607 lines
17 KiB
C
607 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the Texas Instruments / Burr Brown INA209
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* Bidirectional Current/Power Monitor
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*
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* Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
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*
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* Derived from Ira W. Snyder's original driver submission
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* Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca>
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* Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu>
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*
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* Aligned with ina2xx driver
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* Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
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* Thanks to Jan Volkering
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*
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* Datasheet:
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* https://www.ti.com/lit/gpn/ina209
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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/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/bug.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/platform_data/ina2xx.h>
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/* register definitions */
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#define INA209_CONFIGURATION 0x00
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#define INA209_STATUS 0x01
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#define INA209_STATUS_MASK 0x02
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#define INA209_SHUNT_VOLTAGE 0x03
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#define INA209_BUS_VOLTAGE 0x04
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#define INA209_POWER 0x05
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#define INA209_CURRENT 0x06
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#define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
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#define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
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#define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
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#define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
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#define INA209_POWER_PEAK 0x0b
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#define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
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#define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
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#define INA209_POWER_WARN 0x0e
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#define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
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#define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
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#define INA209_POWER_OVER_LIMIT 0x11
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#define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
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#define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
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#define INA209_CRITICAL_DAC_POS 0x14
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#define INA209_CRITICAL_DAC_NEG 0x15
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#define INA209_CALIBRATION 0x16
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#define INA209_REGISTERS 0x17
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#define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
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#define INA209_SHUNT_DEFAULT 10000 /* uOhm */
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struct ina209_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid;
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unsigned long last_updated; /* in jiffies */
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u16 regs[INA209_REGISTERS]; /* All chip registers */
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u16 config_orig; /* Original configuration */
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u16 calibration_orig; /* Original calibration */
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u16 update_interval;
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};
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static struct ina209_data *ina209_update_device(struct device *dev)
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{
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struct ina209_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct ina209_data *ret = data;
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s32 val;
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int i;
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mutex_lock(&data->update_lock);
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if (!data->valid ||
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time_after(jiffies, data->last_updated + data->update_interval)) {
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for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
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val = i2c_smbus_read_word_swapped(client, i);
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if (val < 0) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->regs[i] = val;
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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/*
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* Read a value from a device register and convert it to the
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* appropriate sysfs units
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*/
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static long ina209_from_reg(const u8 reg, const u16 val)
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{
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switch (reg) {
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case INA209_SHUNT_VOLTAGE:
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case INA209_SHUNT_VOLTAGE_POS_PEAK:
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case INA209_SHUNT_VOLTAGE_NEG_PEAK:
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case INA209_SHUNT_VOLTAGE_POS_WARN:
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case INA209_SHUNT_VOLTAGE_NEG_WARN:
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/* LSB=10 uV. Convert to mV. */
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return DIV_ROUND_CLOSEST((s16)val, 100);
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case INA209_BUS_VOLTAGE:
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case INA209_BUS_VOLTAGE_MAX_PEAK:
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case INA209_BUS_VOLTAGE_MIN_PEAK:
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case INA209_BUS_VOLTAGE_OVER_WARN:
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case INA209_BUS_VOLTAGE_UNDER_WARN:
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case INA209_BUS_VOLTAGE_OVER_LIMIT:
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case INA209_BUS_VOLTAGE_UNDER_LIMIT:
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/* LSB=4 mV, last 3 bits unused */
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return (val >> 3) * 4;
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case INA209_CRITICAL_DAC_POS:
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/* LSB=1 mV, in the upper 8 bits */
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return val >> 8;
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case INA209_CRITICAL_DAC_NEG:
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/* LSB=1 mV, in the upper 8 bits */
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return -1 * (val >> 8);
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case INA209_POWER:
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case INA209_POWER_PEAK:
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case INA209_POWER_WARN:
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case INA209_POWER_OVER_LIMIT:
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/* LSB=20 mW. Convert to uW */
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return val * 20 * 1000L;
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case INA209_CURRENT:
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/* LSB=1 mA (selected). Is in mA */
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return (s16)val;
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}
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/* programmer goofed */
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WARN_ON_ONCE(1);
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return 0;
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}
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/*
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* Take a value and convert it to register format, clamping the value
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* to the appropriate range.
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*/
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static int ina209_to_reg(u8 reg, u16 old, long val)
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{
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switch (reg) {
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case INA209_SHUNT_VOLTAGE_POS_WARN:
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case INA209_SHUNT_VOLTAGE_NEG_WARN:
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/* Limit to +- 320 mV, 10 uV LSB */
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return clamp_val(val, -320, 320) * 100;
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case INA209_BUS_VOLTAGE_OVER_WARN:
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case INA209_BUS_VOLTAGE_UNDER_WARN:
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case INA209_BUS_VOLTAGE_OVER_LIMIT:
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case INA209_BUS_VOLTAGE_UNDER_LIMIT:
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/*
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* Limit to 0-32000 mV, 4 mV LSB
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*
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* The last three bits aren't part of the value, but we'll
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* preserve them in their original state.
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*/
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return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
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| (old & 0x7);
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case INA209_CRITICAL_DAC_NEG:
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/*
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* Limit to -255-0 mV, 1 mV LSB
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* Convert the value to a positive value for the register
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*
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* The value lives in the top 8 bits only, be careful
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* and keep original value of other bits.
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*/
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return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
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case INA209_CRITICAL_DAC_POS:
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/*
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* Limit to 0-255 mV, 1 mV LSB
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*
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* The value lives in the top 8 bits only, be careful
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* and keep original value of other bits.
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*/
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return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
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case INA209_POWER_WARN:
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case INA209_POWER_OVER_LIMIT:
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/* 20 mW LSB */
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return DIV_ROUND_CLOSEST(val, 20 * 1000);
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}
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/* Other registers are read-only, return access error */
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return -EACCES;
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}
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static int ina209_interval_from_reg(u16 reg)
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{
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return 68 >> (15 - ((reg >> 3) & 0x0f));
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}
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static u16 ina209_reg_from_interval(u16 config, long interval)
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{
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int i, adc;
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if (interval <= 0) {
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adc = 8;
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} else {
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adc = 15;
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for (i = 34 + 34 / 2; i; i >>= 1) {
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if (i < interval)
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break;
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adc--;
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}
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}
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return (config & 0xf807) | (adc << 3) | (adc << 7);
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}
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static ssize_t ina209_interval_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 ina209_data *data = ina209_update_device(dev);
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long val;
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u16 regval;
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int ret;
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if (IS_ERR(data))
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return PTR_ERR(data);
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
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val);
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i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION,
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regval);
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data->regs[INA209_CONFIGURATION] = regval;
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data->update_interval = ina209_interval_from_reg(regval);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t ina209_interval_show(struct device *dev,
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struct device_attribute *da, char *buf)
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{
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struct ina209_data *data = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%d\n", data->update_interval);
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}
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/*
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* History is reset by writing 1 into bit 0 of the respective peak register.
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* Since more than one peak register may be affected by the scope of a
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* reset_history attribute write, use a bit mask in attr->index to identify
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* which registers are affected.
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*/
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static u16 ina209_reset_history_regs[] = {
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INA209_SHUNT_VOLTAGE_POS_PEAK,
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INA209_SHUNT_VOLTAGE_NEG_PEAK,
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INA209_BUS_VOLTAGE_MAX_PEAK,
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INA209_BUS_VOLTAGE_MIN_PEAK,
