// SPDX-License-Identifier: GPL-2.0-or-later
/*
    tda18271-fe.c - driver for the Philips / NXP TDA18271 silicon tuner

    Copyright (C) 2007, 2008 Michael Krufky <mkrufky@linuxtv.org>

*/

#include "tda18271-priv.h"
#include "tda8290.h"

#include <linux/delay.h>
#include <linux/videodev2.h>

int tda18271_debug;
module_param_named(debug, tda18271_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debug level (info=1, map=2, reg=4, adv=8, cal=16 (or-able))");

static int tda18271_cal_on_startup = -1;
module_param_named(cal, tda18271_cal_on_startup, int, 0644);
MODULE_PARM_DESC(cal, "perform RF tracking filter calibration on startup");

static DEFINE_MUTEX(tda18271_list_mutex);
static LIST_HEAD(hybrid_tuner_instance_list);

/*---------------------------------------------------------------------*/

static int tda18271_toggle_output(struct dvb_frontend *fe, int standby)
{
        struct tda18271_priv *priv = fe->tuner_priv;

        int ret = tda18271_set_standby_mode(fe, standby ? 1 : 0,
                        priv->output_opt & TDA18271_OUTPUT_LT_OFF ? 1 : 0,
                        priv->output_opt & TDA18271_OUTPUT_XT_OFF ? 1 : 0);

        if (tda_fail(ret))
                goto fail;

        tda_dbg("%s mode: xtal oscillator %s, slave tuner loop through %s\n",
                standby ? "standby" : "active",
                priv->output_opt & TDA18271_OUTPUT_XT_OFF ? "off" : "on",
                priv->output_opt & TDA18271_OUTPUT_LT_OFF ? "off" : "on");
fail:
        return ret;
}

/*---------------------------------------------------------------------*/

static inline int charge_pump_source(struct dvb_frontend *fe, int force)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        return tda18271_charge_pump_source(fe,
                                           (priv->role == TDA18271_SLAVE) ?
                                           TDA18271_CAL_PLL :
                                           TDA18271_MAIN_PLL, force);
}

static inline void tda18271_set_if_notch(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;

        switch (priv->mode) {
        case TDA18271_ANALOG:
                regs[R_MPD]  &= ~0x80; /* IF notch = 0 */
                break;
        case TDA18271_DIGITAL:
                regs[R_MPD]  |= 0x80; /* IF notch = 1 */
                break;
        }
}

static int tda18271_channel_configuration(struct dvb_frontend *fe,
                                          struct tda18271_std_map_item *map,
                                          u32 freq, u32 bw)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;
        u32 N;

        /* update TV broadcast parameters */

        /* set standard */
        regs[R_EP3]  &= ~0x1f; /* clear std bits */
        regs[R_EP3]  |= (map->agc_mode << 3) | map->std;

        if (priv->id == TDA18271HDC2) {
                /* set rfagc to high speed mode */
                regs[R_EP3] &= ~0x04;
        }

        /* set cal mode to normal */
        regs[R_EP4]  &= ~0x03;

        /* update IF output level */
        regs[R_EP4]  &= ~0x1c; /* clear if level bits */
        regs[R_EP4]  |= (map->if_lvl << 2);

        /* update FM_RFn */
        regs[R_EP4]  &= ~0x80;
        regs[R_EP4]  |= map->fm_rfn << 7;

        /* update rf top / if top */
        regs[R_EB22]  = 0x00;
        regs[R_EB22] |= map->rfagc_top;
        ret = tda18271_write_regs(fe, R_EB22, 1);
        if (tda_fail(ret))
                goto fail;

        /* --------------------------------------------------------------- */

        /* disable Power Level Indicator */
        regs[R_EP1]  |= 0x40;

        /* make sure thermometer is off */
        regs[R_TM]   &= ~0x10;

        /* frequency dependent parameters */

        tda18271_calc_ir_measure(fe, &freq);

        tda18271_calc_bp_filter(fe, &freq);

        tda18271_calc_rf_band(fe, &freq);

        tda18271_calc_gain_taper(fe, &freq);

        /* --------------------------------------------------------------- */

        /* dual tuner and agc1 extra configuration */

        switch (priv->role) {
        case TDA18271_MASTER:
                regs[R_EB1]  |= 0x04; /* main vco */
                break;
        case TDA18271_SLAVE:
                regs[R_EB1]  &= ~0x04; /* cal vco */
                break;
        }

        /* agc1 always active */
        regs[R_EB1]  &= ~0x02;

        /* agc1 has priority on agc2 */
        regs[R_EB1]  &= ~0x01;

        ret = tda18271_write_regs(fe, R_EB1, 1);
        if (tda_fail(ret))
                goto fail;

        /* --------------------------------------------------------------- */

        N = map->if_freq * 1000 + freq;

        switch (priv->role) {
        case TDA18271_MASTER:
                tda18271_calc_main_pll(fe, N);
                tda18271_set_if_notch(fe);
                tda18271_write_regs(fe, R_MPD, 4);
                break;
        case TDA18271_SLAVE:
                tda18271_calc_cal_pll(fe, N);
                tda18271_write_regs(fe, R_CPD, 4);

                regs[R_MPD] = regs[R_CPD] & 0x7f;
                tda18271_set_if_notch(fe);
                tda18271_write_regs(fe, R_MPD, 1);
                break;
        }

        ret = tda18271_write_regs(fe, R_TM, 7);
        if (tda_fail(ret))
                goto fail;

