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Commit 68688e78 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Add Speyside headset jack detection support 



Speyside makes use of support the WM8915 has for detecting the polarity
of the microphone and ground connections on headsets, using a GPIO to
control the polarity of the ground connection and switching between the
two microphone bias supplies available on the device in order to do so.
As a result of this the detection support is more involved than for most
other CODECs, using a callback to configure the current polarity of the
jack and translate this into the board-specific connections required for
the current scenario.

On Android some additional work is required to hook this up to the
application layer as the Android HeadsetObserver monitors a custom
drivers/switch API rather than the standard Linux APIs.  This can be
done by either updating HeadsetObserver or modifying the ALSA core to
report via drivers/switch as well.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
Acked-by: default avatarLiam Girdwood <lrg@ti.com>
parent ea3e98e7

sound/soc/samsung/speyside.c

+77 −1
Original line number Diff line number Diff line
@@ -11,10 +11,14 @@ 


#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <sound/jack.h>

#include <linux/gpio.h>



#include "../codecs/wm8915.h"

#include "../codecs/wm9081.h"



#define WM8915_HPSEL_GPIO 214



static int speyside_set_bias_level(struct snd_soc_card *card,

				   enum snd_soc_bias_level level)

{
@@ -79,11 +83,74 @@ static struct snd_soc_ops speyside_ops = { 
	.hw_params = speyside_hw_params,

};



static struct snd_soc_jack speyside_headset;



/* Headset jack detection DAPM pins */

static struct snd_soc_jack_pin speyside_headset_pins[] = {

	{

		.pin = "Headset Mic",

		.mask = SND_JACK_MICROPHONE,

	},

	{

		.pin = "Headphone",

		.mask = SND_JACK_HEADPHONE,

	},

};



/* Default the headphone selection to active high */

static int speyside_jack_polarity;



static int speyside_get_micbias(struct snd_soc_dapm_widget *source,

				struct snd_soc_dapm_widget *sink)

{

	if (speyside_jack_polarity && (strcmp(source->name, "MICB1") == 0))

		return 1;

	if (!speyside_jack_polarity && (strcmp(source->name, "MICB2") == 0))

		return 1;



	return 0;

}



static void speyside_set_polarity(struct snd_soc_codec *codec,

				  int polarity)

{

	speyside_jack_polarity = !polarity;

	gpio_direction_output(WM8915_HPSEL_GPIO, speyside_jack_polarity);



	/* Re-run DAPM to make sure we're using the correct mic bias */

	snd_soc_dapm_sync(&codec->dapm);

}



static int speyside_wm8915_init(struct snd_soc_pcm_runtime *rtd)

{

	struct snd_soc_dai *dai = rtd->codec_dai;

	struct snd_soc_codec *codec = rtd->codec;

	int ret;



	ret = snd_soc_dai_set_sysclk(dai, WM8915_SYSCLK_MCLK1, 32768, 0);

	if (ret < 0)

		return ret;



	ret = gpio_request(WM8915_HPSEL_GPIO, "HP_SEL");

	if (ret != 0)

		pr_err("Failed to request HP_SEL GPIO: %d\n", ret);

	gpio_direction_output(WM8915_HPSEL_GPIO, speyside_jack_polarity);



	return snd_soc_dai_set_sysclk(dai, WM8915_SYSCLK_MCLK1, 32768, 0);

	ret = snd_soc_jack_new(codec, "Headset",

			       SND_JACK_HEADSET | SND_JACK_BTN_0,

			       &speyside_headset);

	if (ret)

		return ret;



	ret = snd_soc_jack_add_pins(&speyside_headset,

				    ARRAY_SIZE(speyside_headset_pins),

				    speyside_headset_pins);

	if (ret)

		return ret;



	wm8915_detect(codec, &speyside_headset, speyside_set_polarity);



	return 0;

}



static struct snd_soc_dai_link speyside_dai[] = {
@@ -125,6 +192,7 @@ static struct snd_soc_codec_conf speyside_codec_conf[] = { 


static struct snd_soc_dapm_widget widgets[] = {

	SND_SOC_DAPM_HP("Headphone", NULL),

	SND_SOC_DAPM_MIC("Headset Mic", NULL),



	SND_SOC_DAPM_SPK("Main Speaker", NULL),
@@ -133,7 +201,15 @@ static struct snd_soc_dapm_widget widgets[] = { 
};



static struct snd_soc_dapm_route audio_paths[] = {

	{ "IN1RN", NULL, "MICB1" },

	{ "IN1RP", NULL, "MICB1" },

	{ "IN1RN", NULL, "MICB2" },

	{ "IN1RP", NULL, "MICB2" },

	{ "MICB1", NULL, "Headset Mic", speyside_get_micbias },

	{ "MICB2", NULL, "Headset Mic", speyside_get_micbias },



	{ "IN1LP", NULL, "MICB2" },

	{ "IN1RN", NULL, "MICB1" },

	{ "MICB2", NULL, "Main AMIC" },



	{ "DMIC1DAT", NULL, "MICB1" },