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
nvidia_probe_of_connector(struct fb_info * info,int conn,u8 ** out_edid)28 int 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_each_child_of_node(parent, dp) {
46 pname = of_get_property(dp, "name", NULL);
47 if (!pname)
48 continue;
49 len = strlen(pname);
50 if ((pname[len-1] == 'A' && conn == 1) ||
51 (pname[len-1] == 'B' && conn == 2)) {
52 for (i = 0; propnames[i] != NULL; ++i) {
53 pedid = of_get_property(dp,
54 propnames[i], NULL);
55 if (pedid != NULL)
56 break;
57 }
58 of_node_put(dp);
59 break;
60 }
61 }
62 }
63 if (pedid == NULL) {
64 for (i = 0; propnames[i] != NULL; ++i) {
65 pedid = of_get_property(parent, propnames[i], NULL);
66 if (pedid != NULL)
67 break;
68 }
69 }
70 if (pedid) {
71 *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
72 if (*out_edid == NULL)
73 return -1;
74 printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
75 return 0;
76 }
77 return -1;
78 }
79