        /* force charge pump source */
        charge_pump_source(fe, 1);

        msleep(1);

        /* return pll to normal operation */
        charge_pump_source(fe, 0);

        msleep(20);

        if (priv->id == TDA18271HDC2) {
                /* set rfagc to normal speed mode */
                if (map->fm_rfn)
                        regs[R_EP3] &= ~0x04;
                else
                        regs[R_EP3] |= 0x04;
                ret = tda18271_write_regs(fe, R_EP3, 1);
        }
fail:
        return ret;
}

static int tda18271_read_thermometer(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int tm;

        /* switch thermometer on */
        regs[R_TM]   |= 0x10;
        tda18271_write_regs(fe, R_TM, 1);

        /* read thermometer info */
        tda18271_read_regs(fe);

        if ((((regs[R_TM] & 0x0f) == 0x00) && ((regs[R_TM] & 0x20) == 0x20)) ||
            (((regs[R_TM] & 0x0f) == 0x08) && ((regs[R_TM] & 0x20) == 0x00))) {

                if ((regs[R_TM] & 0x20) == 0x20)
                        regs[R_TM] &= ~0x20;
                else
                        regs[R_TM] |= 0x20;

                tda18271_write_regs(fe, R_TM, 1);

                msleep(10); /* temperature sensing */

                /* read thermometer info */
                tda18271_read_regs(fe);
        }

        tm = tda18271_lookup_thermometer(fe);

        /* switch thermometer off */
        regs[R_TM]   &= ~0x10;
        tda18271_write_regs(fe, R_TM, 1);

        /* set CAL mode to normal */
        regs[R_EP4]  &= ~0x03;
        tda18271_write_regs(fe, R_EP4, 1);

        return tm;
}

/* ------------------------------------------------------------------ */

static int tda18271c2_rf_tracking_filters_correction(struct dvb_frontend *fe,
                                                     u32 freq)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_rf_tracking_filter_cal *map = priv->rf_cal_state;
        unsigned char *regs = priv->tda18271_regs;
        int i, ret;
        u8 tm_current, dc_over_dt, rf_tab;
        s32 rfcal_comp, approx;

        /* power up */
        ret = tda18271_set_standby_mode(fe, 0, 0, 0);
        if (tda_fail(ret))
                goto fail;

        /* read die current temperature */
        tm_current = tda18271_read_thermometer(fe);

        /* frequency dependent parameters */

        tda18271_calc_rf_cal(fe, &freq);
        rf_tab = regs[R_EB14];

        i = tda18271_lookup_rf_band(fe, &freq, NULL);
        if (tda_fail(i))
                return i;

        if ((0 == map[i].rf3) || (freq / 1000 < map[i].rf2)) {
                approx = map[i].rf_a1 * (s32)(freq / 1000 - map[i].rf1) +
                        map[i].rf_b1 + rf_tab;
        } else {
                approx = map[i].rf_a2 * (s32)(freq / 1000 - map[i].rf2) +
                        map[i].rf_b2 + rf_tab;
        }

        if (approx < 0)
                approx = 0;
        if (approx > 255)
                approx = 255;

        tda18271_lookup_map(fe, RF_CAL_DC_OVER_DT, &freq, &dc_over_dt);

        /* calculate temperature compensation */
        rfcal_comp = dc_over_dt * (s32)(tm_current - priv->tm_rfcal) / 1000;

        regs[R_EB14] = (unsigned char)(approx + rfcal_comp);
        ret = tda18271_write_regs(fe, R_EB14, 1);
fail:
        return ret;
}

static int tda18271_por(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;

        /* power up detector 1 */
        regs[R_EB12] &= ~0x20;
        ret = tda18271_write_regs(fe, R_EB12, 1);
        if (tda_fail(ret))
                goto fail;

        regs[R_EB18] &= ~0x80; /* turn agc1 loop on */
        regs[R_EB18] &= ~0x03; /* set agc1_gain to  6 dB */
        ret = tda18271_write_regs(fe, R_EB18, 1);
        if (tda_fail(ret))
                goto fail;

        regs[R_EB21] |= 0x03; /* set agc2_gain to -6 dB */

        /* POR mode */
        ret = tda18271_set_standby_mode(fe, 1, 0, 0);
        if (tda_fail(ret))
                goto fail;

        /* disable 1.5 MHz low pass filter */
        regs[R_EB23] &= ~0x04; /* forcelp_fc2_en = 0 */
        regs[R_EB23] &= ~0x02; /* XXX: lp_fc[2] = 0 */
        ret = tda18271_write_regs(fe, R_EB21, 3);
fail:
        return ret;
}

static int tda18271_calibrate_rf(struct dvb_frontend *fe, u32 freq)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        u32 N;

        /* set CAL mode to normal */
        regs[R_EP4]  &= ~0x03;
        tda18271_write_regs(fe, R_EP4, 1);

