Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1576 insertions, 0 deletions

diff --git a/sound/oss/ac97_codec.c b/sound/oss/ac97_codec.c
new file mode 100644
index 000000000000..124b1e10a13d
--- /dev/null
+++ b/sound/oss/ac97_codec.c
@@ -0,0 +1,1576 @@
+/*
+ * 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 <liam.girdwood@wolfsonmicro.com>
+ *	Removed non existant WM9700
+ *	Added support for WM9705, WM9708, WM9709, WM9710, WM9711
+ *	WM9712 and WM9717
+ * Mar 28, 2002 Randolph Bentson <bentson@holmsjoen.com>
+ *	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 <ollie@sis.com.tw> 
+ *	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/pci.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 wolfson_init13(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 wolfson_ops13 = { wolfson_init13, 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},
+	{0x41445370, "Analog Devices AD1981",	&null_ops},
+	{0x41445372, "Analog Devices AD1981A",	&null_ops},
+	{0x41445374, "Analog Devices AD1981B",	&null_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},
+	{0x574D4C13, "Wolfson WM9713",	&wolfson_ops13, AC97_DEFAULT_POWER_OFF},
+	{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},
+	{0x83847652, "SigmaTel STAC9752/53",	&default_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]);
+	}
+
+	/* else, write the first set in the mask as the
+	   output */	
+	/* clear out current set value first (AC97 supports only 1 input!) */
+	val = (1 << ac97_rm2oss[codec->codec_read(codec, AC97_RECORD_SELECT) & 0x07]);
+	if (mask != val)
+	    mask &= ~val;
+       
+	val = ffs(mask); 
+	val = ac97_oss_rm[val-1];
+	val |= val << 8;  /* set both channels */
+
+#ifdef DEBUG
+	printk("ac97_codec: setting ac97 recmask to 0x%04x\n", val);
+#endif
+
+	codec->codec_write(codec, AC97_RECORD_SELECT, val);
+
+	return 0;
+};
+
+static int ac97_mixer_ioctl(struct ac97_codec *codec, unsigned int cmd, unsigned long arg)
+{
+	int i, val = 0;
+
+	if (cmd == SOUND_MIXER_INFO) {
+		mixer_info info;
+		memset(&info, 0, sizeof(info));
+		strlcpy(info.id, codec->name, sizeof(info.id));
+		strlcpy(info.name, codec->name, sizeof(info.name));
+		info.modify_counter = codec->modcnt;
+		if (copy_to_user((void __user *)arg, &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+	if (cmd == SOUND_OLD_MIXER_INFO) {
+		_old_mixer_info info;
+		memset(&info, 0, sizeof(info));
+		strlcpy(info.id, codec->name, sizeof(info.id));
+		strlcpy(info.name, codec->name, sizeof(info.name));
+		if (copy_to_user((void __user *)arg, &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+
+	if (_IOC_TYPE(cmd) != 'M' || _SIOC_SIZE(cmd) != sizeof(int))
+		return -EINVAL;
+
+	if (cmd == OSS_GETVERSION)
+		return put_user(SOUND_VERSION, (int __user *)arg);
+
+	if (_SIOC_DIR(cmd) == _SIOC_READ) {
+		switch (_IOC_NR(cmd)) {
+		case SOUND_MIXER_RECSRC: /* give them the current record source */
+			if (!codec->recmask_io) {
+				val = 0;
+			} else {
+				val = codec->recmask_io(codec, 1, 0);
+			}
+			break;
+
+		case SOUND_MIXER_DEVMASK: /* give them the supported mixers */
+			val = codec->supported_mixers;
+			break;
+
+		case SOUND_MIXER_RECMASK: /* Arg contains a bit for each supported recording source */
+			val = codec->record_sources;
+			break;
+
+		case SOUND_MIXER_STEREODEVS: /* Mixer channels supporting stereo */
+			val = codec->stereo_mixers;
+			break;
+
+		case SOUND_MIXER_CAPS:
+			val = SOUND_CAP_EXCL_INPUT;
+			break;
+
+		default: /* read a specific mixer */
+			i = _IOC_NR(cmd);
+
+			if (!supported_mixer(codec, i)) 
+				return -EINVAL;
+
+			/* do we ever want to touch the hardware? */
+		        /* val = codec->read_mixer(codec, i); */
+			val = codec->mixer_state[i];
+ 			break;
+		}
