/*
 * pci.c - PCI functions for X-Sys
 * Copyright (C) 1997-1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz> [PCI routines from lspci]
 * Copyright (C) 2000 Tom Rini <trini@kernel.crashing.org> [XorgAutoConfig pci.c, based on lspci]
 * Copyright (C) 2005, 2006 Tony Vroon
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <pci/pci.h>
#include "xsys.h"

#define PCIIDS "/usr/share/misc/pci.ids"

static struct pci_filter filter;       /* Device filter */
static struct pci_access *pacc;
int bus, dev, func; /* Location of the card */

struct device {
  	struct device *next;
  	struct pci_dev *dev;
  	unsigned int config_cnt;
  	u8 config[256];
};

static struct device *first_dev;

static struct device *scan_device(struct pci_dev *p)
{
  	int how_much = 64;
  	struct device *d;

  	if (!pci_filter_match(&filter, p))
    		return NULL;
  	d = malloc(sizeof(struct device));
  	bzero(d, sizeof(*d));
  	d->dev = p;
  	if (!pci_read_block(p, 0, d->config, how_much))
    		exit(1);
  	if (how_much < 128 && (d->config[PCI_HEADER_TYPE] & 0x7f) == PCI_HEADER_TYPE_CARDBUS) {
      		/* For cardbus bridges, we need to fetch 64 bytes more to get the full standard header... */
      		if (!pci_read_block(p, 64, d->config+64, 64))
        		exit(1);
      		how_much = 128;
    	}
  	d->config_cnt = how_much;
  	pci_setup_cache(p, d->config, d->config_cnt);
  	pci_fill_info(p, PCI_FILL_IDENT);
  	return d;
}

static void scan_devices(void)
{
  	struct device *d;
  	struct pci_dev *p;

  	pci_scan_bus(pacc);
  	for(p=pacc->devices; p; p=p->next)
    	if ((d = scan_device(p))) {
        	d->next = first_dev;
        	first_dev = d;
      	}
}

static u16 get_conf_word(struct device *d, unsigned int pos)
{
  	return d->config[pos] | (d->config[pos+1] << 8);
}

int pci_find_by_class(u16 *class, char *vendor, char *device)
{
	struct device *d;
	struct pci_dev *p;
	int nomatch = 1;

	pacc = pci_alloc();
	pci_filter_init(pacc, &filter);
	pci_init(pacc);
	scan_devices();

	for(d=first_dev; d; d=d->next) {
    		p = d->dev;
    		/* Acquire vendor & device ID if the class matches */
    		if(get_conf_word(d, PCI_CLASS_DEVICE) == *class) {
      			nomatch = 0;
			snprintf(vendor,7,"%04x",p->vendor_id);
			snprintf(device,7,"%04x",p->device_id);
      			break;
    		}
  	}

  	pci_cleanup(pacc);
  	return nomatch;
}

void pci_find_fullname(char *fullname, char *vendor, char *device)
{
	char buffer[bsize], vendorname[bsize/2] = "", devicename[bsize/2] = "", *position;
	int cardfound = 0;
	FILE *fp = fopen(PCIIDS, "r");
	if(fp == NULL) {
		snprintf(fullname, bsize, "%s:%s", vendor, device);	
		return;
	}

	while(fgets(buffer, bsize, fp) != NULL)	{
		if (!isspace(buffer[0]) && strstr(buffer, vendor) != NULL) {
                       	position = strstr(buffer, vendor);
                       	position += 6;
                       	strncpy(vendorname, position, bsize/2);
                       	position = strstr(vendorname, "\n");
                       	*(position) = '\0';
			break;
                }
	}
	while(fgets(buffer, bsize, fp) != NULL) {
		if(strstr(buffer, device) != NULL) {
                        position = strstr(buffer, device);
                        position += 6;
                        strncpy(devicename, position, bsize/2);
			position = strstr(devicename, " (");
			if (position == NULL)
                        	position = strstr(devicename, "\n");
                        *(position) = '\0';
			cardfound = 1;
			break;
 		}
	}
	if (cardfound == 1)
		snprintf(fullname, bsize, "%s %s", vendorname, devicename);
	else
		snprintf(fullname, bsize, "%s:%s", vendor, device);	
	fclose(fp);
}