| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Timers abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/time.h> |
| #include <linux/mutex.h> |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/sched/signal.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> |
| |
| /* internal flags */ |
| #define SNDRV_TIMER_IFLG_PAUSED 0x00010000 |
| #define SNDRV_TIMER_IFLG_DEAD 0x00020000 |
| |
| #if IS_ENABLED(CONFIG_SND_HRTIMER) |
| #define DEFAULT_TIMER_LIMIT 4 |
| #else |
| #define DEFAULT_TIMER_LIMIT 1 |
| #endif |
| |
| static int timer_limit = DEFAULT_TIMER_LIMIT; |
| static int timer_tstamp_monotonic = 1; |
| MODULE_AUTHOR("Jaroslav Kysela <perex@perex.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."); |
| module_param(timer_tstamp_monotonic, int, 0444); |
| MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); |
| |
| MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); |
| MODULE_ALIAS("devname:snd/timer"); |
| |
| enum timer_tread_format { |
| TREAD_FORMAT_NONE = 0, |
| TREAD_FORMAT_TIME64, |
| TREAD_FORMAT_TIME32, |
| }; |
| |
| struct snd_timer_tread32 { |
| int event; |
| s32 tstamp_sec; |
| s32 tstamp_nsec; |
| unsigned int val; |
| }; |
| |
| struct snd_timer_tread64 { |
| int event; |
| u8 pad1[4]; |
| s64 tstamp_sec; |
| s64 tstamp_nsec; |
| unsigned int val; |
| u8 pad2[4]; |
| }; |
| |
| struct snd_timer_user { |
| struct snd_timer_instance *timeri; |
| int tread; /* enhanced read with timestamps and events */ |
| unsigned long ticks; |
| unsigned long overrun; |
| int qhead; |
| int qtail; |
| int qused; |
| int queue_size; |
| bool disconnected; |
| struct snd_timer_read *queue; |
| struct snd_timer_tread64 *tqueue; |
| spinlock_t qlock; |
| unsigned long last_resolution; |
| unsigned int filter; |
| struct timespec64 tstamp; /* trigger tstamp */ |
| wait_queue_head_t qchange_sleep; |
| struct snd_fasync *fasync; |
| struct mutex ioctl_lock; |
| }; |
| |
| struct snd_timer_status32 { |
| s32 tstamp_sec; /* Timestamp - last update */ |
| s32 tstamp_nsec; |
| unsigned int resolution; /* current period resolution in ns */ |
| unsigned int lost; /* counter of master tick lost */ |
| unsigned int overrun; /* count of read queue overruns */ |
| unsigned int queue; /* used queue size */ |
| unsigned char reserved[64]; /* reserved */ |
| }; |
| |
| #define SNDRV_TIMER_IOCTL_STATUS32 _IOR('T', 0x14, struct snd_timer_status32) |
| |
| struct snd_timer_status64 { |
| s64 tstamp_sec; /* Timestamp - last update */ |
| s64 tstamp_nsec; |
| unsigned int resolution; /* current period resolution in ns */ |
| unsigned int lost; /* counter of master tick lost */ |
| unsigned int overrun; /* count of read queue overruns */ |
| unsigned int queue; /* used queue size */ |
| unsigned char reserved[64]; /* reserved */ |
| }; |
| |
| #define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64) |
| |
| /* 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); |
| |
| #define MAX_SLAVE_INSTANCES 1000 |
| static int num_slaves; |
| |
| static DEFINE_MUTEX(register_mutex); |
| |
| static int snd_timer_free(struct snd_timer *timer); |
| static int snd_timer_dev_free(struct snd_device *device); |
| static int snd_timer_dev_register(struct snd_device *device); |
| static int snd_timer_dev_disconnect(struct snd_device *device); |
| |
| static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); |
| |
| /* |
| * create a timer instance with the given owner string. |
| */ |
| struct snd_timer_instance *snd_timer_instance_new(const char *owner) |
| { |
| struct snd_timer_instance *timeri; |
| |
| timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); |
| if (timeri == NULL) |
| return NULL; |
| timeri->owner = kstrdup(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); |
| |
| return timeri; |
| } |
| EXPORT_SYMBOL(snd_timer_instance_new); |
| |
| void snd_timer_instance_free(struct snd_timer_instance *timeri) |
| { |
| if (timeri) { |
| if (timeri->private_free) |
| timeri->private_free(timeri); |
| kfree(timeri->owner); |
| kfree(timeri); |
| } |
| } |
| EXPORT_SYMBOL(snd_timer_instance_free); |
| |
| /* |
| * find a timer instance from the given timer id |
| */ |
| static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) |
| { |
| struct snd_timer *timer; |
| |
