1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Generic System Framebuffers
4 * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
8 * Simple-Framebuffer support
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.
19 * If CONFIG_SYSFB_SIMPLEFB is not selected, never register "simple-framebuffer"
20 * platform devices, but only use legacy framebuffer devices for
21 * backwards compatibility.
23 * TODO: We set the dev_id field of all platform-devices to 0. This allows
24 * other OF/DT parsers to create such devices, too. However, they must
25 * start at offset 1 for this to work.
28 #include <linux/err.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
32 #include <linux/platform_data/simplefb.h>
33 #include <linux/platform_device.h>
34 #include <linux/screen_info.h>
35 #include <linux/sysfb.h>
37 static __init
int sysfb_init(void)
39 struct screen_info
*si
= &screen_info
;
40 struct simplefb_platform_data mode
;
41 struct platform_device
*pd
;
46 /* try to create a simple-framebuffer device */
47 compatible
= sysfb_parse_mode(si
, &mode
);
49 ret
= sysfb_create_simplefb(si
, &mode
);
54 /* if the FB is incompatible, create a legacy framebuffer device */
55 if (si
->orig_video_isVGA
== VIDEO_TYPE_EFI
)
56 name
= "efi-framebuffer";
57 else if (si
->orig_video_isVGA
== VIDEO_TYPE_VLFB
)
58 name
= "vesa-framebuffer";
60 name
= "platform-framebuffer";
62 pd
= platform_device_alloc(name
, 0);
66 sysfb_apply_efi_quirks(pd
);
68 ret
= platform_device_add_data(pd
, si
, sizeof(*si
));
72 ret
= platform_device_add(pd
);
78 platform_device_put(pd
);
82 /* must execute after PCI subsystem for EFI quirks */
83 device_initcall(sysfb_init
);