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Commit b3df2faa authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
Browse files

usb: gadget: f_rndis: add configfs support 



f_rndis learns about configfs so we can, eventually,
remove in-kernel gadget drivers.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 4e75e727

Documentation/ABI/testing/configfs-usb-gadget-rndis

0 → 100644
+14 −0
Original line number Diff line number Diff line 
What:		/config/usb-gadget/gadget/functions/rndis.name

Date:		May 2013

KenelVersion:	3.11

Description:

		The attributes:



		ifname		- network device interface name associated with

				this function instance

		qmult		- queue length multiplier for high and

				super speed

		host_addr	- MAC address of host's end of this

				Ethernet over USB link

		dev_addr	- MAC address of device's end of this

				Ethernet over USB link

drivers/usb/gadget/Kconfig

+16 −0
Original line number Diff line number Diff line
@@ -560,6 +560,22 @@ config USB_CONFIGFS_ECM_SUBSET 
	  On hardware that can't implement the full protocol,

	  a simple CDC subset is used, placing fewer demands on USB.



config USB_CONFIGFS_RNDIS

	bool "RNDIS"

	depends on USB_CONFIGFS

	depends on NET

	select USB_U_ETHER

	select USB_F_RNDIS

	help

	   Microsoft Windows XP bundles the "Remote NDIS" (RNDIS) protocol,

	   and Microsoft provides redistributable binary RNDIS drivers for

	   older versions of Windows.



	   To make MS-Windows work with this, use Documentation/usb/linux.inf

	   as the "driver info file".  For versions of MS-Windows older than

	   XP, you'll need to download drivers from Microsoft's website; a URL

	   is given in comments found in that info file.



config USB_CONFIGFS_EEM

	bool "Ethernet Emulation Model (EEM)"

	depends on USB_CONFIGFS

drivers/usb/gadget/f_rndis.c

+48 −1
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/atomic.h>



#include "u_ether.h"

#include "u_ether_configfs.h"

#include "u_rndis.h"

#include "rndis.h"
@@ -903,6 +904,41 @@ void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net) 
}

EXPORT_SYMBOL(rndis_borrow_net);



static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item)

{

	return container_of(to_config_group(item), struct f_rndis_opts,

			    func_inst.group);

}



/* f_rndis_item_ops */

USB_ETHERNET_CONFIGFS_ITEM(rndis);



/* f_rndis_opts_dev_addr */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(rndis);



/* f_rndis_opts_host_addr */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(rndis);



/* f_rndis_opts_qmult */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis);



/* f_rndis_opts_ifname */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis);



static struct configfs_attribute *rndis_attrs[] = {

	&f_rndis_opts_dev_addr.attr,

	&f_rndis_opts_host_addr.attr,

	&f_rndis_opts_qmult.attr,

	&f_rndis_opts_ifname.attr,

	NULL,

};



static struct config_item_type rndis_func_type = {

	.ct_item_ops	= &rndis_item_ops,

	.ct_attrs	= rndis_attrs,

	.ct_owner	= THIS_MODULE,

};



static void rndis_free_inst(struct usb_function_instance *f)

{

	struct f_rndis_opts *opts;
@@ -924,22 +960,30 @@ static struct usb_function_instance *rndis_alloc_inst(void) 
	opts = kzalloc(sizeof(*opts), GFP_KERNEL);

	if (!opts)

		return ERR_PTR(-ENOMEM);



	mutex_init(&opts->lock);

	opts->func_inst.free_func_inst = rndis_free_inst;

	opts->net = gether_setup_default();

	if (IS_ERR(opts->net))

		return ERR_CAST(opts->net);



	config_group_init_type_name(&opts->func_inst.group, "",

				    &rndis_func_type);



	return &opts->func_inst;

}



static void rndis_free(struct usb_function *f)

{

	struct f_rndis *rndis;

	struct f_rndis_opts *opts;



	rndis = func_to_rndis(f);

	rndis_deregister(rndis->config);

	opts = container_of(f->fi, struct f_rndis_opts, func_inst);

	kfree(rndis);

	mutex_lock(&opts->lock);

	opts->refcnt--;

	mutex_unlock(&opts->lock);

}



static void rndis_unbind(struct usb_configuration *c, struct usb_function *f)
@@ -964,12 +1008,15 @@ static struct usb_function *rndis_alloc(struct usb_function_instance *fi) 
		return ERR_PTR(-ENOMEM);



	opts = container_of(fi, struct f_rndis_opts, func_inst);

	mutex_lock(&opts->lock);

	opts->refcnt++;



	gether_get_host_addr_u8(opts->net, rndis->ethaddr);

	rndis->vendorID = opts->vendor_id;

	rndis->manufacturer = opts->manufacturer;



	rndis->port.ioport = netdev_priv(opts->net);

	mutex_unlock(&opts->lock);

	/* RNDIS activates when the host changes this filter */

	rndis->port.cdc_filter = 0;

drivers/usb/gadget/u_rndis.h

+9 −0
Original line number Diff line number Diff line
@@ -25,6 +25,15 @@ struct f_rndis_opts { 
	struct net_device		*net;

	bool				bound;

	bool				borrowed_net;



	/*

	 * Read/write access to configfs attributes is handled by configfs.

	 *

	 * This is to protect the data from concurrent access by read/write

	 * and create symlink/remove symlink.

	 */

	struct mutex			lock;

	int				refcnt;

};



void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net);