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// SPDX-License-Identifier: GPL-2.0
#include <linux/array_size.h>
#include <linux/dmi.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <drm/drm_edid.h>
#include <drm/drm_utils.h>
struct drm_panel_min_backlight_quirk {
struct {
enum dmi_field field;
const char * const value;
} dmi_match;
struct drm_edid_ident ident;
u8 min_brightness;
};
static const struct drm_panel_min_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",
.min_brightness = 0,
},
/* 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",
.min_brightness = 0,
},
/* 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",
.min_brightness = 0,
},
};
static bool drm_panel_min_backlight_quirk_matches(const struct drm_panel_min_backlight_quirk *quirk,
const struct drm_edid *edid)
{
if (!dmi_match(quirk->dmi_match.field, quirk->dmi_match.value))
return false;
if (!drm_edid_match(edid, &quirk->ident))
return false;
return true;
}
/**
* drm_get_panel_min_brightness_quirk - Get minimum supported brightness level 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.
*
* Returns:
* A negative error value or
* an override value in the range [0, 255] representing 0-100% to be scaled to
* the drivers target range.
*/
int drm_get_panel_min_brightness_quirk(const struct drm_edid *edid)
{
const struct drm_panel_min_backlight_quirk *quirk;
size_t i;
if (!IS_ENABLED(CONFIG_DMI))
return -ENODATA;
if (!edid)
return -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->min_brightness;
}
return -ENODATA;
}
EXPORT_SYMBOL(drm_get_panel_min_brightness_quirk);
MODULE_DESCRIPTION("Quirks for panel backlight overrides");
MODULE_LICENSE("GPL");
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