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path: root/drivers/iio/light/ltr390.c
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Diffstat (limited to 'drivers/iio/light/ltr390.c')
-rw-r--r--drivers/iio/light/ltr390.c243
1 files changed, 221 insertions, 22 deletions
diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c
index fff1e899097d..4f6975e63a8f 100644
--- a/drivers/iio/light/ltr390.c
+++ b/drivers/iio/light/ltr390.c
@@ -23,20 +23,30 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
+#include <linux/bitfield.h>
#include <linux/iio/iio.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
-#define LTR390_MAIN_CTRL 0x00
-#define LTR390_PART_ID 0x06
-#define LTR390_UVS_DATA 0x10
+#define LTR390_MAIN_CTRL 0x00
+#define LTR390_ALS_UVS_MEAS_RATE 0x04
+#define LTR390_ALS_UVS_GAIN 0x05
+#define LTR390_PART_ID 0x06
+#define LTR390_ALS_DATA 0x0D
+#define LTR390_UVS_DATA 0x10
+#define LTR390_INT_CFG 0x19
+
+#define LTR390_PART_NUMBER_ID 0xb
+#define LTR390_ALS_UVS_GAIN_MASK 0x07
+#define LTR390_ALS_UVS_INT_TIME_MASK 0x70
+#define LTR390_ALS_UVS_INT_TIME(x) FIELD_PREP(LTR390_ALS_UVS_INT_TIME_MASK, (x))
#define LTR390_SW_RESET BIT(4)
#define LTR390_UVS_MODE BIT(3)
#define LTR390_SENSOR_ENABLE BIT(1)
-#define LTR390_PART_NUMBER_ID 0xb
+#define LTR390_FRACTIONAL_PRECISION 100
/*
* At 20-bit resolution (integration time: 400ms) and 18x gain, 2300 counts of
@@ -55,11 +65,19 @@
*/
#define LTR390_WINDOW_FACTOR 1
+enum ltr390_mode {
+ LTR390_SET_ALS_MODE,
+ LTR390_SET_UVS_MODE,
+};
+
struct ltr390_data {
struct regmap *regmap;
struct i2c_client *client;
/* Protects device from simulataneous reads */
struct mutex lock;
+ enum ltr390_mode mode;
+ int gain;
+ int int_time_us;
};
static const struct regmap_config ltr390_regmap_config = {
@@ -75,8 +93,6 @@ static int ltr390_register_read(struct ltr390_data *data, u8 register_address)
int ret;
u8 recieve_buffer[3];
- guard(mutex)(&data->lock);
-
ret = regmap_bulk_read(data->regmap, register_address, recieve_buffer,
sizeof(recieve_buffer));
if (ret) {
@@ -87,6 +103,38 @@ static int ltr390_register_read(struct ltr390_data *data, u8 register_address)
return get_unaligned_le24(recieve_buffer);
}
+static int ltr390_set_mode(struct ltr390_data *data, enum ltr390_mode mode)
+{
+ int ret;
+
+ if (data->mode == mode)
+ return 0;
+
+ switch (mode) {
+ case LTR390_SET_ALS_MODE:
+ ret = regmap_clear_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_UVS_MODE);
+ break;
+
+ case LTR390_SET_UVS_MODE:
+ ret = regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_UVS_MODE);
+ break;
+ }
+
+ if (ret)
+ return ret;
+
+ data->mode = mode;
+ return 0;
+}
+
+static int ltr390_counts_per_uvi(struct ltr390_data *data)
+{
+ const int orig_gain = 18;
+ const int orig_int_time = 400;
+
+ return DIV_ROUND_CLOSEST(23 * data->gain * data->int_time_us, 10 * orig_gain * orig_int_time);
+}
+
static int ltr390_read_raw(struct iio_dev *iio_device,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
@@ -94,29 +142,174 @@ static int ltr390_read_raw(struct iio_dev *iio_device,
int ret;
struct ltr390_data *data = iio_priv(iio_device);
+ guard(mutex)(&data->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
- ret = ltr390_register_read(data, LTR390_UVS_DATA);
- if (ret < 0)
- return ret;
+ switch (chan->type) {
+ case IIO_UVINDEX:
+ ret = ltr390_set_mode(data, LTR390_SET_UVS_MODE);
+ if (ret < 0)
+ return ret;
+
+ ret = ltr390_register_read(data, LTR390_UVS_DATA);
+ if (ret < 0)
+ return ret;
+ break;
+
+ case IIO_LIGHT:
+ ret = ltr390_set_mode(data, LTR390_SET_ALS_MODE);
+ if (ret < 0)
+ return ret;
+
+ ret = ltr390_register_read(data, LTR390_ALS_DATA);
+ if (ret < 0)
+ return ret;
+ break;
+
+ default:
+ return -EINVAL;
+ }
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- *val = LTR390_WINDOW_FACTOR;
- *val2 = LTR390_COUNTS_PER_UVI;
- return IIO_VAL_FRACTIONAL;
+ switch (chan->type) {
+ case IIO_UVINDEX:
+ *val = LTR390_WINDOW_FACTOR * LTR390_FRACTIONAL_PRECISION;
+ *val2 = ltr390_counts_per_uvi(data);
+ return IIO_VAL_FRACTIONAL;
+
+ case IIO_LIGHT:
+ *val = LTR390_WINDOW_FACTOR * 6 * 100;
+ *val2 = data->gain * data->int_time_us;
