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FunctionFS: initial implementation
This is the second version of a patch which demonstrates the possibility of using adbd (Android Debug Bridge daemon) with a generic FunctionFS gadget instead of a custom adb usb gadget in the Linux kernel. It contains changes introduced after Benoit's review - thank you Benoit. The patch adds a new usb access layer to adbd using FunctionFS. The former usb access method is still available. The method is chosen at runtime depending if /dev/usb-ffs/adb/ep0 or /dev/android_adb is accessible. How to use on the target device: $ insmod g_ffs.ko idVendor=<vendor ID> iSerialNumber=<some string> $ mount -t functionfs adb /dev/usb-ffs/adb -o uid=2000,gid=2000 $ ./adbd This patch requires a patch to bionic which adds <linux/usb_functionfs.h> which is an exact copy of the relevant file in the linux kernel. Change-Id: I4b42eb267ffa50fca7a5fba46f388a2f083e8b2d Signed-off-by: Andrzej Pietrasiewicz <firstname.lastname@example.org> Signed-off-by: Kyungmin Park <email@example.com> [firstname.lastname@example.org: detect at runtime if functionfs is mounted or fallback using f_adb] Signed-off-by: Benoit Goby <email@example.com>
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