+		return put_user(val, (int __user *)arg);
+	}
+
+	if (_SIOC_DIR(cmd) == (_SIOC_WRITE|_SIOC_READ)) {
+		codec->modcnt++;
+		if (get_user(val, (int __user *)arg))
+			return -EFAULT;
+
+		switch (_IOC_NR(cmd)) {
+		case SOUND_MIXER_RECSRC: /* Arg contains a bit for each recording source */
+			if (!codec->recmask_io) return -EINVAL;
+			if (!val) return 0;
+			if (!(val &= codec->record_sources)) return -EINVAL;
+
+			codec->recmask_io(codec, 0, val);
+
+			return 0;
+		default: /* write a specific mixer */
+			i = _IOC_NR(cmd);
+
+			if (!supported_mixer(codec, i)) 
+				return -EINVAL;
+
+			ac97_set_mixer(codec, i, val);
+
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+/* entry point for /proc/driver/controller_vendor/ac97/%d */
+int ac97_read_proc (char *page, char **start, off_t off,
+		    int count, int *eof, void *data)
+{
+	int len = 0, cap, extid, val, id1, id2;
+	struct ac97_codec *codec;
+	int is_ac97_20 = 0;
+
+	if ((codec = data) == NULL)
+		return -ENODEV;
+
+	id1 = codec->codec_read(codec, AC97_VENDOR_ID1);
+	id2 = codec->codec_read(codec, AC97_VENDOR_ID2);
+	len += sprintf (page+len, "Vendor name      : %s\n", codec->name);
+	len += sprintf (page+len, "Vendor id        : %04X %04X\n", id1, id2);
+
+	extid = codec->codec_read(codec, AC97_EXTENDED_ID);
+	extid &= ~((1<<2)|(1<<4)|(1<<5)|(1<<10)|(1<<11)|(1<<12)|(1<<13));
+	len += sprintf (page+len, "AC97 Version     : %s\n",
+			extid ? "2.0 or later" : "1.0");
+	if (extid) is_ac97_20 = 1;
+
+	cap = codec->codec_read(codec, AC97_RESET);
+	len += sprintf (page+len, "Capabilities     :%s%s%s%s%s%s\n",
+			cap & 0x0001 ? " -dedicated MIC PCM IN channel-" : "",
+			cap & 0x0002 ? " -reserved1-" : "",
+			cap & 0x0004 ? " -bass & treble-" : "",
+			cap & 0x0008 ? " -simulated stereo-" : "",
+			cap & 0x0010 ? " -headphone out-" : "",
+			cap & 0x0020 ? " -loudness-" : "");
+	val = cap & 0x00c0;
+	len += sprintf (page+len, "DAC resolutions  :%s%s%s\n",
+			" -16-bit-",
+			val & 0x0040 ? " -18-bit-" : "",
+			val & 0x0080 ? " -20-bit-" : "");
+	val = cap & 0x0300;
+	len += sprintf (page+len, "ADC resolutions  :%s%s%s\n",
+			" -16-bit-",
+			val & 0x0100 ? " -18-bit-" : "",
+			val & 0x0200 ? " -20-bit-" : "");
+	len += sprintf (page+len, "3D enhancement   : %s\n",
+			ac97_stereo_enhancements[(cap >> 10) & 0x1f]);
+
+	val = codec->codec_read(codec, AC97_GENERAL_PURPOSE);
+	len += sprintf (page+len, "POP path         : %s 3D\n"
+			"Sim. stereo      : %s\n"
+			"3D enhancement   : %s\n"
+			"Loudness         : %s\n"
+			"Mono output      : %s\n"
+			"MIC select       : %s\n"
+			"ADC/DAC loopback : %s\n",
+			val & 0x8000 ? "post" : "pre",
+			val & 0x4000 ? "on" : "off",
+			val & 0x2000 ? "on" : "off",
+			val & 0x1000 ? "on" : "off",
+			val & 0x0200 ? "MIC" : "MIX",
+			val & 0x0100 ? "MIC2" : "MIC1",
+			val & 0x0080 ? "on" : "off");
+
+	extid = codec->codec_read(codec, AC97_EXTENDED_ID);
+	cap = extid;
+	len += sprintf (page+len, "Ext Capabilities :%s%s%s%s%s%s%s\n",
+			cap & 0x0001 ? " -var rate PCM audio-" : "",
+			cap & 0x0002 ? " -2x PCM audio out-" : "",
+			cap & 0x0008 ? " -var rate MIC in-" : "",
+			cap & 0x0040 ? " -PCM center DAC-" : "",
+			cap & 0x0080 ? " -PCM surround DAC-" : "",
+			cap & 0x0100 ? " -PCM LFE DAC-" : "",
+			cap & 0x0200 ? " -slot/DAC mappings-" : "");
+	if (is_ac97_20) {
+		len += sprintf (page+len, "Front DAC rate   : %d\n",
+				codec->codec_read(codec, AC97_PCM_FRONT_DAC_RATE));
+	}
+
+	return len;
+}
+
+/**
+ *	codec_id	-  Turn id1/id2 into a PnP string
+ *	@id1: Vendor ID1
+ *	@id2: Vendor ID2
+ *	@buf: CODEC_ID_BUFSZ byte buffer
+ *
+ *	Fills buf with a zero terminated PnP ident string for the id1/id2
+ *	pair. For convenience the return is the passed in buffer pointer.
