source: mainline/uspace/lib/usbhost/src/ddf_helpers.c@ d37514e

/*
 * 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/host/bus.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 <stdlib.h>
#include <str_error.h>
#include <usb_iface.h>

#include "ddf_helpers.h"

typedef struct hc_dev {
        ddf_fun_t *ctl_fun;
        hcd_t hcd;
} 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 int hcd_ddf_new_device(hcd_t *hcd, ddf_dev_t *hc, device_t *hub_dev, unsigned port);
static int hcd_ddf_remove_device(ddf_dev_t *device, device_t *hub, unsigned port);


/* DDF INTERFACE */

/** Register endpoint interface function.
 * @param fun DDF function.
 * @param endpoint_desc Endpoint description.
 * @return Error code.
 */
static int register_endpoint(
        ddf_fun_t *fun, usb_endpoint_desc_t *endpoint_desc)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(hcd->bus);
        assert(dev);

        usb_log_debug("Register endpoint %d:%d %s-%s %zuB %ums.\n",
                dev->address, endpoint_desc->endpoint_no,
                usb_str_transfer_type(endpoint_desc->transfer_type),
                usb_str_direction(endpoint_desc->direction),
                endpoint_desc->max_packet_size, endpoint_desc->usb2.polling_interval);

        return bus_add_endpoint(hcd->bus, dev, endpoint_desc, NULL);
}

 /** Unregister endpoint interface function.
  * @param fun DDF function.
  * @param endpoint_desc Endpoint description.
  * @return Error code.
  */
static int unregister_endpoint(
        ddf_fun_t *fun, usb_endpoint_desc_t *endpoint_desc)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(hcd->bus);
        assert(dev);

        const usb_target_t target = {{
                .address = dev->address,
                .endpoint = endpoint_desc->endpoint_no
        }};

        usb_log_debug("Unregister endpoint %d:%d %s.\n",
                dev->address, endpoint_desc->endpoint_no,
                usb_str_direction(endpoint_desc->direction));

        endpoint_t *ep = bus_find_endpoint(hcd->bus, dev, target, endpoint_desc->direction);
        if (!ep)
                return ENOENT;

        return bus_remove_endpoint(hcd->bus, ep);
}

static int reserve_default_address(ddf_fun_t *fun, usb_speed_t speed)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(hcd->bus);
        assert(dev);

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

static int release_default_address(ddf_fun_t *fun)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(hcd->bus);
        assert(dev);

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

static int device_enumerate(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *hc = ddf_fun_get_dev(fun);
        assert(hc);
        hcd_t *hcd = dev_to_hcd(hc);
        assert(hcd);
        device_t *hub = ddf_fun_data_get(fun);
        assert(hub);

        usb_log_debug("Hub %d reported a new USB device on port: %u\n",
            hub->address, port);
        return hcd_ddf_new_device(hcd, hc, hub, port);
}

static int device_remove(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *ddf_dev = ddf_fun_get_dev(fun);
        device_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 int 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 int dev_read(ddf_fun_t *fun, usb_target_t target,
    uint64_t setup_data, char *data, size_t size,
    usb_iface_transfer_callback_t callback, void *arg)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);

        target.address = dev->address;

        return hcd_send_batch(hcd, dev, target, USB_DIRECTION_IN,
            data, size, setup_data,
            callback, 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 int dev_write(ddf_fun_t *fun, usb_target_t target,
    uint64_t setup_data, const char *data, size_t size,
    usb_iface_transfer_callback_t callback, void *arg)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);

        target.address = dev->address;

        return hcd_send_batch(hcd, dev, target, USB_DIRECTION_OUT,
            (char *) data, size, setup_data,
            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 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 int 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 int hcd_ddf_remove_device(ddf_dev_t *device, device_t *hub,
    unsigned port)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);
        assert(hcd->bus);

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

        fibril_mutex_lock(&hub->guard);

        device_t *victim = NULL;

        list_foreach(hub->devices, link, device_t, it) {
                if (it->port == port) {
                        victim = it;
                        break;
                }
        }
        if (victim) {
                assert(victim->fun);
                assert(victim->port == port);
                assert(victim->hub == hub);
                list_remove(&victim->link);
                fibril_mutex_unlock(&hub->guard);
                const int ret = ddf_fun_unbind(victim->fun);
                if (ret == EOK) {
                        usb_address_t address = victim->address;
                        bus_remove_device(hcd->bus, hcd, victim);
                        ddf_fun_destroy(victim->fun);
                        bus_release_address(hcd->bus, 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;
}

device_t *hcd_ddf_device_create(ddf_dev_t *hc, size_t device_size)
{
        /* Create DDF function for the new device */
        ddf_fun_t *fun = ddf_fun_create(hc, fun_inner, NULL);
        if (!fun)
                return NULL;

        ddf_fun_set_ops(fun, &usb_ops);

