[deliverable/linux.git] / drivers / input / keyboard / w90p910_keypad.c

/*
 * 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 <linux/slab.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 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 __devinit w90p910_keypad_probe(struct platform_device *pdev)
{
	const struct w90p910_keypad_platform_data *pdata =
						pdev->dev.platform_data;
	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, pdev);
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 __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	= "nuc900-kpi",
		.owner	= THIS_MODULE,
	},
};
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");
Commit	Line	Data
4a15235e WZ	1	/*
	2	* Copyright (c) 2008-2009 Nuvoton technology corporation.
	3	*
	4	* Wan ZongShun <mcuos.com@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation;version 2 of the License.
	9	*
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/input.h>
	17	#include <linux/device.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/clk.h>
	20	#include <linux/err.h>
	21	#include <linux/io.h>
5a0e3ad6	22	#include <linux/slab.h>
4a15235e WZ	23
	24	#include <mach/w90p910_keypad.h>
	25
	26	/* Keypad Interface Control Registers */
	27	#define KPI_CONF 0x00
	28	#define KPI_3KCONF 0x04
	29	#define KPI_LPCONF 0x08
	30	#define KPI_STATUS 0x0C
	31
	32	#define IS1KEY (0x01 << 16)
	33	#define INTTR (0x01 << 21)
	34	#define KEY0R (0x0f << 3)
	35	#define KEY0C 0x07
	36	#define DEBOUNCE_BIT 0x08
	37	#define KSIZE0 (0x01 << 16)
	38	#define KSIZE1 (0x01 << 17)
	39	#define KPSEL (0x01 << 19)
	40	#define ENKP (0x01 << 18)
	41
	42	#define KGET_RAW(n) (((n) & KEY0R) >> 3)
	43	#define KGET_COLUMN(n) ((n) & KEY0C)
	44
1932811f DT	45	#define W90P910_NUM_ROWS 8
1932811f DT	46	#define W90P910_NUM_COLS 8
09113aea	47	#define W90P910_ROW_SHIFT 3
4a15235e WZ	48
4a15235e WZ	49	struct w90p910_keypad {
09113aea	50	const struct w90p910_keypad_platform_data *pdata;
4a15235e WZ	51	struct clk *clk;
	52	struct input_dev *input_dev;
	53	void __iomem *mmio_base;
	54	int irq;
1932811f	55	unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
4a15235e WZ	56	};
4a15235e WZ	57
4a15235e WZ	58	static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
	59	unsigned int status)
	60	{
09113aea DT	61	struct input_dev *input_dev = keypad->input_dev;
	62	unsigned int row = KGET_RAW(status);
	63	unsigned int col = KGET_COLUMN(status);
	64	unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
	65	unsigned int key = keypad->keymap[code];
	66
	67	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	68	input_report_key(input_dev, key, 1);
	69	input_sync(input_dev);
	70
	71	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	72	input_report_key(input_dev, key, 0);
	73	input_sync(input_dev);
4a15235e WZ	74	}
	75
	76	static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
	77	{
	78	struct w90p910_keypad *keypad = dev_id;
	79	unsigned int kstatus, val;
	80
	81	kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
	82
	83	val = INTTR \| IS1KEY;
	84
	85	if (kstatus & val)
	86	w90p910_keypad_scan_matrix(keypad, kstatus);
	87
	88	return IRQ_HANDLED;
	89	}
	90
	91	static int w90p910_keypad_open(struct input_dev *dev)
	92	{
	93	struct w90p910_keypad *keypad = input_get_drvdata(dev);
09113aea	94	const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
4a15235e WZ	95	unsigned int val, config;
	96
	97	/* Enable unit clock */
	98	clk_enable(keypad->clk);
	99
	100	val = __raw_readl(keypad->mmio_base + KPI_CONF);
	101	val \|= (KPSEL \| ENKP);
	102	val &= ~(KSIZE0 \| KSIZE1);
	103
	104	config = pdata->prescale \| (pdata->debounce << DEBOUNCE_BIT);
	105
	106	val \|= config;
	107
	108	__raw_writel(val, keypad->mmio_base + KPI_CONF);
	109
	110	return 0;
	111	}
	112
	113	static void w90p910_keypad_close(struct input_dev *dev)
	114	{
	115	struct w90p910_keypad *keypad = input_get_drvdata(dev);
	116
	117	/* Disable clock unit */
	118	clk_disable(keypad->clk);
	119	}
	120
	121	static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
	122	{
09113aea DT	123	const struct w90p910_keypad_platform_data *pdata =
09113aea DT	124	pdev->dev.platform_data;
903b9124	125	const struct matrix_keymap_data *keymap_data;
4a15235e WZ	126	struct w90p910_keypad *keypad;
	127	struct input_dev *input_dev;
	128	struct resource *res;
09113aea DT	129	int irq;
09113aea DT	130	int error;
4a15235e	131
09113aea	132	if (!pdata) {