| list_for_each_entry(timer, &snd_timer_list, 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_MODULES |
| |
| static void snd_timer_request(struct snd_timer_id *tid) |
| { |
| 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 |
| |
| /* move the slave if it belongs to the master; return 1 if match */ |
| static int check_matching_master_slave(struct snd_timer_instance *master, |
| struct snd_timer_instance *slave) |
| { |
| if (slave->slave_class != master->slave_class || |
| slave->slave_id != master->slave_id) |
| return 0; |
| if (master->timer->num_instances >= master->timer->max_instances) |
| return -EBUSY; |
| list_move_tail(&slave->open_list, &master->slave_list_head); |
| master->timer->num_instances++; |
| guard(spinlock_irq)(&slave_active_lock); |
| guard(spinlock)(&master->timer->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); |
| return 1; |
| } |
| |
| /* |
| * 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 int snd_timer_check_slave(struct snd_timer_instance *slave) |
| { |
| struct snd_timer *timer; |
| struct snd_timer_instance *master; |
| int err = 0; |
| |
| /* FIXME: it's really dumb to look up all entries.. */ |
| list_for_each_entry(timer, &snd_timer_list, device_list) { |
| list_for_each_entry(master, &timer->open_list_head, open_list) { |
| err = check_matching_master_slave(master, slave); |
| if (err != 0) /* match found or error */ |
| goto out; |
| } |
| } |
| out: |
| return err < 0 ? err : 0; |
| } |
| |
| /* |
| * 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 int snd_timer_check_master(struct snd_timer_instance *master) |
| { |
| struct snd_timer_instance *slave, *tmp; |
| int err = 0; |
| |
| /* check all pending slaves */ |
| list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { |
| err = check_matching_master_slave(master, slave); |
| if (err < 0) |
| break; |
| } |
| return err < 0 ? err : 0; |
| } |
| |
| static void snd_timer_close_locked(struct snd_timer_instance *timeri, |
| struct device **card_devp_to_put); |
| |
| /* |
| * open a timer instance |
| * when opening a master, the slave id must be here given. |
| */ |
| int snd_timer_open(struct snd_timer_instance *timeri, |
| struct snd_timer_id *tid, |
| unsigned int slave_id) |
| { |
| struct snd_timer *timer; |
| struct device *card_dev_to_put = NULL; |
| int err; |
| |
| mutex_lock(®ister_mutex); |
| 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) { |
| pr_debug("ALSA: timer: invalid slave class %i\n", |
| tid->dev_sclass); |
| err = -EINVAL; |
| goto unlock; |
| } |
| if (num_slaves >= MAX_SLAVE_INSTANCES) { |
| err = -EBUSY; |
| goto unlock; |
| } |
| 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); |
| num_slaves++; |
| err = snd_timer_check_slave(timeri); |
| goto list_added; |
| } |
| |
| /* open a master instance */ |
| timer = snd_timer_find(tid); |
| #ifdef CONFIG_MODULES |
| if (!timer) { |
| mutex_unlock(®ister_mutex); |
| snd_timer_request(tid); |
| mutex_lock(®ister_mutex); |
| timer = snd_timer_find(tid); |
| } |
| #endif |
| if (!timer) { |
| err = -ENODEV; |
| goto unlock; |
| } |
| if (!list_empty(&timer->open_list_head)) { |
| struct snd_timer_instance *t = |
| list_entry(timer->open_list_head.next, |
| struct snd_timer_instance, open_list); |
| if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { |
| err = -EBUSY; |
| goto unlock; |
| } |
| } |
| if (timer->num_instances >= timer->max_instances) { |
| err = -EBUSY; |
| goto unlock; |
| } |
| if (!try_module_get(timer->module)) { |
| err = -EBUSY; |
| goto unlock; |
| } |
| /* take a card refcount for safe disconnection */ |
| if (timer->card) { |
| get_device(&timer->card->card_dev); |
| card_dev_to_put = &timer->card->card_dev; |
| } |
| |
| if (list_empty(&timer->open_list_head) && timer->hw.open) { |
| err = timer->hw.open(timer); |
| if (err) { |
| module_put(timer->module); |
| goto unlock; |
| } |
| } |
| |
| timeri->timer = timer; |
| timeri->slave_class = tid->dev_sclass; |
| timeri->slave_id = slave_id; |
| |
| list_add_tail(&timeri->open_list, &timer->open_list_head); |
| timer->num_instances++; |
| err = snd_timer_check_master(timeri); |
| list_added: |
| if (err < 0) |
| snd_timer_close_locked(timeri, &card_dev_to_put); |
| |
| unlock: |
| mutex_unlock(®ister_mutex); |
| /* put_device() is called after unlock for avoiding deadlock */ |
| if (err < 0 && card_dev_to_put) |
| put_device(card_dev_to_put); |
| return err; |
| } |
| EXPORT_SYMBOL(snd_timer_open); |
| |
| /* remove slave links, called from snd_timer_close_locked() below */ |
| static void remove_slave_links(struct snd_timer_instance *timeri, |
| struct snd_timer *timer) |
| { |
| struct snd_timer_instance *slave, *tmp; |
| |
| guard(spinlock_irq)(&slave_active_lock); |
| guard(spinlock)(&timer->lock); |
| timeri->timer = NULL; |
| list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, open_list) { |
| list_move_tail(&slave->open_list, &snd_timer_slave_list); |
| timer->num_instances--; |
| slave->master = NULL; |
| slave->timer = NULL; |
| list_del_init(&slave->ack_list); |
| list_del_init(&slave->active_list); |
| } |
| } |
| |
| /* |
| * close a timer instance |
| * call this with register_mutex down. |
| */ |
| static void snd_timer_close_locked(struct snd_timer_instance *timeri, |
| struct device **card_devp_to_put) |
| { |
| struct snd_timer *timer = timeri->timer; |
| |
| if (timer) { |
| guard(spinlock_irq)(&timer->lock); |
| timeri->flags |= SNDRV_TIMER_IFLG_DEAD; |
| } |
| |
| if (!list_empty(&timeri->open_list)) { |
| list_del_init(&timeri->open_list); |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
| num_slaves--; |
| } |
| |
| /* force to stop the timer */ |
| snd_timer_stop(timeri); |
| |
| if (timer) { |
| timer->num_instances--; |
| /* 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); |
| |
| remove_slave_links(timeri, timer); |
| |
| /* slave doesn't need to release timer resources below */ |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
| timer = NULL; |
| } |
| |
| if (timer) { |
| if (list_empty(&timer->open_list_head) && timer->hw.close) |
| timer->hw.close(timer); |
| /* release a card refcount for safe disconnection */ |
| if (timer->card) |
| *card_devp_to_put = &timer->card->card_dev; |
| module_put(timer->module); |
| } |
| } |
| |
| /* |
| * close a timer instance |
| */ |
| void snd_timer_close(struct snd_timer_instance *timeri) |
| { |
| struct device *card_dev_to_put = NULL; |
| |
| if (snd_BUG_ON(!timeri)) |
| return; |
| |
| scoped_guard(mutex, ®ister_mutex) |
| snd_timer_close_locked(timeri, &card_dev_to_put); |
| /* put_device() is called after unlock for avoiding deadlock */ |
| if (card_dev_to_put) |
| put_device(card_dev_to_put); |
| } |
| EXPORT_SYMBOL(snd_timer_close); |
| |
| static unsigned long snd_timer_hw_resolution(struct snd_timer *timer) |
| { |
| if (timer->hw.c_resolution) |
| return timer->hw.c_resolution(timer); |
| else |
| return timer->hw.resolution; |
| } |
| |
| unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) |
| { |
| struct snd_timer * timer; |
| unsigned long ret = 0; |
| |
| if (timeri == NULL) |
| return 0; |
| timer = timeri->timer; |
| if (timer) { |
| guard(spinlock_irqsave)(&timer->lock); |
| ret = snd_timer_hw_resolution(timer); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL(snd_timer_resolution); |
| |
| static void snd_timer_notify1(struct snd_timer_instance *ti, int event) |
| { |
| struct snd_timer *timer = ti->timer; |
| unsigned long resolution = 0; |
| struct snd_timer_instance *ts; |
| struct timespec64 tstamp; |
| |
| if (timer_tstamp_monotonic) |
| ktime_get_ts64(&tstamp); |
| else |
| ktime_get_real_ts64(&tstamp); |
| if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || |
| event > SNDRV_TIMER_EVENT_PAUSE)) |
| return; |
| if (timer && |
| (event == SNDRV_TIMER_EVENT_START || |
| event == SNDRV_TIMER_EVENT_CONTINUE)) |
| resolution = snd_timer_hw_resolution(timer); |
| if (ti->ccallback) |
| ti->ccallback(ti, event, &tstamp, resolution); |
| if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) |
| return; |
| if (timer == NULL) |
| return; |
| if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| return; |
| event += 10; /* convert to SNDRV_TIMER_EVENT_MXXX */ |
| list_for_each_entry(ts, &ti->slave_active_head, active_list) |
| if (ts->ccallback) |
| ts->ccallback(ts, event, &tstamp, resolution); |
| } |
| |
| /* start/continue a master timer */ |
| static int snd_timer_start1(struct snd_timer_instance *timeri, |
| bool start, unsigned long ticks) |
| { |
| struct snd_timer *timer; |
| int result; |
| |
| timer = timeri->timer; |
| if (!timer) |
| return -EINVAL; |
| |
| guard(spinlock_irqsave)(&timer->lock); |
