#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/poll.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include <linux/init.h>

#include <media/tuner.h>
#include <media/audiochip.h>

/* Addresses to scan */
static unsigned short normal_i2c[] = {I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {0x60,0x6f,I2C_CLIENT_END};
I2C_CLIENT_INSMOD;

#define UNSET (-1U)

/* insmod options */
static unsigned int debug =  0;
static unsigned int type  =  UNSET;
static unsigned int addr  =  0;
static char *pal =  "b";
static unsigned int tv_range[2]    = { 44, 958 };
static unsigned int radio_range[2] = { 65, 108 };
MODULE_PARM(debug,"i");
MODULE_PARM(type,"i");
MODULE_PARM(addr,"i");
MODULE_PARM(tv_range,"2i");
MODULE_PARM(radio_range,"2i");
MODULE_PARM(pal,"s");

#define optimize_vco 1

MODULE_DESCRIPTION("device driver for various TV and TV+FM radio tuners");
MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
MODULE_LICENSE("GPL");

static int this_adap;
#define dprintk     if (debug) printk

struct tuner {
	unsigned int type;            /* chip type */
	unsigned int freq;            /* keep track of the current settings */
	unsigned int std;
	
	unsigned int radio;
	unsigned int mode;            /* current norm for multi-norm tuners */
	unsigned int input;
	
	// only for MT2032
	unsigned int xogc;
	unsigned int radio_if2;

	void (*tv_freq)(struct i2c_client *c, unsigned int freq);
	void (*radio_freq)(struct i2c_client *c, unsigned int freq);
};

static struct i2c_driver driver;
static struct i2c_client client_template;

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

/* tv standard selection for Temic 4046 FM5
   this value takes the low bits of control byte 2
   from datasheet Rev.01, Feb.00 
     standard     BG      I       L       L2      D
     picture IF   38.9    38.9    38.9    33.95   38.9
     sound 1      33.4    32.9    32.4    40.45   32.4
     sound 2      33.16   
     NICAM        33.05   32.348  33.05           33.05
 */
#define TEMIC_SET_PAL_I         0x05
#define TEMIC_SET_PAL_DK        0x09
#define TEMIC_SET_PAL_L         0x0a // SECAM ?
#define TEMIC_SET_PAL_L2        0x0b // change IF !
#define TEMIC_SET_PAL_BG        0x0c

/* tv tuner system standard selection for Philips FQ1216ME
   this value takes the low bits of control byte 2
   from datasheet "1999 Nov 16" (supersedes "1999 Mar 23")
     standard 		BG	DK	I	L	L`
     picture carrier	38.90	38.90	38.90	38.90	33.95
     colour		34.47	34.47	34.47	34.47	38.38
     sound 1		33.40	32.40	32.90	32.40	40.45
     sound 2		33.16	-	-	-	-
     NICAM		33.05	33.05	32.35	33.05	39.80
 */
#define PHILIPS_SET_PAL_I	0x01 /* Bit 2 always zero !*/
#define PHILIPS_SET_PAL_BGDK	0x09
#define PHILIPS_SET_PAL_L2	0x0a
#define PHILIPS_SET_PAL_L	0x0b	

/* system switching for Philips FI1216MF MK2
   from datasheet "1996 Jul 09",
    standard         BG     L      L'
    picture carrier  38.90  38.90  33.95
    colour	     34.47  34.37  38.38
    sound 1          33.40  32.40  40.45
    sound 2          33.16  -      -
    NICAM            33.05  33.05  39.80
 */
#define PHILIPS_MF_SET_BG	0x01 /* Bit 2 must be zero, Bit 3 is system output */
#define PHILIPS_MF_SET_PAL_L	0x03 // France
#define PHILIPS_MF_SET_PAL_L2	0x02 // L'


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

struct tunertype 
{
	char *name;
	unsigned char Vendor;
	unsigned char Type;
  
	unsigned short thresh1;  /*  band switch VHF_LO <=> VHF_HI  */
	unsigned short thresh2;  /*  band switch VHF_HI <=> UHF     */
	unsigned char VHF_L;
	unsigned char VHF_H;
	unsigned char UHF;
	unsigned char config; 
	unsigned short IFPCoff; /* 622.4=16*38.90 MHz PAL, 
				   732  =16*45.75 NTSCi, 
				   940  =58.75 NTSC-Japan */
};

/*
 *	The floats in the tuner struct are computed at compile time
 *	by gcc and cast back to integers. Thus we don't violate the
 *	"no float in kernel" rule.
 */
static struct tunertype tuners[] = {
        { "Temic PAL (4002 FH5)", TEMIC, PAL,
	  16*140.25,16*463.25,0x02,0x04,0x01,0x8e,623},
	{ "Philips PAL_I (FI1246 and compatibles)", Philips, PAL_I,
	  16*140.25,16*463.25,0xa0,0x90,0x30,0x8e,623},
	{ "Philips NTSC (FI1236,FM1236 and compatibles)", Philips, NTSC,
	  16*157.25,16*451.25,0xA0,0x90,0x30,0x8e,732},
	{ "Philips (SECAM+PAL_BG) (FI1216MF, FM1216MF, FR1216MF)", Philips, SECAM,
	  16*168.25,16*447.25,0xA7,0x97,0x37,0x8e,623},

