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 <sound/core.h>
  26 #include <sound/minors.h>
  27 #include <sound/initval.h>
  28 #include "seq_oss_device.h"
  29 #include "seq_oss_synth.h"
  30
  31 /*
  32  * module option
  33  */
  34 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  35 MODULE_DESCRIPTION("OSS-compatible sequencer module");
  36 MODULE_LICENSE("GPL");
  37 MODULE_CLASSES("{sound}");
  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 #ifdef SNDRV_SEQ_OSS_DEBUG
  43 MODULE_PARM(seq_oss_debug, "i");
  44 MODULE_PARM_DESC(seq_oss_debug, "debug option");
  45 int seq_oss_debug = 0;
  46 #endif
  47
  48
  49 /*
  50  * prototypes
  51  */
  52 static int register_device(void);
  53 static void unregister_device(void);
  54 static int register_proc(void);
  55 static void unregister_proc(void);
  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 *buf, size_t count, loff_t *offset);
  60 static ssize_t odev_write(struct file *file, const char *buf, size_t count, loff_t *offset);
  61 static int odev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
  62 static unsigned int odev_poll(struct file *file, poll_table * wait);
  63 #ifdef CONFIG_PROC_FS
  64 static void info_read(snd_info_entry_t *entry, snd_info_buffer_t *buf);
  65 #endif
  66
  67
  68 /*
  69  * module interface
  70  */
  71
  72 static int __init alsa_seq_oss_init(void)
  73 {
  74         int rc;
  75         static snd_seq_dev_ops_t ops = {
  76                 snd_seq_oss_synth_register,
  77                 snd_seq_oss_synth_unregister,
  78         };
  79
  80         if ((rc = register_device()) < 0)
  81                 return rc;
  82         if ((rc = register_proc()) < 0) {
  83                 unregister_device();
  84                 return rc;
  85         }
  86         if ((rc = snd_seq_oss_create_client()) < 0) {
  87                 unregister_proc();
  88                 unregister_device();
  89                 return rc;
  90         }
  91
  92         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
  93                                                  sizeof(snd_seq_oss_reg_t))) < 0) {
  94                 snd_seq_oss_delete_client();
  95                 unregister_proc();
  96                 unregister_device();
  97                 return rc;
  98         }
  99
 100         /* success */
 101         snd_seq_oss_synth_init();
 102         return 0;
 103 }
 104
 105 static void __exit alsa_seq_oss_exit(void)
 106 {
 107         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
 108         snd_seq_oss_delete_client();
 109         unregister_proc();
 110         unregister_device();
 111 }
 112
 113 module_init(alsa_seq_oss_init)
 114 module_exit(alsa_seq_oss_exit)
 115
 116 /*
 117  * ALSA minor device interface
 118  */
 119
 120 static DECLARE_MUTEX(register_mutex);
 121
 122 static int
 123 odev_open(struct inode *inode, struct file *file)
 124 {
 125         int level, rc;
 126
 127         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 128                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 129         else
 130                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 131
 132         down(&register_mutex);
 133         rc = snd_seq_oss_open(file, level);
 134         up(&register_mutex);
 135
 136         return rc;
 137 }
 138
 139 static int
 140 odev_release(struct inode *inode, struct file *file)
 141 {
 142         seq_oss_devinfo_t *dp;
 143
 144         if ((dp = file->private_data) == NULL)
 145                 return 0;
 146
 147         snd_seq_oss_drain_write(dp);
 148
 149         down(&register_mutex);
 150         snd_seq_oss_release(dp);
 151         up(&register_mutex);
 152
 153         return 0;
 154 }
 155
 156 static ssize_t
 157 odev_read(struct file *file, char *buf, size_t count, loff_t *offset)
 158 {
 159         seq_oss_devinfo_t *dp;
 160         dp = file->private_data;
 161         snd_assert(dp != NULL, return -EIO);
 162         return snd_seq_oss_read(dp, buf, count);
 163 }
 164
 165
 166 static ssize_t
 167 odev_write(struct file *file, const char *buf, size_t count, loff_t *offset)
 168 {
 169         seq_oss_devinfo_t *dp;
 170         dp = file->private_data;
