#ifndef _AC97_CODEC_H_
#define _AC97_CODEC_H_


/* AC97 1.0 */
#define  AC97_RESET               0x0000      //
#define  AC97_MASTER_VOL_STEREO   0x0002      // Line Out
#define  AC97_HEADPHONE_VOL       0x0004      // 
#define  AC97_MASTER_VOL_MONO     0x0006      // TAD Output
#define  AC97_MASTER_TONE         0x0008      //
#define  AC97_PCBEEP_VOL          0x000a      // none
#define  AC97_PHONE_VOL           0x000c      // TAD Input (mono)
#define  AC97_MIC_VOL             0x000e      // MIC Input (mono)
#define  AC97_LINEIN_VOL          0x0010      // Line Input (stereo)
#define  AC97_CD_VOL              0x0012      // CD Input (stereo)
#define  AC97_VIDEO_VOL           0x0014      // none
#define  AC97_AUX_VOL             0x0016      // Aux Input (stereo)
#define  AC97_PCMOUT_VOL          0x0018      // Wave Output (stereo)
#define  AC97_RECORD_SELECT       0x001a      //
#define  AC97_RECORD_GAIN         0x001c
#define  AC97_RECORD_GAIN_MIC     0x001e
#define  AC97_GENERAL_PURPOSE     0x0020
#define  AC97_3D_CONTROL          0x0022
#define  AC97_MODEM_RATE          0x0024
#define  AC97_POWER_CONTROL       0x0026

/* AC'97 2.0 */
#define AC97_EXTENDED_ID          0x0028       /* Extended Audio ID */
#define AC97_EXTENDED_STATUS      0x002A       /* Extended Audio Status */
#define AC97_PCM_FRONT_DAC_RATE   0x002C       /* PCM Front DAC Rate */
#define AC97_PCM_SURR_DAC_RATE    0x002E       /* PCM Surround DAC Rate */
#define AC97_PCM_LFE_DAC_RATE     0x0030       /* PCM LFE DAC Rate */
#define AC97_PCM_LR_DAC_RATE      0x0032       /* PCM LR DAC Rate */
#define AC97_PCM_MIC_ADC_RATE     0x0034       /* PCM MIC ADC Rate */
#define AC97_CENTER_LFE_MASTER    0x0036       /* Center + LFE Master Volume */
#define AC97_SURROUND_MASTER      0x0038       /* Surround (Rear) Master Volume */
#define AC97_RESERVED_3A          0x003A       /* Reserved */

/* range 0x3c-0x58 - MODEM */

/* registers 0x005a - 0x007a are vendor reserved */

#define AC97_VENDOR_ID1           0x007c
#define AC97_VENDOR_ID2           0x007e

/* volume control bit defines */
#define AC97_MUTE                 0x8000
#define AC97_MICBOOST             0x0040
#define AC97_LEFTVOL              0x3f00
#define AC97_RIGHTVOL             0x003f

/* record mux defines */
#define AC97_RECMUX_MIC           0x0000
#define AC97_RECMUX_CD            0x0101
#define AC97_RECMUX_VIDEO         0x0202       /* not used */
#define AC97_RECMUX_AUX           0x0303      
#define AC97_RECMUX_LINE          0x0404      
#define AC97_RECMUX_STEREO_MIX    0x0505
#define AC97_RECMUX_MONO_MIX      0x0606
#define AC97_RECMUX_PHONE         0x0707


/* general purpose register bit defines */
#define AC97_GP_LPBK              0x0080       /* Loopback mode */
#define AC97_GP_MS                0x0100       /* Mic Select 0=Mic1, 1=Mic2 */
#define AC97_GP_MIX               0x0200       /* Mono output select 0=Mix, 1=Mic */
#define AC97_GP_RLBK              0x0400       /* Remote Loopback - Modem line codec */
#define AC97_GP_LLBK              0x0800       /* Local Loopback - Modem Line codec */
#define AC97_GP_LD                0x1000       /* Loudness 1=on */
#define AC97_GP_3D                0x2000       /* 3D Enhancement 1=on */
#define AC97_GP_ST                0x4000       /* Stereo Enhancement 1=on */
#define AC97_GP_POP               0x8000       /* Pcm Out Path, 0=pre 3D, 1=post 3D */


