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