source: mainline/uspace/lib/usbhost/src/bus.c@ bad4a05

/*
 * 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
 *
 * The Bus is a structure that serves as an interface of the HC driver
 * implementation for the usbhost library. Every HC driver that uses libusbhost
 * must use a bus_t (or its child), fill it with bus_ops and present it to the
 * library. The library then handles the DDF interface and translates it to the
 * bus callbacks.
 */

#include <ddf/driver.h>
#include <errno.h>
#include <mem.h>
#include <stdio.h>
#include <usb/debug.h>

#include "endpoint.h"
#include "bus.h"

/**
 * Initializes the base bus structure.
 */
void bus_init(bus_t *bus, size_t device_size)
{
        assert(bus);
        assert(device_size >= sizeof(device_t));
        memset(bus, 0, sizeof(bus_t));

        fibril_mutex_initialize(&bus->guard);
        bus->device_size = device_size;
        bus->default_address_speed = USB_SPEED_MAX;
}

/**
 * Initialize the device_t structure belonging to a bus.
 */
int bus_device_init(device_t *dev, bus_t *bus)
{
        assert(bus);

        memset(dev, 0, sizeof(*dev));

        dev->bus = bus;

        link_initialize(&dev->link);
        list_initialize(&dev->devices);
        fibril_mutex_initialize(&dev->guard);

        return EOK;
}

/**
 * Create a name of the ddf function node.
 */
int bus_device_set_default_name(device_t *dev)
{
        assert(dev);
        assert(dev->fun);

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

        return ddf_fun_set_name(dev->fun, buf);
}

/**
 * Invoke the device_enumerate bus operation.
 */
int bus_device_enumerate(device_t *dev)
{
        assert(dev);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(dev->bus->ops, device_enumerate);
        if (!ops)
                return ENOTSUP;

        return ops->device_enumerate(dev);
}

/**
 * Invoke the device_remove bus operation.
 */
void bus_device_remove(device_t *dev)
{
        assert(dev);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(dev->bus->ops, device_remove);
        assert(ops);

        return ops->device_remove(dev);
}

/**
 * Invoke the device_online bus operation.
 */
int bus_device_online(device_t *dev)
{
        assert(dev);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(dev->bus->ops, device_online);
        if (!ops)
                return ENOTSUP;

        return ops->device_online(dev);
}

/**
 * Invoke the device_offline bus operation.
 */
int bus_device_offline(device_t *dev)
{
        assert(dev);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(dev->bus->ops, device_offline);
        if (!ops)
                return ENOTSUP;

        return ops->device_offline(dev);
}

/**
 * Create and register new endpoint to the bus.
 *
 * @param[in] device The device of which the endpoint shall be created
 * @param[in] desc Endpoint descriptors as reported by the device
 * @param[out] out_ep The resulting new endpoint reference, if any. Can be NULL.
 */
int bus_endpoint_add(device_t *device, const usb_endpoint_descriptors_t *desc, endpoint_t **out_ep)
{
        int err;
        assert(device);

        bus_t *bus = device->bus;

        const bus_ops_t *register_ops = BUS_OPS_LOOKUP(bus->ops, endpoint_register);
        if (!register_ops)
                return ENOTSUP;

        const bus_ops_t *create_ops = BUS_OPS_LOOKUP(bus->ops, endpoint_create);
        endpoint_t *ep;
        if (create_ops) {
                ep = create_ops->endpoint_create(device, desc);
                if (!ep)
                        return ENOMEM;
        } else {
                ep = calloc(1, sizeof(endpoint_t));
                if (!ep)
                        return ENOMEM;
                endpoint_init(ep, device, desc);
        }

        /* Bus reference */
        endpoint_add_ref(ep);

        if (ep->max_transfer_size == 0) {
                usb_log_warning("Invalid endpoint description (mps %zu, "
                        "%u packets)", ep->max_packet_size, ep->packets_per_uframe);
                /* Bus reference */
                endpoint_del_ref(ep);
                return EINVAL;
        }

        usb_log_debug("Register endpoint %d:%d %s-%s %zuB.\n",
            device->address, ep->endpoint,
            usb_str_transfer_type(ep->transfer_type),
            usb_str_direction(ep->direction),
            ep->max_transfer_size);

        fibril_mutex_lock(&device->guard);
        if (!device->online && ep->endpoint != 0) {
                err = EAGAIN;
        } else if (device->endpoints[ep->endpoint] != NULL) {
                err = EEXIST;
        } else {
                err = register_ops->endpoint_register(ep);
                if (!err)
                        device->endpoints[ep->endpoint] = ep;
        }
        fibril_mutex_unlock(&device->guard);
        if (err) {
                endpoint_del_ref(ep);
                return err;
        }

        if (out_ep) {
                /* Exporting reference */
                endpoint_add_ref(ep);
                *out_ep = ep;
        }

        return EOK;
}

/**
 * Search for an endpoint. Returns a reference.
 */
endpoint_t *bus_find_endpoint(device_t *device, usb_endpoint_t endpoint)
{
        assert(device);

        fibril_mutex_lock(&device->guard);
        endpoint_t *ep = device->endpoints[endpoint];
        if (ep) {
                /* Exporting reference */
                endpoint_add_ref(ep);
        }
        fibril_mutex_unlock(&device->guard);
        return ep;
}

