Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-15 08:31:55 +00:00
Code Issues Packages Projects Releases Wiki Activity

iio: kfifo-buffer: Add output buffer support

Browse Source 
Add output buffer support to the kfifo buffer implementation.

The implementation is straight forward and mostly just wraps the kfifo
API to provide the required operations.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Mihail Chindris <mihail.chindris@analog.com>
Link: https://lore.kernel.org/r/20211007080035.2531-3-mihail.chindris@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lars-Peter Clausen 2021-10-07 08:00:31 +00:00 committed by Jonathan Cameron
parent 9eeee3b0bf
commit 1546d6718d
1 changed files with 50 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/iio/buffer/kfifo_buf.c
View File

@ -138,10 +138,60 @@ static void iio_kfifo_buffer_release(struct iio_buffer *buffer)
kfree(kf);
}
static size_t iio_kfifo_buf_space_available(struct iio_buffer *r)
{
struct iio_kfifo *kf = iio_to_kfifo(r);
size_t avail;
mutex_lock(&kf->user_lock);
avail = kfifo_avail(&kf->kf);
mutex_unlock(&kf->user_lock);
return avail;
}
static int iio_kfifo_remove_from(struct iio_buffer *r, void *data)
{
int ret;
struct iio_kfifo *kf = iio_to_kfifo(r);
if (kfifo_size(&kf->kf) < 1)
return -EBUSY;
ret = kfifo_out(&kf->kf, data, 1);
if (ret != 1)
return -EBUSY;
wake_up_interruptible_poll(&r->pollq, EPOLLOUT | EPOLLWRNORM);
return 0;
}
static int iio_kfifo_write(struct iio_buffer *r, size_t n,
const char __user *buf)
{
struct iio_kfifo *kf = iio_to_kfifo(r);
int ret, copied;
mutex_lock(&kf->user_lock);
if (!kfifo_initialized(&kf->kf) || n < kfifo_esize(&kf->kf))
ret = -EINVAL;
else
ret = kfifo_from_user(&kf->kf, buf, n, &copied);
mutex_unlock(&kf->user_lock);
if (ret)
return ret;
return copied;
}
static const struct iio_buffer_access_funcs kfifo_access_funcs = {
.store_to = &iio_store_to_kfifo,
.read = &iio_read_kfifo,
.data_available = iio_kfifo_buf_data_available,
.remove_from = &iio_kfifo_remove_from,
.write = &iio_kfifo_write,
.space_available = &iio_kfifo_buf_space_available,
.request_update = &iio_request_update_kfifo,
.set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,
.set_length = &iio_set_length_kfifo,