ac97_codec.c

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/*
 * ac97_codec.c: Generic AC97 mixer/modem module
 *
 * Derived from ac97 mixer in maestro and trident driver.
 *
 * Copyright 2000 Silicon Integrated System Corporation
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 **************************************************************************
 *
 * The Intel Audio Codec '97 specification is available at the Intel
 * audio homepage: http://developer.intel.com/ial/scalableplatforms/audio/
 *
 * The specification itself is currently available at:
 * ftp://download.intel.com/ial/scalableplatforms/ac97r22.pdf
 *
 **************************************************************************
 *
 * History
 * May 02, 2003 Liam Girdwood <[e-mail]>
 *	Removed non existant WM9700
 *	Added support for WM9705, WM9708, WM9709, WM9710, WM9711
 *	WM9712 and WM9717
 * Mar 28, 2002 Randolph Bentson <[e-mail]>
 *	corrections to support WM9707 in ViewPad 1000
 * v0.4 Mar 15 2000 Ollie Lho
 *	dual codecs support verified with 4 channels output
 * v0.3 Feb 22 2000 Ollie Lho
 *	bug fix for record mask setting
 * v0.2 Feb 10 2000 Ollie Lho
 *	add ac97_read_proc for /proc/driver/{vendor}/ac97
 * v0.1 Jan 14 2000 Ollie Lho <[e-mail]> 
 *	Isolated from trident.c to support multiple ac97 codec
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/ac97_codec.h>
#include <asm/uaccess.h>

#define CODEC_ID_BUFSZ 14

static int ac97_read_mixer(struct ac97_codec *codec, int oss_channel);
static void ac97_write_mixer(struct ac97_codec *codec, int oss_channel, 
			     unsigned int left, unsigned int right);
static void ac97_set_mixer(struct ac97_codec *codec, unsigned int oss_mixer, unsigned int val );
static int ac97_recmask_io(struct ac97_codec *codec, int rw, int mask);
static int ac97_mixer_ioctl(struct ac97_codec *codec, unsigned int cmd, unsigned long arg);

static int ac97_init_mixer(struct ac97_codec *codec);

static int wolfson_init03(struct ac97_codec * codec);
static int wolfson_init04(struct ac97_codec * codec);
static int wolfson_init05(struct ac97_codec * codec);
static int wolfson_init11(struct ac97_codec * codec);
static int tritech_init(struct ac97_codec * codec);
static int tritech_maestro_init(struct ac97_codec * codec);
static int sigmatel_9708_init(struct ac97_codec *codec);
static int sigmatel_9721_init(struct ac97_codec *codec);
static int sigmatel_9744_init(struct ac97_codec *codec);
static int ad1886_init(struct ac97_codec *codec);
static int eapd_control(struct ac97_codec *codec, int);
static int crystal_digital_control(struct ac97_codec *codec, int slots, int rate, int mode);
static int cmedia_init(struct ac97_codec * codec);
static int cmedia_digital_control(struct ac97_codec *codec, int slots, int rate, int mode);
static int generic_digital_control(struct ac97_codec *codec, int slots, int rate, int mode);


/*
 *	AC97 operations.
 *
 *	If you are adding a codec then you should be able to use
 *		eapd_ops - any codec that supports EAPD amp control (most)
 *		null_ops - any ancient codec that supports nothing
 *
 *	The three functions are
 *		init - used for non AC97 standard initialisation
 *		amplifier - used to do amplifier control (1=on 0=off)
 *		digital - switch to digital modes (0 = analog)
 *
 *	Not all codecs support all features, not all drivers use all the
 *	operations yet
 */
 
static struct ac97_ops null_ops = { NULL, NULL, NULL };
static struct ac97_ops default_ops = { NULL, eapd_control, NULL };
static struct ac97_ops default_digital_ops = { NULL, eapd_control, generic_digital_control};
static struct ac97_ops wolfson_ops03 = { wolfson_init03, NULL, NULL };
static struct ac97_ops wolfson_ops04 = { wolfson_init04, NULL, NULL };
static struct ac97_ops wolfson_ops05 = { wolfson_init05, NULL, NULL };
static struct ac97_ops wolfson_ops11 = { wolfson_init11, NULL, NULL };
static struct ac97_ops tritech_ops = { tritech_init, NULL, NULL };
static struct ac97_ops tritech_m_ops = { tritech_maestro_init, NULL, NULL };
static struct ac97_ops sigmatel_9708_ops = { sigmatel_9708_init, NULL, NULL };
static struct ac97_ops sigmatel_9721_ops = { sigmatel_9721_init, NULL, NULL };
static struct ac97_ops sigmatel_9744_ops = { sigmatel_9744_init, NULL, NULL };
static struct ac97_ops crystal_digital_ops = { NULL, eapd_control, crystal_digital_control };
static struct ac97_ops ad1886_ops = { ad1886_init, eapd_control, NULL };
static struct ac97_ops cmedia_ops = { NULL, eapd_control, NULL};
static struct ac97_ops cmedia_digital_ops = { cmedia_init, eapd_control, cmedia_digital_control};

