source: mainline/uspace/lib/usbhost/src/ddf_helpers.c@ ce33c10

/*
 * 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_iface.h>
#include <usb/classes/classes.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/request.h>
#include <errno.h>
#include <str_error.h>

#include "ddf_helpers.h"

#define CTRL_PIPE_MIN_PACKET_SIZE 8

typedef struct usb_dev {
        link_t link;
        list_t devices;
        fibril_mutex_t guard;
        ddf_fun_t *fun;
        usb_address_t address;
        usb_speed_t speed;
        usb_address_t tt_address;
        unsigned port;
} usb_dev_t;

typedef struct hc_dev {
        ddf_fun_t *ctl_fun;
        hcd_t hcd;
        usb_dev_t *root_hub;
} 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(ddf_dev_t *device, usb_dev_t *hub, unsigned port);
static int hcd_ddf_remove_device(ddf_dev_t *device, usb_dev_t *hub, unsigned port);


/* DDF INTERFACE */

/** Register endpoint interface function.
 * @param fun DDF function.
 * @param address USB address of the device.
 * @param endpoint USB endpoint number to be registered.
 * @param transfer_type Endpoint's transfer type.
 * @param direction USB communication direction the endpoint is capable of.
 * @param max_packet_size Maximu size of packets the endpoint accepts.
 * @param interval Preferred timeout between communication.
 * @return Error code.
 */
static int register_endpoint(
    ddf_fun_t *fun, usb_endpoint_t endpoint,
    usb_transfer_type_t transfer_type, usb_direction_t direction,
    size_t max_packet_size, unsigned interval)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);
        const size_t size = max_packet_size;
        const usb_target_t target =
            {{.address = dev->address, .endpoint = endpoint}};

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

        return hcd_add_ep(hcd, target, direction, transfer_type,
            max_packet_size, size, dev->tt_address, dev->port);
}

/** Unregister endpoint interface function.
 * @param fun DDF function.
 * @param address USB address of the endpoint.
 * @param endpoint USB endpoint number.
 * @param direction Communication direction of the enpdoint to unregister.
 * @return Error code.
 */
static int unregister_endpoint(
    ddf_fun_t *fun, usb_endpoint_t endpoint, usb_direction_t direction)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);
        const usb_target_t target =
            {{.address = dev->address, .endpoint = endpoint}};
        usb_log_debug("Unregister endpoint %d:%d %s.\n",
            dev->address, endpoint, usb_str_direction(direction));
        return hcd_remove_ep(hcd, target, direction);
}

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));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);

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

static int release_default_address(ddf_fun_t *fun)
{
        assert(fun);
        hcd_t *hcd = dev_to_hcd(ddf_fun_get_dev(fun));
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(hcd);
        assert(dev);

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

static int device_enumerate(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *ddf_dev = ddf_fun_get_dev(fun);
        usb_dev_t *dev = ddf_fun_data_get(fun);
        assert(ddf_dev);
        assert(dev);
        usb_log_debug("Hub %d reported a new USB device on port: %u\n",
            dev->address, port);
        return hcd_ddf_new_device(ddf_dev, dev, port);
}

static int device_remove(ddf_fun_t *fun, unsigned port)
{
        assert(fun);
        ddf_dev_t *ddf_dev = ddf_fun_get_dev(fun);
        usb_dev_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_endpoint_t endpoint,
    uint64_t setup_data, uint8_t *data, size_t size,
    usbhc_iface_transfer_in_callback_t callback, void *arg)
{
        assert(fun);
        usb_dev_t *usb_dev = ddf_fun_data_get(fun);
        assert(usb_dev);
        const usb_target_t target = {{
            .address =  usb_dev->address,
            .endpoint = endpoint,
        }};
        return hcd_send_batch(dev_to_hcd(ddf_fun_get_dev(fun)), target,
            USB_DIRECTION_IN, data, size, setup_data, callback, NULL, 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_endpoint_t endpoint,
    uint64_t setup_data, const uint8_t *data, size_t size,
    usbhc_iface_transfer_out_callback_t callback, void *arg)
{
        assert(fun);
        usb_dev_t *usb_dev = ddf_fun_data_get(fun);
        assert(usb_dev);
        const usb_target_t target = {{
            .address =  usb_dev->address,
            .endpoint = endpoint,
        }};
        return hcd_send_batch(dev_to_hcd(ddf_fun_get_dev(fun)),
            target, USB_DIRECTION_OUT, (uint8_t*)data, size, setup_data, NULL,
            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 GET_DEVICE_DESC(size) \
{ \
        .request_type = SETUP_REQUEST_TYPE_DEVICE_TO_HOST \
            | (USB_REQUEST_TYPE_STANDARD << 5) \
            | USB_REQUEST_RECIPIENT_DEVICE, \
        .request = USB_DEVREQ_GET_DESCRIPTOR, \
        .value = uint16_host2usb(USB_DESCTYPE_DEVICE << 8), \
        .index = uint16_host2usb(0), \
        .length = uint16_host2usb(size), \
};

#define SET_ADDRESS(address) \
{ \
        .request_type = SETUP_REQUEST_TYPE_HOST_TO_DEVICE \
            | (USB_REQUEST_TYPE_STANDARD << 5) \
            | USB_REQUEST_RECIPIENT_DEVICE, \
        .request = USB_DEVREQ_SET_ADDRESS, \
        .value = uint16_host2usb(address), \
        .index = uint16_host2usb(0), \
        .length = uint16_host2usb(0), \
};

static int hcd_ddf_add_device(ddf_dev_t *parent, usb_dev_t *hub_dev,
    unsigned port, usb_address_t address, usb_speed_t speed, const char *name,
    const match_id_list_t *mids)
{
        assert(parent);

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

        ddf_fun_t *fun = ddf_fun_create(parent, fun_inner, name);
        if (!fun)
                return ENOMEM;
        usb_dev_t *info = ddf_fun_data_alloc(fun, sizeof(usb_dev_t));
        if (!info) {
                ddf_fun_destroy(fun);
                return ENOMEM;
        }
        info->address = address;
        info->speed = speed;
        info->fun = fun;
        info->port = port;
        info->tt_address = hub_dev ? hub_dev->tt_address : -1;
        link_initialize(&info->link);
        list_initialize(&info->devices);
        fibril_mutex_initialize(&info->guard);

        if (hub_dev && hub_dev->speed == USB_SPEED_HIGH && usb_speed_is_11(speed))
                info->tt_address = hub_dev->address;

        ddf_fun_set_ops(fun, &usb_ops);
        list_foreach(mids->ids, link, const match_id_t, mid) {
                ddf_fun_add_match_id(fun, mid->id, mid->score);
        }

        int ret = ddf_fun_bind(fun);
        if (ret != EOK) {
                ddf_fun_destroy(fun);
                return ret;
        }

        if (hub_dev) {
                fibril_mutex_lock(&hub_dev->guard);
                list_append(&info->link, &hub_dev->devices);
                fibril_mutex_unlock(&hub_dev->guard);
        } else {
                hc_dev_t *hc_dev = dev_to_hc_dev(parent);
                assert(hc_dev->root_hub == NULL);
                hc_dev->root_hub = info;
        }
        return EOK;
}

#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, usb_dev_t *hub,
    unsigned port)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

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

        fibril_mutex_lock(&hub->guard);

        usb_dev_t *victim = NULL;

        list_foreach(hub->devices, link, usb_dev_t, it) {
                if (it->port == port) {
                        victim = it;
                        break;
                }
        }
        if (victim && victim->port == port) {
                list_remove(&victim->link);
                fibril_mutex_unlock(&hub->guard);
                const int ret = ddf_fun_unbind(victim->fun);
                if (ret == EOK) {
                        ddf_fun_destroy(victim->fun);
                        hcd_release_address(hcd, victim->address);
                } else {
                        usb_log_warning("Failed to unbind device `%s': %s\n",
                            ddf_fun_get_name(victim->fun), str_error(ret));
                }
                return EOK;
        }
        return ENOENT;
}

static int hcd_ddf_new_device(ddf_dev_t *device, usb_dev_t *hub, unsigned port)
{
        assert(device);

