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/module.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
43 /*
44 * prototypes
45 */
46 static int register_device(void);
47 static void unregister_device(void);
48 #ifdef CONFIG_SND_PROC_FS
49 static int register_proc(void);
50 static void unregister_proc(void);
51 #else
register_proc(void)52 static inline int register_proc(void) { return 0; }
unregister_proc(void)53 static inline void unregister_proc(void) {}
54 #endif
55
56 static int odev_open(struct inode *inode, struct file *file);
57 static int odev_release(struct inode *inode, struct file *file);
58 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
59 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
60 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
61 static unsigned int odev_poll(struct file *file, poll_table * wait);
62
63
64 /*
65 * module interface
66 */
67
68 static struct snd_seq_driver seq_oss_synth_driver = {
69 .driver = {
70 .name = KBUILD_MODNAME,
71 .probe = snd_seq_oss_synth_probe,
72 .remove = snd_seq_oss_synth_remove,
73 },
74 .id = SNDRV_SEQ_DEV_ID_OSS,
75 .argsize = sizeof(struct snd_seq_oss_reg),
76 };
77
alsa_seq_oss_init(void)78 static int __init alsa_seq_oss_init(void)
79 {
80 int rc;
81
82 if ((rc = register_device()) < 0)
83 goto error;
84 if ((rc = register_proc()) < 0) {
85 unregister_device();
86 goto error;
87 }
88 if ((rc = snd_seq_oss_create_client()) < 0) {
89 unregister_proc();
90 unregister_device();
91 goto error;
92 }
93
94 rc = snd_seq_driver_register(&seq_oss_synth_driver);
95 if (rc < 0) {
96 snd_seq_oss_delete_client();
97 unregister_proc();
98 unregister_device();
99 goto error;
100 }
101
102 /* success */
103 snd_seq_oss_synth_init();
104
105 error:
106 return rc;
107 }
108
alsa_seq_oss_exit(void)109 static void __exit alsa_seq_oss_exit(void)
110 {
111 snd_seq_driver_unregister(&seq_oss_synth_driver);
112 snd_seq_oss_delete_client();
113 unregister_proc();
114 unregister_device();
115 }
116
117 module_init(alsa_seq_oss_init)
118 module_exit(alsa_seq_oss_exit)
119
120 /*
121 * ALSA minor device interface
122 */
123
124 static DEFINE_MUTEX(register_mutex);
125
126 static int
odev_open(struct inode * inode,struct file * file)127 odev_open(struct inode *inode, struct file *file)
128 {
129 int level, rc;
130
131 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
132 level = SNDRV_SEQ_OSS_MODE_MUSIC;
133 else
134 level = SNDRV_SEQ_OSS_MODE_SYNTH;
135
136 mutex_lock(®ister_mutex);
137 rc = snd_seq_oss_open(file, level);
138 mutex_unlock(®ister_mutex);
139
140 return rc;
141 }
142
143 static int
odev_release(struct inode * inode,struct file * file)144 odev_release(struct inode *inode, struct file *file)
145 {
146 struct seq_oss_devinfo *dp;
147
148 if ((dp = file->private_data) == NULL)
149 return 0;
150
151 mutex_lock(®ister_mutex);
152 snd_seq_oss_release(dp);
153 mutex_unlock(®ister_mutex);
154
155 return 0;
156 }
157
158 static ssize_t
odev_read(struct file * file,char __user * buf,size_t count,loff_t * offset)159 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
160 {
161 struct seq_oss_devinfo *dp;
162 dp = file->private_data;
163 if (snd_BUG_ON(!dp))
164 return -ENXIO;
165 return snd_seq_oss_read(dp, buf, count);
166 }
167
168
169 static ssize_t
odev_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)170 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
171 {
172 struct seq_oss_devinfo *dp;
173 dp = file->private_data;
174 if (snd_BUG_ON(!dp))
175 return -ENXIO;
176 return snd_seq_oss_write(dp, buf, count, file);
