331 lines
7.3 KiB
C
331 lines
7.3 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* fireworks_hwdep.c - a part of driver for Fireworks based devices
|
||
|
|
*
|
||
|
|
* Copyright (c) 2013-2014 Takashi Sakamoto
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This codes have five functionalities.
|
||
|
|
*
|
||
|
|
* 1.get information about firewire node
|
||
|
|
* 2.get notification about starting/stopping stream
|
||
|
|
* 3.lock/unlock streaming
|
||
|
|
* 4.transmit command of EFW transaction
|
||
|
|
* 5.receive response of EFW transaction
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fireworks.h"
|
||
|
|
|
||
|
|
static long
|
||
|
|
hwdep_read_resp_buf(struct snd_efw *efw, char __user *buf, long remained,
|
||
|
|
loff_t *offset)
|
||
|
|
{
|
||
|
|
unsigned int length, till_end, type;
|
||
|
|
struct snd_efw_transaction *t;
|
||
|
|
u8 *pull_ptr;
|
||
|
|
long count = 0;
|
||
|
|
|
||
|
|
if (remained < sizeof(type) + sizeof(struct snd_efw_transaction))
|
||
|
|
return -ENOSPC;
|
||
|
|
|
||
|
|
/* data type is SNDRV_FIREWIRE_EVENT_EFW_RESPONSE */
|
||
|
|
type = SNDRV_FIREWIRE_EVENT_EFW_RESPONSE;
|
||
|
|
if (copy_to_user(buf, &type, sizeof(type)))
|
||
|
|
return -EFAULT;
|
||
|
|
count += sizeof(type);
|
||
|
|
remained -= sizeof(type);
|
||
|
|
buf += sizeof(type);
|
||
|
|
|
||
|
|
/* write into buffer as many responses as possible */
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* When another task reaches here during this task's access to user
|
||
|
|
* space, it picks up current position in buffer and can read the same
|
||
|
|
* series of responses.
|
||
|
|
*/
|
||
|
|
pull_ptr = efw->pull_ptr;
|
||
|
|
|
||
|
|
while (efw->push_ptr != pull_ptr) {
|
||
|
|
t = (struct snd_efw_transaction *)(pull_ptr);
|
||
|
|
length = be32_to_cpu(t->length) * sizeof(__be32);
|
||
|
|
|
||
|
|
/* confirm enough space for this response */
|
||
|
|
if (remained < length)
|
||
|
|
break;
|
||
|
|
|
||
|
|
/* copy from ring buffer to user buffer */
|
||
|
|
while (length > 0) {
|
||
|
|
till_end = snd_efw_resp_buf_size -
|
||
|
|
(unsigned int)(pull_ptr - efw->resp_buf);
|
||
|
|
till_end = min_t(unsigned int, length, till_end);
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
if (copy_to_user(buf, pull_ptr, till_end))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
pull_ptr += till_end;
|
||
|
|
if (pull_ptr >= efw->resp_buf + snd_efw_resp_buf_size)
|
||
|
|
pull_ptr -= snd_efw_resp_buf_size;
|
||
|
|
|
||
|
|
length -= till_end;
|
||
|
|
buf += till_end;
|
||
|
|
count += till_end;
|
||
|
|
remained -= till_end;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* All of tasks can read from the buffer nearly simultaneously, but the
|
||
|
|
* last position for each task is different depending on the length of
|
||
|
|
* given buffer. Here, for simplicity, a position of buffer is set by
|
||
|
|
* the latest task. It's better for a listening application to allow one
|
||
|
|
* thread to read from the buffer. Unless, each task can read different
|
||
|
|
* sequence of responses depending on variation of buffer length.
