Commit 4a15235e authored by Wan ZongShun's avatar Wan ZongShun Committed by Dmitry Torokhov
Browse files

Input: add keypad driver for w90p910 



Add keypad driver for the 4x4 keypad on an evaluation board based
on w90p910.

Signed-off-by: default avatarWan ZongShun <mcuos.com@gmail.com>
Reviewed-by: default avatarTrilok Soni <soni.trilok@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent fa71c605

arch/arm/mach-w90x900/include/mach/w90p910_keypad.h

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#ifndef __ASM_ARCH_W90P910_KEYPAD_H

#define __ASM_ARCH_W90P910_KEYPAD_H



#include <linux/input/matrix_keypad.h>



extern void mfp_set_groupi(struct device *dev);



struct w90p910_keypad_platform_data {



	unsigned int	prescale;

	unsigned int	debounce;

	unsigned int	matrix_key_rows;

	unsigned int	matrix_key_cols;

	unsigned int	*matrix_key_map;

	int		matrix_key_map_size;

};



#endif /* __ASM_ARCH_W90P910_KEYPAD_H */

drivers/input/keyboard/Kconfig

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@@ -362,4 +362,14 @@ config KEYBOARD_XTKBD 
	  To compile this driver as a module, choose M here: the

	  module will be called xtkbd.



config KEYBOARD_W90P910

	tristate "W90P910 Matrix Keypad support"

	depends on ARCH_W90X900

	help

	  Say Y here to enable the matrix keypad on evaluation board

	  based on W90P910.



	  To compile this driver as a module, choose M here: the

	  module will be called w90p910_keypad.



endif

drivers/input/keyboard/Makefile

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@@ -31,3 +31,4 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o 
obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o

obj-$(CONFIG_KEYBOARD_TOSA)		+= tosakbd.o

obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o

obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o

drivers/input/keyboard/w90p910_keypad.c

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/*

 * Copyright (c) 2008-2009 Nuvoton technology corporation.

 *

 * Wan ZongShun <mcuos.com@gmail.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;version 2 of the License.

 *

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/input.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/io.h>



#include <mach/w90p910_keypad.h>



/* Keypad Interface Control Registers */

#define KPI_CONF		0x00

#define KPI_3KCONF		0x04

#define KPI_LPCONF		0x08

#define KPI_STATUS		0x0C



#define IS1KEY			(0x01 << 16)

#define INTTR			(0x01 << 21)

#define KEY0R			(0x0f << 3)

#define KEY0C			0x07

#define DEBOUNCE_BIT		0x08

#define KSIZE0			(0x01 << 16)

#define KSIZE1			(0x01 << 17)

#define KPSEL			(0x01 << 19)

#define ENKP			(0x01 << 18)



#define KGET_RAW(n)		(((n) & KEY0R) >> 3)

#define KGET_COLUMN(n)		((n) & KEY0C)



#define MAX_MATRIX_KEY_NUM	(8 * 8)



struct w90p910_keypad {

	struct w90p910_keypad_platform_data *pdata;

	struct clk *clk;

	struct input_dev *input_dev;

	void __iomem *mmio_base;

	int irq;

	unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];

};



static void w90p910_keypad_build_keycode(struct w90p910_keypad *keypad)

{

	struct w90p910_keypad_platform_data *pdata = keypad->pdata;

	struct input_dev *input_dev = keypad->input_dev;

	unsigned int *key;

	int i;



	key = &pdata->matrix_key_map[0];

	for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {

		int row = KEY_ROW(*key);

		int col = KEY_COL(*key);

		int code = KEY_VAL(*key);



		keypad->matrix_keycodes[(row << 3) + col] = code;

		__set_bit(code, input_dev->keybit);

	}

}



static inline unsigned int lookup_matrix_keycode(

		struct w90p910_keypad *keypad, int row, int col)

{

	return keypad->matrix_keycodes[(row << 3) + col];

}



static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,

							unsigned int status)

{

	unsigned int row, col, val;



	row = KGET_RAW(status);

	col = KGET_COLUMN(status);



	val = lookup_matrix_keycode(keypad, row, col);



	input_report_key(keypad->input_dev, val, 1);



	input_sync(keypad->input_dev);



	input_report_key(keypad->input_dev, val, 0);



	input_sync(keypad->input_dev);

}



static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)

{

	struct w90p910_keypad *keypad = dev_id;

	unsigned int  kstatus, val;



	kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);



	val = INTTR | IS1KEY;



	if (kstatus & val)

		w90p910_keypad_scan_matrix(keypad, kstatus);



	return IRQ_HANDLED;

}



static int w90p910_keypad_open(struct input_dev *dev)

{

	struct w90p910_keypad *keypad = input_get_drvdata(dev);

	struct w90p910_keypad_platform_data *pdata = keypad->pdata;

	unsigned int val, config;



