drivers/media/tuners/fc2580.c - kernel/msm-4.19 - Gitiles

 /*
  * FCI FC2580 silicon tuner driver
  *
  * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
  *
  *    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.,
  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #include "fc2580_priv.h"

 /*
  * TODO:
  * I2C write and read works only for one single register. Multiple registers
  * could not be accessed using normal register address auto-increment.
  * There could be (very likely) register to change that behavior....
  *
  * Due to that limitation functions:
  *   fc2580_wr_regs()
  *   fc2580_rd_regs()
  * could not be used for accessing more than one register at once.
  *
  * TODO:
  * Currently it blind writes bunch of static registers from the
  * fc2580_freq_regs_lut[] when fc2580_set_params() is called. Add some
  * logic to reduce unneeded register writes.
  */

 /* write multiple registers */
 static int fc2580_wr_regs(struct fc2580_priv *priv, u8 reg, u8 *val, int len)
 {
 	int ret;
 	u8 buf[1 + len];
 	struct i2c_msg msg[1] = {
 		{
 			.addr = priv->cfg->i2c_addr,
 			.flags = 0,
 			.len = sizeof(buf),
 			.buf = buf,
 		}
 	};

 	buf[0] = reg;
 	memcpy(&buf[1], val, len);

 	ret = i2c_transfer(priv->i2c, msg, 1);
 	if (ret == 1) {
 		ret = 0;
 	} else {
 		dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
 				"len=%d\n", KBUILD_MODNAME, ret, reg, len);
 		ret = -EREMOTEIO;
 	}
 	return ret;
 }

 /* read multiple registers */
 static int fc2580_rd_regs(struct fc2580_priv *priv, u8 reg, u8 *val, int len)
 {
 	int ret;
 	u8 buf[len];
 	struct i2c_msg msg[2] = {
 		{
 			.addr = priv->cfg->i2c_addr,
 			.flags = 0,
 			.len = 1,
 			.buf = &reg,
 		}, {
 			.addr = priv->cfg->i2c_addr,
 			.flags = I2C_M_RD,
 			.len = sizeof(buf),
 			.buf = buf,
 		}
 	};

 	ret = i2c_transfer(priv->i2c, msg, 2);
 	if (ret == 2) {
 		memcpy(val, buf, len);
 		ret = 0;
 	} else {
 		dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
 				"len=%d\n", KBUILD_MODNAME, ret, reg, len);
 		ret = -EREMOTEIO;
 	}

 	return ret;
 }

 /* write single register */
 static int fc2580_wr_reg(struct fc2580_priv *priv, u8 reg, u8 val)
 {
 	return fc2580_wr_regs(priv, reg, &val, 1);
 }

 /* read single register */
 static int fc2580_rd_reg(struct fc2580_priv *priv, u8 reg, u8 *val)
 {
 	return fc2580_rd_regs(priv, reg, val, 1);
 }

 /* write single register conditionally only when value differs from 0xff
  * XXX: This is special routine meant only for writing fc2580_freq_regs_lut[]
  * values. Do not use for the other purposes. */
 static int fc2580_wr_reg_ff(struct fc2580_priv *priv, u8 reg, u8 val)
 {
 	if (val == 0xff)
 		return 0;
 	else
 		return fc2580_wr_regs(priv, reg, &val, 1);
 }

 static int fc2580_set_params(struct dvb_frontend *fe)
 {
 	struct fc2580_priv *priv = fe->tuner_priv;
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	int ret = 0, i;
 	unsigned int r_val, n_val, k_val, k_val_reg, f_ref;
 	u8 tmp_val, r18_val;
 	u64 f_vco;

 	/*
 	 * Fractional-N synthesizer/PLL.
 	 * Most likely all those PLL calculations are not correct. I am not
 	 * sure, but it looks like it is divider based Fractional-N synthesizer.
 	 * There is divider for reference clock too?
 	 * Anyhow, synthesizer calculation results seems to be quite correct.
 	 */

 	dev_dbg(&priv->i2c->dev, "%s: delivery_system=%d frequency=%d " \
 			"bandwidth_hz=%d\n", __func__,
 			c->delivery_system, c->frequency, c->bandwidth_hz);