/* sorted by vendor/device id */
static const struct {
	u32 id;
	char *name;
	struct ac97_ops *ops;
	int flags;
} ac97_codec_ids[] = {
	{0x41445303, "Analog Devices AD1819",	&null_ops},
	{0x41445340, "Analog Devices AD1881",	&null_ops},
	{0x41445348, "Analog Devices AD1881A",	&null_ops},
	{0x41445360, "Analog Devices AD1885",	&default_ops},
	{0x41445361, "Analog Devices AD1886",	&ad1886_ops},
	{0x41445460, "Analog Devices AD1885",	&default_ops},
	{0x41445461, "Analog Devices AD1886",	&ad1886_ops},
	{0x414B4D00, "Asahi Kasei AK4540",	&null_ops},
	{0x414B4D01, "Asahi Kasei AK4542",	&null_ops},
	{0x414B4D02, "Asahi Kasei AK4543",	&null_ops},
	{0x414C4326, "ALC100P",			&null_ops},
	{0x414C4710, "ALC200/200P",		&null_ops},
	{0x414C4720, "ALC650",			&default_digital_ops},
	{0x434D4941, "CMedia",			&cmedia_ops,		AC97_NO_PCM_VOLUME },
	{0x434D4942, "CMedia",			&cmedia_ops,		AC97_NO_PCM_VOLUME },
	{0x434D4961, "CMedia",			&cmedia_digital_ops,	AC97_NO_PCM_VOLUME },
	{0x43525900, "Cirrus Logic CS4297",	&default_ops},
	{0x43525903, "Cirrus Logic CS4297",	&default_ops},
	{0x43525913, "Cirrus Logic CS4297A rev A", &default_ops},
	{0x43525914, "Cirrus Logic CS4297A rev B", &default_ops},
	{0x43525923, "Cirrus Logic CS4298",	&null_ops},
	{0x4352592B, "Cirrus Logic CS4294",	&null_ops},
	{0x4352592D, "Cirrus Logic CS4294",	&null_ops},
	{0x43525931, "Cirrus Logic CS4299 rev A", &crystal_digital_ops},
	{0x43525933, "Cirrus Logic CS4299 rev C", &crystal_digital_ops},
	{0x43525934, "Cirrus Logic CS4299 rev D", &crystal_digital_ops},
	{0x43585442, "CXT66",			&default_ops,		AC97_DELUDED_MODEM },
	{0x44543031, "Diamond Technology DT0893", &default_ops},
	{0x45838308, "ESS Allegro ES1988",	&null_ops},
	{0x49434511, "ICE1232",			&null_ops}, /* I hope --jk */
	{0x4e534331, "National Semiconductor LM4549", &null_ops},
	{0x53494c22, "Silicon Laboratory Si3036", &null_ops},
	{0x53494c23, "Silicon Laboratory Si3038", &null_ops},
	{0x545200FF, "TriTech TR?????",		&tritech_m_ops},
	{0x54524102, "TriTech TR28022",		&null_ops},
	{0x54524103, "TriTech TR28023",		&null_ops},
	{0x54524106, "TriTech TR28026",		&null_ops},
	{0x54524108, "TriTech TR28028",		&tritech_ops},
	{0x54524123, "TriTech TR A5",		&null_ops},
	{0x574D4C03, "Wolfson WM9703/07/08/17",	&wolfson_ops03},
	{0x574D4C04, "Wolfson WM9704M/WM9704Q",	&wolfson_ops04},
	{0x574D4C05, "Wolfson WM9705/WM9710",   &wolfson_ops05},
	{0x574D4C09, "Wolfson WM9709",		&null_ops},
	{0x574D4C12, "Wolfson WM9711/9712",	&wolfson_ops11},
	{0x83847600, "SigmaTel STAC????",	&null_ops},
	{0x83847604, "SigmaTel STAC9701/3/4/5", &null_ops},
	{0x83847605, "SigmaTel STAC9704",	&null_ops},
	{0x83847608, "SigmaTel STAC9708",	&sigmatel_9708_ops},
	{0x83847609, "SigmaTel STAC9721/23",	&sigmatel_9721_ops},
	{0x83847644, "SigmaTel STAC9744/45",	&sigmatel_9744_ops},
	{0x83847656, "SigmaTel STAC9756/57",	&sigmatel_9744_ops},
	{0x83847666, "SigmaTel STAC9750T",	&sigmatel_9744_ops},
	{0x83847684, "SigmaTel STAC9783/84?",	&null_ops},
	{0x57454301, "Winbond 83971D",		&null_ops},
};

static const char *ac97_stereo_enhancements[] =
{
	/*   0 */ "No 3D Stereo Enhancement",
	/*   1 */ "Analog Devices Phat Stereo",
	/*   2 */ "Creative Stereo Enhancement",
	/*   3 */ "National Semi 3D Stereo Enhancement",
	/*   4 */ "YAMAHA Ymersion",
	/*   5 */ "BBE 3D Stereo Enhancement",
	/*   6 */ "Crystal Semi 3D Stereo Enhancement",
	/*   7 */ "Qsound QXpander",
	/*   8 */ "Spatializer 3D Stereo Enhancement",
	/*   9 */ "SRS 3D Stereo Enhancement",
	/*  10 */ "Platform Tech 3D Stereo Enhancement",
	/*  11 */ "AKM 3D Audio",
	/*  12 */ "Aureal Stereo Enhancement",
	/*  13 */ "Aztech 3D Enhancement",
	/*  14 */ "Binaura 3D Audio Enhancement",
	/*  15 */ "ESS Technology Stereo Enhancement",
	/*  16 */ "Harman International VMAx",
	/*  17 */ "Nvidea 3D Stereo Enhancement",
	/*  18 */ "Philips Incredible Sound",
	/*  19 */ "Texas Instruments 3D Stereo Enhancement",
	/*  20 */ "VLSI Technology 3D Stereo Enhancement",
	/*  21 */ "TriTech 3D Stereo Enhancement",
	/*  22 */ "Realtek 3D Stereo Enhancement",
	/*  23 */ "Samsung 3D Stereo Enhancement",
	/*  24 */ "Wolfson Microelectronics 3D Enhancement",
	/*  25 */ "Delta Integration 3D Enhancement",
	/*  26 */ "SigmaTel 3D Enhancement",
	/*  27 */ "Winbond 3D Stereo Enhancement",
	/*  28 */ "Rockwell 3D Stereo Enhancement",
	/*  29 */ "Reserved 29",
	/*  30 */ "Reserved 30",
	/*  31 */ "Reserved 31"
};

/* this table has default mixer values for all OSS mixers. */
static struct mixer_defaults {
	int mixer;
	unsigned int value;
} mixer_defaults[SOUND_MIXER_NRDEVICES] = {
	/* all values 0 -> 100 in bytes */
	{SOUND_MIXER_VOLUME,	0x4343},
	{SOUND_MIXER_BASS,	0x4343},
	{SOUND_MIXER_TREBLE,	0x4343},
	{SOUND_MIXER_PCM,	0x4343},
	{SOUND_MIXER_SPEAKER,	0x4343},
	{SOUND_MIXER_LINE,	0x4343},
	{SOUND_MIXER_MIC,	0x0000},
	{SOUND_MIXER_CD,	0x4343},
	{SOUND_MIXER_ALTPCM,	0x4343},
	{SOUND_MIXER_IGAIN,	0x4343},
	{SOUND_MIXER_LINE1,	0x4343},
	{SOUND_MIXER_PHONEIN,	0x4343},
	{SOUND_MIXER_PHONEOUT,	0x4343},
	{SOUND_MIXER_VIDEO,	0x4343},
	{-1,0}
};

/* table to scale scale from OSS mixer value to AC97 mixer register value */	
static struct ac97_mixer_hw {
	unsigned char offset;
	int scale;
} ac97_hw[SOUND_MIXER_NRDEVICES]= {
	[SOUND_MIXER_VOLUME]	=	{AC97_MASTER_VOL_STEREO,64},
	[SOUND_MIXER_BASS]	=	{AC97_MASTER_TONE,	16},
	[SOUND_MIXER_TREBLE]	=	{AC97_MASTER_TONE,	16},
	[SOUND_MIXER_PCM]	=	{AC97_PCMOUT_VOL,	32},
	[SOUND_MIXER_SPEAKER]	=	{AC97_PCBEEP_VOL,	16},
	[SOUND_MIXER_LINE]	=	{AC97_LINEIN_VOL,	32},
	[SOUND_MIXER_MIC]	=	{AC97_MIC_VOL,		32},
	[SOUND_MIXER_CD]	=	{AC97_CD_VOL,		32},
	[SOUND_MIXER_ALTPCM]	=	{AC97_HEADPHONE_VOL,	64},
	[SOUND_MIXER_IGAIN]	=	{AC97_RECORD_GAIN,	16},
	[SOUND_MIXER_LINE1]	=	{AC97_AUX_VOL,		32},
	[SOUND_MIXER_PHONEIN]	= 	{AC97_PHONE_VOL,	32},
	[SOUND_MIXER_PHONEOUT]	= 	{AC97_MASTER_VOL_MONO,	64},
	[SOUND_MIXER_VIDEO]	=	{AC97_VIDEO_VOL,	32},
};

