1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
5  * Copyright (C) 2003-2009  Jean Delvare <jdelvare@suse.de>
10  * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
16  * Also supports the LM82 temp sensor, which is basically a stripped down
26 #include <linux/hwmon-sysfs.h>
34  * Address is selected using 2 three-level pins, resulting in 9 possible
71  * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
75 #define TEMP_TO_REG(val)	((val) <= -128000 ? -128 : \
77 				 (val) < 0 ? ((val) - 500) / 1000 : \
112 	s8 temp[9];	/* 0..3: input 1-4,  member
113 			   4..7: high limit 1-4,
121 	struct i2c_client *client = data->client;  in lm83_update_device()
123 	mutex_lock(&data->update_lock);  in lm83_update_device()
125 	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {  in lm83_update_device()
128 		dev_dbg(&client->dev, "Updating lm83 data.\n");  in lm83_update_device()
130 			data->temp[nr] =  in lm83_update_device()
134 		data->alarms =  in lm83_update_device()
139 		data->last_updated = jiffies;  in lm83_update_device()
140 		data->valid = 1;  in lm83_update_device()
143 	mutex_unlock(&data->update_lock);  in lm83_update_device()
157 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));  in temp_show()
166 	struct i2c_client *client = data->client;  in temp_store()
168 	int nr = attr->index;  in temp_store()
175 	mutex_lock(&data->update_lock);  in temp_store()
176 	data->temp[nr] = TEMP_TO_REG(val);  in temp_store()
177 	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],  in temp_store()
178 				  data->temp[nr]);  in temp_store()
179 	mutex_unlock(&data->update_lock);  in temp_store()
187 	return sprintf(buf, "%d\n", data->alarms);  in alarms_show()
195 	int bitnr = attr->index;  in alarm_show()
197 	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);  in alarm_show()
200 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
201 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
202 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
203 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
204 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
205 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
206 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
207 static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
208 static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
209 static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
210 static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
211 static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
213 /* Individual alarm files */
214 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
215 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
216 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
217 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
218 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
219 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
220 static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
221 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
222 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
223 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
224 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
225 /* Raw alarm file for compatibility */
274 /* Return 0 if detection is successful, -ENODEV otherwise */
278 	struct i2c_adapter *adapter = new_client->adapter;  in lm83_detect()
283 		return -ENODEV;  in lm83_detect()
289 		dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",  in lm83_detect()
290 			new_client->addr);  in lm83_detect()
291 		return -ENODEV;  in lm83_detect()
297 		return -ENODEV;  in lm83_detect()
309 		dev_info(&adapter->dev,  in lm83_detect()
312 		return -ENODEV;  in lm83_detect()
315 	strlcpy(info->type, name, I2C_NAME_SIZE);  in lm83_detect()
327 	data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),  in lm83_probe()
330 		return -ENOMEM;  in lm83_probe()
332 	data->client = new_client;  in lm83_probe()
333 	mutex_init(&data->update_lock);  in lm83_probe()
338 	 * at the same register as the LM83 temp3 entry - so we  in lm83_probe()
341 	data->groups[0] = &lm83_group;  in lm83_probe()
342 	if (i2c_match_id(lm83_id, new_client)->driver_data == lm83)  in lm83_probe()
343 		data->groups[1] = &lm83_group_opt;  in lm83_probe()
345 	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,  in lm83_probe()
346 							   new_client->name,  in lm83_probe()
347 							   data, data->groups);  in lm83_probe()