/*

Simple DirectMedia Layer

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../../SDL_internal.h"

#ifdef SDL_JOYSTICK_HIDAPI

#include "SDL_endian.h"

#include "SDL_hints.h"

#include "SDL_log.h"

#include "SDL_timer.h"

#include "SDL_joystick.h"

#include "../SDL_sysjoystick.h"

#include "SDL_hidapijoystick_c.h"

#if defined(__WIN32__)

#include "../../core/windows/SDL_windows.h"

#endif

#if defined(__MACOSX__)

#include <CoreFoundation/CoreFoundation.h>

#include <mach/mach.h>

#include <IOKit/IOKitLib.h>

#include <IOKit/usb/USBSpec.h>

#endif

#if defined(__LINUX__)

#include "../../core/linux/SDL_udev.h"

#ifdef SDL_USE_LIBUDEV

#include <poll.h>

#endif

#endif

};

static SDL_HIDAPI_DeviceDriver *SDL_HIDAPI_drivers[] = {

#ifdef SDL_JOYSTICK_HIDAPI_PS4

&SDL_HIDAPI_DriverPS4,

#endif

#ifdef SDL_JOYSTICK_HIDAPI_STEAM

&SDL_HIDAPI_DriverSteam,

#endif

#ifdef SDL_JOYSTICK_HIDAPI_SWITCH

&SDL_HIDAPI_DriverSwitch,

#endif

#ifdef SDL_JOYSTICK_HIDAPI_XBOX360

&SDL_HIDAPI_DriverXbox360,

#endif

#ifdef SDL_JOYSTICK_HIDAPI_XBOXONE

&SDL_HIDAPI_DriverXboxOne,

#endif

#ifdef SDL_JOYSTICK_HIDAPI_GAMECUBE

&SDL_HIDAPI_DriverGameCube,

#endif

static SDL_HIDAPI_Device *SDL_HIDAPI_devices;

static int SDL_HIDAPI_numjoysticks = 0;

#if defined(SDL_USE_LIBUDEV)

static const SDL_UDEV_Symbols * usyms = NULL;

#endif

static struct

{

SDL_bool m_bHaveDevicesChanged;

SDL_bool m_bCanGetNotifications;

Uint32 m_unLastDetect;

#if defined(__WIN32__)

WNDCLASSEXA m_wndClass;

HWND m_hwndMsg;

HDEVNOTIFY m_hNotify;

double m_flLastWin32MessageCheck;

#endif

#if defined(__MACOSX__)

IONotificationPortRef m_notificationPort;

mach_port_t m_notificationMach;

#endif

#if defined(SDL_USE_LIBUDEV)

struct udev *m_pUdev;

struct udev_monitor *m_pUdevMonitor;

int m_nUdevFd;

#endif

} SDL_HIDAPI_discovery;

#ifdef __WIN32__

struct _DEV_BROADCAST_HDR

{

DWORD dbch_size;

DWORD dbch_devicetype;

DWORD dbch_reserved;

};

typedef struct _DEV_BROADCAST_DEVICEINTERFACE_A

{

DWORD dbcc_size;

DWORD dbcc_devicetype;

DWORD dbcc_reserved;

GUID dbcc_classguid;

char dbcc_name[ 1 ];

} DEV_BROADCAST_DEVICEINTERFACE_A, *PDEV_BROADCAST_DEVICEINTERFACE_A;

typedef struct _DEV_BROADCAST_HDR DEV_BROADCAST_HDR;

#define DBT_DEVICEARRIVAL 0x8000 /* system detected a new device */

#define DBT_DEVTYP_DEVICEINTERFACE 0x00000005 /* device interface class */

#define DBT_DEVNODES_CHANGED 0x0007

#define DBT_CONFIGCHANGED 0x0018

#define DBT_DEVICETYPESPECIFIC 0x8005 /* type specific event */

#include <initguid.h>

DEFINE_GUID(GUID_DEVINTERFACE_USB_DEVICE, 0xA5DCBF10L, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED);

static LRESULT CALLBACK ControllerWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

switch (message) {

case WM_DEVICECHANGE:

switch (wParam) {

case DBT_DEVICEARRIVAL:

