drivers/media/dvb-frontends/stv6110x.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
 	STV6110(A) Silicon tuner driver

 	Copyright (C) Manu Abraham <abraham.manu@gmail.com>

 	Copyright (C) ST Microelectronics

 */

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

 #include <media/dvb_frontend.h>

 #include "stv6110x_reg.h"
 #include "stv6110x.h"
 #include "stv6110x_priv.h"

 /* Max transfer size done by I2C transfer functions */
 #define MAX_XFER_SIZE  64

 static unsigned int verbose;
 module_param(verbose, int, 0644);
 MODULE_PARM_DESC(verbose, "Set Verbosity level");

 static int stv6110x_read_reg(struct stv6110x_state *stv6110x, u8 reg, u8 *data)
 {
 	int ret;
 	const struct stv6110x_config *config = stv6110x->config;
 	u8 b0[] = { reg };
 	u8 b1[] = { 0 };
 	struct i2c_msg msg[] = {
 		{ .addr = config->addr, .flags = 0,	   .buf = b0, .len = 1 },
 		{ .addr = config->addr, .flags = I2C_M_RD, .buf = b1, .len = 1 }
 	};

 	ret = i2c_transfer(stv6110x->i2c, msg, 2);
 	if (ret != 2) {
 		dprintk(FE_ERROR, 1, "I/O Error");
 		return -EREMOTEIO;
 	}
 	*data = b1[0];

 	return 0;
 }

 static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 data[], int len)
 {
 	int ret;
 	const struct stv6110x_config *config = stv6110x->config;
 	u8 buf[MAX_XFER_SIZE];

 	struct i2c_msg msg = {
 		.addr = config->addr,
 		.flags = 0,
 		.buf = buf,
 		.len = len + 1
 	};

 	if (1 + len > sizeof(buf)) {
 		printk(KERN_WARNING
 		       "%s: i2c wr: len=%d is too big!\n",
 		       KBUILD_MODNAME, len);
 		return -EINVAL;
 	}

 	if (start + len > 8)
 		return -EINVAL;

 	buf[0] = start;
 	memcpy(&buf[1], data, len);

 	ret = i2c_transfer(stv6110x->i2c, &msg, 1);
 	if (ret != 1) {
 		dprintk(FE_ERROR, 1, "I/O Error");
 		return -EREMOTEIO;
 	}

 	return 0;
 }

 static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
 {
 	u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */

 	return stv6110x_write_regs(stv6110x, reg, &tmp, 1);
 }

 static int stv6110x_init(struct dvb_frontend *fe)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;
 	int ret;

 	ret = stv6110x_write_regs(stv6110x, 0, stv6110x->regs,
 				  ARRAY_SIZE(stv6110x->regs));
 	if (ret < 0) {
 		dprintk(FE_ERROR, 1, "Initialization failed");
 		return -1;
 	}

 	return 0;
 }

 static int stv6110x_set_frequency(struct dvb_frontend *fe, u32 frequency)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;
 	u32 rDiv, divider;
 	s32 pVal, pCalc, rDivOpt = 0, pCalcOpt = 1000;
 	u8 i;

 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_K, (REFCLOCK_MHz - 16));

 	if (frequency <= 1023000) {
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
 		pVal = 40;
 	} else if (frequency <= 1300000) {
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
 		pVal = 40;
 	} else if (frequency <= 2046000) {
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
 		pVal = 20;
 	} else {
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
 		pVal = 20;
 	}

 	for (rDiv = 0; rDiv <= 3; rDiv++) {
 		pCalc = (REFCLOCK_kHz / 100) / R_DIV(rDiv);

 		if ((abs((s32)(pCalc - pVal))) < (abs((s32)(pCalcOpt - pVal))))
 			rDivOpt = rDiv;

 		pCalcOpt = (REFCLOCK_kHz / 100) / R_DIV(rDivOpt);
 	}

 	divider = (frequency * R_DIV(rDivOpt) * pVal) / REFCLOCK_kHz;
 	divider = (divider + 5) / 10;

