drivers/media/common/b2c2/flexcop-fe-tuner.c - linux-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
  * flexcop-fe-tuner.c - methods for frontend attachment and DiSEqC controlling
  * see flexcop.c for copyright information
  */
 #include <media/tuner.h>
 #include "flexcop.h"
 #include "mt312.h"
 #include "stv0299.h"
 #include "s5h1420.h"
 #include "itd1000.h"
 #include "cx24113.h"
 #include "cx24123.h"
 #include "isl6421.h"
 #include "cx24120.h"
 #include "mt352.h"
 #include "bcm3510.h"
 #include "nxt200x.h"
 #include "dvb-pll.h"
 #include "lgdt330x.h"
 #include "tuner-simple.h"
 #include "stv0297.h"


 /* Can we use the specified front-end?  Remember that if we are compiled
  * into the kernel we can't call code that's in modules.  */
 #define FE_SUPPORTED(fe) IS_REACHABLE(CONFIG_DVB_ ## fe)

 #if FE_SUPPORTED(BCM3510) || (FE_SUPPORTED(CX24120) && FE_SUPPORTED(ISL6421))
 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);
 }
 #endif

 /* lnb control */
 #if (FE_SUPPORTED(MT312) || FE_SUPPORTED(STV0299)) && FE_SUPPORTED(PLL)
 static int flexcop_set_voltage(struct dvb_frontend *fe,
 			       enum fe_sec_voltage 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);
 }
 #endif

 #if FE_SUPPORTED(S5H1420) || FE_SUPPORTED(STV0299) || FE_SUPPORTED(MT312)
 static int __maybe_unused flexcop_sleep(struct dvb_frontend* fe)
 {
 	struct flexcop_device *fc = fe->dvb->priv;
 	if (fc->fe_sleep)
 		return fc->fe_sleep(fe);
 	return 0;
 }
 #endif

 /* SkyStar2 DVB-S rev 2.3 */
 #if FE_SUPPORTED(MT312) && FE_SUPPORTED(PLL)
 static int flexcop_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode 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,
 				     enum fe_sec_mini_cmd minicmd)
 {
 	return flexcop_send_diseqc_msg(fe, 0, NULL, minicmd);
 }

 static struct mt312_config skystar23_samsung_tbdu18132_config = {
 	.demod_address = 0x0e,
 };

 static int skystar2_rev23_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	struct dvb_frontend_ops *ops;

 	fc->fe = dvb_attach(mt312_attach, &skystar23_samsung_tbdu18132_config, i2c);
 	if (!fc->fe)
 		return 0;

 	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61, i2c,
 			DVB_PLL_SAMSUNG_TBDU18132))
 		return 0;

 	ops = &fc->fe->ops;
 	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;
 	return 1;
 }
 #else
 #define skystar2_rev23_attach NULL
 #endif

 /* SkyStar2 DVB-S rev 2.6 */
 #if FE_SUPPORTED(STV0299) && FE_SUPPORTED(PLL)
 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 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,
 };

 static int skystar2_rev26_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(stv0299_attach, &samsung_tbmu24112_config, i2c);
 	if (!fc->fe)
 		return 0;

 	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61, i2c,
 			DVB_PLL_SAMSUNG_TBMU24112))
 		return 0;

 	fc->fe->ops.set_voltage = flexcop_set_voltage;
 	fc->fe_sleep = fc->fe->ops.sleep;
 	fc->fe->ops.sleep = flexcop_sleep;
 	return 1;

 }
 #else
 #define skystar2_rev26_attach NULL
 #endif

 /* SkyStar2 DVB-S rev 2.7 */
 #if FE_SUPPORTED(S5H1420) && FE_SUPPORTED(ISL6421) && FE_SUPPORTED(TUNER_ITD1000)
 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,
 };

 static int skystar2_rev27_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	flexcop_ibi_value r108;
 	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)
 		goto fail;

 	i2c_tuner = s5h1420_get_tuner_i2c_adapter(fc->fe);
 	if (!i2c_tuner)
 		goto fail;

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

 	/* 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, false)) {
 		err("ISL6421 could NOT be attached");
 		goto fail_isl;
 	}
 	info("ISL6421 successfully attached");

