drivers/input/keyboard/ep93xx_keypad.c - kernel/msm-5.4 - Gitiles

 /*
  * Driver for the Cirrus EP93xx matrix keypad controller.
  *
  * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
  *
  * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
  *
  * 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.
  *
  * NOTE:
  *
  * The 3-key reset is triggered by pressing the 3 keys in
  * Row 0, Columns 2, 4, and 7 at the same time.  This action can
  * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
  *
  * Normal operation for the matrix does not autorepeat the key press.
  * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
  * flag.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/input/matrix_keypad.h>
 #include <linux/slab.h>

 #include <mach/hardware.h>
 #include <linux/platform_data/keypad-ep93xx.h>

 /*
  * Keypad Interface Register offsets
  */
 #define KEY_INIT		0x00	/* Key Scan Initialization register */
 #define KEY_DIAG		0x04	/* Key Scan Diagnostic register */
 #define KEY_REG			0x08	/* Key Value Capture register */

 /* Key Scan Initialization Register bit defines */
 #define KEY_INIT_DBNC_MASK	(0x00ff0000)
 #define KEY_INIT_DBNC_SHIFT	(16)
 #define KEY_INIT_DIS3KY		(1<<15)
 #define KEY_INIT_DIAG		(1<<14)
 #define KEY_INIT_BACK		(1<<13)
 #define KEY_INIT_T2		(1<<12)
 #define KEY_INIT_PRSCL_MASK	(0x000003ff)
 #define KEY_INIT_PRSCL_SHIFT	(0)

 /* Key Scan Diagnostic Register bit defines */
 #define KEY_DIAG_MASK		(0x0000003f)
 #define KEY_DIAG_SHIFT		(0)

 /* Key Value Capture Register bit defines */
 #define KEY_REG_K		(1<<15)
 #define KEY_REG_INT		(1<<14)
 #define KEY_REG_2KEYS		(1<<13)
 #define KEY_REG_1KEY		(1<<12)
 #define KEY_REG_KEY2_MASK	(0x00000fc0)
 #define KEY_REG_KEY2_SHIFT	(6)
 #define KEY_REG_KEY1_MASK	(0x0000003f)
 #define KEY_REG_KEY1_SHIFT	(0)

 #define EP93XX_MATRIX_SIZE	(EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)

 struct ep93xx_keypad {
 	struct ep93xx_keypad_platform_data *pdata;
 	struct input_dev *input_dev;
 	struct clk *clk;

 	void __iomem *mmio_base;

 	unsigned short keycodes[EP93XX_MATRIX_SIZE];

 	int key1;
 	int key2;

 	int irq;

 	bool enabled;
 };

 static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
 {
 	struct ep93xx_keypad *keypad = dev_id;
 	struct input_dev *input_dev = keypad->input_dev;
 	unsigned int status;
 	int keycode, key1, key2;

 	status = __raw_readl(keypad->mmio_base + KEY_REG);

 	keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
 	key1 = keypad->keycodes[keycode];

 	keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
 	key2 = keypad->keycodes[keycode];

 	if (status & KEY_REG_2KEYS) {
 		if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
 			input_report_key(input_dev, keypad->key1, 0);

 		if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
 			input_report_key(input_dev, keypad->key2, 0);

 		input_report_key(input_dev, key1, 1);
 		input_report_key(input_dev, key2, 1);

 		keypad->key1 = key1;
 		keypad->key2 = key2;

 	} else if (status & KEY_REG_1KEY) {
 		if (keypad->key1 && key1 != keypad->key1)
 			input_report_key(input_dev, keypad->key1, 0);

 		if (keypad->key2 && key1 != keypad->key2)
 			input_report_key(input_dev, keypad->key2, 0);

 		input_report_key(input_dev, key1, 1);

 		keypad->key1 = key1;
 		keypad->key2 = 0;

 	} else {
 		input_report_key(input_dev, keypad->key1, 0);
 		input_report_key(input_dev, keypad->key2, 0);

 		keypad->key1 = keypad->key2 = 0;
 	}
 	input_sync(input_dev);

 	return IRQ_HANDLED;
 }

 static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
 {
 	struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
 	unsigned int val = 0;

 	if (pdata->flags & EP93XX_KEYPAD_KDIV)
 		clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
 	else
 		clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);

 	if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
 		val |= KEY_INIT_DIS3KY;
 	if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
 		val |= KEY_INIT_DIAG;
 	if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
 		val |= KEY_INIT_BACK;
 	if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
 		val |= KEY_INIT_T2;

 	val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);

 	val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);

