source: mainline/uspace/drv/usbhid/usbhid.c@ dcb7d7cd

/*
 * 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 driver API.
 */

#include <usb/debug.h>
#include <usb/classes/classes.h>
#include <usb/hid/hid.h>
#include <usb/hid/hidparser.h>
#include <usb/hid/hidreport.h>
#include <usb/hid/request.h>
#include <errno.h>
#include <str_error.h>

#include "usbhid.h"

#include "kbd/kbddev.h"
#include "generic/hiddev.h"
#include "mouse/mousedev.h"
#include "subdrivers.h"

/*----------------------------------------------------------------------------*/

/* Array of endpoints expected on the device, NULL terminated. */
usb_endpoint_description_t *usb_hid_endpoints[USB_HID_POLL_EP_COUNT + 1] = {
        &usb_hid_kbd_poll_endpoint_description,
        &usb_hid_mouse_poll_endpoint_description,
        &usb_hid_generic_poll_endpoint_description,
        NULL
};

static const int USB_HID_MAX_SUBDRIVERS = 10;

/** @todo What happens if this is not fibril local? */
//static fibril_local bool report_number;

/*----------------------------------------------------------------------------*/

static int usb_hid_set_boot_kbd_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL && hid_dev->subdriver_count == 0);
        
        hid_dev->subdrivers = (usb_hid_subdriver_t *)malloc(
            sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        
        // set the init callback
        hid_dev->subdrivers[0].init = usb_kbd_init;
        
        // set the polling callback
        hid_dev->subdrivers[0].poll = usb_kbd_polling_callback;
        
        // set the polling ended callback
        hid_dev->subdrivers[0].poll_end = NULL;
        
        // set the deinit callback
        hid_dev->subdrivers[0].deinit = usb_kbd_deinit;
        
        // set subdriver count
        hid_dev->subdriver_count = 1;
        
        return EOK;
}

/*----------------------------------------------------------------------------*/

static int usb_hid_set_boot_mouse_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL && hid_dev->subdriver_count == 0);
        
        hid_dev->subdrivers = (usb_hid_subdriver_t *)malloc(
            sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        
        // set the init callback
        hid_dev->subdrivers[0].init = usb_mouse_init;
        
        // set the polling callback
        hid_dev->subdrivers[0].poll = usb_mouse_polling_callback;
        
        // set the polling ended callback
        hid_dev->subdrivers[0].poll_end = NULL;
        
        // set the deinit callback
        hid_dev->subdrivers[0].deinit = usb_mouse_deinit;
        
        // set subdriver count
        hid_dev->subdriver_count = 1;
        
        return EOK;
}

/*----------------------------------------------------------------------------*/

static int usb_hid_set_generic_hid_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL && hid_dev->subdriver_count == 0);
        
        hid_dev->subdrivers = (usb_hid_subdriver_t *)malloc(
            sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        
        // set the init callback
        hid_dev->subdrivers[0].init = usb_generic_hid_init;
        
        // set the polling callback
        hid_dev->subdrivers[0].poll = usb_generic_hid_polling_callback;
        
        // set the polling ended callback
        hid_dev->subdrivers[0].poll_end = NULL;
        
        // set the deinit callback
        hid_dev->subdrivers[0].deinit = NULL;
        
        // set subdriver count
        hid_dev->subdriver_count = 1;
        
        return EOK;
}

/*----------------------------------------------------------------------------*/

static bool usb_hid_ids_match(usb_hid_dev_t *hid_dev, 
    const usb_hid_subdriver_mapping_t *mapping)
{
        assert(hid_dev != NULL);
        assert(hid_dev->usb_dev != NULL);
        
        return (hid_dev->usb_dev->descriptors.device.vendor_id 
            == mapping->vendor_id
            && hid_dev->usb_dev->descriptors.device.product_id 
            == mapping->product_id);
}

/*----------------------------------------------------------------------------*/

static bool usb_hid_path_matches(usb_hid_dev_t *hid_dev, 
    const usb_hid_subdriver_mapping_t *mapping)
{
        assert(hid_dev != NULL);
        assert(mapping != NULL);
        
        usb_hid_report_path_t *usage_path = usb_hid_report_path();
        if (usage_path == NULL) {
                usb_log_debug("Failed to create usage path.\n");
                return false;
        }
        int i = 0;
        while (mapping->usage_path[i].usage != 0 
            || mapping->usage_path[i].usage_page != 0) {
                if (usb_hid_report_path_append_item(usage_path, 
                    mapping->usage_path[i].usage_page, 
                    mapping->usage_path[i].usage) != EOK) {
                        usb_log_debug("Failed to append to usage path.\n");
                        usb_hid_report_path_free(usage_path);
                        return false;
                }
                ++i;
        }
        
