sunkbd.c

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/* keyboard.c: Sun keyboard driver.
 *
 * Copyright (C) 1995, 1996, 1997 David S. Miller ([e-mail])
 *
 * Added vuid event generation and /dev/kbd device for SunOS
 * compatibility - Miguel ([e-mail])
 *
 * Added PCI 8042 controller support -DaveM
 * Added Magic SysRq support -MJ
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/sysrq.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>

#include <asm/kbio.h>
#include <asm/vuid_event.h>
#include <asm/bitops.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>

#include <linux/kbd_kern.h>
#include <linux/kbd_diacr.h>
#include <linux/vt_kern.h>

#ifdef CONFIG_PCI
#include <linux/pci.h>
#include <asm/pbm.h>
#include <asm/ebus.h>
#endif

#include "sunkbd.h"

#define SIZE(x) (sizeof(x)/sizeof((x)[0]))

/* Define this one if you are making a new frame buffer driver */
/* it will not block the keyboard */
/* #define CODING_NEW_DRIVER */

/* KBD device number, temporal */
#define KBD_MAJOR 11

#define KBD_REPORT_ERR
#define KBD_REPORT_UNKN

#ifndef KBD_DEFMODE
#define KBD_DEFMODE ((1 << VC_REPEAT) | (1 << VC_META))
#endif

#ifndef KBD_DEFLEDS
/*
 * Some laptops take the 789uiojklm,. keys as number pad when NumLock
 * is on. This seems a good reason to start with NumLock off.
 */
#define KBD_DEFLEDS 0
#endif

#ifndef KBD_DEFLOCK
#define KBD_DEFLOCK 0
#endif

extern void poke_blanked_console(void);
extern void ctrl_alt_del(void);
extern void reset_vc(unsigned int new_console);
extern void scrollback(int);
extern void scrollfront(int);

struct l1a_kbd_state l1a_state;

#ifndef CONFIG_PCI
DECLARE_WAIT_QUEUE_HEAD(keypress_wait);
#endif

int keyboard_wait_for_keypress(struct console *co)
{
	sleep_on(&keypress_wait);
	return 0;
}

static spinlock_t sunkbd_lock = SPIN_LOCK_UNLOCKED;

/*
 * global state includes the following, and various static variables
 * in this module: prev_scancode, shift_state, diacr, npadch, dead_key_next.
 * (last_console is now a global variable)
 */

/* shift state counters.. */
static unsigned char k_down[NR_SHIFT];
/* keyboard key bitmap */
static unsigned long key_down[256/BITS_PER_LONG];

void push_kbd (int scan);
int kbd_redirected;

static int dead_key_next;
/* 
 * In order to retrieve the shift_state (for the mouse server), either
 * the variable must be global, or a new procedure must be created to 
 * return the value. I chose the former way.
 */
#ifndef CONFIG_PCI
/*static*/ int shift_state;
#endif
static int npadch = -1;			/* -1 or number assembled on pad */
static unsigned char diacr;
static char rep;			/* flag telling character repeat */
struct kbd_struct kbd_table[MAX_NR_CONSOLES];
static struct tty_struct **ttytab;
static struct kbd_struct * kbd = kbd_table;
static struct tty_struct * tty;
static int compose_led_on;
static int kbd_delay_ticks = HZ / 5;
static int kbd_rate_ticks = HZ / 20;

void sun_compute_shiftstate(void);

typedef void (*k_hand)(unsigned char value, char up_flag);
typedef void (k_handfn)(unsigned char value, char up_flag);

static k_handfn
	do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
	do_meta, do_ascii, do_lock, do_lowercase, do_ignore;

static k_hand key_handler[16] = {
	do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
	do_meta, do_ascii, do_lock, do_lowercase,
	do_ignore, do_ignore, do_ignore, do_ignore
};

typedef void (*void_fnp)(void);
typedef void (void_fn)(void);

