ac97_codec.c

Source files for pxa ac97 sound driver The packet contains the files that is listed below driv

	id2 = codec->codec_read(codec, AC97_VENDOR_ID2);
	for (i = 0; i < ARRAY_SIZE(ac97_codec_ids); i++) {
		if (ac97_codec_ids[i].id == ((id1 << 16) | id2)) {
			codec->type = ac97_codec_ids[i].id;
			codec->name = ac97_codec_ids[i].name;
			codec->codec_ops = ac97_codec_ids[i].ops;
			break;
		}
	}
	if (codec->name == NULL)
		codec->name = "Unknown";
	printk(KERN_INFO "ac97_codec: AC97 %s codec, id: 0x%04x:"
	       "0x%04x (%s)\n", audio ? "Audio" : (modem ? "Modem" : ""),
	       id1, id2, codec->name);

	return ac97_init_mixer(codec);
}

static int ac97_init_mixer(struct ac97_codec *codec)
{
	u16 cap;
	int i;

	cap = codec->codec_read(codec, AC97_RESET);

	/* mixer masks */
	codec->supported_mixers = AC97_SUPPORTED_MASK;
	codec->stereo_mixers = AC97_STEREO_MASK;
	codec->record_sources = AC97_RECORD_MASK;
	if (!(cap & 0x04))
		codec->supported_mixers &= ~(SOUND_MASK_BASS|SOUND_MASK_TREBLE);
	if (!(cap & 0x10))
		codec->supported_mixers &= ~SOUND_MASK_ALTPCM;

	/* detect bit resolution */
	codec->codec_write(codec, AC97_MASTER_VOL_STEREO, 0x2020);
	if(codec->codec_read(codec, AC97_MASTER_VOL_STEREO) == 0x1f1f)
		codec->bit_resolution = 5;
	else
		codec->bit_resolution = 6;

	/* generic OSS to AC97 wrapper */
	codec->read_mixer = ac97_read_mixer;
	codec->write_mixer = ac97_write_mixer;
	codec->recmask_io = ac97_recmask_io;
	codec->mixer_ioctl = ac97_mixer_ioctl;

	/* codec specific initialization for 4-6 channel output or secondary codec stuff */
	if (codec->codec_ops->init != NULL) {
		codec->codec_ops->init(codec);
	}

	/* initialize mixer channel volumes */
	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
		struct mixer_defaults *md = &mixer_defaults[i];
		if (md->mixer == -1) 
			break;
		if (!supported_mixer(codec, md->mixer)) 
			continue;
		ac97_set_mixer(codec, md->mixer, md->value);
	}

	return 1;
}

#define AC97_SIGMATEL_ANALOG    0x6c	/* Analog Special */
#define AC97_SIGMATEL_DAC2INVERT 0x6e
#define AC97_SIGMATEL_BIAS1     0x70
#define AC97_SIGMATEL_BIAS2     0x72
#define AC97_SIGMATEL_MULTICHN  0x74	/* Multi-Channel programming */
#define AC97_SIGMATEL_CIC1      0x76
#define AC97_SIGMATEL_CIC2      0x78


static int sigmatel_9708_init(struct ac97_codec * codec)
{
	u16 codec72, codec6c;

	codec72 = codec->codec_read(codec, AC97_SIGMATEL_BIAS2) & 0x8000;
	codec6c = codec->codec_read(codec, AC97_SIGMATEL_ANALOG);

	if ((codec72==0) && (codec6c==0)) {
		codec->codec_write(codec, AC97_SIGMATEL_CIC1, 0xabba);
		codec->codec_write(codec, AC97_SIGMATEL_CIC2, 0x1000);
		codec->codec_write(codec, AC97_SIGMATEL_BIAS1, 0xabba);
		codec->codec_write(codec, AC97_SIGMATEL_BIAS2, 0x0007);
	} else if ((codec72==0x8000) && (codec6c==0)) {
		codec->codec_write(codec, AC97_SIGMATEL_CIC1, 0xabba);
		codec->codec_write(codec, AC97_SIGMATEL_CIC2, 0x1001);
		codec->codec_write(codec, AC97_SIGMATEL_DAC2INVERT, 0x0008);
	} else if ((codec72==0x8000) && (codec6c==0x0080)) {
		/* nothing */
	}
	codec->codec_write(codec, AC97_SIGMATEL_MULTICHN, 0x0000);
	return 0;
}


static int sigmatel_9721_init(struct ac97_codec * codec)
{
	/* Only set up secondary codec */
	if (codec->id == 0)
		return 0;

	codec->codec_write(codec, AC97_SURROUND_MASTER, 0L);