+ */
+ 
+static char *codec_id(u16 id1, u16 id2, char *buf)
+{
+	if(id1&0x8080) {
+		snprintf(buf, CODEC_ID_BUFSZ, "0x%04x:0x%04x", id1, id2);
+	} else {
+		buf[0] = (id1 >> 8);
+		buf[1] = (id1 & 0xFF);
+		buf[2] = (id2 >> 8);
+		snprintf(buf+3, CODEC_ID_BUFSZ - 3, "%d", id2&0xFF);
+	}
+	return buf;
+}
+ 
+/**
+ *	ac97_check_modem - Check if the Codec is a modem
+ *	@codec: codec to check
+ *
+ *	Return true if the device is an AC97 1.0 or AC97 2.0 modem
+ */
+ 
+static int ac97_check_modem(struct ac97_codec *codec)
+{
+	/* Check for an AC97 1.0 soft modem (ID1) */
+	if(codec->codec_read(codec, AC97_RESET) & 2)
+		return 1;
+	/* Check for an AC97 2.x soft modem */
+	codec->codec_write(codec, AC97_EXTENDED_MODEM_ID, 0L);
+	if(codec->codec_read(codec, AC97_EXTENDED_MODEM_ID) & 1)
+		return 1;
+	return 0;
+}
+
+
+/**
+ *	ac97_alloc_codec - Allocate an AC97 codec
+ *
+ *	Returns a new AC97 codec structure. AC97 codecs may become
+ *	refcounted soon so this interface is needed. Returns with
+ *	one reference taken.
+ */
+ 
+struct ac97_codec *ac97_alloc_codec(void)
+{
+	struct ac97_codec *codec = kmalloc(sizeof(struct ac97_codec), GFP_KERNEL);
+	if(!codec)
+		return NULL;
+
+	memset(codec, 0, sizeof(*codec));
+	spin_lock_init(&codec->lock);
+	INIT_LIST_HEAD(&codec->list);
+	return codec;
+}
+
+EXPORT_SYMBOL(ac97_alloc_codec);
+
+/**
+ *	ac97_release_codec -	Release an AC97 codec
+ *	@codec: codec to release
+ *
+ *	Release an allocated AC97 codec. This will be refcounted in
+ *	time but for the moment is trivial. Calls the unregister
+ *	handler if the codec is now defunct.
+ */
+ 
+void ac97_release_codec(struct ac97_codec *codec)
+{
+	/* Remove from the list first, we don't want to be
+	   "rediscovered" */
+	down(&codec_sem);
+	list_del(&codec->list);
+	up(&codec_sem);
+	/*
+	 *	The driver needs to deal with internal
+	 *	locking to avoid accidents here. 
+	 */
+	if(codec->driver)
+		codec->driver->remove(codec, codec->driver);
+	kfree(codec);
+}
+
+EXPORT_SYMBOL(ac97_release_codec);
+
+/**
+ *	ac97_probe_codec - Initialize and setup AC97-compatible codec
+ *	@codec: (in/out) Kernel info for a single AC97 codec
+ *
+ *	Reset the AC97 codec, then initialize the mixer and
+ *	the rest of the @codec structure.
+ *
+ *	The codec_read and codec_write fields of @codec are
+ *	required to be setup and working when this function
+ *	is called.  All other fields are set by this function.
