/*
* Atari Keyboard driver for 680x0 Linux
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
/*
* Atari support by Robert de Vries
* enhanced by Bjoern Brauel and Roman Hodek
*
* 2.6 and input cleanup (removed autorepeat stuff) for 2.6.21
* 06/07 Michael Schmitz
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/keyboard.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/kd.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/kbd_kern.h>
#include <asm/atariints.h>
#include <asm/atarihw.h>
#include <asm/atarikb.h>
#include <asm/atari_joystick.h>
#include <asm/irq.h>
/* Hook for MIDI serial driver */
void (*atari_MIDI_interrupt_hook) (void);
/* Hook for keyboard inputdev driver */
void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
/* Hook for mouse inputdev driver */
void (*atari_input_mouse_interrupt_hook) (char *);
EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook);
EXPORT_SYMBOL(atari_input_mouse_interrupt_hook);
/* variables for IKBD self test: */
/* state: 0: off; >0: in progress; >1: 0xf1 received */
static volatile int ikbd_self_test;
/* timestamp when last received a char */
static volatile unsigned long self_test_last_rcv;
/* bitmap of keys reported as broken */
static unsigned long broken_keys[128/(sizeof(unsigned long)*8)] = { 0, };
#define BREAK_MASK (0x80)
/*
* ++roman: The following changes were applied manually:
*
* - The Alt (= Meta) key works in combination with Shift and
* Control, e.g. Alt+Shift+a sends Meta-A (0xc1), Alt+Control+A sends
* Meta-Ctrl-A (0x81) ...
*
* - The parentheses on the keypad send '(' and ')' with all
* modifiers (as would do e.g. keypad '+'), but they cannot be used as
* application keys (i.e. sending Esc O c).
*
* - HELP and UNDO are mapped to be F21 and F24, resp, that send the
* codes "\E[M" and "\E[P". (This is better than the old mapping to
* F11 and F12, because these codes are on Shift+F1/2 anyway.) This
* way, applications that allow their own keyboard mappings
* (e.g. tcsh, X Windows) can be configured to use them in the way
* the label suggests (providing help or undoing).
*
* - Console switching is done with Alt+Fx (consoles 1..10) and
* Shift+Alt+Fx (consoles 11..20).
*
* - The misc. special function implemented in the kernel are mapped
* to the following key combinations:
*
* ClrHome -> Home/Find
* Shift + ClrHome -> End/Select
* Shift + Up -> Page Up
* Shift + Down -> Page Down
* Alt + Help -> show system status
* Shift + Help -> show memory info
* Ctrl + Help -> show registers
* Ctrl + Alt + Del -> Reboot
* Alt + Undo -> switch to last console
* Shift + Undo -> send interrupt
* Alt + Insert -> stop/start output (same as ^S/^Q)
* Alt + Up -> Scroll back console (if implemented)
* Alt + Down -> Scroll forward console (if implemented)
* Alt + CapsLock -> NumLock
*
* ++Andreas:
*
* - Help mapped to K_HELP
* - Undo mapped to K_UNDO (= K_F246)
* - Keypad Left/Right Parenthesis mapped to new K_PPAREN[LR]
*/
typedef enum kb_state_t {
KEYBOARD, AMOUSE, RMOUSE, JOYSTICK, CLOCK, RESYNC
} KB_STATE_T;
#define IS_SYNC_CODE(sc) ((sc) >= 0x04 && (sc) <= 0xfb)
typedef struct keyboard_state {
unsigned char buf[6];
int len;
KB_STATE_T state;
} KEYBOARD_STATE;
KEYBOARD_STATE kb_state;
/* ++roman: If a keyboard overrun happened, we can't tell in general how much
* bytes have been lost and in which state of the packet structure we are now.