        /* switch off agc1 */
        regs[R_EP3]  |= 0x40; /* sm_lt = 1 */

        regs[R_EB18] |= 0x03; /* set agc1_gain to 15 dB */
        tda18271_write_regs(fe, R_EB18, 1);

        /* frequency dependent parameters */

        tda18271_calc_bp_filter(fe, &freq);
        tda18271_calc_gain_taper(fe, &freq);
        tda18271_calc_rf_band(fe, &freq);
        tda18271_calc_km(fe, &freq);

        tda18271_write_regs(fe, R_EP1, 3);
        tda18271_write_regs(fe, R_EB13, 1);

        /* main pll charge pump source */
        tda18271_charge_pump_source(fe, TDA18271_MAIN_PLL, 1);

        /* cal pll charge pump source */
        tda18271_charge_pump_source(fe, TDA18271_CAL_PLL, 1);

        /* force dcdc converter to 0 V */
        regs[R_EB14] = 0x00;
        tda18271_write_regs(fe, R_EB14, 1);

        /* disable plls lock */
        regs[R_EB20] &= ~0x20;
        tda18271_write_regs(fe, R_EB20, 1);

        /* set CAL mode to RF tracking filter calibration */
        regs[R_EP4]  |= 0x03;
        tda18271_write_regs(fe, R_EP4, 2);

        /* --------------------------------------------------------------- */

        /* set the internal calibration signal */
        N = freq;

        tda18271_calc_cal_pll(fe, N);
        tda18271_write_regs(fe, R_CPD, 4);

        /* downconvert internal calibration */
        N += 1000000;

        tda18271_calc_main_pll(fe, N);
        tda18271_write_regs(fe, R_MPD, 4);

        msleep(5);

        tda18271_write_regs(fe, R_EP2, 1);
        tda18271_write_regs(fe, R_EP1, 1);
        tda18271_write_regs(fe, R_EP2, 1);
        tda18271_write_regs(fe, R_EP1, 1);

        /* --------------------------------------------------------------- */

        /* normal operation for the main pll */
        tda18271_charge_pump_source(fe, TDA18271_MAIN_PLL, 0);

        /* normal operation for the cal pll  */
        tda18271_charge_pump_source(fe, TDA18271_CAL_PLL, 0);

        msleep(10); /* plls locking */

        /* launch the rf tracking filters calibration */
        regs[R_EB20]  |= 0x20;
        tda18271_write_regs(fe, R_EB20, 1);

        msleep(60); /* calibration */

        /* --------------------------------------------------------------- */

        /* set CAL mode to normal */
        regs[R_EP4]  &= ~0x03;

        /* switch on agc1 */
        regs[R_EP3]  &= ~0x40; /* sm_lt = 0 */

        regs[R_EB18] &= ~0x03; /* set agc1_gain to  6 dB */
        tda18271_write_regs(fe, R_EB18, 1);

        tda18271_write_regs(fe, R_EP3, 2);

        /* synchronization */
        tda18271_write_regs(fe, R_EP1, 1);

        /* get calibration result */
        tda18271_read_extended(fe);

        return regs[R_EB14];
}

static int tda18271_powerscan(struct dvb_frontend *fe,
                              u32 *freq_in, u32 *freq_out)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int sgn, bcal, count, wait, ret;
        u8 cid_target;
        u16 count_limit;
        u32 freq;

        freq = *freq_in;

        tda18271_calc_rf_band(fe, &freq);
        tda18271_calc_rf_cal(fe, &freq);
        tda18271_calc_gain_taper(fe, &freq);
        tda18271_lookup_cid_target(fe, &freq, &cid_target, &count_limit);

        tda18271_write_regs(fe, R_EP2, 1);
        tda18271_write_regs(fe, R_EB14, 1);

        /* downconvert frequency */
        freq += 1000000;

        tda18271_calc_main_pll(fe, freq);
        tda18271_write_regs(fe, R_MPD, 4);

        msleep(5); /* pll locking */

        /* detection mode */
        regs[R_EP4]  &= ~0x03;
        regs[R_EP4]  |= 0x01;
        tda18271_write_regs(fe, R_EP4, 1);

        /* launch power detection measurement */
        tda18271_write_regs(fe, R_EP2, 1);

        /* read power detection info, stored in EB10 */
        ret = tda18271_read_extended(fe);
        if (tda_fail(ret))
                return ret;

        /* algorithm initialization */
        sgn = 1;
        *freq_out = *freq_in;
        bcal = 0;
        count = 0;
        wait = false;

        while ((regs[R_EB10] & 0x3f) < cid_target) {
                /* downconvert updated freq to 1 MHz */
                freq = *freq_in + (sgn * count) + 1000000;

                tda18271_calc_main_pll(fe, freq);
                tda18271_write_regs(fe, R_MPD, 4);

                if (wait) {
                        msleep(5); /* pll locking */
                        wait = false;
                } else
                        udelay(100); /* pll locking */

                /* launch power detection measurement */
                tda18271_write_regs(fe, R_EP2, 1);

