From: Pavel Hofman Date: Fri, 21 Jan 2022 15:53:07 +0000 (+0100) Subject: usb: gadget: f_uac2: Add suspend callback X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7ff4a3b5489959a0256840a361b54d979b822535;p=linux.git 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: Pavel Hofman Link: https://lore.kernel.org/r/20220121155308.48794-10-pavel.hofman@ivitera.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index 5ee5314780a61..3e6339439b887 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -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;