ASoC: io: Retrieve val_bytes from the regmap API

Allow us to build infrastructure which needs to know the size of a value
without requiring regmap based drivers to supply this information to both
ASoC and regmap by asking regmap for the value.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/soc-io.c b/sound/soc/soc-io.c
index 39ba507..4d8dc6a 100644
--- a/sound/soc/soc-io.c
+++ b/sound/soc/soc-io.c
@@ -114,6 +114,7 @@
 			       enum snd_soc_control_type control)
 {
 	struct regmap_config config;
+	int ret;
 
 	memset(&config, 0, sizeof(config));
 	codec->write = hw_write;
@@ -141,6 +142,11 @@
 	case SND_SOC_REGMAP:
 		/* Device has made its own regmap arrangements */
 		codec->using_regmap = true;
+
+		ret = regmap_get_val_bytes(codec->control_data);
+		/* Errors are legitimate for non-integer byte multiples */
+		if (ret > 0)
+			codec->val_bytes = ret;
 		break;
 
 	default: