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/moduleparam.h> 25#include <linux/mutex.h> 26#include <sound/core.h> 27#include <sound/minors.h> 28#include <sound/initval.h> 29#include "seq_oss_device.h" 30#include "seq_oss_synth.h" 31 32/* 33 * module option 34 */ 35MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 36MODULE_DESCRIPTION("OSS-compatible sequencer module"); 37MODULE_LICENSE("GPL"); 38/* Takashi says this is really only for sound-service-0-, but this is OK. */ 39MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER); 40MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC); 41 42#ifdef SNDRV_SEQ_OSS_DEBUG 43module_param(seq_oss_debug, int, 0644); 44MODULE_PARM_DESC(seq_oss_debug, "debug option"); 45int seq_oss_debug = 0; 46#endif 47 48 49/* 50 * prototypes 51 */ 52static int register_device(void); 53static void unregister_device(void); 54#ifdef CONFIG_PROC_FS 55static int register_proc(void); 56static void unregister_proc(void); 57#else 58static inline int register_proc(void) { return 0; } 59static inline void unregister_proc(void) {} 60#endif 61 62static int odev_open(struct inode *inode, struct file *file); 63static int odev_release(struct inode *inode, struct file *file); 64static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset); 65static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset); 66static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 67static unsigned int odev_poll(struct file *file, poll_table * wait); 68 69 70/* 71 * module interface 72 */ 73 74static int __init alsa_seq_oss_init(void) 75{ 76 int rc; 77 static struct snd_seq_dev_ops ops = { 78 snd_seq_oss_synth_register, 79 snd_seq_oss_synth_unregister, 80 }; 81 82 snd_seq_autoload_lock(); 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 if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops, 96 sizeof(struct snd_seq_oss_reg))) < 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 snd_seq_autoload_unlock(); 108 return rc; 109} 110 111static void __exit alsa_seq_oss_exit(void) 112{ 113 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS); 114 snd_seq_oss_delete_client(); 115 unregister_proc(); 116 unregister_device(); 117} 118 119module_init(alsa_seq_oss_init) 120module_exit(alsa_seq_oss_exit) 121 122/* 123 * ALSA minor device interface 124 */ 125 126static DEFINE_MUTEX(register_mutex); 127 128static int 129odev_open(struct inode *inode, struct file *file) 130{ 131 int level, rc; 132 133 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC) 134 level = SNDRV_SEQ_OSS_MODE_MUSIC; 135 else 136 level = SNDRV_SEQ_OSS_MODE_SYNTH; 137 138 mutex_lock(®ister_mutex); 139 rc = snd_seq_oss_open(file, level); 140 mutex_unlock(®ister_mutex); 141 142 return rc; 143} 144 145static int 146odev_release(struct inode *inode, struct file *file) 147{ 148 struct seq_oss_devinfo *dp; 149 150 if ((dp = file->private_data) == NULL) 151 return 0; 152 153 snd_seq_oss_drain_write(dp); 154 155 mutex_lock(®ister_mutex); 156 snd_seq_oss_release(dp); 157 mutex_unlock(®ister_mutex); 158 159 return 0; 160} 161 162static ssize_t 163odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 164{ 165 struct seq_oss_devinfo *dp; 166 dp = file->private_data; 167 if (snd_BUG_ON(!dp)) 168 return -ENXIO; 169 return snd_seq_oss_read(dp, buf, count); 170} 171 172 173static ssize_t 174odev_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 if (snd_BUG_ON(!dp)) 179 return -ENXIO; 180 return snd_seq_oss_write(dp, buf, count, file); 181} 182 183static long 184odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 185{ 186 struct seq_oss_devinfo *dp; 187 dp = file->private_data; 188 if (snd_BUG_ON(!dp)) 189 return -ENXIO; 190 return snd_seq_oss_ioctl(dp, cmd, arg); 191} 192 193#ifdef CONFIG_COMPAT 194#define odev_ioctl_compat odev_ioctl 195#else 196#define odev_ioctl_compat NULL 197#endif 198 199static unsigned int 200odev_poll(struct file *file, poll_table * wait) 201{ 202 struct seq_oss_devinfo *dp; 203 dp = file->private_data; 204 if (snd_BUG_ON(!dp)) 205 return -ENXIO; 206 return snd_seq_oss_poll(dp, file, wait); 207} 208 209/* 210 * registration of sequencer minor device 211 */ 212 213static const struct file_operations seq_oss_f_ops = 214{ 215 .owner = THIS_MODULE, 216 .read = odev_read, 217 .write = odev_write, 218 .open = odev_open, 219 .release = odev_release, 220 .poll = odev_poll, 221 .unlocked_ioctl = odev_ioctl, 222 .compat_ioctl = odev_ioctl_compat, 223}; 224 225static int __init 226register_device(void) 227{ 228 int rc; 229 230 mutex_lock(®ister_mutex); 231 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, 232 NULL, 0, 233 &seq_oss_f_ops, NULL, 234 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 235 snd_printk(KERN_ERR "can't register device seq\n"); 236 mutex_unlock(®ister_mutex); 237 return rc; 238 } 239 if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, 240 NULL, 0, 241 &seq_oss_f_ops, NULL, 242 SNDRV_SEQ_OSS_DEVNAME)) < 0) { 243 snd_printk(KERN_ERR "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 debug_printk(("device registered\n")); 249 mutex_unlock(®ister_mutex); 250 return 0; 251} 252 253static void 254unregister_device(void) 255{ 256 mutex_lock(®ister_mutex); 257 debug_printk(("device unregistered\n")); 258 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 259 snd_printk(KERN_ERR "error unregister device music\n"); 260 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0) 261 snd_printk(KERN_ERR "error unregister device seq\n"); 262 mutex_unlock(®ister_mutex); 263} 264 265/* 266 * /proc interface 267 */ 268 269#ifdef CONFIG_PROC_FS 270 271static struct snd_info_entry *info_entry; 272 273static void 274info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf) 275{ 276 mutex_lock(®ister_mutex); 277 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR); 278 snd_seq_oss_system_info_read(buf); 279 snd_seq_oss_synth_info_read(buf); 280 snd_seq_oss_midi_info_read(buf); 281 mutex_unlock(®ister_mutex); 282} 283 284 285static int __init 286register_proc(void) 287{ 288 struct snd_info_entry *entry; 289 290 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root); 291 if (entry == NULL) 292 return -ENOMEM; 293 294 entry->content = SNDRV_INFO_CONTENT_TEXT; 295 entry->private_data = NULL; 296 entry->c.text.read = info_read; 297 if (snd_info_register(entry) < 0) { 298 snd_info_free_entry(entry); 299 return -ENOMEM; 300 } 301 info_entry = entry; 302 return 0; 303} 304 305static void 306unregister_proc(void) 307{ 308 snd_info_free_entry(info_entry); 309 info_entry = NULL; 310} 311#endif /* CONFIG_PROC_FS */ 312