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libusb.h
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libusb.h
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/*
* Public libusb header file
* Copyright (C) 2007-2008 Daniel Drake <dsd@gentoo.org>
* Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __LIBUSB_H__
#define __LIBUSB_H__
/* MSVC doesn't like inline, but does accept __inline ?? */
#ifdef _MSC_VER
#define inline __inline
#endif
#include <stdint.h>
#include <sys/types.h>
#include <time.h>
#include <limits.h>
#if defined(__linux) || defined(__APPLE__) || defined(__CYGWIN__)
#include <sys/time.h>
#endif
/* 'interface' might be defined as a macro on Windows, so we need to
* undefine it so as not to break the current libusb API, because
* libusb_config_descriptor has an 'interface' member
* As this can be problematic if you include windows.h after libusb.h
* in your sources, we force windows.h to be included first. */
#if defined(_WIN32) || defined(__CYGWIN__)
#include <windows.h>
#if defined(interface)
#undef interface
#endif
#endif
/** \def LIBUSB_CALL
* \ingroup misc
* libusb's Windows calling convention.
*
* Under Windows, the selection of available compilers and configurations
* means that, unlike other platforms, there is not <em>one true calling
* convention</em> (calling convention: the manner in which parameters are
* passed to funcions in the generated assembly code).
*
* Matching the Windows API itself, libusb uses the WINAPI convention (which
* translates to the <tt>stdcall</tt> convention) and guarantees that the
* library is compiled in this way. The public header file also includes
* appropriate annotations so that your own software will use the right
* convention, even if another convention is being used by default within
* your codebase.
*
* The one consideration that you must apply in your software is to mark
* all functions which you use as libusb callbacks with this LIBUSB_CALL
* annotation, so that they too get compiled for the correct calling
* convention.
*
* On non-Windows operating systems, this macro is defined as nothing. This
* means that you can apply it to your code without worrying about
* cross-platform compatibility.
*/
/* LIBUSB_CALL must be defined on both definition and declaration of libusb
* functions. You'd think that declaration would be enough, but cygwin will
* complain about conflicting types unless both are marked this way.
* The placement of this macro is important too; it must appear after the
* return type, before the function name. See internal documentation for
* API_EXPORTED.
*/
#if defined(_WIN32) || defined(__CYGWIN__)
#define LIBUSB_CALL WINAPI
#else
#define LIBUSB_CALL
#endif
#ifdef __cplusplus
extern "C" {
#endif
/** \def libusb_cpu_to_le16
* \ingroup misc
* Convert a 16-bit value from host-endian to little-endian format. On
* little endian systems, this function does nothing. On big endian systems,
* the bytes are swapped.
* \param x the host-endian value to convert
* \returns the value in little-endian byte order
*/
static inline uint16_t libusb_cpu_to_le16(const uint16_t x)
{
union {
uint8_t b8[2];
uint16_t b16;
} _tmp;
_tmp.b8[1] = x >> 8;
_tmp.b8[0] = x & 0xff;
return _tmp.b16;
}
/** \def libusb_le16_to_cpu
* \ingroup misc
* Convert a 16-bit value from little-endian to host-endian format. On
* little endian systems, this function does nothing. On big endian systems,
* the bytes are swapped.
* \param x the little-endian value to convert
* \returns the value in host-endian byte order
*/
#define libusb_le16_to_cpu libusb_cpu_to_le16
/* standard USB stuff */
/** \ingroup desc
* Device and/or Interface Class codes */
enum libusb_class_code {
/** In the context of a \ref libusb_device_descriptor "device descriptor",
* this bDeviceClass value indicates that each interface specifies its
* own class information and all interfaces operate independently.
*/
LIBUSB_CLASS_PER_INTERFACE = 0,
/** Audio class */
LIBUSB_CLASS_AUDIO = 1,
/** Communications class */
LIBUSB_CLASS_COMM = 2,
/** Human Interface Device class */
LIBUSB_CLASS_HID = 3,
/** Printer dclass */
LIBUSB_CLASS_PRINTER = 7,
/** Picture transfer protocol class */
LIBUSB_CLASS_PTP = 6,
/** Mass storage class */
LIBUSB_CLASS_MASS_STORAGE = 8,
/** Hub class */
LIBUSB_CLASS_HUB = 9,
/** Data class */
LIBUSB_CLASS_DATA = 10,
/** Wireless class */
LIBUSB_CLASS_WIRELESS = 0xe0,
/** Application class */
LIBUSB_CLASS_APPLICATION = 0xfe,
/** Class is vendor-specific */
LIBUSB_CLASS_VENDOR_SPEC = 0xff
};
/** \ingroup desc
* Descriptor types as defined by the USB specification. */
enum libusb_descriptor_type {
/** Device descriptor. See libusb_device_descriptor. */
LIBUSB_DT_DEVICE = 0x01,
/** Configuration descriptor. See libusb_config_descriptor. */
LIBUSB_DT_CONFIG = 0x02,
/** String descriptor */
LIBUSB_DT_STRING = 0x03,
/** Interface descriptor. See libusb_interface_descriptor. */
LIBUSB_DT_INTERFACE = 0x04,
/** Endpoint descriptor. See libusb_endpoint_descriptor. */
LIBUSB_DT_ENDPOINT = 0x05,
/** HID descriptor */
LIBUSB_DT_HID = 0x21,
/** HID report descriptor */
LIBUSB_DT_REPORT = 0x22,
/** Physical descriptor */
LIBUSB_DT_PHYSICAL = 0x23,
/** Hub descriptor */
LIBUSB_DT_HUB = 0x29
};
/* Descriptor sizes per descriptor type */
#define LIBUSB_DT_DEVICE_SIZE 18
#define LIBUSB_DT_CONFIG_SIZE 9
#define LIBUSB_DT_INTERFACE_SIZE 9
#define LIBUSB_DT_ENDPOINT_SIZE 7
#define LIBUSB_DT_ENDPOINT_AUDIO_SIZE 9 /* Audio extension */
#define LIBUSB_DT_HUB_NONVAR_SIZE 7
#define LIBUSB_ENDPOINT_ADDRESS_MASK 0x0f /* in bEndpointAddress */
#define LIBUSB_ENDPOINT_DIR_MASK 0x80
/** \ingroup desc
* Endpoint direction. Values for bit 7 of the
* \ref libusb_endpoint_descriptor::bEndpointAddress "endpoint address" scheme.
*/
enum libusb_endpoint_direction {
/** In: device-to-host */
LIBUSB_ENDPOINT_IN = 0x80,
/** Out: host-to-device */
LIBUSB_ENDPOINT_OUT = 0x00
};
#define LIBUSB_TRANSFER_TYPE_MASK 0x03 /* in bmAttributes */
/** \ingroup desc
* Endpoint transfer type. Values for bits 0:1 of the
* \ref libusb_endpoint_descriptor::bmAttributes "endpoint attributes" field.
*/
enum libusb_transfer_type {
/** Control endpoint */
LIBUSB_TRANSFER_TYPE_CONTROL = 0,
/** Isochronous endpoint */
LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1,
/** Bulk endpoint */
LIBUSB_TRANSFER_TYPE_BULK = 2,
/** Interrupt endpoint */
LIBUSB_TRANSFER_TYPE_INTERRUPT = 3
};
/** \ingroup misc
* Standard requests, as defined in table 9-3 of the USB2 specifications */
enum libusb_standard_request {
/** Request status of the specific recipient */
LIBUSB_REQUEST_GET_STATUS = 0x00,
/** Clear or disable a specific feature */
LIBUSB_REQUEST_CLEAR_FEATURE = 0x01,
/* 0x02 is reserved */
/** Set or enable a specific feature */
LIBUSB_REQUEST_SET_FEATURE = 0x03,
/* 0x04 is reserved */
/** Set device address for all future accesses */
LIBUSB_REQUEST_SET_ADDRESS = 0x05,
/** Get the specified descriptor */
LIBUSB_REQUEST_GET_DESCRIPTOR = 0x06,
/** Used to update existing descriptors or add new descriptors */
LIBUSB_REQUEST_SET_DESCRIPTOR = 0x07,
/** Get the current device configuration value */
LIBUSB_REQUEST_GET_CONFIGURATION = 0x08,
/** Set device configuration */
LIBUSB_REQUEST_SET_CONFIGURATION = 0x09,
/** Return the selected alternate setting for the specified interface */
LIBUSB_REQUEST_GET_INTERFACE = 0x0A,
/** Select an alternate interface for the specified interface */
LIBUSB_REQUEST_SET_INTERFACE = 0x0B,
/** Set then report an endpoint's synchronization frame */
LIBUSB_REQUEST_SYNCH_FRAME = 0x0C
};
/** \ingroup misc
* Request type bits of the
* \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
* transfers. */
enum libusb_request_type {
/** Standard */
LIBUSB_REQUEST_TYPE_STANDARD = (0x00 << 5),
/** Class */
LIBUSB_REQUEST_TYPE_CLASS = (0x01 << 5),
/** Vendor */
LIBUSB_REQUEST_TYPE_VENDOR = (0x02 << 5),
/** Reserved */
LIBUSB_REQUEST_TYPE_RESERVED = (0x03 << 5)
};
/** \ingroup misc
* Recipient bits of the
* \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
* transfers. Values 4 through 31 are reserved. */
enum libusb_request_recipient {
/** Device */
LIBUSB_RECIPIENT_DEVICE = 0x00,
/** Interface */
LIBUSB_RECIPIENT_INTERFACE = 0x01,
/** Endpoint */
LIBUSB_RECIPIENT_ENDPOINT = 0x02,
/** Other */
LIBUSB_RECIPIENT_OTHER = 0x03
};
#define LIBUSB_ISO_SYNC_TYPE_MASK 0x0C
/** \ingroup desc
* Synchronization type for isochronous endpoints. Values for bits 2:3 of the
* \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
* libusb_endpoint_descriptor.
*/
enum libusb_iso_sync_type {
/** No synchronization */
LIBUSB_ISO_SYNC_TYPE_NONE = 0,
/** Asynchronous */
LIBUSB_ISO_SYNC_TYPE_ASYNC = 1,
/** Adaptive */
LIBUSB_ISO_SYNC_TYPE_ADAPTIVE = 2,
/** Synchronous */
LIBUSB_ISO_SYNC_TYPE_SYNC = 3
};
#define LIBUSB_ISO_USAGE_TYPE_MASK 0x30
/** \ingroup desc
* Usage type for isochronous endpoints. Values for bits 4:5 of the
* \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
* libusb_endpoint_descriptor.
*/
enum libusb_iso_usage_type {
/** Data endpoint */
LIBUSB_ISO_USAGE_TYPE_DATA = 0,
/** Feedback endpoint */
LIBUSB_ISO_USAGE_TYPE_FEEDBACK = 1,
/** Implicit feedback Data endpoint */
LIBUSB_ISO_USAGE_TYPE_IMPLICIT = 2
};
/** \ingroup desc
* A structure representing the standard USB device descriptor. This
* descriptor is documented in section 9.6.1 of the USB 2.0 specification.
* All multiple-byte fields are represented in host-endian format.
*/
struct libusb_device_descriptor {
/** Size of this descriptor (in bytes) */
uint8_t bLength;
/** Descriptor type. Will have value
* \ref libusb_descriptor_type::LIBUSB_DT_DEVICE LIBUSB_DT_DEVICE in this
* context. */
uint8_t bDescriptorType;
/** USB specification release number in binary-coded decimal. A value of
* 0x0200 indicates USB 2.0, 0x0110 indicates USB 1.1, etc. */
uint16_t bcdUSB;
/** USB-IF class code for the device. See \ref libusb_class_code. */
uint8_t bDeviceClass;
/** USB-IF subclass code for the device, qualified by the bDeviceClass
* value */
uint8_t bDeviceSubClass;
/** USB-IF protocol code for the device, qualified by the bDeviceClass and
* bDeviceSubClass values */
uint8_t bDeviceProtocol;
/** Maximum packet size for endpoint 0 */
uint8_t bMaxPacketSize0;
/** USB-IF vendor ID */
uint16_t idVendor;
/** USB-IF product ID */
uint16_t idProduct;
/** Device release number in binary-coded decimal */
uint16_t bcdDevice;
/** Index of string descriptor describing manufacturer */
uint8_t iManufacturer;
/** Index of string descriptor describing product */
uint8_t iProduct;
/** Index of string descriptor containing device serial number */
uint8_t iSerialNumber;
/** Number of possible configurations */
uint8_t bNumConfigurations;
};
/** \ingroup desc
* A structure representing the standard USB endpoint descriptor. This
* descriptor is documented in section 9.6.3 of the USB 2.0 specification.
* All multiple-byte fields are represented in host-endian format.
*/
struct libusb_endpoint_descriptor {
/** Size of this descriptor (in bytes) */
uint8_t bLength;
/** Descriptor type. Will have value
* \ref libusb_descriptor_type::LIBUSB_DT_ENDPOINT LIBUSB_DT_ENDPOINT in
* this context. */
uint8_t bDescriptorType;
/** The address of the endpoint described by this descriptor. Bits 0:3 are
* the endpoint number. Bits 4:6 are reserved. Bit 7 indicates direction,
* see \ref libusb_endpoint_direction.
*/
uint8_t bEndpointAddress;
/** Attributes which apply to the endpoint when it is configured using
* the bConfigurationValue. Bits 0:1 determine the transfer type and
* correspond to \ref libusb_transfer_type. Bits 2:3 are only used for
* isochronous endpoints and correspond to \ref libusb_iso_sync_type.
* Bits 4:5 are also only used for isochronous endpoints and correspond to
* \ref libusb_iso_usage_type. Bits 6:7 are reserved.
*/
uint8_t bmAttributes;
/** Maximum packet size this endpoint is capable of sending/receiving. */
uint16_t wMaxPacketSize;
/** Interval for polling endpoint for data transfers. */
uint8_t bInterval;
/** For audio devices only: the rate at which synchronization feedback
* is provided. */
uint8_t bRefresh;
/** For audio devices only: the address if the synch endpoint */
uint8_t bSynchAddress;
/** Extra descriptors. If libusb encounters unknown endpoint descriptors,
* it will store them here, should you wish to parse them. */
const unsigned char *extra;
/** Length of the extra descriptors, in bytes. */
int extra_length;
};
/** \ingroup desc
* A structure representing the standard USB interface descriptor. This
* descriptor is documented in section 9.6.5 of the USB 2.0 specification.
* All multiple-byte fields are represented in host-endian format.
*/
struct libusb_interface_descriptor {
/** Size of this descriptor (in bytes) */
uint8_t bLength;
/** Descriptor type. Will have value
* \ref libusb_descriptor_type::LIBUSB_DT_INTERFACE LIBUSB_DT_INTERFACE
* in this context. */
uint8_t bDescriptorType;
/** Number of this interface */
uint8_t bInterfaceNumber;
/** Value used to select this alternate setting for this interface */
uint8_t bAlternateSetting;
/** Number of endpoints used by this interface (excluding the control
* endpoint). */
uint8_t bNumEndpoints;
/** USB-IF class code for this interface. See \ref libusb_class_code. */
uint8_t bInterfaceClass;
/** USB-IF subclass code for this interface, qualified by the
* bInterfaceClass value */
uint8_t bInterfaceSubClass;
/** USB-IF protocol code for this interface, qualified by the
* bInterfaceClass and bInterfaceSubClass values */
uint8_t bInterfaceProtocol;
/** Index of string descriptor describing this interface */
uint8_t iInterface;
/** Array of endpoint descriptors. This length of this array is determined
* by the bNumEndpoints field. */
const struct libusb_endpoint_descriptor *endpoint;
/** Extra descriptors. If libusb encounters unknown interface descriptors,
* it will store them here, should you wish to parse them. */
const unsigned char *extra;
/** Length of the extra descriptors, in bytes. */
int extra_length;
};
/** \ingroup desc
* A collection of alternate settings for a particular USB interface.
*/
struct libusb_interface {
/** Array of interface descriptors. The length of this array is determined
* by the num_altsetting field. */
const struct libusb_interface_descriptor *altsetting;
/** The number of alternate settings that belong to this interface */
int num_altsetting;
};
/** \ingroup desc
* A structure representing the standard USB configuration descriptor. This
* descriptor is documented in section 9.6.3 of the USB 2.0 specification.
* All multiple-byte fields are represented in host-endian format.
*/
struct libusb_config_descriptor {
/** Size of this descriptor (in bytes) */
uint8_t bLength;
/** Descriptor type. Will have value
* \ref libusb_descriptor_type::LIBUSB_DT_CONFIG LIBUSB_DT_CONFIG
* in this context. */
uint8_t bDescriptorType;
/** Total length of data returned for this configuration */
uint16_t wTotalLength;
/** Number of interfaces supported by this configuration */
uint8_t bNumInterfaces;
/** Identifier value for this configuration */
uint8_t bConfigurationValue;
/** Index of string descriptor describing this configuration */
uint8_t iConfiguration;
/** Configuration characteristics */
uint8_t bmAttributes;
/** Maximum power consumption of the USB device from this bus in this
* configuration when the device is fully opreation. Expressed in units
* of 2 mA. */
uint8_t MaxPower;
/** Array of interfaces supported by this configuration. The length of
* this array is determined by the bNumInterfaces field. */
const struct libusb_interface *interface;
/** Extra descriptors. If libusb encounters unknown configuration
* descriptors, it will store them here, should you wish to parse them. */
const unsigned char *extra;
/** Length of the extra descriptors, in bytes. */
int extra_length;
};
/** \ingroup asyncio
* Setup packet for control transfers. */
struct libusb_control_setup {
/** Request type. Bits 0:4 determine recipient, see
* \ref libusb_request_recipient. Bits 5:6 determine type, see
* \ref libusb_request_type. Bit 7 determines data transfer direction, see
* \ref libusb_endpoint_direction.
*/
uint8_t bmRequestType;
/** Request. If the type bits of bmRequestType are equal to
* \ref libusb_request_type::LIBUSB_REQUEST_TYPE_STANDARD
* "LIBUSB_REQUEST_TYPE_STANDARD" then this field refers to
* \ref libusb_standard_request. For other cases, use of this field is
* application-specific. */
uint8_t bRequest;
/** Value. Varies according to request */
uint16_t wValue;
/** Index. Varies according to request, typically used to pass an index
* or offset */
uint16_t wIndex;
/** Number of bytes to transfer */
uint16_t wLength;
};
#define LIBUSB_CONTROL_SETUP_SIZE (sizeof(struct libusb_control_setup))
/* libusb */
struct libusb_context;
struct libusb_device;
struct libusb_device_handle;
/** \ingroup lib
* Structure representing a libusb session. The concept of individual libusb
* sessions allows for your program to use two libraries (or dynamically
* load two modules) which both independently use libusb. This will prevent
* interference between the individual libusb users - for example
* libusb_set_debug() will not affect the other user of the library, and
* libusb_exit() will not destroy resources that the other user is still
* using.
*
* Sessions are created by libusb_init() and destroyed through libusb_exit().
* If your application is guaranteed to only ever include a single libusb
* user (i.e. you), you do not have to worry about contexts: pass NULL in
* every function call where a context is required. The default context
* will be used.
*
* For more information, see \ref contexts.
*/
typedef struct libusb_context libusb_context;
/** \ingroup dev
* Structure representing a USB device detected on the system. This is an
* opaque type for which you are only ever provided with a pointer, usually
* originating from libusb_get_device_list().
*
* Certain operations can be performed on a device, but in order to do any
* I/O you will have to first obtain a device handle using libusb_open().
*
* Devices are reference counted with libusb_device_ref() and
* libusb_device_unref(), and are freed when the reference count reaches 0.
* New devices presented by libusb_get_device_list() have a reference count of
* 1, and libusb_free_device_list() can optionally decrease the reference count
* on all devices in the list. libusb_open() adds another reference which is
* later destroyed by libusb_close().
*/
typedef struct libusb_device libusb_device;
/** \ingroup dev
* Structure representing a handle on a USB device. This is an opaque type for
* which you are only ever provided with a pointer, usually originating from
* libusb_open().
*
* A device handle is used to perform I/O and other operations. When finished
* with a device handle, you should call libusb_close().
*/
typedef struct libusb_device_handle libusb_device_handle;
/** \ingroup misc
* Error codes. Most libusb functions return 0 on success or one of these
* codes on failure.
* You can use libusb_strerror() to retrieve a short string description of
* a libusb_error enumeration value.
