![Linus Torvalds](/assets/img/avatar_default.png)
This is the mindless scripted replacement of kernel use of POLL* variables as described by Al, done by this script: for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'` for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done done with de-mangling cleanups yet to come. NOTE! On almost all architectures, the EPOLL* constants have the same values as the POLL* constants do. But they keyword here is "almost". For various bad reasons they aren't the same, and epoll() doesn't actually work quite correctly in some cases due to this on Sparc et al. The next patch from Al will sort out the final differences, and we should be all done. Scripted-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
192 lines
4 KiB
C
192 lines
4 KiB
C
/*
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* ff-hwdep.c - a part of driver for RME Fireface series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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/*
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* This codes give three functionality.
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*
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* 1.get firewire node information
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* 2.get notification about starting/stopping stream
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* 3.lock/unlock stream
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*/
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#include "ff.h"
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static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
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loff_t *offset)
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{
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struct snd_ff *ff = hwdep->private_data;
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DEFINE_WAIT(wait);
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union snd_firewire_event event;
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spin_lock_irq(&ff->lock);
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while (!ff->dev_lock_changed) {
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prepare_to_wait(&ff->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
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spin_unlock_irq(&ff->lock);
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schedule();
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finish_wait(&ff->hwdep_wait, &wait);
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if (signal_pending(current))
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return -ERESTARTSYS;
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spin_lock_irq(&ff->lock);
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}
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memset(&event, 0, sizeof(event));
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if (ff->dev_lock_changed) {
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event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
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event.lock_status.status = (ff->dev_lock_count > 0);
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ff->dev_lock_changed = false;
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count = min_t(long, count, sizeof(event.lock_status));
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}
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spin_unlock_irq(&ff->lock);
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if (copy_to_user(buf, &event, count))
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return -EFAULT;
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return count;
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}
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static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
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poll_table *wait)
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{
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struct snd_ff *ff = hwdep->private_data;
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__poll_t events;
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poll_wait(file, &ff->hwdep_wait, wait);
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spin_lock_irq(&ff->lock);
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if (ff->dev_lock_changed)
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events = EPOLLIN | EPOLLRDNORM;
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else
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events = 0;
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spin_unlock_irq(&ff->lock);
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return events;
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}
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static int hwdep_get_info(struct snd_ff *ff, void __user *arg)
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{
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struct fw_device *dev = fw_parent_device(ff->unit);
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struct snd_firewire_get_info info;
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memset(&info, 0, sizeof(info));
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info.type = SNDRV_FIREWIRE_TYPE_FIREFACE;
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info.card = dev->card->index;
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*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
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*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
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strlcpy(info.device_name, dev_name(&dev->device),
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sizeof(info.device_name));
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if (copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int hwdep_lock(struct snd_ff *ff)
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{
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int err;
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spin_lock_irq(&ff->lock);
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if (ff->dev_lock_count == 0) {
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ff->dev_lock_count = -1;
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err = 0;
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} else {
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err = -EBUSY;
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}
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spin_unlock_irq(&ff->lock);
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return err;
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}
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static int hwdep_unlock(struct snd_ff *ff)
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{
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int err;
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spin_lock_irq(&ff->lock);
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if (ff->dev_lock_count == -1) {
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ff->dev_lock_count = 0;
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err = 0;
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} else {
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err = -EBADFD;
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}
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spin_unlock_irq(&ff->lock);
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return err;
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}
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static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
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{
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struct snd_ff *ff = hwdep->private_data;
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spin_lock_irq(&ff->lock);
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if (ff->dev_lock_count == -1)
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ff->dev_lock_count = 0;
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spin_unlock_irq(&ff->lock);
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return 0;
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}
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static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct snd_ff *ff = hwdep->private_data;
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switch (cmd) {
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case SNDRV_FIREWIRE_IOCTL_GET_INFO:
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return hwdep_get_info(ff, (void __user *)arg);
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case SNDRV_FIREWIRE_IOCTL_LOCK:
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return hwdep_lock(ff);
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case SNDRV_FIREWIRE_IOCTL_UNLOCK:
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return hwdep_unlock(ff);
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default:
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return -ENOIOCTLCMD;
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}
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}
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#ifdef CONFIG_COMPAT
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static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return hwdep_ioctl(hwdep, file, cmd,
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(unsigned long)compat_ptr(arg));
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}
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#else
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#define hwdep_compat_ioctl NULL
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#endif
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int snd_ff_create_hwdep_devices(struct snd_ff *ff)
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{
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static const struct snd_hwdep_ops hwdep_ops = {
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.read = hwdep_read,
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.release = hwdep_release,
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.poll = hwdep_poll,
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.ioctl = hwdep_ioctl,
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.ioctl_compat = hwdep_compat_ioctl,
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};
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struct snd_hwdep *hwdep;
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int err;
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err = snd_hwdep_new(ff->card, ff->card->driver, 0, &hwdep);
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if (err < 0)
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return err;
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strcpy(hwdep->name, ff->card->driver);
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hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREFACE;
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hwdep->ops = hwdep_ops;
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hwdep->private_data = ff;
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hwdep->exclusive = true;
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return 0;
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}
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