--- /dev/null
+/*
+ * 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"
+ };
+ 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)
+ 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 = psy->desc->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 &&
+ power_supply_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;
+}
Code Review / kvmfornfv.git / blobdiff