source: mainline/uspace/lib/usbhost/src/usb2_bus.c@ 4ef3627f

/*
 * Copyright (c) 2011 Jan Vesely
 * Copyright (c) 2017 Ondrej Hlavaty <aearsis@eideo.cz>
 * 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
 * HC Endpoint management.
 */

#include <assert.h>
#include <errno.h>
#include <macros.h>
#include <stdbool.h>
#include <stdlib.h>
#include <str_error.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/request.h>
#include <usb/usb.h>

#include "endpoint.h"
#include "ddf_helpers.h"

#include "usb2_bus.h"

/** Ops receive generic bus_t pointer. */
static inline usb2_bus_t *bus_to_usb2_bus(bus_t *bus_base)
{
        assert(bus_base);
        return (usb2_bus_t *) bus_base;
}

/** Get list that holds endpoints for given address.
 * @param bus usb2_bus structure, non-null.
 * @param addr USB address, must be >= 0.
 * @return Pointer to the appropriate list.
 */
static list_t * get_list(usb2_bus_t *bus, usb_address_t addr)
{
        assert(bus);
        assert(addr >= 0);
        return &bus->devices[addr % ARRAY_SIZE(bus->devices)].endpoint_list;
}

/** Get speed assigned to USB address.
 *
 * @param[in] bus Device manager structure to use.
 * @param[in] address Address the caller wants to find.
 * @param[out] speed Assigned speed.
 * @return Error code.
 */
static int usb2_bus_get_speed(bus_t *bus_base, usb_address_t address, usb_speed_t *speed)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);

        if (!usb_address_is_valid(address)) {
                return EINVAL;
        }

        const int ret = bus->devices[address].occupied ? EOK : ENOENT;
        if (speed && bus->devices[address].occupied) {
                *speed = bus->devices[address].speed;
        }

        return ret;
}

static const usb_endpoint_desc_t usb2_default_control_ep = {
        .endpoint_no = 0,
        .transfer_type = USB_TRANSFER_CONTROL,
        .direction = USB_DIRECTION_BOTH,
        .max_packet_size = CTRL_PIPE_MIN_PACKET_SIZE,
        .packets = 1,
};


static const usb_target_t usb2_default_target = {{
        .address = USB_ADDRESS_DEFAULT,
        .endpoint = 0,
}};

static int usb2_bus_address_device(bus_t *bus, hcd_t *hcd, device_t *dev)
{
        int err;

        /* The default address is currently reserved for this device */
        dev->address = USB_ADDRESS_DEFAULT;

        /** Reserve address early, we want pretty log messages */
        usb_address_t address;
        if ((err = bus_request_address(bus, &address, false, dev->speed))) {
                usb_log_error("Failed to reserve new address: %s.",
                    str_error(err));
                return err;
        }
        usb_log_debug("Device(%d): Reserved new address.", address);

        /* Add default pipe on default address */
        usb_log_debug("Device(%d): Adding default target (0:0)", address);

        endpoint_t *default_ep;
        err = bus_add_endpoint(bus, dev, &usb2_default_control_ep, &default_ep);
        if (err != EOK) {
                usb_log_error("Device(%d): Failed to add default target: %s.",
                    address, str_error(err));
                goto err_address;
        }

        uint16_t max_packet_size;
        if ((err = hcd_get_ep0_max_packet_size(&max_packet_size, hcd, dev)))
                goto err_address;

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

        usb_log_debug("Device(%d): Setting USB address.", address);
        err = hcd_send_batch_sync(hcd, dev, usb2_default_target, USB_DIRECTION_OUT,
            NULL, 0, *(uint64_t *)&set_address, "set address");
        if (err != 0) {
                usb_log_error("Device(%d): Failed to set new address: %s.",
                    address, str_error(err));
                goto err_default_control_ep;
        }

        /* We need to remove ep before we change the address */
        if ((err = bus_remove_endpoint(bus, default_ep))) {
                usb_log_error("Device(%d): Failed to unregister default target: %s", address, str_error(err));
                goto err_address;
        }
        endpoint_del_ref(default_ep);

        dev->address = address;

        const usb_endpoint_desc_t control_ep = {
                .endpoint_no = 0,
                .transfer_type = USB_TRANSFER_CONTROL,
                .direction = USB_DIRECTION_BOTH,
                .max_packet_size = max_packet_size,
                .packets = 1,
        };

