Hi, "Felix Hädicke" <FelixHaedicke@xxxxxx> writes: >> > Introduces a new FunctionFS descriptor flag named >> > FUNCTIONFS_ALL_CTRL_RECIP. When this flag is enabled, control requests, >> > which are not explicitly directed to an interface or endpoint, can be >> > handled. >> > >> > This allows FunctionFS userspace drivers to process non-standard >> > control requests. >> > >> > Signed-off-by: Felix Hädicke <felixhaedicke@xxxxxx> >> >> can you describe a situation where this is needed? That would be >> valuable for commit log > > I am developing a driver, which I would like to implement using > FunctionFS, for using the Android Open Accessory protocol on > non-Android devices. These accessories send some non-standard control > requests which are described here: > https://source.android.com/devices/accessories/aoa.html oh cool. I was thinking about Android Accessory a couple weeks ago. I'm not sure yet if functionfs is the best way to go here. Maybe we should actually have a proper function (f_android_accessory.c??) so it's easier to handle this. Also, maybe we should add some Android folks to the loop here. Adding android's accessory function author here. Mike, I'm looking at [1]. Do you have any interest in getting that upstream? Also, taking the opportunity to raise another question: I noticed android's MTP is pretty darn slow, I'm assuming the limitation is functionfs itself. Do you wanna see how we can make that faster? cheers [1] https://android.googlesource.com/kernel/common/+/android-4.4/drivers/usb/gadget/function/f_accessory.c -- balbi
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