source: mainline/uspace/lib/usb/src/devdrv.c@ 159b91f4

/*
 * Copyright (c) 2011 Vojtech Horky
 * 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
 * @{
 */
/** @file
 * USB device driver framework.
 */
#include <usb/devdrv.h>
#include <usb/request.h>
#include <usb/debug.h>
#include <usb/dp.h>
#include <errno.h>
#include <str_error.h>
#include <assert.h>

static int generic_add_device(ddf_dev_t *);

static driver_ops_t generic_driver_ops = {
        .add_device = generic_add_device
};
static driver_t generic_driver = {
        .driver_ops = &generic_driver_ops
};

static usb_driver_t *driver = NULL;


/** Main routine of USB device driver.
 *
 * Under normal conditions, this function never returns.
 *
 * @param drv USB device driver structure.
 * @return Task exit status.
 */
int usb_driver_main(usb_driver_t *drv)
{
        assert(drv != NULL);

        /* Prepare the generic driver. */
        generic_driver.name = drv->name;

        driver = drv;

        return ddf_driver_main(&generic_driver);
}

/** Log out of memory error on given device.
 *
 * @param dev Device causing the trouble.
 */
static void usb_log_oom(ddf_dev_t *dev)
{
        usb_log_error("Out of memory when adding device `%s'.\n",
            dev->name);
}

/** Count number of pipes the driver expects.
 *
 * @param drv USB driver.
 * @return Number of pipes (excluding default control pipe).
 */
static size_t count_other_pipes(usb_driver_t *drv)
{
        size_t count = 0;
        if (drv->endpoints == NULL) {
                return 0;
        }

        while (drv->endpoints[count] != NULL) {
                count++;
        }

        return count;
}

/** Initialize endpoint pipes, excluding default control one.
 *
 * @param drv The device driver.
 * @param dev Device to be initialized.
 * @return Error code.
 */
static int initialize_other_pipes(usb_driver_t *drv, usb_device_t *dev)
{
        int rc;

        size_t pipe_count = count_other_pipes(drv);
        dev->pipes = malloc(sizeof(usb_endpoint_mapping_t) * pipe_count);
        if (dev->pipes == NULL) {
                usb_log_oom(dev->ddf_dev);
                return ENOMEM;
        }

        size_t i;

        /* Initialize to NULL first for rollback purposes. */
        for (i = 0; i < pipe_count; i++) {
                dev->pipes[i].pipe = NULL;
        }

        for (i = 0; i < pipe_count; i++) {
                dev->pipes[i].pipe = malloc(sizeof(usb_pipe_t));
                if (dev->pipes[i].pipe == NULL) {
                        usb_log_oom(dev->ddf_dev);
                        rc = ENOMEM;
                        goto rollback;
                }

                dev->pipes[i].description = drv->endpoints[i];
                dev->pipes[i].interface_no = dev->interface_no;
                dev->pipes[i].interface_setting = 0;
        }

        rc = usb_pipe_initialize_from_configuration(dev->pipes, pipe_count,
            dev->descriptors.configuration, dev->descriptors.configuration_size,
            &dev->wire);
        if (rc != EOK) {
                usb_log_error("Failed initializing USB endpoints: %s.\n",
                    str_error(rc));
                goto rollback;
        }

        /* Register the endpoints. */
        usb_hc_connection_t hc_conn;
        rc = usb_hc_connection_initialize_from_device(&hc_conn, dev->ddf_dev);
        if (rc != EOK) {
                usb_log_error(
                    "Failed initializing connection to host controller: %s.\n",
                    str_error(rc));
                goto rollback;
        }
        rc = usb_hc_connection_open(&hc_conn);
        if (rc != EOK) {
                usb_log_error("Failed to connect to host controller: %s.\n",
                    str_error(rc));
                goto rollback;
        }
        for (i = 0; i < pipe_count; i++) {
                if (dev->pipes[i].present) {
                        rc = usb_pipe_register(dev->pipes[i].pipe,
                            dev->pipes[i].descriptor->poll_interval,
                            &hc_conn);
                        /* Ignore error when operation not supported by HC. */
                        if ((rc != EOK) && (rc != ENOTSUP)) {
                                /* FIXME: what shall we do? */
                                dev->pipes[i].present = false;
                                free(dev->pipes[i].pipe);
                                dev->pipes[i].pipe = NULL;
                        }
                }
        }
        /* Ignoring errors here. */
        usb_hc_connection_close(&hc_conn);

