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ASoC: Add Speyside headset jack detection support

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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: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2011-04-12 00:00:36 -07:00
parent ea3e98e75a
commit 68688e78ed
1 changed files with 77 additions and 1 deletions
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78
sound/soc/samsung/speyside.c
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@ -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;
return snd_soc_dai_set_sysclk(dai, WM8915_SYSCLK_MCLK1, 32768, 0);
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);
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" },