[mirror_ubuntu-jammy-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;
	struct clk *pclk;
	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->pclk = clk_get(&pdev->dev, "apb_pclk");
	if (IS_ERR(keypad->pclk)) {
		dev_err(&pdev->dev, "failed to get pclk\n");
		error = PTR_ERR(keypad->pclk);
		goto err_iounmap;
	}

	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_pclk;
	}

	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->pclk);
	if (error) {
		dev_err(&pdev->dev, "Failed to prepare/enable pclk\n");
		goto err_clk;
	}

	error = clk_prepare_enable(keypad->clk);
	if (error) {
		dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
		goto err_pclk_disable;
	}


	/* 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_pclk_disable:
	clk_disable_unprepare(keypad->pclk);
err_clk:
	clk_put(keypad->clk);
err_pclk:
	clk_put(keypad->pclk);
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	69	struct clk *clk;
d852f959	70	struct clk *pclk;
1158f0f1 SI	71	spinlock_t ske_keypad_lock;
	72	};
	73
	74	static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
	75	u8 mask, u8 data)
	76	{
	77	u32 ret;
	78
	79	spin_lock(&keypad->ske_keypad_lock);
	80
	81	ret = readl(keypad->reg_base + addr);
	82	ret &= ~mask;
	83	ret \|= data;
	84	writel(ret, keypad->reg_base + addr);
	85
	86	spin_unlock(&keypad->ske_keypad_lock);
	87	}
	88
	89	/*
	90	* ske_keypad_chip_init: init keypad controller configuration
	91	*
	92	* Enable Multi key press detection, auto scan mode
	93	*/
db3dbd09	94	static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
1158f0f1 SI	95	{
1158f0f1 SI	96	u32 value;
84b63ad8	97	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	98
	99	/* check SKE_RIS to be 0 */
	100	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
	101	cpu_relax();
	102
	103	if (!timeout)
	104	return -EINVAL;
	105
	106	/*
	107	* set debounce value
	108	* keypad dbounce is configured in DBCR[15:8]
	109	* dbounce value in steps of 32/32.768 ms
	110	*/
	111	spin_lock(&keypad->ske_keypad_lock);
	112	value = readl(keypad->reg_base + SKE_DBCR);
	113	value = value & 0xff;
	114	value \|= ((keypad->board->debounce_ms * 32000)/32768) << 8;
	115	writel(value, keypad->reg_base + SKE_DBCR);
	116	spin_unlock(&keypad->ske_keypad_lock);
	117
	118	/* enable multi key detection */
	119	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
	120
	121	/*
	122	* set up the number of columns
	123	* KPCN[5:3] defines no. of keypad columns to be auto scanned
	124	*/
	125	value = (keypad->board->kcol - 1) << 3;
	126	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
	127
	128	/* clear keypad interrupt for auto(and pending SW) scans */
	129	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA \| SKE_KPICS);
	130
	131	/* un-mask keypad interrupts */
	132	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	133
	134	/* enable automatic scan */
	135	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
	136
	137	return 0;
	138	}
	139
af77c88b	140	static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
1158f0f1	141	{
af77c88b	142	int row = 0, code, pos;
1158f0f1	143	struct input_dev *input = keypad->input;
af77c88b NKG	144	u32 ske_ris;
	145	int key_pressed;
	146	int num_of_rows;
	147
	148	/* find out the row */
	149	num_of_rows = hweight8(status);
	150	do {
	151	pos = __ffs(status);
	152	row = pos;
	153	status &= ~(1 << pos);
	154
	155	code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
	156	ske_ris = readl(keypad->reg_base + SKE_RIS);
	157	key_pressed = ske_ris & SKE_KPRISA;
	158
	159	input_event(input, EV_MSC, MSC_SCAN, code);
	160	input_report_key(input, keypad->keymap[code], key_pressed);
	161	input_sync(input);
	162	num_of_rows--;
	163	} while (num_of_rows);
	164	}
	165
	166	static void ske_keypad_read_data(struct ske_keypad *keypad)
	167	{
	168	u8 status;
	169	int col = 0;
	170	int ske_asr, i;
1158f0f1 SI	171
	172	/*
	173	* Read the auto scan registers
	174	*
	175	* Each SKE_ASRx (x=0 to x=3) contains two row values.
