[deliverable/linux.git] / drivers / input / keyboard / nomadik-ske-keypad.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *
 * License terms:GNU General Public License (GPL) version 2
 *
 * Keypad controller driver for the SKE (Scroll Key Encoder) module used in
 * the Nomadik 8815 and Ux500 platforms.
 */

#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/module.h>

#include <plat/ske.h>

/* SKE_CR bits */
#define SKE_KPMLT	(0x1 << 6)
#define SKE_KPCN	(0x7 << 3)
#define SKE_KPASEN	(0x1 << 2)
#define SKE_KPASON	(0x1 << 7)

/* SKE_IMSC bits */
#define SKE_KPIMA	(0x1 << 2)

/* SKE_ICR bits */
#define SKE_KPICS	(0x1 << 3)
#define SKE_KPICA	(0x1 << 2)

/* SKE_RIS bits */
#define SKE_KPRISA	(0x1 << 2)

#define SKE_KEYPAD_ROW_SHIFT	3
#define SKE_KPD_NUM_ROWS	8
#define SKE_KPD_NUM_COLS	8

/* keypad auto scan registers */
#define SKE_ASR0	0x20
#define SKE_ASR1	0x24
#define SKE_ASR2	0x28
#define SKE_ASR3	0x2C

#define SKE_NUM_ASRX_REGISTERS	(4)

/**
 * struct ske_keypad  - data structure used by keypad driver
 * @irq:	irq no
 * @reg_base:	ske regsiters base address
 * @input:	pointer to input device object
 * @board:	keypad platform device
 * @keymap:	matrix scan code table for keycodes
 * @clk:	clock structure pointer
 */
struct ske_keypad {
	int irq;
	void __iomem *reg_base;
	struct input_dev *input;
	const struct ske_keypad_platform_data *board;
	unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
	struct clk *clk;
	spinlock_t ske_keypad_lock;
};

static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
		u8 mask, u8 data)
{
	u32 ret;

	spin_lock(&keypad->ske_keypad_lock);

	ret = readl(keypad->reg_base + addr);
	ret &= ~mask;
	ret |= data;
	writel(ret, keypad->reg_base + addr);

	spin_unlock(&keypad->ske_keypad_lock);
}

/*
 * ske_keypad_chip_init: init keypad controller configuration
 *
 * Enable Multi key press detection, auto scan mode
 */
static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
{
	u32 value;
	int timeout = 50;

	/* check SKE_RIS to be 0 */
	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
		cpu_relax();

	if (!timeout)
		return -EINVAL;

	/*
	 * set debounce value
	 * keypad dbounce is configured in DBCR[15:8]
	 * dbounce value in steps of 32/32.768 ms
	 */
	spin_lock(&keypad->ske_keypad_lock);
	value = readl(keypad->reg_base + SKE_DBCR);
	value = value & 0xff;
	value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
	writel(value, keypad->reg_base + SKE_DBCR);
	spin_unlock(&keypad->ske_keypad_lock);

	/* enable multi key detection */
	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);

	/*
	 * set up the number of columns
	 * KPCN[5:3] defines no. of keypad columns to be auto scanned
	 */
	value = (keypad->board->kcol - 1) << 3;
	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);

	/* clear keypad interrupt for auto(and pending SW) scans */
	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);

	/* un-mask keypad interrupts */
	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);

	/* enable automatic scan */
	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);

	return 0;
}

static void ske_keypad_read_data(struct ske_keypad *keypad)
{
	struct input_dev *input = keypad->input;
	u16 status;
	int col = 0, row = 0, code;
	int ske_asr, ske_ris, key_pressed, i;

	/*
	 * Read the auto scan registers
	 *
	 * Each SKE_ASRx (x=0 to x=3) contains two row values.
	 * lower byte contains row value for column 2*x,
	 * upper byte contains row value for column 2*x + 1
	 */
	for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
		ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
		if (!ske_asr)
			continue;

		/* now that ASRx is zero, find out the column x and row y*/
		if (ske_asr & 0xff) {
			col = i * 2;
			status = ske_asr & 0xff;
		} else {
			col = (i * 2) + 1;
			status = (ske_asr & 0xff00) >> 8;
		}

		/* find out the row */
		row = __ffs(status);

		code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
		ske_ris = readl(keypad->reg_base + SKE_RIS);
		key_pressed = ske_ris & SKE_KPRISA;

		input_event(input, EV_MSC, MSC_SCAN, code);
		input_report_key(input, keypad->keymap[code], key_pressed);
		input_sync(input);
	}
}

static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
{
	struct ske_keypad *keypad = dev_id;
	int retries = 20;

