iio: Add support for blocking IO on buffers
Currently the IIO buffer interface only allows non-blocking reads. This patch
adds support for blocking IO. In blocking mode the thread will go to sleep if no
data is available and will wait for the buffer implementation to signal that new
data is available by waking up the buffers waitqueue.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 4dcc3a0..c67d83b 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -56,13 +56,34 @@
{
struct iio_dev *indio_dev = filp->private_data;
struct iio_buffer *rb = indio_dev->buffer;
+ int ret;
if (!indio_dev->info)
return -ENODEV;
if (!rb || !rb->access->read_first_n)
return -EINVAL;
- return rb->access->read_first_n(rb, n, buf);
+
+ do {
+ if (!iio_buffer_data_available(rb)) {
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ ret = wait_event_interruptible(rb->pollq,
+ iio_buffer_data_available(rb) ||
+ indio_dev->info == NULL);
+ if (ret)
+ return ret;
+ if (indio_dev->info == NULL)
+ return -ENODEV;
+ }
+
+ ret = rb->access->read_first_n(rb, n, buf);
+ if (ret == 0 && (filp->f_flags & O_NONBLOCK))
+ ret = -EAGAIN;
+ } while (ret == 0);
+
+ return ret;
}
/**