* This usually causes keyboards bytes to be interpreted as mouse movements
* and vice versa, which is very annoying. It seems better to throw away some
* bytes (that are usually mouse bytes) than to misinterpret them. Therefore I
* introduced the RESYNC state for IKBD data. In this state, the bytes up to
* one that really looks like a key event (0x04..0xf2) or the start of a mouse
* packet (0xf8..0xfb) are thrown away, but at most 2 bytes. This at least
* speeds up the resynchronization of the event structure, even if maybe a
* mouse movement is lost. However, nothing is perfect. For bytes 0x01..0x03,
* it's really hard to decide whether they're mouse or keyboard bytes. Since
* overruns usually occur when moving the Atari mouse rapidly, they're seen as
* mouse bytes here. If this is wrong, only a make code of the keyboard gets
* lost, which isn't too bad. Losing a break code would be disastrous,
* because then the keyboard repeat strikes...
*/
static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy)
{
u_char acia_stat;
int scancode;
int break_flag;
repeat:
if (acia.mid_ctrl & ACIA_IRQ)
if (atari_MIDI_interrupt_hook)
atari_MIDI_interrupt_hook();
acia_stat = acia.key_ctrl;
/* check out if the interrupt came from this ACIA */
if (!((acia_stat | acia.mid_ctrl) & ACIA_IRQ))
return IRQ_HANDLED;
if (acia_stat & ACIA_OVRN) {
/* a very fast typist or a slow system, give a warning */
/* ...happens often if interrupts were disabled for too long */
printk(KERN_DEBUG "Keyboard overrun\n");
scancode = acia.key_data;
if (ikbd_self_test)
/* During self test, don't do resyncing, just process the code */
goto interpret_scancode;
else if (IS_SYNC_CODE(scancode)) {
/* This code seem already to be the start of a new packet or a
* single scancode */
kb_state.state = KEYBOARD;
goto interpret_scancode;
} else {
/* Go to RESYNC state and skip this byte */
kb_state.state = RESYNC;
kb_state.len = 1; /* skip max. 1 another byte */
goto repeat;
}
}
if (acia_stat & ACIA_RDRF) {
/* received a character */
scancode = acia.key_data; /* get it or reset the ACIA, I'll get it! */
interpret_scancode:
switch (kb_state.state) {
case KEYBOARD:
switch (scancode) {
case 0xF7:
kb_state.state = AMOUSE;
kb_state.len = 0;
break;
case 0xF8:
case 0xF9:
case 0xFA:
case 0xFB:
kb_state.state = RMOUSE;
kb_state.len = 1;
kb_state.buf[0] = scancode;
break;
case 0xFC:
kb_state.state = CLOCK;
kb_state.len = 0;
break;
case 0xFE:
case 0xFF:
kb_state.state = JOYSTICK;
kb_state.len = 1;
kb_state.buf[0] = scancode;
break;
case 0xF1:
/* during self-test, note that 0xf1 received */
if (ikbd_self_test) {
++ikbd_self_test;
self_test_last_rcv = jiffies;
break;
}
/* FALL THROUGH */
default:
break_flag = scancode & BREAK_MASK;
scancode &= ~BREAK_MASK;
if (ikbd_self_test) {
/* Scancodes sent during the self-test stand for broken
* keys (keys being down). The code *should* be a break
* code, but nevertheless some AT keyboard interfaces send
* make codes instead. Therefore, simply ignore
* break_flag...
*/
int keyval, keytyp;
set_bit(scancode, broken_keys);
self_test_last_rcv = jiffies;
/* new Linux scancodes; approx. */
keyval = scancode;
keytyp = KTYP(keyval) - 0xf0;
keyval = KVAL(keyval);
printk(KERN_WARNING "Key with scancode %d ", scancode);
if (keytyp == KT_LATIN || keytyp == KT_LETTER) {
if (keyval < ' ')
printk("('^%c') ", keyval + '@');
else
printk("('%c') ", keyval);
}
printk("is broken -- will be ignored.\n");
break;
} else if (test_bit(scancode, broken_keys))
break;
if (atari_input_keyboard_interrupt_hook)
atari_input_keyboard_interrupt_hook((unsigned char)scancode, !break_flag);
break;
}
break;
case AMOUSE:
kb_state.buf[kb_state.len++] = scancode;
if (kb_state.len == 5) {
kb_state.state = KEYBOARD;
/* not yet used */
/* wake up someone waiting for this */
}
break;
case RMOUSE:
kb_state.buf[kb_state.len++] = scancode;
if (kb_state.len == 3) {
kb_state.state = KEYBOARD;
if (atari_input_mouse_interrupt_hook)
atari_input_mouse_interrupt_hook(kb_state.buf);
}
break;
case JOYSTICK:
kb_state.buf[1] = scancode;
kb_state.state = KEYBOARD;
#ifdef FIXED_ATARI_JOYSTICK
atari_joystick_interrupt(kb_state.buf);
#endif
break;
case CLOCK:
kb_state.buf[kb_state.len++] = scancode;
if (kb_state.len == 6) {
kb_state.state = KEYBOARD;
/* wake up someone waiting for this.