+ *
+ *	codec_wait field of @codec can optionally be provided
+ *	when calling this function.  If codec_wait is not %NULL,
+ *	this function will call codec_wait any time it is
+ *	necessary to wait for the audio chip to reach the
+ *	codec-ready state.  If codec_wait is %NULL, then
+ *	the default behavior is to call schedule_timeout.
+ *	Currently codec_wait is used to wait for AC97 codec
+ *	reset to complete. 
+ *
+ *     Some codecs will power down when a register reset is
+ *     performed. We now check for such codecs.
+ *
+ *	Returns 1 (true) on success, or 0 (false) on failure.
+ */
+ 
+int ac97_probe_codec(struct ac97_codec *codec)
+{
+	u16 id1, id2;
+	u16 audio;
+	int i;
+	char cidbuf[CODEC_ID_BUFSZ];
+	u16 f;
+	struct list_head *l;
+	struct ac97_driver *d;
+	
+	/* wait for codec-ready state */
+	if (codec->codec_wait)
+		codec->codec_wait(codec);
+	else
+		udelay(10);
+
+	/* will the codec power down if register reset ? */
+	id1 = codec->codec_read(codec, AC97_VENDOR_ID1);
+	id2 = codec->codec_read(codec, AC97_VENDOR_ID2);
+	codec->name = NULL;
+	codec->codec_ops = &null_ops;
+	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;
+			codec->flags = ac97_codec_ids[i].flags;
+			break;
+		}
+	}
+
+	codec->model = (id1 << 16) | id2;
+	if ((codec->flags & AC97_DEFAULT_POWER_OFF) == 0) {
+		/* reset codec and wait for the ready bit before we continue */
+		codec->codec_write(codec, AC97_RESET, 0L);
+		if (codec->codec_wait)
+			codec->codec_wait(codec);
+		else
+			udelay(10);
+	}
+
+	/* probing AC97 codec, AC97 2.0 says that bit 15 of register 0x00 (reset) should
+	 * be read zero.
+	 *
+	 * FIXME: is the following comment outdated?  -jgarzik
+	 * Probing of AC97 in this way is not reliable, it is not even SAFE !!
+	 */
+	if ((audio = codec->codec_read(codec, AC97_RESET)) & 0x8000) {
+		printk(KERN_ERR "ac97_codec: %s ac97 codec not present\n",
+		       (codec->id & 0x2) ? (codec->id&1 ? "4th" : "Tertiary")
+		       : (codec->id&1 ? "Secondary":  "Primary"));
+		return 0;
+	}
+	
+	/* probe for Modem Codec */
+	codec->modem = ac97_check_modem(codec);
+
+	/* enable SPDIF */
+	f = codec->codec_read(codec, AC97_EXTENDED_STATUS);
+	if((codec->codec_ops == &null_ops) && (f & 4))
+		codec->codec_ops = &default_digital_ops;
+	
+	/* A device which thinks its a modem but isnt */
+	if(codec->flags & AC97_DELUDED_MODEM)
+		codec->modem = 0;
+		
+	if (codec->name == NULL)
+		codec->name = "Unknown";
+	printk(KERN_INFO "ac97_codec: AC97 %s codec, id: %s (%s)\n", 
+		codec->modem ? "Modem" : (audio ? "Audio" : ""),
+	       codec_id(id1, id2, cidbuf), codec->name);
+
+	if(!ac97_init_mixer(codec))
+		return 0;
+		
+	/* 
+	 *	Attach last so the caller can override the mixer
+	 *	callbacks.
+	 */
+	 
+	down(&codec_sem);
+	list_add(&codec->list, &codecs);
+
+	list_for_each(l, &codec_drivers) {
+		d = list_entry(l, struct ac97_driver, list);
+		if ((codec->model ^ d->codec_id) & d->codec_mask)
+			continue;
+		if(d->probe(codec, d) == 0)
+		{
+			codec->driver = d;
+			break;
+		}
+	}
+
+	up(&codec_sem);
+	return 1;
+}
+
+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) == 0x2020)
+		codec->bit_resolution = 6;
+	else
+		codec->bit_resolution = 5;
+
+	/* 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;
+
+	/* 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);
+	}
+
+	/* codec specific initialization for 4-6 channel output or secondary codec stuff */
+	if (codec->codec_ops->init != NULL) {
+		codec->codec_ops->init(codec);
+	}
+
+	/*
+	 *	Volume is MUTE only on this device. We have to initialise
+	 *	it but its useless beyond that.