 	/* the ITD1000 requires a lower i2c clock - is it a problem ? */
 	r108.raw = 0x00000506;
 	fc->write_ibi_reg(fc, tw_sm_c_108, r108);
 	if (!dvb_attach(itd1000_attach, fc->fe, i2c_tuner,
 			&skystar2_rev2_7_itd1000_config)) {
 		err("ITD1000 could NOT be attached");
 		/* Should i2c clock be restored? */
 		goto fail_isl;
 	}
 	info("ITD1000 successfully attached");

 	return 1;

 fail_isl:
 	fc->fc_i2c_adap[2].no_base_addr = 0;
 fail:
 	/* for the next devices we need it again */
 	fc->fc_i2c_adap[0].no_base_addr = 0;
 	return 0;
 }
 #else
 #define skystar2_rev27_attach NULL
 #endif

 /* SkyStar2 rev 2.8 */
 #if FE_SUPPORTED(CX24123) && FE_SUPPORTED(ISL6421) && FE_SUPPORTED(TUNER_CX24113)
 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,
 };

 static int skystar2_rev28_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	struct i2c_adapter *i2c_tuner;

 	fc->fe = dvb_attach(cx24123_attach, &skystar2_rev2_8_cx24123_config,
 			    i2c);
 	if (!fc->fe)
 		return 0;

 	i2c_tuner = cx24123_get_tuner_i2c_adapter(fc->fe);
 	if (!i2c_tuner)
 		return 0;

 	if (!dvb_attach(cx24113_attach, fc->fe, &skystar2_rev2_8_cx24113_config,
 			i2c_tuner)) {
 		err("CX24113 could NOT be attached");
 		return 0;
 	}
 	info("CX24113 successfully attached");

 	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, false)) {
 		err("ISL6421 could NOT be attached");
 		fc->fc_i2c_adap[2].no_base_addr = 0;
 		return 0;
 	}
 	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 ??? */
 	return 1;
 }
 #else
 #define skystar2_rev28_attach NULL
 #endif

 /* AirStar DVB-T */
 #if FE_SUPPORTED(MT352) && FE_SUPPORTED(PLL)
 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 struct mt352_config samsung_tdtc9251dh0_config = {
 	.demod_address = 0x0f,
 	.demod_init    = samsung_tdtc9251dh0_demod_init,
 };

 static int airstar_dvbt_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(mt352_attach, &samsung_tdtc9251dh0_config, i2c);
 	if (!fc->fe)
 		return 0;

 	return !!dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL,
 			    DVB_PLL_SAMSUNG_TDTC9251DH0);
 }
 #else
 #define airstar_dvbt_attach NULL
 #endif

 /* AirStar ATSC 1st generation */
 #if FE_SUPPORTED(BCM3510)
 static struct bcm3510_config air2pc_atsc_first_gen_config = {
 	.demod_address    = 0x0f,
 	.request_firmware = flexcop_fe_request_firmware,
 };

 static int airstar_atsc1_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(bcm3510_attach, &air2pc_atsc_first_gen_config, i2c);
 	return fc->fe != NULL;
 }
 #else
 #define airstar_atsc1_attach NULL
 #endif

 /* AirStar ATSC 2nd generation */
 #if FE_SUPPORTED(NXT200X) && FE_SUPPORTED(PLL)
 static const struct nxt200x_config samsung_tbmv_config = {
 	.demod_address = 0x0a,
 };

 static int airstar_atsc2_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(nxt200x_attach, &samsung_tbmv_config, i2c);
 	if (!fc->fe)
 		return 0;

 	return !!dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL,
 			    DVB_PLL_SAMSUNG_TBMV);
 }
 #else
 #define airstar_atsc2_attach NULL
 #endif

 /* AirStar ATSC 3rd generation */
 #if FE_SUPPORTED(LGDT330X)
 static struct lgdt330x_config air2pc_atsc_hd5000_config = {
 	.demod_address       = 0x59,
 	.demod_chip          = LGDT3303,
 	.serial_mpeg         = 0x04,
 	.clock_polarity_flip = 1,
 };

 static int airstar_atsc3_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(lgdt330x_attach, &air2pc_atsc_hd5000_config, i2c);
 	if (!fc->fe)
 		return 0;

 	return !!dvb_attach(simple_tuner_attach, fc->fe, i2c, 0x61,
 			    TUNER_LG_TDVS_H06XF);
 }
 #else
 #define airstar_atsc3_attach NULL
 #endif