 	__raw_writel(val, keypad->mmio_base + KEY_INIT);
 }

 static int ep93xx_keypad_open(struct input_dev *pdev)
 {
 	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

 	if (!keypad->enabled) {
 		ep93xx_keypad_config(keypad);
 		clk_enable(keypad->clk);
 		keypad->enabled = true;
 	}

 	return 0;
 }

 static void ep93xx_keypad_close(struct input_dev *pdev)
 {
 	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

 	if (keypad->enabled) {
 		clk_disable(keypad->clk);
 		keypad->enabled = false;
 	}
 }


 #ifdef CONFIG_PM_SLEEP
 static int ep93xx_keypad_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = keypad->input_dev;

 	mutex_lock(&input_dev->mutex);

 	if (keypad->enabled) {
 		clk_disable(keypad->clk);
 		keypad->enabled = false;
 	}

 	mutex_unlock(&input_dev->mutex);

 	if (device_may_wakeup(&pdev->dev))
 		enable_irq_wake(keypad->irq);

 	return 0;
 }

 static int ep93xx_keypad_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = keypad->input_dev;

 	if (device_may_wakeup(&pdev->dev))
 		disable_irq_wake(keypad->irq);

 	mutex_lock(&input_dev->mutex);

 	if (input_dev->users) {
 		if (!keypad->enabled) {
 			ep93xx_keypad_config(keypad);
 			clk_enable(keypad->clk);
 			keypad->enabled = true;
 		}
 	}

 	mutex_unlock(&input_dev->mutex);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
 			 ep93xx_keypad_suspend, ep93xx_keypad_resume);

 static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
 {
 	struct ep93xx_keypad *keypad;
 	const struct matrix_keymap_data *keymap_data;
 	struct input_dev *input_dev;
 	struct resource *res;
 	int err;

 	keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
 	if (!keypad)
 		return -ENOMEM;

 	keypad->pdata = pdev->dev.platform_data;
 	if (!keypad->pdata) {
 		err = -EINVAL;
 		goto failed_free;
 	}

 	keymap_data = keypad->pdata->keymap_data;
 	if (!keymap_data) {
 		err = -EINVAL;
 		goto failed_free;
 	}

 	keypad->irq = platform_get_irq(pdev, 0);
 	if (!keypad->irq) {
 		err = -ENXIO;
 		goto failed_free;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		err = -ENXIO;
 		goto failed_free;
 	}

 	res = request_mem_region(res->start, resource_size(res), pdev->name);
 	if (!res) {
 		err = -EBUSY;
 		goto failed_free;
 	}

 	keypad->mmio_base = ioremap(res->start, resource_size(res));
 	if (keypad->mmio_base == NULL) {
 		err = -ENXIO;
 		goto failed_free_mem;
 	}

 	err = ep93xx_keypad_acquire_gpio(pdev);
 	if (err)
 		goto failed_free_io;

 	keypad->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(keypad->clk)) {
 		err = PTR_ERR(keypad->clk);
 		goto failed_free_gpio;
 	}

 	input_dev = input_allocate_device();
 	if (!input_dev) {
 		err = -ENOMEM;
 		goto failed_put_clk;
 	}

 	keypad->input_dev = input_dev;

 	input_dev->name = pdev->name;
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->open = ep93xx_keypad_open;
 	input_dev->close = ep93xx_keypad_close;
 	input_dev->dev.parent = &pdev->dev;

 	err = matrix_keypad_build_keymap(keymap_data, NULL,
 					 EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
 					 keypad->keycodes, input_dev);
 	if (err)
 		goto failed_free_dev;

 	if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
 		__set_bit(EV_REP, input_dev->evbit);
 	input_set_drvdata(input_dev, keypad);

 	err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
 			  0, pdev->name, keypad);
 	if (err)
 		goto failed_free_dev;

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

 	platform_set_drvdata(pdev, keypad);
 	device_init_wakeup(&pdev->dev, 1);

 	return 0;

 failed_free_irq:
 	free_irq(keypad->irq, pdev);
 	platform_set_drvdata(pdev, NULL);
 failed_free_dev:
 	input_free_device(input_dev);
 failed_put_clk:
 	clk_put(keypad->clk);
 failed_free_gpio:
 	ep93xx_keypad_release_gpio(pdev);
 failed_free_io:
 	iounmap(keypad->mmio_base);
 failed_free_mem:
 	release_mem_region(res->start, resource_size(res));
 failed_free:
 	kfree(keypad);
 	return err;
 }

 static int __devexit ep93xx_keypad_remove(struct platform_device *pdev)
 {
 	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 	struct resource *res;

 	free_irq(keypad->irq, pdev);

 	platform_set_drvdata(pdev, NULL);

 	if (keypad->enabled)
 		clk_disable(keypad->clk);
 	clk_put(keypad->clk);

 	input_unregister_device(keypad->input_dev);

 	ep93xx_keypad_release_gpio(pdev);

 	iounmap(keypad->mmio_base);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));

 	kfree(keypad);

