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| author | Takashi Iwai <tiwai@suse.de> | 2006-06-27 18:28:53 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-09-23 10:37:08 +0200 |
| commit | 6dbe662874ba08585eaf732d126762c25ac8e3f7 (patch) | |
| tree | 7460c36d4d848f223b682f7a700866bcf6dbc7d5 /include/sound | |
| parent | 2b29b13c5794f648cd5e839796496704d787f5a6 (diff) | |
| download | linux-6dbe662874ba08585eaf732d126762c25ac8e3f7.tar.gz | |
[ALSA] Add experimental support of aggressive AC97 power-saving mode
Added CONFIG_SND_AC97_POWER_SAVE kernel config to enable the support
of aggressive AC97 power-saving mode. In this mode, the AC97
powerdown register bits are dynamically controlled at each open/close
of PCM streams.
The mode is activated via power_save option for snd-ac97-codec
driver. As default it's off. It can be turned on/off on the fly
via sysfs, too.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/ac97_codec.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h index 758f8bf133c7..4c43521cc493 100644 --- a/include/sound/ac97_codec.h +++ b/include/sound/ac97_codec.h @@ -27,6 +27,7 @@ #include <linux/bitops.h> #include <linux/device.h> +#include <linux/workqueue.h> #include "pcm.h" #include "control.h" #include "info.h" @@ -140,6 +141,20 @@ #define AC97_GP_DRSS_1011 0x0000 /* LR(C) 10+11(+12) */ #define AC97_GP_DRSS_78 0x0400 /* LR 7+8 */ +/* powerdown bits */ +#define AC97_PD_ADC_STATUS 0x0001 /* ADC status (RO) */ +#define AC97_PD_DAC_STATUS 0x0002 /* DAC status (RO) */ +#define AC97_PD_MIXER_STATUS 0x0004 /* Analog mixer status (RO) */ +#define AC97_PD_VREF_STATUS 0x0008 /* Vref status (RO) */ +#define AC97_PD_PR0 0x0100 /* Power down PCM ADCs and input MUX */ +#define AC97_PD_PR1 0x0200 /* Power down PCM front DAC */ +#define AC97_PD_PR2 0x0400 /* Power down Mixer (Vref still on) */ +#define AC97_PD_PR3 0x0800 /* Power down Mixer (Vref off) */ +#define AC97_PD_PR4 0x1000 /* Power down AC-Link */ +#define AC97_PD_PR5 0x2000 /* Disable internal clock usage */ +#define AC97_PD_PR6 0x4000 /* Headphone amplifier */ +#define AC97_PD_EAPD 0x8000 /* External Amplifer Power Down (EAPD) */ + /* extended audio ID bit defines */ #define AC97_EI_VRA 0x0001 /* Variable bit rate supported */ #define AC97_EI_DRA 0x0002 /* Double rate supported */ @@ -359,6 +374,7 @@ #define AC97_SCAP_INV_EAPD (1<<7) /* inverted EAPD */ #define AC97_SCAP_DETECT_BY_VENDOR (1<<8) /* use vendor registers for read tests */ #define AC97_SCAP_NO_SPDIF (1<<9) /* don't build SPDIF controls */ +#define AC97_SCAP_EAPD_LED (1<<10) /* EAPD as mute LED */ /* ac97->flags */ #define AC97_HAS_PC_BEEP (1<<0) /* force PC Speaker usage */ @@ -491,6 +507,12 @@ struct snd_ac97 { /* jack-sharing info */ unsigned char indep_surround; unsigned char channel_mode; + +#ifdef CONFIG_SND_AC97_POWER_SAVE + unsigned int power_up; /* power states */ + struct workqueue_struct *power_workq; + struct work_struct power_work; +#endif struct device dev; }; @@ -532,6 +554,15 @@ unsigned short snd_ac97_read(struct snd_ac97 *ac97, unsigned short reg); void snd_ac97_write_cache(struct snd_ac97 *ac97, unsigned short reg, unsigned short value); int snd_ac97_update(struct snd_ac97 *ac97, unsigned short reg, unsigned short value); int snd_ac97_update_bits(struct snd_ac97 *ac97, unsigned short reg, unsigned short mask, unsigned short value); +#ifdef CONFIG_SND_AC97_POWER_SAVE +int snd_ac97_update_power(struct snd_ac97 *ac97, int reg, int powerup); +#else +static inline int snd_ac97_update_power(struct snd_ac97 *ac97, int reg, + int powerup) +{ + return 0; +} +#endif #ifdef CONFIG_PM void snd_ac97_suspend(struct snd_ac97 *ac97); void snd_ac97_resume(struct snd_ac97 *ac97); @@ -583,6 +614,7 @@ struct ac97_pcm { copy_flag: 1, /* lowlevel driver must fill all entries */ spdif: 1; /* spdif pcm */ unsigned short aslots; /* active slots */ + unsigned short cur_dbl; /* current double-rate state */ unsigned int rates; /* available rates */ struct { unsigned short slots; /* driver input: requested AC97 slot numbers */ |