[PATCH 11/28] ASoC: ops: Introduce 'snd_soc_deactivate_kctl'

[James Calligeros]

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

The new function can be used to deactivate controls -- either a single
one or in bulk by pattern. It is something a machine driver may call in
fixup_controls.

Signed-off-by: Martin Povišer <povik+lin at cutebit.org>
Signed-off-by: James Calligeros <jcalligeros99 at gmail.com>
---
 include/sound/soc.h |  2 ++
 sound/soc/soc-ops.c | 38 +++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 553bb7e2be98..973ffaf6f060 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_deactivate_kctl(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 2f91ee7946bb..d35e24df891b 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -512,6 +512,44 @@ int snd_soc_limit_volume(struct snd_soc_card *card, const char *name, int max)
 }
 EXPORT_SYMBOL_GPL(snd_soc_limit_volume);
 
+/**
+ * snd_soc_deactivate_kctl - Activate/deactivate controls matching a pattern
+ *
+ * @card: where to look for the controls
+ * @name: name pattern
+ * @active: non-zero to activate, zero to deactivate
+ *
+ * Return number of matching controls on success, else error.
+ * No controls need to match.
+ */
+int snd_soc_deactivate_kctl(struct snd_soc_card *card,
+	const char *name, int active)
+{
+	struct snd_kcontrol *kctl;
+	int hits = 0;
+	int ret;
+
+	/* Sanity check for name */
+	if (unlikely(!name))
+		return -EINVAL;
+
+	list_for_each_entry(kctl, &card->snd_card->controls, list) {
+		if (!soc_control_matches(kctl, name))
+			continue;
+
+		ret = snd_ctl_activate_id(card->snd_card, &kctl->id, active);
+		if (ret < 0)
+			return ret;
+		hits++;
+	}
+
+	if (!hits)
+		return -EINVAL;
+
+	return hits;
+}
+EXPORT_SYMBOL_GPL(snd_soc_deactivate_kctl);
+
 int snd_soc_bytes_info(struct snd_kcontrol *kcontrol,
 		       struct snd_ctl_elem_info *uinfo)
 {

-- 
2.55.0