/* powerdown control and status bit defines */

/* status */
#define AC97_PWR_MDM              0x0010       /* Modem section ready */
#define AC97_PWR_REF              0x0008       /* Vref nominal */
#define AC97_PWR_ANL              0x0004       /* Analog section ready */
#define AC97_PWR_DAC              0x0002       /* DAC section ready */
#define AC97_PWR_ADC              0x0001       /* ADC section ready */

/* control */
#define AC97_PWR_PR0              0x0100       /* ADC and Mux powerdown */
#define AC97_PWR_PR1              0x0200       /* DAC powerdown */
#define AC97_PWR_PR2              0x0400       /* Output mixer powerdown (Vref on) */
#define AC97_PWR_PR3              0x0800       /* Output mixer powerdown (Vref off) */
#define AC97_PWR_PR4              0x1000       /* AC-link powerdown */
#define AC97_PWR_PR5              0x2000       /* Internal Clk disable */
#define AC97_PWR_PR6              0x4000       /* HP amp powerdown */
#define AC97_PWR_PR7              0x8000       /* Modem off - if supported */

/* useful power states */
#define AC97_PWR_D0               0x0000      /* everything on */
#define AC97_PWR_D1              AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR4
#define AC97_PWR_D2              AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR2|AC97_PWR_PR3|AC97_PWR_PR4
#define AC97_PWR_D3              AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR2|AC97_PWR_PR3|AC97_PWR_PR4
#define AC97_PWR_ANLOFF          AC97_PWR_PR2|AC97_PWR_PR3  /* analog section off */

/* Total number of defined registers.  */
#define AC97_REG_CNT 64


/* OSS interface to the ac97s.. */
#define AC97_STEREO_MASK (SOUND_MASK_VOLUME|SOUND_MASK_PCM|\
	SOUND_MASK_LINE|SOUND_MASK_CD|\
	SOUND_MASK_ALTPCM|SOUND_MASK_IGAIN|\
	SOUND_MASK_LINE1|SOUND_MASK_VIDEO)

#define AC97_SUPPORTED_MASK (AC97_STEREO_MASK | \
	SOUND_MASK_BASS|SOUND_MASK_TREBLE|\
	SOUND_MASK_SPEAKER|SOUND_MASK_MIC|\
	SOUND_MASK_PHONEIN|SOUND_MASK_PHONEOUT)

#define AC97_RECORD_MASK (SOUND_MASK_MIC|\
	SOUND_MASK_CD|SOUND_MASK_VIDEO|\
	SOUND_MASK_LINE1| SOUND_MASK_LINE|\
	SOUND_MASK_PHONEIN)

#define supported_mixer(CODEC,FOO) ( CODEC->supported_mixers & (1<<FOO) )

struct ac97_codec {
	/* AC97 controller connected with */
	void *private_data;

	char *name;
	int id;
	int dev_mixer; 

	/* codec specific init/reset routines, used mainly for 4 or 6 channel support */
	int  (*codec_init)  (struct ac97_codec *codec);

	/* controller specific lower leverl ac97 accessing routines */
	u16  (*codec_read)  (struct ac97_codec *codec, u8 reg);
	void (*codec_write) (struct ac97_codec *codec, u8 reg, u16 val);

	/* OSS mixer masks */
	int modcnt;
	int supported_mixers;
	int stereo_mixers;
	int record_sources;
	
	/* OSS mixer interface */
	int  (*read_mixer) (struct ac97_codec *codec, int oss_channel);
	void (*write_mixer)(struct ac97_codec *codec, int oss_channel,
			    unsigned int left, unsigned int right);
	int  (*recmask_io) (struct ac97_codec *codec, int rw, int mask);
	int  (*mixer_ioctl)(struct ac97_codec *codec, unsigned int cmd, unsigned long arg);

	/* saved OSS mixer states */
	unsigned int mixer_state[SOUND_MIXER_NRDEVICES];
};

extern int ac97_read_proc (char *page_out, char **start, off_t off,
			   int count, int *eof, void *data);
extern int ac97_probe_codec(struct ac97_codec *);

#endif /* _AC97_CODEC_H_ */