	176	* lower byte contains row value for column 2*x,
	177	* upper byte contains row value for column 2*x + 1
	178	*/
	179	for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
	180	ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
	181	if (!ske_asr)
	182	continue;
	183
af77c88b NKG	184	/* now that ASRx is zero, find out the coloumn x and row y */
	185	status = ske_asr & 0xff;
	186	if (status) {
1158f0f1	187	col = i * 2;
af77c88b NKG	188	ske_keypad_report(keypad, status, col);
	189	}
	190	status = (ske_asr & 0xff00) >> 8;
	191	if (status) {
1158f0f1	192	col = (i * 2) + 1;
af77c88b	193	ske_keypad_report(keypad, status, col);
1158f0f1	194	}
1158f0f1 SI	195	}
	196	}
	197
	198	static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
	199	{
	200	struct ske_keypad *keypad = dev_id;
84b63ad8	201	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	202
	203	/* disable auto scan interrupt; mask the interrupt generated */
	204	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	205	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
	206
84b63ad8	207	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
af77c88b	208	cpu_relax();
1158f0f1	209
af77c88b NKG	210	/* SKEx registers are stable and can be read */
af77c88b NKG	211	ske_keypad_read_data(keypad);
1158f0f1	212
84b63ad8 NKG	213	/* wait until raw interrupt is clear */
	214	while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
	215	msleep(KEY_PRESSED_DELAY);
	216
1158f0f1 SI	217	/* enable auto scan interrupts */
	218	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	219
	220	return IRQ_HANDLED;
	221	}
	222
db3dbd09	223	static int __init ske_keypad_probe(struct platform_device *pdev)
1158f0f1 SI	224	{
	225	const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
	226	struct ske_keypad *keypad;
	227	struct input_dev *input;
	228	struct resource *res;
	229	int irq;
	230	int error;
	231
	232	if (!plat) {
	233	dev_err(&pdev->dev, "invalid keypad platform data\n");
	234	return -EINVAL;
	235	}
	236
	237	irq = platform_get_irq(pdev, 0);
	238	if (irq < 0) {
	239	dev_err(&pdev->dev, "failed to get keypad irq\n");
	240	return -EINVAL;
	241	}
	242
	243	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	244	if (!res) {
	245	dev_err(&pdev->dev, "missing platform resources\n");
	246	return -EINVAL;
	247	}
	248
	249	keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
	250	input = input_allocate_device();
	251	if (!keypad \|\| !input) {
	252	dev_err(&pdev->dev, "failed to allocate keypad memory\n");
	253	error = -ENOMEM;
	254	goto err_free_mem;
	255	}
	256
	257	keypad->irq = irq;
	258	keypad->board = plat;
	259	keypad->input = input;
	260	spin_lock_init(&keypad->ske_keypad_lock);
	261
	262	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	263	dev_err(&pdev->dev, "failed to request I/O memory\n");
	264	error = -EBUSY;
	265	goto err_free_mem;
	266	}
	267
	268	keypad->reg_base = ioremap(res->start, resource_size(res));
	269	if (!keypad->reg_base) {
	270	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	271	error = -ENXIO;
	272	goto err_free_mem_region;
	273	}
	274
d852f959 UH	275	keypad->pclk = clk_get(&pdev->dev, "apb_pclk");
	276	if (IS_ERR(keypad->pclk)) {
	277	dev_err(&pdev->dev, "failed to get pclk\n");
	278	error = PTR_ERR(keypad->pclk);
	279	goto err_iounmap;
	280	}
	281
1158f0f1 SI	282	keypad->clk = clk_get(&pdev->dev, NULL);
	283	if (IS_ERR(keypad->clk)) {
	284	dev_err(&pdev->dev, "failed to get clk\n");
	285	error = PTR_ERR(keypad->clk);
d852f959	286	goto err_pclk;
1158f0f1 SI	287	}
	288
	289	input->id.bustype = BUS_HOST;
	290	input->name = "ux500-ske-keypad";
	291	input->dev.parent = &pdev->dev;
	292
1932811f DT	293	error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
	294	SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
	295	keypad->keymap, input);
	296	if (error) {
	297	dev_err(&pdev->dev, "Failed to build keymap\n");
4e99aab7	298	goto err_clk;
1932811f	299	}
1158f0f1 SI	300
1158f0f1 SI	301	input_set_capability(input, EV_MSC, MSC_SCAN);
1158f0f1 SI	302	if (!plat->no_autorepeat)
	303	__set_bit(EV_REP, input->evbit);
	304
d852f959 UH	305	error = clk_prepare_enable(keypad->pclk);
