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452 lines
17 KiB
C
452 lines
17 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_hidapi.h
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*
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* Header file for SDL HIDAPI functions.
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*
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* This is an adaptation of the original HIDAPI interface by Alan Ott,
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* and includes source code licensed under the following BSD license:
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*
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Copyright (c) 2010, Alan Ott, Signal 11 Software
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Signal 11 Software nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*
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* If you would like a version of SDL without this code, you can build SDL
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* with SDL_HIDAPI_DISABLED defined to 1. You might want to do this for example
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* on iOS or tvOS to avoid a dependency on the CoreBluetooth framework.
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*/
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#ifndef SDL_hidapi_h_
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#define SDL_hidapi_h_
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#include "SDL_stdinc.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief A handle representing an open HID device
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*/
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struct SDL_hid_device_;
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typedef struct SDL_hid_device_ SDL_hid_device; /**< opaque hidapi structure */
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/** hidapi info structure */
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/**
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* \brief Information about a connected HID device
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*/
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typedef struct SDL_hid_device_info
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{
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/** Platform-specific device path */
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char *path;
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/** Device Vendor ID */
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unsigned short vendor_id;
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/** Device Product ID */
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unsigned short product_id;
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/** Serial Number */
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wchar_t *serial_number;
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/** Device Release Number in binary-coded decimal,
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also known as Device Version Number */
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unsigned short release_number;
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/** Manufacturer String */
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wchar_t *manufacturer_string;
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/** Product string */
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wchar_t *product_string;
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/** Usage Page for this Device/Interface
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(Windows/Mac only). */
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unsigned short usage_page;
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/** Usage for this Device/Interface
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(Windows/Mac only).*/
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unsigned short usage;
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/** The USB interface which this logical device
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represents.
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* Valid on both Linux implementations in all cases.
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* Valid on the Windows implementation only if the device
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contains more than one interface. */
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int interface_number;
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/** Additional information about the USB interface.
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Valid on libusb and Android implementations. */
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int interface_class;
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int interface_subclass;
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int interface_protocol;
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/** Pointer to the next device */
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struct SDL_hid_device_info *next;
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} SDL_hid_device_info;
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/**
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* Initialize the HIDAPI library.
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*
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* This function initializes the HIDAPI library. Calling it is not strictly
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* necessary, as it will be called automatically by SDL_hid_enumerate() and
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* any of the SDL_hid_open_*() functions if it is needed. This function should
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* be called at the beginning of execution however, if there is a chance of
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* HIDAPI handles being opened by different threads simultaneously.
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*
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* Each call to this function should have a matching call to SDL_hid_exit()
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*
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*
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* \sa SDL_hid_exit
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*/
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extern DECLSPEC int SDLCALL SDL_hid_init(void);
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/**
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* Finalize the HIDAPI library.
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*
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* This function frees all of the static data associated with HIDAPI. It
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* should be called at the end of execution to avoid memory leaks.
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*
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*
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* \sa SDL_hid_init
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*/
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extern DECLSPEC int SDLCALL SDL_hid_exit(void);
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/**
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* Check to see if devices may have been added or removed.
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*
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* Enumerating the HID devices is an expensive operation, so you can call this
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* to see if there have been any system device changes since the last call to
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* this function. A change in the counter returned doesn't necessarily mean
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* that anything has changed, but you can call SDL_hid_enumerate() to get an
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* updated device list.
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*
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* Calling this function for the first time may cause a thread or other system
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* resource to be allocated to track device change notifications.
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*
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* \returns a change counter that is incremented with each potential device
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* change, or 0 if device change detection isn't available.
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*
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* \since This function is available since SDL 2.0.18.
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*
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* \sa SDL_hid_enumerate
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*/
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extern DECLSPEC Uint32 SDLCALL SDL_hid_device_change_count(void);
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/**
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* Enumerate the HID Devices.
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*
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* This function returns a linked list of all the HID devices attached to the
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* system which match vendor_id and product_id. If `vendor_id` is set to 0
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* then any vendor matches. If `product_id` is set to 0 then any product
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* matches. If `vendor_id` and `product_id` are both set to 0, then all HID
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* devices will be returned.
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*
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* \param vendor_id The Vendor ID (VID) of the types of device to open.
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* \param product_id The Product ID (PID) of the types of device to open.
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* \returns a pointer to a linked list of type SDL_hid_device_info, containing
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* information about the HID devices attached to the system, or NULL
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* in the case of failure. Free this linked list by calling
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* SDL_hid_free_enumeration().
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*
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* \since This function is available since SDL 2.0.18.
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*
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* \sa SDL_hid_device_change_count
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*/
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extern DECLSPEC SDL_hid_device_info * SDLCALL SDL_hid_enumerate(unsigned short vendor_id, unsigned short product_id);
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/**
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* Free an enumeration Linked List
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*
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* This function frees a linked list created by SDL_hid_enumerate().
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*
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* \param devs Pointer to a list of struct_device returned from
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* SDL_hid_enumerate().
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC void SDLCALL SDL_hid_free_enumeration(SDL_hid_device_info *devs);
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/**
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* Open a HID device using a Vendor ID (VID), Product ID (PID) and optionally
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* a serial number.
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*
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* If `serial_number` is NULL, the first device with the specified VID and PID
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* is opened.
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*
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* \param vendor_id The Vendor ID (VID) of the device to open.
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* \param product_id The Product ID (PID) of the device to open.
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* \param serial_number The Serial Number of the device to open (Optionally
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* NULL).
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* \returns a pointer to a SDL_hid_device object on success or NULL on
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* failure.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC SDL_hid_device * SDLCALL SDL_hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number);
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/**
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* Open a HID device by its path name.
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*
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* The path name be determined by calling SDL_hid_enumerate(), or a
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* platform-specific path name can be used (eg: /dev/hidraw0 on Linux).
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*
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* \param path The path name of the device to open
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* \returns a pointer to a SDL_hid_device object on success or NULL on
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* failure.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC SDL_hid_device * SDLCALL SDL_hid_open_path(const char *path, int bExclusive /* = false */);
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/**
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* Write an Output report to a HID device.
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*
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* The first byte of `data` must contain the Report ID. For devices which only
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* support a single report, this must be set to 0x0. The remaining bytes
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* contain the report data. Since the Report ID is mandatory, calls to
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* SDL_hid_write() will always contain one more byte than the report contains.
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* For example, if a hid report is 16 bytes long, 17 bytes must be passed to
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* SDL_hid_write(), the Report ID (or 0x0, for devices with a single report),
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* followed by the report data (16 bytes). In this example, the length passed
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* in would be 17.
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*
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* SDL_hid_write() will send the data on the first OUT endpoint, if one
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* exists. If it does not, it will send the data through the Control Endpoint
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* (Endpoint 0).
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param data The data to send, including the report number as the first
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* byte.
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* \param length The length in bytes of the data to send.
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* \returns the actual number of bytes written and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_write(SDL_hid_device *dev, const unsigned char *data, size_t length);
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/**
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* Read an Input report from a HID device with timeout.
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*
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* Input reports are returned to the host through the INTERRUPT IN endpoint.
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* The first byte will contain the Report number if the device uses numbered
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* reports.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param data A buffer to put the read data into.
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* \param length The number of bytes to read. For devices with multiple
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* reports, make sure to read an extra byte for the report
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* number.
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* \param milliseconds timeout in milliseconds or -1 for blocking wait.
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* \returns the actual number of bytes read and -1 on error. If no packet was
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* available to be read within the timeout period, this function
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* returns 0.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_read_timeout(SDL_hid_device *dev, unsigned char *data, size_t length, int milliseconds);
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/**
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* Read an Input report from a HID device.
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*
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* Input reports are returned to the host through the INTERRUPT IN endpoint.
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* The first byte will contain the Report number if the device uses numbered
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* reports.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param data A buffer to put the read data into.
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* \param length The number of bytes to read. For devices with multiple
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* reports, make sure to read an extra byte for the report
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* number.
