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
  43 /*
  44  * prototypes
  45  */
  46 static int register_device(void);
  47 static void unregister_device(void);
  48 #ifdef CONFIG_PROC_FS
  49 static int register_proc(void);
  50 static void unregister_proc(void);
  51 #else
  52 static inline int register_proc(void) { return 0; }
  53 static inline void unregister_proc(void) {}
  54 #endif
  55
  56 static int odev_open(struct inode *inode, struct file *file);
  57 static int odev_release(struct inode *inode, struct file *file);
  58 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  59 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  60 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  61 static unsigned int odev_poll(struct file *file, poll_table * wait);
  62
  63
  64 /*
  65  * module interface
  66  */
  67
  68 static int __init alsa_seq_oss_init(void)
  69 {
  70         int rc;
  71         static struct snd_seq_dev_ops ops = {
  72                 snd_seq_oss_synth_register,
  73                 snd_seq_oss_synth_unregister,
  74         };
  75
  76         snd_seq_autoload_lock();
  77         if ((rc = register_device()) < 0)
  78                 goto error;
  79         if ((rc = register_proc()) < 0) {
  80                 unregister_device();
  81                 goto error;
  82         }
  83         if ((rc = snd_seq_oss_create_client()) < 0) {
  84                 unregister_proc();
  85                 unregister_device();
  86                 goto error;
  87         }
  88
  89         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
  90                                                  sizeof(struct snd_seq_oss_reg))) < 0) {
  91                 snd_seq_oss_delete_client();
  92                 unregister_proc();
  93                 unregister_device();
  94                 goto error;
  95         }
  96
  97         /* success */
  98         snd_seq_oss_synth_init();
  99
 100  error:
 101         snd_seq_autoload_unlock();
 102         return rc;
 103 }
 104
 105 static void __exit alsa_seq_oss_exit(void)
 106 {
 107         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
 108         snd_seq_oss_delete_client();
 109         unregister_proc();
 110         unregister_device();
 111 }
 112
 113 module_init(alsa_seq_oss_init)
 114 module_exit(alsa_seq_oss_exit)
 115
 116 /*
 117  * ALSA minor device interface
 118  */
 119
 120 static DEFINE_MUTEX(register_mutex);
 121
 122 static int
 123 odev_open(struct inode *inode, struct file *file)
 124 {
 125         int level, rc;
 126
 127         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 128                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 129         else
 130                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 131
 132         mutex_lock(&register_mutex);
 133         rc = snd_seq_oss_open(file, level);
 134         mutex_unlock(&register_mutex);
 135
 136         return rc;
 137 }
 138
 139 static int
 140 odev_release(struct inode *inode, struct file *file)
 141 {
 142         struct seq_oss_devinfo *dp;
 143
 144         if ((dp = file->private_data) == NULL)
 145                 return 0;
 146
 147         mutex_lock(&register_mutex);
 148         snd_seq_oss_release(dp);
 149         mutex_unlock(&register_mutex);
 150
 151         return 0;
 152 }
 153
 154 static ssize_t
 155 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 156 {
 157         struct seq_oss_devinfo *dp;
 158         dp = file->private_data;
 159         if (snd_BUG_ON(!dp))
 160                 return -ENXIO;
 161         return snd_seq_oss_read(dp, buf, count);
 162 }
 163
 164
 165 static ssize_t
 166 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 167 {
 168         struct seq_oss_devinfo *dp;
 169         dp = file->private_data;
 170         if (snd_BUG_ON(!dp))
 171                 return -ENXIO;
 172         return snd_seq_oss_write(dp, buf, count, file);
 173 }
 174
 175 static long
 176 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 177 {
 178         struct seq_oss_devinfo *dp;
 179         dp = file->private_data;
 180         if (snd_BUG_ON(!dp))
 181                 return -ENXIO;
 182         return snd_seq_oss_ioctl(dp, cmd, arg);
 183 }
 184
 185 #ifdef CONFIG_COMPAT
 186 #define odev_ioctl_compat       odev_ioctl
 187 #else
 188 #define odev_ioctl_compat       NULL
 189 #endif
 190
 191 static unsigned int
 192 odev_poll(struct file *file, poll_table * wait)
 193 {
 194         struct seq_oss_devinfo *dp;
 195         dp = file->private_data;
 196         if (snd_BUG_ON(!dp))
 197                 return -ENXIO;
 198         return snd_seq_oss_poll(dp, file, wait);
 199 }
 200
 201 /*
 202  * registration of sequencer minor device
 203  */
 204
 205 static const struct file_operations seq_oss_f_ops =
 206 {
 207         .owner =        THIS_MODULE,
 208         .read =         odev_read,
 209         .write =        odev_write,
 210         .open =         odev_open,
 211         .release =      odev_release,
 212         .poll =         odev_poll,
 213         .unlocked_ioctl =       odev_ioctl,
 214         .compat_ioctl = odev_ioctl_compat,
 215         .llseek =       noop_llseek,
 216 };
 217
 218 static int __init
 219 register_device(void)
 220 {
 221         int rc;
 222
 223         mutex_lock(&register_mutex);
 224         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 225                                           NULL, 0,
 226                                           &seq_oss_f_ops, NULL)) < 0) {
 227                 pr_err("ALSA: seq_oss: can't register device seq\n");
 228                 mutex_unlock(&register_mutex);
 229                 return rc;
 230         }
 231         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 232                                           NULL, 0,
 233                                           &seq_oss_f_ops, NULL)) < 0) {
 234                 pr_err("ALSA: seq_oss: can't register device music\n");
 235                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 236                 mutex_unlock(&register_mutex);
 237                 return rc;
 238         }
 239         mutex_unlock(&register_mutex);
 240         return 0;
 241 }
 242
 243 static void
 244 unregister_device(void)
 245 {
 246         mutex_lock(&register_mutex);
 247         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 248                 pr_err("ALSA: seq_oss: error unregister device music\n");
 249         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 250                 pr_err("ALSA: seq_oss: error unregister device seq\n");
 251         mutex_unlock(&register_mutex);
 252 }
 253
 254 /*
 255  * /proc interface
 256  */
 257
 258 #ifdef CONFIG_PROC_FS
 259
 260 static struct snd_info_entry *info_entry;
 261
 262 static void
 263 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
 264 {
 265         mutex_lock(&register_mutex);
 266         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
 267         snd_seq_oss_system_info_read(buf);
 268         snd_seq_oss_synth_info_read(buf);
 269         snd_seq_oss_midi_info_read(buf);
 270         mutex_unlock(&register_mutex);
 271 }
 272
 273
 274 static int __init
 275 register_proc(void)
 276 {
 277         struct snd_info_entry *entry;
 278
 279         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
 280         if (entry == NULL)
 281                 return -ENOMEM;
 282
 283         entry->content = SNDRV_INFO_CONTENT_TEXT;
 284         entry->private_data = NULL;
 285         entry->c.text.read = info_read;
 286         if (snd_info_register(entry) < 0) {
 287                 snd_info_free_entry(entry);
 288                 return -ENOMEM;
 289         }
 290         info_entry = entry;
 291         return 0;
 292 }
 293
 294 static void
 295 unregister_proc(void)
 296 {
 297         snd_info_free_entry(info_entry);
 298         info_entry = NULL;
 299 }
 300 #endif /* CONFIG_PROC_FS */