[net-next-2.6.git] / drivers / input / keyboard / samsung-keypad.c

/*
 * Samsung keypad driver
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 * Author: Donghwa Lee <dh09.lee@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <plat/keypad.h>

#define SAMSUNG_KEYIFCON			0x00
#define SAMSUNG_KEYIFSTSCLR			0x04
#define SAMSUNG_KEYIFCOL			0x08
#define SAMSUNG_KEYIFROW			0x0c
#define SAMSUNG_KEYIFFC				0x10

/* SAMSUNG_KEYIFCON */
#define SAMSUNG_KEYIFCON_INT_F_EN		(1 << 0)
#define SAMSUNG_KEYIFCON_INT_R_EN		(1 << 1)
#define SAMSUNG_KEYIFCON_DF_EN			(1 << 2)
#define SAMSUNG_KEYIFCON_FC_EN			(1 << 3)
#define SAMSUNG_KEYIFCON_WAKEUPEN		(1 << 4)

/* SAMSUNG_KEYIFSTSCLR */
#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK		(0xff << 0)
#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK		(0xff << 8)
#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET	8
#define S5PV210_KEYIFSTSCLR_P_INT_MASK		(0x3fff << 0)
#define S5PV210_KEYIFSTSCLR_R_INT_MASK		(0x3fff << 16)
#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET	16

/* SAMSUNG_KEYIFCOL */
#define SAMSUNG_KEYIFCOL_MASK			(0xff << 0)
#define S5PV210_KEYIFCOLEN_MASK			(0xff << 8)

/* SAMSUNG_KEYIFROW */
#define SAMSUNG_KEYIFROW_MASK			(0xff << 0)
#define S5PV210_KEYIFROW_MASK			(0x3fff << 0)

/* SAMSUNG_KEYIFFC */
#define SAMSUNG_KEYIFFC_MASK			(0x3ff << 0)

enum samsung_keypad_type {
	KEYPAD_TYPE_SAMSUNG,
	KEYPAD_TYPE_S5PV210,
};

struct samsung_keypad {
	struct input_dev *input_dev;
	struct clk *clk;
	void __iomem *base;
	wait_queue_head_t wait;
	bool stopped;
	int irq;
	unsigned int row_shift;
	unsigned int rows;
	unsigned int cols;
	unsigned int row_state[SAMSUNG_MAX_COLS];
	unsigned short keycodes[];
};

static int samsung_keypad_is_s5pv210(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	enum samsung_keypad_type type =
		platform_get_device_id(pdev)->driver_data;

	return type == KEYPAD_TYPE_S5PV210;
}

static void samsung_keypad_scan(struct samsung_keypad *keypad,
				unsigned int *row_state)
{
	struct device *dev = keypad->input_dev->dev.parent;
	unsigned int col;
	unsigned int val;

	for (col = 0; col < keypad->cols; col++) {
		if (samsung_keypad_is_s5pv210(dev)) {
			val = S5PV210_KEYIFCOLEN_MASK;
			val &= ~(1 << col) << 8;
		} else {
			val = SAMSUNG_KEYIFCOL_MASK;
			val &= ~(1 << col);
		}

		writel(val, keypad->base + SAMSUNG_KEYIFCOL);
		mdelay(1);

		val = readl(keypad->base + SAMSUNG_KEYIFROW);
		row_state[col] = ~val & ((1 << keypad->rows) - 1);
	}

	/* KEYIFCOL reg clear */
	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
}

static bool samsung_keypad_report(struct samsung_keypad *keypad,
				  unsigned int *row_state)
{
	struct input_dev *input_dev = keypad->input_dev;
	unsigned int changed;
	unsigned int pressed;
	unsigned int key_down = 0;
	unsigned int val;
	unsigned int col, row;

	for (col = 0; col < keypad->cols; col++) {
		changed = row_state[col] ^ keypad->row_state[col];
		key_down |= row_state[col];
		if (!changed)
			continue;

		for (row = 0; row < keypad->rows; row++) {
			if (!(changed & (1 << row)))
				continue;

			pressed = row_state[col] & (1 << row);

			dev_dbg(&keypad->input_dev->dev,
				"key %s, row: %d, col: %d\n",
				pressed ? "pressed" : "released", row, col);

			val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);

			input_event(input_dev, EV_MSC, MSC_SCAN, val);
			input_report_key(input_dev,
					keypad->keycodes[val], pressed);
		}
		input_sync(keypad->input_dev);
	}

	memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));

	return key_down;
}

static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
{
	struct samsung_keypad *keypad = dev_id;
	unsigned int row_state[SAMSUNG_MAX_COLS];
	unsigned int val;
	bool key_down;

	do {
		val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
		/* Clear interrupt. */
		writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);

		samsung_keypad_scan(keypad, row_state);

		key_down = samsung_keypad_report(keypad, row_state);
		if (key_down)
			wait_event_timeout(keypad->wait, keypad->stopped,
					   msecs_to_jiffies(50));

	} while (key_down && !keypad->stopped);

	return IRQ_HANDLED;
}

static void samsung_keypad_start(struct samsung_keypad *keypad)
{
	unsigned int val;

	/* Tell IRQ thread that it may poll the device. */
	keypad->stopped = false;

	clk_enable(keypad->clk);

	/* Enable interrupt bits. */
	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
	writel(val, keypad->base + SAMSUNG_KEYIFCON);

	/* KEYIFCOL reg clear. */
	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
}

static void samsung_keypad_stop(struct samsung_keypad *keypad)
{
	unsigned int val;

	/* Signal IRQ thread to stop polling and disable the handler. */
	keypad->stopped = true;
	wake_up(&keypad->wait);
	disable_irq(keypad->irq);

	/* Clear interrupt. */
	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);

	/* Disable interrupt bits. */
	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
	writel(val, keypad->base + SAMSUNG_KEYIFCON);

	clk_disable(keypad->clk);

	/*
	 * Now that chip should not generate interrupts we can safely
	 * re-enable the handler.
	 */
	enable_irq(keypad->irq);
}

static int samsung_keypad_open(struct input_dev *input_dev)
{
	struct samsung_keypad *keypad = input_get_drvdata(input_dev);

	samsung_keypad_start(keypad);

	return 0;
}

static void samsung_keypad_close(struct input_dev *input_dev)
{
	struct samsung_keypad *keypad = input_get_drvdata(input_dev);

	samsung_keypad_stop(keypad);
}

static int __devinit samsung_keypad_probe(struct platform_device *pdev)
{
	const struct samsung_keypad_platdata *pdata;
	const struct matrix_keymap_data *keymap_data;
	struct samsung_keypad *keypad;
	struct resource *res;
	struct input_dev *input_dev;
	unsigned int row_shift;
	unsigned int keymap_size;
	int error;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data defined\n");
		return -EINVAL;
	}

	keymap_data = pdata->keymap_data;
	if (!keymap_data) {
		dev_err(&pdev->dev, "no keymap data defined\n");
		return -EINVAL;
	}

	if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
		return -EINVAL;

	if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
		return -EINVAL;

	/* initialize the gpio */
	if (pdata->cfg_gpio)
		pdata->cfg_gpio(pdata->rows, pdata->cols);

	row_shift = get_count_order(pdata->cols);
	keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);

	keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!keypad || !input_dev) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		error = -ENODEV;
		goto err_free_mem;
	}

	keypad->base = ioremap(res->start, resource_size(res));
	if (!keypad->base) {
		error = -EBUSY;
		goto err_free_mem;
	}

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

	keypad->input_dev = input_dev;
	keypad->row_shift = row_shift;
	keypad->rows = pdata->rows;
	keypad->cols = pdata->cols;
	init_waitqueue_head(&keypad->wait);

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->dev.parent = &pdev->dev;
	input_set_drvdata(input_dev, keypad);

	input_dev->open = samsung_keypad_open;
	input_dev->close = samsung_keypad_close;

	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	if (!pdata->no_autorepeat)
		input_dev->evbit[0] |= BIT_MASK(EV_REP);

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

	input_dev->keycode = keypad->keycodes;
	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
	input_dev->keycodemax = pdata->rows << row_shift;

	matrix_keypad_build_keymap(keymap_data, row_shift,
			input_dev->keycode, input_dev->keybit);

	keypad->irq = platform_get_irq(pdev, 0);
	if (keypad->irq < 0) {
		error = keypad->irq;
		goto err_put_clk;
	}

	error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
			IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
	if (error) {
		dev_err(&pdev->dev, "failed to register keypad interrupt\n");
		goto err_put_clk;
	}

	error = input_register_device(keypad->input_dev);
	if (error)
		goto err_free_irq;

	device_init_wakeup(&pdev->dev, pdata->wakeup);
	platform_set_drvdata(pdev, keypad);
	return 0;

err_free_irq:
	free_irq(keypad->irq, keypad);
err_put_clk:
	clk_put(keypad->clk);
err_unmap_base:
	iounmap(keypad->base);
err_free_mem:
	input_free_device(input_dev);
	kfree(keypad);

	return error;
}

static int __devexit samsung_keypad_remove(struct platform_device *pdev)
{
	struct samsung_keypad *keypad = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
	platform_set_drvdata(pdev, NULL);

	input_unregister_device(keypad->input_dev);

