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usb: gadget: f_eem: add configfs support

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

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>
This commit is contained in:
Andrzej Pietrasiewicz 2013-05-28 09:15:51 +02:00 committed by Felipe Balbi
parent 998da497ec
commit 17b80976f0
4 changed files with 87 additions and 0 deletions
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14
Documentation/ABI/testing/configfs-usb-gadget-eem Normal file
View File

@ -0,0 +1,14 @@
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

15
drivers/usb/gadget/Kconfig
View File

@ -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

49
drivers/usb/gadget/f_eem.c
View File

@ -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";

9
drivers/usb/gadget/u_eem.h
View File

@ -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 */