drivers/media/dvb-frontends/tda10086.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
   /*
      Driver for Philips tda10086 DVBS Demodulator

      (c) 2006 Andrew de Quincey


    */

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

 #include <media/dvb_frontend.h>
 #include "tda10086.h"

 #define SACLK 96000000

 struct tda10086_state {
 	struct i2c_adapter* i2c;
 	const struct tda10086_config* config;
 	struct dvb_frontend frontend;

 	/* private demod data */
 	u32 frequency;
 	u32 symbol_rate;
 	bool has_lock;
 };

 static int debug;
 #define dprintk(args...) \
 	do { \
 		if (debug) printk(KERN_DEBUG "tda10086: " args); \
 	} while (0)

 static int tda10086_write_byte(struct tda10086_state *state, int reg, int data)
 {
 	int ret;
 	u8 b0[] = { reg, data };
 	struct i2c_msg msg = { .flags = 0, .buf = b0, .len = 2 };

 	msg.addr = state->config->demod_address;
 	ret = i2c_transfer(state->i2c, &msg, 1);

 	if (ret != 1)
 		dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
 			__func__, reg, data, ret);

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

 static int tda10086_read_byte(struct tda10086_state *state, int reg)
 {
 	int ret;
 	u8 b0[] = { reg };
 	u8 b1[] = { 0 };
 	struct i2c_msg msg[] = {{ .flags = 0, .buf = b0, .len = 1 },
 				{ .flags = I2C_M_RD, .buf = b1, .len = 1 }};

 	msg[0].addr = state->config->demod_address;
 	msg[1].addr = state->config->demod_address;
 	ret = i2c_transfer(state->i2c, msg, 2);

 	if (ret != 2) {
 		dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg,
 			ret);
 		return ret;
 	}

 	return b1[0];
 }

 static int tda10086_write_mask(struct tda10086_state *state, int reg, int mask, int data)
 {
 	int val;

 	/* read a byte and check */
 	val = tda10086_read_byte(state, reg);
 	if (val < 0)
 		return val;

 	/* mask if off */
 	val = val & ~mask;
 	val |= data & 0xff;

 	/* write it out again */
 	return tda10086_write_byte(state, reg, val);
 }

 static int tda10086_init(struct dvb_frontend* fe)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 t22k_off = 0x80;

 	dprintk ("%s\n", __func__);

 	if (state->config->diseqc_tone)
 		t22k_off = 0;
 	/* reset */
 	tda10086_write_byte(state, 0x00, 0x00);
 	msleep(10);

 	/* misc setup */
 	tda10086_write_byte(state, 0x01, 0x94);
 	tda10086_write_byte(state, 0x02, 0x35); /* NOTE: TT drivers appear to disable CSWP */
 	tda10086_write_byte(state, 0x03, 0xe4);
 	tda10086_write_byte(state, 0x04, 0x43);
 	tda10086_write_byte(state, 0x0c, 0x0c);
 	tda10086_write_byte(state, 0x1b, 0xb0); /* noise threshold */
 	tda10086_write_byte(state, 0x20, 0x89); /* misc */
 	tda10086_write_byte(state, 0x30, 0x04); /* acquisition period length */
 	tda10086_write_byte(state, 0x32, 0x00); /* irq off */
 	tda10086_write_byte(state, 0x31, 0x56); /* setup AFC */

 	/* setup PLL (this assumes SACLK = 96MHz) */
 	tda10086_write_byte(state, 0x55, 0x2c); /* misc PLL setup */
 	if (state->config->xtal_freq == TDA10086_XTAL_16M) {
 		tda10086_write_byte(state, 0x3a, 0x0b); /* M=12 */
 		tda10086_write_byte(state, 0x3b, 0x01); /* P=2 */
 	} else {
 		tda10086_write_byte(state, 0x3a, 0x17); /* M=24 */
 		tda10086_write_byte(state, 0x3b, 0x00); /* P=1 */
 	}
 	tda10086_write_mask(state, 0x55, 0x20, 0x00); /* powerup PLL */

 	/* setup TS interface */
 	tda10086_write_byte(state, 0x11, 0x81);
 	tda10086_write_byte(state, 0x12, 0x81);
 	tda10086_write_byte(state, 0x19, 0x40); /* parallel mode A + MSBFIRST */
 	tda10086_write_byte(state, 0x56, 0x80); /* powerdown WPLL - unused in the mode we use */
 	tda10086_write_byte(state, 0x57, 0x08); /* bypass WPLL - unused in the mode we use */
 	tda10086_write_byte(state, 0x10, 0x2a);

 	/* setup ADC */
 	tda10086_write_byte(state, 0x58, 0x61); /* ADC setup */
 	tda10086_write_mask(state, 0x58, 0x01, 0x00); /* powerup ADC */

 	/* setup AGC */
 	tda10086_write_byte(state, 0x05, 0x0B);
 	tda10086_write_byte(state, 0x37, 0x63);
 	tda10086_write_byte(state, 0x3f, 0x0a); /* NOTE: flydvb varies it */
 	tda10086_write_byte(state, 0x40, 0x64);
 	tda10086_write_byte(state, 0x41, 0x4f);
 	tda10086_write_byte(state, 0x42, 0x43);

 	/* setup viterbi */
 	tda10086_write_byte(state, 0x1a, 0x11); /* VBER 10^6, DVB, QPSK */

 	/* setup carrier recovery */
 	tda10086_write_byte(state, 0x3d, 0x80);

