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![Nicolin Chen](/assets/img/avatar_default.png)
The hwmon core has a newer API which abstracts most of common things in the core so as to simplify the hwmon device drivers. This patch implements this _info API to ina3221 hwmon driver. It also reduces the binary size: text data bss dec hex filename 5114 1712 0 6826 1aaa drivers/hwmon/ina3221_before.o 4456 440 0 4896 1320 drivers/hwmon/ina3221.o Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
671 lines
17 KiB
C
671 lines
17 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_MASK GENMASK(2, 0)
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#define INA3221_CONFIG_MODE_POWERDOWN 0
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#define INA3221_CONFIG_MODE_SHUNT BIT(0)
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#define INA3221_CONFIG_MODE_BUS BIT(1)
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#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2)
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#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
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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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/**
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* struct ina3221_input - channel input source specific information
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* @label: label of channel input source
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* @shunt_resistor: shunt resistor value of channel input source
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* @disconnected: connection status of channel input source
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*/
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struct ina3221_input {
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const char *label;
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int shunt_resistor;
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bool disconnected;
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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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* @inputs: Array of channel input source specific structures
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* @reg_config: Register value of INA3221_CONFIG
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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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struct ina3221_input inputs[INA3221_NUM_CHANNELS];
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u32 reg_config;
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};
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static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
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{
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return ina->reg_config & INA3221_CONFIG_CHx_EN(channel);
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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 const u8 ina3221_in_reg[] = {
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INA3221_BUS1,
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INA3221_BUS2,
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INA3221_BUS3,
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INA3221_SHUNT1,
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INA3221_SHUNT2,
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INA3221_SHUNT3,
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};
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static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
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{
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const bool is_shunt = channel > INA3221_CHANNEL3;
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struct ina3221_data *ina = dev_get_drvdata(dev);
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u8 reg = ina3221_in_reg[channel];
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int regval, ret;
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/* Translate shunt channel index to sensor channel index */
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channel %= INA3221_NUM_CHANNELS;
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switch (attr) {
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case hwmon_in_input:
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if (!ina3221_is_enabled(ina, channel))
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return -ENODATA;
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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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/*
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* Scale of shunt voltage (uV): LSB is 40uV
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* Scale of bus voltage (mV): LSB is 8mV
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*/
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*val = regval * (is_shunt ? 40 : 8);
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return 0;
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case hwmon_in_enable:
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*val = ina3221_is_enabled(ina, channel);
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS] = {
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[hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2, INA3221_SHUNT3 },
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[hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3 },
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[hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2, INA3221_CRIT3 },
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[hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3 },
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[hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3 },
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};
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static int ina3221_read_curr(struct device *dev, u32 attr,
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int channel, long *val)
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{
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struct ina3221_data *ina = dev_get_drvdata(dev);
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struct ina3221_input *input = &ina->inputs[channel];
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int resistance_uo = input->shunt_resistor;
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u8 reg = ina3221_curr_reg[attr][channel];
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int regval, voltage_nv, ret;
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switch (attr) {
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case hwmon_curr_input:
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if (!ina3221_is_enabled(ina, channel))
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return -ENODATA;
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/* fall through */
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case hwmon_curr_crit:
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case hwmon_curr_max:
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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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/* Scale of shunt voltage: LSB is 40uV (40000nV) */
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voltage_nv = regval * 40000;
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/* Return current in mA */
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*val = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
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return 0;
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case hwmon_curr_crit_alarm:
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case hwmon_curr_max_alarm:
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ret = regmap_field_read(ina->fields[reg], ®val);
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if (ret)
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return ret;
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*val = regval;
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int ina3221_write_curr(struct device *dev, u32 attr,
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int channel, long val)
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{
