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 <linux/compat.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
  44 /*
  45  * prototypes
  46  */
  47 static int register_device(void);
  48 static void unregister_device(void);
  49 #ifdef CONFIG_SND_PROC_FS
  50 static int register_proc(void);
  51 static void unregister_proc(void);
  52 #else
  53 static inline int register_proc(void) { return 0; }
  54 static inline void unregister_proc(void) {}
  55 #endif
  56
  57 static int odev_open(struct inode *inode, struct file *file);
  58 static int odev_release(struct inode *inode, struct file *file);
  59 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  60 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  61 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  62 static unsigned int odev_poll(struct file *file, poll_table * wait);
  63
  64
  65 /*
  66  * module interface
  67  */
  68
  69 static struct snd_seq_driver seq_oss_synth_driver = {
  70         .driver = {
  71                 .name = KBUILD_MODNAME,
  72                 .probe = snd_seq_oss_synth_probe,
  73                 .remove = snd_seq_oss_synth_remove,
  74         },
  75         .id = SNDRV_SEQ_DEV_ID_OSS,
  76         .argsize = sizeof(struct snd_seq_oss_reg),
  77 };
  78
  79 static int __init alsa_seq_oss_init(void)
  80 {
  81         int rc;
  82
  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         rc = snd_seq_driver_register(&seq_oss_synth_driver);
  96         if (rc < 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         return rc;
 108 }
 109
 110 static void __exit alsa_seq_oss_exit(void)
 111 {
 112         snd_seq_driver_unregister(&seq_oss_synth_driver);
 113         snd_seq_oss_delete_client();
 114         unregister_proc();
 115         unregister_device();
 116 }
 117
 118 module_init(alsa_seq_oss_init)
 119 module_exit(alsa_seq_oss_exit)
 120
 121 /*
 122  * ALSA minor device interface
 123  */
 124
 125 static DEFINE_MUTEX(register_mutex);
 126
 127 static int
 128 odev_open(struct inode *inode, struct file *file)
 129 {
 130         int level, rc;
 131
 132         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 133                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 134         else
 135                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 136
 137         mutex_lock(&register_mutex);
 138         rc = snd_seq_oss_open(file, level);
 139         mutex_unlock(&register_mutex);
 140
 141         return rc;
 142 }
 143
 144 static int
 145 odev_release(struct inode *inode, struct file *file)
 146 {
 147         struct seq_oss_devinfo *dp;
 148
 149         if ((dp = file->private_data) == NULL)
 150                 return 0;
 151
 152         mutex_lock(&register_mutex);
 153         snd_seq_oss_release(dp);
 154         mutex_unlock(&register_mutex);
 155
 156         return 0;
 157 }
 158
 159 static ssize_t
 160 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 161 {
 162         struct seq_oss_devinfo *dp;
 163         dp = file->private_data;
 164         if (snd_BUG_ON(!dp))
 165                 return -ENXIO;
 166         return snd_seq_oss_read(dp, buf, count);
 167 }
 168
 169
 170 static ssize_t
 171 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 172 {
 173         struct seq_oss_devinfo *dp;
 174         dp = file->private_data;
 175         if (snd_BUG_ON(!dp))
 176                 return -ENXIO;
 177         return snd_seq_oss_write(dp, buf, count, file);
 178 }
 179
 180 static long
 181 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 182 {
 183         struct seq_oss_devinfo *dp;
 184         dp = file->private_data;
 185         if (snd_BUG_ON(!dp))
 186                 return -ENXIO;
 187         return snd_seq_oss_ioctl(dp, cmd, arg);
 188 }
 189
 190 #ifdef CONFIG_COMPAT
 191 static long odev_ioctl_compat(struct file *file, unsigned int cmd,
 192                               unsigned long arg)
 193 {
 194         return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 195 }
 196 #else
 197 #define odev_ioctl_compat       NULL
 198 #endif
 199
 200 static unsigned int
 201 odev_poll(struct file *file, poll_table * wait)
 202 {
 203         struct seq_oss_devinfo *dp;
 204         dp = file->private_data;
 205         if (snd_BUG_ON(!dp))
 206                 return -ENXIO;
 207         return snd_seq_oss_poll(dp, file, wait);
 208 }
 209
 210 /*
 211  * registration of sequencer minor device
 212  */
 213
 214 static const struct file_operations seq_oss_f_ops =
 215 {
 216         .owner =        THIS_MODULE,
 217         .read =         odev_read,
 218         .write =        odev_write,
 219         .open =         odev_open,
 220         .release =      odev_release,
 221         .poll =         odev_poll,
 222         .unlocked_ioctl =       odev_ioctl,
 223         .compat_ioctl = odev_ioctl_compat,
 224         .llseek =       noop_llseek,
 225 };
 226
 227 static int __init
 228 register_device(void)
 229 {
 230         int rc;
 231
 232         mutex_lock(&register_mutex);
 233         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 234                                           NULL, 0,
 235                                           &seq_oss_f_ops, NULL)) < 0) {
 236                 pr_err("ALSA: seq_oss: 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)) < 0) {
 243                 pr_err("ALSA: seq_oss: can't register device music\n");
 244                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 245                 mutex_unlock(&register_mutex);
 246                 return rc;
 247         }
 248         mutex_unlock(&register_mutex);
 249         return 0;
 250 }
 251
 252 static void
 253 unregister_device(void)
 254 {
 255         mutex_lock(&register_mutex);
 256         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 257                 pr_err("ALSA: seq_oss: error unregister device music\n");
 258         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 259                 pr_err("ALSA: seq_oss: error unregister device seq\n");
 260         mutex_unlock(&register_mutex);
 261 }
 262
 263 /*
 264  * /proc interface
 265  */
 266
 267 #ifdef CONFIG_SND_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(&register_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(&register_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         snd_info_free_entry(info_entry);
 307         info_entry = NULL;
 308 }
 309 #endif /* CONFIG_SND_PROC_FS */