diff options
Diffstat (limited to 'sound/soc/codecs/wm8903.c')
| -rw-r--r-- | sound/soc/codecs/wm8903.c | 106 |
1 files changed, 103 insertions, 3 deletions
diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c index 7aa2adbe6fb..b5427b47d6f 100644 --- a/sound/soc/codecs/wm8903.c +++ b/sound/soc/codecs/wm8903.c @@ -23,6 +23,7 @@ #include <linux/i2c.h> #include <linux/platform_device.h> #include <sound/core.h> +#include <sound/jack.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/tlv.h> @@ -223,6 +224,12 @@ struct wm8903_priv { struct completion wseq; + struct snd_soc_jack *mic_jack; + int mic_det; + int mic_short; + int mic_last_report; + int mic_delay; + struct snd_pcm_substream *master_substream; struct snd_pcm_substream *slave_substream; }; @@ -1437,19 +1444,112 @@ static int wm8903_hw_params(struct snd_pcm_substream *substream, return 0; } +/** + * wm8903_mic_detect - Enable microphone detection via the WM8903 IRQ + * + * @codec: WM8903 codec + * @jack: jack to report detection events on + * @det: value to report for presence detection + * @shrt: value to report for short detection + * + * Enable microphone detection via IRQ on the WM8903. If GPIOs are + * being used to bring out signals to the processor then only platform + * data configuration is needed for WM8903 and processor GPIOs should + * be configured using snd_soc_jack_add_gpios() instead. + * + * The current threasholds for detection should be configured using + * micdet_cfg in the platform data. Using this function will force on + * the microphone bias for the device. + */ +int wm8903_mic_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack, + int det, int shrt) +{ + struct wm8903_priv *wm8903 = codec->private_data; + int irq_mask = 0; + + dev_dbg(codec->dev, "Enabling microphone detection: %x %x\n", + det, shrt); + + /* Store the configuration */ + wm8903->mic_jack = jack; + wm8903->mic_det = det; + wm8903->mic_short = shrt; + + /* Enable interrupts we've got a report configured for */ + if (det) + irq_mask &= ~WM8903_MICDET_EINT; + if (shrt) + irq_mask &= ~WM8903_MICSHRT_EINT; + + snd_soc_update_bits(codec, WM8903_INTERRUPT_STATUS_1_MASK, + WM8903_MICDET_EINT | WM8903_MICSHRT_EINT, + irq_mask); + + /* Enable mic detection, this may not have been set through + * platform data (eg, if the defaults are OK). */ + snd_soc_update_bits(codec, WM8903_WRITE_SEQUENCER_0, + WM8903_WSEQ_ENA, WM8903_WSEQ_ENA); + snd_soc_update_bits(codec, WM8903_MIC_BIAS_CONTROL_0, + WM8903_MICDET_ENA, WM8903_MICDET_ENA); + + /* Force the microphone bias on; this will trigger an initial + * detection. */ + snd_soc_dapm_force_enable_pin(codec, "Mic Bias"); + + return 0; +} +EXPORT_SYMBOL_GPL(wm8903_mic_detect); + static irqreturn_t wm8903_irq(int irq, void *data) { struct wm8903_priv *wm8903 = data; struct snd_soc_codec *codec = &wm8903->codec; - int reg; + int mic_report; + int int_pol; + int int_val = 0; + int mask = ~snd_soc_read(codec, WM8903_INTERRUPT_STATUS_1_MASK); - reg = snd_soc_read(codec, WM8903_INTERRUPT_STATUS_1); + int_val = snd_soc_read(codec, WM8903_INTERRUPT_STATUS_1) & mask; - if (reg & WM8903_WSEQ_BUSY_EINT) { + if (int_val & WM8903_WSEQ_BUSY_EINT) { dev_dbg(codec->dev, "Write sequencer done\n"); complete(&wm8903->wseq); } + /* + * The rest is microphone jack detection. We need to manually + * invert the polarity of the interrupt after each event - to + * simplify the code keep track of the last state we reported + * and just invert the relevant bits in both the report and + * the polarity register. + */ + mic_report = wm8903->mic_last_report; + int_pol = snd_soc_read(codec, WM8903_INTERRUPT_POLARITY_1); + + if (int_val & WM8903_MICSHRT_EINT) { + dev_dbg(codec->dev, "Microphone short (pol=%x)\n", int_pol); + + mic_report ^= wm8903->mic_short; + int_pol ^= WM8903_MICSHRT_INV; + } + + if (int_val & WM8903_MICDET_EINT) { + dev_dbg(codec->dev, "Microphone detect (pol=%x)\n", int_pol); + + mic_report ^= wm8903->mic_det; + int_pol ^= WM8903_MICDET_INV; + + msleep(wm8903->mic_delay); + } + + snd_soc_update_bits(codec, WM8903_INTERRUPT_POLARITY_1, + WM8903_MICSHRT_INV | WM8903_MICDET_INV, int_pol); + + snd_soc_jack_report(wm8903->mic_jack, mic_report, + wm8903->mic_short | wm8903->mic_det); + + wm8903->mic_last_report = mic_report; + return IRQ_HANDLED; } |