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/*
* This file is part of the libjaylink project.
*
* Copyright (C) 2014-2016 Marc Schink <jaylink-dev@marcschink.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdbool.h>
#ifdef _WIN32
#include <winsock2.h>
#endif
#ifdef HAVE_LIBUSB
#include <libusb.h>
#endif
#include "libjaylink.h"
#include "libjaylink-internal.h"
/**
* @mainpage
*
* @section sec_intro Introduction
*
* This document describes the API of libjaylink.
*
* libjaylink is a shared library written in C to access SEGGER J-Link and
* compatible devices.
*
* @section sec_error Error handling
*
* The libjaylink functions which can fail use the return value to indicate an
* error. The functions typically return an error code of #jaylink_error.
* For each function, all possible error codes and their detailed descriptions
* are documented. As the possible error codes returned by a function may
* change it is recommended to also always cover unexpected values when
* checking for error codes to be compatible with later versions of libjaylink.
*
* There are a few exceptions where a function directly returns the result
* instead of an error code because it is more convenient from an API
* perspective and because there is only a single reason for failure which is
* clearly distinguishable from the result.
*
* @section sec_license Copyright and license
*
* libjaylink is licensed under the terms of the GNU General Public
* License (GPL), version 2 or later.
*
* @section sec_website Website
*
* <a href="http://git.zapb.de/libjaylink.git">git.zapb.de/libjaylink.git</a>
*/
/**
* @file
*
* Core library functions.
*/
/**
* Initialize libjaylink.
*
* This function must be called before any other libjaylink function is called.
*
* @param[out] ctx Newly allocated libjaylink context on success, and undefined
* on failure.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_MALLOC Memory allocation error.
* @retval JAYLINK_ERR Other error conditions.
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_init(struct jaylink_context **ctx)
{
int ret;
struct jaylink_context *context;
#ifdef _WIN32
WSADATA wsa_data;
#endif
if (!ctx)
return JAYLINK_ERR_ARG;
context = malloc(sizeof(struct jaylink_context));
if (!context)
return JAYLINK_ERR_MALLOC;
#ifdef HAVE_LIBUSB
if (libusb_init(&context->usb_ctx) != LIBUSB_SUCCESS) {
free(context);
return JAYLINK_ERR;
}
#endif
#ifdef _WIN32
ret = WSAStartup(MAKEWORD(2, 2), &wsa_data);
if (ret != 0) {
#ifdef HAVE_LIBUSB
libusb_exit(context->usb_ctx);
#endif
free(context);
return JAYLINK_ERR;
}
if (LOBYTE(wsa_data.wVersion) != 2 || HIBYTE(wsa_data.wVersion) != 2) {
#ifdef HAVE_LIBUSB
libusb_exit(context->usb_ctx);
#endif
free(context);
return JAYLINK_ERR;
}
#endif
context->devs = NULL;
context->discovered_devs = NULL;
/* Show error and warning messages by default. */
context->log_level = JAYLINK_LOG_LEVEL_WARNING;
context->log_callback = &log_vprintf;
context->log_callback_data = NULL;
ret = jaylink_log_set_domain(context, JAYLINK_LOG_DOMAIN_DEFAULT);
if (ret != JAYLINK_OK) {
#ifdef HAVE_LIBUSB
libusb_exit(context->usb_ctx);
#endif
#ifdef _WIN32
WSACleanup();
#endif
free(context);
return ret;
}
*ctx = context;
return JAYLINK_OK;
}
/**
* Shutdown libjaylink.
*
* @param[in,out] ctx libjaylink context.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_exit(struct jaylink_context *ctx)
{
struct list *item;
if (!ctx)
return JAYLINK_ERR_ARG;
item = ctx->discovered_devs;
while (item) {
jaylink_unref_device((struct jaylink_device *)item->data);
item = item->next;
}
list_free(ctx->discovered_devs);
list_free(ctx->devs);
#ifdef HAVE_LIBUSB
libusb_exit(ctx->usb_ctx);
#endif
#ifdef _WIN32
WSACleanup();
#endif
free(ctx);
return JAYLINK_OK;
}
/**
* Check for a capability of libjaylink.
*
* @param[in] cap Capability to check for.
*
* @retval true Capability is supported.
* @retval false Capability is not supported or invalid argument.
*
* @since 0.1.0
*/
JAYLINK_API bool jaylink_library_has_cap(enum jaylink_capability cap)
{
switch (cap) {
#ifdef HAVE_LIBUSB
case JAYLINK_CAP_HIF_USB:
return true;
#endif
default:
return false;
}
}
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