11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Timers abstract layer 3c1017a4cSJaroslav Kysela * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 81da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 91da177e4SLinus Torvalds * (at your option) any later version. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 121da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 131da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141da177e4SLinus Torvalds * GNU General Public License for more details. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 171da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 181da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <linux/delay.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/slab.h> 251da177e4SLinus Torvalds #include <linux/time.h> 261a60d4c5SIngo Molnar #include <linux/mutex.h> 2751990e82SPaul Gortmaker #include <linux/device.h> 2865a77217SPaul Gortmaker #include <linux/module.h> 29543537bdSPaulo Marques #include <linux/string.h> 301da177e4SLinus Torvalds #include <sound/core.h> 311da177e4SLinus Torvalds #include <sound/timer.h> 321da177e4SLinus Torvalds #include <sound/control.h> 331da177e4SLinus Torvalds #include <sound/info.h> 341da177e4SLinus Torvalds #include <sound/minors.h> 351da177e4SLinus Torvalds #include <sound/initval.h> 361da177e4SLinus Torvalds #include <linux/kmod.h> 371da177e4SLinus Torvalds 388eeaa2f9STakashi Iwai #if IS_ENABLED(CONFIG_SND_HRTIMER) 39109fef9eSClemens Ladisch #define DEFAULT_TIMER_LIMIT 4 408eeaa2f9STakashi Iwai #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 411da177e4SLinus Torvalds #define DEFAULT_TIMER_LIMIT 2 421da177e4SLinus Torvalds #else 431da177e4SLinus Torvalds #define DEFAULT_TIMER_LIMIT 1 441da177e4SLinus Torvalds #endif 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static int timer_limit = DEFAULT_TIMER_LIMIT; 47b751eef1SJaroslav Kysela static int timer_tstamp_monotonic = 1; 48c1017a4cSJaroslav Kysela MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 491da177e4SLinus Torvalds MODULE_DESCRIPTION("ALSA timer interface"); 501da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 511da177e4SLinus Torvalds module_param(timer_limit, int, 0444); 521da177e4SLinus Torvalds MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53b751eef1SJaroslav Kysela module_param(timer_tstamp_monotonic, int, 0444); 54b751eef1SJaroslav Kysela MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 551da177e4SLinus Torvalds 5603cfe6f5SKay Sievers MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 5703cfe6f5SKay Sievers MODULE_ALIAS("devname:snd/timer"); 5803cfe6f5SKay Sievers 5953d2f744STakashi Iwai struct snd_timer_user { 6053d2f744STakashi Iwai struct snd_timer_instance *timeri; 611da177e4SLinus Torvalds int tread; /* enhanced read with timestamps and events */ 621da177e4SLinus Torvalds unsigned long ticks; 631da177e4SLinus Torvalds unsigned long overrun; 641da177e4SLinus Torvalds int qhead; 651da177e4SLinus Torvalds int qtail; 661da177e4SLinus Torvalds int qused; 671da177e4SLinus Torvalds int queue_size; 6853d2f744STakashi Iwai struct snd_timer_read *queue; 6953d2f744STakashi Iwai struct snd_timer_tread *tqueue; 701da177e4SLinus Torvalds spinlock_t qlock; 711da177e4SLinus Torvalds unsigned long last_resolution; 721da177e4SLinus Torvalds unsigned int filter; 731da177e4SLinus Torvalds struct timespec tstamp; /* trigger tstamp */ 741da177e4SLinus Torvalds wait_queue_head_t qchange_sleep; 751da177e4SLinus Torvalds struct fasync_struct *fasync; 761a60d4c5SIngo Molnar struct mutex tread_sem; 7753d2f744STakashi Iwai }; 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* list of timers */ 801da177e4SLinus Torvalds static LIST_HEAD(snd_timer_list); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* list of slave instances */ 831da177e4SLinus Torvalds static LIST_HEAD(snd_timer_slave_list); 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds /* lock for slave active lists */ 861da177e4SLinus Torvalds static DEFINE_SPINLOCK(slave_active_lock); 871da177e4SLinus Torvalds 881a60d4c5SIngo Molnar static DEFINE_MUTEX(register_mutex); 891da177e4SLinus Torvalds 9053d2f744STakashi Iwai static int snd_timer_free(struct snd_timer *timer); 9153d2f744STakashi Iwai static int snd_timer_dev_free(struct snd_device *device); 9253d2f744STakashi Iwai static int snd_timer_dev_register(struct snd_device *device); 93c461482cSTakashi Iwai static int snd_timer_dev_disconnect(struct snd_device *device); 941da177e4SLinus Torvalds 9553d2f744STakashi Iwai static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* 981da177e4SLinus Torvalds * create a timer instance with the given owner string. 991da177e4SLinus Torvalds * when timer is not NULL, increments the module counter 1001da177e4SLinus Torvalds */ 10153d2f744STakashi Iwai static struct snd_timer_instance *snd_timer_instance_new(char *owner, 10253d2f744STakashi Iwai struct snd_timer *timer) 1031da177e4SLinus Torvalds { 10453d2f744STakashi Iwai struct snd_timer_instance *timeri; 105ca2c0966STakashi Iwai timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 1061da177e4SLinus Torvalds if (timeri == NULL) 1071da177e4SLinus Torvalds return NULL; 108543537bdSPaulo Marques timeri->owner = kstrdup(owner, GFP_KERNEL); 1091da177e4SLinus Torvalds if (! timeri->owner) { 1101da177e4SLinus Torvalds kfree(timeri); 1111da177e4SLinus Torvalds return NULL; 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds INIT_LIST_HEAD(&timeri->open_list); 1141da177e4SLinus Torvalds INIT_LIST_HEAD(&timeri->active_list); 1151da177e4SLinus Torvalds INIT_LIST_HEAD(&timeri->ack_list); 1161da177e4SLinus Torvalds INIT_LIST_HEAD(&timeri->slave_list_head); 1171da177e4SLinus Torvalds INIT_LIST_HEAD(&timeri->slave_active_head); 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds timeri->timer = timer; 120de24214dSClemens Ladisch if (timer && !try_module_get(timer->module)) { 1211da177e4SLinus Torvalds kfree(timeri->owner); 1221da177e4SLinus Torvalds kfree(timeri); 1231da177e4SLinus Torvalds return NULL; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds return timeri; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds /* 1301da177e4SLinus Torvalds * find a timer instance from the given timer id 1311da177e4SLinus Torvalds */ 13253d2f744STakashi Iwai static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 1331da177e4SLinus Torvalds { 13453d2f744STakashi Iwai struct snd_timer *timer = NULL; 1351da177e4SLinus Torvalds 1369244b2c3SJohannes Berg list_for_each_entry(timer, &snd_timer_list, device_list) { 1371da177e4SLinus Torvalds if (timer->tmr_class != tid->dev_class) 1381da177e4SLinus Torvalds continue; 1391da177e4SLinus Torvalds if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 1401da177e4SLinus Torvalds timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 1411da177e4SLinus Torvalds (timer->card == NULL || 1421da177e4SLinus Torvalds timer->card->number != tid->card)) 1431da177e4SLinus Torvalds continue; 1441da177e4SLinus Torvalds if (timer->tmr_device != tid->device) 1451da177e4SLinus Torvalds continue; 1461da177e4SLinus Torvalds if (timer->tmr_subdevice != tid->subdevice) 1471da177e4SLinus Torvalds continue; 1481da177e4SLinus Torvalds return timer; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds return NULL; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 153ee2da997SJohannes Berg #ifdef CONFIG_MODULES 1541da177e4SLinus Torvalds 15553d2f744STakashi Iwai static void snd_timer_request(struct snd_timer_id *tid) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds switch (tid->dev_class) { 1581da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_GLOBAL: 1591da177e4SLinus Torvalds if (tid->device < timer_limit) 1601da177e4SLinus Torvalds request_module("snd-timer-%i", tid->device); 1611da177e4SLinus Torvalds break; 1621da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_CARD: 1631da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_PCM: 1641da177e4SLinus Torvalds if (tid->card < snd_ecards_limit) 1651da177e4SLinus Torvalds request_module("snd-card-%i", tid->card); 1661da177e4SLinus Torvalds break; 1671da177e4SLinus Torvalds default: 1681da177e4SLinus Torvalds break; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds #endif 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * look for a master instance matching with the slave id of the given slave. 1761da177e4SLinus Torvalds * when found, relink the open_link of the slave. 1771da177e4SLinus Torvalds * 1781da177e4SLinus Torvalds * call this with register_mutex down. 1791da177e4SLinus Torvalds */ 18053d2f744STakashi Iwai static void snd_timer_check_slave(struct snd_timer_instance *slave) 1811da177e4SLinus Torvalds { 18253d2f744STakashi Iwai struct snd_timer *timer; 18353d2f744STakashi Iwai struct snd_timer_instance *master; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* FIXME: it's really dumb to look up all entries.. */ 1869244b2c3SJohannes Berg list_for_each_entry(timer, &snd_timer_list, device_list) { 1879244b2c3SJohannes Berg list_for_each_entry(master, &timer->open_list_head, open_list) { 1881da177e4SLinus Torvalds if (slave->slave_class == master->slave_class && 1891da177e4SLinus Torvalds slave->slave_id == master->slave_id) { 1905b7c757dSNicolas Kaiser list_move_tail(&slave->open_list, 1916b172a85SClemens Ladisch &master->slave_list_head); 1921da177e4SLinus Torvalds spin_lock_irq(&slave_active_lock); 1931da177e4SLinus Torvalds slave->master = master; 1941da177e4SLinus Torvalds slave->timer = master->timer; 1951da177e4SLinus Torvalds spin_unlock_irq(&slave_active_lock); 1961da177e4SLinus Torvalds return; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * look for slave instances matching with the slave id of the given master. 2041da177e4SLinus Torvalds * when found, relink the open_link of slaves. 2051da177e4SLinus Torvalds * 2061da177e4SLinus Torvalds * call this with register_mutex down. 2071da177e4SLinus Torvalds */ 20853d2f744STakashi Iwai static void snd_timer_check_master(struct snd_timer_instance *master) 2091da177e4SLinus Torvalds { 2109244b2c3SJohannes Berg struct snd_timer_instance *slave, *tmp; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* check all pending slaves */ 2139244b2c3SJohannes Berg list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 2141da177e4SLinus Torvalds if (slave->slave_class == master->slave_class && 2151da177e4SLinus Torvalds slave->slave_id == master->slave_id) { 2169244b2c3SJohannes Berg list_move_tail(&slave->open_list, &master->slave_list_head); 2171da177e4SLinus Torvalds spin_lock_irq(&slave_active_lock); 2181da177e4SLinus Torvalds slave->master = master; 2191da177e4SLinus Torvalds slave->timer = master->timer; 2201da177e4SLinus Torvalds if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 2216b172a85SClemens Ladisch list_add_tail(&slave->active_list, 2226b172a85SClemens Ladisch &master->slave_active_head); 2231da177e4SLinus Torvalds spin_unlock_irq(&slave_active_lock); 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * open a timer instance 2301da177e4SLinus Torvalds * when opening a master, the slave id must be here given. 