mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
645 lines
16 KiB
645 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* f_eem.c -- USB CDC Ethernet (EEM) link function driver |
|
* |
|
* Copyright (C) 2003-2005,2008 David Brownell |
|
* Copyright (C) 2008 Nokia Corporation |
|
* Copyright (C) 2009 EF Johnson Technologies |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/device.h> |
|
#include <linux/etherdevice.h> |
|
#include <linux/crc32.h> |
|
#include <linux/slab.h> |
|
|
|
#include "u_ether.h" |
|
#include "u_ether_configfs.h" |
|
#include "u_eem.h" |
|
|
|
#define EEM_HLEN 2 |
|
|
|
/* |
|
* This function is a "CDC Ethernet Emulation Model" (CDC EEM) |
|
* Ethernet link. |
|
*/ |
|
|
|
struct f_eem { |
|
struct gether port; |
|
u8 ctrl_id; |
|
}; |
|
|
|
static inline struct f_eem *func_to_eem(struct usb_function *f) |
|
{ |
|
return container_of(f, struct f_eem, port.func); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* interface descriptor: */ |
|
|
|
static struct usb_interface_descriptor eem_intf = { |
|
.bLength = sizeof eem_intf, |
|
.bDescriptorType = USB_DT_INTERFACE, |
|
|
|
/* .bInterfaceNumber = DYNAMIC */ |
|
.bNumEndpoints = 2, |
|
.bInterfaceClass = USB_CLASS_COMM, |
|
.bInterfaceSubClass = USB_CDC_SUBCLASS_EEM, |
|
.bInterfaceProtocol = USB_CDC_PROTO_EEM, |
|
/* .iInterface = DYNAMIC */ |
|
}; |
|
|
|
/* full speed support: */ |
|
|
|
static struct usb_endpoint_descriptor eem_fs_in_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_IN, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
}; |
|
|
|
static struct usb_endpoint_descriptor eem_fs_out_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_OUT, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
}; |
|
|
|
static struct usb_descriptor_header *eem_fs_function[] = { |
|
/* CDC EEM control descriptors */ |
|
(struct usb_descriptor_header *) &eem_intf, |
|
(struct usb_descriptor_header *) &eem_fs_in_desc, |
|
(struct usb_descriptor_header *) &eem_fs_out_desc, |
|
NULL, |
|
}; |
|
|
|
/* high speed support: */ |
|
|
|
static struct usb_endpoint_descriptor eem_hs_in_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_IN, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
.wMaxPacketSize = cpu_to_le16(512), |
|
}; |
|
|
|
static struct usb_endpoint_descriptor eem_hs_out_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_OUT, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
.wMaxPacketSize = cpu_to_le16(512), |
|
}; |
|
|
|
static struct usb_descriptor_header *eem_hs_function[] = { |
|
/* CDC EEM control descriptors */ |
|
(struct usb_descriptor_header *) &eem_intf, |
|
(struct usb_descriptor_header *) &eem_hs_in_desc, |
|
(struct usb_descriptor_header *) &eem_hs_out_desc, |
|
NULL, |
|
}; |
|
|
|
/* super speed support: */ |
|
|
|
static struct usb_endpoint_descriptor eem_ss_in_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_IN, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
.wMaxPacketSize = cpu_to_le16(1024), |
|
}; |
|
|
|
static struct usb_endpoint_descriptor eem_ss_out_desc = { |
|
.bLength = USB_DT_ENDPOINT_SIZE, |
|
.bDescriptorType = USB_DT_ENDPOINT, |
|
|
|
.bEndpointAddress = USB_DIR_OUT, |
|
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
|
.wMaxPacketSize = cpu_to_le16(1024), |
|
}; |
|
|
|
static struct usb_ss_ep_comp_descriptor eem_ss_bulk_comp_desc = { |
|
.bLength = sizeof eem_ss_bulk_comp_desc, |
|
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
|
|
|
/* the following 2 values can be tweaked if necessary */ |
|
/* .bMaxBurst = 0, */ |
|
/* .bmAttributes = 0, */ |
|
}; |
|
|
|
static struct usb_descriptor_header *eem_ss_function[] = { |
|
/* CDC EEM control descriptors */ |
|
(struct usb_descriptor_header *) &eem_intf, |
|
(struct usb_descriptor_header *) &eem_ss_in_desc, |
|
(struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, |
