root/sound/pci/echoaudio/indigo_express_dsp.c

DEFINITIONS

1. set_sample_rate
2. set_vmixer_gain
3. update_vmixer_level
4. detect_input_clocks
5. load_asic

   1 /************************************************************************
   2 
   3 This file is part of Echo Digital Audio's generic driver library.
   4 Copyright Echo Digital Audio Corporation (c) 1998 - 2005
   5 All rights reserved
   6 www.echoaudio.com
   7 
   8 This library is free software; you can redistribute it and/or
   9 modify it under the terms of the GNU Lesser General Public
  10 License as published by the Free Software Foundation; either
  11 version 2.1 of the License, or (at your option) any later version.
  12 
  13 This library is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 Lesser General Public License for more details.
  17 
  18 You should have received a copy of the GNU Lesser General Public
  19 License along with this library; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21 
  22 *************************************************************************
  23 
  24  Translation from C++ and adaptation for use in ALSA-Driver
  25  were made by Giuliano Pochini <pochini@shiny.it>
  26 
  27 *************************************************************************/
  28 
  29 static int set_sample_rate(struct echoaudio *chip, u32 rate)
  30 {
  31         u32 clock, control_reg, old_control_reg;
  32 
  33         if (wait_handshake(chip))
  34                 return -EIO;
  35 
  36         old_control_reg = le32_to_cpu(chip->comm_page->control_register);
  37         control_reg = old_control_reg & ~INDIGO_EXPRESS_CLOCK_MASK;
  38 
  39         switch (rate) {
  40         case 32000:
  41                 clock = INDIGO_EXPRESS_32000;
  42                 break;
  43         case 44100:
  44                 clock = INDIGO_EXPRESS_44100;
  45                 break;
  46         case 48000:
  47                 clock = INDIGO_EXPRESS_48000;
  48                 break;
  49         case 64000:
  50                 clock = INDIGO_EXPRESS_32000|INDIGO_EXPRESS_DOUBLE_SPEED;
  51                 break;
  52         case 88200:
  53                 clock = INDIGO_EXPRESS_44100|INDIGO_EXPRESS_DOUBLE_SPEED;
  54                 break;
  55         case 96000:
  56                 clock = INDIGO_EXPRESS_48000|INDIGO_EXPRESS_DOUBLE_SPEED;
  57                 break;
  58         default:
  59                 return -EINVAL;
  60         }
  61 
  62         control_reg |= clock;
  63         if (control_reg != old_control_reg) {
  64                 dev_dbg(chip->card->dev,
  65                         "set_sample_rate: %d clock %d\n", rate, clock);
  66                 chip->comm_page->control_register = cpu_to_le32(control_reg);
  67                 chip->sample_rate = rate;
  68                 clear_handshake(chip);
  69                 return send_vector(chip, DSP_VC_UPDATE_CLOCKS);
  70         }
  71         return 0;
  72 }
  73 
  74 
  75 
  76 /* This function routes the sound from a virtual channel to a real output */
  77 static int set_vmixer_gain(struct echoaudio *chip, u16 output, u16 pipe,
  78                            int gain)
  79 {
  80         int index;
  81 
  82         if (snd_BUG_ON(pipe >= num_pipes_out(chip) ||
  83                        output >= num_busses_out(chip)))
  84                 return -EINVAL;
  85 
  86         if (wait_handshake(chip))
  87                 return -EIO;
  88 
  89         chip->vmixer_gain[output][pipe] = gain;
  90         index = output * num_pipes_out(chip) + pipe;
  91         chip->comm_page->vmixer[index] = gain;
  92 
  93         dev_dbg(chip->card->dev,
  94                 "set_vmixer_gain: pipe %d, out %d = %d\n", pipe, output, gain);
  95         return 0;
  96 }
  97 
  98 
  99 
 100 /* Tell the DSP to read and update virtual mixer levels in comm page. */
 101 static int update_vmixer_level(struct echoaudio *chip)
 102 {
 103         if (wait_handshake(chip))
 104                 return -EIO;
 105         clear_handshake(chip);
 106         return send_vector(chip, DSP_VC_SET_VMIXER_GAIN);
 107 }
 108 
 109 
 110 
 111 static u32 detect_input_clocks(const struct echoaudio *chip)
 112 {
 113         return ECHO_CLOCK_BIT_INTERNAL;
 114 }
 115 
 116 
 117 
 118 /* The IndigoIO has no ASIC. Just do nothing */
 119 static int load_asic(struct echoaudio *chip)
 120 {
 121         return 0;
 122 }