[mirror_ubuntu-zesty-kernel.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 <linux/platform_data/keypad-nomadik-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)
#define	KEY_PRESSED_DELAY	10

/**
 * 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 = keypad->board->debounce_ms;

	/* 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_report(struct ske_keypad *keypad, u8 status, int col)
{
	int row = 0, code, pos;
	struct input_dev *input = keypad->input;
	u32 ske_ris;
	int key_pressed;
	int num_of_rows;

	/* find out the row */
	num_of_rows = hweight8(status);
	do {
		pos = __ffs(status);
		row = pos;
		status &= ~(1 << pos);

		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);
		num_of_rows--;
	} while (num_of_rows);
}

static void ske_keypad_read_data(struct ske_keypad *keypad)
{
	u8 status;
	int col = 0;
	int ske_asr, 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 coloumn x and row y */
		status = ske_asr & 0xff;
		if (status) {
			col = i * 2;
			ske_keypad_report(keypad, status, col);
		}
		status = (ske_asr & 0xff00) >> 8;
		if (status) {
			col = (i * 2) + 1;
			ske_keypad_report(keypad, status, col);
		}
	}
}

static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
{
	struct ske_keypad *keypad = dev_id;
	int timeout = keypad->board->debounce_ms;

	/* 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) && --timeout)
		cpu_relax();

	/* SKEx registers are stable and can be read */
	ske_keypad_read_data(keypad);

	/* wait until raw interrupt is clear */
	while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
		msleep(KEY_PRESSED_DELAY);