	{ "NoTuner", NoTuner, NOTUNER,
	  0,0,0x00,0x00,0x00,0x00,0x00},
	{ "Philips PAL_BG (FI1216 and compatibles)", Philips, PAL,
	  16*168.25,16*447.25,0xA0,0x90,0x30,0x8e,623},
	{ "Temic NTSC (4032 FY5)", TEMIC, NTSC,
	  16*157.25,16*463.25,0x02,0x04,0x01,0x8e,732},
	{ "Temic PAL_I (4062 FY5)", TEMIC, PAL_I,
	  16*170.00,16*450.00,0x02,0x04,0x01,0x8e,623},

 	{ "Temic NTSC (4036 FY5)", TEMIC, NTSC,
	  16*157.25,16*463.25,0xa0,0x90,0x30,0x8e,732},
        { "Alps HSBH1", TEMIC, NTSC,
	  16*137.25,16*385.25,0x01,0x02,0x08,0x8e,732},
        { "Alps TSBE1",TEMIC,PAL,
	  16*137.25,16*385.25,0x01,0x02,0x08,0x8e,732},
        { "Alps TSBB5", Alps, PAL_I, /* tested (UK UHF) with Modulartech MM205 */
	  16*133.25,16*351.25,0x01,0x02,0x08,0x8e,632},

        { "Alps TSBE5", Alps, PAL, /* untested - data sheet guess. Only IF differs. */
	  16*133.25,16*351.25,0x01,0x02,0x08,0x8e,622},
        { "Alps TSBC5", Alps, PAL, /* untested - data sheet guess. Only IF differs. */
	  16*133.25,16*351.25,0x01,0x02,0x08,0x8e,608},
	{ "Temic PAL_BG (4006FH5)", TEMIC, PAL,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623}, 
  	{ "Alps TSCH6",Alps,NTSC,
  	  16*137.25,16*385.25,0x14,0x12,0x11,0x8e,732},

  	{ "Temic PAL_DK (4016 FY5)",TEMIC,PAL,
  	  16*168.25,16*456.25,0xa0,0x90,0x30,0x8e,623},
  	{ "Philips NTSC_M (MK2)",Philips,NTSC,
  	  16*160.00,16*454.00,0xa0,0x90,0x30,0x8e,732},
        { "Temic PAL_I (4066 FY5)", TEMIC, PAL_I,
          16*169.00, 16*454.00, 0xa0,0x90,0x30,0x8e,623},
        { "Temic PAL* auto (4006 FN5)", TEMIC, PAL,
          16*169.00, 16*454.00, 0xa0,0x90,0x30,0x8e,623},

        { "Temic PAL_BG (4009 FR5) or PAL_I (4069 FR5)", TEMIC, PAL,
          16*141.00, 16*464.00, 0xa0,0x90,0x30,0x8e,623},
        { "Temic NTSC (4039 FR5)", TEMIC, NTSC,
          16*158.00, 16*453.00, 0xa0,0x90,0x30,0x8e,732},
        { "Temic PAL/SECAM multi (4046 FM5)", TEMIC, PAL,
          16*169.00, 16*454.00, 0xa0,0x90,0x30,0x8e,623},
        { "Philips PAL_DK (FI1256 and compatibles)", Philips, PAL,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},

	{ "Philips PAL/SECAM multi (FQ1216ME)", Philips, PAL,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},
	{ "LG PAL_I+FM (TAPC-I001D)", LGINNOTEK, PAL_I,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},
	{ "LG PAL_I (TAPC-I701D)", LGINNOTEK, PAL_I,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},
	{ "LG NTSC+FM (TPI8NSR01F)", LGINNOTEK, NTSC,
	  16*210.00,16*497.00,0xa0,0x90,0x30,0x8e,732},

	{ "LG PAL_BG+FM (TPI8PSB01D)", LGINNOTEK, PAL,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},
	{ "LG PAL_BG (TPI8PSB11D)", LGINNOTEK, PAL,
	  16*170.00,16*450.00,0xa0,0x90,0x30,0x8e,623},
	{ "Temic PAL* auto + FM (4009 FN5)", TEMIC, PAL,
	  16*141.00, 16*464.00, 0xa0,0x90,0x30,0x8e,623},
	{ "SHARP NTSC_JP (2U5JF5540)", SHARP, NTSC, /* 940=16*58.75 NTSC@Japan */
	  16*137.25,16*317.25,0x01,0x02,0x08,0x8e,732 }, // Corrected to NTSC=732 (was:940)

	{ "Samsung PAL TCPM9091PD27", Samsung, PAL,  /* from sourceforge v3tv */
          16*169,16*464,0xA0,0x90,0x30,0x8e,623},
	{ "MT20xx universal", Microtune,PAL|NTSC,
               0,0,0,0,0,0,0},
	{ "Temic PAL_BG (4106 FH5)", TEMIC, PAL,
          16*141.00, 16*464.00, 0xa0,0x90,0x30,0x8e,623},
	{ "Temic PAL_DK/SECAM_L (4012 FY5)", TEMIC, PAL,
          16*140.25, 16*463.25, 0x02,0x04,0x01,0x8e,623},

