// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Silicon Labs Si2168 DVB-T/T2/C demodulator driver
 *
 * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
 */

#include <linux/delay.h>

#include "si2168_priv.h"

static const struct dvb_frontend_ops si2168_ops;

static void cmd_init(struct si2168_cmd *cmd, const u8 *buf, int wlen, int rlen)
{
        memcpy(cmd->args, buf, wlen);
        cmd->wlen = wlen;
        cmd->rlen = rlen;
}

/* execute firmware command */
static int si2168_cmd_execute(struct i2c_client *client, struct si2168_cmd *cmd)
{
        struct si2168_dev *dev = i2c_get_clientdata(client);
        int ret;
        unsigned long timeout;

        mutex_lock(&dev->i2c_mutex);

        if (cmd->wlen) {
                /* write cmd and args for firmware */
                ret = i2c_master_send(client, cmd->args, cmd->wlen);
                if (ret < 0) {
                        goto err_mutex_unlock;
                } else if (ret != cmd->wlen) {
                        ret = -EREMOTEIO;
                        goto err_mutex_unlock;
                }
        }

        if (cmd->rlen) {
                /* wait cmd execution terminate */
                #define TIMEOUT 70
                timeout = jiffies + msecs_to_jiffies(TIMEOUT);
                while (!time_after(jiffies, timeout)) {
                        ret = i2c_master_recv(client, cmd->args, cmd->rlen);
                        if (ret < 0) {
                                goto err_mutex_unlock;
                        } else if (ret != cmd->rlen) {
                                ret = -EREMOTEIO;
                                goto err_mutex_unlock;
                        }

                        /* firmware ready? */
                        if ((cmd->args[0] >> 7) & 0x01)
                                break;
                }

                dev_dbg(&client->dev, "cmd execution took %d ms\n",
                                jiffies_to_msecs(jiffies) -
                                (jiffies_to_msecs(timeout) - TIMEOUT));

                /* error bit set? */
                if ((cmd->args[0] >> 6) & 0x01) {
                        ret = -EREMOTEIO;
                        goto err_mutex_unlock;
                }

                if (!((cmd->args[0] >> 7) & 0x01)) {
                        ret = -ETIMEDOUT;
                        goto err_mutex_unlock;
                }
        }

        mutex_unlock(&dev->i2c_mutex);
        return 0;
err_mutex_unlock:
        mutex_unlock(&dev->i2c_mutex);
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);
        struct si2168_cmd cmd;
        int ret = 0;

        dev_dbg(&client->dev, "%s acquire: %d\n", __func__, acquire);

        /* set manual value */
        if (dev->ts_mode & SI2168_TS_CLK_MANUAL) {
                cmd_init(&cmd, "\x14\x00\x0d\x10\xe8\x03", 6, 4);
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        return ret;
        }
        /* set TS_MODE property */
        cmd_init(&cmd, "\x14\x00\x01\x10\x10\x00", 6, 4);
        if (dev->ts_mode & SI2168_TS_CLK_MANUAL)
                cmd.args[4] = SI2168_TS_CLK_MANUAL;
        if (acquire)
                cmd.args[4] |= dev->ts_mode;
        else
                cmd.args[4] |= SI2168_TS_TRISTATE;
        if (dev->ts_clock_gapped)
                cmd.args[4] |= 0x40;
        ret = si2168_cmd_execute(client, &cmd);

        return ret;
}

static int si2168_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret, i;
        unsigned int utmp, utmp1, utmp2;
        struct si2168_cmd cmd;

        *status = 0;

        if (!dev->active) {
                ret = -EAGAIN;
                goto err;
        }

        switch (c->delivery_system) {
        case SYS_DVBT:
                cmd_init(&cmd, "\xa0\x01", 2, 13);
                break;
        case SYS_DVBC_ANNEX_A:
                cmd_init(&cmd, "\x90\x01", 2, 9);
                break;
        case SYS_DVBT2:
                cmd_init(&cmd, "\x50\x01", 2, 14);
                break;
        default:
                ret = -EINVAL;
                goto err;
        }

        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        switch ((cmd.args[2] >> 1) & 0x03) {
        case 0x01:
                *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
                break;
        case 0x03:
                *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
                                FE_HAS_SYNC | FE_HAS_LOCK;
                break;
        }

        dev->fe_status = *status;

        if (*status & FE_HAS_LOCK) {
                c->cnr.len = 1;
                c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
                c->cnr.stat[0].svalue = cmd.args[3] * 1000 / 4;
        } else {
                c->cnr.len = 1;
                c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }

        dev_dbg(&client->dev, "status=%02x args=%*ph\n",
                        *status, cmd.rlen, cmd.args);