*/
enum libusb_error {
/** Success (no error) */
LIBUSB_SUCCESS = 0,
/** Input/output error */
LIBUSB_ERROR_IO = -1,
/** Invalid parameter */
LIBUSB_ERROR_INVALID_PARAM = -2,
/** Access denied (insufficient permissions) */
LIBUSB_ERROR_ACCESS = -3,
/** No such device (it may have been disconnected) */
LIBUSB_ERROR_NO_DEVICE = -4,
/** Entity not found */
LIBUSB_ERROR_NOT_FOUND = -5,
/** Resource busy */
LIBUSB_ERROR_BUSY = -6,
/** Operation timed out */
LIBUSB_ERROR_TIMEOUT = -7,
/** Overflow */
LIBUSB_ERROR_OVERFLOW = -8,
/** Pipe error */
LIBUSB_ERROR_PIPE = -9,
/** System call interrupted (perhaps due to signal) */
LIBUSB_ERROR_INTERRUPTED = -10,
/** Insufficient memory */
LIBUSB_ERROR_NO_MEM = -11,
/** Operation not supported or unimplemented on this platform */
LIBUSB_ERROR_NOT_SUPPORTED = -12,
/** Other error */
LIBUSB_ERROR_OTHER = -99
/* IMPORTANT: when adding new values to this enum, remember to
update the libusb_strerror() function implementation! */
};
/** \ingroup asyncio
* Transfer status codes */
enum libusb_transfer_status {
/** Transfer completed without error. Note that this does not indicate
* that the entire amount of requested data was transferred. */
LIBUSB_TRANSFER_COMPLETED,
/** Transfer failed */
LIBUSB_TRANSFER_ERROR,
/** Transfer timed out */
LIBUSB_TRANSFER_TIMED_OUT,
/** Transfer was cancelled */
LIBUSB_TRANSFER_CANCELLED,
/** For bulk/interrupt endpoints: halt condition detected (endpoint
* stalled). For control endpoints: control request not supported. */
LIBUSB_TRANSFER_STALL,
/** Device was disconnected */
LIBUSB_TRANSFER_NO_DEVICE,
/** Device sent more data than requested */
LIBUSB_TRANSFER_OVERFLOW
};
/** \ingroup asyncio
* libusb_transfer.flags values */
enum libusb_transfer_flags {
/** Report short frames as errors */
LIBUSB_TRANSFER_SHORT_NOT_OK = 1<<0,
/** Automatically free() transfer buffer during libusb_free_transfer() */
LIBUSB_TRANSFER_FREE_BUFFER = 1<<1,
/** Automatically call libusb_free_transfer() after callback returns.
* If this flag is set, it is illegal to call libusb_free_transfer()
* from your transfer callback, as this will result in a double-free
* when this flag is acted upon. */
LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2
};
/** \ingroup asyncio
* Isochronous packet descriptor. */
struct libusb_iso_packet_descriptor {
/** Length of data to request in this packet */
unsigned int length;
/** Amount of data that was actually transferred */
unsigned int actual_length;
/** Status code for this packet */
enum libusb_transfer_status status;
};
struct libusb_transfer;
/** \ingroup asyncio
* Asynchronous transfer callback function type. When submitting asynchronous
* transfers, you pass a pointer to a callback function of this type via the
* \ref libusb_transfer::callback "callback" member of the libusb_transfer
* structure. libusb will call this function later, when the transfer has
* completed or failed. See \ref asyncio for more information.
* \param transfer The libusb_transfer struct the callback function is being
* notified about.
*/
typedef void (LIBUSB_CALL *libusb_transfer_cb_fn)(struct libusb_transfer *transfer);
/** \ingroup asyncio
* The generic USB transfer structure. The user populates this structure and
* then submits it in order to request a transfer. After the transfer has
* completed, the library populates the transfer with the results and passes
* it back to the user.
*/
struct libusb_transfer {
/** Handle of the device that this transfer will be submitted to */
libusb_device_handle *dev_handle;
/** A bitwise OR combination of \ref libusb_transfer_flags. */
uint8_t flags;
/** Address of the endpoint where this transfer will be sent. */
unsigned char endpoint;
/** Type of the endpoint from \ref libusb_transfer_type */
unsigned char type;
/** Timeout for this transfer in millseconds. A value of 0 indicates no
* timeout. */
unsigned int timeout;
/** The status of the transfer. Read-only, and only for use within
* transfer callback function.
