[ALSA] virtuoso: add GPIO 1 mixer control

Add a mixer control for switching whatever it is that is connected to
GPIO pin 1 on the Xonar DX.

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

1 files changed, 53 insertions, 0 deletions

diff --git a/sound/pci/oxygen/virtuoso.c b/sound/pci/oxygen/virtuoso.c
index 07d7e9b6afbb..53d7289f21c0 100644
--- a/sound/pci/oxygen/virtuoso.c
+++ b/sound/pci/oxygen/virtuoso.c
@@ -470,6 +470,53 @@ static const struct snd_kcontrol_new alt_switch = {
         .put = alt_switch_put,
 };
 
+static int unknown_info(struct snd_kcontrol *ctl,
+                        struct snd_ctl_elem_info *info)
+{
+        info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        info->count = 1;
+        info->value.enumerated.items = 2;
+        if (info->value.enumerated.item > 1)
+                info->value.enumerated.item = 1;
+        sprintf(info->value.enumerated.name, "%u", info->value.enumerated.item);
+        return 0;
+}
+
+static int unknown_get(struct snd_kcontrol *ctl,
+                       struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+
+        value->value.enumerated.item[0] =
+                !!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & GPIO_DX_UNKNOWN1);
+        return 0;
+}
+
+static int unknown_put(struct snd_kcontrol *ctl,
+                       struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+        u16 old_reg, new_reg;
+
+        spin_lock_irq(&chip->reg_lock);
+        old_reg = oxygen_read16(chip, OXYGEN_GPIO_DATA);
+        if (value->value.enumerated.item[0])
+                new_reg = old_reg | GPIO_DX_UNKNOWN1;
+        else
+                new_reg = old_reg & ~GPIO_DX_UNKNOWN1;
+        oxygen_write16(chip, OXYGEN_GPIO_DATA, new_reg);
+        spin_unlock_irq(&chip->reg_lock);
+        return old_reg != new_reg;
+}
+
+static const struct snd_kcontrol_new unknown_switch = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "PanelConfig?",
+        .info = unknown_info,
+        .get = unknown_get,
+        .put = unknown_put,
+};
+
 static void xonar_dx_ac97_switch(struct oxygen *chip,
                                  unsigned int reg, unsigned int mute)
 {
@@ -515,6 +562,11 @@ static int xonar_mixer_init(struct oxygen *chip)
         return snd_ctl_add(chip->card, snd_ctl_new1(&alt_switch, chip));
 }
 
+static int xonar_dx_mixer_init(struct oxygen *chip)
+{
+        return snd_ctl_add(chip->card, snd_ctl_new1(&unknown_switch, chip));
+}
+
 static const struct oxygen_model xonar_models[] = {
         [MODEL_D2] = {
                 .shortname = "Xonar D2",
@@ -574,6 +626,7 @@ static const struct oxygen_model xonar_models[] = {
                 .owner = THIS_MODULE,
                 .init = xonar_dx_init,
                 .control_filter = xonar_dx_control_filter,
+                .mixer_init = xonar_dx_mixer_init,
                 .cleanup = xonar_dx_cleanup,
                 .set_dac_params = set_cs43xx_params,
                 .set_adc_params = set_cs53x1_params,