drivers/media/dvb-frontends/ts2020.c - vendor/opensource/backports - Git at Google

 /*
     Montage Technology TS2020 - Silicon Tuner driver
     Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>

     Copyright (C) 2009-2012 TurboSight.com

     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 "dvb_frontend.h"
 #include "ts2020.h"

 #define TS2020_XTAL_FREQ   27000 /* in kHz */
 #define FREQ_OFFSET_LOW_SYM_RATE 3000

 struct ts2020_priv {
 	/* i2c details */
 	int i2c_address;
 	struct i2c_adapter *i2c;
 	u8 clk_out_div;
 	u32 frequency;
 	u32 frequency_div;
 };

 static int ts2020_release(struct dvb_frontend *fe)
 {
 	kfree(fe->tuner_priv);
 	fe->tuner_priv = NULL;
 	return 0;
 }

 static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
 {
 	struct ts2020_priv *priv = fe->tuner_priv;
 	u8 buf[] = { reg, data };
 	struct i2c_msg msg[] = {
 		{
 			.addr = priv->i2c_address,
 			.flags = 0,
 			.buf = buf,
 			.len = 2
 		}
 	};
 	int err;

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 1);

 	err = i2c_transfer(priv->i2c, msg, 1);
 	if (err != 1) {
 		printk(KERN_ERR
 		       "%s: writereg error(err == %i, reg == 0x%02x, value == 0x%02x)\n",
 		       __func__, err, reg, data);
 		return -EREMOTEIO;
 	}

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0);

 	return 0;
 }

 static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
 {
 	struct ts2020_priv *priv = fe->tuner_priv;
 	int ret;
 	u8 b0[] = { reg };
 	u8 b1[] = { 0 };
 	struct i2c_msg msg[] = {
 		{
 			.addr = priv->i2c_address,
 			.flags = 0,
 			.buf = b0,
 			.len = 1
 		}, {
 			.addr = priv->i2c_address,
 			.flags = I2C_M_RD,
 			.buf = b1,
 			.len = 1
 		}
 	};

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 1);

 	ret = i2c_transfer(priv->i2c, msg, 2);

 	if (ret != 2) {
 		printk(KERN_ERR "%s: reg=0x%x(error=%d)\n",
 		       __func__, reg, ret);
 		return ret;
 	}

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0);

 	return b1[0];
 }

 static int ts2020_sleep(struct dvb_frontend *fe)
 {
 	struct ts2020_priv *priv = fe->tuner_priv;
 	int ret;
 	u8 buf[] = { 10, 0 };
 	struct i2c_msg msg = {
 		.addr = priv->i2c_address,
 		.flags = 0,
 		.buf = buf,
 		.len = 2
 	};

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 1);

 	ret = i2c_transfer(priv->i2c, &msg, 1);
 	if (ret != 1)
 		printk(KERN_ERR "%s: i2c error\n", __func__);

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0);

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

 static int ts2020_init(struct dvb_frontend *fe)
 {
 	struct ts2020_priv *priv = fe->tuner_priv;

 	ts2020_writereg(fe, 0x42, 0x73);
 	ts2020_writereg(fe, 0x05, priv->clk_out_div);
 	ts2020_writereg(fe, 0x20, 0x27);
 	ts2020_writereg(fe, 0x07, 0x02);
 	ts2020_writereg(fe, 0x11, 0xff);
 	ts2020_writereg(fe, 0x60, 0xf9);
 	ts2020_writereg(fe, 0x08, 0x01);
 	ts2020_writereg(fe, 0x00, 0x41);

 	return 0;
 }

 static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
 {
 	int ret;
 	ret = ts2020_writereg(fe, 0x51, 0x1f - offset);
 	ret |= ts2020_writereg(fe, 0x51, 0x1f);
 	ret |= ts2020_writereg(fe, 0x50, offset);
 	ret |= ts2020_writereg(fe, 0x50, 0x00);
 	msleep(20);
 	return ret;
 }

 static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
 {
 	int reg;