}

break;

}

}

return DefWindowProc(hwnd, message, wParam, lParam);

}

#endif /* __WIN32__ */

#if defined(__MACOSX__)

{

/* Must drain the iterator, or we won't receive new notifications */

io_object_t entry;

while ((entry = IOIteratorNext(portIterator)) != 0) {

IOObjectRelease(entry);

*(SDL_bool*)context = SDL_TRUE;

}

}

#endif /* __MACOSX__ */

static void

HIDAPI_InitializeDiscovery()

{

SDL_HIDAPI_discovery.m_bHaveDevicesChanged = SDL_TRUE;

SDL_HIDAPI_discovery.m_bCanGetNotifications = SDL_FALSE;

SDL_HIDAPI_discovery.m_unLastDetect = 0;

#if defined(__WIN32__)

SDL_HIDAPI_discovery.m_nThreadID = SDL_ThreadID();

SDL_memset(&SDL_HIDAPI_discovery.m_wndClass, 0x0, sizeof(SDL_HIDAPI_discovery.m_wndClass));

SDL_HIDAPI_discovery.m_wndClass.hInstance = GetModuleHandle(NULL);

SDL_HIDAPI_discovery.m_wndClass.lpfnWndProc = ControllerWndProc; /* This function is called by windows */

SDL_HIDAPI_discovery.m_wndClass.cbSize = sizeof(WNDCLASSEX);

RegisterClassExA(&SDL_HIDAPI_discovery.m_wndClass);

{

DEV_BROADCAST_DEVICEINTERFACE_A devBroadcast;

SDL_memset( &devBroadcast, 0x0, sizeof( devBroadcast ) );

devBroadcast.dbcc_size = sizeof( devBroadcast );

devBroadcast.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;

devBroadcast.dbcc_classguid = GUID_DEVINTERFACE_USB_DEVICE;

/* DEVICE_NOTIFY_ALL_INTERFACE_CLASSES is important, makes GUID_DEVINTERFACE_USB_DEVICE ignored,

* but that seems to be necessary to get a notice after each individual usb input device actually

* installs, rather than just as the composite device is seen.

*/

SDL_HIDAPI_discovery.m_hNotify = RegisterDeviceNotification( SDL_HIDAPI_discovery.m_hwndMsg, &devBroadcast, DEVICE_NOTIFY_WINDOW_HANDLE | DEVICE_NOTIFY_ALL_INTERFACE_CLASSES );

SDL_HIDAPI_discovery.m_bCanGetNotifications = ( SDL_HIDAPI_discovery.m_hNotify != 0 );

}

#endif /* __WIN32__ */

#if defined(__MACOSX__)

SDL_HIDAPI_discovery.m_notificationPort = IONotificationPortCreate(kIOMasterPortDefault);

if (SDL_HIDAPI_discovery.m_notificationPort) {

{

CFMutableDictionaryRef matchingDict = IOServiceMatching("IOUSBDevice");

/* Note: IOServiceAddMatchingNotification consumes the reference to matchingDict */

io_iterator_t portIterator = 0;

if (IOServiceAddMatchingNotification(SDL_HIDAPI_discovery.m_notificationPort, kIOMatchedNotification, matchingDict, CallbackIOServiceFunc, &SDL_HIDAPI_discovery.m_bHaveDevicesChanged, &portIterator) == 0) {

/* Must drain the existing iterator, or we won't receive new notifications */

IOObjectRelease(entry);

}

} else {

IONotificationPortDestroy(SDL_HIDAPI_discovery.m_notificationPort);

SDL_HIDAPI_discovery.m_notificationPort = nil;

}

}

{

CFMutableDictionaryRef matchingDict = IOServiceMatching("IOBluetoothDevice");

/* Note: IOServiceAddMatchingNotification consumes the reference to matchingDict */

io_iterator_t portIterator = 0;

if (IOServiceAddMatchingNotification(SDL_HIDAPI_discovery.m_notificationPort, kIOMatchedNotification, matchingDict, CallbackIOServiceFunc, &SDL_HIDAPI_discovery.m_bHaveDevicesChanged, &portIterator) == 0) {

/* Must drain the existing iterator, or we won't receive new notifications */

IOObjectRelease(entry);

}

} else {

IONotificationPortDestroy(SDL_HIDAPI_discovery.m_notificationPort);

SDL_HIDAPI_discovery.m_notificationPort = nil;

}

}

}

SDL_HIDAPI_discovery.m_notificationMach = MACH_PORT_NULL;

if (SDL_HIDAPI_discovery.m_notificationPort) {

SDL_HIDAPI_discovery.m_notificationMach = IONotificationPortGetMachPort(SDL_HIDAPI_discovery.m_notificationPort);

}

SDL_HIDAPI_discovery.m_bCanGetNotifications = (SDL_HIDAPI_discovery.m_notificationMach != MACH_PORT_NULL);

#endif // __MACOSX__

#if defined(SDL_USE_LIBUDEV)

SDL_HIDAPI_discovery.m_pUdev = NULL;

SDL_HIDAPI_discovery.m_pUdevMonitor = NULL;

SDL_HIDAPI_discovery.m_nUdevFd = -1;

usyms = SDL_UDEV_GetUdevSyms();

if (usyms) {

SDL_HIDAPI_discovery.m_pUdev = usyms->udev_new();

}

usyms->udev_monitor_enable_receiving(SDL_HIDAPI_discovery.m_pUdevMonitor);

SDL_HIDAPI_discovery.m_nUdevFd = usyms->udev_monitor_get_fd(SDL_HIDAPI_discovery.m_pUdevMonitor);

}

}

#endif /* SDL_USE_LIBUDEV */

}

static void

HIDAPI_UpdateDiscovery()

{

if (!SDL_HIDAPI_discovery.m_bCanGetNotifications) {

const Uint32 SDL_HIDAPI_DETECT_INTERVAL_MS = 3000; /* Update every 3 seconds */

Uint32 now = SDL_GetTicks();

if (!SDL_HIDAPI_discovery.m_unLastDetect || SDL_TICKS_PASSED(now, SDL_HIDAPI_discovery.m_unLastDetect + SDL_HIDAPI_DETECT_INTERVAL_MS)) {

SDL_HIDAPI_discovery.m_bHaveDevicesChanged = SDL_TRUE;

SDL_HIDAPI_discovery.m_unLastDetect = now;

}

return;

}

#if defined(__WIN32__)

#if 0 /* just let the usual SDL_PumpEvents loop dispatch these, fixing bug 4286. --ryan. */

/* We'll only get messages on the same thread that created the window */

if (SDL_ThreadID() == SDL_HIDAPI_discovery.m_nThreadID) {

MSG msg;

while (PeekMessage(&msg, SDL_HIDAPI_discovery.m_hwndMsg, 0, 0, PM_NOREMOVE)) {

if (GetMessageA(&msg, SDL_HIDAPI_discovery.m_hwndMsg, 0, 0) != 0) {

TranslateMessage(&msg);

DispatchMessage(&msg);

}

}

}

#endif

#if defined(__MACOSX__)

if (SDL_HIDAPI_discovery.m_notificationPort) {

struct { mach_msg_header_t hdr; char payload[ 4096 ]; } msg;

while (mach_msg(&msg.hdr, MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0, sizeof(msg), SDL_HIDAPI_discovery.m_notificationMach, 0, MACH_PORT_NULL) == KERN_SUCCESS) {

IODispatchCalloutFromMessage(NULL, &msg.hdr, SDL_HIDAPI_discovery.m_notificationPort);

}

}

#endif

#if defined(SDL_USE_LIBUDEV)

if (SDL_HIDAPI_discovery.m_nUdevFd >= 0) {

/* Drain all notification events.

