/*
* cdc_ncm.c
*
* Copyright (C) ST-Ericsson 2010-2011
* Contact: Alexey Orishko <alexey.orishko@stericsson.com>
* Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
*
* USB Host Driver for Network Control Model (NCM)
* http://www.usb.org/developers/devclass_docs/NCM10.zip
*
* The NCM encoding, decoding and initialization logic
* derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
*
* This software is available to you under a choice of one of two
* licenses. You may choose this file to be licensed under the terms
* of the GNU General Public License (GPL) Version 2 or the 2-clause
* BSD license listed below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ctype.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/usb.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc.h>
#define DRIVER_VERSION "01-June-2011"
/* CDC NCM subclass 3.2.1 */
#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
/* Maximum NTB length */
#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */
/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
/* Default value for MaxDatagramSize */
#define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */
/*
* Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
* the last NULL entry. Any additional datagrams in NTB would be discarded.
*/
#define CDC_NCM_DPT_DATAGRAMS_MAX 32
/* Maximum amount of IN datagrams in NTB */
#define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */
/* Restart the timer, if amount of datagrams is less than given value */
#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
/* The following macro defines the minimum header space */
#define CDC_NCM_MIN_HDR_SIZE \
(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
struct cdc_ncm_data {
struct usb_cdc_ncm_nth16 nth16;
struct usb_cdc_ncm_ndp16 ndp16;
struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
};
struct cdc_ncm_ctx {
struct cdc_ncm_data rx_ncm;
struct cdc_ncm_data tx_ncm;
struct usb_cdc_ncm_ntb_parameters ncm_parm;
struct timer_list tx_timer;
const struct usb_cdc_ncm_desc *func_desc;
const struct usb_cdc_header_desc *header_desc;
const struct usb_cdc_union_desc *union_desc;
const struct usb_cdc_ether_desc *ether_desc;
struct net_device *netdev;
struct usb_device *udev;
struct usb_host_endpoint *in_ep;
struct usb_host_endpoint *out_ep;
struct usb_host_endpoint *status_ep;
struct usb_interface *intf;
struct usb_interface *control;
struct usb_interface *data;
struct sk_buff *tx_curr_skb;
struct sk_buff *tx_rem_skb;
spinlock_t mtx;
u32 tx_timer_pending;
u32 tx_curr_offset;
u32 tx_curr_last_offset;
u32 tx_curr_frame_num;
u32 rx_speed;
u32 tx_speed;
u32 rx_max;
u32 tx_max;
u32 max_datagram_size;
u16 tx_max_datagrams;
u16 tx_remainder;
u16 tx_modulus;<