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| author | Pavel Hofman <pavel.hofman@ivitera.com> | 2022-01-21 18:53:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-26 16:06:09 +0300 |
| commit | 7ff4a3b5489959a0256840a361b54d979b822535 (patch) | |
| tree | be6c7a996aca7c4798c7e360403f4e4e1abc144e /drivers/usb/gadget/function | |
| parent | 62385cf158a7e65b5f347590521d02ee75dc8518 (diff) | |
| download | linux-7ff4a3b5489959a0256840a361b54d979b822535.tar.xz | |
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 <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>
Diffstat (limited to 'drivers/usb/gadget/function')
| -rw-r--r-- | drivers/usb/gadget/function/f_uac2.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index 5ee5314780a6..3e6339439b88 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; |