* We don't expect a lot of device notifications so just

* do a new discovery on any kind or number of notifications.

* This could be made more restrictive if necessary.

*/

for (;;) {

struct pollfd PollUdev;

PollUdev.fd = SDL_HIDAPI_discovery.m_nUdevFd;

PollUdev.events = POLLIN;

if (poll(&PollUdev, 1, 0) != 1) {

break;

}

}

}

}

#endif

}

static void

HIDAPI_ShutdownDiscovery()

{

#if defined(__WIN32__)

if (SDL_HIDAPI_discovery.m_hNotify)

UnregisterDeviceNotification(SDL_HIDAPI_discovery.m_hNotify);

if (SDL_HIDAPI_discovery.m_hwndMsg) {

DestroyWindow(SDL_HIDAPI_discovery.m_hwndMsg);

}

UnregisterClassA(SDL_HIDAPI_discovery.m_wndClass.lpszClassName, SDL_HIDAPI_discovery.m_wndClass.hInstance);

#endif

#if defined(__MACOSX__)

if (SDL_HIDAPI_discovery.m_notificationPort) {

IONotificationPortDestroy(SDL_HIDAPI_discovery.m_notificationPort);

}

#endif

#if defined(SDL_USE_LIBUDEV)

if (SDL_HIDAPI_discovery.m_pUdevMonitor) {

usyms->udev_monitor_unref(SDL_HIDAPI_discovery.m_pUdevMonitor);

}

if (SDL_HIDAPI_discovery.m_pUdev) {

usyms->udev_unref(SDL_HIDAPI_discovery.m_pUdev);

}

SDL_UDEV_ReleaseUdevSyms();

usyms = NULL;

}

#endif

}

static void HIDAPI_JoystickDetect(void);

static void HIDAPI_JoystickClose(SDL_Joystick * joystick);

{

int i;

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

return SDL_TRUE;

}

}

return SDL_FALSE;

}

static SDL_HIDAPI_DeviceDriver *

HIDAPI_GetDeviceDriver(SDL_HIDAPI_Device *device)

{

const Uint16 USAGE_PAGE_GENERIC_DESKTOP = 0x0001;

const Uint16 USAGE_JOYSTICK = 0x0004;

const Uint16 USAGE_GAMEPAD = 0x0005;

const Uint16 USAGE_MULTIAXISCONTROLLER = 0x0008;

int i;

if (SDL_ShouldIgnoreJoystick(device->name, device->guid)) {

return NULL;

}

if (device->usage_page && device->usage_page != USAGE_PAGE_GENERIC_DESKTOP) {

return NULL;

}

if (device->usage && device->usage != USAGE_JOYSTICK && device->usage != USAGE_GAMEPAD && device->usage != USAGE_MULTIAXISCONTROLLER) {

return NULL;

}

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

return driver;

}

}

return NULL;

}

static SDL_HIDAPI_Device *

{

SDL_HIDAPI_Device *device = SDL_HIDAPI_devices;

while (device) {

if (device->driver) {

if (device_index < device->num_joysticks) {

if (pJoystickID) {

*pJoystickID = device->joysticks[device_index];

}

return device;

}

device = device->next;

}

}

static SDL_HIDAPI_Device *

HIDAPI_GetJoystickByInfo(const char *path, Uint16 vendor_id, Uint16 product_id)

{

SDL_HIDAPI_Device *device = SDL_HIDAPI_devices;

while (device) {

if (device->vendor_id == vendor_id && device->product_id == product_id &&

SDL_strcmp(device->path, path) == 0) {

break;

}

device = device->next;

}

return device;

}

static void

HIDAPI_SetupDeviceDriver(SDL_HIDAPI_Device *device)

{

if (device->driver) {

/* Already setup */

return;

}

device->driver = HIDAPI_GetDeviceDriver(device);

if (device->driver) {

const char *name = device->driver->GetDeviceName(device->vendor_id, device->product_id);

if (name) {

SDL_free(device->name);

device->name = SDL_strdup(name);

