[PATCH v2 4/9] usb: gadget: uvc: Copy XU descriptors during .bind()

[Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>]

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.

Signed-off-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
---
Changes in v2:

	- none

 drivers/usb/gadget/function/f_uvc.c | 35 +++++++++++++++++++++++++++++
 drivers/usb/gadget/function/uvc.h   |  1 +
 2 files changed, 36 insertions(+)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index eca5f36dfa74..e0a308f1355c 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -464,6 +464,25 @@ 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)
 {
@@ -475,6 +494,7 @@ 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;
@@ -539,6 +559,13 @@ 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;
@@ -565,6 +592,13 @@ 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) {
+		struct uvcg_extension_unit_descriptor *desc = &xu->desc;
+
+		UVC_COPY_XU_DESCRIPTOR(mem, dst, desc);
+	}
+
 	uvc_control_header->wTotalLength = cpu_to_le16(control_size);
 	uvc_control_header->bInCollection = 1;
 	uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
@@ -988,6 +1022,7 @@ static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
 	uvc->desc.fs_streaming = opts->fs_streaming;
 	uvc->desc.hs_streaming = opts->hs_streaming;
 	uvc->desc.ss_streaming = opts->ss_streaming;
+	uvc->desc.extension_units = &opts->extension_units;
 
 	streaming = config_group_find_item(&opts->func_inst.group, "streaming");
 	if (!streaming)
diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
index 40226b1f7e14..f1a016d20bb6 100644
--- a/drivers/usb/gadget/function/uvc.h
+++ b/drivers/usb/gadget/function/uvc.h
@@ -143,6 +143,7 @@ struct uvc_device {
 		const struct uvc_descriptor_header * const *fs_streaming;
 		const struct uvc_descriptor_header * const *hs_streaming;
 		const struct uvc_descriptor_header * const *ss_streaming;
+		struct list_head *extension_units;
 	} desc;
 
 	unsigned int control_intf;
-- 
2.34.1