+	 */
+	if(codec->flags & AC97_NO_PCM_VOLUME)
+	{
+		codec->supported_mixers &= ~SOUND_MASK_PCM;
+		printk(KERN_WARNING "AC97 codec does not have proper volume support.\n");
+	}
+	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 cmedia_init(struct ac97_codec *codec)
+{
+	/* Initialise the CMedia 9739 */
+	/*
+		We could set various options here
+		Register 0x20 bit 0x100 sets mic as center bass
+		Also do multi_channel_ctrl &=~0x3000 |=0x1000
+		
+		For now we set up the GPIO and PC beep 
+	*/
+	
+	u16 v;
+	
+	/* MIC */
+	codec->codec_write(codec, 0x64, 0x3000);
+	v = codec->codec_read(codec, 0x64);
+	v &= ~0x8000;
+	codec->codec_write(codec, 0x64, v);
+	codec->codec_write(codec, 0x70, 0x0100);
+	codec->codec_write(codec, 0x72, 0x0020);
+	return 0;
+}
+	
+#define AC97_WM97XX_FMIXER_VOL 0x72
+#define AC97_WM97XX_RMIXER_VOL 0x74
+#define AC97_WM97XX_TEST 0x5a
+#define AC97_WM9704_RPCM_VOL 0x70
+#define AC97_WM9711_OUT3VOL 0x16
+
+static int wolfson_init03(struct ac97_codec * codec)
+{
+	/* this is known to work for the ViewSonic ViewPad 1000 */
+	codec->codec_write(codec, AC97_WM97XX_FMIXER_VOL, 0x0808);
+	codec->codec_write(codec, AC97_GENERAL_PURPOSE, 0x8000);
+	return 0;
+}
+
+static int wolfson_init04(struct ac97_codec * codec)
+{
+	codec->codec_write(codec, AC97_WM97XX_FMIXER_VOL, 0x0808);
+	codec->codec_write(codec, AC97_WM97XX_RMIXER_VOL, 0x0808);
+
+	// patch for DVD noise
+	codec->codec_write(codec, AC97_WM97XX_TEST, 0x0200);
+
+	// init vol as PCM vol
+	codec->codec_write(codec, AC97_WM9704_RPCM_VOL,
+		codec->codec_read(codec, AC97_PCMOUT_VOL));
+
+	/* set rear surround volume */
+	codec->codec_write(codec, AC97_SURROUND_MASTER, 0x0000);
+	return 0;
+}
+
+/* WM9705, WM9710 */
+static int wolfson_init05(struct ac97_codec * codec)
+{
+	/* set front mixer volume */
+	codec->codec_write(codec, AC97_WM97XX_FMIXER_VOL, 0x0808);
+	return 0;
+}
+
+/* WM9711, WM9712 */
+static int wolfson_init11(struct ac97_codec * codec)
+{
+	/* stop pop's during suspend/resume */
+	codec->codec_write(codec, AC97_WM97XX_TEST,
+		codec->codec_read(codec, AC97_WM97XX_TEST) & 0xffbf);
+
+	/* set out3 volume */
+	codec->codec_write(codec, AC97_WM9711_OUT3VOL, 0x0808);
+	return 0;
+}
+
+/* WM9713 */
+static int wolfson_init13(struct ac97_codec * codec)
+{
+	codec->codec_write(codec, AC97_RECORD_GAIN, 0x00a0);
+	codec->codec_write(codec, AC97_POWER_CONTROL, 0x0000);
+	codec->codec_write(codec, AC97_EXTENDED_MODEM_ID, 0xDA00);
+	codec->codec_write(codec, AC97_EXTEND_MODEM_STAT, 0x3810);
+	codec->codec_write(codec, AC97_PHONE_VOL, 0x0808);
+	codec->codec_write(codec, AC97_PCBEEP_VOL, 0x0808);
+
+	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;
+}
+
+
+
+/* 
+ *	Presario700 workaround 
+ * 	for Jack Sense/SPDIF Register mis-setting causing
+ *	no audible output
+ *	by Santiago Nullo 04/05/2002
+ */
+
+#define AC97_AD1886_JACK_SENSE 0x72
+
+static int ad1886_init(struct ac97_codec * codec)