}

}

/* Initialize the device, which may cause a connected event */

if (device->driver && !device->driver->InitDevice(device)) {

device->driver = NULL;

}

}

static void

HIDAPI_CleanupDeviceDriver(SDL_HIDAPI_Device *device)

{

int i;

if (!device->driver) {

/* Already cleaned up */

return;

}

/* Disconnect any joysticks */

for (i = 0; i < device->num_joysticks; ++i) {

SDL_Joystick *joystick = SDL_JoystickFromInstanceID(device->joysticks[i]);

if (joystick) {

HIDAPI_JoystickClose(joystick);

}

HIDAPI_JoystickDisconnected(device, device->joysticks[i]);

}

device->driver->FreeDevice(device);

device->driver = NULL;

}

static void SDLCALL

SDL_HIDAPIDriverHintChanged(void *userdata, const char *name, const char *oldValue, const char *hint)

{

int i;

SDL_HIDAPI_Device *device = SDL_HIDAPI_devices;

if (SDL_strcmp(name, SDL_HINT_JOYSTICK_HIDAPI) == 0) {

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

driver->enabled = SDL_GetHintBoolean(driver->hint, enabled);

}

} else {

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

if (SDL_strcmp(name, driver->hint) == 0) {

driver->enabled = enabled;

break;

}

}

}

SDL_HIDAPI_numdrivers = 0;

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

if (driver->enabled) {

++SDL_HIDAPI_numdrivers;

}

}

while (device) {

if (device->driver && !device->driver->enabled) {

HIDAPI_CleanupDeviceDriver(device);

device = device->next;

}

SDL_UnlockMutex(SDL_HIDAPI_mutex);

}

static int

HIDAPI_JoystickInit(void)

{

int i;

if (initialized) {

return 0;

}

if (hid_init() < 0) {

SDL_SetError("Couldn't initialize hidapi");

return -1;

}

SDL_HIDAPI_mutex = SDL_CreateMutex();

for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {

SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];

SDL_AddHintCallback(driver->hint, SDL_HIDAPIDriverHintChanged, NULL);

}

SDL_AddHintCallback(SDL_HINT_JOYSTICK_HIDAPI,

SDL_HIDAPIDriverHintChanged, NULL);

initialized = SDL_TRUE;

return 0;

}

SDL_bool

HIDAPI_JoystickConnected(SDL_HIDAPI_Device *device, SDL_JoystickID *pJoystickID)

{

SDL_JoystickID joystickID;

SDL_JoystickID *joysticks = (SDL_JoystickID *)SDL_realloc(device->joysticks, (device->num_joysticks + 1)*sizeof(*device->joysticks));

if (!joysticks) {

return SDL_FALSE;

}

joystickID = SDL_GetNextJoystickInstanceID();

device->joysticks = joysticks;

device->joysticks[device->num_joysticks++] = joystickID;

++SDL_HIDAPI_numjoysticks;

SDL_PrivateJoystickAdded(joystickID);

if (pJoystickID) {

*pJoystickID = joystickID;

}

return SDL_TRUE;

}

void

HIDAPI_JoystickDisconnected(SDL_HIDAPI_Device *device, SDL_JoystickID joystickID)

{

int i;

for (i = 0; i < device->num_joysticks; ++i) {

if (device->joysticks[i] == joystickID) {

SDL_memcpy(&device->joysticks[i], &device->joysticks[i+1], device->num_joysticks - i - 1);

--device->num_joysticks;

--SDL_HIDAPI_numjoysticks;

if (!shutting_down) {

SDL_PrivateJoystickRemoved(joystickID);

}

return;

}

}

}

static int

HIDAPI_JoystickGetCount(void)

{

return SDL_HIDAPI_numjoysticks;

}

static void

HIDAPI_AddDevice(struct hid_device_info *info)

{

SDL_HIDAPI_Device *device;

