keyboard.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,264 行 · 第 1/3 页

void setledstate(struct kbd_struct *kbd, unsigned int led)
{
	if (!(led & ~7)) {
		ledioctl = led;
		kbd->ledmode = LED_SHOW_IOCTL;
	} else
		kbd->ledmode = LED_SHOW_FLAGS;
	set_leds();
}

void register_leds(struct kbd_struct *kbd, unsigned int led,
		   unsigned int *addr, unsigned int mask)
{
	if (led < 3) {
		ledptrs[led].addr = addr;
		ledptrs[led].mask = mask;
		ledptrs[led].valid = 1;
		kbd->ledmode = LED_SHOW_MEM;
	} else
		kbd->ledmode = LED_SHOW_FLAGS;
}

static inline unsigned char getleds(void)
{
	struct kbd_struct *kbd = kbd_table + fg_console;
	unsigned char leds;
	int i;

	if (kbd->ledmode == LED_SHOW_IOCTL)
		return ledioctl;

	leds = kbd->ledflagstate;

	if (kbd->ledmode == LED_SHOW_MEM) {
		for (i = 0; i < 3; i++)
			if (ledptrs[i].valid) {
				if (*ledptrs[i].addr & ledptrs[i].mask)
					leds |= (1 << i);
				else
					leds &= ~(1 << i);
			}
	}
	return leds;
}

/*
 * This routine is the bottom half of the keyboard interrupt
 * routine, and runs with all interrupts enabled. It does
 * console changing, led setting and copy_to_cooked, which can
 * take a reasonably long time.
 *
 * Aside from timing (which isn't really that important for
 * keyboard interrupts as they happen often), using the software
 * interrupt routines for this thing allows us to easily mask
 * this when we don't want any of the above to happen.
 * This allows for easy and efficient race-condition prevention
 * for kbd_refresh_leds => input_event(dev, EV_LED, ...) => ...
 */

static void kbd_bh(unsigned long dummy)
{
	struct list_head * node;
	unsigned char leds = getleds();

	if (leds != ledstate) {
		list_for_each(node,&kbd_handler.h_list) {
			struct input_handle * handle = to_handle_h(node);
			input_event(handle->dev, EV_LED, LED_SCROLLL, !!(leds & 0x01));
			input_event(handle->dev, EV_LED, LED_NUML,    !!(leds & 0x02));
			input_event(handle->dev, EV_LED, LED_CAPSL,   !!(leds & 0x04));
			input_sync(handle->dev);
		}
	}

	ledstate = leds;
}

DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh, 0);

/*
 * This allows a newly plugged keyboard to pick the LED state.
 */
void kbd_refresh_leds(struct input_handle *handle)
{
	unsigned char leds = ledstate;

	tasklet_disable(&keyboard_tasklet);
	if (leds != 0xff) {
		input_event(handle->dev, EV_LED, LED_SCROLLL, !!(leds & 0x01));
		input_event(handle->dev, EV_LED, LED_NUML,    !!(leds & 0x02));
		input_event(handle->dev, EV_LED, LED_CAPSL,   !!(leds & 0x04));
		input_sync(handle->dev);
	}
	tasklet_enable(&keyboard_tasklet);
}

#if defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_ALPHA) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(CONFIG_SPARC32) || defined(CONFIG_SPARC64) || defined(CONFIG_PARISC) || defined(CONFIG_SUPERH)

#define HW_RAW(dev) (test_bit(EV_MSC, dev->evbit) && test_bit(MSC_RAW, dev->mscbit) &&\
			((dev)->id.bustype == BUS_I8042) && ((dev)->id.vendor == 0x0001) && ((dev)->id.product == 0x0001))

static unsigned short x86_keycodes[256] =
	{ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
	 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
	 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
	 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
	 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
	 80, 81, 82, 83, 84,118, 86, 87, 88,115,120,119,121,112,123, 92,
	284,285,309,298,312, 91,327,328,329,331,333,335,336,337,338,339,
	367,288,302,304,350, 89,334,326,267,126,268,269,125,347,348,349,
	360,261,262,263,268,376,100,101,321,316,373,286,289,102,351,355,
	103,104,105,275,287,279,306,106,274,107,294,364,358,363,362,361,
	291,108,381,281,290,272,292,305,280, 99,112,257,258,359,113,114,
	264,117,271,374,379,265,266, 93, 94, 95, 85,259,375,260, 90,116,
	377,109,111,277,278,282,283,295,296,297,299,300,301,293,303,307,
	308,310,313,314,315,317,318,319,320,357,322,323,324,325,276,330,
	332,340,365,342,343,344,345,346,356,270,341,368,369,370,371,372 };

