// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Silicon Labs Si2146/2147/2148/2157/2158 silicon tuner driver
 *
 * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
 */

#include "si2157_priv.h"

static const struct dvb_tuner_ops si2157_ops;

static int tuner_lock_debug;
module_param(tuner_lock_debug, int, 0644);
MODULE_PARM_DESC(tuner_lock_debug, "if set, signal lock is briefly waited on after setting params");

/* execute firmware command */
static int si2157_cmd_execute(struct i2c_client *client, struct si2157_cmd *cmd)
{
        struct si2157_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 80
                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, status=%x\n",
                        jiffies_to_msecs(jiffies) -
                        (jiffies_to_msecs(timeout) - TIMEOUT),
                        cmd->args[0]);

                if (!((cmd->args[0] >> 7) & 0x01)) {
                        ret = -ETIMEDOUT;
                        goto err_mutex_unlock;
                }
                /* check error status bit */
                if (cmd->args[0] & 0x40) {
                        ret = -EAGAIN;
                        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 const struct si2157_tuner_info si2157_tuners[] = {
        { SI2141, 0x60, false, SI2141_60_FIRMWARE, SI2141_A10_FIRMWARE },
        { SI2141, 0x61, false, SI2141_61_FIRMWARE, SI2141_A10_FIRMWARE },
        { SI2146, 0x11, false, SI2146_11_FIRMWARE, NULL },
        { SI2147, 0x50, false, SI2147_50_FIRMWARE, NULL },
        { SI2148, 0x32, true,  SI2148_32_FIRMWARE, SI2158_A20_FIRMWARE },
        { SI2148, 0x33, true,  SI2148_33_FIRMWARE, SI2158_A20_FIRMWARE },
        { SI2157, 0x50, false, SI2157_50_FIRMWARE, SI2157_A30_FIRMWARE },
        { SI2158, 0x50, false, SI2158_50_FIRMWARE, SI2158_A20_FIRMWARE },
        { SI2158, 0x51, false, SI2158_51_FIRMWARE, SI2158_A20_FIRMWARE },
        { SI2177, 0x50, false, SI2177_50_FIRMWARE, SI2157_A30_FIRMWARE },
};

static int si2157_load_firmware(struct dvb_frontend *fe,
                                const char *fw_name)
{
        struct i2c_client *client = fe->tuner_priv;
        const struct firmware *fw;
        int ret, len, remaining;
        struct si2157_cmd cmd;

        /* request the firmware, this will block and timeout */
        ret = firmware_request_nowarn(&fw, fw_name, &client->dev);
        if (ret)
                return ret;

        /* firmware should be n chunks of 17 bytes */
        if (fw->size % 17 != 0) {
                dev_err(&client->dev, "firmware file '%s' is invalid\n",
                        fw_name);
                ret = -EINVAL;
                goto err_release_firmware;
        }

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

        for (remaining = fw->size; remaining > 0; remaining -= 17) {
                len = fw->data[fw->size - remaining];
                if (len > SI2157_ARGLEN) {
                        dev_err(&client->dev, "Bad firmware length\n");
                        ret = -EINVAL;
                        goto err_release_firmware;
                }
                memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len);
                cmd.wlen = len;
                cmd.rlen = 1;
                ret = si2157_cmd_execute(client, &cmd);
                if (ret) {
                        dev_err(&client->dev, "firmware download failed %d\n",
                                        ret);
                        goto err_release_firmware;
                }
        }

err_release_firmware:
        release_firmware(fw);

        return ret;
}

static int si2157_find_and_load_firmware(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
        const char *fw_alt_name = NULL;
        unsigned char part_id, rom_id;
        const char *fw_name = NULL;
        struct si2157_cmd cmd;
        bool required = true;
        int ret, i;

        if (dev->dont_load_firmware) {
                dev_info(&client->dev,
                         "device is buggy, skipping firmware download\n");
                return 0;
        }

        /* query chip revision */
        memcpy(cmd.args, "\x02", 1);
        cmd.wlen = 1;
        cmd.rlen = 13;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                return ret;

        part_id = cmd.args[2];
        rom_id = cmd.args[12];

        for (i = 0; i < ARRAY_SIZE(si2157_tuners); i++) {
                if (si2157_tuners[i].part_id != part_id)
                        continue;
                required = si2157_tuners[i].required;
                fw_alt_name = si2157_tuners[i].fw_alt_name;

