#define ISL29035_BOUT_SHIFT 0x07
#define ISL29035_BOUT_MASK (0x01 << ISL29035_BOUT_SHIFT)
+#define ISL29018_INT_TIME_AVAIL "0.090000 0.005630 0.000351 0.000021"
+#define ISL29023_INT_TIME_AVAIL "0.090000 0.005600 0.000352 0.000022"
+#define ISL29035_INT_TIME_AVAIL "0.105000 0.006500 0.000410 0.000025"
+
+static const char * const int_time_avail[] = {
+ ISL29018_INT_TIME_AVAIL,
+ ISL29023_INT_TIME_AVAIL,
+ ISL29035_INT_TIME_AVAIL,
+};
+
+enum isl29018_int_time {
+ ISL29018_INT_TIME_16,
+ ISL29018_INT_TIME_12,
+ ISL29018_INT_TIME_8,
+ ISL29018_INT_TIME_4,
+};
+
+static const unsigned int isl29018_int_utimes[3][4] = {
+ {90000, 5630, 351, 21},
+ {90000, 5600, 352, 22},
+ {105000, 6500, 410, 25},
+};
+
+static const struct isl29018_scale {
+ unsigned int scale;
+ unsigned int uscale;
+} isl29018_scales[4][4] = {
+ { {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} },
+ { {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} },
+ { {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} },
+ { {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} }
+};
+
struct isl29018_chip {
struct device *dev;
struct regmap *regmap;
int type;
unsigned int calibscale;
unsigned int ucalibscale;
- unsigned int range;
- unsigned int adc_bit;
+ unsigned int int_time;
+ struct isl29018_scale scale;
int prox_scheme;
bool suspended;
};
-static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range,
- unsigned int *new_range)
+static int isl29018_set_integration_time(struct isl29018_chip *chip,
+ unsigned int utime)
{
- static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
- int i;
-
- for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
- if (range <= supp_ranges[i]) {
- *new_range = (unsigned int)supp_ranges[i];
+ int i, ret;
+ unsigned int int_time, new_int_time;
+ struct isl29018_scale new_scale;
+
+ for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) {
+ if (utime == isl29018_int_utimes[chip->type][i]) {
+ new_int_time = i;
+ new_scale = isl29018_scales[new_int_time][0];
break;
}
}
- if (i >= ARRAY_SIZE(supp_ranges))
+ if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type]))
return -EINVAL;
- return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
- COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT);
+ ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
+ COMMANDII_RESOLUTION_MASK,
+ i << COMMANDII_RESOLUTION_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ /* keep the same range when integration time changes */
+ int_time = chip->int_time;
+ for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) {
+ if (chip->scale.scale == isl29018_scales[int_time][i].scale &&
+ chip->scale.uscale == isl29018_scales[int_time][i].uscale) {
+ chip->scale = isl29018_scales[new_int_time][i];
+ break;
+ }
+ }
+ chip->int_time = new_int_time;
+
+ return 0;
}
-static int isl29018_set_resolution(struct isl29018_chip *chip,
- unsigned long adcbit, unsigned int *conf_adc_bit)
+static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale)
{
- static const unsigned long supp_adcbit[] = {16, 12, 8, 4};
- int i;
+ int i, ret;
+ struct isl29018_scale new_scale;
- for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
- if (adcbit >= supp_adcbit[i]) {
- *conf_adc_bit = (unsigned int)supp_adcbit[i];
+ for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) {
+ if (scale == isl29018_scales[chip->int_time][i].scale &&
+ uscale == isl29018_scales[chip->int_time][i].uscale) {
+ new_scale = isl29018_scales[chip->int_time][i];
break;
}
}
- if (i >= ARRAY_SIZE(supp_adcbit))
+ if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time]))
return -EINVAL;
- return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
- COMMANDII_RESOLUTION_MASK,
- i << COMMANDII_RESOLUTION_SHIFT);
+ ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
+ COMMANDII_RANGE_MASK,
+ i << COMMANDII_RANGE_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ chip->scale = new_scale;
+
+ return 0;
}
static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
{
int lux_data;
- unsigned int data_x_range, lux_unshifted;
+ unsigned int data_x_range;
lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);
if (lux_data < 0)
return lux_data;
- /* To support fractional scaling, separate the unshifted lux
- * into two calculations: int scaling and micro-scaling.
- * ucalibscale ranges from 0-999999, so about 20 bits. Split
- * the /1,000,000 in two to reduce the risk of over/underflow.