        /* BER */
        if (*status & FE_HAS_VITERBI) {
                cmd_init(&cmd, "\x82\x00", 2, 3);
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;

                /*
                 * Firmware returns [0, 255] mantissa and [0, 8] exponent.
                 * Convert to DVB API: mantissa * 10^(8 - exponent) / 10^8
                 */
                utmp = clamp(8 - cmd.args[1], 0, 8);
                for (i = 0, utmp1 = 1; i < utmp; i++)
                        utmp1 = utmp1 * 10;

                utmp1 = cmd.args[2] * utmp1;
                utmp2 = 100000000; /* 10^8 */

                dev_dbg(&client->dev,
                        "post_bit_error=%u post_bit_count=%u ber=%u*10^-%u\n",
                        utmp1, utmp2, cmd.args[2], cmd.args[1]);

                c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
                c->post_bit_error.stat[0].uvalue += utmp1;
                c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
                c->post_bit_count.stat[0].uvalue += utmp2;
        } else {
                c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }

        /* UCB */
        if (*status & FE_HAS_SYNC) {
                cmd_init(&cmd, "\x84\x01", 2, 3);
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;

                utmp1 = cmd.args[2] << 8 | cmd.args[1] << 0;
                dev_dbg(&client->dev, "block_error=%u\n", utmp1);

                /* Sometimes firmware returns bogus value */
                if (utmp1 == 0xffff)
                        utmp1 = 0;

                c->block_error.stat[0].scale = FE_SCALE_COUNTER;
                c->block_error.stat[0].uvalue += utmp1;
        } else {
                c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }

        return 0;
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_set_frontend(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret;
        struct si2168_cmd cmd;
        u8 bandwidth, delivery_system;

        dev_dbg(&client->dev,
                        "delivery_system=%u modulation=%u frequency=%u bandwidth_hz=%u symbol_rate=%u inversion=%u stream_id=%u\n",
                        c->delivery_system, c->modulation, c->frequency,
                        c->bandwidth_hz, c->symbol_rate, c->inversion,
                        c->stream_id);

        if (!dev->active) {
                ret = -EAGAIN;
                goto err;
        }

        switch (c->delivery_system) {
        case SYS_DVBT:
                delivery_system = 0x20;
                break;
        case SYS_DVBC_ANNEX_A:
                delivery_system = 0x30;
                break;
        case SYS_DVBT2:
                delivery_system = 0x70;
                break;
        default:
                ret = -EINVAL;
                goto err;
        }

        if (c->bandwidth_hz == 0) {
                ret = -EINVAL;
                goto err;
        } else if (c->bandwidth_hz <= 2000000)
                bandwidth = 0x02;
        else if (c->bandwidth_hz <= 5000000)
                bandwidth = 0x05;
        else if (c->bandwidth_hz <= 6000000)
                bandwidth = 0x06;
        else if (c->bandwidth_hz <= 7000000)
                bandwidth = 0x07;
        else if (c->bandwidth_hz <= 8000000)
                bandwidth = 0x08;
        else if (c->bandwidth_hz <= 9000000)
                bandwidth = 0x09;
        else if (c->bandwidth_hz <= 10000000)
                bandwidth = 0x0a;
        else
                bandwidth = 0x0f;

        /* program tuner */
        if (fe->ops.tuner_ops.set_params) {
                ret = fe->ops.tuner_ops.set_params(fe);
                if (ret)
                        goto err;
        }

        cmd_init(&cmd, "\x88\x02\x02\x02\x02", 5, 5);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* that has no big effect */
        if (c->delivery_system == SYS_DVBT)
                cmd_init(&cmd, "\x89\x21\x06\x11\xff\x98", 6, 3);
        else if (c->delivery_system == SYS_DVBC_ANNEX_A)
                cmd_init(&cmd, "\x89\x21\x06\x11\x89\xf0", 6, 3);
        else if (c->delivery_system == SYS_DVBT2)
                cmd_init(&cmd, "\x89\x21\x06\x11\x89\x20", 6, 3);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        if (c->delivery_system == SYS_DVBT2) {
                /* select PLP */
                cmd.args[0] = 0x52;
                cmd.args[1] = c->stream_id & 0xff;
                cmd.args[2] = c->stream_id == NO_STREAM_ID_FILTER ? 0 : 1;
                cmd.wlen = 3;
                cmd.rlen = 1;
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;
        }

