drivers/input/keyboard/davinci_keyscan.c - linux-imx - Git at Google

 /*
  * DaVinci Key Scan Driver for TI platforms
  *
  * Copyright (C) 2009 Texas Instruments, Inc
  *
  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
  *
  * Initial Code: Sandeep Paulraj <s-paulraj@ti.com>
  *
  * 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/errno.h>
 #include <linux/slab.h>

 #include <asm/irq.h>

 #include <mach/hardware.h>
 #include <mach/irqs.h>
 #include <linux/platform_data/keyscan-davinci.h>

 /* Key scan registers */
 #define DAVINCI_KEYSCAN_KEYCTRL		0x0000
 #define DAVINCI_KEYSCAN_INTENA		0x0004
 #define DAVINCI_KEYSCAN_INTFLAG		0x0008
 #define DAVINCI_KEYSCAN_INTCLR		0x000c
 #define DAVINCI_KEYSCAN_STRBWIDTH	0x0010
 #define DAVINCI_KEYSCAN_INTERVAL	0x0014
 #define DAVINCI_KEYSCAN_CONTTIME	0x0018
 #define DAVINCI_KEYSCAN_CURRENTST	0x001c
 #define DAVINCI_KEYSCAN_PREVSTATE	0x0020
 #define DAVINCI_KEYSCAN_EMUCTRL		0x0024
 #define DAVINCI_KEYSCAN_IODFTCTRL	0x002c

 /* Key Control Register (KEYCTRL) */
 #define DAVINCI_KEYSCAN_KEYEN		0x00000001
 #define DAVINCI_KEYSCAN_PREVMODE	0x00000002
 #define DAVINCI_KEYSCAN_CHATOFF		0x00000004
 #define DAVINCI_KEYSCAN_AUTODET		0x00000008
 #define DAVINCI_KEYSCAN_SCANMODE	0x00000010
 #define DAVINCI_KEYSCAN_OUTTYPE		0x00000020

 /* Masks for the interrupts */
 #define DAVINCI_KEYSCAN_INT_CONT	0x00000008
 #define DAVINCI_KEYSCAN_INT_OFF		0x00000004
 #define DAVINCI_KEYSCAN_INT_ON		0x00000002
 #define DAVINCI_KEYSCAN_INT_CHANGE	0x00000001
 #define DAVINCI_KEYSCAN_INT_ALL		0x0000000f

 struct davinci_ks {
 	struct input_dev		*input;
 	struct davinci_ks_platform_data	*pdata;
 	int				irq;
 	void __iomem			*base;
 	resource_size_t			pbase;
 	size_t				base_size;
 	unsigned short			keymap[];
 };

 /* Initializing the kp Module */
 static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
 {
 	struct device *dev = &davinci_ks->input->dev;
 	struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
 	u32 matrix_ctrl;

 	/* Enable all interrupts */
 	__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
 		     davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

 	/* Clear interrupts if any */
 	__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
 		     davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);

 	/* Setup the scan period = strobe + interval */
 	__raw_writel(pdata->strobe,
 		     davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
 	__raw_writel(pdata->interval,
 		     davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
 	__raw_writel(0x01,
 		     davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);

 	/* Define matrix type */
 	switch (pdata->matrix_type) {
 	case DAVINCI_KEYSCAN_MATRIX_4X4:
 		matrix_ctrl = 0;
 		break;
 	case DAVINCI_KEYSCAN_MATRIX_5X3:
 		matrix_ctrl = (1 << 6);
 		break;
 	default:
 		dev_err(dev->parent, "wrong matrix type\n");
 		return -EINVAL;
 	}

 	/* Enable key scan module and set matrix type */
 	__raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
 		     matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);

 	return 0;
 }

 static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
 {
 	struct davinci_ks *davinci_ks = dev_id;
 	struct device *dev = &davinci_ks->input->dev;
 	unsigned short *keymap = davinci_ks->keymap;
 	int keymapsize = davinci_ks->pdata->keymapsize;
 	u32 prev_status, new_status, changed;
 	bool release;
 	int keycode = KEY_UNKNOWN;
 	int i;

 	/* Disable interrupt */
 	__raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

 	/* Reading previous and new status of the key scan */
 	prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
 	new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);

 	changed = prev_status ^ new_status;

 	if (changed) {
 		/*
 		 * It goes through all bits in 'changed' to ensure
 		 * that no key changes are being missed
 		 */
 		for (i = 0 ; i < keymapsize; i++) {
 			if ((changed>>i) & 0x1) {
 				keycode = keymap[i];
 				release = (new_status >> i) & 0x1;
 				dev_dbg(dev->parent, "key %d %s\n", keycode,
 					release ? "released" : "pressed");
 				input_report_key(davinci_ks->input, keycode,
 						 !release);
 				input_sync(davinci_ks->input);
 			}
 		}
 		/* Clearing interrupt */
 		__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
 			     davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
 	}

 	/* Enable interrupts */
 	__raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

 	return IRQ_HANDLED;
 }

 static int __init davinci_ks_probe(struct platform_device *pdev)
 {
 	struct davinci_ks *davinci_ks;
 	struct input_dev *key_dev;
 	struct resource *res, *mem;
 	struct device *dev = &pdev->dev;
 	struct davinci_ks_platform_data *pdata = pdev->dev.platform_data;
 	int error, i;

 	if (pdata->device_enable) {
 		error = pdata->device_enable(dev);
 		if (error < 0) {
 			dev_dbg(dev, "device enable function failed\n");
 			return error;
 		}
 	}

 	if (!pdata->keymap) {
 		dev_dbg(dev, "no keymap from pdata\n");
 		return -EINVAL;
 	}

 	davinci_ks = kzalloc(sizeof(struct davinci_ks) +
 		sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
 	if (!davinci_ks) {
 		dev_dbg(dev, "could not allocate memory for private data\n");
 		return -ENOMEM;
 	}

 	memcpy(davinci_ks->keymap, pdata->keymap,
 		sizeof(unsigned short) * pdata->keymapsize);

 	key_dev = input_allocate_device();
 	if (!key_dev) {
 		dev_dbg(dev, "could not allocate input device\n");
 		error = -ENOMEM;
 		goto fail1;
 	}

 	davinci_ks->input = key_dev;

 	davinci_ks->irq = platform_get_irq(pdev, 0);
 	if (davinci_ks->irq < 0) {
 		dev_err(dev, "no key scan irq\n");
 		error = davinci_ks->irq;
 		goto fail2;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "no mem resource\n");
 		error = -EINVAL;
 		goto fail2;
 	}

 	davinci_ks->pbase = res->start;
 	davinci_ks->base_size = resource_size(res);

 	mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
 				 pdev->name);
 	if (!mem) {
 		dev_err(dev, "key scan registers at %08x are not free\n",
 			davinci_ks->pbase);
 		error = -EBUSY;
 		goto fail2;
 	}

 	davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
 	if (!davinci_ks->base) {
 		dev_err(dev, "can't ioremap MEM resource.\n");
 		error = -ENOMEM;
 		goto fail3;
 	}

 	/* Enable auto repeat feature of Linux input subsystem */
 	if (pdata->rep)
 		__set_bit(EV_REP, key_dev->evbit);

 	/* Setup input device */
 	__set_bit(EV_KEY, key_dev->evbit);

