490 lines
12 KiB
C
490 lines
12 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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//
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// Copyright (c) 2018 Mellanox Technologies. All rights reserved.
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// Copyright (c) 2018 Vadim Pasternak <vadimp@mellanox.com>
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/module.h>
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#include <linux/platform_data/mlxreg.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/thermal.h>
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#define MLXREG_FAN_MAX_TACHO 12
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#define MLXREG_FAN_MAX_STATE 10
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#define MLXREG_FAN_MIN_DUTY 51 /* 20% */
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#define MLXREG_FAN_MAX_DUTY 255 /* 100% */
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/*
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* Minimum and maximum FAN allowed speed in percent: from 20% to 100%. Values
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* MLXREG_FAN_MAX_STATE + x, where x is between 2 and 10 are used for
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* setting FAN speed dynamic minimum. For example, if value is set to 14 (40%)
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* cooling levels vector will be set to 4, 4, 4, 4, 4, 5, 6, 7, 8, 9, 10 to
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* introduce PWM speed in percent: 40, 40, 40, 40, 40, 50, 60. 70, 80, 90, 100.
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*/
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#define MLXREG_FAN_SPEED_MIN (MLXREG_FAN_MAX_STATE + 2)
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#define MLXREG_FAN_SPEED_MAX (MLXREG_FAN_MAX_STATE * 2)
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#define MLXREG_FAN_SPEED_MIN_LEVEL 2 /* 20 percent */
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#define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF 44
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#define MLXREG_FAN_TACHO_DIVIDER_DEF 1132
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/*
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* FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high.
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* The logic in a programmable device measures the time t-high by sampling the
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* tachometer every t-sample (with the default value 11.32 uS) and increment
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* a counter (N) as long as the pulse has not change:
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* RPM = 15 / (t-sample * (K + Regval)), where:
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* Regval: is the value read from the programmable device register;
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* - 0xff - represents tachometer fault;
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* - 0xfe - represents tachometer minimum value , which is 4444 RPM;
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* - 0x00 - represents tachometer maximum value , which is 300000 RPM;
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* K: is 44 and it represents the minimum allowed samples per pulse;
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* N: is equal K + Regval;
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* In order to calculate RPM from the register value the following formula is
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* used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in the
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* default case is modified to:
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* RPM = 15000000 * 100 / ((Regval + 44) * 1132);
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* - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115;
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* - for Regval 0xfe, RPM will be 15000000 * 100 / ((254 + 44) * 1132) = 4446;
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* In common case the formula is modified to:
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* RPM = 15000000 * 100 / ((Regval + samples) * divider).
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*/
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#define MLXREG_FAN_GET_RPM(rval, d, s) (DIV_ROUND_CLOSEST(15000000 * 100, \
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((rval) + (s)) * (d)))
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#define MLXREG_FAN_GET_FAULT(val, mask) ((val) == (mask))
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#define MLXREG_FAN_PWM_DUTY2STATE(duty) (DIV_ROUND_CLOSEST((duty) * \
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MLXREG_FAN_MAX_STATE, \
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MLXREG_FAN_MAX_DUTY))
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#define MLXREG_FAN_PWM_STATE2DUTY(stat) (DIV_ROUND_CLOSEST((stat) * \
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MLXREG_FAN_MAX_DUTY, \
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MLXREG_FAN_MAX_STATE))
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/*
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* struct mlxreg_fan_tacho - tachometer data (internal use):
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*
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* @connected: indicates if tachometer is connected;
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* @reg: register offset;
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* @mask: fault mask;
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*/
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struct mlxreg_fan_tacho {
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bool connected;
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u32 reg;
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u32 mask;
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};
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/*
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* struct mlxreg_fan_pwm - PWM data (internal use):
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*
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* @connected: indicates if PWM is connected;
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* @reg: register offset;
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*/
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struct mlxreg_fan_pwm {
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bool connected;
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u32 reg;
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};
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/*
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* struct mlxreg_fan - private data (internal use):
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*
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* @dev: basic device;
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* @regmap: register map of parent device;
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* @tacho: tachometer data;
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* @pwm: PWM data;
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* @samples: minimum allowed samples per pulse;
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* @divider: divider value for tachometer RPM calculation;
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* @cooling: cooling device levels;
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* @cdev: cooling device;
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*/
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struct mlxreg_fan {
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struct device *dev;
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void *regmap;
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struct mlxreg_core_platform_data *pdata;
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struct mlxreg_fan_tacho tacho[MLXREG_FAN_MAX_TACHO];
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struct mlxreg_fan_pwm pwm;
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int samples;
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int divider;
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u8 cooling_levels[MLXREG_FAN_MAX_STATE + 1];
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struct thermal_cooling_device *cdev;
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};
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static int
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mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct mlxreg_fan *fan = dev_get_drvdata(dev);
