drivers/input/keyboard/tosakbd.c - maze/linux - Git at Google

 /*
  *  Keyboard driver for Sharp Tosa models (SL-6000x)
  *
  *  Copyright (c) 2005 Dirk Opfer
  *  Copyright (c) 2007 Dmitry Baryshkov
  *
  *  Based on xtkbd.c/locomkbd.c/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/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>

 #include <mach/gpio.h>
 #include <mach/tosa.h>

 #define KB_ROWMASK(r)		(1 << (r))
 #define SCANCODE(r, c)		(((r)<<4) + (c) + 1)
 #define NR_SCANCODES		SCANCODE(TOSA_KEY_SENSE_NUM - 1, TOSA_KEY_STROBE_NUM - 1) + 1

 #define SCAN_INTERVAL		(HZ/10)

 #define KB_DISCHARGE_DELAY	10
 #define KB_ACTIVATE_DELAY	10

 static unsigned short tosakbd_keycode[NR_SCANCODES] = {
 0,
 0, KEY_W, 0, 0, 0, KEY_K, KEY_BACKSPACE, KEY_P,
 0, 0, 0, 0, 0, 0, 0, 0,
 KEY_Q, KEY_E, KEY_T, KEY_Y, 0, KEY_O, KEY_I, KEY_COMMA,
 0, 0, 0, 0, 0, 0, 0, 0,
 KEY_A, KEY_D, KEY_G, KEY_U, 0, KEY_L, KEY_ENTER, KEY_DOT,
 0, 0, 0, 0, 0, 0, 0, 0,
 KEY_Z, KEY_C, KEY_V, KEY_J, TOSA_KEY_ADDRESSBOOK, TOSA_KEY_CANCEL, TOSA_KEY_CENTER, TOSA_KEY_OK,
 KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, 0,
 KEY_S, KEY_R, KEY_B, KEY_N, TOSA_KEY_CALENDAR, TOSA_KEY_HOMEPAGE, KEY_LEFTCTRL, TOSA_KEY_LIGHT,
 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,
 KEY_TAB, KEY_SLASH, KEY_H, KEY_M, TOSA_KEY_MENU, 0, KEY_UP, 0,
 0, 0, TOSA_KEY_FN, 0, 0, 0, 0, 0,
 KEY_X, KEY_F, KEY_SPACE, KEY_APOSTROPHE, TOSA_KEY_MAIL, KEY_LEFT, KEY_DOWN, KEY_RIGHT,
 0, 0, 0,
 };

 struct tosakbd {
 	unsigned short keycode[ARRAY_SIZE(tosakbd_keycode)];
 	struct input_dev *input;
 	bool suspended;
 	spinlock_t lock; /* protect kbd scanning */
 	struct timer_list timer;
 };


 /* 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 12 bits at once, multiple times.
  * These functions must be called within local_irq_save()/local_irq_restore()
  * or similar.
  */
 #define GET_ROWS_STATUS(c)	((GPLR2 & TOSA_GPIO_ALL_SENSE_BIT) >> TOSA_GPIO_ALL_SENSE_RSHIFT)

 static inline void tosakbd_discharge_all(void)
 {
 	/* STROBE All HiZ */
 	GPCR1  = TOSA_GPIO_HIGH_STROBE_BIT;
 	GPDR1 &= ~TOSA_GPIO_HIGH_STROBE_BIT;
 	GPCR2  = TOSA_GPIO_LOW_STROBE_BIT;
 	GPDR2 &= ~TOSA_GPIO_LOW_STROBE_BIT;
 }

 static inline void tosakbd_activate_all(void)
 {
 	/* STROBE ALL -> High */
 	GPSR1  = TOSA_GPIO_HIGH_STROBE_BIT;
 	GPDR1 |= TOSA_GPIO_HIGH_STROBE_BIT;
 	GPSR2  = TOSA_GPIO_LOW_STROBE_BIT;
 	GPDR2 |= TOSA_GPIO_LOW_STROBE_BIT;

 	udelay(KB_DISCHARGE_DELAY);