static void_fn do_null, enter, show_ptregs, send_intr, lastcons, caps_toggle,
	num, hold, scroll_forw, scroll_back, boot_it, caps_on, compose,
	SAK, decr_console, incr_console, spawn_console, bare_num;

static void_fnp spec_fn_table[] = {
	do_null,	enter,		show_ptregs,	show_mem,
	show_state,	send_intr,	lastcons,	caps_toggle,
	num,		hold,		scroll_forw,	scroll_back,
	boot_it,	caps_on,	compose,	SAK,
	decr_console,	incr_console,	spawn_console,	bare_num
};

/* maximum values each key_handler can handle */
#ifndef CONFIG_PCI
const int max_vals[] = {
	255, SIZE(func_table) - 1, SIZE(spec_fn_table) - 1, NR_PAD - 1,
	NR_DEAD - 1, 255, 3, NR_SHIFT - 1,
	255, NR_ASCII - 1, NR_LOCK - 1, 255,
	NR_LOCK - 1
};

const int NR_TYPES = SIZE(max_vals);
#endif

static void put_queue(int);
static unsigned char handle_diacr(unsigned char);

/* pt_regs - set by keyboard_interrupt(), used by show_ptregs() */
static struct pt_regs * pt_regs;

#ifdef CONFIG_MAGIC_SYSRQ
unsigned char sun_sysrq_xlate[128] =
	"\0\0\0\0\0\201\202\212\203\213\204\214\205\0\206\0"	/* 0x00 - 0x0f */
	"\207\210\211\0\0\0\0\0\0\0\0\0\0\03312"		/* 0x10 - 0x1f */
	"34567890-=`\177\0=/*"					/* 0x20 - 0x2f */
	"\0\0.\0\0\011qwertyuiop"				/* 0x30 - 0x3f */
	"[]\177\000789-\0\0\0\0\0asd"				/* 0x40 - 0x4f */
	"fghjkl;'\\\015\0154560\0"				/* 0x50 - 0x5f */
	"\0\0\0\0zxcvbnm,./\0\012"				/* 0x60 - 0x6f */
	"123\0\0\0\0\0\0 \0\0\0\0\0\0";				/* 0x70 - 0x7f */
#endif

volatile unsigned char sunkbd_layout;
volatile unsigned char sunkbd_type;
#define SUNKBD_TYPE2        0x02
#define SUNKBD_TYPE3        0x03
#define SUNKBD_TYPE4        0x04

#define SUNKBD_LOUT_TYP4    	0x00
#define SUNKBD_LOUT_TYP5_MASK   0x20

volatile int kbd_reset_pending;
volatile int kbd_layout_pending;

/* commands */
#define SKBDCMD_RESET       0x1
#define SKBDCMD_GLAYOUT     0xf
#define SKBDCMD_BELLON      0x2
#define SKBDCMD_BELLOFF     0x3
#define SKBDCMD_SETLED      0xe
#define SKBDCMD_NOCLICK     0xb
#define SKBDCMD_CLICK       0xa

static unsigned char sunkbd_clickp;

/* The led set commands require sending the SETLED byte then
 * a byte encoding which led's to have set.  Here are the bit
 * values, a bit set = led-on.
 */
#define LED_NLOCK           0x1   /* Num-lock */
#define LED_CMPOSE          0x2   /* Compose */
#define LED_SCRLCK          0x4   /* Scroll-lock */
#define LED_CLOCK           0x8   /* Caps-lock */

/* Special state characters */
#define SKBD_RESET          0xff
#define SKBD_ALLUP          0x7f
#define SKBD_LYOUT          0xfe

/* On the Sparc the keyboard could be one of two things.
 * It could be a real keyboard speaking over one of the
 * channels of the second zs8530 chip (other channel is
 * used by the Sun mouse).  Else we have serial console
 * going, and thus the other zs8530 chip is who we speak
 * to.  Either way, we communicate through the zs8530
 * driver for all our I/O.
 */

