source: mainline/uspace/drv/ohci/root_hub.c@ cee51fd

/*
 * Copyright (c) 2011 Jan Vesely
 * 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 drvusbohci
 * @{
 */
/** @file
 * @brief OHCI driver
 */
#include <assert.h>
#include <errno.h>
#include <str_error.h>

#include <usb/debug.h>

#include "root_hub.h"
#include "usb/classes/classes.h"
#include <usb/request.h>
#include <usb/classes/hub.h>

static const usb_standard_device_descriptor_t ohci_rh_device_descriptor =
{
                .configuration_count = 1,
                .descriptor_type = USB_DESCTYPE_DEVICE,
                .device_class = USB_CLASS_HUB,
                .device_protocol = 0,
                .device_subclass = 0,
                .device_version = 0,
                .length = sizeof(usb_standard_device_descriptor_t),
                /// \TODO this value is guessed
                .max_packet_size = 8,
                .vendor_id = 0x16db,
                .product_id = 0x0001,
                /// \TODO these values migt be different
                .str_serial_number = 0,
                .usb_spec_version = 0,
};

static const usb_standard_configuration_descriptor_t ohci_rh_conf_descriptor =
{
        /// \TODO some values are default or guessed
        .attributes = 1<<7,
        .configuration_number = 1,
        .descriptor_type = USB_DESCTYPE_CONFIGURATION,
        .interface_count = 1,
        .length = sizeof(usb_standard_configuration_descriptor_t),
        .max_power = 100,
        .str_configuration = 0,
};

static const usb_standard_interface_descriptor_t ohci_rh_iface_descriptor =
{
        .alternate_setting = 0,
        .descriptor_type = USB_DESCTYPE_INTERFACE,
        .endpoint_count = 1,
        .interface_class = USB_CLASS_HUB,
        /// \TODO is this correct?
        .interface_number = 1,
        .interface_protocol = 0,
        .interface_subclass = 0,
        .length = sizeof(usb_standard_interface_descriptor_t),
        .str_interface = 0,
};

static const usb_standard_endpoint_descriptor_t ohci_rh_ep_descriptor =
{
        .attributes = USB_TRANSFER_INTERRUPT,
        .descriptor_type = USB_DESCTYPE_ENDPOINT,
        .endpoint_address = 1 + (1<<7),
        .length = sizeof(usb_standard_endpoint_descriptor_t),
        .max_packet_size = 8,
        .poll_interval = 255,
};

/** Root hub initialization
 * @return Error code.
 */
int rh_init(rh_t *instance, ddf_dev_t *dev, ohci_regs_t *regs)
{
        assert(instance);
        instance->address = -1;
        instance->registers = regs;
        instance->device = dev;


        usb_log_info("OHCI root hub with %d ports.\n", regs->rh_desc_a & 0xff);

        //start generic usb hub driver
        
        /* TODO: implement */
        return EOK;
}
/*----------------------------------------------------------------------------*/

/**
 * create answer to port status_request
 *
 * Copy content of corresponding port status register to answer buffer.
 *
 * @param instance root hub instance
 * @param port port number, counted from 1
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_get_port_status_request(rh_t *instance, uint16_t port,
                usb_transfer_batch_t * request){
        if(port<1 || port>instance->port_count)
                return EINVAL;
        uint32_t * uint32_buffer = (uint32_t*)request->buffer;
        request->transfered_size = 4;
        uint32_buffer[0] = instance->registers->rh_port_status[port -1];
        return EOK;
}

/**
 * create answer to port status_request
 *
 * Copy content of hub status register to answer buffer.
 *
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_get_hub_status_request(rh_t *instance,
                usb_transfer_batch_t * request){
        uint32_t * uint32_buffer = (uint32_t*)request->buffer;
        //bits, 0,1,16,17
        request->transfered_size = 4;
        uint32_t mask = 1 & (1<<1) & (1<<16) & (1<<17);
        uint32_buffer[0] = mask & instance->registers->rh_status;
        return EOK;

