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deps/hidapi/hidapi/hidapi.h  view on Meta::CPAN

		/** @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.

			This function sets the return value of hid_error().

			@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).

			This function sets the return value of hid_error().

			@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).

			This function sets the return value of hid_error().

			@ingroup API
			@param dev 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 *dev, 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.

			This function sets the return value of hid_error().

			@ingroup API
			@param dev 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.

			This function sets the return value of hid_error().

			@ingroup API
			@param dev 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 *dev, 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 dev 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 *dev, 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.

			This function sets the return value of hid_error().

			@ingroup API
			@param dev 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 *dev, 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].

			This function sets the return value of hid_error().

			@ingroup API
			@param dev 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 *dev, unsigned char *data, size_t length);

		/** @brief Get a input 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