Add trigger options to the sensor driver. Reacting to the sensor events
communicated by IRQ, the FIFO handling and the trigger will be core
events for further feature implementation.
Signed-off-by: Lothar Rubusch <l.rubusch@xxxxxxxxx>
---
drivers/iio/accel/adxl345_core.c | 34 ++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index ece28825fb..b917b02245 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -15,6 +15,9 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
+#include <linux/iio/kfifo_buf.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
@@ -140,11 +143,13 @@ struct adxl34x_state {
const struct adxl345_chip_info *info;
struct regmap *regmap;
struct adxl34x_platform_data data; /* watermark, fifo_mode, etc */
+ struct iio_trigger *trig_dready;
__le16 fifo_buf[3 * ADXL34x_FIFO_SIZE] __aligned(IIO_DMA_MINALIGN);
u8 int_map;
bool fifo_delay; /* delay: delay is needed for SPI */
u8 intio;
+ bool watermark_en;
};
#define ADXL34x_CHANNEL(index, reg, axis) { \
@@ -415,6 +420,35 @@ static int adxl345_get_status(struct adxl34x_state *st, u8 *int_stat)
return 0;
}
+/* data ready trigger */
+
+static int adxl345_trig_dready(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct adxl34x_state *st = iio_priv(indio_dev);
+
+ st->int_map = 0x00;
+ if (state) {
+ /* Setting also ADXL345_INT_DATA_READY results in just a single
+ * generated interrupt, and no continuously re-generation. NB that the
+ * INT_DATA_READY as well as the INT_OVERRUN are managed automatically,
+ * setting their bits here is not needed.
+ */
+ if (st->watermark_en)
+ st->int_map |= ADXL345_INT_WATERMARK;
+
+ pr_debug("%s(): preparing st->int_map 0x%02X\n",
+ __func__, st->int_map);
+ }
+
+ return 0;
+}
+
+static const struct iio_trigger_ops adxl34x_trig_dready_ops = {
+ .validate_device = &iio_trigger_validate_own_device,
+ .set_trigger_state = adxl345_trig_dready,
+};
+
/**
* Interrupt handler used for several features of the ADXL345.
* - DATA_READY / FIFO watermark
--
2.39.2
