ASoC: Put WM8958 and WM1811 MICBIAS into bypass mode when no audio
authorMark Brown <broonie@opensource.wolfsonmicro.com>
Tue, 29 Nov 2011 19:58:19 +0000 (19:58 +0000)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Tue, 29 Nov 2011 19:59:18 +0000 (19:59 +0000)
When we don't have any active audio we can put the microphone biases into
bypass mode to save power at the expense of performance.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
sound/soc/codecs/wm8994.c

index 0a16de743dd8dff9c8e095f50936bbe165d48589..207bccd156f1a1cdda4e3a9f49a0b697cc13658f 100644 (file)
@@ -2025,6 +2025,18 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                break;
 
        case SND_SOC_BIAS_PREPARE:
+               /* MICBIAS into regulating mode */
+               switch (control->type) {
+               case WM8958:
+               case WM1811:
+                       snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                           WM8958_MICB1_MODE, 0);
+                       snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                           WM8958_MICB2_MODE, 0);
+                       break;
+               default:
+                       break;
+               }
                break;
 
        case SND_SOC_BIAS_STANDBY:
@@ -2077,7 +2089,20 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                                            WM8994_LINEOUT2_DISCH);
                }
 
-
+               /* MICBIAS into bypass mode on newer devices */
+               switch (control->type) {
+               case WM8958:
+               case WM1811:
+                       snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                           WM8958_MICB1_MODE,
+                                           WM8958_MICB1_MODE);
+                       snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                           WM8958_MICB2_MODE,
+                                           WM8958_MICB2_MODE);
+                       break;
+               default:
+                       break;
+               }
                break;
 
        case SND_SOC_BIAS_OFF:
@@ -3371,6 +3396,19 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
                break;
        }
 
+       /* Put MICBIAS into bypass mode by default on newer devices */
+       switch (control->type) {
+       case WM8958:
+       case WM1811:
+               snd_soc_update_bits(codec, WM8958_MICBIAS1,
+                                   WM8958_MICB1_MODE, WM8958_MICB1_MODE);
+               snd_soc_update_bits(codec, WM8958_MICBIAS2,
+                                   WM8958_MICB2_MODE, WM8958_MICB2_MODE);
+               break;
+       default:
+               break;
+       }
+
        wm8994_update_class_w(codec);
 
        wm8994_handle_pdata(wm8994);