/*
 * programming the msp34* sound processor family
 *
 * (c) 1997-2001 Gerd Knorr <kraxel@bytesex.org>
 *
 * what works and what doesn't:
 *
 *  AM-Mono
 *      Support for Hauppauge cards added (decoding handled by tuner) added by
 *      Frederic Crozat <fcrozat@mail.dotcom.fr>
 *
 *  FM-Mono
 *      should work. The stereo modes are backward compatible to FM-mono,
 *      therefore FM-Mono should be allways available.
 *
 *  FM-Stereo (B/G, used in germany)
 *      should work, with autodetect
 *
 *  FM-Stereo (satellite)
 *      should work, no autodetect (i.e. default is mono, but you can
 *      switch to stereo -- untested)
 *
 *  NICAM (B/G, L , used in UK, Scandinavia, Spain and France)
 *      should work, with autodetect. Support for NICAM was added by
 *      Pekka Pietikainen <pp@netppl.fi>
 *
 *
 * TODO:
 *   - better SAT support
 *
 *
 * 980623  Thomas Sailer (sailer@ife.ee.ethz.ch)
 *         using soundcore instead of OSS
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include <asm/semaphore.h>
#include <linux/init.h>

#ifdef CONFIG_SMP
#include <asm/pgtable.h>
#include <linux/smp_lock.h>
#endif
/* kernel_thread */
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>

#include "audiochip.h"
#include "msp3400.h"

/* Addresses to scan */
static unsigned short normal_i2c[] = {I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {0x40,0x40,I2C_CLIENT_END};
static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
	normal_i2c, normal_i2c_range, 
	probe, probe_range, 
	ignore, ignore_range, 
	force
};

/* insmod parameters */
static int debug   = 0;    /* debug output */
static int once    = 0;    /* no continous stereo monitoring */
static int amsound = 0;    /* hard-wire AM sound at 6.5 Hz (france),
			      the autoscan seems work well only with FM... */
static int simple  = -1;   /* use short programming (>= msp3410 only) */
static int dolby   = 0;

#define DFP_COUNT 0x41
static const int bl_dfp[] = {
	0x00, 0x01, 0x02, 0x03,  0x06, 0x08, 0x09, 0x0a,
	0x0b, 0x0d, 0x0e, 0x10
};

struct msp3400c {
	int simple;
	int nicam;
	int mode;
	int norm;
	int stereo;
	int nicam_on;
	int acb;
	int main, second;	/* sound carrier */
	int input;

	int muted;
	int left, right;	/* volume */
	int bass, treble;

	/* shadow register set */
	int dfp_regs[DFP_COUNT];

	/* thread */
	struct task_struct  *thread;
	wait_queue_head_t    wq;

	struct semaphore    *notify;
	int                  active,restart,rmmod;

	int                  watch_stereo;
	struct timer_list    wake_stereo;
};

#define MSP3400_MAX 4
static struct i2c_client *msps[MSP3400_MAX];

#define VIDEO_MODE_RADIO 16      /* norm magic for radio mode */

/* ---------------------------------------------------------------------- */

#define dprintk     if (debug) printk

MODULE_PARM(once,"i");
MODULE_PARM(debug,"i");
MODULE_PARM(simple,"i");
MODULE_PARM(amsound,"i");
MODULE_PARM(dolby,"i");

MODULE_DESCRIPTION("device driver for msp34xx TV sound processor");
MODULE_AUTHOR("Gerd Knorr");
MODULE_LICENSE("GPL");

/* ---------------------------------------------------------------------- */

#define I2C_MSP3400C       0x80
#define I2C_MSP3400C_DEM   0x10
#define I2C_MSP3400C_DFP   0x12

/* ----------------------------------------------------------------------- */
/* functions for talking to the MSP3400C Sound processor                   */

static int msp3400c_reset(struct i2c_client *client)
{
        static char reset_off[3] = { 0x00, 0x80, 0x00 };
        static char reset_on[3]  = { 0x00, 0x00, 0x00 };

        i2c_master_send(client,reset_off,3);  /* XXX ignore errors here */
        if (3 != i2c_master_send(client,reset_on, 3)) {
		printk(KERN_ERR "msp3400: chip reset failed, penguin on i2c bus?\n");
                return -1;
	}
        return 0;
}

static int
msp3400c_read(struct i2c_client *client, int dev, int addr)
{
	int err;

        unsigned char write[3];
        unsigned char read[2];
        struct i2c_msg msgs[2] = {
                { client->addr, 0,        3, write },
                { client->addr, I2C_M_RD, 2, read  }
        };
        write[0] = dev+1;
        write[1] = addr >> 8;
        write[2] = addr & 0xff;

	for (err = 0; err < 3;) {
		if (2 == i2c_transfer(client->adapter,msgs,2))
			break;
		err++;
		printk(KERN_WARNING "msp34xx: I/O error #%d (read 0x%02x/0x%02x)\n",
		       err, dev, addr);
		current->state = TASK_INTERRUPTIBLE;
		schedule_timeout(HZ/10);
	}
	if (3 == err) {
		printk(KERN_WARNING "msp34xx: giving up, reseting chip. Sound will go off, sorry folks :-|\n");
		msp3400c_reset(client);
		return -1;
	}
        return read[0] << 8 | read[1];
}

static int
msp3400c_write(struct i2c_client *client, int dev, int addr, int val)
{
	int err;
        unsigned char buffer[5];

        buffer[0] = dev;
        buffer[1] = addr >> 8;
        buffer[2] = addr &  0xff;
        buffer[3] = val  >> 8;
        buffer[4] = val  &  0xff;

	for (err = 0; err < 3;) {
		if (5 == i2c_master_send(client, buffer, 5))
			break;
		err++;
		printk(KERN_WARNING "msp34xx: I/O error #%d (write 0x%02x/0x%02x)\n",
		       err, dev, addr);
		current->state = TASK_INTERRUPTIBLE;
		schedule_timeout(HZ/10);
	}
	if (3 == err) {
		printk(KERN_WARNING "msp34xx: giving up, reseting chip. Sound will go off, sorry folks :-|\n");
		msp3400c_reset(client);
		return -1;
	}
	return 0;
}

/* ------------------------------------------------------------------------ */

/* This macro is allowed for *constants* only, gcc must calculate it
   at compile time.  Remember -- no floats in kernel mode */
#define MSP_CARRIER(freq) ((int)((float)(freq/18.432)*(1<<24)))

#define MSP_MODE_AM_DETECT   0
#define MSP_MODE_FM_RADIO    2
#define MSP_MODE_FM_TERRA    3
#define MSP_MODE_FM_SAT      4
#define MSP_MODE_FM_NICAM1   5
#define MSP_MODE_FM_NICAM2   6
#define MSP_MODE_AM_NICAM    7
#define MSP_MODE_BTSC        8
#define MSP_MODE_EXTERN      9

static struct MSP_INIT_DATA_DEM {
	int fir1[6];
	int fir2[6];
	int cdo1;
	int cdo2;
	int ad_cv;
	int mode_reg;
	int dfp_src;
	int dfp_matrix;
} msp_init_data[] = {
	/* AM (for carrier detect / msp3400) */
	{ { 75, 19, 36, 35, 39, 40 }, { 75, 19, 36, 35, 39, 40 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0500,   0x0020, 0x3000},

	/* AM (for carrier detect / msp3410) */
	{ { -1, -1, -8, 2, 59, 126 }, { -1, -1, -8, 2, 59, 126 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0100,   0x0020, 0x3000},

	/* FM Radio */
	{ { -8, -8, 4, 6, 78, 107 }, { -8, -8, 4, 6, 78, 107 },
	  MSP_CARRIER(10.7), MSP_CARRIER(10.7),
	  0x00d0, 0x0480, 0x0020, 0x3000 },

	/* Terrestial FM-mono + FM-stereo */
	{ {  3, 18, 27, 48, 66, 72 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0480,   0x0030, 0x3000},

	/* Sat FM-mono */
	{ {  1,  9, 14, 24, 33, 37 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(6.5), MSP_CARRIER(6.5),
	  0x00c6, 0x0480,   0x0000, 0x3000},

	/* NICAM/FM --  B/G (5.5/5.85), D/K (6.5/5.85) */
	{ { -2, -8, -10, 10, 50, 86 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(5.5), MSP_CARRIER(5.5),
	  0x00d0, 0x0040,   0x0120, 0x3000},

	/* NICAM/FM -- I (6.0/6.552) */
	{ {  2, 4, -6, -4, 40, 94 }, {  3, 18, 27, 48, 66, 72 },
	  MSP_CARRIER(6.0), MSP_CARRIER(6.0),
	  0x00d0, 0x0040,   0x0120, 0x3000},

	/* NICAM/AM -- L (6.5/5.85) */
	{ {  -2, -8, -10, 10, 50, 86 }, {  -4, -12, -9, 23, 79, 126 },
	  MSP_CARRIER(6.5), MSP_CARRIER(6.5),
	  0x00c6, 0x0140,   0x0120, 0x7c03},
};

struct CARRIER_DETECT {
	int   cdo;
	char *name;
};

static struct CARRIER_DETECT carrier_detect_main[] = {
	/* main carrier */
	{ MSP_CARRIER(4.5),        "4.5   NTSC"                   }, 
	{ MSP_CARRIER(5.5),        "5.5   PAL B/G"                }, 
	{ MSP_CARRIER(6.0),        "6.0   PAL I"                  },
	{ MSP_CARRIER(6.5),        "6.5   PAL D/K + SAT + SECAM"  }
};

static struct CARRIER_DETECT carrier_detect_55[] = {
	/* PAL B/G */
	{ MSP_CARRIER(5.7421875),  "5.742 PAL B/G FM-stereo"     }, 
	{ MSP_CARRIER(5.85),       "5.85  PAL B/G NICAM"         }
};

static struct CARRIER_DETECT carrier_detect_65[] = {
	/* PAL SAT / SECAM */
	{ MSP_CARRIER(5.85),       "5.85  PAL D/K + SECAM NICAM" },
	{ MSP_CARRIER(6.2578125),  "6.25  PAL D/K1 FM-stereo" },
	{ MSP_CARRIER(6.7421875),  "6.74  PAL D/K2 FM-stereo" },
	{ MSP_CARRIER(7.02),       "7.02  PAL SAT FM-stereo s/b" },
	{ MSP_CARRIER(7.20),       "7.20  PAL SAT FM-stereo s"   },
	{ MSP_CARRIER(7.38),       "7.38  PAL SAT FM-stereo b"   },
};

#define CARRIER_COUNT(x) (sizeof(x)/sizeof(struct CARRIER_DETECT))

/* ----------------------------------------------------------------------- */

#define SCART_MASK    0
#define SCART_IN1     1
#define SCART_IN2     2
#define SCART_IN1_DA  3
#define SCART_IN2_DA  4
#define SCART_IN3     5
#define SCART_IN4     6
#define SCART_MONO    7
#define SCART_MUTE    8

static int scarts[3][9] = {
  /* MASK    IN1     IN2     IN1_DA  IN2_DA  IN3     IN4     MONO    MUTE   */
  {  0x0320, 0x0000, 0x0200, -1,     -1,     0x0300, 0x0020, 0x0100, 0x0320 },
  {  0x0c40, 0x0440, 0x0400, 0x0c00, 0x0040, 0x0000, 0x0840, 0x0800, 0x0c40 },
  {  0x3080, 0x1000, 0x1080, 0x0000, 0x0080, 0x2080, 0x3080, 0x2000, 0x3000 },
};

static char *scart_names[] = {
  "mask", "in1", "in2", "in1 da", "in2 da", "in3", "in4", "mono", "mute"
};

static void
msp3400c_set_scart(struct i2c_client *client, int in, int out)
{
	struct msp3400c *msp = client->data;

	if (-1 == scarts[out][in])
		return;

	dprintk("msp34xx: scart switch: %s => %d\n",scart_names[in],out);
	msp->acb &= ~scarts[out][SCART_MASK];
	msp->acb |=  scarts[out][in];
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0013, msp->acb);
}

