2  * max6639.c - Support for Maxim MAX6639
4  * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
32 #include <linux/hwmon-sysfs.h>
96 	u8 temp_therm[2];	/* THERM Temperature, 0..255 C (->_max) */
97 	u8 temp_alert[2];	/* ALERT Temperature, 0..255 C (->_crit) */
98 	u8 temp_ot[2];		/* OT Temperature, 0..255 C (->_emergency) */
101 	u8 ppr;			/* Pulses per rotation 0..3 for 1..4 ppr */
108 	struct i2c_client *client = data->client;  in max6639_update_device()
113 	mutex_lock(&data->update_lock);  in max6639_update_device()
115 	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {  in max6639_update_device()
118 		dev_dbg(&client->dev, "Starting max6639 update\n");  in max6639_update_device()
127 		data->status = status_reg;  in max6639_update_device()
136 			data->fan[i] = res;  in max6639_update_device()
144 			data->temp[i] = res >> 5;  in max6639_update_device()
145 			data->temp_fault[i] = res & 0x01;  in max6639_update_device()
153 			data->temp[i] |= res << 3;  in max6639_update_device()
156 		data->last_updated = jiffies;  in max6639_update_device()
157 		data->valid = 1;  in max6639_update_device()
160 	mutex_unlock(&data->update_lock);  in max6639_update_device()
175 	temp = data->temp[attr->index] * 125;  in show_temp_input()
188 	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);  in show_temp_fault()
197 	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));  in show_temp_max()
206 	struct i2c_client *client = data->client;  in set_temp_max()
214 	mutex_lock(&data->update_lock);  in set_temp_max()
215 	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);  in set_temp_max()
217 				  MAX6639_REG_THERM_LIMIT(attr->index),  in set_temp_max()
218 				  data->temp_therm[attr->index]);  in set_temp_max()
219 	mutex_unlock(&data->update_lock);  in set_temp_max()
229 	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));  in show_temp_crit()
238 	struct i2c_client *client = data->client;  in set_temp_crit()
246 	mutex_lock(&data->update_lock);  in set_temp_crit()
247 	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);  in set_temp_crit()
249 				  MAX6639_REG_ALERT_LIMIT(attr->index),  in set_temp_crit()
250 				  data->temp_alert[attr->index]);  in set_temp_crit()
251 	mutex_unlock(&data->update_lock);  in set_temp_crit()
262 	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));  in show_temp_emergency()
271 	struct i2c_client *client = data->client;  in set_temp_emergency()
279 	mutex_lock(&data->update_lock);  in set_temp_emergency()
280 	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);  in set_temp_emergency()
282 				  MAX6639_REG_OT_LIMIT(attr->index),  in set_temp_emergency()
283 				  data->temp_ot[attr->index]);  in set_temp_emergency()
284 	mutex_unlock(&data->update_lock);  in set_temp_emergency()
294 	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);  in show_pwm()
303 	struct i2c_client *client = data->client;  in set_pwm()
313 	mutex_lock(&data->update_lock);  in set_pwm()
314 	data->pwm[attr->index] = (u8)(val * 120 / 255);  in set_pwm()
316 				  MAX6639_REG_TARGTDUTY(attr->index),  in set_pwm()
317 				  data->pwm[attr->index]);  in set_pwm()
318 	mutex_unlock(&data->update_lock);  in set_pwm()
331 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],  in show_fan_input()
332 		       data->rpm_range));  in show_fan_input()
344 	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));  in show_alarm()
424 		dev_get_platdata(&client->dev);  in max6639_init_client()
435 	/* Fans pulse per revolution is 2 by default */  in max6639_init_client()
436 	if (max6639_info && max6639_info->ppr > 0 &&  in max6639_init_client()
437 			max6639_info->ppr < 5)  in max6639_init_client()
438 		data->ppr = max6639_info->ppr;  in max6639_init_client()
440 		data->ppr = 2;  in max6639_init_client()
441 	data->ppr -= 1;  in max6639_init_client()
444 		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);  in max6639_init_client()
445 	data->rpm_range = rpm_range;  in max6639_init_client()
449 		/* Set Fan pulse per revolution */  in max6639_init_client()
452 				data->ppr << 6);  in max6639_init_client()
464 		if (max6639_info && max6639_info->pwm_polarity == 0)  in max6639_init_client()
484 		data->temp_therm[i] = 80;  in max6639_init_client()
485 		data->temp_alert[i] = 90;  in max6639_init_client()
486 		data->temp_ot[i] = 100;  in max6639_init_client()
489 				data->temp_therm[i]);  in max6639_init_client()
494 				data->temp_alert[i]);  in max6639_init_client()
498 				MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);  in max6639_init_client()
503 		data->pwm[i] = 120;  in max6639_init_client()
505 				MAX6639_REG_TARGTDUTY(i), data->pwm[i]);  in max6639_init_client()
517 /* Return 0 if detection is successful, -ENODEV otherwise */
521 	struct i2c_adapter *adapter = client->adapter;  in max6639_detect()
525 		return -ENODEV;  in max6639_detect()
531 		return -ENODEV;  in max6639_detect()
533 	strlcpy(info->type, "max6639", I2C_NAME_SIZE);  in max6639_detect()
541 	struct device *dev = &client->dev;  in max6639_probe()
548 		return -ENOMEM;  in max6639_probe()
550 	data->client = client;  in max6639_probe()
551 	mutex_init(&data->update_lock);  in max6639_probe()
558 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in max6639_probe()