But will this ever be used, as Linux keeps its own time.
Perhaps for synchronization purposes? */
/* wake_up_interruptible(&clock_wait); */
}
break;
case RESYNC:
if (kb_state.len <= 0 || IS_SYNC_CODE(scancode)) {
kb_state.state = KEYBOARD;
goto interpret_scancode;
}
kb_state.len--;
break;
}
}
#if 0
if (acia_stat & ACIA_CTS)
/* cannot happen */;
#endif
if (acia_stat & (ACIA_FE | ACIA_PE)) {
printk("Error in keyboard communication\n");
}
/* handle_scancode() can take a lot of time, so check again if
* some character arrived
*/
goto repeat;
}
/*
* I write to the keyboard without using interrupts, I poll instead.
* This takes for the maximum length string allowed (7) at 7812.5 baud
* 8 data 1 start 1 stop bit: 9.0 ms
* If this takes too long for normal operation, interrupt driven writing
* is the solution. (I made a feeble attempt in that direction but I
* kept it simple for now.)
*/
void ikbd_write(const char *str, int len)
{
u_char acia_stat;
if ((len < 1) || (len > 7))
panic("ikbd: maximum string length exceeded");
while (len) {
acia_stat = acia.key_ctrl;
if (acia_stat & ACIA_TDRE) {
acia.key_data = *str++;
len--;
}
}
}
/* Reset (without touching the clock) */
void ikbd_reset(void)
{
static const char cmd[2] = { 0x80, 0x01 };
ikbd_write(cmd, 2);
/*
* if all's well code 0xF1 is returned, else the break codes of
* all keys making contact
*/
}
/* Set mouse button action */
void ikbd_mouse_button_action(int mode)
{
char cmd[2] = { 0x07, mode };
ikbd_write(cmd, 2);
}
/* Set relative mouse position reporting */
void ikbd_mouse_rel_pos(void)
{
static const char cmd[1] = { 0x08 };
ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_rel_pos);
/* Set absolute mouse position reporting */
void ikbd_mouse_abs_pos(int xmax, int ymax)
{
char cmd[5] = { 0x09, xmax>>8, xmax&0xFF, ymax>>8, ymax&0xFF };
ikbd_write(cmd, 5);
}
/* Set mouse keycode mode */
void ikbd_mouse_kbd_mode(int dx, int dy)
{
char cmd[3] = { 0x0A, dx, dy };
ikbd_write(cmd, 3);
}
/* Set mouse threshold */
void ikbd_mouse_thresh(int x, int y)
{
char cmd[3] = { 0x0B, x, y };
ikbd_write(cmd, 3);
}
EXPORT_SYMBOL(ikbd_mouse_thresh);
/* Set mouse scale */
void ikbd_mouse_scale(int x, int y)
{
char cmd[3] = { 0x0C, x, y };
ikbd_write(cmd, 3);
}
/* Interrogate mouse position */
void ikbd_mouse_pos_get(int *x, int *y)
{
static const char cmd[1] = { 0x0D };
ikbd_write(cmd, 1);
/* wait for returning bytes */
}
/* Load mouse position */
void ikbd_mouse_pos_set(int x, int y)
{
char cmd[6] = { 0x0E, 0x00, x>>8, x&0xFF, y>>8, y&0xFF };
ikbd_write(cmd, 6);
}
/* Set Y=0 at bottom */
void ikbd_mouse_y0_bot(void)
{
static const char cmd[1] = { 0x0F };
ikbd_write(cmd, 1);
}
/* Set Y=0 at top */
void ikbd_mouse_y0_top(void)
{
static const char cmd[1] = { 0x10 };
ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_y0_top);
/* Disable mouse */
void ikbd_mouse_disable(void)
