[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/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");
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>
4a15235e WZ	14	#include <linux/interrupt.h>
	15	#include <linux/input.h>
	16	#include <linux/device.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/clk.h>
	19	#include <linux/err.h>
	20	#include <linux/io.h>
5a0e3ad6	21	#include <linux/slab.h>
4a15235e	22
54ecf4f0	23	#include <linux/platform_data/keypad-w90p910.h>
4a15235e WZ	24
	25	/* Keypad Interface Control Registers */
	26	#define KPI_CONF 0x00
	27	#define KPI_3KCONF 0x04
	28	#define KPI_LPCONF 0x08
	29	#define KPI_STATUS 0x0C
	30
	31	#define IS1KEY (0x01 << 16)
	32	#define INTTR (0x01 << 21)
	33	#define KEY0R (0x0f << 3)
	34	#define KEY0C 0x07
	35	#define DEBOUNCE_BIT 0x08
	36	#define KSIZE0 (0x01 << 16)
	37	#define KSIZE1 (0x01 << 17)
	38	#define KPSEL (0x01 << 19)
	39	#define ENKP (0x01 << 18)
	40
	41	#define KGET_RAW(n) (((n) & KEY0R) >> 3)
	42	#define KGET_COLUMN(n) ((n) & KEY0C)
	43
1932811f DT	44	#define W90P910_NUM_ROWS 8
1932811f DT	45	#define W90P910_NUM_COLS 8
09113aea	46	#define W90P910_ROW_SHIFT 3
4a15235e WZ	47
4a15235e WZ	48	struct w90p910_keypad {
09113aea	49	const struct w90p910_keypad_platform_data *pdata;
4a15235e WZ	50	struct clk *clk;
	51	struct input_dev *input_dev;
	52	void __iomem *mmio_base;
	53	int irq;
1932811f	54	unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
4a15235e WZ	55	};
4a15235e WZ	56
4a15235e WZ	57	static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
	58	unsigned int status)
	59	{
09113aea DT	60	struct input_dev *input_dev = keypad->input_dev;
	61	unsigned int row = KGET_RAW(status);
	62	unsigned int col = KGET_COLUMN(status);
	63	unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
	64	unsigned int key = keypad->keymap[code];
	65
	66	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	67	input_report_key(input_dev, key, 1);
	68	input_sync(input_dev);
	69
	70	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	71	input_report_key(input_dev, key, 0);
	72	input_sync(input_dev);
4a15235e WZ	73	}
	74
	75	static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
	76	{
	77	struct w90p910_keypad *keypad = dev_id;
	78	unsigned int kstatus, val;
	79
	80	kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
	81
	82	val = INTTR \| IS1KEY;
	83
	84	if (kstatus & val)
	85	w90p910_keypad_scan_matrix(keypad, kstatus);
	86
	87	return IRQ_HANDLED;
	88	}
	89
	90	static int w90p910_keypad_open(struct input_dev *dev)
	91	{
	92	struct w90p910_keypad *keypad = input_get_drvdata(dev);
09113aea	93	const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
4a15235e WZ	94	unsigned int val, config;
	95
	96	/* Enable unit clock */
	97	clk_enable(keypad->clk);
	98
	99	val = __raw_readl(keypad->mmio_base + KPI_CONF);
	100	val \|= (KPSEL \| ENKP);
	101	val &= ~(KSIZE0 \| KSIZE1);
	102
	103	config = pdata->prescale \| (pdata->debounce << DEBOUNCE_BIT);
	104
	105	val \|= config;
	106
	107	__raw_writel(val, keypad->mmio_base + KPI_CONF);
	108
	109	return 0;
	110	}
	111
	112	static void w90p910_keypad_close(struct input_dev *dev)
	113	{
	114	struct w90p910_keypad *keypad = input_get_drvdata(dev);
	115
	116	/* Disable clock unit */
	117	clk_disable(keypad->clk);
	118	}
	119
5298cc4c	120	static int w90p910_keypad_probe(struct platform_device *pdev)
4a15235e	121	{
09113aea	122	const struct w90p910_keypad_platform_data *pdata =
c838cb3d	123	dev_get_platdata(&pdev->dev);
903b9124	124	const struct matrix_keymap_data *keymap_data;
4a15235e WZ	125	struct w90p910_keypad *keypad;
	126	struct input_dev *input_dev;
	127	struct resource *res;
09113aea DT	128	int irq;
09113aea DT	129	int error;
4a15235e	130
09113aea	131	if (!pdata) {
4a15235e	132	dev_err(&pdev->dev, "no platform data defined\n");
09113aea	133	return -EINVAL;
4a15235e WZ	134	}
4a15235e WZ	135
903b9124 JL	136	keymap_data = pdata->keymap_data;
903b9124 JL	137
4a15235e WZ	138	irq = platform_get_irq(pdev, 0);
	139	if (irq < 0) {
	140	dev_err(&pdev->dev, "failed to get keypad irq\n");
09113aea DT	141	return -ENXIO;