 	/* setup SEC */
 	tda10086_write_byte(state, 0x36, t22k_off); /* all SEC off, 22k tone */
 	tda10086_write_byte(state, 0x34, (((1<<19) * (22000/1000)) / (SACLK/1000)));
 	tda10086_write_byte(state, 0x35, (((1<<19) * (22000/1000)) / (SACLK/1000)) >> 8);

 	return 0;
 }

 static void tda10086_diseqc_wait(struct tda10086_state *state)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(200);
 	while (!(tda10086_read_byte(state, 0x50) & 0x01)) {
 		if(time_after(jiffies, timeout)) {
 			printk("%s: diseqc queue not ready, command may be lost.\n", __func__);
 			break;
 		}
 		msleep(10);
 	}
 }

 static int tda10086_set_tone(struct dvb_frontend *fe,
 			     enum fe_sec_tone_mode tone)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 t22k_off = 0x80;

 	dprintk ("%s\n", __func__);

 	if (state->config->diseqc_tone)
 		t22k_off = 0;

 	switch (tone) {
 	case SEC_TONE_OFF:
 		tda10086_write_byte(state, 0x36, t22k_off);
 		break;

 	case SEC_TONE_ON:
 		tda10086_write_byte(state, 0x36, 0x01 + t22k_off);
 		break;
 	}

 	return 0;
 }

 static int tda10086_send_master_cmd (struct dvb_frontend* fe,
 				    struct dvb_diseqc_master_cmd* cmd)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	int i;
 	u8 oldval;
 	u8 t22k_off = 0x80;

 	dprintk ("%s\n", __func__);

 	if (state->config->diseqc_tone)
 		t22k_off = 0;

 	if (cmd->msg_len > 6)
 		return -EINVAL;
 	oldval = tda10086_read_byte(state, 0x36);

 	for(i=0; i< cmd->msg_len; i++) {
 		tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
 	}
 	tda10086_write_byte(state, 0x36, (0x08 + t22k_off)
 					| ((cmd->msg_len - 1) << 4));

 	tda10086_diseqc_wait(state);

 	tda10086_write_byte(state, 0x36, oldval);

 	return 0;
 }

 static int tda10086_send_burst(struct dvb_frontend *fe,
 			       enum fe_sec_mini_cmd minicmd)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 oldval = tda10086_read_byte(state, 0x36);
 	u8 t22k_off = 0x80;

 	dprintk ("%s\n", __func__);

 	if (state->config->diseqc_tone)
 		t22k_off = 0;

 	switch(minicmd) {
 	case SEC_MINI_A:
 		tda10086_write_byte(state, 0x36, 0x04 + t22k_off);
 		break;

 	case SEC_MINI_B:
 		tda10086_write_byte(state, 0x36, 0x06 + t22k_off);
 		break;
 	}

 	tda10086_diseqc_wait(state);

 	tda10086_write_byte(state, 0x36, oldval);

 	return 0;
 }

 static int tda10086_set_inversion(struct tda10086_state *state,
 				  struct dtv_frontend_properties *fe_params)
 {
 	u8 invval = 0x80;

 	dprintk ("%s %i %i\n", __func__, fe_params->inversion, state->config->invert);

 	switch(fe_params->inversion) {
 	case INVERSION_OFF:
 		if (state->config->invert)
 			invval = 0x40;
 		break;
 	case INVERSION_ON:
 		if (!state->config->invert)
 			invval = 0x40;
 		break;
 	case INVERSION_AUTO:
 		invval = 0x00;
 		break;
 	}
 	tda10086_write_mask(state, 0x0c, 0xc0, invval);

 	return 0;
 }

 static int tda10086_set_symbol_rate(struct tda10086_state *state,
 				    struct dtv_frontend_properties *fe_params)
 {
 	u8 dfn = 0;
 	u8 afs = 0;
 	u8 byp = 0;
 	u8 reg37 = 0x43;
 	u8 reg42 = 0x43;
 	u64 big;
 	u32 tmp;
 	u32 bdr;
 	u32 bdri;
 	u32 symbol_rate = fe_params->symbol_rate;

 	dprintk ("%s %i\n", __func__, symbol_rate);

 	/* setup the decimation and anti-aliasing filters.. */
 	if (symbol_rate < (u32) (SACLK * 0.0137)) {
 		dfn=4;
 		afs=1;
 	} else if (symbol_rate < (u32) (SACLK * 0.0208)) {
 		dfn=4;
 		afs=0;
 	} else if (symbol_rate < (u32) (SACLK * 0.0270)) {
 		dfn=3;
 		afs=1;
 	} else if (symbol_rate < (u32) (SACLK * 0.0416)) {
 		dfn=3;
 		afs=0;
 	} else if (symbol_rate < (u32) (SACLK * 0.0550)) {
 		dfn=2;
 		afs=1;
 	} else if (symbol_rate < (u32) (SACLK * 0.0833)) {
 		dfn=2;
 		afs=0;
 	} else if (symbol_rate < (u32) (SACLK * 0.1100)) {
 		dfn=1;
 		afs=1;
 	} else if (symbol_rate < (u32) (SACLK * 0.1666)) {
 		dfn=1;
 		afs=0;
 	} else if (symbol_rate < (u32) (SACLK * 0.2200)) {
 		dfn=0;
 		afs=1;
 	} else if (symbol_rate < (u32) (SACLK * 0.3333)) {
 		dfn=0;
 		afs=0;
 	} else {
 		reg37 = 0x63;
 		reg42 = 0x4f;
 		byp=1;
 	}

 	/* calculate BDR */
 	big = (1ULL<<21) * ((u64) symbol_rate/1000ULL) * (1ULL<<dfn);
 	big += ((SACLK/1000ULL)-1ULL);
 	do_div(big, (SACLK/1000ULL));
 	bdr = big & 0xfffff;

