hwmon: INA219 and INA226 support
Add support for the Texas Instruments INA219 and INA226 power monitors. Signed-off-by: Lothar Felten <l-felten@ti.com> [guenter.roeck@ericsson.com: formatting cleanup; check for smbus word data; select PGA=8 for INA219] Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Felten, Lothar
Guenter Roeck
Родитель
9172b5d124
Коммит
f7c2fe386a
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@ -0,0 +1,29 @@
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Kernel driver ina2xx
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====================
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Supported chips:
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* Texas Instruments INA219
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Prefix: 'ina219'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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* Texas Instruments INA226
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Prefix: 'ina226'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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Author: Lothar Felten <l-felten@ti.com>
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Description
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-----------
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The INA219 is a high-side current shunt and power monitor with an I2C
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interface. The INA219 monitors both shunt drop and supply voltage, with
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programmable conversion times and filtering.
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The INA226 is a current shunt and power monitor with an I2C interface.
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The INA226 monitors both a shunt voltage drop and bus supply voltage.
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The shunt value in micro-ohms can be set via platform data.
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@ -1102,6 +1102,19 @@ config SENSORS_AMC6821
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This driver can also be build as a module. If so, the module
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will be called amc6821.
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config SENSORS_INA2XX
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tristate "Texas Instruments INA219, INA226"
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depends on I2C && EXPERIMENTAL
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help
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If you say yes here you get support for INA219 and INA226 power
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monitor chips.
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The INA2xx driver is configured for the default configuration of
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the part as described in the datasheet.
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Default value for Rshunt is 10 mOhms.
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This driver can also be built as a module. If so, the module
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will be called ina2xx.
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config SENSORS_THMC50
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tristate "Texas Instruments THMC50 / Analog Devices ADM1022"
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depends on I2C
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@ -62,6 +62,7 @@ obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
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obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
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obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
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obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
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obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
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obj-$(CONFIG_SENSORS_IT87) += it87.o
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obj-$(CONFIG_SENSORS_JC42) += jc42.o
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obj-$(CONFIG_SENSORS_JZ4740) += jz4740-hwmon.o
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@ -0,0 +1,368 @@
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/*
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* Driver for Texas Instruments INA219, INA226 power monitor chips
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*
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* INA219:
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* Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
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* Datasheet: http://www.ti.com/product/ina219
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*
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* INA226:
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* Bi-Directional Current/Power Monitor with I2C Interface
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* Datasheet: http://www.ti.com/product/ina226
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*
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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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* 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 as published by
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* the Free Software Foundation; version 2 of the License.
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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/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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/* common register definitions */
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#define INA2XX_CONFIG 0x00
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#define INA2XX_SHUNT_VOLTAGE 0x01 /* readonly */
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#define INA2XX_BUS_VOLTAGE 0x02 /* readonly */
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#define INA2XX_POWER 0x03 /* readonly */
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#define INA2XX_CURRENT 0x04 /* readonly */
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#define INA2XX_CALIBRATION 0x05
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/* INA226 register definitions */
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#define INA226_MASK_ENABLE 0x06
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#define INA226_ALERT_LIMIT 0x07
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#define INA226_DIE_ID 0xFF
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/* register count */
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#define INA219_REGISTERS 6
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#define INA226_REGISTERS 8
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#define INA2XX_MAX_REGISTERS 8
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/* settings - depend on use case */
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#define INA219_CONFIG_DEFAULT 0x399F /* PGA=8 */
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#define INA226_CONFIG_DEFAULT 0x4527 /* averages=16 */
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/* worst case is 68.10 ms (~14.6Hz, ina219) */
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#define INA2XX_CONVERSION_RATE 15
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enum ina2xx_ids { ina219, ina226 };
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struct ina2xx_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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bool valid;
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unsigned long last_updated;
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int kind;
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int registers;
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u16 regs[INA2XX_MAX_REGISTERS];
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};
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int ina2xx_read_word(struct i2c_client *client, int reg)
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{
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int val = i2c_smbus_read_word_data(client, reg);
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if (unlikely(val < 0)) {
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dev_dbg(&client->dev,
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"Failed to read register: %d\n", reg);
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return val;
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}
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return be16_to_cpu(val);
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}
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void ina2xx_write_word(struct i2c_client *client, int reg, int data)
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{
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i2c_smbus_write_word_data(client, reg, cpu_to_be16(data));
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}
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static struct ina2xx_data *ina2xx_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ina2xx_data *data = i2c_get_clientdata(client);
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struct ina2xx_data *ret = data;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated +
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HZ / INA2XX_CONVERSION_RATE) || !data->valid) {
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int i;
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dev_dbg(&client->dev, "Starting ina2xx update\n");
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/* Read all registers */
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for (i = 0; i < data->registers; i++) {
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int rv = ina2xx_read_word(client, i);
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if (rv < 0) {
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ret = ERR_PTR(rv);
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goto abort;
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}
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data->regs[i] = rv;
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}
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data->last_updated = jiffies;
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data->valid = 1;
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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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static int ina219_get_value(struct ina2xx_data *data, u8 reg)
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{
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/*
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* calculate exact value for the given register
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* we assume default power-on reset settings:
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* bus voltage range 32V
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* gain = /8
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* adc 1 & 2 -> conversion time 532uS
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* mode is continuous shunt and bus
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* calibration value is INA219_CALIBRATION_VALUE
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*/
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int val = data->regs[reg];
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switch (reg) {
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case INA2XX_SHUNT_VOLTAGE:
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/* LSB=10uV. Convert to mV. */
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val = DIV_ROUND_CLOSEST(val, 100);
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break;
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case INA2XX_BUS_VOLTAGE:
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/* LSB=4mV. Register is not right aligned, convert to mV. */
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val = (val >> 3) * 4;
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break;
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case INA2XX_POWER:
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/* LSB=20mW. Convert to uW */
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val = val * 20 * 1000;
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break;
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case INA2XX_CURRENT:
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/* LSB=1mA (selected). Is in mA */
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break;
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default:
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/* programmer goofed */
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WARN_ON_ONCE(1);
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val = 0;
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break;
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}
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return val;
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}
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static int ina226_get_value(struct ina2xx_data *data, u8 reg)
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{
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/*
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* calculate exact value for the given register
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* we assume default power-on reset settings:
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* bus voltage range 32V
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* gain = /8
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* adc 1 & 2 -> conversion time 532uS
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* mode is continuous shunt and bus
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* calibration value is INA226_CALIBRATION_VALUE
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*/
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int val = data->regs[reg];
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switch (reg) {
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case INA2XX_SHUNT_VOLTAGE:
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/* LSB=2.5uV. Convert to mV. */
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val = DIV_ROUND_CLOSEST(val, 400);
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break;
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case INA2XX_BUS_VOLTAGE:
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/* LSB=1.25mV. Convert to mV. */
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val = val + DIV_ROUND_CLOSEST(val, 4);
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break;
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case INA2XX_POWER:
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/* LSB=25mW. Convert to uW */
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val = val * 25 * 1000;
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break;
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case INA2XX_CURRENT:
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/* LSB=1mA (selected). Is in mA */
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break;
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default:
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/* programmer goofed */
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WARN_ON_ONCE(1);
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val = 0;
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break;
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}
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return val;
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}
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static ssize_t ina2xx_show_value(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 ina2xx_data *data = ina2xx_update_device(dev);
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int value = 0;
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if (IS_ERR(data))
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return PTR_ERR(data);
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switch (data->kind) {
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case ina219:
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value = ina219_get_value(data, attr->index);
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break;
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case ina226:
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value = ina226_get_value(data, attr->index);
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break;
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default:
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WARN_ON_ONCE(1);
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break;
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}
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return snprintf(buf, PAGE_SIZE, "%d\n", value);
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}
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/* shunt voltage */
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static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, \
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ina2xx_show_value, NULL, INA2XX_SHUNT_VOLTAGE);
