1 /*
2 * OSS compatible sequencer driver
3 *
4 * registration of device and proc
5 *
6 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/init.h>
24 #include <linux/moduleparam.h>
25 #include <linux/mutex.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/initval.h>
29 #include "seq_oss_device.h"
30 #include "seq_oss_synth.h"
31
32 /*
33 * module option
34 */
35 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
36 MODULE_DESCRIPTION("OSS-compatible sequencer module");
37 MODULE_LICENSE("GPL");
38 /* Takashi says this is really only for sound-service-0-, but this is OK. */
39 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
40 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
41
42 #ifdef SNDRV_SEQ_OSS_DEBUG
43 module_param(seq_oss_debug, int, 0644);
44 MODULE_PARM_DESC(seq_oss_debug, "debug option");
45 int seq_oss_debug = 0;
46 #endif
47
48
49 /*
50 * prototypes
51 */
52 static int register_device(void);
53 static void unregister_device(void);
54 #ifdef CONFIG_PROC_FS
55 static int register_proc(void);
56 static void unregister_proc(void);
57 #else
58 static inline int register_proc(void) { return 0; }
59 static inline void unregister_proc(void) {}
60 #endif
61
62 static int odev_open(struct inode *inode, struct file *file);
63 static int odev_release(struct inode *inode, struct file *file);
64 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
65 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
66 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
67 static unsigned int odev_poll(struct file *file, poll_table * wait);
68
69
70 /*
71 * module interface
72 */
73
74 static int __init alsa_seq_oss_init(void)
75 {
76 int rc;
77 static struct snd_seq_dev_ops ops = {
78 snd_seq_oss_synth_register,
79 snd_seq_oss_synth_unregister,
80 };
81
82 snd_seq_autoload_lock();
83 if ((rc = register_device()) < 0)
84 goto error;
85 if ((rc = register_proc()) < 0) {
86 unregister_device();
87 goto error;
88 }
89 if ((rc = snd_seq_oss_create_client()) < 0) {
90 unregister_proc();
91 unregister_device();
92 goto error;
93 }
94
95 if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
96 sizeof(struct snd_seq_oss_reg))) < 0) {
97 snd_seq_oss_delete_client();
98 unregister_proc();
99 unregister_device();
100 goto error;
101 }
102
103 /* success */
104 snd_seq_oss_synth_init();
105
106 error:
107 snd_seq_autoload_unlock();
108 return rc;
109 }
110
111 static void __exit alsa_seq_oss_exit(void)
112 {
113 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
114 snd_seq_oss_delete_client();
115 unregister_proc();
116 unregister_device();
117 }
118
119 module_init(alsa_seq_oss_init)
120 module_exit(alsa_seq_oss_exit)
121
122 /*
123 * ALSA minor device interface
124 */
125
126 static DEFINE_MUTEX(register_mutex);
127
128 static int
129 odev_open(struct inode *inode, struct file *file)
130 {
131 int level, rc;
132
133 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
134 level = SNDRV_SEQ_OSS_MODE_MUSIC;
135 else
136 level = SNDRV_SEQ_OSS_MODE_SYNTH;
137
138 mutex_lock(®ister_mutex);
139 rc = snd_seq_oss_open(file, level);
140 mutex_unlock(®ister_mutex);
141
142 return rc;
143 }
144
145 static int
146 odev_release(struct inode *inode, struct file *file)
147 {
148 struct seq_oss_devinfo *dp;
149
150 if ((dp = file->private_data) == NULL)
151 return 0;
152
153 snd_seq_oss_drain_write(dp);
154
155 mutex_lock(®ister_mutex);
156 snd_seq_oss_release(dp);
157 mutex_unlock(®ister_mutex);
158
159 return 0;
160 }
161
162 static ssize_t
163 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
164 {
165 struct seq_oss_devinfo *dp;
