// 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_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,
                            0x59, 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;
}