drivers/input/keyboard/omap-keypad.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/drivers/input/keyboard/omap-keypad.c
  *
  * OMAP Keypad Driver
  *
  * Copyright (C) 2003 Nokia Corporation
  * Written by Timo Teräs <ext-timo.teras@nokia.com>
  *
  * Added support for H2 & H3 Keypad
  * Copyright (C) 2004 Texas Instruments
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/types.h>
 #include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
 #include <linux/errno.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/keypad.h>
 #include <asm/arch/menelaus.h>
 #include <asm/irq.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <asm/arch/mux.h>

 #undef NEW_BOARD_LEARNING_MODE

 static void omap_kp_tasklet(unsigned long);
 static void omap_kp_timer(unsigned long);

 static unsigned char keypad_state[8];
 static DEFINE_MUTEX(kp_enable_mutex);
 static int kp_enable = 1;
 static int kp_cur_group = -1;

 struct omap_kp {
 	struct input_dev *input;
 	struct timer_list timer;
 	int irq;
 	unsigned int rows;
 	unsigned int cols;
 	unsigned long delay;
 	unsigned int debounce;
 };

 DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);

 static int *keymap;
 static unsigned int *row_gpios;
 static unsigned int *col_gpios;

 #ifdef CONFIG_ARCH_OMAP2
 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
 {
 	int col;
 	for (col = 0; col < omap_kp->cols; col++) {
 		if (value & (1 << col))
 			omap_set_gpio_dataout(col_gpios[col], 1);
 		else
 			omap_set_gpio_dataout(col_gpios[col], 0);
 	}
 }

 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
 {
 	int row;
 	u8 value = 0;

 	for (row = 0; row < omap_kp->rows; row++) {
 		if (omap_get_gpio_datain(row_gpios[row]))
 			value |= (1 << row);
 	}
 	return value;
 }
 #else
 #define		set_col_gpio_val(x, y)	do {} while (0)
 #define		get_row_gpio_val(x)	0
 #endif

 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
 {
 	struct omap_kp *omap_kp = dev_id;

 	/* disable keyboard interrupt and schedule for handling */
 	if (cpu_is_omap24xx()) {
 		int i;
 		for (i = 0; i < omap_kp->rows; i++)
 			disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 	} else
 		/* disable keyboard interrupt and schedule for handling */
 		omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

 	tasklet_schedule(&kp_tasklet);

 	return IRQ_HANDLED;
 }

 static void omap_kp_timer(unsigned long data)
 {
 	tasklet_schedule(&kp_tasklet);
 }

 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 {
 	int col = 0;

 	/* read the keypad status */
 	if (cpu_is_omap24xx()) {
 		int i;
 		for (i = 0; i < omap_kp->rows; i++)
 			disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));

 		/* read the keypad status */
 		for (col = 0; col < omap_kp->cols; col++) {
 			set_col_gpio_val(omap_kp, ~(1 << col));
 			state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
 		}
 		set_col_gpio_val(omap_kp, 0);

 	} else {
 		/* disable keyboard interrupt and schedule for handling */
 		omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

 		/* read the keypad status */
 		omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 		for (col = 0; col < omap_kp->cols; col++) {
 			omap_writew(~(1 << col) & 0xff,
 				    OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);

 			udelay(omap_kp->delay);

 			state[col] = ~omap_readw(OMAP_MPUIO_BASE +
 						 OMAP_MPUIO_KBR_LATCH) & 0xff;
 		}
 		omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 		udelay(2);
 	}
 }

 static inline int omap_kp_find_key(int col, int row)
 {
 	int i, key;

 	key = KEY(col, row, 0);
 	for (i = 0; keymap[i] != 0; i++)
 		if ((keymap[i] & 0xff000000) == key)
 			return keymap[i] & 0x00ffffff;
 	return -1;
 }

 static void omap_kp_tasklet(unsigned long data)
 {
 	struct omap_kp *omap_kp_data = (struct omap_kp *) data;
 	unsigned char new_state[8], changed, key_down = 0;
 	int col, row;
 	int spurious = 0;

 	/* check for any changes */
 	omap_kp_scan_keypad(omap_kp_data, new_state);

