331 lines
8.1 KiB
C
Executable File
331 lines
8.1 KiB
C
Executable File
/*
|
|
* Copyright (c) 2006-2023, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2023-11-21 Shell init ver.
|
|
*/
|
|
|
|
#define DBG_TAG "drivers.serial"
|
|
#define DBG_LVL DBG_INFO
|
|
#include <rtdbg.h>
|
|
|
|
#include <rthw.h>
|
|
#include <rtthread.h>
|
|
#include <rtdevice.h>
|
|
#include <terminal/terminal.h>
|
|
|
|
#define TTY_NAME_PREFIX "S" /* (S)erial */
|
|
#define LWP_TTY_WORKQUEUE_PRIORITY 3
|
|
|
|
struct serial_tty_context
|
|
{
|
|
struct rt_serial_device *parent;
|
|
struct rt_device_notify backup_notify;
|
|
struct rt_work work;
|
|
};
|
|
|
|
static struct rt_workqueue *_ttyworkq; /* system work queue */
|
|
|
|
static rt_atomic_t _device_id_counter = 0;
|
|
|
|
static long get_dec_digits(rt_ubase_t val)
|
|
{
|
|
long result = 1;
|
|
while (1)
|
|
{
|
|
if (val < 10)
|
|
return result;
|
|
if (val < 100)
|
|
return result + 1;
|
|
if (val < 1000)
|
|
return result + 2;
|
|
if (val < 10000)
|
|
return result + 3;
|
|
val /= 10000U;
|
|
result += 4;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static char *alloc_device_name(void)
|
|
{
|
|
char *tty_dev_name;
|
|
unsigned int devid = rt_atomic_add(&_device_id_counter, 1);
|
|
long digits_len = (sizeof(TTY_NAME_PREFIX) - 1) /* raw prefix */
|
|
+ get_dec_digits(devid) + 1; /* tailing \0 */
|
|
|
|
tty_dev_name = rt_malloc(digits_len);
|
|
if (tty_dev_name)
|
|
rt_sprintf(tty_dev_name, "%s%u", TTY_NAME_PREFIX, devid);
|
|
return tty_dev_name;
|
|
}
|
|
|
|
static void _tty_rx_notify(struct rt_device *device)
|
|
{
|
|
lwp_tty_t tp;
|
|
struct serial_tty_context *softc;
|
|
|
|
tp = rt_container_of(device, struct lwp_tty, parent);
|
|
RT_ASSERT(tp);
|
|
|
|
softc = tty_softc(tp);
|
|
|
|
if (_ttyworkq)
|
|
rt_workqueue_submit_work(_ttyworkq, &softc->work, 0);
|
|
}
|
|
|
|
static void _tty_rx_worker(struct rt_work *work, void *data)
|
|
{
|
|
char input;
|
|
rt_ssize_t readbytes;
|
|
lwp_tty_t tp = data;
|
|
struct serial_tty_context *softc;
|
|
struct rt_serial_device *serial;
|
|
|
|
tty_lock(tp);
|
|
|
|
while (1)
|
|
{
|
|
softc = tty_softc(tp);
|
|
serial = softc->parent;
|
|
readbytes = rt_device_read(&serial->parent, -1, &input, 1);
|
|
if (readbytes != 1)
|
|
{
|
|
break;
|
|
}
|
|
|
|
ttydisc_rint(tp, input, 0);
|
|
}
|
|
|
|
ttydisc_rint_done(tp);
|
|
tty_unlock(tp);
|
|
}
|
|
|
|
rt_inline void _setup_serial(struct rt_serial_device *serial, lwp_tty_t tp,
|
|
struct serial_tty_context *softc)
|
|
{
|
|
struct rt_device_notify notify;
|
|
|
|
softc->backup_notify = serial->rx_notify;
|
|
notify.dev = &tp->parent;
|
|
notify.notify = _tty_rx_notify;
|
|
|
|
rt_device_init(&serial->parent);
|
|
|
|
rt_work_init(&softc->work, _tty_rx_worker, tp);
|
|
rt_device_control(&serial->parent, RT_DEVICE_CTRL_NOTIFY_SET, ¬ify);
|
|
}
|
|
|
|
rt_inline void _restore_serial(struct rt_serial_device *serial, lwp_tty_t tp,
|
|
struct serial_tty_context *softc)
|
|
{
|
|
rt_device_control(&serial->parent, RT_DEVICE_CTRL_NOTIFY_SET, &softc->backup_notify);
|
|
}
|
|
|
|
static int _serial_isbusy(struct rt_serial_device *serial)
|
|
{
|
|
rt_thread_t user_thread = rt_console_current_user();
|
|
rt_thread_t self_thread = rt_thread_self();
|
|
|
|
return rt_console_get_device() == &serial->parent &&
|
|
(user_thread != RT_NULL && user_thread != self_thread);
|
|
}
|
|
|
|
static void serial_tty_outwakeup(struct lwp_tty *tp)
|
|
{
|
|
char out_char;
|
|
int len;
|
|
struct serial_tty_context *context = tty_softc(tp);
|
|
struct rt_serial_device *device;
|
|
|
|
if (!context || !context->parent)
|
|
{
|
|
LOG_E("%s: Data corruption", __func__);
|
|
return;
|
|
}
|
|
|
|
device = context->parent;
|
|
|
|
if (_serial_isbusy(device))
|
|
{
|
|
return ;
|
|
}
|
|
|
|
while ((len = ttydisc_getc(tp, &out_char, sizeof(out_char))) != 0)
|
|
{
|
|
device->ops->putc(device, out_char);
|
|
|
|
