1 files changed, 0 insertions, 1963 deletions

diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
deleted file mode 100644
index 26e3995ac062..000000000000
--- a/drivers/s390/char/tty3270.c
+++ /dev/null
@@ -1,1963 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *    IBM/3270 Driver - tty functions.
- *
- *  Author(s):
- *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
- *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
- *	-- Copyright IBM Corp. 2003
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kdev_t.h>
-#include <linux/tty.h>
-#include <linux/vt_kern.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-
-#include <linux/slab.h>
-#include <linux/memblock.h>
-#include <linux/compat.h>
-
-#include <asm/ccwdev.h>
-#include <asm/cio.h>
-#include <asm/ebcdic.h>
-#include <linux/uaccess.h>
-
-#include "raw3270.h"
-#include "tty3270.h"
-#include "keyboard.h"
-
-#define TTY3270_CHAR_BUF_SIZE 256
-#define TTY3270_OUTPUT_BUFFER_SIZE 1024
-#define TTY3270_STRING_PAGES 5
-
-struct tty_driver *tty3270_driver;
-static int tty3270_max_index;
-
-static struct raw3270_fn tty3270_fn;
-
-struct tty3270_cell {
-	unsigned char character;
-	unsigned char highlight;
-	unsigned char f_color;
-};
-
-struct tty3270_line {
-	struct tty3270_cell *cells;
-	int len;
-};
-
-#define ESCAPE_NPAR 8
-
-/*
- * The main tty view data structure.
- * FIXME:
- * 1) describe line orientation & lines list concept against screen
- * 2) describe conversion of screen to lines
- * 3) describe line format.
- */
-struct tty3270 {
-	struct raw3270_view view;
-	struct tty_port port;
-	void **freemem_pages;		/* Array of pages used for freemem. */
-	struct list_head freemem;	/* List of free memory for strings. */
-
-	/* Output stuff. */
-	struct list_head lines;		/* List of lines. */
-	struct list_head update;	/* List of lines to update. */
-	unsigned char wcc;		/* Write control character. */
-	int nr_lines;			/* # lines in list. */
-	int nr_up;			/* # lines up in history. */
-	unsigned long update_flags;	/* Update indication bits. */
-	struct string *status;		/* Lower right of display. */
-	struct raw3270_request *write;	/* Single write request. */
-	struct timer_list timer;	/* Output delay timer. */
-
-	/* Current tty screen. */
-	unsigned int cx, cy;		/* Current output position. */
-	unsigned int highlight;		/* Blink/reverse/underscore */
-	unsigned int f_color;		/* Foreground color */
-	struct tty3270_line *screen;
-	unsigned int n_model, n_cols, n_rows;	/* New model & size */
-	struct work_struct resize_work;
-
-	/* Input stuff. */
-	struct string *prompt;		/* Output string for input area. */
-	struct string *input;		/* Input string for read request. */
-	struct raw3270_request *read;	/* Single read request. */
-	struct raw3270_request *kreset;	/* Single keyboard reset request. */
-	unsigned char inattr;		/* Visible/invisible input. */
-	int throttle, attn;		/* tty throttle/unthrottle. */
-	struct tasklet_struct readlet;	/* Tasklet to issue read request. */
-	struct tasklet_struct hanglet;	/* Tasklet to hang up the tty. */
-	struct kbd_data *kbd;		/* key_maps stuff. */
-
-	/* Escape sequence parsing. */
-	int esc_state, esc_ques, esc_npar;
-	int esc_par[ESCAPE_NPAR];
-	unsigned int saved_cx, saved_cy;
-	unsigned int saved_highlight, saved_f_color;
-
-	/* Command recalling. */
-	struct list_head rcl_lines;	/* List of recallable lines. */
-	struct list_head *rcl_walk;	/* Point in rcl_lines list. */
-	int rcl_nr, rcl_max;		/* Number/max number of rcl_lines. */
-
-	/* Character array for put_char/flush_chars. */
-	unsigned int char_count;
-	char char_buf[TTY3270_CHAR_BUF_SIZE];
-};
-
-/* tty3270->update_flags. See tty3270_update for details. */
-#define TTY_UPDATE_ERASE	1	/* Use EWRITEA instead of WRITE. */
-#define TTY_UPDATE_LIST		2	/* Update lines in tty3270->update. */
-#define TTY_UPDATE_INPUT	4	/* Update input line. */
-#define TTY_UPDATE_STATUS	8	/* Update status line. */
-#define TTY_UPDATE_ALL		16	/* Recreate screen. */
-
-static void tty3270_update(struct timer_list *);
-static void tty3270_resize_work(struct work_struct *work);
-
-/*
- * Setup timeout for a device. On timeout trigger an update.
- */
-static void tty3270_set_timer(struct tty3270 *tp, int expires)
-{
-	mod_timer(&tp->timer, jiffies + expires);
-}
-
-/*
- * The input line are the two last lines of the screen.
- */
-static void
-tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
-{
-	struct string *line;
-	unsigned int off;
-
-	line = tp->prompt;
-	if (count != 0)
-		line->string[5] = TF_INMDT;
-	else
-		line->string[5] = tp->inattr;
-	if (count > tp->view.cols * 2 - 11)
-		count = tp->view.cols * 2 - 11;
-	memcpy(line->string + 6, input, count);
-	line->string[6 + count] = TO_IC;
-	/* Clear to end of input line. */
-	if (count < tp->view.cols * 2 - 11) {
-		line->string[7 + count] = TO_RA;
-		line->string[10 + count] = 0;
-		off = tp->view.cols * tp->view.rows - 9;
-		raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
-		line->len = 11 + count;
-	} else
-		line->len = 7 + count;
-	tp->update_flags |= TTY_UPDATE_INPUT;
-}
-
-static void
-tty3270_create_prompt(struct tty3270 *tp)
-{
-	static const unsigned char blueprint[] =
-		{ TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
-		  /* empty input string */
-		  TO_IC, TO_RA, 0, 0, 0 };
-	struct string *line;
-	unsigned int offset;
-
-	line = alloc_string(&tp->freemem,
-			    sizeof(blueprint) + tp->view.cols * 2 - 9);
-	tp->prompt = line;
-	tp->inattr = TF_INPUT;
-	/* Copy blueprint to status line */
-	memcpy(line->string, blueprint, sizeof(blueprint));
-	line->len = sizeof(blueprint);
-	/* Set output offsets. */
-	offset = tp->view.cols * (tp->view.rows - 2);
-	raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
-	offset = tp->view.cols * tp->view.rows - 9;
-	raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
-
-	/* Allocate input string for reading. */
-	tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
-}
-
-/*
- * The status line is the last line of the screen. It shows the string
- * "Running"/"Holding" in the lower right corner of the screen.
- */
-static void
-tty3270_update_status(struct tty3270 * tp)
-{
-	char *str;
-
-	str = (tp->nr_up != 0) ? "History" : "Running";
-	memcpy(tp->status->string + 8, str, 7);
-	codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
-	tp->update_flags |= TTY_UPDATE_STATUS;
-}
-
-static void
-tty3270_create_status(struct tty3270 * tp)
-{
-	static const unsigned char blueprint[] =
-		{ TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
-		  0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
-		  TAC_RESET };
-	struct string *line;
-	unsigned int offset;
-
-	line = alloc_string(&tp->freemem,sizeof(blueprint));
-	tp->status = line;
-	/* Copy blueprint to status line */
-	memcpy(line->string, blueprint, sizeof(blueprint));
-	/* Set address to start of status string (= last 9 characters). */
-	offset = tp->view.cols * tp->view.rows - 9;
-	raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
-}
-
-/*
- * Set output offsets to 3270 datastream fragment of a tty string.