 	/* Setup the platform data */
 	davinci_ks->pdata = pdata;

 	for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
 		__set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);

 	key_dev->name = "davinci_keyscan";
 	key_dev->phys = "davinci_keyscan/input0";
 	key_dev->dev.parent = &pdev->dev;
 	key_dev->id.bustype = BUS_HOST;
 	key_dev->id.vendor = 0x0001;
 	key_dev->id.product = 0x0001;
 	key_dev->id.version = 0x0001;
 	key_dev->keycode = davinci_ks->keymap;
 	key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
 	key_dev->keycodemax = davinci_ks->pdata->keymapsize;

 	error = input_register_device(davinci_ks->input);
 	if (error < 0) {
 		dev_err(dev, "unable to register davinci key scan device\n");
 		goto fail4;
 	}

 	error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
 			  0, pdev->name, davinci_ks);
 	if (error < 0) {
 		dev_err(dev, "unable to register davinci key scan interrupt\n");
 		goto fail5;
 	}

 	error = davinci_ks_initialize(davinci_ks);
 	if (error < 0) {
 		dev_err(dev, "unable to initialize davinci key scan device\n");
 		goto fail6;
 	}

 	platform_set_drvdata(pdev, davinci_ks);
 	return 0;

 fail6:
 	free_irq(davinci_ks->irq, davinci_ks);
 fail5:
 	input_unregister_device(davinci_ks->input);
 	key_dev = NULL;
 fail4:
 	iounmap(davinci_ks->base);
 fail3:
 	release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
 fail2:
 	input_free_device(key_dev);
 fail1:
 	kfree(davinci_ks);

 	return error;
 }

 static int davinci_ks_remove(struct platform_device *pdev)
 {
 	struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);

 	free_irq(davinci_ks->irq, davinci_ks);

 	input_unregister_device(davinci_ks->input);

 	iounmap(davinci_ks->base);
 	release_mem_region(davinci_ks->pbase, davinci_ks->base_size);

 	platform_set_drvdata(pdev, NULL);

 	kfree(davinci_ks);

 	return 0;
 }

 static struct platform_driver davinci_ks_driver = {
 	.driver	= {
 		.name = "davinci_keyscan",
 		.owner = THIS_MODULE,
 	},
 	.remove	= davinci_ks_remove,
 };

 static int __init davinci_ks_init(void)
 {
 	return platform_driver_probe(&davinci_ks_driver, davinci_ks_probe);
 }
 module_init(davinci_ks_init);

 static void __exit davinci_ks_exit(void)
 {
 	platform_driver_unregister(&davinci_ks_driver);
 }
 module_exit(davinci_ks_exit);

 MODULE_AUTHOR("Miguel Aguilar");
 MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
 MODULE_LICENSE("GPL");
	/*
	* DaVinci Key Scan Driver for TI platforms
	*
	* Copyright (C) 2009 Texas Instruments, Inc
	*
	* Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
	*
	* Initial Code: Sandeep Paulraj <s-paulraj@ti.com>
	*
	* 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/errno.h>
	#include <linux/slab.h>

	#include <asm/irq.h>

	#include <mach/hardware.h>
	#include <mach/irqs.h>
	#include <linux/platform_data/keyscan-davinci.h>

	/* Key scan registers */
	#define DAVINCI_KEYSCAN_KEYCTRL 0x0000
	#define DAVINCI_KEYSCAN_INTENA 0x0004
	#define DAVINCI_KEYSCAN_INTFLAG 0x0008
	#define DAVINCI_KEYSCAN_INTCLR 0x000c
	#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010
	#define DAVINCI_KEYSCAN_INTERVAL 0x0014
	#define DAVINCI_KEYSCAN_CONTTIME 0x0018
	#define DAVINCI_KEYSCAN_CURRENTST 0x001c
	#define DAVINCI_KEYSCAN_PREVSTATE 0x0020
	#define DAVINCI_KEYSCAN_EMUCTRL 0x0024
	#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c

	/* Key Control Register (KEYCTRL) */
	#define DAVINCI_KEYSCAN_KEYEN 0x00000001
	#define DAVINCI_KEYSCAN_PREVMODE 0x00000002
	#define DAVINCI_KEYSCAN_CHATOFF 0x00000004
	#define DAVINCI_KEYSCAN_AUTODET 0x00000008
	#define DAVINCI_KEYSCAN_SCANMODE 0x00000010
	#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020

