ALSA: ac97: Implement channel map workaround for ALC650

ALC650 has a channel swap option between surround and CLFE channels,
so we need to tweak the channel maps dynamically depending on the
register bit.

Now struct snd_ac97 can contain chmap pointers for playback and
capture.  The driver may store these and let ac97 driver changing the
channel mapping dynamically.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 02cbb50225bb..4458b87649ff 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -422,6 +422,7 @@
  */
 
 struct snd_ac97;
+struct snd_pcm_chmap;
 
 struct snd_ac97_build_ops {
         int (*build_3d) (struct snd_ac97 *ac97);
@@ -528,6 +529,8 @@ struct snd_ac97 {
         struct delayed_work power_work;
 #endif
         struct device dev;
+
+        struct snd_pcm_chmap *chmaps[2]; /* channel-maps (optional) */
 };
 
 #define to_ac97_t(d) container_of(d, struct snd_ac97, dev)