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diff --git a/atmel-samd/asf4/samd21/hal/utils/include/utils_event.h b/atmel-samd/asf4/samd21/hal/utils/include/utils_event.h
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+/**
+ * \file
+ *
+ * \brief Events declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ *    Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _UTILS_EVENT_H_INCLUDED
+#define _UTILS_EVENT_H_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <utils.h>
+#include <utils_list.h>
+#include <events.h>
+
+/**
+ * \brief The maximum amount of events
+ */
+#define EVENT_MAX_AMOUNT 8
+
+/**
+ * \brief The size of event mask used, it is EVENT_MAX_AMOUNT rounded up to the
+ *        closest number divisible by 8.
+ */
+#define EVENT_MASK_SIZE (round_up(EVENT_MAX_AMOUNT, 8))
+
+/**
+ * \brief The type of event ID. IDs should start with 0 and be in numerical order.
+ */
+typedef uint8_t event_id_t;
+
+/**
+ * \brief The type of returned parameter. This type is big enough to contain
+ *        pointer to data on any platform.
+ */
+typedef uintptr_t event_data_t;
+
+/**
+ * \brief The type of returned parameter. This type is big enough to contain
+ *        pointer to data on any platform.
+ */
+typedef void (*event_cb_t)(event_id_t id, event_data_t data);
+
+/**
+ * \brief Event structure
+ */
+struct event {
+	struct list_element elem;                  /*! The pointer to next event */
+	uint8_t             mask[EVENT_MASK_SIZE]; /*! Mask of event IDs callback is called for */
+	event_cb_t          cb;                    /*! Callback to be called when an event occurs */
+};
+
+/**
+ * \brief Subscribe to event
+ *
+ * \param[in] event The pointer to event structure
+ * \param[in] id The event ID to subscribe to
+ * \param[in] cb The callback function to call when the given event occurs
+ *
+ * \return The status of subscription
+ */
+int32_t event_subscribe(struct event *const event, const event_id_t id, event_cb_t cb);
+
+/**
+ * \brief Remove event from subscription
+ *
+ * \param[in] event The pointer to event structure
+ * \param[in] id The event ID to remove subscription from
+ *
+ * \return The status of subscription removing
+ */
+int32_t event_unsubscribe(struct event *const event, const event_id_t id);
+
+/**
+ * \brief Post event
+ *
+ * \param[in] id The event ID to post
+ * \param[in] data The event data to be passed to event subscribers
+ */
+void event_post(const event_id_t id, const event_data_t data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UTILS_EVENT_H_INCLUDED */