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Commit 17b80976 authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
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usb: gadget: f_eem: add configfs support 



f_eem learns about our configfs interface so we
can remove in-kernel gadget drivers in future.

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 998da497

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

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

+15 −0
Original line number Diff line number Diff line
@@ -544,6 +544,21 @@ choice 


# this first set of drivers all depend on bulk-capable hardware.



config USB_CONFIGFS_EEM

	bool "Ethernet Emulation Model (EEM)"

	depends on USB_CONFIGFS

	depends on NET

	select USB_U_ETHER

	select USB_F_EEM

	help

	  CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM

	  and therefore can be supported by more hardware.  Technically ECM and

	  EEM are designed for different applications.  The ECM model extends

	  the network interface to the target (e.g. a USB cable modem), and the

	  EEM model is for mobile devices to communicate with hosts using

	  ethernet over USB.  For Linux gadgets, however, the interface with

	  the host is the same (a usbX device), so the differences are minimal.



config USB_CONFIGFS_PHONET

	boolean "Phonet protocol"

	depends on USB_CONFIGFS

drivers/usb/gadget/f_eem.c

+49 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/slab.h>



#include "u_ether.h"

#include "u_ether_configfs.h"

#include "u_eem.h"



#define EEM_HLEN 2
@@ -263,8 +264,10 @@ static int eem_bind(struct usb_configuration *c, struct usb_function *f) 
	 * with regard to eem_opts->bound access

	 */

	if (!eem_opts->bound) {

		mutex_lock(&eem_opts->lock);

		gether_set_gadget(eem_opts->net, cdev->gadget);

		status = gether_register_netdev(eem_opts->net);

		mutex_unlock(&eem_opts->lock);

		if (status)

			return status;

		eem_opts->bound = true;
@@ -533,6 +536,41 @@ error: 
	return status;

}



static inline struct f_eem_opts *to_f_eem_opts(struct config_item *item)

{

	return container_of(to_config_group(item), struct f_eem_opts,

			    func_inst.group);

}



/* f_eem_item_ops */

USB_ETHERNET_CONFIGFS_ITEM(eem);



/* f_eem_opts_dev_addr */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(eem);



/* f_eem_opts_host_addr */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(eem);



/* f_eem_opts_qmult */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(eem);



/* f_eem_opts_ifname */

USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(eem);



static struct configfs_attribute *eem_attrs[] = {

	&f_eem_opts_dev_addr.attr,

	&f_eem_opts_host_addr.attr,

	&f_eem_opts_qmult.attr,

	&f_eem_opts_ifname.attr,

	NULL,

};



static struct config_item_type eem_func_type = {

	.ct_item_ops	= &eem_item_ops,

	.ct_attrs	= eem_attrs,

	.ct_owner	= THIS_MODULE,

};



static void eem_free_inst(struct usb_function_instance *f)

{

	struct f_eem_opts *opts;
@@ -552,20 +590,28 @@ static struct usb_function_instance *eem_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 = eem_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, "", &eem_func_type);



	return &opts->func_inst;

}



static void eem_free(struct usb_function *f)

{

	struct f_eem *eem;

	struct f_eem_opts *opts;



	eem = func_to_eem(f);

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

	kfree(eem);

	mutex_lock(&opts->lock);

	opts->refcnt--;

	mutex_unlock(&opts->lock);

}



static void eem_unbind(struct usb_configuration *c, struct usb_function *f)
@@ -586,8 +632,11 @@ struct usb_function *eem_alloc(struct usb_function_instance *fi) 
		return ERR_PTR(-ENOMEM);



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

	mutex_lock(&opts->lock);

	opts->refcnt++;



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

	mutex_unlock(&opts->lock);

	eem->port.cdc_filter = DEFAULT_FILTER;



	eem->port.func.name = "cdc_eem";

drivers/usb/gadget/u_eem.h

+9 −0
Original line number Diff line number Diff line
@@ -22,6 +22,15 @@ struct f_eem_opts { 
	struct usb_function_instance	func_inst;

	struct net_device		*net;

	bool				bound;



	/*

	 * 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;

};



#endif /* U_EEM_H */