> Add event channels that controls the creation of motion events.
>
> Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
> ---
> Changes since v1:
> * added handling of LSM6
> * added CHANNEL info with events for ACC
> * removed st_lsm6dsx_set_event_threshold function
> * added check of event type to event channels
>
> Changes since v2:
> * added devices specific registers to st_lsm6dsx_sensor_settings
> * allow to write threshold when the events are disabled
>
> How do we use the existing macro's when I want to expand them with
> events for the accelerometer only?
>
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 43 +++++
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 156 +++++++++++++++++--
> 2 files changed, 190 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> index 5e3cd96b0059..10f3191e8695 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> @@ -12,6 +12,7 @@
> #define ST_LSM6DSX_H
>
> #include <linux/device.h>
> +#include <linux/iio/iio.h>
>
> #define ST_LSM6DS3_DEV_NAME "lsm6ds3"
> #define ST_LSM6DS3H_DEV_NAME "lsm6ds3h"
> @@ -54,6 +55,26 @@ enum st_lsm6dsx_hw_id {
> * ST_LSM6DSX_TAGGED_SAMPLE_SIZE)
> #define ST_LSM6DSX_SHIFT_VAL(val, mask) (((val) << __ffs(mask)) & (mask))
>
> +#define ST_LSM6DSX_CHANNEL_ACC(chan_type, addr, mod, scan_idx) \
> +{ \
> + .type = chan_type, \
> + .address = addr, \
> + .modified = 1, \
> + .channel2 = mod, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
This patch is based on a old driver version:
commit 48cceecfa7625e700ed9c57392bd17923c4832c0
iio: imu: st_lsm6dsx: make IIO_CHAN_INFO_SCALE shared by type
> + .scan_index = scan_idx, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 16, \
> + .storagebits = 16, \
> + .endianness = IIO_LE, \
> + }, \
> + .event_spec = &st_lsm6dsx_event, \
> + .num_event_specs = 1, \
> +}
> +
> #define ST_LSM6DSX_CHANNEL(chan_type, addr, mod, scan_idx) \
I guess you can rename ST_LSM6DSX_CHANNEL in ST_LSM6DSX_CHANNEL_GYRO now
> { \
> .type = chan_type, \
> @@ -162,6 +183,13 @@ struct st_lsm6dsx_shub_settings {
> u8 batch_en;
> };
>
> +struct st_lsm6dsx_event_settings {
> + u8 enable_addr;
> + u8 enable_mask;
> + u8 wakeup_addr;
> + u8 wakeup_thres_mask;
you can rely on struct st_lsm6dsx_reg for them
> +};
> +
> enum st_lsm6dsx_ext_sensor_id {
> ST_LSM6DSX_ID_MAGN,
> };
> @@ -223,6 +251,9 @@ struct st_lsm6dsx_settings {
> u8 wai;
> u8 int1_addr;
> u8 int2_addr;
> + u8 int1_func_addr;
> + u8 int2_func_addr;
> + u8 int_func_mask;
> u8 reset_addr;
> u16 max_fifo_size;
> struct {
> @@ -240,6 +271,7 @@ struct st_lsm6dsx_settings {
> struct st_lsm6dsx_fifo_ops fifo_ops;
> struct st_lsm6dsx_hw_ts_settings ts_settings;
> struct st_lsm6dsx_shub_settings shub_settings;
> + struct st_lsm6dsx_event_settings event_settings;
> };
>
> enum st_lsm6dsx_sensor_id {
> @@ -320,6 +352,10 @@ struct st_lsm6dsx_hw {
> u8 ts_sip;
> u8 sip;
>
> + u8 event_threshold;
> + bool enable_event;
> + struct st_lsm6dsx_reg irq_routing;
> +
> u8 *buff;
>
> struct iio_dev *iio_devs[ST_LSM6DSX_ID_MAX];
> @@ -327,6 +363,13 @@ struct st_lsm6dsx_hw {
> const struct st_lsm6dsx_settings *settings;
> };
>
