drivers/media/dvb/b2c2/flexcop-fe-tuner.c - kernel/msm-4.9 - Gitiles

 /*
  * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
  *
  * flexcop-fe-tuner.c - methods for attaching a frontend and controlling DiSEqC.
  *
  * see flexcop.c for copyright information.
  */
 #include <media/tuner.h>

 #include "flexcop.h"

 #include "stv0299.h"
 #include "mt352.h"
 #include "nxt200x.h"
 #include "bcm3510.h"
 #include "stv0297.h"
 #include "mt312.h"
 #include "lgdt330x.h"
 #include "dvb-pll.h"
 #include "tuner-simple.h"

 #include "s5h1420.h"
 #include "itd1000.h"

 #include "cx24123.h"
 #include "cx24113.h"

 #include "isl6421.h"

 /* lnb control */

 static int flexcop_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
 {
 	struct flexcop_device *fc = fe->dvb->priv;
 	flexcop_ibi_value v;
 	deb_tuner("polarity/voltage = %u\n", voltage);

 	v = fc->read_ibi_reg(fc, misc_204);
 	switch (voltage) {
 		case SEC_VOLTAGE_OFF:
 			v.misc_204.ACPI1_sig = 1;
 			break;
 		case SEC_VOLTAGE_13:
 			v.misc_204.ACPI1_sig = 0;
 			v.misc_204.LNB_L_H_sig = 0;
 			break;
 		case SEC_VOLTAGE_18:
 			v.misc_204.ACPI1_sig = 0;
 			v.misc_204.LNB_L_H_sig = 1;
 			break;
 		default:
 			err("unknown SEC_VOLTAGE value");
 			return -EINVAL;
 	}
 	return fc->write_ibi_reg(fc, misc_204, v);
 }

 static int flexcop_sleep(struct dvb_frontend* fe)
 {
 	struct flexcop_device *fc = fe->dvb->priv;
 /*	flexcop_ibi_value v = fc->read_ibi_reg(fc,misc_204); */

 	if (fc->fe_sleep)
 		return fc->fe_sleep(fe);

 /*	v.misc_204.ACPI3_sig = 1;
 	fc->write_ibi_reg(fc,misc_204,v);*/

 	return 0;
 }

 static int flexcop_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
 {
 	/* u16 wz_half_period_for_45_mhz[] = { 0x01ff, 0x0154, 0x00ff, 0x00cc }; */
 	struct flexcop_device *fc = fe->dvb->priv;
 	flexcop_ibi_value v;
 	u16 ax;
 	v.raw = 0;

 	deb_tuner("tone = %u\n",tone);

 	switch (tone) {
 		case SEC_TONE_ON:
 			ax = 0x01ff;
 			break;
 		case SEC_TONE_OFF:
 			ax = 0;
 			break;
 		default:
 			err("unknown SEC_TONE value");
 			return -EINVAL;
 	}

 	v.lnb_switch_freq_200.LNB_CTLPrescaler_sig = 1; /* divide by 2 */

 	v.lnb_switch_freq_200.LNB_CTLHighCount_sig = ax;
 	v.lnb_switch_freq_200.LNB_CTLLowCount_sig  = ax == 0 ? 0x1ff : ax;

 	return fc->write_ibi_reg(fc,lnb_switch_freq_200,v);
 }

 static void flexcop_diseqc_send_bit(struct dvb_frontend* fe, int data)
 {
 	flexcop_set_tone(fe, SEC_TONE_ON);
 	udelay(data ? 500 : 1000);
 	flexcop_set_tone(fe, SEC_TONE_OFF);
 	udelay(data ? 1000 : 500);
 }

 static void flexcop_diseqc_send_byte(struct dvb_frontend* fe, int data)
 {
 	int i, par = 1, d;

 	for (i = 7; i >= 0; i--) {
 		d = (data >> i) & 1;
 		par ^= d;
 		flexcop_diseqc_send_bit(fe, d);
 	}

 	flexcop_diseqc_send_bit(fe, par);
 }

 static int flexcop_send_diseqc_msg(struct dvb_frontend* fe, int len, u8 *msg, unsigned long burst)
 {
 	int i;

 	flexcop_set_tone(fe, SEC_TONE_OFF);
 	mdelay(16);

 	for (i = 0; i < len; i++)
 		flexcop_diseqc_send_byte(fe,msg[i]);

 	mdelay(16);

 	if (burst != -1) {
 		if (burst)
 			flexcop_diseqc_send_byte(fe, 0xff);
 		else {
 			flexcop_set_tone(fe, SEC_TONE_ON);
 			mdelay(12);
 			udelay(500);
 			flexcop_set_tone(fe, SEC_TONE_OFF);
 		}
 		msleep(20);
 	}
 	return 0;
 }

 static int flexcop_diseqc_send_master_cmd(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd* cmd)
 {
 	return flexcop_send_diseqc_msg(fe, cmd->msg_len, cmd->msg, 0);
 }

 static int flexcop_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t minicmd)
 {
 	return flexcop_send_diseqc_msg(fe, 0, NULL, minicmd);
 }

 /* dvb-s stv0299 */
 static int samsung_tbmu24112_set_symbol_rate(struct dvb_frontend* fe, u32 srate, u32 ratio)
 {
 	u8 aclk = 0;
 	u8 bclk = 0;

 	if (srate < 1500000) { aclk = 0xb7; bclk = 0x47; }
 	else if (srate < 3000000) { aclk = 0xb7; bclk = 0x4b; }
 	else if (srate < 7000000) { aclk = 0xb7; bclk = 0x4f; }
 	else if (srate < 14000000) { aclk = 0xb7; bclk = 0x53; }
 	else if (srate < 30000000) { aclk = 0xb6; bclk = 0x53; }
 	else if (srate < 45000000) { aclk = 0xb4; bclk = 0x51; }

 	stv0299_writereg (fe, 0x13, aclk);
 	stv0299_writereg (fe, 0x14, bclk);
 	stv0299_writereg (fe, 0x1f, (ratio >> 16) & 0xff);
 	stv0299_writereg (fe, 0x20, (ratio >>  8) & 0xff);
 	stv0299_writereg (fe, 0x21, (ratio      ) & 0xf0);

 	return 0;
 }

 static int samsung_tbmu24112_tuner_set_params(struct dvb_frontend* fe, struct dvb_frontend_parameters *params)
 {
 	u8 buf[4];
 	u32 div;
 	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = buf, .len = sizeof(buf) };
 	struct flexcop_device *fc = fe->dvb->priv;

 	div = params->frequency / 125;

 	buf[0] = (div >> 8) & 0x7f;
 	buf[1] = div & 0xff;
 	buf[2] = 0x84;  /* 0xC4 */
 	buf[3] = 0x08;

 	if (params->frequency < 1500000)
 		buf[3] |= 0x10;

