drivers/input/keyboard/spitzkbd.c - kernel/msm-4.9 - Gitiles

 /*
  *  Keyboard driver for Sharp Spitz, Borzoi and Akita (SL-Cxx00 series)
  *
  *  Copyright (c) 2005 Richard Purdie
  *
  *  Based on corgikbd.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 <mach/spitz.h>
 #include <mach/pxa2xx-gpio.h>

 #define KB_ROWS			7
 #define KB_COLS			11
 #define KB_ROWMASK(r)		(1 << (r))
 #define SCANCODE(r,c)		(((r)<<4) + (c) + 1)
 #define	NR_SCANCODES		((KB_ROWS<<4) + 1)

 #define SCAN_INTERVAL		(50) /* ms */
 #define HINGE_SCAN_INTERVAL	(150) /* ms */

 #define SPITZ_KEY_CALENDER	KEY_F1
 #define SPITZ_KEY_ADDRESS	KEY_F2
 #define SPITZ_KEY_FN		KEY_F3
 #define SPITZ_KEY_CANCEL	KEY_F4
 #define SPITZ_KEY_EXOK		KEY_F5
 #define SPITZ_KEY_EXCANCEL	KEY_F6
 #define SPITZ_KEY_EXJOGDOWN	KEY_F7
 #define SPITZ_KEY_EXJOGUP	KEY_F8
 #define SPITZ_KEY_JAP1		KEY_LEFTALT
 #define SPITZ_KEY_JAP2		KEY_RIGHTCTRL
 #define SPITZ_KEY_SYNC		KEY_F9
 #define SPITZ_KEY_MAIL		KEY_F10
 #define SPITZ_KEY_OK		KEY_F11
 #define SPITZ_KEY_MENU		KEY_F12

 static unsigned char spitzkbd_keycode[NR_SCANCODES] = {
 	0,                                                                                                                /* 0 */
 	KEY_LEFTCTRL, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, SPITZ_KEY_EXOK, SPITZ_KEY_EXCANCEL, 0, 0, 0, 0, 0,  /* 1-16 */
 	0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, SPITZ_KEY_EXJOGDOWN, SPITZ_KEY_EXJOGUP, 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 */
 	SPITZ_KEY_ADDRESS, 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 */
 	SPITZ_KEY_CALENDER, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0,	  /* 65-80 */
 	SPITZ_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, SPITZ_KEY_FN, 0, 0, 0, 0, 0,      /* 81-96 */
 	KEY_SYSRQ, SPITZ_KEY_JAP1, SPITZ_KEY_JAP2, SPITZ_KEY_CANCEL, SPITZ_KEY_OK, SPITZ_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0  /* 97-112 */
 };

 static int spitz_strobes[] = {
 	SPITZ_GPIO_KEY_STROBE0,
 	SPITZ_GPIO_KEY_STROBE1,
 	SPITZ_GPIO_KEY_STROBE2,
 	SPITZ_GPIO_KEY_STROBE3,
 	SPITZ_GPIO_KEY_STROBE4,
 	SPITZ_GPIO_KEY_STROBE5,
 	SPITZ_GPIO_KEY_STROBE6,
 	SPITZ_GPIO_KEY_STROBE7,
 	SPITZ_GPIO_KEY_STROBE8,
 	SPITZ_GPIO_KEY_STROBE9,
 	SPITZ_GPIO_KEY_STROBE10,
 };

 static int spitz_senses[] = {
 	SPITZ_GPIO_KEY_SENSE0,
 	SPITZ_GPIO_KEY_SENSE1,
 	SPITZ_GPIO_KEY_SENSE2,
 	SPITZ_GPIO_KEY_SENSE3,
 	SPITZ_GPIO_KEY_SENSE4,
 	SPITZ_GPIO_KEY_SENSE5,
 	SPITZ_GPIO_KEY_SENSE6,
 };

 struct spitzkbd {
 	unsigned char keycode[ARRAY_SIZE(spitzkbd_keycode)];
 	struct input_dev *input;
 	char phys[32];

