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SubjectRe: [PATCH v3 6/9] staging: iio: tsl2x7x: correct IIO_EV_INFO_PERIOD values
On Thu, 10 May 2018 20:12:20 -0400
Brian Masney <masneyb@onstation.org> wrote:

> The thresh periods assumed an integration time of 3ms. This patch adds
> support for the correct integration time (2.72ms or 2.73ms). The code
> had the ALS filter values as going up to 15, however the values actually
> went up to 60 since the values scaled in increments of 5 once the
> persistence value went above 3.
>
> Signed-off-by: Brian Masney <masneyb@onstation.org>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
> drivers/staging/iio/light/tsl2x7x.c | 44 +++++++++++++++++++++----------------
> drivers/staging/iio/light/tsl2x7x.h | 1 -
> 2 files changed, 25 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 2d713d3c7c7b..0218eabcd6d7 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -103,8 +103,6 @@
> #define TSL2X7X_CNTL_PROXPON_ENBL 0x0F
> #define TSL2X7X_CNTL_INTPROXPON_ENBL 0x2F
>
> -#define TSL2X7X_MIN_ITIME 3
> -
> /* TAOS txx2x7x Device family members */
> enum {
> tsl2571,
> @@ -984,7 +982,7 @@ static int tsl2x7x_write_event_value(struct iio_dev *indio_dev,
> int val, int val2)
> {
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> - int ret = -EINVAL, y, z, filter_delay;
> + int ret = -EINVAL, count, persistence;
> u8 time;
>
> switch (info) {
> @@ -1023,15 +1021,20 @@ static int tsl2x7x_write_event_value(struct iio_dev *indio_dev,
> else
> time = chip->settings.prox_time;
>
> - y = (TSL2X7X_MAX_TIMER_CNT - time) + 1;
> - z = y * TSL2X7X_MIN_ITIME;
> + count = 256 - time;
> + persistence = ((val * 1000000) + val2) /
> + (count * tsl2x7x_int_time_avail[chip->id][3]);
>
> - filter_delay = DIV_ROUND_UP((val * 1000) + val2, z);
> + if (chan->type == IIO_INTENSITY) {
> + /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
> + if (persistence > 3)
> + persistence = (persistence / 5) + 3;
> +
> + chip->settings.als_persistence = persistence;
> + } else {
> + chip->settings.prox_persistence = persistence;
> + }
>
> - if (chan->type == IIO_INTENSITY)
> - chip->settings.als_persistence = filter_delay;
> - else
> - chip->settings.prox_persistence = filter_delay;
> ret = 0;
> break;
> default:
> @@ -1052,7 +1055,7 @@ static int tsl2x7x_read_event_value(struct iio_dev *indio_dev,
> int *val, int *val2)
> {
> struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> - int filter_delay, mult;
> + int filter_delay, persistence;
> u8 time;
>
> switch (info) {
> @@ -1084,18 +1087,21 @@ static int tsl2x7x_read_event_value(struct iio_dev *indio_dev,
> case IIO_EV_INFO_PERIOD:
> if (chan->type == IIO_INTENSITY) {
> time = chip->settings.als_time;
> - mult = chip->settings.als_persistence;
> + persistence = chip->settings.als_persistence;
> +
> + /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
> + if (persistence > 3)
> + persistence = (persistence - 3) * 5;
> } else {
> time = chip->settings.prox_time;
> - mult = chip->settings.prox_persistence;
> + persistence = chip->settings.prox_persistence;
> }
>
> - /* Determine integration time */
> - *val = (TSL2X7X_MAX_TIMER_CNT - time) + 1;
> - *val2 = *val * TSL2X7X_MIN_ITIME;
> - filter_delay = *val2 * mult;
> - *val = filter_delay / 1000;
> - *val2 = filter_delay % 1000;
> + filter_delay = persistence * (256 - time) *
> + tsl2x7x_int_time_avail[chip->id][3];
> +
> + *val = filter_delay / 1000000;
> + *val2 = filter_delay % 1000000;
> return IIO_VAL_INT_PLUS_MICRO;
> default:
> return -EINVAL;
> diff --git a/drivers/staging/iio/light/tsl2x7x.h b/drivers/staging/iio/light/tsl2x7x.h
> index db344796fc1b..b86f6b260f9f 100644
> --- a/drivers/staging/iio/light/tsl2x7x.h
> +++ b/drivers/staging/iio/light/tsl2x7x.h
> @@ -31,7 +31,6 @@ struct tsl2x7x_lux {
> #define TSL2X7X_50_mA 0x01
> #define TSL2X7X_25_mA 0x02
> #define TSL2X7X_13_mA 0x03
> -#define TSL2X7X_MAX_TIMER_CNT 0xFF
>
> /**
> * struct tsl2x7x_settings - Settings for the tsl2x7x driver

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