 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_R_DIV, rDivOpt);
 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_N_DIV_11_8, MSB(divider));
 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG0], TNG0_N_DIV_7_0, LSB(divider));

 	/* VCO Auto calibration */
 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALVCO_STRT, 1);

 	stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
 	stv6110x_write_reg(stv6110x, STV6110x_TNG1, stv6110x->regs[STV6110x_TNG1]);
 	stv6110x_write_reg(stv6110x, STV6110x_TNG0, stv6110x->regs[STV6110x_TNG0]);
 	stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);

 	for (i = 0; i < TRIALS; i++) {
 		stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
 		if (!STV6110x_GETFIELD(STAT1_CALVCO_STRT, stv6110x->regs[STV6110x_STAT1]))
 				break;
 		msleep(1);
 	}

 	return 0;
 }

 static int stv6110x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	stv6110x_read_reg(stv6110x, STV6110x_TNG1, &stv6110x->regs[STV6110x_TNG1]);
 	stv6110x_read_reg(stv6110x, STV6110x_TNG0, &stv6110x->regs[STV6110x_TNG0]);

 	*frequency = (MAKEWORD16(STV6110x_GETFIELD(TNG1_N_DIV_11_8, stv6110x->regs[STV6110x_TNG1]),
 				 STV6110x_GETFIELD(TNG0_N_DIV_7_0, stv6110x->regs[STV6110x_TNG0]))) * REFCLOCK_kHz;

 	*frequency /= (1 << (STV6110x_GETFIELD(TNG1_R_DIV, stv6110x->regs[STV6110x_TNG1]) +
 			     STV6110x_GETFIELD(TNG1_DIV4SEL, stv6110x->regs[STV6110x_TNG1])));

 	*frequency >>= 2;

 	return 0;
 }

 static int stv6110x_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;
 	u32 halfbw;
 	u8 i;

 	halfbw = bandwidth >> 1;

 	if (halfbw > 36000000)
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 31); /* LPF */
 	else if (halfbw < 5000000)
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 0); /* LPF */
 	else
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, ((halfbw / 1000000) - 5)); /* LPF */


 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x0); /* cal. clk activated */
 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALRC_STRT, 0x1); /* LPF auto cal */

 	stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
 	stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);

 	for (i = 0; i < TRIALS; i++) {
 		stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
 		if (!STV6110x_GETFIELD(STAT1_CALRC_STRT, stv6110x->regs[STV6110x_STAT1]))
 			break;
 		msleep(1);
 	}
 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x1); /* cal. done */
 	stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);

 	return 0;
 }

 static int stv6110x_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	stv6110x_read_reg(stv6110x, STV6110x_CTRL3, &stv6110x->regs[STV6110x_CTRL3]);
 	*bandwidth = (STV6110x_GETFIELD(CTRL3_CF, stv6110x->regs[STV6110x_CTRL3]) + 5) * 2000000;

 	return 0;
 }

 static int stv6110x_set_refclock(struct dvb_frontend *fe, u32 refclock)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	/* setup divider */
 	switch (refclock) {
 	default:
 	case 1:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
 		break;
 	case 2:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
 		break;
 	case 4:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
 		break;
 	case 8:
 	case 0:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
 		break;
 	}
 	stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);

 	return 0;
 }

 static int stv6110x_get_bbgain(struct dvb_frontend *fe, u32 *gain)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	stv6110x_read_reg(stv6110x, STV6110x_CTRL2, &stv6110x->regs[STV6110x_CTRL2]);
 	*gain = 2 * STV6110x_GETFIELD(CTRL2_BBGAIN, stv6110x->regs[STV6110x_CTRL2]);

 	return 0;
 }

 static int stv6110x_set_bbgain(struct dvb_frontend *fe, u32 gain)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_BBGAIN, gain / 2);
 	stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);

