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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/core/timer.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'sound/core/timer.c')
-rw-r--r--sound/core/timer.c1901
1 files changed, 1901 insertions, 0 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c
new file mode 100644
index 0000000..fa762ca
--- /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(&register_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(&register_mutex);
+ *ti = timeri;
+ return 0;
+ }
+
+ /* open a master instance */
+ down(&register_mutex);
+ timer = snd_timer_find(tid);
+#ifdef CONFIG_KMOD
+ if (timer == NULL) {
+ up(&register_mutex);
+ snd_timer_request(tid);
+ down(&register_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(&register_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(&register_mutex);
+ return -ENODEV;
+ }
+ up(&register_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(&register_mutex);
+ list_del(&timeri->open_list);
+ up(&register_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(&register_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(&register_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(&register_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(&register_mutex);
+ return -EBUSY;
+ }
+ list_add_tail(&timer->device_list, p);
+ up(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&register_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(&params, _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, &params, 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);
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