | loff_t *ptr) |
| 865 | { |
| 866 | ENTER(); |
| 867 | |
| 868 | return ffs_epfile_io(file, (char __user *)buf, len, 0); |
| 869 | } |
| 870 | |
| 871 | static ssize_t |
| 872 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) |
| 873 | { |
| 874 | ENTER(); |
| 875 | |
| 876 | return ffs_epfile_io(file, buf, len, 1); |
| 877 | } |
| 878 | |
| 879 | static int |
| 880 | ffs_epfile_open(struct inode *inode, struct file *file) |
| 881 | { |
| 882 | struct ffs_epfile *epfile = inode->i_private; |
| 883 | |
| 884 | ENTER(); |
| 885 | |
| 886 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
| 887 | return -ENODEV; |
| 888 | |
| 889 | file->private_data = epfile; |
| 890 | ffs_data_opened(epfile->ffs); |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | static int |
| 896 | ffs_epfile_release(struct inode *inode, struct file *file) |
| 897 | { |
| 898 | struct ffs_epfile *epfile = inode->i_private; |
| 899 | |
| 900 | ENTER(); |
| 901 | |
| 902 | ffs_data_closed(epfile->ffs); |
| 903 | |
| 904 | return 0; |
| 905 | } |
| 906 | |
| 907 | |
| 908 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
| 909 | unsigned long value) |
| 910 | { |
| 911 | struct ffs_epfile *epfile = file->private_data; |
| 912 | int ret; |
| 913 | |
| 914 | ENTER(); |
| 915 | |
| 916 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
| 917 | return -ENODEV; |
| 918 | |
| 919 | spin_lock_irq(&epfile->ffs->eps_lock); |
| 920 | if (likely(epfile->ep)) { |
| 921 | switch (code) { |
| 922 | case FUNCTIONFS_FIFO_STATUS: |
| 923 | ret = usb_ep_fifo_status(epfile->ep->ep); |
| 924 | break; |
| 925 | case FUNCTIONFS_FIFO_FLUSH: |
| 926 | usb_ep_fifo_flush(epfile->ep->ep); |
| 927 | ret = 0; |
| 928 | break; |
| 929 | case FUNCTIONFS_CLEAR_HALT: |
| 930 | ret = usb_ep_clear_halt(epfile->ep->ep); |
| 931 | break; |
| 932 | case FUNCTIONFS_ENDPOINT_REVMAP: |
| 933 | ret = epfile->ep->num; |
| 934 | break; |
| 935 | default: |
| 936 | ret = -ENOTTY; |
| 937 | } |
| 938 | } else { |
| 939 | ret = -ENODEV; |
| 940 | } |
| 941 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 942 | |
| 943 | return ret; |
| 944 | } |
| 945 | |
| 946 | |
| 947 | static const struct file_operations ffs_epfile_operations = { |
| 948 | .owner = THIS_MODULE, |
| 949 | .llseek = no_llseek, |
| 950 | |
| 951 | .open = ffs_epfile_open, |
| 952 | .write = ffs_epfile_write, |
| 953 | .read = ffs_epfile_read, |
| 954 | .release = ffs_epfile_release, |
| 955 | .unlocked_ioctl = ffs_epfile_ioctl, |
| 956 | }; |
| 957 | |
| 958 | |
| 959 | |
| 960 | /* File system and super block operations ***********************************/ |
| 961 | |
| 962 | /* |
| 963 | * Mounting the filesystem creates a controller file, used first for |
| 964 | * function configuration then later for event monitoring. |
| 965 | */ |
| 966 | |
| 967 | |
| 968 | static struct inode *__must_check |
| 969 | ffs_sb_make_inode(struct super_block *sb, void *data, |
| 970 | const struct file_operations *fops, |
| 971 | const struct inode_operations *iops, |
| 972 | struct ffs_file_perms *perms) |
| 973 | { |
| 974 | struct inode *inode; |
| 975 | |
| 976 | ENTER(); |
| 977 | |
| 978 | inode = new_inode(sb); |
| 979 | |
| 980 | if (likely(inode)) { |
| 981 | struct timespec current_time = CURRENT_TIME; |
| 982 | |
| 983 | inode->i_mode = perms->mode; |
| 984 | inode->i_uid = perms->uid; |
| 985 | inode->i_gid = perms->gid; |
| 986 | inode->i_atime = current_time; |
| 987 | inode->i_mtime = current_time; |
| 988 | inode->i_ctime = current_time; |
| 989 | inode->i_private = data; |
| 990 | if (fops) |
| 991 | inode->i_fop = fops; |
| 992 | if (iops) |
| 993 | inode->i_op = iops; |
| 994 | } |
| 995 | |
| 996 | return inode; |
| 997 | } |
| 998 | |
| 999 | |
| 1000 | /* Create "regular" file */ |
| 1001 | |
| 1002 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
| 1003 | const char *name, void *data, |
| 1004 | const struct file_operations *fops, |
| 1005 | struct dentry **dentry_p) |
| 1006 | { |
| 1007 | struct ffs_data *ffs = sb->s_fs_info; |
| 1008 | struct dentry *dentry; |
| 1009 | struct inode *inode; |
| 1010 | |
| 1011 | ENTER(); |
| 1012 | |
| 1013 | dentry = d_alloc_name(sb->s_root, name); |
| 1014 | if (unlikely(!dentry)) |
| 1015 | return NULL; |
| 1016 | |
| 1017 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); |
| 1018 | if (unlikely(!inode)) { |
| 1019 | dput(dentry); |
| 1020 | return NULL; |
| 1021 | } |
| 1022 | |
| 1023 | d_add(dentry, inode); |
| 1024 | if (dentry_p) |
| 1025 | *dentry_p = dentry; |
| 1026 | |
| 1027 | return inode; |
| 1028 | } |
| 1029 | |
| 1030 | |
| 1031 | /* Super block */ |
| 1032 | |
| 1033 | static const struct super_operations ffs_sb_operations = { |
| 1034 | .statfs = simple_statfs, |
| 1035 | .drop_inode = generic_delete_inode, |
| 1036 | }; |
| 1037 | |
| 1038 | struct ffs_sb_fill_data { |
| 1039 | struct ffs_file_perms perms; |
| 1040 | umode_t root_mode; |
| 1041 | const char *dev_name; |
| 1042 | }; |
| 1043 | |
| 1044 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) |
| 1045 | { |
| 1046 | struct ffs_sb_fill_data *data = _data; |
| 1047 | struct inode *inode; |
| 1048 | struct dentry *d; |
| 1049 | struct ffs_data *ffs; |
| 1050 | |
| 1051 | ENTER(); |
| 1052 | |
| 1053 | /* Initialize data */ |
| 1054 | ffs = ffs_data_new(); |
| 1055 | if (unlikely(!ffs)) |
| 1056 | goto enomem0; |
| 1057 | |
| 1058 | ffs->sb = sb; |
| 1059 | ffs->dev_name = data->dev_name; |
| 1060 | ffs->file_perms = data->perms; |
| 1061 | |
| 1062 | sb->s_fs_info = ffs; |
| 1063 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 1064 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 1065 | sb->s_magic = FUNCTIONFS_MAGIC; |
| 1066 | sb->s_op = &ffs_sb_operations; |
| 1067 | sb->s_time_gran = 1; |
| 1068 | |
| 1069 | /* Root inode */ |
| 1070 | data->perms.mode = data->root_mode; |
| 1071 | inode = ffs_sb_make_inode(sb, NULL, |
| 1072 | &simple_dir_operations, |
| 1073 | &simple_dir_inode_operations, |
| 1074 | &data->perms); |
| 1075 | if (unlikely(!inode)) |
| 1076 | goto enomem1; |
| 1077 | d = d_alloc_root(inode); |
