1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
new file mode 100644
index 000000000000..60afcdcf91c2
--- /dev/null
+++ b/drivers/s390/char/fs3270.c
@@ -0,0 +1,373 @@
+/*
+ *  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);