| 1 | /* |
| 2 | * Timers abstract layer |
| 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| 4 | * |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/time.h> |
| 26 | #include <linux/mutex.h> |
| 27 | #include <linux/device.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <sound/core.h> |
| 31 | #include <sound/timer.h> |
| 32 | #include <sound/control.h> |
| 33 | #include <sound/info.h> |
| 34 | #include <sound/minors.h> |
| 35 | #include <sound/initval.h> |
| 36 | #include <linux/kmod.h> |
| 37 | |
| 38 | #if IS_ENABLED(CONFIG_SND_HRTIMER) |
| 39 | #define DEFAULT_TIMER_LIMIT 4 |
| 40 | #elif IS_ENABLED(CONFIG_SND_RTCTIMER) |
| 41 | #define DEFAULT_TIMER_LIMIT 2 |
| 42 | #else |
| 43 | #define DEFAULT_TIMER_LIMIT 1 |
| 44 | #endif |
| 45 | |
| 46 | static int timer_limit = DEFAULT_TIMER_LIMIT; |
| 47 | static int timer_tstamp_monotonic = 1; |
| 48 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); |
| 49 | MODULE_DESCRIPTION("ALSA timer interface"); |
| 50 | MODULE_LICENSE("GPL"); |
| 51 | module_param(timer_limit, int, 0444); |
| 52 | MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); |
| 53 | module_param(timer_tstamp_monotonic, int, 0444); |
| 54 | MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); |
| 55 | |
| 56 | MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); |
| 57 | MODULE_ALIAS("devname:snd/timer"); |
| 58 | |
| 59 | struct snd_timer_user { |
| 60 | struct snd_timer_instance *timeri; |
| 61 | int tread; /* enhanced read with timestamps and events */ |
| 62 | unsigned long ticks; |
| 63 | unsigned long overrun; |
| 64 | int qhead; |
| 65 | int qtail; |
| 66 | int qused; |
| 67 | int queue_size; |
| 68 | struct snd_timer_read *queue; |
| 69 | struct snd_timer_tread *tqueue; |
| 70 | spinlock_t qlock; |
| 71 | unsigned long last_resolution; |
| 72 | unsigned int filter; |
| 73 | struct timespec tstamp; /* trigger tstamp */ |
| 74 | wait_queue_head_t qchange_sleep; |
| 75 | struct fasync_struct *fasync; |
| 76 | struct mutex tread_sem; |
| 77 | }; |
| 78 | |
| 79 | /* list of timers */ |
| 80 | static LIST_HEAD(snd_timer_list); |
| 81 | |
| 82 | /* list of slave instances */ |
| 83 | static LIST_HEAD(snd_timer_slave_list); |
| 84 | |
| 85 | /* lock for slave active lists */ |
| 86 | static DEFINE_SPINLOCK(slave_active_lock); |
| 87 | |
| 88 | static DEFINE_MUTEX(register_mutex); |
| 89 | |
| 90 | static int snd_timer_free(struct snd_timer *timer); |
| 91 | static int snd_timer_dev_free(struct snd_device *device); |
| 92 | static int snd_timer_dev_register(struct snd_device *device); |
| 93 | static int snd_timer_dev_disconnect(struct snd_device *device); |
| 94 | |
| 95 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); |
| 96 | |
| 97 | /* |
| 98 | * create a timer instance with the given owner string. |
| 99 | * when timer is not NULL, increments the module counter |
| 100 | */ |
| 101 | static struct snd_timer_instance *snd_timer_instance_new(char *owner, |
| 102 | struct snd_timer *timer) |
| 103 | { |
| 104 | struct snd_timer_instance *timeri; |
| 105 | timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); |
| 106 | if (timeri == NULL) |
| 107 | return NULL; |
| 108 | timeri->owner = kstrdup(owner, GFP_KERNEL); |
| 109 | if (! timeri->owner) { |
| 110 | kfree(timeri); |
| 111 | return NULL; |
| 112 | } |
| 113 | INIT_LIST_HEAD(&timeri->open_list); |
| 114 | INIT_LIST_HEAD(&timeri->active_list); |
| 115 | INIT_LIST_HEAD(&timeri->ack_list); |
| 116 | INIT_LIST_HEAD(&timeri->slave_list_head); |
| 117 | INIT_LIST_HEAD(&timeri->slave_active_head); |
| 118 | |
| 119 | timeri->timer = timer; |
| 120 | if (timer && !try_module_get(timer->module)) { |
| 121 | kfree(timeri->owner); |
| 122 | kfree(timeri); |
| 123 | return NULL; |
| 124 | } |
| 125 | |
| 126 | return timeri; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * find a timer instance from the given timer id |
| 131 | */ |
| 132 | static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) |
| 133 | { |
| 134 | struct snd_timer *timer = NULL; |
| 135 | |
| 136 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
| 137 | if (timer->tmr_class != tid->dev_class) |
| 138 | continue; |
| 139 | if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || |
| 140 | timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && |
| 141 | (timer->card == NULL || |
| 142 | timer->card->number != tid->card)) |
| 143 | continue; |
| 144 | if (timer->tmr_device != tid->device) |
| 145 | continue; |
| 146 | if (timer->tmr_subdevice != tid->subdevice) |
| 147 | continue; |
| 148 | return timer; |
| 149 | } |
| 150 | return NULL; |
| 151 | } |
| 152 | |
| 153 | #ifdef CONFIG_MODULES |
| 154 | |
| 155 | static void snd_timer_request(struct snd_timer_id *tid) |
| 156 | { |
| 157 | switch (tid->dev_class) { |
| 158 | case SNDRV_TIMER_CLASS_GLOBAL: |
| 159 | if (tid->device < timer_limit) |
| 160 | request_module("snd-timer-%i", tid->device); |
| 161 | break; |
| 162 | case SNDRV_TIMER_CLASS_CARD: |
| 163 | case SNDRV_TIMER_CLASS_PCM: |
| 164 | if (tid->card < snd_ecards_limit) |
| 165 | request_module("snd-card-%i", tid->card); |
| 166 | break; |
| 167 | default: |
| 168 | break; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | #endif |
| 173 | |
| 174 | /* |
| 175 | * look for a master instance matching with the slave id of the given slave. |
| 176 | * when found, relink the open_link of the slave. |
| 177 | * |
| 178 | * call this with register_mutex down. |
| 179 | */ |
| 180 | static void snd_timer_check_slave(struct snd_timer_instance *slave) |
| 181 | { |
| 182 | struct snd_timer *timer; |
| 183 | struct snd_timer_instance *master; |
| 184 | |
| 185 | /* FIXME: it's really dumb to look up all entries.. */ |
| 186 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
| 187 | list_for_each_entry(master, &timer->open_list_head, open_list) { |
| 188 | if (slave->slave_class == master->slave_class && |
| 189 | slave->slave_id == master->slave_id) { |
| 190 | list_move_tail(&slave->open_list, |
| 191 | &master->slave_list_head); |
| 192 | spin_lock_irq(&slave_active_lock); |
| 193 | slave->master = master; |
| 194 | slave->timer = master->timer; |
| 195 | spin_unlock_irq(&slave_active_lock); |
| 196 | return; |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * look for slave instances matching with the slave id of the given master. |
| 204 | * when found, relink the open_link of slaves. |
| 205 | * |
| 206 | * call this with register_mutex down. |
| 207 | */ |
| 208 | static void snd_timer_check_master(struct snd_timer_instance *master) |
| 209 | { |
| 210 | struct snd_timer_instance *slave, *tmp; |
| 211 | |
| 212 | /* check all pending slaves */ |
| 213 | list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { |
| 214 | if (slave->slave_class == master->slave_class && |
| 215 | slave->slave_id == master->slave_id) { |
| 216 | list_move_tail(&slave->open_list, &master->slave_list_head); |
| 217 | spin_lock_irq(&slave_active_lock); |
| 218 | slave->master = master; |
| 219 | slave->timer = master->timer; |
| 220 | if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) |
| 221 | list_add_tail(&slave->active_list, |
| 222 | &master->slave_active_head); |
| 223 | spin_unlock_irq(&slave_active_lock); |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * open a timer instance |
| 230 | * when opening a master, the slave id must be here given. |
| 231 | */ |
| 232 | int snd_timer_open(struct snd_timer_instance **ti, |
| 233 | char *owner, struct snd_timer_id *tid, |
| 234 | unsigned int slave_id) |
| 235 | { |
| 236 | struct snd_timer *timer; |
| 237 | struct snd_timer_instance *timeri = NULL; |
| 238 | |
| 239 | if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { |
| 240 | /* open a slave instance */ |
| 241 | if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || |
| 242 | tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { |
| 243 | pr_debug("ALSA: timer: invalid slave class %i\n", |
| 244 | tid->dev_sclass); |
| 245 | return -EINVAL; |
| 246 | } |
| 247 | mutex_lock(®ister_mutex); |
| 248 | timeri = snd_timer_instance_new(owner, NULL); |
| 249 | if (!timeri) { |
| 250 | mutex_unlock(®ister_mutex); |
| 251 | return -ENOMEM; |
| 252 | } |
| 253 | timeri->slave_class = tid->dev_sclass; |
| 254 | timeri->slave_id = tid->device; |
| 255 | timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; |
| 256 | list_add_tail(&timeri->open_list, &snd_timer_slave_list); |
| 257 | snd_timer_check_slave(timeri); |
| 258 | mutex_unlock(®ister_mutex); |