/**
 * Remove an endpoint from the device. Consumes a reference.
 */
int bus_endpoint_remove(endpoint_t *ep)
{
        assert(ep);
        assert(ep->device);

        device_t *device = ep->device;
        if (!device)
                return ENOENT;

        bus_t *bus = device->bus;

        const bus_ops_t *ops = BUS_OPS_LOOKUP(bus->ops, endpoint_unregister);
        if (!ops)
                return ENOTSUP;

        usb_log_debug("Unregister endpoint %d:%d %s-%s %zuB.\n",
            device->address, ep->endpoint,
            usb_str_transfer_type(ep->transfer_type),
            usb_str_direction(ep->direction),
            ep->max_transfer_size);

        fibril_mutex_lock(&device->guard);
        ops->endpoint_unregister(ep);
        device->endpoints[ep->endpoint] = NULL;
        fibril_mutex_unlock(&device->guard);

        /* Abort a transfer batch, if there was any */
        endpoint_abort(ep);

        /* Bus reference */
        endpoint_del_ref(ep);

        /* Given reference */
        endpoint_del_ref(ep);

        return EOK;
}

/**
 * Reserve the default address on the bus. Also, report the speed of the device
 * that is listening on the default address.
 *
 * The speed is then used for devices enumerated while the address is reserved.
 */
int bus_reserve_default_address(bus_t *bus, usb_speed_t speed)
{
        assert(bus);

        fibril_mutex_lock(&bus->guard);
        if (bus->default_address_speed != USB_SPEED_MAX) {
                fibril_mutex_unlock(&bus->guard);
                return EAGAIN;
        } else {
                bus->default_address_speed = speed;
                fibril_mutex_unlock(&bus->guard);
                return EOK;
        }
}

/**
 * Release the default address.
 */
void bus_release_default_address(bus_t *bus)
{
        assert(bus);
        bus->default_address_speed = USB_SPEED_MAX;
}

/**
 * Initiate a transfer on the bus. Finds the target endpoint, creates
 * a transfer batch and schedules it.
 *
 * @param device Device for which to send the batch
 * @param target The target of the transfer.
 * @param direction A direction of the transfer.
 * @param data A pointer to the data buffer.
 * @param size Size of the data buffer.
 * @param setup_data Data to use in the setup stage (Control communication type)
 * @param on_complete Callback which is called after the batch is complete
 * @param arg Callback parameter.
 * @param name Communication identifier (for nicer output).
 * @return Error code.
 */
int bus_device_send_batch(device_t *device, usb_target_t target,
    usb_direction_t direction, char *data, size_t size, uint64_t setup_data,
    usbhc_iface_transfer_callback_t on_complete, void *arg, const char *name)
{
        assert(device->address == target.address);

        /* Temporary reference */
        endpoint_t *ep = bus_find_endpoint(device, target.endpoint);
        if (ep == NULL) {
                usb_log_error("Endpoint(%d:%d) not registered for %s.\n",
                    device->address, target.endpoint, name);
                return ENOENT;
        }

        assert(ep->device == device);

        const int err = endpoint_send_batch(ep, target, direction, data, size, setup_data,
            on_complete, arg, name);

        /* Temporary reference */
        endpoint_del_ref(ep);

        return err;
}

typedef struct {
        fibril_mutex_t done_mtx;
        fibril_condvar_t done_cv;
        unsigned done;

        size_t transfered_size;
        int error;
} sync_data_t;

/**
 * Callback for finishing the transfer. Wake the issuing thread.
 */
static int sync_transfer_complete(void *arg, int error, size_t transfered_size)
{
        sync_data_t *d = arg;
        assert(d);
        d->transfered_size = transfered_size;
        d->error = error;
        fibril_mutex_lock(&d->done_mtx);
        d->done = 1;
        fibril_condvar_broadcast(&d->done_cv);
        fibril_mutex_unlock(&d->done_mtx);
        return EOK;
}

/**
 * Issue a transfer on the bus, wait for result.
 *
 * @param device Device for which to send the batch
 * @param target The target of the transfer.
 * @param direction A direction of the transfer.
 * @param data A pointer to the data buffer.
 * @param size Size of the data buffer.
 * @param setup_data Data to use in the setup stage (Control communication type)
 * @param name Communication identifier (for nicer output).
 */
ssize_t bus_device_send_batch_sync(device_t *device, usb_target_t target,
    usb_direction_t direction, char *data, size_t size, uint64_t setup_data,
    const char *name)
{
        sync_data_t sd = { .done = 0 };
        fibril_mutex_initialize(&sd.done_mtx);
        fibril_condvar_initialize(&sd.done_cv);

        const int ret = bus_device_send_batch(device, target, direction,
            data, size, setup_data,
            sync_transfer_complete, &sd, name);
        if (ret != EOK)
                return ret;

        fibril_mutex_lock(&sd.done_mtx);
        while (!sd.done) {
                fibril_condvar_wait(&sd.done_cv, &sd.done_mtx);
        }
        fibril_mutex_unlock(&sd.done_mtx);

        return (sd.error == EOK)
                ? (ssize_t) sd.transfered_size
                : (ssize_t) sd.error;
}

/**
 * @}
 */