android_kernel_xiaomi_sm8350/drivers/media/dvb/b2c2/flexcop-fe-tuner.c

/*
 * 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);
			udelay(12500);
			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,
};

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;
		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_DVB;
		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->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;
	}

	/* 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_OLD;
		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;
}