iio: dummy: iio_simple_dummy_buffer: use triggered buffer core calls

The iio_simple_dummy_configure_buffer() function is essentially a
re-implementation of the iio_triggered_buffer_setup() function.

This change makes use of the iio_triggered_buffer_setup() function. The
reason is so that we don't have to modify the iio_device_attach_buffer()
function in this driver as well.

One minor drawback is that the pollfunc name may not be 100% identical
with the one in the original code, but since it's an example, it should be
a big problem.

This change does a minor re-arranging of the included iio headers, as a
minor tidy-up.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-19-alexandru.ardelean@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dummy/iio_simple_dummy_buffer.c

@@ -16,9 +16,9 @@
 #include <linux/bitmap.h>
 
 #include <linux/iio/iio.h>
-#include <linux/iio/trigger_consumer.h>
 #include <linux/iio/buffer.h>
-#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
 
 #include "iio_simple_dummy.h"
 
@@ -103,64 +103,9 @@ static const struct iio_buffer_setup_ops iio_simple_dummy_buffer_setup_ops = {
 
 int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev)
 {
-	int ret;
-	struct iio_buffer *buffer;
-
-	/* Allocate a buffer to use - here a kfifo */
-	buffer = iio_kfifo_allocate();
-	if (!buffer) {
-		ret = -ENOMEM;
-		goto error_ret;
-	}
-
-	iio_device_attach_buffer(indio_dev, buffer);
-
-	/*
-	 * Tell the core what device type specific functions should
-	 * be run on either side of buffer capture enable / disable.
-	 */
-	indio_dev->setup_ops = &iio_simple_dummy_buffer_setup_ops;
-
-	/*
-	 * Configure a polling function.
-	 * When a trigger event with this polling function connected
-	 * occurs, this function is run. Typically this grabs data
-	 * from the device.
-	 *
-	 * NULL for the bottom half. This is normally implemented only if we
-	 * either want to ping a capture now pin (no sleeping) or grab
-	 * a timestamp as close as possible to a data ready trigger firing.
-	 *
-	 * IRQF_ONESHOT ensures irqs are masked such that only one instance
-	 * of the handler can run at a time.
-	 *
-	 * "iio_simple_dummy_consumer%d" formatting string for the irq 'name'
-	 * as seen under /proc/interrupts. Remaining parameters as per printk.
-	 */
-	indio_dev->pollfunc = iio_alloc_pollfunc(NULL,
-						 &iio_simple_dummy_trigger_h,
-						 IRQF_ONESHOT,
-						 indio_dev,
-						 "iio_simple_dummy_consumer%d",
-						 indio_dev->id);
-
-	if (!indio_dev->pollfunc) {
-		ret = -ENOMEM;
-		goto error_free_buffer;
-	}
-
-	/*
-	 * Notify the core that this device is capable of buffered capture
-	 * driven by a trigger.
-	 */
-	indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
-
-	return 0;
-
-error_free_buffer:
-	iio_kfifo_free(indio_dev->buffer);
-error_ret:
-	return ret;
+	return iio_triggered_buffer_setup(indio_dev, NULL,
+					  iio_simple_dummy_trigger_h,
+					  &iio_simple_dummy_buffer_setup_ops);
 }
 
 /**
@@ -169,6 +114,5 @@ int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev)
  */
 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev)
 {
-	iio_dealloc_pollfunc(indio_dev->pollfunc);
-	iio_kfifo_free(indio_dev->buffer);
+	iio_triggered_buffer_cleanup(indio_dev);
 }