ASoC: Implement interrupt driven microphone detection for WM8903

Support use of the WM8903 IRQ for reporting of microphone presence
and short detection.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-03-15 21:22:58 +00:00
parent 8abd16a65d
commit 7245387e36
3 changed files with 109 additions and 3 deletions

View File

@ -241,6 +241,8 @@ struct wm8903_platform_data {
*/
u16 micdet_cfg;
int micdet_delay; /* Delay after microphone detection (ms) */
u32 gpio_cfg[5]; /* Default register values for GPIO pin mux */
};

View File

@ -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;
}

View File

@ -18,6 +18,10 @@
extern struct snd_soc_dai wm8903_dai;
extern struct snd_soc_codec_device soc_codec_dev_wm8903;
extern int wm8903_mic_detect(struct snd_soc_codec *codec,
struct snd_soc_jack *jack,
int det, int shrt);
#define WM8903_MCLK_DIV_2 1
#define WM8903_CLK_SYS 2
#define WM8903_BCLK 3