linux/drivers/s390/char/tty3270.c
Martin Schwidefsky 5712f3301a s390/3270: fix lockdep false positive on view->lock
The spinlock in the raw3270_view structure is used by con3270, tty3270
and fs3270 in different ways. For con3270 the lock can be acquired in
irq context, for tty3270 and fs3270 the highest context is bh.

Lockdep sees the view->lock as a single class and if the 3270 driver
is used for the console the following message is generated:

WARNING: inconsistent lock state
5.1.0-rc3-05157-g5c168033979d #12 Not tainted
--------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
swapper/0/1 [HC0[0]:SC1[1]:HE1:SE0] takes:
(____ptrval____) (&(&view->lock)->rlock){?.-.}, at: tty3270_update+0x7c/0x330

Introduce a lockdep subclass for the view lock to distinguish bh from
irq locks.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2019-04-10 17:46:22 +02:00

1982 lines
46 KiB
C

// 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(struct raw3270_request *rrq)
{
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(struct tty3270 *tp)
{
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,
(void (*)(unsigned long)) tty3270_read_tasklet,
(unsigned long) tp->read);
tasklet_init(&tp->hanglet,
(void (*)(unsigned long)) 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->port.low_latency = 0;
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;
}
tp->port.low_latency = 0;
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 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->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;
}
}
/*
* Returns the number of characters in the output buffer. This is
* used in tty_wait_until_sent to wait until all characters have
* appeared on the screen.
*/
static int
tty3270_chars_in_buffer(struct tty_struct *tty)
{
return 0;
}
static void
tty3270_flush_buffer(struct tty_struct *tty)
{
}
/*
* Check for visible/invisible input switches
*/
static void
tty3270_set_termios(struct tty_struct *tty, 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,
.chars_in_buffer = tty3270_chars_in_buffer,
.flush_buffer = tty3270_flush_buffer,
.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) {
put_tty_driver(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);
put_tty_driver(driver);
tty3270_del_views();
}
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
module_init(tty3270_init);
module_exit(tty3270_exit);