// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
|
*/
|
/*
|
* generic EDID driver
|
*/
|
|
#include <linux/slab.h>
|
#include <linux/fb.h>
|
#include "via_aux.h"
|
#include "../edid.h"
|
|
|
static const char *name = "EDID";
|
|
|
static void query_edid(struct via_aux_drv *drv)
|
{
|
struct fb_monspecs *spec = drv->data;
|
unsigned char edid[EDID_LENGTH];
|
bool valid = false;
|
|
if (spec) {
|
fb_destroy_modedb(spec->modedb);
|
} else {
|
spec = kmalloc(sizeof(*spec), GFP_KERNEL);
|
if (!spec)
|
return;
|
}
|
|
spec->version = spec->revision = 0;
|
if (via_aux_read(drv, 0x00, edid, EDID_LENGTH)) {
|
fb_edid_to_monspecs(edid, spec);
|
valid = spec->version || spec->revision;
|
}
|
|
if (!valid) {
|
kfree(spec);
|
spec = NULL;
|
} else
|
printk(KERN_DEBUG "EDID: %s %s\n", spec->manufacturer, spec->monitor);
|
|
drv->data = spec;
|
}
|
|
static const struct fb_videomode *get_preferred_mode(struct via_aux_drv *drv)
|
{
|
struct fb_monspecs *spec = drv->data;
|
int i;
|
|
if (!spec || !spec->modedb || !(spec->misc & FB_MISC_1ST_DETAIL))
|
return NULL;
|
|
for (i = 0; i < spec->modedb_len; i++) {
|
if (spec->modedb[i].flag & FB_MODE_IS_FIRST &&
|
spec->modedb[i].flag & FB_MODE_IS_DETAILED)
|
return &spec->modedb[i];
|
}
|
|
return NULL;
|
}
|
|
static void cleanup(struct via_aux_drv *drv)
|
{
|
struct fb_monspecs *spec = drv->data;
|
|
if (spec)
|
fb_destroy_modedb(spec->modedb);
|
}
|
|
void via_aux_edid_probe(struct via_aux_bus *bus)
|
{
|
struct via_aux_drv drv = {
|
.bus = bus,
|
.addr = 0x50,
|
.name = name,
|
.cleanup = cleanup,
|
.get_preferred_mode = get_preferred_mode};
|
|
query_edid(&drv);
|
|
/* as EDID devices can be connected/disconnected just add the driver */
|
via_aux_add(&drv);
|
}
|
