1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
new file mode 100644
index 000000000000..bcde8d13476a
--- /dev/null
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -0,0 +1,337 @@
+/*
+ *  Sysfs interface for the universal power supply monitor class
+ *
+ *  Copyright © 2007  David Woodhouse <dwmw2@infradead.org>
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+
+#include "power_supply.h"
+
+/*
+ * This is because the name "current" breaks the device attr macro.
+ * The "current" word resolves to "(get_current())" so instead of
+ * "current" "(get_current())" appears in the sysfs.
+ *
+ * The source of this definition is the device.h which calls __ATTR
+ * macro in sysfs.h which calls the __stringify macro.
+ *
+ * Only modification that the name is not tried to be resolved
+ * (as a macro let's say).
+ */
+
+#define POWER_SUPPLY_ATTR(_name)					\
+{									\
+	.attr = { .name = #_name },					\
+	.show = power_supply_show_property,				\
+	.store = power_supply_store_property,				\
+}
+
+static struct device_attribute power_supply_attrs[];
+
+static ssize_t power_supply_show_property(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf) {
+	static char *type_text[] = {
+		"Unknown", "Battery", "UPS", "Mains", "USB",
+		"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
+		"USB_PD", "USB_PD_DRP"
+	};
+	static char *status_text[] = {
+		"Unknown", "Charging", "Discharging", "Not charging", "Full"
+	};
+	static char *charge_type[] = {
+		"Unknown", "N/A", "Trickle", "Fast"
+	};
+	static char *health_text[] = {
+		"Unknown", "Good", "Overheat", "Dead", "Over voltage",
+		"Unspecified failure", "Cold", "Watchdog timer expire",
+		"Safety timer expire"
+	};
+	static char *technology_text[] = {
+		"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
+		"LiMn"
+	};
+	static char *capacity_level_text[] = {
+		"Unknown", "Critical", "Low", "Normal", "High", "Full"
+	};
+	static char *scope_text[] = {
+		"Unknown", "System", "Device"
+	};
+	ssize_t ret = 0;
+	struct power_supply *psy = dev_get_drvdata(dev);
+	const ptrdiff_t off = attr - power_supply_attrs;
+	union power_supply_propval value;
+
+	if (off == POWER_SUPPLY_PROP_TYPE) {
+		value.intval = psy->desc->type;
+	} else {
+		ret = power_supply_get_property(psy, off, &value);
+
+		if (ret < 0) {
+			if (ret == -ENODATA)
+				dev_dbg(dev, "driver has no data for `%s' property\n",
+					attr->attr.name);
+			else if (ret != -ENODEV && ret != -EAGAIN)
+				dev_err(dev, "driver failed to report `%s' property: %zd\n",
+					attr->attr.name, ret);
+			return ret;
+		}
+	}
+
+	if (off == POWER_SUPPLY_PROP_STATUS)
+		return sprintf(buf, "%s\n", status_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
+		return sprintf(buf, "%s\n", charge_type[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_HEALTH)
+		return sprintf(buf, "%s\n", health_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
+		return sprintf(buf, "%s\n", technology_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
+		return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_TYPE)
+		return sprintf(buf, "%s\n", type_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_SCOPE)
+		return sprintf(buf, "%s\n", scope_text[value.intval]);
+	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
+		return sprintf(buf, "%s\n", value.strval);
+
+	return sprintf(buf, "%d\n", value.intval);
+}
+
+static ssize_t power_supply_store_property(struct device *dev,
+					   struct device_attribute *attr,
+					   const char *buf, size_t count) {
+	ssize_t ret;
+	struct power_supply *psy = dev_get_drvdata(dev);
+	const ptrdiff_t off = attr - power_supply_attrs;
+	union power_supply_propval value;
+	long long_val;
+
+	/* TODO: support other types than int */
+	ret = kstrtol(buf, 10, &long_val);
+	if (ret < 0)
+		return ret;
+
+	value.intval = long_val;
+
+	ret = power_supply_set_property(psy, off, &value);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+/* Must be in the same order as POWER_SUPPLY_PROP_* */
+static struct device_attribute power_supply_attrs[] = {
+	/* Properties of type `int' */
+	POWER_SUPPLY_ATTR(status),
+	POWER_SUPPLY_ATTR(charge_type),
+	POWER_SUPPLY_ATTR(health),
+	POWER_SUPPLY_ATTR(present),
+	POWER_SUPPLY_ATTR(online),
+	POWER_SUPPLY_ATTR(authentic),
+	POWER_SUPPLY_ATTR(technology),
+	POWER_SUPPLY_ATTR(cycle_count),
+	POWER_SUPPLY_ATTR(voltage_max),
+	POWER_SUPPLY_ATTR(voltage_min),
+	POWER_SUPPLY_ATTR(voltage_max_design),
+	POWER_SUPPLY_ATTR(voltage_min_design),
+	POWER_SUPPLY_ATTR(voltage_now),
+	POWER_SUPPLY_ATTR(voltage_avg),
+	POWER_SUPPLY_ATTR(voltage_ocv),
+	POWER_SUPPLY_ATTR(voltage_boot),
+	POWER_SUPPLY_ATTR(current_max),
