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/smp_lock.h> 26 #include <linux/moduleparam.h> 27 #include <linux/mutex.h> 28 #include <sound/core.h> 29 #include <sound/minors.h> 30 #include <sound/initval.h> 31 #include "seq_oss_device.h" 32 #include "seq_oss_synth.h" 33 34 /* 35 * module option 36 */ 37 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 38 MODULE_DESCRIPTION("OSS-compatible sequencer module"); 39 MODULE_LICENSE("GPL"); 40 /* Takashi says this is really only for sound-service-0-, but this is OK. */ 41 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER); 42 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC); 43 44 #ifdef SNDRV_SEQ_OSS_DEBUG 45 module_param(seq_oss_debug, int, 0644); 46 MODULE_PARM_DESC(seq_oss_debug, "debug option"); 47 int seq_oss_debug = 0; 48 #endif 49 50 51 /* 52 * prototypes 53 */ 54 static int register_device(void); 55 static void unregister_device(void); 56 #ifdef CONFIG_PROC_FS 57 static int register_proc(void); 58 static void unregister_proc(void); 59 #else 60 static inline int register_proc(void) { return 0; } 61 static inline void unregister_proc(void) {} 62 #endif 63 64 static int odev_open(struct inode *inode, struct file *file); 65 static int odev_release(struct inode *inode, struct file *file); 66 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset); 67 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset); 68 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 69 static unsigned int odev_poll(struct file *file, poll_table * wait); 70 71 72 /* 73 * module interface 74 */ 75 76 static int __init alsa_seq_oss_init(void) 77 { 78 int rc; 79 static struct snd_seq_dev_ops ops = { 80 snd_seq_oss_synth_register, 81 snd_seq_oss_synth_unregister, 82 }; 83 84 snd_seq_autoload_lock(); 85 if ((rc = register_device()) < 0) 86 goto error; 87 if ((rc = register_proc()) < 0) { 88 unregister_device(); 89 goto error; 90 } 91 if ((rc = snd_seq_oss_create_client()) < 0) { 92 unregister_proc(); 93 unregister_device(); 94 goto error; 95 } 96 97 if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops, 98 sizeof(struct snd_seq_oss_reg))) < 0) { 99 snd_seq_oss_delete_client(); 100 unregister_proc(); 101 unregister_device(); 102 goto error; 103 } 104 105 /* success */ 106 snd_seq_oss_synth_init(); 107 108 error: 109 snd_seq_autoload_unlock(); 110 return rc; 111 } 112 113 static void __exit alsa_seq_oss_exit(void) 114 { 115 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS); 116 snd_seq_oss_delete_client(); 117 unregister_proc(); 118 unregister_device(); 119 } 120 121 module_init(alsa_seq_oss_init) 122 module_exit(alsa_seq_oss_exit) 123 124 /* 125 * ALSA minor device interface 126 */ 127 128 static DEFINE_MUTEX(register_mutex); 129 130 static int 131 odev_open(struct inode *inode, struct file *file) 132 { 133 int level, rc; 134 135 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC) 136 level = SNDRV_SEQ_OSS_MODE_MUSIC; 137 else 138 level = SNDRV_SEQ_OSS_MODE_SYNTH; 139 140 mutex_lock(®ister_mutex); 141 rc = snd_seq_oss_open(file, level); 142 mutex_unlock(®ister_mutex); 143 144 return rc; 145 } 146 147 static int 148 odev_release(struct inode *inode, struct file *file) 149 { 150 struct seq_oss_devinfo *dp; 151 152 if ((dp = file->private_data) == NULL) 153 return 0; 154 155 snd_seq_oss_drain_write(dp); 156 157 mutex_lock(®ister_mutex); 158 snd_seq_oss_release(dp); 159 mutex_unlock(®ister_mutex); 160 161 return 0; 162 } 163 164 static ssize_t 165 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 166 { 167 struct seq_oss_devinfo *dp; 168 dp = file->private_data; 169 snd_assert(dp != NULL, return -EIO); 170 return snd_seq_oss_read(dp, buf, count); 171 } 172 173 174 static ssize_t 175 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 176 { 177 struct seq_oss_devinfo *dp; 178 dp = file->private_data; 179 snd_assert(dp != NULL, return -EIO); 180 return snd_seq_oss_write(dp, buf, count, file); 181 } 182 183 static long 184 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 185 { 186 struct seq_oss_devinfo *dp; 187 dp = file->private_data; 188 snd_assert(dp != NULL, return -EIO); 189 return snd_seq_oss_ioctl(dp, cmd, arg); 190 } 191 192 #ifdef CONFIG_COMPAT 193 #define odev_ioctl_compat odev_ioctl 194 #else 195 #define odev_ioctl_compat NULL 196 #endif 197 198 static unsigned int 199 odev_poll(struct file *file, poll_table * wait) 200 { 201 struct seq_oss_devinfo *dp; 202 dp = file->private_data; 203 snd_assert(dp != NULL, return 0); 204 return snd_seq_oss_poll(dp, file, wait); 205 } 206 207 /* 208 * registration of sequencer minor device 209 */ 210 211 static struct file_operations seq_oss_f_ops = 212 { 213 .owner = THIS_MODULE, 214 .read = odev_read, 215 .write = odev_write, 216 .open = odev_open, 217 .release = odev_release, 218 .poll = odev_poll, 219 .unlocked_ioctl = odev_ioctl, 220 .compat_ioctl = odev_ioctl_compat, 221 }; 222 223 static int __init 224 register_device(void) 225 { 226 int rc; 227 228 mutex_lock(®ister_mutex); 229 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, 230 NULL, 0, 231 &seq_oss_f_ops, NULL, 232 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 233 snd_printk(KERN_ERR "can't register device seq\n"); 234 mutex_unlock(®ister_mutex); 235 return rc; 236 } 237 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, 238 NULL, 0, 239 &seq_oss_f_ops, NULL, 240 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 241 snd_printk(KERN_ERR "can't register device music\n"); 242 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0); 243 mutex_unlock(®ister_mutex); 244 return rc; 245 } 246 debug_printk(("device registered\n")); 247 mutex_unlock(®ister_mutex); 248 return 0; 249 } 250 251 static void 252 unregister_device(void) 253 { 254 mutex_lock(®ister_mutex); 255 debug_printk(("device unregistered\n")); 256 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 257 snd_printk(KERN_ERR "error unregister device music\n"); 258 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0) 259 snd_printk(KERN_ERR "error unregister device seq\n"); 260 mutex_unlock(®ister_mutex); 261 } 262 263 /* 264 * /proc interface 265 */ 266 267 #ifdef CONFIG_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 if (info_entry) 307 snd_info_unregister(info_entry); 308 info_entry = NULL; 309 } 310 #endif /* CONFIG_PROC_FS */ 311