vp702x-fe.c

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/* DVB frontend part of the Linux driver for the TwinhanDTV StarBox USB2.0
 * DVB-S receiver.
 *
 * Copyright (C) 2005 Ralph Metzler <[email protected]>
 *                    Metzler Brothers Systementwicklung GbR
 *
 * Copyright (C) 2005 Patrick Boettcher <[email protected]>
 *
 * Thanks to Twinhan who kindly provided hardware and information.
 *
 * This file can be removed soon, after the DST-driver is rewritten to provice
 * the frontend-controlling separately.
 *
 *  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 "vp702x.h"

struct vp702x_fe_state {
    struct dvb_frontend fe;
    struct dvb_usb_device *d;

    struct dvb_frontend_ops ops;

    fe_sec_voltage_t voltage;
    fe_sec_tone_mode_t tone_mode;

    u8 lnb_buf[8];

    u8 lock;
    u8 sig;
    u8 snr;

    unsigned long next_status_check;
    unsigned long status_check_interval;
};

static int vp702x_fe_refresh_state(struct vp702x_fe_state *st)
{
    struct vp702x_device_state *dst = st->d->priv;
    u8 *buf;

    if (time_after(jiffies, st->next_status_check)) {
        mutex_lock(&dst->buf_mutex);
        buf = dst->buf;

        vp702x_usb_in_op(st->d, READ_STATUS, 0, 0, buf, 10);
        st->lock = buf[4];

        vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x11, 0, buf, 1);
        st->snr = buf[0];

        vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x15, 0, buf, 1);
        st->sig = buf[0];

        mutex_unlock(&dst->buf_mutex);
        st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
    }
    return 0;
}

static u8 vp702x_chksum(u8 *buf,int f, int count)
{
    u8 s = 0;
    int i;
    for (i = f; i < f+count; i++)
        s += buf[i];
    return ~s+1;
}

static int vp702x_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    vp702x_fe_refresh_state(st);
    deb_fe("%s\n",__func__);

    if (st->lock == 0)
        *status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
    else
        *status = 0;

    if (*status & FE_HAS_LOCK)
        st->status_check_interval = 1000;
    else
        st->status_check_interval = 250;
    return 0;
}

/* not supported by this Frontend */
static int vp702x_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    vp702x_fe_refresh_state(st);
    *ber = 0;
    return 0;
}

/* not supported by this Frontend */
static int vp702x_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    vp702x_fe_refresh_state(st);
    *unc = 0;
    return 0;
}

static int vp702x_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    vp702x_fe_refresh_state(st);

    *strength = (st->sig << 8) | st->sig;
    return 0;
}

static int vp702x_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
{
    u8 _snr;
    struct vp702x_fe_state *st = fe->demodulator_priv;
    vp702x_fe_refresh_state(st);

    _snr = (st->snr & 0x1f) * 0xff / 0x1f;
    *snr = (_snr << 8) | _snr;
    return 0;
}

static int vp702x_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
    deb_fe("%s\n",__func__);
    tune->min_delay_ms = 2000;
    return 0;
}

static int vp702x_fe_set_frontend(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
    struct vp702x_fe_state *st = fe->demodulator_priv;
    struct vp702x_device_state *dst = st->d->priv;
    u32 freq = fep->frequency/1000;
    /*CalFrequency*/
/*  u16 frequencyRef[16] = { 2, 4, 8, 16, 32, 64, 128, 256, 24, 5, 10, 20, 40, 80, 160, 320 }; */
    u64 sr;
    u8 *cmd;

    mutex_lock(&dst->buf_mutex);

    cmd = dst->buf;
    memset(cmd, 0, 10);

    cmd[0] = (freq >> 8) & 0x7f;
    cmd[1] =  freq       & 0xff;
    cmd[2] = 1; /* divrate == 4 -> frequencyRef[1] -> 1 here */

    sr = (u64) (fep->symbol_rate/1000) << 20;
    do_div(sr,88000);
    cmd[3] = (sr >> 12) & 0xff;
    cmd[4] = (sr >> 4)  & 0xff;
    cmd[5] = (sr << 4)  & 0xf0;

    deb_fe("setting frontend to: %u -> %u (%x) LNB-based GHz, symbolrate: %d -> %lu (%lx)\n",
            fep->frequency, freq, freq, fep->symbol_rate,
            (unsigned long) sr, (unsigned long) sr);

/*  if (fep->inversion == INVERSION_ON)
        cmd[6] |= 0x80; */

    if (st->voltage == SEC_VOLTAGE_18)
        cmd[6] |= 0x40;