 	reg = ts2020_readreg(fe, 0x3d);
 	reg &= 0x7f;
 	if (reg < 0x16)
 		reg = 0xa1;
 	else if (reg == 0x16)
 		reg = 0x99;
 	else
 		reg = 0xf9;

 	ts2020_writereg(fe, 0x60, reg);
 	reg = ts2020_tuner_gate_ctrl(fe, 0x08);

 	return reg;
 }

 static int ts2020_set_params(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct ts2020_priv *priv = fe->tuner_priv;
 	int ret;
 	u32 frequency = c->frequency;
 	s32 offset_khz;
 	u32 symbol_rate = (c->symbol_rate / 1000);
 	u32 f3db, gdiv28;
 	u16 value, ndiv, lpf_coeff;
 	u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
 	u8 lo = 0x01, div4 = 0x0;

 	/* Calculate frequency divider */
 	if (frequency < priv->frequency_div) {
 		lo |= 0x10;
 		div4 = 0x1;
 		ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ;
 	} else
 		ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ;
 	ndiv = ndiv + ndiv % 2;
 	ndiv = ndiv - 1024;

 	ret = ts2020_writereg(fe, 0x10, 0x80 | lo);

 	/* Set frequency divider */
 	ret |= ts2020_writereg(fe, 0x01, (ndiv >> 8) & 0xf);
 	ret |= ts2020_writereg(fe, 0x02, ndiv & 0xff);

 	ret |= ts2020_writereg(fe, 0x03, 0x06);
 	ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
 	if (ret < 0)
 		return -ENODEV;

 	/* Tuner Frequency Range */
 	ret = ts2020_writereg(fe, 0x10, lo);

 	ret |= ts2020_tuner_gate_ctrl(fe, 0x08);

 	/* Tuner RF */
 	ret |= ts2020_set_tuner_rf(fe);

 	gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
 	ret |= ts2020_writereg(fe, 0x04, gdiv28 & 0xff);
 	ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 	if (ret < 0)
 		return -ENODEV;

 	value = ts2020_readreg(fe, 0x26);

 	f3db = (symbol_rate * 135) / 200 + 2000;
 	f3db += FREQ_OFFSET_LOW_SYM_RATE;
 	if (f3db < 7000)
 		f3db = 7000;
 	if (f3db > 40000)
 		f3db = 40000;

 	gdiv28 = gdiv28 * 207 / (value * 2 + 151);
 	mlpf_max = gdiv28 * 135 / 100;
 	mlpf_min = gdiv28 * 78 / 100;
 	if (mlpf_max > 63)
 		mlpf_max = 63;

 	lpf_coeff = 2766;

 	nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
 		(TS2020_XTAL_FREQ / 1000)  + 1) / 2;
 	if (nlpf > 23)
 		nlpf = 23;
 	if (nlpf < 1)
 		nlpf = 1;

 	lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 		* lpf_coeff * 2  / f3db + 1) / 2;

 	if (lpf_mxdiv < mlpf_min) {
 		nlpf++;
 		lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 			* lpf_coeff * 2  / f3db + 1) / 2;
 	}

 	if (lpf_mxdiv > mlpf_max)
 		lpf_mxdiv = mlpf_max;

 	ret = ts2020_writereg(fe, 0x04, lpf_mxdiv);
 	ret |= ts2020_writereg(fe, 0x06, nlpf);

 	ret |= ts2020_tuner_gate_ctrl(fe, 0x04);

 	ret |= ts2020_tuner_gate_ctrl(fe, 0x01);

 	msleep(80);
 	/* calculate offset assuming 96000kHz*/
 	offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
 		/ (6 + 8) / (div4 + 1) / 2;

 	priv->frequency = offset_khz;

 	return (ret < 0) ? -EINVAL : 0;
 }

 static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct ts2020_priv *priv = fe->tuner_priv;
 	*frequency = priv->frequency;
 	return 0;
 }

 /* read TS2020 signal strength */
 static int ts2020_read_signal_strength(struct dvb_frontend *fe,
 						u16 *signal_strength)
 {
 	u16 sig_reading, sig_strength;
 	u8 rfgain, bbgain;

 	rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
 	bbgain = ts2020_readreg(fe, 0x21) & 0x1f;

 	if (rfgain > 15)
 		rfgain = 15;
 	if (bbgain > 13)
 		bbgain = 13;

 	sig_reading = rfgain * 2 + bbgain * 3;

 	sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;

