source: mainline/uspace/lib/drv/generic/remote_usb.c@ 8351f9a4

/*
 * Copyright (c) 2010 Vojtech Horky
 * Copyright (c) 2011 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 libdrv
 * @{
 */
/** @file
 */

#include <async.h>
#include <macros.h>
#include <errno.h>
#include <devman.h>

#include "usb_iface.h"
#include "ddf/driver.h"


usb_dev_session_t *usb_dev_connect(devman_handle_t handle)
{
        return devman_device_connect(EXCHANGE_PARALLEL, handle, IPC_FLAG_BLOCKING);
}

usb_dev_session_t *usb_dev_connect_to_self(ddf_dev_t *dev)
{
        // TODO All usb requests are atomic so this is safe,
        // it will need to change once USING EXCHANGE PARALLEL is safe with
        // devman_parent_device_connect
        return devman_parent_device_connect(EXCHANGE_ATOMIC,
            ddf_dev_get_handle(dev), IPC_FLAG_BLOCKING);
}

void usb_dev_disconnect(usb_dev_session_t *sess)
{
        if (sess)
                async_hangup(sess);
}

typedef enum {
        IPC_M_USB_GET_MY_INTERFACE,
        IPC_M_USB_GET_MY_DEVICE_HANDLE,
        IPC_M_USB_RESERVE_DEFAULT_ADDRESS,
        IPC_M_USB_RELEASE_DEFAULT_ADDRESS,
        IPC_M_USB_DEVICE_ENUMERATE,
        IPC_M_USB_DEVICE_REMOVE,
        IPC_M_USB_REGISTER_ENDPOINT,
        IPC_M_USB_UNREGISTER_ENDPOINT,
        IPC_M_USB_READ,
        IPC_M_USB_WRITE,
} usb_iface_funcs_t;

/** Tell interface number given device can use.
 * @param[in] exch IPC communication exchange
 * @param[in] handle Id of the device
 * @param[out] usb_iface Assigned USB interface
 * @return Error code.
 */
int usb_get_my_interface(async_exch_t *exch, int *usb_iface)
{
        if (!exch)
                return EBADMEM;
        sysarg_t iface_no;
        const int ret = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_GET_MY_INTERFACE, &iface_no);
        if (ret == EOK && usb_iface)
                *usb_iface = (int)iface_no;
        return ret;
}

/** Tell devman handle of the usb device function.
 * @param[in] exch IPC communication exchange
 * @param[out] handle devman handle of the HC used by the target device.
 * @return Error code.
 */
int usb_get_my_device_handle(async_exch_t *exch, devman_handle_t *handle)
{
        devman_handle_t h = 0;
        const int ret = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_GET_MY_DEVICE_HANDLE, &h);
        if (ret == EOK && handle)
                *handle = (devman_handle_t)h;
        return ret;
}

/** Reserve default USB address.
 * @param[in] exch IPC communication exchange
 * @param[in] speed Communication speed of the newly attached device
 * @return Error code.
 */
int usb_reserve_default_address(async_exch_t *exch, usb_speed_t speed)
{
        if (!exch)
                return EBADMEM;
        return async_req_2_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_RESERVE_DEFAULT_ADDRESS, speed);
}

/** Release default USB address.
 * @param[in] exch IPC communication exchange
 * @return Error code.
 */
int usb_release_default_address(async_exch_t *exch)
{
        if (!exch)
                return EBADMEM;
        return async_req_1_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_RELEASE_DEFAULT_ADDRESS);
}

/** Trigger USB device enumeration
 * @param[in] exch IPC communication exchange
 * @param[out] handle Identifier of the newly added device (if successful)
 * @return Error code.
 */
int usb_device_enumerate(async_exch_t *exch, unsigned port)
{
        if (!exch)
                return EBADMEM;
        const int ret = async_req_2_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_DEVICE_ENUMERATE, port);
        return ret;
}

