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![Ingo Molnar](/assets/img/avatar_default.png)
Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2135 lines
54 KiB
C
2135 lines
54 KiB
C
/*
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* Timers abstract layer
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sched/signal.h>
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#include <sound/core.h>
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#include <sound/timer.h>
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#include <sound/control.h>
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#include <sound/info.h>
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#include <sound/minors.h>
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#include <sound/initval.h>
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#include <linux/kmod.h>
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/* internal flags */
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#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
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#if IS_ENABLED(CONFIG_SND_HRTIMER)
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#define DEFAULT_TIMER_LIMIT 4
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#else
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#define DEFAULT_TIMER_LIMIT 1
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#endif
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static int timer_limit = DEFAULT_TIMER_LIMIT;
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static int timer_tstamp_monotonic = 1;
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
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MODULE_DESCRIPTION("ALSA timer interface");
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MODULE_LICENSE("GPL");
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module_param(timer_limit, int, 0444);
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MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
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module_param(timer_tstamp_monotonic, int, 0444);
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MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
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MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
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MODULE_ALIAS("devname:snd/timer");
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struct snd_timer_user {
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struct snd_timer_instance *timeri;
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int tread; /* enhanced read with timestamps and events */
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unsigned long ticks;
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unsigned long overrun;
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int qhead;
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int qtail;
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int qused;
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int queue_size;
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bool disconnected;
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struct snd_timer_read *queue;
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struct snd_timer_tread *tqueue;
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spinlock_t qlock;
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unsigned long last_resolution;
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unsigned int filter;
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struct timespec tstamp; /* trigger tstamp */
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wait_queue_head_t qchange_sleep;
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struct fasync_struct *fasync;
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struct mutex ioctl_lock;
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};
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/* list of timers */
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static LIST_HEAD(snd_timer_list);
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/* list of slave instances */
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static LIST_HEAD(snd_timer_slave_list);
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/* lock for slave active lists */
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static DEFINE_SPINLOCK(slave_active_lock);
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static DEFINE_MUTEX(register_mutex);
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static int snd_timer_free(struct snd_timer *timer);
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static int snd_timer_dev_free(struct snd_device *device);
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static int snd_timer_dev_register(struct snd_device *device);
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static int snd_timer_dev_disconnect(struct snd_device *device);
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static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
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/*
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* create a timer instance with the given owner string.
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* when timer is not NULL, increments the module counter
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*/
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static struct snd_timer_instance *snd_timer_instance_new(char *owner,
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struct snd_timer *timer)
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{
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struct snd_timer_instance *timeri;
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timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
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if (timeri == NULL)
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return NULL;
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timeri->owner = kstrdup(owner, GFP_KERNEL);
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if (! timeri->owner) {
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kfree(timeri);
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return NULL;
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}
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INIT_LIST_HEAD(&timeri->open_list);
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INIT_LIST_HEAD(&timeri->active_list);
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INIT_LIST_HEAD(&timeri->ack_list);
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INIT_LIST_HEAD(&timeri->slave_list_head);
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INIT_LIST_HEAD(&timeri->slave_active_head);
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timeri->timer = timer;
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if (timer && !try_module_get(timer->module)) {
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kfree(timeri->owner);
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kfree(timeri);
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return NULL;
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}
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return timeri;
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}
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/*
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* find a timer instance from the given timer id
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*/
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static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
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{
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struct snd_timer *timer = NULL;
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list_for_each_entry(timer, &snd_timer_list, device_list) {
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if (timer->tmr_class != tid->dev_class)
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continue;
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if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
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timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
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(timer->card == NULL ||
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timer->card->number != tid->card))
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continue;
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if (timer->tmr_device != tid->device)
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continue;
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if (timer->tmr_subdevice != tid->subdevice)
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continue;
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return timer;
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}
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return NULL;
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}
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#ifdef CONFIG_MODULES
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static void snd_timer_request(struct snd_timer_id *tid)
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{
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switch (tid->dev_class) {
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case SNDRV_TIMER_CLASS_GLOBAL:
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if (tid->device < timer_limit)
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request_module("snd-timer-%i", tid->device);
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break;
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case SNDRV_TIMER_CLASS_CARD:
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case SNDRV_TIMER_CLASS_PCM:
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if (tid->card < snd_ecards_limit)
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request_module("snd-card-%i", tid->card);
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break;
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default:
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break;
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}
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}
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#endif
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/*
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* look for a master instance matching with the slave id of the given slave.
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* when found, relink the open_link of the slave.
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*
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* call this with register_mutex down.
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*/
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static void snd_timer_check_slave(struct snd_timer_instance *slave)
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{
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struct snd_timer *timer;
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struct snd_timer_instance *master;
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/* FIXME: it's really dumb to look up all entries.. */
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list_for_each_entry(timer, &snd_timer_list, device_list) {
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list_for_each_entry(master, &timer->open_list_head, open_list) {
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if (slave->slave_class == master->slave_class &&
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slave->slave_id == master->slave_id) {
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list_move_tail(&slave->open_list,
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&master->slave_list_head);
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spin_lock_irq(&slave_active_lock);
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slave->master = master;
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slave->timer = master->timer;
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spin_unlock_irq(&slave_active_lock);
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return;
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}
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}
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}
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}
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/*
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* look for slave instances matching with the slave id of the given master.
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* when found, relink the open_link of slaves.
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*
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* call this with register_mutex down.