 	return 0;
 }

 static int stv6110x_set_mode(struct dvb_frontend *fe, enum tuner_mode mode)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;
 	int ret;

 	switch (mode) {
 	case TUNER_SLEEP:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 0);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 0);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 0);
 		break;

 	case TUNER_WAKE:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 1);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 1);
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 1);
 		break;
 	}

 	ret = stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
 	if (ret < 0) {
 		dprintk(FE_ERROR, 1, "I/O Error");
 		return -EIO;
 	}

 	return 0;
 }

 static int stv6110x_sleep(struct dvb_frontend *fe)
 {
 	if (fe->tuner_priv)
 		return stv6110x_set_mode(fe, TUNER_SLEEP);

 	return 0;
 }

 static int stv6110x_get_status(struct dvb_frontend *fe, u32 *status)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);

 	if (STV6110x_GETFIELD(STAT1_LOCK, stv6110x->regs[STV6110x_STAT1]))
 		*status = TUNER_PHASELOCKED;
 	else
 		*status = 0;

 	return 0;
 }


 static void stv6110x_release(struct dvb_frontend *fe)
 {
 	struct stv6110x_state *stv6110x = fe->tuner_priv;

 	fe->tuner_priv = NULL;
 	kfree(stv6110x);
 }

 static void st6110x_init_regs(struct stv6110x_state *stv6110x)
 {
 	u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};

 	memcpy(stv6110x->regs, default_regs, 8);
 }

 static void stv6110x_setup_divider(struct stv6110x_state *stv6110x)
 {
 	switch (stv6110x->config->clk_div) {
 	default:
 	case 1:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
 				  CTRL2_CO_DIV,
 				  0);
 		break;
 	case 2:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
 				  CTRL2_CO_DIV,
 				  1);
 		break;
 	case 4:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
 				  CTRL2_CO_DIV,
 				  2);
 		break;
 	case 8:
 	case 0:
 		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
 				  CTRL2_CO_DIV,
 				  3);
 		break;
 	}
 }

 static const struct dvb_tuner_ops stv6110x_ops = {
 	.info = {
 		.name		  = "STV6110(A) Silicon Tuner",
 		.frequency_min_hz =  950 * MHz,
 		.frequency_max_hz = 2150 * MHz,
 	},
 	.release		= stv6110x_release
 };

 static struct stv6110x_devctl stv6110x_ctl = {
 	.tuner_init		= stv6110x_init,
 	.tuner_sleep		= stv6110x_sleep,
 	.tuner_set_mode		= stv6110x_set_mode,
 	.tuner_set_frequency	= stv6110x_set_frequency,
 	.tuner_get_frequency	= stv6110x_get_frequency,
 	.tuner_set_bandwidth	= stv6110x_set_bandwidth,
 	.tuner_get_bandwidth	= stv6110x_get_bandwidth,
 	.tuner_set_bbgain	= stv6110x_set_bbgain,
 	.tuner_get_bbgain	= stv6110x_get_bbgain,
 	.tuner_set_refclk	= stv6110x_set_refclock,
 	.tuner_get_status	= stv6110x_get_status,
 };

 static void stv6110x_set_frontend_opts(struct stv6110x_state *stv6110x)
 {
 	stv6110x->frontend->tuner_priv		= stv6110x;
 	stv6110x->frontend->ops.tuner_ops	= stv6110x_ops;
 }

 static struct stv6110x_devctl *stv6110x_get_devctl(struct i2c_client *client)
 {
 	struct stv6110x_state *stv6110x = i2c_get_clientdata(client);

 	dev_dbg(&client->dev, "\n");

 	return stv6110x->devctl;
 }

 static int stv6110x_probe(struct i2c_client *client)
 {
 	struct stv6110x_config *config = client->dev.platform_data;

 	struct stv6110x_state *stv6110x;

 	stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
 	if (!stv6110x)
 		return -ENOMEM;

 	stv6110x->frontend	= config->frontend;
 	stv6110x->i2c		= client->adapter;
 	stv6110x->config	= config;
 	stv6110x->devctl	= &stv6110x_ctl;

 	st6110x_init_regs(stv6110x);
 	stv6110x_setup_divider(stv6110x);
 	stv6110x_set_frontend_opts(stv6110x);

 	dev_info(&stv6110x->i2c->dev, "Probed STV6110x\n");

 	i2c_set_clientdata(client, stv6110x);

