1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * lm80.c - From lm_sensors, Linux kernel modules for hardware
17 #include <linux/hwmon-sysfs.h>
73 #define FAN_FROM_REG(val, div)	((val) == 0 ? -1 : \
77 #define TEMP_TO_REG(temp)	(DIV_ROUND_CLOSEST(clamp_val((temp), \  argument
78 					-128000, 127000), 1000) << 8)
126 	s16 temp[t_num_temp];	/* Register values, normalized to 16 bit */  member
145 	 * This sets fan-divs to 2, among others. This makes most other  in lm80_init_client()
149 	/* Set 11-bit temperature resolution */  in lm80_init_client()
159 	struct i2c_client *client = data->client;  in lm80_update_device()
165 	mutex_lock(&data->update_lock);  in lm80_update_device()
167 	if (data->error)  in lm80_update_device()
170 	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {  in lm80_update_device()
176 			data->in[i_input][i] = rv;  in lm80_update_device()
181 			data->in[i_min][i] = rv;  in lm80_update_device()
186 			data->in[i_max][i] = rv;  in lm80_update_device()
192 		data->fan[f_input][0] = rv;  in lm80_update_device()
197 		data->fan[f_min][0] = rv;  in lm80_update_device()
202 		data->fan[f_input][1] = rv;  in lm80_update_device()
207 		data->fan[f_min][1] = rv;  in lm80_update_device()
215 		data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0);  in lm80_update_device()
221 			data->temp[i] = rv << 8;  in lm80_update_device()
227 		data->fan_div[0] = (rv >> 2) & 0x03;  in lm80_update_device()
228 		data->fan_div[1] = (rv >> 4) & 0x03;  in lm80_update_device()
236 		data->alarms = prev_rv + (rv << 8);  in lm80_update_device()
238 		data->last_updated = jiffies;  in lm80_update_device()
239 		data->valid = true;  in lm80_update_device()
240 		data->error = 0;  in lm80_update_device()
246 	data->valid = false;  in lm80_update_device()
247 	data->error = 1;  in lm80_update_device()
250 	mutex_unlock(&data->update_lock);  in lm80_update_device()
263 	int index = to_sensor_dev_attr_2(attr)->index;  in in_show()
264 	int nr = to_sensor_dev_attr_2(attr)->nr;  in in_show()
268 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index]));  in in_show()
275 	struct i2c_client *client = data->client;  in in_store()
276 	int index = to_sensor_dev_attr_2(attr)->index;  in in_store()
277 	int nr = to_sensor_dev_attr_2(attr)->nr;  in in_store()
286 	mutex_lock(&data->update_lock);  in in_store()
287 	data->in[nr][index] = IN_TO_REG(val);  in in_store()
288 	lm80_write_value(client, reg, data->in[nr][index]);  in in_store()
289 	mutex_unlock(&data->update_lock);  in in_store()
296 	int index = to_sensor_dev_attr_2(attr)->index;  in fan_show()
297 	int nr = to_sensor_dev_attr_2(attr)->nr;  in fan_show()
301 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr][index],  in fan_show()
302 		       DIV_FROM_REG(data->fan_div[index])));  in fan_show()
308 	int nr = to_sensor_dev_attr(attr)->index;  in fan_div_show()
312 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));  in fan_div_show()
318 	int index = to_sensor_dev_attr_2(attr)->index;  in fan_store()
319 	int nr = to_sensor_dev_attr_2(attr)->nr;  in fan_store()
321 	struct i2c_client *client = data->client;  in fan_store()
327 	mutex_lock(&data->update_lock);  in fan_store()
328 	data->fan[nr][index] = FAN_TO_REG(val,  in fan_store()
329 					  DIV_FROM_REG(data->fan_div[index]));  in fan_store()
331 			 data->fan[nr][index]);  in fan_store()
332 	mutex_unlock(&data->update_lock);  in fan_store()
346 	int nr = to_sensor_dev_attr(attr)->index;  in fan_div_store()
348 	struct i2c_client *client = data->client;  in fan_div_store()
358 	mutex_lock(&data->update_lock);  in fan_div_store()
359 	min = FAN_FROM_REG(data->fan[f_min][nr],  in fan_div_store()
360 			   DIV_FROM_REG(data->fan_div[nr]));  in fan_div_store()
364 		data->fan_div[nr] = 0;  in fan_div_store()
367 		data->fan_div[nr] = 1;  in fan_div_store()
370 		data->fan_div[nr] = 2;  in fan_div_store()
373 		data->fan_div[nr] = 3;  in fan_div_store()
379 		mutex_unlock(&data->update_lock);  in fan_div_store()
380 		return -EINVAL;  in fan_div_store()
385 		mutex_unlock(&data->update_lock);  in fan_div_store()
389 	    | (data->fan_div[nr] << (2 * (nr + 1)));  in fan_div_store()
393 	data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));  in fan_div_store()
395 			 data->fan[f_min][nr]);  in fan_div_store()
396 	mutex_unlock(&data->update_lock);  in fan_div_store()
408 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));  in temp_show()
417 	struct i2c_client *client = data->client;  in temp_store()
418 	int nr = attr->index;  in temp_store()
424 	mutex_lock(&data->update_lock);  in temp_store()
425 	data->temp[nr] = TEMP_TO_REG(val);  in temp_store()
426 	lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8);  in temp_store()
427 	mutex_unlock(&data->update_lock);  in temp_store()
437 	return sprintf(buf, "%u\n", data->alarms);  in alarms_show()
443 	int bitnr = to_sensor_dev_attr(attr)->index;  in alarm_show()
447 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);  in alarm_show()
477 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
478 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_hot_max);
479 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, t_hot_hyst);
480 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_os_max);
481 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp, t_os_hyst);
483 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
484 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
485 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
486 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
487 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 4);
488 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 5);
489 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
490 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 10);
491 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 11);
492 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 8);
493 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 13);
548 /* Return 0 if detection is successful, -ENODEV otherwise */
551 	struct i2c_adapter *adapter = client->adapter;  in lm80_detect()
556 		return -ENODEV;  in lm80_detect()
561 		return -ENODEV;  in lm80_detect()
573 			return -ENODEV;  in lm80_detect()
577 		/* Check 6-bit addressing */  in lm80_detect()
583 				return -ENODEV;  in lm80_detect()
589 	strscpy(info->type, name, I2C_NAME_SIZE);  in lm80_detect()
596 	struct device *dev = &client->dev;  in lm80_probe()
602 		return -ENOMEM;  in lm80_probe()
604 	data->client = client;  in lm80_probe()
605 	mutex_init(&data->update_lock);  in lm80_probe()
611 	data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));  in lm80_probe()
612 	data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));  in lm80_probe()
614 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in lm80_probe()