/* 
    Conexant 22702 DVB OFDM frontend driver

    based on:
        Alps TDMB7 DVB OFDM frontend driver

    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
	  Holger Waechtler <holger@convergence.de>

    Copyright (C) 2004 Steven Toth <steve@toth.demon.co.uk>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/    

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>

#include "dvb_frontend.h"

#define FRONTEND_NAME "dvbfe_cx22702"

#define I2C_DEMOD_SLAVE_ADDR  0x43
#define I2C_EEPROM_SLAVE_ADDR 0x50
#define I2C_PLL_SLAVE_ADDR    0x61

static int debug = 0;

#define dprintk	if (debug) printk

static struct dvb_frontend_info cx22702_info = {
	.name			= "CX22702 Demod Thompson 759x PLL",
	.type			= FE_OFDM,
	.frequency_min		= 177000000,
	.frequency_max		= 858000000,
	.frequency_stepsize	= 166666,
	.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
	FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
	FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | 
	FE_CAN_RECOVER
};

struct cx22702_state {
	struct i2c_adapter *i2c;
	struct dvb_adapter *dvb;
	struct dvb_frontend_info cx22702_info;
};

/* Register values to initialise the demod */
static u8 init_tab [] = {
	0x00, 0x00, /* Stop aquisition */
	0x09, 0x01, /* Set to software configure */
	0x0B, 0x04, /* TPS source = user given values */
	0x0C, 0x00, /* Bandwidth = 8MHz normal spectrum */
	0x0D, 0x80, /* Serial Bus Control address increment and serial passthru enabled */
	0x26, 0x80,
	0x2D, 0xff,
	0xDC, 0x00, /* Count BER IN AVERAGE MODE */
	0xE4, 0x00, /* Count BER IN AVERAGE MODE */
	0xF8, 0x02, /* MPEG Output Interface -- FALLING_CHANGES | SERIAL IO | OUTPUTENABLED */
};

static struct i2c_client client_template;

static int cx22702_writereg (struct i2c_adapter *i2c, u8 reg, u8 data)
{
	int ret;
	u8 buf [] = { reg, data };
	struct i2c_msg msg = { .addr = I2C_DEMOD_SLAVE_ADDR, .flags = 0, .buf = buf, .len = 2 };

	ret = i2c_transfer(i2c, &msg, 1);

	if (ret != 1) 
		printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
			__FUNCTION__, reg, data, ret);

	return (ret != 1) ? -1 : 0;
}

static u8 cx22702_readreg (struct i2c_adapter *i2c, u8 reg)
{
	int ret;
	u8 b0 [] = { reg };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
		{ .addr = I2C_DEMOD_SLAVE_ADDR, .flags = 0, .buf = b0, .len = 1 },
		{ .addr = I2C_DEMOD_SLAVE_ADDR, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
        
	ret = i2c_transfer(i2c, msg, 2);
        
	if (ret != 2) 
		printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);

	return b1[0];
}

static int pll_readreg(struct i2c_adapter *i2c, u8 reg)
{
	u8 b0 [] = { reg };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
		{ .addr = I2C_PLL_SLAVE_ADDR, .flags = 0,        .buf = b0, .len = 1 },
		{ .addr = I2C_PLL_SLAVE_ADDR, .flags = I2C_M_RD, .buf = b1, .len = 1 }
	};

	/* cx22702_writereg (i2c, 0x0D, cx22702_readreg(i2c,0x0D) &0xfe);  // Enable PLL bus */
	if (i2c_transfer(i2c, msg, 2) != 2) {
		printk ("%s i2c pll request failed\n", __FUNCTION__);
		return -ENODEV;
	}
	/* cx22702_writereg (i2c, 0x0D, cx22702_readreg(i2c,0x0D) | 1); // Disable PLL bus */

	return b1[0];
}

static int pll_write (struct i2c_adapter *i2c, u8 data [4])
{
	int ret=0;
	struct i2c_msg msg = { .addr = I2C_PLL_SLAVE_ADDR, .flags = 0, .buf = data, .len = 4 };