#define SUNKBD_UBIT     0x80      /* If set, key went up */
#define SUNKBD_KMASK    0x7f      /* Other bits are the keycode */

#define KEY_LSHIFT      0x81
#define KEY_RSHIFT      0x82
#define KEY_CONTROL     0x83
#define KEY_NILL        0x84
#define KEY_CAPSLOCK    0x85
#define KEY_ALT         0x86
#define KEY_L1          0x87

/* Due to sun_kbd_init() being called before rs_init(), and sun_kbd_init() doing:
 *
 *	tasklet_enable(&keyboard_tasklet);
 *	tasklet_schedule(&keyboard_tasklet);
 *
 * this might well be called before some driver has claimed interest in
 * handling the keyboard input/output. So we need to assign an initial nop.
 */
static void nop_kbd_put_char(unsigned char c) { }
static void (*kbd_put_char)(unsigned char) = nop_kbd_put_char;

/* Must be invoked under sunkbd_lock. */
static inline void send_cmd(unsigned char c)
{
	kbd_put_char(c);
}

/* kbd_bh() calls this to send the SKBDCMD_SETLED to the sun keyboard
 * with the proper bit pattern for the leds to be set.  It basically
 * converts the kbd->ledflagstate values to corresponding sun kbd led
 * bit value.
 */
static inline unsigned char vcleds_to_sunkbd(unsigned char vcleds)
{
	unsigned char retval = 0;

	if(vcleds & (1<<VC_SCROLLOCK))
		retval |= LED_SCRLCK;
	if(vcleds & (1<<VC_NUMLOCK))
		retval |= LED_NLOCK;
	if(vcleds & (1<<VC_CAPSLOCK))
		retval |= LED_CLOCK;
	if(compose_led_on)
		retval |= LED_CMPOSE;
	return retval;
}

/*
 * Translation of escaped scancodes to keycodes.
 * This is now user-settable.
 * The keycodes 1-88,96-111,119 are fairly standard, and
 * should probably not be changed - changing might confuse X.
 * X also interprets scancode 0x5d (KEY_Begin).
 *
 * For 1-88 keycode equals scancode.
 */

#define E0_KPENTER 96
#define E0_RCTRL   97
#define E0_KPSLASH 98
#define E0_PRSCR   99
#define E0_RALT    100
#define E0_BREAK   101  /* (control-pause) */
#define E0_HOME    102
#define E0_UP      103
#define E0_PGUP    104
#define E0_LEFT    105
#define E0_RIGHT   106
#define E0_END     107
#define E0_DOWN    108
#define E0_PGDN    109
#define E0_INS     110
#define E0_DEL     111

#define E1_PAUSE   119

/*
 * The keycodes below are randomly located in 89-95,112-118,120-127.
 * They could be thrown away (and all occurrences below replaced by 0),
 * but that would force many users to use the `setkeycodes' utility, where
 * they needed not before. It does not matter that there are duplicates, as
 * long as no duplication occurs for any single keyboard.
 */
#define SC_LIM 89

#define FOCUS_PF1 85           /* actual code! */
#define FOCUS_PF2 89
#define FOCUS_PF3 90
#define FOCUS_PF4 91
#define FOCUS_PF5 92
#define FOCUS_PF6 93
#define FOCUS_PF7 94
#define FOCUS_PF8 95
#define FOCUS_PF9 120
#define FOCUS_PF10 121
#define FOCUS_PF11 122
#define FOCUS_PF12 123