| if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) |
| return -EINVAL; |
| if (timer->card && timer->card->shutdown) |
| return -ENODEV; |
| if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | |
| SNDRV_TIMER_IFLG_START)) |
| return -EBUSY; |
| |
| /* check the actual time for the start tick; |
| * bail out as error if it's way too low (< 100us) |
| */ |
| if (start && !(timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) { |
| if ((u64)snd_timer_hw_resolution(timer) * ticks < 100000) |
| return -EINVAL; |
| } |
| |
| if (start) |
| timeri->ticks = timeri->cticks = ticks; |
| else if (!timeri->cticks) |
| timeri->cticks = 1; |
| timeri->pticks = 0; |
| |
| list_move_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; |
| result = 1; /* delayed start */ |
| } else { |
| if (start) |
| timer->sticks = ticks; |
| timer->hw.start(timer); |
| __start_now: |
| timer->running++; |
| timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| result = 0; |
| } |
| snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : |
| SNDRV_TIMER_EVENT_CONTINUE); |
| return result; |
| } |
| |
| /* start/continue a slave timer */ |
| static int snd_timer_start_slave(struct snd_timer_instance *timeri, |
| bool start) |
| { |
| guard(spinlock_irqsave)(&slave_active_lock); |
| if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) |
| return -EINVAL; |
| if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) |
| return -EBUSY; |
| timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| if (timeri->master && timeri->timer) { |
| guard(spinlock)(&timeri->timer->lock); |
| list_add_tail(&timeri->active_list, |
| &timeri->master->slave_active_head); |
| snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : |
| SNDRV_TIMER_EVENT_CONTINUE); |
| } |
| 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; |
| |
| timer = timeri->timer; |
| if (!timer) |
| return -EINVAL; |
| guard(spinlock_irqsave)(&timer->lock); |
| list_del_init(&timeri->ack_list); |
| list_del_init(&timeri->active_list); |
| if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | |
| SNDRV_TIMER_IFLG_START))) |
| return -EBUSY; |
| if (timer->card && timer->card->shutdown) |
| return 0; |
| 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_PAUSE); |
| return 0; |
| } |
| |
| /* stop/pause a slave timer */ |
| static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) |
| { |
| bool running; |
| |
| guard(spinlock_irqsave)(&slave_active_lock); |
| running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING; |
| timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| if (timeri->timer) { |
| guard(spinlock)(&timeri->timer->lock); |
| list_del_init(&timeri->ack_list); |
| list_del_init(&timeri->active_list); |
| if (running) |
| snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : |
| SNDRV_TIMER_EVENT_PAUSE); |
| } |
| return running ? 0 : -EBUSY; |
| } |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(snd_timer_start); |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(snd_timer_stop); |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(snd_timer_continue); |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(snd_timer_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(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; |
| } |
| |
| /* call callbacks in timer ack list */ |
| static void snd_timer_process_callbacks(struct snd_timer *timer, |
| struct list_head *head) |
| { |
| struct snd_timer_instance *ti; |
| unsigned long resolution, ticks; |
| |
| while (!list_empty(head)) { |
| ti = list_first_entry(head, struct snd_timer_instance, |
| ack_list); |
| |
| /* remove from ack_list and make empty */ |
| list_del_init(&ti->ack_list); |
| |
| if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) { |
| 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; |
| } |
| } |
| } |
| |
| /* clear pending instances from ack list */ |
| static void snd_timer_clear_callbacks(struct snd_timer *timer, |
| struct list_head *head) |
| { |
| guard(spinlock_irqsave)(&timer->lock); |
| while (!list_empty(head)) |
| list_del_init(head->next); |
| } |
| |
| /* |
| * timer work |
| * |
| */ |
| static void snd_timer_work(struct work_struct *work) |
| { |
| struct snd_timer *timer = container_of(work, struct snd_timer, task_work); |