	/*
	 * It is safe to free IRQ after unregistering device because
	 * samsung_keypad_close will shut off interrupts.
	 */
	free_irq(keypad->irq, keypad);

	clk_put(keypad->clk);

	iounmap(keypad->base);
	kfree(keypad);

	return 0;
}

#ifdef CONFIG_PM
static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
					 bool enable)
{
	struct device *dev = keypad->input_dev->dev.parent;
	unsigned int val;

	clk_enable(keypad->clk);

	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	if (enable) {
		val |= SAMSUNG_KEYIFCON_WAKEUPEN;
		if (device_may_wakeup(dev))
			enable_irq_wake(keypad->irq);
	} else {
		val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
		if (device_may_wakeup(dev))
			disable_irq_wake(keypad->irq);
	}
	writel(val, keypad->base + SAMSUNG_KEYIFCON);

	clk_disable(keypad->clk);
}

static int samsung_keypad_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
		samsung_keypad_stop(keypad);

	samsung_keypad_toggle_wakeup(keypad, true);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static int samsung_keypad_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	samsung_keypad_toggle_wakeup(keypad, false);

	if (input_dev->users)
		samsung_keypad_start(keypad);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static const struct dev_pm_ops samsung_keypad_pm_ops = {
	.suspend	= samsung_keypad_suspend,
	.resume		= samsung_keypad_resume,
};
#endif

static struct platform_device_id samsung_keypad_driver_ids[] = {
	{
		.name		= "samsung-keypad",
		.driver_data	= KEYPAD_TYPE_SAMSUNG,
	}, {
		.name		= "s5pv210-keypad",
		.driver_data	= KEYPAD_TYPE_S5PV210,
	},
	{ },
};
MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);

static struct platform_driver samsung_keypad_driver = {
	.probe		= samsung_keypad_probe,
	.remove		= __devexit_p(samsung_keypad_remove),
	.driver		= {
		.name	= "samsung-keypad",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &samsung_keypad_pm_ops,
#endif
	},
	.id_table	= samsung_keypad_driver_ids,
};

static int __init samsung_keypad_init(void)
{
	return platform_driver_register(&samsung_keypad_driver);
}
module_init(samsung_keypad_init);

static void __exit samsung_keypad_exit(void)
{
	platform_driver_unregister(&samsung_keypad_driver);
}
module_exit(samsung_keypad_exit);

