/*
   *
   * Includes for cdc-acm.c
   *
   * Mainly take from usbnet's cdc-ether part
   *
   */
  
  /*
   * CMSPAR, some architectures can't have space and mark parity.
   */
  
  #ifndef CMSPAR
  #define CMSPAR			0
  #endif
  
  /*
   * Major and minor numbers.
   */
  
  #define ACM_TTY_MAJOR		166
  #define ACM_TTY_MINORS		32
  
  /*
   * Requests.
   */
  
  #define USB_RT_ACM		(USB_TYPE_CLASS | USB_RECIP_INTERFACE)
  
  /*
   * Output control lines.
   */
  
  #define ACM_CTRL_DTR		0x01
  #define ACM_CTRL_RTS		0x02
  
  /*
   * Input control lines and line errors.
   */
  
  #define ACM_CTRL_DCD		0x01
  #define ACM_CTRL_DSR		0x02
  #define ACM_CTRL_BRK		0x04
  #define ACM_CTRL_RI		0x08
  
  #define ACM_CTRL_FRAMING	0x10
  #define ACM_CTRL_PARITY		0x20
  #define ACM_CTRL_OVERRUN	0x40
  
  /*
   * Internal driver structures.
   */
  
  /*
   * The only reason to have several buffers is to accommodate assumptions
   * in line disciplines. They ask for empty space amount, receive our URB size,
   * and proceed to issue several 1-character writes, assuming they will fit.
   * The very first write takes a complete URB. Fortunately, this only happens
   * when processing onlcr, so we only need 2 buffers. These values must be
   * powers of 2.
   */
  #define ACM_NW  16
  #define ACM_NR  16
  
  struct acm_wb {
  	unsigned char *buf;
  	dma_addr_t dmah;
  	int len;
  	int use;
  	struct urb		*urb;
  	struct acm		*instance;
  };
  
  struct acm_rb {
  	int			size;
  	unsigned char		*base;
  	dma_addr_t		dma;
  	int			index;
  	struct acm		*instance;
  };
  
  struct acm {
  	struct usb_device *dev;				/* the corresponding usb device */
  	struct usb_interface *control;			/* control interface */
  	struct usb_interface *data;			/* data interface */
  	struct tty_port port;			 	/* our tty port data */
  	struct urb *ctrlurb;				/* urbs */
  	u8 *ctrl_buffer;				/* buffers of urbs */
  	dma_addr_t ctrl_dma;				/* dma handles of buffers */
  	u8 *country_codes;				/* country codes from device */
  	unsigned int country_code_size;			/* size of this buffer */
  	unsigned int country_rel_date;			/* release date of version */
  	struct acm_wb wb[ACM_NW];
  	unsigned long read_urbs_free;
  	struct urb *read_urbs[ACM_NR];
  	struct acm_rb read_buffers[ACM_NR];
  	int rx_buflimit;
  	int rx_endpoint;
  	spinlock_t read_lock;
  	int write_used;					/* number of non-empty write buffers */
  	int transmitting;
  	spinlock_t write_lock;
  	struct mutex mutex;
  	bool disconnected;
  	struct usb_cdc_line_coding line;		/* bits, stop, parity */
  	struct work_struct work;			/* work queue entry for line discipline waking up */
  	unsigned int ctrlin;				/* input control lines (DCD, DSR, RI, break, overruns) */
  	unsigned int ctrlout;				/* output control lines (DTR, RTS) */
  	struct async_icount iocount;			/* counters for control line changes */
  	struct async_icount oldcount;			/* for comparison of counter */
  	wait_queue_head_t wioctl;			/* for ioctl */
  	unsigned int writesize;				/* max packet size for the output bulk endpoint */
  	unsigned int readsize,ctrlsize;			/* buffer sizes for freeing */
  	unsigned int minor;				/* acm minor number */
  	unsigned char clocal;				/* termios CLOCAL */
  	unsigned int ctrl_caps;				/* control capabilities from the class specific header */
  	unsigned int susp_count;			/* number of suspended interfaces */
  	unsigned int combined_interfaces:1;		/* control and data collapsed */
  	unsigned int is_int_ep:1;			/* interrupt endpoints contrary to spec used */
  	unsigned int throttled:1;			/* actually throttled */
  	unsigned int throttle_req:1;			/* throttle requested */
  	u8 bInterval;
  	struct usb_anchor delayed;			/* writes queued for a device about to be woken */
  };
  
  #define CDC_DATA_INTERFACE_TYPE	0x0a
  
  /* constants describing various quirks and errors */
  #define NO_UNION_NORMAL			1
  #define SINGLE_RX_URB			2
  #define NO_CAP_LINE			4
  #define NOT_A_MODEM			8
  #define NO_DATA_INTERFACE		16
  #define IGNORE_DEVICE			32