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linux/drivers/hwmon/isl28022.c
Yikai Tsai 39671a14df hwmon: (isl28022) new driver for ISL28022 power monitor 
Driver for Renesas ISL28022 power monitor with I2C interface.
The device monitors voltage, current via shunt resistor
and calculated power.

Signed-off-by: Carsten Spieß <mail@carsten-spiess.de>
Signed-off-by: Yikai Tsai <yikai.tsai.wiwynn@gmail.com>
Message-ID: <20241002081133.13123-3-yikai.tsai.wiwynn@gmail.com>
[groeck: Fixed alignment issues, dropped noise at end of probe]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-11-10 14:48:07 -08:00

536 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* isl28022.c - driver for Renesas ISL28022 power monitor chip monitoring
*
* Copyright (c) 2023 Carsten Spieß <mail@carsten-spiess.de>
*/
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
/* ISL28022 registers */
#define ISL28022_REG_CONFIG 0x00
#define ISL28022_REG_SHUNT 0x01
#define ISL28022_REG_BUS 0x02
#define ISL28022_REG_POWER 0x03
#define ISL28022_REG_CURRENT 0x04
#define ISL28022_REG_CALIB 0x05
#define ISL28022_REG_SHUNT_THR 0x06
#define ISL28022_REG_BUS_THR 0x07
#define ISL28022_REG_INT 0x08
#define ISL28022_REG_AUX 0x09
#define ISL28022_REG_MAX ISL28022_REG_AUX
/* ISL28022 config flags */
/* mode flags */
#define ISL28022_MODE_SHIFT 0
#define ISL28022_MODE_MASK 0x0007
#define ISL28022_MODE_PWR_DOWN 0x0
#define ISL28022_MODE_TRG_S 0x1
#define ISL28022_MODE_TRG_B 0x2
#define ISL28022_MODE_TRG_SB 0x3
#define ISL28022_MODE_ADC_OFF 0x4
#define ISL28022_MODE_CONT_S 0x5
#define ISL28022_MODE_CONT_B 0x6
#define ISL28022_MODE_CONT_SB 0x7
/* shunt ADC settings */
#define ISL28022_SADC_SHIFT 3
#define ISL28022_SADC_MASK 0x0078
#define ISL28022_BADC_SHIFT 7
#define ISL28022_BADC_MASK 0x0780
#define ISL28022_ADC_12 0x0 /* 12 bit ADC */
#define ISL28022_ADC_13 0x1 /* 13 bit ADC */
#define ISL28022_ADC_14 0x2 /* 14 bit ADC */
#define ISL28022_ADC_15 0x3 /* 15 bit ADC */
#define ISL28022_ADC_15_1 0x8 /* 15 bit ADC, 1 sample */
#define ISL28022_ADC_15_2 0x9 /* 15 bit ADC, 2 samples */
#define ISL28022_ADC_15_4 0xA /* 15 bit ADC, 4 samples */
#define ISL28022_ADC_15_8 0xB /* 15 bit ADC, 8 samples */
#define ISL28022_ADC_15_16 0xC /* 15 bit ADC, 16 samples */
#define ISL28022_ADC_15_32 0xD /* 15 bit ADC, 32 samples */
#define ISL28022_ADC_15_64 0xE /* 15 bit ADC, 64 samples */
#define ISL28022_ADC_15_128 0xF /* 15 bit ADC, 128 samples */
/* shunt voltage range */
#define ISL28022_PG_SHIFT 11
#define ISL28022_PG_MASK 0x1800
#define ISL28022_PG_40 0x0 /* +/-40 mV */
#define ISL28022_PG_80 0x1 /* +/-80 mV */
#define ISL28022_PG_160 0x2 /* +/-160 mV */
#define ISL28022_PG_320 0x3 /* +/-3200 mV */
/* bus voltage range */
#define ISL28022_BRNG_SHIFT 13
#define ISL28022_BRNG_MASK 0x6000
#define ISL28022_BRNG_16 0x0 /* 16 V */
#define ISL28022_BRNG_32 0x1 /* 32 V */
#define ISL28022_BRNG_60 0x3 /* 60 V */
/* reset */
#define ISL28022_RESET 0x8000
struct isl28022_data {
struct regmap *regmap;
u32 shunt;
u32 gain;
u32 average;
};
static int isl28022_read_in(struct device *dev, u32 attr, int channel, long *val)
{
struct isl28022_data *data = dev_get_drvdata(dev);
unsigned int regval;
int err;
u16 sign_bit;
switch (channel) {
case 0:
switch (attr) {
case hwmon_in_input:
err = regmap_read(data->regmap,
ISL28022_REG_BUS, &regval);
if (err < 0)
return err;
/* driver supports only 60V mode (BRNG 11) */
*val = (long)(((u16)regval) & 0xFFFC);
break;
default:
return -EOPNOTSUPP;
}
break;
case 1:
switch (attr) {
case hwmon_in_input:
err = regmap_read(data->regmap,
ISL28022_REG_SHUNT, &regval);
if (err < 0)
return err;
switch (data->gain) {
case 8:
sign_bit = (regval >> 15) & 0x01;
*val = (long)((((u16)regval) & 0x7FFF) -
(sign_bit * 32768)) / 100;
break;
case 4:
sign_bit = (regval >> 14) & 0x01;
*val = (long)((((u16)regval) & 0x3FFF) -
(sign_bit * 16384)) / 100;
break;
case 2:
sign_bit = (regval >> 13) & 0x01;
*val = (long)((((u16)regval) & 0x1FFF) -
(sign_bit * 8192)) / 100;
break;
case 1:
sign_bit = (regval >> 12) & 0x01;
