drivers/input/keyboard/bf54x-keys.c - kernel/msm-4.19 - Gitiles

 /*
  * File:         drivers/input/keyboard/bf54x-keys.c
  * Based on:
  * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
  *
  * Created:
  * Description:  keypad driver for Analog Devices Blackfin BF54x Processors
  *
  *
  * Modified:
  *               Copyright 2007-2008 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/module.h>

 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/sched.h>
 #include <linux/pm.h>
 #include <linux/sysctl.h>
 #include <linux/proc_fs.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>

 #include <asm/portmux.h>
 #include <mach/bf54x_keys.h>

 #define DRV_NAME	"bf54x-keys"
 #define TIME_SCALE	100	/* 100 ns */
 #define	MAX_MULT	(0xFF * TIME_SCALE)
 #define MAX_RC		8	/* Max Row/Col */

 static const u16 per_rows[] = {
 	P_KEY_ROW7,
 	P_KEY_ROW6,
 	P_KEY_ROW5,
 	P_KEY_ROW4,
 	P_KEY_ROW3,
 	P_KEY_ROW2,
 	P_KEY_ROW1,
 	P_KEY_ROW0,
 	0
 };

 static const u16 per_cols[] = {
 	P_KEY_COL7,
 	P_KEY_COL6,
 	P_KEY_COL5,
 	P_KEY_COL4,
 	P_KEY_COL3,
 	P_KEY_COL2,
 	P_KEY_COL1,
 	P_KEY_COL0,
 	0
 };

 struct bf54x_kpad {
 	struct input_dev *input;
 	int irq;
 	unsigned short lastkey;
 	unsigned short *keycode;
 	struct timer_list timer;
 	unsigned int keyup_test_jiffies;
 	unsigned short kpad_msel;
 	unsigned short kpad_prescale;
 	unsigned short kpad_ctl;
 };

 static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
 			struct input_dev *input, u16 keyident)
 {
 	u16 i;

 	for (i = 0; i < input->keycodemax; i++)
 		if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
 			return bf54x_kpad->keycode[i];
 	return -1;
 }

 static inline void bfin_keycodecpy(unsigned short *keycode,
 			const unsigned int *pdata_kc,
 			unsigned short keymapsize)
 {
 	unsigned int i;

 	for (i = 0; i < keymapsize; i++) {
 		keycode[i] = pdata_kc[i] & 0xffff;
 		keycode[i + keymapsize] = pdata_kc[i] >> 16;
 	}
 }

 static inline u16 bfin_kpad_get_prescale(u32 timescale)
 {
 	u32 sclk = get_sclk();

 	return ((((sclk / 1000) * timescale) / 1024) - 1);
 }

 static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
 {
 	return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
 }

 static inline void bfin_kpad_clear_irq(void)
 {
 	bfin_write_KPAD_STAT(0xFFFF);
 	bfin_write_KPAD_ROWCOL(0xFFFF);
 }

 static void bfin_kpad_timer(unsigned long data)
 {
 	struct platform_device *pdev =  (struct platform_device *) data;
 	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

 	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 		/* Try again later */
 		mod_timer(&bf54x_kpad->timer,
 			  jiffies + bf54x_kpad->keyup_test_jiffies);
 		return;
 	}

 	input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
 	input_sync(bf54x_kpad->input);

 	/* Clear IRQ Status */

 	bfin_kpad_clear_irq();
 	enable_irq(bf54x_kpad->irq);
 }

 static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
 {
 	struct platform_device *pdev = dev_id;
 	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 	struct input_dev *input = bf54x_kpad->input;
 	int key;
 	u16 rowcol = bfin_read_KPAD_ROWCOL();

 	key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);

 	input_report_key(input, key, 1);
 	input_sync(input);

