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ALSA: hda - Add sanity check of vmaster slave dB steps 

Check whether all vmaster slaves have the same dB steps.  Otherwise
the behavior would become inconsistent.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2013-11-04 15:51:00 +01:00
parent a4e7a12168
commit 485e3e0cdf
1 changed files with 12 additions and 4 deletions
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16
sound/pci/hda/hda_codec.c
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@ -2661,7 +2661,7 @@ static int check_slave_present(void *data, struct snd_kcontrol *sctl)
}
/* guess the value corresponding to 0dB */
static int get_kctl_0dB_offset(struct snd_kcontrol *kctl)
static int get_kctl_0dB_offset(struct snd_kcontrol *kctl, int *step_to_check)
{
int _tlv[4];
const int *tlv = NULL;
@ -2681,6 +2681,12 @@ static int get_kctl_0dB_offset(struct snd_kcontrol *kctl)
step &= ~TLV_DB_SCALE_MUTE;
if (!step)
return -1;
if (*step_to_check && *step_to_check != step) {
snd_printk(KERN_ERR "hda_codec: Mismatching dB step for vmaster slave (%d!=%d)\n",
*step_to_check, step);
return -1;
}
*step_to_check = step;
val = -tlv[2] / step;
}
return val;
@ -2703,7 +2709,7 @@ static int put_kctl_with_value(struct snd_kcontrol *kctl, int val)
/* initialize the slave volume with 0dB */
static int init_slave_0dB(void *data, struct snd_kcontrol *slave)
{
int offset = get_kctl_0dB_offset(slave);
int offset = get_kctl_0dB_offset(slave, data);
if (offset > 0)
put_kctl_with_value(slave, offset);
return 0;
@ -2764,9 +2770,11 @@ int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
/* init with master mute & zero volume */
put_kctl_with_value(kctl, 0);
if (init_slave_vol)
if (init_slave_vol) {
int step = 0;
map_slaves(codec, slaves, suffix,
tlv ? init_slave_0dB : init_slave_unmute, kctl);
tlv ? init_slave_0dB : init_slave_unmute, &step);
}
if (ctl_ret)
*ctl_ret = kctl;