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