|
(struct usb_descriptor_header *) &eem_ss_out_desc, |
|
(struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, |
|
NULL, |
|
}; |
|
|
|
/* string descriptors: */ |
|
|
|
static struct usb_string eem_string_defs[] = { |
|
[0].s = "CDC Ethernet Emulation Model (EEM)", |
|
{ } /* end of list */ |
|
}; |
|
|
|
static struct usb_gadget_strings eem_string_table = { |
|
.language = 0x0409, /* en-us */ |
|
.strings = eem_string_defs, |
|
}; |
|
|
|
static struct usb_gadget_strings *eem_strings[] = { |
|
&eem_string_table, |
|
NULL, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static int eem_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) |
|
{ |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
u16 w_index = le16_to_cpu(ctrl->wIndex); |
|
u16 w_value = le16_to_cpu(ctrl->wValue); |
|
u16 w_length = le16_to_cpu(ctrl->wLength); |
|
|
|
DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", |
|
ctrl->bRequestType, ctrl->bRequest, |
|
w_value, w_index, w_length); |
|
|
|
/* device either stalls (value < 0) or reports success */ |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
|
|
static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
|
{ |
|
struct f_eem *eem = func_to_eem(f); |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
struct net_device *net; |
|
|
|
/* we know alt == 0, so this is an activation or a reset */ |
|
if (alt != 0) |
|
goto fail; |
|
|
|
if (intf == eem->ctrl_id) { |
|
DBG(cdev, "reset eem\n"); |
|
gether_disconnect(&eem->port); |
|
|
|
if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) { |
|
DBG(cdev, "init eem\n"); |
|
if (config_ep_by_speed(cdev->gadget, f, |
|
eem->port.in_ep) || |
|
config_ep_by_speed(cdev->gadget, f, |
|
eem->port.out_ep)) { |
|
eem->port.in_ep->desc = NULL; |
|
eem->port.out_ep->desc = NULL; |
|
goto fail; |
|
} |
|
} |
|
|
|
/* zlps should not occur because zero-length EEM packets |
|
* will be inserted in those cases where they would occur |
|
*/ |
|
eem->port.is_zlp_ok = 1; |
|
eem->port.cdc_filter = DEFAULT_FILTER; |
|
DBG(cdev, "activate eem\n"); |
|
net = gether_connect(&eem->port); |
|
if (IS_ERR(net)) |
|
return PTR_ERR(net); |
|
} else |
|
goto fail; |
|
|
|
return 0; |
|
fail: |
|
return -EINVAL; |
|
} |
|
|
|
static void eem_disable(struct usb_function *f) |
|
{ |
|
struct f_eem *eem = func_to_eem(f); |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
|
|
DBG(cdev, "eem deactivated\n"); |
|
|
|
if (eem->port.in_ep->enabled) |
|
gether_disconnect(&eem->port); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* EEM function driver setup/binding */ |
|
|
|
static int eem_bind(struct usb_configuration *c, struct usb_function *f) |
|
{ |
|
struct usb_composite_dev *cdev = c->cdev; |
|
struct f_eem *eem = func_to_eem(f); |
|
struct usb_string *us; |
|
int status; |
|
struct usb_ep *ep; |
|
|
|
struct f_eem_opts *eem_opts; |
|
|
|
eem_opts = container_of(f->fi, struct f_eem_opts, func_inst); |
|
/* |
|
* in drivers/usb/gadget/configfs.c:configfs_composite_bind() |
|
* configurations are bound in sequence with list_for_each_entry, |
|
* in each configuration its functions are bound in sequence |
|
* with list_for_each_entry, so we assume no race condition |
|
* 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; |
|
} |
|
|
|
us = usb_gstrings_attach(cdev, eem_strings, |
|
ARRAY_SIZE(eem_string_defs)); |
|
if (IS_ERR(us)) |
|
return PTR_ERR(us); |
|
eem_intf.iInterface = us[0].id; |
|
|
|
/* allocate instance-specific interface IDs */ |
|
status = usb_interface_id(c, f); |
|
if (status < 0) |
|
goto fail; |
|
eem->ctrl_id = status; |
|
eem_intf.bInterfaceNumber = status; |
|
|
|
status = -ENODEV; |
|
|
|
/* allocate instance-specific endpoints */ |
|
ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_in_desc); |
|
if (!ep) |
|
goto fail; |
|
eem->port.in_ep = ep; |
|
|
|
ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc); |
|
if (!ep) |
|
goto fail; |
|
eem->port.out_ep = ep; |
|
|
|
/* support all relevant hardware speeds... we expect that when |
|
* hardware is dual speed, all bulk-capable endpoints work at |
|
* both speeds |
|
*/ |
|
eem_hs_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
|
eem_hs_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; |
|
|
|
eem_ss_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
|
eem_ss_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; |
|
|
|
status = usb_assign_descriptors(f, eem_fs_function, eem_hs_function, |
|
eem_ss_function, NULL); |
|
if (status) |
|
goto fail; |
|
|
|
DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n", |
|
gadget_is_superspeed(c->cdev->gadget) ? "super" : |
|
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
|
eem->port.in_ep->name, eem->port.out_ep->name); |
|
return 0; |
|
|
|
fail: |
|
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); |
|
|
|
return status; |
|
} |
|
|
|
static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req) |
|
{ |
|
struct sk_buff *skb = (struct sk_buff *)req->context; |
|
|
|
dev_kfree_skb_any(skb); |
|
} |
|
|
|
/* |
|
* Add the EEM header and ethernet checksum. |
|
* We currently do not attempt to put multiple ethernet frames |
|
* into a single USB transfer |
|
*/ |
|
static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb) |
|
{ |
|
struct sk_buff *skb2 = NULL; |
|
struct usb_ep *in = port->in_ep; |
|
int headroom, tailroom, padlen = 0; |
|
u16 len; |
|
|
|
if (!skb) |
|
return NULL; |
|
|
|
len = skb->len; |
|
headroom = skb_headroom(skb); |
|
tailroom = skb_tailroom(skb); |
|
|
|
/* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0, |
|
* stick two bytes of zero-length EEM packet on the end. |
|
*/ |
|
if (((len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) == 0) |
|
padlen += 2; |
|
|
|
if ((tailroom >= (ETH_FCS_LEN + padlen)) && |
|
(headroom >= EEM_HLEN) && !skb_cloned(skb)) |
|
goto done; |
|
|
|
skb2 = skb_copy_expand(skb, EEM_HLEN, ETH_FCS_LEN + padlen, GFP_ATOMIC); |
|
dev_kfree_skb_any(skb); |
|
skb = skb2; |
|
if (!skb) |
|
return skb; |
|
|
|
done: |
|
/* use the "no CRC" option */ |
|
put_unaligned_be32(0xdeadbeef, skb_put(skb, 4)); |
|
|
|
/* EEM packet header format: |
|
* b0..13: length of ethernet frame |
|
* b14: bmCRC (0 == sentinel CRC) |
|
* b15: bmType (0 == data) |
|
*/ |
|
len = skb->len; |
|
put_unaligned_le16(len & 0x3FFF, skb_push(skb, 2)); |
|
|
|
/* add a zero-length EEM packet, if needed */ |
|
if (padlen) |
|
put_unaligned_le16(0, skb_put(skb, 2)); |
|
|
|
return skb; |
|
} |
|
|
|
/* |
|
* Remove the EEM header. Note that there can be many EEM packets in a single |
|
* USB transfer, so we need to break them out and handle them independently. |
|
*/ |
|
static int eem_unwrap(struct gether *port, |
|
struct sk_buff *skb, |
|
struct sk_buff_head *list) |
|
{ |
|
struct usb_composite_dev *cdev = port->func.config->cdev; |
|
int status = 0; |
|
|
|
do { |
|
struct sk_buff *skb2; |
|
u16 header; |
|
u16 len = 0; |
|
|
|
if (skb->len < EEM_HLEN) { |
|
status = -EINVAL; |
|
DBG(cdev, "invalid EEM header\n"); |
|
goto error; |
|
} |
|
|
|
/* remove the EEM header */ |
|
header = get_unaligned_le16(skb->data); |
|
skb_pull(skb, EEM_HLEN); |
|
|
|
/* EEM packet header format: |
|
* b0..14: EEM type dependent (data or command) |
|
* b15: bmType (0 == data, 1 == command) |
|
*/ |
|
if (header & BIT(15)) { |
|
struct usb_request *req = cdev->req; |
|
u16 bmEEMCmd; |
|
|
|
/* EEM command packet format: |
|
* b0..10: bmEEMCmdParam |
|
* b11..13: bmEEMCmd |
|
* b14: reserved (must be zero) |
|
* b15: bmType (1 == command) |
|
*/ |
|
if (header & BIT(14)) |
|
continue; |
|
|
|
bmEEMCmd = (header >> 11) & 0x7; |
|
switch (bmEEMCmd) { |
|
case 0: /* echo */ |
|
len = header & 0x7FF; |
|
