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
  14 struct dloarea {
  15         int x, y;
  16         int w, h;
  17         int x2, y2;
  18 };
  19
  20 struct urb_node {
  21         struct list_head entry;
  22         struct dlfb_data *dlfb;
  23         struct urb *urb;
  24 };
  25
  26 struct 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
  35 struct 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