#ifdef CONFIG_MAC_EMUMOUSEBTN
extern int mac_hid_mouse_emulate_buttons(int, int, int);
#endif /* CONFIG_MAC_EMUMOUSEBTN */

#if defined(CONFIG_SPARC32) || defined(CONFIG_SPARC64)
static int sparc_l1_a_state = 0;
extern void sun_do_break(void);
#endif

static int emulate_raw(struct vc_data *vc, unsigned int keycode, 
		       unsigned char up_flag)
{
	if (keycode > 255 || !x86_keycodes[keycode])
		return -1; 

	switch (keycode) {
		case KEY_PAUSE:
			put_queue(vc, 0xe1);
			put_queue(vc, 0x1d | up_flag);
			put_queue(vc, 0x45 | up_flag);
			return 0;
		case KEY_HANGUEL:
			if (!up_flag) put_queue(vc, 0xf1);
			return 0;
		case KEY_HANJA:
			if (!up_flag) put_queue(vc, 0xf2);
			return 0;
	} 

	if (keycode == KEY_SYSRQ && sysrq_alt) {
		put_queue(vc, 0x54 | up_flag);
		return 0;
	}

	if (x86_keycodes[keycode] & 0x100)
		put_queue(vc, 0xe0);

	put_queue(vc, (x86_keycodes[keycode] & 0x7f) | up_flag);

	if (keycode == KEY_SYSRQ) {
		put_queue(vc, 0xe0);
		put_queue(vc, 0x37 | up_flag);
	}

	return 0;
}

#else

#define HW_RAW(dev)	0

#warning "Cannot generate rawmode keyboard for your architecture yet."

static int emulate_raw(struct vc_data *vc, unsigned int keycode, unsigned char up_flag)
{
	if (keycode > 127)
		return -1;

	put_queue(vc, keycode | up_flag);
	return 0;
}
#endif

void kbd_rawcode(unsigned char data)
{
	struct vc_data *vc = vc_cons[fg_console].d;
	kbd = kbd_table + fg_console;
	if (kbd->kbdmode == VC_RAW)
		put_queue(vc, data);
}

void kbd_keycode(unsigned int keycode, int down, int hw_raw, struct pt_regs *regs)
{
	struct vc_data *vc = vc_cons[fg_console].d;
	unsigned short keysym, *key_map;
	unsigned char type, raw_mode;
	struct tty_struct *tty;
	int shift_final;

	if (down != 2)
		add_keyboard_randomness((keycode << 1) ^ down);

	tty = vc->vc_tty;

	if (tty && (!tty->driver_data)) {
		/* No driver data? Strange. Okay we fix it then. */
		tty->driver_data = vc;
	}

	kbd = kbd_table + fg_console;

	if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT)
		sysrq_alt = down;
#if defined(CONFIG_SPARC32) || defined(CONFIG_SPARC64)
	if (keycode == KEY_STOP)
		sparc_l1_a_state = down;
#endif

	rep = (down == 2);

#ifdef CONFIG_MAC_EMUMOUSEBTN
	if (mac_hid_mouse_emulate_buttons(1, keycode, down))
		return;
#endif /* CONFIG_MAC_EMUMOUSEBTN */

	if ((raw_mode = (kbd->kbdmode == VC_RAW)) && !hw_raw)
		if (emulate_raw(vc, keycode, !down << 7))
			if (keycode < BTN_MISC)
				printk(KERN_WARNING "keyboard.c: can't emulate rawmode for keycode %d\n", keycode);

#ifdef CONFIG_MAGIC_SYSRQ	       /* Handle the SysRq Hack */
	if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
		sysrq_down = down;
		return;
	}
	if (sysrq_down && down && !rep) {
		handle_sysrq(kbd_sysrq_xlate[keycode], regs, tty);
		return;
	}
#endif
#if defined(CONFIG_SPARC32) || defined(CONFIG_SPARC64)
	if (keycode == KEY_A && sparc_l1_a_state) {
		sparc_l1_a_state = 0;
		sun_do_break();
	}
#endif

	if (kbd->kbdmode == VC_MEDIUMRAW) {
		/*
		 * This is extended medium raw mode, with keys above 127
		 * encoded as 0, high 7 bits, low 7 bits, with the 0 bearing
		 * the 'up' flag if needed. 0 is reserved, so this shouldn't
		 * interfere with anything else. The two bytes after 0 will
		 * always have the up flag set not to interfere with older
		 * applications. This allows for 16384 different keycodes,
		 * which should be enough.
		 */
		if (keycode < 128) {
			put_queue(vc, keycode | (!down << 7));
		} else {
			put_queue(vc, !down << 7);
			put_queue(vc, (keycode >> 7) | 0x80);
			put_queue(vc, keycode | 0x80);
		}
		raw_mode = 1;
	}