	/* Enable unit clock */

	clk_enable(keypad->clk);



	val = __raw_readl(keypad->mmio_base + KPI_CONF);

	val |= (KPSEL | ENKP);

	val &= ~(KSIZE0 | KSIZE1);



	config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);



	val |= config;



	__raw_writel(val, keypad->mmio_base + KPI_CONF);



	return 0;

}



static void w90p910_keypad_close(struct input_dev *dev)

{

	struct w90p910_keypad *keypad = input_get_drvdata(dev);



	/* Disable clock unit */

	clk_disable(keypad->clk);

}



static int __devinit w90p910_keypad_probe(struct platform_device *pdev)

{

	struct w90p910_keypad *keypad;

	struct input_dev *input_dev;

	struct resource *res;

	int irq, error;



	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);

	if (keypad == NULL) {

		dev_err(&pdev->dev, "failed to allocate driver data\n");

		return -ENOMEM;

	}



	keypad->pdata = pdev->dev.platform_data;

	if (keypad->pdata == NULL) {

		dev_err(&pdev->dev, "no platform data defined\n");

		error = -EINVAL;

		goto failed_free;

	}



	irq = platform_get_irq(pdev, 0);

	if (irq < 0) {

		dev_err(&pdev->dev, "failed to get keypad irq\n");

		error = -ENXIO;

		goto failed_free;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (res == NULL) {

		dev_err(&pdev->dev, "failed to get I/O memory\n");

		error = -ENXIO;

		goto failed_free;

	}



	res = request_mem_region(res->start, resource_size(res), pdev->name);

	if (res == NULL) {

		dev_err(&pdev->dev, "failed to request I/O memory\n");

		error = -EBUSY;

		goto failed_free;

	}



	keypad->mmio_base = ioremap(res->start, resource_size(res));

	if (keypad->mmio_base == NULL) {

		dev_err(&pdev->dev, "failed to remap I/O memory\n");

		error = -ENXIO;

		goto failed_free_mem;

	}



	keypad->clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(keypad->clk)) {

		dev_err(&pdev->dev, "failed to get keypad clock\n");

		error = PTR_ERR(keypad->clk);

		goto failed_free_io;

	}



	/* Create and register the input driver. */

	input_dev = input_allocate_device();

	if (!input_dev) {

		dev_err(&pdev->dev, "failed to allocate input device\n");

		error = -ENOMEM;

		goto failed_put_clk;

	}



	/* set multi-function pin for w90p910 kpi. */

	mfp_set_groupi(&pdev->dev);



	input_dev->name = pdev->name;

	input_dev->id.bustype = BUS_HOST;

	input_dev->open = w90p910_keypad_open;

	input_dev->close = w90p910_keypad_close;

	input_dev->dev.parent = &pdev->dev;

	input_dev->keycode = keypad->matrix_keycodes;

	input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]);

	input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes);



	keypad->input_dev = input_dev;

	input_set_drvdata(input_dev, keypad);



	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);

	w90p910_keypad_build_keycode(keypad);

	platform_set_drvdata(pdev, keypad);



	error = request_irq(irq, w90p910_keypad_irq_handler, IRQF_DISABLED,

			    pdev->name, keypad);

	if (error) {

		dev_err(&pdev->dev, "failed to request IRQ\n");

		goto failed_free_dev;

	}



	keypad->irq = irq;



	/* Register the input device */

	error = input_register_device(input_dev);

	if (error) {

		dev_err(&pdev->dev, "failed to register input device\n");

		goto failed_free_irq;

	}



	return 0;



failed_free_irq:

	free_irq(irq, pdev);

	platform_set_drvdata(pdev, NULL);

failed_free_dev:

	input_free_device(input_dev);

failed_put_clk:

	clk_put(keypad->clk);

failed_free_io:

	iounmap(keypad->mmio_base);

failed_free_mem:

	release_mem_region(res->start, resource_size(res));

failed_free:

	kfree(keypad);

	return error;

}



static int __devexit w90p910_keypad_remove(struct platform_device *pdev)

{

	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);

	struct resource *res;



	free_irq(keypad->irq, pdev);



	clk_put(keypad->clk);



	input_unregister_device(keypad->input_dev);



	iounmap(keypad->mmio_base);



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	release_mem_region(res->start, resource_size(res));



	platform_set_drvdata(pdev, NULL);

	kfree(keypad);

	return 0;

}



static struct platform_driver w90p910_keypad_driver = {

	.probe		= w90p910_keypad_probe,

	.remove		= __devexit_p(w90p910_keypad_remove),

	.driver		= {

		.name	= "w90p910-keypad",

		.owner	= THIS_MODULE,

	},

};



static int __init w90p910_keypad_init(void)

{

	return platform_driver_register(&w90p910_keypad_driver);

}



static void __exit w90p910_keypad_exit(void)

{

	platform_driver_unregister(&w90p910_keypad_driver);

}



module_init(w90p910_keypad_init);

module_exit(w90p910_keypad_exit);



MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");

MODULE_DESCRIPTION("w90p910 keypad driver!");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:w90p910-keypad");

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