        if (mapping->report_id >= 0) {
                usb_hid_report_path_set_report_id(usage_path, 
                    mapping->report_id);
        }
        
        assert(hid_dev->report != NULL);
        
        usb_log_debug("Compare flags: %d\n", mapping->compare);
//      size_t size = usb_hid_report_size(hid_dev->report, 0, 
//          USB_HID_REPORT_TYPE_INPUT);
        size_t size = 0;

        usb_hid_report_description_t *report_des = 
                usb_hid_report_find_description(hid_dev->report,
                mapping->report_id, USB_HID_REPORT_TYPE_INPUT);

        while(report_des != NULL) {

                if((mapping->report_id) == 0 && (report_des->report_id != 0)) {
                        usb_hid_report_path_set_report_id(usage_path,
                                report_des->report_id);
                }

                usb_hid_report_field_t *field = usb_hid_report_get_sibling (
                        hid_dev->report,
                        NULL, usage_path, mapping->compare, 
                        USB_HID_REPORT_TYPE_INPUT);

                while(field != NULL) {
                        size++;
                        field = usb_hid_report_get_sibling (hid_dev->report,
                                        field, usage_path, mapping->compare, 
                            USB_HID_REPORT_TYPE_INPUT);
                }

                if((mapping->report_id == 0) && (report_des->report_id != 0)) {
                        uint8_t report_id = usb_hid_get_next_report_id(
                                hid_dev->report, report_des->report_id,
                                USB_HID_REPORT_TYPE_INPUT);

                        if(report_id == 0) {
                                break;
                        }

                        report_des = usb_hid_report_find_description(
                                hid_dev->report, report_id, 
                                USB_HID_REPORT_TYPE_INPUT);
                }
                else {
                        break;
                }
        }
        
        usb_log_debug("Size of the input report: %zuB\n", size);
        usb_hid_report_path_free(usage_path);
        
        return (size > 0);
}

/*----------------------------------------------------------------------------*/

static int usb_hid_save_subdrivers(usb_hid_dev_t *hid_dev, 
    const usb_hid_subdriver_t **subdrivers, int count)
{
        int i;
        
        if (count <= 0) {
                hid_dev->subdriver_count = 0;
                hid_dev->subdrivers = NULL;
                return EOK;
        }
        
        // add one generic HID subdriver per device
        
        hid_dev->subdrivers = (usb_hid_subdriver_t *)malloc((count + 1) * 
            sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        
        for (i = 0; i < count; ++i) {
                hid_dev->subdrivers[i].init = subdrivers[i]->init;
                hid_dev->subdrivers[i].deinit = subdrivers[i]->deinit;
                hid_dev->subdrivers[i].poll = subdrivers[i]->poll;
                hid_dev->subdrivers[i].poll_end = subdrivers[i]->poll_end;
        }
        
        hid_dev->subdrivers[count].init = usb_generic_hid_init;
        hid_dev->subdrivers[count].poll = usb_generic_hid_polling_callback;
        hid_dev->subdrivers[count].deinit = NULL;
        hid_dev->subdrivers[count].poll_end = NULL;
        
        hid_dev->subdriver_count = count + 1;
        
        return EOK;
}

/*----------------------------------------------------------------------------*/

static int usb_hid_find_subdrivers(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);
        
        const usb_hid_subdriver_t *subdrivers[USB_HID_MAX_SUBDRIVERS];
        
        int i = 0, count = 0;
        const usb_hid_subdriver_mapping_t *mapping = &usb_hid_subdrivers[i];

        bool ids_matched;
        bool matched;
        
        while (count < USB_HID_MAX_SUBDRIVERS &&
            (mapping->usage_path != NULL
            || mapping->vendor_id >= 0 || mapping->product_id >= 0)) {
                // check the vendor & product ID
                if (mapping->vendor_id >= 0 && mapping->product_id < 0) {
                        usb_log_warning("Missing Product ID for Vendor ID %d\n",
                            mapping->vendor_id);
                        return EINVAL;
                }
                if (mapping->product_id >= 0 && mapping->vendor_id < 0) {
                        usb_log_warning("Missing Vendor ID for Product ID %d\n",
                            mapping->product_id);
                        return EINVAL;
                }
                
                ids_matched = false;
                matched = false;
                
                if (mapping->vendor_id >= 0) {
                        assert(mapping->product_id >= 0);
                        usb_log_debug("Comparing device against vendor ID %u"
                            " and product ID %u.\n", mapping->vendor_id,
                            mapping->product_id);
                        if (usb_hid_ids_match(hid_dev, mapping)) {
                                usb_log_debug("IDs matched.\n");
                                ids_matched = true;
                        }
                }
                