	if (down)
		set_bit(keycode, key_down);
	else
		clear_bit(keycode, key_down);

	if (rep && (!vc_kbd_mode(kbd, VC_REPEAT) || (tty && 
		(!L_ECHO(tty) && tty->driver->chars_in_buffer(tty))))) {
		/*
		 * Don't repeat a key if the input buffers are not empty and the
		 * characters get aren't echoed locally. This makes key repeat 
		 * usable with slow applications and under heavy loads.
		 */
		return;
	}

	shift_final = (shift_state | kbd->slockstate) ^ kbd->lockstate;
	key_map = key_maps[shift_final];

	if (!key_map) {
		compute_shiftstate();
		kbd->slockstate = 0;
		return;
	}

	if (keycode > NR_KEYS)
		return;

	keysym = key_map[keycode];
	type = KTYP(keysym);

	if (type < 0xf0) {
		if (down && !raw_mode) to_utf8(vc, keysym);
		return;
	}

	type -= 0xf0;

	if (raw_mode && type != KT_SPEC && type != KT_SHIFT)
		return;

	if (type == KT_LETTER) {
		type = KT_LATIN;
		if (vc_kbd_led(kbd, VC_CAPSLOCK)) {
			key_map = key_maps[shift_final ^ (1 << KG_SHIFT)];
			if (key_map)
				keysym = key_map[keycode];
		}
	}

	(*k_handler[type])(vc, keysym & 0xff, !down, regs);

	if (type != KT_SLOCK)
		kbd->slockstate = 0;
}

static void kbd_event(struct input_handle *handle, unsigned int event_type, 
		      unsigned int event_code, int value)
{
	if (event_type == EV_MSC && event_code == MSC_RAW && HW_RAW(handle->dev))
		kbd_rawcode(value);
	if (event_type == EV_KEY)
		kbd_keycode(event_code, value, HW_RAW(handle->dev), handle->dev->regs);
	tasklet_schedule(&keyboard_tasklet);
	do_poke_blanked_console = 1;
	schedule_console_callback();
}

static char kbd_name[] = "kbd";

/*
 * When a keyboard (or other input device) is found, the kbd_connect
 * function is called. The function then looks at the device, and if it
 * likes it, it can open it and get events from it. In this (kbd_connect)
 * function, we should decide which VT to bind that keyboard to initially.
 */
static struct input_handle *kbd_connect(struct input_handler *handler, 
					struct input_dev *dev,
					struct input_device_id *id)
{
	struct input_handle *handle;
	int i;

	for (i = KEY_RESERVED; i < BTN_MISC; i++)
		if (test_bit(i, dev->keybit)) break;

	if ((i == BTN_MISC) && !test_bit(EV_SND, dev->evbit)) 
		return NULL;

	if (!(handle = kmalloc(sizeof(struct input_handle), GFP_KERNEL))) 
		return NULL;
	memset(handle, 0, sizeof(struct input_handle));

	handle->dev = dev;
	handle->handler = handler;
	handle->name = kbd_name;

	input_open_device(handle);
	kbd_refresh_leds(handle);

	return handle;
}

static void kbd_disconnect(struct input_handle *handle)
{
	input_close_device(handle);
	kfree(handle);
}

static struct input_device_id kbd_ids[] = {
	{
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
                .evbit = { BIT(EV_KEY) },
        },
	
	{
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
                .evbit = { BIT(EV_SND) },
        },	

	{ },    /* Terminating entry */
};

MODULE_DEVICE_TABLE(input, kbd_ids);

static struct input_handler kbd_handler = {
	.event		= kbd_event,
	.connect	= kbd_connect,
	.disconnect	= kbd_disconnect,
	.name		= "kbd",
	.id_table	= kbd_ids,
};

int __init kbd_init(void)
{
	int i;

        kbd0.ledflagstate = kbd0.default_ledflagstate = KBD_DEFLEDS;
        kbd0.ledmode = LED_SHOW_FLAGS;
        kbd0.lockstate = KBD_DEFLOCK;
        kbd0.slockstate = 0;
        kbd0.modeflags = KBD_DEFMODE;
        kbd0.kbdmode = VC_XLATE;

        for (i = 0 ; i < MAX_NR_CONSOLES ; i++)
                kbd_table[i] = kbd0;

	input_register_handler(&kbd_handler);

	tasklet_enable(&keyboard_tasklet);
	tasklet_schedule(&keyboard_tasklet);

	return 0;
}