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488 lines
14 KiB
488 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for Linear Technology LTC2945 I2C Power Monitor |
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* |
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* Copyright (c) 2014 Guenter Roeck |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/jiffies.h> |
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#include <linux/regmap.h> |
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/* chip registers */ |
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#define LTC2945_CONTROL 0x00 |
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#define LTC2945_ALERT 0x01 |
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#define LTC2945_STATUS 0x02 |
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#define LTC2945_FAULT 0x03 |
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#define LTC2945_POWER_H 0x05 |
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#define LTC2945_MAX_POWER_H 0x08 |
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#define LTC2945_MIN_POWER_H 0x0b |
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#define LTC2945_MAX_POWER_THRES_H 0x0e |
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#define LTC2945_MIN_POWER_THRES_H 0x11 |
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#define LTC2945_SENSE_H 0x14 |
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#define LTC2945_MAX_SENSE_H 0x16 |
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#define LTC2945_MIN_SENSE_H 0x18 |
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#define LTC2945_MAX_SENSE_THRES_H 0x1a |
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#define LTC2945_MIN_SENSE_THRES_H 0x1c |
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#define LTC2945_VIN_H 0x1e |
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#define LTC2945_MAX_VIN_H 0x20 |
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#define LTC2945_MIN_VIN_H 0x22 |
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#define LTC2945_MAX_VIN_THRES_H 0x24 |
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#define LTC2945_MIN_VIN_THRES_H 0x26 |
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#define LTC2945_ADIN_H 0x28 |
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#define LTC2945_MAX_ADIN_H 0x2a |
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#define LTC2945_MIN_ADIN_H 0x2c |
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#define LTC2945_MAX_ADIN_THRES_H 0x2e |
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#define LTC2945_MIN_ADIN_THRES_H 0x30 |
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#define LTC2945_MIN_ADIN_THRES_L 0x31 |
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/* Fault register bits */ |
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#define FAULT_ADIN_UV (1 << 0) |
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#define FAULT_ADIN_OV (1 << 1) |
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#define FAULT_VIN_UV (1 << 2) |
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#define FAULT_VIN_OV (1 << 3) |
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#define FAULT_SENSE_UV (1 << 4) |
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#define FAULT_SENSE_OV (1 << 5) |
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#define FAULT_POWER_UV (1 << 6) |
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#define FAULT_POWER_OV (1 << 7) |
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/* Control register bits */ |
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#define CONTROL_MULT_SELECT (1 << 0) |
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#define CONTROL_TEST_MODE (1 << 4) |
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static inline bool is_power_reg(u8 reg) |
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{ |
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return reg < LTC2945_SENSE_H; |
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} |
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/* Return the value from the given register in uW, mV, or mA */ |
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static long long ltc2945_reg_to_val(struct device *dev, u8 reg) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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unsigned int control; |
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u8 buf[3]; |
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long long val; |
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int ret; |
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ret = regmap_bulk_read(regmap, reg, buf, |
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is_power_reg(reg) ? 3 : 2); |
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if (ret < 0) |
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return ret; |
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if (is_power_reg(reg)) { |
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/* power */ |
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val = (buf[0] << 16) + (buf[1] << 8) + buf[2]; |
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} else { |
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/* current, voltage */ |
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val = (buf[0] << 4) + (buf[1] >> 4); |
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} |
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switch (reg) { |
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case LTC2945_POWER_H: |
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case LTC2945_MAX_POWER_H: |
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case LTC2945_MIN_POWER_H: |
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case LTC2945_MAX_POWER_THRES_H: |
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case LTC2945_MIN_POWER_THRES_H: |
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/* |
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* Convert to uW by assuming current is measured with |
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* an 1mOhm sense resistor, similar to current |
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* measurements. |
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* Control register bit 0 selects if voltage at SENSE+/VDD |
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* or voltage at ADIN is used to measure power. |
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*/ |
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ret = regmap_read(regmap, LTC2945_CONTROL, &control); |
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if (ret < 0) |
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return ret; |
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if (control & CONTROL_MULT_SELECT) { |
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/* 25 mV * 25 uV = 0.625 uV resolution. */ |
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val *= 625LL; |
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} else { |
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/* 0.5 mV * 25 uV = 0.0125 uV resolution. */ |
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val = (val * 25LL) >> 1; |
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} |
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break; |
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case LTC2945_VIN_H: |
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case LTC2945_MAX_VIN_H: |
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case LTC2945_MIN_VIN_H: |
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case LTC2945_MAX_VIN_THRES_H: |
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case LTC2945_MIN_VIN_THRES_H: |
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/* 25 mV resolution. Convert to mV. */ |
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val *= 25; |
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break; |
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case LTC2945_ADIN_H: |
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case LTC2945_MAX_ADIN_H: |
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case LTC2945_MIN_ADIN_THRES_H: |
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case LTC2945_MAX_ADIN_THRES_H: |
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case LTC2945_MIN_ADIN_H: |
