backend.c

Go to the documentation of this file.

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Peter Stuge <peter@stuge.se>
 *
 * 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 3 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/>.
 */

#include <config.h>
#include <glib.h>
#ifdef _WIN32
#include <winsock2.h>
#endif
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

/** @cond PRIVATE */
#define LOG_PREFIX "backend"
/** @endcond */

/**
 * @mainpage libsigrok API
 *
 * @section sec_intro Introduction
 *
 * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
 * portable, cross-platform, Free/Libre/Open-Source signal analysis software
 * suite that supports various device types (such as logic analyzers,
 * oscilloscopes, multimeters, and more).
 *
 * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared
 * library written in C which provides the basic API for talking to
 * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a>
 * and reading/writing the acquired data into various
 * <a href="http://sigrok.org/wiki/Input_output_formats">input/output
 * file formats</a>.
 *
 * @section sec_api API reference
 *
 * See the "Modules" page for an introduction to various libsigrok
 * related topics and the detailed API documentation of the respective
 * functions.
 *
 * You can also browse the API documentation by file, or review all
 * data structures.
 *
 * @section sec_mailinglists Mailing lists
 *
 * There is one mailing list for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a>.
 *
 * @section sec_irc IRC
 *
 * You can find the sigrok developers in the
 * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
 * IRC channel on Freenode.
 *
 * @section sec_website Website
 *
 * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
 */

/**
 * @file
 *
 * Initializing and shutting down libsigrok.
 */

/**
 * @defgroup grp_init Initialization
 *
 * Initializing and shutting down libsigrok.
 *
 * Before using any of the libsigrok functionality (except for
 * sr_log_loglevel_set()), sr_init() must be called to initialize the
 * library, which will return a struct sr_context when the initialization
 * was successful.
 *
 * When libsigrok functionality is no longer needed, sr_exit() should be
 * called, which will (among other things) free the struct sr_context.
 *
 * Example for a minimal program using libsigrok:
 *
 * @code{.c}
 *   #include <stdio.h>
 *   #include <libsigrok/libsigrok.h>
 *
 *   int main(int argc, char **argv)
 *   {
 *      int ret;
 *      struct sr_context *sr_ctx;
 *
 *      if ((ret = sr_init(&sr_ctx)) != SR_OK) {
 *              printf("Error initializing libsigrok (%s): %s.\n",
 *                     sr_strerror_name(ret), sr_strerror(ret));
 *              return 1;
 *      }
 *
 *      // Use libsigrok functions here...
 *
 *      if ((ret = sr_exit(sr_ctx)) != SR_OK) {
 *              printf("Error shutting down libsigrok (%s): %s.\n",
 *                     sr_strerror_name(ret), sr_strerror(ret));
 *              return 1;
 *      }
 *
 *      return 0;
 *   }
 * @endcode
 *
 * @{
 */

static void print_versions(void)
{
        GString *s;
#if defined(HAVE_LIBUSB_1_0) && !defined(__FreeBSD__)
        const struct libusb_version *lv;
#endif

        s = g_string_sized_new(200);

        sr_dbg("libsigrok %s/%s (rt: %s/%s).",
                SR_PACKAGE_VERSION_STRING, SR_LIB_VERSION_STRING,
                sr_package_version_string_get(), sr_lib_version_string_get());

        g_string_append(s, "Libs: ");
        g_string_append_printf(s, "glib %d.%d.%d (rt: %d.%d.%d/%d:%d), ",
                GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
                glib_major_version, glib_minor_version, glib_micro_version,
                glib_binary_age, glib_interface_age);
        g_string_append_printf(s, "libzip %s, ", CONF_LIBZIP_VERSION);
#ifdef HAVE_LIBSERIALPORT
        g_string_append_printf(s, "libserialport %s/%s (rt: %s/%s), ",
                SP_PACKAGE_VERSION_STRING, SP_LIB_VERSION_STRING,
                sp_get_package_version_string(), sp_get_lib_version_string());
#endif
#ifdef HAVE_LIBUSB_1_0
#ifdef __FreeBSD__
        g_string_append_printf(s, "libusb-1.0 %s, ", CONF_LIBUSB_1_0_VERSION);
#else
        lv = libusb_get_version();
        g_string_append_printf(s, "libusb-1.0 %d.%d.%d.%d%s, ",
                lv->major, lv->minor, lv->micro, lv->nano, lv->rc);
#endif
#endif
#ifdef HAVE_LIBFTDI
        g_string_append_printf(s, "libftdi %s, ", CONF_LIBFTDI_VERSION);
#endif
#ifdef HAVE_LIBGPIB
        g_string_append_printf(s, "libgpib %s, ", CONF_LIBGPIB_VERSION);
#endif
#ifdef HAVE_LIBREVISA
        g_string_append_printf(s, "librevisa %s, ", CONF_LIBREVISA_VERSION);
#endif
        s->str[s->len - 2] = '.';
        s->str[s->len - 1] = '\0';
        sr_dbg("%s", s->str);

        s = g_string_truncate(s, 0);
        g_string_append_printf(s, "Host: %s, ", CONF_HOST);
#ifdef WORDS_BIGENDIAN
        g_string_append_printf(s, "big-endian.");
#else
        g_string_append_printf(s, "little-endian.");
#endif
        sr_dbg("%s", s->str);

        s = g_string_truncate(s, 0);
        g_string_append_printf(s, "SCPI backends: ");

        g_string_append_printf(s, "TCP, ");
#if HAVE_RPC
        g_string_append_printf(s, "RPC, ");
#endif
#ifdef HAVE_LIBSERIALPORT
        g_string_append_printf(s, "serial, ");
#endif
#ifdef HAVE_LIBREVISA
        g_string_append_printf(s, "VISA, ");
#endif
#ifdef HAVE_LIBGPIB
        g_string_append_printf(s, "GPIB, ");
#endif
#ifdef HAVE_LIBUSB_1_0
        g_string_append_printf(s, "USBTMC, ");
#endif
        s->str[s->len - 2] = '.';
        s->str[s->len - 1] = '\0';
        sr_dbg("%s", s->str);

        g_string_free(s, TRUE);
}

/**
 * Sanity-check all libsigrok drivers.
 *
 * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
 *
 * @retval SR_OK All drivers are OK
 * @retval SR_ERR One or more drivers have issues.
 * @retval SR_ERR_ARG Invalid argument.
 */
static int sanity_check_all_drivers(const struct sr_context *ctx)
{
        int i, errors, ret = SR_OK;
        struct sr_dev_driver **drivers;
        const char *d;

        if (!ctx)
                return SR_ERR_ARG;

        sr_spew("Sanity-checking all drivers.");

        drivers = sr_driver_list(ctx);
        for (i = 0; drivers[i]; i++) {
                errors = 0;

                d = (drivers[i]->name) ? drivers[i]->name : "NULL";

                if (!drivers[i]->name) {
                        sr_err("No name in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->longname) {
                        sr_err("No longname in driver %d ('%s').", i, d);
                        errors++;
                }
                if (drivers[i]->api_version < 1) {
                        sr_err("API version in driver %d ('%s') < 1.", i, d);
                        errors++;
                }
                if (!drivers[i]->init) {
                        sr_err("No init in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->cleanup) {
                        sr_err("No cleanup in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->scan) {
                        sr_err("No scan in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->dev_list) {
                        sr_err("No dev_list in driver %d ('%s').", i, d);
                        errors++;
                }
                /* Note: config_get() is optional. */
                if (!drivers[i]->config_set) {
                        sr_err("No config_set in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->config_list) {
                        sr_err("No config_list in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->dev_open) {
                        sr_err("No dev_open in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->dev_close) {
                        sr_err("No dev_close in driver %d ('%s').", i, d);
                        errors++;
                }
                if (!drivers[i]->dev_acquisition_start) {
                        sr_err("No dev_acquisition_start in driver %d ('%s').",
                               i, d);
                        errors++;
                }
                if (!drivers[i]->dev_acquisition_stop) {
                        sr_err("No dev_acquisition_stop in driver %d ('%s').",
                               i, d);
                        errors++;
                }

