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 40 static inline int register_proc(void) { return 0; } 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 66 static 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 } 99 100 static 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 } 107 108 module_init(alsa_seq_oss_init) 109 module_exit(alsa_seq_oss_exit) 110 111 /* 112 * ALSA minor device interface 113 */ 114 115 static DEFINE_MUTEX(register_mutex); 116 117 static int 118 odev_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(®ister_mutex); 128 rc = snd_seq_oss_open(file, level); 129 mutex_unlock(®ister_mutex); 130 131 return rc; 132 } 133 134 static int 135 odev_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(®ister_mutex); 144 snd_seq_oss_release(dp); 145 mutex_unlock(®ister_mutex); 146 147 return 0; 148 } 149 150 static ssize_t 151 odev_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 } 159 160 161 static ssize_t 162 odev_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 } 170 171 static long 172 odev_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(®ister_mutex)) 183 return -ERESTARTSYS; 184 rc = snd_seq_oss_ioctl(dp, cmd, arg); 185 if (cmd != SNDCTL_SEQ_SYNC) 186 mutex_unlock(®ister_mutex); 187 return rc; 188 } 189 190 #ifdef CONFIG_COMPAT 191 static 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 199 200 static __poll_t 201 odev_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 */ 213 214 static 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 }; 226 227 static int __init 228 register_device(void) 229 { 230 int rc; 231 232 mutex_lock(®ister_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(®ister_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(®ister_mutex); 248 return rc; 249 } 250 mutex_unlock(®ister_mutex); 251 return 0; 252 } 253 254 static void 255 unregister_device(void) 256 { 257 mutex_lock(®ister_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(®ister_mutex); 263 } 264 265 /* 266 * /proc interface 267 */ 268 269 #ifdef CONFIG_SND_PROC_FS 270 271 static struct snd_info_entry *info_entry; 272 273 static void 274 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 275 { 276 mutex_lock(®ister_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(®ister_mutex); 282 } 283 284 285 static int __init 286 register_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 } 304 305 static void 306 unregister_proc(void) 307 { 308 snd_info_free_entry(info_entry); 309 info_entry = NULL; 310 } 311 #endif /* CONFIG_SND_PROC_FS */ 312