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*/
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static void snd_timer_check_master(struct snd_timer_instance *master)
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{
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struct snd_timer_instance *slave, *tmp;
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/* check all pending slaves */
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list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
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if (slave->slave_class == master->slave_class &&
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slave->slave_id == master->slave_id) {
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list_move_tail(&slave->open_list, &master->slave_list_head);
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spin_lock_irq(&slave_active_lock);
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spin_lock(&master->timer->lock);
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slave->master = master;
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slave->timer = master->timer;
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if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
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list_add_tail(&slave->active_list,
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&master->slave_active_head);
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spin_unlock(&master->timer->lock);
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spin_unlock_irq(&slave_active_lock);
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}
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}
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}
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/*
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* open a timer instance
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* when opening a master, the slave id must be here given.
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*/
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int snd_timer_open(struct snd_timer_instance **ti,
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char *owner, struct snd_timer_id *tid,
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unsigned int slave_id)
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{
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struct snd_timer *timer;
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struct snd_timer_instance *timeri = NULL;
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if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
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/* open a slave instance */
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if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
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tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
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pr_debug("ALSA: timer: invalid slave class %i\n",
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tid->dev_sclass);
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return -EINVAL;
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}
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mutex_lock(®ister_mutex);
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timeri = snd_timer_instance_new(owner, NULL);
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if (!timeri) {
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mutex_unlock(®ister_mutex);
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return -ENOMEM;
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}
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timeri->slave_class = tid->dev_sclass;
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timeri->slave_id = tid->device;
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timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
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list_add_tail(&timeri->open_list, &snd_timer_slave_list);
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snd_timer_check_slave(timeri);
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mutex_unlock(®ister_mutex);
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*ti = timeri;
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return 0;
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}
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/* open a master instance */
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mutex_lock(®ister_mutex);
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timer = snd_timer_find(tid);
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#ifdef CONFIG_MODULES
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if (!timer) {
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mutex_unlock(®ister_mutex);
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snd_timer_request(tid);
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mutex_lock(®ister_mutex);
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timer = snd_timer_find(tid);
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}
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#endif
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if (!timer) {
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mutex_unlock(®ister_mutex);
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return -ENODEV;
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}
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if (!list_empty(&timer->open_list_head)) {
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timeri = list_entry(timer->open_list_head.next,
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struct snd_timer_instance, open_list);
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if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
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mutex_unlock(®ister_mutex);
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return -EBUSY;
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}
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}
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timeri = snd_timer_instance_new(owner, timer);
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if (!timeri) {
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mutex_unlock(®ister_mutex);
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return -ENOMEM;
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}
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/* take a card refcount for safe disconnection */
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if (timer->card)
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get_device(&timer->card->card_dev);
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timeri->slave_class = tid->dev_sclass;
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timeri->slave_id = slave_id;
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if (list_empty(&timer->open_list_head) && timer->hw.open) {
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int err = timer->hw.open(timer);
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if (err) {
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kfree(timeri->owner);
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kfree(timeri);
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if (timer->card)
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put_device(&timer->card->card_dev);
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module_put(timer->module);
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mutex_unlock(®ister_mutex);
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return err;
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}
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}
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list_add_tail(&timeri->open_list, &timer->open_list_head);
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snd_timer_check_master(timeri);
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mutex_unlock(®ister_mutex);
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*ti = timeri;
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return 0;
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}
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/*
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* close a timer instance
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*/
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int snd_timer_close(struct snd_timer_instance *timeri)
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{
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struct snd_timer *timer = NULL;
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struct snd_timer_instance *slave, *tmp;
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if (snd_BUG_ON(!timeri))
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return -ENXIO;
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mutex_lock(®ister_mutex);
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list_del(&timeri->open_list);
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/* force to stop the timer */
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snd_timer_stop(timeri);
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timer = timeri->timer;
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if (timer) {
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/* wait, until the active callback is finished */
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spin_lock_irq(&timer->lock);
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while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
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spin_unlock_irq(&timer->lock);
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udelay(10);
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spin_lock_irq(&timer->lock);
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}
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spin_unlock_irq(&timer->lock);
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/* remove slave links */
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spin_lock_irq(&slave_active_lock);
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spin_lock(&timer->lock);
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list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
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open_list) {
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list_move_tail(&slave->open_list, &snd_timer_slave_list);
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slave->master = NULL;
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slave->timer = NULL;
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list_del_init(&slave->ack_list);
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list_del_init(&slave->active_list);
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}
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spin_unlock(&timer->lock);
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spin_unlock_irq(&slave_active_lock);
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/* slave doesn't need to release timer resources below */
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if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
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timer = NULL;
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}
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if (timeri->private_free)
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timeri->private_free(timeri);
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kfree(timeri->owner);
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kfree(timeri);
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if (timer) {