- * (TO_SBA offset at the start and TO_RA offset at the end of the string)
- */
-static void
-tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
-{
-	unsigned char *cp;
-
-	raw3270_buffer_address(tp->view.dev, line->string + 1,
-			       tp->view.cols * nr);
-	cp = line->string + line->len - 4;
-	if (*cp == TO_RA)
-		raw3270_buffer_address(tp->view.dev, cp + 1,
-				       tp->view.cols * (nr + 1));
-}
-
-/*
- * Rebuild update list to print all lines.
- */
-static void
-tty3270_rebuild_update(struct tty3270 *tp)
-{
-	struct string *s, *n;
-	int line, nr_up;
-
-	/* 
-	 * Throw away update list and create a new one,
-	 * containing all lines that will fit on the screen.
-	 */
-	list_for_each_entry_safe(s, n, &tp->update, update)
-		list_del_init(&s->update);
-	line = tp->view.rows - 3;
-	nr_up = tp->nr_up;
-	list_for_each_entry_reverse(s, &tp->lines, list) {
-		if (nr_up > 0) {
-			nr_up--;
-			continue;
-		}
-		tty3270_update_string(tp, s, line);
-		list_add(&s->update, &tp->update);
-		if (--line < 0)
-			break;
-	}
-	tp->update_flags |= TTY_UPDATE_LIST;
-}
-
-/*
- * Alloc string for size bytes. If there is not enough room in
- * freemem, free strings until there is room.
- */
-static struct string *
-tty3270_alloc_string(struct tty3270 *tp, size_t size)
-{
-	struct string *s, *n;
-
-	s = alloc_string(&tp->freemem, size);
-	if (s)
-		return s;
-	list_for_each_entry_safe(s, n, &tp->lines, list) {
-		BUG_ON(tp->nr_lines <= tp->view.rows - 2);
-		list_del(&s->list);
-		if (!list_empty(&s->update))
-			list_del(&s->update);
-		tp->nr_lines--;
-		if (free_string(&tp->freemem, s) >= size)
-			break;
-	}
-	s = alloc_string(&tp->freemem, size);
-	BUG_ON(!s);
-	if (tp->nr_up != 0 &&
-	    tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
-		tp->nr_up = tp->nr_lines - tp->view.rows + 2;
-		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
-	}
-	return s;
-}
-
-/*
- * Add an empty line to the list.
- */
-static void
-tty3270_blank_line(struct tty3270 *tp)
-{
-	static const unsigned char blueprint[] =
-		{ TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
-		  TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
-	struct string *s;
-
-	s = tty3270_alloc_string(tp, sizeof(blueprint));
-	memcpy(s->string, blueprint, sizeof(blueprint));
-	s->len = sizeof(blueprint);
-	list_add_tail(&s->list, &tp->lines);
-	tp->nr_lines++;
-	if (tp->nr_up != 0)
-		tp->nr_up++;
-}
-
-/*
- * Create a blank screen and remove all lines from the history.
- */
-static void
-tty3270_blank_screen(struct tty3270 *tp)
-{
-	struct string *s, *n;
-	int i;
-
-	for (i = 0; i < tp->view.rows - 2; i++)
-		tp->screen[i].len = 0;
-	tp->nr_up = 0;
-	list_for_each_entry_safe(s, n, &tp->lines, list) {
-		list_del(&s->list);
-		if (!list_empty(&s->update))
-			list_del(&s->update);
-		tp->nr_lines--;
-		free_string(&tp->freemem, s);
-	}
-}
-
-/*
- * Write request completion callback.
- */
-static void
-tty3270_write_callback(struct raw3270_request *rq, void *data)
-{
-	struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
-
-	if (rq->rc != 0) {
-		/* Write wasn't successful. Refresh all. */
-		tp->update_flags = TTY_UPDATE_ALL;
-		tty3270_set_timer(tp, 1);
-	}
-	raw3270_request_reset(rq);
-	xchg(&tp->write, rq);
-}
-
-/*
- * Update 3270 display.
- */
-static void
-tty3270_update(struct timer_list *t)
-{
-	struct tty3270 *tp = from_timer(tp, t, timer);
-	static char invalid_sba[2] = { 0xff, 0xff };
-	struct raw3270_request *wrq;
-	unsigned long updated;
-	struct string *s, *n;
-	char *sba, *str;
-	int rc, len;
-
-	wrq = xchg(&tp->write, 0);
-	if (!wrq) {
-		tty3270_set_timer(tp, 1);
-		return;
-	}
-
-	spin_lock(&tp->view.lock);
-	updated = 0;
-	if (tp->update_flags & TTY_UPDATE_ALL) {
-		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
-		tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
-			TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
-	}
-	if (tp->update_flags & TTY_UPDATE_ERASE) {
-		/* Use erase write alternate to erase display. */
-		raw3270_request_set_cmd(wrq, TC_EWRITEA);
-		updated |= TTY_UPDATE_ERASE;
-	} else
-		raw3270_request_set_cmd(wrq, TC_WRITE);
-
-	raw3270_request_add_data(wrq, &tp->wcc, 1);
-	tp->wcc = TW_NONE;
-
-	/*
-	 * Update status line.
-	 */
-	if (tp->update_flags & TTY_UPDATE_STATUS)
-		if (raw3270_request_add_data(wrq, tp->status->string,
-					     tp->status->len) == 0)
-			updated |= TTY_UPDATE_STATUS;
-
-	/*
-	 * Write input line.
-	 */
-	if (tp->update_flags & TTY_UPDATE_INPUT)
-		if (raw3270_request_add_data(wrq, tp->prompt->string,
-					     tp->prompt->len) == 0)
-			updated |= TTY_UPDATE_INPUT;
-
-	sba = invalid_sba;
-	
-	if (tp->update_flags & TTY_UPDATE_LIST) {
-		/* Write strings in the update list to the screen. */
-		list_for_each_entry_safe(s, n, &tp->update, update) {
-			str = s->string;
-			len = s->len;
-			/*
-			 * Skip TO_SBA at the start of the string if the
-			 * last output position matches the start address
-			 * of this line.
-			 */
-			if (s->string[1] == sba[0] && s->string[2] == sba[1]) {
-				str += 3;
-				len -= 3;
-			}
-			if (raw3270_request_add_data(wrq, str, len) != 0)
-				break;
-			list_del_init(&s->update);
-			if (s->string[s->len - 4] == TO_RA)
-				sba = s->string + s->len - 3;
-			else
-				sba = invalid_sba;
-		}
-		if (list_empty(&tp->update))
-			updated |= TTY_UPDATE_LIST;
-	}
-	wrq->callback = tty3270_write_callback;
-	rc = raw3270_start(&tp->view, wrq);
-	if (rc == 0) {
-		tp->update_flags &= ~updated;
-		if (tp->update_flags)
-			tty3270_set_timer(tp, 1);
-	} else {
-		raw3270_request_reset(wrq);
-		xchg(&tp->write, wrq);
-	}
-	spin_unlock(&tp->view.lock);
-}
-
-/*
- * Command recalling.
- */
-static void
-tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
-{
-	struct string *s;
-
-	tp->rcl_walk = NULL;
-	if (len <= 0)
-		return;
-	if (tp->rcl_nr >= tp->rcl_max) {
-		s = list_entry(tp->rcl_lines.next, struct string, list);
-		list_del(&s->list);
-		free_string(&tp->freemem, s);
-		tp->rcl_nr--;
-	}
-	s = tty3270_alloc_string(tp, len);
-	memcpy(s->string, input, len);
-	list_add_tail(&s->list, &tp->rcl_lines);
-	tp->rcl_nr++;
-}
-
-static void
-tty3270_rcl_backward(struct kbd_data *kbd)
-{
-	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
-	struct string *s;
-
-	spin_lock_bh(&tp->view.lock);
-	if (tp->inattr == TF_INPUT) {
-		if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
-			tp->rcl_walk = tp->rcl_walk->prev;
-		else if (!list_empty(&tp->rcl_lines))
-			tp->rcl_walk = tp->rcl_lines.prev;
-		s = tp->rcl_walk ? 
-			list_entry(tp->rcl_walk, struct string, list) : NULL;
-		if (tp->rcl_walk) {
-			s = list_entry(tp->rcl_walk, struct string, list);
-			tty3270_update_prompt(tp, s->string, s->len);
-		} else
-			tty3270_update_prompt(tp, NULL, 0);
-		tty3270_set_timer(tp, 1);
-	}
-	spin_unlock_bh(&tp->view.lock);
-}
-
-/*
- * Deactivate tty view.
- */
-static void
-tty3270_exit_tty(struct kbd_data *kbd)
-{
-	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
-
-	raw3270_deactivate_view(&tp->view);
-}
-
-/*
- * Scroll forward in history.
- */
-static void
-tty3270_scroll_forward(struct kbd_data *kbd)
-{
-	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
-	int nr_up;
-
-	spin_lock_bh(&tp->view.lock);
-	nr_up = tp->nr_up - tp->view.rows + 2;
-	if (nr_up < 0)
-		nr_up = 0;
-	if (nr_up != tp->nr_up) {
-		tp->nr_up = nr_up;
-		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
-		tty3270_set_timer(tp, 1);
-	}
-	spin_unlock_bh(&tp->view.lock);
-}
-
-/*
- * Scroll backward in history.
- */
-static void
-tty3270_scroll_backward(struct kbd_data *kbd)
-{
-	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
-	int nr_up;
-
-	spin_lock_bh(&tp->view.lock);
-	nr_up = tp->nr_up + tp->view.rows - 2;
-	if (nr_up + tp->view.rows - 2 > tp->nr_lines)
-		nr_up = tp->nr_lines - tp->view.rows + 2;
-	if (nr_up != tp->nr_up) {
-		tp->nr_up = nr_up;
-		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
-		tty3270_set_timer(tp, 1);
-	}
-	spin_unlock_bh(&tp->view.lock);
-}
-
-/*
- * Pass input line to tty.
- */
-static void
-tty3270_read_tasklet(unsigned long data)
-{
-	struct raw3270_request *rrq = (struct raw3270_request *)data;
-	static char kreset_data = TW_KR;
-	struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
-	char *input;
-	int len;
-
-	spin_lock_bh(&tp->view.lock);
-	/*
-	 * Two AID keys are special: For 0x7d (enter) the input line
-	 * has to be emitted to the tty and for 0x6d the screen
-	 * needs to be redrawn.
-	 */
-	input = NULL;
-	len = 0;
-	if (tp->input->string[0] == 0x7d) {
-		/* Enter: write input to tty. */
-		input = tp->input->string + 6;
-		len = tp->input->len - 6 - rrq->rescnt;
-		if (tp->inattr != TF_INPUTN)
-			tty3270_rcl_add(tp, input, len);
-		if (tp->nr_up > 0) {
-			tp->nr_up = 0;
-			tty3270_rebuild_update(tp);
-			tty3270_update_status(tp);
-		}
-		/* Clear input area. */
-		tty3270_update_prompt(tp, NULL, 0);
-		tty3270_set_timer(tp, 1);
-	} else if (tp->input->string[0] == 0x6d) {
-		/* Display has been cleared. Redraw. */
-		tp->update_flags = TTY_UPDATE_ALL;
-		tty3270_set_timer(tp, 1);
-	}
-	spin_unlock_bh(&tp->view.lock);
-
-	/* Start keyboard reset command. */
-	raw3270_request_reset(tp->kreset);
-	raw3270_request_set_cmd(tp->kreset, TC_WRITE);
-	raw3270_request_add_data(tp->kreset, &kreset_data, 1);
-	raw3270_start(&tp->view, tp->kreset);
-
-	while (len-- > 0)
-		kbd_keycode(tp->kbd, *input++);
-	/* Emit keycode for AID byte. */
-	kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
-
-	raw3270_request_reset(rrq);
-	xchg(&tp->read, rrq);
-	raw3270_put_view(&tp->view);
-}
-
-/*
- * Read request completion callback.
- */
-static void
-tty3270_read_callback(struct raw3270_request *rq, void *data)
-{
-	struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
-	raw3270_get_view(rq->view);
-	/* Schedule tasklet to pass input to tty. */
-	tasklet_schedule(&tp->readlet);
-}
-
-/*
- * Issue a read request. Call with device lock.
- */
-static void
-tty3270_issue_read(struct tty3270 *tp, int lock)
-{
-	struct raw3270_request *rrq;
-	int rc;
-
-	rrq = xchg(&tp->read, 0);
-	if (!rrq)
-		/* Read already scheduled. */
-		return;
-	rrq->callback = tty3270_read_callback;
-	rrq->callback_data = tp;
-	raw3270_request_set_cmd(rrq, TC_READMOD);
-	raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
-	/* Issue the read modified request. */
-	if (lock) {
-		rc = raw3270_start(&tp->view, rrq);
-	} else
-		rc = raw3270_start_irq(&tp->view, rrq);
-	if (rc) {
-		raw3270_request_reset(rrq);
-		xchg(&tp->read, rrq);
-	}
-}
-
-/*
- * Hang up the tty
- */
-static void
-tty3270_hangup_tasklet(unsigned long data)
-{
-	struct tty3270 *tp = (struct tty3270 *)data;
-	tty_port_tty_hangup(&tp->port, true);
-	raw3270_put_view(&tp->view);
-}
-
-/*
- * Switch to the tty view.
- */
-static int
-tty3270_activate(struct raw3270_view *view)
-{
-	struct tty3270 *tp = container_of(view, struct tty3270, view);
-
-	tp->update_flags = TTY_UPDATE_ALL;
-	tty3270_set_timer(tp, 1);
-	return 0;
-}
-
-static void
-tty3270_deactivate(struct raw3270_view *view)
-{
-	struct tty3270 *tp = container_of(view, struct tty3270, view);
-
-	del_timer(&tp->timer);
-}
-
-static void
-tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
-{
-	/* Handle ATTN. Schedule tasklet to read aid. */
-	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
-		if (!tp->throttle)
-			tty3270_issue_read(tp, 0);
-		else
-			tp->attn = 1;
-	}
-
-	if (rq) {
-		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
-			rq->rc = -EIO;
-			raw3270_get_view(&tp->view);
-			tasklet_schedule(&tp->hanglet);
-		} else {
-			/* Normal end. Copy residual count. */
-			rq->rescnt = irb->scsw.cmd.count;
-		}
-	} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
-		/* Interrupt without an outstanding request -> update all */
-		tp->update_flags = TTY_UPDATE_ALL;
-		tty3270_set_timer(tp, 1);
-	}
-}
-
-/*
- * Allocate tty3270 structure.