	/* 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_clk;
	}

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

	error = clk_prepare_enable(keypad->clk);
	if (error) {
		dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
		goto err_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_unprepare(keypad->clk);
err_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_unprepare(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	22
db298da2	23	#include <linux/platform_data/keypad-nomadik-ske.h>
1158f0f1 SI	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)
84b63ad8	52	#define KEY_PRESSED_DELAY 10
1158f0f1 SI	53
	54	/**
	55	* struct ske_keypad - data structure used by keypad driver
	56	* @irq: irq no
	57	* @reg_base: ske regsiters base address
	58	* @input: pointer to input device object
	59	* @board: keypad platform device
	60	* @keymap: matrix scan code table for keycodes
	61	* @clk: clock structure pointer
	62	*/
	63	struct ske_keypad {
	64	int irq;
	65	void __iomem *reg_base;
	66	struct input_dev *input;
	67	const struct ske_keypad_platform_data *board;
1932811f	68	unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
1158f0f1 SI	69	struct clk *clk;
	70	spinlock_t ske_keypad_lock;
	71	};
	72
	73	static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
	74	u8 mask, u8 data)
	75	{
	76	u32 ret;
	77
	78	spin_lock(&keypad->ske_keypad_lock);
	79
	80	ret = readl(keypad->reg_base + addr);
	81	ret &= ~mask;
	82	ret \|= data;
	83	writel(ret, keypad->reg_base + addr);
	84
	85	spin_unlock(&keypad->ske_keypad_lock);
	86	}
	87
	88	/*
	89	* ske_keypad_chip_init: init keypad controller configuration
	90	*
	91	* Enable Multi key press detection, auto scan mode
	92	*/
db3dbd09	93	static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
1158f0f1 SI	94	{
1158f0f1 SI	95	u32 value;
84b63ad8	96	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	97
	98	/* check SKE_RIS to be 0 */
	99	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
	100	cpu_relax();
	101
	102	if (!timeout)
	103	return -EINVAL;
	104
	105	/*
	106	* set debounce value
	107	* keypad dbounce is configured in DBCR[15:8]
	108	* dbounce value in steps of 32/32.768 ms
	109	*/
	110	spin_lock(&keypad->ske_keypad_lock);
	111	value = readl(keypad->reg_base + SKE_DBCR);
	112	value = value & 0xff;
	113	value \|= ((keypad->board->debounce_ms * 32000)/32768) << 8;
	114	writel(value, keypad->reg_base + SKE_DBCR);
	115	spin_unlock(&keypad->ske_keypad_lock);
	116
	117	/* enable multi key detection */
	118	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
	119
	120	/*
	121	* set up the number of columns
	122	* KPCN[5:3] defines no. of keypad columns to be auto scanned
	123	*/
	124	value = (keypad->board->kcol - 1) << 3;
	125	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
	126
	127	/* clear keypad interrupt for auto(and pending SW) scans */
	128	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA \| SKE_KPICS);
	129
	130	/* un-mask keypad interrupts */
	131	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	132
	133	/* enable automatic scan */
	134	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
	135
	136	return 0;
	137	}
	138
af77c88b	139	static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
1158f0f1	140	{
af77c88b	141	int row = 0, code, pos;
1158f0f1	142	struct input_dev *input = keypad->input;
af77c88b NKG	143	u32 ske_ris;
	144	int key_pressed;
	145	int num_of_rows;
	146
	147	/* find out the row */
	148	num_of_rows = hweight8(status);
	149	do {
	150	pos = __ffs(status);
	151	row = pos;
	152	status &= ~(1 << pos);
	153
	154	code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
	155	ske_ris = readl(keypad->reg_base + SKE_RIS);
	156	key_pressed = ske_ris & SKE_KPRISA;
	157
	158	input_event(input, EV_MSC, MSC_SCAN, code);
	159	input_report_key(input, keypad->keymap[code], key_pressed);
	160	input_sync(input);
	161	num_of_rows--;
	162	} while (num_of_rows);
	163	}
	164
	165	static void ske_keypad_read_data(struct ske_keypad *keypad)
	166	{
	167	u8 status;
	168	int col = 0;
	169	int ske_asr, i;
1158f0f1 SI	170
	171	/*
	172	* Read the auto scan registers
	173	*
	174	* Each SKE_ASRx (x=0 to x=3) contains two row values.
	175	* lower byte contains row value for column 2*x,
	176	* upper byte contains row value for column 2*x + 1
	177	*/
	178	for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
	179	ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
	180	if (!ske_asr)
	181	continue;
	182
af77c88b NKG	183	/* now that ASRx is zero, find out the coloumn x and row y */
	184	status = ske_asr & 0xff;
	185	if (status) {
1158f0f1	186	col = i * 2;
af77c88b NKG	187	ske_keypad_report(keypad, status, col);
	188	}
	189	status = (ske_asr & 0xff00) >> 8;
	190	if (status) {
1158f0f1	191	col = (i * 2) + 1;
af77c88b	192	ske_keypad_report(keypad, status, col);
1158f0f1	193	}
1158f0f1 SI	194	}
	195	}
	196
	197	static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
	198	{
	199	struct ske_keypad *keypad = dev_id;
84b63ad8	200	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	201
	202	/* disable auto scan interrupt; mask the interrupt generated */
	203	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	204	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
	205
84b63ad8	206	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
af77c88b	207	cpu_relax();
1158f0f1	208
af77c88b NKG	209	/* SKEx registers are stable and can be read */
af77c88b NKG	210	ske_keypad_read_data(keypad);
1158f0f1	211
84b63ad8 NKG	212	/* wait until raw interrupt is clear */
	213	while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
	214	msleep(KEY_PRESSED_DELAY);
	215
1158f0f1 SI	216	/* enable auto scan interrupts */
	217	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	218
	219	return IRQ_HANDLED;
	220	}
	221
db3dbd09	222	static int __init ske_keypad_probe(struct platform_device *pdev)
1158f0f1 SI	223	{
	224	const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