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 1);
 	if (i2c_transfer(&fc->fc_i2c_adap[0].i2c_adap, &msg, 1) != 1)
 		return -EIO;
 	return 0;
 }

 static u8 samsung_tbmu24112_inittab[] = {
 	     0x01, 0x15,
 	     0x02, 0x30,
 	     0x03, 0x00,
 	     0x04, 0x7D,
 	     0x05, 0x35,
 	     0x06, 0x02,
 	     0x07, 0x00,
 	     0x08, 0xC3,
 	     0x0C, 0x00,
 	     0x0D, 0x81,
 	     0x0E, 0x23,
 	     0x0F, 0x12,
 	     0x10, 0x7E,
 	     0x11, 0x84,
 	     0x12, 0xB9,
 	     0x13, 0x88,
 	     0x14, 0x89,
 	     0x15, 0xC9,
 	     0x16, 0x00,
 	     0x17, 0x5C,
 	     0x18, 0x00,
 	     0x19, 0x00,
 	     0x1A, 0x00,
 	     0x1C, 0x00,
 	     0x1D, 0x00,
 	     0x1E, 0x00,
 	     0x1F, 0x3A,
 	     0x20, 0x2E,
 	     0x21, 0x80,
 	     0x22, 0xFF,
 	     0x23, 0xC1,
 	     0x28, 0x00,
 	     0x29, 0x1E,
 	     0x2A, 0x14,
 	     0x2B, 0x0F,
 	     0x2C, 0x09,
 	     0x2D, 0x05,
 	     0x31, 0x1F,
 	     0x32, 0x19,
 	     0x33, 0xFE,
 	     0x34, 0x93,
 	     0xff, 0xff,
 };

 static struct stv0299_config samsung_tbmu24112_config = {
 	.demod_address = 0x68,
 	.inittab = samsung_tbmu24112_inittab,
 	.mclk = 88000000UL,
 	.invert = 0,
 	.skip_reinit = 0,
 	.lock_output = STV0299_LOCKOUTPUT_LK,
 	.volt13_op0_op1 = STV0299_VOLT13_OP1,
 	.min_delay_ms = 100,
 	.set_symbol_rate = samsung_tbmu24112_set_symbol_rate,
 };

 /* dvb-t mt352 */
 static int samsung_tdtc9251dh0_demod_init(struct dvb_frontend* fe)
 {
 	static u8 mt352_clock_config [] = { 0x89, 0x18, 0x2d };
 	static u8 mt352_reset [] = { 0x50, 0x80 };
 	static u8 mt352_adc_ctl_1_cfg [] = { 0x8E, 0x40 };
 	static u8 mt352_agc_cfg [] = { 0x67, 0x28, 0xa1 };
 	static u8 mt352_capt_range_cfg[] = { 0x75, 0x32 };

 	mt352_write(fe, mt352_clock_config, sizeof(mt352_clock_config));
 	udelay(2000);
 	mt352_write(fe, mt352_reset, sizeof(mt352_reset));
 	mt352_write(fe, mt352_adc_ctl_1_cfg, sizeof(mt352_adc_ctl_1_cfg));

 	mt352_write(fe, mt352_agc_cfg, sizeof(mt352_agc_cfg));
 	mt352_write(fe, mt352_capt_range_cfg, sizeof(mt352_capt_range_cfg));

 	return 0;
 }

 static int samsung_tdtc9251dh0_calc_regs(struct dvb_frontend* fe, struct dvb_frontend_parameters *params, u8* pllbuf, int buf_len)
 {
 	u32 div;
 	unsigned char bs = 0;

 	if (buf_len < 5)
 		return -EINVAL;

 	#define IF_FREQUENCYx6 217    /* 6 * 36.16666666667MHz */
 	div = (((params->frequency + 83333) * 3) / 500000) + IF_FREQUENCYx6;

 	if (params->frequency >= 48000000 && params->frequency <= 154000000) bs = 0x09;
 	if (params->frequency >= 161000000 && params->frequency <= 439000000) bs = 0x0a;
 	if (params->frequency >= 447000000 && params->frequency <= 863000000) bs = 0x08;

 	pllbuf[0] = 0x61;
 	pllbuf[1] = div >> 8;
 	pllbuf[2] = div & 0xff;
 	pllbuf[3] = 0xcc;
 	pllbuf[4] = bs;

 	return 5;
 }

 static struct mt352_config samsung_tdtc9251dh0_config = {
 	.demod_address = 0x0f,
 	.demod_init    = samsung_tdtc9251dh0_demod_init,
 };

 static int flexcop_fe_request_firmware(struct dvb_frontend* fe, const struct firmware **fw, char* name)
 {
 	struct flexcop_device *fc = fe->dvb->priv;
 	return request_firmware(fw, name, fc->dev);
 }

 static struct lgdt330x_config air2pc_atsc_hd5000_config = {
 	.demod_address       = 0x59,
 	.demod_chip          = LGDT3303,
 	.serial_mpeg         = 0x04,
 	.clock_polarity_flip = 1,
 };

 static struct nxt200x_config samsung_tbmv_config = {
 	.demod_address    = 0x0a,
 };

 static struct bcm3510_config air2pc_atsc_first_gen_config = {
 	.demod_address    = 0x0f,
 	.request_firmware = flexcop_fe_request_firmware,
 };

 static int skystar23_samsung_tbdu18132_tuner_set_params(struct dvb_frontend* fe, struct dvb_frontend_parameters *params)
 {
 	u8 buf[4];
 	u32 div;
 	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = buf, .len = sizeof(buf) };
 	struct flexcop_device *fc = fe->dvb->priv;

 	div = (params->frequency + (125/2)) / 125;

 	buf[0] = (div >> 8) & 0x7f;
 	buf[1] = (div >> 0) & 0xff;
 	buf[2] = 0x84 | ((div >> 10) & 0x60);
 	buf[3] = 0x80;

 	if (params->frequency < 1550000)
 		buf[3] |= 0x02;