                /* Both part and rom ID match */
                if (si2157_tuners[i].rom_id == rom_id) {
                        fw_name = si2157_tuners[i].fw_name;
                        break;
                }
        }

        if (required && !fw_name && !fw_alt_name) {
                dev_err(&client->dev,
                        "unknown chip version Si21%d-%c%c%c ROM 0x%02x\n",
                        part_id, cmd.args[1], cmd.args[3], cmd.args[4], rom_id);
                return -EINVAL;
        }

        /* Update the part id based on device's report */
        dev->part_id = part_id;

        dev_info(&client->dev,
                 "found a 'Silicon Labs Si21%d-%c%c%c ROM 0x%02x'\n",
                 part_id, cmd.args[1], cmd.args[3], cmd.args[4], rom_id);

        if (fw_name)
                ret = si2157_load_firmware(fe, fw_name);
        else
                ret = -ENOENT;

        /* Try alternate name, if any */
        if (ret == -ENOENT && fw_alt_name)
                ret = si2157_load_firmware(fe, fw_alt_name);

        if (ret == -ENOENT) {
                if (!required) {
                        dev_info(&client->dev, "Using ROM firmware.\n");
                        return 0;
                }
                dev_err(&client->dev, "Can't continue without a firmware.\n");
        } else if (ret < 0) {
                dev_err(&client->dev, "error %d when loading firmware\n", ret);
        }
        return ret;
}

static int si2157_init(struct dvb_frontend *fe)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
        unsigned int xtal_trim;
        struct si2157_cmd cmd;
        int ret;

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

        /* Try to get Xtal trim property, to verify tuner still running */
        memcpy(cmd.args, "\x15\x00\x02\x04", 4);
        cmd.wlen = 4;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);

        xtal_trim = cmd.args[2] | (cmd.args[3] << 8);

        if (ret == 0 && xtal_trim < 16)
                goto warm;

        dev->if_frequency = 0; /* we no longer know current tuner state */

        /* power up */
        if (dev->part_id == SI2146) {
                /* clock_mode = XTAL, clock_freq = 24MHz */
                memcpy(cmd.args, "\xc0\x05\x01\x00\x00\x0b\x00\x00\x01", 9);
                cmd.wlen = 9;
        } else if (dev->part_id == SI2141) {
                /* clock_mode: XTAL, xout enabled */
                memcpy(cmd.args, "\xc0\x00\x0d\x0e\x00\x01\x01\x01\x01\x03", 10);
                cmd.wlen = 10;
        } else {
                memcpy(cmd.args, "\xc0\x00\x0c\x00\x00\x01\x01\x01\x01\x01\x01\x02\x00\x00\x01", 15);
                cmd.wlen = 15;
        }
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret && (dev->part_id != SI2141 || ret != -EAGAIN))
                goto err;

        /* Si2141 needs a wake up command */
        if (dev->part_id == SI2141) {
                memcpy(cmd.args, "\xc0\x08\x01\x02\x00\x00\x01", 7);
                cmd.wlen = 7;
                ret = si2157_cmd_execute(client, &cmd);
                if (ret)
                        goto err;
        }

        /* Try to load the firmware */
        ret = si2157_find_and_load_firmware(fe);
        if (ret < 0)
                goto err;

        /* reboot the tuner with new firmware? */
        memcpy(cmd.args, "\x01\x01", 2);
        cmd.wlen = 2;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* query firmware version */
        memcpy(cmd.args, "\x11", 1);
        cmd.wlen = 1;
        cmd.rlen = 10;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        dev_info(&client->dev, "firmware version: %c.%c.%d\n",
                        cmd.args[6], cmd.args[7], cmd.args[8]);

