diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-01-26 18:00:42 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-01-26 18:40:55 +0000 |
| commit | d7b3557077ee1620fbc290e5577bbb7d65063ab1 (patch) | |
| tree | 00e036690d821bad988111df11296a47c9e84603 /sound/soc/codecs/wm8996.c | |
| parent | 62c1c40127e351de7fbc1d8c782f7508f8314aab (diff) | |
ASoC: wm8996: Handle failures to determine accessory polarity
If we get an indeterminate impedance with both headset polarities then
give up and report the accessory as a headphone rather than continually
retrying.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/wm8996.c')
| -rw-r--r-- | sound/soc/codecs/wm8996.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/sound/soc/codecs/wm8996.c b/sound/soc/codecs/wm8996.c index 8e8f8d1fef91..cde11ca9d9e4 100644 --- a/sound/soc/codecs/wm8996.c +++ b/sound/soc/codecs/wm8996.c @@ -90,6 +90,7 @@ struct wm8996_priv { struct snd_soc_jack *jack; bool detecting; bool jack_mic; + int jack_flips; wm8996_polarity_fn polarity_cb; #ifdef CONFIG_GPIOLIB @@ -2437,6 +2438,7 @@ int wm8996_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack, wm8996->jack = jack; wm8996->detecting = true; wm8996->polarity_cb = polarity_cb; + wm8996->jack_flips = 0; if (wm8996->polarity_cb) wm8996->polarity_cb(codec, 0); @@ -2552,6 +2554,19 @@ static void wm8996_hpdet_start(struct snd_soc_codec *codec) WM8996_HP_POLL, WM8996_HP_POLL); } +static void wm8996_report_headphone(struct snd_soc_codec *codec) +{ + dev_dbg(codec->dev, "Headphone detected\n"); + wm8996_hpdet_start(codec); + + /* Increase the detection rate a bit for responsiveness. */ + snd_soc_update_bits(codec, WM8996_MIC_DETECT_1, + WM8996_MICD_RATE_MASK | + WM8996_MICD_BIAS_STARTTIME_MASK, + 7 << WM8996_MICD_RATE_SHIFT | + 7 << WM8996_MICD_BIAS_STARTTIME_SHIFT); +} + static void wm8996_micd(struct snd_soc_codec *codec) { struct wm8996_priv *wm8996 = snd_soc_codec_get_drvdata(codec); @@ -2571,6 +2586,7 @@ static void wm8996_micd(struct snd_soc_codec *codec) dev_dbg(codec->dev, "Jack removal detected\n"); wm8996->jack_mic = false; wm8996->detecting = true; + wm8996->jack_flips = 0; snd_soc_jack_report(wm8996->jack, 0, SND_JACK_LINEOUT | SND_JACK_HEADSET | SND_JACK_BTN_0); @@ -2611,9 +2627,17 @@ static void wm8996_micd(struct snd_soc_codec *codec) /* If we detected a lower impedence during initial startup * then we probably have the wrong polarity, flip it. Don't * do this for the lowest impedences to speed up detection of - * plain headphones. + * plain headphones. If both polarities report a low + * impedence then give up and report headphones. */ if (wm8996->detecting && (val & 0x3f0)) { + wm8996->jack_flips++; + + if (wm8996->jack_flips > 1) { + wm8996_report_headphone(codec); + return; + } + reg = snd_soc_read(codec, WM8996_ACCESSORY_DETECT_MODE_2); reg ^= WM8996_HPOUT1FB_SRC | WM8996_MICD_SRC | WM8996_MICD_BIAS_SRC; @@ -2640,17 +2664,7 @@ static void wm8996_micd(struct snd_soc_codec *codec) snd_soc_jack_report(wm8996->jack, SND_JACK_BTN_0, SND_JACK_BTN_0); } else if (wm8996->detecting) { - dev_dbg(codec->dev, "Headphone detected\n"); - wm8996_hpdet_start(codec); - - /* Increase the detection rate a bit for - * responsiveness. - */ - snd_soc_update_bits(codec, WM8996_MIC_DETECT_1, - WM8996_MICD_RATE_MASK | - WM8996_MICD_BIAS_STARTTIME_MASK, - 7 << WM8996_MICD_RATE_SHIFT | - 7 << WM8996_MICD_BIAS_STARTTIME_SHIFT); + wm8996_report_headphone(codec); } } } |