 	/* check for changes and print those */
 	for (col = 0; col < omap_kp_data->cols; col++) {
 		changed = new_state[col] ^ keypad_state[col];
 		key_down |= new_state[col];
 		if (changed == 0)
 			continue;

 		for (row = 0; row < omap_kp_data->rows; row++) {
 			int key;
 			if (!(changed & (1 << row)))
 				continue;
 #ifdef NEW_BOARD_LEARNING_MODE
 			printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
 			       row, (new_state[col] & (1 << row)) ?
 			       "pressed" : "released");
 #else
 			key = omap_kp_find_key(col, row);
 			if (key < 0) {
 				printk(KERN_WARNING
 				      "omap-keypad: Spurious key event %d-%d\n",
 				       col, row);
 				/* We scan again after a couple of seconds */
 				spurious = 1;
 				continue;
 			}

 			if (!(kp_cur_group == (key & GROUP_MASK) ||
 			      kp_cur_group == -1))
 				continue;

 			kp_cur_group = key & GROUP_MASK;
 			input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
 					 new_state[col] & (1 << row));
 #endif
 		}
 	}
 	memcpy(keypad_state, new_state, sizeof(keypad_state));

 	if (key_down) {
                 int delay = HZ / 20;
 		/* some key is pressed - keep irq disabled and use timer
 		 * to poll the keypad */
 		if (spurious)
 			delay = 2 * HZ;
 		mod_timer(&omap_kp_data->timer, jiffies + delay);
 	} else {
 		/* enable interrupts */
 		if (cpu_is_omap24xx()) {
 			int i;
 			for (i = 0; i < omap_kp_data->rows; i++)
 				enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 		} else {
 			omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 			kp_cur_group = -1;
 		}
  	}
 }

 static ssize_t omap_kp_enable_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%u\n", kp_enable);
 }

 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
 				    const char *buf, size_t count)
 {
 	int state;

 	if (sscanf(buf, "%u", &state) != 1)
 		return -EINVAL;

 	if ((state != 1) && (state != 0))
 		return -EINVAL;

 	mutex_lock(&kp_enable_mutex);
 	if (state != kp_enable) {
 		if (state)
 			enable_irq(INT_KEYBOARD);
 		else
 			disable_irq(INT_KEYBOARD);
 		kp_enable = state;
 	}
 	mutex_unlock(&kp_enable_mutex);

 	return strnlen(buf, count);
 }

 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);

 #ifdef CONFIG_PM
 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
 {
 	/* Nothing yet */

 	return 0;
 }

 static int omap_kp_resume(struct platform_device *dev)
 {
 	/* Nothing yet */

 	return 0;
 }
 #else
 #define omap_kp_suspend	NULL
 #define omap_kp_resume	NULL
 #endif

 static int __init omap_kp_probe(struct platform_device *pdev)
 {
 	struct omap_kp *omap_kp;
 	struct input_dev *input_dev;
 	struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
 	int i, col_idx, row_idx, irq_idx, ret;

 	if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 		printk(KERN_ERR "No rows, cols or keymap from pdata\n");
 		return -EINVAL;
 	}

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

 	platform_set_drvdata(pdev, omap_kp);

 	omap_kp->input = input_dev;

 	/* Disable the interrupt for the MPUIO keyboard */
 	if (!cpu_is_omap24xx())
 		omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

 	keymap = pdata->keymap;

 	if (pdata->rep)
 		set_bit(EV_REP, input_dev->evbit);

 	if (pdata->delay)
 		omap_kp->delay = pdata->delay;

 	if (pdata->row_gpios && pdata->col_gpios) {
 		row_gpios = pdata->row_gpios;
 		col_gpios = pdata->col_gpios;
 	}

 	omap_kp->rows = pdata->rows;
 	omap_kp->cols = pdata->cols;

 	if (cpu_is_omap24xx()) {
 		/* Cols: outputs */
 		for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
 			if (omap_request_gpio(col_gpios[col_idx]) < 0) {
 				printk(KERN_ERR "Failed to request"
 				       "GPIO%d for keypad\n",
 				       col_gpios[col_idx]);
 				goto err1;
 			}
 			omap_set_gpio_direction(col_gpios[col_idx], 0);
 		}
 		/* Rows: inputs */
 		for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
 			if (omap_request_gpio(row_gpios[row_idx]) < 0) {
 				printk(KERN_ERR "Failed to request"
 				       "GPIO%d for keypad\n",
 				       row_gpios[row_idx]);
 				goto err2;
 			}
 			omap_set_gpio_direction(row_gpios[row_idx], 1);
 		}
 	}

 	setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);

