path: root/drivers/char/msp3400.c

/*
 * programming the msp34* sound processor family
 *
 * (c) 1997,1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
 *
 * what works and what doesn't:
 *
 *  AM-Mono
 *      probably doesn't (untested)
 *
 *  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, used in UK, Scandinavia and Spain)
 *      should work, with autodetect. Support for NICAM was added by
 *      Pekka Pietikainen <pp@netppl.fi>
 *
 *
 * TODO:
 *   - better SAT support
 *
 */

#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/malloc.h>
/* #include <asm/smp_lock.h> */

/* kernel_thread */
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>

#include "i2c.h"
#include <linux/videodev.h>

#include "msp3400.h"

int debug = 0; /* insmod parameter */

struct msp3400c 
{
	struct i2c_bus     *bus;

	int nicam;
	int mode;
	int norm;
	int volume;
	int stereo;

	/* thread */
	struct task_struct	*thread;
	struct semaphore	*wait;
	struct semaphore	*notify;
	int active,restart,rmmod;
};

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

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

#define dprintk     if (debug) printk

MODULE_PARM(debug,"i");

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

#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_bus *bus)
{
	int ret = 0;
    
	udelay(2000);
	i2c_start(bus);
	i2c_sendbyte(bus, I2C_MSP3400C,2000);
	i2c_sendbyte(bus, 0x00,0);
	i2c_sendbyte(bus, 0x80,0);
	i2c_sendbyte(bus, 0x00,0);
	i2c_stop(bus);
	udelay(2000);
	i2c_start(bus);
	if (0 != i2c_sendbyte(bus, I2C_MSP3400C,2000) ||
		0 != i2c_sendbyte(bus, 0x00,0) ||
		0 != i2c_sendbyte(bus, 0x00,0) ||
		0 != i2c_sendbyte(bus, 0x00,0)) 
	{
		ret = -1;
		printk(KERN_ERR "msp3400: chip reset failed, penguin on i2c bus?\n");
	}
	i2c_stop(bus);
	udelay(2000);
	return ret;
}

static int msp3400c_read(struct i2c_bus *bus, int dev, int addr)
{
	int ret=0;
	short val = 0;
	i2c_start(bus);
	if (0 != i2c_sendbyte(bus, I2C_MSP3400C,2000) ||
		0 != i2c_sendbyte(bus, dev+1,       0)    ||
		0 != i2c_sendbyte(bus, addr >> 8,   0)    ||
		0 != i2c_sendbyte(bus, addr & 0xff, 0)) 
	{
		ret = -1;
	}
	else
	{
		i2c_start(bus);
		if (0 != i2c_sendbyte(bus, I2C_MSP3400C+1,2000)) 
		{
			ret = -1;
		}
		else
		{
			val |= (int)i2c_readbyte(bus,0) << 8;
			val |= (int)i2c_readbyte(bus,1);
		}
	}
	i2c_stop(bus);
	if (-1 == ret) 
	{
		printk(KERN_WARNING "msp3400: I/O error, trying reset (read %s 0x%x)\n",
			(dev == I2C_MSP3400C_DEM) ? "Demod" : "Audio", addr);
		msp3400c_reset(bus);
	}
	return val;
}

static int msp3400c_write(struct i2c_bus *bus, int dev, int addr, int val)
{
	int ret = 0;
    
	i2c_start(bus);
	if (0 != i2c_sendbyte(bus, I2C_MSP3400C,2000) ||
		0 != i2c_sendbyte(bus, dev,         0)    ||
		0 != i2c_sendbyte(bus, addr >> 8,   0)    ||
		0 != i2c_sendbyte(bus, addr & 0xff, 0)    ||
		0 != i2c_sendbyte(bus, val >> 8,    0)    ||
		0 != i2c_sendbyte(bus, val & 0xff,  0))
	{
		ret = -1;
	}
	i2c_stop(bus);
	if (-1 == ret) 
	{
		printk(KERN_ERR "msp3400: I/O error, trying reset (write %s 0x%x)\n",
			(dev == I2C_MSP3400C_DEM) ? "Demod" : "Audio", addr);
		msp3400c_reset(bus);
	}
	return ret;
}