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* \returns the actual number of bytes read and -1 on error. If no packet was
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* available to be read and the handle is in non-blocking mode, this
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* function returns 0.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_read(SDL_hid_device *dev, unsigned char *data, size_t length);
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/**
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* Set the device handle to be non-blocking.
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*
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* In non-blocking mode calls to SDL_hid_read() will return immediately with a
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* value of 0 if there is no data to be read. In blocking mode, SDL_hid_read()
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* will wait (block) until there is data to read before returning.
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*
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* Nonblocking can be turned on and off at any time.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param nonblock enable or not the nonblocking reads - 1 to enable
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* nonblocking - 0 to disable nonblocking.
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_set_nonblocking(SDL_hid_device *dev, int nonblock);
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/**
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* Send a Feature report to the device.
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*
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* Feature reports are sent over the Control endpoint as a Set_Report
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* transfer. The first byte of `data` must contain the Report ID. For devices
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* which only support a single report, this must be set to 0x0. The remaining
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* bytes contain the report data. Since the Report ID is mandatory, calls to
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* SDL_hid_send_feature_report() will always contain one more byte than the
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* report contains. For example, if a hid report is 16 bytes long, 17 bytes
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* must be passed to SDL_hid_send_feature_report(): the Report ID (or 0x0, for
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* devices which do not use numbered reports), followed by the report data (16
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* bytes). In this example, the length passed in would be 17.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param data The data to send, including the report number as the first
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* byte.
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* \param length The length in bytes of the data to send, including the report
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* number.
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* \returns the actual number of bytes written and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_send_feature_report(SDL_hid_device *dev, const unsigned char *data, size_t length);
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/**
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* Get a feature report from a HID device.
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*
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* Set the first byte of `data` to the Report ID of the report to be read.
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* Make sure to allow space for this extra byte in `data`. Upon return, the
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* first byte will still contain the Report ID, and the report data will start
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* in data[1].
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param data A buffer to put the read data into, including the Report ID.
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* Set the first byte of `data` to the Report ID of the report to
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* be read, or set it to zero if your device does not use numbered
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* reports.
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* \param length The number of bytes to read, including an extra byte for the
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* report ID. The buffer can be longer than the actual report.
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* \returns the number of bytes read plus one for the report ID (which is
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* still in the first byte), or -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_get_feature_report(SDL_hid_device *dev, unsigned char *data, size_t length);
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/**
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* Close a HID device.
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*
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* \param dev A device handle returned from SDL_hid_open().
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC void SDLCALL SDL_hid_close(SDL_hid_device *dev);
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/**
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* Get The Manufacturer String from a HID device.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param string A wide string buffer to put the data into.
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* \param maxlen The length of the buffer in multiples of wchar_t.
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_get_manufacturer_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
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/**
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* Get The Product String from a HID device.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param string A wide string buffer to put the data into.
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* \param maxlen The length of the buffer in multiples of wchar_t.
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_get_product_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
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/**
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* Get The Serial Number String from a HID device.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param string A wide string buffer to put the data into.
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* \param maxlen The length of the buffer in multiples of wchar_t.
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_get_serial_number_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
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/**
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* Get a string from a HID device, based on its string index.
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*
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* \param dev A device handle returned from SDL_hid_open().
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* \param string_index The index of the string to get.
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* \param string A wide string buffer to put the data into.
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* \param maxlen The length of the buffer in multiples of wchar_t.
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* \returns 0 on success and -1 on error.
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC int SDLCALL SDL_hid_get_indexed_string(SDL_hid_device *dev, int string_index, wchar_t *string, size_t maxlen);
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/**
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* Start or stop a BLE scan on iOS and tvOS to pair Steam Controllers
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*
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* \param active SDL_TRUE to start the scan, SDL_FALSE to stop the scan
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*
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* \since This function is available since SDL 2.0.18.
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*/
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extern DECLSPEC void SDLCALL SDL_hid_ble_scan(SDL_bool active);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_hidapi_h_ */
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/* vi: set sts=4 ts=4 sw=4 expandtab: */
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