#define JAP_86     124
/* [e-mail]:
 * The four keys are located over the numeric keypad, and are
 * labelled A1-A4. It's an rc930 keyboard, from
 * Regnecentralen/RC International, Now ICL.
 * Scancodes: 59, 5a, 5b, 5c.
 */
#define RGN1 124
#define RGN2 125
#define RGN3 126
#define RGN4 127

static unsigned char high_keys[128 - SC_LIM] = {
  RGN1, RGN2, RGN3, RGN4, 0, 0, 0,                   /* 0x59-0x5f */
  0, 0, 0, 0, 0, 0, 0, 0,                            /* 0x60-0x67 */
  0, 0, 0, 0, 0, FOCUS_PF11, 0, FOCUS_PF12,          /* 0x68-0x6f */
  0, 0, 0, FOCUS_PF2, FOCUS_PF9, 0, 0, FOCUS_PF3,    /* 0x70-0x77 */
  FOCUS_PF4, FOCUS_PF5, FOCUS_PF6, FOCUS_PF7,        /* 0x78-0x7b */
  FOCUS_PF8, JAP_86, FOCUS_PF10, 0                   /* 0x7c-0x7f */
};

/* BTC */
#define E0_MACRO   112
/* LK450 */
#define E0_F13     113
#define E0_F14     114
#define E0_HELP    115
#define E0_DO      116
#define E0_F17     117
#define E0_KPMINPLUS 118
/*
 * My OmniKey generates e0 4c for  the "OMNI" key and the
 * right alt key does nada. [[e-mail]]
 */
#define E0_OK	124
/*
 * New microsoft keyboard is rumoured to have
 * e0 5b (left window button), e0 5c (right window button),
 * e0 5d (menu button). [or: LBANNER, RBANNER, RMENU]
 * [or: Windows_L, Windows_R, TaskMan]
 */
#define E0_MSLW	125
#define E0_MSRW	126
#define E0_MSTM	127

static unsigned char e0_keys[128] = {
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x00-0x07 */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x08-0x0f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x10-0x17 */
  0, 0, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0,	      /* 0x18-0x1f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x20-0x27 */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x28-0x2f */
  0, 0, 0, 0, 0, E0_KPSLASH, 0, E0_PRSCR,	      /* 0x30-0x37 */
  E0_RALT, 0, 0, 0, 0, E0_F13, E0_F14, E0_HELP,	      /* 0x38-0x3f */
  E0_DO, E0_F17, 0, 0, 0, 0, E0_BREAK, E0_HOME,	      /* 0x40-0x47 */
  E0_UP, E0_PGUP, 0, E0_LEFT, E0_OK, E0_RIGHT, E0_KPMINPLUS, E0_END,/* 0x48-0x4f */
  E0_DOWN, E0_PGDN, E0_INS, E0_DEL, 0, 0, 0, 0,	      /* 0x50-0x57 */
  0, 0, 0, E0_MSLW, E0_MSRW, E0_MSTM, 0, 0,	      /* 0x58-0x5f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x60-0x67 */
  0, 0, 0, 0, 0, 0, 0, E0_MACRO,		      /* 0x68-0x6f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x70-0x77 */
  0, 0, 0, 0, 0, 0, 0, 0			      /* 0x78-0x7f */
};

/* we use this map to determine if a particular key should not be
   autorepeated. We don't autorepeat CONTROL, LSHIFT, CAPS,
   ALT, LMETA, RSHIFT, RMETA, ALTG and COMPOSE */
static unsigned char norepeat_keys[128] = {
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,  /* 0x00-0x0f */
	0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0x10-0x1f */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0x20-0x2f */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0x30-0x3f */
	0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,  /* 0x40-0x4f */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0x50-0x5f */
	0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,  /* 0x60-0x6f */
	0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0,  /* 0x70-0x7f */
};


int sun_setkeycode(unsigned int scancode, unsigned int keycode)
{
	if (scancode < SC_LIM || scancode > 255 || keycode > 127)
	  return -EINVAL;
	if (scancode < 128)
	  high_keys[scancode - SC_LIM] = keycode;
	else
	  e0_keys[scancode - 128] = keycode;
	return 0;
}

int sun_getkeycode(unsigned int scancode)
{
	return
	  (scancode < SC_LIM || scancode > 255) ? -EINVAL :
	  (scancode < 128) ? high_keys[scancode - SC_LIM] :
	    e0_keys[scancode - 128];
}

static void __sunkbd_inchar(unsigned char ch, struct pt_regs *regs);
void sunkbd_inchar(unsigned char ch, struct pt_regs *regs);
static void keyboard_timer (unsigned long ignored);

static struct timer_list
auto_repeat_timer = { function: keyboard_timer };

