cxd2820r_c.c

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/*
 * Sony CXD2820R demodulator driver
 *
 * Copyright (C) 2010 Antti Palosaari <[email protected]>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */


#include "cxd2820r_priv.h"

int cxd2820r_set_frontend_c(struct dvb_frontend *fe)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    int ret, i;
    u8 buf[2];
    u32 if_freq;
    u16 if_ctl;
    u64 num;
    struct reg_val_mask tab[] = {
        { 0x00080, 0x01, 0xff },
        { 0x00081, 0x05, 0xff },
        { 0x00085, 0x07, 0xff },
        { 0x00088, 0x01, 0xff },

        { 0x00082, 0x20, 0x60 },
        { 0x1016a, 0x48, 0xff },
        { 0x100a5, 0x00, 0x01 },
        { 0x10020, 0x06, 0x07 },
        { 0x10059, 0x50, 0xff },
        { 0x10087, 0x0c, 0x3c },
        { 0x1008b, 0x07, 0xff },
        { 0x1001f, priv->cfg.if_agc_polarity << 7, 0x80 },
        { 0x10070, priv->cfg.ts_mode, 0xff },
    };

    dev_dbg(&priv->i2c->dev, "%s: frequency=%d symbol_rate=%d\n", __func__,
            c->frequency, c->symbol_rate);

    /* program tuner */
    if (fe->ops.tuner_ops.set_params)
        fe->ops.tuner_ops.set_params(fe);

    if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
        for (i = 0; i < ARRAY_SIZE(tab); i++) {
            ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
                tab[i].val, tab[i].mask);
            if (ret)
                goto error;
        }
    }

    priv->delivery_system = SYS_DVBC_ANNEX_A;
    priv->ber_running = 0; /* tune stops BER counter */

    /* program IF frequency */
    if (fe->ops.tuner_ops.get_if_frequency) {
        ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
        if (ret)
            goto error;
    } else
        if_freq = 0;

    dev_dbg(&priv->i2c->dev, "%s: if_freq=%d\n", __func__, if_freq);

    num = if_freq / 1000; /* Hz => kHz */
    num *= 0x4000;
    if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
    buf[0] = (if_ctl >> 8) & 0x3f;
    buf[1] = (if_ctl >> 0) & 0xff;

    ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
    if (ret)
        goto error;

    ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
    if (ret)
        goto error;

    ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
    if (ret)
        goto error;

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    int ret;
    u8 buf[2];

    ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
    if (ret)
        goto error;

    c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);

    ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
    if (ret)
        goto error;

    switch ((buf[0] >> 0) & 0x07) {
    case 0:
        c->modulation = QAM_16;
        break;
    case 1:
        c->modulation = QAM_32;
        break;
    case 2:
        c->modulation = QAM_64;
        break;
    case 3:
        c->modulation = QAM_128;
        break;
    case 4:
        c->modulation = QAM_256;
        break;
    }

    switch ((buf[0] >> 7) & 0x01) {
    case 0:
        c->inversion = INVERSION_OFF;
        break;
    case 1:
        c->inversion = INVERSION_ON;
        break;
    }

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret;
    u8 buf[3], start_ber = 0;
    *ber = 0;

    if (priv->ber_running) {
        ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
        if (ret)
            goto error;

        if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
            *ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
            start_ber = 1;
        }
    } else {
        priv->ber_running = 1;
        start_ber = 1;
    }

    if (start_ber) {
        /* (re)start BER */
        ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
        if (ret)
            goto error;
    }

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
    u16 *strength)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret;
    u8 buf[2];
    u16 tmp;

    ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
    if (ret)
        goto error;

    tmp = (buf[0] & 0x03) << 8 | buf[1];
    tmp = (~tmp & 0x03ff);

    if (tmp == 512)
        /* ~no signal */
        tmp = 0;
    else if (tmp > 350)
        tmp = 350;

    /* scale value to 0x0000-0xffff */
    *strength = tmp * 0xffff / (350-0);

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret;
    u8 tmp;
    unsigned int A, B;
    /* report SNR in dB * 10 */

    ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
    if (ret)
        goto error;

    if (((tmp >> 0) & 0x03) % 2) {
        A = 875;
        B = 650;
    } else {
        A = 950;
        B = 760;
    }

    ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
    if (ret)
        goto error;

    #define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
    if (tmp)
        *snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
            / 10;
    else
        *snr = 0;

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
{
    *ucblocks = 0;
    /* no way to read ? */
    return 0;
}

int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret;
    u8 buf[2];
    *status = 0;

    ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
    if (ret)
        goto error;

    if (((buf[0] >> 0) & 0x01) == 1) {
        *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
            FE_HAS_VITERBI | FE_HAS_SYNC;

        if (((buf[1] >> 3) & 0x01) == 1) {
            *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
                FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
        }
    }

    dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
            buf[1]);

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_init_c(struct dvb_frontend *fe)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret;

    ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
    if (ret)
        goto error;

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_sleep_c(struct dvb_frontend *fe)
{
    struct cxd2820r_priv *priv = fe->demodulator_priv;
    int ret, i;
    struct reg_val_mask tab[] = {
        { 0x000ff, 0x1f, 0xff },
        { 0x00085, 0x00, 0xff },
        { 0x00088, 0x01, 0xff },
        { 0x00081, 0x00, 0xff },
        { 0x00080, 0x00, 0xff },
    };

    dev_dbg(&priv->i2c->dev, "%s\n", __func__);

    priv->delivery_system = SYS_UNDEFINED;

    for (i = 0; i < ARRAY_SIZE(tab); i++) {
        ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
            tab[i].mask);
        if (ret)
            goto error;
    }

    return ret;
error:
    dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
    return ret;
}

int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
    struct dvb_frontend_tune_settings *s)
{
    s->min_delay_ms = 500;
    s->step_size = 0; /* no zigzag */
    s->max_drift = 0;

    return 0;
}