intel_mid: Keypad Driver
diff mbox

Message ID 20100708161838.6610.60143.stgit@localhost.localdomain
State Changes Requested
Headers show

Commit Message

Alan Cox July 8, 2010, 4:18 p.m. UTC
None

Patch
diff mbox

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 77ad4ce..950f6d1 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -318,6 +318,13 @@  config KEYBOARD_IMX
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx_keypad.
 
+config KEYBOARD_INTEL_MID
+	tristate "Intel MID keypad support"
+	depends on GPIO_LANGWELL
+	help
+	  Say Y if you want support for Intel MID keypad devices
+	  depends on GPIO_LANGWELL
+
 config KEYBOARD_NEWTON
 	tristate "Newton keyboard"
 	select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index c9c457c..a1f5e9d 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -13,6 +13,7 @@  obj-$(CONFIG_KEYBOARD_ATKBD)		+= atkbd.o
 obj-$(CONFIG_KEYBOARD_BFIN)		+= bf54x-keys.o
 obj-$(CONFIG_KEYBOARD_DAVINCI)		+= davinci_keyscan.o
 obj-$(CONFIG_KEYBOARD_EP93XX)		+= ep93xx_keypad.o
+obj-$(CONFIG_KEYBOARD_INTEL_MID)	+= intel_mid_keypad.o
 obj-$(CONFIG_KEYBOARD_GPIO)		+= gpio_keys.o
 obj-$(CONFIG_KEYBOARD_TCA6416)		+= tca6416-keypad.o
 obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
diff --git a/drivers/input/keyboard/intel_mid_keypad.c b/drivers/input/keyboard/intel_mid_keypad.c
new file mode 100644
index 0000000..b41d50f
--- /dev/null
+++ b/drivers/input/keyboard/intel_mid_keypad.c
@@ -0,0 +1,781 @@ 
+/*
+ * linux/drivers/input/keyboard/intel_mid_keypad.c
+ *
+ * Driver for the matrix keypad controller on MID platform.
+ *
+ * Copyright (c) 2009 Intel Corporation.
+ * Created:	Sep 18, 2008
+ * Updated:	May 14, 2010
+ *
+ * Based on pxa27x_keypad.c by Rodolfo Giometti <giometti@linux.it>
+ * pxa27x_keypad.c is based on a previous implementation by Kevin O'Connor
+ * <kevin_at_keconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
+ * on some suggestions by Nicolas Pitre <nico@cam.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#define DRV_NAME	"mrst_keypad"
+#define DRV_VERSION	"0.0.1"
+#define MRST_KEYPAD_DRIVER_NAME   DRV_NAME " " DRV_VERSION
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+
+/*
+ * Keypad Controller registers
+ */
+#define KPC             0x0000 /* Keypad Control register */
+#define KPDK            0x0004 /* Keypad Direct Key register */
+#define KPREC           0x0008 /* Keypad Rotary Encoder register */
+#define KPMK            0x000C /* Keypad Matrix Key register */
+#define KPAS            0x0010 /* Keypad Automatic Scan register */
+
+/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
+#define KPASMKP0        0x0014
+#define KPASMKP1        0x0018
+#define KPASMKP2        0x001C
+#define KPASMKP3        0x0020
+#define KPKDI           0x0024
+
+/* bit definitions */
+#define KPC_MKRN(n)	((((n) - 1) & 0x7) << 26) /* matrix key row number */
+#define KPC_MKCN(n)	((((n) - 1) & 0x7) << 23) /* matrix key col number */
+#define KPC_DKN(n)	((((n) - 1) & 0x7) << 6)  /* direct key number */
+
+#define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
+#define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
+#define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
+#define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
