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linux/drivers/hwmon/ina2xx.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

730 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Texas Instruments INA219, INA226 power monitor chips
*
* INA219:
* Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
* Datasheet: https://www.ti.com/product/ina219
*
* INA220:
* Bi-Directional Current/Power Monitor with I2C Interface
* Datasheet: https://www.ti.com/product/ina220
*
* INA226:
* Bi-Directional Current/Power Monitor with I2C Interface
* Datasheet: https://www.ti.com/product/ina226
*
* INA230:
* Bi-directional Current/Power Monitor with I2C Interface
* Datasheet: https://www.ti.com/product/ina230
*
* Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com>
* Thanks to Jan Volkering
*/
#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_device.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/util_macros.h>
#include <linux/regmap.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
#define INA2XX_MAX_DELAY 69 /* worst case delay in ms */
#define INA2XX_RSHUNT_DEFAULT 10000
/* bit mask for reading the averaging setting in the configuration register */
#define INA226_AVG_RD_MASK 0x0E00
#define INA226_READ_AVG(reg) (((reg) & INA226_AVG_RD_MASK) >> 9)
#define INA226_SHIFT_AVG(val) ((val) << 9)
/* bit number of alert functions in Mask/Enable Register */
#define INA226_SHUNT_OVER_VOLTAGE_BIT 15
#define INA226_SHUNT_UNDER_VOLTAGE_BIT 14
#define INA226_BUS_OVER_VOLTAGE_BIT 13
#define INA226_BUS_UNDER_VOLTAGE_BIT 12
#define INA226_POWER_OVER_LIMIT_BIT 11
/* bit mask for alert config bits of Mask/Enable Register */
#define INA226_ALERT_CONFIG_MASK 0xFC00
#define INA226_ALERT_FUNCTION_FLAG BIT(4)
/* common attrs, ina226 attrs and NULL */
#define INA2XX_MAX_ATTRIBUTE_GROUPS 3
/*
* Both bus voltage and shunt voltage conversion times for ina226 are set
* to 0b0100 on POR, which translates to 2200 microseconds in total.
*/
#define INA226_TOTAL_CONV_TIME_DEFAULT 2200
static struct regmap_config ina2xx_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
};
enum ina2xx_ids { ina219, ina226 };
struct ina2xx_config {
u16 config_default;
int calibration_value;
int registers;
int shunt_div;
int bus_voltage_shift;
int bus_voltage_lsb; /* uV */
int power_lsb_factor;
};
struct ina2xx_data {
const struct ina2xx_config *config;
long rshunt;
long current_lsb_uA;
long power_lsb_uW;
struct mutex config_lock;
struct regmap *regmap;
const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
};
static const struct ina2xx_config ina2xx_config[] = {
[ina219] = {
.config_default = INA219_CONFIG_DEFAULT,
.calibration_value = 4096,
.registers = INA219_REGISTERS,
.shunt_div = 100,
.bus_voltage_shift = 3,
.bus_voltage_lsb = 4000,
.power_lsb_factor = 20,
},
[ina226] = {
.config_default = INA226_CONFIG_DEFAULT,
.calibration_value = 2048,
.registers = INA226_REGISTERS,
.shunt_div = 400,
.bus_voltage_shift = 0,
.bus_voltage_lsb = 1250,
.power_lsb_factor = 25,
},
};
/*
* Available averaging rates for ina226. The indices correspond with
* the bit values expected by the chip (according to the ina226 datasheet,
* table 3 AVG bit settings, found at
* https://www.ti.com/lit/ds/symlink/ina226.pdf.
*/
static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
static int ina226_reg_to_interval(u16 config)
{
int avg = ina226_avg_tab[INA226_READ_AVG(config)];
/*
* Multiply the total conversion time by the number of averages.
* Return the result in milliseconds.
*/
return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
}
/*
* Return the new, shifted AVG field value of CONFIG register,
* to use with regmap_update_bits
*/
static u16 ina226_interval_to_reg(int interval)
{
int avg, avg_bits;
avg = DIV_ROUND_CLOSEST(interval * 1000,
INA226_TOTAL_CONV_TIME_DEFAULT);
avg_bits = find_closest(avg, ina226_avg_tab,
ARRAY_SIZE(ina226_avg_tab));
return INA226_SHIFT_AVG(avg_bits);
}
/*
* Calibration register is set to the best value, which eliminates
* truncation errors on calculating current register in hardware.
