> Allow the debouce counter for transient events to be configured
> using the sysfs attribute events/in_accel_thresh_rising_period
comments inline
> Signed-off-by: Martin Fuzzey <mfuzzey@xxxxxxxxxxx>
> ---
> drivers/iio/accel/mma8452.c | 75 ++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 73 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> index 8129c0b..7e0c29c 100644
> --- a/drivers/iio/accel/mma8452.c
> +++ b/drivers/iio/accel/mma8452.c
> @@ -129,6 +129,12 @@ static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n,
> return -EINVAL;
> }
>
> +static int mma8452_get_odr_index(struct mma8452_data *data)
> +{
> + return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
> + MMA8452_CTRL_DR_SHIFT;
> +}
> +
> static const int mma8452_samp_freq[8][2] = {
> {800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000},
> {6, 250000}, {1, 560000}
> @@ -144,6 +150,18 @@ static const int mma8452_scales[3][2] = {
> {0, 9577}, {0, 19154}, {0, 38307}
> };
>
> +/* Datasheet table 35 (step time vs sample frequency) */
> +static const int mma8452_transient_time_step_us[8] = {
> + 1250,
> + 2500,
> + 5000,
> + 10000,
> + 20000,
> + 20000,
> + 20000,
> + 20000
> +};
> +
> static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> @@ -203,8 +221,7 @@ static int mma8452_read_raw(struct iio_dev *indio_dev,
> *val2 = mma8452_scales[i][1];
> return IIO_VAL_INT_PLUS_MICRO;
> case IIO_CHAN_INFO_SAMP_FREQ:
> - i = (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
> - MMA8452_CTRL_DR_SHIFT;
> + i = mma8452_get_odr_index(data);
> *val = mma8452_samp_freq[i][0];
> *val2 = mma8452_samp_freq[i][1];
> return IIO_VAL_INT_PLUS_MICRO;
> @@ -356,6 +373,52 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
> return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, val);
> }
>
> +static ssize_t mma8452_query_transient_period(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct mma8452_data *data = iio_priv(indio_dev);
> + int us, steps;
> +
> + steps = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_COUNT);
> + if (steps < 0)
> + return steps;
> +
> + us = mma8452_transient_time_step_us[mma8452_get_odr_index(data)]
> + * steps;
> +
> + return sprintf(buf, "%ld.%06ld\n",
> + us / USEC_PER_SEC, us % USEC_PER_SEC);
> +}
> +
> +static ssize_t mma8452_set_transient_period(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct mma8452_data *data = iio_priv(indio_dev);
> + int i, f, us, steps, ret;
> +
> + ret = iio_str_to_fixpoint(buf, USEC_PER_SEC / 10, &i, &f);
> + if (ret)
> + return ret;
> +
> + us = i * USEC_PER_SEC + f;
> + steps = us / mma8452_transient_time_step_us[
> + mma8452_get_odr_index(data)];
> +
> + if (steps < 0 || steps > 0xFF)
perhaps do the check for negative i earlier; use lowercase hex-values
> + return -EINVAL;
> +
> + ret = mma8452_change_config(data, MMA8452_TRANSIENT_COUNT, steps);
> + if (ret)
> + return ret;
> +
> + return len;
> +}
> +
> static void mma8452_push_transient_event(struct iio_dev *indio_dev,
> int chan, u64 ts)
> {
> @@ -464,8 +527,16 @@ static const struct iio_event_spec mma8452_transient_event[] = {
> */
> static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742");
>
> +static IIO_DEVICE_ATTR_NAMED(accel_transient_period,
> + in_accel_thresh_rising_period,
> + S_IRUGO | S_IWUSR,
> + mma8452_query_transient_period,
> + mma8452_set_transient_period,
> + 0);
> +
> static struct attribute *mma8452_event_attributes[] = {
> &iio_const_attr_accel_transient_scale.dev_attr.attr,
> + &iio_dev_attr_accel_transient_period.dev_attr.attr,
> NULL,
> };
>
>
> --
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>
--
Peter Meerwald
+43-664-2444418 (mobile)
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