[linux-2.6-block.git] / drivers / input / keyboard / lpc32xx-keys.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * NXP LPC32xx SoC Key Scan Interface
 *
 * Authors:
 *    Kevin Wells <kevin.wells@nxp.com>
 *    Roland Stigge <stigge@antcom.de>
 *
 * Copyright (C) 2010 NXP Semiconductors
 * Copyright (C) 2012 Roland Stigge
 *
 * This controller supports square key matrices from 1x1 up to 8x8
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/input/matrix_keypad.h>

#define DRV_NAME				"lpc32xx_keys"

/*
 * Key scanner register offsets
 */
#define LPC32XX_KS_DEB(x)			((x) + 0x00)
#define LPC32XX_KS_STATE_COND(x)		((x) + 0x04)
#define LPC32XX_KS_IRQ(x)			((x) + 0x08)
#define LPC32XX_KS_SCAN_CTL(x)			((x) + 0x0C)
#define LPC32XX_KS_FAST_TST(x)			((x) + 0x10)
#define LPC32XX_KS_MATRIX_DIM(x)		((x) + 0x14) /* 1..8 */
#define LPC32XX_KS_DATA(x, y)			((x) + 0x40 + ((y) << 2))

#define LPC32XX_KSCAN_DEB_NUM_DEB_PASS(n)	((n) & 0xFF)

#define LPC32XX_KSCAN_SCOND_IN_IDLE		0x0
#define LPC32XX_KSCAN_SCOND_IN_SCANONCE		0x1
#define LPC32XX_KSCAN_SCOND_IN_IRQGEN		0x2
#define LPC32XX_KSCAN_SCOND_IN_SCAN_MATRIX	0x3

#define LPC32XX_KSCAN_IRQ_PENDING_CLR		0x1

#define LPC32XX_KSCAN_SCTRL_SCAN_DELAY(n)	((n) & 0xFF)

#define LPC32XX_KSCAN_FTST_FORCESCANONCE	0x1
#define LPC32XX_KSCAN_FTST_USE32K_CLK		0x2

#define LPC32XX_KSCAN_MSEL_SELECT(n)		((n) & 0xF)

struct lpc32xx_kscan_drv {
	struct input_dev *input;
	struct clk *clk;
	void __iomem *kscan_base;
	unsigned int irq;

	u32 matrix_sz;		/* Size of matrix in XxY, ie. 3 = 3x3 */
	u32 deb_clks;		/* Debounce clocks (based on 32KHz clock) */
	u32 scan_delay;		/* Scan delay (based on 32KHz clock) */

	unsigned short *keymap;	/* Pointer to key map for the scan matrix */
	unsigned int row_shift;

	u8 lastkeystates[8];
};

static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
{
	struct input_dev *input = kscandat->input;
	unsigned row, changed, scancode, keycode;
	u8 key;

	key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
	changed = key ^ kscandat->lastkeystates[col];
	kscandat->lastkeystates[col] = key;

	for (row = 0; changed; row++, changed >>= 1) {
		if (changed & 1) {
			/* Key state changed, signal an event */
			scancode = MATRIX_SCAN_CODE(row, col,
						    kscandat->row_shift);
			keycode = kscandat->keymap[scancode];
			input_event(input, EV_MSC, MSC_SCAN, scancode);
			input_report_key(input, keycode, key & (1 << row));
		}
	}
}

static irqreturn_t lpc32xx_kscan_irq(int irq, void *dev_id)
{
	struct lpc32xx_kscan_drv *kscandat = dev_id;
	int i;

	for (i = 0; i < kscandat->matrix_sz; i++)
		lpc32xx_mod_states(kscandat, i);

	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));

	input_sync(kscandat->input);

	return IRQ_HANDLED;
}

static int lpc32xx_kscan_open(struct input_dev *dev)
{
	struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
	int error;

	error = clk_prepare_enable(kscandat->clk);
	if (error)
		return error;

	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));

	return 0;
}

static void lpc32xx_kscan_close(struct input_dev *dev)
{
	struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);

