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/****************************************************************************
* drivers/sercomm/console.c
* Driver for NuttX Console
*
* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2011 Stefan Richter <ichgeh@l--putt.de>
*
* This source code is derivated from Osmocom-BB project and was
* relicensed as BSD with permission from original authors.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
**************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/serial/serial.h>
#include <errno.h>
#include <debug.h>
#include <string.h>
#include "uart.h"
#include <nuttx/sercomm/sercomm.h>
/* stubs to make serial driver happy */
void sercomm_recvchars(void *a) { }
void sercomm_xmitchars(void *a) { }
/* Stubs to make memory allocator happy */
void cons_puts(void *foo){}
void delay_ms(int ms){}
/************************************************************************************
* Fileops Prototypes and Structures
************************************************************************************/
typedef FAR struct file file_t;
static ssize_t sc_console_read(file_t *filep, FAR char *buffer, size_t buflen);
static ssize_t sc_console_write(file_t *filep, FAR const char *buffer, size_t buflen);
static int sc_console_ioctl(file_t *filep, int cmd, unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int sc_console_poll(file_t *filep, FAR struct pollfd *fds, bool setup);
#endif
static const struct file_operations g_sercom_console_ops =
{
0, /* open, always opened */
0, /* close, stays open */
sc_console_read, /* read */
sc_console_write, /* write */
0, /* seek, not supported */
sc_console_ioctl, /* ioctl */
#ifndef CONFIG_DISABLE_POLL
sc_console_poll /* poll */
#endif
};
/****************************************************************************
* Helper functions
****************************************************************************/
static FAR uart_dev_t *readdev = NULL;
static struct msgb *recvmsg = NULL;
static void recv_cb(uint8_t dlci, struct msgb *msg)
{
sem_post(&readdev->recvsem);
recvmsg = msg;
}
/****************************************************************************
* Fileops
****************************************************************************/
/* XXX: recvmsg is overwritten when multiple msg arrive! */
static ssize_t sc_console_read(file_t *filep, FAR char *buffer, size_t buflen)
{
size_t len;
struct msgb *tmp;
/* Wait until data is received */
while(recvmsg == NULL) {
sem_wait(&readdev->recvsem);
}
len = recvmsg->len > buflen ? buflen : recvmsg->len;
memcpy(buffer, msgb_get(recvmsg, len), len);
if(recvmsg->len == 0) {
/* prevent inconsistent msg by first invalidating it, then free it */
tmp = recvmsg;
recvmsg = NULL;
msgb_free(tmp);
}
return len;
}
/* XXX: redirect to old Osmocom-BB comm/sercomm_cons.c -> 2 buffers */
extern int sercomm_puts(const char *s);
static ssize_t sc_console_write(file_t *filep, FAR const char *buffer, size_t buflen)
{
int i, cnt;
char dstbuf[32];
if (buflen >= 31)
cnt = 31;
else
cnt = buflen;
memcpy(dstbuf, buffer, cnt);
dstbuf[cnt] = '\0';
/* print part of our buffer */
sercomm_puts(dstbuf);
/* wait a little bit to get data transfered */
up_mdelay(1);
return cnt;
}
/* Forward ioctl to uart driver */
static int sc_console_ioctl(struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
return dev->ops->ioctl(filep, cmd, arg);
}
/************************************************************************************
* Public Functions
************************************************************************************/
/* Use sercomm on uart driver, register console driver */
int sercomm_register(FAR const char *path, FAR uart_dev_t *dev)
{
/* XXX: initialize MODEMUART to be used for sercomm*/
uart_init(SERCOMM_UART_NR, 1);
uart_baudrate(SERCOMM_UART_NR, UART_115200);
readdev = dev;
sercomm_register_rx_cb(SC_DLCI_LOADER, &recv_cb);
sem_init(&dev->xmit.sem, 0, 1);
sem_init(&dev->recv.sem, 0, 1);
sem_init(&dev->closesem, 0, 1);
sem_init(&dev->xmitsem, 0, 0);
sem_init(&dev->recvsem, 0, 0);
#ifndef CONFIG_DISABLE_POLL
sem_init(&dev->pollsem, 0, 1);
#endif
dbg("Registering %s\n", path);
return register_driver(path, &g_sercom_console_ops, 0666, NULL);
}
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