+
+#define KPC_MS(n)	(0x1 << (13 + (n)))	/* Matrix scan line 'n' */
+#define KPC_MS_ALL      (0xff << 13)
+
+#define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
+#define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
+#define KPC_DK_DEB_SEL	(0x1 <<  9)  /* Direct Keypad Debounce Select */
+#define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
+#define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
+#define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
+#define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
+#define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
+#define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
+
+#define KPDK_DKP        (0x1 << 31)
+#define KPDK_DK(n)	((n) & 0xff)
+
+#define KPREC_OF1       (0x1 << 31)
+#define kPREC_UF1       (0x1 << 30)
+#define KPREC_OF0       (0x1 << 15)
+#define KPREC_UF0       (0x1 << 14)
+
+#define KPREC_RECOUNT0(n)	((n) & 0xff)
+#define KPREC_RECOUNT1(n)	(((n) >> 16) & 0xff)
+
+#define KPMK_MKP        (0x1 << 31)
+#define KPAS_SO         (0x1 << 31)
+#define KPASMKPx_SO     (0x1 << 31)
+
+#define KPAS_MUKP(n)	(((n) >> 26) & 0x1f)
+#define KPAS_RP(n)	(((n) >> 4) & 0xf)
+#define KPAS_CP(n)	((n) & 0xf)
+
+#define KPASMKP_MKC_MASK	(0xff)
+
+#define	KEYPAD_MATRIX_GPIO_IN_PIN	24
+#define	KEYPAD_MATRIX_GPIO_OUT_PIN	32
+#define KEYPAD_DIRECT_GPIO_IN_PIN	40
+
+
+#define keypad_readl(off)	readl(keypad->mmio_base + (off))
+#define keypad_writel(off, v)	writel((v), keypad->mmio_base + (off))
+
+#define MAX_MATRIX_KEY_NUM	(8 * 8)
+#define MAX_DIRECT_KEY_NUM	(4)
+
+#define MAX_MATRIX_KEY_ROWS	(8)
+#define MAX_MATRIX_KEY_COLS	(8)
+#define DEBOUNCE_INTERVAL	100
+
+#define KEY_HALFSHUTTER		KEY_PROG1
+#define KEY_FULLSHUTTER		KEY_CAMERA
+
+static unsigned int mrst_keycode[MAX_MATRIX_KEY_NUM] = {
+	KEY_F, KEY_D, KEY_E, KEY_GRAVE, KEY_C, KEY_R, KEY_4, KEY_V,
+	KEY_NUMLOCK, KEY_LEFTCTRL, KEY_Z, KEY_W, KEY_2, KEY_X, KEY_S, KEY_3,
+	KEY_EQUAL, KEY_N, KEY_H, KEY_U, KEY_7, KEY_M, KEY_J, KEY_8,
+	KEY_6, KEY_5, KEY_APOSTROPHE, KEY_G, KEY_T, KEY_SPACE, KEY_B, KEY_Y,
+	KEY_MINUS, KEY_0, KEY_LEFT, KEY_SEMICOLON, KEY_P, KEY_DOWN, KEY_UP,
+	KEY_BACKSPACE,
+	KEY_L, KEY_K, KEY_I, KEY_SLASH, KEY_COMMA, KEY_O, KEY_9, KEY_DOT,
+	KEY_Q, KEY_TAB, KEY_ESC, KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_1, KEY_FN,
+	KEY_A,
+	0, KEY_RIGHTSHIFT, KEY_ENTER, 0, KEY_RIGHT, 0, 0, 0,
+};
+
+/* NumLk key mapping */
+static unsigned int mrst_keycode_numlck[MAX_MATRIX_KEY_NUM] = {
+	KEY_F, KEY_D, KEY_E, KEY_GRAVE, KEY_C, KEY_R, KEY_4, KEY_V,
+	KEY_NUMLOCK, KEY_LEFTCTRL, KEY_Z, KEY_W, KEY_2, KEY_X, KEY_S, KEY_3,
+	KEY_EQUAL, KEY_N, KEY_H, KEY_KP4, KEY_KP7, KEY_KP0, KEY_KP1, KEY_KP8,
+	KEY_6, KEY_5, KEY_APOSTROPHE, KEY_G, KEY_T, KEY_SPACE, KEY_B, KEY_Y,
+	KEY_MINUS, KEY_KPSLASH, KEY_LEFT, KEY_KPMINUS, KEY_KPASTERISK,
+	KEY_DOWN, KEY_UP, KEY_BACKSPACE,
+	KEY_KP3, KEY_KP2, KEY_KP5, KEY_SLASH, KEY_KPDOT, KEY_KP6, KEY_KP9,
+	KEY_KPPLUS,
+	KEY_Q, KEY_TAB, KEY_ESC, KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_1, KEY_FN,
+	KEY_A,
+	0, KEY_RIGHTSHIFT, KEY_ENTER, 0, KEY_RIGHT, 0, 0, 0,
+};
+
+/* Fn key mapping */
+static unsigned int mrst_keycode_fn[MAX_MATRIX_KEY_NUM] = {