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

/* 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

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, 0x3002 },

		/* Terrestial FM-mono */
		{ {  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 B/G, D/K */
		{ { -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 I */
		{ {  2, 4, -6, -4, 40, 94 }, {  3, 18, 27, 48, 66, 72 },
		MSP_CARRIER(5.5), MSP_CARRIER(5.5),  0x00d0, 0x0040,   0x0120, 0x3000},
};

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 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(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))

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

static void msp3400c_setcarrier(struct i2c_bus *bus, int cdo1, int cdo2)
{
	msp3400c_write(bus,I2C_MSP3400C_DEM, 0x0093, cdo1 & 0xfff);
	msp3400c_write(bus,I2C_MSP3400C_DEM, 0x009b, cdo1 >> 12);
	msp3400c_write(bus,I2C_MSP3400C_DEM, 0x00a3, cdo2 & 0xfff);
	msp3400c_write(bus,I2C_MSP3400C_DEM, 0x00ab, cdo2 >> 12);
}

static void msp3400c_setvolume(struct i2c_bus *bus, int vol)
{
	int val = (vol * 0x73 / 65535) << 8;

	dprintk("msp3400: setvolume: 0x%02x\n",val>>8);
	msp3400c_write(bus,I2C_MSP3400C_DFP, 0x0000, val); /* loudspeaker */
	msp3400c_write(bus,I2C_MSP3400C_DFP, 0x0006, val); /* headphones  */
	/* scart - on/off only */
	msp3400c_write(bus,I2C_MSP3400C_DFP, 0x0007, val ? 0x4000 : 0);
}

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

	msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x00bb,          /* ad_cv */
		msp_init_data[type].ad_cv);
    
	for (i = 5; i >= 0; i--)                                   /* fir 1 */
		msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0001,
			msp_init_data[type].fir1[i]);
    
	msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0005, 0x0004); /* fir 2 */
	msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0005, 0x0040);
	msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0005, 0x0000);
	for (i = 5; i >= 0; i--)
		msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0005,
			msp_init_data[type].fir2[i]);
    
	msp3400c_write(msp->bus,I2C_MSP3400C_DEM, 0x0083,          /* MODE_REG */
		msp_init_data[type].mode_reg);
    
	msp3400c_setcarrier(msp->bus, msp_init_data[type].cdo1,
		msp_init_data[type].cdo2);
    
	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0008,
		msp_init_data[type].dfp_src);
	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0009,
		msp_init_data[type].dfp_src);
	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000a,
		msp_init_data[type].dfp_src);
	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000e,
		msp_init_data[type].dfp_matrix);

	if (msp->nicam) 
	{
		/* msp3410 needs some more initialization */
        	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0010, 0x3000);
	}
}

static void msp3400c_setstereo(struct msp3400c *msp, int mode)
{
	int nicam=0; /* channel source: FM/AM or nicam */