 	/* get the irq and init timer*/
 	tasklet_enable(&kp_tasklet);
 	kp_tasklet.data = (unsigned long) omap_kp;

 	ret = device_create_file(&pdev->dev, &dev_attr_enable);
 	if (ret < 0)
 		goto err2;

 	/* setup input device */
 	set_bit(EV_KEY, input_dev->evbit);
 	for (i = 0; keymap[i] != 0; i++)
 		set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
 	input_dev->name = "omap-keypad";
 	input_dev->phys = "omap-keypad/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->keycode = keymap;
 	input_dev->keycodesize = sizeof(unsigned int);
 	input_dev->keycodemax = pdata->keymapsize;

 	ret = input_register_device(omap_kp->input);
 	if (ret < 0) {
 		printk(KERN_ERR "Unable to register omap-keypad input device\n");
 		goto err3;
 	}

 	if (pdata->dbounce)
 		omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);

 	/* scan current status and enable interrupt */
 	omap_kp_scan_keypad(omap_kp, keypad_state);
 	if (!cpu_is_omap24xx()) {
 		omap_kp->irq = platform_get_irq(pdev, 0);
 		if (omap_kp->irq >= 0) {
 			if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
 					"omap-keypad", omap_kp) < 0)
 				goto err4;
 		}
 		omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 	} else {
 		for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
 			if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
 				       	omap_kp_interrupt,
 					IRQF_TRIGGER_FALLING,
 				       	"omap-keypad", omap_kp) < 0)
 				goto err5;
 		}
 	}
 	return 0;
 err5:
 	for (i = irq_idx-1; i >=0; i--)
 		free_irq(row_gpios[i], 0);
 err4:
 	input_unregister_device(omap_kp->input);
 	input_dev = NULL;
 err3:
 	device_remove_file(&pdev->dev, &dev_attr_enable);
 err2:
 	for (i = row_idx-1; i >=0; i--)
 		omap_free_gpio(row_gpios[i]);
 err1:
 	for (i = col_idx-1; i >=0; i--)
 		omap_free_gpio(col_gpios[i]);

 	kfree(omap_kp);
 	input_free_device(input_dev);

 	return -EINVAL;
 }

 static int omap_kp_remove(struct platform_device *pdev)
 {
 	struct omap_kp *omap_kp = platform_get_drvdata(pdev);

 	/* disable keypad interrupt handling */
 	tasklet_disable(&kp_tasklet);
 	if (cpu_is_omap24xx()) {
 		int i;
 		for (i = 0; i < omap_kp->cols; i++)
 	    		omap_free_gpio(col_gpios[i]);
 		for (i = 0; i < omap_kp->rows; i++) {
 	    		omap_free_gpio(row_gpios[i]);
 			free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
 		}
 	} else {
 		omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 		free_irq(omap_kp->irq, 0);
 	}

 	del_timer_sync(&omap_kp->timer);
 	tasklet_kill(&kp_tasklet);

 	/* unregister everything */
 	input_unregister_device(omap_kp->input);

 	kfree(omap_kp);

 	return 0;
 }

 static struct platform_driver omap_kp_driver = {
 	.probe		= omap_kp_probe,
 	.remove		= omap_kp_remove,
 	.suspend	= omap_kp_suspend,
 	.resume		= omap_kp_resume,
 	.driver		= {
 		.name	= "omap-keypad",
 	},
 };

 static int __devinit omap_kp_init(void)
 {
 	printk(KERN_INFO "OMAP Keypad Driver\n");
 	return platform_driver_register(&omap_kp_driver);
 }

 static void __exit omap_kp_exit(void)
 {
 	platform_driver_unregister(&omap_kp_driver);
 }

 module_init(omap_kp_init);
 module_exit(omap_kp_exit);

