source: mainline/uspace/drv/bus/usb/usbhid/kbd/kbddev.c@ 5ac5eb1

/*
 * Copyright (c) 2011 Lubos Slovak
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR 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.
 */

/** @addtogroup drvusbhid
 * @{
 */
/**
 * @file
 * USB HID keyboard device structure and API.
 */

#include <errno.h>
#include <str_error.h>
#include <stdio.h>

#include <io/keycode.h>
#include <io/console.h>
#include <abi/ipc/methods.h>
#include <ipc/kbdev.h>
#include <async.h>
#include <fibril.h>
#include <fibril_synch.h>

#include <ddf/log.h>

#include <usb/usb.h>
#include <usb/dev/dp.h>
#include <usb/dev/request.h>
#include <usb/hid/hid.h>
#include <usb/dev/pipes.h>
#include <usb/debug.h>
#include <usb/hid/hidparser.h>
#include <usb/classes/classes.h>
#include <usb/hid/usages/core.h>
#include <usb/hid/request.h>
#include <usb/hid/hidreport.h>
#include <usb/hid/usages/led.h>

#include <usb/dev/driver.h>

#include "kbddev.h"

#include "conv.h"
#include "kbdrepeat.h"

#include "../usbhid.h"

static void default_connection_handler(ddf_fun_t *, ipc_callid_t, ipc_call_t *);
static ddf_dev_ops_t kbdops = { .default_handler = default_connection_handler };


static const unsigned DEFAULT_ACTIVE_MODS = KM_NUM_LOCK;

static const uint8_t ERROR_ROLLOVER = 1;

/** Default idle rate for keyboards. */
static const uint8_t IDLE_RATE = 0;

/** Delay before a pressed key starts auto-repeating. */
static const unsigned int DEFAULT_DELAY_BEFORE_FIRST_REPEAT = 500 * 1000;

/** Delay between two repeats of a pressed key when auto-repeating. */
static const unsigned int DEFAULT_REPEAT_DELAY = 50 * 1000;


/** Keyboard polling endpoint description for boot protocol class. */
const usb_endpoint_description_t usb_hid_kbd_poll_endpoint_description = {
        .transfer_type = USB_TRANSFER_INTERRUPT,
        .direction = USB_DIRECTION_IN,
        .interface_class = USB_CLASS_HID,
        .interface_subclass = USB_HID_SUBCLASS_BOOT,
        .interface_protocol = USB_HID_PROTOCOL_KEYBOARD,
        .flags = 0
};

const char *HID_KBD_FUN_NAME = "keyboard";
const char *HID_KBD_CATEGORY_NAME = "keyboard";

static void usb_kbd_set_led(usb_hid_dev_t *hid_dev, usb_kbd_t *kbd_dev);

static const uint8_t USB_KBD_BOOT_REPORT_DESCRIPTOR[] = {
        0x05, 0x01,  /* Usage Page (Generic Desktop), */
        0x09, 0x06,  /* Usage (Keyboard), */
        0xA1, 0x01,  /* Collection (Application), */
        0x75, 0x01,  /*   Report Size (1), */
        0x95, 0x08,  /*   Report Count (8), */
        0x05, 0x07,  /*   Usage Page (Key Codes); */
        0x19, 0xE0,  /*   Usage Minimum (224), */
        0x29, 0xE7,  /*   Usage Maximum (231), */
        0x15, 0x00,  /*   Logical Minimum (0), */
        0x25, 0x01,  /*   Logical Maximum (1), */
        0x81, 0x02,  /*   Input (Data, Variable, Absolute),  ; Modifier byte */
        0x95, 0x01,  /*   Report Count (1), */
        0x75, 0x08,  /*   Report Size (8), */
        0x81, 0x01,  /*   Input (Constant),                  ; Reserved byte */
        0x95, 0x05,  /*   Report Count (5), */
        0x75, 0x01,  /*   Report Size (1), */
        0x05, 0x08,  /*   Usage Page (Page# for LEDs), */
        0x19, 0x01,  /*   Usage Minimum (1), */
        0x29, 0x05,  /*   Usage Maxmimum (5), */
        0x91, 0x02,  /*   Output (Data, Variable, Absolute),  ; LED report */
        0x95, 0x01,  /*   Report Count (1), */
        0x75, 0x03,  /*   Report Size (3), */
        0x91, 0x01,  /*   Output (Constant),            ; LED report padding */
        0x95, 0x06,  /*   Report Count (6), */
        0x75, 0x08,  /*   Report Size (8), */
        0x15, 0x00,  /*   Logical Minimum (0), */
        0x25, 0xff,  /*   Logical Maximum (255), */
        0x05, 0x07,  /*   Usage Page (Key Codes), */
        0x19, 0x00,  /*   Usage Minimum (0), */
        0x29, 0xff,  /*   Usage Maximum (255), */
        0x81, 0x00,  /*   Input (Data, Array),   ; Key arrays (6 bytes) */
        0xC0         /* End Collection */
};

typedef enum usb_kbd_flags {
        USB_KBD_STATUS_UNINITIALIZED = 0,
        USB_KBD_STATUS_INITIALIZED = 1,
        USB_KBD_STATUS_TO_DESTROY = -1
} usb_kbd_flags;

/* IPC method handler                                                         */

/**
 * Default handler for IPC methods not handled by DDF.
 *
 * Currently recognizes only two methods (IPC_M_CONNECT_TO_ME and KBDEV_SET_IND)
 * IPC_M_CONNECT_TO_ME assumes the caller is the console and  stores IPC
 * session to it for later use by the driver to notify about key events.
 * KBDEV_SET_IND sets LED keyboard indicators.
 *
 * @param fun Device function handling the call.
 * @param icallid Call id.
 * @param icall Call data.
 */
static void default_connection_handler(ddf_fun_t *fun,
    ipc_callid_t icallid, ipc_call_t *icall)
{
        const sysarg_t method = IPC_GET_IMETHOD(*icall);
        usb_kbd_t *kbd_dev = ddf_fun_data_get(fun);

        switch (method) {
        case KBDEV_SET_IND:
                kbd_dev->mods = IPC_GET_ARG1(*icall);
                usb_kbd_set_led(kbd_dev->hid_dev, kbd_dev);
                async_answer_0(icallid, EOK);
                break;
        /* This might be ugly but async_callback_receive_start makes no
         * difference for incorrect call and malloc failure. */
        case IPC_M_CONNECT_TO_ME: {
                async_sess_t *sess =
                    async_callback_receive_start(EXCHANGE_SERIALIZE, icall);
                /* Probably ENOMEM error, try again. */
                if (sess == NULL) {
                        usb_log_warning(
                            "Failed to create start console session.\n");
                        async_answer_0(icallid, EAGAIN);
                        break;
                }
                if (kbd_dev->client_sess == NULL) {
                        kbd_dev->client_sess = sess;
                        usb_log_debug("%s: OK\n", __FUNCTION__);
                        async_answer_0(icallid, EOK);
                } else {
                        usb_log_error("%s: console session already set\n",
                           __FUNCTION__);
                        async_answer_0(icallid, ELIMIT);
                }
                break;
        }
        default:
                        usb_log_error("%s: Unknown method: %d.\n",
                            __FUNCTION__, (int) method);
                        async_answer_0(icallid, EINVAL);
                        break;
        }

}

/* Key processing functions                                                   */

/**
 * Handles turning of LED lights on and off.
 *
 * As with most other keyboards, the LED indicators in USB keyboards are
 * driven by software. When state of some modifier changes, the input server
 * will call us and tell us to update the LED state and what the new state
 * should be.
 *
 * This functions sets the LED lights according to current settings of modifiers
 * kept in the keyboard device structure.
 *
 * @param kbd_dev Keyboard device structure.
 */
static void usb_kbd_set_led(usb_hid_dev_t *hid_dev, usb_kbd_t *kbd_dev)
{
        if (kbd_dev->output_size == 0) {
                return;
        }

        /* Reset the LED data. */
        memset(kbd_dev->led_data, 0, kbd_dev->led_output_size * sizeof(int32_t));
        usb_log_debug("Creating output report:\n");

        usb_hid_report_field_t *field = usb_hid_report_get_sibling(
            &hid_dev->report, NULL, kbd_dev->led_path,
            USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY,
            USB_HID_REPORT_TYPE_OUTPUT);

        while (field != NULL) {

                if ((field->usage == USB_HID_LED_NUM_LOCK)
                    && (kbd_dev->mods & KM_NUM_LOCK)){
                        field->value = 1;
                }

                if ((field->usage == USB_HID_LED_CAPS_LOCK)
                    && (kbd_dev->mods & KM_CAPS_LOCK)){
                        field->value = 1;
                }

                if ((field->usage == USB_HID_LED_SCROLL_LOCK)
                    && (kbd_dev->mods & KM_SCROLL_LOCK)){
                        field->value = 1;
                }

                field = usb_hid_report_get_sibling(
                    &hid_dev->report, field, kbd_dev->led_path,
                USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY,
                    USB_HID_REPORT_TYPE_OUTPUT);
        }

        // TODO: what about the Report ID?
        int rc = usb_hid_report_output_translate(&hid_dev->report, 0,
            kbd_dev->output_buffer, kbd_dev->output_size);

        if (rc != EOK) {
                usb_log_warning("Could not translate LED output to output"
                    "report.\n");
                return;
        }

        usb_log_debug("Output report buffer: %s\n",
            usb_debug_str_buffer(kbd_dev->output_buffer, kbd_dev->output_size,
                0));

        rc = usbhid_req_set_report(
            usb_device_get_default_pipe(hid_dev->usb_dev),
            usb_device_get_iface_number(hid_dev->usb_dev),
            USB_HID_REPORT_TYPE_OUTPUT,
            kbd_dev->output_buffer, kbd_dev->output_size);
        if (rc != EOK) {
                usb_log_warning("Failed to set kbd indicators.\n");
        }
}

/** Send key event.
 *
 * @param kbd_dev Keyboard device structure.
 * @param type Type of the event (press / release). Recognized values:
 *             KEY_PRESS, KEY_RELEASE
 * @param key Key code
 */
void usb_kbd_push_ev(usb_kbd_t *kbd_dev, int type, unsigned key)
{
        usb_log_debug2("Sending kbdev event %d/%d to the console\n", type, key);
        if (kbd_dev->client_sess == NULL) {
                usb_log_warning(
                    "Connection to console not ready, key discarded.\n");
                return;
        }

        async_exch_t *exch = async_exchange_begin(kbd_dev->client_sess);
        if (exch != NULL) {
                async_msg_2(exch, KBDEV_EVENT, type, key);
                async_exchange_end(exch);
        } else {
                usb_log_warning("Failed to send key to console.\n");
        }
}

static inline int usb_kbd_is_lock(unsigned int key_code)
{
        return (key_code == KC_NUM_LOCK
            || key_code == KC_SCROLL_LOCK
            || key_code == KC_CAPS_LOCK);
}

static size_t find_in_array_int32(int32_t val, int32_t *arr, size_t arr_size)
{
        for (size_t i = 0; i < arr_size; i++) {
                if (arr[i] == val) {
                        return i;
                }
        }

        return (size_t) -1;
}

/**
 * Checks if some keys were pressed or released and generates key events.
 *
 * An event is created only when key is pressed or released. Besides handling
 * the events (usb_kbd_push_ev()), the auto-repeat fibril is notified about
 * key presses and releases (see usb_kbd_repeat_start() and 
 * usb_kbd_repeat_stop()).
 *
 * @param kbd_dev Keyboard device structure.
 * @param key_codes Parsed keyboard report - codes of currently pressed keys 
 *                  according to HID Usage Tables.
 * @param count Number of key codes in report (size of the report).
 *
 * @sa usb_kbd_push_ev(), usb_kbd_repeat_start(), usb_kbd_repeat_stop()
 */
static void usb_kbd_check_key_changes(usb_hid_dev_t *hid_dev,
    usb_kbd_t *kbd_dev)
{

        /*
         * First of all, check if the kbd have reported phantom state.
         *
         * As there is no way to distinguish keys from modifiers, we do not have
         * a way to check that 'all keys report Error Rollover'. We thus check
         * if there is at least one such error and in such case we ignore the
         * whole input report.
         */
        size_t i = find_in_array_int32(ERROR_ROLLOVER, kbd_dev->keys,
            kbd_dev->key_count);
        if (i != (size_t) -1) {
                usb_log_error("Detected phantom state.\n");
                return;
        }

        /*
         * Key releases
         */
        for (i = 0; i < kbd_dev->key_count; i++) {
                const int32_t old_key = kbd_dev->keys_old[i];
                /* Find the old key among currently pressed keys. */
                const size_t pos = find_in_array_int32(old_key, kbd_dev->keys,
                    kbd_dev->key_count);
                /* If the key was not found, we need to signal release. */
                if (pos == (size_t) -1) {
                        const unsigned key = usbhid_parse_scancode(old_key);
                        if (!usb_kbd_is_lock(key)) {
                                usb_kbd_repeat_stop(kbd_dev, key);
                        }
                        usb_kbd_push_ev(kbd_dev, KEY_RELEASE, key);
                        usb_log_debug2("Key released: %u "
                            "(USB code %" PRIu32 ")\n", key, old_key);
                }
        }

        /*
         * Key presses
         */
        for (i = 0; i < kbd_dev->key_count; ++i) {
                const int32_t new_key = kbd_dev->keys[i];
                /* Find the new key among already pressed keys. */
                const size_t pos = find_in_array_int32(new_key,
                    kbd_dev->keys_old, kbd_dev->key_count);
                /* If the key was not found, we need to signal press. */
                if (pos == (size_t) -1) {
                        unsigned key = usbhid_parse_scancode(kbd_dev->keys[i]);
                        if (!usb_kbd_is_lock(key)) {
                                usb_kbd_repeat_start(kbd_dev, key);
                        }
                        usb_kbd_push_ev(kbd_dev, KEY_PRESS, key);
                        usb_log_debug2("Key pressed: %u "
                            "(USB code %" PRIu32 ")\n", key, new_key);
                }
        }

        memcpy(kbd_dev->keys_old, kbd_dev->keys, kbd_dev->key_count * 4);

        // TODO Get rid of this
        char key_buffer[512];
        ddf_dump_buffer(key_buffer, 512,
            kbd_dev->keys_old, 4, kbd_dev->key_count, 0);
        usb_log_debug2("Stored keys %s.\n", key_buffer);
}

/* General kbd functions                                                      */

/**
 * Processes data received from the device in form of report.
 *
 * This function uses the HID report parser to translate the data received from
 * the device into generic USB HID key codes and into generic modifiers bitmap.
 * The parser then calls the given callback (usb_kbd_process_keycodes()).
 *
 * @note Currently, only the boot protocol is supported.
 *
 * @param kbd_dev Keyboard device structure (must be initialized).
 * @param buffer Data from the keyboard (i.e. the report).
 * @param actual_size Size of the data from keyboard (report size) in bytes.
 *
 * @sa usb_kbd_process_keycodes(), usb_hid_boot_keyboard_input_report(),
 *     usb_hid_parse_report().
 */
static void usb_kbd_process_data(usb_hid_dev_t *hid_dev, usb_kbd_t *kbd_dev)
{
        assert(hid_dev != NULL);
        assert(kbd_dev != NULL);

        usb_hid_report_path_t *path = usb_hid_report_path();
        if (path == NULL) {
                usb_log_error("Failed to create hid/kbd report path.\n");
                return;
        }

        int ret =
           usb_hid_report_path_append_item(path, USB_HIDUT_PAGE_KEYBOARD, 0);
        if (ret != EOK) {
                usb_log_error("Failed to append to hid/kbd report path.\n");
                return;
        }

        usb_hid_report_path_set_report_id(path, hid_dev->report_id);

        /* Fill in the currently pressed keys. */
        usb_hid_report_field_t *field = usb_hid_report_get_sibling(
            &hid_dev->report, NULL, path,
            USB_HID_PATH_COMPARE_END | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY,
            USB_HID_REPORT_TYPE_INPUT);
        unsigned i = 0;

        while (field != NULL) {
                usb_log_debug2("FIELD (%p) - VALUE(%d) USAGE(%u)\n",
                    field, field->value, field->usage);

                assert(i < kbd_dev->key_count);

                /* Save the key usage. */
                if (field->value != 0) {
                        kbd_dev->keys[i] = field->usage;
                }
                else {
                        kbd_dev->keys[i] = 0;
                }
                usb_log_debug2("Saved %u. key usage %d\n", i, kbd_dev->keys[i]);

                ++i;
                field = usb_hid_report_get_sibling(
                    &hid_dev->report, field, path, USB_HID_PATH_COMPARE_END
                        | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY,
                    USB_HID_REPORT_TYPE_INPUT);
        }

        usb_hid_report_path_free(path);

        usb_kbd_check_key_changes(hid_dev, kbd_dev);
}

/* HID/KBD structure manipulation                                             */

static int kbd_dev_init(usb_kbd_t *kbd_dev, usb_hid_dev_t *hid_dev)
{
        assert(kbd_dev);
        assert(hid_dev);

        /* Default values */
        fibril_mutex_initialize(&kbd_dev->repeat_mtx);
        kbd_dev->initialized = USB_KBD_STATUS_UNINITIALIZED;

        /* Store link to HID device */
        kbd_dev->hid_dev = hid_dev;

        /* Modifiers and locks */
        kbd_dev->mods = DEFAULT_ACTIVE_MODS;

        /* Autorepeat */
        kbd_dev->repeat.delay_before = DEFAULT_DELAY_BEFORE_FIRST_REPEAT;
        kbd_dev->repeat.delay_between = DEFAULT_REPEAT_DELAY;

        // TODO: make more general
        usb_hid_report_path_t *path = usb_hid_report_path();
        if (path == NULL) {
                usb_log_error("Failed to create kbd report path.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        int ret =
            usb_hid_report_path_append_item(path, USB_HIDUT_PAGE_KEYBOARD, 0);
        if (ret != EOK) {
                usb_log_error("Failed to append item to kbd report path.\n");
                usb_hid_report_path_free(path);
                usb_kbd_destroy(kbd_dev);
                return ret;
        }

        usb_hid_report_path_set_report_id(path, 0);

        kbd_dev->key_count =
            usb_hid_report_size(&hid_dev->report, 0, USB_HID_REPORT_TYPE_INPUT);

        usb_hid_report_path_free(path);

        usb_log_debug("Size of the input report: %zu\n", kbd_dev->key_count);

        kbd_dev->keys = calloc(kbd_dev->key_count, sizeof(int32_t));
        if (kbd_dev->keys == NULL) {
                usb_log_error("Failed to allocate key buffer.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        kbd_dev->keys_old = calloc(kbd_dev->key_count, sizeof(int32_t));
        if (kbd_dev->keys_old == NULL) {
                usb_log_error("Failed to allocate old_key buffer.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        /* Output report */
        kbd_dev->output_size = 0;
        kbd_dev->output_buffer = usb_hid_report_output(&hid_dev->report,
            &kbd_dev->output_size, 0);
        if (kbd_dev->output_buffer == NULL) {
                usb_log_error("Error creating output report buffer.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        usb_log_debug("Output buffer size: %zu\n", kbd_dev->output_size);

        kbd_dev->led_path = usb_hid_report_path();
        if (kbd_dev->led_path == NULL) {
                usb_log_error("Failed to create kbd led report path.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        ret = usb_hid_report_path_append_item(
            kbd_dev->led_path, USB_HIDUT_PAGE_LED, 0);
        if (ret != EOK) {
                usb_log_error("Failed to append to kbd/led report path.\n");
                usb_kbd_destroy(kbd_dev);
                return ret;
        }

        kbd_dev->led_output_size = usb_hid_report_size(
            &hid_dev->report, 0, USB_HID_REPORT_TYPE_OUTPUT);

        usb_log_debug("Output report size (in items): %zu\n",
            kbd_dev->led_output_size);

        kbd_dev->led_data = calloc(kbd_dev->led_output_size, sizeof(int32_t));
        if (kbd_dev->led_data == NULL) {
                usb_log_error("Error creating buffer for LED output report.\n");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }

        /* Set LEDs according to initial setup.
         * Set Idle rate */
        usb_kbd_set_led(hid_dev, kbd_dev);

        usbhid_req_set_idle(usb_device_get_default_pipe(hid_dev->usb_dev),
            usb_device_get_iface_number(hid_dev->usb_dev), IDLE_RATE);


        kbd_dev->initialized = USB_KBD_STATUS_INITIALIZED;
        usb_log_debug("HID/KBD device structure initialized.\n");

        return EOK;
}


/* API functions                                                              */

/**
 * Initialization of the USB/HID keyboard structure.
 *
 * This functions initializes required structures from the device's descriptors.
 *
 * During initialization, the keyboard is switched into boot protocol, the idle
 * rate is set to 0 (infinity), resulting in the keyboard only reporting event
 * when a key is pressed or released. Finally, the LED lights are turned on
 * according to the default setup of lock keys.
 *
 * @note By default, the keyboards is initialized with Num Lock turned on and
 *       other locks turned off.
 *
 * @param kbd_dev Keyboard device structure to be initialized.
 * @param dev DDF device structure of the keyboard.
 *
 * @retval EOK if successful.
 * @retval EINVAL if some parameter is not given.
 * @return Other value inherited from function usbhid_dev_init().
 */
int usb_kbd_init(usb_hid_dev_t *hid_dev, void **data)
{
        usb_log_debug("Initializing HID/KBD structure...\n");

        if (hid_dev == NULL) {
                usb_log_error(
                    "Failed to init keyboard structure: no structure given.\n");
                return EINVAL;
        }

        /* Create the exposed function. */
        usb_log_debug("Creating DDF function %s...\n", HID_KBD_FUN_NAME);
        ddf_fun_t *fun = usb_device_ddf_fun_create(hid_dev->usb_dev,
            fun_exposed, HID_KBD_FUN_NAME);
        if (fun == NULL) {
                usb_log_error("Could not create DDF function node.\n");
                return ENOMEM;
        }

        usb_kbd_t *kbd_dev = ddf_fun_data_alloc(fun, sizeof(usb_kbd_t));
        if (kbd_dev == NULL) {
                usb_log_error("Failed to allocate KBD device structure.\n");
                ddf_fun_destroy(fun);
                return ENOMEM;
        }

        int ret = kbd_dev_init(kbd_dev, hid_dev);
        if (ret != EOK) {
                usb_log_error("Failed to initialize KBD device  structure.\n");
                ddf_fun_destroy(fun);
                return ret;
        }

        /* Store the initialized HID device and HID ops
         * to the DDF function. */
        ddf_fun_set_ops(fun, &kbdops);

        ret = ddf_fun_bind(fun);
        if (ret != EOK) {
                usb_log_error("Could not bind DDF function: %s.\n",
                    str_error(ret));
                usb_kbd_destroy(kbd_dev);
                ddf_fun_destroy(fun);
                return ret;
        }

        usb_log_debug("%s function created. Handle: %" PRIun "\n",
            HID_KBD_FUN_NAME, ddf_fun_get_handle(fun));

        usb_log_debug("Adding DDF function to category %s...\n",
            HID_KBD_CATEGORY_NAME);
        ret = ddf_fun_add_to_category(fun, HID_KBD_CATEGORY_NAME);
        if (ret != EOK) {
                usb_log_error(
                    "Could not add DDF function to category %s: %s.\n",
                    HID_KBD_CATEGORY_NAME, str_error(ret));
                usb_kbd_destroy(kbd_dev);
                if (ddf_fun_unbind(fun) == EOK) {
                        ddf_fun_destroy(fun);
                } else {
                        usb_log_error(
                            "Failed to unbind `%s', will not destroy.\n",
                            ddf_fun_get_name(fun));
                }
                return ret;
        }

        /* Create new fibril for auto-repeat. */
        fid_t fid = fibril_create(usb_kbd_repeat_fibril, kbd_dev);
        if (fid == 0) {
                usb_log_error("Failed to start fibril for KBD auto-repeat");
                usb_kbd_destroy(kbd_dev);
                return ENOMEM;
        }
        fibril_add_ready(fid);
        kbd_dev->fun = fun;
        /* Save the KBD device structure into the HID device structure. */
        *data = kbd_dev;

        return EOK;
}

bool usb_kbd_polling_callback(usb_hid_dev_t *hid_dev, void *data)
{
        if (hid_dev == NULL || data == NULL) {
                /* This means something serious */
                return false;
        }

        usb_kbd_t *kbd_dev = data;
        // TODO: add return value from this function
        usb_kbd_process_data(hid_dev, kbd_dev);

        return true;
}

int usb_kbd_is_initialized(const usb_kbd_t *kbd_dev)
{
        return (kbd_dev->initialized == USB_KBD_STATUS_INITIALIZED);
}

int usb_kbd_is_ready_to_destroy(const usb_kbd_t *kbd_dev)
{
        return (kbd_dev->initialized == USB_KBD_STATUS_TO_DESTROY);
}

/**
 * Properly destroys the USB/HID keyboard structure.
 *
 * @param kbd_dev Pointer to the structure to be destroyed.
 */
void usb_kbd_destroy(usb_kbd_t *kbd_dev)
{
        if (kbd_dev == NULL) {
                return;
        }

        /* Hangup session to the console. */
        if (kbd_dev->client_sess)
                async_hangup(kbd_dev->client_sess);

        //assert(!fibril_mutex_is_locked((*kbd_dev)->repeat_mtx));
        // FIXME - the fibril_mutex_is_locked may not cause
        // fibril scheduling
        while (fibril_mutex_is_locked(&kbd_dev->repeat_mtx)) {}

        /* Free all buffers. */
        free(kbd_dev->keys);
        free(kbd_dev->keys_old);
        free(kbd_dev->led_data);

        usb_hid_report_path_free(kbd_dev->led_path);
        usb_hid_report_output_free(kbd_dev->output_buffer);

        if (kbd_dev->fun) {
                if (ddf_fun_unbind(kbd_dev->fun) != EOK) {
                        usb_log_warning("Failed to unbind %s.\n",
                            ddf_fun_get_name(kbd_dev->fun));
                } else {
                        usb_log_debug2("%s unbound.\n",
                            ddf_fun_get_name(kbd_dev->fun));
                        ddf_fun_destroy(kbd_dev->fun);
                }
        }
}

void usb_kbd_deinit(usb_hid_dev_t *hid_dev, void *data)
{
        if (data != NULL) {
                usb_kbd_t *kbd_dev = data;
                if (usb_kbd_is_initialized(kbd_dev)) {
                        kbd_dev->initialized = USB_KBD_STATUS_TO_DESTROY;
                        /* Wait for autorepeat */
                        async_usleep(CHECK_DELAY);
                }
                usb_kbd_destroy(kbd_dev);
        }
}

int usb_kbd_set_boot_protocol(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev);
        int rc = usb_hid_parse_report_descriptor(
            &hid_dev->report, USB_KBD_BOOT_REPORT_DESCRIPTOR,
            sizeof(USB_KBD_BOOT_REPORT_DESCRIPTOR));

        if (rc != EOK) {
                usb_log_error("Failed to parse boot report descriptor: %s\n",
                    str_error(rc));
                return rc;
        }

        rc = usbhid_req_set_protocol(
            usb_device_get_default_pipe(hid_dev->usb_dev),
            usb_device_get_iface_number(hid_dev->usb_dev),
            USB_HID_PROTOCOL_BOOT);

        if (rc != EOK) {
                usb_log_warning("Failed to set boot protocol to the device: "
                    "%s\n", str_error(rc));
                return rc;
        }

        return EOK;
}
/**
 * @}
 */