1 // SPDX-License-Identifier: GPL-2.0+
3  * ens210.c - Support for ScioSense ens210 temperature & humidity sensor family
5  * (7-bit I2C slave address 0x43 ENS210)
6  * (7-bit I2C slave address 0x43 ENS210A)
7  * (7-bit I2C slave address 0x44 ENS211)
8  * (7-bit I2C slave address 0x45 ENS212)
9  * (7-bit I2C slave address 0x46 ENS213A)
10  * (7-bit I2C slave address 0x47 ENS215)
13  *  https://www.sciosense.com/wp-content/uploads/2024/04/ENS21x-Datasheet.pdf
14  *  https://www.sciosense.com/wp-content/uploads/2023/12/ENS210-Datasheet.pdf
62  * struct ens210_chip_info - Humidity/Temperature chip specific information
74  * struct ens210_data - Humidity/Temperature sensor device structure
86 /* calculate 17-bit crc7 */
97 	struct device *dev = &data->client->dev;  in ens210_get_measurement()
103 	ret = i2c_smbus_write_byte_data(data->client, ENS210_REG_SENS_START,  in ens210_get_measurement()
110 	msleep(data->chip_info->conv_time_msec);  in ens210_get_measurement()
112 	ret = i2c_smbus_read_byte_data(data->client, ENS210_REG_SENS_STAT);  in ens210_get_measurement()
118 		data->client, temp ? ENS210_REG_T_VAL : ENS210_REG_H_VAL, 3,  in ens210_get_measurement()
122 		return -EIO;  in ens210_get_measurement()
126 		return -EIO;  in ens210_get_measurement()
132 		return -EIO;  in ens210_get_measurement()
137 		return -EIO;  in ens210_get_measurement()
153 		scoped_guard(mutex, &data->lock) {  in ens210_read_raw()
155 				indio_dev, channel->type == IIO_TEMP, val);  in ens210_read_raw()
160 		return -EINVAL; /* compiler warning workaround */  in ens210_read_raw()
162 		if (channel->type == IIO_TEMP) {  in ens210_read_raw()
171 		*val = -17481;  in ens210_read_raw()
175 		return -EINVAL;  in ens210_read_raw()
204 	if (!i2c_check_functionality(client->adapter,  in ens210_probe()
208 		return dev_err_probe(&client->dev, -EOPNOTSUPP,  in ens210_probe()
212 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in ens210_probe()
214 		return -ENOMEM;  in ens210_probe()
217 	data->client = client;  in ens210_probe()
218 	mutex_init(&data->lock);  in ens210_probe()
219 	data->chip_info = i2c_get_match_data(client);  in ens210_probe()
221 	ret = devm_regulator_get_enable(&client->dev, "vdd");  in ens210_probe()
248 	if (part_id != data->chip_info->part_id) {  in ens210_probe()
249 		dev_info(&client->dev,  in ens210_probe()
251 			 data->chip_info->part_id);  in ens210_probe()
260 	indio_dev->name = data->chip_info->name;  in ens210_probe()
261 	indio_dev->modes = INDIO_DIRECT_MODE;  in ens210_probe()
262 	indio_dev->channels = ens210_channels;  in ens210_probe()
263 	indio_dev->num_channels = ARRAY_SIZE(ens210_channels);  in ens210_probe()
264 	indio_dev->info = &ens210_info;  in ens210_probe()
266 	return devm_iio_device_register(&client->dev, indio_dev);  in ens210_probe()