darla20_dsp.c

// ****************************************************************************
//
//   Copyright Echo Digital Audio Corporation (c) 1998 - 2004
//   All rights reserved
//   www.echoaudio.com
//
//   This file is part of Echo Digital Audio's generic driver library.
//
//   Echo Digital Audio's generic driver library 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.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program; if not, write to the Free Software
//   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
//   MA  02111-1307, USA.
//
// ****************************************************************************
//
// Translation from C++ and adaptation for use in ALSA-Driver
// were made by Giuliano Pochini <pochini@shiny.it>
//
// ****************************************************************************


static int init_hw(echoaudio_t *chip, u16 device_id, u16 subdevice_id)
{
      int err;

      DE_INIT(("init_hw() - Darla20\n"));
      snd_assert((subdevice_id & 0xfff0) == DARLA20, return -ENODEV);

      /* This part is common to all the cards */
      if ((err = init_dsp_comm_page(chip))) {
            DE_INIT(("init_hw - could not initialize DSP comm page\n"));
            return err;
      }

      chip->device_id = device_id;
      chip->subdevice_id = subdevice_id;
      chip->bad_board = TRUE;
      chip->dsp_code_to_load = &card_fw[FW_DARLA20_DSP];
      chip->spdif_status = GD_SPDIF_STATUS_UNDEF;
      chip->clock_state = GD_CLOCK_UNDEF;
      /* Since this card has no ASIC, mark it as loaded so everything works OK */
      chip->asic_loaded = TRUE;
      chip->input_clock_types = ECHO_CLOCK_BIT_INTERNAL;

      /* Load the DSP and the ASIC on the PCI card */
      if ((err = load_firmware(chip)) < 0)
            return err;

      chip->bad_board = FALSE;

      /* Must call this here after DSP is init to init gains and mutes */
      if ((err = init_line_levels(chip)) < 0)
            return err;

      DE_INIT(("init_hw done\n"));
      return err;
}



/* The Darla20 has no external clock sources */
static u32 detect_input_clocks(const echoaudio_t *chip)
{
      return ECHO_CLOCK_BIT_INTERNAL;
}



/* The Darla20 has no ASIC. Just do nothing */
static int load_asic(echoaudio_t *chip)
{
      return 0;
}



//===========================================================================
//
// set_sample_rate
//
// Set the audio sample rate for Gina20/Darla20
//
// For Gina and Darla, three parameters need to be set: the resampler state,
// the clock state, and the S/PDIF output status state.  The idea is that
// these parameters are changed as infrequently as possible.
//
// Resampling is no longer supported.
//
//===========================================================================

static int set_sample_rate(echoaudio_t *chip, u32 rate)
{
      u8 clock_state, spdif_status;

      if (wait_handshake(chip))
            return -EIO;

      /* @@ Darla20 has no S/PDIF, can I remove spdif_status ? */
      switch (rate) {
      case 44100:
            clock_state = GD_CLOCK_44;
            spdif_status = GD_SPDIF_STATUS_44;
            break;
      case 48000:
            clock_state = GD_CLOCK_48;
            spdif_status = GD_SPDIF_STATUS_48;
            break;
      default:
            clock_state = GD_CLOCK_NOCHANGE;
            spdif_status = GD_SPDIF_STATUS_NOCHANGE;
            break;
      }

      if (chip->clock_state == clock_state)
            clock_state = GD_CLOCK_NOCHANGE;
      if (spdif_status == chip->spdif_status)
            spdif_status = GD_SPDIF_STATUS_NOCHANGE;

      /* Write the audio state to the comm page */
      chip->comm_page->sample_rate = cpu_to_le32(rate);
      chip->comm_page->gd_clock_state = clock_state;
      chip->comm_page->gd_spdif_status = spdif_status;
      chip->comm_page->gd_resampler_state = 3;  /* magic number - should always be 3 */

      /* Save the new audio state if it changed */
      if (clock_state != GD_CLOCK_NOCHANGE)
            chip->clock_state = clock_state;
      if (spdif_status != GD_SPDIF_STATUS_NOCHANGE)
            chip->spdif_status = spdif_status;
      chip->sample_rate = rate;

      /* Send command to DSP */
      clear_handshake(chip);
      return send_vector(chip, DSP_VC_SET_GD_AUDIO_STATE);
}