drivers/input/keyboard/corgikbd.c - linux - Git at Google

 /*
  *  Keyboard driver for Sharp Corgi models (SL-C7xx)
  *
  *  Copyright (c) 2004-2005 Richard Purdie
  *
  *  Based on xtkbd.c/locomkbd.c
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  *
  */

 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #include <asm/arch/corgi.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/pxa-regs.h>
 #include <asm/hardware/scoop.h>

 #define KB_ROWS				8
 #define KB_COLS				12
 #define KB_ROWMASK(r)		(1 << (r))
 #define SCANCODE(r,c)		( ((r)<<4) + (c) + 1 )
 /* zero code, 124 scancodes */
 #define	NR_SCANCODES		( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )

 #define SCAN_INTERVAL		(50) /* ms */
 #define HINGE_SCAN_INTERVAL	(250) /* ms */

 #define CORGI_KEY_CALENDER	KEY_F1
 #define CORGI_KEY_ADDRESS	KEY_F2
 #define CORGI_KEY_FN		KEY_F3
 #define CORGI_KEY_CANCEL	KEY_F4
 #define CORGI_KEY_OFF		KEY_SUSPEND
 #define CORGI_KEY_EXOK		KEY_F5
 #define CORGI_KEY_EXCANCEL	KEY_F6
 #define CORGI_KEY_EXJOGDOWN	KEY_F7
 #define CORGI_KEY_EXJOGUP	KEY_F8
 #define CORGI_KEY_JAP1		KEY_LEFTCTRL
 #define CORGI_KEY_JAP2		KEY_LEFTALT
 #define CORGI_KEY_MAIL		KEY_F10
 #define CORGI_KEY_OK		KEY_F11
 #define CORGI_KEY_MENU		KEY_F12

 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
 	0,                                                                                                                /* 0 */
 	0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, 	                      /* 1-16 */
 	0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0,                                   /* 17-32 */
 	KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0,                                 /* 33-48 */
 	CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,         /* 49-64 */
 	CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 	  /* 65-80 */
 	CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0,            /* 81-96 */
 	KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0,  /* 97-112 */
 	CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0,   /* 113-124 */
 };


 struct corgikbd {
 	unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
 	struct input_dev *input;

 	spinlock_t lock;
 	struct timer_list timer;
 	struct timer_list htimer;

 	unsigned int suspended;
 	unsigned long suspend_jiffies;
 };

 #define KB_DISCHARGE_DELAY	10
 #define KB_ACTIVATE_DELAY	10

 /* Helper functions for reading the keyboard matrix
  * Note: We should really be using pxa_gpio_mode to alter GPDR but it
  *       requires a function call per GPIO bit which is excessive
  *       when we need to access 12 bits at once multiple times.
  * These functions must be called within local_irq_save()/local_irq_restore()
  * or similar.
  */
 static inline void corgikbd_discharge_all(void)
 {
 	/* STROBE All HiZ */
 	GPCR2  = CORGI_GPIO_ALL_STROBE_BIT;
 	GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
 }

 static inline void corgikbd_activate_all(void)
 {
 	/* STROBE ALL -> High */
 	GPSR2  = CORGI_GPIO_ALL_STROBE_BIT;
 	GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;

 	udelay(KB_DISCHARGE_DELAY);

 	/* Clear any interrupts we may have triggered when altering the GPIO lines */
 	GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
 	GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
 }

 static inline void corgikbd_activate_col(int col)
 {
 	/* STROBE col -> High, not col -> HiZ */
 	GPSR2 = CORGI_GPIO_STROBE_BIT(col);
 	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 }

 static inline void corgikbd_reset_col(int col)
 {
 	/* STROBE col -> Low */
 	GPCR2 = CORGI_GPIO_STROBE_BIT(col);
 	/* STROBE col -> out, not col -> HiZ */
 	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 }

 #define GET_ROWS_STATUS(c)	(((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))

 /*
  * The corgi keyboard only generates interrupts when a key is pressed.
  * When a key is pressed, we enable a timer which then scans the
  * keyboard to detect when the key is released.
  */

