blob: 0b3c5cf111bbec808636ead655f851d951e87b19 [file] [log] [blame]
/*
* Copyright Runtime.io 2018. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
/** @file
* @brief UART transport for the mcumgr SMP protocol.
*/
#include <string.h>
#include <zephyr.h>
#include <init.h>
#include "net/buf.h"
#include "console/uart_mcumgr.h"
#include "mgmt/mgmt.h"
#include <mgmt/serial.h>
#include "mgmt/buf.h"
#include "mgmt/smp.h"
struct device;
static void smp_uart_process_rx_queue(struct k_work *work);
K_FIFO_DEFINE(smp_uart_rx_fifo);
K_WORK_DEFINE(smp_uart_work, smp_uart_process_rx_queue);
static struct mcumgr_serial_rx_ctxt smp_uart_rx_ctxt;
static struct zephyr_smp_transport smp_uart_transport;
/**
* Processes a single line (fragment) coming from the mcumgr UART driver.
*/
static void smp_uart_process_frag(struct uart_mcumgr_rx_buf *rx_buf)
{
struct net_buf *nb;
/* Decode the fragment and write the result to the global receive
* context.
*/
nb = mcumgr_serial_process_frag(&smp_uart_rx_ctxt,
rx_buf->data, rx_buf->length);
/* Release the encoded fragment. */
uart_mcumgr_free_rx_buf(rx_buf);
/* If a complete packet has been received, pass it to SMP for
* processing.
*/
if (nb != NULL) {
zephyr_smp_rx_req(&smp_uart_transport, nb);
}
}
static void smp_uart_process_rx_queue(struct k_work *work)
{
struct uart_mcumgr_rx_buf *rx_buf;
while ((rx_buf = k_fifo_get(&smp_uart_rx_fifo, K_NO_WAIT)) != NULL) {
smp_uart_process_frag(rx_buf);
}
}
/**
* Enqueues a received SMP fragment for later processing. This function
* executes in the interrupt context.
*/
static void smp_uart_rx_frag(struct uart_mcumgr_rx_buf *rx_buf)
{
k_fifo_put(&smp_uart_rx_fifo, rx_buf);
k_work_submit(&smp_uart_work);
}
static u16_t smp_uart_get_mtu(const struct net_buf *nb)
{
return CONFIG_MCUMGR_SMP_UART_MTU;
}
static int smp_uart_tx_pkt(struct zephyr_smp_transport *zst,
struct net_buf *nb)
{
int rc;
rc = uart_mcumgr_send(nb->data, nb->len);
mcumgr_buf_free(nb);
return rc;
}
static int smp_uart_init(struct device *dev)
{
ARG_UNUSED(dev);
zephyr_smp_transport_init(&smp_uart_transport, smp_uart_tx_pkt,
smp_uart_get_mtu);
uart_mcumgr_register(smp_uart_rx_frag);
return 0;
}
SYS_INIT(smp_uart_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);