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// SPDX-License-Identifier: GPL-2.0
#include <linux/array_size.h>
#include <linux/dmi.h>
#include <linux/export.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <drm/drm_edid.h>
#include <drm/drm_utils.h>
struct drm_panel_match {
enum dmi_field field;
const char * const value;
};
struct drm_get_panel_backlight_quirk {
struct drm_panel_match dmi_match;
struct drm_panel_match dmi_match_other;
struct drm_edid_ident ident;
struct drm_panel_backlight_quirk quirk;
};
static const struct drm_get_panel_backlight_quirk drm_panel_min_backlight_quirks[] = {
/* 13 inch matte panel */
{
.dmi_match.field = DMI_BOARD_VENDOR,
.dmi_match.value = "Framework",
.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0bca),
.ident.name = "NE135FBM-N41",
.quirk = { .min_brightness = 1, },
},
/* 13 inch glossy panel */
{
.dmi_match.field = DMI_BOARD_VENDOR,
.dmi_match.value = "Framework",
.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x095f),
.ident.name = "NE135FBM-N41",
.quirk = { .min_brightness = 1, },
},
/* 13 inch 2.8k panel */
{
.dmi_match.field = DMI_BOARD_VENDOR,
.dmi_match.value = "Framework",
.ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0cb4),
.ident.name = "NE135A1M-NY1",
.quirk = { .min_brightness = 1, },
},
};
static bool drm_panel_min_backlight_quirk_matches(
const struct drm_get_panel_backlight_quirk *quirk,
const struct drm_edid *edid)
{
if (quirk->dmi_match.field &&
!dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
return false;
if (quirk->dmi_match_other.field &&
!dmi_match(quirk->dmi_match_other.field,
quirk->dmi_match_other.value))
return false;
if (quirk->ident.panel_id && !drm_edid_match(edid, &quirk->ident))
return false;
return true;
}
/**
* drm_get_panel_backlight_quirk - Get backlight quirks for a panel
* @edid: EDID of the panel to check
*
* This function checks for platform specific (e.g. DMI based) quirks
* providing info on the minimum backlight brightness for systems where this
* cannot be probed correctly from the hard-/firm-ware and other sources.
*
* Returns:
* a drm_panel_backlight_quirk struct if a quirk was found, otherwise an
* error pointer.
*/
const struct drm_panel_backlight_quirk *
drm_get_panel_backlight_quirk(const struct drm_edid *edid)
{
const struct drm_get_panel_backlight_quirk *quirk;
size_t i;
if (!IS_ENABLED(CONFIG_DMI))
return ERR_PTR(-ENODATA);
if (!edid)
return ERR_PTR(-EINVAL);
for (i = 0; i < ARRAY_SIZE(drm_panel_min_backlight_quirks); i++) {
quirk = &drm_panel_min_backlight_quirks[i];
if (drm_panel_min_backlight_quirk_matches(quirk, edid))
return &quirk->quirk;
}
return ERR_PTR(-ENODATA);
}
EXPORT_SYMBOL(drm_get_panel_backlight_quirk);
MODULE_DESCRIPTION("Quirks for panel backlight overrides");
MODULE_LICENSE("GPL");
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