Commit 7ff4a3b5 authored by Pavel Hofman's avatar Pavel Hofman Committed by Greg Kroah-Hartman
Browse files

usb: gadget: f_uac2: Add suspend callback 



When USB cable gets disconnected, the undergoing playback/capture
stalls, without any notification to u_audio about the change.
Experiments with a dwc2 gadget revealed that Suspend interrupt is
thrown at cable disconnection, which the gadget framework translates to
calling suspend callback of a function, if it is defined.

Add the suspend callback to f_uac2 function, calling
corresponding method of u_audio in order to stop the respective PCM
streams and to notify subscribed clients at cable disconnection.

Signed-off-by: default avatarPavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-10-pavel.hofman@ivitera.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 62385cf1

drivers/usb/gadget/function/f_uac2.c

+9 −0
Original line number Diff line number Diff line
@@ -1433,6 +1433,14 @@ afunc_disable(struct usb_function *fn) 
		usb_ep_disable(uac2->int_ep);

}



static void

afunc_suspend(struct usb_function *fn)

{

	struct f_uac2 *uac2 = func_to_uac2(fn);



	u_audio_suspend(&uac2->g_audio);

}



static int

in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)

{
@@ -2104,6 +2112,7 @@ static struct usb_function *afunc_alloc(struct usb_function_instance *fi) 
	uac2->g_audio.func.set_alt = afunc_set_alt;

	uac2->g_audio.func.get_alt = afunc_get_alt;

	uac2->g_audio.func.disable = afunc_disable;

	uac2->g_audio.func.suspend = afunc_suspend;

	uac2->g_audio.func.setup = afunc_setup;

	uac2->g_audio.func.free_func = afunc_free;