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/* 0.5mV resolution. Convert to mV. */ |
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val = val >> 1; |
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break; |
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case LTC2945_SENSE_H: |
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case LTC2945_MAX_SENSE_H: |
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case LTC2945_MIN_SENSE_H: |
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case LTC2945_MAX_SENSE_THRES_H: |
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case LTC2945_MIN_SENSE_THRES_H: |
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/* |
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* 25 uV resolution. Convert to current as measured with |
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* an 1 mOhm sense resistor, in mA. If a different sense |
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* resistor is installed, calculate the actual current by |
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* dividing the reported current by the sense resistor value |
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* in mOhm. |
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*/ |
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val *= 25; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return val; |
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} |
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static int ltc2945_val_to_reg(struct device *dev, u8 reg, |
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unsigned long val) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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unsigned int control; |
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int ret; |
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switch (reg) { |
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case LTC2945_POWER_H: |
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case LTC2945_MAX_POWER_H: |
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case LTC2945_MIN_POWER_H: |
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case LTC2945_MAX_POWER_THRES_H: |
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case LTC2945_MIN_POWER_THRES_H: |
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/* |
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* Convert to register value by assuming current is measured |
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* with an 1mOhm sense resistor, similar to current |
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* measurements. |
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* Control register bit 0 selects if voltage at SENSE+/VDD |
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* or voltage at ADIN is used to measure power, which in turn |
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* determines register calculations. |
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*/ |
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ret = regmap_read(regmap, LTC2945_CONTROL, &control); |
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if (ret < 0) |
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return ret; |
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if (control & CONTROL_MULT_SELECT) { |
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/* 25 mV * 25 uV = 0.625 uV resolution. */ |
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val = DIV_ROUND_CLOSEST(val, 625); |
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} else { |
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/* |
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* 0.5 mV * 25 uV = 0.0125 uV resolution. |
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* Divide first to avoid overflow; |
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* accept loss of accuracy. |
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*/ |
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val = DIV_ROUND_CLOSEST(val, 25) * 2; |
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} |
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break; |
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case LTC2945_VIN_H: |
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case LTC2945_MAX_VIN_H: |
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case LTC2945_MIN_VIN_H: |
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case LTC2945_MAX_VIN_THRES_H: |
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case LTC2945_MIN_VIN_THRES_H: |
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/* 25 mV resolution. */ |
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val /= 25; |
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break; |
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case LTC2945_ADIN_H: |
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case LTC2945_MAX_ADIN_H: |
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case LTC2945_MIN_ADIN_THRES_H: |
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case LTC2945_MAX_ADIN_THRES_H: |
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case LTC2945_MIN_ADIN_H: |
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/* 0.5mV resolution. */ |
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val *= 2; |
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break; |
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case LTC2945_SENSE_H: |
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case LTC2945_MAX_SENSE_H: |
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case LTC2945_MIN_SENSE_H: |
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case LTC2945_MAX_SENSE_THRES_H: |
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case LTC2945_MIN_SENSE_THRES_H: |
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/* |
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* 25 uV resolution. Convert to current as measured with |
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* an 1 mOhm sense resistor, in mA. If a different sense |
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* resistor is installed, calculate the actual current by |
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* dividing the reported current by the sense resistor value |
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* in mOhm. |
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*/ |
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val = DIV_ROUND_CLOSEST(val, 25); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return val; |
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} |
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static ssize_t ltc2945_value_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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long long value; |
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value = ltc2945_reg_to_val(dev, attr->index); |
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if (value < 0) |
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return value; |
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return sysfs_emit(buf, "%lld\n", value); |
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} |
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static ssize_t ltc2945_value_store(struct device *dev, |
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struct device_attribute *da, |
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const char *buf, size_t count) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct regmap *regmap = dev_get_drvdata(dev); |
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u8 reg = attr->index; |
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unsigned long val; |
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u8 regbuf[3]; |
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int num_regs; |
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int regval; |
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int ret; |
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ret = kstrtoul(buf, 10, &val); |
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if (ret) |
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return ret; |
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/* convert to register value, then clamp and write result */ |
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regval = ltc2945_val_to_reg(dev, reg, val); |
