From d024af5b3970b9a9e7ae01629edf2e36827462e4 Mon Sep 17 00:00:00 2001 From: Jagath Jog J Date: Thu, 5 May 2022 19:00:17 +0530 Subject: [PATCH] iio: accel: bma400: Add step change event Added support for event when there is a detection of step change. INT1 pin is used to interrupt and event is pushed to userspace. Signed-off-by: Jagath Jog J Link: https://lore.kernel.org/r/20220505133021.22362-7-jagathjog1996@gmail.com Signed-off-by: Jonathan Cameron --- drivers/iio/accel/bma400.h | 2 + drivers/iio/accel/bma400_core.c | 76 +++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index 32c08f8b0b98..0faa40fdbbf8 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 @@ -55,6 +56,7 @@ #define BMA400_STEP_STAT_REG 0x18 #define BMA400_STEP_INT_MSK BIT(0) #define BMA400_STEP_RAW_LEN 0x03 +#define BMA400_STEP_STAT_MASK GENMASK(9, 8) /* * Read-write configuration registers diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c index d9402c6b8788..8483c6658436 100644 --- a/drivers/iio/accel/bma400_core.c +++ b/drivers/iio/accel/bma400_core.c @@ -25,6 +25,7 @@ #include #include +#include #include #include #include @@ -78,6 +79,7 @@ struct bma400_data { int scale; struct iio_trigger *trig; int steps_enabled; + bool step_event_en; /* Correct time stamp alignment */ struct { __le16 buff[3]; @@ -176,6 +178,12 @@ 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, \ @@ -218,6 +226,8 @@ 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), }; @@ -907,6 +917,58 @@ 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: + return data->step_event_en; + default: + return -EINVAL; + } +} + +static int bma400_steps_event_enable(struct bma400_data *data, int state) +{ + int ret; + + ret = bma400_enable_steps(data, 1); + if (ret) + return ret; + + ret = regmap_update_bits(data->regmap, BMA400_INT12_MAP_REG, + BMA400_STEP_INT_MSK, + FIELD_PREP(BMA400_STEP_INT_MSK, + state)); + if (ret) + return ret; + data->step_event_en = state; + 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) +{ + struct bma400_data *data = iio_priv(indio_dev); + int ret; + + switch (chan->type) { + case IIO_STEPS: + mutex_lock(&data->mutex); + ret = bma400_steps_event_enable(data, state); + mutex_unlock(&data->mutex); + return ret; + default: + return -EINVAL; + } +} + static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { @@ -937,6 +999,8 @@ 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 = { @@ -984,6 +1048,7 @@ 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); int ret; /* Lock to protect the data->status */ @@ -998,12 +1063,23 @@ static irqreturn_t bma400_interrupt(int irq, void *private) if (ret || !data->status) goto unlock_err; + if (FIELD_GET(BMA400_STEP_STAT_MASK, le16_to_cpu(data->status))) { + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD, + IIO_EV_TYPE_CHANGE, + IIO_EV_DIR_NONE), + timestamp); + } + if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) { mutex_unlock(&data->mutex); iio_trigger_poll_chained(data->trig); return IRQ_HANDLED; } + mutex_unlock(&data->mutex); + return IRQ_HANDLED; + unlock_err: mutex_unlock(&data->mutex); return IRQ_NONE;