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From: Brian Masney <masneyb@onstation.org>
To: jic23@kernel.org, linux-iio@vger.kernel.org
Cc: devel@driverdev.osuosl.org, lars@metafoo.de,
	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
	pmeerw@pmeerw.net, knaack.h@gmx.de, drew.paterson@ams.com
Subject: [PATCH v3 6/9] staging: iio: tsl2x7x: correct IIO_EV_INFO_PERIOD values
Date: Thu, 10 May 2018 20:12:20 -0400	[thread overview]
Message-ID: <20180511001223.12378-7-masneyb@onstation.org> (raw)
In-Reply-To: <20180511001223.12378-1-masneyb@onstation.org>

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(-)

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
-- 
2.14.3

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  parent reply	other threads:[~2018-05-11  0:12 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11  0:12 [PATCH v3 0/9] staging: iio: tsl2x7x: move out of staging Brian Masney
2018-05-11  0:12 ` [PATCH v3 1/9] staging: iio: tsl2x7x: remove unnecessary whitespace Brian Masney
2018-05-12 11:15   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 2/9] staging: iio: tsl2x7x: use direct returns Brian Masney
2018-05-12 11:16   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 3/9] staging: iio: tsl2x7x: turn chip off if IIO device registration fails Brian Masney
2018-05-12 11:16   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 4/9] staging: iio: tsl2x7x: use macro to populate tsl2X7X_device_info Brian Masney
2018-05-12 11:20   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 5/9] staging: iio: tsl2x7x: convert to use read_avail Brian Masney
2018-05-12 11:20   ` Jonathan Cameron
2018-05-11  0:12 ` Brian Masney [this message]
2018-05-12 11:21   ` [PATCH v3 6/9] staging: iio: tsl2x7x: correct IIO_EV_INFO_PERIOD values Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 7/9] staging: iio: tsl2x7x: add range checking to tsl2x7x_write_raw Brian Masney
2018-05-12 11:23   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 8/9] staging: iio: tsl2x7x: rename driver to tsl2772 Brian Masney
2018-05-12 11:25   ` Jonathan Cameron
2018-05-11  0:12 ` [PATCH v3 9/9] staging: iio: tsl2x7x/tsl2772: move out of staging Brian Masney
2018-05-11  0:32   ` Brian Masney
2018-05-12 11:44     ` Jonathan Cameron
2018-05-12 12:36       ` Brian Masney
2018-05-12 17:44         ` Jonathan Cameron

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