* According to datasheet (eq. 3) the best values are 2048 for
* ina226 and 4096 for ina219. They are hardcoded as calibration_value.
*/
static int ina2xx_calibrate(struct ina2xx_data *data)
{
return regmap_write(data->regmap, INA2XX_CALIBRATION,
data->config->calibration_value);
}
/*
* Initialize the configuration and calibration registers.
*/
static int ina2xx_init(struct ina2xx_data *data)
{
int ret = regmap_write(data->regmap, INA2XX_CONFIG,
data->config->config_default);
if (ret < 0)
return ret;
return ina2xx_calibrate(data);
}
static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
{
struct ina2xx_data *data = dev_get_drvdata(dev);
int ret, retry;
dev_dbg(dev, "Starting register %d read\n", reg);
for (retry = 5; retry; retry--) {
ret = regmap_read(data->regmap, reg, regval);
if (ret < 0)
return ret;
dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
/*
* If the current value in the calibration register is 0, the
* power and current registers will also remain at 0. In case
* the chip has been reset let's check the calibration
* register and reinitialize if needed.
* We do that extra read of the calibration register if there
* is some hint of a chip reset.
*/
if (*regval == 0) {
unsigned int cal;
ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
&cal);
if (ret < 0)
return ret;
if (cal == 0) {
dev_warn(dev, "chip not calibrated, reinitializing\n");
ret = ina2xx_init(data);
if (ret < 0)
return ret;
/*
* Let's make sure the power and current
* registers have been updated before trying
* again.
*/
msleep(INA2XX_MAX_DELAY);
continue;
}
}
return 0;
}
/*
* If we're here then although all write operations succeeded, the
* chip still returns 0 in the calibration register. Nothing more we
* can do here.
*/
dev_err(dev, "unable to reinitialize the chip\n");
return -ENODEV;
}
static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
unsigned int regval)
{
int val;
switch (reg) {
case INA2XX_SHUNT_VOLTAGE:
/* signed register */
val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
break;
case INA2XX_BUS_VOLTAGE:
val = (regval >> data->config->bus_voltage_shift)
* data->config->bus_voltage_lsb;
val = DIV_ROUND_CLOSEST(val, 1000);
break;
case INA2XX_POWER:
val = regval * data->power_lsb_uW;
break;
case INA2XX_CURRENT:
/* signed register, result in mA */
val = (s16)regval * data->current_lsb_uA;
val = DIV_ROUND_CLOSEST(val, 1000);
break;
case INA2XX_CALIBRATION:
val = regval;
break;
default:
/* programmer goofed */
WARN_ON_ONCE(1);
val = 0;
break;
}
return val;
}
static ssize_t ina2xx_value_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ina2xx_data *data = dev_get_drvdata(dev);
unsigned int regval;
int err = ina2xx_read_reg(dev, attr->index, &regval);
if (err < 0)
return err;
return snprintf(buf, PAGE_SIZE, "%d\n",
ina2xx_get_value(data, attr->index, regval));
}
static int ina226_reg_to_alert(struct ina2xx_data *data, u8 bit, u16 regval)
{
int reg;
switch (bit) {
case INA226_SHUNT_OVER_VOLTAGE_BIT:
case INA226_SHUNT_UNDER_VOLTAGE_BIT:
reg = INA2XX_SHUNT_VOLTAGE;
break;
case INA226_BUS_OVER_VOLTAGE_BIT:
case INA226_BUS_UNDER_VOLTAGE_BIT:
reg = INA2XX_BUS_VOLTAGE;
break;
case INA226_POWER_OVER_LIMIT_BIT:
reg = INA2XX_POWER;
break;
default:
/* programmer goofed */
WARN_ON_ONCE(1);
return 0;
}
return ina2xx_get_value(data, reg, regval);
}
/*
* Turns alert limit values into register values.
* Opposite of the formula in ina2xx_get_value().
