| /* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */ |
| /* |
| * Core functions for libusbx |
| * Copyright © 2012-2013 Nathan Hjelm <hjelmn@cs.unm.edu> |
| * Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org> |
| * Copyright © 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 |
| */ |
| |
| #include "config.h" |
| |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #ifdef HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| #ifdef HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| #ifdef HAVE_SYSLOG_H |
| #include <syslog.h> |
| #endif |
| |
| #ifdef __ANDROID__ |
| #include <android/log.h> |
| #endif |
| |
| #include "libusbi.h" |
| #include "hotplug.h" |
| |
| #if defined(OS_LINUX) |
| const struct usbi_os_backend * const usbi_backend = &linux_usbfs_backend; |
| #elif defined(OS_DARWIN) |
| const struct usbi_os_backend * const usbi_backend = &darwin_backend; |
| #elif defined(OS_OPENBSD) |
| const struct usbi_os_backend * const usbi_backend = &openbsd_backend; |
| #elif defined(OS_NETBSD) |
| const struct usbi_os_backend * const usbi_backend = &netbsd_backend; |
| #elif defined(OS_WINDOWS) |
| const struct usbi_os_backend * const usbi_backend = &windows_backend; |
| #elif defined(OS_WINCE) |
| const struct usbi_os_backend * const usbi_backend = &wince_backend; |
| #else |
| #error "Unsupported OS" |
| #endif |
| |
| struct libusb_context *usbi_default_context = NULL; |
| static const struct libusb_version libusb_version_internal = |
| { LIBUSB_MAJOR, LIBUSB_MINOR, LIBUSB_MICRO, LIBUSB_NANO, |
| LIBUSB_RC, "http://libusbx.org" }; |
| static int default_context_refcnt = 0; |
| static usbi_mutex_static_t default_context_lock = USBI_MUTEX_INITIALIZER; |
| static struct timeval timestamp_origin = { 0, 0 }; |
| |
| usbi_mutex_static_t active_contexts_lock = USBI_MUTEX_INITIALIZER; |
| struct list_head active_contexts_list; |
| |
| /** |
| * \mainpage libusbx-1.0 API Reference |
| * |
| * \section intro Introduction |
| * |
| * libusbx is an open source library that allows you to communicate with USB |
| * devices from userspace. For more info, see the |
| * <a href="http://libusbx.org">libusbx homepage</a>. |
| * |
| * This documentation is aimed at application developers wishing to |
| * communicate with USB peripherals from their own software. After reviewing |
| * this documentation, feedback and questions can be sent to the |
| * <a href="http://mailing-list.libusbx.org">libusbx-devel mailing list</a>. |
| * |
| * This documentation assumes knowledge of how to operate USB devices from |
| * a software standpoint (descriptors, configurations, interfaces, endpoints, |
| * control/bulk/interrupt/isochronous transfers, etc). Full information |
| * can be found in the <a href="http://www.usb.org/developers/docs/">USB 3.0 |
| * Specification</a> which is available for free download. You can probably |
| * find less verbose introductions by searching the web. |
| * |
| * \section features Library features |
| * |
| * - All transfer types supported (control/bulk/interrupt/isochronous) |
| * - 2 transfer interfaces: |
| * -# Synchronous (simple) |
| * -# Asynchronous (more complicated, but more powerful) |
| * - Thread safe (although the asynchronous interface means that you |
| * usually won't need to thread) |
| * - Lightweight with lean API |
| * - Compatible with libusb-0.1 through the libusb-compat-0.1 translation layer |
| * - Hotplug support (on some platforms). See \ref hotplug. |
| * |
| * \section gettingstarted Getting Started |
| * |
| * To begin reading the API documentation, start with the Modules page which |
| * links to the different categories of libusbx's functionality. |
| * |
| * One decision you will have to make is whether to use the synchronous |
| * or the asynchronous data transfer interface. The \ref io documentation |
| * provides some insight into this topic. |
| * |
| * Some example programs can be found in the libusbx source distribution under |
| * the "examples" subdirectory. The libusbx homepage includes a list of |
| * real-life project examples which use libusbx. |
| * |
| * \section errorhandling Error handling |
| * |
| * libusbx functions typically return 0 on success or a negative error code |
| * on failure. These negative error codes relate to LIBUSB_ERROR constants |
| * which are listed on the \ref misc "miscellaneous" documentation page. |
| * |
| * \section msglog Debug message logging |
| * |
| * libusbx uses stderr for all logging. By default, logging is set to NONE, |
| * which means that no output will be produced. However, unless the library |
| * has been compiled with logging disabled, then any application calls to |
| * libusb_set_debug(), or the setting of the environmental variable |
| * LIBUSB_DEBUG outside of the application, can result in logging being |
| * produced. Your application should therefore not close stderr, but instead |
| * direct it to the null device if its output is undesireable. |
| * |
| * The libusb_set_debug() function can be used to enable logging of certain |
| * messages. Under standard configuration, libusbx doesn't really log much |
| * so you are advised to use this function to enable all error/warning/ |
| * informational messages. It will help debug problems with your software. |
| * |
| * The logged messages are unstructured. There is no one-to-one correspondence |
| * between messages being logged and success or failure return codes from |
| * libusbx functions. There is no format to the messages, so you should not |
| * try to capture or parse them. They are not and will not be localized. |
| * These messages are not intended to being passed to your application user; |
| * instead, you should interpret the error codes returned from libusbx functions |
| * and provide appropriate notification to the user. The messages are simply |
| * there to aid you as a programmer, and if you're confused because you're |
| * getting a strange error code from a libusbx function, enabling message |
| * logging may give you a suitable explanation. |
| * |
| * The LIBUSB_DEBUG environment variable can be used to enable message logging |
| * at run-time. This environment variable should be set to a log level number, |
| * which is interpreted the same as the libusb_set_debug() parameter. When this |
| * environment variable is set, the message logging verbosity level is fixed |
| * and libusb_set_debug() effectively does nothing. |
| * |
| * libusbx can be compiled without any logging functions, useful for embedded |
| * systems. In this case, libusb_set_debug() and the LIBUSB_DEBUG environment |
| * variable have no effects. |
| * |
| * libusbx can also be compiled with verbose debugging messages always. When |
| * the library is compiled in this way, all messages of all verbosities are |
| * always logged. libusb_set_debug() and the LIBUSB_DEBUG environment variable |
| * have no effects. |
| * |
| * \section remarks Other remarks |
| * |
| * libusbx does have imperfections. The \ref caveats "caveats" page attempts |
| * to document these. |
| */ |
| |
| /** |
| * \page caveats Caveats |
| * |
| * \section devresets Device resets |
| * |
| * The libusb_reset_device() function allows you to reset a device. If your |
| * program has to call such a function, it should obviously be aware that |
| * the reset will cause device state to change (e.g. register values may be |
| * reset). |
| * |
| * The problem is that any other program could reset the device your program |
| * is working with, at any time. libusbx does not offer a mechanism to inform |
| * you when this has happened, so if someone else resets your device it will |
| * not be clear to your own program why the device state has changed. |
| * |
| * Ultimately, this is a limitation of writing drivers in userspace. |
| * Separation from the USB stack in the underlying kernel makes it difficult |
| * for the operating system to deliver such notifications to your program. |
| * The Linux kernel USB stack allows such reset notifications to be delivered |
| * to in-kernel USB drivers, but it is not clear how such notifications could |
| * be delivered to second-class drivers that live in userspace. |
| * |
| * \section blockonly Blocking-only functionality |
| * |
| * The functionality listed below is only available through synchronous, |
| * blocking functions. There are no asynchronous/non-blocking alternatives, |
| * and no clear ways of implementing these. |
| * |
| * - Configuration activation (libusb_set_configuration()) |
| * - Interface/alternate setting activation (libusb_set_interface_alt_setting()) |
| * - Releasing of interfaces (libusb_release_interface()) |
| * - Clearing of halt/stall condition (libusb_clear_halt()) |
| * - Device resets (libusb_reset_device()) |
| * |
| * \section configsel Configuration selection and handling |
| * |
| * When libusbx presents a device handle to an application, there is a chance |
| * that the corresponding device may be in unconfigured state. For devices |
| * with multiple configurations, there is also a chance that the configuration |
| * currently selected is not the one that the application wants to use. |
| * |
| * The obvious solution is to add a call to libusb_set_configuration() early |
| * on during your device initialization routines, but there are caveats to |
| * be aware of: |
| * -# If the device is already in the desired configuration, calling |
| * libusb_set_configuration() using the same configuration value will cause |
| * a lightweight device reset. This may not be desirable behaviour. |
| * -# libusbx will be unable to change configuration if the device is in |
| * another configuration and other programs or drivers have claimed |
| * interfaces under that configuration. |
| * -# In the case where the desired configuration is already active, libusbx |
| * may not even be able to perform a lightweight device reset. For example, |
| * take my USB keyboard with fingerprint reader: I'm interested in driving |
| * the fingerprint reader interface through libusbx, but the kernel's |
| * USB-HID driver will almost always have claimed the keyboard interface. |
| * Because the kernel has claimed an interface, it is not even possible to |
| * perform the lightweight device reset, so libusb_set_configuration() will |
| * fail. (Luckily the device in question only has a single configuration.) |
| * |
| * One solution to some of the above problems is to consider the currently |
| * active configuration. If the configuration we want is already active, then |
| * we don't have to select any configuration: |
| \code |
| cfg = libusb_get_configuration(dev); |
| if (cfg != desired) |
| libusb_set_configuration(dev, desired); |
| \endcode |
| * |
| * This is probably suitable for most scenarios, but is inherently racy: |
| * another application or driver may change the selected configuration |
| * <em>after</em> the libusb_get_configuration() call. |
| * |
| * Even in cases where libusb_set_configuration() succeeds, consider that other |
| * applications or drivers may change configuration after your application |
| * calls libusb_set_configuration(). |
| * |
| * One possible way to lock your device into a specific configuration is as |
| * follows: |
| * -# Set the desired configuration (or use the logic above to realise that |
| * it is already in the desired configuration) |
| * -# Claim the interface that you wish to use |
| * -# Check that the currently active configuration is the one that you want |
| * to use. |
| * |
| * The above method works because once an interface is claimed, no application |
| * or driver is able to select another configuration. |
| * |
| * \section earlycomp Early transfer completion |
| * |
| * NOTE: This section is currently Linux-centric. I am not sure if any of these |
| * considerations apply to Darwin or other platforms. |
| * |
| * When a transfer completes early (i.e. when less data is received/sent in |
| * any one packet than the transfer buffer allows for) then libusbx is designed |
| * to terminate the transfer immediately, not transferring or receiving any |
| * more data unless other transfers have been queued by the user. |
| * |
| * On legacy platforms, libusbx is unable to do this in all situations. After |
| * the incomplete packet occurs, "surplus" data may be transferred. For recent |
| * versions of libusbx, this information is kept (the data length of the |
| * transfer is updated) and, for device-to-host transfers, any surplus data was |
| * added to the buffer. Still, this is not a nice solution because it loses the |
| * information about the end of the short packet, and the user probably wanted |
| * that surplus data to arrive in the next logical transfer. |
| * |
| * |
| * \section zlp Zero length packets |
| * |
| * - libusbx is able to send a packet of zero length to an endpoint simply by |
| * submitting a transfer of zero length. |
| * - The \ref libusb_transfer_flags::LIBUSB_TRANSFER_ADD_ZERO_PACKET |
| * "LIBUSB_TRANSFER_ADD_ZERO_PACKET" flag is currently only supported on Linux. |
| */ |
| |
| /** |
| * \page contexts Contexts |
| * |
| * It is possible that libusbx may be used simultaneously from two independent |
| * libraries linked into the same executable. For example, if your application |
| * has a plugin-like system which allows the user to dynamically load a range |
| * of modules into your program, it is feasible that two independently |
| * developed modules may both use libusbx. |
| * |
| * libusbx is written to allow for these multiple user scenarios. The two |
| * "instances" of libusbx will not interfere: libusb_set_debug() calls |
| * from one user will not affect the same settings for other users, other |
| * users can continue using libusbx after one of them calls libusb_exit(), etc. |
| * |
| * This is made possible through libusbx's <em>context</em> concept. When you |
| * call libusb_init(), you are (optionally) given a context. You can then pass |
| * this context pointer back into future libusbx functions. |
| * |
| * In order to keep things simple for more simplistic applications, it is |
| * legal to pass NULL to all functions requiring a context pointer (as long as |
| * you're sure no other code will attempt to use libusbx from the same process). |
| * When you pass NULL, the default context will be used. The default context |
| * is created the first time a process calls libusb_init() when no other |
| * context is alive. Contexts are destroyed during libusb_exit(). |
| * |
| * The default context is reference-counted and can be shared. That means that |
| * if libusb_init(NULL) is called twice within the same process, the two |
| * users end up sharing the same context. The deinitialization and freeing of |
| * the default context will only happen when the last user calls libusb_exit(). |
| * In other words, the default context is created and initialized when its |
| * reference count goes from 0 to 1, and is deinitialized and destroyed when |
| * its reference count goes from 1 to 0. |
| * |
| * You may be wondering why only a subset of libusbx functions require a |
| * context pointer in their function definition. Internally, libusbx stores |
| * context pointers in other objects (e.g. libusb_device instances) and hence |
| * can infer the context from those objects. |
| */ |
| |
| /** |
| * @defgroup lib Library initialization/deinitialization |
| * This page details how to initialize and deinitialize libusbx. Initialization |
| * must be performed before using any libusbx functionality, and similarly you |
| * must not call any libusbx functions after deinitialization. |
| */ |
| |
| /** |
| * @defgroup dev Device handling and enumeration |
| * The functionality documented below is designed to help with the following |
| * operations: |
| * - Enumerating the USB devices currently attached to the system |
| * - Choosing a device to operate from your software |
| * - Opening and closing the chosen device |
| * |
| * \section nutshell In a nutshell... |
| * |
| * The description below really makes things sound more complicated than they |
| * actually are. The following sequence of function calls will be suitable |
| * for almost all scenarios and does not require you to have such a deep |
| * understanding of the resource management issues: |
| * \code |
| // discover devices |
| libusb_device **list; |
| libusb_device *found = NULL; |
| ssize_t cnt = libusb_get_device_list(NULL, &list); |
| ssize_t i = 0; |
| int err = 0; |
| if (cnt < 0) |
| error(); |
| |
| for (i = 0; i < cnt; i++) { |
| libusb_device *device = list[i]; |
| if (is_interesting(device)) { |
| found = device; |
| break; |
| } |
| } |
| |
| if (found) { |
| libusb_device_handle *handle; |
| |
| err = libusb_open(found, &handle); |
| if (err) |
| error(); |
| // etc |
| } |
| |
| libusb_free_device_list(list, 1); |
| \endcode |
| * |
| * The two important points: |
| * - You asked libusb_free_device_list() to unreference the devices (2nd |
| * parameter) |
| * - You opened the device before freeing the list and unreferencing the |
| * devices |
| * |
| * If you ended up with a handle, you can now proceed to perform I/O on the |
| * device. |
| * |
| * \section devshandles Devices and device handles |
| * libusbx has a concept of a USB device, represented by the |
| * \ref libusb_device opaque type. A device represents a USB device that |
| * is currently or was previously connected to the system. Using a reference |
| * to a device, you can determine certain information about the device (e.g. |
| * you can read the descriptor data). |
| * |
| * The libusb_get_device_list() function can be used to obtain a list of |
| * devices currently connected to the system. This is known as device |
| * discovery. |
| * |
| * Just because you have a reference to a device does not mean it is |
| * necessarily usable. The device may have been unplugged, you may not have |
| * permission to operate such device, or another program or driver may be |
| * using the device. |
| * |
| * When you've found a device that you'd like to operate, you must ask |
| * libusbx to open the device using the libusb_open() function. Assuming |
| * success, libusbx then returns you a <em>device handle</em> |
| * (a \ref libusb_device_handle pointer). All "real" I/O operations then |
| * operate on the handle rather than the original device pointer. |
| * |
| * \section devref Device discovery and reference counting |
| * |
| * Device discovery (i.e. calling libusb_get_device_list()) returns a |
| * freshly-allocated list of devices. The list itself must be freed when |
| * you are done with it. libusbx also needs to know when it is OK to free |
| * the contents of the list - the devices themselves. |
| * |
| * To handle these issues, libusbx provides you with two separate items: |
| * - A function to free the list itself |
| * - A reference counting system for the devices inside |
| * |
| * New devices presented by the libusb_get_device_list() function all have a |
| * reference count of 1. You can increase and decrease reference count using |
| * libusb_ref_device() and libusb_unref_device(). A device is destroyed when |
| * its reference count reaches 0. |
| * |
| * With the above information in mind, the process of opening a device can |
| * be viewed as follows: |
| * -# Discover devices using libusb_get_device_list(). |
| * -# Choose the device that you want to operate, and call libusb_open(). |
| * -# Unref all devices in the discovered device list. |
| * -# Free the discovered device list. |
| * |
| * The order is important - you must not unreference the device before |
| * attempting to open it, because unreferencing it may destroy the device. |
| * |
| * For convenience, the libusb_free_device_list() function includes a |
| * parameter to optionally unreference all the devices in the list before |
| * freeing the list itself. This combines steps 3 and 4 above. |
| * |
| * As an implementation detail, libusb_open() actually adds a reference to |
| * the device in question. This is because the device remains available |
| * through the handle via libusb_get_device(). The reference is deleted during |
| * libusb_close(). |
| */ |
| |
| /** @defgroup misc Miscellaneous */ |
| |
| /* we traverse usbfs without knowing how many devices we are going to find. |
| * so we create this discovered_devs model which is similar to a linked-list |
| * which grows when required. it can be freed once discovery has completed, |
| * eliminating the need for a list node in the libusb_device structure |
| * itself. */ |
| #define DISCOVERED_DEVICES_SIZE_STEP 8 |
| |
| static struct discovered_devs *discovered_devs_alloc(void) |
| { |
| struct discovered_devs *ret = |
| malloc(sizeof(*ret) + (sizeof(void *) * DISCOVERED_DEVICES_SIZE_STEP)); |
| |
| if (ret) { |
| ret->len = 0; |
| ret->capacity = DISCOVERED_DEVICES_SIZE_STEP; |
| } |
| return ret; |
| } |
| |