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if (is_power_reg(reg)) { |
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regval = clamp_val(regval, 0, 0xffffff); |
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regbuf[0] = regval >> 16; |
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regbuf[1] = (regval >> 8) & 0xff; |
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regbuf[2] = regval; |
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num_regs = 3; |
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} else { |
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regval = clamp_val(regval, 0, 0xfff) << 4; |
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regbuf[0] = regval >> 8; |
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regbuf[1] = regval & 0xff; |
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num_regs = 2; |
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} |
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ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); |
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return ret < 0 ? ret : count; |
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} |
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static ssize_t ltc2945_history_store(struct device *dev, |
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struct device_attribute *da, |
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const char *buf, size_t count) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct regmap *regmap = dev_get_drvdata(dev); |
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u8 reg = attr->index; |
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int num_regs = is_power_reg(reg) ? 3 : 2; |
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u8 buf_min[3] = { 0xff, 0xff, 0xff }; |
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u8 buf_max[3] = { 0, 0, 0 }; |
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unsigned long val; |
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int ret; |
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ret = kstrtoul(buf, 10, &val); |
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if (ret) |
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return ret; |
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if (val != 1) |
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return -EINVAL; |
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ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, |
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CONTROL_TEST_MODE); |
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/* Reset minimum */ |
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ret = regmap_bulk_write(regmap, reg, buf_min, num_regs); |
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if (ret) |
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return ret; |
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switch (reg) { |
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case LTC2945_MIN_POWER_H: |
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reg = LTC2945_MAX_POWER_H; |
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break; |
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case LTC2945_MIN_SENSE_H: |
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reg = LTC2945_MAX_SENSE_H; |
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break; |
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case LTC2945_MIN_VIN_H: |
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reg = LTC2945_MAX_VIN_H; |
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break; |
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case LTC2945_MIN_ADIN_H: |
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reg = LTC2945_MAX_ADIN_H; |
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break; |
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default: |
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WARN_ONCE(1, "Bad register: 0x%x\n", reg); |
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return -EINVAL; |
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} |
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/* Reset maximum */ |
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ret = regmap_bulk_write(regmap, reg, buf_max, num_regs); |
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/* Try resetting test mode even if there was an error */ |
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regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0); |
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return ret ? : count; |
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} |
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static ssize_t ltc2945_bool_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct regmap *regmap = dev_get_drvdata(dev); |
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unsigned int fault; |
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int ret; |
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ret = regmap_read(regmap, LTC2945_FAULT, &fault); |
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if (ret < 0) |
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return ret; |
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fault &= attr->index; |
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if (fault) /* Clear reported faults in chip register */ |
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regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0); |
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return sysfs_emit(buf, "%d\n", !!fault); |
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} |
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/* Input voltages */ |
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static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H); |
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static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H); |
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static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H); |
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static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H); |
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static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H); |
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static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history, |
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LTC2945_MIN_VIN_H); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H); |
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static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H); |
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static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H); |
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static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H); |
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static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H); |
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static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history, |
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LTC2945_MIN_ADIN_H); |
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/* Voltage alarms */ |
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static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV); |
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static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV); |
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static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV); |
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static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV); |
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/* Currents (via sense resistor) */ |
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static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H); |
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static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value, |
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LTC2945_MIN_SENSE_THRES_H); |
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static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value, |