        cmd_init(&cmd, "\x51\x03", 2, 12);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x12\x08\x04", 3, 3);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x0c\x10\x12\x00", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x06\x10\x24\x00", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x07\x10\x00\x24", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x0a\x10\x00\x00", 6, 4);
        cmd.args[4] = delivery_system | bandwidth;
        if (dev->spectral_inversion)
                cmd.args[5] |= 1;
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set DVB-C symbol rate */
        if (c->delivery_system == SYS_DVBC_ANNEX_A) {
                cmd_init(&cmd, "\x14\x00\x02\x11\x00\x00", 6, 4);
                cmd.args[4] = ((c->symbol_rate / 1000) >> 0) & 0xff;
                cmd.args[5] = ((c->symbol_rate / 1000) >> 8) & 0xff;
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;
        }

        cmd_init(&cmd, "\x14\x00\x0f\x10\x10\x00", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x09\x10\xe3\x08", 6, 4);
        cmd.args[5] |= dev->ts_clock_inv ? 0x00 : 0x10;
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x08\x10\xd7\x05", 6, 4);
        cmd.args[5] |= dev->ts_clock_inv ? 0x00 : 0x10;
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x01\x12\x00\x00", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x14\x00\x01\x03\x0c\x00", 6, 4);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        cmd_init(&cmd, "\x85", 1, 1);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        dev->delivery_system = c->delivery_system;

        /* enable ts bus */
        ret = si2168_ts_bus_ctrl(fe, 1);
        if (ret)
                goto err;

        return 0;
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_init(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret, len, remaining;
        const struct firmware *fw;
        struct si2168_cmd cmd;

        dev_dbg(&client->dev, "\n");

        /* initialize */
        cmd_init(&cmd, "\xc0\x12\x00\x0c\x00\x0d\x16\x00\x00\x00\x00\x00\x00",
                 13, 0);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        if (dev->warm) {
                /* resume */
                cmd_init(&cmd, "\xc0\x06\x08\x0f\x00\x20\x21\x01", 8, 1);
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;

                udelay(100);
                cmd_init(&cmd, "\x85", 1, 1);
                ret = si2168_cmd_execute(client, &cmd);
                if (ret)
                        goto err;

                goto warm;
        }

        /* power up */
        cmd_init(&cmd, "\xc0\x06\x01\x0f\x00\x20\x20\x01", 8, 1);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* request the firmware, this will block and timeout */
        ret = request_firmware(&fw, dev->firmware_name, &client->dev);
        if (ret) {
                dev_err(&client->dev,
                        "firmware file '%s' not found\n",
                        dev->firmware_name);
                goto err_release_firmware;
        }

        dev_info(&client->dev, "downloading firmware from file '%s'\n",
                        dev->firmware_name);

        if ((fw->size % 17 == 0) && (fw->data[0] > 5)) {
                /* firmware is in the new format */
                for (remaining = fw->size; remaining > 0; remaining -= 17) {
                        len = fw->data[fw->size - remaining];
                        if (len > SI2168_ARGLEN) {
                                ret = -EINVAL;
                                break;
                        }
                        cmd_init(&cmd, &fw->data[(fw->size - remaining) + 1],
                                 len, 1);
                        ret = si2168_cmd_execute(client, &cmd);
                        if (ret)
                                break;
                }
        } else if (fw->size % 8 == 0) {
                /* firmware is in the old format */
                for (remaining = fw->size; remaining > 0; remaining -= 8) {
                        cmd_init(&cmd, &fw->data[fw->size - remaining], 8, 1);
                        ret = si2168_cmd_execute(client, &cmd);
                        if (ret)
                                break;
                }
        } else {
                /* bad or unknown firmware format */
                ret = -EINVAL;
        }

        if (ret) {
                dev_err(&client->dev, "firmware download failed %d\n", ret);
                goto err_release_firmware;
        }

        release_firmware(fw);

        cmd_init(&cmd, "\x01\x01", 2, 1);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* query firmware version */
        cmd_init(&cmd, "\x11", 1, 10);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        dev->version = (cmd.args[9] + '@') << 24 | (cmd.args[6] - '0') << 16 |
                       (cmd.args[7] - '0') << 8 | (cmd.args[8]) << 0;
        dev_info(&client->dev, "firmware version: %c %d.%d.%d\n",
                 dev->version >> 24 & 0xff, dev->version >> 16 & 0xff,
                 dev->version >> 8 & 0xff, dev->version >> 0 & 0xff);