	/* switch demodulator */
	switch (msp->mode) 
	{
		case MSP_MODE_FM_TERRA:
			dprintk("msp3400: B/G setstereo: %d\n",mode);
			msp->stereo = mode;
			msp3400c_setcarrier(msp->bus,MSP_CARRIER(5.7421875),MSP_CARRIER(5.5));
			switch (mode) 
			{
				case VIDEO_SOUND_STEREO:
					msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000e, 0x3001);
					break;
				case VIDEO_SOUND_MONO:
				case VIDEO_SOUND_LANG1:
				case VIDEO_SOUND_LANG2:
					msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000e, 0x3000);
					break;
			}
			break;
		case MSP_MODE_FM_SAT:
			dprintk("msp3400: sat setstereo: %d\n",mode);
			msp->stereo = mode;
			switch (mode) 
			{
				case VIDEO_SOUND_MONO:
					msp3400c_setcarrier(msp->bus, MSP_CARRIER(6.5), MSP_CARRIER(6.5));
					break;
				case VIDEO_SOUND_STEREO:
					msp3400c_setcarrier(msp->bus, MSP_CARRIER(7.2), MSP_CARRIER(7.02));
					break;
				case VIDEO_SOUND_LANG1:
					msp3400c_setcarrier(msp->bus, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
					break;
				case VIDEO_SOUND_LANG2:
					msp3400c_setcarrier(msp->bus, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
					break;
			}
			break;
		case MSP_MODE_FM_NICAM1:
			dprintk("msp3400: NICAM1 setstereo: %d\n",mode);
			msp->stereo = mode;
			msp3400c_setcarrier(msp->bus,MSP_CARRIER(5.85),MSP_CARRIER(5.5));
			nicam=0x0100;
			break;
		default:
			/* can't do stereo - abort here */
			return;
	}

	/* switch audio */
	switch (mode) 
	{
		case VIDEO_SOUND_STEREO:
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0008, 0x0020|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0009, 0x0020|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000a, 0x0020|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0005, 0x4000);
			break;
		case VIDEO_SOUND_MONO:
		case VIDEO_SOUND_LANG1:
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0008, 0x0000|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0009, 0x0000|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000a, 0x0000|nicam);
			break;
		case VIDEO_SOUND_LANG2:
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0008, 0x0010|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0009, 0x0010|nicam);
			msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x000a, 0x0010|nicam);
			break;
	}
}

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

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" },
};

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

int msp3400c_thread(void *data)
{
	unsigned long flags;
	struct msp3400c *msp = data;
	struct semaphore sem = MUTEX_LOCKED;
    
	struct CARRIER_DETECT *cd;
	int count, max1,max2,val1,val2, val,this, check_stereo;
	int i;
    
	/* lock_kernel(); */
    
	exit_mm(current);
	current->session = 1;
	current->pgrp = 1;
	sigfillset(&current->blocked);
	current->fs->umask = 0;
	strcpy(current->comm,"msp3400");

	msp->wait   = &sem;
	msp->thread = current;

	/* unlock_kernel(); */

	dprintk("msp3400: thread: start\n");
	if(msp->notify != NULL)
		up(msp->notify);
		
	for (;;) 
	{
		if (msp->rmmod)
			goto done;
		dprintk("msp3400: thread: sleep\n");
		down_interruptible(&sem);
		dprintk("msp3400: thread: wakeup\n");
		if (msp->rmmod)
			goto done;
#if 0
		if (VIDEO_MODE_RADIO == msp->norm) 
		{
			msp->active = 1;
			current->state = TASK_INTERRUPTIBLE;
			current->timeout = jiffies + HZ/10;
			schedule();
			if (signal_pending(current))
				goto done;
			LOCK_I2C_BUS(msp->bus);
			val1 = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1b);
			val2 = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1c);
			UNLOCK_I2C_BUS(msp->bus);
			printk("msp3400: DC %d/%d\n",val1,val2);
			msp->active = 0;
			continue;
		}
#endif
	
		if (VIDEO_MODE_RADIO == msp->norm)
			continue;  /* nothing to do */
	
		msp->active = 1;
restart:
		LOCK_I2C_BUS(msp->bus);
		msp3400c_setvolume(msp->bus, 0);
		msp3400c_setmode(msp, MSP_MODE_AM_DETECT);
		val1 = val2 = max1 = max2 = check_stereo = 0;

		/* carrier detect pass #1 -- main carrier */
		cd = carrier_detect_main; count = CARRIER_COUNT(carrier_detect_main);
		for (this = 0; this < count; this++) 
		{
			msp3400c_setcarrier(msp->bus, cd[this].cdo,cd[this].cdo);
			UNLOCK_I2C_BUS(msp->bus);
			current->state = TASK_INTERRUPTIBLE;
			current->timeout = jiffies + HZ/25;
			schedule();
			if (signal_pending(current))
				goto done;
			if (msp->restart) 
			{
				msp->restart = 0;
				goto restart;
			}