	142	}
	143
	144	keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
	145	input_dev = input_allocate_device();
	146	if (!keypad \|\| !input_dev) {
	147	dev_err(&pdev->dev, "failed to allocate driver data\n");
	148	error = -ENOMEM;
4a15235e WZ	149	goto failed_free;
	150	}
	151
09113aea DT	152	keypad->pdata = pdata;
	153	keypad->input_dev = input_dev;
	154	keypad->irq = irq;
	155
4a15235e WZ	156	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	157	if (res == NULL) {
	158	dev_err(&pdev->dev, "failed to get I/O memory\n");
	159	error = -ENXIO;
	160	goto failed_free;
	161	}
	162
	163	res = request_mem_region(res->start, resource_size(res), pdev->name);
	164	if (res == NULL) {
	165	dev_err(&pdev->dev, "failed to request I/O memory\n");
	166	error = -EBUSY;
	167	goto failed_free;
	168	}
	169
	170	keypad->mmio_base = ioremap(res->start, resource_size(res));
	171	if (keypad->mmio_base == NULL) {
	172	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	173	error = -ENXIO;
09113aea	174	goto failed_free_res;
4a15235e WZ	175	}
	176
	177	keypad->clk = clk_get(&pdev->dev, NULL);
	178	if (IS_ERR(keypad->clk)) {
	179	dev_err(&pdev->dev, "failed to get keypad clock\n");
	180	error = PTR_ERR(keypad->clk);
	181	goto failed_free_io;
	182	}
	183
4a15235e WZ	184	/* set multi-function pin for w90p910 kpi. */
	185	mfp_set_groupi(&pdev->dev);
	186
	187	input_dev->name = pdev->name;
	188	input_dev->id.bustype = BUS_HOST;
	189	input_dev->open = w90p910_keypad_open;
	190	input_dev->close = w90p910_keypad_close;
	191	input_dev->dev.parent = &pdev->dev;
4a15235e	192
1932811f DT	193	error = matrix_keypad_build_keymap(keymap_data, NULL,
	194	W90P910_NUM_ROWS, W90P910_NUM_COLS,
	195	keypad->keymap, input_dev);
	196	if (error) {
	197	dev_err(&pdev->dev, "failed to build keymap\n");
	198	goto failed_put_clk;
	199	}
4a15235e	200
09113aea	201	error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
ec4665c4	202	0, pdev->name, keypad);
4a15235e WZ	203	if (error) {
4a15235e WZ	204	dev_err(&pdev->dev, "failed to request IRQ\n");
09113aea	205	goto failed_put_clk;
4a15235e WZ	206	}
4a15235e WZ	207
1932811f DT	208	__set_bit(EV_REP, input_dev->evbit);
	209	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	210	input_set_drvdata(input_dev, keypad);
	211
4a15235e WZ	212	/* Register the input device */
	213	error = input_register_device(input_dev);
	214	if (error) {
	215	dev_err(&pdev->dev, "failed to register input device\n");
	216	goto failed_free_irq;
	217	}
	218
09113aea	219	platform_set_drvdata(pdev, keypad);
4a15235e WZ	220	return 0;
	221
	222	failed_free_irq:
f0886a66	223	free_irq(irq, keypad);
4a15235e WZ	224	failed_put_clk:
	225	clk_put(keypad->clk);
	226	failed_free_io:
	227	iounmap(keypad->mmio_base);
09113aea	228	failed_free_res:
4a15235e WZ	229	release_mem_region(res->start, resource_size(res));
4a15235e WZ	230	failed_free:
09113aea	231	input_free_device(input_dev);
4a15235e WZ	232	kfree(keypad);
	233	return error;
	234	}
	235
e2619cf7	236	static int w90p910_keypad_remove(struct platform_device *pdev)
4a15235e WZ	237	{
	238	struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
	239	struct resource *res;
	240
f0886a66	241	free_irq(keypad->irq, keypad);
4a15235e WZ	242
	243	clk_put(keypad->clk);
	244
	245	input_unregister_device(keypad->input_dev);
	246
	247	iounmap(keypad->mmio_base);
4a15235e WZ	248	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	249	release_mem_region(res->start, resource_size(res));
	250
4a15235e	251	kfree(keypad);
09113aea	252
4a15235e WZ	253	return 0;
	254	}
	255
	256	static struct platform_driver w90p910_keypad_driver = {
	257	.probe = w90p910_keypad_probe,
1cb0aa88	258	.remove = w90p910_keypad_remove,
4a15235e	259	.driver = {
1afaab90	260	.name = "nuc900-kpi",
4a15235e WZ	261	},
4a15235e WZ	262	};
5146c84f	263	module_platform_driver(w90p910_keypad_driver);
4a15235e WZ	264
4a15235e WZ	265	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
fb962e1e	266	MODULE_DESCRIPTION("w90p910 keypad driver");
4a15235e	267	MODULE_LICENSE("GPL");
fb962e1e	268	MODULE_ALIAS("platform:nuc900-keypad");