mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 07:34:06 +08:00
c0214f9894
All devices supported by ina2xx are bidirectional and report the measured shunt voltage and power values as a signed 16 bit, but the current driver implementation caches all registers as u16, leading to an incorrect sign extension when reporting to userspace in ina2xx_get_value(). This patch fixes the problem by casting the signed registers to s16. Tested on an INA219. Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com> Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Guenter Roeck <linux@roeck-us.net>
293 lines
7.1 KiB
C
293 lines
7.1 KiB
C
/*
|
|
* Driver for Texas Instruments INA219, INA226 power monitor chips
|
|
*
|
|
* INA219:
|
|
* Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
|
|
* Datasheet: http://www.ti.com/product/ina219
|
|
*
|
|
* INA220:
|
|
* Bi-Directional Current/Power Monitor with I2C Interface
|
|
* Datasheet: http://www.ti.com/product/ina220
|
|
*
|
|
* INA226:
|
|
* Bi-Directional Current/Power Monitor with I2C Interface
|
|
* Datasheet: http://www.ti.com/product/ina226
|
|
*
|
|
* INA230:
|
|
* Bi-directional Current/Power Monitor with I2C Interface
|
|
* Datasheet: http://www.ti.com/product/ina230
|
|
*
|
|
* Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
|
|
* Thanks to Jan Volkering
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/platform_data/ina2xx.h>
|
|
|
|
/* common register definitions */
|
|
#define INA2XX_CONFIG 0x00
|
|
#define INA2XX_SHUNT_VOLTAGE 0x01 /* readonly */
|
|
#define INA2XX_BUS_VOLTAGE 0x02 /* readonly */
|
|
#define INA2XX_POWER 0x03 /* readonly */
|
|
#define INA2XX_CURRENT 0x04 /* readonly */
|
|
#define INA2XX_CALIBRATION 0x05
|
|
|
|
/* INA226 register definitions */
|
|
#define INA226_MASK_ENABLE 0x06
|
|
#define INA226_ALERT_LIMIT 0x07
|
|
#define INA226_DIE_ID 0xFF
|
|
|
|
|
|
/* register count */
|
|
#define INA219_REGISTERS 6
|
|
#define INA226_REGISTERS 8
|
|
|
|
#define INA2XX_MAX_REGISTERS 8
|
|
|
|
/* settings - depend on use case */
|
|
#define INA219_CONFIG_DEFAULT 0x399F /* PGA=8 */
|
|
#define INA226_CONFIG_DEFAULT 0x4527 /* averages=16 */
|
|
|
|
/* worst case is 68.10 ms (~14.6Hz, ina219) */
|
|
#define INA2XX_CONVERSION_RATE 15
|
|
|
|
enum ina2xx_ids { ina219, ina226 };
|
|
|
|
struct ina2xx_config {
|
|
u16 config_default;
|
|
int calibration_factor;
|
|
int registers;
|
|
int shunt_div;
|
|
int bus_voltage_shift;
|
|
int bus_voltage_lsb; /* uV */
|
|
int power_lsb; /* uW */
|
|
};
|
|
|
|
struct ina2xx_data {
|
|
struct i2c_client *client;
|
|
const struct ina2xx_config *config;
|
|
|
|
struct mutex update_lock;
|
|
bool valid;
|
|
unsigned long last_updated;
|
|
|
|
int kind;
|
|
u16 regs[INA2XX_MAX_REGISTERS];
|
|
};
|
|
|
|
static const struct ina2xx_config ina2xx_config[] = {
|
|
[ina219] = {
|
|
.config_default = INA219_CONFIG_DEFAULT,
|
|
.calibration_factor = 40960000,
|
|
.registers = INA219_REGISTERS,
|
|
.shunt_div = 100,
|
|
.bus_voltage_shift = 3,
|
|
.bus_voltage_lsb = 4000,
|
|
.power_lsb = 20000,
|
|
},
|
|
[ina226] = {
|
|
.config_default = INA226_CONFIG_DEFAULT,
|
|
.calibration_factor = 5120000,
|
|
.registers = INA226_REGISTERS,
|
|
.shunt_div = 400,
|
|
.bus_voltage_shift = 0,
|
|
.bus_voltage_lsb = 1250,
|
|
.power_lsb = 25000,
|
|
},
|
|
};
|
|
|
|
static struct ina2xx_data *ina2xx_update_device(struct device *dev)
|
|
{
|
|
struct ina2xx_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
struct ina2xx_data *ret = data;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated +
|
|
HZ / INA2XX_CONVERSION_RATE) || !data->valid) {
|
|
|
|
int i;
|
|
|
|
dev_dbg(&client->dev, "Starting ina2xx update\n");
|
|
|
|
/* Read all registers */
|
|
for (i = 0; i < data->config->registers; i++) {
|
|
int rv = i2c_smbus_read_word_swapped(client, i);
|
|
if (rv < 0) {
|
|
ret = ERR_PTR(rv);
