drivers/input/keyboard/w90p910_keypad.c - linux - Git at Google

 /*
  * 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/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 <linux/slab.h>

 #include <linux/platform_data/keypad-w90p910.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 W90P910_NUM_ROWS	8
 #define W90P910_NUM_COLS	8
 #define W90P910_ROW_SHIFT	3

 struct w90p910_keypad {
 	const struct w90p910_keypad_platform_data *pdata;
 	struct clk *clk;
 	struct input_dev *input_dev;
 	void __iomem *mmio_base;
 	int irq;
 	unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
 };

 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
 							unsigned int status)
 {
 	struct input_dev *input_dev = keypad->input_dev;
 	unsigned int row = KGET_RAW(status);
 	unsigned int col = KGET_COLUMN(status);
 	unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
 	unsigned int key = keypad->keymap[code];

 	input_event(input_dev, EV_MSC, MSC_SCAN, code);
 	input_report_key(input_dev, key, 1);
 	input_sync(input_dev);

 	input_event(input_dev, EV_MSC, MSC_SCAN, code);
 	input_report_key(input_dev, key, 0);
 	input_sync(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);
 	const 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 w90p910_keypad_probe(struct platform_device *pdev)
 {
 	const struct w90p910_keypad_platform_data *pdata =
 						dev_get_platdata(&pdev->dev);
 	const struct matrix_keymap_data *keymap_data;
 	struct w90p910_keypad *keypad;
 	struct input_dev *input_dev;
 	struct resource *res;
 	int irq;
 	int error;

 	if (!pdata) {
 		dev_err(&pdev->dev, "no platform data defined\n");
 		return -EINVAL;
 	}

 	keymap_data = pdata->keymap_data;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "failed to get keypad irq\n");
 		return -ENXIO;
 	}

 	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!keypad || !input_dev) {
 		dev_err(&pdev->dev, "failed to allocate driver data\n");
 		error = -ENOMEM;
 		goto failed_free;
 	}

 	keypad->pdata = pdata;
 	keypad->input_dev = input_dev;
 	keypad->irq = irq;

 	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_res;
 	}

 	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;
 	}

 	/* 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;

 	error = matrix_keypad_build_keymap(keymap_data, NULL,
 					   W90P910_NUM_ROWS, W90P910_NUM_COLS,
 					   keypad->keymap, input_dev);
 	if (error) {
 		dev_err(&pdev->dev, "failed to build keymap\n");
 		goto failed_put_clk;
 	}

 	error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
 			    0, pdev->name, keypad);
 	if (error) {
 		dev_err(&pdev->dev, "failed to request IRQ\n");
 		goto failed_put_clk;
 	}

 	__set_bit(EV_REP, input_dev->evbit);
 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 	input_set_drvdata(input_dev, keypad);

 	/* 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;
 	}

 	platform_set_drvdata(pdev, keypad);
 	return 0;

 failed_free_irq:
 	free_irq(irq, keypad);
 failed_put_clk:
 	clk_put(keypad->clk);
 failed_free_io:
 	iounmap(keypad->mmio_base);
 failed_free_res:
 	release_mem_region(res->start, resource_size(res));
 failed_free:
 	input_free_device(input_dev);
 	kfree(keypad);
 	return error;
 }

 static int w90p910_keypad_remove(struct platform_device *pdev)
 {
 	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
 	struct resource *res;

 	free_irq(keypad->irq, keypad);

 	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));

 	kfree(keypad);

 	return 0;
 }

 static struct platform_driver w90p910_keypad_driver = {
 	.probe		= w90p910_keypad_probe,
 	.remove		= w90p910_keypad_remove,
 	.driver		= {
 		.name	= "nuc900-kpi",
 	},
 };
 module_platform_driver(w90p910_keypad_driver);

 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 MODULE_DESCRIPTION("w90p910 keypad driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:nuc900-keypad");
	/*
	* 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/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 <linux/slab.h>

	#include <linux/platform_data/keypad-w90p910.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 W90P910_NUM_ROWS 8
	#define W90P910_NUM_COLS 8
	#define W90P910_ROW_SHIFT 3

	struct w90p910_keypad {
	const struct w90p910_keypad_platform_data *pdata;
	struct clk *clk;
	struct input_dev *input_dev;
	void __iomem *mmio_base;
	int irq;
	unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
	};

	static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
	unsigned int status)
	{
	struct input_dev *input_dev = keypad->input_dev;
	unsigned int row = KGET_RAW(status);
	unsigned int col = KGET_COLUMN(status);
	unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
	unsigned int key = keypad->keymap[code];

	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	input_report_key(input_dev, key, 1);
	input_sync(input_dev);

	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	input_report_key(input_dev, key, 0);
	input_sync(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);
	const 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 w90p910_keypad_probe(struct platform_device *pdev)
	{
	const struct w90p910_keypad_platform_data *pdata =
	dev_get_platdata(&pdev->dev);
	const struct matrix_keymap_data *keymap_data;
	struct w90p910_keypad *keypad;
	struct input_dev *input_dev;
	struct resource *res;
	int irq;
	int error;

	if (!pdata) {
	dev_err(&pdev->dev, "no platform data defined\n");
	return -EINVAL;
	}

	keymap_data = pdata->keymap_data;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "failed to get keypad irq\n");
	return -ENXIO;
	}

	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!keypad \|\| !input_dev) {
	dev_err(&pdev->dev, "failed to allocate driver data\n");
	error = -ENOMEM;
	goto failed_free;
	}

	keypad->pdata = pdata;
	keypad->input_dev = input_dev;
	keypad->irq = irq;

	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_res;
	}

	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;
	}

	/* 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;

	error = matrix_keypad_build_keymap(keymap_data, NULL,
	W90P910_NUM_ROWS, W90P910_NUM_COLS,
	keypad->keymap, input_dev);
	if (error) {
	dev_err(&pdev->dev, "failed to build keymap\n");
	goto failed_put_clk;
	}

	error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
	0, pdev->name, keypad);
	if (error) {
	dev_err(&pdev->dev, "failed to request IRQ\n");
	goto failed_put_clk;
	}

	__set_bit(EV_REP, input_dev->evbit);
	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	input_set_drvdata(input_dev, keypad);

	/* 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;
	}

	platform_set_drvdata(pdev, keypad);
	return 0;

	failed_free_irq:
	free_irq(irq, keypad);
	failed_put_clk:
	clk_put(keypad->clk);
	failed_free_io:
	iounmap(keypad->mmio_base);
	failed_free_res:
	release_mem_region(res->start, resource_size(res));
	failed_free:
	input_free_device(input_dev);
	kfree(keypad);
	return error;
	}

	static int w90p910_keypad_remove(struct platform_device *pdev)
	{
	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
	struct resource *res;

	free_irq(keypad->irq, keypad);

	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));

	kfree(keypad);

	return 0;
	}

	static struct platform_driver w90p910_keypad_driver = {
	.probe = w90p910_keypad_probe,
	.remove = w90p910_keypad_remove,
	.driver = {
	.name = "nuc900-kpi",
	},
	};
	module_platform_driver(w90p910_keypad_driver);

	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
	MODULE_DESCRIPTION("w90p910 keypad driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:nuc900-keypad");