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authorDavid Seifert <soap@gentoo.org>2018-03-11 11:31:57 +0100
committerSzczepan Zalega <szczepan@nitrokey.com>2018-03-13 09:37:35 +0100
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tree527ebfbade550a70c3794308e7e93b8085624d5c /include/hidapi/hidapi.h
parent350fa7670ff63d0833d80edee42c1a798c3064c3 (diff)
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-/*******************************************************
- HIDAPI - Multi-Platform library for
- communication with HID devices.
-
- Alan Ott
- Signal 11 Software
-
- 8/22/2009
-
- Copyright 2009, All Rights Reserved.
-
- At the discretion of the user of this library,
- this software may be licensed under the terms of the
- GNU General Public License v3, a BSD-Style license, or the
- original HIDAPI license as outlined in the LICENSE.txt,
- LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
- files located at the root of the source distribution.
- These files may also be found in the public source
- code repository located at:
- http://github.com/signal11/hidapi .
-********************************************************/
-
-/** @file
- * @defgroup API hidapi API
- */
-
-#ifndef HIDAPI_H__
-#define HIDAPI_H__
-
-#include <wchar.h>
-
-#ifdef _WIN32
- #define HID_API_EXPORT __declspec(dllexport)
- #define HID_API_CALL
-#else
- #define HID_API_EXPORT /**< API export macro */
- #define HID_API_CALL /**< API call macro */
-#endif
-
-#define HID_API_EXPORT_CALL HID_API_EXPORT HID_API_CALL /**< API export and call macro*/
-
-#ifdef __cplusplus
-extern "C" {
-#endif
- struct hid_device_;
- typedef struct hid_device_ hid_device; /**< opaque hidapi structure */
-
- /** hidapi info structure */
- struct 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, and valid on the Windows implementation
- only if the device contains more than one interface. */
- int interface_number;
-
- /** Pointer to the next device */
- struct hid_device_info *next;
- };
-
-
- /** @brief Initialize the HIDAPI library.
-
- This function initializes the HIDAPI library. Calling it is not
- strictly necessary, as it will be called automatically by
- hid_enumerate() and any of the 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.
-
- @ingroup API
-
- @returns
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_init(void);
-
- /** @brief 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.
-
- @ingroup API
-
- @returns
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_exit(void);
-
- /** @brief 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 @p vendor_id is set to 0 then any vendor matches.
- If @p product_id is set to 0 then any product matches.
- If @p vendor_id and @p product_id are both set to 0, then
- all HID devices will be returned.
-
- @ingroup API
- @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
- This function returns a pointer to a linked list of type
- struct #hid_device, containing information about the HID devices
- attached to the system, or NULL in the case of failure. Free
- this linked list by calling hid_free_enumeration().
- */
- struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id);
-
- /** @brief Free an enumeration Linked List
-
- This function frees a linked list created by hid_enumerate().
-
- @ingroup API
- @param devs Pointer to a list of struct_device returned from
- hid_enumerate().
- */
- void HID_API_EXPORT HID_API_CALL hid_free_enumeration(struct hid_device_info *devs);
-
- /** @brief Open a HID device using a Vendor ID (VID), Product ID
- (PID) and optionally a serial number.
-
- If @p serial_number is NULL, the first device with the
- specified VID and PID is opened.
-
- @ingroup API
- @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
- This function returns a pointer to a #hid_device object on
- success or NULL on failure.
- */
- HID_API_EXPORT hid_device * HID_API_CALL hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number);
-
- /** @brief Open a HID device by its path name.
-
- The path name be determined by calling hid_enumerate(), or a
- platform-specific path name can be used (eg: /dev/hidraw0 on
- Linux).
-
- @ingroup API
- @param path The path name of the device to open
-
- @returns
- This function returns a pointer to a #hid_device object on
- success or NULL on failure.
- */
- HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path);
-
- /** @brief Write an Output report to a HID device.
-
- The first byte of @p 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 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
- 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.
-
- 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).
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns the actual number of bytes written and
- -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_write(hid_device *device, const unsigned char *data, size_t length);
-
- /** @brief 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.
-
- @ingroup API
- @param device A device handle returned from 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
- This function 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.
- */
- int HID_API_EXPORT HID_API_CALL hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds);
-
- /** @brief 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.
-
- @ingroup API
- @param device A device handle returned from 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
- This function 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.
- */
- int HID_API_EXPORT HID_API_CALL hid_read(hid_device *device, unsigned char *data, size_t length);
-
- /** @brief Set the device handle to be non-blocking.
-
- In non-blocking mode calls to hid_read() will return
- immediately with a value of 0 if there is no data to be
- read. In blocking mode, hid_read() will wait (block) until
- there is data to read before returning.
-
- Nonblocking can be turned on and off at any time.
-
- @ingroup API
- @param device A device handle returned from hid_open().
- @param nonblock enable or not the nonblocking reads
- - 1 to enable nonblocking
- - 0 to disable nonblocking.
-
- @returns
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_set_nonblocking(hid_device *device, int nonblock);
-
- /** @brief Send a Feature report to the device.
-
- Feature reports are sent over the Control endpoint as a
- Set_Report transfer. The first byte of @p 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 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
- 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.
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns the actual number of bytes written and
- -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_send_feature_report(hid_device *device, const unsigned char *data, size_t length);
-
- /** @brief Get a feature report from a HID device.
-
- Set the first byte of @p data[] to the Report ID of the
- report to be read. Make sure to allow space for this
- extra byte in @p data[]. Upon return, the first byte will
- still contain the Report ID, and the report data will
- start in data[1].
-
- @ingroup API
- @param device A device handle returned from hid_open().
- @param data A buffer to put the read data into, including
- the Report ID. Set the first byte of @p 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
- This function returns the number of bytes read plus
- one for the report ID (which is still in the first
- byte), or -1 on error.
- */
- int HID_API_EXPORT HID_API_CALL hid_get_feature_report(hid_device *device, unsigned char *data, size_t length);
-
- /** @brief Close a HID device.
-
- @ingroup API
- @param device A device handle returned from hid_open().
- */
- void HID_API_EXPORT HID_API_CALL hid_close(hid_device *device);
-
- /** @brief Get The Manufacturer String from a HID device.
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT_CALL hid_get_manufacturer_string(hid_device *device, wchar_t *string, size_t maxlen);
-
- /** @brief Get The Product String from a HID device.
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT_CALL hid_get_product_string(hid_device *device, wchar_t *string, size_t maxlen);
-
- /** @brief Get The Serial Number String from a HID device.
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT_CALL hid_get_serial_number_string(hid_device *device, wchar_t *string, size_t maxlen);
-
- /** @brief Get a string from a HID device, based on its string index.
-
- @ingroup API
- @param device A device handle returned from 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
- This function returns 0 on success and -1 on error.
- */
- int HID_API_EXPORT_CALL hid_get_indexed_string(hid_device *device, int string_index, wchar_t *string, size_t maxlen);
-
- /** @brief Get a string describing the last error which occurred.
-
- @ingroup API
- @param device A device handle returned from hid_open().
-
- @returns
- This function returns a string containing the last error
- which occurred or NULL if none has occurred.
- */
- HID_API_EXPORT const wchar_t* HID_API_CALL hid_error(hid_device *device);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-