2311da177e4SLinus Torvalds */ 23253d2f744STakashi Iwai int snd_timer_open(struct snd_timer_instance **ti, 23353d2f744STakashi Iwai char *owner, struct snd_timer_id *tid, 2341da177e4SLinus Torvalds unsigned int slave_id) 2351da177e4SLinus Torvalds { 23653d2f744STakashi Iwai struct snd_timer *timer; 23753d2f744STakashi Iwai struct snd_timer_instance *timeri = NULL; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 2401da177e4SLinus Torvalds /* open a slave instance */ 2411da177e4SLinus Torvalds if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 2421da177e4SLinus Torvalds tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 243cf74dcf3STakashi Iwai pr_debug("ALSA: timer: invalid slave class %i\n", 244cf74dcf3STakashi Iwai tid->dev_sclass); 2451da177e4SLinus Torvalds return -EINVAL; 2461da177e4SLinus Torvalds } 2471a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 2481da177e4SLinus Torvalds timeri = snd_timer_instance_new(owner, NULL); 2492fd43d11SClemens Ladisch if (!timeri) { 2501a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2512fd43d11SClemens Ladisch return -ENOMEM; 2522fd43d11SClemens Ladisch } 2531da177e4SLinus Torvalds timeri->slave_class = tid->dev_sclass; 2541da177e4SLinus Torvalds timeri->slave_id = tid->device; 2551da177e4SLinus Torvalds timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 2561da177e4SLinus Torvalds list_add_tail(&timeri->open_list, &snd_timer_slave_list); 2571da177e4SLinus Torvalds snd_timer_check_slave(timeri); 2581a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2591da177e4SLinus Torvalds *ti = timeri; 2601da177e4SLinus Torvalds return 0; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* open a master instance */ 2641a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 2651da177e4SLinus Torvalds timer = snd_timer_find(tid); 266ee2da997SJohannes Berg #ifdef CONFIG_MODULES 267ee2da997SJohannes Berg if (!timer) { 2681a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2691da177e4SLinus Torvalds snd_timer_request(tid); 2701a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 2711da177e4SLinus Torvalds timer = snd_timer_find(tid); 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds #endif 2742fd43d11SClemens Ladisch if (!timer) { 2751a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2762fd43d11SClemens Ladisch return -ENODEV; 2772fd43d11SClemens Ladisch } 2781da177e4SLinus Torvalds if (!list_empty(&timer->open_list_head)) { 2792fd43d11SClemens Ladisch timeri = list_entry(timer->open_list_head.next, 28053d2f744STakashi Iwai struct snd_timer_instance, open_list); 2811da177e4SLinus Torvalds if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 2821a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2831da177e4SLinus Torvalds return -EBUSY; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds timeri = snd_timer_instance_new(owner, timer); 2872fd43d11SClemens Ladisch if (!timeri) { 2881a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2892fd43d11SClemens Ladisch return -ENOMEM; 2902fd43d11SClemens Ladisch } 2911da177e4SLinus Torvalds timeri->slave_class = tid->dev_sclass; 2921da177e4SLinus Torvalds timeri->slave_id = slave_id; 2931da177e4SLinus Torvalds if (list_empty(&timer->open_list_head) && timer->hw.open) 2941da177e4SLinus Torvalds timer->hw.open(timer); 2951da177e4SLinus Torvalds list_add_tail(&timeri->open_list, &timer->open_list_head); 2961da177e4SLinus Torvalds snd_timer_check_master(timeri); 2971a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 2981da177e4SLinus Torvalds *ti = timeri; 2991da177e4SLinus Torvalds return 0; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 30253d2f744STakashi Iwai static int _snd_timer_stop(struct snd_timer_instance *timeri, 30353d2f744STakashi Iwai int keep_flag, int event); 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* 3061da177e4SLinus Torvalds * close a timer instance 3071da177e4SLinus Torvalds */ 30853d2f744STakashi Iwai int snd_timer_close(struct snd_timer_instance *timeri) 3091da177e4SLinus Torvalds { 31053d2f744STakashi Iwai struct snd_timer *timer = NULL; 3119244b2c3SJohannes Berg struct snd_timer_instance *slave, *tmp; 3121da177e4SLinus Torvalds 3130072889aSTakashi Iwai if (snd_BUG_ON(!timeri)) 3147eaa943cSTakashi Iwai return -ENXIO; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds /* force to stop the timer */ 3171da177e4SLinus Torvalds snd_timer_stop(timeri); 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 3201da177e4SLinus Torvalds /* wait, until the active callback is finished */ 3211da177e4SLinus Torvalds spin_lock_irq(&slave_active_lock); 3221da177e4SLinus Torvalds while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 3231da177e4SLinus Torvalds spin_unlock_irq(&slave_active_lock); 3241da177e4SLinus Torvalds udelay(10); 3251da177e4SLinus Torvalds spin_lock_irq(&slave_active_lock); 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds spin_unlock_irq(&slave_active_lock); 3281a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 3291da177e4SLinus Torvalds list_del(&timeri->open_list); 3301a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 3311da177e4SLinus Torvalds } else { 3321da177e4SLinus Torvalds timer = timeri->timer; 33394094c8aSTakashi Iwai if (snd_BUG_ON(!timer)) 33494094c8aSTakashi Iwai goto out; 3351da177e4SLinus Torvalds /* wait, until the active callback is finished */ 3361da177e4SLinus Torvalds spin_lock_irq(&timer->lock); 3371da177e4SLinus Torvalds while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 3381da177e4SLinus Torvalds spin_unlock_irq(&timer->lock); 3391da177e4SLinus Torvalds udelay(10); 3401da177e4SLinus Torvalds spin_lock_irq(&timer->lock); 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds spin_unlock_irq(&timer->lock); 3431a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 3441da177e4SLinus Torvalds list_del(&timeri->open_list); 3456b172a85SClemens Ladisch if (timer && list_empty(&timer->open_list_head) && 3466b172a85SClemens Ladisch timer->hw.close) 3471da177e4SLinus Torvalds timer->hw.close(timer); 3481da177e4SLinus Torvalds /* remove slave links */ 3499244b2c3SJohannes Berg list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 3509244b2c3SJohannes Berg open_list) { 3511da177e4SLinus Torvalds spin_lock_irq(&slave_active_lock); 3521da177e4SLinus Torvalds _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 3539244b2c3SJohannes Berg list_move_tail(&slave->open_list, &snd_timer_slave_list); 3541da177e4SLinus Torvalds slave->master = NULL; 3551da177e4SLinus Torvalds slave->timer = NULL; 3561da177e4SLinus Torvalds spin_unlock_irq(&slave_active_lock); 3571da177e4SLinus Torvalds } 3581a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 3591da177e4SLinus Torvalds } 36094094c8aSTakashi Iwai out: 3611da177e4SLinus Torvalds if (timeri->private_free) 3621da177e4SLinus Torvalds timeri->private_free(timeri); 3631da177e4SLinus Torvalds kfree(timeri->owner); 3641da177e4SLinus Torvalds kfree(timeri); 365de24214dSClemens Ladisch if (timer) 366de24214dSClemens Ladisch module_put(timer->module); 3671da177e4SLinus Torvalds return 0; 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 37053d2f744STakashi Iwai unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 3711da177e4SLinus Torvalds { 37253d2f744STakashi Iwai struct snd_timer * timer; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds if (timeri == NULL) 3751da177e4SLinus Torvalds return 0; 3761da177e4SLinus Torvalds if ((timer = timeri->timer) != NULL) { 3771da177e4SLinus Torvalds if (timer->hw.c_resolution) 3781da177e4SLinus Torvalds return timer->hw.c_resolution(timer); 3791da177e4SLinus Torvalds return timer->hw.resolution; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds return 0; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 38453d2f744STakashi Iwai static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 3851da177e4SLinus Torvalds { 38653d2f744STakashi Iwai struct snd_timer *timer; 3871da177e4SLinus Torvalds unsigned long flags; 3881da177e4SLinus Torvalds unsigned long resolution = 0; 38953d2f744STakashi Iwai struct snd_timer_instance *ts; 3901da177e4SLinus Torvalds struct timespec tstamp; 3911da177e4SLinus Torvalds 392b751eef1SJaroslav Kysela if (timer_tstamp_monotonic) 39326204e04SThomas Gleixner ktime_get_ts(&tstamp); 394b751eef1SJaroslav Kysela else 39507799e75STakashi Iwai getnstimeofday(&tstamp); 3967eaa943cSTakashi Iwai if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 3977eaa943cSTakashi Iwai event > SNDRV_TIMER_EVENT_PAUSE)) 3987eaa943cSTakashi Iwai return; 3996b172a85SClemens Ladisch if (event == SNDRV_TIMER_EVENT_START || 4006b172a85SClemens Ladisch event == SNDRV_TIMER_EVENT_CONTINUE) 4011da177e4SLinus Torvalds resolution = snd_timer_resolution(ti); 4021da177e4SLinus Torvalds if (ti->ccallback) 403b30477d5SJaroslav Kysela ti->ccallback(ti, event, &tstamp, resolution); 4041da177e4SLinus Torvalds if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 4051da177e4SLinus Torvalds return; 4061da177e4SLinus Torvalds timer = ti->timer; 4071da177e4SLinus Torvalds if (timer == NULL) 4081da177e4SLinus Torvalds return; 4091da177e4SLinus Torvalds if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 4101da177e4SLinus Torvalds return; 4111da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 4129244b2c3SJohannes Berg list_for_each_entry(ts, &ti->slave_active_head, active_list) 4131da177e4SLinus Torvalds if (ts->ccallback) 4141da177e4SLinus Torvalds ts->ccallback(ti, event + 100, &tstamp, resolution); 4151da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 41853d2f744STakashi Iwai static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 4196b172a85SClemens Ladisch unsigned long sticks) 4201da177e4SLinus Torvalds { 4215b7c757dSNicolas Kaiser list_move_tail(&timeri->active_list, &timer->active_list_head); 4221da177e4SLinus Torvalds if (timer->running) { 4231da177e4SLinus Torvalds if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 4241da177e4SLinus Torvalds goto __start_now; 4251da177e4SLinus Torvalds timer->flags |= SNDRV_TIMER_FLG_RESCHED; 4261da177e4SLinus Torvalds timeri->flags |= SNDRV_TIMER_IFLG_START; 4271da177e4SLinus Torvalds return 1; /* delayed start */ 4281da177e4SLinus Torvalds } else { 4291da177e4SLinus Torvalds timer->sticks = sticks; 4301da177e4SLinus Torvalds timer->hw.start(timer); 4311da177e4SLinus Torvalds __start_now: 4321da177e4SLinus Torvalds timer->running++; 4331da177e4SLinus Torvalds timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 4341da177e4SLinus Torvalds return 0; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 43853d2f744STakashi Iwai static int snd_timer_start_slave(struct snd_timer_instance *timeri) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds unsigned long flags; 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds spin_lock_irqsave(&slave_active_lock, flags); 4431da177e4SLinus Torvalds timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 4441da177e4SLinus Torvalds if (timeri->master) 4456b172a85SClemens Ladisch list_add_tail(&timeri->active_list, 4466b172a85SClemens Ladisch &timeri->master->slave_active_head); 4471da177e4SLinus Torvalds spin_unlock_irqrestore(&slave_active_lock, flags); 4481da177e4SLinus Torvalds return 1; /* delayed start */ 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds /* 4521da177e4SLinus Torvalds * start the timer instance 4531da177e4SLinus Torvalds */ 45453d2f744STakashi Iwai int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 4551da177e4SLinus Torvalds { 45653d2f744STakashi Iwai struct snd_timer *timer; 4571da177e4SLinus Torvalds int result = -EINVAL; 4581da177e4SLinus Torvalds unsigned long flags; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds if (timeri == NULL || ticks < 1) 4611da177e4SLinus Torvalds return -EINVAL; 4621da177e4SLinus Torvalds if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 4631da177e4SLinus Torvalds result = snd_timer_start_slave(timeri); 4641da177e4SLinus Torvalds snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 4651da177e4SLinus Torvalds return result; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds timer = timeri->timer; 4681da177e4SLinus Torvalds if (timer == NULL) 4691da177e4SLinus Torvalds return -EINVAL; 4701da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 4711da177e4SLinus Torvalds timeri->ticks = timeri->cticks = ticks; 4721da177e4SLinus Torvalds timeri->pticks = 0; 4731da177e4SLinus Torvalds result = snd_timer_start1(timer, timeri, ticks); 4741da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 4751da177e4SLinus Torvalds snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 4761da177e4SLinus Torvalds return result; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 47953d2f744STakashi Iwai static int _snd_timer_stop(struct snd_timer_instance * timeri, 48053d2f744STakashi Iwai int keep_flag, int event) 4811da177e4SLinus Torvalds { 48253d2f744STakashi Iwai struct snd_timer *timer; 4831da177e4SLinus Torvalds unsigned long flags; 4841da177e4SLinus Torvalds 4857eaa943cSTakashi Iwai if (snd_BUG_ON(!timeri)) 4867eaa943cSTakashi Iwai return -ENXIO; 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 4891da177e4SLinus Torvalds if (!keep_flag) { 4901da177e4SLinus Torvalds spin_lock_irqsave(&slave_active_lock, flags); 4911da177e4SLinus Torvalds timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 4921da177e4SLinus Torvalds spin_unlock_irqrestore(&slave_active_lock, flags); 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds goto __end; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds timer = timeri->timer; 4971da177e4SLinus Torvalds if (!timer) 4981da177e4SLinus Torvalds return -EINVAL; 4991da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 5001da177e4SLinus Torvalds list_del_init(&timeri->ack_list); 5011da177e4SLinus Torvalds list_del_init(&timeri->active_list); 5021da177e4SLinus Torvalds if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 5031da177e4SLinus Torvalds !