source: mainline/uspace/lib/usbhost/src/hcd.c@ b60eac1

/*
 * 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 libusbhost
 * @{
 */
/** @file
 *
 */

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

#include <assert.h>
#include <async.h>
#include <errno.h>
#include <macros.h>
#include <usb_iface.h>
#include <str_error.h>

#include "hcd.h"


/** Initialize hcd_t structure.
 * Initializes device and endpoint managers. Sets data and hook pointer to NULL.
 *
 * @param hcd hcd_t structure to initialize, non-null.
 * @param max_speed Maximum supported USB speed (full, high).
 * @param bandwidth Available bandwidth, passed to endpoint manager.
 * @param bw_count Bandwidth compute function, passed to endpoint manager.
 */
void hcd_init(hcd_t *hcd) {
        assert(hcd);

        hcd_set_implementation(hcd, NULL, NULL, NULL);
}

/** Get max packet size for the control endpoint 0.
 *
 * For LS, HS, and SS devices this value is fixed. For FS devices we must fetch
 * the first 8B of the device descriptor to determine it.
 *
 * @return Max packet size for EP 0
 */
int hcd_get_ep0_max_packet_size(uint16_t *mps, hcd_t *hcd, device_t *dev)
{
        assert(mps);

        static const uint16_t mps_fixed [] = {
                [USB_SPEED_LOW] = 8,
                [USB_SPEED_HIGH] = 64,
                [USB_SPEED_SUPER] = 512,
        };

        if (dev->speed < ARRAY_SIZE(mps_fixed) && mps_fixed[dev->speed] != 0) {
                *mps = mps_fixed[dev->speed];
                return EOK;
        }

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

        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);

        usb_log_debug("Requesting first 8B of device descriptor to determine MPS.");
        ssize_t got = hcd_send_batch_sync(hcd, dev, control_ep, USB_DIRECTION_IN,
            (char *) &desc, CTRL_PIPE_MIN_PACKET_SIZE, *(uint64_t *)&get_device_desc_8,
            "read first 8 bytes of dev descriptor");

        if (got != CTRL_PIPE_MIN_PACKET_SIZE) {
                const int err = got < 0 ? got : EOVERFLOW;
                usb_log_error("Failed to get 8B of dev descr: %s.", str_error(err));
                return err;
        }

        if (desc.descriptor_type != USB_DESCTYPE_DEVICE) {
                usb_log_error("The device responded with wrong device descriptor.");
                return EIO;
        }

        uint16_t version = uint16_usb2host(desc.usb_spec_version);
        if (version < 0x0300) {
                /* USB 2 and below have MPS raw in the field */
                *mps = desc.max_packet_size;
        } else {
                /* USB 3 have MPS as an 2-based exponent */
                *mps = (1 << desc.max_packet_size);
        }
        return EOK;
}

/**
 * Setup devices Transaction Translation.
 *
 * This applies for Low/Full speed devices under High speed hub only. Other
 * devices just inherit TT from the hub.
 *
 * Roothub must be handled specially.
 */
void hcd_setup_device_tt(device_t *dev)
{
        if (!dev->hub)
                return;

        if (dev->hub->speed == USB_SPEED_HIGH && usb_speed_is_11(dev->speed)) {
                /* For LS devices under HS hub */
                dev->tt.address = dev->hub->address;
                dev->tt.port = dev->port;
        }
        else {
                /* Inherit hub's TT */
                dev->tt = dev->hub->tt;
        }
}

/** Prepare generic usb_transfer_batch and schedule it.
 * @param hcd Host controller driver.
 * @param target address and endpoint number.
 * @param setup_data Data to use in setup stage (Control communication type)
 * @param in Callback for device to host communication.
 * @param out Callback for host to device communication.
 * @param arg Callback parameter.
 * @param name Communication identifier (for nicer output).
 * @return Error code.
 */
int hcd_send_batch(hcd_t *hcd, 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(hcd);
        assert(device->address == target.address);

        if (!hcd->ops.schedule) {
                usb_log_error("HCD does not implement scheduler.\n");
                return ENOTSUP;
        }

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

        // TODO cut here aka provide helper to call with instance of endpoint_t in hand

        usb_log_debug2("%s %d:%d %zu(%zu).\n",
            name, target.address, target.endpoint, size, ep->max_packet_size);

        const size_t bw = bus_count_bw(ep, size);
        /* Check if we have enough bandwidth reserved */
        if (ep->bandwidth < bw) {
                usb_log_error("Endpoint(%d:%d) %s needs %zu bw "
                    "but only %zu is reserved.\n",
                    device->address, ep->endpoint, name, bw, ep->bandwidth);
                return ENOSPC;
        }

        usb_transfer_batch_t *batch = usb_transfer_batch_create(ep);
        if (!batch) {
                usb_log_error("Failed to create transfer batch.\n");
                return ENOMEM;
        }

        batch->target = target;
        batch->buffer = data;
        batch->buffer_size = size;
        batch->setup.packed = setup_data;
        batch->dir = direction;
        batch->on_complete = on_complete;
        batch->on_complete_data = arg;

        /* Check for commands that reset toggle bit */
        if (ep->transfer_type == USB_TRANSFER_CONTROL)
                batch->toggle_reset_mode
                        = usb_request_get_toggle_reset_mode(&batch->setup.packet);

        const int ret = hcd->ops.schedule(hcd, batch);
        if (ret != EOK) {
                usb_log_warning("Batch %p failed to schedule: %s", batch, str_error(ret));
                usb_transfer_batch_destroy(batch);
        }

        /* Drop our own reference to ep. */
        endpoint_del_ref(ep);

        return ret;
}

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

        size_t transfered_size;
        int error;
} sync_data_t;

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;
}

ssize_t hcd_send_batch_sync(hcd_t *hcd, device_t *device, usb_target_t target,
    usb_direction_t direction, char *data, size_t size, uint64_t setup_data,
    const char *name)
{
        assert(hcd);
        sync_data_t sd = { .done = 0 };
        fibril_mutex_initialize(&sd.done_mtx);
        fibril_condvar_initialize(&sd.done_cv);

        const int ret = hcd_send_batch(hcd, 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;
}


/**
 * @}
 */