CHROMIUM: ASoC: samsung: HP detect plumbing for snow

This adds HP detect through the external GPIO on Snow. I've hardcoded
the GPIO for now since we need to move the whole ASoC configuration to
device tree (a la tegra) and will move it to a proper gpio specifier
there when we do so.

BUG=none
TEST=start up, browse youtube, bring up an awesome music video, plug in
headphones, rock out.

Change-Id: I9b7d1452f43f68f1e17bc8868f1d9c56d09db87b
Signed-off-by: Olof Johansson <olofj@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/27866
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: Katie Roberts-Hoffman <katierh@chromium.org>

Author: Olof Johansson

sound/soc/samsung/daisy_max98095.c

@@ -30,6 +30,7 @@
 #include <sound/jack.h>
 #include <sound/max98095.h>
 
+#include <mach/gpio.h>
 
 #include "i2s.h"
 #include "s3c-i2s-v2.h"
@@ -183,6 +184,19 @@ static struct snd_soc_ops daisy_ops = {
 	.hw_params = daisy_hw_params,
 };
 
+static struct snd_soc_jack daisy_hp_jack;
+static struct snd_soc_jack_pin daisy_hp_jack_pins[] = {
+	{
+		.pin = "Headphone Jack",
+		.mask = SND_JACK_HEADPHONE,
+	},
+};
+
+static struct snd_soc_jack_gpio daisy_hp_jack_gpio = {
+	.name = "headphone detect",
+	.report = SND_JACK_HEADPHONE,
+};
+
 static struct snd_soc_jack daisy_mic_jack;
 static struct snd_soc_jack_pin daisy_mic_jack_pins[] = {
 	{
@@ -198,6 +212,7 @@ static const struct snd_soc_dapm_route daisy_audio_map[] = {
 
 static const struct snd_soc_dapm_widget daisy_dapm_widgets[] = {
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 };
 
 static int daisy_init(struct snd_soc_pcm_runtime *rtd)
@@ -216,6 +231,17 @@ static int daisy_init(struct snd_soc_pcm_runtime *rtd)
 			      ARRAY_SIZE(daisy_mic_jack_pins),
 			      daisy_mic_jack_pins);
 
+	/* TODO: Move this to device tree */
+	if (of_machine_is_compatible("google,snow")) {
+		daisy_hp_jack_gpio.gpio = EXYNOS5_GPX2(2);
+		snd_soc_jack_new(codec, "Headphone Jack",
+				 SND_JACK_HEADPHONE, &daisy_hp_jack);
+		snd_soc_jack_add_pins(&daisy_hp_jack,
+				      ARRAY_SIZE(daisy_hp_jack_pins),
+				      daisy_hp_jack_pins);
+		snd_soc_jack_add_gpios(&daisy_hp_jack, 1, &daisy_hp_jack_gpio);
+	}
+
 	/* Microphone BIAS is needed to power the analog mic.
 	 * MICBIAS2 is connected to analog mic (MIC3, which is in turn
 	 * connected to MIC2 via 'External MIC') on Daisy.