| 1078 | if (unlikely(!d)) |
| 1079 | goto enomem2; |
| 1080 | sb->s_root = d; |
| 1081 | |
| 1082 | /* EP0 file */ |
| 1083 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, |
| 1084 | &ffs_ep0_operations, NULL))) |
| 1085 | goto enomem3; |
| 1086 | |
| 1087 | return 0; |
| 1088 | |
| 1089 | enomem3: |
| 1090 | dput(d); |
| 1091 | enomem2: |
| 1092 | iput(inode); |
| 1093 | enomem1: |
| 1094 | ffs_data_put(ffs); |
| 1095 | enomem0: |
| 1096 | return -ENOMEM; |
| 1097 | } |
| 1098 | |
| 1099 | |
| 1100 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
| 1101 | { |
| 1102 | ENTER(); |
| 1103 | |
| 1104 | if (!opts || !*opts) |
| 1105 | return 0; |
| 1106 | |
| 1107 | for (;;) { |
| 1108 | char *end, *eq, *comma; |
| 1109 | unsigned long value; |
| 1110 | |
| 1111 | /* Option limit */ |
| 1112 | comma = strchr(opts, ','); |
| 1113 | if (comma) |
| 1114 | *comma = 0; |
| 1115 | |
| 1116 | /* Value limit */ |
| 1117 | eq = strchr(opts, '='); |
| 1118 | if (unlikely(!eq)) { |
| 1119 | FERR("'=' missing in %s", opts); |
| 1120 | return -EINVAL; |
| 1121 | } |
| 1122 | *eq = 0; |
| 1123 | |
| 1124 | /* Parse value */ |
| 1125 | value = simple_strtoul(eq + 1, &end, 0); |
| 1126 | if (unlikely(*end != ',' && *end != 0)) { |
| 1127 | FERR("%s: invalid value: %s", opts, eq + 1); |
| 1128 | return -EINVAL; |
| 1129 | } |
| 1130 | |
| 1131 | /* Interpret option */ |
| 1132 | switch (eq - opts) { |
| 1133 | case 5: |
| 1134 | if (!memcmp(opts, "rmode", 5)) |
| 1135 | data->root_mode = (value & 0555) | S_IFDIR; |
| 1136 | else if (!memcmp(opts, "fmode", 5)) |
| 1137 | data->perms.mode = (value & 0666) | S_IFREG; |
| 1138 | else |
| 1139 | goto invalid; |
| 1140 | break; |
| 1141 | |
| 1142 | case 4: |
| 1143 | if (!memcmp(opts, "mode", 4)) { |
| 1144 | data->root_mode = (value & 0555) | S_IFDIR; |
| 1145 | data->perms.mode = (value & 0666) | S_IFREG; |
| 1146 | } else { |
| 1147 | goto invalid; |
| 1148 | } |
| 1149 | break; |
| 1150 | |
| 1151 | case 3: |
| 1152 | if (!memcmp(opts, "uid", 3)) |
| 1153 | data->perms.uid = value; |
| 1154 | else if (!memcmp(opts, "gid", 3)) |
| 1155 | data->perms.gid = value; |
| 1156 | else |
| 1157 | goto invalid; |
| 1158 | break; |
| 1159 | |
| 1160 | default: |
| 1161 | invalid: |
| 1162 | FERR("%s: invalid option", opts); |
| 1163 | return -EINVAL; |
| 1164 | } |
| 1165 | |
| 1166 | /* Next iteration */ |
| 1167 | if (!comma) |
| 1168 | break; |
| 1169 | opts = comma + 1; |
| 1170 | } |
| 1171 | |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | |
| 1176 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
| 1177 | |
| 1178 | static int |
| 1179 | ffs_fs_get_sb(struct file_system_type *t, int flags, |
| 1180 | const char *dev_name, void *opts, struct vfsmount *mnt) |
| 1181 | { |
| 1182 | struct ffs_sb_fill_data data = { |
| 1183 | .perms = { |
| 1184 | .mode = S_IFREG | 0600, |
| 1185 | .uid = 0, |
| 1186 | .gid = 0 |
| 1187 | }, |
| 1188 | .root_mode = S_IFDIR | 0500, |
| 1189 | }; |
| 1190 | int ret; |
| 1191 | |
| 1192 | ENTER(); |
| 1193 | |
| 1194 | ret = functionfs_check_dev_callback(dev_name); |
| 1195 | if (unlikely(ret < 0)) |
| 1196 | return ret; |
| 1197 | |
| 1198 | ret = ffs_fs_parse_opts(&data, opts); |
| 1199 | if (unlikely(ret < 0)) |
| 1200 | return ret; |
| 1201 | |
| 1202 | data.dev_name = dev_name; |
| 1203 | return get_sb_single(t, flags, &data, ffs_sb_fill, mnt); |
| 1204 | } |
| 1205 | |
| 1206 | static void |
| 1207 | ffs_fs_kill_sb(struct super_block *sb) |
| 1208 | { |
| 1209 | void *ptr; |
| 1210 | |
| 1211 | ENTER(); |
| 1212 | |
| 1213 | kill_litter_super(sb); |
| 1214 | ptr = xchg(&sb->s_fs_info, NULL); |
| 1215 | if (ptr) |
| 1216 | ffs_data_put(ptr); |
| 1217 | } |
| 1218 | |
| 1219 | static struct file_system_type ffs_fs_type = { |
| 1220 | .owner = THIS_MODULE, |
| 1221 | .name = "functionfs", |
| 1222 | .get_sb = ffs_fs_get_sb, |
| 1223 | .kill_sb = ffs_fs_kill_sb, |
| 1224 | }; |
| 1225 | |
| 1226 | |
| 1227 | |
| 1228 | /* Driver's main init/cleanup functions *************************************/ |
| 1229 | |
| 1230 | |
| 1231 | static int functionfs_init(void) |
| 1232 | { |
| 1233 | int ret; |
| 1234 | |
| 1235 | ENTER(); |
| 1236 | |
| 1237 | ret = register_filesystem(&ffs_fs_type); |
| 1238 | if (likely(!ret)) |
| 1239 | FINFO("file system registered"); |
| 1240 | else |
| 1241 | FERR("failed registering file system (%d)", ret); |
| 1242 | |
| 1243 | return ret; |
| 1244 | } |
| 1245 | |
| 1246 | static void functionfs_cleanup(void) |
| 1247 | { |
| 1248 | ENTER(); |
| 1249 | |
| 1250 | FINFO("unloading"); |
| 1251 | unregister_filesystem(&ffs_fs_type); |
| 1252 | } |
| 1253 | |
| 1254 | |
| 1255 | |
| 1256 | /* ffs_data and ffs_function construction and destruction code **************/ |
| 1257 | |
| 1258 | static void ffs_data_clear(struct ffs_data *ffs); |
| 1259 | static void ffs_data_reset(struct ffs_data *ffs); |
| 1260 | |
| 1261 | |
| 1262 | static void ffs_data_get(struct ffs_data *ffs) |
| 1263 | { |
| 1264 | ENTER(); |
| 1265 | |
| 1266 | atomic_inc(&ffs->ref); |
| 1267 | } |
| 1268 | |
| 1269 | static void ffs_data_opened(struct ffs_data *ffs) |
| 1270 | { |
| 1271 | ENTER(); |
| 1272 | |
| 1273 | atomic_inc(&ffs->ref); |
| 1274 | atomic_inc(&ffs->opened); |
| 1275 | } |
| 1276 | |
| 1277 | static void ffs_data_put(struct ffs_data *ffs) |
| 1278 | { |
| 1279 | ENTER(); |
| 1280 | |
| 1281 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { |
| 1282 | FINFO("%s(): freeing", __func__); |
| 1283 | ffs_data_clear(ffs); |
| 1284 | BUG_ON(mutex_is_locked(&ffs->mutex) || |
| 1285 | spin_is_locked(&ffs->ev.waitq.lock) || |
| 1286 | waitqueue_active(&ffs->ev.waitq) || |
| 1287 | waitqueue_active(&ffs->ep0req_completion.wait)); |
| 1288 | kfree(ffs); |
| 1289 | } |
| 1290 | } |
| 1291 | |
| 1292 | |
| 1293 | |
| 1294 | static void ffs_data_closed(struct ffs_data *ffs) |
| 1295 | { |
| 1296 | ENTER(); |
| 1297 | |
| 1298 | if (atomic_dec_and_test(&ffs->opened)) { |
| 1299 | ffs->state = FFS_CLOSING; |
| 1300 | ffs_data_reset(ffs); |
| 1301 | } |
| 1302 | |
| 1303 | ffs_data_put(ffs); |
| 1304 | } |
| 1305 | |
| 1306 | |