 MODULE_AUTHOR("Timo Teräs");
 MODULE_DESCRIPTION("OMAP Keypad Driver");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/input/keyboard/omap-keypad.c
	*
	* OMAP Keypad Driver
	*
	* Copyright (C) 2003 Nokia Corporation
	* Written by Timo Teräs <ext-timo.teras@nokia.com>
	*
	* Added support for H2 & H3 Keypad
	* Copyright (C) 2004 Texas Instruments
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/types.h>
	#include <linux/input.h>
	#include <linux/kernel.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/mutex.h>
	#include <linux/errno.h>
	#include <asm/arch/gpio.h>
	#include <asm/arch/keypad.h>
	#include <asm/arch/menelaus.h>
	#include <asm/irq.h>
	#include <asm/hardware.h>
	#include <asm/io.h>
	#include <asm/mach-types.h>
	#include <asm/arch/mux.h>

	#undef NEW_BOARD_LEARNING_MODE

	static void omap_kp_tasklet(unsigned long);
	static void omap_kp_timer(unsigned long);

	static unsigned char keypad_state[8];
	static DEFINE_MUTEX(kp_enable_mutex);
	static int kp_enable = 1;
	static int kp_cur_group = -1;

	struct omap_kp {
	struct input_dev *input;
	struct timer_list timer;
	int irq;
	unsigned int rows;
	unsigned int cols;
	unsigned long delay;
	unsigned int debounce;
	};

	DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);

	static int *keymap;
	static unsigned int *row_gpios;
	static unsigned int *col_gpios;

	#ifdef CONFIG_ARCH_OMAP2
	static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
	{
	int col;
	for (col = 0; col < omap_kp->cols; col++) {
	if (value & (1 << col))
	omap_set_gpio_dataout(col_gpios[col], 1);
	else
	omap_set_gpio_dataout(col_gpios[col], 0);
	}
	}

	static u8 get_row_gpio_val(struct omap_kp *omap_kp)
	{
	int row;
	u8 value = 0;

	for (row = 0; row < omap_kp->rows; row++) {
	if (omap_get_gpio_datain(row_gpios[row]))
	value \|= (1 << row);
	}
	return value;
	}
	#else
	#define set_col_gpio_val(x, y) do {} while (0)
	#define get_row_gpio_val(x) 0
	#endif

	static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
	{
	struct omap_kp *omap_kp = dev_id;

	/* disable keyboard interrupt and schedule for handling */
	if (cpu_is_omap24xx()) {
	int i;
	for (i = 0; i < omap_kp->rows; i++)
	disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
	} else
	/* disable keyboard interrupt and schedule for handling */
	omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	tasklet_schedule(&kp_tasklet);

	return IRQ_HANDLED;
	}

	static void omap_kp_timer(unsigned long data)
	{
	tasklet_schedule(&kp_tasklet);
	}

	static void omap_kp_scan_keypad(struct omap_kp omap_kp, unsigned char state)
	{
	int col = 0;

	/* read the keypad status */
	if (cpu_is_omap24xx()) {
	int i;
	for (i = 0; i < omap_kp->rows; i++)
	disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));

	/* read the keypad status */
	for (col = 0; col < omap_kp->cols; col++) {
	set_col_gpio_val(omap_kp, ~(1 << col));
	state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
	}
	set_col_gpio_val(omap_kp, 0);

	} else {
	/* disable keyboard interrupt and schedule for handling */
	omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	/* read the keypad status */
	omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
	for (col = 0; col < omap_kp->cols; col++) {
	omap_writew(~(1 << col) & 0xff,
	OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);

	udelay(omap_kp->delay);

	state[col] = ~omap_readw(OMAP_MPUIO_BASE +
	OMAP_MPUIO_KBR_LATCH) & 0xff;
	}
	omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
	udelay(2);
	}
	}

	static inline int omap_kp_find_key(int col, int row)
	{
	int i, key;

	key = KEY(col, row, 0);
	for (i = 0; keymap[i] != 0; i++)
	if ((keymap[i] & 0xff000000) == key)
	return keymap[i] & 0x00ffffff;
	return -1;
	}

	static void omap_kp_tasklet(unsigned long data)
	{
	struct omap_kp omap_kp_data = (struct omap_kp ) data;
	unsigned char new_state[8], changed, key_down = 0;
	int col, row;
	int spurious = 0;