}

/**
 * Create hub descriptor used in hub-driver <-> hub communication
 * 
 * This means creating byt array from data in root hub registers. For more
 * info see usb hub specification.
 *
 * @param instance root hub instance
 * @param@out out_result pointer to resultant serialized descriptor
 * @param@out out_size size of serialized descriptor
 */
static void usb_create_serialized_hub_descriptor(rh_t *instance,
                uint8_t ** out_result,
                size_t * out_size) {
        //base size
        size_t size = 7;
        //variable size according to port count
        size_t var_size = instance->port_count / 8 +
                        ((instance->port_count % 8 > 0) ? 1 : 0);
        size += 2 * var_size;
        uint8_t * result = (uint8_t*) malloc(size);
        bzero(result,size);
        //size
        result[0] = size;
        //descriptor type
        result[1] = USB_DESCTYPE_HUB;
        result[2] = instance->port_count;
        uint32_t hub_desc_reg = instance->registers->rh_desc_a;
        result[3] = 
                        ((hub_desc_reg >> 8) %2) +
                        (((hub_desc_reg >> 9) %2) << 1) +
                        (((hub_desc_reg >> 10) %2) << 2) +
                        (((hub_desc_reg >> 11) %2) << 3) +
                        (((hub_desc_reg >> 12) %2) << 4);
        result[4] = 0;
        result[5] = /*descriptor->pwr_on_2_good_time*/ 50;
        result[6] = 50;

        int port;
        for (port = 1; port <= instance->port_count; ++port) {
                result[7 + port/8] +=
                                ((instance->registers->rh_desc_b >> port)%2) << (port%8);
        }
        size_t i;
        for (i = 0; i < var_size; ++i) {
                result[7 + var_size + i] = 255;
        }
        (*out_result) = result;
        (*out_size) = size;
}


/**
 * create answer to status request
 *
 * This might be either hub status or port status request. If neither,
 * ENOTSUP is returned.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_get_status_request(rh_t *instance,
                usb_transfer_batch_t * request)
{
        size_t buffer_size = request->buffer_size;
        usb_device_request_setup_packet_t * request_packet =
                        (usb_device_request_setup_packet_t*)
                        request->setup_buffer;

        usb_hub_bm_request_type_t request_type = request_packet->request_type;
        if(buffer_size<4/*request_packet->length*/){///\TODO
                usb_log_warning("requested more data than buffer size\n");
                return EINVAL;
        }

        if(request_type == USB_HUB_REQ_TYPE_GET_HUB_STATUS)
                return process_get_hub_status_request(instance, request);
        if(request_type == USB_HUB_REQ_TYPE_GET_PORT_STATUS)
                return process_get_port_status_request(instance, request_packet->index,
                                request);
        return ENOTSUP;
}

/**
 * create answer to status interrupt consisting of change bitmap
 *
 * Result contains bitmap where bit 0 indicates change on hub and
 * bit i indicates change on i`th port (i>0). For more info see
 * Hub and Port status bitmap specification in USB specification.
 * @param instance root hub instance
 * @param@out buffer pointer to created interrupt mas
 * @param@out buffer_size size of created interrupt mask
 */
static void create_interrupt_mask(rh_t *instance, void ** buffer,
                size_t * buffer_size){
        int bit_count = instance->port_count + 1;
        (*buffer_size) = (bit_count / 8) + (bit_count%8==0)?0:1;
        (*buffer) = malloc(*buffer_size);
        uint8_t * bitmap = (uint8_t*)(*buffer);
        uint32_t mask = (1<<16) + (1<<17);
        bzero(bitmap,(*buffer_size));
        if(instance->registers->rh_status & mask){
                bitmap[0] = 1;
        }
        int port;
        mask = 0;
        int i;
        for(i=16;i<=20;++i)
                mask += 1<<i;
        for(port = 1; port<=instance->port_count;++port){
                if(mask & instance->registers->rh_port_status[port-1]){
                        bitmap[(port+1)/8] += 1<<(port%8);
                }
        }
}

/**
 * create standard device descriptor for a hub
 * @return newly allocated descriptor
 */
static usb_standard_device_descriptor_t *
        usb_ohci_rh_create_standard_device_descriptor(){
        usb_standard_device_descriptor_t * descriptor =
                                (usb_standard_device_descriptor_t*)
                                malloc(sizeof(usb_standard_device_descriptor_t));
        descriptor->configuration_count = 1;
        descriptor->descriptor_type = USB_DESCTYPE_DEVICE;
        descriptor->device_class = USB_CLASS_HUB;
        descriptor->device_protocol = 0;
        descriptor->device_subclass = 0;
        descriptor->device_version = 0;
        descriptor->length = sizeof(usb_standard_device_descriptor_t);
        /// \TODO this value is guessed
        descriptor->max_packet_size = 8;
        descriptor->product_id = 0x0001;
        /// \TODO these values migt be different
        descriptor->str_serial_number = 0;
        descriptor->str_serial_number = 0;
        descriptor->usb_spec_version = 0;
        descriptor->vendor_id = 0x16db;
        return descriptor;
}