/* ------------------------------------------------------------------------ */

static void msp3400c_setcarrier(struct i2c_client *client, int cdo1, int cdo2)
{
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0093, cdo1 & 0xfff);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x009b, cdo1 >> 12);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x00a3, cdo2 & 0xfff);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x00ab, cdo2 >> 12);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0056, 0); /*LOAD_REG_1/2*/
}

static void msp3400c_setvolume(struct i2c_client *client,
			       int muted, int left, int right)
{
	int vol = 0,val = 0,balance = 0;

	if (!muted) {
		vol     = (left > right) ? left : right;
		val     = (vol * 0x73 / 65535) << 8;
	}
	if (vol > 0) {
		balance = ((right-left) * 127) / vol;
	}

	dprintk("msp34xx: setvolume: mute=%s %d:%d  v=0x%02x b=0x%02x\n",
		muted ? "on" : "off", left, right, val>>8, balance);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0000, val); /* loudspeaker */
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0006, val); /* headphones  */
	/* scart - on/off only */
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0007, val ? 0x4000 : 0);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0001, balance << 8);
}

static void msp3400c_setbass(struct i2c_client *client, int bass)
{
	int val = ((bass-32768) * 0x60 / 65535) << 8;

	dprintk("msp34xx: setbass: %d 0x%02x\n",bass, val>>8);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0002, val); /* loudspeaker */
}

static void msp3400c_settreble(struct i2c_client *client, int treble)
{
	int val = ((treble-32768) * 0x60 / 65535) << 8;

	dprintk("msp34xx: settreble: %d 0x%02x\n",treble, val>>8);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0003, val); /* loudspeaker */
}

static void msp3400c_setmode(struct i2c_client *client, int type)
{
	struct msp3400c *msp = client->data;
	int i;
	
	dprintk("msp3400: setmode: %d\n",type);
	msp->mode   = type;
	msp->stereo = VIDEO_SOUND_MONO;

	msp3400c_write(client,I2C_MSP3400C_DEM, 0x00bb,          /* ad_cv */
		       msp_init_data[type].ad_cv);
    
	for (i = 5; i >= 0; i--)                                   /* fir 1 */
		msp3400c_write(client,I2C_MSP3400C_DEM, 0x0001,
			       msp_init_data[type].fir1[i]);
    
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0005, 0x0004); /* fir 2 */
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0005, 0x0040);
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0005, 0x0000);
	for (i = 5; i >= 0; i--)
		msp3400c_write(client,I2C_MSP3400C_DEM, 0x0005,
			       msp_init_data[type].fir2[i]);
    
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0083,     /* MODE_REG */
		       msp_init_data[type].mode_reg);
    
	msp3400c_setcarrier(client, msp_init_data[type].cdo1,
			    msp_init_data[type].cdo2);
    
	msp3400c_write(client,I2C_MSP3400C_DEM, 0x0056, 0); /*LOAD_REG_1/2*/

	if (dolby) {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,
			       0x0520); /* I2S1 */
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,
			       0x0620); /* I2S2 */
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,
			       msp_init_data[type].dfp_src);
	} else {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,
			       msp_init_data[type].dfp_src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,
			       msp_init_data[type].dfp_src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,
			       msp_init_data[type].dfp_src);
	}
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x000a,
		       msp_init_data[type].dfp_src);
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x000e,
		       msp_init_data[type].dfp_matrix);

	if (msp->nicam) {
		/* nicam prescale */
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0010, 0x5a00); /* was: 0x3000 */
	}
}

/* turn on/off nicam + stereo */
static void msp3400c_setstereo(struct i2c_client *client, int mode)
{
	static char *strmode[] = { "0", "mono", "stereo", "3",
				   "lang1", "5", "6", "7", "lang2" };
	struct msp3400c *msp = client->data;
	int nicam=0; /* channel source: FM/AM or nicam */
	int src=0;

	/* switch demodulator */
	switch (msp->mode) {
	case MSP_MODE_FM_TERRA:
		dprintk("msp3400: FM setstereo: %s\n",strmode[mode]);
		msp3400c_setcarrier(client,msp->second,msp->main);
		switch (mode) {
		case VIDEO_SOUND_STEREO:
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x000e, 0x3001);
			break;
		case VIDEO_SOUND_MONO:
		case VIDEO_SOUND_LANG1:
		case VIDEO_SOUND_LANG2:
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x000e, 0x3000);
			break;
		}
		break;
	case MSP_MODE_FM_SAT:
		dprintk("msp3400: SAT setstereo: %s\n",strmode[mode]);
		switch (mode) {
		case VIDEO_SOUND_MONO:
			msp3400c_setcarrier(client, MSP_CARRIER(6.5), MSP_CARRIER(6.5));
			break;
		case VIDEO_SOUND_STEREO:
			msp3400c_setcarrier(client, MSP_CARRIER(7.2), MSP_CARRIER(7.02));
			break;
		case VIDEO_SOUND_LANG1:
			msp3400c_setcarrier(client, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
			break;
		case VIDEO_SOUND_LANG2:
			msp3400c_setcarrier(client, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
			break;
		}
		break;
	case MSP_MODE_FM_NICAM1:
	case MSP_MODE_FM_NICAM2:
	case MSP_MODE_AM_NICAM:
		dprintk("msp3400: NICAM setstereo: %s\n",strmode[mode]);
		msp3400c_setcarrier(client,msp->second,msp->main);
		if (msp->nicam_on)
			nicam=0x0100;
		break;
	case MSP_MODE_BTSC:
		dprintk("msp3400: BTSC setstereo: %s\n",strmode[mode]);
		nicam=0x0300;
		break;
	case MSP_MODE_EXTERN:
		dprintk("msp3400: extern setstereo: %s\n",strmode[mode]);
		nicam = 0x0200;
		break;
	case MSP_MODE_FM_RADIO:
		dprintk("msp3400: FM-Radio setstereo: %s\n",strmode[mode]);
		break;
	default:
		dprintk("msp3400: mono setstereo\n");
		return;
	}

	/* switch audio */
	switch (mode) {
	case VIDEO_SOUND_STEREO:
		src = 0x0020 | nicam;
#if 0 
		/* spatial effect */
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0005,0x4000);
#endif
		break;
	case VIDEO_SOUND_MONO:
		if (msp->mode == MSP_MODE_AM_NICAM) {
			dprintk("msp3400: switching to AM mono\n");
			/* AM mono decoding is handled by tuner, not MSP chip */
			/* SCART switching control register */
			msp3400c_set_scart(client,SCART_MONO,0);
			src = 0x0200;
			break;
		}
	case VIDEO_SOUND_LANG1:
		src = 0x0000 | nicam;
		break;
	case VIDEO_SOUND_LANG2:
		src = 0x0010 | nicam;
		break;
	}
	dprintk("msp3400: setstereo final source/matrix = 0x%x\n", src);

	if (dolby) {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,0x0520);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,0x0620);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000a,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,src);
	} else {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000a,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,src);
	}
}