 	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 		disable_irq(bf54x_kpad->irq);
 		bf54x_kpad->lastkey = key;
 		mod_timer(&bf54x_kpad->timer,
 			  jiffies + bf54x_kpad->keyup_test_jiffies);
 	} else {
 		input_report_key(input, key, 0);
 		input_sync(input);

 		bfin_kpad_clear_irq();
 	}

 	return IRQ_HANDLED;
 }

 static int __devinit bfin_kpad_probe(struct platform_device *pdev)
 {
 	struct bf54x_kpad *bf54x_kpad;
 	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 	struct input_dev *input;
 	int i, error;

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

 	if (!pdata->keymapsize ||
 	    pdata->keymapsize > (pdata->rows * pdata->cols)) {
 		printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
 		return -EINVAL;
 	}

 	bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
 	if (!bf54x_kpad)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, bf54x_kpad);

 	/* Allocate memory for keymap followed by private LUT */
 	bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
 					sizeof(unsigned short) * 2, GFP_KERNEL);
 	if (!bf54x_kpad->keycode) {
 		error = -ENOMEM;
 		goto out;
 	}

 	if (!pdata->debounce_time || pdata->debounce_time > MAX_MULT ||
 	    !pdata->coldrive_time || pdata->coldrive_time > MAX_MULT) {
 		printk(KERN_ERR DRV_NAME
 			": Invalid Debounce/Columdrive Time from pdata\n");
 		bfin_write_KPAD_MSEL(0xFF0);	/* Default MSEL	*/
 	} else {
 		bfin_write_KPAD_MSEL(
 			((pdata->debounce_time / TIME_SCALE)
 						& DBON_SCALE) |
 			(((pdata->coldrive_time / TIME_SCALE) << 8)
 						& COLDRV_SCALE));

 	}

 	if (!pdata->keyup_test_interval)
 		bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
 	else
 		bf54x_kpad->keyup_test_jiffies =
 			msecs_to_jiffies(pdata->keyup_test_interval);

 	if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
 				    DRV_NAME)) {
 		printk(KERN_ERR DRV_NAME
 			": Requesting Peripherals failed\n");
 		error = -EFAULT;
 		goto out0;
 	}

 	if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
 				    DRV_NAME)) {
 		printk(KERN_ERR DRV_NAME
 			": Requesting Peripherals failed\n");
 		error = -EFAULT;
 		goto out1;
 	}

 	bf54x_kpad->irq = platform_get_irq(pdev, 0);
 	if (bf54x_kpad->irq < 0) {
 		error = -ENODEV;
 		goto out2;
 	}

 	error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
 				 IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
 	if (error) {
 		printk(KERN_ERR DRV_NAME
 			": unable to claim irq %d; error %d\n",
 			bf54x_kpad->irq, error);
 		goto out2;
 	}

 	input = input_allocate_device();
 	if (!input) {
 		error = -ENOMEM;
 		goto out3;
 	}

 	bf54x_kpad->input = input;

 	input->name = pdev->name;
 	input->phys = "bf54x-keys/input0";
 	input->dev.parent = &pdev->dev;

 	input_set_drvdata(input, bf54x_kpad);

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

 	input->keycodesize = sizeof(unsigned short);
 	input->keycodemax = pdata->keymapsize;
 	input->keycode = bf54x_kpad->keycode;

 	bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);

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

 	if (pdata->repeat)
 		__set_bit(EV_REP, input->evbit);

 	for (i = 0; i < input->keycodemax; i++)
 		__set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
 	__clear_bit(KEY_RESERVED, input->keybit);

 	error = input_register_device(input);
 	if (error) {
 		printk(KERN_ERR DRV_NAME
 			": Unable to register input device (%d)\n", error);
 		goto out4;
 	}