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/* bus voltage */
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, \
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ina2xx_show_value, NULL, INA2XX_BUS_VOLTAGE);
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/* calculated current */
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static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, \
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ina2xx_show_value, NULL, INA2XX_CURRENT);
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/* calculated power */
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static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, \
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ina2xx_show_value, NULL, INA2XX_POWER);
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/* pointers to created device attributes */
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static struct attribute *ina2xx_attributes[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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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_power1_input.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ina2xx_group = {
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.attrs = ina2xx_attributes,
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};
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static int ina2xx_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct ina2xx_data *data;
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struct ina2xx_platform_data *pdata;
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int ret = 0;
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long shunt = 10000; /* default shunt value 10mOhms */
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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if (client->dev.platform_data) {
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pdata =
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(struct ina2xx_platform_data *)client->dev.platform_data;
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shunt = pdata->shunt_uohms;
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}
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if (shunt <= 0)
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return -ENODEV;
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/* set the device type */
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data->kind = id->driver_data;
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switch (data->kind) {
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case ina219:
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/* device configuration */
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ina2xx_write_word(client, INA2XX_CONFIG, INA219_CONFIG_DEFAULT);
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/* set current LSB to 1mA, shunt is in uOhms */
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/* (equation 13 in datasheet) */
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ina2xx_write_word(client, INA2XX_CALIBRATION, 40960000 / shunt);
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dev_info(&client->dev,
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"power monitor INA219 (Rshunt = %li uOhm)\n", shunt);
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data->registers = INA219_REGISTERS;
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break;
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case ina226:
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/* device configuration */
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ina2xx_write_word(client, INA2XX_CONFIG, INA226_CONFIG_DEFAULT);
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/* set current LSB to 1mA, shunt is in uOhms */
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/* (equation 1 in datasheet)*/
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ina2xx_write_word(client, INA2XX_CALIBRATION, 5120000 / shunt);
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dev_info(&client->dev,
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"power monitor INA226 (Rshunt = %li uOhm)\n", shunt);
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data->registers = INA226_REGISTERS;
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break;
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default:
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/* unknown device id */
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return -ENODEV;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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ret = sysfs_create_group(&client->dev.kobj, &ina2xx_group);
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if (ret)
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return ret;
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data->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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ret = PTR_ERR(data->hwmon_dev);
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goto out_err_hwmon;
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}
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return 0;
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out_err_hwmon:
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sysfs_remove_group(&client->dev.kobj, &ina2xx_group);
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return ret;
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}
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static int ina2xx_remove(struct i2c_client *client)
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{
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struct ina2xx_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &ina2xx_group);
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return 0;
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}
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static const struct i2c_device_id ina2xx_id[] = {
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{ "ina219", ina219 },
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{ "ina226", ina226 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ina2xx_id);
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static struct i2c_driver ina2xx_driver = {
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.driver = {
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.name = "ina2xx",
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},
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.probe = ina2xx_probe,
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.remove = ina2xx_remove,
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.id_table = ina2xx_id,
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};
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static int __init ina2xx_init(void)
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{
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return i2c_add_driver(&ina2xx_driver);
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}
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static void __exit ina2xx_exit(void)
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{
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i2c_del_driver(&ina2xx_driver);
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}
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MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
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MODULE_DESCRIPTION("ina2xx driver");
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MODULE_LICENSE("GPL");
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module_init(ina2xx_init);
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module_exit(ina2xx_exit);
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|
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@ -0,0 +1,19 @@
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/*
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* Driver for Texas Instruments INA219, INA226 power monitor chips
|
||||
*
|
||||
* Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* For further information, see the Documentation/hwmon/ina2xx file.
|
||||
*/
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||||
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/**
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* struct ina2xx_platform_data - ina2xx info
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* @shunt_uohms shunt resistance in microohms
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*/
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struct ina2xx_platform_data {
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long shunt_uohms;
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};
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