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_SND_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 struct snd_seq_driver seq_oss_synth_driver = {
  69         .driver = {
  70                 .name = KBUILD_MODNAME,
  71                 .probe = snd_seq_oss_synth_probe,
  72                 .remove = snd_seq_oss_synth_remove,
  73         },
  74         .id = SNDRV_SEQ_DEV_ID_OSS,
  75         .argsize = sizeof(struct snd_seq_oss_reg),
  76 };
  77
  78 static int __init alsa_seq_oss_init(void)
  79 {
  80         int rc;
  81
  82         if ((rc = register_device()) < 0)
  83                 goto error;
  84         if ((rc = register_proc()) < 0) {
  85                 unregister_device();
  86                 goto error;
  87         }
  88         if ((rc = snd_seq_oss_create_client()) < 0) {
  89                 unregister_proc();
  90                 unregister_device();
  91                 goto error;
  92         }
  93
  94         rc = snd_seq_driver_register(&seq_oss_synth_driver);
  95         if (rc < 0) {
  96                 snd_seq_oss_delete_client();
  97                 unregister_proc();
  98                 unregister_device();
  99                 goto error;
 100         }
 101
 102         /* success */
 103         snd_seq_oss_synth_init();
 104
 105  error:
 106         return rc;
 107 }
 108
 109 static void __exit alsa_seq_oss_exit(void)
 110 {
 111         snd_seq_driver_unregister(&seq_oss_synth_driver);
 112         snd_seq_oss_delete_client();
 113         unregister_proc();
 114         unregister_device();
 115 }
 116
 117 module_init(alsa_seq_oss_init)
 118 module_exit(alsa_seq_oss_exit)
 119
 120 /*
 121  * ALSA minor device interface
 122  */
 123
 124 static DEFINE_MUTEX(register_mutex);
 125
 126 static int
 127 odev_open(struct inode *inode, struct file *file)
 128 {
 129         int level, rc;
 130
 131         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 132                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 133         else
 134                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 135
 136         mutex_lock(&register_mutex);
 137         rc = snd_seq_oss_open(file, level);
 138         mutex_unlock(&register_mutex);
 139
 140         return rc;
 141 }
 142
 143 static int
 144 odev_release(struct inode *inode, struct file *file)
 145 {
 146         struct seq_oss_devinfo *dp;
 147
 148         if ((dp = file->private_data) == NULL)
 149                 return 0;
 150
 151         snd_seq_oss_drain_write(dp);
 152
 153         mutex_lock(&register_mutex);
 154         snd_seq_oss_release(dp);
 155         mutex_unlock(&register_mutex);
 156
 157         return 0;
 158 }
 159
 160 static ssize_t
 161 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 162 {
 163         struct seq_oss_devinfo *dp;
 164         dp = file->private_data;
 165         if (snd_BUG_ON(!dp))
 166                 return -ENXIO;
 167         return snd_seq_oss_read(dp, buf, count);
 168 }
 169
 170
 171 static ssize_t
 172 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 173 {
 174         struct seq_oss_devinfo *dp;
 175         dp = file->private_data;
 176         if (snd_BUG_ON(!dp))
 177                 return -ENXIO;
 178         return snd_seq_oss_write(dp, buf, count, file);
 179 }
 180
 181 static long
 182 odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 183 {
 184         struct seq_oss_devinfo *dp;
 185         dp = file->private_data;
 186         if (snd_BUG_ON(!dp))
 187                 return -ENXIO;
 188         return snd_seq_oss_ioctl(dp, cmd, arg);
 189 }
 190
 191 #ifdef CONFIG_COMPAT
 192 #define odev_ioctl_compat       odev_ioctl
 193 #else
 194 #define odev_ioctl_compat       NULL
 195 #endif
 196
 197 static unsigned int
 198 odev_poll(struct file *file, poll_table * wait)
 199 {
 200         struct seq_oss_devinfo *dp;
 201         dp = file->private_data;
 202         if (snd_BUG_ON(!dp))
 203                 return -ENXIO;
 204         return snd_seq_oss_poll(dp, file, wait);
 205 }
 206
 207 /*
 208  * registration of sequencer minor device
 209  */
 210
 211 static const struct file_operations seq_oss_f_ops =
 212 {
 213         .owner =        THIS_MODULE,
 214         .read =         odev_read,
 215         .write =        odev_write,
 216         .open =         odev_open,
 217         .release =      odev_release,
 218         .poll =         odev_poll,
 219         .unlocked_ioctl =       odev_ioctl,
 220         .compat_ioctl = odev_ioctl_compat,
 221         .llseek =       noop_llseek,
 222 };
 223
 224 static int __init
 225 register_device(void)
 226 {
 227         int rc;
 228
 229         mutex_lock(&register_mutex);
 230         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 231                                           NULL, 0,
 232                                           &seq_oss_f_ops, NULL)) < 0) {
 233                 pr_err("ALSA: seq_oss: can't register device seq\n");
 234                 mutex_unlock(&register_mutex);
 235                 return rc;
 236         }
 237         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 238                                           NULL, 0,
 239                                           &seq_oss_f_ops, NULL)) < 0) {
 240                 pr_err("ALSA: seq_oss: can't register device music\n");
 241                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 242                 mutex_unlock(&register_mutex);
 243                 return rc;
 244         }
 245         mutex_unlock(&register_mutex);
 246         return 0;
 247 }
 248
 249 static void
 250 unregister_device(void)
 251 {
 252         mutex_lock(&register_mutex);
 253         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 254                 pr_err("ALSA: seq_oss: error unregister device music\n");
 255         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 256                 pr_err("ALSA: seq_oss: error unregister device seq\n");
 257         mutex_unlock(&register_mutex);
 258 }
 259
 260 /*
 261  * /proc interface
 262  */
 263
 264 #ifdef CONFIG_SND_PROC_FS
 265
 266 static struct snd_info_entry *info_entry;
 267
 268 static void
 269 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
 270 {
 271         mutex_lock(&register_mutex);
 272         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
 273         snd_seq_oss_system_info_read(buf);
 274         snd_seq_oss_synth_info_read(buf);
 275         snd_seq_oss_midi_info_read(buf);
 276         mutex_unlock(&register_mutex);
 277 }
 278
 279
 280 static int __init
 281 register_proc(void)
 282 {
 283         struct snd_info_entry *entry;
 284
 285         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
 286         if (entry == NULL)
 287                 return -ENOMEM;
 288
 289         entry->content = SNDRV_INFO_CONTENT_TEXT;
 290         entry->private_data = NULL;
 291         entry->c.text.read = info_read;
 292         if (snd_info_register(entry) < 0) {
 293                 snd_info_free_entry(entry);
 294                 return -ENOMEM;
 295         }
 296         info_entry = entry;
 297         return 0;
 298 }
 299
 300 static void
 301 unregister_proc(void)
 302 {
 303         snd_info_free_entry(info_entry);
 304         info_entry = NULL;
 305 }
 306 #endif /* CONFIG_SND_PROC_FS */