 	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 the generic gpio functions to alter
  *       GPDR but it requires a function call per GPIO bit which is
  *       excessive when we need to access 11 bits at once, multiple times.
  * These functions must be called within local_irq_save()/local_irq_restore()
  * or similar.
  */
 static inline void spitzkbd_discharge_all(void)
 {
 	/* STROBE All HiZ */
 	GPCR0  =  SPITZ_GPIO_G0_STROBE_BIT;
 	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
 	GPCR1  =  SPITZ_GPIO_G1_STROBE_BIT;
 	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
 	GPCR2  =  SPITZ_GPIO_G2_STROBE_BIT;
 	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
 	GPCR3  =  SPITZ_GPIO_G3_STROBE_BIT;
 	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
 }

 static inline void spitzkbd_activate_all(void)
 {
 	/* STROBE ALL -> High */
 	GPSR0  =  SPITZ_GPIO_G0_STROBE_BIT;
 	GPDR0 |=  SPITZ_GPIO_G0_STROBE_BIT;
 	GPSR1  =  SPITZ_GPIO_G1_STROBE_BIT;
 	GPDR1 |=  SPITZ_GPIO_G1_STROBE_BIT;
 	GPSR2  =  SPITZ_GPIO_G2_STROBE_BIT;
 	GPDR2 |=  SPITZ_GPIO_G2_STROBE_BIT;
 	GPSR3  =  SPITZ_GPIO_G3_STROBE_BIT;
 	GPDR3 |=  SPITZ_GPIO_G3_STROBE_BIT;

 	udelay(KB_DISCHARGE_DELAY);

 	/* Clear any interrupts we may have triggered when altering the GPIO lines */
 	GEDR0 = SPITZ_GPIO_G0_SENSE_BIT;
 	GEDR1 = SPITZ_GPIO_G1_SENSE_BIT;
 	GEDR2 = SPITZ_GPIO_G2_SENSE_BIT;
 	GEDR3 = SPITZ_GPIO_G3_SENSE_BIT;
 }

 static inline void spitzkbd_activate_col(int col)
 {
 	int gpio = spitz_strobes[col];
 	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
 	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
 	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
 	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
 	GPSR(gpio) = GPIO_bit(gpio);
 	GPDR(gpio) |= GPIO_bit(gpio);
 }

 static inline void spitzkbd_reset_col(int col)
 {
 	int gpio = spitz_strobes[col];
 	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
 	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
 	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
 	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
 	GPCR(gpio) = GPIO_bit(gpio);
 	GPDR(gpio) |= GPIO_bit(gpio);
 }

 static inline int spitzkbd_get_row_status(int col)
 {
 	return ((GPLR0 >> 12) & 0x01) | ((GPLR0 >> 16) & 0x02)
 		| ((GPLR2 >> 25) & 0x04) | ((GPLR1 << 1) & 0x08)
 		| ((GPLR1 >> 0) & 0x10) | ((GPLR1 >> 1) & 0x60);
 }

 /*
  * The spitz 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 spitzkbd_scankeyboard(struct spitzkbd *spitzkbd_data)
 {
 	unsigned int row, col, rowd;
 	unsigned long flags;
 	unsigned int num_pressed, pwrkey = ((GPLR(SPITZ_GPIO_ON_KEY) & GPIO_bit(SPITZ_GPIO_ON_KEY)) != 0);

 	if (spitzkbd_data->suspended)
 		return;

 	spin_lock_irqsave(&spitzkbd_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..)
 		 */

 		spitzkbd_discharge_all();
 		udelay(KB_DISCHARGE_DELAY);

 		spitzkbd_activate_col(col);
 		udelay(KB_ACTIVATE_DELAY);

 		rowd = spitzkbd_get_row_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(spitzkbd_data->input, spitzkbd_data->keycode[scancode], pressed);

