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USB accessory mode allows users to connect USB host hardware specifically designed for Android-powered devices. The accessories must adhere to the Android accessory protocol outlined in the http://accessories.android.com documentation. This allows Android devices that cannot act as a USB host to still interact with USB hardware. When an Android device is in USB accessory mode, the attached Android USB accessory acts as the host, provides power to the USB bus, and enumerates connected devices. Bug: 63740241 Bug: 120441124 Change-Id: I67964b50d278f3c0471d47efbb7b0973a3502681 [badhri: f_accessory is being migrated to userspace.] Signed-off-by: Mike Lockwood <lockwood@android.com> [AmitP: Folded following android-4.9 commit changes into this patchceb2f0aac6("ANDROID: usb: gadget: accessory: Fix section mismatch") Parts ofe275439310("ANDROID: usb: gadget: Fixes and hacks to make android usb gadget compile on 3.8")1b07ec7515("ANDROID: drivers: usb: gadget: 64-bit related type fixes")] Signed-off-by: Amit Pundir <amit.pundir@linaro.org> [astrachan: Folded the following changes into this patch: 9d5891d516e2 ("ANDROID: usb: gadget: f_accessory: Add ACCESSORY_SET_AUDIO_MODE control request and ioctl") dc66cfce9622 ("ANDROID: usb: gadget: f_accessory: Add support for HID input devices") 5f1ac9c2871b ("ANDROID: usb: gadget: f_accessory: move userspace interface to uapi") 9a6241722cd8 ("ANDROID: usb: gadget: f_accessory: Enabled Zero Length Packet (ZLP) for acc_write") 31a0ecd5a825 ("ANDROID: usb: gadget: f_accessory: check for accessory device before disconnecting HIDs") 580721fa6cbc ("ANDROID: usb: gadget: f_accessory: Migrate to USB_FUNCTION API") 7f407172fb28 ("ANDROID: usb: gadget: f_accessory: Fix for UsbAccessory clean unbind.") ebc98ac5a22f ("ANDROID: usb: gadget: f_accessory: fix false disconnect due to a signal sent to the reading process") 71c6dc5ffdab ("ANDROID: usb: gadget: f_accessory: assign no-op request complete callbacks") 675047ee68e9 ("ANDROID: usb: gadget: f_accessory: Move gadget functions code") b2bedaa5c7df ("CHROMIUM: usb: gadget: f_accessory: add .raw_request callback")] Signed-off-by: Alistair Strachan <astrachan@google.com>