	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	clk_disable_unprepare(kscandat->clk);
}

static int lpc32xx_parse_dt(struct device *dev,
				      struct lpc32xx_kscan_drv *kscandat)
{
	struct device_node *np = dev->of_node;
	u32 rows = 0, columns = 0;
	int err;

	err = matrix_keypad_parse_properties(dev, &rows, &columns);
	if (err)
		return err;
	if (rows != columns) {
		dev_err(dev, "rows and columns must be equal!\n");
		return -EINVAL;
	}

	kscandat->matrix_sz = rows;
	kscandat->row_shift = get_count_order(columns);

	of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);
	of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
	if (!kscandat->deb_clks || !kscandat->scan_delay) {
		dev_err(dev, "debounce or scan delay not specified\n");
		return -EINVAL;
	}

	return 0;
}

static int lpc32xx_kscan_probe(struct platform_device *pdev)
{
	struct lpc32xx_kscan_drv *kscandat;
	struct input_dev *input;
	struct resource *res;
	size_t keymap_size;
	int error;
	int irq;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "failed to get platform I/O memory\n");
		return -EINVAL;
	}

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

	kscandat = devm_kzalloc(&pdev->dev, sizeof(*kscandat),
				GFP_KERNEL);
	if (!kscandat)
		return -ENOMEM;

	error = lpc32xx_parse_dt(&pdev->dev, kscandat);
	if (error) {
		dev_err(&pdev->dev, "failed to parse device tree\n");
		return error;
	}

	keymap_size = sizeof(kscandat->keymap[0]) *
				(kscandat->matrix_sz << kscandat->row_shift);
	kscandat->keymap = devm_kzalloc(&pdev->dev, keymap_size, GFP_KERNEL);
	if (!kscandat->keymap)
		return -ENOMEM;

	kscandat->input = input = devm_input_allocate_device(&pdev->dev);
	if (!input) {
		dev_err(&pdev->dev, "failed to allocate input device\n");
		return -ENOMEM;
	}

	/* Setup key input */
	input->name		= pdev->name;
	input->phys		= "lpc32xx/input0";
	input->id.vendor	= 0x0001;
	input->id.product	= 0x0001;
	input->id.version	= 0x0100;
	input->open		= lpc32xx_kscan_open;
	input->close		= lpc32xx_kscan_close;
	input->dev.parent	= &pdev->dev;

	input_set_capability(input, EV_MSC, MSC_SCAN);

	error = matrix_keypad_build_keymap(NULL, NULL,
					   kscandat->matrix_sz,
					   kscandat->matrix_sz,
					   kscandat->keymap, kscandat->input);
	if (error) {
		dev_err(&pdev->dev, "failed to build keymap\n");
		return error;
	}

	input_set_drvdata(kscandat->input, kscandat);

	kscandat->kscan_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(kscandat->kscan_base))
		return PTR_ERR(kscandat->kscan_base);

	/* Get the key scanner clock */
	kscandat->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(kscandat->clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		return PTR_ERR(kscandat->clk);
	}

	/* Configure the key scanner */
	error = clk_prepare_enable(kscandat->clk);
	if (error)
		return error;

	writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));
	writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));
	writel(LPC32XX_KSCAN_FTST_USE32K_CLK,
	       LPC32XX_KS_FAST_TST(kscandat->kscan_base));
	writel(kscandat->matrix_sz,
	       LPC32XX_KS_MATRIX_DIM(kscandat->kscan_base));
	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	clk_disable_unprepare(kscandat->clk);

	error = devm_request_irq(&pdev->dev, irq, lpc32xx_kscan_irq, 0,
				 pdev->name, kscandat);
	if (error) {
		dev_err(&pdev->dev, "failed to request irq\n");
		return error;
	}

	error = input_register_device(kscandat->input);
	if (error) {
		dev_err(&pdev->dev, "failed to register input device\n");
		return error;
	}

	platform_set_drvdata(pdev, kscandat);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int lpc32xx_kscan_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
	struct input_dev *input = kscandat->input;

	mutex_lock(&input->mutex);

	if (input->users) {
		/* Clear IRQ and disable clock */
		writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
		clk_disable_unprepare(kscandat->clk);
	}

	mutex_unlock(&input->mutex);
	return 0;
}

static int lpc32xx_kscan_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
	struct input_dev *input = kscandat->input;
	int retval = 0;

	mutex_lock(&input->mutex);

	if (input->users) {
		/* Enable clock and clear IRQ */
		retval = clk_prepare_enable(kscandat->clk);
		if (retval == 0)
			writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	}

	mutex_unlock(&input->mutex);
	return retval;
}
#endif

static SIMPLE_DEV_PM_OPS(lpc32xx_kscan_pm_ops, lpc32xx_kscan_suspend,
			 lpc32xx_kscan_resume);

static const struct of_device_id lpc32xx_kscan_match[] = {
	{ .compatible = "nxp,lpc3220-key" },
	{},
};
MODULE_DEVICE_TABLE(of, lpc32xx_kscan_match);