| /* append a device to the discovered devices collection. may realloc itself, |
| * returning new discdevs. returns NULL on realloc failure. */ |
| struct discovered_devs *discovered_devs_append( |
| struct discovered_devs *discdevs, struct libusb_device *dev) |
| { |
| size_t len = discdevs->len; |
| size_t capacity; |
| |
| /* if there is space, just append the device */ |
| if (len < discdevs->capacity) { |
| discdevs->devices[len] = libusb_ref_device(dev); |
| discdevs->len++; |
| return discdevs; |
| } |
| |
| /* exceeded capacity, need to grow */ |
| usbi_dbg("need to increase capacity"); |
| capacity = discdevs->capacity + DISCOVERED_DEVICES_SIZE_STEP; |
| discdevs = usbi_reallocf(discdevs, |
| sizeof(*discdevs) + (sizeof(void *) * capacity)); |
| if (discdevs) { |
| discdevs->capacity = capacity; |
| discdevs->devices[len] = libusb_ref_device(dev); |
| discdevs->len++; |
| } |
| |
| return discdevs; |
| } |
| |
| static void discovered_devs_free(struct discovered_devs *discdevs) |
| { |
| size_t i; |
| |
| for (i = 0; i < discdevs->len; i++) |
| libusb_unref_device(discdevs->devices[i]); |
| |
| free(discdevs); |
| } |
| |
| /* Allocate a new device with a specific session ID. The returned device has |
| * a reference count of 1. */ |
| struct libusb_device *usbi_alloc_device(struct libusb_context *ctx, |
| unsigned long session_id) |
| { |
| size_t priv_size = usbi_backend->device_priv_size; |
| struct libusb_device *dev = calloc(1, sizeof(*dev) + priv_size); |
| int r; |
| |
| if (!dev) |
| return NULL; |
| |
| r = usbi_mutex_init(&dev->lock, NULL); |
| if (r) { |
| free(dev); |
| return NULL; |
| } |
| |
| dev->ctx = ctx; |
| dev->refcnt = 1; |
| dev->session_data = session_id; |
| dev->speed = LIBUSB_SPEED_UNKNOWN; |
| |
| if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) { |
| usbi_connect_device (dev); |
| } |
| |
| return dev; |
| } |
| |
| void usbi_connect_device(struct libusb_device *dev) |
| { |
| libusb_hotplug_message message; |
| ssize_t ret; |
| |
| memset(&message, 0, sizeof(message)); |
| message.event = LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED; |
| message.device = dev; |
| dev->attached = 1; |
| |
| usbi_mutex_lock(&dev->ctx->usb_devs_lock); |
| list_add(&dev->list, &dev->ctx->usb_devs); |
| usbi_mutex_unlock(&dev->ctx->usb_devs_lock); |
| |
| /* Signal that an event has occurred for this device if we support hotplug AND |
| * the hotplug pipe is ready. This prevents an event from getting raised during |
| * initial enumeration. */ |
| if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) && dev->ctx->hotplug_pipe[1] > 0) { |
| ret = usbi_write(dev->ctx->hotplug_pipe[1], &message, sizeof(message)); |
| if (sizeof (message) != ret) { |
| usbi_err(DEVICE_CTX(dev), "error writing hotplug message"); |
| } |
| } |
| } |
| |
| void usbi_disconnect_device(struct libusb_device *dev) |
| { |
| libusb_hotplug_message message; |
| struct libusb_context *ctx = dev->ctx; |
| ssize_t ret; |
| |
| memset(&message, 0, sizeof(message)); |
| message.event = LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT; |
| message.device = dev; |
| usbi_mutex_lock(&dev->lock); |
| dev->attached = 0; |
| usbi_mutex_unlock(&dev->lock); |
| |
| usbi_mutex_lock(&ctx->usb_devs_lock); |
| list_del(&dev->list); |
| usbi_mutex_unlock(&ctx->usb_devs_lock); |
| |
| /* Signal that an event has occurred for this device if we support hotplug AND |
| * the hotplug pipe is ready. This prevents an event from getting raised during |
| * initial enumeration. libusb_handle_events will take care of dereferencing the |
| * device. */ |
| if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) && dev->ctx->hotplug_pipe[1] > 0) { |
| ret = usbi_write(dev->ctx->hotplug_pipe[1], &message, sizeof(message)); |
| if (sizeof(message) != ret) { |
| usbi_err(DEVICE_CTX(dev), "error writing hotplug message"); |
| } |
| } |
| } |
| |
| /* Perform some final sanity checks on a newly discovered device. If this |
| * function fails (negative return code), the device should not be added |
| * to the discovered device list. */ |
| int usbi_sanitize_device(struct libusb_device *dev) |
| { |
| int r; |
| uint8_t num_configurations; |
| |
| r = usbi_device_cache_descriptor(dev); |
| if (r < 0) |
| return r; |
| |
| num_configurations = dev->device_descriptor.bNumConfigurations; |
| if (num_configurations > USB_MAXCONFIG) { |
| usbi_err(DEVICE_CTX(dev), "too many configurations"); |
| return LIBUSB_ERROR_IO; |
| } else if (0 == num_configurations) |
| usbi_dbg("zero configurations, maybe an unauthorized device"); |
| |
| dev->num_configurations = num_configurations; |
| return 0; |
| } |
| |
| /* Examine libusbx's internal list of known devices, looking for one with |
| * a specific session ID. Returns the matching device if it was found, and |
| * NULL otherwise. */ |
| struct libusb_device *usbi_get_device_by_session_id(struct libusb_context *ctx, |
| unsigned long session_id) |
| { |
| struct libusb_device *dev; |
| struct libusb_device *ret = NULL; |
| |
| usbi_mutex_lock(&ctx->usb_devs_lock); |
| list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device) |
| if (dev->session_data == session_id) { |
| ret = dev; |
| break; |
| } |
| usbi_mutex_unlock(&ctx->usb_devs_lock); |
| |
| return ret; |
| } |
| |
| /** @ingroup dev |
| * Returns a list of USB devices currently attached to the system. This is |
| * your entry point into finding a USB device to operate. |
| * |
| * You are expected to unreference all the devices when you are done with |
| * them, and then free the list with libusb_free_device_list(). Note that |
| * libusb_free_device_list() can unref all the devices for you. Be careful |
| * not to unreference a device you are about to open until after you have |
| * opened it. |
| * |
| * This return value of this function indicates the number of devices in |
| * the resultant list. The list is actually one element larger, as it is |
| * NULL-terminated. |
| * |
| * \param ctx the context to operate on, or NULL for the default context |
| * \param list output location for a list of devices. Must be later freed with |
| * libusb_free_device_list(). |
| * \returns the number of devices in the outputted list, or any |
| * \ref libusb_error according to errors encountered by the backend. |
| */ |
| ssize_t API_EXPORTED libusb_get_device_list(libusb_context *ctx, |
| libusb_device ***list) |
| { |
| struct discovered_devs *discdevs = discovered_devs_alloc(); |
| struct libusb_device **ret; |
| int r = 0; |
| ssize_t i, len; |
| USBI_GET_CONTEXT(ctx); |
| usbi_dbg(""); |
| |
| if (!discdevs) |
| return LIBUSB_ERROR_NO_MEM; |
| |
| if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) { |
| /* backend provides hotplug support */ |
| struct libusb_device *dev; |
| |
| if (usbi_backend->hotplug_poll) |
| usbi_backend->hotplug_poll(); |
| |
| usbi_mutex_lock(&ctx->usb_devs_lock); |
| list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device) { |
| discdevs = discovered_devs_append(discdevs, dev); |
| |
| if (!discdevs) { |
| r = LIBUSB_ERROR_NO_MEM; |
| break; |
| } |
| } |
| usbi_mutex_unlock(&ctx->usb_devs_lock); |
| } else { |
| /* backend does not provide hotplug support */ |
| r = usbi_backend->get_device_list(ctx, &discdevs); |
| } |
| |
| if (r < 0) { |
| len = r; |
| goto out; |
| } |
| |
| /* convert discovered_devs into a list */ |
| len = discdevs->len; |
| ret = calloc(len + 1, sizeof(struct libusb_device *)); |
| if (!ret) { |
| len = LIBUSB_ERROR_NO_MEM; |
| goto out; |
| } |
| |
| ret[len] = NULL; |
| for (i = 0; i < len; i++) { |
| struct libusb_device *dev = discdevs->devices[i]; |
| ret[i] = libusb_ref_device(dev); |
| } |
| *list = ret; |
| |
| out: |
| discovered_devs_free(discdevs); |
| return len; |
| } |
| |
| /** \ingroup dev |
| * Frees a list of devices previously discovered using |
| * libusb_get_device_list(). If the unref_devices parameter is set, the |
| * reference count of each device in the list is decremented by 1. |
| * \param list the list to free |
| * \param unref_devices whether to unref the devices in the list |
| */ |
| void API_EXPORTED libusb_free_device_list(libusb_device **list, |
| int unref_devices) |
| { |
| if (!list) |
| return; |
| |
| if (unref_devices) { |
| int i = 0; |
| struct libusb_device *dev; |
| |
| while ((dev = list[i++]) != NULL) |
| libusb_unref_device(dev); |
| } |
| free(list); |
| } |
| |
| /** \ingroup dev |
| * Get the number of the bus that a device is connected to. |
| * \param dev a device |
| * \returns the bus number |
| */ |
| uint8_t API_EXPORTED libusb_get_bus_number(libusb_device *dev) |
| { |
| return dev->bus_number; |
| } |
| |
| /** \ingroup dev |
| * Get the number of the port that a device is connected to. |
| * Unless the OS does something funky, or you are hot-plugging USB extension cards, |
| * the port number returned by this call is usually guaranteed to be uniquely tied |
| * to a physical port, meaning that different devices plugged on the same physical |
| * port should return the same port number. |
| * |
| * But outside of this, there is no guarantee that the port number returned by this |
| * call will remain the same, or even match the order in which ports have been |
| * numbered by the HUB/HCD manufacturer. |
| * |
| * \param dev a device |
| * \returns the port number (0 if not available) |
| */ |
| uint8_t API_EXPORTED libusb_get_port_number(libusb_device *dev) |
| { |
| return dev->port_number; |
| } |
| |
| /** \ingroup dev |
| * Get the list of all port numbers from root for the specified device |
| * |
| * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102 |
| * \param dev a device |
| * \param port_numbers the array that should contain the port numbers |
| * \param port_numbers_len the maximum length of the array. As per the USB 3.0 |
| * specs, the current maximum limit for the depth is 7. |
| * \returns the number of elements filled |
| * \returns LIBUSB_ERROR_OVERFLOW if the array is too small |
| */ |
| int API_EXPORTED libusb_get_port_numbers(libusb_device *dev, |
| uint8_t* port_numbers, int port_numbers_len) |
| { |
| int i = port_numbers_len; |
| |
| while(dev) { |
| // HCDs can be listed as devices and would have port #0 |
| // TODO: see how the other backends want to implement HCDs as parents |
| if (dev->port_number == 0) |
| break; |
| i--; |
| if (i < 0) { |
| usbi_warn(DEVICE_CTX(dev), |
| "port numbers array too small"); |
| return LIBUSB_ERROR_OVERFLOW; |
| } |
