HelenOS sources

root/uspace/lib/usbhost/src/ddf_helpers.c

DEFINITIONS

1. register_endpoint
2. unregister_endpoint
3. default_address_reservation
4. device_enumerate
5. device_remove
6. get_device_description
7. transfer
8. create_match_ids
9. hcd_ddf_fun_create
10. hcd_ddf_fun_destroy
11. hcd_ddf_setup_match_ids
12. hcd_ddf_setup_hc
13. hcd_ddf_clean_hc
14. hcd_ddf_enable_interrupt
15. hcd_ddf_get_registers

/*
 * Copyright (c) 2013 Jan Vesely
 * Copyright (c) 2018 Ondrej Hlavaty, Michal Staruch, Petr Manek
 * 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
 * Helpers to work with the DDF interface.
 */

#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 <str_error.h>
#include <usb/classes/classes.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/usb.h>
#include <usb/dma_buffer.h>
#include <usb_iface.h>
#include <usbhc_iface.h>

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

#include "ddf_helpers.h"

/**
 * DDF usbhc_iface callback. Passes the endpoint descriptors, fills the pipe
 * descriptor according to the contents of the endpoint.
 *
 * @param[in] fun DDF function of the device in question.
 * @param[out] pipe_desc The pipe descriptor to be filled.
 * @param[in] endpoint_desc Endpoint descriptors from the device.
 * @return Error code.
 */
static errno_t register_endpoint(ddf_fun_t *fun, usb_pipe_desc_t *pipe_desc,
    const usb_endpoint_descriptors_t *ep_desc)
{
        assert(fun);
        hc_device_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);

        endpoint_t *ep;
        const int err = bus_endpoint_add(dev, ep_desc, &ep);
        if (err)
                return err;

        if (pipe_desc) {
                pipe_desc->endpoint_no = ep->endpoint;
                pipe_desc->direction = ep->direction;
                pipe_desc->transfer_type = ep->transfer_type;
                pipe_desc->max_transfer_size = ep->max_transfer_size;
                pipe_desc->transfer_buffer_policy = ep->transfer_buffer_policy;
        }
        endpoint_del_ref(ep);

        return EOK;
}

/**
 * DDF usbhc_iface callback. Unregister endpoint that makes the other end of
 * the pipe described.
 *
 * @param fun DDF function of the device in question.
 * @param pipe_desc Pipe description.
 * @return Error code.
 */
static errno_t unregister_endpoint(ddf_fun_t *fun, const usb_pipe_desc_t *pipe_desc)
{
        assert(fun);
        hc_device_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);

        endpoint_t *ep = bus_find_endpoint(dev, pipe_desc->endpoint_no, pipe_desc->direction);
        if (!ep)
                return ENOENT;

        const errno_t err = bus_endpoint_remove(ep);

        endpoint_del_ref(ep);
        return err;
}

/**
 * DDF usbhc_iface callback. Calls the respective bus operation directly.
 *
 * @param fun DDF function of the device (hub) requesting the address.
 */
static errno_t default_address_reservation(ddf_fun_t *fun, bool reserve)
{
        assert(fun);
        hc_device_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 %s default address", dev->address, reserve ? "requested" : "releasing");
        if (reserve) {
                return bus_reserve_default_address(hcd->bus, dev);
        } else {
                bus_release_default_address(hcd->bus, dev);
                return EOK;
        }
}

/**
 * DDF usbhc_iface callback. Calls the bus operation directly.
 *
 * @param fun DDF function of the device (hub) requesting the address.
 * @param speed USB speed of the new device
 */
static errno_t device_enumerate(ddf_fun_t *fun, unsigned port, usb_speed_t speed)
{
        assert(fun);
        ddf_dev_t *hc = ddf_fun_get_dev(fun);
        assert(hc);
        hc_device_t *hcd = dev_to_hcd(hc);
        assert(hcd);
        device_t *hub = ddf_fun_data_get(fun);
        assert(hub);

        errno_t err;

        if (!usb_speed_is_valid(speed))
                return EINVAL;

        usb_log_debug("Hub %d reported a new %s speed device on port: %u",
            hub->address, usb_str_speed(speed), port);

        device_t *dev = hcd_ddf_fun_create(hcd, speed);
        if (!dev) {
                usb_log_error("Failed to create USB device function.");
                return ENOMEM;
        }

        dev->hub = hub;
        dev->tier = hub->tier + 1;
        dev->port = port;
        dev->speed = speed;

        if ((err = bus_device_enumerate(dev))) {
                usb_log_error("Failed to initialize USB dev memory structures.");
                goto err_usb_dev;
        }

