1 // SPDX-License-Identifier: GPL-2.0
3  * ADM1177 Hot Swap Controller and Digital Power Monitor with Soft Start Pin
5  * Copyright 2015-2019 Analog Devices Inc.
14 #include <linux/regulator/consumer.h>
27  * struct adm1177_state - driver instance specific data
29  * @reg			regulator info for the the power supply of the device
36 	struct regulator	*reg;
44 	return i2c_master_recv(st->client, data, num);  in adm1177_read_raw()
49 	return i2c_smbus_write_byte(st->client, cmd);  in adm1177_write_cmd()
58 	val = 0xFFULL * alert_threshold_ua * st->r_sense_uohm;  in adm1177_write_alert_thr()
64 	ret = i2c_smbus_write_byte_data(st->client, ADM1177_REG_ALERT_TH,  in adm1177_write_alert_thr()
69 	st->alert_threshold_ua = alert_threshold_ua;  in adm1177_write_alert_thr()
94 				       4096 * st->r_sense_uohm);  in adm1177_read()
97 			*val = st->alert_threshold_ua;  in adm1177_read()
100 			return -EOPNOTSUPP;  in adm1177_read()
111 		if (st->vrange_high)  in adm1177_read()
119 		return -EOPNOTSUPP;  in adm1177_read()
135 			return -EOPNOTSUPP;  in adm1177_write()
138 		return -EOPNOTSUPP;  in adm1177_write()
158 			if (st->r_sense_uohm)  in adm1177_is_visible()
162 			if (st->r_sense_uohm)  in adm1177_is_visible()
196 	regulator_disable(st->reg);  in adm1177_remove()
201 	struct device *dev = &client->dev;  in adm1177_probe()
209 		return -ENOMEM;  in adm1177_probe()
211 	st->client = client;  in adm1177_probe()
213 	st->reg = devm_regulator_get_optional(&client->dev, "vref");  in adm1177_probe()
214 	if (IS_ERR(st->reg)) {  in adm1177_probe()
215 		if (PTR_ERR(st->reg) == -EPROBE_DEFER)  in adm1177_probe()
216 			return -EPROBE_DEFER;  in adm1177_probe()
218 		st->reg = NULL;  in adm1177_probe()
220 		ret = regulator_enable(st->reg);  in adm1177_probe()
223 		ret = devm_add_action_or_reset(&client->dev, adm1177_remove,  in adm1177_probe()
229 	if (device_property_read_u32(dev, "shunt-resistor-micro-ohms",  in adm1177_probe()
230 				     &st->r_sense_uohm))  in adm1177_probe()
231 		st->r_sense_uohm = 0;  in adm1177_probe()
232 	if (device_property_read_u32(dev, "adi,shutdown-threshold-microamp",  in adm1177_probe()
234 		if (st->r_sense_uohm)  in adm1177_probe()
237 			 * shunt-resistor  in adm1177_probe()
240 						     st->r_sense_uohm);  in adm1177_probe()
244 	st->vrange_high = device_property_read_bool(dev,  in adm1177_probe()
245 						    "adi,vrange-high-enable");  in adm1177_probe()
246 	if (alert_threshold_ua && st->r_sense_uohm)  in adm1177_probe()
251 				    (st->vrange_high ? 0 : ADM1177_CMD_VRANGE));  in adm1177_probe()
256 		devm_hwmon_device_register_with_info(dev, client->name, st,  in adm1177_probe()