vp7045-fe.c

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/* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
 * DVB-T receiver.
 *
 * Copyright (C) 2004-5 Patrick Boettcher ([email protected])
 *
 * Thanks to Twinhan who kindly provided hardware and information.
 *
 *  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, version 2.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 *
 */
#include "vp7045.h"

/* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
 *
 * Programming is hidden inside the firmware, so set_frontend is very easy.
 * Even though there is a Firmware command that one can use to access the demod
 * via its registers. This is used for status information.
 */

struct vp7045_fe_state {
    struct dvb_frontend fe;
    struct dvb_usb_device *d;
};

static int vp7045_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    u8 s0 = vp7045_read_reg(state->d,0x00),
       s1 = vp7045_read_reg(state->d,0x01),
       s3 = vp7045_read_reg(state->d,0x03);

    *status = 0;
    if (s0 & (1 << 4))
        *status |= FE_HAS_CARRIER;
    if (s0 & (1 << 1))
        *status |= FE_HAS_VITERBI;
    if (s0 & (1 << 5))
        *status |= FE_HAS_LOCK;
    if (s1 & (1 << 1))
        *status |= FE_HAS_SYNC;
    if (s3 & (1 << 6))
        *status |= FE_HAS_SIGNAL;

    if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
            (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
        *status &= ~FE_HAS_LOCK;

    return 0;
}

static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
           (vp7045_read_reg(state->d, 0x0E) << 8) |
        vp7045_read_reg(state->d, 0x0F);
    return 0;
}

static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
            vp7045_read_reg(state->d, 0x11);
    return 0;
}

static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
        vp7045_read_reg(state->d, 0x15);

    *strength = ~signal;
    return 0;
}

static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    u8 _snr = vp7045_read_reg(state->d, 0x09);
    *snr = (_snr << 8) | _snr;
    return 0;
}

static int vp7045_fe_init(struct dvb_frontend* fe)
{
    return 0;
}

static int vp7045_fe_sleep(struct dvb_frontend* fe)
{
    return 0;
}

static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
    tune->min_delay_ms = 800;
    return 0;
}

static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
    struct vp7045_fe_state *state = fe->demodulator_priv;
    u8 buf[5];
    u32 freq = fep->frequency / 1000;

    buf[0] = (freq >> 16) & 0xff;
    buf[1] = (freq >>  8) & 0xff;
    buf[2] =  freq        & 0xff;
    buf[3] = 0;

    switch (fep->bandwidth_hz) {
    case 8000000:
        buf[4] = 8;
        break;
    case 7000000:
        buf[4] = 7;
        break;
    case 6000000:
        buf[4] = 6;
        break;
    default:
        return -EINVAL;
    }

    vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
    return 0;
}

static void vp7045_fe_release(struct dvb_frontend* fe)
{
    struct vp7045_fe_state *state = fe->demodulator_priv;
    kfree(state);
}

static struct dvb_frontend_ops vp7045_fe_ops;

struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
{
    struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
    if (s == NULL)
        goto error;

    s->d = d;
    memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
    s->fe.demodulator_priv = s;

    return &s->fe;
error:
    return NULL;
}


static struct dvb_frontend_ops vp7045_fe_ops = {
    .delsys = { SYS_DVBT },
    .info = {
        .name           = "Twinhan VP7045/46 USB DVB-T",
        .frequency_min      = 44250000,
        .frequency_max      = 867250000,
        .frequency_stepsize = 1000,
        .caps = FE_CAN_INVERSION_AUTO |
                FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
                FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
                FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
                FE_CAN_TRANSMISSION_MODE_AUTO |
                FE_CAN_GUARD_INTERVAL_AUTO |
                FE_CAN_RECOVER |
                FE_CAN_HIERARCHY_AUTO,
    },

    .release = vp7045_fe_release,

    .init = vp7045_fe_init,
    .sleep = vp7045_fe_sleep,

    .set_frontend = vp7045_fe_set_frontend,
    .get_tune_settings = vp7045_fe_get_tune_settings,

    .read_status = vp7045_fe_read_status,
    .read_ber = vp7045_fe_read_ber,
    .read_signal_strength = vp7045_fe_read_signal_strength,
    .read_snr = vp7045_fe_read_snr,
    .read_ucblocks = vp7045_fe_read_unc_blocks,
};