*
*/
-#include <sound/driver.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#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).");
struct snd_timer_user {
struct snd_timer_instance *timeri;
return NULL;
}
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
static void snd_timer_request(struct snd_timer_id *tid)
{
- if (! current->fs->root)
- return;
switch (tid->dev_class) {
case SNDRV_TIMER_CLASS_GLOBAL:
if (tid->device < timer_limit)
/* open a master instance */
mutex_lock(®ister_mutex);
timer = snd_timer_find(tid);
-#ifdef CONFIG_KMOD
- if (timer == NULL) {
+#ifdef CONFIG_MODULES
+ if (!timer) {
mutex_unlock(®ister_mutex);
snd_timer_request(tid);
mutex_lock(®ister_mutex);
struct snd_timer_instance *ts;
struct timespec tstamp;
- getnstimeofday(&tstamp);
+ if (timer_tstamp_monotonic)
+ do_posix_clock_monotonic_gettime(&tstamp);
+ else
+ getnstimeofday(&tstamp);
snd_assert(event >= SNDRV_TIMER_EVENT_START &&
event <= SNDRV_TIMER_EVENT_PAUSE, return);
if (event == SNDRV_TIMER_EVENT_START ||
spin_unlock(&tu->qlock);
return;
}
- if (tu->last_resolution != resolution || ticks > 0)
- getnstimeofday(&tstamp);
+ if (tu->last_resolution != resolution || ticks > 0) {
+ if (timer_tstamp_monotonic)
+ do_posix_clock_monotonic_gettime(&tstamp);
+ else
+ getnstimeofday(&tstamp);
+ }
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
tu->last_resolution != resolution) {
r1.event = SNDRV_TIMER_EVENT_RESOLUTION;