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[ALSA] cmipci: document 'Modem' control version check

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Add a comment that explains why the 'Modem' control doesn't work with
newer chips.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Clemens Ladisch 2007-12-11 08:55:16 +01:00 committed by Jaroslav Kysela
parent 69a07304d5
commit 25543fa785
1 changed files with 4 additions and 0 deletions
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4
sound/pci/cmipci.c
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@ -2733,6 +2733,10 @@ static int __devinit snd_cmipci_mixer_new(struct cmipci *cm, int pcm_spdif_devic
}
/* card switches */
/*
* newer chips don't have the register bits to force modem link
* detection; the bit that was FLINKON now mutes CH1
*/
if (cm->chip_version < 39) {
err = snd_ctl_add(cm->card,
snd_ctl_new1(&snd_cmipci_modem_switch, cm));