1 // SPDX-License-Identifier: GPL-2.0-only
3  * tsys01.c - Support for Measurement-Specialties tsys01 temperature sensor
5  * Copyright (c) 2015 Measurement-Specialties
8  *  http://www.meas-spec.com/downloads/TSYS01_Digital_Temperature_Sensor.pdf
34 	int (*reset)(void *cli, u8 cmd, unsigned int delay);
37 	int (*read_prom_word)(void *cli, int cmd, u16 *word);
43 static const int coeff_mul[] = { -1500000, 1000000, -2000000,
44 				 4000000, -2000000 };
54 	mutex_lock(&dev_data->lock);  in tsys01_read_temperature()
55 	ret = dev_data->convert_and_read(dev_data->client,  in tsys01_read_temperature()
58 	mutex_unlock(&dev_data->lock);  in tsys01_read_temperature()
65 	for (i = 4; i > 0; i--) {  in tsys01_read_temperature()
67 			(s64)dev_data->prom[5 - i];  in tsys01_read_temperature()
72 	temp += coeff_mul[0] * (s64)dev_data->prom[5];  in tsys01_read_temperature()
89 		switch (channel->type) {  in tsys01_read_raw()
98 			return -EINVAL;  in tsys01_read_raw()
101 		return -EINVAL;  in tsys01_read_raw()
118 	u8 cnt;  in tsys01_crc_valid()  local
121 	for (cnt = 0; cnt < TSYS01_PROM_WORDS_NB; cnt++)  in tsys01_crc_valid()
135 		ret = dev_data->read_prom_word(dev_data->client,  in tsys01_read_prom()
137 					       &dev_data->prom[i]);  in tsys01_read_prom()
141 		ret = sprintf(ptr, "0x%04x ", dev_data->prom[i]);  in tsys01_read_prom()
145 	if (!tsys01_crc_valid(dev_data->prom)) {  in tsys01_read_prom()
146 		dev_err(&indio_dev->dev, "prom crc check error\n");  in tsys01_read_prom()
147 		return -ENODEV;  in tsys01_read_prom()
150 	dev_info(&indio_dev->dev, "PROM coefficients : %s\n", buf);  in tsys01_read_prom()
160 	mutex_init(&dev_data->lock);  in tsys01_probe()
162 	indio_dev->info = &tsys01_info;  in tsys01_probe()
163 	indio_dev->name = dev->driver->name;  in tsys01_probe()
164 	indio_dev->modes = INDIO_DIRECT_MODE;  in tsys01_probe()
165 	indio_dev->channels = tsys01_channels;  in tsys01_probe()
166 	indio_dev->num_channels = ARRAY_SIZE(tsys01_channels);  in tsys01_probe()
168 	ret = dev_data->reset(dev_data->client, TSYS01_RESET, 3000);  in tsys01_probe()
184 	if (!i2c_check_functionality(client->adapter,  in tsys01_i2c_probe()
188 		dev_err(&client->dev,  in tsys01_i2c_probe()
190 		return -EOPNOTSUPP;  in tsys01_i2c_probe()
193 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));  in tsys01_i2c_probe()
195 		return -ENOMEM;  in tsys01_i2c_probe()
198 	dev_data->client = client;  in tsys01_i2c_probe()
199 	dev_data->reset = ms_sensors_reset;  in tsys01_i2c_probe()
200 	dev_data->read_prom_word = ms_sensors_read_prom_word;  in tsys01_i2c_probe()
201 	dev_data->convert_and_read = ms_sensors_convert_and_read;  in tsys01_i2c_probe()
205 	return tsys01_probe(indio_dev, &client->dev);  in tsys01_i2c_probe()
224 		   .name = "tsys01",
231 MODULE_DESCRIPTION("Measurement-Specialties tsys01 temperature driver");
232 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");