> +static const struct iio_event_spec st_lsm6dsx_event = {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_EITHER,
> + .mask_separate = BIT(IIO_EV_INFO_VALUE) |
> + BIT(IIO_EV_INFO_ENABLE)
> +};
> +
> static const unsigned long st_lsm6dsx_available_scan_masks[] = {0x7, 0x0};
> extern const struct dev_pm_ops st_lsm6dsx_pm_ops;
>
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 8e0da5eb4283..d4d6ba934b6d 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -73,9 +73,9 @@
> #define ST_LSM6DSX_REG_PP_OD_MASK BIT(4)
>
> static const struct iio_chan_spec st_lsm6dsx_acc_channels[] = {
> - ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x28, IIO_MOD_X, 0),
> - ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x2a, IIO_MOD_Y, 1),
> - ST_LSM6DSX_CHANNEL(IIO_ACCEL, 0x2c, IIO_MOD_Z, 2),
> + ST_LSM6DSX_CHANNEL_ACC(IIO_ACCEL, 0x28, IIO_MOD_X, 0),
> + ST_LSM6DSX_CHANNEL_ACC(IIO_ACCEL, 0x2a, IIO_MOD_Y, 1),
> + ST_LSM6DSX_CHANNEL_ACC(IIO_ACCEL, 0x2c, IIO_MOD_Z, 2),
> IIO_CHAN_SOFT_TIMESTAMP(3),
> };
>
> @@ -392,6 +392,9 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> .wai = 0x6a,
> .int1_addr = 0x0d,
> .int2_addr = 0x0e,
> + .int1_func_addr = 0x5e,
> + .int2_func_addr = 0x5f,
> + .int_func_mask = BIT(5),
> .reset_addr = 0x12,
> .max_fifo_size = 682,
> .id = {
> @@ -508,6 +511,12 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> .mask = GENMASK(5, 3),
> },
> },
> + .event_settings = {
> + .enable_addr = 0x58,
> + .enable_mask = BIT(7),
> + .wakeup_addr = 0x5B,
> + .wakeup_thres_mask = GENMASK(5, 0),
> + },
> },
> {
> .wai = 0x6c,
> @@ -1072,18 +1081,21 @@ static int st_lsm6dsx_read_oneshot(struct st_lsm6dsx_sensor *sensor,
> int err, delay;
> __le16 data;
>
> - err = st_lsm6dsx_sensor_set_enable(sensor, true);
> - if (err < 0)
> - return err;
> + if (!hw->enable_event) {
> + err = st_lsm6dsx_sensor_set_enable(sensor, true);
> + if (err < 0)
> + return err;
>
> - delay = 1000000 / sensor->odr;
> - usleep_range(delay, 2 * delay);
> + delay = 1000000 / sensor->odr;
> + usleep_range(delay, 2 * delay);
> + }
>
> err = st_lsm6dsx_read_locked(hw, addr, &data, sizeof(data));
> if (err < 0)
> return err;
>
> - st_lsm6dsx_sensor_set_enable(sensor, false);
> + if (!hw->enable_event)
> + st_lsm6dsx_sensor_set_enable(sensor, false);
>
> *val = (s16)le16_to_cpu(data);
>
> @@ -1156,6 +1168,124 @@ static int st_lsm6dsx_write_raw(struct iio_dev *iio_dev,
> return err;
> }
>
> +int st_lsm6dsx_event_setup(struct st_lsm6dsx_hw *hw, int state)
> +{
> + int err;
> + u8 enable = 0;
> +
> + if (state)
> + enable = hw->settings->event_settings.enable_mask;
enable = state ? hw->settings->event_settings.enable_mask : 0
> +
> + err = regmap_update_bits(hw->regmap,
> + hw->settings->event_settings.enable_addr,
> + hw->settings->event_settings.enable_mask,
> + enable);
> + if (err < 0)
> + return err;
> +
> + enable = 0;
> + if (state)
> + enable = hw->irq_routing.mask;
this is pretty ugly, why not doing:
enable = state ? hw->irq_routing.mask : 0
> +
> + /* Enable wakeup interrupt */
> + err = regmap_update_bits(hw->regmap, hw->irq_routing.addr,
> + hw->irq_routing.mask,
> + enable);
> +
> + return err;
> +}