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

 	/* PLL */
 	for (i = 0; i < ARRAY_SIZE(fc2580_pll_lut); i++) {
 		if (c->frequency <= fc2580_pll_lut[i].freq)
 			break;
 	}

 	if (i == ARRAY_SIZE(fc2580_pll_lut))
 		goto err;

 	f_vco = c->frequency;
 	f_vco *= fc2580_pll_lut[i].div;

 	if (f_vco >= 2600000000UL)
 		tmp_val = 0x0e | fc2580_pll_lut[i].band;
 	else
 		tmp_val = 0x06 | fc2580_pll_lut[i].band;

 	ret = fc2580_wr_reg(priv, 0x02, tmp_val);
 	if (ret < 0)
 		goto err;

 	if (f_vco >= 2UL * 76 * priv->cfg->clock) {
 		r_val = 1;
 		r18_val = 0x00;
 	} else if (f_vco >= 1UL * 76 * priv->cfg->clock) {
 		r_val = 2;
 		r18_val = 0x10;
 	} else {
 		r_val = 4;
 		r18_val = 0x20;
 	}

 	f_ref = 2UL * priv->cfg->clock / r_val;
 	n_val = div_u64_rem(f_vco, f_ref, &k_val);
 	k_val_reg = 1UL * k_val * (1 << 20) / f_ref;

 	ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff));
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x1a, (k_val_reg >> 8) & 0xff);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x1b, (k_val_reg >> 0) & 0xff);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x1c, n_val);
 	if (ret < 0)
 		goto err;

 	if (priv->cfg->clock >= 28000000) {
 		ret = fc2580_wr_reg(priv, 0x4b, 0x22);
 		if (ret < 0)
 			goto err;
 	}

 	if (fc2580_pll_lut[i].band == 0x00) {
 		if (c->frequency <= 794000000)
 			tmp_val = 0x9f;
 		else
 			tmp_val = 0x8f;

 		ret = fc2580_wr_reg(priv, 0x2d, tmp_val);
 		if (ret < 0)
 			goto err;
 	}

 	/* registers */
 	for (i = 0; i < ARRAY_SIZE(fc2580_freq_regs_lut); i++) {
 		if (c->frequency <= fc2580_freq_regs_lut[i].freq)
 			break;
 	}

 	if (i == ARRAY_SIZE(fc2580_freq_regs_lut))
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x25, fc2580_freq_regs_lut[i].r25_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x27, fc2580_freq_regs_lut[i].r27_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x28, fc2580_freq_regs_lut[i].r28_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x29, fc2580_freq_regs_lut[i].r29_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x2b, fc2580_freq_regs_lut[i].r2b_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x2c, fc2580_freq_regs_lut[i].r2c_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x2d, fc2580_freq_regs_lut[i].r2d_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x30, fc2580_freq_regs_lut[i].r30_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x44, fc2580_freq_regs_lut[i].r44_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x50, fc2580_freq_regs_lut[i].r50_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x53, fc2580_freq_regs_lut[i].r53_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x5f, fc2580_freq_regs_lut[i].r5f_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x61, fc2580_freq_regs_lut[i].r61_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x62, fc2580_freq_regs_lut[i].r62_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x63, fc2580_freq_regs_lut[i].r63_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x67, fc2580_freq_regs_lut[i].r67_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x68, fc2580_freq_regs_lut[i].r68_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x69, fc2580_freq_regs_lut[i].r69_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6a, fc2580_freq_regs_lut[i].r6a_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6b, fc2580_freq_regs_lut[i].r6b_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6c, fc2580_freq_regs_lut[i].r6c_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6d, fc2580_freq_regs_lut[i].r6d_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6e, fc2580_freq_regs_lut[i].r6e_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg_ff(priv, 0x6f, fc2580_freq_regs_lut[i].r6f_val);
 	if (ret < 0)
 		goto err;

 	/* IF filters */
 	for (i = 0; i < ARRAY_SIZE(fc2580_if_filter_lut); i++) {
 		if (c->bandwidth_hz <= fc2580_if_filter_lut[i].freq)
 			break;
 	}

 	if (i == ARRAY_SIZE(fc2580_if_filter_lut))
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x36, fc2580_if_filter_lut[i].r36_val);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x37, 1UL * priv->cfg->clock * \
 			fc2580_if_filter_lut[i].mul / 1000000000);
 	if (ret < 0)
 		goto err;

 	ret = fc2580_wr_reg(priv, 0x39, fc2580_if_filter_lut[i].r39_val);
 	if (ret < 0)
 		goto err;

 	/* calibration? */
 	ret = fc2580_wr_reg(priv, 0x2e, 0x09);
 	if (ret < 0)
 		goto err;

 	for (i = 0; i < 5; i++) {
 		ret = fc2580_rd_reg(priv, 0x2f, &tmp_val);
 		if (ret < 0)
 			goto err;

 		/* done when [7:6] are set */
 		if ((tmp_val & 0xc0) == 0xc0)
 			break;

 		ret = fc2580_wr_reg(priv, 0x2e, 0x01);
 		if (ret < 0)
 			goto err;

 		ret = fc2580_wr_reg(priv, 0x2e, 0x09);
 		if (ret < 0)
 			goto err;

 		usleep_range(5000, 25000);
 	}

 	dev_dbg(&priv->i2c->dev, "%s: loop=%i\n", __func__, i);

 	ret = fc2580_wr_reg(priv, 0x2e, 0x01);
 	if (ret < 0)
 		goto err;

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

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

 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 	return ret;
 }

 static int fc2580_init(struct dvb_frontend *fe)
 {
 	struct fc2580_priv *priv = fe->tuner_priv;
 	int ret, i;

 	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

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

 	for (i = 0; i < ARRAY_SIZE(fc2580_init_reg_vals); i++) {
 		ret = fc2580_wr_reg(priv, fc2580_init_reg_vals[i].reg,
 				fc2580_init_reg_vals[i].val);
 		if (ret < 0)
 			goto err;
 	}

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

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

 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 	return ret;
 }

 static int fc2580_sleep(struct dvb_frontend *fe)
 {
 	struct fc2580_priv *priv = fe->tuner_priv;
 	int ret;

 	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

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

 	ret = fc2580_wr_reg(priv, 0x02, 0x0a);
 	if (ret < 0)
 		goto err;

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

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

 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 	return ret;
 }

 static int fc2580_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct fc2580_priv *priv = fe->tuner_priv;

 	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

 	*frequency = 0; /* Zero-IF */

 	return 0;
 }

 static int fc2580_release(struct dvb_frontend *fe)
 {
 	struct fc2580_priv *priv = fe->tuner_priv;

 	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

 	kfree(fe->tuner_priv);

 	return 0;
 }

 static const struct dvb_tuner_ops fc2580_tuner_ops = {
 	.info = {
 		.name           = "FCI FC2580",
 		.frequency_min  = 174000000,
 		.frequency_max  = 862000000,
 	},

 	.release = fc2580_release,

 	.init = fc2580_init,
 	.sleep = fc2580_sleep,
 	.set_params = fc2580_set_params,

 	.get_if_frequency = fc2580_get_if_frequency,
 };

 struct dvb_frontend *fc2580_attach(struct dvb_frontend *fe,
 		struct i2c_adapter *i2c, const struct fc2580_config *cfg)
 {
 	struct fc2580_priv *priv;
 	int ret;
 	u8 chip_id;

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

 	priv = kzalloc(sizeof(struct fc2580_priv), GFP_KERNEL);
 	if (!priv) {
 		ret = -ENOMEM;
 		dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
 		goto err;
 	}

 	priv->cfg = cfg;
 	priv->i2c = i2c;

 	/* check if the tuner is there */
 	ret = fc2580_rd_reg(priv, 0x01, &chip_id);
 	if (ret < 0)
 		goto err;

 	dev_dbg(&priv->i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);

 	switch (chip_id) {
 	case 0x56:
 	case 0x5a:
 		break;
 	default:
 		goto err;
 	}

 	dev_info(&priv->i2c->dev,
 			"%s: FCI FC2580 successfully identified\n",
 			KBUILD_MODNAME);

 	fe->tuner_priv = priv;
 	memcpy(&fe->ops.tuner_ops, &fc2580_tuner_ops,
 			sizeof(struct dvb_tuner_ops));

