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ASoC: wm8994: Actively discharge idle MICBIAS with jack detect 

This minimises the chance of any external capacitors that are fitted
being discharged into headphones as they insert.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-02-21 13:45:53 +00:00
parent 29fdc3605c
commit 55a2778685
1 changed files with 9 additions and 0 deletions
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9
sound/soc/codecs/wm8994.c
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@ -3224,6 +3224,9 @@ static irqreturn_t wm1811_jackdet_irq(int irq, void *data)
snd_soc_jack_report(wm8994->micdet[0].jack,
SND_JACK_MECHANICAL, SND_JACK_MECHANICAL);
snd_soc_update_bits(codec, WM8958_MICBIAS2,
WM8958_MICB2_DISCH, 0);
/*
* Start off measument of microphone impedence to find
* out what's actually there.
@ -3235,6 +3238,9 @@ static irqreturn_t wm1811_jackdet_irq(int irq, void *data)
} else {
dev_dbg(codec->dev, "Jack not detected\n");
snd_soc_update_bits(codec, WM8958_MICBIAS2,
WM8958_MICB2_DISCH, WM8958_MICB2_DISCH);
snd_soc_jack_report(wm8994->micdet[0].jack, 0,
SND_JACK_MECHANICAL | SND_JACK_HEADSET |
wm8994->btn_mask);
@ -3320,6 +3326,9 @@ int wm8958_mic_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack,
* otherwise jump straight to microphone detection.
*/
if (wm8994->jackdet) {
snd_soc_update_bits(codec, WM8958_MICBIAS2,
WM8958_MICB2_DISCH,
WM8958_MICB2_DISCH);
snd_soc_update_bits(codec, WM8994_LDO_1,
WM8994_LDO1_DISCH, 0);
wm1811_jackdet_set_mode(codec,