 /* Scan the hardware keyboard and push any changes up through the input layer */
 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data)
 {
 	unsigned int row, col, rowd;
 	unsigned long flags;
 	unsigned int num_pressed;

 	if (corgikbd_data->suspended)
 		return;

 	spin_lock_irqsave(&corgikbd_data->lock, flags);

 	num_pressed = 0;
 	for (col = 0; col < KB_COLS; col++) {
 		/*
 		 * Discharge the output driver capacitatance
 		 * in the keyboard matrix. (Yes it is significant..)
 		 */

 		corgikbd_discharge_all();
 		udelay(KB_DISCHARGE_DELAY);

 		corgikbd_activate_col(col);
 		udelay(KB_ACTIVATE_DELAY);

 		rowd = GET_ROWS_STATUS(col);
 		for (row = 0; row < KB_ROWS; row++) {
 			unsigned int scancode, pressed;

 			scancode = SCANCODE(row, col);
 			pressed = rowd & KB_ROWMASK(row);

 			input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);

 			if (pressed)
 				num_pressed++;

 			if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
 					&& time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
 				input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
 				corgikbd_data->suspend_jiffies=jiffies;
 			}
 		}
 		corgikbd_reset_col(col);
 	}

 	corgikbd_activate_all();

 	input_sync(corgikbd_data->input);

 	/* if any keys are pressed, enable the timer */
 	if (num_pressed)
 		mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));

 	spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 }

 /*
  * corgi keyboard interrupt handler.
  */
 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id)
 {
 	struct corgikbd *corgikbd_data = dev_id;

 	if (!timer_pending(&corgikbd_data->timer)) {
 		/** wait chattering delay **/
 		udelay(20);
 		corgikbd_scankeyboard(corgikbd_data);
 	}

 	return IRQ_HANDLED;
 }

 /*
  * corgi timer checking for released keys
  */
 static void corgikbd_timer_callback(unsigned long data)
 {
 	struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 	corgikbd_scankeyboard(corgikbd_data, NULL);
 }

 /*
  * The hinge switches generate no interrupt so they need to be
  * monitored by a timer.
  *
  * We debounce the switches and pass them to the input system.
  *
  *  gprr == 0x00 - Keyboard with Landscape Screen
  *          0x08 - No Keyboard with Portrait Screen
  *          0x0c - Keyboard and Screen Closed
  */

 #define READ_GPIO_BIT(x)    (GPLR(x) & GPIO_bit(x))
 #define HINGE_STABLE_COUNT 2
 static int sharpsl_hinge_state;
 static int hinge_count;

 static void corgikbd_hinge_timer(unsigned long data)
 {
 	struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 	unsigned long gprr;
 	unsigned long flags;

 	gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
 	gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
 	if (gprr != sharpsl_hinge_state) {
 		hinge_count = 0;
 		sharpsl_hinge_state = gprr;
 	} else if (hinge_count < HINGE_STABLE_COUNT) {
 		hinge_count++;
 		if (hinge_count >= HINGE_STABLE_COUNT) {
 			spin_lock_irqsave(&corgikbd_data->lock, flags);

 			input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
 			input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
 			input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
 			input_sync(corgikbd_data->input);

 			spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 		}
 	}
 	mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 }

 #ifdef CONFIG_PM
 static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
 {
 	int i;
 	struct corgikbd *corgikbd = platform_get_drvdata(dev);

 	corgikbd->suspended = 1;
 	/* strobe 0 is the power key so this can't be made an input for
 	   powersaving therefore i = 1 */
 	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN);

 	return 0;
 }

 static int corgikbd_resume(struct platform_device *dev)
 {
 	int i;
 	struct corgikbd *corgikbd = platform_get_drvdata(dev);

 	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);

 	/* Upon resume, ignore the suspend key for a short while */
 	corgikbd->suspend_jiffies=jiffies;
 	corgikbd->suspended = 0;

 	return 0;
 }
 #else
 #define corgikbd_suspend	NULL
 #define corgikbd_resume		NULL
 #endif

 static int __init corgikbd_probe(struct platform_device *pdev)
 {
 	struct corgikbd *corgikbd;
 	struct input_dev *input_dev;
 	int i;

 	corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!corgikbd || !input_dev) {
 		kfree(corgikbd);
 		input_free_device(input_dev);
 		return -ENOMEM;
 	}

 	platform_set_drvdata(pdev, corgikbd);

 	corgikbd->input = input_dev;
 	spin_lock_init(&corgikbd->lock);

 	/* Init Keyboard rescan timer */
 	init_timer(&corgikbd->timer);
 	corgikbd->timer.function = corgikbd_timer_callback;
 	corgikbd->timer.data = (unsigned long) corgikbd;

