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 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 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 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 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 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 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 168 odev_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 178 static 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 186 187 static __poll_t 188 odev_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 */ 200 201 static 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 }; 213 214 static int __init 215 register_device(void) 216 { 217 int rc; 218 219 mutex_lock(®ister_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(®ister_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(®ister_mutex); 233 return rc; 234 } 235 mutex_unlock(®ister_mutex); 236 return 0; 237 } 238 239 static void 240 unregister_device(void) 241 { 242 mutex_lock(®ister_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(®ister_mutex); 248 } 249 250 /* 251 * /proc interface 252 */ 253 254 #ifdef CONFIG_SND_PROC_FS 255 256 static struct snd_info_entry *info_entry; 257 258 static void 259 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 260 { 261 mutex_lock(®ister_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(®ister_mutex); 267 } 268 269 270 static int __init 271 register_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 } 289 290 static void 291 unregister_proc(void) 292 { 293 snd_info_free_entry(info_entry); 294 info_entry = NULL; 295 } 296 #endif /* CONFIG_SND_PROC_FS */ 297