V4L/DVB (9017): Add support for Silicon Laboratories SI2109/2110 demodulators.

Add support for Silicon Laboratories SI2109/2110 demodulator
and cards with it, such as DvbWorld PCI2002.

Signed-off-by: Igor M. Liplianin <liplianin@me.by>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 974 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/si21xx.c b/drivers/media/dvb/frontends/si21xx.c
new file mode 100644
index 00000000000..3ddbe69c45c
--- /dev/null
+++ b/drivers/media/dvb/frontends/si21xx.c
@@ -0,0 +1,974 @@
+/* DVB compliant Linux driver for the DVB-S si2109/2110 demodulator
+*
+* Copyright (C) 2008 Igor M. Liplianin (liplianin@me.by)
+*
+*	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.
+*
+*/
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <asm/div64.h>
+
+#include "dvb_frontend.h"
+#include "si21xx.h"
+
+#define	REVISION_REG			0x00
+#define	SYSTEM_MODE_REG			0x01
+#define	TS_CTRL_REG_1			0x02
+#define	TS_CTRL_REG_2			0x03
+#define	PIN_CTRL_REG_1			0x04
+#define	PIN_CTRL_REG_2			0x05
+#define	LOCK_STATUS_REG_1		0x0f
+#define	LOCK_STATUS_REG_2		0x10
+#define	ACQ_STATUS_REG			0x11
+#define	ACQ_CTRL_REG_1			0x13
+#define	ACQ_CTRL_REG_2			0x14
+#define	PLL_DIVISOR_REG			0x15
+#define	COARSE_TUNE_REG			0x16
+#define	FINE_TUNE_REG_L			0x17
+#define	FINE_TUNE_REG_H			0x18
+
+#define	ANALOG_AGC_POWER_LEVEL_REG	0x28
+#define	CFO_ESTIMATOR_CTRL_REG_1	0x29
+#define	CFO_ESTIMATOR_CTRL_REG_2	0x2a
+#define	CFO_ESTIMATOR_CTRL_REG_3	0x2b
+
+#define	SYM_RATE_ESTIMATE_REG_L		0x31
+#define	SYM_RATE_ESTIMATE_REG_M		0x32
+#define	SYM_RATE_ESTIMATE_REG_H		0x33
+
+#define	CFO_ESTIMATOR_OFFSET_REG_L	0x36
+#define	CFO_ESTIMATOR_OFFSET_REG_H	0x37
+#define	CFO_ERROR_REG_L			0x38
+#define	CFO_ERROR_REG_H			0x39
+#define	SYM_RATE_ESTIMATOR_CTRL_REG	0x3a
+
+#define	SYM_RATE_REG_L			0x3f
+#define	SYM_RATE_REG_M			0x40
+#define	SYM_RATE_REG_H			0x41
+#define	SYM_RATE_ESTIMATOR_MAXIMUM_REG	0x42
+#define	SYM_RATE_ESTIMATOR_MINIMUM_REG	0x43
+
+#define	C_N_ESTIMATOR_CTRL_REG		0x7c
+#define	C_N_ESTIMATOR_THRSHLD_REG	0x7d
+#define	C_N_ESTIMATOR_LEVEL_REG_L	0x7e
+#define	C_N_ESTIMATOR_LEVEL_REG_H	0x7f
+
+#define	BLIND_SCAN_CTRL_REG		0x80
+
+#define	LSA_CTRL_REG_1			0x8D
+#define	SPCTRM_TILT_CORR_THRSHLD_REG	0x8f
+#define	ONE_DB_BNDWDTH_THRSHLD_REG	0x90
+#define	TWO_DB_BNDWDTH_THRSHLD_REG	0x91
+#define	THREE_DB_BNDWDTH_THRSHLD_REG	0x92
+#define	INBAND_POWER_THRSHLD_REG	0x93
+#define	REF_NOISE_LVL_MRGN_THRSHLD_REG	0x94
+
+#define	VIT_SRCH_CTRL_REG_1		0xa0
+#define	VIT_SRCH_CTRL_REG_2		0xa1
+#define	VIT_SRCH_CTRL_REG_3		0xa2
+#define	VIT_SRCH_STATUS_REG		0xa3
+#define	VITERBI_BER_COUNT_REG_L		0xab
+#define	REED_SOLOMON_CTRL_REG		0xb0
+#define	REED_SOLOMON_ERROR_COUNT_REG_L	0xb1
+#define	PRBS_CTRL_REG			0xb5
+
+#define	LNB_CTRL_REG_1			0xc0
+#define	LNB_CTRL_REG_2			0xc1
+#define	LNB_CTRL_REG_3			0xc2
+#define	LNB_CTRL_REG_4			0xc3
+#define	LNB_CTRL_STATUS_REG		0xc4
+#define	LNB_FIFO_REGS_0			0xc5
+#define	LNB_FIFO_REGS_1			0xc6
+#define	LNB_FIFO_REGS_2			0xc7
+#define	LNB_FIFO_REGS_3			0xc8
+#define	LNB_FIFO_REGS_4			0xc9
+#define	LNB_FIFO_REGS_5			0xca
+#define	LNB_SUPPLY_CTRL_REG_1		0xcb
+#define	LNB_SUPPLY_CTRL_REG_2		0xcc
+#define	LNB_SUPPLY_CTRL_REG_3		0xcd
+#define	LNB_SUPPLY_CTRL_REG_4		0xce
+#define	LNB_SUPPLY_STATUS_REG		0xcf
+
+#define FALSE	0
+#define TRUE	1
+#define FAIL	-1
+#define PASS	0
+
+#define ALLOWABLE_FS_COUNT	10
+#define STATUS_BER		0
+#define STATUS_UCBLOCKS		1
+
+static int debug;
+#define dprintk(args...) \
+	do { \
+		if (debug) \
+			printk(KERN_DEBUG "si21xx: " args); \
+	} while (0)
+
+enum {
+	ACTIVE_HIGH,
+	ACTIVE_LOW
+};
+enum {
+	BYTE_WIDE,
+	BIT_WIDE
+};
+enum {
+	CLK_GAPPED_MODE,
+	CLK_CONTINUOUS_MODE
+};
+enum {
+	RISING_EDGE,
+	FALLING_EDGE
+};
+enum {
+	MSB_FIRST,
+	LSB_FIRST
+};
+enum {
+	SERIAL,
+	PARALLEL
+};
+
+struct si21xx_state {
+	struct i2c_adapter *i2c;
+	const struct si21xx_config *config;
+	struct dvb_frontend frontend;
+	u8 initialised:1;
+	int errmode;
+	int fs;			/*Sampling rate of the ADC in MHz*/
+};
+
+/*	register default initialization */
+static u8 serit_sp1511lhb_inittab[] = {
+	0x01, 0x28,	/* set i2c_inc_disable */
+	0x20, 0x03,
+	0x27, 0x20,
+	0xe0, 0x45,
+	0xe1, 0x08,
+	0xfe, 0x01,
+	0x01, 0x28,
+	0x89, 0x09,
+	0x04, 0x80,
+	0x05, 0x01,
+	0x06, 0x00,
+	0x20, 0x03,
+	0x24, 0x88,
+	0x29, 0x09,
+	0x2a, 0x0f,
+	0x2c, 0x10,
+	0x2d, 0x19,
+	0x2e, 0x08,
+	0x2f, 0x10,
+	0x30, 0x19,
+	0x34, 0x20,
+	0x35, 0x03,
+	0x45, 0x02,
+	0x46, 0x45,
+	0x47, 0xd0,
+	0x48, 0x00,
+	0x49, 0x40,
+	0x4a, 0x03,
+	0x4c, 0xfd,
+	0x4f, 0x2e,
+	0x50, 0x2e,
+	0x51, 0x10,
+	0x52, 0x10,
+	0x56, 0x92,
+	0x59, 0x00,
+	0x5a, 0x2d,
+	0x5b, 0x33,
+	0x5c, 0x1f,
+	0x5f, 0x76,
+	0x62, 0xc0,
+	0x63, 0xc0,
+	0x64, 0xf3,
+	0x65, 0xf3,
+	0x79, 0x40,
+	0x6a, 0x40,
+	0x6b, 0x0a,
+	0x6c, 0x80,
+	0x6d, 0x27,
+	0x71, 0x06,
+	0x75, 0x60,
+	0x78, 0x00,
+	0x79, 0xb5,
+	0x7c, 0x05,
+	0x7d, 0x1a,
+	0x87, 0x55,
+	0x88, 0x72,
+	0x8f, 0x08,
+	0x90, 0xe0,
+	0x94, 0x40,
+	0xa0, 0x3f,
+	0xa1, 0xc0,
+	0xa4, 0xcc,
+	0xa5, 0x66,
+	0xa6, 0x66,
+	0xa7, 0x7b,
+	0xa8, 0x7b,
+	0xa9, 0x7b,
+	0xaa, 0x9a,
+	0xed, 0x04,
+	0xad, 0x00,
+	0xae, 0x03,
+	0xcc, 0xab,
+	0x01, 0x08,
+	0xff, 0xff
+};
+
+/*	low level read/writes */
+static int si21_writeregs(struct si21xx_state *state, u8 reg1,
+							u8 *data, int len)
+{
+	int ret;
+	u8 buf[60];/* = { reg1, data };*/
+	struct i2c_msg msg = {
+				.addr = state->config->demod_address,
+				.flags = 0,
+				.buf = buf,
+				.len = len + 1
+	};
+
+	msg.buf[0] =  reg1;
+	memcpy(msg.buf + 1, data, len);
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+
+	if (ret != 1)
