tools/power/cpupower/utils/helpers/pci.c

   1 #if defined(__i386__) || defined(__x86_64__)
   2
   3 #include <helpers/helpers.h>
   4
   5 /*
   6  * pci_acc_init
   7  *
   8  * PCI access helper function depending on libpci
   9  *
  10  * **pacc : if a valid pci_dev is returned
  11  *         *pacc must be passed to pci_acc_cleanup to free it
  12  *
  13  * vendor_id : the pci vendor id matching the pci device to access
  14  * dev_ids :   device ids matching the pci device to access
  15  *
  16  * Returns :
  17  * struct pci_dev which can be used with pci_{read,write}_* functions
  18  *                to access the PCI config space of matching pci devices
  19  */
  20 struct pci_dev *pci_acc_init(struct pci_access **pacc, int vendor_id,
  21                                     int *dev_ids)
  22 {
  23         struct pci_filter filter_nb_link = { -1, -1, -1, -1, vendor_id, 0};
  24         struct pci_dev *device;
  25         unsigned int i;
  26
  27         *pacc = pci_alloc();
  28         if (*pacc == NULL)
  29                 return NULL;
  30
  31         pci_init(*pacc);
  32         pci_scan_bus(*pacc);
  33
  34         for (i = 0; dev_ids[i] != 0; i++) {
  35                 filter_nb_link.device = dev_ids[i];
  36                 for (device = (*pacc)->devices; device; device = device->next) {
  37                         if (pci_filter_match(&filter_nb_link, device))
  38                                 return device;
  39                 }
  40         }
  41         pci_cleanup(*pacc);
  42         return NULL;
  43 }
  44 #endif /* defined(__i386__) || defined(__x86_64__) */