Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1 | /* |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2 | * f_fs.c -- user mode file system API for USB composite function controllers |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2010 Samsung Electronics |
| 5 | * Author: Michal Nazarewicz <m.nazarewicz@samsung.com> |
| 6 | * |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 7 | * Based on inode.c (GadgetFS) which was: |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 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 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 42 | /* Debugging ****************************************************************/ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 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 { |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 74 | /* |
| 75 | * Waiting for descriptors and strings. |
| 76 | * |
| 77 | * In this state no open(2), read(2) or write(2) on epfiles |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 78 | * may succeed (which should not be the problem as there |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 79 | * should be no such files opened in the first place). |
| 80 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 81 | FFS_READ_DESCRIPTORS, |
| 82 | FFS_READ_STRINGS, |
| 83 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 84 | /* |
| 85 | * We've got descriptors and strings. We are or have called |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 86 | * functionfs_ready_callback(). functionfs_bind() may have |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 87 | * been called but we don't know. |
| 88 | * |
| 89 | * This is the only state in which operations on epfiles may |
| 90 | * succeed. |
| 91 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 92 | FFS_ACTIVE, |
| 93 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 94 | /* |
| 95 | * All endpoints have been closed. This state is also set if |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 96 | * we encounter an unrecoverable error. The only |
| 97 | * unrecoverable error is situation when after reading strings |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 98 | * from user space we fail to initialise epfiles or |
| 99 | * functionfs_ready_callback() returns with error (<0). |
| 100 | * |
| 101 | * In this state no open(2), read(2) or write(2) (both on ep0 |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 102 | * as well as epfile) may succeed (at this point epfiles are |
| 103 | * unlinked and all closed so this is not a problem; ep0 is |
| 104 | * also closed but ep0 file exists and so open(2) on ep0 must |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 105 | * fail). |
| 106 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 107 | FFS_CLOSING |
| 108 | }; |
| 109 | |
| 110 | |
| 111 | enum ffs_setup_state { |
| 112 | /* There is no setup request pending. */ |
| 113 | FFS_NO_SETUP, |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 114 | /* |
| 115 | * User has read events and there was a setup request event |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 116 | * there. The next read/write on ep0 will handle the |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 117 | * request. |
| 118 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 119 | FFS_SETUP_PENDING, |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 120 | /* |
| 121 | * There was event pending but before user space handled it |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 122 | * some other event was introduced which canceled existing |
| 123 | * setup. If this state is set read/write on ep0 return |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 124 | * -EIDRM. This state is only set when adding event. |
| 125 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 126 | FFS_SETUP_CANCELED |
| 127 | }; |
| 128 | |
| 129 | |
| 130 | |
| 131 | struct ffs_epfile; |
| 132 | struct ffs_function; |
| 133 | |
| 134 | struct ffs_data { |
| 135 | struct usb_gadget *gadget; |
| 136 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 137 | /* |
| 138 | * Protect access read/write operations, only one read/write |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 139 | * at a time. As a consequence protects ep0req and company. |
| 140 | * While setup request is being processed (queued) this is |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 141 | * held. |
| 142 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 143 | struct mutex mutex; |
| 144 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 145 | /* |
| 146 | * Protect access to endpoint related structures (basically |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 147 | * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 148 | * endpoint zero. |
| 149 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 150 | spinlock_t eps_lock; |
| 151 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 152 | /* |
| 153 | * XXX REVISIT do we need our own request? Since we are not |
| 154 | * handling setup requests immediately user space may be so |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 155 | * slow that another setup will be sent to the gadget but this |
| 156 | * time not to us but another function and then there could be |
Linus Torvalds | a4ce96a | 2010-07-21 09:25:42 -0700 | [diff] [blame] | 157 | * a race. Is that the case? Or maybe we can use cdev->req |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 158 | * after all, maybe we just need some spinlock for that? |
| 159 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 160 | struct usb_request *ep0req; /* P: mutex */ |
| 161 | struct completion ep0req_completion; /* P: mutex */ |
| 162 | int ep0req_status; /* P: mutex */ |
| 163 | |
| 164 | /* reference counter */ |
| 165 | atomic_t ref; |
| 166 | /* how many files are opened (EP0 and others) */ |
| 167 | atomic_t opened; |
| 168 | |
| 169 | /* EP0 state */ |
| 170 | enum ffs_state state; |
| 171 | |
| 172 | /* |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 173 | * Possible transitions: |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 174 | * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock |
| 175 | * happens only in ep0 read which is P: mutex |
| 176 | * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock |
| 177 | * happens only in ep0 i/o which is P: mutex |
| 178 | * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock |
| 179 | * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg |
| 180 | */ |
| 181 | enum ffs_setup_state setup_state; |
| 182 | |
| 183 | #define FFS_SETUP_STATE(ffs) \ |
| 184 | ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ |
| 185 | FFS_SETUP_CANCELED, FFS_NO_SETUP)) |
| 186 | |
| 187 | /* Events & such. */ |
| 188 | struct { |
| 189 | u8 types[4]; |
| 190 | unsigned short count; |
| 191 | /* XXX REVISIT need to update it in some places, or do we? */ |
| 192 | unsigned short can_stall; |
| 193 | struct usb_ctrlrequest setup; |
| 194 | |
| 195 | wait_queue_head_t waitq; |
| 196 | } ev; /* the whole structure, P: ev.waitq.lock */ |
| 197 | |
| 198 | /* Flags */ |
| 199 | unsigned long flags; |
| 200 | #define FFS_FL_CALL_CLOSED_CALLBACK 0 |
| 201 | #define FFS_FL_BOUND 1 |
| 202 | |
| 203 | /* Active function */ |
| 204 | struct ffs_function *func; |
| 205 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 206 | /* |
| 207 | * Device name, write once when file system is mounted. |
| 208 | * Intended for user to read if she wants. |
| 209 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 210 | const char *dev_name; |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 211 | /* Private data for our user (ie. gadget). Managed by user. */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 212 | void *private_data; |
| 213 | |
| 214 | /* filled by __ffs_data_got_descs() */ |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 215 | /* |
| 216 | * Real descriptors are 16 bytes after raw_descs (so you need |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 217 | * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the |
| 218 | * first full speed descriptor). raw_descs_length and |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 219 | * raw_fs_descs_length do not have those 16 bytes added. |
| 220 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 221 | const void *raw_descs; |
| 222 | unsigned raw_descs_length; |
| 223 | unsigned raw_fs_descs_length; |
| 224 | unsigned fs_descs_count; |
| 225 | unsigned hs_descs_count; |
| 226 | |
| 227 | unsigned short strings_count; |
| 228 | unsigned short interfaces_count; |
| 229 | unsigned short eps_count; |
| 230 | unsigned short _pad1; |
| 231 | |
| 232 | /* filled by __ffs_data_got_strings() */ |
| 233 | /* ids in stringtabs are set in functionfs_bind() */ |
| 234 | const void *raw_strings; |
| 235 | struct usb_gadget_strings **stringtabs; |
| 236 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 237 | /* |
| 238 | * File system's super block, write once when file system is |
| 239 | * mounted. |
| 240 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 241 | struct super_block *sb; |
| 242 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 243 | /* File permissions, written once when fs is mounted */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 244 | struct ffs_file_perms { |
| 245 | umode_t mode; |
| 246 | uid_t uid; |
| 247 | gid_t gid; |
| 248 | } file_perms; |
| 249 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 250 | /* |
| 251 | * The endpoint files, filled by ffs_epfiles_create(), |
| 252 | * destroyed by ffs_epfiles_destroy(). |
| 253 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 254 | struct ffs_epfile *epfiles; |
| 255 | }; |
| 256 | |
| 257 | /* Reference counter handling */ |
| 258 | static void ffs_data_get(struct ffs_data *ffs); |
| 259 | static void ffs_data_put(struct ffs_data *ffs); |
| 260 | /* Creates new ffs_data object. */ |
| 261 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); |
| 262 | |
| 263 | /* Opened counter handling. */ |
| 264 | static void ffs_data_opened(struct ffs_data *ffs); |
| 265 | static void ffs_data_closed(struct ffs_data *ffs); |
| 266 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 267 | /* Called with ffs->mutex held; take over ownership of data. */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 268 | static int __must_check |