 	/* Init Keypad Key Up/Release test timer */

 	setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);

 	bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));

 	bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
 				(((pdata->rows - 1) << 10) & KPAD_ROWEN) |
 				(2 & KPAD_IRQMODE));

 	bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);

 	device_init_wakeup(&pdev->dev, 1);

 	printk(KERN_ERR DRV_NAME
 		": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);

 	return 0;

 out4:
 	input_free_device(input);
 out3:
 	free_irq(bf54x_kpad->irq, pdev);
 out2:
 	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 out1:
 	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 out0:
 	kfree(bf54x_kpad->keycode);
 out:
 	kfree(bf54x_kpad);
 	platform_set_drvdata(pdev, NULL);

 	return error;
 }

 static int __devexit bfin_kpad_remove(struct platform_device *pdev)
 {
 	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

 	del_timer_sync(&bf54x_kpad->timer);
 	free_irq(bf54x_kpad->irq, pdev);

 	input_unregister_device(bf54x_kpad->input);

 	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);

 	kfree(bf54x_kpad->keycode);
 	kfree(bf54x_kpad);
 	platform_set_drvdata(pdev, NULL);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

 	bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL();
 	bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE();
 	bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL();

 	if (device_may_wakeup(&pdev->dev))
 		enable_irq_wake(bf54x_kpad->irq);

 	return 0;
 }

 static int bfin_kpad_resume(struct platform_device *pdev)
 {
 	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

 	bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel);
 	bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale);
 	bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl);

 	if (device_may_wakeup(&pdev->dev))
 		disable_irq_wake(bf54x_kpad->irq);

 	return 0;
 }
 #else
 # define bfin_kpad_suspend NULL
 # define bfin_kpad_resume  NULL
 #endif

 struct platform_driver bfin_kpad_device_driver = {
 	.driver		= {
 		.name	= DRV_NAME,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= bfin_kpad_probe,
 	.remove		= __devexit_p(bfin_kpad_remove),
 	.suspend	= bfin_kpad_suspend,
 	.resume		= bfin_kpad_resume,
 };

 static int __init bfin_kpad_init(void)
 {
 	return platform_driver_register(&bfin_kpad_device_driver);
 }

 static void __exit bfin_kpad_exit(void)
 {
 	platform_driver_unregister(&bfin_kpad_device_driver);
 }

 module_init(bfin_kpad_init);
 module_exit(bfin_kpad_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
 MODULE_ALIAS("platform:bf54x-keys");
	/*
	* File: drivers/input/keyboard/bf54x-keys.c
	* Based on:
	* Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
	*
	* Created:
	* Description: keypad driver for Analog Devices Blackfin BF54x Processors
	*
	*
	* Modified:
	* Copyright 2007-2008 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/module.h>

	#include <linux/init.h>
	#include <linux/fs.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/sched.h>
	#include <linux/pm.h>
	#include <linux/sysctl.h>
	#include <linux/proc_fs.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/input.h>

	#include <asm/portmux.h>
	#include <mach/bf54x_keys.h>

	#define DRV_NAME "bf54x-keys"
	#define TIME_SCALE 100 /* 100 ns */
	#define MAX_MULT (0xFF * TIME_SCALE)
	#define MAX_RC 8 /* Max Row/Col */

	static const u16 per_rows[] = {
	P_KEY_ROW7,
	P_KEY_ROW6,
	P_KEY_ROW5,
	P_KEY_ROW4,
	P_KEY_ROW3,
	P_KEY_ROW2,
	P_KEY_ROW1,
	P_KEY_ROW0,
	0
	};

	static const u16 per_cols[] = {
	P_KEY_COL7,
	P_KEY_COL6,
	P_KEY_COL5,
	P_KEY_COL4,
	P_KEY_COL3,
	P_KEY_COL2,
	P_KEY_COL1,
	P_KEY_COL0,
	0
	};

	struct bf54x_kpad {
	struct input_dev *input;
	int irq;
	unsigned short lastkey;
	unsigned short *keycode;
	struct timer_list timer;
	unsigned int keyup_test_jiffies;
	unsigned short kpad_msel;
	unsigned short kpad_prescale;
	unsigned short kpad_ctl;
	};