- */
-static struct tty3270 *
-tty3270_alloc_view(void)
-{
-	struct tty3270 *tp;
-	int pages;
-
-	tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
-	if (!tp)
-		goto out_err;
-	tp->freemem_pages =
-		kmalloc_array(TTY3270_STRING_PAGES, sizeof(void *),
-			      GFP_KERNEL);
-	if (!tp->freemem_pages)
-		goto out_tp;
-	INIT_LIST_HEAD(&tp->freemem);
-	INIT_LIST_HEAD(&tp->lines);
-	INIT_LIST_HEAD(&tp->update);
-	INIT_LIST_HEAD(&tp->rcl_lines);
-	tp->rcl_max = 20;
-
-	for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
-		tp->freemem_pages[pages] = (void *)
-			__get_free_pages(GFP_KERNEL|GFP_DMA, 0);
-		if (!tp->freemem_pages[pages])
-			goto out_pages;
-		add_string_memory(&tp->freemem,
-				  tp->freemem_pages[pages], PAGE_SIZE);
-	}
-	tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
-	if (IS_ERR(tp->write))
-		goto out_pages;
-	tp->read = raw3270_request_alloc(0);
-	if (IS_ERR(tp->read))
-		goto out_write;
-	tp->kreset = raw3270_request_alloc(1);
-	if (IS_ERR(tp->kreset))
-		goto out_read;
-	tp->kbd = kbd_alloc();
-	if (!tp->kbd)
-		goto out_reset;
-
-	tty_port_init(&tp->port);
-	timer_setup(&tp->timer, tty3270_update, 0);
-	tasklet_init(&tp->readlet, tty3270_read_tasklet,
-		     (unsigned long) tp->read);
-	tasklet_init(&tp->hanglet, tty3270_hangup_tasklet,
-		     (unsigned long) tp);
-	INIT_WORK(&tp->resize_work, tty3270_resize_work);
-
-	return tp;
-
-out_reset:
-	raw3270_request_free(tp->kreset);
-out_read:
-	raw3270_request_free(tp->read);
-out_write:
-	raw3270_request_free(tp->write);
-out_pages:
-	while (pages--)
-		free_pages((unsigned long) tp->freemem_pages[pages], 0);
-	kfree(tp->freemem_pages);
-	tty_port_destroy(&tp->port);
-out_tp:
-	kfree(tp);
-out_err:
-	return ERR_PTR(-ENOMEM);
-}
-
-/*
- * Free tty3270 structure.
- */
-static void
-tty3270_free_view(struct tty3270 *tp)
-{
-	int pages;
-
-	kbd_free(tp->kbd);
-	raw3270_request_free(tp->kreset);
-	raw3270_request_free(tp->read);
-	raw3270_request_free(tp->write);
-	for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
-		free_pages((unsigned long) tp->freemem_pages[pages], 0);
-	kfree(tp->freemem_pages);
-	tty_port_destroy(&tp->port);
-	kfree(tp);
-}
-
-/*
- * Allocate tty3270 screen.
- */
-static struct tty3270_line *
-tty3270_alloc_screen(unsigned int rows, unsigned int cols)
-{
-	struct tty3270_line *screen;
-	unsigned long size;
-	int lines;
-
-	size = sizeof(struct tty3270_line) * (rows - 2);
-	screen = kzalloc(size, GFP_KERNEL);
-	if (!screen)
-		goto out_err;
-	for (lines = 0; lines < rows - 2; lines++) {
-		size = sizeof(struct tty3270_cell) * cols;
-		screen[lines].cells = kzalloc(size, GFP_KERNEL);
-		if (!screen[lines].cells)
-			goto out_screen;
-	}
-	return screen;
-out_screen:
-	while (lines--)
-		kfree(screen[lines].cells);
-	kfree(screen);
-out_err:
-	return ERR_PTR(-ENOMEM);
-}
-
-/*
- * Free tty3270 screen.
- */
-static void
-tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
-{
-	int lines;
-
-	for (lines = 0; lines < rows - 2; lines++)
-		kfree(screen[lines].cells);
-	kfree(screen);
-}
-
-/*
- * Resize tty3270 screen
- */
-static void tty3270_resize_work(struct work_struct *work)
-{
-	struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
-	struct tty3270_line *screen, *oscreen;
-	struct tty_struct *tty;
-	unsigned int orows;
-	struct winsize ws;
-
-	screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
-	if (IS_ERR(screen))
-		return;
-	/* Switch to new output size */
-	spin_lock_bh(&tp->view.lock);
-	tty3270_blank_screen(tp);
-	oscreen = tp->screen;
-	orows = tp->view.rows;
-	tp->view.model = tp->n_model;
-	tp->view.rows = tp->n_rows;
-	tp->view.cols = tp->n_cols;
-	tp->screen = screen;
-	free_string(&tp->freemem, tp->prompt);
-	free_string(&tp->freemem, tp->status);
-	tty3270_create_prompt(tp);
-	tty3270_create_status(tp);
-	while (tp->nr_lines < tp->view.rows - 2)
-		tty3270_blank_line(tp);
-	tp->update_flags = TTY_UPDATE_ALL;
-	spin_unlock_bh(&tp->view.lock);
-	tty3270_free_screen(oscreen, orows);
-	tty3270_set_timer(tp, 1);
-	/* Informat tty layer about new size */
-	tty = tty_port_tty_get(&tp->port);
-	if (!tty)
-		return;
-	ws.ws_row = tp->view.rows - 2;
-	ws.ws_col = tp->view.cols;
-	tty_do_resize(tty, &ws);
-	tty_kref_put(tty);
-}
-
-static void
-tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
-{
-	struct tty3270 *tp = container_of(view, struct tty3270, view);
-
-	if (tp->n_model == model && tp->n_rows == rows && tp->n_cols == cols)
-		return;
-	tp->n_model = model;
-	tp->n_rows = rows;
-	tp->n_cols = cols;
-	schedule_work(&tp->resize_work);
-}
-
-/*
- * Unlink tty3270 data structure from tty.
- */
-static void
-tty3270_release(struct raw3270_view *view)
-{
-	struct tty3270 *tp = container_of(view, struct tty3270, view);
-	struct tty_struct *tty = tty_port_tty_get(&tp->port);
-
-	if (tty) {
-		tty->driver_data = NULL;
-		tty_port_tty_set(&tp->port, NULL);
-		tty_hangup(tty);
-		raw3270_put_view(&tp->view);
-		tty_kref_put(tty);
-	}
-}
-
-/*
- * Free tty3270 data structure
- */
-static void
-tty3270_free(struct raw3270_view *view)
-{
-	struct tty3270 *tp = container_of(view, struct tty3270, view);
-
-	del_timer_sync(&tp->timer);
-	tty3270_free_screen(tp->screen, tp->view.rows);
-	tty3270_free_view(tp);
-}
-
-/*
- * Delayed freeing of tty3270 views.
