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9ad0df1ada
The result of an integer divide by an unsigned is undefined. This causes unexpected results when writing negative values into the limit registers. Maintain the shunt_resistors variables as signed integer to avoid the problem. Also, for simplicity and ease of use, clamp shunt resistor value on writes instead of rejecting bad values. Cc: Andrew F. Davis <afd@ti.com> Acked-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
446 lines
13 KiB
C
446 lines
13 KiB
C
/*
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* INA3221 Triple Current/Voltage Monitor
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*
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* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#define INA3221_DRIVER_NAME "ina3221"
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#define INA3221_CONFIG 0x00
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#define INA3221_SHUNT1 0x01
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#define INA3221_BUS1 0x02
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#define INA3221_SHUNT2 0x03
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#define INA3221_BUS2 0x04
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#define INA3221_SHUNT3 0x05
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#define INA3221_BUS3 0x06
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#define INA3221_CRIT1 0x07
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#define INA3221_WARN1 0x08
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#define INA3221_CRIT2 0x09
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#define INA3221_WARN2 0x0a
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#define INA3221_CRIT3 0x0b
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#define INA3221_WARN3 0x0c
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#define INA3221_MASK_ENABLE 0x0f
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#define INA3221_CONFIG_MODE_SHUNT BIT(1)
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#define INA3221_CONFIG_MODE_BUS BIT(2)
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#define INA3221_CONFIG_MODE_CONTINUOUS BIT(3)
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#define INA3221_RSHUNT_DEFAULT 10000
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enum ina3221_fields {
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/* Configuration */
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F_RST,
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/* Alert Flags */
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F_WF3, F_WF2, F_WF1,
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F_CF3, F_CF2, F_CF1,
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/* sentinel */
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F_MAX_FIELDS
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};
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static const struct reg_field ina3221_reg_fields[] = {
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[F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
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[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
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[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
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[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
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[F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
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[F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
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[F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
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};
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enum ina3221_channels {
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INA3221_CHANNEL1,
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INA3221_CHANNEL2,
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INA3221_CHANNEL3,
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INA3221_NUM_CHANNELS
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};
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static const unsigned int register_channel[] = {
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[INA3221_SHUNT1] = INA3221_CHANNEL1,
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[INA3221_SHUNT2] = INA3221_CHANNEL2,
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[INA3221_SHUNT3] = INA3221_CHANNEL3,
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[INA3221_CRIT1] = INA3221_CHANNEL1,
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[INA3221_CRIT2] = INA3221_CHANNEL2,
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[INA3221_CRIT3] = INA3221_CHANNEL3,
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[INA3221_WARN1] = INA3221_CHANNEL1,
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[INA3221_WARN2] = INA3221_CHANNEL2,
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[INA3221_WARN3] = INA3221_CHANNEL3,
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};
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/**
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* struct ina3221_data - device specific information
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* @regmap: Register map of the device
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* @fields: Register fields of the device
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* @shunt_resistors: Array of resistor values per channel
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*/
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struct ina3221_data {
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struct regmap *regmap;
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struct regmap_field *fields[F_MAX_FIELDS];
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int shunt_resistors[INA3221_NUM_CHANNELS];
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};
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static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
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int *val)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(ina->regmap, reg, ®val);
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if (ret)
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return ret;
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*val = sign_extend32(regval >> 3, 12);
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return 0;
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}
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static ssize_t ina3221_show_bus_voltage(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int reg = sd_attr->index;
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int val, voltage_mv, ret;
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ret = ina3221_read_value(ina, reg, &val);
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if (ret)
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return ret;
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voltage_mv = val * 8;
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return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv);
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}
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static ssize_t ina3221_show_shunt_voltage(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int reg = sd_attr->index;
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int val, voltage_uv, ret;
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ret = ina3221_read_value(ina, reg, &val);
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if (ret)
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return ret;
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voltage_uv = val * 40;
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return snprintf(buf, PAGE_SIZE, "%d\n", voltage_uv);
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}
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static ssize_t ina3221_show_current(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int reg = sd_attr->index;