(--timer->running)) { 5041da177e4SLinus Torvalds timer->hw.stop(timer); 5051da177e4SLinus Torvalds if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 5061da177e4SLinus Torvalds timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 5071da177e4SLinus Torvalds snd_timer_reschedule(timer, 0); 5081da177e4SLinus Torvalds if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 5091da177e4SLinus Torvalds timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 5101da177e4SLinus Torvalds timer->hw.start(timer); 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds if (!keep_flag) 5156b172a85SClemens Ladisch timeri->flags &= 5166b172a85SClemens Ladisch ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 5171da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 5181da177e4SLinus Torvalds __end: 5191da177e4SLinus Torvalds if (event != SNDRV_TIMER_EVENT_RESOLUTION) 5201da177e4SLinus Torvalds snd_timer_notify1(timeri, event); 5211da177e4SLinus Torvalds return 0; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* 5251da177e4SLinus Torvalds * stop the timer instance. 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * do not call this from the timer callback! 5281da177e4SLinus Torvalds */ 52953d2f744STakashi Iwai int snd_timer_stop(struct snd_timer_instance *timeri) 5301da177e4SLinus Torvalds { 53153d2f744STakashi Iwai struct snd_timer *timer; 5321da177e4SLinus Torvalds unsigned long flags; 5331da177e4SLinus Torvalds int err; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 5361da177e4SLinus Torvalds if (err < 0) 5371da177e4SLinus Torvalds return err; 5381da177e4SLinus Torvalds timer = timeri->timer; 5390584ffa5STakashi Iwai if (!timer) 5400584ffa5STakashi Iwai return -EINVAL; 5411da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 5421da177e4SLinus Torvalds timeri->cticks = timeri->ticks; 5431da177e4SLinus Torvalds timeri->pticks = 0; 5441da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 5451da177e4SLinus Torvalds return 0; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds /* 5491da177e4SLinus Torvalds * start again.. the tick is kept. 5501da177e4SLinus Torvalds */ 55153d2f744STakashi Iwai int snd_timer_continue(struct snd_timer_instance *timeri) 5521da177e4SLinus Torvalds { 55353d2f744STakashi Iwai struct snd_timer *timer; 5541da177e4SLinus Torvalds int result = -EINVAL; 5551da177e4SLinus Torvalds unsigned long flags; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds if (timeri == NULL) 5581da177e4SLinus Torvalds return result; 5591da177e4SLinus Torvalds if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 5601da177e4SLinus Torvalds return snd_timer_start_slave(timeri); 5611da177e4SLinus Torvalds timer = timeri->timer; 5621da177e4SLinus Torvalds if (! timer) 5631da177e4SLinus Torvalds return -EINVAL; 5641da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 5651da177e4SLinus Torvalds if (!timeri->cticks) 5661da177e4SLinus Torvalds timeri->cticks = 1; 5671da177e4SLinus Torvalds timeri->pticks = 0; 5681da177e4SLinus Torvalds result = snd_timer_start1(timer, timeri, timer->sticks); 5691da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 5701da177e4SLinus Torvalds snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 5711da177e4SLinus Torvalds return result; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* 5751da177e4SLinus Torvalds * pause.. remember the ticks left 5761da177e4SLinus Torvalds */ 57753d2f744STakashi Iwai int snd_timer_pause(struct snd_timer_instance * timeri) 5781da177e4SLinus Torvalds { 5791da177e4SLinus Torvalds return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* 5831da177e4SLinus Torvalds * reschedule the timer 5841da177e4SLinus Torvalds * 5851da177e4SLinus Torvalds * start pending instances and check the scheduling ticks. 5861da177e4SLinus Torvalds * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 5871da177e4SLinus Torvalds */ 58853d2f744STakashi Iwai static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 5891da177e4SLinus Torvalds { 59053d2f744STakashi Iwai struct snd_timer_instance *ti; 5911da177e4SLinus Torvalds unsigned long ticks = ~0UL; 5921da177e4SLinus Torvalds 5939244b2c3SJohannes Berg list_for_each_entry(ti, &timer->active_list_head, active_list) { 5941da177e4SLinus Torvalds if (ti->flags & SNDRV_TIMER_IFLG_START) { 5951da177e4SLinus Torvalds ti->flags &= ~SNDRV_TIMER_IFLG_START; 5961da177e4SLinus Torvalds ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 5971da177e4SLinus Torvalds timer->running++; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 6001da177e4SLinus Torvalds if (ticks > ti->cticks) 6011da177e4SLinus Torvalds ticks = ti->cticks; 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds if (ticks == ~0UL) { 6051da177e4SLinus Torvalds timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 6061da177e4SLinus Torvalds return; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds if (ticks > timer->hw.ticks) 6091da177e4SLinus Torvalds ticks = timer->hw.ticks; 6101da177e4SLinus Torvalds if (ticks_left != ticks) 6111da177e4SLinus Torvalds timer->flags |= SNDRV_TIMER_FLG_CHANGE; 6121da177e4SLinus Torvalds timer->sticks = ticks; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* 6161da177e4SLinus Torvalds * timer tasklet 6171da177e4SLinus Torvalds * 6181da177e4SLinus Torvalds */ 6191da177e4SLinus Torvalds static void snd_timer_tasklet(unsigned long arg) 6201da177e4SLinus Torvalds { 62153d2f744STakashi Iwai struct snd_timer *timer = (struct snd_timer *) arg; 62253d2f744STakashi Iwai struct snd_timer_instance *ti; 6231da177e4SLinus Torvalds struct list_head *p; 6241da177e4SLinus Torvalds unsigned long resolution, ticks; 6252999ff5bSTakashi Iwai unsigned long flags; 6261da177e4SLinus Torvalds 6272999ff5bSTakashi Iwai spin_lock_irqsave(&timer->lock, flags); 6281da177e4SLinus Torvalds /* now process all callbacks */ 6291da177e4SLinus Torvalds while (!list_empty(&timer->sack_list_head)) { 6301da177e4SLinus Torvalds p = timer->sack_list_head.next; /* get first item */ 63153d2f744STakashi Iwai ti = list_entry(p, struct snd_timer_instance, ack_list); 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* remove from ack_list and make empty */ 6341da177e4SLinus Torvalds list_del_init(p); 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds ticks = ti->pticks; 6371da177e4SLinus Torvalds ti->pticks = 0; 6381da177e4SLinus Torvalds resolution = ti->resolution; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 6411da177e4SLinus Torvalds spin_unlock(&timer->lock); 6421da177e4SLinus Torvalds if (ti->callback) 6431da177e4SLinus Torvalds ti->callback(ti, resolution, ticks); 6441da177e4SLinus Torvalds spin_lock(&timer->lock); 6451da177e4SLinus Torvalds ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 6461da177e4SLinus Torvalds } 6472999ff5bSTakashi Iwai spin_unlock_irqrestore(&timer->lock, flags); 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds /* 6511da177e4SLinus Torvalds * timer interrupt 6521da177e4SLinus Torvalds * 6531da177e4SLinus Torvalds * ticks_left is usually equal to timer->sticks. 6541da177e4SLinus Torvalds * 6551da177e4SLinus Torvalds */ 65653d2f744STakashi Iwai void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 6571da177e4SLinus Torvalds { 6589244b2c3SJohannes Berg struct snd_timer_instance *ti, *ts, *tmp; 6591da177e4SLinus Torvalds unsigned long resolution, ticks; 6609244b2c3SJohannes Berg struct list_head *p, *ack_list_head; 661b32425acSTakashi Iwai unsigned long flags; 6621da177e4SLinus Torvalds int use_tasklet = 0; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds if (timer == NULL) 6651da177e4SLinus Torvalds return; 6661da177e4SLinus Torvalds 667b32425acSTakashi Iwai spin_lock_irqsave(&timer->lock, flags); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* remember the current resolution */ 6701da177e4SLinus Torvalds if (timer->hw.c_resolution) 6711da177e4SLinus Torvalds resolution = timer->hw.c_resolution(timer); 6721da177e4SLinus Torvalds else 6731da177e4SLinus Torvalds resolution = timer->hw.resolution; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* loop for all active instances 6769244b2c3SJohannes Berg * Here we cannot use list_for_each_entry because the active_list of a 6776b172a85SClemens Ladisch * processed instance is relinked to done_list_head before the callback 6786b172a85SClemens Ladisch * is called. 6791da177e4SLinus Torvalds */ 6809244b2c3SJohannes Berg list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 6819244b2c3SJohannes Berg active_list) { 6821da177e4SLinus Torvalds if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 6831da177e4SLinus Torvalds continue; 6841da177e4SLinus Torvalds ti->pticks += ticks_left; 6851da177e4SLinus Torvalds ti->resolution = resolution; 6861da177e4SLinus Torvalds if (ti->cticks < ticks_left) 6871da177e4SLinus Torvalds ti->cticks = 0; 6881da177e4SLinus Torvalds else 6891da177e4SLinus Torvalds ti->cticks -= ticks_left; 6901da177e4SLinus Torvalds if (ti->cticks) /* not expired */ 6911da177e4SLinus Torvalds continue; 6921da177e4SLinus Torvalds if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 6931da177e4SLinus Torvalds ti->cticks = ti->ticks; 6941da177e4SLinus Torvalds } else { 6951da177e4SLinus Torvalds ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 6961da177e4SLinus Torvalds if (--timer->running) 6979244b2c3SJohannes Berg list_del(&ti->active_list); 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 7006b172a85SClemens Ladisch (ti->flags & SNDRV_TIMER_IFLG_FAST)) 7016b172a85SClemens Ladisch ack_list_head = &timer->ack_list_head; 7026b172a85SClemens Ladisch else 7036b172a85SClemens Ladisch ack_list_head = &timer->sack_list_head; 7046b172a85SClemens Ladisch if (list_empty(&ti->ack_list)) 7056b172a85SClemens Ladisch list_add_tail(&ti->ack_list, ack_list_head); 7069244b2c3SJohannes Berg list_for_each_entry(ts, &ti->slave_active_head, active_list) { 7071da177e4SLinus Torvalds ts->pticks = ti->pticks; 7081da177e4SLinus Torvalds ts->resolution = resolution; 7096b172a85SClemens Ladisch if (list_empty(&ts->ack_list)) 7106b172a85SClemens Ladisch list_add_tail(&ts->ack_list, ack_list_head); 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 714cd93fe47SClemens Ladisch snd_timer_reschedule(timer, timer->sticks); 7151da177e4SLinus Torvalds if (timer->running) { 7161da177e4SLinus Torvalds if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 7171da177e4SLinus Torvalds timer->hw.stop(timer); 7181da177e4SLinus Torvalds timer->flags |= SNDRV_TIMER_FLG_CHANGE; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 7211da177e4SLinus Torvalds (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 7221da177e4SLinus Torvalds /* restart timer */ 7231da177e4SLinus Torvalds timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 7241da177e4SLinus Torvalds timer->hw.start(timer); 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds } else { 7271da177e4SLinus Torvalds timer->hw.stop(timer); 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* now process all fast callbacks */ 7311da177e4SLinus Torvalds while (!list_empty(&timer->ack_list_head)) { 7321da177e4SLinus Torvalds p = timer->ack_list_head.next; /* get first item */ 73353d2f744STakashi Iwai ti = list_entry(p, struct snd_timer_instance, ack_list); 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds /* remove from ack_list and make empty */ 7361da177e4SLinus Torvalds list_del_init(p); 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds ticks = ti->pticks; 7391da177e4SLinus Torvalds ti->pticks = 0; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 7421da177e4SLinus Torvalds spin_unlock(&timer->lock); 7431da177e4SLinus Torvalds if (ti->callback) 7441da177e4SLinus Torvalds ti->callback(ti, resolution, ticks); 7451da177e4SLinus Torvalds spin_lock(&timer->lock); 7461da177e4SLinus Torvalds ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* do we have any slow callbacks? */ 7501da177e4SLinus Torvalds use_tasklet = !list_empty(&timer->sack_list_head); 751b32425acSTakashi Iwai spin_unlock_irqrestore(&timer->lock, flags); 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds if (use_tasklet) 7541f04128aSTakashi Iwai tasklet_schedule(&timer->task_queue); 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds */ 7601da177e4SLinus Torvalds 76153d2f744STakashi Iwai int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 76253d2f744STakashi Iwai struct snd_timer **rtimer) 7631da177e4SLinus Torvalds { 76453d2f744STakashi Iwai struct snd_timer *timer; 7651da177e4SLinus Torvalds int err; 76653d2f744STakashi Iwai static struct