pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / video / nvidia / nv_of.c
blob73afd7eb9977b4b34d22254aa3f57bb6199a3426
1 /*
2 * linux/drivers/video/nvidia/nv_of.c
4 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
6 * Based on rivafb-i2c.c
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.
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>
19 #include <asm/io.h>
21 #include <asm/prom.h>
22 #include <asm/pci-bridge.h>
24 #include "nv_type.h"
25 #include "nv_local.h"
26 #include "nv_proto.h"
28 #include "../edid.h"
30 int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
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;
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;
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;
61 of_node_put(dp);
62 break;
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;
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;
80 return -1;