[alsa-devel] [PATCH 6/31] HDA patch_via.c: Add low current mode for power saving.

[Li Bo]

[ALSA] HDA VIA: Add low current mode for power saving.

For VT1708B, VT1708S and VT1702, enter low current mode if no analog
stream is opened and all aa path mute.

Signed-off-by: Lydia Wang <lydiawang at viatech.com.cn>

---
 sound/pci/hda/patch_via.c |   41 +++++++++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 6 deletions(-)

--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -783,6 +783,10 @@
 				 struct snd_pcm_substream *substream)
 {
 	struct via_spec *spec = codec->spec;
+	int idle = substream->pstr->substream_opened == 1
+		&& substream->ref_count == 0;
+
+	analog_low_current_mode(codec, idle);
 	return snd_hda_multi_out_analog_open(codec, &spec->multiout, substream,
 					     hinfo);
 }
@@ -1089,6 +1093,11 @@
 		if (err < 0)
 			return err;
 	}
+
+	/* init power states */
+	set_jack_power_state(codec);
+	analog_low_current_mode(codec, 1);
+
 	via_free_kctls(codec); /* no longer needed */
 	return 0;
 }
@@ -2312,6 +2321,17 @@
 	{ }
 };

+static int via_pcm_open_close(struct hda_pcm_stream *hinfo,
+			      struct hda_codec *codec,
+			      struct snd_pcm_substream *substream)
+{
+	int idle = substream->pstr->substream_opened == 1
+		&& substream->ref_count == 0;
+
+	analog_low_current_mode(codec, idle);
+	return 0;
+}
+
 static struct hda_pcm_stream vt1708B_8ch_pcm_analog_playback = {
 	.substreams = 2,
 	.channels_min = 2,
@@ -2320,7 +2340,8 @@
 	.ops = {
 		.open = via_playback_pcm_open,
 		.prepare = via_playback_multi_pcm_prepare,
-		.cleanup = via_playback_multi_pcm_cleanup
+		.cleanup = via_playback_multi_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };

@@ -2342,8 +2363,10 @@
 	.channels_max = 2,
 	.nid = 0x13, /* NID to query formats and rates */
 	.ops = {
+		.open = via_pcm_open_close,
 		.prepare = via_capture_pcm_prepare,
-		.cleanup = via_capture_pcm_cleanup
+		.cleanup = via_capture_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };

@@ -2800,7 +2823,8 @@
 	.ops = {
 		.open = via_playback_pcm_open,
 		.prepare = via_playback_pcm_prepare,
-		.cleanup = via_playback_pcm_cleanup
+		.cleanup = via_playback_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };

@@ -2810,8 +2834,10 @@
 	.channels_max = 2,
 	.nid = 0x13, /* NID to query formats and rates */
 	.ops = {
+		.open = via_pcm_open_close,
 		.prepare = via_capture_pcm_prepare,
-		.cleanup = via_capture_pcm_cleanup
+		.cleanup = via_capture_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };

@@ -3236,7 +3262,8 @@
 	.ops = {
 		.open = via_playback_pcm_open,
 		.prepare = via_playback_multi_pcm_prepare,
-		.cleanup = via_playback_multi_pcm_cleanup
+		.cleanup = via_playback_multi_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };

@@ -3246,8 +3273,10 @@
 	.channels_max = 2,
 	.nid = 0x12, /* NID to query formats and rates */
 	.ops = {
+		.open = via_pcm_open_close,
 		.prepare = via_capture_pcm_prepare,
-		.cleanup = via_capture_pcm_cleanup
+		.cleanup = via_capture_pcm_cleanup,
+		.close = via_pcm_open_close
 	},
 };