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