Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * sound/dev_table.c
3 *
4 * Device call tables.
5 *
6 *
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
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
11 * for more info.
12 */
13
14#include <linux/init.h>
15
16#define _DEV_TABLE_C_
17#include "sound_config.h"
18
19static int sound_alloc_audiodev(void);
20
21int sound_install_audiodrv(int vers, char *name, struct audio_driver *driver,
22 int driver_size, int flags, unsigned int format_mask,
23 void *devc, int dma1, int dma2)
24{
25 struct audio_driver *d;
26 struct audio_operations *op;
27 int num;
28
29 if (vers != AUDIO_DRIVER_VERSION || driver_size > sizeof(struct audio_driver)) {
30 printk(KERN_ERR "Sound: Incompatible audio driver for %s\n", name);
31 return -(EINVAL);
32 }
33 num = sound_alloc_audiodev();
34
35 if (num == -1) {
36 printk(KERN_ERR "sound: Too many audio drivers\n");
37 return -(EBUSY);
38 }
39 d = (struct audio_driver *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_driver)));
40
41 if (sound_nblocks < 1024)
42 sound_nblocks++;
43
44 op = (struct audio_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_operations)));
45
46 if (sound_nblocks < 1024)
47 sound_nblocks++;
48 if (d == NULL || op == NULL) {
49 printk(KERN_ERR "Sound: Can't allocate driver for (%s)\n", name);
50 sound_unload_audiodev(num);
51 return -(ENOMEM);
52 }
53 memset((char *) op, 0, sizeof(struct audio_operations));
54 init_waitqueue_head(&op->in_sleeper);
55 init_waitqueue_head(&op->out_sleeper);
56 init_waitqueue_head(&op->poll_sleeper);
57 if (driver_size < sizeof(struct audio_driver))
58 memset((char *) d, 0, sizeof(struct audio_driver));
59
60 memcpy((char *) d, (char *) driver, driver_size);
61
62 op->d = d;
63 strlcpy(op->name, name, sizeof(op->name));
64 op->flags = flags;
65 op->format_mask = format_mask;
66 op->devc = devc;
67
68 /*
69 * Hardcoded defaults
70 */
71 audio_devs[num] = op;
72
73 DMAbuf_init(num, dma1, dma2);
74
75 audio_init_devices();
76 return num;
77}
78
79int sound_install_mixer(int vers, char *name, struct mixer_operations *driver,
80 int driver_size, void *devc)
81{
82 struct mixer_operations *op;
83
84 int n = sound_alloc_mixerdev();
85
86 if (n == -1) {
87 printk(KERN_ERR "Sound: Too many mixer drivers\n");
88 return -EBUSY;
89 }
90 if (vers != MIXER_DRIVER_VERSION ||
91 driver_size > sizeof(struct mixer_operations)) {
92 printk(KERN_ERR "Sound: Incompatible mixer driver for %s\n", name);
93 return -EINVAL;
94 }
95
96 /* FIXME: This leaks a mixer_operations struct every time its called
97 until you unload sound! */
98
99 op = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct mixer_operations)));
100
101 if (sound_nblocks < 1024)
102 sound_nblocks++;
103 if (op == NULL) {
104 printk(KERN_ERR "Sound: Can't allocate mixer driver for (%s)\n", name);
105 return -ENOMEM;
106 }
107 memset((char *) op, 0, sizeof(struct mixer_operations));
108 memcpy((char *) op, (char *) driver, driver_size);
109
110 strlcpy(op->name, name, sizeof(op->name));
111 op->devc = devc;
112
113 mixer_devs[n] = op;
114 return n;
115}
116
117void sound_unload_audiodev(int dev)
118{
119 if (dev != -1) {
120 DMAbuf_deinit(dev);
121 audio_devs[dev] = NULL;
122 unregister_sound_dsp((dev<<4)+3);
123 }
124}
125
126static int sound_alloc_audiodev(void)
127{
128 int i = register_sound_dsp(&oss_sound_fops, -1);
129 if(i==-1)
130 return i;
131 i>>=4;
132 if(i>=num_audiodevs)
133 num_audiodevs = i + 1;
134 return i;
135}
136
137int sound_alloc_mididev(void)
138{
139 int i = register_sound_midi(&oss_sound_fops, -1);
140 if(i==-1)
141 return i;
142 i>>=4;
143 if(i>=num_midis)
144 num_midis = i + 1;
145 return i;
146}
147
148int sound_alloc_synthdev(void)
149{
150 int i;
151
152 for (i = 0; i < MAX_SYNTH_DEV; i++) {
153 if (synth_devs[i] == NULL) {
154 if (i >= num_synths)
155 num_synths++;
156 return i;
157 }
158 }
159 return -1;
160}
161
162int sound_alloc_mixerdev(void)
163{
164 int i = register_sound_mixer(&oss_sound_fops, -1);
165 if(i==-1)
166 return -1;
167 i>>=4;
168 if(i>=num_mixers)
169 num_mixers = i + 1;
170 return i;
171}
172
173int sound_alloc_timerdev(void)
174{
175 int i;
176
177 for (i = 0; i < MAX_TIMER_DEV; i++) {
178 if (sound_timer_devs[i] == NULL) {
179 if (i >= num_sound_timers)
180 num_sound_timers++;
181 return i;
182 }
183 }
184 return -1;
185}
186
187void sound_unload_mixerdev(int dev)
188{
189 if (dev != -1) {
190 mixer_devs[dev] = NULL;
191 unregister_sound_mixer(dev<<4);
192 num_mixers--;
193 }
194}
195
196void sound_unload_mididev(int dev)
197{
198 if (dev != -1) {
199 midi_devs[dev] = NULL;
200 unregister_sound_midi((dev<<4)+2);
201 }
202}
203
204void sound_unload_synthdev(int dev)
205{
206 if (dev != -1)
207 synth_devs[dev] = NULL;
208}
209
210void sound_unload_timerdev(int dev)
211{
212 if (dev != -1)
213 sound_timer_devs[dev] = NULL;
214}