/* the following tables allow us to go from OSS <-> ac97 quickly. */
enum ac97_recsettings {
	AC97_REC_MIC=0,
	AC97_REC_CD,
	AC97_REC_VIDEO,
	AC97_REC_AUX,
	AC97_REC_LINE,
	AC97_REC_STEREO, /* combination of all enabled outputs..  */
	AC97_REC_MONO,	      /*.. or the mono equivalent */
	AC97_REC_PHONE
};

static const unsigned int ac97_rm2oss[] = {
	[AC97_REC_MIC] 	 = SOUND_MIXER_MIC,
	[AC97_REC_CD] 	 = SOUND_MIXER_CD,
	[AC97_REC_VIDEO] = SOUND_MIXER_VIDEO,
	[AC97_REC_AUX] 	 = SOUND_MIXER_LINE1,
	[AC97_REC_LINE]  = SOUND_MIXER_LINE,
	[AC97_REC_STEREO]= SOUND_MIXER_IGAIN,
	[AC97_REC_PHONE] = SOUND_MIXER_PHONEIN
};

/* indexed by bit position */
static const unsigned int ac97_oss_rm[] = {
	[SOUND_MIXER_MIC] 	= AC97_REC_MIC,
	[SOUND_MIXER_CD] 	= AC97_REC_CD,
	[SOUND_MIXER_VIDEO] 	= AC97_REC_VIDEO,
	[SOUND_MIXER_LINE1] 	= AC97_REC_AUX,
	[SOUND_MIXER_LINE] 	= AC97_REC_LINE,
	[SOUND_MIXER_IGAIN]	= AC97_REC_STEREO,
	[SOUND_MIXER_PHONEIN] 	= AC97_REC_PHONE
};

static LIST_HEAD(codecs);
static LIST_HEAD(codec_drivers);
static DECLARE_MUTEX(codec_sem);

/* reads the given OSS mixer from the ac97 the caller must have insured that the ac97 knows
   about that given mixer, and should be holding a spinlock for the card */
static int ac97_read_mixer(struct ac97_codec *codec, int oss_channel) 
{
	u16 val;
	int ret = 0;
	int scale;
	struct ac97_mixer_hw *mh = &ac97_hw[oss_channel];

	val = codec->codec_read(codec , mh->offset);

	if (val & AC97_MUTE) {
		ret = 0;
	} else if (AC97_STEREO_MASK & (1 << oss_channel)) {
		/* nice stereo mixers .. */
		int left,right;

		left = (val >> 8)  & 0x7f;
		right = val  & 0x7f;

		if (oss_channel == SOUND_MIXER_IGAIN) {
			right = (right * 100) / mh->scale;
			left = (left * 100) / mh->scale;
		} else {
			/* these may have 5 or 6 bit resolution */
			if(oss_channel == SOUND_MIXER_VOLUME || oss_channel == SOUND_MIXER_ALTPCM)
				scale = (1 << codec->bit_resolution);
			else
				scale = mh->scale;

			right = 100 - ((right * 100) / scale);
			left = 100 - ((left * 100) / scale);
		}
		ret = left | (right << 8);
	} else if (oss_channel == SOUND_MIXER_SPEAKER) {
		ret = 100 - ((((val & 0x1e)>>1) * 100) / mh->scale);
	} else if (oss_channel == SOUND_MIXER_PHONEIN) {
		ret = 100 - (((val & 0x1f) * 100) / mh->scale);
	} else if (oss_channel == SOUND_MIXER_PHONEOUT) {
		scale = (1 << codec->bit_resolution);
		ret = 100 - (((val & 0x1f) * 100) / scale);
	} else if (oss_channel == SOUND_MIXER_MIC) {
		ret = 100 - (((val & 0x1f) * 100) / mh->scale);
		/*  the low bit is optional in the tone sliders and masking
		    it lets us avoid the 0xf 'bypass'.. */
	} else if (oss_channel == SOUND_MIXER_BASS) {
		ret = 100 - ((((val >> 8) & 0xe) * 100) / mh->scale);
	} else if (oss_channel == SOUND_MIXER_TREBLE) {
		ret = 100 - (((val & 0xe) * 100) / mh->scale);
	}

