1/*
2 * linux/drivers/video/nvidia/nv_of.c
3 *
4 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
5 *
6 * Based on rivafb-i2c.c
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/delay.h>
16#include <linux/pci.h>
17#include <linux/fb.h>
18
19#include <asm/io.h>
20
21#include <asm/prom.h>
22#include <asm/pci-bridge.h>
23
24#include "nv_type.h"
25#include "nv_local.h"
26#include "nv_proto.h"
27
28#include "../edid.h"
29
30int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
31{
32	struct nvidia_par *par = info->par;
33	struct device_node *parent, *dp;
34	const unsigned char *pedid = NULL;
35	static char *propnames[] = {
36		"DFP,EDID", "LCD,EDID", "EDID", "EDID1",
37		"EDID,B", "EDID,A", NULL };
38	int i;
39
40	parent = pci_device_to_OF_node(par->pci_dev);
41	if (parent == NULL)
42		return -1;
43	if (par->twoHeads) {
44		const char *pname;
45		int len;
46
47		for (dp = NULL;
48		     (dp = of_get_next_child(parent, dp)) != NULL;) {
49			pname = of_get_property(dp, "name", NULL);
50			if (!pname)
51				continue;
52			len = strlen(pname);
53			if ((pname[len-1] == 'A' && conn == 1) ||
54			    (pname[len-1] == 'B' && conn == 2)) {
55				for (i = 0; propnames[i] != NULL; ++i) {
56					pedid = of_get_property(dp,
57							propnames[i], NULL);
58					if (pedid != NULL)
59						break;
60				}
61				of_node_put(dp);
62				break;
63			}
64		}
65	}
66	if (pedid == NULL) {
67		for (i = 0; propnames[i] != NULL; ++i) {
68			pedid = of_get_property(parent, propnames[i], NULL);
69			if (pedid != NULL)
70				break;
71		}
72	}
73	if (pedid) {
74		*out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
75		if (*out_edid == NULL)
76			return -1;
77		printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
78		return 0;
79	}
80	return -1;
81}
82