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)
32 #define ZOPT2201_ALS_DATA		0x0d /* LSB first, 13 to 20 bits */
33 #define ZOPT2201_UVB_DATA		0x10 /* LSB first, 13 to 20 bits */
34 #define ZOPT2201_UV_COMP_DATA		0x13 /* LSB first, 13 to 20 bits */
35 #define ZOPT2201_COMP_DATA		0x16 /* LSB first, 13 to 20 bits */
179 	return i2c_smbus_write_byte_data(data->client, ZOPT2201_MAIN_CTRL, out);  in zopt2201_enable_mode()
184 	struct i2c_client *client = data->client;  in zopt2201_read()
189 	mutex_lock(&data->lock);  in zopt2201_read()
194 	while (tries--) {  in zopt2201_read()
195 		unsigned long t = zopt2201_resolution[data->res].us;  in zopt2201_read()
209 		ret = -ETIMEDOUT;  in zopt2201_read()
220 	mutex_unlock(&data->lock);  in zopt2201_read()
225 	mutex_unlock(&data->lock);  in zopt2201_read()
262 		ret = zopt2201_read(data, chan->address);  in zopt2201_read_raw()
272 			(1 << (20 - zopt2201_resolution[data->res].bits)) /  in zopt2201_read_raw()
273 			zopt2201_gain_uvb[data->gain].gain;  in zopt2201_read_raw()
276 		switch (chan->address) {  in zopt2201_read_raw()
278 			*val = zopt2201_gain_als[data->gain].scale;  in zopt2201_read_raw()
281 			*val = zopt2201_gain_uvb[data->gain].scale;  in zopt2201_read_raw()
284 			return -EINVAL;  in zopt2201_read_raw()
288 		*val2 *= (1 << (zopt2201_resolution[data->res].bits - 13));  in zopt2201_read_raw()
295 		*val2 = zopt2201_resolution[data->res].us;  in zopt2201_read_raw()
298 		return -EINVAL;  in zopt2201_read_raw()
306 	ret = i2c_smbus_write_byte_data(data->client, ZOPT2201_LS_MEAS_RATE,  in zopt2201_set_resolution()
308 					data->rate);  in zopt2201_set_resolution()
312 	data->res = res;  in zopt2201_set_resolution()
323 		return -EINVAL;  in zopt2201_write_resolution()
327 			mutex_lock(&data->lock);  in zopt2201_write_resolution()
329 			mutex_unlock(&data->lock);  in zopt2201_write_resolution()
333 	return -EINVAL;  in zopt2201_write_resolution()
340 	ret = i2c_smbus_write_byte_data(data->client, ZOPT2201_LS_GAIN, gain);  in zopt2201_set_gain()
344 	data->gain = gain;  in zopt2201_set_gain()
354 	mutex_lock(&data->lock);  in zopt2201_write_scale_by_idx()
362 	mutex_unlock(&data->lock);  in zopt2201_write_scale_by_idx()
376 	return -EINVAL;  in zopt2201_write_scale_als()
389 	return -EINVAL;  in zopt2201_write_scale_uvb()
402 		switch (chan->address) {  in zopt2201_write_raw()
408 			return -EINVAL;  in zopt2201_write_raw()
412 	return -EINVAL;  in zopt2201_write_raw()
423 		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06lu ",  in zopt2201_show_int_time_available()
425 	buf[len - 1] = '\n';  in zopt2201_show_int_time_available()
440 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",  in zopt2201_show_als_scale_avail()
443 	buf[len - 1] = '\n';  in zopt2201_show_als_scale_avail()
456 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",  in zopt2201_show_uvb_scale_avail()
459 	buf[len - 1] = '\n';  in zopt2201_show_uvb_scale_avail()
492 	if (!i2c_check_functionality(client->adapter,  in zopt2201_probe()
494 		return -EOPNOTSUPP;  in zopt2201_probe()
500 		return -ENODEV;  in zopt2201_probe()
502 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in zopt2201_probe()
504 		return -ENOMEM;  in zopt2201_probe()
508 	data->client = client;  in zopt2201_probe()
509 	mutex_init(&data->lock);  in zopt2201_probe()
511 	indio_dev->info = &zopt2201_info;  in zopt2201_probe()
512 	indio_dev->channels = zopt2201_channels;  in zopt2201_probe()
513 	indio_dev->num_channels = ARRAY_SIZE(zopt2201_channels);  in zopt2201_probe()
514 	indio_dev->name = ZOPT2201_DRV_NAME;  in zopt2201_probe()
515 	indio_dev->modes = INDIO_DIRECT_MODE;  in zopt2201_probe()
517 	data->rate = ZOPT2201_MEAS_FREQ_100MS;  in zopt2201_probe()
526 	return devm_iio_device_register(&client->dev, indio_dev);  in zopt2201_probe()
545 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");