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/****************************************************************************
* arch/arm/src/calypso/calypso_serial.c
*
* (C) 2011 Stefan Richter <ichgeh@l--putt.de>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <nuttx/fs.h>
#include <nuttx/serial.h>
#include <errno.h>
#include <debug.h>
#include <string.h>
#include "uart.h"
#include <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_write(void *file, const char *s, const int len);
static ssize_t sc_console_write(file_t *filep, FAR const char *buffer, size_t buflen)
{
int ret = sercomm_write(filep, buffer, buflen);
if(ret < 0)
return ret;
else
return buflen;
}
/* 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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