| 259 | *ti = timeri; |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | /* open a master instance */ |
| 264 | mutex_lock(®ister_mutex); |
| 265 | timer = snd_timer_find(tid); |
| 266 | #ifdef CONFIG_MODULES |
| 267 | if (!timer) { |
| 268 | mutex_unlock(®ister_mutex); |
| 269 | snd_timer_request(tid); |
| 270 | mutex_lock(®ister_mutex); |
| 271 | timer = snd_timer_find(tid); |
| 272 | } |
| 273 | #endif |
| 274 | if (!timer) { |
| 275 | mutex_unlock(®ister_mutex); |
| 276 | return -ENODEV; |
| 277 | } |
| 278 | if (!list_empty(&timer->open_list_head)) { |
| 279 | timeri = list_entry(timer->open_list_head.next, |
| 280 | struct snd_timer_instance, open_list); |
| 281 | if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { |
| 282 | mutex_unlock(®ister_mutex); |
| 283 | return -EBUSY; |
| 284 | } |
| 285 | } |
| 286 | timeri = snd_timer_instance_new(owner, timer); |
| 287 | if (!timeri) { |
| 288 | mutex_unlock(®ister_mutex); |
| 289 | return -ENOMEM; |
| 290 | } |
| 291 | timeri->slave_class = tid->dev_sclass; |
| 292 | timeri->slave_id = slave_id; |
| 293 | if (list_empty(&timer->open_list_head) && timer->hw.open) |
| 294 | timer->hw.open(timer); |
| 295 | list_add_tail(&timeri->open_list, &timer->open_list_head); |
| 296 | snd_timer_check_master(timeri); |
| 297 | mutex_unlock(®ister_mutex); |
| 298 | *ti = timeri; |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static int _snd_timer_stop(struct snd_timer_instance *timeri, |
| 303 | int keep_flag, int event); |
| 304 | |
| 305 | /* |
| 306 | * close a timer instance |
| 307 | */ |
| 308 | int snd_timer_close(struct snd_timer_instance *timeri) |
| 309 | { |
| 310 | struct snd_timer *timer = NULL; |
| 311 | struct snd_timer_instance *slave, *tmp; |
| 312 | |
| 313 | if (snd_BUG_ON(!timeri)) |
| 314 | return -ENXIO; |
| 315 | |
| 316 | /* force to stop the timer */ |
| 317 | snd_timer_stop(timeri); |
| 318 | |
| 319 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| 320 | /* wait, until the active callback is finished */ |
| 321 | spin_lock_irq(&slave_active_lock); |
| 322 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { |
| 323 | spin_unlock_irq(&slave_active_lock); |
| 324 | udelay(10); |
| 325 | spin_lock_irq(&slave_active_lock); |
| 326 | } |
| 327 | spin_unlock_irq(&slave_active_lock); |
| 328 | mutex_lock(®ister_mutex); |
| 329 | list_del(&timeri->open_list); |
| 330 | mutex_unlock(®ister_mutex); |
| 331 | } else { |
| 332 | timer = timeri->timer; |
| 333 | if (snd_BUG_ON(!timer)) |
| 334 | goto out; |
| 335 | /* wait, until the active callback is finished */ |
| 336 | spin_lock_irq(&timer->lock); |
| 337 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { |
| 338 | spin_unlock_irq(&timer->lock); |
| 339 | udelay(10); |
| 340 | spin_lock_irq(&timer->lock); |
| 341 | } |
| 342 | spin_unlock_irq(&timer->lock); |
| 343 | mutex_lock(®ister_mutex); |
| 344 | list_del(&timeri->open_list); |
| 345 | if (timer && list_empty(&timer->open_list_head) && |
| 346 | timer->hw.close) |
| 347 | timer->hw.close(timer); |
| 348 | /* remove slave links */ |
| 349 | list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, |
| 350 | open_list) { |
| 351 | spin_lock_irq(&slave_active_lock); |
| 352 | _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); |
| 353 | list_move_tail(&slave->open_list, &snd_timer_slave_list); |
| 354 | slave->master = NULL; |
| 355 | slave->timer = NULL; |
| 356 | spin_unlock_irq(&slave_active_lock); |
| 357 | } |
| 358 | mutex_unlock(®ister_mutex); |
| 359 | } |
| 360 | out: |
| 361 | if (timeri->private_free) |
| 362 | timeri->private_free(timeri); |
| 363 | kfree(timeri->owner); |
| 364 | kfree(timeri); |
| 365 | if (timer) |
| 366 | module_put(timer->module); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) |
| 371 | { |
| 372 | struct snd_timer * timer; |
| 373 | |
| 374 | if (timeri == NULL) |
| 375 | return 0; |
| 376 | if ((timer = timeri->timer) != NULL) { |
| 377 | if (timer->hw.c_resolution) |
| 378 | return timer->hw.c_resolution(timer); |
| 379 | return timer->hw.resolution; |
| 380 | } |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static void snd_timer_notify1(struct snd_timer_instance *ti, int event) |
| 385 | { |
| 386 | struct snd_timer *timer; |
| 387 | unsigned long flags; |
| 388 | unsigned long resolution = 0; |
| 389 | struct snd_timer_instance *ts; |
| 390 | struct timespec tstamp; |
| 391 | |
| 392 | if (timer_tstamp_monotonic) |
| 393 | ktime_get_ts(&tstamp); |
| 394 | else |
| 395 | getnstimeofday(&tstamp); |
| 396 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || |
| 397 | event > SNDRV_TIMER_EVENT_PAUSE)) |
| 398 | return; |
| 399 | if (event == SNDRV_TIMER_EVENT_START || |
| 400 | event == SNDRV_TIMER_EVENT_CONTINUE) |
| 401 | resolution = snd_timer_resolution(ti); |
| 402 | if (ti->ccallback) |
| 403 | ti->ccallback(ti, event, &tstamp, resolution); |
| 404 | if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) |
| 405 | return; |
| 406 | timer = ti->timer; |
| 407 | if (timer == NULL) |
| 408 | return; |
| 409 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| 410 | return; |
| 411 | spin_lock_irqsave(&timer->lock, flags); |
| 412 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
| 413 | if (ts->ccallback) |
| 414 | ts->ccallback(ti, event + 100, &tstamp, resolution); |
| 415 | spin_unlock_irqrestore(&timer->lock, flags); |
| 416 | } |
| 417 | |
| 418 | static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, |
| 419 | unsigned long sticks) |
| 420 | { |
| 421 | list_move_tail(&timeri->active_list, &timer->active_list_head); |
| 422 | if (timer->running) { |
| 423 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| 424 | goto __start_now; |
| 425 | timer->flags |= SNDRV_TIMER_FLG_RESCHED; |
| 426 | timeri->flags |= SNDRV_TIMER_IFLG_START; |
| 427 | return 1; /* delayed start */ |
| 428 | } else { |
| 429 | timer->sticks = sticks; |
| 430 | timer->hw.start(timer); |
| 431 | __start_now: |
| 432 | timer->running++; |
| 433 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| 434 | return 0; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static int snd_timer_start_slave(struct snd_timer_instance *timeri) |
| 439 | { |
| 440 | unsigned long flags; |
| 441 | |
| 442 | spin_lock_irqsave(&slave_active_lock, flags); |
| 443 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| 444 | if (timeri->master) |
| 445 | list_add_tail(&timeri->active_list, |
| 446 | &timeri->master->slave_active_head); |
| 447 | spin_unlock_irqrestore(&slave_active_lock, flags); |
| 448 | return 1; /* delayed start */ |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * start the timer instance |
| 453 | */ |
| 454 | int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) |
| 455 | { |
| 456 | struct snd_timer *timer; |
| 457 | int result = -EINVAL; |
| 458 | unsigned long flags; |
| 459 | |
| 460 | if (timeri == NULL || ticks < 1) |
| 461 | return -EINVAL; |
| 462 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| 463 | result = snd_timer_start_slave(timeri); |
| 464 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); |
| 465 | return result; |
| 466 | } |
| 467 | timer = timeri->timer; |
| 468 | if (timer == NULL) |
| 469 | return -EINVAL; |
| 470 | spin_lock_irqsave(&timer->lock, flags); |
| 471 | timeri->ticks = timeri->cticks = ticks; |
| 472 | timeri->pticks = 0; |
| 473 | result = snd_timer_start1(timer, timeri, ticks); |
| 474 | spin_unlock_irqrestore(&timer->lock, flags); |
| 475 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); |
| 476 | return result; |
| 477 | } |
| 478 | |
| 479 | static int _snd_timer_stop(struct snd_timer_instance * timeri, |
| 480 | int keep_flag, int event) |
| 481 | { |
| 482 | struct snd_timer *timer; |
| 483 | unsigned long flags; |
| 484 | |
| 485 | if (snd_BUG_ON(!timeri)) |
| 486 | return -ENXIO; |
| 487 | |
| 488 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| 489 | if (!keep_flag) { |
| 490 | spin_lock_irqsave(&slave_active_lock, flags); |
| 491 | timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| 492 | spin_unlock_irqrestore(&slave_active_lock, flags); |
| 493 | } |
| 494 | goto __end; |
| 495 | } |
| 496 | timer = timeri->timer; |
| 497 | if (!timer) |
| 498 | return -EINVAL; |
| 499 | spin_lock_irqsave(&timer->lock, flags); |
| 500 | list_del_init(&timeri->ack_list); |
| 501 | list_del_init(&timeri->active_list); |
| 502 | if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && |
| 503 | !(--timer->running)) { |
| 504 | timer->hw.stop(timer); |
| 505 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { |
| 506 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
| 507 | snd_timer_reschedule(timer, 0); |
| 508 | if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { |
| 509 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
| 510 | timer->hw.start(timer); |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | if (!keep_flag) |
| 515 | timeri->flags &= |
| 516 | ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); |
| 517 | spin_unlock_irqrestore(&timer->lock, flags); |
| 518 | __end: |
| 519 | if (event != SNDRV_TIMER_EVENT_RESOLUTION) |
| 520 | snd_timer_notify1(timeri, event); |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * stop the timer instance. |
| 526 | * |
| 527 | * do not call this from the timer callback! |
| 528 | */ |
| 529 | int snd_timer_stop(struct snd_timer_instance *timeri) |
| 530 | { |
| 531 | struct snd_timer *timer; |
| 532 | unsigned long flags; |
| 533 | int err; |
| 534 | |
| 535 | err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); |
| 536 | if (err < 0) |
| 537 | return err; |
| 538 | timer = timeri->timer; |
| 539 | if (!timer) |
| 540 | return -EINVAL; |
| 541 | spin_lock_irqsave(&timer->lock, flags); |
| 542 | timeri->cticks = timeri->ticks; |
| 543 | timeri->pticks = 0; |
| 544 | spin_unlock_irqrestore(&timer->lock, flags); |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * start again.. the tick is kept. |
| 550 | */ |
| 551 | int snd_timer_continue(struct snd_timer_instance *timeri) |
| 552 | { |
| 553 | struct snd_timer *timer; |
| 554 | int result = -EINVAL; |
| 555 | unsigned long flags; |
| 556 | |
| 557 | if (timeri == NULL) |
| 558 | return result; |
| 559 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
| 560 | return snd_timer_start_slave(timeri); |
| 561 | timer = timeri->timer; |
| 562 | if (! timer) |
| 563 | return -EINVAL; |
| 564 | spin_lock_irqsave(&timer->lock, flags); |
| 565 | if (!timeri->cticks) |
| 566 | timeri->cticks = 1; |
| 567 | timeri->pticks = 0; |
| 568 | result = snd_timer_start1(timer, timeri, timer->sticks); |
| 569 | spin_unlock_irqrestore(&timer->lock, flags); |
| 570 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); |
| 571 | return result; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * pause.. remember the ticks left |
| 576 | */ |
| 577 | int snd_timer_pause(struct snd_timer_instance * timeri) |
| 578 | { |
| 579 | return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * reschedule the timer |
| 584 | * |
| 585 | * start pending instances and check the scheduling ticks. |
| 586 | * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. |
| 587 | */ |
| 588 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) |
| 589 | { |
| 590 | struct snd_timer_instance *ti; |
| 591 | unsigned long ticks = ~0UL; |
| 592 | |
| 593 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
| 594 | if (ti->flags & SNDRV_TIMER_IFLG_START) { |
| 595 | ti->flags &= ~SNDRV_TIMER_IFLG_START; |
| 596 | ti->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| 597 | timer->running++; |
| 598 | } |
| 599 | if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| 600 | if (ticks > ti->cticks) |
| 601 | ticks = ti->cticks; |
| 602 | } |
| 603 | } |
| 604 | if (ticks == ~0UL) { |
| 605 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
| 606 | return; |
| 607 | } |
| 608 | if (ticks > timer->hw.ticks) |
| 609 | ticks = timer->hw.ticks; |
| 610 | if (ticks_left != ticks) |
| 611 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
| 612 | timer->sticks = ticks; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * timer tasklet |
| 617 | * |
| 618 | */ |
| 619 | static void snd_timer_tasklet(unsigned long arg) |
| 620 | { |
| 621 | struct snd_timer *timer = (struct snd_timer *) arg; |
| 622 | struct snd_timer_instance *ti; |
| 623 | struct list_head *p; |
| 624 | unsigned long resolution, ticks; |
| 625 | unsigned long flags; |
| 626 | |
| 627 | spin_lock_irqsave(&timer->lock, flags); |
| 628 | /* now process all callbacks */ |
| 629 | while (!list_empty(&timer->sack_list_head)) { |
| 630 | p = timer->sack_list_head.next; /* get first item */ |
| 631 | ti = list_entry(p, struct snd_timer_instance, ack_list); |
| 632 | |
| 633 | /* remove from ack_list and make empty */ |
| 634 | list_del_init(p); |
| 635 | |
| 636 | ticks = ti->pticks; |
| 637 | ti->pticks = 0; |
| 638 | resolution = ti->resolution; |
| 639 | |
| 640 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; |
| 641 | spin_unlock(&timer->lock); |
| 642 | if (ti->callback) |
| 643 | ti->callback(ti, resolution, ticks); |
| 644 | spin_lock(&timer->lock); |
| 645 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; |
| 646 | } |
| 647 | spin_unlock_irqrestore(&timer->lock, flags); |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * timer interrupt |
| 652 | * |
| 653 | * ticks_left is usually equal to timer->sticks. |
| 654 | * |
| 655 | */ |
| 656 | void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) |
| 657 | { |
| 658 | struct snd_timer_instance *ti, *ts, *tmp; |
| 659 | unsigned long resolution, ticks; |
| 660 | struct list_head *p, *ack_list_head; |
| 661 | unsigned long flags; |
| 662 | int use_tasklet = 0; |
| 663 | |
| 664 | if (timer == NULL) |
| 665 | return; |
| 666 | |
| 667 | spin_lock_irqsave(&timer->lock, flags); |
| 668 | |
| 669 | /* remember the current resolution */ |
| 670 | if (timer->hw.c_resolution) |
| 671 | resolution = timer->hw.c_resolution(timer); |
| 672 | else |
| 673 | resolution = timer->hw.resolution; |
| 674 | |
| 675 | /* loop for all active instances |
| 676 | * Here we cannot use list_for_each_entry because the active_list of a |
| 677 | * processed instance is relinked to done_list_head before the callback |
| 678 | * is called. |
| 679 | */ |
| 680 | list_for_each_entry_safe(ti, tmp, &timer->active_list_head, |
| 681 | active_list) { |
| 682 | if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) |
| 683 | continue; |
| 684 | ti->pticks += ticks_left; |
| 685 | ti->resolution = resolution; |
| 686 | if (ti->cticks < ticks_left) |
| 687 | ti->cticks = 0; |
| 688 | else |
| 689 | ti->cticks -= ticks_left; |
| 690 | if (ti->cticks) /* not expired */ |
| 691 | continue; |
| 692 | if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { |
| 693 | ti->cticks = ti->ticks; |
| 694 | } else { |
| 695 | ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| 696 | if (--timer->running) |
| 697 | list_del(&ti->active_list); |
| 698 | } |
| 699 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || |
| 700 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) |
| 701 | ack_list_head = &timer->ack_list_head; |
| 702 | else |
| 703 | ack_list_head = &timer->sack_list_head; |
| 704 | if (list_empty(&ti->ack_list)) |
| 705 | list_add_tail(&ti->ack_list, ack_list_head); |
| 706 | list_for_each_entry(ts, &ti->slave_active_head, active_list) { |
| 707 | ts->pticks = ti->pticks; |
| 708 | ts->resolution = resolution; |
| 709 | if (list_empty(&ts->ack_list)) |
| 710 | list_add_tail(&ts->ack_list, ack_list_head); |
| 711 | } |
| 712 | } |
| 713 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) |
| 714 | snd_timer_reschedule(timer, timer->sticks); |
| 715 | if (timer->running) { |
| 716 | if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { |
| 717 | timer->hw.stop(timer); |
| 718 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
| 719 | } |
| 720 | if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || |
| 721 | (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { |
| 722 | /* restart timer */ |
| 723 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
| 724 | timer->hw.start(timer); |
| 725 | } |
| 726 | } else { |
| 727 | timer->hw.stop(timer); |
| 728 | } |
| 729 | |
| 730 | /* now process all fast callbacks */ |
| 731 | while (!list_empty(&timer->ack_list_head)) { |
| 732 | p = timer->ack_list_head.next; /* get first item */ |
| 733 | ti = list_entry(p, struct snd_timer_instance, ack_list); |
| 734 | |
| 735 | /* remove from ack_list and make empty */ |
| 736 | list_del_init(p); |
| 737 | |
| 738 | ticks = ti->pticks; |
| 739 | ti->pticks = 0; |
| 740 | |
| 741 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; |
| 742 | spin_unlock(&timer->lock); |
| 743 | if (ti->callback) |
| 744 | ti->callback(ti, resolution, ticks); |
| 745 | spin_lock(&timer->lock); |
| 746 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; |
| 747 | } |
| 748 | |
| 749 | /* do we have any slow callbacks? */ |
| 750 | use_tasklet = !list_empty(&timer->sack_list_head); |
| 751 | spin_unlock_irqrestore(&timer->lock, flags); |