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if (list_empty(&timer->open_list_head) && timer->hw.close)
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timer->hw.close(timer);
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/* release a card refcount for safe disconnection */
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if (timer->card)
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put_device(&timer->card->card_dev);
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module_put(timer->module);
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}
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mutex_unlock(®ister_mutex);
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return 0;
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}
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unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
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{
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struct snd_timer * timer;
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if (timeri == NULL)
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return 0;
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if ((timer = timeri->timer) != NULL) {
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if (timer->hw.c_resolution)
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return timer->hw.c_resolution(timer);
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return timer->hw.resolution;
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}
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return 0;
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}
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static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
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{
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struct snd_timer *timer;
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unsigned long resolution = 0;
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struct snd_timer_instance *ts;
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struct timespec tstamp;
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if (timer_tstamp_monotonic)
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ktime_get_ts(&tstamp);
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else
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getnstimeofday(&tstamp);
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if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
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event > SNDRV_TIMER_EVENT_PAUSE))
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return;
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if (event == SNDRV_TIMER_EVENT_START ||
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event == SNDRV_TIMER_EVENT_CONTINUE)
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resolution = snd_timer_resolution(ti);
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if (ti->ccallback)
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ti->ccallback(ti, event, &tstamp, resolution);
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if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
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return;
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timer = ti->timer;
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if (timer == NULL)
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return;
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if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
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return;
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list_for_each_entry(ts, &ti->slave_active_head, active_list)
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if (ts->ccallback)
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ts->ccallback(ts, event + 100, &tstamp, resolution);
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}
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|
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/* start/continue a master timer */
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static int snd_timer_start1(struct snd_timer_instance *timeri,
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bool start, unsigned long ticks)
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{
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struct snd_timer *timer;
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int result;
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unsigned long flags;
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timer = timeri->timer;
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if (!timer)
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return -EINVAL;
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|
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spin_lock_irqsave(&timer->lock, flags);
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if (timer->card && timer->card->shutdown) {
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result = -ENODEV;
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goto unlock;
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}
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if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
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SNDRV_TIMER_IFLG_START)) {
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result = -EBUSY;
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goto unlock;
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}
|
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|
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if (start)
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timeri->ticks = timeri->cticks = ticks;
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else if (!timeri->cticks)
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timeri->cticks = 1;
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timeri->pticks = 0;
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|
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list_move_tail(&timeri->active_list, &timer->active_list_head);
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if (timer->running) {
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if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
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goto __start_now;
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timer->flags |= SNDRV_TIMER_FLG_RESCHED;
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timeri->flags |= SNDRV_TIMER_IFLG_START;
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result = 1; /* delayed start */
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} else {
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if (start)
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timer->sticks = ticks;
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timer->hw.start(timer);
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__start_now:
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timer->running++;
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timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
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result = 0;
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}
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snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
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SNDRV_TIMER_EVENT_CONTINUE);
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unlock:
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spin_unlock_irqrestore(&timer->lock, flags);
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return result;
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}
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|
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/* start/continue a slave timer */
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static int snd_timer_start_slave(struct snd_timer_instance *timeri,
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bool start)
|
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{
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unsigned long flags;
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|
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spin_lock_irqsave(&slave_active_lock, flags);
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if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
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spin_unlock_irqrestore(&slave_active_lock, flags);
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return -EBUSY;
|
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}
|
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timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
|
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if (timeri->master && timeri->timer) {
|
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spin_lock(&timeri->timer->lock);
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list_add_tail(&timeri->active_list,
|
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&timeri->master->slave_active_head);
|
|
snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
|
|
SNDRV_TIMER_EVENT_CONTINUE);
|
|
spin_unlock(&timeri->timer->lock);
|
|
}
|
|
spin_unlock_irqrestore(&slave_active_lock, flags);
|
|
return 1; /* delayed start */
|
|
}
|
|
|
|
/* stop/pause a master timer */
|
|
static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
|
|
{
|
|
struct snd_timer *timer;
|
|
int result = 0;
|
|
unsigned long flags;
|
|
|
|
timer = timeri->timer;
|
|
if (!timer)
|
|
return -EINVAL;
|
|
spin_lock_irqsave(&timer->lock, flags);
|
|
if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
|
|
SNDRV_TIMER_IFLG_START))) {
|
|
result = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
list_del_init(&timeri->ack_list);
|
|
list_del_init(&timeri->active_list);
|
|
if (timer->card && timer->card->shutdown)
|
|
goto unlock;
|
|
if (stop) {
|
|
timeri->cticks = timeri->ticks;
|
|
timeri->pticks = 0;
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
|
|
if (stop)
|
|
timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
|
|
else
|
|
timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
|
|
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
|
|
SNDRV_TIMER_EVENT_CONTINUE);
|
|
unlock:
|
|
spin_unlock_irqrestore(&timer->lock, flags);
|
|
return result;
|
|
}
|
|
|
|
/* stop/pause a slave timer */
|
|
static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&slave_active_lock, flags);
|
|
if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
|
|
spin_unlock_irqrestore(&slave_active_lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
|
|
if (timeri->timer) {
|
|
spin_lock(&timeri->timer->lock);
|
|
list_del_init(&timeri->ack_list);
|
|
list_del_init(&timeri->active_list);
|
|
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
|
|
SNDRV_TIMER_EVENT_CONTINUE);
|
|
spin_unlock(&timeri->timer->lock);
|
|
}
|
|
spin_unlock_irqrestore(&slave_active_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* start the timer instance
|
|
*/
|
|
int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
|
|
{
|
|
if (timeri == NULL || ticks < 1)
|
|
return -EINVAL;
|
|
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
|
|
return snd_timer_start_slave(timeri, true);
|
|
else
|
|
return snd_timer_start1(timeri, true, ticks);
|
|
}
|
|
|
|
/*
|
|
* stop the timer instance.
|
|
*
|
|
* do not call this from the timer callback!
|
|
*/
|
|
int snd_timer_stop(struct snd_timer_instance *timeri)
|
|
{
|
|
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
|
|
return snd_timer_stop_slave(timeri, true);
|
|
else
|
|
return snd_timer_stop1(timeri, true);
|
|
}
|
|
|
|
/*
|
|
* start again.. the tick is kept.