                /* read power detection info, stored in EB10 */
                ret = tda18271_read_extended(fe);
                if (tda_fail(ret))
                        return ret;

                count += 200;

                if (count <= count_limit)
                        continue;

                if (sgn <= 0)
                        break;

                sgn = -1 * sgn;
                count = 200;
                wait = true;
        }

        if ((regs[R_EB10] & 0x3f) >= cid_target) {
                bcal = 1;
                *freq_out = freq - 1000000;
        } else
                bcal = 0;

        tda_cal("bcal = %d, freq_in = %d, freq_out = %d (freq = %d)\n",
                bcal, *freq_in, *freq_out, freq);

        return bcal;
}

static int tda18271_powerscan_init(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;

        /* set standard to digital */
        regs[R_EP3]  &= ~0x1f; /* clear std bits */
        regs[R_EP3]  |= 0x12;

        /* set cal mode to normal */
        regs[R_EP4]  &= ~0x03;

        /* update IF output level */
        regs[R_EP4]  &= ~0x1c; /* clear if level bits */

        ret = tda18271_write_regs(fe, R_EP3, 2);
        if (tda_fail(ret))
                goto fail;

        regs[R_EB18] &= ~0x03; /* set agc1_gain to   6 dB */
        ret = tda18271_write_regs(fe, R_EB18, 1);
        if (tda_fail(ret))
                goto fail;

        regs[R_EB21] &= ~0x03; /* set agc2_gain to -15 dB */

        /* 1.5 MHz low pass filter */
        regs[R_EB23] |= 0x04; /* forcelp_fc2_en = 1 */
        regs[R_EB23] |= 0x02; /* lp_fc[2] = 1 */

        ret = tda18271_write_regs(fe, R_EB21, 3);
fail:
        return ret;
}

static int tda18271_rf_tracking_filters_init(struct dvb_frontend *fe, u32 freq)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_rf_tracking_filter_cal *map = priv->rf_cal_state;
        unsigned char *regs = priv->tda18271_regs;
        int bcal, rf, i;
        s32 divisor, dividend;
#define RF1 0
#define RF2 1
#define RF3 2
        u32 rf_default[3];
        u32 rf_freq[3];
        s32 prog_cal[3];
        s32 prog_tab[3];

        i = tda18271_lookup_rf_band(fe, &freq, NULL);

        if (tda_fail(i))
                return i;

        rf_default[RF1] = 1000 * map[i].rf1_def;
        rf_default[RF2] = 1000 * map[i].rf2_def;
        rf_default[RF3] = 1000 * map[i].rf3_def;

        for (rf = RF1; rf <= RF3; rf++) {
                if (0 == rf_default[rf])
                        return 0;
                tda_cal("freq = %d, rf = %d\n", freq, rf);

                /* look for optimized calibration frequency */
                bcal = tda18271_powerscan(fe, &rf_default[rf], &rf_freq[rf]);
                if (tda_fail(bcal))
                        return bcal;

                tda18271_calc_rf_cal(fe, &rf_freq[rf]);
                prog_tab[rf] = (s32)regs[R_EB14];

                if (1 == bcal)
                        prog_cal[rf] =
                                (s32)tda18271_calibrate_rf(fe, rf_freq[rf]);
                else
                        prog_cal[rf] = prog_tab[rf];

                switch (rf) {
                case RF1:
                        map[i].rf_a1 = 0;
                        map[i].rf_b1 = (prog_cal[RF1] - prog_tab[RF1]);
                        map[i].rf1   = rf_freq[RF1] / 1000;
                        break;
                case RF2:
                        dividend = (prog_cal[RF2] - prog_tab[RF2] -
                                    prog_cal[RF1] + prog_tab[RF1]);
                        divisor = (s32)(rf_freq[RF2] - rf_freq[RF1]) / 1000;
                        map[i].rf_a1 = (dividend / divisor);
                        map[i].rf2   = rf_freq[RF2] / 1000;
                        break;
                case RF3:
                        dividend = (prog_cal[RF3] - prog_tab[RF3] -
                                    prog_cal[RF2] + prog_tab[RF2]);
                        divisor = (s32)(rf_freq[RF3] - rf_freq[RF2]) / 1000;
                        map[i].rf_a2 = (dividend / divisor);
                        map[i].rf_b2 = (prog_cal[RF2] - prog_tab[RF2]);
                        map[i].rf3   = rf_freq[RF3] / 1000;
                        break;
                default:
                        BUG();
                }
        }

        return 0;
}

static int tda18271_calc_rf_filter_curve(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned int i;
        int ret;

        tda_info("performing RF tracking filter calibration\n");

        /* wait for die temperature stabilization */
        msleep(200);

        ret = tda18271_powerscan_init(fe);
        if (tda_fail(ret))
                goto fail;

        /* rf band calibration */
        for (i = 0; priv->rf_cal_state[i].rfmax != 0; i++) {
                ret =
                tda18271_rf_tracking_filters_init(fe, 1000 *
                                                  priv->rf_cal_state[i].rfmax);
                if (tda_fail(ret))
                        goto fail;
        }

        priv->tm_rfcal = tda18271_read_thermometer(fe);
fail:
        return ret;
}

/* ------------------------------------------------------------------ */

static int tda18271c2_rf_cal_init(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;