{
static const char cmd[1] = { 0x12 };
ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_disable);
/* Set joystick event reporting */
void ikbd_joystick_event_on(void)
{
static const char cmd[1] = { 0x14 };
ikbd_write(cmd, 1);
}
/* Set joystick interrogation mode */
void ikbd_joystick_event_off(void)
{
static const char cmd[1] = { 0x15 };
ikbd_write(cmd, 1);
}
/* Joystick interrogation */
void ikbd_joystick_get_state(void)
{
static const char cmd[1] = { 0x16 };
ikbd_write(cmd, 1);
}
#if 0
/* This disables all other ikbd activities !!!! */
/* Set joystick monitoring */
void ikbd_joystick_monitor(int rate)
{
static const char cmd[2] = { 0x17, rate };
ikbd_write(cmd, 2);
kb_state.state = JOYSTICK_MONITOR;
}
#endif
/* some joystick routines not in yet (0x18-0x19) */
/* Disable joysticks */
void ikbd_joystick_disable(void)
{
static const char cmd[1] = { 0x1A };
ikbd_write(cmd, 1);
}
/*
* The original code sometimes left the interrupt line of
* the ACIAs low forever. I hope, it is fixed now.
*
* Martin Rogge, 20 Aug 1995
*/
static int atari_keyb_done = 0;
int atari_keyb_init(void)
{
int error;
if (atari_keyb_done)
return 0;
kb_state.state = KEYBOARD;
kb_state.len = 0;
error = request_irq(IRQ_MFP_ACIA, atari_keyboard_interrupt, 0,
"keyboard,mouse,MIDI", atari_keyboard_interrupt);
if (error)
return error;
atari_turnoff_irq(IRQ_MFP_ACIA);
do {
/* reset IKBD ACIA */
acia.key_ctrl = ACIA_RESET |
((atari_switches & ATARI_SWITCH_IKBD) ?
ACIA_RHTID : 0);
(void)acia.key_ctrl;
(void)acia.key_data;
/* reset MIDI ACIA */
acia.mid_ctrl = ACIA_RESET |
((atari_switches & ATARI_SWITCH_MIDI) ?
ACIA_RHTID : 0);
(void)acia.mid_ctrl;
(void)acia.mid_data;
/* divide 500kHz by 64 gives 7812.5 baud */
/* 8 data no parity 1 start 1 stop bit */
/* receive interrupt enabled */
/* RTS low (except if switch selected), transmit interrupt disabled */
acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RIE) |
((atari_switches & ATARI_SWITCH_IKBD) ?
ACIA_RHTID : ACIA_RLTID);
acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S |
((atari_switches & ATARI_SWITCH_MIDI) ?
ACIA_RHTID : 0);
/* make sure the interrupt line is up */
} while ((st_mfp.par_dt_reg & 0x10) == 0);
/* enable ACIA Interrupts */
st_mfp.active_edge &= ~0x10;
atari_turnon_irq(IRQ_MFP_ACIA);
ikbd_self_test = 1;
ikbd_reset();
/* wait for a period of inactivity (here: 0.25s), then assume the IKBD's
* self-test is finished */
self_test_last_rcv = jiffies;
while (time_before(jiffies, self_test_last_rcv + HZ/4))
barrier();
/* if not incremented: no 0xf1 received */
if (ikbd_self_test == 1)
printk(KERN_ERR "WARNING: keyboard self test failed!\n");
ikbd_self_test = 0;
ikbd_mouse_disable();
ikbd_joystick_disable();
#ifdef FIXED_ATARI_JOYSTICK
atari_joystick_init();
#endif
// flag init done
atari_keyb_done = 1;
return 0;
}
EXPORT_SYMBOL_GPL(atari_keyb_init);