struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct hid_device_info *root = NULL; // return object
struct hid_device_info *cur_dev = NULL;
setlocale(LC_ALL,"");
/* Create the udev object */
udev = udev_new();
if (!udev) {
printf("Can't create udev\n");
return NULL;
}
/* Create a list of the devices in the 'hidraw' subsystem. */
enumerate = udev_enumerate_new(udev);
udev_enumerate_add_match_subsystem(enumerate, "hidraw");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
/* For each item, see if it matches the vid/pid, and if so
create a udev_device record for it */
udev_list_entry_foreach(dev_list_entry, devices) {
const char *sysfs_path;
const char *dev_path;
const char *str;
struct udev_device *hid_dev; // The device's HID udev node.
struct udev_device *dev; // The actual hardware device.
struct udev_device *intf_dev; // The device's interface (in the USB sense).
unsigned short dev_vid;
unsigned short dev_pid;
/* Get the filename of the /sys entry for the device
and create a udev_device object (dev) representing it */
sysfs_path = udev_list_entry_get_name(dev_list_entry);
hid_dev = udev_device_new_from_syspath(udev, sysfs_path);
dev_path = udev_device_get_devnode(hid_dev);
/* The device pointed to by hid_dev contains information about
the hidraw device. In order to get information about the
USB device, get the parent device with the
subsystem/devtype pair of "usb"/"usb_device". This will
be several levels up the tree, but the function will find
it.*/
dev = udev_device_get_parent_with_subsystem_devtype(
hid_dev,
"usb",
"usb_device");
if (!dev) {
/* Unable to find parent usb device. */
goto next;
}
/* Get the VID/PID of the device */
str = udev_device_get_sysattr_value(dev,"idVendor");
dev_vid = (str)? strtol(str, NULL, 16): 0x0;
str = udev_device_get_sysattr_value(dev, "idProduct");
dev_pid = (str)? strtol(str, NULL, 16): 0x0;
/* Check the VID/PID against the arguments */
if ((vendor_id == 0x0 && product_id == 0x0) ||
(vendor_id == dev_vid && product_id == dev_pid)) {
struct hid_device_info *tmp;
size_t len;
/* VID/PID match. Create the record. */
tmp = malloc(sizeof(struct hid_device_info));
if (cur_dev) {
cur_dev->next = tmp;
}
else {
root = tmp;
}
cur_dev = tmp;
/* Fill out the record */
cur_dev->next = NULL;
str = dev_path;
if (str) {
len = strlen(str);
cur_dev->path = calloc(len+1, sizeof(char));
strncpy(cur_dev->path, str, len+1);
cur_dev->path[len] = '\0';
}
else
cur_dev->path = NULL;
/* Serial Number */
cur_dev->serial_number
= copy_udev_string(dev, "serial");
/* Manufacturer and Product strings */
cur_dev->manufacturer_string
= copy_udev_string(dev, "manufacturer");
cur_dev->product_string
= copy_udev_string(dev, "product");
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Release Number */
str = udev_device_get_sysattr_value(dev, "bcdDevice");
cur_dev->release_number = (str)? strtol(str, NULL, 16): 0x0;
/* Interface Number */
cur_dev->interface_number = -1;
/* Get a handle to the interface's udev node. */
intf_dev = udev_device_get_parent_with_subsystem_devtype(
hid_dev,
"usb",
"usb_interface");
if (intf_dev) {
str = udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber");
cur_dev->interface_number = (str)? strtol(str, NULL, 16): -1;
}
}
else
goto next;
next:
udev_device_unref(hid_dev);
/* dev and intf_dev don't need to be (and can't be)
unref()d. It will cause a double-free() error. I'm not
sure why. */
}
/* Free the enumerator and udev objects. */
udev_enumerate_unref(enumerate);
udev_unref(udev);
return root;
}
struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct hid_device_info *root = NULL; /* return object */
struct hid_device_info *cur_dev = NULL;
struct hid_device_info *prev_dev = NULL; /* previous device */
hid_init();
/* Create the udev object */
udev = udev_new();
if (!udev) {
printf("Can't create udev\n");
return NULL;
}
/* Create a list of the devices in the 'hidraw' subsystem. */
enumerate = udev_enumerate_new(udev);
udev_enumerate_add_match_subsystem(enumerate, "hidraw");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