                /* Note: 'priv' is allowed to be NULL. */

                if (errors == 0)
                        continue;

                ret = SR_ERR;
        }

        return ret;
}

/**
 * Sanity-check all libsigrok input modules.
 *
 * @retval SR_OK All modules are OK
 * @retval SR_ERR One or more modules have issues.
 */
static int sanity_check_all_input_modules(void)
{
        int i, errors, ret = SR_OK;
        const struct sr_input_module **inputs;
        const char *d;

        sr_spew("Sanity-checking all input modules.");

        inputs = sr_input_list();
        for (i = 0; inputs[i]; i++) {
                errors = 0;

                d = (inputs[i]->id) ? inputs[i]->id : "NULL";

                if (!inputs[i]->id) {
                        sr_err("No ID in module %d ('%s').", i, d);
                        errors++;
                }
                if (!inputs[i]->name) {
                        sr_err("No name in module %d ('%s').", i, d);
                        errors++;
                }
                if (!inputs[i]->desc) {
                        sr_err("No description in module %d ('%s').", i, d);
                        errors++;
                }
                if (!inputs[i]->init) {
                        sr_err("No init in module %d ('%s').", i, d);
                        errors++;
                }
                if (!inputs[i]->receive) {
                        sr_err("No receive in module %d ('%s').", i, d);
                        errors++;
                }
                if (!inputs[i]->end) {
                        sr_err("No end in module %d ('%s').", i, d);
                        errors++;
                }

                if (errors == 0)
                        continue;

                ret = SR_ERR;
        }

        return ret;
}

/**
 * Sanity-check all libsigrok output modules.
 *
 * @retval SR_OK All modules are OK
 * @retval SR_ERR One or more modules have issues.
 */
static int sanity_check_all_output_modules(void)
{
        int i, errors, ret = SR_OK;
        const struct sr_output_module **outputs;
        const char *d;

        sr_spew("Sanity-checking all output modules.");

        outputs = sr_output_list();
        for (i = 0; outputs[i]; i++) {
                errors = 0;

                d = (outputs[i]->id) ? outputs[i]->id : "NULL";

                if (!outputs[i]->id) {
                        sr_err("No ID in module %d ('%s').", i, d);
                        errors++;
                }
                if (!outputs[i]->name) {
                        sr_err("No name in module %d ('%s').", i, d);
                        errors++;
                }
                if (!outputs[i]->desc) {
                        sr_err("No description in module '%s'.", d);
                        errors++;
                }
                if (!outputs[i]->receive) {
                        sr_err("No receive in module '%s'.", d);
                        errors++;
                }

                if (errors == 0)
                        continue;

                ret = SR_ERR;
        }

        return ret;
}

/**
 * Sanity-check all libsigrok transform modules.
 *
 * @retval SR_OK All modules are OK
 * @retval SR_ERR One or more modules have issues.
 */
static int sanity_check_all_transform_modules(void)
{
        int i, errors, ret = SR_OK;
        const struct sr_transform_module **transforms;
        const char *d;

        sr_spew("Sanity-checking all transform modules.");

        transforms = sr_transform_list();
        for (i = 0; transforms[i]; i++) {
                errors = 0;

                d = (transforms[i]->id) ? transforms[i]->id : "NULL";

                if (!transforms[i]->id) {
                        sr_err("No ID in module %d ('%s').", i, d);
                        errors++;
                }
                if (!transforms[i]->name) {
                        sr_err("No name in module %d ('%s').", i, d);
                        errors++;
                }
                if (!transforms[i]->desc) {
                        sr_err("No description in module '%s'.", d);
                        errors++;
                }
                /* Note: options() is optional. */
                /* Note: init() is optional. */
                if (!transforms[i]->receive) {
                        sr_err("No receive in module '%s'.", d);
                        errors++;
                }
                /* Note: cleanup() is optional. */