 /* CableStar2 DVB-C */
 #if FE_SUPPORTED(STV0297) && FE_SUPPORTED(PLL)
 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,
 };

 static int cablestar2_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fc_i2c_adap[0].no_base_addr = 1;
 	fc->fe = dvb_attach(stv0297_attach, &alps_tdee4_stv0297_config, i2c);
 	if (!fc->fe)
 		goto fail;

 	/* This tuner doesn't use the stv0297's I2C gate, but instead the
 	 * tuner is connected to a different flexcop I2C adapter.  */
 	if (fc->fe->ops.i2c_gate_ctrl)
 		fc->fe->ops.i2c_gate_ctrl(fc->fe, 0);
 	fc->fe->ops.i2c_gate_ctrl = NULL;

 	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61,
 			&fc->fc_i2c_adap[2].i2c_adap, DVB_PLL_TDEE4))
 		goto fail;

 	return 1;

 fail:
 	/* Reset for next frontend to try */
 	fc->fc_i2c_adap[0].no_base_addr = 0;
 	return 0;
 }
 #else
 #define cablestar2_attach NULL
 #endif

 /* SkyStar S2 PCI DVB-S/S2 card based on Conexant cx24120/cx24118 */
 #if FE_SUPPORTED(CX24120) && FE_SUPPORTED(ISL6421)
 static const struct cx24120_config skystar2_rev3_3_cx24120_config = {
 	.i2c_addr = 0x55,
 	.xtal_khz = 10111,
 	.initial_mpeg_config = { 0xa1, 0x76, 0x07 },
 	.request_firmware = flexcop_fe_request_firmware,
 	.i2c_wr_max = 4,
 };

 static int skystarS2_rev33_attach(struct flexcop_device *fc,
 	struct i2c_adapter *i2c)
 {
 	fc->fe = dvb_attach(cx24120_attach,
 			    &skystar2_rev3_3_cx24120_config, i2c);
 	if (!fc->fe)
 		return 0;

 	fc->dev_type = FC_SKYS2_REV33;
 	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, false)) {
 		err("ISL6421 could NOT be attached!");
 		fc->fc_i2c_adap[2].no_base_addr = 0;
 		return 0;
 	}
 	info("ISL6421 successfully attached.");

 	if (fc->has_32_hw_pid_filter)
 		fc->skip_6_hw_pid_filter = 1;

 	return 1;
 }
 #else
 #define skystarS2_rev33_attach NULL
 #endif

 static struct {
 	flexcop_device_type_t type;
 	int (*attach)(struct flexcop_device *, struct i2c_adapter *);
 } flexcop_frontends[] = {
 	{ FC_SKY_REV27, skystar2_rev27_attach },
 	{ FC_SKY_REV28, skystar2_rev28_attach },
 	{ FC_SKY_REV26, skystar2_rev26_attach },
 	{ FC_AIR_DVBT, airstar_dvbt_attach },
 	{ FC_AIR_ATSC2, airstar_atsc2_attach },
 	{ FC_AIR_ATSC3, airstar_atsc3_attach },
 	{ FC_AIR_ATSC1, airstar_atsc1_attach },
 	{ FC_CABLE, cablestar2_attach },
 	{ FC_SKY_REV23, skystar2_rev23_attach },
 	{ FC_SKYS2_REV33, skystarS2_rev33_attach },
 };