 			if (pressed)
 				num_pressed++;
 		}
 		spitzkbd_reset_col(col);
 	}

 	spitzkbd_activate_all();

 	input_report_key(spitzkbd_data->input, SPITZ_KEY_SYNC, (GPLR(SPITZ_GPIO_SYNC) & GPIO_bit(SPITZ_GPIO_SYNC)) != 0 );
 	input_report_key(spitzkbd_data->input, KEY_SUSPEND, pwrkey);

 	if (pwrkey && time_after(jiffies, spitzkbd_data->suspend_jiffies + msecs_to_jiffies(1000))) {
 		input_event(spitzkbd_data->input, EV_PWR, KEY_SUSPEND, 1);
 		spitzkbd_data->suspend_jiffies = jiffies;
 	}

 	input_sync(spitzkbd_data->input);

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

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

 /*
  * spitz keyboard interrupt handler.
  */
 static irqreturn_t spitzkbd_interrupt(int irq, void *dev_id)
 {
 	struct spitzkbd *spitzkbd_data = dev_id;

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

 	return IRQ_HANDLED;
 }

 /*
  * spitz timer checking for released keys
  */
 static void spitzkbd_timer_callback(unsigned long data)
 {
 	struct spitzkbd *spitzkbd_data = (struct spitzkbd *) data;

 	spitzkbd_scankeyboard(spitzkbd_data);
 }

 /*
  * The hinge switches generate an interrupt.
  * We debounce the switches and pass them to the input system.
  */

 static irqreturn_t spitzkbd_hinge_isr(int irq, void *dev_id)
 {
 	struct spitzkbd *spitzkbd_data = dev_id;

 	if (!timer_pending(&spitzkbd_data->htimer))
 		mod_timer(&spitzkbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

 	return IRQ_HANDLED;
 }

 #define HINGE_STABLE_COUNT 2
 static int sharpsl_hinge_state;
 static int hinge_count;

 static void spitzkbd_hinge_timer(unsigned long data)
 {
 	struct spitzkbd *spitzkbd_data = (struct spitzkbd *) data;
 	unsigned long state;
 	unsigned long flags;

 	state = GPLR(SPITZ_GPIO_SWA) & (GPIO_bit(SPITZ_GPIO_SWA)|GPIO_bit(SPITZ_GPIO_SWB));
 	state |= (GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT));
 	if (state != sharpsl_hinge_state) {
 		hinge_count = 0;
 		sharpsl_hinge_state = state;
 	} else if (hinge_count < HINGE_STABLE_COUNT) {
 		hinge_count++;
 	}

 	if (hinge_count >= HINGE_STABLE_COUNT) {
 		spin_lock_irqsave(&spitzkbd_data->lock, flags);

 		input_report_switch(spitzkbd_data->input, SW_LID, ((GPLR(SPITZ_GPIO_SWA) & GPIO_bit(SPITZ_GPIO_SWA)) != 0));
 		input_report_switch(spitzkbd_data->input, SW_TABLET_MODE, ((GPLR(SPITZ_GPIO_SWB) & GPIO_bit(SPITZ_GPIO_SWB)) != 0));
 		input_report_switch(spitzkbd_data->input, SW_HEADPHONE_INSERT, ((GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT)) != 0));
 		input_sync(spitzkbd_data->input);

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

 #ifdef CONFIG_PM
 static int spitzkbd_suspend(struct platform_device *dev, pm_message_t state)
 {
 	int i;
 	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);
 	spitzkbd->suspended = 1;

 	/* Set Strobe lines as inputs - *except* strobe line 0 leave this
 	   enabled so we can detect a power button press for resume */
 	for (i = 1; i < SPITZ_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(spitz_strobes[i] | GPIO_IN);

 	return 0;
 }

 static int spitzkbd_resume(struct platform_device *dev)
 {
 	int i;
 	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

 	for (i = 0; i < SPITZ_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(spitz_strobes[i] | GPIO_OUT | GPIO_DFLT_HIGH);

