[linux-2.6-block.git] / drivers / input / keyboard / nomadik-ske-keypad.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
 *
 * 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 registers base address
 * @input:	pointer to input device object
 * @board:	keypad platform device
 * @keymap:	matrix scan code table for keycodes
 * @clk:	clock structure pointer
 * @pclk:	clock structure pointer
 * @ske_keypad_lock: spinlock protecting the keypad read/writes
 */
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 == -1)
		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 =
			dev_get_platdata(&pdev->dev);
	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)
		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 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",
		.pm = &ske_keypad_dev_pm_ops,
	},
	.remove = ske_keypad_remove,
};

module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe);

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
af873fce	1	// SPDX-License-Identifier: GPL-2.0-only
1158f0f1 SI	2	/*
	3	* Copyright (C) ST-Ericsson SA 2010
	4	*
	5	* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
	6	* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
	7	*
1158f0f1 SI	8	* Keypad controller driver for the SKE (Scroll Key Encoder) module used in
	9	* the Nomadik 8815 and Ux500 platforms.
	10	*/
	11
	12	#include <linux/platform_device.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/io.h>
	16	#include <linux/delay.h>
	17	#include <linux/input.h>
	18	#include <linux/slab.h>
	19	#include <linux/clk.h>
d2d8442d	20	#include <linux/module.h>
1158f0f1	21
db298da2	22	#include <linux/platform_data/keypad-nomadik-ske.h>
1158f0f1 SI	23
	24	/* SKE_CR bits */
	25	#define SKE_KPMLT (0x1 << 6)
	26	#define SKE_KPCN (0x7 << 3)
	27	#define SKE_KPASEN (0x1 << 2)
	28	#define SKE_KPASON (0x1 << 7)
	29
	30	/* SKE_IMSC bits */
	31	#define SKE_KPIMA (0x1 << 2)
	32
	33	/* SKE_ICR bits */
	34	#define SKE_KPICS (0x1 << 3)
	35	#define SKE_KPICA (0x1 << 2)
	36
	37	/* SKE_RIS bits */
	38	#define SKE_KPRISA (0x1 << 2)
	39
	40	#define SKE_KEYPAD_ROW_SHIFT 3
1932811f DT	41	#define SKE_KPD_NUM_ROWS 8
1932811f DT	42	#define SKE_KPD_NUM_COLS 8
1158f0f1 SI	43
	44	/* keypad auto scan registers */
	45	#define SKE_ASR0 0x20
	46	#define SKE_ASR1 0x24
	47	#define SKE_ASR2 0x28
	48	#define SKE_ASR3 0x2C
	49
	50	#define SKE_NUM_ASRX_REGISTERS (4)
84b63ad8	51	#define KEY_PRESSED_DELAY 10
1158f0f1 SI	52
	53	/**
	54	* struct ske_keypad - data structure used by keypad driver
	55	* @irq: irq no
2e9776e0	56	* @reg_base: ske registers base address
1158f0f1 SI	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
5b27585a LJ	61	* @pclk: clock structure pointer
5b27585a LJ	62	* @ske_keypad_lock: spinlock protecting the keypad read/writes
1158f0f1 SI	63	*/
	64	struct ske_keypad {
	65	int irq;
	66	void __iomem *reg_base;
	67	struct input_dev *input;
	68	const struct ske_keypad_platform_data *board;
1932811f	69	unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
1158f0f1	70	struct clk *clk;
d852f959	71	struct clk *pclk;
1158f0f1 SI	72	spinlock_t ske_keypad_lock;
	73	};
	74
	75	static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
	76	u8 mask, u8 data)
	77	{
	78	u32 ret;
	79
	80	spin_lock(&keypad->ske_keypad_lock);
	81
	82	ret = readl(keypad->reg_base + addr);
	83	ret &= ~mask;
	84	ret \|= data;
	85	writel(ret, keypad->reg_base + addr);
	86
	87	spin_unlock(&keypad->ske_keypad_lock);
	88	}
	89
	90	/*
	91	* ske_keypad_chip_init: init keypad controller configuration
	92	*
	93	* Enable Multi key press detection, auto scan mode
	94	*/
db3dbd09	95	static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
1158f0f1 SI	96	{
1158f0f1 SI	97	u32 value;
84b63ad8	98	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	99
	100	/* check SKE_RIS to be 0 */
	101	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
	102	cpu_relax();
	103
4d8f727b	104	if (timeout == -1)
1158f0f1 SI	105	return -EINVAL;
	106
	107	/*
	108	* set debounce value
	109	* keypad dbounce is configured in DBCR[15:8]
	110	* dbounce value in steps of 32/32.768 ms
	111	*/
	112	spin_lock(&keypad->ske_keypad_lock);
	113	value = readl(keypad->reg_base + SKE_DBCR);
	114	value = value & 0xff;
	115	value \|= ((keypad->board->debounce_ms * 32000)/32768) << 8;
	116	writel(value, keypad->reg_base + SKE_DBCR);
	117	spin_unlock(&keypad->ske_keypad_lock);
	118
	119	/* enable multi key detection */
	120	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