| 1307 | static struct ffs_data *ffs_data_new(void) |
| 1308 | { |
| 1309 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); |
| 1310 | if (unlikely(!ffs)) |
| 1311 | return 0; |
| 1312 | |
| 1313 | ENTER(); |
| 1314 | |
| 1315 | atomic_set(&ffs->ref, 1); |
| 1316 | atomic_set(&ffs->opened, 0); |
| 1317 | ffs->state = FFS_READ_DESCRIPTORS; |
| 1318 | mutex_init(&ffs->mutex); |
| 1319 | spin_lock_init(&ffs->eps_lock); |
| 1320 | init_waitqueue_head(&ffs->ev.waitq); |
| 1321 | init_completion(&ffs->ep0req_completion); |
| 1322 | |
| 1323 | /* XXX REVISIT need to update it in some places, or do we? */ |
| 1324 | ffs->ev.can_stall = 1; |
| 1325 | |
| 1326 | return ffs; |
| 1327 | } |
| 1328 | |
| 1329 | |
| 1330 | static void ffs_data_clear(struct ffs_data *ffs) |
| 1331 | { |
| 1332 | ENTER(); |
| 1333 | |
| 1334 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) |
| 1335 | functionfs_closed_callback(ffs); |
| 1336 | |
| 1337 | BUG_ON(ffs->gadget); |
| 1338 | |
| 1339 | if (ffs->epfiles) |
| 1340 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); |
| 1341 | |
| 1342 | kfree(ffs->raw_descs); |
| 1343 | kfree(ffs->raw_strings); |
| 1344 | kfree(ffs->stringtabs); |
| 1345 | } |
| 1346 | |
| 1347 | |
| 1348 | static void ffs_data_reset(struct ffs_data *ffs) |
| 1349 | { |
| 1350 | ENTER(); |
| 1351 | |
| 1352 | ffs_data_clear(ffs); |
| 1353 | |
| 1354 | ffs->epfiles = NULL; |
| 1355 | ffs->raw_descs = NULL; |
| 1356 | ffs->raw_strings = NULL; |
| 1357 | ffs->stringtabs = NULL; |
| 1358 | |
| 1359 | ffs->raw_descs_length = 0; |
| 1360 | ffs->raw_fs_descs_length = 0; |
| 1361 | ffs->fs_descs_count = 0; |
| 1362 | ffs->hs_descs_count = 0; |
| 1363 | |
| 1364 | ffs->strings_count = 0; |
| 1365 | ffs->interfaces_count = 0; |
| 1366 | ffs->eps_count = 0; |
| 1367 | |
| 1368 | ffs->ev.count = 0; |
| 1369 | |
| 1370 | ffs->state = FFS_READ_DESCRIPTORS; |
| 1371 | ffs->setup_state = FFS_NO_SETUP; |
| 1372 | ffs->flags = 0; |
| 1373 | } |
| 1374 | |
| 1375 | |
| 1376 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) |
| 1377 | { |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1378 | struct usb_gadget_strings **lang; |
| 1379 | int first_id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1380 | |
| 1381 | ENTER(); |
| 1382 | |
| 1383 | if (WARN_ON(ffs->state != FFS_ACTIVE |
| 1384 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) |
| 1385 | return -EBADFD; |
| 1386 | |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1387 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
| 1388 | if (unlikely(first_id < 0)) |
| 1389 | return first_id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1390 | |
| 1391 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); |
| 1392 | if (unlikely(!ffs->ep0req)) |
| 1393 | return -ENOMEM; |
| 1394 | ffs->ep0req->complete = ffs_ep0_complete; |
| 1395 | ffs->ep0req->context = ffs; |
| 1396 | |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1397 | lang = ffs->stringtabs; |
| 1398 | for (lang = ffs->stringtabs; *lang; ++lang) { |
| 1399 | struct usb_string *str = (*lang)->strings; |
| 1400 | int id = first_id; |
| 1401 | for (; str->s; ++id, ++str) |
| 1402 | str->id = id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1403 | } |
| 1404 | |
| 1405 | ffs->gadget = cdev->gadget; |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1406 | ffs_data_get(ffs); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1407 | return 0; |
| 1408 | } |
| 1409 | |
| 1410 | |
| 1411 | static void functionfs_unbind(struct ffs_data *ffs) |
| 1412 | { |
| 1413 | ENTER(); |
| 1414 | |
| 1415 | if (!WARN_ON(!ffs->gadget)) { |
| 1416 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); |
| 1417 | ffs->ep0req = NULL; |
| 1418 | ffs->gadget = NULL; |
| 1419 | ffs_data_put(ffs); |
| 1420 | } |
| 1421 | } |
| 1422 | |
| 1423 | |
| 1424 | static int ffs_epfiles_create(struct ffs_data *ffs) |
| 1425 | { |
| 1426 | struct ffs_epfile *epfile, *epfiles; |
| 1427 | unsigned i, count; |
| 1428 | |
| 1429 | ENTER(); |
| 1430 | |
| 1431 | count = ffs->eps_count; |
| 1432 | epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL); |
| 1433 | if (!epfiles) |
| 1434 | return -ENOMEM; |
| 1435 | |
| 1436 | epfile = epfiles; |
| 1437 | for (i = 1; i <= count; ++i, ++epfile) { |
| 1438 | epfile->ffs = ffs; |
| 1439 | mutex_init(&epfile->mutex); |
| 1440 | init_waitqueue_head(&epfile->wait); |
| 1441 | sprintf(epfiles->name, "ep%u", i); |
| 1442 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, |
| 1443 | &ffs_epfile_operations, |
| 1444 | &epfile->dentry))) { |
| 1445 | ffs_epfiles_destroy(epfiles, i - 1); |
| 1446 | return -ENOMEM; |
| 1447 | } |
| 1448 | } |
| 1449 | |
| 1450 | ffs->epfiles = epfiles; |
| 1451 | return 0; |
| 1452 | } |
| 1453 | |
| 1454 | |
| 1455 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
| 1456 | { |
| 1457 | struct ffs_epfile *epfile = epfiles; |
| 1458 | |
| 1459 | ENTER(); |
| 1460 | |
| 1461 | for (; count; --count, ++epfile) { |
| 1462 | BUG_ON(mutex_is_locked(&epfile->mutex) || |
| 1463 | waitqueue_active(&epfile->wait)); |
| 1464 | if (epfile->dentry) { |
| 1465 | d_delete(epfile->dentry); |
| 1466 | dput(epfile->dentry); |
| 1467 | epfile->dentry = NULL; |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | kfree(epfiles); |
| 1472 | } |
| 1473 | |
| 1474 | |
Michal Nazarewicz | 7898aee | 2010-06-16 12:07:58 +0200 | [diff] [blame] | 1475 | static int functionfs_bind_config(struct usb_composite_dev *cdev, |
| 1476 | struct usb_configuration *c, |
| 1477 | struct ffs_data *ffs) |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1478 | { |
| 1479 | struct ffs_function *func; |
| 1480 | int ret; |
| 1481 | |
| 1482 | ENTER(); |
| 1483 | |
| 1484 | func = kzalloc(sizeof *func, GFP_KERNEL); |
| 1485 | if (unlikely(!func)) |
| 1486 | return -ENOMEM; |
| 1487 | |
| 1488 | func->function.name = "Function FS Gadget"; |
| 1489 | func->function.strings = ffs->stringtabs; |
| 1490 | |
| 1491 | func->function.bind = ffs_func_bind; |
| 1492 | func->function.unbind = ffs_func_unbind; |
| 1493 | func->function.set_alt = ffs_func_set_alt; |