static void
msp3400c_print_mode(struct msp3400c *msp)
{
	if (msp->main == msp->second) {
		printk("msp3400: mono sound carrier: %d.%03d MHz\n",
		       msp->main/910000,(msp->main/910)%1000);
	} else {
		printk("msp3400: main sound carrier: %d.%03d MHz\n",
		       msp->main/910000,(msp->main/910)%1000);
	}
	if (msp->mode == MSP_MODE_FM_NICAM1 ||
	    msp->mode == MSP_MODE_FM_NICAM2)
		printk("msp3400: NICAM/FM carrier   : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	if (msp->mode == MSP_MODE_AM_NICAM)
		printk("msp3400: NICAM/AM carrier   : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	if (msp->mode == MSP_MODE_FM_TERRA &&
	    msp->main != msp->second) {
		printk("msp3400: FM-stereo carrier : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	}
}

static void
msp3400c_restore_dfp(struct i2c_client *client)
{
	struct msp3400c *msp = client->data;
	int i;

	for (i = 0; i < DFP_COUNT; i++) {
		if (-1 == msp->dfp_regs[i])
			continue;
		msp3400c_write(client,I2C_MSP3400C_DFP, i, msp->dfp_regs[i]);
	}
}

/* ----------------------------------------------------------------------- */

struct REGISTER_DUMP {
	int   addr;
	char *name;
};

struct REGISTER_DUMP d1[] = {
	{ 0x007e, "autodetect" },
	{ 0x0023, "C_AD_BITS " },
	{ 0x0038, "ADD_BITS  " },
	{ 0x003e, "CIB_BITS  " },
	{ 0x0057, "ERROR_RATE" },
};

static int
autodetect_stereo(struct i2c_client *client)
{
	struct msp3400c *msp = client->data;
	int val;
	int newstereo = msp->stereo;
	int newnicam  = msp->nicam_on;
	int update = 0;

	switch (msp->mode) {
	case MSP_MODE_FM_TERRA:
		val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x18);
		if (val > 32767)
			val -= 65536;
		dprintk("msp34xx: stereo detect register: %d\n",val);
		
		if (val > 4096) {
			newstereo = VIDEO_SOUND_STEREO | VIDEO_SOUND_MONO;
		} else if (val < -4096) {
			newstereo = VIDEO_SOUND_LANG1 | VIDEO_SOUND_LANG2;
		} else {
			newstereo = VIDEO_SOUND_MONO;
		}
		newnicam = 0;
		break;
	case MSP_MODE_FM_NICAM1:
	case MSP_MODE_FM_NICAM2:
	case MSP_MODE_AM_NICAM:
		val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x23);
		dprintk("msp34xx: nicam sync=%d, mode=%d\n",val & 1, (val & 0x1e) >> 1);

		if (val & 1) {
			/* nicam synced */
			switch ((val & 0x1e) >> 1)  {
			case 0:
			case 8:
				newstereo = VIDEO_SOUND_STEREO;
				break;
			case 1:
			case 9:
				newstereo = VIDEO_SOUND_MONO
					| VIDEO_SOUND_LANG1;
				break;
			case 2:
			case 10:
				newstereo = VIDEO_SOUND_MONO
					| VIDEO_SOUND_LANG1
					| VIDEO_SOUND_LANG2;
				break;
			default:
				newstereo = VIDEO_SOUND_MONO;
				break;
			}
			newnicam=1;
		} else {
			newnicam = 0;
			newstereo = VIDEO_SOUND_MONO;
		}
		break;
	case MSP_MODE_BTSC:
		val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x200);
		dprintk("msp3410: status=0x%x (pri=%s, sec=%s, %s%s%s)\n",
			val,
			(val & 0x0002) ? "no"     : "yes",
			(val & 0x0004) ? "no"     : "yes",
			(val & 0x0040) ? "stereo" : "mono",
			(val & 0x0080) ? ", nicam 2nd mono" : "",
			(val & 0x0100) ? ", bilingual/SAP"  : "");
		newstereo = VIDEO_SOUND_MONO;
		if (val & 0x0040) newstereo |= VIDEO_SOUND_STEREO;
		if (val & 0x0100) newstereo |= VIDEO_SOUND_LANG1;
		break;
	}
	if (newstereo != msp->stereo) {
		update = 1;
		dprintk("msp34xx: watch: stereo %d => %d\n",
			msp->stereo,newstereo);
		msp->stereo   = newstereo;
	}
	if (newnicam != msp->nicam_on) {
		update = 1;
		dprintk("msp34xx: watch: nicam %d => %d\n",
			msp->nicam_on,newnicam);
		msp->nicam_on = newnicam;
	}
	return update;
}

/*
 * A kernel thread for msp3400 control -- we don't want to block the
 * in the ioctl while doing the sound carrier & stereo detect
 */

static void msp3400c_stereo_wake(unsigned long data)
{
	struct msp3400c *msp = (struct msp3400c*)data;   /* XXX alpha ??? */

	wake_up_interruptible(&msp->wq);
}

/* stereo/multilang monitoring */
static void watch_stereo(struct i2c_client *client)
{
	struct msp3400c *msp = client->data;

	if (autodetect_stereo(client)) {
		if (msp->stereo & VIDEO_SOUND_STEREO)
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
		else if (msp->stereo & VIDEO_SOUND_LANG1)
			msp3400c_setstereo(client,VIDEO_SOUND_LANG1);
		else
			msp3400c_setstereo(client,VIDEO_SOUND_MONO);
	}
	if (once)
		msp->watch_stereo = 0;
	if (msp->watch_stereo)
		mod_timer(&msp->wake_stereo, jiffies+5*HZ);
}

static int msp3400c_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp3400c *msp = client->data;
	
	struct CARRIER_DETECT *cd;
	int count, max1,max2,val1,val2, val,this;
	
#ifdef CONFIG_SMP
	lock_kernel();
#endif
	
	daemonize();
	sigfillset(&current->blocked);
	strcpy(current->comm,"msp3400");

	msp->thread = current;

#ifdef CONFIG_SMP
	unlock_kernel();
#endif

	printk("msp3400: daemon started\n");
	if(msp->notify != NULL)
		up(msp->notify);

	for (;;) {
		if (msp->rmmod)
			goto done;
		if (debug > 1)
			printk("msp3400: thread: sleep\n");
		interruptible_sleep_on(&msp->wq);
		if (debug > 1)
			printk("msp3400: thread: wakeup\n");
		if (msp->rmmod || signal_pending(current))
			goto done;

		if (VIDEO_MODE_RADIO == msp->norm ||
		    MSP_MODE_EXTERN  == msp->mode)
			continue;  /* nothing to do */
	
		msp->active = 1;

		if (msp->watch_stereo) {
			watch_stereo(client);
			msp->active = 0;
			continue;
		}

		/* some time for the tuner to sync */
		current->state   = TASK_INTERRUPTIBLE;
		schedule_timeout(HZ/5);
		if (signal_pending(current))
			goto done;
		
	restart:
		if (VIDEO_MODE_RADIO == msp->norm ||
		    MSP_MODE_EXTERN  == msp->mode)
			continue;  /* nothing to do */
		msp->restart = 0;
		msp3400c_setvolume(client, msp->muted, 0, 0);
		msp3400c_setmode(client, MSP_MODE_AM_DETECT /* +1 */ );
		val1 = val2 = 0;
		max1 = max2 = -1;
		del_timer(&msp->wake_stereo);
		msp->watch_stereo = 0;

		/* carrier detect pass #1 -- main carrier */
		cd = carrier_detect_main; count = CARRIER_COUNT(carrier_detect_main);

		if (amsound && (msp->norm == VIDEO_MODE_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			max1 = 3;
			count = 0;
			dprintk("msp3400: AM sound override\n");
		}

		for (this = 0; this < count; this++) {
			msp3400c_setcarrier(client, cd[this].cdo,cd[this].cdo);

			current->state   = TASK_INTERRUPTIBLE;
			schedule_timeout(HZ/10);
			if (signal_pending(current))
				goto done;
			if (msp->restart)
				msp->restart = 0;

			val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val1 < val)
				val1 = val, max1 = this;
			dprintk("msp3400: carrier1 val: %5d / %s\n", val,cd[this].name);
		}
	
		/* carrier detect pass #2 -- second (stereo) carrier */
		switch (max1) {
		case 1: /* 5.5 */
			cd = carrier_detect_55; count = CARRIER_COUNT(carrier_detect_55);
			break;
		case 3: /* 6.5 */
			cd = carrier_detect_65; count = CARRIER_COUNT(carrier_detect_65);
			break;
		case 0: /* 4.5 */
		case 2: /* 6.0 */
		default:
			cd = NULL; count = 0;
			break;
		}
		
		if (amsound && (msp->norm == VIDEO_MODE_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			cd = NULL; count = 0; max2 = 0;
		}
		for (this = 0; this < count; this++) {
			msp3400c_setcarrier(client, cd[this].cdo,cd[this].cdo);

			current->state   = TASK_INTERRUPTIBLE;
			schedule_timeout(HZ/10);
			if (signal_pending(current))
				goto done;
			if (msp->restart)
				goto restart;

			val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val2 < val)
				val2 = val, max2 = this;
			dprintk("msp3400: carrier2 val: %5d / %s\n", val,cd[this].name);
		}

		/* programm the msp3400 according to the results */
		msp->main   = carrier_detect_main[max1].cdo;
		switch (max1) {
		case 1: /* 5.5 */
			if (max2 == 0) {
				/* B/G FM-stereo */
				msp->second = carrier_detect_55[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_TERRA);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp->watch_stereo = 1;
			} else if (max2 == 1 && msp->nicam) {
				/* B/G NICAM */
				msp->second = carrier_detect_55[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_NICAM1);
				msp->nicam_on = 1;
				msp3400c_setcarrier(client, msp->second, msp->main);
				msp->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 2: /* 6.0 */
			/* PAL I NICAM */
			msp->second = MSP_CARRIER(6.552);
			msp3400c_setmode(client, MSP_MODE_FM_NICAM2);
			msp->nicam_on = 1;
			msp3400c_setcarrier(client, msp->second, msp->main);
			msp->watch_stereo = 1;
			break;
		case 3: /* 6.5 */
			if (max2 == 1 || max2 == 2) {
				/* D/K FM-stereo */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_TERRA);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp->watch_stereo = 1;
			} else if (max2 == 0 &&
				   msp->norm == VIDEO_MODE_SECAM) {
				/* L NICAM or AM-mono */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_AM_NICAM);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp3400c_setcarrier(client, msp->second, msp->main);
				/* volume prescale for SCART (AM mono input) */
				msp3400c_write(client,I2C_MSP3400C_DFP, 0x000d, 0x1900);
				msp->watch_stereo = 1;
			} else if (max2 == 0 && msp->nicam) {
				/* D/K NICAM */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_NICAM1);
				msp->nicam_on = 1;
				msp3400c_setcarrier(client, msp->second, msp->main);
				msp->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 0: /* 4.5 */
		default:
		no_second:
			msp->second = carrier_detect_main[max1].cdo;
			msp3400c_setmode(client, MSP_MODE_FM_TERRA);
			msp->nicam_on = 0;
			msp3400c_setcarrier(client, msp->second, msp->main);
			msp->stereo = VIDEO_SOUND_MONO;
			msp3400c_setstereo(client, VIDEO_SOUND_MONO);
			break;
		}

		/* unmute + restore dfp registers */
		msp3400c_setvolume(client, msp->muted, msp->left, msp->right);
		msp3400c_restore_dfp(client);

		if (msp->watch_stereo)
			mod_timer(&msp->wake_stereo, jiffies+5*HZ);

		if (debug)
			msp3400c_print_mode(msp);
		
		msp->active = 0;
	}

done:
	dprintk("msp3400: thread: exit\n");
	msp->active = 0;
	msp->thread = NULL;

	if(msp->notify != NULL)
		up(msp->notify);
	return 0;
}

/* ----------------------------------------------------------------------- */
/* this one uses the automatic sound standard detection of newer           */
/* msp34xx chip versions                                                   */

