[mirror_ubuntu-bionic-kernel.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/pm.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/input/samsung-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 platform_device *pdev;
	struct clk *clk;
	void __iomem *base;
	wait_queue_head_t wait;
	bool stopped;
	bool wake_enabled;
	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;

	pm_runtime_get_sync(&keypad->pdev->dev);

	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);

	pm_runtime_put_sync(&keypad->pdev->dev);

	return IRQ_HANDLED;
}

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

	pm_runtime_get_sync(&keypad->pdev->dev);

	/* 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);

	pm_runtime_put_sync(&keypad->pdev->dev);
}

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

	pm_runtime_get_sync(&keypad->pdev->dev);

	/* 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);

	pm_runtime_put_sync(&keypad->pdev->dev);
}

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->pdev = pdev;
	keypad->row_shift = row_shift;
	keypad->rows = pdata->rows;
	keypad->cols = pdata->cols;
	keypad->stopped = true;
	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;
	}

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

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

	return 0;

err_free_irq:
	free_irq(keypad->irq, keypad);
	pm_runtime_disable(&pdev->dev);
	device_init_wakeup(&pdev->dev, 0);
	platform_set_drvdata(pdev, NULL);
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);

	pm_runtime_disable(&pdev->dev);
	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_RUNTIME
static int samsung_keypad_runtime_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	unsigned int val;
	int error;

	if (keypad->stopped)
		return 0;

	/* This may fail on some SoCs due to lack of controller support */
	error = enable_irq_wake(keypad->irq);
	if (!error)
		keypad->wake_enabled = true;

	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	val |= SAMSUNG_KEYIFCON_WAKEUPEN;
	writel(val, keypad->base + SAMSUNG_KEYIFCON);

	clk_disable(keypad->clk);

	return 0;
}

static int samsung_keypad_runtime_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	unsigned int val;

	if (keypad->stopped)
		return 0;

	clk_enable(keypad->clk);

	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
	writel(val, keypad->base + SAMSUNG_KEYIFCON);

	if (keypad->wake_enabled)
		disable_irq_wake(keypad->irq);

	return 0;
}
#endif

#ifdef CONFIG_PM_SLEEP
static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
					 bool enable)
{
	unsigned int val;

	clk_enable(keypad->clk);

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

static const struct dev_pm_ops samsung_keypad_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
	SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
			   samsung_keypad_runtime_resume, NULL)
};

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,
		.pm	= &samsung_keypad_pm_ops,
	},
	.id_table	= samsung_keypad_driver_ids,
};
module_platform_driver(samsung_keypad_driver);

