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 */
23MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
24MODULE_DESCRIPTION("OSS-compatible sequencer module");
25MODULE_LICENSE("GPL");
26/* Takashi says this is really only for sound-service-0-, but this is OK. */
27MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
28MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
29
30
31/*
32 * prototypes
33 */
34static int register_device(void);
35static void unregister_device(void);
36#ifdef CONFIG_SND_PROC_FS
37static int register_proc(void);
38static void unregister_proc(void);
39#else
40static inline int register_proc(void) { return 0; }
41static inline void unregister_proc(void) {}
42#endif
43
44static int odev_open(struct inode *inode, struct file *file);
45static int odev_release(struct inode *inode, struct file *file);
46static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
47static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
48static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
49static __poll_t odev_poll(struct file *file, poll_table * wait);
50
51
52/*
53 * module interface
54 */
55
56static 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
66static int __init alsa_seq_oss_init(void)
67{
68	int rc;
69
70	rc = register_device();
71	if (rc < 0)
72		goto error;
73	rc = register_proc();
74	if (rc < 0) {
75		unregister_device();
76		goto error;
77	}
78	rc = snd_seq_oss_create_client();
79	if (rc < 0) {
80		unregister_proc();
81		unregister_device();
82		goto error;
83	}
84
85	rc = snd_seq_driver_register(&seq_oss_synth_driver);
86	if (rc < 0) {
87		snd_seq_oss_delete_client();
88		unregister_proc();
89		unregister_device();
90		goto error;
91	}
92
93	/* success */
94	snd_seq_oss_synth_init();
95
96 error:
97	return rc;
98}
99
100static void __exit alsa_seq_oss_exit(void)
101{
102	snd_seq_driver_unregister(&seq_oss_synth_driver);
103	snd_seq_oss_delete_client();
104	unregister_proc();
105	unregister_device();
106}
107
108module_init(alsa_seq_oss_init)
109module_exit(alsa_seq_oss_exit)
110
111/*
112 * ALSA minor device interface
113 */
114
115static DEFINE_MUTEX(register_mutex);
116
117static int
118odev_open(struct inode *inode, struct file *file)
119{
120	int level, rc;
121
122	if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
123		level = SNDRV_SEQ_OSS_MODE_MUSIC;
124	else
125		level = SNDRV_SEQ_OSS_MODE_SYNTH;
126
127	mutex_lock(&register_mutex);
128	rc = snd_seq_oss_open(file, level);
129	mutex_unlock(&register_mutex);
130
131	return rc;
132}
133
134static int
135odev_release(struct inode *inode, struct file *file)
136{
137	struct seq_oss_devinfo *dp;
138
139	dp = file->private_data;
140	if (!dp)
141		return 0;
142
143	mutex_lock(&register_mutex);
144	snd_seq_oss_release(dp);
145	mutex_unlock(&register_mutex);
146
147	return 0;
148}
149
150static ssize_t
151odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
152{
153	struct seq_oss_devinfo *dp;
154	dp = file->private_data;
155	if (snd_BUG_ON(!dp))
156		return -ENXIO;
157	return snd_seq_oss_read(dp, buf, count);
158}
159
160
161static ssize_t
162odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
163{
164	struct seq_oss_devinfo *dp;
165	dp = file->private_data;
166	if (snd_BUG_ON(!dp))
167		return -ENXIO;
168	return snd_seq_oss_write(dp, buf, count, file);
169}
170
171static long
172odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
173{
174	struct seq_oss_devinfo *dp;
175	long rc;
176
177	dp = file->private_data;
178	if (snd_BUG_ON(!dp))
179		return -ENXIO;
180
181	if (cmd != SNDCTL_SEQ_SYNC &&
182	    mutex_lock_interruptible(&register_mutex))
183		return -ERESTARTSYS;
184	rc = snd_seq_oss_ioctl(dp, cmd, arg);
185	if (cmd != SNDCTL_SEQ_SYNC)
186		mutex_unlock(&register_mutex);
187	return rc;
188}
189
190#ifdef CONFIG_COMPAT
191static long odev_ioctl_compat(struct file *file, unsigned int cmd,
192			      unsigned long arg)
193{
194	return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
195}
196#else
197#define odev_ioctl_compat	NULL
198#endif
199
200static __poll_t
201odev_poll(struct file *file, poll_table * wait)
202{
203	struct seq_oss_devinfo *dp;
204	dp = file->private_data;
205	if (snd_BUG_ON(!dp))
206		return EPOLLERR;
207	return snd_seq_oss_poll(dp, file, wait);
208}
209
210/*
211 * registration of sequencer minor device
212 */
213
214static const struct file_operations seq_oss_f_ops =
215{
216	.owner =	THIS_MODULE,
217	.read =		odev_read,
218	.write =	odev_write,
219	.open =		odev_open,
220	.release =	odev_release,
221	.poll =		odev_poll,
222	.unlocked_ioctl =	odev_ioctl,
223	.compat_ioctl =	odev_ioctl_compat,
224	.llseek =	noop_llseek,
225};
226
227static int __init
228register_device(void)
229{
230	int rc;
231
232	mutex_lock(&register_mutex);
233	rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
234				     NULL, 0,
235				     &seq_oss_f_ops, NULL);
236	if (rc < 0) {
237		pr_err("ALSA: seq_oss: can't register device seq\n");
238		mutex_unlock(&register_mutex);
239		return rc;
240	}
241	rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
242				     NULL, 0,
243				     &seq_oss_f_ops, NULL);
244	if (rc < 0) {
245		pr_err("ALSA: seq_oss: can't register device music\n");
246		snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
247		mutex_unlock(&register_mutex);
248		return rc;
249	}
250	mutex_unlock(&register_mutex);
251	return 0;
252}
253
254static void
255unregister_device(void)
256{
257	mutex_lock(&register_mutex);
258	if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
259		pr_err("ALSA: seq_oss: error unregister device music\n");
260	if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
261		pr_err("ALSA: seq_oss: error unregister device seq\n");
262	mutex_unlock(&register_mutex);
263}
264
265/*
266 * /proc interface
267 */
268
269#ifdef CONFIG_SND_PROC_FS
270
271static struct snd_info_entry *info_entry;
272
273static void
274info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
275{
276	mutex_lock(&register_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(&register_mutex);
282}
283
284
285static int __init
286register_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
305static void
306unregister_proc(void)
307{
308	snd_info_free_entry(info_entry);
309	info_entry = NULL;
310}
311#endif /* CONFIG_SND_PROC_FS */
312