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

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

 	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
 	kfree(priv);
 	return NULL;
 }
 EXPORT_SYMBOL(fc2580_attach);

 MODULE_DESCRIPTION("FCI FC2580 silicon tuner driver");
 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 MODULE_LICENSE("GPL");
	/*
	* FCI FC2580 silicon tuner driver
	*
	* Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
	*
	* 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.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include "fc2580_priv.h"

	/*
	* TODO:
	* I2C write and read works only for one single register. Multiple registers
	* could not be accessed using normal register address auto-increment.
	* There could be (very likely) register to change that behavior....
	*
	* Due to that limitation functions:
	* fc2580_wr_regs()
	* fc2580_rd_regs()
	* could not be used for accessing more than one register at once.
	*
	* TODO:
	* Currently it blind writes bunch of static registers from the
	* fc2580_freq_regs_lut[] when fc2580_set_params() is called. Add some
	* logic to reduce unneeded register writes.
	*/

	/* write multiple registers */
	static int fc2580_wr_regs(struct fc2580_priv priv, u8 reg, u8 val, int len)
	{
	int ret;
	u8 buf[1 + len];
	struct i2c_msg msg[1] = {
	{
	.addr = priv->cfg->i2c_addr,
	.flags = 0,
	.len = sizeof(buf),
	.buf = buf,
	}
	};

	buf[0] = reg;
	memcpy(&buf[1], val, len);

	ret = i2c_transfer(priv->i2c, msg, 1);
	if (ret == 1) {
	ret = 0;
	} else {
	dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
	"len=%d\n", KBUILD_MODNAME, ret, reg, len);
	ret = -EREMOTEIO;
	}
	return ret;
	}

	/* read multiple registers */
	static int fc2580_rd_regs(struct fc2580_priv priv, u8 reg, u8 val, int len)
	{
	int ret;
	u8 buf[len];
	struct i2c_msg msg[2] = {
	{
	.addr = priv->cfg->i2c_addr,
	.flags = 0,
	.len = 1,
	.buf = &reg,
	}, {
	.addr = priv->cfg->i2c_addr,
	.flags = I2C_M_RD,
	.len = sizeof(buf),
	.buf = buf,
	}
	};

	ret = i2c_transfer(priv->i2c, msg, 2);
	if (ret == 2) {
	memcpy(val, buf, len);
	ret = 0;
	} else {
	dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
	"len=%d\n", KBUILD_MODNAME, ret, reg, len);
	ret = -EREMOTEIO;
	}

	return ret;
	}

	/* write single register */
	static int fc2580_wr_reg(struct fc2580_priv *priv, u8 reg, u8 val)
	{
	return fc2580_wr_regs(priv, reg, &val, 1);
	}

	/* read single register */
	static int fc2580_rd_reg(struct fc2580_priv priv, u8 reg, u8 val)
	{
	return fc2580_rd_regs(priv, reg, val, 1);
	}

	/* write single register conditionally only when value differs from 0xff
	* XXX: This is special routine meant only for writing fc2580_freq_regs_lut[]
	* values. Do not use for the other purposes. */
	static int fc2580_wr_reg_ff(struct fc2580_priv *priv, u8 reg, u8 val)
	{
	if (val == 0xff)
	return 0;
	else
	return fc2580_wr_regs(priv, reg, &val, 1);
	}

	static int fc2580_set_params(struct dvb_frontend *fe)
	{
	struct fc2580_priv *priv = fe->tuner_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	int ret = 0, i;
	unsigned int r_val, n_val, k_val, k_val_reg, f_ref;
	u8 tmp_val, r18_val;
	u64 f_vco;

	/*
	* Fractional-N synthesizer/PLL.
	* Most likely all those PLL calculations are not correct. I am not
	* sure, but it looks like it is divider based Fractional-N synthesizer.
	* There is divider for reference clock too?
	* Anyhow, synthesizer calculation results seems to be quite correct.
	*/

	dev_dbg(&priv->i2c->dev, "%s: delivery_system=%d frequency=%d " \
	"bandwidth_hz=%d\n", __func__,
	c->delivery_system, c->frequency, c->bandwidth_hz);

