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gp8psk-fe.c

/* DVB USB compliant Linux driver for the
 *  - GENPIX 8pks/qpsk/DCII USB2.0 DVB-S module
 *
 * Copyright (C) 2006,2007 Alan Nisota (alannisota@gmail.com)
 * Copyright (C) 2006,2007 Genpix Electronics (genpix@genpix-electronics.com)
 *
 * Thanks to GENPIX for the sample code used to implement this module.
 *
 * This module is based off the vp7045 and vp702x modules
 *
 *    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 "gp8psk.h"

struct gp8psk_fe_state {
      struct dvb_frontend fe;
      struct dvb_usb_device *d;
      u8 lock;
      u16 snr;
      unsigned long next_status_check;
      unsigned long status_check_interval;
};

static int gp8psk_fe_update_status(struct gp8psk_fe_state *st)
{
      u8 buf[6];
      if (time_after(jiffies,st->next_status_check)) {
            gp8psk_usb_in_op(st->d, GET_SIGNAL_LOCK, 0,0,&st->lock,1);
            gp8psk_usb_in_op(st->d, GET_SIGNAL_STRENGTH, 0,0,buf,6);
            st->snr = (buf[1]) << 8 | buf[0];
            st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
      }
      return 0;
}

static int gp8psk_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
{
      struct gp8psk_fe_state *st = fe->demodulator_priv;
      gp8psk_fe_update_status(st);

      if (st->lock)
            *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 = 100;
      return 0;
}

/* not supported by this Frontend */
static int gp8psk_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
{
      (void) fe;
      *ber = 0;
      return 0;
}

/* not supported by this Frontend */
static int gp8psk_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
      (void) fe;
      *unc = 0;
      return 0;
}

static int gp8psk_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
{
      struct gp8psk_fe_state *st = fe->demodulator_priv;
      gp8psk_fe_update_status(st);
      /* snr is reported in dBu*256 */
      *snr = st->snr;
      return 0;
}

static int gp8psk_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
      struct gp8psk_fe_state *st = fe->demodulator_priv;
      gp8psk_fe_update_status(st);
      /* snr is reported in dBu*256 */
      /* snr / 38.4 ~= 100% strength */
      /* snr * 17 returns 100% strength as 65535 */
      if (st->snr > 0xf00)
            *strength = 0xffff;
      else
            *strength = (st->snr << 4) + st->snr; /* snr*17 */
      return 0;
}

static int gp8psk_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
      tune->min_delay_ms = 200;
      return 0;
}

static int gp8psk_fe_set_frontend(struct dvb_frontend* fe,
                          struct dvb_frontend_parameters *fep)
{
      struct gp8psk_fe_state *state = fe->demodulator_priv;
      u8 cmd[10];
      u32 freq = fep->frequency * 1000;

      cmd[4] = freq         & 0xff;
      cmd[5] = (freq >> 8)  & 0xff;
      cmd[6] = (freq >> 16) & 0xff;
      cmd[7] = (freq >> 24) & 0xff;

      switch(fe->ops.info.type) {
      case FE_QPSK:
            cmd[0] =  fep->u.qpsk.symbol_rate        & 0xff;
            cmd[1] = (fep->u.qpsk.symbol_rate >>  8) & 0xff;
            cmd[2] = (fep->u.qpsk.symbol_rate >> 16) & 0xff;
            cmd[3] = (fep->u.qpsk.symbol_rate >> 24) & 0xff;
            cmd[8] = ADV_MOD_DVB_QPSK;
            cmd[9] = 0x03; /*ADV_MOD_FEC_XXX*/
            break;
      default:
            // other modes are unsuported right now
            cmd[0] = 0;
            cmd[1] = 0;
            cmd[2] = 0;
            cmd[3] = 0;
            cmd[8] = 0;
            cmd[9] = 0;
            break;
      }

      gp8psk_usb_out_op(state->d,TUNE_8PSK,0,0,cmd,10);

      state->lock = 0;
      state->next_status_check = jiffies;
      state->status_check_interval = 200;

      return 0;
}

static int gp8psk_fe_get_frontend(struct dvb_frontend* fe,
                          struct dvb_frontend_parameters *fep)
{
      return 0;
}


static int gp8psk_fe_send_diseqc_msg (struct dvb_frontend* fe,
                            struct dvb_diseqc_master_cmd *m)
{
      struct gp8psk_fe_state *st = fe->demodulator_priv;