	/* cx22702_writereg (i2c, 0x0D, cx22702_readreg(i2c,0x0D) &0xfe);  // Enable PLL bus */
	ret = i2c_transfer(i2c, &msg, 1);
	/* cx22702_writereg (i2c, 0x0D, cx22702_readreg(i2c,0x0D) | 1); // Disable PLL bus */

	if (ret != 1)
		printk("%s: i/o error (addr == 0x%02x, ret == %i)\n", __FUNCTION__, msg.addr, ret);

	return (ret != 1) ? -1 : 0;
}

static int pll_set_tv_freq (struct i2c_adapter *i2c, u32 freq)
{
	int ret;

	u32 div = (freq + 36166667) / 166666;

	/* dividerhigh, divierlow, control, bandwidth switch tuner args */
	unsigned char buf [4] = {
		(div >> 8) & 0x7f,
		div & 0xff,
		0x84,
		0x00
	};

	if(freq < 470000000) {
		buf[3] = 0x02;
	} else {
		buf[3] = 0x08;
	}

#if 0
	if(bandw == BANDWIDTH_7MHz) {
		buf[4] |= 0x10;
	}
#endif
	// Now compensate for the charge pump osc

	if(freq <= 264000000) {
		buf[2] = buf[2] | 0x30;
	} else if (freq <= 735000000) {
		buf[2] = buf[2] | 0x38;
	} else if (freq <= 835000000) {
		buf[2] = buf[2] | 0x70;
	} else if (freq <= 896000000) {
		buf[2] = buf[2] | 0x78;
	}	

	buf[2]=0xbc;

	dprintk ("%s: freq == %i, div == 0x%04x\n", __FUNCTION__, (int) freq, (int) div);

	ret= pll_write (i2c, buf);
	if(ret<0) {
		dprintk ("%s: first pll_write failed\n",__FUNCTION__);
		return ret;
	}

	/* Set the AGC to search */
	buf[2]=0x9c;
	buf[3]=0xa0;
	ret=pll_write (i2c, buf);
	if(ret<0) {
		dprintk ("%s: second pll_write failed\n",__FUNCTION__);
		return ret;
	}

	/* Tuner needs a small amount of time */
	__udelay(100*1000);

	buf[3]=0x20;
	ret=pll_write (i2c, buf);
	if(ret<0) {
		dprintk ("%s: third pll_write failed\n",__FUNCTION__);
		return ret;
	}

	return ret;

}

/* Reset the demod hardware and reset all of the configuration registers
   to a default state. */
static int cx22702_init (struct i2c_adapter *i2c)
{
	int i;

	cx22702_writereg (i2c, 0x00, 0x02);
	cx22702_writereg (i2c, 0x00, 0x00);

	msleep(10);
	
	for (i=0; i<sizeof(init_tab); i+=2)
		cx22702_writereg (i2c, init_tab[i], init_tab[i+1]);

	cx22702_writereg (i2c, 0x00, 0x01);
	return 0;	
}

static int cx22702_set_inversion (struct i2c_adapter *i2c, int inversion)
{
	u8 val;

	switch (inversion) {

		case INVERSION_AUTO:
			return -EOPNOTSUPP;

		case INVERSION_ON:
			val = cx22702_readreg (i2c, 0x0C);
			return cx22702_writereg (i2c, 0x0C, val | 0x01);

		case INVERSION_OFF:
			val = cx22702_readreg (i2c, 0x0C);
			return cx22702_writereg (i2c, 0x0C, val & 0xfe);

		default:
			return -EINVAL;

	}

}

/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int cx22702_set_tps (struct i2c_adapter *i2c,
	struct dvb_ofdm_parameters *p)
{
	u8 val;

	switch(p->bandwidth) {
		case BANDWIDTH_6_MHZ:
			cx22702_writereg(i2c, 0x0C, cx22702_readreg(i2c, 0x0C) | 0x20 );
			break;
		case BANDWIDTH_7_MHZ:
			cx22702_writereg(i2c, 0x0C, cx22702_readreg(i2c, 0x0C) | 0x10 );
			break;
		case BANDWIDTH_8_MHZ:
			cx22702_writereg(i2c, 0x0C, cx22702_readreg(i2c, 0x0C) &0xcf );
			break;
		default:
			dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
			return -EINVAL;
	}