| 1494 | /*func->function.get_alt = ffs_func_get_alt;*/ |
| 1495 | func->function.disable = ffs_func_disable; |
| 1496 | func->function.setup = ffs_func_setup; |
| 1497 | func->function.suspend = ffs_func_suspend; |
| 1498 | func->function.resume = ffs_func_resume; |
| 1499 | |
| 1500 | func->conf = c; |
| 1501 | func->gadget = cdev->gadget; |
| 1502 | func->ffs = ffs; |
| 1503 | ffs_data_get(ffs); |
| 1504 | |
| 1505 | ret = usb_add_function(c, &func->function); |
| 1506 | if (unlikely(ret)) |
| 1507 | ffs_func_free(func); |
| 1508 | |
| 1509 | return ret; |
| 1510 | } |
| 1511 | |
| 1512 | static void ffs_func_free(struct ffs_function *func) |
| 1513 | { |
| 1514 | ENTER(); |
| 1515 | |
| 1516 | ffs_data_put(func->ffs); |
| 1517 | |
| 1518 | kfree(func->eps); |
| 1519 | /* eps and interfaces_nums are allocated in the same chunk so |
| 1520 | * only one free is required. Descriptors are also allocated |
| 1521 | * in the same chunk. */ |
| 1522 | |
| 1523 | kfree(func); |
| 1524 | } |
| 1525 | |
| 1526 | |
| 1527 | static void ffs_func_eps_disable(struct ffs_function *func) |
| 1528 | { |
| 1529 | struct ffs_ep *ep = func->eps; |
| 1530 | struct ffs_epfile *epfile = func->ffs->epfiles; |
| 1531 | unsigned count = func->ffs->eps_count; |
| 1532 | unsigned long flags; |
| 1533 | |
| 1534 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
| 1535 | do { |
| 1536 | /* pending requests get nuked */ |
| 1537 | if (likely(ep->ep)) |
| 1538 | usb_ep_disable(ep->ep); |
| 1539 | epfile->ep = NULL; |
| 1540 | |
| 1541 | ++ep; |
| 1542 | ++epfile; |
| 1543 | } while (--count); |
| 1544 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
| 1545 | } |
| 1546 | |
| 1547 | static int ffs_func_eps_enable(struct ffs_function *func) |
| 1548 | { |
| 1549 | struct ffs_data *ffs = func->ffs; |
| 1550 | struct ffs_ep *ep = func->eps; |
| 1551 | struct ffs_epfile *epfile = ffs->epfiles; |
| 1552 | unsigned count = ffs->eps_count; |
| 1553 | unsigned long flags; |
| 1554 | int ret = 0; |
| 1555 | |
| 1556 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
| 1557 | do { |
| 1558 | struct usb_endpoint_descriptor *ds; |
| 1559 | ds = ep->descs[ep->descs[1] ? 1 : 0]; |
| 1560 | |
| 1561 | ep->ep->driver_data = ep; |
| 1562 | ret = usb_ep_enable(ep->ep, ds); |
| 1563 | if (likely(!ret)) { |
| 1564 | epfile->ep = ep; |
| 1565 | epfile->in = usb_endpoint_dir_in(ds); |
| 1566 | epfile->isoc = usb_endpoint_xfer_isoc(ds); |
| 1567 | } else { |
| 1568 | break; |
| 1569 | } |
| 1570 | |
| 1571 | wake_up(&epfile->wait); |
| 1572 | |
| 1573 | ++ep; |
| 1574 | ++epfile; |
| 1575 | } while (--count); |
| 1576 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
| 1577 | |
| 1578 | return ret; |
| 1579 | } |
| 1580 | |
| 1581 | |
| 1582 | /* Parsing and building descriptors and strings *****************************/ |
| 1583 | |
| 1584 | |
| 1585 | /* This validates if data pointed by data is a valid USB descriptor as |
| 1586 | * well as record how many interfaces, endpoints and strings are |
| 1587 | * required by given configuration. Returns address afther the |
| 1588 | * descriptor or NULL if data is invalid. */ |
| 1589 | |
| 1590 | enum ffs_entity_type { |
| 1591 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT |
| 1592 | }; |
| 1593 | |
| 1594 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
| 1595 | u8 *valuep, |
| 1596 | struct usb_descriptor_header *desc, |
| 1597 | void *priv); |
| 1598 | |
| 1599 | static int __must_check ffs_do_desc(char *data, unsigned len, |
| 1600 | ffs_entity_callback entity, void *priv) |
| 1601 | { |
| 1602 | struct usb_descriptor_header *_ds = (void *)data; |
| 1603 | u8 length; |
| 1604 | int ret; |
| 1605 | |
| 1606 | ENTER(); |
| 1607 | |
| 1608 | /* At least two bytes are required: length and type */ |
| 1609 | if (len < 2) { |
| 1610 | FVDBG("descriptor too short"); |
| 1611 | return -EINVAL; |
| 1612 | } |
| 1613 | |
| 1614 | /* If we have at least as many bytes as the descriptor takes? */ |
| 1615 | length = _ds->bLength; |
| 1616 | if (len < length) { |
| 1617 | FVDBG("descriptor longer then available data"); |
| 1618 | return -EINVAL; |
| 1619 | } |
| 1620 | |
| 1621 | #define __entity_check_INTERFACE(val) 1 |
| 1622 | #define __entity_check_STRING(val) (val) |
| 1623 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) |
| 1624 | #define __entity(type, val) do { \ |
| 1625 | FVDBG("entity " #type "(%02x)", (val)); \ |
| 1626 | if (unlikely(!__entity_check_ ##type(val))) { \ |
| 1627 | FVDBG("invalid entity's value"); \ |
| 1628 | return -EINVAL; \ |
| 1629 | } \ |
| 1630 | ret = entity(FFS_ ##type, &val, _ds, priv); \ |
| 1631 | if (unlikely(ret < 0)) { \ |
| 1632 | FDBG("entity " #type "(%02x); ret = %d", \ |
| 1633 | (val), ret); \ |
| 1634 | return ret; \ |
| 1635 | } \ |
| 1636 | } while (0) |
| 1637 | |
| 1638 | /* Parse descriptor depending on type. */ |
| 1639 | switch (_ds->bDescriptorType) { |
| 1640 | case USB_DT_DEVICE: |
| 1641 | case USB_DT_CONFIG: |
| 1642 | case USB_DT_STRING: |
| 1643 | case USB_DT_DEVICE_QUALIFIER: |
| 1644 | /* function can't have any of those */ |
| 1645 | FVDBG("descriptor reserved for gadget: %d", _ds->bDescriptorType); |
| 1646 | return -EINVAL; |
| 1647 | |
| 1648 | case USB_DT_INTERFACE: { |
| 1649 | struct usb_interface_descriptor *ds = (void *)_ds; |
| 1650 | FVDBG("interface descriptor"); |
| 1651 | if (length != sizeof *ds) |
| 1652 | goto inv_length; |
| 1653 | |
| 1654 | __entity(INTERFACE, ds->bInterfaceNumber); |
| 1655 | if (ds->iInterface) |
| 1656 | __entity(STRING, ds->iInterface); |
| 1657 | } |
| 1658 | break; |
| 1659 | |
| 1660 | case USB_DT_ENDPOINT: { |
| 1661 | struct usb_endpoint_descriptor *ds = (void *)_ds; |
| 1662 | FVDBG("endpoint descriptor"); |
| 1663 | if (length != USB_DT_ENDPOINT_SIZE && |
| 1664 | length != USB_DT_ENDPOINT_AUDIO_SIZE) |
| 1665 | goto inv_length; |
| 1666 | __entity(ENDPOINT, ds->bEndpointAddress); |
| 1667 | } |
| 1668 | break; |
| 1669 | |
| 1670 | case USB_DT_OTG: |
| 1671 | if (length != sizeof(struct usb_otg_descriptor)) |
| 1672 | goto inv_length; |
| 1673 | break; |
| 1674 | |
| 1675 | case USB_DT_INTERFACE_ASSOCIATION: { |
| 1676 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; |
| 1677 | FVDBG("interface association descriptor"); |
| 1678 | if (length != sizeof *ds) |
| 1679 | goto inv_length; |
| 1680 | if (ds->iFunction) |
| 1681 | __entity(STRING, ds->iFunction); |
| 1682 | } |
| 1683 | break; |
| 1684 | |
| 1685 | case USB_DT_OTHER_SPEED_CONFIG: |
| 1686 | case USB_DT_INTERFACE_POWER: |
| 1687 | case USB_DT_DEBUG: |
| 1688 | case USB_DT_SECURITY: |
| 1689 | case USB_DT_CS_RADIO_CONTROL: |
| 1690 | /* TODO */ |
| 1691 | FVDBG("unimplemented descriptor: %d", _ds->bDescriptorType); |
| 1692 | return -EINVAL; |
| 1693 | |
| 1694 | default: |
| 1695 | /* We should never be here */ |
| 1696 | FVDBG("unknown descriptor: %d", _ds->bDescriptorType); |
| 1697 | return -EINVAL; |
| 1698 | |
| 1699 | inv_length: |
| 1700 | FVDBG("invalid length: %d (descriptor %d)", |
| 1701 | _ds->bLength, _ds->bDescriptorType); |
| 1702 | return -EINVAL; |
| 1703 | } |
| 1704 | |
| 1705 | #undef __entity |
| 1706 | #undef __entity_check_DESCRIPTOR |
| 1707 | #undef __entity_check_INTERFACE |
| 1708 | #undef __entity_check_STRING |
| 1709 | #undef __entity_check_ENDPOINT |
| 1710 | |
| 1711 | return length; |
| 1712 | } |
| 1713 | |
| 1714 | |
| 1715 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
| 1716 | ffs_entity_callback entity, void *priv) |
| 1717 | { |
| 1718 | const unsigned _len = len; |
| 1719 | unsigned long num = 0; |
| 1720 | |
| 1721 | ENTER(); |
| 1722 | |
| 1723 | for (;;) { |
| 1724 | int ret; |
| 1725 | |
| 1726 | if (num == count) |
| 1727 | data = NULL; |
| 1728 | |
| 1729 | /* Record "descriptor" entitny */ |
| 1730 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
| 1731 | if (unlikely(ret < 0)) { |
| 1732 | FDBG("entity DESCRIPTOR(%02lx); ret = %d", num, ret); |
| 1733 | return ret; |
| 1734 | } |
| 1735 | |
| 1736 | if (!data) |
| 1737 | return _len - len; |
| 1738 | |
| 1739 | ret = ffs_do_desc(data, len, entity, priv); |
| 1740 | if (unlikely(ret < 0)) { |
| 1741 | FDBG("%s returns %d", __func__, ret); |
| 1742 | return ret; |
| 1743 | } |
| 1744 | |
| 1745 | len -= ret; |
| 1746 | data += ret; |
| 1747 | ++num; |
| 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | |
| 1752 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
| 1753 | u8 *valuep, struct usb_descriptor_header *desc, |
| 1754 | void *priv) |
| 1755 | { |
| 1756 | struct ffs_data *ffs = priv; |
| 1757 | |
| 1758 | ENTER(); |
| 1759 | |
| 1760 | switch (type) { |
| 1761 | case FFS_DESCRIPTOR: |
| 1762 | break; |
| 1763 | |
| 1764 | case FFS_INTERFACE: |
| 1765 | /* Interfaces are indexed from zero so if we |
| 1766 | * encountered interface "n" then there are at least |
| 1767 | * "n+1" interfaces. */ |
| 1768 | if (*valuep >= ffs->interfaces_count) |
| 1769 | ffs->interfaces_count = *valuep + 1; |
| 1770 | break; |
| 1771 | |
| 1772 | case FFS_STRING: |
| 1773 | /* Strings are indexed from 1 (0 is magic ;) reserved |
| 1774 | * for languages list or some such) */ |
| 1775 | if (*valuep > ffs->strings_count) |
| 1776 | ffs->strings_count = *valuep; |
| 1777 | break; |
| 1778 | |
| 1779 | case FFS_ENDPOINT: |
| 1780 | /* Endpoints are indexed from 1 as well. */ |
| 1781 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) |
| 1782 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); |
| 1783 | break; |
| 1784 | } |
| 1785 | |
| 1786 | return 0; |
| 1787 | } |
| 1788 | |
| 1789 | |
| 1790 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
| 1791 | char *const _data, size_t len) |
| 1792 | { |
| 1793 | unsigned fs_count, hs_count; |
| 1794 | int fs_len, ret = -EINVAL; |
| 1795 | char *data = _data; |
| 1796 | |
| 1797 | ENTER(); |
| 1798 | |
| 1799 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC || |
| 1800 | get_unaligned_le32(data + 4) != len)) |
| 1801 | goto error; |
| 1802 | fs_count = get_unaligned_le32(data + 8); |
| 1803 | hs_count = get_unaligned_le32(data + 12); |
| 1804 | |
| 1805 | if (!fs_count && !hs_count) |
| 1806 | goto einval; |
| 1807 | |
| 1808 | data += 16; |
| 1809 | len -= 16; |
| 1810 | |
| 1811 | if (likely(fs_count)) { |
| 1812 | fs_len = ffs_do_descs(fs_count, data, len, |
| 1813 | __ffs_data_do_entity, ffs); |
| 1814 | if (unlikely(fs_len < 0)) { |
| 1815 | ret = fs_len; |
| 1816 | goto error; |
| 1817 | } |
| 1818 | |
| 1819 | data += fs_len; |
| 1820 | len -= fs_len; |
| 1821 | } else { |
| 1822 | fs_len = 0; |
| 1823 | } |
| 1824 | |
| 1825 | if (likely(hs_count)) { |
| 1826 | ret = ffs_do_descs(hs_count, data, len, |
| 1827 | __ffs_data_do_entity, ffs); |
| 1828 | if (unlikely(ret < 0)) |
| 1829 | goto error; |
| 1830 | } else { |
| 1831 | ret = 0; |
| 1832 | } |
| 1833 | |
| 1834 | if (unlikely(len != ret)) |
| 1835 | goto einval; |
| 1836 | |
| 1837 | ffs->raw_fs_descs_length = fs_len; |
| 1838 | ffs->raw_descs_length = fs_len + ret; |
| 1839 | ffs->raw_descs = _data; |
| 1840 | ffs->fs_descs_count = fs_count; |
| 1841 | ffs->hs_descs_count = hs_count; |
| 1842 | |
| 1843 | return 0; |
| 1844 | |
| 1845 | einval: |
| 1846 | ret = -EINVAL; |
| 1847 | error: |
| 1848 | kfree(_data); |
| 1849 | return ret; |
| 1850 | } |
| 1851 | |
| 1852 | |
| 1853 | |
| 1854 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
| 1855 | char *const _data, size_t len) |
| 1856 | { |
| 1857 | u32 str_count, needed_count, lang_count; |
| 1858 | struct usb_gadget_strings **stringtabs, *t; |
| 1859 | struct usb_string *strings, *s; |
| 1860 | const char *data = _data; |
| 1861 | |
| 1862 | ENTER(); |
| 1863 | |
| 1864 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || |
| 1865 | get_unaligned_le32(data + 4) != len)) |
| 1866 | goto error; |
| 1867 | str_count = get_unaligned_le32(data + 8); |
| 1868 | lang_count = get_unaligned_le32(data + 12); |
| 1869 | |
| 1870 | /* if one is zero the other must be zero */ |
| 1871 | if (unlikely(!str_count != !lang_count)) |
| 1872 | goto error; |
| 1873 | |
| 1874 | /* Do we have at least as many strings as descriptors need? */ |
| 1875 | needed_count = ffs->strings_count; |
