1/* SPDX-License-Identifier: MIT */
  2/*
  3 * drm_panel_orientation_quirks.c -- Quirks for non-normal panel orientation
  4 *
  5 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
  6 *
  7 * Note the quirks in this file are shared with fbdev/efifb and as such
  8 * must not depend on other drm code.
  9 */
 10
 11#include <linux/dmi.h>
 12#include <linux/module.h>
 13#include <drm/drm_connector.h>
 14#include <drm/drm_utils.h>
 15
 16#ifdef CONFIG_DMI
 17
 18/*
 19 * Some x86 clamshell design devices use portrait tablet screens and a display
 20 * engine which cannot rotate in hardware, so we need to rotate the fbcon to
 21 * compensate. Unfortunately these (cheap) devices also typically have quite
 22 * generic DMI data, so we match on a combination of DMI data, screen resolution
 23 * and a list of known BIOS dates to avoid false positives.
 24 */
 25
 26struct drm_dmi_panel_orientation_data {
 27	int width;
 28	int height;
 29	const char * const *bios_dates;
 30	int orientation;
 31};
 32
 33static const struct drm_dmi_panel_orientation_data asus_t100ha = {
 34	.width = 800,
 35	.height = 1280,
 36	.orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
 37};
 38
 39static const struct drm_dmi_panel_orientation_data gpd_pocket = {
 40	.width = 1200,
 41	.height = 1920,
 42	.bios_dates = (const char * const []){ "05/26/2017", "06/28/2017",
 43		"07/05/2017", "08/07/2017", NULL },
 44	.orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
 45};
 46
 47static const struct drm_dmi_panel_orientation_data gpd_win = {
 48	.width = 720,
 49	.height = 1280,
 50	.bios_dates = (const char * const []){
 51		"10/25/2016", "11/18/2016", "12/23/2016", "12/26/2016",
 52		"02/21/2017", "03/20/2017", "05/25/2017", NULL },
 53	.orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
 54};
 55
 56static const struct drm_dmi_panel_orientation_data itworks_tw891 = {
 57	.width = 800,
 58	.height = 1280,
 59	.bios_dates = (const char * const []){ "10/16/2015", NULL },
 60	.orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
 61};
 62
 63static const struct drm_dmi_panel_orientation_data vios_lth17 = {
 64	.width = 800,
 65	.height = 1280,
 66	.orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
 67};
 68
 69static const struct dmi_system_id orientation_data[] = {
 70	{	/* Asus T100HA */
 71		.matches = {
 72		  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 73		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100HAN"),
 74		},
 75		.driver_data = (void *)&asus_t100ha,
 76	}, {	/*
 77		 * GPD Pocket, note that the the DMI data is less generic then
 78		 * it seems, devices with a board-vendor of "AMI Corporation"
 79		 * are quite rare, as are devices which have both board- *and*
 80		 * product-id set to "Default String"
 81		 */
 82		.matches = {
 83		  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 84		  DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
 85		  DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
 86		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
 87		},
 88		.driver_data = (void *)&gpd_pocket,
 89	}, {	/* GPD Win (same note on DMI match as GPD Pocket) */
 90		.matches = {
 91		  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 92		  DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
 93		  DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
 94		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
 95		},
 96		.driver_data = (void *)&gpd_win,
 97	}, {	/* I.T.Works TW891 */
 98		.matches = {
 99		  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
100		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "TW891"),
101		  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
102		  DMI_EXACT_MATCH(DMI_BOARD_NAME, "TW891"),
103		},
104		.driver_data = (void *)&itworks_tw891,
105	}, {	/* VIOS LTH17 */
106		.matches = {
107		  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VIOS"),
108		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "LTH17"),
109		},
110		.driver_data = (void *)&vios_lth17,
111	},
112	{}
113};
114
115/**
116 * drm_get_panel_orientation_quirk - Check for panel orientation quirks
117 * @width: width in pixels of the panel
118 * @height: height in pixels of the panel
119 *
120 * This function checks for platform specific (e.g. DMI based) quirks
121 * providing info on panel_orientation for systems where this cannot be
122 * probed from the hard-/firm-ware. To avoid false-positive this function
123 * takes the panel resolution as argument and checks that against the
124 * resolution expected by the quirk-table entry.
125 *
126 * Note this function is also used outside of the drm-subsys, by for example
127 * the efifb code. Because of this this function gets compiled into its own
128 * kernel-module when built as a module.
129 *
130 * Returns:
131 * A DRM_MODE_PANEL_ORIENTATION_* value if there is a quirk for this system,
132 * or DRM_MODE_PANEL_ORIENTATION_UNKNOWN if there is no quirk.
133 */
134int drm_get_panel_orientation_quirk(int width, int height)
135{
136	const struct dmi_system_id *match;
137	const struct drm_dmi_panel_orientation_data *data;
138	const char *bios_date;
139	int i;
140
141	for (match = dmi_first_match(orientation_data);
142	     match;
143	     match = dmi_first_match(match + 1)) {
144		data = match->driver_data;
145
146		if (data->width != width ||
147		    data->height != height)
148			continue;
149
150		if (!data->bios_dates)
151			return data->orientation;
152
153		bios_date = dmi_get_system_info(DMI_BIOS_DATE);
154		if (!bios_date)
155			continue;
156
157		for (i = 0; data->bios_dates[i]; i++) {
158			if (!strcmp(data->bios_dates[i], bios_date))
159				return data->orientation;
160		}
161	}
162
163	return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
164}
165EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
166
167#else
168
169/* There are no quirks for non x86 devices yet */
170int drm_get_panel_orientation_quirk(int width, int height)
171{
172	return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
173}
174EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
175
176#endif
177
178MODULE_LICENSE("Dual MIT/GPL");