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Nexus 7 Android tablet can be turned off using a special bootloader command which is conveyed to bootloader by putting magic value into the special scratch register and then rebooting normally. This power-off method should be invoked if USB cable is connected. Bootloader then will display battery status and power off the device. This behaviour is borrowed from downstream kernel and matches user expectations, otherwise it looks like device got hung during power-off and it may wake up on USB disconnect. Switch PMC driver to sys-off handler API, which provides drivers with chained power-off callbacks functionality that is required for powering-off devices properly. It also brings resource-managed API for the restart handler registration that makes PMC driver code cleaner. Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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