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Date: Sat, 25 Jun 2022 11:42:57 +0800
From: Chunfeng Yun <chunfeng.yun@...iatek.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Felipe Balbi <balbi@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Pavel Hofman <pavel.hofman@...tera.com>,
"Julian Scheel" <julian@...st.de>, xin lin <xin.lin@...iatek.com>,
Yunhao Tian <t123yh.xyz@...il.com>,
Ruslan Bilovol <ruslan.bilovol@...il.com>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
Eddie Hung <eddie.hung@...iatek.com>
Subject: Re: [PATCH] usb: gadget: f_uac1: add IAD descriptor
On Fri, 2022-06-24 at 13:39 +0200, Greg Kroah-Hartman wrote:
> On Wed, Jun 22, 2022 at 04:57:57PM +0800, Chunfeng Yun wrote:
> > From: xin lin <xin.lin@...iatek.com>
> >
> > Win10 can not enumerate composite device of UVC+UAC1+ADB without
> > IAD descriptor
> > in uac1.0, so add it.
>
> I do not know what this means at all, sorry. Can you please provide
> a
> better changelog text that describes what all of this is in more
> detail?
Ok, will add it in next version
>
>
>
> >
> > Signed-off-by: xin lin <xin.lin@...iatek.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> > drivers/usb/gadget/function/f_uac1.c | 21 +++++++++++++++++++++
> > 1 file changed, 21 insertions(+)
> >
> > diff --git a/drivers/usb/gadget/function/f_uac1.c
> > b/drivers/usb/gadget/function/f_uac1.c
> > index 6f0e1d803dc2..8390207bc513 100644
> > --- a/drivers/usb/gadget/function/f_uac1.c
> > +++ b/drivers/usb/gadget/function/f_uac1.c
> > @@ -71,6 +71,17 @@ static inline struct f_uac1_opts
> > *g_audio_to_uac1_opts(struct g_audio *audio)
> > * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
> > */
> >
> > +static struct usb_interface_assoc_descriptor iad_desc = {
> > + .bLength = sizeof(iad_desc),
> > + .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
> > +
> > + .bFirstInterface = 0,
> > + .bInterfaceCount = 3,
> > + .bFunctionClass = USB_CLASS_AUDIO,
> > + .bFunctionSubClass = 0,
> > + .bFunctionProtocol = UAC_VERSION_1,
> > +};
> > +
> > /* B.3.1 Standard AC Interface Descriptor */
> > static struct usb_interface_descriptor ac_interface_desc = {
> > .bLength = USB_DT_INTERFACE_SIZE,
> > @@ -259,6 +270,7 @@ static struct uac_iso_endpoint_descriptor
> > as_iso_in_desc = {
> > };
> >
> > static struct usb_descriptor_header *f_audio_desc[] = {
> > + (struct usb_descriptor_header *)&iad_desc,
>
> Why put this first? Is that a requirement?
Yes, it's a requirement,
Interface Association Descriptor ECN:
"An interface association descriptor must be located before the set of
interface descriptors (including all alternate settings) for the
interfaces it associates."
>
> > (struct usb_descriptor_header *)&ac_interface_desc,
> > (struct usb_descriptor_header *)&ac_header_desc,
> >
> > @@ -293,6 +305,7 @@ static struct usb_descriptor_header
> > *f_audio_desc[] = {
> > };
> >
> > enum {
> > + STR_ASSOC,
>
> Again, why first?
follow uac2 driver
>
> > STR_AC_IF,
> > STR_USB_OUT_IT,
> > STR_USB_OUT_IT_CH_NAMES,
> > @@ -310,6 +323,7 @@ enum {
> >
> > static struct usb_string strings_uac1[] = {
> > /* [STR_AC_IF].s = DYNAMIC, */
> > + [STR_ASSOC].s = "Source/Sink",
> > [STR_USB_OUT_IT].s = "Playback Input terminal",
> > [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
> > [STR_IO_OUT_OT].s = "Playback Output terminal",
> > @@ -1058,6 +1072,7 @@ static void setup_descriptor(struct
> > f_uac1_opts *opts)
> > as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
> > as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
> >
> > + iad_desc.bInterfaceCount = 1;
>
> Why this change?
FS, HS may be different, count up them again.
>
>
> > ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc-
> > >bLength);
> >
> > if (EPIN_EN(opts)) {
> > @@ -1068,6 +1083,7 @@ static void setup_descriptor(struct
> > f_uac1_opts *opts)
> > if (FUIN_EN(opts))
> > len += in_feature_unit_desc->bLength;
> > ac_header_desc->wTotalLength = cpu_to_le16(len);
> > + iad_desc.bInterfaceCount++;
> > }
> > if (EPOUT_EN(opts)) {
> > u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
> > @@ -1077,9 +1093,11 @@ static void setup_descriptor(struct
> > f_uac1_opts *opts)
> > if (FUOUT_EN(opts))
> > len += out_feature_unit_desc->bLength;
> > ac_header_desc->wTotalLength = cpu_to_le16(len);
> > + iad_desc.bInterfaceCount++;
> > }
> >
> > i = 0;
> > + f_audio_desc[i++] = USBDHDR(&iad_desc);
>
> Again, why first?
It is a requirement as ECN says.
>
> > f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
> > f_audio_desc[i++] = USBDHDR(ac_header_desc);
> >
> > @@ -1217,6 +1235,7 @@ static int f_audio_bind(struct
> > usb_configuration *c, struct usb_function *f)
> > }
> > }
> >
> > + iad_desc.iFunction = us[STR_ASSOC].id;
> > ac_interface_desc.iInterface = us[STR_AC_IF].id;
> > usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
> > usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
> > @@ -1302,6 +1321,8 @@ static int f_audio_bind(struct
> > usb_configuration *c, struct usb_function *f)
> > status = usb_interface_id(c, f);
> > if (status < 0)
> > goto err_free_fu;
> > +
> > + iad_desc.bFirstInterface = status;
>
> Shouldn't this be needed without your change?
Need update, it's not always 0.
Thanks a lot
>
> thanks,
>
> greg k-h
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