        /* test RF_CAL_OK to see if we need init */
        if ((regs[R_EP1] & 0x10) == 0)
                priv->cal_initialized = false;

        if (priv->cal_initialized)
                return 0;

        ret = tda18271_calc_rf_filter_curve(fe);
        if (tda_fail(ret))
                goto fail;

        ret = tda18271_por(fe);
        if (tda_fail(ret))
                goto fail;

        tda_info("RF tracking filter calibration complete\n");

        priv->cal_initialized = true;
        goto end;
fail:
        tda_info("RF tracking filter calibration failed!\n");
end:
        return ret;
}

static int tda18271c1_rf_tracking_filter_calibration(struct dvb_frontend *fe,
                                                     u32 freq, u32 bw)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;
        u32 N = 0;

        /* calculate bp filter */
        tda18271_calc_bp_filter(fe, &freq);
        tda18271_write_regs(fe, R_EP1, 1);

        regs[R_EB4]  &= 0x07;
        regs[R_EB4]  |= 0x60;
        tda18271_write_regs(fe, R_EB4, 1);

        regs[R_EB7]   = 0x60;
        tda18271_write_regs(fe, R_EB7, 1);

        regs[R_EB14]  = 0x00;
        tda18271_write_regs(fe, R_EB14, 1);

        regs[R_EB20]  = 0xcc;
        tda18271_write_regs(fe, R_EB20, 1);

        /* set cal mode to RF tracking filter calibration */
        regs[R_EP4]  |= 0x03;

        /* calculate cal pll */

        switch (priv->mode) {
        case TDA18271_ANALOG:
                N = freq - 1250000;
                break;
        case TDA18271_DIGITAL:
                N = freq + bw / 2;
                break;
        }

        tda18271_calc_cal_pll(fe, N);

        /* calculate main pll */

        switch (priv->mode) {
        case TDA18271_ANALOG:
                N = freq - 250000;
                break;
        case TDA18271_DIGITAL:
                N = freq + bw / 2 + 1000000;
                break;
        }

        tda18271_calc_main_pll(fe, N);

        ret = tda18271_write_regs(fe, R_EP3, 11);
        if (tda_fail(ret))
                return ret;

        msleep(5); /* RF tracking filter calibration initialization */

        /* search for K,M,CO for RF calibration */
        tda18271_calc_km(fe, &freq);
        tda18271_write_regs(fe, R_EB13, 1);

        /* search for rf band */
        tda18271_calc_rf_band(fe, &freq);

        /* search for gain taper */
        tda18271_calc_gain_taper(fe, &freq);

        tda18271_write_regs(fe, R_EP2, 1);
        tda18271_write_regs(fe, R_EP1, 1);
        tda18271_write_regs(fe, R_EP2, 1);
        tda18271_write_regs(fe, R_EP1, 1);

        regs[R_EB4]  &= 0x07;
        regs[R_EB4]  |= 0x40;
        tda18271_write_regs(fe, R_EB4, 1);

        regs[R_EB7]   = 0x40;
        tda18271_write_regs(fe, R_EB7, 1);
        msleep(10); /* pll locking */

        regs[R_EB20]  = 0xec;
        tda18271_write_regs(fe, R_EB20, 1);
        msleep(60); /* RF tracking filter calibration completion */

        regs[R_EP4]  &= ~0x03; /* set cal mode to normal */
        tda18271_write_regs(fe, R_EP4, 1);

        tda18271_write_regs(fe, R_EP1, 1);

        /* RF tracking filter correction for VHF_Low band */
        if (0 == tda18271_calc_rf_cal(fe, &freq))
                tda18271_write_regs(fe, R_EB14, 1);

        return 0;
}

/* ------------------------------------------------------------------ */

static int tda18271_ir_cal_init(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        int ret;

        ret = tda18271_read_regs(fe);
        if (tda_fail(ret))
                goto fail;

        /* test IR_CAL_OK to see if we need init */
        if ((regs[R_EP1] & 0x08) == 0)
                ret = tda18271_init_regs(fe);
fail:
        return ret;
}

static int tda18271_init(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        int ret;

        mutex_lock(&priv->lock);

        /* full power up */
        ret = tda18271_set_standby_mode(fe, 0, 0, 0);
        if (tda_fail(ret))
                goto fail;

        /* initialization */
        ret = tda18271_ir_cal_init(fe);
        if (tda_fail(ret))
                goto fail;

        if (priv->id == TDA18271HDC2)
                tda18271c2_rf_cal_init(fe);
fail:
        mutex_unlock(&priv->lock);

        return ret;
}

static int tda18271_sleep(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        int ret;

        mutex_lock(&priv->lock);

