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Subject[PATCH] usb: gadget: f_uac1: add IAD descriptor
Date
From: xin lin <xin.lin@mediatek.com>

Win10 can not enumerate composite device of UVC+UAC1+ADB without IAD descriptor
in uac1.0, so add it.

Signed-off-by: xin lin <xin.lin@mediatek.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.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,
(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,
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;
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);
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;
ac_interface_desc.bInterfaceNumber = status;
uac1->ac_intf = status;
uac1->ac_alt = 0;
--
2.18.0
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