Viewing file:  hwc_tty.c (6.47 KB) -rw-r--r--
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/*
* drivers/s390/char/hwc_tty.c
* HWC line mode terminal driver.
*
* S390 version
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Peschke <mpeschke@de.ibm.com>
*
* Thanks to Martin Schwidefsky.
*/
#include <linux/config.h>
#include <linux/major.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include "hwc_rw.h"
#include "ctrlchar.h"
#define HWC_TTY_PRINT_HEADER "hwc tty driver: "
#define HWC_TTY_BUF_SIZE 512
typedef struct {
struct tty_struct *tty;
unsigned char buf[HWC_TTY_BUF_SIZE];
unsigned short int buf_count;
spinlock_t lock;
hwc_high_level_calls_t calls;
} hwc_tty_data_struct;
static hwc_tty_data_struct hwc_tty_data =
{ /* NULL/0 */ };
static struct tty_driver hwc_tty_driver;
static struct tty_struct *hwc_tty_table[1];
static struct termios *hwc_tty_termios[1];
static struct termios *hwc_tty_termios_locked[1];
static int hwc_tty_refcount = 0;
extern struct termios tty_std_termios;
void hwc_tty_wake_up (void);
void hwc_tty_input (unsigned char *, unsigned int);
static int
hwc_tty_open (struct tty_struct *tty,
struct file *filp)
{
if (MINOR (tty->device) - tty->driver.minor_start)
return -ENODEV;
tty->driver_data = &hwc_tty_data;
hwc_tty_data.buf_count = 0;
hwc_tty_data.tty = tty;
tty->low_latency = 0;
hwc_tty_data.calls.wake_up = hwc_tty_wake_up;
hwc_tty_data.calls.move_input = hwc_tty_input;
hwc_register_calls (&(hwc_tty_data.calls));
return 0;
}
static void
hwc_tty_close (struct tty_struct *tty,
struct file *filp)
{
if (MINOR (tty->device) != tty->driver.minor_start) {
printk (KERN_WARNING HWC_TTY_PRINT_HEADER
"do not close hwc tty because of wrong device number");
return;
}
if (tty->count > 1)
return;
hwc_tty_data.tty = NULL;
hwc_unregister_calls (&(hwc_tty_data.calls));
}
static int
hwc_tty_write_room (struct tty_struct *tty)
{
int retval;
retval = hwc_write_room (IN_BUFS_TOTAL);
return retval;
}
static int
hwc_tty_write (struct tty_struct *tty,
int from_user,
const unsigned char *buf,
int count)
{
int retval;
if (hwc_tty_data.buf_count > 0) {
hwc_write (0, hwc_tty_data.buf, hwc_tty_data.buf_count);
hwc_tty_data.buf_count = 0;
}
retval = hwc_write (from_user, buf, count);
return retval;
}
static void
hwc_tty_put_char (struct tty_struct *tty,
unsigned char ch)
{
unsigned long flags;
spin_lock_irqsave (&hwc_tty_data.lock, flags);
if (hwc_tty_data.buf_count >= HWC_TTY_BUF_SIZE) {
hwc_write (0, hwc_tty_data.buf, hwc_tty_data.buf_count);
hwc_tty_data.buf_count = 0;
}
hwc_tty_data.buf[hwc_tty_data.buf_count] = ch;
hwc_tty_data.buf_count++;
spin_unlock_irqrestore (&hwc_tty_data.lock, flags);
}
static void
hwc_tty_flush_chars (struct tty_struct *tty)
{
unsigned long flags;
spin_lock_irqsave (&hwc_tty_data.lock, flags);
hwc_write (0, hwc_tty_data.buf, hwc_tty_data.buf_count);
hwc_tty_data.buf_count = 0;
spin_unlock_irqrestore (&hwc_tty_data.lock, flags);
}
static int
hwc_tty_chars_in_buffer (struct tty_struct *tty)
{
int retval;
retval = hwc_chars_in_buffer (IN_BUFS_TOTAL);
return retval;
}
static void
