source: mainline/uspace/drv/bus/usb/usbhub/usbhub.c@ ee9ea16

/*
 * 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 drvusbhub
 * @{
 */
/** @file
 * @brief usb hub main functionality
 */

#include <ddf/driver.h>
#include <bool.h>
#include <errno.h>
#include <str_error.h>
#include <inttypes.h>

#include <usb_iface.h>
#include <usb/ddfiface.h>
#include <usb/descriptor.h>
#include <usb/dev/recognise.h>
#include <usb/dev/request.h>
#include <usb/classes/hub.h>
#include <usb/dev/poll.h>
#include <stdio.h>

#include "usbhub.h"
#include "usbhub_private.h"
#include "port_status.h"
#include <usb/usb.h>
#include <usb/dev/pipes.h>
#include <usb/classes/classes.h>


static usb_hub_info_t * usb_hub_info_create(usb_device_t *usb_dev);
static int usb_hub_process_hub_specific_info(usb_hub_info_t *hub_info);
static int usb_hub_set_configuration(usb_hub_info_t *hub_info);
static int usb_hub_start_hub_fibril(usb_hub_info_t *hub_info);
static int usb_process_hub_over_current(usb_hub_info_t *hub_info,
    usb_hub_status_t status);
static int usb_process_hub_local_power_change(usb_hub_info_t *hub_info,
    usb_hub_status_t status);
static void usb_hub_process_global_interrupt(usb_hub_info_t *hub_info);
static void usb_hub_polling_terminated_callback(usb_device_t *device,
    bool was_error, void *data);


//*********************************************
//
//  hub driver code, initialization
//
//*********************************************

/**
 * Initialize hub device driver fibril
 *
 * Creates hub representation and fibril that periodically checks hub`s status.
 * Hub representation is passed to the fibril.
 * @param usb_dev generic usb device information
 * @return error code
 */
int usb_hub_add_device(usb_device_t *usb_dev) {
        if (!usb_dev) return EINVAL;
        usb_hub_info_t *hub_info = usb_hub_info_create(usb_dev);

        //create hc connection
        usb_log_debug("Initializing USB wire abstraction.\n");
        int opResult = usb_hc_connection_initialize_from_device(
            &hub_info->connection, hub_info->usb_device->ddf_dev);
        if (opResult != EOK) {
                usb_log_error("Could not initialize connection to device: %s\n",
                    str_error(opResult));
                free(hub_info);
                return opResult;
        }

        //set hub configuration
        opResult = usb_hub_set_configuration(hub_info);
        if (opResult != EOK) {
                usb_log_error("Could not set hub configuration: %s\n",
                    str_error(opResult));
                free(hub_info);
                return opResult;
        }
        //get port count and create attached_devs
        opResult = usb_hub_process_hub_specific_info(hub_info);
        if (opResult != EOK) {
                usb_log_error("Could process hub specific info, %s\n",
                    str_error(opResult));
                free(hub_info);
                return opResult;
        }

        usb_log_debug("Creating 'hub' function in DDF.\n");
        ddf_fun_t *hub_fun = ddf_fun_create(hub_info->usb_device->ddf_dev,
            fun_exposed, "hub");
        assert(hub_fun != NULL);
        hub_fun->ops = NULL;

        opResult = ddf_fun_bind(hub_fun);
        assert(opResult == EOK);

        opResult = usb_hub_start_hub_fibril(hub_info);
        if (opResult != EOK)
                free(hub_info);
        return opResult;
}

/** Callback for polling hub for changes.
 *
 * @param dev Device where the change occured.
 * @param change_bitmap Bitmap of changed ports.
 * @param change_bitmap_size Size of the bitmap in bytes.
 * @param arg Custom argument, points to @c usb_hub_info_t.
 * @return Whether to continue polling.
 */
bool hub_port_changes_callback(usb_device_t *dev,
    uint8_t *change_bitmap, size_t change_bitmap_size, void *arg) {
        usb_log_debug("hub_port_changes_callback\n");
        usb_hub_info_t *hub = (usb_hub_info_t *) arg;