 	/* cook the value to be suitable for szap-s2 human readable output */
 	*signal_strength = sig_strength * 1000;

 	return 0;
 }

 static struct dvb_tuner_ops ts2020_tuner_ops = {
 	.info = {
 		.name = "TS2020",
 		.frequency_min = 950000,
 		.frequency_max = 2150000
 	},
 	.init = ts2020_init,
 	.release = ts2020_release,
 	.sleep = ts2020_sleep,
 	.set_params = ts2020_set_params,
 	.get_frequency = ts2020_get_frequency,
 	.get_rf_strength = ts2020_read_signal_strength,
 };

 struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
 					const struct ts2020_config *config,
 					struct i2c_adapter *i2c)
 {
 	struct ts2020_priv *priv = NULL;
 	u8 buf;

 	priv = kzalloc(sizeof(struct ts2020_priv), GFP_KERNEL);
 	if (priv == NULL)
 		return NULL;

 	priv->i2c_address = config->tuner_address;
 	priv->i2c = i2c;
 	priv->clk_out_div = config->clk_out_div;
 	priv->frequency_div = config->frequency_div;
 	fe->tuner_priv = priv;

 	if (!priv->frequency_div)
 		priv->frequency_div = 1060000;

 	/* Wake Up the tuner */
 	if ((0x03 & ts2020_readreg(fe, 0x00)) == 0x00) {
 		ts2020_writereg(fe, 0x00, 0x01);
 		msleep(2);
 	}

 	ts2020_writereg(fe, 0x00, 0x03);
 	msleep(2);

 	/* Check the tuner version */
 	buf = ts2020_readreg(fe, 0x00);
 	if ((buf == 0x01) || (buf == 0x41) || (buf == 0x81))
 		printk(KERN_INFO "%s: Find tuner TS2020!\n", __func__);
 	else {
 		printk(KERN_ERR "%s: Read tuner reg[0] = %d\n", __func__, buf);
 		kfree(priv);
 		return NULL;
 	}

 	memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
 				sizeof(struct dvb_tuner_ops));

 	return fe;
 }
 EXPORT_SYMBOL(ts2020_attach);

 MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
 MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
 MODULE_LICENSE("GPL");
	/*
	Montage Technology TS2020 - Silicon Tuner driver
	Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>

	Copyright (C) 2009-2012 TurboSight.com

	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 "dvb_frontend.h"
	#include "ts2020.h"

	#define TS2020_XTAL_FREQ 27000 /* in kHz */
	#define FREQ_OFFSET_LOW_SYM_RATE 3000

	struct ts2020_priv {
	/* i2c details */
	int i2c_address;
	struct i2c_adapter *i2c;
	u8 clk_out_div;
	u32 frequency;
	u32 frequency_div;
	};

	static int ts2020_release(struct dvb_frontend *fe)
	{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
	return 0;
	}

	static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
	{
	struct ts2020_priv *priv = fe->tuner_priv;
	u8 buf[] = { reg, data };
	struct i2c_msg msg[] = {
	{
	.addr = priv->i2c_address,
	.flags = 0,
	.buf = buf,
	.len = 2
	}
	};
	int err;

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);

	err = i2c_transfer(priv->i2c, msg, 1);
	if (err != 1) {
	printk(KERN_ERR
	"%s: writereg error(err == %i, reg == 0x%02x, value == 0x%02x)\n",
	__func__, err, reg, data);
	return -EREMOTEIO;
	}

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);

	return 0;
	}

	static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
	{
	struct ts2020_priv *priv = fe->tuner_priv;
	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {
	{
	.addr = priv->i2c_address,
	.flags = 0,
	.buf = b0,
	.len = 1
	}, {
	.addr = priv->i2c_address,
	.flags = I2C_M_RD,
	.buf = b1,
	.len = 1
	}
	};