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INA209_POWER_PEAK
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};
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static ssize_t ina209_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 ina209_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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u32 mask = attr->index;
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long val;
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int i, ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
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if (mask & (1 << i))
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i2c_smbus_write_word_swapped(client,
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ina209_reset_history_regs[i], 1);
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}
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data->valid = false;
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t ina209_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 ina209_data *data = ina209_update_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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int reg = attr->index;
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long val;
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int ret;
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if (IS_ERR(data))
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return PTR_ERR(data);
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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ret = ina209_to_reg(reg, data->regs[reg], val);
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if (ret < 0) {
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count = ret;
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goto abort;
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}
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i2c_smbus_write_word_swapped(data->client, reg, ret);
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data->regs[reg] = ret;
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abort:
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t ina209_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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struct ina209_data *data = ina209_update_device(dev);
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long val;
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if (IS_ERR(data))
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return PTR_ERR(data);
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val = ina209_from_reg(attr->index, data->regs[attr->index]);
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return sysfs_emit(buf, "%ld\n", val);
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}
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static ssize_t ina209_alarm_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 ina209_data *data = ina209_update_device(dev);
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const unsigned int mask = attr->index;
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u16 status;
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if (IS_ERR(data))
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return PTR_ERR(data);
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status = data->regs[INA209_STATUS];
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/*
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* All alarms are in the INA209_STATUS register. To avoid a long
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* switch statement, the mask is passed in attr->index
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*/
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return sysfs_emit(buf, "%u\n", !!(status & mask));
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}
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/* Shunt voltage, history, limits, alarms */
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static SENSOR_DEVICE_ATTR_RO(in0_input, ina209_value, INA209_SHUNT_VOLTAGE);
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static SENSOR_DEVICE_ATTR_RO(in0_input_highest, ina209_value,
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INA209_SHUNT_VOLTAGE_POS_PEAK);
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static SENSOR_DEVICE_ATTR_RO(in0_input_lowest, ina209_value,
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INA209_SHUNT_VOLTAGE_NEG_PEAK);
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static SENSOR_DEVICE_ATTR_WO(in0_reset_history, ina209_history,
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(1 << 0) | (1 << 1));
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static SENSOR_DEVICE_ATTR_RW(in0_max, ina209_value,
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INA209_SHUNT_VOLTAGE_POS_WARN);
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static SENSOR_DEVICE_ATTR_RW(in0_min, ina209_value,
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INA209_SHUNT_VOLTAGE_NEG_WARN);
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static SENSOR_DEVICE_ATTR_RW(in0_crit_max, ina209_value,
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INA209_CRITICAL_DAC_POS);
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static SENSOR_DEVICE_ATTR_RW(in0_crit_min, ina209_value,
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INA209_CRITICAL_DAC_NEG);
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static SENSOR_DEVICE_ATTR_RO(in0_min_alarm, ina209_alarm, 1 << 11);
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static SENSOR_DEVICE_ATTR_RO(in0_max_alarm, ina209_alarm, 1 << 12);
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static SENSOR_DEVICE_ATTR_RO(in0_crit_min_alarm, ina209_alarm, 1 << 6);
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static SENSOR_DEVICE_ATTR_RO(in0_crit_max_alarm, ina209_alarm, 1 << 7);
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/* Bus voltage, history, limits, alarms */
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static SENSOR_DEVICE_ATTR_RO(in1_input, ina209_value, INA209_BUS_VOLTAGE);
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static SENSOR_DEVICE_ATTR_RO(in1_input_highest, ina209_value,
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INA209_BUS_VOLTAGE_MAX_PEAK);
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static SENSOR_DEVICE_ATTR_RO(in1_input_lowest, ina209_value,
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INA209_BUS_VOLTAGE_MIN_PEAK);
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static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ina209_history,
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(1 << 2) | (1 << 3));
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static SENSOR_DEVICE_ATTR_RW(in1_max, ina209_value,
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INA209_BUS_VOLTAGE_OVER_WARN);
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static SENSOR_DEVICE_ATTR_RW(in1_min, ina209_value,
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INA209_BUS_VOLTAGE_UNDER_WARN);
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static SENSOR_DEVICE_ATTR_RW(in1_crit_max, ina209_value,
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INA209_BUS_VOLTAGE_OVER_LIMIT);
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static SENSOR_DEVICE_ATTR_RW(in1_crit_min, ina209_value,