|
|
*/
|
|
int snd_timer_continue(struct snd_timer_instance *timeri)
|
|
{
|
|
/* timer can continue only after pause */
|
|
if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
|
|
return -EINVAL;
|
|
|
|
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
|
|
return snd_timer_start_slave(timeri, false);
|
|
else
|
|
return snd_timer_start1(timeri, false, 0);
|
|
}
|
|
|
|
/*
|
|
* pause.. remember the ticks left
|
|
*/
|
|
int snd_timer_pause(struct snd_timer_instance * timeri)
|
|
{
|
|
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
|
|
return snd_timer_stop_slave(timeri, false);
|
|
else
|
|
return snd_timer_stop1(timeri, false);
|
|
}
|
|
|
|
/*
|
|
* 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(struct snd_timer * timer, unsigned long ticks_left)
|
|
{
|
|
struct snd_timer_instance *ti;
|
|
unsigned long ticks = ~0UL;
|
|
|
|
list_for_each_entry(ti, &timer->active_list_head, 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)
|
|
{
|
|
struct snd_timer *timer = (struct snd_timer *) arg;
|
|
struct snd_timer_instance *ti;
|
|
struct list_head *p;
|
|
unsigned long resolution, ticks;
|
|
unsigned long flags;
|
|
|
|
if (timer->card && timer->card->shutdown)
|
|
return;
|
|
|
|
spin_lock_irqsave(&timer->lock, flags);
|
|
/* now process all callbacks */
|
|
while (!list_empty(&timer->sack_list_head)) {
|
|
p = timer->sack_list_head.next; /* get first item */
|
|
ti = list_entry(p, struct snd_timer_instance, 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_irqrestore(&timer->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* timer interrupt
|
|
*
|
|
* ticks_left is usually equal to timer->sticks.
|
|
*
|
|
*/
|
|
void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
|
|
{
|
|
struct snd_timer_instance *ti, *ts, *tmp;
|
|
unsigned long resolution, ticks;
|
|
struct list_head *p, *ack_list_head;
|
|
unsigned long flags;
|
|
int use_tasklet = 0;
|
|
|
|
if (timer == NULL)
|
|
return;
|
|
|
|
if (timer->card && timer->card->shutdown)
|
|
return;
|
|
|
|
spin_lock_irqsave(&timer->lock, flags);
|
|
|
|
/* 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_entry because the active_list of a
|
|
* processed instance is relinked to done_list_head before the callback
|
|
* is called.
|
|
*/
|
|
list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
|
|
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;
|
|
--timer->running;
|
|
list_del_init(&ti->active_list);
|
|
}
|
|
if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
|
|
(ti->flags & SNDRV_TIMER_IFLG_FAST))
|
|
ack_list_head = &timer->ack_list_head;
|
|
else
|
|
ack_list_head = &timer->sack_list_head;
|
|
if (list_empty(&ti->ack_list))
|
|
list_add_tail(&ti->ack_list, ack_list_head);
|
|
list_for_each_entry(ts, &ti->slave_active_head, active_list) {
|
|
ts->pticks = ti->pticks;
|
|
ts->resolution = resolution;
|
|
if (list_empty(&ts->ack_list))
|
|
list_add_tail(&ts->ack_list, ack_list_head);
|
|
}
|
|
}
|
|
if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
|
|
snd_timer_reschedule(timer, timer->sticks);
|
|
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 = list_entry(p, struct snd_timer_instance, 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_irqrestore(&timer->lock, flags);
|
|
|
|
if (use_tasklet)
|
|
tasklet_schedule(&timer->task_queue);
|
|
}
|
|
|
|
/*
|
|
|
|
*/
|
|
|
|
int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
|
|
struct snd_timer **rtimer)
|
|
{
|
|
struct snd_timer *timer;
|
|
int err;
|
|
static struct snd_device_ops ops = {
|
|
.dev_free = snd_timer_dev_free,
|
|
.dev_register = snd_timer_dev_register,
|
|
.dev_disconnect = snd_timer_dev_disconnect,
|
|
};
|
|
|
|
if (snd_BUG_ON(!tid))
|
|
return -EINVAL;
|
|
if (rtimer)
|
|
*rtimer = NULL;
|
|
timer = kzalloc(sizeof(*timer), GFP_KERNEL);
|
|
if (!timer)
|
|
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));
|
|
timer->sticks = 1;
|
|
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) {
|
|
timer->module = card->module;
|
|
err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
|
|
if (err < 0) {
|
|
snd_timer_free(timer);
|
|
return err;
|
|
}
|
|
}
|
|
if (rtimer)
|
|
*rtimer = timer;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_free(struct snd_timer *timer)
|
|
{
|
|
if (!timer)
|
|
return 0;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
if (! list_empty(&timer->open_list_head)) {
|
|
struct list_head *p, *n;
|
|
struct snd_timer_instance *ti;
|
|
pr_warn("ALSA: timer %p is busy?\n", timer);
|
|
list_for_each_safe(p, n, &timer->open_list_head) {
|
|
list_del_init(p);
|
|
ti = list_entry(p, struct snd_timer_instance, open_list);
|
|
ti->timer = NULL;
|
|
}
|
|
}
|
|
list_del(&timer->device_list);
|
|
mutex_unlock(®ister_mutex);
|
|
|
|
if (timer->private_free)
|
|
timer->private_free(timer);
|
|
kfree(timer);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_dev_free(struct snd_device *device)
|
|
{
|
|
struct snd_timer *timer = device->device_data;
|
|
return snd_timer_free(timer);
|
|
}
|
|
|
|
static int snd_timer_dev_register(struct snd_device *dev)
|
|
{
|
|
struct snd_timer *timer = dev->device_data;