static struct platform_driver lpc32xx_kscan_driver = {
	.probe		= lpc32xx_kscan_probe,
	.driver		= {
		.name	= DRV_NAME,
		.pm	= &lpc32xx_kscan_pm_ops,
		.of_match_table = lpc32xx_kscan_match,
	}
};

module_platform_driver(lpc32xx_kscan_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("Key scanner driver for LPC32XX devices");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
69690bec RS	2	/*
	3	* NXP LPC32xx SoC Key Scan Interface
	4	*
	5	* Authors:
	6	* Kevin Wells <kevin.wells@nxp.com>
	7	* Roland Stigge <stigge@antcom.de>
	8	*
	9	* Copyright (C) 2010 NXP Semiconductors
	10	* Copyright (C) 2012 Roland Stigge
	11	*
69690bec RS	12	* This controller supports square key matrices from 1x1 up to 8x8
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/slab.h>
	18	#include <linux/irq.h>
	19	#include <linux/pm.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/input.h>
	22	#include <linux/clk.h>
	23	#include <linux/io.h>
	24	#include <linux/of.h>
	25	#include <linux/input/matrix_keypad.h>
	26
	27	#define DRV_NAME "lpc32xx_keys"
	28
	29	/*
	30	* Key scanner register offsets
	31	*/
	32	#define LPC32XX_KS_DEB(x) ((x) + 0x00)
	33	#define LPC32XX_KS_STATE_COND(x) ((x) + 0x04)
	34	#define LPC32XX_KS_IRQ(x) ((x) + 0x08)
	35	#define LPC32XX_KS_SCAN_CTL(x) ((x) + 0x0C)
	36	#define LPC32XX_KS_FAST_TST(x) ((x) + 0x10)
	37	#define LPC32XX_KS_MATRIX_DIM(x) ((x) + 0x14) /* 1..8 */
	38	#define LPC32XX_KS_DATA(x, y) ((x) + 0x40 + ((y) << 2))
	39
	40	#define LPC32XX_KSCAN_DEB_NUM_DEB_PASS(n) ((n) & 0xFF)
	41
	42	#define LPC32XX_KSCAN_SCOND_IN_IDLE 0x0
	43	#define LPC32XX_KSCAN_SCOND_IN_SCANONCE 0x1
	44	#define LPC32XX_KSCAN_SCOND_IN_IRQGEN 0x2
	45	#define LPC32XX_KSCAN_SCOND_IN_SCAN_MATRIX 0x3
	46
	47	#define LPC32XX_KSCAN_IRQ_PENDING_CLR 0x1
	48
	49	#define LPC32XX_KSCAN_SCTRL_SCAN_DELAY(n) ((n) & 0xFF)
	50
	51	#define LPC32XX_KSCAN_FTST_FORCESCANONCE 0x1
	52	#define LPC32XX_KSCAN_FTST_USE32K_CLK 0x2
	53
	54	#define LPC32XX_KSCAN_MSEL_SELECT(n) ((n) & 0xF)
	55
	56	struct lpc32xx_kscan_drv {
	57	struct input_dev *input;
	58	struct clk *clk;
69690bec RS	59	void __iomem *kscan_base;
	60	unsigned int irq;
	61
	62	u32 matrix_sz; /* Size of matrix in XxY, ie. 3 = 3x3 */
	63	u32 deb_clks; /* Debounce clocks (based on 32KHz clock) */
	64	u32 scan_delay; /* Scan delay (based on 32KHz clock) */
	65
	66	unsigned short keymap; / Pointer to key map for the scan matrix */
	67	unsigned int row_shift;
	68
	69	u8 lastkeystates[8];
	70	};
	71
	72	static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
	73	{
	74	struct input_dev *input = kscandat->input;
	75	unsigned row, changed, scancode, keycode;
	76	u8 key;
	77
	78	key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
	79	changed = key ^ kscandat->lastkeystates[col];
	80	kscandat->lastkeystates[col] = key;
	81
	82	for (row = 0; changed; row++, changed >>= 1) {
	83	if (changed & 1) {
	84	/* Key state changed, signal an event */
	85	scancode = MATRIX_SCAN_CODE(row, col,
	86	kscandat->row_shift);
	87	keycode = kscandat->keymap[scancode];
	88	input_event(input, EV_MSC, MSC_SCAN, scancode);
	89	input_report_key(input, keycode, key & (1 << row));
	90	}
	91	}
	92	}
	93
	94	static irqreturn_t lpc32xx_kscan_irq(int irq, void *dev_id)
	95	{
	96	struct lpc32xx_kscan_drv *kscandat = dev_id;
	97	int i;
	98
	99	for (i = 0; i < kscandat->matrix_sz; i++)
	100	lpc32xx_mod_states(kscandat, i);
	101
	102	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	103
	104	input_sync(kscandat->input);
	105
	106	return IRQ_HANDLED;
	107	}
	108