*val = (long)((((u16)regval) & 0x0FFF) -
(sign_bit * 4096)) / 100;
break;
}
break;
default:
return -EOPNOTSUPP;
}
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int isl28022_read_current(struct device *dev, u32 attr, long *val)
{
struct isl28022_data *data = dev_get_drvdata(dev);
unsigned int regval;
int err;
switch (attr) {
case hwmon_curr_input:
err = regmap_read(data->regmap,
ISL28022_REG_CURRENT, &regval);
if (err < 0)
return err;
*val = ((long)regval * 1250L * (long)data->gain) /
(long)data->shunt;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int isl28022_read_power(struct device *dev, u32 attr, long *val)
{
struct isl28022_data *data = dev_get_drvdata(dev);
unsigned int regval;
int err;
switch (attr) {
case hwmon_power_input:
err = regmap_read(data->regmap,
ISL28022_REG_POWER, &regval);
if (err < 0)
return err;
*val = ((51200000L * ((long)data->gain)) /
(long)data->shunt) * (long)regval;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int isl28022_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_in:
return isl28022_read_in(dev, attr, channel, val);
case hwmon_curr:
return isl28022_read_current(dev, attr, val);
case hwmon_power:
return isl28022_read_power(dev, attr, val);
default:
return -EOPNOTSUPP;
}
return 0;
}
static umode_t isl28022_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_in:
switch (attr) {
case hwmon_in_input:
return 0444;
default:
break;
}
break;
case hwmon_curr:
switch (attr) {
case hwmon_curr_input:
return 0444;
default:
break;
}
break;
case hwmon_power:
switch (attr) {
case hwmon_power_input:
return 0444;
default:
break;
}
break;
default:
break;
}
return 0;
}
static const struct hwmon_channel_info *isl28022_info[] = {
HWMON_CHANNEL_INFO(in,
HWMON_I_INPUT, /* channel 0: bus voltage (mV) */
HWMON_I_INPUT), /* channel 1: shunt voltage (mV) */
HWMON_CHANNEL_INFO(curr,
HWMON_C_INPUT), /* channel 1: current (mA) */
HWMON_CHANNEL_INFO(power,
HWMON_P_INPUT), /* channel 1: power (µW) */
NULL
};
static const struct hwmon_ops isl28022_hwmon_ops = {
.is_visible = isl28022_is_visible,
.read = isl28022_read,
};
static const struct hwmon_chip_info isl28022_chip_info = {
.ops = &isl28022_hwmon_ops,
.info = isl28022_info,
};
static bool isl28022_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case ISL28022_REG_CONFIG:
case ISL28022_REG_CALIB:
case ISL28022_REG_SHUNT_THR:
case ISL28022_REG_BUS_THR:
case ISL28022_REG_INT:
case ISL28022_REG_AUX:
return true;
}
return false;
}
static bool isl28022_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case ISL28022_REG_CONFIG:
case ISL28022_REG_SHUNT:
case ISL28022_REG_BUS:
case ISL28022_REG_POWER:
case ISL28022_REG_CURRENT:
case ISL28022_REG_INT:
case ISL28022_REG_AUX:
return true;
}
return true;
}
static const struct regmap_config isl28022_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = ISL28022_REG_MAX,
.writeable_reg = isl28022_is_writeable_reg,
.volatile_reg = isl28022_is_volatile_reg,
.val_format_endian = REGMAP_ENDIAN_BIG,
.cache_type = REGCACHE_RBTREE,
.use_single_read = true,
.use_single_write = true,
};
static int shunt_voltage_show(struct seq_file *seqf, void *unused)
{
struct isl28022_data *data = seqf->private;
unsigned int regval;
int err;
err = regmap_read(data->regmap,
ISL28022_REG_SHUNT, &regval);
if (err)
return err;
/* print shunt voltage in micro volt */
seq_printf(seqf, "%d\n", regval * 10);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(shunt_voltage);
static struct dentry *isl28022_debugfs_root;
static void isl28022_debugfs_remove(void *res)
{
debugfs_remove_recursive(res);
}
static void isl28022_debugfs_init(struct i2c_client *client, struct isl28022_data *data)
{
char name[16];
struct dentry *debugfs;
scnprintf(name, sizeof(name), "%d-%04hx", client->adapter->nr, client->addr);
debugfs = debugfs_create_dir(name, isl28022_debugfs_root);
debugfs_create_file("shunt_voltage", 0444, debugfs, data, &shunt_voltage_fops);
devm_add_action_or_reset(&client->dev, isl28022_debugfs_remove, debugfs);
}
/*
* read property values and make consistency checks.
