// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) // // Copyright (c) 2018 Mellanox Technologies. All rights reserved. // Copyright (c) 2018 Vadim Pasternak <[email protected]> #include <linux/bitops.h> #include <linux/device.h> #include <linux/hwmon.h> #include <linux/module.h> #include <linux/platform_data/mlxreg.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/thermal.h> #define MLXREG_FAN_MAX_TACHO … #define MLXREG_FAN_MAX_PWM … #define MLXREG_FAN_PWM_NOT_CONNECTED … #define MLXREG_FAN_MAX_STATE … #define MLXREG_FAN_MIN_DUTY … #define MLXREG_FAN_MAX_DUTY … #define MLXREG_FAN_SPEED_MIN_LEVEL … #define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF … #define MLXREG_FAN_TACHO_DIV_MIN … #define MLXREG_FAN_TACHO_DIV_DEF … #define MLXREG_FAN_TACHO_DIV_SCALE_MAX … /* * FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high. * The logic in a programmable device measures the time t-high by sampling the * tachometer every t-sample (with the default value 11.32 uS) and increment * a counter (N) as long as the pulse has not change: * RPM = 15 / (t-sample * (K + Regval)), where: * Regval: is the value read from the programmable device register; * - 0xff - represents tachometer fault; * - 0xfe - represents tachometer minimum value , which is 4444 RPM; * - 0x00 - represents tachometer maximum value , which is 300000 RPM; * K: is 44 and it represents the minimum allowed samples per pulse; * N: is equal K + Regval; * In order to calculate RPM from the register value the following formula is * used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in the * default case is modified to: * RPM = 15000000 * 100 / ((Regval + 44) * 1132); * - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115; * - for Regval 0xfe, RPM will be 15000000 * 100 / ((254 + 44) * 1132) = 4446; * In common case the formula is modified to: * RPM = 15000000 * 100 / ((Regval + samples) * divider). */ #define MLXREG_FAN_GET_RPM(rval, d, s) … #define MLXREG_FAN_GET_FAULT(val, mask) … #define MLXREG_FAN_PWM_DUTY2STATE(duty) … #define MLXREG_FAN_PWM_STATE2DUTY(stat) … struct mlxreg_fan; /* * struct mlxreg_fan_tacho - tachometer data (internal use): * * @connected: indicates if tachometer is connected; * @reg: register offset; * @mask: fault mask; * @prsnt: present register offset; */ struct mlxreg_fan_tacho { … }; /* * struct mlxreg_fan_pwm - PWM data (internal use): * * @fan: private data; * @connected: indicates if PWM is connected; * @reg: register offset; * @cooling: cooling device levels; * @last_hwmon_state: last cooling state set by hwmon subsystem; * @last_thermal_state: last cooling state set by thermal subsystem; * @cdev: cooling device; */ struct mlxreg_fan_pwm { … }; /* * struct mlxreg_fan - private data (internal use): * * @dev: basic device; * @regmap: register map of parent device; * @tacho: tachometer data; * @pwm: PWM data; * @tachos_per_drwr - number of tachometers per drawer; * @samples: minimum allowed samples per pulse; * @divider: divider value for tachometer RPM calculation; */ struct mlxreg_fan { … }; static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state); static int mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static umode_t mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static char *mlxreg_fan_name[] = …; static const struct hwmon_channel_info * const mlxreg_fan_hwmon_info[] = …; static const struct hwmon_ops mlxreg_fan_hwmon_hwmon_ops = …; static const struct hwmon_chip_info mlxreg_fan_hwmon_chip_info = …; static int mlxreg_fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { … } static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) { … } static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) { … } static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = …; static int mlxreg_fan_connect_verify(struct mlxreg_fan *fan, struct mlxreg_core_data *data) { … } static int mlxreg_pwm_connect_verify(struct mlxreg_fan *fan, struct mlxreg_core_data *data) { … } static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan, struct mlxreg_core_data *data) { … } static int mlxreg_fan_config(struct mlxreg_fan *fan, struct mlxreg_core_platform_data *pdata) { … } static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan) { … } static int mlxreg_fan_probe(struct platform_device *pdev) { … } static struct platform_driver mlxreg_fan_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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