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>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 6a2e030c836c..b97c59eab7ab 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -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);