        /* enter standby mode, with required output features enabled */
        ret = tda18271_toggle_output(fe, 1);

        mutex_unlock(&priv->lock);

        return ret;
}

/* ------------------------------------------------------------------ */

static int tda18271_agc(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        int ret = 0;

        switch (priv->config) {
        case TDA8290_LNA_OFF:
                /* no external agc configuration required */
                if (tda18271_debug & DBG_ADV)
                        tda_dbg("no agc configuration provided\n");
                break;
        case TDA8290_LNA_ON_BRIDGE:
                /* switch with GPIO of saa713x */
                tda_dbg("invoking callback\n");
                if (fe->callback)
                        ret = fe->callback(priv->i2c_props.adap->algo_data,
                                           DVB_FRONTEND_COMPONENT_TUNER,
                                           TDA18271_CALLBACK_CMD_AGC_ENABLE,
                                           priv->mode);
                break;
        case TDA8290_LNA_GP0_HIGH_ON:
        case TDA8290_LNA_GP0_HIGH_OFF:
        default:
                /* n/a - currently not supported */
                tda_err("unsupported configuration: %d\n", priv->config);
                ret = -EINVAL;
                break;
        }
        return ret;
}

static int tda18271_tune(struct dvb_frontend *fe,
                         struct tda18271_std_map_item *map, u32 freq, u32 bw)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        int ret;

        tda_dbg("freq = %d, ifc = %d, bw = %d, agc_mode = %d, std = %d\n",
                freq, map->if_freq, bw, map->agc_mode, map->std);

        ret = tda18271_agc(fe);
        if (tda_fail(ret))
                tda_warn("failed to configure agc\n");

        ret = tda18271_init(fe);
        if (tda_fail(ret))
                goto fail;

        mutex_lock(&priv->lock);

        switch (priv->id) {
        case TDA18271HDC1:
                tda18271c1_rf_tracking_filter_calibration(fe, freq, bw);
                break;
        case TDA18271HDC2:
                tda18271c2_rf_tracking_filters_correction(fe, freq);
                break;
        }
        ret = tda18271_channel_configuration(fe, map, freq, bw);

        mutex_unlock(&priv->lock);
fail:
        return ret;
}

/* ------------------------------------------------------------------ */

static int tda18271_set_params(struct dvb_frontend *fe)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        u32 delsys = c->delivery_system;
        u32 bw = c->bandwidth_hz;
        u32 freq = c->frequency;
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_std_map *std_map = &priv->std;
        struct tda18271_std_map_item *map;
        int ret;

        priv->mode = TDA18271_DIGITAL;

        switch (delsys) {
        case SYS_ATSC:
                map = &std_map->atsc_6;
                bw = 6000000;
                break;
        case SYS_ISDBT:
        case SYS_DVBT:
        case SYS_DVBT2:
                if (bw <= 6000000) {
                        map = &std_map->dvbt_6;
                } else if (bw <= 7000000) {
                        map = &std_map->dvbt_7;
                } else {
                        map = &std_map->dvbt_8;
                }
                break;
        case SYS_DVBC_ANNEX_B:
                bw = 6000000;
                fallthrough;
        case SYS_DVBC_ANNEX_A:
        case SYS_DVBC_ANNEX_C:
                if (bw <= 6000000) {
                        map = &std_map->qam_6;
                } else if (bw <= 7000000) {
                        map = &std_map->qam_7;
                } else {
                        map = &std_map->qam_8;
                }
                break;
        default:
                tda_warn("modulation type not supported!\n");
                return -EINVAL;
        }

        /* When tuning digital, the analog demod must be tri-stated */
        if (fe->ops.analog_ops.standby)
                fe->ops.analog_ops.standby(fe);

        ret = tda18271_tune(fe, map, freq, bw);

        if (tda_fail(ret))
                goto fail;

        priv->if_freq   = map->if_freq;
        priv->frequency = freq;
        priv->bandwidth = bw;
fail:
        return ret;
}

static int tda18271_set_analog_params(struct dvb_frontend *fe,
                                      struct analog_parameters *params)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_std_map *std_map = &priv->std;
        struct tda18271_std_map_item *map;
        char *mode;
        int ret;
        u32 freq = params->frequency * 125 *
                ((params->mode == V4L2_TUNER_RADIO) ? 1 : 1000) / 2;

        priv->mode = TDA18271_ANALOG;

        if (params->mode == V4L2_TUNER_RADIO) {
                map = &std_map->fm_radio;
                mode = "fm";
        } else if (params->std & V4L2_STD_MN) {
                map = &std_map->atv_mn;

                mode = "MN";
        } else if (params->std & V4L2_STD_B) {
                map = &std_map->atv_b;
                mode = "B";
        } else if (params->std & V4L2_STD_GH) {
                map = &std_map->atv_gh;
                mode = "GH";
        } else if (params->std & V4L2_STD_PAL_I) {
                map = &std_map->atv_i;
                mode = "I";
        } else if (params->std & V4L2_STD_DK) {
                map = &std_map->atv_dk;
                mode = "DK";
        } else if (params->std & V4L2_STD_SECAM_L) {
                map = &std_map->atv_l;
                mode = "L";
        } else if (params->std & V4L2_STD_SECAM_LC) {
                map = &std_map->atv_lc;
                mode = "L'";
        } else {
                map = &std_map->atv_i;
                mode = "xx";
        }

        tda_dbg("setting tda18271 to system %s\n", mode);

        ret = tda18271_tune(fe, map, freq, 0);

        if (tda_fail(ret))
                goto fail;

        priv->if_freq   = map->if_freq;
        priv->frequency = freq;
        priv->bandwidth = 0;
fail:
        return ret;
}

static void tda18271_release(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;

        mutex_lock(&tda18271_list_mutex);

        if (priv)
                hybrid_tuner_release_state(priv);

        mutex_unlock(&tda18271_list_mutex);

        fe->tuner_priv = NULL;
}

static int tda18271_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        *frequency = priv->frequency;
        return 0;
}

static int tda18271_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        *bandwidth = priv->bandwidth;
        return 0;
}

static int tda18271_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        *frequency = (u32)priv->if_freq * 1000;
        return 0;
}

