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-rw-r--r--drivers/power/power_supply_core.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
new file mode 100644
index 000000000000..e87ea5156755
--- /dev/null
+++ b/drivers/power/power_supply_core.c
@@ -0,0 +1,168 @@
+/*
+ * Universal power supply monitor class
+ *
+ * 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/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include "power_supply.h"
+
+struct class *power_supply_class;
+
+static void power_supply_changed_work(struct work_struct *work)
+{
+ struct power_supply *psy = container_of(work, struct power_supply,
+ changed_work);
+ int i;
+
+ dev_dbg(psy->dev, "%s\n", __FUNCTION__);
+
+ for (i = 0; i < psy->num_supplicants; i++) {
+ struct device *dev;
+
+ down(&power_supply_class->sem);
+ list_for_each_entry(dev, &power_supply_class->devices, node) {
+ struct power_supply *pst = dev_get_drvdata(dev);
+
+ if (!strcmp(psy->supplied_to[i], pst->name)) {
+ if (pst->external_power_changed)
+ pst->external_power_changed(pst);
+ }
+ }
+ up(&power_supply_class->sem);
+ }
+
+ power_supply_update_leds(psy);
+
+ kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
+
+ return;
+}
+
+void power_supply_changed(struct power_supply *psy)
+{
+ dev_dbg(psy->dev, "%s\n", __FUNCTION__);
+
+ schedule_work(&psy->changed_work);
+
+ return;
+}
+
+int power_supply_am_i_supplied(struct power_supply *psy)
+{
+ union power_supply_propval ret = {0,};
+ struct device *dev;
+
+ down(&power_supply_class->sem);
+ list_for_each_entry(dev, &power_supply_class->devices, node) {
+ struct power_supply *epsy = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < epsy->num_supplicants; i++) {
+ if (!strcmp(epsy->supplied_to[i], psy->name)) {
+ if (epsy->get_property(epsy,
+ POWER_SUPPLY_PROP_ONLINE, &ret))
+ continue;
+ if (ret.intval)
+ goto out;
+ }
+ }
+ }
+out:
+ up(&power_supply_class->sem);
+
+ dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
+
+ return ret.intval;
+}
+
+int power_supply_register(struct device *parent, struct power_supply *psy)
+{
+ int rc = 0;
+
+ psy->dev = device_create(power_supply_class, parent, 0,
+ "%s", psy->name);
+ if (IS_ERR(psy->dev)) {
+ rc = PTR_ERR(psy->dev);
+ goto dev_create_failed;
+ }
+
+ dev_set_drvdata(psy->dev, psy);
+
+ INIT_WORK(&psy->changed_work, power_supply_changed_work);
+
+ rc = power_supply_create_attrs(psy);
+ if (rc)
+ goto create_attrs_failed;
+
+ rc = power_supply_create_triggers(psy);
+ if (rc)
+ goto create_triggers_failed;
+
+ power_supply_changed(psy);
+
+ goto success;
+
+create_triggers_failed:
+ power_supply_remove_attrs(psy);
+create_attrs_failed:
+ device_unregister(psy->dev);
+dev_create_failed:
+success:
+ return rc;
+}
+
+void power_supply_unregister(struct power_supply *psy)
+{
+ flush_scheduled_work();
+ power_supply_remove_triggers(psy);
+ power_supply_remove_attrs(psy);
+ device_unregister(psy->dev);
+ return;
+}
+
+static int __init power_supply_class_init(void)
+{
+ power_supply_class = class_create(THIS_MODULE, "power_supply");
+
+ if (IS_ERR(power_supply_class))
+ return PTR_ERR(power_supply_class);
+
+ power_supply_class->dev_uevent = power_supply_uevent;
+
+ return 0;
+}
+
+static void __exit power_supply_class_exit(void)
+{
+ class_destroy(power_supply_class);
+ return;
+}
+
+EXPORT_SYMBOL_GPL(power_supply_changed);
+EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
+EXPORT_SYMBOL_GPL(power_supply_register);
+EXPORT_SYMBOL_GPL(power_supply_unregister);
+
+/* exported for the APM Power driver, APM emulation */
+EXPORT_SYMBOL_GPL(power_supply_class);
+
+subsys_initcall(power_supply_class_init);
+module_exit(power_supply_class_exit);
+
+MODULE_DESCRIPTION("Universal power supply monitor class");
+MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
+ "Szabolcs Gyurko, "
+ "Anton Vorontsov <cbou@mail.ru>");
+MODULE_LICENSE("GPL");