hwc_tty_flush_buffer (struct tty_struct *tty)
{
hwc_tty_wake_up ();
}
static int
hwc_tty_ioctl (
struct tty_struct *tty,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
return hwc_ioctl (cmd, arg);
}
void
hwc_tty_wake_up (void)
{
if (hwc_tty_data.tty == NULL)
return;
if ((hwc_tty_data.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
hwc_tty_data.tty->ldisc.write_wakeup)
(hwc_tty_data.tty->ldisc.write_wakeup) (hwc_tty_data.tty);
wake_up_interruptible (&hwc_tty_data.tty->write_wait);
}
void
hwc_tty_input (unsigned char *buf, unsigned int count)
{
struct tty_struct *tty = hwc_tty_data.tty;
if (tty != NULL) {
char *cchar;
if ((cchar = ctrlchar_handle (buf, count, tty))) {
if (cchar == (char *) -1)
return;
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_NORMAL;
*tty->flip.char_buf_ptr++ = *cchar;
} else {
memcpy (tty->flip.char_buf_ptr, buf, count);
if (count < 2 || (
strncmp (buf + count - 2, "^n", 2) ||
strncmp (buf + count - 2, "\0252n", 2))) {
tty->flip.char_buf_ptr[count] = '\n';
count++;
} else
count -= 2;
memset (tty->flip.flag_buf_ptr, TTY_NORMAL, count);
tty->flip.char_buf_ptr += count;
tty->flip.flag_buf_ptr += count;
tty->flip.count += count;
}
tty_flip_buffer_push (tty);
hwc_tty_wake_up ();
}
}
void
hwc_tty_init (void)
{
if (!CONSOLE_IS_HWC)
return;
ctrlchar_init ();
memset (&hwc_tty_driver, 0, sizeof (struct tty_driver));
memset (&hwc_tty_data, 0, sizeof (hwc_tty_data_struct));
hwc_tty_driver.magic = TTY_DRIVER_MAGIC;
hwc_tty_driver.driver_name = "tty_hwc";
hwc_tty_driver.name = "ttyS";
hwc_tty_driver.name_base = 0;
hwc_tty_driver.major = TTY_MAJOR;
hwc_tty_driver.minor_start = 64;
hwc_tty_driver.num = 1;
hwc_tty_driver.type = TTY_DRIVER_TYPE_SYSTEM;
hwc_tty_driver.subtype = SYSTEM_TYPE_TTY;
hwc_tty_driver.init_termios = tty_std_termios;
hwc_tty_driver.init_termios.c_iflag = IGNBRK | IGNPAR;
hwc_tty_driver.init_termios.c_oflag = ONLCR;
hwc_tty_driver.init_termios.c_lflag = ISIG | ECHO;
hwc_tty_driver.flags = TTY_DRIVER_REAL_RAW;
hwc_tty_driver.refcount = &hwc_tty_refcount;
hwc_tty_driver.table = hwc_tty_table;
hwc_tty_driver.termios = hwc_tty_termios;
hwc_tty_driver.termios_locked = hwc_tty_termios_locked;
hwc_tty_driver.open = hwc_tty_open;
hwc_tty_driver.close = hwc_tty_close;
hwc_tty_driver.write = hwc_tty_write;
hwc_tty_driver.put_char = hwc_tty_put_char;
hwc_tty_driver.flush_chars = hwc_tty_flush_chars;
hwc_tty_driver.write_room = hwc_tty_write_room;
hwc_tty_driver.chars_in_buffer = hwc_tty_chars_in_buffer;
hwc_tty_driver.flush_buffer = hwc_tty_flush_buffer;
hwc_tty_driver.ioctl = hwc_tty_ioctl;
hwc_tty_driver.throttle = NULL;
hwc_tty_driver.unthrottle = NULL;
hwc_tty_driver.send_xchar = NULL;
hwc_tty_driver.set_termios = NULL;
hwc_tty_driver.set_ldisc = NULL;
hwc_tty_driver.stop = NULL;
hwc_tty_driver.start = NULL;
hwc_tty_driver.hangup = NULL;
hwc_tty_driver.break_ctl = NULL;
hwc_tty_driver.wait_until_sent = NULL;
hwc_tty_driver.read_proc = NULL;
hwc_tty_driver.write_proc = NULL;
if (tty_register_driver (&hwc_tty_driver))
panic ("Couldn't register hwc_tty driver\n");
}
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