linux/drivers/hwmon/g760a.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * g760a - Driver for the Global Mixed-mode Technology Inc. G760A
 *	   fan speed PWM controller chip
 *
 * Copyright (C) 2007  Herbert Valerio Riedel <[email protected]>
 *
 * Complete datasheet is available at GMT's website:
 * http://www.gmt.com.tw/product/datasheet/EDS-760A.pdf
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>

enum g760a_regs { … };

#define G760A_REG_FAN_STA_RPM_OFF …
#define G760A_REG_FAN_STA_RPM_LOW …

/* register data is read (and cached) at most once per second */
#define G760A_UPDATE_INTERVAL …

struct g760a_data { … };

#define G760A_DEFAULT_CLK …
#define G760A_DEFAULT_FAN_DIV …

#define PWM_FROM_CNT(cnt) …
#define PWM_TO_CNT(pwm) …

static inline unsigned int rpm_from_cnt(u8 val, u32 clk, u16 div)
{ … }

/* read/write wrappers */
static int g760a_read_value(struct i2c_client *client, enum g760a_regs reg)
{ … }

static int g760a_write_value(struct i2c_client *client, enum g760a_regs reg,
			     u16 value)
{ … }

/*
 * sysfs attributes
 */

static struct g760a_data *g760a_update_client(struct device *dev)
{ … }

static ssize_t fan1_input_show(struct device *dev,
			       struct device_attribute *da, char *buf)
{ … }

static ssize_t fan1_alarm_show(struct device *dev,
			       struct device_attribute *da, char *buf)
{ … }

static ssize_t pwm1_show(struct device *dev, struct device_attribute *da,
			 char *buf)
{ … }

static ssize_t pwm1_store(struct device *dev, struct device_attribute *da,
			  const char *buf, size_t count)
{ … }

static DEVICE_ATTR_RW(pwm1);
static DEVICE_ATTR_RO(fan1_input);
static DEVICE_ATTR_RO(fan1_alarm);

static struct attribute *g760a_attrs[] = …;

ATTRIBUTE_GROUPS(…);

/*
 * new-style driver model code
 */

static int g760a_probe(struct i2c_client *client)
{ … }

static const struct i2c_device_id g760a_id[] = …;
MODULE_DEVICE_TABLE(i2c, g760a_id);

static struct i2c_driver g760a_driver = …;

module_i2c_driver(…) …;

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