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	KEY_LEFTBRACE, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, KEY_HOME, 0, 0, KEY_PAGEDOWN, KEY_PAGEUP, 0,
+	0, 0, 0, KEY_RIGHTBRACE, KEY_LEFTBRACE, 0, 0, KEY_RIGHTBRACE,
+	0, 0, 0, KEY_LEFTSHIFT, 0, 0, KEY_FN, 0,
+	0, KEY_RIGHTSHIFT, 0, 0, KEY_END, 0, 0, 0,
+};
+
+/* direct key map */
+static unsigned int mrst_direct_keycode[MAX_DIRECT_KEY_NUM] = {
+	KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_HALFSHUTTER, KEY_FULLSHUTTER,
+};
+
+struct mrst_keypad {
+
+	struct input_dev *input_dev;
+	void __iomem *mmio_base;
+
+	unsigned int	matrix_key_rows;
+	unsigned int	matrix_key_cols;
+	int		matrix_key_map_size;
+
+	/* key debounce interval */
+	unsigned int	debounce_interval;
+
+	/* matrix key code map */
+	unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
+
+	/* state row bits of each column scan */
+	uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
+	uint32_t direct_key_state;
+
+	unsigned int direct_key_mask;
+
+	int direct_key_num;
+
+	unsigned int direct_key_map[MAX_DIRECT_KEY_NUM];
+
+	/* rotary encoders 0 */
+	int enable_rotary0;
+	int rotary0_rel_code;
+	int rotary0_up_key;
+	int rotary0_down_key;
+
+	/* rotary encoders 1 */
+	int enable_rotary1;
+	int rotary1_rel_code;
+	int rotary1_up_key;
+	int rotary1_down_key;
+
+	int rotary_rel_code[2];
+	int rotary_up_key[2];
+	int rotary_down_key[2];
+
+	/* Fn key */
+	int fn;
+
+	/* Number Lock key */
+	int numlck;
+
+	/* FIXME:
+	 * Keypad controller likely issues fake interrupts
+	 * when direct key status registers were first initialized
+	 * This value assures this interrupt will not be proceeded.
+	 */
+	int count;
+};
+
+static void mrst_keypad_build_keycode(struct mrst_keypad *keypad)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	unsigned int *key;
+	int i, code;
+
+	keypad->matrix_key_rows = MAX_MATRIX_KEY_ROWS;
+	keypad->matrix_key_cols = MAX_MATRIX_KEY_COLS;
+	keypad->matrix_key_map_size = MAX_MATRIX_KEY_NUM;
+	keypad->debounce_interval = DEBOUNCE_INTERVAL;
+
+	/* three sets of keycode here */
+	if (keypad->fn)
+		memcpy(keypad->matrix_keycodes, mrst_keycode_fn,
+		       sizeof(keypad->matrix_keycodes));
+	else if (keypad->numlck)
+		memcpy(keypad->matrix_keycodes, mrst_keycode_numlck,
+		       sizeof(keypad->matrix_keycodes));
+	else
+		memcpy(keypad->matrix_keycodes, mrst_keycode,
+		       sizeof(keypad->matrix_keycodes));
+
+	memcpy(keypad->direct_key_map, mrst_direct_keycode,
+	       sizeof(keypad->direct_key_map));
+
+	key = &keypad->matrix_keycodes[0];
+	for (i = 0; i < MAX_MATRIX_KEY_NUM; i++, key++) {
+		code = (*key) & 0xffffff;
+		set_bit(code, input_dev->keybit);
+	}
+
+	key = &keypad->direct_key_map[0];
+	for (i = 0; i < MAX_DIRECT_KEY_NUM; i++, key++) {
+		code = (*key) & 0xffffff;
+		set_bit(code, input_dev->keybit);
+	}
+
+	keypad->direct_key_num = MAX_DIRECT_KEY_NUM;
+	keypad->enable_rotary0 = 0;
+	keypad->enable_rotary1 = 0;
+
+}
+
+static inline unsigned int lookup_matrix_keycode(
+		struct mrst_keypad *keypad, int row, int col)
+{
+	return keypad->matrix_keycodes[(row << 3) + col];
+}
+
+static void handle_constant_keypress(struct mrst_keypad *keypad,
+				     int num, int col, int row,
+				     int state)
+{
+	struct input_dev *dev = keypad->input_dev;
+
+	switch (num) {
+	case 0:
+		if (keypad->fn)