        /* enable tuner status flags */
        memcpy(cmd.args, "\x14\x00\x01\x05\x01\x00", 6);
        cmd.wlen = 6;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        memcpy(cmd.args, "\x14\x00\x01\x06\x01\x00", 6);
        cmd.wlen = 6;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        memcpy(cmd.args, "\x14\x00\x01\x07\x01\x00", 6);
        cmd.wlen = 6;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;
warm:
        /* init statistics in order signal app which are supported */
        c->strength.len = 1;
        c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        /* start statistics polling */
        schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(1000));

        dev->active = true;
        return 0;

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

static int si2157_sleep(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
        int ret;
        struct si2157_cmd cmd;

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

        dev->active = false;

        /* stop statistics polling */
        cancel_delayed_work_sync(&dev->stat_work);

        /* standby */
        memcpy(cmd.args, "\x16\x00", 2);
        cmd.wlen = 2;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

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

static int si2157_tune_wait(struct i2c_client *client, u8 is_digital)
{
#define TUN_TIMEOUT 40
#define DIG_TIMEOUT 30
#define ANALOG_TIMEOUT 150
        struct si2157_dev *dev = i2c_get_clientdata(client);
        int ret;
        unsigned long timeout;
        unsigned long start_time;
        u8 wait_status;
        u8  tune_lock_mask;

        if (is_digital)
                tune_lock_mask = 0x04;
        else
                tune_lock_mask = 0x02;

        mutex_lock(&dev->i2c_mutex);

        /* wait tuner command complete */
        start_time = jiffies;
        timeout = start_time + msecs_to_jiffies(TUN_TIMEOUT);
        while (1) {
                ret = i2c_master_recv(client, &wait_status,
                                      sizeof(wait_status));
                if (ret < 0) {
                        goto err_mutex_unlock;
                } else if (ret != sizeof(wait_status)) {
                        ret = -EREMOTEIO;
                        goto err_mutex_unlock;
                }

                if (time_after(jiffies, timeout))
                        break;

                /* tuner done? */
                if ((wait_status & 0x81) == 0x81)
                        break;
                usleep_range(5000, 10000);
        }

        dev_dbg(&client->dev, "tuning took %d ms, status=0x%x\n",
                jiffies_to_msecs(jiffies) - jiffies_to_msecs(start_time),
                wait_status);

        /* if we tuned ok, wait a bit for tuner lock */
        if (tuner_lock_debug && (wait_status & 0x81) == 0x81) {
                if (is_digital)
                        timeout = jiffies + msecs_to_jiffies(DIG_TIMEOUT);
                else
                        timeout = jiffies + msecs_to_jiffies(ANALOG_TIMEOUT);

                while (!time_after(jiffies, timeout)) {
                        ret = i2c_master_recv(client, &wait_status,
                                              sizeof(wait_status));
                        if (ret < 0) {
                                goto err_mutex_unlock;
                        } else if (ret != sizeof(wait_status)) {
                                ret = -EREMOTEIO;
                                goto err_mutex_unlock;
                        }

                        /* tuner locked? */
                        if (wait_status & tune_lock_mask)
                                break;
                        usleep_range(5000, 10000);
                }

                dev_dbg(&client->dev, "tuning+lock took %d ms, status=0x%x\n",
                        jiffies_to_msecs(jiffies) - jiffies_to_msecs(start_time),
                        wait_status);
        }

        if ((wait_status & 0xc0) != 0x80) {
                ret = -ETIMEDOUT;
                goto err_mutex_unlock;
        }

        mutex_unlock(&dev->i2c_mutex);
        return 0;

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

static int si2157_set_params(struct dvb_frontend *fe)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        int ret;
        struct si2157_cmd cmd;
        u8 bw, delivery_system;
        u32 bandwidth;
        u32 if_frequency = 5000000;

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

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

        if (SUPPORTS_1700KHz(dev) && c->bandwidth_hz <= 1700000) {
                bandwidth = 1700000;
                bw = 9;
        } else if (c->bandwidth_hz <= 6000000) {
                bandwidth = 6000000;
                bw = 6;
        } else if (SUPPORTS_1700KHz(dev) && c->bandwidth_hz <= 6100000) {
                bandwidth = 6100000;
                bw = 10;
        } else if (c->bandwidth_hz <= 7000000) {
                bandwidth = 7000000;
                bw = 7;
        } else {
                bandwidth = 8000000;
                bw = 8;
        }