	109	static int lpc32xx_kscan_open(struct input_dev *dev)
	110	{
	111	struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
	112	int error;
	113
	114	error = clk_prepare_enable(kscandat->clk);
	115	if (error)
	116	return error;
	117
	118	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	119
	120	return 0;
	121	}
	122
123	static void lpc32xx_kscan_close(struct input_dev *dev)
124	{
125	struct lpc32xx_kscan_drv *kscandat = input_get_drvdata(dev);
126
127	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
128	clk_disable_unprepare(kscandat->clk);
129	}
130
5298cc4c	131	static int lpc32xx_parse_dt(struct device *dev,
69690bec RS	132	struct lpc32xx_kscan_drv *kscandat)
	133	{
	134	struct device_node *np = dev->of_node;
	135	u32 rows = 0, columns = 0;
43840415	136	int err;
69690bec	137
aef01aad	138	err = matrix_keypad_parse_properties(dev, &rows, &columns);
43840415 SG	139	if (err)
	140	return err;
	141	if (rows != columns) {
	142	dev_err(dev, "rows and columns must be equal!\n");
69690bec RS	143	return -EINVAL;
	144	}
	145
	146	kscandat->matrix_sz = rows;
	147	kscandat->row_shift = get_count_order(columns);
	148
	149	of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);
	150	of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
	151	if (!kscandat->deb_clks \|\| !kscandat->scan_delay) {
	152	dev_err(dev, "debounce or scan delay not specified\n");
	153	return -EINVAL;
	154	}
	155
	156	return 0;
	157	}
	158
5298cc4c	159	static int lpc32xx_kscan_probe(struct platform_device *pdev)
69690bec RS	160	{
	161	struct lpc32xx_kscan_drv *kscandat;
	162	struct input_dev *input;
	163	struct resource *res;
	164	size_t keymap_size;
	165	int error;
	166	int irq;
	167
	168	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	169	if (!res) {
	170	dev_err(&pdev->dev, "failed to get platform I/O memory\n");
	171	return -EINVAL;
	172	}
	173
	174	irq = platform_get_irq(pdev, 0);
951a0864	175	if (irq < 0) {
69690bec RS	176	dev_err(&pdev->dev, "failed to get platform irq\n");
	177	return -EINVAL;
	178	}
	179
dae7aa8d PG	180	kscandat = devm_kzalloc(&pdev->dev, sizeof(*kscandat),
	181	GFP_KERNEL);
	182	if (!kscandat)
69690bec	183	return -ENOMEM;
69690bec RS	184
	185	error = lpc32xx_parse_dt(&pdev->dev, kscandat);
	186	if (error) {
	187	dev_err(&pdev->dev, "failed to parse device tree\n");
dae7aa8d	188	return error;
69690bec RS	189	}
	190
	191	keymap_size = sizeof(kscandat->keymap[0]) *
	192	(kscandat->matrix_sz << kscandat->row_shift);
dae7aa8d PG	193	kscandat->keymap = devm_kzalloc(&pdev->dev, keymap_size, GFP_KERNEL);
	194	if (!kscandat->keymap)
	195	return -ENOMEM;
69690bec	196
dae7aa8d	197	kscandat->input = input = devm_input_allocate_device(&pdev->dev);
69690bec RS	198	if (!input) {
69690bec RS	199	dev_err(&pdev->dev, "failed to allocate input device\n");
dae7aa8d	200	return -ENOMEM;
69690bec RS	201	}
	202
	203	/* Setup key input */
	204	input->name = pdev->name;
	205	input->phys = "lpc32xx/input0";
	206	input->id.vendor = 0x0001;
	207	input->id.product = 0x0001;
	208	input->id.version = 0x0100;
	209	input->open = lpc32xx_kscan_open;
	210	input->close = lpc32xx_kscan_close;
	211	input->dev.parent = &pdev->dev;
	212
	213	input_set_capability(input, EV_MSC, MSC_SCAN);
	214
	215	error = matrix_keypad_build_keymap(NULL, NULL,
	216	kscandat->matrix_sz,
	217	kscandat->matrix_sz,
	218	kscandat->keymap, kscandat->input);
	219	if (error) {
	220	dev_err(&pdev->dev, "failed to build keymap\n");
dae7aa8d	221	return error;
69690bec RS	222	}
	223
	224	input_set_drvdata(kscandat->input, kscandat);
