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USB: gadget: Add EEM gadget driver

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This patch adds a CDC EEM ethernet gadget driver.  CDC EEM is a newer
USB ethernet specification that uses a simpler interface than the older
CDC ECM.  This makes CDC EEM usable by a wider set of USB hardware.
By default the ethernet gadget will still use CDC ECM/Subset, but kernel
configuration and/or a module parameter will allow alternative use of
the CDC EEM protocol.

Changes since last version:
	- Brought in missing RNDIS changes that caused compile error
	- Modified 'sentinel CRC' checking to match EEM host driver

Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Brian Niebuhr
2009-08-14 10:04:22 -05:00
committed by Greg Kroah-Hartman
parent 877accca79
commit 9b39e9dded
8 changed files with 700 additions and 49 deletions
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13
drivers/usb/gadget/rndis.c
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@@ -1022,22 +1022,29 @@ static rndis_resp_t *rndis_add_response (int configNr, u32 length)
return r;
}
int rndis_rm_hdr(struct sk_buff *skb)
int rndis_rm_hdr(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list)
{
/* tmp points to a struct rndis_packet_msg_type */
__le32 *tmp = (void *) skb->data;
/* MessageType, MessageLength */
if (cpu_to_le32(REMOTE_NDIS_PACKET_MSG)
!= get_unaligned(tmp++))
!= get_unaligned(tmp++)) {
dev_kfree_skb_any(skb);
return -EINVAL;
}
tmp++;
/* DataOffset, DataLength */
if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8))
if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
dev_kfree_skb_any(skb);
return -EOVERFLOW;
}
skb_trim(skb, get_unaligned_le32(tmp++));
skb_queue_tail(list, skb);
return 0;
}