snd_device_ops ops = { 7671da177e4SLinus Torvalds .dev_free = snd_timer_dev_free, 7681da177e4SLinus Torvalds .dev_register = snd_timer_dev_register, 769c461482cSTakashi Iwai .dev_disconnect = snd_timer_dev_disconnect, 7701da177e4SLinus Torvalds }; 7711da177e4SLinus Torvalds 7727eaa943cSTakashi Iwai if (snd_BUG_ON(!tid)) 7737eaa943cSTakashi Iwai return -EINVAL; 7747eaa943cSTakashi Iwai if (rtimer) 7751da177e4SLinus Torvalds *rtimer = NULL; 776ca2c0966STakashi Iwai timer = kzalloc(sizeof(*timer), GFP_KERNEL); 77773e77ba0STakashi Iwai if (timer == NULL) { 778cf74dcf3STakashi Iwai pr_err("ALSA: timer: cannot allocate\n"); 7791da177e4SLinus Torvalds return -ENOMEM; 78073e77ba0STakashi Iwai } 7811da177e4SLinus Torvalds timer->tmr_class = tid->dev_class; 7821da177e4SLinus Torvalds timer->card = card; 7831da177e4SLinus Torvalds timer->tmr_device = tid->device; 7841da177e4SLinus Torvalds timer->tmr_subdevice = tid->subdevice; 7851da177e4SLinus Torvalds if (id) 7861da177e4SLinus Torvalds strlcpy(timer->id, id, sizeof(timer->id)); 7871da177e4SLinus Torvalds INIT_LIST_HEAD(&timer->device_list); 7881da177e4SLinus Torvalds INIT_LIST_HEAD(&timer->open_list_head); 7891da177e4SLinus Torvalds INIT_LIST_HEAD(&timer->active_list_head); 7901da177e4SLinus Torvalds INIT_LIST_HEAD(&timer->ack_list_head); 7911da177e4SLinus Torvalds INIT_LIST_HEAD(&timer->sack_list_head); 7921da177e4SLinus Torvalds spin_lock_init(&timer->lock); 7936b172a85SClemens Ladisch tasklet_init(&timer->task_queue, snd_timer_tasklet, 7946b172a85SClemens Ladisch (unsigned long)timer); 7951da177e4SLinus Torvalds if (card != NULL) { 796de24214dSClemens Ladisch timer->module = card->module; 7976b172a85SClemens Ladisch err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 7986b172a85SClemens Ladisch if (err < 0) { 7991da177e4SLinus Torvalds snd_timer_free(timer); 8001da177e4SLinus Torvalds return err; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds } 8037eaa943cSTakashi Iwai if (rtimer) 8041da177e4SLinus Torvalds *rtimer = timer; 8051da177e4SLinus Torvalds return 0; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 80853d2f744STakashi Iwai static int snd_timer_free(struct snd_timer *timer) 8091da177e4SLinus Torvalds { 8107eaa943cSTakashi Iwai if (!timer) 8117eaa943cSTakashi Iwai return 0; 812c461482cSTakashi Iwai 813c461482cSTakashi Iwai mutex_lock(®ister_mutex); 814c461482cSTakashi Iwai if (! list_empty(&timer->open_list_head)) { 815c461482cSTakashi Iwai struct list_head *p, *n; 816c461482cSTakashi Iwai struct snd_timer_instance *ti; 817cf74dcf3STakashi Iwai pr_warn("ALSA: timer %p is busy?\n", timer); 818c461482cSTakashi Iwai list_for_each_safe(p, n, &timer->open_list_head) { 819c461482cSTakashi Iwai list_del_init(p); 820c461482cSTakashi Iwai ti = list_entry(p, struct snd_timer_instance, open_list); 821c461482cSTakashi Iwai ti->timer = NULL; 822c461482cSTakashi Iwai } 823c461482cSTakashi Iwai } 824c461482cSTakashi Iwai list_del(&timer->device_list); 825c461482cSTakashi Iwai mutex_unlock(®ister_mutex); 826c461482cSTakashi Iwai 8271da177e4SLinus Torvalds if (timer->private_free) 8281da177e4SLinus Torvalds timer->private_free(timer); 8291da177e4SLinus Torvalds kfree(timer); 8301da177e4SLinus Torvalds return 0; 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 83353d2f744STakashi Iwai static int snd_timer_dev_free(struct snd_device *device) 8341da177e4SLinus Torvalds { 83553d2f744STakashi Iwai struct snd_timer *timer = device->device_data; 8361da177e4SLinus Torvalds return snd_timer_free(timer); 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds 83953d2f744STakashi Iwai static int snd_timer_dev_register(struct snd_device *dev) 8401da177e4SLinus Torvalds { 84153d2f744STakashi Iwai struct snd_timer *timer = dev->device_data; 84253d2f744STakashi Iwai struct snd_timer *timer1; 8431da177e4SLinus Torvalds 8447eaa943cSTakashi Iwai if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 8457eaa943cSTakashi Iwai return -ENXIO; 8461da177e4SLinus Torvalds if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 8471da177e4SLinus Torvalds !timer->hw.resolution && timer->hw.c_resolution == NULL) 8481da177e4SLinus Torvalds return -EINVAL; 8491da177e4SLinus Torvalds 8501a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 8519244b2c3SJohannes Berg list_for_each_entry(timer1, &snd_timer_list, device_list) { 8521da177e4SLinus Torvalds if (timer1->tmr_class > timer->tmr_class) 8531da177e4SLinus Torvalds break; 8541da177e4SLinus Torvalds if (timer1->tmr_class < timer->tmr_class) 8551da177e4SLinus Torvalds continue; 8561da177e4SLinus Torvalds if (timer1->card && timer->card) { 8571da177e4SLinus Torvalds if (timer1->card->number > timer->card->number) 8581da177e4SLinus Torvalds break; 8591da177e4SLinus Torvalds if (timer1->card->number < timer->card->number) 8601da177e4SLinus Torvalds continue; 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds if (timer1->tmr_device > timer->tmr_device) 8631da177e4SLinus Torvalds break; 8641da177e4SLinus Torvalds if (timer1->tmr_device < timer->tmr_device) 8651da177e4SLinus Torvalds continue; 8661da177e4SLinus Torvalds if (timer1->tmr_subdevice > timer->tmr_subdevice) 8671da177e4SLinus Torvalds break; 8681da177e4SLinus Torvalds if (timer1->tmr_subdevice < timer->tmr_subdevice) 8691da177e4SLinus Torvalds continue; 8701da177e4SLinus Torvalds /* conflicts.. */ 8711a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 8721da177e4SLinus Torvalds return -EBUSY; 8731da177e4SLinus Torvalds } 8749244b2c3SJohannes Berg list_add_tail(&timer->device_list, &timer1->device_list); 8751a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 8761da177e4SLinus Torvalds return 0; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 879c461482cSTakashi Iwai static int snd_timer_dev_disconnect(struct snd_device *device) 8801da177e4SLinus Torvalds { 88153d2f744STakashi Iwai struct snd_timer *timer = device->device_data; 882c461482cSTakashi Iwai mutex_lock(®ister_mutex); 883c461482cSTakashi Iwai list_del_init(&timer->device_list); 884c461482cSTakashi Iwai mutex_unlock(®ister_mutex); 885c461482cSTakashi Iwai return 0; 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 88853d2f744STakashi Iwai void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 8891da177e4SLinus Torvalds { 8901da177e4SLinus Torvalds unsigned long flags; 8911da177e4SLinus Torvalds unsigned long resolution = 0; 89253d2f744STakashi Iwai struct snd_timer_instance *ti, *ts; 8931da177e4SLinus Torvalds 8947c22f1aaSTakashi Iwai if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 8957c22f1aaSTakashi Iwai return; 8967eaa943cSTakashi Iwai if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 8977eaa943cSTakashi Iwai event > SNDRV_TIMER_EVENT_MRESUME)) 8987eaa943cSTakashi Iwai return; 8991da177e4SLinus Torvalds spin_lock_irqsave(&timer->lock, flags); 900a501dfa3SJaroslav Kysela if (event == SNDRV_TIMER_EVENT_MSTART || 901a501dfa3SJaroslav Kysela event == SNDRV_TIMER_EVENT_MCONTINUE || 902a501dfa3SJaroslav Kysela event == SNDRV_TIMER_EVENT_MRESUME) { 9031da177e4SLinus Torvalds if (timer->hw.c_resolution) 9041da177e4SLinus Torvalds resolution = timer->hw.c_resolution(timer); 9051da177e4SLinus Torvalds else 9061da177e4SLinus Torvalds resolution = timer->hw.resolution; 9071da177e4SLinus Torvalds } 9089244b2c3SJohannes Berg list_for_each_entry(ti, &timer->active_list_head, active_list) { 9091da177e4SLinus Torvalds if (ti->ccallback) 9101da177e4SLinus Torvalds ti->ccallback(ti, event, tstamp, resolution); 9119244b2c3SJohannes Berg list_for_each_entry(ts, &ti->slave_active_head, active_list) 9121da177e4SLinus Torvalds if (ts->ccallback) 9131da177e4SLinus Torvalds ts->ccallback(ts, event, tstamp, resolution); 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds spin_unlock_irqrestore(&timer->lock, flags); 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds 9181da177e4SLinus Torvalds /* 9191da177e4SLinus Torvalds * exported functions for global timers 9201da177e4SLinus Torvalds */ 92153d2f744STakashi Iwai int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 9221da177e4SLinus Torvalds { 92353d2f744STakashi Iwai struct snd_timer_id tid; 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 9261da177e4SLinus Torvalds tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 9271da177e4SLinus Torvalds tid.card = -1; 9281da177e4SLinus Torvalds tid.device = device; 9291da177e4SLinus Torvalds tid.subdevice = 0; 9301da177e4SLinus Torvalds return snd_timer_new(NULL, id, &tid, rtimer); 9311da177e4SLinus Torvalds } 9321da177e4SLinus Torvalds 93353d2f744STakashi Iwai int snd_timer_global_free(struct snd_timer *timer) 9341da177e4SLinus Torvalds { 9351da177e4SLinus Torvalds return snd_timer_free(timer); 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 93853d2f744STakashi Iwai int snd_timer_global_register(struct snd_timer *timer) 9391da177e4SLinus Torvalds { 94053d2f744STakashi Iwai struct snd_device dev; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds memset(&dev, 0, sizeof(dev)); 9431da177e4SLinus Torvalds dev.device_data = timer; 9441da177e4SLinus Torvalds return snd_timer_dev_register(&dev); 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds /* 9481da177e4SLinus Torvalds * System timer 9491da177e4SLinus Torvalds */ 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds struct snd_timer_system_private { 9521da177e4SLinus Torvalds struct timer_list tlist; 9531da177e4SLinus Torvalds unsigned long last_expires; 9541da177e4SLinus Torvalds unsigned long last_jiffies; 9551da177e4SLinus Torvalds unsigned long correction; 9561da177e4SLinus Torvalds }; 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds static void snd_timer_s_function(unsigned long data) 9591da177e4SLinus Torvalds { 96053d2f744STakashi Iwai struct snd_timer *timer = (struct snd_timer *)data; 9611da177e4SLinus Torvalds struct snd_timer_system_private *priv = timer->private_data; 9621da177e4SLinus Torvalds unsigned long jiff = jiffies; 9631da177e4SLinus Torvalds if (time_after(jiff, priv->last_expires)) 9646ed5eff0SClemens Ladisch priv->correction += (long)jiff - (long)priv->last_expires; 9651da177e4SLinus Torvalds snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 96853d2f744STakashi Iwai static int snd_timer_s_start(struct snd_timer * timer) 9691da177e4SLinus Torvalds { 9701da177e4SLinus Torvalds struct snd_timer_system_private *priv; 9711da177e4SLinus Torvalds unsigned long njiff; 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds priv = (struct snd_timer_system_private *) timer->private_data; 9741da177e4SLinus Torvalds njiff = (priv->last_jiffies = jiffies); 9751da177e4SLinus Torvalds if (priv->correction > timer->sticks - 1) { 9761da177e4SLinus Torvalds priv->correction -= timer->sticks - 1; 9771da177e4SLinus Torvalds njiff++; 9781da177e4SLinus Torvalds } else { 9791da177e4SLinus Torvalds njiff += timer->sticks - priv->correction; 98017f48ec3SClemens Ladisch priv->correction = 0; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds priv->last_expires = priv->tlist.expires = njiff; 9831da177e4SLinus Torvalds add_timer(&priv->tlist); 9841da177e4SLinus Torvalds return 0; 9851da177e4SLinus Torvalds } 9861da177e4SLinus Torvalds 98753d2f744STakashi Iwai static int snd_timer_s_stop(struct snd_timer * timer) 9881da177e4SLinus Torvalds { 9891da177e4SLinus Torvalds struct snd_timer_system_private *priv; 9901da177e4SLinus Torvalds unsigned long jiff; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds priv = (struct snd_timer_system_private *) timer->private_data; 9931da177e4SLinus Torvalds del_timer(&priv->tlist); 9941da177e4SLinus Torvalds jiff = jiffies; 9951da177e4SLinus Torvalds if (time_before(jiff, priv->last_expires)) 9961da177e4SLinus Torvalds timer->sticks = priv->last_expires - jiff; 9971da177e4SLinus Torvalds else 9981da177e4SLinus Torvalds timer->sticks = 1; 999de2696d8SClemens Ladisch priv->correction = 0; 10001da177e4SLinus Torvalds return 0; 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds 100353d2f744STakashi Iwai static struct snd_timer_hardware snd_timer_system = 10041da177e4SLinus Torvalds { 10051da177e4SLinus Torvalds .