280 lines
8.1 KiB
C
280 lines
8.1 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Routines for control of SoundBlaster cards - MIDI interface
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* --
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*
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* Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
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* Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
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* working.
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*
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* Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
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* Added full duplex UART mode for DSP version 2.0 and later.
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*/
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#include <linux/io.h>
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/sb.h>
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irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
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{
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struct snd_rawmidi *rmidi;
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int max = 64;
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char byte;
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if (!chip)
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return IRQ_NONE;
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rmidi = chip->rmidi;
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if (!rmidi) {
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inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
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return IRQ_NONE;
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}
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spin_lock(&chip->midi_input_lock);
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while (max-- > 0) {
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if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
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byte = inb(SBP(chip, READ));
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if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
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snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
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}
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}
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}
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spin_unlock(&chip->midi_input_lock);
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return IRQ_HANDLED;
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}
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static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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struct snd_sb *chip;
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unsigned int valid_open_flags;
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chip = substream->rmidi->private_data;
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valid_open_flags = chip->hardware >= SB_HW_20
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? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
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spin_lock_irqsave(&chip->open_lock, flags);
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if (chip->open & ~valid_open_flags) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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return -EAGAIN;
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}
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chip->open |= SB_OPEN_MIDI_INPUT;
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chip->midi_substream_input = substream;
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if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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snd_sbdsp_reset(chip); /* reset DSP */
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if (chip->hardware >= SB_HW_20)
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snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
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} else {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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return 0;
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}
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static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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struct snd_sb *chip;
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unsigned int valid_open_flags;
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chip = substream->rmidi->private_data;
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valid_open_flags = chip->hardware >= SB_HW_20
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? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
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spin_lock_irqsave(&chip->open_lock, flags);
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if (chip->open & ~valid_open_flags) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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return -EAGAIN;
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}
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chip->open |= SB_OPEN_MIDI_OUTPUT;
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chip->midi_substream_output = substream;
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if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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snd_sbdsp_reset(chip); /* reset DSP */
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if (chip->hardware >= SB_HW_20)
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snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
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} else {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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return 0;
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}
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static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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struct snd_sb *chip;
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chip = substream->rmidi->private_data;
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spin_lock_irqsave(&chip->open_lock, flags);
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chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
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chip->midi_substream_input = NULL;
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if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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snd_sbdsp_reset(chip); /* reset DSP */
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} else {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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return 0;
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}
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static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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struct snd_sb *chip;
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chip = substream->rmidi->private_data;
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del_timer_sync(&chip->midi_timer);
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spin_lock_irqsave(&chip->open_lock, flags);
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chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
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chip->midi_substream_output = NULL;
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if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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snd_sbdsp_reset(chip); /* reset DSP */
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} else {
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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return 0;
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}
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static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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unsigned long flags;
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struct snd_sb *chip;
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chip = substream->rmidi->private_data;
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spin_lock_irqsave(&chip->open_lock, flags);
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if (up) {
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if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
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if (chip->hardware < SB_HW_20)
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snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
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chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
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}
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} else {
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if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
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if (chip->hardware < SB_HW_20)
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snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
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chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
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}
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}
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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struct snd_sb *chip;
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char byte;
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int max = 32;
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/* how big is Tx FIFO? */
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chip = substream->rmidi->private_data;
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while (max-- > 0) {
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spin_lock_irqsave(&chip->open_lock, flags);
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if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
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chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
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del_timer(&chip->midi_timer);
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spin_unlock_irqrestore(&chip->open_lock, flags);
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break;
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}
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if (chip->hardware >= SB_HW_20) {
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int timeout = 8;
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while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
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;
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if (timeout == 0) {
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/* Tx FIFO full - try again later */
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spin_unlock_irqrestore(&chip->open_lock, flags);
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break;
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}
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outb(byte, SBP(chip, WRITE));
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} else {
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snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
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snd_sbdsp_command(chip, byte);
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}
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snd_rawmidi_transmit_ack(substream, 1);
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spin_unlock_irqrestore(&chip->open_lock, flags);
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}
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}
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static void snd_sb8dsp_midi_output_timer(struct timer_list *t)
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{
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struct snd_sb *chip = from_timer(chip, t, midi_timer);
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struct snd_rawmidi_substream *substream = chip->midi_substream_output;
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unsigned long flags;
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spin_lock_irqsave(&chip->open_lock, flags);
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mod_timer(&chip->midi_timer, 1 + jiffies);
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spin_unlock_irqrestore(&chip->open_lock, flags);
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snd_sb8dsp_midi_output_write(substream);
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}
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static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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unsigned long flags;
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struct snd_sb *chip;
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chip = substream->rmidi->private_data;
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spin_lock_irqsave(&chip->open_lock, flags);
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if (up) {
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if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
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mod_timer(&chip->midi_timer, 1 + jiffies);
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chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
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}
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} else {
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if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
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chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
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}
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}
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spin_unlock_irqrestore(&chip->open_lock, flags);
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if (up)
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snd_sb8dsp_midi_output_write(substream);
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}
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static const struct snd_rawmidi_ops snd_sb8dsp_midi_output =
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{
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.open = snd_sb8dsp_midi_output_open,
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.close = snd_sb8dsp_midi_output_close,
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.trigger = snd_sb8dsp_midi_output_trigger,
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};
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static const struct snd_rawmidi_ops snd_sb8dsp_midi_input =
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{
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.open = snd_sb8dsp_midi_input_open,
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.close = snd_sb8dsp_midi_input_close,
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.trigger = snd_sb8dsp_midi_input_trigger,
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};
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int snd_sb8dsp_midi(struct snd_sb *chip, int device)
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{
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struct snd_rawmidi *rmidi;
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int err;
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if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
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return err;
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strcpy(rmidi->name, "SB8 MIDI");
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
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if (chip->hardware >= SB_HW_20)
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
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rmidi->private_data = chip;
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timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
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chip->rmidi = rmidi;
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return 0;
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}
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