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);

	ret = i2c_transfer(priv->i2c, msg, 2);

	if (ret != 2) {
	printk(KERN_ERR "%s: reg=0x%x(error=%d)\n",
	__func__, reg, ret);
	return ret;
	}

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);

	return b1[0];
	}

	static int ts2020_sleep(struct dvb_frontend *fe)
	{
	struct ts2020_priv *priv = fe->tuner_priv;
	int ret;
	u8 buf[] = { 10, 0 };
	struct i2c_msg msg = {
	.addr = priv->i2c_address,
	.flags = 0,
	.buf = buf,
	.len = 2
	};

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);

	ret = i2c_transfer(priv->i2c, &msg, 1);
	if (ret != 1)
	printk(KERN_ERR "%s: i2c error\n", __func__);

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);

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

	static int ts2020_init(struct dvb_frontend *fe)
	{
	struct ts2020_priv *priv = fe->tuner_priv;

	ts2020_writereg(fe, 0x42, 0x73);
	ts2020_writereg(fe, 0x05, priv->clk_out_div);
	ts2020_writereg(fe, 0x20, 0x27);
	ts2020_writereg(fe, 0x07, 0x02);
	ts2020_writereg(fe, 0x11, 0xff);
	ts2020_writereg(fe, 0x60, 0xf9);
	ts2020_writereg(fe, 0x08, 0x01);
	ts2020_writereg(fe, 0x00, 0x41);

	return 0;
	}

	static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
	{
	int ret;
	ret = ts2020_writereg(fe, 0x51, 0x1f - offset);
	ret \|= ts2020_writereg(fe, 0x51, 0x1f);
	ret \|= ts2020_writereg(fe, 0x50, offset);
	ret \|= ts2020_writereg(fe, 0x50, 0x00);
	msleep(20);
	return ret;
	}

	static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
	{
	int reg;

	reg = ts2020_readreg(fe, 0x3d);
	reg &= 0x7f;
	if (reg < 0x16)
	reg = 0xa1;
	else if (reg == 0x16)
	reg = 0x99;
	else
	reg = 0xf9;

	ts2020_writereg(fe, 0x60, reg);
	reg = ts2020_tuner_gate_ctrl(fe, 0x08);

	return reg;
	}

	static int ts2020_set_params(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct ts2020_priv *priv = fe->tuner_priv;
	int ret;
	u32 frequency = c->frequency;
	s32 offset_khz;
	u32 symbol_rate = (c->symbol_rate / 1000);
	u32 f3db, gdiv28;
	u16 value, ndiv, lpf_coeff;
	u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
	u8 lo = 0x01, div4 = 0x0;

	/* Calculate frequency divider */
	if (frequency < priv->frequency_div) {
	lo \|= 0x10;
	div4 = 0x1;
	ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ;
	} else
	ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ;
	ndiv = ndiv + ndiv % 2;
	ndiv = ndiv - 1024;

	ret = ts2020_writereg(fe, 0x10, 0x80 \| lo);

	/* Set frequency divider */
	ret \|= ts2020_writereg(fe, 0x01, (ndiv >> 8) & 0xf);
	ret \|= ts2020_writereg(fe, 0x02, ndiv & 0xff);

	ret \|= ts2020_writereg(fe, 0x03, 0x06);
	ret \|= ts2020_tuner_gate_ctrl(fe, 0x10);
	if (ret < 0)
	return -ENODEV;

	/* Tuner Frequency Range */
	ret = ts2020_writereg(fe, 0x10, lo);

	ret \|= ts2020_tuner_gate_ctrl(fe, 0x08);

	/* Tuner RF */
	ret \|= ts2020_set_tuner_rf(fe);

	gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
	ret \|= ts2020_writereg(fe, 0x04, gdiv28 & 0xff);
	ret \|= ts2020_tuner_gate_ctrl(fe, 0x04);
	if (ret < 0)
	return -ENODEV;

	value = ts2020_readreg(fe, 0x26);

	f3db = (symbol_rate * 135) / 200 + 2000;
	f3db += FREQ_OFFSET_LOW_SYM_RATE;
	if (f3db < 7000)
	f3db = 7000;
	if (f3db > 40000)
	f3db = 40000;

