/*
* drivers/s390/char/fs3270.c
* IBM/3270 Driver - fullscreen driver.
*
* Author(s):
* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
* Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com>
* -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
*/
#include <linux/config.h>
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/types.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/cpcmd.h>
#include <asm/ebcdic.h>
#include <asm/idals.h>
#include "raw3270.h"
#include "ctrlchar.h"
struct raw3270_fn fs3270_fn;
struct fs3270 {
struct raw3270_view view;
pid_t fs_pid; /* Pid of controlling program. */
int read_command; /* ccw command to use for reads. */
int write_command; /* ccw command to use for writes. */
int attention; /* Got attention. */
struct raw3270_request *clear; /* single clear request. */
wait_queue_head_t attn_wait; /* Attention wait queue. */
};
static void
fs3270_wake_up(struct raw3270_request *rq, void *data)
{
wake_up((wait_queue_head_t *) data);
}
static int
fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
{
wait_queue_head_t wq;
int rc;
init_waitqueue_head(&wq);
rq->callback = fs3270_wake_up;
rq->callback_data = &wq;
rc = raw3270_start(view, rq);
if (rc)
return rc;
/* Started sucessfully. Now wait for completion. */
wait_event(wq, raw3270_request_final(rq));
return rq->rc;
}
static void
fs3270_reset_callback(struct raw3270_request *rq, void *data)
{
raw3270_request_reset(rq);
}
/*
* Switch to the fullscreen view.
*/
static int
fs3270_activate(struct raw3270_view *view)
{
struct fs3270 *fp;
fp = (struct fs3270 *) view;
raw3270_request_set_cmd(fp->clear, TC_EWRITEA);
fp->clear->callback = fs3270_reset_callback;
return raw3270_start(view, fp->clear);
}
/*
* Shutdown fullscreen view.
*/
static void
fs3270_deactivate(struct raw3270_view *view)
{
// FIXME: is this a good idea? The user program using fullscreen 3270
// will die just because a console message appeared. On the other
// hand the fullscreen device is unoperational now.
struct fs3270 *fp;
fp = (struct fs3270 *) view;
if (fp->fs_pid != 0)
kill_proc(fp->fs_pid, SIGHUP, 1);
fp->fs_pid = 0;
}
static int
fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb)
{
/* Handle ATTN. Set indication and wake waiters for attention. */
if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
fp->attention = 1;
wake_up(&fp->attn_wait);
}
if (rq) {
if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
rq->rc = -EIO;
else
/* Normal end. Copy residual count. */
rq->rescnt = irb->scsw.count;
}
return RAW3270_IO_DONE;
}
/*
* Process reads from fullscreen 3270.
*/
static ssize_t
fs3270_read(struct file *filp, char *data, size_t count, loff_t *off)
{
struct fs3270 *fp;
struct raw3270_request *rq;
struct idal_buffer *ib;
int rc;
if (count == 0 || count > 65535)
return -EINVAL;
fp = filp->private_data;
if (!fp)
return -ENODEV;
ib = idal_buffer_alloc(count, 0);
if (!ib)
return -ENOMEM;
rq = raw3270_request_alloc(0);
if (!IS_ERR(rq)) {
if (fp->read_command == 0 && fp->write_command != 0)
fp->read_command = 6;
raw3270_request_set_cmd(rq, fp->read_command ? : 2);
raw3270_request_set_idal(rq, ib);
wait_event(fp->attn_wait, fp->attention);
rc = fs3270_do_io(&fp->view, rq);
if (rc == 0 && idal_buffer_to_user(ib, data, count))
rc = -EFAULT;
raw3270_request_free(rq);
} else
rc = PTR_ERR(rq);
idal_buffer_free(ib);
return rc;
}
/*
* Process writes to fullscreen 3270.
*/
static ssize_t
fs3270_write(struct file *filp, const char *data, size_t count, loff_t *off)
{
struct fs3270 *fp;
struct raw3270_request *rq;
struct idal_buffer *ib;
int write_command;
int rc;
fp = filp->private_data;
if (!fp)
return -ENODEV;
ib = idal_buffer_alloc(count, 0);
if (!ib)
return -ENOMEM;
rq = raw3270_request_alloc(0);
if (!IS_ERR(rq)) {
if (idal_buffer_from_user(ib, data, count) == 0) {
write_command = fp->write_command ? : 1;
if (write_command == 5)
write_command = 13;
raw3270_request_set_cmd(rq, write_command);
raw3270_request_set_idal(rq, ib);
rc = fs3270_do_io(&fp->view, rq);
} else
rc = -EFAULT;
raw3270_request_free(rq);
} else
rc = PTR_ERR(rq);
idal_buffer_free(ib);
return rc;
}
/*
* process ioctl commands for the tube driver
*/
static int
fs3270_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct fs3270 *fp;
struct raw3270_iocb iocb;
int rc;
fp = filp->private_data;
if (!fp)
return -ENODEV;
rc = 0;
switch (cmd) {
case TUBICMD:
fp->read_command = arg;
break;
case TUBOCMD:
fp->write_command = arg;
break;
case TUBGETI:
rc = put_user(fp->read_command, (char *) arg);
break;
case TUBGETO:
rc = put_user(fp->write_command,(char *) arg);
break;
case TUBGETMOD:
iocb.model = fp->view.model;
iocb.line_cnt = fp->view.rows;
iocb.col_cnt = fp->view.cols;
iocb.pf_cnt = 24;
iocb.re_cnt = 20;
iocb.map = 0;
if (copy_to_user((char *) arg, &iocb,
sizeof(struct raw3270_iocb)))
rc = -EFAULT;
break;
}
return rc;
}
/*
* Allocate tty3270 structure.
*/
static struct fs3270 *
fs3270_alloc_view(void)
{
struct fs3270 *fp;
fp = (struct fs3270 *) kmalloc(sizeof(struct fs3270),GFP_KERNEL);
if (!fp)
return ERR_PTR(-ENOMEM);
memset(fp, 0, sizeof(struct fs3270));
fp->clear = raw3270_request_alloc(0);
if (!IS_ERR(fp->clear)) {
kfree(fp);
return ERR_PTR(-ENOMEM);
}
return fp;
}
/*
* Free tty3270 structure.
*/
static void
fs3270_free_view(struct raw3270_view *view)
{
raw3270_request_free(((struct fs3270 *) view)->clear);
kfree(view);
}
/*
* Unlink fs3270 data structure from filp.
*/
static void
fs3270_release(struct raw3270_view *view)
{
}
/* View to a 3270 device. Can be console, tty or fullscreen. */
struct raw3270_fn fs3270_fn = {
.activate = fs3270_activate,
.deactivate = fs3270_deactivate,
.intv = (void *) fs3270_irq,
.release = fs3270_release,
.free = fs3270_free_view
};
/*
* This routine is called whenever a 3270 fullscreen device is opened.
*/
static int
fs3270_open(struct inode *inode, struct file *filp)
{
struct fs3270 *fp;
int minor, rc;
if (imajor(filp->f_dentry->d_inode) != IBM_FS3270_MAJOR)
return -ENODEV;
minor = iminor(filp->f_dentry->d_inode);
/* Check if some other program is already using fullscreen mode. */
fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
if (!IS_ERR(fp)) {
raw3270_put_view(&fp->view);
return -EBUSY;
}
/* Allocate fullscreen view structure. */
fp = fs3270_alloc_view();
if (IS_ERR(fp))
return PTR_ERR(fp);
init_waitqueue_head(&fp->attn_wait);
fp->fs_pid = current->pid;
rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
if (rc) {
fs3270_free_view(&fp->view);
return rc;
}
rc = raw3270_activate_view(&fp->view);
if (rc) {
raw3270_del_view(&fp->view);
return rc;
}
filp->private_data = fp;
return 0;
}
/*
* This routine is called when the 3270 tty is closed. We wait
* for the remaining request to be completed. Then we clean up.
*/
static int
fs3270_close(struct inode *inode, struct file *filp)
{
struct fs3270 *fp;
fp = filp->private_data;
filp->private_data = 0;
if (fp)
raw3270_del_view(&fp->view);
return 0;
}
static struct file_operations fs3270_fops = {
.owner = THIS_MODULE, /* owner */
.read = fs3270_read, /* read */
.write = fs3270_write, /* write */
.ioctl = fs3270_ioctl, /* ioctl */
.open = fs3270_open, /* open */
.release = fs3270_close, /* release */
};
/*
* 3270 fullscreen driver initialization.
*/
static int __init
fs3270_init(void)
{
int rc;
rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops);
if (rc) {
printk(KERN_ERR "fs3270 can't get major number %d: errno %d\n",
IBM_FS3270_MAJOR, rc);
return rc;
}
return 0;
}
static void __exit
fs3270_exit(void)
{
unregister_chrdev(IBM_FS3270_MAJOR, "fs3270");
}
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR);
module_init(fs3270_init);
module_exit(fs3270_exit);