 /* try to figure out the frontend */
 int flexcop_frontend_init(struct flexcop_device *fc)
 {
 	int i;
 	for (i = 0; i < ARRAY_SIZE(flexcop_frontends); i++) {
 		if (!flexcop_frontends[i].attach)
 			continue;
 		/* type needs to be set before, because of some workarounds
 		 * done based on the probed card type */
 		fc->dev_type = flexcop_frontends[i].type;
 		if (flexcop_frontends[i].attach(fc, &fc->fc_i2c_adap[0].i2c_adap))
 			goto fe_found;
 		/* Clean up partially attached frontend */
 		if (fc->fe) {
 			dvb_frontend_detach(fc->fe);
 			fc->fe = NULL;
 		}
 	}
 	fc->dev_type = FC_UNK;
 	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!");
 		dvb_frontend_detach(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;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
	* flexcop-fe-tuner.c - methods for frontend attachment and DiSEqC controlling
	* see flexcop.c for copyright information
	*/
	#include <media/tuner.h>
	#include "flexcop.h"
	#include "mt312.h"
	#include "stv0299.h"
	#include "s5h1420.h"
	#include "itd1000.h"
	#include "cx24113.h"
	#include "cx24123.h"
	#include "isl6421.h"
	#include "cx24120.h"
	#include "mt352.h"
	#include "bcm3510.h"
	#include "nxt200x.h"
	#include "dvb-pll.h"
	#include "lgdt330x.h"
	#include "tuner-simple.h"
	#include "stv0297.h"


	/* Can we use the specified front-end? Remember that if we are compiled
	* into the kernel we can't call code that's in modules. */
	#define FE_SUPPORTED(fe) IS_REACHABLE(CONFIG_DVB_ ## fe)

	#if FE_SUPPORTED(BCM3510) \|\| (FE_SUPPORTED(CX24120) && FE_SUPPORTED(ISL6421))
	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);
	}
	#endif

	/* lnb control */
	#if (FE_SUPPORTED(MT312) \|\| FE_SUPPORTED(STV0299)) && FE_SUPPORTED(PLL)
	static int flexcop_set_voltage(struct dvb_frontend *fe,
	enum fe_sec_voltage 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);
	}
	#endif

	#if FE_SUPPORTED(S5H1420) \|\| FE_SUPPORTED(STV0299) \|\| FE_SUPPORTED(MT312)
	static int __maybe_unused flexcop_sleep(struct dvb_frontend* fe)
	{
	struct flexcop_device *fc = fe->dvb->priv;
	if (fc->fe_sleep)
	return fc->fe_sleep(fe);
	return 0;
	}
	#endif

	/* SkyStar2 DVB-S rev 2.3 */
	#if FE_SUPPORTED(MT312) && FE_SUPPORTED(PLL)
	static int flexcop_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode 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,
	enum fe_sec_mini_cmd minicmd)
	{
	return flexcop_send_diseqc_msg(fe, 0, NULL, minicmd);
	}

	static struct mt312_config skystar23_samsung_tbdu18132_config = {
	.demod_address = 0x0e,
	};

	static int skystar2_rev23_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	struct dvb_frontend_ops *ops;

	fc->fe = dvb_attach(mt312_attach, &skystar23_samsung_tbdu18132_config, i2c);
	if (!fc->fe)
	return 0;

	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61, i2c,
	DVB_PLL_SAMSUNG_TBDU18132))
	return 0;

	ops = &fc->fe->ops;
	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;
	return 1;
	}
	#else
	#define skystar2_rev23_attach NULL
	#endif

	/* SkyStar2 DVB-S rev 2.6 */
	#if FE_SUPPORTED(STV0299) && FE_SUPPORTED(PLL)
	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 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,
	};

	static int skystar2_rev26_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(stv0299_attach, &samsung_tbmu24112_config, i2c);
	if (!fc->fe)
	return 0;

	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61, i2c,
	DVB_PLL_SAMSUNG_TBMU24112))
	return 0;

	fc->fe->ops.set_voltage = flexcop_set_voltage;
	fc->fe_sleep = fc->fe->ops.sleep;
	fc->fe->ops.sleep = flexcop_sleep;
	return 1;

	}
	#else
	#define skystar2_rev26_attach NULL
	#endif

	/* SkyStar2 DVB-S rev 2.7 */
	#if FE_SUPPORTED(S5H1420) && FE_SUPPORTED(ISL6421) && FE_SUPPORTED(TUNER_ITD1000)
	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,
	};

	static int skystar2_rev27_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	flexcop_ibi_value r108;
	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)
	goto fail;

	i2c_tuner = s5h1420_get_tuner_i2c_adapter(fc->fe);
	if (!i2c_tuner)
	goto fail;

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

	/* 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, false)) {
	err("ISL6421 could NOT be attached");
	goto fail_isl;
	}
	info("ISL6421 successfully attached");

