280 строки
8.1 KiB
C
280 строки
8.1 KiB
C
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
|
* Routines for control of SoundBlaster cards - MIDI interface
|
|
*
|
|
* This program 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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
|
|
*
|
|
* --
|
|
*
|
|
* Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
|
|
* Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
|
|
* working.
|
|
*
|
|
* Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
|
|
* Added full duplex UART mode for DSP version 2.0 and later.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/time.h>
|
|
#include <sound/core.h>
|
|
#include <sound/sb.h>
|
|
|
|
|
|
irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
|
|
{
|
|
struct snd_rawmidi *rmidi;
|
|
int max = 64;
|
|
char byte;
|
|
|
|
if (!chip)
|
|
return IRQ_NONE;
|
|
|
|
rmidi = chip->rmidi;
|
|
if (!rmidi) {
|
|
inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
spin_lock(&chip->midi_input_lock);
|
|
while (max-- > 0) {
|
|
if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
|
|
byte = inb(SBP(chip, READ));
|
|
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
|
|
snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&chip->midi_input_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
unsigned int valid_open_flags;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
valid_open_flags = chip->hardware >= SB_HW_20
|
|
? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
if (chip->open & ~valid_open_flags) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
chip->open |= SB_OPEN_MIDI_INPUT;
|
|
chip->midi_substream_input = substream;
|
|
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
snd_sbdsp_reset(chip); /* reset DSP */
|
|
if (chip->hardware >= SB_HW_20)
|
|
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
|
|
} else {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
unsigned int valid_open_flags;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
valid_open_flags = chip->hardware >= SB_HW_20
|
|
? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
if (chip->open & ~valid_open_flags) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
chip->open |= SB_OPEN_MIDI_OUTPUT;
|
|
chip->midi_substream_output = substream;
|
|
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
snd_sbdsp_reset(chip); /* reset DSP */
|
|
if (chip->hardware >= SB_HW_20)
|
|
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
|
|
} else {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
|
|
chip->midi_substream_input = NULL;
|
|
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
snd_sbdsp_reset(chip); /* reset DSP */
|
|
} else {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
del_timer_sync(&chip->midi_timer);
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
|
|
chip->midi_substream_output = NULL;
|
|
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
snd_sbdsp_reset(chip); /* reset DSP */
|
|
} else {
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
if (up) {
|
|
if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
|
|
if (chip->hardware < SB_HW_20)
|
|
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
|
|
chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
|
|
}
|
|
} else {
|
|
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
|
|
if (chip->hardware < SB_HW_20)
|
|
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
|
|
chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
|
|
static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
char byte;
|
|
int max = 32;
|
|
|
|
/* how big is Tx FIFO? */
|
|
chip = substream->rmidi->private_data;
|
|
while (max-- > 0) {
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
|
|
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
|
|
del_timer(&chip->midi_timer);
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
break;
|
|
}
|
|
if (chip->hardware >= SB_HW_20) {
|
|
int timeout = 8;
|
|
while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
|
|
;
|
|
if (timeout == 0) {
|
|
/* Tx FIFO full - try again later */
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
break;
|
|
}
|
|
outb(byte, SBP(chip, WRITE));
|
|
} else {
|
|
snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
|
|
snd_sbdsp_command(chip, byte);
|
|
}
|
|
snd_rawmidi_transmit_ack(substream, 1);
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
}
|
|
}
|
|
|
|
static void snd_sb8dsp_midi_output_timer(struct timer_list *t)
|
|
{
|
|
struct snd_sb *chip = from_timer(chip, t, midi_timer);
|
|
struct snd_rawmidi_substream *substream = chip->midi_substream_output;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
mod_timer(&chip->midi_timer, 1 + jiffies);
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
snd_sb8dsp_midi_output_write(substream);
|
|
}
|
|
|
|
static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_sb *chip;
|
|
|
|
chip = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&chip->open_lock, flags);
|
|
if (up) {
|
|
if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
|
|
mod_timer(&chip->midi_timer, 1 + jiffies);
|
|
chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
|
|
}
|
|
} else {
|
|
if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
|
|
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&chip->open_lock, flags);
|
|
|
|
if (up)
|
|
snd_sb8dsp_midi_output_write(substream);
|
|
}
|
|
|
|
static const struct snd_rawmidi_ops snd_sb8dsp_midi_output =
|
|
{
|
|
.open = snd_sb8dsp_midi_output_open,
|
|
.close = snd_sb8dsp_midi_output_close,
|
|
.trigger = snd_sb8dsp_midi_output_trigger,
|
|
};
|
|
|
|
static const struct snd_rawmidi_ops snd_sb8dsp_midi_input =
|
|
{
|
|
.open = snd_sb8dsp_midi_input_open,
|
|
.close = snd_sb8dsp_midi_input_close,
|
|
.trigger = snd_sb8dsp_midi_input_trigger,
|
|
};
|
|
|
|
int snd_sb8dsp_midi(struct snd_sb *chip, int device)
|
|
{
|
|
struct snd_rawmidi *rmidi;
|
|
int err;
|
|
|
|
if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
|
|
return err;
|
|
strcpy(rmidi->name, "SB8 MIDI");
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
|
|
if (chip->hardware >= SB_HW_20)
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
|
|
rmidi->private_data = chip;
|
|
timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
|
|
chip->rmidi = rmidi;
|
|
return 0;
|
|
}
|