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

	/* PLL */
	for (i = 0; i < ARRAY_SIZE(fc2580_pll_lut); i++) {
	if (c->frequency <= fc2580_pll_lut[i].freq)
	break;
	}

	if (i == ARRAY_SIZE(fc2580_pll_lut))
	goto err;

	f_vco = c->frequency;
	f_vco *= fc2580_pll_lut[i].div;

	if (f_vco >= 2600000000UL)
	tmp_val = 0x0e \| fc2580_pll_lut[i].band;
	else
	tmp_val = 0x06 \| fc2580_pll_lut[i].band;

	ret = fc2580_wr_reg(priv, 0x02, tmp_val);
	if (ret < 0)
	goto err;

	if (f_vco >= 2UL * 76 * priv->cfg->clock) {
	r_val = 1;
	r18_val = 0x00;
	} else if (f_vco >= 1UL * 76 * priv->cfg->clock) {
	r_val = 2;
	r18_val = 0x10;
	} else {
	r_val = 4;
	r18_val = 0x20;
	}

	f_ref = 2UL * priv->cfg->clock / r_val;
	n_val = div_u64_rem(f_vco, f_ref, &k_val);
	k_val_reg = 1UL * k_val * (1 << 20) / f_ref;

	ret = fc2580_wr_reg(priv, 0x18, r18_val \| ((k_val_reg >> 16) & 0xff));
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x1a, (k_val_reg >> 8) & 0xff);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x1b, (k_val_reg >> 0) & 0xff);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x1c, n_val);
	if (ret < 0)
	goto err;

	if (priv->cfg->clock >= 28000000) {
	ret = fc2580_wr_reg(priv, 0x4b, 0x22);
	if (ret < 0)
	goto err;
	}

	if (fc2580_pll_lut[i].band == 0x00) {
	if (c->frequency <= 794000000)
	tmp_val = 0x9f;
	else
	tmp_val = 0x8f;

	ret = fc2580_wr_reg(priv, 0x2d, tmp_val);
	if (ret < 0)
	goto err;
	}

	/* registers */
	for (i = 0; i < ARRAY_SIZE(fc2580_freq_regs_lut); i++) {
	if (c->frequency <= fc2580_freq_regs_lut[i].freq)
	break;
	}

	if (i == ARRAY_SIZE(fc2580_freq_regs_lut))
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x25, fc2580_freq_regs_lut[i].r25_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x27, fc2580_freq_regs_lut[i].r27_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x28, fc2580_freq_regs_lut[i].r28_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x29, fc2580_freq_regs_lut[i].r29_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x2b, fc2580_freq_regs_lut[i].r2b_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x2c, fc2580_freq_regs_lut[i].r2c_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x2d, fc2580_freq_regs_lut[i].r2d_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x30, fc2580_freq_regs_lut[i].r30_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x44, fc2580_freq_regs_lut[i].r44_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x50, fc2580_freq_regs_lut[i].r50_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x53, fc2580_freq_regs_lut[i].r53_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x5f, fc2580_freq_regs_lut[i].r5f_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x61, fc2580_freq_regs_lut[i].r61_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x62, fc2580_freq_regs_lut[i].r62_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x63, fc2580_freq_regs_lut[i].r63_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x67, fc2580_freq_regs_lut[i].r67_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x68, fc2580_freq_regs_lut[i].r68_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x69, fc2580_freq_regs_lut[i].r69_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6a, fc2580_freq_regs_lut[i].r6a_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6b, fc2580_freq_regs_lut[i].r6b_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6c, fc2580_freq_regs_lut[i].r6c_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6d, fc2580_freq_regs_lut[i].r6d_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6e, fc2580_freq_regs_lut[i].r6e_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg_ff(priv, 0x6f, fc2580_freq_regs_lut[i].r6f_val);
	if (ret < 0)
	goto err;

	/* IF filters */
	for (i = 0; i < ARRAY_SIZE(fc2580_if_filter_lut); i++) {
	if (c->bandwidth_hz <= fc2580_if_filter_lut[i].freq)
	break;
	}

	if (i == ARRAY_SIZE(fc2580_if_filter_lut))
	goto err;

	ret = fc2580_wr_reg(priv, 0x36, fc2580_if_filter_lut[i].r36_val);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x37, 1UL * priv->cfg->clock * \
	fc2580_if_filter_lut[i].mul / 1000000000);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x39, fc2580_if_filter_lut[i].r39_val);
	if (ret < 0)
	goto err;