/** Trigger USB device enumeration
 * @param[in] exch IPC communication exchange
 * @param[in] handle Identifier of the device
 * @return Error code.
 */
int usb_device_remove(async_exch_t *exch, unsigned port)
{
        if (!exch)
                return EBADMEM;
        return async_req_2_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_DEVICE_REMOVE, port);
}

int static_assert[sizeof(sysarg_t) >= 4 ? 1 : -1];
typedef union {
        uint8_t arr[sizeof(sysarg_t)];
        sysarg_t arg;
} pack8_t;

int usb_register_endpoint(async_exch_t *exch, usb_endpoint_t endpoint,
    usb_transfer_type_t type, usb_direction_t direction,
    size_t mps, unsigned packets, unsigned interval)
{
        if (!exch)
                return EBADMEM;
        pack8_t pack;
        pack.arr[0] = type;
        pack.arr[1] = direction;
        pack.arr[2] = interval;
        pack.arr[3] = packets;

        return async_req_4_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_REGISTER_ENDPOINT, endpoint, pack.arg, mps);

}

int usb_unregister_endpoint(async_exch_t *exch, usb_endpoint_t endpoint,
    usb_direction_t direction)
{
        if (!exch)
                return EBADMEM;
        return async_req_3_0(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_UNREGISTER_ENDPOINT, endpoint, direction);
}

int usb_read(async_exch_t *exch, usb_endpoint_t endpoint, uint64_t setup,
    void *data, size_t size, size_t *rec_size)
{
        if (!exch)
                return EBADMEM;

        if (size == 0 && setup == 0)
                return EOK;

        /* Make call identifying target USB device and type of transfer. */
        aid_t opening_request = async_send_4(exch,
            DEV_IFACE_ID(USB_DEV_IFACE), IPC_M_USB_READ, endpoint,
            (setup & UINT32_MAX), (setup >> 32), NULL);

        if (opening_request == 0) {
                return ENOMEM;
        }

        /* Retrieve the data. */
        ipc_call_t data_request_call;
        aid_t data_request =
            async_data_read(exch, data, size, &data_request_call);

        if (data_request == 0) {
                // FIXME: How to let the other side know that we want to abort?
                async_forget(opening_request);
                return ENOMEM;
        }

        /* Wait for the answer. */
        sysarg_t data_request_rc;
        sysarg_t opening_request_rc;
        async_wait_for(data_request, &data_request_rc);
        async_wait_for(opening_request, &opening_request_rc);

        if (data_request_rc != EOK) {
                /* Prefer the return code of the opening request. */
                if (opening_request_rc != EOK) {
                        return (int) opening_request_rc;
                } else {
                        return (int) data_request_rc;
                }
        }
        if (opening_request_rc != EOK) {
                return (int) opening_request_rc;
        }

        *rec_size = IPC_GET_ARG2(data_request_call);
        return EOK;
}

int usb_write(async_exch_t *exch, usb_endpoint_t endpoint, uint64_t setup,
    const void *data, size_t size)
{
        if (!exch)
                return EBADMEM;

        if (size == 0 && setup == 0)
                return EOK;

        aid_t opening_request = async_send_5(exch,
            DEV_IFACE_ID(USB_DEV_IFACE), IPC_M_USB_WRITE, endpoint, size,
            (setup & UINT32_MAX), (setup >> 32), NULL);

        if (opening_request == 0) {
                return ENOMEM;
        }

        /* Send the data if any. */
        if (size > 0) {
                const int ret = async_data_write_start(exch, data, size);
                if (ret != EOK) {
                        async_forget(opening_request);
                        return ret;
                }
        }

        /* Wait for the answer. */
        sysarg_t opening_request_rc;
        async_wait_for(opening_request, &opening_request_rc);

        return (int) opening_request_rc;
}

static void remote_usb_get_my_interface(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_get_my_device_handle(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_reserve_default_address(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_release_default_address(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_device_enumerate(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_device_remove(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_register_endpoint(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_unregister_endpoint(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usb_read(ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call);
static void remote_usb_write(ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call);