                if (mapping->usage_path != NULL) {
                        usb_log_debug("Comparing device against usage path.\n");
                        if (usb_hid_path_matches(hid_dev, mapping)) {
                                // does not matter if IDs were matched
                                matched = true;
                        }
                } else {
                        // matched only if IDs were matched and there is no path
                        matched = ids_matched;
                }
                
                if (matched) {
                        usb_log_debug("Subdriver matched.\n");
                        subdrivers[count++] = &mapping->subdriver;
                }
                
                mapping = &usb_hid_subdrivers[++i];
        }
        
        // we have all subdrivers determined, save them into the hid device
        return usb_hid_save_subdrivers(hid_dev, subdrivers, count);
}

/*----------------------------------------------------------------------------*/

static int usb_hid_check_pipes(usb_hid_dev_t *hid_dev, usb_device_t *dev)
{
        assert(hid_dev != NULL && dev != NULL);
        
        int rc = EOK;
        
        if (dev->pipes[USB_HID_KBD_POLL_EP_NO].present) {
                usb_log_debug("Found keyboard endpoint.\n");
                // save the pipe index
                hid_dev->poll_pipe_index = USB_HID_KBD_POLL_EP_NO;
        } else if (dev->pipes[USB_HID_MOUSE_POLL_EP_NO].present) {
                usb_log_debug("Found mouse endpoint.\n");
                // save the pipe index
                hid_dev->poll_pipe_index = USB_HID_MOUSE_POLL_EP_NO;
        } else if (dev->pipes[USB_HID_GENERIC_POLL_EP_NO].present) {
                usb_log_debug("Found generic HID endpoint.\n");
                // save the pipe index
                hid_dev->poll_pipe_index = USB_HID_GENERIC_POLL_EP_NO;
        } else {
                usb_log_error("None of supported endpoints found - probably"
                    " not a supported device.\n");
                rc = ENOTSUP;
        }
        
        return rc;
}

/*----------------------------------------------------------------------------*/

static int usb_hid_init_report(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL && hid_dev->report != NULL);
        
        uint8_t report_id = 0;
        size_t size;/* = usb_hid_report_byte_size(hid_dev->report, report_id, 
            USB_HID_REPORT_TYPE_INPUT);*/
        
        size_t max_size = 0;
        
        do {
                size = usb_hid_report_byte_size(hid_dev->report, report_id, 
                    USB_HID_REPORT_TYPE_INPUT);
                usb_log_debug("Report ID: %u, size: %zu\n", report_id, size);
                max_size = (size > max_size) ? size : max_size;
                report_id = usb_hid_get_next_report_id(hid_dev->report, 
                    report_id, USB_HID_REPORT_TYPE_INPUT);
        } while (report_id != 0);
        
        usb_log_debug("Max size of input report: %zu\n", max_size);
        
        hid_dev->max_input_report_size = max_size;
        assert(hid_dev->input_report == NULL);
        
        hid_dev->input_report = malloc(max_size);
        if (hid_dev->input_report == NULL) {
                return ENOMEM;
        }
        memset(hid_dev->input_report, 0, max_size);
        
        return EOK;
}

/*----------------------------------------------------------------------------*/

usb_hid_dev_t *usb_hid_new(void)
{
        usb_hid_dev_t *hid_dev = (usb_hid_dev_t *)calloc(1,
            sizeof(usb_hid_dev_t));
        
        if (hid_dev == NULL) {
                usb_log_fatal("No memory!\n");
                return NULL;
        }
        
        hid_dev->report = (usb_hid_report_t *)(malloc(sizeof(
            usb_hid_report_t)));
        if (hid_dev->report == NULL) {
                usb_log_fatal("No memory!\n");
                free(hid_dev);
                return NULL;
        }
        
        hid_dev->poll_pipe_index = -1;
        
        return hid_dev;
}

/*----------------------------------------------------------------------------*/

int usb_hid_init(usb_hid_dev_t *hid_dev, usb_device_t *dev)
{
        int rc, i;
        
        usb_log_debug("Initializing HID structure...\n");
        
        if (hid_dev == NULL) {
                usb_log_error("Failed to init HID structure: no structure given"
                    ".\n");
                return EINVAL;
        }
        
        if (dev == NULL) {
                usb_log_error("Failed to init HID structure: no USB device"
                    " given.\n");
                return EINVAL;
        }
        