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

 	return 0;
 }
 #else
 #define spitzkbd_suspend	NULL
 #define spitzkbd_resume		NULL
 #endif

 static int __devinit spitzkbd_probe(struct platform_device *dev)
 {
 	struct spitzkbd *spitzkbd;
 	struct input_dev *input_dev;
 	int i, err = -ENOMEM;

 	spitzkbd = kzalloc(sizeof(struct spitzkbd), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!spitzkbd || !input_dev)
 		goto fail;

 	platform_set_drvdata(dev, spitzkbd);
 	strcpy(spitzkbd->phys, "spitzkbd/input0");

 	spin_lock_init(&spitzkbd->lock);

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

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

 	spitzkbd->suspend_jiffies = jiffies;

 	spitzkbd->input = input_dev;

 	input_dev->name = "Spitz Keyboard";
 	input_dev->phys = spitzkbd->phys;
 	input_dev->dev.parent = &dev->dev;

 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0100;

 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
 		BIT_MASK(EV_PWR) | BIT_MASK(EV_SW);
 	input_dev->keycode = spitzkbd->keycode;
 	input_dev->keycodesize = sizeof(unsigned char);
 	input_dev->keycodemax = ARRAY_SIZE(spitzkbd_keycode);

 	memcpy(spitzkbd->keycode, spitzkbd_keycode, sizeof(spitzkbd->keycode));
 	for (i = 0; i < ARRAY_SIZE(spitzkbd_keycode); i++)
 		set_bit(spitzkbd->keycode[i], input_dev->keybit);
 	clear_bit(0, input_dev->keybit);
 	set_bit(KEY_SUSPEND, 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);

 	err = input_register_device(input_dev);
 	if (err)
 		goto fail;

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

 	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 	for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++) {
 		pxa_gpio_mode(spitz_senses[i] | GPIO_IN);
 		if (request_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd_interrupt,
 				IRQF_DISABLED|IRQF_TRIGGER_RISING,
 				"Spitzkbd Sense", spitzkbd))
 			printk(KERN_WARNING "spitzkbd: Can't get Sense IRQ: %d!\n", i);
 	}

 	/* Set Strobe lines as outputs - set high */
 	for (i = 0; i < SPITZ_KEY_STROBE_NUM; i++)
 		pxa_gpio_mode(spitz_strobes[i] | GPIO_OUT | GPIO_DFLT_HIGH);

 	pxa_gpio_mode(SPITZ_GPIO_SYNC | GPIO_IN);
 	pxa_gpio_mode(SPITZ_GPIO_ON_KEY | GPIO_IN);
 	pxa_gpio_mode(SPITZ_GPIO_SWA | GPIO_IN);
 	pxa_gpio_mode(SPITZ_GPIO_SWB | GPIO_IN);

 	request_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd_interrupt,
 		    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 		    "Spitzkbd Sync", spitzkbd);
 	request_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd_interrupt,
 		    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 		    "Spitzkbd PwrOn", spitzkbd);
 	request_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd_hinge_isr,
 		    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 		    "Spitzkbd SWA", spitzkbd);
 	request_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd_hinge_isr,
 		    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 		    "Spitzkbd SWB", spitzkbd);
 	request_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd_hinge_isr,
 		    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 		    "Spitzkbd HP", spitzkbd);

 	return 0;

  fail:	input_free_device(input_dev);
 	kfree(spitzkbd);
 	return err;
 }

 static int __devexit spitzkbd_remove(struct platform_device *dev)
 {
 	int i;
 	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

 	for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++)
 		free_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd);

 	free_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd);
 	free_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd);
 	free_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd);
 	free_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd);
 	free_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd);