 	/* setup callbacks */
 	config->get_devctl = stv6110x_get_devctl;

 	return 0;
 }

 static void stv6110x_remove(struct i2c_client *client)
 {
 	struct stv6110x_state *stv6110x = i2c_get_clientdata(client);

 	stv6110x_release(stv6110x->frontend);
 }

 const struct stv6110x_devctl *stv6110x_attach(struct dvb_frontend *fe,
 					const struct stv6110x_config *config,
 					struct i2c_adapter *i2c)
 {
 	struct stv6110x_state *stv6110x;

 	stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
 	if (!stv6110x)
 		return NULL;

 	stv6110x->frontend	= fe;
 	stv6110x->i2c		= i2c;
 	stv6110x->config	= config;
 	stv6110x->devctl	= &stv6110x_ctl;

 	st6110x_init_regs(stv6110x);
 	stv6110x_setup_divider(stv6110x);
 	stv6110x_set_frontend_opts(stv6110x);

 	fe->tuner_priv		= stv6110x;
 	fe->ops.tuner_ops	= stv6110x_ops;

 	dev_info(&stv6110x->i2c->dev, "Attaching STV6110x\n");
 	return stv6110x->devctl;
 }
 EXPORT_SYMBOL_GPL(stv6110x_attach);

 static const struct i2c_device_id stv6110x_id_table[] = {
 	{ "stv6110x" },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, stv6110x_id_table);

 static struct i2c_driver stv6110x_driver = {
 	.driver = {
 		.name	= "stv6110x",
 		.suppress_bind_attrs = true,
 	},
 	.probe		= stv6110x_probe,
 	.remove		= stv6110x_remove,
 	.id_table	= stv6110x_id_table,
 };

 module_i2c_driver(stv6110x_driver);

 MODULE_AUTHOR("Manu Abraham");
 MODULE_DESCRIPTION("STV6110x Silicon tuner");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	STV6110(A) Silicon tuner driver

	Copyright (C) Manu Abraham <abraham.manu@gmail.com>

	Copyright (C) ST Microelectronics

	*/

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

	#include <media/dvb_frontend.h>

	#include "stv6110x_reg.h"
	#include "stv6110x.h"
	#include "stv6110x_priv.h"

	/* Max transfer size done by I2C transfer functions */
	#define MAX_XFER_SIZE 64

	static unsigned int verbose;
	module_param(verbose, int, 0644);
	MODULE_PARM_DESC(verbose, "Set Verbosity level");

	static int stv6110x_read_reg(struct stv6110x_state stv6110x, u8 reg, u8 data)
	{
	int ret;
	const struct stv6110x_config *config = stv6110x->config;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {
	{ .addr = config->addr, .flags = 0, .buf = b0, .len = 1 },
	{ .addr = config->addr, .flags = I2C_M_RD, .buf = b1, .len = 1 }
	};

	ret = i2c_transfer(stv6110x->i2c, msg, 2);
	if (ret != 2) {
	dprintk(FE_ERROR, 1, "I/O Error");
	return -EREMOTEIO;
	}
	*data = b1[0];

	return 0;
	}

	static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 data[], int len)
	{
	int ret;
	const struct stv6110x_config *config = stv6110x->config;
	u8 buf[MAX_XFER_SIZE];

	struct i2c_msg msg = {
	.addr = config->addr,
	.flags = 0,
	.buf = buf,
	.len = len + 1
	};

	if (1 + len > sizeof(buf)) {
	printk(KERN_WARNING
	"%s: i2c wr: len=%d is too big!\n",
	KBUILD_MODNAME, len);
	return -EINVAL;
	}

	if (start + len > 8)
	return -EINVAL;

	buf[0] = start;
	memcpy(&buf[1], data, len);

	ret = i2c_transfer(stv6110x->i2c, &msg, 1);
	if (ret != 1) {
	dprintk(FE_ERROR, 1, "I/O Error");
	return -EREMOTEIO;
	}

	return 0;
	}

	static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
	{
	u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */

	return stv6110x_write_regs(stv6110x, reg, &tmp, 1);
	}

	static int stv6110x_init(struct dvb_frontend *fe)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;
	int ret;

	ret = stv6110x_write_regs(stv6110x, 0, stv6110x->regs,
	ARRAY_SIZE(stv6110x->regs));
	if (ret < 0) {
	dprintk(FE_ERROR, 1, "Initialization failed");
	return -1;
	}

	return 0;
	}

	static int stv6110x_set_frequency(struct dvb_frontend *fe, u32 frequency)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;
	u32 rDiv, divider;
	s32 pVal, pCalc, rDivOpt = 0, pCalcOpt = 1000;
	u8 i;

	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_K, (REFCLOCK_MHz - 16));

	if (frequency <= 1023000) {
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
	pVal = 40;
	} else if (frequency <= 1300000) {
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
	pVal = 40;
	} else if (frequency <= 2046000) {
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
	pVal = 20;
	} else {
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
	pVal = 20;
	}

	for (rDiv = 0; rDiv <= 3; rDiv++) {
	pCalc = (REFCLOCK_kHz / 100) / R_DIV(rDiv);

	if ((abs((s32)(pCalc - pVal))) < (abs((s32)(pCalcOpt - pVal))))
	rDivOpt = rDiv;

	pCalcOpt = (REFCLOCK_kHz / 100) / R_DIV(rDivOpt);
	}

	divider = (frequency * R_DIV(rDivOpt) * pVal) / REFCLOCK_kHz;
	divider = (divider + 5) / 10;

	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_R_DIV, rDivOpt);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_N_DIV_11_8, MSB(divider));
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG0], TNG0_N_DIV_7_0, LSB(divider));

	/* VCO Auto calibration */
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALVCO_STRT, 1);

	stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
	stv6110x_write_reg(stv6110x, STV6110x_TNG1, stv6110x->regs[STV6110x_TNG1]);
	stv6110x_write_reg(stv6110x, STV6110x_TNG0, stv6110x->regs[STV6110x_TNG0]);
	stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);

	for (i = 0; i < TRIALS; i++) {
	stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
	if (!STV6110x_GETFIELD(STAT1_CALVCO_STRT, stv6110x->regs[STV6110x_STAT1]))
	break;
	msleep(1);
	}

	return 0;
	}

	static int stv6110x_get_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	stv6110x_read_reg(stv6110x, STV6110x_TNG1, &stv6110x->regs[STV6110x_TNG1]);
	stv6110x_read_reg(stv6110x, STV6110x_TNG0, &stv6110x->regs[STV6110x_TNG0]);

	*frequency = (MAKEWORD16(STV6110x_GETFIELD(TNG1_N_DIV_11_8, stv6110x->regs[STV6110x_TNG1]),
	STV6110x_GETFIELD(TNG0_N_DIV_7_0, stv6110x->regs[STV6110x_TNG0]))) * REFCLOCK_kHz;

	*frequency /= (1 << (STV6110x_GETFIELD(TNG1_R_DIV, stv6110x->regs[STV6110x_TNG1]) +
	STV6110x_GETFIELD(TNG1_DIV4SEL, stv6110x->regs[STV6110x_TNG1])));

	*frequency >>= 2;

	return 0;
	}

	static int stv6110x_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;
	u32 halfbw;
	u8 i;

	halfbw = bandwidth >> 1;

	if (halfbw > 36000000)
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 31); /* LPF */
	else if (halfbw < 5000000)
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 0); /* LPF */
	else
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, ((halfbw / 1000000) - 5)); /* LPF */


	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x0); /* cal. clk activated */
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALRC_STRT, 0x1); /* LPF auto cal */

	stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
	stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);

	for (i = 0; i < TRIALS; i++) {
	stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
	if (!STV6110x_GETFIELD(STAT1_CALRC_STRT, stv6110x->regs[STV6110x_STAT1]))
	break;
	msleep(1);
	}
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x1); /* cal. done */
	stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);

	return 0;
	}

	static int stv6110x_get_bandwidth(struct dvb_frontend fe, u32 bandwidth)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	stv6110x_read_reg(stv6110x, STV6110x_CTRL3, &stv6110x->regs[STV6110x_CTRL3]);
	bandwidth = (STV6110x_GETFIELD(CTRL3_CF, stv6110x->regs[STV6110x_CTRL3]) + 5) 2000000;

	return 0;
	}

	static int stv6110x_set_refclock(struct dvb_frontend *fe, u32 refclock)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	/* setup divider */
	switch (refclock) {
	default:
	case 1:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
	break;
	case 2:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
	break;
	case 4:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
	break;
	case 8:
	case 0:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
	break;
	}
	stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);

	return 0;
	}

	static int stv6110x_get_bbgain(struct dvb_frontend fe, u32 gain)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	stv6110x_read_reg(stv6110x, STV6110x_CTRL2, &stv6110x->regs[STV6110x_CTRL2]);
	gain = 2 STV6110x_GETFIELD(CTRL2_BBGAIN, stv6110x->regs[STV6110x_CTRL2]);

	return 0;
	}

	static int stv6110x_set_bbgain(struct dvb_frontend *fe, u32 gain)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_BBGAIN, gain / 2);
	stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);

	return 0;
	}

	static int stv6110x_set_mode(struct dvb_frontend *fe, enum tuner_mode mode)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;
	int ret;

	switch (mode) {
	case TUNER_SLEEP:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 0);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 0);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 0);
	break;

	case TUNER_WAKE:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 1);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 1);
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 1);
	break;
	}

	ret = stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
	if (ret < 0) {
	dprintk(FE_ERROR, 1, "I/O Error");
	return -EIO;
	}

	return 0;
	}

	static int stv6110x_sleep(struct dvb_frontend *fe)
	{
	if (fe->tuner_priv)
	return stv6110x_set_mode(fe, TUNER_SLEEP);

	return 0;
	}

	static int stv6110x_get_status(struct dvb_frontend fe, u32 status)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);

	if (STV6110x_GETFIELD(STAT1_LOCK, stv6110x->regs[STV6110x_STAT1]))
	*status = TUNER_PHASELOCKED;
	else
	*status = 0;

	return 0;
	}


	static void stv6110x_release(struct dvb_frontend *fe)
	{
	struct stv6110x_state *stv6110x = fe->tuner_priv;

	fe->tuner_priv = NULL;
	kfree(stv6110x);
	}

	static void st6110x_init_regs(struct stv6110x_state *stv6110x)
	{
	u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};

	memcpy(stv6110x->regs, default_regs, 8);
	}

	static void stv6110x_setup_divider(struct stv6110x_state *stv6110x)
	{
	switch (stv6110x->config->clk_div) {
	default:
	case 1:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
	CTRL2_CO_DIV,
	0);
	break;
	case 2:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
	CTRL2_CO_DIV,
	1);
	break;
	case 4:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
	CTRL2_CO_DIV,
	2);
	break;
	case 8:
	case 0:
	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
	CTRL2_CO_DIV,
	3);
	break;
	}
	}

	static const struct dvb_tuner_ops stv6110x_ops = {
	.info = {
	.name = "STV6110(A) Silicon Tuner",
	.frequency_min_hz = 950 * MHz,
	.frequency_max_hz = 2150 * MHz,
	},
	.release = stv6110x_release
	};

	static struct stv6110x_devctl stv6110x_ctl = {
	.tuner_init = stv6110x_init,
	.tuner_sleep = stv6110x_sleep,
	.tuner_set_mode = stv6110x_set_mode,
	.tuner_set_frequency = stv6110x_set_frequency,
	.tuner_get_frequency = stv6110x_get_frequency,
	.tuner_set_bandwidth = stv6110x_set_bandwidth,
	.tuner_get_bandwidth = stv6110x_get_bandwidth,
	.tuner_set_bbgain = stv6110x_set_bbgain,
	.tuner_get_bbgain = stv6110x_get_bbgain,
	.tuner_set_refclk = stv6110x_set_refclock,
	.tuner_get_status = stv6110x_get_status,
	};

	static void stv6110x_set_frontend_opts(struct stv6110x_state *stv6110x)
	{
	stv6110x->frontend->tuner_priv = stv6110x;
	stv6110x->frontend->ops.tuner_ops = stv6110x_ops;
	}

	static struct stv6110x_devctl stv6110x_get_devctl(struct i2c_client client)
	{
	struct stv6110x_state *stv6110x = i2c_get_clientdata(client);

	dev_dbg(&client->dev, "\n");

	return stv6110x->devctl;
	}

	static int stv6110x_probe(struct i2c_client *client)
	{
	struct stv6110x_config *config = client->dev.platform_data;

	struct stv6110x_state *stv6110x;

	stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
	if (!stv6110x)
	return -ENOMEM;

	stv6110x->frontend = config->frontend;
	stv6110x->i2c = client->adapter;
	stv6110x->config = config;
	stv6110x->devctl = &stv6110x_ctl;

	st6110x_init_regs(stv6110x);
	stv6110x_setup_divider(stv6110x);
	stv6110x_set_frontend_opts(stv6110x);

	dev_info(&stv6110x->i2c->dev, "Probed STV6110x\n");

	i2c_set_clientdata(client, stv6110x);

	/* setup callbacks */
	config->get_devctl = stv6110x_get_devctl;

	return 0;
	}

	static void stv6110x_remove(struct i2c_client *client)
	{
	struct stv6110x_state *stv6110x = i2c_get_clientdata(client);

	stv6110x_release(stv6110x->frontend);
	}

	const struct stv6110x_devctl stv6110x_attach(struct dvb_frontend fe,
	const struct stv6110x_config *config,
	struct i2c_adapter *i2c)
	{
	struct stv6110x_state *stv6110x;

	stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
	if (!stv6110x)
	return NULL;

	stv6110x->frontend = fe;
	stv6110x->i2c = i2c;
	stv6110x->config = config;
	stv6110x->devctl = &stv6110x_ctl;

	st6110x_init_regs(stv6110x);
	stv6110x_setup_divider(stv6110x);
	stv6110x_set_frontend_opts(stv6110x);

	fe->tuner_priv = stv6110x;
	fe->ops.tuner_ops = stv6110x_ops;

	dev_info(&stv6110x->i2c->dev, "Attaching STV6110x\n");
	return stv6110x->devctl;
	}
	EXPORT_SYMBOL_GPL(stv6110x_attach);

	static const struct i2c_device_id stv6110x_id_table[] = {
	{ "stv6110x" },
	{}
	};
	MODULE_DEVICE_TABLE(i2c, stv6110x_id_table);

	static struct i2c_driver stv6110x_driver = {
	.driver = {
	.name = "stv6110x",
	.suppress_bind_attrs = true,
	},
	.probe = stv6110x_probe,
	.remove = stv6110x_remove,
	.id_table = stv6110x_id_table,
	};

	module_i2c_driver(stv6110x_driver);

	MODULE_AUTHOR("Manu Abraham");
	MODULE_DESCRIPTION("STV6110x Silicon tuner");
	MODULE_LICENSE("GPL");