// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for Maxim MAX6620 * * Originally from L. Grunenberg. * (C) 2012 by L. Grunenberg <[email protected]> * * Copyright (c) 2021 Dell Inc. or its subsidiaries. All Rights Reserved. * * based on code written by : * 2007 by Hans J. Koch <[email protected]> * John Morris <[email protected]> * Copyright (c) 2003 Spirent Communications * and Claus Gindhart <[email protected]> * * This module has only been tested with the MAX6620 chip. * * The datasheet was last seen at: * * http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf * */ #include <linux/bits.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/jiffies.h> #include <linux/module.h> #include <linux/slab.h> /* * MAX 6620 registers */ #define MAX6620_REG_CONFIG … #define MAX6620_REG_FAULT … #define MAX6620_REG_CONF_FAN0 … #define MAX6620_REG_CONF_FAN1 … #define MAX6620_REG_CONF_FAN2 … #define MAX6620_REG_CONF_FAN3 … #define MAX6620_REG_DYN_FAN0 … #define MAX6620_REG_DYN_FAN1 … #define MAX6620_REG_DYN_FAN2 … #define MAX6620_REG_DYN_FAN3 … #define MAX6620_REG_TACH0 … #define MAX6620_REG_TACH1 … #define MAX6620_REG_TACH2 … #define MAX6620_REG_TACH3 … #define MAX6620_REG_VOLT0 … #define MAX6620_REG_VOLT1 … #define MAX6620_REG_VOLT2 … #define MAX6620_REG_VOLT3 … #define MAX6620_REG_TAR0 … #define MAX6620_REG_TAR1 … #define MAX6620_REG_TAR2 … #define MAX6620_REG_TAR3 … #define MAX6620_REG_DAC0 … #define MAX6620_REG_DAC1 … #define MAX6620_REG_DAC2 … #define MAX6620_REG_DAC3 … /* * Config register bits */ #define MAX6620_CFG_RUN … #define MAX6620_CFG_POR … #define MAX6620_CFG_TIMEOUT … #define MAX6620_CFG_FULLFAN … #define MAX6620_CFG_OSC … #define MAX6620_CFG_WD_MASK … #define MAX6620_CFG_WD_2 … #define MAX6620_CFG_WD_6 … #define MAX6620_CFG_WD10 … #define MAX6620_CFG_WD … /* * Failure status register bits */ #define MAX6620_FAIL_TACH0 … #define MAX6620_FAIL_TACH1 … #define MAX6620_FAIL_TACH2 … #define MAX6620_FAIL_TACH3 … #define MAX6620_FAIL_MASK0 … #define MAX6620_FAIL_MASK1 … #define MAX6620_FAIL_MASK2 … #define MAX6620_FAIL_MASK3 … #define MAX6620_CLOCK_FREQ … #define MAX6620_PULSE_PER_REV … /* Minimum and maximum values of the FAN-RPM */ #define FAN_RPM_MIN … #define FAN_RPM_MAX … static const u8 config_reg[] = …; static const u8 dyn_reg[] = …; static const u8 tach_reg[] = …; static const u8 target_reg[] = …; /* * Client data (each client gets its own) */ struct max6620_data { … }; static u8 max6620_fan_div_from_reg(u8 val) { … } static u16 max6620_fan_rpm_to_tach(u8 div, int rpm) { … } static int max6620_fan_tach_to_rpm(u8 div, u16 tach) { … } static int max6620_update_device(struct device *dev) { … } static umode_t max6620_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static int max6620_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int max6620_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static const struct hwmon_channel_info * const max6620_info[] = …; static const struct hwmon_ops max6620_hwmon_ops = …; static const struct hwmon_chip_info max6620_chip_info = …; static int max6620_init_client(struct max6620_data *data) { … } static int max6620_probe(struct i2c_client *client) { … } static const struct i2c_device_id max6620_id[] = …; MODULE_DEVICE_TABLE(i2c, max6620_id); static struct i2c_driver max6620_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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