	306	if (error) {
	307	dev_err(&pdev->dev, "Failed to prepare/enable pclk\n");
	308	goto err_clk;
	309	}
	310
4e99aab7 UH	311	error = clk_prepare_enable(keypad->clk);
	312	if (error) {
	313	dev_err(&pdev->dev, "Failed to prepare/enable clk\n");
d852f959	314	goto err_pclk_disable;
4e99aab7 UH	315	}
4e99aab7 UH	316
1158f0f1 SI	317
	318	/* go through board initialization helpers */
	319	if (keypad->board->init)
	320	keypad->board->init();
	321
	322	error = ske_keypad_chip_init(keypad);
	323	if (error) {
	324	dev_err(&pdev->dev, "unable to init keypad hardware\n");
	325	goto err_clk_disable;
	326	}
	327
	328	error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
	329	IRQF_ONESHOT, "ske-keypad", keypad);
	330	if (error) {
	331	dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
	332	goto err_clk_disable;
	333	}
	334
	335	error = input_register_device(input);
	336	if (error) {
	337	dev_err(&pdev->dev,
	338	"unable to register input device: %d\n", error);
	339	goto err_free_irq;
	340	}
	341
	342	if (plat->wakeup_enable)
	343	device_init_wakeup(&pdev->dev, true);
	344
	345	platform_set_drvdata(pdev, keypad);
	346
	347	return 0;
	348
	349	err_free_irq:
	350	free_irq(keypad->irq, keypad);
	351	err_clk_disable:
4e99aab7	352	clk_disable_unprepare(keypad->clk);
d852f959 UH	353	err_pclk_disable:
d852f959 UH	354	clk_disable_unprepare(keypad->pclk);
4e99aab7	355	err_clk:
1158f0f1	356	clk_put(keypad->clk);
d852f959 UH	357	err_pclk:
d852f959 UH	358	clk_put(keypad->pclk);
1158f0f1 SI	359	err_iounmap:
	360	iounmap(keypad->reg_base);
	361	err_free_mem_region:
	362	release_mem_region(res->start, resource_size(res));
	363	err_free_mem:
	364	input_free_device(input);
	365	kfree(keypad);
	366	return error;
	367	}
	368
	369	static int __devexit ske_keypad_remove(struct platform_device *pdev)
	370	{
	371	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	372	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	373
	374	free_irq(keypad->irq, keypad);
	375
	376	input_unregister_device(keypad->input);
	377
4e99aab7	378	clk_disable_unprepare(keypad->clk);
1158f0f1 SI	379	clk_put(keypad->clk);
	380
	381	if (keypad->board->exit)
	382	keypad->board->exit();
	383
	384	iounmap(keypad->reg_base);
	385	release_mem_region(res->start, resource_size(res));
	386	kfree(keypad);
	387
	388	return 0;
	389	}
	390
89f0f170	391	#ifdef CONFIG_PM_SLEEP
1158f0f1 SI	392	static int ske_keypad_suspend(struct device *dev)
	393	{
	394	struct platform_device *pdev = to_platform_device(dev);
	395	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	396	int irq = platform_get_irq(pdev, 0);
	397
	398	if (device_may_wakeup(dev))
	399	enable_irq_wake(irq);
	400	else
	401	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	402
	403	return 0;
	404	}
	405
	406	static int ske_keypad_resume(struct device *dev)
	407	{
	408	struct platform_device *pdev = to_platform_device(dev);
	409	struct ske_keypad *keypad = platform_get_drvdata(pdev);
	410	int irq = platform_get_irq(pdev, 0);
	411
	412	if (device_may_wakeup(dev))
	413	disable_irq_wake(irq);
	414	else
	415	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	416
	417	return 0;
	418	}
1158f0f1 SI	419	#endif
1158f0f1 SI	420
89f0f170 DT	421	static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
	422	ske_keypad_suspend, ske_keypad_resume);
	423
aeec0517	424	static struct platform_driver ske_keypad_driver = {
1158f0f1 SI	425	.driver = {
	426	.name = "nmk-ske-keypad",
	427	.owner = THIS_MODULE,
1158f0f1	428	.pm = &ske_keypad_dev_pm_ops,
1158f0f1	429	},
1158f0f1 SI	430	.remove = __devexit_p(ske_keypad_remove),
1158f0f1 SI	431	};
d3d25808 DT	432
	433	static int __init ske_keypad_init(void)
	434	{
	435	return platform_driver_probe(&ske_keypad_driver, ske_keypad_probe);
	436	}
	437	module_init(ske_keypad_init);
	438
	439	static void __exit ske_keypad_exit(void)
	440	{
	441	platform_driver_unregister(&ske_keypad_driver);
	442	}
	443	module_exit(ske_keypad_exit);
1158f0f1 SI	444
	445	MODULE_LICENSE("GPL v2");
	446	MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
	447	MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
	448	MODULE_ALIAS("platform:nomadik-ske-keypad");