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Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
256 lines
4.9 KiB
C
256 lines
4.9 KiB
C
/*
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* sound/gus2_midi.c
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*
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* The low level driver for the GUS Midi Interface.
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*
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*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*
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* Changes:
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* 11-10-2000 Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
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* Added __init to gus_midi_init()
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*/
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include "sound_config.h"
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#include "gus.h"
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#include "gus_hw.h"
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static int midi_busy, input_opened;
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static int my_dev;
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static int output_used;
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static volatile unsigned char gus_midi_control;
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static void (*midi_input_intr) (int dev, unsigned char data);
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static unsigned char tmp_queue[256];
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extern int gus_pnp_flag;
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static volatile int qlen;
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static volatile unsigned char qhead, qtail;
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extern int gus_base, gus_irq, gus_dma;
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extern int *gus_osp;
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extern spinlock_t gus_lock;
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static int GUS_MIDI_STATUS(void)
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{
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return inb(u_MidiStatus);
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}
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static int gus_midi_open(int dev, int mode, void (*input) (int dev, unsigned char data), void (*output) (int dev))
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{
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if (midi_busy)
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{
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/* printk("GUS: Midi busy\n");*/
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return -EBUSY;
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}
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outb((MIDI_RESET), u_MidiControl);
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gus_delay();
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gus_midi_control = 0;
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input_opened = 0;
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if (mode == OPEN_READ || mode == OPEN_READWRITE)
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if (!gus_pnp_flag)
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{
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gus_midi_control |= MIDI_ENABLE_RCV;
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input_opened = 1;
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}
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outb((gus_midi_control), u_MidiControl); /* Enable */
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midi_busy = 1;
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qlen = qhead = qtail = output_used = 0;
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midi_input_intr = input;
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return 0;
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}
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static int dump_to_midi(unsigned char midi_byte)
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{
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unsigned long flags;
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int ok = 0;
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output_used = 1;
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spin_lock_irqsave(&gus_lock, flags);
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if (GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY)
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{
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ok = 1;
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outb((midi_byte), u_MidiData);
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}
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else
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{
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/*
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* Enable Midi xmit interrupts (again)
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*/
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gus_midi_control |= MIDI_ENABLE_XMIT;
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outb((gus_midi_control), u_MidiControl);
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}
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spin_unlock_irqrestore(&gus_lock,flags);
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return ok;
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}
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static void gus_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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outb((MIDI_RESET), u_MidiControl);
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midi_busy = 0;
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}
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static int gus_midi_out(int dev, unsigned char midi_byte)
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{
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unsigned long flags;
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/*
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* Drain the local queue first
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*/
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spin_lock_irqsave(&gus_lock, flags);
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while (qlen && dump_to_midi(tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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spin_unlock_irqrestore(&gus_lock,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; /*
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* OK
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*/
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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; /*
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* Local queue full
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*/
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spin_lock_irqsave(&gus_lock, flags);
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tmp_queue[qtail] = midi_byte;
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qlen++;
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qtail++;
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spin_unlock_irqrestore(&gus_lock,flags);
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return 1;
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}
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static int gus_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 gus_midi_end_read(int dev)
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{
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return 0;
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}
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static void gus_midi_kick(int dev)
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{
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}
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static int gus_midi_buffer_status(int dev)
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{
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unsigned long flags;
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if (!output_used)
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return 0;
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spin_lock_irqsave(&gus_lock, flags);
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if (qlen && dump_to_midi(tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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spin_unlock_irqrestore(&gus_lock,flags);
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return (qlen > 0) || !(GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY);
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}
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#define MIDI_SYNTH_NAME "Gravis Ultrasound Midi"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include "midi_synth.h"
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static struct midi_operations gus_midi_operations =
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{
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.owner = THIS_MODULE,
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.info = {"Gravis UltraSound Midi", 0, 0, SNDCARD_GUS},
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.converter = &std_midi_synth,
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.in_info = {0},
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.open = gus_midi_open,
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.close = gus_midi_close,
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.outputc = gus_midi_out,
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.start_read = gus_midi_start_read,
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.end_read = gus_midi_end_read,
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.kick = gus_midi_kick,
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.buffer_status = gus_midi_buffer_status,
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};
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void __init gus_midi_init(struct address_info *hw_config)
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{
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int dev = sound_alloc_mididev();
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if (dev == -1)
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{
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printk(KERN_INFO "gus_midi: Too many midi devices detected\n");
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return;
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}
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outb((MIDI_RESET), u_MidiControl);
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std_midi_synth.midi_dev = my_dev = dev;
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hw_config->slots[2] = dev;
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midi_devs[dev] = &gus_midi_operations;
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sequencer_init();
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return;
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}
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void gus_midi_interrupt(int dummy)
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{
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volatile unsigned char stat, data;
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int timeout = 10;
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spin_lock(&gus_lock);
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while (timeout-- > 0 && (stat = GUS_MIDI_STATUS()) & (MIDI_RCV_FULL | MIDI_XMIT_EMPTY))
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{
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if (stat & MIDI_RCV_FULL)
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{
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data = inb(u_MidiData);
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if (input_opened)
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midi_input_intr(my_dev, data);
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}
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if (stat & MIDI_XMIT_EMPTY)
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{
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while (qlen && dump_to_midi(tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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if (!qlen)
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{
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/*
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* Disable Midi output interrupts, since no data in the buffer
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*/
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gus_midi_control &= ~MIDI_ENABLE_XMIT;
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outb((gus_midi_control), u_MidiControl);
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outb((gus_midi_control), u_MidiControl);
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}
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}
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}
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spin_unlock(&gus_lock);
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}
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