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      1 /*
      2  * Copyright  2011 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     18  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
     19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
     20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     22  * DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors:
     25  *    Kristian Hgsberg <krh (at) bitplanet.net>
     26  *    Benjamin Franzke <benjaminfranzke (at) googlemail.com>
     27  */
     28 
     29 #include <stdio.h>
     30 #include <string.h>
     31 
     32 #include <libudev.h>
     33 
     34 #include "gbm_driint.h"
     35 #define DRIVER_MAP_DRI2_ONLY
     36 #include "pci_ids/pci_id_driver_map.h"
     37 
     38 char *
     39 dri_fd_get_driver_name(int fd)
     40 {
     41    struct udev *udev;
     42    struct udev_device *device, *parent;
     43    const char *pci_id;
     44    char *driver = NULL;
     45    int vendor_id, chip_id, i, j;
     46 
     47    udev = udev_new();
     48    device = _gbm_udev_device_new_from_fd(udev, fd);
     49    if (device == NULL)
     50       return NULL;
     51 
     52    parent = udev_device_get_parent(device);
     53    if (parent == NULL) {
     54       fprintf(stderr, "gbm: could not get parent device");
     55       goto out;
     56    }
     57 
     58    pci_id = udev_device_get_property_value(parent, "PCI_ID");
     59    if (pci_id == NULL ||
     60        sscanf(pci_id, "%x:%x", &vendor_id, &chip_id) != 2) {
     61       fprintf(stderr, "gbm: malformed or no PCI ID");
     62       goto out;
     63    }
     64 
     65    for (i = 0; driver_map[i].driver; i++) {
     66       if (vendor_id != driver_map[i].vendor_id)
     67          continue;
     68       if (driver_map[i].num_chips_ids == -1) {
     69          driver = strdup(driver_map[i].driver);
     70          _gbm_log("pci id for %d: %04x:%04x, driver %s",
     71                   fd, vendor_id, chip_id, driver);
     72          goto out;
     73       }
     74 
     75       for (j = 0; j < driver_map[i].num_chips_ids; j++)
     76          if (driver_map[i].chip_ids[j] == chip_id) {
     77             driver = strdup(driver_map[i].driver);
     78             _gbm_log("pci id for %d: %04x:%04x, driver %s",
     79                      fd, vendor_id, chip_id, driver);
     80             goto out;
     81          }
     82    }
     83 
     84 out:
     85    udev_device_unref(device);
     86    udev_unref(udev);
     87 
     88    return driver;
     89 }
     90