MODULE_DESCRIPTION("Samsung keypad driver");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-keypad");
Commit	Line	Data
0fffed27 JS	1	/*
	2	* Samsung keypad driver
	3	*
	4	* Copyright (C) 2010 Samsung Electronics Co.Ltd
	5	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	6	* Author: Donghwa Lee <dh09.lee@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/clk.h>
	15	#include <linux/delay.h>
	16	#include <linux/err.h>
	17	#include <linux/init.h>
	18	#include <linux/input.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/io.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/slab.h>
	24	#include <linux/sched.h>
	25	#include <plat/keypad.h>
	26
	27	#define SAMSUNG_KEYIFCON 0x00
	28	#define SAMSUNG_KEYIFSTSCLR 0x04
	29	#define SAMSUNG_KEYIFCOL 0x08
	30	#define SAMSUNG_KEYIFROW 0x0c
	31	#define SAMSUNG_KEYIFFC 0x10
	32
	33	/* SAMSUNG_KEYIFCON */
	34	#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
	35	#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
	36	#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
	37	#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
	38	#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
	39
	40	/* SAMSUNG_KEYIFSTSCLR */
	41	#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
	42	#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
	43	#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
	44	#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
	45	#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
	46	#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
	47
	48	/* SAMSUNG_KEYIFCOL */
	49	#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
	50	#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
	51
	52	/* SAMSUNG_KEYIFROW */
	53	#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
	54	#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
	55
	56	/* SAMSUNG_KEYIFFC */
	57	#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
	58
	59	enum samsung_keypad_type {
	60	KEYPAD_TYPE_SAMSUNG,
	61	KEYPAD_TYPE_S5PV210,
	62	};
	63
	64	struct samsung_keypad {
65	struct input_dev *input_dev;
66	struct clk *clk;
67	void __iomem *base;
68	wait_queue_head_t wait;
69	bool stopped;
70	int irq;
71	unsigned int row_shift;
72	unsigned int rows;
73	unsigned int cols;
74	unsigned int row_state[SAMSUNG_MAX_COLS];
75	unsigned short keycodes[];
76	};
77
78	static int samsung_keypad_is_s5pv210(struct device *dev)
79	{
80	struct platform_device *pdev = to_platform_device(dev);
81	enum samsung_keypad_type type =
82	platform_get_device_id(pdev)->driver_data;
83
84	return type == KEYPAD_TYPE_S5PV210;
85	}
86
87	static void samsung_keypad_scan(struct samsung_keypad *keypad,
88	unsigned int *row_state)
89	{
90	struct device *dev = keypad->input_dev->dev.parent;
91	unsigned int col;
92	unsigned int val;
93
94	for (col = 0; col < keypad->cols; col++) {
95	if (samsung_keypad_is_s5pv210(dev)) {
96	val = S5PV210_KEYIFCOLEN_MASK;
97	val &= ~(1 << col) << 8;
98	} else {
99	val = SAMSUNG_KEYIFCOL_MASK;
100	val &= ~(1 << col);
101	}
102
103	writel(val, keypad->base + SAMSUNG_KEYIFCOL);
104	mdelay(1);
105
106	val = readl(keypad->base + SAMSUNG_KEYIFROW);
107	row_state[col] = ~val & ((1 << keypad->rows) - 1);
108	}
109
110	/* KEYIFCOL reg clear */
111	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
112	}
113
114	static bool samsung_keypad_report(struct samsung_keypad *keypad,
115	unsigned int *row_state)
116	{
117	struct input_dev *input_dev = keypad->input_dev;
118	unsigned int changed;
119	unsigned int pressed;
120	unsigned int key_down = 0;
121	unsigned int val;
122	unsigned int col, row;
123
124	for (col = 0; col < keypad->cols; col++) {
125	changed = row_state[col] ^ keypad->row_state[col];
126	key_down \|= row_state[col];
127	if (!changed)
128	continue;
129
130	for (row = 0; row < keypad->rows; row++) {
131	if (!(changed & (1 << row)))
132	continue;
133
134	pressed = row_state[col] & (1 << row);
135
136	dev_dbg(&keypad->input_dev->dev,
137	"key %s, row: %d, col: %d\n",
138	pressed ? "pressed" : "released", row, col);
139
140	val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
141
142	input_event(input_dev, EV_MSC, MSC_SCAN, val);
143	input_report_key(input_dev,
144	keypad->keycodes[val], pressed);
145	}
146	input_sync(keypad->input_dev);
147	}
148
149	memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
150
151	return key_down;
152	}
153
154	static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
155	{
156	struct samsung_keypad *keypad = dev_id;
