drivers/hwmon/max6639.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * max6639.c - Support for Maxim MAX6639
5  * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
19 #include <linux/hwmon-sysfs.h>
83 	u8 temp_therm[2];	/* THERM Temperature, 0..255 C (->_max) */
84 	u8 temp_alert[2];	/* ALERT Temperature, 0..255 C (->_crit) */
85 	u8 temp_ot[2];		/* OT Temperature, 0..255 C (->_emergency) */
88 	u8 ppr;			/* Pulses per rotation 0..3 for 1..4 ppr */
95 	struct i2c_client *client = data->client;  in max6639_update_device()
100 	mutex_lock(&data->update_lock);  in max6639_update_device()
102 	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {  in max6639_update_device()
105 		dev_dbg(&client->dev, "Starting max6639 update\n");  in max6639_update_device()
114 		data->status = status_reg;  in max6639_update_device()
123 			data->fan[i] = res;  in max6639_update_device()
131 			data->temp[i] = res >> 5;  in max6639_update_device()
132 			data->temp_fault[i] = res & 0x01;  in max6639_update_device()
140 			data->temp[i] |= res << 3;  in max6639_update_device()
143 		data->last_updated = jiffies;  in max6639_update_device()
144 		data->valid = 1;  in max6639_update_device()
147 	mutex_unlock(&data->update_lock);  in max6639_update_device()
162 	temp = data->temp[attr->index] * 125;  in temp_input_show()
175 	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);  in temp_fault_show()
184 	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));  in temp_max_show()
193 	struct i2c_client *client = data->client;  in temp_max_store()
201 	mutex_lock(&data->update_lock);  in temp_max_store()
202 	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);  in temp_max_store()
204 				  MAX6639_REG_THERM_LIMIT(attr->index),  in temp_max_store()
205 				  data->temp_therm[attr->index]);  in temp_max_store()
206 	mutex_unlock(&data->update_lock);  in temp_max_store()
216 	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));  in temp_crit_show()
225 	struct i2c_client *client = data->client;  in temp_crit_store()
233 	mutex_lock(&data->update_lock);  in temp_crit_store()
234 	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);  in temp_crit_store()
236 				  MAX6639_REG_ALERT_LIMIT(attr->index),  in temp_crit_store()
237 				  data->temp_alert[attr->index]);  in temp_crit_store()
238 	mutex_unlock(&data->update_lock);  in temp_crit_store()
249 	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));  in temp_emergency_show()
258 	struct i2c_client *client = data->client;  in temp_emergency_store()
266 	mutex_lock(&data->update_lock);  in temp_emergency_store()
267 	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);  in temp_emergency_store()
269 				  MAX6639_REG_OT_LIMIT(attr->index),  in temp_emergency_store()
270 				  data->temp_ot[attr->index]);  in temp_emergency_store()
271 	mutex_unlock(&data->update_lock);  in temp_emergency_store()
281 	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);  in pwm_show()
290 	struct i2c_client *client = data->client;  in pwm_store()
300 	mutex_lock(&data->update_lock);  in pwm_store()
301 	data->pwm[attr->index] = (u8)(val * 120 / 255);  in pwm_store()
303 				  MAX6639_REG_TARGTDUTY(attr->index),  in pwm_store()
304 				  data->pwm[attr->index]);  in pwm_store()
305 	mutex_unlock(&data->update_lock);  in pwm_store()
318 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],  in fan_input_show()
319 		       data->rpm_range));  in fan_input_show()
331 	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));  in alarm_show()
405 		dev_get_platdata(&client->dev);  in max6639_init_client()
416 	/* Fans pulse per revolution is 2 by default */  in max6639_init_client()
417 	if (max6639_info && max6639_info->ppr > 0 &&  in max6639_init_client()
418 			max6639_info->ppr < 5)  in max6639_init_client()
419 		data->ppr = max6639_info->ppr;  in max6639_init_client()
421 		data->ppr = 2;  in max6639_init_client()
422 	data->ppr -= 1;  in max6639_init_client()
425 		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);  in max6639_init_client()
426 	data->rpm_range = rpm_range;  in max6639_init_client()
430 		/* Set Fan pulse per revolution */  in max6639_init_client()
433 				data->ppr << 6);  in max6639_init_client()
445 		if (max6639_info && max6639_info->pwm_polarity == 0)  in max6639_init_client()
465 		data->temp_therm[i] = 80;  in max6639_init_client()
466 		data->temp_alert[i] = 90;  in max6639_init_client()
467 		data->temp_ot[i] = 100;  in max6639_init_client()
470 				data->temp_therm[i]);  in max6639_init_client()
475 				data->temp_alert[i]);  in max6639_init_client()
479 				MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);  in max6639_init_client()
484 		data->pwm[i] = 120;  in max6639_init_client()
486 				MAX6639_REG_TARGTDUTY(i), data->pwm[i]);  in max6639_init_client()
498 /* Return 0 if detection is successful, -ENODEV otherwise */
502 	struct i2c_adapter *adapter = client->adapter;  in max6639_detect()
506 		return -ENODEV;  in max6639_detect()
512 		return -ENODEV;  in max6639_detect()
514 	strlcpy(info->type, "max6639", I2C_NAME_SIZE);  in max6639_detect()
521 	struct device *dev = &client->dev;  in max6639_probe()
528 		return -ENOMEM;  in max6639_probe()
530 	data->client = client;  in max6639_probe()
531 	mutex_init(&data->update_lock);  in max6639_probe()
538 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in max6639_probe()