2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 13:43:55 +08:00
linux-next/sound/firewire/fireworks/fireworks_hwdep.c
Linus Torvalds a9a08845e9 vfs: do bulk POLL* -> EPOLL* replacement
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>
2018-02-11 14:34:03 -08:00

331 lines
7.3 KiB
C

/*
* fireworks_hwdep.c - a part of driver for Fireworks based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
/*
* 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;
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]);
strlcpy(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;
}