drivers/video/nvidia/nv_of.c

   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 <asm/prom.h>
  23 #include <asm/pci-bridge.h>
  24
  25 #include "nv_type.h"
  26 #include "nv_local.h"
  27 #include "nv_proto.h"
  28
  29 #include "../edid.h"
  30
  31 int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
  32 {
  33         struct nvidia_par *par = info->par;
  34         struct device_node *parent, *dp;
  35         const unsigned char *pedid = NULL;
  36         static char *propnames[] = {
  37                 "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
  38                 "EDID,B", "EDID,A", NULL };
  39         int i;
  40
  41         parent = pci_device_to_OF_node(par->pci_dev);
  42         if (parent == NULL)
  43                 return -1;
  44         if (par->twoHeads) {
  45                 const char *pname;
  46                 int len;
  47
  48                 for (dp = NULL;
  49                      (dp = of_get_next_child(parent, dp)) != NULL;) {
  50                         pname = of_get_property(dp, "name", NULL);
  51                         if (!pname)
  52                                 continue;
  53                         len = strlen(pname);
  54                         if ((pname[len-1] == 'A' && conn == 1) ||
  55                             (pname[len-1] == 'B' && conn == 2)) {
  56                                 for (i = 0; propnames[i] != NULL; ++i) {
  57                                         pedid = of_get_property(dp,
  58                                                         propnames[i], NULL);
  59                                         if (pedid != NULL)
  60                                                 break;
  61                                 }
  62                                 of_node_put(dp);
  63                                 break;
  64                         }
  65                 }
  66         }
  67         if (pedid == NULL) {
  68                 for (i = 0; propnames[i] != NULL; ++i) {
  69                         pedid = of_get_property(parent, propnames[i], NULL);
  70                         if (pedid != NULL)
  71                                 break;
  72                 }
  73         }
  74         if (pedid) {
  75                 *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
  76                 if (*out_edid == NULL)
  77                         return -1;
  78                 printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
  79                 return 0;
  80         }
  81         return -1;
  82 }