 	/* calculate BDRI */
 	tmp = (1<<dfn)*(symbol_rate/1000);
 	bdri = ((32 * (SACLK/1000)) + (tmp-1)) / tmp;

 	tda10086_write_byte(state, 0x21, (afs << 7) | dfn);
 	tda10086_write_mask(state, 0x20, 0x08, byp << 3);
 	tda10086_write_byte(state, 0x06, bdr);
 	tda10086_write_byte(state, 0x07, bdr >> 8);
 	tda10086_write_byte(state, 0x08, bdr >> 16);
 	tda10086_write_byte(state, 0x09, bdri);
 	tda10086_write_byte(state, 0x37, reg37);
 	tda10086_write_byte(state, 0x42, reg42);

 	return 0;
 }

 static int tda10086_set_fec(struct tda10086_state *state,
 			    struct dtv_frontend_properties *fe_params)
 {
 	u8 fecval;

 	dprintk("%s %i\n", __func__, fe_params->fec_inner);

 	switch (fe_params->fec_inner) {
 	case FEC_1_2:
 		fecval = 0x00;
 		break;
 	case FEC_2_3:
 		fecval = 0x01;
 		break;
 	case FEC_3_4:
 		fecval = 0x02;
 		break;
 	case FEC_4_5:
 		fecval = 0x03;
 		break;
 	case FEC_5_6:
 		fecval = 0x04;
 		break;
 	case FEC_6_7:
 		fecval = 0x05;
 		break;
 	case FEC_7_8:
 		fecval = 0x06;
 		break;
 	case FEC_8_9:
 		fecval = 0x07;
 		break;
 	case FEC_AUTO:
 		fecval = 0x08;
 		break;
 	default:
 		return -1;
 	}
 	tda10086_write_byte(state, 0x0d, fecval);

 	return 0;
 }

 static int tda10086_set_frontend(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache;
 	struct tda10086_state *state = fe->demodulator_priv;
 	int ret;
 	u32 freq = 0;
 	int freqoff;

 	dprintk ("%s\n", __func__);

 	/* modify parameters for tuning */
 	tda10086_write_byte(state, 0x02, 0x35);
 	state->has_lock = false;

 	/* set params */
 	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);

 		if (fe->ops.tuner_ops.get_frequency)
 			fe->ops.tuner_ops.get_frequency(fe, &freq);
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 0);
 	}

 	/* calculate the frequency offset (in *Hz* not kHz) */
 	freqoff = fe_params->frequency - freq;
 	freqoff = ((1<<16) * freqoff) / (SACLK/1000);
 	tda10086_write_byte(state, 0x3d, 0x80 | ((freqoff >> 8) & 0x7f));
 	tda10086_write_byte(state, 0x3e, freqoff);

 	if ((ret = tda10086_set_inversion(state, fe_params)) < 0)
 		return ret;
 	if ((ret = tda10086_set_symbol_rate(state, fe_params)) < 0)
 		return ret;
 	if ((ret = tda10086_set_fec(state, fe_params)) < 0)
 		return ret;

 	/* soft reset + disable TS output until lock */
 	tda10086_write_mask(state, 0x10, 0x40, 0x40);
 	tda10086_write_mask(state, 0x00, 0x01, 0x00);

 	state->symbol_rate = fe_params->symbol_rate;
 	state->frequency = fe_params->frequency;
 	return 0;
 }

 static int tda10086_get_frontend(struct dvb_frontend *fe,
 				 struct dtv_frontend_properties *fe_params)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 val;
 	int tmp;
 	u64 tmp64;

 	dprintk ("%s\n", __func__);

 	/* check for invalid symbol rate */
 	if (fe_params->symbol_rate < 500000)
 		return -EINVAL;

 	/* calculate the updated frequency (note: we convert from Hz->kHz) */
 	tmp64 = ((u64)tda10086_read_byte(state, 0x52)
 		| (tda10086_read_byte(state, 0x51) << 8));
 	if (tmp64 & 0x8000)
 		tmp64 |= 0xffffffffffff0000ULL;
 	tmp64 = (tmp64 * (SACLK/1000ULL));
 	do_div(tmp64, (1ULL<<15) * (1ULL<<1));
 	fe_params->frequency = (int) state->frequency + (int) tmp64;

 	/* the inversion */
 	val = tda10086_read_byte(state, 0x0c);
 	if (val & 0x80) {
 		switch(val & 0x40) {
 		case 0x00:
 			fe_params->inversion = INVERSION_OFF;
 			if (state->config->invert)
 				fe_params->inversion = INVERSION_ON;
 			break;
 		default:
 			fe_params->inversion = INVERSION_ON;
 			if (state->config->invert)
 				fe_params->inversion = INVERSION_OFF;
 			break;
 		}
 	} else {
 		tda10086_read_byte(state, 0x0f);
 		switch(val & 0x02) {
 		case 0x00:
 			fe_params->inversion = INVERSION_OFF;
 			if (state->config->invert)
 				fe_params->inversion = INVERSION_ON;
 			break;
 		default:
 			fe_params->inversion = INVERSION_ON;
 			if (state->config->invert)
 				fe_params->inversion = INVERSION_OFF;
 			break;
 		}
 	}

 	/* calculate the updated symbol rate */
 	tmp = tda10086_read_byte(state, 0x1d);
 	if (tmp & 0x80)
 		tmp |= 0xffffff00;
 	tmp = (tmp * 480 * (1<<1)) / 128;
 	tmp = ((state->symbol_rate/1000) * tmp) / (1000000/1000);
 	fe_params->symbol_rate = state->symbol_rate + tmp;