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struct ina3221_data *ina = dev_get_drvdata(dev);
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struct ina3221_input *input = &ina->inputs[channel];
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int resistance_uo = input->shunt_resistor;
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u8 reg = ina3221_curr_reg[attr][channel];
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int regval, current_ma, voltage_uv;
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/* clamp current */
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current_ma = clamp_val(val,
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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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regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
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return regmap_write(ina->regmap, reg, regval);
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}
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static int ina3221_write_enable(struct device *dev, int channel, bool enable)
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{
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struct ina3221_data *ina = dev_get_drvdata(dev);
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u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
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int ret;
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config = enable ? mask : 0;
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/* Enable or disable the channel */
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ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
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if (ret)
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return ret;
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/* Cache the latest config register value */
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ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
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if (ret)
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return ret;
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return 0;
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}
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static int ina3221_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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switch (type) {
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case hwmon_in:
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/* 0-align channel ID */
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return ina3221_read_in(dev, attr, channel - 1, val);
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case hwmon_curr:
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return ina3221_read_curr(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int ina3221_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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switch (type) {
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case hwmon_in:
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/* 0-align channel ID */
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return ina3221_write_enable(dev, channel - 1, val);
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case hwmon_curr:
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return ina3221_write_curr(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, const char **str)
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{
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struct ina3221_data *ina = dev_get_drvdata(dev);
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int index = channel - 1;
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*str = ina->inputs[index].label;
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return 0;
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}
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static umode_t ina3221_is_visible(const void *drvdata,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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const struct ina3221_data *ina = drvdata;
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const struct ina3221_input *input = NULL;
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switch (type) {
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case hwmon_in:
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/* Ignore in0_ */
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if (channel == 0)
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return 0;
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switch (attr) {
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case hwmon_in_label:
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if (channel - 1 <= INA3221_CHANNEL3)
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input = &ina->inputs[channel - 1];
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/* Hide label node if label is not provided */
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return (input && input->label) ? 0444 : 0;
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case hwmon_in_input:
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return 0444;
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case hwmon_in_enable:
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return 0644;
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default:
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return 0;
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}
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case hwmon_curr:
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switch (attr) {
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case hwmon_curr_input:
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case hwmon_curr_crit_alarm:
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case hwmon_curr_max_alarm:
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return 0444;
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case hwmon_curr_crit:
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case hwmon_curr_max:
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return 0644;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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static const u32 ina3221_in_config[] = {
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/* 0: dummy, skipped in is_visible */
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HWMON_I_INPUT,
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/* 1-3: input voltage Channels */
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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/* 4-6: shunt voltage Channels */
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HWMON_I_INPUT,
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HWMON_I_INPUT,
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HWMON_I_INPUT,
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0
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};
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static const struct hwmon_channel_info ina3221_in = {
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.type = hwmon_in,
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.config = ina3221_in_config,
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};
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#define INA3221_HWMON_CURR_CONFIG (HWMON_C_INPUT | \
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HWMON_C_CRIT | HWMON_C_CRIT_ALARM | \
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HWMON_C_MAX | HWMON_C_MAX_ALARM)
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static const u32 ina3221_curr_config[] = {
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INA3221_HWMON_CURR_CONFIG,
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INA3221_HWMON_CURR_CONFIG,
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INA3221_HWMON_CURR_CONFIG,
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0
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};
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static const struct hwmon_channel_info ina3221_curr = {
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.type = hwmon_curr,
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.config = ina3221_curr_config,
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};
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static const struct hwmon_channel_info *ina3221_info[] = {
