/*
 * linux/drivers/video/nvidia/nv_of.c
 *
 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
 *
 * Based on rivafb-i2c.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/fb.h>

#include <asm/io.h>

#include "nv_type.h"
#include "nv_local.h"
#include "nv_proto.h"

#include "../edid.h"

int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
{
        struct nvidia_par *par = info->par;
        struct device_node *parent, *dp;
        const unsigned char *pedid = NULL;
        static char *propnames[] = {
                "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
                "EDID,B", "EDID,A", NULL };
        int i;

        parent = pci_device_to_OF_node(par->pci_dev);
        if (parent == NULL)
                return -1;
        if (par->twoHeads) {
                const char *pname;
                int len;

                for_each_child_of_node(parent, dp) {
                        pname = of_get_property(dp, "name", NULL);
                        if (!pname)
                                continue;
                        len = strlen(pname);
                        if ((pname[len-1] == 'A' && conn == 1) ||
                            (pname[len-1] == 'B' && conn == 2)) {
                                for (i = 0; propnames[i] != NULL; ++i) {
                                        pedid = of_get_property(dp,
                                                        propnames[i], NULL);
                                        if (pedid != NULL)
                                                break;
                                }
                                of_node_put(dp);
                                break;
                        }
                }
        }
        if (pedid == NULL) {
                for (i = 0; propnames[i] != NULL; ++i) {
                        pedid = of_get_property(parent, propnames[i], NULL);
                        if (pedid != NULL)
                                break;
                }
        }
        if (pedid) {
                *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
                if (*out_edid == NULL)
                        return -1;
                printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
                return 0;
        }
        return -1;
}