|
|
struct snd_timer *timer1;
|
|
|
|
if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
|
|
return -ENXIO;
|
|
if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
|
|
!timer->hw.resolution && timer->hw.c_resolution == NULL)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
list_for_each_entry(timer1, &snd_timer_list, 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.. */
|
|
mutex_unlock(®ister_mutex);
|
|
return -EBUSY;
|
|
}
|
|
list_add_tail(&timer->device_list, &timer1->device_list);
|
|
mutex_unlock(®ister_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_dev_disconnect(struct snd_device *device)
|
|
{
|
|
struct snd_timer *timer = device->device_data;
|
|
struct snd_timer_instance *ti;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
list_del_init(&timer->device_list);
|
|
/* wake up pending sleepers */
|
|
list_for_each_entry(ti, &timer->open_list_head, open_list) {
|
|
if (ti->disconnect)
|
|
ti->disconnect(ti);
|
|
}
|
|
mutex_unlock(®ister_mutex);
|
|
return 0;
|
|
}
|
|
|
|
void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long resolution = 0;
|
|
struct snd_timer_instance *ti, *ts;
|
|
|
|
if (timer->card && timer->card->shutdown)
|
|
return;
|
|
if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
|
|
return;
|
|
if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
|
|
event > SNDRV_TIMER_EVENT_MRESUME))
|
|
return;
|
|
spin_lock_irqsave(&timer->lock, flags);
|
|
if (event == SNDRV_TIMER_EVENT_MSTART ||
|
|
event == SNDRV_TIMER_EVENT_MCONTINUE ||
|
|
event == SNDRV_TIMER_EVENT_MRESUME) {
|
|
if (timer->hw.c_resolution)
|
|
resolution = timer->hw.c_resolution(timer);
|
|
else
|
|
resolution = timer->hw.resolution;
|
|
}
|
|
list_for_each_entry(ti, &timer->active_list_head, active_list) {
|
|
if (ti->ccallback)
|
|
ti->ccallback(ti, event, tstamp, resolution);
|
|
list_for_each_entry(ts, &ti->slave_active_head, 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, struct snd_timer **rtimer)
|
|
{
|
|
struct snd_timer_id 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(struct snd_timer *timer)
|
|
{
|
|
return snd_timer_free(timer);
|
|
}
|
|
|
|
int snd_timer_global_register(struct snd_timer *timer)
|
|
{
|
|
struct snd_device dev;
|
|
|
|
memset(&dev, 0, sizeof(dev));
|
|
dev.device_data = timer;
|
|
return snd_timer_dev_register(&dev);
|
|
}
|
|
|
|
/*
|
|
* System timer
|
|
*/
|
|
|
|
struct snd_timer_system_private {
|
|
struct timer_list tlist;
|
|
unsigned long last_expires;
|
|
unsigned long last_jiffies;
|
|
unsigned long correction;
|
|
};
|
|
|
|
static void snd_timer_s_function(unsigned long data)
|
|
{
|
|
struct snd_timer *timer = (struct snd_timer *)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(struct snd_timer * 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 = 0;
|
|
}
|
|
priv->last_expires = njiff;
|
|
mod_timer(&priv->tlist, njiff);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_s_stop(struct snd_timer * 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;
|
|
priv->correction = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_s_close(struct snd_timer *timer)
|
|
{
|
|
struct snd_timer_system_private *priv;
|
|
|
|
priv = (struct snd_timer_system_private *)timer->private_data;
|
|
del_timer_sync(&priv->tlist);
|
|
return 0;
|
|
}
|
|
|
|
static struct snd_timer_hardware snd_timer_system =
|
|
{
|
|
.flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
|
|
.resolution = 1000000000L / HZ,
|
|
.ticks = 10000000L,
|
|
.close = snd_timer_s_close,
|
|
.start = snd_timer_s_start,
|
|
.stop = snd_timer_s_stop
|
|
};
|
|
|
|
static void snd_timer_free_system(struct snd_timer *timer)
|
|
{
|
|
kfree(timer->private_data);
|
|
}
|
|
|
|
static int snd_timer_register_system(void)
|
|
{
|
|
struct snd_timer *timer;
|
|
struct snd_timer_system_private *priv;
|
|
int err;
|
|
|
|
err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
|
|
if (err < 0)
|
|
return err;
|
|
strcpy(timer->name, "system timer");
|
|
timer->hw = snd_timer_system;
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (priv == NULL) {
|
|
snd_timer_free(timer);
|
|
return -ENOMEM;
|
|
}
|
|
setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
|
|
timer->private_data = priv;
|
|
timer->private_free = snd_timer_free_system;
|
|
return snd_timer_global_register(timer);
|
|
}
|
|
|
|
#ifdef CONFIG_SND_PROC_FS
|
|
/*
|
|
* Info interface
|
|
*/
|
|
|
|
static void snd_timer_proc_read(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct snd_timer *timer;
|
|
struct snd_timer_instance *ti;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
list_for_each_entry(timer, &snd_timer_list, device_list) {
|
|
if (timer->card && timer->card->shutdown)
|
|
continue;
|
|
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");
|
|
list_for_each_entry(ti, &timer->open_list_head, open_list)
|
|
snd_iprintf(buffer, " Client %s : %s\n",
|
|
ti->owner ? ti->owner : "unknown",
|
|
ti->flags & (SNDRV_TIMER_IFLG_START |
|
|
SNDRV_TIMER_IFLG_RUNNING)
|
|
? "running" : "stopped");
|
|
}
|
|
mutex_unlock(®ister_mutex);
|
|
}
|
|
|
|
static struct snd_info_entry *snd_timer_proc_entry;