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&ina3221_in,
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&ina3221_curr,
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NULL
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};
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static const struct hwmon_ops ina3221_hwmon_ops = {
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.is_visible = ina3221_is_visible,
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.read_string = ina3221_read_string,
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.read = ina3221_read,
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.write = ina3221_write,
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};
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static const struct hwmon_chip_info ina3221_chip_info = {
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.ops = &ina3221_hwmon_ops,
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.info = ina3221_info,
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};
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/* Extra attribute groups */
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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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struct ina3221_input *input = &ina->inputs[channel];
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return snprintf(buf, PAGE_SIZE, "%d\n", input->shunt_resistor);
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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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struct ina3221_input *input = &ina->inputs[channel];
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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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input->shunt_resistor = val;
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return count;
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}
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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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static struct attribute *ina3221_attrs[] = {
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&sensor_dev_attr_shunt1_resistor.dev_attr.attr,
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&sensor_dev_attr_shunt2_resistor.dev_attr.attr,
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&sensor_dev_attr_shunt3_resistor.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_CONFIG, 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_child_from_dt(struct device *dev,
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struct device_node *child,
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struct ina3221_data *ina)
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{
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struct ina3221_input *input;
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u32 val;
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int ret;
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ret = of_property_read_u32(child, "reg", &val);
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if (ret) {
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dev_err(dev, "missing reg property of %s\n", child->name);
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return ret;
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} else if (val > INA3221_CHANNEL3) {
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dev_err(dev, "invalid reg %d of %s\n", val, child->name);
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return ret;
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}
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input = &ina->inputs[val];
|
|
|
|
/* Log the disconnected channel input */
|
|
if (!of_device_is_available(child)) {
|
|
input->disconnected = true;
|
|
return 0;
|
|
}
|
|
|
|
/* Save the connected input label if available */
|
|
of_property_read_string(child, "label", &input->label);
|
|
|
|
/* Overwrite default shunt resistor value optionally */
|
|
if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
|
|
if (val < 1 || val > INT_MAX) {
|
|
dev_err(dev, "invalid shunt resistor value %u of %s\n",
|
|
val, child->name);
|
|
return -EINVAL;
|
|
}
|
|
input->shunt_resistor = val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
|
|
{
|
|
const struct device_node *np = dev->of_node;
|
|
struct device_node *child;
|
|
int ret;
|
|
|
|
/* Compatible with non-DT platforms */
|
|
if (!np)
|
|
return 0;
|
|
|
|
for_each_child_of_node(np, child) {
|
|
ret = ina3221_probe_child_from_dt(dev, child, ina);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ina3221_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct ina3221_data *ina;
|
|
struct device *hwmon_dev;
|
|
int i, ret;
|
|
|
|
ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL);
|
|
if (!ina)
|
|
return -ENOMEM;
|
|
|
|
ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config);
|
|
if (IS_ERR(ina->regmap)) {
|
|
dev_err(dev, "Unable to allocate register map\n");
|
|
return PTR_ERR(ina->regmap);
|
|
}
|
|
|
|
for (i = 0; i < F_MAX_FIELDS; i++) {
|
|
ina->fields[i] = devm_regmap_field_alloc(dev,
|
|
ina->regmap,
|
|
ina3221_reg_fields[i]);
|
|
if (IS_ERR(ina->fields[i])) {
|
|
dev_err(dev, "Unable to allocate regmap fields\n");
|
|
return PTR_ERR(ina->fields[i]);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < INA3221_NUM_CHANNELS; i++)
|
|
ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT;
|
|
|
|
ret = ina3221_probe_from_dt(dev, ina);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to probe from device tree\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_field_write(ina->fields[F_RST], true);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to reset device\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Sync config register after reset */
|
|
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Disable channels if their inputs are disconnected */
|
|
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
|
|
if (ina->inputs[i].disconnected)
|
|
ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
|
|
}
|
|
ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_set_drvdata(dev, ina);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina,
|
|
&ina3221_chip_info,
|
|
ina3221_groups);
|
|
if (IS_ERR(hwmon_dev)) {
|
|
dev_err(dev, "Unable to register hwmon device\n");
|
|
return PTR_ERR(hwmon_dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused ina3221_suspend(struct device *dev)
|
|
{
|
|
struct ina3221_data *ina = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
/* Save config register value and enable cache-only */
|
|
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Set to power-down mode for power saving */
|
|
ret = regmap_update_bits(ina->regmap, INA3221_CONFIG,
|
|
INA3221_CONFIG_MODE_MASK,
|
|
INA3221_CONFIG_MODE_POWERDOWN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
regcache_cache_only(ina->regmap, true);
|
|
regcache_mark_dirty(ina->regmap);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused ina3221_resume(struct device *dev)
|
|
{
|
|
struct ina3221_data *ina = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
regcache_cache_only(ina->regmap, false);
|
|
|
|
/* Software reset the chip */
|
|
ret = regmap_field_write(ina->fields[F_RST], true);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to reset device\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Restore cached register values to hardware */
|
|
ret = regcache_sync(ina->regmap);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Restore config register value to hardware */
|
|
ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops ina3221_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume)
|
|
};
|
|
|
|
static const struct of_device_id ina3221_of_match_table[] = {
|
|
{ .compatible = "ti,ina3221", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ina3221_of_match_table);
|
|
|
|
static const struct i2c_device_id ina3221_ids[] = {
|
|
{ "ina3221", 0 },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ina3221_ids);
|
|
|
|
static struct i2c_driver ina3221_i2c_driver = {
|
|
.probe = ina3221_probe,
|
|
.driver = {
|
|
.name = INA3221_DRIVER_NAME,
|
|
.of_match_table = ina3221_of_match_table,
|
|
.pm = &ina3221_pm,
|
|
},
|
|
.id_table = ina3221_ids,
|
|
};
|
|
module_i2c_driver(ina3221_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
|
|
MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver");
|
|
MODULE_LICENSE("GPL v2");
|