drivers/hwmon/lochnagar-hwmon.c

1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) 2016-2019 Cirrus Logic, Inc. and
13 #include <linux/hwmon-sysfs.h>
38 	"MICVDD",
57  * float_to_long - Convert ieee754 reading from hardware to an integer
66  * will convert that into an integer in a smaller unit such as micro-amps
67  * or milli-celsius. The hardware does not return NaN, so consideration of
73 	int exp = ((data & 0x7F800000) >> 23) - 127 - 23;  in float_to_long()
79 	if (fls64(man) + exp > (int)sizeof(long) * 8 - 1)  in float_to_long()
82 		result = (man + (1ull << (-exp - 1))) >> -exp;  in float_to_long()
86 	return negative ? -result : result;  in float_to_long()
177 	struct regmap *regmap = priv->regmap;  in read_sensor()
181 	mutex_lock(&priv->sensor_lock);  in read_sensor()
198 	mutex_unlock(&priv->sensor_lock);  in read_sensor()
206 	int nsamples = priv->power_nsamples[chan];  in read_power()
273 			interval = priv->power_nsamples[chan] * LN2_SAMPLE_US;  in lochnagar_read()
277 			return -EOPNOTSUPP;  in lochnagar_read()
280 		return -EOPNOTSUPP;  in lochnagar_read()
295 		return -EOPNOTSUPP;  in lochnagar_read_string()
305 		return -EOPNOTSUPP;  in lochnagar_write()
310 	priv->power_nsamples[chan] = val;  in lochnagar_write()
365 	{ .compatible = "cirrus,lochnagar2-hwmon" },
372 	struct device *dev = &pdev->dev;  in lochnagar_hwmon_probe()
379 		return -ENOMEM;  in lochnagar_hwmon_probe()
381 	mutex_init(&priv->sensor_lock);  in lochnagar_hwmon_probe()
383 	priv->regmap = dev_get_regmap(dev->parent, NULL);  in lochnagar_hwmon_probe()
384 	if (!priv->regmap) {  in lochnagar_hwmon_probe()
386 		return -EINVAL;  in lochnagar_hwmon_probe()
389 	for (i = 0; i < ARRAY_SIZE(priv->power_nsamples); i++)  in lochnagar_hwmon_probe()
390 		priv->power_nsamples[i] = 96;  in lochnagar_hwmon_probe()
401 		.name = "lochnagar-hwmon",