source: mainline/uspace/lib/usbhost/src/ddf_helpers.c@ a53ed3a

/*
 * Copyright (c) 2013 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 libusbhost
 * @{
 */
/** @file
 *
 */

#include <usb/classes/classes.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/request.h>
#include <usb/usb.h>

#include <adt/list.h>
#include <assert.h>
#include <async.h>
#include <ddf/driver.h>
#include <ddf/interrupt.h>
#include <device/hw_res_parsed.h>
#include <errno.h>
#include <fibril_synch.h>
#include <macros.h>
#include <stdio.h>
#include <stdlib.h>
#include <str_error.h>
#include <usb_iface.h>

#include "ddf_helpers.h"

#define CTRL_PIPE_MIN_PACKET_SIZE 8

typedef struct usb_dev {
        link_t link;
        list_t devices;
        fibril_mutex_t guard;
        ddf_fun_t *fun;
        usb_address_t address;
        usb_speed_t speed;
        usb_address_t tt_address;
        unsigned port;
} usb_dev_t;

typedef struct hc_dev {
        ddf_fun_t *ctl_fun;
        hcd_t hcd;
        usb_dev_t *root_hub;
} hc_dev_t;

static hc_dev_t *dev_to_hc_dev(ddf_dev_t *dev)
{
        return ddf_dev_data_get(dev);
}

hcd_t *dev_to_hcd(ddf_dev_t *dev)
{
        hc_dev_t *hc_dev = dev_to_hc_dev(dev);
        if (!hc_dev) {
                usb_log_error("Invalid HCD device.\n");
                return NULL;
        }
        return &hc_dev->hcd;
}


static errno_t hcd_ddf_new_device(ddf_dev_t *device, usb_dev_t *hub, unsigned port);
static errno_t hcd_ddf_remove_device(ddf_dev_t *device, usb_dev_t *hub, unsigned port);


/* DDF INTERFACE */

/** Register endpoint interface function.
 * @param fun DDF function.
 * @param address USB address of the device.
 * @param endpoint USB endpoint number to be registered.
 * @param transfer_type Endpoint's transfer type.
 * @param direction USB communication direction the endpoint is capable of.
 * @param max_packet_size Maximu size of packets the endpoint accepts.
 * @param interval Preferred timeout between communication.
 * @return Error code.
 */
static errno_t register_endpoint(
    ddf_fun_t *fun, usb_endpoint_t endpoint,
    usb_transfer_type_t transfer_type, usb_direction_t direction,
    size_t max_packet_size, unsigned packets, unsigned interval)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);
        const size_t size = max_packet_size;
        const usb_target_t target =
            {{.address = dev->address, .endpoint = endpoint}};

        usb_log_debug("Register endpoint %d:%d %s-%s %zuB %ums.\n",
            dev->address, endpoint, usb_str_transfer_type(transfer_type),
            usb_str_direction(direction), max_packet_size, interval);

        return hcd_add_ep(hcd, target, direction, transfer_type,
            max_packet_size, packets, size, dev->tt_address, dev->port);
}

/** Unregister endpoint interface function.
 * @param fun DDF function.
 * @param address USB address of the endpoint.
 * @param endpoint USB endpoint number.
 * @param direction Communication direction of the enpdoint to unregister.
 * @return Error code.
 */
static errno_t unregister_endpoint(
    ddf_fun_t *fun, usb_endpoint_t endpoint, usb_direction_t direction)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);
        const usb_target_t target =
            {{.address = dev->address, .endpoint = endpoint}};
        usb_log_debug("Unregister endpoint %d:%d %s.\n",
            dev->address, endpoint, usb_str_direction(direction));
        return hcd_remove_ep(hcd, target, direction);
}

static errno_t reserve_default_address(ddf_fun_t *fun, usb_speed_t speed)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);

        usb_log_debug("Device %d requested default address at %s speed\n",
            dev->address, usb_str_speed(speed));
        return hcd_reserve_default_address(hcd, speed);
}

static errno_t release_default_address(ddf_fun_t *fun)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);

        usb_log_debug("Device %d released default address\n", dev->address);
        return hcd_release_default_address(hcd);
}

static errno_t device_enumerate(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *ddf_dev = ddf_fun_get_dev(fun);
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(ddf_dev);
        assert(dev);
        usb_log_debug("Hub %d reported a new USB device on port: %u\n",
            dev->address, port);
        return hcd_ddf_new_device(ddf_dev, dev, port);
}

static errno_t device_remove(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *ddf_dev = ddf_fun_get_dev(fun);
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(ddf_dev);
        assert(dev);
        usb_log_debug("Hub `%s' reported removal of device on port %u\n",
            ddf_fun_get_name(fun), port);
        return hcd_ddf_remove_device(ddf_dev, dev, port);
}

/** Gets handle of the respective device.
 *
 * @param[in] fun Device function.
 * @param[out] handle Place to write the handle.
 * @return Error code.
 */
static errno_t get_my_device_handle(ddf_fun_t *fun, devman_handle_t *handle)
{
        assert(fun);
        if (handle)
                *handle = ddf_fun_get_handle(fun);
        return EOK;
}

/** Inbound communication interface function.
 * @param fun DDF function.
 * @param target Communication target.
 * @param setup_data Data to use in setup stage (control transfers).
 * @param data Pointer to data buffer.
 * @param size Size of the data buffer.
 * @param callback Function to call on communication end.
 * @param arg Argument passed to the callback function.
 * @return Error code.
 */
static errno_t dev_read(ddf_fun_t *fun, usb_endpoint_t endpoint,
    uint64_t setup_data, uint8_t *data, size_t size,
    usbhc_iface_transfer_in_callback_t callback, void *arg)
{
        assert(fun);
        usb_dev_t *usb_dev = ddf_fun_data_get(fun);
        assert(usb_dev);
        const usb_target_t target = {{
            .address =  usb_dev->address,
            .endpoint = endpoint,
        }};
        return hcd_send_batch(dev_to_hcd(ddf_fun_get_dev(fun)), target,
            USB_DIRECTION_IN, data, size, setup_data, callback, NULL, arg,
            "READ");
}

/** Outbound communication interface function.
 * @param fun DDF function.
 * @param target Communication target.
 * @param setup_data Data to use in setup stage (control transfers).
 * @param data Pointer to data buffer.
 * @param size Size of the data buffer.
 * @param callback Function to call on communication end.
 * @param arg Argument passed to the callback function.
 * @return Error code.
 */
static errno_t dev_write(ddf_fun_t *fun, usb_endpoint_t endpoint,
    uint64_t setup_data, const uint8_t *data, size_t size,
    usbhc_iface_transfer_out_callback_t callback, void *arg)
{
        assert(fun);
        usb_dev_t *usb_dev = ddf_fun_data_get(fun);
        assert(usb_dev);
        const usb_target_t target = {{
            .address =  usb_dev->address,
            .endpoint = endpoint,
        }};
        return hcd_send_batch(dev_to_hcd(ddf_fun_get_dev(fun)),
            target, USB_DIRECTION_OUT, (uint8_t*)data, size, setup_data, NULL,
            callback, arg, "WRITE");
}

/** USB device interface */
static usb_iface_t usb_iface = {
        .get_my_device_handle = get_my_device_handle,

        .reserve_default_address = reserve_default_address,
        .release_default_address = release_default_address,

        .device_enumerate = device_enumerate,
        .device_remove = device_remove,

        .register_endpoint = register_endpoint,
        .unregister_endpoint = unregister_endpoint,

        .read = dev_read,
        .write = dev_write,
};

/** Standard USB device interface) */
static ddf_dev_ops_t usb_ops = {
        .interfaces[USB_DEV_IFACE] = &usb_iface,
};


/* DDF HELPERS */

#define GET_DEVICE_DESC(size) \
{ \
        .request_type = SETUP_REQUEST_TYPE_DEVICE_TO_HOST \
            | (USB_REQUEST_TYPE_STANDARD << 5) \
            | USB_REQUEST_RECIPIENT_DEVICE, \
        .request = USB_DEVREQ_GET_DESCRIPTOR, \
        .value = uint16_host2usb(USB_DESCTYPE_DEVICE << 8), \
        .index = uint16_host2usb(0), \
        .length = uint16_host2usb(size), \
};

