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// SPDX-License-Identifier: GPL-2.0-only
/*
* bebob_hwdep.c - a part of driver for BeBoB based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*/
/*
* This codes give three functionality.
*
* 1.get firewire node infomation
* 2.get notification about starting/stopping stream
* 3.lock/unlock stream
*/
#include "bebob.h"
static long
hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_bebob *bebob = hwdep->private_data;
DEFINE_WAIT(wait);
union snd_firewire_event event;
spin_lock_irq(&bebob->lock);
while (!bebob->dev_lock_changed) {
prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&bebob->lock);
schedule();
finish_wait(&bebob->hwdep_wait, &wait);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&bebob->lock);
}
memset(&event, 0, sizeof(event));
count = min_t(long, count, sizeof(event.lock_status));
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
event.lock_status.status = (bebob->dev_lock_count > 0);
bebob->dev_lock_changed = false;
spin_unlock_irq(&bebob->lock);
if (copy_to_user(buf, &event, count))
return -EFAULT;
return count;
}
static __poll_t
hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
{
struct snd_bebob *bebob = hwdep->private_data;
__poll_t events;
poll_wait(file, &bebob->hwdep_wait, wait);
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_changed)
events = EPOLLIN | EPOLLRDNORM;
else
events = 0;
spin_unlock_irq(&bebob->lock);
return events;
}
static int
hwdep_get_info(struct snd_bebob *bebob, void __user *arg)
{
struct fw_device *dev = fw_parent_device(bebob->unit);
struct snd_firewire_get_info info;
memset(&info, 0, sizeof(info));
info.type = SNDRV_FIREWIRE_TYPE_BEBOB;
info.card = dev->card->index;
*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
strscpy(info.device_name, dev_name(&dev->device),
sizeof(info.device_name));
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int
hwdep_lock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == 0) {
bebob->dev_lock_count = -1;
err = 0;
} else {
err = -EBUSY;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_unlock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1) {
bebob->dev_lock_count = 0;
err = 0;
} else {
err = -EBADFD;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_bebob *bebob = hwdep->private_data;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1)
bebob->dev_lock_count = 0;
spin_unlock_irq(&bebob->lock);
return 0;
}
static int
hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct snd_bebob *bebob = hwdep->private_data;
switch (cmd) {
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
return hwdep_get_info(bebob, (void __user *)arg);
case SNDRV_FIREWIRE_IOCTL_LOCK:
return hwdep_lock(bebob);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(bebob);
default:
return -ENOIOCTLCMD;
}
}
#ifdef CONFIG_COMPAT
static int
hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
return hwdep_ioctl(hwdep, file, cmd,
(unsigned long)compat_ptr(arg));
}
#else
#define hwdep_compat_ioctl NULL
#endif
int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
{
static const struct snd_hwdep_ops ops = {
.read = hwdep_read,
.release = hwdep_release,
.poll = hwdep_poll,
.ioctl = hwdep_ioctl,
.ioctl_compat = hwdep_compat_ioctl,
};
struct snd_hwdep *hwdep;
int err;
err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep);
if (err < 0)
goto end;
strcpy(hwdep->name, "BeBoB");
hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
hwdep->ops = ops;
hwdep->private_data = bebob;
hwdep->exclusive = true;
end:
return err;
}
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