| |
| if (timer->card && timer->card->shutdown) { |
| snd_timer_clear_callbacks(timer, &timer->sack_list_head); |
| return; |
| } |
| |
| guard(spinlock_irqsave)(&timer->lock); |
| snd_timer_process_callbacks(timer, &timer->sack_list_head); |
| } |
| |
| /* |
| * 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; |
| struct list_head *ack_list_head; |
| |
| if (timer == NULL) |
| return; |
| |
| if (timer->card && timer->card->shutdown) { |
| snd_timer_clear_callbacks(timer, &timer->ack_list_head); |
| return; |
| } |
| |
| guard(spinlock_irqsave)(&timer->lock); |
| |
| /* remember the current resolution */ |
| resolution = snd_timer_hw_resolution(timer); |
| |
| /* 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_DEAD) |
| continue; |
| 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_WORK) || |
| (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 */ |
| snd_timer_process_callbacks(timer, &timer->ack_list_head); |
| |
| /* do we have any slow callbacks? */ |
| if (!list_empty(&timer->sack_list_head)) |
| queue_work(system_highpri_wq, &timer->task_work); |
| } |
| EXPORT_SYMBOL(snd_timer_interrupt); |
| |
| /* |
| |
| */ |
| |
| 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 const 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 (tid->dev_class == SNDRV_TIMER_CLASS_CARD || |
| tid->dev_class == SNDRV_TIMER_CLASS_PCM) { |
| if (WARN_ON(!card)) |
| 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) |
| strscpy(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); |
| INIT_WORK(&timer->task_work, snd_timer_work); |
| timer->max_instances = 1000; /* default limit per 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; |
| } |
| EXPORT_SYMBOL(snd_timer_new); |
| |
| static int snd_timer_free(struct snd_timer *timer) |
| { |
| if (!timer) |
| return 0; |
| |
| guard(mutex)(®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); |
| |
| 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; |
| |
| guard(mutex)(®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.. */ |
| return -EBUSY; |
| } |
| list_add_tail(&timer->device_list, &timer1->device_list); |
| return 0; |
| } |
| |
| static int snd_timer_dev_disconnect(struct snd_device *device) |
| { |
| struct snd_timer *timer = device->device_data; |
| struct snd_timer_instance *ti; |
| |
| guard(mutex)(®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); |
| } |
| return 0; |
| } |
| |
| void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp) |
| { |
| 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; |
| guard(spinlock_irqsave)(&timer->lock); |
| if (event == SNDRV_TIMER_EVENT_MSTART || |
| event == SNDRV_TIMER_EVENT_MCONTINUE || |
| event == SNDRV_TIMER_EVENT_MRESUME) |
| resolution = snd_timer_hw_resolution(timer); |
| 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); |
| } |
| } |
| EXPORT_SYMBOL(snd_timer_notify); |
| |
| /* |
| * 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); |
| } |
| EXPORT_SYMBOL(snd_timer_global_new); |
| |
| int snd_timer_global_free(struct snd_timer *timer) |
| { |
| return snd_timer_free(timer); |
| } |
| EXPORT_SYMBOL(snd_timer_global_free); |
| |
| 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); |
| } |
| EXPORT_SYMBOL(snd_timer_global_register); |
| |
| /* |
| * System timer |
| */ |
| |
| struct snd_timer_system_private { |
| struct timer_list tlist; |
| struct snd_timer *snd_timer; |
| unsigned long last_expires; |
| unsigned long last_jiffies; |
| unsigned long correction; |
| }; |
| |
| static void snd_timer_s_function(struct timer_list *t) |
| { |
| struct snd_timer_system_private *priv = from_timer(priv, t, |
| tlist); |
| struct snd_timer *timer = priv->snd_timer; |
| 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 const struct snd_timer_hardware snd_timer_system = |
| { |
| .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_WORK, |
| .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; |
| } |
| priv->snd_timer = timer; |
| timer_setup(&priv->tlist, snd_timer_s_function, 0); |
| 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; |
| unsigned long resolution; |
| |
| guard(mutex)(®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); |
| scoped_guard(spinlock_irq, &timer->lock) |
| resolution = snd_timer_hw_resolution(timer); |
| if (resolution) |
| snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", |
| resolution / 1000, |
| 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"); |
| } |
| } |
| |
| 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; |
| |
| guard(spinlock)(&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: |
| snd_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_tread64 *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 timespec64 *tstamp, |
| unsigned long resolution) |
| { |
| struct snd_timer_user *tu = timeri->callback_data; |
| struct snd_timer_tread64 r1; |
| |
| 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_sec = tstamp->tv_sec; |
| r1.tstamp_nsec = tstamp->tv_nsec; |
| r1.val = resolution; |
| scoped_guard(spinlock_irqsave, &tu->qlock) |
| snd_timer_user_append_to_tqueue(tu, &r1); |
| snd_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_tread64 *r, r1; |
| struct timespec64 tstamp; |
| int prev, append = 0; |
| |
| memset(&r1, 0, sizeof(r1)); |
| memset(&tstamp, 0, sizeof(tstamp)); |
| scoped_guard(spinlock, &tu->qlock) { |
| if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | |
| (1 << SNDRV_TIMER_EVENT_TICK))) == 0) |
| return; |
| if (tu->last_resolution != resolution || ticks > 0) { |
| if (timer_tstamp_monotonic) |
| ktime_get_ts64(&tstamp); |
| else |
| ktime_get_real_ts64(&tstamp); |
| } |
| if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && |
| tu->last_resolution != resolution) { |
| r1.event = SNDRV_TIMER_EVENT_RESOLUTION; |
| r1.tstamp_sec = tstamp.tv_sec; |
| r1.tstamp_nsec = tstamp.tv_nsec; |
| 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) |
| break; |
| if (ticks == 0) |
| break; |
| 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_sec = tstamp.tv_sec; |
| r->tstamp_nsec = tstamp.tv_nsec; |
| r->val += ticks; |
| append++; |
| break; |
| } |
| } |
| r1.event = SNDRV_TIMER_EVENT_TICK; |
| r1.tstamp_sec = tstamp.tv_sec; |
| r1.tstamp_nsec = tstamp.tv_nsec; |
| r1.val = ticks; |
| snd_timer_user_append_to_tqueue(tu, &r1); |
| append++; |
| } |
| if (append == 0) |
| return; |
| snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); |
| wake_up(&tu->qchange_sleep); |
| } |
| |
| static int realloc_user_queue(struct snd_timer_user *tu, int size) |
| { |
| struct snd_timer_read *queue = NULL; |
| struct snd_timer_tread64 *tqueue = NULL; |
| |
| if (tu->tread) { |
| tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); |
| if (!tqueue) |
| return -ENOMEM; |
| } else { |
| queue = kcalloc(size, sizeof(*queue), GFP_KERNEL); |
| if (!queue) |
| return -ENOMEM; |
| } |
| |
| guard(spinlock_irq)(&tu->qlock); |
| kfree(tu->queue); |
| kfree(tu->tqueue); |
| tu->queue_size = size; |
| tu->queue = queue; |
| tu->tqueue = tqueue; |
| tu->qhead = tu->qtail = tu->qused = 0; |
| |
| return 0; |
| } |
| |
| static int snd_timer_user_open(struct inode *inode, struct file *file) |
| { |
| struct snd_timer_user *tu; |
| int err; |
| |
| err = stream_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; |
| if (realloc_user_queue(tu, 128) < 0) { |
| 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; |
| scoped_guard(mutex, &tu->ioctl_lock) { |
| if (tu->timeri) { |
| snd_timer_close(tu->timeri); |
| snd_timer_instance_free(tu->timeri); |
| } |
| } |
| snd_fasync_free(tu->fasync); |
| 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; |
| guard(mutex)(®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.device < 0) { |
| id.device = 0; |
| } else { |
| if (id.subdevice < 0) |
| id.subdevice = 0; |
| else if (id.subdevice < INT_MAX) |
| 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); |
| } |
| } |
| 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 __free(kfree) = NULL; |
| struct snd_timer_id tid; |
| struct snd_timer *t; |
| struct list_head *p; |
| |
| ginfo = memdup_user(_ginfo, sizeof(*ginfo)); |
| if (IS_ERR(ginfo)) |
| return PTR_ERR(no_free_ptr(ginfo)); |
| |
| tid = ginfo->tid; |
| memset(ginfo, 0, sizeof(*ginfo)); |
| ginfo->tid = tid; |
| guard(mutex)(®ister_mutex); |
| t = snd_timer_find(&tid); |
| if (!t) |
| return -ENODEV; |
| ginfo->card = t->card ? t->card->number : -1; |
| if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; |
| strscpy(ginfo->id, t->id, sizeof(ginfo->id)); |
| strscpy(ginfo->name, t->name, sizeof(ginfo->name)); |
