#ifndef UDLFB_H
  #define UDLFB_H

  /*
   * TODO: Propose standard fb.h ioctl for reporting damage,
   * using _IOWR() and one of the existing area structs from fb.h
   * Consider these ioctls deprecated, but they're still used by the
   * DisplayLink X server as yet - need both to be modified in tandem
   * when new ioctl(s) are ready.
   */
  #define DLFB_IOCTL_RETURN_EDID	 0xAD
  #define DLFB_IOCTL_REPORT_DAMAGE 0xAA
  struct dloarea {
  	int x, y;
  	int w, h;
  	int x2, y2;
  };

  struct urb_node {
  	struct list_head entry;
  	struct dlfb_data *dev;

  	struct delayed_work release_urb_work;

  	struct urb *urb;
  };
  
  struct urb_list {
  	struct list_head list;
  	spinlock_t lock;
  	struct semaphore limit_sem;
  	int available;
  	int count;
  	size_t size;
  };

  struct dlfb_data {
  	struct usb_device *udev;

  	struct device *gdev; /* &udev->dev */

  	struct fb_info *info;

  	struct urb_list urbs;
  	struct kref kref;

  	char *backing_buffer;

  	int fb_count;

  	bool virtualized; /* true when physical usb device not present */
  	struct delayed_work free_framebuffer_work;

  	atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */

  	atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */

  	char *edid; /* null until we read edid from hw or get from sysfs */
  	size_t edid_size;

  	int sku_pixel_limit;

  	int base16;
  	int base8;

  	u32 pseudo_palette[256];

  	int blank_mode; /*one of FB_BLANK_ */

  	/* blit-only rendering path metrics, exposed through sysfs */
  	atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
  	atomic_t bytes_identical; /* saved effort with backbuffer comparison */
  	atomic_t bytes_sent; /* to usb, after compression including overhead */
  	atomic_t cpu_kcycles_used; /* transpired during pixel processing */

  };

  #define NR_USB_REQUEST_I2C_SUB_IO 0x02
  #define NR_USB_REQUEST_CHANNEL 0x12

  /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
  #define BULK_SIZE 512
  #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
  #define WRITES_IN_FLIGHT (4)

  #define MAX_VENDOR_DESCRIPTOR_SIZE 256

  #define GET_URB_TIMEOUT	HZ
  #define FREE_URB_TIMEOUT (HZ*2)

  #define BPP                     2
  #define MAX_CMD_PIXELS		255

  #define RLX_HEADER_BYTES	7
  #define MIN_RLX_PIX_BYTES       4
  #define MIN_RLX_CMD_BYTES	(RLX_HEADER_BYTES + MIN_RLX_PIX_BYTES)

  #define RLE_HEADER_BYTES	6
  #define MIN_RLE_PIX_BYTES	3
  #define MIN_RLE_CMD_BYTES	(RLE_HEADER_BYTES + MIN_RLE_PIX_BYTES)

  #define RAW_HEADER_BYTES	6
  #define MIN_RAW_PIX_BYTES	2
  #define MIN_RAW_CMD_BYTES	(RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)

  #define DL_DEFIO_WRITE_DELAY    5 /* fb_deferred_io.delay in jiffies */
  #define DL_DEFIO_WRITE_DISABLE  (HZ*60) /* "disable" with long delay */

  /* remove these once align.h patch is taken into kernel */
  #define DL_ALIGN_UP(x, a) ALIGN(x, a)
  #define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)

  
  #endif