        return EOK;

rollback:
        for (i = 0; i < pipe_count; i++) {
                if (dev->pipes[i].pipe != NULL) {
                        free(dev->pipes[i].pipe);
                }
        }
        free(dev->pipes);

        return rc;
}

/** Initialize all endpoint pipes.
 *
 * @param drv The driver.
 * @param dev The device to be initialized.
 * @return Error code.
 */
static int initialize_pipes(usb_device_t *dev)
{
        int rc;

        rc = usb_device_connection_initialize_from_device(&dev->wire,
            dev->ddf_dev);
        if (rc != EOK) {
                usb_log_error(
                    "Failed initializing connection on device `%s'. %s.\n",
                    dev->ddf_dev->name, str_error(rc));
                return rc;
        }

        rc = usb_pipe_initialize_default_control(&dev->ctrl_pipe,
            &dev->wire);
        if (rc != EOK) {
                usb_log_error("Failed to initialize default control pipe " \
                    "on device `%s': %s.\n",
                    dev->ddf_dev->name, str_error(rc));
                return rc;
        }

        rc = usb_pipe_probe_default_control(&dev->ctrl_pipe);
        if (rc != EOK) {
                usb_log_error(
                    "Probing default control pipe on device `%s' failed: %s.\n",
                    dev->ddf_dev->name, str_error(rc));
                return rc;
        }

        /* Get our interface. */
        dev->interface_no = usb_device_get_assigned_interface(dev->ddf_dev);

        /*
         * For further actions, we need open session on default control pipe.
         */
        rc = usb_pipe_start_session(&dev->ctrl_pipe);
        if (rc != EOK) {
                usb_log_error("Failed to start an IPC session: %s.\n",
                    str_error(rc));
                return rc;
        }

        /* Get the device descriptor. */
        rc = usb_request_get_device_descriptor(&dev->ctrl_pipe,
            &dev->descriptors.device);
        if (rc != EOK) {
                usb_log_error("Failed to retrieve device descriptor: %s.\n",
                    str_error(rc));
                return rc;
        }

        /* Get the full configuration descriptor. */
        rc = usb_request_get_full_configuration_descriptor_alloc(
            &dev->ctrl_pipe, 0, (void **) &dev->descriptors.configuration,
            &dev->descriptors.configuration_size);
        if (rc != EOK) {
                usb_log_error("Failed retrieving configuration descriptor: %s.\n",
                    dev->ddf_dev->name, str_error(rc));
                return rc;
        }

        if (driver->endpoints != NULL) {
                rc = initialize_other_pipes(driver, dev);
        }

        /* No checking here. */
        usb_pipe_end_session(&dev->ctrl_pipe);

        /* Rollback actions. */
        if (rc != EOK) {
                if (dev->descriptors.configuration != NULL) {
                        free(dev->descriptors.configuration);
                }
        }

        return rc;
}

/** Count number of alternate settings of a interface.
 *
 * @param config_descr Full configuration descriptor.
 * @param config_descr_size Size of @p config_descr in bytes.
 * @param interface_no Interface number.
 * @return Number of alternate interfaces for @p interface_no interface.
 */
static size_t count_alternate_interfaces(uint8_t *config_descr,
    size_t config_descr_size, int interface_no)
{
        assert(config_descr != NULL);
        usb_dp_parser_t dp_parser = {
                .nesting = usb_dp_standard_descriptor_nesting
        };
        usb_dp_parser_data_t dp_data = {
                .data = config_descr,
                .size = config_descr_size,
                .arg = NULL
        };

        size_t alternate_count = 0;

        uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
            &dp_data, config_descr);
        while (iface_ptr != NULL) {
                usb_standard_interface_descriptor_t *iface
                    = (usb_standard_interface_descriptor_t *) iface_ptr;
                if (iface->descriptor_type == USB_DESCTYPE_INTERFACE) {
                        if (iface->interface_number == interface_no) {
                                alternate_count++;
                        }
                }
                iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
                    config_descr, iface_ptr);
        }

        return alternate_count;
}

/** Initialize structures related to alternate interfaces.
 *
 * @param dev Device where alternate settings shall be initialized.
 * @return Error code.
 */
static int initialize_alternate_interfaces(usb_device_t *dev)
{
        if (dev->interface_no < 0) {
                dev->alternate_interfaces = NULL;
                return EOK;
        }

        usb_alternate_interfaces_t *alternates
            = malloc(sizeof(usb_alternate_interfaces_t));

        if (alternates == NULL) {
                return ENOMEM;
        }

        alternates->alternative_count
            = count_alternate_interfaces(dev->descriptors.configuration,
            dev->descriptors.configuration_size, dev->interface_no);

        if (alternates->alternative_count == 0) {
                free(alternates);
                return ENOENT;
        }

        alternates->alternatives = malloc(alternates->alternative_count
            * sizeof(usb_alternate_interface_descriptors_t));
        if (alternates->alternatives == NULL) {
                free(alternates);
                return ENOMEM;
        }

        alternates->current = 0;

        usb_dp_parser_t dp_parser = {
                .nesting = usb_dp_standard_descriptor_nesting
        };
        usb_dp_parser_data_t dp_data = {
                .data = dev->descriptors.configuration,
                .size = dev->descriptors.configuration_size,
                .arg = NULL
        };

        usb_alternate_interface_descriptors_t *cur_alt_iface
            = &alternates->alternatives[0];

        uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
            &dp_data, dp_data.data);
        while (iface_ptr != NULL) {
                usb_standard_interface_descriptor_t *iface
                    = (usb_standard_interface_descriptor_t *) iface_ptr;
                if ((iface->descriptor_type != USB_DESCTYPE_INTERFACE)
                    || (iface->interface_number != dev->interface_no)) {
                        iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser,
                            &dp_data,
                            dp_data.data, iface_ptr);
                        continue;
                }

                cur_alt_iface->interface = iface;
                cur_alt_iface->nested_descriptors = iface_ptr + sizeof(*iface);

                /* Find next interface to count size of nested descriptors. */
                iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
                    dp_data.data, iface_ptr);
                if (iface_ptr == NULL) {
                        uint8_t *next = dp_data.data + dp_data.size;
                        cur_alt_iface->nested_descriptors_size
                            = next - cur_alt_iface->nested_descriptors;
                } else {
                        cur_alt_iface->nested_descriptors_size
                            = iface_ptr - cur_alt_iface->nested_descriptors;
                }

                cur_alt_iface++;
        }

        dev->alternate_interfaces = alternates;

        return EOK;
}

/** Callback when new device is supposed to be controlled by this driver.
 *
 * This callback is a wrapper for USB specific version of @c add_device.
 *
 * @param gen_dev Device structure as prepared by DDF.
 * @return Error code.
 */
int generic_add_device(ddf_dev_t *gen_dev)
{
        assert(driver);
        assert(driver->ops);
        assert(driver->ops->add_device);

        int rc;

        usb_device_t *dev = malloc(sizeof(usb_device_t));
        if (dev == NULL) {
                usb_log_error("Out of memory when adding device `%s'.\n",
                    gen_dev->name);
                return ENOMEM;
        }


        dev->ddf_dev = gen_dev;
        dev->ddf_dev->driver_data = dev;
        dev->driver_data = NULL;
        dev->descriptors.configuration = NULL;

        rc = initialize_pipes(dev);
        if (rc != EOK) {
                free(dev);
                return rc;
        }

        (void) initialize_alternate_interfaces(dev);

        return driver->ops->add_device(dev);
}


/**
 * @}
 */