nv_of.c

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/*
 * linux/drivers/video/nvidia/nv_of.c
 *
 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
 *
 * Based on rivafb-i2c.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/fb.h>

#include <asm/io.h>

#include <asm/prom.h>
#include <asm/pci-bridge.h>

#include "nv_type.h"
#include "nv_local.h"
#include "nv_proto.h"

#include "../edid.h"

int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
{
    struct nvidia_par *par = info->par;
    struct device_node *parent, *dp;
    const unsigned char *pedid = NULL;
    static char *propnames[] = {
        "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
        "EDID,B", "EDID,A", NULL };
    int i;

    parent = pci_device_to_OF_node(par->pci_dev);
    if (parent == NULL)
        return -1;
    if (par->twoHeads) {
        const char *pname;
        int len;

        for (dp = NULL;
             (dp = of_get_next_child(parent, dp)) != NULL;) {
            pname = of_get_property(dp, "name", NULL);
            if (!pname)
                continue;
            len = strlen(pname);
            if ((pname[len-1] == 'A' && conn == 1) ||
                (pname[len-1] == 'B' && conn == 2)) {
                for (i = 0; propnames[i] != NULL; ++i) {
                    pedid = of_get_property(dp,
                            propnames[i], NULL);
                    if (pedid != NULL)
                        break;
                }
                of_node_put(dp);
                break;
            }
        }
    }
    if (pedid == NULL) {
        for (i = 0; propnames[i] != NULL; ++i) {
            pedid = of_get_property(parent, propnames[i], NULL);
            if (pedid != NULL)
                break;
        }
    }
    if (pedid) {
        *out_edid = kmemdup(pedid, EDID_LENGTH, GFP_KERNEL);
        if (*out_edid == NULL)
            return -1;
        printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
        return 0;
    }
    return -1;
}