/**
* @file
*
* RTEMS termios device support internal data structures
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* 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 __TERMIOSTYPES_H
#define __TERMIOSTYPES_H
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/assoc.h>
#include <rtems/chain.h>
#include <rtems/thread.h>
#include <sys/ioccom.h>
#include <stdint.h>
#include <termios.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup TermiostypesSupport RTEMS Termios Device Support
*
* @ingroup libcsupport
*
* @brief RTEMS Termios Device Support Internal Data Structures
*/
/*
* Wakeup callback data structure
*/
struct ttywakeup {
void (*sw_pfn)(struct termios *tty, void *arg);
void *sw_arg;
};
/*
* Variables associated with the character buffer
*/
struct rtems_termios_rawbuf {
char *theBuf;
volatile unsigned int Head;
volatile unsigned int Tail;
volatile unsigned int Size;
rtems_binary_semaphore Semaphore;
};
typedef enum {
TERMIOS_POLLED,
TERMIOS_IRQ_DRIVEN,
TERMIOS_TASK_DRIVEN,
TERMIOS_IRQ_SERVER_DRIVEN
} rtems_termios_device_mode;
struct rtems_termios_tty;
/**
* @brief Termios device context.
*
* @see RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER(),
* rtems_termios_device_context_initialize() and
* rtems_termios_device_install().
*/
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 or 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;
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
);
/**
* @brief Initializes a device context.
*
* @param[in] context The Termios device context.
* @param[in] name The name for the interrupt lock. This name must be a
* string persistent throughout the life time of this lock. The name is only
* used if profiling is enabled.
*/
RTEMS_INLINE_ROUTINE 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;
}
/**
* @brief Initializer for static initialization of Termios device contexts.
*
* @param name The name for the interrupt lock. It must be a string. The name
* is only used if profiling is enabled.
*/
#define RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER( name ) \
{ \
{ RTEMS_INTERRUPT_LOCK_INITIALIZER( name ) }, \
rtems_termios_device_lock_acquire_default, \
rtems_termios_device_lock_release_default \
}
/**
* @brief Termios device handler.
*
* @see rtems_termios_device_install().
*/
typedef struct {
/**
* @brief First open of this device.
*
* @param[in] tty The Termios control. This parameter may be passed to
* interrupt service routines since it must be provided for the
* rtems_termios_enqueue_raw_characters() and
* rtems_termios_dequeue_characters() functions.
* @param[in] context The Termios device context.
* @param[in] term The current Termios attributes.
* @param[in] args The open/close arguments. This is parameter provided to
* support legacy drivers. It must not be used by new drivers.
*
* @retval true Successful operation.
* @retval false Cannot open device.
*
* @see rtems_termios_get_device_context() and rtems_termios_set_best_baud().
*/
bool (*first_open)(
struct rtems_termios_tty *tty,
rtems_termios_device_context *context,
struct termios *term,
rtems_libio_open_close_args_t *args
);
/**
* @brief Last close of this device.
*
* @param[in] tty The Termios control.
* @param[in] context The Termios device context.
* @param[in] args The open/close arguments. This is parameter provided to
* support legacy drivers. It must not be used by new drivers.
*/
void (*last_close)(
struct rtems_termios_tty *tty,
rtems_termios_device_context *context,
rtems_libio_open_close_args_t *args
);
/**
* @brief Polled read.
*
* In case mode is TERMIOS_IRQ_DRIVEN, TERMIOS_IRQ_SERVER_DRIVEN or
* TERMIOS_TASK_DRIVEN, then data is received via
* rtems_termios_enqueue_raw_characters().
*
* @param[in] context The Termios device context.
*
* @retval char The received data encoded as unsigned char.
* @retval -1 No data currently available.
*/
int (*poll_read)(rtems_termios_device_context *context);
/**
* @brief Polled write in case mode is TERMIOS_POLLED or write support
* otherwise.
*
* @param[in] context The Termios device context.
* @param[in] buf The output buffer.
* @param[in] len The output buffer length in characters.
*/
void (*write)(
rtems_termios_device_context *context,
const char *buf,
size_t len
);
/**
* @brief Set attributes after a Termios settings change.
*
* @param[in] context The Termios device context.
* @param[in] term The new Termios attributes.
*
* @retval true Successful operation.
* @retval false Invalid attributes.
*/
bool (*set_attributes)(
rtems_termios_device_context *context,
const struct termios *term
);
/**
* @brief IO control handler.
*
* Invoked in case the Termios layer cannot deal with the IO request.
*
* @param[in] context The Termios device context.
* @param[in] request The IO control request.
* @param[in] buffer The IO control buffer.
*/
int (*ioctl)(
rtems_termios_device_context *context,
ioctl_command_t request,
void *buffer
);
/**
* @brief Termios device mode.