*/
static s16 ina226_alert_to_reg(struct ina2xx_data *data, u8 bit, int val)
{
switch (bit) {
case INA226_SHUNT_OVER_VOLTAGE_BIT:
case INA226_SHUNT_UNDER_VOLTAGE_BIT:
val *= data->config->shunt_div;
return clamp_val(val, SHRT_MIN, SHRT_MAX);
case INA226_BUS_OVER_VOLTAGE_BIT:
case INA226_BUS_UNDER_VOLTAGE_BIT:
val = (val * 1000) << data->config->bus_voltage_shift;
val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);
return clamp_val(val, 0, SHRT_MAX);
case INA226_POWER_OVER_LIMIT_BIT:
val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);
return clamp_val(val, 0, USHRT_MAX);
default:
/* programmer goofed */
WARN_ON_ONCE(1);
return 0;
}
}
static ssize_t ina226_alert_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ina2xx_data *data = dev_get_drvdata(dev);
int regval;
int val = 0;
int ret;
mutex_lock(&data->config_lock);
ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
if (ret)
goto abort;
if (regval & BIT(attr->index)) {
ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);
if (ret)
goto abort;
val = ina226_reg_to_alert(data, attr->index, regval);
}
ret = snprintf(buf, PAGE_SIZE, "%d\n", val);
abort:
mutex_unlock(&data->config_lock);
return ret;
}
static ssize_t ina226_alert_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ina2xx_data *data = dev_get_drvdata(dev);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret < 0)
return ret;
/*
* Clear all alerts first to avoid accidentally triggering ALERT pin
* due to register write sequence. Then, only enable the alert
* if the value is non-zero.
*/
mutex_lock(&data->config_lock);
ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
INA226_ALERT_CONFIG_MASK, 0);
if (ret < 0)
goto abort;
ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,
ina226_alert_to_reg(data, attr->index, val));
if (ret < 0)
goto abort;
if (val != 0) {
ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
INA226_ALERT_CONFIG_MASK,
BIT(attr->index));
if (ret < 0)
goto abort;
}
ret = count;
abort:
mutex_unlock(&data->config_lock);
return ret;
}
static ssize_t ina226_alarm_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ina2xx_data *data = dev_get_drvdata(dev);
int regval;
int alarm = 0;
int ret;
ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
if (ret)
return ret;
alarm = (regval & BIT(attr->index)) &&
(regval & INA226_ALERT_FUNCTION_FLAG);
return snprintf(buf, PAGE_SIZE, "%d\n", alarm);
}
/*
* In order to keep calibration register value fixed, the product
* of current_lsb and shunt_resistor should also be fixed and equal
* to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
* to keep the scale.
*/
static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
{
unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
data->config->shunt_div);
if (val <= 0 || val > dividend)
return -EINVAL;
mutex_lock(&data->config_lock);
data->rshunt = val;
data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
data->power_lsb_uW = data->config->power_lsb_factor *
data->current_lsb_uA;
mutex_unlock(&data->config_lock);
return 0;
}
static ssize_t ina2xx_shunt_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct ina2xx_data *data = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);
}
static ssize_t ina2xx_shunt_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
unsigned long val;
int status;
struct ina2xx_data *data = dev_get_drvdata(dev);
status = kstrtoul(buf, 10, &val);
if (status < 0)
return status;
status = ina2xx_set_shunt(data, val);
if (status < 0)
return status;
return count;
}
static ssize_t ina226_interval_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct ina2xx_data *data = dev_get_drvdata(dev);
unsigned long val;
int status;
status = kstrtoul(buf, 10, &val);
if (status < 0)
return status;
if (val > INT_MAX || val == 0)
return -EINVAL;
status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
INA226_AVG_RD_MASK,
ina226_interval_to_reg(val));
if (status < 0)
return status;
return count;
}
static ssize_t ina226_interval_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct ina2xx_data *data = dev_get_drvdata(dev);
int status;
unsigned int regval;
status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);
if (status)
return status;
return snprintf(buf, PAGE_SIZE, "%d\n", ina226_reg_to_interval(regval));
}
/* shunt voltage */
static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
/* shunt voltage over/under voltage alert setting and alarm */