	121
	122	/*
	123	* set up the number of columns
	124	* KPCN[5:3] defines no. of keypad columns to be auto scanned
	125	*/
	126	value = (keypad->board->kcol - 1) << 3;
	127	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
	128
	129	/* clear keypad interrupt for auto(and pending SW) scans */
	130	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA \| SKE_KPICS);
	131
	132	/* un-mask keypad interrupts */
	133	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	134
	135	/* enable automatic scan */
	136	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
	137
	138	return 0;
	139	}
	140
af77c88b	141	static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
1158f0f1	142	{
af77c88b	143	int row = 0, code, pos;
1158f0f1	144	struct input_dev *input = keypad->input;
af77c88b NKG	145	u32 ske_ris;
	146	int key_pressed;
	147	int num_of_rows;
	148
	149	/* find out the row */
	150	num_of_rows = hweight8(status);
	151	do {
	152	pos = __ffs(status);
	153	row = pos;
	154	status &= ~(1 << pos);
	155
	156	code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
	157	ske_ris = readl(keypad->reg_base + SKE_RIS);
	158	key_pressed = ske_ris & SKE_KPRISA;
	159
	160	input_event(input, EV_MSC, MSC_SCAN, code);
	161	input_report_key(input, keypad->keymap[code], key_pressed);
	162	input_sync(input);
	163	num_of_rows--;
	164	} while (num_of_rows);
	165	}
	166
	167	static void ske_keypad_read_data(struct ske_keypad *keypad)
	168	{
	169	u8 status;
	170	int col = 0;
	171	int ske_asr, i;
1158f0f1 SI	172
	173	/*
	174	* Read the auto scan registers
	175	*
	176	* Each SKE_ASRx (x=0 to x=3) contains two row values.
	177	* lower byte contains row value for column 2*x,
	178	* upper byte contains row value for column 2*x + 1
	179	*/
	180	for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
	181	ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
	182	if (!ske_asr)
	183	continue;
	184
af77c88b NKG	185	/* now that ASRx is zero, find out the coloumn x and row y */
	186	status = ske_asr & 0xff;
	187	if (status) {
1158f0f1	188	col = i * 2;
af77c88b NKG	189	ske_keypad_report(keypad, status, col);
	190	}
	191	status = (ske_asr & 0xff00) >> 8;
	192	if (status) {
1158f0f1	193	col = (i * 2) + 1;
af77c88b	194	ske_keypad_report(keypad, status, col);
1158f0f1	195	}
1158f0f1 SI	196	}
	197	}
	198
	199	static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
	200	{
	201	struct ske_keypad *keypad = dev_id;
84b63ad8	202	int timeout = keypad->board->debounce_ms;
1158f0f1 SI	203
	204	/* disable auto scan interrupt; mask the interrupt generated */
	205	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
	206	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
	207
84b63ad8	208	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
af77c88b	209	cpu_relax();
1158f0f1	210
af77c88b NKG	211	/* SKEx registers are stable and can be read */
af77c88b NKG	212	ske_keypad_read_data(keypad);
1158f0f1	213
84b63ad8 NKG	214	/* wait until raw interrupt is clear */
	215	while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
	216	msleep(KEY_PRESSED_DELAY);
	217
1158f0f1 SI	218	/* enable auto scan interrupts */
	219	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
	220
	221	return IRQ_HANDLED;
	222	}
	223
db3dbd09	224	static int __init ske_keypad_probe(struct platform_device *pdev)
1158f0f1	225	{
c838cb3d JH	226	const struct ske_keypad_platform_data *plat =
c838cb3d JH	227	dev_get_platdata(&pdev->dev);
1158f0f1 SI	228	struct ske_keypad *keypad;
	229	struct input_dev *input;
	230	struct resource *res;
	231	int irq;
	232	int error;
	233
	234	if (!plat) {
	235	dev_err(&pdev->dev, "invalid keypad platform data\n");
	236	return -EINVAL;
	237	}
	238
	239	irq = platform_get_irq(pdev, 0);
0bec8b7e	240	if (irq < 0)
1158f0f1	241	return -EINVAL;
1158f0f1 SI	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
e2619cf7	369	static int ske_keypad_remove(struct platform_device *pdev)
1158f0f1 SI	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 = {
1158f0f1 SI	426	.name = "nmk-ske-keypad",
1158f0f1	427	.pm = &ske_keypad_dev_pm_ops,
1158f0f1	428	},
1cb0aa88	429	.remove = ske_keypad_remove,
1158f0f1	430	};
d3d25808	431
0442ce1c	432	module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe);
1158f0f1 SI	433
	434	MODULE_LICENSE("GPL v2");
	435	MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
	436	MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
	437	MODULE_ALIAS("platform:nomadik-ske-keypad");