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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e3263ab3 DH |
2 | /* |
3 | * Generic System Framebuffers on x86 | |
4 | * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> | |
e3263ab3 DH |
5 | */ |
6 | ||
7 | /* | |
8 | * Simple-Framebuffer support for x86 systems | |
9 | * Create a platform-device for any available boot framebuffer. The | |
10 | * simple-framebuffer platform device is already available on DT systems, so | |
11 | * this module parses the global "screen_info" object and creates a suitable | |
12 | * platform device compatible with the "simple-framebuffer" DT object. If | |
13 | * the framebuffer is incompatible, we instead create a legacy | |
14 | * "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and | |
15 | * pass the screen_info as platform_data. This allows legacy drivers | |
16 | * to pick these devices up without messing with simple-framebuffer drivers. | |
17 | * The global "screen_info" is still valid at all times. | |
18 | * | |
19 | * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer" | |
20 | * platform devices, but only use legacy framebuffer devices for | |
21 | * backwards compatibility. | |
22 | * | |
23 | * TODO: We set the dev_id field of all platform-devices to 0. This allows | |
24 | * other x86 OF/DT parsers to create such devices, too. However, they must | |
25 | * start at offset 1 for this to work. | |
26 | */ | |
27 | ||
28 | #include <linux/err.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/platform_data/simplefb.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/screen_info.h> | |
35 | #include <asm/sysfb.h> | |
36 | ||
37 | static __init int sysfb_init(void) | |
38 | { | |
39 | struct screen_info *si = &screen_info; | |
40 | struct simplefb_platform_data mode; | |
41 | struct platform_device *pd; | |
42 | const char *name; | |
43 | bool compatible; | |
44 | int ret; | |
45 | ||
2995e506 DH |
46 | sysfb_apply_efi_quirks(); |
47 | ||
e3263ab3 DH |
48 | /* try to create a simple-framebuffer device */ |
49 | compatible = parse_mode(si, &mode); | |
50 | if (compatible) { | |
51 | ret = create_simplefb(si, &mode); | |
52 | if (!ret) | |
53 | return 0; | |
54 | } | |
55 | ||
56 | /* if the FB is incompatible, create a legacy framebuffer device */ | |
57 | if (si->orig_video_isVGA == VIDEO_TYPE_EFI) | |
58 | name = "efi-framebuffer"; | |
59 | else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB) | |
60 | name = "vesa-framebuffer"; | |
61 | else | |
62 | name = "platform-framebuffer"; | |
63 | ||
64 | pd = platform_device_register_resndata(NULL, name, 0, | |
65 | NULL, 0, si, sizeof(*si)); | |
e8d95ce9 | 66 | return PTR_ERR_OR_ZERO(pd); |
e3263ab3 DH |
67 | } |
68 | ||
2995e506 | 69 | /* must execute after PCI subsystem for EFI quirks */ |
e3263ab3 | 70 | device_initcall(sysfb_init); |