4a15235e	133	dev_err(&pdev->dev, "no platform data defined\n");
09113aea	134	return -EINVAL;
4a15235e WZ	135	}
4a15235e WZ	136
903b9124 JL	137	keymap_data = pdata->keymap_data;
903b9124 JL	138
4a15235e WZ	139	irq = platform_get_irq(pdev, 0);
	140	if (irq < 0) {
	141	dev_err(&pdev->dev, "failed to get keypad irq\n");
09113aea DT	142	return -ENXIO;
	143	}
	144
	145	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
	146	input_dev = input_allocate_device();
	147	if (!keypad \|\| !input_dev) {
	148	dev_err(&pdev->dev, "failed to allocate driver data\n");
	149	error = -ENOMEM;
4a15235e WZ	150	goto failed_free;
	151	}
	152
09113aea DT	153	keypad->pdata = pdata;
	154	keypad->input_dev = input_dev;
	155	keypad->irq = irq;
	156
4a15235e WZ	157	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	158	if (res == NULL) {
	159	dev_err(&pdev->dev, "failed to get I/O memory\n");
	160	error = -ENXIO;
	161	goto failed_free;
	162	}
	163
	164	res = request_mem_region(res->start, resource_size(res), pdev->name);
	165	if (res == NULL) {
	166	dev_err(&pdev->dev, "failed to request I/O memory\n");
	167	error = -EBUSY;
	168	goto failed_free;
	169	}
	170
	171	keypad->mmio_base = ioremap(res->start, resource_size(res));
	172	if (keypad->mmio_base == NULL) {
	173	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	174	error = -ENXIO;
09113aea	175	goto failed_free_res;
4a15235e WZ	176	}
	177
	178	keypad->clk = clk_get(&pdev->dev, NULL);
	179	if (IS_ERR(keypad->clk)) {
	180	dev_err(&pdev->dev, "failed to get keypad clock\n");
	181	error = PTR_ERR(keypad->clk);
	182	goto failed_free_io;
	183	}
	184
4a15235e WZ	185	/* set multi-function pin for w90p910 kpi. */
	186	mfp_set_groupi(&pdev->dev);
	187
	188	input_dev->name = pdev->name;
	189	input_dev->id.bustype = BUS_HOST;
	190	input_dev->open = w90p910_keypad_open;
	191	input_dev->close = w90p910_keypad_close;
	192	input_dev->dev.parent = &pdev->dev;
4a15235e	193
1932811f DT	194	error = matrix_keypad_build_keymap(keymap_data, NULL,
	195	W90P910_NUM_ROWS, W90P910_NUM_COLS,
	196	keypad->keymap, input_dev);
	197	if (error) {
	198	dev_err(&pdev->dev, "failed to build keymap\n");
	199	goto failed_put_clk;
	200	}
4a15235e	201
09113aea	202	error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
ec4665c4	203	0, pdev->name, keypad);
4a15235e WZ	204	if (error) {
4a15235e WZ	205	dev_err(&pdev->dev, "failed to request IRQ\n");
09113aea	206	goto failed_put_clk;
4a15235e WZ	207	}
4a15235e WZ	208
1932811f DT	209	__set_bit(EV_REP, input_dev->evbit);
	210	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	211	input_set_drvdata(input_dev, keypad);
	212
4a15235e WZ	213	/* Register the input device */
	214	error = input_register_device(input_dev);
	215	if (error) {
	216	dev_err(&pdev->dev, "failed to register input device\n");
	217	goto failed_free_irq;
	218	}
	219
09113aea	220	platform_set_drvdata(pdev, keypad);
4a15235e WZ	221	return 0;
	222
	223	failed_free_irq:
	224	free_irq(irq, pdev);
4a15235e WZ	225	failed_put_clk:
	226	clk_put(keypad->clk);
	227	failed_free_io:
	228	iounmap(keypad->mmio_base);
09113aea	229	failed_free_res:
4a15235e WZ	230	release_mem_region(res->start, resource_size(res));
4a15235e WZ	231	failed_free:
09113aea	232	input_free_device(input_dev);
4a15235e WZ	233	kfree(keypad);
	234	return error;
	235	}
	236
	237	static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
	238	{
	239	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
	240	struct resource *res;
	241
	242	free_irq(keypad->irq, pdev);
	243
	244	clk_put(keypad->clk);
	245
	246	input_unregister_device(keypad->input_dev);
	247
	248	iounmap(keypad->mmio_base);
4a15235e WZ	249	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	250	release_mem_region(res->start, resource_size(res));
	251
	252	platform_set_drvdata(pdev, NULL);
	253	kfree(keypad);
09113aea	254
4a15235e WZ	255	return 0;
	256	}
	257
	258	static struct platform_driver w90p910_keypad_driver = {
	259	.probe = w90p910_keypad_probe,
	260	.remove = __devexit_p(w90p910_keypad_remove),
	261	.driver = {
1afaab90	262	.name = "nuc900-kpi",
4a15235e WZ	263	.owner = THIS_MODULE,
	264	},
	265	};
5146c84f	266	module_platform_driver(w90p910_keypad_driver);
4a15235e WZ	267
4a15235e WZ	268	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
fb962e1e	269	MODULE_DESCRIPTION("w90p910 keypad driver");
4a15235e	270	MODULE_LICENSE("GPL");
fb962e1e	271	MODULE_ALIAS("platform:nuc900-keypad");