+		dprintk("%s: writereg error (reg1 == 0x%02x, data == 0x%02x, "
+			"ret == %i)\n", __func__, reg1, data[0], ret);
+
+	return (ret != 1) ? -EREMOTEIO : 0;
+}
+
+static int si21_writereg(struct si21xx_state *state, u8 reg, u8 data)
+{
+	int ret;
+	u8 buf[] = { reg, data };
+	struct i2c_msg msg = {
+				.addr = state->config->demod_address,
+				.flags = 0,
+				.buf = buf,
+				.len = 2
+	};
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+
+	if (ret != 1)
+		dprintk("%s: writereg error (reg == 0x%02x, data == 0x%02x, "
+			"ret == %i)\n", __func__, reg, data, ret);
+
+	return (ret != 1) ? -EREMOTEIO : 0;
+}
+
+static int si21_write(struct dvb_frontend *fe, u8 *buf, int len)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	if (len != 2)
+		return -EINVAL;
+
+	return si21_writereg(state, buf[0], buf[1]);
+}
+
+static u8 si21_readreg(struct si21xx_state *state, u8 reg)
+{
+	int ret;
+	u8 b0[] = { reg };
+	u8 b1[] = { 0 };
+	struct i2c_msg msg[] = {
+		{
+			.addr = state->config->demod_address,
+			.flags = 0,
+			.buf = b0,
+			.len = 1
+		}, {
+			.addr = state->config->demod_address,
+			.flags = I2C_M_RD,
+			.buf = b1,
+			.len = 1
+		}
+	};
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2)
+		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
+			__func__, reg, ret);
+
+	return b1[0];
+}
+
+static int si21_readregs(struct si21xx_state *state, u8 reg1, u8 *b, u8 len)
+{
+	int ret;
+	struct i2c_msg msg[] = {
+		{
+			.addr = state->config->demod_address,
+			.flags = 0,
+			.buf = &reg1,
+			.len = 1
+		}, {
+			.addr = state->config->demod_address,
+			.flags = I2C_M_RD,
+			.buf = b,
+			.len = len
+		}
+	};
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2)
+		dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
+
+	return ret == 2 ? 0 : -1;
+}
+
+static int si21xx_wait_diseqc_idle(struct si21xx_state *state, int timeout)
+{
+	unsigned long start = jiffies;
+
+	dprintk("%s\n", __func__);
+
+	while ((si21_readreg(state, LNB_CTRL_REG_1) & 0x8) == 8) {
+		if (jiffies - start > timeout) {
+			dprintk("%s: timeout!!\n", __func__);
+			return -ETIMEDOUT;
+		}
+		msleep(10);
+	};
+
+	return 0;
+}
+
+static int si21xx_set_symbolrate(struct dvb_frontend *fe, u32 srate)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u32 sym_rate, data_rate;
+	int i;
+	u8 sym_rate_bytes[3];
+
+	dprintk("%s : srate = %i\n", __func__ , srate);
+
+	if ((srate < 1000000) || (srate > 45000000))
+		return -EINVAL;
+
+	data_rate = srate;
+	sym_rate = 0;
+
+	for (i = 0; i < 4; ++i) {
+		sym_rate /= 100;
+		sym_rate = sym_rate + ((data_rate % 100) * 0x800000) /
+								state->fs;
+		data_rate /= 100;
+	}
+	for (i = 0; i < 3; ++i)
+		sym_rate_bytes[i] = (u8)((sym_rate >> (i * 8)) & 0xff);
+
+	si21_writeregs(state, SYM_RATE_REG_L, sym_rate_bytes, 0x03);
+
+	return 0;
+}
+
+static int si21xx_send_diseqc_msg(struct dvb_frontend *fe,
+					struct dvb_diseqc_master_cmd *m)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 lnb_status;
+	u8 LNB_CTRL_1;
+	int status;
+
+	dprintk("%s\n", __func__);
+
+	status = PASS;
+	LNB_CTRL_1 = 0;
+
+	status |= si21_readregs(state, LNB_CTRL_STATUS_REG, &lnb_status, 0x01);
+	status |= si21_readregs(state, LNB_CTRL_REG_1, &lnb_status, 0x01);
+
+	/*fill the FIFO*/
+	status |= si21_writeregs(state, LNB_FIFO_REGS_0, m->msg, m->msg_len);
+
+	LNB_CTRL_1 = (lnb_status & 0x70);
+	LNB_CTRL_1 |= m->msg_len;
+
+	LNB_CTRL_1 |= 0x80;	/* begin LNB signaling */
+
+	status |= si21_writeregs(state, LNB_CTRL_REG_1, &LNB_CTRL_1, 0x01);
+
+	return status;
+}
+
+static int si21xx_send_diseqc_burst(struct dvb_frontend *fe,
+						fe_sec_mini_cmd_t burst)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 val;
+
+	dprintk("%s\n", __func__);
+
+	if (si21xx_wait_diseqc_idle(state, 100) < 0)
+		return -ETIMEDOUT;
+
+	val = (0x80 | si21_readreg(state, 0xc1));
+	if (si21_writereg(state, LNB_CTRL_REG_1,
+			burst == SEC_MINI_A ? (val & ~0x10) : (val | 0x10)))
+		return -EREMOTEIO;
+
+	if (si21xx_wait_diseqc_idle(state, 100) < 0)
+		return -ETIMEDOUT;
+
+	if (si21_writereg(state, LNB_CTRL_REG_1, val))
+		return -EREMOTEIO;
+
+	return 0;
+}
+/*	30.06.2008 */
+static int si21xx_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 val;
+
+	dprintk("%s\n", __func__);
+	val = (0x80 | si21_readreg(state, LNB_CTRL_REG_1));
+
+	switch (tone) {
+	case SEC_TONE_ON:
+		return si21_writereg(state, LNB_CTRL_REG_1, val | 0x20);
+
+	case SEC_TONE_OFF:
+		return si21_writereg(state, LNB_CTRL_REG_1, (val & ~0x20));
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int si21xx_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t volt)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	u8 val;
+	dprintk("%s: %s\n", __func__,
+		volt == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
+		volt == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" : "??");
+
+
+	val = (0x80 | si21_readreg(state, LNB_CTRL_REG_1));
+
+	switch (volt) {
+	case SEC_VOLTAGE_18:
+		return si21_writereg(state, LNB_CTRL_REG_1, val | 0x40);
+		break;
+	case SEC_VOLTAGE_13:
+		return si21_writereg(state, LNB_CTRL_REG_1, (val & ~0x40));
+		break;
+	default:
+		return -EINVAL;
+	};
+}
+
+static int si21xx_init(struct dvb_frontend *fe)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	int i;
+	int status = 0;
+	u8 reg1;
+	u8 val;
+	u8 reg2[2];
+
+	dprintk("%s\n", __func__);
+
+	for (i = 0; ; i += 2) {
+		reg1 = serit_sp1511lhb_inittab[i];
+		val = serit_sp1511lhb_inittab[i+1];
+		if (reg1 == 0xff && val == 0xff)
+			break;
+		si21_writeregs(state, reg1, &val, 1);
+	}
+
+	/*DVB QPSK SYSTEM MODE REG*/
+	reg1 = 0x08;
+	si21_writeregs(state, SYSTEM_MODE_REG, &reg1, 0x01);
+
+	/*transport stream config*/
+	/*
+	mode = PARALLEL;
+	sdata_form = LSB_FIRST;
+	clk_edge = FALLING_EDGE;
+	clk_mode = CLK_GAPPED_MODE;
+	strt_len = BYTE_WIDE;
+	sync_pol = ACTIVE_HIGH;
+	val_pol = ACTIVE_HIGH;
+	err_pol = ACTIVE_HIGH;
+	sclk_rate = 0x00;
+	parity = 0x00 ;
+	data_delay = 0x00;
+	clk_delay = 0x00;
+	pclk_smooth = 0x00;
+	*/
+	reg2[0] =
+		PARALLEL + (LSB_FIRST << 1)
+		+ (FALLING_EDGE << 2) + (CLK_GAPPED_MODE << 3)
+		+ (BYTE_WIDE << 4) + (ACTIVE_HIGH << 5)
+		+ (ACTIVE_HIGH << 6) + (ACTIVE_HIGH << 7);
+
+	reg2[1] = 0;
+	/*	sclk_rate + (parity << 2)
+		+ (data_delay << 3) + (clk_delay << 4)
+		+ (pclk_smooth << 5);
+	*/
+	status |= si21_writeregs(state, TS_CTRL_REG_1, reg2, 0x02);
+	if (status != 0)
+		dprintk(" %s : TS Set Error\n", __func__);
+
+	return 0;
+
+}
+
+static int si21_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 regs_read[2];
+	u8 reg_read;
+	u8 i;
+	u8 lock;
+	u8 signal = si21_readreg(state, ANALOG_AGC_POWER_LEVEL_REG);
+
+	si21_readregs(state, LOCK_STATUS_REG_1, regs_read, 0x02);
+	reg_read = 0;
+
+	for (i = 0; i < 7; ++i)
+		reg_read |= ((regs_read[0] >> i) & 0x01) << (6 - i);
+
+	lock = ((reg_read & 0x7f) | (regs_read[1] & 0x80));
+
+	dprintk("%s : FE_READ_STATUS : VSTATUS: 0x%02x\n", __func__, lock);
+	*status = 0;
+
+	if (signal > 10)
+		*status |= FE_HAS_SIGNAL;
+
+	if (lock & 0x2)
+		*status |= FE_HAS_CARRIER;
+
+	if (lock & 0x20)
+		*status |= FE_HAS_VITERBI;
+
+	if (lock & 0x40)
+		*status |= FE_HAS_SYNC;
+
+	if ((lock & 0x7b) == 0x7b)
+		*status |= FE_HAS_LOCK;
+
+	return 0;
+}
+
+static int si21_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	/*status = si21_readreg(state, ANALOG_AGC_POWER_LEVEL_REG,
+						(u8*)agclevel, 0x01);*/
+
+	u16 signal = (3 * si21_readreg(state, 0x27) *
+					si21_readreg(state, 0x28));
+
+	dprintk("%s : AGCPWR: 0x%02x%02x, signal=0x%04x\n", __func__,
+		si21_readreg(state, 0x27),
+		si21_readreg(state, 0x28), (int) signal);
+
+	signal  <<= 4;
+	*strength = signal;
+
+	return 0;
+}
+
+static int si21_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	dprintk("%s\n", __func__);
+
+	if (state->errmode != STATUS_BER)
+		return 0;
+
+	*ber = (si21_readreg(state, 0x1d) << 8) |
+				si21_readreg(state, 0x1e);
+
+	return 0;
+}
+
+static int si21_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	s32 xsnr = 0xffff - ((si21_readreg(state, 0x24) << 8) |
+					si21_readreg(state, 0x25));
+	xsnr = 3 * (xsnr - 0xa100);
+	*snr = (xsnr > 0xffff) ? 0xffff : (xsnr < 0) ? 0 : xsnr;
+
+	dprintk("%s\n", __func__);
+
+	return 0;
+}
+
+static int si21_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	dprintk("%s\n", __func__);
+
+	if (state->errmode != STATUS_UCBLOCKS)
+		*ucblocks = 0;
+	else
+		*ucblocks = (si21_readreg(state, 0x1d) << 8) |
+					si21_readreg(state, 0x1e);
+
+	return 0;
+}
+
+/*	initiates a channel acquisition sequence
+	using the specified symbol rate and code rate */
+static int si21xx_setacquire(struct dvb_frontend *fe, int symbrate,
+						fe_code_rate_t crate)
+{
+
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 coderates[] = {
+				0x0, 0x01, 0x02, 0x04, 0x00,
+				0x8, 0x10, 0x20, 0x00, 0x3f
+	};
+
+	u8 coderate_ptr;
+	int status;
+	u8 start_acq = 0x80;
+	u8 reg, regs[3];
+
+	dprintk("%s\n", __func__);
+
+	status = PASS;
+	coderate_ptr = coderates[crate];
+
+	si21xx_set_symbolrate(fe, symbrate);
+
+	/* write code rates to use in the Viterbi search */
+	status |= si21_writeregs(state,
+				VIT_SRCH_CTRL_REG_1,
+				&coderate_ptr, 0x01);
+
+	/* clear acq_start bit */
+	status |= si21_readregs(state, ACQ_CTRL_REG_2, &reg, 0x01);
+	reg &= ~start_acq;
+	status |= si21_writeregs(state, ACQ_CTRL_REG_2, &reg, 0x01);
+
+	/* use new Carrier Frequency Offset Estimator (QuickLock) */
+	regs[0] = 0xCB;
+	regs[1] = 0x40;
+	regs[2] = 0xCB;
+
+	status |= si21_writeregs(state,
+				TWO_DB_BNDWDTH_THRSHLD_REG,
+				&regs[0], 0x03);
+	reg = 0x56;
+	status |= si21_writeregs(state,
+				LSA_CTRL_REG_1, &reg, 1);
+	reg = 0x05;
+	status |= si21_writeregs(state,
+				BLIND_SCAN_CTRL_REG, &reg, 1);
+	/* start automatic acq */
+	status |= si21_writeregs(state,
+				ACQ_CTRL_REG_2, &start_acq, 0x01);
+
+	return status;
+}
+
+static int si21xx_set_property(struct dvb_frontend *fe, struct dtv_property *p)
+{
+	dprintk("%s(..)\n", __func__);
+	return 0;
+}
+
+static int si21xx_get_property(struct dvb_frontend *fe, struct dtv_property *p)
+{
+	dprintk("%s(..)\n", __func__);
+	return 0;
+}
+
+static int si21xx_set_frontend(struct dvb_frontend *fe,
+					struct dvb_frontend_parameters *dfp)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	/* freq		Channel carrier frequency in KHz (i.e. 1550000 KHz)
+	 datarate	Channel symbol rate in Sps (i.e. 22500000 Sps)*/
+
+	/* in MHz */
+	unsigned char coarse_tune_freq;
+	int fine_tune_freq;
+	unsigned char sample_rate = 0;
+	/* boolean */
+	unsigned int inband_interferer_ind;
+
+	/* INTERMEDIATE VALUES */
+	int icoarse_tune_freq; /* MHz */
+	int ifine_tune_freq; /* MHz */
+	unsigned int band_high;
+	unsigned int band_low;
+	unsigned int x1;
+	unsigned int x2;
+	int i;
+	unsigned int inband_interferer_div2[ALLOWABLE_FS_COUNT] = {
+			FALSE, FALSE, FALSE, FALSE, FALSE,
+			FALSE, FALSE, FALSE, FALSE, FALSE
+	};
+	unsigned int inband_interferer_div4[ALLOWABLE_FS_COUNT] = {
+			FALSE, FALSE, FALSE, FALSE, FALSE,
+			FALSE, FALSE, FALSE, FALSE, FALSE
+	};
+
+	int status;
+
+	/* allowable sample rates for ADC in MHz */
+	int afs[ALLOWABLE_FS_COUNT] = { 200, 192, 193, 194, 195,
+					196, 204, 205, 206, 207
+	};
+	/* in MHz */
+	int if_limit_high;
+	int if_limit_low;
+	int lnb_lo;
+	int lnb_uncertanity;
+
+	int rf_freq;
+	int data_rate;
+	unsigned char regs[4];
+
+	dprintk("%s : FE_SET_FRONTEND\n", __func__);
+
+	if (c->delivery_system != SYS_DVBS) {
+			dprintk("%s: unsupported delivery system selected (%d)\n",
+				__func__, c->delivery_system);
+			return -EOPNOTSUPP;
+	}
+
+	for (i = 0; i < ALLOWABLE_FS_COUNT; ++i)
+		inband_interferer_div2[i] = inband_interferer_div4[i] = FALSE;
+
+	if_limit_high = -700000;
+	if_limit_low = -100000;
+	/* in MHz */
+	lnb_lo = 0;
+	lnb_uncertanity = 0;
+
+	rf_freq = 10 * c->frequency ;
+	data_rate = c->symbol_rate / 100;
+
+	status = PASS;
+
+	band_low = (rf_freq - lnb_lo) - ((lnb_uncertanity * 200)
+					+ (data_rate * 135)) / 200;
+
+	band_high = (rf_freq - lnb_lo) + ((lnb_uncertanity * 200)
+					+ (data_rate * 135)) / 200;
+
+
+	icoarse_tune_freq = 100000 *
+				(((rf_freq - lnb_lo) -
+					(if_limit_low + if_limit_high) / 2)
+								/ 100000);
+
+	ifine_tune_freq = (rf_freq - lnb_lo) - icoarse_tune_freq ;
+
+	for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
+		x1 = ((rf_freq - lnb_lo) / (afs[i] * 2500)) *
+					(afs[i] * 2500) + afs[i] * 2500;
+
+		x2 = ((rf_freq - lnb_lo) / (afs[i] * 2500)) *
+							(afs[i] * 2500);
+
+		if (((band_low < x1) && (x1 < band_high)) ||
+					((band_low < x2) && (x2 < band_high)))
+					inband_interferer_div4[i] = TRUE;
+
+	}
+
+	for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
+		x1 = ((rf_freq - lnb_lo) / (afs[i] * 5000)) *
+					(afs[i] * 5000) + afs[i] * 5000;
+
+		x2 = ((rf_freq - lnb_lo) / (afs[i] * 5000)) *
+					(afs[i] * 5000);
+
+		if (((band_low < x1) && (x1 < band_high)) ||
+					((band_low < x2) && (x2 < band_high)))
+					inband_interferer_div2[i] = TRUE;
+	}
+
+	inband_interferer_ind = TRUE;
+	for (i = 0; i < ALLOWABLE_FS_COUNT; ++i)
+		inband_interferer_ind &= inband_interferer_div2[i] |
+						inband_interferer_div4[i];
+
+	if (inband_interferer_ind) {
+		for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
+			if (inband_interferer_div2[i] == FALSE) {
+				sample_rate = (u8) afs[i];
+				break;
+			}
+		}
+	} else {
+		for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
+			if ((inband_interferer_div2[i] |
+					inband_interferer_div4[i]) == FALSE) {
+				sample_rate = (u8) afs[i];
+				break;
+			}
+		}
+
+	}
+
+	if (sample_rate > 207 || sample_rate < 192)
+		sample_rate = 200;
+
+	fine_tune_freq = ((0x4000 * (ifine_tune_freq / 10)) /
+					((sample_rate) * 1000));
+
+	coarse_tune_freq = (u8)(icoarse_tune_freq / 100000);
+
+	regs[0] = sample_rate;
+	regs[1] = coarse_tune_freq;
+	regs[2] = fine_tune_freq & 0xFF;
+	regs[3] = fine_tune_freq >> 8 & 0xFF;
+
+	status |= si21_writeregs(state, PLL_DIVISOR_REG, &regs[0], 0x04);
+
+	state->fs = sample_rate;/*ADC MHz*/
+	si21xx_setacquire(fe, c->symbol_rate, c->fec_inner);
+
+	return 0;
+}
+
+static int si21xx_sleep(struct dvb_frontend *fe)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+	u8 regdata;
+
+	dprintk("%s\n", __func__);
+
+	si21_readregs(state, SYSTEM_MODE_REG, &regdata, 0x01);
+	regdata |= 1 << 6;
+	si21_writeregs(state, SYSTEM_MODE_REG, &regdata, 0x01);
+	state->initialised = 0;
+
+	return 0;
+}
+
+static void si21xx_release(struct dvb_frontend *fe)
+{
+	struct si21xx_state *state = fe->demodulator_priv;
+
+	dprintk("%s\n", __func__);
+
+	kfree(state);
+}
+
+static struct dvb_frontend_ops si21xx_ops = {
+
+	.info = {
+		.name			= "SL SI21XX DVB-S",
+		.type			= FE_QPSK,
+		.frequency_min		= 950000,
+		.frequency_max		= 2150000,
+		.frequency_stepsize	= 125,	 /* kHz for QPSK frontends */
+		.frequency_tolerance	= 0,
+		.symbol_rate_min	= 1000000,
+		.symbol_rate_max	= 45000000,
+		.symbol_rate_tolerance	= 500,	/* ppm */
+		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+		FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
+		FE_CAN_QPSK |
+		FE_CAN_FEC_AUTO
+	},
+
+	.release = si21xx_release,
+	.init = si21xx_init,
+	.sleep = si21xx_sleep,
+	.write = si21_write,
+	.read_status = si21_read_status,
+	.read_ber = si21_read_ber,
+	.read_signal_strength = si21_read_signal_strength,
+	.read_snr = si21_read_snr,
+	.read_ucblocks = si21_read_ucblocks,
+	.diseqc_send_master_cmd = si21xx_send_diseqc_msg,
+	.diseqc_send_burst = si21xx_send_diseqc_burst,
+	.set_tone = si21xx_set_tone,
+	.set_voltage = si21xx_set_voltage,
+
+	.set_property = si21xx_set_property,
+	.get_property = si21xx_get_property,
+	.set_frontend = si21xx_set_frontend,
+};
+
+struct dvb_frontend *si21xx_attach(const struct si21xx_config *config,
+						struct i2c_adapter *i2c)
+{
+	struct si21xx_state *state = NULL;
+	int id;
+
+	dprintk("%s\n", __func__);
+
+	/* allocate memory for the internal state */
+	state = kmalloc(sizeof(struct si21xx_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+
+	/* setup the state */
+	state->config = config;
+	state->i2c = i2c;
+	state->initialised = 0;
+	state->errmode = STATUS_BER;
+
+	/* check if the demod is there */
+	id = si21_readreg(state, SYSTEM_MODE_REG);
+	si21_writereg(state, SYSTEM_MODE_REG, id | 0x40); /* standby off */
+	msleep(200);
+	id = si21_readreg(state, 0x00);
+
+	/* register 0x00 contains:
+		0x34 for SI2107
+		0x24 for SI2108
+		0x14 for SI2109
+		0x04 for SI2110
+	*/
+	if (id != 0x04 && id != 0x14)
+		goto error;
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &si21xx_ops,
+					sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+	return &state->frontend;
+
+error:
+	kfree(state);
+	return NULL;
+}
+EXPORT_SYMBOL(si21xx_attach);
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("SL SI21XX DVB Demodulator driver");
+MODULE_AUTHOR("Igor M. Liplianin");
+MODULE_LICENSE("GPL");