| port_numbers[i] = dev->port_number; |
| dev = dev->parent_dev; |
| } |
| memmove(port_numbers, &port_numbers[i], port_numbers_len - i); |
| return port_numbers_len - i; |
| } |
| |
| /** \ingroup dev |
| * Deprecated please use libusb_get_port_numbers instead. |
| */ |
| int API_EXPORTED libusb_get_port_path(libusb_context *ctx, libusb_device *dev, |
| uint8_t* port_numbers, uint8_t port_numbers_len) |
| { |
| UNUSED(ctx); |
| |
| return libusb_get_port_numbers(dev, port_numbers, port_numbers_len); |
| } |
| |
| /** \ingroup dev |
| * Get the the parent from the specified device. |
| * \param dev a device |
| * \returns the device parent or NULL if not available |
| * You should issue a \ref libusb_get_device_list() before calling this |
| * function and make sure that you only access the parent before issuing |
| * \ref libusb_free_device_list(). The reason is that libusbx currently does |
| * not maintain a permanent list of device instances, and therefore can |
| * only guarantee that parents are fully instantiated within a |
| * libusb_get_device_list() - libusb_free_device_list() block. |
| */ |
| DEFAULT_VISIBILITY |
| libusb_device * LIBUSB_CALL libusb_get_parent(libusb_device *dev) |
| { |
| return dev->parent_dev; |
| } |
| |
| /** \ingroup dev |
| * Get the address of the device on the bus it is connected to. |
| * \param dev a device |
| * \returns the device address |
| */ |
| uint8_t API_EXPORTED libusb_get_device_address(libusb_device *dev) |
| { |
| return dev->device_address; |
| } |
| |
| /** \ingroup dev |
| * Get the negotiated connection speed for a device. |
| * \param dev a device |
| * \returns a \ref libusb_speed code, where LIBUSB_SPEED_UNKNOWN means that |
| * the OS doesn't know or doesn't support returning the negotiated speed. |
| */ |
| int API_EXPORTED libusb_get_device_speed(libusb_device *dev) |
| { |
| return dev->speed; |
| } |
| |
| static const struct libusb_endpoint_descriptor *find_endpoint( |
| struct libusb_config_descriptor *config, unsigned char endpoint) |
| { |
| int iface_idx; |
| for (iface_idx = 0; iface_idx < config->bNumInterfaces; iface_idx++) { |
| const struct libusb_interface *iface = &config->interface[iface_idx]; |
| int altsetting_idx; |
| |
| for (altsetting_idx = 0; altsetting_idx < iface->num_altsetting; |
| altsetting_idx++) { |
| const struct libusb_interface_descriptor *altsetting |
| = &iface->altsetting[altsetting_idx]; |
| int ep_idx; |
| |
| for (ep_idx = 0; ep_idx < altsetting->bNumEndpoints; ep_idx++) { |
| const struct libusb_endpoint_descriptor *ep = |
| &altsetting->endpoint[ep_idx]; |
| if (ep->bEndpointAddress == endpoint) |
| return ep; |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| /** \ingroup dev |
| * Convenience function to retrieve the wMaxPacketSize value for a particular |
| * endpoint in the active device configuration. |
| * |
| * This function was originally intended to be of assistance when setting up |
| * isochronous transfers, but a design mistake resulted in this function |
| * instead. It simply returns the wMaxPacketSize value without considering |
| * its contents. If you're dealing with isochronous transfers, you probably |
| * want libusb_get_max_iso_packet_size() instead. |
| * |
| * \param dev a device |
| * \param endpoint address of the endpoint in question |
| * \returns the wMaxPacketSize value |
| * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist |
| * \returns LIBUSB_ERROR_OTHER on other failure |
| */ |
| int API_EXPORTED libusb_get_max_packet_size(libusb_device *dev, |
| unsigned char endpoint) |
| { |
| struct libusb_config_descriptor *config; |
| const struct libusb_endpoint_descriptor *ep; |
| int r; |
| |
| r = libusb_get_active_config_descriptor(dev, &config); |
| if (r < 0) { |
| usbi_err(DEVICE_CTX(dev), |
| "could not retrieve active config descriptor"); |
| return LIBUSB_ERROR_OTHER; |
| } |
| |
| ep = find_endpoint(config, endpoint); |
| if (!ep) |
| return LIBUSB_ERROR_NOT_FOUND; |
| |
| r = ep->wMaxPacketSize; |
| libusb_free_config_descriptor(config); |
| return r; |
| } |
| |
| /** \ingroup dev |
| * Calculate the maximum packet size which a specific endpoint is capable is |
| * sending or receiving in the duration of 1 microframe |
| * |
| * Only the active configuration is examined. The calculation is based on the |
| * wMaxPacketSize field in the endpoint descriptor as described in section |
| * 9.6.6 in the USB 2.0 specifications. |
| * |
| * If acting on an isochronous or interrupt endpoint, this function will |
| * multiply the value found in bits 0:10 by the number of transactions per |
| * microframe (determined by bits 11:12). Otherwise, this function just |
| * returns the numeric value found in bits 0:10. |
| * |
| * This function is useful for setting up isochronous transfers, for example |
| * you might pass the return value from this function to |
| * libusb_set_iso_packet_lengths() in order to set the length field of every |
| * isochronous packet in a transfer. |
| * |
| * Since v1.0.3. |
| * |
| * \param dev a device |
| * \param endpoint address of the endpoint in question |
| * \returns the maximum packet size which can be sent/received on this endpoint |
| * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist |
| * \returns LIBUSB_ERROR_OTHER on other failure |
| */ |
| int API_EXPORTED libusb_get_max_iso_packet_size(libusb_device *dev, |
| unsigned char endpoint) |
| { |
| struct libusb_config_descriptor *config; |
| const struct libusb_endpoint_descriptor *ep; |
| enum libusb_transfer_type ep_type; |
| uint16_t val; |
| int r; |
| |
| r = libusb_get_active_config_descriptor(dev, &config); |
| if (r < 0) { |
| usbi_err(DEVICE_CTX(dev), |
| "could not retrieve active config descriptor"); |
| return LIBUSB_ERROR_OTHER; |
| } |
| |
| ep = find_endpoint(config, endpoint); |
| if (!ep) |
| return LIBUSB_ERROR_NOT_FOUND; |
| |
| val = ep->wMaxPacketSize; |
| ep_type = (enum libusb_transfer_type) (ep->bmAttributes & 0x3); |
| libusb_free_config_descriptor(config); |
| |
| r = val & 0x07ff; |
| if (ep_type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS |
| || ep_type == LIBUSB_TRANSFER_TYPE_INTERRUPT) |
| r *= (1 + ((val >> 11) & 3)); |
| return r; |
| } |
| |
| /** \ingroup dev |
| * Increment the reference count of a device. |
| * \param dev the device to reference |
| * \returns the same device |
| */ |
| DEFAULT_VISIBILITY |
| libusb_device * LIBUSB_CALL libusb_ref_device(libusb_device *dev) |
| { |
| usbi_mutex_lock(&dev->lock); |
| dev->refcnt++; |
| usbi_mutex_unlock(&dev->lock); |
| return dev; |
| } |
| |
| /** \ingroup dev |
| * Decrement the reference count of a device. If the decrement operation |
| * causes the reference count to reach zero, the device shall be destroyed. |
| * \param dev the device to unreference |
| */ |
| void API_EXPORTED libusb_unref_device(libusb_device *dev) |
| { |
| int refcnt; |
| |
| if (!dev) |
| return; |
| |
| usbi_mutex_lock(&dev->lock); |
| refcnt = --dev->refcnt; |
| usbi_mutex_unlock(&dev->lock); |
| |
| if (refcnt == 0) { |
| usbi_dbg("destroy device %d.%d", dev->bus_number, dev->device_address); |
| |
| libusb_unref_device(dev->parent_dev); |
| |
| if (usbi_backend->destroy_device) |
| usbi_backend->destroy_device(dev); |
| |
| if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) { |
| /* backend does not support hotplug */ |
| usbi_disconnect_device(dev); |
| } |
| |
| usbi_mutex_destroy(&dev->lock); |
| free(dev); |
| } |
| } |
| |
| /* |
| * Interrupt the iteration of the event handling thread, so that it picks |
| * up the new fd. |
| */ |
| void usbi_fd_notification(struct libusb_context *ctx) |
| { |
| unsigned char dummy = 1; |
| ssize_t r; |
| |
| if (ctx == NULL) |
| return; |
| |
| /* record that we are messing with poll fds */ |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify++; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| |
| /* write some data on control pipe to interrupt event handlers */ |
| r = usbi_write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy)); |
| if (r <= 0) { |
| usbi_warn(ctx, "internal signalling write failed"); |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify--; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| return; |
| } |
| |
| /* take event handling lock */ |
| libusb_lock_events(ctx); |
| |
| /* read the dummy data */ |
| r = usbi_read(ctx->ctrl_pipe[0], &dummy, sizeof(dummy)); |
| if (r <= 0) |
| usbi_warn(ctx, "internal signalling read failed"); |
| |
| /* we're done with modifying poll fds */ |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify--; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| |
| /* Release event handling lock and wake up event waiters */ |
| libusb_unlock_events(ctx); |
| } |
| |
| /** \ingroup dev |
| * Open a device and obtain a device handle. A handle allows you to perform |
| * I/O on the device in question. |
| * |
| * Internally, this function adds a reference to the device and makes it |
| * available to you through libusb_get_device(). This reference is removed |
| * during libusb_close(). |
| * |
| * This is a non-blocking function; no requests are sent over the bus. |
| * |
| * \param dev the device to open |
| * \param handle output location for the returned device handle pointer. Only |
| * populated when the return code is 0. |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NO_MEM on memory allocation failure |
| * \returns LIBUSB_ERROR_ACCESS if the user has insufficient permissions |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_open(libusb_device *dev, |
| libusb_device_handle **handle) |
| { |
| struct libusb_context *ctx = DEVICE_CTX(dev); |
| struct libusb_device_handle *_handle; |
| size_t priv_size = usbi_backend->device_handle_priv_size; |
| int r; |
| usbi_dbg("open %d.%d", dev->bus_number, dev->device_address); |
| |
| if (!dev->attached) { |
| return LIBUSB_ERROR_NO_DEVICE; |
| } |
| |
| _handle = malloc(sizeof(*_handle) + priv_size); |
| if (!_handle) |
| return LIBUSB_ERROR_NO_MEM; |
| |
| r = usbi_mutex_init(&_handle->lock, NULL); |
| if (r) { |
| free(_handle); |
| return LIBUSB_ERROR_OTHER; |
| } |
| |
| _handle->dev = libusb_ref_device(dev); |
| _handle->auto_detach_kernel_driver = 0; |
| _handle->claimed_interfaces = 0; |
| memset(&_handle->os_priv, 0, priv_size); |
| |
| r = usbi_backend->open(_handle); |
| if (r < 0) { |
| usbi_dbg("open %d.%d returns %d", dev->bus_number, dev->device_address, r); |
| libusb_unref_device(dev); |