/**
 * create standart configuration descriptor for the root hub instance
 * @param instance root hub instance
 * @return newly allocated descriptor
 */
static usb_standard_configuration_descriptor_t *
usb_ohci_rh_create_standart_configuration_descriptor(rh_t *instance){
        usb_standard_configuration_descriptor_t * descriptor =
                        (usb_standard_configuration_descriptor_t*)
                        malloc(sizeof(usb_standard_configuration_descriptor_t));
        /// \TODO some values are default or guessed
        descriptor->attributes = 1<<7;
        descriptor->configuration_number = 1;
        descriptor->descriptor_type = USB_DESCTYPE_CONFIGURATION;
        descriptor->interface_count = 1;
        descriptor->length = sizeof(usb_standard_configuration_descriptor_t);
        descriptor->max_power = 100;
        descriptor->str_configuration = 0;
        /// \TODO should this include device descriptor?
        size_t hub_descriptor_size = 7 +
                        2* (instance->port_count / 8 +
                        ((instance->port_count % 8 > 0) ? 1 : 0));
        descriptor->total_length =
                        sizeof(usb_standard_configuration_descriptor_t)+
                        sizeof(usb_standard_endpoint_descriptor_t)+
                        sizeof(usb_standard_interface_descriptor_t)+
                        hub_descriptor_size;
        return descriptor;
}

/**
 * create standard interface descriptor for a root hub
 * @return newly allocated descriptor
 */
static usb_standard_interface_descriptor_t *
usb_ohci_rh_create_standard_interface_descriptor(){
        usb_standard_interface_descriptor_t * descriptor =
                                (usb_standard_interface_descriptor_t*)
                                malloc(sizeof(usb_standard_interface_descriptor_t));
        descriptor->alternate_setting = 0;
        descriptor->descriptor_type = USB_DESCTYPE_INTERFACE;
        descriptor->endpoint_count = 1;
        descriptor->interface_class = USB_CLASS_HUB;
        /// \TODO is this correct?
        descriptor->interface_number = 1;
        descriptor->interface_protocol = 0;
        descriptor->interface_subclass = 0;
        descriptor->length = sizeof(usb_standard_interface_descriptor_t);
        descriptor->str_interface = 0;
        return descriptor;
}

/**
 * create standard endpoint descriptor for a root hub
 * @return newly allocated descriptor
 */
static usb_standard_endpoint_descriptor_t *
usb_ohci_rh_create_standard_endpoint_descriptor(){
        usb_standard_endpoint_descriptor_t * descriptor =
                        (usb_standard_endpoint_descriptor_t*)
                        malloc(sizeof(usb_standard_endpoint_descriptor_t));
        descriptor->attributes = USB_TRANSFER_INTERRUPT;
        descriptor->descriptor_type = USB_DESCTYPE_ENDPOINT;
        descriptor->endpoint_address = 1 + (1<<7);
        descriptor->length = sizeof(usb_standard_endpoint_descriptor_t);
        descriptor->max_packet_size = 8;
        descriptor->poll_interval = 255;
        return descriptor;
}