        /* FIXME: check that we received enough bytes. */
        if (change_bitmap_size == 0) {
                goto leave;
        }

        bool change;
        change = ((uint8_t*) change_bitmap)[0] & 1;
        if (change) {
                usb_hub_process_global_interrupt(hub);
        }

        size_t port;
        for (port = 1; port < hub->port_count + 1; port++) {
                bool change = (change_bitmap[port / 8] >> (port % 8)) % 2;
                if (change) {
                        usb_hub_process_port_interrupt(hub, port);
                }
        }
leave:
        /* FIXME: proper interval. */
        async_usleep(1000 * 250);

        return true;
}


//*********************************************
//
//  support functions
//
//*********************************************

/**
 * create usb_hub_info_t structure
 *
 * Does only basic copying of known information into new structure.
 * @param usb_dev usb device structure
 * @return basic usb_hub_info_t structure
 */
static usb_hub_info_t * usb_hub_info_create(usb_device_t *usb_dev)
{
        usb_hub_info_t *result = malloc(sizeof (usb_hub_info_t));
        if (!result)
            return NULL;

        result->usb_device = usb_dev;
        result->status_change_pipe = usb_dev->pipes[0].pipe;
        result->control_pipe = &usb_dev->ctrl_pipe;
        result->is_default_address_used = false;

        result->ports = NULL;
        result->port_count = (size_t) - 1;
        fibril_mutex_initialize(&result->port_mutex);

        fibril_mutex_initialize(&result->pending_ops_mutex);
        fibril_condvar_initialize(&result->pending_ops_cv);
        result->pending_ops_count = 0;

        return result;
}

/**
 * Load hub-specific information into hub_info structure and process if needed
 *
 * Particularly read port count and initialize structure holding port
 * information. If there are non-removable devices, start initializing them.
 * This function is hub-specific and should be run only after the hub is
 * configured using usb_hub_set_configuration function.
 * @param hub_info hub representation
 * @return error code
 */
int usb_hub_process_hub_specific_info(usb_hub_info_t *hub_info)
{
        // get hub descriptor
        usb_log_debug("Retrieving descriptor\n");
        uint8_t serialized_descriptor[USB_HUB_MAX_DESCRIPTOR_SIZE];
        int opResult;

        size_t received_size;
        opResult = usb_request_get_descriptor(hub_info->control_pipe,
            USB_REQUEST_TYPE_CLASS, USB_REQUEST_RECIPIENT_DEVICE,
            USB_DESCTYPE_HUB, 0, 0, serialized_descriptor,
            USB_HUB_MAX_DESCRIPTOR_SIZE, &received_size);

        if (opResult != EOK) {
                usb_log_error("Failed to receive hub descriptor: %s.\n",
                    str_error(opResult));
                return opResult;
        }
        usb_log_debug2("Parsing descriptor\n");
        usb_hub_descriptor_t descriptor;
        opResult = usb_deserialize_hub_desriptor(
                serialized_descriptor, received_size, &descriptor);
        if (opResult != EOK) {
                usb_log_error("Could not parse descriptor: %s\n",
                    str_error(opResult));
                return opResult;
        }
        usb_log_debug("Setting port count to %d.\n", descriptor.ports_count);
        hub_info->port_count = descriptor.ports_count;

        hub_info->ports =
            malloc(sizeof(usb_hub_port_t) * (hub_info->port_count + 1));
        if (!hub_info->ports) {
                return ENOMEM;
        }

        size_t port;
        for (port = 0; port < hub_info->port_count + 1; ++port) {
                usb_hub_port_init(&hub_info->ports[port]);
        }

        const bool is_power_switched =
            !(descriptor.hub_characteristics & HUB_CHAR_NO_POWER_SWITCH_FLAG);
        if (is_power_switched) {
                usb_log_debug("Hub power switched\n");
                const bool per_port_power = descriptor.hub_characteristics
                    & HUB_CHAR_POWER_PER_PORT_FLAG;

                for (port = 1; port <= hub_info->port_count; ++port) {
                        usb_log_debug("Powering port %zu.\n", port);
                        opResult = usb_hub_set_port_feature(
                            hub_info->control_pipe,
                            port, USB_HUB_FEATURE_PORT_POWER);
                        if (opResult != EOK) {
                                usb_log_error("Cannot power on port %zu: %s.\n",
                                    port, str_error(opResult));
                        } else {
                                if (!per_port_power) {
                                        usb_log_debug(
                                            "Ganged power switching mode, "
                                            "one port is enough.\n");
                                        break;
                                }
                        }
                }

