1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/iio/gyro/st_gyro_buffer.c b/drivers/iio/gyro/st_gyro_buffer.c
new file mode 100644
index 000000000..4feb7ada7
--- /dev/null
+++ b/drivers/iio/gyro/st_gyro_buffer.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics gyroscopes driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include <linux/iio/common/st_sensors.h>
+#include "st_gyro.h"
+
+int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+
+	return st_sensors_set_dataready_irq(indio_dev, state);
+}
+
+static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
+{
+	int err;
+
+	err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]);
+	if (err < 0)
+		return err;
+
+	err = st_sensors_set_enable(indio_dev, true);
+	if (err < 0)
+		goto st_gyro_buffer_enable_all_axis;
+
+	return 0;
+
+st_gyro_buffer_enable_all_axis:
+	st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+	return err;
+}
+
+static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
+{
+	int err;
+
+	err = st_sensors_set_enable(indio_dev, false);
+	if (err < 0)
+		return err;
+
+	return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+}
+
+static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
+	.postenable = &st_gyro_buffer_postenable,
+	.predisable = &st_gyro_buffer_predisable,
+};
+
+int st_gyro_allocate_ring(struct iio_dev *indio_dev)
+{
+	return iio_triggered_buffer_setup(indio_dev, NULL,
+		&st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
+}
+
+void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
+{
+	iio_triggered_buffer_cleanup(indio_dev);
+}
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
+MODULE_LICENSE("GPL v2");