*
* following values for shunt range and resistor are allowed:
* 40 mV -> gain 1, shunt min. 800 micro ohms
* 80 mV -> gain 2, shunt min. 1600 micro ohms
* 160 mV -> gain 4, shunt min. 3200 micro ohms
* 320 mV -> gain 8, shunt min. 6400 micro ohms
*/
static int isl28022_read_properties(struct device *dev, struct isl28022_data *data)
{
u32 val;
int err;
err = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
if (err == -EINVAL)
val = 10000;
else if (err < 0)
return err;
data->shunt = val;
err = device_property_read_u32(dev, "renesas,shunt-range-microvolt", &val);
if (err == -EINVAL)
val = 320000;
else if (err < 0)
return err;
switch (val) {
case 40000:
data->gain = 1;
if (data->shunt < 800)
goto shunt_invalid;
break;
case 80000:
data->gain = 2;
if (data->shunt < 1600)
goto shunt_invalid;
break;
case 160000:
data->gain = 4;
if (data->shunt < 3200)
goto shunt_invalid;
break;
case 320000:
data->gain = 8;
if (data->shunt < 6400)
goto shunt_invalid;
break;
default:
return dev_err_probe(dev, -EINVAL,
"renesas,shunt-range-microvolt invalid value %d\n",
val);
}
err = device_property_read_u32(dev, "renesas,average-samples", &val);
if (err == -EINVAL)
val = 1;
else if (err < 0)
return err;
if (val > 128 || hweight32(val) != 1)
return dev_err_probe(dev, -EINVAL,
"renesas,average-samples invalid value %d\n",
val);
data->average = val;
return 0;
shunt_invalid:
return dev_err_probe(dev, -EINVAL,
"renesas,shunt-resistor-microvolt invalid value %d\n",
data->shunt);
}
/*
* write configuration and calibration registers
*
* The driver supports only shunt and bus continuous ADC mode at 15bit resolution
* with averaging from 1 to 128 samples (pow of 2) on both channels.
* Shunt voltage gain 1,2,4 or 8 is allowed.
* The bus voltage range is 60V fixed.
*/
static int isl28022_config(struct isl28022_data *data)
{
int err;
u16 config;
u16 calib;
config = (ISL28022_MODE_CONT_SB << ISL28022_MODE_SHIFT) |
(ISL28022_BRNG_60 << ISL28022_BRNG_SHIFT) |
(__ffs(data->gain) << ISL28022_PG_SHIFT) |
((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_SADC_SHIFT) |
((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_BADC_SHIFT);
calib = data->shunt ? 0x8000 / data->gain : 0;
err = regmap_write(data->regmap, ISL28022_REG_CONFIG, config);
if (err < 0)
return err;
return regmap_write(data->regmap, ISL28022_REG_CALIB, calib);
}
static int isl28022_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct isl28022_data *data;
int err;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(struct isl28022_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
err = isl28022_read_properties(dev, data);
if (err)
return err;
data->regmap = devm_regmap_init_i2c(client, &isl28022_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
err = isl28022_config(data);
if (err)
return err;
isl28022_debugfs_init(client, data);
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &isl28022_chip_info, NULL);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
return 0;
}
static const struct i2c_device_id isl28022_ids[] = {
{ "isl28022", 0},
{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, isl28022_ids);
static const struct of_device_id __maybe_unused isl28022_of_match[] = {
{ .compatible = "renesas,isl28022"},
{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(of, isl28022_of_match);
static struct i2c_driver isl28022_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "isl28022",
},
.probe = isl28022_probe,
.id_table = isl28022_ids,
};
static int __init
isl28022_init(void)
{
int err;
isl28022_debugfs_root = debugfs_create_dir("isl28022", NULL);
err = i2c_add_driver(&isl28022_driver);
if (!err)
return 0;
debugfs_remove_recursive(isl28022_debugfs_root);
return err;
}
static void __exit
isl28022_exit(void)
{
i2c_del_driver(&isl28022_driver);
debugfs_remove_recursive(isl28022_debugfs_root);
}
module_init(isl28022_init);
module_exit(isl28022_exit);
MODULE_AUTHOR("Carsten Spieß <mail@carsten-spiess.de>");
MODULE_DESCRIPTION("ISL28022 driver");
MODULE_LICENSE("GPL");
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