/* Keeps track of the last pressed key */
static unsigned char last_keycode;

static void
keyboard_timer (unsigned long ignored)
{
	unsigned long flags;

	spin_lock_irqsave(&sunkbd_lock, flags);

	/* Auto repeat: send regs = 0 to indicate autorepeat */
	__sunkbd_inchar (last_keycode, 0);
	del_timer (&auto_repeat_timer);
	if (kbd_rate_ticks) {
		auto_repeat_timer.expires = jiffies + kbd_rate_ticks;
		add_timer (&auto_repeat_timer);
	}

	spin_unlock_irqrestore(&sunkbd_lock, flags);
}

#ifndef CONFIG_PCI
DECLARE_TASKLET_DISABLED(keyboard_tasklet, sun_kbd_bh, 0);
#endif

/* #define SKBD_DEBUG */
/* This is our keyboard 'interrupt' routine.
 * Must run under sunkbd_lock.
 */
static void __sunkbd_inchar(unsigned char ch, struct pt_regs *regs)
{
	unsigned char keycode;
	char up_flag;                          /* 0 or SUNKBD_UBIT */
	char raw_mode;

	if(ch == SKBD_RESET) {
		kbd_reset_pending = 1;
		goto out;
	}
	if(ch == SKBD_LYOUT) {
		kbd_layout_pending = 1;
		goto out;
	}
	if(kbd_reset_pending) {
		sunkbd_type = ch;
		kbd_reset_pending = 0;
		if(ch == SUNKBD_TYPE4)
			send_cmd(SKBDCMD_GLAYOUT);
		goto out;
	} else if(kbd_layout_pending) {
		sunkbd_layout = ch;
		kbd_layout_pending = 0;
		goto out;
	} else if(ch == SKBD_ALLUP) {
		del_timer (&auto_repeat_timer);
		memset(key_down, 0, sizeof(key_down));
		sun_compute_shiftstate();
		goto out;
	}
#ifdef SKBD_DEBUG
	if(ch == 0x7f)
		printk("KBD<ALL KEYS UP>");
	else
		printk("KBD<%x %s>", ch,
		       ((ch&0x80) ? "UP" : "DOWN"));
#endif

	/* Whee, a real character. */
	if(regs) {
		pt_regs = regs;
		last_keycode = keycode = ch;
	} else {
		keycode = ch;
	}
	
	do_poke_blanked_console = 1;
	tasklet_schedule(&console_tasklet);
	add_keyboard_randomness(keycode);

	tty = ttytab? ttytab[fg_console]: NULL;
	if (tty && (!tty->driver_data)) {
		/* This is to workaround ugly bug in tty_io.c, which
                   does not do locking when it should */
		tty = NULL;
	}
	kbd = kbd_table + fg_console;
	if((raw_mode = (kbd->kbdmode == VC_RAW))) {
		if (kbd_redirected == fg_console+1)
			push_kbd (keycode);
		else
			put_queue(keycode);
		/* we do not return yet, because we want to maintain
		 * the key_down array, so that we have the correct
		 * values  when finishing RAW mode or when changing VT's.
		 */
	}
	up_flag = (keycode & SUNKBD_UBIT);  /* The 'up' bit */
	keycode &= SUNKBD_KMASK;            /* all the rest */
	del_timer (&auto_repeat_timer);
	if(up_flag) {
		rep = 0;
		clear_bit(keycode, key_down);
	} else {