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| author | Mengdong Lin <mengdong.lin@intel.com> | 2015-04-29 11:43:20 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-04-29 12:27:52 +0200 |
| commit | a5e7e07c264bb76d0b7c782766989c491833de05 (patch) | |
| tree | 35cd2d573347f42a479f65079d17cb9562fd3f4d /sound/hda/hdac_device.c | |
| parent | ALSA: hda - implement a refcount for i915 power well switch (diff) | |
| download | linux-a5e7e07c264bb76d0b7c782766989c491833de05.tar.xz linux-a5e7e07c264bb76d0b7c782766989c491833de05.zip | |
ALSA: hda - allow a codec to control the link power
A flag "link_power_control" is added to indicate whether a codec needs to
control the link power. And a new bus ops link_power() is defined for the
codec to request to enable/disable the link power.
Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/hdac_device.c')
| -rw-r--r-- | sound/hda/hdac_device.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c index 55c7d086b9dd..cdee7103f649 100644 --- a/sound/hda/hdac_device.c +++ b/sound/hda/hdac_device.c @@ -552,6 +552,21 @@ void snd_hdac_power_down_pm(struct hdac_device *codec) EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm); #endif +/* + * Enable/disable the link power for a codec. + */ +int snd_hdac_link_power(struct hdac_device *codec, bool enable) +{ + if (!codec->link_power_control) + return 0; + + if (codec->bus->ops->link_power) + return codec->bus->ops->link_power(codec->bus, enable); + else + return -EINVAL; +} +EXPORT_SYMBOL_GPL(snd_hdac_link_power); + /* codec vendor labels */ struct hda_vendor_id { unsigned int id; |