| 269 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); |
| 270 | static int __must_check |
| 271 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); |
| 272 | |
| 273 | |
| 274 | /* The function structure ***************************************************/ |
| 275 | |
| 276 | struct ffs_ep; |
| 277 | |
| 278 | struct ffs_function { |
| 279 | struct usb_configuration *conf; |
| 280 | struct usb_gadget *gadget; |
| 281 | struct ffs_data *ffs; |
| 282 | |
| 283 | struct ffs_ep *eps; |
| 284 | u8 eps_revmap[16]; |
| 285 | short *interfaces_nums; |
| 286 | |
| 287 | struct usb_function function; |
| 288 | }; |
| 289 | |
| 290 | |
| 291 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) |
| 292 | { |
| 293 | return container_of(f, struct ffs_function, function); |
| 294 | } |
| 295 | |
| 296 | static void ffs_func_free(struct ffs_function *func); |
| 297 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 298 | static void ffs_func_eps_disable(struct ffs_function *func); |
| 299 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); |
| 300 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 301 | static int ffs_func_bind(struct usb_configuration *, |
| 302 | struct usb_function *); |
| 303 | static void ffs_func_unbind(struct usb_configuration *, |
| 304 | struct usb_function *); |
| 305 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
| 306 | static void ffs_func_disable(struct usb_function *); |
| 307 | static int ffs_func_setup(struct usb_function *, |
| 308 | const struct usb_ctrlrequest *); |
| 309 | static void ffs_func_suspend(struct usb_function *); |
| 310 | static void ffs_func_resume(struct usb_function *); |
| 311 | |
| 312 | |
| 313 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); |
| 314 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); |
| 315 | |
| 316 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 317 | /* The endpoints structures *************************************************/ |
| 318 | |
| 319 | struct ffs_ep { |
| 320 | struct usb_ep *ep; /* P: ffs->eps_lock */ |
| 321 | struct usb_request *req; /* P: epfile->mutex */ |
| 322 | |
| 323 | /* [0]: full speed, [1]: high speed */ |
| 324 | struct usb_endpoint_descriptor *descs[2]; |
| 325 | |
| 326 | u8 num; |
| 327 | |
| 328 | int status; /* P: epfile->mutex */ |
| 329 | }; |
| 330 | |
| 331 | struct ffs_epfile { |
| 332 | /* Protects ep->ep and ep->req. */ |
| 333 | struct mutex mutex; |
| 334 | wait_queue_head_t wait; |
| 335 | |
| 336 | struct ffs_data *ffs; |
| 337 | struct ffs_ep *ep; /* P: ffs->eps_lock */ |
| 338 | |
| 339 | struct dentry *dentry; |
| 340 | |
| 341 | char name[5]; |
| 342 | |
| 343 | unsigned char in; /* P: ffs->eps_lock */ |
| 344 | unsigned char isoc; /* P: ffs->eps_lock */ |
| 345 | |
| 346 | unsigned char _pad; |
| 347 | }; |
| 348 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 349 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
| 350 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); |
| 351 | |
| 352 | static struct inode *__must_check |
| 353 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
| 354 | const struct file_operations *fops, |
| 355 | struct dentry **dentry_p); |
| 356 | |
| 357 | |
| 358 | /* Misc helper functions ****************************************************/ |
| 359 | |
| 360 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) |
| 361 | __attribute__((warn_unused_result, nonnull)); |
| 362 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
| 363 | __attribute__((warn_unused_result, nonnull)); |
| 364 | |
| 365 | |
| 366 | /* Control file aka ep0 *****************************************************/ |
| 367 | |
| 368 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) |
| 369 | { |
| 370 | struct ffs_data *ffs = req->context; |
| 371 | |
| 372 | complete_all(&ffs->ep0req_completion); |
| 373 | } |
| 374 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 375 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
| 376 | { |
| 377 | struct usb_request *req = ffs->ep0req; |
| 378 | int ret; |
| 379 | |
| 380 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); |
| 381 | |
| 382 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 383 | |
| 384 | req->buf = data; |
| 385 | req->length = len; |
| 386 | |
| 387 | INIT_COMPLETION(ffs->ep0req_completion); |
| 388 | |
| 389 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); |
| 390 | if (unlikely(ret < 0)) |
| 391 | return ret; |
| 392 | |
| 393 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); |
| 394 | if (unlikely(ret)) { |
| 395 | usb_ep_dequeue(ffs->gadget->ep0, req); |
| 396 | return -EINTR; |
| 397 | } |
| 398 | |
| 399 | ffs->setup_state = FFS_NO_SETUP; |
| 400 | return ffs->ep0req_status; |
| 401 | } |
| 402 | |
| 403 | static int __ffs_ep0_stall(struct ffs_data *ffs) |
| 404 | { |
| 405 | if (ffs->ev.can_stall) { |
| 406 | FVDBG("ep0 stall\n"); |
| 407 | usb_ep_set_halt(ffs->gadget->ep0); |
| 408 | ffs->setup_state = FFS_NO_SETUP; |
| 409 | return -EL2HLT; |
| 410 | } else { |
| 411 | FDBG("bogus ep0 stall!\n"); |
| 412 | return -ESRCH; |
| 413 | } |
| 414 | } |
| 415 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 416 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
| 417 | size_t len, loff_t *ptr) |
| 418 | { |
| 419 | struct ffs_data *ffs = file->private_data; |
| 420 | ssize_t ret; |
| 421 | char *data; |
| 422 | |
| 423 | ENTER(); |
| 424 | |
| 425 | /* Fast check if setup was canceled */ |
| 426 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) |
| 427 | return -EIDRM; |
| 428 | |
| 429 | /* Acquire mutex */ |
| 430 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); |
| 431 | if (unlikely(ret < 0)) |
| 432 | return ret; |
| 433 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 434 | /* Check state */ |
| 435 | switch (ffs->state) { |
| 436 | case FFS_READ_DESCRIPTORS: |
| 437 | case FFS_READ_STRINGS: |
| 438 | /* Copy data */ |
| 439 | if (unlikely(len < 16)) { |
| 440 | ret = -EINVAL; |
| 441 | break; |
| 442 | } |
| 443 | |
| 444 | data = ffs_prepare_buffer(buf, len); |
| 445 | if (unlikely(IS_ERR(data))) { |
| 446 | ret = PTR_ERR(data); |
| 447 | break; |
| 448 | } |
| 449 | |
| 450 | /* Handle data */ |
| 451 | if (ffs->state == FFS_READ_DESCRIPTORS) { |
| 452 | FINFO("read descriptors"); |
| 453 | ret = __ffs_data_got_descs(ffs, data, len); |
| 454 | if (unlikely(ret < 0)) |
| 455 | break; |
| 456 | |
| 457 | ffs->state = FFS_READ_STRINGS; |
| 458 | ret = len; |
| 459 | } else { |
| 460 | FINFO("read strings"); |
| 461 | ret = __ffs_data_got_strings(ffs, data, len); |
| 462 | if (unlikely(ret < 0)) |
| 463 | break; |
| 464 | |
| 465 | ret = ffs_epfiles_create(ffs); |
| 466 | if (unlikely(ret)) { |
| 467 | ffs->state = FFS_CLOSING; |
| 468 | break; |
| 469 | } |
| 470 | |
| 471 | ffs->state = FFS_ACTIVE; |
| 472 | mutex_unlock(&ffs->mutex); |
| 473 | |
| 474 | ret = functionfs_ready_callback(ffs); |
| 475 | if (unlikely(ret < 0)) { |
| 476 | ffs->state = FFS_CLOSING; |
| 477 | return ret; |
| 478 | } |
| 479 | |
| 480 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
| 481 | return len; |
| 482 | } |
| 483 | break; |
| 484 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 485 | case FFS_ACTIVE: |
| 486 | data = NULL; |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 487 | /* |
| 488 | * We're called from user space, we can use _irq |
| 489 | * rather then _irqsave |
| 490 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 491 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 492 | switch (FFS_SETUP_STATE(ffs)) { |
| 493 | case FFS_SETUP_CANCELED: |
| 494 | ret = -EIDRM; |
| 495 | goto done_spin; |
| 496 | |
| 497 | case FFS_NO_SETUP: |
| 498 | ret = -ESRCH; |
| 499 | goto done_spin; |
| 500 | |
| 501 | case FFS_SETUP_PENDING: |
| 502 | break; |
| 503 | } |
| 504 | |
| 505 | /* FFS_SETUP_PENDING */ |
| 506 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { |
| 507 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 508 | ret = __ffs_ep0_stall(ffs); |
| 509 | break; |
| 510 | } |
| 511 | |
| 512 | /* FFS_SETUP_PENDING and not stall */ |
| 513 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); |
| 514 | |
| 515 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 516 | |
| 517 | data = ffs_prepare_buffer(buf, len); |
| 518 | if (unlikely(IS_ERR(data))) { |
| 519 | ret = PTR_ERR(data); |
| 520 | break; |
| 521 | } |
| 522 | |
| 523 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 524 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 525 | /* |
| 526 | * We are guaranteed to be still in FFS_ACTIVE state |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 527 | * but the state of setup could have changed from |
| 528 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need |
| 529 | * to check for that. If that happened we copied data |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 530 | * from user space in vain but it's unlikely. |
| 531 | * |
| 532 | * For sure we are not in FFS_NO_SETUP since this is |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 533 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
| 534 | * transition can be performed and it's protected by |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 535 | * mutex. |
| 536 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 537 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
| 538 | ret = -EIDRM; |
| 539 | done_spin: |
| 540 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 541 | } else { |
| 542 | /* unlocks spinlock */ |
| 543 | ret = __ffs_ep0_queue_wait(ffs, data, len); |
| 544 | } |
| 545 | kfree(data); |
| 546 | break; |
| 547 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 548 | default: |
| 549 | ret = -EBADFD; |
| 550 | break; |
| 551 | } |
| 552 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 553 | mutex_unlock(&ffs->mutex); |
| 554 | return ret; |
| 555 | } |
| 556 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 557 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
| 558 | size_t n) |
| 559 | { |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 560 | /* |
| 561 | * We are holding ffs->ev.waitq.lock and ffs->mutex and we need |
| 562 | * to release them. |
| 563 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 564 | struct usb_functionfs_event events[n]; |
| 565 | unsigned i = 0; |
| 566 | |
| 567 | memset(events, 0, sizeof events); |
| 568 | |
| 569 | do { |
| 570 | events[i].type = ffs->ev.types[i]; |
| 571 | if (events[i].type == FUNCTIONFS_SETUP) { |
| 572 | events[i].u.setup = ffs->ev.setup; |
| 573 | ffs->setup_state = FFS_SETUP_PENDING; |
| 574 | } |
| 575 | } while (++i < n); |
| 576 | |
| 577 | if (n < ffs->ev.count) { |
| 578 | ffs->ev.count -= n; |
| 579 | memmove(ffs->ev.types, ffs->ev.types + n, |
| 580 | ffs->ev.count * sizeof *ffs->ev.types); |
| 581 | } else { |
| 582 | ffs->ev.count = 0; |
| 583 | } |
| 584 | |
| 585 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 586 | mutex_unlock(&ffs->mutex); |
| 587 | |
| 588 | return unlikely(__copy_to_user(buf, events, sizeof events)) |
| 589 | ? -EFAULT : sizeof events; |
| 590 | } |
| 591 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 592 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
| 593 | size_t len, loff_t *ptr) |
| 594 | { |
| 595 | struct ffs_data *ffs = file->private_data; |
| 596 | char *data = NULL; |
| 597 | size_t n; |
| 598 | int ret; |
| 599 | |
| 600 | ENTER(); |
| 601 | |
| 602 | /* Fast check if setup was canceled */ |
| 603 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) |
| 604 | return -EIDRM; |
| 605 | |
| 606 | /* Acquire mutex */ |
| 607 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); |
| 608 | if (unlikely(ret < 0)) |
| 609 | return ret; |
| 610 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 611 | /* Check state */ |
| 612 | if (ffs->state != FFS_ACTIVE) { |
| 613 | ret = -EBADFD; |
| 614 | goto done_mutex; |
| 615 | } |
| 616 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 617 | /* |
| 618 | * We're called from user space, we can use _irq rather then |
| 619 | * _irqsave |
| 620 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 621 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 622 | |
| 623 | switch (FFS_SETUP_STATE(ffs)) { |
| 624 | case FFS_SETUP_CANCELED: |
| 625 | ret = -EIDRM; |
| 626 | break; |
| 627 | |
| 628 | case FFS_NO_SETUP: |
| 629 | n = len / sizeof(struct usb_functionfs_event); |
| 630 | if (unlikely(!n)) { |
| 631 | ret = -EINVAL; |
| 632 | break; |
| 633 | } |
| 634 | |
| 635 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { |
| 636 | ret = -EAGAIN; |
| 637 | break; |
| 638 | } |
| 639 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 640 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
| 641 | ffs->ev.count)) { |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 642 | ret = -EINTR; |
| 643 | break; |
| 644 | } |
| 645 | |
| 646 | return __ffs_ep0_read_events(ffs, buf, |
| 647 | min(n, (size_t)ffs->ev.count)); |
| 648 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 649 | case FFS_SETUP_PENDING: |
| 650 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { |
| 651 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 652 | ret = __ffs_ep0_stall(ffs); |
| 653 | goto done_mutex; |
| 654 | } |
| 655 | |
| 656 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); |
| 657 | |
| 658 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 659 | |
| 660 | if (likely(len)) { |
| 661 | data = kmalloc(len, GFP_KERNEL); |
| 662 | if (unlikely(!data)) { |
| 663 | ret = -ENOMEM; |
| 664 | goto done_mutex; |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | spin_lock_irq(&ffs->ev.waitq.lock); |
| 669 | |
| 670 | /* See ffs_ep0_write() */ |
| 671 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
| 672 | ret = -EIDRM; |
| 673 | break; |
| 674 | } |
| 675 | |
| 676 | /* unlocks spinlock */ |
| 677 | ret = __ffs_ep0_queue_wait(ffs, data, len); |
| 678 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) |
| 679 | ret = -EFAULT; |
| 680 | goto done_mutex; |
| 681 | |
| 682 | default: |
| 683 | ret = -EBADFD; |
| 684 | break; |
| 685 | } |
| 686 | |
| 687 | spin_unlock_irq(&ffs->ev.waitq.lock); |
| 688 | done_mutex: |
| 689 | mutex_unlock(&ffs->mutex); |
| 690 | kfree(data); |
| 691 | return ret; |
| 692 | } |
| 693 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 694 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
| 695 | { |
| 696 | struct ffs_data *ffs = inode->i_private; |
| 697 | |
| 698 | ENTER(); |
| 699 | |
| 700 | if (unlikely(ffs->state == FFS_CLOSING)) |
| 701 | return -EBUSY; |
| 702 | |
| 703 | file->private_data = ffs; |
| 704 | ffs_data_opened(ffs); |
| 705 | |
| 706 | return 0; |
| 707 | } |
| 708 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 709 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
| 710 | { |
| 711 | struct ffs_data *ffs = file->private_data; |
| 712 | |
| 713 | ENTER(); |
| 714 | |
| 715 | ffs_data_closed(ffs); |
| 716 | |
| 717 | return 0; |
| 718 | } |
| 719 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 720 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
| 721 | { |
| 722 | struct ffs_data *ffs = file->private_data; |
| 723 | struct usb_gadget *gadget = ffs->gadget; |
| 724 | long ret; |
| 725 | |
| 726 | ENTER(); |
| 727 | |
| 728 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { |
| 729 | struct ffs_function *func = ffs->func; |
| 730 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; |
| 731 | } else if (gadget->ops->ioctl) { |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 732 | ret = gadget->ops->ioctl(gadget, code, value); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 733 | } else { |
| 734 | ret = -ENOTTY; |
| 735 | } |
| 736 | |
| 737 | return ret; |
| 738 | } |
| 739 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 740 | static const struct file_operations ffs_ep0_operations = { |
| 741 | .owner = THIS_MODULE, |
| 742 | .llseek = no_llseek, |
| 743 | |
| 744 | .open = ffs_ep0_open, |
| 745 | .write = ffs_ep0_write, |
| 746 | .read = ffs_ep0_read, |
| 747 | .release = ffs_ep0_release, |
| 748 | .unlocked_ioctl = ffs_ep0_ioctl, |
| 749 | }; |
| 750 | |
| 751 | |
| 752 | /* "Normal" endpoints operations ********************************************/ |
| 753 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 754 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
| 755 | { |
| 756 | ENTER(); |
| 757 | if (likely(req->context)) { |
| 758 | struct ffs_ep *ep = _ep->driver_data; |
| 759 | ep->status = req->status ? req->status : req->actual; |
| 760 | complete(req->context); |
| 761 | } |
| 762 | } |
| 763 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 764 | static ssize_t ffs_epfile_io(struct file *file, |
| 765 | char __user *buf, size_t len, int read) |
| 766 | { |
| 767 | struct ffs_epfile *epfile = file->private_data; |
| 768 | struct ffs_ep *ep; |
| 769 | char *data = NULL; |
| 770 | ssize_t ret; |
| 771 | int halt; |
| 772 | |
| 773 | goto first_try; |
| 774 | do { |
| 775 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 776 | mutex_unlock(&epfile->mutex); |
| 777 | |
| 778 | first_try: |
| 779 | /* Are we still active? */ |
| 780 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { |
| 781 | ret = -ENODEV; |
| 782 | goto error; |
| 783 | } |
| 784 | |
| 785 | /* Wait for endpoint to be enabled */ |
| 786 | ep = epfile->ep; |
| 787 | if (!ep) { |
| 788 | if (file->f_flags & O_NONBLOCK) { |
| 789 | ret = -EAGAIN; |
| 790 | goto error; |
| 791 | } |
| 792 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 793 | if (wait_event_interruptible(epfile->wait, |
| 794 | (ep = epfile->ep))) { |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 795 | ret = -EINTR; |
| 796 | goto error; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | /* Do we halt? */ |
| 801 | halt = !read == !epfile->in; |
| 802 | if (halt && epfile->isoc) { |
| 803 | ret = -EINVAL; |
| 804 | goto error; |
| 805 | } |
| 806 | |
| 807 | /* Allocate & copy */ |
| 808 | if (!halt && !data) { |
| 809 | data = kzalloc(len, GFP_KERNEL); |
| 810 | if (unlikely(!data)) |
| 811 | return -ENOMEM; |
| 812 | |
| 813 | if (!read && |
| 814 | unlikely(__copy_from_user(data, buf, len))) { |
| 815 | ret = -EFAULT; |
| 816 | goto error; |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | /* We will be using request */ |
| 821 | ret = ffs_mutex_lock(&epfile->mutex, |
| 822 | file->f_flags & O_NONBLOCK); |
| 823 | if (unlikely(ret)) |
| 824 | goto error; |
| 825 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 826 | /* |
| 827 | * We're called from user space, we can use _irq rather then |
| 828 | * _irqsave |
| 829 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 830 | spin_lock_irq(&epfile->ffs->eps_lock); |
| 831 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 832 | /* |
| 833 | * While we were acquiring mutex endpoint got disabled |
| 834 | * or changed? |
| 835 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 836 | } while (unlikely(epfile->ep != ep)); |
| 837 | |
| 838 | /* Halt */ |
| 839 | if (unlikely(halt)) { |
| 840 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
| 841 | usb_ep_set_halt(ep->ep); |
| 842 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 843 | ret = -EBADMSG; |
| 844 | } else { |
| 845 | /* Fire the request */ |
| 846 | DECLARE_COMPLETION_ONSTACK(done); |
| 847 | |
| 848 | struct usb_request *req = ep->req; |
| 849 | req->context = &done; |
| 850 | req->complete = ffs_epfile_io_complete; |
| 851 | req->buf = data; |
| 852 | req->length = len; |
| 853 | |
| 854 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
| 855 | |
| 856 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 857 | |
| 858 | if (unlikely(ret < 0)) { |
| 859 | /* nop */ |
| 860 | } else if (unlikely(wait_for_completion_interruptible(&done))) { |
| 861 | ret = -EINTR; |
| 862 | usb_ep_dequeue(ep->ep, req); |
| 863 | } else { |
| 864 | ret = ep->status; |
| 865 | if (read && ret > 0 && |
| 866 | unlikely(copy_to_user(buf, data, ret))) |
| 867 | ret = -EFAULT; |
| 868 | } |
| 869 | } |
| 870 | |
| 871 | mutex_unlock(&epfile->mutex); |
| 872 | error: |
| 873 | kfree(data); |
| 874 | return ret; |
| 875 | } |
| 876 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 877 | static ssize_t |
| 878 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, |
| 879 | loff_t *ptr) |
| 880 | { |
| 881 | ENTER(); |
| 882 | |
| 883 | return ffs_epfile_io(file, (char __user *)buf, len, 0); |
| 884 | } |
| 885 | |
| 886 | static ssize_t |
| 887 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) |
| 888 | { |
| 889 | ENTER(); |
| 890 | |
| 891 | return ffs_epfile_io(file, buf, len, 1); |
| 892 | } |
| 893 | |
| 894 | static int |
| 895 | ffs_epfile_open(struct inode *inode, struct file *file) |
| 896 | { |
