1 /* 2 * OSS compatible sequencer driver 3 * 4 * registration of device and proc 5 * 6 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/init.h> 24 #include <linux/module.h> 25 #include <linux/mutex.h> 26 #include <linux/compat.h> 27 #include <sound/core.h> 28 #include <sound/minors.h> 29 #include <sound/initval.h> 30 #include "seq_oss_device.h" 31 #include "seq_oss_synth.h" 32 33 /* 34 * module option 35 */ 36 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 37 MODULE_DESCRIPTION("OSS-compatible sequencer module"); 38 MODULE_LICENSE("GPL"); 39 /* Takashi says this is really only for sound-service-0-, but this is OK. */ 40 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER); 41 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC); 42 43 44 /* 45 * prototypes 46 */ 47 static int register_device(void); 48 static void unregister_device(void); 49 #ifdef CONFIG_SND_PROC_FS 50 static int register_proc(void); 51 static void unregister_proc(void); 52 #else 53 static inline int register_proc(void) { return 0; } 54 static inline void unregister_proc(void) {} 55 #endif 56 57 static int odev_open(struct inode *inode, struct file *file); 58 static int odev_release(struct inode *inode, struct file *file); 59 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset); 60 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset); 61 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 62 static __poll_t odev_poll(struct file *file, poll_table * wait); 63 64 65 /* 66 * module interface 67 */ 68 69 static struct snd_seq_driver seq_oss_synth_driver = { 70 .driver = { 71 .name = KBUILD_MODNAME, 72 .probe = snd_seq_oss_synth_probe, 73 .remove = snd_seq_oss_synth_remove, 74 }, 75 .id = SNDRV_SEQ_DEV_ID_OSS, 76 .argsize = sizeof(struct snd_seq_oss_reg), 77 }; 78 79 static int __init alsa_seq_oss_init(void) 80 { 81 int rc; 82 83 if ((rc = register_device()) < 0) 84 goto error; 85 if ((rc = register_proc()) < 0) { 86 unregister_device(); 87 goto error; 88 } 89 if ((rc = snd_seq_oss_create_client()) < 0) { 90 unregister_proc(); 91 unregister_device(); 92 goto error; 93 } 94 95 rc = snd_seq_driver_register(&seq_oss_synth_driver); 96 if (rc < 0) { 97 snd_seq_oss_delete_client(); 98 unregister_proc(); 99 unregister_device(); 100 goto error; 101 } 102 103 /* success */ 104 snd_seq_oss_synth_init(); 105 106 error: 107 return rc; 108 } 109 110 static void __exit alsa_seq_oss_exit(void) 111 { 112 snd_seq_driver_unregister(&seq_oss_synth_driver); 113 snd_seq_oss_delete_client(); 114 unregister_proc(); 115 unregister_device(); 116 } 117 118 module_init(alsa_seq_oss_init) 119 module_exit(alsa_seq_oss_exit) 120 121 /* 122 * ALSA minor device interface 123 */ 124 125 static DEFINE_MUTEX(register_mutex); 126 127 static int 128 odev_open(struct inode *inode, struct file *file) 129 { 130 int level, rc; 131 132 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC) 133 level = SNDRV_SEQ_OSS_MODE_MUSIC; 134 else 135 level = SNDRV_SEQ_OSS_MODE_SYNTH; 136 137 mutex_lock(®ister_mutex); 138 rc = snd_seq_oss_open(file, level); 139 mutex_unlock(®ister_mutex); 140 141 return rc; 142 } 143 144 static int 145 odev_release(struct inode *inode, struct file *file) 146 { 147 struct seq_oss_devinfo *dp; 148 149 if ((dp = file->private_data) == NULL) 150 return 0; 151 152 mutex_lock(®ister_mutex); 153 snd_seq_oss_release(dp); 154 mutex_unlock(®ister_mutex); 155 156 return 0; 157 } 158 159 static ssize_t 160 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 161 { 162 struct seq_oss_devinfo *dp; 163 dp = file->private_data; 164 if (snd_BUG_ON(!dp)) 165 return -ENXIO; 166 return snd_seq_oss_read(dp, buf, count); 167 } 168 169 170 static ssize_t 171 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 172 { 173 struct seq_oss_devinfo *dp; 174 dp = file->private_data; 175 if (snd_BUG_ON(!dp)) 176 return -ENXIO; 177 return snd_seq_oss_write(dp, buf, count, file); 178 } 179 180 static long 181 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 182 { 183 struct seq_oss_devinfo *dp; 184 dp = file->private_data; 185 if (snd_BUG_ON(!dp)) 186 return -ENXIO; 187 return snd_seq_oss_ioctl(dp, cmd, arg); 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 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, 234 NULL, 0, 235 &seq_oss_f_ops, NULL)) < 0) { 236 pr_err("ALSA: seq_oss: can't register device seq\n"); 237 mutex_unlock(®ister_mutex); 238 return rc; 239 } 240 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, 241 NULL, 0, 242 &seq_oss_f_ops, NULL)) < 0) { 243 pr_err("ALSA: seq_oss: can't register device music\n"); 244 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0); 245 mutex_unlock(®ister_mutex); 246 return rc; 247 } 248 mutex_unlock(®ister_mutex); 249 return 0; 250 } 251 252 static void 253 unregister_device(void) 254 { 255 mutex_lock(®ister_mutex); 256 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 257 pr_err("ALSA: seq_oss: error unregister device music\n"); 258 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0) 259 pr_err("ALSA: seq_oss: error unregister device seq\n"); 260 mutex_unlock(®ister_mutex); 261 } 262 263 /* 264 * /proc interface 265 */ 266 267 #ifdef CONFIG_SND_PROC_FS 268 269 static struct snd_info_entry *info_entry; 270 271 static void 272 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 273 { 274 mutex_lock(®ister_mutex); 275 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR); 276 snd_seq_oss_system_info_read(buf); 277 snd_seq_oss_synth_info_read(buf); 278 snd_seq_oss_midi_info_read(buf); 279 mutex_unlock(®ister_mutex); 280 } 281 282 283 static int __init 284 register_proc(void) 285 { 286 struct snd_info_entry *entry; 287 288 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root); 289 if (entry == NULL) 290 return -ENOMEM; 291 292 entry->content = SNDRV_INFO_CONTENT_TEXT; 293 entry->private_data = NULL; 294 entry->c.text.read = info_read; 295 if (snd_info_register(entry) < 0) { 296 snd_info_free_entry(entry); 297 return -ENOMEM; 298 } 299 info_entry = entry; 300 return 0; 301 } 302 303 static void 304 unregister_proc(void) 305 { 306 snd_info_free_entry(info_entry); 307 info_entry = NULL; 308 } 309 #endif /* CONFIG_SND_PROC_FS */ 310