- */
-static void
-tty3270_del_views(void)
-{
-	int i;
-
-	for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
-		struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
-		if (!IS_ERR(view))
-			raw3270_del_view(view);
-	}
-}
-
-static struct raw3270_fn tty3270_fn = {
-	.activate = tty3270_activate,
-	.deactivate = tty3270_deactivate,
-	.intv = (void *) tty3270_irq,
-	.release = tty3270_release,
-	.free = tty3270_free,
-	.resize = tty3270_resize
-};
-
-/*
- * This routine is called whenever a 3270 tty is opened first time.
- */
-static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
-{
-	struct raw3270_view *view;
-	struct tty3270 *tp;
-	int i, rc;
-
-	/* Check if the tty3270 is already there. */
-	view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
-	if (!IS_ERR(view)) {
-		tp = container_of(view, struct tty3270, view);
-		tty->driver_data = tp;
-		tty->winsize.ws_row = tp->view.rows - 2;
-		tty->winsize.ws_col = tp->view.cols;
-		tp->inattr = TF_INPUT;
-		goto port_install;
-	}
-	if (tty3270_max_index < tty->index + 1)
-		tty3270_max_index = tty->index + 1;
-
-	/* Allocate tty3270 structure on first open. */
-	tp = tty3270_alloc_view();
-	if (IS_ERR(tp))
-		return PTR_ERR(tp);
-
-	rc = raw3270_add_view(&tp->view, &tty3270_fn,
-			      tty->index + RAW3270_FIRSTMINOR,
-			      RAW3270_VIEW_LOCK_BH);
-	if (rc) {
-		tty3270_free_view(tp);
-		return rc;
-	}
-
-	tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
-	if (IS_ERR(tp->screen)) {
-		rc = PTR_ERR(tp->screen);
-		raw3270_put_view(&tp->view);
-		raw3270_del_view(&tp->view);
-		tty3270_free_view(tp);
-		return rc;
-	}
-
-	tty->winsize.ws_row = tp->view.rows - 2;
-	tty->winsize.ws_col = tp->view.cols;
-
-	tty3270_create_prompt(tp);
-	tty3270_create_status(tp);
-	tty3270_update_status(tp);
-
-	/* Create blank line for every line in the tty output area. */
-	for (i = 0; i < tp->view.rows - 2; i++)
-		tty3270_blank_line(tp);
-
-	tp->kbd->port = &tp->port;
-	tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
-	tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
-	tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
-	tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
-	kbd_ascebc(tp->kbd, tp->view.ascebc);
-
-	raw3270_activate_view(&tp->view);
-
-port_install:
-	rc = tty_port_install(&tp->port, driver, tty);
-	if (rc) {
-		raw3270_put_view(&tp->view);
-		return rc;
-	}
-
-	tty->driver_data = tp;
-
-	return 0;
-}
-
-/*
- * This routine is called whenever a 3270 tty is opened.
- */
-static int
-tty3270_open(struct tty_struct *tty, struct file *filp)
-{
-	struct tty3270 *tp = tty->driver_data;
-	struct tty_port *port = &tp->port;
-
-	port->count++;
-	tty_port_tty_set(port, tty);
-	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 void
-tty3270_close(struct tty_struct *tty, struct file * filp)
-{
-	struct tty3270 *tp = tty->driver_data;
-
-	if (tty->count > 1)
-		return;
-	if (tp)
-		tty_port_tty_set(&tp->port, NULL);
-}
-
-static void tty3270_cleanup(struct tty_struct *tty)
-{
-	struct tty3270 *tp = tty->driver_data;
-
-	if (tp) {
-		tty->driver_data = NULL;
-		raw3270_put_view(&tp->view);
-	}
-}
-
-/*
- * We always have room.
- */
-static unsigned int
-tty3270_write_room(struct tty_struct *tty)
-{
-	return INT_MAX;
-}
-
-/*
- * Insert character into the screen at the current position with the
- * current color and highlight. This function does NOT do cursor movement.
- */
-static void tty3270_put_character(struct tty3270 *tp, char ch)
-{
-	struct tty3270_line *line;
-	struct tty3270_cell *cell;
-
-	line = tp->screen + tp->cy;
-	if (line->len <= tp->cx) {
-		while (line->len < tp->cx) {
-			cell = line->cells + line->len;
-			cell->character = tp->view.ascebc[' '];
-			cell->highlight = tp->highlight;
-			cell->f_color = tp->f_color;
-			line->len++;
-		}
-		line->len++;
-	}
-	cell = line->cells + tp->cx;
-	cell->character = tp->view.ascebc[(unsigned int) ch];
-	cell->highlight = tp->highlight;
-	cell->f_color = tp->f_color;
-}
-
-/*
- * Convert a tty3270_line to a 3270 data fragment usable for output.
- */
-static void
-tty3270_convert_line(struct tty3270 *tp, int line_nr)
-{
-	struct tty3270_line *line;
-	struct tty3270_cell *cell;
-	struct string *s, *n;
-	unsigned char highlight;
-	unsigned char f_color;
-	char *cp;
-	int flen, i;
-
-	/* Determine how long the fragment will be. */
-	flen = 3;		/* Prefix (TO_SBA). */
-	line = tp->screen + line_nr;
-	flen += line->len;
-	highlight = TAX_RESET;
-	f_color = TAC_RESET;
-	for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
-		if (cell->highlight != highlight) {
-			flen += 3;	/* TO_SA to switch highlight. */
-			highlight = cell->highlight;
-		}
-		if (cell->f_color != f_color) {
-			flen += 3;	/* TO_SA to switch color. */
-			f_color = cell->f_color;
-		}
-	}
-	if (highlight != TAX_RESET)
-		flen += 3;	/* TO_SA to reset hightlight. */
-	if (f_color != TAC_RESET)
-		flen += 3;	/* TO_SA to reset color. */
-	if (line->len < tp->view.cols)
-		flen += 4;	/* Postfix (TO_RA). */
-
-	/* Find the line in the list. */
-	i = tp->view.rows - 2 - line_nr;
-	list_for_each_entry_reverse(s, &tp->lines, list)
-		if (--i <= 0)
-			break;
-	/*
-	 * Check if the line needs to get reallocated.
-	 */
-	if (s->len != flen) {
-		/* Reallocate string. */
-		n = tty3270_alloc_string(tp, flen);
-		list_add(&n->list, &s->list);
-		list_del_init(&s->list);
-		if (!list_empty(&s->update))
-			list_del_init(&s->update);
-		free_string(&tp->freemem, s);
-		s = n;
-	}
-
-	/* Write 3270 data fragment. */
-	cp = s->string;
-	*cp++ = TO_SBA;
-	*cp++ = 0;
-	*cp++ = 0;
-
-	highlight = TAX_RESET;
-	f_color = TAC_RESET;
-	for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
-		if (cell->highlight != highlight) {
-			*cp++ = TO_SA;
-			*cp++ = TAT_EXTHI;
-			*cp++ = cell->highlight;
-			highlight = cell->highlight;
-		}
-		if (cell->f_color != f_color) {
-			*cp++ = TO_SA;
-			*cp++ = TAT_COLOR;
-			*cp++ = cell->f_color;
-			f_color = cell->f_color;
-		}
-		*cp++ = cell->character;
-	}
-	if (highlight != TAX_RESET) {
-		*cp++ = TO_SA;
-		*cp++ = TAT_EXTHI;
-		*cp++ = TAX_RESET;
-	}
-	if (f_color != TAC_RESET) {
-		*cp++ = TO_SA;
-		*cp++ = TAT_COLOR;
-		*cp++ = TAC_RESET;
-	}
-	if (line->len < tp->view.cols) {
-		*cp++ = TO_RA;
-		*cp++ = 0;
-		*cp++ = 0;
-		*cp++ = 0;
-	}
-
-	if (tp->nr_up + line_nr < tp->view.rows - 2) {
-		/* Line is currently visible on screen. */
-		tty3270_update_string(tp, s, line_nr);
-		/* Add line to update list. */
-		if (list_empty(&s->update)) {
-			list_add_tail(&s->update, &tp->update);
-			tp->update_flags |= TTY_UPDATE_LIST;
-		}
-	}
-}
-
-/*
- * Do carriage return.
