/*
* Copyright (C) ST-Ericsson 2010-2012
* Contact: Alexey Orishko <[email protected]>
* Original author: Hans Petter Selasky <[email protected]>
*
* 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.
*/

#ifndef __LINUX_USB_CDC_NCM_H
#define __LINUX_USB_CDC_NCM_H

#define CDC_NCM_COMM_ALTSETTING_NCM 0
#define CDC_NCM_COMM_ALTSETTING_MBIM 1

#define CDC_NCM_DATA_ALTSETTING_NCM 1
#define CDC_NCM_DATA_ALTSETTING_MBIM 2

/* CDC NCM subclass 3.2.1 */
#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10

/* Maximum NTB length */
#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */

/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */

/* Minimum value for MaxDatagramSize, ch. 8.1.3 */
#define CDC_MBIM_MIN_DATAGRAM_SIZE 2048 /* bytes */

#define CDC_NCM_MIN_TX_PKT 512 /* bytes */

/* Default value for MaxDatagramSize */
#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */

/*
* Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
* the last NULL entry.
*/
#define CDC_NCM_DPT_DATAGRAMS_MAX 40

/* Restart the timer, if amount of datagrams is less than given value */
#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
#define CDC_NCM_TIMER_PENDING_CNT 2
#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)

/* 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))

#define CDC_NCM_NDP_SIZE \
(sizeof(struct usb_cdc_ncm_ndp16) + \
(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))

#define cdc_ncm_comm_intf_is_mbim(x) ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
(x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
#define cdc_ncm_data_intf_is_mbim(x) ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)

struct cdc_ncm_ctx {
struct hrtimer tx_timer;
struct tasklet_struct bh;

const struct usb_cdc_ncm_desc *func_desc;
const struct usb_cdc_mbim_desc *mbim_desc;
const struct usb_cdc_ether_desc *ether_desc;

struct usb_interface *control;
struct usb_interface *data;

struct sk_buff *tx_curr_skb;
struct sk_buff *tx_rem_skb;
__le32 tx_rem_sign;

spinlock_t mtx;
atomic_t stop;

u32 tx_timer_pending;
u32 tx_curr_frame_num;
u32 rx_max;
u32 tx_max;
u32 max_datagram_size;
u16 tx_max_datagrams;
u16 tx_remainder;
u16 tx_modulus;
u16 tx_ndp_modulus;
u16 tx_seq;
u16 rx_seq;
u16 connected;
};

u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf);
int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting);
void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
struct sk_buff *cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign);
int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
struct sk_buff *
cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags);
int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in);

#endif /* __LINUX_USB_CDC_NCM_H */