| 752 | |
| 753 | if (use_tasklet) |
| 754 | tasklet_schedule(&timer->task_queue); |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | |
| 759 | */ |
| 760 | |
| 761 | int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, |
| 762 | struct snd_timer **rtimer) |
| 763 | { |
| 764 | struct snd_timer *timer; |
| 765 | int err; |
| 766 | static struct snd_device_ops ops = { |
| 767 | .dev_free = snd_timer_dev_free, |
| 768 | .dev_register = snd_timer_dev_register, |
| 769 | .dev_disconnect = snd_timer_dev_disconnect, |
| 770 | }; |
| 771 | |
| 772 | if (snd_BUG_ON(!tid)) |
| 773 | return -EINVAL; |
| 774 | if (rtimer) |
| 775 | *rtimer = NULL; |
| 776 | timer = kzalloc(sizeof(*timer), GFP_KERNEL); |
| 777 | if (!timer) |
| 778 | return -ENOMEM; |
| 779 | timer->tmr_class = tid->dev_class; |
| 780 | timer->card = card; |
| 781 | timer->tmr_device = tid->device; |
| 782 | timer->tmr_subdevice = tid->subdevice; |
| 783 | if (id) |
| 784 | strlcpy(timer->id, id, sizeof(timer->id)); |
| 785 | INIT_LIST_HEAD(&timer->device_list); |
| 786 | INIT_LIST_HEAD(&timer->open_list_head); |
| 787 | INIT_LIST_HEAD(&timer->active_list_head); |
| 788 | INIT_LIST_HEAD(&timer->ack_list_head); |
| 789 | INIT_LIST_HEAD(&timer->sack_list_head); |
| 790 | spin_lock_init(&timer->lock); |
| 791 | tasklet_init(&timer->task_queue, snd_timer_tasklet, |
| 792 | (unsigned long)timer); |
| 793 | if (card != NULL) { |
| 794 | timer->module = card->module; |
| 795 | err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); |
| 796 | if (err < 0) { |
| 797 | snd_timer_free(timer); |
| 798 | return err; |
| 799 | } |
| 800 | } |
| 801 | if (rtimer) |
| 802 | *rtimer = timer; |
| 803 | return 0; |
| 804 | } |
| 805 | |
| 806 | static int snd_timer_free(struct snd_timer *timer) |
| 807 | { |
| 808 | if (!timer) |
| 809 | return 0; |
| 810 | |
| 811 | mutex_lock(®ister_mutex); |
| 812 | if (! list_empty(&timer->open_list_head)) { |
| 813 | struct list_head *p, *n; |
| 814 | struct snd_timer_instance *ti; |
| 815 | pr_warn("ALSA: timer %p is busy?\n", timer); |
| 816 | list_for_each_safe(p, n, &timer->open_list_head) { |
| 817 | list_del_init(p); |
| 818 | ti = list_entry(p, struct snd_timer_instance, open_list); |
| 819 | ti->timer = NULL; |
| 820 | } |
| 821 | } |
| 822 | list_del(&timer->device_list); |
| 823 | mutex_unlock(®ister_mutex); |
| 824 | |
| 825 | if (timer->private_free) |
| 826 | timer->private_free(timer); |
| 827 | kfree(timer); |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | static int snd_timer_dev_free(struct snd_device *device) |
| 832 | { |
| 833 | struct snd_timer *timer = device->device_data; |
| 834 | return snd_timer_free(timer); |
| 835 | } |
| 836 | |
| 837 | static int snd_timer_dev_register(struct snd_device *dev) |
| 838 | { |
| 839 | struct snd_timer *timer = dev->device_data; |
| 840 | struct snd_timer *timer1; |
| 841 | |
| 842 | if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) |
| 843 | return -ENXIO; |
| 844 | if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && |
| 845 | !timer->hw.resolution && timer->hw.c_resolution == NULL) |
| 846 | return -EINVAL; |
| 847 | |
| 848 | mutex_lock(®ister_mutex); |
| 849 | list_for_each_entry(timer1, &snd_timer_list, device_list) { |
| 850 | if (timer1->tmr_class > timer->tmr_class) |
| 851 | break; |
| 852 | if (timer1->tmr_class < timer->tmr_class) |
| 853 | continue; |
| 854 | if (timer1->card && timer->card) { |
| 855 | if (timer1->card->number > timer->card->number) |
| 856 | break; |
| 857 | if (timer1->card->number < timer->card->number) |
| 858 | continue; |
| 859 | } |
| 860 | if (timer1->tmr_device > timer->tmr_device) |
| 861 | break; |
| 862 | if (timer1->tmr_device < timer->tmr_device) |
| 863 | continue; |
| 864 | if (timer1->tmr_subdevice > timer->tmr_subdevice) |
| 865 | break; |
| 866 | if (timer1->tmr_subdevice < timer->tmr_subdevice) |
| 867 | continue; |
| 868 | /* conflicts.. */ |
| 869 | mutex_unlock(®ister_mutex); |
| 870 | return -EBUSY; |
| 871 | } |
| 872 | list_add_tail(&timer->device_list, &timer1->device_list); |
| 873 | mutex_unlock(®ister_mutex); |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | static int snd_timer_dev_disconnect(struct snd_device *device) |
| 878 | { |
| 879 | struct snd_timer *timer = device->device_data; |
| 880 | mutex_lock(®ister_mutex); |
| 881 | list_del_init(&timer->device_list); |
| 882 | mutex_unlock(®ister_mutex); |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) |
| 887 | { |
| 888 | unsigned long flags; |
| 889 | unsigned long resolution = 0; |
| 890 | struct snd_timer_instance *ti, *ts; |
| 891 | |
| 892 | if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) |
| 893 | return; |
| 894 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || |
| 895 | event > SNDRV_TIMER_EVENT_MRESUME)) |
| 896 | return; |
| 897 | spin_lock_irqsave(&timer->lock, flags); |
| 898 | if (event == SNDRV_TIMER_EVENT_MSTART || |
| 899 | event == SNDRV_TIMER_EVENT_MCONTINUE || |
| 900 | event == SNDRV_TIMER_EVENT_MRESUME) { |
| 901 | if (timer->hw.c_resolution) |
| 902 | resolution = timer->hw.c_resolution(timer); |
| 903 | else |
| 904 | resolution = timer->hw.resolution; |
| 905 | } |
| 906 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
| 907 | if (ti->ccallback) |
| 908 | ti->ccallback(ti, event, tstamp, resolution); |
| 909 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
| 910 | if (ts->ccallback) |
| 911 | ts->ccallback(ts, event, tstamp, resolution); |
| 912 | } |
| 913 | spin_unlock_irqrestore(&timer->lock, flags); |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * exported functions for global timers |
| 918 | */ |
| 919 | int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) |
| 920 | { |
| 921 | struct snd_timer_id tid; |
| 922 | |
| 923 | tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; |
| 924 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| 925 | tid.card = -1; |
| 926 | tid.device = device; |
| 927 | tid.subdevice = 0; |
| 928 | return snd_timer_new(NULL, id, &tid, rtimer); |
| 929 | } |
| 930 | |
| 931 | int snd_timer_global_free(struct snd_timer *timer) |
| 932 | { |
| 933 | return snd_timer_free(timer); |
| 934 | } |
| 935 | |
| 936 | int snd_timer_global_register(struct snd_timer *timer) |
| 937 | { |
| 938 | struct snd_device dev; |
| 939 | |
| 940 | memset(&dev, 0, sizeof(dev)); |
| 941 | dev.device_data = timer; |
| 942 | return snd_timer_dev_register(&dev); |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | * System timer |
| 947 | */ |
| 948 | |
| 949 | struct snd_timer_system_private { |
| 950 | struct timer_list tlist; |
| 951 | unsigned long last_expires; |
| 952 | unsigned long last_jiffies; |
| 953 | unsigned long correction; |
| 954 | }; |
| 955 | |
| 956 | static void snd_timer_s_function(unsigned long data) |
| 957 | { |
| 958 | struct snd_timer *timer = (struct snd_timer *)data; |
| 959 | struct snd_timer_system_private *priv = timer->private_data; |
| 960 | unsigned long jiff = jiffies; |
| 961 | if (time_after(jiff, priv->last_expires)) |
| 962 | priv->correction += (long)jiff - (long)priv->last_expires; |
| 963 | snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); |
| 964 | } |
| 965 | |
| 966 | static int snd_timer_s_start(struct snd_timer * timer) |
| 967 | { |
| 968 | struct snd_timer_system_private *priv; |
| 969 | unsigned long njiff; |
| 970 | |
| 971 | priv = (struct snd_timer_system_private *) timer->private_data; |
| 972 | njiff = (priv->last_jiffies = jiffies); |
| 973 | if (priv->correction > timer->sticks - 1) { |
| 974 | priv->correction -= timer->sticks - 1; |
| 975 | njiff++; |
| 976 | } else { |
| 977 | njiff += timer->sticks - priv->correction; |
| 978 | priv->correction = 0; |
| 979 | } |
| 980 | priv->last_expires = priv->tlist.expires = njiff; |
| 981 | add_timer(&priv->tlist); |
| 982 | return 0; |
| 983 | } |
| 984 | |
| 985 | static int snd_timer_s_stop(struct snd_timer * timer) |
| 986 | { |
| 987 | struct snd_timer_system_private *priv; |
| 988 | unsigned long jiff; |
| 989 | |
| 990 | priv = (struct snd_timer_system_private *) timer->private_data; |
| 991 | del_timer(&priv->tlist); |
| 992 | jiff = jiffies; |
| 993 | if (time_before(jiff, priv->last_expires)) |
| 994 | timer->sticks = priv->last_expires - jiff; |
| 995 | else |
| 996 | timer->sticks = 1; |
| 997 | priv->correction = 0; |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | static struct snd_timer_hardware snd_timer_system = |
| 1002 | { |
| 1003 | .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, |
