1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * OSS compatible sequencer driver
4 *
5 * registration of device and proc
6 *
7 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
8 */
9
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/compat.h>
14 #include <sound/core.h>
15 #include <sound/minors.h>
16 #include <sound/initval.h>
17 #include "seq_oss_device.h"
18 #include "seq_oss_synth.h"
19
20 /*
21 * module option
22 */
23 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
24 MODULE_DESCRIPTION("OSS-compatible sequencer module");
25 MODULE_LICENSE("GPL");
26 /* Takashi says this is really only for sound-service-0-, but this is OK. */
27 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
28 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
29
30
31 /*
32 * prototypes
33 */
34 static int register_device(void);
35 static void unregister_device(void);
36 #ifdef CONFIG_SND_PROC_FS
37 static int register_proc(void);
38 static void unregister_proc(void);
39 #else
register_proc(void)40 static inline int register_proc(void) { return 0; }
unregister_proc(void)41 static inline void unregister_proc(void) {}
42 #endif
43
44 static int odev_open(struct inode *inode, struct file *file);
45 static int odev_release(struct inode *inode, struct file *file);
46 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
47 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
48 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
49 static __poll_t odev_poll(struct file *file, poll_table * wait);
50
51
52 /*
53 * module interface
54 */
55
56 static struct snd_seq_driver seq_oss_synth_driver = {
57 .driver = {
58 .name = KBUILD_MODNAME,
59 .probe = snd_seq_oss_synth_probe,
60 .remove = snd_seq_oss_synth_remove,
61 },
62 .id = SNDRV_SEQ_DEV_ID_OSS,
63 .argsize = sizeof(struct snd_seq_oss_reg),
64 };
65
alsa_seq_oss_init(void)66 static int __init alsa_seq_oss_init(void)
67 {
68 int rc;
69
70 if ((rc = register_device()) < 0)
71 goto error;
72 if ((rc = register_proc()) < 0) {
73 unregister_device();
74 goto error;
75 }
76 if ((rc = snd_seq_oss_create_client()) < 0) {
77 unregister_proc();
78 unregister_device();
79 goto error;
80 }
81
82 rc = snd_seq_driver_register(&seq_oss_synth_driver);
83 if (rc < 0) {
84 snd_seq_oss_delete_client();
85 unregister_proc();
86 unregister_device();
87 goto error;
88 }
89
90 /* success */
91 snd_seq_oss_synth_init();
92
93 error:
94 return rc;
95 }
96
alsa_seq_oss_exit(void)97 static void __exit alsa_seq_oss_exit(void)
98 {
99 snd_seq_driver_unregister(&seq_oss_synth_driver);
100 snd_seq_oss_delete_client();
101 unregister_proc();
102 unregister_device();
103 }
104
105 module_init(alsa_seq_oss_init)
106 module_exit(alsa_seq_oss_exit)
107
108 /*
109 * ALSA minor device interface
110 */
111
112 static DEFINE_MUTEX(register_mutex);
113
114 static int
odev_open(struct inode * inode,struct file * file)115 odev_open(struct inode *inode, struct file *file)
116 {
117 int level, rc;
118
119 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
120 level = SNDRV_SEQ_OSS_MODE_MUSIC;
121 else
122 level = SNDRV_SEQ_OSS_MODE_SYNTH;
123
124 mutex_lock(®ister_mutex);
125 rc = snd_seq_oss_open(file, level);
126 mutex_unlock(®ister_mutex);
127
128 return rc;
129 }
130
131 static int
odev_release(struct inode * inode,struct file * file)132 odev_release(struct inode *inode, struct file *file)
133 {
134 struct seq_oss_devinfo *dp;
135
136 if ((dp = file->private_data) == NULL)
137 return 0;
138
139 mutex_lock(®ister_mutex);
140 snd_seq_oss_release(dp);
141 mutex_unlock(®ister_mutex);
142
143 return 0;
144 }
145
146 static ssize_t
odev_read(struct file * file,char __user * buf,size_t count,loff_t * offset)147 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
148 {
149 struct seq_oss_devinfo *dp;
150 dp = file->private_data;
