/*
   * USB Networking Link Interface
   *
   * Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
   * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #ifndef	__LINUX_USB_USBNET_H
  #define	__LINUX_USB_USBNET_H
  
  /* interface from usbnet core to each USB networking link we handle */
  struct usbnet {
  	/* housekeeping */
  	struct usb_device	*udev;
  	struct usb_interface	*intf;
  	struct driver_info	*driver_info;
  	const char		*driver_name;
  	void			*driver_priv;
  	wait_queue_head_t	wait;
  	struct mutex		phy_mutex;
  	unsigned char		suspend_count;
  	unsigned char		pkt_cnt, pkt_err;
  	unsigned short		rx_qlen, tx_qlen;
  	unsigned		can_dma_sg:1;
  
  	/* i/o info: pipes etc */
  	unsigned		in, out;
  	struct usb_host_endpoint *status;
  	unsigned		maxpacket;
  	struct timer_list	delay;
  	const char		*padding_pkt;
  
  	/* protocol/interface state */
  	struct net_device	*net;
  	int			msg_enable;
  	unsigned long		data[5];
  	u32			xid;
  	u32			hard_mtu;	/* count any extra framing */
  	size_t			rx_urb_size;	/* size for rx urbs */
  	struct mii_if_info	mii;
  
  	/* various kinds of pending driver work */
  	struct sk_buff_head	rxq;
  	struct sk_buff_head	txq;
  	struct sk_buff_head	done;
  	struct sk_buff_head	rxq_pause;
  	struct urb		*interrupt;
  	unsigned		interrupt_count;
  	struct mutex		interrupt_mutex;
  	struct usb_anchor	deferred;
  	struct tasklet_struct	bh;
  
  	struct work_struct	kevent;
  	unsigned long		flags;
  #		define EVENT_TX_HALT	0
  #		define EVENT_RX_HALT	1
  #		define EVENT_RX_MEMORY	2
  #		define EVENT_STS_SPLIT	3
  #		define EVENT_LINK_RESET	4
  #		define EVENT_RX_PAUSED	5
  #		define EVENT_DEV_ASLEEP 6
  #		define EVENT_DEV_OPEN	7
  #		define EVENT_DEVICE_REPORT_IDLE	8
  #		define EVENT_NO_RUNTIME_PM	9
  #		define EVENT_RX_KILL	10
  #		define EVENT_LINK_CHANGE	11
  };
  
  static inline struct usb_driver *driver_of(struct usb_interface *intf)
  {
  	return to_usb_driver(intf->dev.driver);
  }
  
  /* interface from the device/framing level "minidriver" to core */
  struct driver_info {
  	char		*description;
  
  	int		flags;
  /* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
  #define FLAG_FRAMING_NC	0x0001		/* guard against device dropouts */
  #define FLAG_FRAMING_GL	0x0002		/* genelink batches packets */
  #define FLAG_FRAMING_Z	0x0004		/* zaurus adds a trailer */
  #define FLAG_FRAMING_RN	0x0008		/* RNDIS batches, plus huge header */
  
  #define FLAG_NO_SETINT	0x0010		/* device can't set_interface() */
  #define FLAG_ETHER	0x0020		/* maybe use "eth%d" names */
  
  #define FLAG_FRAMING_AX 0x0040		/* AX88772/178 packets */
  #define FLAG_WLAN	0x0080		/* use "wlan%d" names */
  #define FLAG_AVOID_UNLINK_URBS 0x0100	/* don't unlink urbs at usbnet_stop() */
  #define FLAG_SEND_ZLP	0x0200		/* hw requires ZLPs are sent */
  #define FLAG_WWAN	0x0400		/* use "wwan%d" names */
  
  #define FLAG_LINK_INTR	0x0800		/* updates link (carrier) status */
  
  #define FLAG_POINTTOPOINT 0x1000	/* possibly use "usb%d" names */
  
  /*
   * Indicates to usbnet, that USB driver accumulates multiple IP packets.
   * Affects statistic (counters) and short packet handling.
   */
  #define FLAG_MULTI_PACKET	0x2000
  #define FLAG_RX_ASSEMBLE	0x4000	/* rx packets may span >1 frames */
  #define FLAG_NOARP		0x8000	/* device can't do ARP */
  
  	/* init device ... can sleep, or cause probe() failure */
  	int	(*bind)(struct usbnet *, struct usb_interface *);
  
  	/* cleanup device ... can sleep, but can't fail */
  	void	(*unbind)(struct usbnet *, struct usb_interface *);
  
  	/* reset device ... can sleep */
  	int	(*reset)(struct usbnet *);
  
  	/* stop device ... can sleep */
  	int	(*stop)(struct usbnet *);
  
  	/* see if peer is connected ... can sleep */
  	int	(*check_connect)(struct usbnet *);
  
  	/* (dis)activate runtime power management */
  	int	(*manage_power)(struct usbnet *, int);
  
  	/* for status polling */
  	void	(*status)(struct usbnet *, struct urb *);
  
  	/* link reset handling, called from defer_kevent */
  	int	(*link_reset)(struct usbnet *);
  
  	/* fixup rx packet (strip framing) */
  	int	(*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
  
  	/* fixup tx packet (add framing) */
  	struct sk_buff	*(*tx_fixup)(struct usbnet *dev,
  				struct sk_buff *skb, gfp_t flags);
  
  	/* early initialization code, can sleep. This is for minidrivers
  	 * having 'subminidrivers' that need to do extra initialization
  	 * right after minidriver have initialized hardware. */
  	int	(*early_init)(struct usbnet *dev);
  
  	/* called by minidriver when receiving indication */
  	void	(*indication)(struct usbnet *dev, void *ind, int indlen);
  
  	/* for new devices, use the descriptor-reading code instead */
  	int		in;		/* rx endpoint */
  	int		out;		/* tx endpoint */
  
  	unsigned long	data;		/* Misc driver specific data */
  };
  
  /* Minidrivers are just drivers using the "usbnet" core as a powerful
   * network-specific subroutine library ... that happens to do pretty
   * much everything except custom framing and chip-specific stuff.
   */
  extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
  extern int usbnet_suspend(struct usb_interface *, pm_message_t);
  extern int usbnet_resume(struct usb_interface *);
  extern void usbnet_disconnect(struct usb_interface *);
  extern void usbnet_device_suggests_idle(struct usbnet *dev);
  
  extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
  		    u16 value, u16 index, void *data, u16 size);
  extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
  		    u16 value, u16 index, const void *data, u16 size);
  extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
  		    u16 value, u16 index, void *data, u16 size);
  extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
  		    u16 value, u16 index, const void *data, u16 size);
  extern int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
  		    u16 value, u16 index, const void *data, u16 size);
  
  /* Drivers that reuse some of the standard USB CDC infrastructure
   * (notably, using multiple interfaces according to the CDC
   * union descriptor) get some helper code.
   */
  struct cdc_state {
  	struct usb_cdc_header_desc	*header;
  	struct usb_cdc_union_desc	*u;
  	struct usb_cdc_ether_desc	*ether;
  	struct usb_interface		*control;
  	struct usb_interface		*data;
  };
  
  extern int usbnet_generic_cdc_bind(struct usbnet *, struct usb_interface *);
  extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *);
  extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *);
  extern void usbnet_cdc_status(struct usbnet *, struct urb *);
  
  /* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
  #define	DEFAULT_FILTER	(USB_CDC_PACKET_TYPE_BROADCAST \
  			|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
  			|USB_CDC_PACKET_TYPE_PROMISCUOUS \
  			|USB_CDC_PACKET_TYPE_DIRECTED)
  
  
  /* we record the state for each of our queued skbs */
  enum skb_state {
  	illegal = 0,
  	tx_start, tx_done,
  	rx_start, rx_done, rx_cleanup,
  	unlink_start
  };
  
  struct skb_data {	/* skb->cb is one of these */
  	struct urb		*urb;
  	struct usbnet		*dev;
  	enum skb_state		state;
  	size_t			length;
  };
  
  extern int usbnet_open(struct net_device *net);
  extern int usbnet_stop(struct net_device *net);
  extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb,
  				     struct net_device *net);
  extern void usbnet_tx_timeout(struct net_device *net);
  extern int usbnet_change_mtu(struct net_device *net, int new_mtu);
  
  extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
  extern int usbnet_get_ethernet_addr(struct usbnet *, int);
  extern void usbnet_defer_kevent(struct usbnet *, int);
  extern void usbnet_skb_return(struct usbnet *, struct sk_buff *);
  extern void usbnet_unlink_rx_urbs(struct usbnet *);
  
  extern void usbnet_pause_rx(struct usbnet *);
  extern void usbnet_resume_rx(struct usbnet *);
  extern void usbnet_purge_paused_rxq(struct usbnet *);
  
  extern int usbnet_get_settings(struct net_device *net,
  			       struct ethtool_cmd *cmd);
  extern int usbnet_set_settings(struct net_device *net,
  			       struct ethtool_cmd *cmd);
  extern u32 usbnet_get_link(struct net_device *net);
  extern u32 usbnet_get_msglevel(struct net_device *);
  extern void usbnet_set_msglevel(struct net_device *, u32);
  extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
  extern int usbnet_nway_reset(struct net_device *net);
  
  extern int usbnet_manage_power(struct usbnet *, int);
  extern void usbnet_link_change(struct usbnet *, bool, bool);
  
  extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
  extern void usbnet_status_stop(struct usbnet *dev);
  
  extern void usbnet_update_max_qlen(struct usbnet *dev);
  
  #endif /* __LINUX_USB_USBNET_H */