tua9001.c

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/*
 * Infineon TUA 9001 silicon tuner driver
 *
 * Copyright (C) 2009 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 "tua9001.h"
#include "tua9001_priv.h"

/* write register */
static int tua9001_wr_reg(struct tua9001_priv *priv, u8 reg, u16 val)
{
    int ret;
    u8 buf[3] = { reg, (val >> 8) & 0xff, (val >> 0) & 0xff };
    struct i2c_msg msg[1] = {
        {
            .addr = priv->cfg->i2c_addr,
            .flags = 0,
            .len = sizeof(buf),
            .buf = buf,
        }
    };

    ret = i2c_transfer(priv->i2c, msg, 1);
    if (ret == 1) {
        ret = 0;
    } else {
        dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
                KBUILD_MODNAME, ret, reg);
        ret = -EREMOTEIO;
    }

    return ret;
}

static int tua9001_release(struct dvb_frontend *fe)
{
    struct tua9001_priv *priv = fe->tuner_priv;
    int ret = 0;

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

    if (fe->callback)
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_CEN, 0);

    kfree(fe->tuner_priv);
    fe->tuner_priv = NULL;

    return ret;
}

static int tua9001_init(struct dvb_frontend *fe)
{
    struct tua9001_priv *priv = fe->tuner_priv;
    int ret = 0;
    u8 i;
    struct reg_val data[] = {
        { 0x1e, 0x6512 },
        { 0x25, 0xb888 },
        { 0x39, 0x5460 },
        { 0x3b, 0x00c0 },
        { 0x3a, 0xf000 },
        { 0x08, 0x0000 },
        { 0x32, 0x0030 },
        { 0x41, 0x703a },
        { 0x40, 0x1c78 },
        { 0x2c, 0x1c00 },
        { 0x36, 0xc013 },
        { 0x37, 0x6f18 },
        { 0x27, 0x0008 },
        { 0x2a, 0x0001 },
        { 0x34, 0x0a40 },
    };

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

    if (fe->callback) {
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RESETN, 0);
        if (ret < 0)
            goto err;
    }

    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c-gate */

    for (i = 0; i < ARRAY_SIZE(data); i++) {
        ret = tua9001_wr_reg(priv, data[i].reg, data[i].val);
        if (ret < 0)
            goto err_i2c_gate_ctrl;
    }

err_i2c_gate_ctrl:
    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c-gate */
err:
    if (ret < 0)
        dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);

    return ret;
}

static int tua9001_sleep(struct dvb_frontend *fe)
{
    struct tua9001_priv *priv = fe->tuner_priv;
    int ret = 0;

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

    if (fe->callback)
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RESETN, 1);

    if (ret < 0)
        dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);

    return ret;
}

static int tua9001_set_params(struct dvb_frontend *fe)
{
    struct tua9001_priv *priv = fe->tuner_priv;
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    int ret, i;
    u16 val;
    u32 frequency;
    struct reg_val data[2];

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

    switch (c->delivery_system) {
    case SYS_DVBT:
        switch (c->bandwidth_hz) {
        case 8000000:
            val  = 0x0000;
            break;
        case 7000000:
            val  = 0x1000;
            break;
        case 6000000:
            val  = 0x2000;
            break;
        case 5000000:
            val  = 0x3000;
            break;
        default:
            ret = -EINVAL;
            goto err;
        }
        break;
    default:
        ret = -EINVAL;
        goto err;
    }

    data[0].reg = 0x04;
    data[0].val = val;

    frequency = (c->frequency - 150000000);
    frequency /= 100;
    frequency *= 48;
    frequency /= 10000;

    data[1].reg = 0x1f;
    data[1].val = frequency;

    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c-gate */

    if (fe->callback) {
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RXEN, 0);
        if (ret < 0)
            goto err_i2c_gate_ctrl;
    }

    for (i = 0; i < ARRAY_SIZE(data); i++) {
        ret = tua9001_wr_reg(priv, data[i].reg, data[i].val);
        if (ret < 0)
            goto err_i2c_gate_ctrl;
    }

    if (fe->callback) {
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RXEN, 1);
        if (ret < 0)
            goto err_i2c_gate_ctrl;
    }

err_i2c_gate_ctrl:
    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c-gate */
err:
    if (ret < 0)
        dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);

    return ret;
}

static int tua9001_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
    struct tua9001_priv *priv = fe->tuner_priv;

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

    *frequency = 0; /* Zero-IF */

    return 0;
}

static const struct dvb_tuner_ops tua9001_tuner_ops = {
    .info = {
        .name           = "Infineon TUA 9001",

        .frequency_min  = 170000000,
        .frequency_max  = 862000000,
        .frequency_step = 0,
    },

    .release = tua9001_release,

    .init = tua9001_init,
    .sleep = tua9001_sleep,
    .set_params = tua9001_set_params,

    .get_if_frequency = tua9001_get_if_frequency,
};

struct dvb_frontend *tua9001_attach(struct dvb_frontend *fe,
        struct i2c_adapter *i2c, struct tua9001_config *cfg)
{
    struct tua9001_priv *priv = NULL;
    int ret;

    priv = kzalloc(sizeof(struct tua9001_priv), GFP_KERNEL);
    if (priv == NULL)
        return NULL;

    priv->cfg = cfg;
    priv->i2c = i2c;

    if (fe->callback) {
        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_CEN, 1);
        if (ret < 0)
            goto err;

        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RXEN, 0);
        if (ret < 0)
            goto err;

        ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
                TUA9001_CMD_RESETN, 1);
        if (ret < 0)
            goto err;
    }

    dev_info(&priv->i2c->dev,
            "%s: Infineon TUA 9001 successfully attached\n",
            KBUILD_MODNAME);

    memcpy(&fe->ops.tuner_ops, &tua9001_tuner_ops,
            sizeof(struct dvb_tuner_ops));

    fe->tuner_priv = priv;
    return fe;
err:
    dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
    kfree(priv);
    return NULL;
}
EXPORT_SYMBOL(tua9001_attach);

MODULE_DESCRIPTION("Infineon TUA 9001 silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <[email protected]>");
MODULE_LICENSE("GPL");