1#include "gamepad.h"
 2#include "common/io.h"
 3
 4#include <stdio.h>
 5#include <fcntl.h>
 6#include <usbhid.h>
 7
 8#if __has_include(<dev/usb/usb_ioctl.h>)
 9    #include <dev/usb/usb_ioctl.h> // FreeBSD
10#else
11    #include <bus/u4b/usb_ioctl.h> // DragonFly
12#endif
13
14#define MAX_UHID_JOYS 64
15
16const char* ffDetectGamepad(FFlist* devices /* List of FFGamepadDevice */) {
17    char path[16];
18    for (int i = 0; i < MAX_UHID_JOYS; i++) {
19        snprintf(path, ARRAY_SIZE(path), "/dev/uhid%d", i);
20        FF_AUTO_CLOSE_FD int fd = open(path, O_RDONLY | O_CLOEXEC);
21        if (fd < 0) {
22            if (errno == ENOENT) {
23                break; // No more devices
24            }
25            continue; // Device not found
26        }
27        report_desc_t repDesc = hid_get_report_desc(fd);
28        if (!repDesc) {
29            continue;
30        }
31
32        int reportId = hid_get_report_id(fd);
33
34        struct hid_data* hData = hid_start_parse(repDesc, 0, reportId);
35        if (hData) {
36            struct hid_item hItem;
37            while (hid_get_item(hData, &hItem) > 0) {
38                if (HID_PAGE(hItem.usage) != 1) {
39                    continue;
40                }
41                switch (HID_USAGE(hItem.usage)) {
42                    case 1: // Pointer. FreeBSD returns 1 for my Pro Controller for some reason
43                    case 4: // Joystick
44                    case 5: // Gamepad
45                        break;
46                    default:
47                        continue;
48                }
49
50                struct usb_device_info di;
51                if (ioctl(fd, USB_GET_DEVICEINFO, &di) != -1) {
52                    FFGamepadDevice* device = FF_LIST_ADD(FFGamepadDevice, *devices);
53                    ffStrbufInitS(&device->serial, di.udi_serial);
54                    ffStrbufInitF(&device->name, "%s %s", di.udi_vendor, di.udi_product);
55                    device->battery = 0;
56                }
57            }
58            hid_end_parse(hData);
59        }
60
61        hid_dispose_report_desc(repDesc);
62    }
63
64    return nullptr;
65}