177 }
178
179 static long
odev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)180 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
181 {
182 struct seq_oss_devinfo *dp;
183 long rc;
184
185 dp = file->private_data;
186 if (snd_BUG_ON(!dp))
187 return -ENXIO;
188
189 if (cmd != SNDCTL_SEQ_SYNC &&
190 mutex_lock_interruptible(®ister_mutex))
191 return -ERESTARTSYS;
192 rc = snd_seq_oss_ioctl(dp, cmd, arg);
193 if (cmd != SNDCTL_SEQ_SYNC)
194 mutex_unlock(®ister_mutex);
195 return rc;
196 }
197
198 #ifdef CONFIG_COMPAT
199 #define odev_ioctl_compat odev_ioctl
200 #else
201 #define odev_ioctl_compat NULL
202 #endif
203
204 static unsigned int
odev_poll(struct file * file,poll_table * wait)205 odev_poll(struct file *file, poll_table * wait)
206 {
207 struct seq_oss_devinfo *dp;
208 dp = file->private_data;
209 if (snd_BUG_ON(!dp))
210 return -ENXIO;
211 return snd_seq_oss_poll(dp, file, wait);
212 }
213
214 /*
215 * registration of sequencer minor device
216 */
217
218 static const struct file_operations seq_oss_f_ops =
219 {
220 .owner = THIS_MODULE,
221 .read = odev_read,
222 .write = odev_write,
223 .open = odev_open,
224 .release = odev_release,
225 .poll = odev_poll,
226 .unlocked_ioctl = odev_ioctl,
227 .compat_ioctl = odev_ioctl_compat,
228 .llseek = noop_llseek,
229 };
230
231 static int __init
register_device(void)232 register_device(void)
233 {
234 int rc;
235
236 mutex_lock(®ister_mutex);
237 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
238 NULL, 0,
239 &seq_oss_f_ops, NULL)) < 0) {
240 pr_err("ALSA: seq_oss: can't register device seq\n");
241 mutex_unlock(®ister_mutex);
242 return rc;
243 }
244 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
245 NULL, 0,
246 &seq_oss_f_ops, NULL)) < 0) {
247 pr_err("ALSA: seq_oss: can't register device music\n");
248 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
249 mutex_unlock(®ister_mutex);
250 return rc;
251 }
252 mutex_unlock(®ister_mutex);
253 return 0;
254 }
255
256 static void
unregister_device(void)257 unregister_device(void)
258 {
259 mutex_lock(®ister_mutex);
260 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
261 pr_err("ALSA: seq_oss: error unregister device music\n");
262 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
263 pr_err("ALSA: seq_oss: error unregister device seq\n");
264 mutex_unlock(®ister_mutex);
265 }
266
267 /*
268 * /proc interface
269 */
270
271 #ifdef CONFIG_SND_PROC_FS
272
273 static struct snd_info_entry *info_entry;
274
275 static void
info_read(struct snd_info_entry * entry,struct snd_info_buffer * buf)276 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
277 {
278 mutex_lock(®ister_mutex);
279 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
280 snd_seq_oss_system_info_read(buf);
281 snd_seq_oss_synth_info_read(buf);
282 snd_seq_oss_midi_info_read(buf);
283 mutex_unlock(®ister_mutex);
284 }
285
286
287 static int __init
register_proc(void)288 register_proc(void)
289 {
290 struct snd_info_entry *entry;
291
292 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
293 if (entry == NULL)
294 return -ENOMEM;
295
296 entry->content = SNDRV_INFO_CONTENT_TEXT;
297 entry->private_data = NULL;
298 entry->c.text.read = info_read;
299 if (snd_info_register(entry) < 0) {
300 snd_info_free_entry(entry);
301 return -ENOMEM;
302 }
303 info_entry = entry;
304 return 0;
305 }
306
307 static void
unregister_proc(void)308 unregister_proc(void)
309 {
310 snd_info_free_entry(info_entry);
311 info_entry = NULL;
312 }
313 #endif /* CONFIG_SND_PROC_FS */
314