/** Remote USB interface operations. */
static const remote_iface_func_ptr_t remote_usb_iface_ops [] = {
        [IPC_M_USB_GET_MY_INTERFACE] = remote_usb_get_my_interface,
        [IPC_M_USB_GET_MY_DEVICE_HANDLE] = remote_usb_get_my_device_handle,
        [IPC_M_USB_RESERVE_DEFAULT_ADDRESS] = remote_usb_reserve_default_address,
        [IPC_M_USB_RELEASE_DEFAULT_ADDRESS] = remote_usb_release_default_address,
        [IPC_M_USB_DEVICE_ENUMERATE] = remote_usb_device_enumerate,
        [IPC_M_USB_DEVICE_REMOVE] = remote_usb_device_remove,
        [IPC_M_USB_REGISTER_ENDPOINT] = remote_usb_register_endpoint,
        [IPC_M_USB_UNREGISTER_ENDPOINT] = remote_usb_unregister_endpoint,
        [IPC_M_USB_READ] = remote_usb_read,
        [IPC_M_USB_WRITE] = remote_usb_write,
};

/** Remote USB interface structure.
 */
const remote_iface_t remote_usb_iface = {
        .method_count = ARRAY_SIZE(remote_usb_iface_ops),
        .methods = remote_usb_iface_ops,
};

void remote_usb_get_my_interface(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->get_my_interface == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        int iface_no;
        const int ret = usb_iface->get_my_interface(fun, &iface_no);
        if (ret != EOK) {
                async_answer_0(callid, ret);
        } else {
                async_answer_1(callid, EOK, iface_no);
        }
}

void remote_usb_get_my_device_handle(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->get_my_device_handle == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        devman_handle_t handle;
        const int ret = usb_iface->get_my_device_handle(fun, &handle);
        if (ret != EOK) {
                async_answer_0(callid, ret);
        }

        async_answer_1(callid, EOK, (sysarg_t) handle);
}

void remote_usb_reserve_default_address(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->reserve_default_address == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        usb_speed_t speed = DEV_IPC_GET_ARG1(*call);
        const int ret = usb_iface->reserve_default_address(fun, speed);
        async_answer_0(callid, ret);
}

void remote_usb_release_default_address(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->release_default_address == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const int ret = usb_iface->release_default_address(fun);
        async_answer_0(callid, ret);
}

static void remote_usb_device_enumerate(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->device_enumerate == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const unsigned port = DEV_IPC_GET_ARG1(*call);
        const int ret = usb_iface->device_enumerate(fun, port);
        async_answer_0(callid, ret);
}

static void remote_usb_device_remove(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        const usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (usb_iface->device_remove == NULL) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const unsigned port = DEV_IPC_GET_ARG1(*call);
        const int ret = usb_iface->device_remove(fun, port);
        async_answer_0(callid, ret);
}

static void remote_usb_register_endpoint(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (!usb_iface->register_endpoint) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const usb_endpoint_t endpoint = DEV_IPC_GET_ARG1(*call);
        const pack8_t pack = { .arg = DEV_IPC_GET_ARG2(*call)};
        const size_t max_packet_size = DEV_IPC_GET_ARG3(*call);

        const usb_transfer_type_t transfer_type = pack.arr[0];
        const usb_direction_t direction = pack.arr[1];
        unsigned packets = pack.arr[2];
        unsigned interval = pack.arr[3];

        const int ret = usb_iface->register_endpoint(fun, endpoint,
            transfer_type, direction, max_packet_size, packets, interval);

        async_answer_0(callid, ret);
}

static void remote_usb_unregister_endpoint(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        usb_iface_t *usb_iface = (usb_iface_t *) iface;

        if (!usb_iface->unregister_endpoint) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        usb_endpoint_t endpoint = (usb_endpoint_t) DEV_IPC_GET_ARG1(*call);
        usb_direction_t direction = (usb_direction_t) DEV_IPC_GET_ARG2(*call);

        int rc = usb_iface->unregister_endpoint(fun, endpoint, direction);

