LXR linux/include/video/udlfb.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef UDLFB_H
   3#define UDLFB_H
   4
   5/*
   6 * TODO: Propose standard fb.h ioctl for reporting damage,
   7 * using _IOWR() and one of the existing area structs from fb.h
   8 * Consider these ioctls deprecated, but they're still used by the
   9 * DisplayLink X server as yet - need both to be modified in tandem
  10 * when new ioctl(s) are ready.
  11 */
  12#define DLFB_IOCTL_RETURN_EDID   0xAD
  13#define DLFB_IOCTL_REPORT_DAMAGE 0xAA
  14struct dloarea {
  15        int x, y;
  16        int w, h;
  17        int x2, y2;
  18};
  19
  20struct urb_node {
  21        struct list_head entry;
  22        struct dlfb_data *dlfb;
  23        struct urb *urb;
  24};
  25
  26struct urb_list {
  27        struct list_head list;
  28        spinlock_t lock;
  29        struct semaphore limit_sem;
  30        int available;
  31        int count;
  32        size_t size;
  33};
  34
  35struct dlfb_data {
  36        struct usb_device *udev;
  37        struct fb_info *info;
  38        struct urb_list urbs;
  39        char *backing_buffer;
  40        int fb_count;
  41        bool virtualized; /* true when physical usb device not present */
  42        atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
  43        atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
  44        char *edid; /* null until we read edid from hw or get from sysfs */
  45        size_t edid_size;
  46        int sku_pixel_limit;
  47        int base16;
  48        int base8;
  49        u32 pseudo_palette[256];
  50        int blank_mode; /*one of FB_BLANK_ */
  51        struct mutex render_mutex;
  52        int damage_x;
  53        int damage_y;
  54        int damage_x2;
  55        int damage_y2;
  56        spinlock_t damage_lock;
  57        struct work_struct damage_work;
  58        struct fb_ops ops;
  59        /* blit-only rendering path metrics, exposed through sysfs */
  60        atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
  61        atomic_t bytes_identical; /* saved effort with backbuffer comparison */
  62        atomic_t bytes_sent; /* to usb, after compression including overhead */
  63        atomic_t cpu_kcycles_used; /* transpired during pixel processing */
  64        struct fb_var_screeninfo current_mode;
  65        struct list_head deferred_free;
  66};
  67
  68#define NR_USB_REQUEST_I2C_SUB_IO 0x02
  69#define NR_USB_REQUEST_CHANNEL 0x12
  70
  71/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
  72#define BULK_SIZE 512
  73#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
  74#define WRITES_IN_FLIGHT (4)
  75
  76#define MAX_VENDOR_DESCRIPTOR_SIZE 256
  77
  78#define GET_URB_TIMEOUT HZ
  79#define FREE_URB_TIMEOUT (HZ*2)
  80
  81#define BPP                     2
  82#define MAX_CMD_PIXELS          255
  83
  84#define RLX_HEADER_BYTES        7
  85#define MIN_RLX_PIX_BYTES       4
  86#define MIN_RLX_CMD_BYTES       (RLX_HEADER_BYTES + MIN_RLX_PIX_BYTES)
  87
  88#define RLE_HEADER_BYTES        6
  89#define MIN_RLE_PIX_BYTES       3
  90#define MIN_RLE_CMD_BYTES       (RLE_HEADER_BYTES + MIN_RLE_PIX_BYTES)
  91
  92#define RAW_HEADER_BYTES        6
  93#define MIN_RAW_PIX_BYTES       2
  94#define MIN_RAW_CMD_BYTES       (RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)
  95
  96#define DL_DEFIO_WRITE_DELAY    msecs_to_jiffies(HZ <= 300 ? 4 : 10) /* optimal value for 720p video */
  97#define DL_DEFIO_WRITE_DISABLE  (HZ*60) /* "disable" with long delay */
  98
  99/* remove these once align.h patch is taken into kernel */
 100#define DL_ALIGN_UP(x, a) ALIGN(x, a)
 101#define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, a)
 102
 103#endif
 104