#if 0
	/* try an do as much configuration automatically as possible */
	if( (p->bandwidth==BANDWIDTH_AUTO) || 
			(p->hierarchy_information==HIERARCHY_AUTO) || 
			(p->constellation==QAM_AUTO) || 
			(p->code_rate_HP==FEC_AUTO) || 
			(p->code_rate_LP==FEC_AUTO) || 
			(p->guard_interval==GUARD_INTERVAL_AUTO) || 
			(p->transmission_mode==TRANSMISSION_MODE_AUTO) ) {

		/* TPS Source - use hardware driven values */
		cx22702_writereg(i2c, 0x0B, cx22702_readreg(i2c, 0x0B) & 0xfd );
		cx22702_writereg(i2c, 0x00, 0x01); /* Begin aquisition */
		printk("%s: Autodetecting\n",__FUNCTION__);
		return 0;
	}
#endif	

	val=0;
	switch(p->constellation) {
		case   QPSK: val &= 0xe7; break;
		case QAM_16: val |= 0x08; break;
		case QAM_64: val |= 0x10; break;
		default:
			dprintk ("%s: invalid constellation\n",__FUNCTION__);
			return -EINVAL;
	}
	switch(p->hierarchy_information) {
		case HIERARCHY_NONE: val = (val&0xf8); break;
		case    HIERARCHY_1: val = (val&0xf8)|1; break;
		case    HIERARCHY_2: val = (val&0xf8)|2; break;
		case    HIERARCHY_4: val = (val&0xf8)|3; break;
		default:
			dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg (i2c, 0x06, val);

	val=0;
	switch(p->code_rate_HP) {
		case FEC_NONE:
		case FEC_1_2: val = (val&0xc7); break;
		case FEC_2_3: val = (val&0xc7)|0x08; break;
		case FEC_3_4: val = (val&0xc7)|0x10; break;
		case FEC_5_6: val = (val&0xc7)|0x18; break;
		case FEC_7_8: val = (val&0xc7)|0x20; break;
		default:
			dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
			return -EINVAL;
	}
	/* dvbtune fails to set LP correctly, default to HP */
	/* switch(p->code_rate_LP) { */
	switch(p->code_rate_HP) {
		case FEC_NONE:
		case FEC_1_2: val = (val&0xf8); break;
		case FEC_2_3: val = (val&0xf8)|1; break;
		case FEC_3_4: val = (val&0xf8)|2; break;
		case FEC_5_6: val = (val&0xf8)|3; break;
		case FEC_7_8: val = (val&0xf8)|4; break;
		default:
			dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg (i2c, 0x07, val);

	val=0;
	switch(p->guard_interval) {
		case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
		case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
		case  GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
		case  GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
		default:
			dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
			return -EINVAL;
	}
	switch(p->transmission_mode) {
		case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
		case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
		default:
			dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg (i2c, 0x08, val);

	/* Force TPS Source - use user given values */
	cx22702_writereg(i2c, 0x0B, cx22702_readreg(i2c, 0x0B) | 0x02 );

	/* Begin channel aquisition */
	cx22702_writereg(i2c, 0x00, 0x01);

	return 0;
}

/* Retrieve the demod settings */
static int cx22702_get_tps (struct i2c_adapter *i2c,
	struct dvb_ofdm_parameters *p)
{
	u8 val;

