linux-stable/drivers/media/dvb-frontends/cx24117.c

/*
    Conexant cx24117/cx24132 - Dual DVBS/S2 Satellite demod/tuner driver

    Copyright (C) 2013 Luis Alves <ljalvs@gmail.com>
	July, 6th 2013
	    First release based on cx24116 driver by:
	    Steven Toth and Georg Acher, Darron Broad, Igor Liplianin
	    Cards currently supported:
		TBS6980 - Dual DVBS/S2 PCIe card
		TBS6981 - Dual DVBS/S2 PCIe card

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

#include "dvb_frontend.h"
#include "cx24117.h"


#define CX24117_DEFAULT_FIRMWARE "dvb-fe-cx24117.fw"
#define CX24117_SEARCH_RANGE_KHZ 5000

/* known registers */
#define CX24117_REG_COMMAND      (0x00)      /* command buffer */
#define CX24117_REG_EXECUTE      (0x1f)      /* execute command */

#define CX24117_REG_FREQ3_0      (0x34)      /* frequency */
#define CX24117_REG_FREQ2_0      (0x35)
#define CX24117_REG_FREQ1_0      (0x36)
#define CX24117_REG_STATE0       (0x39)
#define CX24117_REG_SSTATUS0     (0x3a)      /* demod0 signal high / status */
#define CX24117_REG_SIGNAL0      (0x3b)
#define CX24117_REG_FREQ5_0      (0x3c)      /* +-freq */
#define CX24117_REG_FREQ6_0      (0x3d)
#define CX24117_REG_SRATE2_0     (0x3e)      /* +- 1000 * srate */
#define CX24117_REG_SRATE1_0     (0x3f)
#define CX24117_REG_QUALITY2_0   (0x40)
#define CX24117_REG_QUALITY1_0   (0x41)

#define CX24117_REG_BER4_0       (0x47)
#define CX24117_REG_BER3_0       (0x48)
#define CX24117_REG_BER2_0       (0x49)
#define CX24117_REG_BER1_0       (0x4a)
#define CX24117_REG_DVBS_UCB2_0  (0x4b)
#define CX24117_REG_DVBS_UCB1_0  (0x4c)
#define CX24117_REG_DVBS2_UCB2_0 (0x50)
#define CX24117_REG_DVBS2_UCB1_0 (0x51)
#define CX24117_REG_QSTATUS0     (0x93)
#define CX24117_REG_CLKDIV0      (0xe6)
#define CX24117_REG_RATEDIV0     (0xf0)


#define CX24117_REG_FREQ3_1      (0x55)      /* frequency */
#define CX24117_REG_FREQ2_1      (0x56)
#define CX24117_REG_FREQ1_1      (0x57)
#define CX24117_REG_STATE1       (0x5a)
#define CX24117_REG_SSTATUS1     (0x5b)      /* demod1 signal high / status */
#define CX24117_REG_SIGNAL1      (0x5c)
#define CX24117_REG_FREQ5_1      (0x5d)      /* +- freq */
#define CX24117_REG_FREQ4_1      (0x5e)
#define CX24117_REG_SRATE2_1     (0x5f)
#define CX24117_REG_SRATE1_1     (0x60)
#define CX24117_REG_QUALITY2_1   (0x61)
#define CX24117_REG_QUALITY1_1   (0x62)
#define CX24117_REG_BER4_1       (0x68)
#define CX24117_REG_BER3_1       (0x69)
#define CX24117_REG_BER2_1       (0x6a)
#define CX24117_REG_BER1_1       (0x6b)
#define CX24117_REG_DVBS_UCB2_1  (0x6c)
#define CX24117_REG_DVBS_UCB1_1  (0x6d)
#define CX24117_REG_DVBS2_UCB2_1 (0x71)
#define CX24117_REG_DVBS2_UCB1_1 (0x72)
#define CX24117_REG_QSTATUS1     (0x9f)
#define CX24117_REG_CLKDIV1      (0xe7)
#define CX24117_REG_RATEDIV1     (0xf1)


/* arg buffer size */
#define CX24117_ARGLEN       (0x1e)

/* rolloff */
#define CX24117_ROLLOFF_020  (0x00)
#define CX24117_ROLLOFF_025  (0x01)
#define CX24117_ROLLOFF_035  (0x02)

/* pilot bit */
#define CX24117_PILOT_OFF    (0x00)
#define CX24117_PILOT_ON     (0x40)
#define CX24117_PILOT_AUTO   (0x80)

/* signal status */
#define CX24117_HAS_SIGNAL   (0x01)
#define CX24117_HAS_CARRIER  (0x02)
#define CX24117_HAS_VITERBI  (0x04)
#define CX24117_HAS_SYNCLOCK (0x08)
#define CX24117_STATUS_MASK  (0x0f)
#define CX24117_SIGNAL_MASK  (0xc0)


/* arg offset for DiSEqC */
#define CX24117_DISEQC_DEMOD  (1)
#define CX24117_DISEQC_BURST  (2)
#define CX24117_DISEQC_ARG3_2 (3)   /* unknown value=2 */
#define CX24117_DISEQC_ARG4_0 (4)   /* unknown value=0 */
#define CX24117_DISEQC_ARG5_0 (5)   /* unknown value=0 */
#define CX24117_DISEQC_MSGLEN (6)
#define CX24117_DISEQC_MSGOFS (7)

/* DiSEqC burst */
#define CX24117_DISEQC_MINI_A (0)
#define CX24117_DISEQC_MINI_B (1)


#define CX24117_PNE	(0) /* 0 disabled / 2 enabled */
#define CX24117_OCC	(1) /* 0 disabled / 1 enabled */


enum cmds {
	CMD_SET_VCO     = 0x10,
	CMD_TUNEREQUEST = 0x11,
	CMD_MPEGCONFIG  = 0x13,
	CMD_TUNERINIT   = 0x14,
	CMD_LNBSEND     = 0x21, /* Formerly CMD_SEND_DISEQC */
	CMD_LNBDCLEVEL  = 0x22,
	CMD_SET_TONE    = 0x23,
	CMD_UPDFWVERS   = 0x35,
	CMD_TUNERSLEEP  = 0x36,
};

/* The Demod/Tuner can't easily provide these, we cache them */
struct cx24117_tuning {
	u32 frequency;
	u32 symbol_rate;
	fe_spectral_inversion_t inversion;
	fe_code_rate_t fec;

	fe_delivery_system_t delsys;
	fe_modulation_t modulation;
	fe_pilot_t pilot;
	fe_rolloff_t rolloff;

	/* Demod values */
	u8 fec_val;
	u8 fec_mask;
	u8 inversion_val;
	u8 pilot_val;
	u8 rolloff_val;
};

/* Basic commands that are sent to the firmware */
struct cx24117_cmd {
	u8 len;
	u8 args[CX24117_ARGLEN];
};

/* common to both fe's */
struct cx24117_priv {
	u8 demod_address;
	struct i2c_adapter *i2c;
	u8 skip_fw_load;

	struct mutex fe_lock;
	atomic_t fe_nr;
};

/* one per each fe */
struct cx24117_state {
	struct cx24117_priv *priv;
	struct dvb_frontend frontend;

	struct cx24117_tuning dcur;
	struct cx24117_tuning dnxt;
	struct cx24117_cmd dsec_cmd;

	int demod;
};

/* modfec (modulation and FEC) lookup table */
/* Check cx24116.c for a detailed description of each field */
static struct cx24117_modfec {
	fe_delivery_system_t delivery_system;
	fe_modulation_t modulation;
	fe_code_rate_t fec;
	u8 mask;	/* In DVBS mode this is used to autodetect */
	u8 val;		/* Passed to the firmware to indicate mode selection */
} cx24117_modfec_modes[] = {
	/* QPSK. For unknown rates we set hardware to auto detect 0xfe 0x30 */

	/*mod   fec       mask  val */
	{ SYS_DVBS, QPSK, FEC_NONE, 0xfe, 0x30 },
	{ SYS_DVBS, QPSK, FEC_1_2,  0x02, 0x2e }, /* 00000010 00101110 */
	{ SYS_DVBS, QPSK, FEC_2_3,  0x04, 0x2f }, /* 00000100 00101111 */
	{ SYS_DVBS, QPSK, FEC_3_4,  0x08, 0x30 }, /* 00001000 00110000 */
	{ SYS_DVBS, QPSK, FEC_4_5,  0xfe, 0x30 }, /* 000?0000 ?        */
	{ SYS_DVBS, QPSK, FEC_5_6,  0x20, 0x31 }, /* 00100000 00110001 */
	{ SYS_DVBS, QPSK, FEC_6_7,  0xfe, 0x30 }, /* 0?000000 ?        */
	{ SYS_DVBS, QPSK, FEC_7_8,  0x80, 0x32 }, /* 10000000 00110010 */
	{ SYS_DVBS, QPSK, FEC_8_9,  0xfe, 0x30 }, /* 0000000? ?        */
	{ SYS_DVBS, QPSK, FEC_AUTO, 0xfe, 0x30 },
	/* NBC-QPSK */
	{ SYS_DVBS2, QPSK, FEC_NONE, 0x00, 0x00 },
	{ SYS_DVBS2, QPSK, FEC_1_2,  0x00, 0x04 },
	{ SYS_DVBS2, QPSK, FEC_3_5,  0x00, 0x05 },
	{ SYS_DVBS2, QPSK, FEC_2_3,  0x00, 0x06 },
	{ SYS_DVBS2, QPSK, FEC_3_4,  0x00, 0x07 },
	{ SYS_DVBS2, QPSK, FEC_4_5,  0x00, 0x08 },
	{ SYS_DVBS2, QPSK, FEC_5_6,  0x00, 0x09 },
	{ SYS_DVBS2, QPSK, FEC_8_9,  0x00, 0x0a },
	{ SYS_DVBS2, QPSK, FEC_9_10, 0x00, 0x0b },
	{ SYS_DVBS2, QPSK, FEC_AUTO, 0x00, 0x00 },
	/* 8PSK */
	{ SYS_DVBS2, PSK_8, FEC_NONE, 0x00, 0x00 },
	{ SYS_DVBS2, PSK_8, FEC_3_5,  0x00, 0x0c },
	{ SYS_DVBS2, PSK_8, FEC_2_3,  0x00, 0x0d },
	{ SYS_DVBS2, PSK_8, FEC_3_4,  0x00, 0x0e },
	{ SYS_DVBS2, PSK_8, FEC_5_6,  0x00, 0x0f },
	{ SYS_DVBS2, PSK_8, FEC_8_9,  0x00, 0x10 },
	{ SYS_DVBS2, PSK_8, FEC_9_10, 0x00, 0x11 },
	{ SYS_DVBS2, PSK_8, FEC_AUTO, 0x00, 0x00 },
	/*
	 * 'val' can be found in the FECSTATUS register when tuning.
	 * FECSTATUS will give the actual FEC in use if tuning was successful.
	 */
};


static int cx24117_writereg(struct cx24117_state *state, u8 reg, u8 data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->priv->demod_address,
		.flags = 0, .buf = buf, .len = 2 };
	int ret;

	dev_dbg(&state->priv->i2c->dev,
			"%s() demod%d i2c wr @0x%02x=0x%02x\n",
			__func__, state->demod, reg, data);

	ret = i2c_transfer(state->priv->i2c, &msg, 1);
	if (ret < 0) {
		dev_warn(&state->priv->i2c->dev,
			"%s: demod%d i2c wr err(%i) @0x%02x=0x%02x\n",
			KBUILD_MODNAME, state->demod, ret, reg, data);
		return ret;
	}
	return 0;
}

static int cx24117_writecmd(struct cx24117_state *state,
	struct cx24117_cmd *cmd)
{
	struct i2c_msg msg;
	u8 buf[CX24117_ARGLEN+1];
	int ret;

	dev_dbg(&state->priv->i2c->dev,
			"%s() demod%d i2c wr cmd len=%d\n",
			__func__, state->demod, cmd->len);

	buf[0] = CX24117_REG_COMMAND;
	memcpy(&buf[1], cmd->args, cmd->len);

	msg.addr = state->priv->demod_address;
	msg.flags = 0;
	msg.len = cmd->len+1;
	msg.buf = buf;
	ret = i2c_transfer(state->priv->i2c, &msg, 1);
	if (ret < 0) {
		dev_warn(&state->priv->i2c->dev,
			"%s: demod%d i2c wr cmd err(%i) len=%d\n",
			KBUILD_MODNAME, state->demod, ret, cmd->len);
		return ret;
	}
	return 0;
}

static int cx24117_readreg(struct cx24117_state *state, u8 reg)
{
	int ret;
	u8 recv = 0;
	struct i2c_msg msg[] = {
		{ .addr = state->priv->demod_address, .flags = 0,
			.buf = &reg, .len = 1 },
		{ .addr = state->priv->demod_address, .flags = I2C_M_RD,
			.buf = &recv, .len = 1 }
	};

	ret = i2c_transfer(state->priv->i2c, msg, 2);
	if (ret < 0) {
		dev_warn(&state->priv->i2c->dev,
			"%s: demod%d i2c rd err(%d) @0x%x\n",
			KBUILD_MODNAME, state->demod, ret, reg);
		return ret;
	}

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d i2c rd @0x%02x=0x%02x\n",
		__func__, state->demod, reg, recv);

	return recv;
}

static int cx24117_readregN(struct cx24117_state *state,
	u8 reg, u8 *buf, int len)
{
	int ret;
	struct i2c_msg msg[] = {
		{ .addr = state->priv->demod_address, .flags = 0,
			.buf = &reg, .len = 1 },
		{ .addr = state->priv->demod_address, .flags = I2C_M_RD,
			.buf = buf, .len = len }
	};

	ret = i2c_transfer(state->priv->i2c, msg, 2);
	if (ret < 0) {
		dev_warn(&state->priv->i2c->dev,
			"%s: demod%d i2c rd err(%d) @0x%x\n",
			KBUILD_MODNAME, state->demod, ret, reg);
		return ret;
	}
	return 0;
}

static int cx24117_set_inversion(struct cx24117_state *state,
	fe_spectral_inversion_t inversion)
{
	dev_dbg(&state->priv->i2c->dev, "%s(%d) demod%d\n",
		__func__, inversion, state->demod);

	switch (inversion) {
	case INVERSION_OFF:
		state->dnxt.inversion_val = 0x00;
		break;
	case INVERSION_ON:
		state->dnxt.inversion_val = 0x04;
		break;
	case INVERSION_AUTO:
		state->dnxt.inversion_val = 0x0C;
		break;
	default:
		return -EINVAL;
	}

	state->dnxt.inversion = inversion;

	return 0;
}

static int cx24117_lookup_fecmod(struct cx24117_state *state,
	fe_delivery_system_t d, fe_modulation_t m, fe_code_rate_t f)
{
	int i, ret = -EINVAL;

	dev_dbg(&state->priv->i2c->dev,
		"%s(demod(0x%02x,0x%02x) demod%d\n",
		__func__, m, f, state->demod);

	for (i = 0; i < ARRAY_SIZE(cx24117_modfec_modes); i++) {
		if ((d == cx24117_modfec_modes[i].delivery_system) &&
			(m == cx24117_modfec_modes[i].modulation) &&
			(f == cx24117_modfec_modes[i].fec)) {
				ret = i;
				break;
			}
	}

	return ret;
}

static int cx24117_set_fec(struct cx24117_state *state,
	fe_delivery_system_t delsys, fe_modulation_t mod, fe_code_rate_t fec)
{
	int ret;

	dev_dbg(&state->priv->i2c->dev,
		"%s(0x%02x,0x%02x) demod%d\n",
		__func__, mod, fec, state->demod);

	ret = cx24117_lookup_fecmod(state, delsys, mod, fec);
	if (ret < 0)
		return ret;

	state->dnxt.fec = fec;
	state->dnxt.fec_val = cx24117_modfec_modes[ret].val;
	state->dnxt.fec_mask = cx24117_modfec_modes[ret].mask;
	dev_dbg(&state->priv->i2c->dev,
		"%s() demod%d mask/val = 0x%02x/0x%02x\n", __func__,
		state->demod, state->dnxt.fec_mask, state->dnxt.fec_val);

	return 0;
}

static int cx24117_set_symbolrate(struct cx24117_state *state, u32 rate)
{
	dev_dbg(&state->priv->i2c->dev, "%s(%d) demod%d\n",
		__func__, rate, state->demod);

	state->dnxt.symbol_rate = rate;

	dev_dbg(&state->priv->i2c->dev,
		"%s() demod%d symbol_rate = %d\n",
		__func__, state->demod, rate);

	return 0;
}

static int cx24117_load_firmware(struct dvb_frontend *fe,
	const struct firmware *fw);

static int cx24117_firmware_ondemand(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	const struct firmware *fw;
	int ret = 0;

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d skip_fw_load=%d\n",
		__func__, state->demod, state->priv->skip_fw_load);

	if (state->priv->skip_fw_load)
		return 0;

	/* check if firmware if already running */
	if (cx24117_readreg(state, 0xeb) != 0xa) {
		/* Load firmware */
		/* request the firmware, this will block until loaded */
		dev_dbg(&state->priv->i2c->dev,
			"%s: Waiting for firmware upload (%s)...\n",
			__func__, CX24117_DEFAULT_FIRMWARE);
		ret = request_firmware(&fw, CX24117_DEFAULT_FIRMWARE,
			state->priv->i2c->dev.parent);
		dev_dbg(&state->priv->i2c->dev,
			"%s: Waiting for firmware upload(2)...\n", __func__);
		if (ret) {
			dev_err(&state->priv->i2c->dev,
				"%s: No firmware uploaded "
				"(timeout or file not found?)\n", __func__);
			return ret;
		}

		/* Make sure we don't recurse back through here
		 * during loading */
		state->priv->skip_fw_load = 1;

		ret = cx24117_load_firmware(fe, fw);
		if (ret)
			dev_err(&state->priv->i2c->dev,
				"%s: Writing firmware failed\n", __func__);
		release_firmware(fw);

		dev_info(&state->priv->i2c->dev,
			"%s: Firmware upload %s\n", __func__,
			ret == 0 ? "complete" : "failed");

		/* Ensure firmware is always loaded if required */
		state->priv->skip_fw_load = 0;
	}

	return ret;
}

/* Take a basic firmware command structure, format it
 * and forward it for processing
 */
static int cx24117_cmd_execute_nolock(struct dvb_frontend *fe,
	struct cx24117_cmd *cmd)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int i, ret;

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

	/* Load the firmware if required */
	ret = cx24117_firmware_ondemand(fe);
	if (ret != 0)
		return ret;

	/* Write the command */
	cx24117_writecmd(state, cmd);

	/* Start execution and wait for cmd to terminate */
	cx24117_writereg(state, CX24117_REG_EXECUTE, 0x01);
	i = 0;
	while (cx24117_readreg(state, CX24117_REG_EXECUTE)) {
		msleep(20);
		if (i++ > 40) {
			/* Avoid looping forever if the firmware does
				not respond */
			dev_warn(&state->priv->i2c->dev,
				"%s() Firmware not responding\n", __func__);
			return -EIO;
		}
	}
	return 0;
}

static int cx24117_cmd_execute(struct dvb_frontend *fe, struct cx24117_cmd *cmd)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int ret;

	mutex_lock(&state->priv->fe_lock);
	ret = cx24117_cmd_execute_nolock(fe, cmd);
	mutex_unlock(&state->priv->fe_lock);

	return ret;
}

static int cx24117_load_firmware(struct dvb_frontend *fe,
	const struct firmware *fw)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;
	int i, ret;
	unsigned char vers[4];

	struct i2c_msg msg;
	u8 *buf;

	dev_dbg(&state->priv->i2c->dev,
		"%s() demod%d FW is %zu bytes (%02x %02x .. %02x %02x)\n",
		__func__, state->demod, fw->size, fw->data[0], fw->data[1],
		fw->data[fw->size-2], fw->data[fw->size-1]);

	cx24117_writereg(state, 0xea, 0x00);
	cx24117_writereg(state, 0xea, 0x01);
	cx24117_writereg(state, 0xea, 0x00);

	cx24117_writereg(state, 0xce, 0x92);

	cx24117_writereg(state, 0xfb, 0x00);
	cx24117_writereg(state, 0xfc, 0x00);

	cx24117_writereg(state, 0xc3, 0x04);
	cx24117_writereg(state, 0xc4, 0x04);

	cx24117_writereg(state, 0xce, 0x00);
	cx24117_writereg(state, 0xcf, 0x00);

	cx24117_writereg(state, 0xea, 0x00);
	cx24117_writereg(state, 0xeb, 0x0c);
	cx24117_writereg(state, 0xec, 0x06);
	cx24117_writereg(state, 0xed, 0x05);
	cx24117_writereg(state, 0xee, 0x03);
	cx24117_writereg(state, 0xef, 0x05);

	cx24117_writereg(state, 0xf3, 0x03);
	cx24117_writereg(state, 0xf4, 0x44);

	cx24117_writereg(state, CX24117_REG_RATEDIV0, 0x04);
	cx24117_writereg(state, CX24117_REG_CLKDIV0, 0x02);

	cx24117_writereg(state, CX24117_REG_RATEDIV1, 0x04);
	cx24117_writereg(state, CX24117_REG_CLKDIV1, 0x02);

	cx24117_writereg(state, 0xf2, 0x04);
	cx24117_writereg(state, 0xe8, 0x02);
	cx24117_writereg(state, 0xea, 0x01);
	cx24117_writereg(state, 0xc8, 0x00);
	cx24117_writereg(state, 0xc9, 0x00);
	cx24117_writereg(state, 0xca, 0x00);
	cx24117_writereg(state, 0xcb, 0x00);
	cx24117_writereg(state, 0xcc, 0x00);
	cx24117_writereg(state, 0xcd, 0x00);
	cx24117_writereg(state, 0xe4, 0x03);
	cx24117_writereg(state, 0xeb, 0x0a);

	cx24117_writereg(state, 0xfb, 0x00);
	cx24117_writereg(state, 0xe0, 0x76);
	cx24117_writereg(state, 0xf7, 0x81);
	cx24117_writereg(state, 0xf8, 0x00);
	cx24117_writereg(state, 0xf9, 0x00);

	buf = kmalloc(fw->size + 1, GFP_KERNEL);
	if (buf == NULL) {
		state->priv->skip_fw_load = 0;
		return -ENOMEM;
	}

	/* fw upload reg */
	buf[0] = 0xfa;
	memcpy(&buf[1], fw->data, fw->size);

	/* prepare i2c message to send */
	msg.addr = state->priv->demod_address;
	msg.flags = 0;
	msg.len = fw->size + 1;
	msg.buf = buf;

	/* send fw */
	ret = i2c_transfer(state->priv->i2c, &msg, 1);
	if (ret < 0)
		return ret;

	kfree(buf);

	cx24117_writereg(state, 0xf7, 0x0c);
	cx24117_writereg(state, 0xe0, 0x00);

	/* CMD 1B */
	cmd.args[0] = 0x1b;
	cmd.args[1] = 0x00;
	cmd.args[2] = 0x01;
	cmd.args[3] = 0x00;
	cmd.len = 4;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		goto error;

	/* CMD 10 */
	cmd.args[0] = CMD_SET_VCO;
	cmd.args[1] = 0x06;
	cmd.args[2] = 0x2b;
	cmd.args[3] = 0xd8;
	cmd.args[4] = 0xa5;
	cmd.args[5] = 0xee;
	cmd.args[6] = 0x03;
	cmd.args[7] = 0x9d;
	cmd.args[8] = 0xfc;
	cmd.args[9] = 0x06;
	cmd.args[10] = 0x02;
	cmd.args[11] = 0x9d;
	cmd.args[12] = 0xfc;
	cmd.len = 13;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		goto error;

	/* CMD 15 */
	cmd.args[0] = 0x15;
	cmd.args[1] = 0x00;
	cmd.args[2] = 0x01;
	cmd.args[3] = 0x00;
	cmd.args[4] = 0x00;
	cmd.args[5] = 0x01;
	cmd.args[6] = 0x01;
	cmd.args[7] = 0x01;
	cmd.args[8] = 0x00;
	cmd.args[9] = 0x05;
	cmd.args[10] = 0x02;
	cmd.args[11] = 0x02;
	cmd.args[12] = 0x00;
	cmd.len = 13;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		goto error;

	/* CMD 13 */
	cmd.args[0] = CMD_MPEGCONFIG;
	cmd.args[1] = 0x00;
	cmd.args[2] = 0x00;
	cmd.args[3] = 0x00;
	cmd.args[4] = 0x01;
	cmd.args[5] = 0x00;
	cmd.len = 6;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		goto error;

	/* CMD 14 */
	for (i = 0; i < 2; i++) {
		cmd.args[0] = CMD_TUNERINIT;
		cmd.args[1] = (u8) i;
		cmd.args[2] = 0x00;
		cmd.args[3] = 0x05;
		cmd.args[4] = 0x00;
		cmd.args[5] = 0x00;
		cmd.args[6] = 0x55;
		cmd.args[7] = 0x00;
		cmd.len = 8;
		ret = cx24117_cmd_execute_nolock(fe, &cmd);
		if (ret != 0)
			goto error;
	}

	cx24117_writereg(state, 0xce, 0xc0);
	cx24117_writereg(state, 0xcf, 0x00);
	cx24117_writereg(state, 0xe5, 0x04);

	/* Firmware CMD 35: Get firmware version */
	cmd.args[0] = CMD_UPDFWVERS;
	cmd.len = 2;
	for (i = 0; i < 4; i++) {
		cmd.args[1] = i;
		ret = cx24117_cmd_execute_nolock(fe, &cmd);
		if (ret != 0)
			goto error;
		vers[i] = cx24117_readreg(state, 0x33);
	}
	dev_info(&state->priv->i2c->dev,
		"%s: FW version %i.%i.%i.%i\n", __func__,
		vers[0], vers[1], vers[2], vers[3]);
	return 0;
error:
	state->priv->skip_fw_load = 0;
	dev_err(&state->priv->i2c->dev, "%s() Error running FW.\n", __func__);
	return ret;
}

static int cx24117_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int lock;

	lock = cx24117_readreg(state,
		(state->demod == 0) ? CX24117_REG_SSTATUS0 :
				      CX24117_REG_SSTATUS1) &
		CX24117_STATUS_MASK;

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d status = 0x%02x\n",
		__func__, state->demod, lock);

	*status = 0;

	if (lock & CX24117_HAS_SIGNAL)
		*status |= FE_HAS_SIGNAL;
	if (lock & CX24117_HAS_CARRIER)
		*status |= FE_HAS_CARRIER;
	if (lock & CX24117_HAS_VITERBI)
		*status |= FE_HAS_VITERBI;
	if (lock & CX24117_HAS_SYNCLOCK)
		*status |= FE_HAS_SYNC | FE_HAS_LOCK;

	return 0;
}

static int cx24117_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int ret;
	u8 buf[4];
	u8 base_reg = (state->demod == 0) ?
			CX24117_REG_BER4_0 :
			CX24117_REG_BER4_1;

	ret = cx24117_readregN(state, base_reg, buf, 4);
	if (ret != 0)
		return ret;

	*ber = (buf[0] << 24) | (buf[1] << 16) |
		(buf[1] << 8) | buf[0];

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d ber=0x%04x\n",
		__func__, state->demod, *ber);

	return 0;
}

static int cx24117_read_signal_strength(struct dvb_frontend *fe,
	u16 *signal_strength)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;
	int ret;
	u16 sig_reading;
	u8 buf[2];
	u8 reg = (state->demod == 0) ?
		CX24117_REG_SSTATUS0 : CX24117_REG_SSTATUS1;

	/* Firmware CMD 1A */
	cmd.args[0] = 0x1a;
	cmd.args[1] = (u8) state->demod;
	cmd.len = 2;
	ret = cx24117_cmd_execute(fe, &cmd);
	if (ret != 0)
		return ret;

	ret = cx24117_readregN(state, reg, buf, 2);
	if (ret != 0)
		return ret;
	sig_reading = ((buf[0] & CX24117_SIGNAL_MASK) << 2) | buf[1];

	*signal_strength = -100 * sig_reading + 94324;

	dev_dbg(&state->priv->i2c->dev,
		"%s() demod%d raw / cooked = 0x%04x / 0x%04x\n",
		__func__, state->demod, sig_reading, *signal_strength);

	return 0;
}

static int cx24117_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int ret;
	u8 buf[2];
	u8 reg = (state->demod == 0) ?
		CX24117_REG_QUALITY2_0 : CX24117_REG_QUALITY2_1;

	ret = cx24117_readregN(state, reg, buf, 2);
	if (ret != 0)
		return ret;

	*snr = (buf[0] << 8) | buf[1];

	dev_dbg(&state->priv->i2c->dev,
		"%s() demod%d snr = 0x%04x\n",
		__func__, state->demod, *snr);

	return ret;
}

static int cx24117_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct cx24117_state *state = fe->demodulator_priv;
	fe_delivery_system_t delsys = fe->dtv_property_cache.delivery_system;
	int ret;
	u8 buf[2];
	u8 reg = (state->demod == 0) ?
		CX24117_REG_DVBS_UCB2_0 :
		CX24117_REG_DVBS_UCB2_1;

	switch (delsys) {
	case SYS_DVBS:
		break;
	case SYS_DVBS2:
		reg += (CX24117_REG_DVBS2_UCB2_0 - CX24117_REG_DVBS_UCB2_0);
		break;
	default:
		return -EINVAL;
	}

	ret = cx24117_readregN(state, reg, buf, 2);
	if (ret != 0)
		return ret;
	*ucblocks = (buf[0] << 8) | buf[1];

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d ucb=0x%04x\n",
		__func__, state->demod, *ucblocks);

	return 0;
}

/* Overwrite the current tuning params, we are about to tune */
static void cx24117_clone_params(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	state->dcur = state->dnxt;
}

/* Wait for LNB */
static int cx24117_wait_for_lnb(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int i;
	u8 val, reg = (state->demod == 0) ? CX24117_REG_QSTATUS0 :
					    CX24117_REG_QSTATUS1;

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d qstatus = 0x%02x\n",
		__func__, state->demod, cx24117_readreg(state, reg));

	/* Wait for up to 300 ms */
	for (i = 0; i < 10; i++) {
		val = cx24117_readreg(state, reg) & 0x01;
		if (val != 0)
			return 0;
		msleep(30);
	}

	dev_warn(&state->priv->i2c->dev, "%s: demod%d LNB not ready\n",
		KBUILD_MODNAME, state->demod);

	return -ETIMEDOUT; /* -EBUSY ? */
}

static int cx24117_set_voltage(struct dvb_frontend *fe,
	fe_sec_voltage_t voltage)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;
	int ret;
	u8 reg = (state->demod == 0) ? 0x10 : 0x20;

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d %s\n",
		__func__, state->demod,
		voltage == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
		voltage == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" :
		"SEC_VOLTAGE_OFF");

	/* CMD 32 */
	cmd.args[0] = 0x32;
	cmd.args[1] = reg;
	cmd.args[2] = reg;
	cmd.len = 3;
	ret = cx24117_cmd_execute(fe, &cmd);
	if (ret)
		return ret;

	if ((voltage == SEC_VOLTAGE_13) ||
	    (voltage == SEC_VOLTAGE_18)) {
		/* CMD 33 */
		cmd.args[0] = 0x33;
		cmd.args[1] = reg;
		cmd.args[2] = reg;
		cmd.len = 3;
		ret = cx24117_cmd_execute(fe, &cmd);
		if (ret != 0)
			return ret;

		ret = cx24117_wait_for_lnb(fe);
		if (ret != 0)
			return ret;

		/* Wait for voltage/min repeat delay */
		msleep(100);

		/* CMD 22 - CMD_LNBDCLEVEL */
		cmd.args[0] = CMD_LNBDCLEVEL;
		cmd.args[1] = state->demod ? 0 : 1;
		cmd.args[2] = (voltage == SEC_VOLTAGE_18 ? 0x01 : 0x00);
		cmd.len = 3;

		/* Min delay time before DiSEqC send */
		msleep(20);
	} else {
		cmd.args[0] = 0x33;
		cmd.args[1] = 0x00;
		cmd.args[2] = reg;
		cmd.len = 3;
	}

	return cx24117_cmd_execute(fe, &cmd);
}

static int cx24117_set_tone(struct dvb_frontend *fe,
	fe_sec_tone_mode_t tone)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;
	int ret;

	dev_dbg(&state->priv->i2c->dev, "%s(%d) demod%d\n",
		__func__, state->demod, tone);
	if ((tone != SEC_TONE_ON) && (tone != SEC_TONE_OFF)) {
		dev_warn(&state->priv->i2c->dev, "%s: demod%d invalid tone=%d\n",
			KBUILD_MODNAME, state->demod, tone);
		return -EINVAL;
	}

	/* Wait for LNB ready */
	ret = cx24117_wait_for_lnb(fe);
	if (ret != 0)
		return ret;

	/* Min delay time after DiSEqC send */
	msleep(20);

	/* Set the tone */
	/* CMD 23 - CMD_SET_TONE */
	cmd.args[0] = CMD_SET_TONE;
	cmd.args[1] = (state->demod ? 0 : 1);
	cmd.args[2] = 0x00;
	cmd.args[3] = 0x00;
	cmd.len = 5;
	switch (tone) {
	case SEC_TONE_ON:
		cmd.args[4] = 0x01;
		break;
	case SEC_TONE_OFF:
		cmd.args[4] = 0x00;
		break;
	}

	msleep(20);

	return cx24117_cmd_execute(fe, &cmd);
}

/* Initialise DiSEqC */
static int cx24117_diseqc_init(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;

	/* Prepare a DiSEqC command */
	state->dsec_cmd.args[0] = CMD_LNBSEND;

	/* demod */
	state->dsec_cmd.args[CX24117_DISEQC_DEMOD] = state->demod ? 0 : 1;

	/* DiSEqC burst */
	state->dsec_cmd.args[CX24117_DISEQC_BURST] = CX24117_DISEQC_MINI_A;

	/* Unknown */
	state->dsec_cmd.args[CX24117_DISEQC_ARG3_2] = 0x02;
	state->dsec_cmd.args[CX24117_DISEQC_ARG4_0] = 0x00;

	/* Continuation flag? */
	state->dsec_cmd.args[CX24117_DISEQC_ARG5_0] = 0x00;

	/* DiSEqC message length */
	state->dsec_cmd.args[CX24117_DISEQC_MSGLEN] = 0x00;

	/* Command length */
	state->dsec_cmd.len = 7;

	return 0;
}

/* Send DiSEqC message */
static int cx24117_send_diseqc_msg(struct dvb_frontend *fe,
	struct dvb_diseqc_master_cmd *d)
{
	struct cx24117_state *state = fe->demodulator_priv;
	int i, ret;

	/* Dump DiSEqC message */
	dev_dbg(&state->priv->i2c->dev, "%s: demod %d (",
		__func__, state->demod);
	for (i = 0; i < d->msg_len; i++)
		dev_dbg(&state->priv->i2c->dev, "0x%02x ", d->msg[i]);
	dev_dbg(&state->priv->i2c->dev, ")\n");

	/* Validate length */
	if (d->msg_len > 15)
		return -EINVAL;

	/* DiSEqC message */
	for (i = 0; i < d->msg_len; i++)
		state->dsec_cmd.args[CX24117_DISEQC_MSGOFS + i] = d->msg[i];

	/* DiSEqC message length */
	state->dsec_cmd.args[CX24117_DISEQC_MSGLEN] = d->msg_len;

	/* Command length */
	state->dsec_cmd.len = CX24117_DISEQC_MSGOFS +
		state->dsec_cmd.args[CX24117_DISEQC_MSGLEN];

	/*
	 * Message is sent with derived else cached burst
	 *
	 * WRITE PORT GROUP COMMAND 38
	 *
	 * 0/A/A: E0 10 38 F0..F3
	 * 1/B/B: E0 10 38 F4..F7
	 * 2/C/A: E0 10 38 F8..FB
	 * 3/D/B: E0 10 38 FC..FF
	 *
	 * databyte[3]= 8421:8421
	 *              ABCD:WXYZ
	 *              CLR :SET
	 *
	 *              WX= PORT SELECT 0..3    (X=TONEBURST)
	 *              Y = VOLTAGE             (0=13V, 1=18V)
	 *              Z = BAND                (0=LOW, 1=HIGH(22K))
	 */
	if (d->msg_len >= 4 && d->msg[2] == 0x38)
		state->dsec_cmd.args[CX24117_DISEQC_BURST] =
			((d->msg[3] & 4) >> 2);

	dev_dbg(&state->priv->i2c->dev, "%s() demod%d burst=%d\n",
		__func__, state->demod,
		state->dsec_cmd.args[CX24117_DISEQC_BURST]);

	/* Wait for LNB ready */
	ret = cx24117_wait_for_lnb(fe);
	if (ret != 0)
		return ret;

	/* Wait for voltage/min repeat delay */
	msleep(100);

	/* Command */
	ret = cx24117_cmd_execute(fe, &state->dsec_cmd);
	if (ret != 0)
		return ret;
	/*
	 * Wait for send
	 *
	 * Eutelsat spec:
	 * >15ms delay          + (XXX determine if FW does this, see set_tone)
	 *  13.5ms per byte     +
	 * >15ms delay          +
	 *  12.5ms burst        +
	 * >15ms delay            (XXX determine if FW does this, see set_tone)
	 */
	msleep((state->dsec_cmd.args[CX24117_DISEQC_MSGLEN] << 4) + 60);

	return 0;
}

/* Send DiSEqC burst */
static int cx24117_diseqc_send_burst(struct dvb_frontend *fe,
	fe_sec_mini_cmd_t burst)
{
	struct cx24117_state *state = fe->demodulator_priv;

	dev_dbg(&state->priv->i2c->dev, "%s(%d) demod=%d\n",
		__func__, burst, state->demod);

	/* DiSEqC burst */
	if (burst == SEC_MINI_A)
		state->dsec_cmd.args[CX24117_DISEQC_BURST] =
			CX24117_DISEQC_MINI_A;
	else if (burst == SEC_MINI_B)
		state->dsec_cmd.args[CX24117_DISEQC_BURST] =
			CX24117_DISEQC_MINI_B;
	else
		return -EINVAL;

	return 0;
}

static void cx24117_release(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	dev_dbg(&state->priv->i2c->dev, "%s demod%d\n",
		__func__, state->demod);
	if (!atomic_dec_and_test(&state->priv->fe_nr))
		kfree(state->priv);
	kfree(state);
}

static struct dvb_frontend_ops cx24117_ops;

struct dvb_frontend *cx24117_attach(const struct cx24117_config *config,
	struct i2c_adapter *i2c, struct dvb_frontend *fe)
{
	struct cx24117_state *state = NULL;
	struct cx24117_priv *priv = NULL;
	int demod = 0;

	/* first frontend attaching */
	/* allocate shared priv struct */
	if (fe == NULL) {
		priv = kzalloc(sizeof(struct cx24117_priv), GFP_KERNEL);
		if (priv == NULL)
			goto error1;
		priv->i2c = i2c;
		priv->demod_address = config->demod_address;
		mutex_init(&priv->fe_lock);
	} else {
		demod = 1;
		priv = ((struct cx24117_state *) fe->demodulator_priv)->priv;
	}

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct cx24117_state), GFP_KERNEL);
	if (state == NULL)
		goto error2;

	state->demod = demod;
	state->priv = priv;

	/* test i2c bus for ack */
	if (demod == 0) {
		if (cx24117_readreg(state, 0x00) < 0)
			goto error3;
	}

	/* nr of frontends using the module */
	atomic_inc(&priv->fe_nr);

	dev_info(&state->priv->i2c->dev,
		"%s: Attaching frontend %d\n",
		KBUILD_MODNAME, demod);

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &cx24117_ops,
		sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error3:
	kfree(state);
error2:
	kfree(priv);
error1:
	return NULL;
}
EXPORT_SYMBOL_GPL(cx24117_attach);

/*
 * Initialise or wake up device
 *
 * Power config will reset and load initial firmware if required
 */
static int cx24117_initfe(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;
	int ret;

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

	mutex_lock(&state->priv->fe_lock);

	/* Firmware CMD 36: Power config */
	cmd.args[0] = CMD_TUNERSLEEP;
	cmd.args[1] = (state->demod ? 1 : 0);
	cmd.args[2] = 0;
	cmd.len = 3;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		return ret;

	ret = cx24117_diseqc_init(fe);
	if (ret != 0)
		return ret;

	/* CMD 3C */
	cmd.args[0] = 0x3c;
	cmd.args[1] = (state->demod ? 1 : 0);
	cmd.args[2] = 0x10;
	cmd.args[3] = 0x10;
	cmd.len = 4;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		return ret;

	/* CMD 34 */
	cmd.args[0] = 0x34;
	cmd.args[1] = (state->demod ? 1 : 0);
	cmd.args[2] = CX24117_OCC;
	cmd.len = 3;
	ret = cx24117_cmd_execute_nolock(fe, &cmd);
	if (ret != 0)
		return ret;

	mutex_unlock(&state->priv->fe_lock);

	return ret;
}

/*
 * Put device to sleep
 */
static int cx24117_sleep(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct cx24117_cmd cmd;

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

	/* Firmware CMD 36: Power config */
	cmd.args[0] = CMD_TUNERSLEEP;
	cmd.args[1] = (state->demod ? 1 : 0);
	cmd.args[2] = 1;
	cmd.len = 3;
	return cx24117_cmd_execute(fe, &cmd);
}

/* dvb-core told us to tune, the tv property cache will be complete,
 * it's safe for is to pull values and use them for tuning purposes.
 */
static int cx24117_set_frontend(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24117_cmd cmd;
	fe_status_t tunerstat;
	int i, status, ret, retune = 1;
	u8 reg_clkdiv, reg_ratediv;

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

	switch (c->delivery_system) {
	case SYS_DVBS:
		dev_dbg(&state->priv->i2c->dev, "%s() demod%d DVB-S\n",
			__func__, state->demod);

		/* Only QPSK is supported for DVB-S */
		if (c->modulation != QPSK) {
			dev_dbg(&state->priv->i2c->dev,
				"%s() demod%d unsupported modulation (%d)\n",
				__func__, state->demod, c->modulation);
			return -EINVAL;
		}

		/* Pilot doesn't exist in DVB-S, turn bit off */
		state->dnxt.pilot_val = CX24117_PILOT_OFF;

		/* DVB-S only supports 0.35 */
		state->dnxt.rolloff_val = CX24117_ROLLOFF_035;
		break;

	case SYS_DVBS2:
		dev_dbg(&state->priv->i2c->dev, "%s() demod%d DVB-S2\n",
			__func__, state->demod);

		/*
		 * NBC 8PSK/QPSK with DVB-S is supported for DVB-S2,
		 * but not hardware auto detection
		 */
		if (c->modulation != PSK_8 && c->modulation != QPSK) {
			dev_dbg(&state->priv->i2c->dev,
				"%s() demod%d unsupported modulation (%d)\n",
				__func__, state->demod, c->modulation);
			return -EOPNOTSUPP;
		}

		switch (c->pilot) {
		case PILOT_AUTO:
			state->dnxt.pilot_val = CX24117_PILOT_AUTO;
			break;
		case PILOT_OFF:
			state->dnxt.pilot_val = CX24117_PILOT_OFF;
			break;
		case PILOT_ON:
			state->dnxt.pilot_val = CX24117_PILOT_ON;
			break;
		default:
			dev_dbg(&state->priv->i2c->dev,
				"%s() demod%d unsupported pilot mode (%d)\n",
				__func__, state->demod, c->pilot);
			return -EOPNOTSUPP;
		}

		switch (c->rolloff) {
		case ROLLOFF_20:
			state->dnxt.rolloff_val = CX24117_ROLLOFF_020;
			break;
		case ROLLOFF_25:
			state->dnxt.rolloff_val = CX24117_ROLLOFF_025;
			break;
		case ROLLOFF_35:
			state->dnxt.rolloff_val = CX24117_ROLLOFF_035;
			break;
		case ROLLOFF_AUTO:
			state->dnxt.rolloff_val = CX24117_ROLLOFF_035;
			/* soft-auto rolloff */
			retune = 3;
			break;
		default:
			dev_warn(&state->priv->i2c->dev,
				"%s: demod%d unsupported rolloff (%d)\n",
				KBUILD_MODNAME, state->demod, c->rolloff);
			return -EOPNOTSUPP;
		}
		break;

	default:
		dev_warn(&state->priv->i2c->dev,
			"%s: demod %d unsupported delivery system (%d)\n",
			KBUILD_MODNAME, state->demod, c->delivery_system);
		return -EINVAL;
	}

	state->dnxt.delsys = c->delivery_system;
	state->dnxt.modulation = c->modulation;
	state->dnxt.frequency = c->frequency;
	state->dnxt.pilot = c->pilot;
	state->dnxt.rolloff = c->rolloff;

	ret = cx24117_set_inversion(state, c->inversion);
	if (ret !=  0)
		return ret;

	ret = cx24117_set_fec(state,
		c->delivery_system, c->modulation, c->fec_inner);
	if (ret !=  0)
		return ret;

	ret = cx24117_set_symbolrate(state, c->symbol_rate);
	if (ret !=  0)
		return ret;

	/* discard the 'current' tuning parameters and prepare to tune */
	cx24117_clone_params(fe);

	dev_dbg(&state->priv->i2c->dev,
		"%s: delsys      = %d\n", __func__, state->dcur.delsys);
	dev_dbg(&state->priv->i2c->dev,
		"%s: modulation  = %d\n", __func__, state->dcur.modulation);
	dev_dbg(&state->priv->i2c->dev,
		"%s: frequency   = %d\n", __func__, state->dcur.frequency);
	dev_dbg(&state->priv->i2c->dev,
		"%s: pilot       = %d (val = 0x%02x)\n", __func__,
		state->dcur.pilot, state->dcur.pilot_val);
	dev_dbg(&state->priv->i2c->dev,
		"%s: retune      = %d\n", __func__, retune);
	dev_dbg(&state->priv->i2c->dev,
		"%s: rolloff     = %d (val = 0x%02x)\n", __func__,
		state->dcur.rolloff, state->dcur.rolloff_val);
	dev_dbg(&state->priv->i2c->dev,
		"%s: symbol_rate = %d\n", __func__, state->dcur.symbol_rate);
	dev_dbg(&state->priv->i2c->dev,
		"%s: FEC         = %d (mask/val = 0x%02x/0x%02x)\n", __func__,
		state->dcur.fec, state->dcur.fec_mask, state->dcur.fec_val);
	dev_dbg(&state->priv->i2c->dev,
		"%s: Inversion   = %d (val = 0x%02x)\n", __func__,
		state->dcur.inversion, state->dcur.inversion_val);

	/* Prepare a tune request */
	cmd.args[0] = CMD_TUNEREQUEST;

	/* demod */
	cmd.args[1] = state->demod;

	/* Frequency */
	cmd.args[2] = (state->dcur.frequency & 0xff0000) >> 16;
	cmd.args[3] = (state->dcur.frequency & 0x00ff00) >> 8;
	cmd.args[4] = (state->dcur.frequency & 0x0000ff);

	/* Symbol Rate */
	cmd.args[5] = ((state->dcur.symbol_rate / 1000) & 0xff00) >> 8;
	cmd.args[6] = ((state->dcur.symbol_rate / 1000) & 0x00ff);

	/* Automatic Inversion */
	cmd.args[7] = state->dcur.inversion_val;

	/* Modulation / FEC / Pilot */
	cmd.args[8] = state->dcur.fec_val | state->dcur.pilot_val;

	cmd.args[9] = CX24117_SEARCH_RANGE_KHZ >> 8;
	cmd.args[10] = CX24117_SEARCH_RANGE_KHZ & 0xff;

	cmd.args[11] = state->dcur.rolloff_val;
	cmd.args[12] = state->dcur.fec_mask;

	if (state->dcur.symbol_rate > 30000000) {
		reg_ratediv = 0x04;
		reg_clkdiv = 0x02;
	} else if (state->dcur.symbol_rate > 10000000) {
		reg_ratediv = 0x06;
		reg_clkdiv = 0x03;
	} else {
		reg_ratediv = 0x0a;
		reg_clkdiv = 0x05;
	}

	cmd.args[13] = reg_ratediv;
	cmd.args[14] = reg_clkdiv;

	cx24117_writereg(state, (state->demod == 0) ?
		CX24117_REG_CLKDIV0 : CX24117_REG_CLKDIV1, reg_clkdiv);
	cx24117_writereg(state, (state->demod == 0) ?
		CX24117_REG_RATEDIV0 : CX24117_REG_RATEDIV1, reg_ratediv);

	cmd.args[15] = CX24117_PNE;
	cmd.len = 16;

	do {
		/* Reset status register */
		status = cx24117_readreg(state, (state->demod == 0) ?
			CX24117_REG_SSTATUS0 : CX24117_REG_SSTATUS1) &
			CX24117_SIGNAL_MASK;

		dev_dbg(&state->priv->i2c->dev,
			"%s() demod%d status_setfe = %02x\n",
			__func__, state->demod, status);

		cx24117_writereg(state, (state->demod == 0) ?
			CX24117_REG_SSTATUS0 : CX24117_REG_SSTATUS1, status);

		/* Tune */
		ret = cx24117_cmd_execute(fe, &cmd);
		if (ret != 0)
			break;

		/*
		 * Wait for up to 500 ms before retrying
		 *
		 * If we are able to tune then generally it occurs within 100ms.
		 * If it takes longer, try a different rolloff setting.
		 */
		for (i = 0; i < 50; i++) {
			cx24117_read_status(fe, &tunerstat);
			status = tunerstat & (FE_HAS_SIGNAL | FE_HAS_SYNC);
			if (status == (FE_HAS_SIGNAL | FE_HAS_SYNC)) {
				dev_dbg(&state->priv->i2c->dev,
					"%s() demod%d tuned\n",
					__func__, state->demod);
				return 0;
			}
			msleep(20);
		}

		dev_dbg(&state->priv->i2c->dev, "%s() demod%d not tuned\n",
			__func__, state->demod);

		/* try next rolloff value */
		if (state->dcur.rolloff == 3)
			cmd.args[11]--;

	} while (--retune);
	return -EINVAL;
}

static int cx24117_tune(struct dvb_frontend *fe, bool re_tune,
	unsigned int mode_flags, unsigned int *delay, fe_status_t *status)
{
	struct cx24117_state *state = fe->demodulator_priv;

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

	*delay = HZ / 5;
	if (re_tune) {
		int ret = cx24117_set_frontend(fe);
		if (ret)
			return ret;
	}
	return cx24117_read_status(fe, status);
}

static int cx24117_get_algo(struct dvb_frontend *fe)
{
	return DVBFE_ALGO_HW;
}

static int cx24117_get_frontend(struct dvb_frontend *fe)
{
	struct cx24117_state *state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24117_cmd cmd;
	u8 reg, st, inv;
	int ret, idx;
	unsigned int freq;
	short srate_os, freq_os;

	u8 buf[0x1f-4];

	cmd.args[0] = 0x1c;
	cmd.args[1] = (u8) state->demod;
	cmd.len = 2;
	ret = cx24117_cmd_execute(fe, &cmd);
	if (ret != 0)
		return ret;

	/* read all required regs at once */
	reg = (state->demod == 0) ? CX24117_REG_FREQ3_0 : CX24117_REG_FREQ3_1;
	ret = cx24117_readregN(state, reg, buf, 0x1f-4);
	if (ret != 0)
		return ret;

	st = buf[5];

	/* get spectral inversion */
	inv = (((state->demod == 0) ? ~st : st) >> 6) & 1;
	if (inv == 0)
		c->inversion = INVERSION_OFF;
	else
		c->inversion = INVERSION_ON;

	/* modulation and fec */
	idx = st & 0x3f;
	if (c->delivery_system == SYS_DVBS2) {
		if (idx > 11)
			idx += 9;
		else
			idx += 7;
	}

	c->modulation = cx24117_modfec_modes[idx].modulation;
	c->fec_inner = cx24117_modfec_modes[idx].fec;

	/* frequency */
	freq = (buf[0] << 16) | (buf[1] << 8) | buf[2];
	freq_os = (buf[8] << 8) | buf[9];
	c->frequency = freq + freq_os;

	/* symbol rate */
	srate_os = (buf[10] << 8) | buf[11];
	c->symbol_rate = -1000 * srate_os + state->dcur.symbol_rate;
	return 0;
}

static struct dvb_frontend_ops cx24117_ops = {
	.delsys = { SYS_DVBS, SYS_DVBS2 },
	.info = {
		.name = "Conexant CX24117/CX24132",
		.frequency_min = 950000,
		.frequency_max = 2150000,
		.frequency_stepsize = 1011, /* kHz for QPSK frontends */
		.frequency_tolerance = 5000,
		.symbol_rate_min = 1000000,
		.symbol_rate_max = 45000000,
		.caps = FE_CAN_INVERSION_AUTO |
			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
			FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
			FE_CAN_2G_MODULATION |
			FE_CAN_QPSK | FE_CAN_RECOVER
	},

	.release = cx24117_release,

	.init = cx24117_initfe,
	.sleep = cx24117_sleep,
	.read_status = cx24117_read_status,
	.read_ber = cx24117_read_ber,
	.read_signal_strength = cx24117_read_signal_strength,
	.read_snr = cx24117_read_snr,
	.read_ucblocks = cx24117_read_ucblocks,
	.set_tone = cx24117_set_tone,
	.set_voltage = cx24117_set_voltage,
	.diseqc_send_master_cmd = cx24117_send_diseqc_msg,
	.diseqc_send_burst = cx24117_diseqc_send_burst,
	.get_frontend_algo = cx24117_get_algo,
	.tune = cx24117_tune,

	.set_frontend = cx24117_set_frontend,
	.get_frontend = cx24117_get_frontend,
};


MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24117/cx24132 hardware");
MODULE_AUTHOR("Luis Alves (ljalvs@gmail.com)");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.1");
MODULE_FIRMWARE(CX24117_DEFAULT_FIRMWARE);