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power: supply: Add HWMON compatibility layer

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Add code implementing HWMON adapter/compatibility layer to allow
expositing various sensors present on power supply devices via HWMON
subsystem. This is done in order to allow userspace to use single
ABI/library(libsensors) to access/manipulate all of the sensors of the
system.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Chris Healy <cphealy@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Andrey Smirnov 2019-06-12 01:44:04 -07:00 committed by Sebastian Reichel
parent 22ee8384dc
commit e67d4dfc9f
5 changed files with 390 additions and 0 deletions
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14
drivers/power/supply/Kconfig
View File

@ -14,6 +14,20 @@ config POWER_SUPPLY_DEBUG
Say Y here to enable debugging messages for power supply class
and drivers.
config POWER_SUPPLY_HWMON
bool
prompt "Expose power supply sensors as hwmon device"
depends on HWMON=y || HWMON=POWER_SUPPLY
default y
help
This options enables API that allows sensors found on a
power supply device (current, voltage, temperature) to be
exposed as a hwmon device.
Say 'Y' here if you want power supplies to
have hwmon sysfs interface too.
config PDA_POWER
tristate "Generic PDA/phone power driver"
depends on !S390

1
drivers/power/supply/Makefile
View File

@ -6,6 +6,7 @@ power_supply-$(CONFIG_SYSFS) += power_supply_sysfs.o
power_supply-$(CONFIG_LEDS_TRIGGERS) += power_supply_leds.o
obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
obj-$(CONFIG_PDA_POWER) += pda_power.o

7
drivers/power/supply/power_supply_core.c
View File

@ -1072,6 +1072,10 @@ __power_supply_register(struct device *parent,
if (rc)
goto create_triggers_failed;
rc = power_supply_add_hwmon_sysfs(psy);
if (rc)
goto add_hwmon_sysfs_failed;
/*
* Update use_cnt after any uevents (most notably from device_add()).
* We are here still during driver's probe but
@ -1090,6 +1094,8 @@ __power_supply_register(struct device *parent,
return psy;
add_hwmon_sysfs_failed:
power_supply_remove_triggers(psy);
create_triggers_failed:
psy_unregister_cooler(psy);
register_cooler_failed:
@ -1242,6 +1248,7 @@ void power_supply_unregister(struct power_supply *psy)
cancel_work_sync(&psy->changed_work);
cancel_delayed_work_sync(&psy->deferred_register_work);
sysfs_remove_link(&psy->dev.kobj, "powers");
power_supply_remove_hwmon_sysfs(psy);
power_supply_remove_triggers(psy);
psy_unregister_cooler(psy);
psy_unregister_thermal(psy);

355
drivers/power/supply/power_supply_hwmon.c Normal file
View File

@ -0,0 +1,355 @@
// 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 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;
}
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))
return 0444;
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)
{
*str = channel ? "temp" : "temp ambient";
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_MIN_ALARM,
HWMON_T_LABEL |
HWMON_T_INPUT |
HWMON_T_MIN_ALARM |
HWMON_T_LABEL |
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,
};
static void power_supply_hwmon_bitmap_free(void *data)
{
bitmap_free(data);
}
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;
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 = bitmap_zalloc(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG + 1,
GFP_KERNEL);
if (!psyhw->props) {
ret = -ENOMEM;
goto error;
}
ret = devm_add_action(dev, power_supply_hwmon_bitmap_free,
psyhw->props);
if (ret)
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;
}
}
hwmon = devm_hwmon_device_register_with_info(dev, psy->desc->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);
}

13
include/linux/power_supply.h
View File

@ -481,4 +481,17 @@ static inline bool power_supply_is_watt_property(enum power_supply_property psp)
return 0;
}
#ifdef CONFIG_POWER_SUPPLY_HWMON
int power_supply_add_hwmon_sysfs(struct power_supply *psy);
void power_supply_remove_hwmon_sysfs(struct power_supply *psy);
#else
static inline int power_supply_add_hwmon_sysfs(struct power_supply *psy)
{
return 0;
}
static inline
void power_supply_remove_hwmon_sysfs(struct power_supply *psy) {}
#endif
#endif /* __LINUX_POWER_SUPPLY_H__ */