			LOCK_I2C_BUS(msp->bus);
			val = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1b);
			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;
		}
		for (this = 0; this < count; this++) 
		{
			msp3400c_setcarrier(msp->bus, cd[this].cdo,cd[this].cdo);
			UNLOCK_I2C_BUS(msp->bus);

			current->state = TASK_INTERRUPTIBLE;
			current->timeout = jiffies + HZ/25;
			schedule();
			if (signal_pending(current))
				goto done;
			if (msp->restart) 
			{
				msp->restart = 0;
				goto restart;
			}

			LOCK_I2C_BUS(msp->bus);
			val = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1b);
			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 */
		switch (max1) 
		{
			case 0: /* 4.5 */
			case 1: /* 5.5 */
				msp3400c_setmode(msp, MSP_MODE_FM_TERRA);
				msp3400c_setcarrier(msp->bus, carrier_detect_main[max1].cdo,
				carrier_detect_main[max1].cdo);
				if (max2 == 0) 
				{
					/* B/G FM-stereo */
					msp3400c_setstereo(msp, VIDEO_SOUND_MONO);
					check_stereo = 1;
				}
				if (max2 == 1 && msp->nicam) 
				{
					/* B/G NICAM */
					msp3400c_setmode(msp, MSP_MODE_FM_NICAM1);
					/* msp3400c_write(msp->bus, I2C_MSP3400C_DFP, 0x21, 0x01); */
					msp3400c_setcarrier(msp->bus, MSP_CARRIER(5.85),
						MSP_CARRIER(5.5));
					check_stereo = 1;
				}
				break;
			case 2: /* 6.0 */
			case 3: /* 6.5 */
			default:
				msp3400c_setmode(msp, MSP_MODE_FM_TERRA);
				msp3400c_setcarrier(msp->bus, carrier_detect_main[max1].cdo,
					carrier_detect_main[max1].cdo);
				msp3400c_setstereo(msp, VIDEO_SOUND_STEREO);
				break;
		}
	
		/* unmute */
		msp3400c_setvolume(msp->bus, msp->volume);

		if (check_stereo) 
		{
			/* stereo available -- check current mode */
			UNLOCK_I2C_BUS(msp->bus);
		   
			current->state = TASK_INTERRUPTIBLE;
			current->timeout = jiffies + HZ;
			schedule();
			if (signal_pending(current))
				goto done;
			if (msp->restart) 
			{
				msp->restart = 0;
				goto restart;
			}
		    
			LOCK_I2C_BUS(msp->bus);
			switch (msp->mode) 
			{
				case MSP_MODE_FM_TERRA:
					val = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x18);
					dprintk("msp3400: stereo detect register: %d\n",val);
			
					if (val > 4096) 
					{
						msp3400c_setstereo(msp, VIDEO_SOUND_STEREO);
					}
					else if (val < -4096) 
					{
						msp3400c_setstereo(msp, VIDEO_SOUND_LANG1);
					}
					else
					{
						msp3400c_setstereo(msp, VIDEO_SOUND_MONO);
					}
					break;
				case MSP_MODE_FM_NICAM1:
  					val = msp3400c_read(msp->bus, I2C_MSP3400C_DEM, 0x23);
 					switch ((val & 0x1e) >> 1)  
 					{
						case 0:
						case 8:
							msp3400c_setstereo(msp, VIDEO_SOUND_STEREO);
							break;
						default:
							msp3400c_setstereo(msp, VIDEO_SOUND_MONO);
							break;
 					}			

					/* dump registers (for debugging) */
					if (debug)
					{
						for (i=0; i<sizeof(d1)/sizeof(struct REGISTER_DUMP); i++) 
						{
							val = msp3400c_read(msp->bus,I2C_MSP3400C_DEM, d1[i].addr);
							printk(KERN_DEBUG "msp3400: %s = 0x%x\n",
		       						d1[i].name,val);
						}
					}
					break;
			}
		}
		UNLOCK_I2C_BUS(msp->bus);
		msp->active = 0;
	}

