blob: a48aa4afb828dba652655db6cd4783f93a4e9d23 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* power_supply_hwmon.c - power supply hwmon support.
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
struct power_supply_hwmon {
struct power_supply *psy;
unsigned long *props;
};
static const char *const ps_temp_label[] = {
"temp",
"ambient temp",
};
static int power_supply_hwmon_in_to_property(u32 attr)
{
switch (attr) {
case hwmon_in_average:
return POWER_SUPPLY_PROP_VOLTAGE_AVG;
case hwmon_in_min:
return POWER_SUPPLY_PROP_VOLTAGE_MIN;
case hwmon_in_max:
return POWER_SUPPLY_PROP_VOLTAGE_MAX;
case hwmon_in_input:
return POWER_SUPPLY_PROP_VOLTAGE_NOW;
default:
return -EINVAL;
}
}
static int power_supply_hwmon_curr_to_property(u32 attr)
{
switch (attr) {
case hwmon_curr_average:
return POWER_SUPPLY_PROP_CURRENT_AVG;
case hwmon_curr_max:
return POWER_SUPPLY_PROP_CURRENT_MAX;
case hwmon_curr_input:
return POWER_SUPPLY_PROP_CURRENT_NOW;
default:
return -EINVAL;
}
}
static int power_supply_hwmon_temp_to_property(u32 attr, int channel)
{
if (channel) {
switch (attr) {
case hwmon_temp_input:
return POWER_SUPPLY_PROP_TEMP_AMBIENT;
case hwmon_temp_min_alarm:
return POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN;
case hwmon_temp_max_alarm:
return POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX;
default:
break;
}
} else {
switch (attr) {
case hwmon_temp_input:
return POWER_SUPPLY_PROP_TEMP;
case hwmon_temp_max:
return POWER_SUPPLY_PROP_TEMP_MAX;
case hwmon_temp_min:
return POWER_SUPPLY_PROP_TEMP_MIN;
case hwmon_temp_min_alarm:
return POWER_SUPPLY_PROP_TEMP_ALERT_MIN;
case hwmon_temp_max_alarm:
return POWER_SUPPLY_PROP_TEMP_ALERT_MAX;
default:
break;
}
}
return -EINVAL;
}
static int
power_supply_hwmon_to_property(enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_in:
return power_supply_hwmon_in_to_property(attr);
case hwmon_curr:
return power_supply_hwmon_curr_to_property(attr);
case hwmon_temp:
return power_supply_hwmon_temp_to_property(attr, channel);
default:
return -EINVAL;
}
}
static bool power_supply_hwmon_is_a_label(enum hwmon_sensor_types type,
u32 attr)
{
return type == hwmon_temp && attr == hwmon_temp_label;
}
struct hwmon_type_attr_list {
const u32 *attrs;
size_t n_attrs;
};
static const u32 ps_temp_attrs[] = {
hwmon_temp_input,
hwmon_temp_min, hwmon_temp_max,
hwmon_temp_min_alarm, hwmon_temp_max_alarm,
};
static const struct hwmon_type_attr_list ps_type_attrs[hwmon_max] = {
[hwmon_temp] = { ps_temp_attrs, ARRAY_SIZE(ps_temp_attrs) },
};
static bool power_supply_hwmon_has_input(
const struct power_supply_hwmon *psyhw,
enum hwmon_sensor_types type, int channel)
{
const struct hwmon_type_attr_list *attr_list = &ps_type_attrs[type];
size_t i;
for (i = 0; i < attr_list->n_attrs; ++i) {
int prop = power_supply_hwmon_to_property(type,
attr_list->attrs[i], channel);
if (prop >= 0 && test_bit(prop, psyhw->props))
return true;
}
return false;
}
static bool power_supply_hwmon_is_writable(enum hwmon_sensor_types type,
u32 attr)
{
switch (type) {
case hwmon_in:
return attr == hwmon_in_min ||
attr == hwmon_in_max;
case hwmon_curr:
return attr == hwmon_curr_max;
case hwmon_temp:
return attr == hwmon_temp_max ||
attr == hwmon_temp_min ||
attr == hwmon_temp_min_alarm ||
attr == hwmon_temp_max_alarm;
default:
return false;
}
}
static umode_t power_supply_hwmon_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct power_supply_hwmon *psyhw = data;
int prop;
if (power_supply_hwmon_is_a_label(type, attr)) {
if (power_supply_hwmon_has_input(psyhw, type, channel))
return 0444;
else
return 0;
}
prop = power_supply_hwmon_to_property(type, attr, channel);
if (prop < 0 || !test_bit(prop, psyhw->props))
return 0;
if (power_supply_property_is_writeable(psyhw->psy, prop) > 0 &&
power_supply_hwmon_is_writable(type, attr))
return 0644;
return 0444;
}
static int power_supply_hwmon_read_string(struct device *dev,
enum hwmon_sensor_types type,
u32 attr, int channel,
const char **str)
{
switch (type) {
case hwmon_temp:
*str = ps_temp_label[channel];
break;
default:
/* unreachable, but see:
* gcc bug #51513 [1] and clang bug #978 [2]
*
* [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51513
* [2] https://github.com/ClangBuiltLinux/linux/issues/978
