1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * linux/drivers/video/nvidia/nv_of.c
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Based on rivafb-i2c.c
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
9*4882a593Smuzhiyun * License. See the file COPYING in the main directory of this archive
10*4882a593Smuzhiyun * for more details.
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/kernel.h>
15*4882a593Smuzhiyun #include <linux/delay.h>
16*4882a593Smuzhiyun #include <linux/gfp.h>
17*4882a593Smuzhiyun #include <linux/pci.h>
18*4882a593Smuzhiyun #include <linux/fb.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #include <asm/io.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include "nv_type.h"
23*4882a593Smuzhiyun #include "nv_local.h"
24*4882a593Smuzhiyun #include "nv_proto.h"
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #include "../edid.h"
27*4882a593Smuzhiyun
nvidia_probe_of_connector(struct fb_info * info,int conn,u8 ** out_edid)28*4882a593Smuzhiyun int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct nvidia_par *par = info->par;
31*4882a593Smuzhiyun struct device_node *parent, *dp;
32*4882a593Smuzhiyun const unsigned char *pedid = NULL;
33*4882a593Smuzhiyun static char *propnames[] = {
34*4882a593Smuzhiyun "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
35*4882a593Smuzhiyun "EDID,B", "EDID,A", NULL };
36*4882a593Smuzhiyun int i;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun parent = pci_device_to_OF_node(par->pci_dev);
39*4882a593Smuzhiyun if (parent == NULL)
40*4882a593Smuzhiyun return -1;
41*4882a593Smuzhiyun if (par->twoHeads) {
42*4882a593Smuzhiyun const char *pname;
43*4882a593Smuzhiyun int len;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun for (dp = NULL;
46*4882a593Smuzhiyun (dp = of_get_next_child(parent, dp)) != NULL;) {
47*4882a593Smuzhiyun pname = of_get_property(dp, "name", NULL);
48*4882a593Smuzhiyun if (!pname)
49*4882a593Smuzhiyun continue;
50*4882a593Smuzhiyun len = strlen(pname);
51*4882a593Smuzhiyun if ((pname[len-1] == 'A' && conn == 1) ||
52*4882a593Smuzhiyun (pname[len-1] == 'B' && conn == 2)) {
53*4882a593Smuzhiyun for (i = 0; propnames[i] != NULL; ++i) {
54*4882a593Smuzhiyun pedid = of_get_property(dp,
55*4882a593Smuzhiyun propnames[i], NULL);
56*4882a593Smuzhiyun if (pedid != NULL)
57*4882a593Smuzhiyun break;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun of_node_put(dp);
60*4882a593Smuzhiyun break;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun if (pedid == NULL) {
65*4882a593Smuzhiyun for (i = 0; propnames[i] != NULL; ++i) {
66*4882a593Smuzhiyun pedid = of_get_property(parent, propnames[i], NULL);
67*4882a593Smuzhiyun if (pedid != NULL)
68*4882a593Smuzhiyun break;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun if (pedid) {
72*4882a593Smuzhiyun *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
73*4882a593Smuzhiyun if (*out_edid == NULL)
74*4882a593Smuzhiyun return -1;
75*4882a593Smuzhiyun printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun return -1;
79*4882a593Smuzhiyun }
80