	{ "Temic NTSC (4136 FY5)", TEMIC, NTSC,
          16*158.00, 16*453.00, 0xa0,0x90,0x30,0x8e,732},
        { "LG PAL (newer TAPC series)", LGINNOTEK, PAL,
          16*170.00, 16*450.00, 0x01,0x02,0x08,0x8e,623},
	{ "Philips PAL/SECAM multi (FM1216ME MK3)", Philips, PAL,
	  16*160.00,16*442.00,0x01,0x02,0x04,0x8e,623 },
	{ "LG NTSC (newer TAPC series)", LGINNOTEK, NTSC,
          16*170.00, 16*450.00, 0x01,0x02,0x08,0x8e,732},

	{ "HITACHI V7-J180AT", HITACHI, NTSC,
	  16*170.00, 16*450.00, 0x01,0x02,0x00,0x8e,940 },
	{ "Philips PAL_MK (FI1216 MK)", Philips, PAL,
	  16*140.25,16*463.25,0x01,0xc2,0xcf,0x8e,623},
	{ "Philips 1236D ATSC/NTSC daul in",Philips,ATSC,
	  16*157.25,16*454.00,0xa0,0x90,0x30,0x8e,732},
        { "Philips NTSC MK3 (FM1236MK3 or FM1236/F)", Philips, NTSC,
          16*160.00,16*442.00,0x01,0x02,0x04,0x8,732},
};
#define TUNERS ARRAY_SIZE(tuners)

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

static int tuner_getstatus(struct i2c_client *c)
{
	unsigned char byte;

	struct tuner *t = i2c_get_clientdata(c);

        if (t->type == TUNER_MT2032)
		return 0;

	if (1 != i2c_master_recv(c,&byte,1))
		return 0;
	return byte;
}

#define TUNER_POR       0x80
#define TUNER_FL        0x40
#define TUNER_MODE      0x38
#define TUNER_AFC       0x07

#define TUNER_STEREO    0x10 /* radio mode */
#define TUNER_SIGNAL    0x07 /* radio mode */

static int tuner_signal(struct i2c_client *c)
{
	return (tuner_getstatus(c) & TUNER_SIGNAL)<<13;
}

static int tuner_stereo(struct i2c_client *c)
{
	return (tuner_getstatus (c) & TUNER_STEREO);
}

#if 0 /* unused */
static int tuner_islocked (struct i2c_client *c)
{
        return (tuner_getstatus (c) & TUNER_FL);
}

static int tuner_afcstatus (struct i2c_client *c)
{
        return (tuner_getstatus (c) & TUNER_AFC) - 2;
}

static int tuner_mode (struct i2c_client *c)
{
        return (tuner_getstatus (c) & TUNER_MODE) >> 3;
}
#endif

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

#define MT2032 0x04
#define MT2030 0x06
#define MT2040 0x07
#define MT2050 0x42

static char *microtune_part[] = {
	[ MT2030 ] = "MT2030",
	[ MT2032 ] = "MT2032",
	[ MT2040 ] = "MT2040",
	[ MT2050 ] = "MT2050",
};

// IsSpurInBand()?
static int mt2032_spurcheck(int f1, int f2, int spectrum_from,int spectrum_to)
{
	int n1=1,n2,f;

	f1=f1/1000; //scale to kHz to avoid 32bit overflows
	f2=f2/1000;
	spectrum_from/=1000;
	spectrum_to/=1000;

	dprintk("spurcheck f1=%d f2=%d  from=%d to=%d\n",f1,f2,spectrum_from,spectrum_to);

	do {
	    n2=-n1;
	    f=n1*(f1-f2);
	    do {
		n2--;
		f=f-f2;
		dprintk(" spurtest n1=%d n2=%d ftest=%d\n",n1,n2,f);

		if( (f>spectrum_from) && (f<spectrum_to))
			printk("mt2032 spurcheck triggered: %d\n",n1);
	    } while ( (f>(f2-spectrum_to)) || (n2>-5));
	    n1++;
	} while (n1<5);

	return 1;
}

static int mt2032_compute_freq(unsigned int rfin,
			       unsigned int if1, unsigned int if2,
			       unsigned int spectrum_from,
			       unsigned int spectrum_to,
			       unsigned char *buf,
			       int *ret_sel,
			       unsigned int xogc) //all in Hz
{
        unsigned int fref,lo1,lo1n,lo1a,s,sel,lo1freq, desired_lo1,
		desired_lo2,lo2,lo2n,lo2a,lo2num,lo2freq;

        fref= 5250 *1000; //5.25MHz
	desired_lo1=rfin+if1;

	lo1=(2*(desired_lo1/1000)+(fref/1000)) / (2*fref/1000);
        lo1n=lo1/8;
        lo1a=lo1-(lo1n*8);

        s=rfin/1000/1000+1090;