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 1);
 	if (i2c_transfer(&fc->fc_i2c_adap[0].i2c_adap, &msg, 1) != 1)
 		return -EIO;
 	return 0;
 }

 static struct mt312_config skystar23_samsung_tbdu18132_config = {

 	.demod_address = 0x0e,
 };

 static int alps_tdee4_stv0297_tuner_set_params(struct dvb_frontend* fe,
 					       struct dvb_frontend_parameters *fep)
 {
 	struct flexcop_device *fc = fe->dvb->priv;
 	u8 buf[4];
 	u16 div;
 	int ret;

 /*  62.5 kHz * 10 */
 #define REF_FREQ    625
 #define FREQ_OFFSET 36125

 	div = ((fep->frequency/1000 + FREQ_OFFSET ) * 10)  / REF_FREQ; // 4 MHz = 4000 KHz

 	buf[0] = (u8)( div >> 8) & 0x7f;
 	buf[1] = (u8)        div & 0xff;

 /* F(osc) = N * Reference Freq. (62.5 kHz)
  * byte 2 :  0 N14 N13 N12 N11 N10 N9  N8
  * byte 3 : N7 N6  N5  N4  N3  N2  N1  N0
  * byte 4 : 1  *   *   AGD R3  R2  R1  R0
  * byte 5 : C1 *   RE  RTS BS4 BS3 BS2 BS1
  * AGD = 1, R3 R2 R1 R0 = 0 1 0 1 => byte 4 = 1**10101 = 0x95 */
 	buf[2] = 0x95;

 // Range(MHz)  C1 *  RE RTS BS4 BS3 BS2 BS1  Byte 5
 //  47 - 153   0  *  0   0   0   0   0   1   0x01
 // 153 - 430   0  *  0   0   0   0   1   0   0x02
 // 430 - 822   0  *  0   0   1   0   0   0   0x08
 // 822 - 862   1  *  0   0   1   0   0   0   0x88

 	     if (fep->frequency <= 153000000) buf[3] = 0x01;
 	else if (fep->frequency <= 430000000) buf[3] = 0x02;
 	else if (fep->frequency <= 822000000) buf[3] = 0x08;
 	else buf[3] = 0x88;

 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0);
 	deb_tuner("tuner buffer for %d Hz: %x %x %x %x\n",fep->frequency, buf[0],buf[1],buf[2],buf[3]);
 	ret = fc->i2c_request(&fc->fc_i2c_adap[2],
 		FC_WRITE, 0x61, buf[0], &buf[1], 3);
 	deb_tuner("tuner write returned: %d\n",ret);

 	return ret;
 }

 static u8 alps_tdee4_stv0297_inittab[] = {
 	0x80, 0x01,
 	0x80, 0x00,
 	0x81, 0x01,
 	0x81, 0x00,
 	0x00, 0x48,
 	0x01, 0x58,
 	0x03, 0x00,
 	0x04, 0x00,
 	0x07, 0x00,
 	0x08, 0x00,
 	0x30, 0xff,
 	0x31, 0x9d,
 	0x32, 0xff,
 	0x33, 0x00,
 	0x34, 0x29,
 	0x35, 0x55,
 	0x36, 0x80,
 	0x37, 0x6e,
 	0x38, 0x9c,
 	0x40, 0x1a,
 	0x41, 0xfe,
 	0x42, 0x33,
 	0x43, 0x00,
 	0x44, 0xff,
 	0x45, 0x00,
 	0x46, 0x00,
 	0x49, 0x04,
 	0x4a, 0x51,
 	0x4b, 0xf8,
 	0x52, 0x30,
 	0x53, 0x06,
 	0x59, 0x06,
 	0x5a, 0x5e,
 	0x5b, 0x04,
 	0x61, 0x49,
 	0x62, 0x0a,
 	0x70, 0xff,
 	0x71, 0x04,
 	0x72, 0x00,
 	0x73, 0x00,
 	0x74, 0x0c,
 	0x80, 0x20,
 	0x81, 0x00,
 	0x82, 0x30,
 	0x83, 0x00,
 	0x84, 0x04,
 	0x85, 0x22,
 	0x86, 0x08,
 	0x87, 0x1b,
 	0x88, 0x00,
 	0x89, 0x00,
 	0x90, 0x00,
 	0x91, 0x04,
 	0xa0, 0x86,
 	0xa1, 0x00,
 	0xa2, 0x00,
 	0xb0, 0x91,
 	0xb1, 0x0b,
 	0xc0, 0x5b,
 	0xc1, 0x10,
 	0xc2, 0x12,
 	0xd0, 0x02,
 	0xd1, 0x00,
 	0xd2, 0x00,
 	0xd3, 0x00,
 	0xd4, 0x02,
 	0xd5, 0x00,
 	0xde, 0x00,
 	0xdf, 0x01,
 	0xff, 0xff,
 };

 static struct stv0297_config alps_tdee4_stv0297_config = {
 	.demod_address = 0x1c,
 	.inittab = alps_tdee4_stv0297_inittab,
 //	.invert = 1,
 //	.pll_set = alps_tdee4_stv0297_pll_set,
 };


 /* SkyStar2 rev2.7 (a/u) */
 static struct s5h1420_config skystar2_rev2_7_s5h1420_config = {
 	.demod_address = 0x53,
 	.invert = 1,
 	.repeated_start_workaround = 1,
 	.serial_mpeg = 1,
 };

 static struct itd1000_config skystar2_rev2_7_itd1000_config = {
 	.i2c_address = 0x61,
 };

 /* SkyStar2 rev2.8 */
 static struct cx24123_config skystar2_rev2_8_cx24123_config = {
 	.demod_address = 0x55,
 	.dont_use_pll = 1,
 	.agc_callback = cx24113_agc_callback,
 };

 static const struct cx24113_config skystar2_rev2_8_cx24113_config = {
 	.i2c_addr = 0x54,
 	.xtal_khz = 10111,
 };

 /* try to figure out the frontend, each card/box can have on of the following list */
 int flexcop_frontend_init(struct flexcop_device *fc)
 {
 	struct dvb_frontend_ops *ops;
 	struct i2c_adapter *i2c = &fc->fc_i2c_adap[0].i2c_adap;
 	struct i2c_adapter *i2c_tuner;

