ASoC: Consolidate enum and value enum controls

The implementations for enum and value enum controls are almost identical. The
only difference is that the value enum uses an additional look-up table to map
the control value to the register value, while the enum control uses a direct
mapping. Enums and value enums can easily be distinguished at runtime, for value
enums the values field of the snd_soc_enum struct contains the look-up table,
while for enums it is NULL. This patch adds two new small helper functions
called snd_soc_enum_item_to_val() and snd_soc_enum_val_to_item() which map
between register value and control item. If the items field of the snd_soc_enum
struct is NULL the function will do a direct mapping otherwise they'll use the
look-up table to do the mapping. Using these small helper functions it is
possible to use the same kcontrol handlers for both enums and value enums. The
functions are added a inline functions in soc.h so they can also be used by the
DAPM code to accomplish similar consolidation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 41 insertions, 94 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 49d6c10f4612..60c700ccc518 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -195,11 +195,7 @@
         .get = snd_soc_get_enum_double, .put = snd_soc_put_enum_double, \
         .private_value = (unsigned long)&xenum }
 #define SOC_VALUE_ENUM(xname, xenum) \
-{       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,\
-        .info = snd_soc_info_enum_double, \
-        .get = snd_soc_get_value_enum_double, \
-        .put = snd_soc_put_value_enum_double, \
-        .private_value = (unsigned long)&xenum }
+        SOC_ENUM(xname, xenum)
 #define SOC_SINGLE_EXT(xname, xreg, xshift, xmax, xinvert,\
          xhandler_get, xhandler_put) \
 {       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
@@ -510,10 +506,6 @@ int snd_soc_get_enum_double(struct snd_kcontrol *kcontrol,
         struct snd_ctl_elem_value *ucontrol);
 int snd_soc_put_enum_double(struct snd_kcontrol *kcontrol,
         struct snd_ctl_elem_value *ucontrol);
-int snd_soc_get_value_enum_double(struct snd_kcontrol *kcontrol,
-        struct snd_ctl_elem_value *ucontrol);
-int snd_soc_put_value_enum_double(struct snd_kcontrol *kcontrol,
-        struct snd_ctl_elem_value *ucontrol);
 int snd_soc_info_volsw(struct snd_kcontrol *kcontrol,
         struct snd_ctl_elem_info *uinfo);
 #define snd_soc_info_bool_ext           snd_ctl_boolean_mono_info
@@ -1182,6 +1174,30 @@ static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc)
         return 1;
 }
 
+static inline unsigned int snd_soc_enum_val_to_item(struct soc_enum *e,
+        unsigned int val)
+{
+        unsigned int i;
+
+        if (!e->values)
+                return val;
+
+        for (i = 0; i < e->items; i++)
+                if (val == e->values[i])
+                        return i;
+
+        return 0;
+}
+
+static inline unsigned int snd_soc_enum_item_to_val(struct soc_enum *e,
+        unsigned int item)
+{
+        if (!e->values)
+                return item;
+
+        return e->values[item];
+}
+
 int snd_soc_util_init(void);
 void snd_soc_util_exit(void);
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 851733897206..2ddc7a4939d2 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2596,14 +2596,18 @@ int snd_soc_get_enum_double(struct snd_kcontrol *kcontrol,
 {
         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-        unsigned int val;
+        unsigned int val, item;
+        unsigned int reg_val;
 
-        val = snd_soc_read(codec, e->reg);
-        ucontrol->value.enumerated.item[0]
-                = (val >> e->shift_l) & e->mask;
-        if (e->shift_l != e->shift_r)
-                ucontrol->value.enumerated.item[1] =
-                        (val >> e->shift_r) & e->mask;
+        reg_val = snd_soc_read(codec, e->reg);
+        val = (reg_val >> e->shift_l) & e->mask;
+        item = snd_soc_enum_val_to_item(e, val);
+        ucontrol->value.enumerated.item[0] = item;
+        if (e->shift_l != e->shift_r) {
+                val = (reg_val >> e->shift_l) & e->mask;
+                item = snd_soc_enum_val_to_item(e, val);
+                ucontrol->value.enumerated.item[1] = item;
+        }
 
         return 0;
 }
@@ -2623,17 +2627,18 @@ int snd_soc_put_enum_double(struct snd_kcontrol *kcontrol,
 {
         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+        unsigned int *item = ucontrol->value.enumerated.item;
         unsigned int val;
         unsigned int mask;
 