/**
 * create answer to a descriptor request
 *
 * This might be a request for standard (configuration, device, endpoint or
 * interface) or device specific (hub) descriptor.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_get_descriptor_request(rh_t *instance,
                usb_transfer_batch_t *request){
        usb_device_request_setup_packet_t * setup_request =
                        (usb_device_request_setup_packet_t*)request->setup_buffer;
        size_t size;
        const void * result_descriptor = NULL;
        const uint16_t setup_request_value = setup_request->value_high;
                        //(setup_request->value_low << 8);
#if 0
        bool del = false;
        //this code was merged from development and has to be reviewed
        switch (setup_request_value)
        {
        case USB_DESCTYPE_HUB: {
                uint8_t * descriptor;
                usb_create_serialized_hub_descriptor(
                    instance, &descriptor, &size);
                result_descriptor = descriptor;
                break;
        }
        case USB_DESCTYPE_DEVICE: {
                usb_log_debug("USB_DESCTYPE_DEVICE\n");
                result_descriptor = &ohci_rh_device_descriptor;
                size = sizeof(ohci_rh_device_descriptor);
                break;
        }
        case USB_DESCTYPE_CONFIGURATION: {
                usb_log_debug("USB_DESCTYPE_CONFIGURATION\n");
                usb_standard_configuration_descriptor_t * descriptor =
                                malloc(sizeof(usb_standard_configuration_descriptor_t));
                memcpy(descriptor, &ohci_rh_conf_descriptor,
                    sizeof(usb_standard_configuration_descriptor_t));
                /// \TODO should this include device descriptor?
                const size_t hub_descriptor_size = 7 +
                                2* (instance->port_count / 8 +
                                ((instance->port_count % 8 > 0) ? 1 : 0));
                descriptor->total_length =
                                sizeof(usb_standard_configuration_descriptor_t)+
                                sizeof(usb_standard_endpoint_descriptor_t)+
                                sizeof(usb_standard_interface_descriptor_t)+
                                hub_descriptor_size;
                result_descriptor = descriptor;
                size = sizeof(usb_standard_configuration_descriptor_t);
                del = true;
                break;
        }
        case USB_DESCTYPE_INTERFACE: {
                usb_log_debug("USB_DESCTYPE_INTERFACE\n");
                result_descriptor = &ohci_rh_iface_descriptor;
                size = sizeof(ohci_rh_iface_descriptor);
                break;
        }
        case USB_DESCTYPE_ENDPOINT: {
                usb_log_debug("USB_DESCTYPE_ENDPOINT\n");
                result_descriptor = &ohci_rh_ep_descriptor;
                size = sizeof(ohci_rh_ep_descriptor);
                break;
        }
        default: {
                usb_log_debug("USB_DESCTYPE_EINVAL %d \n",setup_request->value);
                usb_log_debug("\ttype %d\n\trequest %d\n\tvalue %d\n\tindex %d\n\tlen %d\n ",
                                setup_request->request_type,
                                setup_request->request,
                                setup_request_value,
                                setup_request->index,
                                setup_request->length
                                );
                return EINVAL;
        }
        }
#endif
        if(setup_request_value == USB_DESCTYPE_HUB){
                usb_log_debug("USB_DESCTYPE_HUB\n");
                //create hub descriptor
                uint8_t * descriptor;
                usb_create_serialized_hub_descriptor(instance, 
                                &descriptor, &size);
                result_descriptor = descriptor;
        }else if(setup_request_value == USB_DESCTYPE_DEVICE){
                //create std device descriptor
                usb_log_debug("USB_DESCTYPE_DEVICE\n");
                result_descriptor =
                                usb_ohci_rh_create_standard_device_descriptor();
                size = sizeof(usb_standard_device_descriptor_t);
        }else if(setup_request_value == USB_DESCTYPE_CONFIGURATION){
                usb_log_debug("USB_DESCTYPE_CONFIGURATION\n");
                result_descriptor =
                                usb_ohci_rh_create_standart_configuration_descriptor(instance);
                size = sizeof(usb_standard_configuration_descriptor_t);

        }else if(setup_request_value == USB_DESCTYPE_INTERFACE){
                usb_log_debug("USB_DESCTYPE_INTERFACE\n");
                result_descriptor =
                                usb_ohci_rh_create_standard_interface_descriptor();
                size = sizeof(usb_standard_interface_descriptor_t);
        }else if(setup_request_value == USB_DESCTYPE_ENDPOINT){
                usb_log_debug("USB_DESCTYPE_ENDPOINT\n");
                result_descriptor =
                                usb_ohci_rh_create_standard_endpoint_descriptor();
                size = sizeof(usb_standard_endpoint_descriptor_t);
        }else{
                usb_log_debug("USB_DESCTYPE_EINVAL %d \n",setup_request->value);
                usb_log_debug("\ttype %d\n\trequest %d\n\tvalue %d\n\tindex %d\n\tlen %d\n ",
                                setup_request->request_type,
                                setup_request->request,
                                setup_request_value,
                                setup_request->index,
                                setup_request->length
                                );
                return EINVAL;
        }
        if(request->buffer_size < size){
                size = request->buffer_size;
        }
        request->transfered_size = size;
        memcpy(request->buffer,result_descriptor,size);
        if (result_descriptor)
                free(result_descriptor);
        return EOK;
}

/**
 * answer to get configuration request
 *
 * Root hub works independently on the configuration.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_get_configuration_request(rh_t *instance, 
                usb_transfer_batch_t *request){
        //set and get configuration requests do not have any meaning, only dummy
        //values are returned
        if(request->buffer_size != 1)
                return EINVAL;
        request->buffer[0] = 1;
        request->transfered_size = 1;
        return EOK;
}