*/
break;
}
return 0;
}
static int
power_supply_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct power_supply_hwmon *psyhw = dev_get_drvdata(dev);
struct power_supply *psy = psyhw->psy;
union power_supply_propval pspval;
int ret, prop;
prop = power_supply_hwmon_to_property(type, attr, channel);
if (prop < 0)
return prop;
ret = power_supply_get_property(psy, prop, &pspval);
if (ret)
return ret;
switch (type) {
/*
* Both voltage and current is reported in units of
* microvolts/microamps, so we need to adjust it to
* milliamps(volts)
*/
case hwmon_curr:
case hwmon_in:
pspval.intval = DIV_ROUND_CLOSEST(pspval.intval, 1000);
break;
/*
* Temp needs to be converted from 1/10 C to milli-C
*/
case hwmon_temp:
if (check_mul_overflow(pspval.intval, 100,
&pspval.intval))
return -EOVERFLOW;
break;
default:
return -EINVAL;
}
*val = pspval.intval;
return 0;
}
static int
power_supply_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct power_supply_hwmon *psyhw = dev_get_drvdata(dev);
struct power_supply *psy = psyhw->psy;
union power_supply_propval pspval;
int prop;
prop = power_supply_hwmon_to_property(type, attr, channel);
if (prop < 0)
return prop;
pspval.intval = val;
switch (type) {
/*
* Both voltage and current is reported in units of
* microvolts/microamps, so we need to adjust it to
* milliamps(volts)
*/
case hwmon_curr:
case hwmon_in:
if (check_mul_overflow(pspval.intval, 1000,
&pspval.intval))
return -EOVERFLOW;
break;
/*
* Temp needs to be converted from 1/10 C to milli-C
*/
case hwmon_temp:
pspval.intval = DIV_ROUND_CLOSEST(pspval.intval, 100);
break;
default:
return -EINVAL;
}
return power_supply_set_property(psy, prop, &pspval);
}
static const struct hwmon_ops power_supply_hwmon_ops = {
.is_visible = power_supply_hwmon_is_visible,
.read = power_supply_hwmon_read,
.write = power_supply_hwmon_write,
.read_string = power_supply_hwmon_read_string,
};
static const struct hwmon_channel_info *power_supply_hwmon_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_LABEL |
HWMON_T_INPUT |
HWMON_T_MAX |
HWMON_T_MIN |
HWMON_T_MIN_ALARM,
HWMON_T_LABEL |
HWMON_T_INPUT |
HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM),
HWMON_CHANNEL_INFO(curr,
HWMON_C_AVERAGE |
HWMON_C_MAX |
HWMON_C_INPUT),
HWMON_CHANNEL_INFO(in,
HWMON_I_AVERAGE |
HWMON_I_MIN |
HWMON_I_MAX |
HWMON_I_INPUT),
NULL
};
static const struct hwmon_chip_info power_supply_hwmon_chip_info = {
.ops = &power_supply_hwmon_ops,
.info = power_supply_hwmon_info,
};
int power_supply_add_hwmon_sysfs(struct power_supply *psy)
{
const struct power_supply_desc *desc = psy->desc;
struct power_supply_hwmon *psyhw;
struct device *dev = &psy->dev;
struct device *hwmon;
int ret, i;
const char *name;
if (!devres_open_group(dev, power_supply_add_hwmon_sysfs,
GFP_KERNEL))
return -ENOMEM;
psyhw = devm_kzalloc(dev, sizeof(*psyhw), GFP_KERNEL);
if (!psyhw) {
ret = -ENOMEM;
goto error;
}
psyhw->psy = psy;
psyhw->props = devm_bitmap_zalloc(dev,
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG + 1,
GFP_KERNEL);
if (!psyhw->props) {
ret = -ENOMEM;
goto error;
}
for (i = 0; i < desc->num_properties; i++) {
const enum power_supply_property prop = desc->properties[i];
switch (prop) {
case POWER_SUPPLY_PROP_CURRENT_AVG:
case POWER_SUPPLY_PROP_CURRENT_MAX:
case POWER_SUPPLY_PROP_CURRENT_NOW:
case POWER_SUPPLY_PROP_TEMP:
case POWER_SUPPLY_PROP_TEMP_MAX:
case POWER_SUPPLY_PROP_TEMP_MIN:
case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
case POWER_SUPPLY_PROP_TEMP_AMBIENT:
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
set_bit(prop, psyhw->props);
break;
default:
break;
}
}
name = psy->desc->name;
if (strchr(name, '-')) {
char *new_name;
new_name = devm_kstrdup(dev, name, GFP_KERNEL);
if (!new_name) {
ret = -ENOMEM;
goto error;
}
strreplace(new_name, '-', '_');
name = new_name;
}
hwmon = devm_hwmon_device_register_with_info(dev, name,
psyhw,
&power_supply_hwmon_chip_info,
NULL);
ret = PTR_ERR_OR_ZERO(hwmon);
if (ret)
goto error;
devres_close_group(dev, power_supply_add_hwmon_sysfs);
return 0;
error:
devres_release_group(dev, NULL);
return ret;
}
void power_supply_remove_hwmon_sysfs(struct power_supply *psy)
{
devres_release_group(&psy->dev, power_supply_add_hwmon_sysfs);
}