+			keypad->fn = 0;
+		/* Manually release special keys (Fn combinations) */
+		if (test_bit(KEY_LEFTBRACE, dev->key))
+			input_report_key(dev, KEY_LEFTBRACE, 0);
+		if (test_bit(KEY_RIGHTBRACE, dev->key))
+			input_report_key(dev, KEY_RIGHTBRACE, 0);
+		if (test_bit(KEY_HOME, dev->key))
+			input_report_key(dev, KEY_RIGHTBRACE, 0);
+		if (test_bit(KEY_END, dev->key))
+			input_report_key(dev, KEY_END, 0);
+		if (test_bit(KEY_PAGEUP, dev->key))
+			input_report_key(dev, KEY_RIGHTBRACE, 0);
+		if (test_bit(KEY_PAGEDOWN, dev->key))
+			input_report_key(dev, KEY_RIGHTBRACE, 0);
+
+		return;
+
+	case 1:
+		/* if Fn pressed */
+		if (col == 6 && row == 6)
+			keypad->fn = 1;
+		/* key '[' */
+		else if ((col == 0 && row == 2) && state) {
+			keypad->fn = 0;
+			set_bit(KEY_EQUAL, dev->key);
+			dev->repeat_key = KEY_EQUAL;
+		}
+		/* key ']' */
+		else if ((col == 3 && row == 5) && state) {
+			keypad->fn = 0;
+			set_bit(KEY_SLASH, dev->key);
+			dev->repeat_key = KEY_SLASH;
+		}
+		/* key '{' */
+		else if ((col == 4 && row == 5) && state) {
+			keypad->fn = 0;
+			set_bit(KEY_COMMA, dev->key);
+			dev->repeat_key = KEY_COMMA;
+		}
+		/* key '}' */
+		else if ((col == 7 && row == 5) && state) {
+			keypad->fn = 0;
+			set_bit(KEY_DOT, dev->key);
+			dev->repeat_key = KEY_DOT;
+		}
+
+		return;
+	default:
+		;
+	}
+}
+
+static void mrst_keypad_scan_matrix(struct mrst_keypad *keypad)
+{
+	int row, col, num_keys_pressed = 0;
+	uint32_t new_state[MAX_MATRIX_KEY_COLS];
+	uint32_t kpas = keypad_readl(KPAS);
+	int status;
+
+	num_keys_pressed = KPAS_MUKP(kpas);
+
+	memset(new_state, 0, sizeof(new_state));
+
+	if (num_keys_pressed == 0) {
+		status = keypad->matrix_key_state[0] & (1 << 0);
+		handle_constant_keypress(keypad, num_keys_pressed, 0, 0,
+					 status);
+
+		goto scan;
+	}
+
+	if (num_keys_pressed == 1) {
+		col = KPAS_CP(kpas);
+		row = KPAS_RP(kpas);
+
+		/* if invalid row/col, treat as no key pressed */
+		if (col < MAX_MATRIX_KEY_COLS &&
+		    row < MAX_MATRIX_KEY_ROWS) {
+
+			/* if NumLk pressed */
+			if (col == 0 && row == 1)
+				keypad->numlck = !keypad->numlck;
+
+			status = keypad->matrix_key_state[col] & (1 << row);
+			handle_constant_keypress(keypad, num_keys_pressed, col,
+						 row, status);
+
+			new_state[col] = (1 << row);
+		}
+
+		goto scan;
+	}
+
+	if (num_keys_pressed > 1) {
+		uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
+		uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
+		uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
+		uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
+
+		new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
+		new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
+		new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
+		new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
+		new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
+		new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
+		new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
+		new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
+
+		/* if Fn is pressed, all SHIFT is ignored, except when {
+		 * or } is pressed */
+		if (new_state[6] & 0x40) {
+			keypad->fn = 1;
+			new_state[3] &= ~0x40;
+			new_state[1] &= ~0x80;
+		}
