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523 lines
13 KiB
523 lines
13 KiB
// 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 <[email protected]> |
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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_DIV_MIN 283 |
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#define MLXREG_FAN_TACHO_DIV_DEF (MLXREG_FAN_TACHO_DIV_MIN * 4) |
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#define MLXREG_FAN_TACHO_DIV_SCALE_MAX 64 |
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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 struct hwmon_channel_info *mlxreg_fan_hwmon_info[] = { |
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HWMON_CHANNEL_INFO(fan, |
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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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HWMON_CHANNEL_INFO(pwm, |
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HWMON_PWM_INPUT), |
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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_connect_verify(struct mlxreg_fan *fan, |
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struct mlxreg_core_data *data) |
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{ |
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u32 regval; |
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int err; |
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err = regmap_read(fan->regmap, data->capability, ®val); |
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if (err) { |
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dev_err(fan->dev, "Failed to query capability register 0x%08x\n", |
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data->capability); |
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return err; |
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} |
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return !!(regval & data->bit); |
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} |
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static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan, |
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struct mlxreg_core_data *data) |
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{ |
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u32 regval; |
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int err; |
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err = regmap_read(fan->regmap, data->capability, ®val); |
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if (err) { |
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dev_err(fan->dev, "Failed to query capability register 0x%08x\n", |
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data->capability); |
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return err; |
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} |
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/* |
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* Set divider value according to the capability register, in case it |
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* contains valid value. Otherwise use default value. The purpose of |
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* this validation is to protect against the old hardware, in which |
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* this register can return zero. |
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*/ |
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if (regval > 0 && regval <= MLXREG_FAN_TACHO_DIV_SCALE_MAX) |
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fan->divider = regval * MLXREG_FAN_TACHO_DIV_MIN; |
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return 0; |
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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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int err; |
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fan->samples = MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF; |
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fan->divider = MLXREG_FAN_TACHO_DIV_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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if (data->capability) { |
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err = mlxreg_fan_connect_verify(fan, data); |
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if (err < 0) |
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return err; |
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else if (!err) { |
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tacho_num++; |
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continue; |
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} |
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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 && !data->capability) { |
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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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if (data->capability) { |
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err = mlxreg_fan_speed_divider_get(fan, data); |
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if (err) |
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return err; |
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} else { |
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if (data->mask) |
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fan->samples = data->mask; |
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if (data->bit) |
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fan->divider = data->bit; |
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} |
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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 device *dev = &pdev->dev; |
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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(dev); |
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if (!pdata) { |
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dev_err(dev, "Failed to get platform data.\n"); |
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return -EINVAL; |
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} |
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fan = devm_kzalloc(dev, sizeof(*fan), GFP_KERNEL); |
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if (!fan) |
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return -ENOMEM; |
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fan->dev = dev; |
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fan->regmap = pdata->regmap; |
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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(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(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 = devm_thermal_of_cooling_device_register(dev, |
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NULL, "mlxreg_fan", fan, &mlxreg_fan_cooling_ops); |
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if (IS_ERR(fan->cdev)) { |
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dev_err(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 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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}; |
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module_platform_driver(mlxreg_fan_driver); |
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MODULE_AUTHOR("Vadim Pasternak <[email protected]>"); |
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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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