        /* set ts mode */
        ret = si2168_ts_bus_ctrl(fe, 1);
        if (ret)
                goto err;

        dev->warm = true;
        dev->initialized = true;
warm:
        /* Init stats here to indicate which stats are supported */
        c->cnr.len = 1;
        c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->post_bit_error.len = 1;
        c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->post_bit_count.len = 1;
        c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->block_error.len = 1;
        c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

        dev->active = true;

        return 0;
err_release_firmware:
        release_firmware(fw);
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_resume(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);

        /*
         * check whether si2168_init() has been called successfully
         * outside of a resume cycle. Only call it (and load firmware)
         * in this case. si2168_init() is only called during resume
         * once the device has actually been used. Otherwise, leave the
         * device untouched.
         */
        if (dev->initialized) {
                dev_dbg(&client->dev, "previously initialized, call si2168_init()\n");
                return si2168_init(fe);
        }
        dev_dbg(&client->dev, "not initialized yet, skipping init on resume\n");
        return 0;
}

static int si2168_sleep(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->demodulator_priv;
        struct si2168_dev *dev = i2c_get_clientdata(client);
        int ret;
        struct si2168_cmd cmd;

        dev_dbg(&client->dev, "\n");

        dev->active = false;

        /* tri-state data bus */
        ret = si2168_ts_bus_ctrl(fe, 0);
        if (ret)
                goto err;

        /* Firmware later than B 4.0-11 loses warm state during sleep */
        if (dev->version > ('B' << 24 | 4 << 16 | 0 << 8 | 11 << 0))
                dev->warm = false;

        cmd_init(&cmd, "\x13", 1, 0);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        return 0;
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_get_tune_settings(struct dvb_frontend *fe,
        struct dvb_frontend_tune_settings *s)
{
        s->min_delay_ms = 900;

        return 0;
}

static int si2168_select(struct i2c_mux_core *muxc, u32 chan)
{
        struct i2c_client *client = i2c_mux_priv(muxc);
        int ret;
        struct si2168_cmd cmd;

        /* open I2C gate */
        cmd_init(&cmd, "\xc0\x0d\x01", 3, 0);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        return 0;
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static int si2168_deselect(struct i2c_mux_core *muxc, u32 chan)
{
        struct i2c_client *client = i2c_mux_priv(muxc);
        int ret;
        struct si2168_cmd cmd;

        /* close I2C gate */
        cmd_init(&cmd, "\xc0\x0d\x00", 3, 0);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        return 0;
err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
        return ret;
}

static const struct dvb_frontend_ops si2168_ops = {
        .delsys = {SYS_DVBT, SYS_DVBT2, SYS_DVBC_ANNEX_A},
        .info = {
                .name = "Silicon Labs Si2168",
                .frequency_min_hz      =  48 * MHz,
                .frequency_max_hz      = 870 * MHz,
                .frequency_stepsize_hz = 62500,
                .symbol_rate_min       = 1000000,
                .symbol_rate_max       = 7200000,
                .caps = FE_CAN_FEC_1_2 |
                        FE_CAN_FEC_2_3 |
                        FE_CAN_FEC_3_4 |
                        FE_CAN_FEC_5_6 |
                        FE_CAN_FEC_7_8 |
                        FE_CAN_FEC_AUTO |
                        FE_CAN_QPSK |
                        FE_CAN_QAM_16 |
                        FE_CAN_QAM_32 |
                        FE_CAN_QAM_64 |
                        FE_CAN_QAM_128 |
                        FE_CAN_QAM_256 |
                        FE_CAN_QAM_AUTO |
                        FE_CAN_TRANSMISSION_MODE_AUTO |
                        FE_CAN_GUARD_INTERVAL_AUTO |
                        FE_CAN_HIERARCHY_AUTO |
                        FE_CAN_MUTE_TS |
                        FE_CAN_2G_MODULATION |
                        FE_CAN_MULTISTREAM
        },

        .get_tune_settings = si2168_get_tune_settings,

        .init = si2168_init,
        .sleep = si2168_sleep,
        .resume = si2168_resume,

        .set_frontend = si2168_set_frontend,

        .read_status = si2168_read_status,
};

static int si2168_probe(struct i2c_client *client)
{
        struct si2168_config *config = client->dev.platform_data;
        struct si2168_dev *dev;
        int ret;
        struct si2168_cmd cmd;

        dev_dbg(&client->dev, "\n");

        dev = kzalloc_obj(*dev);
        if (!dev) {
                ret = -ENOMEM;
                goto err;
        }

        i2c_set_clientdata(client, dev);
        mutex_init(&dev->i2c_mutex);