- */
-static void
-tty3270_cr(struct tty3270 *tp)
-{
-	tp->cx = 0;
-}
-
-/*
- * Do line feed.
- */
-static void
-tty3270_lf(struct tty3270 *tp)
-{
-	struct tty3270_line temp;
-	int i;
-
-	tty3270_convert_line(tp, tp->cy);
-	if (tp->cy < tp->view.rows - 3) {
-		tp->cy++;
-		return;
-	}
-	/* Last line just filled up. Add new, blank line. */
-	tty3270_blank_line(tp);
-	temp = tp->screen[0];
-	temp.len = 0;
-	for (i = 0; i < tp->view.rows - 3; i++)
-		tp->screen[i] = tp->screen[i+1];
-	tp->screen[tp->view.rows - 3] = temp;
-	tty3270_rebuild_update(tp);
-}
-
-static void
-tty3270_ri(struct tty3270 *tp)
-{
-	if (tp->cy > 0) {
-	    tty3270_convert_line(tp, tp->cy);
-	    tp->cy--;
-	}
-}
-
-/*
- * Insert characters at current position.
- */
-static void
-tty3270_insert_characters(struct tty3270 *tp, int n)
-{
-	struct tty3270_line *line;
-	int k;
-
-	line = tp->screen + tp->cy;
-	while (line->len < tp->cx) {
-		line->cells[line->len].character = tp->view.ascebc[' '];
-		line->cells[line->len].highlight = TAX_RESET;
-		line->cells[line->len].f_color = TAC_RESET;
-		line->len++;
-	}
-	if (n > tp->view.cols - tp->cx)
-		n = tp->view.cols - tp->cx;
-	k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
-	while (k--)
-		line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
-	line->len += n;
-	if (line->len > tp->view.cols)
-		line->len = tp->view.cols;
-	while (n-- > 0) {
-		line->cells[tp->cx + n].character = tp->view.ascebc[' '];
-		line->cells[tp->cx + n].highlight = tp->highlight;
-		line->cells[tp->cx + n].f_color = tp->f_color;
-	}
-}
-
-/*
- * Delete characters at current position.
- */
-static void
-tty3270_delete_characters(struct tty3270 *tp, int n)
-{
-	struct tty3270_line *line;
-	int i;
-
-	line = tp->screen + tp->cy;
-	if (line->len <= tp->cx)
-		return;
-	if (line->len - tp->cx <= n) {
-		line->len = tp->cx;
-		return;
-	}
-	for (i = tp->cx; i + n < line->len; i++)
-		line->cells[i] = line->cells[i + n];
-	line->len -= n;
-}
-
-/*
- * Erase characters at current position.
- */
-static void
-tty3270_erase_characters(struct tty3270 *tp, int n)
-{
-	struct tty3270_line *line;
-	struct tty3270_cell *cell;
-
-	line = tp->screen + tp->cy;
-	while (line->len > tp->cx && n-- > 0) {
-		cell = line->cells + tp->cx++;
-		cell->character = ' ';
-		cell->highlight = TAX_RESET;
-		cell->f_color = TAC_RESET;
-	}
-	tp->cx += n;
-	tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
-}
-
-/*
- * Erase line, 3 different cases:
- *  Esc [ 0 K	Erase from current position to end of line inclusive
- *  Esc [ 1 K	Erase from beginning of line to current position inclusive
- *  Esc [ 2 K	Erase entire line (without moving cursor)
- */
-static void
-tty3270_erase_line(struct tty3270 *tp, int mode)
-{
-	struct tty3270_line *line;
-	struct tty3270_cell *cell;
-	int i;
-
-	line = tp->screen + tp->cy;
-	if (mode == 0)
-		line->len = tp->cx;
-	else if (mode == 1) {
-		for (i = 0; i < tp->cx; i++) {
-			cell = line->cells + i;
-			cell->character = ' ';
-			cell->highlight = TAX_RESET;
-			cell->f_color = TAC_RESET;
-		}
-		if (line->len <= tp->cx)
-			line->len = tp->cx + 1;
-	} else if (mode == 2)
-		line->len = 0;
-	tty3270_convert_line(tp, tp->cy);
-}
-
-/*
- * Erase display, 3 different cases:
- *  Esc [ 0 J	Erase from current position to bottom of screen inclusive
- *  Esc [ 1 J	Erase from top of screen to current position inclusive
- *  Esc [ 2 J	Erase entire screen (without moving the cursor)
- */
-static void
-tty3270_erase_display(struct tty3270 *tp, int mode)
-{
-	int i;
-
-	if (mode == 0) {
-		tty3270_erase_line(tp, 0);
-		for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
-			tp->screen[i].len = 0;
-			tty3270_convert_line(tp, i);
-		}
-	} else if (mode == 1) {
-		for (i = 0; i < tp->cy; i++) {
-			tp->screen[i].len = 0;
-			tty3270_convert_line(tp, i);
-		}
-		tty3270_erase_line(tp, 1);
-	} else if (mode == 2) {
-		for (i = 0; i < tp->view.rows - 2; i++) {
-			tp->screen[i].len = 0;
-			tty3270_convert_line(tp, i);
-		}
-	}
-	tty3270_rebuild_update(tp);
-}
-
-/*
- * Set attributes found in an escape sequence.