SDL_HIDAPI_Device *curr, *last = NULL;

for (curr = SDL_HIDAPI_devices, last = NULL; curr; last = curr, curr = curr->next) {

continue;

}

device = (SDL_HIDAPI_Device *)SDL_calloc(1, sizeof(*device));

if (!device) {

return;

}

device->path = SDL_strdup(info->path);

if (!device->path) {

SDL_free(device);

return;

}

device->seen = SDL_TRUE;

device->vendor_id = info->vendor_id;

device->product_id = info->product_id;

device->interface_number = info->interface_number;

device->usage_page = info->usage_page;

device->usage = info->usage;

{

/* FIXME: Is there any way to tell whether this is a Bluetooth device? */

const Uint16 vendor = device->vendor_id;

const Uint16 product = device->product_id;

Uint16 *guid16 = (Uint16 *)device->guid.data;

*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_USB);

*guid16++ = 0;

*guid16++ = SDL_SwapLE16(vendor);

*guid16++ = 0;

*guid16++ = SDL_SwapLE16(product);

*guid16++ = 0;

*guid16++ = SDL_SwapLE16(version);

*guid16++ = 0;

/* Note that this is a HIDAPI device for special handling elsewhere */

device->guid.data[14] = 'h';

device->guid.data[15] = 0;

}

if (!device->name) {

const char *name = SDL_GetCustomJoystickName(device->vendor_id, device->product_id);

if (name) {

device->name = SDL_strdup(name);

}

}

char *manufacturer_string = SDL_iconv_string("UTF-8", "WCHAR_T", (char*)info->manufacturer_string, (SDL_wcslen(info->manufacturer_string)+1)*sizeof(wchar_t));

char *product_string = SDL_iconv_string("UTF-8", "WCHAR_T", (char*)info->product_string, (SDL_wcslen(info->product_string)+1)*sizeof(wchar_t));

if (!manufacturer_string && !product_string) {

if (sizeof(wchar_t) == sizeof(Uint16)) {

manufacturer_string = SDL_iconv_string("UTF-8", "UCS-2-INTERNAL", (char*)info->manufacturer_string, (SDL_wcslen(info->manufacturer_string)+1)*sizeof(wchar_t));

product_string = SDL_iconv_string("UTF-8", "UCS-2-INTERNAL", (char*)info->product_string, (SDL_wcslen(info->product_string)+1)*sizeof(wchar_t));

} else if (sizeof(wchar_t) == sizeof(Uint32)) {

manufacturer_string = SDL_iconv_string("UTF-8", "UCS-4-INTERNAL", (char*)info->manufacturer_string, (SDL_wcslen(info->manufacturer_string)+1)*sizeof(wchar_t));

product_string = SDL_iconv_string("UTF-8", "UCS-4-INTERNAL", (char*)info->product_string, (SDL_wcslen(info->product_string)+1)*sizeof(wchar_t));

}

}

manufacturer_remapped = SDL_GetCustomJoystickManufacturer(manufacturer_string);

if (manufacturer_remapped != manufacturer_string) {

SDL_free(manufacturer_string);

manufacturer_string = SDL_strdup(manufacturer_remapped);

}

if (manufacturer_string && product_string) {

size_t name_size = (SDL_strlen(manufacturer_string) + 1 + SDL_strlen(product_string) + 1);

device->name = (char *)SDL_malloc(name_size);

if (device->name) {

if (SDL_strncasecmp(manufacturer_string, product_string, SDL_strlen(manufacturer_string)) == 0) {

SDL_strlcpy(device->name, product_string, name_size);

} else {

SDL_snprintf(device->name, name_size, "%s %s", manufacturer_string, product_string);

}

}

}

if (manufacturer_string) {

SDL_free(manufacturer_string);

}

if (product_string) {

SDL_free(product_string);

}

}

if (!device->name) {

size_t name_size = (6 + 1 + 6 + 1);

device->name = (char *)SDL_malloc(name_size);

if (!device->name) {

SDL_free(device);

return;