|
|
goto abort;
|
|
}
|
|
data->regs[i] = rv;
|
|
}
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
abort:
|
|
mutex_unlock(&data->update_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int ina2xx_get_value(struct ina2xx_data *data, u8 reg)
|
|
{
|
|
int val;
|
|
|
|
switch (reg) {
|
|
case INA2XX_SHUNT_VOLTAGE:
|
|
/* signed register */
|
|
val = DIV_ROUND_CLOSEST((s16)data->regs[reg],
|
|
data->config->shunt_div);
|
|
break;
|
|
case INA2XX_BUS_VOLTAGE:
|
|
val = (data->regs[reg] >> data->config->bus_voltage_shift)
|
|
* data->config->bus_voltage_lsb;
|
|
val = DIV_ROUND_CLOSEST(val, 1000);
|
|
break;
|
|
case INA2XX_POWER:
|
|
val = data->regs[reg] * data->config->power_lsb;
|
|
break;
|
|
case INA2XX_CURRENT:
|
|
/* signed register, LSB=1mA (selected), in mA */
|
|
val = (s16)data->regs[reg];
|
|
break;
|
|
default:
|
|
/* programmer goofed */
|
|
WARN_ON_ONCE(1);
|
|
val = 0;
|
|
break;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static ssize_t ina2xx_show_value(struct device *dev,
|
|
struct device_attribute *da, char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct ina2xx_data *data = ina2xx_update_device(dev);
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n",
|
|
ina2xx_get_value(data, attr->index));
|
|
}
|
|
|
|
/* shunt voltage */
|
|
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL,
|
|
INA2XX_SHUNT_VOLTAGE);
|
|
|
|
/* bus voltage */
|
|
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL,
|
|
INA2XX_BUS_VOLTAGE);
|
|
|
|
/* calculated current */
|
|
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL,
|
|
INA2XX_CURRENT);
|
|
|
|
/* calculated power */
|
|
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
|
|
INA2XX_POWER);
|
|
|
|
/* pointers to created device attributes */
|
|
static struct attribute *ina2xx_attrs[] = {
|
|
&sensor_dev_attr_in0_input.dev_attr.attr,
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr1_input.dev_attr.attr,
|
|
&sensor_dev_attr_power1_input.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(ina2xx);
|
|
|
|
static int ina2xx_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
struct ina2xx_platform_data *pdata;
|
|
struct device *dev = &client->dev;
|
|
struct ina2xx_data *data;
|
|
struct device *hwmon_dev;
|
|
long shunt = 10000; /* default shunt value 10mOhms */
|
|
u32 val;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
if (dev_get_platdata(dev)) {
|
|
pdata = dev_get_platdata(dev);
|
|
shunt = pdata->shunt_uohms;
|
|
} else if (!of_property_read_u32(dev->of_node,
|
|
"shunt-resistor", &val)) {
|
|
shunt = val;
|
|
}
|
|
|
|
if (shunt <= 0)
|
|
return -ENODEV;
|
|
|
|
/* set the device type */
|
|
data->kind = id->driver_data;
|
|
data->config = &ina2xx_config[data->kind];
|
|
|
|
/* device configuration */
|
|
i2c_smbus_write_word_swapped(client, INA2XX_CONFIG,
|
|
data->config->config_default);
|
|
/* set current LSB to 1mA, shunt is in uOhms */
|
|
/* (equation 13 in datasheet) */
|
|
i2c_smbus_write_word_swapped(client, INA2XX_CALIBRATION,
|
|
data->config->calibration_factor / shunt);
|
|
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data, ina2xx_groups);
|
|
if (IS_ERR(hwmon_dev))
|
|
return PTR_ERR(hwmon_dev);
|
|
|
|
dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
|
|
id->name, shunt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ina2xx_id[] = {
|
|
{ "ina219", ina219 },
|
|
{ "ina220", ina219 },
|
|
{ "ina226", ina226 },
|
|
{ "ina230", ina226 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ina2xx_id);
|
|
|
|
static struct i2c_driver ina2xx_driver = {
|
|
.driver = {
|
|
.name = "ina2xx",
|
|
},
|
|
.probe = ina2xx_probe,
|
|
.id_table = ina2xx_id,
|
|
};
|
|
|
|
module_i2c_driver(ina2xx_driver);
|
|
|
|
MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
|
|
MODULE_DESCRIPTION("ina2xx driver");
|
|
MODULE_LICENSE("GPL");
|