 	/* Init Hinge Timer */
 	init_timer(&corgikbd->htimer);
 	corgikbd->htimer.function = corgikbd_hinge_timer;
 	corgikbd->htimer.data = (unsigned long) corgikbd;

 	corgikbd->suspend_jiffies=jiffies;

 	memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));

 	input_dev->name = "Corgi Keyboard";
 	input_dev->phys = "corgikbd/input0";
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0100;
 	input_dev->cdev.dev = &pdev->dev;
 	input_dev->private = corgikbd;

 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);
 	input_dev->keycode = corgikbd->keycode;
 	input_dev->keycodesize = sizeof(unsigned char);
 	input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);

 	for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
 		set_bit(corgikbd->keycode[i], input_dev->keybit);
 	clear_bit(0, input_dev->keybit);
 	set_bit(SW_LID, input_dev->swbit);
 	set_bit(SW_TABLET_MODE, input_dev->swbit);
 	set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);

 	input_register_device(corgikbd->input);

 	mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

 	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
 		pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
 		if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
 				IRQF_DISABLED | IRQF_TRIGGER_RISING,
 				"corgikbd", corgikbd))
 			printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
 	}

 	/* Set Strobe lines as outputs - set high */
 	for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);

 	/* Setup the headphone jack as an input */
 	pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN);

 	return 0;
 }

 static int corgikbd_remove(struct platform_device *pdev)
 {
 	int i;
 	struct corgikbd *corgikbd = platform_get_drvdata(pdev);

 	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
 		free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);

 	del_timer_sync(&corgikbd->htimer);
 	del_timer_sync(&corgikbd->timer);

 	input_unregister_device(corgikbd->input);

 	kfree(corgikbd);

 	return 0;
 }

 static struct platform_driver corgikbd_driver = {
 	.probe		= corgikbd_probe,
 	.remove		= corgikbd_remove,
 	.suspend	= corgikbd_suspend,
 	.resume		= corgikbd_resume,
 	.driver		= {
 		.name	= "corgi-keyboard",
 	},
 };

 static int __devinit corgikbd_init(void)
 {
 	return platform_driver_register(&corgikbd_driver);
 }

 static void __exit corgikbd_exit(void)
 {
 	platform_driver_unregister(&corgikbd_driver);
 }

 module_init(corgikbd_init);
 module_exit(corgikbd_exit);

 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 MODULE_DESCRIPTION("Corgi Keyboard Driver");
 MODULE_LICENSE("GPLv2");
	/*
	* Keyboard driver for Sharp Corgi models (SL-C7xx)
	*
	* Copyright (c) 2004-2005 Richard Purdie
	*
	* Based on xtkbd.c/locomkbd.c
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/jiffies.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#include <asm/arch/corgi.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/pxa-regs.h>
	#include <asm/hardware/scoop.h>

	#define KB_ROWS 8
	#define KB_COLS 12
	#define KB_ROWMASK(r) (1 << (r))
	#define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
	/* zero code, 124 scancodes */
	#define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )

	#define SCAN_INTERVAL (50) /* ms */
	#define HINGE_SCAN_INTERVAL (250) /* ms */

	#define CORGI_KEY_CALENDER KEY_F1
	#define CORGI_KEY_ADDRESS KEY_F2
	#define CORGI_KEY_FN KEY_F3
	#define CORGI_KEY_CANCEL KEY_F4
	#define CORGI_KEY_OFF KEY_SUSPEND
	#define CORGI_KEY_EXOK KEY_F5
	#define CORGI_KEY_EXCANCEL KEY_F6
	#define CORGI_KEY_EXJOGDOWN KEY_F7
	#define CORGI_KEY_EXJOGUP KEY_F8
	#define CORGI_KEY_JAP1 KEY_LEFTCTRL
	#define CORGI_KEY_JAP2 KEY_LEFTALT
	#define CORGI_KEY_MAIL KEY_F10
	#define CORGI_KEY_OK KEY_F11
	#define CORGI_KEY_MENU KEY_F12

	static unsigned char corgikbd_keycode[NR_SCANCODES] = {
	0, /* 0 */
	0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, /* 1-16 */
	0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0, /* 17-32 */
	KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0, /* 33-48 */
	CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0, /* 49-64 */
	CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, /* 65-80 */
	CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0, /* 81-96 */
	KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0, /* 97-112 */
	CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
	};


	struct corgikbd {
	unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
	struct input_dev *input;

	spinlock_t lock;
	struct timer_list timer;
	struct timer_list htimer;

	unsigned int suspended;
	unsigned long suspend_jiffies;
	};