166 dp = file->private_data;
167 if (snd_BUG_ON(!dp))
168 return -ENXIO;
169 return snd_seq_oss_read(dp, buf, count);
170 }
171
172
173 static ssize_t
174 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
175 {
176 struct seq_oss_devinfo *dp;
177 dp = file->private_data;
178 if (snd_BUG_ON(!dp))
179 return -ENXIO;
180 return snd_seq_oss_write(dp, buf, count, file);
181 }
182
183 static long
184 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
185 {
186 struct seq_oss_devinfo *dp;
187 dp = file->private_data;
188 if (snd_BUG_ON(!dp))
189 return -ENXIO;
190 return snd_seq_oss_ioctl(dp, cmd, arg);
191 }
192
193 #ifdef CONFIG_COMPAT
194 #define odev_ioctl_compat odev_ioctl
195 #else
196 #define odev_ioctl_compat NULL
197 #endif
198
199 static unsigned int
200 odev_poll(struct file *file, poll_table * wait)
201 {
202 struct seq_oss_devinfo *dp;
203 dp = file->private_data;
204 if (snd_BUG_ON(!dp))
205 return -ENXIO;
206 return snd_seq_oss_poll(dp, file, wait);
207 }
208
209 /*
210 * registration of sequencer minor device
211 */
212
213 static const struct file_operations seq_oss_f_ops =
214 {
215 .owner = THIS_MODULE,
216 .read = odev_read,
217 .write = odev_write,
218 .open = odev_open,
219 .release = odev_release,
220 .poll = odev_poll,
221 .unlocked_ioctl = odev_ioctl,
222 .compat_ioctl = odev_ioctl_compat,
223 };
224
225 static int __init
226 register_device(void)
227 {
228 int rc;
229
230 mutex_lock(®ister_mutex);
231 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
232 NULL, 0,
233 &seq_oss_f_ops, NULL,
234 SNDRV_SEQ_OSS_DEVNAME)) < 0) {
235 snd_printk(KERN_ERR "can't register device seq\n");
236 mutex_unlock(®ister_mutex);
237 return rc;
238 }
239 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
240 NULL, 0,
241 &seq_oss_f_ops, NULL,
242 SNDRV_SEQ_OSS_DEVNAME)) < 0) {
243 snd_printk(KERN_ERR "can't register device music\n");
244 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
245 mutex_unlock(®ister_mutex);
246 return rc;
247 }
248 debug_printk(("device registered\n"));
249 mutex_unlock(®ister_mutex);
250 return 0;
251 }
252
253 static void
254 unregister_device(void)
255 {
256 mutex_lock(®ister_mutex);
257 debug_printk(("device unregistered\n"));
258 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
259 snd_printk(KERN_ERR "error unregister device music\n");
260 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
261 snd_printk(KERN_ERR "error unregister device seq\n");
262 mutex_unlock(®ister_mutex);
263 }
264
265 /*
266 * /proc interface
267 */
268
269 #ifdef CONFIG_PROC_FS
270
271 static struct snd_info_entry *info_entry;
272
273 static void
274 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
275 {
276 mutex_lock(®ister_mutex);
277 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
278 snd_seq_oss_system_info_read(buf);
279 snd_seq_oss_synth_info_read(buf);
280 snd_seq_oss_midi_info_read(buf);
281 mutex_unlock(®ister_mutex);
282 }
283
284
285 static int __init
286 register_proc(void)
287 {
288 struct snd_info_entry *entry;
289
290 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
291 if (entry == NULL)
292 return -ENOMEM;
293
294 entry->content = SNDRV_INFO_CONTENT_TEXT;
295 entry->private_data = NULL;
296 entry->c.text.read = info_read;
297 if (snd_info_register(entry) < 0) {
298 snd_info_free_entry(entry);
299 return -ENOMEM;
300 }
301 info_entry = entry;
302 return 0;
303 }
304
305 static void
306 unregister_proc(void)
307 {
308 snd_info_free_entry(info_entry);
309 info_entry = NULL;
310 }
311 #endif /* CONFIG_PROC_FS */
312
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