	/* disable auto scan interrupt; mask the interrupt generated */
	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);

	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --retries)
		msleep(5);

	if (retries) {
		/* SKEx registers are stable and can be read */
		ske_keypad_read_data(keypad);
	}

	/* enable auto scan interrupts */
	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);

	return IRQ_HANDLED;
}

static int __init ske_keypad_probe(struct platform_device *pdev)
{
	const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
	struct ske_keypad *keypad;
	struct input_dev *input;
	struct resource *res;
	int irq;
	int error;

	if (!plat) {
		dev_err(&pdev->dev, "invalid keypad platform data\n");
		return -EINVAL;
	}

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "missing platform resources\n");
		return -EINVAL;
	}

	keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
	input = input_allocate_device();
	if (!keypad || !input) {
		dev_err(&pdev->dev, "failed to allocate keypad memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	keypad->irq = irq;
	keypad->board = plat;
	keypad->input = input;
	spin_lock_init(&keypad->ske_keypad_lock);

	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		error = -EBUSY;
		goto err_free_mem;
	}

	keypad->reg_base = ioremap(res->start, resource_size(res));
	if (!keypad->reg_base) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		error = -ENXIO;
		goto err_free_mem_region;
	}

	keypad->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(keypad->clk)) {
		dev_err(&pdev->dev, "failed to get clk\n");
		error = PTR_ERR(keypad->clk);
		goto err_iounmap;
	}

	input->id.bustype = BUS_HOST;
	input->name = "ux500-ske-keypad";
	input->dev.parent = &pdev->dev;

	error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
					   SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
					   keypad->keymap, input);
	if (error) {
		dev_err(&pdev->dev, "Failed to build keymap\n");
		goto err_iounmap;
	}

	input_set_capability(input, EV_MSC, MSC_SCAN);
	if (!plat->no_autorepeat)
		__set_bit(EV_REP, input->evbit);

	clk_enable(keypad->clk);

	/* go through board initialization helpers */
	if (keypad->board->init)
		keypad->board->init();

	error = ske_keypad_chip_init(keypad);
	if (error) {
		dev_err(&pdev->dev, "unable to init keypad hardware\n");
		goto err_clk_disable;
	}

	error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
				     IRQF_ONESHOT, "ske-keypad", keypad);
	if (error) {
		dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
		goto err_clk_disable;
	}

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev,
				"unable to register input device: %d\n", error);
		goto err_free_irq;
	}

	if (plat->wakeup_enable)
		device_init_wakeup(&pdev->dev, true);

	platform_set_drvdata(pdev, keypad);

	return 0;

err_free_irq:
	free_irq(keypad->irq, keypad);
err_clk_disable:
	clk_disable(keypad->clk);
	clk_put(keypad->clk);
err_iounmap:
	iounmap(keypad->reg_base);
err_free_mem_region:
	release_mem_region(res->start, resource_size(res));
err_free_mem:
	input_free_device(input);
	kfree(keypad);
	return error;
}

static int __devexit ske_keypad_remove(struct platform_device *pdev)
{
	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	free_irq(keypad->irq, keypad);

	input_unregister_device(keypad->input);

	clk_disable(keypad->clk);
	clk_put(keypad->clk);

	if (keypad->board->exit)
		keypad->board->exit();

	iounmap(keypad->reg_base);
	release_mem_region(res->start, resource_size(res));
	kfree(keypad);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int ske_keypad_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	if (device_may_wakeup(dev))
		enable_irq_wake(irq);
	else
		ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);

	return 0;
}

static int ske_keypad_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	if (device_may_wakeup(dev))
		disable_irq_wake(irq);
	else
		ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
			 ske_keypad_suspend, ske_keypad_resume);

static struct platform_driver ske_keypad_driver = {
	.driver = {
		.name = "nmk-ske-keypad",
		.owner  = THIS_MODULE,
		.pm = &ske_keypad_dev_pm_ops,
	},
	.remove = __devexit_p(ske_keypad_remove),
};

static int __init ske_keypad_init(void)
{
	return platform_driver_probe(&ske_keypad_driver, ske_keypad_probe);
}
module_init(ske_keypad_init);