|
|
|
|
static void __init snd_timer_proc_init(void)
|
|
{
|
|
struct snd_info_entry *entry;
|
|
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
|
|
if (entry != NULL) {
|
|
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;
|
|
}
|
|
|
|
static void __exit snd_timer_proc_done(void)
|
|
{
|
|
snd_info_free_entry(snd_timer_proc_entry);
|
|
}
|
|
#else /* !CONFIG_SND_PROC_FS */
|
|
#define snd_timer_proc_init()
|
|
#define snd_timer_proc_done()
|
|
#endif
|
|
|
|
/*
|
|
* USER SPACE interface
|
|
*/
|
|
|
|
static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
|
|
unsigned long resolution,
|
|
unsigned long ticks)
|
|
{
|
|
struct snd_timer_user *tu = timeri->callback_data;
|
|
struct snd_timer_read *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(struct snd_timer_user *tu,
|
|
struct snd_timer_tread *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(struct snd_timer_instance *timeri,
|
|
int event,
|
|
struct timespec *tstamp,
|
|
unsigned long resolution)
|
|
{
|
|
struct snd_timer_user *tu = timeri->callback_data;
|
|
struct snd_timer_tread r1;
|
|
unsigned long flags;
|
|
|
|
if (event >= SNDRV_TIMER_EVENT_START &&
|
|
event <= SNDRV_TIMER_EVENT_PAUSE)
|
|
tu->tstamp = *tstamp;
|
|
if ((tu->filter & (1 << event)) == 0 || !tu->tread)
|
|
return;
|
|
memset(&r1, 0, sizeof(r1));
|
|
r1.event = event;
|
|
r1.tstamp = *tstamp;
|
|
r1.val = resolution;
|
|
spin_lock_irqsave(&tu->qlock, flags);
|
|
snd_timer_user_append_to_tqueue(tu, &r1);
|
|
spin_unlock_irqrestore(&tu->qlock, flags);
|
|
kill_fasync(&tu->fasync, SIGIO, POLL_IN);
|
|
wake_up(&tu->qchange_sleep);
|
|
}
|
|
|
|
static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
|
|
{
|
|
struct snd_timer_user *tu = timeri->callback_data;
|
|
|
|
tu->disconnected = true;
|
|
wake_up(&tu->qchange_sleep);
|
|
}
|
|
|
|
static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
|
|
unsigned long resolution,
|
|
unsigned long ticks)
|
|
{
|
|
struct snd_timer_user *tu = timeri->callback_data;
|
|
struct snd_timer_tread *r, r1;
|
|
struct timespec tstamp;
|
|
int prev, append = 0;
|
|
|
|
memset(&tstamp, 0, sizeof(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) {
|
|
if (timer_tstamp_monotonic)
|
|
ktime_get_ts(&tstamp);
|
|
else
|
|
getnstimeofday(&tstamp);
|
|
}
|
|
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
|
|
tu->last_resolution != resolution) {
|
|
memset(&r1, 0, sizeof(r1));
|
|
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)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
int err;
|
|
|
|
err = nonseekable_open(inode, file);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tu = kzalloc(sizeof(*tu), GFP_KERNEL);
|
|
if (tu == NULL)
|
|
return -ENOMEM;
|
|
spin_lock_init(&tu->qlock);
|
|
init_waitqueue_head(&tu->qchange_sleep);
|
|
mutex_init(&tu->ioctl_lock);
|
|
tu->ticks = 1;
|
|
tu->queue_size = 128;
|
|
tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
|
|
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)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
|
|
if (file->private_data) {
|
|
tu = file->private_data;
|
|
file->private_data = NULL;
|
|
mutex_lock(&tu->ioctl_lock);
|
|
if (tu->timeri)
|
|
snd_timer_close(tu->timeri);
|
|
mutex_unlock(&tu->ioctl_lock);
|
|
kfree(tu->queue);
|
|
kfree(tu->tqueue);
|
|
kfree(tu);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void snd_timer_user_zero_id(struct snd_timer_id *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(struct snd_timer_id *id, struct snd_timer *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(struct snd_timer_id __user *_tid)
|
|
{
|
|
struct snd_timer_id id;
|
|
struct snd_timer *timer;
|
|
struct list_head *p;
|
|
|
|
if (copy_from_user(&id, _tid, sizeof(id)))
|
|
return -EFAULT;
|
|
mutex_lock(®ister_mutex);
|
|
if (id.dev_class < 0) { /* first item */
|
|
if (list_empty(&snd_timer_list))
|
|
snd_timer_user_zero_id(&id);
|
|
else {
|
|
timer = list_entry(snd_timer_list.next,
|
|
struct snd_timer, 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 = list_entry(p, struct snd_timer, 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 {
|
|
if (id.subdevice < 0) {
|
|
id.subdevice = 0;
|
|
} else {
|
|
id.subdevice++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
list_for_each(p, &snd_timer_list) {
|
|
timer = list_entry(p, struct snd_timer, 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);
|
|
}
|
|
}
|
|
mutex_unlock(®ister_mutex);
|
|
if (copy_to_user(_tid, &id, sizeof(*_tid)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_timer_user_ginfo(struct file *file,
|
|
struct snd_timer_ginfo __user *_ginfo)
|
|
{
|
|
struct snd_timer_ginfo *ginfo;
|
|
struct snd_timer_id tid;
|
|
struct snd_timer *t;
|
|
struct list_head *p;
|
|
int err = 0;
|
|
|
|
ginfo = memdup_user(_ginfo, sizeof(*ginfo));
|
|
if (IS_ERR(ginfo))
|
|
return PTR_ERR(ginfo);
|
|
|
|
tid = ginfo->tid;
|
|
memset(ginfo, 0, sizeof(*ginfo));
|
|
ginfo->tid = tid;
|
|
mutex_lock(®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;
|
|
}
|
|
mutex_unlock(®ister_mutex);
|
|
if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
