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 (dp = NULL; 46 (dp = of_get_next_child(parent, dp)) != NULL;) { 47 pname = of_get_property(dp, "name", NULL); 48 if (!pname) 49 continue; 50 len = strlen(pname); 51 if ((pname[len-1] == 'A' && conn == 1) || 52 (pname[len-1] == 'B' && conn == 2)) { 53 for (i = 0; propnames[i] != NULL; ++i) { 54 pedid = of_get_property(dp, 55 propnames[i], NULL); 56 if (pedid != NULL) 57 break; 58 } 59 of_node_put(dp); 60 break; 61 } 62 } 63 } 64 if (pedid == NULL) { 65 for (i = 0; propnames[i] != NULL; ++i) { 66 pedid = of_get_property(parent, propnames[i], NULL); 67 if (pedid != NULL) 68 break; 69 } 70 } 71 if (pedid) { 72 *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL); 73 if (*out_edid == NULL) 74 return -1; 75 printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn); 76 return 0; 77 } 78 return -1; 79 } 80