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

 	input_unregister_device(spitzkbd->input);

 	kfree(spitzkbd);

 	return 0;
 }

 static struct platform_driver spitzkbd_driver = {
 	.probe		= spitzkbd_probe,
 	.remove		= __devexit_p(spitzkbd_remove),
 	.suspend	= spitzkbd_suspend,
 	.resume		= spitzkbd_resume,
 	.driver		= {
 		.name	= "spitz-keyboard",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init spitzkbd_init(void)
 {
 	return platform_driver_register(&spitzkbd_driver);
 }

 static void __exit spitzkbd_exit(void)
 {
 	platform_driver_unregister(&spitzkbd_driver);
 }

 module_init(spitzkbd_init);
 module_exit(spitzkbd_exit);

 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 MODULE_DESCRIPTION("Spitz Keyboard Driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:spitz-keyboard");
	/*
	* Keyboard driver for Sharp Spitz, Borzoi and Akita (SL-Cxx00 series)
	*
	* Copyright (c) 2005 Richard Purdie
	*
	* Based on corgikbd.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 <mach/spitz.h>
	#include <mach/pxa2xx-gpio.h>

	#define KB_ROWS 7
	#define KB_COLS 11
	#define KB_ROWMASK(r) (1 << (r))
	#define SCANCODE(r,c) (((r)<<4) + (c) + 1)
	#define NR_SCANCODES ((KB_ROWS<<4) + 1)

	#define SCAN_INTERVAL (50) /* ms */
	#define HINGE_SCAN_INTERVAL (150) /* ms */

	#define SPITZ_KEY_CALENDER KEY_F1
	#define SPITZ_KEY_ADDRESS KEY_F2
	#define SPITZ_KEY_FN KEY_F3
	#define SPITZ_KEY_CANCEL KEY_F4
	#define SPITZ_KEY_EXOK KEY_F5
	#define SPITZ_KEY_EXCANCEL KEY_F6
	#define SPITZ_KEY_EXJOGDOWN KEY_F7
	#define SPITZ_KEY_EXJOGUP KEY_F8
	#define SPITZ_KEY_JAP1 KEY_LEFTALT
	#define SPITZ_KEY_JAP2 KEY_RIGHTCTRL
	#define SPITZ_KEY_SYNC KEY_F9
	#define SPITZ_KEY_MAIL KEY_F10
	#define SPITZ_KEY_OK KEY_F11
	#define SPITZ_KEY_MENU KEY_F12

	static unsigned char spitzkbd_keycode[NR_SCANCODES] = {
	0, /* 0 */
	KEY_LEFTCTRL, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, SPITZ_KEY_EXOK, SPITZ_KEY_EXCANCEL, 0, 0, 0, 0, 0, /* 1-16 */
	0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, SPITZ_KEY_EXJOGDOWN, SPITZ_KEY_EXJOGUP, 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 */
	SPITZ_KEY_ADDRESS, 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 */
	SPITZ_KEY_CALENDER, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, /* 65-80 */
	SPITZ_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, SPITZ_KEY_FN, 0, 0, 0, 0, 0, /* 81-96 */
	KEY_SYSRQ, SPITZ_KEY_JAP1, SPITZ_KEY_JAP2, SPITZ_KEY_CANCEL, SPITZ_KEY_OK, SPITZ_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0 /* 97-112 */
	};

	static int spitz_strobes[] = {
	SPITZ_GPIO_KEY_STROBE0,
	SPITZ_GPIO_KEY_STROBE1,
	SPITZ_GPIO_KEY_STROBE2,
	SPITZ_GPIO_KEY_STROBE3,
	SPITZ_GPIO_KEY_STROBE4,
	SPITZ_GPIO_KEY_STROBE5,
	SPITZ_GPIO_KEY_STROBE6,
	SPITZ_GPIO_KEY_STROBE7,
	SPITZ_GPIO_KEY_STROBE8,
	SPITZ_GPIO_KEY_STROBE9,
	SPITZ_GPIO_KEY_STROBE10,
	};

	static int spitz_senses[] = {
	SPITZ_GPIO_KEY_SENSE0,
	SPITZ_GPIO_KEY_SENSE1,
	SPITZ_GPIO_KEY_SENSE2,
	SPITZ_GPIO_KEY_SENSE3,
	SPITZ_GPIO_KEY_SENSE4,
	SPITZ_GPIO_KEY_SENSE5,
	SPITZ_GPIO_KEY_SENSE6,
	};

	struct spitzkbd {
	unsigned char keycode[ARRAY_SIZE(spitzkbd_keycode)];
	struct input_dev *input;
	char phys[32];

