mirror of https://gitee.com/openkylin/linux.git
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
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/*
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* Generic System Framebuffers on x86
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* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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/*
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* Simple-Framebuffer support for x86 systems
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* Create a platform-device for any available boot framebuffer. The
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* simple-framebuffer platform device is already available on DT systems, so
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* this module parses the global "screen_info" object and creates a suitable
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* platform device compatible with the "simple-framebuffer" DT object. If
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* the framebuffer is incompatible, we instead create a legacy
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* "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and
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* pass the screen_info as platform_data. This allows legacy drivers
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* to pick these devices up without messing with simple-framebuffer drivers.
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* The global "screen_info" is still valid at all times.
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*
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* If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer"
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* platform devices, but only use legacy framebuffer devices for
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* backwards compatibility.
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*
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* TODO: We set the dev_id field of all platform-devices to 0. This allows
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* other x86 OF/DT parsers to create such devices, too. However, they must
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* start at offset 1 for this to work.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/platform_data/simplefb.h>
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#include <linux/platform_device.h>
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#include <linux/screen_info.h>
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#include <asm/sysfb.h>
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static __init int sysfb_init(void)
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{
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struct screen_info *si = &screen_info;
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struct simplefb_platform_data mode;
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struct platform_device *pd;
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const char *name;
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bool compatible;
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int ret;
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/* try to create a simple-framebuffer device */
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compatible = parse_mode(si, &mode);
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if (compatible) {
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ret = create_simplefb(si, &mode);
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if (!ret)
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return 0;
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}
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/* if the FB is incompatible, create a legacy framebuffer device */
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if (si->orig_video_isVGA == VIDEO_TYPE_EFI)
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name = "efi-framebuffer";
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else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
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name = "vesa-framebuffer";
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else
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name = "platform-framebuffer";
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pd = platform_device_register_resndata(NULL, name, 0,
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NULL, 0, si, sizeof(*si));
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return IS_ERR(pd) ? PTR_ERR(pd) : 0;
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}
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device_initcall(sysfb_init);
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