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 <sound/driver.h>
  24 #include <linux/init.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/mutex.h>
  28 #include <sound/core.h>
  29 #include <sound/minors.h>
  30 #include <sound/initval.h>
  31 #include "seq_oss_device.h"
  32 #include "seq_oss_synth.h"
  33
  34 /*
  35  * module option
  36  */
  37 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  38 MODULE_DESCRIPTION("OSS-compatible sequencer module");
  39 MODULE_LICENSE("GPL");
  40 /* Takashi says this is really only for sound-service-0-, but this is OK. */
  41 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
  42 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
  43
  44 #ifdef SNDRV_SEQ_OSS_DEBUG
  45 module_param(seq_oss_debug, int, 0644);
  46 MODULE_PARM_DESC(seq_oss_debug, "debug option");
  47 int seq_oss_debug = 0;
  48 #endif
  49
  50
  51 /*
  52  * prototypes
  53  */
  54 static int register_device(void);
  55 static void unregister_device(void);
  56 #ifdef CONFIG_PROC_FS
  57 static int register_proc(void);
  58 static void unregister_proc(void);
  59 #else
  60 static inline int register_proc(void) { return 0; }
  61 static inline void unregister_proc(void) {}
  62 #endif
  63
  64 static int odev_open(struct inode *inode, struct file *file);
  65 static int odev_release(struct inode *inode, struct file *file);
  66 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  67 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  68 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  69 static unsigned int odev_poll(struct file *file, poll_table * wait);
  70
  71
  72 /*
  73  * module interface
  74  */
  75
  76 static int __init alsa_seq_oss_init(void)
  77 {
  78         int rc;
  79         static struct snd_seq_dev_ops ops = {
  80                 snd_seq_oss_synth_register,
  81                 snd_seq_oss_synth_unregister,
  82         };
  83
  84         snd_seq_autoload_lock();
  85         if ((rc = register_device()) < 0)
  86                 goto error;
  87         if ((rc = register_proc()) < 0) {
  88                 unregister_device();
  89                 goto error;
  90         }
  91         if ((rc = snd_seq_oss_create_client()) < 0) {
  92                 unregister_proc();
  93                 unregister_device();
  94                 goto error;
  95         }
  96
  97         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
  98                                                  sizeof(struct snd_seq_oss_reg))) < 0) {
  99                 snd_seq_oss_delete_client();
 100                 unregister_proc();
 101                 unregister_device();
 102                 goto error;
 103         }
 104
 105         /* success */
 106         snd_seq_oss_synth_init();
 107
 108  error:
 109         snd_seq_autoload_unlock();
 110         return rc;
 111 }
 112
 113 static void __exit alsa_seq_oss_exit(void)
 114 {
 115         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
 116         snd_seq_oss_delete_client();
 117         unregister_proc();
 118         unregister_device();
 119 }
 120
 121 module_init(alsa_seq_oss_init)
 122 module_exit(alsa_seq_oss_exit)
 123
 124 /*
 125  * ALSA minor device interface
 126  */
 127
 128 static DEFINE_MUTEX(register_mutex);
 129
 130 static int
 131 odev_open(struct inode *inode, struct file *file)
 132 {
 133         int level, rc;
 134
 135         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 136                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 137         else
 138                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 139
 140         mutex_lock(&register_mutex);
 141         rc = snd_seq_oss_open(file, level);
 142         mutex_unlock(&register_mutex);
 143
 144         return rc;
 145 }
 146
 147 static int
 148 odev_release(struct inode *inode, struct file *file)
 149 {
 150         struct seq_oss_devinfo *dp;
 151
 152         if ((dp = file->private_data) == NULL)
 153                 return 0;
 154
 155         snd_seq_oss_drain_write(dp);
 156
 157         mutex_lock(&register_mutex);
 158         snd_seq_oss_release(dp);
 159         mutex_unlock(&register_mutex);
 160
 161         return 0;
 162 }
 163
 164 static ssize_t
 165 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 166 {
 167         struct seq_oss_devinfo *dp;
 168         dp = file->private_data;
 169         snd_assert(dp != NULL, return -EIO);
 170         return snd_seq_oss_read(dp, buf, count);
 171 }
 172
 173
 174 static ssize_t
 175 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 176 {
 177         struct seq_oss_devinfo *dp;
 178         dp = file->private_data;
 179         snd_assert(dp != NULL, return -EIO);
 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         snd_assert(dp != NULL, return -EIO);
 189         return snd_seq_oss_ioctl(dp, cmd, arg);
 190 }
 191
 192 #ifdef CONFIG_COMPAT
 193 #define odev_ioctl_compat       odev_ioctl
 194 #else
 195 #define odev_ioctl_compat       NULL
 196 #endif
 197
 198 static unsigned int
 199 odev_poll(struct file *file, poll_table * wait)
 200 {
 201         struct seq_oss_devinfo *dp;
 202         dp = file->private_data;
 203         snd_assert(dp != NULL, return 0);
 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 };
 222
 223 static int __init
 224 register_device(void)
 225 {
 226         int rc;
 227
 228         mutex_lock(&register_mutex);
 229         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 230                                           NULL, 0,
 231                                           &seq_oss_f_ops, NULL,
 232                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 233                 snd_printk(KERN_ERR "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,
 240                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 241                 snd_printk(KERN_ERR "can't register device music\n");
 242                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 243                 mutex_unlock(&register_mutex);
 244                 return rc;
 245         }
 246         debug_printk(("device registered\n"));
 247         mutex_unlock(&register_mutex);
 248         return 0;
 249 }
 250
 251 static void
 252 unregister_device(void)
 253 {
 254         mutex_lock(&register_mutex);
 255         debug_printk(("device unregistered\n"));
 256         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 257                 snd_printk(KERN_ERR "error unregister device music\n");
 258         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 259                 snd_printk(KERN_ERR "error unregister device seq\n");
 260         mutex_unlock(&register_mutex);
 261 }
 262
 263 /*
 264  * /proc interface
 265  */
 266
 267 #ifdef CONFIG_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_PROC_FS */