diff options
Diffstat (limited to 'sound/core/timer.c')
| -rw-r--r-- | sound/core/timer.c | 1901 |
1 files changed, 1901 insertions, 0 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c new file mode 100644 index 000000000000..fa762ca439be --- /dev/null +++ b/sound/core/timer.c @@ -0,0 +1,1901 @@ +/* + * Timers abstract layer + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/smp_lock.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/moduleparam.h> +#include <sound/core.h> +#include <sound/timer.h> +#include <sound/control.h> +#include <sound/info.h> +#include <sound/minors.h> +#include <sound/initval.h> +#include <linux/kmod.h> +#ifdef CONFIG_KERNELD +#include <linux/kerneld.h> +#endif + +#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) +#define DEFAULT_TIMER_LIMIT 3 +#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) +#define DEFAULT_TIMER_LIMIT 2 +#else +#define DEFAULT_TIMER_LIMIT 1 +#endif + +static int timer_limit = DEFAULT_TIMER_LIMIT; +MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); +MODULE_DESCRIPTION("ALSA timer interface"); +MODULE_LICENSE("GPL"); +module_param(timer_limit, int, 0444); +MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); + +typedef struct { + snd_timer_instance_t *timeri; + int tread; /* enhanced read with timestamps and events */ + unsigned long ticks; + unsigned long overrun; + int qhead; + int qtail; + int qused; + int queue_size; + snd_timer_read_t *queue; + snd_timer_tread_t *tqueue; + spinlock_t qlock; + unsigned long last_resolution; + unsigned int filter; + struct timespec tstamp; /* trigger tstamp */ + wait_queue_head_t qchange_sleep; + struct fasync_struct *fasync; +} snd_timer_user_t; + +/* list of timers */ +static LIST_HEAD(snd_timer_list); + +/* list of slave instances */ +static LIST_HEAD(snd_timer_slave_list); + +/* lock for slave active lists */ +static DEFINE_SPINLOCK(slave_active_lock); + +static DECLARE_MUTEX(register_mutex); + +static int snd_timer_free(snd_timer_t *timer); +static int snd_timer_dev_free(snd_device_t *device); +static int snd_timer_dev_register(snd_device_t *device); +static int snd_timer_dev_unregister(snd_device_t *device); + +static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left); + +/* + * create a timer instance with the given owner string. + * when timer is not NULL, increments the module counter + */ +static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer) +{ + snd_timer_instance_t *timeri; + timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL); + if (timeri == NULL) + return NULL; + timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL); + if (! timeri->owner) { + kfree(timeri); + return NULL; + } + INIT_LIST_HEAD(&timeri->open_list); + INIT_LIST_HEAD(&timeri->active_list); + INIT_LIST_HEAD(&timeri->ack_list); + INIT_LIST_HEAD(&timeri->slave_list_head); + INIT_LIST_HEAD(&timeri->slave_active_head); + + timeri->timer = timer; + if (timer && timer->card && !try_module_get(timer->card->module)) { + kfree(timeri->owner); + kfree(timeri); + return NULL; + } + + return timeri; +} + +/* + * find a timer instance from the given timer id + */ +static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) +{ + snd_timer_t *timer = NULL; + struct list_head *p; + + list_for_each(p, &snd_timer_list) { + timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + + if (timer->tmr_class != tid->dev_class) + continue; + if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || + timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && + (timer->card == NULL || + timer->card->number != tid->card)) + continue; + if (timer->tmr_device != tid->device) + continue; + if (timer->tmr_subdevice != tid->subdevice) + continue; + return timer; + } + return NULL; +} + +#ifdef CONFIG_KMOD + +static void snd_timer_request(snd_timer_id_t *tid) +{ + if (! current->fs->root) + return; + switch (tid->dev_class) { + case SNDRV_TIMER_CLASS_GLOBAL: + if (tid->device < timer_limit) + request_module("snd-timer-%i", tid->device); + break; + case SNDRV_TIMER_CLASS_CARD: + case SNDRV_TIMER_CLASS_PCM: + if (tid->card < snd_ecards_limit) + request_module("snd-card-%i", tid->card); + break; + default: + break; + } +} + +#endif + +/* + * look for a master instance matching with the slave id of the given slave. + * when found, relink the open_link of the slave. + * + * call this with register_mutex down. + */ +static void snd_timer_check_slave(snd_timer_instance_t *slave) +{ + snd_timer_t *timer; + snd_timer_instance_t *master; + struct list_head *p, *q; + + /* FIXME: it's really dumb to look up all entries.. */ + list_for_each(p, &snd_timer_list) { + timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + list_for_each(q, &timer->open_list_head) { + master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); + if (slave->slave_class == master->slave_class && + slave->slave_id == master->slave_id) { + list_del(&slave->open_list); + list_add_tail(&slave->open_list, &master->slave_list_head); + spin_lock_irq(&slave_active_lock); + slave->master = master; + slave->timer = master->timer; + spin_unlock_irq(&slave_active_lock); + return; + } + } + } +} + +/* + * look for slave instances matching with the slave id of the given master. + * when found, relink the open_link of slaves. + * + * call this with register_mutex down. + */ +static void snd_timer_check_master(snd_timer_instance_t *master) +{ + snd_timer_instance_t *slave; + struct list_head *p, *n; + + /* check all pending slaves */ + list_for_each_safe(p, n, &snd_timer_slave_list) { + slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); + if (slave->slave_class == master->slave_class && + slave->slave_id == master->slave_id) { + list_del(p); + list_add_tail(p, &master->slave_list_head); + spin_lock_irq(&slave_active_lock); + slave->master = master; + slave->timer = master->timer; + if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) + list_add_tail(&slave->active_list, &master->slave_active_head); + spin_unlock_irq(&slave_active_lock); + } + } +} + +/* + * open a timer instance + * when opening a master, the slave id must be here given. + */ +int snd_timer_open(snd_timer_instance_t **ti, + char *owner, snd_timer_id_t *tid, + unsigned int slave_id) +{ + snd_timer_t *timer; + snd_timer_instance_t *timeri = NULL; + + if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { + /* open a slave instance */ + if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || + tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { + snd_printd("invalid slave class %i\n", tid->dev_sclass); + return -EINVAL; + } + down(®ister_mutex); + timeri = snd_timer_instance_new(owner, NULL); + timeri->slave_class = tid->dev_sclass; + timeri->slave_id = tid->device; + timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; + list_add_tail(&timeri->open_list, &snd_timer_slave_list); + snd_timer_check_slave(timeri); + up(®ister_mutex); + *ti = timeri; + return 0; + } + + /* open a master instance */ + down(®ister_mutex); + timer = snd_timer_find(tid); +#ifdef CONFIG_KMOD + if (timer == NULL) { + up(®ister_mutex); + snd_timer_request(tid); + down(®ister_mutex); + timer = snd_timer_find(tid); + } +#endif + if (timer) { + if (!list_empty(&timer->open_list_head)) { + timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list); + if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { + up(®ister_mutex); + return -EBUSY; + } + } + timeri = snd_timer_instance_new(owner, timer); + if (timeri) { + timeri->slave_class = tid->dev_sclass; + timeri->slave_id = slave_id; + if (list_empty(&timer->open_list_head) && timer->hw.open) + timer->hw.open(timer); + list_add_tail(&timeri->open_list, &timer->open_list_head); + snd_timer_check_master(timeri); + } + } else { + up(®ister_mutex); + return -ENODEV; + } + up(®ister_mutex); + *ti = timeri; + return 0; +} + +static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event); + +/* + * close a timer instance + */ +int snd_timer_close(snd_timer_instance_t * timeri) +{ + snd_timer_t *timer = NULL; + struct list_head *p, *n; + snd_timer_instance_t *slave; + + snd_assert(timeri != NULL, return -ENXIO); + + /* force to stop the timer */ + snd_timer_stop(timeri); + + if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { + /* wait, until the active callback is finished */ + spin_lock_irq(&slave_active_lock); + while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { + spin_unlock_irq(&slave_active_lock); + udelay(10); + spin_lock_irq(&slave_active_lock); + } + spin_unlock_irq(&slave_active_lock); + down(®ister_mutex); + list_del(&timeri->open_list); + up(®ister_mutex); + } else { + timer = timeri->timer; + /* wait, until the active callback is finished */ + spin_lock_irq(&timer->lock); + while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { + spin_unlock_irq(&timer->lock); + udelay(10); + spin_lock_irq(&timer->lock); + } + spin_unlock_irq(&timer->lock); + down(®ister_mutex); + list_del(&timeri->open_list); + if (timer && list_empty(&timer->open_list_head) && timer->hw.close) + timer->hw.close(timer); + /* remove slave links */ + list_for_each_safe(p, n, &timeri->slave_list_head) { + slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); + spin_lock_irq(&slave_active_lock); + _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); + list_del(p); + list_add_tail(p, &snd_timer_slave_list); + slave->master = NULL; + slave->timer = NULL; + spin_unlock_irq(&slave_active_lock); + } + up(®ister_mutex); + } + if (timeri->private_free) + timeri->private_free(timeri); + kfree(timeri->owner); + kfree(timeri); + if (timer && timer->card) + module_put(timer->card->module); + return 0; +} + +unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) +{ + snd_timer_t * timer; + + if (timeri == NULL) + return 0; + if ((timer = timeri->timer) != NULL) { + if (timer->hw.c_resolution) + return timer->hw.c_resolution(timer); + return timer->hw.resolution; + } + return 0; +} + +static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event) +{ + snd_timer_t *timer; + unsigned long flags; + unsigned long resolution = 0; + snd_timer_instance_t *ts; + struct list_head *n; + struct timespec tstamp; + + snd_timestamp_now(&tstamp, 1); + snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return); + if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE) + resolution = snd_timer_resolution(ti); + if (ti->ccallback) + ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); + if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) + return; + timer = ti->timer; + if (timer == NULL) + return; + if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) + return; + spin_lock_irqsave(&timer->lock, flags); + list_for_each(n, &ti->slave_active_head) { + ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); + if (ts->ccallback) + ts->ccallback(ti, event + 100, &tstamp, resolution); + } + spin_unlock_irqrestore(&timer->lock, flags); +} + +static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks) +{ + list_del(&timeri->active_list); + list_add_tail(&timeri->active_list, &timer->active_list_head); + if (timer->running) { + if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) + goto __start_now; + timer->flags |= SNDRV_TIMER_FLG_RESCHED; + timeri->flags |= SNDRV_TIMER_IFLG_START; + return 1; /* delayed start */ + } else { + timer->sticks = sticks; + timer->hw.start(timer); + __start_now: + timer->running++; + timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; + return 0; + } +} + +static int snd_timer_start_slave(snd_timer_instance_t *timeri) +{ + unsigned long flags; + + spin_lock_irqsave(&slave_active_lock, flags); + timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; + if (timeri->master) + list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); + spin_unlock_irqrestore(&slave_active_lock, flags); + return 1; /* delayed start */ +} + +/* + * start the timer instance + */ +int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks) +{ + snd_timer_t *timer; + int result = -EINVAL; + unsigned long flags; + + if (timeri == NULL || ticks < 1) + return -EINVAL; + if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { + result = snd_timer_start_slave(timeri); + snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); + return result; + } + timer = timeri->timer; + if (timer == NULL) + return -EINVAL; + spin_lock_irqsave(&timer->lock, flags); + timeri->ticks = timeri->cticks = ticks; + timeri->pticks = 0; + result = snd_timer_start1(timer, timeri, ticks); + spin_unlock_irqrestore(&timer->lock, flags); + snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); + return result; +} + +static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event) +{ + snd_timer_t *timer; + unsigned long flags; + + snd_assert(timeri != NULL, return -ENXIO); + + if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { + if (!keep_flag) { + spin_lock_irqsave(&slave_active_lock, flags); + timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; + spin_unlock_irqrestore(&slave_active_lock, flags); + } + goto __end; + } + timer = timeri->timer; + if (!timer) + return -EINVAL; + spin_lock_irqsave(&timer->lock, flags); + list_del_init(&timeri->ack_list); + list_del_init(&timeri->active_list); + if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && + !(--timer->running)) { + timer->hw.stop(timer); + if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { + timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; + snd_timer_reschedule(timer, 0); + if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { + timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; + timer->hw.start(timer); + } + } + } + if (!keep_flag) + timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START); + spin_unlock_irqrestore(&timer->lock, flags); + __end: + if (event != SNDRV_TIMER_EVENT_RESOLUTION) + snd_timer_notify1(timeri, event); + return 0; +} + +/* + * stop the timer instance. + * + * do not call this from the timer callback! + */ +int snd_timer_stop(snd_timer_instance_t * timeri) +{ + snd_timer_t *timer; + unsigned long flags; + int err; + + err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); + if (err < 0) + return err; + timer = timeri->timer; + spin_lock_irqsave(&timer->lock, flags); + timeri->cticks = timeri->ticks; + timeri->pticks = 0; + spin_unlock_irqrestore(&timer->lock, flags); + return 0; +} + +/* + * start again.. the tick is kept. + */ +int snd_timer_continue(snd_timer_instance_t * timeri) +{ + snd_timer_t *timer; + int result = -EINVAL; + unsigned long flags; + + if (timeri == NULL) + return result; + if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) + return snd_timer_start_slave(timeri); + timer = timeri->timer; + if (! timer) + return -EINVAL; + spin_lock_irqsave(&timer->lock, flags); + if (!timeri->cticks) + timeri->cticks = 1; + timeri->pticks = 0; + result = snd_timer_start1(timer, timeri, timer->sticks); + spin_unlock_irqrestore(&timer->lock, flags); + snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); + return result; +} + +/* + * pause.. remember the ticks left + */ +int snd_timer_pause(snd_timer_instance_t * timeri) +{ + return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); +} + +/* + * reschedule the timer + * + * start pending instances and check the scheduling ticks. + * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. + */ +static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left) +{ + snd_timer_instance_t *ti; + unsigned long ticks = ~0UL; + struct list_head *p; + + list_for_each(p, &timer->active_list_head) { + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); + if (ti->flags & SNDRV_TIMER_IFLG_START) { + ti->flags &= ~SNDRV_TIMER_IFLG_START; + ti->flags |= SNDRV_TIMER_IFLG_RUNNING; + timer->running++; + } + if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { + if (ticks > ti->cticks) + ticks = ti->cticks; + } + } + if (ticks == ~0UL) { + timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; + return; + } + if (ticks > timer->hw.ticks) + ticks = timer->hw.ticks; + if (ticks_left != ticks) + timer->flags |= SNDRV_TIMER_FLG_CHANGE; + timer->sticks = ticks; +} + +/* + * timer tasklet + * + */ +static void snd_timer_tasklet(unsigned long arg) +{ + snd_timer_t *timer = (snd_timer_t *) arg; + snd_timer_instance_t *ti; + struct list_head *p; + unsigned long resolution, ticks; + + spin_lock(&timer->lock); + /* now process all callbacks */ + while (!list_empty(&timer->sack_list_head)) { + p = timer->sack_list_head.next; /* get first item */ + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); + + /* remove from ack_list and make empty */ + list_del_init(p); + + ticks = ti->pticks; + ti->pticks = 0; + resolution = ti->resolution; + + ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; + spin_unlock(&timer->lock); + if (ti->callback) + ti->callback(ti, resolution, ticks); + spin_lock(&timer->lock); + ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; + } + spin_unlock(&timer->lock); +} + +/* + * timer interrupt + * + * ticks_left is usually equal to timer->sticks. + * + */ +void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left) +{ + snd_timer_instance_t *ti, *ts; + unsigned long resolution, ticks; + struct list_head *p, *q, *n; + int use_tasklet = 0; + + if (timer == NULL) + return; + + spin_lock(&timer->lock); + + /* remember the current resolution */ + if (timer->hw.c_resolution) + resolution = timer->hw.c_resolution(timer); + else + resolution = timer->hw.resolution; + + /* loop for all active instances + * here we cannot use list_for_each because the active_list of a processed + * instance is relinked to done_list_head before callback is called. + */ + list_for_each_safe(p, n, &timer->active_list_head) { + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); + if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) + continue; + ti->pticks += ticks_left; + ti->resolution = resolution; + if (ti->cticks < ticks_left) + ti->cticks = 0; + else + ti->cticks -= ticks_left; + if (ti->cticks) /* not expired */ + continue; + if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { + ti->cticks = ti->ticks; + } else { + ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; + if (--timer->running) + list_del(p); + } + if (list_empty(&ti->ack_list)) { + if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || + (ti->flags & SNDRV_TIMER_IFLG_FAST)) { + list_add_tail(&ti->ack_list, &timer->ack_list_head); + } else { + list_add_tail(&ti->ack_list, &timer->sack_list_head); + } + } + list_for_each(q, &ti->slave_active_head) { + ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list); + ts->pticks = ti->pticks; + ts->resolution = resolution; + if (list_empty(&ts->ack_list)) { + if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || + (ti->flags & SNDRV_TIMER_IFLG_FAST)) { + list_add_tail(&ts->ack_list, &timer->ack_list_head); + } else { + list_add_tail(&ts->ack_list, &timer->sack_list_head); + } + } + } + } + if (timer->flags & SNDRV_TIMER_FLG_RESCHED) + snd_timer_reschedule(timer, ticks_left); + if (timer->running) { + if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { + timer->hw.stop(timer); + timer->flags |= SNDRV_TIMER_FLG_CHANGE; + } + if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || + (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { + /* restart timer */ + timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; + timer->hw.start(timer); + } + } else { + timer->hw.stop(timer); + } + + /* now process all fast callbacks */ + while (!list_empty(&timer->ack_list_head)) { + p = timer->ack_list_head.next; /* get first item */ + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); + + /* remove from ack_list and make empty */ + list_del_init(p); + + ticks = ti->pticks; + ti->pticks = 0; + + ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; + spin_unlock(&timer->lock); + if (ti->callback) + ti->callback(ti, resolution, ticks); + spin_lock(&timer->lock); + ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; + } + + /* do we have any slow callbacks? */ + use_tasklet = !list_empty(&timer->sack_list_head); + spin_unlock(&timer->lock); + + if (use_tasklet) + tasklet_hi_schedule(&timer->task_queue); +} + +/* + + */ + +int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer) +{ + snd_timer_t *timer; + int err; + static snd_device_ops_t ops = { + .dev_free = snd_timer_dev_free, + .dev_register = snd_timer_dev_register, + .dev_unregister = snd_timer_dev_unregister + }; + + snd_assert(tid != NULL, return -EINVAL); + snd_assert(rtimer != NULL, return -EINVAL); + *rtimer = NULL; + timer = kcalloc(1, sizeof(*timer), GFP_KERNEL); + if (timer == NULL) + return -ENOMEM; + timer->tmr_class = tid->dev_class; + timer->card = card; + timer->tmr_device = tid->device; + timer->tmr_subdevice = tid->subdevice; + if (id) + strlcpy(timer->id, id, sizeof(timer->id)); + INIT_LIST_HEAD(&timer->device_list); + INIT_LIST_HEAD(&timer->open_list_head); + INIT_LIST_HEAD(&timer->active_list_head); + INIT_LIST_HEAD(&timer->ack_list_head); + INIT_LIST_HEAD(&timer->sack_list_head); + spin_lock_init(&timer->lock); + tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer); + if (card != NULL) { + if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { + snd_timer_free(timer); + return err; + } + } + *rtimer = timer; + return 0; +} + +static int snd_timer_free(snd_timer_t *timer) +{ + snd_assert(timer != NULL, return -ENXIO); + if (timer->private_free) + timer->private_free(timer); + kfree(timer); + return 0; +} + +int snd_timer_dev_free(snd_device_t *device) +{ + snd_timer_t *timer = device->device_data; + return snd_timer_free(timer); +} + +int snd_timer_dev_register(snd_device_t *dev) +{ + snd_timer_t *timer = dev->device_data; + snd_timer_t *timer1; + struct list_head *p; + + snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO); + if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && + !timer->hw.resolution && timer->hw.c_resolution == NULL) + return -EINVAL; + + down(®ister_mutex); + list_for_each(p, &snd_timer_list) { + timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + if (timer1->tmr_class > timer->tmr_class) + break; + if (timer1->tmr_class < timer->tmr_class) + continue; + if (timer1->card && timer->card) { + if (timer1->card->number > timer->card->number) + break; + if (timer1->card->number < timer->card->number) + continue; + } + if (timer1->tmr_device > timer->tmr_device) + break; + if (timer1->tmr_device < timer->tmr_device) + continue; + if (timer1->tmr_subdevice > timer->tmr_subdevice) + break; + if (timer1->tmr_subdevice < timer->tmr_subdevice) + continue; + /* conflicts.. */ + up(®ister_mutex); + return -EBUSY; + } + list_add_tail(&timer->device_list, p); + up(®ister_mutex); + return 0; +} + +int snd_timer_unregister(snd_timer_t *timer) +{ + struct list_head *p, *n; + snd_timer_instance_t *ti; + + snd_assert(timer != NULL, return -ENXIO); + down(®ister_mutex); + if (! list_empty(&timer->open_list_head)) { + snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); + list_for_each_safe(p, n, &timer->open_list_head) { + list_del_init(p); + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); + ti->timer = NULL; + } + } + list_del(&timer->device_list); + up(®ister_mutex); + return snd_timer_free(timer); +} + +static int snd_timer_dev_unregister(snd_device_t *device) +{ + snd_timer_t *timer = device->device_data; + return snd_timer_unregister(timer); +} + +void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp) +{ + unsigned long flags; + unsigned long resolution = 0; + snd_timer_instance_t *ti, *ts; + struct list_head *p, *n; + + snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return); + snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return); + spin_lock_irqsave(&timer->lock, flags); + if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) { + if (timer->hw.c_resolution) + resolution = timer->hw.c_resolution(timer); + else + resolution = timer->hw.resolution; + } + list_for_each(p, &timer->active_list_head) { + ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); + if (ti->ccallback) + ti->ccallback(ti, event, tstamp, resolution); + list_for_each(n, &ti->slave_active_head) { + ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); + if (ts->ccallback) + ts->ccallback(ts, event, tstamp, resolution); + } + } + spin_unlock_irqrestore(&timer->lock, flags); +} + +/* + * exported functions for global timers + */ +int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) +{ + snd_timer_id_t tid; + + tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; + tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; + tid.card = -1; + tid.device = device; + tid.subdevice = 0; + return