	/* Masks for the interrupts */
	#define DAVINCI_KEYSCAN_INT_CONT 0x00000008
	#define DAVINCI_KEYSCAN_INT_OFF 0x00000004
	#define DAVINCI_KEYSCAN_INT_ON 0x00000002
	#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001
	#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f

	struct davinci_ks {
	struct input_dev *input;
	struct davinci_ks_platform_data *pdata;
	int irq;
	void __iomem *base;
	resource_size_t pbase;
	size_t base_size;
	unsigned short keymap[];
	};

	/* Initializing the kp Module */
	static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
	{
	struct device *dev = &davinci_ks->input->dev;
	struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
	u32 matrix_ctrl;

	/* Enable all interrupts */
	__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
	davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

	/* Clear interrupts if any */
	__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
	davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);

	/* Setup the scan period = strobe + interval */
	__raw_writel(pdata->strobe,
	davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
	__raw_writel(pdata->interval,
	davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
	__raw_writel(0x01,
	davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);

	/* Define matrix type */
	switch (pdata->matrix_type) {
	case DAVINCI_KEYSCAN_MATRIX_4X4:
	matrix_ctrl = 0;
	break;
	case DAVINCI_KEYSCAN_MATRIX_5X3:
	matrix_ctrl = (1 << 6);
	break;
	default:
	dev_err(dev->parent, "wrong matrix type\n");
	return -EINVAL;
	}

	/* Enable key scan module and set matrix type */
	__raw_writel(DAVINCI_KEYSCAN_AUTODET \| DAVINCI_KEYSCAN_KEYEN \|
	matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);

	return 0;
	}

	static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
	{
	struct davinci_ks *davinci_ks = dev_id;
	struct device *dev = &davinci_ks->input->dev;
	unsigned short *keymap = davinci_ks->keymap;
	int keymapsize = davinci_ks->pdata->keymapsize;
	u32 prev_status, new_status, changed;
	bool release;
	int keycode = KEY_UNKNOWN;
	int i;

	/* Disable interrupt */
	__raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

	/* Reading previous and new status of the key scan */
	prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
	new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);

	changed = prev_status ^ new_status;

	if (changed) {
	/*
	* It goes through all bits in 'changed' to ensure
	* that no key changes are being missed
	*/
	for (i = 0 ; i < keymapsize; i++) {
	if ((changed>>i) & 0x1) {
	keycode = keymap[i];
	release = (new_status >> i) & 0x1;
	dev_dbg(dev->parent, "key %d %s\n", keycode,
	release ? "released" : "pressed");
	input_report_key(davinci_ks->input, keycode,
	!release);
	input_sync(davinci_ks->input);
	}
	}
	/* Clearing interrupt */
	__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
	davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
	}

	/* Enable interrupts */
	__raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);

	return IRQ_HANDLED;
	}

	static int __init davinci_ks_probe(struct platform_device *pdev)
	{
	struct davinci_ks *davinci_ks;
	struct input_dev *key_dev;
	struct resource res, mem;
	struct device *dev = &pdev->dev;
	struct davinci_ks_platform_data *pdata = pdev->dev.platform_data;
	int error, i;

	if (pdata->device_enable) {
	error = pdata->device_enable(dev);
	if (error < 0) {
	dev_dbg(dev, "device enable function failed\n");
	return error;
	}
	}

	if (!pdata->keymap) {
	dev_dbg(dev, "no keymap from pdata\n");
	return -EINVAL;
	}

	davinci_ks = kzalloc(sizeof(struct davinci_ks) +
	sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
	if (!davinci_ks) {
	dev_dbg(dev, "could not allocate memory for private data\n");
	return -ENOMEM;
	}

	memcpy(davinci_ks->keymap, pdata->keymap,
	sizeof(unsigned short) * pdata->keymapsize);