        } else {
                usb_log_debug("Power not switched, not going to be powered\n");
        }
        return EOK;
}

/**
 * Set configuration of hub
 *
 * Check whether there is at least one configuration and sets the first one.
 * This function should be run prior to running any hub-specific action.
 * @param hub_info hub representation
 * @return error code
 */
static int usb_hub_set_configuration(usb_hub_info_t *hub_info) {
        //device descriptor
        usb_standard_device_descriptor_t *std_descriptor
            = &hub_info->usb_device->descriptors.device;
        usb_log_debug("Hub has %d configurations\n",
            std_descriptor->configuration_count);
        if (std_descriptor->configuration_count < 1) {
                usb_log_error("There are no configurations available\n");
                return EINVAL;
        }

        usb_standard_configuration_descriptor_t *config_descriptor
            = (usb_standard_configuration_descriptor_t *)
            hub_info->usb_device->descriptors.configuration;

        /* Set configuration. */
        int opResult = usb_request_set_configuration(
            &hub_info->usb_device->ctrl_pipe,
            config_descriptor->configuration_number);

        if (opResult != EOK) {
                usb_log_error("Failed to set hub configuration: %s.\n",
                    str_error(opResult));
                return opResult;
        }
        usb_log_debug("\tUsed configuration %d\n",
            config_descriptor->configuration_number);

        return EOK;
}

/**
 * create and start fibril with hub control loop
 *
 * Before the fibril is started, the control pipe and host controller
 * connection of the hub is open.
 *
 * @param hub_info hub representing structure
 * @return error code
 */
static int usb_hub_start_hub_fibril(usb_hub_info_t *hub_info) {
        int rc;

        rc = usb_device_auto_poll(hub_info->usb_device, 0,
            hub_port_changes_callback, ((hub_info->port_count + 1) / 8) + 1,
            usb_hub_polling_terminated_callback, hub_info);
        if (rc != EOK) {
                usb_log_error("Failed to create polling fibril: %s.\n",
                    str_error(rc));
                free(hub_info);
                return rc;
        }

        usb_log_info("Controlling hub `%s' (%zu ports).\n",
            hub_info->usb_device->ddf_dev->name, hub_info->port_count);
        return EOK;
}

//*********************************************
//
//  change handling functions
//
//*********************************************

/**
 * process hub over current change
 *
 * This means either to power off the hub or power it on.
 * @param hub_info hub instance
 * @param status hub status bitmask
 * @return error code
 */
static int usb_process_hub_over_current(usb_hub_info_t *hub_info,
    usb_hub_status_t status) {
        int opResult;
        if (usb_hub_is_status(status, USB_HUB_FEATURE_HUB_OVER_CURRENT)) {
                //poweroff all ports
                unsigned int port;
                for (port = 1; port <= hub_info->port_count; ++port) {
                        opResult = usb_hub_clear_port_feature(
                            hub_info->control_pipe, port,
                            USB_HUB_FEATURE_PORT_POWER);
                        if (opResult != EOK) {
                                usb_log_warning(
                                    "Cannot power off port %d;  %s\n",
                                    port, str_error(opResult));
                        }
                }
        } else {
                //power all ports
                unsigned int port;
                for (port = 1; port <= hub_info->port_count; ++port) {
                        opResult = usb_hub_set_port_feature(
                            hub_info->control_pipe, port,
                            USB_HUB_FEATURE_PORT_POWER);
                        if (opResult != EOK) {
                                usb_log_warning(
                                    "Cannot power off port %d;  %s\n",
                                    port, str_error(opResult));
                        }
                }
        }
        return opResult;
}