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

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

int msp3410d_thread(void *data)
{
	unsigned long flags;
	struct msp3400c *msp = data;
	struct semaphore sem = MUTEX_LOCKED;
	int i, val;

	/* lock_kernel(); */
    
	exit_mm(current);
	current->session = 1;
	current->pgrp = 1;
	sigfillset(&current->blocked);
	current->fs->umask = 0;
	strcpy(current->comm,"msp3410 (nicam)");

	msp->wait   = &sem;
	msp->thread = current;

	/* unlock_kernel(); */

	dprintk("msp3410: thread: start\n");
	if(msp->notify != NULL)
		up(msp->notify);
		
	for (;;) 
	{
		if (msp->rmmod)
			goto done;
		dprintk("msp3410: thread: sleep\n");
		down_interruptible(&sem);
		dprintk("msp3410: thread: wakeup\n");
		if (msp->rmmod)
			goto done;
	
		if (VIDEO_MODE_RADIO == msp->norm)
			continue;  /* nothing to do */
	
		msp->active = 1;

restart:
		LOCK_I2C_BUS(msp->bus);
		/* mute */
		msp3400c_setvolume(msp->bus, 0);
		/* quick & dirty hack:
		   get the audio proccessor into some useful state */
		msp3400c_setmode(msp, MSP_MODE_FM_NICAM1);
		/* kick autodetect */
		msp3400c_write(msp->bus, I2C_MSP3400C_DFP, 0x20, 0x01);
		msp3400c_write(msp->bus, I2C_MSP3400C_DFP, 0x21, 0x01);
		UNLOCK_I2C_BUS(msp->bus);

		/* wait 1 sec */
		current->state = TASK_INTERRUPTIBLE;
		current->timeout = jiffies + HZ;
		schedule();
		if (signal_pending(current))
			goto done;
		if (msp->restart) 
		{
			msp->restart = 0;
			goto restart;
		}
	
		LOCK_I2C_BUS(msp->bus);
		/* debug register dump */
		for (i = 0; i < sizeof(d1)/sizeof(struct REGISTER_DUMP); i++) 
		{
			val = msp3400c_read(msp->bus,I2C_MSP3400C_DEM,d1[i].addr);
			printk(KERN_DEBUG "msp3400: %s = 0x%x\n",d1[i].name,val);
		}	
		/* unmute */
		msp3400c_setvolume(msp->bus, msp->volume);
		UNLOCK_I2C_BUS(msp->bus);

		msp->active = 0;
	}

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

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

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

static int msp3400c_attach(struct i2c_device *device)
{
	unsigned long flags;
	struct semaphore sem = MUTEX_LOCKED;
	struct msp3400c *msp;
	int rev1,rev2;
	
	/*
	 *	MSP3400's are for now only assumed to live on busses
	 *	connected to a BT848. Adjust as and when you get new
	 *	funky cards using these components.
	 */
	
	if(device->bus->id != I2C_BUSID_BT848)
		return -EINVAL;

	device->data = msp = kmalloc(sizeof(struct msp3400c),GFP_KERNEL);
	if (NULL == msp)
		return -ENOMEM;
	memset(msp,0,sizeof(struct msp3400c));
	msp->bus = device->bus;
	msp->volume = 65535;

	LOCK_I2C_BUS(msp->bus);
	if (-1 == msp3400c_reset(msp->bus)) 
	{
		UNLOCK_I2C_BUS(msp->bus);
		kfree(msp);
		return -1;
	}
    
	msp3400c_setmode(msp, MSP_MODE_FM_TERRA);
	msp3400c_setvolume(msp->bus, msp->volume);

	rev1 = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1e);
	rev2 = msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1f);

