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gina20_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_professional_spdif(echoaudio_t *chip, char prof);
static int update_flags(echoaudio_t *chip);


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

      DE_INIT(("init_hw() - Gina20\n"));
      snd_assert((subdevice_id & 0xfff0) == GINA20, 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_GINA20_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 | ECHO_CLOCK_BIT_SPDIF;

      /* 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 the S/PDIF output format to "professional" */
      err = set_professional_spdif(chip, TRUE);

      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.
//
// Gina20 only supports S/PDIF 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_SPDIF)
            clock_bits |= ECHO_CLOCK_BIT_SPDIF;

      return clock_bits;
}



/* The Gina20 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;

      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);
}



//===========================================================================
//
// Set the input clock to internal, S/PDIF, ADAT
//
//===========================================================================

static int set_input_clock(echoaudio_t *chip, u16 clock)
{
      DE_ACT(("set_input_clock:\n"));

      switch (clock) {
      case ECHO_CLOCK_INTERNAL:
            /* Reset the audio state to unknown (just in case) */
            chip->clock_state = GD_CLOCK_UNDEF;
            chip->spdif_status = GD_SPDIF_STATUS_UNDEF;
            set_sample_rate(chip, chip->sample_rate);
            chip->input_clock = clock;
            DE_ACT(("Set Gina clock to INTERNAL\n"));
            break;
      case ECHO_CLOCK_SPDIF:
            chip->comm_page->gd_clock_state = GD_CLOCK_SPDIFIN;
            chip->comm_page->gd_spdif_status = GD_SPDIF_STATUS_NOCHANGE;
            clear_handshake(chip);
            send_vector(chip, DSP_VC_SET_GD_AUDIO_STATE);
            chip->clock_state = GD_CLOCK_SPDIFIN;
            DE_ACT(("Set Gina20 clock to SPDIF\n"));
            chip->input_clock = clock;
            break;
      default:
            return -EINVAL;
      }

      return 0;
}



/* Set input bus gain (one unit is 0.5dB !)
   where ECHOGAIN_MININP <= gain <= ECHOGAIN_MAXINP) */
static int set_input_gain(echoaudio_t *chip, u16 input, int gain)
{
      snd_assert(input < num_busses_in(chip), return -EINVAL);

      if (wait_handshake(chip))
            return -EIO;

      /* Save the new value */
      chip->input_gain[input] = gain;
      gain += GL20_INPUT_GAIN_MAGIC_NUMBER;
      chip->comm_page->line_in_level[input] = gain;
      return 0;
}



/* Tell the DSP to reread the flags from the comm page */
static int update_flags(echoaudio_t *chip)
{
      if (wait_handshake(chip))
            return -EIO;
      clear_handshake(chip);
      return send_vector(chip, DSP_VC_UPDATE_FLAGS);
}



static int set_professional_spdif(echoaudio_t *chip, char prof)
{
      DE_ACT(("set_professional_spdif %d\n", prof));
      if (prof)
            chip->comm_page->flags |= __constant_cpu_to_le32(DSP_FLAG_PROFESSIONAL_SPDIF);
      else
            chip->comm_page->flags &= ~__constant_cpu_to_le32(DSP_FLAG_PROFESSIONAL_SPDIF);
      chip->professional_spdif = prof;
      return update_flags(chip);
}

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