+++ /dev/null
-/*
- * sound/oss/pas2_midi.c
- *
- * The low level driver for the PAS Midi Interface.
- */
-/*
- * Copyright (C) by Hannu Savolainen 1993-1997
- *
- * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
- * Version 2 (June 1991). See the "COPYING" file distributed with this software
- * for more info.
- *
- * Bartlomiej Zolnierkiewicz : Added __init to pas_init_mixer()
- */
-
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include "sound_config.h"
-
-#include "pas2.h"
-
-extern spinlock_t pas_lock;
-
-static int midi_busy, input_opened;
-static int my_dev;
-
-int pas2_mididev=-1;
-
-static unsigned char tmp_queue[256];
-static volatile int qlen;
-static volatile unsigned char qhead, qtail;
-
-static void (*midi_input_intr) (int dev, unsigned char data);
-
-static int pas_midi_open(int dev, int mode,
- void (*input) (int dev, unsigned char data),
- void (*output) (int dev)
-)
-{
- int err;
- unsigned long flags;
- unsigned char ctrl;
-
-
- if (midi_busy)
- return -EBUSY;
-
- /*
- * Reset input and output FIFO pointers
- */
- pas_write(0x20 | 0x40,
- 0x178b);
-
- spin_lock_irqsave(&pas_lock, flags);
-
- if ((err = pas_set_intr(0x10)) < 0)
- {
- spin_unlock_irqrestore(&pas_lock, flags);
- return err;
- }
- /*
- * Enable input available and output FIFO empty interrupts
- */
-
- ctrl = 0;
- input_opened = 0;
- midi_input_intr = input;
-
- if (mode == OPEN_READ || mode == OPEN_READWRITE)
- {
- ctrl |= 0x04; /* Enable input */
- input_opened = 1;
- }
- if (mode == OPEN_WRITE || mode == OPEN_READWRITE)
- {
- ctrl |= 0x08 | 0x10; /* Enable output */
- }
- pas_write(ctrl, 0x178b);
-
- /*
- * Acknowledge any pending interrupts
- */
-
- pas_write(0xff, 0x1B88);
-
- spin_unlock_irqrestore(&pas_lock, flags);
-
- midi_busy = 1;
- qlen = qhead = qtail = 0;
- return 0;
-}
-
-static void pas_midi_close(int dev)
-{
-
- /*
- * Reset FIFO pointers, disable intrs
- */
- pas_write(0x20 | 0x40, 0x178b);
-
- pas_remove_intr(0x10);
- midi_busy = 0;
-}
-
-static int dump_to_midi(unsigned char midi_byte)
-{
- int fifo_space, x;
-
- fifo_space = ((x = pas_read(0x1B89)) >> 4) & 0x0f;
-
- /*
- * The MIDI FIFO space register and it's documentation is nonunderstandable.
- * There seem to be no way to differentiate between buffer full and buffer
- * empty situations. For this reason we don't never write the buffer
- * completely full. In this way we can assume that 0 (or is it 15)
- * means that the buffer is empty.
- */
-
- if (fifo_space < 2 && fifo_space != 0) /* Full (almost) */
- return 0; /* Ask upper layers to retry after some time */
-
- pas_write(midi_byte, 0x178A);
-
- return 1;
-}
-
-static int pas_midi_out(int dev, unsigned char midi_byte)
-{
-
- unsigned long flags;
-
- /*
- * Drain the local queue first
- */
-
- spin_lock_irqsave(&pas_lock, flags);
-
- while (qlen && dump_to_midi(tmp_queue[qhead]))
- {
- qlen--;
- qhead++;
- }
-
- spin_unlock_irqrestore(&pas_lock, flags);
-
- /*
- * Output the byte if the local queue is empty.
- */
-
- if (!qlen)
- if (dump_to_midi(midi_byte))
- return 1;
-
- /*
- * Put to the local queue
- */
-
- if (qlen >= 256)
- return 0; /* Local queue full */
-
- spin_lock_irqsave(&pas_lock, flags);
-
- tmp_queue[qtail] = midi_byte;
- qlen++;
- qtail++;
-
- spin_unlock_irqrestore(&pas_lock, flags);
-
- return 1;
-}
-
-static int pas_midi_start_read(int dev)
-{
- return 0;
-}
-
-static int pas_midi_end_read(int dev)
-{
- return 0;
-}
-
-static void pas_midi_kick(int dev)
-{
-}
-
-static int pas_buffer_status(int dev)
-{
- return qlen;
-}
-
-#define MIDI_SYNTH_NAME "Pro Audio Spectrum Midi"
-#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
-#include "midi_synth.h"
-
-static struct midi_operations pas_midi_operations =
-{
- .owner = THIS_MODULE,
- .info = {"Pro Audio Spectrum", 0, 0, SNDCARD_PAS},
- .converter = &std_midi_synth,
- .in_info = {0},
- .open = pas_midi_open,
- .close = pas_midi_close,
- .outputc = pas_midi_out,
- .start_read = pas_midi_start_read,
- .end_read = pas_midi_end_read,
- .kick = pas_midi_kick,
- .buffer_status = pas_buffer_status,
-};
-
-void __init pas_midi_init(void)
-{
- int dev = sound_alloc_mididev();
-
- if (dev == -1)
- {
- printk(KERN_WARNING "pas_midi_init: Too many midi devices detected\n");
- return;
- }
- std_midi_synth.midi_dev = my_dev = dev;
- midi_devs[dev] = &pas_midi_operations;
- pas2_mididev = dev;
- sequencer_init();
-}
-
-void pas_midi_interrupt(void)
-{
- unsigned char stat;
- int i, incount;
-
- stat = pas_read(0x1B88);
-
- if (stat & 0x04) /* Input data available */
- {
- incount = pas_read(0x1B89) & 0x0f; /* Input FIFO size */
- if (!incount)
- incount = 16;
-
- for (i = 0; i < incount; i++)
- if (input_opened)
- {
- midi_input_intr(my_dev, pas_read(0x178A));
- } else
- pas_read(0x178A); /* Flush */
- }
- if (stat & (0x08 | 0x10))
- {
- spin_lock(&pas_lock);/* called in irq context */
-
- while (qlen && dump_to_midi(tmp_queue[qhead]))
- {
- qlen--;
- qhead++;
- }
-
- spin_unlock(&pas_lock);
- }
- if (stat & 0x40)
- {
- printk(KERN_WARNING "MIDI output overrun %x,%x\n", pas_read(0x1B89), stat);
- }
- pas_write(stat, 0x1B88); /* Acknowledge interrupts */
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff