Commit 7c7d9170 authored by Marek Vasut's avatar Marek Vasut Committed by Jonathan Cameron
Browse files

iio: light: ltrf216a: Add LTR-308 support 

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: default avatarMarek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20240708114227.18283-2-marex@denx.de


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 14c09562

drivers/iio/light/ltrf216a.c

+43 −10
Original line number Diff line number Diff line
@@ -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);