	/* calibration? */
	ret = fc2580_wr_reg(priv, 0x2e, 0x09);
	if (ret < 0)
	goto err;

	for (i = 0; i < 5; i++) {
	ret = fc2580_rd_reg(priv, 0x2f, &tmp_val);
	if (ret < 0)
	goto err;

	/* done when [7:6] are set */
	if ((tmp_val & 0xc0) == 0xc0)
	break;

	ret = fc2580_wr_reg(priv, 0x2e, 0x01);
	if (ret < 0)
	goto err;

	ret = fc2580_wr_reg(priv, 0x2e, 0x09);
	if (ret < 0)
	goto err;

	usleep_range(5000, 25000);
	}

	dev_dbg(&priv->i2c->dev, "%s: loop=%i\n", __func__, i);

	ret = fc2580_wr_reg(priv, 0x2e, 0x01);
	if (ret < 0)
	goto err;

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

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

	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
	}

	static int fc2580_init(struct dvb_frontend *fe)
	{
	struct fc2580_priv *priv = fe->tuner_priv;
	int ret, i;

	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

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

	for (i = 0; i < ARRAY_SIZE(fc2580_init_reg_vals); i++) {
	ret = fc2580_wr_reg(priv, fc2580_init_reg_vals[i].reg,
	fc2580_init_reg_vals[i].val);
	if (ret < 0)
	goto err;
	}

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

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

	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
	}

	static int fc2580_sleep(struct dvb_frontend *fe)
	{
	struct fc2580_priv *priv = fe->tuner_priv;
	int ret;

	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

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

	ret = fc2580_wr_reg(priv, 0x02, 0x0a);
	if (ret < 0)
	goto err;

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

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

	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
	}

	static int fc2580_get_if_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct fc2580_priv *priv = fe->tuner_priv;

	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

	frequency = 0; / Zero-IF */

	return 0;
	}

	static int fc2580_release(struct dvb_frontend *fe)
	{
	struct fc2580_priv *priv = fe->tuner_priv;

	dev_dbg(&priv->i2c->dev, "%s:\n", __func__);

	kfree(fe->tuner_priv);

	return 0;
	}

	static const struct dvb_tuner_ops fc2580_tuner_ops = {
	.info = {
	.name = "FCI FC2580",
	.frequency_min = 174000000,
	.frequency_max = 862000000,
	},

	.release = fc2580_release,

	.init = fc2580_init,
	.sleep = fc2580_sleep,
	.set_params = fc2580_set_params,

	.get_if_frequency = fc2580_get_if_frequency,
	};

	struct dvb_frontend fc2580_attach(struct dvb_frontend fe,
	struct i2c_adapter i2c, const struct fc2580_config cfg)
	{
	struct fc2580_priv *priv;
	int ret;
	u8 chip_id;

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

	priv = kzalloc(sizeof(struct fc2580_priv), GFP_KERNEL);
	if (!priv) {
	ret = -ENOMEM;
	dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
	goto err;
	}

	priv->cfg = cfg;
	priv->i2c = i2c;

	/* check if the tuner is there */
	ret = fc2580_rd_reg(priv, 0x01, &chip_id);
	if (ret < 0)
	goto err;

	dev_dbg(&priv->i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);

	switch (chip_id) {
	case 0x56:
	case 0x5a:
	break;
	default:
	goto err;
	}

	dev_info(&priv->i2c->dev,
	"%s: FCI FC2580 successfully identified\n",
	KBUILD_MODNAME);

	fe->tuner_priv = priv;
	memcpy(&fe->ops.tuner_ops, &fc2580_tuner_ops,
	sizeof(struct dvb_tuner_ops));

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

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

	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
	kfree(priv);
	return NULL;
	}
	EXPORT_SYMBOL(fc2580_attach);

	MODULE_DESCRIPTION("FCI FC2580 silicon tuner driver");
	MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
	MODULE_LICENSE("GPL");