 	return 0;
 }

 static struct platform_driver ep93xx_keypad_driver = {
 	.driver		= {
 		.name	= "ep93xx-keypad",
 		.owner	= THIS_MODULE,
 		.pm	= &ep93xx_keypad_pm_ops,
 	},
 	.probe		= ep93xx_keypad_probe,
 	.remove		= ep93xx_keypad_remove,
 };
 module_platform_driver(ep93xx_keypad_driver);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
 MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
 MODULE_ALIAS("platform:ep93xx-keypad");
	/*
	* Driver for the Cirrus EP93xx matrix keypad controller.
	*
	* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
	*
	* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
	*
	* 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.
	*
	* NOTE:
	*
	* The 3-key reset is triggered by pressing the 3 keys in
	* Row 0, Columns 2, 4, and 7 at the same time. This action can
	* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
	*
	* Normal operation for the matrix does not autorepeat the key press.
	* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
	* flag.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/input/matrix_keypad.h>
	#include <linux/slab.h>

	#include <mach/hardware.h>
	#include <linux/platform_data/keypad-ep93xx.h>

	/*
	* Keypad Interface Register offsets
	*/
	#define KEY_INIT 0x00 /* Key Scan Initialization register */
	#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
	#define KEY_REG 0x08 /* Key Value Capture register */

	/* Key Scan Initialization Register bit defines */
	#define KEY_INIT_DBNC_MASK (0x00ff0000)
	#define KEY_INIT_DBNC_SHIFT (16)
	#define KEY_INIT_DIS3KY (1<<15)
	#define KEY_INIT_DIAG (1<<14)
	#define KEY_INIT_BACK (1<<13)
	#define KEY_INIT_T2 (1<<12)
	#define KEY_INIT_PRSCL_MASK (0x000003ff)
	#define KEY_INIT_PRSCL_SHIFT (0)

	/* Key Scan Diagnostic Register bit defines */
	#define KEY_DIAG_MASK (0x0000003f)
	#define KEY_DIAG_SHIFT (0)

	/* Key Value Capture Register bit defines */
	#define KEY_REG_K (1<<15)
	#define KEY_REG_INT (1<<14)
	#define KEY_REG_2KEYS (1<<13)
	#define KEY_REG_1KEY (1<<12)
	#define KEY_REG_KEY2_MASK (0x00000fc0)
	#define KEY_REG_KEY2_SHIFT (6)
	#define KEY_REG_KEY1_MASK (0x0000003f)
	#define KEY_REG_KEY1_SHIFT (0)

	#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)

	struct ep93xx_keypad {
	struct ep93xx_keypad_platform_data *pdata;
	struct input_dev *input_dev;
	struct clk *clk;

	void __iomem *mmio_base;

	unsigned short keycodes[EP93XX_MATRIX_SIZE];

	int key1;
	int key2;

	int irq;

	bool enabled;
	};

	static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
	{
	struct ep93xx_keypad *keypad = dev_id;
	struct input_dev *input_dev = keypad->input_dev;
	unsigned int status;
	int keycode, key1, key2;

	status = __raw_readl(keypad->mmio_base + KEY_REG);

	keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
	key1 = keypad->keycodes[keycode];

	keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
	key2 = keypad->keycodes[keycode];

	if (status & KEY_REG_2KEYS) {
	if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
	input_report_key(input_dev, keypad->key1, 0);

	if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
	input_report_key(input_dev, keypad->key2, 0);

	input_report_key(input_dev, key1, 1);
	input_report_key(input_dev, key2, 1);

	keypad->key1 = key1;
	keypad->key2 = key2;

	} else if (status & KEY_REG_1KEY) {
	if (keypad->key1 && key1 != keypad->key1)
	input_report_key(input_dev, keypad->key1, 0);

	if (keypad->key2 && key1 != keypad->key2)
	input_report_key(input_dev, keypad->key2, 0);

	input_report_key(input_dev, key1, 1);

	keypad->key1 = key1;
	keypad->key2 = 0;

	} else {
	input_report_key(input_dev, keypad->key1, 0);
	input_report_key(input_dev, keypad->key2, 0);

	keypad->key1 = keypad->key2 = 0;
	}
	input_sync(input_dev);

	return IRQ_HANDLED;
	}

	static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
	{
	struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
	unsigned int val = 0;

	if (pdata->flags & EP93XX_KEYPAD_KDIV)
	clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
	else
	clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);

	if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
	val \|= KEY_INIT_DIS3KY;
	if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
	val \|= KEY_INIT_DIAG;
	if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
	val \|= KEY_INIT_BACK;
	if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
	val \|= KEY_INIT_T2;

	val \|= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);

	val \|= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);

