ASoC: WM8903: Create default platform data structure

When no platform data is supplied, point pdata at a default platform
structure. This enables two future changes:

a) Defines the default platform data values in a single place.
b) There is always a valid pdata pointer, so some conditional code can
   be simplified by a later patch.

Based on work by John Bonesio, but significantly reworked since then.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
index a75688b5a568..e6ecede576dc 100644
--- a/sound/soc/codecs/wm8903.c
+++ b/sound/soc/codecs/wm8903.c
@@ -114,6 +114,7 @@ static const struct reg_default wm8903_reg_defaults[] = {
 };
 
 struct wm8903_priv {
+        struct wm8903_platform_data *pdata;
         struct snd_soc_codec *codec;
         struct regmap *regmap;
 
@@ -1834,7 +1835,7 @@ static struct gpio_chip wm8903_template_chip = {
 static void wm8903_init_gpio(struct snd_soc_codec *codec)
 {
         struct wm8903_priv *wm8903 = snd_soc_codec_get_drvdata(codec);
-        struct wm8903_platform_data *pdata = dev_get_platdata(codec->dev);
+        struct wm8903_platform_data *pdata = wm8903->pdata;
         int ret;
 
         wm8903->gpio_chip = wm8903_template_chip;
@@ -1872,8 +1873,8 @@ static void wm8903_free_gpio(struct snd_soc_codec *codec)
 
 static int wm8903_probe(struct snd_soc_codec *codec)
 {
-        struct wm8903_platform_data *pdata = dev_get_platdata(codec->dev);
         struct wm8903_priv *wm8903 = snd_soc_codec_get_drvdata(codec);
+        struct wm8903_platform_data *pdata = wm8903->pdata;
         int ret, i;
         int trigger, irq_pol;
         u16 val;
@@ -2039,6 +2040,7 @@ static const struct regmap_config wm8903_regmap = {
 static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,
                                       const struct i2c_device_id *id)
 {
+        struct wm8903_platform_data *pdata = dev_get_platdata(&i2c->dev);
         struct wm8903_priv *wm8903;
         unsigned int val;
         int ret;
@@ -2059,6 +2061,19 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,
         i2c_set_clientdata(i2c, wm8903);
         wm8903->irq = i2c->irq;
 
+        /* If no platform data was supplied, create storage for defaults */
+        if (pdata) {
+                wm8903->pdata = pdata;
+        } else {
+                wm8903->pdata = devm_kzalloc(&i2c->dev,
+                                        sizeof(struct wm8903_platform_data),
+                                        GFP_KERNEL);
+                if (wm8903->pdata == NULL) {
+                        dev_err(&i2c->dev, "Failed to allocate pdata\n");
+                        return -ENOMEM;
+                }
+        }
+
         ret = regmap_read(wm8903->regmap, WM8903_SW_RESET_AND_ID, &val);
         if (ret != 0) {
                 dev_err(&i2c->dev, "Failed to read chip ID: %d\n", ret);