// SPDX-License-Identifier: GPL-2.0-or-later /* * Generic System Framebuffers * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> */ /* * Simple-Framebuffer support * 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_SYSFB_SIMPLEFB is not selected, 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 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 <linux/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; /* try to create a simple-framebuffer device */ compatible = sysfb_parse_mode(si, &mode); if (compatible) { ret = sysfb_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_alloc(name, 0); if (!pd) return -ENOMEM; sysfb_apply_efi_quirks(pd); ret = platform_device_add_data(pd, si, sizeof(*si)); if (ret) goto err; ret = platform_device_add(pd); if (ret) goto err; return 0; err: platform_device_put(pd); return ret; } /* must execute after PCI subsystem for EFI quirks */ device_initcall(sysfb_init);