*/
rtems_termios_device_mode mode;
} rtems_termios_device_handler;
/**
* @brief Termios device flow control handler.
*
* @see rtems_termios_device_install().
*/
typedef struct {
/**
* @brief Indicate to stop remote transmitter.
*
* @param[in] context The Termios device context.
*/
void (*stop_remote_tx)(rtems_termios_device_context *context);
/**
* @brief Indicate to start remote transmitter.
*
* @param[in] context The Termios device context.
*/
void (*start_remote_tx)(rtems_termios_device_context *context);
} rtems_termios_device_flow;
/**
* @brief Termios device node for installed devices.
*
* @see rtems_termios_device_install().
*/
typedef struct rtems_termios_device_node {
rtems_chain_node node;
rtems_device_major_number major;
rtems_device_minor_number minor;
const rtems_termios_device_handler *handler;
const rtems_termios_device_flow *flow;
rtems_termios_device_context *context;
struct rtems_termios_tty *tty;
} rtems_termios_device_node;
/*
* Variables associated with each termios instance.
* One structure for each hardware I/O device.
*/
typedef struct rtems_termios_tty {
/*
* Linked-list of active TERMIOS devices
*/
struct rtems_termios_tty *forw;
struct rtems_termios_tty *back;
/*
* How many times has this device been opened
*/
int refcount;
/*
* This device
*/
rtems_device_major_number major;
rtems_device_minor_number minor;
/*
* Mutual-exclusion semaphores
*/
rtems_mutex isem;
rtems_mutex osem;
/*
* The canonical (cooked) character buffer
*/
char *cbuf;
int ccount;
int cindex;
/*
* Keep track of cursor (printhead) position
*/
int column;
int read_start_column;
/*
* The ioctl settings
*/
struct termios termios;
rtems_interval vtimeTicks;
/*
* Raw input character buffer
*/
struct rtems_termios_rawbuf rawInBuf;
bool rawInBufSemaphoreWait;
rtems_interval rawInBufSemaphoreTimeout;
rtems_interval rawInBufSemaphoreFirstTimeout;
unsigned int rawInBufDropped; /* Statistics */
/*
* Raw output character buffer
*/
struct rtems_termios_rawbuf rawOutBuf;
int t_dqlen; /* count of characters dequeued from device */
enum {rob_idle, rob_busy, rob_wait } rawOutBufState;
/*
* Callbacks to device-specific routines
*/
rtems_termios_callbacks device;
/**
* @brief Context for legacy devices using the callbacks.
*/
rtems_termios_device_context legacy_device_context;
/**
* @brief The device handler.
*/
rtems_termios_device_handler handler;
/**
* @brief The device flow control handler.
*/
rtems_termios_device_flow flow;
volatile unsigned int flow_ctrl;
unsigned int lowwater,highwater;
/*
* I/O task IDs (for task-driven drivers)
*/
rtems_id rxTaskId;
rtems_id txTaskId;
/*
* line discipline related stuff
*/
int t_line; /* id of line discipline */
void *t_sc; /* hook for discipline-specific data structure */
/*
* Wakeup callback variables
*/
struct ttywakeup tty_snd;
struct ttywakeup tty_rcv;
bool tty_rcvwakeup;
/**
* @brief Corresponding device node.
*/
rtems_termios_device_node *device_node;
/**
* @brief Context for device driver.
*/
rtems_termios_device_context *device_context;
} rtems_termios_tty;
/**
* @brief Installs a Termios device.
*
* The installed Termios device may be removed via unlink().
*
* @param[in] device_file The device file path.
* @param[in] handler The device handler. It must be persistent throughout the
* installed time of the device.
* @param[in] flow The device flow control handler. The device flow control
* handler are optional and may be @c NULL. If present must be persistent
* throughout the installed time of the device.
* @param[in] context The device context. It must be persistent throughout the
* installed time of the device.
*
* @retval RTEMS_SUCCESSFUL Successful operation.
* @retval RTEMS_NO_MEMORY Not enough memory to create a device node.
* @retval RTEMS_UNSATISFIED Creation of the device file failed.
* @retval RTEMS_INCORRECT_STATE Termios is not initialized.
*
* @see rtems_termios_get_device_context().
*/
rtems_status_code rtems_termios_device_install(
const char *device_file,
const rtems_termios_device_handler *handler,
const rtems_termios_device_flow *flow,
rtems_termios_device_context *context
);
/**
* @brief Returns the device context of an installed Termios device.
*
* @param[in] tty The Termios control.
*/
RTEMS_INLINE_ROUTINE void *rtems_termios_get_device_context(
const rtems_termios_tty *tty
)
{
return tty->device_context;
}
/**
* @brief Acquires the device lock.