        switch (c->delivery_system) {
        case SYS_ATSC:
                        delivery_system = 0x00;
                        if_frequency = 3250000;
                        break;
        case SYS_DVBC_ANNEX_B:
                        delivery_system = 0x10;
                        if_frequency = 4000000;
                        break;
        case SYS_DVBT:
        case SYS_DVBT2: /* it seems DVB-T and DVB-T2 both are 0x20 here */
                        delivery_system = 0x20;
                        break;
        case SYS_DVBC_ANNEX_A:
        case SYS_DVBC_ANNEX_C:
                        delivery_system = 0x30;
                        break;
        case SYS_ISDBT:
                        delivery_system = 0x40;
                        break;
        case SYS_DTMB:
                        delivery_system = 0x60;
                        break;
        default:
                        ret = -EINVAL;
                        goto err;
        }

        memcpy(cmd.args, "\x14\x00\x03\x07\x00\x00", 6);
        cmd.args[4] = delivery_system | bw;
        if (dev->inversion)
                cmd.args[5] = 0x01;
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* On SI2146, set DTV AGC source to DLIF_AGC_3DB */
        if (dev->part_id == SI2146)
                memcpy(cmd.args, "\x14\x00\x02\x07\x00\x01", 6);
        else
                memcpy(cmd.args, "\x14\x00\x02\x07\x00\x00", 6);
        cmd.args[4] = dev->if_port;
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set digital if frequency if needed */
        if (if_frequency != dev->if_frequency) {
                memcpy(cmd.args, "\x14\x00\x06\x07", 4);
                cmd.args[4] = (if_frequency / 1000) & 0xff;
                cmd.args[5] = ((if_frequency / 1000) >> 8) & 0xff;
                cmd.wlen = 6;
                cmd.rlen = 4;
                ret = si2157_cmd_execute(client, &cmd);
                if (ret)
                        goto err;

                dev->if_frequency = if_frequency;
        }

        /* set digital frequency */
        memcpy(cmd.args, "\x41\x00\x00\x00\x00\x00\x00\x00", 8);
        cmd.args[4] = (c->frequency >>  0) & 0xff;
        cmd.args[5] = (c->frequency >>  8) & 0xff;
        cmd.args[6] = (c->frequency >> 16) & 0xff;
        cmd.args[7] = (c->frequency >> 24) & 0xff;
        cmd.wlen = 8;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        dev->bandwidth = bandwidth;
        dev->frequency = c->frequency;

        si2157_tune_wait(client, 1); /* wait to complete, ignore any errors */

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

static int si2157_set_analog_params(struct dvb_frontend *fe,
                                    struct analog_parameters *params)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);
        char *std; /* for debugging */
        int ret;
        struct si2157_cmd cmd;
        u32 bandwidth = 0;
        u32 if_frequency = 0;
        u32 freq = 0;
        u64 tmp_lval = 0;
        u8 system = 0;
        u8 color = 0;    /* 0=NTSC/PAL, 0x10=SECAM */
        u8 invert_analog = 1; /* analog tuner spectrum; 0=normal, 1=inverted */

        if (!SUPPORTS_ATV_IF(dev)) {
                dev_info(&client->dev, "Analog tuning not supported yet for Si21%d\n",
                         dev->part_id);
                ret = -EINVAL;
                goto err;
        }

        if (!dev->active)
                si2157_init(fe);

        if (!dev->active) {
                ret = -EAGAIN;
                goto err;
        }
        if (params->mode == V4L2_TUNER_RADIO) {
        /*
         * std = "fm";
         * bandwidth = 1700000; //best can do for FM, AGC will be a mess though
         * if_frequency = 1250000;  //HVR-225x(saa7164), HVR-12xx(cx23885)
         * if_frequency = 6600000;  //HVR-9xx(cx231xx)
         * if_frequency = 5500000;  //HVR-19xx(pvrusb2)
         */
                dev_err(&client->dev, "si2157 does not currently support FM radio\n");
                ret = -EINVAL;
                goto err;
        }
        tmp_lval = params->frequency * 625LL;
        do_div(tmp_lval, 10); /* convert to HZ */
        freq = (u32)tmp_lval;

        if (freq < 1000000) /* is freq in KHz */
                freq = freq * 1000;
        dev->frequency = freq;

