source: mainline/uspace/lib/drv/generic/remote_usbhid.c@ b9076db

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

#include <async.h>
#include <errno.h>
#include <assert.h>
#include <stdio.h>
#include <macros.h>

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

/** IPC methods for USB HID device interface. */
typedef enum {
        /** Get number of events reported in single burst.
         * Parameters: none
         * Answer:
         * - Size of one report in bytes.
         */
        IPC_M_USBHID_GET_EVENT_LENGTH,
        /** Get single event from the HID device.
         * The word single refers to set of individual events that were
         * available at particular point in time.
         * Parameters:
         * - flags
         * The call is followed by data read expecting two concatenated
         * arrays.
         * Answer:
         * - EOK - events returned
         * - EAGAIN - no event ready (only in non-blocking mode)
         *
         * It is okay if the client requests less data. Extra data must
         * be truncated by the driver.
         *
         * @todo Change this comment.
         */
        IPC_M_USBHID_GET_EVENT,

        /** Get the size of the report descriptor from the HID device.
         *
         * Parameters:
         * - none
         * Answer:
         * - EOK - method is implemented (expected always)
         * Parameters of the answer:
         * - Size of the report in bytes.
         */
        IPC_M_USBHID_GET_REPORT_DESCRIPTOR_LENGTH,

        /** Get the report descriptor from the HID device.
         *
         * Parameters:
         * - none
         * The call is followed by data read expecting the descriptor itself.
         * Answer:
         * - EOK - report descriptor returned.
         */
        IPC_M_USBHID_GET_REPORT_DESCRIPTOR
} usbhid_iface_funcs_t;

/** Ask for event array length.
 *
 * @param dev_sess Session to DDF device providing USB HID interface.
 *
 * @return Number of usages returned or an error code.
 *
 */
errno_t usbhid_dev_get_event_length(async_sess_t *dev_sess, size_t *size)
{
        if (!dev_sess)
                return EINVAL;

        async_exch_t *exch = async_exchange_begin(dev_sess);

        sysarg_t len;
        errno_t rc = async_req_1_1(exch, DEV_IFACE_ID(USBHID_DEV_IFACE),
            IPC_M_USBHID_GET_EVENT_LENGTH, &len);

        async_exchange_end(exch);

        if (rc == EOK) {
                if (size != NULL)
                        *size = (size_t) len;
        }

        return rc;
}

/** Request for next event from HID device.
 *
 * @param[in]  dev_sess    Session to DDF device providing USB HID interface.
 * @param[out] usage_pages Where to store usage pages.
 * @param[out] usages      Where to store usages (actual data).
 * @param[in]  usage_count Length of @p usage_pages and @p usages buffer
 *                         (in items, not bytes).
 * @param[out] actual_usage_count Number of usages actually returned by the
 *                                device driver.
 * @param[in] flags        Flags (see USBHID_IFACE_FLAG_*).
 *
 * @return Error code.
 *
 */
errno_t usbhid_dev_get_event(async_sess_t *dev_sess, uint8_t *buf,
    size_t size, size_t *actual_size, int *event_nr, unsigned int flags)
{
        if (!dev_sess)
                return EINVAL;

        if (buf == NULL)
                return ENOMEM;

        if (size == 0)
                return EINVAL;

        size_t buffer_size =  size;
        uint8_t *buffer = malloc(buffer_size);
        if (buffer == NULL)
                return ENOMEM;

        async_exch_t *exch = async_exchange_begin(dev_sess);

        ipc_call_t opening_request_call;
        aid_t opening_request = async_send_2(exch,
            DEV_IFACE_ID(USBHID_DEV_IFACE), IPC_M_USBHID_GET_EVENT,
            flags, &opening_request_call);

        if (opening_request == 0) {
                async_exchange_end(exch);
                free(buffer);
                return ENOMEM;
        }

        ipc_call_t data_request_call;
        aid_t data_request = async_data_read(exch, buffer, buffer_size,
            &data_request_call);

        async_exchange_end(exch);

        if (data_request == 0) {
                async_forget(opening_request);
                free(buffer);
                return ENOMEM;
        }

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

        if (opening_request_rc != EOK)
                return (errno_t) opening_request_rc;

        size_t act_size = IPC_GET_ARG2(data_request_call);

        /* Copy the individual items. */
        memcpy(buf, buffer, act_size);

        if (actual_size != NULL)
                *actual_size = act_size;

        if (event_nr != NULL)
                *event_nr = IPC_GET_ARG1(opening_request_call);

        return EOK;
}

errno_t usbhid_dev_get_report_descriptor_length(async_sess_t *dev_sess,
    size_t *size)
{
        if (!dev_sess)
                return EINVAL;

        async_exch_t *exch = async_exchange_begin(dev_sess);

        sysarg_t arg_size;
        errno_t rc = async_req_1_1(exch, DEV_IFACE_ID(USBHID_DEV_IFACE),
            IPC_M_USBHID_GET_REPORT_DESCRIPTOR_LENGTH, &arg_size);

        async_exchange_end(exch);

        if (rc == EOK) {
                if (size != NULL)
                        *size = (size_t) arg_size;
        }

