linux-kernel - [PATCH] ASoC: max98090: add shutdown callback for max98090

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Message-Id: <1428483128-23498-2-git-send-email-wxt@rock-chips.com>
Date:	Wed,  8 Apr 2015 16:52:08 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Sonny Rao <sonnyrao@...omium.org>,
	Cheng-Yi Chiang <cychiang@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Mark Brown <broonie@...nel.org>,
	zhengxing <zhengxing@...k-chips.com>,
	"jay.xu" <xjq@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, Caesar Wang <wxt@...k-chips.com>,
	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	Dylan Reid <dgreid@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Tushar Behera <tushar.b@...sung.com>
Subject: [PATCH] ASoC: max98090: add shutdown callback for max98090

To fix pop noise when shutdown,the pop noise during shutdown
is the pmic cutoff power of codec without any notice.

Signed-off-by: jay.xu <xjq@...k-chips.com>
Signed-off-by: zhengxing <zhengxing@...k-chips.com>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>

Serien-cc: linux-kernel@...r.kernel.org
Serien-cc: devicetree@...r.kernel.org
Serien-cc: dianders@...omium.org

---

 sound/soc/codecs/max98090.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index b112b1c..066954a0 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -2611,6 +2611,22 @@ static int max98090_i2c_remove(struct i2c_client *client)
 	return 0;
 }
 
+static void max98090_i2c_shutdown(struct i2c_client *i2c)
+{
+	struct max98090_priv *max98090 = dev_get_drvdata(&i2c->dev);
+
+	dev_info(&i2c->dev, "shut down device\n");
+
+	/* Enable volume smoothing, disable zero cross.  This will cause
+	 * a quick 40ms ramp to mute on shutdown.
+	 */
+	regmap_write(max98090->regmap,
+		M98090_REG_LEVEL_CONTROL, M98090_VSENN_MASK);
+	regmap_write(max98090->regmap,
+		M98090_REG_DEVICE_SHUTDOWN, 0x00);
+	msleep(40);
+}
+
 #ifdef CONFIG_PM
 static int max98090_runtime_resume(struct device *dev)
 {
@@ -2697,6 +2713,7 @@ static struct i2c_driver max98090_i2c_driver = {
 	},
 	.probe  = max98090_i2c_probe,
 	.remove = max98090_i2c_remove,
+	.shutdown = max98090_i2c_shutdown,
 	.id_table = max98090_i2c_id,
 };
 
-- 
1.9.1


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