*
* @param[in] context The device context.
* @param[in] lock_context The local interrupt lock context for an acquire and
* release pair.
*/
RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_acquire(
rtems_termios_device_context *context,
rtems_interrupt_lock_context *lock_context
)
{
( *context->lock_acquire )( context, lock_context );
}
/**
* @brief Releases the device lock.
*
* @param[in] context The device context.
* @param[in] lock_context The local interrupt lock context for an acquire and
* release pair.
*/
RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_release(
rtems_termios_device_context *context,
rtems_interrupt_lock_context *lock_context
)
{
( *context->lock_release )( context, lock_context );
}
/**
* @brief Sets the best baud value in the Termios control.
*
* The valid Termios baud values are between 0 and 460800. The Termios baud
* value is chosen which minimizes the difference to the value specified.
*
* @param[in] term The Termios attributes.
* @param[in] baud The current baud setting of the device.
*/
void rtems_termios_set_best_baud(
struct termios *term,
uint32_t baud
);
struct rtems_termios_linesw {
int (*l_open) (struct rtems_termios_tty *tp);
int (*l_close)(struct rtems_termios_tty *tp);
int (*l_read )(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args);
int (*l_write)(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args);
int (*l_rint )(int c,struct rtems_termios_tty *tp);
int (*l_start)(struct rtems_termios_tty *tp);
int (*l_ioctl)(struct rtems_termios_tty *tp,rtems_libio_ioctl_args_t *args);
int (*l_modem)(struct rtems_termios_tty *tp,int flags);
};
/*
* FIXME: this should move to termios.h!
*/
void rtems_termios_rxirq_occured(struct rtems_termios_tty *tty);
/*
* FIXME: this should move to termios.h!
* put a string to output ring buffer
*/
void rtems_termios_puts (
const void *buf,
size_t len,
struct rtems_termios_tty *tty
);
/*
* global hooks for line disciplines
*/
extern struct rtems_termios_linesw rtems_termios_linesw[];
extern int rtems_termios_nlinesw;
#define TTYDISC 0 /* termios tty line discipline */
#define TABLDISC 3 /* tablet discipline */
#define SLIPDISC 4 /* serial IP discipline */
#define PPPDISC 5 /* PPP discipline */
#define MAXLDISC 8
/* baudrate xxx integer type */
typedef uint32_t rtems_termios_baud_t;
/**
* @brief RTEMS Termios Baud Table
*/
extern const rtems_assoc_t rtems_termios_baud_table [];
/**
* @brief Converts the Integral Baud value @a baud to the Termios Control Flag
* Representation
*
* @retval B0 Invalid baud value or a baud value of 0.
* @retval other Baud constant according to @a baud.
*/
speed_t rtems_termios_number_to_baud(rtems_termios_baud_t baud);
/**
* @brief Converts the baud flags to an integral baud value.
*
* @retval 0 Invalid baud value or a baud value of @c B0.
* @retval other Integral baud value.
*/
rtems_termios_baud_t rtems_termios_baud_to_number(speed_t baud);
/**
* @brief Convert Bxxx Constant to Index
*/
int rtems_termios_baud_to_index(rtems_termios_baud_t termios_baud);
/**
* @brief Sets the initial @a baud in the Termios context @a tty.
*
* @retval 0 Successful operation.
* @retval -1 Invalid baud value.
*/
int rtems_termios_set_initial_baud(
struct rtems_termios_tty *tty,
rtems_termios_baud_t baud
);
/**
* @brief Termios kqueue() filter filesystem node handler
*
* Real implementation is provided by libbsd.
*/
int rtems_termios_kqfilter(
rtems_libio_t *iop,
struct knote *kn
);
/**
* @brief Termios mmap() filter filesystem node handler
*
* Real implementation is provided by libbsd.
*/
int rtems_termios_mmap(
rtems_libio_t *iop,
void **addr,
size_t len,
int prot,
off_t off
);
/**
* @brief Termios poll() filesystem node handler.
*
* Real implementation is provided by libbsd.
*/
int rtems_termios_poll(
rtems_libio_t *iop,
int events
);
#define RTEMS_IO_SNDWAKEUP _IOW('t', 11, struct ttywakeup ) /* send tty wakeup */
#define RTEMS_IO_RCVWAKEUP _IOW('t', 12, struct ttywakeup ) /* recv tty wakeup */
#define OLCUC 0x00000100 /* map lower case to upper case on output */
#define IUCLC 0x00004000 /* map upper case to lower case on input */
#define RTEMS_TERMIOS_NUMBER_BAUD_RATES 25
#ifdef __cplusplus
}
#endif
#endif /* TERMIOSTYPES_H */
