This patch is introducing preenable/postdisable in the common
st_sensors_buffer code in order to remove the memory allocation /
de-allocation from each single st driver.
Signed-off-by: Denis Ciocca <denis.ciocca@xxxxxx>
---
.../iio/common/st_sensors/st_sensors_buffer.c | 22 +++++++++++++++++++
include/linux/iio/common/st_sensors.h | 2 ++
2 files changed, 24 insertions(+)
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c
index eee30130ae23..9da1c8104883 100644
--- a/drivers/iio/common/st_sensors/st_sensors_buffer.c
+++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -81,6 +81,28 @@ irqreturn_t st_sensors_trigger_handler(int irq, void *p)
}
EXPORT_SYMBOL(st_sensors_trigger_handler);
+int st_sensors_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ sdata->buffer_data = kmalloc(indio_dev->scan_bytes,
+ GFP_DMA | GFP_KERNEL);
+ if (!sdata->buffer_data)
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL(st_sensors_buffer_preenable);
+
+int st_sensors_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ kfree(sdata->buffer_data);
+ return 0;
+}
+EXPORT_SYMBOL(st_sensors_buffer_postdisable);
+
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
MODULE_LICENSE("GPL v2");
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
index 28fc1f9fa7d5..c66ebb236a15 100644
--- a/include/linux/iio/common/st_sensors.h
+++ b/include/linux/iio/common/st_sensors.h
@@ -254,6 +254,8 @@ struct st_sensor_data {
#ifdef CONFIG_IIO_BUFFER
irqreturn_t st_sensors_trigger_handler(int irq, void *p);
+int st_sensors_buffer_preenable(struct iio_dev *indio_dev);
+int st_sensors_buffer_postdisable(struct iio_dev *indio_dev);
#endif
#ifdef CONFIG_IIO_TRIGGER
--
2.22.0
