usb: gadget: multi: convert to new interface of f_rndis

Convert the legacy multi gadget to the new interface of f_rndis,
so that later the compatibility layer in f_rndis can be removed.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/Kconfig

@@ -1036,7 +1036,6 @@ config USB_G_MULTI
 	select USB_LIBCOMPOSITE
 	select USB_U_SERIAL
 	select USB_U_ETHER
-	select USB_U_RNDIS
 	select USB_F_ACM
 	select USB_U_MS
 	help
@@ -1057,6 +1056,8 @@ config USB_G_MULTI
 config USB_G_MULTI_RNDIS
 	bool "RNDIS + CDC Serial + Storage configuration"
 	depends on USB_G_MULTI
+	select USB_U_RNDIS
+	select USB_F_RNDIS
 	default y
 	help
 	  This option enables a configuration with RNDIS, CDC Serial and

drivers/usb/gadget/multi.c

@@ -47,8 +47,7 @@ MODULE_LICENSE("GPL");
 
 #include "u_ecm.h"
 #ifdef USB_ETH_RNDIS
-#  define USB_FRNDIS_INCLUDED
-#  include "f_rndis.c"
+#  include "u_rndis.h"
 #  include "rndis.h"
 #endif
 #include "u_ether.h"
@@ -152,14 +151,13 @@ FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
 static struct fsg_common fsg_common;
 
 static struct usb_function_instance *fi_acm;
-static struct eth_dev *the_dev;
 
 /********** RNDIS **********/
 
 #ifdef USB_ETH_RNDIS
-static u8 host_mac[ETH_ALEN];
-
+static struct usb_function_instance *fi_rndis;
 static struct usb_function *f_acm_rndis;
+static struct usb_function *f_rndis;
 
 static __init int rndis_do_config(struct usb_configuration *c)
 {
@@ -170,13 +168,19 @@ static __init int rndis_do_config(struct usb_configuration *c)
 		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 	}
 
-	ret = rndis_bind_config(c, host_mac, the_dev);
+	f_rndis = usb_get_function(fi_rndis);
+	if (IS_ERR(f_rndis))
+		return PTR_ERR(f_rndis);
+
+	ret = usb_add_function(c, f_rndis);
 	if (ret < 0)
-		return ret;
+		goto err_func_rndis;
 
 	f_acm_rndis = usb_get_function(fi_acm);
-	if (IS_ERR(f_acm_rndis))
-		return PTR_ERR(f_acm_rndis);
+	if (IS_ERR(f_acm_rndis)) {
+		ret = PTR_ERR(f_acm_rndis);
+		goto err_func_acm;
+	}
 
 	ret = usb_add_function(c, f_acm_rndis);
 	if (ret)
@@ -191,6 +195,10 @@ err_fsg:
 	usb_remove_function(c, f_acm_rndis);
 err_conf:
 	usb_put_function(f_acm_rndis);
+err_func_acm:
+	usb_remove_function(c, f_rndis);
+err_func_rndis:
+	usb_put_function(f_rndis);
 	return ret;
 }
 
@@ -299,12 +307,15 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
 	struct usb_gadget *gadget = cdev->gadget;
 #ifdef CONFIG_USB_G_MULTI_CDC
 	struct f_ecm_opts *ecm_opts;
+#endif
+#ifdef USB_ETH_RNDIS
+	struct f_rndis_opts *rndis_opts;
 #endif
 	int status;
 
 	if (!can_support_ecm(cdev->gadget)) {
 		dev_err(&gadget->dev, "controller '%s' not usable\n",
-		        gadget->name);
+			gadget->name);
 		return -EINVAL;
 	}
 
@@ -320,26 +331,38 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
 		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);
+#endif
 
-	the_dev = netdev_priv(ecm_opts->net);
+#ifdef USB_ETH_RNDIS
+	fi_rndis = usb_get_function_instance("rndis");
+	if (IS_ERR(fi_rndis)) {
+		status = PTR_ERR(fi_rndis);
+		goto fail;
+	}
 
-#elif defined USB_ETH_RNDIS
+	rndis_opts = container_of(fi_rndis, struct f_rndis_opts, func_inst);
 
-	/* set up network link layer */
-	the_dev = gether_setup(cdev->gadget, dev_addr, host_addr, host_mac,
-			       qmult);
-	if (IS_ERR(the_dev))
-		return PTR_ERR(the_dev);
+	gether_set_qmult(rndis_opts->net, qmult);
+	if (!gether_set_host_addr(rndis_opts->net, host_addr))
+		pr_info("using host ethernet address: %s", host_addr);
+	if (!gether_set_dev_addr(rndis_opts->net, dev_addr))
+		pr_info("using self ethernet address: %s", dev_addr);
 #endif
 
 #if (defined CONFIG_USB_G_MULTI_CDC && defined USB_ETH_RNDIS)
+	/*
+	 * If both ecm and rndis are selected then:
+	 *	1) rndis borrows the net interface from ecm
+	 *	2) since the interface is shared it must not be bound
+	 *	twice - in ecm's _and_ rndis' binds, so do it here.
+	 */
 	gether_set_gadget(ecm_opts->net, cdev->gadget);
 	status = gether_register_netdev(ecm_opts->net);
 	if (status)
 		goto fail0;
-	ecm_opts->bound = true;
 
-	gether_get_host_addr_u8(ecm_opts->net, host_mac);
+	rndis_borrow_net(fi_rndis, ecm_opts->net);
+	ecm_opts->bound = true;
 #endif
 
 	/* set up serial link layer */
@@ -388,10 +411,12 @@ fail2:
 fail1:
 	usb_put_function_instance(fi_acm);
 fail0:
+#ifdef USB_ETH_RNDIS
+	usb_put_function_instance(fi_rndis);
+fail:
+#endif
 #ifdef CONFIG_USB_G_MULTI_CDC
 	usb_put_function_instance(fi_ecm);
-#else
-	gether_cleanup(the_dev);
 #endif
 	return status;
 }
@@ -405,11 +430,13 @@ static int __exit multi_unbind(struct usb_composite_dev *cdev)
 	usb_put_function(f_acm_rndis);
 #endif
 	usb_put_function_instance(fi_acm);
+#ifdef USB_ETH_RNDIS
+	usb_put_function(f_rndis);
+	usb_put_function_instance(fi_rndis);
+#endif
 #ifdef CONFIG_USB_G_MULTI_CDC
 	usb_put_function(f_ecm);
 	usb_put_function_instance(fi_ecm);
-#else
-	gether_cleanup(the_dev);
 #endif
 	return 0;
 }