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 <sound/driver.h> 24 #include <linux/init.h> 25 #include <linux/moduleparam.h> 26 #include <linux/mutex.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 #ifdef SNDRV_SEQ_OSS_DEBUG 44 module_param(seq_oss_debug, int, 0644); 45 MODULE_PARM_DESC(seq_oss_debug, "debug option"); 46 int seq_oss_debug = 0; 47 #endif 48 49 50 /* 51 * prototypes 52 */ 53 static int register_device(void); 54 static void unregister_device(void); 55 #ifdef CONFIG_PROC_FS 56 static int register_proc(void); 57 static void unregister_proc(void); 58 #else 59 static inline int register_proc(void) { return 0; } 60 static inline void unregister_proc(void) {} 61 #endif 62 63 static int odev_open(struct inode *inode, struct file *file); 64 static int odev_release(struct inode *inode, struct file *file); 65 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset); 66 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset); 67 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 68 static unsigned int odev_poll(struct file *file, poll_table * wait); 69 70 71 /* 72 * module interface 73 */ 74 75 static int __init alsa_seq_oss_init(void) 76 { 77 int rc; 78 static struct snd_seq_dev_ops ops = { 79 snd_seq_oss_synth_register, 80 snd_seq_oss_synth_unregister, 81 }; 82 83 snd_seq_autoload_lock(); 84 if ((rc = register_device()) < 0) 85 goto error; 86 if ((rc = register_proc()) < 0) { 87 unregister_device(); 88 goto error; 89 } 90 if ((rc = snd_seq_oss_create_client()) < 0) { 91 unregister_proc(); 92 unregister_device(); 93 goto error; 94 } 95 96 if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops, 97 sizeof(struct snd_seq_oss_reg))) < 0) { 98 snd_seq_oss_delete_client(); 99 unregister_proc(); 100 unregister_device(); 101 goto error; 102 } 103 104 /* success */ 105 snd_seq_oss_synth_init(); 106 107 error: 108 snd_seq_autoload_unlock(); 109 return rc; 110 } 111 112 static void __exit alsa_seq_oss_exit(void) 113 { 114 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS); 115 snd_seq_oss_delete_client(); 116 unregister_proc(); 117 unregister_device(); 118 } 119 120 module_init(alsa_seq_oss_init) 121 module_exit(alsa_seq_oss_exit) 122 123 /* 124 * ALSA minor device interface 125 */ 126 127 static DEFINE_MUTEX(register_mutex); 128 129 static int 130 odev_open(struct inode *inode, struct file *file) 131 { 132 int level, rc; 133 134 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC) 135 level = SNDRV_SEQ_OSS_MODE_MUSIC; 136 else 137 level = SNDRV_SEQ_OSS_MODE_SYNTH; 138 139 mutex_lock(®ister_mutex); 140 rc = snd_seq_oss_open(file, level); 141 mutex_unlock(®ister_mutex); 142 143 return rc; 144 } 145 146 static int 147 odev_release(struct inode *inode, struct file *file) 148 { 149 struct seq_oss_devinfo *dp; 150 151 if ((dp = file->private_data) == NULL) 152 return 0; 153 154 snd_seq_oss_drain_write(dp); 155 156 mutex_lock(®ister_mutex); 157 snd_seq_oss_release(dp); 158 mutex_unlock(®ister_mutex); 159 160 return 0; 161 } 162 163 static ssize_t 164 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 165 { 166 struct seq_oss_devinfo *dp; 167 dp = file->private_data; 168 snd_assert(dp != NULL, return -EIO); 169 return snd_seq_oss_read(dp, buf, count); 170 } 171 172 173 static ssize_t 174 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 175 { 176 struct seq_oss_devinfo *dp; 177 dp = file->private_data; 178 snd_assert(dp != NULL, return -EIO); 179 return snd_seq_oss_write(dp, buf, count, file); 180 } 181 182 static long 183 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 184 { 185 struct seq_oss_devinfo *dp; 186 dp = file->private_data; 187 snd_assert(dp != NULL, return -EIO); 188 return snd_seq_oss_ioctl(dp, cmd, arg); 189 } 190 191 #ifdef CONFIG_COMPAT 192 #define odev_ioctl_compat odev_ioctl 193 #else 194 #define odev_ioctl_compat NULL 195 #endif 196 197 static unsigned int 198 odev_poll(struct file *file, poll_table * wait) 199 { 200 struct seq_oss_devinfo *dp; 201 dp = file->private_data; 202 snd_assert(dp != NULL, return 0); 203 return snd_seq_oss_poll(dp, file, wait); 204 } 205 206 /* 207 * registration of sequencer minor device 208 */ 209 210 static const struct file_operations seq_oss_f_ops = 211 { 212 .owner = THIS_MODULE, 213 .read = odev_read, 214 .write = odev_write, 215 .open = odev_open, 216 .release = odev_release, 217 .poll = odev_poll, 218 .unlocked_ioctl = odev_ioctl, 219 .compat_ioctl = odev_ioctl_compat, 220 }; 221 222 static int __init 223 register_device(void) 224 { 225 int rc; 226 227 mutex_lock(®ister_mutex); 228 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, 229 NULL, 0, 230 &seq_oss_f_ops, NULL, 231 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 232 snd_printk(KERN_ERR "can't register device seq\n"); 233 mutex_unlock(®ister_mutex); 234 return rc; 235 } 236 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, 237 NULL, 0, 238 &seq_oss_f_ops, NULL, 239 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 240 snd_printk(KERN_ERR "can't register device music\n"); 241 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0); 242 mutex_unlock(®ister_mutex); 243 return rc; 244 } 245 debug_printk(("device registered\n")); 246 mutex_unlock(®ister_mutex); 247 return 0; 248 } 249 250 static void 251 unregister_device(void) 252 { 253 mutex_lock(®ister_mutex); 254 debug_printk(("device unregistered\n")); 255 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 256 snd_printk(KERN_ERR "error unregister device music\n"); 257 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0) 258 snd_printk(KERN_ERR "error unregister device seq\n"); 259 mutex_unlock(®ister_mutex); 260 } 261 262 /* 263 * /proc interface 264 */ 265 266 #ifdef CONFIG_PROC_FS 267 268 static struct snd_info_entry *info_entry; 269 270 static void 271 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 272 { 273 mutex_lock(®ister_mutex); 274 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR); 275 snd_seq_oss_system_info_read(buf); 276 snd_seq_oss_synth_info_read(buf); 277 snd_seq_oss_midi_info_read(buf); 278 mutex_unlock(®ister_mutex); 279 } 280 281 282 static int __init 283 register_proc(void) 284 { 285 struct snd_info_entry *entry; 286 287 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root); 288 if (entry == NULL) 289 return -ENOMEM; 290 291 entry->content = SNDRV_INFO_CONTENT_TEXT; 292 entry->private_data = NULL; 293 entry->c.text.read = info_read; 294 if (snd_info_register(entry) < 0) { 295 snd_info_free_entry(entry); 296 return -ENOMEM; 297 } 298 info_entry = entry; 299 return 0; 300 } 301 302 static void 303 unregister_proc(void) 304 { 305 snd_info_free_entry(info_entry); 306 info_entry = NULL; 307 } 308 #endif /* CONFIG_PROC_FS */ 309