	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 the generic gpio functions to alter
	* GPDR but it requires a function call per GPIO bit which is
	* excessive when we need to access 11 bits at once, multiple times.
	* These functions must be called within local_irq_save()/local_irq_restore()
	* or similar.
	*/
	static inline void spitzkbd_discharge_all(void)
	{
	/* STROBE All HiZ */
	GPCR0 = SPITZ_GPIO_G0_STROBE_BIT;
	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
	GPCR1 = SPITZ_GPIO_G1_STROBE_BIT;
	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
	GPCR2 = SPITZ_GPIO_G2_STROBE_BIT;
	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
	GPCR3 = SPITZ_GPIO_G3_STROBE_BIT;
	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
	}

	static inline void spitzkbd_activate_all(void)
	{
	/* STROBE ALL -> High */
	GPSR0 = SPITZ_GPIO_G0_STROBE_BIT;
	GPDR0 \|= SPITZ_GPIO_G0_STROBE_BIT;
	GPSR1 = SPITZ_GPIO_G1_STROBE_BIT;
	GPDR1 \|= SPITZ_GPIO_G1_STROBE_BIT;
	GPSR2 = SPITZ_GPIO_G2_STROBE_BIT;
	GPDR2 \|= SPITZ_GPIO_G2_STROBE_BIT;
	GPSR3 = SPITZ_GPIO_G3_STROBE_BIT;
	GPDR3 \|= SPITZ_GPIO_G3_STROBE_BIT;

	udelay(KB_DISCHARGE_DELAY);

	/* Clear any interrupts we may have triggered when altering the GPIO lines */
	GEDR0 = SPITZ_GPIO_G0_SENSE_BIT;
	GEDR1 = SPITZ_GPIO_G1_SENSE_BIT;
	GEDR2 = SPITZ_GPIO_G2_SENSE_BIT;
	GEDR3 = SPITZ_GPIO_G3_SENSE_BIT;
	}

	static inline void spitzkbd_activate_col(int col)
	{
	int gpio = spitz_strobes[col];
	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
	GPSR(gpio) = GPIO_bit(gpio);
	GPDR(gpio) \|= GPIO_bit(gpio);
	}

	static inline void spitzkbd_reset_col(int col)
	{
	int gpio = spitz_strobes[col];
	GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
	GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
	GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
	GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
	GPCR(gpio) = GPIO_bit(gpio);
	GPDR(gpio) \|= GPIO_bit(gpio);
	}

	static inline int spitzkbd_get_row_status(int col)
	{
	return ((GPLR0 >> 12) & 0x01) \| ((GPLR0 >> 16) & 0x02)
	\| ((GPLR2 >> 25) & 0x04) \| ((GPLR1 << 1) & 0x08)
	\| ((GPLR1 >> 0) & 0x10) \| ((GPLR1 >> 1) & 0x60);
	}

	/*
	* The spitz 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 spitzkbd_scankeyboard(struct spitzkbd *spitzkbd_data)
	{
	unsigned int row, col, rowd;
	unsigned long flags;
	unsigned int num_pressed, pwrkey = ((GPLR(SPITZ_GPIO_ON_KEY) & GPIO_bit(SPITZ_GPIO_ON_KEY)) != 0);

	if (spitzkbd_data->suspended)
	return;

	spin_lock_irqsave(&spitzkbd_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..)
	*/

	spitzkbd_discharge_all();
	udelay(KB_DISCHARGE_DELAY);