snd_timer_new(NULL, id, &tid, rtimer); +} + +int snd_timer_global_free(snd_timer_t *timer) +{ + return snd_timer_free(timer); +} + +int snd_timer_global_register(snd_timer_t *timer) +{ + snd_device_t dev; + + memset(&dev, 0, sizeof(dev)); + dev.device_data = timer; + return snd_timer_dev_register(&dev); +} + +int snd_timer_global_unregister(snd_timer_t *timer) +{ + return snd_timer_unregister(timer); +} + +/* + * System timer + */ + +struct snd_timer_system_private { + struct timer_list tlist; + struct timer * timer; + unsigned long last_expires; + unsigned long last_jiffies; + unsigned long correction; +}; + +unsigned int snd_timer_system_resolution(void) +{ + return 1000000000L / HZ; +} + +static void snd_timer_s_function(unsigned long data) +{ + snd_timer_t *timer = (snd_timer_t *)data; + struct snd_timer_system_private *priv = timer->private_data; + unsigned long jiff = jiffies; + if (time_after(jiff, priv->last_expires)) + priv->correction = (long)jiff - (long)priv->last_expires; + snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); +} + +static int snd_timer_s_start(snd_timer_t * timer) +{ + struct snd_timer_system_private *priv; + unsigned long njiff; + + priv = (struct snd_timer_system_private *) timer->private_data; + njiff = (priv->last_jiffies = jiffies); + if (priv->correction > timer->sticks - 1) { + priv->correction -= timer->sticks - 1; + njiff++; + } else { + njiff += timer->sticks - priv->correction; + priv->correction -= timer->sticks; + } + priv->last_expires = priv->tlist.expires = njiff; + add_timer(&priv->tlist); + return 0; +} + +static int snd_timer_s_stop(snd_timer_t * timer) +{ + struct snd_timer_system_private *priv; + unsigned long jiff; + + priv = (struct snd_timer_system_private *) timer->private_data; + del_timer(&priv->tlist); + jiff = jiffies; + if (time_before(jiff, priv->last_expires)) + timer->sticks = priv->last_expires - jiff; + else + timer->sticks = 1; + return 0; +} + +static struct _snd_timer_hardware snd_timer_system = +{ + .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, + .resolution = 1000000000L / HZ, + .ticks = 10000000L, + .start = snd_timer_s_start, + .stop = snd_timer_s_stop +}; + +static void snd_timer_free_system(snd_timer_t *timer) +{ + kfree(timer->private_data); +} + +static int snd_timer_register_system(void) +{ + snd_timer_t *timer; + struct snd_timer_system_private *priv; + int err; + + if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0) + return err; + strcpy(timer->name, "system timer"); + timer->hw = snd_timer_system; + priv = kcalloc(1, sizeof(*priv), GFP_KERNEL); + if (priv == NULL) { + snd_timer_free(timer); + return -ENOMEM; + } + init_timer(&priv->tlist); + priv->tlist.function = snd_timer_s_function; + priv->tlist.data = (unsigned long) timer; + timer->private_data = priv; + timer->private_free = snd_timer_free_system; + return snd_timer_global_register(timer); +} + +/* + * Info interface + */ + +static void snd_timer_proc_read(snd_info_entry_t *entry, + snd_info_buffer_t * buffer) +{ + unsigned long flags; + snd_timer_t *timer; + snd_timer_instance_t *ti; + struct list_head *p, *q; + + down(®ister_mutex); + list_for_each(p, &snd_timer_list) { + timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + switch (timer->tmr_class) { + case SNDRV_TIMER_CLASS_GLOBAL: + snd_iprintf(buffer, "G%i: ", timer->tmr_device); + break; + case SNDRV_TIMER_CLASS_CARD: + snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device); + break; + case SNDRV_TIMER_CLASS_PCM: + snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice); + break; + default: + snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice); + } + snd_iprintf(buffer, "%s :", timer->name); + if (timer->hw.resolution) + snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks); + if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) + snd_iprintf(buffer, " SLAVE"); + snd_iprintf(buffer, "\n"); + spin_lock_irqsave(&timer->lock, flags); + list_for_each(q, &timer->open_list_head) { + ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); + snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n", + ti->owner ? ti->owner : "unknown", + ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped", + ti->lost); + } + spin_unlock_irqrestore(&timer->lock, flags); + } + up(®ister_mutex); +} + +/* + * USER SPACE interface + */ + +static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, + unsigned long resolution, + unsigned long ticks) +{ + snd_timer_user_t *tu = timeri->callback_data; + snd_timer_read_t *r; + int prev; + + spin_lock(&tu->qlock); + if (tu->qused > 0) { + prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; + r = &tu->queue[prev]; + if (r->resolution == resolution) { + r->ticks += ticks; + goto __wake; + } + } + if (tu->qused >= tu->queue_size) { + tu->overrun++; + } else { + r = &tu->queue[tu->qtail++]; + tu->qtail %= tu->queue_size; + r->resolution = resolution; + r->ticks = ticks; + tu->qused++; + } + __wake: + spin_unlock(&tu->qlock); + kill_fasync(&tu->fasync, SIGIO, POLL_IN); + wake_up(&tu->qchange_sleep); +} + +static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread) +{ + if (tu->qused >= tu->queue_size) { + tu->overrun++; + } else { + memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); + tu->qtail %= tu->queue_size; + tu->qused++; + } +} + +static void snd_timer_user_ccallback(snd_timer_instance_t *timeri, + enum sndrv_timer_event event, + struct timespec *tstamp, + unsigned long resolution) +{ + snd_timer_user_t *tu = timeri->callback_data; + snd_timer_tread_t r1; + + if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE) + tu->tstamp = *tstamp; + if ((tu->filter & (1 << event)) == 0 || !tu->tread) + return; + r1.event = event; + r1.tstamp = *tstamp; + r1.val = resolution; + spin_lock(&tu->qlock); + snd_timer_user_append_to_tqueue(tu, &r1); + spin_unlock(&tu->qlock); + kill_fasync(&tu->fasync, SIGIO, POLL_IN); + wake_up(&tu->qchange_sleep); +} + +static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri, + unsigned long resolution, + unsigned long ticks) +{ + snd_timer_user_t *tu = timeri->callback_data; + snd_timer_tread_t *r, r1; + struct timespec