mirror of
https://github.com/torvalds/linux.git
synced 2026-05-28 00:53:34 +02:00
19cbb3e0c2
The InterWave STB variant uses a TEA6330T mixer on its private I2C bus. The mixer state is cached in software, but there is no helper to push that register image back to hardware after system resume. Add a small restore helper that reapplies the cached TEA6330T register image to the device so board drivers can restore the external mixer state as part of their PM resume path. Take snd_i2c_lock() around the full device lookup and restore sequence so the bus device list traversal is also protected. Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://patch.msgid.link/20260407-alsa-interwave-pm-v2-2-8dd96c6129e9@gmail.com
18 lines
525 B
C
18 lines
525 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
#ifndef __SOUND_TEA6330T_H
|
|
#define __SOUND_TEA6330T_H
|
|
|
|
/*
|
|
* Routines for control of TEA6330T circuit.
|
|
* Sound fader control circuit for car radios.
|
|
*/
|
|
|
|
#include <sound/i2c.h> /* generic i2c support */
|
|
|
|
int snd_tea6330t_detect(struct snd_i2c_bus *bus, int equalizer);
|
|
int snd_tea6330t_update_mixer(struct snd_card *card, struct snd_i2c_bus *bus,
|
|
int equalizer, int fader);
|
|
int snd_tea6330t_restore_mixer(struct snd_i2c_bus *bus);
|
|
|
|
#endif /* __SOUND_TEA6330T_H */
|