| 897 | struct ffs_epfile *epfile = inode->i_private; |
| 898 | |
| 899 | ENTER(); |
| 900 | |
| 901 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
| 902 | return -ENODEV; |
| 903 | |
| 904 | file->private_data = epfile; |
| 905 | ffs_data_opened(epfile->ffs); |
| 906 | |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | static int |
| 911 | ffs_epfile_release(struct inode *inode, struct file *file) |
| 912 | { |
| 913 | struct ffs_epfile *epfile = inode->i_private; |
| 914 | |
| 915 | ENTER(); |
| 916 | |
| 917 | ffs_data_closed(epfile->ffs); |
| 918 | |
| 919 | return 0; |
| 920 | } |
| 921 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 922 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
| 923 | unsigned long value) |
| 924 | { |
| 925 | struct ffs_epfile *epfile = file->private_data; |
| 926 | int ret; |
| 927 | |
| 928 | ENTER(); |
| 929 | |
| 930 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
| 931 | return -ENODEV; |
| 932 | |
| 933 | spin_lock_irq(&epfile->ffs->eps_lock); |
| 934 | if (likely(epfile->ep)) { |
| 935 | switch (code) { |
| 936 | case FUNCTIONFS_FIFO_STATUS: |
| 937 | ret = usb_ep_fifo_status(epfile->ep->ep); |
| 938 | break; |
| 939 | case FUNCTIONFS_FIFO_FLUSH: |
| 940 | usb_ep_fifo_flush(epfile->ep->ep); |
| 941 | ret = 0; |
| 942 | break; |
| 943 | case FUNCTIONFS_CLEAR_HALT: |
| 944 | ret = usb_ep_clear_halt(epfile->ep->ep); |
| 945 | break; |
| 946 | case FUNCTIONFS_ENDPOINT_REVMAP: |
| 947 | ret = epfile->ep->num; |
| 948 | break; |
| 949 | default: |
| 950 | ret = -ENOTTY; |
| 951 | } |
| 952 | } else { |
| 953 | ret = -ENODEV; |
| 954 | } |
| 955 | spin_unlock_irq(&epfile->ffs->eps_lock); |
| 956 | |
| 957 | return ret; |
| 958 | } |
| 959 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 960 | static const struct file_operations ffs_epfile_operations = { |
| 961 | .owner = THIS_MODULE, |
| 962 | .llseek = no_llseek, |
| 963 | |
| 964 | .open = ffs_epfile_open, |
| 965 | .write = ffs_epfile_write, |
| 966 | .read = ffs_epfile_read, |
| 967 | .release = ffs_epfile_release, |
| 968 | .unlocked_ioctl = ffs_epfile_ioctl, |
| 969 | }; |
| 970 | |
| 971 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 972 | /* File system and super block operations ***********************************/ |
| 973 | |
| 974 | /* |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 975 | * Mounting the file system creates a controller file, used first for |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 976 | * function configuration then later for event monitoring. |
| 977 | */ |
| 978 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 979 | static struct inode *__must_check |
| 980 | ffs_sb_make_inode(struct super_block *sb, void *data, |
| 981 | const struct file_operations *fops, |
| 982 | const struct inode_operations *iops, |
| 983 | struct ffs_file_perms *perms) |
| 984 | { |
| 985 | struct inode *inode; |
| 986 | |
| 987 | ENTER(); |
| 988 | |
| 989 | inode = new_inode(sb); |
| 990 | |
| 991 | if (likely(inode)) { |
| 992 | struct timespec current_time = CURRENT_TIME; |
| 993 | |
Al Viro | 12ba8d1 | 2010-10-27 04:19:36 +0100 | [diff] [blame] | 994 | inode->i_ino = get_next_ino(); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 995 | inode->i_mode = perms->mode; |
| 996 | inode->i_uid = perms->uid; |
| 997 | inode->i_gid = perms->gid; |
| 998 | inode->i_atime = current_time; |
| 999 | inode->i_mtime = current_time; |
| 1000 | inode->i_ctime = current_time; |
| 1001 | inode->i_private = data; |
| 1002 | if (fops) |
| 1003 | inode->i_fop = fops; |
| 1004 | if (iops) |
| 1005 | inode->i_op = iops; |
| 1006 | } |
| 1007 | |
| 1008 | return inode; |
| 1009 | } |
| 1010 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1011 | /* Create "regular" file */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1012 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
| 1013 | const char *name, void *data, |
| 1014 | const struct file_operations *fops, |
| 1015 | struct dentry **dentry_p) |
| 1016 | { |
| 1017 | struct ffs_data *ffs = sb->s_fs_info; |
| 1018 | struct dentry *dentry; |
| 1019 | struct inode *inode; |
| 1020 | |
| 1021 | ENTER(); |
| 1022 | |
| 1023 | dentry = d_alloc_name(sb->s_root, name); |
| 1024 | if (unlikely(!dentry)) |
| 1025 | return NULL; |
| 1026 | |
| 1027 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); |
| 1028 | if (unlikely(!inode)) { |
| 1029 | dput(dentry); |
| 1030 | return NULL; |
| 1031 | } |
| 1032 | |
| 1033 | d_add(dentry, inode); |
| 1034 | if (dentry_p) |
| 1035 | *dentry_p = dentry; |
| 1036 | |
| 1037 | return inode; |
| 1038 | } |
| 1039 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1040 | /* Super block */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1041 | static const struct super_operations ffs_sb_operations = { |
| 1042 | .statfs = simple_statfs, |
| 1043 | .drop_inode = generic_delete_inode, |
| 1044 | }; |
| 1045 | |
| 1046 | struct ffs_sb_fill_data { |
| 1047 | struct ffs_file_perms perms; |
| 1048 | umode_t root_mode; |
| 1049 | const char *dev_name; |
| 1050 | }; |
| 1051 | |
| 1052 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) |
| 1053 | { |
| 1054 | struct ffs_sb_fill_data *data = _data; |
| 1055 | struct inode *inode; |
| 1056 | struct dentry *d; |
| 1057 | struct ffs_data *ffs; |
| 1058 | |
| 1059 | ENTER(); |
| 1060 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1061 | /* Initialise data */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1062 | ffs = ffs_data_new(); |
| 1063 | if (unlikely(!ffs)) |
| 1064 | goto enomem0; |
| 1065 | |
| 1066 | ffs->sb = sb; |
| 1067 | ffs->dev_name = data->dev_name; |
| 1068 | ffs->file_perms = data->perms; |
| 1069 | |
| 1070 | sb->s_fs_info = ffs; |
| 1071 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 1072 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 1073 | sb->s_magic = FUNCTIONFS_MAGIC; |
| 1074 | sb->s_op = &ffs_sb_operations; |
| 1075 | sb->s_time_gran = 1; |
| 1076 | |
| 1077 | /* Root inode */ |
| 1078 | data->perms.mode = data->root_mode; |
| 1079 | inode = ffs_sb_make_inode(sb, NULL, |
| 1080 | &simple_dir_operations, |
| 1081 | &simple_dir_inode_operations, |
| 1082 | &data->perms); |
| 1083 | if (unlikely(!inode)) |
| 1084 | goto enomem1; |
| 1085 | d = d_alloc_root(inode); |
| 1086 | if (unlikely(!d)) |
| 1087 | goto enomem2; |
| 1088 | sb->s_root = d; |
| 1089 | |
| 1090 | /* EP0 file */ |
| 1091 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, |
| 1092 | &ffs_ep0_operations, NULL))) |
| 1093 | goto enomem3; |
| 1094 | |
| 1095 | return 0; |
| 1096 | |
| 1097 | enomem3: |
| 1098 | dput(d); |
| 1099 | enomem2: |
| 1100 | iput(inode); |
| 1101 | enomem1: |
| 1102 | ffs_data_put(ffs); |
| 1103 | enomem0: |
| 1104 | return -ENOMEM; |
| 1105 | } |
| 1106 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1107 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
| 1108 | { |
| 1109 | ENTER(); |
| 1110 | |
| 1111 | if (!opts || !*opts) |
| 1112 | return 0; |
| 1113 | |
| 1114 | for (;;) { |
| 1115 | char *end, *eq, *comma; |
| 1116 | unsigned long value; |
| 1117 | |
| 1118 | /* Option limit */ |
| 1119 | comma = strchr(opts, ','); |
| 1120 | if (comma) |
| 1121 | *comma = 0; |
| 1122 | |
| 1123 | /* Value limit */ |
| 1124 | eq = strchr(opts, '='); |
| 1125 | if (unlikely(!eq)) { |
| 1126 | FERR("'=' missing in %s", opts); |
| 1127 | return -EINVAL; |
| 1128 | } |
| 1129 | *eq = 0; |
| 1130 | |
| 1131 | /* Parse value */ |
| 1132 | value = simple_strtoul(eq + 1, &end, 0); |
| 1133 | if (unlikely(*end != ',' && *end != 0)) { |
| 1134 | FERR("%s: invalid value: %s", opts, eq + 1); |
| 1135 | return -EINVAL; |
| 1136 | } |
| 1137 | |
| 1138 | /* Interpret option */ |
| 1139 | switch (eq - opts) { |
| 1140 | case 5: |
| 1141 | if (!memcmp(opts, "rmode", 5)) |
| 1142 | data->root_mode = (value & 0555) | S_IFDIR; |
| 1143 | else if (!memcmp(opts, "fmode", 5)) |
| 1144 | data->perms.mode = (value & 0666) | S_IFREG; |
| 1145 | else |
| 1146 | goto invalid; |
| 1147 | break; |
| 1148 | |
| 1149 | case 4: |
| 1150 | if (!memcmp(opts, "mode", 4)) { |
| 1151 | data->root_mode = (value & 0555) | S_IFDIR; |
| 1152 | data->perms.mode = (value & 0666) | S_IFREG; |
| 1153 | } else { |
| 1154 | goto invalid; |
| 1155 | } |
| 1156 | break; |
| 1157 | |
| 1158 | case 3: |
| 1159 | if (!memcmp(opts, "uid", 3)) |
| 1160 | data->perms.uid = value; |
| 1161 | else if (!memcmp(opts, "gid", 3)) |
| 1162 | data->perms.gid = value; |
| 1163 | else |
| 1164 | goto invalid; |
| 1165 | break; |
| 1166 | |
| 1167 | default: |
| 1168 | invalid: |
| 1169 | FERR("%s: invalid option", opts); |
| 1170 | return -EINVAL; |
| 1171 | } |
| 1172 | |
| 1173 | /* Next iteration */ |
| 1174 | if (!comma) |
| 1175 | break; |
| 1176 | opts = comma + 1; |
| 1177 | } |
| 1178 | |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1182 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
| 1183 | |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1184 | static struct dentry * |
| 1185 | ffs_fs_mount(struct file_system_type *t, int flags, |
| 1186 | const char *dev_name, void *opts) |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1187 | { |
| 1188 | struct ffs_sb_fill_data data = { |
| 1189 | .perms = { |
| 1190 | .mode = S_IFREG | 0600, |
| 1191 | .uid = 0, |
| 1192 | .gid = 0 |
| 1193 | }, |
| 1194 | .root_mode = S_IFDIR | 0500, |
| 1195 | }; |
| 1196 | int ret; |
| 1197 | |
| 1198 | ENTER(); |
| 1199 | |
| 1200 | ret = functionfs_check_dev_callback(dev_name); |
| 1201 | if (unlikely(ret < 0)) |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1202 | return ERR_PTR(ret); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1203 | |
| 1204 | ret = ffs_fs_parse_opts(&data, opts); |
| 1205 | if (unlikely(ret < 0)) |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1206 | return ERR_PTR(ret); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1207 | |
| 1208 | data.dev_name = dev_name; |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1209 | return mount_single(t, flags, &data, ffs_sb_fill); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1210 | } |
| 1211 | |
| 1212 | static void |
| 1213 | ffs_fs_kill_sb(struct super_block *sb) |
| 1214 | { |
| 1215 | void *ptr; |
| 1216 | |
| 1217 | ENTER(); |
| 1218 | |
| 1219 | kill_litter_super(sb); |
| 1220 | ptr = xchg(&sb->s_fs_info, NULL); |
| 1221 | if (ptr) |
| 1222 | ffs_data_put(ptr); |
| 1223 | } |