*
* If this is an isochronous transfer, this field may read COMPLETED even
* if there were errors in the frames. Use the
* \ref libusb_iso_packet_descriptor::status "status" field in each packet
* to determine if errors occurred. */
enum libusb_transfer_status status;
/** Length of the data buffer */
int length;
/** Actual length of data that was transferred. Read-only, and only for
* use within transfer callback function. Not valid for isochronous
* endpoint transfers. */
int actual_length;
/** Callback function. This will be invoked when the transfer completes,
* fails, or is cancelled. */
libusb_transfer_cb_fn callback;
/** User context data to pass to the callback function. */
void *user_data;
/** Data buffer */
unsigned char *buffer;
/** Number of isochronous packets. Only used for I/O with isochronous
* endpoints. */
int num_iso_packets;
/** Isochronous packet descriptors, for isochronous transfers only. */
struct libusb_iso_packet_descriptor iso_packet_desc
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
[] /* valid C99 code */
#else
[0] /* non-standard, but usually working code */
#endif
;
};
int LIBUSB_CALL libusb_init(libusb_context **ctx);
void LIBUSB_CALL libusb_exit(libusb_context *ctx);
void LIBUSB_CALL libusb_set_debug(libusb_context *ctx, int level);
const char * LIBUSB_CALL libusb_strerror(enum libusb_error errcode);
ssize_t LIBUSB_CALL libusb_get_device_list(libusb_context *ctx,
libusb_device ***list);
void LIBUSB_CALL libusb_free_device_list(libusb_device **list,
int unref_devices);
libusb_device * LIBUSB_CALL libusb_ref_device(libusb_device *dev);
void LIBUSB_CALL libusb_unref_device(libusb_device *dev);
int LIBUSB_CALL libusb_get_configuration(libusb_device_handle *dev,
int *config);
int LIBUSB_CALL libusb_get_device_descriptor(libusb_device *dev,
struct libusb_device_descriptor *desc);
int LIBUSB_CALL libusb_get_active_config_descriptor(libusb_device *dev,
struct libusb_config_descriptor **config);
int LIBUSB_CALL libusb_get_config_descriptor(libusb_device *dev,
uint8_t config_index, struct libusb_config_descriptor **config);
int LIBUSB_CALL libusb_get_config_descriptor_by_value(libusb_device *dev,
uint8_t bConfigurationValue, struct libusb_config_descriptor **config);
void LIBUSB_CALL libusb_free_config_descriptor(
struct libusb_config_descriptor *config);
uint8_t LIBUSB_CALL libusb_get_bus_number(libusb_device *dev);
uint8_t LIBUSB_CALL libusb_get_device_address(libusb_device *dev);
int LIBUSB_CALL libusb_get_max_packet_size(libusb_device *dev,
unsigned char endpoint);
int LIBUSB_CALL libusb_get_max_iso_packet_size(libusb_device *dev,
unsigned char endpoint);
int LIBUSB_CALL libusb_open(libusb_device *dev, libusb_device_handle **handle);
void LIBUSB_CALL libusb_close(libusb_device_handle *dev_handle);
libusb_device * LIBUSB_CALL libusb_get_device(libusb_device_handle *dev_handle);
int LIBUSB_CALL libusb_set_configuration(libusb_device_handle *dev,
int configuration);
int LIBUSB_CALL libusb_claim_interface(libusb_device_handle *dev,
int interface_number);
int LIBUSB_CALL libusb_release_interface(libusb_device_handle *dev,
int interface_number);
libusb_device_handle * LIBUSB_CALL libusb_open_device_with_vid_pid(
libusb_context *ctx, uint16_t vendor_id, uint16_t product_id);
int LIBUSB_CALL libusb_set_interface_alt_setting(libusb_device_handle *dev,
int interface_number, int alternate_setting);
int LIBUSB_CALL libusb_clear_halt(libusb_device_handle *dev,
unsigned char endpoint);
int LIBUSB_CALL libusb_reset_device(libusb_device_handle *dev);
int LIBUSB_CALL libusb_kernel_driver_active(libusb_device_handle *dev,
int interface_number);
int LIBUSB_CALL libusb_detach_kernel_driver(libusb_device_handle *dev,
int interface_number);
int LIBUSB_CALL libusb_attach_kernel_driver(libusb_device_handle *dev,
int interface_number);
/* async I/O */
/** \ingroup asyncio
* Get the data section of a control transfer. This convenience function is here
* to remind you that the data does not start until 8 bytes into the actual
* buffer, as the setup packet comes first.
