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usb: gadget: f_uac2: Add suspend callback

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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 <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-10-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Hofman 2022-01-21 16:53:07 +01:00 committed by Greg Kroah-Hartman
parent 62385cf158
commit 7ff4a3b548
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/gadget/function/f_uac2.c
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@ -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;