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; 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 guard(mutex)(®ister_mutex); 128 return snd_seq_oss_open(file, level); 129 } 130 131 static int 132 odev_release(struct inode *inode, struct file *file) 133 { 134 struct seq_oss_devinfo *dp; 135 136 dp = file->private_data; 137 if (!dp) 138 return 0; 139 140 guard(mutex)(®ister_mutex); 141 snd_seq_oss_release(dp); 142 return 0; 143 } 144 145 static ssize_t 146 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 147 { 148 struct seq_oss_devinfo *dp; 149 dp = file->private_data; 150 if (snd_BUG_ON(!dp)) 151 return -ENXIO; 152 return snd_seq_oss_read(dp, buf, count); 153 } 154 155 156 static ssize_t 157 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 158 { 159 struct seq_oss_devinfo *dp; 160 dp = file->private_data; 161 if (snd_BUG_ON(!dp)) 162 return -ENXIO; 163 return snd_seq_oss_write(dp, buf, count, file); 164 } 165 166 static long 167 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 168 { 169 struct seq_oss_devinfo *dp; 170 long rc; 171 172 dp = file->private_data; 173 if (snd_BUG_ON(!dp)) 174 return -ENXIO; 175 176 if (cmd != SNDCTL_SEQ_SYNC && 177 mutex_lock_interruptible(®ister_mutex)) 178 return -ERESTARTSYS; 179 rc = snd_seq_oss_ioctl(dp, cmd, arg); 180 if (cmd != SNDCTL_SEQ_SYNC) 181 mutex_unlock(®ister_mutex); 182 return rc; 183 } 184 185 #ifdef CONFIG_COMPAT 186 static long odev_ioctl_compat(struct file *file, unsigned int cmd, 187 unsigned long arg) 188 { 189 return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 190 } 191 #else 192 #define odev_ioctl_compat NULL 193 #endif 194 195 static __poll_t 196 odev_poll(struct file *file, poll_table * wait) 197 { 198 struct seq_oss_devinfo *dp; 199 dp = file->private_data; 200 if (snd_BUG_ON(!dp)) 201 return EPOLLERR; 202 return snd_seq_oss_poll(dp, file, wait); 203 } 204 205 /* 206 * registration of sequencer minor device 207 */ 208 209 static const struct file_operations seq_oss_f_ops = 210 { 211 .owner = THIS_MODULE, 212 .read = odev_read, 213 .write = odev_write, 214 .open = odev_open, 215 .release = odev_release, 216 .poll = odev_poll, 217 .unlocked_ioctl = odev_ioctl, 218 .compat_ioctl = odev_ioctl_compat, 219 .llseek = noop_llseek, 220 }; 221 222 static int __init 223 register_device(void) 224 { 225 int rc; 226 227 guard(mutex)(®ister_mutex); 228 rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, 229 NULL, 0, 230 &seq_oss_f_ops, NULL); 231 if (rc < 0) { 232 pr_err("ALSA: seq_oss: can't register device seq\n"); 233 return rc; 234 } 235 rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, 236 NULL, 0, 237 &seq_oss_f_ops, NULL); 238 if (rc < 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 return rc; 242 } 243 return 0; 244 } 245 246 static void 247 unregister_device(void) 248 { 249 guard(mutex)(®ister_mutex); 250 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 251 pr_err("ALSA: seq_oss: error unregister device music\n"); 252 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0) 253 pr_err("ALSA: seq_oss: error unregister device seq\n"); 254 } 255 256 /* 257 * /proc interface 258 */ 259 260 #ifdef CONFIG_SND_PROC_FS 261 262 static struct snd_info_entry *info_entry; 263 264 static void 265 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 266 { 267 guard(mutex)(®ister_mutex); 268 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR); 269 snd_seq_oss_system_info_read(buf); 270 snd_seq_oss_synth_info_read(buf); 271 snd_seq_oss_midi_info_read(buf); 272 } 273 274 275 static int __init 276 register_proc(void) 277 { 278 struct snd_info_entry *entry; 279 280 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root); 281 if (entry == NULL) 282 return -ENOMEM; 283 284 entry->content = SNDRV_INFO_CONTENT_TEXT; 285 entry->private_data = NULL; 286 entry->c.text.read = info_read; 287 if (snd_info_register(entry) < 0) { 288 snd_info_free_entry(entry); 289 return -ENOMEM; 290 } 291 info_entry = entry; 292 return 0; 293 } 294 295 static void 296 unregister_proc(void) 297 { 298 snd_info_free_entry(info_entry); 299 info_entry = NULL; 300 } 301 #endif /* CONFIG_SND_PROC_FS */ 302