157	unsigned int row_state[SAMSUNG_MAX_COLS];
158	unsigned int val;
159	bool key_down;
160
161	do {
162	val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
163	/* Clear interrupt. */
164	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
165
166	samsung_keypad_scan(keypad, row_state);
167
168	key_down = samsung_keypad_report(keypad, row_state);
169	if (key_down)
170	wait_event_timeout(keypad->wait, keypad->stopped,
171	msecs_to_jiffies(50));
172
173	} while (key_down && !keypad->stopped);
174
175	return IRQ_HANDLED;
176	}
177
178	static void samsung_keypad_start(struct samsung_keypad *keypad)
179	{
180	unsigned int val;
181
182	/* Tell IRQ thread that it may poll the device. */
183	keypad->stopped = false;
184
185	clk_enable(keypad->clk);
186
187	/* Enable interrupt bits. */
188	val = readl(keypad->base + SAMSUNG_KEYIFCON);
189	val \|= SAMSUNG_KEYIFCON_INT_F_EN \| SAMSUNG_KEYIFCON_INT_R_EN;
190	writel(val, keypad->base + SAMSUNG_KEYIFCON);
191
192	/* KEYIFCOL reg clear. */
193	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
194	}
195
196	static void samsung_keypad_stop(struct samsung_keypad *keypad)
197	{
198	unsigned int val;
199
200	/* Signal IRQ thread to stop polling and disable the handler. */
201	keypad->stopped = true;
202	wake_up(&keypad->wait);
203	disable_irq(keypad->irq);
204
205	/* Clear interrupt. */
206	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
207
208	/* Disable interrupt bits. */
209	val = readl(keypad->base + SAMSUNG_KEYIFCON);
210	val &= ~(SAMSUNG_KEYIFCON_INT_F_EN \| SAMSUNG_KEYIFCON_INT_R_EN);
211	writel(val, keypad->base + SAMSUNG_KEYIFCON);
212
213	clk_disable(keypad->clk);
214
215	/*
216	* Now that chip should not generate interrupts we can safely
217	* re-enable the handler.
218	*/
219	enable_irq(keypad->irq);
220	}
221
222	static int samsung_keypad_open(struct input_dev *input_dev)
223	{
224	struct samsung_keypad *keypad = input_get_drvdata(input_dev);
225
226	samsung_keypad_start(keypad);
227
228	return 0;
229	}
230
231	static void samsung_keypad_close(struct input_dev *input_dev)
232	{
233	struct samsung_keypad *keypad = input_get_drvdata(input_dev);
234
235	samsung_keypad_stop(keypad);
236	}
237
238	static int __devinit samsung_keypad_probe(struct platform_device *pdev)
239	{
240	const struct samsung_keypad_platdata *pdata;
241	const struct matrix_keymap_data *keymap_data;
242	struct samsung_keypad *keypad;
243	struct resource *res;
244	struct input_dev *input_dev;
245	unsigned int row_shift;
246	unsigned int keymap_size;
247	int error;
248
249	pdata = pdev->dev.platform_data;
250	if (!pdata) {
251	dev_err(&pdev->dev, "no platform data defined\n");
252	return -EINVAL;
253	}
254
255	keymap_data = pdata->keymap_data;
256	if (!keymap_data) {
257	dev_err(&pdev->dev, "no keymap data defined\n");
258	return -EINVAL;
259	}
260
261	if (!pdata->rows \|\| pdata->rows > SAMSUNG_MAX_ROWS)
262	return -EINVAL;
263
264	if (!pdata->cols \|\| pdata->cols > SAMSUNG_MAX_COLS)
265	return -EINVAL;
266
267	/* initialize the gpio */
268	if (pdata->cfg_gpio)
269	pdata->cfg_gpio(pdata->rows, pdata->cols);
270
271	row_shift = get_count_order(pdata->cols);
272	keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
273
274	keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
275	input_dev = input_allocate_device();
276	if (!keypad \|\| !input_dev) {
277	error = -ENOMEM;
278	goto err_free_mem;
279	}
280
281	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
282	if (!res) {
283	error = -ENODEV;
284	goto err_free_mem;
285	}
286
287	keypad->base = ioremap(res->start, resource_size(res));
288	if (!keypad->base) {
289	error = -EBUSY;
290	goto err_free_mem;
291	}
292
293	keypad->clk = clk_get(&pdev->dev, "keypad");
294	if (IS_ERR(keypad->clk)) {
295	dev_err(&pdev->dev, "failed to get keypad clk\n");
296	error = PTR_ERR(keypad->clk);
297	goto err_unmap_base;
298	}
299
300	keypad->input_dev = input_dev;
301	keypad->row_shift = row_shift;
302	keypad->rows = pdata->rows;
303	keypad->cols = pdata->cols;
304	init_waitqueue_head(&keypad->wait);
305
306	input_dev->name = pdev->name;
307	input_dev->id.bustype = BUS_HOST;
308	input_dev->dev.parent = &pdev->dev;
309	input_set_drvdata(input_dev, keypad);
310
311	input_dev->open = samsung_keypad_open;
312	input_dev->close = samsung_keypad_close;
313
314	input_dev->evbit[0] = BIT_MASK(EV_KEY);
315	if (!pdata->no_autorepeat)
316	input_dev->evbit[0] \|= BIT_MASK(EV_REP);
317
318	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
319
320	input_dev->keycode = keypad->keycodes;