/* For each item, see if it matches the vid/pid, and if so
create a udev_device record for it */
udev_list_entry_foreach(dev_list_entry, devices) {
const char *sysfs_path;
const char *dev_path;
const char *str;
struct udev_device *raw_dev; /* The device's hidraw udev node. */
struct udev_device *hid_dev; /* The device's HID udev node. */
struct udev_device *usb_dev; /* The device's USB udev node. */
struct udev_device *intf_dev; /* The device's interface (in the USB sense). */
unsigned short dev_vid;
unsigned short dev_pid;
char *serial_number_utf8 = NULL;
char *product_name_utf8 = NULL;
int bus_type;
int result;
/* Get the filename of the /sys entry for the device
and create a udev_device object (dev) representing it */
sysfs_path = udev_list_entry_get_name(dev_list_entry);
raw_dev = udev_device_new_from_syspath(udev, sysfs_path);
dev_path = udev_device_get_devnode(raw_dev);
hid_dev = udev_device_get_parent_with_subsystem_devtype(
raw_dev,
"hid",
NULL);
if (!hid_dev) {
/* Unable to find parent hid device. */
goto next;
}
result = parse_uevent_info(
udev_device_get_sysattr_value(hid_dev, "uevent"),
&bus_type,
&dev_vid,
&dev_pid,
&serial_number_utf8,
&product_name_utf8);
if (!result) {
/* parse_uevent_info() failed for at least one field. */
goto next;
}
if (bus_type != BUS_USB && bus_type != BUS_BLUETOOTH) {
/* We only know how to handle USB and BT devices. */
goto next;
}
/* Check the VID/PID against the arguments */
if ((vendor_id == 0x0 || vendor_id == dev_vid) &&
(product_id == 0x0 || product_id == dev_pid)) {
struct hid_device_info *tmp;
/* VID/PID match. Create the record. */
tmp = malloc(sizeof(struct hid_device_info));
if (cur_dev) {
cur_dev->next = tmp;
}
else {
root = tmp;
}
prev_dev = cur_dev;
cur_dev = tmp;
/* Fill out the record */
cur_dev->next = NULL;
cur_dev->path = dev_path? strdup(dev_path): NULL;
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Serial Number */
cur_dev->serial_number = utf8_to_wchar_t(serial_number_utf8);
/* Release Number */
cur_dev->release_number = 0x0;
/* Interface Number */
cur_dev->interface_number = -1;
switch (bus_type) {
case BUS_USB:
/* The device pointed to by raw_dev contains information about
the hidraw device. In order to get information about the
USB device, get the parent device with the
subsystem/devtype pair of "usb"/"usb_device". This will
be several levels up the tree, but the function will find
it. */
usb_dev = udev_device_get_parent_with_subsystem_devtype(
raw_dev,
"usb",
"usb_device");
if (!usb_dev) {
/* Free this device */
free(cur_dev->serial_number);
free(cur_dev->path);
free(cur_dev);
/* Take it off the device list. */
if (prev_dev) {
prev_dev->next = NULL;
cur_dev = prev_dev;
}
else {
cur_dev = root = NULL;
}
goto next;
}
/* Manufacturer and Product strings */
cur_dev->manufacturer_string = copy_udev_string(usb_dev, device_string_names[DEVICE_STRING_MANUFACTURER]);
cur_dev->product_string = copy_udev_string(usb_dev, device_string_names[DEVICE_STRING_PRODUCT]);
/* Release Number */
str = udev_device_get_sysattr_value(usb_dev, "bcdDevice");
cur_dev->release_number = (str)? strtol(str, NULL, 16): 0x0;
/* Get a handle to the interface's udev node. */
intf_dev = udev_device_get_parent_with_subsystem_devtype(
raw_dev,
"usb",
"usb_interface");
if (intf_dev) {
str = udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber");
cur_dev->interface_number = (str)? strtol(str, NULL, 16): -1;
}
break;
case BUS_BLUETOOTH:
/* Manufacturer and Product strings */
cur_dev->manufacturer_string = wcsdup(L"");
cur_dev->product_string = utf8_to_wchar_t(product_name_utf8);
break;
default:
/* Unknown device type - this should never happen, as we
* check for USB and Bluetooth devices above */
break;
}
}
next:
free(serial_number_utf8);
free(product_name_utf8);
udev_device_unref(raw_dev);
/* hid_dev, usb_dev and intf_dev don't need to be (and can't be)
unref()d. It will cause a double-free() error. I'm not
sure why. */
}
/* Free the enumerator and udev objects. */
udev_enumerate_unref(enumerate);
udev_unref(udev);
return root;
}