| 1004 | .resolution = 1000000000L / HZ, |
| 1005 | .ticks = 10000000L, |
| 1006 | .start = snd_timer_s_start, |
| 1007 | .stop = snd_timer_s_stop |
| 1008 | }; |
| 1009 | |
| 1010 | static void snd_timer_free_system(struct snd_timer *timer) |
| 1011 | { |
| 1012 | kfree(timer->private_data); |
| 1013 | } |
| 1014 | |
| 1015 | static int snd_timer_register_system(void) |
| 1016 | { |
| 1017 | struct snd_timer *timer; |
| 1018 | struct snd_timer_system_private *priv; |
| 1019 | int err; |
| 1020 | |
| 1021 | err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); |
| 1022 | if (err < 0) |
| 1023 | return err; |
| 1024 | strcpy(timer->name, "system timer"); |
| 1025 | timer->hw = snd_timer_system; |
| 1026 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 1027 | if (priv == NULL) { |
| 1028 | snd_timer_free(timer); |
| 1029 | return -ENOMEM; |
| 1030 | } |
| 1031 | setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); |
| 1032 | timer->private_data = priv; |
| 1033 | timer->private_free = snd_timer_free_system; |
| 1034 | return snd_timer_global_register(timer); |
| 1035 | } |
| 1036 | |
| 1037 | #ifdef CONFIG_SND_PROC_FS |
| 1038 | /* |
| 1039 | * Info interface |
| 1040 | */ |
| 1041 | |
| 1042 | static void snd_timer_proc_read(struct snd_info_entry *entry, |
| 1043 | struct snd_info_buffer *buffer) |
| 1044 | { |
| 1045 | struct snd_timer *timer; |
| 1046 | struct snd_timer_instance *ti; |
| 1047 | |
| 1048 | mutex_lock(®ister_mutex); |
| 1049 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
| 1050 | switch (timer->tmr_class) { |
| 1051 | case SNDRV_TIMER_CLASS_GLOBAL: |
| 1052 | snd_iprintf(buffer, "G%i: ", timer->tmr_device); |
| 1053 | break; |
| 1054 | case SNDRV_TIMER_CLASS_CARD: |
| 1055 | snd_iprintf(buffer, "C%i-%i: ", |
| 1056 | timer->card->number, timer->tmr_device); |
| 1057 | break; |
| 1058 | case SNDRV_TIMER_CLASS_PCM: |
| 1059 | snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, |
| 1060 | timer->tmr_device, timer->tmr_subdevice); |
| 1061 | break; |
| 1062 | default: |
| 1063 | snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, |
| 1064 | timer->card ? timer->card->number : -1, |
| 1065 | timer->tmr_device, timer->tmr_subdevice); |
| 1066 | } |
| 1067 | snd_iprintf(buffer, "%s :", timer->name); |
| 1068 | if (timer->hw.resolution) |
| 1069 | snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", |
| 1070 | timer->hw.resolution / 1000, |
| 1071 | timer->hw.resolution % 1000, |
| 1072 | timer->hw.ticks); |
| 1073 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| 1074 | snd_iprintf(buffer, " SLAVE"); |
| 1075 | snd_iprintf(buffer, "\n"); |
| 1076 | list_for_each_entry(ti, &timer->open_list_head, open_list) |
| 1077 | snd_iprintf(buffer, " Client %s : %s\n", |
| 1078 | ti->owner ? ti->owner : "unknown", |
| 1079 | ti->flags & (SNDRV_TIMER_IFLG_START | |
| 1080 | SNDRV_TIMER_IFLG_RUNNING) |
| 1081 | ? "running" : "stopped"); |
| 1082 | } |
| 1083 | mutex_unlock(®ister_mutex); |
| 1084 | } |
| 1085 | |
| 1086 | static struct snd_info_entry *snd_timer_proc_entry; |
| 1087 | |
| 1088 | static void __init snd_timer_proc_init(void) |
| 1089 | { |
| 1090 | struct snd_info_entry *entry; |
| 1091 | |
| 1092 | entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); |
| 1093 | if (entry != NULL) { |
| 1094 | entry->c.text.read = snd_timer_proc_read; |
| 1095 | if (snd_info_register(entry) < 0) { |
| 1096 | snd_info_free_entry(entry); |
| 1097 | entry = NULL; |
| 1098 | } |
| 1099 | } |
| 1100 | snd_timer_proc_entry = entry; |
| 1101 | } |
| 1102 | |
| 1103 | static void __exit snd_timer_proc_done(void) |
| 1104 | { |
| 1105 | snd_info_free_entry(snd_timer_proc_entry); |
| 1106 | } |
| 1107 | #else /* !CONFIG_SND_PROC_FS */ |
| 1108 | #define snd_timer_proc_init() |
| 1109 | #define snd_timer_proc_done() |
| 1110 | #endif |
| 1111 | |
| 1112 | /* |
| 1113 | * USER SPACE interface |
| 1114 | */ |
| 1115 | |
| 1116 | static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, |
| 1117 | unsigned long resolution, |
| 1118 | unsigned long ticks) |
| 1119 | { |
| 1120 | struct snd_timer_user *tu = timeri->callback_data; |
| 1121 | struct snd_timer_read *r; |
| 1122 | int prev; |
| 1123 | |
| 1124 | spin_lock(&tu->qlock); |
| 1125 | if (tu->qused > 0) { |
| 1126 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; |
| 1127 | r = &tu->queue[prev]; |
| 1128 | if (r->resolution == resolution) { |
| 1129 | r->ticks += ticks; |
| 1130 | goto __wake; |
| 1131 | } |
| 1132 | } |
| 1133 | if (tu->qused >= tu->queue_size) { |
| 1134 | tu->overrun++; |
| 1135 | } else { |
| 1136 | r = &tu->queue[tu->qtail++]; |
| 1137 | tu->qtail %= tu->queue_size; |
| 1138 | r->resolution = resolution; |
| 1139 | r->ticks = ticks; |
| 1140 | tu->qused++; |
| 1141 | } |
| 1142 | __wake: |
| 1143 | spin_unlock(&tu->qlock); |
| 1144 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
| 1145 | wake_up(&tu->qchange_sleep); |
| 1146 | } |
| 1147 | |
| 1148 | static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, |
| 1149 | struct snd_timer_tread *tread) |
| 1150 | { |
| 1151 | if (tu->qused >= tu->queue_size) { |
| 1152 | tu->overrun++; |
| 1153 | } else { |
| 1154 | memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); |
| 1155 | tu->qtail %= tu->queue_size; |
| 1156 | tu->qused++; |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, |
| 1161 | int event, |
| 1162 | struct timespec *tstamp, |
| 1163 | unsigned long resolution) |
| 1164 | { |
| 1165 | struct snd_timer_user *tu = timeri->callback_data; |
| 1166 | struct snd_timer_tread r1; |
| 1167 | unsigned long flags; |
| 1168 | |
| 1169 | if (event >= SNDRV_TIMER_EVENT_START && |
| 1170 | event <= SNDRV_TIMER_EVENT_PAUSE) |
| 1171 | tu->tstamp = *tstamp; |
| 1172 | if ((tu->filter & (1 << event)) == 0 || !tu->tread) |
| 1173 | return; |
| 1174 | r1.event = event; |
| 1175 | r1.tstamp = *tstamp; |
| 1176 | r1.val = resolution; |
| 1177 | spin_lock_irqsave(&tu->qlock, flags); |
| 1178 | snd_timer_user_append_to_tqueue(tu, &r1); |
| 1179 | spin_unlock_irqrestore(&tu->qlock, flags); |
| 1180 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
| 1181 | wake_up(&tu->qchange_sleep); |
| 1182 | } |
| 1183 | |
| 1184 | static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, |
| 1185 | unsigned long resolution, |
| 1186 | unsigned long ticks) |
| 1187 | { |
| 1188 | struct snd_timer_user *tu = timeri->callback_data; |
| 1189 | struct snd_timer_tread *r, r1; |
| 1190 | struct timespec tstamp; |
| 1191 | int prev, append = 0; |
| 1192 | |
| 1193 | memset(&tstamp, 0, sizeof(tstamp)); |
| 1194 | spin_lock(&tu->qlock); |
| 1195 | if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | |
| 1196 | (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { |
| 1197 | spin_unlock(&tu->qlock); |
| 1198 | return; |
| 1199 | } |
| 1200 | if (tu->last_resolution != resolution || ticks > 0) { |
| 1201 | if (timer_tstamp_monotonic) |
| 1202 | ktime_get_ts(&tstamp); |
| 1203 | else |
| 1204 | getnstimeofday(&tstamp); |
| 1205 | } |
| 1206 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && |
| 1207 | tu->last_resolution != resolution) { |
| 1208 | r1.event = SNDRV_TIMER_EVENT_RESOLUTION; |
| 1209 | r1.tstamp = tstamp; |
| 1210 | r1.val = resolution; |
| 1211 | snd_timer_user_append_to_tqueue(tu, &r1); |
| 1212 | tu->last_resolution = resolution; |
| 1213 | append++; |
| 1214 | } |
| 1215 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) |
| 1216 | goto __wake; |
| 1217 | if (ticks == 0) |
| 1218 | goto __wake; |
| 1219 | if (tu->qused > 0) { |
| 1220 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; |
| 1221 | r = &tu->tqueue[prev]; |
| 1222 | if (r->event == SNDRV_TIMER_EVENT_TICK) { |
| 1223 | r->tstamp = tstamp; |
| 1224 | r->val += ticks; |
| 1225 | append++; |
| 1226 | goto __wake; |
| 1227 | } |
| 1228 | } |
| 1229 | r1.event = SNDRV_TIMER_EVENT_TICK; |
| 1230 | r1.tstamp = tstamp; |
| 1231 | r1.val = ticks; |
| 1232 | snd_timer_user_append_to_tqueue(tu, &r1); |
| 1233 | append++; |
| 1234 | __wake: |
| 1235 | spin_unlock(&tu->qlock); |
| 1236 | if (append == 0) |
| 1237 | return; |
| 1238 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
| 1239 | wake_up(&tu->qchange_sleep); |
| 1240 | } |
| 1241 | |
| 1242 | static int snd_timer_user_open(struct inode *inode, struct file *file) |
| 1243 | { |
| 1244 | struct snd_timer_user *tu; |
| 1245 | int err; |
| 1246 | |
| 1247 | err = nonseekable_open(inode, file); |
| 1248 | if (err < 0) |
| 1249 | return err; |
| 1250 | |
| 1251 | tu = kzalloc(sizeof(*tu), GFP_KERNEL); |
| 1252 | if (tu == NULL) |
