1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for Linear Technology LTC4261 I2C Negative Voltage Hot Swap Controller
9  *  Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
22 #include <linux/hwmon-sysfs.h>
58 	struct i2c_client *client = data->client;  in ltc4261_update_device()
61 	mutex_lock(&data->update_lock);  in ltc4261_update_device()
63 	if (time_after(jiffies, data->last_updated + HZ / 4) || !data->valid) {  in ltc4261_update_device()
66 		/* Read registers -- 0x00 to 0x09 */  in ltc4261_update_device()
67 		for (i = 0; i < ARRAY_SIZE(data->regs); i++) {  in ltc4261_update_device()
76 				data->valid = false;  in ltc4261_update_device()
79 			data->regs[i] = val;  in ltc4261_update_device()
81 		data->last_updated = jiffies;  in ltc4261_update_device()
82 		data->valid = true;  in ltc4261_update_device()
85 	mutex_unlock(&data->update_lock);  in ltc4261_update_device()
94 	val = (data->regs[reg] << 2) + (data->regs[reg + 1] >> 6);  in ltc4261_get_value()
132 	value = ltc4261_get_value(data, attr->index);  in ltc4261_value_show()
146 	fault = data->regs[LTC4261_FAULT] & attr->index;  in ltc4261_bool_show()
148 		i2c_smbus_write_byte_data(data->client, LTC4261_FAULT, ~fault);  in ltc4261_bool_show()
195 	struct i2c_adapter *adapter = client->adapter;  in ltc4261_probe()
196 	struct device *dev = &client->dev;  in ltc4261_probe()
201 		return -ENODEV;  in ltc4261_probe()
205 		return -ENODEV;  in ltc4261_probe()
210 		return -ENOMEM;  in ltc4261_probe()
212 	data->client = client;  in ltc4261_probe()
213 	mutex_init(&data->update_lock);  in ltc4261_probe()
218 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ltc4261_probe()
242 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");