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INA209_BUS_VOLTAGE_UNDER_LIMIT);
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static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ina209_alarm, 1 << 14);
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static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ina209_alarm, 1 << 15);
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static SENSOR_DEVICE_ATTR_RO(in1_crit_min_alarm, ina209_alarm, 1 << 9);
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static SENSOR_DEVICE_ATTR_RO(in1_crit_max_alarm, ina209_alarm, 1 << 10);
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/* Power */
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static SENSOR_DEVICE_ATTR_RO(power1_input, ina209_value, INA209_POWER);
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static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ina209_value,
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INA209_POWER_PEAK);
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static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ina209_history, 1 << 4);
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static SENSOR_DEVICE_ATTR_RW(power1_max, ina209_value, INA209_POWER_WARN);
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static SENSOR_DEVICE_ATTR_RW(power1_crit, ina209_value,
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INA209_POWER_OVER_LIMIT);
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static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ina209_alarm, 1 << 13);
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static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina209_alarm, 1 << 8);
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/* Current */
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static SENSOR_DEVICE_ATTR_RO(curr1_input, ina209_value, INA209_CURRENT);
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static SENSOR_DEVICE_ATTR_RW(update_interval, ina209_interval, 0);
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/*
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* Finally, construct an array of pointers to members of the above objects,
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* as required for sysfs_create_group()
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*/
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static struct attribute *ina209_attrs[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in0_input_highest.dev_attr.attr,
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&sensor_dev_attr_in0_input_lowest.dev_attr.attr,
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&sensor_dev_attr_in0_reset_history.dev_attr.attr,
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&sensor_dev_attr_in0_max.dev_attr.attr,
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&sensor_dev_attr_in0_min.dev_attr.attr,
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&sensor_dev_attr_in0_crit_max.dev_attr.attr,
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&sensor_dev_attr_in0_crit_min.dev_attr.attr,
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&sensor_dev_attr_in0_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in0_min_alarm.dev_attr.attr,
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&sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_input_highest.dev_attr.attr,
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&sensor_dev_attr_in1_input_lowest.dev_attr.attr,
|
|
&sensor_dev_attr_in1_reset_history.dev_attr.attr,
|
|
&sensor_dev_attr_in1_max.dev_attr.attr,
|
|
&sensor_dev_attr_in1_min.dev_attr.attr,
|
|
&sensor_dev_attr_in1_crit_max.dev_attr.attr,
|
|
&sensor_dev_attr_in1_crit_min.dev_attr.attr,
|
|
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_power1_input.dev_attr.attr,
|
|
&sensor_dev_attr_power1_input_highest.dev_attr.attr,
|
|
&sensor_dev_attr_power1_reset_history.dev_attr.attr,
|
|
&sensor_dev_attr_power1_max.dev_attr.attr,
|
|
&sensor_dev_attr_power1_crit.dev_attr.attr,
|
|
&sensor_dev_attr_power1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_curr1_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_update_interval.dev_attr.attr,
|
|
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(ina209);
|
|
|
|
static void ina209_restore_conf(struct i2c_client *client,
|
|
struct ina209_data *data)
|
|
{
|
|
/* Restore initial configuration */
|
|
i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
|
|
data->config_orig);
|
|
i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
|
|
data->calibration_orig);
|
|
}
|
|
|
|
static int ina209_init_client(struct i2c_client *client,
|
|
struct ina209_data *data)
|
|
{
|
|
struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
u32 shunt;
|
|
int reg;
|
|
|
|
reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
|
|
if (reg < 0)
|
|
return reg;
|
|
data->calibration_orig = reg;
|
|
|
|
reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
|
|
if (reg < 0)
|
|
return reg;
|
|
data->config_orig = reg;
|
|
|
|
if (pdata) {
|
|
if (pdata->shunt_uohms <= 0)
|
|
return -EINVAL;
|
|
shunt = pdata->shunt_uohms;
|
|
} else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
|
|
&shunt)) {
|
|
if (shunt == 0)
|
|
return -EINVAL;
|
|
} else {
|
|
shunt = data->calibration_orig ?
|
|
40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
|
|
}
|
|
|
|
i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
|
|
INA209_CONFIG_DEFAULT);
|
|
data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
|
|
|
|
/*
|
|
* Calibrate current LSB to 1mA. Shunt is in uOhms.
|
|
* See equation 13 in datasheet.
|
|
*/
|
|
i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
|
|
clamp_val(40960000 / shunt, 1, 65535));
|
|
|
|
/* Clear status register */
|
|
i2c_smbus_read_word_swapped(client, INA209_STATUS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ina209_probe(struct i2c_client *client)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
struct ina209_data *data;
|
|
struct device *hwmon_dev;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
ret = ina209_init_client(client, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
|
|
client->name,
|
|
data, ina209_groups);
|
|
if (IS_ERR(hwmon_dev)) {
|
|
ret = PTR_ERR(hwmon_dev);
|
|
goto out_restore_conf;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_restore_conf:
|
|
ina209_restore_conf(client, data);
|
|
return ret;
|
|
}
|
|
|
|
static void ina209_remove(struct i2c_client *client)
|
|
{
|
|
struct ina209_data *data = i2c_get_clientdata(client);
|
|
|
|
ina209_restore_conf(client, data);
|
|
}
|
|
|
|
static const struct i2c_device_id ina209_id[] = {
|
|
{ "ina209", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ina209_id);
|
|
|
|
static const struct of_device_id __maybe_unused ina209_of_match[] = {
|
|
{ .compatible = "ti,ina209" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ina209_of_match);
|
|
|
|
/* This is the driver that will be inserted */
|
|
static struct i2c_driver ina209_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "ina209",
|
|
.of_match_table = of_match_ptr(ina209_of_match),
|
|
},
|
|
.probe_new = ina209_probe,
|
|
.remove = ina209_remove,
|
|
.id_table = ina209_id,
|
|
};
|
|
|
|
module_i2c_driver(ina209_driver);
|
|
|
|
MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("INA209 driver");
|
|
MODULE_LICENSE("GPL");
|