static struct MODES {
	int retval;
	int main, second;
	char *name;
} modelist[] = {
	{ 0x0000, 0, 0, "ERROR" },
	{ 0x0001, 0, 0, "autodetect start" },
	{ 0x0002, MSP_CARRIER(4.5), MSP_CARRIER(4.72), "4.5/4.72  M Dual FM-Stereo" },
	{ 0x0003, MSP_CARRIER(5.5), MSP_CARRIER(5.7421875), "5.5/5.74  B/G Dual FM-Stereo" },
	{ 0x0004, MSP_CARRIER(6.5), MSP_CARRIER(6.2578125), "6.5/6.25  D/K1 Dual FM-Stereo" },
	{ 0x0005, MSP_CARRIER(6.5), MSP_CARRIER(6.7421875), "6.5/6.74  D/K2 Dual FM-Stereo" },
	{ 0x0006, MSP_CARRIER(6.5), MSP_CARRIER(6.5), "6.5  D/K FM-Mono (HDEV3)" },
	{ 0x0008, MSP_CARRIER(5.5), MSP_CARRIER(5.85), "5.5/5.85  B/G NICAM FM" },
	{ 0x0009, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  L NICAM AM" },
	{ 0x000a, MSP_CARRIER(6.0), MSP_CARRIER(6.55), "6.0/6.55  I NICAM FM" },
	{ 0x000b, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  D/K NICAM FM" },
	{ 0x000c, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  D/K NICAM FM (HDEV2)" },
	{ 0x0020, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M BTSC-Stereo" },
	{ 0x0021, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M BTSC-Mono + SAP" },
	{ 0x0030, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M EIA-J Japan Stereo" },
	{ 0x0040, MSP_CARRIER(10.7), MSP_CARRIER(10.7), "10.7  FM-Stereo Radio" },
	{ 0x0050, MSP_CARRIER(6.5), MSP_CARRIER(6.5), "6.5  SAT-Mono" },
	{ 0x0051, MSP_CARRIER(7.02), MSP_CARRIER(7.20), "7.02/7.20  SAT-Stereo" },
	{ 0x0060, MSP_CARRIER(7.2), MSP_CARRIER(7.2), "7.2  SAT ADR" },
	{     -1, 0, 0, NULL }, /* EOF */
};
 
static int msp3410d_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp3400c *msp = client->data;
	int mode,val,i,std;
    
#ifdef CONFIG_SMP
	lock_kernel();
#endif
    
	daemonize();
	sigfillset(&current->blocked);
	strcpy(current->comm,"msp3410 [auto]");

	msp->thread = current;

#ifdef CONFIG_SMP
	unlock_kernel();
#endif

	printk("msp3410: daemon started\n");
	if(msp->notify != NULL)
		up(msp->notify);
		
	for (;;) {
		if (msp->rmmod)
			goto done;
		if (debug > 1)
			printk("msp3410: thread: sleep\n");
		interruptible_sleep_on(&msp->wq);
		if (debug > 1)
			printk("msp3410: thread: wakeup\n");
		if (msp->rmmod || signal_pending(current))
			goto done;

		if (msp->mode == MSP_MODE_EXTERN)
			continue;
		
		msp->active = 1;

		if (msp->watch_stereo) {
			watch_stereo(client);
			msp->active = 0;
			continue;
		}
	
		/* some time for the tuner to sync */
		current->state   = TASK_INTERRUPTIBLE;
		schedule_timeout(HZ/5);
		if (signal_pending(current))
			goto done;

	restart:
		if (msp->mode == MSP_MODE_EXTERN)
			continue;
		msp->restart = 0;
		del_timer(&msp->wake_stereo);
		msp->watch_stereo = 0;

		/* put into sane state (and mute) */
		msp3400c_reset(client);

		/* start autodetect */
		switch (msp->norm) {
		case VIDEO_MODE_PAL:
			mode = 0x1003;
			std  = 1;
			break;
		case VIDEO_MODE_NTSC:  /* BTSC */
			mode = 0x2003;
			std  = 0x0020;
			break;
		case VIDEO_MODE_SECAM: 
			mode = 0x0003;
			std  = 1;
			break;
		case VIDEO_MODE_RADIO: 
			mode = 0x0003;
			std  = 0x0040;
			break;
		default:
			mode = 0x0003;
			std  = 1;
			break;
		}
		msp3400c_write(client, I2C_MSP3400C_DEM, 0x30, mode);
		msp3400c_write(client, I2C_MSP3400C_DEM, 0x20, std);

		if (debug) {
			int i;
			for (i = 0; modelist[i].name != NULL; i++)
				if (modelist[i].retval == std)
					break;
			printk("msp3410: setting mode: %s (0x%04x)\n",
			       modelist[i].name ? modelist[i].name : "unknown",std);
		}

		if (std != 1) {
			/* programmed some specific mode */
			val = std;
		} else {
			/* triggered autodetect */
			for (;;) {
				current->state   = TASK_INTERRUPTIBLE;
				schedule_timeout(HZ/10);
				if (signal_pending(current))
					goto done;
				if (msp->restart)
					goto restart;

				/* check results */
				val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x7e);
				if (val < 0x07ff)
					break;
				dprintk("msp3410: detection still in progress\n");
			}
		}
		for (i = 0; modelist[i].name != NULL; i++)
			if (modelist[i].retval == val)
				break;
		dprintk("msp3410: current mode: %s (0x%04x)\n",
			modelist[i].name ? modelist[i].name : "unknown",
			val);
		msp->main   = modelist[i].main;
		msp->second = modelist[i].second;

		if (amsound && (msp->norm == VIDEO_MODE_SECAM) && (val != 0x0009)) {
			/* autodetection has failed, let backup */
			dprintk("msp3410: autodetection failed, switching to backup mode: %s (0x%04x)\n",
				modelist[8].name ? modelist[8].name : "unknown",val);
			val = 0x0009;
			msp3400c_write(client, I2C_MSP3400C_DEM, 0x20, val);
		}

		/* set various prescales */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x0d, 0x1900); /* scart */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x0e, 0x2403); /* FM */
		msp3400c_write(client, I2C_MSP3400C_DFP, 0x10, 0x5a00); /* nicam */

		/* set stereo */
		switch (val) {
		case 0x0008: /* B/G NICAM */
		case 0x000a: /* I NICAM */
			if (val == 0x0008)
				msp->mode = MSP_MODE_FM_NICAM1;
			else
				msp->mode = MSP_MODE_FM_NICAM2;
			/* just turn on stereo */
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 1;
			msp->watch_stereo = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
			break;
		case 0x0009:			
			msp->mode = MSP_MODE_AM_NICAM;
			msp->stereo = VIDEO_SOUND_MONO;
			msp->nicam_on = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_MONO);
			msp->watch_stereo = 1;
			break;
		case 0x0020: /* BTSC */
			/* just turn on stereo */
			msp->mode   = MSP_MODE_BTSC;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 0;
			msp->watch_stereo = 1;
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
			break;
		case 0x0040: /* FM radio */
			msp->mode   = MSP_MODE_FM_RADIO;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp->nicam_on = 0;
			msp->watch_stereo = 0;
			/* scart routing */
			msp3400c_set_scart(client,SCART_IN2,0);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x08, 0x0220);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x09, 0x0220);
			msp3400c_write(client,I2C_MSP3400C_DFP, 0x0b, 0x0220);
			break;
		case 0x0003:
			msp->mode   = MSP_MODE_FM_TERRA;
			msp->stereo = VIDEO_SOUND_MONO;
			msp->nicam_on = 0;
			msp->watch_stereo = 1;
			break;
		}
		
