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ASoC: Initial WM8903 microphone bias and short detection
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Provide support for WM8903 microphone presence and short detection
using the GPIOs to route out a logic signal suitable for handling
using snd_soc_jack_add_gpios() on the processor GPIOs.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
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Mark Brown committed Mar 16, 2010
1 parent 73b34ea commit 37f88e8
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Showing 3 changed files with 45 additions and 30 deletions.
29 changes: 29 additions & 0 deletions include/sound/wm8903.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,28 @@
/* Used to enable configuration of a GPIO to all zeros */
#define WM8903_GPIO_NO_CONFIG 0x8000

/*
* R6 (0x06) - Mic Bias Control 0
*/
#define WM8903_MICDET_HYST_ENA 0x0080 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_MASK 0x0080 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_SHIFT 7 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_WIDTH 1 /* MICDET_HYST_ENA */
#define WM8903_MICDET_THR_MASK 0x0070 /* MICDET_THR - [6:4] */
#define WM8903_MICDET_THR_SHIFT 4 /* MICDET_THR - [6:4] */
#define WM8903_MICDET_THR_WIDTH 3 /* MICDET_THR - [6:4] */
#define WM8903_MICSHORT_THR_MASK 0x000C /* MICSHORT_THR - [3:2] */
#define WM8903_MICSHORT_THR_SHIFT 2 /* MICSHORT_THR - [3:2] */
#define WM8903_MICSHORT_THR_WIDTH 2 /* MICSHORT_THR - [3:2] */
#define WM8903_MICDET_ENA 0x0002 /* MICDET_ENA */
#define WM8903_MICDET_ENA_MASK 0x0002 /* MICDET_ENA */
#define WM8903_MICDET_ENA_SHIFT 1 /* MICDET_ENA */
#define WM8903_MICDET_ENA_WIDTH 1 /* MICDET_ENA */
#define WM8903_MICBIAS_ENA 0x0001 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_MASK 0x0001 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_SHIFT 0 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_WIDTH 1 /* MICBIAS_ENA */

/*
* R116 (0x74) - GPIO Control 1
*/
Expand Down Expand Up @@ -210,6 +232,13 @@
#define WM8903_GP5_DB_WIDTH 1 /* GP5_DB */

struct wm8903_platform_data {
/* Default register value for R6 (Mic bias), used to configure
* microphone detection. In conjunction with gpio_cfg this
* can be used to route the microphone status signals out onto
* the GPIOs for use with snd_soc_jack_add_gpios().
*/
u16 micdet_cfg;

u32 gpio_cfg[5]; /* Default register values for GPIO pin mux */
};

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24 changes: 16 additions & 8 deletions sound/soc/codecs/wm8903.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@
*
* TODO:
* - TDM mode configuration.
* - Mic detect.
* - Digital microphone support.
* - Interrupt support (mic detect and sequencer).
*/
Expand Down Expand Up @@ -246,10 +245,10 @@ static int wm8903_run_sequence(struct snd_soc_codec *codec, unsigned int start)

BUG_ON(start > 48);

/* Enable the sequencer */
/* Enable the sequencer if it's not already on */
reg[0] = snd_soc_read(codec, WM8903_WRITE_SEQUENCER_0);
reg[0] |= WM8903_WSEQ_ENA;
snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0, reg[0]);
snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0,
reg[0] | WM8903_WSEQ_ENA);

dev_dbg(&i2c->dev, "Starting sequence at %d\n", start);

Expand All @@ -268,9 +267,8 @@ static int wm8903_run_sequence(struct snd_soc_codec *codec, unsigned int start)

dev_dbg(&i2c->dev, "Sequence complete\n");

/* Disable the sequencer again */
snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0,
reg[0] & ~WM8903_WSEQ_ENA);
/* Disable the sequencer again if we enabled it */
snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0, reg[0]);

return 0;
}
Expand Down Expand Up @@ -1578,7 +1576,7 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,

wm8903_reset(codec);

/* Set up GPIOs */
/* Set up GPIOs and microphone detection */
if (pdata) {
for (i = 0; i < ARRAY_SIZE(pdata->gpio_cfg); i++) {
if (!pdata->gpio_cfg[i])
Expand All @@ -1587,6 +1585,16 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,
snd_soc_write(codec, WM8903_GPIO_CONTROL_1 + i,
pdata->gpio_cfg[i] & 0xffff);
}

snd_soc_write(codec, WM8903_MIC_BIAS_CONTROL_0,
pdata->micdet_cfg);

/* Microphone detection needs the WSEQ clock */
if (pdata->micdet_cfg)
snd_soc_update_bits(codec, WM8903_WRITE_SEQUENCER_0,
WM8903_WSEQ_ENA, WM8903_WSEQ_ENA);

wm8903->mic_delay = pdata->micdet_delay;
}

/* power on device */
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22 changes: 0 additions & 22 deletions sound/soc/codecs/wm8903.h
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Original file line number Diff line number Diff line change
Expand Up @@ -172,28 +172,6 @@ extern struct snd_soc_codec_device soc_codec_dev_wm8903;
#define WM8903_VMID_RES_250K 3
#define WM8903_VMID_RES_5K 4

/*
* R6 (0x06) - Mic Bias Control 0
*/
#define WM8903_MICDET_HYST_ENA 0x0080 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_MASK 0x0080 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_SHIFT 7 /* MICDET_HYST_ENA */
#define WM8903_MICDET_HYST_ENA_WIDTH 1 /* MICDET_HYST_ENA */
#define WM8903_MICDET_THR_MASK 0x0070 /* MICDET_THR - [6:4] */
#define WM8903_MICDET_THR_SHIFT 4 /* MICDET_THR - [6:4] */
#define WM8903_MICDET_THR_WIDTH 3 /* MICDET_THR - [6:4] */
#define WM8903_MICSHORT_THR_MASK 0x000C /* MICSHORT_THR - [3:2] */
#define WM8903_MICSHORT_THR_SHIFT 2 /* MICSHORT_THR - [3:2] */
#define WM8903_MICSHORT_THR_WIDTH 2 /* MICSHORT_THR - [3:2] */
#define WM8903_MICDET_ENA 0x0002 /* MICDET_ENA */
#define WM8903_MICDET_ENA_MASK 0x0002 /* MICDET_ENA */
#define WM8903_MICDET_ENA_SHIFT 1 /* MICDET_ENA */
#define WM8903_MICDET_ENA_WIDTH 1 /* MICDET_ENA */
#define WM8903_MICBIAS_ENA 0x0001 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_MASK 0x0001 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_SHIFT 0 /* MICBIAS_ENA */
#define WM8903_MICBIAS_ENA_WIDTH 1 /* MICBIAS_ENA */

/*
* R8 (0x08) - Analogue DAC 0
*/
Expand Down

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