 	/* the FEC */
 	val = (tda10086_read_byte(state, 0x0d) & 0x70) >> 4;
 	switch(val) {
 	case 0x00:
 		fe_params->fec_inner = FEC_1_2;
 		break;
 	case 0x01:
 		fe_params->fec_inner = FEC_2_3;
 		break;
 	case 0x02:
 		fe_params->fec_inner = FEC_3_4;
 		break;
 	case 0x03:
 		fe_params->fec_inner = FEC_4_5;
 		break;
 	case 0x04:
 		fe_params->fec_inner = FEC_5_6;
 		break;
 	case 0x05:
 		fe_params->fec_inner = FEC_6_7;
 		break;
 	case 0x06:
 		fe_params->fec_inner = FEC_7_8;
 		break;
 	case 0x07:
 		fe_params->fec_inner = FEC_8_9;
 		break;
 	}

 	return 0;
 }

 static int tda10086_read_status(struct dvb_frontend *fe,
 				enum fe_status *fe_status)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 val;

 	dprintk ("%s\n", __func__);

 	val = tda10086_read_byte(state, 0x0e);
 	*fe_status = 0;
 	if (val & 0x01)
 		*fe_status |= FE_HAS_SIGNAL;
 	if (val & 0x02)
 		*fe_status |= FE_HAS_CARRIER;
 	if (val & 0x04)
 		*fe_status |= FE_HAS_VITERBI;
 	if (val & 0x08)
 		*fe_status |= FE_HAS_SYNC;
 	if (val & 0x10) {
 		*fe_status |= FE_HAS_LOCK;
 		if (!state->has_lock) {
 			state->has_lock = true;
 			/* modify parameters for stable reception */
 			tda10086_write_byte(state, 0x02, 0x00);
 		}
 	}

 	return 0;
 }

 static int tda10086_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 _str;

 	dprintk ("%s\n", __func__);

 	_str = 0xff - tda10086_read_byte(state, 0x43);
 	*signal = (_str << 8) | _str;

 	return 0;
 }

 static int tda10086_read_snr(struct dvb_frontend* fe, u16 * snr)
 {
 	struct tda10086_state* state = fe->demodulator_priv;
 	u8 _snr;

 	dprintk ("%s\n", __func__);

 	_snr = 0xff - tda10086_read_byte(state, 0x1c);
 	*snr = (_snr << 8) | _snr;

 	return 0;
 }

 static int tda10086_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 {
 	struct tda10086_state* state = fe->demodulator_priv;

 	dprintk ("%s\n", __func__);

 	/* read it */
 	*ucblocks = tda10086_read_byte(state, 0x18) & 0x7f;

 	/* reset counter */
 	tda10086_write_byte(state, 0x18, 0x00);
 	tda10086_write_byte(state, 0x18, 0x80);

 	return 0;
 }

 static int tda10086_read_ber(struct dvb_frontend* fe, u32* ber)
 {
 	struct tda10086_state* state = fe->demodulator_priv;

 	dprintk ("%s\n", __func__);

 	/* read it */
 	*ber = 0;
 	*ber |= tda10086_read_byte(state, 0x15);
 	*ber |= tda10086_read_byte(state, 0x16) << 8;
 	*ber |= (tda10086_read_byte(state, 0x17) & 0xf) << 16;

 	return 0;
 }

 static int tda10086_sleep(struct dvb_frontend* fe)
 {
 	struct tda10086_state* state = fe->demodulator_priv;

 	dprintk ("%s\n", __func__);

 	tda10086_write_mask(state, 0x00, 0x08, 0x08);

 	return 0;
 }

 static int tda10086_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 {
 	struct tda10086_state* state = fe->demodulator_priv;

 	dprintk ("%s\n", __func__);

 	if (enable) {
 		tda10086_write_mask(state, 0x00, 0x10, 0x10);
 	} else {
 		tda10086_write_mask(state, 0x00, 0x10, 0x00);
 	}

 	return 0;
 }

 static int tda10086_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 {
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;

 	if (p->symbol_rate > 20000000) {
 		fesettings->min_delay_ms = 50;
 		fesettings->step_size = 2000;
 		fesettings->max_drift = 8000;
 	} else if (p->symbol_rate > 12000000) {
 		fesettings->min_delay_ms = 100;
 		fesettings->step_size = 1500;
 		fesettings->max_drift = 9000;
 	} else if (p->symbol_rate > 8000000) {
 		fesettings->min_delay_ms = 100;
 		fesettings->step_size = 1000;
 		fesettings->max_drift = 8000;
 	} else if (p->symbol_rate > 4000000) {
 		fesettings->min_delay_ms = 100;
 		fesettings->step_size = 500;
 		fesettings->max_drift = 7000;
 	} else if (p->symbol_rate > 2000000) {
 		fesettings->min_delay_ms = 200;
 		fesettings->step_size = p->symbol_rate / 8000;
 		fesettings->max_drift = 14 * fesettings->step_size;
 	} else {
 		fesettings->min_delay_ms = 200;
 		fesettings->step_size =  p->symbol_rate / 8000;
 		fesettings->max_drift = 18 * fesettings->step_size;
 	}

 	return 0;
 }

 static void tda10086_release(struct dvb_frontend* fe)
 {
 	struct tda10086_state *state = fe->demodulator_priv;
 	tda10086_sleep(fe);
 	kfree(state);
 }

 static const struct dvb_frontend_ops tda10086_ops = {
 	.delsys = { SYS_DVBS },
 	.info = {
 		.name     = "Philips TDA10086 DVB-S",
 		.frequency_min_hz      =  950 * MHz,
 		.frequency_max_hz      = 2150 * MHz,
 		.frequency_stepsize_hz =  125 * kHz,
 		.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_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 			FE_CAN_QPSK
 	},

 	.release = tda10086_release,

 	.init = tda10086_init,
 	.sleep = tda10086_sleep,
 	.i2c_gate_ctrl = tda10086_i2c_gate_ctrl,

 	.set_frontend = tda10086_set_frontend,
 	.get_frontend = tda10086_get_frontend,
 	.get_tune_settings = tda10086_get_tune_settings,

 	.read_status = tda10086_read_status,
 	.read_ber = tda10086_read_ber,
 	.read_signal_strength = tda10086_read_signal_strength,
 	.read_snr = tda10086_read_snr,
 	.read_ucblocks = tda10086_read_ucblocks,

 	.diseqc_send_master_cmd = tda10086_send_master_cmd,
 	.diseqc_send_burst = tda10086_send_burst,
 	.set_tone = tda10086_set_tone,
 };

 struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
 				     struct i2c_adapter* i2c)
 {
 	struct tda10086_state *state;

 	dprintk ("%s\n", __func__);

