1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * sbtsi_temp.c - hwmon driver for a SBI Temperature Sensor Interface (SB-TSI)
19  * SB-TSI registers only support SMBus byte data access. "_INT" registers are
44  * From SB-TSI spec: CPU temperature readings and limit registers encode the
46  * register encodes the base-2 of the integer portion, and the upper 3 bits of
47  * the "low byte" encode in base-2 the decimal portion.
88 		err = i2c_smbus_read_byte_data(data->client, SBTSI_REG_CONFIG);  in sbtsi_read()
92 		mutex_lock(&data->lock);  in sbtsi_read()
94 			temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_DEC);  in sbtsi_read()
95 			temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_INT);  in sbtsi_read()
97 			temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_INT);  in sbtsi_read()
98 			temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_DEC);  in sbtsi_read()
100 		mutex_unlock(&data->lock);  in sbtsi_read()
103 		mutex_lock(&data->lock);  in sbtsi_read()
104 		temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_HIGH_INT);  in sbtsi_read()
105 		temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_HIGH_DEC);  in sbtsi_read()
106 		mutex_unlock(&data->lock);  in sbtsi_read()
109 		mutex_lock(&data->lock);  in sbtsi_read()
110 		temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_LOW_INT);  in sbtsi_read()
111 		temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_LOW_DEC);  in sbtsi_read()
112 		mutex_unlock(&data->lock);  in sbtsi_read()
115 		return -EINVAL;  in sbtsi_read()
146 		return -EINVAL;  in sbtsi_write()
152 	mutex_lock(&data->lock);  in sbtsi_write()
153 	err = i2c_smbus_write_byte_data(data->client, reg_int, temp_int);  in sbtsi_write()
157 	err = i2c_smbus_write_byte_data(data->client, reg_dec, temp_dec);  in sbtsi_write()
159 	mutex_unlock(&data->lock);  in sbtsi_write()
203 	struct device *dev = &client->dev;  in sbtsi_probe()
209 		return -ENOMEM;  in sbtsi_probe()
211 	data->client = client;  in sbtsi_probe()
212 	mutex_init(&data->lock);  in sbtsi_probe()
214 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &sbtsi_chip_info,  in sbtsi_probe()
246 MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor");