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