#define SET_ADDRESS(address) \
{ \
        .request_type = SETUP_REQUEST_TYPE_HOST_TO_DEVICE \
            | (USB_REQUEST_TYPE_STANDARD << 5) \
            | USB_REQUEST_RECIPIENT_DEVICE, \
        .request = USB_DEVREQ_SET_ADDRESS, \
        .value = uint16_host2usb(address), \
        .index = uint16_host2usb(0), \
        .length = uint16_host2usb(0), \
};

static errno_t hcd_ddf_add_device(ddf_dev_t *parent, usb_dev_t *hub_dev,
    unsigned port, usb_address_t address, usb_speed_t speed, const char *name,
    const match_id_list_t *mids)
{
        assert(parent);

        char default_name[10] = { 0 }; /* usbxyz-ss */
        if (!name) {
                snprintf(default_name, sizeof(default_name) - 1,
                    "usb%u-%cs", address, usb_str_speed(speed)[0]);
                name = default_name;
        }

        ddf_fun_t *fun = ddf_fun_create(parent, fun_inner, name);
        if (!fun)
                return ENOMEM;
        usb_dev_t *info = ddf_fun_data_alloc(fun, sizeof(usb_dev_t));
        if (!info) {
                ddf_fun_destroy(fun);
                return ENOMEM;
        }
        info->address = address;
        info->speed = speed;
        info->fun = fun;
        info->port = port;
        info->tt_address = hub_dev ? hub_dev->tt_address : -1;
        link_initialize(&info->link);
        list_initialize(&info->devices);
        fibril_mutex_initialize(&info->guard);

        if (hub_dev && hub_dev->speed == USB_SPEED_HIGH && usb_speed_is_11(speed))
                info->tt_address = hub_dev->address;

        ddf_fun_set_ops(fun, &usb_ops);
        list_foreach(mids->ids, link, const match_id_t, mid) {
                ddf_fun_add_match_id(fun, mid->id, mid->score);
        }

        errno_t ret = ddf_fun_bind(fun);
        if (ret != EOK) {
                ddf_fun_destroy(fun);
                return ret;
        }

        if (hub_dev) {
                fibril_mutex_lock(&hub_dev->guard);
                list_append(&info->link, &hub_dev->devices);
                fibril_mutex_unlock(&hub_dev->guard);
        } else {
                hc_dev_t *hc_dev = dev_to_hc_dev(parent);
                assert(hc_dev->root_hub == NULL);
                hc_dev->root_hub = info;
        }
        return EOK;
}

#define ADD_MATCHID_OR_RETURN(list, sc, str, ...) \
do { \
        match_id_t *mid = malloc(sizeof(match_id_t)); \
        if (!mid) { \
                clean_match_ids(list); \
                return ENOMEM; \
        } \
        char *id = NULL; \
        int ret = asprintf(&id, str, ##__VA_ARGS__); \
        if (ret < 0) { \
                clean_match_ids(list); \
                free(mid); \
                return ENOMEM; \
        } \
        mid->score = sc; \
        mid->id = id; \
        add_match_id(list, mid); \
} while (0)

/* This is a copy of lib/usbdev/src/recognise.c */
static errno_t create_match_ids(match_id_list_t *l,
    usb_standard_device_descriptor_t *d)
{
        assert(l);
        assert(d);
        
        if (d->vendor_id != 0) {
                /* First, with release number. */
                ADD_MATCHID_OR_RETURN(l, 100,
                    "usb&vendor=%#04x&product=%#04x&release=%x.%x",
                    d->vendor_id, d->product_id, (d->device_version >> 8),
                    (d->device_version & 0xff));
        
                /* Next, without release number. */
                ADD_MATCHID_OR_RETURN(l, 90, "usb&vendor=%#04x&product=%#04x",
                    d->vendor_id, d->product_id);
        }

        /* Class match id */
        ADD_MATCHID_OR_RETURN(l, 50, "usb&class=%s",
            usb_str_class(d->device_class));

        /* As a last resort, try fallback driver. */
        ADD_MATCHID_OR_RETURN(l, 10, "usb&fallback");

        return EOK;

