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/gfp.h>
17#include <linux/pci.h>
18#include <linux/fb.h>
19
20#include <asm/io.h>
21
22#include "nv_type.h"
23#include "nv_local.h"
24#include "nv_proto.h"
25
26#include "../edid.h"
27
28int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
29{
30	struct nvidia_par *par = info->par;
31	struct device_node *parent, *dp;
32	const unsigned char *pedid = NULL;
33	static char *propnames[] = {
34		"DFP,EDID", "LCD,EDID", "EDID", "EDID1",
35		"EDID,B", "EDID,A", NULL };
36	int i;
37
38	parent = pci_device_to_OF_node(par->pci_dev);
39	if (parent == NULL)
40		return -1;
41	if (par->twoHeads) {
42		const char *pname;
43		int len;
44
45		for (dp = NULL;
46		     (dp = of_get_next_child(parent, dp)) != NULL;) {
47			pname = of_get_property(dp, "name", NULL);
48			if (!pname)
49				continue;
50			len = strlen(pname);
51			if ((pname[len-1] == 'A' && conn == 1) ||
52			    (pname[len-1] == 'B' && conn == 2)) {
53				for (i = 0; propnames[i] != NULL; ++i) {
54					pedid = of_get_property(dp,
55							propnames[i], NULL);
56					if (pedid != NULL)
57						break;
58				}
59				of_node_put(dp);
60				break;
61			}
62		}
63	}
64	if (pedid == NULL) {
65		for (i = 0; propnames[i] != NULL; ++i) {
66			pedid = of_get_property(parent, propnames[i], NULL);
67			if (pedid != NULL)
68				break;
69		}
70	}
71	if (pedid) {
72		*out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
73		if (*out_edid == NULL)
74			return -1;
75		printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
76		return 0;
77	}
78	return -1;
79}
80