        /* Create USB device node for the new device */
        device_t *dev = ddf_fun_data_alloc(fun, device_size);
        if (!dev) {
                ddf_fun_destroy(fun);
                return NULL;
        }

        device_init(dev);
        dev->fun = fun;
        return dev;
}

void hcd_ddf_device_destroy(device_t *dev)
{
        assert(dev);
        assert(dev->fun);
        ddf_fun_destroy(dev->fun);
}

int hcd_ddf_device_explore(hcd_t *hcd, device_t *device)
{
        int err;
        match_id_list_t mids;
        usb_standard_device_descriptor_t desc = { 0 };

        init_match_ids(&mids);

        const usb_target_t control_ep = {{
                .address = device->address,
                .endpoint = 0,
        }};

        /* 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.",
            device->address);
        ssize_t got = hcd_send_batch_sync(hcd, device, control_ep, USB_DIRECTION_IN,
            (char *) &desc, sizeof(desc), *(uint64_t *)&get_device_desc,
            "read device descriptor");
        if (got < 0) {
                err = got < 0 ? got : EOVERFLOW;
                usb_log_error("Device(%d): Failed to set get dev descriptor: %s",
                    device->address, str_error(err));
                goto out;
        }

        /* Create match ids from the device descriptor */
        usb_log_debug("Device(%d): Creating match IDs.", device->address);
        if ((err = create_match_ids(&mids, &desc))) {
                usb_log_error("Device(%d): Failed to create match ids: %s", device->address, str_error(err));
                goto out;
        }

        list_foreach(mids.ids, link, const match_id_t, mid) {
                ddf_fun_add_match_id(device->fun, mid->id, mid->score);
        }

out:
        clean_match_ids(&mids);
        return err;
}

int hcd_ddf_device_online(ddf_fun_t *fun)
{
        assert(fun);

        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);
        assert(hcd->bus);

        usb_log_info("Device(%d): Requested to be brought online.", dev->address);

        return bus_online_device(hcd->bus, hcd, dev);
}

int hcd_ddf_device_offline(ddf_fun_t *fun)
{
        assert(fun);

        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);
        assert(hcd->bus);

        usb_log_info("Device(%d): Requested to be taken offline.", dev->address);

        return bus_offline_device(hcd->bus, hcd, dev);
}

static int hcd_ddf_new_device(hcd_t *hcd, ddf_dev_t *hc, device_t *hub, unsigned port)
{
        int err;
        assert(hcd);
        assert(hcd->bus);
        assert(hub);
        assert(hc);

        device_t *dev = hcd_ddf_device_create(hc, hcd->bus->device_size);
        if (!dev) {
                usb_log_error("Failed to create USB device function.");
                return ENOMEM;
        }

        dev->hub = hub;
        dev->port = port;

        if ((err = bus_enumerate_device(hcd->bus, hcd, dev))) {
                usb_log_error("Failed to initialize USB dev memory structures.");
                return err;
        }

        /* If the driver didn't name the dev when enumerating,
         * do it in some generic way.
         */
        if (!ddf_fun_get_name(dev->fun)) {
                device_set_default_name(dev);
        }

        if ((err = ddf_fun_bind(dev->fun))) {
                usb_log_error("Device(%d): Failed to register: %s.", dev->address, str_error(err));
                goto err_usb_dev;
        }

        fibril_mutex_lock(&hub->guard);
        list_append(&dev->link, &hub->devices);
        fibril_mutex_unlock(&hub->guard);

        return EOK;

err_usb_dev:
        hcd_ddf_device_destroy(dev);
        return err;
}

/** Announce root hub to the DDF
 *
 * @param[in] device Host controller ddf device
 * @return Error code
 */
int hcd_setup_virtual_root_hub(hcd_t *hcd, ddf_dev_t *hc)
{
        int err;

        assert(hc);
        assert(hcd);
        assert(hcd->bus);

        if ((err = bus_reserve_default_address(hcd->bus, USB_SPEED_MAX))) {
                usb_log_error("Failed to reserve default address for roothub setup: %s", str_error(err));
                return err;
        }

        device_t *dev = hcd_ddf_device_create(hc, hcd->bus->device_size);
        if (!dev) {
                usb_log_error("Failed to create function for the root hub.");
                goto err_default_address;
        }

        ddf_fun_set_name(dev->fun, "roothub");