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

        return EOK;

err_usb_dev:
        hcd_ddf_fun_destroy(dev);
        return err;
}

static errno_t device_remove(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        device_t *hub = ddf_fun_data_get(fun);
        assert(hub);
        usb_log_debug("Hub `%s' reported removal of device on port %u",
            ddf_fun_get_name(fun), port);

        device_t *victim = NULL;

        fibril_mutex_lock(&hub->guard);
        list_foreach(hub->devices, link, device_t, it) {
                if (it->port == port) {
                        victim = it;
                        break;
                }
        }
        fibril_mutex_unlock(&hub->guard);

        if (!victim) {
                usb_log_warning("Hub '%s' tried to remove non-existent"
                    " device.", ddf_fun_get_name(fun));
                return ENOENT;
        }

        assert(victim->fun);
        assert(victim->port == port);
        assert(victim->hub == hub);

        bus_device_gone(victim);
        return EOK;
}

/**
 * Gets description of the device that is calling.
 *
 * @param[in] fun Device function.
 * @param[out] desc Device descriptor to be filled.
 * @return Error code.
 */
static errno_t get_device_description(ddf_fun_t *fun, usb_device_desc_t *desc)
{
        assert(fun);
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);

        if (!desc)
                return EOK;

        *desc = (usb_device_desc_t) {
                .address = dev->address,
                .depth = dev->tier,
                .speed = dev->speed,
                .handle = ddf_fun_get_handle(fun),
                .iface = -1,
        };
        return EOK;
}

/**
 * Transfer issuing interface function.
 *
 * @param fun DDF function.
 * @param target Communication target.
 * @param dir Communication direction.
 * @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 transfer(ddf_fun_t *fun,
    const usbhc_iface_transfer_request_t *ifreq,
    usbhc_iface_transfer_callback_t callback, void *arg)
{
        assert(fun);
        device_t *dev = ddf_fun_data_get(fun);
        assert(dev);

        const usb_target_t target = {
                {
                        .address = dev->address,
                        .endpoint = ifreq->endpoint,
                        .stream = ifreq->stream,
                }
        };

        if (!usb_target_is_valid(&target))
                return EINVAL;

        if (ifreq->offset > 0 && ifreq->size == 0)
                return EINVAL;

        if (ifreq->size > 0 && !dma_buffer_is_set(&ifreq->buffer))
                return EBADMEM;

        if (!callback && arg)
                return EBADMEM;

        const transfer_request_t request = {
                .target = target,
                .dir = ifreq->dir,
                .buffer = ifreq->buffer,
                .offset = ifreq->offset,
                .size = ifreq->size,
                .setup = ifreq->setup,
                .on_complete = callback,
                .arg = arg,
                .name = (ifreq->dir == USB_DIRECTION_IN) ? "READ" : "WRITE",
        };

        return bus_issue_transfer(dev, &request);
}

/** USB device interface */
static usb_iface_t usb_iface = {
        .get_my_description = get_device_description,
};

/** USB host controller interface */
static usbhc_iface_t usbhc_iface = {
        .default_address_reservation = default_address_reservation,

        .device_enumerate = device_enumerate,
        .device_remove = device_remove,

        .register_endpoint = register_endpoint,
        .unregister_endpoint = unregister_endpoint,

        .transfer = transfer,
};

/** Standard USB device interface) */
static ddf_dev_ops_t usb_ops = {
        .interfaces[USB_DEV_IFACE] = &usb_iface,
        .interfaces[USBHC_DEV_IFACE] = &usbhc_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 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=%#06x&product=%#06x&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=%#06x&product=%#06x",
                    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;
}

device_t *hcd_ddf_fun_create(hc_device_t *hc, usb_speed_t speed)
{
        /* Create DDF function for the new device */
        ddf_fun_t *fun = ddf_fun_create(hc->ddf_dev, 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, hc->bus->device_size);
        if (!dev) {
                ddf_fun_destroy(fun);
                return NULL;
        }

        bus_device_init(dev, hc->bus);
        dev->fun = fun;
        dev->speed = speed;
        return dev;
}

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

errno_t hcd_ddf_setup_match_ids(device_t *device, usb_standard_device_descriptor_t *desc)
{
        errno_t err;
        match_id_list_t mids;

        init_match_ids(&mids);

        /* Create match ids from the device descriptor */
        usb_log_debug("Device(%d): Creating match IDs.", device->address);
        if ((err = create_match_ids(&mids, desc))) {
                return err;
        }

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

        return EOK;
}

/** 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, size_t size)
{
        assert(device);

        hc_device_t *instance = ddf_dev_data_alloc(device, size);
        if (instance == NULL) {
                usb_log_error("Failed to allocate HCD ddf structure.");
                return ENOMEM;
        }
        instance->ddf_dev = device;

        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.");
                goto err_destroy_fun;
        }

        ret = ddf_fun_bind(instance->ctl_fun);
        if (ret != EOK) {
                usb_log_error("Failed to bind ctl_fun: %s.", 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.",
                    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(hc_device_t *hcd)
{
        if (ddf_fun_unbind(hcd->ctl_fun) == EOK)
                ddf_fun_destroy(hcd->ctl_fun);
}

/** 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(hc_device_t *hcd, int inum)
{
        async_sess_t *parent_sess = ddf_dev_parent_sess_get(hcd->ddf_dev);
        if (parent_sess == NULL)
                return EIO;

        return hw_res_enable_interrupt(parent_sess, inum);
}

errno_t hcd_ddf_get_registers(hc_device_t *hcd, hw_res_list_parsed_t *hw_res)
{
        async_sess_t *parent_sess = ddf_dev_parent_sess_get(hcd->ddf_dev);
        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;
}

/**
 * @}
 */