if (skb->len < len) { |
|
status = -EOVERFLOW; |
|
goto error; |
|
} |
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC); |
|
if (unlikely(!skb2)) { |
|
DBG(cdev, "EEM echo response error\n"); |
|
goto next; |
|
} |
|
skb_trim(skb2, len); |
|
put_unaligned_le16(BIT(15) | BIT(11) | len, |
|
skb_push(skb2, 2)); |
|
skb_copy_bits(skb2, 0, req->buf, skb2->len); |
|
req->length = skb2->len; |
|
req->complete = eem_cmd_complete; |
|
req->zero = 1; |
|
req->context = skb2; |
|
if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC)) |
|
DBG(cdev, "echo response queue fail\n"); |
|
break; |
|
|
|
case 1: /* echo response */ |
|
case 2: /* suspend hint */ |
|
case 3: /* response hint */ |
|
case 4: /* response complete hint */ |
|
case 5: /* tickle */ |
|
default: /* reserved */ |
|
continue; |
|
} |
|
} else { |
|
u32 crc, crc2; |
|
struct sk_buff *skb3; |
|
|
|
/* check for zero-length EEM packet */ |
|
if (header == 0) |
|
continue; |
|
|
|
/* EEM data packet format: |
|
* b0..13: length of ethernet frame |
|
* b14: bmCRC (0 == sentinel, 1 == calculated) |
|
* b15: bmType (0 == data) |
|
*/ |
|
len = header & 0x3FFF; |
|
if ((skb->len < len) |
|
|| (len < (ETH_HLEN + ETH_FCS_LEN))) { |
|
status = -EINVAL; |
|
goto error; |
|
} |
|
|
|
/* validate CRC */ |
|
if (header & BIT(14)) { |
|
crc = get_unaligned_le32(skb->data + len |
|
- ETH_FCS_LEN); |
|
crc2 = ~crc32_le(~0, |
|
skb->data, len - ETH_FCS_LEN); |
|
} else { |
|
crc = get_unaligned_be32(skb->data + len |
|
- ETH_FCS_LEN); |
|
crc2 = 0xdeadbeef; |
|
} |
|
if (crc != crc2) { |
|
DBG(cdev, "invalid EEM CRC\n"); |
|
goto next; |
|
} |
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC); |
|
if (unlikely(!skb2)) { |
|
DBG(cdev, "unable to unframe EEM packet\n"); |
|
continue; |
|
} |
|
skb_trim(skb2, len - ETH_FCS_LEN); |
|
|
|
skb3 = skb_copy_expand(skb2, |
|
NET_IP_ALIGN, |
|
0, |
|
GFP_ATOMIC); |
|
if (unlikely(!skb3)) { |
|
dev_kfree_skb_any(skb2); |
|
continue; |
|
} |
|
dev_kfree_skb_any(skb2); |
|
skb_queue_tail(list, skb3); |
|
} |
|
next: |
|
skb_pull(skb, len); |
|
} while (skb->len); |
|
|
|
error: |
|
dev_kfree_skb_any(skb); |
|
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[] = { |
|
&eem_opts_attr_dev_addr, |
|
&eem_opts_attr_host_addr, |
|
&eem_opts_attr_qmult, |
|
&eem_opts_attr_ifname, |
|
NULL, |
|
}; |
|
|
|
static const 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; |
|
|
|
opts = container_of(f, struct f_eem_opts, func_inst); |
|
if (opts->bound) |
|
gether_cleanup(netdev_priv(opts->net)); |
|
else |
|
free_netdev(opts->net); |
|
kfree(opts); |
|
} |
|
|
|
static struct usb_function_instance *eem_alloc_inst(void) |
|
{ |
|
struct f_eem_opts *opts; |
|
|
|
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)) { |
|
struct net_device *net = opts->net; |
|
kfree(opts); |
|
return ERR_CAST(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) |
|
{ |
|
DBG(c->cdev, "eem unbind\n"); |
|
|
|
usb_free_all_descriptors(f); |
|
} |
|
|
|
static struct usb_function *eem_alloc(struct usb_function_instance *fi) |
|
{ |
|
struct f_eem *eem; |
|
struct f_eem_opts *opts; |
|
|
|
/* allocate and initialize one new instance */ |
|
eem = kzalloc(sizeof(*eem), GFP_KERNEL); |
|
if (!eem) |
|
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"; |
|
/* descriptors are per-instance copies */ |
|
eem->port.func.bind = eem_bind; |
|
eem->port.func.unbind = eem_unbind; |
|
eem->port.func.set_alt = eem_set_alt; |
|
eem->port.func.setup = eem_setup; |
|
eem->port.func.disable = eem_disable; |
|
eem->port.func.free_func = eem_free; |
|
eem->port.wrap = eem_wrap; |
|
eem->port.unwrap = eem_unwrap; |
|
eem->port.header_len = EEM_HLEN; |
|
|
|
return &eem->port.func; |
|
} |
|
|
|
DECLARE_USB_FUNCTION_INIT(eem, eem_alloc_inst, eem_alloc); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("David Brownell");
|
|
|