        /* Assign an address to the device */
        if ((err = bus_enumerate_device(hcd->bus, hcd, dev))) {
                usb_log_error("Failed to enumerate roothub device: %s", str_error(err));
                goto err_usb_dev;
        }

        if ((err = ddf_fun_bind(dev->fun))) {
                usb_log_error("Failed to register roothub: %s.", str_error(err));
                goto err_usb_dev;
        }

        bus_release_default_address(hcd->bus);
        return EOK;

err_usb_dev:
        hcd_ddf_device_destroy(dev);
err_default_address:
        bus_release_default_address(hcd->bus);
        return err;
}

/** 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.
 */
int hcd_ddf_setup_hc(ddf_dev_t *device)
{
        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;
        }
        hcd_init(&instance->hcd);

        int 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 int 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.
 */
int 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
int 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 int 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.
 *
 * @return IRQ capability handle on success.
 * @return Negative error code.
 */
int hcd_ddf_setup_interrupts(ddf_dev_t *device,
    const hw_res_list_parsed_t *hw_res,
    interrupt_handler_t handler,
    irq_code_gen_t gen_irq_code)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);

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

        irq_code_t irq_code = {0};

        const int irq = gen_irq_code(&irq_code, hcd, hw_res);
        if (irq < 0) {
                usb_log_error("Failed to generate IRQ code: %s.\n",
                    str_error(irq));
                return irq;
        }

        /* Register handler to avoid interrupt lockup */
        const int irq_cap = register_interrupt_handler(device, irq, handler,
            &irq_code);
        irq_code_clean(&irq_code);
        if (irq_cap < 0) {
                usb_log_error("Failed to register interrupt handler: %s.\n",
                    str_error(irq_cap));
                return irq_cap;
        }

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

/** IRQ handling callback, forward status from call to diver structure.
 *
 * @param[in] dev DDF instance of the device to use.
 * @param[in] iid (Unused).
 * @param[in] call Pointer to the call from kernel.
 */
void ddf_hcd_gen_irq_handler(ipc_callid_t iid, 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 int 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
 */
int hcd_ddf_add_hc(ddf_dev_t *device, const ddf_hc_driver_t *driver)
{
        assert(driver);

        int ret = EOK;

        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);
        if (ret != EOK) {
                usb_log_error("Failed to setup generic HCD.\n");
                goto err_hw_res;
        }

        hcd_t *hcd = dev_to_hcd(device);

        if (driver->init)
                ret = driver->init(hcd, &hw_res, device);
        if (ret != EOK) {
                usb_log_error("Failed to init HCD.\n");
                goto err_hcd;
        }

        /* Setup interrupts  */
        interrupt_handler_t *irq_handler =
            driver->irq_handler ? driver->irq_handler : ddf_hcd_gen_irq_handler;
        const int irq_cap = hcd_ddf_setup_interrupts(device, &hw_res,
            irq_handler, driver->irq_code_gen);
        bool irqs_enabled = !(irq_cap < 0);
        if (irqs_enabled) {
                usb_log_debug("Hw interrupts enabled.\n");
        }

        /* Claim the device from BIOS */
        if (driver->claim)
                ret = driver->claim(hcd, device);
        if (ret != EOK) {
                usb_log_error("Failed to claim `%s' for driver `%s': %s",
                    ddf_dev_get_name(device), driver->name, str_error(ret));
                goto err_irq;
        }

        /* Start hw driver */
        if (driver->start)
                ret = driver->start(hcd, irqs_enabled);
        if (ret != EOK) {
                usb_log_error("Failed to start HCD: %s.\n", str_error(ret));
                goto err_irq;
        }

        /* 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 err_started;
                }
                fibril_add_ready(hcd->polling_fibril);
                usb_log_warning("Failed to enable interrupts: %s."
                    " Falling back to polling.\n", str_error(irq_cap));
        }

        /*
         * Creating root hub registers a new USB device so HC
         * needs to be ready at this time.
         */
        if (driver->setup_root_hub)
                ret = driver->setup_root_hub(hcd, device);
        if (ret != EOK) {
                usb_log_error("Failed to setup HC root hub: %s.\n",
                    str_error(ret));
                goto err_polling;
        }

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

err_polling:
        // TODO: Stop the polling fibril (refactor the interrupt_polling func)
        //
err_started:
        if (driver->stop)
                driver->stop(hcd);
err_irq:
        unregister_interrupt_handler(device, irq_cap);
        if (driver->fini)
                driver->fini(hcd);
err_hcd:
        hcd_ddf_clean_hc(device);
err_hw_res:
        hw_res_list_parsed_clean(&hw_res);
        return ret;
}

/**
 * @}
 */