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   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/config.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/fb.h>
  20
  21 #include <asm/io.h>
  22
  23 #include <asm/prom.h>
  24 #include <asm/pci-bridge.h>
  25
  26 #include "nv_type.h"
  27 #include "nv_local.h"
  28 #include "nv_proto.h"
  29
  30 #include "../edid.h"
  31
  32 int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
  33 {
  34         struct nvidia_par *par = info->par;
  35         struct device_node *parent, *dp;
  36         unsigned char *pedid = NULL;
  37         static char *propnames[] = {
  38                 "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
  39                 "EDID,B", "EDID,A", NULL };
  40         int i;
  41
  42         parent = pci_device_to_OF_node(par->pci_dev);
  43         if (parent == NULL)
  44                 return -1;
  45         if (par->twoHeads) {
  46                 char *pname;
  47                 int len;
  48
  49                 for (dp = NULL;
  50                      (dp = of_get_next_child(parent, dp)) != NULL;) {
  51                         pname = (char *)get_property(dp, "name", NULL);
  52                         if (!pname)
  53                                 continue;
  54                         len = strlen(pname);
  55                         if ((pname[len-1] == 'A' && conn == 1) ||
  56                             (pname[len-1] == 'B' && conn == 2)) {
  57                                 for (i = 0; propnames[i] != NULL; ++i) {
  58                                         pedid = (unsigned char *)
  59                                                 get_property(dp, propnames[i],
  60                                                              NULL);
  61                                         if (pedid != NULL)
  62                                                 break;
  63                                 }
  64                                 of_node_put(dp);
  65                                 break;
  66                         }
  67                 }
  68         }
  69         if (pedid == NULL) {
  70                 for (i = 0; propnames[i] != NULL; ++i) {
  71                         pedid = (unsigned char *)
  72                                 get_property(parent, propnames[i], NULL);
  73                         if (pedid != NULL)
  74                                 break;
  75                 }
  76         }
  77         if (pedid) {
  78                 *out_edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
  79                 if (*out_edid == NULL)
  80                         return -1;
  81                 memcpy(*out_edid, pedid, EDID_LENGTH);
  82                 printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
  83                 return 0;
  84         }
  85         return -1;
  86 }