1 // SPDX-License-Identifier: GPL-2.0-only
3  * zopt2201.c - Support for IDT ZOPT2201 ambient light and UV B sensor
5  * Copyright 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
7  * Datasheet: https://www.idt.com/document/dst/zopt2201-datasheet
8  * 7-bit I2C slave addresses 0x53 (default) or 0x52 (programmed)
39 #define ZOPT2201_MAIN_CTRL_LS_MODE	BIT(3) /* 0 .. ALS, 1 .. UV B */
105 	unsigned int bits; /* sensor resolution in bits */
181 	return i2c_smbus_write_byte_data(data->client, ZOPT2201_MAIN_CTRL, out);  in zopt2201_enable_mode()
186 	struct i2c_client *client = data->client;  in zopt2201_read()
191 	mutex_lock(&data->lock);  in zopt2201_read()
196 	while (tries--) {  in zopt2201_read()
197 		unsigned long t = zopt2201_resolution[data->res].us;  in zopt2201_read()
211 		ret = -ETIMEDOUT;  in zopt2201_read()
222 	mutex_unlock(&data->lock);  in zopt2201_read()
227 	mutex_unlock(&data->lock);  in zopt2201_read()
264 		ret = zopt2201_read(data, chan->address);  in zopt2201_read_raw()
274 			(1 << (20 - zopt2201_resolution[data->res].bits)) /  in zopt2201_read_raw()
275 			zopt2201_gain_uvb[data->gain].gain;  in zopt2201_read_raw()
278 		switch (chan->address) {  in zopt2201_read_raw()
280 			*val = zopt2201_gain_als[data->gain].scale;  in zopt2201_read_raw()
283 			*val = zopt2201_gain_uvb[data->gain].scale;  in zopt2201_read_raw()
286 			return -EINVAL;  in zopt2201_read_raw()
290 		*val2 *= (1 << (zopt2201_resolution[data->res].bits - 13));  in zopt2201_read_raw()
297 		*val2 = zopt2201_resolution[data->res].us;  in zopt2201_read_raw()
300 		return -EINVAL;  in zopt2201_read_raw()
308 	ret = i2c_smbus_write_byte_data(data->client, ZOPT2201_LS_MEAS_RATE,  in zopt2201_set_resolution()
310 					data->rate);  in zopt2201_set_resolution()
314 	data->res = res;  in zopt2201_set_resolution()
325 		return -EINVAL;  in zopt2201_write_resolution()
329 			mutex_lock(&data->lock);  in zopt2201_write_resolution()
331 			mutex_unlock(&data->lock);  in zopt2201_write_resolution()
335 	return -EINVAL;  in zopt2201_write_resolution()
342 	ret = i2c_smbus_write_byte_data(data->client, ZOPT2201_LS_GAIN, gain);  in zopt2201_set_gain()
346 	data->gain = gain;  in zopt2201_set_gain()
355 	mutex_lock(&data->lock);  in zopt2201_write_scale_als_by_idx()
363 	mutex_unlock(&data->lock);  in zopt2201_write_scale_als_by_idx()
378 	return -EINVAL;  in zopt2201_write_scale_als()
385 	mutex_lock(&data->lock);  in zopt2201_write_scale_uvb_by_idx()
393 	mutex_unlock(&data->lock);  in zopt2201_write_scale_uvb_by_idx()
407 	return -EINVAL;  in zopt2201_write_scale_uvb()
420 		switch (chan->address) {  in zopt2201_write_raw()
426 			return -EINVAL;  in zopt2201_write_raw()
430 	return -EINVAL;  in zopt2201_write_raw()
441 		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06lu ",  in zopt2201_show_int_time_available()
443 	buf[len - 1] = '\n';  in zopt2201_show_int_time_available()
458 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",  in zopt2201_show_als_scale_avail()
461 	buf[len - 1] = '\n';  in zopt2201_show_als_scale_avail()
474 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",  in zopt2201_show_uvb_scale_avail()
477 	buf[len - 1] = '\n';  in zopt2201_show_uvb_scale_avail()
510 	if (!i2c_check_functionality(client->adapter,  in zopt2201_probe()
512 		return -EOPNOTSUPP;  in zopt2201_probe()
518 		return -ENODEV;  in zopt2201_probe()
520 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in zopt2201_probe()
522 		return -ENOMEM;  in zopt2201_probe()
526 	data->client = client;  in zopt2201_probe()
527 	mutex_init(&data->lock);  in zopt2201_probe()
529 	indio_dev->info = &zopt2201_info;  in zopt2201_probe()
530 	indio_dev->channels = zopt2201_channels;  in zopt2201_probe()
531 	indio_dev->num_channels = ARRAY_SIZE(zopt2201_channels);  in zopt2201_probe()
532 	indio_dev->name = ZOPT2201_DRV_NAME;  in zopt2201_probe()
533 	indio_dev->modes = INDIO_DIRECT_MODE;  in zopt2201_probe()
535 	data->rate = ZOPT2201_MEAS_FREQ_100MS;  in zopt2201_probe()
544 	return devm_iio_device_register(&client->dev, indio_dev);  in zopt2201_probe()
563 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
564 MODULE_DESCRIPTION("IDT ZOPT2201 ambient light and UV B sensor driver");