| usbi_mutex_destroy(&_handle->lock); |
| free(_handle); |
| return r; |
| } |
| |
| usbi_mutex_lock(&ctx->open_devs_lock); |
| list_add(&_handle->list, &ctx->open_devs); |
| usbi_mutex_unlock(&ctx->open_devs_lock); |
| *handle = _handle; |
| |
| /* At this point, we want to interrupt any existing event handlers so |
| * that they realise the addition of the new device's poll fd. One |
| * example when this is desirable is if the user is running a separate |
| * dedicated libusbx events handling thread, which is running with a long |
| * or infinite timeout. We want to interrupt that iteration of the loop, |
| * so that it picks up the new fd, and then continues. */ |
| usbi_fd_notification(ctx); |
| |
| return 0; |
| } |
| |
| /** \ingroup dev |
| * Open a device and obtain a device handle. A handle allows you to perform |
| * I/O on the device in question. |
| * |
| * Instead of opening the device itself this function accepts an open file |
| * descriptor that it will take ownership of. |
| * |
| * Internally, this function adds a reference to the device and makes it |
| * available to you through libusb_get_device(). This reference is removed |
| * during libusb_close(). |
| * |
| * This is a non-blocking function; no requests are sent over the bus. |
| * |
| * \param dev the device to open |
| * \param fd open file handle to the device |
| * \param handle output location for the returned device handle pointer. Only |
| * populated when the return code is 0. |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NO_MEM on memory allocation failure |
| * \returns LIBUSB_ERROR_ACCESS if the user has insufficient permissions |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_open_fd(libusb_device *dev, |
| int fd, |
| libusb_device_handle **handle) |
| { |
| struct libusb_context *ctx = DEVICE_CTX(dev); |
| struct libusb_device_handle *_handle; |
| size_t priv_size = usbi_backend->device_handle_priv_size; |
| int r; |
| usbi_dbg("open %d.%d", dev->bus_number, dev->device_address); |
| |
| if (!dev->attached) { |
| return LIBUSB_ERROR_NO_DEVICE; |
| } |
| |
| _handle = malloc(sizeof(*_handle) + priv_size); |
| if (!_handle) |
| return LIBUSB_ERROR_NO_MEM; |
| |
| r = usbi_mutex_init(&_handle->lock, NULL); |
| if (r) { |
| free(_handle); |
| return LIBUSB_ERROR_OTHER; |
| } |
| |
| _handle->dev = libusb_ref_device(dev); |
| _handle->auto_detach_kernel_driver = 0; |
| _handle->claimed_interfaces = 0; |
| memset(&_handle->os_priv, 0, priv_size); |
| |
| r = usbi_backend->open_fd(_handle, fd); |
| if (r < 0) { |
| usbi_dbg("open %d.%d returns %d", dev->bus_number, dev->device_address, r); |
| libusb_unref_device(dev); |
| usbi_mutex_destroy(&_handle->lock); |
| free(_handle); |
| return r; |
| } |
| |
| usbi_mutex_lock(&ctx->open_devs_lock); |
| list_add(&_handle->list, &ctx->open_devs); |
| usbi_mutex_unlock(&ctx->open_devs_lock); |
| *handle = _handle; |
| |
| /* At this point, we want to interrupt any existing event handlers so |
| * that they realise the addition of the new device's poll fd. One |
| * example when this is desirable is if the user is running a separate |
| * dedicated libusbx events handling thread, which is running with a long |
| * or infinite timeout. We want to interrupt that iteration of the loop, |
| * so that it picks up the new fd, and then continues. */ |
| usbi_fd_notification(ctx); |
| |
| return 0; |
| } |
| |
| /** \ingroup dev |
| * Convenience function for finding a device with a particular |
| * <tt>idVendor</tt>/<tt>idProduct</tt> combination. This function is intended |
| * for those scenarios where you are using libusbx to knock up a quick test |
| * application - it allows you to avoid calling libusb_get_device_list() and |
| * worrying about traversing/freeing the list. |
| * |
| * This function has limitations and is hence not intended for use in real |
| * applications: if multiple devices have the same IDs it will only |
| * give you the first one, etc. |
| * |
| * \param ctx the context to operate on, or NULL for the default context |
| * \param vendor_id the idVendor value to search for |
| * \param product_id the idProduct value to search for |
| * \returns a handle for the first found device, or NULL on error or if the |
| * device could not be found. */ |
| DEFAULT_VISIBILITY |
| libusb_device_handle * LIBUSB_CALL libusb_open_device_with_vid_pid( |
| libusb_context *ctx, uint16_t vendor_id, uint16_t product_id) |
| { |
| struct libusb_device **devs; |
| struct libusb_device *found = NULL; |
| struct libusb_device *dev; |
| struct libusb_device_handle *handle = NULL; |
| size_t i = 0; |
| int r; |
| |
| if (libusb_get_device_list(ctx, &devs) < 0) |
| return NULL; |
| |
| while ((dev = devs[i++]) != NULL) { |
| struct libusb_device_descriptor desc; |
| r = libusb_get_device_descriptor(dev, &desc); |
| if (r < 0) |
| goto out; |
| if (desc.idVendor == vendor_id && desc.idProduct == product_id) { |
| found = dev; |
| break; |
| } |
| } |
| |
| if (found) { |
| r = libusb_open(found, &handle); |
| if (r < 0) |
| handle = NULL; |
| } |
| |
| out: |
| libusb_free_device_list(devs, 1); |
| return handle; |
| } |
| |
| static void do_close(struct libusb_context *ctx, |
| struct libusb_device_handle *dev_handle) |
| { |
| struct usbi_transfer *itransfer; |
| struct usbi_transfer *tmp; |
| |
| libusb_lock_events(ctx); |
| |
| /* remove any transfers in flight that are for this device */ |
| usbi_mutex_lock(&ctx->flying_transfers_lock); |
| |
| /* safe iteration because transfers may be being deleted */ |
| list_for_each_entry_safe(itransfer, tmp, &ctx->flying_transfers, list, struct usbi_transfer) { |
| struct libusb_transfer *transfer = |
| USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); |
| |
| if (transfer->dev_handle != dev_handle) |
| continue; |
| |
| if (!(itransfer->flags & USBI_TRANSFER_DEVICE_DISAPPEARED)) { |
| usbi_err(ctx, "Device handle closed while transfer was still being processed, but the device is still connected as far as we know"); |
| |
| if (itransfer->flags & USBI_TRANSFER_CANCELLING) |
| usbi_warn(ctx, "A cancellation for an in-flight transfer hasn't completed but closing the device handle"); |
| else |
| usbi_err(ctx, "A cancellation hasn't even been scheduled on the transfer for which the device is closing"); |
| } |
| |
| /* remove from the list of in-flight transfers and make sure |
| * we don't accidentally use the device handle in the future |
| * (or that such accesses will be easily caught and identified as a crash) |
| */ |
| usbi_mutex_lock(&itransfer->lock); |
| list_del(&itransfer->list); |
| transfer->dev_handle = NULL; |
| usbi_mutex_unlock(&itransfer->lock); |
| |
| /* it is up to the user to free up the actual transfer struct. this is |
| * just making sure that we don't attempt to process the transfer after |
| * the device handle is invalid |
| */ |
| usbi_dbg("Removed transfer %p from the in-flight list because device handle %p closed", |
| transfer, dev_handle); |
| } |
| usbi_mutex_unlock(&ctx->flying_transfers_lock); |
| |
| libusb_unlock_events(ctx); |
| |
| usbi_mutex_lock(&ctx->open_devs_lock); |
| list_del(&dev_handle->list); |
| usbi_mutex_unlock(&ctx->open_devs_lock); |
| |
| usbi_backend->close(dev_handle); |
| libusb_unref_device(dev_handle->dev); |
| usbi_mutex_destroy(&dev_handle->lock); |
| free(dev_handle); |
| } |
| |
| /** \ingroup dev |
| * Close a device handle. Should be called on all open handles before your |
| * application exits. |
| * |
| * Internally, this function destroys the reference that was added by |
| * libusb_open() on the given device. |
| * |
| * This is a non-blocking function; no requests are sent over the bus. |
| * |
| * \param dev_handle the handle to close |
| */ |
| void API_EXPORTED libusb_close(libusb_device_handle *dev_handle) |
| { |
| struct libusb_context *ctx; |
| unsigned char dummy = 1; |
| ssize_t r; |
| |
| if (!dev_handle) |
| return; |
| usbi_dbg(""); |
| |
| ctx = HANDLE_CTX(dev_handle); |
| |
| /* Similarly to libusb_open(), we want to interrupt all event handlers |
| * at this point. More importantly, we want to perform the actual close of |
| * the device while holding the event handling lock (preventing any other |
| * thread from doing event handling) because we will be removing a file |
| * descriptor from the polling loop. */ |
| |
| /* record that we are messing with poll fds */ |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify++; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| |
| /* write some data on control pipe to interrupt event handlers */ |
| r = usbi_write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy)); |
| if (r <= 0) { |
| usbi_warn(ctx, "internal signalling write failed, closing anyway"); |
| do_close(ctx, dev_handle); |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify--; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| return; |
| } |
| |
| /* take event handling lock */ |
| libusb_lock_events(ctx); |
| |
| /* read the dummy data */ |
| r = usbi_read(ctx->ctrl_pipe[0], &dummy, sizeof(dummy)); |
| if (r <= 0) |
| usbi_warn(ctx, "internal signalling read failed, closing anyway"); |
| |
| /* Close the device */ |
| do_close(ctx, dev_handle); |
| |
| /* we're done with modifying poll fds */ |
| usbi_mutex_lock(&ctx->pollfd_modify_lock); |
| ctx->pollfd_modify--; |
| usbi_mutex_unlock(&ctx->pollfd_modify_lock); |
| |
| /* Release event handling lock and wake up event waiters */ |
| libusb_unlock_events(ctx); |
| } |
| |
| /** \ingroup dev |
| * Get the underlying device for a handle. This function does not modify |
| * the reference count of the returned device, so do not feel compelled to |
| * unreference it when you are done. |
| * \param dev_handle a device handle |
| * \returns the underlying device |
| */ |
| DEFAULT_VISIBILITY |
| libusb_device * LIBUSB_CALL libusb_get_device(libusb_device_handle *dev_handle) |
| { |
| return dev_handle->dev; |
| } |
| |
| /** \ingroup dev |
| * Determine the bConfigurationValue of the currently active configuration. |
| * |
| * You could formulate your own control request to obtain this information, |
| * but this function has the advantage that it may be able to retrieve the |
| * information from operating system caches (no I/O involved). |
| * |
| * If the OS does not cache this information, then this function will block |
| * while a control transfer is submitted to retrieve the information. |
| * |
| * This function will return a value of 0 in the <tt>config</tt> output |