	/* the ITD1000 requires a lower i2c clock - is it a problem ? */
	r108.raw = 0x00000506;
	fc->write_ibi_reg(fc, tw_sm_c_108, r108);
	if (!dvb_attach(itd1000_attach, fc->fe, i2c_tuner,
	&skystar2_rev2_7_itd1000_config)) {
	err("ITD1000 could NOT be attached");
	/* Should i2c clock be restored? */
	goto fail_isl;
	}
	info("ITD1000 successfully attached");

	return 1;

	fail_isl:
	fc->fc_i2c_adap[2].no_base_addr = 0;
	fail:
	/* for the next devices we need it again */
	fc->fc_i2c_adap[0].no_base_addr = 0;
	return 0;
	}
	#else
	#define skystar2_rev27_attach NULL
	#endif

	/* SkyStar2 rev 2.8 */
	#if FE_SUPPORTED(CX24123) && FE_SUPPORTED(ISL6421) && FE_SUPPORTED(TUNER_CX24113)
	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,
	};

	static int skystar2_rev28_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	struct i2c_adapter *i2c_tuner;

	fc->fe = dvb_attach(cx24123_attach, &skystar2_rev2_8_cx24123_config,
	i2c);
	if (!fc->fe)
	return 0;

	i2c_tuner = cx24123_get_tuner_i2c_adapter(fc->fe);
	if (!i2c_tuner)
	return 0;

	if (!dvb_attach(cx24113_attach, fc->fe, &skystar2_rev2_8_cx24113_config,
	i2c_tuner)) {
	err("CX24113 could NOT be attached");
	return 0;
	}
	info("CX24113 successfully attached");

	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, false)) {
	err("ISL6421 could NOT be attached");
	fc->fc_i2c_adap[2].no_base_addr = 0;
	return 0;
	}
	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 ??? */
	return 1;
	}
	#else
	#define skystar2_rev28_attach NULL
	#endif

	/* AirStar DVB-T */
	#if FE_SUPPORTED(MT352) && FE_SUPPORTED(PLL)
	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 struct mt352_config samsung_tdtc9251dh0_config = {
	.demod_address = 0x0f,
	.demod_init = samsung_tdtc9251dh0_demod_init,
	};

	static int airstar_dvbt_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(mt352_attach, &samsung_tdtc9251dh0_config, i2c);
	if (!fc->fe)
	return 0;

	return !!dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL,
	DVB_PLL_SAMSUNG_TDTC9251DH0);
	}
	#else
	#define airstar_dvbt_attach NULL
	#endif

	/* AirStar ATSC 1st generation */
	#if FE_SUPPORTED(BCM3510)
	static struct bcm3510_config air2pc_atsc_first_gen_config = {
	.demod_address = 0x0f,
	.request_firmware = flexcop_fe_request_firmware,
	};

	static int airstar_atsc1_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(bcm3510_attach, &air2pc_atsc_first_gen_config, i2c);
	return fc->fe != NULL;
	}
	#else
	#define airstar_atsc1_attach NULL
	#endif

	/* AirStar ATSC 2nd generation */
	#if FE_SUPPORTED(NXT200X) && FE_SUPPORTED(PLL)
	static const struct nxt200x_config samsung_tbmv_config = {
	.demod_address = 0x0a,
	};

	static int airstar_atsc2_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(nxt200x_attach, &samsung_tbmv_config, i2c);
	if (!fc->fe)
	return 0;

	return !!dvb_attach(dvb_pll_attach, fc->fe, 0x61, NULL,
	DVB_PLL_SAMSUNG_TBMV);
	}
	#else
	#define airstar_atsc2_attach NULL
	#endif

	/* AirStar ATSC 3rd generation */
	#if FE_SUPPORTED(LGDT330X)
	static struct lgdt330x_config air2pc_atsc_hd5000_config = {
	.demod_address = 0x59,
	.demod_chip = LGDT3303,
	.serial_mpeg = 0x04,
	.clock_polarity_flip = 1,
	};

	static int airstar_atsc3_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(lgdt330x_attach, &air2pc_atsc_hd5000_config, i2c);
	if (!fc->fe)
	return 0;

	return !!dvb_attach(simple_tuner_attach, fc->fe, i2c, 0x61,
	TUNER_LG_TDVS_H06XF);
	}
	#else
	#define airstar_atsc3_attach NULL
	#endif

