4 * The low level driver for the Sound Blaster DS chips.
7 * Copyright (C) by Hannu Savolainen 1993-1996
9 * USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
15 * Alan Cox Modularisation, changed memory allocations
16 * Christoph Hellwig Adapted to module_init/module_exit
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include "sound_config.h"
30 static vmidi_devc *v_devc[2] = { NULL, NULL};
31 static int midi1,midi2;
32 static void *midi_mem = NULL;
35 * The DSP channel can be used either for input or output. Variable
36 * 'sb_irq_mode' will be set when the program calls read or write first time
37 * after open. Current version doesn't support mode changes without closing
38 * and reopening the device. Support for this feature may be implemented in a
39 * future version of this driver.
43 static int v_midi_open (int dev, int mode,
44 void (*input) (int dev, unsigned char data),
45 void (*output) (int dev)
48 vmidi_devc *devc = midi_devs[dev]->devc;
54 spin_lock_irqsave(&devc->lock,flags);
57 spin_unlock_irqrestore(&devc->lock,flags);
61 spin_unlock_irqrestore(&devc->lock,flags);
63 devc->intr_active = 1;
67 devc->input_opened = 1;
68 devc->midi_input_intr = input;
74 static void v_midi_close (int dev)
76 vmidi_devc *devc = midi_devs[dev]->devc;
82 spin_lock_irqsave(&devc->lock,flags);
83 devc->intr_active = 0;
84 devc->input_opened = 0;
86 spin_unlock_irqrestore(&devc->lock,flags);
89 static int v_midi_out (int dev, unsigned char midi_byte)
91 vmidi_devc *devc = midi_devs[dev]->devc;
97 pdevc = midi_devs[devc->pair_mididev]->devc;
98 if (pdevc->input_opened > 0){
99 if (MIDIbuf_avail(pdevc->my_mididev) > 500)
101 pdevc->midi_input_intr (pdevc->my_mididev, midi_byte);
106 static inline int v_midi_start_read (int dev)
111 static int v_midi_end_read (int dev)
113 vmidi_devc *devc = midi_devs[dev]->devc;
117 devc->intr_active = 0;
121 /* why -EPERM and not -EINVAL?? */
123 static inline int v_midi_ioctl (int dev, unsigned cmd, void __user *arg)
129 #define MIDI_SYNTH_NAME "Loopback MIDI"
130 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
132 #include "midi_synth.h"
134 static struct midi_operations v_midi_operations =
136 .owner = THIS_MODULE,
137 .info = {"Loopback MIDI Port 1", 0, 0, SNDCARD_VMIDI},
138 .converter = &std_midi_synth,
141 .close = v_midi_close,
142 .ioctl = v_midi_ioctl,
143 .outputc = v_midi_out,
144 .start_read = v_midi_start_read,
145 .end_read = v_midi_end_read,
148 static struct midi_operations v_midi_operations2 =
150 .owner = THIS_MODULE,
151 .info = {"Loopback MIDI Port 2", 0, 0, SNDCARD_VMIDI},
152 .converter = &std_midi_synth,
155 .close = v_midi_close,
156 .ioctl = v_midi_ioctl,
157 .outputc = v_midi_out,
158 .start_read = v_midi_start_read,
159 .end_read = v_midi_end_read,
163 * We kmalloc just one of these - it makes life simpler and the code
164 * cleaner and the memory handling far more efficient
170 struct midi_operations m_ops[2];
171 struct synth_operations s_ops[2];
172 struct vmidi_devc v_ops[2];
175 static void __init attach_v_midi (struct address_info *hw_config)
177 struct vmidi_memory *m;
178 /* printk("Attaching v_midi device.....\n"); */
180 midi1 = sound_alloc_mididev();
183 printk(KERN_ERR "v_midi: Too many midi devices detected\n");
187 m = kmalloc(sizeof(struct vmidi_memory), GFP_KERNEL);
190 printk(KERN_WARNING "Loopback MIDI: Failed to allocate memory\n");
191 sound_unload_mididev(midi1);
197 midi_devs[midi1] = &m->m_ops[0];
200 midi2 = sound_alloc_mididev();
203 printk (KERN_ERR "v_midi: Too many midi devices detected\n");
205 sound_unload_mididev(midi1);
209 midi_devs[midi2] = &m->m_ops[1];
211 /* printk("VMIDI1: %d VMIDI2: %d\n",midi1,midi2); */
214 v_devc[0] = &m->v_ops[0];
215 memcpy ((char *) midi_devs[midi1], (char *) &v_midi_operations,
216 sizeof (struct midi_operations));
218 v_devc[0]->my_mididev = midi1;
219 v_devc[0]->pair_mididev = midi2;
220 v_devc[0]->opened = v_devc[0]->input_opened = 0;
221 v_devc[0]->intr_active = 0;
222 v_devc[0]->midi_input_intr = NULL;
223 spin_lock_init(&v_devc[0]->lock);
225 midi_devs[midi1]->devc = v_devc[0];
227 midi_devs[midi1]->converter = &m->s_ops[0];
228 std_midi_synth.midi_dev = midi1;
229 memcpy ((char *) midi_devs[midi1]->converter, (char *) &std_midi_synth,
230 sizeof (struct synth_operations));
231 midi_devs[midi1]->converter->id = "V_MIDI 1";
234 v_devc[1] = &m->v_ops[1];
236 memcpy ((char *) midi_devs[midi2], (char *) &v_midi_operations2,
237 sizeof (struct midi_operations));
239 v_devc[1]->my_mididev = midi2;
240 v_devc[1]->pair_mididev = midi1;
241 v_devc[1]->opened = v_devc[1]->input_opened = 0;
242 v_devc[1]->intr_active = 0;
243 v_devc[1]->midi_input_intr = NULL;
244 spin_lock_init(&v_devc[1]->lock);
246 midi_devs[midi2]->devc = v_devc[1];
247 midi_devs[midi2]->converter = &m->s_ops[1];
249 std_midi_synth.midi_dev = midi2;
250 memcpy ((char *) midi_devs[midi2]->converter, (char *) &std_midi_synth,
251 sizeof (struct synth_operations));
252 midi_devs[midi2]->converter->id = "V_MIDI 2";
255 /* printk("Attached v_midi device\n"); */
258 static inline int __init probe_v_midi(struct address_info *hw_config)
260 return(1); /* always OK */
264 static void __exit unload_v_midi(struct address_info *hw_config)
266 sound_unload_mididev(midi1);
267 sound_unload_mididev(midi2);
271 static struct address_info cfg; /* dummy */
273 static int __init init_vmidi(void)
275 printk("MIDI Loopback device driver\n");
276 if (!probe_v_midi(&cfg))
283 static void __exit cleanup_vmidi(void)
288 module_init(init_vmidi);
289 module_exit(cleanup_vmidi);
290 MODULE_LICENSE("GPL");