4 * The low level driver for the Sound Blaster DS chips.
7 * Copyright (C) by Hannu Savolainen 1993-1997
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
14 #include <linux/spinlock.h>
16 #include "sound_config.h"
22 * The DSP channel can be used either for input or output. Variable
23 * 'sb_irq_mode' will be set when the program calls read or write first time
24 * after open. Current version doesn't support mode changes without closing
25 * and reopening the device. Support for this feature may be implemented in a
26 * future version of this driver.
30 static int sb_midi_open(int dev, int mode,
31 void (*input) (int dev, unsigned char data),
32 void (*output) (int dev)
35 sb_devc *devc = midi_devs[dev]->devc;
41 spin_lock_irqsave(&devc->lock, flags);
44 spin_unlock_irqrestore(&devc->lock, flags);
48 spin_unlock_irqrestore(&devc->lock, flags);
50 devc->irq_mode = IMODE_MIDI;
51 devc->midi_broken = 0;
55 if (!sb_dsp_command(devc, 0x35)) /* Start MIDI UART mode */
60 devc->intr_active = 1;
64 devc->input_opened = 1;
65 devc->midi_input_intr = input;
70 static void sb_midi_close(int dev)
72 sb_devc *devc = midi_devs[dev]->devc;
78 spin_lock_irqsave(&devc->lock, flags);
80 devc->intr_active = 0;
81 devc->input_opened = 0;
83 spin_unlock_irqrestore(&devc->lock, flags);
86 static int sb_midi_out(int dev, unsigned char midi_byte)
88 sb_devc *devc = midi_devs[dev]->devc;
93 if (devc->midi_broken)
96 if (!sb_dsp_command(devc, midi_byte))
98 devc->midi_broken = 1;
104 static int sb_midi_start_read(int dev)
109 static int sb_midi_end_read(int dev)
111 sb_devc *devc = midi_devs[dev]->devc;
117 devc->intr_active = 0;
121 static int sb_midi_ioctl(int dev, unsigned cmd, void __user *arg)
126 void sb_midi_interrupt(sb_devc * devc)
134 spin_lock_irqsave(&devc->lock, flags);
136 data = inb(DSP_READ);
137 if (devc->input_opened)
138 devc->midi_input_intr(devc->my_mididev, data);
140 spin_unlock_irqrestore(&devc->lock, flags);
143 #define MIDI_SYNTH_NAME "Sound Blaster Midi"
144 #define MIDI_SYNTH_CAPS 0
145 #include "midi_synth.h"
147 static struct midi_operations sb_midi_operations =
149 .owner = THIS_MODULE,
150 .info = {"Sound Blaster", 0, 0, SNDCARD_SB},
151 .converter = &std_midi_synth,
153 .open = sb_midi_open,
154 .close = sb_midi_close,
155 .ioctl = sb_midi_ioctl,
156 .outputc = sb_midi_out,
157 .start_read = sb_midi_start_read,
158 .end_read = sb_midi_end_read,
161 void sb_dsp_midi_init(sb_devc * devc, struct module *owner)
165 if (devc->model < 2) /* No MIDI support for SB 1.x */
168 dev = sound_alloc_mididev();
172 printk(KERN_ERR "sb_midi: too many MIDI devices detected\n");
175 std_midi_synth.midi_dev = devc->my_mididev = dev;
176 midi_devs[dev] = (struct midi_operations *)kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
177 if (midi_devs[dev] == NULL)
179 printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
180 sound_unload_mididev(dev);
183 memcpy((char *) midi_devs[dev], (char *) &sb_midi_operations,
184 sizeof(struct midi_operations));
187 midi_devs[dev]->owner = owner;
189 midi_devs[dev]->devc = devc;
192 midi_devs[dev]->converter = (struct synth_operations *)kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
193 if (midi_devs[dev]->converter == NULL)
195 printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
196 kfree(midi_devs[dev]);
197 sound_unload_mididev(dev);
200 memcpy((char *) midi_devs[dev]->converter, (char *) &std_midi_synth,
201 sizeof(struct synth_operations));
203 midi_devs[dev]->converter->id = "SBMIDI";