]>
Commit | Line | Data |
---|---|---|
e3263ab3 DH |
1 | /* |
2 | * Generic System Framebuffers on x86 | |
3 | * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; either version 2 of the License, or (at your option) | |
8 | * any later version. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Simple-Framebuffer support for x86 systems | |
13 | * Create a platform-device for any available boot framebuffer. The | |
14 | * simple-framebuffer platform device is already available on DT systems, so | |
15 | * this module parses the global "screen_info" object and creates a suitable | |
16 | * platform device compatible with the "simple-framebuffer" DT object. If | |
17 | * the framebuffer is incompatible, we instead create a legacy | |
18 | * "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and | |
19 | * pass the screen_info as platform_data. This allows legacy drivers | |
20 | * to pick these devices up without messing with simple-framebuffer drivers. | |
21 | * The global "screen_info" is still valid at all times. | |
22 | * | |
23 | * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer" | |
24 | * platform devices, but only use legacy framebuffer devices for | |
25 | * backwards compatibility. | |
26 | * | |
27 | * TODO: We set the dev_id field of all platform-devices to 0. This allows | |
28 | * other x86 OF/DT parsers to create such devices, too. However, they must | |
29 | * start at offset 1 for this to work. | |
30 | */ | |
31 | ||
32 | #include <linux/err.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/platform_data/simplefb.h> | |
37 | #include <linux/platform_device.h> | |
38 | #include <linux/screen_info.h> | |
39 | #include <asm/sysfb.h> | |
40 | ||
41 | static __init int sysfb_init(void) | |
42 | { | |
43 | struct screen_info *si = &screen_info; | |
44 | struct simplefb_platform_data mode; | |
45 | struct platform_device *pd; | |
46 | const char *name; | |
47 | bool compatible; | |
48 | int ret; | |
49 | ||
2995e506 DH |
50 | sysfb_apply_efi_quirks(); |
51 | ||
e3263ab3 DH |
52 | /* try to create a simple-framebuffer device */ |
53 | compatible = parse_mode(si, &mode); | |
54 | if (compatible) { | |
55 | ret = create_simplefb(si, &mode); | |
56 | if (!ret) | |
57 | return 0; | |
58 | } | |
59 | ||
60 | /* if the FB is incompatible, create a legacy framebuffer device */ | |
61 | if (si->orig_video_isVGA == VIDEO_TYPE_EFI) | |
62 | name = "efi-framebuffer"; | |
63 | else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB) | |
64 | name = "vesa-framebuffer"; | |
65 | else | |
66 | name = "platform-framebuffer"; | |
67 | ||
68 | pd = platform_device_register_resndata(NULL, name, 0, | |
69 | NULL, 0, si, sizeof(*si)); | |
e8d95ce9 | 70 | return PTR_ERR_OR_ZERO(pd); |
e3263ab3 DH |
71 | } |
72 | ||
2995e506 | 73 | /* must execute after PCI subsystem for EFI quirks */ |
e3263ab3 | 74 | device_initcall(sysfb_init); |