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388 lines
13 KiB
C
388 lines
13 KiB
C
/*******************************************************
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HIDAPI - Multi-Platform library for
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communication with HID devices.
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Alan Ott
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Signal 11 Software
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8/22/2009
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Copyright 2009, All Rights Reserved.
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At the discretion of the user of this library,
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this software may be licensed under the terms of the
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GNU General Public License v3, a BSD-Style license, or the
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original HIDAPI license as outlined in the LICENSE.txt,
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LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
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files located at the root of the source distribution.
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These files may also be found in the public source
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code repository located at:
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http://github.com/signal11/hidapi .
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********************************************************/
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/** @file
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* @defgroup API hidapi API
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*/
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#ifndef HIDAPI_H__
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#define HIDAPI_H__
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#include <wchar.h>
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#ifdef _WIN32
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#define HID_API_EXPORT __declspec(dllexport)
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#define HID_API_CALL
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#else
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#define HID_API_EXPORT /**< API export macro */
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#define HID_API_CALL /**< API call macro */
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#endif
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#define HID_API_EXPORT_CALL HID_API_EXPORT HID_API_CALL /**< API export and call macro*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct hid_device_;
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typedef struct hid_device_ hid_device; /**< opaque hidapi structure */
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/** hidapi info structure */
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struct hid_device_info {
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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. Valid on both Linux implementations
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in all cases, and valid on the Windows implementation
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only if the device contains more than one interface. */
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int interface_number;
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/** Pointer to the next device */
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struct hid_device_info *next;
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};
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/** @brief Initialize the HIDAPI library.
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This function initializes the HIDAPI library. Calling it is not
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strictly necessary, as it will be called automatically by
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hid_enumerate() and any of the hid_open_*() functions if it is
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needed. This function should be called at the beginning of
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execution however, if there is a chance of HIDAPI handles
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being opened by different threads simultaneously.
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@ingroup API
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@returns
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_init(void);
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/** @brief Finalize the HIDAPI library.
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This function frees all of the static data associated with
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HIDAPI. It should be called at the end of execution to avoid
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memory leaks.
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@ingroup API
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@returns
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_exit(void);
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/** @brief Enumerate the HID Devices.
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This function returns a linked list of all the HID devices
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attached to the system which match vendor_id and product_id.
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If @p vendor_id is set to 0 then any vendor matches.
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If @p product_id is set to 0 then any product matches.
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If @p vendor_id and @p product_id are both set to 0, then
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all HID devices will be returned.
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@ingroup API
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@param vendor_id The Vendor ID (VID) of the types of device
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to open.
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@param product_id The Product ID (PID) of the types of
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device to open.
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@returns
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This function returns a pointer to a linked list of type
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struct #hid_device, containing information about the HID devices
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attached to the system, or NULL in the case of failure. Free
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this linked list by calling hid_free_enumeration().
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*/
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struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id);
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/** @brief Free an enumeration Linked List
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This function frees a linked list created by hid_enumerate().
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@ingroup API
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@param devs Pointer to a list of struct_device returned from
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hid_enumerate().
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*/
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void HID_API_EXPORT HID_API_CALL hid_free_enumeration(struct hid_device_info *devs);
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/** @brief Open a HID device using a Vendor ID (VID), Product ID
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(PID) and optionally a serial number.
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If @p serial_number is NULL, the first device with the
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specified VID and PID is opened.
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@ingroup API
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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
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(Optionally NULL).
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@returns
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This function returns a pointer to a #hid_device object on
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success or NULL on failure.
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*/
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HID_API_EXPORT hid_device * HID_API_CALL hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number);
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/** @brief Open a HID device by its path name.
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The path name be determined by calling hid_enumerate(), or a
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platform-specific path name can be used (eg: /dev/hidraw0 on
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Linux).
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@ingroup API
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@param path The path name of the device to open
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@returns
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This function returns a pointer to a #hid_device object on
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success or NULL on failure.
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*/
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HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path);
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/** @brief Write an Output report to a HID device.
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The first byte of @p data[] must contain the Report ID. For
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devices which only support a single report, this must be set
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to 0x0. The remaining bytes contain the report data. Since
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the Report ID is mandatory, calls to hid_write() will always
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contain one more byte than the report contains. For example,
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if a hid report is 16 bytes long, 17 bytes must be passed to
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hid_write(), the Report ID (or 0x0, for devices with a
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single report), followed by the report data (16 bytes). In
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this example, the length passed in would be 17.
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hid_write() will send the data on the first OUT endpoint, if
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one exists. If it does not, it will send the data through
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the Control Endpoint (Endpoint 0).
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@ingroup API
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@param device A device handle returned from hid_open().
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@param data The data to send, including the report number as
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the first byte.
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@param length The length in bytes of the data to send.
