1 // SPDX-License-Identifier: GPL-2.0-or-later
14 #include <linux/hwmon-sysfs.h>
68  * struct ltc2945_data - LTC2945 device data
70  * @shunt_resistor: shunt resistor value in micro ohms (1000 by default)
86 	struct regmap *regmap = data->regmap;  in ltc2945_reg_to_val()
87 	u32 shunt_resistor = data->shunt_resistor;  in ltc2945_reg_to_val()
99 		/* 24-bit power */  in ltc2945_reg_to_val()
102 		/* 12-bit current, voltage */  in ltc2945_reg_to_val()
114 		 * Control register bit 0 selects if voltage at SENSE+/VDD  in ltc2945_reg_to_val()
128 		/* Overflow check: Assuming max 24-bit power, val is at most 53 bits right now. */  in ltc2945_reg_to_val()
131 		 * Overflow check: After division, depending on shunt resistor,  in ltc2945_reg_to_val()
132 		 * val can still be > 32 bits so returning long long makes sense  in ltc2945_reg_to_val()
159 		/* Overflow check: Assuming max 12-bit sense, val is at most 27 bits right now */  in ltc2945_reg_to_val()
164 		return -EINVAL;  in ltc2945_reg_to_val()
173 	struct regmap *regmap = data->regmap;  in ltc2945_val_to_reg()
174 	u32 shunt_resistor = data->shunt_resistor;  in ltc2945_val_to_reg()
188 		 * Control register bit 0 selects if voltage at SENSE+/VDD  in ltc2945_val_to_reg()
198 			/* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */  in ltc2945_val_to_reg()
204 			/* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */  in ltc2945_val_to_reg()
232 		/* Overflow check: Assuming 32-bit val and 32-bit shunt resistor, val is 64bits */  in ltc2945_val_to_reg()
237 		return -EINVAL;  in ltc2945_val_to_reg()
248 	value = ltc2945_reg_to_val(dev, attr->index);  in ltc2945_value_show()
260 	struct regmap *regmap = data->regmap;  in ltc2945_value_store()
261 	u8 reg = attr->index;  in ltc2945_value_store()
298 	struct regmap *regmap = data->regmap;  in ltc2945_history_store()
299 	u8 reg = attr->index;  in ltc2945_history_store()
310 		return -EINVAL;  in ltc2945_history_store()
335 		return -EINVAL;  in ltc2945_history_store()
351 	struct regmap *regmap = data->regmap;  in ltc2945_bool_show()
359 	fault &= attr->index;  in ltc2945_bool_show()
361 		regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);  in ltc2945_bool_show()
391 /* Currents (via sense resistor) */
404 /* Current alarms */
477 	struct device *dev = &client->dev;  in ltc2945_probe()
484 		return -ENOMEM;  in ltc2945_probe()
493 	data->regmap = regmap;  in ltc2945_probe()
494 	if (device_property_read_u32(dev, "shunt-resistor-micro-ohms",  in ltc2945_probe()
495 				     &data->shunt_resistor))  in ltc2945_probe()
496 		data->shunt_resistor = 1000;  in ltc2945_probe()
498 	if (data->shunt_resistor == 0)  in ltc2945_probe()
499 		return -EINVAL;  in ltc2945_probe()
504 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ltc2945_probe()
528 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");