static void __exit ske_keypad_exit(void)
{
	platform_driver_unregister(&ske_keypad_driver);
}
module_exit(ske_keypad_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
MODULE_ALIAS("platform:nomadik-ske-keypad");
Commit	Line	Data
1158f0f1 SI	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	*
	4	* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
	5	* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
	6	*
	7	* License terms:GNU General Public License (GPL) version 2
	8	*
	9	* Keypad controller driver for the SKE (Scroll Key Encoder) module used in
	10	* the Nomadik 8815 and Ux500 platforms.
	11	*/
	12
	13	#include <linux/platform_device.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/spinlock.h>
	16	#include <linux/io.h>
	17	#include <linux/delay.h>
	18	#include <linux/input.h>
	19	#include <linux/slab.h>
	20	#include <linux/clk.h>
d2d8442d	21	#include <linux/module.h>
1158f0f1 SI	22
	23	#include <plat/ske.h>
	24
	25	/* SKE_CR bits */
	26	#define SKE_KPMLT (0x1 << 6)
	27	#define SKE_KPCN (0x7 << 3)
	28	#define SKE_KPASEN (0x1 << 2)
	29	#define SKE_KPASON (0x1 << 7)
	30
	31	/* SKE_IMSC bits */
	32	#define SKE_KPIMA (0x1 << 2)
	33
	34	/* SKE_ICR bits */
	35	#define SKE_KPICS (0x1 << 3)
	36	#define SKE_KPICA (0x1 << 2)
	37
	38	/* SKE_RIS bits */
	39	#define SKE_KPRISA (0x1 << 2)
	40
	41	#define SKE_KEYPAD_ROW_SHIFT 3
1932811f DT	42	#define SKE_KPD_NUM_ROWS 8
1932811f DT	43	#define SKE_KPD_NUM_COLS 8
1158f0f1 SI	44
	45	/* keypad auto scan registers */
	46	#define SKE_ASR0 0x20
	47	#define SKE_ASR1 0x24
	48	#define SKE_ASR2 0x28
	49	#define SKE_ASR3 0x2C
	50
	51	#define SKE_NUM_ASRX_REGISTERS (4)
	52
	53	/**
	54	* struct ske_keypad - data structure used by keypad driver
	55	* @irq: irq no
	56	* @reg_base: ske regsiters base address
	57	* @input: pointer to input device object
	58	* @board: keypad platform device
	59	* @keymap: matrix scan code table for keycodes
	60	* @clk: clock structure pointer
	61	*/
	62	struct ske_keypad {
	63	int irq;
	64	void __iomem *reg_base;
	65	struct input_dev *input;
	66	const struct ske_keypad_platform_data *board;
1932811f	67	unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
1158f0f1 SI	68	struct clk *clk;
	69	spinlock_t ske_keypad_lock;
	70	};
	71
	72	static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
	73	u8 mask, u8 data)
	74	{
	75	u32 ret;
	76
	77	spin_lock(&keypad->ske_keypad_lock);
	78
	79	ret = readl(keypad->reg_base + addr);
	80	ret &= ~mask;
	81	ret \|= data;
	82	writel(ret, keypad->reg_base + addr);
	83
	84	spin_unlock(&keypad->ske_keypad_lock);
	85	}
	86
	87	/*
	88	* ske_keypad_chip_init: init keypad controller configuration
	89	*
	90	* Enable Multi key press detection, auto scan mode
	91	*/
db3dbd09	92	static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
1158f0f1 SI	93	{
	94	u32 value;
	95	int timeout = 50;
	96
	97	/* check SKE_RIS to be 0 */
	98	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
	99	cpu_relax();
	100
	101	if (!timeout)
	102	return -EINVAL;
	103
	104	/*
	105	* set debounce value
	106	* keypad dbounce is configured in DBCR[15:8]
	107	* dbounce value in steps of 32/32.768 ms
	108	*/
	109	spin_lock(&keypad->ske_keypad_lock);
	110	value = readl(keypad->reg_base + SKE_DBCR);
	111	value = value & 0xff;
	112	value \|= ((keypad->board->debounce_ms * 32000)/32768) << 8;
	113	writel(value, keypad->reg_base + SKE_DBCR);
	114	spin_unlock(&keypad->ske_keypad_lock);
	115
	116	/* enable multi key detection */
	117	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
	118
	119	/*
	120	* set up the number of columns
	121	* KPCN[5:3] defines no. of keypad columns to be auto scanned
	122	*/
	123	value = (keypad->board->kcol - 1) << 3;
	124	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
	125
	126	/* clear keypad interrupt for auto(and pending SW) scans */
	127	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA \| SKE_KPICS);
	128
	129	/* un-mask keypad interrupts */
	130	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	131
	132	/* enable automatic scan */
	133	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
	134
	135	return 0;
	136	}
	137
	138	static void ske_keypad_read_data(struct ske_keypad *keypad)
	139	{
	140	struct input_dev *input = keypad->input;
	141	u16 status;
	142	int col = 0, row = 0, code;
	143	int ske_asr, ske_ris, key_pressed, i;
	144
	145	/*
	146	* Read the auto scan registers
	147	*
	148	* Each SKE_ASRx (x=0 to x=3) contains two row values.
	149	* lower byte contains row value for column 2*x,
	150	* upper byte contains row value for column 2*x + 1
	151	*/
	152	for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
	153	ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
	154	if (!ske_asr)
	155	continue;
	156
157	/* now that ASRx is zero, find out the column x and row y*/
158	if (ske_asr & 0xff) {
159	col = i * 2;
160	status = ske_asr & 0xff;
161	} else {
162	col = (i * 2) + 1;
163	status = (ske_asr & 0xff00) >> 8;
164	}
165
166	/* find out the row */
167	row = __ffs(status);
168
169	code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
170	ske_ris = readl(keypad->reg_base + SKE_RIS);
171	key_pressed = ske_ris & SKE_KPRISA;
172
173	input_event(input, EV_MSC, MSC_SCAN, code);
174	input_report_key(input, keypad->keymap[code], key_pressed);
175	input_sync(input);
176	}
177	}
178
179	static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
180	{
181	struct ske_keypad *keypad = dev_id;
182	int retries = 20;
183
184	/* disable auto scan interrupt; mask the interrupt generated */
185	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
186	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
187
188	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --retries)
189	msleep(5);
190
191	if (retries) {
192	/* SKEx registers are stable and can be read */
193	ske_keypad_read_data(keypad);
194	}
195
196	/* enable auto scan interrupts */
197	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
198
199	return IRQ_HANDLED;
200	}
201
db3dbd09	202	static int __init ske_keypad_probe(struct platform_device *pdev)
1158f0f1 SI	203	{
	204	const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
	205	struct ske_keypad *keypad;
	206	struct input_dev *input;
	207	struct resource *res;
	208	int irq;
	209	int error;
	210
	211	if (!plat) {
	212	dev_err(&pdev->dev, "invalid keypad platform data\n");
	213	return -EINVAL;
	214	}
	215
	216	irq = platform_get_irq(pdev, 0);
	217	if (irq < 0) {
	218	dev_err(&pdev->dev, "failed to get keypad irq\n");
	219	return -EINVAL;
	220	}
	221
	222	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	223	if (!res) {
	224	dev_err(&pdev->dev, "missing platform resources\n");
	225	return -EINVAL;
	226	}
	227
	228	keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
	229	input = input_allocate_device();
	230	if (!keypad \|\| !input) {
	231	dev_err(&pdev->dev, "failed to allocate keypad memory\n");
	232	error = -ENOMEM;
	233	goto err_free_mem;
	234	}
	235
	236	keypad->irq = irq;
	237	keypad->board = plat;
	238	keypad->input = input;
	239	spin_lock_init(&keypad->ske_keypad_lock);
	240
	241	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	242	dev_err(&pdev->dev, "failed to request I/O memory\n");
	243	error = -EBUSY;
	244	goto err_free_mem;
	245	}
	246
	247	keypad->reg_base = ioremap(res->start, resource_size(res));
	248	if (!keypad->reg_base) {
	249	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	250	error = -ENXIO;
	251	goto err_free_mem_region;
	252	}
	253
	254	keypad->clk = clk_get(&pdev->dev, NULL);
	255	if (IS_ERR(keypad->clk)) {
	256	dev_err(&pdev->dev, "failed to get clk\n");
	257	error = PTR_ERR(keypad->clk);
	258	goto err_iounmap;
	259	}
	260
	261	input->id.bustype = BUS_HOST;
	262	input->name = "ux500-ske-keypad";
	263	input->dev.parent = &pdev->dev;
	264
1932811f DT	265	error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
	266	SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