	#define KB_DISCHARGE_DELAY 10
	#define KB_ACTIVATE_DELAY 10

	/* Helper functions for reading the keyboard matrix
	* Note: We should really be using pxa_gpio_mode to alter GPDR but it
	* requires a function call per GPIO bit which is excessive
	* when we need to access 12 bits at once multiple times.
	* These functions must be called within local_irq_save()/local_irq_restore()
	* or similar.
	*/
	static inline void corgikbd_discharge_all(void)
	{
	/* STROBE All HiZ */
	GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
	GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
	}

	static inline void corgikbd_activate_all(void)
	{
	/* STROBE ALL -> High */
	GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
	GPDR2 \|= CORGI_GPIO_ALL_STROBE_BIT;

	udelay(KB_DISCHARGE_DELAY);

	/* Clear any interrupts we may have triggered when altering the GPIO lines */
	GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
	GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
	}

	static inline void corgikbd_activate_col(int col)
	{
	/* STROBE col -> High, not col -> HiZ */
	GPSR2 = CORGI_GPIO_STROBE_BIT(col);
	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) \| CORGI_GPIO_STROBE_BIT(col);
	}

	static inline void corgikbd_reset_col(int col)
	{
	/* STROBE col -> Low */
	GPCR2 = CORGI_GPIO_STROBE_BIT(col);
	/* STROBE col -> out, not col -> HiZ */
	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) \| CORGI_GPIO_STROBE_BIT(col);
	}

	#define GET_ROWS_STATUS(c) (((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) \| ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))

	/*
	* The corgi keyboard only generates interrupts when a key is pressed.
	* When a key is pressed, we enable a timer which then scans the
	* keyboard to detect when the key is released.
	*/

	/* Scan the hardware keyboard and push any changes up through the input layer */
	static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data)
	{
	unsigned int row, col, rowd;
	unsigned long flags;
	unsigned int num_pressed;

	if (corgikbd_data->suspended)
	return;

	spin_lock_irqsave(&corgikbd_data->lock, flags);

	num_pressed = 0;
	for (col = 0; col < KB_COLS; col++) {
	/*
	* Discharge the output driver capacitatance
	* in the keyboard matrix. (Yes it is significant..)
	*/

	corgikbd_discharge_all();
	udelay(KB_DISCHARGE_DELAY);

	corgikbd_activate_col(col);
	udelay(KB_ACTIVATE_DELAY);

	rowd = GET_ROWS_STATUS(col);
	for (row = 0; row < KB_ROWS; row++) {
	unsigned int scancode, pressed;

	scancode = SCANCODE(row, col);
	pressed = rowd & KB_ROWMASK(row);

	input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);

	if (pressed)
	num_pressed++;

	if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
	&& time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
	input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
	corgikbd_data->suspend_jiffies=jiffies;
	}
	}
	corgikbd_reset_col(col);
	}

	corgikbd_activate_all();

	input_sync(corgikbd_data->input);

	/* if any keys are pressed, enable the timer */
	if (num_pressed)
	mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));

	spin_unlock_irqrestore(&corgikbd_data->lock, flags);
	}

	/*
	* corgi keyboard interrupt handler.
	*/
	static irqreturn_t corgikbd_interrupt(int irq, void *dev_id)
	{
	struct corgikbd *corgikbd_data = dev_id;

	if (!timer_pending(&corgikbd_data->timer)) {
	/ wait chattering delay /
	udelay(20);
	corgikbd_scankeyboard(corgikbd_data);
	}

	return IRQ_HANDLED;
	}

	/*
	* corgi timer checking for released keys
	*/
	static void corgikbd_timer_callback(unsigned long data)
	{
	struct corgikbd corgikbd_data = (struct corgikbd ) data;
	corgikbd_scankeyboard(corgikbd_data, NULL);
	}

	/*
	* The hinge switches generate no interrupt so they need to be
	* monitored by a timer.
	*
	* We debounce the switches and pass them to the input system.
	*
	* gprr == 0x00 - Keyboard with Landscape Screen
	* 0x08 - No Keyboard with Portrait Screen
	* 0x0c - Keyboard and Screen Closed
	*/