#if 0
	/* this will turn on a 1kHz beep - might be useful for debugging... */
	msp3400c_write(msp->bus,I2C_MSP3400C_DFP, 0x0014, 0x1040);
#endif
	UNLOCK_I2C_BUS(msp->bus);

	sprintf(device->name,"MSP34%02d%c-%c%d",
		(rev2>>8)&0xff, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
	msp->nicam = (((rev2>>8)&0xff) == 10) ? 1 : 0;
	printk(KERN_INFO "msp3400: init: chip=%s%s\n",
		device->name, msp->nicam ? ", can decode nicam" : "");

	MOD_INC_USE_COUNT;
	/* startup control thread */
	msp->notify = &sem;
	kernel_thread(msp3400c_thread, (void *)msp, 0);
	down(&sem);
	msp->notify = NULL;
	if (!msp->active)
		up(msp->wait);
	return 0;
}

static int msp3400c_detach(struct i2c_device *device)
{
	unsigned long flags;
	struct semaphore sem = MUTEX_LOCKED;
	struct msp3400c *msp  = (struct msp3400c*)device->data;
    
	/* shutdown control thread */
	msp->notify = &sem;
	msp->rmmod = 1;
	if (!msp->active)
		up(msp->wait);
	down(&sem);
	msp->notify = NULL;
   
	LOCK_I2C_BUS(msp->bus);
	msp3400c_reset(msp->bus);
	UNLOCK_I2C_BUS(msp->bus);

	kfree(msp);
	MOD_DEC_USE_COUNT;
	return 0;
}

static int msp3400c_command(struct i2c_device *device,
		 unsigned int cmd, void *arg)
{
	unsigned long flags;
	struct msp3400c *msp = (struct msp3400c*)device->data;
	int *iarg = (int*)arg;

	switch (cmd) 
	{
		case MSP_SET_RADIO:
			msp->norm = VIDEO_MODE_RADIO;
			LOCK_I2C_BUS(msp->bus);
			msp3400c_setmode(msp,MSP_MODE_FM_RADIO);
			msp3400c_setcarrier(msp->bus, MSP_CARRIER(10.7),MSP_CARRIER(10.7));
			UNLOCK_I2C_BUS(msp->bus);
			break;
		case MSP_SET_TVNORM:
			msp->norm = *iarg;
			break;
		case MSP_NEWCHANNEL:
			if (!msp->active)
				up(msp->wait);
			else
				msp->restart = 1;
			break;

		case MSP_GET_VOLUME:
			*iarg = msp->volume;
			break;
		case MSP_SET_VOLUME:
			msp->volume = *iarg;
			LOCK_I2C_BUS(msp->bus);
			msp3400c_setvolume(msp->bus,msp->volume);
			UNLOCK_I2C_BUS(msp->bus);
			break;

		case MSP_GET_STEREO:
			*iarg = msp->stereo;
			break;
		case MSP_SET_STEREO:
			if (*iarg) 
			{
				LOCK_I2C_BUS(msp->bus);
				msp3400c_setstereo(msp,*iarg);
				UNLOCK_I2C_BUS(msp->bus);
			}
			break;

		case MSP_GET_DC:
			LOCK_I2C_BUS(msp->bus);
			*iarg = (int)msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1b) +
				(int)msp3400c_read(msp->bus, I2C_MSP3400C_DFP, 0x1c);
			UNLOCK_I2C_BUS(msp->bus);
			break;
	
		default:
			return -EINVAL;
	}
	return 0;
}

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

struct i2c_driver i2c_driver_msp = 
{
	"msp3400",                    /* name       */
	I2C_DRIVERID_MSP3400,         /* ID         */
	I2C_MSP3400C, I2C_MSP3400C,   /* addr range */

	msp3400c_attach,
	msp3400c_detach,
	msp3400c_command
};

#ifdef MODULE
int init_module(void)
#else
int msp3400c_init(void)
#endif
{
	i2c_register_driver(&i2c_driver_msp);
	return 0;
}

#ifdef MODULE
void cleanup_module(void)
{
	i2c_unregister_driver(&i2c_driver_msp);
}
#endif