	if(optimize_vco) {
		if(s>1890) sel=0;
		else if(s>1720) sel=1;
		else if(s>1530) sel=2;
		else if(s>1370) sel=3;
		else sel=4; // >1090
	}
	else {
        	if(s>1790) sel=0; // <1958
        	else if(s>1617) sel=1;
        	else if(s>1449) sel=2;
        	else if(s>1291) sel=3;
        	else sel=4; // >1090
	}
	*ret_sel=sel;

        lo1freq=(lo1a+8*lo1n)*fref;

        dprintk("mt2032: rfin=%d lo1=%d lo1n=%d lo1a=%d sel=%d, lo1freq=%d\n",
		rfin,lo1,lo1n,lo1a,sel,lo1freq);

        desired_lo2=lo1freq-rfin-if2;
        lo2=(desired_lo2)/fref;
        lo2n=lo2/8;
        lo2a=lo2-(lo2n*8);
        lo2num=((desired_lo2/1000)%(fref/1000))* 3780/(fref/1000); //scale to fit in 32bit arith
        lo2freq=(lo2a+8*lo2n)*fref + lo2num*(fref/1000)/3780*1000;

        dprintk("mt2032: rfin=%d lo2=%d lo2n=%d lo2a=%d num=%d lo2freq=%d\n",
		rfin,lo2,lo2n,lo2a,lo2num,lo2freq);

        if(lo1a<0 || lo1a>7 || lo1n<17 ||lo1n>48 || lo2a<0 ||lo2a >7 ||lo2n<17 || lo2n>30) {
                printk("mt2032: frequency parameters out of range: %d %d %d %d\n",
		       lo1a, lo1n, lo2a,lo2n);
                return(-1);
        }

	mt2032_spurcheck(lo1freq, desired_lo2,  spectrum_from, spectrum_to);
	// should recalculate lo1 (one step up/down)

	// set up MT2032 register map for transfer over i2c
	buf[0]=lo1n-1;
	buf[1]=lo1a | (sel<<4);
	buf[2]=0x86; // LOGC
	buf[3]=0x0f; //reserved
	buf[4]=0x1f;
	buf[5]=(lo2n-1) | (lo2a<<5);
 	if(rfin >400*1000*1000)
                buf[6]=0xe4;
        else
                buf[6]=0xf4; // set PKEN per rev 1.2 
	buf[7]=8+xogc;
	buf[8]=0xc3; //reserved
	buf[9]=0x4e; //reserved
	buf[10]=0xec; //reserved
	buf[11]=(lo2num&0xff);
	buf[12]=(lo2num>>8) |0x80; // Lo2RST

	return 0;
}

static int mt2032_check_lo_lock(struct i2c_client *c)
{
	int try,lock=0;
	unsigned char buf[2];
	for(try=0;try<10;try++) {
		buf[0]=0x0e;
		i2c_master_send(c,buf,1);
		i2c_master_recv(c,buf,1);
		dprintk("mt2032 Reg.E=0x%02x\n",buf[0]);
		lock=buf[0] &0x06;
		
		if (lock==6)
			break;
		
		dprintk("mt2032: pll wait 1ms for lock (0x%2x)\n",buf[0]);
		udelay(1000);
	}
        return lock;
}

static int mt2032_optimize_vco(struct i2c_client *c,int sel,int lock)
{
	unsigned char buf[2];
	int tad1;

	buf[0]=0x0f;
	i2c_master_send(c,buf,1);
	i2c_master_recv(c,buf,1);
	dprintk("mt2032 Reg.F=0x%02x\n",buf[0]);
	tad1=buf[0]&0x07;

	if(tad1 ==0) return lock;
	if(tad1 ==1) return lock;

	if(tad1==2) {
		if(sel==0) 
			return lock;
		else sel--;
	}
	else {
		if(sel<4)
			sel++;
		else
			return lock;
	}

	dprintk("mt2032 optimize_vco: sel=%d\n",sel);

	buf[0]=0x0f;
	buf[1]=sel;
        i2c_master_send(c,buf,2);
	lock=mt2032_check_lo_lock(c);
	return lock;
}


static void mt2032_set_if_freq(struct i2c_client *c, unsigned int rfin,
			       unsigned int if1, unsigned int if2,
			       unsigned int from, unsigned int to)
{
	unsigned char buf[21];
	int lint_try,ret,sel,lock=0;
	struct tuner *t = i2c_get_clientdata(c);

	dprintk("mt2032_set_if_freq rfin=%d if1=%d if2=%d from=%d to=%d\n",rfin,if1,if2,from,to);

        buf[0]=0;
        ret=i2c_master_send(c,buf,1);
        i2c_master_recv(c,buf,21);

	buf[0]=0;
	ret=mt2032_compute_freq(rfin,if1,if2,from,to,&buf[1],&sel,t->xogc);
	if (ret<0)
		return;

        // send only the relevant registers per Rev. 1.2
        buf[0]=0;
        ret=i2c_master_send(c,buf,4);
        buf[5]=5;
        ret=i2c_master_send(c,buf+5,4);
        buf[11]=11;
        ret=i2c_master_send(c,buf+11,3);
        if(ret!=3)
                printk("mt2032_set_if_freq failed with %d\n",ret);