+
+		if (keypad->fn == 1) {
+			/* if { or } pressed */
+			if ((new_state[4] & 0x20) || (new_state[7] & 0x20)) {
+				/* as if LEFTSHIFT is pressed */
+				new_state[3] |= 0x40;
+				/* as if Fn not pressed */
+				new_state[6] &= ~0x40;
+			}
+			/* if [ or ] pressed */
+			if ((new_state[0] & 0x04) || (new_state[3] & 0x20))
+				/* as if Fn not pressed */
+				new_state[6] &= ~0x40;
+		}
+	}
+
+
+scan:
+	/* re-build keycode */
+	mrst_keypad_build_keycode(keypad);
+
+	for (col = 0; col < keypad->matrix_key_cols; col++) {
+		uint32_t bits_changed;
+
+		bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
+		if (bits_changed == 0)
+			continue;
+
+		for (row = 0; row < keypad->matrix_key_rows; row++) {
+			if ((bits_changed & (1 << row)) == 0)
+				continue;
+
+			input_report_key(keypad->input_dev,
+				lookup_matrix_keycode(keypad, row, col),
+				new_state[col] & (1 << row));
+		}
+	}
+	input_sync(keypad->input_dev);
+	memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
+}
+
+#define DEFAULT_KPREC	(0x007f007f)
+
+static inline int rotary_delta(uint32_t kprec)
+{
+	if (kprec & KPREC_OF0)
+		return (kprec & 0xff) + 0x7f;
+	else if (kprec & KPREC_UF0)
+		return (kprec & 0xff) - 0x7f - 0xff;
+	else
+		return (kprec & 0xff) - 0x7f;
+}
+
+static void report_rotary_event(struct mrst_keypad *keypad, int r, int delta)
+{
+	struct input_dev *dev = keypad->input_dev;
+
+	if (delta == 0)
+		return;
+
+	if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
+		int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
+					    keypad->rotary_down_key[r];
+
+		/* simulate a press-n-release */
+		input_report_key(dev, keycode, 1);
+		input_sync(dev);
+		input_report_key(dev, keycode, 0);
+		input_sync(dev);
+	} else {
+		input_report_rel(dev, keypad->rotary_rel_code[r], delta);
+		input_sync(dev);
+	}
+}
+
+static void mrst_keypad_scan_rotary(struct mrst_keypad *keypad)
+{
+	unsigned int kprec;
+
+	/* read and reset to default count value */
+	kprec = keypad_readl(KPREC);
+	keypad_writel(KPREC, DEFAULT_KPREC);
+
+	if (keypad->enable_rotary0)
+		report_rotary_event(keypad, 0, rotary_delta(kprec));
+
+	if (keypad->enable_rotary1)
+		report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
+}
+
+static void mrst_keypad_scan_direct(struct mrst_keypad *keypad)
+{
+	unsigned int new_state;
+	uint32_t kpdk, bits_changed;
+	int i;
+
+	kpdk = keypad_readl(KPDK);
+
+	if (keypad->enable_rotary0 || keypad->enable_rotary1)
+		mrst_keypad_scan_rotary(keypad);
+
+	if ((keypad->direct_key_map == NULL) || (++keypad->count == 1)) {
+		keypad->direct_key_state = 0;
+		return;
+	}
+
+	new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
+	new_state = ~new_state;
+	bits_changed = keypad->direct_key_state ^ new_state;
+
+	if (bits_changed == 0)
+		return;
+
+	for (i = 0; i < keypad->direct_key_num; i++) {
+		if (bits_changed & (1 << i)) {
+			input_report_key(keypad->input_dev,
+					 keypad->direct_key_map[i],
+					 (new_state & (1 << i)));
+		}
+	}
+	input_sync(keypad->input_dev);
+	keypad->direct_key_state = new_state;
+
+}
+
+static irqreturn_t mrst_keypad_irq_handler(int irq, void *dev_id)
+{
+	struct mrst_keypad *keypad = dev_id;
+	unsigned long kpc = keypad_readl(KPC);
+
+	if (kpc & KPC_DI)
+		mrst_keypad_scan_direct(keypad);