 	/* enable no_base_addr - no repeated start when reading */
 	fc->fc_i2c_adap[0].no_base_addr = 1;
 	fc->fe = dvb_attach(s5h1420_attach, &skystar2_rev2_7_s5h1420_config, i2c);
 	if (fc->fe != NULL) {
 		flexcop_ibi_value r108;
 		i2c_tuner = s5h1420_get_tuner_i2c_adapter(fc->fe);
 		ops = &fc->fe->ops;

 		fc->fe_sleep = ops->sleep;
 		ops->sleep   = flexcop_sleep;

 		fc->dev_type = FC_SKY_REV27;

 		/* enable no_base_addr - no repeated start when reading */
 		fc->fc_i2c_adap[2].no_base_addr = 1;
 		if (dvb_attach(isl6421_attach, fc->fe, &fc->fc_i2c_adap[2].i2c_adap, 0x08, 1, 1) == NULL)
 			err("ISL6421 could NOT be attached");
 		else
 			info("ISL6421 successfully attached");

 		/* the ITD1000 requires a lower i2c clock - it slows down the stuff for everyone - but is it a problem ? */
 		r108.raw = 0x00000506;
 		fc->write_ibi_reg(fc, tw_sm_c_108, r108);
 		if (i2c_tuner) {
 			if (dvb_attach(itd1000_attach, fc->fe, i2c_tuner, &skystar2_rev2_7_itd1000_config) == NULL)
 				err("ITD1000 could NOT be attached");
 			else
 				info("ITD1000 successfully attached");
 		}
 		goto fe_found;
 	}
 	fc->fc_i2c_adap[0].no_base_addr = 0; /* for the next devices we need it again */

 	/* try the sky v2.8 (cx24123, isl6421) */
 	fc->fe = dvb_attach(cx24123_attach,
 		&skystar2_rev2_8_cx24123_config, i2c);
 	if (fc->fe != NULL) {
 		i2c_tuner = cx24123_get_tuner_i2c_adapter(fc->fe);
 		if (i2c_tuner != NULL) {
 			if (dvb_attach(cx24113_attach, fc->fe,
 					&skystar2_rev2_8_cx24113_config,
 					i2c_tuner) == NULL)
 				err("CX24113 could NOT be attached");
 			else
 				info("CX24113 successfully attached");
 		}

 		fc->dev_type = FC_SKY_REV28;

 		fc->fc_i2c_adap[2].no_base_addr = 1;
 		if (dvb_attach(isl6421_attach, fc->fe,
 		       &fc->fc_i2c_adap[2].i2c_adap, 0x08, 0, 0) == NULL)
 			err("ISL6421 could NOT be attached");
 		else
 			info("ISL6421 successfully attached");

 		/* TODO on i2c_adap[1] addr 0x11 (EEPROM) there seems to be an
 		 * IR-receiver (PIC16F818) - but the card has no input for
 		 * that ??? */

 		goto fe_found;
     }

 	/* try the sky v2.6 (stv0299/Samsung tbmu24112(sl1935)) */
 	fc->fe = dvb_attach(stv0299_attach, &samsung_tbmu24112_config, i2c);
 	if (fc->fe != NULL) {
 		ops = &fc->fe->ops;

 		ops->tuner_ops.set_params = samsung_tbmu24112_tuner_set_params;

 		ops->set_voltage = flexcop_set_voltage;

 		fc->fe_sleep = ops->sleep;
 		ops->sleep = flexcop_sleep;

 		fc->dev_type = FC_SKY_REV26;
 		goto fe_found;
 	}

 	/* try the air dvb-t (mt352/Samsung tdtc9251dh0(??)) */
 	fc->fe = dvb_attach(mt352_attach, &samsung_tdtc9251dh0_config, i2c);
 	if (fc->fe != NULL) {
 		fc->dev_type = FC_AIR_DVBT;
 		fc->fe->ops.tuner_ops.calc_regs = samsung_tdtc9251dh0_calc_regs;
 		goto fe_found;
 	}

 	/* try the air atsc 2nd generation (nxt2002) */
 	fc->fe = dvb_attach(nxt200x_attach, &samsung_tbmv_config, i2c);
 	if (fc->fe != NULL) {
 		fc->dev_type = FC_AIR_ATSC2;
 		dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL, DVB_PLL_SAMSUNG_TBMV);
 		goto fe_found;
 	}

 	fc->fe = dvb_attach(lgdt330x_attach, &air2pc_atsc_hd5000_config, i2c);
 	if (fc->fe != NULL) {
 		fc->dev_type = FC_AIR_ATSC3;
 		dvb_attach(simple_tuner_attach, fc->fe, i2c, 0x61,
 				TUNER_LG_TDVS_H06XF);
 		goto fe_found;
 	}

 	/* try the air atsc 1nd generation (bcm3510)/panasonic ct10s */
 	fc->fe = dvb_attach(bcm3510_attach, &air2pc_atsc_first_gen_config, i2c);
 	if (fc->fe != NULL) {
 		fc->dev_type = FC_AIR_ATSC1;
 		goto fe_found;
 	}

 	/* try the cable dvb (stv0297) */
 	fc->fc_i2c_adap[0].no_base_addr = 1;
 	fc->fe = dvb_attach(stv0297_attach, &alps_tdee4_stv0297_config, i2c);
 	if (fc->fe != NULL) {
 		fc->dev_type = FC_CABLE;
 		fc->fe->ops.tuner_ops.set_params = alps_tdee4_stv0297_tuner_set_params;
 		goto fe_found;
 	}
 	fc->fc_i2c_adap[0].no_base_addr = 0;

 	/* try the sky v2.3 (vp310/Samsung tbdu18132(tsa5059)) */
 	fc->fe = dvb_attach(mt312_attach,
 		&skystar23_samsung_tbdu18132_config, i2c);
 	if (fc->fe != NULL) {
 		ops = &fc->fe->ops;

 		ops->tuner_ops.set_params = skystar23_samsung_tbdu18132_tuner_set_params;

 		ops->diseqc_send_master_cmd = flexcop_diseqc_send_master_cmd;
 		ops->diseqc_send_burst      = flexcop_diseqc_send_burst;
 		ops->set_tone               = flexcop_set_tone;
 		ops->set_voltage            = flexcop_set_voltage;

 		fc->fe_sleep                = ops->sleep;
 		ops->sleep                  = flexcop_sleep;

 		fc->dev_type                = FC_SKY_REV23;
 		goto fe_found;
 	}

 	err("no frontend driver found for this B2C2/FlexCop adapter");
 	return -ENODEV;

 fe_found:
 	info("found '%s' .", fc->fe->ops.info.name);
 	if (dvb_register_frontend(&fc->dvb_adapter, fc->fe)) {
 		err("frontend registration failed!");
 		ops = &fc->fe->ops;
 		if (ops->release != NULL)
 			ops->release(fc->fe);
 		fc->fe = NULL;
 		return -EINVAL;
 	}
 	fc->init_state |= FC_STATE_FE_INIT;
 	return 0;
 }

 void flexcop_frontend_exit(struct flexcop_device *fc)
 {
 	if (fc->init_state & FC_STATE_FE_INIT) {
 		dvb_unregister_frontend(fc->fe);
 		dvb_frontend_detach(fc->fe);
 	}

 	fc->init_state &= ~FC_STATE_FE_INIT;
 }
	/*
	* This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
	*
	* flexcop-fe-tuner.c - methods for attaching a frontend and controlling DiSEqC.
	*
	* see flexcop.c for copyright information.
	*/
	#include <media/tuner.h>