| 1876 | if (unlikely(str_count < needed_count)) |
| 1877 | goto error; |
| 1878 | |
| 1879 | /* If we don't need any strings just return and free all |
| 1880 | * memory */ |
| 1881 | if (!needed_count) { |
| 1882 | kfree(_data); |
| 1883 | return 0; |
| 1884 | } |
| 1885 | |
| 1886 | /* Allocate */ |
| 1887 | { |
| 1888 | /* Allocate everything in one chunk so there's less |
| 1889 | * maintanance. */ |
| 1890 | struct { |
| 1891 | struct usb_gadget_strings *stringtabs[lang_count + 1]; |
| 1892 | struct usb_gadget_strings stringtab[lang_count]; |
| 1893 | struct usb_string strings[lang_count*(needed_count+1)]; |
| 1894 | } *d; |
| 1895 | unsigned i = 0; |
| 1896 | |
| 1897 | d = kmalloc(sizeof *d, GFP_KERNEL); |
| 1898 | if (unlikely(!d)) { |
| 1899 | kfree(_data); |
| 1900 | return -ENOMEM; |
| 1901 | } |
| 1902 | |
| 1903 | stringtabs = d->stringtabs; |
| 1904 | t = d->stringtab; |
| 1905 | i = lang_count; |
| 1906 | do { |
| 1907 | *stringtabs++ = t++; |
| 1908 | } while (--i); |
| 1909 | *stringtabs = NULL; |
| 1910 | |
| 1911 | stringtabs = d->stringtabs; |
| 1912 | t = d->stringtab; |
| 1913 | s = d->strings; |
| 1914 | strings = s; |
| 1915 | } |
| 1916 | |
| 1917 | /* For each language */ |
| 1918 | data += 16; |
| 1919 | len -= 16; |
| 1920 | |
| 1921 | do { /* lang_count > 0 so we can use do-while */ |
| 1922 | unsigned needed = needed_count; |
| 1923 | |
| 1924 | if (unlikely(len < 3)) |
| 1925 | goto error_free; |
| 1926 | t->language = get_unaligned_le16(data); |
| 1927 | t->strings = s; |
| 1928 | ++t; |
| 1929 | |
| 1930 | data += 2; |
| 1931 | len -= 2; |
| 1932 | |
| 1933 | /* For each string */ |
| 1934 | do { /* str_count > 0 so we can use do-while */ |
| 1935 | size_t length = strnlen(data, len); |
| 1936 | |
| 1937 | if (unlikely(length == len)) |
| 1938 | goto error_free; |
| 1939 | |
| 1940 | /* user may provide more strings then we need, |
| 1941 | * if that's the case we simply ingore the |
| 1942 | * rest */ |
| 1943 | if (likely(needed)) { |
| 1944 | /* s->id will be set while adding |
| 1945 | * function to configuration so for |
| 1946 | * now just leave garbage here. */ |
| 1947 | s->s = data; |
| 1948 | --needed; |
| 1949 | ++s; |
| 1950 | } |
| 1951 | |
| 1952 | data += length + 1; |
| 1953 | len -= length + 1; |
| 1954 | } while (--str_count); |
| 1955 | |
| 1956 | s->id = 0; /* terminator */ |
| 1957 | s->s = NULL; |
| 1958 | ++s; |
| 1959 | |
| 1960 | } while (--lang_count); |
| 1961 | |
| 1962 | /* Some garbage left? */ |
| 1963 | if (unlikely(len)) |
| 1964 | goto error_free; |
| 1965 | |
| 1966 | /* Done! */ |
| 1967 | ffs->stringtabs = stringtabs; |
| 1968 | ffs->raw_strings = _data; |
| 1969 | |
| 1970 | return 0; |
| 1971 | |
| 1972 | error_free: |
| 1973 | kfree(stringtabs); |
| 1974 | error: |
| 1975 | kfree(_data); |
| 1976 | return -EINVAL; |
| 1977 | } |
| 1978 | |
| 1979 | |
| 1980 | |
| 1981 | |
| 1982 | /* Events handling and management *******************************************/ |
| 1983 | |
| 1984 | static void __ffs_event_add(struct ffs_data *ffs, |
| 1985 | enum usb_functionfs_event_type type) |
| 1986 | { |
| 1987 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; |
| 1988 | int neg = 0; |
| 1989 | |
| 1990 | /* Abort any unhandled setup */ |
| 1991 | /* We do not need to worry about some cmpxchg() changing value |
| 1992 | * of ffs->setup_state without holding the lock because when |
| 1993 | * state is FFS_SETUP_PENDING cmpxchg() in several places in |
| 1994 | * the source does nothing. */ |
| 1995 | if (ffs->setup_state == FFS_SETUP_PENDING) |
| 1996 | ffs->setup_state = FFS_SETUP_CANCELED; |
| 1997 | |
| 1998 | switch (type) { |
| 1999 | case FUNCTIONFS_RESUME: |
| 2000 | rem_type2 = FUNCTIONFS_SUSPEND; |
| 2001 | /* FALL THGOUTH */ |
| 2002 | case FUNCTIONFS_SUSPEND: |
| 2003 | case FUNCTIONFS_SETUP: |
| 2004 | rem_type1 = type; |
| 2005 | /* discard all similar events */ |
| 2006 | break; |
| 2007 | |
| 2008 | case FUNCTIONFS_BIND: |
| 2009 | case FUNCTIONFS_UNBIND: |
| 2010 | case FUNCTIONFS_DISABLE: |
| 2011 | case FUNCTIONFS_ENABLE: |
| 2012 | /* discard everything other then power management. */ |
| 2013 | rem_type1 = FUNCTIONFS_SUSPEND; |
| 2014 | rem_type2 = FUNCTIONFS_RESUME; |
| 2015 | neg = 1; |
| 2016 | break; |
| 2017 | |
| 2018 | default: |
| 2019 | BUG(); |
| 2020 | } |
| 2021 | |
| 2022 | { |
| 2023 | u8 *ev = ffs->ev.types, *out = ev; |
| 2024 | unsigned n = ffs->ev.count; |
| 2025 | for (; n; --n, ++ev) |
| 2026 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) |
| 2027 | *out++ = *ev; |
| 2028 | else |
| 2029 | FVDBG("purging event %d", *ev); |
| 2030 | ffs->ev.count = out - ffs->ev.types; |
| 2031 | } |
| 2032 | |
| 2033 | FVDBG("adding event %d", type); |
| 2034 | ffs->ev.types[ffs->ev.count++] = type; |
| 2035 | wake_up_locked(&ffs->ev.waitq); |
| 2036 | } |
| 2037 | |
| 2038 | static void ffs_event_add(struct ffs_data *ffs, |
| 2039 | enum usb_functionfs_event_type type) |
| 2040 | { |
| 2041 | unsigned long flags; |
| 2042 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); |
| 2043 | __ffs_event_add(ffs, type); |
| 2044 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); |
| 2045 | } |
| 2046 | |
| 2047 | |
| 2048 | /* Bind/unbind USB function hooks *******************************************/ |
| 2049 | |
| 2050 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
| 2051 | struct usb_descriptor_header *desc, |
| 2052 | void *priv) |
| 2053 | { |
| 2054 | struct usb_endpoint_descriptor *ds = (void *)desc; |
| 2055 | struct ffs_function *func = priv; |
| 2056 | struct ffs_ep *ffs_ep; |
| 2057 | |
| 2058 | /* If hs_descriptors is not NULL then we are reading hs |
| 2059 | * descriptors now */ |
| 2060 | const int isHS = func->function.hs_descriptors != NULL; |
| 2061 | unsigned idx; |
| 2062 | |
| 2063 | if (type != FFS_DESCRIPTOR) |
| 2064 | return 0; |
| 2065 | |
| 2066 | if (isHS) |
| 2067 | func->function.hs_descriptors[(long)valuep] = desc; |
| 2068 | else |
| 2069 | func->function.descriptors[(long)valuep] = desc; |
| 2070 | |
| 2071 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) |