+
+	if (kpc & KPC_MI)
+		mrst_keypad_scan_matrix(keypad);
+
+	return IRQ_HANDLED;
+}
+
+static int mrst_keypad_gpio_init(void)
+{
+	int i, err, cnt = 0;
+	int pins = KEYPAD_MATRIX_GPIO_IN_PIN + MAX_MATRIX_KEY_ROWS +
+	    MAX_MATRIX_KEY_COLS + MAX_DIRECT_KEY_NUM;
+
+	/* explicitely tell which pins have been occupied... */
+	for (i = KEYPAD_MATRIX_GPIO_IN_PIN; i < pins; i++, cnt++) {
+		err = gpio_request(i, NULL);
+		if (err) {
+			printk(KERN_ERR "GPIO pin %d failed to request.\n", i);
+			goto err_request;
+		}
+	}
+
+	for (i = 0; i < MAX_MATRIX_KEY_ROWS; i++)
+		gpio_direction_input(KEYPAD_MATRIX_GPIO_IN_PIN + i);
+
+	for (i = 0; i < MAX_MATRIX_KEY_COLS; i++)
+		/* __gpio_set_value(KEYPAD_GPIO_OUT_PIN + i, 1); */
+		/* set action is executed in gpio_direction_output() */
+		gpio_direction_output(KEYPAD_MATRIX_GPIO_OUT_PIN + i, 1);
+
+	for (i = 0; i < MAX_DIRECT_KEY_NUM; i++)
+		gpio_direction_input(KEYPAD_DIRECT_GPIO_IN_PIN + i);
+
+	return 0;
+
+err_request:
+	/* free requested pins... */
+	for (i = KEYPAD_MATRIX_GPIO_IN_PIN + cnt - 1;
+	     i >= KEYPAD_MATRIX_GPIO_IN_PIN; i--)
+		gpio_free(i);
+	return err;
+}
+
+static void mrst_keypad_config(struct mrst_keypad *keypad)
+{
+	unsigned int mask = 0, direct_key_num = 0;
+	unsigned long kpc = 0;
+
+	/* enable matrix keys with automatic scan */
+	if (keypad->matrix_key_rows && keypad->matrix_key_cols) {
+		kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
+		kpc |= KPC_MKRN(keypad->matrix_key_rows) |
+		       KPC_MKCN(keypad->matrix_key_cols);
+	}
+
+	/* enable rotary key, debounce interval same as direct keys */
+	if (keypad->enable_rotary0) {
+		mask |= 0x03;
+		direct_key_num = 2;
+		kpc |= KPC_REE0;
+	}
+
+	if (keypad->enable_rotary1) {
+		mask |= 0x0c;
+		direct_key_num = 4;
+		kpc |= KPC_REE1;
+	}
+
+	if (keypad->direct_key_num > direct_key_num)
+		direct_key_num = keypad->direct_key_num;
+
+	keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
+
+	/* enable direct key */
+	if (direct_key_num)
+		kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
+
+	keypad_writel(KPC, kpc);
+	keypad_writel(KPREC, DEFAULT_KPREC);
+	keypad_writel(KPKDI, keypad->debounce_interval);
+}
+
+static int mrst_keypad_open(struct input_dev *dev)
+{
+	struct mrst_keypad *keypad = input_get_drvdata(dev);
+	int err;
+
+	err = mrst_keypad_gpio_init();
+	if (err)
+		return err;
+	mrst_keypad_config(keypad);
+
+	return 0;
+}
+
+static void mrst_keypad_close(struct input_dev *dev)
+{
+	int pins = KEYPAD_MATRIX_GPIO_IN_PIN + MAX_MATRIX_KEY_ROWS +
+	    MAX_MATRIX_KEY_COLS + MAX_DIRECT_KEY_NUM;
+
+	int i;
+	/* free occupied pins */
+	for (i = KEYPAD_MATRIX_GPIO_IN_PIN; i < pins; i++)
+		gpio_free(i);
+}
+
+static int __devinit mrst_keypad_probe(struct pci_dev *pdev,
+			const struct pci_device_id *ent)
+{
+	struct mrst_keypad *keypad;
+	struct input_dev *input_dev;
+	int error;
+
+#ifndef MODULE
+	printk(KERN_INFO MRST_KEYPAD_DRIVER_NAME "\n");
+#endif
+
+	keypad = kzalloc(sizeof(struct mrst_keypad), GFP_KERNEL);
+	if (keypad == NULL) {
+		dev_err(&pdev->dev, "failed to allocate driver data\n");
+		return -ENOMEM;
+	}
+
+	error = pci_enable_device(pdev);
+	if (error || (pdev->irq < 0)) {
+		dev_err(&pdev->dev, "failed to enable device/get irq\n");