| 1253 | return -ENOMEM; |
| 1254 | spin_lock_init(&tu->qlock); |
| 1255 | init_waitqueue_head(&tu->qchange_sleep); |
| 1256 | mutex_init(&tu->tread_sem); |
| 1257 | tu->ticks = 1; |
| 1258 | tu->queue_size = 128; |
| 1259 | tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), |
| 1260 | GFP_KERNEL); |
| 1261 | if (tu->queue == NULL) { |
| 1262 | kfree(tu); |
| 1263 | return -ENOMEM; |
| 1264 | } |
| 1265 | file->private_data = tu; |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | static int snd_timer_user_release(struct inode *inode, struct file *file) |
| 1270 | { |
| 1271 | struct snd_timer_user *tu; |
| 1272 | |
| 1273 | if (file->private_data) { |
| 1274 | tu = file->private_data; |
| 1275 | file->private_data = NULL; |
| 1276 | if (tu->timeri) |
| 1277 | snd_timer_close(tu->timeri); |
| 1278 | kfree(tu->queue); |
| 1279 | kfree(tu->tqueue); |
| 1280 | kfree(tu); |
| 1281 | } |
| 1282 | return 0; |
| 1283 | } |
| 1284 | |
| 1285 | static void snd_timer_user_zero_id(struct snd_timer_id *id) |
| 1286 | { |
| 1287 | id->dev_class = SNDRV_TIMER_CLASS_NONE; |
| 1288 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| 1289 | id->card = -1; |
| 1290 | id->device = -1; |
| 1291 | id->subdevice = -1; |
| 1292 | } |
| 1293 | |
| 1294 | static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) |
| 1295 | { |
| 1296 | id->dev_class = timer->tmr_class; |
| 1297 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| 1298 | id->card = timer->card ? timer->card->number : -1; |
| 1299 | id->device = timer->tmr_device; |
| 1300 | id->subdevice = timer->tmr_subdevice; |
| 1301 | } |
| 1302 | |
| 1303 | static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) |
| 1304 | { |
| 1305 | struct snd_timer_id id; |
| 1306 | struct snd_timer *timer; |
| 1307 | struct list_head *p; |
| 1308 | |
| 1309 | if (copy_from_user(&id, _tid, sizeof(id))) |
| 1310 | return -EFAULT; |
| 1311 | mutex_lock(®ister_mutex); |
| 1312 | if (id.dev_class < 0) { /* first item */ |
| 1313 | if (list_empty(&snd_timer_list)) |
| 1314 | snd_timer_user_zero_id(&id); |
| 1315 | else { |
| 1316 | timer = list_entry(snd_timer_list.next, |
| 1317 | struct snd_timer, device_list); |
| 1318 | snd_timer_user_copy_id(&id, timer); |
| 1319 | } |
| 1320 | } else { |
| 1321 | switch (id.dev_class) { |
| 1322 | case SNDRV_TIMER_CLASS_GLOBAL: |
| 1323 | id.device = id.device < 0 ? 0 : id.device + 1; |
| 1324 | list_for_each(p, &snd_timer_list) { |
| 1325 | timer = list_entry(p, struct snd_timer, device_list); |
| 1326 | if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { |
| 1327 | snd_timer_user_copy_id(&id, timer); |
| 1328 | break; |
| 1329 | } |
| 1330 | if (timer->tmr_device >= id.device) { |
| 1331 | snd_timer_user_copy_id(&id, timer); |
| 1332 | break; |
| 1333 | } |
| 1334 | } |
| 1335 | if (p == &snd_timer_list) |
| 1336 | snd_timer_user_zero_id(&id); |
| 1337 | break; |
| 1338 | case SNDRV_TIMER_CLASS_CARD: |
| 1339 | case SNDRV_TIMER_CLASS_PCM: |
| 1340 | if (id.card < 0) { |
| 1341 | id.card = 0; |
| 1342 | } else { |
| 1343 | if (id.card < 0) { |
| 1344 | id.card = 0; |
| 1345 | } else { |
| 1346 | if (id.device < 0) { |
| 1347 | id.device = 0; |
| 1348 | } else { |
| 1349 | if (id.subdevice < 0) { |
| 1350 | id.subdevice = 0; |
| 1351 | } else { |
| 1352 | id.subdevice++; |
| 1353 | } |
| 1354 | } |
| 1355 | } |
| 1356 | } |
| 1357 | list_for_each(p, &snd_timer_list) { |
| 1358 | timer = list_entry(p, struct snd_timer, device_list); |
| 1359 | if (timer->tmr_class > id.dev_class) { |
| 1360 | snd_timer_user_copy_id(&id, timer); |
| 1361 | break; |
| 1362 | } |
| 1363 | if (timer->tmr_class < id.dev_class) |
| 1364 | continue; |
| 1365 | if (timer->card->number > id.card) { |
| 1366 | snd_timer_user_copy_id(&id, timer); |
| 1367 | break; |
| 1368 | } |
| 1369 | if (timer->card->number < id.card) |
| 1370 | continue; |
| 1371 | if (timer->tmr_device > id.device) { |
| 1372 | snd_timer_user_copy_id(&id, timer); |
| 1373 | break; |
| 1374 | } |
| 1375 | if (timer->tmr_device < id.device) |
| 1376 | continue; |
| 1377 | if (timer->tmr_subdevice > id.subdevice) { |
| 1378 | snd_timer_user_copy_id(&id, timer); |
| 1379 | break; |
| 1380 | } |
| 1381 | if (timer->tmr_subdevice < id.subdevice) |
| 1382 | continue; |
| 1383 | snd_timer_user_copy_id(&id, timer); |
| 1384 | break; |
| 1385 | } |
| 1386 | if (p == &snd_timer_list) |
| 1387 | snd_timer_user_zero_id(&id); |
| 1388 | break; |
| 1389 | default: |
| 1390 | snd_timer_user_zero_id(&id); |
| 1391 | } |
| 1392 | } |
| 1393 | mutex_unlock(®ister_mutex); |
| 1394 | if (copy_to_user(_tid, &id, sizeof(*_tid))) |
| 1395 | return -EFAULT; |
| 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | static int snd_timer_user_ginfo(struct file *file, |
| 1400 | struct snd_timer_ginfo __user *_ginfo) |
| 1401 | { |
| 1402 | struct snd_timer_ginfo *ginfo; |
| 1403 | struct snd_timer_id tid; |
| 1404 | struct snd_timer *t; |
| 1405 | struct list_head *p; |
| 1406 | int err = 0; |
| 1407 | |
| 1408 | ginfo = memdup_user(_ginfo, sizeof(*ginfo)); |
| 1409 | if (IS_ERR(ginfo)) |
| 1410 | return PTR_ERR(ginfo); |
| 1411 | |
| 1412 | tid = ginfo->tid; |
| 1413 | memset(ginfo, 0, sizeof(*ginfo)); |
| 1414 | ginfo->tid = tid; |
| 1415 | mutex_lock(®ister_mutex); |
| 1416 | t = snd_timer_find(&tid); |
| 1417 | if (t != NULL) { |
| 1418 | ginfo->card = t->card ? t->card->number : -1; |
| 1419 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| 1420 | ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; |
| 1421 | strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); |
| 1422 | strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); |
| 1423 | ginfo->resolution = t->hw.resolution; |
| 1424 | if (t->hw.resolution_min > 0) { |
| 1425 | ginfo->resolution_min = t->hw.resolution_min; |
| 1426 | ginfo->resolution_max = t->hw.resolution_max; |
| 1427 | } |
| 1428 | list_for_each(p, &t->open_list_head) { |
| 1429 | ginfo->clients++; |
| 1430 | } |
| 1431 | } else { |
| 1432 | err = -ENODEV; |
| 1433 | } |
| 1434 | mutex_unlock(®ister_mutex); |
| 1435 | if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) |
| 1436 | err = -EFAULT; |
| 1437 | kfree(ginfo); |
| 1438 | return err; |
| 1439 | } |
| 1440 | |
| 1441 | static int snd_timer_user_gparams(struct file *file, |
| 1442 | struct snd_timer_gparams __user *_gparams) |
| 1443 | { |
| 1444 | struct snd_timer_gparams gparams; |
| 1445 | struct snd_timer *t; |
| 1446 | int err; |
| 1447 | |
| 1448 | if (copy_from_user(&gparams, _gparams, sizeof(gparams))) |
| 1449 | return -EFAULT; |
| 1450 | mutex_lock(®ister_mutex); |
| 1451 | t = snd_timer_find(&gparams.tid); |
| 1452 | if (!t) { |
| 1453 | err = -ENODEV; |
| 1454 | goto _error; |
| 1455 | } |
| 1456 | if (!list_empty(&t->open_list_head)) { |
| 1457 | err = -EBUSY; |
| 1458 | goto _error; |
| 1459 | } |
| 1460 | if (!t->hw.set_period) { |
| 1461 | err = -ENOSYS; |
| 1462 | goto _error; |
| 1463 | } |
| 1464 | err = t->hw.set_period(t, gparams.period_num, gparams.period_den); |
| 1465 | _error: |
| 1466 | mutex_unlock(®ister_mutex); |
| 1467 | return err; |
| 1468 | } |
| 1469 | |
| 1470 | static int snd_timer_user_gstatus(struct file *file, |
| 1471 | struct snd_timer_gstatus __user *_gstatus) |
| 1472 | { |
| 1473 | struct snd_timer_gstatus gstatus; |
| 1474 | struct snd_timer_id tid; |
| 1475 | struct snd_timer *t; |
| 1476 | int err = 0; |
| 1477 | |
| 1478 | if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) |
| 1479 | return -EFAULT; |
| 1480 | tid = gstatus.tid; |
| 1481 | memset(&gstatus, 0, sizeof(gstatus)); |
| 1482 | gstatus.tid = tid; |
| 1483 | mutex_lock(®ister_mutex); |
| 1484 | t = snd_timer_find(&tid); |
| 1485 | if (t != NULL) { |
| 1486 | if (t->hw.c_resolution) |
| 1487 | gstatus.resolution = t->hw.c_resolution(t); |
| 1488 | else |
| 1489 | gstatus.resolution = t->hw.resolution; |
| 1490 | if (t->hw.precise_resolution) { |
| 1491 | t->hw.precise_resolution(t, &gstatus.resolution_num, |
| 1492 | &gstatus.resolution_den); |
| 1493 | } else { |
| 1494 | gstatus.resolution_num = gstatus.resolution; |
| 1495 | gstatus.resolution_den = 1000000000uL; |
| 1496 | } |
| 1497 | } else { |
| 1498 | err = -ENODEV; |
| 1499 | } |
| 1500 | mutex_unlock(®ister_mutex); |
| 1501 | if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) |
| 1502 | err = -EFAULT; |
| 1503 | return err; |
| 1504 | } |
| 1505 | |
| 1506 | static int snd_timer_user_tselect(struct file *file, |
| 1507 | struct snd_timer_select __user *_tselect) |
| 1508 | { |
| 1509 | struct snd_timer_user *tu; |
