termiosdevice.h

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/* SPDX-License-Identifier: BSD-2-Clause */

 
/*
 * Copyright (C) 2014, 2017 embedded brains GmbH & Co. KG
 *
 * 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.
 *
 * 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.
 */
 
#ifndef _RTEMS_TERMIOSDEVICE_H
#define _RTEMS_TERMIOSDEVICE_H
 
#include <rtems/thread.h>
#include <rtems/rtems/intr.h>
 
#include <sys/ioccom.h>
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
 
struct rtems_libio_open_close_args;
struct rtems_termios_tty;
struct termios;


typedef struct rtems_termios_device_context {
  union {
    /* Used for TERMIOS_POLLED and TERMIOS_IRQ_DRIVEN */
    rtems_interrupt_lock interrupt;
 
    /* Used for TERMIOS_IRQ_SERVER_DRIVEN and TERMIOS_TASK_DRIVEN */
    rtems_mutex mutex;
  } lock;
 
  void ( *lock_acquire )(
    struct rtems_termios_device_context *,
    rtems_interrupt_lock_context *
  );
 
  void ( *lock_release )(
    struct rtems_termios_device_context *,
    rtems_interrupt_lock_context *
  );
} rtems_termios_device_context;
 
typedef enum {
  TERMIOS_POLLED,
  TERMIOS_IRQ_DRIVEN,
  TERMIOS_TASK_DRIVEN,
  TERMIOS_IRQ_SERVER_DRIVEN
} rtems_termios_device_mode;

typedef struct {
  bool (*first_open)(
    struct rtems_termios_tty           *tty,
    rtems_termios_device_context       *context,
    struct termios                     *term,
    struct rtems_libio_open_close_args *args
  );

  void (*last_close)(
    struct rtems_termios_tty           *tty,
    rtems_termios_device_context       *context,
    struct rtems_libio_open_close_args *args
  );

  int (*poll_read)(rtems_termios_device_context *context);

  void (*write)(
    rtems_termios_device_context *context,
    const char *buf,
    size_t len
  );

  bool (*set_attributes)(
    rtems_termios_device_context *context,
    const struct termios         *term
  );

  int (*ioctl)(
    rtems_termios_device_context *context,
    ioctl_command_t               request,
    void                         *buffer
  );

  rtems_termios_device_mode mode;
} rtems_termios_device_handler;

typedef struct {
  void (*stop_remote_tx)(rtems_termios_device_context *context);

  void (*start_remote_tx)(rtems_termios_device_context *context);
} rtems_termios_device_flow;
 
void rtems_termios_device_lock_acquire_default(
  rtems_termios_device_context *ctx,
  rtems_interrupt_lock_context *lock_context
);
 
void rtems_termios_device_lock_release_default(
  rtems_termios_device_context *ctx,
  rtems_interrupt_lock_context *lock_context
);

static inline void rtems_termios_device_context_initialize(
  rtems_termios_device_context *context,
  const char                   *name
)
{
  rtems_interrupt_lock_initialize( &context->lock.interrupt, name );
  context->lock_acquire = rtems_termios_device_lock_acquire_default;
  context->lock_release = rtems_termios_device_lock_release_default;
}

#define RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER( name ) \
  { \
    { RTEMS_INTERRUPT_LOCK_INITIALIZER( name ) }, \
    rtems_termios_device_lock_acquire_default, \
    rtems_termios_device_lock_release_default \
  }

static inline void rtems_termios_device_lock_acquire(
  rtems_termios_device_context *context,
  rtems_interrupt_lock_context *lock_context
)
{
  ( *context->lock_acquire )( context, lock_context );
}

static inline void rtems_termios_device_lock_release(
  rtems_termios_device_context *context,
  rtems_interrupt_lock_context *lock_context
)
{
  ( *context->lock_release )( context, lock_context );
}

 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
#endif /* _RTEMS_TERMIOSDEVICE_H */