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 fb_ops ops;
52 /* blit-only rendering path metrics, exposed through sysfs */
53 atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
54 atomic_t bytes_identical; /* saved effort with backbuffer comparison */
55 atomic_t bytes_sent; /* to usb, after compression including overhead */
56 atomic_t cpu_kcycles_used; /* transpired during pixel processing */
57 struct fb_var_screeninfo current_mode;
58 struct list_head deferred_free;
59};
60
61#define NR_USB_REQUEST_I2C_SUB_IO 0x02
62#define NR_USB_REQUEST_CHANNEL 0x12
63
64/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
65#define BULK_SIZE 512
66#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
67#define WRITES_IN_FLIGHT (4)
68
69#define MAX_VENDOR_DESCRIPTOR_SIZE 256
70
71#define GET_URB_TIMEOUT HZ
72#define FREE_URB_TIMEOUT (HZ*2)
73
74#define BPP 2
75#define MAX_CMD_PIXELS 255
76
77#define RLX_HEADER_BYTES 7
78#define MIN_RLX_PIX_BYTES 4
79#define MIN_RLX_CMD_BYTES (RLX_HEADER_BYTES + MIN_RLX_PIX_BYTES)
80
81#define RLE_HEADER_BYTES 6
82#define MIN_RLE_PIX_BYTES 3
83#define MIN_RLE_CMD_BYTES (RLE_HEADER_BYTES + MIN_RLE_PIX_BYTES)
84
85#define RAW_HEADER_BYTES 6
86#define MIN_RAW_PIX_BYTES 2
87#define MIN_RAW_CMD_BYTES (RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)
88
89#define DL_DEFIO_WRITE_DELAY msecs_to_jiffies(HZ <= 300 ? 4 : 10) /* optimal value for 720p video */
90#define DL_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
91
92/* remove these once align.h patch is taken into kernel */
93#define DL_ALIGN_UP(x, a) ALIGN(x, a)
94#define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, a)
95
96#endif
97