	static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
	struct input_dev *input, u16 keyident)
	{
	u16 i;

	for (i = 0; i < input->keycodemax; i++)
	if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
	return bf54x_kpad->keycode[i];
	return -1;
	}

	static inline void bfin_keycodecpy(unsigned short *keycode,
	const unsigned int *pdata_kc,
	unsigned short keymapsize)
	{
	unsigned int i;

	for (i = 0; i < keymapsize; i++) {
	keycode[i] = pdata_kc[i] & 0xffff;
	keycode[i + keymapsize] = pdata_kc[i] >> 16;
	}
	}

	static inline u16 bfin_kpad_get_prescale(u32 timescale)
	{
	u32 sclk = get_sclk();

	return ((((sclk / 1000) * timescale) / 1024) - 1);
	}

	static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
	{
	return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
	}

	static inline void bfin_kpad_clear_irq(void)
	{
	bfin_write_KPAD_STAT(0xFFFF);
	bfin_write_KPAD_ROWCOL(0xFFFF);
	}

	static void bfin_kpad_timer(unsigned long data)
	{
	struct platform_device pdev = (struct platform_device ) data;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
	/* Try again later */
	mod_timer(&bf54x_kpad->timer,
	jiffies + bf54x_kpad->keyup_test_jiffies);
	return;
	}

	input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
	input_sync(bf54x_kpad->input);

	/* Clear IRQ Status */

	bfin_kpad_clear_irq();
	enable_irq(bf54x_kpad->irq);
	}

	static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
	{
	struct platform_device *pdev = dev_id;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
	struct input_dev *input = bf54x_kpad->input;
	int key;
	u16 rowcol = bfin_read_KPAD_ROWCOL();

	key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);

	input_report_key(input, key, 1);
	input_sync(input);

	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
	disable_irq(bf54x_kpad->irq);
	bf54x_kpad->lastkey = key;
	mod_timer(&bf54x_kpad->timer,
	jiffies + bf54x_kpad->keyup_test_jiffies);
	} else {
	input_report_key(input, key, 0);
	input_sync(input);

	bfin_kpad_clear_irq();
	}

	return IRQ_HANDLED;
	}

	static int __devinit bfin_kpad_probe(struct platform_device *pdev)
	{
	struct bf54x_kpad *bf54x_kpad;
	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
	struct input_dev *input;
	int i, error;

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

	if (!pdata->keymapsize \|\|
	pdata->keymapsize > (pdata->rows * pdata->cols)) {
	printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
	return -EINVAL;
	}

	bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
	if (!bf54x_kpad)
	return -ENOMEM;

	platform_set_drvdata(pdev, bf54x_kpad);

	/* Allocate memory for keymap followed by private LUT */
	bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
	sizeof(unsigned short) * 2, GFP_KERNEL);
	if (!bf54x_kpad->keycode) {
	error = -ENOMEM;
	goto out;
	}

	if (!pdata->debounce_time \|\| pdata->debounce_time > MAX_MULT \|\|
	!pdata->coldrive_time \|\| pdata->coldrive_time > MAX_MULT) {
	printk(KERN_ERR DRV_NAME
	": Invalid Debounce/Columdrive Time from pdata\n");
	bfin_write_KPAD_MSEL(0xFF0); /* Default MSEL */
	} else {
	bfin_write_KPAD_MSEL(
	((pdata->debounce_time / TIME_SCALE)
	& DBON_SCALE) \|
	(((pdata->coldrive_time / TIME_SCALE) << 8)
	& COLDRV_SCALE));

