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iio: accel: bma400: Add activity recognition support

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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@gmail.com>
Link: https://lore.kernel.org/r/20220505133021.22362-8-jagathjog1996@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jagath Jog J 2022-05-05 19:00:18 +05:30 committed by Jonathan Cameron
parent d024af5b39
commit 00ee658ff5
1 changed files with 85 additions and 0 deletions
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85
drivers/iio/accel/bma400_core.c
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@ -67,6 +67,12 @@ struct bma400_sample_freq {
int uhz;
};
enum bma400_activity {
BMA400_STILL,
BMA400_WALKING,
BMA400_RUNNING,
};
struct bma400_data {
struct device *dev;
struct regmap *regmap;
@ -80,6 +86,7 @@ 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];
@ -184,6 +191,12 @@ 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, \
@ -205,6 +218,16 @@ 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),
@ -229,6 +252,9 @@ 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),
};
@ -669,6 +695,20 @@ 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;
@ -766,6 +806,7 @@ static int bma400_read_raw(struct iio_dev *indio_dev,
int *val2, long mask)
{
struct bma400_data *data = iio_priv(indio_dev);
unsigned int activity;
int ret;
switch (mask) {
@ -778,6 +819,21 @@ 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;
}
@ -927,6 +983,8 @@ 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;
}
@ -964,6 +1022,18 @@ 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;
}
@ -1049,6 +1119,7 @@ static irqreturn_t bma400_interrupt(int irq, void *private)
struct iio_dev *indio_dev = private;
struct bma400_data *data = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
unsigned int act;
int ret;
/* Lock to protect the data->status */
@ -1069,6 +1140,20 @@ static irqreturn_t bma400_interrupt(int irq, void *private)
IIO_EV_TYPE_CHANGE,
IIO_EV_DIR_NONE),
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_MOD_EVENT_CODE(IIO_ACTIVITY, 0,
bma400_act_to_mod(act),
IIO_EV_TYPE_CHANGE,
IIO_EV_DIR_NONE),
timestamp);
}
}
if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) {