	#include "flexcop.h"

	#include "stv0299.h"
	#include "mt352.h"
	#include "nxt200x.h"
	#include "bcm3510.h"
	#include "stv0297.h"
	#include "mt312.h"
	#include "lgdt330x.h"
	#include "dvb-pll.h"
	#include "tuner-simple.h"

	#include "s5h1420.h"
	#include "itd1000.h"

	#include "cx24123.h"
	#include "cx24113.h"

	#include "isl6421.h"

	/* lnb control */

	static int flexcop_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
	{
	struct flexcop_device *fc = fe->dvb->priv;
	flexcop_ibi_value v;
	deb_tuner("polarity/voltage = %u\n", voltage);

	v = fc->read_ibi_reg(fc, misc_204);
	switch (voltage) {
	case SEC_VOLTAGE_OFF:
	v.misc_204.ACPI1_sig = 1;
	break;
	case SEC_VOLTAGE_13:
	v.misc_204.ACPI1_sig = 0;
	v.misc_204.LNB_L_H_sig = 0;
	break;
	case SEC_VOLTAGE_18:
	v.misc_204.ACPI1_sig = 0;
	v.misc_204.LNB_L_H_sig = 1;
	break;
	default:
	err("unknown SEC_VOLTAGE value");
	return -EINVAL;
	}
	return fc->write_ibi_reg(fc, misc_204, v);
	}

	static int flexcop_sleep(struct dvb_frontend* fe)
	{
	struct flexcop_device *fc = fe->dvb->priv;
	/* flexcop_ibi_value v = fc->read_ibi_reg(fc,misc_204); */

	if (fc->fe_sleep)
	return fc->fe_sleep(fe);

	/* v.misc_204.ACPI3_sig = 1;
	fc->write_ibi_reg(fc,misc_204,v);*/

	return 0;
	}

	static int flexcop_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
	{
	/* u16 wz_half_period_for_45_mhz[] = { 0x01ff, 0x0154, 0x00ff, 0x00cc }; */
	struct flexcop_device *fc = fe->dvb->priv;
	flexcop_ibi_value v;
	u16 ax;
	v.raw = 0;

	deb_tuner("tone = %u\n",tone);

	switch (tone) {
	case SEC_TONE_ON:
	ax = 0x01ff;
	break;
	case SEC_TONE_OFF:
	ax = 0;
	break;
	default:
	err("unknown SEC_TONE value");
	return -EINVAL;
	}

	v.lnb_switch_freq_200.LNB_CTLPrescaler_sig = 1; /* divide by 2 */

	v.lnb_switch_freq_200.LNB_CTLHighCount_sig = ax;
	v.lnb_switch_freq_200.LNB_CTLLowCount_sig = ax == 0 ? 0x1ff : ax;

	return fc->write_ibi_reg(fc,lnb_switch_freq_200,v);
	}

	static void flexcop_diseqc_send_bit(struct dvb_frontend* fe, int data)
	{
	flexcop_set_tone(fe, SEC_TONE_ON);
	udelay(data ? 500 : 1000);
	flexcop_set_tone(fe, SEC_TONE_OFF);
	udelay(data ? 1000 : 500);
	}

	static void flexcop_diseqc_send_byte(struct dvb_frontend* fe, int data)
	{
	int i, par = 1, d;

	for (i = 7; i >= 0; i--) {
	d = (data >> i) & 1;
	par ^= d;
	flexcop_diseqc_send_bit(fe, d);
	}

	flexcop_diseqc_send_bit(fe, par);
	}

	static int flexcop_send_diseqc_msg(struct dvb_frontend* fe, int len, u8 *msg, unsigned long burst)
	{
	int i;

	flexcop_set_tone(fe, SEC_TONE_OFF);
	mdelay(16);

	for (i = 0; i < len; i++)
	flexcop_diseqc_send_byte(fe,msg[i]);

	mdelay(16);

	if (burst != -1) {
	if (burst)
	flexcop_diseqc_send_byte(fe, 0xff);
	else {
	flexcop_set_tone(fe, SEC_TONE_ON);
	mdelay(12);
	udelay(500);
	flexcop_set_tone(fe, SEC_TONE_OFF);
	}
	msleep(20);
	}
	return 0;
	}

	static int flexcop_diseqc_send_master_cmd(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd* cmd)
	{
	return flexcop_send_diseqc_msg(fe, cmd->msg_len, cmd->msg, 0);
	}

	static int flexcop_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t minicmd)
	{
	return flexcop_send_diseqc_msg(fe, 0, NULL, minicmd);
	}

	/* dvb-s stv0299 */
	static int samsung_tbmu24112_set_symbol_rate(struct dvb_frontend* fe, u32 srate, u32 ratio)
	{
	u8 aclk = 0;
	u8 bclk = 0;

	if (srate < 1500000) { aclk = 0xb7; bclk = 0x47; }
	else if (srate < 3000000) { aclk = 0xb7; bclk = 0x4b; }
	else if (srate < 7000000) { aclk = 0xb7; bclk = 0x4f; }
	else if (srate < 14000000) { aclk = 0xb7; bclk = 0x53; }
	else if (srate < 30000000) { aclk = 0xb6; bclk = 0x53; }
	else if (srate < 45000000) { aclk = 0xb4; bclk = 0x51; }

	stv0299_writereg (fe, 0x13, aclk);
	stv0299_writereg (fe, 0x14, bclk);
	stv0299_writereg (fe, 0x1f, (ratio >> 16) & 0xff);
	stv0299_writereg (fe, 0x20, (ratio >> 8) & 0xff);
	stv0299_writereg (fe, 0x21, (ratio ) & 0xf0);

	return 0;
	}

	static int samsung_tbmu24112_tuner_set_params(struct dvb_frontend* fe, struct dvb_frontend_parameters *params)
	{
	u8 buf[4];
	u32 div;
	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = buf, .len = sizeof(buf) };
	struct flexcop_device *fc = fe->dvb->priv;

	div = params->frequency / 125;

	buf[0] = (div >> 8) & 0x7f;
	buf[1] = div & 0xff;
	buf[2] = 0x84; /* 0xC4 */
	buf[3] = 0x08;

	if (params->frequency < 1500000)
	buf[3] \|= 0x10;

