[alsa-devel] [PATCH v2 14/14] ASoC: twl4030: Support for DT booted kernel

[Peter Ujfalusi]

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 at ti.com>
---
 sound/soc/codecs/twl4030.c |   57 +++++++++++++++++++++++++++++++++++++------
 1 files changed, 49 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 8b13d50..f13c91a 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 +297,59 @@ 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;
+
+#ifdef CONFIG_OF
+	twl4030_codec_node = of_find_node_by_name(codec->dev->parent->of_node,
+						  "codec");
+#endif
+
+	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;
@@ -2284,13 +2332,6 @@ 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));
 }
-- 
1.7.8.6