> +
> +static int st_lsm6dsx_read_event(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + enum iio_event_info info,
> + int *val, int *val2)
> +{
> + struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> + struct st_lsm6dsx_hw *hw = sensor->hw;
> +
> + if (type != IIO_EV_TYPE_THRESH)
> + return -EINVAL;
> +
> + *val2 = 0;
> + *val = hw->event_threshold;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static int st_lsm6dsx_write_event(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + enum iio_event_info info,
> + int val, int val2)
> +{
> + struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> + struct st_lsm6dsx_hw *hw = sensor->hw;
> + int err;
> +
> + if (type != IIO_EV_TYPE_THRESH)
> + return -EINVAL;
> +
> + if (val < 0 || val > 31)
> + return -EINVAL;
> +
> + err = regmap_update_bits(hw->regmap,
> + hw->settings->event_settings.wakeup_addr,
> + hw->settings->event_settings.wakeup_thres_mask,
> + val);
> + if (err)
> + return -EINVAL;
> +
> + hw->event_threshold = val;
> +
> + return 0;
> +}
> +
> +static int st_lsm6dsx_read_event_config(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir)
> +{
> + struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> + struct st_lsm6dsx_hw *hw = sensor->hw;
> +
> + if (type != IIO_EV_TYPE_THRESH)
> + return -EINVAL;
> +
> + return hw->enable_event;
> +}
> +
> +static int st_lsm6dsx_write_event_config(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + int state)
> +{
> + struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> + struct st_lsm6dsx_hw *hw = sensor->hw;
> + int err = 0;
> +
> + if (type != IIO_EV_TYPE_THRESH)
> + return -EINVAL;
> +
> + if (state && hw->enable_event)
> + return 0;
> +
> + err = st_lsm6dsx_event_setup(hw, state);
> + if (err < 0)
> + return err;
> +
> + err = st_lsm6dsx_sensor_set_enable(sensor, state);
> + if (err < 0)
> + return err;
> +
> + hw->enable_event = state;
> +
> + return 0;
> +}
> +
> int st_lsm6dsx_set_watermark(struct iio_dev *iio_dev, unsigned int val)
> {
> struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> @@ -1240,6 +1370,10 @@ static const struct iio_info st_lsm6dsx_acc_info = {
> .attrs = &st_lsm6dsx_acc_attribute_group,
> .read_raw = st_lsm6dsx_read_raw,
> .write_raw = st_lsm6dsx_write_raw,
> + .read_event_value = st_lsm6dsx_read_event,
> + .write_event_value = st_lsm6dsx_write_event,
> + .read_event_config = st_lsm6dsx_read_event_config,
> + .write_event_config = st_lsm6dsx_write_event_config,
> .hwfifo_set_watermark = st_lsm6dsx_set_watermark,
> };
>
> @@ -1285,9 +1419,13 @@ static int st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw, u8 *drdy_reg)
> switch (drdy_pin) {
> case 1:
> *drdy_reg = hw->settings->int1_addr;
> + hw->irq_routing.addr = hw->settings->int1_func_addr;
> + hw->irq_routing.mask = hw->settings->int_func_mask;
> break;
> case 2:
> *drdy_reg = hw->settings->int2_addr;
> + hw->irq_routing.addr = hw->settings->int2_func_addr;
> + hw->irq_routing.mask = hw->settings->int_func_mask;
> break;
> default:
> dev_err(hw->dev, "unsupported data ready pin\n");
> --
> 2.23.0
>
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