Input: add keypad driver for w90p910 (4a15235e) · Commits · e / devices / android_kernel_samsung_universal8890

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");