/* ------------------------------------------------------------------ */

#define tda18271_update_std(std_cfg, name) do {                         \
        if (map->std_cfg.if_freq +                                      \
                map->std_cfg.agc_mode + map->std_cfg.std +              \
                map->std_cfg.if_lvl + map->std_cfg.rfagc_top > 0) {     \
                tda_dbg("Using custom std config for %s\n", name);      \
                memcpy(&std->std_cfg, &map->std_cfg,                    \
                        sizeof(struct tda18271_std_map_item));          \
        } } while (0)

#define tda18271_dump_std_item(std_cfg, name) do {                      \
        tda_dbg("(%s) if_freq = %d, agc_mode = %d, std = %d, "          \
                "if_lvl = %d, rfagc_top = 0x%02x\n",                    \
                name, std->std_cfg.if_freq,                             \
                std->std_cfg.agc_mode, std->std_cfg.std,                \
                std->std_cfg.if_lvl, std->std_cfg.rfagc_top);           \
        } while (0)

static int tda18271_dump_std_map(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_std_map *std = &priv->std;

        tda_dbg("========== STANDARD MAP SETTINGS ==========\n");
        tda18271_dump_std_item(fm_radio, "  fm  ");
        tda18271_dump_std_item(atv_b,  "atv b ");
        tda18271_dump_std_item(atv_dk, "atv dk");
        tda18271_dump_std_item(atv_gh, "atv gh");
        tda18271_dump_std_item(atv_i,  "atv i ");
        tda18271_dump_std_item(atv_l,  "atv l ");
        tda18271_dump_std_item(atv_lc, "atv l'");
        tda18271_dump_std_item(atv_mn, "atv mn");
        tda18271_dump_std_item(atsc_6, "atsc 6");
        tda18271_dump_std_item(dvbt_6, "dvbt 6");
        tda18271_dump_std_item(dvbt_7, "dvbt 7");
        tda18271_dump_std_item(dvbt_8, "dvbt 8");
        tda18271_dump_std_item(qam_6,  "qam 6 ");
        tda18271_dump_std_item(qam_7,  "qam 7 ");
        tda18271_dump_std_item(qam_8,  "qam 8 ");

        return 0;
}

static int tda18271_update_std_map(struct dvb_frontend *fe,
                                   struct tda18271_std_map *map)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        struct tda18271_std_map *std = &priv->std;

        if (!map)
                return -EINVAL;

        tda18271_update_std(fm_radio, "fm");
        tda18271_update_std(atv_b,  "atv b");
        tda18271_update_std(atv_dk, "atv dk");
        tda18271_update_std(atv_gh, "atv gh");
        tda18271_update_std(atv_i,  "atv i");
        tda18271_update_std(atv_l,  "atv l");
        tda18271_update_std(atv_lc, "atv l'");
        tda18271_update_std(atv_mn, "atv mn");
        tda18271_update_std(atsc_6, "atsc 6");
        tda18271_update_std(dvbt_6, "dvbt 6");
        tda18271_update_std(dvbt_7, "dvbt 7");
        tda18271_update_std(dvbt_8, "dvbt 8");
        tda18271_update_std(qam_6,  "qam 6");
        tda18271_update_std(qam_7,  "qam 7");
        tda18271_update_std(qam_8,  "qam 8");

        return 0;
}

static int tda18271_get_id(struct dvb_frontend *fe)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        char *name;
        int ret;

        mutex_lock(&priv->lock);
        ret = tda18271_read_regs(fe);
        mutex_unlock(&priv->lock);

        if (ret) {
                tda_info("Error reading device ID @ %d-%04x, bailing out.\n",
                         i2c_adapter_id(priv->i2c_props.adap),
                         priv->i2c_props.addr);
                return -EIO;
        }

        switch (regs[R_ID] & 0x7f) {
        case 3:
                name = "TDA18271HD/C1";
                priv->id = TDA18271HDC1;
                break;
        case 4:
                name = "TDA18271HD/C2";
                priv->id = TDA18271HDC2;
                break;
        default:
                tda_info("Unknown device (%i) detected @ %d-%04x, device not supported.\n",
                         regs[R_ID], i2c_adapter_id(priv->i2c_props.adap),
                         priv->i2c_props.addr);
                return -EINVAL;
        }

        tda_info("%s detected @ %d-%04x\n", name,
                 i2c_adapter_id(priv->i2c_props.adap), priv->i2c_props.addr);

        return 0;
}

static int tda18271_setup_configuration(struct dvb_frontend *fe,
                                        struct tda18271_config *cfg)
{
        struct tda18271_priv *priv = fe->tuner_priv;

