usb: gadget: webcam: convert webcam to new interface of f_uvc

Use the new function interface of f_uvc.

Signed-off-by: Andrzej Pietrasiewicz <[e-mail]>
Tested-by: Michael Grzeschik <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/gadget/legacy/Kconfig

···
 	depends on VIDEO_DEV
 	select USB_LIBCOMPOSITE
 	select VIDEOBUF2_VMALLOC
+	select USB_F_UVC
 	help
 	  The Webcam Gadget acts as a composite USB Audio and Video Class
 	  device. It provides a userspace API to process UVC control requests

drivers/usb/gadget/legacy/Makefile

···
 g_hid-y				:= hid.o
 g_dbgp-y			:= dbgp.o
 g_nokia-y			:= nokia.o
-g_webcam-y			:= webcam.o ../function/uvc_queue.o ../function/uvc_v4l2.o ../function/uvc_video.o
+g_webcam-y			:= webcam.o
 g_ncm-y				:= ncm.o
 g_acm_ms-y			:= acm_ms.o
 g_tcm_usb_gadget-y		:= tcm_usb_gadget.o

drivers/usb/gadget/legacy/webcam.c

···
 #include <linux/module.h>
 #include <linux/usb/video.h>
 
-/*
- * Kbuild is not very cooperative with respect to linking separately
- * compiled library objects into one module.  So for now we won't use
- * separate compilation ... ensuring init/exit sections work to shrink
- * the runtime footprint, and giving us at least some parts of what
- * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
- */
-#define USBF_UVC_INCLUDED
-#include "f_uvc.c"
+#include "u_uvc.h"
 
 USB_GADGET_COMPOSITE_OPTIONS();
 
···
 	&webcam_stringtab,
 	NULL,
 };
+
+static struct usb_function_instance *fi_uvc;
+static struct usb_function *f_uvc;
 
 static struct usb_device_descriptor webcam_device_descriptor = {
 	.bLength		= USB_DT_DEVICE_SIZE,
···
 static int __init
 webcam_config_bind(struct usb_configuration *c)
 {
-	return uvc_bind_config(c, uvc_fs_control_cls,
-		uvc_ss_control_cls, uvc_fs_streaming_cls,
-		uvc_hs_streaming_cls, uvc_ss_streaming_cls,
-		streaming_interval, streaming_maxpacket,
-		streaming_maxburst, trace);
+	int status = 0;
+
+	f_uvc = usb_get_function(fi_uvc);
+	if (IS_ERR(f_uvc))
+		return PTR_ERR(f_uvc);
+
+	status = usb_add_function(c, f_uvc);
+	if (status < 0)
+		usb_put_function(f_uvc);
+
+	return status;
 }
 
 static struct usb_configuration webcam_config_driver = {
···
 static int /* __init_or_exit */
 webcam_unbind(struct usb_composite_dev *cdev)
 {
+	if (!IS_ERR_OR_NULL(f_uvc))
+		usb_put_function(f_uvc);
+	if (!IS_ERR_OR_NULL(fi_uvc))
+		usb_put_function_instance(fi_uvc);
 	return 0;
 }
 
 static int __init
 webcam_bind(struct usb_composite_dev *cdev)
 {
+	struct f_uvc_opts *uvc_opts;
 	int ret;
+
+	fi_uvc = usb_get_function_instance("uvc");
+	if (IS_ERR(fi_uvc))
+		return PTR_ERR(fi_uvc);
+
+	uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);
+
+	uvc_opts->streaming_interval = streaming_interval;
+	uvc_opts->streaming_maxpacket = streaming_maxpacket;
+	uvc_opts->streaming_maxburst = streaming_maxburst;
+	uvc_set_trace_param(trace);
+
+	uvc_opts->fs_control = uvc_fs_control_cls;
+	uvc_opts->ss_control = uvc_ss_control_cls;
+	uvc_opts->fs_streaming = uvc_fs_streaming_cls;
+	uvc_opts->hs_streaming = uvc_hs_streaming_cls;
+	uvc_opts->ss_streaming = uvc_ss_streaming_cls;
 
 	/* Allocate string descriptor numbers ... note that string contents
 	 * can be overridden by the composite_dev glue.
···
 	return 0;
 
 error:
-	webcam_unbind(cdev);
+	usb_put_function_instance(fi_uvc);
 	return ret;
 }