321	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
322	input_dev->keycodemax = pdata->rows << row_shift;
323
324	matrix_keypad_build_keymap(keymap_data, row_shift,
325	input_dev->keycode, input_dev->keybit);
326
327	keypad->irq = platform_get_irq(pdev, 0);
328	if (keypad->irq < 0) {
329	error = keypad->irq;
330	goto err_put_clk;
331	}
332
333	error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
334	IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
335	if (error) {
336	dev_err(&pdev->dev, "failed to register keypad interrupt\n");
337	goto err_put_clk;
338	}
339
340	error = input_register_device(keypad->input_dev);
341	if (error)
342	goto err_free_irq;
343
344	device_init_wakeup(&pdev->dev, pdata->wakeup);
345	platform_set_drvdata(pdev, keypad);
346	return 0;
347
348	err_free_irq:
349	free_irq(keypad->irq, keypad);
350	err_put_clk:
351	clk_put(keypad->clk);
352	err_unmap_base:
353	iounmap(keypad->base);
354	err_free_mem:
355	input_free_device(input_dev);
356	kfree(keypad);
357
358	return error;
359	}
360
361	static int __devexit samsung_keypad_remove(struct platform_device *pdev)
362	{
363	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
364
365	device_init_wakeup(&pdev->dev, 0);
366	platform_set_drvdata(pdev, NULL);
367
368	input_unregister_device(keypad->input_dev);
369
370	/*
371	* It is safe to free IRQ after unregistering device because
372	* samsung_keypad_close will shut off interrupts.
373	*/
374	free_irq(keypad->irq, keypad);
375
376	clk_put(keypad->clk);
377
378	iounmap(keypad->base);
379	kfree(keypad);
380
381	return 0;
382	}
383
384	#ifdef CONFIG_PM
385	static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
386	bool enable)
387	{
388	struct device *dev = keypad->input_dev->dev.parent;
389	unsigned int val;
390
391	clk_enable(keypad->clk);
392
393	val = readl(keypad->base + SAMSUNG_KEYIFCON);
394	if (enable) {
395	val \|= SAMSUNG_KEYIFCON_WAKEUPEN;
396	if (device_may_wakeup(dev))
397	enable_irq_wake(keypad->irq);
398	} else {
399	val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
400	if (device_may_wakeup(dev))
401	disable_irq_wake(keypad->irq);
402	}
403	writel(val, keypad->base + SAMSUNG_KEYIFCON);
404
405	clk_disable(keypad->clk);
406	}
407
408	static int samsung_keypad_suspend(struct device *dev)
409	{
410	struct platform_device *pdev = to_platform_device(dev);
411	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
412	struct input_dev *input_dev = keypad->input_dev;
413
414	mutex_lock(&input_dev->mutex);
415
416	if (input_dev->users)
417	samsung_keypad_stop(keypad);
418
419	samsung_keypad_toggle_wakeup(keypad, true);
420
421	mutex_unlock(&input_dev->mutex);
422
423	return 0;
424	}
425
426	static int samsung_keypad_resume(struct device *dev)
427	{
428	struct platform_device *pdev = to_platform_device(dev);
429	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
430	struct input_dev *input_dev = keypad->input_dev;
431
432	mutex_lock(&input_dev->mutex);
433
434	samsung_keypad_toggle_wakeup(keypad, false);
435
436	if (input_dev->users)
437	samsung_keypad_start(keypad);
438
439	mutex_unlock(&input_dev->mutex);
440
441	return 0;
442	}
443
444	static const struct dev_pm_ops samsung_keypad_pm_ops = {
445	.suspend = samsung_keypad_suspend,
446	.resume = samsung_keypad_resume,
447	};
448	#endif
449
450	static struct platform_device_id samsung_keypad_driver_ids[] = {
451	{
452	.name = "samsung-keypad",
453	.driver_data = KEYPAD_TYPE_SAMSUNG,
454	}, {
455	.name = "s5pv210-keypad",
456	.driver_data = KEYPAD_TYPE_S5PV210,
457	},
458	{ },
459	};
460	MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
461
462	static struct platform_driver samsung_keypad_driver = {
463	.probe = samsung_keypad_probe,
464	.remove = __devexit_p(samsung_keypad_remove),
465	.driver = {
466	.name = "samsung-keypad",
467	.owner = THIS_MODULE,
468	#ifdef CONFIG_PM
469	.pm = &samsung_keypad_pm_ops,
470	#endif
471	},
472	.id_table = samsung_keypad_driver_ids,
473	};
474
475	static int __init samsung_keypad_init(void)
476	{
477	return platform_driver_register(&samsung_keypad_driver);
478	}
479	module_init(samsung_keypad_init);
480
481	static void __exit samsung_keypad_exit(void)
482	{
483	platform_driver_unregister(&samsung_keypad_driver);
484	}
485	module_exit(samsung_keypad_exit);
486
487	MODULE_DESCRIPTION("Samsung keypad driver");
488	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
489	MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
490	MODULE_LICENSE("GPL");
491	MODULE_ALIAS("platform:samsung-keypad");