        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

        usb_speed_t speed = USB_SPEED_MAX;

        /* This checks whether the default address is reserved and gets speed */
        int ret = usb_bus_get_speed(&hcd->bus, USB_ADDRESS_DEFAULT, &speed);
        if (ret != EOK) {
                return ret;
        }

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

        const usb_address_t address = hcd_request_address(hcd, speed);
        if (address < 0)
                return address;

        const usb_target_t target = {{
                .address = address,
                .endpoint = 0,
        }};

        const usb_address_t tt_address = hub ? hub->tt_address : -1;

        /* Add default pipe on default address */
        ret = hcd_add_ep(hcd,
            default_target, USB_DIRECTION_BOTH, USB_TRANSFER_CONTROL,
            CTRL_PIPE_MIN_PACKET_SIZE, CTRL_PIPE_MIN_PACKET_SIZE,
            tt_address, port);

        if (ret != EOK) {
                hcd_release_address(hcd, address);
                return ret;
        }

        /* Get max packet size for default pipe */
        usb_standard_device_descriptor_t desc = { 0 };
        static const usb_device_request_setup_packet_t get_device_desc_8 =
            GET_DEVICE_DESC(CTRL_PIPE_MIN_PACKET_SIZE);

        // TODO CALLBACKS
        ssize_t got = hcd_send_batch_sync(hcd, default_target, USB_DIRECTION_IN,
            &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) {
                hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return got < 0 ? got : EOVERFLOW;
        }

        /* Register EP on the new address */
        ret = hcd_add_ep(hcd, target, USB_DIRECTION_BOTH, USB_TRANSFER_CONTROL,
            desc.max_packet_size, desc.max_packet_size, tt_address, port);
        if (ret != EOK) {
                hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return ret;
        }

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

        got = hcd_send_batch_sync(hcd, default_target, USB_DIRECTION_OUT,
            NULL, 0, *(uint64_t *)&set_address, "set address");

        hcd_remove_ep(hcd, default_target, USB_DIRECTION_BOTH);

        if (got != 0) {
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, address);
                return got;
        }
        
        /* Get std device descriptor */
        static const usb_device_request_setup_packet_t get_device_desc =
            GET_DEVICE_DESC(sizeof(desc));

        got = hcd_send_batch_sync(hcd, target, USB_DIRECTION_IN,
            &desc, sizeof(desc), *(uint64_t *)&get_device_desc,
            "read device descriptor");
        if (ret != EOK) {
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
                return got < 0 ? got : EOVERFLOW;
        }

        /* Create match ids from the device descriptor */
        match_id_list_t mids;
        init_match_ids(&mids);

        ret = create_match_ids(&mids, &desc);
        if (ret != EOK) {
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
                return ret;
        }

        /* Register device */
        ret = hcd_ddf_add_device(device, hub, port, address, speed, NULL, &mids);
        clean_match_ids(&mids);
        if (ret != EOK) {
                hcd_remove_ep(hcd, target, USB_DIRECTION_BOTH);
                hcd_release_address(hcd, target.address);
        }

        return ret;
}

/** Announce root hub to the DDF
 *
 * @param[in] device Host controller ddf device
 * @return Error code
 */
int hcd_ddf_setup_root_hub(ddf_dev_t *device)
{
        assert(device);
        hcd_t *hcd = dev_to_hcd(device);
        assert(hcd);

        hcd_reserve_default_address(hcd, hcd->bus.max_speed);
        const int ret = hcd_ddf_new_device(device, NULL, 0);
        hcd_release_default_address(hcd);
        return ret;
}

/** 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, usb_speed_t max_speed,
    size_t bw, bw_count_func_t bw_count)
{
        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;
        }
        instance->root_hub = NULL;
        hcd_init(&instance->hcd, max_speed, bw, bw_count);

        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);
}
/**
 * @}
 */