		/* unmute + restore dfp registers */
		msp3400c_setbass(client, msp->bass);
		msp3400c_settreble(client, msp->treble);
		msp3400c_setvolume(client, msp->muted, msp->left, msp->right);
		msp3400c_restore_dfp(client);

		if (msp->watch_stereo)
			mod_timer(&msp->wake_stereo, jiffies+HZ);

		msp->active = 0;
	}

done:
	dprintk("msp3410: thread: exit\n");
	msp->active = 0;
	msp->thread = NULL;

	if(msp->notify != NULL)
		up(msp->notify);
	return 0;
}

/* ----------------------------------------------------------------------- */

static int msp_attach(struct i2c_adapter *adap, int addr,
		      unsigned short flags, int kind);
static int msp_detach(struct i2c_client *client);
static int msp_probe(struct i2c_adapter *adap);
static int msp_command(struct i2c_client *client, unsigned int cmd, void *arg);

static struct i2c_driver driver = {
	.name		= "i2cmsp3400driver",
	.id		= I2C_DRIVERID_MSP3400,
	.flags		= I2C_DF_NOTIFY,
	.attach_adapter	= msp_probe,
	.detach_client	= msp_detach,
	.command	= msp_command,
};

static struct i2c_client client_template = 
{
	.name	= "(unset)",
	.flags	= I2C_CLIENT_ALLOW_USE,
	.driver	= &driver,
};

static int msp_attach(struct i2c_adapter *adap, int addr,
		      unsigned short flags, int kind)
{
	DECLARE_MUTEX_LOCKED(sem);
	struct msp3400c *msp;
        struct i2c_client *c;
	int              rev1,rev2,i;

        client_template.adapter = adap;
        client_template.addr = addr;

        if (-1 == msp3400c_reset(&client_template)) {
                dprintk("msp3400: no chip found\n");
                return -1;
        }
	
        if (NULL == (c = kmalloc(sizeof(struct i2c_client),GFP_KERNEL)))
                return -ENOMEM;
        memcpy(c,&client_template,sizeof(struct i2c_client));
	if (NULL == (msp = kmalloc(sizeof(struct msp3400c),GFP_KERNEL))) {
		kfree(c);
		return -ENOMEM;
	}
	
	memset(msp,0,sizeof(struct msp3400c));
	msp->left   = 65535;
	msp->right  = 65535;
	msp->bass   = 32768;
	msp->treble = 32768;
	msp->input  = -1;
	for (i = 0; i < DFP_COUNT; i++)
		msp->dfp_regs[i] = -1;

	c->data = msp;
	init_waitqueue_head(&msp->wq);

	if (-1 == msp3400c_reset(c)) {
		kfree(msp);
		kfree(c);
		dprintk("msp3400: no chip found\n");
		return -1;
	}
    
	rev1 = msp3400c_read(c, I2C_MSP3400C_DFP, 0x1e);
	if (-1 != rev1)
		rev2 = msp3400c_read(c, I2C_MSP3400C_DFP, 0x1f);
	if ((-1 == rev1) || (0 == rev1 && 0 == rev2)) {
		kfree(msp);
		kfree(c);
		printk("msp3400: error while reading chip version\n");
		return -1;
	}

#if 0
	/* this will turn on a 1kHz beep - might be useful for debugging... */
	msp3400c_write(client,I2C_MSP3400C_DFP, 0x0014, 0x1040);
#endif

	sprintf(c->name,"MSP34%02d%c-%c%d",
		(rev2>>8)&0xff, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
	msp->nicam = (((rev2>>8)&0xff) != 00) ? 1 : 0;

	if (simple == -1) {
		/* default mode */
		/* msp->simple = (((rev2>>8)&0xff) == 0) ? 0 : 1; */
		msp->simple = ((rev1&0xff)+'@' > 'C');
	} else {
		/* use insmod option */
		msp->simple = simple;
	}

	/* timer for stereo checking */
	init_timer(&msp->wake_stereo);
	msp->wake_stereo.function = msp3400c_stereo_wake;
	msp->wake_stereo.data     = (unsigned long)msp;

	/* hello world :-) */
	printk(KERN_INFO "msp34xx: init: chip=%s",c->name);
	if (msp->nicam)
		printk(", has NICAM support");
	printk("\n");

	/* startup control thread */
	MOD_INC_USE_COUNT;
	msp->notify = &sem;
	kernel_thread(msp->simple ? msp3410d_thread : msp3400c_thread,
		      (void *)c, 0);
	down(&sem);
	msp->notify = NULL;
	wake_up_interruptible(&msp->wq);

	/* update our own array */
	for (i = 0; i < MSP3400_MAX; i++) {
		if (NULL == msps[i]) {
			msps[i] = c;
			break;
		}
	}
	
	/* done */
        i2c_attach_client(c);
	return 0;
}

static int msp_detach(struct i2c_client *client)
{
	DECLARE_MUTEX_LOCKED(sem);
	struct msp3400c *msp  = (struct msp3400c*)client->data;
	int i;
	
	/* shutdown control thread */
	del_timer(&msp->wake_stereo);
	if (msp->thread) 
	{
		msp->notify = &sem;
		msp->rmmod = 1;
		wake_up_interruptible(&msp->wq);
		down(&sem);
		msp->notify = NULL;
	}
    	msp3400c_reset(client);