}

static errno_t hcd_ddf_remove_device(ddf_dev_t *device, usb_dev_t *hub,
    unsigned port)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

        hc_dev_t *hc_dev = dev_to_hc_dev(device);
        assert(hc_dev);

        fibril_mutex_lock(&hub->guard);

        usb_dev_t *victim = NULL;

        list_foreach(hub->devices, link, usb_dev_t, it) {
                if (it->port == port) {
                        victim = it;
                        break;
                }
        }
        if (victim) {
                assert(victim->port == port);
                list_remove(&victim->link);
                fibril_mutex_unlock(&hub->guard);
                const errno_t ret = ddf_fun_unbind(victim->fun);
                if (ret == EOK) {
                        usb_address_t address = victim->address;
                        ddf_fun_destroy(victim->fun);
                        hcd_release_address(hcd, address);
                } else {
                        usb_log_warning("Failed to unbind device `%s': %s\n",
                            ddf_fun_get_name(victim->fun), str_error(ret));
                }
                return EOK;
        }
        fibril_mutex_unlock(&hub->guard);
        return ENOENT;
}

static errno_t hcd_ddf_new_device(ddf_dev_t *device, usb_dev_t *hub, unsigned port)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

        usb_speed_t speed = USB_SPEED_MAX;

        /* This checks whether the default address is reserved and gets speed */
        errno_t ret = usb_bus_get_speed(&hcd->bus, USB_ADDRESS_DEFAULT, &speed);
        if (ret != EOK) {
                usb_log_error("Failed to verify speed: %s.", str_error(ret));
                return ret;
        }

        usb_log_debug("Found new %s speed USB device.", usb_str_speed(speed));

        static const usb_target_t default_target = {{
                .address = USB_ADDRESS_DEFAULT,
                .endpoint = 0,
        }};

        usb_address_t address;
        ret = hcd_request_address(hcd, speed, &address);
        if (ret != EOK) {
                usb_log_error("Failed to reserve new address: %s.",
                    str_error(ret));
                return ret;
        }

        usb_log_debug("Reserved new address: %d\n", address);

        const usb_target_t target = {{
                .address = address,
                .endpoint = 0,
        }};

        const usb_address_t tt_address = hub ? hub->tt_address : -1;

        /* Add default pipe on default address */
        usb_log_debug("Device(%d): Adding default target(0:0)\n", address);
        ret = hcd_add_ep(hcd,
            default_target, USB_DIRECTION_BOTH, USB_TRANSFER_CONTROL,
            CTRL_PIPE_MIN_PACKET_SIZE, CTRL_PIPE_MIN_PACKET_SIZE, 1,
            tt_address, port);
        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to add default target: %s.",
                    address, str_error(ret));
                hcd_release_address(hcd, address);
                return ret;
        }

        /* Get max packet size for default pipe */
        usb_standard_device_descriptor_t desc = { 0 };
        const usb_device_request_setup_packet_t get_device_desc_8 =
            GET_DEVICE_DESC(CTRL_PIPE_MIN_PACKET_SIZE);

        // TODO CALLBACKS
        usb_log_debug("Device(%d): Requesting first 8B of device descriptor.",
            address);
        size_t got;
        ret = hcd_send_batch_sync(hcd, default_target, USB_DIRECTION_IN,
            &desc, CTRL_PIPE_MIN_PACKET_SIZE, *(uint64_t *)&get_device_desc_8,
            "read first 8 bytes of dev descriptor", &got);

        if (ret == EOK && got != CTRL_PIPE_MIN_PACKET_SIZE) {
                ret = EOVERFLOW;
        }

        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to get 8B of dev descr: %s.",
                    address, str_error(ret));
                hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return ret;
        }

        /* Register EP on the new address */
        usb_log_debug("Device(%d): Registering control EP.", address);
        ret = hcd_add_ep(hcd, target, USB_DIRECTION_BOTH, USB_TRANSFER_CONTROL,
            ED_MPS_PACKET_SIZE_GET(uint16_usb2host(desc.max_packet_size)),
            ED_MPS_TRANS_OPPORTUNITIES_GET(uint16_usb2host(desc.max_packet_size)),
            ED_MPS_PACKET_SIZE_GET(uint16_usb2host(desc.max_packet_size)),
            tt_address, port);
        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to register EP0: %s",
                    address, str_error(ret));
                hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return ret;
        }

        /* Set new address */
        const usb_device_request_setup_packet_t set_address =
            SET_ADDRESS(target.address);

        usb_log_debug("Device(%d): Setting USB address.", address);
        ret = hcd_send_batch_sync(hcd, default_target, USB_DIRECTION_OUT,
            NULL, 0, *(uint64_t *)&set_address, "set address", &got);

        usb_log_debug("Device(%d): Removing default (0:0) EP.", address);
        hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);

