[PATCH v4 2/6] ASoC: ops: add snd_soc_get_volsw_clamped

[Niranjan H Y <niranjan.hy@ti.com>]

  Add API snd_soc_get_volsw_clamped to read
  the volume from device. This similar to
  existing API snd_soc_get_volsw. But has
  additional step to clamp the value to max value
  if the register value is larger than max value.

Signed-off-by: Niranjan H Y <niranjan.hy@ti.com>
---
 include/sound/soc.h |  2 ++
 sound/soc/soc-ops.c | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 1fffef311..34a490ece 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -553,6 +553,8 @@ int snd_soc_info_volsw_sx(struct snd_kcontrol *kcontrol,
 #define snd_soc_info_bool_ext		snd_ctl_boolean_mono_info
 int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);
+int snd_soc_get_volsw_clamped(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol);
 int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);
 #define snd_soc_get_volsw_2r snd_soc_get_volsw
diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 59e91741b..4d1ee5cd2 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -354,6 +354,28 @@ int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
 }
 EXPORT_SYMBOL_GPL(snd_soc_get_volsw);
 
+/**
+ * snd_soc_get_volsw_clamped - single mixer get callback with range
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Similar to snd_soc_get_volsw, with additional operation to
+ * clamp the register value to its maximum.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_get_volsw_clamped(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	unsigned int mask = soc_mixer_mask(mc);
+
+	return soc_get_volsw(kcontrol, ucontrol, mc, mask,
+			     mc->max - mc->min, true);
+}
+EXPORT_SYMBOL_GPL(snd_soc_get_volsw_clamped);
+
 /**
  * snd_soc_put_volsw - single mixer put callback with range
  * @kcontrol: mixer control
-- 
2.45.2