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305 lines
6.7 KiB
305 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/compat.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 <[email protected]>"); |
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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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/* |
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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_SND_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 __poll_t 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 struct snd_seq_driver seq_oss_synth_driver = { |
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.driver = { |
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.name = KBUILD_MODNAME, |
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.probe = snd_seq_oss_synth_probe, |
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.remove = snd_seq_oss_synth_remove, |
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}, |
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.id = SNDRV_SEQ_DEV_ID_OSS, |
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.argsize = sizeof(struct snd_seq_oss_reg), |
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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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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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rc = snd_seq_driver_register(&seq_oss_synth_driver); |
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if (rc < 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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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_driver_unregister(&seq_oss_synth_driver); |
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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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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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if (snd_BUG_ON(!dp)) |
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return -ENXIO; |
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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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if (snd_BUG_ON(!dp)) |
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return -ENXIO; |
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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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long rc; |
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dp = file->private_data; |
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if (snd_BUG_ON(!dp)) |
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return -ENXIO; |
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if (cmd != SNDCTL_SEQ_SYNC && |
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mutex_lock_interruptible(®ister_mutex)) |
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return -ERESTARTSYS; |
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rc = snd_seq_oss_ioctl(dp, cmd, arg); |
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if (cmd != SNDCTL_SEQ_SYNC) |
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mutex_unlock(®ister_mutex); |
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return rc; |
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} |
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#ifdef CONFIG_COMPAT |
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static long odev_ioctl_compat(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
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} |
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#else |
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#define odev_ioctl_compat NULL |
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#endif |
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static __poll_t |
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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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if (snd_BUG_ON(!dp)) |
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return EPOLLERR; |
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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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.llseek = noop_llseek, |
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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)) < 0) { |
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pr_err("ALSA: seq_oss: 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)) < 0) { |
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pr_err("ALSA: seq_oss: 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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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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if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) |
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pr_err("ALSA: seq_oss: 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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pr_err("ALSA: seq_oss: 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_SND_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_SND_PROC_FS */
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