	/* check for any changes */
	omap_kp_scan_keypad(omap_kp_data, new_state);

	/* check for changes and print those */
	for (col = 0; col < omap_kp_data->cols; col++) {
	changed = new_state[col] ^ keypad_state[col];
	key_down \|= new_state[col];
	if (changed == 0)
	continue;

	for (row = 0; row < omap_kp_data->rows; row++) {
	int key;
	if (!(changed & (1 << row)))
	continue;
	#ifdef NEW_BOARD_LEARNING_MODE
	printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
	row, (new_state[col] & (1 << row)) ?
	"pressed" : "released");
	#else
	key = omap_kp_find_key(col, row);
	if (key < 0) {
	printk(KERN_WARNING
	"omap-keypad: Spurious key event %d-%d\n",
	col, row);
	/* We scan again after a couple of seconds */
	spurious = 1;
	continue;
	}

	if (!(kp_cur_group == (key & GROUP_MASK) \|\|
	kp_cur_group == -1))
	continue;

	kp_cur_group = key & GROUP_MASK;
	input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
	new_state[col] & (1 << row));
	#endif
	}
	}
	memcpy(keypad_state, new_state, sizeof(keypad_state));

	if (key_down) {
	int delay = HZ / 20;
	/* some key is pressed - keep irq disabled and use timer
	* to poll the keypad */
	if (spurious)
	delay = 2 * HZ;
	mod_timer(&omap_kp_data->timer, jiffies + delay);
	} else {
	/* enable interrupts */
	if (cpu_is_omap24xx()) {
	int i;
	for (i = 0; i < omap_kp_data->rows; i++)
	enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
	} else {
	omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
	kp_cur_group = -1;
	}
	}
	}

	static ssize_t omap_kp_enable_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "%u\n", kp_enable);
	}

	static ssize_t omap_kp_enable_store(struct device dev, struct device_attribute attr,
	const char *buf, size_t count)
	{
	int state;

	if (sscanf(buf, "%u", &state) != 1)
	return -EINVAL;

	if ((state != 1) && (state != 0))
	return -EINVAL;

	mutex_lock(&kp_enable_mutex);
	if (state != kp_enable) {
	if (state)
	enable_irq(INT_KEYBOARD);
	else
	disable_irq(INT_KEYBOARD);
	kp_enable = state;
	}
	mutex_unlock(&kp_enable_mutex);

	return strnlen(buf, count);
	}

	static DEVICE_ATTR(enable, S_IRUGO \| S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);

	#ifdef CONFIG_PM
	static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
	{
	/* Nothing yet */

	return 0;
	}

	static int omap_kp_resume(struct platform_device *dev)
	{
	/* Nothing yet */

	return 0;
	}
	#else
	#define omap_kp_suspend NULL
	#define omap_kp_resume NULL
	#endif

	static int __init omap_kp_probe(struct platform_device *pdev)
	{
	struct omap_kp *omap_kp;
	struct input_dev *input_dev;
	struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
	int i, col_idx, row_idx, irq_idx, ret;

	if (!pdata->rows \|\| !pdata->cols \|\| !pdata->keymap) {
	printk(KERN_ERR "No rows, cols or keymap from pdata\n");
	return -EINVAL;
	}

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

	platform_set_drvdata(pdev, omap_kp);

	omap_kp->input = input_dev;

	/* Disable the interrupt for the MPUIO keyboard */
	if (!cpu_is_omap24xx())
	omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	keymap = pdata->keymap;

	if (pdata->rep)
	set_bit(EV_REP, input_dev->evbit);

	if (pdata->delay)
	omap_kp->delay = pdata->delay;

	if (pdata->row_gpios && pdata->col_gpios) {
	row_gpios = pdata->row_gpios;
	col_gpios = pdata->col_gpios;
	}

	omap_kp->rows = pdata->rows;
	omap_kp->cols = pdata->cols;

	if (cpu_is_omap24xx()) {
	/* Cols: outputs */
	for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
	if (omap_request_gpio(col_gpios[col_idx]) < 0) {
	printk(KERN_ERR "Failed to request"
	"GPIO%d for keypad\n",
	col_gpios[col_idx]);
	goto err1;
	}
	omap_set_gpio_direction(col_gpios[col_idx], 0);
	}
	/* Rows: inputs */
	for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
	if (omap_request_gpio(row_gpios[row_idx]) < 0) {
	printk(KERN_ERR "Failed to request"
	"GPIO%d for keypad\n",
	row_gpios[row_idx]);
	goto err2;
	}
	omap_set_gpio_direction(row_gpios[row_idx], 1);
	}
	}

	setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);

