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 31int 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} 83