| 1224 | |
| 1225 | static struct file_system_type ffs_fs_type = { |
| 1226 | .owner = THIS_MODULE, |
| 1227 | .name = "functionfs", |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1228 | .mount = ffs_fs_mount, |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1229 | .kill_sb = ffs_fs_kill_sb, |
| 1230 | }; |
| 1231 | |
| 1232 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1233 | /* Driver's main init/cleanup functions *************************************/ |
| 1234 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1235 | static int functionfs_init(void) |
| 1236 | { |
| 1237 | int ret; |
| 1238 | |
| 1239 | ENTER(); |
| 1240 | |
| 1241 | ret = register_filesystem(&ffs_fs_type); |
| 1242 | if (likely(!ret)) |
| 1243 | FINFO("file system registered"); |
| 1244 | else |
| 1245 | FERR("failed registering file system (%d)", ret); |
| 1246 | |
| 1247 | return ret; |
| 1248 | } |
| 1249 | |
| 1250 | static void functionfs_cleanup(void) |
| 1251 | { |
| 1252 | ENTER(); |
| 1253 | |
| 1254 | FINFO("unloading"); |
| 1255 | unregister_filesystem(&ffs_fs_type); |
| 1256 | } |
| 1257 | |
| 1258 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1259 | /* ffs_data and ffs_function construction and destruction code **************/ |
| 1260 | |
| 1261 | static void ffs_data_clear(struct ffs_data *ffs); |
| 1262 | static void ffs_data_reset(struct ffs_data *ffs); |
| 1263 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1264 | static void ffs_data_get(struct ffs_data *ffs) |
| 1265 | { |
| 1266 | ENTER(); |
| 1267 | |
| 1268 | atomic_inc(&ffs->ref); |
| 1269 | } |
| 1270 | |
| 1271 | static void ffs_data_opened(struct ffs_data *ffs) |
| 1272 | { |
| 1273 | ENTER(); |
| 1274 | |
| 1275 | atomic_inc(&ffs->ref); |
| 1276 | atomic_inc(&ffs->opened); |
| 1277 | } |
| 1278 | |
| 1279 | static void ffs_data_put(struct ffs_data *ffs) |
| 1280 | { |
| 1281 | ENTER(); |
| 1282 | |
| 1283 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { |
| 1284 | FINFO("%s(): freeing", __func__); |
| 1285 | ffs_data_clear(ffs); |
| 1286 | BUG_ON(mutex_is_locked(&ffs->mutex) || |
| 1287 | spin_is_locked(&ffs->ev.waitq.lock) || |
| 1288 | waitqueue_active(&ffs->ev.waitq) || |
| 1289 | waitqueue_active(&ffs->ep0req_completion.wait)); |
| 1290 | kfree(ffs); |
| 1291 | } |
| 1292 | } |
| 1293 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 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 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1306 | static struct ffs_data *ffs_data_new(void) |
| 1307 | { |
| 1308 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); |
| 1309 | if (unlikely(!ffs)) |
| 1310 | return 0; |
| 1311 | |
| 1312 | ENTER(); |
| 1313 | |
| 1314 | atomic_set(&ffs->ref, 1); |
| 1315 | atomic_set(&ffs->opened, 0); |
| 1316 | ffs->state = FFS_READ_DESCRIPTORS; |
| 1317 | mutex_init(&ffs->mutex); |
| 1318 | spin_lock_init(&ffs->eps_lock); |
| 1319 | init_waitqueue_head(&ffs->ev.waitq); |
| 1320 | init_completion(&ffs->ep0req_completion); |
| 1321 | |
| 1322 | /* XXX REVISIT need to update it in some places, or do we? */ |
| 1323 | ffs->ev.can_stall = 1; |
| 1324 | |
| 1325 | return ffs; |
| 1326 | } |
| 1327 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1328 | static void ffs_data_clear(struct ffs_data *ffs) |
| 1329 | { |
| 1330 | ENTER(); |
| 1331 | |
| 1332 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) |
| 1333 | functionfs_closed_callback(ffs); |
| 1334 | |
| 1335 | BUG_ON(ffs->gadget); |
| 1336 | |
| 1337 | if (ffs->epfiles) |
| 1338 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); |
| 1339 | |
| 1340 | kfree(ffs->raw_descs); |
| 1341 | kfree(ffs->raw_strings); |
| 1342 | kfree(ffs->stringtabs); |
| 1343 | } |
| 1344 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1345 | static void ffs_data_reset(struct ffs_data *ffs) |
| 1346 | { |
| 1347 | ENTER(); |
| 1348 | |
| 1349 | ffs_data_clear(ffs); |
| 1350 | |
| 1351 | ffs->epfiles = NULL; |
| 1352 | ffs->raw_descs = NULL; |
| 1353 | ffs->raw_strings = NULL; |
| 1354 | ffs->stringtabs = NULL; |
| 1355 | |
| 1356 | ffs->raw_descs_length = 0; |
| 1357 | ffs->raw_fs_descs_length = 0; |
| 1358 | ffs->fs_descs_count = 0; |
| 1359 | ffs->hs_descs_count = 0; |
| 1360 | |
| 1361 | ffs->strings_count = 0; |
| 1362 | ffs->interfaces_count = 0; |
| 1363 | ffs->eps_count = 0; |
| 1364 | |
| 1365 | ffs->ev.count = 0; |
| 1366 | |
| 1367 | ffs->state = FFS_READ_DESCRIPTORS; |
| 1368 | ffs->setup_state = FFS_NO_SETUP; |
| 1369 | ffs->flags = 0; |
| 1370 | } |
| 1371 | |
| 1372 | |
| 1373 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) |
| 1374 | { |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1375 | struct usb_gadget_strings **lang; |
| 1376 | int first_id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1377 | |
| 1378 | ENTER(); |
| 1379 | |
| 1380 | if (WARN_ON(ffs->state != FFS_ACTIVE |
| 1381 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) |
| 1382 | return -EBADFD; |
| 1383 | |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1384 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
| 1385 | if (unlikely(first_id < 0)) |
| 1386 | return first_id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1387 | |
| 1388 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); |
| 1389 | if (unlikely(!ffs->ep0req)) |
| 1390 | return -ENOMEM; |
| 1391 | ffs->ep0req->complete = ffs_ep0_complete; |
| 1392 | ffs->ep0req->context = ffs; |
| 1393 | |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1394 | lang = ffs->stringtabs; |
| 1395 | for (lang = ffs->stringtabs; *lang; ++lang) { |
| 1396 | struct usb_string *str = (*lang)->strings; |
| 1397 | int id = first_id; |
| 1398 | for (; str->s; ++id, ++str) |
| 1399 | str->id = id; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1400 | } |
| 1401 | |
| 1402 | ffs->gadget = cdev->gadget; |
Michal Nazarewicz | fd7c9a0 | 2010-06-16 12:08:00 +0200 | [diff] [blame] | 1403 | ffs_data_get(ffs); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1404 | return 0; |
| 1405 | } |
| 1406 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1407 | static void functionfs_unbind(struct ffs_data *ffs) |
| 1408 | { |
| 1409 | ENTER(); |
| 1410 | |
| 1411 | if (!WARN_ON(!ffs->gadget)) { |
| 1412 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); |
| 1413 | ffs->ep0req = NULL; |
| 1414 | ffs->gadget = NULL; |
| 1415 | ffs_data_put(ffs); |
| 1416 | } |
| 1417 | } |
| 1418 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1419 | static int ffs_epfiles_create(struct ffs_data *ffs) |
| 1420 | { |
| 1421 | struct ffs_epfile *epfile, *epfiles; |
| 1422 | unsigned i, count; |
| 1423 | |
| 1424 | ENTER(); |
| 1425 | |
| 1426 | count = ffs->eps_count; |
| 1427 | epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL); |
| 1428 | if (!epfiles) |
| 1429 | return -ENOMEM; |
| 1430 | |
| 1431 | epfile = epfiles; |
| 1432 | for (i = 1; i <= count; ++i, ++epfile) { |
| 1433 | epfile->ffs = ffs; |
| 1434 | mutex_init(&epfile->mutex); |
| 1435 | init_waitqueue_head(&epfile->wait); |
| 1436 | sprintf(epfiles->name, "ep%u", i); |
| 1437 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, |
| 1438 | &ffs_epfile_operations, |
| 1439 | &epfile->dentry))) { |
| 1440 | ffs_epfiles_destroy(epfiles, i - 1); |
| 1441 | return -ENOMEM; |
| 1442 | } |
| 1443 | } |
| 1444 | |
| 1445 | ffs->epfiles = epfiles; |
| 1446 | return 0; |
| 1447 | } |
| 1448 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1449 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
| 1450 | { |
| 1451 | struct ffs_epfile *epfile = epfiles; |
| 1452 | |
| 1453 | ENTER(); |
| 1454 | |
| 1455 | for (; count; --count, ++epfile) { |
| 1456 | BUG_ON(mutex_is_locked(&epfile->mutex) || |
| 1457 | waitqueue_active(&epfile->wait)); |
| 1458 | if (epfile->dentry) { |
| 1459 | d_delete(epfile->dentry); |
| 1460 | dput(epfile->dentry); |
| 1461 | epfile->dentry = NULL; |
| 1462 | } |
| 1463 | } |
| 1464 | |
| 1465 | kfree(epfiles); |
| 1466 | } |
| 1467 | |
Michal Nazarewicz | 7898aee | 2010-06-16 12:07:58 +0200 | [diff] [blame] | 1468 | static int functionfs_bind_config(struct usb_composite_dev *cdev, |
| 1469 | struct usb_configuration *c, |
| 1470 | struct ffs_data *ffs) |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1471 | { |
| 1472 | struct ffs_function *func; |
| 1473 | int ret; |
| 1474 | |
| 1475 | ENTER(); |
| 1476 | |
| 1477 | func = kzalloc(sizeof *func, GFP_KERNEL); |
| 1478 | if (unlikely(!func)) |
| 1479 | return -ENOMEM; |
| 1480 | |
| 1481 | func->function.name = "Function FS Gadget"; |
| 1482 | func->function.strings = ffs->stringtabs; |
| 1483 | |
| 1484 | func->function.bind = ffs_func_bind; |
| 1485 | func->function.unbind = ffs_func_unbind; |
| 1486 | func->function.set_alt = ffs_func_set_alt; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1487 | func->function.disable = ffs_func_disable; |
| 1488 | func->function.setup = ffs_func_setup; |
| 1489 | func->function.suspend = ffs_func_suspend; |
| 1490 | func->function.resume = ffs_func_resume; |
| 1491 | |
| 1492 | func->conf = c; |
| 1493 | func->gadget = cdev->gadget; |
| 1494 | func->ffs = ffs; |
| 1495 | ffs_data_get(ffs); |
| 1496 | |
| 1497 | ret = usb_add_function(c, &func->function); |
| 1498 | if (unlikely(ret)) |
| 1499 | ffs_func_free(func); |
| 1500 | |
| 1501 | return ret; |
| 1502 | } |
| 1503 | |
| 1504 | static void ffs_func_free(struct ffs_function *func) |
| 1505 | { |
| 1506 | ENTER(); |
| 1507 | |
| 1508 | ffs_data_put(func->ffs); |
| 1509 | |
| 1510 | kfree(func->eps); |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1511 | /* |
| 1512 | * eps and interfaces_nums are allocated in the same chunk so |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1513 | * only one free is required. Descriptors are also allocated |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1514 | * in the same chunk. |
| 1515 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1516 | |
| 1517 | kfree(func); |
| 1518 | } |
| 1519 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1520 | static void ffs_func_eps_disable(struct ffs_function *func) |
| 1521 | { |
| 1522 | struct ffs_ep *ep = func->eps; |
| 1523 | struct ffs_epfile *epfile = func->ffs->epfiles; |
| 1524 | unsigned count = func->ffs->eps_count; |
| 1525 | unsigned long flags; |
| 1526 | |
| 1527 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
| 1528 | do { |
| 1529 | /* pending requests get nuked */ |
