/*
* 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/bootmem.h>
#include <linux/compat.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/ebcdic.h>
#include <asm/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 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 tty3270 *);
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)
{
if (expires == 0)
del_timer(&tp->timer);
else
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++;
}
/*
* 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 tty3270 *tp)
{
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);
sba = s->string + s->len - 3;
}
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);
}
}
/*
* 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 int
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;
else
/* Normal end. Copy residual count. */
rq->rescnt = irb->scsw.cmd.count;
}
return RAW3270_IO_DONE;
}
/*
* 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(sizeof(void *) * TTY3270_STRING_PAGES, 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);
setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
(unsigned long) tp);
tasklet_init(&tp->readlet,
(void (*)(unsigned long)) tty3270_read_tasklet,
(unsigned long) tp->read);
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;
del_timer_sync(&tp->timer);
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 (!screen)
return;
/* Switch to new output size */
spin_lock_bh(&tp->view.lock);
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);
tp->nr_up = 0;
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);
}
static void
tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
{
struct tty3270 *tp = container_of(view, struct tty3270, view);
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);
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;
/* why to reassign? */
tty_port_tty_set(&tp->port, tty);
tp->inattr = TF_INPUT;
return tty_port_install(&tp->port, driver, tty);
}
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);
if (rc) {
tty3270_free_view(tp);
return rc;
}
tp->screen = tty3270_alloc_screen(tp->view.cols, tp->view.rows);
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_port_tty_set(&tp->port, tty);
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);
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->driver_data = NULL;
tty_port_tty_set(&tp->port, NULL);
}
}
static void tty3270_cleanup(struct tty_struct *tty)
{
struct tty3270 *tp = tty->driver_data;
if (tp)
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)
{
// FIXME: implement
}
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->flags & (1 << TTY_IO_ERROR))
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->flags & (1 << TTY_IO_ERROR))
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
};
void tty3270_create_cb(int minor)
{
tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
}
void tty3270_destroy_cb(int minor)
{
tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
}
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);