1 // SPDX-License-Identifier: GPL-2.0-only
3  * htu21.c - Support for Measurement-Specialties
4  *           htu21 temperature & humidity sensor
5  *	     and humidity part of MS8607 sensor
7  * Copyright (c) 2014 Measurement-Specialties
9  * (7-bit I2C slave address 0x40)
12  *  http://www.meas-spec.com/downloads/HTU21D.pdf
14  *  http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
44 	unsigned int humidity;  in htu21_read_raw()  local
49 		switch (channel->type) {  in htu21_read_raw()
60 							  &humidity);  in htu21_read_raw()
63 			*val = humidity;  in htu21_read_raw()
67 			return -EINVAL;  in htu21_read_raw()
70 		*val = htu21_samp_freq[dev_data->res_index];  in htu21_read_raw()
74 		return -EINVAL;  in htu21_read_raw()
88 		while (i-- > 0)  in htu21_write_raw()
92 			return -EINVAL;  in htu21_write_raw()
93 		mutex_lock(&dev_data->lock);  in htu21_write_raw()
94 		dev_data->res_index = i;  in htu21_write_raw()
96 		mutex_unlock(&dev_data->lock);  in htu21_write_raw()
100 		return -EINVAL;  in htu21_write_raw()
188 	if (!i2c_check_functionality(client->adapter,  in htu21_probe()
192 		dev_err(&client->dev,  in htu21_probe()
194 		return -EOPNOTSUPP;  in htu21_probe()
197 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));  in htu21_probe()
199 		return -ENOMEM;  in htu21_probe()
202 	dev_data->client = client;  in htu21_probe()
203 	dev_data->res_index = 0;  in htu21_probe()
204 	mutex_init(&dev_data->lock);  in htu21_probe()
206 	indio_dev->info = &htu21_info;  in htu21_probe()
207 	indio_dev->name = id->name;  in htu21_probe()
208 	indio_dev->modes = INDIO_DIRECT_MODE;  in htu21_probe()
210 	if (id->driver_data == MS8607) {  in htu21_probe()
211 		indio_dev->channels = ms8607_channels;  in htu21_probe()
212 		indio_dev->num_channels = ARRAY_SIZE(ms8607_channels);  in htu21_probe()
214 		indio_dev->channels = htu21_channels;  in htu21_probe()
215 		indio_dev->num_channels = ARRAY_SIZE(htu21_channels);  in htu21_probe()
227 	dev_info(&client->dev, "Serial number : %llx", serial_number);  in htu21_probe()
229 	return devm_iio_device_register(&client->dev, indio_dev);  in htu21_probe()
234 	{"ms8607-humidity", MS8607},
241 	{ .compatible = "meas,ms8607-humidity", },
257 MODULE_DESCRIPTION("Measurement-Specialties htu21 temperature and humidity driver");
258 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");