/**
 * process feature-enabling/disabling request on hub
 * 
 * @param instance root hub instance
 * @param feature feature selector
 * @param enable enable or disable specified feature
 * @return error code
 */
static int process_hub_feature_set_request(rh_t *instance,
                uint16_t feature, bool enable){
        if(feature > USB_HUB_FEATURE_C_HUB_OVER_CURRENT)
                return EINVAL;
        instance->registers->rh_status =
                        enable ?
                        (instance->registers->rh_status | (1<<feature))
                        :
                        (instance->registers->rh_status & (~(1<<feature)));
        /// \TODO any error?
        return EOK;
}

/**
 * process feature-enabling/disabling request on hub
 * 
 * @param instance root hub instance
 * @param feature feature selector
 * @param port port number, counted from 1
 * @param enable enable or disable the specified feature
 * @return error code
 */
static int process_port_feature_set_request(rh_t *instance,
                uint16_t feature, uint16_t port, bool enable){
        if(feature > USB_HUB_FEATURE_C_PORT_RESET)
                return EINVAL;
        if(port<1 || port>instance->port_count)
                return EINVAL;
        instance->registers->rh_port_status[port - 1] =
                        enable ?
                        (instance->registers->rh_port_status[port - 1] | (1<<feature))
                        :
                        (instance->registers->rh_port_status[port - 1] & (~(1<<feature)));
        /// \TODO any error?
        return EOK;
}

/**
 * register address to this device
 * 
 * @param instance root hub instance
 * @param address new address
 * @return error code
 */
static int process_address_set_request(rh_t *instance,
                uint16_t address){
        instance->address = address;
        return EOK;
}

/**
 * process one of requests that requere output data
 *
 * Request can be one of USB_DEVREQ_GET_STATUS, USB_DEVREQ_GET_DESCRIPTOR or
 * USB_DEVREQ_GET_CONFIGURATION.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_request_with_output(rh_t *instance,
                usb_transfer_batch_t *request){
        usb_device_request_setup_packet_t * setup_request =
                        (usb_device_request_setup_packet_t*)request->setup_buffer;
        if(setup_request->request == USB_DEVREQ_GET_STATUS){
                usb_log_debug("USB_DEVREQ_GET_STATUS\n");
                return process_get_status_request(instance, request);
        }
        if(setup_request->request == USB_DEVREQ_GET_DESCRIPTOR){
                usb_log_debug("USB_DEVREQ_GET_DESCRIPTOR\n");
                return process_get_descriptor_request(instance, request);
        }
        if(setup_request->request == USB_DEVREQ_GET_CONFIGURATION){
                usb_log_debug("USB_DEVREQ_GET_CONFIGURATION\n");
                return process_get_configuration_request(instance, request);
        }
        return ENOTSUP;
}

/**
 * process one of requests that carry input data
 *
 * Request can be one of USB_DEVREQ_SET_DESCRIPTOR or
 * USB_DEVREQ_SET_CONFIGURATION.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_request_with_input(rh_t *instance,
                usb_transfer_batch_t *request){
        usb_device_request_setup_packet_t * setup_request =
                        (usb_device_request_setup_packet_t*)request->setup_buffer;
        request->transfered_size = 0;
        if(setup_request->request == USB_DEVREQ_SET_DESCRIPTOR){
                return ENOTSUP;
        }
        if(setup_request->request == USB_DEVREQ_SET_CONFIGURATION){
                //set and get configuration requests do not have any meaning,
                //only dummy values are returned
                return EOK;
        }
        return ENOTSUP;
}

/**
 * process one of requests that do not request nor carry additional data
 *
 * Request can be one of USB_DEVREQ_CLEAR_FEATURE, USB_DEVREQ_SET_FEATURE or
 * USB_DEVREQ_SET_ADDRESS.
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_request_without_data(rh_t *instance,
                usb_transfer_batch_t *request){
        usb_device_request_setup_packet_t * setup_request =
                        (usb_device_request_setup_packet_t*)request->setup_buffer;
        request->transfered_size = 0;
        if(setup_request->request == USB_DEVREQ_CLEAR_FEATURE
                                || setup_request->request == USB_DEVREQ_SET_FEATURE){
                if(setup_request->request_type == USB_HUB_REQ_TYPE_SET_HUB_FEATURE){
                        usb_log_debug("USB_HUB_REQ_TYPE_SET_HUB_FEATURE\n");
                        return process_hub_feature_set_request(instance, setup_request->value,
                                        setup_request->request == USB_DEVREQ_SET_FEATURE);
                }
                if(setup_request->request_type == USB_HUB_REQ_TYPE_SET_PORT_FEATURE){
                        usb_log_debug("USB_HUB_REQ_TYPE_SET_PORT_FEATURE\n");
                        return process_port_feature_set_request(instance, setup_request->value,
                                        setup_request->index,
                                        setup_request->request == USB_DEVREQ_SET_FEATURE);
                }
                usb_log_debug("USB_HUB_REQ_TYPE_INVALID %d\n",setup_request->request_type);
                return EINVAL;
        }
        if(setup_request->request == USB_DEVREQ_SET_ADDRESS){
                usb_log_debug("USB_DEVREQ_SET_ADDRESS\n");
                return process_address_set_request(instance, setup_request->value);
        }
        usb_log_debug("USB_DEVREQ_SET_ENOTSUP %d\n",setup_request->request_type);
        return ENOTSUP;
}

