[PATCH v2 07/11] staging: iio: tsl2x7x: support 2.72 and 2.73 ALS increments

Brian Masney
2018-05-04T02:53:15Z

The driver assumed that the ALS increment was 2.72 ms, and the upper
range was 696 ms. Some other supported devices use 2.73 ms - 699 ms.
This patch adds support for the multiple ranges.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
I debated whether or not this change should even be included. I feel
pretty confident that I can cleanly fold the tsl2583 driver into this
driver once the staging graduation is done. Those devices have an ALS
range of 2.7 ms - 688.5 ms.

drivers/staging/iio/light/tsl2x7x.c | 50 +++++++++++++++++++++++++++++--------
1 file changed, 40 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
index 9b32054713fb..e3e37501829f 100644
--- a/drivers/staging/iio/light/tsl2x7x.c
+++ b/drivers/staging/iio/light/tsl2x7x.c
@@ -209,9 +209,9 @@ static const struct tsl2x7x_lux *tsl2x7x_default_lux_table_group[] = {
};

static const struct tsl2x7x_settings tsl2x7x_default_settings = {
- .als_time = 255, /* 2.73 ms */
+ .als_time = 255, /* 2.72 / 2.73 ms */
.als_gain = 0,
- .prox_time = 255, /* 2.73 ms */
+ .prox_time = 255, /* 2.72 / 2.73 ms */
.prox_gain = 0,
.wait_time = 255,
.als_prox_config = 0,
@@ -245,6 +245,24 @@ static const s16 tsl2x7x_prox_gain[] = {
8
};

+struct tsl2x7x_int_time {
+ int increment_us;
+ char *display_range;
+};
+
+static const struct tsl2x7x_int_time tsl2x7x_int_time[] = {
+ [tsl2571] = { 2720, "0.00272 - 0.696" },
+ [tsl2671] = { 2720, "0.00272 - 0.696" },
+ [tmd2671] = { 2720, "0.00272 - 0.696" },
+ [tsl2771] = { 2720, "0.00272 - 0.696" },
+ [tmd2771] = { 2720, "0.00272 - 0.696" },
+ [tsl2572] = { 2730, "0.00273 - 0.699" },
+ [tsl2672] = { 2730, "0.00273 - 0.699" },
+ [tmd2672] = { 2730, "0.00273 - 0.699" },
+ [tsl2772] = { 2730, "0.00273 - 0.699" },
+ [tmd2772] = { 2730, "0.00273 - 0.699" },
+};
+
/* Channel variations */
enum {
ALS,
@@ -626,7 +644,7 @@ static int tsl2x7x_chip_on(struct iio_dev *indio_dev)

/* set chip time scaling and saturation */
als_count = 256 - chip->settings.als_time;
- als_time_us = als_count * 2720;
+ als_time_us = als_count * tsl2x7x_int_time[chip->id].increment_us;
chip->als_saturation = als_count * 768; /* 75% of full scale */
chip->als_gain_time_scale = als_time_us *
tsl2x7x_als_gain[chip->settings.als_gain];
@@ -764,8 +782,16 @@ static IIO_CONST_ATTR(in_intensity0_calibscale_available, "1 8 16 120");

static IIO_CONST_ATTR(in_proximity0_calibscale_available, "1 2 4 8");

-static IIO_CONST_ATTR(in_intensity0_integration_time_available,
- ".00272 - .696");
+static ssize_t
+in_intensity0_integration_time_available_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tsl2X7X_chip *chip = iio_priv(dev_to_iio_dev(dev));
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ tsl2x7x_int_time[chip->id].display_range);
+}

static ssize_t in_illuminance0_target_input_show(struct device *dev,
struct device_attribute *attr,
@@ -1124,7 +1150,8 @@ static int tsl2x7x_read_raw(struct iio_dev *indio_dev,
break;
case IIO_CHAN_INFO_INT_TIME:
*val = 0;
- *val2 = (256 - chip->settings.als_time) * 2720;
+ *val2 = (256 - chip->settings.als_time) *
+ tsl2x7x_int_time[chip->id].increment_us;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
@@ -1184,7 +1211,8 @@ static int tsl2x7x_write_raw(struct iio_dev *indio_dev,
chip->settings.als_gain_trim = val;
break;
case IIO_CHAN_INFO_INT_TIME:
- chip->settings.als_time = 256 - (val2 / 2720);
+ chip->settings.als_time = 256 -
+ (val2 / tsl2x7x_int_time[chip->id].increment_us);
break;
default:
return -EINVAL;
@@ -1193,6 +1221,8 @@ static int tsl2x7x_write_raw(struct iio_dev *indio_dev,
return tsl2x7x_invoke_change(indio_dev);
}

+static DEVICE_ATTR_RO(in_intensity0_integration_time_available);
+
static DEVICE_ATTR_RW(in_illuminance0_target_input);

static DEVICE_ATTR_WO(in_illuminance0_calibrate);
@@ -1266,7 +1296,7 @@ static irqreturn_t tsl2x7x_event_handler(int irq, void *private)

static struct attribute *tsl2x7x_ALS_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
- &iio_const_attr_in_intensity0_integration_time_available.dev_attr.attr,
+ &dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
@@ -1280,7 +1310,7 @@ static struct attribute *tsl2x7x_PRX_device_attrs[] = {

static struct attribute *tsl2x7x_ALSPRX_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
- &iio_const_attr_in_intensity0_integration_time_available.dev_attr.attr,
+ &dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
@@ -1295,7 +1325,7 @@ static struct attribute *tsl2x7x_PRX2_device_attrs[] = {

static struct attribute *tsl2x7x_ALSPRX2_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
- &iio_const_attr_in_intensity0_integration_time_available.dev_attr.attr,
+ &dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
--
2.14.3