 	/* allocate memory for the internal state */
 	state = kzalloc(sizeof(struct tda10086_state), GFP_KERNEL);
 	if (!state)
 		return NULL;

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

 	/* check if the demod is there */
 	if (tda10086_read_byte(state, 0x1e) != 0xe1) {
 		kfree(state);
 		return NULL;
 	}

 	/* create dvb_frontend */
 	memcpy(&state->frontend.ops, &tda10086_ops, sizeof(struct dvb_frontend_ops));
 	state->frontend.demodulator_priv = state;
 	return &state->frontend;
 }

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

 MODULE_DESCRIPTION("Philips TDA10086 DVB-S Demodulator");
 MODULE_AUTHOR("Andrew de Quincey");
 MODULE_LICENSE("GPL");

 EXPORT_SYMBOL_GPL(tda10086_attach);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	Driver for Philips tda10086 DVBS Demodulator

	(c) 2006 Andrew de Quincey


	*/

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

	#include <media/dvb_frontend.h>
	#include "tda10086.h"

	#define SACLK 96000000

	struct tda10086_state {
	struct i2c_adapter* i2c;
	const struct tda10086_config* config;
	struct dvb_frontend frontend;

	/* private demod data */
	u32 frequency;
	u32 symbol_rate;
	bool has_lock;
	};

	static int debug;
	#define dprintk(args...) \
	do { \
	if (debug) printk(KERN_DEBUG "tda10086: " args); \
	} while (0)

	static int tda10086_write_byte(struct tda10086_state *state, int reg, int data)
	{
	int ret;
	u8 b0[] = { reg, data };
	struct i2c_msg msg = { .flags = 0, .buf = b0, .len = 2 };

	msg.addr = state->config->demod_address;
	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1)
	dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
	__func__, reg, data, ret);

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

	static int tda10086_read_byte(struct tda10086_state *state, int reg)
	{
	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {{ .flags = 0, .buf = b0, .len = 1 },
	{ .flags = I2C_M_RD, .buf = b1, .len = 1 }};

	msg[0].addr = state->config->demod_address;
	msg[1].addr = state->config->demod_address;
	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2) {
	dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg,
	ret);
	return ret;
	}

	return b1[0];
	}

	static int tda10086_write_mask(struct tda10086_state *state, int reg, int mask, int data)
	{
	int val;

	/* read a byte and check */
	val = tda10086_read_byte(state, reg);
	if (val < 0)
	return val;

	/* mask if off */
	val = val & ~mask;
	val \|= data & 0xff;

	/* write it out again */
	return tda10086_write_byte(state, reg, val);
	}

	static int tda10086_init(struct dvb_frontend* fe)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 t22k_off = 0x80;

	dprintk ("%s\n", __func__);

	if (state->config->diseqc_tone)
	t22k_off = 0;
	/* reset */
	tda10086_write_byte(state, 0x00, 0x00);
	msleep(10);

	/* misc setup */
	tda10086_write_byte(state, 0x01, 0x94);
	tda10086_write_byte(state, 0x02, 0x35); /* NOTE: TT drivers appear to disable CSWP */
	tda10086_write_byte(state, 0x03, 0xe4);
	tda10086_write_byte(state, 0x04, 0x43);
	tda10086_write_byte(state, 0x0c, 0x0c);
	tda10086_write_byte(state, 0x1b, 0xb0); /* noise threshold */
	tda10086_write_byte(state, 0x20, 0x89); /* misc */
	tda10086_write_byte(state, 0x30, 0x04); /* acquisition period length */
	tda10086_write_byte(state, 0x32, 0x00); /* irq off */
	tda10086_write_byte(state, 0x31, 0x56); /* setup AFC */

	/* setup PLL (this assumes SACLK = 96MHz) */
	tda10086_write_byte(state, 0x55, 0x2c); /* misc PLL setup */
	if (state->config->xtal_freq == TDA10086_XTAL_16M) {
	tda10086_write_byte(state, 0x3a, 0x0b); /* M=12 */
	tda10086_write_byte(state, 0x3b, 0x01); /* P=2 */
	} else {
	tda10086_write_byte(state, 0x3a, 0x17); /* M=24 */
	tda10086_write_byte(state, 0x3b, 0x00); /* P=1 */
	}
	tda10086_write_mask(state, 0x55, 0x20, 0x00); /* powerup PLL */

	/* setup TS interface */
	tda10086_write_byte(state, 0x11, 0x81);
	tda10086_write_byte(state, 0x12, 0x81);
	tda10086_write_byte(state, 0x19, 0x40); /* parallel mode A + MSBFIRST */
	tda10086_write_byte(state, 0x56, 0x80); /* powerdown WPLL - unused in the mode we use */
	tda10086_write_byte(state, 0x57, 0x08); /* bypass WPLL - unused in the mode we use */
	tda10086_write_byte(state, 0x10, 0x2a);

	/* setup ADC */
	tda10086_write_byte(state, 0x58, 0x61); /* ADC setup */
	tda10086_write_mask(state, 0x58, 0x01, 0x00); /* powerup ADC */

	/* setup AGC */
	tda10086_write_byte(state, 0x05, 0x0B);
	tda10086_write_byte(state, 0x37, 0x63);
	tda10086_write_byte(state, 0x3f, 0x0a); /* NOTE: flydvb varies it */
	tda10086_write_byte(state, 0x40, 0x64);
	tda10086_write_byte(state, 0x41, 0x4f);
	tda10086_write_byte(state, 0x42, 0x43);

	/* setup viterbi */
	tda10086_write_byte(state, 0x1a, 0x11); /* VBER 10^6, DVB, QPSK */

	/* setup carrier recovery */
	tda10086_write_byte(state, 0x3d, 0x80);

	/* setup SEC */
	tda10086_write_byte(state, 0x36, t22k_off); /* all SEC off, 22k tone */
	tda10086_write_byte(state, 0x34, (((1<<19) * (22000/1000)) / (SACLK/1000)));
	tda10086_write_byte(state, 0x35, (((1<<19) * (22000/1000)) / (SACLK/1000)) >> 8);

	return 0;
	}

	static void tda10086_diseqc_wait(struct tda10086_state *state)
	{
	unsigned long timeout = jiffies + msecs_to_jiffies(200);
	while (!(tda10086_read_byte(state, 0x50) & 0x01)) {
	if(time_after(jiffies, timeout)) {
	printk("%s: diseqc queue not ready, command may be lost.\n", __func__);
	break;
	}
	msleep(10);
	}
	}

	static int tda10086_set_tone(struct dvb_frontend *fe,
	enum fe_sec_tone_mode tone)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 t22k_off = 0x80;

	dprintk ("%s\n", __func__);

	if (state->config->diseqc_tone)
	t22k_off = 0;

	switch (tone) {
	case SEC_TONE_OFF:
	tda10086_write_byte(state, 0x36, t22k_off);
	break;

	case SEC_TONE_ON:
	tda10086_write_byte(state, 0x36, 0x01 + t22k_off);
	break;
	}

	return 0;
	}

	static int tda10086_send_master_cmd (struct dvb_frontend* fe,
	struct dvb_diseqc_master_cmd* cmd)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	int i;
	u8 oldval;
	u8 t22k_off = 0x80;

	dprintk ("%s\n", __func__);

	if (state->config->diseqc_tone)
	t22k_off = 0;

	if (cmd->msg_len > 6)
	return -EINVAL;
	oldval = tda10086_read_byte(state, 0x36);

	for(i=0; i< cmd->msg_len; i++) {
	tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
	}
	tda10086_write_byte(state, 0x36, (0x08 + t22k_off)
	\| ((cmd->msg_len - 1) << 4));

	tda10086_diseqc_wait(state);

	tda10086_write_byte(state, 0x36, oldval);

	return 0;
	}

	static int tda10086_send_burst(struct dvb_frontend *fe,
	enum fe_sec_mini_cmd minicmd)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 oldval = tda10086_read_byte(state, 0x36);
	u8 t22k_off = 0x80;

	dprintk ("%s\n", __func__);

	if (state->config->diseqc_tone)
	t22k_off = 0;

	switch(minicmd) {
	case SEC_MINI_A:
	tda10086_write_byte(state, 0x36, 0x04 + t22k_off);
	break;

	case SEC_MINI_B:
	tda10086_write_byte(state, 0x36, 0x06 + t22k_off);
	break;
	}

	tda10086_diseqc_wait(state);

	tda10086_write_byte(state, 0x36, oldval);

	return 0;
	}

	static int tda10086_set_inversion(struct tda10086_state *state,
	struct dtv_frontend_properties *fe_params)
	{
	u8 invval = 0x80;

	dprintk ("%s %i %i\n", __func__, fe_params->inversion, state->config->invert);

	switch(fe_params->inversion) {
	case INVERSION_OFF:
	if (state->config->invert)
	invval = 0x40;
	break;
	case INVERSION_ON:
	if (!state->config->invert)
	invval = 0x40;
	break;
	case INVERSION_AUTO:
	invval = 0x00;
	break;
	}
	tda10086_write_mask(state, 0x0c, 0xc0, invval);

	return 0;
	}

	static int tda10086_set_symbol_rate(struct tda10086_state *state,
	struct dtv_frontend_properties *fe_params)
	{
	u8 dfn = 0;
	u8 afs = 0;
	u8 byp = 0;
	u8 reg37 = 0x43;
	u8 reg42 = 0x43;
	u64 big;
	u32 tmp;
	u32 bdr;
	u32 bdri;
	u32 symbol_rate = fe_params->symbol_rate;

	dprintk ("%s %i\n", __func__, symbol_rate);

	/* setup the decimation and anti-aliasing filters.. */
	if (symbol_rate < (u32) (SACLK * 0.0137)) {
	dfn=4;
	afs=1;
	} else if (symbol_rate < (u32) (SACLK * 0.0208)) {
	dfn=4;
	afs=0;
	} else if (symbol_rate < (u32) (SACLK * 0.0270)) {
	dfn=3;
	afs=1;
	} else if (symbol_rate < (u32) (SACLK * 0.0416)) {
	dfn=3;
	afs=0;
	} else if (symbol_rate < (u32) (SACLK * 0.0550)) {
	dfn=2;
	afs=1;
	} else if (symbol_rate < (u32) (SACLK * 0.0833)) {
	dfn=2;
	afs=0;
	} else if (symbol_rate < (u32) (SACLK * 0.1100)) {
	dfn=1;
	afs=1;
	} else if (symbol_rate < (u32) (SACLK * 0.1666)) {
	dfn=1;
	afs=0;
	} else if (symbol_rate < (u32) (SACLK * 0.2200)) {
	dfn=0;
	afs=1;
	} else if (symbol_rate < (u32) (SACLK * 0.3333)) {
	dfn=0;
	afs=0;
	} else {
	reg37 = 0x63;
	reg42 = 0x4f;
	byp=1;
	}

	/* calculate BDR */
	big = (1ULL<<21) * ((u64) symbol_rate/1000ULL) * (1ULL<<dfn);
	big += ((SACLK/1000ULL)-1ULL);
	do_div(big, (SACLK/1000ULL));
	bdr = big & 0xfffff;

	/* calculate BDRI */
	tmp = (1<<dfn)*(symbol_rate/1000);
	bdri = ((32 * (SACLK/1000)) + (tmp-1)) / tmp;

	tda10086_write_byte(state, 0x21, (afs << 7) \| dfn);
	tda10086_write_mask(state, 0x20, 0x08, byp << 3);
	tda10086_write_byte(state, 0x06, bdr);
	tda10086_write_byte(state, 0x07, bdr >> 8);
	tda10086_write_byte(state, 0x08, bdr >> 16);
	tda10086_write_byte(state, 0x09, bdri);
	tda10086_write_byte(state, 0x37, reg37);
	tda10086_write_byte(state, 0x42, reg42);

	return 0;
	}

	static int tda10086_set_fec(struct tda10086_state *state,
	struct dtv_frontend_properties *fe_params)
	{
	u8 fecval;

	dprintk("%s %i\n", __func__, fe_params->fec_inner);

	switch (fe_params->fec_inner) {
	case FEC_1_2:
	fecval = 0x00;
	break;
	case FEC_2_3:
	fecval = 0x01;
	break;
	case FEC_3_4:
	fecval = 0x02;
	break;
	case FEC_4_5:
	fecval = 0x03;
	break;
	case FEC_5_6:
	fecval = 0x04;
	break;
	case FEC_6_7:
	fecval = 0x05;
	break;
	case FEC_7_8:
	fecval = 0x06;
	break;
	case FEC_8_9:
	fecval = 0x07;
	break;
	case FEC_AUTO:
	fecval = 0x08;
	break;
	default:
	return -1;
	}
	tda10086_write_byte(state, 0x0d, fecval);

	return 0;
	}

	static int tda10086_set_frontend(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache;
	struct tda10086_state *state = fe->demodulator_priv;
	int ret;
	u32 freq = 0;
	int freqoff;

	dprintk ("%s\n", __func__);

	/* modify parameters for tuning */
	tda10086_write_byte(state, 0x02, 0x35);
	state->has_lock = false;

	/* set params */
	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);

	if (fe->ops.tuner_ops.get_frequency)
	fe->ops.tuner_ops.get_frequency(fe, &freq);
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	}

	/* calculate the frequency offset (in Hz not kHz) */
	freqoff = fe_params->frequency - freq;
	freqoff = ((1<<16) * freqoff) / (SACLK/1000);
	tda10086_write_byte(state, 0x3d, 0x80 \| ((freqoff >> 8) & 0x7f));
	tda10086_write_byte(state, 0x3e, freqoff);

	if ((ret = tda10086_set_inversion(state, fe_params)) < 0)
	return ret;
	if ((ret = tda10086_set_symbol_rate(state, fe_params)) < 0)
	return ret;
	if ((ret = tda10086_set_fec(state, fe_params)) < 0)
	return ret;

	/* soft reset + disable TS output until lock */
	tda10086_write_mask(state, 0x10, 0x40, 0x40);
	tda10086_write_mask(state, 0x00, 0x01, 0x00);

	state->symbol_rate = fe_params->symbol_rate;
	state->frequency = fe_params->frequency;
	return 0;
	}

	static int tda10086_get_frontend(struct dvb_frontend *fe,
	struct dtv_frontend_properties *fe_params)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 val;
	int tmp;
	u64 tmp64;

	dprintk ("%s\n", __func__);

	/* check for invalid symbol rate */
	if (fe_params->symbol_rate < 500000)
	return -EINVAL;

	/* calculate the updated frequency (note: we convert from Hz->kHz) */
	tmp64 = ((u64)tda10086_read_byte(state, 0x52)
	\| (tda10086_read_byte(state, 0x51) << 8));
	if (tmp64 & 0x8000)
	tmp64 \|= 0xffffffffffff0000ULL;
	tmp64 = (tmp64 * (SACLK/1000ULL));
	do_div(tmp64, (1ULL<<15) * (1ULL<<1));
	fe_params->frequency = (int) state->frequency + (int) tmp64;

	/* the inversion */
	val = tda10086_read_byte(state, 0x0c);
	if (val & 0x80) {
	switch(val & 0x40) {
	case 0x00:
	fe_params->inversion = INVERSION_OFF;
	if (state->config->invert)
	fe_params->inversion = INVERSION_ON;
	break;
	default:
	fe_params->inversion = INVERSION_ON;
	if (state->config->invert)
	fe_params->inversion = INVERSION_OFF;
	break;
	}
	} else {
	tda10086_read_byte(state, 0x0f);
	switch(val & 0x02) {
	case 0x00:
	fe_params->inversion = INVERSION_OFF;
	if (state->config->invert)
	fe_params->inversion = INVERSION_ON;
	break;
	default:
	fe_params->inversion = INVERSION_ON;
	if (state->config->invert)
	fe_params->inversion = INVERSION_OFF;
	break;
	}
	}

	/* calculate the updated symbol rate */
	tmp = tda10086_read_byte(state, 0x1d);
	if (tmp & 0x80)
	tmp \|= 0xffffff00;
	tmp = (tmp * 480 * (1<<1)) / 128;
	tmp = ((state->symbol_rate/1000) * tmp) / (1000000/1000);
	fe_params->symbol_rate = state->symbol_rate + tmp;

	/* the FEC */
	val = (tda10086_read_byte(state, 0x0d) & 0x70) >> 4;
	switch(val) {
	case 0x00:
	fe_params->fec_inner = FEC_1_2;
	break;
	case 0x01:
	fe_params->fec_inner = FEC_2_3;
	break;
	case 0x02:
	fe_params->fec_inner = FEC_3_4;
	break;
	case 0x03:
	fe_params->fec_inner = FEC_4_5;
	break;
	case 0x04:
	fe_params->fec_inner = FEC_5_6;
	break;
	case 0x05:
	fe_params->fec_inner = FEC_6_7;
	break;
	case 0x06:
	fe_params->fec_inner = FEC_7_8;
	break;
	case 0x07:
	fe_params->fec_inner = FEC_8_9;
	break;
	}

	return 0;
	}

	static int tda10086_read_status(struct dvb_frontend *fe,
	enum fe_status *fe_status)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 val;

	dprintk ("%s\n", __func__);

	val = tda10086_read_byte(state, 0x0e);
	*fe_status = 0;
	if (val & 0x01)
	*fe_status \|= FE_HAS_SIGNAL;
	if (val & 0x02)
	*fe_status \|= FE_HAS_CARRIER;
	if (val & 0x04)
	*fe_status \|= FE_HAS_VITERBI;
	if (val & 0x08)
	*fe_status \|= FE_HAS_SYNC;
	if (val & 0x10) {
	*fe_status \|= FE_HAS_LOCK;
	if (!state->has_lock) {
	state->has_lock = true;
	/* modify parameters for stable reception */
	tda10086_write_byte(state, 0x02, 0x00);
	}
	}

	return 0;
	}

	static int tda10086_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 _str;

	dprintk ("%s\n", __func__);