*
* Calling this function only makes sense from a transfer callback function,
* or situations where you have already allocated a suitably sized buffer at
* transfer->buffer.
*
* \param transfer a transfer
* \returns pointer to the first byte of the data section
*/
static inline unsigned char *libusb_control_transfer_get_data(
struct libusb_transfer *transfer)
{
return transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
}
/** \ingroup asyncio
* Get the control setup packet of a control transfer. This convenience
* function is here to remind you that the control setup occupies the first
* 8 bytes of the transfer data buffer.
*
* Calling this function only makes sense from a transfer callback function,
* or situations where you have already allocated a suitably sized buffer at
* transfer->buffer.
*
* \param transfer a transfer
* \returns a casted pointer to the start of the transfer data buffer
*/
static inline struct libusb_control_setup *libusb_control_transfer_get_setup(
struct libusb_transfer *transfer)
{
return (struct libusb_control_setup *) transfer->buffer;
}
/** \ingroup asyncio
* Helper function to populate the setup packet (first 8 bytes of the data
* buffer) for a control transfer. The wIndex, wValue and wLength values should
* be given in host-endian byte order.
*
* \param buffer buffer to output the setup packet into
* \param bmRequestType see the
* \ref libusb_control_setup::bmRequestType "bmRequestType" field of
* \ref libusb_control_setup
* \param bRequest see the
* \ref libusb_control_setup::bRequest "bRequest" field of
* \ref libusb_control_setup
* \param wValue see the
* \ref libusb_control_setup::wValue "wValue" field of
* \ref libusb_control_setup
* \param wIndex see the
* \ref libusb_control_setup::wIndex "wIndex" field of
* \ref libusb_control_setup
* \param wLength see the
* \ref libusb_control_setup::wLength "wLength" field of
* \ref libusb_control_setup
*/
static inline void libusb_fill_control_setup(unsigned char *buffer,
uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
uint16_t wLength)
{
struct libusb_control_setup *setup = (struct libusb_control_setup *) buffer;
setup->bmRequestType = bmRequestType;
setup->bRequest = bRequest;
setup->wValue = libusb_cpu_to_le16(wValue);
setup->wIndex = libusb_cpu_to_le16(wIndex);
setup->wLength = libusb_cpu_to_le16(wLength);
}
struct libusb_transfer * LIBUSB_CALL libusb_alloc_transfer(int iso_packets);
int LIBUSB_CALL libusb_submit_transfer(struct libusb_transfer *transfer);
int LIBUSB_CALL libusb_cancel_transfer(struct libusb_transfer *transfer);
void LIBUSB_CALL libusb_free_transfer(struct libusb_transfer *transfer);
/** \ingroup asyncio
* Helper function to populate the required \ref libusb_transfer fields
* for a control transfer.
*
* If you pass a transfer buffer to this function, the first 8 bytes will
* be interpreted as a control setup packet, and the wLength field will be
* used to automatically populate the \ref libusb_transfer::length "length"
* field of the transfer. Therefore the recommended approach is:
* -# Allocate a suitably sized data buffer (including space for control setup)
* -# Call libusb_fill_control_setup()
* -# If this is a host-to-device transfer with a data stage, put the data
* in place after the setup packet
* -# Call this function
* -# Call libusb_submit_transfer()
*
* It is also legal to pass a NULL buffer to this function, in which case this
* function will not attempt to populate the length field. Remember that you
* must then populate the buffer and length fields later.
*
* \param transfer the transfer to populate
* \param dev_handle handle of the device that will handle the transfer
* \param buffer data buffer. If provided, this function will interpret the
* first 8 bytes as a setup packet and infer the transfer length from that.
* \param callback callback function to be invoked on transfer completion
* \param user_data user data to pass to callback function
* \param timeout timeout for the transfer in milliseconds
*/
static inline void libusb_fill_control_transfer(
struct libusb_transfer *transfer, libusb_device_handle *dev_handle,