MODULE_DESCRIPTION("Samsung keypad driver");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
MODULE_LICENSE("GPL");
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>
48c98b1b MB	23	#include <linux/pm.h>
48c98b1b MB	24	#include <linux/pm_runtime.h>
0fffed27 JS	25	#include <linux/slab.h>
0fffed27 JS	26	#include <linux/sched.h>
8d964a28	27	#include <linux/input/samsung-keypad.h>
0fffed27 JS	28
	29	#define SAMSUNG_KEYIFCON 0x00
	30	#define SAMSUNG_KEYIFSTSCLR 0x04
	31	#define SAMSUNG_KEYIFCOL 0x08
	32	#define SAMSUNG_KEYIFROW 0x0c
	33	#define SAMSUNG_KEYIFFC 0x10
	34
	35	/* SAMSUNG_KEYIFCON */
	36	#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
	37	#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
	38	#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
	39	#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
	40	#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
	41
	42	/* SAMSUNG_KEYIFSTSCLR */
	43	#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
	44	#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
	45	#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
	46	#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
	47	#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
	48	#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
	49
	50	/* SAMSUNG_KEYIFCOL */
	51	#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
	52	#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
	53
	54	/* SAMSUNG_KEYIFROW */
	55	#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
	56	#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
	57
	58	/* SAMSUNG_KEYIFFC */
	59	#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
	60
	61	enum samsung_keypad_type {
	62	KEYPAD_TYPE_SAMSUNG,
	63	KEYPAD_TYPE_S5PV210,
	64	};
	65
	66	struct samsung_keypad {
	67	struct input_dev *input_dev;
48c98b1b	68	struct platform_device *pdev;
0fffed27 JS	69	struct clk *clk;
	70	void __iomem *base;
	71	wait_queue_head_t wait;
	72	bool stopped;
48c98b1b	73	bool wake_enabled;
0fffed27 JS	74	int irq;
	75	unsigned int row_shift;
	76	unsigned int rows;
	77	unsigned int cols;
	78	unsigned int row_state[SAMSUNG_MAX_COLS];
	79	unsigned short keycodes[];
	80	};
	81
	82	static int samsung_keypad_is_s5pv210(struct device *dev)
	83	{
	84	struct platform_device *pdev = to_platform_device(dev);
	85	enum samsung_keypad_type type =
	86	platform_get_device_id(pdev)->driver_data;
	87
	88	return type == KEYPAD_TYPE_S5PV210;
	89	}
	90
	91	static void samsung_keypad_scan(struct samsung_keypad *keypad,
	92	unsigned int *row_state)
	93	{
	94	struct device *dev = keypad->input_dev->dev.parent;
	95	unsigned int col;
	96	unsigned int val;
	97
	98	for (col = 0; col < keypad->cols; col++) {
	99	if (samsung_keypad_is_s5pv210(dev)) {
	100	val = S5PV210_KEYIFCOLEN_MASK;
	101	val &= ~(1 << col) << 8;
	102	} else {
	103	val = SAMSUNG_KEYIFCOL_MASK;
	104	val &= ~(1 << col);
	105	}
	106
	107	writel(val, keypad->base + SAMSUNG_KEYIFCOL);
	108	mdelay(1);
	109
	110	val = readl(keypad->base + SAMSUNG_KEYIFROW);
	111	row_state[col] = ~val & ((1 << keypad->rows) - 1);
	112	}
	113
	114	/* KEYIFCOL reg clear */
	115	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
	116	}
	117
	118	static bool samsung_keypad_report(struct samsung_keypad *keypad,
	119	unsigned int *row_state)
	120	{
	121	struct input_dev *input_dev = keypad->input_dev;
	122	unsigned int changed;
	123	unsigned int pressed;
	124	unsigned int key_down = 0;
	125	unsigned int val;
	126	unsigned int col, row;
	127
	128	for (col = 0; col < keypad->cols; col++) {
	129	changed = row_state[col] ^ keypad->row_state[col];
	130	key_down \|= row_state[col];
	131	if (!changed)
	132	continue;
	133
	134	for (row = 0; row < keypad->rows; row++) {
	135	if (!(changed & (1 << row)))
	136	continue;
	137
138	pressed = row_state[col] & (1 << row);
139
140	dev_dbg(&keypad->input_dev->dev,
141	"key %s, row: %d, col: %d\n",
142	pressed ? "pressed" : "released", row, col);
143
144	val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
145
146	input_event(input_dev, EV_MSC, MSC_SCAN, val);
147	input_report_key(input_dev,
148	keypad->keycodes[val], pressed);
149	}
150	input_sync(keypad->input_dev);
151	}
152
153	memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
154
155	return key_down;
156	}
157
158	static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
159	{
160	struct samsung_keypad *keypad = dev_id;
161	unsigned int row_state[SAMSUNG_MAX_COLS];
162	unsigned int val;
163	bool key_down;
164
48c98b1b MB	165	pm_runtime_get_sync(&keypad->pdev->dev);
48c98b1b MB	166
0fffed27 JS	167	do {
	168	val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
	169	/* Clear interrupt. */
	170	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
	171
	172	samsung_keypad_scan(keypad, row_state);
	173
	174	key_down = samsung_keypad_report(keypad, row_state);
	175	if (key_down)
	176	wait_event_timeout(keypad->wait, keypad->stopped,
	177	msecs_to_jiffies(50));
	178
	179	} while (key_down && !keypad->stopped);
	180
