source: rtems/cpukit/libpci/pci_find_dev.c @ 358b8543

/*  PCI Help function, Find a PCI device by VENDOR/DEVICE ID
 *
 *  COPYRIGHT (c) 2010.
 *  Cobham Gaisler AB.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 */

#include <pci.h>
#include <pci/cfg.h>

struct compare_info {
        int index;
        uint16_t vendor;
        uint16_t device;
};

static int compare_dev_id(struct pci_dev *dev, void *arg)
{
        struct compare_info *info = arg;

        if ((dev->vendor != info->vendor) || (dev->device != info->device))
                return 0;
        if (info->index-- == 0)
                return (int)dev;
        else
                return 0;
}

/* Find a Device in PCI device tree located in RAM */
int pci_find_dev(uint16_t ven, uint16_t dev, int index, struct pci_dev **ppdev)
{
        struct compare_info info;
        int result;

        info.index = index;
        info.vendor = ven;
        info.device = dev;

        result = pci_for_each_dev(compare_dev_id, &info);
        if (ppdev)
                *ppdev = (struct pci_dev *)result;
        if (result == 0)
                return -1;
        else
                return 0;
}