linux-kernel - [PATCH v2 3/4] ASoC: dapm: Introduce DAPM

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Message-Id: <20161102073601.8659-4-wens@csie.org>
Date:   Wed,  2 Nov 2016 15:36:00 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Mylene Josserand <mylene.josserand@...e-electrons.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] ASoC: dapm: Introduce DAPM_DOUBLE dual channel control type

A DAPM_DOUBLE control type can be used for dual channel mixer input
selectors / mute controls in one register, possibly toggling both
channels together.

The control is meant to be shared by 2 widgets, 1 for each channel,
such that the mixer control exposed to userspace remains a combined
stereo control.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 include/sound/soc-dapm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index d5f4677776ce..f74ec19687f8 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -272,6 +272,11 @@ struct device;
 
 
 /* dapm kcontrol types */
+#define SOC_DAPM_DOUBLE(xname, reg, lshift, rshift, max, invert) \
+{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+	.info = snd_soc_info_volsw, \
+	.get = snd_soc_dapm_get_volsw, .put = snd_soc_dapm_put_volsw, \
+	.private_value = SOC_DOUBLE_VALUE(reg, lshift, rshift, max, invert, 0) }
 #define SOC_DAPM_SINGLE(xname, reg, shift, max, invert) \
 {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
 	.info = snd_soc_info_volsw, \
-- 
2.10.2