sc16is752.h

/*
 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <info@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifndef _DEV_SERIAL_SC16IS752_H
#define _DEV_SERIAL_SC16IS752_H

#include <sys/ioccom.h>

#include <rtems/termiostypes.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef enum {
  SC16IS752_MODE_RS232,
  SC16IS752_MODE_RS485
} sc16is752_mode;

typedef struct sc16is752_context sc16is752_context;

struct sc16is752_context {
  rtems_termios_device_context base;

  int (*write_reg)(
    sc16is752_context *ctx,
    uint8_t addr,
    const uint8_t *data,
    size_t len
  );

  int (*read_reg)(
    sc16is752_context *ctx,
    uint8_t addr,
    uint8_t *data,
    size_t len
  );

  int (*read_2_reg)(
    sc16is752_context *ctx,
    uint8_t addr_0,
    uint8_t addr_1,
    uint8_t data[2]
  );

  bool (*first_open)(sc16is752_context *ctx);

  void (*last_close)(sc16is752_context *ctx);

  bool (*install_irq)(sc16is752_context *ctx);

  void (*remove_irq)(sc16is752_context *ctx);

  sc16is752_mode mode;

  uint32_t input_frequency;

  rtems_termios_tty *tty;

  uint8_t ier;

  uint8_t tx_in_progress;

  uint8_t tx_fifo_free;

  uint8_t lcr;

  uint8_t efcr;
};

typedef struct {
  sc16is752_context base;

  int fd;

  uint8_t cs;

  uint32_t speed_hz;

  const char *spi_path;
} sc16is752_spi_context;

typedef struct {
  sc16is752_context base;

  int fd;

  const char *bus_path;
} sc16is752_i2c_context;

const rtems_termios_device_handler sc16is752_termios_handler;

void sc16is752_interrupt_handler(void *arg);

rtems_status_code sc16is752_spi_create(
  sc16is752_spi_context *ctx,
  const char            *device_path
);

#define SC16IS752_SET_SLEEP_MODE _IOW('d', 0, int)

#define SC16IS752_SET_IOCONTROL _IOW('d', 1, uint8_t)

#define SC16IS752_SET_IODIR _IOW('d', 2, uint8_t)

#define SC16IS752_SET_IOSTATE _IOW('d', 3, uint8_t)

#define SC16IS752_GET_SLEEP_MODE _IOR('d', 0, int)

#define SC16IS752_GET_IOCONTROL _IOR('d', 1, uint8_t)

#define SC16IS752_GET_IODIR _IOR('d', 2, uint8_t)

#define SC16IS752_GET_IOSTATE _IOR('d', 3, uint8_t)

#define SC16IS752_IOCONTROL_SRESET (1u << 3)
#define SC16IS752_IOCONTROL_GPIO_3_0_OR_MODEM (1u << 2)
#define SC16IS752_IOCONTROL_GPIO_7_4_OR_MODEM (1u << 1)
#define SC16IS752_IOCONTROL_IOLATCH (1u << 0)

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _DEV_SERIAL_SC16IS752_H */