diff options
Diffstat (limited to 'sound/oss/pas2_midi.c')
| -rw-r--r-- | sound/oss/pas2_midi.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/sound/oss/pas2_midi.c b/sound/oss/pas2_midi.c deleted file mode 100644 index 1122d10a20c3..000000000000 --- a/sound/oss/pas2_midi.c +++ /dev/null @@ -1,262 +0,0 @@ -/* - * 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 */ -} |