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struct mlxreg_fan_tacho *tacho;
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u32 regval;
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int err;
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switch (type) {
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case hwmon_fan:
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tacho = &fan->tacho[channel];
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switch (attr) {
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case hwmon_fan_input:
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err = regmap_read(fan->regmap, tacho->reg, ®val);
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if (err)
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return err;
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*val = MLXREG_FAN_GET_RPM(regval, fan->divider,
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fan->samples);
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break;
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case hwmon_fan_fault:
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err = regmap_read(fan->regmap, tacho->reg, ®val);
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if (err)
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return err;
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*val = MLXREG_FAN_GET_FAULT(regval, tacho->mask);
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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err = regmap_read(fan->regmap, fan->pwm.reg, ®val);
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if (err)
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return err;
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*val = regval;
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int
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mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long val)
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{
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struct mlxreg_fan *fan = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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if (val < MLXREG_FAN_MIN_DUTY ||
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val > MLXREG_FAN_MAX_DUTY)
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return -EINVAL;
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return regmap_write(fan->regmap, fan->pwm.reg, val);
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return -EOPNOTSUPP;
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}
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static umode_t
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mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
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int channel)
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{
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switch (type) {
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case hwmon_fan:
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if (!(((struct mlxreg_fan *)data)->tacho[channel].connected))
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return 0;
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switch (attr) {
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case hwmon_fan_input:
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case hwmon_fan_fault:
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return 0444;
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default:
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break;
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}
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break;
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case hwmon_pwm:
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if (!(((struct mlxreg_fan *)data)->pwm.connected))
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return 0;
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switch (attr) {
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case hwmon_pwm_input:
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return 0644;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static const u32 mlxreg_fan_hwmon_fan_config[] = {
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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0
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};
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static const struct hwmon_channel_info mlxreg_fan_hwmon_fan = {
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.type = hwmon_fan,
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.config = mlxreg_fan_hwmon_fan_config,
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};
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static const u32 mlxreg_fan_hwmon_pwm_config[] = {
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HWMON_PWM_INPUT,
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0
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};
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static const struct hwmon_channel_info mlxreg_fan_hwmon_pwm = {
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.type = hwmon_pwm,
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.config = mlxreg_fan_hwmon_pwm_config,
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};
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static const struct hwmon_channel_info *mlxreg_fan_hwmon_info[] = {
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&mlxreg_fan_hwmon_fan,
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&mlxreg_fan_hwmon_pwm,
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NULL
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};
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static const struct hwmon_ops mlxreg_fan_hwmon_hwmon_ops = {
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.is_visible = mlxreg_fan_is_visible,
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.read = mlxreg_fan_read,
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.write = mlxreg_fan_write,
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};
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static const struct hwmon_chip_info mlxreg_fan_hwmon_chip_info = {
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.ops = &mlxreg_fan_hwmon_hwmon_ops,
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.info = mlxreg_fan_hwmon_info,
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};
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static int mlxreg_fan_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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*state = MLXREG_FAN_MAX_STATE;
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return 0;
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}
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static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct mlxreg_fan *fan = cdev->devdata;
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u32 regval;
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int err;
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err = regmap_read(fan->regmap, fan->pwm.reg, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query PWM duty\n");
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return err;
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}
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*state = MLXREG_FAN_PWM_DUTY2STATE(regval);
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return 0;
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}
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static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct mlxreg_fan *fan = cdev->devdata;
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unsigned long cur_state;
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u32 regval;
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int i;
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int err;
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/*
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* Verify if this request is for changing allowed FAN dynamical
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* minimum. If it is - update cooling levels accordingly and update
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* state, if current state is below the newly requested minimum state.
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* For example, if current state is 5, and minimal state is to be
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* changed from 4 to 6, fan->cooling_levels[0 to 5] will be changed all
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* from 4 to 6. And state 5 (fan->cooling_levels[4]) should be
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* overwritten.
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*/
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if (state >= MLXREG_FAN_SPEED_MIN && state <= MLXREG_FAN_SPEED_MAX) {
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state -= MLXREG_FAN_MAX_STATE;
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for (i = 0; i < state; i++)
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fan->cooling_levels[i] = state;
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for (i = state; i <= MLXREG_FAN_MAX_STATE; i++)
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fan->cooling_levels[i] = i;
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err = regmap_read(fan->regmap, fan->pwm.reg, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query PWM duty\n");
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return err;
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}
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cur_state = MLXREG_FAN_PWM_DUTY2STATE(regval);
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if (state < cur_state)
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return 0;
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state = cur_state;
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}
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if (state > MLXREG_FAN_MAX_STATE)
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return -EINVAL;
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/* Normalize the state to the valid speed range. */
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state = fan->cooling_levels[state];
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err = regmap_write(fan->regmap, fan->pwm.reg,
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MLXREG_FAN_PWM_STATE2DUTY(state));
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if (err) {
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dev_err(fan->dev, "Failed to write PWM duty\n");
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return err;
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}
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return 0;
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}
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static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = {
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.get_max_state = mlxreg_fan_get_max_state,
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.get_cur_state = mlxreg_fan_get_cur_state,
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.set_cur_state = mlxreg_fan_set_cur_state,
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};
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static int mlxreg_fan_config(struct mlxreg_fan *fan,
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struct mlxreg_core_platform_data *pdata)
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{
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struct mlxreg_core_data *data = pdata->data;
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bool configured = false;
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int tacho_num = 0, i;
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fan->samples = MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF;
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fan->divider = MLXREG_FAN_TACHO_DIVIDER_DEF;
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for (i = 0; i < pdata->counter; i++, data++) {
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if (strnstr(data->label, "tacho", sizeof(data->label))) {
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if (tacho_num == MLXREG_FAN_MAX_TACHO) {
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dev_err(fan->dev, "too many tacho entries: %s\n",
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data->label);
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return -EINVAL;
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}
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fan->tacho[tacho_num].reg = data->reg;
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fan->tacho[tacho_num].mask = data->mask;
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fan->tacho[tacho_num++].connected = true;
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} else if (strnstr(data->label, "pwm", sizeof(data->label))) {
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if (fan->pwm.connected) {
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dev_err(fan->dev, "duplicate pwm entry: %s\n",
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data->label);
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return -EINVAL;
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}
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fan->pwm.reg = data->reg;
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fan->pwm.connected = true;
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} else if (strnstr(data->label, "conf", sizeof(data->label))) {
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if (configured) {
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dev_err(fan->dev, "duplicate conf entry: %s\n",
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data->label);
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return -EINVAL;
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}
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/* Validate that conf parameters are not zeros. */
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if (!data->mask || !data->bit) {
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dev_err(fan->dev, "invalid conf entry params: %s\n",
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data->label);
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return -EINVAL;
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}
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fan->samples = data->mask;
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fan->divider = data->bit;
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configured = true;
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} else {
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dev_err(fan->dev, "invalid label: %s\n", data->label);
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return -EINVAL;
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}
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}
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/* Init cooling levels per PWM state. */
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for (i = 0; i < MLXREG_FAN_SPEED_MIN_LEVEL; i++)
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fan->cooling_levels[i] = MLXREG_FAN_SPEED_MIN_LEVEL;
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for (i = MLXREG_FAN_SPEED_MIN_LEVEL; i <= MLXREG_FAN_MAX_STATE; i++)
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fan->cooling_levels[i] = i;
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return 0;
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}
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static int mlxreg_fan_probe(struct platform_device *pdev)
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{
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struct mlxreg_core_platform_data *pdata;
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struct mlxreg_fan *fan;
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struct device *hwm;
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int err;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "Failed to get platform data.\n");
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return -EINVAL;
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}
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fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
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if (!fan)
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return -ENOMEM;
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fan->dev = &pdev->dev;
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fan->regmap = pdata->regmap;
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platform_set_drvdata(pdev, fan);
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err = mlxreg_fan_config(fan, pdata);
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if (err)
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return err;
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hwm = devm_hwmon_device_register_with_info(&pdev->dev, "mlxreg_fan",
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fan,
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&mlxreg_fan_hwmon_chip_info,
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NULL);
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if (IS_ERR(hwm)) {
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dev_err(&pdev->dev, "Failed to register hwmon device\n");
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return PTR_ERR(hwm);
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}
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if (IS_REACHABLE(CONFIG_THERMAL)) {
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fan->cdev = thermal_cooling_device_register("mlxreg_fan", fan,
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&mlxreg_fan_cooling_ops);
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if (IS_ERR(fan->cdev)) {
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dev_err(&pdev->dev, "Failed to register cooling device\n");
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return PTR_ERR(fan->cdev);
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}
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}
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return 0;
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}
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static int mlxreg_fan_remove(struct platform_device *pdev)
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{
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struct mlxreg_fan *fan = platform_get_drvdata(pdev);
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if (IS_REACHABLE(CONFIG_THERMAL))
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thermal_cooling_device_unregister(fan->cdev);
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return 0;
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}
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static struct platform_driver mlxreg_fan_driver = {
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.driver = {
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.name = "mlxreg-fan",
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},
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.probe = mlxreg_fan_probe,
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.remove = mlxreg_fan_remove,
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};
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module_platform_driver(mlxreg_fan_driver);
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MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
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MODULE_DESCRIPTION("Mellanox FAN driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mlxreg-fan");
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