[v3,6/9] staging: iio: tsl2x7x: correct IIO_EV_INFO_PERIOD values
diff mbox

Message ID 20180511001223.12378-7-masneyb@onstation.org
State New
Headers show

Commit Message

Brian Masney May 11, 2018, 12:12 a.m. UTC
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>
---
 drivers/staging/iio/light/tsl2x7x.c | 44 +++++++++++++++++++++----------------
 drivers/staging/iio/light/tsl2x7x.h |  1 -
 2 files changed, 25 insertions(+), 20 deletions(-)

Comments

Jonathan Cameron May 12, 2018, 11:21 a.m. UTC | #1
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

--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch
diff mbox

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