ASoC: Intel: Headset button support in kabylake machine driver

Patch adds headset button support for kabylake machine driver
(kbl_rt5663_max98927).

Signed-off-by: Naveen M <naveen.m@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/kbl_rt5663_max98927.c

@@ -17,6 +17,7 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/input.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <sound/core.h>
@@ -208,6 +209,7 @@ static int kabylake_rt5663_codec_init(struct snd_soc_pcm_runtime *rtd)
 	int ret;
 	struct kbl_rt5663_private *ctx = snd_soc_card_get_drvdata(rtd->card);
 	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_jack *jack;
 
 	/*
 	 * Headset buttons map to the google Reference headset.
@@ -221,6 +223,13 @@ static int kabylake_rt5663_codec_init(struct snd_soc_pcm_runtime *rtd)
 		dev_err(rtd->dev, "Headset Jack creation failed %d\n", ret);
 		return ret;
 	}
+
+	jack = &ctx->kabylake_headset;
+	snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_MEDIA);
+	snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
+	snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
+	snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
+
 	rt5663_set_jack_detect(codec, &ctx->kabylake_headset);
 	return ret;
 }