309 lines
7.3 KiB
C
309 lines
7.3 KiB
C
/*
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* OSS compatible sequencer driver
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*
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* registration of device and proc
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*
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* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <sound/driver.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/initval.h>
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#include "seq_oss_device.h"
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#include "seq_oss_synth.h"
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/*
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* module option
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*/
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MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
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MODULE_DESCRIPTION("OSS-compatible sequencer module");
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MODULE_LICENSE("GPL");
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/* Takashi says this is really only for sound-service-0-, but this is OK. */
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MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);
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MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);
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#ifdef SNDRV_SEQ_OSS_DEBUG
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module_param(seq_oss_debug, int, 0644);
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MODULE_PARM_DESC(seq_oss_debug, "debug option");
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int seq_oss_debug = 0;
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#endif
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/*
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* prototypes
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*/
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static int register_device(void);
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static void unregister_device(void);
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#ifdef CONFIG_PROC_FS
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static int register_proc(void);
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static void unregister_proc(void);
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#else
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static inline int register_proc(void) { return 0; }
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static inline void unregister_proc(void) {}
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#endif
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static int odev_open(struct inode *inode, struct file *file);
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static int odev_release(struct inode *inode, struct file *file);
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static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);
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static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);
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static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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static unsigned int odev_poll(struct file *file, poll_table * wait);
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/*
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* module interface
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*/
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static int __init alsa_seq_oss_init(void)
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{
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int rc;
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static struct snd_seq_dev_ops ops = {
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snd_seq_oss_synth_register,
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snd_seq_oss_synth_unregister,
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};
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snd_seq_autoload_lock();
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if ((rc = register_device()) < 0)
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goto error;
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if ((rc = register_proc()) < 0) {
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unregister_device();
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goto error;
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}
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if ((rc = snd_seq_oss_create_client()) < 0) {
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unregister_proc();
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unregister_device();
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goto error;
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}
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if ((rc = snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OSS, &ops,
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sizeof(struct snd_seq_oss_reg))) < 0) {
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snd_seq_oss_delete_client();
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unregister_proc();
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unregister_device();
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goto error;
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}
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/* success */
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snd_seq_oss_synth_init();
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error:
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snd_seq_autoload_unlock();
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return rc;
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}
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static void __exit alsa_seq_oss_exit(void)
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{
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snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OSS);
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snd_seq_oss_delete_client();
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unregister_proc();
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unregister_device();
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}
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module_init(alsa_seq_oss_init)
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module_exit(alsa_seq_oss_exit)
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/*
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* ALSA minor device interface
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*/
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static DEFINE_MUTEX(register_mutex);
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static int
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odev_open(struct inode *inode, struct file *file)
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{
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int level, rc;
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if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)
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level = SNDRV_SEQ_OSS_MODE_MUSIC;
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else
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level = SNDRV_SEQ_OSS_MODE_SYNTH;
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mutex_lock(®ister_mutex);
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rc = snd_seq_oss_open(file, level);
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mutex_unlock(®ister_mutex);
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return rc;
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}
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static int
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odev_release(struct inode *inode, struct file *file)
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{
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struct seq_oss_devinfo *dp;
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if ((dp = file->private_data) == NULL)
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return 0;
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snd_seq_oss_drain_write(dp);
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mutex_lock(®ister_mutex);
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snd_seq_oss_release(dp);
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mutex_unlock(®ister_mutex);
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return 0;
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}
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static ssize_t
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odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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struct seq_oss_devinfo *dp;
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dp = file->private_data;
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snd_assert(dp != NULL, return -EIO);
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return snd_seq_oss_read(dp, buf, count);
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}
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static ssize_t
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odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
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{
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struct seq_oss_devinfo *dp;
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dp = file->private_data;
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snd_assert(dp != NULL, return -EIO);
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return snd_seq_oss_write(dp, buf, count, file);
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}
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static long
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odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct seq_oss_devinfo *dp;
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dp = file->private_data;
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snd_assert(dp != NULL, return -EIO);
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return snd_seq_oss_ioctl(dp, cmd, arg);
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}
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#ifdef CONFIG_COMPAT
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#define odev_ioctl_compat odev_ioctl
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#else
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#define odev_ioctl_compat NULL
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#endif
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static unsigned int
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odev_poll(struct file *file, poll_table * wait)
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{
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struct seq_oss_devinfo *dp;
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dp = file->private_data;
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snd_assert(dp != NULL, return 0);
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return snd_seq_oss_poll(dp, file, wait);
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}
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/*
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* registration of sequencer minor device
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*/
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static const struct file_operations seq_oss_f_ops =
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{
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.owner = THIS_MODULE,
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.read = odev_read,
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.write = odev_write,
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.open = odev_open,
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.release = odev_release,
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.poll = odev_poll,
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.unlocked_ioctl = odev_ioctl,
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.compat_ioctl = odev_ioctl_compat,
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};
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static int __init
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register_device(void)
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{
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int rc;
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mutex_lock(®ister_mutex);
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if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
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NULL, 0,
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&seq_oss_f_ops, NULL,
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SNDRV_SEQ_OSS_DEVNAME)) < 0) {
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snd_printk(KERN_ERR "can't register device seq\n");
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mutex_unlock(®ister_mutex);
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return rc;
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}
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if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
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NULL, 0,
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&seq_oss_f_ops, NULL,
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SNDRV_SEQ_OSS_DEVNAME)) < 0) {
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snd_printk(KERN_ERR "can't register device music\n");
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snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
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mutex_unlock(®ister_mutex);
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return rc;
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}
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debug_printk(("device registered\n"));
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mutex_unlock(®ister_mutex);
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return 0;
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}
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static void
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unregister_device(void)
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{
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mutex_lock(®ister_mutex);
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debug_printk(("device unregistered\n"));
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if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0)
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snd_printk(KERN_ERR "error unregister device music\n");
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if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)
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snd_printk(KERN_ERR "error unregister device seq\n");
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mutex_unlock(®ister_mutex);
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}
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/*
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* /proc interface
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*/
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#ifdef CONFIG_PROC_FS
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static struct snd_info_entry *info_entry;
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static void
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info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)
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{
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mutex_lock(®ister_mutex);
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snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);
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snd_seq_oss_system_info_read(buf);
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snd_seq_oss_synth_info_read(buf);
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snd_seq_oss_midi_info_read(buf);
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mutex_unlock(®ister_mutex);
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}
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static int __init
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register_proc(void)
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{
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struct snd_info_entry *entry;
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entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);
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if (entry == NULL)
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return -ENOMEM;
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entry->content = SNDRV_INFO_CONTENT_TEXT;
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entry->private_data = NULL;
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entry->c.text.read = info_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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return -ENOMEM;
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}
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info_entry = entry;
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return 0;
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}
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static void
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unregister_proc(void)
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{
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snd_info_free_entry(info_entry);
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info_entry = NULL;
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}
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#endif /* CONFIG_PROC_FS */
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