Re: Handling custom device control requests in userspace

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On 06.04.2018 14:35, Felipe Balbi wrote:

Hi,

Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx> writes:
On 06.04.2018 12:18, Felipe Balbi wrote:

Hi,

Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx> writes:

<snip>

A few advantages over a couple options I've considered are that this mostly
reuses existing functionalities and won't affect users that haven't enabled
it. Please let me know of any feedback on the design or any possible
implementation issues.

IMHO, considering the amount of Android users, we can merge this into
composite.c itself. Just make the code depend on CONFIG_ANDROID. Or
something along the lines of

if (IS_ENABLED(CONFIG_ANDROID))
	android_audio_accessory_init();

should get the job done.

Huh and what with people that are not android but need to support
Android accessory in their products?

Do those really exist?

Well, if they _really_ exist, we can add a "Enable Support for Android
Audio Accessory" specific to the gadget framework. Then test for:

if (IS_ENABLED(CONFIG_USB_GADGET_ANDROID_AUDIO_ACCESSORY))

or whatever. I'm not certain such devices exist though, need
confirmation.


Yes, they exist. Most of Tizen phones support android accessory.

Fair enough. A specific Kconfig for that is okay.


Let me just mention that if we had a generic interface we could cover not only android requirements but also do a great job for people who are fuzzing USB hosts. Such an interface would allow to easily craft some random requests without all this noise related to using GadgetFS...

Best regards,
--
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics
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