[BATTERY] Universal power supply class (was: battery class)

This class is result of "external power" and "battery" classes merge,
as suggested by David Woodhouse. He also implemented uevent support.

Here how userspace seeing it now:

    	# ls /sys/class/power\ supply/
    	ac  main-battery  usb

    	# cat /sys/class/power\ supply/ac/type
    	AC

    	# cat /sys/class/power\ supply/usb/type
    	USB

    	# cat /sys/class/power\ supply/main-battery/type
    	Battery

    	# cat /sys/class/power\ supply/ac/online
    	1

    	# cat /sys/class/power\ supply/usb/online
    	0

    	# cat /sys/class/power\ supply/main-battery/status
    	Charging

    	# cat /sys/class/leds/h5400\:red-left/trigger
    	none h5400-radio timer hwtimer ac-online usb-online
    	main-battery-charging-or-full [main-battery-charging]
    	main-battery-full

Signed-off-by: Anton Vorontsov <cbou@mail.ru>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/power/power_supply.h b/drivers/power/power_supply.h
new file mode 100644
index 000000000000..a9880d468ee4
--- /dev/null
+++ b/drivers/power/power_supply.h
@@ -0,0 +1,42 @@
+/*
+ *  Functions private to power supply 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
+ */
+
+#ifdef CONFIG_SYSFS
+
+extern int power_supply_create_attrs(struct power_supply *psy);
+extern void power_supply_remove_attrs(struct power_supply *psy);
+extern int power_supply_uevent(struct device *dev, char **envp, int num_envp,
+                               char *buffer, int buffer_size);
+
+#else
+
+static inline int power_supply_create_attrs(struct power_supply *psy)
+{ return 0; }
+static inline void power_supply_remove_attrs(struct power_supply *psy) {}
+#define power_supply_uevent NULL
+
+#endif /* CONFIG_SYSFS */
+
+#ifdef CONFIG_LEDS_TRIGGERS
+
+extern void power_supply_update_leds(struct power_supply *psy);
+extern int power_supply_create_triggers(struct power_supply *psy);
+extern void power_supply_remove_triggers(struct power_supply *psy);
+
+#else
+
+static inline void power_supply_update_leds(struct power_supply *psy) {}
+static inline int power_supply_create_triggers(struct power_supply *psy)
+{ return 0; }
+static inline void power_supply_remove_triggers(struct power_supply *psy) {}
+
+#endif /* CONFIG_LEDS_TRIGGERS */