From 2d6d649a2e0fa0268c0d03d5b1d330ca7907d33c Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date: Mon, 10 Sep 2012 13:46:32 +0300
Subject: [PATCH] ASoC: twl4030: Support for DT booted kernel

When the kernel has been booted with DT blob the platform data is NULL for
the driver.
We need to construct the pdata based on the DT information for runtime use.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/twl4030.c | 55 ++++++++++++++++++++++++++++++++------
 1 file changed, 47 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index b4d1a4e794d8..e7f608996c41 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -26,6 +26,8 @@
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/i2c/twl.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
@@ -295,13 +297,57 @@ static inline void twl4030_reset_registers(struct snd_soc_codec *codec)
 
 }
 
-static void twl4030_init_chip(struct snd_soc_codec *codec)
+static void twl4030_setup_pdata_of(struct twl4030_codec_data *pdata,
+				   struct device_node *node)
+{
+	int value;
+
+	of_property_read_u32(node, "ti,digimic_delay",
+			     &pdata->digimic_delay);
+	of_property_read_u32(node, "ti,ramp_delay_value",
+			     &pdata->ramp_delay_value);
+	of_property_read_u32(node, "ti,offset_cncl_path",
+			     &pdata->offset_cncl_path);
+	if (!of_property_read_u32(node, "ti,hs_extmute", &value))
+		pdata->hs_extmute = value;
+
+	pdata->hs_extmute_gpio = of_get_named_gpio(node,
+						   "ti,hs_extmute_gpio", 0);
+	if (gpio_is_valid(pdata->hs_extmute_gpio))
+		pdata->hs_extmute = 1;
+}
+
+static struct twl4030_codec_data *twl4030_get_pdata(struct snd_soc_codec *codec)
 {
 	struct twl4030_codec_data *pdata = dev_get_platdata(codec->dev);
+	struct device_node *twl4030_codec_node = NULL;
+
+	twl4030_codec_node = of_find_node_by_name(codec->dev->parent->of_node,
+						  "codec");
+
+	if (!pdata && twl4030_codec_node) {
+		pdata = devm_kzalloc(codec->dev,
+				     sizeof(struct twl4030_codec_data),
+				     GFP_KERNEL);
+		if (!pdata) {
+			dev_err(codec->dev, "Can not allocate memory\n");
+			return NULL;
+		}
+		twl4030_setup_pdata_of(pdata, twl4030_codec_node);
+	}
+
+	return pdata;
+}
+
+static void twl4030_init_chip(struct snd_soc_codec *codec)
+{
+	struct twl4030_codec_data *pdata;
 	struct twl4030_priv *twl4030 = snd_soc_codec_get_drvdata(codec);
 	u8 reg, byte;
 	int i = 0;
 
+	pdata = twl4030_get_pdata(codec);
+
 	if (pdata && pdata->hs_extmute &&
 	    gpio_is_valid(pdata->hs_extmute_gpio)) {
 		int ret;
@@ -2290,13 +2336,6 @@ static struct snd_soc_codec_driver soc_codec_dev_twl4030 = {
 
 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 {
-	struct twl4030_codec_data *pdata = pdev->dev.platform_data;
-
-	if (!pdata) {
-		dev_err(&pdev->dev, "platform_data is missing\n");
-		return -EINVAL;
-	}
-
 	return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_twl4030,
 			twl4030_dai, ARRAY_SIZE(twl4030_dai));
 }
-- 
2.20.1