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         snd_seq_oss_drain_write(dp);
 153
 154         mutex_lock(&register_mutex);
 155         snd_seq_oss_release(dp);
 156         mutex_unlock(&register_mutex);
 157
 158         return 0;
 159 }
 160
 161 static ssize_t
 162 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 163 {
 164         struct seq_oss_devinfo *dp;
 165         dp = file->private_data;
 166         if (snd_BUG_ON(!dp))
 167                 return -ENXIO;
 168         return snd_seq_oss_read(dp, buf, count);
 169 }
 170
 171
 172 static ssize_t
 173 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 174 {
 175         struct seq_oss_devinfo *dp;
 176         dp = file->private_data;
 177         if (snd_BUG_ON(!dp))
 178                 return -ENXIO;
 179         return snd_seq_oss_write(dp, buf, count, file);
 180 }
 181
 182 static long
 183 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 184 {
 185         struct seq_oss_devinfo *dp;
 186         dp = file->private_data;
 187         if (snd_BUG_ON(!dp))
 188                 return -ENXIO;
 189         return snd_seq_oss_ioctl(dp, cmd, arg);
 190 }
 191
 192 #ifdef CONFIG_COMPAT
 193 static long odev_ioctl_compat(struct file *file, unsigned int cmd,
 194                               unsigned long arg)
 195 {
 196         return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 197 }
 198 #else
 199 #define odev_ioctl_compat       NULL
 200 #endif
 201
 202 static unsigned int
 203 odev_poll(struct file *file, poll_table * wait)
 204 {
 205         struct seq_oss_devinfo *dp;
 206         dp = file->private_data;
 207         if (snd_BUG_ON(!dp))
 208                 return -ENXIO;
 209         return snd_seq_oss_poll(dp, file, wait);
 210 }
 211
 212 /*
 213  * registration of sequencer minor device
 214  */
 215
 216 static const struct file_operations seq_oss_f_ops =
 217 {
 218         .owner =        THIS_MODULE,
 219         .read =         odev_read,
 220         .write =        odev_write,
 221         .open =         odev_open,
 222         .release =      odev_release,
 223         .poll =         odev_poll,
 224         .unlocked_ioctl =       odev_ioctl,
 225         .compat_ioctl = odev_ioctl_compat,
 226         .llseek =       noop_llseek,
 227 };
 228
 229 static int __init
 230 register_device(void)
 231 {
 232         int rc;
 233
 234         mutex_lock(&register_mutex);
 235         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 236                                           NULL, 0,
 237                                           &seq_oss_f_ops, NULL)) < 0) {
 238                 pr_err("ALSA: seq_oss: can't register device seq\n");
 239                 mutex_unlock(&register_mutex);
 240                 return rc;
 241         }
 242         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 243                                           NULL, 0,
 244                                           &seq_oss_f_ops, NULL)) < 0) {
 245                 pr_err("ALSA: seq_oss: can't register device music\n");
 246                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 247                 mutex_unlock(&register_mutex);
 248                 return rc;
 249         }
 250         mutex_unlock(&register_mutex);
 251         return 0;
 252 }
 253
 254 static void
 255 unregister_device(void)
 256 {
 257         mutex_lock(&register_mutex);
 258         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 259                 pr_err("ALSA: seq_oss: error unregister device music\n");
 260         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 261                 pr_err("ALSA: seq_oss: error unregister device seq\n");
 262         mutex_unlock(&register_mutex);
 263 }
 264
 265 /*
 266  * /proc interface
 267  */
 268
 269 #ifdef CONFIG_SND_PROC_FS
 270
 271 static struct snd_info_entry *info_entry;
 272
 273 static void
 274 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
 275 {
 276         mutex_lock(&register_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(&register_mutex);
 282 }
 283
 284
 285 static int __init
 286 register_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
 305 static void
 306 unregister_proc(void)
 307 {
 308         snd_info_free_entry(info_entry);
 309         info_entry = NULL;
 310 }
 311 #endif /* CONFIG_SND_PROC_FS */