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Date: Sat, 19 Mar 2022 23:40:23 +0530
From: Jagath Jog J <jagathjog1996@...il.com>
To: dan@...obertson.com, jic23@...nel.org, andy.shevchenko@...il.com
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 5/5] iio: accel: bma400: Add step change event
Added support for event when there is a detection of single step
or double step change. INT1 pin is used to interrupt and event
is pushed to userspace.
Signed-off-by: Jagath Jog J <jagathjog1996@...il.com>
---
drivers/iio/accel/bma400.h | 2 +
drivers/iio/accel/bma400_core.c | 72 +++++++++++++++++++++++++++++++++
2 files changed, 74 insertions(+)
diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h
index 65bbc80cbb7f..c833119bb42e 100644
--- a/drivers/iio/accel/bma400.h
+++ b/drivers/iio/accel/bma400.h
@@ -39,6 +39,7 @@
#define BMA400_INT_STAT0_REG 0x0e
#define BMA400_INT_STAT1_REG 0x0f
#define BMA400_INT_STAT2_REG 0x10
+#define BMA400_INT12_MAP_REG 0x23
/* Temperature register */
#define BMA400_TEMP_DATA_REG 0x11
@@ -54,6 +55,7 @@
#define BMA400_STEP_CNT3_REG 0x17
#define BMA400_STEP_STAT_REG 0x18
#define BMA400_STEP_INT_MSK BIT(0)
+#define BMA400_STEP_STAT_MASK GENMASK(1, 0)
/*
* Read-write configuration registers
diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c
index 305643e99eb5..79321e41df51 100644
--- a/drivers/iio/accel/bma400_core.c
+++ b/drivers/iio/accel/bma400_core.c
@@ -26,6 +26,7 @@
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/events.h>
#include "bma400.h"
@@ -69,6 +70,7 @@ struct bma400_data {
int scale;
struct iio_trigger *trig;
int steps_enabled;
+ bool step_event_en;
/* Correct time stamp alignment */
struct {
__be16 buff[3];
@@ -166,6 +168,12 @@ static const struct iio_chan_spec_ext_info bma400_ext_info[] = {
{ }
};
+static const struct iio_event_spec bma400_step_detect_event = {
+ .type = IIO_EV_TYPE_CHANGE,
+ .dir = IIO_EV_DIR_NONE,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+};
+
#define BMA400_ACC_CHANNEL(_index, _axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
@@ -208,6 +216,8 @@ static const struct iio_chan_spec bma400_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
BIT(IIO_CHAN_INFO_ENABLE),
.scan_index = -1, /* No buffer support */
+ .event_spec = &bma400_step_detect_event,
+ .num_event_specs = 1,
},
IIO_CHAN_SOFT_TIMESTAMP(4),
@@ -858,6 +868,59 @@ static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev,
}
}
+static int bma400_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct bma400_data *data = iio_priv(indio_dev);
+
+ switch (chan->type) {
+ case IIO_STEPS:
+ switch (type) {
+ case IIO_EV_TYPE_CHANGE:
+ return data->steps_enabled;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int bma400_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ int ret;
+ struct bma400_data *data = iio_priv(indio_dev);
+
+ switch (chan->type) {
+ case IIO_STEPS:
+ switch (type) {
+ case IIO_EV_TYPE_CHANGE:
+ mutex_lock(&data->mutex);
+ ret = regmap_update_bits(data->regmap,
+ BMA400_INT12_MAP_REG,
+ BMA400_STEP_INT_MSK,
+ FIELD_PREP(BMA400_STEP_INT_MSK,
+ state));
+ mutex_unlock(&data->mutex);
+ if (ret)
+ return ret;
+ data->steps_enabled = state;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
@@ -890,6 +953,8 @@ static const struct iio_info bma400_info = {
.read_avail = bma400_read_avail,
.write_raw = bma400_write_raw,
.write_raw_get_fmt = bma400_write_raw_get_fmt,
+ .read_event_config = bma400_read_event_config,
+ .write_event_config = bma400_write_event_config,
};
static const struct iio_trigger_ops bma400_trigger_ops = {
@@ -945,6 +1010,13 @@ static irqreturn_t bma400_interrupt(int irq, void *private)
if (status & BMA400_INT_DRDY_MSK)
iio_trigger_poll_chained(data->trig);
+ if (status & (BMA400_STEP_STAT_MASK << 8)) {
+ iio_push_event(indio_dev,
+ IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
+ IIO_EV_DIR_NONE,
+ IIO_EV_TYPE_CHANGE, 0, 0, 0),
+ iio_get_time_ns(indio_dev));
+ }
out:
return IRQ_HANDLED;
}
--
2.17.1
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