Function create_device_info

lib/hidapi/mac/hid.c:653–698

}

static struct hid_device_info *create_device_info(IOHIDDeviceRef device)
{
	const int32_t primary_usage_page = get_int_property(device, CFSTR(kIOHIDPrimaryUsagePageKey));
	const int32_t primary_usage = get_int_property(device, CFSTR(kIOHIDPrimaryUsageKey));

	/* Primary should always be first, to match previous behavior. */
	struct hid_device_info *root = create_device_info_with_usage(device, primary_usage_page, primary_usage);
	struct hid_device_info *cur = root;

	if (!root)
		return NULL;

	CFArrayRef usage_pairs = get_usage_pairs(device);

	if (usage_pairs != NULL) {
		struct hid_device_info *next = NULL;
		for (CFIndex i = 0; i < CFArrayGetCount(usage_pairs); i++) {
			CFTypeRef dict = CFArrayGetValueAtIndex(usage_pairs, i);
			if (CFGetTypeID(dict) != CFDictionaryGetTypeID()) {
				continue;
			}

			CFTypeRef usage_page_ref, usage_ref;
			int32_t usage_page, usage;

			if (!CFDictionaryGetValueIfPresent((CFDictionaryRef)dict, CFSTR(kIOHIDDeviceUsagePageKey), &usage_page_ref) ||
			    !CFDictionaryGetValueIfPresent((CFDictionaryRef)dict, CFSTR(kIOHIDDeviceUsageKey), &usage_ref) ||
					CFGetTypeID(usage_page_ref) != CFNumberGetTypeID() ||
					CFGetTypeID(usage_ref) != CFNumberGetTypeID() ||
					!CFNumberGetValue((CFNumberRef)usage_page_ref, kCFNumberSInt32Type, &usage_page) ||
					!CFNumberGetValue((CFNumberRef)usage_ref, kCFNumberSInt32Type, &usage)) {
					continue;
			}
			if (usage_page == primary_usage_page && usage == primary_usage)
				continue; /* Already added. */

			next = create_device_info_with_usage(device, usage_page, usage);
			cur->next = next;
			if (next != NULL) {
				cur = next;
			}
		}
	}

	return root;
}

struct hid_device_info  HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{