	/* Make sure the TPS regs are valid */
	if (!(cx22702_readreg(i2c, 0x0A) & 0x20))
		return -EAGAIN;

	val = cx22702_readreg (i2c, 0x01);
	switch( (val&0x18)>>3) {
		case 0: p->constellation =   QPSK; break;
		case 1: p->constellation = QAM_16; break;
		case 2: p->constellation = QAM_64; break;
	}
	switch( val&0x07 ) {
		case 0: p->hierarchy_information = HIERARCHY_NONE; break;
		case 1: p->hierarchy_information =    HIERARCHY_1; break;
		case 2: p->hierarchy_information =    HIERARCHY_2; break;
		case 3: p->hierarchy_information =    HIERARCHY_4; break;
	}


	val = cx22702_readreg (i2c, 0x02);
	switch( (val&0x38)>>3 ) {
		case 0: p->code_rate_HP = FEC_1_2; break;
		case 1: p->code_rate_HP = FEC_2_3; break;
		case 2: p->code_rate_HP = FEC_3_4; break;
		case 3: p->code_rate_HP = FEC_5_6; break;
		case 4: p->code_rate_HP = FEC_7_8; break;
	}
	switch( val&0x07 ) {
		case 0: p->code_rate_LP = FEC_1_2; break;
		case 1: p->code_rate_LP = FEC_2_3; break;
		case 2: p->code_rate_LP = FEC_3_4; break;
		case 3: p->code_rate_LP = FEC_5_6; break;
		case 4: p->code_rate_LP = FEC_7_8; break;
	}


	val = cx22702_readreg (i2c, 0x03);
	switch( (val&0x0c)>>2 ) {
		case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
		case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
		case 2: p->guard_interval =  GUARD_INTERVAL_1_8; break;
		case 3: p->guard_interval =  GUARD_INTERVAL_1_4; break;
	}
	switch( val&0xfc ) {
		case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
		case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
	}

	return 0;
}

static int cx22702_ioctl (struct dvb_frontend *fe, unsigned int cmd, void *arg)
{
	struct cx22702_state *state = fe->data;
	struct i2c_adapter *i2c = state->i2c;
	u8 reg0A;
	u8 reg23;

	switch (cmd) {
		case FE_GET_INFO:
			memcpy (arg, &state->cx22702_info, sizeof(struct dvb_frontend_info));
			break;

		case FE_READ_STATUS:
		{
			fe_status_t *status = (fe_status_t *) arg;

			*status = 0;

			reg0A = cx22702_readreg (i2c, 0x0A);
			reg23 = cx22702_readreg (i2c, 0x23);

			dprintk ("%s: status demod=0x%02x agc=0x%02x pll=0x%02x\n"
				,__FUNCTION__,reg0A,reg23,pll_readreg(i2c,0xc2));

			if(reg0A & 0x10) {
				*status |= FE_HAS_LOCK;
				*status |= FE_HAS_VITERBI;
				*status |= FE_HAS_SYNC;
			}

			if(reg0A & 0x20) 
				*status |= FE_HAS_CARRIER;

			if(reg23 < 0xf0) 
				*status |= FE_HAS_SIGNAL;

			break;

		}

		case FE_READ_BER:
			if(cx22702_readreg (i2c, 0xE4) & 0x02) {
				/* Realtime statistics */
				*((u32*) arg) = (cx22702_readreg (i2c, 0xDE) & 0x7F) << 7
					| (cx22702_readreg (i2c, 0xDF)&0x7F);
			} else {
				/* Averagtine statistics */
				*((u32*) arg) = (cx22702_readreg (i2c, 0xDE) & 0x7F) << 7
					| cx22702_readreg (i2c, 0xDF);
			}
			break;

		case FE_READ_SIGNAL_STRENGTH:
		{
			u16 ss = cx22702_readreg (i2c, 0x23);
			*((u16*) arg) = ss;
			break;
		}

		/* We don't have an register for this */
		/* We'll take the inverse of the BER register */
		case FE_READ_SNR:
		{
			u16 rs_ber=0;
			if(cx22702_readreg (i2c, 0xE4) & 0x02) {
				/* Realtime statistics */
				rs_ber = (cx22702_readreg (i2c, 0xDE) & 0x7F) << 7
					| (cx22702_readreg (i2c, 0xDF)& 0x7F);
			} else {
				/* Averagine statistics */
				rs_ber = (cx22702_readreg (i2c, 0xDE) & 0x7F) << 8
					| cx22702_readreg (i2c, 0xDF);
			}
			*((u16*) arg) = ~rs_ber;
			break;
		}

		case FE_READ_UNCORRECTED_BLOCKS: 
			/* RS Uncorrectable Packet Count then reset */
			*((u32*) arg) = cx22702_readreg (i2c, 0xE3);
			cx22702_writereg (i2c, 0xE3, 0x00);
			break;

		case FE_SET_FRONTEND:
		{
			struct dvb_frontend_parameters *p = arg;
			int ret;

