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dtt200u-fe.c

/* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
 * Typhoon/ Yuan DVB-T USB2.0 receiver.
 *
 * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@desy.de>
 *
 *    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 dvb_frontend_parameters 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 dvb_frontend_parameters *fep)
{
      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->u.ofdm.bandwidth) {
            case BANDWIDTH_8_MHZ: bwbuf[1] = 8; break;
            case BANDWIDTH_7_MHZ: bwbuf[1] = 7; break;
            case BANDWIDTH_6_MHZ: bwbuf[1] = 6; break;
            case BANDWIDTH_AUTO: return -EOPNOTSUPP;
            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 dvb_frontend_parameters *fep)
{
      struct dtt200u_fe_state *state = fe->demodulator_priv;
      memcpy(fep,&state->fep,sizeof(struct dvb_frontend_parameters));
      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 = {
      .info = {
            .name             = "WideView USB DVB-T",
            .type             = FE_OFDM,
            .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,
};

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