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/*
* sound/sb_dsp.c
*
* The low level driver for the SoundBlaster DS chips.
*
* Copyright by Hannu Savolainen 1993
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <i386/isa/sound/sound_config.h>
#if (NSND > 0) && defined(CONFIG_SB) && defined(CONFIG_MIDI)
#include <i386/isa/sound/sbcard.h>
#undef SB_TEST_IRQ
/*
* The DSP channel can be used either for input or output. Variable
* 'sb_irq_mode' will be set when the program calls read or write first time
* after open. Current version doesn't support mode changes without closing
* and reopening the device. Support for this feature may be implemented in a
* future version of this driver.
*/
extern int sb_dsp_ok; /* Set to 1 atfer successful initialization */
extern int sbc_base;
extern int sb_midi_mode;
extern int sb_midi_busy; /* 1 if the process has output to MIDI */
extern int sb_dsp_busy;
extern int sb_dsp_highspeed;
extern volatile int sb_irq_mode;
extern int sb_duplex_midi;
extern int sb_intr_active;
int input_opened = 0;
static int my_dev;
extern sound_os_info *sb_osp;
void (*midi_input_intr) (int dev, u_char data);
static int
sb_midi_open(int dev, int mode, void (*input) (int dev, u_char data),
void (*output) (int dev))
{
int ret;
if (!sb_dsp_ok) {
printf("SB Error: MIDI hardware not installed\n");
return -(ENXIO);
}
if (sb_midi_busy)
return -(EBUSY);
if (mode != OPEN_WRITE && !sb_duplex_midi) {
if (num_midis == 1)
printf("SoundBlaster: Midi input not currently supported\n");
return -(EPERM);
}
sb_midi_mode = NORMAL_MIDI;
if (mode != OPEN_WRITE) {
if (sb_dsp_busy || sb_intr_active)
return -(EBUSY);
sb_midi_mode = UART_MIDI;
}
if (sb_dsp_highspeed) {
printf("SB Error: Midi output not possible during stereo or high speed audio\n");
return -(EBUSY);
}
if (sb_midi_mode == UART_MIDI) {
sb_irq_mode = IMODE_MIDI;
sb_reset_dsp();
if (!sb_dsp_command(0x35))
return -(EIO); /* Enter the UART mode */
sb_intr_active = 1;
input_opened = 1;
midi_input_intr = input;
}
sb_midi_busy = 1;
return 0;
}
static void
sb_midi_close(int dev)
{
if (sb_midi_mode == UART_MIDI) {
sb_reset_dsp(); /* The only way to kill the UART mode */
}
sb_intr_active = 0;
sb_midi_busy = 0;
input_opened = 0;
}
static int
sb_midi_out(int dev, u_char midi_byte)
{
u_long flags;
if (sb_midi_mode == NORMAL_MIDI) {
flags = splhigh();
if (sb_dsp_command(0x38))
sb_dsp_command(midi_byte);
else
printf("SB Error: Unable to send a MIDI byte\n");
splx(flags);
} else
sb_dsp_command(midi_byte); /* UART write */
return 1;
}
static int
sb_midi_start_read(int dev)
{
if (sb_midi_mode != UART_MIDI) {
printf("SoundBlaster: MIDI input not implemented.\n");
return -(EPERM);
}
return 0;
}
static int
sb_midi_end_read(int dev)
{
if (sb_midi_mode == UART_MIDI) {
sb_reset_dsp();
sb_intr_active = 0;
}
return 0;
}
static int
sb_midi_ioctl(int dev, u_int cmd, ioctl_arg arg)
{
return -(EPERM);
}
void
sb_midi_interrupt(int dummy)
{
u_long flags;
u_char data;
flags = splhigh();
data = inb(DSP_READ);
if (input_opened)
midi_input_intr(my_dev, data);
splx(flags);
}
#define MIDI_SYNTH_NAME "SoundBlaster Midi"
#define MIDI_SYNTH_CAPS 0
#include <i386/isa/sound/midi_synth.h>
static struct midi_operations sb_midi_operations =
{
{"SoundBlaster", 0, 0, SNDCARD_SB},
&std_midi_synth,
{0},
sb_midi_open,
sb_midi_close,
sb_midi_ioctl,
sb_midi_out,
sb_midi_start_read,
sb_midi_end_read,
NULL, /* Kick */
NULL, /* command */
NULL, /* buffer_status */
NULL
};
void
sb_midi_init(int model)
{
if (num_midis >= MAX_MIDI_DEV) {
printf("Sound: Too many midi devices detected\n");
return;
}
std_midi_synth.midi_dev = num_midis;
my_dev = num_midis;
midi_devs[num_midis++] = &sb_midi_operations;
}
#endif
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