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ALSA: hda - allow a codec to control the link power

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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 <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Mengdong Lin 2015-04-29 17:43:20 +08:00 • committed by Takashi Iwai
commit a5e7e07c26
3 changed files with 23 additions and 0 deletions
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4
include/sound/hdaudio.h
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@ -74,6 +74,7 @@ struct hdac_device {
/* misc flags */
atomic_t in_pm; /* suspend/resume being performed */
bool link_power_control:1;
/* sysfs */
struct hdac_widget_tree *widgets;
@ -184,6 +185,8 @@ struct hdac_bus_ops {
/* get a response from the last command */
int (*get_response)(struct hdac_bus *bus, unsigned int addr,
unsigned int *res);
/* control the link power */
int (*link_power)(struct hdac_bus *bus, bool enable);
};
/*
@ -311,6 +314,7 @@ static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res);
int snd_hdac_link_power(struct hdac_device *codec, bool enable);
bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
void snd_hdac_bus_stop_chip(struct hdac_bus *bus);