1 /*
2 * fbcon_dmi_quirks.c -- DMI based quirk detection for fbcon
3 *
4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
8 * more details.
9 */
10
11 #include <linux/dmi.h>
12 #include <linux/fb.h>
13 #include <linux/kernel.h>
14 #include "fbcon.h"
15
16 /*
17 * Some x86 clamshell design devices use portrait tablet screens and a display
18 * engine which cannot rotate in hardware, so we need to rotate the fbcon to
19 * compensate. Unfortunately these (cheap) devices also typically have quite
20 * generic DMI data, so we match on a combination of DMI data, screen resolution
21 * and a list of known BIOS dates to avoid false positives.
22 */
23
24 struct fbcon_dmi_rotate_data {
25 int width;
26 int height;
27 const char * const *bios_dates;
28 int rotate;
29 };
30
31 static const struct fbcon_dmi_rotate_data rotate_data_asus_t100ha = {
32 .width = 800,
33 .height = 1280,
34 .rotate = FB_ROTATE_CCW,
35 };
36
37 static const struct fbcon_dmi_rotate_data rotate_data_gpd_pocket = {
38 .width = 1200,
39 .height = 1920,
40 .bios_dates = (const char * const []){ "05/26/2017", "06/28/2017",
41 "07/05/2017", "08/07/2017", NULL },
42 .rotate = FB_ROTATE_CW,
43 };
44
45 static const struct fbcon_dmi_rotate_data rotate_data_gpd_win = {
46 .width = 720,
47 .height = 1280,
48 .bios_dates = (const char * const []){
49 "10/25/2016", "11/18/2016", "12/23/2016", "12/26/2016",
50 "02/21/2017", "03/20/2017", "05/25/2017", NULL },
51 .rotate = FB_ROTATE_CW,
52 };
53
54 static const struct fbcon_dmi_rotate_data rotate_data_itworks_tw891 = {
55 .width = 800,
56 .height = 1280,
57 .bios_dates = (const char * const []){ "10/16/2015", NULL },
58 .rotate = FB_ROTATE_CW,
59 };
60
61 static const struct fbcon_dmi_rotate_data rotate_data_vios_lth17 = {
62 .width = 800,
63 .height = 1280,
64 .rotate = FB_ROTATE_CW,
65 };
66
67 static const struct dmi_system_id rotate_data[] = {
68 { /* Asus T100HA */
69 .matches = {
70 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
71 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100HAN"),
72 },
73 .driver_data = (void *)&rotate_data_asus_t100ha,
74 }, { /*
75 * GPD Pocket, note that the the DMI data is less generic then
76 * it seems, devices with a board-vendor of "AMI Corporation"
77 * are quite rare, as are devices which have both board- *and*
78 * product-id set to "Default String"
79 */
80 .matches = {
81 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
82 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
83 DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
84 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
85 },
86 .driver_data = (void *)&rotate_data_gpd_pocket,
87 }, { /* GPD Win (same note on DMI match as GPD Pocket) */
88 .matches = {
89 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
90 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
91 DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
92 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
93 },
94 .driver_data = (void *)&rotate_data_gpd_win,
95 }, { /* I.T.Works TW891 */
96 .matches = {
97 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
98 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "TW891"),
99 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
100 DMI_EXACT_MATCH(DMI_BOARD_NAME, "TW891"),
101 },
102 .driver_data = (void *)&rotate_data_itworks_tw891,
103 }, { /* VIOS LTH17 */
104 .matches = {
105 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VIOS"),
106 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "LTH17"),
107 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "VIOS"),
108 DMI_EXACT_MATCH(DMI_BOARD_NAME, "LTH17"),
109 },
110 .driver_data = (void *)&rotate_data_vios_lth17,
111 },
112 {}
113 };
114
fbcon_platform_get_rotate(struct fb_info * info)115 int fbcon_platform_get_rotate(struct fb_info *info)
116 {
117 const struct dmi_system_id *match;
118 const struct fbcon_dmi_rotate_data *data;
119 const char *bios_date;
120 int i;
121
122 for (match = dmi_first_match(rotate_data);
123 match;
124 match = dmi_first_match(match + 1)) {
125 data = match->driver_data;
126
127 if (data->width != info->var.xres ||
128 data->height != info->var.yres)
129 continue;
130
131 if (!data->bios_dates)
132 return data->rotate;
133
134 bios_date = dmi_get_system_info(DMI_BIOS_DATE);
135 if (!bios_date)
136 continue;
137
138 for (i = 0; data->bios_dates[i]; i++) {
139 if (!strcmp(data->bios_dates[i], bios_date))
140 return data->rotate;
141 }
142 }
143
144 return FB_ROTATE_UR;
145 }
146