/*
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* bebob_hwdep.c - a part of driver for BeBoB based devices
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*
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* Copyright (c) 2013-2014 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 infomation
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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 "bebob.h"
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static long
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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_bebob *bebob = 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(&bebob->lock);
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while (!bebob->dev_lock_changed) {
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prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
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spin_unlock_irq(&bebob->lock);
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schedule();
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finish_wait(&bebob->hwdep_wait, &wait);
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if (signal_pending(current))
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return -ERESTARTSYS;
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spin_lock_irq(&bebob->lock);
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}
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memset(&event, 0, sizeof(event));
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count = min_t(long, count, sizeof(event.lock_status));
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if (bebob->dev_lock_changed) {
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event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
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event.lock_status.status = (bebob->dev_lock_count > 0);
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bebob->dev_lock_changed = false;
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}
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spin_unlock_irq(&bebob->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
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hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
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{
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struct snd_bebob *bebob = hwdep->private_data;
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__poll_t events;
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poll_wait(file, &bebob->hwdep_wait, wait);
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spin_lock_irq(&bebob->lock);
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if (bebob->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(&bebob->lock);
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return events;
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}
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static int
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hwdep_get_info(struct snd_bebob *bebob, void __user *arg)
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{
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struct fw_device *dev = fw_parent_device(bebob->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_BEBOB;
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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
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hwdep_lock(struct snd_bebob *bebob)
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{
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int err;
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spin_lock_irq(&bebob->lock);
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if (bebob->dev_lock_count == 0) {
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bebob->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(&bebob->lock);
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return err;
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}
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static int
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hwdep_unlock(struct snd_bebob *bebob)
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{
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int err;
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spin_lock_irq(&bebob->lock);
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if (bebob->dev_lock_count == -1) {
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bebob->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(&bebob->lock);
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return err;
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}
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static int
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hwdep_release(struct snd_hwdep *hwdep, struct file *file)
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{
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struct snd_bebob *bebob = hwdep->private_data;
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spin_lock_irq(&bebob->lock);
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if (bebob->dev_lock_count == -1)
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bebob->dev_lock_count = 0;
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spin_unlock_irq(&bebob->lock);
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return 0;
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}
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static int
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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_bebob *bebob = 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(bebob, (void __user *)arg);
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case SNDRV_FIREWIRE_IOCTL_LOCK:
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return hwdep_lock(bebob);
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case SNDRV_FIREWIRE_IOCTL_UNLOCK:
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return hwdep_unlock(bebob);
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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
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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_bebob_create_hwdep_device(struct snd_bebob *bebob)
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{
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static const struct snd_hwdep_ops 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(bebob->card, "BeBoB", 0, &hwdep);
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if (err < 0)
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goto end;
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strcpy(hwdep->name, "BeBoB");
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hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
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hwdep->ops = ops;
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hwdep->private_data = bebob;
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hwdep->exclusive = true;
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end:
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return err;
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}
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