-        if (ucontrol->value.enumerated.item[0] >= e->items)
+        if (item[0] >= e->items)
                 return -EINVAL;
-        val = ucontrol->value.enumerated.item[0] << e->shift_l;
+        val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
         mask = e->mask << e->shift_l;
         if (e->shift_l != e->shift_r) {
-                if (ucontrol->value.enumerated.item[1] >= e->items)
+                if (item[1] >= e->items)
                         return -EINVAL;
-                val |= ucontrol->value.enumerated.item[1] << e->shift_r;
+                val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_r;
                 mask |= e->mask << e->shift_r;
         }
 
@@ -2642,80 +2647,6 @@ int snd_soc_put_enum_double(struct snd_kcontrol *kcontrol,
 EXPORT_SYMBOL_GPL(snd_soc_put_enum_double);
 
 /**
- * snd_soc_get_value_enum_double - semi enumerated double mixer get callback
- * @kcontrol: mixer control
- * @ucontrol: control element information
- *
- * Callback to get the value of a double semi enumerated mixer.
- *
- * Semi enumerated mixer: the enumerated items are referred as values. Can be
- * used for handling bitfield coded enumeration for example.
- *
- * Returns 0 for success.
- */
-int snd_soc_get_value_enum_double(struct snd_kcontrol *kcontrol,
-        struct snd_ctl_elem_value *ucontrol)
-{
-        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-        unsigned int reg_val, val, mux;
-
-        reg_val = snd_soc_read(codec, e->reg);
-        val = (reg_val >> e->shift_l) & e->mask;
-        for (mux = 0; mux < e->items; mux++) {
-                if (val == e->values[mux])
-                        break;
-        }
-        ucontrol->value.enumerated.item[0] = mux;
-        if (e->shift_l != e->shift_r) {
-                val = (reg_val >> e->shift_r) & e->mask;
-                for (mux = 0; mux < e->items; mux++) {
-                        if (val == e->values[mux])
-                                break;
-                }
-                ucontrol->value.enumerated.item[1] = mux;
-        }
-
-        return 0;
-}
-EXPORT_SYMBOL_GPL(snd_soc_get_value_enum_double);
-
-/**
- * snd_soc_put_value_enum_double - semi enumerated double mixer put callback
- * @kcontrol: mixer control
- * @ucontrol: control element information
- *
- * Callback to set the value of a double semi enumerated mixer.
- *
- * Semi enumerated mixer: the enumerated items are referred as values. Can be
- * used for handling bitfield coded enumeration for example.
- *
- * Returns 0 for success.
- */
-int snd_soc_put_value_enum_double(struct snd_kcontrol *kcontrol,
-        struct snd_ctl_elem_value *ucontrol)
-{
-        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-        unsigned int val;
-        unsigned int mask;
-
-        if (ucontrol->value.enumerated.item[0] >= e->items)
-                return -EINVAL;
-        val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
-        mask = e->mask << e->shift_l;
-        if (e->shift_l != e->shift_r) {
-                if (ucontrol->value.enumerated.item[1] >= e->items)
-                        return -EINVAL;
-                val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
-                mask |= e->mask << e->shift_r;
-        }
-
-        return snd_soc_update_bits_locked(codec, e->reg, mask, val);
-}
-EXPORT_SYMBOL_GPL(snd_soc_put_value_enum_double);
-
-/**
  * snd_soc_read_signed - Read a codec register and interprete as signed value
  * @codec: codec
  * @reg: Register to read