+		error = -ENXIO;
+		goto failed_free;
+	}
+
+	error = pci_request_regions(pdev, DRV_NAME);
+	if (error) {
+		dev_err(&pdev->dev, "failed to request I/O memory\n");
+		goto failed_free;
+	}
+
+	keypad->mmio_base = ioremap(pci_resource_start(pdev, 0),
+		pci_resource_len(pdev, 0));
+	if (keypad->mmio_base == NULL) {
+		dev_err(&pdev->dev, "failed to remap I/O memory\n");
+		error = -ENXIO;
+		goto failed_free_mem;
+	}
+
+	/* Create and register the input driver. */
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		dev_err(&pdev->dev, "failed to allocate input device\n");
+		error = -ENOMEM;
+		goto failed_free_io;
+	}
+
+	input_dev->name = pci_name(pdev);
+	input_dev->id.bustype = BUS_PCI;
+	input_dev->open = mrst_keypad_open;
+	input_dev->close = mrst_keypad_close;
+	input_dev->dev.parent = &pdev->dev;
+
+	input_dev->keycode = keypad->matrix_keycodes;
+	input_dev->keycodesize = sizeof(unsigned int);
+	input_dev->keycodemax = ARRAY_SIZE(mrst_keycode);
+
+	keypad->input_dev = input_dev;
+	keypad->fn = 0;
+	keypad->numlck = 0;
+	/*FIXME*/keypad->count = 0;
+	input_set_drvdata(input_dev, keypad);
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
+		BIT_MASK(EV_REL);
+
+	mrst_keypad_build_keycode(keypad);
+	pci_set_drvdata(pdev, keypad);
+
+	error = request_irq(pdev->irq, mrst_keypad_irq_handler, IRQF_SHARED,
+		pci_name(pdev), keypad);
+	if (error) {
+		dev_err(&pdev->dev, "failed to request IRQ\n");
+		goto failed_free_dev;
+	}
+
+	/* Register the input device */
+	error = input_register_device(input_dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		goto failed_free_irq;
+	}
+
+	printk(KERN_INFO "*** keypad driver load successfully ***\n");
+	return 0;
+
+failed_free_irq:
+	free_irq(pdev->irq, keypad);
+	pci_set_drvdata(pdev, NULL);
+failed_free_dev:
+	input_free_device(input_dev);
+failed_free_io:
+	iounmap(keypad->mmio_base);
+failed_free_mem:
+	pci_release_regions(pdev);
+failed_free:
+	kfree(keypad);
+	return error;
+}
+
+static void __devexit mrst_keypad_remove(struct pci_dev *pdev)
+{
+	struct mrst_keypad *keypad = pci_get_drvdata(pdev);
+	int i;
+	int pins = KEYPAD_MATRIX_GPIO_IN_PIN + MAX_MATRIX_KEY_ROWS +
+	    MAX_MATRIX_KEY_COLS + MAX_DIRECT_KEY_NUM;
+
+	for (i = pins - 1; i > KEYPAD_MATRIX_GPIO_IN_PIN; i--)
+		gpio_free(i);
+
+	free_irq(pdev->irq, keypad);
+	input_unregister_device(keypad->input_dev);
+	iounmap(keypad->mmio_base);
+	pci_release_regions(pdev);
+	pci_set_drvdata(pdev, NULL);
+	kfree(keypad);
+}
+
+static struct pci_device_id keypad_pci_tbl[] = {
+	{0x8086, 0x0805, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{0,}
+};
+MODULE_DEVICE_TABLE(pci, keypad_pci_tbl);
+
+static struct pci_driver mrst_keypad_driver = {
+	.name		= DRV_NAME,
+	.id_table	= keypad_pci_tbl,
+	.probe		= mrst_keypad_probe,
+	.remove		= __devexit_p(mrst_keypad_remove),
+#ifdef CONFIG_PM
+	.suspend	= NULL,
+	.resume		= NULL,
+#endif /* CONFIG_PM */
+};
+
+static int __init mrst_keypad_init(void)
+{
+	return pci_register_driver(&mrst_keypad_driver);
+}
+
+static void __exit mrst_keypad_exit(void)
+{
+	pci_unregister_driver(&mrst_keypad_driver);
+}
+
+module_init(mrst_keypad_init);
+module_exit(mrst_keypad_exit);
+
+MODULE_DESCRIPTION("MRST Keypad Controller Driver");
+MODULE_LICENSE("GPL v2");