	spitzkbd_activate_col(col);
	udelay(KB_ACTIVATE_DELAY);

	rowd = spitzkbd_get_row_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(spitzkbd_data->input, spitzkbd_data->keycode[scancode], pressed);

	if (pressed)
	num_pressed++;
	}
	spitzkbd_reset_col(col);
	}

	spitzkbd_activate_all();

	input_report_key(spitzkbd_data->input, SPITZ_KEY_SYNC, (GPLR(SPITZ_GPIO_SYNC) & GPIO_bit(SPITZ_GPIO_SYNC)) != 0 );
	input_report_key(spitzkbd_data->input, KEY_SUSPEND, pwrkey);

	if (pwrkey && time_after(jiffies, spitzkbd_data->suspend_jiffies + msecs_to_jiffies(1000))) {
	input_event(spitzkbd_data->input, EV_PWR, KEY_SUSPEND, 1);
	spitzkbd_data->suspend_jiffies = jiffies;
	}

	input_sync(spitzkbd_data->input);

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

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

	/*
	* spitz keyboard interrupt handler.
	*/
	static irqreturn_t spitzkbd_interrupt(int irq, void *dev_id)
	{
	struct spitzkbd *spitzkbd_data = dev_id;

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

	return IRQ_HANDLED;
	}

	/*
	* spitz timer checking for released keys
	*/
	static void spitzkbd_timer_callback(unsigned long data)
	{
	struct spitzkbd spitzkbd_data = (struct spitzkbd ) data;

	spitzkbd_scankeyboard(spitzkbd_data);
	}

	/*
	* The hinge switches generate an interrupt.
	* We debounce the switches and pass them to the input system.
	*/

	static irqreturn_t spitzkbd_hinge_isr(int irq, void *dev_id)
	{
	struct spitzkbd *spitzkbd_data = dev_id;

	if (!timer_pending(&spitzkbd_data->htimer))
	mod_timer(&spitzkbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

	return IRQ_HANDLED;
	}

	#define HINGE_STABLE_COUNT 2
	static int sharpsl_hinge_state;
	static int hinge_count;

	static void spitzkbd_hinge_timer(unsigned long data)
	{
	struct spitzkbd spitzkbd_data = (struct spitzkbd ) data;
	unsigned long state;
	unsigned long flags;

	state = GPLR(SPITZ_GPIO_SWA) & (GPIO_bit(SPITZ_GPIO_SWA)\|GPIO_bit(SPITZ_GPIO_SWB));
	state \|= (GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT));
	if (state != sharpsl_hinge_state) {
	hinge_count = 0;
	sharpsl_hinge_state = state;
	} else if (hinge_count < HINGE_STABLE_COUNT) {
	hinge_count++;
	}

	if (hinge_count >= HINGE_STABLE_COUNT) {
	spin_lock_irqsave(&spitzkbd_data->lock, flags);

	input_report_switch(spitzkbd_data->input, SW_LID, ((GPLR(SPITZ_GPIO_SWA) & GPIO_bit(SPITZ_GPIO_SWA)) != 0));
	input_report_switch(spitzkbd_data->input, SW_TABLET_MODE, ((GPLR(SPITZ_GPIO_SWB) & GPIO_bit(SPITZ_GPIO_SWB)) != 0));
	input_report_switch(spitzkbd_data->input, SW_HEADPHONE_INSERT, ((GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT)) != 0));
	input_sync(spitzkbd_data->input);

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

	#ifdef CONFIG_PM
	static int spitzkbd_suspend(struct platform_device *dev, pm_message_t state)
	{
	int i;
	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);
	spitzkbd->suspended = 1;

	/* Set Strobe lines as inputs - except strobe line 0 leave this
	enabled so we can detect a power button press for resume */
	for (i = 1; i < SPITZ_KEY_STROBE_NUM; i++)
	pxa_gpio_mode(spitz_strobes[i] \| GPIO_IN);

	return 0;
	}

	static int spitzkbd_resume(struct platform_device *dev)
	{
	int i;
	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

	for (i = 0; i < SPITZ_KEY_STROBE_NUM; i++)
	pxa_gpio_mode(spitz_strobes[i] \| GPIO_OUT \| GPIO_DFLT_HIGH);