			/* Disable aquisition */
			cx22702_writereg (i2c, 0x00, 0x00);

			pll_set_tv_freq (i2c, p->frequency);
			cx22702_set_inversion (i2c, p->inversion);
			if((ret=cx22702_set_tps (i2c, &p->u.ofdm))<0) {
				dprintk ("%s: set_tps failed ret=%d\n",__FUNCTION__,ret);
				return ret;
			}

			/* Enable aquisition */
			cx22702_writereg (i2c, 0x00, 0x01);
			break;
		}

		case FE_GET_FRONTEND:
		{
			struct dvb_frontend_parameters *p = arg;
			u8 reg0C = cx22702_readreg (i2c, 0x0C);
		
			p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
			return cx22702_get_tps (i2c, &p->u.ofdm);
		}

		case FE_INIT:
			return cx22702_init (i2c);

		default:
			return -EOPNOTSUPP;
	};

	return 0;
}

/* Validate the eeprom contents, make sure content look ok.
   Get the eeprom data. */
static int cx22702_validate_eeprom(struct i2c_adapter *i2c, int* minfreq)
{
	u8 b0 [] = { 0 };
	u8 b1 [128];
	u32 model=0;
	u8 tuner=0;
	int i,j;

	struct i2c_msg msg [] = {
		{ .addr = I2C_EEPROM_SLAVE_ADDR, .flags = 0,        .buf = b0, .len = 1 },
		{ .addr = I2C_EEPROM_SLAVE_ADDR, .flags = I2C_M_RD, .buf = b1, .len = 128 }
	};

	if (i2c_transfer(i2c, msg, 2) != 2) {
		printk ("%s i2c eeprom request failed\n", __FUNCTION__);
		return -ENODEV;
	}

	if(debug) {
		dprintk ("i2c eeprom content:\n");
		j=0;
		for(i=0;i<128;i++) {
			dprintk("%02x ",b1[i]);
			if(j++==16) {
				dprintk("\n");
				j=0;
			}
		}
 		dprintk("\n");
	}

	if( (b1[8]!=0x84) || (b1[10]!=0x00) ) {
		printk ("%s eeprom content is not valid\n", __FUNCTION__);
		return -ENODEV;
	}

	/* Make sure we support the board model */
	model = b1[0x1f] << 24 | b1[0x1e] << 16 | b1[0x1d] << 8 | b1[0x1c];
	switch(model) {
		case 90002:
		case 90500:
		case 90501:
			dprintk ("%s: Model #%d\n",__FUNCTION__,model);
			break;	
		default:
			printk ("%s: Unknown model #%d not supported\n",__FUNCTION__,model);
			return -ENODEV;	
	}

	/* Make sure we support the tuner */
	tuner = b1[0x2d];
	switch(tuner) {
		case 0x4B:
			dprintk ("%s: Tuner Thompson DTT 7595\n",__FUNCTION__);
			*minfreq = 177000000;
			break;	
		case 0x4C:
			dprintk ("%s: Tuner Thompson DTT 7592\n",__FUNCTION__);
			*minfreq = 474000000;
			break;	
		default:
			printk ("%s: Unknown tuner 0x%02x not supported\n",__FUNCTION__,tuner);
			return -ENODEV;	
	}

	return 0;
}


/* Validate the demod, make sure we understand the hardware */
static int cx22702_validate_demod(struct i2c_adapter *i2c)
{
	u8 b0 [] = { 0x1f };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
		{ .addr = I2C_DEMOD_SLAVE_ADDR, .flags = 0,        .buf = b0, .len = 1 },
		{ .addr = I2C_DEMOD_SLAVE_ADDR, .flags = I2C_M_RD, .buf = b1, .len = 1 }
	};

