sound: virtuoso: add headphone impedance control

Add a mixer control to adjust the headphone amplifier output for
headphones with different impedances.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 99 insertions, 11 deletions

diff --git a/sound/pci/oxygen/xonar_pcm179x.c b/sound/pci/oxygen/xonar_pcm179x.c
index e17ee5e8e510..cf94e4432a3f 100644
--- a/sound/pci/oxygen/xonar_pcm179x.c
+++ b/sound/pci/oxygen/xonar_pcm179x.c
@@ -173,6 +173,8 @@ struct xonar_pcm179x {
         struct xonar_generic generic;
         unsigned int dacs;
         u8 pcm1796_regs[4][5];
+        bool hp_active;
+        s8 hp_gain_offset;
         u8 cs2000_fun_cfg_1;
 };
 
@@ -249,13 +251,17 @@ static void pcm1796_registers_init(struct oxygen *chip)
 {
         struct xonar_pcm179x *data = chip->model_data;
         unsigned int i;
+        s8 gain_offset;
 
+        gain_offset = data->hp_active ? data->hp_gain_offset : 0;
         for (i = 0; i < data->dacs; ++i) {
                 /* set ATLD before ATL/ATR */
                 pcm1796_write(chip, i, 18,
                               data->pcm1796_regs[0][18 - PCM1796_REG_BASE]);
-                pcm1796_write(chip, i, 16, chip->dac_volume[i * 2]);
-                pcm1796_write(chip, i, 17, chip->dac_volume[i * 2 + 1]);
+                pcm1796_write(chip, i, 16, chip->dac_volume[i * 2]
+                              + gain_offset);
+                pcm1796_write(chip, i, 17, chip->dac_volume[i * 2 + 1]
+                              + gain_offset);
                 pcm1796_write(chip, i, 19, PCM1796_FLT_SHARP | PCM1796_ATS_1);
                 pcm1796_write(chip, i, 20,
                               data->pcm1796_regs[0][20 - PCM1796_REG_BASE]);
@@ -352,6 +358,7 @@ static void xonar_st_init_common(struct oxygen *chip)
         data->generic.anti_pop_delay = 100;
         data->generic.output_enable_bit = GPIO_ST_OUTPUT_ENABLE;
         data->dacs = chip->model.private_data ? 4 : 1;
+        data->hp_gain_offset = 2*-18;
 
         pcm1796_init(chip);
 
@@ -495,10 +502,14 @@ static void update_pcm1796_volume(struct oxygen *chip)
 {
         struct xonar_pcm179x *data = chip->model_data;
         unsigned int i;
+        s8 gain_offset;
 
+        gain_offset = data->hp_active ? data->hp_gain_offset : 0;
         for (i = 0; i < data->dacs; ++i) {
-                pcm1796_write_cached(chip, i, 16, chip->dac_volume[i * 2]);
-                pcm1796_write_cached(chip, i, 17, chip->dac_volume[i * 2 + 1]);
+                pcm1796_write_cached(chip, i, 16, chip->dac_volume[i * 2]
+                                     + gain_offset);
+                pcm1796_write_cached(chip, i, 17, chip->dac_volume[i * 2 + 1]
+                                     + gain_offset);
         }
 }
 
@@ -606,6 +617,7 @@ static int st_output_switch_put(struct snd_kcontrol *ctl,
                                 struct snd_ctl_elem_value *value)
 {
         struct oxygen *chip = ctl->private_data;
+        struct xonar_pcm179x *data = chip->model_data;
         u16 gpio_old, gpio;
 
         mutex_lock(&chip->mutex);
@@ -623,16 +635,83 @@ static int st_output_switch_put(struct snd_kcontrol *ctl,
                 break;
         }
         oxygen_write16(chip, OXYGEN_GPIO_DATA, gpio);
+        data->hp_active = gpio & GPIO_ST_HP;
+        update_pcm1796_volume(chip);
         mutex_unlock(&chip->mutex);
         return gpio != gpio_old;
 }
 
-static const struct snd_kcontrol_new st_output_switch = {
-        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-        .name = "Analog Output",
-        .info = st_output_switch_info,
-        .get = st_output_switch_get,
-        .put = st_output_switch_put,
+static int st_hp_volume_offset_info(struct snd_kcontrol *ctl,
+                                    struct snd_ctl_elem_info *info)
+{
+        static const char *const names[3] = {
+                "< 64 ohms", "64-300 ohms", "300-600 ohms"
+        };
+
+        info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        info->count = 1;
+        info->value.enumerated.items = 3;
+        if (info->value.enumerated.item > 2)
+                info->value.enumerated.item = 2;
+        strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
+        return 0;
+}
+
+static int st_hp_volume_offset_get(struct snd_kcontrol *ctl,
+                                   struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+        struct xonar_pcm179x *data = chip->model_data;
+
+        mutex_lock(&chip->mutex);
+        if (data->hp_gain_offset < 2*-6)
+                value->value.enumerated.item[0] = 0;
+        else if (data->hp_gain_offset < 0)
+                value->value.enumerated.item[0] = 1;
+        else
+                value->value.enumerated.item[0] = 2;
+        mutex_unlock(&chip->mutex);
+        return 0;
+}
+
+
+static int st_hp_volume_offset_put(struct snd_kcontrol *ctl,
+                                   struct snd_ctl_elem_value *value)
+{
+        static const s8 offsets[] = { 2*-18, 2*-6, 0 };
+        struct oxygen *chip = ctl->private_data;
+        struct xonar_pcm179x *data = chip->model_data;
+        s8 offset;
+        int changed;
+
+        if (value->value.enumerated.item[0] > 2)
+                return -EINVAL;
+        offset = offsets[value->value.enumerated.item[0]];
+        mutex_lock(&chip->mutex);
+        changed = offset != data->hp_gain_offset;
+        if (changed) {
+                data->hp_gain_offset = offset;
+                update_pcm1796_volume(chip);
+        }
+        mutex_unlock(&chip->mutex);
+        return changed;
+}
+
+static const struct snd_kcontrol_new st_controls[] = {
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Analog Output",
+                .info = st_output_switch_info,
+                .get = st_output_switch_get,
+                .put = st_output_switch_put,
+        },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Headphones Impedance Playback Enum",
+                .info = st_hp_volume_offset_info,
+                .get = st_hp_volume_offset_get,
+                .put = st_hp_volume_offset_put,
+        },
 };
 
 static void xonar_line_mic_ac97_switch(struct oxygen *chip,
@@ -671,7 +750,16 @@ static int xonar_d2_mixer_init(struct oxygen *chip)
 
 static int xonar_st_mixer_init(struct oxygen *chip)
 {
-        return snd_ctl_add(chip->card, snd_ctl_new1(&st_output_switch, chip));
+        unsigned int i;
+        int err;
+
+        for (i = 0; i < ARRAY_SIZE(st_controls); ++i) {
+                err = snd_ctl_add(chip->card,
+                                  snd_ctl_new1(&st_controls[i], chip));
+                if (err < 0)
+                        return err;
+        }
+        return 0;
 }
 
 static const struct oxygen_model model_xonar_d2 = {