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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+  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.
+*/
+
+/**
+ *  \file SDL_hidapi.h
+ *
+ *  Header file for SDL HIDAPI functions.
+ *
+ *  This is an adaptation of the original HIDAPI interface by Alan Ott,
+ *  and includes source code licensed under the following BSD license:
+ *
+    Copyright (c) 2010, Alan Ott, Signal 11 Software
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of Signal 11 Software nor the names of its
+      contributors may be used to endorse or promote products derived from
+      this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+ *
+ * If you would like a version of SDL without this code, you can build SDL
+ * with SDL_HIDAPI_DISABLED defined to 1. You might want to do this for example
+ * on iOS or tvOS to avoid a dependency on the CoreBluetooth framework.
+ */
+
+#ifndef SDL_hidapi_h_
+#define SDL_hidapi_h_
+
+#include "SDL_stdinc.h"
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \brief  A handle representing an open HID device
+ */
+struct SDL_hid_device_;
+typedef struct SDL_hid_device_ SDL_hid_device; /**< opaque hidapi structure */
+
+/** hidapi info structure */
+/**
+ *  \brief  Information about a connected HID device
+ */
+typedef struct SDL_hid_device_info
+{
+    /** Platform-specific device path */
+    char *path;
+    /** Device Vendor ID */
+    unsigned short vendor_id;
+    /** Device Product ID */
+    unsigned short product_id;
+    /** Serial Number */
+    wchar_t *serial_number;
+    /** Device Release Number in binary-coded decimal,
+        also known as Device Version Number */
+    unsigned short release_number;
+    /** Manufacturer String */
+    wchar_t *manufacturer_string;
+    /** Product string */
+    wchar_t *product_string;
+    /** Usage Page for this Device/Interface
+        (Windows/Mac only). */
+    unsigned short usage_page;
+    /** Usage for this Device/Interface
+        (Windows/Mac only).*/
+    unsigned short usage;
+    /** The USB interface which this logical device
+        represents.
+
+        * Valid on both Linux implementations in all cases.
+        * Valid on the Windows implementation only if the device
+          contains more than one interface. */
+    int interface_number;
+
+    /** Additional information about the USB interface.
+        Valid on libusb and Android implementations. */
+    int interface_class;
+    int interface_subclass;
+    int interface_protocol;
+
+    /** Pointer to the next device */
+    struct SDL_hid_device_info *next;
+} SDL_hid_device_info;
+
+
+/**
+ * Initialize the HIDAPI library.
+ *
+ * This function initializes the HIDAPI library. Calling it is not strictly
+ * necessary, as it will be called automatically by SDL_hid_enumerate() and
+ * any of the SDL_hid_open_*() functions if it is needed. This function should
+ * be called at the beginning of execution however, if there is a chance of
+ * HIDAPI handles being opened by different threads simultaneously.
+ *
+ * Each call to this function should have a matching call to SDL_hid_exit()
+ *
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ *
+ * \sa SDL_hid_exit
+ */
+extern DECLSPEC int SDLCALL SDL_hid_init(void);
+
+/**
+ * Finalize the HIDAPI library.
+ *
+ * This function frees all of the static data associated with HIDAPI. It
+ * should be called at the end of execution to avoid memory leaks.
+ *
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ *
+ * \sa SDL_hid_init
+ */
+extern DECLSPEC int SDLCALL SDL_hid_exit(void);
+
+/**
+ * Check to see if devices may have been added or removed.
+ *
+ * Enumerating the HID devices is an expensive operation, so you can call this
+ * to see if there have been any system device changes since the last call to
+ * this function. A change in the counter returned doesn't necessarily mean
+ * that anything has changed, but you can call SDL_hid_enumerate() to get an
+ * updated device list.
+ *
+ * Calling this function for the first time may cause a thread or other system
+ * resource to be allocated to track device change notifications.
+ *
+ * \returns a change counter that is incremented with each potential device
+ *          change, or 0 if device change detection isn't available.
+ *
+ * \since This function is available since SDL 2.0.18.
+ *
+ * \sa SDL_hid_enumerate
+ */
+extern DECLSPEC Uint32 SDLCALL SDL_hid_device_change_count(void);
+
+/**
+ * Enumerate the HID Devices.
+ *
+ * This function returns a linked list of all the HID devices attached to the
+ * system which match vendor_id and product_id. If `vendor_id` is set to 0
+ * then any vendor matches. If `product_id` is set to 0 then any product
+ * matches. If `vendor_id` and `product_id` are both set to 0, then all HID
+ * devices will be returned.
+ *
+ * \param vendor_id The Vendor ID (VID) of the types of device to open.
+ * \param product_id The Product ID (PID) of the types of device to open.
+ * \returns a pointer to a linked list of type SDL_hid_device_info, containing
+ *          information about the HID devices attached to the system, or NULL
+ *          in the case of failure. Free this linked list by calling
+ *          SDL_hid_free_enumeration().
+ *
+ * \since This function is available since SDL 2.0.18.
+ *
+ * \sa SDL_hid_device_change_count
+ */
+extern DECLSPEC SDL_hid_device_info * SDLCALL SDL_hid_enumerate(unsigned short vendor_id, unsigned short product_id);
+
+/**
+ * Free an enumeration Linked List
+ *
+ * This function frees a linked list created by SDL_hid_enumerate().
+ *
+ * \param devs Pointer to a list of struct_device returned from
+ *             SDL_hid_enumerate().
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC void SDLCALL SDL_hid_free_enumeration(SDL_hid_device_info *devs);
+
+/**
+ * Open a HID device using a Vendor ID (VID), Product ID (PID) and optionally
+ * a serial number.
+ *
+ * If `serial_number` is NULL, the first device with the specified VID and PID
+ * is opened.
+ *
+ * \param vendor_id The Vendor ID (VID) of the device to open.
+ * \param product_id The Product ID (PID) of the device to open.
+ * \param serial_number The Serial Number of the device to open (Optionally
+ *                      NULL).
+ * \returns a pointer to a SDL_hid_device object on success or NULL on
+ *          failure.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC SDL_hid_device * SDLCALL SDL_hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number);
+
+/**
+ * Open a HID device by its path name.
+ *
+ * The path name be determined by calling SDL_hid_enumerate(), or a
+ * platform-specific path name can be used (eg: /dev/hidraw0 on Linux).
+ *
+ * \param path The path name of the device to open
+ * \returns a pointer to a SDL_hid_device object on success or NULL on
+ *          failure.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC SDL_hid_device * SDLCALL SDL_hid_open_path(const char *path, int bExclusive /* = false */);
+
+/**
+ * Write an Output report to a HID device.
+ *
+ * The first byte of `data` must contain the Report ID. For devices which only
+ * support a single report, this must be set to 0x0. The remaining bytes
+ * contain the report data. Since the Report ID is mandatory, calls to
+ * SDL_hid_write() will always contain one more byte than the report contains.
+ * For example, if a hid report is 16 bytes long, 17 bytes must be passed to
+ * SDL_hid_write(), the Report ID (or 0x0, for devices with a single report),
+ * followed by the report data (16 bytes). In this example, the length passed
+ * in would be 17.
+ *
+ * SDL_hid_write() will send the data on the first OUT endpoint, if one
+ * exists. If it does not, it will send the data through the Control Endpoint
+ * (Endpoint 0).
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param data The data to send, including the report number as the first
+ *             byte.
+ * \param length The length in bytes of the data to send.
+ * \returns the actual number of bytes written and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_write(SDL_hid_device *dev, const unsigned char *data, size_t length);
+
+/**
+ * Read an Input report from a HID device with timeout.
+ *
+ * Input reports are returned to the host through the INTERRUPT IN endpoint.
+ * The first byte will contain the Report number if the device uses numbered
+ * reports.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param data A buffer to put the read data into.
+ * \param length The number of bytes to read. For devices with multiple
+ *               reports, make sure to read an extra byte for the report
+ *               number.
+ * \param milliseconds timeout in milliseconds or -1 for blocking wait.
+ * \returns the actual number of bytes read and -1 on error. If no packet was
+ *          available to be read within the timeout period, this function
+ *          returns 0.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_read_timeout(SDL_hid_device *dev, unsigned char *data, size_t length, int milliseconds);
+
+/**
+ * Read an Input report from a HID device.
+ *
+ * Input reports are returned to the host through the INTERRUPT IN endpoint.
+ * The first byte will contain the Report number if the device uses numbered
+ * reports.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param data A buffer to put the read data into.
