linux/drivers/hwmon/lochnagar-hwmon.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Lochnagar hardware monitoring features
 *
 * Copyright (c) 2016-2019 Cirrus Logic, Inc. and
 *                         Cirrus Logic International Semiconductor Ltd.
 *
 * Author: Lucas Tanure <[email protected]>
 */

#include <linux/delay.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/math64.h>
#include <linux/mfd/lochnagar.h>
#include <linux/mfd/lochnagar2_regs.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define LN2_MAX_NSAMPLE …
#define LN2_SAMPLE_US …

#define LN2_CURR_UNITS …
#define LN2_VOLT_UNITS …
#define LN2_TEMP_UNITS …
#define LN2_PWR_UNITS …

static const char * const lochnagar_chan_names[] = …;

struct lochnagar_hwmon { … };

enum lochnagar_measure_mode { … };

/**
 * float_to_long - Convert ieee754 reading from hardware to an integer
 *
 * @data: Value read from the hardware
 * @precision: Units to multiply up to eg. 1000 = milli, 1000000 = micro
 *
 * Return: Converted integer reading
 *
 * Depending on the measurement type the hardware returns an ieee754
 * floating point value in either volts, amps or celsius. This function
 * will convert that into an integer in a smaller unit such as micro-amps
 * or milli-celsius. The hardware does not return NaN, so consideration of
 * that is not required.
 */
static long float_to_long(u32 data, u32 precision)
{ … }

static int do_measurement(struct regmap *regmap, int chan,
			  enum lochnagar_measure_mode mode, int nsamples)
{ … }

static int request_data(struct regmap *regmap, int chan, u32 *data)
{ … }

static int read_sensor(struct device *dev, int chan,
		       enum lochnagar_measure_mode mode, int nsamples,
		       unsigned int precision, long *val)
{ … }

static int read_power(struct device *dev, int chan, long *val)
{ … }

static umode_t lochnagar_is_visible(const void *drvdata,
				    enum hwmon_sensor_types type,
				    u32 attr, int chan)
{ … }

static int lochnagar_read(struct device *dev, enum hwmon_sensor_types type,
			  u32 attr, int chan, long *val)
{ … }

static int lochnagar_read_string(struct device *dev,
				 enum hwmon_sensor_types type, u32 attr,
				 int chan, const char **str)
{ … }

static int lochnagar_write(struct device *dev, enum hwmon_sensor_types type,
			   u32 attr, int chan, long val)
{ … }

static const struct hwmon_ops lochnagar_ops = …;

static const struct hwmon_channel_info * const lochnagar_info[] = …;

static const struct hwmon_chip_info lochnagar_chip_info = …;

static const struct of_device_id lochnagar_of_match[] = …;
MODULE_DEVICE_TABLE(of, lochnagar_of_match);

static int lochnagar_hwmon_probe(struct platform_device *pdev)
{ … }

static struct platform_driver lochnagar_hwmon_driver = …;
module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;