        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to set new address: %s.",
                    address, str_error(ret));
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return ret;
        }

        /* Get std device descriptor */
        const usb_device_request_setup_packet_t get_device_desc =
            GET_DEVICE_DESC(sizeof(desc));

        usb_log_debug("Device(%d): Requesting full device descriptor.",
            address);
        ret = hcd_send_batch_sync(hcd, target, USB_DIRECTION_IN,
            &desc, sizeof(desc), *(uint64_t *)&get_device_desc,
            "read device descriptor", &got);
        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to set get dev descriptor: %s",
                    address, str_error(ret));
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
                return ret;
        }

        /* Create match ids from the device descriptor */
        match_id_list_t mids;
        init_match_ids(&mids);

        usb_log_debug("Device(%d): Creating match IDs.", address);
        ret = create_match_ids(&mids, &desc);
        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to create match ids: %s",
                    address, str_error(ret));
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
                return ret;
        }

        /* Register device */
        usb_log_debug("Device(%d): Registering DDF device.", address);
        ret = hcd_ddf_add_device(device, hub, port, address, speed, NULL, &mids);
        clean_match_ids(&mids);
        if (ret != EOK) {
                usb_log_error("Device(%d): Failed to register: %s.",
                    address, str_error(ret));
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
        }

        return ret;
}

/** Announce root hub to the DDF
 *
 * @param[in] device Host controller ddf device
 * @return Error code
 */
errno_t hcd_ddf_setup_root_hub(ddf_dev_t *device)
{
        assert(device);
        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

        hcd_reserve_default_address(hcd, hcd->bus.max_speed);
        const errno_t ret = hcd_ddf_new_device(device, NULL, 0);
        hcd_release_default_address(hcd);
        return ret;
}

/** Initialize hc structures.
 *
 * @param[in] device DDF instance of the device to use.
 * @param[in] max_speed Maximum supported USB speed.
 * @param[in] bw available bandwidth.
 * @param[in] bw_count Function to compute required ep bandwidth.
 *
 * @return Error code.
 * This function does all the ddf work for hc driver.
 */
errno_t hcd_ddf_setup_hc(ddf_dev_t *device, usb_speed_t max_speed,
    size_t bw, bw_count_func_t bw_count)
{
        assert(device);

        hc_dev_t *instance = ddf_dev_data_alloc(device, sizeof(hc_dev_t));
        if (instance == NULL) {
                usb_log_error("Failed to allocate HCD ddf structure.\n");
                return ENOMEM;
        }
        instance->root_hub = NULL;
        hcd_init(&instance->hcd, max_speed, bw, bw_count);

        errno_t ret = ENOMEM;
        instance->ctl_fun = ddf_fun_create(device, fun_exposed, "ctl");
        if (!instance->ctl_fun) {
                usb_log_error("Failed to create HCD ddf fun.\n");
                goto err_destroy_fun;
        }

        ret = ddf_fun_bind(instance->ctl_fun);
        if (ret != EOK) {
                usb_log_error("Failed to bind ctl_fun: %s.\n", str_error(ret));
                goto err_destroy_fun;
        }

        ret = ddf_fun_add_to_category(instance->ctl_fun, USB_HC_CATEGORY);
        if (ret != EOK) {
                usb_log_error("Failed to add fun to category: %s.\n",
                    str_error(ret));
                ddf_fun_unbind(instance->ctl_fun);
                goto err_destroy_fun;
        }

        /* HC should be ok at this point (except it can't do anything) */
        return EOK;

err_destroy_fun:
        ddf_fun_destroy(instance->ctl_fun);
        instance->ctl_fun = NULL;
        return ret;
}

void hcd_ddf_clean_hc(ddf_dev_t *device)
{
        assert(device);
        hc_dev_t *hc = dev_to_hc_dev(device);
        assert(hc);
        const errno_t ret = ddf_fun_unbind(hc->ctl_fun);
        if (ret == EOK)
                ddf_fun_destroy(hc->ctl_fun);
}

