ASoC: core - Add API call to register platform kcontrols.

In preparation for Dynamic PCM (AKA DSP) support.

Allow platform drivers to register kcontrols.
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -368,6 +368,8 @@ struct snd_kcontrol *snd_soc_cnew(const struct snd_kcontrol_new *_template,
 				  const char *prefix);
 int snd_soc_add_controls(struct snd_soc_codec *codec,
 	const struct snd_kcontrol_new *controls, int num_controls);
+int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
+	const struct snd_kcontrol_new *controls, int num_controls);
 int snd_soc_info_enum_double(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_info *uinfo);
 int snd_soc_info_enum_ext(struct snd_kcontrol *kcontrol,

sound/soc/soc-core.c

@@ -1948,6 +1948,36 @@ int snd_soc_add_controls(struct snd_soc_codec *codec,
 }
 EXPORT_SYMBOL_GPL(snd_soc_add_controls);
 
+/**
+ * snd_soc_add_platform_controls - add an array of controls to a platform.
+ * Convienience function to add a list of controls.
+ *
+ * @platform: platform to add controls to
+ * @controls: array of controls to add
+ * @num_controls: number of elements in the array
+ *
+ * Return 0 for success, else error.
+ */
+int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
+	const struct snd_kcontrol_new *controls, int num_controls)
+{
+	struct snd_card *card = platform->card->snd_card;
+	int err, i;
+
+	for (i = 0; i < num_controls; i++) {
+		const struct snd_kcontrol_new *control = &controls[i];
+		err = snd_ctl_add(card, snd_soc_cnew(control, platform,
+				control->name, NULL));
+		if (err < 0) {
+			dev_err(platform->dev, "Failed to add %s %d\n",control->name, err);
+			return err;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_add_platform_controls);
+
 /**
  * snd_soc_info_enum_double - enumerated double mixer info callback
  * @kcontrol: mixer control