	_str = 0xff - tda10086_read_byte(state, 0x43);
	*signal = (_str << 8) \| _str;

	return 0;
	}

	static int tda10086_read_snr(struct dvb_frontend* fe, u16 * snr)
	{
	struct tda10086_state* state = fe->demodulator_priv;
	u8 _snr;

	dprintk ("%s\n", __func__);

	_snr = 0xff - tda10086_read_byte(state, 0x1c);
	*snr = (_snr << 8) \| _snr;

	return 0;
	}

	static int tda10086_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
	{
	struct tda10086_state* state = fe->demodulator_priv;

	dprintk ("%s\n", __func__);

	/* read it */
	*ucblocks = tda10086_read_byte(state, 0x18) & 0x7f;

	/* reset counter */
	tda10086_write_byte(state, 0x18, 0x00);
	tda10086_write_byte(state, 0x18, 0x80);

	return 0;
	}

	static int tda10086_read_ber(struct dvb_frontend* fe, u32* ber)
	{
	struct tda10086_state* state = fe->demodulator_priv;

	dprintk ("%s\n", __func__);

	/* read it */
	*ber = 0;
	*ber \|= tda10086_read_byte(state, 0x15);
	*ber \|= tda10086_read_byte(state, 0x16) << 8;
	*ber \|= (tda10086_read_byte(state, 0x17) & 0xf) << 16;

	return 0;
	}

	static int tda10086_sleep(struct dvb_frontend* fe)
	{
	struct tda10086_state* state = fe->demodulator_priv;

	dprintk ("%s\n", __func__);

	tda10086_write_mask(state, 0x00, 0x08, 0x08);

	return 0;
	}

	static int tda10086_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
	{
	struct tda10086_state* state = fe->demodulator_priv;

	dprintk ("%s\n", __func__);

	if (enable) {
	tda10086_write_mask(state, 0x00, 0x10, 0x10);
	} else {
	tda10086_write_mask(state, 0x00, 0x10, 0x00);
	}

	return 0;
	}

	static int tda10086_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
	{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;

	if (p->symbol_rate > 20000000) {
	fesettings->min_delay_ms = 50;
	fesettings->step_size = 2000;
	fesettings->max_drift = 8000;
	} else if (p->symbol_rate > 12000000) {
	fesettings->min_delay_ms = 100;
	fesettings->step_size = 1500;
	fesettings->max_drift = 9000;
	} else if (p->symbol_rate > 8000000) {
	fesettings->min_delay_ms = 100;
	fesettings->step_size = 1000;
	fesettings->max_drift = 8000;
	} else if (p->symbol_rate > 4000000) {
	fesettings->min_delay_ms = 100;
	fesettings->step_size = 500;
	fesettings->max_drift = 7000;
	} else if (p->symbol_rate > 2000000) {
	fesettings->min_delay_ms = 200;
	fesettings->step_size = p->symbol_rate / 8000;
	fesettings->max_drift = 14 * fesettings->step_size;
	} else {
	fesettings->min_delay_ms = 200;
	fesettings->step_size = p->symbol_rate / 8000;
	fesettings->max_drift = 18 * fesettings->step_size;
	}

	return 0;
	}

	static void tda10086_release(struct dvb_frontend* fe)
	{
	struct tda10086_state *state = fe->demodulator_priv;
	tda10086_sleep(fe);
	kfree(state);
	}

	static const struct dvb_frontend_ops tda10086_ops = {
	.delsys = { SYS_DVBS },
	.info = {
	.name = "Philips TDA10086 DVB-S",
	.frequency_min_hz = 950 * MHz,
	.frequency_max_hz = 2150 * MHz,
	.frequency_stepsize_hz = 125 * kHz,
	.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_5_6 \| FE_CAN_FEC_6_7 \| FE_CAN_FEC_7_8 \| FE_CAN_FEC_AUTO \|
	FE_CAN_QPSK
	},

	.release = tda10086_release,

	.init = tda10086_init,
	.sleep = tda10086_sleep,
	.i2c_gate_ctrl = tda10086_i2c_gate_ctrl,

	.set_frontend = tda10086_set_frontend,
	.get_frontend = tda10086_get_frontend,
	.get_tune_settings = tda10086_get_tune_settings,

	.read_status = tda10086_read_status,
	.read_ber = tda10086_read_ber,
	.read_signal_strength = tda10086_read_signal_strength,
	.read_snr = tda10086_read_snr,
	.read_ucblocks = tda10086_read_ucblocks,

	.diseqc_send_master_cmd = tda10086_send_master_cmd,
	.diseqc_send_burst = tda10086_send_burst,
	.set_tone = tda10086_set_tone,
	};

	struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
	struct i2c_adapter* i2c)
	{
	struct tda10086_state *state;

	dprintk ("%s\n", __func__);

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct tda10086_state), GFP_KERNEL);
	if (!state)
	return NULL;

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

	/* check if the demod is there */
	if (tda10086_read_byte(state, 0x1e) != 0xe1) {
	kfree(state);
	return NULL;
	}

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &tda10086_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
	}

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

	MODULE_DESCRIPTION("Philips TDA10086 DVB-S Demodulator");
	MODULE_AUTHOR("Andrew de Quincey");
	MODULE_LICENSE("GPL");

	EXPORT_SYMBOL_GPL(tda10086_attach);