        return rc;
}

errno_t usbhid_dev_get_report_descriptor(async_sess_t *dev_sess, uint8_t *buf,
    size_t size, size_t *actual_size)
{
        if (!dev_sess)
                return EINVAL;

        if (buf == NULL)
                return ENOMEM;

        if (size == 0)
                return EINVAL;

        async_exch_t *exch = async_exchange_begin(dev_sess);

        aid_t opening_request = async_send_1(exch,
            DEV_IFACE_ID(USBHID_DEV_IFACE), IPC_M_USBHID_GET_REPORT_DESCRIPTOR,
            NULL);
        if (opening_request == 0) {
                async_exchange_end(exch);
                return ENOMEM;
        }

        ipc_call_t data_request_call;
        aid_t data_request = async_data_read(exch, buf, size,
            &data_request_call);

        async_exchange_end(exch);

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

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

        if (opening_request_rc != EOK)
                return (errno_t) opening_request_rc;

        size_t act_size = IPC_GET_ARG2(data_request_call);

        if (actual_size != NULL)
                *actual_size = act_size;

        return EOK;
}

static void remote_usbhid_get_event_length(ddf_fun_t *, void *, ipc_call_t *);
static void remote_usbhid_get_event(ddf_fun_t *, void *, ipc_call_t *);
static void remote_usbhid_get_report_descriptor_length(ddf_fun_t *, void *, ipc_call_t *);
static void remote_usbhid_get_report_descriptor(ddf_fun_t *, void *, ipc_call_t *);

/** Remote USB HID interface operations. */
static const remote_iface_func_ptr_t remote_usbhid_iface_ops [] = {
        [IPC_M_USBHID_GET_EVENT_LENGTH] = remote_usbhid_get_event_length,
        [IPC_M_USBHID_GET_EVENT] = remote_usbhid_get_event,
        [IPC_M_USBHID_GET_REPORT_DESCRIPTOR_LENGTH] =
            remote_usbhid_get_report_descriptor_length,
        [IPC_M_USBHID_GET_REPORT_DESCRIPTOR] = remote_usbhid_get_report_descriptor
};

/** Remote USB HID interface structure.
 */
const remote_iface_t remote_usbhid_iface = {
        .method_count = ARRAY_SIZE(remote_usbhid_iface_ops),
        .methods = remote_usbhid_iface_ops
};


void remote_usbhid_get_event_length(ddf_fun_t *fun, void *iface,
    ipc_call_t *call)
{
        printf("remote_usbhid_get_event_length()\n");

        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_event_length) {
                printf("Get event length not set!\n");
                async_answer_0(call, ENOTSUP);
                return;
        }

        size_t len = hid_iface->get_event_length(fun);
        async_answer_1(call, EOK, len);
}

void remote_usbhid_get_event(ddf_fun_t *fun, void *iface,
    ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_event) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        unsigned int flags = DEV_IPC_GET_ARG1(*call);

        ipc_call_t data;
        size_t len;
        if (!async_data_read_receive(&data, &len)) {
                async_answer_0(call, EPARTY);
                return;
        }

        if (len == 0) {
                async_answer_0(&data, EINVAL);
                async_answer_0(call, EINVAL);
                return;
        }

        errno_t rc;

        uint8_t *event = malloc(len);
        if (event == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(call, ENOMEM);
                return;
        }

        size_t act_length;
        int event_nr;
        rc = hid_iface->get_event(fun, event, len, &act_length, &event_nr, flags);
        if (rc != EOK) {
                free(event);
                async_answer_0(&data, rc);
                async_answer_0(call, rc);
                return;
        }
        if (act_length >= len) {
                /* This shall not happen. */
                // FIXME: how about an assert here?
                act_length = len;
        }

        async_data_read_finalize(&data, event, act_length);

        free(event);

        async_answer_1(call, EOK, event_nr);
}

void remote_usbhid_get_report_descriptor_length(ddf_fun_t *fun, void *iface,
    ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_report_descriptor_length) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        size_t len = hid_iface->get_report_descriptor_length(fun);
        async_answer_1(call, EOK, (sysarg_t) len);
}

void remote_usbhid_get_report_descriptor(ddf_fun_t *fun, void *iface,
    ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_report_descriptor) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        ipc_call_t data;
        size_t len;
        if (!async_data_read_receive(&data, &len)) {
                async_answer_0(call, EINVAL);
                return;
        }

        if (len == 0) {
                async_answer_0(&data, EINVAL);
                async_answer_0(call, EINVAL);
                return;
        }

        uint8_t *descriptor = malloc(len);
        if (descriptor == NULL) {
                async_answer_0(&data, ENOMEM);
                async_answer_0(call, ENOMEM);
                return;
        }

        size_t act_len = 0;
        errno_t rc = hid_iface->get_report_descriptor(fun, descriptor, len,
            &act_len);
        if (act_len > len) {
                rc = ELIMIT;
        }
        if (rc != EOK) {
                free(descriptor);
                async_answer_0(&data, rc);
                async_answer_0(call, rc);
                return;
        }

        async_data_read_finalize(&data, descriptor, act_len);
        async_answer_0(call, EOK);

        free(descriptor);
}

/**
 * @}
 */