        /* if_frequency values based on tda187271C2 */
        if (params->std & (V4L2_STD_B | V4L2_STD_GH)) {
                if (freq >= 470000000) {
                        std = "palGH";
                        bandwidth = 8000000;
                        if_frequency = 6000000;
                        system = 1;
                        if (params->std &
                            (V4L2_STD_SECAM_G | V4L2_STD_SECAM_H)) {
                                std = "secamGH";
                                color = 0x10;
                        }
                } else {
                        std = "palB";
                        bandwidth = 7000000;
                        if_frequency = 6000000;
                        system = 0;
                        if (params->std & V4L2_STD_SECAM_B) {
                                std = "secamB";
                                color = 0x10;
                        }
                }
        } else if (params->std & V4L2_STD_MN) {
                std = "MN";
                bandwidth = 6000000;
                if_frequency = 5400000;
                system = 2;
        } else if (params->std & V4L2_STD_PAL_I) {
                std = "palI";
                bandwidth = 8000000;
                if_frequency = 7250000; /* TODO: does not work yet */
                system = 4;
        } else if (params->std & V4L2_STD_DK) {
                std = "palDK";
                bandwidth = 8000000;
                if_frequency = 6900000; /* TODO: does not work yet */
                system = 5;
                if (params->std & V4L2_STD_SECAM_DK) {
                        std = "secamDK";
                        color = 0x10;
                }
        } else if (params->std & V4L2_STD_SECAM_L) {
                std = "secamL";
                bandwidth = 8000000;
                if_frequency = 6750000; /* TODO: untested */
                system = 6;
                color = 0x10;
        } else if (params->std & V4L2_STD_SECAM_LC) {
                std = "secamL'";
                bandwidth = 7000000;
                if_frequency = 1250000; /* TODO: untested */
                system = 7;
                color = 0x10;
        } else {
                std = "unknown";
        }
        /* calc channel center freq */
        freq = freq - 1250000 + (bandwidth / 2);

        dev_dbg(&client->dev,
                "mode=%d system=%u std='%s' params->frequency=%u center freq=%u if=%u bandwidth=%u\n",
                params->mode, system, std, params->frequency,
                freq, if_frequency, bandwidth);

        /* set analog IF port */
        memcpy(cmd.args, "\x14\x00\x03\x06\x08\x02", 6);
        /* in using dev->if_port, we assume analog and digital IF's */
        /*   are always on different ports */
        /* assumes if_port definition is 0 or 1 for digital out */
        cmd.args[4] = (dev->if_port == 1) ? 8 : 10;
        /* Analog AGC assumed external */
        cmd.args[5] = (dev->if_port == 1) ? 2 : 1;
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set analog IF output config */
        memcpy(cmd.args, "\x14\x00\x0d\x06\x94\x64", 6);
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* make this distinct from a digital IF */
        dev->if_frequency = if_frequency | 1;

        /* calc and set tuner analog if center frequency */
        if_frequency = if_frequency + 1250000 - (bandwidth / 2);
        dev_dbg(&client->dev, "IF Ctr freq=%d\n", if_frequency);

        memcpy(cmd.args, "\x14\x00\x0C\x06", 4);
        cmd.args[4] = (if_frequency / 1000) & 0xff;
        cmd.args[5] = ((if_frequency / 1000) >> 8) & 0xff;
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set analog AGC config */
        memcpy(cmd.args, "\x14\x00\x07\x06\x32\xc8", 6);
        cmd.wlen = 6;
        cmd.rlen = 4;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set analog video mode */
        memcpy(cmd.args, "\x14\x00\x04\x06\x00\x00", 6);
        cmd.args[4] = system | color;
        /* can use dev->inversion if assumed applies to both digital/analog */
        if (invert_analog)
                cmd.args[5] |= 0x02;
        cmd.wlen = 6;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        /* set analog frequency */
        memcpy(cmd.args, "\x41\x01\x00\x00\x00\x00\x00\x00", 8);
        cmd.args[4] = (freq >>  0) & 0xff;
        cmd.args[5] = (freq >>  8) & 0xff;
        cmd.args[6] = (freq >> 16) & 0xff;
        cmd.args[7] = (freq >> 24) & 0xff;
        cmd.wlen = 8;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        dev->bandwidth = bandwidth;

        si2157_tune_wait(client, 0); /* wait to complete, ignore any errors */

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

static int si2157_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);

