ALSA: Add hrtimer backend for ALSA timer interface

Added the hrtimer backend for ALSA timer interface.
It can be used for the sequencer timer source.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index 66348c92f88d..406a45010985 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -95,6 +95,26 @@ config SND_SEQUENCER_OSS
           this will be compiled as a module. The module will be called
           snd-seq-oss.
 
+config SND_HRTIMER
+        tristate "HR-timer backend support"
+        depends on HIGH_RES_TIMERS
+        select SND_TIMER
+        help
+          Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
+          the hrtimer as a precise timing source. The ALSA sequencer code
+          also can use this timing source.
+
+          To compile this driver as a module, choose M here: the module
+          will be called snd-hrtimer.
+
+config SND_SEQ_HRTIMER_DEFAULT
+        bool "Use HR-timer as default sequencer timer"
+        depends on SND_HRTIMER && SND_SEQUENCER
+        default y
+        help
+          Say Y here to use the HR-timer backend as the default sequencer
+          timer.
+
 config SND_RTCTIMER
         tristate "RTC Timer support"
         depends on RTC
@@ -114,6 +134,7 @@ config SND_RTCTIMER
 config SND_SEQ_RTCTIMER_DEFAULT
         bool "Use RTC as default sequencer timer"
         depends on SND_RTCTIMER && SND_SEQUENCER
+        dpeends on !SND_SEQ_HRTIMER_DEFAULT
         default y
         help
           Say Y here to use the RTC timer as the default sequencer