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path: root/drivers/power/supply/power_supply_hwmon.c
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Diffstat (limited to 'drivers/power/supply/power_supply_hwmon.c')
-rw-r--r--drivers/power/supply/power_supply_hwmon.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
new file mode 100644
index 000000000..a48aa4afb
--- /dev/null
+++ b/drivers/power/supply/power_supply_hwmon.c
@@ -0,0 +1,411 @@
+// 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);
+}