![Linus Torvalds](/assets/img/avatar_default.png)
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!
206 lines
4.3 KiB
C
206 lines
4.3 KiB
C
/*
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* sound/sb_dsp.c
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*
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* The low level driver for the Sound Blaster DS chips.
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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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#include <linux/spinlock.h>
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#include "sound_config.h"
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#include "sb.h"
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#undef SB_TEST_IRQ
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/*
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* The DSP channel can be used either for input or output. Variable
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* 'sb_irq_mode' will be set when the program calls read or write first time
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* after open. Current version doesn't support mode changes without closing
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* and reopening the device. Support for this feature may be implemented in a
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* future version of this driver.
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*/
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static int sb_midi_open(int dev, int mode,
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void (*input) (int dev, unsigned char data),
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void (*output) (int dev)
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)
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{
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sb_devc *devc = midi_devs[dev]->devc;
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unsigned long flags;
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if (devc == NULL)
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return -ENXIO;
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spin_lock_irqsave(&devc->lock, flags);
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if (devc->opened)
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{
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spin_unlock_irqrestore(&devc->lock, flags);
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return -EBUSY;
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}
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devc->opened = 1;
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spin_unlock_irqrestore(&devc->lock, flags);
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devc->irq_mode = IMODE_MIDI;
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devc->midi_broken = 0;
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sb_dsp_reset(devc);
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if (!sb_dsp_command(devc, 0x35)) /* Start MIDI UART mode */
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{
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devc->opened = 0;
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return -EIO;
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}
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devc->intr_active = 1;
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if (mode & OPEN_READ)
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{
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devc->input_opened = 1;
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devc->midi_input_intr = input;
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}
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return 0;
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}
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static void sb_midi_close(int dev)
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{
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sb_devc *devc = midi_devs[dev]->devc;
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unsigned long flags;
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if (devc == NULL)
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return;
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spin_lock_irqsave(&devc->lock, flags);
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sb_dsp_reset(devc);
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devc->intr_active = 0;
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devc->input_opened = 0;
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devc->opened = 0;
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spin_unlock_irqrestore(&devc->lock, flags);
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}
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static int sb_midi_out(int dev, unsigned char midi_byte)
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{
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sb_devc *devc = midi_devs[dev]->devc;
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if (devc == NULL)
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return 1;
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if (devc->midi_broken)
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return 1;
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if (!sb_dsp_command(devc, midi_byte))
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{
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devc->midi_broken = 1;
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return 1;
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}
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return 1;
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}
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static int sb_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 sb_midi_end_read(int dev)
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{
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sb_devc *devc = midi_devs[dev]->devc;
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if (devc == NULL)
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return -ENXIO;
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sb_dsp_reset(devc);
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devc->intr_active = 0;
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return 0;
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}
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static int sb_midi_ioctl(int dev, unsigned cmd, void __user *arg)
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{
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return -EINVAL;
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}
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void sb_midi_interrupt(sb_devc * devc)
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{
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unsigned long flags;
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unsigned char data;
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if (devc == NULL)
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return;
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spin_lock_irqsave(&devc->lock, flags);
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data = inb(DSP_READ);
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if (devc->input_opened)
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devc->midi_input_intr(devc->my_mididev, data);
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spin_unlock_irqrestore(&devc->lock, flags);
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}
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#define MIDI_SYNTH_NAME "Sound Blaster Midi"
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#define MIDI_SYNTH_CAPS 0
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#include "midi_synth.h"
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static struct midi_operations sb_midi_operations =
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{
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.owner = THIS_MODULE,
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.info = {"Sound Blaster", 0, 0, SNDCARD_SB},
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.converter = &std_midi_synth,
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.in_info = {0},
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.open = sb_midi_open,
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.close = sb_midi_close,
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.ioctl = sb_midi_ioctl,
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.outputc = sb_midi_out,
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.start_read = sb_midi_start_read,
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.end_read = sb_midi_end_read,
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};
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void sb_dsp_midi_init(sb_devc * devc, struct module *owner)
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{
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int dev;
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if (devc->model < 2) /* No MIDI support for SB 1.x */
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return;
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dev = sound_alloc_mididev();
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if (dev == -1)
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{
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printk(KERN_ERR "sb_midi: too many MIDI devices detected\n");
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return;
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}
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std_midi_synth.midi_dev = devc->my_mididev = dev;
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midi_devs[dev] = (struct midi_operations *)kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
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if (midi_devs[dev] == NULL)
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{
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printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
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sound_unload_mididev(dev);
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return;
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}
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memcpy((char *) midi_devs[dev], (char *) &sb_midi_operations,
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sizeof(struct midi_operations));
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if (owner)
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midi_devs[dev]->owner = owner;
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midi_devs[dev]->devc = devc;
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midi_devs[dev]->converter = (struct synth_operations *)kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
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if (midi_devs[dev]->converter == NULL)
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{
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printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
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kfree(midi_devs[dev]);
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sound_unload_mididev(dev);
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return;
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}
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memcpy((char *) midi_devs[dev]->converter, (char *) &std_midi_synth,
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sizeof(struct synth_operations));
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midi_devs[dev]->converter->id = "SBMIDI";
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sequencer_init();
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}
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