ASoC: Automatically determine control_data for soc-cache users

Since the provision of a struct device for the CODEC is now mandatory
we can use container_of() to locate the struct i2c_client and struct
spi_device for relevant devices, removing the need to manually set it
in each driver.

A further patch will automate selection of the control type based on
the bus_type of the struct device, further reducing the amount of
driver code required.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/soc-cache.c

@@ -584,11 +584,19 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 #endif
 		if (io_types[i].i2c_read)
 			codec->hw_read = io_types[i].i2c_read;
+
+		codec->control_data = container_of(codec->dev,
+						   struct i2c_client,
+						   dev);
 		break;
 
 	case SND_SOC_SPI:
 		if (io_types[i].spi_write)
 			codec->hw_write = io_types[i].spi_write;
+
+		codec->control_data = container_of(codec->dev,
+						   struct spi_device,
+						   dev);
 		break;
 	}