Commit 7c388ec1 authored by Jonathan Cameron's avatar Jonathan Cameron
Browse files

iio: kfifo - add poll support. 



This buffer implementation was missing poll support.

Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
Tested-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarsrinivas pandruvada <srinivas.pandruvada@intel.com>
parent 08ce9b44

drivers/iio/kfifo_buf.c

+14 −1
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#include <linux/kfifo.h>

#include <linux/mutex.h>

#include <linux/iio/kfifo_buf.h>

#include <linux/sched.h>



struct iio_kfifo {

	struct iio_buffer buffer;
@@ -36,6 +37,7 @@ static int iio_request_update_kfifo(struct iio_buffer *r) 
	kfifo_free(&buf->kf);

	ret = __iio_allocate_kfifo(buf, buf->buffer.bytes_per_datum,

				   buf->buffer.length);

	r->stufftoread = false;

error_ret:

	return ret;

}
@@ -82,6 +84,9 @@ static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd) 


static int iio_set_length_kfifo(struct iio_buffer *r, int length)

{

	/* Avoid an invalid state */

	if (length < 2)

		length = 2;

	if (r->length != length) {

		r->length = length;

		iio_mark_update_needed_kfifo(r);
@@ -98,6 +103,8 @@ static int iio_store_to_kfifo(struct iio_buffer *r, 
	ret = kfifo_in(&kf->kf, data, 1);

	if (ret != 1)

		return -EBUSY;

	r->stufftoread = true;

	wake_up_interruptible(&r->pollq);



	return 0;

}
@@ -115,6 +122,12 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r, 
	if (ret < 0)

		return ret;



	if (kfifo_is_empty(&kf->kf))

		r->stufftoread = false;

	/* verify it is still empty to avoid race */

	if (!kfifo_is_empty(&kf->kf))

		r->stufftoread = true;



	return copied;

}
@@ -139,7 +152,7 @@ struct iio_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev) 
	iio_buffer_init(&kf->buffer);

	kf->buffer.attrs = &iio_kfifo_attribute_group;

	kf->buffer.access = &kfifo_access_funcs;



	kf->buffer.length = 2;

	return &kf->buffer;

}

EXPORT_SYMBOL(iio_kfifo_allocate);