| scoped_guard(spinlock_irq, &t->lock) |
| ginfo->resolution = snd_timer_hw_resolution(t); |
| 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++; |
| } |
| if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int timer_set_gparams(struct snd_timer_gparams *gparams) |
| { |
| struct snd_timer *t; |
| |
| guard(mutex)(®ister_mutex); |
| t = snd_timer_find(&gparams->tid); |
| if (!t) |
| return -ENODEV; |
| if (!list_empty(&t->open_list_head)) |
| return -EBUSY; |
| if (!t->hw.set_period) |
| return -ENOSYS; |
| return t->hw.set_period(t, gparams->period_num, gparams->period_den); |
| } |
| |
| 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; |
| guard(mutex)(®ister_mutex); |
| t = snd_timer_find(&tid); |
| if (t != NULL) { |
| guard(spinlock_irq)(&t->lock); |
| gstatus.resolution = snd_timer_hw_resolution(t); |
| 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; |
| } |
| 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); |
| snd_timer_instance_free(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; |
| tu->timeri = snd_timer_instance_new(str); |
| if (!tu->timeri) { |
| err = -ENOMEM; |
| goto __err; |
| } |
| |
| 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 = snd_timer_open(tu->timeri, &tselect.id, current->pid); |
| if (err < 0) { |
| snd_timer_instance_free(tu->timeri); |
| tu->timeri = NULL; |
| } |
| |
| __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 __free(kfree) = NULL; |
| struct snd_timer *t; |
| |
| 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; |
| strscpy(info->id, t->id, sizeof(info->id)); |
| strscpy(info->name, t->name, sizeof(info->name)); |
| scoped_guard(spinlock_irq, &t->lock) |
| info->resolution = snd_timer_hw_resolution(t); |
| if (copy_to_user(_info, info, sizeof(*_info))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| 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; |
| 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); |
| scoped_guard(spinlock_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; |
| } |
| if (params.queue_size > 0 && |
| (unsigned int)tu->queue_size != params.queue_size) { |
| err = realloc_user_queue(tu, params.queue_size); |
| if (err < 0) |
| goto _end; |
| } |
| scoped_guard(spinlock_irq, &tu->qlock) { |
| tu->qhead = tu->qtail = tu->qused = 0; |
| if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { |
| if (tu->tread) { |
| struct snd_timer_tread64 tread; |
| |
| memset(&tread, 0, sizeof(tread)); |
| tread.event = SNDRV_TIMER_EVENT_EARLY; |
| tread.tstamp_sec = 0; |
| tread.tstamp_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_status32(struct file *file, |
| struct snd_timer_status32 __user *_status) |
| { |
| struct snd_timer_user *tu; |
| struct snd_timer_status32 status; |
| |
| tu = file->private_data; |
| if (!tu->timeri) |
| return -EBADFD; |
| memset(&status, 0, sizeof(status)); |
| status.tstamp_sec = tu->tstamp.tv_sec; |
| status.tstamp_nsec = tu->tstamp.tv_nsec; |
| status.resolution = snd_timer_resolution(tu->timeri); |
| status.lost = tu->timeri->lost; |
| status.overrun = tu->overrun; |
| scoped_guard(spinlock_irq, &tu->qlock) |
| status.queue = tu->qused; |
| if (copy_to_user(_status, &status, sizeof(status))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int snd_timer_user_status64(struct file *file, |
| struct snd_timer_status64 __user *_status) |
| { |
| struct snd_timer_user *tu; |
| struct snd_timer_status64 status; |
| |
| tu = file->private_data; |
| if (!tu->timeri) |
| return -EBADFD; |
| memset(&status, 0, sizeof(status)); |
| status.tstamp_sec = tu->tstamp.tv_sec; |
| status.tstamp_nsec = tu->tstamp.tv_nsec; |
| status.resolution = snd_timer_resolution(tu->timeri); |
| status.lost = tu->timeri->lost; |
| status.overrun = tu->overrun; |
| scoped_guard(spinlock_irq, &tu->qlock) |
| status.queue = tu->qused; |
| 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; |
| err = snd_timer_start(tu->timeri, tu->ticks); |
| if (err < 0) |
| return err; |
| return 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; |
| err = snd_timer_stop(tu->timeri); |
| if (err < 0) |
| return err; |
| return 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; |
| err = snd_timer_continue(tu->timeri); |
| if (err < 0) |
| return err; |
| return 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; |
