dtt200u-fe.c

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/* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
 * Typhoon/ Yuan DVB-T USB2.0 receiver.
 *
 * Copyright (C) 2005 Patrick Boettcher <[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, version 2.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 */
#include "dtt200u.h"

struct dtt200u_fe_state {
    struct dvb_usb_device *d;

    fe_status_t stat;

    struct dtv_frontend_properties fep;
    struct dvb_frontend frontend;
};

static int dtt200u_fe_read_status(struct dvb_frontend* fe, fe_status_t *stat)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 st = GET_TUNE_STATUS, b[3];

    dvb_usb_generic_rw(state->d,&st,1,b,3,0);

    switch (b[0]) {
        case 0x01:
            *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |
                FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
            break;
        case 0x00: /* pending */
            *stat = FE_TIMEDOUT; /* during set_frontend */
            break;
        default:
        case 0x02: /* failed */
            *stat = 0;
            break;
    }
    return 0;
}

static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 bw = GET_VIT_ERR_CNT,b[3];
    dvb_usb_generic_rw(state->d,&bw,1,b,3,0);
    *ber = (b[0] << 16) | (b[1] << 8) | b[2];
    return 0;
}

static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 bw = GET_RS_UNCOR_BLK_CNT,b[2];

    dvb_usb_generic_rw(state->d,&bw,1,b,2,0);
    *unc = (b[0] << 8) | b[1];
    return 0;
}

static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 bw = GET_AGC, b;
    dvb_usb_generic_rw(state->d,&bw,1,&b,1,0);
    *strength = (b << 8) | b;
    return 0;
}

static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 bw = GET_SNR,br;
    dvb_usb_generic_rw(state->d,&bw,1,&br,1,0);
    *snr = ~((br << 8) | br);
    return 0;
}

static int dtt200u_fe_init(struct dvb_frontend* fe)
{
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    u8 b = SET_INIT;
    return dvb_usb_generic_write(state->d,&b,1);
}

static int dtt200u_fe_sleep(struct dvb_frontend* fe)
{
    return dtt200u_fe_init(fe);
}

static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
    tune->min_delay_ms = 1500;
    tune->step_size = 0;
    tune->max_drift = 0;
    return 0;
}

static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    int i;
    fe_status_t st;
    u16 freq = fep->frequency / 250000;
    u8 bwbuf[2] = { SET_BANDWIDTH, 0 },freqbuf[3] = { SET_RF_FREQ, 0, 0 };

    switch (fep->bandwidth_hz) {
    case 8000000:
        bwbuf[1] = 8;
        break;
    case 7000000:
        bwbuf[1] = 7;
        break;
    case 6000000:
        bwbuf[1] = 6;
        break;
    default:
        return -EINVAL;
    }

    dvb_usb_generic_write(state->d,bwbuf,2);

    freqbuf[1] = freq & 0xff;
    freqbuf[2] = (freq >> 8) & 0xff;
    dvb_usb_generic_write(state->d,freqbuf,3);

    for (i = 0; i < 30; i++) {
        msleep(20);
        dtt200u_fe_read_status(fe, &st);
        if (st & FE_TIMEDOUT)
            continue;
    }

    return 0;
}

static int dtt200u_fe_get_frontend(struct dvb_frontend* fe)
{
    struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
    struct dtt200u_fe_state *state = fe->demodulator_priv;
    memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));
    return 0;
}

static void dtt200u_fe_release(struct dvb_frontend* fe)
{
    struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv;
    kfree(state);
}

static struct dvb_frontend_ops dtt200u_fe_ops;

struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)
{
    struct dtt200u_fe_state* state = NULL;

    /* allocate memory for the internal state */
    state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);
    if (state == NULL)
        goto error;

    deb_info("attaching frontend dtt200u\n");

    state->d = d;

    memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));
    state->frontend.demodulator_priv = state;

    return &state->frontend;
error:
    return NULL;
}

static struct dvb_frontend_ops dtt200u_fe_ops = {
    .delsys = { SYS_DVBT },
    .info = {
        .name           = "WideView USB DVB-T",
        .frequency_min      = 44250000,
        .frequency_max      = 867250000,
        .frequency_stepsize = 250000,
        .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 = dtt200u_fe_release,

    .init = dtt200u_fe_init,
    .sleep = dtt200u_fe_sleep,

    .set_frontend = dtt200u_fe_set_frontend,
    .get_frontend = dtt200u_fe_get_frontend,
    .get_tune_settings = dtt200u_fe_get_tune_settings,

    .read_status = dtt200u_fe_read_status,
    .read_ber = dtt200u_fe_read_ber,
    .read_signal_strength = dtt200u_fe_read_signal_strength,
    .read_snr = dtt200u_fe_read_snr,
    .read_ucblocks = dtt200u_fe_read_unc_blocks,
};