usb: gadget: uvc: Copy XU descriptors during .bind()

Now that extension unit support is available through configfs we need
to copy the descriptors for the XUs during uvc_function_bind() so that
they're exposed to the usb subsystem.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20230206161802.892954-5-dan.scally@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 443333471b4d..f6fd5decdcb7 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -478,6 +478,25 @@ uvc_register_video(struct uvc_device *uvc)
 		} \
 	} while (0)
 
+#define UVC_COPY_XU_DESCRIPTOR(mem, dst, desc)					\
+	do {									\
+		*(dst)++ = mem;							\
+		memcpy(mem, desc, 22); /* bLength to bNrInPins */		\
+		mem += 22;							\
+										\
+		memcpy(mem, (desc)->baSourceID, (desc)->bNrInPins);		\
+		mem += (desc)->bNrInPins;					\
+										\
+		memcpy(mem, &(desc)->bControlSize, 1);				\
+		mem++;								\
+										\
+		memcpy(mem, (desc)->bmControls, (desc)->bControlSize);		\
+		mem += (desc)->bControlSize;					\
+										\
+		memcpy(mem, &(desc)->iExtension, 1);				\
+		mem++;								\
+	} while (0)
+
 static struct usb_descriptor_header **
 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 {
@@ -489,6 +508,7 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 	const struct usb_descriptor_header * const *src;
 	struct usb_descriptor_header **dst;
 	struct usb_descriptor_header **hdr;
+	struct uvcg_extension *xu;
 	unsigned int control_size;
 	unsigned int streaming_size;
 	unsigned int n_desc;
@@ -556,6 +576,13 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 		bytes += (*src)->bLength;
 		n_desc++;
 	}
+
+	list_for_each_entry(xu, uvc->desc.extension_units, list) {
+		control_size += xu->desc.bLength;
+		bytes += xu->desc.bLength;
+		n_desc++;
+	}
+
 	for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
 	     *src; ++src) {
 		streaming_size += (*src)->bLength;
@@ -582,6 +609,10 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 	uvc_control_header = mem;
 	UVC_COPY_DESCRIPTORS(mem, dst,
 		(const struct usb_descriptor_header **)uvc_control_desc);
+
+	list_for_each_entry(xu, uvc->desc.extension_units, list)
+		UVC_COPY_XU_DESCRIPTOR(mem, dst, &xu->desc);
+
 	uvc_control_header->wTotalLength = cpu_to_le16(control_size);
 	uvc_control_header->bInCollection = 1;
 	uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
@@ -1025,6 +1056,8 @@ static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
 		return ERR_PTR(-EBUSY);
 	}
 
+	uvc->desc.extension_units = &opts->extension_units;
+
 	++opts->refcnt;
 	mutex_unlock(&opts->lock);