source: mainline/uspace/lib/usb/src/hubdrv.c@ dac43be

/*
 * Copyright (c) 2010 Matus Dekanek
 * 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 libusb usb
 * @{
 */
/** @file
 * @brief Hub driver.
 */
#include <usb/hcdhubd.h>
#include <usb/devreq.h>
#include <usbhc_iface.h>
#include <usb/descriptor.h>
#include <driver.h>
#include <bool.h>
#include <errno.h>
#include <usb/classes/hub.h>
#include "hcdhubd_private.h"

static void check_hub_changes(void);

size_t USB_HUB_MAX_DESCRIPTOR_SIZE = 71;

//*********************************************
//
//  various utils
//
//*********************************************

void * usb_serialize_hub_descriptor(usb_hub_descriptor_t * descriptor) {
        //base size
        size_t size = 7;
        //variable size according to port count
        size_t var_size = descriptor->ports_count / 8 + ((descriptor->ports_count % 8 > 0) ? 1 : 0);
        size += 2 * var_size;
        uint8_t * result = (uint8_t*) malloc(size);
        //size
        result[0] = size;
        //descriptor type
        result[1] = USB_DESCTYPE_HUB;
        result[2] = descriptor->ports_count;
        /// @fixme handling of endianness??
        result[3] = descriptor->hub_characteristics / 256;
        result[4] = descriptor->hub_characteristics % 256;
        result[5] = descriptor->pwr_on_2_good_time;
        result[6] = descriptor->current_requirement;

        size_t i;
        for (i = 0; i < var_size; ++i) {
                result[7 + i] = descriptor->devices_removable[i];
        }
        for (i = 0; i < var_size; ++i) {
                result[7 + var_size + i] = 255;
        }
        return result;
}

usb_hub_descriptor_t * usb_deserialize_hub_desriptor(void * serialized_descriptor) {
        uint8_t * sdescriptor = (uint8_t*) serialized_descriptor;
        if (sdescriptor[1] != USB_DESCTYPE_HUB) return NULL;
        usb_hub_descriptor_t * result = (usb_hub_descriptor_t*) malloc(sizeof (usb_hub_descriptor_t));
        //uint8_t size = sdescriptor[0];
        result->ports_count = sdescriptor[2];
        /// @fixme handling of endianness??
        result->hub_characteristics = sdescriptor[4] + 256 * sdescriptor[3];
        result->pwr_on_2_good_time = sdescriptor[5];
        result->current_requirement = sdescriptor[6];
        size_t var_size = result->ports_count / 8 + ((result->ports_count % 8 > 0) ? 1 : 0);
        result->devices_removable = (uint8_t*) malloc(var_size);

        size_t i;
        for (i = 0; i < var_size; ++i) {
                result->devices_removable[i] = sdescriptor[7 + i];
        }
        return result;
}


//*********************************************
//
//  hub driver code
//
//*********************************************

static void set_hub_address(usb_hc_device_t *hc, usb_address_t address);

usb_hcd_hub_info_t * usb_create_hub_info(device_t * device) {
        usb_hcd_hub_info_t* result = (usb_hcd_hub_info_t*) malloc(sizeof (usb_hcd_hub_info_t));
        //get parent device
        /// @TODO this code is not correct
        device_t * my_hcd = device;
        while (my_hcd->parent)
                my_hcd = my_hcd->parent;
        //dev->
        printf("%s: owner hcd found: %s\n", hc_driver->name, my_hcd->name);
        //we add the hub into the first hc
        //link_t *link_hc = hc_list.next;
        //usb_hc_device_t *hc = list_get_instance(link_hc,
        //              usb_hc_device_t, link);
        //must get generic device info


        return result;
}

/** Callback when new hub device is detected.
 *
 * @param dev New device.
 * @return Error code.
 */
int usb_add_hub_device(device_t *dev) {
        usb_hc_device_t *hc = list_get_instance(hc_list.next, usb_hc_device_t, link);
        set_hub_address(hc, 5);

        check_hub_changes();

        /*
         * We are some (probably deeply nested) hub.
         * Thus, assign our own operations and explore already
         * connected devices.
         */
        //insert hub into list
        //find owner hcd
        device_t * my_hcd = dev;
        while (my_hcd->parent)
                my_hcd = my_hcd->parent;
        //dev->
        printf("%s: owner hcd found: %s\n", hc_driver->name, my_hcd->name);
        my_hcd = dev;
        while (my_hcd->parent)
                my_hcd = my_hcd->parent;
        //dev->

        printf("%s: owner hcd found: %s\n", hc_driver->name, my_hcd->name);

        //create the hub structure
        usb_hcd_hub_info_t * hub_info = usb_create_hub_info(dev);


        //append into the list
        //we add the hub into the first hc
        list_append(&hub_info->link, &hc->hubs);



        return EOK;
        //return ENOTSUP;
}

/** Sample usage of usb_hc_async functions.
 * This function sets hub address using standard SET_ADDRESS request.
 *
 * @warning This function shall be removed once you are familiar with
 * the usb_hc_ API.
 *
 * @param hc Host controller the hub belongs to.
 * @param address New hub address.
 */
static void set_hub_address(usb_hc_device_t *hc, usb_address_t address) {
        printf("%s: setting hub address to %d\n", hc->generic->name, address);
        usb_target_t target = {0, 0};
        usb_handle_t handle;
        int rc;

        usb_device_request_setup_packet_t setup_packet = {
                .request_type = 0,
                .request = USB_DEVREQ_SET_ADDRESS,
                .index = 0,
                .length = 0,
        };
        setup_packet.value = address;

        rc = usb_hc_async_control_write_setup(hc, target,
                        &setup_packet, sizeof (setup_packet), &handle);
        if (rc != EOK) {
                return;
        }

        rc = usb_hc_async_wait_for(handle);
        if (rc != EOK) {
                return;
        }

        rc = usb_hc_async_control_write_status(hc, target, &handle);
        if (rc != EOK) {
                return;
        }

        rc = usb_hc_async_wait_for(handle);
        if (rc != EOK) {
                return;
        }

        printf("%s: hub address changed\n", hc->generic->name);
}

/** Check changes on all known hubs.
 */
static void check_hub_changes(void) {
        /*
         * Iterate through all HCs.
         */
        link_t *link_hc;
        for (link_hc = hc_list.next;
                        link_hc != &hc_list;
                        link_hc = link_hc->next) {
                usb_hc_device_t *hc = list_get_instance(link_hc,
                                usb_hc_device_t, link);
                /*
                 * Iterate through all their hubs.
                 */
                link_t *link_hub;
                for (link_hub = hc->hubs.next;
                                link_hub != &hc->hubs;
                                link_hub = link_hub->next) {
                        usb_hcd_hub_info_t *hub = list_get_instance(link_hub,
                                        usb_hcd_hub_info_t, link);

                        /*
                         * Check status change pipe of this hub.
                         */
                        usb_target_t target = {
                                .address = hub->device->address,
                                .endpoint = 1
                        };

                        // FIXME: count properly
                        size_t byte_length = (hub->port_count / 8) + 1;

                        void *change_bitmap = malloc(byte_length);
                        size_t actual_size;
                        usb_handle_t handle;

                        /*
                         * Send the request.
                         * FIXME: check returned value for possible errors
                         */
                        usb_hc_async_interrupt_in(hc, target,
                                        change_bitmap, byte_length, &actual_size,
                                        &handle);

                        usb_hc_async_wait_for(handle);

                        /*
                         * TODO: handle the changes.
                         */
                }
        }
}

/**
 * @}
 */