+{
+	/* from AD1886 Specs */
+	codec->codec_write(codec, AC97_AD1886_JACK_SENSE, 0x0010);
+	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;
+}
+
+static int generic_digital_control(struct ac97_codec *codec, int slots, int rate, int mode)
+{
+	u16 reg;
+	
+	reg = codec->codec_read(codec, AC97_SPDIF_CONTROL);
+	
+	switch(rate)
+	{
+		/* Off by default */
+		default:
+		case 0:
+			reg = codec->codec_read(codec, AC97_EXTENDED_STATUS);
+			codec->codec_write(codec, AC97_EXTENDED_STATUS, (reg & ~AC97_EA_SPDIF));
+			if(rate == 0)
+				return 0;
+			return -EINVAL;
+		case 1:
+			reg = (reg & AC97_SC_SPSR_MASK) | AC97_SC_SPSR_48K;
+			break;
+		case 2:
+			reg = (reg & AC97_SC_SPSR_MASK) | AC97_SC_SPSR_44K;
+			break;
+		case 3:
+			reg = (reg & AC97_SC_SPSR_MASK) | AC97_SC_SPSR_32K;
+			break;
+	}
+	
+	reg &= ~AC97_SC_CC_MASK;
+	reg |= (mode & AUDIO_CCMASK) << 6;
+	
+	if(mode & AUDIO_DIGITAL)
+		reg |= 2;
+	if(mode & AUDIO_PRO)
+		reg |= 1;
+	if(mode & AUDIO_DRS)
+		reg |= 0x4000;
+
+	codec->codec_write(codec, AC97_SPDIF_CONTROL, reg);
+
+	reg = codec->codec_read(codec, AC97_EXTENDED_STATUS);
+	reg &= (AC97_EA_SLOT_MASK);
+	reg |= AC97_EA_VRA | AC97_EA_SPDIF | slots;
+	codec->codec_write(codec, AC97_EXTENDED_STATUS, reg);
+	
+	reg = codec->codec_read(codec, AC97_EXTENDED_STATUS);
+	if(!(reg & 0x0400))
+	{
+		codec->codec_write(codec, AC97_EXTENDED_STATUS, reg & ~ AC97_EA_SPDIF);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ *	Crystal digital audio control (CS4299)
+ */
+ 
+static int crystal_digital_control(struct ac97_codec *codec, int slots, int rate, int mode)
+{
+	u16 cv;
+
+	if(mode & AUDIO_DIGITAL)
+		return -EINVAL;
+		
+	switch(rate)
+	{
+		case 0: cv = 0x0; break;	/* SPEN off */
+		case 48000: cv = 0x8004; break;	/* 48KHz digital */
+		case 44100: cv = 0x8104; break;	/* 44.1KHz digital */
+		case 32768: 			/* 32Khz */
+		default:
+			return -EINVAL;
+	}
+	codec->codec_write(codec, 0x68, cv);
+	return 0;
+}
+
+/*
+ *	CMedia digital audio control
+ *	Needs more work.
+ */
+ 
+static int cmedia_digital_control(struct ac97_codec *codec, int slots, int rate, int mode)
+{
+	u16 cv;
+
+	if(mode & AUDIO_DIGITAL)
+		return -EINVAL;
+		
+	switch(rate)
+	{
+		case 0:		cv = 0x0001; break;	/* SPEN off */
+		case 48000:	cv = 0x0009; break;	/* 48KHz digital */
+		default:
+			return -EINVAL;
+	}
+	codec->codec_write(codec, 0x2A, 0x05c4);
+	codec->codec_write(codec, 0x6C, cv);
+	
+	/* Switch on mix to surround */
+	cv = codec->codec_read(codec, 0x64);
+	cv &= ~0x0200;
+	if(mode)
+		cv |= 0x0200;
+	codec->codec_write(codec, 0x64, 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);
+
+/**
+ *	ac97_register_driver	-	register a codec helper
+ *	@driver: Driver handler
+ *
+ *	Register a handler for codecs matching the codec id. The handler
+ *	attach function is called for all present codecs and will be 
+ *	called when new codecs are discovered.