}

SDL_snprintf(device->name, name_size, "0x%.4x/0x%.4x", info->vendor_id, info->product_id);

}

/* Add it to the list */

if (last) {

last->next = device;

} else {

SDL_HIDAPI_devices = device;

}

#ifdef DEBUG_HIDAPI

SDL_Log("Added HIDAPI device '%s' VID 0x%.4x, PID 0x%.4x, version %d, interface %d, usage page 0x%.4x, usage 0x%.4x, driver = %s\n", device->name, device->vendor_id, device->product_id, device->version, device->interface_number, device->usage_page, device->usage, device->driver ? device->driver->hint : "NONE");

#endif

}

static void

{

SDL_HIDAPI_Device *curr, *last;

for (curr = SDL_HIDAPI_devices, last = NULL; curr; last = curr, curr = curr->next) {

if (curr == device) {

if (last) {

last->next = curr->next;

} else {

SDL_HIDAPI_devices = curr->next;

}

SDL_free(device->name);

SDL_free(device->path);

SDL_free(device);

return;

}

}

}

static void

HIDAPI_UpdateDeviceList(void)

{

SDL_HIDAPI_Device *device;

struct hid_device_info *devs, *info;

SDL_LockMutex(SDL_HIDAPI_mutex);

/* Prepare the existing device list */

device = SDL_HIDAPI_devices;

while (device) {

device->seen = SDL_FALSE;

device = device->next;

}

/* Enumerate the devices */

if (SDL_HIDAPI_numdrivers > 0) {

devs = hid_enumerate(0, 0);

if (devs) {

for (info = devs; info; info = info->next) {

device = HIDAPI_GetJoystickByInfo(info->path, info->vendor_id, info->product_id);

if (device) {

device->seen = SDL_TRUE;

} else {

HIDAPI_AddDevice(info);

}

}

}

/* Remove any devices that weren't seen */

device = SDL_HIDAPI_devices;

while (device) {

SDL_HIDAPI_Device *next = device->next;

if (!device->seen) {

}

device = next;

}

SDL_UnlockMutex(SDL_HIDAPI_mutex);

}

SDL_bool

{

SDL_HIDAPI_Device *device;

/* Make sure we're initialized, as this could be called from other drivers during startup */

if (HIDAPI_JoystickInit() < 0) {

return SDL_FALSE;

}

return SDL_FALSE;

}

/* Make sure the device list is completely up to date when we check for device presence */

HIDAPI_UpdateDeviceList();

/* Note that this isn't a perfect check - there may be multiple devices with 0 VID/PID,

or a different name than we have it listed here, etc, but if we support the device

and we have something similar in our device list, mark it as present.

*/

device = SDL_HIDAPI_devices;

while (device) {

if (device->vendor_id == vendor_id && device->product_id == product_id && device->driver) {

return SDL_TRUE;

}

device = device->next;

}

return SDL_FALSE;

}

static void

HIDAPI_JoystickDetect(void)

{

HIDAPI_UpdateDiscovery();

if (SDL_HIDAPI_discovery.m_bHaveDevicesChanged) {

/* FIXME: We probably need to schedule an update in a few seconds as well */

}

void

HIDAPI_UpdateDevices(void)

{

SDL_HIDAPI_Device *device;

/* Update the devices, which may change connected joysticks and send events */

SDL_LockMutex(SDL_HIDAPI_mutex);

/* Prepare the existing device list */

device = SDL_HIDAPI_devices;

while (device) {

if (device->driver) {

device->driver->UpdateDevice(device);

}

device = device->next;

}

SDL_UnlockMutex(SDL_HIDAPI_mutex);

}

static const char *

HIDAPI_JoystickGetDeviceName(int device_index)

{

SDL_HIDAPI_Device *device;

const char *name = NULL;

SDL_LockMutex(SDL_HIDAPI_mutex);

device = HIDAPI_GetDeviceByIndex(device_index, NULL);

if (device) {

/* FIXME: The device could be freed after this name is returned... */