	225	struct ske_keypad *keypad;
	226	struct input_dev *input;
	227	struct resource *res;
	228	int irq;
	229	int error;
	230
	231	if (!plat) {
	232	dev_err(&pdev->dev, "invalid keypad platform data\n");
	233	return -EINVAL;
	234	}
	235
	236	irq = platform_get_irq(pdev, 0);
	237	if (irq < 0) {
	238	dev_err(&pdev->dev, "failed to get keypad irq\n");
	239	return -EINVAL;
	240	}
	241
	242	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	243	if (!res) {
	244	dev_err(&pdev->dev, "missing platform resources\n");
	245	return -EINVAL;
	246	}
	247
	248	keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
	249	input = input_allocate_device();
	250	if (!keypad \|\| !input) {
	251	dev_err(&pdev->dev, "failed to allocate keypad memory\n");
	252	error = -ENOMEM;
	253	goto err_free_mem;
	254	}
	255
	256	keypad->irq = irq;
	257	keypad->board = plat;
	258	keypad->input = input;
	259	spin_lock_init(&keypad->ske_keypad_lock);
	260
	261	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	262	dev_err(&pdev->dev, "failed to request I/O memory\n");
	263	error = -EBUSY;
	264	goto err_free_mem;
	265	}
	266
	267	keypad->reg_base = ioremap(res->start, resource_size(res));
	268	if (!keypad->reg_base) {
	269	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	270	error = -ENXIO;
	271	goto err_free_mem_region;
	272	}
	273
	274	keypad->clk = clk_get(&pdev->dev, NULL);
	275	if (IS_ERR(keypad->clk)) {
	276	dev_err(&pdev->dev, "failed to get clk\n");
	277	error = PTR_ERR(keypad->clk);
	278	goto err_iounmap;
	279	}
	280
	281	input->id.bustype = BUS_HOST;
	282	input->name = "ux500-ske-keypad";
	283	input->dev.parent = &pdev->dev;
	284
1932811f DT	285	error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
	286	SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
	287	keypad->keymap, input);
	288	if (error) {
	289	dev_err(&pdev->dev, "Failed to build keymap\n");
4e99aab7	290	goto err_clk;
1932811f	291	}
1158f0f1 SI	292
1158f0f1 SI	293	input_set_capability(input, EV_MSC, MSC_SCAN);
1158f0f1 SI	294	if (!plat->no_autorepeat)
	295	__set_bit(EV_REP, input->evbit);
	296
4e99aab7 UH	297	error = clk_prepare_enable(keypad->clk);
	298	if (error) {
	299	dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
	300	goto err_clk;
	301	}
	302
1158f0f1 SI	303
	304	/* go through board initialization helpers */
	305	if (keypad->board->init)
	306	keypad->board->init();
	307
	308	error = ske_keypad_chip_init(keypad);
	309	if (error) {
	310	dev_err(&pdev->dev, "unable to init keypad hardware\n");
	311	goto err_clk_disable;
	312	}
	313
	314	error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
	315	IRQF_ONESHOT, "ske-keypad", keypad);
	316	if (error) {
	317	dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
	318	goto err_clk_disable;
	319	}
	320
	321	error = input_register_device(input);
	322	if (error) {
	323	dev_err(&pdev->dev,
	324	"unable to register input device: %d\n", error);
	325	goto err_free_irq;
	326	}
	327
	328	if (plat->wakeup_enable)
	329	device_init_wakeup(&pdev->dev, true);
	330
	331	platform_set_drvdata(pdev, keypad);
	332
	333	return 0;
	334
	335	err_free_irq:
	336	free_irq(keypad->irq, keypad);
	337	err_clk_disable:
4e99aab7 UH	338	clk_disable_unprepare(keypad->clk);
4e99aab7 UH	339	err_clk:
1158f0f1 SI	340	clk_put(keypad->clk);
	341	err_iounmap:
	342	iounmap(keypad->reg_base);
	343	err_free_mem_region:
	344	release_mem_region(res->start, resource_size(res));
	345	err_free_mem:
	346	input_free_device(input);
	347	kfree(keypad);
	348	return error;
	349	}
	350
	351	static int __devexit ske_keypad_remove(struct platform_device *pdev)
	352	{
	353	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	354	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	355
	356	free_irq(keypad->irq, keypad);
	357
	358	input_unregister_device(keypad->input);
	359
4e99aab7	360	clk_disable_unprepare(keypad->clk);
1158f0f1 SI	361	clk_put(keypad->clk);
	362
	363	if (keypad->board->exit)
	364	keypad->board->exit();
	365
	366	iounmap(keypad->reg_base);
	367	release_mem_region(res->start, resource_size(res));
	368	kfree(keypad);
	369
	370	return 0;
	371	}
	372
89f0f170	373	#ifdef CONFIG_PM_SLEEP
1158f0f1 SI	374	static int ske_keypad_suspend(struct device *dev)
	375	{
	376	struct platform_device *pdev = to_platform_device(dev);
	377	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	378	int irq = platform_get_irq(pdev, 0);
	379
	380	if (device_may_wakeup(dev))
	381	enable_irq_wake(irq);
	382	else
	383	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	384
	385	return 0;
	386	}
	387
	388	static int ske_keypad_resume(struct device *dev)
	389	{
	390	struct platform_device *pdev = to_platform_device(dev);
	391	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	392	int irq = platform_get_irq(pdev, 0);
	393
	394	if (device_may_wakeup(dev))
	395	disable_irq_wake(irq);
	396	else
	397	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	398
	399	return 0;
	400	}
1158f0f1 SI	401	#endif
1158f0f1 SI	402
89f0f170 DT	403	static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
	404	ske_keypad_suspend, ske_keypad_resume);
	405
aeec0517	406	static struct platform_driver ske_keypad_driver = {
1158f0f1 SI	407	.driver = {
	408	.name = "nmk-ske-keypad",
	409	.owner = THIS_MODULE,
1158f0f1	410	.pm = &ske_keypad_dev_pm_ops,
1158f0f1	411	},
1158f0f1 SI	412	.remove = __devexit_p(ske_keypad_remove),
1158f0f1 SI	413	};
d3d25808 DT	414
	415	static int __init ske_keypad_init(void)
	416	{
	417	return platform_driver_probe(&ske_keypad_driver, ske_keypad_probe);
	418	}
	419	module_init(ske_keypad_init);
	420
	421	static void __exit ske_keypad_exit(void)
	422	{
	423	platform_driver_unregister(&ske_keypad_driver);
	424	}
	425	module_exit(ske_keypad_exit);
1158f0f1 SI	426
	427	MODULE_LICENSE("GPL v2");
	428	MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
	429	MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
	430	MODULE_ALIAS("platform:nomadik-ske-keypad");