        /* The USB device should already be initialized, save it in structure */
        hid_dev->usb_dev = dev;
        
        rc = usb_hid_check_pipes(hid_dev, dev);
        if (rc != EOK) {
                //usb_hid_free(&hid_dev);
                return rc;
        }
                
        /* Get the report descriptor and parse it. */
        rc = usb_hid_process_report_descriptor(hid_dev->usb_dev, 
            hid_dev->report, &hid_dev->report_desc, &hid_dev->report_desc_size);
        
        bool fallback = false;
        
        if (rc == EOK) {
                // try to find subdrivers that may want to handle this device
                rc = usb_hid_find_subdrivers(hid_dev);
                if (rc != EOK || hid_dev->subdriver_count == 0) {
                        // try to fall back to the boot protocol if available
                        usb_log_info("No subdrivers found to handle this"
                            " device.\n");
                        fallback = true;
                        assert(hid_dev->subdrivers == NULL);
                        assert(hid_dev->subdriver_count == 0);
                }
        } else {
                usb_log_error("Failed to parse Report descriptor.\n");
                // try to fall back to the boot protocol if available
                fallback = true;
        }
        
        if (fallback) {
                // fall back to boot protocol
                switch (hid_dev->poll_pipe_index) {
                case USB_HID_KBD_POLL_EP_NO:
                        usb_log_info("Falling back to kbd boot protocol.\n");
                        rc = usb_kbd_set_boot_protocol(hid_dev);
                        if (rc == EOK) {
                                rc = usb_hid_set_boot_kbd_subdriver(hid_dev);
                        }
                        break;
                case USB_HID_MOUSE_POLL_EP_NO:
                        usb_log_info("Falling back to mouse boot protocol.\n");
                        rc = usb_mouse_set_boot_protocol(hid_dev);
                        if (rc == EOK) {
                                rc = usb_hid_set_boot_mouse_subdriver(hid_dev);
                        }
                        break;
                default:
                        assert(hid_dev->poll_pipe_index 
                            == USB_HID_GENERIC_POLL_EP_NO);
                        
                        /* TODO: this has no meaning if the report descriptor
                                 is not parsed */
                        usb_log_info("Falling back to generic HID driver.\n");
                        rc = usb_hid_set_generic_hid_subdriver(hid_dev);
                }
        }
        
        if (rc != EOK) {
                usb_log_error("No subdriver for handling this device could be"
                    " initialized: %s.\n", str_error(rc));
                usb_log_debug("Subdriver count: %d\n", 
                    hid_dev->subdriver_count);
                //usb_hid_free(&hid_dev);
        } else {
                bool ok = false;
                
                usb_log_debug("Subdriver count: %d\n", 
                    hid_dev->subdriver_count);
                
                for (i = 0; i < hid_dev->subdriver_count; ++i) {
                        if (hid_dev->subdrivers[i].init != NULL) {
                                usb_log_debug("Initializing subdriver %d.\n",i);
                                rc = hid_dev->subdrivers[i].init(hid_dev,
                                    &hid_dev->subdrivers[i].data);
                                if (rc != EOK) {
                                        usb_log_warning("Failed to initialize"
                                            " HID subdriver structure.\n");
                                } else {
                                        // at least one subdriver initialized
                                        ok = true;
                                }
                        } else {
                                ok = true;
                        }
                }
                
                rc = (ok) ? EOK : -1;   // what error to report
        }
        
        // save max input report size and allocate space for the report
        rc = usb_hid_init_report(hid_dev);
        if (rc != EOK) {
                usb_log_error("Failed to initialize input report buffer.\n");
        }
        
        return rc;
}

/*----------------------------------------------------------------------------*/

bool usb_hid_polling_callback(usb_device_t *dev, uint8_t *buffer, 
    size_t buffer_size, void *arg)
{
        int i;
        
        if (dev == NULL || arg == NULL || buffer == NULL) {
                usb_log_error("Missing arguments to polling callback.\n");
                return false;
        }
        
        usb_hid_dev_t *hid_dev = (usb_hid_dev_t *)arg;
        
//      int allocated = (hid_dev->input_report != NULL);
        assert(hid_dev->input_report != NULL);
        usb_log_debug("Max input report size: %zu, buffer size: %zu\n",
            hid_dev->max_input_report_size, buffer_size);
        assert(hid_dev->max_input_report_size >= buffer_size);
        
//      if (/*!allocated*/
//          /*|| *//*hid_dev->input_report_size < buffer_size*/) {
//              uint8_t *input_old = hid_dev->input_report;
//              uint8_t *input_new = (uint8_t *)malloc(buffer_size);
                
