sound/core/seq/oss/seq_oss.c

   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 <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  */
  35 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  36 MODULE_DESCRIPTION("OSS-compatible sequencer module");
  37 MODULE_LICENSE("GPL");
  38 /* Takashi says this is really only for sound-service-0-, but this is OK. */
  39 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
  40 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
  41
  42 #ifdef SNDRV_SEQ_OSS_DEBUG
  43 module_param(seq_oss_debug, int, 0644);
  44 MODULE_PARM_DESC(seq_oss_debug, "debug option");
  45 int seq_oss_debug = 0;
  46 #endif
  47
  48
  49 /*
  50  * prototypes
  51  */
  52 static int register_device(void);
  53 static void unregister_device(void);
  54 #ifdef CONFIG_PROC_FS
  55 static int register_proc(void);
  56 static void unregister_proc(void);
  57 #else
  58 static inline int register_proc(void) { return 0; }
  59 static inline void unregister_proc(void) {}
  60 #endif
  61
  62 static int odev_open(struct inode *inode, struct file *file);
  63 static int odev_release(struct inode *inode, struct file *file);
  64 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  65 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  66 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  67 static unsigned int odev_poll(struct file *file, poll_table * wait);
  68
  69
  70 /*
  71  * module interface
  72  */
  73
  74 static 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
 111 static 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
 119 module_init(alsa_seq_oss_init)
 120 module_exit(alsa_seq_oss_exit)
 121
 122 /*
 123  * ALSA minor device interface
 124  */
 125
 126 static DEFINE_MUTEX(register_mutex);
 127
 128 static int
 129 odev_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(&register_mutex);
 139         rc = snd_seq_oss_open(file, level);
 140         mutex_unlock(&register_mutex);
 141
 142         return rc;
 143 }
 144
 145 static int
 146 odev_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(&register_mutex);
 156         snd_seq_oss_release(dp);
 157         mutex_unlock(&register_mutex);
 158
 159         return 0;
 160 }
 161
 162 static ssize_t
 163 odev_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
 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         if (snd_BUG_ON(!dp))
 179                 return -ENXIO;
 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         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
 199 static unsigned int
 200 odev_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
 213 static 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         .llseek =       noop_llseek,
 224 };
 225
 226 static int __init
 227 register_device(void)
 228 {
 229         int rc;
 230
 231         mutex_lock(&register_mutex);
 232         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 233                                           NULL, 0,
 234                                           &seq_oss_f_ops, NULL,
 235                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 236                 snd_printk(KERN_ERR "can't register device seq\n");
 237                 mutex_unlock(&register_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,
 243                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 244                 snd_printk(KERN_ERR "can't register device music\n");
 245                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 246                 mutex_unlock(&register_mutex);
 247                 return rc;
 248         }
 249         debug_printk(("device registered\n"));
 250         mutex_unlock(&register_mutex);
 251         return 0;
 252 }
 253
 254 static void
 255 unregister_device(void)
 256 {
 257         mutex_lock(&register_mutex);
 258         debug_printk(("device unregistered\n"));
 259         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 260                 snd_printk(KERN_ERR "error unregister device music\n");
 261         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 262                 snd_printk(KERN_ERR "error unregister device seq\n");
 263         mutex_unlock(&register_mutex);
 264 }
 265
 266 /*
 267  * /proc interface
 268  */
 269
 270 #ifdef CONFIG_PROC_FS
 271
 272 static struct snd_info_entry *info_entry;
 273
 274 static void
 275 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
 276 {
 277         mutex_lock(&register_mutex);
 278         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
 279         snd_seq_oss_system_info_read(buf);
 280         snd_seq_oss_synth_info_read(buf);
 281         snd_seq_oss_midi_info_read(buf);
 282         mutex_unlock(&register_mutex);
 283 }
 284
 285
 286 static int __init
 287 register_proc(void)
 288 {
 289         struct snd_info_entry *entry;
 290
 291         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
 292         if (entry == NULL)
 293                 return -ENOMEM;
 294
 295         entry->content = SNDRV_INFO_CONTENT_TEXT;
 296         entry->private_data = NULL;
 297         entry->c.text.read = info_read;
 298         if (snd_info_register(entry) < 0) {
 299                 snd_info_free_entry(entry);
 300                 return -ENOMEM;
 301         }
 302         info_entry = entry;
 303         return 0;
 304 }
 305
 306 static void
 307 unregister_proc(void)
 308 {
 309         snd_info_free_entry(info_entry);
 310         info_entry = NULL;
 311 }
 312 #endif /* CONFIG_PROC_FS */