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);
	if (i2c_transfer(&fc->fc_i2c_adap[0].i2c_adap, &msg, 1) != 1)
	return -EIO;
	return 0;
	}

	static u8 samsung_tbmu24112_inittab[] = {
	0x01, 0x15,
	0x02, 0x30,
	0x03, 0x00,
	0x04, 0x7D,
	0x05, 0x35,
	0x06, 0x02,
	0x07, 0x00,
	0x08, 0xC3,
	0x0C, 0x00,
	0x0D, 0x81,
	0x0E, 0x23,
	0x0F, 0x12,
	0x10, 0x7E,
	0x11, 0x84,
	0x12, 0xB9,
	0x13, 0x88,
	0x14, 0x89,
	0x15, 0xC9,
	0x16, 0x00,
	0x17, 0x5C,
	0x18, 0x00,
	0x19, 0x00,
	0x1A, 0x00,
	0x1C, 0x00,
	0x1D, 0x00,
	0x1E, 0x00,
	0x1F, 0x3A,
	0x20, 0x2E,
	0x21, 0x80,
	0x22, 0xFF,
	0x23, 0xC1,
	0x28, 0x00,
	0x29, 0x1E,
	0x2A, 0x14,
	0x2B, 0x0F,
	0x2C, 0x09,
	0x2D, 0x05,
	0x31, 0x1F,
	0x32, 0x19,
	0x33, 0xFE,
	0x34, 0x93,
	0xff, 0xff,
	};

	static struct stv0299_config samsung_tbmu24112_config = {
	.demod_address = 0x68,
	.inittab = samsung_tbmu24112_inittab,
	.mclk = 88000000UL,
	.invert = 0,
	.skip_reinit = 0,
	.lock_output = STV0299_LOCKOUTPUT_LK,
	.volt13_op0_op1 = STV0299_VOLT13_OP1,
	.min_delay_ms = 100,
	.set_symbol_rate = samsung_tbmu24112_set_symbol_rate,
	};

	/* dvb-t mt352 */
	static int samsung_tdtc9251dh0_demod_init(struct dvb_frontend* fe)
	{
	static u8 mt352_clock_config [] = { 0x89, 0x18, 0x2d };
	static u8 mt352_reset [] = { 0x50, 0x80 };
	static u8 mt352_adc_ctl_1_cfg [] = { 0x8E, 0x40 };
	static u8 mt352_agc_cfg [] = { 0x67, 0x28, 0xa1 };
	static u8 mt352_capt_range_cfg[] = { 0x75, 0x32 };

	mt352_write(fe, mt352_clock_config, sizeof(mt352_clock_config));
	udelay(2000);
	mt352_write(fe, mt352_reset, sizeof(mt352_reset));
	mt352_write(fe, mt352_adc_ctl_1_cfg, sizeof(mt352_adc_ctl_1_cfg));

	mt352_write(fe, mt352_agc_cfg, sizeof(mt352_agc_cfg));
	mt352_write(fe, mt352_capt_range_cfg, sizeof(mt352_capt_range_cfg));

	return 0;
	}

	static int samsung_tdtc9251dh0_calc_regs(struct dvb_frontend* fe, struct dvb_frontend_parameters params, u8 pllbuf, int buf_len)
	{
	u32 div;
	unsigned char bs = 0;

	if (buf_len < 5)
	return -EINVAL;

	#define IF_FREQUENCYx6 217 /* 6 * 36.16666666667MHz */
	div = (((params->frequency + 83333) * 3) / 500000) + IF_FREQUENCYx6;

	if (params->frequency >= 48000000 && params->frequency <= 154000000) bs = 0x09;
	if (params->frequency >= 161000000 && params->frequency <= 439000000) bs = 0x0a;
	if (params->frequency >= 447000000 && params->frequency <= 863000000) bs = 0x08;

	pllbuf[0] = 0x61;
	pllbuf[1] = div >> 8;
	pllbuf[2] = div & 0xff;
	pllbuf[3] = 0xcc;
	pllbuf[4] = bs;

	return 5;
	}

	static struct mt352_config samsung_tdtc9251dh0_config = {
	.demod_address = 0x0f,
	.demod_init = samsung_tdtc9251dh0_demod_init,
	};

	static int flexcop_fe_request_firmware(struct dvb_frontend* fe, const struct firmware *fw, char name)
	{
	struct flexcop_device *fc = fe->dvb->priv;
	return request_firmware(fw, name, fc->dev);
	}

	static struct lgdt330x_config air2pc_atsc_hd5000_config = {
	.demod_address = 0x59,
	.demod_chip = LGDT3303,
	.serial_mpeg = 0x04,
	.clock_polarity_flip = 1,
	};

	static struct nxt200x_config samsung_tbmv_config = {
	.demod_address = 0x0a,
	};

	static struct bcm3510_config air2pc_atsc_first_gen_config = {
	.demod_address = 0x0f,
	.request_firmware = flexcop_fe_request_firmware,
	};

	static int skystar23_samsung_tbdu18132_tuner_set_params(struct dvb_frontend* fe, struct dvb_frontend_parameters *params)
	{
	u8 buf[4];
	u32 div;
	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = buf, .len = sizeof(buf) };
	struct flexcop_device *fc = fe->dvb->priv;

	div = (params->frequency + (125/2)) / 125;

	buf[0] = (div >> 8) & 0x7f;
	buf[1] = (div >> 0) & 0xff;
	buf[2] = 0x84 \| ((div >> 10) & 0x60);
	buf[3] = 0x80;

	if (params->frequency < 1550000)
	buf[3] \|= 0x02;

