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iio: light: ltrf216a: Add LTR-308 support

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Add LiteOn LTR-308 support into LTR-F216A kernel driver.

The two devices seem to have almost identical register map, except that
the LTR-308 does not have three CLEAR_DATA registers, which are unused
by this driver. Furthermore, LTR-308 and LTR-F216A use different lux
calculation constants, 0.6 and 0.45 respectively. Both differences are
handled using chip info data.

https://optoelectronics.liteon.com/upload/download/DS86-2016-0027/LTR-308ALS_Final_%20DS_V1%201.pdf
https://optoelectronics.liteon.com/upload/download/DS86-2019-0016/LTR-F216A_Final_DS_V1.4.PDF

Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20240708114227.18283-2-marex@denx.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Marek Vasut 2024-07-08 13:41:18 +02:00 committed by Jonathan Cameron
parent 14c0956274
commit 7c7d917030
1 changed files with 43 additions and 10 deletions
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53
drivers/iio/light/ltrf216a.c
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@ -68,6 +68,13 @@ static const int ltrf216a_int_time_reg[][2] = {
{ 25, 0x40 },
};
struct ltr_chip_info {
/* Chip contains CLEAR_DATA_0/1/2 registers at offset 0xa..0xc */
bool has_clear_data;
/* Lux calculation multiplier for ALS data */
int lux_multiplier;
};
/*
* Window Factor is needed when the device is under Window glass
* with coated tinted ink. This is to compensate for the light loss
@ -79,6 +86,7 @@ static const int ltrf216a_int_time_reg[][2] = {
struct ltrf216a_data {
struct regmap *regmap;
struct i2c_client *client;
const struct ltr_chip_info *info;
u32 int_time;
u16 int_time_fac;
u8 als_gain_fac;
@ -246,7 +254,7 @@ static int ltrf216a_get_lux(struct ltrf216a_data *data)
ltrf216a_set_power_state(data, false);
lux = greendata * 45 * LTRF216A_WIN_FAC;
lux = greendata * data->info->lux_multiplier * LTRF216A_WIN_FAC;
return lux;
}
@ -334,15 +342,15 @@ static const struct iio_info ltrf216a_info = {
static bool ltrf216a_readable_reg(struct device *dev, unsigned int reg)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct ltrf216a_data *data = iio_priv(indio_dev);
switch (reg) {
case LTRF216A_MAIN_CTRL:
case LTRF216A_ALS_MEAS_RES:
case LTRF216A_ALS_GAIN:
case LTRF216A_PART_ID:
case LTRF216A_MAIN_STATUS:
case LTRF216A_ALS_CLEAR_DATA_0:
case LTRF216A_ALS_CLEAR_DATA_1:
case LTRF216A_ALS_CLEAR_DATA_2:
case LTRF216A_ALS_DATA_0:
case LTRF216A_ALS_DATA_1:
case LTRF216A_ALS_DATA_2:
@ -355,6 +363,10 @@ static bool ltrf216a_readable_reg(struct device *dev, unsigned int reg)
case LTRF216A_ALS_THRES_LOW_1:
case LTRF216A_ALS_THRES_LOW_2:
return true;
case LTRF216A_ALS_CLEAR_DATA_0:
case LTRF216A_ALS_CLEAR_DATA_1:
case LTRF216A_ALS_CLEAR_DATA_2:
return data->info->has_clear_data;
default:
return false;
}
@ -382,15 +394,23 @@ static bool ltrf216a_writable_reg(struct device *dev, unsigned int reg)
static bool ltrf216a_volatile_reg(struct device *dev, unsigned int reg)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct ltrf216a_data *data = iio_priv(indio_dev);
switch (reg) {
case LTRF216A_MAIN_STATUS:
case LTRF216A_ALS_CLEAR_DATA_0:
case LTRF216A_ALS_CLEAR_DATA_1:
case LTRF216A_ALS_CLEAR_DATA_2:
case LTRF216A_ALS_DATA_0:
case LTRF216A_ALS_DATA_1:
case LTRF216A_ALS_DATA_2:
return true;
/*
* If these registers are not present on a chip (like LTR-308),
* the missing registers are not considered volatile.
*/
case LTRF216A_ALS_CLEAR_DATA_0:
case LTRF216A_ALS_CLEAR_DATA_1:
case LTRF216A_ALS_CLEAR_DATA_2:
return data->info->has_clear_data;
default:
return false;
}
@ -433,6 +453,7 @@ static int ltrf216a_probe(struct i2c_client *client)
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->info = i2c_get_match_data(client);
mutex_init(&data->lock);
@ -520,15 +541,27 @@ static int ltrf216a_runtime_resume(struct device *dev)
static DEFINE_RUNTIME_DEV_PM_OPS(ltrf216a_pm_ops, ltrf216a_runtime_suspend,
ltrf216a_runtime_resume, NULL);
static const struct ltr_chip_info ltr308_chip_info = {
.has_clear_data = false,
.lux_multiplier = 60,
};
static const struct ltr_chip_info ltrf216a_chip_info = {
.has_clear_data = true,
.lux_multiplier = 45,
};
static const struct i2c_device_id ltrf216a_id[] = {
{ "ltrf216a" },
{ "ltr308", .driver_data = (kernel_ulong_t)&ltr308_chip_info },
{ "ltrf216a", .driver_data = (kernel_ulong_t)&ltrf216a_chip_info },
{}
};
MODULE_DEVICE_TABLE(i2c, ltrf216a_id);
static const struct of_device_id ltrf216a_of_match[] = {
{ .compatible = "liteon,ltrf216a" },
{ .compatible = "ltr,ltrf216a" },
{ .compatible = "liteon,ltr308", .data = &ltr308_chip_info },
{ .compatible = "liteon,ltrf216a", .data = &ltrf216a_chip_info },
{ .compatible = "ltr,ltrf216a", .data = &ltrf216a_chip_info },
{}
};
MODULE_DEVICE_TABLE(of, ltrf216a_of_match);