tstamp; + int prev, append = 0; + + snd_timestamp_zero(&tstamp); + spin_lock(&tu->qlock); + if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) { + spin_unlock(&tu->qlock); + return; + } + if (tu->last_resolution != resolution || ticks > 0) + snd_timestamp_now(&tstamp, 1); + if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { + r1.event = SNDRV_TIMER_EVENT_RESOLUTION; + r1.tstamp = tstamp; + r1.val = resolution; + snd_timer_user_append_to_tqueue(tu, &r1); + tu->last_resolution = resolution; + append++; + } + if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) + goto __wake; + if (ticks == 0) + goto __wake; + if (tu->qused > 0) { + prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; + r = &tu->tqueue[prev]; + if (r->event == SNDRV_TIMER_EVENT_TICK) { + r->tstamp = tstamp; + r->val += ticks; + append++; + goto __wake; + } + } + r1.event = SNDRV_TIMER_EVENT_TICK; + r1.tstamp = tstamp; + r1.val = ticks; + snd_timer_user_append_to_tqueue(tu, &r1); + append++; + __wake: + spin_unlock(&tu->qlock); + if (append == 0) + return; + kill_fasync(&tu->fasync, SIGIO, POLL_IN); + wake_up(&tu->qchange_sleep); +} + +static int snd_timer_user_open(struct inode *inode, struct file *file) +{ + snd_timer_user_t *tu; + + tu = kcalloc(1, sizeof(*tu), GFP_KERNEL); + if (tu == NULL) + return -ENOMEM; + spin_lock_init(&tu->qlock); + init_waitqueue_head(&tu->qchange_sleep); + tu->ticks = 1; + tu->queue_size = 128; + tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); + if (tu->queue == NULL) { + kfree(tu); + return -ENOMEM; + } + file->private_data = tu; + return 0; +} + +static int snd_timer_user_release(struct inode *inode, struct file *file) +{ + snd_timer_user_t *tu; + + if (file->private_data) { + tu = file->private_data; + file->private_data = NULL; + fasync_helper(-1, file, 0, &tu->fasync); + if (tu->timeri) + snd_timer_close(tu->timeri); + kfree(tu->queue); + kfree(tu->tqueue); + kfree(tu); + } + return 0; +} + +static void snd_timer_user_zero_id(snd_timer_id_t *id) +{ + id->dev_class = SNDRV_TIMER_CLASS_NONE; + id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; + id->card = -1; + id->device = -1; + id->subdevice = -1; +} + +static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) +{ + id->dev_class = timer->tmr_class; + id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; + id->card = timer->card ? timer->card->number : -1; + id->device = timer->tmr_device; + id->subdevice = timer->tmr_subdevice; +} + +static int snd_timer_user_next_device(snd_timer_id_t __user *_tid) +{ + snd_timer_id_t id; + snd_timer_t *timer; + struct list_head *p; + + if (copy_from_user(&id, _tid, sizeof(id))) + return -EFAULT; + down(®ister_mutex); + if (id.dev_class < 0) { /* first item */ + if (list_empty(&snd_timer_list)) + snd_timer_user_zero_id(&id); + else { + timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list); + snd_timer_user_copy_id(&id, timer); + } + } else { + switch (id.dev_class) { + case SNDRV_TIMER_CLASS_GLOBAL: + id.device = id.device < 0 ? 0 : id.device + 1; + list_for_each(p, &snd_timer_list) { + timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { + snd_timer_user_copy_id(&id, timer); + break; + } + if (timer->tmr_device >= id.device) { + snd_timer_user_copy_id(&id, timer); + break; + } + } + if (p == &snd_timer_list) + snd_timer_user_zero_id(&id); + break; + case SNDRV_TIMER_CLASS_CARD: + case SNDRV_TIMER_CLASS_PCM: + if (id.card < 0) { + id.card = 0; + } else { + if (id.card < 0) { + id.card = 0; + } else { + if (id.device < 0) { + id.device = 0; + } else { + id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1; + } + } + } + list_for_each(p, &snd_timer_list) { + timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + if (timer->tmr_class > id.dev_class) { + snd_timer_user_copy_id(&id, timer); + break; + } + if (timer->tmr_class < id.dev_class) + continue; + if (timer->card->number > id.card) { + snd_timer_user_copy_id(&id, timer); + break; + } + if (timer->card->number < id.card) + continue; + if (timer->tmr_device > id.device) { + snd_timer_user_copy_id(&id, timer); + break; + } + if (timer->tmr_device < id.device) + continue; + if (timer->tmr_subdevice > id.subdevice) { + snd_timer_user_copy_id(&id, timer); + break; + } + if (timer->tmr_subdevice < id.subdevice) + continue; + snd_timer_user_copy_id(&id, timer); + break; + } + if (p == &snd_timer_list) + snd_timer_user_zero_id(&id); + break; + default: + snd_timer_user_zero_id(&id); + } + } + up(®ister_mutex); + if (copy_to_user(_tid, &id, sizeof(*_tid))) + return -EFAULT; + return 0; +} + +static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo) +{ + snd_timer_ginfo_t *ginfo; + snd_timer_id_t tid; + snd_timer_t *t; + struct list_head *p; + int err = 0; + + ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); + if (! ginfo) + return -ENOMEM; + if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { + kfree(ginfo); + return -EFAULT; + } + tid = ginfo->tid; + memset(ginfo, 0, sizeof(*ginfo)); + ginfo->tid = tid; + down(®ister_mutex); + t = snd_timer_find(&tid); + if (t != NULL) { + ginfo->card = t->card ? t->card->number : -1; + if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) + ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; + strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); + strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); + ginfo->resolution = t->hw.resolution; + if (t->hw.resolution_min > 0) { + ginfo->resolution_min = t->hw.resolution_min; + ginfo->resolution_max = t->hw.resolution_max; + } + list_for_each(p, &t->open_list_head) { + ginfo->clients++; + } + } else { + err = -ENODEV; + } + up(®ister_mutex); + if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) + err = -EFAULT; + kfree(ginfo); + return err; +} + +static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams) +{ + snd_timer_gparams_t gparams; + snd_timer_t *t; + int err; + + if (copy_from_user(&gparams, _gparams, sizeof(gparams))) + return -EFAULT; + down(®ister_mutex); + t = snd_timer_find(&gparams.tid); + if (t != NULL) { + if (list_empty(&t->open_list_head)) { + if (t->hw.set_period) + err = t->hw.set_period(t, gparams.period_num, gparams.period_den); + else + err = -ENOSYS; + } else { + err = -EBUSY; + } + } else { + err = -ENODEV; + } + up(®ister_mutex); + return err; +} + +static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus) +{ + snd_timer_gstatus_t gstatus; + snd_timer_id_t tid; + snd_timer_t *t; + int err = 0; + + if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) + return -EFAULT; + tid = gstatus.tid; + memset(&gstatus, 0, sizeof(gstatus)); + gstatus.tid = tid; + down(®ister_mutex); + t = snd_timer_find(&tid); + if (t != NULL) { + if (t->hw.c_resolution) + gstatus.resolution = t->hw.c_resolution(t); + else + gstatus.resolution = t->hw.resolution; + if (t->hw.precise_resolution) { + t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den); + } else { + gstatus.resolution_num = gstatus.resolution; + gstatus.resolution_den = 1000000000uL; + } + } else { + err = -ENODEV; + } + up(®ister_mutex); + if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) + err = -EFAULT; + return err; +} + +static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect) +{ + snd_timer_user_t *tu; + snd_timer_select_t tselect; + char str[32]; + int err; + + tu = file->private_data; + if (tu->timeri) + snd_timer_close(tu->timeri); + if (copy_from_user(&tselect, _tselect, sizeof(tselect))) + return -EFAULT; + sprintf(str, "application %i", current->pid); + if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) + tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; + if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0) + return err; + + if (tu->queue) { + kfree(tu->queue); + tu->queue = NULL; + } + if (tu->tqueue) { + kfree(tu->tqueue); + tu->tqueue = NULL; + } + if (tu->tread) { + tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); + if (tu->tqueue == NULL) { + snd_timer_close(tu->timeri); + return -ENOMEM; + } + } else { + tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); + if (tu->queue == NULL) { + snd_timer_close(tu->timeri); + return -ENOMEM; + } + } + + tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; + tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; + tu->timeri->ccallback = snd_timer_user_ccallback; + tu->timeri->callback_data = (void *)tu; + return 0; +} + +static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info) +{ + snd_timer_user_t *tu; + snd_timer_info_t *info; + snd_timer_t *t; + int err = 0; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + t = tu->timeri->timer; + snd_assert(t != NULL, return -ENXIO); + + info = kcalloc(1, sizeof(*info), GFP_KERNEL); + if (! info) + return -ENOMEM; + info->card = t->card ? t->card->number : -1; + if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) + info->flags |= SNDRV_TIMER_FLG_SLAVE; + strlcpy(info->id, t->id, sizeof(info->id)); + strlcpy(info->name, t->name, sizeof(info->name)); + info->resolution = t->hw.resolution; + if (copy_to_user(_info, info, sizeof(*_info))) + err = -EFAULT; + kfree(info); + return err; +} + +static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params) +{ + snd_timer_user_t *tu; + snd_timer_params_t params; + snd_timer_t *t; + snd_timer_read_t *tr; + snd_timer_tread_t *ttr; + int err; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + t = tu->timeri->timer; + snd_assert(t != NULL, return -ENXIO); + if (copy_from_user(¶ms, _params, sizeof(params))) + return -EFAULT; + if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { + err = -EINVAL; + goto _end; + } + if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) { + err = -EINVAL; + goto _end; + } + if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| + (1<<SNDRV_TIMER_EVENT_TICK)| + (1<<SNDRV_TIMER_EVENT_START)| + (1<<SNDRV_TIMER_EVENT_STOP)| + (1<<SNDRV_TIMER_EVENT_CONTINUE)| + (1<<SNDRV_TIMER_EVENT_PAUSE)| + (1<<SNDRV_TIMER_EVENT_MSTART)| + (1<<SNDRV_TIMER_EVENT_MSTOP)| + (1<<SNDRV_TIMER_EVENT_MCONTINUE)| + (1<<SNDRV_TIMER_EVENT_MPAUSE))) { + err = -EINVAL; + goto _end; + } + snd_timer_stop(tu->timeri); + spin_lock_irq(&t->lock); + tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| + SNDRV_TIMER_IFLG_EXCLUSIVE| + SNDRV_TIMER_IFLG_EARLY_EVENT); + if (params.flags & SNDRV_TIMER_PSFLG_AUTO) + tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; + if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) + tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; + if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) + tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; + spin_unlock_irq(&t->lock); + if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) { + if (tu->tread) { + ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); + if (ttr) { + kfree(tu->tqueue); + tu->queue_size = params.queue_size; + tu->tqueue = ttr; + } + } else { + tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); + if (tr) { + kfree(tu->queue); + tu->queue_size = params.queue_size; + tu->queue = tr; + } + } + } + tu->qhead = tu->qtail = tu->qused = 0; + if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { + if (tu->tread) { + snd_timer_tread_t tread; + tread.event = SNDRV_TIMER_EVENT_EARLY; + tread.tstamp.tv_sec = 0; + tread.tstamp.tv_nsec = 0; + tread.val = 0; + snd_timer_user_append_to_tqueue(tu, &tread); + } else { + snd_timer_read_t *r = &tu->queue[0]; + r->resolution = 0; + r->ticks = 0; + tu->qused++; + tu->qtail++; + } + + } + tu->filter = params.filter; + tu->ticks = params.ticks; + err = 0; + _end: + if (copy_to_user(_params, ¶ms, sizeof(params))) + return -EFAULT; + return err; +} + +static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status) +{ + snd_timer_user_t *tu; + snd_timer_status_t status; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + memset(&status, 0, sizeof(status)); + status.tstamp = tu->tstamp; + status.resolution = snd_timer_resolution(tu->timeri); + status.lost = tu->timeri->lost; + status.overrun = tu->overrun; + spin_lock_irq(&tu->qlock); + status.queue = tu->qused; + spin_unlock_irq(&tu->qlock); + if (copy_to_user(_status, &status, sizeof(status))) + return -EFAULT; + return 0; +} + +static int snd_timer_user_start(struct file *file) +{ + int err; + snd_timer_user_t *tu; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + snd_timer_stop(tu->timeri); + tu->timeri->lost = 0; + tu->last_resolution = 0; + return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; +} + +static int snd_timer_user_stop(struct file *file) +{ + int err; + snd_timer_user_t *tu; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; +} + +static int snd_timer_user_continue(struct file *file) +{ + int err; + snd_timer_user_t *tu; + + tu = file->private_data; + snd_assert(tu->timeri != NULL, return -ENXIO); + tu->timeri->lost = 0; + return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; +} + +static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + snd_timer_user_t *tu; + void __user *argp = (void __user *)arg; + int __user *p = argp; + + tu = file->private_data; + switch (cmd) { + case SNDRV_TIMER_IOCTL_PVERSION: + return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; + case SNDRV_TIMER_IOCTL_NEXT_DEVICE: + return snd_timer_user_next_device(argp); + case SNDRV_TIMER_IOCTL_TREAD: + { + int xarg; + + if (tu->timeri) /* too late */ + return -EBUSY; + if (get_user(xarg, p)) + return -EFAULT; + tu->tread = xarg ? 1 : 0; + return 0; + } + case SNDRV_TIMER_IOCTL_GINFO: + return snd_timer_user_ginfo(file, argp); + case SNDRV_TIMER_IOCTL_GPARAMS: + return snd_timer_user_gparams(file, argp); + case SNDRV_TIMER_IOCTL_GSTATUS: + return snd_timer_user_gstatus(file, argp); + case SNDRV_TIMER_IOCTL_SELECT: + return snd_timer_user_tselect(file, argp); + case SNDRV_TIMER_IOCTL_INFO: + return snd_timer_user_info(file, argp); + case SNDRV_TIMER_IOCTL_PARAMS: + return snd_timer_user_params(file, argp); + case SNDRV_TIMER_IOCTL_STATUS: + return snd_timer_user_status(file, argp); + case SNDRV_TIMER_IOCTL_START: + return snd_timer_user_start(file); + case SNDRV_TIMER_IOCTL_STOP: + return snd_timer_user_stop(file); + case SNDRV_TIMER_IOCTL_CONTINUE: + return snd_timer_user_continue(file); + } + return -ENOTTY; +} + +static int snd_timer_user_fasync(int fd, struct file * file, int on) +{ + snd_timer_user_t *tu; + int err; + + tu = file->private_data; + err = fasync_helper(fd, file, on, &tu->fasync); + if (err < 0) + return err; + return 0; +} + +static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) +{ + snd_timer_user_t *tu; + long result = 0, unit; + int err = 0; + + tu = file->private_data; + unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t); + spin_lock_irq(&tu->qlock); + while ((long)count - result >= unit) { + while (!tu->qused) { + wait_queue_t wait; + + if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { + err = -EAGAIN; + break; + } + + set_current_state(TASK_INTERRUPTIBLE); + init_waitqueue_entry(&wait, current); + add_wait_queue(&tu->qchange_sleep, &wait); + + spin_unlock_irq(&tu->qlock); + schedule(); + spin_lock_irq(&tu->qlock); + + remove_wait_queue(&tu->qchange_sleep, &wait); + + if (signal_pending(current)) { + err = -ERESTARTSYS; + break; + } + } + + spin_unlock_irq(&tu->qlock); + if (err < 0) + goto _error; + + if (tu->tread) { + if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) { + err = -EFAULT; + goto _error; + } + } else { + if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) { + err = -EFAULT; + goto _error; + } + } + + tu->qhead %= tu->queue_size; + + result += unit; + buffer += unit; + + spin_lock_irq(&tu->qlock); + tu->qused--; + } + spin_unlock_irq(&tu->qlock); + _error: + return result > 0 ? result : err; +} + +static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) +{ + unsigned int mask; + snd_timer_user_t *tu; + + tu = file->private_data; + + poll_wait(file, &tu->qchange_sleep, wait); + + mask = 0; + if (tu->qused) + mask |= POLLIN | POLLRDNORM; + + return mask; +} + +#ifdef CONFIG_COMPAT +#include "timer_compat.c" +#else +#define snd_timer_user_ioctl_compat NULL +#endif + +static struct file_operations snd_timer_f_ops = +{ + .owner = THIS_MODULE, + .read = snd_timer_user_read, + .open = snd_timer_user_open, + .release = snd_timer_user_release, + .poll = snd_timer_user_poll, + .unlocked_ioctl = snd_timer_user_ioctl, + .compat_ioctl = snd_timer_user_ioctl_compat, + .fasync = snd_timer_user_fasync, +}; + +static snd_minor_t snd_timer_reg = +{ + .comment = "timer", + .f_ops = &snd_timer_f_ops, +}; + +/* + * ENTRY functions + */ + +static snd_info_entry_t *snd_timer_proc_entry = NULL; + +static int __init alsa_timer_init(void) +{ + int err; + snd_info_entry_t *entry; + +#ifdef SNDRV_OSS_INFO_DEV_TIMERS + snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer"); +#endif + if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) { + entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; + entry->c.text.read = snd_timer_proc_read; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + } + snd_timer_proc_entry = entry; + if ((err = snd_timer_register_system()) < 0) + snd_printk(KERN_ERR "unable to register system timer (%i)\n", err); + if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, + NULL, 0, &snd_timer_reg, "timer"))<0) + snd_printk(KERN_ERR "unable to register timer device (%i)\n", err); + return 0; +} + +static void __exit alsa_timer_exit(void) +{ + struct list_head *p, *n; + + snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); + /* unregister the system timer */ + list_for_each_safe(p, n, &snd_timer_list) { + snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); + snd_timer_unregister(timer); + } + if (snd_timer_proc_entry) { + snd_info_unregister(snd_timer_proc_entry); + snd_timer_proc_entry = NULL; + } +#ifdef SNDRV_OSS_INFO_DEV_TIMERS + snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); +#endif +} + +module_init(alsa_timer_init) +module_exit(alsa_timer_exit) + +EXPORT_SYMBOL(snd_timer_open); +EXPORT_SYMBOL(snd_timer_close); +EXPORT_SYMBOL(snd_timer_resolution); +EXPORT_SYMBOL(snd_timer_start); +EXPORT_SYMBOL(snd_timer_stop); +EXPORT_SYMBOL(snd_timer_continue); +EXPORT_SYMBOL(snd_timer_pause); +EXPORT_SYMBOL(snd_timer_new); +EXPORT_SYMBOL(snd_timer_notify); +EXPORT_SYMBOL(snd_timer_global_new); +EXPORT_SYMBOL(snd_timer_global_free); +EXPORT_SYMBOL(snd_timer_global_register); +EXPORT_SYMBOL(snd_timer_global_unregister); +EXPORT_SYMBOL(snd_timer_interrupt); +EXPORT_SYMBOL(snd_timer_system_resolution); |