| err = snd_timer_pause(tu->timeri); |
| if (err < 0) |
| return err; |
| return 0; |
| } |
| |
| static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu, |
| unsigned int cmd, bool compat) |
| { |
| int __user *p = argp; |
| int xarg, old_tread; |
| |
| if (tu->timeri) /* too late */ |
| return -EBUSY; |
| if (get_user(xarg, p)) |
| return -EFAULT; |
| |
| old_tread = tu->tread; |
| |
| if (!xarg) |
| tu->tread = TREAD_FORMAT_NONE; |
| else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 || |
| (IS_ENABLED(CONFIG_64BIT) && !compat)) |
| tu->tread = TREAD_FORMAT_TIME64; |
| else |
| tu->tread = TREAD_FORMAT_TIME32; |
| |
| if (tu->tread != old_tread && |
| realloc_user_queue(tu, tu->queue_size) < 0) { |
| tu->tread = old_tread; |
| return -ENOMEM; |
| } |
| |
| return 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, bool compat) |
| { |
| 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_OLD: |
| case SNDRV_TIMER_IOCTL_TREAD64: |
| return snd_timer_user_tread(argp, tu, cmd, compat); |
| 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_STATUS32: |
| return snd_timer_user_status32(file, argp); |
| case SNDRV_TIMER_IOCTL_STATUS64: |
| return snd_timer_user_status64(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; |
| |
| guard(mutex)(&tu->ioctl_lock); |
| return __snd_timer_user_ioctl(file, cmd, arg, false); |
| } |
| |
| static int snd_timer_user_fasync(int fd, struct file * file, int on) |
| { |
| struct snd_timer_user *tu; |
| |
| tu = file->private_data; |
| return snd_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_tread64 *tread; |
| struct snd_timer_tread32 tread32; |
| struct snd_timer_user *tu; |
| long result = 0, unit; |
| int qhead; |
| int err = 0; |
| |
| tu = file->private_data; |
| switch (tu->tread) { |
| case TREAD_FORMAT_TIME64: |
| unit = sizeof(struct snd_timer_tread64); |
| break; |
| case TREAD_FORMAT_TIME32: |
| unit = sizeof(struct snd_timer_tread32); |
| break; |
| case TREAD_FORMAT_NONE: |
| unit = sizeof(struct snd_timer_read); |
| break; |
| default: |
| WARN_ONCE(1, "Corrupt snd_timer_user\n"); |
| return -ENOTSUPP; |
| } |
| |
| mutex_lock(&tu->ioctl_lock); |
| spin_lock_irq(&tu->qlock); |
| while ((long)count - result >= unit) { |
| while (!tu->qused) { |
| wait_queue_entry_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); |
| mutex_unlock(&tu->ioctl_lock); |
| schedule(); |
| mutex_lock(&tu->ioctl_lock); |
| 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); |
| |
| tread = &tu->tqueue[qhead]; |
| |
| switch (tu->tread) { |
| case TREAD_FORMAT_TIME64: |
| if (copy_to_user(buffer, tread, |
| sizeof(struct snd_timer_tread64))) |
| err = -EFAULT; |
| break; |
| case TREAD_FORMAT_TIME32: |
| memset(&tread32, 0, sizeof(tread32)); |
| tread32 = (struct snd_timer_tread32) { |
| .event = tread->event, |
| .tstamp_sec = tread->tstamp_sec, |
| .tstamp_nsec = tread->tstamp_nsec, |
| .val = tread->val, |
| }; |
| |
| if (copy_to_user(buffer, &tread32, sizeof(tread32))) |
| err = -EFAULT; |
| break; |
| case TREAD_FORMAT_NONE: |
| if (copy_to_user(buffer, &tu->queue[qhead], |
| sizeof(struct snd_timer_read))) |
| err = -EFAULT; |
| break; |
| default: |
| err = -ENOTSUPP; |
| break; |
| } |
| |
| spin_lock_irq(&tu->qlock); |
| if (err < 0) |
| goto _error; |
| result += unit; |
| buffer += unit; |
| } |
| _error: |
| spin_unlock_irq(&tu->qlock); |
| mutex_unlock(&tu->ioctl_lock); |
| return result > 0 ? result : err; |
| } |
| |
| static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) |
| { |
| __poll_t mask; |
| struct snd_timer_user *tu; |
| |
| tu = file->private_data; |
| |
| poll_wait(file, &tu->qchange_sleep, wait); |
| |
| mask = 0; |
| guard(spinlock_irq)(&tu->qlock); |
| if (tu->qused) |
| mask |= EPOLLIN | EPOLLRDNORM; |
| if (tu->disconnected) |
| mask |= EPOLLERR; |
| |
| 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; |
| |
| err = snd_device_alloc(&timer_dev, NULL); |
| if (err < 0) |
| return err; |
| 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); |
| goto put_timer; |
| } |
| |
| 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(); |
| goto put_timer; |
| } |
| |
| snd_timer_proc_init(); |
| return 0; |
| |
| put_timer: |
| put_device(timer_dev); |
| return err; |
| } |
| |
| 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) |