        *frequency = dev->frequency;
        dev_dbg(&client->dev, "freq=%u\n", dev->frequency);
        return 0;
}

static int si2157_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);

        *bandwidth = dev->bandwidth;
        dev_dbg(&client->dev, "bandwidth=%u\n", dev->bandwidth);
        return 0;
}

static int si2157_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
        struct i2c_client *client = fe->tuner_priv;
        struct si2157_dev *dev = i2c_get_clientdata(client);

        *frequency = dev->if_frequency & ~1; /* strip analog IF indicator bit */
        dev_dbg(&client->dev, "if_frequency=%u\n", *frequency);
        return 0;
}

static int si2157_get_rf_strength(struct dvb_frontend *fe, u16 *rssi)
{
        struct i2c_client *client = fe->tuner_priv;
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct si2157_cmd cmd;
        int ret;
        int strength;

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

        memcpy(cmd.args, "\x42\x00", 2);
        cmd.wlen = 2;
        cmd.rlen = 12;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        c->strength.stat[0].scale = FE_SCALE_DECIBEL;
        c->strength.stat[0].svalue = (s8)cmd.args[3] * 1000;

        /* normalize values based on Silicon Labs reference
         * add 100, then anything > 80 is 100% signal
         */
        strength = (s8)cmd.args[3] + 100;
        strength = clamp_val(strength, 0, 80);
        *rssi = (u16)(strength * 0xffff / 80);

        dev_dbg(&client->dev, "strength=%d rssi=%u\n",
                (s8)cmd.args[3], *rssi);

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

static const struct dvb_tuner_ops si2157_ops = {
        .info = {
                .name             = "Silicon Labs Si2141/Si2146/2147/2148/2157/2158",
                .frequency_min_hz =  42 * MHz,
                .frequency_max_hz = 870 * MHz,
        },

        .init = si2157_init,
        .sleep = si2157_sleep,
        .set_params = si2157_set_params,
        .set_analog_params = si2157_set_analog_params,
        .get_frequency     = si2157_get_frequency,
        .get_bandwidth     = si2157_get_bandwidth,
        .get_if_frequency  = si2157_get_if_frequency,

        .get_rf_strength   = si2157_get_rf_strength,
};

static void si2157_stat_work(struct work_struct *work)
{
        struct si2157_dev *dev = container_of(work, struct si2157_dev, stat_work.work);
        struct dvb_frontend *fe = dev->fe;
        struct i2c_client *client = fe->tuner_priv;
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct si2157_cmd cmd;
        int ret;

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

        memcpy(cmd.args, "\x42\x00", 2);
        cmd.wlen = 2;
        cmd.rlen = 12;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret)
                goto err;

        c->strength.stat[0].scale = FE_SCALE_DECIBEL;
        c->strength.stat[0].svalue = (s8) cmd.args[3] * 1000;

        schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(2000));
        return;
err:
        c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        dev_dbg(&client->dev, "failed=%d\n", ret);
}

static int si2157_probe(struct i2c_client *client)
{
        const struct i2c_device_id *id = i2c_client_get_device_id(client);
        struct si2157_config *cfg = client->dev.platform_data;
        struct dvb_frontend *fe = cfg->fe;
        struct si2157_dev *dev;
        struct si2157_cmd cmd;
        int ret;

        dev = kzalloc_obj(*dev);
        if (!dev) {
                ret = -ENOMEM;
                dev_err(&client->dev, "kzalloc() failed\n");
                goto err;
        }

        i2c_set_clientdata(client, dev);
        dev->fe = cfg->fe;
        dev->inversion = cfg->inversion;
        dev->dont_load_firmware = cfg->dont_load_firmware;
        dev->if_port = cfg->if_port;
        dev->part_id = (u8)id->driver_data;
        dev->if_frequency = 5000000; /* default value of property 0x0706 */
        mutex_init(&dev->i2c_mutex);
        INIT_DELAYED_WORK(&dev->stat_work, si2157_stat_work);