//TODO: Cache parent session in HCD
/** Call the parent driver with a request to enable interrupt
 *
 * @param[in] device Device asking for interrupts
 * @param[in] inum Interrupt number
 * @return Error code.
 */
errno_t hcd_ddf_enable_interrupt(ddf_dev_t *device, int inum)
{
        async_sess_t *parent_sess = ddf_dev_parent_sess_get(device);
        if (parent_sess == NULL)
                return EIO;

        return hw_res_enable_interrupt(parent_sess, inum);
}

//TODO: Cache parent session in HCD
errno_t hcd_ddf_get_registers(ddf_dev_t *device, hw_res_list_parsed_t *hw_res)
{
        async_sess_t *parent_sess = ddf_dev_parent_sess_get(device);
        if (parent_sess == NULL)
                return EIO;

        hw_res_list_parsed_init(hw_res);
        const errno_t ret = hw_res_get_list_parsed(parent_sess, hw_res, 0);
        if (ret != EOK)
                hw_res_list_parsed_clean(hw_res);
        return ret;
}

// TODO: move this someplace else
static inline void irq_code_clean(irq_code_t *code)
{
        if (code) {
                free(code->ranges);
                free(code->cmds);
                code->ranges = NULL;
                code->cmds = NULL;
                code->rangecount = 0;
                code->cmdcount = 0;
        }
}

/** Register interrupt handler
 *
 * @param[in] device Host controller DDF device
 * @param[in] regs Register range
 * @param[in] irq Interrupt number
 * @paran[in] handler Interrupt handler
 * @param[in] gen_irq_code IRQ code generator.
 *
 * @param[out] handle  IRQ capability handle on success.
 *
 * @return Error code.
 */
errno_t hcd_ddf_setup_interrupts(ddf_dev_t *device,
    const hw_res_list_parsed_t *hw_res,
    interrupt_handler_t handler,
    errno_t (*gen_irq_code)(irq_code_t *, const hw_res_list_parsed_t *, int *),
    cap_handle_t *handle)
{

        assert(device);
        if (!handler || !gen_irq_code)
                return ENOTSUP;

        irq_code_t irq_code = {0};

        int irq;
        errno_t ret = gen_irq_code(&irq_code, hw_res, &irq);
        if (ret != EOK) {
                usb_log_error("Failed to generate IRQ code: %s.\n",
                    str_error(ret));
                return ret;
        }

        /* Register handler to avoid interrupt lockup */
        ret = register_interrupt_handler(device, irq, handler,
            &irq_code, handle);
        irq_code_clean(&irq_code);
        if (ret != EOK) {
                usb_log_error("Failed to register interrupt handler: %s.\n",
                    str_error(ret));
                return ret;
        }

        /* Enable interrupts */
        ret = hcd_ddf_enable_interrupt(device, irq);
        if (ret != EOK) {
                usb_log_error("Failed to register interrupt handler: %s.\n",
                    str_error(ret));
                unregister_interrupt_handler(device, *handle);
        }
        return ret;
}

/** IRQ handling callback, forward status from call to diver structure.
 *
 * @param[in] dev DDF instance of the device to use.
 * @param[in] call Pointer to the call from kernel.
 */
void ddf_hcd_gen_irq_handler(ipc_call_t *call, ddf_dev_t *dev)
{
        assert(dev);
        hcd_t *hcd = dev_to_hcd(dev);
        if (!hcd || !hcd->ops.irq_hook) {
                usb_log_error("Interrupt on not yet initialized device.\n");
                return;
        }
        const uint32_t status = IPC_GET_ARG1(*call);
        hcd->ops.irq_hook(hcd, status);
}

static errno_t interrupt_polling(void *arg)
{
        hcd_t *hcd = arg;
        assert(hcd);
        if (!hcd->ops.status_hook || !hcd->ops.irq_hook)
                return ENOTSUP;
        uint32_t status = 0;
        while (hcd->ops.status_hook(hcd, &status) == EOK) {
                hcd->ops.irq_hook(hcd, status);
                status = 0;
                /* We should wait 1 frame - 1ms here, but this polling is a
                 * lame crutch anyway so don't hog the system. 10ms is still
                 * good enough for emergency mode */
                async_usleep(10000);
        }
        return EOK;
}

