linux-kernel - [PATCH 4/5] ASoC: rk3399_gru_sound: Map BTN_0 to KEY

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Date:   Wed, 22 Nov 2017 12:56:42 -0800
From:   Benson Leung <bleung@...omium.org>
To:     broonie@...nel.org, linux-kernel@...r.kernel.org
Cc:     harshapriya.n@...el.com, naveen.m@...el.com,
        srinivas.kandagatla@...aro.org, cychiang@...omium.org,
        dgreid@...omium.org, anatol.pomozov@...il.com, bleung@...omium.org,
        bleung@...gle.com
Subject: [PATCH 4/5] ASoC: rk3399_gru_sound: Map BTN_0 to KEY_PLAYPAUSE

The Android 3.5mm Headset jack specification mentions that BTN_0 should
be mapped to KEY_MEDIA, but this is less logical than KEY_PLAYPAUSE,
which has much broader userspace support.

For example, the Chrome OS userspace now supports KEY_PLAYPAUSE to toggle
play/pause of videos and audio, but does not handle KEY_MEDIA.

Furthermore, Android itself now supports KEY_PLAYPAUSE equivalently, as the
new USB headset spec requires KEY_PLAYPAUSE for BTN_0.
https://source.android.com/devices/accessories/headset/usb-headset-spec

Signed-off-by: Benson Leung <bleung@...omium.org>
---
 sound/soc/rockchip/rk3399_gru_sound.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
index d64fbbd50544..fa6cd1de828b 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -206,7 +206,8 @@ 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_0, KEY_PLAYPAUSE);
 	snd_jack_set_key(
 		rockchip_sound_jack.jack, SND_JACK_BTN_1, KEY_VOLUMEUP);
 	snd_jack_set_key(
-- 
2.15.0.448.gf294e3d99a-goog