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 10061da177e4SLinus Torvalds .resolution = 1000000000L / HZ, 10071da177e4SLinus Torvalds .ticks = 10000000L, 10081da177e4SLinus Torvalds .start = snd_timer_s_start, 10091da177e4SLinus Torvalds .stop = snd_timer_s_stop 10101da177e4SLinus Torvalds }; 10111da177e4SLinus Torvalds 101253d2f744STakashi Iwai static void snd_timer_free_system(struct snd_timer *timer) 10131da177e4SLinus Torvalds { 10141da177e4SLinus Torvalds kfree(timer->private_data); 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds static int snd_timer_register_system(void) 10181da177e4SLinus Torvalds { 101953d2f744STakashi Iwai struct snd_timer *timer; 10201da177e4SLinus Torvalds struct snd_timer_system_private *priv; 10211da177e4SLinus Torvalds int err; 10221da177e4SLinus Torvalds 10236b172a85SClemens Ladisch err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 10246b172a85SClemens Ladisch if (err < 0) 10251da177e4SLinus Torvalds return err; 10261da177e4SLinus Torvalds strcpy(timer->name, "system timer"); 10271da177e4SLinus Torvalds timer->hw = snd_timer_system; 1028ca2c0966STakashi Iwai priv = kzalloc(sizeof(*priv), GFP_KERNEL); 10291da177e4SLinus Torvalds if (priv == NULL) { 10301da177e4SLinus Torvalds snd_timer_free(timer); 10311da177e4SLinus Torvalds return -ENOMEM; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds init_timer(&priv->tlist); 10341da177e4SLinus Torvalds priv->tlist.function = snd_timer_s_function; 10351da177e4SLinus Torvalds priv->tlist.data = (unsigned long) timer; 10361da177e4SLinus Torvalds timer->private_data = priv; 10371da177e4SLinus Torvalds timer->private_free = snd_timer_free_system; 10381da177e4SLinus Torvalds return snd_timer_global_register(timer); 10391da177e4SLinus Torvalds } 10401da177e4SLinus Torvalds 1041e28563ccSTakashi Iwai #ifdef CONFIG_PROC_FS 10421da177e4SLinus Torvalds /* 10431da177e4SLinus Torvalds * Info interface 10441da177e4SLinus Torvalds */ 10451da177e4SLinus Torvalds 104653d2f744STakashi Iwai static void snd_timer_proc_read(struct snd_info_entry *entry, 104753d2f744STakashi Iwai struct snd_info_buffer *buffer) 10481da177e4SLinus Torvalds { 104953d2f744STakashi Iwai struct snd_timer *timer; 105053d2f744STakashi Iwai struct snd_timer_instance *ti; 10511da177e4SLinus Torvalds 10521a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 10539244b2c3SJohannes Berg list_for_each_entry(timer, &snd_timer_list, device_list) { 10541da177e4SLinus Torvalds switch (timer->tmr_class) { 10551da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_GLOBAL: 10561da177e4SLinus Torvalds snd_iprintf(buffer, "G%i: ", timer->tmr_device); 10571da177e4SLinus Torvalds break; 10581da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_CARD: 10596b172a85SClemens Ladisch snd_iprintf(buffer, "C%i-%i: ", 10606b172a85SClemens Ladisch timer->card->number, timer->tmr_device); 10611da177e4SLinus Torvalds break; 10621da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_PCM: 10636b172a85SClemens Ladisch snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 10646b172a85SClemens Ladisch timer->tmr_device, timer->tmr_subdevice); 10651da177e4SLinus Torvalds break; 10661da177e4SLinus Torvalds default: 10676b172a85SClemens Ladisch snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 10686b172a85SClemens Ladisch timer->card ? timer->card->number : -1, 10696b172a85SClemens Ladisch timer->tmr_device, timer->tmr_subdevice); 10701da177e4SLinus Torvalds } 10711da177e4SLinus Torvalds snd_iprintf(buffer, "%s :", timer->name); 10721da177e4SLinus Torvalds if (timer->hw.resolution) 10736b172a85SClemens Ladisch snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 10746b172a85SClemens Ladisch timer->hw.resolution / 1000, 10756b172a85SClemens Ladisch timer->hw.resolution % 1000, 10766b172a85SClemens Ladisch timer->hw.ticks); 10771da177e4SLinus Torvalds if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 10781da177e4SLinus Torvalds snd_iprintf(buffer, " SLAVE"); 10791da177e4SLinus Torvalds snd_iprintf(buffer, "\n"); 10809244b2c3SJohannes Berg list_for_each_entry(ti, &timer->open_list_head, open_list) 10816b172a85SClemens Ladisch snd_iprintf(buffer, " Client %s : %s\n", 10821da177e4SLinus Torvalds ti->owner ? ti->owner : "unknown", 10836b172a85SClemens Ladisch ti->flags & (SNDRV_TIMER_IFLG_START | 10846b172a85SClemens Ladisch SNDRV_TIMER_IFLG_RUNNING) 10856b172a85SClemens Ladisch ? "running" : "stopped"); 10861da177e4SLinus Torvalds } 10871a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds 10906581f4e7STakashi Iwai static struct snd_info_entry *snd_timer_proc_entry; 1091e28563ccSTakashi Iwai 1092e28563ccSTakashi Iwai static void __init snd_timer_proc_init(void) 1093e28563ccSTakashi Iwai { 1094e28563ccSTakashi Iwai struct snd_info_entry *entry; 1095e28563ccSTakashi Iwai 1096e28563ccSTakashi Iwai entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1097e28563ccSTakashi Iwai if (entry != NULL) { 1098e28563ccSTakashi Iwai entry->c.text.read = snd_timer_proc_read; 1099e28563ccSTakashi Iwai if (snd_info_register(entry) < 0) { 1100e28563ccSTakashi Iwai snd_info_free_entry(entry); 1101e28563ccSTakashi Iwai entry = NULL; 1102e28563ccSTakashi Iwai } 1103e28563ccSTakashi Iwai } 1104e28563ccSTakashi Iwai snd_timer_proc_entry = entry; 1105e28563ccSTakashi Iwai } 1106e28563ccSTakashi Iwai 1107e28563ccSTakashi Iwai static void __exit snd_timer_proc_done(void) 1108e28563ccSTakashi Iwai { 1109746d4a02STakashi Iwai snd_info_free_entry(snd_timer_proc_entry); 1110e28563ccSTakashi Iwai } 1111e28563ccSTakashi Iwai #else /* !CONFIG_PROC_FS */ 1112e28563ccSTakashi Iwai #define snd_timer_proc_init() 1113e28563ccSTakashi Iwai #define snd_timer_proc_done() 1114e28563ccSTakashi Iwai #endif 1115e28563ccSTakashi Iwai 11161da177e4SLinus Torvalds /* 11171da177e4SLinus Torvalds * USER SPACE interface 11181da177e4SLinus Torvalds */ 11191da177e4SLinus Torvalds 112053d2f744STakashi Iwai static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 11211da177e4SLinus Torvalds unsigned long resolution, 11221da177e4SLinus Torvalds unsigned long ticks) 11231da177e4SLinus Torvalds { 112453d2f744STakashi Iwai struct snd_timer_user *tu = timeri->callback_data; 112553d2f744STakashi Iwai struct snd_timer_read *r; 11261da177e4SLinus Torvalds int prev; 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds spin_lock(&tu->qlock); 11291da177e4SLinus Torvalds if (tu->qused > 0) { 11301da177e4SLinus Torvalds prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 11311da177e4SLinus Torvalds r = &tu->queue[prev]; 11321da177e4SLinus Torvalds if (r->resolution == resolution) { 11331da177e4SLinus Torvalds r->ticks += ticks; 11341da177e4SLinus Torvalds goto __wake; 11351da177e4SLinus Torvalds } 11361da177e4SLinus Torvalds } 11371da177e4SLinus Torvalds if (tu->qused >= tu->queue_size) { 11381da177e4SLinus Torvalds tu->overrun++; 11391da177e4SLinus Torvalds } else { 11401da177e4SLinus Torvalds r = &tu->queue[tu->qtail++]; 11411da177e4SLinus Torvalds tu->qtail %= tu->queue_size; 11421da177e4SLinus Torvalds r->resolution = resolution; 11431da177e4SLinus Torvalds r->ticks = ticks; 11441da177e4SLinus Torvalds tu->qused++; 11451da177e4SLinus Torvalds } 11461da177e4SLinus Torvalds __wake: 11471da177e4SLinus Torvalds spin_unlock(&tu->qlock); 11481da177e4SLinus Torvalds kill_fasync(&tu->fasync, SIGIO, POLL_IN); 11491da177e4SLinus Torvalds wake_up(&tu->qchange_sleep); 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds 115253d2f744STakashi Iwai static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 115353d2f744STakashi Iwai struct snd_timer_tread *tread) 11541da177e4SLinus Torvalds { 11551da177e4SLinus Torvalds if (tu->qused >= tu->queue_size) { 11561da177e4SLinus Torvalds tu->overrun++; 11571da177e4SLinus Torvalds } else { 11581da177e4SLinus Torvalds memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 11591da177e4SLinus Torvalds tu->qtail %= tu->queue_size; 11601da177e4SLinus Torvalds tu->qused++; 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds 116453d2f744STakashi Iwai static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 116553d2f744STakashi Iwai int event, 11661da177e4SLinus Torvalds struct timespec *tstamp, 11671da177e4SLinus Torvalds unsigned long resolution) 11681da177e4SLinus Torvalds { 116953d2f744STakashi Iwai struct snd_timer_user *tu = timeri->callback_data; 117053d2f744STakashi Iwai struct snd_timer_tread r1; 1171bfe70783SDan Carpenter unsigned long flags; 11721da177e4SLinus Torvalds 11736b172a85SClemens Ladisch if (event >= SNDRV_TIMER_EVENT_START && 11746b172a85SClemens Ladisch event <= SNDRV_TIMER_EVENT_PAUSE) 11751da177e4SLinus Torvalds tu->tstamp = *tstamp; 11761da177e4SLinus Torvalds if ((tu->filter & (1 << event)) == 0 || !tu->tread) 11771da177e4SLinus Torvalds return; 11781da177e4SLinus Torvalds r1.event = event; 11791da177e4SLinus Torvalds r1.tstamp = *tstamp; 11801da177e4SLinus Torvalds r1.val = resolution; 1181bfe70783SDan Carpenter spin_lock_irqsave(&tu->qlock, flags); 11821da177e4SLinus Torvalds snd_timer_user_append_to_tqueue(tu, &r1); 1183bfe70783SDan Carpenter spin_unlock_irqrestore(&tu->qlock, flags); 11841da177e4SLinus Torvalds kill_fasync(&tu->fasync, SIGIO, POLL_IN); 11851da177e4SLinus Torvalds wake_up(&tu->qchange_sleep); 11861da177e4SLinus Torvalds } 11871da177e4SLinus Torvalds 118853d2f744STakashi Iwai static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 11891da177e4SLinus Torvalds unsigned long resolution, 11901da177e4SLinus Torvalds unsigned long ticks) 11911da177e4SLinus Torvalds { 119253d2f744STakashi Iwai struct snd_timer_user *tu = timeri->callback_data; 119353d2f744STakashi Iwai struct snd_timer_tread *r, r1; 11941da177e4SLinus Torvalds struct timespec tstamp; 11951da177e4SLinus Torvalds int prev, append = 0; 11961da177e4SLinus Torvalds 119707799e75STakashi Iwai memset(&tstamp, 0, sizeof(tstamp)); 11981da177e4SLinus Torvalds spin_lock(&tu->qlock); 11996b172a85SClemens Ladisch if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 12006b172a85SClemens Ladisch (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 12011da177e4SLinus Torvalds spin_unlock(&tu->qlock); 12021da177e4SLinus Torvalds return; 12031da177e4SLinus Torvalds } 1204b751eef1SJaroslav Kysela if (tu->last_resolution != resolution || ticks > 0) { 1205b751eef1SJaroslav Kysela if (timer_tstamp_monotonic) 120626204e04SThomas Gleixner ktime_get_ts(&tstamp); 1207b751eef1SJaroslav Kysela else 120807799e75STakashi Iwai getnstimeofday(&tstamp); 1209b751eef1SJaroslav Kysela } 12106b172a85SClemens Ladisch if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 12116b172a85SClemens Ladisch tu->last_resolution != resolution) { 12121da177e4SLinus Torvalds r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 12131da177e4SLinus Torvalds r1.tstamp = tstamp; 12141da177e4SLinus Torvalds r1.val = resolution; 12151da177e4SLinus Torvalds snd_timer_user_append_to_tqueue(tu, &r1); 12161da177e4SLinus Torvalds tu->last_resolution = resolution; 12171da177e4SLinus Torvalds append++; 12181da177e4SLinus Torvalds } 12191da177e4SLinus Torvalds if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 12201da177e4SLinus Torvalds goto __wake; 12211da177e4SLinus Torvalds if (ticks == 0) 12221da177e4SLinus Torvalds goto __wake; 12231da177e4SLinus Torvalds if (tu->qused > 0) { 12241da177e4SLinus Torvalds prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 12251da177e4SLinus Torvalds r = &tu->tqueue[prev]; 12261da177e4SLinus Torvalds if (r->event == SNDRV_TIMER_EVENT_TICK) { 12271da177e4SLinus Torvalds r->tstamp = tstamp; 12281da177e4SLinus Torvalds r->val += ticks; 12291da177e4SLinus Torvalds append++; 12301da177e4SLinus Torvalds goto __wake; 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds r1.event = SNDRV_TIMER_EVENT_TICK; 12341da177e4SLinus Torvalds r1.tstamp = tstamp; 12351da177e4SLinus Torvalds r1.val = ticks; 12361da177e4SLinus Torvalds snd_timer_user_append_to_tqueue(tu, &r1); 12371da177e4SLinus Torvalds append++; 12381da177e4SLinus Torvalds __wake: 12391da177e4SLinus Torvalds spin_unlock(&tu->qlock); 12401da177e4SLinus Torvalds if (append == 0) 12411da177e4SLinus Torvalds return; 12421da177e4SLinus Torvalds kill_fasync(&tu->fasync, SIGIO, POLL_IN); 12431da177e4SLinus Torvalds wake_up(&tu->qchange_sleep); 12441da177e4SLinus Torvalds } 12451da177e4SLinus Torvalds 12461da177e4SLinus Torvalds static int snd_timer_user_open(struct inode *inode, struct file *file) 12471da177e4SLinus Torvalds { 124853d2f744STakashi Iwai struct snd_timer_user *tu; 124902f4865fSTakashi Iwai int err; 125002f4865fSTakashi Iwai 125102f4865fSTakashi Iwai err = nonseekable_open(inode, file); 125202f4865fSTakashi Iwai if (err < 0) 125302f4865fSTakashi Iwai return err; 12541da177e4SLinus Torvalds 1255ca2c0966STakashi Iwai tu = kzalloc(sizeof(*tu), GFP_KERNEL); 12561da177e4SLinus Torvalds if (tu == NULL) 12571da177e4SLinus Torvalds return -ENOMEM; 12581da177e4SLinus Torvalds spin_lock_init(&tu->qlock); 12591da177e4SLinus Torvalds