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/*
* Copyright (C) 2017 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 "libnos_datagram"
#include <cutils/log.h>
#include <nos/device.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/types.h>
#include <poll.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
/*****************************************************************************/
/* TODO: #include <linux/citadel.h> */
#define CITADEL_IOC_MAGIC 'c'
struct citadel_ioc_tpm_datagram {
__u64 buf;
__u32 len;
__u32 command;
};
#define CITADEL_IOC_TPM_DATAGRAM _IOW(CITADEL_IOC_MAGIC, 1, \
struct citadel_ioc_tpm_datagram)
#define CITADEL_IOC_RESET _IO(CITADEL_IOC_MAGIC, 2)
/*****************************************************************************/
#define DEV_CITADEL "/dev/citadel0"
static uint8_t in_buf[MAX_DEVICE_TRANSFER];
static int read_datagram(void *ctx, uint32_t command, uint8_t *buf, uint32_t len) {
struct citadel_ioc_tpm_datagram dg = {
.buf = (unsigned long)in_buf,
.len = len,
.command = command,
};
int ret;
int fd;
if (!ctx) {
ALOGE("%s: invalid (NULL) device\n", __func__);
return -ENODEV;
}
fd = *(int *)ctx;
if (fd < 0) {
ALOGE("%s: invalid device\n", __func__);
return -ENODEV;
}
if (len > MAX_DEVICE_TRANSFER) {
ALOGE("%s: invalid len (%d > %d)\n", __func__,
len, MAX_DEVICE_TRANSFER);
return -E2BIG;
}
ret = ioctl(fd, CITADEL_IOC_TPM_DATAGRAM, &dg);
if (ret < 0) {
ALOGE("can't send spi message: %s", strerror(errno));
return -errno;
}
memcpy(buf, in_buf, len);
return 0;
}
static uint8_t out_buf[MAX_DEVICE_TRANSFER];
static int write_datagram(void *ctx, uint32_t command, const uint8_t *buf, uint32_t len) {
struct citadel_ioc_tpm_datagram dg = {
.buf = (unsigned long)out_buf,
.len = len,
.command = command,
};
int ret;
int fd;
if (!ctx) {
ALOGE("%s: invalid (NULL) device\n", __func__);
return -ENODEV;
}
fd = *(int *)ctx;
if (fd < 0) {
ALOGE("%s: invalid device\n", __func__);
return -ENODEV;
}
if (len > MAX_DEVICE_TRANSFER) {
ALOGE("%s: invalid len (%d > %d)\n", __func__, len,
MAX_DEVICE_TRANSFER);
return -E2BIG;
}
memcpy(out_buf, buf, len);
ret = ioctl(fd, CITADEL_IOC_TPM_DATAGRAM, &dg);
if (ret < 0) {
ALOGE("can't send spi message: %s", strerror(errno));
return -errno;
}
return 0;
}
static int wait_for_interrupt(void *ctx, int msecs) {
int fd = *(int *)ctx;
struct pollfd fds = {fd, POLLIN, 0};
int rv;
rv = poll(&fds, 1 /*nfds*/, msecs);
if (rv < 0) {
ALOGE("poll: %s", strerror(errno));
}
return rv;
}
static int reset(void *ctx) {
int ret;
int fd;
if (!ctx) {
ALOGE("%s: invalid (NULL) device\n", __func__);
return -ENODEV;
}
fd = *(int *)ctx;
if (fd < 0) {
ALOGE("%s: invalid device\n", __func__);
return -ENODEV;
}
ret = ioctl(fd, CITADEL_IOC_RESET);
if (ret < 0) {
ALOGE("can't reset Citadel: %s", strerror(errno));
return -errno;
}
return 0;
}
static void close_device(void *ctx) {
int fd;
if (!ctx) {
ALOGE("%s: invalid (NULL) device (ignored)\n", __func__);
return;
}
fd = *(int *)ctx;
if (fd < 0) {
ALOGE("%s: invalid device (ignored)\n", __func__);
return;
}
if (close(fd) < 0)
ALOGE("Problem closing device (ignored): %s", strerror(errno));
free(ctx);
}
int nos_device_open(const char *device_name, struct nos_device *dev) {
int fd, *new_fd;
fd = open(device_name ? device_name : DEV_CITADEL, O_RDWR);
if (fd < 0) {
ALOGE("can't open device: %s", strerror(errno));
return -errno;
}
new_fd = (int *)malloc(sizeof(int));
if (!new_fd) {
ALOGE("can't malloc new fd: %s", strerror(errno));
close(fd);
return -ENOMEM;
}
*new_fd = fd;
dev->ctx = new_fd;
dev->ops.read = read_datagram;
dev->ops.write = write_datagram;
dev->ops.wait_for_interrupt = wait_for_interrupt;
dev->ops.reset = reset;
dev->ops.close = close_device;
return 0;
}
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