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 <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 static int register_proc(void);
  56 static void unregister_proc(void);
  57
  58 static int odev_open(struct inode *inode, struct file *file);
  59 static int odev_release(struct inode *inode, struct file *file);
  60 static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
  61 static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
  62 static int odev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
  63 static unsigned int odev_poll(struct file *file, poll_table * wait);
  64 #ifdef CONFIG_PROC_FS
  65 static void info_read(snd_info_entry_t *entry, snd_info_buffer_t *buf);
  66 #endif
  67
  68
  69 /*
  70  * module interface
  71  */
  72
  73 static int __init alsa_seq_oss_init(void)
  74 {
  75         int rc;
  76         static snd_seq_dev_ops_t ops = {
  77                 snd_seq_oss_synth_register,
  78                 snd_seq_oss_synth_unregister,
  79         };
  80
  81         if ((rc = register_device()) < 0)
  82                 return rc;
  83         if ((rc = register_proc()) < 0) {
  84                 unregister_device();
  85                 return rc;
  86         }
  87         if ((rc = snd_seq_oss_create_client()) < 0) {
  88                 unregister_proc();
  89                 unregister_device();
  90                 return rc;
  91         }
  92
  93         if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
  94                                                  sizeof(snd_seq_oss_reg_t))) < 0) {
  95                 snd_seq_oss_delete_client();
  96                 unregister_proc();
  97                 unregister_device();
  98                 return rc;
  99         }
 100
 101         /* success */
 102         snd_seq_oss_synth_init();
 103         return 0;
 104 }
 105
 106 static void __exit alsa_seq_oss_exit(void)
 107 {
 108         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
 109         snd_seq_oss_delete_client();
 110         unregister_proc();
 111         unregister_device();
 112 }
 113
 114 module_init(alsa_seq_oss_init)
 115 module_exit(alsa_seq_oss_exit)
 116
 117 /*
 118  * ALSA minor device interface
 119  */
 120
 121 static DECLARE_MUTEX(register_mutex);
 122
 123 static int
 124 odev_open(struct inode *inode, struct file *file)
 125 {
 126         int level, rc;
 127
 128         if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
 129                 level = SNDRV_SEQ_OSS_MODE_MUSIC;
 130         else
 131                 level = SNDRV_SEQ_OSS_MODE_SYNTH;
 132
 133         down(&register_mutex);
 134         rc = snd_seq_oss_open(file, level);
 135         up(&register_mutex);
 136
 137         return rc;
 138 }
 139
 140 static int
 141 odev_release(struct inode *inode, struct file *file)
 142 {
 143         seq_oss_devinfo_t *dp;
 144
 145         if ((dp = file->private_data) == NULL)
 146                 return 0;
 147
 148         snd_seq_oss_drain_write(dp);
 149
 150         down(&register_mutex);
 151         snd_seq_oss_release(dp);
 152         up(&register_mutex);
 153
 154         return 0;
 155 }
 156
 157 static ssize_t
 158 odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 159 {
 160         seq_oss_devinfo_t *dp;
 161         dp = file->private_data;
 162         snd_assert(dp != NULL, return -EIO);
 163         return snd_seq_oss_read(dp, buf, count);
 164 }
 165
 166
 167 static ssize_t
 168 odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 169 {
 170         seq_oss_devinfo_t *dp;
 171         dp = file->private_data;
 172         snd_assert(dp != NULL, return -EIO);
 173         return snd_seq_oss_write(dp, buf, count, file);
 174 }
 175
 176 static int
 177 odev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 178 {
 179         seq_oss_devinfo_t *dp;
 180         int err;
 181         dp = file->private_data;
 182         snd_assert(dp != NULL, return -EIO);
 183         /* FIXME: need to unlock BKL to allow preemption */
 184         unlock_kernel();
 185         err = snd_seq_oss_ioctl(dp, cmd, arg);
 186         lock_kernel();
 187         return err;
 188 }
 189
 190
 191 static unsigned int
 192 odev_poll(struct file *file, poll_table * wait)
 193 {
 194         seq_oss_devinfo_t *dp;
 195         dp = file->private_data;
 196         snd_assert(dp != NULL, return 0);
 197         return snd_seq_oss_poll(dp, file, wait);
 198 }
 199
 200 /*
 201  * registration of sequencer minor device
 202  */
 203
 204 static struct file_operations seq_oss_f_ops =
 205 {
 206         .owner =        THIS_MODULE,
 207         .read =         odev_read,
 208         .write =        odev_write,
 209         .open =         odev_open,
 210         .release =      odev_release,
 211         .poll =         odev_poll,
 212         .ioctl =        odev_ioctl,
 213 };
 214
 215 static snd_minor_t seq_oss_reg = {
 216         .comment =      "sequencer",
 217         .f_ops =        &seq_oss_f_ops,
 218 };
 219
 220 static int __init
 221 register_device(void)
 222 {
 223         int rc;
 224
 225         down(&register_mutex);
 226         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 227                                           NULL, 0,
 228                                           &seq_oss_reg,
 229                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 230                 snd_printk(KERN_ERR "can't register device seq\n");
 231                 up(&register_mutex);
 232                 return rc;
 233         }
 234         if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 235                                           NULL, 0,
 236                                           &seq_oss_reg,
 237                                           SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 238                 snd_printk(KERN_ERR "can't register device music\n");
 239                 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
 240                 up(&register_mutex);
 241                 return rc;
 242         }
 243         debug_printk(("device registered\n"));
 244         up(&register_mutex);
 245         return 0;
 246 }
 247
 248 static void
 249 unregister_device(void)
 250 {
 251         down(&register_mutex);
 252         debug_printk(("device unregistered\n"));
 253         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
 254                 snd_printk(KERN_ERR "error unregister device music\n");
 255         if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
 256                 snd_printk(KERN_ERR "error unregister device seq\n");
 257         up(&register_mutex);
 258 }
 259
 260 /*
 261  * /proc interface
 262  */
 263
 264 #ifdef CONFIG_PROC_FS
 265
 266 static snd_info_entry_t *info_entry;
 267
 268 static void
 269 info_read(snd_info_entry_t *entry, snd_info_buffer_t *buf)
 270 {
 271         down(&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         up(&register_mutex);
 277 }
 278
 279 #endif /* CONFIG_PROC_FS */
 280
 281 static int __init
 282 register_proc(void)
 283 {
 284 #ifdef CONFIG_PROC_FS
 285         snd_info_entry_t *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_size = 1024;
 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 #endif
 301         return 0;
 302 }
 303
 304 static void
 305 unregister_proc(void)
 306 {
 307 #ifdef CONFIG_PROC_FS
 308         if (info_entry)
 309                 snd_info_unregister(info_entry);
 310         info_entry = NULL;
 311 #endif
 312 }