sbus_tty.c

/*
 
IOP->EE TTY over SBUS by Herben
 
This file contains the file system driver and glue needed to create a TTY file file system and redirect it to EE over SBUS.
 
Additionally it installs a Kprintf handler so you can even see the things you don't normally see like the error messages WaitSema gives
for those naughty ps2ip modules. ;)
 
Of course this requires that the EE-side code accept this command and output the string to screen/sio...
 
*/
 
#include <tamtypes.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <sysclib.h>
#include <sysmem.h>
#include <excepman.h>
#include <intrman.h>
#include <ioman.h>
#include <ps2_debug.h>
#include <ps2_sbus.h>
 
#include "iopdebug.h"
 
extern void sbus_tty_puts(const char *str);
 
static int ttyfs_init()
{
    //DBG_puts("SIOTTY: FS Init()\n");
    return 0;
}
 
static int ttyfs_deinit()
{
    //DBG_puts("SIOTTY: FS Deinit()\n");
    return 0;
}
 
static int ttyfs_open(iop_file_t *file, const char *name, int flags)
{
    (void)file;
    (void)name;
    (void)flags;
 
    //DBG_puts("SIOTTY: FS Open()\n");
    return 0;
}
 
static int ttyfs_dopen(iop_file_t *file, const char *name)
{
    (void)file;
    (void)name;
 
    //DBG_puts("SIOTTY: FS Dopen()\n");
    return 0;
}
 
static int ttyfs_close(iop_file_t *file)
{
    (void)file;
 
    //DBG_puts("SIOTTY: FS Close()\n");
    return(0);
}
 
static int ttyfs_write(iop_file_t *file, void *ptr, int size) {
    char temp[65];
    int bCount = 0;
 
    (void)file;
 
    //DBG_puts("SIOTTY: FS Write()\n");
 
    while(bCount < size)
    {
        int toWrite;
 
        toWrite = (size - bCount);
        if(toWrite > 64)
            toWrite = 64;
 
        memcpy(temp, &(((u8 *)ptr)[bCount]), toWrite);
        temp[toWrite] = '\0';
        sbus_tty_puts(temp);
 
        bCount += toWrite;
    }
 
    return(bCount);
}
 
IOMAN_RETURN_VALUE_IMPL(EPERM);
 
static iop_device_ops_t fsd_ops =
{
    &ttyfs_init, // init
    &ttyfs_deinit, // deinit
    IOMAN_RETURN_VALUE(EPERM), // format
    &ttyfs_open, // open
    &ttyfs_close, // close
    IOMAN_RETURN_VALUE(EPERM), // read
    &ttyfs_write, // write
    IOMAN_RETURN_VALUE(EPERM), // lseek
    IOMAN_RETURN_VALUE(EPERM), // ioctl
    IOMAN_RETURN_VALUE(EPERM), // remove
    IOMAN_RETURN_VALUE(EPERM), // mkdir
    IOMAN_RETURN_VALUE(EPERM), // rmdir
    &ttyfs_dopen, // dopen
    &ttyfs_close, // dclose
    IOMAN_RETURN_VALUE(EPERM), // dread
    IOMAN_RETURN_VALUE(EPERM), // getstat
    IOMAN_RETURN_VALUE(EPERM), // chstat
};
 
static iop_device_t tty_fsd =
{
    "tty",
    IOP_DT_FS,
    1,
    "TTY via EE SIO",
    &fsd_ops,
};
 
void sprintf_putchar(void *context, int c)
{
    char **string = (char **)context;
 
    if(c < 0x100) { ((*string)++)[0] = c; }
    else { (*string)[0] = 0; }
}
 
extern int _vsprintf(char * str, const char * format, va_list ap);
 
static char kprint_buffer[1024];
 
int _kPrintf(void *context, const char * format, va_list ap)
{
    (void)context;
 
    int r = prnt(&sprintf_putchar, &format, format, ap);
    sbus_tty_puts(kprint_buffer);
    return r;
}
 
int sbus_tty_init(void)
{
    close(0);
    close(1);
    DelDrv(tty_fsd.name);
    DelDrv("dummytty");
 
    if(AddDrv(&tty_fsd) != 0) { return(-1); }
 
    open("tty:", O_RDONLY);
    open("tty:", O_WRONLY);
 
    KprintfSet(&_kPrintf, NULL);
 
    return(0);
}