+ */
+ 
+int ac97_register_driver(struct ac97_driver *driver)
+{
+	struct list_head *l;
+	struct ac97_codec *c;
+	
+	down(&codec_sem);
+	INIT_LIST_HEAD(&driver->list);
+	list_add(&driver->list, &codec_drivers);
+	
+	list_for_each(l, &codecs)
+	{
+		c = list_entry(l, struct ac97_codec, list);
+		if(c->driver != NULL || ((c->model ^ driver->codec_id) & driver->codec_mask))
+			continue;
+		if(driver->probe(c, driver))
+			continue;
+		c->driver = driver;
+	}
+	up(&codec_sem);
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(ac97_register_driver);
+
+/**
+ *	ac97_unregister_driver	-	unregister a codec helper
+ *	@driver: Driver handler
+ *
+ *	Unregister a handler for codecs matching the codec id. The handler
+ *	remove function is called for all matching codecs.
+ */
+ 
+void ac97_unregister_driver(struct ac97_driver *driver)
+{
+	struct list_head *l;
+	struct ac97_codec *c;
+	
+	down(&codec_sem);
+	list_del_init(&driver->list);
+
+	list_for_each(l, &codecs)
+	{
+		c = list_entry(l, struct ac97_codec, list);
+		if (c->driver == driver) {
+			driver->remove(c, driver);
+			c->driver = NULL;
+		}
+	}
+	
+	up(&codec_sem);
+}
+
+EXPORT_SYMBOL_GPL(ac97_unregister_driver);
+
+static int swap_headphone(int remove_master)
+{
+	struct list_head *l;
+	struct ac97_codec *c;
+	
+	if (remove_master) {
+		down(&codec_sem);
+		list_for_each(l, &codecs)
+		{
+			c = list_entry(l, struct ac97_codec, list);
+			if (supported_mixer(c, SOUND_MIXER_PHONEOUT))
+				c->supported_mixers &= ~SOUND_MASK_PHONEOUT;
+		}
+		up(&codec_sem);
+	} else
+		ac97_hw[SOUND_MIXER_PHONEOUT].offset = AC97_MASTER_VOL_STEREO;
+
+	/* Scale values already match */
+	ac97_hw[SOUND_MIXER_VOLUME].offset = AC97_MASTER_VOL_MONO;
+	return 0;
+}
+
+static int apply_quirk(int quirk)
+{
+	switch (quirk) {
+	case AC97_TUNE_NONE:
+		return 0;
+	case AC97_TUNE_HP_ONLY:
+		return swap_headphone(1);
+	case AC97_TUNE_SWAP_HP:
+		return swap_headphone(0);
+	case AC97_TUNE_SWAP_SURROUND:
+		return -ENOSYS; /* not yet implemented */
+	case AC97_TUNE_AD_SHARING:
+		return -ENOSYS; /* not yet implemented */
+	case AC97_TUNE_ALC_JACK:
+		return -ENOSYS; /* not yet implemented */
+	}
+	return -EINVAL;
+}
+
+/**
+ *	ac97_tune_hardware - tune up the hardware
+ *	@pdev: pci_dev pointer
+ *	@quirk: quirk list
+ *	@override: explicit quirk value (overrides if not AC97_TUNE_DEFAULT)
+ *
+ *	Do some workaround for each pci device, such as renaming of the
+ *	headphone (true line-out) control as "Master".
+ *	The quirk-list must be terminated with a zero-filled entry.
+ *
+ *	Returns zero if successful, or a negative error code on failure.
+ */
+
+int ac97_tune_hardware(struct pci_dev *pdev, struct ac97_quirk *quirk, int override)
+{
+	int result;
+
+	if (!quirk)
+		return -EINVAL;
+
+	if (override != AC97_TUNE_DEFAULT) {
+		result = apply_quirk(override);
+		if (result < 0)
+			printk(KERN_ERR "applying quirk type %d failed (%d)\n", override, result);
+		return result;
+	}
+
+	for (; quirk->vendor; quirk++) {
+		if (quirk->vendor != pdev->subsystem_vendor)
+			continue;
+		if ((! quirk->mask && quirk->device == pdev->subsystem_device) ||
+		    quirk->device == (quirk->mask & pdev->subsystem_device)) {
+#ifdef DEBUG
+			printk("ac97 quirk for %s (%04x:%04x)\n", quirk->name, ac97->subsystem_vendor, pdev->subsystem_device);
+#endif
+			result = apply_quirk(quirk->type);
+			if (result < 0)
+				printk(KERN_ERR "applying quirk type %d for %s failed (%d)\n", quirk->type, quirk->name, result);
+			return result;
+		}
+	}
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(ac97_tune_hardware);
+
+MODULE_LICENSE("GPL");