	/* initialize SigmaTel STAC9721/23 as secondary codec, decoding AC link
	   sloc 3,4 = 0x01, slot 7,8 = 0x00, */
	codec->codec_write(codec, AC97_SIGMATEL_MULTICHN, 0x00);

	/* we don't have the crystal when we are on an AMR card, so use
	   BIT_CLK as our clock source. Write the magic word ABBA and read
	   back to enable register 0x78 */
	codec->codec_write(codec, AC97_SIGMATEL_CIC1, 0xabba);
	codec->codec_read(codec, AC97_SIGMATEL_CIC1);

	/* sync all the clocks*/
	codec->codec_write(codec, AC97_SIGMATEL_CIC2, 0x3802);

	return 0;
}


static int sigmatel_9744_init(struct ac97_codec * codec)
{
	// patch for SigmaTel
	codec->codec_write(codec, AC97_SIGMATEL_CIC1, 0xabba);
	codec->codec_write(codec, AC97_SIGMATEL_CIC2, 0x0000); // is this correct? --jk
	codec->codec_write(codec, AC97_SIGMATEL_BIAS1, 0xabba);
	codec->codec_write(codec, AC97_SIGMATEL_BIAS2, 0x0002);
	codec->codec_write(codec, AC97_SIGMATEL_MULTICHN, 0x0000);
	return 0;
}


static int wolfson_init(struct ac97_codec * codec)
{
	codec->codec_write(codec, 0x72, 0x0808);
	codec->codec_write(codec, 0x74, 0x0808);

	// patch for DVD noise
	codec->codec_write(codec, 0x5a, 0x0200);

	// init vol as PCM vol
	codec->codec_write(codec, 0x70,
		codec->codec_read(codec, AC97_PCMOUT_VOL));

	codec->codec_write(codec, AC97_SURROUND_MASTER, 0x0000);
	return 0;
}


static int tritech_init(struct ac97_codec * codec)
{
	codec->codec_write(codec, 0x26, 0x0300);
	codec->codec_write(codec, 0x26, 0x0000);
	codec->codec_write(codec, AC97_SURROUND_MASTER, 0x0000);
	codec->codec_write(codec, AC97_RESERVED_3A, 0x0000);
	return 0;
}


/* copied from drivers/sound/maestro.c */
static int tritech_maestro_init(struct ac97_codec * codec)
{
	/* no idea what this does */
	codec->codec_write(codec, 0x2A, 0x0001);
	codec->codec_write(codec, 0x2C, 0x0000);
	codec->codec_write(codec, 0x2C, 0XFFFF);
	return 0;
}


/*
 *	This is basically standard AC97. It should work as a default for
 *	almost all modern codecs. Note that some cards wire EAPD *backwards*
 *	That side of it is up to the card driver not us to cope with.
 *
 */

static int eapd_control(struct ac97_codec * codec, int on)
{
	if(on)
		codec->codec_write(codec, AC97_POWER_CONTROL,
			codec->codec_read(codec, AC97_POWER_CONTROL)|0x8000);
	else
		codec->codec_write(codec, AC97_POWER_CONTROL,
			codec->codec_read(codec, AC97_POWER_CONTROL)&~0x8000);
	return 0;
}

/*
 *	Crystal digital audio control (CS4299
 */
 
static int crystal_digital_control(struct ac97_codec *codec, int mode)
{
	u16 cv;

	switch(mode)
	{
		case 0: cv = 0x0; break;	/* SPEN off */
		case 1: cv = 0x8004; break;	/* 48KHz digital */
		case 2: cv = 0x8104; break;	/* 44.1KHz digital */
		default:
			return -1;		/* Not supported yet(eg AC3) */
	}
	codec->codec_write(codec, 0x68, cv);
	return 0;
}

/* copied from drivers/sound/maestro.c */
#if 0  /* there has been 1 person on the planet with a pt101 that we
        know of.  If they care, they can put this back in :) */
static int pt101_init(struct ac97_codec * codec)
{
	printk(KERN_INFO "ac97_codec: PT101 Codec detected, initializing but _not_ installing mixer device.\n");
	/* who knows.. */
	codec->codec_write(codec, 0x2A, 0x0001);
	codec->codec_write(codec, 0x2C, 0x0000);
	codec->codec_write(codec, 0x2C, 0xFFFF);
	codec->codec_write(codec, 0x10, 0x9F1F);
	codec->codec_write(codec, 0x12, 0x0808);
	codec->codec_write(codec, 0x14, 0x9F1F);
	codec->codec_write(codec, 0x16, 0x9F1F);
	codec->codec_write(codec, 0x18, 0x0404);
	codec->codec_write(codec, 0x1A, 0x0000);
	codec->codec_write(codec, 0x1C, 0x0000);
	codec->codec_write(codec, 0x02, 0x0404);
	codec->codec_write(codec, 0x04, 0x0808);
	codec->codec_write(codec, 0x0C, 0x801F);
	codec->codec_write(codec, 0x0E, 0x801F);
	return 0;
}
#endif
	

