--- /dev/null
+/* SPDX-License-Identifier: MIT */
+/*
+ * drm_panel_orientation_quirks.c -- Quirks for non-normal panel orientation
+ *
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Note the quirks in this file are shared with fbdev/efifb and as such
+ * must not depend on other drm code.
+ */
+
+#include <linux/dmi.h>
+#include <drm/drm_connector.h>
+
+#ifdef CONFIG_DMI
+
+/*
+ * Some x86 clamshell design devices use portrait tablet screens and a display
+ * engine which cannot rotate in hardware, so we need to rotate the fbcon to
+ * compensate. Unfortunately these (cheap) devices also typically have quite
+ * generic DMI data, so we match on a combination of DMI data, screen resolution
+ * and a list of known BIOS dates to avoid false positives.
+ */
+
+struct drm_dmi_panel_orientation_data {
+ int width;
+ int height;
+ const char * const *bios_dates;
+ int orientation;
+};
+
+static const struct drm_dmi_panel_orientation_data asus_t100ha = {
+ .width = 800,
+ .height = 1280,
+ .orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
+};
+
+static const struct drm_dmi_panel_orientation_data gpd_pocket = {
+ .width = 1200,
+ .height = 1920,
+ .bios_dates = (const char * const []){ "05/26/2017", "06/28/2017",
+ "07/05/2017", "08/07/2017", NULL },
+ .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
+};
+
+static const struct drm_dmi_panel_orientation_data gpd_win = {
+ .width = 720,
+ .height = 1280,
+ .bios_dates = (const char * const []){
+ "10/25/2016", "11/18/2016", "12/23/2016", "12/26/2016",
+ "02/21/2017", "03/20/2017", "05/25/2017", NULL },
+ .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
+};
+
+static const struct drm_dmi_panel_orientation_data itworks_tw891 = {
+ .width = 800,
+ .height = 1280,
+ .bios_dates = (const char * const []){ "10/16/2015", NULL },
+ .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
+};
+
+static const struct drm_dmi_panel_orientation_data vios_lth17 = {
+ .width = 800,
+ .height = 1280,
+ .orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
+};
+
+static const struct dmi_system_id orientation_data[] = {
+ { /* Asus T100HA */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100HAN"),
+ },
+ .driver_data = (void *)&asus_t100ha,
+ }, { /*
+ * GPD Pocket, note that the the DMI data is less generic then
+ * it seems, devices with a board-vendor of "AMI Corporation"
+ * are quite rare, as are devices which have both board- *and*
+ * product-id set to "Default String"
+ */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
+ DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
+ },
+ .driver_data = (void *)&gpd_pocket,
+ }, { /* GPD Win (same note on DMI match as GPD Pocket) */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
+ DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
+ },
+ .driver_data = (void *)&gpd_win,
+ }, { /* I.T.Works TW891 */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "TW891"),
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "TW891"),
+ },
+ .driver_data = (void *)&itworks_tw891,
+ }, { /* VIOS LTH17 */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VIOS"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "LTH17"),
+ },
+ .driver_data = (void *)&vios_lth17,
+ },
+ {}
+};
+
+/**
+ * drm_get_panel_orientation_quirk - Check for panel orientation quirks
+ * @width: width in pixels of the panel
+ * @height: height in pixels of the panel
+ *
+ * This function checks for platform specific (e.g. DMI based) quirks
+ * providing info on panel_orientation for systems where this cannot be
+ * probed from the hard-/firm-ware. To avoid false-positive this function
+ * takes the panel resolution as argument and checks that against the
+ * resolution expected by the quirk-table entry.
+ *
+ * Note this function is also used outside of the drm-subsys, by for example
+ * the efifb code. Because of this this function gets compiled into its own
+ * kernel-module when built as a module.
+ *
+ * Returns:
+ * A DRM_MODE_PANEL_ORIENTATION_* value if there is a quirk for this system,
+ * or DRM_MODE_PANEL_ORIENTATION_UNKNOWN if there is no quirk.
+ */
+int drm_get_panel_orientation_quirk(int width, int height)
+{
+ const struct dmi_system_id *match;
+ const struct drm_dmi_panel_orientation_data *data;
+ const char *bios_date;
+ int i;
+
+ for (match = dmi_first_match(orientation_data);
+ match;
+ match = dmi_first_match(match + 1)) {
+ data = match->driver_data;
+
+ if (data->width != width ||
+ data->height != height)
+ continue;
+
+ if (!data->bios_dates)
+ return data->orientation;
+
+ bios_date = dmi_get_system_info(DMI_BIOS_DATE);
+ if (!bios_date)
+ continue;
+
+ for (i = 0; data->bios_dates[i]; i++) {
+ if (!strcmp(data->bios_dates[i], bios_date))
+ return data->orientation;
+ }
+ }
+
+ return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+}
+EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
+
+#else
+
+/* There are no quirks for non x86 devices yet */
+int drm_get_panel_orientation_quirk(int width, int height)
+{
+ return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+}
+EXPORT_SYMBOL(drm_get_panel_orientation_quirk);
+
+#endif
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