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.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dummy/iio_simple_dummy_buffer.c b/drivers/iio/dummy/iio_simple_dummy_buffer.c
index 5512d5e..59aa60d 100644 (file)
--- a/drivers/iio/dummy/iio_simple_dummy_buffer.c
+++ b/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 @@ error_ret:
  */
 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);
 }