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);
	if (i2c_transfer(&fc->fc_i2c_adap[0].i2c_adap, &msg, 1) != 1)
	return -EIO;
	return 0;
	}

	static struct mt312_config skystar23_samsung_tbdu18132_config = {

	.demod_address = 0x0e,
	};

	static int alps_tdee4_stv0297_tuner_set_params(struct dvb_frontend* fe,
	struct dvb_frontend_parameters *fep)
	{
	struct flexcop_device *fc = fe->dvb->priv;
	u8 buf[4];
	u16 div;
	int ret;

	/* 62.5 kHz * 10 */
	#define REF_FREQ 625
	#define FREQ_OFFSET 36125

	div = ((fep->frequency/1000 + FREQ_OFFSET ) * 10) / REF_FREQ; // 4 MHz = 4000 KHz

	buf[0] = (u8)( div >> 8) & 0x7f;
	buf[1] = (u8) div & 0xff;

	/* F(osc) = N * Reference Freq. (62.5 kHz)
	* byte 2 : 0 N14 N13 N12 N11 N10 N9 N8
	* byte 3 : N7 N6 N5 N4 N3 N2 N1 N0
	* byte 4 : 1 * * AGD R3 R2 R1 R0
	* byte 5 : C1 * RE RTS BS4 BS3 BS2 BS1
	* AGD = 1, R3 R2 R1 R0 = 0 1 0 1 => byte 4 = 1*10101 = 0x95 /
	buf[2] = 0x95;

	// Range(MHz) C1 * RE RTS BS4 BS3 BS2 BS1 Byte 5
	// 47 - 153 0 * 0 0 0 0 0 1 0x01
	// 153 - 430 0 * 0 0 0 0 1 0 0x02
	// 430 - 822 0 * 0 0 1 0 0 0 0x08
	// 822 - 862 1 * 0 0 1 0 0 0 0x88

	if (fep->frequency <= 153000000) buf[3] = 0x01;
	else if (fep->frequency <= 430000000) buf[3] = 0x02;
	else if (fep->frequency <= 822000000) buf[3] = 0x08;
	else buf[3] = 0x88;

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	deb_tuner("tuner buffer for %d Hz: %x %x %x %x\n",fep->frequency, buf[0],buf[1],buf[2],buf[3]);
	ret = fc->i2c_request(&fc->fc_i2c_adap[2],
	FC_WRITE, 0x61, buf[0], &buf[1], 3);
	deb_tuner("tuner write returned: %d\n",ret);

	return ret;
	}

	static u8 alps_tdee4_stv0297_inittab[] = {
	0x80, 0x01,
	0x80, 0x00,
	0x81, 0x01,
	0x81, 0x00,
	0x00, 0x48,
	0x01, 0x58,
	0x03, 0x00,
	0x04, 0x00,
	0x07, 0x00,
	0x08, 0x00,
	0x30, 0xff,
	0x31, 0x9d,
	0x32, 0xff,
	0x33, 0x00,
	0x34, 0x29,
	0x35, 0x55,
	0x36, 0x80,
	0x37, 0x6e,
	0x38, 0x9c,
	0x40, 0x1a,
	0x41, 0xfe,
	0x42, 0x33,
	0x43, 0x00,
	0x44, 0xff,
	0x45, 0x00,
	0x46, 0x00,
	0x49, 0x04,
	0x4a, 0x51,
	0x4b, 0xf8,
	0x52, 0x30,
	0x53, 0x06,
	0x59, 0x06,
	0x5a, 0x5e,
	0x5b, 0x04,
	0x61, 0x49,
	0x62, 0x0a,
	0x70, 0xff,
	0x71, 0x04,
	0x72, 0x00,
	0x73, 0x00,
	0x74, 0x0c,
	0x80, 0x20,
	0x81, 0x00,
	0x82, 0x30,
	0x83, 0x00,
	0x84, 0x04,
	0x85, 0x22,
	0x86, 0x08,
	0x87, 0x1b,
	0x88, 0x00,
	0x89, 0x00,
	0x90, 0x00,
	0x91, 0x04,
	0xa0, 0x86,
	0xa1, 0x00,
	0xa2, 0x00,
	0xb0, 0x91,
	0xb1, 0x0b,
	0xc0, 0x5b,
	0xc1, 0x10,
	0xc2, 0x12,
	0xd0, 0x02,
	0xd1, 0x00,
	0xd2, 0x00,
	0xd3, 0x00,
	0xd4, 0x02,
	0xd5, 0x00,
	0xde, 0x00,
	0xdf, 0x01,
	0xff, 0xff,
	};

	static struct stv0297_config alps_tdee4_stv0297_config = {
	.demod_address = 0x1c,
	.inittab = alps_tdee4_stv0297_inittab,
	// .invert = 1,
	// .pll_set = alps_tdee4_stv0297_pll_set,
	};


	/* SkyStar2 rev2.7 (a/u) */
	static struct s5h1420_config skystar2_rev2_7_s5h1420_config = {
	.demod_address = 0x53,
	.invert = 1,
	.repeated_start_workaround = 1,
	.serial_mpeg = 1,
	};

	static struct itd1000_config skystar2_rev2_7_itd1000_config = {
	.i2c_address = 0x61,
	};

	/* SkyStar2 rev2.8 */
	static struct cx24123_config skystar2_rev2_8_cx24123_config = {
	.demod_address = 0x55,
	.dont_use_pll = 1,
	.agc_callback = cx24113_agc_callback,
	};

	static const struct cx24113_config skystar2_rev2_8_cx24113_config = {
	.i2c_addr = 0x54,
	.xtal_khz = 10111,
	};

	/* try to figure out the frontend, each card/box can have on of the following list */
	int flexcop_frontend_init(struct flexcop_device *fc)
	{
	struct dvb_frontend_ops *ops;
	struct i2c_adapter *i2c = &fc->fc_i2c_adap[0].i2c_adap;
	struct i2c_adapter *i2c_tuner;

	/* enable no_base_addr - no repeated start when reading */
	fc->fc_i2c_adap[0].no_base_addr = 1;
	fc->fe = dvb_attach(s5h1420_attach, &skystar2_rev2_7_s5h1420_config, i2c);
	if (fc->fe != NULL) {
	flexcop_ibi_value r108;
	i2c_tuner = s5h1420_get_tuner_i2c_adapter(fc->fe);
	ops = &fc->fe->ops;

	fc->fe_sleep = ops->sleep;
	ops->sleep = flexcop_sleep;

	fc->dev_type = FC_SKY_REV27;