//              if (input_new == NULL) {
//                      usb_log_error("Failed to allocate space for input "
//                          "buffer. This event may not be reported\n");
//                      memset(hid_dev->input_report, 0, 
//                          hid_dev->input_report_size);
//              } else {
//                      memcpy(input_new, input_old, 
//                          hid_dev->input_report_size);
//                      hid_dev->input_report = input_new;
//                      if (allocated) {
//                              free(input_old);
//                      }
//                      usb_hid_new_report();
//              }
//      }
        
        /*! @todo This should probably be atomic. */
        memcpy(hid_dev->input_report, buffer, buffer_size);
        hid_dev->input_report_size = buffer_size;
        usb_hid_new_report(hid_dev);
        
        bool cont = false;
        
        // continue if at least one of the subdrivers want to continue
        for (i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].poll != NULL
                    && hid_dev->subdrivers[i].poll(hid_dev, 
                        hid_dev->subdrivers[i].data, buffer, buffer_size)) {
                        cont = true;
                }
        }
        
        return cont;
}

/*----------------------------------------------------------------------------*/

void usb_hid_polling_ended_callback(usb_device_t *dev, bool reason, 
     void *arg)
{
        int i; 
        
        if (dev == NULL || arg == NULL) {
                return;
        }
        
        usb_hid_dev_t *hid_dev = (usb_hid_dev_t *)arg;
        
        for (i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].poll_end != NULL) {
                        hid_dev->subdrivers[i].poll_end(hid_dev,
                            hid_dev->subdrivers[i].data, reason);
                }
        }
        
        usb_hid_free(&hid_dev);
}

/*----------------------------------------------------------------------------*/

//const char *usb_hid_get_function_name(const usb_hid_dev_t *hid_dev)
//{
//      switch (hid_dev->poll_pipe_index) {
//      case USB_HID_KBD_POLL_EP_NO:
//              return HID_KBD_FUN_NAME;
//              break;
//      case USB_HID_MOUSE_POLL_EP_NO:
//              return HID_MOUSE_FUN_NAME;
//              break;
//      default:
//              return HID_GENERIC_FUN_NAME;
//      }
//}

/*----------------------------------------------------------------------------*/

//const char *usb_hid_get_class_name(const usb_hid_dev_t *hid_dev)
//{
//      // this means that only boot protocol keyboards will be connected
//      // to the console; there is probably no better way to do this
        
//      switch (hid_dev->poll_pipe_index) {
//      case USB_HID_KBD_POLL_EP_NO:
//              return HID_KBD_CLASS_NAME;
//              break;
//      case USB_HID_MOUSE_POLL_EP_NO:
//              return HID_MOUSE_CLASS_NAME;
//              break;
//      default:
//              return HID_GENERIC_CLASS_NAME;
//      }
//}

/*----------------------------------------------------------------------------*/

void usb_hid_new_report(usb_hid_dev_t *hid_dev)
{
        ++hid_dev->report_nr;
}

/*----------------------------------------------------------------------------*/

int usb_hid_report_number(usb_hid_dev_t *hid_dev)
{
        return hid_dev->report_nr;
}

/*----------------------------------------------------------------------------*/

//void usb_hid_report_received(void)
//{
//      ++report_number;
//}

/*----------------------------------------------------------------------------*/

//bool usb_hid_report_ready(void)
//{
//      return !report_received;
//}

/*----------------------------------------------------------------------------*/

void usb_hid_free(usb_hid_dev_t **hid_dev)
{
        int i;
        
        if (hid_dev == NULL || *hid_dev == NULL) {
                return;
        }
        
        usb_log_debug("Subdrivers: %p, subdriver count: %d\n", 
            (*hid_dev)->subdrivers, (*hid_dev)->subdriver_count);
        
        assert((*hid_dev)->subdrivers != NULL 
            || (*hid_dev)->subdriver_count == 0);
        
        for (i = 0; i < (*hid_dev)->subdriver_count; ++i) {
                if ((*hid_dev)->subdrivers[i].deinit != NULL) {
                        (*hid_dev)->subdrivers[i].deinit(*hid_dev,
                            (*hid_dev)->subdrivers[i].data);
                }
        }
        
        // free the subdrivers info
        if ((*hid_dev)->subdrivers != NULL) {
                free((*hid_dev)->subdrivers);
        }

        // destroy the parser
        if ((*hid_dev)->report != NULL) {
                usb_hid_free_report((*hid_dev)->report);
        }

        if ((*hid_dev)->report_desc != NULL) {
                free((*hid_dev)->report_desc);
        }

        free(*hid_dev);
        *hid_dev = NULL;
}

/**
 * @}
 */