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>
81 	u8 ppr[MAX6639_NUM_CHANNELS];	/* Pulses per rotation 0..3 for 1..4 ppr */
95 	res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);  in max6639_temp_read_input()
110 	res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(channel), &val);  in max6639_temp_read_fault()
125 	res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(channel), &val);  in max6639_temp_read_max()
140 	res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), &val);  in max6639_temp_read_crit()
155 	res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(channel), &val);  in max6639_temp_read_emergency()
170 	res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);  in max6639_get_status()
183 	res = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(channel),  in max6639_temp_set_max()
192 	res = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));  in max6639_temp_set_crit()
201 	res = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));  in max6639_temp_set_emergency()
215 		res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(channel), &val);  in max6639_read_fan()
218 		*fan_val = FAN_FROM_REG(val, data->rpm_range[channel]);  in max6639_read_fan()
224 		*fan_val = !!(val & BIT(1 - channel));  in max6639_read_fan()
227 		*fan_val = data->ppr[channel];  in max6639_read_fan()
230 		return -EOPNOTSUPP;  in max6639_read_fan()
237 	return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr-- << 6);  in max6639_set_ppr()
249 			return -EINVAL;  in max6639_write_fan()
251 		mutex_lock(&data->update_lock);  in max6639_write_fan()
252 		/* Set Fan pulse per revolution */  in max6639_write_fan()
255 			mutex_unlock(&data->update_lock);  in max6639_write_fan()
258 		data->ppr[channel] = val;  in max6639_write_fan()
260 		mutex_unlock(&data->update_lock);  in max6639_write_fan()
263 		return -EOPNOTSUPP;  in max6639_write_fan()
292 		res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(channel), &val);  in max6639_read_pwm()
298 		res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);  in max6639_read_pwm()
307 		return -EOPNOTSUPP;  in max6639_read_pwm()
321 			return -EINVAL;  in max6639_write_pwm()
322 		err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(channel),  in max6639_write_pwm()
330 		mutex_lock(&data->update_lock);  in max6639_write_pwm()
331 		err = regmap_update_bits(data->regmap, MAX6639_REG_FAN_CONFIG3(channel),  in max6639_write_pwm()
334 			mutex_unlock(&data->update_lock);  in max6639_write_pwm()
339 			err = regmap_set_bits(data->regmap, MAX6639_REG_GCONFIG,  in max6639_write_pwm()
342 			err = regmap_clear_bits(data->regmap, MAX6639_REG_GCONFIG,  in max6639_write_pwm()
345 		mutex_unlock(&data->update_lock);  in max6639_write_pwm()
348 		return -EOPNOTSUPP;  in max6639_write_pwm()
389 		*val = !!(status & BIT(3 - channel));  in max6639_read_temp()
395 		*val = !!(status & BIT(7 - channel));  in max6639_read_temp()
401 		*val = !!(status & BIT(5 - channel));  in max6639_read_temp()
404 		return -EOPNOTSUPP;  in max6639_read_temp()
421 		return -EOPNOTSUPP;  in max6639_write_temp()
454 		return -EOPNOTSUPP;  in max6639_read()
469 		return -EOPNOTSUPP;  in max6639_write()
538 	struct device *dev = &client->dev;  in max6639_probe_child_from_dt()
550 		return -EINVAL;  in max6639_probe_child_from_dt()
553 	err = of_property_read_u32(child, "pulses-per-revolution", &val);  in max6639_probe_child_from_dt()
556 			dev_err(dev, "invalid pulses-per-revolution %d of %pOFn\n", val, child);  in max6639_probe_child_from_dt()
557 			return -EINVAL;  in max6639_probe_child_from_dt()
559 		data->ppr[i] = val;  in max6639_probe_child_from_dt()
562 	err = of_property_read_u32(child, "max-rpm", &val);  in max6639_probe_child_from_dt()
564 		data->rpm_range[i] = rpm_range_to_reg(val);  in max6639_probe_child_from_dt()
572 	struct device *dev = &client->dev;  in max6639_init_client()
573 	const struct device_node *np = dev->of_node;  in max6639_init_client()
578 	err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR);  in max6639_init_client()
582 	/* Fans pulse per revolution is 2 by default */  in max6639_init_client()
583 	data->ppr[0] = 2;  in max6639_init_client()
584 	data->ppr[1] = 2;  in max6639_init_client()
587 	data->rpm_range[0] = 1;  in max6639_init_client()
588 	data->rpm_range[1] = 1;  in max6639_init_client()
591 		if (strcmp(child->name, "fan"))  in max6639_init_client()
602 		err = regmap_set_bits(data->regmap, MAX6639_REG_OUTPUT_MASK, BIT(1 - i));  in max6639_init_client()
606 		/* Set Fan pulse per revolution */  in max6639_init_client()
607 		err = max6639_set_ppr(data, i, data->ppr[i]);  in max6639_init_client()
612 		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i),  in max6639_init_client()
613 				   MAX6639_FAN_CONFIG1_PWM | data->rpm_range[i]);  in max6639_init_client()
618 		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);  in max6639_init_client()
626 		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG3(i),  in max6639_init_client()
632 		err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80);  in max6639_init_client()
635 		err = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(i), 90);  in max6639_init_client()
638 		err = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(i), 100);  in max6639_init_client()
643 		err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), 120);  in max6639_init_client()
648 	return regmap_write(data->regmap, MAX6639_REG_GCONFIG,  in max6639_init_client()
654 /* Return 0 if detection is successful, -ENODEV otherwise */
658 	struct i2c_adapter *adapter = client->adapter;  in max6639_detect()
662 		return -ENODEV;  in max6639_detect()
668 		return -ENODEV;  in max6639_detect()
670 	strscpy(info->type, "max6639", I2C_NAME_SIZE);  in max6639_detect()
708 	struct device *dev = &client->dev;  in max6639_probe()
715 		return -ENOMEM;  in max6639_probe()
717 	data->regmap = devm_regmap_init_i2c(client, &max6639_regmap_config);  in max6639_probe()
718 	if (IS_ERR(data->regmap))  in max6639_probe()
720 				     PTR_ERR(data->regmap),  in max6639_probe()
723 	data->reg = devm_regulator_get_optional(dev, "fan");  in max6639_probe()
724 	if (IS_ERR(data->reg)) {  in max6639_probe()
725 		if (PTR_ERR(data->reg) != -ENODEV)  in max6639_probe()
726 			return PTR_ERR(data->reg);  in max6639_probe()
728 		data->reg = NULL;  in max6639_probe()
731 		err = regulator_enable(data->reg);  in max6639_probe()
737 					       data->reg);  in max6639_probe()
744 	mutex_init(&data->update_lock);  in max6639_probe()
751 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,  in max6639_probe()
762 	if (data->reg)  in max6639_suspend()
763 		regulator_disable(data->reg);  in max6639_suspend()
765 	return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,  in max6639_suspend()
774 	if (data->reg) {  in max6639_resume()
775 		ret = regulator_enable(data->reg);  in max6639_resume()
782 	return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,  in max6639_resume()