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unsigned int channel = register_channel[reg];
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int resistance_uo = ina->shunt_resistors[channel];
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int val, current_ma, voltage_nv, ret;
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ret = ina3221_read_value(ina, reg, &val);
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if (ret)
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return ret;
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voltage_nv = val * 40000;
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current_ma = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
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return snprintf(buf, PAGE_SIZE, "%d\n", current_ma);
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}
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static ssize_t ina3221_set_current(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int reg = sd_attr->index;
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unsigned int channel = register_channel[reg];
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int resistance_uo = ina->shunt_resistors[channel];
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int val, current_ma, voltage_uv, ret;
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ret = kstrtoint(buf, 0, ¤t_ma);
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if (ret)
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return ret;
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/* clamp current */
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current_ma = clamp_val(current_ma,
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INT_MIN / resistance_uo,
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INT_MAX / resistance_uo);
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voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000);
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/* clamp voltage */
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voltage_uv = clamp_val(voltage_uv, -163800, 163800);
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/* 1 / 40uV(scale) << 3(register shift) = 5 */
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val = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
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ret = regmap_write(ina->regmap, reg, val);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t ina3221_show_shunt(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int channel = sd_attr->index;
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unsigned int resistance_uo;
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resistance_uo = ina->shunt_resistors[channel];
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return snprintf(buf, PAGE_SIZE, "%d\n", resistance_uo);
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}
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static ssize_t ina3221_set_shunt(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int channel = sd_attr->index;
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int val;
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int ret;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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val = clamp_val(val, 1, INT_MAX);
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ina->shunt_resistors[channel] = val;
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return count;
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}
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static ssize_t ina3221_show_alert(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
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struct ina3221_data *ina = dev_get_drvdata(dev);
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unsigned int field = sd_attr->index;
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unsigned int regval;
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int ret;
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ret = regmap_field_read(ina->fields[field], ®val);
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if (ret)
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return ret;
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return snprintf(buf, PAGE_SIZE, "%d\n", regval);
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}
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/* bus voltage */
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO,
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ina3221_show_bus_voltage, NULL, INA3221_BUS1);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO,
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ina3221_show_bus_voltage, NULL, INA3221_BUS2);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO,
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ina3221_show_bus_voltage, NULL, INA3221_BUS3);
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/* calculated current */
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static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO,
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ina3221_show_current, NULL, INA3221_SHUNT1);
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static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO,
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ina3221_show_current, NULL, INA3221_SHUNT2);
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static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO,
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ina3221_show_current, NULL, INA3221_SHUNT3);
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/* shunt resistance */
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static SENSOR_DEVICE_ATTR(shunt1_resistor, S_IRUGO | S_IWUSR,
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ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1);
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static SENSOR_DEVICE_ATTR(shunt2_resistor, S_IRUGO | S_IWUSR,
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ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2);
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static SENSOR_DEVICE_ATTR(shunt3_resistor, S_IRUGO | S_IWUSR,
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ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3);
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/* critical current */
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static SENSOR_DEVICE_ATTR(curr1_crit, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_CRIT1);
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static SENSOR_DEVICE_ATTR(curr2_crit, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_CRIT2);
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static SENSOR_DEVICE_ATTR(curr3_crit, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_CRIT3);
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/* critical current alert */
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static SENSOR_DEVICE_ATTR(curr1_crit_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_CF1);
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static SENSOR_DEVICE_ATTR(curr2_crit_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_CF2);
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static SENSOR_DEVICE_ATTR(curr3_crit_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_CF3);
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/* warning current */
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static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_WARN1);
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static SENSOR_DEVICE_ATTR(curr2_max, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_WARN2);
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static SENSOR_DEVICE_ATTR(curr3_max, S_IRUGO | S_IWUSR,
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ina3221_show_current, ina3221_set_current, INA3221_WARN3);
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/* warning current alert */
