path: root/drivers/char/keyboard.c

/*
 * linux/drivers/char/keyboard.c
 *
 * Written for linux by Johan Myreen as a translation from
 * the assembly version by Linus (with diacriticals added)
 *
 * Some additional features added by Christoph Niemann (ChN), March 1993
 *
 * Loadable keymaps by Risto Kankkunen, May 1993
 *
 * Diacriticals redone & other small changes, aeb@cwi.nl, June 1993
 * Added decr/incr_console, dynamic keymaps, Unicode support,
 * dynamic function/string keys, led setting,  Sept 1994
 * `Sticky' modifier keys, 951006.
 *
 * 11-11-96: SAK should now work in the raw mode (Martin Mares)
 *
 * Modified to provide 'generic' keyboard support by Hamish Macdonald
 * Merge with the m68k keyboard driver and split-off of the PC low-level
 * parts by Geert Uytterhoeven, May 1997
 *
 * 27-05-97: Added support for the Magic SysRq Key (Martin Mares)
 * 30-07-98: Dead keys redone, aeb@cwi.nl.
 * 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/slab.h>

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

static void kbd_disconnect(struct input_handle *handle);
extern void ctrl_alt_del(void);

/*
 * Exported functions/variables
 */

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

/*
 * Some laptops take the 789uiojklm,. keys as number pad when NumLock is on.
 * This seems a good reason to start with NumLock off. On HIL keyboards
 * of PARISC machines however there is no NumLock key and everyone expects the keypad
 * to be used for numbers.
 */

#if defined(CONFIG_PARISC) && (defined(CONFIG_KEYBOARD_HIL) || defined(CONFIG_KEYBOARD_HIL_OLD))
#define KBD_DEFLEDS (1 << VC_NUMLOCK)
#else
#define KBD_DEFLEDS 0
#endif

#define KBD_DEFLOCK 0

void compute_shiftstate(void);

/*
 * Handler Tables.
 */

#define K_HANDLERS\
	k_self,		k_fn,		k_spec,		k_pad,\
	k_dead,		k_cons,		k_cur,		k_shift,\
	k_meta,		k_ascii,	k_lock,		k_lowercase,\
	k_slock,	k_dead2,	k_brl,		k_ignore

typedef void (k_handler_fn)(struct vc_data *vc, unsigned char value,
			    char up_flag, struct pt_regs *regs);
static k_handler_fn K_HANDLERS;
static k_handler_fn *k_handler[16] = { K_HANDLERS };

#define FN_HANDLERS\
	fn_null,	fn_enter,	fn_show_ptregs,	fn_show_mem,\
	fn_show_state,	fn_send_intr,	fn_lastcons,	fn_caps_toggle,\
	fn_num,		fn_hold,	fn_scroll_forw,	fn_scroll_back,\
	fn_boot_it,	fn_caps_on,	fn_compose,	fn_SAK,\
	fn_dec_console, fn_inc_console, fn_spawn_con,	fn_bare_num

typedef void (fn_handler_fn)(struct vc_data *vc, struct pt_regs *regs);
static fn_handler_fn FN_HANDLERS;
static fn_handler_fn *fn_handler[] = { FN_HANDLERS };

/*
 * Variables exported for vt_ioctl.c
 */

/* maximum values each key_handler can handle */
const int max_vals[] = {
	255, ARRAY_SIZE(func_table) - 1, ARRAY_SIZE(fn_handler) - 1, NR_PAD - 1,
	NR_DEAD - 1, 255, 3, NR_SHIFT - 1, 255, NR_ASCII - 1, NR_LOCK - 1,
	255, NR_LOCK - 1, 255, NR_BRL - 1
};

const int NR_TYPES = ARRAY_SIZE(max_vals);

struct kbd_struct kbd_table[MAX_NR_CONSOLES];
static struct kbd_struct *kbd = kbd_table;
static struct kbd_struct kbd0;

int spawnpid, spawnsig;

/*
 * Variables exported for vt.c
 */

int shift_state = 0;

/*
 * Internal Data.
 */

static struct input_handler kbd_handler;
static unsigned long key_down[NBITS(KEY_MAX)];		/* keyboard key bitmap */
static unsigned char shift_down[NR_SHIFT];		/* shift state counters.. */
static int dead_key_next;
static int npadch = -1;					/* -1 or number assembled on pad */
static unsigned int diacr;
static char rep;					/* flag telling character repeat */

static unsigned char ledstate = 0xff;			/* undefined */
static unsigned char ledioctl;

static struct ledptr {
	unsigned int *addr;
	unsigned int mask;
	unsigned char valid:1;
} ledptrs[3];

/* Simple translation table for the SysRq keys */

#ifdef CONFIG_MAGIC_SYSRQ
unsigned char kbd_sysrq_xlate[KEY_MAX + 1] =
        "\000\0331234567890-=\177\t"                    /* 0x00 - 0x0f */
        "qwertyuiop[]\r\000as"                          /* 0x10 - 0x1f */
        "dfghjkl;'`\000\\zxcv"                          /* 0x20 - 0x2f */
        "bnm,./\000*\000 \000\201\202\203\204\205"      /* 0x30 - 0x3f */
        "\206\207\210\211\212\000\000789-456+1"         /* 0x40 - 0x4f */
        "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
        "\r\000/";                                      /* 0x60 - 0x6f */
static int sysrq_down;
#endif
static int sysrq_alt;

/*
 * Translation of scancodes to keycodes. We set them on only the first attached
 * keyboard - for per-keyboard setting, /dev/input/event is more useful.
 */
int getkeycode(unsigned int scancode)
{
	struct list_head *node;
	struct input_dev *dev = NULL;

	list_for_each(node, &kbd_handler.h_list) {
		struct input_handle *handle = to_handle_h(node);
		if (handle->dev->keycodesize) {
			dev = handle->dev;
			break;
		}
	}

	if (!dev)
		return -ENODEV;

	if (scancode >= dev->keycodemax)
		return -EINVAL;

	return INPUT_KEYCODE(dev, scancode