	#define READ_GPIO_BIT(x) (GPLR(x) & GPIO_bit(x))
	#define HINGE_STABLE_COUNT 2
	static int sharpsl_hinge_state;
	static int hinge_count;

	static void corgikbd_hinge_timer(unsigned long data)
	{
	struct corgikbd corgikbd_data = (struct corgikbd ) data;
	unsigned long gprr;
	unsigned long flags;

	gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA \| CORGI_SCP_SWB);
	gprr \|= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
	if (gprr != sharpsl_hinge_state) {
	hinge_count = 0;
	sharpsl_hinge_state = gprr;
	} else if (hinge_count < HINGE_STABLE_COUNT) {
	hinge_count++;
	if (hinge_count >= HINGE_STABLE_COUNT) {
	spin_lock_irqsave(&corgikbd_data->lock, flags);

	input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
	input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
	input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
	input_sync(corgikbd_data->input);

	spin_unlock_irqrestore(&corgikbd_data->lock, flags);
	}
	}
	mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
	}

	#ifdef CONFIG_PM
	static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
	{
	int i;
	struct corgikbd *corgikbd = platform_get_drvdata(dev);

	corgikbd->suspended = 1;
	/* strobe 0 is the power key so this can't be made an input for
	powersaving therefore i = 1 */
	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_IN);

	return 0;
	}

	static int corgikbd_resume(struct platform_device *dev)
	{
	int i;
	struct corgikbd *corgikbd = platform_get_drvdata(dev);

	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_OUT \| GPIO_DFLT_HIGH);

	/* Upon resume, ignore the suspend key for a short while */
	corgikbd->suspend_jiffies=jiffies;
	corgikbd->suspended = 0;

	return 0;
	}
	#else
	#define corgikbd_suspend NULL
	#define corgikbd_resume NULL
	#endif

	static int __init corgikbd_probe(struct platform_device *pdev)
	{
	struct corgikbd *corgikbd;
	struct input_dev *input_dev;
	int i;

	corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!corgikbd \|\| !input_dev) {
	kfree(corgikbd);
	input_free_device(input_dev);
	return -ENOMEM;
	}

	platform_set_drvdata(pdev, corgikbd);

	corgikbd->input = input_dev;
	spin_lock_init(&corgikbd->lock);

	/* Init Keyboard rescan timer */
	init_timer(&corgikbd->timer);
	corgikbd->timer.function = corgikbd_timer_callback;
	corgikbd->timer.data = (unsigned long) corgikbd;

	/* Init Hinge Timer */
	init_timer(&corgikbd->htimer);
	corgikbd->htimer.function = corgikbd_hinge_timer;
	corgikbd->htimer.data = (unsigned long) corgikbd;

	corgikbd->suspend_jiffies=jiffies;

	memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));

	input_dev->name = "Corgi Keyboard";
	input_dev->phys = "corgikbd/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->cdev.dev = &pdev->dev;
	input_dev->private = corgikbd;

	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_REP) \| BIT(EV_PWR) \| BIT(EV_SW);
	input_dev->keycode = corgikbd->keycode;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);

	for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
	set_bit(corgikbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);
	set_bit(SW_LID, input_dev->swbit);
	set_bit(SW_TABLET_MODE, input_dev->swbit);
	set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);

	input_register_device(corgikbd->input);

	mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
	pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) \| GPIO_IN);
	if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING,
	"corgikbd", corgikbd))
	printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
	}

	/* Set Strobe lines as outputs - set high */
	for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_OUT \| GPIO_DFLT_HIGH);

	/* Setup the headphone jack as an input */
	pxa_gpio_mode(CORGI_GPIO_AK_INT \| GPIO_IN);

	return 0;
	}

	static int corgikbd_remove(struct platform_device *pdev)
	{
	int i;
	struct corgikbd *corgikbd = platform_get_drvdata(pdev);

	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
	free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);

	del_timer_sync(&corgikbd->htimer);
	del_timer_sync(&corgikbd->timer);

	input_unregister_device(corgikbd->input);

	kfree(corgikbd);

	return 0;
	}

	static struct platform_driver corgikbd_driver = {
	.probe = corgikbd_probe,
	.remove = corgikbd_remove,
	.suspend = corgikbd_suspend,
	.resume = corgikbd_resume,
	.driver = {
	.name = "corgi-keyboard",
	},
	};

	static int __devinit corgikbd_init(void)
	{
	return platform_driver_register(&corgikbd_driver);
	}

	static void __exit corgikbd_exit(void)
	{
	platform_driver_unregister(&corgikbd_driver);
	}

	module_init(corgikbd_init);
	module_exit(corgikbd_exit);

	MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
	MODULE_DESCRIPTION("Corgi Keyboard Driver");
	MODULE_LICENSE("GPLv2");