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/moduleparam.h>
  26 #include <linux/mutex.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 #ifdef SNDRV_SEQ_OSS_DEBUG
  44 module_param(seq_oss_debug, int, 0644);
  45 MODULE_PARM_DESC(seq_oss_debug, "debug option");
  46 int seq_oss_debug = 0;
  47 #endif
  48
  49
  50 /*
  51  * prototypes
  52  */
  53 static int register_device(void);
  54 static void unregister_device(void);
  55 #ifdef CONFIG_PROC_FS
  56 static int register_proc(void);
  57 static void unregister_proc(void);
  58 #else
  59 static inline int register_proc(void) { return 0; }
  60 static inline void unregister_proc(void) {}
  61 #endif
  62
  63 static int odev_open(struct inode *inode, struct file *file);
  64 static int odev_release(struct inode *inode, struct file *file);
  65 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  66 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  67 static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  68 static unsigned int odev_poll(struct file *file, poll_table * wait);
  69
  70
  71 /*
  72  * module interface
  73  */
  74
  75 static int __init alsa_seq_oss_init(void)
  76 {
  77         int rc;
  78         static struct snd_seq_dev_ops ops = {
  79                 snd_seq_oss_synth_register,
  80                 snd_seq_oss_synth_unregister,
  81         };
  82
  83         snd_seq_autoload_lock();
  84         if ((rc = register_device()) < 0)
  85                 goto error;
  86         if ((rc = register_proc()) < 0) {
  87                 unregister_device();
  88                 goto error;
  89         }
  90         if ((rc = snd_seq_oss_create_client()) < 0) {
  91                 unregister_proc();
  92                 unregister_device();
  93                 goto error;
  94         }
  95
  96         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
  97                                                  sizeof(struct snd_seq_oss_reg))) < 0) {
  98                 snd_seq_oss_delete_client();
  99                 unregister_proc();
 100                 unregister_device();
 101                 goto error;
 102         }
 103
 104         /* success */
 105         snd_seq_oss_synth_init();
 106
 107  error:
 108         snd_seq_autoload_unlock();
 109         return rc;
 110 }
 111
 112 static void __exit alsa_seq_oss_exit(void)
 113 {
 114         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
 115         snd_seq_oss_delete_client();
 116         unregister_proc();
 117         unregister_device();
 118 }
 119
 120 module_init(alsa_seq_oss_init)
 121 module_exit(alsa_seq_oss_exit)
 122
 123 /*
 124  * ALSA minor device interface
 125  */
 126
 127 static DEFINE_MUTEX(register_mutex);
 128
 129 static int
 130 odev_open(struct inode *inode, struct file *file)
 131 {
 132         int level, rc;
 133
 134         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 135                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 136         else
 137                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 138
 139         mutex_lock(&register_mutex);
 140         rc = snd_seq_oss_open(file, level);
 141         mutex_unlock(&register_mutex);
 142
 143         return rc;
 144 }
 145
 146 static int
 147 odev_release(struct inode *inode, struct file *file)
 148 {
 149         struct seq_oss_devinfo *dp;
 150
 151         if ((dp = file->private_data) == NULL)
 152                 return 0;
 153
 154         snd_seq_oss_drain_write(dp);
 155
 156         mutex_lock(&register_mutex);
 157         snd_seq_oss_release(dp);
 158         mutex_unlock(&register_mutex);
 159
 160         return 0;
 161 }
 162
 163 static ssize_t
 164 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 165 {
 166         struct seq_oss_devinfo *dp;
 167         dp = file->private_data;
 168         snd_assert(dp != NULL, return -EIO);
 169         return snd_seq_oss_read(dp, buf, count);
 170 }
 171
 172
 173 static ssize_t
 174 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 175 {
 176         struct seq_oss_devinfo *dp;
 177         dp = file->private_data;
 178         snd_assert(dp != NULL, return -EIO);
 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         snd_assert(dp != NULL, return -EIO);
 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         snd_assert(dp != NULL, return 0);
 203         return snd_seq_oss_poll(dp, file, wait);
 204 }
 205
 206 /*
 207  * registration of sequencer minor device
 208  */
 209
 210 static const struct file_operations seq_oss_f_ops =
 211 {
 212         .owner =        THIS_MODULE,
 213         .read =         odev_read,
 214         .write =        odev_write,
 215         .open =         odev_open,
 216         .release =      odev_release,
 217         .poll =         odev_poll,
 218         .unlocked_ioctl =       odev_ioctl,
 219         .compat_ioctl = odev_ioctl_compat,
 220 };
 221
 222 static int __init
 223 register_device(void)
 224 {
 225         int rc;
 226
 227         mutex_lock(&register_mutex);
 228         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 229                                           NULL, 0,
 230                                           &seq_oss_f_ops, NULL,
 231                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 232                 snd_printk(KERN_ERR "can't register device seq\n");
 233                 mutex_unlock(&register_mutex);
 234                 return rc;
 235         }
 236         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 237                                           NULL, 0,
 238                                           &seq_oss_f_ops, NULL,
 239                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 240                 snd_printk(KERN_ERR "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         debug_printk(("device registered\n"));
 246         mutex_unlock(&register_mutex);
 247         return 0;
 248 }
 249
 250 static void
 251 unregister_device(void)
 252 {
 253         mutex_lock(&register_mutex);
 254         debug_printk(("device unregistered\n"));
 255         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 256                 snd_printk(KERN_ERR "error unregister device music\n");
 257         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 258                 snd_printk(KERN_ERR "error unregister device seq\n");
 259         mutex_unlock(&register_mutex);
 260 }
 261
 262 /*
 263  * /proc interface
 264  */
 265
 266 #ifdef CONFIG_PROC_FS
 267
 268 static struct snd_info_entry *info_entry;
 269
 270 static void
 271 info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
 272 {
 273         mutex_lock(&register_mutex);
 274         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
 275         snd_seq_oss_system_info_read(buf);
 276         snd_seq_oss_synth_info_read(buf);
 277         snd_seq_oss_midi_info_read(buf);
 278         mutex_unlock(&register_mutex);
 279 }
 280
 281
 282 static int __init
 283 register_proc(void)
 284 {
 285         struct snd_info_entry *entry;
 286
 287         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
 288         if (entry == NULL)
 289                 return -ENOMEM;
 290
 291         entry->content = SNDRV_INFO_CONTENT_TEXT;
 292         entry->private_data = NULL;
 293         entry->c.text.read = info_read;
 294         if (snd_info_register(entry) < 0) {
 295                 snd_info_free_entry(entry);
 296                 return -ENOMEM;
 297         }
 298         info_entry = entry;
 299         return 0;
 300 }
 301
 302 static void
 303 unregister_proc(void)
 304 {
 305         snd_info_free_entry(info_entry);
 306         info_entry = NULL;
 307 }
 308 #endif /* CONFIG_PROC_FS */