        /* Register EP on the new address */
        usb_log_debug("Device(%d): Registering control EP.", address);
        err = bus_add_endpoint(bus, dev, &control_ep, NULL);
        if (err != EOK) {
                usb_log_error("Device(%d): Failed to register EP0: %s",
                    address, str_error(err));
                goto err_address;
        }

        return EOK;

err_default_control_ep:
        bus_remove_endpoint(bus, default_ep);
        endpoint_del_ref(default_ep);
err_address:
        bus_release_address(bus, address);
        return err;
}

/** Enumerate a new USB device
 */
static int usb2_bus_enumerate_device(bus_t *bus, hcd_t *hcd, device_t *dev)
{
        int err;

        /* The speed of the new device was reported by the hub when reserving
         * default address.
         */
        if ((err = usb2_bus_get_speed(bus, USB_ADDRESS_DEFAULT, &dev->speed))) {
                usb_log_error("Failed to verify speed: %s.", str_error(err));
                return err;
        }
        usb_log_debug("Found new %s speed USB device.", usb_str_speed(dev->speed));

        if (!dev->hub) {
                /* The device is the roothub */
                dev->tt = (usb_tt_address_t) {
                        .address = -1,
                        .port = 0,
                };
        } else {
                hcd_setup_device_tt(dev);
        }

        /* Assign an address to the device */
        if ((err = usb2_bus_address_device(bus, hcd, dev))) {
                usb_log_error("Failed to setup address of the new device: %s", str_error(err));
                return err;
        }

        /* Read the device descriptor, derive the match ids */
        if ((err = hcd_ddf_device_explore(hcd, dev))) {
                usb_log_error("Device(%d): Failed to explore device: %s", dev->address, str_error(err));
                bus_release_address(bus, dev->address);
                return err;
        }

        return EOK;
}

/** Get a free USB address
 *
 * @param[in] bus Device manager structure to use.
 * @return Free address, or error code.
 */
static int usb_bus_get_free_address(usb2_bus_t *bus, usb_address_t *addr)
{
        usb_address_t new_address = bus->last_address;
        do {
                new_address = (new_address + 1) % USB_ADDRESS_COUNT;
                if (new_address == USB_ADDRESS_DEFAULT)
                        new_address = 1;
                if (new_address == bus->last_address)
                        return ENOSPC;
        } while (bus->devices[new_address].occupied);

        assert(new_address != USB_ADDRESS_DEFAULT);
        bus->last_address = new_address;

        *addr = new_address;
        return EOK;
}

/** Find endpoint.
 * @param bus usb_bus structure, non-null.
 * @param target Endpoint address.
 * @param direction Communication direction.
 * @return Pointer to endpoint_t structure representing given communication
 * target, NULL if there is no such endpoint registered.
 * @note Assumes that the internal mutex is locked.
 */
static endpoint_t *usb2_bus_find_ep(bus_t *bus_base, device_t *device, usb_target_t target, usb_direction_t direction)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);

        assert(device->address == target.address);

        list_foreach(*get_list(bus, target.address), link, endpoint_t, ep) {
                if (((direction == ep->direction)
                       || (ep->direction == USB_DIRECTION_BOTH)
                       || (direction == USB_DIRECTION_BOTH))
                    && (target.endpoint == ep->endpoint))
                        return ep;
        }
        return NULL;
}

static endpoint_t *usb2_bus_create_ep(bus_t *bus)
{
        endpoint_t *ep = malloc(sizeof(endpoint_t));
        if (!ep)
                return NULL;

        endpoint_init(ep, bus);
        return ep;
}

static usb_target_t usb2_ep_to_target(endpoint_t *ep)
{
        assert(ep);
        assert(ep->device);

        return (usb_target_t) {{
                .address = ep->device->address,
                .endpoint = ep->endpoint,
        }};
}

/** Register an endpoint to the bus. Reserves bandwidth.
 * @param bus usb_bus structure, non-null.
 * @param endpoint USB endpoint number.
 */
static int usb2_bus_register_ep(bus_t *bus_base, device_t *device, endpoint_t *ep, const usb_endpoint_desc_t *desc)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);
        assert(ep);

        ep->device = device;

        /* Extract USB2-related information from endpoint_desc */
        ep->endpoint = desc->endpoint_no;
        ep->direction = desc->direction;
        ep->transfer_type = desc->transfer_type;
        ep->max_packet_size = desc->max_packet_size;
        ep->packets = desc->packets;

        ep->bandwidth = bus_base->ops.count_bw(ep, desc->max_packet_size);

        /* Check for existence */
        if (usb2_bus_find_ep(bus_base, ep->device, usb2_ep_to_target(ep), ep->direction))
                return EEXIST;