| 1530 | if (likely(ep->ep)) |
| 1531 | usb_ep_disable(ep->ep); |
| 1532 | epfile->ep = NULL; |
| 1533 | |
| 1534 | ++ep; |
| 1535 | ++epfile; |
| 1536 | } while (--count); |
| 1537 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
| 1538 | } |
| 1539 | |
| 1540 | static int ffs_func_eps_enable(struct ffs_function *func) |
| 1541 | { |
| 1542 | struct ffs_data *ffs = func->ffs; |
| 1543 | struct ffs_ep *ep = func->eps; |
| 1544 | struct ffs_epfile *epfile = ffs->epfiles; |
| 1545 | unsigned count = ffs->eps_count; |
| 1546 | unsigned long flags; |
| 1547 | int ret = 0; |
| 1548 | |
| 1549 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
| 1550 | do { |
| 1551 | struct usb_endpoint_descriptor *ds; |
| 1552 | ds = ep->descs[ep->descs[1] ? 1 : 0]; |
| 1553 | |
| 1554 | ep->ep->driver_data = ep; |
| 1555 | ret = usb_ep_enable(ep->ep, ds); |
| 1556 | if (likely(!ret)) { |
| 1557 | epfile->ep = ep; |
| 1558 | epfile->in = usb_endpoint_dir_in(ds); |
| 1559 | epfile->isoc = usb_endpoint_xfer_isoc(ds); |
| 1560 | } else { |
| 1561 | break; |
| 1562 | } |
| 1563 | |
| 1564 | wake_up(&epfile->wait); |
| 1565 | |
| 1566 | ++ep; |
| 1567 | ++epfile; |
| 1568 | } while (--count); |
| 1569 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
| 1570 | |
| 1571 | return ret; |
| 1572 | } |
| 1573 | |
| 1574 | |
| 1575 | /* Parsing and building descriptors and strings *****************************/ |
| 1576 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1577 | /* |
| 1578 | * This validates if data pointed by data is a valid USB descriptor as |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1579 | * well as record how many interfaces, endpoints and strings are |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1580 | * required by given configuration. Returns address after the |
| 1581 | * descriptor or NULL if data is invalid. |
| 1582 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1583 | |
| 1584 | enum ffs_entity_type { |
| 1585 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT |
| 1586 | }; |
| 1587 | |
| 1588 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
| 1589 | u8 *valuep, |
| 1590 | struct usb_descriptor_header *desc, |
| 1591 | void *priv); |
| 1592 | |
| 1593 | static int __must_check ffs_do_desc(char *data, unsigned len, |
| 1594 | ffs_entity_callback entity, void *priv) |
| 1595 | { |
| 1596 | struct usb_descriptor_header *_ds = (void *)data; |
| 1597 | u8 length; |
| 1598 | int ret; |
| 1599 | |
| 1600 | ENTER(); |
| 1601 | |
| 1602 | /* At least two bytes are required: length and type */ |
| 1603 | if (len < 2) { |
| 1604 | FVDBG("descriptor too short"); |
| 1605 | return -EINVAL; |
| 1606 | } |
| 1607 | |
| 1608 | /* If we have at least as many bytes as the descriptor takes? */ |
| 1609 | length = _ds->bLength; |
| 1610 | if (len < length) { |
| 1611 | FVDBG("descriptor longer then available data"); |
| 1612 | return -EINVAL; |
| 1613 | } |
| 1614 | |
| 1615 | #define __entity_check_INTERFACE(val) 1 |
| 1616 | #define __entity_check_STRING(val) (val) |
| 1617 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) |
| 1618 | #define __entity(type, val) do { \ |
| 1619 | FVDBG("entity " #type "(%02x)", (val)); \ |
| 1620 | if (unlikely(!__entity_check_ ##type(val))) { \ |
| 1621 | FVDBG("invalid entity's value"); \ |
| 1622 | return -EINVAL; \ |
| 1623 | } \ |
| 1624 | ret = entity(FFS_ ##type, &val, _ds, priv); \ |
| 1625 | if (unlikely(ret < 0)) { \ |
| 1626 | FDBG("entity " #type "(%02x); ret = %d", \ |
| 1627 | (val), ret); \ |
| 1628 | return ret; \ |
| 1629 | } \ |
| 1630 | } while (0) |
| 1631 | |
| 1632 | /* Parse descriptor depending on type. */ |
| 1633 | switch (_ds->bDescriptorType) { |
| 1634 | case USB_DT_DEVICE: |
| 1635 | case USB_DT_CONFIG: |
| 1636 | case USB_DT_STRING: |
| 1637 | case USB_DT_DEVICE_QUALIFIER: |
| 1638 | /* function can't have any of those */ |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1639 | FVDBG("descriptor reserved for gadget: %d", |
| 1640 | _ds->bDescriptorType); |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1641 | return -EINVAL; |
| 1642 | |
| 1643 | case USB_DT_INTERFACE: { |
| 1644 | struct usb_interface_descriptor *ds = (void *)_ds; |
| 1645 | FVDBG("interface descriptor"); |
| 1646 | if (length != sizeof *ds) |
| 1647 | goto inv_length; |
| 1648 | |
| 1649 | __entity(INTERFACE, ds->bInterfaceNumber); |
| 1650 | if (ds->iInterface) |
| 1651 | __entity(STRING, ds->iInterface); |
| 1652 | } |
| 1653 | break; |
| 1654 | |
| 1655 | case USB_DT_ENDPOINT: { |
| 1656 | struct usb_endpoint_descriptor *ds = (void *)_ds; |
| 1657 | FVDBG("endpoint descriptor"); |
| 1658 | if (length != USB_DT_ENDPOINT_SIZE && |
| 1659 | length != USB_DT_ENDPOINT_AUDIO_SIZE) |
| 1660 | goto inv_length; |
| 1661 | __entity(ENDPOINT, ds->bEndpointAddress); |
| 1662 | } |
| 1663 | break; |
| 1664 | |
| 1665 | case USB_DT_OTG: |
| 1666 | if (length != sizeof(struct usb_otg_descriptor)) |
| 1667 | goto inv_length; |
| 1668 | break; |
| 1669 | |
| 1670 | case USB_DT_INTERFACE_ASSOCIATION: { |
| 1671 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; |
| 1672 | FVDBG("interface association descriptor"); |
| 1673 | if (length != sizeof *ds) |
| 1674 | goto inv_length; |
| 1675 | if (ds->iFunction) |
| 1676 | __entity(STRING, ds->iFunction); |
| 1677 | } |
| 1678 | break; |
| 1679 | |
| 1680 | case USB_DT_OTHER_SPEED_CONFIG: |
| 1681 | case USB_DT_INTERFACE_POWER: |
| 1682 | case USB_DT_DEBUG: |
| 1683 | case USB_DT_SECURITY: |
| 1684 | case USB_DT_CS_RADIO_CONTROL: |
| 1685 | /* TODO */ |
| 1686 | FVDBG("unimplemented descriptor: %d", _ds->bDescriptorType); |
| 1687 | return -EINVAL; |
| 1688 | |
| 1689 | default: |
| 1690 | /* We should never be here */ |
| 1691 | FVDBG("unknown descriptor: %d", _ds->bDescriptorType); |
| 1692 | return -EINVAL; |
| 1693 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1694 | inv_length: |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1695 | FVDBG("invalid length: %d (descriptor %d)", |
| 1696 | _ds->bLength, _ds->bDescriptorType); |
| 1697 | return -EINVAL; |
| 1698 | } |
| 1699 | |
| 1700 | #undef __entity |
| 1701 | #undef __entity_check_DESCRIPTOR |
| 1702 | #undef __entity_check_INTERFACE |
| 1703 | #undef __entity_check_STRING |
| 1704 | #undef __entity_check_ENDPOINT |
| 1705 | |
| 1706 | return length; |
| 1707 | } |
| 1708 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1709 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
| 1710 | ffs_entity_callback entity, void *priv) |
| 1711 | { |
| 1712 | const unsigned _len = len; |
| 1713 | unsigned long num = 0; |
| 1714 | |
| 1715 | ENTER(); |
| 1716 | |
| 1717 | for (;;) { |
| 1718 | int ret; |
| 1719 | |
| 1720 | if (num == count) |
| 1721 | data = NULL; |
| 1722 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1723 | /* Record "descriptor" entity */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1724 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
| 1725 | if (unlikely(ret < 0)) { |
| 1726 | FDBG("entity DESCRIPTOR(%02lx); ret = %d", num, ret); |
| 1727 | return ret; |
| 1728 | } |
| 1729 | |
| 1730 | if (!data) |
| 1731 | return _len - len; |
| 1732 | |
| 1733 | ret = ffs_do_desc(data, len, entity, priv); |
| 1734 | if (unlikely(ret < 0)) { |
| 1735 | FDBG("%s returns %d", __func__, ret); |
| 1736 | return ret; |
| 1737 | } |
| 1738 | |
| 1739 | len -= ret; |
| 1740 | data += ret; |
| 1741 | ++num; |
| 1742 | } |
| 1743 | } |
| 1744 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1745 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
| 1746 | u8 *valuep, struct usb_descriptor_header *desc, |
| 1747 | void *priv) |
| 1748 | { |
| 1749 | struct ffs_data *ffs = priv; |
| 1750 | |
| 1751 | ENTER(); |
| 1752 | |
| 1753 | switch (type) { |
| 1754 | case FFS_DESCRIPTOR: |
| 1755 | break; |
| 1756 | |
| 1757 | case FFS_INTERFACE: |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1758 | /* |
| 1759 | * Interfaces are indexed from zero so if we |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1760 | * encountered interface "n" then there are at least |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1761 | * "n+1" interfaces. |
| 1762 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1763 | if (*valuep >= ffs->interfaces_count) |
| 1764 | ffs->interfaces_count = *valuep + 1; |
| 1765 | break; |
| 1766 | |
| 1767 | case FFS_STRING: |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1768 | /* |
| 1769 | * Strings are indexed from 1 (0 is magic ;) reserved |
| 1770 | * for languages list or some such) |
| 1771 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1772 | if (*valuep > ffs->strings_count) |
| 1773 | ffs->strings_count = *valuep; |
| 1774 | break; |
| 1775 | |
| 1776 | case FFS_ENDPOINT: |
| 1777 | /* Endpoints are indexed from 1 as well. */ |
| 1778 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) |
| 1779 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); |
| 1780 | break; |
| 1781 | } |
| 1782 | |
| 1783 | return 0; |
| 1784 | } |
| 1785 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1786 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
| 1787 | char *const _data, size_t len) |
| 1788 | { |
| 1789 | unsigned fs_count, hs_count; |
| 1790 | int fs_len, ret = -EINVAL; |
| 1791 | char *data = _data; |
| 1792 | |
| 1793 | ENTER(); |
| 1794 | |
| 1795 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC || |
| 1796 | get_unaligned_le32(data + 4) != len)) |
| 1797 | goto error; |
| 1798 | fs_count = get_unaligned_le32(data + 8); |
| 1799 | hs_count = get_unaligned_le32(data + 12); |
| 1800 | |
| 1801 | if (!fs_count && !hs_count) |
| 1802 | goto einval; |
| 1803 | |
| 1804 | data += 16; |
| 1805 | len -= 16; |
| 1806 | |
| 1807 | if (likely(fs_count)) { |
| 1808 | fs_len = ffs_do_descs(fs_count, data, len, |
| 1809 | __ffs_data_do_entity, ffs); |
| 1810 | if (unlikely(fs_len < 0)) { |
| 1811 | ret = fs_len; |
| 1812 | goto error; |
| 1813 | } |
| 1814 | |
| 1815 | data += fs_len; |
| 1816 | len -= fs_len; |
| 1817 | } else { |
| 1818 | fs_len = 0; |
| 1819 | } |
| 1820 | |
| 1821 | if (likely(hs_count)) { |
| 1822 | ret = ffs_do_descs(hs_count, data, len, |
| 1823 | __ffs_data_do_entity, ffs); |
| 1824 | if (unlikely(ret < 0)) |
| 1825 | goto error; |
| 1826 | } else { |
| 1827 | ret = 0; |
| 1828 | } |
| 1829 | |
| 1830 | if (unlikely(len != ret)) |
| 1831 | goto einval; |
| 1832 | |