 	/* STATE CLEAR */
 	GEDR2 |= TOSA_GPIO_ALL_SENSE_BIT;
 }

 static inline void tosakbd_activate_col(int col)
 {
 	if (col <= 5) {
 		/* STROBE col -> High, not col -> HiZ */
 		GPSR1 = TOSA_GPIO_STROBE_BIT(col);
 		GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 	} else {
 		/* STROBE col -> High, not col -> HiZ */
 		GPSR2 = TOSA_GPIO_STROBE_BIT(col);
 		GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 	}
 }

 static inline void tosakbd_reset_col(int col)
 {
 	if (col <= 5) {
 		/* STROBE col -> Low */
 		GPCR1 = TOSA_GPIO_STROBE_BIT(col);
 		/* STROBE col -> out, not col -> HiZ */
 		GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 	} else {
 		/* STROBE col -> Low */
 		GPCR2 = TOSA_GPIO_STROBE_BIT(col);
 		/* STROBE col -> out, not col -> HiZ */
 		GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 	}
 }
 /*
  * The tosa keyboard only generates interrupts when a key is pressed.
  * So when a key is pressed, we enable a timer.  This timer scans the
  * keyboard, and this is how we detect when the key is released.
  */

 /* Scan the hardware keyboard and push any changes up through the input layer */
 static void tosakbd_scankeyboard(struct platform_device *dev)
 {
 	struct tosakbd *tosakbd = platform_get_drvdata(dev);
 	unsigned int row, col, rowd;
 	unsigned long flags;
 	unsigned int num_pressed = 0;

 	spin_lock_irqsave(&tosakbd->lock, flags);

 	if (tosakbd->suspended)
 		goto out;

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

 		tosakbd_activate_col(col);
 		udelay(KB_ACTIVATE_DELAY);

 		rowd = GET_ROWS_STATUS(col);

 		for (row = 0; row < TOSA_KEY_SENSE_NUM; row++) {
 			unsigned int scancode, pressed;
 			scancode = SCANCODE(row, col);
 			pressed = rowd & KB_ROWMASK(row);

 			if (pressed && !tosakbd->keycode[scancode])
 				dev_warn(&dev->dev,
 						"unhandled scancode: 0x%02x\n",
 						scancode);

 			input_report_key(tosakbd->input,
 					tosakbd->keycode[scancode],
 					pressed);
 			if (pressed)
 				num_pressed++;
 		}

 		tosakbd_reset_col(col);
 	}

 	tosakbd_activate_all();

 	input_sync(tosakbd->input);

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

  out:
 	spin_unlock_irqrestore(&tosakbd->lock, flags);
 }

 /*
  * tosa keyboard interrupt handler.
  */
 static irqreturn_t tosakbd_interrupt(int irq, void *__dev)
 {
 	struct platform_device *dev = __dev;
 	struct tosakbd *tosakbd = platform_get_drvdata(dev);

 	if (!timer_pending(&tosakbd->timer)) {
 		/** wait chattering delay **/
 		udelay(20);
 		tosakbd_scankeyboard(dev);
 	}

 	return IRQ_HANDLED;
 }

 /*
  * tosa timer checking for released keys
  */
 static void tosakbd_timer_callback(unsigned long __dev)
 {
 	struct platform_device *dev = (struct platform_device *)__dev;

 	tosakbd_scankeyboard(dev);
 }

 #ifdef CONFIG_PM
 static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
 {
 	struct tosakbd *tosakbd = platform_get_drvdata(dev);
 	unsigned long flags;

 	spin_lock_irqsave(&tosakbd->lock, flags);
 	tosakbd->suspended = true;
 	spin_unlock_irqrestore(&tosakbd->lock, flags);

 	del_timer_sync(&tosakbd->timer);

 	return 0;
 }

 static int tosakbd_resume(struct platform_device *dev)
 {
 	struct tosakbd *tosakbd = platform_get_drvdata(dev);

 	tosakbd->suspended = false;
 	tosakbd_scankeyboard(dev);

 	return 0;
 }
 #else
 #define tosakbd_suspend		NULL
 #define tosakbd_resume		NULL
 #endif

 static int __devinit tosakbd_probe(struct platform_device *pdev) {

 	int i;
 	struct tosakbd *tosakbd;
 	struct input_dev *input_dev;
 	int error;

 	tosakbd = kzalloc(sizeof(struct tosakbd), GFP_KERNEL);
 	if (!tosakbd)
 		return -ENOMEM;

 	input_dev = input_allocate_device();
 	if (!input_dev) {
 		kfree(tosakbd);
 		return -ENOMEM;
 	}

 	platform_set_drvdata(pdev, tosakbd);

 	spin_lock_init(&tosakbd->lock);

 	/* Init Keyboard rescan timer */
 	init_timer(&tosakbd->timer);
 	tosakbd->timer.function = tosakbd_timer_callback;
 	tosakbd->timer.data = (unsigned long) pdev;

 	tosakbd->input = input_dev;

 	input_set_drvdata(input_dev, tosakbd);
 	input_dev->name = "Tosa Keyboard";
 	input_dev->phys = "tosakbd/input0";
 	input_dev->dev.parent = &pdev->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(EV_KEY) | BIT(EV_REP);
 	input_dev->keycode = tosakbd->keycode;
 	input_dev->keycodesize = sizeof(tosakbd->keycode[0]);
 	input_dev->keycodemax = ARRAY_SIZE(tosakbd_keycode);

 	memcpy(tosakbd->keycode, tosakbd_keycode, sizeof(tosakbd_keycode));

 	for (i = 0; i < ARRAY_SIZE(tosakbd_keycode); i++)
 		__set_bit(tosakbd->keycode[i], input_dev->keybit);
 	__clear_bit(KEY_RESERVED, input_dev->keybit);

 	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
 		int gpio = TOSA_GPIO_KEY_SENSE(i);
 		int irq;
 		error = gpio_request(gpio, "tosakbd");
 		if (error < 0) {
 			printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
 				" error %d\n", gpio, error);
 			goto fail;
 		}

 		error = gpio_direction_input(TOSA_GPIO_KEY_SENSE(i));
 		if (error < 0) {
 			printk(KERN_ERR "tosakbd: failed to configure input"
 				" direction for GPIO %d, error %d\n",
 				gpio, error);
 			gpio_free(gpio);
 			goto fail;
 		}

 		irq = gpio_to_irq(gpio);
 		if (irq < 0) {
 			error = irq;
 			printk(KERN_ERR "gpio-keys: Unable to get irq number"
 				" for GPIO %d, error %d\n",
 				gpio, error);
 			gpio_free(gpio);
 			goto fail;
 		}

 		error = request_irq(irq, tosakbd_interrupt,
 					IRQF_DISABLED | IRQF_TRIGGER_RISING,
 					"tosakbd", pdev);

 		if (error) {
 			printk("tosakbd: Can't get IRQ: %d: error %d!\n",
 					irq, error);
 			gpio_free(gpio);
 			goto fail;
 		}
 	}

 	/* Set Strobe lines as outputs - set high */
 	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++) {
 		int gpio = TOSA_GPIO_KEY_STROBE(i);
 		error = gpio_request(gpio, "tosakbd");
 		if (error < 0) {
 			printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
 				" error %d\n", gpio, error);
 			goto fail2;
 		}

 		error = gpio_direction_output(gpio, 1);
 		if (error < 0) {
 			printk(KERN_ERR "tosakbd: failed to configure input"
 				" direction for GPIO %d, error %d\n",
 				gpio, error);
 			gpio_free(gpio);
 			goto fail2;
 		}

 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		printk(KERN_ERR "tosakbd: Unable to register input device, "
 			"error: %d\n", error);
 		goto fail2;
 	}

 	printk(KERN_INFO "input: Tosa Keyboard Registered\n");

 	return 0;

 fail2:
 	while (--i >= 0)
 		gpio_free(TOSA_GPIO_KEY_STROBE(i));

 	i = TOSA_KEY_SENSE_NUM;
 fail:
 	while (--i >= 0) {
 		free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), pdev);
 		gpio_free(TOSA_GPIO_KEY_SENSE(i));
 	}

 	platform_set_drvdata(pdev, NULL);
 	input_free_device(input_dev);
 	kfree(tosakbd);

 	return error;
 }

 static int __devexit tosakbd_remove(struct platform_device *dev)
 {
 	int i;
 	struct tosakbd *tosakbd = platform_get_drvdata(dev);

 	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++)
 		gpio_free(TOSA_GPIO_KEY_STROBE(i));

 	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
 		free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), dev);
 		gpio_free(TOSA_GPIO_KEY_SENSE(i));
 	}

 	del_timer_sync(&tosakbd->timer);

 	input_unregister_device(tosakbd->input);

 	kfree(tosakbd);

 	return 0;
 }

 static struct platform_driver tosakbd_driver = {
 	.probe		= tosakbd_probe,
 	.remove		= __devexit_p(tosakbd_remove),
 	.suspend	= tosakbd_suspend,
 	.resume		= tosakbd_resume,
 	.driver		= {
 		.name	= "tosa-keyboard",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __devinit tosakbd_init(void)
 {
 	return platform_driver_register(&tosakbd_driver);
 }

 static void __exit tosakbd_exit(void)
 {
 	platform_driver_unregister(&tosakbd_driver);
 }

 module_init(tosakbd_init);
 module_exit(tosakbd_exit);

 MODULE_AUTHOR("Dirk Opfer <Dirk@Opfer-Online.de>");
 MODULE_DESCRIPTION("Tosa Keyboard Driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:tosa-keyboard");
	/*
	* Keyboard driver for Sharp Tosa models (SL-6000x)
	*
	* Copyright (c) 2005 Dirk Opfer
	* Copyright (c) 2007 Dmitry Baryshkov
	*
	* Based on xtkbd.c/locomkbd.c/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/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/input.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>

	#include <mach/gpio.h>
	#include <mach/tosa.h>

	#define KB_ROWMASK(r) (1 << (r))
	#define SCANCODE(r, c) (((r)<<4) + (c) + 1)
	#define NR_SCANCODES SCANCODE(TOSA_KEY_SENSE_NUM - 1, TOSA_KEY_STROBE_NUM - 1) + 1

	#define SCAN_INTERVAL (HZ/10)

	#define KB_DISCHARGE_DELAY 10
	#define KB_ACTIVATE_DELAY 10

	static unsigned short tosakbd_keycode[NR_SCANCODES] = {
	0,
	0, KEY_W, 0, 0, 0, KEY_K, KEY_BACKSPACE, KEY_P,
	0, 0, 0, 0, 0, 0, 0, 0,
	KEY_Q, KEY_E, KEY_T, KEY_Y, 0, KEY_O, KEY_I, KEY_COMMA,
	0, 0, 0, 0, 0, 0, 0, 0,
	KEY_A, KEY_D, KEY_G, KEY_U, 0, KEY_L, KEY_ENTER, KEY_DOT,
	0, 0, 0, 0, 0, 0, 0, 0,
	KEY_Z, KEY_C, KEY_V, KEY_J, TOSA_KEY_ADDRESSBOOK, TOSA_KEY_CANCEL, TOSA_KEY_CENTER, TOSA_KEY_OK,
	KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, 0,
	KEY_S, KEY_R, KEY_B, KEY_N, TOSA_KEY_CALENDAR, TOSA_KEY_HOMEPAGE, KEY_LEFTCTRL, TOSA_KEY_LIGHT,
	0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,
	KEY_TAB, KEY_SLASH, KEY_H, KEY_M, TOSA_KEY_MENU, 0, KEY_UP, 0,
	0, 0, TOSA_KEY_FN, 0, 0, 0, 0, 0,
	KEY_X, KEY_F, KEY_SPACE, KEY_APOSTROPHE, TOSA_KEY_MAIL, KEY_LEFT, KEY_DOWN, KEY_RIGHT,
	0, 0, 0,
	};

	struct tosakbd {
	unsigned short keycode[ARRAY_SIZE(tosakbd_keycode)];
	struct input_dev *input;
	bool suspended;
	spinlock_t lock; /* protect kbd scanning */
	struct timer_list timer;
	};


	/* 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 12 bits at once, multiple times.
	* These functions must be called within local_irq_save()/local_irq_restore()
	* or similar.
	*/
	#define GET_ROWS_STATUS(c) ((GPLR2 & TOSA_GPIO_ALL_SENSE_BIT) >> TOSA_GPIO_ALL_SENSE_RSHIFT)

	static inline void tosakbd_discharge_all(void)
	{
	/* STROBE All HiZ */
	GPCR1 = TOSA_GPIO_HIGH_STROBE_BIT;
	GPDR1 &= ~TOSA_GPIO_HIGH_STROBE_BIT;
	GPCR2 = TOSA_GPIO_LOW_STROBE_BIT;
	GPDR2 &= ~TOSA_GPIO_LOW_STROBE_BIT;
	}

	static inline void tosakbd_activate_all(void)
	{
	/* STROBE ALL -> High */
	GPSR1 = TOSA_GPIO_HIGH_STROBE_BIT;
	GPDR1 \|= TOSA_GPIO_HIGH_STROBE_BIT;
	GPSR2 = TOSA_GPIO_LOW_STROBE_BIT;
	GPDR2 \|= TOSA_GPIO_LOW_STROBE_BIT;

	udelay(KB_DISCHARGE_DELAY);

	/* STATE CLEAR */
	GEDR2 \|= TOSA_GPIO_ALL_SENSE_BIT;
	}

	static inline void tosakbd_activate_col(int col)
	{
	if (col <= 5) {
	/* STROBE col -> High, not col -> HiZ */
	GPSR1 = TOSA_GPIO_STROBE_BIT(col);
	GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) \| TOSA_GPIO_STROBE_BIT(col);
	} else {
	/* STROBE col -> High, not col -> HiZ */
	GPSR2 = TOSA_GPIO_STROBE_BIT(col);
	GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) \| TOSA_GPIO_STROBE_BIT(col);
	}
	}

	static inline void tosakbd_reset_col(int col)
	{
	if (col <= 5) {
	/* STROBE col -> Low */
	GPCR1 = TOSA_GPIO_STROBE_BIT(col);
	/* STROBE col -> out, not col -> HiZ */
	GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) \| TOSA_GPIO_STROBE_BIT(col);
	} else {
	/* STROBE col -> Low */
	GPCR2 = TOSA_GPIO_STROBE_BIT(col);
	/* STROBE col -> out, not col -> HiZ */
	GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) \| TOSA_GPIO_STROBE_BIT(col);
	}
	}
	/*
	* The tosa keyboard only generates interrupts when a key is pressed.
	* So when a key is pressed, we enable a timer. This timer scans the
	* keyboard, and this is how we detect when the key is released.
	*/

	/* Scan the hardware keyboard and push any changes up through the input layer */
	static void tosakbd_scankeyboard(struct platform_device *dev)
	{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);
	unsigned int row, col, rowd;
	unsigned long flags;
	unsigned int num_pressed = 0;

	spin_lock_irqsave(&tosakbd->lock, flags);

	if (tosakbd->suspended)
	goto out;

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

	tosakbd_activate_col(col);
	udelay(KB_ACTIVATE_DELAY);

	rowd = GET_ROWS_STATUS(col);

	for (row = 0; row < TOSA_KEY_SENSE_NUM; row++) {
	unsigned int scancode, pressed;
	scancode = SCANCODE(row, col);
	pressed = rowd & KB_ROWMASK(row);

	if (pressed && !tosakbd->keycode[scancode])
	dev_warn(&dev->dev,
	"unhandled scancode: 0x%02x\n",
	scancode);

	input_report_key(tosakbd->input,
	tosakbd->keycode[scancode],
	pressed);
	if (pressed)
	num_pressed++;
	}

	tosakbd_reset_col(col);
	}

	tosakbd_activate_all();

	input_sync(tosakbd->input);

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

	out:
	spin_unlock_irqrestore(&tosakbd->lock, flags);
	}

	/*
	* tosa keyboard interrupt handler.
	*/
	static irqreturn_t tosakbd_interrupt(int irq, void *__dev)
	{
	struct platform_device *dev = __dev;
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	if (!timer_pending(&tosakbd->timer)) {
	/ wait chattering delay /
	udelay(20);
	tosakbd_scankeyboard(dev);
	}

	return IRQ_HANDLED;
	}

	/*
	* tosa timer checking for released keys
	*/
	static void tosakbd_timer_callback(unsigned long __dev)
	{
	struct platform_device dev = (struct platform_device )__dev;

	tosakbd_scankeyboard(dev);
	}

	#ifdef CONFIG_PM
	static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
	{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&tosakbd->lock, flags);
	tosakbd->suspended = true;
	spin_unlock_irqrestore(&tosakbd->lock, flags);

	del_timer_sync(&tosakbd->timer);

	return 0;
	}

	static int tosakbd_resume(struct platform_device *dev)
	{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	tosakbd->suspended = false;
	tosakbd_scankeyboard(dev);

	return 0;
	}
	#else
	#define tosakbd_suspend NULL
	#define tosakbd_resume NULL
	#endif

	static int __devinit tosakbd_probe(struct platform_device *pdev) {

	int i;
	struct tosakbd *tosakbd;
	struct input_dev *input_dev;
	int error;

	tosakbd = kzalloc(sizeof(struct tosakbd), GFP_KERNEL);
	if (!tosakbd)
	return -ENOMEM;

	input_dev = input_allocate_device();
	if (!input_dev) {
	kfree(tosakbd);
	return -ENOMEM;
	}

	platform_set_drvdata(pdev, tosakbd);

	spin_lock_init(&tosakbd->lock);

	/* Init Keyboard rescan timer */
	init_timer(&tosakbd->timer);
	tosakbd->timer.function = tosakbd_timer_callback;
	tosakbd->timer.data = (unsigned long) pdev;

	tosakbd->input = input_dev;

	input_set_drvdata(input_dev, tosakbd);
	input_dev->name = "Tosa Keyboard";
	input_dev->phys = "tosakbd/input0";
	input_dev->dev.parent = &pdev->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(EV_KEY) \| BIT(EV_REP);
	input_dev->keycode = tosakbd->keycode;
	input_dev->keycodesize = sizeof(tosakbd->keycode[0]);
	input_dev->keycodemax = ARRAY_SIZE(tosakbd_keycode);

	memcpy(tosakbd->keycode, tosakbd_keycode, sizeof(tosakbd_keycode));

	for (i = 0; i < ARRAY_SIZE(tosakbd_keycode); i++)
	__set_bit(tosakbd->keycode[i], input_dev->keybit);
	__clear_bit(KEY_RESERVED, input_dev->keybit);

	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
	int gpio = TOSA_GPIO_KEY_SENSE(i);
	int irq;
	error = gpio_request(gpio, "tosakbd");
	if (error < 0) {
	printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
	" error %d\n", gpio, error);
	goto fail;
	}

	error = gpio_direction_input(TOSA_GPIO_KEY_SENSE(i));
	if (error < 0) {
	printk(KERN_ERR "tosakbd: failed to configure input"
	" direction for GPIO %d, error %d\n",
	gpio, error);
	gpio_free(gpio);
	goto fail;
	}

	irq = gpio_to_irq(gpio);
	if (irq < 0) {
	error = irq;
	printk(KERN_ERR "gpio-keys: Unable to get irq number"
	" for GPIO %d, error %d\n",
	gpio, error);
	gpio_free(gpio);
	goto fail;
	}

	error = request_irq(irq, tosakbd_interrupt,
	IRQF_DISABLED \| IRQF_TRIGGER_RISING,
	"tosakbd", pdev);

	if (error) {
	printk("tosakbd: Can't get IRQ: %d: error %d!\n",
	irq, error);
	gpio_free(gpio);
	goto fail;
	}
	}

	/* Set Strobe lines as outputs - set high */
	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++) {
	int gpio = TOSA_GPIO_KEY_STROBE(i);
	error = gpio_request(gpio, "tosakbd");
	if (error < 0) {
	printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
	" error %d\n", gpio, error);
	goto fail2;
	}

	error = gpio_direction_output(gpio, 1);
	if (error < 0) {
	printk(KERN_ERR "tosakbd: failed to configure input"
	" direction for GPIO %d, error %d\n",
	gpio, error);
	gpio_free(gpio);
	goto fail2;
	}

	}

	error = input_register_device(input_dev);
	if (error) {
	printk(KERN_ERR "tosakbd: Unable to register input device, "
	"error: %d\n", error);
	goto fail2;
	}

	printk(KERN_INFO "input: Tosa Keyboard Registered\n");

	return 0;

	fail2:
	while (--i >= 0)
	gpio_free(TOSA_GPIO_KEY_STROBE(i));

	i = TOSA_KEY_SENSE_NUM;
	fail:
	while (--i >= 0) {
	free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), pdev);
	gpio_free(TOSA_GPIO_KEY_SENSE(i));
	}

	platform_set_drvdata(pdev, NULL);
	input_free_device(input_dev);
	kfree(tosakbd);

	return error;
	}

	static int __devexit tosakbd_remove(struct platform_device *dev)
	{
	int i;
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++)
	gpio_free(TOSA_GPIO_KEY_STROBE(i));

	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
	free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), dev);
	gpio_free(TOSA_GPIO_KEY_SENSE(i));
	}

	del_timer_sync(&tosakbd->timer);

	input_unregister_device(tosakbd->input);

	kfree(tosakbd);

	return 0;
	}

	static struct platform_driver tosakbd_driver = {
	.probe = tosakbd_probe,
	.remove = __devexit_p(tosakbd_remove),
	.suspend = tosakbd_suspend,
	.resume = tosakbd_resume,
	.driver = {
	.name = "tosa-keyboard",
	.owner = THIS_MODULE,
	},
	};

	static int __devinit tosakbd_init(void)
	{
	return platform_driver_register(&tosakbd_driver);
	}

	static void __exit tosakbd_exit(void)
	{
	platform_driver_unregister(&tosakbd_driver);
	}

	module_init(tosakbd_init);
	module_exit(tosakbd_exit);

	MODULE_AUTHOR("Dirk Opfer <Dirk@Opfer-Online.de>");
	MODULE_DESCRIPTION("Tosa Keyboard Driver");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:tosa-keyboard");