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	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
 97static 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
105module_init(alsa_seq_oss_init)
106module_exit(alsa_seq_oss_exit)
107
108/*
109 * ALSA minor device interface
110 */
111
112static DEFINE_MUTEX(register_mutex);
113
114static int
115odev_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(&register_mutex);
125	rc = snd_seq_oss_open(file, level);
126	mutex_unlock(&register_mutex);
127
128	return rc;
129}
130
131static int
132odev_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(&register_mutex);
140	snd_seq_oss_release(dp);
141	mutex_unlock(&register_mutex);
142
143	return 0;
144}
145
146static ssize_t
147odev_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
157static ssize_t
158odev_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
167static long
168odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
169{
170	struct seq_oss_devinfo *dp;
 
 
171	dp = file->private_data;
172	if (snd_BUG_ON(!dp))
173		return -ENXIO;
174	return snd_seq_oss_ioctl(dp, cmd, arg);
 
 
 
 
 
 
 
175}
176
177#ifdef CONFIG_COMPAT
178static long odev_ioctl_compat(struct file *file, unsigned int cmd,
179			      unsigned long arg)
180{
181	return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
182}
183#else
184#define odev_ioctl_compat	NULL
185#endif
186
187static __poll_t
188odev_poll(struct file *file, poll_table * wait)
189{
190	struct seq_oss_devinfo *dp;
191	dp = file->private_data;
192	if (snd_BUG_ON(!dp))
193		return EPOLLERR;
194	return snd_seq_oss_poll(dp, file, wait);
195}
196
197/*
198 * registration of sequencer minor device
199 */
200
201static const struct file_operations seq_oss_f_ops =
202{
203	.owner =	THIS_MODULE,
204	.read =		odev_read,
205	.write =	odev_write,
206	.open =		odev_open,
207	.release =	odev_release,
208	.poll =		odev_poll,
209	.unlocked_ioctl =	odev_ioctl,
210	.compat_ioctl =	odev_ioctl_compat,
211	.llseek =	noop_llseek,
212};
213
214static int __init
215register_device(void)
216{
217	int rc;
218
219	mutex_lock(&register_mutex);
220	if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
221					  NULL, 0,
222					  &seq_oss_f_ops, NULL)) < 0) {
 
223		pr_err("ALSA: seq_oss: can't register device seq\n");
224		mutex_unlock(&register_mutex);
225		return rc;
226	}
227	if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
228					  NULL, 0,
229					  &seq_oss_f_ops, NULL)) < 0) {
 
230		pr_err("ALSA: seq_oss: can't register device music\n");
231		snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
232		mutex_unlock(&register_mutex);
233		return rc;
234	}
235	mutex_unlock(&register_mutex);
236	return 0;
237}
238
239static void
240unregister_device(void)
241{
242	mutex_lock(&register_mutex);
243	if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)		
244		pr_err("ALSA: seq_oss: error unregister device music\n");
245	if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
246		pr_err("ALSA: seq_oss: error unregister device seq\n");
247	mutex_unlock(&register_mutex);
248}
249
250/*
251 * /proc interface
252 */
253
254#ifdef CONFIG_SND_PROC_FS
255
256static struct snd_info_entry *info_entry;
257
258static void
259info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
260{
261	mutex_lock(&register_mutex);
262	snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
263	snd_seq_oss_system_info_read(buf);
264	snd_seq_oss_synth_info_read(buf);
265	snd_seq_oss_midi_info_read(buf);
266	mutex_unlock(&register_mutex);
267}
268
269
270static int __init
271register_proc(void)
272{
273	struct snd_info_entry *entry;
274
275	entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
276	if (entry == NULL)
277		return -ENOMEM;
278
279	entry->content = SNDRV_INFO_CONTENT_TEXT;
280	entry->private_data = NULL;
281	entry->c.text.read = info_read;
282	if (snd_info_register(entry) < 0) {
283		snd_info_free_entry(entry);
284		return -ENOMEM;
285	}
286	info_entry = entry;
287	return 0;
288}
289
290static void
291unregister_proc(void)
292{
293	snd_info_free_entry(info_entry);
294	info_entry = NULL;
295}
296#endif /* CONFIG_SND_PROC_FS */

  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 */