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ALSA: virtuoso: Xonar DS: add stereo upmixing to center/LFE channels 

Add the possibility to route a mix of the two channels of stereo data to
the center and LFE outputs.  Due to a WM8766 restriction, all surround
and back channels also get the mixed L/R signal in this case.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2010-09-09 12:24:35 +02:00 committed by Takashi Iwai
parent 84cf83a28d
commit 2dbf0ea29c
1 changed files with 19 additions and 0 deletions
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19
sound/pci/oxygen/xonar_wm87x6.c
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@ -377,6 +377,24 @@ static void update_wm87x6_mute(struct oxygen *chip)
(chip->dac_mute ? WM8766_DMUTE_MASK : 0));
}
static void update_wm8766_center_lfe_mix(struct oxygen *chip, bool mixed)
{
struct xonar_wm87x6 *data = chip->model_data;
unsigned int reg;
/*
* The WM8766 can mix left and right channels, but this setting
* applies to all three stereo pairs.
*/
reg = data->wm8766_regs[WM8766_DAC_CTRL] &
~(WM8766_PL_LEFT_MASK | WM8766_PL_RIGHT_MASK);
if (mixed)
reg |= WM8766_PL_LEFT_LRMIX | WM8766_PL_RIGHT_LRMIX;
else
reg |= WM8766_PL_LEFT_LEFT | WM8766_PL_RIGHT_RIGHT;
wm8766_write_cached(chip, WM8766_DAC_CTRL, reg);
}
static void xonar_ds_gpio_changed(struct oxygen *chip)
{
xonar_ds_handle_hp_jack(chip);
@ -1067,6 +1085,7 @@ static const struct oxygen_model model_xonar_ds = {
.set_adc_params = set_wm8776_adc_params,
.update_dac_volume = update_wm87x6_volume,
.update_dac_mute = update_wm87x6_mute,
.update_center_lfe_mix = update_wm8766_center_lfe_mix,
.gpio_changed = xonar_ds_gpio_changed,
.dac_tlv = wm87x6_dac_db_scale,
.model_data_size = sizeof(struct xonar_wm87x6),