ASoC: rockchip: Support headset button function on rk3399

Set the mapping between button and media key event.
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rk3399_gru_sound.c

@@ -23,6 +23,7 @@
 #include <linux/of_gpio.h>
 #include <linux/delay.h>
 #include <linux/spi/spi.h>
+#include <linux/input.h>
 #include <sound/core.h>
 #include <sound/jack.h>
 #include <sound/pcm.h>
@@ -209,6 +210,14 @@ static int rockchip_sound_da7219_init(struct snd_soc_pcm_runtime *rtd)
 		return ret;
 	}
 
+	snd_jack_set_key(rockchip_sound_jack.jack, SND_JACK_BTN_0, KEY_MEDIA);
+	snd_jack_set_key(
+		rockchip_sound_jack.jack, SND_JACK_BTN_1, KEY_VOLUMEUP);
+	snd_jack_set_key(
+		rockchip_sound_jack.jack, SND_JACK_BTN_2, KEY_VOLUMEDOWN);
+	snd_jack_set_key(
+		rockchip_sound_jack.jack, SND_JACK_BTN_3, KEY_VOICECOMMAND);
+
 	da7219_aad_jack_det(codec, &rockchip_sound_jack);
 
 	return 0;