fbdev/nvidia/nv_of.c

0001 /*
0002  * linux/drivers/video/nvidia/nv_of.c
0003  *
0004  * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
0005  *
0006  * Based on rivafb-i2c.c
0007  *
0008  * This file is subject to the terms and conditions of the GNU General Public
0009  * License.  See the file COPYING in the main directory of this archive
0010  * for more details.
0011  */
0012
0013 #include <linux/module.h>
0014 #include <linux/kernel.h>
0015 #include <linux/delay.h>
0016 #include <linux/gfp.h>
0017 #include <linux/pci.h>
0018 #include <linux/fb.h>
0019
0020 #include <asm/io.h>
0021
0022 #include "nv_type.h"
0023 #include "nv_local.h"
0024 #include "nv_proto.h"
0025
0026 #include "../edid.h"
0027
0028 int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
0029 {
0030     struct nvidia_par *par = info->par;
0031     struct device_node *parent, *dp;
0032     const unsigned char *pedid = NULL;
0033     static char *propnames[] = {
0034         "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
0035         "EDID,B", "EDID,A", NULL };
0036     int i;
0037
0038     parent = pci_device_to_OF_node(par->pci_dev);
0039     if (parent == NULL)
0040         return -1;
0041     if (par->twoHeads) {
0042         const char *pname;
0043         int len;
0044
0045         for_each_child_of_node(parent, dp) {
0046             pname = of_get_property(dp, "name", NULL);
0047             if (!pname)
0048                 continue;
0049             len = strlen(pname);
0050             if ((pname[len-1] == 'A' && conn == 1) ||
0051                 (pname[len-1] == 'B' && conn == 2)) {
0052                 for (i = 0; propnames[i] != NULL; ++i) {
0053                     pedid = of_get_property(dp,
0054                             propnames[i], NULL);
0055                     if (pedid != NULL)
0056                         break;
0057                 }
0058                 of_node_put(dp);
0059                 break;
0060             }
0061         }
0062     }
0063     if (pedid == NULL) {
0064         for (i = 0; propnames[i] != NULL; ++i) {
0065             pedid = of_get_property(parent, propnames[i], NULL);
0066             if (pedid != NULL)
0067                 break;
0068         }
0069     }
0070     if (pedid) {
0071         *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
0072         if (*out_edid == NULL)
0073             return -1;
0074         printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
0075         return 0;
0076     }
0077     return -1;
0078 }