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static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_WF1);
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static SENSOR_DEVICE_ATTR(curr2_max_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_WF2);
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static SENSOR_DEVICE_ATTR(curr3_max_alarm, S_IRUGO,
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ina3221_show_alert, NULL, F_WF3);
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/* shunt voltage */
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO,
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ina3221_show_shunt_voltage, NULL, INA3221_SHUNT1);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO,
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ina3221_show_shunt_voltage, NULL, INA3221_SHUNT2);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO,
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ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3);
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static struct attribute *ina3221_attrs[] = {
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/* channel 1 */
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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&sensor_dev_attr_shunt1_resistor.dev_attr.attr,
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&sensor_dev_attr_curr1_crit.dev_attr.attr,
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&sensor_dev_attr_curr1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_curr1_max.dev_attr.attr,
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&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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/* channel 2 */
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_curr2_input.dev_attr.attr,
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&sensor_dev_attr_shunt2_resistor.dev_attr.attr,
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&sensor_dev_attr_curr2_crit.dev_attr.attr,
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&sensor_dev_attr_curr2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_curr2_max.dev_attr.attr,
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&sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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/* channel 3 */
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_curr3_input.dev_attr.attr,
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&sensor_dev_attr_shunt3_resistor.dev_attr.attr,
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&sensor_dev_attr_curr3_crit.dev_attr.attr,
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&sensor_dev_attr_curr3_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_curr3_max.dev_attr.attr,
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&sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ina3221);
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static const struct regmap_range ina3221_yes_ranges[] = {
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regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3),
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regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE),
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};
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static const struct regmap_access_table ina3221_volatile_table = {
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.yes_ranges = ina3221_yes_ranges,
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.n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges),
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};
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static const struct regmap_config ina3221_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &ina3221_volatile_table,
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};
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static int ina3221_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct ina3221_data *ina;
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struct device *hwmon_dev;
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int i, ret;
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ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL);
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if (!ina)
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return -ENOMEM;
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ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config);
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if (IS_ERR(ina->regmap)) {
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dev_err(dev, "Unable to allocate register map\n");
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return PTR_ERR(ina->regmap);
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}
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for (i = 0; i < F_MAX_FIELDS; i++) {
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ina->fields[i] = devm_regmap_field_alloc(dev,
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ina->regmap,
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ina3221_reg_fields[i]);
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if (IS_ERR(ina->fields[i])) {
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dev_err(dev, "Unable to allocate regmap fields\n");
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return PTR_ERR(ina->fields[i]);
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}
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}
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for (i = 0; i < INA3221_NUM_CHANNELS; i++)
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ina->shunt_resistors[i] = INA3221_RSHUNT_DEFAULT;
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ret = regmap_field_write(ina->fields[F_RST], true);
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if (ret) {
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dev_err(dev, "Unable to reset device\n");
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return ret;
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}
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hwmon_dev = devm_hwmon_device_register_with_groups(dev,
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client->name,
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ina, ina3221_groups);
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if (IS_ERR(hwmon_dev)) {
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dev_err(dev, "Unable to register hwmon device\n");
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return PTR_ERR(hwmon_dev);
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}
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return 0;
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}
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static const struct of_device_id ina3221_of_match_table[] = {
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{ .compatible = "ti,ina3221", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ina3221_of_match_table);
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static const struct i2c_device_id ina3221_ids[] = {
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{ "ina3221", 0 },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(i2c, ina3221_ids);
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static struct i2c_driver ina3221_i2c_driver = {
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.probe = ina3221_probe,
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.driver = {
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.name = INA3221_DRIVER_NAME,
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.of_match_table = ina3221_of_match_table,
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},
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.id_table = ina3221_ids,
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};
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module_i2c_driver(ina3221_i2c_driver);
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
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MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver");
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MODULE_LICENSE("GPL v2");
|