	225
dae7aa8d PG	226	kscandat->kscan_base = devm_ioremap_resource(&pdev->dev, res);
	227	if (IS_ERR(kscandat->kscan_base))
	228	return PTR_ERR(kscandat->kscan_base);
69690bec RS	229
69690bec RS	230	/* Get the key scanner clock */
dae7aa8d	231	kscandat->clk = devm_clk_get(&pdev->dev, NULL);
69690bec RS	232	if (IS_ERR(kscandat->clk)) {
69690bec RS	233	dev_err(&pdev->dev, "failed to get clock\n");
dae7aa8d	234	return PTR_ERR(kscandat->clk);
69690bec RS	235	}
	236
	237	/* Configure the key scanner */
	238	error = clk_prepare_enable(kscandat->clk);
	239	if (error)
dae7aa8d	240	return error;
69690bec RS	241
	242	writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));
	243	writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));
	244	writel(LPC32XX_KSCAN_FTST_USE32K_CLK,
	245	LPC32XX_KS_FAST_TST(kscandat->kscan_base));
	246	writel(kscandat->matrix_sz,
	247	LPC32XX_KS_MATRIX_DIM(kscandat->kscan_base));
	248	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	249	clk_disable_unprepare(kscandat->clk);
	250
dae7aa8d PG	251	error = devm_request_irq(&pdev->dev, irq, lpc32xx_kscan_irq, 0,
dae7aa8d PG	252	pdev->name, kscandat);
69690bec RS	253	if (error) {
69690bec RS	254	dev_err(&pdev->dev, "failed to request irq\n");
dae7aa8d	255	return error;
69690bec RS	256	}
	257
	258	error = input_register_device(kscandat->input);
	259	if (error) {
	260	dev_err(&pdev->dev, "failed to register input device\n");
dae7aa8d	261	return error;
69690bec RS	262	}
	263
	264	platform_set_drvdata(pdev, kscandat);
69690bec RS	265
	266	return 0;
	267	}
	268
	269	#ifdef CONFIG_PM_SLEEP
	270	static int lpc32xx_kscan_suspend(struct device *dev)
	271	{
	272	struct platform_device *pdev = to_platform_device(dev);
	273	struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
	274	struct input_dev *input = kscandat->input;
	275
	276	mutex_lock(&input->mutex);
	277
	278	if (input->users) {
	279	/* Clear IRQ and disable clock */
	280	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	281	clk_disable_unprepare(kscandat->clk);
	282	}
	283
	284	mutex_unlock(&input->mutex);
	285	return 0;
	286	}
	287
	288	static int lpc32xx_kscan_resume(struct device *dev)
	289	{
	290	struct platform_device *pdev = to_platform_device(dev);
	291	struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
	292	struct input_dev *input = kscandat->input;
	293	int retval = 0;
	294
	295	mutex_lock(&input->mutex);
	296
	297	if (input->users) {
	298	/* Enable clock and clear IRQ */
	299	retval = clk_prepare_enable(kscandat->clk);
	300	if (retval == 0)
	301	writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
	302	}
	303
	304	mutex_unlock(&input->mutex);
	305	return retval;
	306	}
	307	#endif
	308
	309	static SIMPLE_DEV_PM_OPS(lpc32xx_kscan_pm_ops, lpc32xx_kscan_suspend,
	310	lpc32xx_kscan_resume);
	311
	312	static const struct of_device_id lpc32xx_kscan_match[] = {
	313	{ .compatible = "nxp,lpc3220-key" },
	314	{},
	315	};
	316	MODULE_DEVICE_TABLE(of, lpc32xx_kscan_match);
	317
	318	static struct platform_driver lpc32xx_kscan_driver = {
	319	.probe = lpc32xx_kscan_probe,
69690bec RS	320	.driver = {
69690bec RS	321	.name = DRV_NAME,
69690bec	322	.pm = &lpc32xx_kscan_pm_ops,
39116e26	323	.of_match_table = lpc32xx_kscan_match,
69690bec RS	324	}
	325	};
	326
	327	module_platform_driver(lpc32xx_kscan_driver);
	328
	329	MODULE_LICENSE("GPL");
	330	MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
	331	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	332	MODULE_DESCRIPTION("Key scanner driver for LPC32XX devices");