	if (i2c_transfer(i2c, msg, 2) != 2) {
		printk ("%s i2c demod request failed\n", __FUNCTION__);
		return -ENODEV;
	}

	if( (b1[0]!=0x3) ) {
		printk ("%s i2c demod type 0x(%02x) not known\n", __FUNCTION__,b1[0]);
		return -ENODEV;
	}

	return 0;
}

/* Validate the tuner PLL, make sure we understand the hardware */
static int cx22702_validate_pll(struct i2c_adapter *i2c)
{
	int result=0;

	if( (result=pll_readreg(i2c,0xc2)) < 0)
		return result;

	if( (result >= 0) && (result&0x30) )
		return 0;

	return result;
}

/* Check we can see the I2c clients */
static int cx22702_attach_adapter(struct i2c_adapter *adapter)
{
	struct cx22702_state *state;
	struct i2c_client *client;
	int ret;
	int minfreq;

	dprintk("Trying to attach to adapter 0x%x:%s.\n",
		adapter->id, adapter->name);

	ret=cx22702_validate_eeprom(adapter, &minfreq);
	if(ret < 0)
		return ret;

	ret=cx22702_validate_demod(adapter);
	if(ret < 0)
		return ret;

	ret=cx22702_validate_pll(adapter);
	if(ret < 0)
		return ret;

	if ( !(state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL)) )
		return -ENOMEM;

	memset(state, 0, sizeof(struct cx22702_state));
	state->i2c = adapter;
	memcpy(&state->cx22702_info, &cx22702_info, sizeof(struct dvb_frontend_info));   
	state->cx22702_info.frequency_min = minfreq;
   
	if ( !(client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL)) ) {
		kfree(state);
		return -ENOMEM;
	}

	memcpy(client, &client_template, sizeof(struct i2c_client));
	client->adapter = adapter;
	client->addr = I2C_DEMOD_SLAVE_ADDR;
	i2c_set_clientdata(client, state);

	if ((ret = i2c_attach_client(client))) {
		kfree(client);
		kfree(state);
		return ret;
	}

	BUG_ON(!state->dvb);

	if ((ret = dvb_register_frontend(cx22702_ioctl, state->dvb, state,
		&state->cx22702_info, THIS_MODULE))) {
		i2c_detach_client(client);
		kfree(client);
		kfree(state);
		return ret;
	}

	return 0;	
}

static int cx22702_detach_client(struct i2c_client *client)
{
	struct cx22702_state *state = i2c_get_clientdata(client);

	dvb_unregister_frontend (cx22702_ioctl, state->dvb);
	i2c_detach_client(client);
	BUG_ON(state->dvb);
	kfree(client);
	return 0;
}

static int command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct cx22702_state *state = i2c_get_clientdata(client);

	switch(cmd) {
	case FE_REGISTER:
		state->dvb = arg;
		break;
	case FE_UNREGISTER:
		state->dvb = NULL;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static struct i2c_driver driver = {
	.owner = THIS_MODULE,
	.name  = FRONTEND_NAME,
	.id = I2C_DRIVERID_DVBFE_CX22702,
	.flags = I2C_DF_NOTIFY,
	.attach_adapter = cx22702_attach_adapter,
	.detach_client = cx22702_detach_client,
	.command = command,
};

static struct i2c_client client_template = {
	.name = FRONTEND_NAME,
	.flags = I2C_CLIENT_ALLOW_USE,
	.driver = &driver,
};

static int __init init_cx22702 (void)
{
	return i2c_add_driver(&driver);
}

static void __exit exit_cx22702 (void)
{
	if (i2c_del_driver(&driver))
		printk(KERN_ERR "cx22702: driver deregistration failed.\n");
}

module_init (init_cx22702);
module_exit (exit_cx22702);

MODULE_PARM(debug,"i");
MODULE_PARM_DESC(debug, "Enable verbose debug messages");
MODULE_DESCRIPTION("CX22702 / Thompson DTT 759x PLL DVB Frontend driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");