- *  Esc [ <attr> ; <attr> ; ... m
- */
-static void
-tty3270_set_attributes(struct tty3270 *tp)
-{
-	static unsigned char f_colors[] = {
-		TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
-		TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
-	};
-	int i, attr;
-
-	for (i = 0; i <= tp->esc_npar; i++) {
-		attr = tp->esc_par[i];
-		switch (attr) {
-		case 0:		/* Reset */
-			tp->highlight = TAX_RESET;
-			tp->f_color = TAC_RESET;
-			break;
-		/* Highlight. */
-		case 4:		/* Start underlining. */
-			tp->highlight = TAX_UNDER;
-			break;
-		case 5:		/* Start blink. */
-			tp->highlight = TAX_BLINK;
-			break;
-		case 7:		/* Start reverse. */
-			tp->highlight = TAX_REVER;
-			break;
-		case 24:	/* End underlining */
-			if (tp->highlight == TAX_UNDER)
-				tp->highlight = TAX_RESET;
-			break;
-		case 25:	/* End blink. */
-			if (tp->highlight == TAX_BLINK)
-				tp->highlight = TAX_RESET;
-			break;
-		case 27:	/* End reverse. */
-			if (tp->highlight == TAX_REVER)
-				tp->highlight = TAX_RESET;
-			break;
-		/* Foreground color. */
-		case 30:	/* Black */
-		case 31:	/* Red */
-		case 32:	/* Green */
-		case 33:	/* Yellow */
-		case 34:	/* Blue */
-		case 35:	/* Magenta */
-		case 36:	/* Cyan */
-		case 37:	/* White */
-		case 39:	/* Black */
-			tp->f_color = f_colors[attr - 30];
-			break;
-		}
-	}
-}
-
-static inline int
-tty3270_getpar(struct tty3270 *tp, int ix)
-{
-	return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
-}
-
-static void
-tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
-{
-	int max_cx = max(0, cx);
-	int max_cy = max(0, cy);
-
-	tp->cx = min_t(int, tp->view.cols - 1, max_cx);
-	cy = min_t(int, tp->view.rows - 3, max_cy);
-	if (cy != tp->cy) {
-		tty3270_convert_line(tp, tp->cy);
-		tp->cy = cy;
-	}
-}
-
-/*
- * Process escape sequences. Known sequences:
- *  Esc 7			Save Cursor Position
- *  Esc 8			Restore Cursor Position
- *  Esc [ Pn ; Pn ; .. m	Set attributes
- *  Esc [ Pn ; Pn H		Cursor Position
- *  Esc [ Pn ; Pn f		Cursor Position
- *  Esc [ Pn A			Cursor Up
- *  Esc [ Pn B			Cursor Down
- *  Esc [ Pn C			Cursor Forward
- *  Esc [ Pn D			Cursor Backward
- *  Esc [ Pn G			Cursor Horizontal Absolute
- *  Esc [ Pn X			Erase Characters
- *  Esc [ Ps J			Erase in Display
- *  Esc [ Ps K			Erase in Line
- * // FIXME: add all the new ones.
- *
- *  Pn is a numeric parameter, a string of zero or more decimal digits.
- *  Ps is a selective parameter.
- */
-static void
-tty3270_escape_sequence(struct tty3270 *tp, char ch)
-{
-	enum { ESnormal, ESesc, ESsquare, ESgetpars };
-
-	if (tp->esc_state == ESnormal) {
-		if (ch == 0x1b)
-			/* Starting new escape sequence. */
-			tp->esc_state = ESesc;
-		return;
-	}
-	if (tp->esc_state == ESesc) {
-		tp->esc_state = ESnormal;
-		switch (ch) {
-		case '[':
-			tp->esc_state = ESsquare;
-			break;
-		case 'E':
-			tty3270_cr(tp);
-			tty3270_lf(tp);
-			break;
-		case 'M':
-			tty3270_ri(tp);
-			break;
-		case 'D':
-			tty3270_lf(tp);
-			break;
-		case 'Z':		/* Respond ID. */
-			kbd_puts_queue(&tp->port, "\033[?6c");
-			break;
-		case '7':		/* Save cursor position. */
-			tp->saved_cx = tp->cx;
-			tp->saved_cy = tp->cy;
-			tp->saved_highlight = tp->highlight;
-			tp->saved_f_color = tp->f_color;
-			break;
-		case '8':		/* Restore cursor position. */
-			tty3270_convert_line(tp, tp->cy);
-			tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
-			tp->highlight = tp->saved_highlight;
-			tp->f_color = tp->saved_f_color;
-			break;
-		case 'c':		/* Reset terminal. */
-			tp->cx = tp->saved_cx = 0;
-			tp->cy = tp->saved_cy = 0;
-			tp->highlight = tp->saved_highlight = TAX_RESET;
-			tp->f_color = tp->saved_f_color = TAC_RESET;
-			tty3270_erase_display(tp, 2);
-			break;
-		}
-		return;
-	}
-	if (tp->esc_state == ESsquare) {
-		tp->esc_state = ESgetpars;
-		memset(tp->esc_par, 0, sizeof(tp->esc_par));
-		tp->esc_npar = 0;
-		tp->esc_ques = (ch == '?');
-		if (tp->esc_ques)
-			return;
-	}
-	if (tp->esc_state == ESgetpars) {
-		if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
-			tp->esc_npar++;
-			return;
-		}
-		if (ch >= '0' && ch <= '9') {
-			tp->esc_par[tp->esc_npar] *= 10;
-			tp->esc_par[tp->esc_npar] += ch - '0';
-			return;
-		}
-	}
-	tp->esc_state = ESnormal;
-	if (ch == 'n' && !tp->esc_ques) {
-		if (tp->esc_par[0] == 5)		/* Status report. */
-			kbd_puts_queue(&tp->port, "\033[0n");
-		else if (tp->esc_par[0] == 6) {	/* Cursor report. */
-			char buf[40];
-			sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
-			kbd_puts_queue(&tp->port, buf);
-		}
-		return;
-	}
-	if (tp->esc_ques)
-		return;
-	switch (ch) {
-	case 'm':
-		tty3270_set_attributes(tp);
-		break;
-	case 'H':	/* Set cursor position. */
-	case 'f':
-		tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
-				tty3270_getpar(tp, 0) - 1);
-		break;
-	case 'd':	/* Set y position. */
-		tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
-		break;
-	case 'A':	/* Cursor up. */
-	case 'F':
-		tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
-		break;
-	case 'B':	/* Cursor down. */
-	case 'e':
-	case 'E':
-		tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
-		break;
-	case 'C':	/* Cursor forward. */
-	case 'a':
-		tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
-		break;
-	case 'D':	/* Cursor backward. */
-		tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
-		break;
-	case 'G':	/* Set x position. */
-	case '`':
-		tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
-		break;
-	case 'X':	/* Erase Characters. */
-		tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
-		break;
-	case 'J':	/* Erase display. */
-		tty3270_erase_display(tp, tp->esc_par[0]);
-		break;
-	case 'K':	/* Erase line. */
-		tty3270_erase_line(tp, tp->esc_par[0]);
-		break;
-	case 'P':	/* Delete characters. */
-		tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
-		break;
-	case '@':	/* Insert characters. */
-		tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
-		break;
-	case 's':	/* Save cursor position. */
-		tp->saved_cx = tp->cx;
-		tp->saved_cy = tp->cy;
-		tp->saved_highlight = tp->highlight;
-		tp->saved_f_color = tp->f_color;
-		break;
-	case 'u':	/* Restore cursor position. */
-		tty3270_convert_line(tp, tp->cy);
-		tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
-		tp->highlight = tp->saved_highlight;
-		tp->f_color = tp->saved_f_color;
-		break;
-	}
-}
-
-/*
- * String write routine for 3270 ttys
- */
-static void
-tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
-		const unsigned char *buf, int count)
-{
-	int i_msg, i;
-
-	spin_lock_bh(&tp->view.lock);
-	for (i_msg = 0; !tty->flow.stopped && i_msg < count; i_msg++) {
-		if (tp->esc_state != 0) {
-			/* Continue escape sequence. */
-			tty3270_escape_sequence(tp, buf[i_msg]);
-			continue;
-		}
-
-		switch (buf[i_msg]) {
-		case 0x07:		/* '\a' -- Alarm */
-			tp->wcc |= TW_PLUSALARM;
-			break;
-		case 0x08:		/* Backspace. */
-			if (tp->cx > 0) {
-				tp->cx--;
-				tty3270_put_character(tp, ' ');
-			}
-			break;
-		case 0x09:		/* '\t' -- Tabulate */
-			for (i = tp->cx % 8; i < 8; i++) {
-				if (tp->cx >= tp->view.cols) {
-					tty3270_cr(tp);
-					tty3270_lf(tp);
-					break;
-				}
-				tty3270_put_character(tp, ' ');
-				tp->cx++;
-			}
-			break;
-		case 0x0a:		/* '\n' -- New Line */
-			tty3270_cr(tp);
-			tty3270_lf(tp);
-			break;
-		case 0x0c:		/* '\f' -- Form Feed */
-			tty3270_erase_display(tp, 2);
-			tp->cx = tp->cy = 0;
-			break;
-		case 0x0d:		/* '\r' -- Carriage Return */
-			tp->cx = 0;
-			break;
-		case 0x0f:		/* SuSE "exit alternate mode" */
-			break;
-		case 0x1b:		/* Start escape sequence. */
-			tty3270_escape_sequence(tp, buf[i_msg]);
-			break;
-		default:		/* Insert normal character. */
-			if (tp->cx >= tp->view.cols) {
-				tty3270_cr(tp);
-				tty3270_lf(tp);
-			}
-			tty3270_put_character(tp, buf[i_msg]);
-			tp->cx++;
-			break;
-		}
-	}
-	/* Convert current line to 3270 data fragment. */
-	tty3270_convert_line(tp, tp->cy);
-
-	/* Setup timer to update display after 1/10 second */
-	if (!timer_pending(&tp->timer))
-		tty3270_set_timer(tp, HZ/10);
-
-	spin_unlock_bh(&tp->view.lock);
-}
-
-/*
- * String write routine for 3270 ttys
- */
-static int
-tty3270_write(struct tty_struct * tty,
-	      const unsigned char *buf, int count)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return 0;
-	if (tp->char_count > 0) {
-		tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
-		tp->char_count = 0;
-	}
-	tty3270_do_write(tp, tty, buf, count);
-	return count;
-}
-
-/*
- * Put single characters to the ttys character buffer
- */
-static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
-		return 0;
-	tp->char_buf[tp->char_count++] = ch;
-	return 1;
-}
-
-/*
- * Flush all characters from the ttys characeter buffer put there
- * by tty3270_put_char.
- */
-static void
-tty3270_flush_chars(struct tty_struct *tty)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return;
-	if (tp->char_count > 0) {
-		tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
-		tp->char_count = 0;
-	}
-}
-
-/*
- * Check for visible/invisible input switches
- */
-static void
-tty3270_set_termios(struct tty_struct *tty, const struct ktermios *old)
-{
-	struct tty3270 *tp;
-	int new;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return;
-	spin_lock_bh(&tp->view.lock);
-	if (L_ICANON(tty)) {
-		new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
-		if (new != tp->inattr) {
-			tp->inattr = new;
-			tty3270_update_prompt(tp, NULL, 0);
-			tty3270_set_timer(tp, 1);
-		}
-	}
-	spin_unlock_bh(&tp->view.lock);
-}
-
-/*
- * Disable reading from a 3270 tty
- */
-static void
-tty3270_throttle(struct tty_struct * tty)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return;
-	tp->throttle = 1;
-}
-
-/*
- * Enable reading from a 3270 tty
- */
-static void
-tty3270_unthrottle(struct tty_struct * tty)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return;
-	tp->throttle = 0;
-	if (tp->attn)
-		tty3270_issue_read(tp, 1);
-}
-
-/*
- * Hang up the tty device.
- */
-static void
-tty3270_hangup(struct tty_struct *tty)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return;
-	spin_lock_bh(&tp->view.lock);
-	tp->cx = tp->saved_cx = 0;
-	tp->cy = tp->saved_cy = 0;
-	tp->highlight = tp->saved_highlight = TAX_RESET;
-	tp->f_color = tp->saved_f_color = TAC_RESET;
-	tty3270_blank_screen(tp);
-	while (tp->nr_lines < tp->view.rows - 2)
-		tty3270_blank_line(tp);
-	tp->update_flags = TTY_UPDATE_ALL;
-	spin_unlock_bh(&tp->view.lock);
-	tty3270_set_timer(tp, 1);
-}
-
-static void
-tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
-{
-}
-
-static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
-			 unsigned long arg)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return -ENODEV;
-	if (tty_io_error(tty))
-		return -EIO;
-	return kbd_ioctl(tp->kbd, cmd, arg);
-}
-
-#ifdef CONFIG_COMPAT
-static long tty3270_compat_ioctl(struct tty_struct *tty,
-				 unsigned int cmd, unsigned long arg)
-{
-	struct tty3270 *tp;
-
-	tp = tty->driver_data;
-	if (!tp)
-		return -ENODEV;
-	if (tty_io_error(tty))
-		return -EIO;
-	return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static const struct tty_operations tty3270_ops = {
-	.install = tty3270_install,
-	.cleanup = tty3270_cleanup,
-	.open = tty3270_open,
-	.close = tty3270_close,
-	.write = tty3270_write,
-	.put_char = tty3270_put_char,
-	.flush_chars = tty3270_flush_chars,
-	.write_room = tty3270_write_room,
-	.throttle = tty3270_throttle,
-	.unthrottle = tty3270_unthrottle,
-	.hangup = tty3270_hangup,
-	.wait_until_sent = tty3270_wait_until_sent,
-	.ioctl = tty3270_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = tty3270_compat_ioctl,
-#endif
-	.set_termios = tty3270_set_termios
-};
-
-static void tty3270_create_cb(int minor)
-{
-	tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
-}
-
-static void tty3270_destroy_cb(int minor)
-{
-	tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
-}
-
-static struct raw3270_notifier tty3270_notifier =
-{
-	.create = tty3270_create_cb,
-	.destroy = tty3270_destroy_cb,
-};
-
-/*
- * 3270 tty registration code called from tty_init().
- * Most kernel services (incl. kmalloc) are available at this poimt.
- */
-static int __init tty3270_init(void)
-{
-	struct tty_driver *driver;
-	int ret;
-
-	driver = tty_alloc_driver(RAW3270_MAXDEVS,
-				  TTY_DRIVER_REAL_RAW |
-				  TTY_DRIVER_DYNAMIC_DEV |
-				  TTY_DRIVER_RESET_TERMIOS);
-	if (IS_ERR(driver))
-		return PTR_ERR(driver);
-
-	/*
-	 * Initialize the tty_driver structure
-	 * Entries in tty3270_driver that are NOT initialized:
-	 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
-	 */
-	driver->driver_name = "tty3270";
-	driver->name = "3270/tty";
-	driver->major = IBM_TTY3270_MAJOR;
-	driver->minor_start = RAW3270_FIRSTMINOR;
-	driver->name_base = RAW3270_FIRSTMINOR;
-	driver->type = TTY_DRIVER_TYPE_SYSTEM;
-	driver->subtype = SYSTEM_TYPE_TTY;
-	driver->init_termios = tty_std_termios;
-	tty_set_operations(driver, &tty3270_ops);
-	ret = tty_register_driver(driver);
-	if (ret) {
-		tty_driver_kref_put(driver);
-		return ret;
-	}
-	tty3270_driver = driver;
-	raw3270_register_notifier(&tty3270_notifier);
-	return 0;
-}
-
-static void __exit
-tty3270_exit(void)
-{
-	struct tty_driver *driver;
-
-	raw3270_unregister_notifier(&tty3270_notifier);
-	driver = tty3270_driver;
-	tty3270_driver = NULL;
-	tty_unregister_driver(driver);
-	tty_driver_kref_put(driver);
-	tty3270_del_views();
-}
-
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
-
-module_init(tty3270_init);
-module_exit(tty3270_exit);