/**
 * process hub local power change
 *
 * This change is ignored.
 * @param hub_info hub instance
 * @param status hub status bitmask
 * @return error code
 */
static int usb_process_hub_local_power_change(usb_hub_info_t *hub_info,
    usb_hub_status_t status) {
        int opResult = EOK;
        opResult = usb_hub_clear_feature(hub_info->control_pipe,
            USB_HUB_FEATURE_C_HUB_LOCAL_POWER);
        if (opResult != EOK) {
                usb_log_error("Cannnot clear hub power change flag: "
                    "%s\n",
                    str_error(opResult));
        }
        return opResult;
}

/**
 * process hub interrupts
 *
 * The change can be either in the over-current condition or
 * local-power change.
 * @param hub_info hub instance
 */
static void usb_hub_process_global_interrupt(usb_hub_info_t *hub_info) {
        usb_log_debug("Global interrupt on a hub\n");
        usb_pipe_t *pipe = hub_info->control_pipe;
        int opResult;

        usb_port_status_t status;
        size_t rcvd_size;
        usb_device_request_setup_packet_t request;
        //int opResult;
        usb_hub_set_hub_status_request(&request);
        //endpoint 0

        opResult = usb_pipe_control_read(
            pipe,
            &request, sizeof (usb_device_request_setup_packet_t),
            &status, 4, &rcvd_size
            );
        if (opResult != EOK) {
                usb_log_error("Could not get hub status: %s\n",
                    str_error(opResult));
                return;
        }
        if (rcvd_size != sizeof (usb_port_status_t)) {
                usb_log_error("Received status has incorrect size\n");
                return;
        }
        //port reset
        if (
            usb_hub_is_status(status, 16 + USB_HUB_FEATURE_C_HUB_OVER_CURRENT)) {
                usb_process_hub_over_current(hub_info, status);
        }
        if (
            usb_hub_is_status(status, 16 + USB_HUB_FEATURE_C_HUB_LOCAL_POWER)) {
                usb_process_hub_local_power_change(hub_info, status);
        }
}

/**
 * callback called from hub polling fibril when the fibril terminates
 *
 * Should perform a cleanup - deletes hub_info.
 * @param device usb device afected
 * @param was_error indicates that the fibril is stoped due to an error
 * @param data pointer to usb_hub_info_t structure
 */
static void usb_hub_polling_terminated_callback(usb_device_t *device,
    bool was_error, void *data) {
        usb_hub_info_t * hub = data;
        assert(hub);

        fibril_mutex_lock(&hub->pending_ops_mutex);

        /* The device is dead. However there might be some pending operations
         * that we need to wait for.
         * One of them is device adding in progress.
         * The respective fibril is probably waiting for status change
         * in port reset (port enable) callback.
         * Such change would never come (otherwise we would not be here).
         * Thus, we would flush all pending port resets.
         */
        if (hub->pending_ops_count > 0) {
                fibril_mutex_lock(&hub->port_mutex);
                size_t port;
                for (port = 0; port < hub->port_count; port++) {
                        usb_hub_port_t *the_port = hub->ports + port;
                        fibril_mutex_lock(&the_port->reset_mutex);
                        the_port->reset_completed = true;
                        the_port->reset_okay = false;
                        fibril_condvar_broadcast(&the_port->reset_cv);
                        fibril_mutex_unlock(&the_port->reset_mutex);
                }
                fibril_mutex_unlock(&hub->port_mutex);
        }
        /* And now wait for them. */
        while (hub->pending_ops_count > 0) {
                fibril_condvar_wait(&hub->pending_ops_cv,
                    &hub->pending_ops_mutex);
        }
        fibril_mutex_unlock(&hub->pending_ops_mutex);

        usb_device_destroy(hub->usb_device);

        free(hub->ports);
        free(hub);
}




/**
 * @}
 */