| * parameter if the device is in unconfigured state. |
| * |
| * \param dev a device handle |
| * \param config output location for the bConfigurationValue of the active |
| * configuration (only valid for return code 0) |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_get_configuration(libusb_device_handle *dev, |
| int *config) |
| { |
| int r = LIBUSB_ERROR_NOT_SUPPORTED; |
| |
| usbi_dbg(""); |
| if (usbi_backend->get_configuration) |
| r = usbi_backend->get_configuration(dev, config); |
| |
| if (r == LIBUSB_ERROR_NOT_SUPPORTED) { |
| uint8_t tmp = 0; |
| usbi_dbg("falling back to control message"); |
| r = libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN, |
| LIBUSB_REQUEST_GET_CONFIGURATION, 0, 0, &tmp, 1, 1000); |
| if (r == 0) { |
| usbi_err(HANDLE_CTX(dev), "zero bytes returned in ctrl transfer?"); |
| r = LIBUSB_ERROR_IO; |
| } else if (r == 1) { |
| r = 0; |
| *config = tmp; |
| } else { |
| usbi_dbg("control failed, error %d", r); |
| } |
| } |
| |
| if (r == 0) |
| usbi_dbg("active config %d", *config); |
| |
| return r; |
| } |
| |
| /** \ingroup dev |
| * Set the active configuration for a device. |
| * |
| * The operating system may or may not have already set an active |
| * configuration on the device. It is up to your application to ensure the |
| * correct configuration is selected before you attempt to claim interfaces |
| * and perform other operations. |
| * |
| * If you call this function on a device already configured with the selected |
| * configuration, then this function will act as a lightweight device reset: |
| * it will issue a SET_CONFIGURATION request using the current configuration, |
| * causing most USB-related device state to be reset (altsetting reset to zero, |
| * endpoint halts cleared, toggles reset). |
| * |
| * You cannot change/reset configuration if your application has claimed |
| * interfaces. It is advised to set the desired configuration before claiming |
| * interfaces. |
| * |
| * Alternatively you can call libusb_release_interface() first. Note if you |
| * do things this way you must ensure that auto_detach_kernel_driver for |
| * <tt>dev</tt> is 0, otherwise the kernel driver will be re-attached when you |
| * release the interface(s). |
| * |
| * You cannot change/reset configuration if other applications or drivers have |
| * claimed interfaces. |
| * |
| * A configuration value of -1 will put the device in unconfigured state. |
| * The USB specifications state that a configuration value of 0 does this, |
| * however buggy devices exist which actually have a configuration 0. |
| * |
| * You should always use this function rather than formulating your own |
| * SET_CONFIGURATION control request. This is because the underlying operating |
| * system needs to know when such changes happen. |
| * |
| * This is a blocking function. |
| * |
| * \param dev a device handle |
| * \param configuration the bConfigurationValue of the configuration you |
| * wish to activate, or -1 if you wish to put the device in unconfigured state |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if the requested configuration does not exist |
| * \returns LIBUSB_ERROR_BUSY if interfaces are currently claimed |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| * \see libusb_set_auto_detach_kernel_driver() |
| */ |
| int API_EXPORTED libusb_set_configuration(libusb_device_handle *dev, |
| int configuration) |
| { |
| usbi_dbg("configuration %d", configuration); |
| return usbi_backend->set_configuration(dev, configuration); |
| } |
| |
| /** \ingroup dev |
| * Claim an interface on a given device handle. You must claim the interface |
| * you wish to use before you can perform I/O on any of its endpoints. |
| * |
| * It is legal to attempt to claim an already-claimed interface, in which |
| * case libusbx just returns 0 without doing anything. |
| * |
| * If auto_detach_kernel_driver is set to 1 for <tt>dev</tt>, the kernel driver |
| * will be detached if necessary, on failure the detach error is returned. |
| * |
| * Claiming of interfaces is a purely logical operation; it does not cause |
| * any requests to be sent over the bus. Interface claiming is used to |
| * instruct the underlying operating system that your application wishes |
| * to take ownership of the interface. |
| * |
| * This is a non-blocking function. |
| * |
| * \param dev a device handle |
| * \param interface_number the <tt>bInterfaceNumber</tt> of the interface you |
| * wish to claim |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if the requested interface does not exist |
| * \returns LIBUSB_ERROR_BUSY if another program or driver has claimed the |
| * interface |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns a LIBUSB_ERROR code on other failure |
| * \see libusb_set_auto_detach_kernel_driver() |
| */ |
| int API_EXPORTED libusb_claim_interface(libusb_device_handle *dev, |
| int interface_number) |
| { |
| int r = 0; |
| |
| usbi_dbg("interface %d", interface_number); |
| if (interface_number >= USB_MAXINTERFACES) |
| return LIBUSB_ERROR_INVALID_PARAM; |
| |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| usbi_mutex_lock(&dev->lock); |
| if (dev->claimed_interfaces & (1 << interface_number)) |
| goto out; |
| |
| r = usbi_backend->claim_interface(dev, interface_number); |
| if (r == 0) |
| dev->claimed_interfaces |= 1 << interface_number; |
| |
| out: |
| usbi_mutex_unlock(&dev->lock); |
| return r; |
| } |
| |
| /** \ingroup dev |
| * Release an interface previously claimed with libusb_claim_interface(). You |
| * should release all claimed interfaces before closing a device handle. |
| * |
| * This is a blocking function. A SET_INTERFACE control request will be sent |
| * to the device, resetting interface state to the first alternate setting. |
| * |
| * If auto_detach_kernel_driver is set to 1 for <tt>dev</tt>, the kernel |
| * driver will be re-attached after releasing the interface. |
| * |
| * \param dev a device handle |
| * \param interface_number the <tt>bInterfaceNumber</tt> of the |
| * previously-claimed interface |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if the interface was not claimed |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| * \see libusb_set_auto_detach_kernel_driver() |
| */ |
| int API_EXPORTED libusb_release_interface(libusb_device_handle *dev, |
| int interface_number) |
| { |
| int r; |
| |
| usbi_dbg("interface %d", interface_number); |
| if (interface_number >= USB_MAXINTERFACES) |
| return LIBUSB_ERROR_INVALID_PARAM; |
| |
| usbi_mutex_lock(&dev->lock); |
| if (!(dev->claimed_interfaces & (1 << interface_number))) { |
| r = LIBUSB_ERROR_NOT_FOUND; |
| goto out; |
| } |
| |
| r = usbi_backend->release_interface(dev, interface_number); |
| if (r == 0) |
| dev->claimed_interfaces &= ~(1 << interface_number); |
| |
| out: |
| usbi_mutex_unlock(&dev->lock); |
| return r; |
| } |
| |
| /** \ingroup dev |
| * Activate an alternate setting for an interface. The interface must have |
| * been previously claimed with libusb_claim_interface(). |
| * |
| * You should always use this function rather than formulating your own |
| * SET_INTERFACE control request. This is because the underlying operating |
| * system needs to know when such changes happen. |
| * |
| * This is a blocking function. |
| * |
| * \param dev a device handle |
| * \param interface_number the <tt>bInterfaceNumber</tt> of the |
| * previously-claimed interface |
| * \param alternate_setting the <tt>bAlternateSetting</tt> of the alternate |
| * setting to activate |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if the interface was not claimed, or the |
| * requested alternate setting does not exist |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_set_interface_alt_setting(libusb_device_handle *dev, |
| int interface_number, int alternate_setting) |
| { |
| usbi_dbg("interface %d altsetting %d", |
| interface_number, alternate_setting); |
| if (interface_number >= USB_MAXINTERFACES) |
| return LIBUSB_ERROR_INVALID_PARAM; |
| |
| usbi_mutex_lock(&dev->lock); |
| if (!dev->dev->attached) { |
| usbi_mutex_unlock(&dev->lock); |
| return LIBUSB_ERROR_NO_DEVICE; |
| } |
| |
| if (!(dev->claimed_interfaces & (1 << interface_number))) { |
| usbi_mutex_unlock(&dev->lock); |
| return LIBUSB_ERROR_NOT_FOUND; |
| } |
| usbi_mutex_unlock(&dev->lock); |
| |
| return usbi_backend->set_interface_altsetting(dev, interface_number, |
| alternate_setting); |
| } |
| |
| /** \ingroup dev |
| * Clear the halt/stall condition for an endpoint. Endpoints with halt status |
| * are unable to receive or transmit data until the halt condition is stalled. |
| * |
| * You should cancel all pending transfers before attempting to clear the halt |
| * condition. |
| * |
| * This is a blocking function. |
| * |
| * \param dev a device handle |
| * \param endpoint the endpoint to clear halt status |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_clear_halt(libusb_device_handle *dev, |
| unsigned char endpoint) |
| { |
| usbi_dbg("endpoint %x", endpoint); |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| return usbi_backend->clear_halt(dev, endpoint); |
| } |
| |
| /** \ingroup dev |
| * Perform a USB port reset to reinitialize a device. The system will attempt |
| * to restore the previous configuration and alternate settings after the |
| * reset has completed. |
| * |
| * If the reset fails, the descriptors change, or the previous state cannot be |
| * restored, the device will appear to be disconnected and reconnected. This |
| * means that the device handle is no longer valid (you should close it) and |
| * rediscover the device. A return code of LIBUSB_ERROR_NOT_FOUND indicates |
| * when this is the case. |
| * |
| * This is a blocking function which usually incurs a noticeable delay. |
| * |
| * \param dev a handle of the device to reset |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if re-enumeration is required, or if the |
| * device has been disconnected |
| * \returns another LIBUSB_ERROR code on other failure |
| */ |
| int API_EXPORTED libusb_reset_device(libusb_device_handle *dev) |
| { |
| usbi_dbg(""); |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| return usbi_backend->reset_device(dev); |
| } |
| |
| /** \ingroup dev |
| * Determine if a kernel driver is active on an interface. If a kernel driver |
| * is active, you cannot claim the interface, and libusbx will be unable to |
| * perform I/O. |
| * |
