>From bf48dcd9cb254576cfea373c9a5d2ab996408895 Mon Sep 17 00:00:00 2001 From: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> Date: Tue, 13 Mar 2018 11:47:38 +0800 Subject: [PATCH] Add Apple Carplay driver Some Apple devices which support Carplay can enter USB Host Mode from USB Device Mode after receiving a specific USB Vendor Request. There is a requirement apply to accesssories that support the USB dual role switch feature, and must have a USB-A receptacle that is capable of functioning in both USB Host and USB Device roles. It means that the driver should supports manual Dual-Role switch, due to no IDDIG pin is avaliable. There is no suitable place to add this spicific USB Vendor Request, so here I extract a single driver which allow user force to send it by a debug interface when need it, and keep it independent on USB Dual-Role Controller Drivers. But to implement carplay feature, there are some requirments for USB Dual-Role Driver: 1. supports manual dual-role switch, such as, by a debug interface; 2. keep vbus alive even when switch host into device mode; More information please refer to "Chapter 46. USB Role Switch" in MFI Accessroy Interface Specification.pdf Chunfeng Yun (1): usb: misc: supports Apple Carplay driver drivers/usb/misc/Kconfig | 9 +++ drivers/usb/misc/Makefile | 1 + drivers/usb/misc/carplay.c | 193 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 203 insertions(+) create mode 100644 drivers/usb/misc/carplay.c -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
