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Sourcecode: alsa-driver version File versions

darla24_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 set_nominal_level(echoaudio_t *chip, u16 index, char consumer);


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

      DE_INIT(("init_hw() - Darla24\n"));
      snd_assert((subdevice_id & 0xfff0) == DARLA24, 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_DARLA24_DSP];
      /* 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 | ECHO_CLOCK_BIT_ESYNC;

      /* 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;

      /* Set professional nominal levels. This card has no digital i/o, so analog pipes are contiguous */
      for (i = 0; i < NUM_BUSSES_OUT + NUM_BUSSES_IN; i++)
            err = set_nominal_level(chip, i, FALSE);  /* FALSE is +4dBu here */

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



//===========================================================================
//
// detect_input_clocks returns a bitmask consisting of all the input
// clocks currently connected to the hardware; this changes as the user
// connects and disconnects clock inputs.
//
// You should use this information to determine which clocks the user is
// allowed to select.
//
// Darla24 only supports Esync input clock.
//
//===========================================================================

static u32 detect_input_clocks(const echoaudio_t *chip)
{
      u32 clocks_from_dsp, clock_bits;

      /* Map the DSP clock detect bits to the generic driver clock detect bits */
      clocks_from_dsp = le32_to_cpu(chip->comm_page->status_clocks);

      clock_bits = ECHO_CLOCK_BIT_INTERNAL;

      if (clocks_from_dsp & GLDM_CLOCK_DETECT_BIT_ESYNC)
            clock_bits |= ECHO_CLOCK_BIT_ESYNC;

      return clock_bits;
}



/* The Darla24 has no ASIC. Just do nothing */
static int load_asic(echoaudio_t *chip)
{
      return 0;
}



//===========================================================================
//
// set_sample_rate
//
// Set the audio sample rate for Darla24; this is fairly simple.  You
// just pick the right magic number.
//
//===========================================================================

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

      /* Pick the magic number */
      switch (rate) {
      case 96000:
            clock = GD24_96000;
            break;
      case 88200:
            clock = GD24_88200;
            break;
      case 48000:
            clock = GD24_48000;
            break;
      case 44100:
            clock = GD24_44100;
            break;
      case 32000:
            clock = GD24_32000;
            break;
      case 22050:
            clock = GD24_22050;
            break;
      case 16000:
            clock = GD24_16000;
            break;
      case 11025:
            clock = GD24_11025;
            break;
      case 8000:
            clock = GD24_8000;
            break;
      default:
            DE_ACT(("set_sample_rate: Error, invalid sample rate %d\n", rate));
            return -EINVAL;
      }

      if (wait_handshake(chip))
            return -EIO;

      DE_ACT(("set_sample_rate: %d clock %d\n", rate, clock));
      chip->sample_rate = rate;

      /* Override the sample rate if this card is set to Echo sync. */
      if (chip->input_clock == ECHO_CLOCK_ESYNC)
            clock = GD24_EXT_SYNC;

      chip->comm_page->sample_rate = cpu_to_le32(rate);     /* ignored by the DSP ? */
      chip->comm_page->gd_clock_state = clock;
      clear_handshake(chip);
      return send_vector(chip, DSP_VC_SET_GD_AUDIO_STATE);
}



//===========================================================================
//
// Set input clock
//
// Darla24 supports internal and Esync clock.
//
//===========================================================================

static int set_input_clock(echoaudio_t *chip, u16 clock)
{
      snd_assert(clock == ECHO_CLOCK_INTERNAL || clock == ECHO_CLOCK_ESYNC, return -EINVAL);
      chip->input_clock = clock;
      return set_sample_rate(chip, chip->sample_rate);
}


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