1 // SPDX-License-Identifier: GPL-2.0-only
18 #include <linux/hwmon-sysfs.h>
21 /* Here are names of the chip's registers (a.k.a. commands) */
46 	struct i2c_client *client = data->client;  in ltc4215_update_device()
50 	mutex_lock(&data->update_lock);  in ltc4215_update_device()
53 	if (time_after(jiffies, data->last_updated + HZ / 10) || !data->valid) {  in ltc4215_update_device()
55 		dev_dbg(&client->dev, "Starting ltc4215 update\n");  in ltc4215_update_device()
58 		for (i = 0; i < ARRAY_SIZE(data->regs); i++) {  in ltc4215_update_device()
61 				data->regs[i] = 0;  in ltc4215_update_device()
63 				data->regs[i] = val;  in ltc4215_update_device()
66 		data->last_updated = jiffies;  in ltc4215_update_device()
67 		data->valid = 1;  in ltc4215_update_device()
70 	mutex_unlock(&data->update_lock);  in ltc4215_update_device()
76 static int ltc4215_get_voltage(struct device *dev, u8 reg)  in ltc4215_get_voltage()  argument
79 	const u8 regval = data->regs[reg];  in ltc4215_get_voltage()
82 	switch (reg) {  in ltc4215_get_voltage()
113 	 * The strange looking conversions that follow are fixed-point  in ltc4215_get_current()
128 	const unsigned int voltage = data->regs[LTC4215_SENSE] * 151;  in ltc4215_get_current()
140 	const int voltage = ltc4215_get_voltage(dev, attr->index);  in ltc4215_voltage_show()
170 	const u8 reg = data->regs[LTC4215_STATUS];  in ltc4215_alarm_show()  local
171 	const u32 mask = attr->index;  in ltc4215_alarm_show()
173 	return snprintf(buf, PAGE_SIZE, "%u\n", !!(reg & mask));  in ltc4215_alarm_show()
223 	struct i2c_adapter *adapter = client->adapter;  in ltc4215_probe()
224 	struct device *dev = &client->dev;  in ltc4215_probe()
229 		return -ENODEV;  in ltc4215_probe()
233 		return -ENOMEM;  in ltc4215_probe()
235 	data->client = client;  in ltc4215_probe()
236 	mutex_init(&data->update_lock);  in ltc4215_probe()
241 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ltc4215_probe()