	/* enable no_base_addr - no repeated start when reading */
	fc->fc_i2c_adap[2].no_base_addr = 1;
	if (dvb_attach(isl6421_attach, fc->fe, &fc->fc_i2c_adap[2].i2c_adap, 0x08, 1, 1) == NULL)
	err("ISL6421 could NOT be attached");
	else
	info("ISL6421 successfully attached");

	/* the ITD1000 requires a lower i2c clock - it slows down the stuff for everyone - but is it a problem ? */
	r108.raw = 0x00000506;
	fc->write_ibi_reg(fc, tw_sm_c_108, r108);
	if (i2c_tuner) {
	if (dvb_attach(itd1000_attach, fc->fe, i2c_tuner, &skystar2_rev2_7_itd1000_config) == NULL)
	err("ITD1000 could NOT be attached");
	else
	info("ITD1000 successfully attached");
	}
	goto fe_found;
	}
	fc->fc_i2c_adap[0].no_base_addr = 0; /* for the next devices we need it again */

	/* try the sky v2.8 (cx24123, isl6421) */
	fc->fe = dvb_attach(cx24123_attach,
	&skystar2_rev2_8_cx24123_config, i2c);
	if (fc->fe != NULL) {
	i2c_tuner = cx24123_get_tuner_i2c_adapter(fc->fe);
	if (i2c_tuner != NULL) {
	if (dvb_attach(cx24113_attach, fc->fe,
	&skystar2_rev2_8_cx24113_config,
	i2c_tuner) == NULL)
	err("CX24113 could NOT be attached");
	else
	info("CX24113 successfully attached");
	}

	fc->dev_type = FC_SKY_REV28;

	fc->fc_i2c_adap[2].no_base_addr = 1;
	if (dvb_attach(isl6421_attach, fc->fe,
	&fc->fc_i2c_adap[2].i2c_adap, 0x08, 0, 0) == NULL)
	err("ISL6421 could NOT be attached");
	else
	info("ISL6421 successfully attached");

	/* TODO on i2c_adap[1] addr 0x11 (EEPROM) there seems to be an
	* IR-receiver (PIC16F818) - but the card has no input for
	* that ??? */

	goto fe_found;
	}

	/* try the sky v2.6 (stv0299/Samsung tbmu24112(sl1935)) */
	fc->fe = dvb_attach(stv0299_attach, &samsung_tbmu24112_config, i2c);
	if (fc->fe != NULL) {
	ops = &fc->fe->ops;

	ops->tuner_ops.set_params = samsung_tbmu24112_tuner_set_params;

	ops->set_voltage = flexcop_set_voltage;

	fc->fe_sleep = ops->sleep;
	ops->sleep = flexcop_sleep;

	fc->dev_type = FC_SKY_REV26;
	goto fe_found;
	}

	/* try the air dvb-t (mt352/Samsung tdtc9251dh0(??)) */
	fc->fe = dvb_attach(mt352_attach, &samsung_tdtc9251dh0_config, i2c);
	if (fc->fe != NULL) {
	fc->dev_type = FC_AIR_DVBT;
	fc->fe->ops.tuner_ops.calc_regs = samsung_tdtc9251dh0_calc_regs;
	goto fe_found;
	}

	/* try the air atsc 2nd generation (nxt2002) */
	fc->fe = dvb_attach(nxt200x_attach, &samsung_tbmv_config, i2c);
	if (fc->fe != NULL) {
	fc->dev_type = FC_AIR_ATSC2;
	dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL, DVB_PLL_SAMSUNG_TBMV);
	goto fe_found;
	}

	fc->fe = dvb_attach(lgdt330x_attach, &air2pc_atsc_hd5000_config, i2c);
	if (fc->fe != NULL) {
	fc->dev_type = FC_AIR_ATSC3;
	dvb_attach(simple_tuner_attach, fc->fe, i2c, 0x61,
	TUNER_LG_TDVS_H06XF);
	goto fe_found;
	}

	/* try the air atsc 1nd generation (bcm3510)/panasonic ct10s */
	fc->fe = dvb_attach(bcm3510_attach, &air2pc_atsc_first_gen_config, i2c);
	if (fc->fe != NULL) {
	fc->dev_type = FC_AIR_ATSC1;
	goto fe_found;
	}

	/* try the cable dvb (stv0297) */
	fc->fc_i2c_adap[0].no_base_addr = 1;
	fc->fe = dvb_attach(stv0297_attach, &alps_tdee4_stv0297_config, i2c);
	if (fc->fe != NULL) {
	fc->dev_type = FC_CABLE;
	fc->fe->ops.tuner_ops.set_params = alps_tdee4_stv0297_tuner_set_params;
	goto fe_found;
	}
	fc->fc_i2c_adap[0].no_base_addr = 0;

	/* try the sky v2.3 (vp310/Samsung tbdu18132(tsa5059)) */
	fc->fe = dvb_attach(mt312_attach,
	&skystar23_samsung_tbdu18132_config, i2c);
	if (fc->fe != NULL) {
	ops = &fc->fe->ops;

	ops->tuner_ops.set_params = skystar23_samsung_tbdu18132_tuner_set_params;

	ops->diseqc_send_master_cmd = flexcop_diseqc_send_master_cmd;
	ops->diseqc_send_burst = flexcop_diseqc_send_burst;
	ops->set_tone = flexcop_set_tone;
	ops->set_voltage = flexcop_set_voltage;

	fc->fe_sleep = ops->sleep;
	ops->sleep = flexcop_sleep;

	fc->dev_type = FC_SKY_REV23;
	goto fe_found;
	}

	err("no frontend driver found for this B2C2/FlexCop adapter");
	return -ENODEV;

	fe_found:
	info("found '%s' .", fc->fe->ops.info.name);
	if (dvb_register_frontend(&fc->dvb_adapter, fc->fe)) {
	err("frontend registration failed!");
	ops = &fc->fe->ops;
	if (ops->release != NULL)
	ops->release(fc->fe);
	fc->fe = NULL;
	return -EINVAL;
	}
	fc->init_state \|= FC_STATE_FE_INIT;
	return 0;
	}

	void flexcop_frontend_exit(struct flexcop_device *fc)
	{
	if (fc->init_state & FC_STATE_FE_INIT) {
	dvb_unregister_frontend(fc->fe);
	dvb_frontend_detach(fc->fe);
	}

	fc->init_state &= ~FC_STATE_FE_INIT;
	}