[PATCH v3 04/21] ASoC: ops: Introduce 'snd_soc_ctl_activate'

[James Calligeros <jcalligeros99@gmail.com>]

From: Martin Povišer <povik+lin@cutebit.org>

This function mirrors wraps the sound/core 'snd_ctl_activate_id'
for ASoC. Machine drivers may call it to lock down kcontrols
during fixup_controls.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
 include/sound/soc.h |  2 ++
 sound/soc/soc-ops.c | 32 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 553bb7e2be98..7509824a6b2e 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -578,6 +578,8 @@ int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);
 int snd_soc_limit_volume(struct snd_soc_card *card,
 	const char *name, int max);
+int snd_soc_ctl_activate(struct snd_soc_card *card,
+	const char *name, int active);
 int snd_soc_bytes_info(struct snd_kcontrol *kcontrol,
 		       struct snd_ctl_elem_info *uinfo);
 int snd_soc_bytes_get(struct snd_kcontrol *kcontrol,
diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 142f407e3939..295056bcc081 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -471,6 +471,38 @@ int snd_soc_limit_volume(struct snd_soc_card *card, const char *name, int max)
 }
 EXPORT_SYMBOL_GPL(snd_soc_limit_volume);
 
+/**
+ * snd_soc_ctl_activate - Activate/deactivate a control matching a name
+ *
+ * @card: where to look for the control
+ * @name: name
+ * @active: zero to deactivate, nonzero to activate
+ *
+ * Return: 0 if unchanged, 1 if changed, or a negative error code on failure.
+ */
+int snd_soc_ctl_activate(struct snd_soc_card *card,
+			 const char *name, int active)
+{
+	struct snd_kcontrol *kctl;
+	int ret = -EINVAL;
+
+	if (!name)
+		return ret;
+
+	kctl = snd_soc_card_get_kcontrol(card, name);
+
+	if (kctl) {
+		ret = snd_ctl_activate_id(card->snd_card, &kctl->id, active);
+		if (ret < 0)
+			return ret;
+	} else {
+		dev_dbg(card->dev, "Tried to de/activate unknown control '%s'\n", name);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_ctl_activate);
+
 int snd_soc_bytes_info(struct snd_kcontrol *kcontrol,
 		       struct snd_ctl_elem_info *uinfo)
 {

-- 
2.56.0