| 2072 | return 0; |
| 2073 | |
| 2074 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; |
| 2075 | ffs_ep = func->eps + idx; |
| 2076 | |
| 2077 | if (unlikely(ffs_ep->descs[isHS])) { |
| 2078 | FVDBG("two %sspeed descriptors for EP %d", |
| 2079 | isHS ? "high" : "full", |
| 2080 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 2081 | return -EINVAL; |
| 2082 | } |
| 2083 | ffs_ep->descs[isHS] = ds; |
| 2084 | |
| 2085 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); |
| 2086 | if (ffs_ep->ep) { |
| 2087 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; |
| 2088 | if (!ds->wMaxPacketSize) |
| 2089 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; |
| 2090 | } else { |
| 2091 | struct usb_request *req; |
| 2092 | struct usb_ep *ep; |
| 2093 | |
| 2094 | FVDBG("autoconfig"); |
| 2095 | ep = usb_ep_autoconfig(func->gadget, ds); |
| 2096 | if (unlikely(!ep)) |
| 2097 | return -ENOTSUPP; |
| 2098 | ep->driver_data = func->eps + idx;; |
| 2099 | |
| 2100 | req = usb_ep_alloc_request(ep, GFP_KERNEL); |
| 2101 | if (unlikely(!req)) |
| 2102 | return -ENOMEM; |
| 2103 | |
| 2104 | ffs_ep->ep = ep; |
| 2105 | ffs_ep->req = req; |
| 2106 | func->eps_revmap[ds->bEndpointAddress & |
| 2107 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; |
| 2108 | } |
| 2109 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); |
| 2110 | |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
| 2114 | |
| 2115 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
| 2116 | struct usb_descriptor_header *desc, |
| 2117 | void *priv) |
| 2118 | { |
| 2119 | struct ffs_function *func = priv; |
| 2120 | unsigned idx; |
| 2121 | u8 newValue; |
| 2122 | |
| 2123 | switch (type) { |
| 2124 | default: |
| 2125 | case FFS_DESCRIPTOR: |
| 2126 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ |
| 2127 | return 0; |
| 2128 | |
| 2129 | case FFS_INTERFACE: |
| 2130 | idx = *valuep; |
| 2131 | if (func->interfaces_nums[idx] < 0) { |
| 2132 | int id = usb_interface_id(func->conf, &func->function); |
| 2133 | if (unlikely(id < 0)) |
| 2134 | return id; |
| 2135 | func->interfaces_nums[idx] = id; |
| 2136 | } |
| 2137 | newValue = func->interfaces_nums[idx]; |
| 2138 | break; |
| 2139 | |
| 2140 | case FFS_STRING: |
| 2141 | /* String' IDs are allocated when fsf_data is bound to cdev */ |
| 2142 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; |
| 2143 | break; |
| 2144 | |
| 2145 | case FFS_ENDPOINT: |
| 2146 | /* USB_DT_ENDPOINT are handled in |
| 2147 | * __ffs_func_bind_do_descs(). */ |
| 2148 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
| 2149 | return 0; |
| 2150 | |
| 2151 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; |
| 2152 | if (unlikely(!func->eps[idx].ep)) |
| 2153 | return -EINVAL; |
| 2154 | |
| 2155 | { |
| 2156 | struct usb_endpoint_descriptor **descs; |
| 2157 | descs = func->eps[idx].descs; |
| 2158 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; |
| 2159 | } |
| 2160 | break; |
| 2161 | } |
| 2162 | |
| 2163 | FVDBG("%02x -> %02x", *valuep, newValue); |
| 2164 | *valuep = newValue; |
| 2165 | return 0; |
| 2166 | } |
| 2167 | |
| 2168 | static int ffs_func_bind(struct usb_configuration *c, |
| 2169 | struct usb_function *f) |
| 2170 | { |
| 2171 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2172 | struct ffs_data *ffs = func->ffs; |
| 2173 | |
| 2174 | const int full = !!func->ffs->fs_descs_count; |
| 2175 | const int high = gadget_is_dualspeed(func->gadget) && |
| 2176 | func->ffs->hs_descs_count; |
| 2177 | |
| 2178 | int ret; |
| 2179 | |
| 2180 | /* Make it a single chunk, less management later on */ |
| 2181 | struct { |
| 2182 | struct ffs_ep eps[ffs->eps_count]; |
| 2183 | struct usb_descriptor_header |
| 2184 | *fs_descs[full ? ffs->fs_descs_count + 1 : 0]; |
| 2185 | struct usb_descriptor_header |
| 2186 | *hs_descs[high ? ffs->hs_descs_count + 1 : 0]; |
| 2187 | short inums[ffs->interfaces_count]; |
| 2188 | char raw_descs[high ? ffs->raw_descs_length |
| 2189 | : ffs->raw_fs_descs_length]; |
| 2190 | } *data; |
| 2191 | |
| 2192 | ENTER(); |
| 2193 | |
| 2194 | /* Only high speed but not supported by gadget? */ |
| 2195 | if (unlikely(!(full | high))) |
| 2196 | return -ENOTSUPP; |
| 2197 | |
| 2198 | /* Allocate */ |
| 2199 | data = kmalloc(sizeof *data, GFP_KERNEL); |
| 2200 | if (unlikely(!data)) |
| 2201 | return -ENOMEM; |
| 2202 | |
| 2203 | /* Zero */ |
| 2204 | memset(data->eps, 0, sizeof data->eps); |
| 2205 | memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs); |
| 2206 | memset(data->inums, 0xff, sizeof data->inums); |
| 2207 | for (ret = ffs->eps_count; ret; --ret) |
| 2208 | data->eps[ret].num = -1; |
| 2209 | |
| 2210 | /* Save pointers */ |
| 2211 | func->eps = data->eps; |
| 2212 | func->interfaces_nums = data->inums; |
| 2213 | |
| 2214 | /* Go throught all the endpoint descriptors and allocate |
| 2215 | * endpoints first, so that later we can rewrite the endpoint |
| 2216 | * numbers without worying that it may be described later on. */ |
| 2217 | if (likely(full)) { |
| 2218 | func->function.descriptors = data->fs_descs; |
| 2219 | ret = ffs_do_descs(ffs->fs_descs_count, |
| 2220 | data->raw_descs, |
| 2221 | sizeof data->raw_descs, |
| 2222 | __ffs_func_bind_do_descs, func); |
| 2223 | if (unlikely(ret < 0)) |
| 2224 | goto error; |
| 2225 | } else { |
| 2226 | ret = 0; |
| 2227 | } |
| 2228 | |
| 2229 | if (likely(high)) { |
| 2230 | func->function.hs_descriptors = data->hs_descs; |
| 2231 | ret = ffs_do_descs(ffs->hs_descs_count, |
| 2232 | data->raw_descs + ret, |
| 2233 | (sizeof data->raw_descs) - ret, |
| 2234 | __ffs_func_bind_do_descs, func); |
| 2235 | } |
| 2236 | |
| 2237 | /* Now handle interface numbers allocation and interface and |
| 2238 | * enpoint numbers rewritting. We can do that in one go |
| 2239 | * now. */ |
| 2240 | ret = ffs_do_descs(ffs->fs_descs_count + |
| 2241 | (high ? ffs->hs_descs_count : 0), |
| 2242 | data->raw_descs, sizeof data->raw_descs, |
| 2243 | __ffs_func_bind_do_nums, func); |
| 2244 | if (unlikely(ret < 0)) |
| 2245 | goto error; |
| 2246 | |
| 2247 | /* And we're done */ |
| 2248 | ffs_event_add(ffs, FUNCTIONFS_BIND); |
| 2249 | return 0; |
| 2250 | |
| 2251 | error: |
| 2252 | /* XXX Do we need to release all claimed endpoints here? */ |
| 2253 | return ret; |
| 2254 | } |
| 2255 | |
| 2256 | |
| 2257 | /* Other USB function hooks *************************************************/ |
| 2258 | |
| 2259 | static void ffs_func_unbind(struct usb_configuration *c, |
| 2260 | struct usb_function *f) |
| 2261 | { |
| 2262 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2263 | struct ffs_data *ffs = func->ffs; |
| 2264 | |
| 2265 | ENTER(); |
| 2266 | |
| 2267 | if (ffs->func == func) { |
| 2268 | ffs_func_eps_disable(func); |
| 2269 | ffs->func = NULL; |
| 2270 | } |
| 2271 | |
| 2272 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); |
| 2273 | |
| 2274 | ffs_func_free(func); |
| 2275 | } |
| 2276 | |
| 2277 | |
| 2278 | static int ffs_func_set_alt(struct usb_function *f, |
| 2279 | unsigned interface, unsigned alt) |
| 2280 | { |
| 2281 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2282 | struct ffs_data *ffs = func->ffs; |
| 2283 | int ret = 0, intf; |
| 2284 | |
| 2285 | if (alt != (unsigned)-1) { |
| 2286 | intf = ffs_func_revmap_intf(func, interface); |
| 2287 | if (unlikely(intf < 0)) |
| 2288 | return intf; |
| 2289 | } |
| 2290 | |
| 2291 | if (ffs->func) |
| 2292 | ffs_func_eps_disable(ffs->func); |
| 2293 | |
| 2294 | if (ffs->state != FFS_ACTIVE) |
| 2295 | return -ENODEV; |
| 2296 | |
| 2297 | if (alt == (unsigned)-1) { |
| 2298 | ffs->func = NULL; |
| 2299 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); |
| 2300 | return 0; |
| 2301 | } |
| 2302 | |
| 2303 | ffs->func = func; |
| 2304 | ret = ffs_func_eps_enable(func); |
| 2305 | if (likely(ret >= 0)) |
| 2306 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); |
| 2307 | return ret; |
| 2308 | } |
| 2309 | |
| 2310 | static void ffs_func_disable(struct usb_function *f) |
| 2311 | { |
| 2312 | ffs_func_set_alt(f, 0, (unsigned)-1); |
| 2313 | } |
| 2314 | |
| 2315 | static int ffs_func_setup(struct usb_function *f, |
| 2316 | const struct usb_ctrlrequest *creq) |
| 2317 | { |
| 2318 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2319 | struct ffs_data *ffs = func->ffs; |
| 2320 | unsigned long flags; |
| 2321 | int ret; |
| 2322 | |
| 2323 | ENTER(); |
| 2324 | |
| 2325 | FVDBG("creq->bRequestType = %02x", creq->bRequestType); |
| 2326 | FVDBG("creq->bRequest = %02x", creq->bRequest); |
| 2327 | FVDBG("creq->wValue = %04x", le16_to_cpu(creq->wValue)); |
| 2328 | FVDBG("creq->wIndex = %04x", le16_to_cpu(creq->wIndex)); |
| 2329 | FVDBG("creq->wLength = %04x", le16_to_cpu(creq->wLength)); |
| 2330 | |
| 2331 | /* Most requests directed to interface go throught here |
| 2332 | * (notable exceptions are set/get interface) so we need to |
| 2333 | * handle them. All other either handled by composite or |
| 2334 | * passed to usb_configuration->setup() (if one is set). No |
| 2335 | * matter, we will handle requests directed to endpoint here |
| 2336 | * as well (as it's straightforward) but what to do with any |
| 2337 | * other request? */ |
| 2338 | |
| 2339 | if (ffs->state != FFS_ACTIVE) |
| 2340 | return -ENODEV; |
| 2341 | |
| 2342 | switch (creq->bRequestType & USB_RECIP_MASK) { |
| 2343 | case USB_RECIP_INTERFACE: |
| 2344 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); |
| 2345 | if (unlikely(ret < 0)) |
| 2346 | return ret; |
| 2347 | break; |
| 2348 | |
| 2349 | case USB_RECIP_ENDPOINT: |
| 2350 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); |
| 2351 | if (unlikely(ret < 0)) |
| 2352 | return ret; |
| 2353 | break; |
| 2354 | |
| 2355 | default: |
| 2356 | return -EOPNOTSUPP; |
| 2357 | } |
| 2358 | |
| 2359 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); |
| 2360 | ffs->ev.setup = *creq; |
| 2361 | ffs->ev.setup.wIndex = cpu_to_le16(ret); |
| 2362 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); |
| 2363 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); |
| 2364 | |
| 2365 | return 0; |
| 2366 | } |
| 2367 | |
| 2368 | static void ffs_func_suspend(struct usb_function *f) |
| 2369 | { |
| 2370 | ENTER(); |
| 2371 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); |
| 2372 | } |
| 2373 | |
| 2374 | static void ffs_func_resume(struct usb_function *f) |
| 2375 | { |
| 2376 | ENTER(); |
| 2377 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); |
| 2378 | } |
| 2379 | |
| 2380 | |
| 2381 | |
| 2382 | /* Enpoint and interface numbers reverse mapping ****************************/ |
| 2383 | |
| 2384 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) |
| 2385 | { |
| 2386 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; |
| 2387 | return num ? num : -EDOM; |
| 2388 | } |
| 2389 | |
| 2390 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) |
| 2391 | { |
| 2392 | short *nums = func->interfaces_nums; |
| 2393 | unsigned count = func->ffs->interfaces_count; |
| 2394 | |
| 2395 | for (; count; --count, ++nums) { |
| 2396 | if (*nums >= 0 && *nums == intf) |
| 2397 | return nums - func->interfaces_nums; |
| 2398 | } |
| 2399 | |
| 2400 | return -EDOM; |
| 2401 | } |
| 2402 | |
| 2403 | |
| 2404 | /* Misc helper functions ****************************************************/ |
| 2405 | |
| 2406 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) |
| 2407 | { |
| 2408 | return nonblock |
| 2409 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN |
| 2410 | : mutex_lock_interruptible(mutex); |
| 2411 | } |
| 2412 | |
| 2413 | |
| 2414 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
| 2415 | { |
| 2416 | char *data; |
| 2417 | |
| 2418 | if (unlikely(!len)) |
| 2419 | return NULL; |
| 2420 | |
| 2421 | data = kmalloc(len, GFP_KERNEL); |
| 2422 | if (unlikely(!data)) |
| 2423 | return ERR_PTR(-ENOMEM); |
| 2424 | |
| 2425 | if (unlikely(__copy_from_user(data, buf, len))) { |
| 2426 | kfree(data); |
| 2427 | return ERR_PTR(-EFAULT); |
| 2428 | } |
| 2429 | |
| 2430 | FVDBG("Buffer from user space:"); |
| 2431 | ffs_dump_mem("", data, len); |
| 2432 | |
| 2433 | return data; |
| 2434 | } |