	// wait for PLLs to lock (per manual), retry LINT if not.
	for(lint_try=0; lint_try<2; lint_try++) {
		lock=mt2032_check_lo_lock(c);
		
		if(optimize_vco)
			lock=mt2032_optimize_vco(c,sel,lock);
		if(lock==6) break;
		
		printk("mt2032: re-init PLLs by LINT\n"); 
		buf[0]=7; 
		buf[1]=0x80 +8+t->xogc; // set LINT to re-init PLLs
		i2c_master_send(c,buf,2);
		mdelay(10);
		buf[1]=8+t->xogc;
		i2c_master_send(c,buf,2);
        }

	if (lock!=6)
		printk("MT2032 Fatal Error: PLLs didn't lock.\n");

	buf[0]=2;
	buf[1]=0x20; // LOGC for optimal phase noise
	ret=i2c_master_send(c,buf,2);
	if (ret!=2)
		printk("mt2032_set_if_freq2 failed with %d\n",ret);
}


static void mt2032_set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	int if2,from,to;

	// signal bandwidth and picture carrier
	if (t->mode == VIDEO_MODE_NTSC) {
		from=40750*1000;
		to=46750*1000;
		if2=45750*1000; 
	} else {
		// Pal 
		from=32900*1000;
		to=39900*1000;
		if2=38900*1000;
	}

        mt2032_set_if_freq(c, freq*62500 /* freq*1000*1000/16 */,
			   1090*1000*1000, if2, from, to);
}

static void mt2032_set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	int if2 = t->radio_if2;

	// per Manual for FM tuning: first if center freq. 1085 MHz
        mt2032_set_if_freq(c, freq*62500 /* freq*1000*1000/16 */,
			   1085*1000*1000,if2,if2,if2);
}

// Initalization as described in "MT203x Programming Procedures", Rev 1.2, Feb.2001
static int mt2032_init(struct i2c_client *c)
{
	struct tuner *t = i2c_get_clientdata(c);
        unsigned char buf[21];
        int ret,xogc,xok=0;

	// Initialize Registers per spec.
        buf[1]=2; // Index to register 2
        buf[2]=0xff;
        buf[3]=0x0f;
        buf[4]=0x1f;
        ret=i2c_master_send(c,buf+1,4);

        buf[5]=6; // Index register 6
        buf[6]=0xe4;
        buf[7]=0x8f;
        buf[8]=0xc3;
        buf[9]=0x4e;
        buf[10]=0xec;
        ret=i2c_master_send(c,buf+5,6);

        buf[12]=13;  // Index register 13
        buf[13]=0x32;
        ret=i2c_master_send(c,buf+12,2);

        // Adjust XOGC (register 7), wait for XOK
        xogc=7;
        do {
		dprintk("mt2032: xogc = 0x%02x\n",xogc&0x07);
                mdelay(10);
                buf[0]=0x0e;
                i2c_master_send(c,buf,1);
                i2c_master_recv(c,buf,1);
                xok=buf[0]&0x01;
                dprintk("mt2032: xok = 0x%02x\n",xok);
                if (xok == 1) break;

                xogc--;
                dprintk("mt2032: xogc = 0x%02x\n",xogc&0x07);
                if (xogc == 3) {
                        xogc=4; // min. 4 per spec
                        break;
                }
                buf[0]=0x07;
                buf[1]=0x88 + xogc;
                ret=i2c_master_send(c,buf,2);
                if (ret!=2)
                        printk("mt2032_init failed with %d\n",ret);
        } while (xok != 1 );
	t->xogc=xogc;

	t->tv_freq    = mt2032_set_tv_freq;
	t->radio_freq = mt2032_set_radio_freq;
        return(1);
}

static void mt2050_set_if_freq(struct i2c_client *c,unsigned int freq, unsigned int if2)
{
	unsigned int if1=1218*1000*1000;
	unsigned int f_lo1,f_lo2,lo1,lo2,f_lo1_modulo,f_lo2_modulo,num1,num2,div1a,div1b,div2a,div2b;
	int ret;
	unsigned char buf[6];
	
	dprintk("mt2050_set_if_freq freq=%d\n",freq);
	
	f_lo1=freq+if1;
	f_lo1=(f_lo1/1000000)*1000000;
	
	f_lo2=f_lo1-freq-if2;
	f_lo2=(f_lo2/50000)*50000;
	
	lo1=f_lo1/4000000;
	lo2=f_lo2/4000000;
	
	f_lo1_modulo= f_lo1-(lo1*4000000);
	f_lo2_modulo= f_lo2-(lo2*4000000);
	
	num1=4*f_lo1_modulo/4000000;
	num2=4096*(f_lo2_modulo/1000)/4000;
	
