[ALSA] oxygen: make the number of analog output configurable

Add a field to struct oxygen_model to allow model drivers for cards with
less than eight output channels.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/oxygen/oxygen.c

@@ -350,6 +350,7 @@ static const struct oxygen_model model_generic = {
 	.update_dac_volume = update_ak4396_volume,
 	.update_dac_mute = update_ak4396_mute,
 	.model_data_size = sizeof(struct generic_data),
+	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_A |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |
@@ -372,6 +373,7 @@ static const struct oxygen_model model_meridian = {
 	.update_dac_volume = update_ak4396_volume,
 	.update_dac_mute = update_ak4396_mute,
 	.model_data_size = sizeof(struct generic_data),
+	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_B |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |

sound/pci/oxygen/oxygen.h

@@ -85,6 +85,7 @@ struct oxygen_model {
 	void (*update_dac_volume)(struct oxygen *chip);
 	void (*update_dac_mute)(struct oxygen *chip);
 	size_t model_data_size;
+	u8 dac_channels;
 	u8 used_channels;
 	u8 function_flags;
 	u16 dac_i2s_format;

sound/pci/oxygen/oxygen_mixer.c

@@ -28,8 +28,10 @@
 static int dac_volume_info(struct snd_kcontrol *ctl,
 			   struct snd_ctl_elem_info *info)
 {
+	struct oxygen *chip = ctl->private_data;
+
 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
-	info->count = 8;
+	info->count = chip->model->dac_channels;
 	info->value.integer.min = 0;
 	info->value.integer.max = 0xff;
 	return 0;
@@ -42,7 +44,7 @@ static int dac_volume_get(struct snd_kcontrol *ctl,
 	unsigned int i;
 
 	mutex_lock(&chip->mutex);
-	for (i = 0; i < 8; ++i)
+	for (i = 0; i < chip->model->dac_channels; ++i)
 		value->value.integer.value[i] = chip->dac_volume[i];
 	mutex_unlock(&chip->mutex);
 	return 0;
@@ -57,7 +59,7 @@ static int dac_volume_put(struct snd_kcontrol *ctl,
 
 	changed = 0;
 	mutex_lock(&chip->mutex);
-	for (i = 0; i < 8; ++i)
+	for (i = 0; i < chip->model->dac_channels; ++i)
 		if (value->value.integer.value[i] != chip->dac_volume[i]) {
 			chip->dac_volume[i] = value->value.integer.value[i];
 			changed = 1;
@@ -100,11 +102,14 @@ static int upmix_info(struct snd_kcontrol *ctl, struct snd_ctl_elem_info *info)
 	static const char *const names[3] = {
 		"Front", "Front+Surround", "Front+Surround+Back"
 	};
+	struct oxygen *chip = ctl->private_data;
+	unsigned int count = 2 + (chip->model->dac_channels == 8);
+
 	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;
+	info->value.enumerated.items = count;
+	if (info->value.enumerated.item >= count)
+		info->value.enumerated.item = count - 1;
 	strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
 	return 0;
 }
@@ -167,12 +172,14 @@ void oxygen_update_dac_routing(struct oxygen *chip)
 static int upmix_put(struct snd_kcontrol *ctl, struct snd_ctl_elem_value *value)
 {
 	struct oxygen *chip = ctl->private_data;
+	unsigned int count = 2 + (chip->model->dac_channels == 8);
 	int changed;
 
 	mutex_lock(&chip->mutex);
 	changed = value->value.enumerated.item[0] != chip->dac_routing;
 	if (changed) {
-		chip->dac_routing = min(value->value.enumerated.item[0], 2u);
+		chip->dac_routing = min(value->value.enumerated.item[0],
+					count - 1);
 		spin_lock_irq(&chip->reg_lock);
 		oxygen_update_dac_routing(chip);
 		spin_unlock_irq(&chip->reg_lock);

sound/pci/oxygen/oxygen_pcm.c

@@ -119,10 +119,15 @@ static int oxygen_open(struct snd_pcm_substream *substream,
 
 	runtime->private_data = (void *)(uintptr_t)channel;
 	runtime->hw = *oxygen_hardware[channel];
-	if (channel == PCM_C) {
+	switch (channel) {
+	case PCM_C:
 		runtime->hw.rates &= ~(SNDRV_PCM_RATE_32000 |
 				       SNDRV_PCM_RATE_64000);
 		runtime->hw.rate_min = 44100;
+		break;
+	case PCM_MULTICH:
+		runtime->hw.channels_max = chip->model->dac_channels;
+		break;
 	}
 	if (chip->model->pcm_hardware_filter)
 		chip->model->pcm_hardware_filter(channel, &runtime->hw);

sound/pci/oxygen/virtuoso.c

@@ -310,6 +310,7 @@ static const struct oxygen_model model_xonar = {
 	.set_adc_params = set_cs5381_params,
 	.update_dac_volume = update_pcm1796_volume,
 	.update_dac_mute = update_pcm1796_mute,
+	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_B |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |