drivers/media/dvb-frontends/tda8083.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
     Driver for Philips TDA8083 based QPSK Demodulator

     Copyright (C) 2001 Convergence Integrated Media GmbH

     written by Ralph Metzler <ralph@convergence.de>

     adoption to the new DVB frontend API and diagnostic ioctl's
     by Holger Waechtler <holger@convergence.de>


 */

 #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 <media/dvb_frontend.h>
 #include "tda8083.h"


 struct tda8083_state {
 	struct i2c_adapter* i2c;
 	/* configuration settings */
 	const struct tda8083_config* config;
 	struct dvb_frontend frontend;
 };

 static int debug;
 #define dprintk(args...) \
 	do { \
 		if (debug) printk(KERN_DEBUG "tda8083: " args); \
 	} while (0)


 static u8 tda8083_init_tab [] = {
 	0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
 	0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
 	0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
 	0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
 	0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00
 };


 static int tda8083_writereg (struct tda8083_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 %02x, ret == %i)\n",
 			__func__, reg, ret);

 	return (ret != 1) ? -1 : 0;
 }

 static int tda8083_readregs (struct tda8083_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 (reg %02x, ret == %i)\n",
 			__func__, reg1, ret);

 	return ret == 2 ? 0 : -1;
 }

 static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
 {
 	u8 val;

 	tda8083_readregs (state, reg, &val, 1);

 	return val;
 }

 static int tda8083_set_inversion(struct tda8083_state *state,
 				 enum fe_spectral_inversion inversion)
 {
 	/*  XXX FIXME: implement other modes than FEC_AUTO */
 	if (inversion == INVERSION_AUTO)
 		return 0;

 	return -EINVAL;
 }

 static int tda8083_set_fec(struct tda8083_state *state, enum fe_code_rate fec)
 {
 	if (fec == FEC_AUTO)
 		return tda8083_writereg (state, 0x07, 0xff);

 	if (fec >= FEC_1_2 && fec <= FEC_8_9)
 		return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));

 	return -EINVAL;
 }

 static enum fe_code_rate tda8083_get_fec(struct tda8083_state *state)
 {
 	u8 index;
 	static enum fe_code_rate fec_tab[] = {
 		FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 		FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8
 	};

 	index = tda8083_readreg(state, 0x0e) & 0x07;

 	return fec_tab [index];
 }

 static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
 {
 	u32 ratio;
 	u32 tmp;
 	u8 filter;

 	if (srate > 32000000)
 		srate = 32000000;
 	if (srate < 500000)
 		srate = 500000;

 	filter = 0;
 	if (srate < 24000000)
 		filter = 2;
 	if (srate < 16000000)
 		filter = 3;

 	tmp = 31250 << 16;
 	ratio = tmp / srate;

 	tmp = (tmp % srate) << 8;
 	ratio = (ratio << 8) + tmp / srate;

 	tmp = (tmp % srate) << 8;
 	ratio = (ratio << 8) + tmp / srate;

 	dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);

 	tda8083_writereg (state, 0x05, filter);
 	tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
 	tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
 	tda8083_writereg (state, 0x04, (ratio      ) & 0xff);

 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 1;
 }

 static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
 {
 	unsigned long start = jiffies;

 	while (jiffies - start < timeout &&
 	       !(tda8083_readreg(state, 0x02) & 0x80))
 	{
 		msleep(50);
 	}
 }

 static int tda8083_set_tone(struct tda8083_state *state,
 			    enum fe_sec_tone_mode tone)
 {
 	tda8083_writereg (state, 0x26, 0xf1);

 	switch (tone) {
 	case SEC_TONE_OFF:
 		return tda8083_writereg (state, 0x29, 0x00);
 	case SEC_TONE_ON:
 		return tda8083_writereg (state, 0x29, 0x80);
 	default:
 		return -EINVAL;
 	}
 }

 static int tda8083_set_voltage(struct tda8083_state *state,
 			       enum fe_sec_voltage voltage)
 {
 	switch (voltage) {
 	case SEC_VOLTAGE_13:
 		return tda8083_writereg (state, 0x20, 0x00);
 	case SEC_VOLTAGE_18:
 		return tda8083_writereg (state, 0x20, 0x11);
 	default:
 		return -EINVAL;
 	}
 }

 static int tda8083_send_diseqc_burst(struct tda8083_state *state,
 				     enum fe_sec_mini_cmd burst)
 {
 	switch (burst) {
 	case SEC_MINI_A:
 		tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
 		break;
 	case SEC_MINI_B:
 		tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
 		break;
 	default:
 		return -EINVAL;
 	}

 	tda8083_wait_diseqc_fifo (state, 100);

 	return 0;
 }

 static int tda8083_send_diseqc_msg(struct dvb_frontend *fe,
 				   struct dvb_diseqc_master_cmd *m)
 {
 	struct tda8083_state* state = fe->demodulator_priv;
 	int i;

 	tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */

 	for (i=0; i<m->msg_len; i++)
 		tda8083_writereg (state, 0x23 + i, m->msg[i]);

 	tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */

 	tda8083_wait_diseqc_fifo (state, 100);

 	return 0;
 }

 static int tda8083_read_status(struct dvb_frontend *fe,
 			       enum fe_status *status)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	u8 signal = ~tda8083_readreg (state, 0x01);
 	u8 sync = tda8083_readreg (state, 0x02);

 	*status = 0;

 	if (signal > 10)
 		*status |= FE_HAS_SIGNAL;

 	if (sync & 0x01)
 		*status |= FE_HAS_CARRIER;

 	if (sync & 0x02)
 		*status |= FE_HAS_VITERBI;

 	if (sync & 0x10)
 		*status |= FE_HAS_SYNC;

 	if (sync & 0x20) /* frontend can not lock */
 		*status |= FE_TIMEDOUT;

 	if ((sync & 0x1f) == 0x1f)
 		*status |= FE_HAS_LOCK;

 	return 0;
 }

 static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
 {
 	struct tda8083_state* state = fe->demodulator_priv;
 	int ret;
 	u8 buf[3];

 	if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
 		return ret;

 	*ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];

 	return 0;
 }

 static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	u8 signal = ~tda8083_readreg (state, 0x01);
 	*strength = (signal << 8) | signal;

 	return 0;
 }

 static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	u8 _snr = tda8083_readreg (state, 0x08);
 	*snr = (_snr << 8) | _snr;

 	return 0;
 }

 static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	*ucblocks = tda8083_readreg(state, 0x0f);
 	if (*ucblocks == 0xff)
 		*ucblocks = 0xffffffff;

 	return 0;
 }

 static int tda8083_set_frontend(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 	struct tda8083_state* state = fe->demodulator_priv;

 	if (fe->ops.tuner_ops.set_params) {
 		fe->ops.tuner_ops.set_params(fe);
 		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 	}

 	tda8083_set_inversion (state, p->inversion);
 	tda8083_set_fec(state, p->fec_inner);
 	tda8083_set_symbolrate(state, p->symbol_rate);

 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 0;
 }

 static int tda8083_get_frontend(struct dvb_frontend *fe,
 				struct dtv_frontend_properties *p)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	/*  FIXME: get symbolrate & frequency offset...*/
 	/*p->frequency = ???;*/
 	p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
 			INVERSION_ON : INVERSION_OFF;
 	p->fec_inner = tda8083_get_fec(state);
 	/*p->symbol_rate = tda8083_get_symbolrate (state);*/

 	return 0;
 }

 static int tda8083_sleep(struct dvb_frontend* fe)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	tda8083_writereg (state, 0x00, 0x02);
 	return 0;
 }

 static int tda8083_init(struct dvb_frontend* fe)
 {
 	struct tda8083_state* state = fe->demodulator_priv;
 	int i;

 	for (i=0; i<44; i++)
 		tda8083_writereg (state, i, tda8083_init_tab[i]);

 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 0;
 }

 static int tda8083_diseqc_send_burst(struct dvb_frontend *fe,
 				     enum fe_sec_mini_cmd burst)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	tda8083_send_diseqc_burst (state, burst);
 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 0;
 }

 static int tda8083_diseqc_set_tone(struct dvb_frontend *fe,
 				   enum fe_sec_tone_mode tone)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	tda8083_set_tone (state, tone);
 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 0;
 }

 static int tda8083_diseqc_set_voltage(struct dvb_frontend *fe,
 				      enum fe_sec_voltage voltage)
 {
 	struct tda8083_state* state = fe->demodulator_priv;

 	tda8083_set_voltage (state, voltage);
 	tda8083_writereg (state, 0x00, 0x3c);
 	tda8083_writereg (state, 0x00, 0x04);

 	return 0;
 }

 static void tda8083_release(struct dvb_frontend* fe)
 {
 	struct tda8083_state* state = fe->demodulator_priv;
 	kfree(state);
 }

 static const struct dvb_frontend_ops tda8083_ops;

 struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
 				    struct i2c_adapter* i2c)
 {
 	struct tda8083_state* state = NULL;

 	/* allocate memory for the internal state */
 	state = kzalloc(sizeof(struct tda8083_state), GFP_KERNEL);
 	if (state == NULL) goto error;

 	/* setup the state */
 	state->config = config;
 	state->i2c = i2c;

 	/* check if the demod is there */
 	if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;

 	/* create dvb_frontend */
 	memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
 	state->frontend.demodulator_priv = state;
 	return &state->frontend;

 error:
 	kfree(state);
 	return NULL;
 }

 static const struct dvb_frontend_ops tda8083_ops = {
 	.delsys = { SYS_DVBS },
 	.info = {
 		.name			= "Philips TDA8083 DVB-S",
 		.frequency_min_hz	=  920 * MHz,     /* TDA8060 */
 		.frequency_max_hz	= 2200 * MHz,    /* TDA8060 */
 		.frequency_stepsize_hz	=  125 * kHz,
 		.symbol_rate_min	= 12000000,
 		.symbol_rate_max	= 30000000,
 	/*      .symbol_rate_tolerance	= ???,*/
 		.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_8_9 | FE_CAN_FEC_AUTO |
 			FE_CAN_QPSK | FE_CAN_MUTE_TS
 	},

 	.release = tda8083_release,

 	.init = tda8083_init,
 	.sleep = tda8083_sleep,

 	.set_frontend = tda8083_set_frontend,
 	.get_frontend = tda8083_get_frontend,

 	.read_status = tda8083_read_status,
 	.read_signal_strength = tda8083_read_signal_strength,
 	.read_snr = tda8083_read_snr,
 	.read_ber = tda8083_read_ber,
 	.read_ucblocks = tda8083_read_ucblocks,

 	.diseqc_send_master_cmd = tda8083_send_diseqc_msg,
 	.diseqc_send_burst = tda8083_diseqc_send_burst,
 	.set_tone = tda8083_diseqc_set_tone,
 	.set_voltage = tda8083_diseqc_set_voltage,
 };

 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

 MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 MODULE_LICENSE("GPL");

 EXPORT_SYMBOL_GPL(tda8083_attach);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	Driver for Philips TDA8083 based QPSK Demodulator

	Copyright (C) 2001 Convergence Integrated Media GmbH

	written by Ralph Metzler <ralph@convergence.de>

	adoption to the new DVB frontend API and diagnostic ioctl's
	by Holger Waechtler <holger@convergence.de>


	*/

	#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 <media/dvb_frontend.h>
	#include "tda8083.h"


	struct tda8083_state {
	struct i2c_adapter* i2c;
	/* configuration settings */
	const struct tda8083_config* config;
	struct dvb_frontend frontend;
	};

	static int debug;
	#define dprintk(args...) \
	do { \
	if (debug) printk(KERN_DEBUG "tda8083: " args); \
	} while (0)


	static u8 tda8083_init_tab [] = {
	0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
	0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
	0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
	0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
	0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
	};


	static int tda8083_writereg (struct tda8083_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 %02x, ret == %i)\n",
	__func__, reg, ret);

	return (ret != 1) ? -1 : 0;
	}

	static int tda8083_readregs (struct tda8083_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 (reg %02x, ret == %i)\n",
	__func__, reg1, ret);

	return ret == 2 ? 0 : -1;
	}

	static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
	{
	u8 val;

	tda8083_readregs (state, reg, &val, 1);

	return val;
	}

	static int tda8083_set_inversion(struct tda8083_state *state,
	enum fe_spectral_inversion inversion)
	{
	/* XXX FIXME: implement other modes than FEC_AUTO */
	if (inversion == INVERSION_AUTO)
	return 0;

	return -EINVAL;
	}

	static int tda8083_set_fec(struct tda8083_state *state, enum fe_code_rate fec)
	{
	if (fec == FEC_AUTO)
	return tda8083_writereg (state, 0x07, 0xff);

	if (fec >= FEC_1_2 && fec <= FEC_8_9)
	return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));

	return -EINVAL;
	}

	static enum fe_code_rate tda8083_get_fec(struct tda8083_state *state)
	{
	u8 index;
	static enum fe_code_rate fec_tab[] = {
	FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
	FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8
	};

	index = tda8083_readreg(state, 0x0e) & 0x07;

	return fec_tab [index];
	}

	static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
	{
	u32 ratio;
	u32 tmp;
	u8 filter;

	if (srate > 32000000)
	srate = 32000000;
	if (srate < 500000)
	srate = 500000;

	filter = 0;
	if (srate < 24000000)
	filter = 2;
	if (srate < 16000000)
	filter = 3;

	tmp = 31250 << 16;
	ratio = tmp / srate;

	tmp = (tmp % srate) << 8;
	ratio = (ratio << 8) + tmp / srate;

	tmp = (tmp % srate) << 8;
	ratio = (ratio << 8) + tmp / srate;

	dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);

	tda8083_writereg (state, 0x05, filter);
	tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
	tda8083_writereg (state, 0x03, (ratio >> 8) & 0xff);
	tda8083_writereg (state, 0x04, (ratio ) & 0xff);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 1;
	}

	static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
	{
	unsigned long start = jiffies;

	while (jiffies - start < timeout &&
	!(tda8083_readreg(state, 0x02) & 0x80))
	{
	msleep(50);
	}
	}

	static int tda8083_set_tone(struct tda8083_state *state,
	enum fe_sec_tone_mode tone)
	{
	tda8083_writereg (state, 0x26, 0xf1);

	switch (tone) {
	case SEC_TONE_OFF:
	return tda8083_writereg (state, 0x29, 0x00);
	case SEC_TONE_ON:
	return tda8083_writereg (state, 0x29, 0x80);
	default:
	return -EINVAL;
	}
	}

	static int tda8083_set_voltage(struct tda8083_state *state,
	enum fe_sec_voltage voltage)
	{
	switch (voltage) {
	case SEC_VOLTAGE_13:
	return tda8083_writereg (state, 0x20, 0x00);
	case SEC_VOLTAGE_18:
	return tda8083_writereg (state, 0x20, 0x11);
	default:
	return -EINVAL;
	}
	}

	static int tda8083_send_diseqc_burst(struct tda8083_state *state,
	enum fe_sec_mini_cmd burst)
	{
	switch (burst) {
	case SEC_MINI_A:
	tda8083_writereg (state, 0x29, (5 << 2)); /* send burst A */
	break;
	case SEC_MINI_B:
	tda8083_writereg (state, 0x29, (7 << 2)); /* send B */
	break;
	default:
	return -EINVAL;
	}

	tda8083_wait_diseqc_fifo (state, 100);

	return 0;
	}

	static int tda8083_send_diseqc_msg(struct dvb_frontend *fe,
	struct dvb_diseqc_master_cmd *m)
	{
	struct tda8083_state* state = fe->demodulator_priv;
	int i;

	tda8083_writereg (state, 0x29, (m->msg_len - 3) \| (1 << 2)); /* enable */

	for (i=0; i<m->msg_len; i++)
	tda8083_writereg (state, 0x23 + i, m->msg[i]);

	tda8083_writereg (state, 0x29, (m->msg_len - 3) \| (3 << 2)); /* send!! */

	tda8083_wait_diseqc_fifo (state, 100);

	return 0;
	}

	static int tda8083_read_status(struct dvb_frontend *fe,
	enum fe_status *status)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 signal = ~tda8083_readreg (state, 0x01);
	u8 sync = tda8083_readreg (state, 0x02);

	*status = 0;

	if (signal > 10)
	*status \|= FE_HAS_SIGNAL;

	if (sync & 0x01)
	*status \|= FE_HAS_CARRIER;

	if (sync & 0x02)
	*status \|= FE_HAS_VITERBI;

	if (sync & 0x10)
	*status \|= FE_HAS_SYNC;

	if (sync & 0x20) /* frontend can not lock */
	*status \|= FE_TIMEDOUT;

	if ((sync & 0x1f) == 0x1f)
	*status \|= FE_HAS_LOCK;

	return 0;
	}

	static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
	{
	struct tda8083_state* state = fe->demodulator_priv;
	int ret;
	u8 buf[3];

	if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
	return ret;

	*ber = ((buf[0] & 0x1f) << 16) \| (buf[1] << 8) \| buf[2];

	return 0;
	}

	static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 signal = ~tda8083_readreg (state, 0x01);
	*strength = (signal << 8) \| signal;

	return 0;
	}

	static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 _snr = tda8083_readreg (state, 0x08);
	*snr = (_snr << 8) \| _snr;

	return 0;
	}

	static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	*ucblocks = tda8083_readreg(state, 0x0f);
	if (*ucblocks == 0xff)
	*ucblocks = 0xffffffff;

	return 0;
	}

	static int tda8083_set_frontend(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct tda8083_state* state = fe->demodulator_priv;

	if (fe->ops.tuner_ops.set_params) {
	fe->ops.tuner_ops.set_params(fe);
	if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
	}

	tda8083_set_inversion (state, p->inversion);
	tda8083_set_fec(state, p->fec_inner);
	tda8083_set_symbolrate(state, p->symbol_rate);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
	}

	static int tda8083_get_frontend(struct dvb_frontend *fe,
	struct dtv_frontend_properties *p)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	/* FIXME: get symbolrate & frequency offset...*/
	/p->frequency = ???;/
	p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
	INVERSION_ON : INVERSION_OFF;
	p->fec_inner = tda8083_get_fec(state);
	/p->symbol_rate = tda8083_get_symbolrate (state);/

	return 0;
	}

	static int tda8083_sleep(struct dvb_frontend* fe)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_writereg (state, 0x00, 0x02);
	return 0;
	}

	static int tda8083_init(struct dvb_frontend* fe)
	{
	struct tda8083_state* state = fe->demodulator_priv;
	int i;

	for (i=0; i<44; i++)
	tda8083_writereg (state, i, tda8083_init_tab[i]);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
	}

	static int tda8083_diseqc_send_burst(struct dvb_frontend *fe,
	enum fe_sec_mini_cmd burst)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_send_diseqc_burst (state, burst);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
	}

	static int tda8083_diseqc_set_tone(struct dvb_frontend *fe,
	enum fe_sec_tone_mode tone)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_set_tone (state, tone);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
	}

	static int tda8083_diseqc_set_voltage(struct dvb_frontend *fe,
	enum fe_sec_voltage voltage)
	{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_set_voltage (state, voltage);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
	}

	static void tda8083_release(struct dvb_frontend* fe)
	{
	struct tda8083_state* state = fe->demodulator_priv;
	kfree(state);
	}

	static const struct dvb_frontend_ops tda8083_ops;

	struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
	struct i2c_adapter* i2c)
	{
	struct tda8083_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct tda8083_state), GFP_KERNEL);
	if (state == NULL) goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	/* check if the demod is there */
	if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

	error:
	kfree(state);
	return NULL;
	}

	static const struct dvb_frontend_ops tda8083_ops = {
	.delsys = { SYS_DVBS },
	.info = {
	.name = "Philips TDA8083 DVB-S",
	.frequency_min_hz = 920 * MHz, /* TDA8060 */
	.frequency_max_hz = 2200 * MHz, /* TDA8060 */
	.frequency_stepsize_hz = 125 * kHz,
	.symbol_rate_min = 12000000,
	.symbol_rate_max = 30000000,
	/* .symbol_rate_tolerance = ???,*/
	.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_8_9 \| FE_CAN_FEC_AUTO \|
	FE_CAN_QPSK \| FE_CAN_MUTE_TS
	},

	.release = tda8083_release,

	.init = tda8083_init,
	.sleep = tda8083_sleep,

	.set_frontend = tda8083_set_frontend,
	.get_frontend = tda8083_get_frontend,

	.read_status = tda8083_read_status,
	.read_signal_strength = tda8083_read_signal_strength,
	.read_snr = tda8083_read_snr,
	.read_ber = tda8083_read_ber,
	.read_ucblocks = tda8083_read_ucblocks,

	.diseqc_send_master_cmd = tda8083_send_diseqc_msg,
	.diseqc_send_burst = tda8083_diseqc_send_burst,
	.set_tone = tda8083_diseqc_set_tone,
	.set_voltage = tda8083_diseqc_set_voltage,
	};

	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

	MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
	MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
	MODULE_LICENSE("GPL");

	EXPORT_SYMBOL_GPL(tda8083_attach);