c98f0ba13810d7a6c1cf7d0483a5933f33be9f9a
[linux-2.6.git] / sound / core / seq / oss / seq_oss.c
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 <sound/driver.h>
24 #include <linux/init.h>
25 #include <linux/smp_lock.h>
26 #include <linux/moduleparam.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/initval.h>
30 #include "seq_oss_device.h"
31 #include "seq_oss_synth.h"
32
33 /*
34  * module option
35  */
36 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
37 MODULE_DESCRIPTION("OSS-compatible sequencer module");
38 MODULE_LICENSE("GPL");
39 /* Takashi says this is really only for sound-service-0-, but this is OK. */
40 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
41 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
42
43 #ifdef SNDRV_SEQ_OSS_DEBUG
44 module_param(seq_oss_debug, int, 0644);
45 MODULE_PARM_DESC(seq_oss_debug, "debug option");
46 int seq_oss_debug = 0;
47 #endif
48
49
50 /*
51  * prototypes
52  */
53 static int register_device(void);
54 static void unregister_device(void);
55 #ifdef CONFIG_PROC_FS
56 static int register_proc(void);
57 static void unregister_proc(void);
58 #else
59 static inline int register_proc(void) { return 0; }
60 static inline void unregister_proc(void) {}
61 #endif
62
63 static int odev_open(struct inode *inode, struct file *file);
64 static int odev_release(struct inode *inode, struct file *file);
65 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
66 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
67 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
68 static unsigned int odev_poll(struct file *file, poll_table * wait);
69
70
71 /*
72  * module interface
73  */
74
75 static int __init alsa_seq_oss_init(void)
76 {
77         int rc;
78         static struct snd_seq_dev_ops ops = {
79                 snd_seq_oss_synth_register,
80                 snd_seq_oss_synth_unregister,
81         };
82
83         snd_seq_autoload_lock();
84         if ((rc = register_device()) < 0)
85                 goto error;
86         if ((rc = register_proc()) < 0) {
87                 unregister_device();
88                 goto error;
89         }
90         if ((rc = snd_seq_oss_create_client()) < 0) {
91                 unregister_proc();
92                 unregister_device();
93                 goto error;
94         }
95
96         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
97                                                  sizeof(struct snd_seq_oss_reg))) < 0) {
98                 snd_seq_oss_delete_client();
99                 unregister_proc();
100                 unregister_device();
101                 goto error;
102         }
103
104         /* success */
105         snd_seq_oss_synth_init();
106
107  error:
108         snd_seq_autoload_unlock();
109         return rc;
110 }
111
112 static void __exit alsa_seq_oss_exit(void)
113 {
114         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
115         snd_seq_oss_delete_client();
116         unregister_proc();
117         unregister_device();
118 }
119
120 module_init(alsa_seq_oss_init)
121 module_exit(alsa_seq_oss_exit)
122
123 /*
124  * ALSA minor device interface
125  */
126
127 static DECLARE_MUTEX(register_mutex);
128
129 static int
130 odev_open(struct inode *inode, struct file *file)
131 {
132         int level, rc;
133
134         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
135                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
136         else
137                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
138
139         down(&register_mutex);
140         rc = snd_seq_oss_open(file, level);
141         up(&register_mutex);
142
143         return rc;
144 }
145
146 static int
147 odev_release(struct inode *inode, struct file *file)
148 {
149         struct seq_oss_devinfo *dp;
150
151         if ((dp = file->private_data) == NULL)
152                 return 0;
153
154         snd_seq_oss_drain_write(dp);
155
156         down(&register_mutex);
157         snd_seq_oss_release(dp);
158         up(&register_mutex);
159
160         return 0;
161 }
162
163 static ssize_t
164 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
165 {
166         struct seq_oss_devinfo *dp;
167         dp = file->private_data;
168         snd_assert(dp != NULL, return -EIO);
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         snd_assert(dp != NULL, return -EIO);
179         return snd_seq_oss_write(dp, buf, count, file);
180 }
181
182 static long
183 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
184 {
185         struct seq_oss_devinfo *dp;
186         dp = file->private_data;
187         snd_assert(dp != NULL, return -EIO);
188         return snd_seq_oss_ioctl(dp, cmd, arg);
189 }
190
191 #ifdef CONFIG_COMPAT
192 #define odev_ioctl_compat       odev_ioctl
193 #else
194 #define odev_ioctl_compat       NULL
195 #endif
196
197 static unsigned int
198 odev_poll(struct file *file, poll_table * wait)
199 {
200         struct seq_oss_devinfo *dp;
201         dp = file->private_data;
202         snd_assert(dp != NULL, return 0);
203         return snd_seq_oss_poll(dp, file, wait);
204 }
205
206 /*
207  * registration of sequencer minor device
208  */
209
210 static struct file_operations seq_oss_f_ops =
211 {
212         .owner =        THIS_MODULE,
213         .read =         odev_read,
214         .write =        odev_write,
215         .open =         odev_open,
216         .release =      odev_release,
217         .poll =         odev_poll,
218         .unlocked_ioctl =       odev_ioctl,
219         .compat_ioctl = odev_ioctl_compat,
220 };
221
222 static int __init
223 register_device(void)
224 {
225         int rc;
226
227         down(&register_mutex);
228         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
229                                           NULL, 0,
230                                           &seq_oss_f_ops, NULL,
231                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
232                 snd_printk(KERN_ERR "can't register device seq\n");
233                 up(&register_mutex);
234                 return rc;
235         }
236         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
237                                           NULL, 0,
238                                           &seq_oss_f_ops, NULL,
239                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
240                 snd_printk(KERN_ERR "can't register device music\n");
241                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
242                 up(&register_mutex);
243                 return rc;
244         }
245         debug_printk(("device registered\n"));
246         up(&register_mutex);
247         return 0;
248 }
249
250 static void
251 unregister_device(void)
252 {
253         down(&register_mutex);
254         debug_printk(("device unregistered\n"));
255         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)                
256                 snd_printk(KERN_ERR "error unregister device music\n");
257         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
258                 snd_printk(KERN_ERR "error unregister device seq\n");
259         up(&register_mutex);
260 }
261
262 /*
263  * /proc interface
264  */
265
266 #ifdef CONFIG_PROC_FS
267
268 static struct snd_info_entry *info_entry;
269
270 static void
271 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
272 {
273         down(&register_mutex);
274         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
275         snd_seq_oss_system_info_read(buf);
276         snd_seq_oss_synth_info_read(buf);
277         snd_seq_oss_midi_info_read(buf);
278         up(&register_mutex);
279 }
280
281
282 static int __init
283 register_proc(void)
284 {
285         struct snd_info_entry *entry;
286
287         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
288         if (entry == NULL)
289                 return -ENOMEM;
290
291         entry->content = SNDRV_INFO_CONTENT_TEXT;
292         entry->private_data = NULL;
293         entry->c.text.read_size = 1024;
294         entry->c.text.read = info_read;
295         if (snd_info_register(entry) < 0) {
296                 snd_info_free_entry(entry);
297                 return -ENOMEM;
298         }
299         info_entry = entry;
300         return 0;
301 }
302
303 static void
304 unregister_proc(void)
305 {
306         if (info_entry)
307                 snd_info_unregister(info_entry);
308         info_entry = NULL;
309 }
310 #endif /* CONFIG_PROC_FS */