sysfb.c (d391c58271072d0b0fad93c82018d495b2633448) | sysfb.c (8633ef82f101c040427b57d4df7b706261420b94) |
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1// SPDX-License-Identifier: GPL-2.0-or-later 2/* | 1// SPDX-License-Identifier: GPL-2.0-or-later 2/* |
3 * Generic System Framebuffers on x86 | 3 * Generic System Framebuffers |
4 * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> 5 */ 6 7/* | 4 * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> 5 */ 6 7/* |
8 * Simple-Framebuffer support for x86 systems | 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. 18 * | 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. 18 * |
19 * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer" | 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. 22 * 23 * TODO: We set the dev_id field of all platform-devices to 0. This allows | 20 * platform devices, but only use legacy framebuffer devices for 21 * backwards compatibility. 22 * 23 * TODO: We set the dev_id field of all platform-devices to 0. This allows |
24 * other x86 OF/DT parsers to create such devices, too. However, they must | 24 * other OF/DT parsers to create such devices, too. However, they must |
25 * start at offset 1 for this to work. 26 */ 27 28#include <linux/err.h> 29#include <linux/init.h> 30#include <linux/kernel.h> 31#include <linux/mm.h> 32#include <linux/platform_data/simplefb.h> --- 5 unchanged lines hidden (view full) --- 38{ 39 struct screen_info *si = &screen_info; 40 struct simplefb_platform_data mode; 41 struct platform_device *pd; 42 const char *name; 43 bool compatible; 44 int ret; 45 | 25 * start at offset 1 for this to work. 26 */ 27 28#include <linux/err.h> 29#include <linux/init.h> 30#include <linux/kernel.h> 31#include <linux/mm.h> 32#include <linux/platform_data/simplefb.h> --- 5 unchanged lines hidden (view full) --- 38{ 39 struct screen_info *si = &screen_info; 40 struct simplefb_platform_data mode; 41 struct platform_device *pd; 42 const char *name; 43 bool compatible; 44 int ret; 45 |
46 sysfb_apply_efi_quirks(); 47 | |
48 /* try to create a simple-framebuffer device */ | 46 /* try to create a simple-framebuffer device */ |
49 compatible = parse_mode(si, &mode); | 47 compatible = sysfb_parse_mode(si, &mode); |
50 if (compatible) { | 48 if (compatible) { |
51 ret = create_simplefb(si, &mode); | 49 ret = sysfb_create_simplefb(si, &mode); |
52 if (!ret) 53 return 0; 54 } 55 56 /* if the FB is incompatible, create a legacy framebuffer device */ 57 if (si->orig_video_isVGA == VIDEO_TYPE_EFI) 58 name = "efi-framebuffer"; 59 else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB) 60 name = "vesa-framebuffer"; 61 else 62 name = "platform-framebuffer"; 63 | 50 if (!ret) 51 return 0; 52 } 53 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"; 59 else 60 name = "platform-framebuffer"; 61 |
64 pd = platform_device_register_resndata(NULL, name, 0, 65 NULL, 0, si, sizeof(*si)); 66 return PTR_ERR_OR_ZERO(pd); | 62 pd = platform_device_alloc(name, 0); 63 if (!pd) 64 return -ENOMEM; 65 66 sysfb_apply_efi_quirks(pd); 67 68 ret = platform_device_add_data(pd, si, sizeof(*si)); 69 if (ret) 70 goto err; 71 72 ret = platform_device_add(pd); 73 if (ret) 74 goto err; 75 76 return 0; 77err: 78 platform_device_put(pd); 79 return ret; |
67} 68 69/* must execute after PCI subsystem for EFI quirks */ 70device_initcall(sysfb_init); | 80} 81 82/* must execute after PCI subsystem for EFI quirks */ 83device_initcall(sysfb_init); |