	/* CableStar2 DVB-C */
	#if FE_SUPPORTED(STV0297) && FE_SUPPORTED(PLL)
	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,
	};

	static int cablestar2_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fc_i2c_adap[0].no_base_addr = 1;
	fc->fe = dvb_attach(stv0297_attach, &alps_tdee4_stv0297_config, i2c);
	if (!fc->fe)
	goto fail;

	/* This tuner doesn't use the stv0297's I2C gate, but instead the
	* tuner is connected to a different flexcop I2C adapter. */
	if (fc->fe->ops.i2c_gate_ctrl)
	fc->fe->ops.i2c_gate_ctrl(fc->fe, 0);
	fc->fe->ops.i2c_gate_ctrl = NULL;

	if (!dvb_attach(dvb_pll_attach, fc->fe, 0x61,
	&fc->fc_i2c_adap[2].i2c_adap, DVB_PLL_TDEE4))
	goto fail;

	return 1;

	fail:
	/* Reset for next frontend to try */
	fc->fc_i2c_adap[0].no_base_addr = 0;
	return 0;
	}
	#else
	#define cablestar2_attach NULL
	#endif

	/* SkyStar S2 PCI DVB-S/S2 card based on Conexant cx24120/cx24118 */
	#if FE_SUPPORTED(CX24120) && FE_SUPPORTED(ISL6421)
	static const struct cx24120_config skystar2_rev3_3_cx24120_config = {
	.i2c_addr = 0x55,
	.xtal_khz = 10111,
	.initial_mpeg_config = { 0xa1, 0x76, 0x07 },
	.request_firmware = flexcop_fe_request_firmware,
	.i2c_wr_max = 4,
	};

	static int skystarS2_rev33_attach(struct flexcop_device *fc,
	struct i2c_adapter *i2c)
	{
	fc->fe = dvb_attach(cx24120_attach,
	&skystar2_rev3_3_cx24120_config, i2c);
	if (!fc->fe)
	return 0;

	fc->dev_type = FC_SKYS2_REV33;
	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, false)) {
	err("ISL6421 could NOT be attached!");
	fc->fc_i2c_adap[2].no_base_addr = 0;
	return 0;
	}
	info("ISL6421 successfully attached.");

	if (fc->has_32_hw_pid_filter)
	fc->skip_6_hw_pid_filter = 1;

	return 1;
	}
	#else
	#define skystarS2_rev33_attach NULL
	#endif

	static struct {
	flexcop_device_type_t type;
	int (attach)(struct flexcop_device , struct i2c_adapter *);
	} flexcop_frontends[] = {
	{ FC_SKY_REV27, skystar2_rev27_attach },
	{ FC_SKY_REV28, skystar2_rev28_attach },
	{ FC_SKY_REV26, skystar2_rev26_attach },
	{ FC_AIR_DVBT, airstar_dvbt_attach },
	{ FC_AIR_ATSC2, airstar_atsc2_attach },
	{ FC_AIR_ATSC3, airstar_atsc3_attach },
	{ FC_AIR_ATSC1, airstar_atsc1_attach },
	{ FC_CABLE, cablestar2_attach },
	{ FC_SKY_REV23, skystar2_rev23_attach },
	{ FC_SKYS2_REV33, skystarS2_rev33_attach },
	};

	/* try to figure out the frontend */
	int flexcop_frontend_init(struct flexcop_device *fc)
	{
	int i;
	for (i = 0; i < ARRAY_SIZE(flexcop_frontends); i++) {
	if (!flexcop_frontends[i].attach)
	continue;
	/* type needs to be set before, because of some workarounds
	* done based on the probed card type */
	fc->dev_type = flexcop_frontends[i].type;
	if (flexcop_frontends[i].attach(fc, &fc->fc_i2c_adap[0].i2c_adap))
	goto fe_found;
	/* Clean up partially attached frontend */
	if (fc->fe) {
	dvb_frontend_detach(fc->fe);
	fc->fe = NULL;
	}
	}
	fc->dev_type = FC_UNK;
	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!");
	dvb_frontend_detach(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;
	}