LXR linux/drivers/video/nvidia/nv

   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