	267	keypad->keymap, input);
	268	if (error) {
	269	dev_err(&pdev->dev, "Failed to build keymap\n");
	270	goto err_iounmap;
	271	}
1158f0f1 SI	272
1158f0f1 SI	273	input_set_capability(input, EV_MSC, MSC_SCAN);
1158f0f1 SI	274	if (!plat->no_autorepeat)
	275	__set_bit(EV_REP, input->evbit);
	276
1158f0f1 SI	277	clk_enable(keypad->clk);
	278
	279	/* go through board initialization helpers */
	280	if (keypad->board->init)
	281	keypad->board->init();
	282
	283	error = ske_keypad_chip_init(keypad);
	284	if (error) {
	285	dev_err(&pdev->dev, "unable to init keypad hardware\n");
	286	goto err_clk_disable;
	287	}
	288
	289	error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
	290	IRQF_ONESHOT, "ske-keypad", keypad);
	291	if (error) {
	292	dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
	293	goto err_clk_disable;
	294	}
	295
	296	error = input_register_device(input);
	297	if (error) {
	298	dev_err(&pdev->dev,
	299	"unable to register input device: %d\n", error);
	300	goto err_free_irq;
	301	}
	302
	303	if (plat->wakeup_enable)
	304	device_init_wakeup(&pdev->dev, true);
	305
	306	platform_set_drvdata(pdev, keypad);
	307
	308	return 0;
	309
	310	err_free_irq:
	311	free_irq(keypad->irq, keypad);
	312	err_clk_disable:
	313	clk_disable(keypad->clk);
	314	clk_put(keypad->clk);
	315	err_iounmap:
	316	iounmap(keypad->reg_base);
	317	err_free_mem_region:
	318	release_mem_region(res->start, resource_size(res));
	319	err_free_mem:
	320	input_free_device(input);
	321	kfree(keypad);
	322	return error;
	323	}
	324
	325	static int __devexit ske_keypad_remove(struct platform_device *pdev)
	326	{
	327	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	328	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	329
	330	free_irq(keypad->irq, keypad);
	331
	332	input_unregister_device(keypad->input);
	333
	334	clk_disable(keypad->clk);
	335	clk_put(keypad->clk);
	336
	337	if (keypad->board->exit)
	338	keypad->board->exit();
	339
	340	iounmap(keypad->reg_base);
341	release_mem_region(res->start, resource_size(res));
342	kfree(keypad);
343
344	return 0;
345	}
346
89f0f170	347	#ifdef CONFIG_PM_SLEEP
1158f0f1 SI	348	static int ske_keypad_suspend(struct device *dev)
	349	{
	350	struct platform_device *pdev = to_platform_device(dev);
	351	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	352	int irq = platform_get_irq(pdev, 0);
	353
	354	if (device_may_wakeup(dev))
	355	enable_irq_wake(irq);
	356	else
	357	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	358
	359	return 0;
	360	}
	361
	362	static int ske_keypad_resume(struct device *dev)
	363	{
	364	struct platform_device *pdev = to_platform_device(dev);
	365	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	366	int irq = platform_get_irq(pdev, 0);
	367
	368	if (device_may_wakeup(dev))
	369	disable_irq_wake(irq);
	370	else
	371	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	372
	373	return 0;
	374	}
1158f0f1 SI	375	#endif
1158f0f1 SI	376
89f0f170 DT	377	static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
	378	ske_keypad_suspend, ske_keypad_resume);
	379
aeec0517	380	static struct platform_driver ske_keypad_driver = {
1158f0f1 SI	381	.driver = {
	382	.name = "nmk-ske-keypad",
	383	.owner = THIS_MODULE,
1158f0f1	384	.pm = &ske_keypad_dev_pm_ops,
1158f0f1	385	},
1158f0f1 SI	386	.remove = __devexit_p(ske_keypad_remove),
1158f0f1 SI	387	};
d3d25808 DT	388
	389	static int __init ske_keypad_init(void)
	390	{
	391	return platform_driver_probe(&ske_keypad_driver, ske_keypad_probe);
	392	}
	393	module_init(ske_keypad_init);
	394
	395	static void __exit ske_keypad_exit(void)
	396	{
	397	platform_driver_unregister(&ske_keypad_driver);
	398	}
	399	module_exit(ske_keypad_exit);
1158f0f1 SI	400
	401	MODULE_LICENSE("GPL v2");
	402	MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
	403	MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
	404	MODULE_ALIAS("platform:nomadik-ske-keypad");