	gdiv28 = gdiv28 * 207 / (value * 2 + 151);
	mlpf_max = gdiv28 * 135 / 100;
	mlpf_min = gdiv28 * 78 / 100;
	if (mlpf_max > 63)
	mlpf_max = 63;

	lpf_coeff = 2766;

	nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
	(TS2020_XTAL_FREQ / 1000) + 1) / 2;
	if (nlpf > 23)
	nlpf = 23;
	if (nlpf < 1)
	nlpf = 1;

	lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
	* lpf_coeff * 2 / f3db + 1) / 2;

	if (lpf_mxdiv < mlpf_min) {
	nlpf++;
	lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
	* lpf_coeff * 2 / f3db + 1) / 2;
	}

	if (lpf_mxdiv > mlpf_max)
	lpf_mxdiv = mlpf_max;

	ret = ts2020_writereg(fe, 0x04, lpf_mxdiv);
	ret \|= ts2020_writereg(fe, 0x06, nlpf);

	ret \|= ts2020_tuner_gate_ctrl(fe, 0x04);

	ret \|= ts2020_tuner_gate_ctrl(fe, 0x01);

	msleep(80);
	/* calculate offset assuming 96000kHz*/
	offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
	/ (6 + 8) / (div4 + 1) / 2;

	priv->frequency = offset_khz;

	return (ret < 0) ? -EINVAL : 0;
	}

	static int ts2020_get_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct ts2020_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
	}

	/* read TS2020 signal strength */
	static int ts2020_read_signal_strength(struct dvb_frontend *fe,
	u16 *signal_strength)
	{
	u16 sig_reading, sig_strength;
	u8 rfgain, bbgain;

	rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
	bbgain = ts2020_readreg(fe, 0x21) & 0x1f;

	if (rfgain > 15)
	rfgain = 15;
	if (bbgain > 13)
	bbgain = 13;

	sig_reading = rfgain * 2 + bbgain * 3;

	sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;

	/* cook the value to be suitable for szap-s2 human readable output */
	signal_strength = sig_strength 1000;

	return 0;
	}

	static struct dvb_tuner_ops ts2020_tuner_ops = {
	.info = {
	.name = "TS2020",
	.frequency_min = 950000,
	.frequency_max = 2150000
	},
	.init = ts2020_init,
	.release = ts2020_release,
	.sleep = ts2020_sleep,
	.set_params = ts2020_set_params,
	.get_frequency = ts2020_get_frequency,
	.get_rf_strength = ts2020_read_signal_strength,
	};

	struct dvb_frontend ts2020_attach(struct dvb_frontend fe,
	const struct ts2020_config *config,
	struct i2c_adapter *i2c)
	{
	struct ts2020_priv *priv = NULL;
	u8 buf;

	priv = kzalloc(sizeof(struct ts2020_priv), GFP_KERNEL);
	if (priv == NULL)
	return NULL;

	priv->i2c_address = config->tuner_address;
	priv->i2c = i2c;
	priv->clk_out_div = config->clk_out_div;
	priv->frequency_div = config->frequency_div;
	fe->tuner_priv = priv;

	if (!priv->frequency_div)
	priv->frequency_div = 1060000;

	/* Wake Up the tuner */
	if ((0x03 & ts2020_readreg(fe, 0x00)) == 0x00) {
	ts2020_writereg(fe, 0x00, 0x01);
	msleep(2);
	}

	ts2020_writereg(fe, 0x00, 0x03);
	msleep(2);

	/* Check the tuner version */
	buf = ts2020_readreg(fe, 0x00);
	if ((buf == 0x01) \|\| (buf == 0x41) \|\| (buf == 0x81))
	printk(KERN_INFO "%s: Find tuner TS2020!\n", __func__);
	else {
	printk(KERN_ERR "%s: Read tuner reg[0] = %d\n", __func__, buf);
	kfree(priv);
	return NULL;
	}

	memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
	sizeof(struct dvb_tuner_ops));

	return fe;
	}
	EXPORT_SYMBOL(ts2020_attach);

	MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
	MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
	MODULE_LICENSE("GPL");