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@returns
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This function returns the actual number of bytes written and
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-1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_write(hid_device *device, const unsigned char *data, size_t length);
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/** @brief Read an Input report from a HID device with timeout.
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Input reports are returned
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to the host through the INTERRUPT IN endpoint. The first byte will
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contain the Report number if the device uses numbered reports.
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@ingroup API
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@param device A device handle returned from 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
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multiple reports, make sure to read an extra byte for
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the report number.
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@param milliseconds timeout in milliseconds or -1 for blocking wait.
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@returns
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This function returns the actual number of bytes read and
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-1 on error. If no packet was available to be read within
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the timeout period, this function returns 0.
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*/
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int HID_API_EXPORT HID_API_CALL hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds);
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/** @brief Read an Input report from a HID device.
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Input reports are returned
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to the host through the INTERRUPT IN endpoint. The first byte will
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contain the Report number if the device uses numbered reports.
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@ingroup API
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@param device A device handle returned from 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
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multiple reports, make sure to read an extra byte for
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the report number.
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@returns
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This function returns the actual number of bytes read and
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-1 on error. If no packet was available to be read and
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the handle is in non-blocking mode, this function returns 0.
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*/
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int HID_API_EXPORT HID_API_CALL hid_read(hid_device *device, unsigned char *data, size_t length);
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/** @brief Set the device handle to be non-blocking.
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In non-blocking mode calls to hid_read() will return
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immediately with a value of 0 if there is no data to be
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read. In blocking mode, hid_read() will wait (block) until
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there is data to read before returning.
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Nonblocking can be turned on and off at any time.
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@ingroup API
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@param device A device handle returned from hid_open().
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@param nonblock enable or not the nonblocking reads
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- 1 to enable nonblocking
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- 0 to disable nonblocking.
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@returns
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_set_nonblocking(hid_device *device, int nonblock);
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/** @brief Send a Feature report to the device.
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Feature reports are sent over the Control endpoint as a
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Set_Report transfer. The first byte of @p data[] must
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contain the Report ID. For devices which only support a
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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,
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calls to hid_send_feature_report() will always contain one
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more byte than the report contains. For example, if a hid
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report is 16 bytes long, 17 bytes must be passed to
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hid_send_feature_report(): the Report ID (or 0x0, for
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devices which do not use numbered reports), followed by the
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report data (16 bytes). In this example, the length passed
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in would be 17.
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@ingroup API
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@param device A device handle returned from hid_open().
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@param data The data to send, including the report number as
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the first byte.
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@param length The length in bytes of the data to send, including
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the report number.
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@returns
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This function returns the actual number of bytes written and
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-1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_send_feature_report(hid_device *device, const unsigned char *data, size_t length);
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/** @brief Get a feature report from a HID device.
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Make sure to set the first byte of @p data[] to the Report
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ID of the report to be read. Make sure to allow space for
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this extra byte in @p data[].
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@ingroup API
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@param device A device handle returned from hid_open().
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@param data A buffer to put the read data into, including
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the Report ID. Set the first byte of @p data[] to the
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Report ID of the report to be read.
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@param length The number of bytes to read, including an
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extra byte for the report ID. The buffer can be longer
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than the actual report.
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@returns
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This function returns the number of bytes read and
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-1 on error.
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*/
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int HID_API_EXPORT HID_API_CALL hid_get_feature_report(hid_device *device, unsigned char *data, size_t length);
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/** @brief Close a HID device.
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@ingroup API
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@param device A device handle returned from hid_open().
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*/
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void HID_API_EXPORT HID_API_CALL hid_close(hid_device *device);
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/** @brief Get The Manufacturer String from a HID device.
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@ingroup API
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@param device A device handle returned from 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
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT_CALL hid_get_manufacturer_string(hid_device *device, wchar_t *string, size_t maxlen);
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/** @brief Get The Product String from a HID device.
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@ingroup API
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@param device A device handle returned from 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
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT_CALL hid_get_product_string(hid_device *device, wchar_t *string, size_t maxlen);
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/** @brief Get The Serial Number String from a HID device.
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@ingroup API
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@param device A device handle returned from 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
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT_CALL hid_get_serial_number_string(hid_device *device, wchar_t *string, size_t maxlen);
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/** @brief Get a string from a HID device, based on its string index.
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@ingroup API
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@param device A device handle returned from 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
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This function returns 0 on success and -1 on error.
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*/
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int HID_API_EXPORT_CALL hid_get_indexed_string(hid_device *device, int string_index, wchar_t *string, size_t maxlen);
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/** @brief Get a string describing the last error which occurred.
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@ingroup API
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@param device A device handle returned from hid_open().
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@returns
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This function returns a string containing the last error
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which occurred or NULL if none has occurred.
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*/
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HID_API_EXPORT const wchar_t* HID_API_CALL hid_error(hid_device *device);
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#ifdef __cplusplus
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}
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#endif
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#endif
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