#ifdef DEBUG
	printk("ac97_codec: read OSS mixer %2d (%s ac97 register 0x%02x), "
	       "0x%04x -> 0x%04x\n",
	       oss_channel, codec->id ? "Secondary" : "Primary",
	       mh->offset, val, ret);
#endif

	return ret;
}

/* write the OSS encoded volume to the given OSS encoded mixer, again caller's job to
   make sure all is well in arg land, call with spinlock held */
static void ac97_write_mixer(struct ac97_codec *codec, int oss_channel,
		      unsigned int left, unsigned int right)
{
	u16 val = 0;
	int scale;
	struct ac97_mixer_hw *mh = &ac97_hw[oss_channel];

#ifdef DEBUG
	printk("ac97_codec: wrote OSS mixer %2d (%s ac97 register 0x%02x), "
	       "left vol:%2d, right vol:%2d:",
	       oss_channel, codec->id ? "Secondary" : "Primary",
	       mh->offset, left, right);
#endif

	if (AC97_STEREO_MASK & (1 << oss_channel)) {
		/* stereo mixers */
		if (left == 0 && right == 0) {
			val = AC97_MUTE;
		} else {
			if (oss_channel == SOUND_MIXER_IGAIN) {
				right = (right * mh->scale) / 100;
				left = (left * mh->scale) / 100;
				if (right >= mh->scale)
					right = mh->scale-1;
				if (left >= mh->scale)
					left = mh->scale-1;
			} else {
				/* these may have 5 or 6 bit resolution */
				if (oss_channel == SOUND_MIXER_VOLUME ||
				    oss_channel == SOUND_MIXER_ALTPCM)
					scale = (1 << codec->bit_resolution);
				else
					scale = mh->scale;

				right = ((100 - right) * scale) / 100;
				left = ((100 - left) * scale) / 100;
				if (right >= scale)
					right = scale-1;
				if (left >= scale)
					left = scale-1;
			}
			val = (left << 8) | right;
		}
	} else if (oss_channel == SOUND_MIXER_BASS) {
		val = codec->codec_read(codec , mh->offset) & ~0x0f00;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= (left << 8) & 0x0e00;
	} else if (oss_channel == SOUND_MIXER_TREBLE) {
		val = codec->codec_read(codec , mh->offset) & ~0x000f;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= left & 0x000e;
	} else if(left == 0) {
		val = AC97_MUTE;
	} else if (oss_channel == SOUND_MIXER_SPEAKER) {
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left << 1;
	} else if (oss_channel == SOUND_MIXER_PHONEIN) {
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left;
	} else if (oss_channel == SOUND_MIXER_PHONEOUT) {
		scale = (1 << codec->bit_resolution);
		left = ((100 - left) * scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left;
	} else if (oss_channel == SOUND_MIXER_MIC) {
		val = codec->codec_read(codec , mh->offset) & ~0x801f;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= left;
		/*  the low bit is optional in the tone sliders and masking
		    it lets us avoid the 0xf 'bypass'.. */
	}
#ifdef DEBUG
	printk(" 0x%04x", val);
#endif

	codec->codec_write(codec, mh->offset, val);

#ifdef DEBUG
	val = codec->codec_read(codec, mh->offset);
	printk(" -> 0x%04x\n", val);
#endif
}

/* a thin wrapper for write_mixer */
static void ac97_set_mixer(struct ac97_codec *codec, unsigned int oss_mixer, unsigned int val ) 
{
	unsigned int left,right;

	/* cleanse input a little */
	right = ((val >> 8)  & 0xff) ;
	left = (val  & 0xff) ;

	if (right > 100) right = 100;
	if (left > 100) left = 100;

	codec->mixer_state[oss_mixer] = (right << 8) | left;
	codec->write_mixer(codec, oss_mixer, left, right);
}

/* read or write the recmask, the ac97 can really have left and right recording
   inputs independantly set, but OSS doesn't seem to want us to express that to
   the user. the caller guarantees that we have a supported bit set, and they
   must be holding the card's spinlock */
static int ac97_recmask_io(struct ac97_codec *codec, int rw, int mask) 
{
	unsigned int val;

	if (rw) {
		/* read it from the card */
		val = codec->codec_read(codec, AC97_RECORD_SELECT);
#ifdef DEBUG
		printk("ac97_codec: ac97 recmask to set to 0x%04x\n", val);
#endif
		return (1 << ac97_rm2oss[val & 0x07]);