                if (errors == 0)
                        continue;

                ret = SR_ERR;
        }

        return ret;
}

/**
 * Initialize libsigrok.
 *
 * This function must be called before any other libsigrok function.
 *
 * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
 *            This will be a pointer to a newly allocated libsigrok context
 *            object upon success, and is undefined upon errors.
 *
 * @return SR_OK upon success, a (negative) error code otherwise. Upon errors
 *         the 'ctx' pointer is undefined and should not be used. Upon success,
 *         the context will be free'd by sr_exit() as part of the libsigrok
 *         shutdown.
 *
 * @since 0.2.0
 */
SR_API int sr_init(struct sr_context **ctx)
{
        int ret = SR_ERR;
        struct sr_context *context;
        struct sr_dev_driver ***lists, **drivers;
        GArray *array;
#ifdef _WIN32
        WSADATA wsadata;
#endif

        print_versions();

        if (!ctx) {
                sr_err("%s(): libsigrok context was NULL.", __func__);
                return SR_ERR;
        }

        context = g_malloc0(sizeof(struct sr_context));

        /* Generate ctx->driver_list at runtime. */
        array = g_array_new(TRUE, FALSE, sizeof(struct sr_dev_driver *));
        for (lists = drivers_lists; *lists; lists++)
                for (drivers = *lists; *drivers; drivers++)
                        g_array_append_val(array, *drivers);
        context->driver_list = (struct sr_dev_driver **)array->data;
        g_array_free(array, FALSE);

        if (sanity_check_all_drivers(context) < 0) {
                sr_err("Internal driver error(s), aborting.");
                return ret;
        }

        if (sanity_check_all_input_modules() < 0) {
                sr_err("Internal input module error(s), aborting.");
                return ret;
        }

        if (sanity_check_all_output_modules() < 0) {
                sr_err("Internal output module error(s), aborting.");
                return ret;
        }

        if (sanity_check_all_transform_modules() < 0) {
                sr_err("Internal transform module error(s), aborting.");
                return ret;
        }

#ifdef _WIN32
        if ((ret = WSAStartup(MAKEWORD(2, 2), &wsadata)) != 0) {
                sr_err("WSAStartup failed with error code %d.", ret);
                ret = SR_ERR;
                goto done;
        }
#endif

#ifdef HAVE_LIBUSB_1_0
        ret = libusb_init(&context->libusb_ctx);
        if (LIBUSB_SUCCESS != ret) {
                sr_err("libusb_init() returned %s.", libusb_error_name(ret));
                ret = SR_ERR;
                goto done;
        }
#endif
        sr_resource_set_hooks(context, NULL, NULL, NULL, NULL);

        *ctx = context;
        context = NULL;
        ret = SR_OK;

#if defined(HAVE_LIBUSB_1_0) || defined(_WIN32)
done:
#endif
        g_free(context);
        return ret;
}

/**
 * Shutdown libsigrok.
 *
 * @param ctx Pointer to a libsigrok context struct. Must not be NULL.
 *
 * @retval SR_OK Success
 * @retval other Error code SR_ERR, ...
 *
 * @since 0.2.0
 */
SR_API int sr_exit(struct sr_context *ctx)
{
        if (!ctx) {
                sr_err("%s(): libsigrok context was NULL.", __func__);
                return SR_ERR;
        }

        sr_hw_cleanup_all(ctx);

#ifdef _WIN32
        WSACleanup();
#endif

#ifdef HAVE_LIBUSB_1_0
        libusb_exit(ctx->libusb_ctx);
#endif

        g_free(sr_driver_list(ctx));
        g_free(ctx);

        return SR_OK;
}

/** @} */