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-rw-r--r--drivers/iio/industrialio-buffer.c10
-rw-r--r--include/linux/iio/buffer.h3
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 7f9152c3c4d3..4dcc3a0f9930 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -37,6 +37,14 @@ static bool iio_buffer_is_active(struct iio_buffer *buf)
return !list_empty(&buf->buffer_list);
}
+static bool iio_buffer_data_available(struct iio_buffer *buf)
+{
+ if (buf->access->data_available)
+ return buf->access->data_available(buf);
+
+ return buf->stufftoread;
+}
+
/**
* iio_buffer_read_first_n_outer() - chrdev read for buffer access
*
@@ -70,7 +78,7 @@ unsigned int iio_buffer_poll(struct file *filp,
return -ENODEV;
poll_wait(filp, &rb->pollq, wait);
- if (rb->stufftoread)
+ if (iio_buffer_data_available(rb))
return POLLIN | POLLRDNORM;
/* need a way of knowing if there may be enough data... */
return 0;
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 15607b45221a..519392763393 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -21,6 +21,8 @@ struct iio_buffer;
* struct iio_buffer_access_funcs - access functions for buffers.
* @store_to: actually store stuff to the buffer
* @read_first_n: try to get a specified number of bytes (must exist)
+ * @data_available: indicates whether data for reading from the buffer is
+ * available.
* @request_update: if a parameter change has been marked, update underlying
* storage.
* @get_bytes_per_datum:get current bytes per datum
@@ -43,6 +45,7 @@ struct iio_buffer_access_funcs {
int (*read_first_n)(struct iio_buffer *buffer,
size_t n,
char __user *buf);
+ bool (*data_available)(struct iio_buffer *buffer);
int (*request_update)(struct iio_buffer *buffer);