	}

	if (!pdata->keyup_test_interval)
	bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
	else
	bf54x_kpad->keyup_test_jiffies =
	msecs_to_jiffies(pdata->keyup_test_interval);

	if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
	DRV_NAME)) {
	printk(KERN_ERR DRV_NAME
	": Requesting Peripherals failed\n");
	error = -EFAULT;
	goto out0;
	}

	if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
	DRV_NAME)) {
	printk(KERN_ERR DRV_NAME
	": Requesting Peripherals failed\n");
	error = -EFAULT;
	goto out1;
	}

	bf54x_kpad->irq = platform_get_irq(pdev, 0);
	if (bf54x_kpad->irq < 0) {
	error = -ENODEV;
	goto out2;
	}

	error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
	IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
	if (error) {
	printk(KERN_ERR DRV_NAME
	": unable to claim irq %d; error %d\n",
	bf54x_kpad->irq, error);
	goto out2;
	}

	input = input_allocate_device();
	if (!input) {
	error = -ENOMEM;
	goto out3;
	}

	bf54x_kpad->input = input;

	input->name = pdev->name;
	input->phys = "bf54x-keys/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, bf54x_kpad);

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

	input->keycodesize = sizeof(unsigned short);
	input->keycodemax = pdata->keymapsize;
	input->keycode = bf54x_kpad->keycode;

	bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);

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

	if (pdata->repeat)
	__set_bit(EV_REP, input->evbit);

	for (i = 0; i < input->keycodemax; i++)
	__set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	error = input_register_device(input);
	if (error) {
	printk(KERN_ERR DRV_NAME
	": Unable to register input device (%d)\n", error);
	goto out4;
	}

	/* Init Keypad Key Up/Release test timer */

	setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);

	bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));

	bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) \|
	(((pdata->rows - 1) << 10) & KPAD_ROWEN) \|
	(2 & KPAD_IRQMODE));

	bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() \| KPAD_EN);

	device_init_wakeup(&pdev->dev, 1);

	printk(KERN_ERR DRV_NAME
	": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);

	return 0;

	out4:
	input_free_device(input);
	out3:
	free_irq(bf54x_kpad->irq, pdev);
	out2:
	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
	out1:
	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
	out0:
	kfree(bf54x_kpad->keycode);
	out:
	kfree(bf54x_kpad);
	platform_set_drvdata(pdev, NULL);

	return error;
	}

	static int __devexit bfin_kpad_remove(struct platform_device *pdev)
	{
	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	del_timer_sync(&bf54x_kpad->timer);
	free_irq(bf54x_kpad->irq, pdev);

	input_unregister_device(bf54x_kpad->input);

	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);

	kfree(bf54x_kpad->keycode);
	kfree(bf54x_kpad);
	platform_set_drvdata(pdev, NULL);

	return 0;
	}

	#ifdef CONFIG_PM
	static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
	{
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL();
	bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE();
	bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL();

	if (device_may_wakeup(&pdev->dev))
	enable_irq_wake(bf54x_kpad->irq);

	return 0;
	}

	static int bfin_kpad_resume(struct platform_device *pdev)
	{
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel);
	bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale);
	bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl);

	if (device_may_wakeup(&pdev->dev))
	disable_irq_wake(bf54x_kpad->irq);

	return 0;
	}
	#else
	# define bfin_kpad_suspend NULL
	# define bfin_kpad_resume NULL
	#endif

	struct platform_driver bfin_kpad_device_driver = {
	.driver = {
	.name = DRV_NAME,
	.owner = THIS_MODULE,
	},
	.probe = bfin_kpad_probe,
	.remove = __devexit_p(bfin_kpad_remove),
	.suspend = bfin_kpad_suspend,
	.resume = bfin_kpad_resume,
	};

	static int __init bfin_kpad_init(void)
	{
	return platform_driver_register(&bfin_kpad_device_driver);
	}

	static void __exit bfin_kpad_exit(void)
	{
	platform_driver_unregister(&bfin_kpad_device_driver);
	}

	module_init(bfin_kpad_init);
	module_exit(bfin_kpad_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
	MODULE_ALIAS("platform:bf54x-keys");