On Fri, 2021-08-20 at 16:59 +0000, Mihail Chindris wrote:
> From: Lars-Peter Clausen <lars@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
> Signed-off-by: Mihail Chindris <mihail.chindris@xxxxxxxxxx>
> ---
> drivers/iio/buffer/kfifo_buf.c | 50
> ++++++++++++++++++++++++++++++++++
> 1 file changed, 50 insertions(+)
>
> diff --git a/drivers/iio/buffer/kfifo_buf.c
> b/drivers/iio/buffer/kfifo_buf.c
> index 516eb3465de1..7368db2d5c32 100644
> --- a/drivers/iio/buffer/kfifo_buf.c
> +++ b/drivers/iio/buffer/kfifo_buf.c
> @@ -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, POLLOUT | POLLWRNORM);
> +
> + return 0;
> +}
> +
> +static int iio_kfifo_write(struct iio_buffer *r, size_t n,
> + const char __user *buf)
> +{
nit: I would align this with the open parenthesis...
- Nuno Sá