	/* get the irq and init timer*/
	tasklet_enable(&kp_tasklet);
	kp_tasklet.data = (unsigned long) omap_kp;

	ret = device_create_file(&pdev->dev, &dev_attr_enable);
	if (ret < 0)
	goto err2;

	/* setup input device */
	set_bit(EV_KEY, input_dev->evbit);
	for (i = 0; keymap[i] != 0; i++)
	set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
	input_dev->name = "omap-keypad";
	input_dev->phys = "omap-keypad/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->keycode = keymap;
	input_dev->keycodesize = sizeof(unsigned int);
	input_dev->keycodemax = pdata->keymapsize;

	ret = input_register_device(omap_kp->input);
	if (ret < 0) {
	printk(KERN_ERR "Unable to register omap-keypad input device\n");
	goto err3;
	}

	if (pdata->dbounce)
	omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);

	/* scan current status and enable interrupt */
	omap_kp_scan_keypad(omap_kp, keypad_state);
	if (!cpu_is_omap24xx()) {
	omap_kp->irq = platform_get_irq(pdev, 0);
	if (omap_kp->irq >= 0) {
	if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
	"omap-keypad", omap_kp) < 0)
	goto err4;
	}
	omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
	} else {
	for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
	if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
	omap_kp_interrupt,
	IRQF_TRIGGER_FALLING,
	"omap-keypad", omap_kp) < 0)
	goto err5;
	}
	}
	return 0;
	err5:
	for (i = irq_idx-1; i >=0; i--)
	free_irq(row_gpios[i], 0);
	err4:
	input_unregister_device(omap_kp->input);
	input_dev = NULL;
	err3:
	device_remove_file(&pdev->dev, &dev_attr_enable);
	err2:
	for (i = row_idx-1; i >=0; i--)
	omap_free_gpio(row_gpios[i]);
	err1:
	for (i = col_idx-1; i >=0; i--)
	omap_free_gpio(col_gpios[i]);

	kfree(omap_kp);
	input_free_device(input_dev);

	return -EINVAL;
	}

	static int omap_kp_remove(struct platform_device *pdev)
	{
	struct omap_kp *omap_kp = platform_get_drvdata(pdev);

	/* disable keypad interrupt handling */
	tasklet_disable(&kp_tasklet);
	if (cpu_is_omap24xx()) {
	int i;
	for (i = 0; i < omap_kp->cols; i++)
	omap_free_gpio(col_gpios[i]);
	for (i = 0; i < omap_kp->rows; i++) {
	omap_free_gpio(row_gpios[i]);
	free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
	}
	} else {
	omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
	free_irq(omap_kp->irq, 0);
	}

	del_timer_sync(&omap_kp->timer);
	tasklet_kill(&kp_tasklet);

	/* unregister everything */
	input_unregister_device(omap_kp->input);

	kfree(omap_kp);

	return 0;
	}

	static struct platform_driver omap_kp_driver = {
	.probe = omap_kp_probe,
	.remove = omap_kp_remove,
	.suspend = omap_kp_suspend,
	.resume = omap_kp_resume,
	.driver = {
	.name = "omap-keypad",
	},
	};

	static int __devinit omap_kp_init(void)
	{
	printk(KERN_INFO "OMAP Keypad Driver\n");
	return platform_driver_register(&omap_kp_driver);
	}

	static void __exit omap_kp_exit(void)
	{
	platform_driver_unregister(&omap_kp_driver);
	}

	module_init(omap_kp_init);
	module_exit(omap_kp_exit);

	MODULE_AUTHOR("Timo Teräs");
	MODULE_DESCRIPTION("OMAP Keypad Driver");
	MODULE_LICENSE("GPL");