        /* check if the tuner is there */
        cmd.wlen = 0;
        cmd.rlen = 1;
        ret = si2157_cmd_execute(client, &cmd);
        if (ret && ret != -EAGAIN)
                goto err_kfree;

        memcpy(&fe->ops.tuner_ops, &si2157_ops, sizeof(struct dvb_tuner_ops));
        fe->tuner_priv = client;

#ifdef CONFIG_MEDIA_CONTROLLER
        if (cfg->mdev) {
                dev->mdev = cfg->mdev;

                dev->ent.name = KBUILD_MODNAME;
                dev->ent.function = MEDIA_ENT_F_TUNER;

                dev->pad[SI2157_PAD_RF_INPUT].flags = MEDIA_PAD_FL_SINK;
                dev->pad[SI2157_PAD_RF_INPUT].sig_type = PAD_SIGNAL_ANALOG;
                dev->pad[SI2157_PAD_VID_OUT].flags = MEDIA_PAD_FL_SOURCE;
                dev->pad[SI2157_PAD_VID_OUT].sig_type = PAD_SIGNAL_ANALOG;
                dev->pad[SI2157_PAD_AUD_OUT].flags = MEDIA_PAD_FL_SOURCE;
                dev->pad[SI2157_PAD_AUD_OUT].sig_type = PAD_SIGNAL_AUDIO;

                ret = media_entity_pads_init(&dev->ent, SI2157_NUM_PADS,
                                             &dev->pad[0]);

                if (ret)
                        goto err_kfree;

                ret = media_device_register_entity(cfg->mdev, &dev->ent);
                if (ret) {
                        media_entity_cleanup(&dev->ent);
                        goto err_kfree;
                }
        }
#endif

        dev_info(&client->dev, "Silicon Labs Si21%d successfully attached\n",
                 dev->part_id);

        return 0;

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

static void si2157_remove(struct i2c_client *client)
{
        struct si2157_dev *dev = i2c_get_clientdata(client);
        struct dvb_frontend *fe = dev->fe;

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

        /* stop statistics polling */
        cancel_delayed_work_sync(&dev->stat_work);

#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        if (dev->mdev)
                media_device_unregister_entity(&dev->ent);
#endif

        memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
        fe->tuner_priv = NULL;
        kfree(dev);
}

/*
 * The part_id used here will only be used on buggy devices that don't
 * accept firmware uploads. Non-buggy devices should just use "si2157" for
 * all SiLabs TER tuners, as the driver should auto-detect it.
 */
static const struct i2c_device_id si2157_id_table[] = {
        {"si2157", SI2157},
        {"si2146", SI2146},
        {"si2141", SI2141},
        {"si2177", SI2177},
        {}
};
MODULE_DEVICE_TABLE(i2c, si2157_id_table);

static struct i2c_driver si2157_driver = {
        .driver = {
                .name                = "si2157",
                .suppress_bind_attrs = true,
        },
        .probe          = si2157_probe,
        .remove         = si2157_remove,
        .id_table       = si2157_id_table,
};

module_i2c_driver(si2157_driver);

MODULE_DESCRIPTION("Silicon Labs Si2141/Si2146/2147/2148/2157/2158 silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE(SI2158_A20_FIRMWARE);
MODULE_FIRMWARE(SI2141_A10_FIRMWARE);
MODULE_FIRMWARE(SI2157_A30_FIRMWARE);
MODULE_FIRMWARE(SI2141_60_FIRMWARE);
MODULE_FIRMWARE(SI2141_61_FIRMWARE);
MODULE_FIRMWARE(SI2146_11_FIRMWARE);
MODULE_FIRMWARE(SI2147_50_FIRMWARE);
MODULE_FIRMWARE(SI2148_32_FIRMWARE);
MODULE_FIRMWARE(SI2148_33_FIRMWARE);
MODULE_FIRMWARE(SI2157_50_FIRMWARE);
MODULE_FIRMWARE(SI2158_50_FIRMWARE);
MODULE_FIRMWARE(SI2158_51_FIRMWARE);
MODULE_FIRMWARE(SI2177_50_FIRMWARE);