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fp-context: Check hidraw VID/PID with udev instead of an ioctl

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Previously, we checked hidraw devices against drivers by using the
HIDIOCGRAWINFO ioctl. While this works, it's not ideal for doing unit
tests since umockdev would have to implement hidraw ioctls.

The new approach uses the HID_ID property on the parent hid device,
which contains the VID/PID pair.
This commit is contained in:
Matthew Mirvish 2021-06-21 13:39:24 -04:00
parent ba920aa41b
commit a3f568db3d
1 changed files with 8 additions and 17 deletions
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25
libfprint/fp-context.c
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@ -23,16 +23,11 @@
#include "fpi-context.h"
#include "fpi-device.h"
#include <gusb.h>
#include <stdio.h>
#include <config.h>
#ifdef HAVE_UDEV
#include <sys/ioctl.h>
#include <sys/unistd.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <linux/hidraw.h>
#include <gudev/gudev.h>
#endif
@ -521,22 +516,18 @@ fp_context_enumerate (FpContext *context)
{
for (matched_hidraw = hidraw_devices; matched_hidraw; matched_hidraw = matched_hidraw->next)
{
const gchar * devnode = g_udev_device_get_device_file (matched_hidraw->data);
int temp_hid = -1, res;
struct hidraw_devinfo info;
/* Find the parent HID node, and check the vid/pid from its HID_ID property */
g_autoptr(GUdevDevice) parent = g_udev_device_get_parent_with_subsystem (matched_hidraw->data, "hid", NULL);
const gchar * hid_id = g_udev_device_get_property (parent, "HID_ID");
guint32 vendor, product;
if (!devnode)
if (!parent || !hid_id)
continue;
temp_hid = open (devnode, O_RDWR);
if (temp_hid < 0)
if (sscanf (hid_id, "%*X:%X:%X", &vendor, &product) != 2)
continue;
res = ioctl (temp_hid, HIDIOCGRAWINFO, &info);
close (temp_hid);
if (res < 0)
continue;
if (info.vendor == entry->hid_id.vid && info.product == entry->hid_id.pid)
if (vendor == entry->hid_id.vid && product == entry->hid_id.pid)
break;
}
/* If match was not found exit */