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 28 int 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_each_child_of_node(parent, dp) { 46 pname = of_get_property(dp, "name", NULL); 47 if (!pname) 48 continue; 49 len = strlen(pname); 50 if ((pname[len-1] == 'A' && conn == 1) || 51 (pname[len-1] == 'B' && conn == 2)) { 52 for (i = 0; propnames[i] != NULL; ++i) { 53 pedid = of_get_property(dp, 54 propnames[i], NULL); 55 if (pedid != NULL) 56 break; 57 } 58 of_node_put(dp); 59 break; 60 } 61 } 62 } 63 if (pedid == NULL) { 64 for (i = 0; propnames[i] != NULL; ++i) { 65 pedid = of_get_property(parent, propnames[i], NULL); 66 if (pedid != NULL) 67 break; 68 } 69 } 70 if (pedid) { 71 *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL); 72 if (*out_edid == NULL) 73 return -1; 74 printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn); 75 return 0; 76 } 77 return -1; 78 } 79