286 lines
5.7 KiB
C
286 lines
5.7 KiB
C
/*
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* sound/pas2_midi.c
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*
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* The low level driver for the PAS Midi Interface.
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <i386/isa/sound/sound_config.h>
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#if defined(CONFIG_PAS) && defined(CONFIG_MIDI)
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#include <i386/isa/sound/pas_hw.h>
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static int midi_busy = 0, input_opened = 0;
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static int my_dev;
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static volatile int ofifo_bytes = 0;
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static u_char tmp_queue[256];
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static volatile int qlen;
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static volatile u_char qhead, qtail;
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static void (*midi_input_intr) (int dev, u_char data);
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static int
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pas_midi_open(int dev, int mode,
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void (*input) (int dev, u_char data),
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void (*output) (int dev)
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)
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{
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int err;
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u_long flags;
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u_char ctrl;
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if (midi_busy) {
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printf("PAS2: Midi busy\n");
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return -(EBUSY);
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}
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/*
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* Reset input and output FIFO pointers
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*/
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pas_write(M_C_RESET_INPUT_FIFO | M_C_RESET_OUTPUT_FIFO,
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MIDI_CONTROL);
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flags = splhigh();
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if ((err = pas_set_intr(I_M_MIDI_IRQ_ENABLE)) < 0)
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return err;
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/*
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* Enable input available and output FIFO empty interrupts
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*/
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ctrl = 0;
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input_opened = 0;
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midi_input_intr = input;
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if (mode == OPEN_READ || mode == OPEN_READWRITE) {
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ctrl |= M_C_ENA_INPUT_IRQ; /* Enable input */
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input_opened = 1;
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}
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if (mode == OPEN_WRITE || mode == OPEN_READWRITE) {
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ctrl |= M_C_ENA_OUTPUT_IRQ | /* Enable output */
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M_C_ENA_OUTPUT_HALF_IRQ;
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}
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pas_write(ctrl,
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MIDI_CONTROL);
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/*
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* Acknowledge any pending interrupts
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*/
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pas_write(0xff, MIDI_STATUS);
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ofifo_bytes = 0;
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splx(flags);
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midi_busy = 1;
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qlen = qhead = qtail = 0;
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return 0;
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}
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static void
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pas_midi_close(int dev)
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{
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/*
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* Reset FIFO pointers, disable intrs
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*/
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pas_write(M_C_RESET_INPUT_FIFO | M_C_RESET_OUTPUT_FIFO, MIDI_CONTROL);
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pas_remove_intr(I_M_MIDI_IRQ_ENABLE);
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midi_busy = 0;
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}
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static int
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dump_to_midi(u_char midi_byte)
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{
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int fifo_space, x;
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fifo_space = ((x = pas_read(MIDI_FIFO_STATUS)) >> 4) & 0x0f;
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if (fifo_space == 15 || (fifo_space < 2 && ofifo_bytes > 13)) { /* Fifo full */
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return 0; /* Upper layer will call again */
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}
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ofifo_bytes++;
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pas_write(midi_byte, MIDI_DATA);
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return 1;
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}
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static int
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pas_midi_out(int dev, u_char midi_byte)
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{
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u_long flags;
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/*
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* Drain the local queue first
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*/
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flags = splhigh();
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while (qlen && dump_to_midi(tmp_queue[qhead])) {
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qlen--;
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qhead++;
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}
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splx(flags);
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/*
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* Output the byte if the local queue is empty.
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*/
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if (!qlen)
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if (dump_to_midi(midi_byte))
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return 1; /* OK */
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/*
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* Put to the local queue
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*/
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if (qlen >= 256)
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return 0; /* Local queue full */
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flags = splhigh();
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tmp_queue[qtail] = midi_byte;
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qlen++;
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qtail++;
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splx(flags);
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return 1;
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}
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static int
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pas_midi_start_read(int dev)
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{
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return 0;
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}
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static int
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pas_midi_end_read(int dev)
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{
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return 0;
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}
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static int
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pas_midi_ioctl(int dev, u_int cmd, ioctl_arg arg)
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{
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return -(EINVAL);
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}
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static void
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pas_midi_kick(int dev)
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{
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ofifo_bytes = 0;
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}
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static int
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pas_buffer_status(int dev)
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{
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return qlen;
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}
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#define MIDI_SYNTH_NAME "Pro Audio Spectrum Midi"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include <i386/isa/sound/midi_synth.h>
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static struct midi_operations pas_midi_operations =
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{
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{"Pro Audio Spectrum", 0, 0, SNDCARD_PAS},
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&std_midi_synth,
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{0},
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pas_midi_open,
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pas_midi_close,
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pas_midi_ioctl,
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pas_midi_out,
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pas_midi_start_read,
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pas_midi_end_read,
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pas_midi_kick,
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NULL, /* command */
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pas_buffer_status,
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NULL
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};
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void
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pas_midi_init()
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{
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if (num_midis >= MAX_MIDI_DEV) {
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printf("Sound: Too many midi devices detected\n");
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return;
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}
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std_midi_synth.midi_dev = my_dev = num_midis;
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midi_devs[num_midis++] = &pas_midi_operations;
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return;
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}
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void
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pas_midi_interrupt(void)
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{
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u_char stat;
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int i, incount;
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u_long flags;
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stat = pas_read(MIDI_STATUS);
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if (stat & M_S_INPUT_AVAIL) { /* Input byte available */
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incount = pas_read(MIDI_FIFO_STATUS) & 0x0f; /* Input FIFO count */
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if (!incount)
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incount = 16;
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for (i = 0; i < incount; i++)
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if (input_opened) {
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midi_input_intr(my_dev, pas_read(MIDI_DATA));
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} else
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pas_read(MIDI_DATA); /* Flush */
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}
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if (stat & (M_S_OUTPUT_EMPTY | M_S_OUTPUT_HALF_EMPTY)) {
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if (!(stat & M_S_OUTPUT_EMPTY)) {
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ofifo_bytes = 8;
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} else {
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ofifo_bytes = 0;
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}
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flags = splhigh();
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while (qlen && dump_to_midi(tmp_queue[qhead])) {
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qlen--;
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qhead++;
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}
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splx(flags);
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}
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if (stat & M_S_OUTPUT_OVERRUN) {
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printf("MIDI output overrun %x,%x,%d \n", pas_read(MIDI_FIFO_STATUS), stat, ofifo_bytes);
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ofifo_bytes = 100;
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}
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pas_write(stat, MIDI_STATUS); /* Acknowledge interrupts */
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}
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#endif
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