	// todo spurchecks
	
	div1a=(lo1/12)-1;
	div1b=lo1-(div1a+1)*12;
	
	div2a=(lo2/8)-1;
	div2b=lo2-(div2a+1)*8;
	
	dprintk("lo1 lo2 = %d %d\n", lo1, lo2);
        dprintk("num1 num2 div1a div1b div2a div2b= %x %x %x %x %x %x\n",num1,num2,div1a,div1b,div2a,div2b);
	
	
	buf[0]=1;
	buf[1]= 4*div1b + num1;
	if(freq<275*1000*1000) buf[1] = buf[1]|0x80;
	
	buf[2]=div1a;
	buf[3]=32*div2b + num2/256;
	buf[4]=num2-(num2/256)*256;
	buf[5]=div2a;
	if(num2!=0) buf[5]=buf[5]|0x40;
	
	if(debug) {
		int i;
		printk("bufs is: ");
		for(i=0;i<6;i++)
			printk("%x ",buf[i]);
		printk("\n");
	}
	
	ret=i2c_master_send(c,buf,6);
        if (ret!=6)
                printk("mt2050_set_if_freq failed with %d\n",ret);
}

static void mt2050_set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	unsigned int if2;
	
	if (t->mode == VIDEO_MODE_NTSC) {
                if2=45750*1000;
        } else {
                // Pal
                if2=38900*1000;
        }
	mt2050_set_if_freq(c,freq*62500,if2);
}

static void mt2050_set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	int if2 = t->radio_if2;
	
	mt2050_set_if_freq(c, freq*62500, if2);
}

static int mt2050_init(struct i2c_client *c)
{
	struct tuner *t = i2c_get_clientdata(c);
	unsigned char buf[2];
	int ret;
	
	buf[0]=6;
	buf[1]=0x10;
	ret=i2c_master_send(c,buf,2); //  power
	
	buf[0]=0x0f;
	buf[1]=0x0f;
	ret=i2c_master_send(c,buf,2); // m1lo
	
	buf[0]=0x0d;
	ret=i2c_master_send(c,buf,1);
	i2c_master_recv(c,buf,1);
	
	dprintk("mt2050: sro is %x\n",buf[0]);
	t->tv_freq    = mt2050_set_tv_freq;
	t->radio_freq = mt2050_set_radio_freq;
	return 0;
}

static int microtune_init(struct i2c_client *c)
{
	struct tuner *t = i2c_get_clientdata(c);
	char *name;
        unsigned char buf[21];
	int company_code;
	
        buf[0] = 0;
	t->tv_freq = NULL;
	t->radio_freq = NULL;
	name = "unknown";

        i2c_master_send(c,buf,1);
        i2c_master_recv(c,buf,21);
        if(debug) {
                int i;
                printk(KERN_DEBUG "tuner: MT2032 hexdump:\n");
                for(i=0;i<21;i++) {
                        printk(" %02x",buf[i]);
                        if(((i+1)%8)==0) printk(" ");
                        if(((i+1)%16)==0) printk("\n ");
                }
                printk("\n ");
        }
	company_code = buf[0x11] << 8 | buf[0x12];
        printk("tuner: microtune: companycode=%04x part=%02x rev=%02x\n",
	       company_code,buf[0x13],buf[0x14]);
	switch (company_code) {
	case 0x3cbf:
	case 0x3dbf:
	case 0x4d54:
	case 0x8e81:
	case 0x8e91:
		/* ok (?) */
		break;
	default:
		printk("tuner: microtune: unknown companycode\n");
		return 0;
	}

	if (buf[0x13] < ARRAY_SIZE(microtune_part) &&
	    NULL != microtune_part[buf[0x13]])
		name = microtune_part[buf[0x13]];
	switch (buf[0x13]) {
	case MT2032:
		mt2032_init(c);
		break;
	case MT2050:
		mt2050_init(c);
		break;
	default:
		printk("tuner: microtune %s found, not (yet?) supported, sorry :-/\n",
		       name);
                return 0;
        }
	printk("tuner: microtune %s found, OK\n",name);
	return 0;
}

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

static void default_set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	u8 config;
	u16 div;
	struct tunertype *tun;
        unsigned char buffer[4];
	int rc;

	tun=&tuners[t->type];
	if (freq < tun->thresh1) 
		config = tun->VHF_L;
	else if (freq < tun->thresh2) 
		config = tun->VHF_H;
	else
		config = tun->UHF;


	/* tv norm specific stuff for multi-norm tuners */
	switch (t->type) {
	case TUNER_PHILIPS_SECAM: // FI1216MF
		/* 0x01 -> ??? no change ??? */
		/* 0x02 -> PAL BDGHI / SECAM L */
		/* 0x04 -> ??? PAL others / SECAM others ??? */
		config &= ~0x02;
		if (t->mode == VIDEO_MODE_SECAM)
			config |= 0x02;
		break;

	case TUNER_TEMIC_4046FM5:
		config &= ~0x0f;
		switch (pal[0]) {
		case 'i':
		case 'I':
			config |= TEMIC_SET_PAL_I;
			break;
		case 'd':
		case 'D':
			config |= TEMIC_SET_PAL_DK;
			break;
		case 'l':
		case 'L':
			config |= TEMIC_SET_PAL_L;
			break;
		case 'b':
		case 'B':
		case 'g':
		case 'G':
		default:
			config |= TEMIC_SET_PAL_BG;
			break;
		}
		break;

