linux-kernel - [alsa-devel][PATCH 1/4] ASoC: wm8960: Let wm8960 codec driver manage its own MCLK

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Message-ID: <1419997154-860-1-git-send-email-b50113@freescale.com>
Date:	Wed, 31 Dec 2014 11:39:11 +0800
From:	Zidan Wang <b50113@...escale.com>
To:	<broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <perex@...ex.cz>, <tiwai@...e.de>,
	<lars@...afoo.de>, <ckeepax@...nsource.wolfsonmicro.com>,
	<Li.Xiubo@...escale.com>, <patches@...nsource.wolfsonmicro.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
	Zidan Wang <b50113@...escale.com>
Subject: [alsa-devel][PATCH 1/4] ASoC: wm8960: Let wm8960 codec driver manage its own MCLK

When we want to use wm8960 codec, we should enable its MCLK in machine driver.
It's reasonable for wm8960 codec driver to manage its own MCLK.

When current bias_level is SND_SOC_BIAS_ON, it is preparing for a transition
away from ON. In this case, disable the codec mclk. When current bias_level
is not SND_SOC_BIAS_ON, it preparing for a transition to ON. In this case,
enable the codec mclk.

Signed-off-by: Zidan Wang <b50113@...escale.com>
---
 sound/soc/codecs/wm8960.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 031a1ae..1a5f47b 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
+#include <linux/clk.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <sound/core.h>
@@ -117,6 +118,7 @@ static bool wm8960_volatile(struct device *dev, unsigned int reg)
 }
 
 struct wm8960_priv {
+	struct clk *mclk;
 	struct regmap *regmap;
 	int (*set_bias_level)(struct snd_soc_codec *,
 			      enum snd_soc_bias_level level);
@@ -618,6 +620,7 @@ static int wm8960_set_bias_level_out3(struct snd_soc_codec *codec,
 				      enum snd_soc_bias_level level)
 {
 	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+	int ret;
 
 	switch (level) {
 	case SND_SOC_BIAS_ON:
@@ -626,6 +629,20 @@ static int wm8960_set_bias_level_out3(struct snd_soc_codec *codec,
 	case SND_SOC_BIAS_PREPARE:
 		/* Set VMID to 2x50k */
 		snd_soc_update_bits(codec, WM8960_POWER1, 0x180, 0x80);
+
+		if (!IS_ERR(wm8960->mclk)) {
+			if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
+				clk_disable_unprepare(wm8960->mclk);
+			else {
+				ret = clk_prepare_enable(wm8960->mclk);
+				if (ret) {
+					dev_err(codec->dev,
+						"Failed to enable MCLK: %d\n",
+						ret);
+					return ret;
+				}
+			}
+		}
 		break;
 
 	case SND_SOC_BIAS_STANDBY:
@@ -661,6 +678,7 @@ static int wm8960_set_bias_level_out3(struct snd_soc_codec *codec,
 
 		/* Disable VMID and VREF, let them discharge */
 		snd_soc_write(codec, WM8960_POWER1, 0);
+
 		msleep(600);
 		break;
 	}
@@ -674,7 +692,7 @@ static int wm8960_set_bias_level_capless(struct snd_soc_codec *codec,
 					 enum snd_soc_bias_level level)
 {
 	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
-	int reg;
+	int reg, ret;
 
 	switch (level) {
 	case SND_SOC_BIAS_ON:
@@ -715,9 +733,22 @@ static int wm8960_set_bias_level_capless(struct snd_soc_codec *codec,
 					    WM8960_VREF, WM8960_VREF);
 
 			msleep(100);
+
+			if (!IS_ERR(wm8960->mclk)) {
+				ret = clk_prepare_enable(wm8960->mclk);
+				if (ret) {
+					dev_err(codec->dev,
+						"Failed to enable MCLK: %d\n",
+						ret);
+					return ret;
+				}
+			}
 			break;
 
 		case SND_SOC_BIAS_ON:
+			if (!IS_ERR(wm8960->mclk))
+				clk_disable_unprepare(wm8960->mclk);
+
 			/* Enable anti-pop mode */
 			snd_soc_update_bits(codec, WM8960_APOP1,
 					    WM8960_POBCTRL | WM8960_SOFT_ST |
@@ -728,6 +759,7 @@ static int wm8960_set_bias_level_capless(struct snd_soc_codec *codec,
 			/* Disable VMID and VREF */
 			snd_soc_update_bits(codec, WM8960_POWER1,
 					    WM8960_VREF | WM8960_VMID_MASK, 0);
+
 			break;
 
 		case SND_SOC_BIAS_OFF:
@@ -1002,6 +1034,12 @@ static int wm8960_i2c_probe(struct i2c_client *i2c,
 	if (wm8960 == NULL)
 		return -ENOMEM;
 
+	wm8960->mclk = devm_clk_get(&i2c->dev, "codec_mclk");
+	if (IS_ERR(wm8960->mclk)) {
+		if (PTR_ERR(wm8960->mclk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+	}
+
 	wm8960->regmap = devm_regmap_init_i2c(i2c, &wm8960_regmap);
 	if (IS_ERR(wm8960->regmap))
 		return PTR_ERR(wm8960->regmap);
-- 
1.9.1

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