 171         snd_assert(dp != NULL, return -EIO);
 172         return snd_seq_oss_write(dp, buf, count, file);
 173 }
 174
 175 static int
 176 odev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 177 {
 178         seq_oss_devinfo_t *dp;
 179         dp = file->private_data;
 180         snd_assert(dp != NULL, return -EIO);
 181         return snd_seq_oss_ioctl(dp, cmd, arg);
 182 }
 183
 184
 185 static unsigned int
 186 odev_poll(struct file *file, poll_table * wait)
 187 {
 188         seq_oss_devinfo_t *dp;
 189         dp = file->private_data;
 190         snd_assert(dp != NULL, return 0);
 191         return snd_seq_oss_poll(dp, file, wait);
 192 }
 193
 194 /*
 195  * registration of sequencer minor device
 196  */
 197
 198 static struct file_operations seq_oss_f_ops =
 199 {
 200         .owner =        THIS_MODULE,
 201         .read =         odev_read,
 202         .write =        odev_write,
 203         .open =         odev_open,
 204         .release =      odev_release,
 205         .poll =         odev_poll,
 206         .ioctl =        odev_ioctl,
 207 };
 208
 209 static snd_minor_t seq_oss_reg = {
 210         .comment =      "sequencer",
 211         .f_ops =        &seq_oss_f_ops,
 212 };
 213
 214 static int __init
 215 register_device(void)
 216 {
 217         int rc;
 218
 219         down(&register_mutex);
 220         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 221                                           NULL, 0,
 222                                           &seq_oss_reg,
 223                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 224                 snd_printk(KERN_ERR "can't register device seq\n");
 225                 up(&register_mutex);
 226                 return rc;
 227         }
 228         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 229                                           NULL, 0,
 230                                           &seq_oss_reg,
 231                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 232                 snd_printk(KERN_ERR "can't register device music\n");
 233                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 234                 up(&register_mutex);
 235                 return rc;
 236         }
 237         debug_printk(("device registered\n"));
 238         up(&register_mutex);
 239         return 0;
 240 }
 241
 242 static void
 243 unregister_device(void)
 244 {
 245         down(&register_mutex);
 246         debug_printk(("device unregistered\n"));
 247         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 248                 snd_printk(KERN_ERR "error unregister device music\n");
 249         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 250                 snd_printk(KERN_ERR "error unregister device seq\n");
 251         up(&register_mutex);
 252 }
 253
 254 /*
 255  * /proc interface
 256  */
 257
 258 #ifdef CONFIG_PROC_FS
 259
 260 static snd_info_entry_t *info_entry;
 261
 262 static void
 263 info_read(snd_info_entry_t *entry, snd_info_buffer_t *buf)
 264 {
 265         down(&register_mutex);
 266         snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
 267         snd_seq_oss_system_info_read(buf);
 268         snd_seq_oss_synth_info_read(buf);
 269         snd_seq_oss_midi_info_read(buf);
 270         up(&register_mutex);
 271 }
 272
 273 #endif /* CONFIG_PROC_FS */
 274
 275 static int __init
 276 register_proc(void)
 277 {
 278 #ifdef CONFIG_PROC_FS
 279         snd_info_entry_t *entry;
 280
 281         entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
 282         if (entry == NULL)
 283                 return -ENOMEM;
 284
 285         entry->content = SNDRV_INFO_CONTENT_TEXT;
 286         entry->private_data = NULL;
 287         entry->c.text.read_size = 1024;
 288         entry->c.text.read = info_read;
 289         if (snd_info_register(entry) < 0) {
 290                 snd_info_free_entry(entry);
 291                 return -ENOMEM;
 292         }
 293         info_entry = entry;
 294 #endif
 295         return 0;
 296 }
 297
 298 static void
 299 unregister_proc(void)
 300 {
 301 #ifdef CONFIG_PROC_FS
 302         if (info_entry)
 303                 snd_info_unregister(info_entry);
 304         info_entry = NULL;
 305 #endif
 306 }