/**
 * process hub control request
 *
 * If needed, writes answer into the request structure.
 * Request can be one of
 * USB_DEVREQ_GET_STATUS,
 * USB_DEVREQ_GET_DESCRIPTOR,
 * USB_DEVREQ_GET_CONFIGURATION,
 * USB_DEVREQ_CLEAR_FEATURE,
 * USB_DEVREQ_SET_FEATURE,
 * USB_DEVREQ_SET_ADDRESS,
 * USB_DEVREQ_SET_DESCRIPTOR or
 * USB_DEVREQ_SET_CONFIGURATION.
 *
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
static int process_ctrl_request(rh_t *instance, usb_transfer_batch_t *request){
        int opResult;
        if (request->setup_buffer) {
                if(sizeof(usb_device_request_setup_packet_t)>request->setup_size){
                        usb_log_error("setup packet too small\n");
                        return EINVAL;
                }
                usb_log_info("CTRL packet: %s.\n",
                        usb_debug_str_buffer((const uint8_t *)request->setup_buffer, 8, 8));
                usb_device_request_setup_packet_t * setup_request =
                                (usb_device_request_setup_packet_t*)request->setup_buffer;
                if(
                        setup_request->request == USB_DEVREQ_GET_STATUS
                        || setup_request->request == USB_DEVREQ_GET_DESCRIPTOR
                        || setup_request->request == USB_DEVREQ_GET_CONFIGURATION
                ){
                        usb_log_debug("processing request with output\n");
                        opResult = process_request_with_output(instance,request);
                }else if(
                        setup_request->request == USB_DEVREQ_CLEAR_FEATURE
                        || setup_request->request == USB_DEVREQ_SET_FEATURE
                        || setup_request->request == USB_DEVREQ_SET_ADDRESS
                ){
                        usb_log_debug("processing request without additional data\n");
                        opResult = process_request_without_data(instance,request);
                }else if(setup_request->request == USB_DEVREQ_SET_DESCRIPTOR
                                || setup_request->request == USB_DEVREQ_SET_CONFIGURATION
                ){
                        usb_log_debug("processing request with input\n");
                        opResult = process_request_with_input(instance,request);
                }else{
                        usb_log_warning("received unsuported request: %d\n",
                                        setup_request->request
                                        );
                        opResult = ENOTSUP;
                }
        }else{
                usb_log_error("root hub received empty transaction?");
                opResult = EINVAL;
        }
        return opResult;
}

/**
 * process root hub request
 *
 * @param instance root hub instance
 * @param request structure containing both request and response information
 * @return error code
 */
int rh_request(rh_t *instance, usb_transfer_batch_t *request)
{
        assert(instance);
        assert(request);
        int opResult;
        if(request->transfer_type == USB_TRANSFER_CONTROL){
                usb_log_info("Root hub got CONTROL packet\n");
                opResult = process_ctrl_request(instance,request);
        }else if(request->transfer_type == USB_TRANSFER_INTERRUPT){
                usb_log_info("Root hub got INTERRUPT packet\n");
                void * buffer;
                create_interrupt_mask(instance, &buffer,
                        &(request->transfered_size));
                memcpy(request->transport_buffer,buffer, request->transfered_size);
                opResult = EOK;
        }else{
                opResult = EINVAL;
        }
        usb_transfer_batch_finish(request, opResult);
        return EOK;
}
/*----------------------------------------------------------------------------*/


void rh_interrupt(rh_t *instance)
{
        usb_log_info("Whoa whoa wait, I`m not supposed to receive interrupts, am I?\n");
        /* TODO: implement? */
}
/**
 * @}
 */