| 1510 | struct snd_timer_select tselect; |
| 1511 | char str[32]; |
| 1512 | int err = 0; |
| 1513 | |
| 1514 | tu = file->private_data; |
| 1515 | mutex_lock(&tu->tread_sem); |
| 1516 | if (tu->timeri) { |
| 1517 | snd_timer_close(tu->timeri); |
| 1518 | tu->timeri = NULL; |
| 1519 | } |
| 1520 | if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { |
| 1521 | err = -EFAULT; |
| 1522 | goto __err; |
| 1523 | } |
| 1524 | sprintf(str, "application %i", current->pid); |
| 1525 | if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) |
| 1526 | tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; |
| 1527 | err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); |
| 1528 | if (err < 0) |
| 1529 | goto __err; |
| 1530 | |
| 1531 | kfree(tu->queue); |
| 1532 | tu->queue = NULL; |
| 1533 | kfree(tu->tqueue); |
| 1534 | tu->tqueue = NULL; |
| 1535 | if (tu->tread) { |
| 1536 | tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), |
| 1537 | GFP_KERNEL); |
| 1538 | if (tu->tqueue == NULL) |
| 1539 | err = -ENOMEM; |
| 1540 | } else { |
| 1541 | tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), |
| 1542 | GFP_KERNEL); |
| 1543 | if (tu->queue == NULL) |
| 1544 | err = -ENOMEM; |
| 1545 | } |
| 1546 | |
| 1547 | if (err < 0) { |
| 1548 | snd_timer_close(tu->timeri); |
| 1549 | tu->timeri = NULL; |
| 1550 | } else { |
| 1551 | tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; |
| 1552 | tu->timeri->callback = tu->tread |
| 1553 | ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; |
| 1554 | tu->timeri->ccallback = snd_timer_user_ccallback; |
| 1555 | tu->timeri->callback_data = (void *)tu; |
| 1556 | } |
| 1557 | |
| 1558 | __err: |
| 1559 | mutex_unlock(&tu->tread_sem); |
| 1560 | return err; |
| 1561 | } |
| 1562 | |
| 1563 | static int snd_timer_user_info(struct file *file, |
| 1564 | struct snd_timer_info __user *_info) |
| 1565 | { |
| 1566 | struct snd_timer_user *tu; |
| 1567 | struct snd_timer_info *info; |
| 1568 | struct snd_timer *t; |
| 1569 | int err = 0; |
| 1570 | |
| 1571 | tu = file->private_data; |
| 1572 | if (!tu->timeri) |
| 1573 | return -EBADFD; |
| 1574 | t = tu->timeri->timer; |
| 1575 | if (!t) |
| 1576 | return -EBADFD; |
| 1577 | |
| 1578 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 1579 | if (! info) |
| 1580 | return -ENOMEM; |
| 1581 | info->card = t->card ? t->card->number : -1; |
| 1582 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| 1583 | info->flags |= SNDRV_TIMER_FLG_SLAVE; |
| 1584 | strlcpy(info->id, t->id, sizeof(info->id)); |
| 1585 | strlcpy(info->name, t->name, sizeof(info->name)); |
| 1586 | info->resolution = t->hw.resolution; |
| 1587 | if (copy_to_user(_info, info, sizeof(*_info))) |
| 1588 | err = -EFAULT; |
| 1589 | kfree(info); |
| 1590 | return err; |
| 1591 | } |
| 1592 | |
| 1593 | static int snd_timer_user_params(struct file *file, |
| 1594 | struct snd_timer_params __user *_params) |
| 1595 | { |
| 1596 | struct snd_timer_user *tu; |
| 1597 | struct snd_timer_params params; |
| 1598 | struct snd_timer *t; |
| 1599 | struct snd_timer_read *tr; |
| 1600 | struct snd_timer_tread *ttr; |
| 1601 | int err; |
| 1602 | |
| 1603 | tu = file->private_data; |
| 1604 | if (!tu->timeri) |
| 1605 | return -EBADFD; |
| 1606 | t = tu->timeri->timer; |
| 1607 | if (!t) |
| 1608 | return -EBADFD; |
| 1609 | if (copy_from_user(¶ms, _params, sizeof(params))) |
| 1610 | return -EFAULT; |
| 1611 | if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { |
| 1612 | err = -EINVAL; |
| 1613 | goto _end; |
| 1614 | } |
| 1615 | if (params.queue_size > 0 && |
| 1616 | (params.queue_size < 32 || params.queue_size > 1024)) { |
| 1617 | err = -EINVAL; |
| 1618 | goto _end; |
| 1619 | } |
| 1620 | if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| |
| 1621 | (1<<SNDRV_TIMER_EVENT_TICK)| |
| 1622 | (1<<SNDRV_TIMER_EVENT_START)| |
| 1623 | (1<<SNDRV_TIMER_EVENT_STOP)| |
| 1624 | (1<<SNDRV_TIMER_EVENT_CONTINUE)| |
| 1625 | (1<<SNDRV_TIMER_EVENT_PAUSE)| |
| 1626 | (1<<SNDRV_TIMER_EVENT_SUSPEND)| |
| 1627 | (1<<SNDRV_TIMER_EVENT_RESUME)| |
| 1628 | (1<<SNDRV_TIMER_EVENT_MSTART)| |
| 1629 | (1<<SNDRV_TIMER_EVENT_MSTOP)| |
| 1630 | (1<<SNDRV_TIMER_EVENT_MCONTINUE)| |
| 1631 | (1<<SNDRV_TIMER_EVENT_MPAUSE)| |
| 1632 | (1<<SNDRV_TIMER_EVENT_MSUSPEND)| |
| 1633 | (1<<SNDRV_TIMER_EVENT_MRESUME))) { |
| 1634 | err = -EINVAL; |
| 1635 | goto _end; |
| 1636 | } |
| 1637 | snd_timer_stop(tu->timeri); |
| 1638 | spin_lock_irq(&t->lock); |
| 1639 | tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| |
| 1640 | SNDRV_TIMER_IFLG_EXCLUSIVE| |
| 1641 | SNDRV_TIMER_IFLG_EARLY_EVENT); |
| 1642 | if (params.flags & SNDRV_TIMER_PSFLG_AUTO) |
| 1643 | tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; |
| 1644 | if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) |
| 1645 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; |
| 1646 | if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) |
| 1647 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; |
| 1648 | spin_unlock_irq(&t->lock); |
| 1649 | if (params.queue_size > 0 && |
| 1650 | (unsigned int)tu->queue_size != params.queue_size) { |
| 1651 | if (tu->tread) { |
| 1652 | ttr = kmalloc(params.queue_size * sizeof(*ttr), |
| 1653 | GFP_KERNEL); |
| 1654 | if (ttr) { |
| 1655 | kfree(tu->tqueue); |
| 1656 | tu->queue_size = params.queue_size; |
| 1657 | tu->tqueue = ttr; |
| 1658 | } |
| 1659 | } else { |
| 1660 | tr = kmalloc(params.queue_size * sizeof(*tr), |
| 1661 | GFP_KERNEL); |
| 1662 | if (tr) { |
| 1663 | kfree(tu->queue); |
| 1664 | tu->queue_size = params.queue_size; |
| 1665 | tu->queue = tr; |
| 1666 | } |
| 1667 | } |
| 1668 | } |
| 1669 | tu->qhead = tu->qtail = tu->qused = 0; |
| 1670 | if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { |
| 1671 | if (tu->tread) { |
| 1672 | struct snd_timer_tread tread; |
| 1673 | tread.event = SNDRV_TIMER_EVENT_EARLY; |
| 1674 | tread.tstamp.tv_sec = 0; |
| 1675 | tread.tstamp.tv_nsec = 0; |
| 1676 | tread.val = 0; |
| 1677 | snd_timer_user_append_to_tqueue(tu, &tread); |
| 1678 | } else { |
| 1679 | struct snd_timer_read *r = &tu->queue[0]; |
| 1680 | r->resolution = 0; |
| 1681 | r->ticks = 0; |
| 1682 | tu->qused++; |
| 1683 | tu->qtail++; |
| 1684 | } |
| 1685 | } |
| 1686 | tu->filter = params.filter; |
| 1687 | tu->ticks = params.ticks; |
| 1688 | err = 0; |
| 1689 | _end: |
| 1690 | if (copy_to_user(_params, ¶ms, sizeof(params))) |
| 1691 | return -EFAULT; |
| 1692 | return err; |
| 1693 | } |
| 1694 | |
| 1695 | static int snd_timer_user_status(struct file *file, |
| 1696 | struct snd_timer_status __user *_status) |
| 1697 | { |
| 1698 | struct snd_timer_user *tu; |
| 1699 | struct snd_timer_status status; |
| 1700 | |
| 1701 | tu = file->private_data; |
| 1702 | if (!tu->timeri) |
| 1703 | return -EBADFD; |
| 1704 | memset(&status, 0, sizeof(status)); |
| 1705 | status.tstamp = tu->tstamp; |
| 1706 | status.resolution = snd_timer_resolution(tu->timeri); |
| 1707 | status.lost = tu->timeri->lost; |
| 1708 | status.overrun = tu->overrun; |
| 1709 | spin_lock_irq(&tu->qlock); |
| 1710 | status.queue = tu->qused; |
| 1711 | spin_unlock_irq(&tu->qlock); |
| 1712 | if (copy_to_user(_status, &status, sizeof(status))) |
| 1713 | return -EFAULT; |
| 1714 | return 0; |
| 1715 | } |
| 1716 | |
| 1717 | static int snd_timer_user_start(struct file *file) |
| 1718 | { |
| 1719 | int err; |
| 1720 | struct snd_timer_user *tu; |
| 1721 | |
| 1722 | tu = file->private_data; |
| 1723 | if (!tu->timeri) |
| 1724 | return -EBADFD; |
| 1725 | snd_timer_stop(tu->timeri); |
| 1726 | tu->timeri->lost = 0; |
| 1727 | tu->last_resolution = 0; |
| 1728 | return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; |
| 1729 | } |
| 1730 | |
| 1731 | static int snd_timer_user_stop(struct file *file) |
| 1732 | { |
| 1733 | int err; |
| 1734 | struct snd_timer_user *tu; |
| 1735 | |
| 1736 | tu = file->private_data; |
| 1737 | if (!tu->timeri) |
| 1738 | return -EBADFD; |
| 1739 | return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; |
| 1740 | } |
| 1741 | |
| 1742 | static int snd_timer_user_continue(struct file *file) |
| 1743 | { |
| 1744 | int err; |
| 1745 | struct snd_timer_user *tu; |
| 1746 | |
| 1747 | tu = file->private_data; |
| 1748 | if (!tu->timeri) |
| 1749 | return -EBADFD; |
| 1750 | tu->timeri->lost = 0; |
| 1751 | return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; |
| 1752 | } |
| 1753 | |
| 1754 | static int snd_timer_user_pause(struct file *file) |
| 1755 | { |
| 1756 | int err; |
| 1757 | struct snd_timer_user *tu; |