+	POWER_SUPPLY_ATTR(current_now),
+	POWER_SUPPLY_ATTR(current_avg),
+	POWER_SUPPLY_ATTR(current_boot),
+	POWER_SUPPLY_ATTR(power_now),
+	POWER_SUPPLY_ATTR(power_avg),
+	POWER_SUPPLY_ATTR(charge_full_design),
+	POWER_SUPPLY_ATTR(charge_empty_design),
+	POWER_SUPPLY_ATTR(charge_full),
+	POWER_SUPPLY_ATTR(charge_empty),
+	POWER_SUPPLY_ATTR(charge_now),
+	POWER_SUPPLY_ATTR(charge_avg),
+	POWER_SUPPLY_ATTR(charge_counter),
+	POWER_SUPPLY_ATTR(constant_charge_current),
+	POWER_SUPPLY_ATTR(constant_charge_current_max),
+	POWER_SUPPLY_ATTR(constant_charge_voltage),
+	POWER_SUPPLY_ATTR(constant_charge_voltage_max),
+	POWER_SUPPLY_ATTR(charge_control_limit),
+	POWER_SUPPLY_ATTR(charge_control_limit_max),
+	POWER_SUPPLY_ATTR(input_current_limit),
+	POWER_SUPPLY_ATTR(energy_full_design),
+	POWER_SUPPLY_ATTR(energy_empty_design),
+	POWER_SUPPLY_ATTR(energy_full),
+	POWER_SUPPLY_ATTR(energy_empty),
+	POWER_SUPPLY_ATTR(energy_now),
+	POWER_SUPPLY_ATTR(energy_avg),
+	POWER_SUPPLY_ATTR(capacity),
+	POWER_SUPPLY_ATTR(capacity_alert_min),
+	POWER_SUPPLY_ATTR(capacity_alert_max),
+	POWER_SUPPLY_ATTR(capacity_level),
+	POWER_SUPPLY_ATTR(temp),
+	POWER_SUPPLY_ATTR(temp_max),
+	POWER_SUPPLY_ATTR(temp_min),
+	POWER_SUPPLY_ATTR(temp_alert_min),
+	POWER_SUPPLY_ATTR(temp_alert_max),
+	POWER_SUPPLY_ATTR(temp_ambient),
+	POWER_SUPPLY_ATTR(temp_ambient_alert_min),
+	POWER_SUPPLY_ATTR(temp_ambient_alert_max),
+	POWER_SUPPLY_ATTR(time_to_empty_now),
+	POWER_SUPPLY_ATTR(time_to_empty_avg),
+	POWER_SUPPLY_ATTR(time_to_full_now),
+	POWER_SUPPLY_ATTR(time_to_full_avg),
+	POWER_SUPPLY_ATTR(type),
+	POWER_SUPPLY_ATTR(scope),
+	POWER_SUPPLY_ATTR(charge_term_current),
+	POWER_SUPPLY_ATTR(calibrate),
+	/* Properties of type `const char *' */
+	POWER_SUPPLY_ATTR(model_name),
+	POWER_SUPPLY_ATTR(manufacturer),
+	POWER_SUPPLY_ATTR(serial_number),
+};
+
+static struct attribute *
+__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
+
+static umode_t power_supply_attr_is_visible(struct kobject *kobj,
+					   struct attribute *attr,
+					   int attrno)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct power_supply *psy = dev_get_drvdata(dev);
+	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
+	int i;
+
+	if (attrno == POWER_SUPPLY_PROP_TYPE)
+		return mode;
+
+	for (i = 0; i < psy->desc->num_properties; i++) {
+		int property = psy->desc->properties[i];
+
+		if (property == attrno) {
+			if (psy->desc->property_is_writeable &&
+			    psy->desc->property_is_writeable(psy, property) > 0)
+				mode |= S_IWUSR;
+
+			return mode;
+		}
+	}
+
+	return 0;
+}
+
+static struct attribute_group power_supply_attr_group = {
+	.attrs = __power_supply_attrs,
+	.is_visible = power_supply_attr_is_visible,
+};
+
+static const struct attribute_group *power_supply_attr_groups[] = {
+	&power_supply_attr_group,
+	NULL,
+};
+
+void power_supply_init_attrs(struct device_type *dev_type)
+{
+	int i;
+
+	dev_type->groups = power_supply_attr_groups;
+
+	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
+		__power_supply_attrs[i] = &power_supply_attrs[i].attr;
+}
+
+static char *kstruprdup(const char *str, gfp_t gfp)
+{
+	char *ret, *ustr;
+
+	ustr = ret = kmalloc(strlen(str) + 1, gfp);
+
+	if (!ret)
+		return NULL;
+
+	while (*str)
+		*ustr++ = toupper(*str++);
+
+	*ustr = 0;
+
+	return ret;
+}
+
+int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct power_supply *psy = dev_get_drvdata(dev);
+	int ret = 0, j;
+	char *prop_buf;
+	char *attrname;
+
+	dev_dbg(dev, "uevent\n");
+
+	if (!psy || !psy->desc) {
+		dev_dbg(dev, "No power supply yet\n");
+		return ret;
+	}
+
+	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name);
+
+	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
+	if (ret)
+		return ret;
+
+	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
+	if (!prop_buf)
+		return -ENOMEM;
+
+	for (j = 0; j < psy->desc->num_properties; j++) {
+		struct device_attribute *attr;
+		char *line;
+
+		attr = &power_supply_attrs[psy->desc->properties[j]];
+
+		ret = power_supply_show_property(dev, attr, prop_buf);
+		if (ret == -ENODEV || ret == -ENODATA) {
+			/* When a battery is absent, we expect -ENODEV. Don't abort;
+			   send the uevent with at least the the PRESENT=0 property */
+			ret = 0;
+			continue;
+		}
+
+		if (ret < 0)
+			goto out;
+
+		line = strchr(prop_buf, '\n');
+		if (line)
+			*line = 0;
+
+		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
+		if (!attrname) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
+
+		ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
+		kfree(attrname);
+		if (ret)
+			goto out;
+	}
+
+out:
+	free_page((unsigned long)prop_buf);
+
+	return ret;
+}