indigo_express_dsp.c

  1/************************************************************************
  2
  3This file is part of Echo Digital Audio's generic driver library.
  4Copyright Echo Digital Audio Corporation (c) 1998 - 2005
  5All rights reserved
  6www.echoaudio.com
  7
  8This library is free software; you can redistribute it and/or
  9modify it under the terms of the GNU Lesser General Public
 10License as published by the Free Software Foundation; either
 11version 2.1 of the License, or (at your option) any later version.
 12
 13This library is distributed in the hope that it will be useful,
 14but WITHOUT ANY WARRANTY; without even the implied warranty of
 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16Lesser General Public License for more details.
 17
 18You should have received a copy of the GNU Lesser General Public
 19License along with this library; if not, write to the Free Software
 20Foundation, 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
 29static 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 */
 77static 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. */
101static 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
111static 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 */
119static int load_asic(struct echoaudio *chip)
120{
121	return 0;
122}