iio/light/ltr390.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * IIO driver for Lite-On LTR390 ALS and UV sensor
4  * (7-bit I2C slave address 0x53)
6  * Based on the work of:
12 …*   https://optoelectronics.liteon.com/upload/download/DS86-2015-0004/LTR-390UV_Final_%20DS_V1%201…
15  *   - Support for configurable gain and resolution
16  *   - Sensor suspend/resume support
17  *   - Add support for reading the ALS
18  *   - Interrupt support
42  * At 20-bit resolution (integration time: 400ms) and 18x gain, 2300 counts of
45  * For the default resolution of 18-bit (integration time: 100ms) and default
46  * gain of 3x, the counts/uvi are calculated as follows:
53  * tinted ink. This is to compensate for the light loss due to the lower
54  * transmission rate of the window glass and helps * in calculating lux.
62 	struct mutex lock;  member
74 	struct device *dev = &data->client->dev;  in ltr390_register_read()
78 	guard(mutex)(&data->lock);  in ltr390_register_read()
80 	ret = regmap_bulk_read(data->regmap, register_address, recieve_buffer,  in ltr390_register_read()
109 		return -EINVAL;  in ltr390_read_raw()
129 	dev = &client->dev;  in ltr390_probe()
132 		return -ENOMEM;  in ltr390_probe()
136 	data->regmap = devm_regmap_init_i2c(client, &ltr390_regmap_config);  in ltr390_probe()
137 	if (IS_ERR(data->regmap))  in ltr390_probe()
138 		return dev_err_probe(dev, PTR_ERR(data->regmap),  in ltr390_probe()
141 	data->client = client;  in ltr390_probe()
142 	mutex_init(&data->lock);  in ltr390_probe()
144 	indio_dev->info = &ltr390_info;  in ltr390_probe()
145 	indio_dev->channels = &ltr390_channel;  in ltr390_probe()
146 	indio_dev->num_channels = 1;  in ltr390_probe()
147 	indio_dev->name = "ltr390";  in ltr390_probe()
149 	ret = regmap_read(data->regmap, LTR390_PART_ID, &part_number);  in ltr390_probe()
153 	/* Lower 4 bits of `part_number` change with hardware revisions */  in ltr390_probe()
159 	regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SW_RESET);  in ltr390_probe()
164 	ret = regmap_set_bits(data->regmap, LTR390_MAIN_CTRL,  in ltr390_probe()
182 MODULE_DEVICE_TABLE(of, ltr390_of_table);
195 MODULE_DESCRIPTION("Lite-On LTR390 ALS and UV sensor Driver");