| * This functionality is not available on Windows. |
| * |
| * \param dev a device handle |
| * \param interface_number the interface to check |
| * \returns 0 if no kernel driver is active |
| * \returns 1 if a kernel driver is active |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality |
| * is not available |
| * \returns another LIBUSB_ERROR code on other failure |
| * \see libusb_detach_kernel_driver() |
| */ |
| int API_EXPORTED libusb_kernel_driver_active(libusb_device_handle *dev, |
| int interface_number) |
| { |
| usbi_dbg("interface %d", interface_number); |
| |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| if (usbi_backend->kernel_driver_active) |
| return usbi_backend->kernel_driver_active(dev, interface_number); |
| else |
| return LIBUSB_ERROR_NOT_SUPPORTED; |
| } |
| |
| /** \ingroup dev |
| * Detach a kernel driver from an interface. If successful, you will then be |
| * able to claim the interface and perform I/O. |
| * |
| * This functionality is not available on Darwin or Windows. |
| * |
| * Note that libusbx itself also talks to the device through a special kernel |
| * driver, if this driver is already attached to the device, this call will |
| * not detach it and return LIBUSB_ERROR_NOT_FOUND. |
| * |
| * \param dev a device handle |
| * \param interface_number the interface to detach the driver from |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if no kernel driver was active |
| * \returns LIBUSB_ERROR_INVALID_PARAM if the interface does not exist |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality |
| * is not available |
| * \returns another LIBUSB_ERROR code on other failure |
| * \see libusb_kernel_driver_active() |
| */ |
| int API_EXPORTED libusb_detach_kernel_driver(libusb_device_handle *dev, |
| int interface_number) |
| { |
| usbi_dbg("interface %d", interface_number); |
| |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| if (usbi_backend->detach_kernel_driver) |
| return usbi_backend->detach_kernel_driver(dev, interface_number); |
| else |
| return LIBUSB_ERROR_NOT_SUPPORTED; |
| } |
| |
| /** \ingroup dev |
| * Re-attach an interface's kernel driver, which was previously detached |
| * using libusb_detach_kernel_driver(). This call is only effective on |
| * Linux and returns LIBUSB_ERROR_NOT_SUPPORTED on all other platforms. |
| * |
| * This functionality is not available on Darwin or Windows. |
| * |
| * \param dev a device handle |
| * \param interface_number the interface to attach the driver from |
| * \returns 0 on success |
| * \returns LIBUSB_ERROR_NOT_FOUND if no kernel driver was active |
| * \returns LIBUSB_ERROR_INVALID_PARAM if the interface does not exist |
| * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected |
| * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality |
| * is not available |
| * \returns LIBUSB_ERROR_BUSY if the driver cannot be attached because the |
| * interface is claimed by a program or driver |
| * \returns another LIBUSB_ERROR code on other failure |
| * \see libusb_kernel_driver_active() |
| */ |
| int API_EXPORTED libusb_attach_kernel_driver(libusb_device_handle *dev, |
| int interface_number) |
| { |
| usbi_dbg("interface %d", interface_number); |
| |
| if (!dev->dev->attached) |
| return LIBUSB_ERROR_NO_DEVICE; |
| |
| if (usbi_backend->attach_kernel_driver) |
| return usbi_backend->attach_kernel_driver(dev, interface_number); |
| else |
| return LIBUSB_ERROR_NOT_SUPPORTED; |
| } |
| |
| /** \ingroup dev |
| * Enable/disable libusbx's automatic kernel driver detachment. When this is |
| * enabled libusbx will automatically detach the kernel driver on an interface |
| * when claiming the interface, and attach it when releasing the interface. |
| * |
| * Automatic kernel driver detachment is disabled on newly opened device |
| * handles by default. |
| * |
| * On platforms which do not have LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER |
| * this function will return LIBUSB_ERROR_NOT_SUPPORTED, and libusbx will |
| * continue as if this function was never called. |
| * |
| * \param dev a device handle |
| * \param enable whether to enable or disable auto kernel driver detachment |
| * |
| * \returns LIBUSB_SUCCESS on success |
| * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality |
| * is not available |
| * \see libusb_claim_interface() |
| * \see libusb_release_interface() |
| * \see libusb_set_configuration() |
| */ |
| int API_EXPORTED libusb_set_auto_detach_kernel_driver( |
| libusb_device_handle *dev, int enable) |
| { |
| if (!(usbi_backend->caps & USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) |
| return LIBUSB_ERROR_NOT_SUPPORTED; |
| |
| dev->auto_detach_kernel_driver = enable; |
| return LIBUSB_SUCCESS; |
| } |
| |
| /** \ingroup lib |
| * Set log message verbosity. |
| * |
| * The default level is LIBUSB_LOG_LEVEL_NONE, which means no messages are ever |
| * printed. If you choose to increase the message verbosity level, ensure |
| * that your application does not close the stdout/stderr file descriptors. |
| * |
| * You are advised to use level LIBUSB_LOG_LEVEL_WARNING. libusbx is conservative |
| * with its message logging and most of the time, will only log messages that |
| * explain error conditions and other oddities. This will help you debug |
| * your software. |
| * |
| * If the LIBUSB_DEBUG environment variable was set when libusbx was |
| * initialized, this function does nothing: the message verbosity is fixed |
| * to the value in the environment variable. |
| * |
| * If libusbx was compiled without any message logging, this function does |
| * nothing: you'll never get any messages. |
| * |
| * If libusbx was compiled with verbose debug message logging, this function |
| * does nothing: you'll always get messages from all levels. |
| * |
| * \param ctx the context to operate on, or NULL for the default context |
| * \param level debug level to set |
| */ |
| void API_EXPORTED libusb_set_debug(libusb_context *ctx, int level) |
| { |
| USBI_GET_CONTEXT(ctx); |
| if (!ctx->debug_fixed) |
| ctx->debug = level; |
| } |
| |
| /** \ingroup lib |
| * Initialize libusb. This function must be called before calling any other |
| * libusbx function. |
| * |
| * If you do not provide an output location for a context pointer, a default |
| * context will be created. If there was already a default context, it will |
| * be reused (and nothing will be initialized/reinitialized). |
| * |
| * \param context Optional output location for context pointer. |
| * Only valid on return code 0. |
| * \returns 0 on success, or a LIBUSB_ERROR code on failure |
| * \see contexts |
| */ |
| int API_EXPORTED libusb_init(libusb_context **context) |
| { |
| struct libusb_device *dev, *next; |
| char *dbg = getenv("LIBUSB_DEBUG"); |
| struct libusb_context *ctx; |
| static int first_init = 1; |
| int r = 0; |
| |
| usbi_mutex_static_lock(&default_context_lock); |
| |
| if (!timestamp_origin.tv_sec) { |
| usbi_gettimeofday(×tamp_origin, NULL); |
| } |
| |
| if (!context && usbi_default_context) { |
| usbi_dbg("reusing default context"); |
| default_context_refcnt++; |
| usbi_mutex_static_unlock(&default_context_lock); |
| return 0; |
| } |
| |
| ctx = calloc(1, sizeof(*ctx)); |
| if (!ctx) { |
| r = LIBUSB_ERROR_NO_MEM; |
| goto err_unlock; |
| } |
| |
| #ifdef ENABLE_DEBUG_LOGGING |
| ctx->debug = LIBUSB_LOG_LEVEL_DEBUG; |
| #endif |
| |
| if (dbg) { |
| ctx->debug = atoi(dbg); |
| if (ctx->debug) |
| ctx->debug_fixed = 1; |
| } |
| |
| /* default context should be initialized before calling usbi_dbg */ |
| if (!usbi_default_context) { |
| usbi_default_context = ctx; |
| default_context_refcnt++; |
| usbi_dbg("created default context"); |
| } |
| |
| usbi_dbg("libusbx v%d.%d.%d.%d", libusb_version_internal.major, libusb_version_internal.minor, |
| libusb_version_internal.micro, libusb_version_internal.nano); |
| |
| usbi_mutex_init(&ctx->usb_devs_lock, NULL); |
| usbi_mutex_init(&ctx->open_devs_lock, NULL); |
| usbi_mutex_init(&ctx->hotplug_cbs_lock, NULL); |
| list_init(&ctx->usb_devs); |
| list_init(&ctx->open_devs); |
| list_init(&ctx->hotplug_cbs); |
| |
| usbi_mutex_static_lock(&active_contexts_lock); |
| if (first_init) { |
| first_init = 0; |
| list_init (&active_contexts_list); |
| } |
| list_add (&ctx->list, &active_contexts_list); |
| usbi_mutex_static_unlock(&active_contexts_lock); |
| |
| if (usbi_backend->init) { |
| r = usbi_backend->init(ctx); |
| if (r) |
| goto err_free_ctx; |
| } |
| |
| r = usbi_io_init(ctx); |
| if (r < 0) |
| goto err_backend_exit; |
| |
| usbi_mutex_static_unlock(&default_context_lock); |
| |
| if (context) |
| *context = ctx; |
| |
| return 0; |
| |
| err_backend_exit: |
| if (usbi_backend->exit) |
| usbi_backend->exit(); |
| err_free_ctx: |
| if (ctx == usbi_default_context) |
| usbi_default_context = NULL; |
| |
| usbi_mutex_static_lock(&active_contexts_lock); |
| list_del (&ctx->list); |
| usbi_mutex_static_unlock(&active_contexts_lock); |
| |
| usbi_mutex_lock(&ctx->usb_devs_lock); |
| list_for_each_entry_safe(dev, next, &ctx->usb_devs, list, struct libusb_device) { |
| list_del(&dev->list); |
| libusb_unref_device(dev); |
| } |
| usbi_mutex_unlock(&ctx->usb_devs_lock); |
| |
| usbi_mutex_destroy(&ctx->open_devs_lock); |
| usbi_mutex_destroy(&ctx->usb_devs_lock); |
| usbi_mutex_destroy(&ctx->hotplug_cbs_lock); |
| |
| free(ctx); |
| err_unlock: |
| usbi_mutex_static_unlock(&default_context_lock); |
| return r; |
| } |
| |
| /** \ingroup lib |
| * Deinitialize libusb. Should be called after closing all open devices and |
| * before your application terminates. |
| * \param ctx the context to deinitialize, or NULL for the default context |
| */ |
| void API_EXPORTED libusb_exit(struct libusb_context *ctx) |
| { |
| struct libusb_device *dev, *next; |
| |
| usbi_dbg(""); |
| USBI_GET_CONTEXT(ctx); |
| |
| /* if working with default context, only actually do the deinitialization |
| * if we're the last user */ |
| usbi_mutex_static_lock(&default_context_lock); |
| if (ctx == usbi_default_context) { |
| if (--default_context_refcnt > 0) { |
| usbi_dbg("not destroying default context"); |
| usbi_mutex_static_unlock(&default_context_lock); |
| return; |
| } |
| usbi_dbg("destroying default context"); |
| usbi_default_context = NULL; |
| } |
| usbi_mutex_static_unlock(&default_context_lock); |
| |
| usbi_mutex_static_lock(&active_contexts_lock); |
| list_del (&ctx->list); |
| usbi_mutex_static_unlock(&active_contexts_lock); |