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LTC2945_MAX_SENSE_THRES_H); |
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static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H); |
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static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value, |
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LTC2945_MAX_SENSE_H); |
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static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history, |
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LTC2945_MIN_SENSE_H); |
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/* Current alarms */ |
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static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV); |
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static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV); |
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/* Power */ |
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static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H); |
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static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value, |
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LTC2945_MIN_POWER_THRES_H); |
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static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value, |
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LTC2945_MAX_POWER_THRES_H); |
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static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value, |
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LTC2945_MIN_POWER_H); |
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static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value, |
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LTC2945_MAX_POWER_H); |
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static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history, |
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LTC2945_MIN_POWER_H); |
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/* Power alarms */ |
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static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV); |
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static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV); |
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|
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static struct attribute *ltc2945_attrs[] = { |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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&sensor_dev_attr_in1_min.dev_attr.attr, |
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&sensor_dev_attr_in1_max.dev_attr.attr, |
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&sensor_dev_attr_in1_lowest.dev_attr.attr, |
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&sensor_dev_attr_in1_highest.dev_attr.attr, |
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&sensor_dev_attr_in1_reset_history.dev_attr.attr, |
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&sensor_dev_attr_in1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_in1_max_alarm.dev_attr.attr, |
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|
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_in2_min.dev_attr.attr, |
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&sensor_dev_attr_in2_max.dev_attr.attr, |
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&sensor_dev_attr_in2_lowest.dev_attr.attr, |
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&sensor_dev_attr_in2_highest.dev_attr.attr, |
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&sensor_dev_attr_in2_reset_history.dev_attr.attr, |
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&sensor_dev_attr_in2_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_in2_max_alarm.dev_attr.attr, |
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|
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&sensor_dev_attr_curr1_input.dev_attr.attr, |
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&sensor_dev_attr_curr1_min.dev_attr.attr, |
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&sensor_dev_attr_curr1_max.dev_attr.attr, |
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&sensor_dev_attr_curr1_lowest.dev_attr.attr, |
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&sensor_dev_attr_curr1_highest.dev_attr.attr, |
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&sensor_dev_attr_curr1_reset_history.dev_attr.attr, |
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&sensor_dev_attr_curr1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_curr1_max_alarm.dev_attr.attr, |
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|
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&sensor_dev_attr_power1_input.dev_attr.attr, |
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&sensor_dev_attr_power1_min.dev_attr.attr, |
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&sensor_dev_attr_power1_max.dev_attr.attr, |
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&sensor_dev_attr_power1_input_lowest.dev_attr.attr, |
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&sensor_dev_attr_power1_input_highest.dev_attr.attr, |
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&sensor_dev_attr_power1_reset_history.dev_attr.attr, |
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&sensor_dev_attr_power1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_power1_max_alarm.dev_attr.attr, |
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|
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(ltc2945); |
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|
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static const struct regmap_config ltc2945_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = LTC2945_MIN_ADIN_THRES_L, |
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}; |
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static int ltc2945_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct regmap *regmap; |
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|
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regmap = devm_regmap_init_i2c(client, <c2945_regmap_config); |
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if (IS_ERR(regmap)) { |
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dev_err(dev, "failed to allocate register map\n"); |
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return PTR_ERR(regmap); |
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} |
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|
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/* Clear faults */ |
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regmap_write(regmap, LTC2945_FAULT, 0x00); |
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|
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
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regmap, |
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ltc2945_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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|
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static const struct i2c_device_id ltc2945_id[] = { |
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{"ltc2945", 0}, |
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{ } |
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}; |
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|
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MODULE_DEVICE_TABLE(i2c, ltc2945_id); |
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|
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static struct i2c_driver ltc2945_driver = { |
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.driver = { |
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.name = "ltc2945", |
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}, |
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.probe_new = ltc2945_probe, |
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.id_table = ltc2945_id, |
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}; |
|
|
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module_i2c_driver(ltc2945_driver); |
|
|
|
MODULE_AUTHOR("Guenter Roeck <[email protected]>"); |
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MODULE_DESCRIPTION("LTC2945 driver"); |
|
MODULE_LICENSE("GPL");
|
|
|