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

	return 0;
	}
	#else
	#define spitzkbd_suspend NULL
	#define spitzkbd_resume NULL
	#endif

	static int __devinit spitzkbd_probe(struct platform_device *dev)
	{
	struct spitzkbd *spitzkbd;
	struct input_dev *input_dev;
	int i, err = -ENOMEM;

	spitzkbd = kzalloc(sizeof(struct spitzkbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!spitzkbd \|\| !input_dev)
	goto fail;

	platform_set_drvdata(dev, spitzkbd);
	strcpy(spitzkbd->phys, "spitzkbd/input0");

	spin_lock_init(&spitzkbd->lock);

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

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

	spitzkbd->suspend_jiffies = jiffies;

	spitzkbd->input = input_dev;

	input_dev->name = "Spitz Keyboard";
	input_dev->phys = spitzkbd->phys;
	input_dev->dev.parent = &dev->dev;

	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;

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

	memcpy(spitzkbd->keycode, spitzkbd_keycode, sizeof(spitzkbd->keycode));
	for (i = 0; i < ARRAY_SIZE(spitzkbd_keycode); i++)
	set_bit(spitzkbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);
	set_bit(KEY_SUSPEND, 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);

	err = input_register_device(input_dev);
	if (err)
	goto fail;

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

	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
	for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++) {
	pxa_gpio_mode(spitz_senses[i] \| GPIO_IN);
	if (request_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd_interrupt,
	IRQF_DISABLED\|IRQF_TRIGGER_RISING,
	"Spitzkbd Sense", spitzkbd))
	printk(KERN_WARNING "spitzkbd: Can't get Sense IRQ: %d!\n", i);
	}

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

	pxa_gpio_mode(SPITZ_GPIO_SYNC \| GPIO_IN);
	pxa_gpio_mode(SPITZ_GPIO_ON_KEY \| GPIO_IN);
	pxa_gpio_mode(SPITZ_GPIO_SWA \| GPIO_IN);
	pxa_gpio_mode(SPITZ_GPIO_SWB \| GPIO_IN);

	request_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd_interrupt,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"Spitzkbd Sync", spitzkbd);
	request_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd_interrupt,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"Spitzkbd PwrOn", spitzkbd);
	request_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd_hinge_isr,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"Spitzkbd SWA", spitzkbd);
	request_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd_hinge_isr,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"Spitzkbd SWB", spitzkbd);
	request_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd_hinge_isr,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"Spitzkbd HP", spitzkbd);

	return 0;

	fail: input_free_device(input_dev);
	kfree(spitzkbd);
	return err;
	}

	static int __devexit spitzkbd_remove(struct platform_device *dev)
	{
	int i;
	struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

	for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++)
	free_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd);

	free_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd);
	free_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd);
	free_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd);
	free_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd);
	free_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd);

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

	input_unregister_device(spitzkbd->input);

	kfree(spitzkbd);

	return 0;
	}

	static struct platform_driver spitzkbd_driver = {
	.probe = spitzkbd_probe,
	.remove = __devexit_p(spitzkbd_remove),
	.suspend = spitzkbd_suspend,
	.resume = spitzkbd_resume,
	.driver = {
	.name = "spitz-keyboard",
	.owner = THIS_MODULE,
	},
	};

	static int __init spitzkbd_init(void)
	{
	return platform_driver_register(&spitzkbd_driver);
	}

	static void __exit spitzkbd_exit(void)
	{
	platform_driver_unregister(&spitzkbd_driver);
	}

	module_init(spitzkbd_init);
	module_exit(spitzkbd_exit);

	MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
	MODULE_DESCRIPTION("Spitz Keyboard Driver");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:spitz-keyboard");