From 00ee658ff58177fccfc4d80e611f31884f8a16c4 Mon Sep 17 00:00:00 2001 From: Jagath Jog J Date: Thu, 5 May 2022 19:00:18 +0530 Subject: [PATCH] iio: accel: bma400: Add activity recognition support 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 Link: https://lore.kernel.org/r/20220505133021.22362-8-jagathjog1996@gmail.com Signed-off-by: Jonathan Cameron --- drivers/iio/accel/bma400_core.c | 85 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c index 8483c66..e977326 100644 --- a/drivers/iio/accel/bma400_core.c +++ b/drivers/iio/accel/bma400_core.c @@ -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))) { -- 2.7.4