	key_dev = input_allocate_device();
	if (!key_dev) {
	dev_dbg(dev, "could not allocate input device\n");
	error = -ENOMEM;
	goto fail1;
	}

	davinci_ks->input = key_dev;

	davinci_ks->irq = platform_get_irq(pdev, 0);
	if (davinci_ks->irq < 0) {
	dev_err(dev, "no key scan irq\n");
	error = davinci_ks->irq;
	goto fail2;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(dev, "no mem resource\n");
	error = -EINVAL;
	goto fail2;
	}

	davinci_ks->pbase = res->start;
	davinci_ks->base_size = resource_size(res);

	mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
	pdev->name);
	if (!mem) {
	dev_err(dev, "key scan registers at %08x are not free\n",
	davinci_ks->pbase);
	error = -EBUSY;
	goto fail2;
	}

	davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
	if (!davinci_ks->base) {
	dev_err(dev, "can't ioremap MEM resource.\n");
	error = -ENOMEM;
	goto fail3;
	}

	/* Enable auto repeat feature of Linux input subsystem */
	if (pdata->rep)
	__set_bit(EV_REP, key_dev->evbit);

	/* Setup input device */
	__set_bit(EV_KEY, key_dev->evbit);

	/* Setup the platform data */
	davinci_ks->pdata = pdata;

	for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
	__set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);

	key_dev->name = "davinci_keyscan";
	key_dev->phys = "davinci_keyscan/input0";
	key_dev->dev.parent = &pdev->dev;
	key_dev->id.bustype = BUS_HOST;
	key_dev->id.vendor = 0x0001;
	key_dev->id.product = 0x0001;
	key_dev->id.version = 0x0001;
	key_dev->keycode = davinci_ks->keymap;
	key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
	key_dev->keycodemax = davinci_ks->pdata->keymapsize;

	error = input_register_device(davinci_ks->input);
	if (error < 0) {
	dev_err(dev, "unable to register davinci key scan device\n");
	goto fail4;
	}

	error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
	0, pdev->name, davinci_ks);
	if (error < 0) {
	dev_err(dev, "unable to register davinci key scan interrupt\n");
	goto fail5;
	}

	error = davinci_ks_initialize(davinci_ks);
	if (error < 0) {
	dev_err(dev, "unable to initialize davinci key scan device\n");
	goto fail6;
	}

	platform_set_drvdata(pdev, davinci_ks);
	return 0;

	fail6:
	free_irq(davinci_ks->irq, davinci_ks);
	fail5:
	input_unregister_device(davinci_ks->input);
	key_dev = NULL;
	fail4:
	iounmap(davinci_ks->base);
	fail3:
	release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
	fail2:
	input_free_device(key_dev);
	fail1:
	kfree(davinci_ks);

	return error;
	}

	static int davinci_ks_remove(struct platform_device *pdev)
	{
	struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);

	free_irq(davinci_ks->irq, davinci_ks);

	input_unregister_device(davinci_ks->input);

	iounmap(davinci_ks->base);
	release_mem_region(davinci_ks->pbase, davinci_ks->base_size);

	platform_set_drvdata(pdev, NULL);

	kfree(davinci_ks);

	return 0;
	}

	static struct platform_driver davinci_ks_driver = {
	.driver = {
	.name = "davinci_keyscan",
	.owner = THIS_MODULE,
	},
	.remove = davinci_ks_remove,
	};

	static int __init davinci_ks_init(void)
	{
	return platform_driver_probe(&davinci_ks_driver, davinci_ks_probe);
	}
	module_init(davinci_ks_init);

	static void __exit davinci_ks_exit(void)
	{
	platform_driver_unregister(&davinci_ks_driver);
	}
	module_exit(davinci_ks_exit);

	MODULE_AUTHOR("Miguel Aguilar");
	MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
	MODULE_LICENSE("GPL");