[PATCH] usb: gadget: function: f_uac1 add interface assoc desc

[liangshengjun]

Add f_uac1 interface association descriptor, make f_uac1 link other function(like f_uvc) is possible.

Signed-off-by: Liang Shengjun <liangshengjun@xxxxxxxxxxxxx>
---
 drivers/usb/gadget/function/f_uac1.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index 2746a92..28c1a78 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -48,6 +48,16 @@ static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
 /* Number of streaming interfaces */
 #define F_AUDIO_NUM_INTERFACES		2
 
+static struct usb_interface_assoc_descriptor uac_iad = {
+	.bLength = sizeof(uac_iad),
+	.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,
@@ -247,6 +257,7 @@ static struct uac_iso_endpoint_descriptor as_iso_in_desc = {  };
 
 static struct usb_descriptor_header *f_audio_desc[] = {
+	(struct usb_descriptor_header *)&uac_iad,
 	(struct usb_descriptor_header *)&ac_interface_desc,
 	(struct usb_descriptor_header *)&ac_header_desc,
 
@@ -523,6 +534,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
 	if (IS_ERR(us))
 		return PTR_ERR(us);
+	uac_iad.iFunction = us[STR_AC_IF].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; @@ -559,6 +571,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	status = usb_interface_id(c, f);
 	if (status < 0)
 		goto fail;
+	uac_iad.bFirstInterface = status;
 	ac_interface_desc.bInterfaceNumber = status;
 	uac1->ac_intf = status;
 	uac1->ac_alt = 0;
--
2.7.4