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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 "sound_config.h"
#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_SB) && !defined(EXCLUDE_MIDI)
#include "sb.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 after 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;
void (*midi_input_intr) (int dev, unsigned char data);
static int
sb_midi_open (int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
int ret;
if (!sb_dsp_ok)
{
printk ("SB Error: MIDI hardware not installed\n");
return RET_ERROR (ENXIO);
}
if (sb_midi_busy)
return RET_ERROR (EBUSY);
if (mode != OPEN_WRITE && !sb_duplex_midi)
{
if (num_midis == 1)
printk ("SoundBlaster: Midi input not currently supported\n");
return RET_ERROR (EPERM);
}
sb_midi_mode = NORMAL_MIDI;
if (mode != OPEN_WRITE)
{
if (sb_dsp_busy || sb_intr_active)
return RET_ERROR (EBUSY);
sb_midi_mode = UART_MIDI;
}
if (sb_dsp_highspeed)
{
printk ("SB Error: Midi output not possible during stereo or high speed audio\n");
return RET_ERROR (EBUSY);
}
if (sb_midi_mode == UART_MIDI)
{
sb_irq_mode = IMODE_MIDI;
sb_reset_dsp ();
if (!sb_dsp_command (0x35))
return RET_ERROR (EIO); /*
* Enter the UART mode
*/
sb_intr_active = 1;
if ((ret = sb_get_irq ()) < 0)
{
sb_reset_dsp ();
return 0; /*
* IRQ not free
*/
}
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_free_irq ();
}
sb_intr_active = 0;
sb_midi_busy = 0;
input_opened = 0;
}
static int
sb_midi_out (int dev, unsigned char midi_byte)
{
unsigned long flags;
if (sb_midi_mode == NORMAL_MIDI)
{
DISABLE_INTR (flags);
if (sb_dsp_command (0x38))
sb_dsp_command (midi_byte);
else
printk ("SB Error: Unable to send a MIDI byte\n");
RESTORE_INTR (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)
{
printk ("SoundBlaster: MIDI input not implemented.\n");
return RET_ERROR (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, unsigned cmd, unsigned arg)
{
return RET_ERROR (EPERM);
}
void
sb_midi_interrupt (int dummy)
{
unsigned long flags;
unsigned char data;
DISABLE_INTR (flags);
data = INB (DSP_READ);
if (input_opened)
midi_input_intr (my_dev, data);
RESTORE_INTR (flags);
}
#define MIDI_SYNTH_NAME "SoundBlaster Midi"
#define MIDI_SYNTH_CAPS 0
#include "midi_synth.h"
static struct midi_operations sb_midi_operations =
{
{"SoundBlaster", 0, 0, SNDCARD_SB},
&std_midi_synth,
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)
{
printk ("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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