ALSA: virtuoso: add HDMI enable switch for HDAV1.3

The GPIO bit that enables analog output on the Xonar HDAV1.3 also
disables the HDMI audio output, so we better add a switch for it.
Hopefully, this is sufficient to make the HDMI output work.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/Kconfig

@@ -817,7 +817,7 @@ config SND_VIRTUOSO
 	  Say Y here to include support for sound cards based on the
 	  Asus AV66/AV100/AV200 chips, i.e., Xonar D1, DX, D2, D2X, DS,
 	  Essence ST (Deluxe), and Essence STX.
-	  Support for the HDAV1.3 (Deluxe) is incomplete; for the
+	  Support for the HDAV1.3 (Deluxe) is experimental; for the
 	  HDAV1.3 Slim and Xense, missing.
 
 	  To compile this driver as a module, choose M here: the module

sound/pci/oxygen/xonar.h

@@ -24,6 +24,8 @@ void xonar_init_ext_power(struct oxygen *chip);
 void xonar_init_cs53x1(struct oxygen *chip);
 void xonar_set_cs53x1_params(struct oxygen *chip,
 			     struct snd_pcm_hw_params *params);
+
+#define XONAR_GPIO_BIT_INVERT	(1 << 16)
 int xonar_gpio_bit_switch_get(struct snd_kcontrol *ctl,
 			      struct snd_ctl_elem_value *value);
 int xonar_gpio_bit_switch_put(struct snd_kcontrol *ctl,

sound/pci/oxygen/xonar_lib.c

@@ -104,9 +104,10 @@ int xonar_gpio_bit_switch_get(struct snd_kcontrol *ctl,
 {
 	struct oxygen *chip = ctl->private_data;
 	u16 bit = ctl->private_value;
+	bool invert = ctl->private_value & XONAR_GPIO_BIT_INVERT;
 
 	value->value.integer.value[0] =
-		!!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & bit);
+		!!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & bit) ^ invert;
 	return 0;
 }
 
@@ -115,12 +116,13 @@ int xonar_gpio_bit_switch_put(struct snd_kcontrol *ctl,
 {
 	struct oxygen *chip = ctl->private_data;
 	u16 bit = ctl->private_value;
+	bool invert = ctl->private_value & XONAR_GPIO_BIT_INVERT;
 	u16 old_bits, new_bits;
 	int changed;
 
 	spin_lock_irq(&chip->reg_lock);
 	old_bits = oxygen_read16(chip, OXYGEN_GPIO_DATA);
-	if (value->value.integer.value[0])
+	if (!!value->value.integer.value[0] ^ invert)
 		new_bits = old_bits | bit;
 	else
 		new_bits = old_bits & ~bit;

sound/pci/oxygen/xonar_pcm179x.c

@@ -776,6 +776,15 @@ static const struct snd_kcontrol_new os_128_control = {
 	.put = os_128_put,
 };
 
+static const struct snd_kcontrol_new hdav_hdmi_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "HDMI Playback Switch",
+	.info = snd_ctl_boolean_mono_info,
+	.get = xonar_gpio_bit_switch_get,
+	.put = xonar_gpio_bit_switch_put,
+	.private_value = GPIO_HDAV_OUTPUT_ENABLE | XONAR_GPIO_BIT_INVERT,
+};
+
 static int st_output_switch_info(struct snd_kcontrol *ctl,
 				 struct snd_ctl_elem_info *info)
 {
@@ -960,7 +969,15 @@ static int xonar_d2_mixer_init(struct oxygen *chip)
 
 static int xonar_hdav_mixer_init(struct oxygen *chip)
 {
-	return add_pcm1796_controls(chip);
+	int err;
+
+	err = snd_ctl_add(chip->card, snd_ctl_new1(&hdav_hdmi_control, chip));
+	if (err < 0)
+		return err;
+	err = add_pcm1796_controls(chip);
+	if (err < 0)
+		return err;
+	return 0;
 }
 
 static int xonar_st_mixer_init(struct oxygen *chip)