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

      if (gp8psk_usb_out_op(st->d,SEND_DISEQC_COMMAND, m->msg[0], 0,
                  m->msg, m->msg_len)) {
            return -EINVAL;
      }
      return 0;
}

static int gp8psk_fe_send_diseqc_burst (struct dvb_frontend* fe,
                            fe_sec_mini_cmd_t burst)
{
      struct gp8psk_fe_state *st = fe->demodulator_priv;
      u8 cmd;

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

      /* These commands are certainly wrong */
      cmd = (burst == SEC_MINI_A) ? 0x00 : 0x01;

      if (gp8psk_usb_out_op(st->d,SEND_DISEQC_COMMAND, cmd, 0,
                  &cmd, 0)) {
            return -EINVAL;
      }
      return 0;
}

static int gp8psk_fe_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
      struct gp8psk_fe_state* state = fe->demodulator_priv;

      if (gp8psk_usb_out_op(state->d,SET_22KHZ_TONE,
             (tone == SEC_TONE_ON), 0, NULL, 0)) {
            return -EINVAL;
      }
      return 0;
}

static int gp8psk_fe_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
{
      struct gp8psk_fe_state* state = fe->demodulator_priv;

      if (gp8psk_usb_out_op(state->d,SET_LNB_VOLTAGE,
                   voltage == SEC_VOLTAGE_18, 0, NULL, 0)) {
            return -EINVAL;
      }
      return 0;
}

static int gp8psk_fe_enable_high_lnb_voltage(struct dvb_frontend* fe, long onoff)
{
      struct gp8psk_fe_state* state = fe->demodulator_priv;
      return gp8psk_usb_out_op(state->d, USE_EXTRA_VOLT, onoff, 0,NULL,0);
}

static int gp8psk_fe_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long sw_cmd)
{
      struct gp8psk_fe_state* state = fe->demodulator_priv;
      u8 cmd = sw_cmd & 0x7f;

      if (gp8psk_usb_out_op(state->d,SET_DN_SWITCH, cmd, 0,
                  NULL, 0)) {
            return -EINVAL;
      }
      if (gp8psk_usb_out_op(state->d,SET_LNB_VOLTAGE, !!(sw_cmd & 0x80),
                  0, NULL, 0)) {
            return -EINVAL;
      }

      return 0;
}

static void gp8psk_fe_release(struct dvb_frontend* fe)
{
      struct gp8psk_fe_state *state = fe->demodulator_priv;
      kfree(state);
}

static struct dvb_frontend_ops gp8psk_fe_ops;

struct dvb_frontend * gp8psk_fe_attach(struct dvb_usb_device *d)
{
      struct gp8psk_fe_state *s = kzalloc(sizeof(struct gp8psk_fe_state), GFP_KERNEL);
      if (s == NULL)
            goto error;

      s->d = d;
      memcpy(&s->fe.ops, &gp8psk_fe_ops, sizeof(struct dvb_frontend_ops));
      s->fe.demodulator_priv = s;

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


static struct dvb_frontend_ops gp8psk_fe_ops = {
      .info = {
            .name             = "Genpix 8psk-to-USB2 DVB-S",
            .type             = FE_QPSK,
            .frequency_min          = 800000,
            .frequency_max          = 2250000,
            .frequency_stepsize     = 100,
            .symbol_rate_min        = 1000000,
            .symbol_rate_max        = 45000000,
            .symbol_rate_tolerance  = 500,  /* ppm */
            .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
      },

      .release = gp8psk_fe_release,

      .init = NULL,
      .sleep = NULL,

      .set_frontend = gp8psk_fe_set_frontend,
      .get_frontend = gp8psk_fe_get_frontend,
      .get_tune_settings = gp8psk_fe_get_tune_settings,

      .read_status = gp8psk_fe_read_status,
      .read_ber = gp8psk_fe_read_ber,
      .read_signal_strength = gp8psk_fe_read_signal_strength,
      .read_snr = gp8psk_fe_read_snr,
      .read_ucblocks = gp8psk_fe_read_unc_blocks,

      .diseqc_send_master_cmd = gp8psk_fe_send_diseqc_msg,
      .diseqc_send_burst = gp8psk_fe_send_diseqc_burst,
      .set_tone = gp8psk_fe_set_tone,
      .set_voltage = gp8psk_fe_set_voltage,
      .dishnetwork_send_legacy_command = gp8psk_fe_send_legacy_dish_cmd,
      .enable_high_lnb_voltage = gp8psk_fe_enable_high_lnb_voltage
};

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