+ return IIO_VAL_FRACTIONAL;
+
+ default:
+ return -EINVAL;
+ }
+
+ case IIO_CHAN_INFO_INT_TIME:
+ *val = data->int_time_us;
+ return IIO_VAL_INT;
+
default:
return -EINVAL;
}
}
-static const struct iio_info ltr390_info = {
- .read_raw = ltr390_read_raw,
+/* integration time in us */
+static const int ltr390_int_time_map_us[] = { 400000, 200000, 100000, 50000, 25000, 12500 };
+static const int ltr390_gain_map[] = { 1, 3, 6, 9, 18 };
+
+static const struct iio_chan_spec ltr390_channels[] = {
+ /* UV sensor */
+ {
+ .type = IIO_UVINDEX,
+ .scan_index = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME),
+ .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE)
+ },
+ /* ALS sensor */
+ {
+ .type = IIO_LIGHT,
+ .scan_index = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME),
+ .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE)
+ },
};
-static const struct iio_chan_spec ltr390_channel = {
- .type = IIO_UVINDEX,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE)
+static int ltr390_set_gain(struct ltr390_data *data, int val)
+{
+ int ret, idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(ltr390_gain_map); idx++) {
+ if (ltr390_gain_map[idx] != val)
+ continue;
+
+ guard(mutex)(&data->lock);
+ ret = regmap_update_bits(data->regmap,
+ LTR390_ALS_UVS_GAIN,
+ LTR390_ALS_UVS_GAIN_MASK, idx);
+ if (ret)
+ return ret;
+
+ data->gain = ltr390_gain_map[idx];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int ltr390_set_int_time(struct ltr390_data *data, int val)
+{
+ int ret, idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(ltr390_int_time_map_us); idx++) {
+ if (ltr390_int_time_map_us[idx] != val)
+ continue;
+
+ guard(mutex)(&data->lock);
+ ret = regmap_update_bits(data->regmap,
+ LTR390_ALS_UVS_MEAS_RATE,
+ LTR390_ALS_UVS_INT_TIME_MASK,
+ LTR390_ALS_UVS_INT_TIME(idx));
+ if (ret)
+ return ret;
+
+ data->int_time_us = ltr390_int_time_map_us[idx];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int ltr390_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length, long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ *length = ARRAY_SIZE(ltr390_gain_map);
+ *type = IIO_VAL_INT;
+ *vals = ltr390_gain_map;
+ return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_INT_TIME:
+ *length = ARRAY_SIZE(ltr390_int_time_map_us);
+ *type = IIO_VAL_INT;
+ *vals = ltr390_int_time_map_us;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ltr390_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct ltr390_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ if (val2 != 0)
+ return -EINVAL;
+
+ return ltr390_set_gain(data, val);
+
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val2 != 0)
+ return -EINVAL;
+
+ return ltr390_set_int_time(data, val);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info ltr390_info = {
+ .read_raw = ltr390_read_raw,
+ .write_raw = ltr390_write_raw,
+ .read_avail = ltr390_read_avail,
};
static int ltr390_probe(struct i2c_client *client)
@@ -139,11 +332,18 @@ static int ltr390_probe(struct i2c_client *client)
"regmap initialization failed\n");
data->client = client;
+ /* default value of integration time from pg: 15 of the datasheet */
+ data->int_time_us = 100000;
+ /* default value of gain from pg: 16 of the datasheet */
+ data->gain = 3;
+ /* default mode for ltr390 is ALS mode */
+ data->mode = LTR390_SET_ALS_MODE;
+
mutex_init(&data->lock);
indio_dev->info = &ltr390_info;
- indio_dev->channels = &ltr390_channel;
- indio_dev->num_channels = 1;
+ indio_dev->channels = ltr390_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ltr390_channels);
indio_dev->name = "ltr390";
ret = regmap_read(data->regmap, LTR390_PART_ID, &part_number);
@@ -161,8 +361,7 @@ static int ltr390_probe(struct i2c_client *client)
/* Wait for the registers to reset before proceeding */
usleep_range(1000, 2000);
- ret = regmap_set_bits(data->regmap, LTR390_MAIN_CTRL,
- LTR390_SENSOR_ENABLE | LTR390_UVS_MODE);
+ ret = regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SENSOR_ENABLE);
if (ret)
return dev_err_probe(dev, ret, "failed to enable the sensor\n");
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-21 02:33:14 +0300