	case TUNER_PHILIPS_FQ1216ME:
		config &= ~0x0f;
		switch (pal[0]) {
		case 'i':
		case 'I':
			config |= PHILIPS_SET_PAL_I;
			break;
		case 'l':
		case 'L':
			config |= PHILIPS_SET_PAL_L;
			break;
		case 'd':
		case 'D':
		case 'b':
		case 'B':
		case 'g':
		case 'G':
			config |= PHILIPS_SET_PAL_BGDK;
			break;
		}
		break;

	case TUNER_PHILIPS_ATSC:
		/* 0x00 -> ATSC antenna input 1 */
		/* 0x01 -> ATSC antenna input 2 */
		/* 0x02 -> NTSC antenna input 1 */
		/* 0x03 -> NTSC antenna input 2 */
		
		config &= ~0x03;
#ifdef VIDEO_MODE_ATSC
		if (VIDEO_MODE_ATSC != t->mode)
			config |= 2;
#endif
		/* FIXME: input */
		break;
	}

	
	/*
	 * Philips FI1216MK2 remark from specification :
	 * for channel selection involving band switching, and to ensure
	 * smooth tuning to the desired channel without causing
	 * unnecessary charge pump action, it is recommended to consider
	 * the difference between wanted channel frequency and the
	 * current channel frequency.  Unnecessary charge pump action
	 * will result in very low tuning voltage which may drive the
	 * oscillator to extreme conditions.
	 *
	 * Progfou: specification says to send config data before
	 * frequency in case (wanted frequency < current frequency).
	 */

	div=freq + tun->IFPCoff;
	if (t->type == TUNER_PHILIPS_SECAM && freq < t->freq) {
		buffer[0] = tun->config;
		buffer[1] = config;
		buffer[2] = (div>>8) & 0x7f;
		buffer[3] = div      & 0xff;
	} else {
		buffer[0] = (div>>8) & 0x7f;
		buffer[1] = div      & 0xff;
		buffer[2] = tun->config;
		buffer[3] = config;
	}
	dprintk("tuner: tv 0x%02x 0x%02x 0x%02x 0x%02x\n",
		buffer[0],buffer[1],buffer[2],buffer[3]);

        if (4 != (rc = i2c_master_send(c,buffer,4)))
                printk("tuner: i2c i/o error: rc == %d (should be 4)\n",rc);

}

static void default_set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tunertype *tun;
	struct tuner *t = i2c_get_clientdata(c);
        unsigned char buffer[4];
	unsigned div;
	int rc;

	tun=&tuners[t->type];
	div = freq + (int)(16*10.7);
        buffer[0] = (div>>8) & 0x7f;
        buffer[1] = div      & 0xff;
	buffer[2] = tun->config;
	switch (t->type) {
	case TUNER_PHILIPS_FM1216ME_MK3:
	case TUNER_PHILIPS_FM1236_MK3:
		buffer[3] = 0x19;
		break;
	default:
		buffer[3] = 0xa4;
		break;
	}

	dprintk("tuner: radio 0x%02x 0x%02x 0x%02x 0x%02x\n",
		buffer[0],buffer[1],buffer[2],buffer[3]);

        if (4 != (rc = i2c_master_send(c,buffer,4)))
                printk("tuner: i2c i/o error: rc == %d (should be 4)\n",rc);
}

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

// Set tuner frequency,  freq in Units of 62.5kHz = 1/16MHz
static void set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);

	if (t->type == UNSET) {
		printk("tuner: tuner type not set\n");
		return;
	}
	if (NULL == t->tv_freq) {
		printk("tuner: Huh? tv_set is NULL?\n");
		return;
	}
	if (freq < tv_range[0]*16 || freq > tv_range[1]*16) {
		/* FIXME: better do that chip-specific, but
		   right now we don't have that in the config
		   struct and this way is still better than no
		   check at all */
		printk("tuner: TV freq (%d.%02d) out of range (%d-%d)\n",
		       freq/16,freq%16*100/16,tv_range[0],tv_range[1]);
		return;
	}
	t->tv_freq(c,freq);
}

static void set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);

	if (t->type == UNSET) {
		printk("tuner: tuner type not set\n");
		return;
	}
	if (NULL == t->radio_freq) {
		printk("tuner: no radio tuning for this one, sorry.\n");
		return;
	}
	if (freq < radio_range[0]*16 || freq > radio_range[1]*16) {
		printk("tuner: radio freq (%d.%02d) out of range (%d-%d)\n",
		       freq/16,freq%16*100/16,
		       radio_range[0],radio_range[1]);
		return;
	}
	t->radio_freq(c,freq);
}

static void set_type(struct i2c_client *c, unsigned int type)
{
	struct tuner *t = i2c_get_clientdata(c);

	if (t->type != UNSET) {
		printk("tuner: type already set (%d)\n",t->type);
		return;
	}
	if (type >= TUNERS)
		return;

	t->type = type;
	printk("tuner: type set to %d (%s)\n", t->type,tuners[t->type].name);
	strlcpy(c->name, tuners[t->type].name, sizeof(c->name));

	switch (t->type) {
	case TUNER_MT2032:
		microtune_init(c);
		break;
	default:
		t->tv_freq    = default_set_tv_freq;
		t->radio_freq = default_set_radio_freq;
		break;
	}
}