/*  if (fep->symbol_rate > 8000000)
        cmd[6] |= 0x20;

    if (fep->frequency < 1531000)
        cmd[6] |= 0x04;

    if (st->tone_mode == SEC_TONE_ON)
        cmd[6] |= 0x01;*/

    cmd[7] = vp702x_chksum(cmd,0,7);

    st->status_check_interval = 250;
    st->next_status_check = jiffies;

    vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);

    if (cmd[2] == 0 && cmd[3] == 0)
        deb_fe("tuning failed.\n");
    else
        deb_fe("tuning succeeded.\n");

    mutex_unlock(&dst->buf_mutex);

    return 0;
}

static int vp702x_fe_init(struct dvb_frontend *fe)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    deb_fe("%s\n",__func__);
    vp702x_usb_in_op(st->d, RESET_TUNER, 0, 0, NULL, 0);
    return 0;
}

static int vp702x_fe_sleep(struct dvb_frontend *fe)
{
    deb_fe("%s\n",__func__);
    return 0;
}

static int vp702x_fe_send_diseqc_msg (struct dvb_frontend* fe,
                    struct dvb_diseqc_master_cmd *m)
{
    u8 *cmd;
    struct vp702x_fe_state *st = fe->demodulator_priv;
    struct vp702x_device_state *dst = st->d->priv;

    deb_fe("%s\n",__func__);

    if (m->msg_len > 4)
        return -EINVAL;

    mutex_lock(&dst->buf_mutex);

    cmd = dst->buf;
    cmd[1] = SET_DISEQC_CMD;
    cmd[2] = m->msg_len;
    memcpy(&cmd[3], m->msg, m->msg_len);
    cmd[7] = vp702x_chksum(cmd, 0, 7);

    vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);

    if (cmd[2] == 0 && cmd[3] == 0)
        deb_fe("diseqc cmd failed.\n");
    else
        deb_fe("diseqc cmd succeeded.\n");

    mutex_unlock(&dst->buf_mutex);

    return 0;
}

static int vp702x_fe_send_diseqc_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
{
    deb_fe("%s\n",__func__);
    return 0;
}

static int vp702x_fe_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    struct vp702x_device_state *dst = st->d->priv;
    u8 *buf;

    deb_fe("%s\n",__func__);

    st->tone_mode = tone;

    if (tone == SEC_TONE_ON)
        st->lnb_buf[2] = 0x02;
    else
        st->lnb_buf[2] = 0x00;

    st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);

    mutex_lock(&dst->buf_mutex);

    buf = dst->buf;
    memcpy(buf, st->lnb_buf, 8);

    vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
    if (buf[2] == 0 && buf[3] == 0)
        deb_fe("set_tone cmd failed.\n");
    else
        deb_fe("set_tone cmd succeeded.\n");

    mutex_unlock(&dst->buf_mutex);

    return 0;
}

static int vp702x_fe_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t
        voltage)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    struct vp702x_device_state *dst = st->d->priv;
    u8 *buf;
    deb_fe("%s\n",__func__);

    st->voltage = voltage;

    if (voltage != SEC_VOLTAGE_OFF)
        st->lnb_buf[4] = 0x01;
    else
        st->lnb_buf[4] = 0x00;

    st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);

    mutex_lock(&dst->buf_mutex);

    buf = dst->buf;
    memcpy(buf, st->lnb_buf, 8);

    vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
    if (buf[2] == 0 && buf[3] == 0)
        deb_fe("set_voltage cmd failed.\n");
    else
        deb_fe("set_voltage cmd succeeded.\n");

    mutex_unlock(&dst->buf_mutex);
    return 0;
}

static void vp702x_fe_release(struct dvb_frontend* fe)
{
    struct vp702x_fe_state *st = fe->demodulator_priv;
    kfree(st);
}

static struct dvb_frontend_ops vp702x_fe_ops;

struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d)
{
    struct vp702x_fe_state *s = kzalloc(sizeof(struct vp702x_fe_state), GFP_KERNEL);
    if (s == NULL)
        goto error;

    s->d = d;

    memcpy(&s->fe.ops,&vp702x_fe_ops,sizeof(struct dvb_frontend_ops));
    s->fe.demodulator_priv = s;

    s->lnb_buf[1] = SET_LNB_POWER;
    s->lnb_buf[3] = 0xff; /* 0=tone burst, 2=data burst, ff=off */

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


static struct dvb_frontend_ops vp702x_fe_ops = {
    .delsys = { SYS_DVBS },
    .info = {
        .name           = "Twinhan DST-like frontend (VP7021/VP7020) DVB-S",
        .frequency_min       = 950000,
        .frequency_max       = 2150000,
        .frequency_stepsize  = 1000,   /* kHz for QPSK frontends */
        .frequency_tolerance = 0,
        .symbol_rate_min     = 1000000,
        .symbol_rate_max     = 45000000,
        .symbol_rate_tolerance = 500,  /* ppm */
        .caps = 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_QPSK |
        FE_CAN_FEC_AUTO
    },
    .release = vp702x_fe_release,

    .init  = vp702x_fe_init,
    .sleep = vp702x_fe_sleep,

    .set_frontend = vp702x_fe_set_frontend,
    .get_tune_settings = vp702x_fe_get_tune_settings,

    .read_status = vp702x_fe_read_status,
    .read_ber = vp702x_fe_read_ber,
    .read_signal_strength = vp702x_fe_read_signal_strength,
    .read_snr = vp702x_fe_read_snr,
    .read_ucblocks = vp702x_fe_read_unc_blocks,

    .diseqc_send_master_cmd = vp702x_fe_send_diseqc_msg,
    .diseqc_send_burst = vp702x_fe_send_diseqc_burst,
    .set_tone = vp702x_fe_set_tone,
    .set_voltage = vp702x_fe_set_voltage,
};