Add support for activity recognition like STILL, WALKING, RUNNING
and these events are pushed to the userspace whenever the STEP
interrupt occurs.
Signed-off-by: Jagath Jog J <jagathjog1996@xxxxxxxxx>
---
drivers/iio/accel/bma400_core.c | 86 +++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c
index fe101df7b773..073fff7d64a3 100644
--- a/drivers/iio/accel/bma400_core.c
+++ b/drivers/iio/accel/bma400_core.c
@@ -60,6 +60,12 @@ struct bma400_sample_freq {
int uhz;
};
+enum bma400_activity {
+ BMA400_STILL,
+ BMA400_WALKING,
+ BMA400_RUNNING,
+};
+
struct bma400_data {
struct device *dev;
struct regmap *regmap;
@@ -73,6 +79,7 @@ struct bma400_data {
struct iio_trigger *trig;
int steps_enabled;
bool step_event_en;
+ bool activity_event_en;
/* Correct time stamp alignment */
struct {
__le16 buff[3];
@@ -177,6 +184,12 @@ static const struct iio_event_spec bma400_step_detect_event = {
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
};
+static const struct iio_event_spec bma400_activity_event = {
+ .type = IIO_EV_TYPE_CHANGE,
+ .dir = IIO_EV_DIR_NONE,
+ .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE),
+};
+
#define BMA400_ACC_CHANNEL(_index, _axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
@@ -198,6 +211,16 @@ static const struct iio_event_spec bma400_step_detect_event = {
}, \
}
+#define BMA400_ACTIVITY_CHANNEL(_chan2) { \
+ .type = IIO_ACTIVITY, \
+ .modified = 1, \
+ .channel2 = _chan2, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .scan_index = -1, /* No buffer support */ \
+ .event_spec = &bma400_activity_event, \
+ .num_event_specs = 1, \
+}
+
static const struct iio_chan_spec bma400_channels[] = {
BMA400_ACC_CHANNEL(0, X),
BMA400_ACC_CHANNEL(1, Y),
@@ -222,6 +245,9 @@ static const struct iio_chan_spec bma400_channels[] = {
.event_spec = &bma400_step_detect_event,
.num_event_specs = 1,
},
+ BMA400_ACTIVITY_CHANNEL(IIO_MOD_STILL),
+ BMA400_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
+ BMA400_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
IIO_CHAN_SOFT_TIMESTAMP(4),
};
@@ -660,6 +686,20 @@ static void bma400_power_disable(void *data_ptr)
ERR_PTR(ret));
}
+static enum iio_modifier bma400_act_to_mod(enum bma400_activity activity)
+{
+ switch (activity) {
+ case BMA400_STILL:
+ return IIO_MOD_STILL;
+ case BMA400_WALKING:
+ return IIO_MOD_WALKING;
+ case BMA400_RUNNING:
+ return IIO_MOD_RUNNING;
+ default:
+ return IIO_NO_MOD;
+ }
+}
+
static int bma400_init(struct bma400_data *data)
{
unsigned int val;
@@ -758,6 +798,7 @@ static int bma400_read_raw(struct iio_dev *indio_dev,
{
struct bma400_data *data = iio_priv(indio_dev);
int ret;
+ unsigned int activity;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
@@ -769,6 +810,21 @@ static int bma400_read_raw(struct iio_dev *indio_dev,
return ret;
case IIO_STEPS:
return bma400_get_steps_reg(data, val);
+ case IIO_ACTIVITY:
+ ret = regmap_read(data->regmap, BMA400_STEP_STAT_REG,
+ &activity);
+ if (ret)
+ return ret;
+ /*
+ * The device does not support confidence value levels,
+ * so we will always have 100% for current activity and
+ * 0% for the others.
+ */
+ if (chan->channel2 == bma400_act_to_mod(activity))
+ *val = 100;
+ else
+ *val = 0;
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -918,6 +974,8 @@ static int bma400_read_event_config(struct iio_dev *indio_dev,
switch (chan->type) {
case IIO_STEPS:
return data->step_event_en;
+ case IIO_ACTIVITY:
+ return data->activity_event_en;
default:
return -EINVAL;
}
@@ -955,6 +1013,18 @@ static int bma400_write_event_config(struct iio_dev *indio_dev,
ret = bma400_steps_event_enable(data, state);
mutex_unlock(&data->mutex);
return ret;
+ case IIO_ACTIVITY:
+ mutex_lock(&data->mutex);
+ if (!data->step_event_en) {
+ ret = bma400_steps_event_enable(data, true);
+ if (ret) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ }
+ data->activity_event_en = state;
+ mutex_unlock(&data->mutex);
+ return 0;
default:
return -EINVAL;
}
@@ -1037,6 +1107,7 @@ static irqreturn_t bma400_interrupt(int irq, void *private)
struct bma400_data *data = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
int ret;
+ unsigned int act;
/* Lock to protect the data->status */
mutex_lock(&data->mutex);
@@ -1052,6 +1123,21 @@ static irqreturn_t bma400_interrupt(int irq, void *private)
IIO_EV_DIR_NONE,
IIO_EV_TYPE_CHANGE, 0, 0, 0),
timestamp);
+
+ if (data->activity_event_en) {
+ ret = regmap_read(data->regmap, BMA400_STEP_STAT_REG,
+ &act);
+ if (ret)
+ goto unlock_err;
+
+ iio_push_event(indio_dev,
+ IIO_EVENT_CODE(IIO_ACTIVITY, 0,
+ bma400_act_to_mod(act),
+ IIO_EV_DIR_NONE,
+ IIO_EV_TYPE_CHANGE, 0,
+ 0, 0),
+ timestamp);
+ }
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
--
2.17.1