| 1833 | ffs->raw_fs_descs_length = fs_len; |
| 1834 | ffs->raw_descs_length = fs_len + ret; |
| 1835 | ffs->raw_descs = _data; |
| 1836 | ffs->fs_descs_count = fs_count; |
| 1837 | ffs->hs_descs_count = hs_count; |
| 1838 | |
| 1839 | return 0; |
| 1840 | |
| 1841 | einval: |
| 1842 | ret = -EINVAL; |
| 1843 | error: |
| 1844 | kfree(_data); |
| 1845 | return ret; |
| 1846 | } |
| 1847 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1848 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
| 1849 | char *const _data, size_t len) |
| 1850 | { |
| 1851 | u32 str_count, needed_count, lang_count; |
| 1852 | struct usb_gadget_strings **stringtabs, *t; |
| 1853 | struct usb_string *strings, *s; |
| 1854 | const char *data = _data; |
| 1855 | |
| 1856 | ENTER(); |
| 1857 | |
| 1858 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || |
| 1859 | get_unaligned_le32(data + 4) != len)) |
| 1860 | goto error; |
| 1861 | str_count = get_unaligned_le32(data + 8); |
| 1862 | lang_count = get_unaligned_le32(data + 12); |
| 1863 | |
| 1864 | /* if one is zero the other must be zero */ |
| 1865 | if (unlikely(!str_count != !lang_count)) |
| 1866 | goto error; |
| 1867 | |
| 1868 | /* Do we have at least as many strings as descriptors need? */ |
| 1869 | needed_count = ffs->strings_count; |
| 1870 | if (unlikely(str_count < needed_count)) |
| 1871 | goto error; |
| 1872 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1873 | /* |
| 1874 | * If we don't need any strings just return and free all |
| 1875 | * memory. |
| 1876 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1877 | if (!needed_count) { |
| 1878 | kfree(_data); |
| 1879 | return 0; |
| 1880 | } |
| 1881 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1882 | /* Allocate everything in one chunk so there's less maintenance. */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1883 | { |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1884 | struct { |
| 1885 | struct usb_gadget_strings *stringtabs[lang_count + 1]; |
| 1886 | struct usb_gadget_strings stringtab[lang_count]; |
| 1887 | struct usb_string strings[lang_count*(needed_count+1)]; |
| 1888 | } *d; |
| 1889 | unsigned i = 0; |
| 1890 | |
| 1891 | d = kmalloc(sizeof *d, GFP_KERNEL); |
| 1892 | if (unlikely(!d)) { |
| 1893 | kfree(_data); |
| 1894 | return -ENOMEM; |
| 1895 | } |
| 1896 | |
| 1897 | stringtabs = d->stringtabs; |
| 1898 | t = d->stringtab; |
| 1899 | i = lang_count; |
| 1900 | do { |
| 1901 | *stringtabs++ = t++; |
| 1902 | } while (--i); |
| 1903 | *stringtabs = NULL; |
| 1904 | |
| 1905 | stringtabs = d->stringtabs; |
| 1906 | t = d->stringtab; |
| 1907 | s = d->strings; |
| 1908 | strings = s; |
| 1909 | } |
| 1910 | |
| 1911 | /* For each language */ |
| 1912 | data += 16; |
| 1913 | len -= 16; |
| 1914 | |
| 1915 | do { /* lang_count > 0 so we can use do-while */ |
| 1916 | unsigned needed = needed_count; |
| 1917 | |
| 1918 | if (unlikely(len < 3)) |
| 1919 | goto error_free; |
| 1920 | t->language = get_unaligned_le16(data); |
| 1921 | t->strings = s; |
| 1922 | ++t; |
| 1923 | |
| 1924 | data += 2; |
| 1925 | len -= 2; |
| 1926 | |
| 1927 | /* For each string */ |
| 1928 | do { /* str_count > 0 so we can use do-while */ |
| 1929 | size_t length = strnlen(data, len); |
| 1930 | |
| 1931 | if (unlikely(length == len)) |
| 1932 | goto error_free; |
| 1933 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1934 | /* |
| 1935 | * User may provide more strings then we need, |
| 1936 | * if that's the case we simply ignore the |
| 1937 | * rest |
| 1938 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1939 | if (likely(needed)) { |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1940 | /* |
| 1941 | * s->id will be set while adding |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1942 | * function to configuration so for |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1943 | * now just leave garbage here. |
| 1944 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1945 | s->s = data; |
| 1946 | --needed; |
| 1947 | ++s; |
| 1948 | } |
| 1949 | |
| 1950 | data += length + 1; |
| 1951 | len -= length + 1; |
| 1952 | } while (--str_count); |
| 1953 | |
| 1954 | s->id = 0; /* terminator */ |
| 1955 | s->s = NULL; |
| 1956 | ++s; |
| 1957 | |
| 1958 | } while (--lang_count); |
| 1959 | |
| 1960 | /* Some garbage left? */ |
| 1961 | if (unlikely(len)) |
| 1962 | goto error_free; |
| 1963 | |
| 1964 | /* Done! */ |
| 1965 | ffs->stringtabs = stringtabs; |
| 1966 | ffs->raw_strings = _data; |
| 1967 | |
| 1968 | return 0; |
| 1969 | |
| 1970 | error_free: |
| 1971 | kfree(stringtabs); |
| 1972 | error: |
| 1973 | kfree(_data); |
| 1974 | return -EINVAL; |
| 1975 | } |
| 1976 | |
| 1977 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1978 | /* Events handling and management *******************************************/ |
| 1979 | |
| 1980 | static void __ffs_event_add(struct ffs_data *ffs, |
| 1981 | enum usb_functionfs_event_type type) |
| 1982 | { |
| 1983 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; |
| 1984 | int neg = 0; |
| 1985 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1986 | /* |
| 1987 | * Abort any unhandled setup |
| 1988 | * |
| 1989 | * We do not need to worry about some cmpxchg() changing value |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1990 | * of ffs->setup_state without holding the lock because when |
| 1991 | * state is FFS_SETUP_PENDING cmpxchg() in several places in |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 1992 | * the source does nothing. |
| 1993 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 1994 | if (ffs->setup_state == FFS_SETUP_PENDING) |
| 1995 | ffs->setup_state = FFS_SETUP_CANCELED; |
| 1996 | |
| 1997 | switch (type) { |
| 1998 | case FUNCTIONFS_RESUME: |
| 1999 | rem_type2 = FUNCTIONFS_SUSPEND; |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2000 | /* FALL THROUGH */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2001 | case FUNCTIONFS_SUSPEND: |
| 2002 | case FUNCTIONFS_SETUP: |
| 2003 | rem_type1 = type; |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2004 | /* Discard all similar events */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2005 | break; |
| 2006 | |
| 2007 | case FUNCTIONFS_BIND: |
| 2008 | case FUNCTIONFS_UNBIND: |
| 2009 | case FUNCTIONFS_DISABLE: |
| 2010 | case FUNCTIONFS_ENABLE: |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2011 | /* Discard everything other then power management. */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2012 | rem_type1 = FUNCTIONFS_SUSPEND; |
| 2013 | rem_type2 = FUNCTIONFS_RESUME; |
| 2014 | neg = 1; |
| 2015 | break; |
| 2016 | |
| 2017 | default: |
| 2018 | BUG(); |
| 2019 | } |
| 2020 | |
| 2021 | { |
| 2022 | u8 *ev = ffs->ev.types, *out = ev; |
| 2023 | unsigned n = ffs->ev.count; |
| 2024 | for (; n; --n, ++ev) |
| 2025 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) |
| 2026 | *out++ = *ev; |
| 2027 | else |
| 2028 | FVDBG("purging event %d", *ev); |
| 2029 | ffs->ev.count = out - ffs->ev.types; |
| 2030 | } |
| 2031 | |
| 2032 | FVDBG("adding event %d", type); |
| 2033 | ffs->ev.types[ffs->ev.count++] = type; |
| 2034 | wake_up_locked(&ffs->ev.waitq); |
| 2035 | } |
| 2036 | |
| 2037 | static void ffs_event_add(struct ffs_data *ffs, |
| 2038 | enum usb_functionfs_event_type type) |
| 2039 | { |
| 2040 | unsigned long flags; |
| 2041 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); |
| 2042 | __ffs_event_add(ffs, type); |
| 2043 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); |
| 2044 | } |
| 2045 | |
| 2046 | |
| 2047 | /* Bind/unbind USB function hooks *******************************************/ |
| 2048 | |
| 2049 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
| 2050 | struct usb_descriptor_header *desc, |
| 2051 | void *priv) |
| 2052 | { |
| 2053 | struct usb_endpoint_descriptor *ds = (void *)desc; |
| 2054 | struct ffs_function *func = priv; |
| 2055 | struct ffs_ep *ffs_ep; |
| 2056 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2057 | /* |
| 2058 | * If hs_descriptors is not NULL then we are reading hs |
| 2059 | * descriptors now |
| 2060 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2061 | const int isHS = func->function.hs_descriptors != NULL; |
| 2062 | unsigned idx; |
| 2063 | |
| 2064 | if (type != FFS_DESCRIPTOR) |
| 2065 | return 0; |
| 2066 | |
| 2067 | if (isHS) |
| 2068 | func->function.hs_descriptors[(long)valuep] = desc; |
| 2069 | else |
| 2070 | func->function.descriptors[(long)valuep] = desc; |
| 2071 | |
| 2072 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) |
| 2073 | return 0; |
| 2074 | |
| 2075 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; |
| 2076 | ffs_ep = func->eps + idx; |
| 2077 | |
| 2078 | if (unlikely(ffs_ep->descs[isHS])) { |
| 2079 | FVDBG("two %sspeed descriptors for EP %d", |
| 2080 | isHS ? "high" : "full", |
| 2081 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 2082 | return -EINVAL; |
| 2083 | } |
| 2084 | ffs_ep->descs[isHS] = ds; |
| 2085 | |
| 2086 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); |
| 2087 | if (ffs_ep->ep) { |
| 2088 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; |
| 2089 | if (!ds->wMaxPacketSize) |
| 2090 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; |
| 2091 | } else { |
| 2092 | struct usb_request *req; |
| 2093 | struct usb_ep *ep; |
| 2094 | |
| 2095 | FVDBG("autoconfig"); |
| 2096 | ep = usb_ep_autoconfig(func->gadget, ds); |
| 2097 | if (unlikely(!ep)) |
| 2098 | return -ENOTSUPP; |
Joe Perches | cc7e605 | 2010-11-14 19:04:49 -0800 | [diff] [blame] | 2099 | ep->driver_data = func->eps + idx; |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2100 | |
| 2101 | req = usb_ep_alloc_request(ep, GFP_KERNEL); |
| 2102 | if (unlikely(!req)) |
| 2103 | return -ENOMEM; |
| 2104 | |
| 2105 | ffs_ep->ep = ep; |
| 2106 | ffs_ep->req = req; |
| 2107 | func->eps_revmap[ds->bEndpointAddress & |
| 2108 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; |
| 2109 | } |
| 2110 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); |
| 2111 | |
| 2112 | return 0; |
| 2113 | } |
| 2114 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 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: |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2146 | /* |
| 2147 | * USB_DT_ENDPOINT are handled in |
| 2148 | * __ffs_func_bind_do_descs(). |
