usb: gadget: g_ffs: convert to new interface of f_ecm

There is a new funtion interface and g_ffs is the last gadget to use the old.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/Kconfig

@@ -895,6 +895,7 @@ config USB_FUNCTIONFS_ETH
 	bool "Include configuration with CDC ECM (Ethernet)"
 	depends on USB_FUNCTIONFS && NET
 	select USB_U_ETHER
+	select USB_F_ECM
 	help
 	  Include a configuration with CDC ECM function (Ethernet) and the
 	  Function Filesystem.

drivers/usb/gadget/g_ffs.c

@@ -28,8 +28,7 @@
 #    define USB_ETH_RNDIS y
 #  endif
 
-#define USBF_ECM_INCLUDED
-#  include "f_ecm.c"
+#  include "u_ecm.h"
 #define USB_FSUBSET_INCLUDED
 #  include "f_subset.c"
 #  ifdef USB_ETH_RNDIS
@@ -39,11 +38,15 @@
 #  endif
 #  include "u_ether.h"
 
+USB_ETHERNET_MODULE_PARAMETERS();
+
 static u8 gfs_host_mac[ETH_ALEN];
 static struct eth_dev *the_dev;
 #  ifdef CONFIG_USB_FUNCTIONFS_ETH
 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN],
 		struct eth_dev *dev);
+static struct usb_function_instance *fi_ecm;
+static struct usb_function *f_ecm;
 #  endif
 #else
 #  define the_dev	NULL
@@ -76,10 +79,6 @@ struct gfs_ffs_obj {
 
 USB_GADGET_COMPOSITE_OPTIONS();
 
-#if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS
-USB_ETHERNET_MODULE_PARAMETERS();
-#endif
-
 static struct usb_device_descriptor gfs_dev_desc = {
 	.bLength		= sizeof gfs_dev_desc,
 	.bDescriptorType	= USB_DT_DEVICE,
@@ -355,14 +354,50 @@ static int gfs_bind(struct usb_composite_dev *cdev)
 
 	if (missing_funcs)
 		return -ENODEV;
-#if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS
+#if defined CONFIG_USB_FUNCTIONFS_ETH
+	if (can_support_ecm(cdev->gadget)) {
+		struct f_ecm_opts *ecm_opts;
+
+		fi_ecm = usb_get_function_instance("ecm");
+		if (IS_ERR(fi_ecm))
+			return PTR_ERR(fi_ecm);
+		ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
+
+		gether_set_qmult(ecm_opts->net, qmult);
+
+		if (!gether_set_host_addr(ecm_opts->net, host_addr))
+			pr_info("using host ethernet address: %s", host_addr);
+		if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
+			pr_info("using self ethernet address: %s", dev_addr);
+
+		the_dev = netdev_priv(ecm_opts->net);
+	} else {
+		the_dev = gether_setup(cdev->gadget, dev_addr, host_addr,
+				       gfs_host_mac, qmult);
+	}
+
+#elif defined CONFIG_USB_FUNCTIONFS_RNDIS
+
 	the_dev = gether_setup(cdev->gadget, dev_addr, host_addr, gfs_host_mac,
 			       qmult);
 #endif
-	if (IS_ERR(the_dev)) {
-		ret = PTR_ERR(the_dev);
-		goto error_quick;
+	if (IS_ERR(the_dev))
+		return PTR_ERR(the_dev);
+
+#if defined CONFIG_USB_FUNCTIONFS_RNDIS && defined CONFIG_USB_FUNCTIONFS_ETH
+	if (can_support_ecm(cdev->gadget)) {
+		struct f_ecm_opts *ecm_opts;
+
+		ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
+
+		gether_set_gadget(ecm_opts->net, cdev->gadget);
+		ret = gether_register_netdev(ecm_opts->net);
+		if (ret)
+			goto error;
+		ecm_opts->bound = true;
+		gether_get_host_addr_u8(ecm_opts->net, gfs_host_mac);
 	}
+#endif
 
 	ret = usb_string_ids_tab(cdev, gfs_strings);
 	if (unlikely(ret < 0))
@@ -398,9 +433,16 @@ static int gfs_bind(struct usb_composite_dev *cdev)
 	for (i = 0; i < func_num; i++)
 		functionfs_unbind(ffs_tab[i].ffs_data);
 error:
+#if defined CONFIG_USB_FUNCTIONFS_ETH
+	if (can_support_ecm(cdev->gadget))
+		usb_put_function_instance(fi_ecm);
+	else
+		gether_cleanup(the_dev);
+	the_dev = NULL;
+#elif defined CONFIG_USB_FUNCTIONFS_RNDIS
 	gether_cleanup(the_dev);
 	the_dev = NULL;
-error_quick:
+#endif
 	return ret;
 }
 
@@ -413,8 +455,19 @@ static int gfs_unbind(struct usb_composite_dev *cdev)
 
 	ENTER();
 
+
+#if defined CONFIG_USB_FUNCTIONFS_ETH
+	if (can_support_ecm(cdev->gadget)) {
+		usb_put_function(f_ecm);
+		usb_put_function_instance(fi_ecm);
+	} else {
 		gether_cleanup(the_dev);
+	}
 	the_dev = NULL;
+#elif defined CONFIG_USB_FUNCTIONFS_RNDIS
+	gether_cleanup(the_dev);
+	the_dev = NULL;
+#endif
 
 	/*
 	 * We may have been called in an error recovery from
@@ -483,9 +536,21 @@ static int gfs_do_config(struct usb_configuration *c)
 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN],
 		struct eth_dev *dev)
 {
-	return can_support_ecm(c->cdev->gadget)
-		? ecm_bind_config(c, ethaddr, dev)
-		: geth_bind_config(c, ethaddr, dev);
+	int status = 0;
+
+	if (can_support_ecm(c->cdev->gadget)) {
+		f_ecm = usb_get_function(fi_ecm);
+		if (IS_ERR(f_ecm))
+			return PTR_ERR(f_ecm);
+
+		status = usb_add_function(c, f_ecm);
+		if (status < 0)
+			usb_put_function(f_ecm);
+
+	} else {
+		status = geth_bind_config(c, ethaddr, dev);
+	}
+	return status;
 }
 
 #endif