EXPORT_SYMBOL(ac97_read_proc);
EXPORT_SYMBOL(ac97_probe_codec);

/*
 *	AC97 library support routines
 */	
 
/**
 *	ac97_set_dac_rate	-	set codec rate adaption
 *	@codec: ac97 code
 *	@rate: rate in hertz
 *
 *	Set the DAC rate. Assumes the codec supports VRA. The caller is
 *	expected to have checked this little detail.
 */
 
unsigned int ac97_set_dac_rate(struct ac97_codec *codec, unsigned int rate)
{
	unsigned int new_rate = rate;
	u32 dacp;
	u32 mast_vol, phone_vol, mono_vol, pcm_vol;
	u32 mute_vol = 0x8000;	/* The mute volume? */

	if(rate != codec->codec_read(codec, AC97_PCM_FRONT_DAC_RATE))
	{
		/* Mute several registers */
		mast_vol = codec->codec_read(codec, AC97_MASTER_VOL_STEREO);
		mono_vol = codec->codec_read(codec, AC97_MASTER_VOL_MONO);
		phone_vol = codec->codec_read(codec, AC97_HEADPHONE_VOL);
		pcm_vol = codec->codec_read(codec, AC97_PCMOUT_VOL);
		codec->codec_write(codec, AC97_MASTER_VOL_STEREO, mute_vol);
		codec->codec_write(codec, AC97_MASTER_VOL_MONO, mute_vol);
		codec->codec_write(codec, AC97_HEADPHONE_VOL, mute_vol);
		codec->codec_write(codec, AC97_PCMOUT_VOL, mute_vol);
		
		/* Power down the DAC */
		dacp=codec->codec_read(codec, AC97_POWER_CONTROL);
		codec->codec_write(codec, AC97_POWER_CONTROL, dacp|0x0200);
		/* Load the rate and read the effective rate */
		codec->codec_write(codec, AC97_PCM_FRONT_DAC_RATE, rate);
		new_rate=codec->codec_read(codec, AC97_PCM_FRONT_DAC_RATE);
		/* Power it back up */
		codec->codec_write(codec, AC97_POWER_CONTROL, dacp);

		/* Restore volumes */
		codec->codec_write(codec, AC97_MASTER_VOL_STEREO, mast_vol);
		codec->codec_write(codec, AC97_MASTER_VOL_MONO, mono_vol);
		codec->codec_write(codec, AC97_HEADPHONE_VOL, phone_vol);
		codec->codec_write(codec, AC97_PCMOUT_VOL, pcm_vol);
	}
	return new_rate;
}

EXPORT_SYMBOL(ac97_set_dac_rate);

/**
 *	ac97_set_adc_rate	-	set codec rate adaption
 *	@codec: ac97 code
 *	@rate: rate in hertz
 *
 *	Set the ADC rate. Assumes the codec supports VRA. The caller is
 *	expected to have checked this little detail.
 */

unsigned int ac97_set_adc_rate(struct ac97_codec *codec, unsigned int rate)
{
	unsigned int new_rate = rate;
	u32 dacp;

	if(rate != codec->codec_read(codec, AC97_PCM_LR_ADC_RATE))
	{
		/* Power down the ADC */
		dacp=codec->codec_read(codec, AC97_POWER_CONTROL);
		codec->codec_write(codec, AC97_POWER_CONTROL, dacp|0x0100);
		/* Load the rate and read the effective rate */
		codec->codec_write(codec, AC97_PCM_LR_ADC_RATE, rate);
		new_rate=codec->codec_read(codec, AC97_PCM_LR_ADC_RATE);
		/* Power it back up */
		codec->codec_write(codec, AC97_POWER_CONTROL, dacp);
	}
	return new_rate;
}

EXPORT_SYMBOL(ac97_set_adc_rate);

int ac97_save_state(struct ac97_codec *codec)
{
	return 0;	
}

EXPORT_SYMBOL(ac97_save_state);

int ac97_restore_state(struct ac97_codec *codec)
{
	int i;
	unsigned int left, right, val;

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
		if (!supported_mixer(codec, i)) 
			continue;

		val = codec->mixer_state[i];
		right = val >> 8;
		left = val  & 0xff;
		codec->write_mixer(codec, i, left, right);
	}
	return 0;
}

EXPORT_SYMBOL(ac97_restore_state);

MODULE_LICENSE("GPL");