|
||
|
|
*/
|
||
|
|
efw->pull_ptr = pull_ptr;
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static long
|
||
|
|
hwdep_read_locked(struct snd_efw *efw, char __user *buf, long count,
|
||
|
|
loff_t *offset)
|
||
|
|
{
|
||
|
|
union snd_firewire_event event = {
|
||
|
|
.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
|
||
|
|
};
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
event.lock_status.status = (efw->dev_lock_count > 0);
|
||
|
|
efw->dev_lock_changed = false;
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
count = min_t(long, count, sizeof(event.lock_status));
|
||
|
|
|
||
|
|
if (copy_to_user(buf, &event, count))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static long
|
||
|
|
hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
|
||
|
|
loff_t *offset)
|
||
|
|
{
|
||
|
|
struct snd_efw *efw = hwdep->private_data;
|
||
|
|
DEFINE_WAIT(wait);
|
||
|
|
bool dev_lock_changed;
|
||
|
|
bool queued;
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
dev_lock_changed = efw->dev_lock_changed;
|
||
|
|
queued = efw->push_ptr != efw->pull_ptr;
|
||
|
|
|
||
|
|
while (!dev_lock_changed && !queued) {
|
||
|
|
prepare_to_wait(&efw->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
schedule();
|
||
|
|
finish_wait(&efw->hwdep_wait, &wait);
|
||
|
|
if (signal_pending(current))
|
||
|
|
return -ERESTARTSYS;
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
dev_lock_changed = efw->dev_lock_changed;
|
||
|
|
queued = efw->push_ptr != efw->pull_ptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
if (dev_lock_changed)
|
||
|
|
count = hwdep_read_locked(efw, buf, count, offset);
|
||
|
|
else if (queued)
|
||
|
|
count = hwdep_read_resp_buf(efw, buf, count, offset);
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static long
|
||
|
|
hwdep_write(struct snd_hwdep *hwdep, const char __user *data, long count,
|
||
|
|
loff_t *offset)
|
||
|
|
{
|
||
|
|
struct snd_efw *efw = hwdep->private_data;
|
||
|
|
u32 seqnum;
|
||
|
|
u8 *buf;
|
||
|
|
|
||
|
|
if (count < sizeof(struct snd_efw_transaction) ||
|
||
|
|
SND_EFW_RESPONSE_MAXIMUM_BYTES < count)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
buf = memdup_user(data, count);
|
||
|
|
if (IS_ERR(buf))
|
||
|
|
return PTR_ERR(buf);
|
||
|
|
|
||
|
|
/* check seqnum is not for kernel-land */
|
||
|
|
seqnum = be32_to_cpu(((struct snd_efw_transaction *)buf)->seqnum);
|
||
|
|
if (seqnum > SND_EFW_TRANSACTION_USER_SEQNUM_MAX) {
|
||
|
|
count = -EINVAL;
|
||
|
|
goto end;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (snd_efw_transaction_cmd(efw->unit, buf, count) < 0)
|
||
|
|
count = -EIO;
|
||
|
|
end:
|
||
|
|
kfree(buf);
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __poll_t
|
||
|
|
hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
|
||
|
|
{
|
||
|
|
struct snd_efw *efw = hwdep->private_data;
|
||
|
|
__poll_t events;
|
||
|
|
|
||
|
|
poll_wait(file, &efw->hwdep_wait, wait);
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
if (efw->dev_lock_changed || efw->pull_ptr != efw->push_ptr)
|
||
|
|
events = EPOLLIN | EPOLLRDNORM;
|
||
|
|
else
|
||
|
|
events = 0;
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
return events | EPOLLOUT;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
hwdep_get_info(struct snd_efw *efw, void __user *arg)
|
||
|
|
{
|
||
|
|
struct fw_device *dev = fw_parent_device(efw->unit);
|
||
|
|
struct snd_firewire_get_info info;
|
||
|
|
|
||
|
|
memset(&info, 0, sizeof(info));
|
||
|
|
info.type = SNDRV_FIREWIRE_TYPE_FIREWORKS;
|
||
|
|
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_efw *efw)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
if (efw->dev_lock_count == 0) {
|
||
|
|
efw->dev_lock_count = -1;
|
||
|
|
err = 0;
|
||
|
|
} else {
|
||
|
|
err = -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
hwdep_unlock(struct snd_efw *efw)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
|
||
|
|
if (efw->dev_lock_count == -1) {
|
||
|
|
efw->dev_lock_count = 0;
|
||
|
|
err = 0;
|
||
|
|
} else {
|
||
|
|
err = -EBADFD;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
hwdep_release(struct snd_hwdep *hwdep, struct file *file)
|
||
|
|
{
|
||
|
|
struct snd_efw *efw = hwdep->private_data;
|
||
|
|
|
||
|
|
spin_lock_irq(&efw->lock);
|
||
|
|
if (efw->dev_lock_count == -1)
|
||
|
|
efw->dev_lock_count = 0;
|
||
|
|
spin_unlock_irq(&efw->lock);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
|
||
|
|
unsigned int cmd, unsigned long arg)
|
||
|
|
{
|
||
|
|
struct snd_efw *efw = hwdep->private_data;
|
||
|
|
|
||
|
|
switch (cmd) {
|
||
|
|
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
|
||
|
|
return hwdep_get_info(efw, (void __user *)arg);
|
||
|
|
case SNDRV_FIREWIRE_IOCTL_LOCK:
|
||
|
|
return hwdep_lock(efw);
|
||
|
|
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
|
||
|
|
return hwdep_unlock(efw);
|
||
|
|
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_efw_create_hwdep_device(struct snd_efw *efw)
|
||
|
|
{
|
||
|
|
static const struct snd_hwdep_ops ops = {
|
||
|
|
.read = hwdep_read,
|
||
|
|
.write = hwdep_write,
|
||
|
|
.release = hwdep_release,
|
||
|
|
.poll = hwdep_poll,
|
||
|
|
.ioctl = hwdep_ioctl,
|
||
|
|
.ioctl_compat = hwdep_compat_ioctl,
|
||
|
|
};
|
||
|
|
struct snd_hwdep *hwdep;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = snd_hwdep_new(efw->card, "Fireworks", 0, &hwdep);
|
||
|
|
if (err < 0)
|
||
|
|
goto end;
|
||
|
|
strcpy(hwdep->name, "Fireworks");
|
||
|
|
hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREWORKS;
|
||
|
|
hwdep->ops = ops;
|
||
|
|
hwdep->private_data = efw;
|
||
|
|
hwdep->exclusive = true;
|
||
|
|
end:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|