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// SPDX-License-Identifier: GPL-2.0-or-later
/*
drm_edid_load.c: use a built-in EDID data set or load it via the firmware
interface
Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
*/
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/drm_connector.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_print.h>
#include "drm_crtc_internal.h"
static char edid_firmware[PATH_MAX];
module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
MODULE_PARM_DESC(edid_firmware,
"Do not probe monitor, use specified EDID blob from /lib/firmware instead.");
static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name)
{
const struct firmware *fw = NULL;
const struct drm_edid *drm_edid;
int err;
err = request_firmware(&fw, name, connector->dev->dev);
if (err) {
drm_err(connector->dev,
"[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n",
connector->base.id, connector->name,
name, err);
return ERR_PTR(err);
}
drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded external firmware EDID \"%s\"\n",
connector->base.id, connector->name, name);
drm_edid = drm_edid_alloc(fw->data, fw->size);
if (!drm_edid_valid(drm_edid)) {
drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name);
drm_edid_free(drm_edid);
drm_edid = ERR_PTR(-EINVAL);
}
release_firmware(fw);
return drm_edid;
}
const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector)
{
char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
const struct drm_edid *drm_edid;
if (edid_firmware[0] == '\0')
return ERR_PTR(-ENOENT);
/*
* If there are multiple edid files specified and separated
* by commas, search through the list looking for one that
* matches the connector.
*
* If there's one or more that doesn't specify a connector, keep
* the last one found one as a fallback.
*/
fwstr = kstrdup(edid_firmware, GFP_KERNEL);
if (!fwstr)
return ERR_PTR(-ENOMEM);
edidstr = fwstr;
while ((edidname = strsep(&edidstr, ","))) {
colon = strchr(edidname, ':');
if (colon != NULL) {
if (strncmp(connector->name, edidname, colon - edidname))
continue;
edidname = colon + 1;
break;
}
if (*edidname != '\0') /* corner case: multiple ',' */
fallback = edidname;
}
if (!edidname) {
if (!fallback) {
kfree(fwstr);
return ERR_PTR(-ENOENT);
}
edidname = fallback;
}
last = edidname + strlen(edidname) - 1;
if (*last == '\n')
*last = '\0';
drm_edid = edid_load(connector, edidname);
kfree(fwstr);
return drm_edid;
}
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