Merge "trusty: spi: Add SPI proxy daemon" am: 28215f8d

# Copyright (C) 2020 The Android Open-Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

PRODUCT_PACKAGES += \

	spiproxyd \

// Copyright (C) 2020 The Android Open-Source Project

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

cc_binary {

    name: "spiproxyd",

    vendor: true,

    srcs: [

        "main.c",

    ],

    shared_libs: [

        "liblog",

        "libtrusty",

    ],

    init_rc: [

        "proxy.rc",

    ],

    cflags: [

        "-Wall",

        "-Werror",

    ],

}

/*

 * Copyright (C) 2020 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#define LOG_TAG "spiproxyd"

#include <assert.h>

#include <fcntl.h>

#include <getopt.h>

#include <log/log.h>

#include <stdlib.h>

#include <string.h>

#include <trusty/tipc.h>

#include <unistd.h>

int handle_msg(int trusty_dev_fd, int spi_dev_fd) {

    int rc;

    uint8_t msg_buf[4096];

    size_t msg_len;

    /* read request from SPI Trusty app */

    rc = read(trusty_dev_fd, &msg_buf, sizeof(msg_buf));

    if (rc < 0) {

        ALOGE("failed (%d) to read request from TA\n", rc);

        return rc;

    }

    msg_len = rc;

    /* forward request to SPI host device */

    rc = write(spi_dev_fd, &msg_buf, msg_len);

    if (rc < 0 || (size_t)rc != msg_len) {

        ALOGE("failed (%d) to forward request to host\n", rc);

        return rc < 0 ? rc : -1;

    }

    /* read response from SPI host device */

    rc = read(spi_dev_fd, &msg_buf, sizeof(msg_buf));

    if (rc < 0) {

        ALOGE("failed (%d) to read response from host\n", rc);

        return rc;

    }

    msg_len = rc;

    /* forward response to SPI Trusty app */

    rc = write(trusty_dev_fd, &msg_buf, msg_len);

    if (rc < 0 || (size_t)rc != msg_len) {

        ALOGE("failed (%d) to forward response to TA\n", rc);

        return rc < 0 ? rc : -1;

    }

    return 0;

}

int event_loop(int trusty_dev_fd, int spi_dev_fd) {

    while (true) {

        int rc = handle_msg(trusty_dev_fd, spi_dev_fd);

        if (rc < 0) {

            ALOGE("exiting event loop\n");

            return EXIT_FAILURE;

        }

    }

}

static void show_usage() {

    ALOGE("usage: spiproxyd -t TRUSTY_DEVICE -s SPI_DEVICE -p SPI_PROXY_PORT\n");

}

static void parse_args(int argc, char* argv[], const char** trusty_dev_name,

                       const char** spi_dev_name, const char** spi_proxy_port) {

    int opt;

    while ((opt = getopt(argc, argv, "ht:s:p:")) != -1) {

        switch (opt) {

            case 'h':

                show_usage();

                exit(EXIT_SUCCESS);

                break;

            case 't':

                *trusty_dev_name = strdup(optarg);

                break;

            case 's':

                *spi_dev_name = strdup(optarg);

                break;

            case 'p':

                *spi_proxy_port = strdup(optarg);

                break;

            default:

                show_usage();

                exit(EXIT_FAILURE);

                break;

        }

    }

    if (!*trusty_dev_name || !*spi_dev_name || !*spi_proxy_port) {

        show_usage();

        exit(EXIT_FAILURE);

    }

}

int main(int argc, char* argv[]) {

    int rc;

    const char* trusty_dev_name = NULL;

    const char* spi_dev_name = NULL;

    const char* spi_proxy_port = NULL;

    int trusty_dev_fd;

    int spi_dev_fd;

    parse_args(argc, argv, &trusty_dev_name, &spi_dev_name, &spi_proxy_port);

    rc = tipc_connect(trusty_dev_name, spi_proxy_port);

    if (rc < 0) {

        ALOGE("failed (%d) to connect to SPI proxy port\n", rc);

        return rc;

    }

    trusty_dev_fd = rc;

    rc = open(spi_dev_name, O_RDWR, 0);

    if (rc < 0) {

        ALOGE("failed (%d) to open SPI device\n", rc);

        return rc;

    }

    spi_dev_fd = rc;

    return event_loop(trusty_dev_fd, spi_dev_fd);

}

# Copyright (C) 2020 The Android Open-Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

service spiproxyd /vendor/bin/spiproxyd -t /dev/trusty-ipc-dev0 \

        -s /dev/vport3p2 -p com.android.trusty.spi.proxy

    class main

    user system

    group system

    oneshot