+ * \param length The number of bytes to read. For devices with multiple
+ *               reports, make sure to read an extra byte for the report
+ *               number.
+ * \returns the actual number of bytes read and -1 on error. If no packet was
+ *          available to be read and the handle is in non-blocking mode, this
+ *          function returns 0.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_read(SDL_hid_device *dev, unsigned char *data, size_t length);
+
+/**
+ * Set the device handle to be non-blocking.
+ *
+ * In non-blocking mode calls to SDL_hid_read() will return immediately with a
+ * value of 0 if there is no data to be read. In blocking mode, SDL_hid_read()
+ * will wait (block) until there is data to read before returning.
+ *
+ * Nonblocking can be turned on and off at any time.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param nonblock enable or not the nonblocking reads - 1 to enable
+ *                 nonblocking - 0 to disable nonblocking.
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_set_nonblocking(SDL_hid_device *dev, int nonblock);
+
+/**
+ * Send a Feature report to the device.
+ *
+ * Feature reports are sent over the Control endpoint as a Set_Report
+ * transfer. The first byte of `data` must contain the Report ID. For devices
+ * which only support a single report, this must be set to 0x0. The remaining
+ * bytes contain the report data. Since the Report ID is mandatory, calls to
+ * SDL_hid_send_feature_report() will always contain one more byte than the
+ * report contains. For example, if a hid report is 16 bytes long, 17 bytes
+ * must be passed to SDL_hid_send_feature_report(): the Report ID (or 0x0, for
+ * devices which do not use numbered reports), followed by the report data (16
+ * bytes). In this example, the length passed in would be 17.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param data The data to send, including the report number as the first
+ *             byte.
+ * \param length The length in bytes of the data to send, including the report
+ *               number.
+ * \returns the actual number of bytes written and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_send_feature_report(SDL_hid_device *dev, const unsigned char *data, size_t length);
+
+/**
+ * Get a feature report from a HID device.
+ *
+ * Set the first byte of `data` to the Report ID of the report to be read.
+ * Make sure to allow space for this extra byte in `data`. Upon return, the
+ * first byte will still contain the Report ID, and the report data will start
+ * in data[1].
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param data A buffer to put the read data into, including the Report ID.
+ *             Set the first byte of `data` to the Report ID of the report to
+ *             be read, or set it to zero if your device does not use numbered
+ *             reports.
+ * \param length The number of bytes to read, including an extra byte for the
+ *               report ID. The buffer can be longer than the actual report.
+ * \returns the number of bytes read plus one for the report ID (which is
+ *          still in the first byte), or -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_get_feature_report(SDL_hid_device *dev, unsigned char *data, size_t length);
+
+/**
+ * Close a HID device.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC void SDLCALL SDL_hid_close(SDL_hid_device *dev);
+
+/**
+ * Get The Manufacturer String from a HID device.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param string A wide string buffer to put the data into.
+ * \param maxlen The length of the buffer in multiples of wchar_t.
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_get_manufacturer_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
+
+/**
+ * Get The Product String from a HID device.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param string A wide string buffer to put the data into.
+ * \param maxlen The length of the buffer in multiples of wchar_t.
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_get_product_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
+
+/**
+ * Get The Serial Number String from a HID device.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param string A wide string buffer to put the data into.
+ * \param maxlen The length of the buffer in multiples of wchar_t.
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_get_serial_number_string(SDL_hid_device *dev, wchar_t *string, size_t maxlen);
+
+/**
+ * Get a string from a HID device, based on its string index.
+ *
+ * \param dev A device handle returned from SDL_hid_open().
+ * \param string_index The index of the string to get.
+ * \param string A wide string buffer to put the data into.
+ * \param maxlen The length of the buffer in multiples of wchar_t.
+ * \returns 0 on success and -1 on error.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_hid_get_indexed_string(SDL_hid_device *dev, int string_index, wchar_t *string, size_t maxlen);
+
+/**
+ * Start or stop a BLE scan on iOS and tvOS to pair Steam Controllers
+ *
+ * \param active SDL_TRUE to start the scan, SDL_FALSE to stop the scan
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC void SDLCALL SDL_hid_ble_scan(SDL_bool active);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_hidapi_h_ */
+
+/* vi: set sts=4 ts=4 sw=4 expandtab: */