        /* Check for available bandwidth */
        if (ep->bandwidth > bus->free_bw)
                return ENOSPC;

        list_append(&ep->link, get_list(bus, ep->device->address));
        bus->free_bw -= ep->bandwidth;

        return EOK;
}


/** Release bandwidth reserved by the given endpoint.
 */
static int usb2_bus_unregister_ep(bus_t *bus_base, endpoint_t *ep)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);
        assert(ep);

        list_remove(&ep->link);
        ep->device = NULL;

        bus->free_bw += ep->bandwidth;

        return EOK;
}

static int usb2_bus_reset_toggle(bus_t *bus_base, usb_target_t target, toggle_reset_mode_t mode)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);

        if (!usb_target_is_valid(target))
                return EINVAL;

        if (mode == RESET_NONE)
                return EOK;

        int ret = ENOENT;

        list_foreach(*get_list(bus, target.address), link, endpoint_t, ep) {
                assert(ep->device->address == target.address);

                if (mode == RESET_ALL || ep->endpoint == target.endpoint) {
                        endpoint_toggle_set(ep, 0);
                        ret = EOK;
                }
        }
        return ret;
}

/** Unregister and destroy all endpoints using given address.
 * @param bus usb_bus structure, non-null.
 * @param address USB address.
 * @param endpoint USB endpoint number.
 * @param direction Communication direction.
 * @return Error code.
 */
static int usb2_bus_release_address(bus_t *bus_base, usb_address_t address)
{
        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);

        if (!usb_address_is_valid(address))
                return EINVAL;

        const int ret = bus->devices[address].occupied ? EOK : ENOENT;
        bus->devices[address].occupied = false;

        list_t *list = get_list(bus, address);
        for (link_t *link = list_first(list); link != NULL; ) {
                endpoint_t *ep = list_get_instance(link, endpoint_t, link);
                link = list_next(link, list);

                assert(ep->device->address == address);
                list_remove(&ep->link);

                usb_log_warning("Endpoint %d:%d %s was left behind, removing.\n",
                    address, ep->endpoint, usb_str_direction(ep->direction));

                /* Drop bus reference */
                endpoint_del_ref(ep);
        }

        return ret;
}

/** Request USB address.
 * @param bus usb_device_manager
 * @param addr Pointer to requested address value, place to store new address
 * @parma strict Fail if the requested address is not available.
 * @return Error code.
 * @note Default address is only available in strict mode.
 */
static int usb2_bus_request_address(bus_t *bus_base, usb_address_t *addr, bool strict, usb_speed_t speed)
{
        int err;

        usb2_bus_t *bus = bus_to_usb2_bus(bus_base);
        assert(addr);

        if (!usb_address_is_valid(*addr))
                return EINVAL;

        /* Only grant default address to strict requests */
        if ((*addr == USB_ADDRESS_DEFAULT) && !strict) {
                if ((err = usb_bus_get_free_address(bus, addr)))
                        return err;
        }
        else if (bus->devices[*addr].occupied) {
                if (strict) {
                        return ENOENT;
                }
                if ((err = usb_bus_get_free_address(bus, addr)))
                        return err;
        }

        assert(usb_address_is_valid(*addr));
        assert(bus->devices[*addr].occupied == false);
        assert(*addr != USB_ADDRESS_DEFAULT || strict);

        bus->devices[*addr].occupied = true;
        bus->devices[*addr].speed = speed;

        return EOK;
}

static const bus_ops_t usb2_bus_ops = {
        .enumerate_device = usb2_bus_enumerate_device,
        .create_endpoint = usb2_bus_create_ep,
        .find_endpoint = usb2_bus_find_ep,
        .unregister_endpoint = usb2_bus_unregister_ep,
        .register_endpoint = usb2_bus_register_ep,
        .request_address = usb2_bus_request_address,
        .release_address = usb2_bus_release_address,
        .reset_toggle = usb2_bus_reset_toggle,
};

/** Initialize to default state.
 *
 * @param bus usb_bus structure, non-null.
 * @param available_bandwidth Size of the bandwidth pool.
 * @param bw_count function to use to calculate endpoint bw requirements.
 * @return Error code.
 */
int usb2_bus_init(usb2_bus_t *bus, size_t available_bandwidth, count_bw_func_t count_bw)
{
        assert(bus);

        bus_init(&bus->base, sizeof(device_t));

        bus->base.ops = usb2_bus_ops;
        bus->base.ops.count_bw = count_bw;

        bus->free_bw = available_bandwidth;
        bus->last_address = 0;
        for (unsigned i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
                list_initialize(&bus->devices[i].endpoint_list);
                bus->devices[i].speed = USB_SPEED_MAX;
                bus->devices[i].occupied = false;
        }
        return EOK;
}
/**
 * @}
 */