        priv->gate = (cfg) ? cfg->gate : TDA18271_GATE_AUTO;
        priv->role = (cfg) ? cfg->role : TDA18271_MASTER;
        priv->config = (cfg) ? cfg->config : 0;
        priv->small_i2c = (cfg) ?
                cfg->small_i2c : TDA18271_39_BYTE_CHUNK_INIT;
        priv->output_opt = (cfg) ?
                cfg->output_opt : TDA18271_OUTPUT_LT_XT_ON;

        return 0;
}

static inline int tda18271_need_cal_on_startup(struct tda18271_config *cfg)
{
        /* tda18271_cal_on_startup == -1 when cal module option is unset */
        return ((tda18271_cal_on_startup == -1) ?
                /* honor configuration setting */
                ((cfg) && (cfg->rf_cal_on_startup)) :
                /* module option overrides configuration setting */
                (tda18271_cal_on_startup)) ? 1 : 0;
}

static int tda18271_set_config(struct dvb_frontend *fe, void *priv_cfg)
{
        struct tda18271_config *cfg = (struct tda18271_config *) priv_cfg;

        tda18271_setup_configuration(fe, cfg);

        if (tda18271_need_cal_on_startup(cfg))
                tda18271_init(fe);

        /* override default std map with values in config struct */
        if ((cfg) && (cfg->std_map))
                tda18271_update_std_map(fe, cfg->std_map);

        return 0;
}

static const struct dvb_tuner_ops tda18271_tuner_ops = {
        .info = {
                .name = "NXP TDA18271HD",
                .frequency_min_hz  =  45 * MHz,
                .frequency_max_hz  = 864 * MHz,
                .frequency_step_hz = 62500
        },
        .init              = tda18271_init,
        .sleep             = tda18271_sleep,
        .set_params        = tda18271_set_params,
        .set_analog_params = tda18271_set_analog_params,
        .release           = tda18271_release,
        .set_config        = tda18271_set_config,
        .get_frequency     = tda18271_get_frequency,
        .get_bandwidth     = tda18271_get_bandwidth,
        .get_if_frequency  = tda18271_get_if_frequency,
};

struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
                                     struct i2c_adapter *i2c,
                                     struct tda18271_config *cfg)
{
        struct tda18271_priv *priv = NULL;
        int instance, ret;

        mutex_lock(&tda18271_list_mutex);

        instance = hybrid_tuner_request_state(struct tda18271_priv, priv,
                                              hybrid_tuner_instance_list,
                                              i2c, addr, "tda18271");
        switch (instance) {
        case 0:
                goto fail;
        case 1:
                /* new tuner instance */
                fe->tuner_priv = priv;

                tda18271_setup_configuration(fe, cfg);

                priv->cal_initialized = false;
                mutex_init(&priv->lock);

                ret = tda18271_get_id(fe);
                if (tda_fail(ret))
                        goto fail;

                ret = tda18271_assign_map_layout(fe);
                if (tda_fail(ret))
                        goto fail;

                /* if delay_cal is set, delay IR & RF calibration until init()
                 * module option 'cal' overrides this delay */
                if ((cfg->delay_cal) && (!tda18271_need_cal_on_startup(cfg)))
                        break;

                mutex_lock(&priv->lock);
                tda18271_init_regs(fe);

                if ((tda18271_need_cal_on_startup(cfg)) &&
                    (priv->id == TDA18271HDC2))
                        tda18271c2_rf_cal_init(fe);

                /* enter standby mode, with required output features enabled */
                ret = tda18271_toggle_output(fe, 1);
                tda_fail(ret);

                mutex_unlock(&priv->lock);
                break;
        default:
                /* existing tuner instance */
                fe->tuner_priv = priv;

                /* allow dvb driver to override configuration settings */
                if (cfg) {
                        if (cfg->gate != TDA18271_GATE_ANALOG)
                                priv->gate = cfg->gate;
                        if (cfg->role)
                                priv->role = cfg->role;
                        if (cfg->config)
                                priv->config = cfg->config;
                        if (cfg->small_i2c)
                                priv->small_i2c = cfg->small_i2c;
                        if (cfg->output_opt)
                                priv->output_opt = cfg->output_opt;
                        if (cfg->std_map)
                                tda18271_update_std_map(fe, cfg->std_map);
                }
                if (tda18271_need_cal_on_startup(cfg))
                        tda18271_init(fe);
                break;
        }

        /* override default std map with values in config struct */
        if ((cfg) && (cfg->std_map))
                tda18271_update_std_map(fe, cfg->std_map);

        mutex_unlock(&tda18271_list_mutex);

        memcpy(&fe->ops.tuner_ops, &tda18271_tuner_ops,
               sizeof(struct dvb_tuner_ops));

        if (tda18271_debug & (DBG_MAP | DBG_ADV))
                tda18271_dump_std_map(fe);

        return fe;
fail:
        mutex_unlock(&tda18271_list_mutex);

        tda18271_release(fe);
        return NULL;
}
EXPORT_SYMBOL_GPL(tda18271_attach);
MODULE_DESCRIPTION("NXP TDA18271HD analog / digital tuner driver");
MODULE_AUTHOR("Michael Krufky <mkrufky@linuxtv.org>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.4");