// SPDX-License-Identifier: GPL-2.0-or-later /* * max6639.c - Support for Maxim MAX6639 * * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller * * Copyright (C) 2010, 2011 Roland Stigge <[email protected]> * * based on the initial MAX6639 support from semptian.net * by He Changqing <[email protected]> */ #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/platform_data/max6639.h> #include <linux/regmap.h> #include <linux/util_macros.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = …; /* The MAX6639 registers, valid channel numbers: 0, 1 */ #define MAX6639_REG_TEMP(ch) … #define MAX6639_REG_STATUS … #define MAX6639_REG_OUTPUT_MASK … #define MAX6639_REG_GCONFIG … #define MAX6639_REG_TEMP_EXT(ch) … #define MAX6639_REG_ALERT_LIMIT(ch) … #define MAX6639_REG_OT_LIMIT(ch) … #define MAX6639_REG_THERM_LIMIT(ch) … #define MAX6639_REG_FAN_CONFIG1(ch) … #define MAX6639_REG_FAN_CONFIG2a(ch) … #define MAX6639_REG_FAN_CONFIG2b(ch) … #define MAX6639_REG_FAN_CONFIG3(ch) … #define MAX6639_REG_FAN_CNT(ch) … #define MAX6639_REG_TARGET_CNT(ch) … #define MAX6639_REG_FAN_PPR(ch) … #define MAX6639_REG_TARGTDUTY(ch) … #define MAX6639_REG_FAN_START_TEMP(ch) … #define MAX6639_REG_DEVID … #define MAX6639_REG_MANUID … #define MAX6639_REG_DEVREV … /* Register bits */ #define MAX6639_GCONFIG_STANDBY … #define MAX6639_GCONFIG_POR … #define MAX6639_GCONFIG_DISABLE_TIMEOUT … #define MAX6639_GCONFIG_CH2_LOCAL … #define MAX6639_GCONFIG_PWM_FREQ_HI … #define MAX6639_FAN_CONFIG1_PWM … #define MAX6639_FAN_CONFIG3_FREQ_MASK … #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED … #define MAX6639_NUM_CHANNELS … static const int rpm_ranges[] = …; /* Supported PWM frequency */ static const unsigned int freq_table[] = …; #define FAN_FROM_REG(val, rpm_range) … #define TEMP_LIMIT_TO_REG(val) … /* * Client data (each client gets its own) */ struct max6639_data { … }; static int max6639_temp_read_input(struct device *dev, int channel, long *temp) { … } static int max6639_temp_read_fault(struct device *dev, int channel, long *fault) { … } static int max6639_temp_read_max(struct device *dev, int channel, long *max) { … } static int max6639_temp_read_crit(struct device *dev, int channel, long *crit) { … } static int max6639_temp_read_emergency(struct device *dev, int channel, long *emerg) { … } static int max6639_get_status(struct device *dev, unsigned int *status) { … } static int max6639_temp_set_max(struct max6639_data *data, int channel, long val) { … } static int max6639_temp_set_crit(struct max6639_data *data, int channel, long val) { … } static int max6639_temp_set_emergency(struct max6639_data *data, int channel, long val) { … } static int max6639_read_fan(struct device *dev, u32 attr, int channel, long *fan_val) { … } static int max6639_set_ppr(struct max6639_data *data, int channel, u8 ppr) { … } static int max6639_write_fan(struct device *dev, u32 attr, int channel, long val) { … } static umode_t max6639_fan_is_visible(const void *_data, u32 attr, int channel) { … } static int max6639_read_pwm(struct device *dev, u32 attr, int channel, long *pwm_val) { … } static int max6639_write_pwm(struct device *dev, u32 attr, int channel, long val) { … } static umode_t max6639_pwm_is_visible(const void *_data, u32 attr, int channel) { … } static int max6639_read_temp(struct device *dev, u32 attr, int channel, long *val) { … } static int max6639_write_temp(struct device *dev, u32 attr, int channel, long val) { … } static umode_t max6639_temp_is_visible(const void *_data, u32 attr, int channel) { … } static int max6639_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int max6639_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static umode_t max6639_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static const struct hwmon_channel_info * const max6639_info[] = …; static const struct hwmon_ops max6639_hwmon_ops = …; static const struct hwmon_chip_info max6639_chip_info = …; /* * returns respective index in rpm_ranges table * 1 by default on invalid range */ static int rpm_range_to_reg(int range) { … } static int max6639_init_client(struct i2c_client *client, struct max6639_data *data) { … } /* Return 0 if detection is successful, -ENODEV otherwise */ static int max6639_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static void max6639_regulator_disable(void *data) { … } static bool max6639_regmap_is_volatile(struct device *dev, unsigned int reg) { … } static const struct regmap_config max6639_regmap_config = …; static int max6639_probe(struct i2c_client *client) { … } static int max6639_suspend(struct device *dev) { … } static int max6639_resume(struct device *dev) { … } static const struct i2c_device_id max6639_id[] = …; MODULE_DEVICE_TABLE(i2c, max6639_id); static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); static const struct of_device_id max6639_of_match[] = …; static struct i2c_driver max6639_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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