drivers/media/dvb-frontends/stb0899_drv.c

/*
	STB0899 Multistandard Frontend driver
	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	Copyright (C) ST Microelectronics

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

#include <linux/dvb/frontend.h>
#include "dvb_frontend.h"

#include "stb0899_drv.h"
#include "stb0899_priv.h"
#include "stb0899_reg.h"

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

static unsigned int verbose = 0;//1;
module_param(verbose, int, 0644);

/* C/N in dB/10, NIRM/NIRL */
static const struct stb0899_tab stb0899_cn_tab[] = {
	{ 200,	2600 },
	{ 190,	2700 },
	{ 180,	2860 },
	{ 170,	3020 },
	{ 160,	3210 },
	{ 150,	3440 },
	{ 140,	3710 },
	{ 130,	4010 },
	{ 120,	4360 },
	{ 110,	4740 },
	{ 100,	5190 },
	{ 90,	5670 },
	{ 80,	6200 },
	{ 70,	6770 },
	{ 60,	7360 },
	{ 50,	7970 },
	{ 40,	8250 },
	{ 30,	9000 },
	{ 20,	9450 },
	{ 15,	9600 },
};

/* DVB-S AGCIQ_VALUE vs. signal level in dBm/10.
 * As measured, connected to a modulator.
 * -8.0 to -50.0 dBm directly connected,
 * -52.0 to -74.8 with extra attenuation.
 * Cut-off to AGCIQ_VALUE = 0x80 below -74.8dBm.
 * Crude linear extrapolation below -84.8dBm and above -8.0dBm.
 */
static const struct stb0899_tab stb0899_dvbsrf_tab[] = {
	{ -750,	-128 },
	{ -748,	 -94 },
	{ -745,	 -92 },
	{ -735,	 -90 },
	{ -720,	 -87 },
	{ -670,	 -77 },
	{ -640,	 -70 },
	{ -610,	 -62 },
	{ -600,	 -60 },
	{ -590,	 -56 },
	{ -560,	 -41 },
	{ -540,	 -25 },
	{ -530,	 -17 },
	{ -520,	 -11 },
	{ -500,	   1 },
	{ -490,	   6 },
	{ -480,	  10 },
	{ -440,	  22 },
	{ -420,	  27 },
	{ -400,	  31 },
	{ -380,	  34 },
	{ -340,	  40 },
	{ -320,	  43 },
	{ -280,	  48 },
	{ -250,	  52 },
	{ -230,	  55 },
	{ -180,	  61 },
	{ -140,	  66 },
	{  -90,	  73 },
	{  -80,	  74 },
	{  500,	 127 }
};

/* DVB-S2 IF_AGC_GAIN vs. signal level in dBm/10.
 * As measured, connected to a modulator.
 * -8.0 to -50.1 dBm directly connected,
 * -53.0 to -76.6 with extra attenuation.
 * Cut-off to IF_AGC_GAIN = 0x3fff below -76.6dBm.
 * Crude linear extrapolation below -76.6dBm and above -8.0dBm.
 */
static const struct stb0899_tab stb0899_dvbs2rf_tab[] = {
	{  700,	    0 },
	{  -80,	 3217 },
	{ -150,	 3893 },
	{ -190,	 4217 },
	{ -240,	 4621 },
	{ -280,	 4945 },
	{ -320,	 5273 },
	{ -350,	 5545 },
	{ -370,	 5741 },
	{ -410,	 6147 },
	{ -450,	 6671 },
	{ -490,	 7413 },
	{ -501,	 7665 },
	{ -530,	 8767 },
	{ -560,	10219 },
	{ -580,	10939 },
	{ -590,	11518 },
	{ -600,	11723 },
	{ -650,	12659 },
	{ -690,	13219 },
	{ -730,	13645 },
	{ -750,	13909 },
	{ -766,	14153 },
	{ -950,	16383 }
};

/* DVB-S2 Es/N0 quant in dB/100 vs read value * 100*/
static struct stb0899_tab stb0899_quant_tab[] = {
	{    0,	    0 },
	{    0,	  100 },
	{  600,	  200 },
	{  950,	  299 },
	{ 1200,	  398 },
	{ 1400,	  501 },
	{ 1560,	  603 },
	{ 1690,	  700 },
	{ 1810,	  804 },
	{ 1910,	  902 },
	{ 2000,	 1000 },
	{ 2080,	 1096 },
	{ 2160,	 1202 },
	{ 2230,	 1303 },
	{ 2350,	 1496 },
	{ 2410,	 1603 },
	{ 2460,	 1698 },
	{ 2510,	 1799 },
	{ 2600,	 1995 },
	{ 2650,	 2113 },
	{ 2690,  2213 },
	{ 2720,	 2291 },
	{ 2760,	 2399 },
	{ 2800,	 2512 },
	{ 2860,	 2692 },
	{ 2930,	 2917 },
	{ 2960,	 3020 },
	{ 3010,	 3199 },
	{ 3040,	 3311 },
	{ 3060,	 3388 },
	{ 3120,	 3631 },
	{ 3190,	 3936 },
	{ 3400,	 5012 },
	{ 3610,	 6383 },
	{ 3800,	 7943 },
	{ 4210,	12735 },
	{ 4500,	17783 },
	{ 4690,	22131 },
	{ 4810,	25410 }
};

/* DVB-S2 Es/N0 estimate in dB/100 vs read value */
static struct stb0899_tab stb0899_est_tab[] = {
	{    0,	     0 },
	{    0,	     1 },
	{  301,	     2 },
	{ 1204,	    16 },
	{ 1806,	    64 },
	{ 2408,	   256 },
	{ 2709,	   512 },
	{ 3010,	  1023 },
	{ 3311,	  2046 },
	{ 3612,	  4093 },
	{ 3823,	  6653 },
	{ 3913,	  8185 },
	{ 4010,	 10233 },
	{ 4107,	 12794 },
	{ 4214,	 16368 },
	{ 4266,	 18450 },
	{ 4311,	 20464 },
	{ 4353,	 22542 },
	{ 4391,	 24604 },
	{ 4425,	 26607 },
	{ 4457,	 28642 },
	{ 4487,	 30690 },
	{ 4515,	 32734 },
	{ 4612,	 40926 },
	{ 4692,	 49204 },
	{ 4816,	 65464 },
	{ 4913,	 81846 },
	{ 4993,	 98401 },
	{ 5060,	114815 },
	{ 5118,	131220 },
	{ 5200,	158489 },
	{ 5300,	199526 },
	{ 5400,	251189 },
	{ 5500,	316228 },
	{ 5600,	398107 },
	{ 5720,	524807 },
	{ 5721,	526017 },
};

static int _stb0899_read_reg(struct stb0899_state *state, unsigned int reg)
{
	int ret;

	u8 b0[] = { reg >> 8, reg & 0xff };
	u8 buf;

	struct i2c_msg msg[] = {
		{
			.addr	= state->config->demod_address,
			.flags	= 0,
			.buf	= b0,
			.len	= 2
		},{
			.addr	= state->config->demod_address,
			.flags	= I2C_M_RD,
			.buf	= &buf,
			.len	= 1
		}
	};

	ret = i2c_transfer(state->i2c, msg, 2);
	if (ret != 2) {
		if (ret != -ERESTARTSYS)
			dprintk(state->verbose, FE_ERROR, 1,
				"Read error, Reg=[0x%02x], Status=%d",
				reg, ret);

		return ret < 0 ? ret : -EREMOTEIO;
	}
	if (unlikely(*state->verbose >= FE_DEBUGREG))
		dprintk(state->verbose, FE_ERROR, 1, "Reg=[0x%02x], data=%02x",
			reg, buf);

	return (unsigned int)buf;
}

int stb0899_read_reg(struct stb0899_state *state, unsigned int reg)
{
	int result;

	result = _stb0899_read_reg(state, reg);
	/*
	 * Bug ID 9:
	 * access to 0xf2xx/0xf6xx
	 * must be followed by read from 0xf2ff/0xf6ff.
	 */
	if ((reg != 0xf2ff) && (reg != 0xf6ff) &&
	    (((reg & 0xff00) == 0xf200) || ((reg & 0xff00) == 0xf600)))
		_stb0899_read_reg(state, (reg | 0x00ff));

	return result;
}

u32 _stb0899_read_s2reg(struct stb0899_state *state,
			u32 stb0899_i2cdev,
			u32 stb0899_base_addr,
			u16 stb0899_reg_offset)
{
	int status;
	u32 data;
	u8 buf[7] = { 0 };
	u16 tmpaddr;

	u8 buf_0[] = {
		GETBYTE(stb0899_i2cdev, BYTE1),		/* 0xf3	S2 Base Address (MSB)	*/
		GETBYTE(stb0899_i2cdev, BYTE0),		/* 0xfc	S2 Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE0),	/* 0x00	Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE1),	/* 0x04	Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE2),	/* 0x00	Base Address (MSB)	*/
		GETBYTE(stb0899_base_addr, BYTE3),	/* 0x00	Base Address (MSB)	*/
	};
	u8 buf_1[] = {
		0x00,	/* 0xf3	Reg Offset	*/
		0x00,	/* 0x44	Reg Offset	*/
	};

	struct i2c_msg msg_0 = {
		.addr	= state->config->demod_address,
		.flags	= 0,
		.buf	= buf_0,
		.len	= 6
	};

	struct i2c_msg msg_1 = {
		.addr	= state->config->demod_address,
		.flags	= 0,
		.buf	= buf_1,
		.len	= 2
	};

	struct i2c_msg msg_r = {
		.addr	= state->config->demod_address,
		.flags	= I2C_M_RD,
		.buf	= buf,
		.len	= 4
	};

	tmpaddr = stb0899_reg_offset & 0xff00;
	if (!(stb0899_reg_offset & 0x8))
		tmpaddr = stb0899_reg_offset | 0x20;

	buf_1[0] = GETBYTE(tmpaddr, BYTE1);
	buf_1[1] = GETBYTE(tmpaddr, BYTE0);

	status = i2c_transfer(state->i2c, &msg_0, 1);
	if (status < 1) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s ERR(1), Device=[0x%04x], Base address=[0x%08x], Offset=[0x%04x], Status=%d\n",
			       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, status);

		goto err;
	}

	/* Dummy	*/
	status = i2c_transfer(state->i2c, &msg_1, 1);
	if (status < 1)
		goto err;

	status = i2c_transfer(state->i2c, &msg_r, 1);
	if (status < 1)
		goto err;

	buf_1[0] = GETBYTE(stb0899_reg_offset, BYTE1);
	buf_1[1] = GETBYTE(stb0899_reg_offset, BYTE0);

	/* Actual	*/
	status = i2c_transfer(state->i2c, &msg_1, 1);
	if (status < 1) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s ERR(2), Device=[0x%04x], Base address=[0x%08x], Offset=[0x%04x], Status=%d\n",
			       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, status);
		goto err;
	}

	status = i2c_transfer(state->i2c, &msg_r, 1);
	if (status < 1) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s ERR(3), Device=[0x%04x], Base address=[0x%08x], Offset=[0x%04x], Status=%d\n",
			       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, status);
		return status < 0 ? status : -EREMOTEIO;
	}

	data = MAKEWORD32(buf[3], buf[2], buf[1], buf[0]);
	if (unlikely(*state->verbose >= FE_DEBUGREG))
		printk(KERN_DEBUG "%s Device=[0x%04x], Base address=[0x%08x], Offset=[0x%04x], Data=[0x%08x]\n",
		       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, data);

	return data;

err:
	return status < 0 ? status : -EREMOTEIO;
}

int stb0899_write_s2reg(struct stb0899_state *state,
			u32 stb0899_i2cdev,
			u32 stb0899_base_addr,
			u16 stb0899_reg_offset,
			u32 stb0899_data)
{
	int status;

	/* Base Address Setup	*/
	u8 buf_0[] = {
		GETBYTE(stb0899_i2cdev, BYTE1),		/* 0xf3	S2 Base Address (MSB)	*/
		GETBYTE(stb0899_i2cdev, BYTE0),		/* 0xfc	S2 Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE0),	/* 0x00	Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE1),	/* 0x04	Base Address (LSB)	*/
		GETBYTE(stb0899_base_addr, BYTE2),	/* 0x00	Base Address (MSB)	*/
		GETBYTE(stb0899_base_addr, BYTE3),	/* 0x00	Base Address (MSB)	*/
	};
	u8 buf_1[] = {
		0x00,	/* 0xf3	Reg Offset	*/
		0x00,	/* 0x44	Reg Offset	*/
		0x00,	/* data			*/
		0x00,	/* data			*/
		0x00,	/* data			*/
		0x00,	/* data			*/
	};

	struct i2c_msg msg_0 = {
		.addr	= state->config->demod_address,
		.flags	= 0,
		.buf	= buf_0,
		.len	= 6
	};

	struct i2c_msg msg_1 = {
		.addr	= state->config->demod_address,
		.flags	= 0,
		.buf	= buf_1,
		.len	= 6
	};

	buf_1[0] = GETBYTE(stb0899_reg_offset, BYTE1);
	buf_1[1] = GETBYTE(stb0899_reg_offset, BYTE0);
	buf_1[2] = GETBYTE(stb0899_data, BYTE0);
	buf_1[3] = GETBYTE(stb0899_data, BYTE1);
	buf_1[4] = GETBYTE(stb0899_data, BYTE2);
	buf_1[5] = GETBYTE(stb0899_data, BYTE3);

	if (unlikely(*state->verbose >= FE_DEBUGREG))
		printk(KERN_DEBUG "%s Device=[0x%04x], Base Address=[0x%08x], Offset=[0x%04x], Data=[0x%08x]\n",
		       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, stb0899_data);

	status = i2c_transfer(state->i2c, &msg_0, 1);
	if (unlikely(status < 1)) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s ERR (1), Device=[0x%04x], Base Address=[0x%08x], Offset=[0x%04x], Data=[0x%08x], status=%d\n",
			       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, stb0899_data, status);
		goto err;
	}
	status = i2c_transfer(state->i2c, &msg_1, 1);
	if (unlikely(status < 1)) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s ERR (2), Device=[0x%04x], Base Address=[0x%08x], Offset=[0x%04x], Data=[0x%08x], status=%d\n",
			       __func__, stb0899_i2cdev, stb0899_base_addr, stb0899_reg_offset, stb0899_data, status);

		return status < 0 ? status : -EREMOTEIO;
	}

	return 0;

err:
	return status < 0 ? status : -EREMOTEIO;
}

int stb0899_read_regs(struct stb0899_state *state, unsigned int reg, u8 *buf, u32 count)
{
	int status;

	u8 b0[] = { reg >> 8, reg & 0xff };

	struct i2c_msg msg[] = {
		{
			.addr	= state->config->demod_address,
			.flags	= 0,
			.buf	= b0,
			.len	= 2
		},{
			.addr	= state->config->demod_address,
			.flags	= I2C_M_RD,
			.buf	= buf,
			.len	= count
		}
	};

	status = i2c_transfer(state->i2c, msg, 2);
	if (status != 2) {
		if (status != -ERESTARTSYS)
			printk(KERN_ERR "%s Read error, Reg=[0x%04x], Count=%u, Status=%d\n",
			       __func__, reg, count, status);
		goto err;
	}
	/*
	 * Bug ID 9:
	 * access to 0xf2xx/0xf6xx
	 * must be followed by read from 0xf2ff/0xf6ff.
	 */
	if ((reg != 0xf2ff) && (reg != 0xf6ff) &&
	    (((reg & 0xff00) == 0xf200) || ((reg & 0xff00) == 0xf600)))
		_stb0899_read_reg(state, (reg | 0x00ff));

	dprintk(state->verbose, FE_DEBUGREG, 1,
		"%s [0x%04x]: %*ph", __func__, reg, count, buf);

	return 0;
err:
	return status < 0 ? status : -EREMOTEIO;
}

int stb0899_write_regs(struct stb0899_state *state, unsigned int reg, u8 *data, u32 count)
{
	int ret;
	u8 buf[MAX_XFER_SIZE];
	struct i2c_msg i2c_msg = {
		.addr	= state->config->demod_address,
		.flags	= 0,
		.buf	= buf,
		.len	= 2 + count
	};

	if (2 + count > sizeof(buf)) {
		printk(KERN_WARNING
		       "%s: i2c wr reg=%04x: len=%d is too big!\n",
		       KBUILD_MODNAME, reg, count);
		return -EINVAL;
	}

	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;
	memcpy(&buf[2], data, count);

	dprintk(state->verbose, FE_DEBUGREG, 1,
		"%s [0x%04x]: %*ph", __func__, reg, count, data);
	ret = i2c_transfer(state->i2c, &i2c_msg, 1);

	/*
	 * Bug ID 9:
	 * access to 0xf2xx/0xf6xx
	 * must be followed by read from 0xf2ff/0xf6ff.
	 */
	if ((((reg & 0xff00) == 0xf200) || ((reg & 0xff00) == 0xf600)))
		stb0899_read_reg(state, (reg | 0x00ff));

	if (ret != 1) {
		if (ret != -ERESTARTSYS)
			dprintk(state->verbose, FE_ERROR, 1, "Reg=[0x%04x], Data=[0x%02x ...], Count=%u, Status=%d",
				reg, data[0], count, ret);
		return ret < 0 ? ret : -EREMOTEIO;
	}

	return 0;
}

int stb0899_write_reg(struct stb0899_state *state, unsigned int reg, u8 data)
{
	u8 tmp = data;
	return stb0899_write_regs(state, reg, &tmp, 1);
}

/*
 * stb0899_get_mclk
 * Get STB0899 master clock frequency
 * ExtClk: external clock frequency (Hz)
 */
static u32 stb0899_get_mclk(struct stb0899_state *state)
{
	u32 mclk = 0, div = 0;

	div = stb0899_read_reg(state, STB0899_NCOARSE);
	mclk = (div + 1) * state->config->xtal_freq / 6;
	dprintk(state->verbose, FE_DEBUG, 1, "div=%d, mclk=%d", div, mclk);

	return mclk;
}

/*
 * stb0899_set_mclk
 * Set STB0899 master Clock frequency
 * Mclk: demodulator master clock
 * ExtClk: external clock frequency (Hz)
 */
static void stb0899_set_mclk(struct stb0899_state *state, u32 Mclk)
{
	struct stb0899_internal *internal = &state->internal;
	u8 mdiv = 0;

	dprintk(state->verbose, FE_DEBUG, 1, "state->config=%p", state->config);
	mdiv = ((6 * Mclk) / state->config->xtal_freq) - 1;
	dprintk(state->verbose, FE_DEBUG, 1, "mdiv=%d", mdiv);

	stb0899_write_reg(state, STB0899_NCOARSE, mdiv);
	internal->master_clk = stb0899_get_mclk(state);

	dprintk(state->verbose, FE_DEBUG, 1, "MasterCLOCK=%d", internal->master_clk);
}

static int stb0899_postproc(struct stb0899_state *state, u8 ctl, int enable)
{
	struct stb0899_config *config		= state->config;
	const struct stb0899_postproc *postproc	= config->postproc;

	/* post process event */
	if (postproc) {
		if (enable) {
			if (postproc[ctl].level == STB0899_GPIOPULLUP)
				stb0899_write_reg(state, postproc[ctl].gpio, 0x02);
			else
				stb0899_write_reg(state, postproc[ctl].gpio, 0x82);
		} else {
			if (postproc[ctl].level == STB0899_GPIOPULLUP)
				stb0899_write_reg(state, postproc[ctl].gpio, 0x82);
			else
				stb0899_write_reg(state, postproc[ctl].gpio, 0x02);
		}
	}
	return 0;
}

static void stb0899_detach(struct dvb_frontend *fe)
{
	struct stb0899_state *state = fe->demodulator_priv;

	/* post process event */
	stb0899_postproc(state, STB0899_POSTPROC_GPIO_POWER, 0);
}

static void stb0899_release(struct dvb_frontend *fe)
{
	struct stb0899_state *state = fe->demodulator_priv;

	dprintk(state->verbose, FE_DEBUG, 1, "Release Frontend");
	kfree(state);
}

/*
 * stb0899_get_alpha
 * return: rolloff
 */
static int stb0899_get_alpha(struct stb0899_state *state)
{
	u8 mode_coeff;

	mode_coeff = stb0899_read_reg(state, STB0899_DEMOD);

	if (STB0899_GETFIELD(MODECOEFF, mode_coeff) == 1)
		return 20;
	else
		return 35;
}

/*
 * stb0899_init_calc
 */
static void stb0899_init_calc(struct stb0899_state *state)
{
	struct stb0899_internal *internal = &state->internal;
	int master_clk;
	u8 agc[2];
	u32 reg;

	/* Read registers (in burst mode)	*/
	stb0899_read_regs(state, STB0899_AGC1REF, agc, 2); /* AGC1R and AGC2O	*/

	/* Initial calculations	*/
	master_clk			= stb0899_get_mclk(state);
	internal->t_agc1		= 0;
	internal->t_agc2		= 0;
	internal->master_clk		= master_clk;
	internal->mclk			= master_clk / 65536L;
	internal->rolloff		= stb0899_get_alpha(state);

	/* DVBS2 Initial calculations	*/
	/* Set AGC value to the middle	*/
	internal->agc_gain		= 8154;
	reg = STB0899_READ_S2REG(STB0899_S2DEMOD, IF_AGC_CNTRL);
	STB0899_SETFIELD_VAL(IF_GAIN_INIT, reg, internal->agc_gain);
	stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_IF_AGC_CNTRL, STB0899_OFF0_IF_AGC_CNTRL, reg);

	reg = STB0899_READ_S2REG(STB0899_S2DEMOD, RRC_ALPHA);
	internal->rrc_alpha		= STB0899_GETFIELD(RRC_ALPHA, reg);

	internal->center_freq		= 0;
	internal->av_frame_coarse	= 10;
	internal->av_frame_fine		= 20;
	internal->step_size		= 2;
/*
	if ((pParams->SpectralInv == FE_IQ_NORMAL) || (pParams->SpectralInv == FE_IQ_AUTO))
		pParams->IQLocked = 0;
	else
		pParams->IQLocked = 1;
*/
}

static int stb0899_wait_diseqc_fifo_empty(struct stb0899_state *state, int timeout)
{
	u8 reg = 0;
	unsigned long start = jiffies;

	while (1) {
		reg = stb0899_read_reg(state, STB0899_DISSTATUS);
		if (!STB0899_GETFIELD(FIFOFULL, reg))
			break;
		if (time_after(jiffies, start + timeout)) {
			dprintk(state->verbose, FE_ERROR, 1, "timed out !!");
			return -ETIMEDOUT;
		}
	}

	return 0;
}

static int stb0899_send_diseqc_msg(struct dvb_frontend *fe, struct dvb_diseqc_master_cmd *cmd)
{
	struct stb0899_state *state = fe->demodulator_priv;
	u8 reg, i;

	if (cmd->msg_len > sizeof(cmd->msg))
		return -EINVAL;

	/* enable FIFO precharge	*/
	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	STB0899_SETFIELD_VAL(DISPRECHARGE, reg, 1);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);
	for (i = 0; i < cmd->msg_len; i++) {
		/* wait for FIFO empty	*/
		if (stb0899_wait_diseqc_fifo_empty(state, 100) < 0)
			return -ETIMEDOUT;

		stb0899_write_reg(state, STB0899_DISFIFO, cmd->msg[i]);
	}
	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	STB0899_SETFIELD_VAL(DISPRECHARGE, reg, 0);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);
	msleep(100);
	return 0;
}

static int stb0899_wait_diseqc_rxidle(struct stb0899_state *state, int timeout)
{
	u8 reg = 0;
	unsigned long start = jiffies;

	while (!STB0899_GETFIELD(RXEND, reg)) {
		reg = stb0899_read_reg(state, STB0899_DISRX_ST0);
		if (time_after(jiffies, start + timeout)) {
			dprintk(state->verbose, FE_ERROR, 1, "timed out!!");
			return -ETIMEDOUT;
		}
		msleep(10);
	}

	return 0;
}

static int stb0899_recv_slave_reply(struct dvb_frontend *fe, struct dvb_diseqc_slave_reply *reply)
{
	struct stb0899_state *state = fe->demodulator_priv;
	u8 reg, length = 0, i;
	int result;

	if (stb0899_wait_diseqc_rxidle(state, 100) < 0)
		return -ETIMEDOUT;

	reg = stb0899_read_reg(state, STB0899_DISRX_ST0);
	if (STB0899_GETFIELD(RXEND, reg)) {

		reg = stb0899_read_reg(state, STB0899_DISRX_ST1);
		length = STB0899_GETFIELD(FIFOBYTENBR, reg);

		if (length > sizeof (reply->msg)) {
			result = -EOVERFLOW;
			goto exit;
		}
		reply->msg_len = length;

		/* extract data */
		for (i = 0; i < length; i++)
			reply->msg[i] = stb0899_read_reg(state, STB0899_DISFIFO);
	}

	return 0;
exit:

	return result;
}

static int stb0899_wait_diseqc_txidle(struct stb0899_state *state, int timeout)
{
	u8 reg = 0;
	unsigned long start = jiffies;

	while (!STB0899_GETFIELD(TXIDLE, reg)) {
		reg = stb0899_read_reg(state, STB0899_DISSTATUS);
		if (time_after(jiffies, start + timeout)) {
			dprintk(state->verbose, FE_ERROR, 1, "timed out!!");
			return -ETIMEDOUT;
		}
		msleep(10);
	}
	return 0;
}

static int stb0899_send_diseqc_burst(struct dvb_frontend *fe,
				     enum fe_sec_mini_cmd burst)
{
	struct stb0899_state *state = fe->demodulator_priv;
	u8 reg, old_state;

	/* wait for diseqc idle	*/
	if (stb0899_wait_diseqc_txidle(state, 100) < 0)
		return -ETIMEDOUT;

	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	old_state = reg;
	/* set to burst mode	*/
	STB0899_SETFIELD_VAL(DISEQCMODE, reg, 0x03);
	STB0899_SETFIELD_VAL(DISPRECHARGE, reg, 0x01);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);
	switch (burst) {
	case SEC_MINI_A:
		/* unmodulated	*/
		stb0899_write_reg(state, STB0899_DISFIFO, 0x00);
		break;
	case SEC_MINI_B:
		/* modulated	*/
		stb0899_write_reg(state, STB0899_DISFIFO, 0xff);
		break;
	}
	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	STB0899_SETFIELD_VAL(DISPRECHARGE, reg, 0x00);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);
	/* wait for diseqc idle	*/
	if (stb0899_wait_diseqc_txidle(state, 100) < 0)
		return -ETIMEDOUT;

	/* restore state	*/
	stb0899_write_reg(state, STB0899_DISCNTRL1, old_state);

	return 0;
}

static int stb0899_diseqc_init(struct stb0899_state *state)
{
/*
	struct dvb_diseqc_slave_reply rx_data;
*/
	u8 f22_tx, reg;

	u32 mclk, tx_freq = 22000;/* count = 0, i; */
	reg = stb0899_read_reg(state, STB0899_DISCNTRL2);
	STB0899_SETFIELD_VAL(ONECHIP_TRX, reg, 0);
	stb0899_write_reg(state, STB0899_DISCNTRL2, reg);

	/* disable Tx spy	*/
	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	STB0899_SETFIELD_VAL(DISEQCRESET, reg, 1);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);

	reg = stb0899_read_reg(state, STB0899_DISCNTRL1);
	STB0899_SETFIELD_VAL(DISEQCRESET, reg, 0);
	stb0899_write_reg(state, STB0899_DISCNTRL1, reg);

	mclk = stb0899_get_mclk(state);
	f22_tx = mclk / (tx_freq * 32);
	stb0899_write_reg(state, STB0899_DISF22, f22_tx); /* DiSEqC Tx freq	*/
	state->rx_freq = 20000;

	return 0;
}

static int stb0899_sleep(struct dvb_frontend *fe)
{
	struct stb0899_state *state = fe->demodulator_priv;
/*
	u8 reg;
*/
	dprintk(state->verbose, FE_DEBUG, 1, "Going to Sleep .. (Really tired .. :-))");
	/* post process event */
	stb0899_postproc(state, STB0899_POSTPROC_GPIO_POWER, 0);

	return 0;
}

static int stb0899_wakeup(struct dvb_frontend *fe)
{
	int rc;
	struct stb0899_state *state = fe->demodulator_priv;

	if ((rc = stb0899_write_reg(state, STB0899_SYNTCTRL, STB0899_SELOSCI)))
		return rc;
	/* Activate all clocks; DVB-S2 registers are inaccessible otherwise. */
	if ((rc = stb0899_write_reg(state, STB0899_STOPCLK1, 0x00)))
		return rc;
	if ((rc = stb0899_write_reg(state, STB0899_STOPCLK2, 0x00)))
		return rc;

	/* post process event */
	stb0899_postproc(state, STB0899_POSTPROC_GPIO_POWER, 1);

	return 0;
}

static int stb0899_init(struct dvb_frontend *fe)
{
	int i;
	struct stb0899_state *state = fe->demodulator_priv;
	struct stb0899_config *config = state->config;

	dprintk(state->verbose, FE_DEBUG, 1, "Initializing STB0899 ... ");

	/* init device		*/
	dprintk(state->verbose, FE_DEBUG, 1, "init device");
	for (i = 0; config->init_dev[i].address != 0xffff; i++)
		stb0899_write_reg(state, config->init_dev[i].address, config->init_dev[i].data);

	dprintk(state->verbose, FE_DEBUG, 1, "init S2 demod");
	/* init S2 demod	*/
	for (i = 0; config->init_s2_demod[i].offset != 0xffff; i++)
		stb0899_write_s2reg(state, STB0899_S2DEMOD,
				    config->init_s2_demod[i].base_address,
				    config->init_s2_demod[i].offset,
				    config->init_s2_demod[i].data);

	dprintk(state->verbose, FE_DEBUG, 1, "init S1 demod");
	/* init S1 demod	*/
	for (i = 0; config->init_s1_demod[i].address != 0xffff; i++)
		stb0899_write_reg(state, config->init_s1_demod[i].address, config->init_s1_demod[i].data);

	dprintk(state->verbose, FE_DEBUG, 1, "init S2 FEC");
	/* init S2 fec		*/
	for (i = 0; config->init_s2_fec[i].offset != 0xffff; i++)
		stb0899_write_s2reg(state, STB0899_S2FEC,
				    config->init_s2_fec[i].base_address,
				    config->init_s2_fec[i].offset,
				    config->init_s2_fec[i].data);

	dprintk(state->verbose, FE_DEBUG, 1, "init TST");
	/* init test		*/
	for (i = 0; config->init_tst[i].address != 0xffff; i++)
		stb0899_write_reg(state, config->init_tst[i].address, config->init_tst[i].data);

	stb0899_init_calc(state);
	stb0899_diseqc_init(state);

	return 0;
}

static int stb0899_table_lookup(const struct stb0899_tab *tab, int max, int val)
{
	int res = 0;
	int min = 0, med;

	if (val < tab[min].read)
		res = tab[min].real;
	else if (val >= tab[max].read)
		res = tab[max].real;
	else {
		while ((max - min) > 1) {
			med = (max + min) / 2;
			if (val >= tab[min].read && val < tab[med].read)
				max = med;
			else
				min = med;
		}
		res = ((val - tab[min].read) *
		       (tab[max].real - tab[min].real) /
		       (tab[max].read - tab[min].read)) +
			tab[min].real;
	}

	return res;
}

static int stb0899_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
	struct stb0899_state *state		= fe->demodulator_priv;
	struct stb0899_internal *internal	= &state->internal;

	int val;
	u32 reg;
	*strength = 0;
	switch (state->delsys) {
	case SYS_DVBS:
	case SYS_DSS:
		if (internal->lock) {
			reg  = stb0899_read_reg(state, STB0899_VSTATUS);
			if (STB0899_GETFIELD(VSTATUS_LOCKEDVIT, reg)) {

				reg = stb0899_read_reg(state, STB0899_AGCIQIN);
				val = (s32)(s8)STB0899_GETFIELD(AGCIQVALUE, reg);

				*strength = stb0899_table_lookup(stb0899_dvbsrf_tab, ARRAY_SIZE(stb0899_dvbsrf_tab) - 1, val);
				*strength += 750;
				dprintk(state->verbose, FE_DEBUG, 1, "AGCIQVALUE = 0x%02x, C = %d * 0.1 dBm",
					val & 0xff, *strength);
			}
		}
		break;
	case SYS_DVBS2:
		if (internal->lock) {
			reg = STB0899_READ_S2REG(STB0899_S2DEMOD, IF_AGC_GAIN);
			val = STB0899_GETFIELD(IF_AGC_GAIN, reg);

			*strength = stb0899_table_lookup(stb0899_dvbs2rf_tab, ARRAY_SIZE(stb0899_dvbs2rf_tab) - 1, val);
			*strength += 950;
			dprintk(state->verbose, FE_DEBUG, 1, "IF_AGC_GAIN = 0x%04x, C = %d * 0.1 dBm",
				val & 0x3fff, *strength);
		}
		break;
	default:
		dprintk(state->verbose, FE_DEBUG, 1, "Unsupported delivery system");
		return -EINVAL;
	}

	return 0;
}

static int stb0899_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct stb0899_state *state		= fe->demodulator_priv;
	struct stb0899_internal *internal	= &state->internal;

	unsigned int val, quant, quantn = -1, est, estn = -1;
	u8 buf[2];
	u32 reg;

	*snr = 0;
	reg  = stb0899_read_reg(state, STB0899_VSTATUS);
	switch (state->delsys) {
	case SYS_DVBS:
	case SYS_DSS:
		if (internal->lock) {
			if (STB0899_GETFIELD(VSTATUS_LOCKEDVIT, reg)) {

				stb0899_read_regs(state, STB0899_NIRM, buf, 2);
				val = MAKEWORD16(buf[0], buf[1]);

				*snr = stb0899_table_lookup(stb0899_cn_tab, ARRAY_SIZE(stb0899_cn_tab) - 1, val);
				dprintk(state->verbose, FE_DEBUG, 1, "NIR = 0x%02x%02x = %u, C/N = %d * 0.1 dBm\n",
					buf[0], buf[1], val, *snr);
			}
		}
		break;
	case SYS_DVBS2:
		if (internal->lock) {
			reg = STB0899_READ_S2REG(STB0899_S2DEMOD, UWP_CNTRL1);
			quant = STB0899_GETFIELD(UWP_ESN0_QUANT, reg);
			reg = STB0899_READ_S2REG(STB0899_S2DEMOD, UWP_STAT2);
			est = STB0899_GETFIELD(ESN0_EST, reg);
			if (est == 1)
				val = 301; /* C/N = 30.1 dB */
			else if (est == 2)
				val = 270; /* C/N = 27.0 dB */
			else {
				/* quantn = 100 * log(quant^2) */
				quantn = stb0899_table_lookup(stb0899_quant_tab, ARRAY_SIZE(stb0899_quant_tab) - 1, quant * 100);
				/* estn = 100 * log(est) */
				estn = stb0899_table_lookup(stb0899_est_tab, ARRAY_SIZE(stb0899_est_tab) - 1, est);
				/* snr(dBm/10) = -10*(log(est)-log(quant^2)) => snr(dBm/10) = (100*log(quant^2)-100*log(est))/10 */
				val = (quantn - estn) / 10;
			}
			*snr = val;
			dprintk(state->verbose, FE_DEBUG, 1, "Es/N0 quant = %d (%d) estimate = %u (%d), C/N = %d * 0.1 dBm",
				quant, quantn, est, estn, val);
		}
		break;
	default:
		dprintk(state->verbose, FE_DEBUG, 1, "Unsupported delivery system");
		return -EINVAL;
	}

	return 0;
}

static int stb0899_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
	struct stb0899_state *state		= fe->demodulator_priv;
	struct stb0899_internal *internal	= &state->internal;
	u8 reg;
	*status = 0;

	switch (state->delsys) {
	case SYS_DVBS:
	case SYS_DSS:
		dprintk(state->verbose, FE_DEBUG, 1, "Delivery system DVB-S/DSS");
		if (internal->lock) {
			reg  = stb0899_read_reg(state, STB0899_VSTATUS);
			if (STB0899_GETFIELD(VSTATUS_LOCKEDVIT, reg)) {
				dprintk(state->verbose, FE_DEBUG, 1, "--------> FE_HAS_CARRIER | FE_HAS_LOCK");
				*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;

				reg = stb0899_read_reg(state, STB0899_PLPARM);
				if (STB0899_GETFIELD(VITCURPUN, reg)) {
					dprintk(state->verbose, FE_DEBUG, 1, "--------> FE_HAS_VITERBI | FE_HAS_SYNC");
					*status |= FE_HAS_VITERBI | FE_HAS_SYNC;
					/* post process event */
					stb0899_postproc(state, STB0899_POSTPROC_GPIO_LOCK, 1);
				}
			}
		}
		break;
	case SYS_DVBS2:
		dprintk(state->verbose, FE_DEBUG, 1, "Delivery system DVB-S2");
		if (internal->lock) {
			reg = STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_STAT2);
			if (STB0899_GETFIELD(UWP_LOCK, reg) && STB0899_GETFIELD(CSM_LOCK, reg)) {
				*status |= FE_HAS_CARRIER;
				dprintk(state->verbose, FE_DEBUG, 1,
					"UWP & CSM Lock ! ---> DVB-S2 FE_HAS_CARRIER");

				reg = stb0899_read_reg(state, STB0899_CFGPDELSTATUS1);
				if (STB0899_GETFIELD(CFGPDELSTATUS_LOCK, reg)) {
					*status |= FE_HAS_LOCK;
					dprintk(state->verbose, FE_DEBUG, 1,
						"Packet Delineator Locked ! -----> DVB-S2 FE_HAS_LOCK");

				}
				if (STB0899_GETFIELD(CONTINUOUS_STREAM, reg)) {
					*status |= FE_HAS_VITERBI;
					dprintk(state->verbose, FE_DEBUG, 1,
						"Packet Delineator found VITERBI ! -----> DVB-S2 FE_HAS_VITERBI");
				}
				if (STB0899_GETFIELD(ACCEPTED_STREAM, reg)) {
					*status |= FE_HAS_SYNC;
					dprintk(state->verbose, FE_DEBUG, 1,
						"Packet Delineator found SYNC ! -----> DVB-S2 FE_HAS_SYNC");
					/* post process event */
					stb0899_postproc(state, STB0899_POSTPROC_GPIO_LOCK, 1);
				}
			}
		}
		break;
	default:
		dprintk(state->verbose, FE_DEBUG, 1, "Unsupported delivery system");
		return -EINVAL;
	}
	return 0;
}

/*
 * stb0899_get_error
 * viterbi error for DVB-S/DSS
 * packet error for DVB-S2
 * Bit Error Rate or Packet Error Rate * 10 ^ 7
 */
static int stb0899_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct stb0899_state *state		= fe->demodulator_priv;
	struct stb0899_internal *internal	= &state->internal;

	u8  lsb, msb;

	*ber = 0;

	switch (state->delsys) {
	case SYS_DVBS:
	case SYS_DSS:
		if (internal->lock) {
			lsb = stb0899_read_reg(state, STB0899_ECNT1L);
			msb = stb0899_read_reg(state, STB0899_ECNT1M);
			*ber = MAKEWORD16(msb, lsb);
			/* Viterbi Check	*/
			if (STB0899_GETFIELD(VSTATUS_PRFVIT, internal->v_status)) {
				/* Error Rate		*/
				*ber *= 9766;
				/* ber = ber * 10 ^ 7	*/
				*ber /= (-1 + (1 << (2 * STB0899_GETFIELD(NOE, internal->err_ctrl))));
				*ber /= 8;
			}
		}
		break;
	case SYS_DVBS2:
		if (internal->lock) {
			lsb = stb0899_read_reg(state, STB0899_ECNT1L);
			msb = stb0899_read_reg(state, STB0899_ECNT1M);
			*ber = MAKEWORD16(msb, lsb);
			/* ber = ber * 10 ^ 7	*/
			*ber *= 10000000;
			*ber /= (-1 + (1 << (4 + 2 * STB0899_GETFIELD(NOE, internal->err_ctrl))));
		}
		break;
	default:
		dprintk(state->verbose, FE_DEBUG, 1, "Unsupported delivery system");
		return -EINVAL;
	}

	return 0;
}

static int stb0899_set_voltage(struct dvb_frontend *fe,
			       enum fe_sec_voltage voltage)
{
	struct stb0899_state *state = fe->demodulator_priv;

	switch (voltage) {
	case SEC_VOLTAGE_13:
		stb0899_write_reg(state, STB0899_GPIO00CFG, 0x82);
		stb0899_write_reg(state, STB0899_GPIO01CFG, 0x02);
		stb0899_write_reg(state, STB0899_GPIO02CFG, 0x00);
		break;
	case SEC_VOLTAGE_18:
		stb0899_write_reg(state, STB0899_GPIO00CFG, 0x02);
		stb0899_write_reg(state, STB0899_GPIO01CFG, 0x02);
		stb0899_write_reg(state, STB0899_GPIO02CFG, 0x82);
		break;
	case SEC_VOLTAGE_OFF:
		stb0899_write_reg(state, STB0899_GPIO00CFG, 0x82);
		stb0899_write_reg(state, STB0899_GPIO01CFG, 0x82);
		stb0899_write_reg(state, STB0899_GPIO02CFG, 0x82);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int stb0899_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone)
{
	struct stb0899_state *state = fe->demodulator_priv;
	struct stb0899_internal *internal = &state->internal;

	u8 div, reg;

	/* wait for diseqc idle	*/
	if (stb0899_wait_diseqc_txidle(state, 100) < 0)
		return -ETIMEDOUT;

	switch (tone) {
	case SEC_TONE_ON:
		div = (internal->master_clk / 100) / 5632;
		div = (div + 5) / 10;
		stb0899_write_reg(state, STB0899_DISEQCOCFG, 0x66);
		reg = stb0899_read_reg(state, STB0899_ACRPRESC);
		STB0899_SETFIELD_VAL(ACRPRESC, reg, 0x03);
		stb0899_write_reg(state, STB0899_ACRPRESC, reg);
		stb0899_write_reg(state, STB0899_ACRDIV1, div);
		break;
	case SEC_TONE_OFF:
		stb0899_write_reg(state, STB0899_DISEQCOCFG, 0x20);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

int stb0899_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
	int i2c_stat;
	struct stb0899_state *state = fe->demodulator_priv;

	i2c_stat = stb0899_read_reg(state, STB0899_I2CRPT);
	if (i2c_stat < 0)
		goto err;

	if (enable) {
		dprintk(state->verbose, FE_DEBUG, 1, "Enabling I2C Repeater ...");
		i2c_stat |=  STB0899_I2CTON;
		if (stb0899_write_reg(state, STB0899_I2CRPT, i2c_stat) < 0)
			goto err;
	} else {
		dprintk(state->verbose, FE_DEBUG, 1, "Disabling I2C Repeater ...");
		i2c_stat &= ~STB0899_I2CTON;
		if (stb0899_write_reg(state, STB0899_I2CRPT, i2c_stat) < 0)
			goto err;
	}
	return 0;
err:
	dprintk(state->verbose, FE_ERROR, 1, "I2C Repeater control failed");
	return -EREMOTEIO;
}


static inline void CONVERT32(u32 x, char *str)
{
	*str++	= (x >> 24) & 0xff;
	*str++	= (x >> 16) & 0xff;
	*str++	= (x >>  8) & 0xff;
	*str++	= (x >>  0) & 0xff;
	*str	= '\0';
}

static int stb0899_get_dev_id(struct stb0899_state *state)
{
	u8 chip_id, release;
	u16 id;
	u32 demod_ver = 0, fec_ver = 0;
	char demod_str[5] = { 0 };
	char fec_str[5] = { 0 };

	id = stb0899_read_reg(state, STB0899_DEV_ID);
	dprintk(state->verbose, FE_DEBUG, 1, "ID reg=[0x%02x]", id);
	chip_id = STB0899_GETFIELD(CHIP_ID, id);
	release = STB0899_GETFIELD(CHIP_REL, id);

	dprintk(state->verbose, FE_ERROR, 1, "Device ID=[%d], Release=[%d]",
		chip_id, release);

	CONVERT32(STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_CORE_ID), (char *)&demod_str);

	demod_ver = STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_VERSION_ID);
	dprintk(state->verbose, FE_ERROR, 1, "Demodulator Core ID=[%s], Version=[%d]", (char *) &demod_str, demod_ver);
	CONVERT32(STB0899_READ_S2REG(STB0899_S2FEC, FEC_CORE_ID_REG), (char *)&fec_str);
	fec_ver = STB0899_READ_S2REG(STB0899_S2FEC, FEC_VER_ID_REG);
	if (! (chip_id > 0)) {
		dprintk(state->verbose, FE_ERROR, 1, "couldn't find a STB 0899");

		return -ENODEV;
	}
	dprintk(state->verbose, FE_ERROR, 1, "FEC Core ID=[%s], Version=[%d]", (char*) &fec_str, fec_ver);

	return 0;
}

static void stb0899_set_delivery(struct stb0899_state *state)
{
	u8 reg;
	u8 stop_clk[2];

	stop_clk[0] = stb0899_read_reg(state, STB0899_STOPCLK1);
	stop_clk[1] = stb0899_read_reg(state, STB0899_STOPCLK2);

	switch (state->delsys) {
	case SYS_DVBS:
		dprintk(state->verbose, FE_DEBUG, 1, "Delivery System -- DVB-S");
		/* FECM/Viterbi ON	*/
		reg = stb0899_read_reg(state, STB0899_FECM);
		STB0899_SETFIELD_VAL(FECM_RSVD0, reg, 0);
		STB0899_SETFIELD_VAL(FECM_VITERBI_ON, reg, 1);
		stb0899_write_reg(state, STB0899_FECM, reg);

		stb0899_write_reg(state, STB0899_RSULC, 0xb1);
		stb0899_write_reg(state, STB0899_TSULC, 0x40);
		stb0899_write_reg(state, STB0899_RSLLC, 0x42);
		stb0899_write_reg(state, STB0899_TSLPL, 0x12);

		reg = stb0899_read_reg(state, STB0899_TSTRES);
		STB0899_SETFIELD_VAL(FRESLDPC, reg, 1);
		stb0899_write_reg(state, STB0899_TSTRES, reg);

		STB0899_SETFIELD_VAL(STOP_CHK8PSK, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKFEC108, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKFEC216, stop_clk[0], 1);

		STB0899_SETFIELD_VAL(STOP_CKPKDLIN108, stop_clk[1], 1);
		STB0899_SETFIELD_VAL(STOP_CKPKDLIN216, stop_clk[1], 1);

		STB0899_SETFIELD_VAL(STOP_CKINTBUF216, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKCORE216, stop_clk[0], 0);

		STB0899_SETFIELD_VAL(STOP_CKS2DMD108, stop_clk[1], 1);
		break;
	case SYS_DVBS2:
		/* FECM/Viterbi OFF	*/
		reg = stb0899_read_reg(state, STB0899_FECM);
		STB0899_SETFIELD_VAL(FECM_RSVD0, reg, 0);
		STB0899_SETFIELD_VAL(FECM_VITERBI_ON, reg, 0);
		stb0899_write_reg(state, STB0899_FECM, reg);

		stb0899_write_reg(state, STB0899_RSULC, 0xb1);
		stb0899_write_reg(state, STB0899_TSULC, 0x42);
		stb0899_write_reg(state, STB0899_RSLLC, 0x40);
		stb0899_write_reg(state, STB0899_TSLPL, 0x02);

		reg = stb0899_read_reg(state, STB0899_TSTRES);
		STB0899_SETFIELD_VAL(FRESLDPC, reg, 0);
		stb0899_write_reg(state, STB0899_TSTRES, reg);

		STB0899_SETFIELD_VAL(STOP_CHK8PSK, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKFEC108, stop_clk[0], 0);
		STB0899_SETFIELD_VAL(STOP_CKFEC216, stop_clk[0], 0);

		STB0899_SETFIELD_VAL(STOP_CKPKDLIN108, stop_clk[1], 0);
		STB0899_SETFIELD_VAL(STOP_CKPKDLIN216, stop_clk[1], 0);

		STB0899_SETFIELD_VAL(STOP_CKINTBUF216, stop_clk[0], 0);
		STB0899_SETFIELD_VAL(STOP_CKCORE216, stop_clk[0], 0);

		STB0899_SETFIELD_VAL(STOP_CKS2DMD108, stop_clk[1], 0);
		break;
	case SYS_DSS:
		/* FECM/Viterbi ON	*/
		reg = stb0899_read_reg(state, STB0899_FECM);
		STB0899_SETFIELD_VAL(FECM_RSVD0, reg, 1);
		STB0899_SETFIELD_VAL(FECM_VITERBI_ON, reg, 1);
		stb0899_write_reg(state, STB0899_FECM, reg);

		stb0899_write_reg(state, STB0899_RSULC, 0xa1);
		stb0899_write_reg(state, STB0899_TSULC, 0x61);
		stb0899_write_reg(state, STB0899_RSLLC, 0x42);

		reg = stb0899_read_reg(state, STB0899_TSTRES);
		STB0899_SETFIELD_VAL(FRESLDPC, reg, 1);
		stb0899_write_reg(state, STB0899_TSTRES, reg);

		STB0899_SETFIELD_VAL(STOP_CHK8PSK, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKFEC108, stop_clk[0], 1);
		STB0899_SETFIELD_VAL(STOP_CKFEC216, stop_clk[0], 1);

		STB0899_SETFIELD_VAL(STOP_CKPKDLIN108, stop_clk[1], 1);
		STB0899_SETFIELD_VAL(STOP_CKPKDLIN216, stop_clk[1], 1);

		STB0899_SETFIELD_VAL(STOP_CKCORE216, stop_clk[0], 0);

		STB0899_SETFIELD_VAL(STOP_CKS2DMD108, stop_clk[1], 1);
		break;
	default:
		dprintk(state->verbose, FE_ERROR, 1, "Unsupported delivery system");
		break;
	}
	STB0899_SETFIELD_VAL(STOP_CKADCI108, stop_clk[0], 0);
	stb0899_write_regs(state, STB0899_STOPCLK1, stop_clk, 2);
}

/*
 * stb0899_set_iterations
 * set the LDPC iteration scale function
 */
static void stb0899_set_iterations(struct stb0899_state *state)
{
	struct stb0899_internal *internal = &state->internal;
	struct stb0899_config *config = state->config;

	s32 iter_scale;
	u32 reg;

	iter_scale = 17 * (internal->master_clk / 1000);
	iter_scale += 410000;
	iter_scale /= (internal->srate / 1000000);
	iter_scale /= 1000;

	if (iter_scale > config->ldpc_max_iter)
		iter_scale = config->ldpc_max_iter;

	reg = STB0899_READ_S2REG(STB0899_S2FEC, MAX_ITER);
	STB0899_SETFIELD_VAL(MAX_ITERATIONS, reg, iter_scale);
	stb0899_write_s2reg(state, STB0899_S2FEC, STB0899_BASE_MAX_ITER, STB0899_OFF0_MAX_ITER, reg);
}

static enum dvbfe_search stb0899_search(struct dvb_frontend *fe)
{
	struct stb0899_state *state = fe->demodulator_priv;
	struct stb0899_params *i_params = &state->params;
	struct stb0899_internal *internal = &state->internal;
	struct stb0899_config *config = state->config;
	struct dtv_frontend_properties *props = &fe->dtv_property_cache;

	u32 SearchRange, gain;

	i_params->freq	= props->frequency;
	i_params->srate = props->symbol_rate;
	state->delsys = props->delivery_system;
	dprintk(state->verbose, FE_DEBUG, 1, "delivery system=%d", state->delsys);

	SearchRange = 10000000;
	dprintk(state->verbose, FE_DEBUG, 1, "Frequency=%d, Srate=%d", i_params->freq, i_params->srate);
	/* checking Search Range is meaningless for a fixed 3 Mhz			*/
	if (INRANGE(i_params->srate, 1000000, 45000000)) {
		dprintk(state->verbose, FE_DEBUG, 1, "Parameters IN RANGE");
		stb0899_set_delivery(state);

		if (state->config->tuner_set_rfsiggain) {
			if (internal->srate > 15000000)
				gain =  8; /* 15Mb < srate < 45Mb, gain = 8dB	*/
			else if (internal->srate > 5000000)
				gain = 12; /*  5Mb < srate < 15Mb, gain = 12dB	*/
			else
				gain = 14; /*  1Mb < srate <  5Mb, gain = 14db	*/
			state->config->tuner_set_rfsiggain(fe, gain);
		}

		if (i_params->srate <= 5000000)
			stb0899_set_mclk(state, config->lo_clk);
		else
			stb0899_set_mclk(state, config->hi_clk);

		switch (state->delsys) {
		case SYS_DVBS:
		case SYS_DSS:
			dprintk(state->verbose, FE_DEBUG, 1, "DVB-S delivery system");
			internal->freq	= i_params->freq;
			internal->srate	= i_params->srate;
			/*
			 * search = user search range +
			 *	    500Khz +
			 *	    2 * Tuner_step_size +
			 *	    10% of the symbol rate
			 */
			internal->srch_range	= SearchRange + 1500000 + (i_params->srate / 5);
			internal->derot_percent	= 30;

			/* What to do for tuners having no bandwidth setup ?	*/
			/* enable tuner I/O */
			stb0899_i2c_gate_ctrl(&state->frontend, 1);

			if (state->config->tuner_set_bandwidth)
				state->config->tuner_set_bandwidth(fe, (13 * (stb0899_carr_width(state) + SearchRange)) / 10);
			if (state->config->tuner_get_bandwidth)
				state->config->tuner_get_bandwidth(fe, &internal->tuner_bw);

			/* disable tuner I/O */
			stb0899_i2c_gate_ctrl(&state->frontend, 0);

			/* Set DVB-S1 AGC		*/
			stb0899_write_reg(state, STB0899_AGCRFCFG, 0x11);

			/* Run the search algorithm	*/
			dprintk(state->verbose, FE_DEBUG, 1, "running DVB-S search algo ..");
			if (stb0899_dvbs_algo(state)	== RANGEOK) {
				internal->lock		= 1;
				dprintk(state->verbose, FE_DEBUG, 1,
					"-------------------------------------> DVB-S LOCK !");

//				stb0899_write_reg(state, STB0899_ERRCTRL1, 0x3d); /* Viterbi Errors	*/
//				internal->v_status = stb0899_read_reg(state, STB0899_VSTATUS);
//				internal->err_ctrl = stb0899_read_reg(state, STB0899_ERRCTRL1);
//				dprintk(state->verbose, FE_DEBUG, 1, "VSTATUS=0x%02x", internal->v_status);
//				dprintk(state->verbose, FE_DEBUG, 1, "ERR_CTRL=0x%02x", internal->err_ctrl);

				return DVBFE_ALGO_SEARCH_SUCCESS;
			} else {
				internal->lock		= 0;

				return DVBFE_ALGO_SEARCH_FAILED;
			}
			break;
		case SYS_DVBS2:
			internal->freq			= i_params->freq;
			internal->srate			= i_params->srate;
			internal->srch_range		= SearchRange;

			/* enable tuner I/O */
			stb0899_i2c_gate_ctrl(&state->frontend, 1);

			if (state->config->tuner_set_bandwidth)
				state->config->tuner_set_bandwidth(fe, (stb0899_carr_width(state) + SearchRange));
			if (state->config->tuner_get_bandwidth)
				state->config->tuner_get_bandwidth(fe, &internal->tuner_bw);

			/* disable tuner I/O */
			stb0899_i2c_gate_ctrl(&state->frontend, 0);

//			pParams->SpectralInv		= pSearch->IQ_Inversion;

			/* Set DVB-S2 AGC		*/
			stb0899_write_reg(state, STB0899_AGCRFCFG, 0x1c);

			/* Set IterScale =f(MCLK,SYMB)	*/
			stb0899_set_iterations(state);

			/* Run the search algorithm	*/
			dprintk(state->verbose, FE_DEBUG, 1, "running DVB-S2 search algo ..");
			if (stb0899_dvbs2_algo(state)	== DVBS2_FEC_LOCK) {
				internal->lock		= 1;
				dprintk(state->verbose, FE_DEBUG, 1,
					"-------------------------------------> DVB-S2 LOCK !");

//				stb0899_write_reg(state, STB0899_ERRCTRL1, 0xb6); /* Packet Errors	*/
//				internal->v_status = stb0899_read_reg(state, STB0899_VSTATUS);
//				internal->err_ctrl = stb0899_read_reg(state, STB0899_ERRCTRL1);

				return DVBFE_ALGO_SEARCH_SUCCESS;
			} else {
				internal->lock		= 0;

				return DVBFE_ALGO_SEARCH_FAILED;
			}
			break;
		default:
			dprintk(state->verbose, FE_ERROR, 1, "Unsupported delivery system");
			return DVBFE_ALGO_SEARCH_INVALID;
		}
	}

	return DVBFE_ALGO_SEARCH_ERROR;
}

static int stb0899_get_frontend(struct dvb_frontend *fe,
				struct dtv_frontend_properties *p)
{
	struct stb0899_state *state		= fe->demodulator_priv;
	struct stb0899_internal *internal	= &state->internal;

	dprintk(state->verbose, FE_DEBUG, 1, "Get params");
	p->symbol_rate = internal->srate;
	p->frequency = internal->freq;

	return 0;
}

static enum dvbfe_algo stb0899_frontend_algo(struct dvb_frontend *fe)
{
	return DVBFE_ALGO_CUSTOM;
}

static const struct dvb_frontend_ops stb0899_ops = {
	.delsys = { SYS_DVBS, SYS_DVBS2, SYS_DSS },
	.info = {
		.name 			= "STB0899 Multistandard",
		.frequency_min		= 950000,
		.frequency_max 		= 2150000,
		.frequency_stepsize	= 0,
		.frequency_tolerance	= 0,
		.symbol_rate_min 	=  5000000,
		.symbol_rate_max 	= 45000000,

		.caps 			= FE_CAN_INVERSION_AUTO	|
					  FE_CAN_FEC_AUTO	|
					  FE_CAN_2G_MODULATION	|
					  FE_CAN_QPSK
	},

	.detach				= stb0899_detach,
	.release			= stb0899_release,
	.init				= stb0899_init,
	.sleep				= stb0899_sleep,
//	.wakeup				= stb0899_wakeup,

	.i2c_gate_ctrl			= stb0899_i2c_gate_ctrl,

	.get_frontend_algo		= stb0899_frontend_algo,
	.search				= stb0899_search,
	.get_frontend                   = stb0899_get_frontend,


	.read_status			= stb0899_read_status,
	.read_snr			= stb0899_read_snr,
	.read_signal_strength		= stb0899_read_signal_strength,
	.read_ber			= stb0899_read_ber,

	.set_voltage			= stb0899_set_voltage,
	.set_tone			= stb0899_set_tone,

	.diseqc_send_master_cmd		= stb0899_send_diseqc_msg,
	.diseqc_recv_slave_reply	= stb0899_recv_slave_reply,
	.diseqc_send_burst		= stb0899_send_diseqc_burst,
};

struct dvb_frontend *stb0899_attach(struct stb0899_config *config, struct i2c_adapter *i2c)
{
	struct stb0899_state *state = NULL;

	state = kzalloc(sizeof (struct stb0899_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	state->verbose				= &verbose;
	state->config				= config;
	state->i2c				= i2c;
	state->frontend.ops			= stb0899_ops;
	state->frontend.demodulator_priv	= state;
	/* use configured inversion as default -- we'll later autodetect inversion */
	state->internal.inversion		= config->inversion;

	stb0899_wakeup(&state->frontend);
	if (stb0899_get_dev_id(state) == -ENODEV) {
		printk("%s: Exiting .. !\n", __func__);
		goto error;
	}

	printk("%s: Attaching STB0899 \n", __func__);
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(stb0899_attach);
MODULE_PARM_DESC(verbose, "Set Verbosity level");
MODULE_AUTHOR("Manu Abraham");
MODULE_DESCRIPTION("STB0899 Multi-Std frontend");
MODULE_LICENSE("GPL");