1 files changed, 65 insertions, 0 deletions

diff --git a/sound/pci/oxygen/oxygen.c b/sound/pci/oxygen/oxygen.c
index d12fd9efe94e..3ad9eb00aebd 100644
--- a/sound/pci/oxygen/oxygen.c
+++ b/sound/pci/oxygen/oxygen.c
@@ -352,6 +352,70 @@ static void set_ak5385_params(struct oxygen *chip,
                               value, GPIO_AK5385_DFS_MASK);
 }
 
+static int rolloff_info(struct snd_kcontrol *ctl,
+                        struct snd_ctl_elem_info *info)
+{
+        static const char *const names[2] = {
+                "Sharp Roll-off", "Slow Roll-off"
+        };
+
+        info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        info->count = 1;
+        info->value.enumerated.items = 2;
+        if (info->value.enumerated.item >= 2)
+                info->value.enumerated.item = 1;
+        strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
+        return 0;
+}
+
+static int rolloff_get(struct snd_kcontrol *ctl,
+                       struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+        struct generic_data *data = chip->model_data;
+
+        value->value.enumerated.item[0] =
+                (data->ak4396_regs[0][AK4396_CONTROL_2] & AK4396_SLOW) != 0;
+        return 0;
+}
+
+static int rolloff_put(struct snd_kcontrol *ctl,
+                       struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+        struct generic_data *data = chip->model_data;
+        unsigned int i;
+        int changed;
+        u8 reg;
+
+        mutex_lock(&chip->mutex);
+        reg = data->ak4396_regs[0][AK4396_CONTROL_2];
+        if (value->value.enumerated.item[0])
+                reg |= AK4396_SLOW;
+        else
+                reg &= ~AK4396_SLOW;
+        changed = reg != data->ak4396_regs[0][AK4396_CONTROL_2];
+        if (changed) {
+                for (i = 0; i < 4; ++i)
+                        ak4396_write(chip, i, AK4396_CONTROL_2, reg);
+        }
+        mutex_unlock(&chip->mutex);
+        return changed;
+}
+
+static const struct snd_kcontrol_new rolloff_control = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "DAC Filter Playback Enum",
+        .info = rolloff_info,
+        .get = rolloff_get,
+        .put = rolloff_put,
+};
+
+static int generic_mixer_init(struct oxygen *chip)
+{
+        return snd_ctl_add(chip->card, snd_ctl_new1(&rolloff_control, chip));
+}
+
 static const DECLARE_TLV_DB_LINEAR(ak4396_db_scale, TLV_DB_GAIN_MUTE, 0);
 
 static const struct oxygen_model model_generic = {
@@ -359,6 +423,7 @@ static const struct oxygen_model model_generic = {
         .longname = "C-Media Oxygen HD Audio",
         .chip = "CMI8788",
         .init = generic_init,
+        .mixer_init = generic_mixer_init,
         .cleanup = generic_cleanup,
         .resume = generic_resume,
         .get_i2s_mclk = oxygen_default_i2s_mclk,