/* discard remaining if emergency output is happened */
|
|
if (_serial_isbusy(device))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int serial_tty_open(struct lwp_tty *tp)
|
|
{
|
|
struct serial_tty_context *softc;
|
|
struct rt_serial_device *serial;
|
|
rt_err_t error;
|
|
int oflags;
|
|
|
|
softc = tty_softc(tp);
|
|
serial = softc->parent;
|
|
|
|
LOG_D("%s", __func__);
|
|
|
|
rt_device_control(&serial->parent, RT_DEVICE_CTRL_CONSOLE_OFLAG, &oflags);
|
|
|
|
error = rt_device_open(&serial->parent, oflags);
|
|
|
|
if (!error)
|
|
{
|
|
/**
|
|
* to avoid driver accesssing null data,
|
|
* these are setup only after tty is registered
|
|
*/
|
|
_setup_serial(serial, tp, softc);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void serial_tty_close(struct lwp_tty *tp)
|
|
{
|
|
struct serial_tty_context *softc;
|
|
struct rt_serial_device *serial;
|
|
softc = tty_softc(tp);
|
|
serial = softc->parent;
|
|
|
|
LOG_D("%s", __func__);
|
|
|
|
_restore_serial(serial, tp, softc);
|
|
rt_device_close(&serial->parent);
|
|
}
|
|
|
|
static int serial_tty_ioctl(struct lwp_tty *tp, rt_ubase_t cmd, rt_caddr_t data,
|
|
struct rt_thread *td)
|
|
{
|
|
int error;
|
|
switch (cmd)
|
|
{
|
|
case TCSETS:
|
|
case TCSETSW:
|
|
case TCSETSF:
|
|
RT_ASSERT(tp->t_devswsoftc);
|
|
struct serial_tty_context *softc = (struct serial_tty_context *)(tp->t_devswsoftc);
|
|
struct rt_serial_device *serial = softc->parent;
|
|
struct termios *termios = (struct termios *)data;
|
|
rt_device_control(&(serial->parent), cmd, termios);
|
|
error = -ENOIOCTL;
|
|
default:
|
|
/**
|
|
* Note: for the most case, we don't let serial layer handle ioctl,
|
|
* for that they can't act properly regarding to the process
|
|
* management system, since it is unawared of that. So a ENOSYS is
|
|
* returned and caused the TTY layer to handle ioctl itself.
|
|
*/
|
|
error = -ENOSYS;
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static struct lwp_ttydevsw serial_ttydevsw = {
|
|
.tsw_open = serial_tty_open,
|
|
.tsw_close = serial_tty_close,
|
|
.tsw_ioctl = serial_tty_ioctl,
|
|
.tsw_outwakeup = serial_tty_outwakeup,
|
|
};
|
|
|
|
rt_err_t rt_hw_serial_register_tty(struct rt_serial_device *serial)
|
|
{
|
|
rt_err_t rc;
|
|
lwp_tty_t tty;
|
|
char *dev_name;
|
|
struct serial_tty_context *softc;
|
|
|
|
if (serial->rx_notify.dev)
|
|
{
|
|
return -RT_EBUSY;
|
|
}
|
|
|
|
softc = rt_malloc(sizeof(struct serial_tty_context));
|
|
if (softc)
|
|
{
|
|
dev_name = alloc_device_name();
|
|
if (dev_name)
|
|
{
|
|
softc->parent = serial;
|
|
tty = lwp_tty_create(&serial_ttydevsw, softc);
|
|
if (tty)
|
|
{
|
|
rc = lwp_tty_register(tty, dev_name);
|
|
|
|
if (rc != RT_EOK)
|
|
{
|
|
rt_free(tty);
|
|
rt_free(softc);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
rt_free(softc);
|
|
rc = -RT_ENOMEM;
|
|
}
|
|
|
|
rt_free(dev_name);
|
|
}
|
|
else
|
|
{
|
|
rt_free(softc);
|
|
rc = -RT_ENOMEM;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
rc = -RT_ENOMEM;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
rt_err_t rt_hw_serial_unregister_tty(struct rt_serial_device *serial)
|
|
{
|
|
rt_device_t tty_dev;
|
|
lwp_tty_t tp;
|
|
struct serial_tty_context *softc;
|
|
|
|
tty_dev = serial->rx_notify.dev;
|
|
tp = rt_container_of(tty_dev, struct lwp_tty, parent);
|
|
|
|
/* restore serial setting */
|
|
softc = tty_softc(tp);
|
|
serial->rx_notify = softc->backup_notify;
|
|
|
|
tty_rel_gone(tp);
|
|
|
|
/* device unregister? */
|
|
rt_device_destroy(&tp->parent);
|
|
/* resource free? */
|
|
lwp_tty_delete(tp);
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
static int _tty_workqueue_init(void)
|
|
{
|
|
if (_ttyworkq != RT_NULL)
|
|
return RT_EOK;
|
|
|
|
_ttyworkq = rt_workqueue_create("ttyworkq", RT_SYSTEM_WORKQUEUE_STACKSIZE,
|
|
LWP_TTY_WORKQUEUE_PRIORITY);
|
|
RT_ASSERT(_ttyworkq != RT_NULL);
|
|
|
|
return RT_EOK;
|
|
}
|
|
INIT_PREV_EXPORT(_tty_workqueue_init);
|