|
|
err = -EFAULT;
|
|
kfree(ginfo);
|
|
return err;
|
|
}
|
|
|
|
static int timer_set_gparams(struct snd_timer_gparams *gparams)
|
|
{
|
|
struct snd_timer *t;
|
|
int err;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
t = snd_timer_find(&gparams->tid);
|
|
if (!t) {
|
|
err = -ENODEV;
|
|
goto _error;
|
|
}
|
|
if (!list_empty(&t->open_list_head)) {
|
|
err = -EBUSY;
|
|
goto _error;
|
|
}
|
|
if (!t->hw.set_period) {
|
|
err = -ENOSYS;
|
|
goto _error;
|
|
}
|
|
err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
|
|
_error:
|
|
mutex_unlock(®ister_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int snd_timer_user_gparams(struct file *file,
|
|
struct snd_timer_gparams __user *_gparams)
|
|
{
|
|
struct snd_timer_gparams gparams;
|
|
|
|
if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
|
|
return -EFAULT;
|
|
return timer_set_gparams(&gparams);
|
|
}
|
|
|
|
static int snd_timer_user_gstatus(struct file *file,
|
|
struct snd_timer_gstatus __user *_gstatus)
|
|
{
|
|
struct snd_timer_gstatus gstatus;
|
|
struct snd_timer_id tid;
|
|
struct snd_timer *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;
|
|
mutex_lock(®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;
|
|
}
|
|
mutex_unlock(®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,
|
|
struct snd_timer_select __user *_tselect)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
struct snd_timer_select tselect;
|
|
char str[32];
|
|
int err = 0;
|
|
|
|
tu = file->private_data;
|
|
if (tu->timeri) {
|
|
snd_timer_close(tu->timeri);
|
|
tu->timeri = NULL;
|
|
}
|
|
if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
|
|
err = -EFAULT;
|
|
goto __err;
|
|
}
|
|
sprintf(str, "application %i", current->pid);
|
|
if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
|
|
tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
|
|
err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
|
|
if (err < 0)
|
|
goto __err;
|
|
|
|
kfree(tu->queue);
|
|
tu->queue = NULL;
|
|
kfree(tu->tqueue);
|
|
tu->tqueue = NULL;
|
|
if (tu->tread) {
|
|
tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
|
|
GFP_KERNEL);
|
|
if (tu->tqueue == NULL)
|
|
err = -ENOMEM;
|
|
} else {
|
|
tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
|
|
GFP_KERNEL);
|
|
if (tu->queue == NULL)
|
|
err = -ENOMEM;
|
|
}
|
|
|
|
if (err < 0) {
|
|
snd_timer_close(tu->timeri);
|
|
tu->timeri = NULL;
|
|
} else {
|
|
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;
|
|
tu->timeri->disconnect = snd_timer_user_disconnect;
|
|
}
|
|
|
|
__err:
|
|
return err;
|
|
}
|
|
|
|
static int snd_timer_user_info(struct file *file,
|
|
struct snd_timer_info __user *_info)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
struct snd_timer_info *info;
|
|
struct snd_timer *t;
|
|
int err = 0;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
t = tu->timeri->timer;
|
|
if (!t)
|
|
return -EBADFD;
|
|
|
|
info = kzalloc(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,
|
|
struct snd_timer_params __user *_params)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
struct snd_timer_params params;
|
|
struct snd_timer *t;
|
|
struct snd_timer_read *tr;
|
|
struct snd_timer_tread *ttr;
|
|
int err;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
t = tu->timeri->timer;
|
|
if (!t)
|
|
return -EBADFD;
|
|
if (copy_from_user(¶ms, _params, sizeof(params)))
|
|
return -EFAULT;
|
|
if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
|
|
u64 resolution;
|
|
|
|
if (params.ticks < 1) {
|
|
err = -EINVAL;
|
|
goto _end;
|
|
}
|
|
|
|
/* Don't allow resolution less than 1ms */
|
|
resolution = snd_timer_resolution(tu->timeri);
|
|
resolution *= params.ticks;
|
|
if (resolution < 1000000) {
|
|
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_SUSPEND)|
|
|
(1<<SNDRV_TIMER_EVENT_RESUME)|
|
|
(1<<SNDRV_TIMER_EVENT_MSTART)|
|
|
(1<<SNDRV_TIMER_EVENT_MSTOP)|
|
|
(1<<SNDRV_TIMER_EVENT_MCONTINUE)|
|
|
(1<<SNDRV_TIMER_EVENT_MPAUSE)|
|
|
(1<<SNDRV_TIMER_EVENT_MSUSPEND)|
|
|
(1<<SNDRV_TIMER_EVENT_MRESUME))) {
|
|
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 = kmalloc(params.queue_size * sizeof(*ttr),
|
|
GFP_KERNEL);
|
|
if (ttr) {
|
|
kfree(tu->tqueue);
|
|
tu->queue_size = params.queue_size;
|
|
tu->tqueue = ttr;
|
|
}
|
|
} else {
|
|
tr = kmalloc(params.queue_size * sizeof(*tr),
|
|
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) {
|
|
struct snd_timer_tread tread;
|
|
memset(&tread, 0, sizeof(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 {
|
|
struct snd_timer_read *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,
|
|
struct snd_timer_status __user *_status)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
struct snd_timer_status status;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
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;
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
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;
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
|
|
}
|
|
|
|
static int snd_timer_user_continue(struct file *file)
|
|
{
|
|
int err;