- */
- data_x_range = lux_data * chip->range;
- lux_unshifted = data_x_range * chip->calibscale;
- lux_unshifted += data_x_range / 1000 * chip->ucalibscale / 1000;
- *lux = lux_unshifted >> chip->adc_bit;
+ data_x_range = lux_data * chip->scale.scale +
+ lux_data * chip->scale.uscale / 1000000;
+ *lux = data_x_range * chip->calibscale +
+ data_x_range * chip->ucalibscale / 1000000;
return 0;
}
return 0;
}
-/* Sysfs interface */
+static ssize_t show_scale_available(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct isl29018_chip *chip = iio_priv(indio_dev);
+ int i, len = 0;
+
+ for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i)
+ len += sprintf(buf + len, "%d.%06d ",
+ isl29018_scales[chip->int_time][i].scale,
+ isl29018_scales[chip->int_time][i].uscale);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t show_int_time_available(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct isl29018_chip *chip = iio_priv(indio_dev);
+ int i, len = 0;
+
+ for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i)
+ len += sprintf(buf + len, "0.%06d ",
+ isl29018_int_utimes[chip->type][i]);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
/* proximity scheme */
static ssize_t show_prox_infrared_suppression(struct device *dev,
struct device_attribute *attr, char *buf)
int ret = -EINVAL;
mutex_lock(&chip->lock);
- if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
- chip->calibscale = val;
- /* With no write_raw_get_fmt(), val2 is a MICRO fraction. */
- chip->ucalibscale = val2;
- ret = 0;
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBSCALE:
+ if (chan->type == IIO_LIGHT) {
+ chip->calibscale = val;
+ chip->ucalibscale = val2;
+ ret = 0;
+ }
+ break;
+ case IIO_CHAN_INFO_INT_TIME:
+ if (chan->type == IIO_LIGHT)
+ if (val != 0) {
+ mutex_unlock(&chip->lock);
+ return -EINVAL;
+ }
+ ret = isl29018_set_integration_time(chip, val2);
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_LIGHT)
+ ret = isl29018_set_scale(chip, val, val2);
+ break;
+ default:
+ break;
}
mutex_unlock(&chip->lock);
if (!ret)
ret = IIO_VAL_INT;
break;
+ case IIO_CHAN_INFO_INT_TIME:
+ if (chan->type == IIO_LIGHT) {
+ *val = 0;
+ *val2 = isl29018_int_utimes[chip->type][chip->int_time];
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ }
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_LIGHT) {
+ *val = chip->scale.scale;
+ *val2 = chip->scale.uscale;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ }
+ break;
case IIO_CHAN_INFO_CALIBSCALE:
if (chan->type == IIO_LIGHT) {
*val = chip->calibscale;
.indexed = 1, \
.channel = 0, \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | \
- BIT(IIO_CHAN_INFO_CALIBSCALE), \
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_INT_TIME), \
}
#define ISL29018_IR_CHANNEL { \
ISL29018_IR_CHANNEL,
};
+static IIO_DEVICE_ATTR(in_illuminance_integration_time_available, S_IRUGO,
+ show_int_time_available, NULL, 0);
+static IIO_DEVICE_ATTR(in_illuminance_scale_available, S_IRUGO,
+ show_scale_available, NULL, 0);
static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_suppression,
S_IRUGO | S_IWUSR,
show_prox_infrared_suppression,
store_prox_infrared_suppression, 0);
#define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
-#define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
+
static struct attribute *isl29018_attributes[] = {
+ ISL29018_DEV_ATTR(in_illuminance_scale_available),
+ ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
NULL
};
static struct attribute *isl29023_attributes[] = {
+ ISL29018_DEV_ATTR(in_illuminance_scale_available),
+ ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
NULL
};
static int isl29018_chip_init(struct isl29018_chip *chip)
{
int status;
- unsigned int new_adc_bit;
- unsigned int new_range;
if (chip->type == isl29035) {
status = isl29035_detect(chip);
usleep_range(1000, 2000); /* per data sheet, page 10 */
/* set defaults */
- status = isl29018_set_range(chip, chip->range, &new_range);
+ status = isl29018_set_scale(chip, chip->scale.scale,
+ chip->scale.uscale);
if (status < 0) {
dev_err(chip->dev, "Init of isl29018 fails\n");
return status;
}
- status = isl29018_set_resolution(chip, chip->adc_bit,
- &new_adc_bit);
+ status = isl29018_set_integration_time(chip,
+ isl29018_int_utimes[chip->type][chip->int_time]);
+ if (status < 0) {
+ dev_err(chip->dev, "Init of isl29018 fails\n");
+ return status;
+ }
return 0;
}
chip->type = dev_id;
chip->calibscale = 1;
chip->ucalibscale = 0;
- chip->range = 1000;
- chip->adc_bit = 16;
+ chip->int_time = ISL29018_INT_TIME_16;
+ chip->scale = isl29018_scales[chip->int_time][0];
chip->suspended = false;
chip->regmap = devm_regmap_init_i2c(client,
projects / users / hch / uuid.git / commitdiff