| |
| if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) { |
| usbi_hotplug_deregister_all(ctx); |
| usbi_mutex_lock(&ctx->usb_devs_lock); |
| list_for_each_entry_safe(dev, next, &ctx->usb_devs, list, struct libusb_device) { |
| list_del(&dev->list); |
| libusb_unref_device(dev); |
| } |
| usbi_mutex_unlock(&ctx->usb_devs_lock); |
| } |
| |
| /* a few sanity checks. don't bother with locking because unless |
| * there is an application bug, nobody will be accessing these. */ |
| if (!list_empty(&ctx->usb_devs)) |
| usbi_warn(ctx, "some libusb_devices were leaked"); |
| if (!list_empty(&ctx->open_devs)) |
| usbi_warn(ctx, "application left some devices open"); |
| |
| usbi_io_exit(ctx); |
| if (usbi_backend->exit) |
| usbi_backend->exit(); |
| |
| usbi_mutex_destroy(&ctx->open_devs_lock); |
| usbi_mutex_destroy(&ctx->usb_devs_lock); |
| usbi_mutex_destroy(&ctx->hotplug_cbs_lock); |
| free(ctx); |
| } |
| |
| /** \ingroup misc |
| * Check at runtime if the loaded library has a given capability. |
| * This call should be performed after \ref libusb_init(), to ensure the |
| * backend has updated its capability set. |
| * |
| * \param capability the \ref libusb_capability to check for |
| * \returns nonzero if the running library has the capability, 0 otherwise |
| */ |
| int API_EXPORTED libusb_has_capability(uint32_t capability) |
| { |
| switch (capability) { |
| case LIBUSB_CAP_HAS_CAPABILITY: |
| return 1; |
| case LIBUSB_CAP_HAS_HOTPLUG: |
| return !(usbi_backend->get_device_list); |
| case LIBUSB_CAP_HAS_HID_ACCESS: |
| return (usbi_backend->caps & USBI_CAP_HAS_HID_ACCESS); |
| case LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER: |
| return (usbi_backend->caps & USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER); |
| } |
| return 0; |
| } |
| |
| /* this is defined in libusbi.h if needed */ |
| #ifdef LIBUSB_GETTIMEOFDAY_WIN32 |
| /* |
| * gettimeofday |
| * Implementation according to: |
| * The Open Group Base Specifications Issue 6 |
| * IEEE Std 1003.1, 2004 Edition |
| */ |
| |
| /* |
| * THIS SOFTWARE IS NOT COPYRIGHTED |
| * |
| * This source code is offered for use in the public domain. You may |
| * use, modify or distribute it freely. |
| * |
| * This code is distributed in the hope that it will be useful but |
| * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY |
| * DISCLAIMED. This includes but is not limited to warranties of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Contributed by: |
| * Danny Smith <dannysmith@users.sourceforge.net> |
| */ |
| |
| /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */ |
| #define _W32_FT_OFFSET (116444736000000000) |
| |
| int usbi_gettimeofday(struct timeval *tp, void *tzp) |
| { |
| union { |
| unsigned __int64 ns100; /* Time since 1 Jan 1601, in 100ns units */ |
| FILETIME ft; |
| } _now; |
| UNUSED(tzp); |
| |
| if(tp) { |
| #if defined(OS_WINCE) |
| SYSTEMTIME st; |
| GetSystemTime(&st); |
| SystemTimeToFileTime(&st, &_now.ft); |
| #else |
| GetSystemTimeAsFileTime (&_now.ft); |
| #endif |
| tp->tv_usec=(long)((_now.ns100 / 10) % 1000000 ); |
| tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000); |
| } |
| /* Always return 0 as per Open Group Base Specifications Issue 6. |
| Do not set errno on error. */ |
| return 0; |
| } |
| #endif |
| |
| static void usbi_log_str(struct libusb_context *ctx, |
| enum libusb_log_level level, const char * str) |
| { |
| #if defined(USE_SYSTEM_LOGGING_FACILITY) |
| #if defined(OS_WINDOWS) || defined(OS_WINCE) |
| /* Windows CE only supports the Unicode version of OutputDebugString. */ |
| WCHAR wbuf[USBI_MAX_LOG_LEN]; |
| MultiByteToWideChar(CP_UTF8, 0, str, -1, wbuf, sizeof(wbuf)); |
| OutputDebugStringW(wbuf); |
| #elif defined(__ANDROID__) |
| int priority = ANDROID_LOG_UNKNOWN; |
| switch (level) { |
| case LIBUSB_LOG_LEVEL_INFO: priority = ANDROID_LOG_INFO; break; |
| case LIBUSB_LOG_LEVEL_WARNING: priority = ANDROID_LOG_WARN; break; |
| case LIBUSB_LOG_LEVEL_ERROR: priority = ANDROID_LOG_ERROR; break; |
| case LIBUSB_LOG_LEVEL_DEBUG: priority = ANDROID_LOG_DEBUG; break; |
| } |
| __android_log_write(priority, "libusb", str); |
| #elif defined(HAVE_SYSLOG_FUNC) |
| int syslog_level = LOG_INFO; |
| switch (level) { |
| case LIBUSB_LOG_LEVEL_INFO: syslog_level = LOG_INFO; break; |
| case LIBUSB_LOG_LEVEL_WARNING: syslog_level = LOG_WARNING; break; |
| case LIBUSB_LOG_LEVEL_ERROR: syslog_level = LOG_ERR; break; |
| case LIBUSB_LOG_LEVEL_DEBUG: syslog_level = LOG_DEBUG; break; |
| } |
| syslog(syslog_level, "%s", str); |
| #else /* All of gcc, Clang, XCode seem to use #warning */ |
| #warning System logging is not supported on this platform. Logging to stderr will be used instead. |
| fputs(str, stderr); |
| #endif |
| #else |
| fputs(str, stderr); |
| #endif /* USE_SYSTEM_LOGGING_FACILITY */ |
| UNUSED(ctx); |
| UNUSED(level); |
| } |
| |
| void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level, |
| const char *function, const char *format, va_list args) |
| { |
| const char *prefix = ""; |
| char buf[USBI_MAX_LOG_LEN]; |
| struct timeval now; |
| int global_debug, header_len, text_len; |
| static int has_debug_header_been_displayed = 0; |
| |
| #ifdef ENABLE_DEBUG_LOGGING |
| global_debug = 1; |
| UNUSED(ctx); |
| #else |
| USBI_GET_CONTEXT(ctx); |
| if (ctx == NULL) |
| return; |
| global_debug = (ctx->debug == LIBUSB_LOG_LEVEL_DEBUG); |
| if (!ctx->debug) |
| return; |
| if (level == LIBUSB_LOG_LEVEL_WARNING && ctx->debug < LIBUSB_LOG_LEVEL_WARNING) |
| return; |
| if (level == LIBUSB_LOG_LEVEL_INFO && ctx->debug < LIBUSB_LOG_LEVEL_INFO) |
| return; |
| if (level == LIBUSB_LOG_LEVEL_DEBUG && ctx->debug < LIBUSB_LOG_LEVEL_DEBUG) |
| return; |
| #endif |
| |
| usbi_gettimeofday(&now, NULL); |
| if ((global_debug) && (!has_debug_header_been_displayed)) { |
| has_debug_header_been_displayed = 1; |
| usbi_log_str(ctx, LIBUSB_LOG_LEVEL_DEBUG, "[timestamp] [threadID] facility level [function call] <message>\n"); |
| usbi_log_str(ctx, LIBUSB_LOG_LEVEL_DEBUG, "--------------------------------------------------------------------------------\n"); |
| } |
| if (now.tv_usec < timestamp_origin.tv_usec) { |
| now.tv_sec--; |
| now.tv_usec += 1000000; |
| } |
| now.tv_sec -= timestamp_origin.tv_sec; |
| now.tv_usec -= timestamp_origin.tv_usec; |
| |
| switch (level) { |
| case LIBUSB_LOG_LEVEL_INFO: |
| prefix = "info"; |
| break; |
| case LIBUSB_LOG_LEVEL_WARNING: |
| prefix = "warning"; |
| break; |
| case LIBUSB_LOG_LEVEL_ERROR: |
| prefix = "error"; |
| break; |
| case LIBUSB_LOG_LEVEL_DEBUG: |
| prefix = "debug"; |
| break; |
| case LIBUSB_LOG_LEVEL_NONE: |
| return; |
| default: |
| prefix = "unknown"; |
| break; |
| } |
| |
| if (global_debug) { |
| header_len = snprintf(buf, sizeof(buf), |
| "[%2d.%06d] [%08x] libusbx: %s [%s] ", |
| (int)now.tv_sec, (int)now.tv_usec, usbi_get_tid(), prefix, function); |
| } else { |
| header_len = snprintf(buf, sizeof(buf), |
| "libusbx: %s [%s] ", prefix, function); |
| } |
| |
| if (header_len < 0 || header_len >= sizeof(buf)) { |
| /* Somehow snprintf failed to write to the buffer, |
| * remove the header so something useful is output. */ |
| header_len = 0; |
| } |
| /* Make sure buffer is NUL terminated */ |
| buf[header_len] = '\0'; |
| text_len = vsnprintf(buf + header_len, sizeof(buf) - header_len, |
| format, args); |
| if (text_len < 0 || text_len + header_len >= sizeof(buf)) { |
| /* Truncated log output. On some platforms a -1 return value means |
| * that the output was truncated. */ |
| text_len = sizeof(buf) - header_len; |
| } |
| if (header_len + text_len + sizeof(USBI_LOG_LINE_END) >= sizeof(buf)) { |
| /* Need to truncate the text slightly to fit on the terminator. */ |
| text_len -= (header_len + text_len + sizeof(USBI_LOG_LINE_END)) - sizeof(buf); |
| } |
| strcpy(buf + header_len + text_len, USBI_LOG_LINE_END); |
| |
| usbi_log_str(ctx, level, buf); |
| } |
| |
| void usbi_log(struct libusb_context *ctx, enum libusb_log_level level, |
| const char *function, const char *format, ...) |
| { |
| va_list args; |
| |
| va_start (args, format); |
| usbi_log_v(ctx, level, function, format, args); |
| va_end (args); |
| } |
| |
| /** \ingroup misc |
| * Returns a constant NULL-terminated string with the ASCII name of a libusbx |
| * error or transfer status code. The caller must not free() the returned |
| * string. |
| * |
| * \param error_code The \ref libusb_error or libusb_transfer_status code to |
| * return the name of. |
| * \returns The error name, or the string **UNKNOWN** if the value of |
| * error_code is not a known error / status code. |
| */ |
| DEFAULT_VISIBILITY const char * LIBUSB_CALL libusb_error_name(int error_code) |
| { |
| switch (error_code) { |
| case LIBUSB_ERROR_IO: |
| return "LIBUSB_ERROR_IO"; |
| case LIBUSB_ERROR_INVALID_PARAM: |
| return "LIBUSB_ERROR_INVALID_PARAM"; |
| case LIBUSB_ERROR_ACCESS: |
| return "LIBUSB_ERROR_ACCESS"; |
| case LIBUSB_ERROR_NO_DEVICE: |
| return "LIBUSB_ERROR_NO_DEVICE"; |
| case LIBUSB_ERROR_NOT_FOUND: |
| return "LIBUSB_ERROR_NOT_FOUND"; |
| case LIBUSB_ERROR_BUSY: |
| return "LIBUSB_ERROR_BUSY"; |
| case LIBUSB_ERROR_TIMEOUT: |
| return "LIBUSB_ERROR_TIMEOUT"; |
| case LIBUSB_ERROR_OVERFLOW: |
| return "LIBUSB_ERROR_OVERFLOW"; |
| case LIBUSB_ERROR_PIPE: |
| return "LIBUSB_ERROR_PIPE"; |
| case LIBUSB_ERROR_INTERRUPTED: |
| return "LIBUSB_ERROR_INTERRUPTED"; |
| case LIBUSB_ERROR_NO_MEM: |
| return "LIBUSB_ERROR_NO_MEM"; |
| case LIBUSB_ERROR_NOT_SUPPORTED: |
| return "LIBUSB_ERROR_NOT_SUPPORTED"; |
| case LIBUSB_ERROR_OTHER: |
| return "LIBUSB_ERROR_OTHER"; |
| |
| case LIBUSB_TRANSFER_ERROR: |
| return "LIBUSB_TRANSFER_ERROR"; |
| case LIBUSB_TRANSFER_TIMED_OUT: |
| return "LIBUSB_TRANSFER_TIMED_OUT"; |
| case LIBUSB_TRANSFER_CANCELLED: |
| return "LIBUSB_TRANSFER_CANCELLED"; |
| case LIBUSB_TRANSFER_STALL: |
| return "LIBUSB_TRANSFER_STALL"; |
| case LIBUSB_TRANSFER_NO_DEVICE: |
| return "LIBUSB_TRANSFER_NO_DEVICE"; |
| case LIBUSB_TRANSFER_OVERFLOW: |
| return "LIBUSB_TRANSFER_OVERFLOW"; |
| |
| case 0: |
| return "LIBUSB_SUCCESS / LIBUSB_TRANSFER_COMPLETED"; |
| default: |
| return "**UNKNOWN**"; |
| } |
| } |
| |
| /** \ingroup misc |
| * Returns a pointer to const struct libusb_version with the version |
| * (major, minor, micro, nano and rc) of the running library. |
| */ |
| DEFAULT_VISIBILITY |
| const struct libusb_version * LIBUSB_CALL libusb_get_version(void) |
| { |
| return &libusb_version_internal; |
| } |