ASoC: TWL4030: Add helper function for output gain controls

Some of the gain controls in TWL (mostly those which are associated with
the outputs) are implemented in an interesting way:
 0x0 : Power down (mute)
 0x1 : 6dB
 0x2 : 0 dB
 0x3 : -6 dB
Inverting not going to help with these.
Custom volsw and volsw_2r get/put functions to handle these gains.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 91effd341c0b..413623147891 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -191,6 +191,163 @@ static void twl4030_init_chip(struct snd_soc_codec *codec)
 }
 
 /*
+ * Some of the gain controls in TWL (mostly those which are associated with
+ * the outputs) are implemented in an interesting way:
+ * 0x0 : Power down (mute)
+ * 0x1 : 6dB
+ * 0x2 : 0 dB
+ * 0x3 : -6 dB
+ * Inverting not going to help with these.
+ * Custom volsw and volsw_2r get/put functions to handle these gain bits.
+ */
+#define SOC_DOUBLE_TLV_TWL4030(xname, xreg, shift_left, shift_right, xmax,\
+                               xinvert, tlv_array) \
+{       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname),\
+        .access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
+                 SNDRV_CTL_ELEM_ACCESS_READWRITE,\
+        .tlv.p = (tlv_array), \
+        .info = snd_soc_info_volsw, \
+        .get = snd_soc_get_volsw_twl4030, \
+        .put = snd_soc_put_volsw_twl4030, \
+        .private_value = (unsigned long)&(struct soc_mixer_control) \
+                {.reg = xreg, .shift = shift_left, .rshift = shift_right,\
+                 .max = xmax, .invert = xinvert} }
+#define SOC_DOUBLE_R_TLV_TWL4030(xname, reg_left, reg_right, xshift, xmax,\
+                                 xinvert, tlv_array) \
+{       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname),\
+        .access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
+                 SNDRV_CTL_ELEM_ACCESS_READWRITE,\
+        .tlv.p = (tlv_array), \
+        .info = snd_soc_info_volsw_2r, \
+        .get = snd_soc_get_volsw_r2_twl4030,\
+        .put = snd_soc_put_volsw_r2_twl4030, \
+        .private_value = (unsigned long)&(struct soc_mixer_control) \
+                {.reg = reg_left, .rreg = reg_right, .shift = xshift, \
+                .max = xmax, .invert = xinvert} }
+#define SOC_SINGLE_TLV_TWL4030(xname, xreg, xshift, xmax, xinvert, tlv_array) \
+        SOC_DOUBLE_TLV_TWL4030(xname, xreg, xshift, xshift, xmax, \
+                               xinvert, tlv_array)
+
+static int snd_soc_get_volsw_twl4030(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int reg = mc->reg;
+        unsigned int shift = mc->shift;
+        unsigned int rshift = mc->rshift;
+        int max = mc->max;
+        int mask = (1 << fls(max)) - 1;
+
+        ucontrol->value.integer.value[0] =
+                (snd_soc_read(codec, reg) >> shift) & mask;
+        if (ucontrol->value.integer.value[0])
+                ucontrol->value.integer.value[0] =
+                        max + 1 - ucontrol->value.integer.value[0];
+
+        if (shift != rshift) {
+                ucontrol->value.integer.value[1] =
+                        (snd_soc_read(codec, reg) >> rshift) & mask;
+                if (ucontrol->value.integer.value[1])
+                        ucontrol->value.integer.value[1] =
+                                max + 1 - ucontrol->value.integer.value[1];
+        }
+
+        return 0;
+}
+
+static int snd_soc_put_volsw_twl4030(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int reg = mc->reg;
+        unsigned int shift = mc->shift;
+        unsigned int rshift = mc->rshift;
+        int max = mc->max;
+        int mask = (1 << fls(max)) - 1;
+        unsigned short val, val2, val_mask;
+
+        val = (ucontrol->value.integer.value[0] & mask);
+
+        val_mask = mask << shift;
+        if (val)
+                val = max + 1 - val;
+        val = val << shift;
+        if (shift != rshift) {
+                val2 = (ucontrol->value.integer.value[1] & mask);
+                val_mask |= mask << rshift;
+                if (val2)
+                        val2 = max + 1 - val2;
+                val |= val2 << rshift;
+        }
+        return snd_soc_update_bits(codec, reg, val_mask, val);
+}
+
+static int snd_soc_get_volsw_r2_twl4030(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int reg = mc->reg;
+        unsigned int reg2 = mc->rreg;
+        unsigned int shift = mc->shift;
+        int max = mc->max;
+        int mask = (1<<fls(max))-1;
+
+        ucontrol->value.integer.value[0] =
+                (snd_soc_read(codec, reg) >> shift) & mask;
+        ucontrol->value.integer.value[1] =
+                (snd_soc_read(codec, reg2) >> shift) & mask;
+
+        if (ucontrol->value.integer.value[0])
+                ucontrol->value.integer.value[0] =
+                        max + 1 - ucontrol->value.integer.value[0];
+        if (ucontrol->value.integer.value[1])
+                ucontrol->value.integer.value[1] =
+                        max + 1 - ucontrol->value.integer.value[1];
+
+        return 0;
+}
+
+static int snd_soc_put_volsw_r2_twl4030(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int reg = mc->reg;
+        unsigned int reg2 = mc->rreg;
+        unsigned int shift = mc->shift;
+        int max = mc->max;
+        int mask = (1 << fls(max)) - 1;
+        int err;
+        unsigned short val, val2, val_mask;
+
+        val_mask = mask << shift;
+        val = (ucontrol->value.integer.value[0] & mask);
+        val2 = (ucontrol->value.integer.value[1] & mask);
+
+        if (val)
+                val = max + 1 - val;
+        if (val2)
+                val2 = max + 1 - val2;
+
+        val = val << shift;
+        val2 = val2 << shift;
+
+        err = snd_soc_update_bits(codec, reg, val_mask, val);
+        if (err < 0)
+                return err;
+
+        err = snd_soc_update_bits(codec, reg2, val_mask, val2);
+        return err;
+}
+
+/*
  * FGAIN volume control:
  * from -62 to 0 dB in 1 dB steps (mute instead of -63 dB)
  */