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
/* start timer instead of continue if it's not used before */
|
|
if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
|
|
return snd_timer_user_start(file);
|
|
tu->timeri->lost = 0;
|
|
return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
|
|
}
|
|
|
|
static int snd_timer_user_pause(struct file *file)
|
|
{
|
|
int err;
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
if (!tu->timeri)
|
|
return -EBADFD;
|
|
return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
|
|
}
|
|
|
|
enum {
|
|
SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
|
|
SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
|
|
SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
|
|
SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
|
|
};
|
|
|
|
static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct snd_timer_user *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:
|
|
case SNDRV_TIMER_IOCTL_START_OLD:
|
|
return snd_timer_user_start(file);
|
|
case SNDRV_TIMER_IOCTL_STOP:
|
|
case SNDRV_TIMER_IOCTL_STOP_OLD:
|
|
return snd_timer_user_stop(file);
|
|
case SNDRV_TIMER_IOCTL_CONTINUE:
|
|
case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
|
|
return snd_timer_user_continue(file);
|
|
case SNDRV_TIMER_IOCTL_PAUSE:
|
|
case SNDRV_TIMER_IOCTL_PAUSE_OLD:
|
|
return snd_timer_user_pause(file);
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct snd_timer_user *tu = file->private_data;
|
|
long ret;
|
|
|
|
mutex_lock(&tu->ioctl_lock);
|
|
ret = __snd_timer_user_ioctl(file, cmd, arg);
|
|
mutex_unlock(&tu->ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int snd_timer_user_fasync(int fd, struct file * file, int on)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
return fasync_helper(fd, file, on, &tu->fasync);
|
|
}
|
|
|
|
static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct snd_timer_user *tu;
|
|
long result = 0, unit;
|
|
int qhead;
|
|
int err = 0;
|
|
|
|
tu = file->private_data;
|
|
unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
|
|
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;
|
|
goto _error;
|
|
}
|
|
|
|
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 (tu->disconnected) {
|
|
err = -ENODEV;
|
|
goto _error;
|
|
}
|
|
if (signal_pending(current)) {
|
|
err = -ERESTARTSYS;
|
|
goto _error;
|
|
}
|
|
}
|
|
|
|
qhead = tu->qhead++;
|
|
tu->qhead %= tu->queue_size;
|
|
tu->qused--;
|
|
spin_unlock_irq(&tu->qlock);
|
|
|
|
mutex_lock(&tu->ioctl_lock);
|
|
if (tu->tread) {
|
|
if (copy_to_user(buffer, &tu->tqueue[qhead],
|
|
sizeof(struct snd_timer_tread)))
|
|
err = -EFAULT;
|
|
} else {
|
|
if (copy_to_user(buffer, &tu->queue[qhead],
|
|
sizeof(struct snd_timer_read)))
|
|
err = -EFAULT;
|
|
}
|
|
mutex_unlock(&tu->ioctl_lock);
|
|
|
|
spin_lock_irq(&tu->qlock);
|
|
if (err < 0)
|
|
goto _error;
|
|
result += unit;
|
|
buffer += unit;
|
|
}
|
|
_error:
|
|
spin_unlock_irq(&tu->qlock);
|
|
return result > 0 ? result : err;
|
|
}
|
|
|
|
static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
|
|
{
|
|
unsigned int mask;
|
|
struct snd_timer_user *tu;
|
|
|
|
tu = file->private_data;
|
|
|
|
poll_wait(file, &tu->qchange_sleep, wait);
|
|
|
|
mask = 0;
|
|
if (tu->qused)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
if (tu->disconnected)
|
|
mask |= POLLERR;
|
|
|
|
return mask;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
#include "timer_compat.c"
|
|
#else
|
|
#define snd_timer_user_ioctl_compat NULL
|
|
#endif
|
|
|
|
static const 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,
|
|
.llseek = no_llseek,
|
|
.poll = snd_timer_user_poll,
|
|
.unlocked_ioctl = snd_timer_user_ioctl,
|
|
.compat_ioctl = snd_timer_user_ioctl_compat,
|
|
.fasync = snd_timer_user_fasync,
|
|
};
|
|
|
|
/* unregister the system timer */
|
|
static void snd_timer_free_all(void)
|
|
{
|
|
struct snd_timer *timer, *n;
|
|
|
|
list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
|
|
snd_timer_free(timer);
|
|
}
|
|
|
|
static struct device timer_dev;
|
|
|
|
/*
|
|
* ENTRY functions
|
|
*/
|
|
|
|
static int __init alsa_timer_init(void)
|
|
{
|
|
int err;
|
|
|
|
snd_device_initialize(&timer_dev, NULL);
|
|
dev_set_name(&timer_dev, "timer");
|
|
|
|
#ifdef SNDRV_OSS_INFO_DEV_TIMERS
|
|
snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
|
|
"system timer");
|
|
#endif
|
|
|
|
err = snd_timer_register_system();
|
|
if (err < 0) {
|
|
pr_err("ALSA: unable to register system timer (%i)\n", err);
|
|
put_device(&timer_dev);
|
|
return err;
|
|
}
|
|
|
|
err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
|
|
&snd_timer_f_ops, NULL, &timer_dev);
|
|
if (err < 0) {
|
|
pr_err("ALSA: unable to register timer device (%i)\n", err);
|
|
snd_timer_free_all();
|
|
put_device(&timer_dev);
|
|
return err;
|
|
}
|
|
|
|
snd_timer_proc_init();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit alsa_timer_exit(void)
|
|
{
|
|
snd_unregister_device(&timer_dev);
|
|
snd_timer_free_all();
|
|
put_device(&timer_dev);
|
|
snd_timer_proc_done();
|
|
#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_interrupt);
|