/** Initialize hc and rh DDF structures and their respective drivers.
 *
 * @param device DDF instance of the device to use
 * @param speed Maximum supported speed
 * @param bw Available bandwidth (arbitrary units)
 * @param bw_count Bandwidth computing function
 * @param irq_handler IRQ handling function
 * @param gen_irq_code Function to generate IRQ pseudocode
 *                     (it needs to return used irq number)
 * @param driver_init Function to initialize HC driver
 * @param driver_fini Function to cleanup HC driver
 * @return Error code
 *
 * This function does all the preparatory work for hc and rh drivers:
 *  - gets device's hw resources
 *  - attempts to enable interrupts
 *  - registers interrupt handler
 *  - calls driver specific initialization
 *  - registers root hub
 */
errno_t hcd_ddf_add_hc(ddf_dev_t *device, const ddf_hc_driver_t *driver)
{
        assert(driver);
        static const struct { size_t bw; bw_count_func_t bw_count; }bw[] = {
            [USB_SPEED_FULL] = { .bw = BANDWIDTH_AVAILABLE_USB11,
                                 .bw_count = bandwidth_count_usb11 },
            [USB_SPEED_HIGH] = { .bw = BANDWIDTH_AVAILABLE_USB11,
                                 .bw_count = bandwidth_count_usb11 },
        };

        errno_t ret = EOK;
        const usb_speed_t speed = driver->hc_speed;
        if (speed >= ARRAY_SIZE(bw) || bw[speed].bw == 0) {
                usb_log_error("Driver `%s' reported unsupported speed: %s",
                    driver->name, usb_str_speed(speed));
                return ENOTSUP;
        }

        hw_res_list_parsed_t hw_res;
        ret = hcd_ddf_get_registers(device, &hw_res);
        if (ret != EOK) {
                usb_log_error("Failed to get register memory addresses "
                    "for `%s': %s.\n", ddf_dev_get_name(device),
                    str_error(ret));
                return ret;
        }

        ret = hcd_ddf_setup_hc(device, speed, bw[speed].bw, bw[speed].bw_count);
        if (ret != EOK) {
                usb_log_error("Failed to setup generic HCD.\n");
                hw_res_list_parsed_clean(&hw_res);
                return ret;
        }

        interrupt_handler_t *irq_handler =
            driver->irq_handler ? driver->irq_handler : ddf_hcd_gen_irq_handler;
        int irq_cap;
        errno_t irq_ret = hcd_ddf_setup_interrupts(device, &hw_res,
            irq_handler, driver->irq_code_gen, &irq_cap);
        bool irqs_enabled = (irq_ret == EOK);
        if (irqs_enabled) {
                usb_log_debug("Hw interrupts enabled.\n");
        }

        if (driver->claim) {
                ret = driver->claim(device);
                if (ret != EOK) {
                        usb_log_error("Failed to claim `%s' for driver `%s'",
                            ddf_dev_get_name(device), driver->name);
                        return ret;
                }
        }


        /* Init hw driver */
        hcd_t *hcd = dev_to_hcd(device);
        ret = driver->init(hcd, &hw_res, irqs_enabled);
        hw_res_list_parsed_clean(&hw_res);
        if (ret != EOK) {
                usb_log_error("Failed to init HCD: %s.\n", str_error(ret));
                goto irq_unregister;
        }

        /* Need working irq replacement to setup root hub */
        if (!irqs_enabled && hcd->ops.status_hook) {
                hcd->polling_fibril = fibril_create(interrupt_polling, hcd);
                if (hcd->polling_fibril == 0) {
                        usb_log_error("Failed to create polling fibril\n");
                        ret = ENOMEM;
                        goto irq_unregister;
                }
                fibril_add_ready(hcd->polling_fibril);
                usb_log_warning("Failed to enable interrupts: %s."
                    " Falling back to polling.\n", str_error(irq_ret));
        }

        /*
         * Creating root hub registers a new USB device so HC
         * needs to be ready at this time.
         */
        ret = hcd_ddf_setup_root_hub(device);
        if (ret != EOK) {
                usb_log_error("Failed to setup HC root hub: %s.\n",
                    str_error(ret));
                driver->fini(dev_to_hcd(device));
irq_unregister:
                /* Unregistering non-existent should be ok */
                unregister_interrupt_handler(device, irq_cap);
                hcd_ddf_clean_hc(device);
                return ret;
        }

        usb_log_info("Controlling new `%s' device `%s'.\n",
            driver->name, ddf_dev_get_name(device));
        return EOK;
}
/**
 * @}
 */