	__raw_writel(val, keypad->mmio_base + KEY_INIT);
	}

	static int ep93xx_keypad_open(struct input_dev *pdev)
	{
	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

	if (!keypad->enabled) {
	ep93xx_keypad_config(keypad);
	clk_enable(keypad->clk);
	keypad->enabled = true;
	}

	return 0;
	}

	static void ep93xx_keypad_close(struct input_dev *pdev)
	{
	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

	if (keypad->enabled) {
	clk_disable(keypad->clk);
	keypad->enabled = false;
	}
	}


	#ifdef CONFIG_PM_SLEEP
	static int ep93xx_keypad_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	if (keypad->enabled) {
	clk_disable(keypad->clk);
	keypad->enabled = false;
	}

	mutex_unlock(&input_dev->mutex);

	if (device_may_wakeup(&pdev->dev))
	enable_irq_wake(keypad->irq);

	return 0;
	}

	static int ep93xx_keypad_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	if (device_may_wakeup(&pdev->dev))
	disable_irq_wake(keypad->irq);

	mutex_lock(&input_dev->mutex);

	if (input_dev->users) {
	if (!keypad->enabled) {
	ep93xx_keypad_config(keypad);
	clk_enable(keypad->clk);
	keypad->enabled = true;
	}
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
	ep93xx_keypad_suspend, ep93xx_keypad_resume);

	static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
	{
	struct ep93xx_keypad *keypad;
	const struct matrix_keymap_data *keymap_data;
	struct input_dev *input_dev;
	struct resource *res;
	int err;

	keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
	if (!keypad)
	return -ENOMEM;

	keypad->pdata = pdev->dev.platform_data;
	if (!keypad->pdata) {
	err = -EINVAL;
	goto failed_free;
	}

	keymap_data = keypad->pdata->keymap_data;
	if (!keymap_data) {
	err = -EINVAL;
	goto failed_free;
	}

	keypad->irq = platform_get_irq(pdev, 0);
	if (!keypad->irq) {
	err = -ENXIO;
	goto failed_free;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	err = -ENXIO;
	goto failed_free;
	}

	res = request_mem_region(res->start, resource_size(res), pdev->name);
	if (!res) {
	err = -EBUSY;
	goto failed_free;
	}

	keypad->mmio_base = ioremap(res->start, resource_size(res));
	if (keypad->mmio_base == NULL) {
	err = -ENXIO;
	goto failed_free_mem;
	}

	err = ep93xx_keypad_acquire_gpio(pdev);
	if (err)
	goto failed_free_io;

	keypad->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(keypad->clk)) {
	err = PTR_ERR(keypad->clk);
	goto failed_free_gpio;
	}

	input_dev = input_allocate_device();
	if (!input_dev) {
	err = -ENOMEM;
	goto failed_put_clk;
	}

	keypad->input_dev = input_dev;

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->open = ep93xx_keypad_open;
	input_dev->close = ep93xx_keypad_close;
	input_dev->dev.parent = &pdev->dev;

	err = matrix_keypad_build_keymap(keymap_data, NULL,
	EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
	keypad->keycodes, input_dev);
	if (err)
	goto failed_free_dev;

	if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
	__set_bit(EV_REP, input_dev->evbit);
	input_set_drvdata(input_dev, keypad);

	err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
	0, pdev->name, keypad);
	if (err)
	goto failed_free_dev;

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

	platform_set_drvdata(pdev, keypad);
	device_init_wakeup(&pdev->dev, 1);

	return 0;

	failed_free_irq:
	free_irq(keypad->irq, pdev);
	platform_set_drvdata(pdev, NULL);
	failed_free_dev:
	input_free_device(input_dev);
	failed_put_clk:
	clk_put(keypad->clk);
	failed_free_gpio:
	ep93xx_keypad_release_gpio(pdev);
	failed_free_io:
	iounmap(keypad->mmio_base);
	failed_free_mem:
	release_mem_region(res->start, resource_size(res));
	failed_free:
	kfree(keypad);
	return err;
	}

	static int __devexit ep93xx_keypad_remove(struct platform_device *pdev)
	{
	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
	struct resource *res;

	free_irq(keypad->irq, pdev);

	platform_set_drvdata(pdev, NULL);

	if (keypad->enabled)
	clk_disable(keypad->clk);
	clk_put(keypad->clk);

	input_unregister_device(keypad->input_dev);

	ep93xx_keypad_release_gpio(pdev);

	iounmap(keypad->mmio_base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	kfree(keypad);

	return 0;
	}

	static struct platform_driver ep93xx_keypad_driver = {
	.driver = {
	.name = "ep93xx-keypad",
	.owner = THIS_MODULE,
	.pm = &ep93xx_keypad_pm_ops,
	},
	.probe = ep93xx_keypad_probe,
	.remove = ep93xx_keypad_remove,
	};
	module_platform_driver(ep93xx_keypad_driver);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
	MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
	MODULE_ALIAS("platform:ep93xx-keypad");