LXR linux/drivers/video/fbdev/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/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