        /* Initialize */
        cmd_init(&cmd, "\xc0\x12\x00\x0c\x00\x0d\x16\x00\x00\x00\x00\x00\x00",
                 13, 0);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err_kfree;

        /* Power up */
        cmd_init(&cmd, "\xc0\x06\x01\x0f\x00\x20\x20\x01", 8, 1);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err_kfree;

        /* Query chip revision */
        cmd_init(&cmd, "\x02", 1, 13);
        ret = si2168_cmd_execute(client, &cmd);
        if (ret)
                goto err_kfree;

        dev->chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 |
                       cmd.args[3] << 8 | cmd.args[4] << 0;

        switch (dev->chip_id) {
        case SI2168_CHIP_ID_A20:
                dev->firmware_name = SI2168_A20_FIRMWARE;
                break;
        case SI2168_CHIP_ID_A30:
                dev->firmware_name = SI2168_A30_FIRMWARE;
                break;
        case SI2168_CHIP_ID_B40:
                dev->firmware_name = SI2168_B40_FIRMWARE;
                break;
        case SI2168_CHIP_ID_D60:
                dev->firmware_name = SI2168_D60_FIRMWARE;
                break;
        default:
                dev_dbg(&client->dev, "unknown chip version Si21%d-%c%c%c\n",
                        cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);
                ret = -ENODEV;
                goto err_kfree;
        }

        dev->version = (cmd.args[1]) << 24 | (cmd.args[3] - '0') << 16 |
                       (cmd.args[4] - '0') << 8 | (cmd.args[5]) << 0;

        /* create mux i2c adapter for tuner */
        dev->muxc = i2c_mux_alloc(client->adapter, &client->dev,
                                  1, 0, I2C_MUX_LOCKED,
                                  si2168_select, si2168_deselect);
        if (!dev->muxc) {
                ret = -ENOMEM;
                goto err_kfree;
        }
        dev->muxc->priv = client;
        ret = i2c_mux_add_adapter(dev->muxc, 0, 0);
        if (ret)
                goto err_kfree;

        /* create dvb_frontend */
        memcpy(&dev->fe.ops, &si2168_ops, sizeof(struct dvb_frontend_ops));
        dev->fe.demodulator_priv = client;
        *config->i2c_adapter = dev->muxc->adapter[0];
        *config->fe = &dev->fe;
        dev->ts_mode = config->ts_mode;
        dev->ts_clock_inv = config->ts_clock_inv;
        dev->ts_clock_gapped = config->ts_clock_gapped;
        dev->spectral_inversion = config->spectral_inversion;

        dev_info(&client->dev, "Silicon Labs Si2168-%c%d%d successfully identified\n",
                 dev->version >> 24 & 0xff, dev->version >> 16 & 0xff,
                 dev->version >> 8 & 0xff);
        dev_info(&client->dev, "firmware version: %c %d.%d.%d\n",
                 dev->version >> 24 & 0xff, dev->version >> 16 & 0xff,
                 dev->version >> 8 & 0xff, dev->version >> 0 & 0xff);

        return 0;
err_kfree:
        kfree(dev);
err:
        dev_warn(&client->dev, "probe failed = %d\n", ret);
        return ret;
}

static void si2168_remove(struct i2c_client *client)
{
        struct si2168_dev *dev = i2c_get_clientdata(client);

        dev_dbg(&client->dev, "\n");

        i2c_mux_del_adapters(dev->muxc);

        dev->fe.ops.release = NULL;
        dev->fe.demodulator_priv = NULL;

        kfree(dev);
}

static const struct i2c_device_id si2168_id_table[] = {
        { "si2168" },
        {}
};
MODULE_DEVICE_TABLE(i2c, si2168_id_table);

static struct i2c_driver si2168_driver = {
        .driver = {
                .name                = "si2168",
                .suppress_bind_attrs = true,
        },
        .probe          = si2168_probe,
        .remove         = si2168_remove,
        .id_table       = si2168_id_table,
};

module_i2c_driver(si2168_driver);

MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Silicon Labs Si2168 DVB-T/T2/C demodulator driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE(SI2168_A20_FIRMWARE);
MODULE_FIRMWARE(SI2168_A30_FIRMWARE);
MODULE_FIRMWARE(SI2168_B40_FIRMWARE);
MODULE_FIRMWARE(SI2168_D60_FIRMWARE);