Commit 395c61d1 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
Browse files

ALSA: via82xx: allow changing the initial DXS volume 



As per-stream volume controls, the DXS controls are not intended to
adjust the overall sound level and so are initialized every time
a stream is opened.  However, there are special situations where one
wants to reduce the overall volume in the digital domain, i.e., before
the AC'97 codec's PCM volume control.  To allow this, add a module
parameter that sets the initial DXS volume.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Tested-by: default avatarSoeren D. Schulze <soeren.d.schulze@gmx.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent d32d552e

sound/pci/via82xx.c

+7 −2
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ static int joystick; 
static int ac97_clock = 48000;

static char *ac97_quirk;

static int dxs_support;

static int dxs_init_volume = 31;

static int nodelay;



module_param(index, int, 0444);
@@ -103,6 +104,8 @@ module_param(ac97_quirk, charp, 0444); 
MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");

module_param(dxs_support, int, 0444);

MODULE_PARM_DESC(dxs_support, "Support for DXS channels (0 = auto, 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA, 5 = enable any sample rate)");

module_param(dxs_init_volume, int, 0644);

MODULE_PARM_DESC(dxs_init_volume, "initial DXS volume (0-31)");

module_param(nodelay, int, 0444);

MODULE_PARM_DESC(nodelay, "Disable 500ms init delay");
@@ -1245,8 +1248,10 @@ static int snd_via8233_playback_open(struct snd_pcm_substream *substream) 
		return err;

	stream = viadev->reg_offset / 0x10;

	if (chip->dxs_controls[stream]) {

		chip->playback_volume[stream][0] = 0;

		chip->playback_volume[stream][1] = 0;

		chip->playback_volume[stream][0] =

				VIA_DXS_MAX_VOLUME - (dxs_init_volume & 31);

		chip->playback_volume[stream][1] =

				VIA_DXS_MAX_VOLUME - (dxs_init_volume & 31);

		chip->dxs_controls[stream]->vd[0].access &=

			~SNDRV_CTL_ELEM_ACCESS_INACTIVE;

		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |

CRA Git | Maintained and supported by SUSTech CRA and CCSE