init_waitqueue_head(&tu->qchange_sleep); 12601a60d4c5SIngo Molnar mutex_init(&tu->tread_sem); 12611da177e4SLinus Torvalds tu->ticks = 1; 12621da177e4SLinus Torvalds tu->queue_size = 128; 126353d2f744STakashi Iwai tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 12646b172a85SClemens Ladisch GFP_KERNEL); 12651da177e4SLinus Torvalds if (tu->queue == NULL) { 12661da177e4SLinus Torvalds kfree(tu); 12671da177e4SLinus Torvalds return -ENOMEM; 12681da177e4SLinus Torvalds } 12691da177e4SLinus Torvalds file->private_data = tu; 12701da177e4SLinus Torvalds return 0; 12711da177e4SLinus Torvalds } 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds static int snd_timer_user_release(struct inode *inode, struct file *file) 12741da177e4SLinus Torvalds { 127553d2f744STakashi Iwai struct snd_timer_user *tu; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds if (file->private_data) { 12781da177e4SLinus Torvalds tu = file->private_data; 12791da177e4SLinus Torvalds file->private_data = NULL; 12801da177e4SLinus Torvalds if (tu->timeri) 12811da177e4SLinus Torvalds snd_timer_close(tu->timeri); 12821da177e4SLinus Torvalds kfree(tu->queue); 12831da177e4SLinus Torvalds kfree(tu->tqueue); 12841da177e4SLinus Torvalds kfree(tu); 12851da177e4SLinus Torvalds } 12861da177e4SLinus Torvalds return 0; 12871da177e4SLinus Torvalds } 12881da177e4SLinus Torvalds 128953d2f744STakashi Iwai static void snd_timer_user_zero_id(struct snd_timer_id *id) 12901da177e4SLinus Torvalds { 12911da177e4SLinus Torvalds id->dev_class = SNDRV_TIMER_CLASS_NONE; 12921da177e4SLinus Torvalds id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 12931da177e4SLinus Torvalds id->card = -1; 12941da177e4SLinus Torvalds id->device = -1; 12951da177e4SLinus Torvalds id->subdevice = -1; 12961da177e4SLinus Torvalds } 12971da177e4SLinus Torvalds 129853d2f744STakashi Iwai static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 12991da177e4SLinus Torvalds { 13001da177e4SLinus Torvalds id->dev_class = timer->tmr_class; 13011da177e4SLinus Torvalds id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 13021da177e4SLinus Torvalds id->card = timer->card ? timer->card->number : -1; 13031da177e4SLinus Torvalds id->device = timer->tmr_device; 13041da177e4SLinus Torvalds id->subdevice = timer->tmr_subdevice; 13051da177e4SLinus Torvalds } 13061da177e4SLinus Torvalds 130753d2f744STakashi Iwai static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 13081da177e4SLinus Torvalds { 130953d2f744STakashi Iwai struct snd_timer_id id; 131053d2f744STakashi Iwai struct snd_timer *timer; 13111da177e4SLinus Torvalds struct list_head *p; 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds if (copy_from_user(&id, _tid, sizeof(id))) 13141da177e4SLinus Torvalds return -EFAULT; 13151a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 13161da177e4SLinus Torvalds if (id.dev_class < 0) { /* first item */ 13171da177e4SLinus Torvalds if (list_empty(&snd_timer_list)) 13181da177e4SLinus Torvalds snd_timer_user_zero_id(&id); 13191da177e4SLinus Torvalds else { 13209dfba380SClemens Ladisch timer = list_entry(snd_timer_list.next, 132153d2f744STakashi Iwai struct snd_timer, device_list); 13221da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13231da177e4SLinus Torvalds } 13241da177e4SLinus Torvalds } else { 13251da177e4SLinus Torvalds switch (id.dev_class) { 13261da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_GLOBAL: 13271da177e4SLinus Torvalds id.device = id.device < 0 ? 0 : id.device + 1; 13281da177e4SLinus Torvalds list_for_each(p, &snd_timer_list) { 132953d2f744STakashi Iwai timer = list_entry(p, struct snd_timer, device_list); 13301da177e4SLinus Torvalds if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 13311da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13321da177e4SLinus Torvalds break; 13331da177e4SLinus Torvalds } 13341da177e4SLinus Torvalds if (timer->tmr_device >= id.device) { 13351da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13361da177e4SLinus Torvalds break; 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds } 13391da177e4SLinus Torvalds if (p == &snd_timer_list) 13401da177e4SLinus Torvalds snd_timer_user_zero_id(&id); 13411da177e4SLinus Torvalds break; 13421da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_CARD: 13431da177e4SLinus Torvalds case SNDRV_TIMER_CLASS_PCM: 13441da177e4SLinus Torvalds if (id.card < 0) { 13451da177e4SLinus Torvalds id.card = 0; 13461da177e4SLinus Torvalds } else { 13471da177e4SLinus Torvalds if (id.card < 0) { 13481da177e4SLinus Torvalds id.card = 0; 13491da177e4SLinus Torvalds } else { 13501da177e4SLinus Torvalds if (id.device < 0) { 13511da177e4SLinus Torvalds id.device = 0; 13521da177e4SLinus Torvalds } else { 13536b172a85SClemens Ladisch if (id.subdevice < 0) { 13546b172a85SClemens Ladisch id.subdevice = 0; 13556b172a85SClemens Ladisch } else { 13566b172a85SClemens Ladisch id.subdevice++; 13576b172a85SClemens Ladisch } 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds } 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds list_for_each(p, &snd_timer_list) { 136253d2f744STakashi Iwai timer = list_entry(p, struct snd_timer, device_list); 13631da177e4SLinus Torvalds if (timer->tmr_class > id.dev_class) { 13641da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13651da177e4SLinus Torvalds break; 13661da177e4SLinus Torvalds } 13671da177e4SLinus Torvalds if (timer->tmr_class < id.dev_class) 13681da177e4SLinus Torvalds continue; 13691da177e4SLinus Torvalds if (timer->card->number > id.card) { 13701da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13711da177e4SLinus Torvalds break; 13721da177e4SLinus Torvalds } 13731da177e4SLinus Torvalds if (timer->card->number < id.card) 13741da177e4SLinus Torvalds continue; 13751da177e4SLinus Torvalds if (timer->tmr_device > id.device) { 13761da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13771da177e4SLinus Torvalds break; 13781da177e4SLinus Torvalds } 13791da177e4SLinus Torvalds if (timer->tmr_device < id.device) 13801da177e4SLinus Torvalds continue; 13811da177e4SLinus Torvalds if (timer->tmr_subdevice > id.subdevice) { 13821da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13831da177e4SLinus Torvalds break; 13841da177e4SLinus Torvalds } 13851da177e4SLinus Torvalds if (timer->tmr_subdevice < id.subdevice) 13861da177e4SLinus Torvalds continue; 13871da177e4SLinus Torvalds snd_timer_user_copy_id(&id, timer); 13881da177e4SLinus Torvalds break; 13891da177e4SLinus Torvalds } 13901da177e4SLinus Torvalds if (p == &snd_timer_list) 13911da177e4SLinus Torvalds snd_timer_user_zero_id(&id); 13921da177e4SLinus Torvalds break; 13931da177e4SLinus Torvalds default: 13941da177e4SLinus Torvalds snd_timer_user_zero_id(&id); 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds } 13971a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 13981da177e4SLinus Torvalds if (copy_to_user(_tid, &id, sizeof(*_tid))) 13991da177e4SLinus Torvalds return -EFAULT; 14001da177e4SLinus Torvalds return 0; 14011da177e4SLinus Torvalds } 14021da177e4SLinus Torvalds 14036b172a85SClemens Ladisch static int snd_timer_user_ginfo(struct file *file, 140453d2f744STakashi Iwai struct snd_timer_ginfo __user *_ginfo) 14051da177e4SLinus Torvalds { 140653d2f744STakashi Iwai struct snd_timer_ginfo *ginfo; 140753d2f744STakashi Iwai struct snd_timer_id tid; 140853d2f744STakashi Iwai struct snd_timer *t; 14091da177e4SLinus Torvalds struct list_head *p; 14101da177e4SLinus Torvalds int err = 0; 14111da177e4SLinus Torvalds 1412ef44a1ecSLi Zefan ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1413ef44a1ecSLi Zefan if (IS_ERR(ginfo)) 1414ef44a1ecSLi Zefan return PTR_ERR(ginfo); 1415ef44a1ecSLi Zefan 14161da177e4SLinus Torvalds tid = ginfo->tid; 14171da177e4SLinus Torvalds memset(ginfo, 0, sizeof(*ginfo)); 14181da177e4SLinus Torvalds ginfo->tid = tid; 14191a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 14201da177e4SLinus Torvalds t = snd_timer_find(&tid); 14211da177e4SLinus Torvalds if (t != NULL) { 14221da177e4SLinus Torvalds ginfo->card = t->card ? t->card->number : -1; 14231da177e4SLinus Torvalds if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 14241da177e4SLinus Torvalds ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 14251da177e4SLinus Torvalds strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 14261da177e4SLinus Torvalds strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 14271da177e4SLinus Torvalds ginfo->resolution = t->hw.resolution; 14281da177e4SLinus Torvalds if (t->hw.resolution_min > 0) { 14291da177e4SLinus Torvalds ginfo->resolution_min = t->hw.resolution_min; 14301da177e4SLinus Torvalds ginfo->resolution_max = t->hw.resolution_max; 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds list_for_each(p, &t->open_list_head) { 14331da177e4SLinus Torvalds ginfo->clients++; 14341da177e4SLinus Torvalds } 14351da177e4SLinus Torvalds } else { 14361da177e4SLinus Torvalds err = -ENODEV; 14371da177e4SLinus Torvalds } 14381a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 14391da177e4SLinus Torvalds if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 14401da177e4SLinus Torvalds err = -EFAULT; 14411da177e4SLinus Torvalds kfree(ginfo); 14421da177e4SLinus Torvalds return err; 14431da177e4SLinus Torvalds } 14441da177e4SLinus Torvalds 14456b172a85SClemens Ladisch static int snd_timer_user_gparams(struct file *file, 144653d2f744STakashi Iwai struct snd_timer_gparams __user *_gparams) 14471da177e4SLinus Torvalds { 144853d2f744STakashi Iwai struct snd_timer_gparams gparams; 144953d2f744STakashi Iwai struct snd_timer *t; 14501da177e4SLinus Torvalds int err; 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 14531da177e4SLinus Torvalds return -EFAULT; 14541a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 14551da177e4SLinus Torvalds t = snd_timer_find(&gparams.tid); 14566b172a85SClemens Ladisch if (!t) { 14571da177e4SLinus Torvalds err = -ENODEV; 14586b172a85SClemens Ladisch goto _error; 14591da177e4SLinus Torvalds } 14606b172a85SClemens Ladisch if (!list_empty(&t->open_list_head)) { 14616b172a85SClemens Ladisch err = -EBUSY; 14626b172a85SClemens Ladisch goto _error; 14636b172a85SClemens Ladisch } 14646b172a85SClemens Ladisch if (!t->hw.set_period) { 14656b172a85SClemens Ladisch err = -ENOSYS; 14666b172a85SClemens Ladisch goto _error; 14676b172a85SClemens Ladisch } 14686b172a85SClemens Ladisch err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 14696b172a85SClemens Ladisch _error: 14701a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 14711da177e4SLinus Torvalds return err; 14721da177e4SLinus Torvalds } 14731da177e4SLinus Torvalds 14746b172a85SClemens Ladisch static int snd_timer_user_gstatus(struct file *file, 147553d2f744STakashi Iwai struct snd_timer_gstatus __user *_gstatus) 14761da177e4SLinus Torvalds { 147753d2f744STakashi Iwai struct snd_timer_gstatus gstatus; 147853d2f744STakashi Iwai struct snd_timer_id tid; 147953d2f744STakashi Iwai struct snd_timer *t; 14801da177e4SLinus Torvalds int err = 0; 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 14831da177e4SLinus Torvalds return -EFAULT; 14841da177e4SLinus Torvalds tid = gstatus.tid; 14851da177e4SLinus Torvalds memset(&gstatus, 0, sizeof(gstatus)); 14861da177e4SLinus Torvalds gstatus.tid = tid; 14871a60d4c5SIngo Molnar mutex_lock(®ister_mutex); 14881da177e4SLinus Torvalds t = snd_timer_find(&tid); 14891da177e4SLinus Torvalds if (t != NULL) { 14901da177e4SLinus Torvalds if (t->hw.c_resolution) 14911da177e4SLinus Torvalds gstatus.resolution = t->hw.c_resolution(t); 14921da177e4SLinus Torvalds else 14931da177e4SLinus Torvalds gstatus.resolution = t->hw.resolution; 14941da177e4SLinus Torvalds if (t->hw.precise_resolution) { 14956b172a85SClemens Ladisch t->hw.precise_resolution(t, &gstatus.resolution_num, 14966b172a85SClemens Ladisch &gstatus.resolution_den); 14971da177e4SLinus Torvalds } else { 14981da177e4SLinus Torvalds gstatus.resolution_num = gstatus.resolution; 14991da177e4SLinus Torvalds gstatus.resolution_den = 1000000000uL; 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds } else { 15021da177e4SLinus Torvalds err = -ENODEV; 15031da177e4SLinus Torvalds } 15041a60d4c5SIngo Molnar mutex_unlock(®ister_mutex); 15051da177e4SLinus Torvalds if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 15061da177e4SLinus Torvalds err = -EFAULT; 15071da177e4SLinus Torvalds return err; 15081da177e4SLinus Torvalds } 15091da177e4SLinus Torvalds 15106b172a85SClemens Ladisch static int snd_timer_user_tselect(struct file *file, 151153d2f744STakashi Iwai struct snd_timer_select __user *_tselect) 15121da177e4SLinus Torvalds { 151353d2f744STakashi Iwai struct snd_timer_user *tu; 151453d2f744STakashi Iwai struct snd_timer_select tselect; 15151da177e4SLinus Torvalds char str[32]; 1516c1935b4dSJaroslav Kysela int err = 0; 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds tu = file->private_data; 15191a60d4c5SIngo Molnar mutex_lock(&tu->tread_sem); 1520c1935b4dSJaroslav Kysela if (tu->timeri) { 15211da177e4SLinus Torvalds snd_timer_close(tu->timeri); 1522c1935b4dSJaroslav Kysela tu->timeri = NULL; 1523c1935b4dSJaroslav Kysela } 1524c1935b4dSJaroslav Kysela if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1525c1935b4dSJaroslav Kysela err = -EFAULT; 1526c1935b4dSJaroslav Kysela goto __err; 1527c1935b4dSJaroslav Kysela } 15281da177e4SLinus Torvalds sprintf(str, "application %i", current->pid); 15291da177e4SLinus Torvalds if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 15301da177e4SLinus Torvalds tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 15316b172a85SClemens Ladisch err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 15326b172a85SClemens Ladisch if (err < 0) 1533c1935b4dSJaroslav Kysela goto __err; 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds kfree(tu->queue); 15361da177e4SLinus Torvalds tu->queue = NULL; 15371da177e4SLinus Torvalds kfree(tu->tqueue); 15381da177e4SLinus Torvalds tu->tqueue = NULL; 15391da177e4SLinus Torvalds if (tu->tread) { 154053d2f744STakashi Iwai tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 15416b172a85SClemens Ladisch GFP_KERNEL); 1542c1935b4dSJaroslav Kysela if (tu->tqueue == NULL) 1543c1935b4dSJaroslav Kysela err = -ENOMEM; 15441da177e4SLinus Torvalds } else { 154553d2f744STakashi Iwai tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 15466b172a85SClemens Ladisch GFP_KERNEL); 1547c1935b4dSJaroslav Kysela if (tu->queue == NULL) 1548c1935b4dSJaroslav Kysela err = -ENOMEM; 15491da177e4SLinus Torvalds } 15501da177e4SLinus Torvalds 1551c1935b4dSJaroslav Kysela if (err < 0) { 1552c1935b4dSJaroslav Kysela snd_timer_close(tu->timeri); 1553c1935b4dSJaroslav Kysela tu->timeri = NULL; 1554c1935b4dSJaroslav Kysela } else { 15551da177e4SLinus Torvalds tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 15566b172a85SClemens Ladisch tu->timeri->callback = tu->tread 15576b172a85SClemens Ladisch ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 15581da177e4SLinus Torvalds tu->timeri->ccallback = snd_timer_user_ccallback; 15591da177e4SLinus Torvalds tu->timeri->callback_data = (void *)tu; 1560c1935b4dSJaroslav Kysela } 1561c1935b4dSJaroslav Kysela 1562c1935b4dSJaroslav Kysela __err: 15631a60d4c5SIngo Molnar mutex_unlock(&tu->tread_sem); 1564c1935b4dSJaroslav Kysela return err; 15651da177e4SLinus Torvalds } 15661da177e4SLinus Torvalds 15676b172a85SClemens Ladisch static int snd_timer_user_info(struct file *file, 156853d2f744STakashi Iwai struct snd_timer_info __user *_info) 15691da177e4SLinus Torvalds { 157053d2f744STakashi Iwai struct snd_timer_user *tu; 157153d2f744STakashi Iwai struct snd_timer_info *info; 157253d2f744STakashi Iwai struct snd_timer *t; 15731da177e4SLinus Torvalds int err = 0; 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds tu = file->private_data; 15767c64ec34SClemens Ladisch if (!tu->timeri) 15777c64ec34SClemens Ladisch return -EBADFD; 15781da177e4SLinus Torvalds t = tu->timeri->timer; 15797c64ec34SClemens Ladisch if (!t) 15807c64ec34SClemens Ladisch return -EBADFD; 15811da177e4SLinus Torvalds 1582ca2c0966STakashi Iwai info = kzalloc(sizeof(*info), GFP_KERNEL); 15831da177e4SLinus Torvalds if (! info) 15841da177e4SLinus Torvalds return -ENOMEM; 15851da177e4SLinus Torvalds info->card = t->card ? t->card->number : -1; 15861da177e4SLinus Torvalds if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 15871da177e4SLinus Torvalds info->flags |= SNDRV_TIMER_FLG_SLAVE; 15881da177e4SLinus Torvalds strlcpy(info->id, t->id, sizeof(info->id)); 15891da177e4SLinus Torvalds strlcpy(info->name, t->name, sizeof(info->name)); 15901da177e4SLinus Torvalds info->resolution = t->hw.resolution; 15911da177e4SLinus Torvalds if (copy_to_user(_info, info, sizeof(*_info))) 15921da177e4SLinus Torvalds err = -EFAULT; 15931da177e4SLinus Torvalds kfree(info); 15941da177e4SLinus Torvalds return err; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15976b172a85SClemens Ladisch static int snd_timer_user_params(struct file *file, 159853d2f744STakashi Iwai struct snd_timer_params __user *_params) 15991da177e4SLinus Torvalds { 160053d2f744STakashi Iwai struct snd_timer_user *tu; 160153d2f744STakashi Iwai struct snd_timer_params params; 160253d2f744STakashi Iwai struct snd_timer *t; 160353d2f744STakashi Iwai struct snd_timer_read *tr; 160453d2f744STakashi Iwai struct snd_timer_tread *ttr; 16051da177e4SLinus Torvalds int err; 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds tu = file->private_data; 16087c64ec34SClemens Ladisch if (!tu->timeri) 16097c64ec34SClemens Ladisch return -EBADFD; 16101da177e4SLinus Torvalds t = tu->timeri->timer; 16117c64ec34SClemens Ladisch if (!t) 16127c64ec34SClemens Ladisch return -EBADFD; 16131da177e4SLinus Torvalds if (copy_from_user(¶ms, _params, sizeof(params))) 16141da177e4SLinus Torvalds return -EFAULT; 16151da177e4SLinus Torvalds if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 16161da177e4SLinus Torvalds err = -EINVAL; 16171da177e4SLinus Torvalds goto _end; 16181da177e4SLinus Torvalds } 16196b172a85SClemens Ladisch if (params.queue_size > 0 && 16206b172a85SClemens Ladisch (params.queue_size < 32 || params.queue_size > 1024)) { 16211da177e4SLinus Torvalds err = -EINVAL; 16221da177e4SLinus Torvalds goto _end; 16231da177e4SLinus Torvalds } 16241da177e4SLinus Torvalds if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 16251da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_TICK)| 16261da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_START)| 16271da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_STOP)| 16281da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_CONTINUE)| 16291da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_PAUSE)| 1630a501dfa3SJaroslav Kysela (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1631a501dfa3SJaroslav Kysela (1<<SNDRV_TIMER_EVENT_RESUME)| 16321da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_MSTART)| 16331da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_MSTOP)| 16341da177e4SLinus Torvalds (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 163565d11d95SJaroslav Kysela (1<<SNDRV_TIMER_EVENT_MPAUSE)| 163665d11d95SJaroslav Kysela (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1637a501dfa3SJaroslav Kysela (1<<SNDRV_TIMER_EVENT_MRESUME))) { 16381da177e4SLinus Torvalds err = -EINVAL; 16391da177e4SLinus Torvalds goto _end; 16401da177e4SLinus Torvalds } 16411da177e4SLinus Torvalds snd_timer_stop(tu->timeri); 16421da177e4SLinus Torvalds spin_lock_irq(&t->lock); 16431da177e4SLinus Torvalds tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 16441da177e4SLinus Torvalds SNDRV_TIMER_IFLG_EXCLUSIVE| 16451da177e4SLinus Torvalds SNDRV_TIMER_IFLG_EARLY_EVENT); 16461da177e4SLinus Torvalds if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 16471da177e4SLinus Torvalds tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 16481da177e4SLinus Torvalds if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 16491da177e4SLinus Torvalds tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 16501da177e4SLinus Torvalds if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 16511da177e4SLinus Torvalds tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 16521da177e4SLinus Torvalds spin_unlock_irq(&t->lock); 16536b172a85SClemens Ladisch if (params.queue_size > 0 && 16546b172a85SClemens Ladisch (unsigned int)tu->queue_size != params.queue_size) { 16551da177e4SLinus Torvalds if (tu->tread) { 16566b172a85SClemens Ladisch ttr = kmalloc(params.queue_size * sizeof(*ttr), 16576b172a85SClemens Ladisch GFP_KERNEL); 16581da177e4SLinus Torvalds if (ttr) { 16591da177e4SLinus Torvalds kfree(tu->tqueue); 16601da177e4SLinus Torvalds tu->queue_size = params.queue_size; 16611da177e4SLinus Torvalds tu->tqueue = ttr; 16621da177e4SLinus Torvalds } 16631da177e4SLinus Torvalds } else { 16646b172a85SClemens Ladisch tr = kmalloc(params.queue_size * sizeof(*tr), 16656b172a85SClemens Ladisch GFP_KERNEL); 16661da177e4SLinus Torvalds if (tr) { 16671da177e4SLinus Torvalds kfree(tu->queue); 16681da177e4SLinus Torvalds tu->queue_size = params.queue_size; 16691da177e4SLinus Torvalds tu->queue = tr; 16701da177e4SLinus Torvalds } 16711da177e4SLinus Torvalds } 16721da177e4SLinus Torvalds } 16731da177e4SLinus Torvalds tu->qhead = tu->qtail = tu->qused = 0; 16741da177e4SLinus Torvalds if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 16751da177e4SLinus Torvalds if (tu->tread) { 167653d2f744STakashi Iwai struct snd_timer_tread tread; 16771da177e4SLinus Torvalds tread.event = SNDRV_TIMER_EVENT_EARLY; 16781da177e4SLinus Torvalds tread.tstamp.tv_sec = 0; 16791da177e4SLinus Torvalds tread.tstamp.tv_nsec = 0; 16801da177e4SLinus Torvalds tread.val = 0; 16811da177e4SLinus Torvalds snd_timer_user_append_to_tqueue(tu, &tread); 16821da177e4SLinus Torvalds } else { 168353d2f744STakashi Iwai struct snd_timer_read *r = &tu->queue[0]; 16841da177e4SLinus Torvalds r->resolution = 0; 16851da177e4SLinus Torvalds r->ticks = 0; 16861da177e4SLinus Torvalds tu->qused++; 16871da177e4SLinus Torvalds tu->qtail++; 16881da177e4SLinus Torvalds } 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds tu->filter = params.filter; 16911da177e4SLinus Torvalds tu->ticks = params.ticks; 16921da177e4SLinus Torvalds err = 0; 16931da177e4SLinus Torvalds _end: 16941da177e4SLinus Torvalds if (copy_to_user(_params, ¶ms, sizeof(params))) 16951da177e4SLinus Torvalds return -EFAULT; 16961da177e4SLinus Torvalds return err; 16971da177e4SLinus Torvalds } 16981da177e4SLinus Torvalds 16996b172a85SClemens Ladisch static int snd_timer_user_status(struct file *file, 170053d2f744STakashi Iwai struct snd_timer_status __user *_status) 17011da177e4SLinus Torvalds { 170253d2f744STakashi Iwai struct snd_timer_user *tu; 170353d2f744STakashi Iwai struct snd_timer_status status; 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds tu = file->private_data; 17067c64ec34SClemens Ladisch if (!tu->timeri) 17077c64ec34SClemens Ladisch return -EBADFD; 17081da177e4SLinus Torvalds memset(&status, 0, sizeof(status)); 17091da177e4SLinus Torvalds status.tstamp = tu->tstamp; 17101da177e4SLinus Torvalds status.resolution = snd_timer_resolution(tu->timeri); 17111da177e4SLinus Torvalds status.lost = tu->timeri->lost; 17121da177e4SLinus Torvalds status.overrun = tu->overrun; 17131da177e4SLinus Torvalds spin_lock_irq(&tu->qlock); 17141da177e4SLinus Torvalds status.queue = tu->qused; 17151da177e4SLinus Torvalds spin_unlock_irq(&tu->qlock); 17161da177e4SLinus Torvalds if (copy_to_user(_status, &status, sizeof(status))) 17171da177e4SLinus Torvalds return -EFAULT; 17181da177e4SLinus Torvalds return 0; 17191da177e4SLinus Torvalds } 17201da177e4SLinus Torvalds 17211da177e4SLinus Torvalds static int snd_timer_user_start(struct file *file) 17221da177e4SLinus Torvalds { 17231da177e4SLinus Torvalds int err; 172453d2f744STakashi Iwai struct snd_timer_user *tu; 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds tu = file->private_data; 17277c64ec34SClemens Ladisch if (!tu->timeri) 17287c64ec34SClemens Ladisch return -EBADFD; 17291da177e4SLinus Torvalds snd_timer_stop(tu->timeri); 17301da177e4SLinus Torvalds tu->timeri->lost = 0; 17311da177e4SLinus Torvalds tu->last_resolution = 0; 17321da177e4SLinus Torvalds return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 17331da177e4SLinus Torvalds } 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds static int snd_timer_user_stop(struct file *file) 17361da177e4SLinus Torvalds { 17371da177e4SLinus Torvalds int err; 173853d2f744STakashi Iwai struct snd_timer_user *tu; 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds tu = file->private_data; 17417c64ec34SClemens Ladisch if (!tu->timeri) 17427c64ec34SClemens Ladisch return -EBADFD; 17431da177e4SLinus Torvalds return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 17441da177e4SLinus Torvalds } 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds static int snd_timer_user_continue(struct file *file) 17471da177e4SLinus Torvalds { 17481da177e4SLinus Torvalds int err; 174953d2f744STakashi Iwai struct snd_timer_user *tu; 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds tu = file->private_data; 17527c64ec34SClemens Ladisch if (!tu->timeri) 17537c64ec34SClemens Ladisch return -EBADFD; 17541da177e4SLinus Torvalds tu->timeri->lost = 0; 17551da177e4SLinus Torvalds return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 17561da177e4SLinus Torvalds } 17571da177e4SLinus Torvalds 175815790a6bSTakashi Iwai static int snd_timer_user_pause(struct file *file) 175915790a6bSTakashi Iwai { 176015790a6bSTakashi Iwai int err; 176153d2f744STakashi Iwai struct snd_timer_user *tu; 176215790a6bSTakashi Iwai 176315790a6bSTakashi Iwai tu = file->private_data; 17647c64ec34SClemens Ladisch if (!tu->timeri) 17657c64ec34SClemens Ladisch return -EBADFD; 1766d138b445SJaroslav Kysela return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 176715790a6bSTakashi Iwai } 176815790a6bSTakashi Iwai 17698c50b37cSTakashi Iwai enum { 17708c50b37cSTakashi Iwai SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 17718c50b37cSTakashi Iwai SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 17728c50b37cSTakashi Iwai SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 17738c50b37cSTakashi Iwai SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 17748c50b37cSTakashi Iwai }; 17758c50b37cSTakashi Iwai 17766b172a85SClemens Ladisch static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 17776b172a85SClemens Ladisch unsigned long arg) 17781da177e4SLinus Torvalds { 177953d2f744STakashi Iwai struct snd_timer_user *tu; 17801da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 17811da177e4SLinus Torvalds int __user *p = argp; 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds tu = file->private_data; 17841da177e4SLinus Torvalds switch (cmd) { 17851da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_PVERSION: 17861da177e4SLinus Torvalds return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 17871da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 17881da177e4SLinus Torvalds return snd_timer_user_next_device(argp); 17891da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_TREAD: 17901da177e4SLinus Torvalds { 17911da177e4SLinus Torvalds int xarg; 17921da177e4SLinus Torvalds 17931a60d4c5SIngo Molnar mutex_lock(&tu->tread_sem); 1794c1935b4dSJaroslav Kysela if (tu->timeri) { /* too late */ 17951a60d4c5SIngo Molnar mutex_unlock(&tu->tread_sem); 17961da177e4SLinus Torvalds return -EBUSY; 1797c1935b4dSJaroslav Kysela } 1798c1935b4dSJaroslav Kysela if (get_user(xarg, p)) { 17991a60d4c5SIngo Molnar mutex_unlock(&tu->tread_sem); 18001da177e4SLinus Torvalds return -EFAULT; 1801c1935b4dSJaroslav Kysela } 18021da177e4SLinus Torvalds tu->tread = xarg ? 1 : 0; 18031a60d4c5SIngo Molnar mutex_unlock(&tu->tread_sem); 18041da177e4SLinus Torvalds return 0; 18051da177e4SLinus Torvalds } 18061da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_GINFO: 18071da177e4SLinus Torvalds return snd_timer_user_ginfo(file, argp); 18081da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_GPARAMS: 18091da177e4SLinus Torvalds return snd_timer_user_gparams(file, argp); 18101da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_GSTATUS: 18111da177e4SLinus Torvalds return snd_timer_user_gstatus(file, argp); 18121da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_SELECT: 18131da177e4SLinus Torvalds return snd_timer_user_tselect(file, argp); 18141da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_INFO: 18151da177e4SLinus Torvalds return snd_timer_user_info(file, argp); 18161da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_PARAMS: 18171da177e4SLinus Torvalds return snd_timer_user_params(file, argp); 18181da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_STATUS: 18191da177e4SLinus Torvalds return snd_timer_user_status(file, argp); 18201da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_START: 18218c50b37cSTakashi Iwai case SNDRV_TIMER_IOCTL_START_OLD: 18221da177e4SLinus Torvalds return snd_timer_user_start(file); 18231da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_STOP: 18248c50b37cSTakashi Iwai case SNDRV_TIMER_IOCTL_STOP_OLD: 18251da177e4SLinus Torvalds return snd_timer_user_stop(file); 18261da177e4SLinus Torvalds case SNDRV_TIMER_IOCTL_CONTINUE: 18278c50b37cSTakashi Iwai case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 18281da177e4SLinus Torvalds return snd_timer_user_continue(file); 182915790a6bSTakashi Iwai case SNDRV_TIMER_IOCTL_PAUSE: 18308c50b37cSTakashi Iwai case SNDRV_TIMER_IOCTL_PAUSE_OLD: 183115790a6bSTakashi Iwai return snd_timer_user_pause(file); 18321da177e4SLinus Torvalds } 18331da177e4SLinus Torvalds return -ENOTTY; 18341da177e4SLinus Torvalds } 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds static int snd_timer_user_fasync(int fd, struct file * file, int on) 18371da177e4SLinus Torvalds { 183853d2f744STakashi Iwai struct snd_timer_user *tu; 18391da177e4SLinus Torvalds 18401da177e4SLinus Torvalds tu = file->private_data; 184160aa4924SJonathan Corbet return fasync_helper(fd, file, on, &tu->fasync); 18421da177e4SLinus Torvalds } 18431da177e4SLinus Torvalds 18446b172a85SClemens Ladisch static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 18456b172a85SClemens Ladisch size_t count, loff_t *offset) 18461da177e4SLinus Torvalds { 184753d2f744STakashi Iwai struct snd_timer_user *tu; 18481da177e4SLinus Torvalds long result = 0, unit; 18491da177e4SLinus Torvalds int err = 0; 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds tu = file->private_data; 185253d2f744STakashi Iwai unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 18531da177e4SLinus Torvalds spin_lock_irq(&tu->qlock); 18541da177e4SLinus Torvalds while ((long)count - result >= unit) { 18551da177e4SLinus Torvalds while (!tu->qused) { 18561da177e4SLinus Torvalds wait_queue_t wait; 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 18591da177e4SLinus Torvalds err = -EAGAIN; 18601da177e4SLinus Torvalds break; 18611da177e4SLinus Torvalds } 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds set_current_state(TASK_INTERRUPTIBLE); 18641da177e4SLinus Torvalds init_waitqueue_entry(&wait, current); 18651da177e4SLinus Torvalds add_wait_queue(&tu->qchange_sleep, &wait); 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds spin_unlock_irq(&tu->qlock); 18681da177e4SLinus Torvalds schedule(); 18691da177e4SLinus Torvalds spin_lock_irq(&tu->qlock); 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds remove_wait_queue(&tu->qchange_sleep, &wait); 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds if (signal_pending(current)) { 18741da177e4SLinus Torvalds err = -ERESTARTSYS; 18751da177e4SLinus Torvalds break; 18761da177e4SLinus Torvalds } 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds spin_unlock_irq(&tu->qlock); 18801da177e4SLinus Torvalds if (err < 0) 18811da177e4SLinus Torvalds goto _error; 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds if (tu->tread) { 18846b172a85SClemens Ladisch if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 188553d2f744STakashi Iwai sizeof(struct snd_timer_tread))) { 18861da177e4SLinus Torvalds err = -EFAULT; 18871da177e4SLinus Torvalds goto _error; 18881da177e4SLinus Torvalds } 18891da177e4SLinus Torvalds } else { 18906b172a85SClemens Ladisch if (copy_to_user(buffer, &tu->queue[tu->qhead++], 189153d2f744STakashi Iwai sizeof(struct snd_timer_read))) { 18921da177e4SLinus Torvalds err = -EFAULT; 18931da177e4SLinus Torvalds goto _error; 18941da177e4SLinus Torvalds } 18951da177e4SLinus Torvalds } 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds tu->qhead %= tu->queue_size; 18981da177e4SLinus Torvalds 18991da177e4SLinus Torvalds result += unit; 19001da177e4SLinus Torvalds buffer += unit; 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds spin_lock_irq(&tu->qlock); 19031da177e4SLinus Torvalds tu->qused--; 19041da177e4SLinus Torvalds } 19051da177e4SLinus Torvalds spin_unlock_irq(&tu->qlock); 19061da177e4SLinus Torvalds _error: 19071da177e4SLinus Torvalds return result > 0 ? result : err; 19081da177e4SLinus Torvalds } 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 19111da177e4SLinus Torvalds { 19121da177e4SLinus Torvalds unsigned int mask; 191353d2f744STakashi Iwai struct snd_timer_user *tu; 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds tu = file->private_data; 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds poll_wait(file, &tu->qchange_sleep, wait); 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds mask = 0; 19201da177e4SLinus Torvalds if (tu->qused) 19211da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds return mask; 19241da177e4SLinus Torvalds } 19251da177e4SLinus Torvalds 19261da177e4SLinus Torvalds #ifdef CONFIG_COMPAT 19271da177e4SLinus Torvalds #include "timer_compat.c" 19281da177e4SLinus Torvalds #else 19291da177e4SLinus Torvalds #define snd_timer_user_ioctl_compat NULL 19301da177e4SLinus Torvalds #endif 19311da177e4SLinus Torvalds 19329c2e08c5SArjan van de Ven static const struct file_operations snd_timer_f_ops = 19331da177e4SLinus Torvalds { 19341da177e4SLinus Torvalds .owner = THIS_MODULE, 19351da177e4SLinus Torvalds .read = snd_timer_user_read, 19361da177e4SLinus Torvalds .open = snd_timer_user_open, 19371da177e4SLinus Torvalds .release = snd_timer_user_release, 193802f4865fSTakashi Iwai .llseek = no_llseek, 19391da177e4SLinus Torvalds .poll = snd_timer_user_poll, 19401da177e4SLinus Torvalds .unlocked_ioctl = snd_timer_user_ioctl, 19411da177e4SLinus Torvalds .compat_ioctl = snd_timer_user_ioctl_compat, 19421da177e4SLinus Torvalds .fasync = snd_timer_user_fasync, 19431da177e4SLinus Torvalds }; 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds /* 19461da177e4SLinus Torvalds * ENTRY functions 19471da177e4SLinus Torvalds */ 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds static int __init alsa_timer_init(void) 19501da177e4SLinus Torvalds { 19511da177e4SLinus Torvalds int err; 19521da177e4SLinus Torvalds 19531da177e4SLinus Torvalds #ifdef SNDRV_OSS_INFO_DEV_TIMERS 19546b172a85SClemens Ladisch snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 19556b172a85SClemens Ladisch "system timer"); 19561da177e4SLinus Torvalds #endif 1957e28563ccSTakashi Iwai 19581da177e4SLinus Torvalds if ((err = snd_timer_register_system()) < 0) 1959cf74dcf3STakashi Iwai pr_err("ALSA: unable to register system timer (%i)\n", err); 1960f87135f5SClemens Ladisch if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1961f87135f5SClemens Ladisch &snd_timer_f_ops, NULL, "timer")) < 0) 1962cf74dcf3STakashi Iwai pr_err("ALSA: unable to register timer device (%i)\n", err); 1963e28563ccSTakashi Iwai snd_timer_proc_init(); 19641da177e4SLinus Torvalds return 0; 19651da177e4SLinus Torvalds } 19661da177e4SLinus Torvalds 19671da177e4SLinus Torvalds static void __exit alsa_timer_exit(void) 19681da177e4SLinus Torvalds { 19691da177e4SLinus Torvalds struct list_head *p, *n; 19701da177e4SLinus Torvalds 19711da177e4SLinus Torvalds snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 19721da177e4SLinus Torvalds /* unregister the system timer */ 19731da177e4SLinus Torvalds list_for_each_safe(p, n, &snd_timer_list) { 197453d2f744STakashi Iwai struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1975c461482cSTakashi Iwai snd_timer_free(timer); 19761da177e4SLinus Torvalds } 1977e28563ccSTakashi Iwai snd_timer_proc_done(); 19781da177e4SLinus Torvalds #ifdef SNDRV_OSS_INFO_DEV_TIMERS 19791da177e4SLinus Torvalds snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 19801da177e4SLinus Torvalds #endif 19811da177e4SLinus Torvalds } 19821da177e4SLinus Torvalds 19831da177e4SLinus Torvalds module_init(alsa_timer_init) 19841da177e4SLinus Torvalds module_exit(alsa_timer_exit) 19851da177e4SLinus Torvalds 19861da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_open); 19871da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_close); 19881da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_resolution); 19891da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_start); 19901da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_stop); 19911da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_continue); 19921da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_pause); 19931da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_new); 19941da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_notify); 19951da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_global_new); 19961da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_global_free); 19971da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_global_register); 19981da177e4SLinus Torvalds EXPORT_SYMBOL(snd_timer_interrupt); 1999