        async_answer_0(callid, rc);
}

typedef struct {
        ipc_callid_t caller;
        ipc_callid_t data_caller;
        void *buffer;
} async_transaction_t;

static void async_transaction_destroy(async_transaction_t *trans)
{
        if (trans == NULL) {
                return;
        }
        if (trans->buffer != NULL) {
                free(trans->buffer);
        }

        free(trans);
}

static async_transaction_t *async_transaction_create(ipc_callid_t caller)
{
        async_transaction_t *trans = malloc(sizeof(async_transaction_t));
        if (trans == NULL) {
                return NULL;
        }

        trans->caller = caller;
        trans->data_caller = 0;
        trans->buffer = NULL;

        return trans;
}

static void callback_out(int outcome, void *arg)
{
        async_transaction_t *trans = arg;

        async_answer_0(trans->caller, outcome);

        async_transaction_destroy(trans);
}

static void callback_in(int outcome, size_t actual_size, void *arg)
{
        async_transaction_t *trans = (async_transaction_t *)arg;

        if (outcome != EOK) {
                async_answer_0(trans->caller, outcome);
                if (trans->data_caller) {
                        async_answer_0(trans->data_caller, EINTR);
                }
                async_transaction_destroy(trans);
                return;
        }

        if (trans->data_caller) {
                async_data_read_finalize(trans->data_caller,
                    trans->buffer, actual_size);
        }

        async_answer_0(trans->caller, EOK);

        async_transaction_destroy(trans);
}

void remote_usb_read(
    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
{
        assert(fun);
        assert(iface);
        assert(call);

        const usb_iface_t *usb_iface = iface;

        if (!usb_iface->read) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const usb_endpoint_t ep = DEV_IPC_GET_ARG1(*call);
        const uint64_t setup =
            ((uint64_t)DEV_IPC_GET_ARG2(*call)) |
            (((uint64_t)DEV_IPC_GET_ARG3(*call)) << 32);

        async_transaction_t *trans = async_transaction_create(callid);
        if (trans == NULL) {
                async_answer_0(callid, ENOMEM);
                return;
        }

        size_t size = 0;
        if (!async_data_read_receive(&trans->data_caller, &size)) {
                async_answer_0(callid, EPARTY);
                return;
        }

        trans->buffer = malloc(size);
        if (trans->buffer == NULL) {
                async_answer_0(trans->data_caller, ENOMEM);
                async_answer_0(callid, ENOMEM);
                async_transaction_destroy(trans);
        }

        const int rc = usb_iface->read(
            fun, ep, setup, trans->buffer, size, callback_in, trans);

        if (rc != EOK) {
                async_answer_0(trans->data_caller, rc);
                async_answer_0(callid, rc);
                async_transaction_destroy(trans);
        }
}

void remote_usb_write(
    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
{
        assert(fun);
        assert(iface);
        assert(call);

        const usb_iface_t *usb_iface = iface;

        if (!usb_iface->write) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        const usb_endpoint_t ep = DEV_IPC_GET_ARG1(*call);
        const size_t data_buffer_len = DEV_IPC_GET_ARG2(*call);
        const uint64_t setup =
            ((uint64_t)DEV_IPC_GET_ARG3(*call)) |
            (((uint64_t)DEV_IPC_GET_ARG4(*call)) << 32);

        async_transaction_t *trans = async_transaction_create(callid);
        if (trans == NULL) {
                async_answer_0(callid, ENOMEM);
                return;
        }

        size_t size = 0;
        if (data_buffer_len > 0) {
                const int rc = async_data_write_accept(&trans->buffer, false,
                    1, data_buffer_len, 0, &size);

                if (rc != EOK) {
                        async_answer_0(callid, rc);
                        async_transaction_destroy(trans);
                        return;
                }
        }

        const int rc = usb_iface->write(
            fun, ep, setup, trans->buffer, size, callback_out, trans);

        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_transaction_destroy(trans);
        }
}
/**
 * @}
 */