        /* update our own array */
	for (i = 0; i < MSP3400_MAX; i++) {
		if (client == msps[i]) {
			msps[i] = NULL;
			break;
		}
	}

	i2c_detach_client(client);
	kfree(msp);
	kfree(client);
	MOD_DEC_USE_COUNT;
	return 0;
}

static int msp_probe(struct i2c_adapter *adap)
{
	if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
		return i2c_probe(adap, &addr_data, msp_attach);
	return 0;
}

static void msp_wake_thread(struct i2c_client *client)
{
	struct msp3400c *msp  = (struct msp3400c*)client->data;

	msp3400c_setvolume(client,msp->muted,0,0);
	msp->watch_stereo=0;
	del_timer(&msp->wake_stereo);
	if (msp->active)
		msp->restart = 1;
	wake_up_interruptible(&msp->wq);
}

static int msp_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct msp3400c *msp  = (struct msp3400c*)client->data;
        __u16           *sarg = arg;
#if 0
	int             *iarg = (int*)arg;
#endif

	switch (cmd) {

	case AUDC_SET_INPUT:
		/* scart switching
		     - IN1 is often used for external input
		     - Hauppauge uses IN2 for the radio */
		dprintk(KERN_DEBUG "msp34xx: AUDC_SET_INPUT(%d)\n",*sarg);
		if (*sarg == msp->input)
			break;
		msp->input = *sarg;
		switch (*sarg) {
		case AUDIO_RADIO:
			msp->mode   = MSP_MODE_FM_RADIO;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp3400c_set_scart(client,SCART_IN2,0);
			msp3400c_write(client,I2C_MSP3400C_DFP,0x000d,0x1900);
			msp3400c_setstereo(client,msp->stereo);
			break;
		case AUDIO_EXTERN:
			msp->mode   = MSP_MODE_EXTERN;
			msp->stereo = VIDEO_SOUND_STEREO;
			msp3400c_set_scart(client,SCART_IN1,0);
			msp3400c_write(client,I2C_MSP3400C_DFP,0x000d,0x1900);
			msp3400c_setstereo(client,msp->stereo);
			break;
		case AUDIO_TUNER:
			msp->mode   = -1;
			msp_wake_thread(client);
			break;
		default:
			if (*sarg & AUDIO_MUTE)
				msp3400c_set_scart(client,SCART_MUTE,0);
			break;
		}
		if (msp->active)
			msp->restart = 1;
		break;

	case AUDC_SET_RADIO:
		dprintk(KERN_DEBUG "msp34xx: AUDC_SET_RADIO\n");
		msp->norm = VIDEO_MODE_RADIO;
		msp->watch_stereo=0;
		del_timer(&msp->wake_stereo);
		dprintk("msp34xx: switching to radio mode\n");
		if (msp->simple) {
			/* the thread will do for us */
			msp_wake_thread(client);
		} else {
			/* set msp3400 to FM radio mode */
			msp3400c_setmode(client,MSP_MODE_FM_RADIO);
			msp3400c_setcarrier(client, MSP_CARRIER(10.7),MSP_CARRIER(10.7));
			msp3400c_setvolume(client,msp->muted,msp->left,msp->right);			
		}
		if (msp->active)
			msp->restart = 1;
		break;

#if 1
	/* work-in-progress:  hook to control the DFP registers */
	case MSP_SET_DFPREG:
	{
		struct msp_dfpreg *r = arg;
		int i;

		if (r->reg < 0 || r->reg >= DFP_COUNT)
			return -EINVAL;
		for (i = 0; i < sizeof(bl_dfp)/sizeof(int); i++)
			if (r->reg == bl_dfp[i])
				return -EINVAL;
		msp->dfp_regs[r->reg] = r->value;
		msp3400c_write(client,I2C_MSP3400C_DFP,r->reg,r->value);
		return 0;
	}
	case MSP_GET_DFPREG:
	{
		struct msp_dfpreg *r = arg;

		if (r->reg < 0 || r->reg >= DFP_COUNT)
			return -EINVAL;
		r->value = msp3400c_read(client,I2C_MSP3400C_DFP,r->reg);
		return 0;
	}
#endif

	/* --- v4l ioctls --- */
	/* take care: bttv does userspace copying, we'll get a
	   kernel pointer here... */
	case VIDIOCGAUDIO:
	{
		struct video_audio *va = arg;

		dprintk(KERN_DEBUG "msp34xx: VIDIOCGAUDIO\n");
		va->flags |= VIDEO_AUDIO_VOLUME |
			VIDEO_AUDIO_BASS |
			VIDEO_AUDIO_TREBLE |
			VIDEO_AUDIO_MUTABLE;
		if (msp->muted)
			va->flags |= VIDEO_AUDIO_MUTE;
		va->volume=MAX(msp->left,msp->right);
		va->balance=(32768*MIN(msp->left,msp->right))/
			(va->volume ? va->volume : 1);
		va->balance=(msp->left<msp->right)?
			(65535-va->balance) : va->balance;
		if (0 == va->volume)
			va->balance = 32768;
		va->bass = msp->bass;
		va->treble = msp->treble;

		if (msp->norm != VIDEO_MODE_RADIO) {
			autodetect_stereo(client);
			va->mode = msp->stereo;
		}
		break;
	}
	case VIDIOCSAUDIO:
	{
		struct video_audio *va = arg;

		dprintk(KERN_DEBUG "msp34xx: VIDIOCSAUDIO\n");
		msp->muted = (va->flags & VIDEO_AUDIO_MUTE);
		msp->left = (MIN(65536 - va->balance,32768) *
			     va->volume) / 32768;
		msp->right = (MIN(va->balance,32768) *
			      va->volume) / 32768;
		msp->bass = va->bass;
		msp->treble = va->treble;
		msp3400c_setvolume(client,msp->muted,msp->left,msp->right);
		msp3400c_setbass(client,msp->bass);
		msp3400c_settreble(client,msp->treble);

		if (va->mode != 0) {
			msp->watch_stereo=0;
			del_timer(&msp->wake_stereo);
			msp->stereo = va->mode;
			msp3400c_setstereo(client,va->mode);
		}
		break;
	}
	case VIDIOCSCHAN:
	{
		struct video_channel *vc = arg;
		
		dprintk(KERN_DEBUG "msp34xx: VIDIOCSCHAN\n");
		dprintk("msp34xx: switching to TV mode\n");
		msp->norm = vc->norm;
		break;
	}
	case VIDIOCSFREQ:
	{
		/* new channel -- kick audio carrier scan */
		dprintk(KERN_DEBUG "msp34xx: VIDIOCSFREQ\n");
		msp_wake_thread(client);
		break;
	}

	default:
		/* nothing */
		break;
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

static int msp3400_init_module(void)
{
	i2c_add_driver(&driver);
	return 0;
}

static void msp3400_cleanup_module(void)
{
	i2c_del_driver(&driver);
}

module_init(msp3400_init_module);
module_exit(msp3400_cleanup_module);

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