static SENSOR_DEVICE_ATTR_RW(in0_crit, ina226_alert,
INA226_SHUNT_OVER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RW(in0_lcrit, ina226_alert,
INA226_SHUNT_UNDER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RO(in0_crit_alarm, ina226_alarm,
INA226_SHUNT_OVER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RO(in0_lcrit_alarm, ina226_alarm,
INA226_SHUNT_UNDER_VOLTAGE_BIT);
/* bus voltage */
static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
/* bus voltage over/under voltage alert setting and alarm */
static SENSOR_DEVICE_ATTR_RW(in1_crit, ina226_alert,
INA226_BUS_OVER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RW(in1_lcrit, ina226_alert,
INA226_BUS_UNDER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RO(in1_crit_alarm, ina226_alarm,
INA226_BUS_OVER_VOLTAGE_BIT);
static SENSOR_DEVICE_ATTR_RO(in1_lcrit_alarm, ina226_alarm,
INA226_BUS_UNDER_VOLTAGE_BIT);
/* calculated current */
static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
/* calculated power */
static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
/* over-limit power alert setting and alarm */
static SENSOR_DEVICE_ATTR_RW(power1_crit, ina226_alert,
INA226_POWER_OVER_LIMIT_BIT);
static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina226_alarm,
INA226_POWER_OVER_LIMIT_BIT);
/* shunt resistance */
static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
/* update interval (ina226 only) */
static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
/* 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,
&sensor_dev_attr_shunt_resistor.dev_attr.attr,
NULL,
};
static const struct attribute_group ina2xx_group = {
.attrs = ina2xx_attrs,
};
static struct attribute *ina226_attrs[] = {
&sensor_dev_attr_in0_crit.dev_attr.attr,
&sensor_dev_attr_in0_lcrit.dev_attr.attr,
&sensor_dev_attr_in0_crit_alarm.dev_attr.attr,
&sensor_dev_attr_in0_lcrit_alarm.dev_attr.attr,
&sensor_dev_attr_in1_crit.dev_attr.attr,
&sensor_dev_attr_in1_lcrit.dev_attr.attr,
&sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_in1_lcrit_alarm.dev_attr.attr,
&sensor_dev_attr_power1_crit.dev_attr.attr,
&sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_update_interval.dev_attr.attr,
NULL,
};
static const struct attribute_group ina226_group = {
.attrs = ina226_attrs,
};
static const struct i2c_device_id ina2xx_id[];
static int ina2xx_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ina2xx_data *data;
struct device *hwmon_dev;
u32 val;
int ret, group = 0;
enum ina2xx_ids chip;
if (client->dev.of_node)
chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
else
chip = i2c_match_id(ina2xx_id, client)->driver_data;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
/* set the device type */
data->config = &ina2xx_config[chip];
mutex_init(&data->config_lock);
if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
if (pdata)
val = pdata->shunt_uohms;
else
val = INA2XX_RSHUNT_DEFAULT;
}
ina2xx_set_shunt(data, val);
ina2xx_regmap_config.max_register = data->config->registers;
data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
if (IS_ERR(data->regmap)) {
dev_err(dev, "failed to allocate register map\n");
return PTR_ERR(data->regmap);
}
ret = ina2xx_init(data);
if (ret < 0) {
dev_err(dev, "error configuring the device: %d\n", ret);
return -ENODEV;
}
data->groups[group++] = &ina2xx_group;
if (chip == ina226)
data->groups[group++] = &ina226_group;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, data->groups);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
client->name, data->rshunt);
return 0;
}
static const struct i2c_device_id ina2xx_id[] = {
{ "ina219", ina219 },
{ "ina220", ina219 },
{ "ina226", ina226 },
{ "ina230", ina226 },
{ "ina231", ina226 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ina2xx_id);
static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
{
.compatible = "ti,ina219",
.data = (void *)ina219
},
{
.compatible = "ti,ina220",
.data = (void *)ina219
},
{
.compatible = "ti,ina226",
.data = (void *)ina226
},
{
.compatible = "ti,ina230",
.data = (void *)ina226
},
{
.compatible = "ti,ina231",
.data = (void *)ina226
},
{ },
};
MODULE_DEVICE_TABLE(of, ina2xx_of_match);
static struct i2c_driver ina2xx_driver = {
.driver = {
.name = "ina2xx",
.of_match_table = of_match_ptr(ina2xx_of_match),
},
.probe_new = 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");
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