| 2149 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2150 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
| 2151 | return 0; |
| 2152 | |
| 2153 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; |
| 2154 | if (unlikely(!func->eps[idx].ep)) |
| 2155 | return -EINVAL; |
| 2156 | |
| 2157 | { |
| 2158 | struct usb_endpoint_descriptor **descs; |
| 2159 | descs = func->eps[idx].descs; |
| 2160 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; |
| 2161 | } |
| 2162 | break; |
| 2163 | } |
| 2164 | |
| 2165 | FVDBG("%02x -> %02x", *valuep, newValue); |
| 2166 | *valuep = newValue; |
| 2167 | return 0; |
| 2168 | } |
| 2169 | |
| 2170 | static int ffs_func_bind(struct usb_configuration *c, |
| 2171 | struct usb_function *f) |
| 2172 | { |
| 2173 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2174 | struct ffs_data *ffs = func->ffs; |
| 2175 | |
| 2176 | const int full = !!func->ffs->fs_descs_count; |
| 2177 | const int high = gadget_is_dualspeed(func->gadget) && |
| 2178 | func->ffs->hs_descs_count; |
| 2179 | |
| 2180 | int ret; |
| 2181 | |
| 2182 | /* Make it a single chunk, less management later on */ |
| 2183 | struct { |
| 2184 | struct ffs_ep eps[ffs->eps_count]; |
| 2185 | struct usb_descriptor_header |
| 2186 | *fs_descs[full ? ffs->fs_descs_count + 1 : 0]; |
| 2187 | struct usb_descriptor_header |
| 2188 | *hs_descs[high ? ffs->hs_descs_count + 1 : 0]; |
| 2189 | short inums[ffs->interfaces_count]; |
| 2190 | char raw_descs[high ? ffs->raw_descs_length |
| 2191 | : ffs->raw_fs_descs_length]; |
| 2192 | } *data; |
| 2193 | |
| 2194 | ENTER(); |
| 2195 | |
| 2196 | /* Only high speed but not supported by gadget? */ |
| 2197 | if (unlikely(!(full | high))) |
| 2198 | return -ENOTSUPP; |
| 2199 | |
| 2200 | /* Allocate */ |
| 2201 | data = kmalloc(sizeof *data, GFP_KERNEL); |
| 2202 | if (unlikely(!data)) |
| 2203 | return -ENOMEM; |
| 2204 | |
| 2205 | /* Zero */ |
| 2206 | memset(data->eps, 0, sizeof data->eps); |
| 2207 | memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs); |
| 2208 | memset(data->inums, 0xff, sizeof data->inums); |
| 2209 | for (ret = ffs->eps_count; ret; --ret) |
| 2210 | data->eps[ret].num = -1; |
| 2211 | |
| 2212 | /* Save pointers */ |
| 2213 | func->eps = data->eps; |
| 2214 | func->interfaces_nums = data->inums; |
| 2215 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2216 | /* |
| 2217 | * Go through all the endpoint descriptors and allocate |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2218 | * endpoints first, so that later we can rewrite the endpoint |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2219 | * numbers without worrying that it may be described later on. |
| 2220 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2221 | if (likely(full)) { |
| 2222 | func->function.descriptors = data->fs_descs; |
| 2223 | ret = ffs_do_descs(ffs->fs_descs_count, |
| 2224 | data->raw_descs, |
| 2225 | sizeof data->raw_descs, |
| 2226 | __ffs_func_bind_do_descs, func); |
| 2227 | if (unlikely(ret < 0)) |
| 2228 | goto error; |
| 2229 | } else { |
| 2230 | ret = 0; |
| 2231 | } |
| 2232 | |
| 2233 | if (likely(high)) { |
| 2234 | func->function.hs_descriptors = data->hs_descs; |
| 2235 | ret = ffs_do_descs(ffs->hs_descs_count, |
| 2236 | data->raw_descs + ret, |
| 2237 | (sizeof data->raw_descs) - ret, |
| 2238 | __ffs_func_bind_do_descs, func); |
| 2239 | } |
| 2240 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2241 | /* |
| 2242 | * Now handle interface numbers allocation and interface and |
| 2243 | * endpoint numbers rewriting. We can do that in one go |
| 2244 | * now. |
| 2245 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2246 | ret = ffs_do_descs(ffs->fs_descs_count + |
| 2247 | (high ? ffs->hs_descs_count : 0), |
| 2248 | data->raw_descs, sizeof data->raw_descs, |
| 2249 | __ffs_func_bind_do_nums, func); |
| 2250 | if (unlikely(ret < 0)) |
| 2251 | goto error; |
| 2252 | |
| 2253 | /* And we're done */ |
| 2254 | ffs_event_add(ffs, FUNCTIONFS_BIND); |
| 2255 | return 0; |
| 2256 | |
| 2257 | error: |
| 2258 | /* XXX Do we need to release all claimed endpoints here? */ |
| 2259 | return ret; |
| 2260 | } |
| 2261 | |
| 2262 | |
| 2263 | /* Other USB function hooks *************************************************/ |
| 2264 | |
| 2265 | static void ffs_func_unbind(struct usb_configuration *c, |
| 2266 | struct usb_function *f) |
| 2267 | { |
| 2268 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2269 | struct ffs_data *ffs = func->ffs; |
| 2270 | |
| 2271 | ENTER(); |
| 2272 | |
| 2273 | if (ffs->func == func) { |
| 2274 | ffs_func_eps_disable(func); |
| 2275 | ffs->func = NULL; |
| 2276 | } |
| 2277 | |
| 2278 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); |
| 2279 | |
| 2280 | ffs_func_free(func); |
| 2281 | } |
| 2282 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2283 | static int ffs_func_set_alt(struct usb_function *f, |
| 2284 | unsigned interface, unsigned alt) |
| 2285 | { |
| 2286 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2287 | struct ffs_data *ffs = func->ffs; |
| 2288 | int ret = 0, intf; |
| 2289 | |
| 2290 | if (alt != (unsigned)-1) { |
| 2291 | intf = ffs_func_revmap_intf(func, interface); |
| 2292 | if (unlikely(intf < 0)) |
| 2293 | return intf; |
| 2294 | } |
| 2295 | |
| 2296 | if (ffs->func) |
| 2297 | ffs_func_eps_disable(ffs->func); |
| 2298 | |
| 2299 | if (ffs->state != FFS_ACTIVE) |
| 2300 | return -ENODEV; |
| 2301 | |
| 2302 | if (alt == (unsigned)-1) { |
| 2303 | ffs->func = NULL; |
| 2304 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); |
| 2305 | return 0; |
| 2306 | } |
| 2307 | |
| 2308 | ffs->func = func; |
| 2309 | ret = ffs_func_eps_enable(func); |
| 2310 | if (likely(ret >= 0)) |
| 2311 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); |
| 2312 | return ret; |
| 2313 | } |
| 2314 | |
| 2315 | static void ffs_func_disable(struct usb_function *f) |
| 2316 | { |
| 2317 | ffs_func_set_alt(f, 0, (unsigned)-1); |
| 2318 | } |
| 2319 | |
| 2320 | static int ffs_func_setup(struct usb_function *f, |
| 2321 | const struct usb_ctrlrequest *creq) |
| 2322 | { |
| 2323 | struct ffs_function *func = ffs_func_from_usb(f); |
| 2324 | struct ffs_data *ffs = func->ffs; |
| 2325 | unsigned long flags; |
| 2326 | int ret; |
| 2327 | |
| 2328 | ENTER(); |
| 2329 | |
| 2330 | FVDBG("creq->bRequestType = %02x", creq->bRequestType); |
| 2331 | FVDBG("creq->bRequest = %02x", creq->bRequest); |
| 2332 | FVDBG("creq->wValue = %04x", le16_to_cpu(creq->wValue)); |
| 2333 | FVDBG("creq->wIndex = %04x", le16_to_cpu(creq->wIndex)); |
| 2334 | FVDBG("creq->wLength = %04x", le16_to_cpu(creq->wLength)); |
| 2335 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2336 | /* |
| 2337 | * Most requests directed to interface go through here |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2338 | * (notable exceptions are set/get interface) so we need to |
| 2339 | * handle them. All other either handled by composite or |
| 2340 | * passed to usb_configuration->setup() (if one is set). No |
| 2341 | * matter, we will handle requests directed to endpoint here |
| 2342 | * as well (as it's straightforward) but what to do with any |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2343 | * other request? |
| 2344 | */ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2345 | if (ffs->state != FFS_ACTIVE) |
| 2346 | return -ENODEV; |
| 2347 | |
| 2348 | switch (creq->bRequestType & USB_RECIP_MASK) { |
| 2349 | case USB_RECIP_INTERFACE: |
| 2350 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); |
| 2351 | if (unlikely(ret < 0)) |
| 2352 | return ret; |
| 2353 | break; |
| 2354 | |
| 2355 | case USB_RECIP_ENDPOINT: |
| 2356 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); |
| 2357 | if (unlikely(ret < 0)) |
| 2358 | return ret; |
| 2359 | break; |
| 2360 | |
| 2361 | default: |
| 2362 | return -EOPNOTSUPP; |
| 2363 | } |
| 2364 | |
| 2365 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); |
| 2366 | ffs->ev.setup = *creq; |
| 2367 | ffs->ev.setup.wIndex = cpu_to_le16(ret); |
| 2368 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); |
| 2369 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); |
| 2370 | |
| 2371 | return 0; |
| 2372 | } |
| 2373 | |
| 2374 | static void ffs_func_suspend(struct usb_function *f) |
| 2375 | { |
| 2376 | ENTER(); |
| 2377 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); |
| 2378 | } |
| 2379 | |
| 2380 | static void ffs_func_resume(struct usb_function *f) |
| 2381 | { |
| 2382 | ENTER(); |
| 2383 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); |
| 2384 | } |
| 2385 | |
| 2386 | |
Michal Nazarewicz | 5ab54cf | 2010-11-12 14:29:28 +0100 | [diff] [blame^] | 2387 | /* Endpoint and interface numbers reverse mapping ***************************/ |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2388 | |
| 2389 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) |
| 2390 | { |
| 2391 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; |
| 2392 | return num ? num : -EDOM; |
| 2393 | } |
| 2394 | |
| 2395 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) |
| 2396 | { |
| 2397 | short *nums = func->interfaces_nums; |
| 2398 | unsigned count = func->ffs->interfaces_count; |
| 2399 | |
| 2400 | for (; count; --count, ++nums) { |
| 2401 | if (*nums >= 0 && *nums == intf) |
| 2402 | return nums - func->interfaces_nums; |
| 2403 | } |
| 2404 | |
| 2405 | return -EDOM; |
| 2406 | } |
| 2407 | |
| 2408 | |
| 2409 | /* Misc helper functions ****************************************************/ |
| 2410 | |
| 2411 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) |
| 2412 | { |
| 2413 | return nonblock |
| 2414 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN |
| 2415 | : mutex_lock_interruptible(mutex); |
| 2416 | } |
| 2417 | |
Michal Nazarewicz | ddf8abd | 2010-05-05 12:53:14 +0200 | [diff] [blame] | 2418 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
| 2419 | { |
| 2420 | char *data; |
| 2421 | |
| 2422 | if (unlikely(!len)) |
| 2423 | return NULL; |
| 2424 | |
| 2425 | data = kmalloc(len, GFP_KERNEL); |
| 2426 | if (unlikely(!data)) |
| 2427 | return ERR_PTR(-ENOMEM); |
| 2428 | |
| 2429 | if (unlikely(__copy_from_user(data, buf, len))) { |
| 2430 | kfree(data); |
| 2431 | return ERR_PTR(-EFAULT); |
| 2432 | } |
| 2433 | |
| 2434 | FVDBG("Buffer from user space:"); |
| 2435 | ffs_dump_mem("", data, len); |
| 2436 | |
| 2437 | return data; |
| 2438 | } |