151 if (snd_BUG_ON(!dp))
152 return -ENXIO;
153 return snd_seq_oss_read(dp, buf, count);
154 }
155
156
157 static ssize_t
odev_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)158 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
159 {
160 struct seq_oss_devinfo *dp;
161 dp = file->private_data;
162 if (snd_BUG_ON(!dp))
163 return -ENXIO;
164 return snd_seq_oss_write(dp, buf, count, file);
165 }
166
167 static long
odev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)168 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
169 {
170 struct seq_oss_devinfo *dp;
171 long rc;
172
173 dp = file->private_data;
174 if (snd_BUG_ON(!dp))
175 return -ENXIO;
176
177 if (cmd != SNDCTL_SEQ_SYNC &&
178 mutex_lock_interruptible(®ister_mutex))
179 return -ERESTARTSYS;
180 rc = snd_seq_oss_ioctl(dp, cmd, arg);
181 if (cmd != SNDCTL_SEQ_SYNC)
182 mutex_unlock(®ister_mutex);
183 return rc;
184 }
185
186 #ifdef CONFIG_COMPAT
odev_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)187 static long odev_ioctl_compat(struct file *file, unsigned int cmd,
188 unsigned long arg)
189 {
190 return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
191 }
192 #else
193 #define odev_ioctl_compat NULL
194 #endif
195
196 static __poll_t
odev_poll(struct file * file,poll_table * wait)197 odev_poll(struct file *file, poll_table * wait)
198 {
199 struct seq_oss_devinfo *dp;
200 dp = file->private_data;
201 if (snd_BUG_ON(!dp))
202 return EPOLLERR;
203 return snd_seq_oss_poll(dp, file, wait);
204 }
205
206 /*
207 * registration of sequencer minor device
208 */
209
210 static const 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 .llseek = noop_llseek,
221 };
222
223 static int __init
register_device(void)224 register_device(void)
225 {
226 int rc;
227
228 mutex_lock(®ister_mutex);
229 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
230 NULL, 0,
231 &seq_oss_f_ops, NULL)) < 0) {
232 pr_err("ALSA: seq_oss: can't register device seq\n");
233 mutex_unlock(®ister_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)) < 0) {
239 pr_err("ALSA: seq_oss: can't register device music\n");
240 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
241 mutex_unlock(®ister_mutex);
242 return rc;
243 }
244 mutex_unlock(®ister_mutex);
245 return 0;
246 }
247
248 static void
unregister_device(void)249 unregister_device(void)
250 {
251 mutex_lock(®ister_mutex);
252 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
253 pr_err("ALSA: seq_oss: error unregister device music\n");
254 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
255 pr_err("ALSA: seq_oss: error unregister device seq\n");
256 mutex_unlock(®ister_mutex);
257 }
258
259 /*
260 * /proc interface
261 */
262
263 #ifdef CONFIG_SND_PROC_FS
264
265 static struct snd_info_entry *info_entry;
266
267 static void
info_read(struct snd_info_entry * entry,struct snd_info_buffer * buf)268 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
269 {
270 mutex_lock(®ister_mutex);
271 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
272 snd_seq_oss_system_info_read(buf);
273 snd_seq_oss_synth_info_read(buf);
274 snd_seq_oss_midi_info_read(buf);
275 mutex_unlock(®ister_mutex);
276 }
277
278
279 static int __init
register_proc(void)280 register_proc(void)
281 {
282 struct snd_info_entry *entry;
283
284 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
285 if (entry == NULL)
286 return -ENOMEM;
287
288 entry->content = SNDRV_INFO_CONTENT_TEXT;
289 entry->private_data = NULL;
290 entry->c.text.read = info_read;
291 if (snd_info_register(entry) < 0) {
292 snd_info_free_entry(entry);
293 return -ENOMEM;
294 }
295 info_entry = entry;
296 return 0;
297 }
298
299 static void
unregister_proc(void)300 unregister_proc(void)
301 {
302 snd_info_free_entry(info_entry);
303 info_entry = NULL;
304 }
305 #endif /* CONFIG_SND_PROC_FS */
306