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

static int tuner_attach(struct i2c_adapter *adap, int addr, int kind)
{
	struct tuner *t;
	struct i2c_client *client;

	if (this_adap > 0)
		return -1;
	this_adap++;
	
        client_template.adapter = adap;
        client_template.addr = addr;

        printk("tuner: chip found @ 0x%x\n", addr<<1);

        if (NULL == (client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL)))
                return -ENOMEM;
        memcpy(client,&client_template,sizeof(struct i2c_client));
        t = kmalloc(sizeof(struct tuner),GFP_KERNEL);
        if (NULL == t) {
                kfree(client);
                return -ENOMEM;
        }
        memset(t,0,sizeof(struct tuner));
	i2c_set_clientdata(client, t);
	t->type       = UNSET;
	t->radio_if2  = 10700*1000; // 10.7MHz - FM radio

        i2c_attach_client(client);
	if (type < TUNERS) {
		printk("tuner: type forced to %d (%s) [insmod]\n",
		       t->type,tuners[t->type].name);
		set_type(client,type);
	}
	return 0;
}

static int tuner_probe(struct i2c_adapter *adap)
{
	if (0 != addr) {
		normal_i2c_range[0] = addr;
		normal_i2c_range[1] = addr;
	}
	this_adap = 0;

#ifdef I2C_ADAP_CLASS_TV_ANALOG
	if (adap->class & I2C_ADAP_CLASS_TV_ANALOG)
		return i2c_probe(adap, &addr_data, tuner_attach);
#else
	switch (adap->id) {
	case I2C_ALGO_BIT | I2C_HW_B_BT848:
	case I2C_ALGO_BIT | I2C_HW_B_RIVA:
	case I2C_ALGO_SAA7134:
	case I2C_ALGO_SAA7146:
		return i2c_probe(adap, &addr_data, tuner_attach);
		break;
	}
#endif
	return 0;
}

static int tuner_detach(struct i2c_client *client)
{
	struct tuner *t = i2c_get_clientdata(client);

	i2c_detach_client(client);
	kfree(t);
	kfree(client);
	return 0;
}

static int
tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct tuner *t = i2c_get_clientdata(client);
        unsigned int *iarg = (int*)arg;

        switch (cmd) {

	/* --- configuration --- */
	case TUNER_SET_TYPE:
		set_type(client,*iarg);
		break;
	case AUDC_SET_RADIO:
		if (!t->radio) {
			set_tv_freq(client,400 * 16);
			t->radio = 1;
		}
		break;
	case AUDC_CONFIG_PINNACLE:
		switch (*iarg) {
		case 2:
			dprintk("tuner: pinnacle pal\n");
			t->radio_if2 = 33300 * 1000;
			break;
		case 3:
			dprintk("tuner: pinnacle ntsc\n");
			t->radio_if2 = 41300 * 1000;
			break;
		}
                break;
		
	/* --- v4l ioctls --- */
	/* take care: bttv does userspace copying, we'll get a
	   kernel pointer here... */
	case VIDIOCSCHAN:
	{
		struct video_channel *vc = arg;

		t->radio = 0;
		t->mode = vc->norm;
		if (t->freq)
			set_tv_freq(client,t->freq);
		return 0;
	}
	case VIDIOCSFREQ:
	{
		unsigned long *v = arg;

		if (t->radio) {
			dprintk("tuner: radio freq set to %lu.%02lu\n",
				(*v)/16,(*v)%16*100/16);
			set_radio_freq(client,*v);
		} else {
			dprintk("tuner: tv freq set to %lu.%02lu\n",
				(*v)/16,(*v)%16*100/16);
			set_tv_freq(client,*v);
		}
		t->freq = *v;
		return 0;
	}
	case VIDIOCGTUNER:
	{
		struct video_tuner *vt = arg;

		if (t->radio)
			vt->signal = tuner_signal(client);
		return 0;
	}
	case VIDIOCGAUDIO:
	{
		struct video_audio *va = arg;
		if (t->radio)
			va->mode = (tuner_stereo(client) ? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO);
		return 0;
	}
	default:
		/* nothing */
		break;
	}
	
	return 0;
}

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

static struct i2c_driver driver = {
	.owner          = THIS_MODULE,
        .name           = "i2c TV tuner driver",
        .id             = I2C_DRIVERID_TUNER,
        .flags          = I2C_DF_NOTIFY,
        .attach_adapter = tuner_probe,
        .detach_client  = tuner_detach,
        .command        = tuner_command,
};
static struct i2c_client client_template =
{
	I2C_DEVNAME("(tuner unset)"),
	.flags      = I2C_CLIENT_ALLOW_USE,
        .driver     = &driver,
};

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

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

module_init(tuner_init_module);
module_exit(tuner_cleanup_module);

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