| 1758 | |
| 1759 | tu = file->private_data; |
| 1760 | if (!tu->timeri) |
| 1761 | return -EBADFD; |
| 1762 | return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; |
| 1763 | } |
| 1764 | |
| 1765 | enum { |
| 1766 | SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), |
| 1767 | SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), |
| 1768 | SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), |
| 1769 | SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), |
| 1770 | }; |
| 1771 | |
| 1772 | static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, |
| 1773 | unsigned long arg) |
| 1774 | { |
| 1775 | struct snd_timer_user *tu; |
| 1776 | void __user *argp = (void __user *)arg; |
| 1777 | int __user *p = argp; |
| 1778 | |
| 1779 | tu = file->private_data; |
| 1780 | switch (cmd) { |
| 1781 | case SNDRV_TIMER_IOCTL_PVERSION: |
| 1782 | return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; |
| 1783 | case SNDRV_TIMER_IOCTL_NEXT_DEVICE: |
| 1784 | return snd_timer_user_next_device(argp); |
| 1785 | case SNDRV_TIMER_IOCTL_TREAD: |
| 1786 | { |
| 1787 | int xarg; |
| 1788 | |
| 1789 | mutex_lock(&tu->tread_sem); |
| 1790 | if (tu->timeri) { /* too late */ |
| 1791 | mutex_unlock(&tu->tread_sem); |
| 1792 | return -EBUSY; |
| 1793 | } |
| 1794 | if (get_user(xarg, p)) { |
| 1795 | mutex_unlock(&tu->tread_sem); |
| 1796 | return -EFAULT; |
| 1797 | } |
| 1798 | tu->tread = xarg ? 1 : 0; |
| 1799 | mutex_unlock(&tu->tread_sem); |
| 1800 | return 0; |
| 1801 | } |
| 1802 | case SNDRV_TIMER_IOCTL_GINFO: |
| 1803 | return snd_timer_user_ginfo(file, argp); |
| 1804 | case SNDRV_TIMER_IOCTL_GPARAMS: |
| 1805 | return snd_timer_user_gparams(file, argp); |
| 1806 | case SNDRV_TIMER_IOCTL_GSTATUS: |
| 1807 | return snd_timer_user_gstatus(file, argp); |
| 1808 | case SNDRV_TIMER_IOCTL_SELECT: |
| 1809 | return snd_timer_user_tselect(file, argp); |
| 1810 | case SNDRV_TIMER_IOCTL_INFO: |
| 1811 | return snd_timer_user_info(file, argp); |
| 1812 | case SNDRV_TIMER_IOCTL_PARAMS: |
| 1813 | return snd_timer_user_params(file, argp); |
| 1814 | case SNDRV_TIMER_IOCTL_STATUS: |
| 1815 | return snd_timer_user_status(file, argp); |
| 1816 | case SNDRV_TIMER_IOCTL_START: |
| 1817 | case SNDRV_TIMER_IOCTL_START_OLD: |
| 1818 | return snd_timer_user_start(file); |
| 1819 | case SNDRV_TIMER_IOCTL_STOP: |
| 1820 | case SNDRV_TIMER_IOCTL_STOP_OLD: |
| 1821 | return snd_timer_user_stop(file); |
| 1822 | case SNDRV_TIMER_IOCTL_CONTINUE: |
| 1823 | case SNDRV_TIMER_IOCTL_CONTINUE_OLD: |
| 1824 | return snd_timer_user_continue(file); |
| 1825 | case SNDRV_TIMER_IOCTL_PAUSE: |
| 1826 | case SNDRV_TIMER_IOCTL_PAUSE_OLD: |
| 1827 | return snd_timer_user_pause(file); |
| 1828 | } |
| 1829 | return -ENOTTY; |
| 1830 | } |
| 1831 | |
| 1832 | static int snd_timer_user_fasync(int fd, struct file * file, int on) |
| 1833 | { |
| 1834 | struct snd_timer_user *tu; |
| 1835 | |
| 1836 | tu = file->private_data; |
| 1837 | return fasync_helper(fd, file, on, &tu->fasync); |
| 1838 | } |
| 1839 | |
| 1840 | static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, |
| 1841 | size_t count, loff_t *offset) |
| 1842 | { |
| 1843 | struct snd_timer_user *tu; |
| 1844 | long result = 0, unit; |
| 1845 | int err = 0; |
| 1846 | |
| 1847 | tu = file->private_data; |
| 1848 | unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); |
| 1849 | spin_lock_irq(&tu->qlock); |
| 1850 | while ((long)count - result >= unit) { |
| 1851 | while (!tu->qused) { |
| 1852 | wait_queue_t wait; |
| 1853 | |
| 1854 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
| 1855 | err = -EAGAIN; |
| 1856 | break; |
| 1857 | } |
| 1858 | |
| 1859 | set_current_state(TASK_INTERRUPTIBLE); |
| 1860 | init_waitqueue_entry(&wait, current); |
| 1861 | add_wait_queue(&tu->qchange_sleep, &wait); |
| 1862 | |
| 1863 | spin_unlock_irq(&tu->qlock); |
| 1864 | schedule(); |
| 1865 | spin_lock_irq(&tu->qlock); |
| 1866 | |
| 1867 | remove_wait_queue(&tu->qchange_sleep, &wait); |
| 1868 | |
| 1869 | if (signal_pending(current)) { |
| 1870 | err = -ERESTARTSYS; |
| 1871 | break; |
| 1872 | } |
| 1873 | } |
| 1874 | |
| 1875 | spin_unlock_irq(&tu->qlock); |
| 1876 | if (err < 0) |
| 1877 | goto _error; |
| 1878 | |
| 1879 | if (tu->tread) { |
| 1880 | if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], |
| 1881 | sizeof(struct snd_timer_tread))) { |
| 1882 | err = -EFAULT; |
| 1883 | goto _error; |
| 1884 | } |
| 1885 | } else { |
| 1886 | if (copy_to_user(buffer, &tu->queue[tu->qhead++], |
| 1887 | sizeof(struct snd_timer_read))) { |
| 1888 | err = -EFAULT; |
| 1889 | goto _error; |
| 1890 | } |
| 1891 | } |
| 1892 | |
| 1893 | tu->qhead %= tu->queue_size; |
| 1894 | |
| 1895 | result += unit; |
| 1896 | buffer += unit; |
| 1897 | |
| 1898 | spin_lock_irq(&tu->qlock); |
| 1899 | tu->qused--; |
| 1900 | } |
| 1901 | spin_unlock_irq(&tu->qlock); |
| 1902 | _error: |
| 1903 | return result > 0 ? result : err; |
| 1904 | } |
| 1905 | |
| 1906 | static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) |
| 1907 | { |
| 1908 | unsigned int mask; |
| 1909 | struct snd_timer_user *tu; |
| 1910 | |
| 1911 | tu = file->private_data; |
| 1912 | |
| 1913 | poll_wait(file, &tu->qchange_sleep, wait); |
| 1914 | |
| 1915 | mask = 0; |
| 1916 | if (tu->qused) |
| 1917 | mask |= POLLIN | POLLRDNORM; |
| 1918 | |
| 1919 | return mask; |
| 1920 | } |
| 1921 | |
| 1922 | #ifdef CONFIG_COMPAT |
| 1923 | #include "timer_compat.c" |
| 1924 | #else |
| 1925 | #define snd_timer_user_ioctl_compat NULL |
| 1926 | #endif |
| 1927 | |
| 1928 | static const struct file_operations snd_timer_f_ops = |
| 1929 | { |
| 1930 | .owner = THIS_MODULE, |
| 1931 | .read = snd_timer_user_read, |
| 1932 | .open = snd_timer_user_open, |
| 1933 | .release = snd_timer_user_release, |
| 1934 | .llseek = no_llseek, |
| 1935 | .poll = snd_timer_user_poll, |
| 1936 | .unlocked_ioctl = snd_timer_user_ioctl, |
| 1937 | .compat_ioctl = snd_timer_user_ioctl_compat, |
| 1938 | .fasync = snd_timer_user_fasync, |
| 1939 | }; |
| 1940 | |
| 1941 | /* unregister the system timer */ |
| 1942 | static void snd_timer_free_all(void) |
| 1943 | { |
| 1944 | struct snd_timer *timer, *n; |
| 1945 | |
| 1946 | list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) |
| 1947 | snd_timer_free(timer); |
| 1948 | } |
| 1949 | |
| 1950 | static struct device timer_dev; |
| 1951 | |
| 1952 | /* |
| 1953 | * ENTRY functions |
| 1954 | */ |
| 1955 | |
| 1956 | static int __init alsa_timer_init(void) |
| 1957 | { |
| 1958 | int err; |
| 1959 | |
| 1960 | snd_device_initialize(&timer_dev, NULL); |
| 1961 | dev_set_name(&timer_dev, "timer"); |
| 1962 | |
| 1963 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
| 1964 | snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, |
| 1965 | "system timer"); |
| 1966 | #endif |
| 1967 | |
| 1968 | err = snd_timer_register_system(); |
| 1969 | if (err < 0) { |
| 1970 | pr_err("ALSA: unable to register system timer (%i)\n", err); |
| 1971 | put_device(&timer_dev); |
| 1972 | return err; |
| 1973 | } |
| 1974 | |
| 1975 | err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, |
| 1976 | &snd_timer_f_ops, NULL, &timer_dev); |
| 1977 | if (err < 0) { |
| 1978 | pr_err("ALSA: unable to register timer device (%i)\n", err); |
| 1979 | snd_timer_free_all(); |
| 1980 | put_device(&timer_dev); |
| 1981 | return err; |
| 1982 | } |
| 1983 | |
| 1984 | snd_timer_proc_init(); |
| 1985 | return 0; |
| 1986 | } |
| 1987 | |
| 1988 | static void __exit alsa_timer_exit(void) |
| 1989 | { |
| 1990 | snd_unregister_device(&timer_dev); |
| 1991 | snd_timer_free_all(); |
| 1992 | put_device(&timer_dev); |
| 1993 | snd_timer_proc_done(); |
| 1994 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
| 1995 | snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); |
| 1996 | #endif |
| 1997 | } |
| 1998 | |
| 1999 | module_init(alsa_timer_init) |
| 2000 | module_exit(alsa_timer_exit) |
| 2001 | |
| 2002 | EXPORT_SYMBOL(snd_timer_open); |
| 2003 | EXPORT_SYMBOL(snd_timer_close); |
| 2004 | EXPORT_SYMBOL(snd_timer_resolution); |
| 2005 | EXPORT_SYMBOL(snd_timer_start); |
| 2006 | EXPORT_SYMBOL(snd_timer_stop); |
| 2007 | EXPORT_SYMBOL(snd_timer_continue); |
| 2008 | EXPORT_SYMBOL(snd_timer_pause); |
| 2009 | EXPORT_SYMBOL(snd_timer_new); |
| 2010 | EXPORT_SYMBOL(snd_timer_notify); |
| 2011 | EXPORT_SYMBOL(snd_timer_global_new); |
| 2012 | EXPORT_SYMBOL(snd_timer_global_free); |
| 2013 | EXPORT_SYMBOL(snd_timer_global_register); |
| 2014 | EXPORT_SYMBOL(snd_timer_interrupt); |