48c98b1b MB	181	pm_runtime_put_sync(&keypad->pdev->dev);
48c98b1b MB	182
0fffed27 JS	183	return IRQ_HANDLED;
	184	}
	185
	186	static void samsung_keypad_start(struct samsung_keypad *keypad)
	187	{
	188	unsigned int val;
	189
48c98b1b MB	190	pm_runtime_get_sync(&keypad->pdev->dev);
48c98b1b MB	191
0fffed27 JS	192	/* Tell IRQ thread that it may poll the device. */
	193	keypad->stopped = false;
	194
	195	clk_enable(keypad->clk);
	196
	197	/* Enable interrupt bits. */
	198	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	199	val \|= SAMSUNG_KEYIFCON_INT_F_EN \| SAMSUNG_KEYIFCON_INT_R_EN;
	200	writel(val, keypad->base + SAMSUNG_KEYIFCON);
	201
	202	/* KEYIFCOL reg clear. */
	203	writel(0, keypad->base + SAMSUNG_KEYIFCOL);
48c98b1b MB	204
48c98b1b MB	205	pm_runtime_put_sync(&keypad->pdev->dev);
0fffed27 JS	206	}
	207
	208	static void samsung_keypad_stop(struct samsung_keypad *keypad)
	209	{
	210	unsigned int val;
	211
48c98b1b MB	212	pm_runtime_get_sync(&keypad->pdev->dev);
48c98b1b MB	213
0fffed27 JS	214	/* Signal IRQ thread to stop polling and disable the handler. */
	215	keypad->stopped = true;
	216	wake_up(&keypad->wait);
	217	disable_irq(keypad->irq);
	218
	219	/* Clear interrupt. */
	220	writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
	221
	222	/* Disable interrupt bits. */
	223	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	224	val &= ~(SAMSUNG_KEYIFCON_INT_F_EN \| SAMSUNG_KEYIFCON_INT_R_EN);
	225	writel(val, keypad->base + SAMSUNG_KEYIFCON);
	226
	227	clk_disable(keypad->clk);
	228
	229	/*
	230	* Now that chip should not generate interrupts we can safely
	231	* re-enable the handler.
	232	*/
	233	enable_irq(keypad->irq);
48c98b1b MB	234
48c98b1b MB	235	pm_runtime_put_sync(&keypad->pdev->dev);
0fffed27 JS	236	}
	237
	238	static int samsung_keypad_open(struct input_dev *input_dev)
	239	{
	240	struct samsung_keypad *keypad = input_get_drvdata(input_dev);
	241
	242	samsung_keypad_start(keypad);
	243
	244	return 0;
	245	}
	246
	247	static void samsung_keypad_close(struct input_dev *input_dev)
	248	{
	249	struct samsung_keypad *keypad = input_get_drvdata(input_dev);
	250
	251	samsung_keypad_stop(keypad);
	252	}
	253
	254	static int __devinit samsung_keypad_probe(struct platform_device *pdev)
	255	{
	256	const struct samsung_keypad_platdata *pdata;
	257	const struct matrix_keymap_data *keymap_data;
	258	struct samsung_keypad *keypad;
	259	struct resource *res;
	260	struct input_dev *input_dev;
	261	unsigned int row_shift;
	262	unsigned int keymap_size;
	263	int error;
	264
	265	pdata = pdev->dev.platform_data;
	266	if (!pdata) {
	267	dev_err(&pdev->dev, "no platform data defined\n");
	268	return -EINVAL;
	269	}
	270
	271	keymap_data = pdata->keymap_data;
	272	if (!keymap_data) {
	273	dev_err(&pdev->dev, "no keymap data defined\n");
	274	return -EINVAL;
	275	}
	276
	277	if (!pdata->rows \|\| pdata->rows > SAMSUNG_MAX_ROWS)
	278	return -EINVAL;
	279
	280	if (!pdata->cols \|\| pdata->cols > SAMSUNG_MAX_COLS)
	281	return -EINVAL;
	282
	283	/* initialize the gpio */
	284	if (pdata->cfg_gpio)
	285	pdata->cfg_gpio(pdata->rows, pdata->cols);
	286
	287	row_shift = get_count_order(pdata->cols);
	288	keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
	289
	290	keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
	291	input_dev = input_allocate_device();
	292	if (!keypad \|\| !input_dev) {
	293	error = -ENOMEM;
	294	goto err_free_mem;
	295	}
	296
	297	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	298	if (!res) {
	299	error = -ENODEV;
300	goto err_free_mem;
301	}
302
303	keypad->base = ioremap(res->start, resource_size(res));
304	if (!keypad->base) {
305	error = -EBUSY;
306	goto err_free_mem;
307	}
308
309	keypad->clk = clk_get(&pdev->dev, "keypad");
310	if (IS_ERR(keypad->clk)) {
311	dev_err(&pdev->dev, "failed to get keypad clk\n");
312	error = PTR_ERR(keypad->clk);
313	goto err_unmap_base;
314	}
315
316	keypad->input_dev = input_dev;
48c98b1b	317	keypad->pdev = pdev;
0fffed27 JS	318	keypad->row_shift = row_shift;
	319	keypad->rows = pdata->rows;
	320	keypad->cols = pdata->cols;
48c98b1b	321	keypad->stopped = true;
0fffed27 JS	322	init_waitqueue_head(&keypad->wait);
	323
	324	input_dev->name = pdev->name;
	325	input_dev->id.bustype = BUS_HOST;
	326	input_dev->dev.parent = &pdev->dev;
	327	input_set_drvdata(input_dev, keypad);
	328
	329	input_dev->open = samsung_keypad_open;
	330	input_dev->close = samsung_keypad_close;
	331
	332	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	333	if (!pdata->no_autorepeat)
	334	input_dev->evbit[0] \|= BIT_MASK(EV_REP);
	335
	336	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	337
	338	input_dev->keycode = keypad->keycodes;
	339	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
	340	input_dev->keycodemax = pdata->rows << row_shift;
	341
	342	matrix_keypad_build_keymap(keymap_data, row_shift,
	343	input_dev->keycode, input_dev->keybit);
	344
	345	keypad->irq = platform_get_irq(pdev, 0);
	346	if (keypad->irq < 0) {
	347	error = keypad->irq;
	348	goto err_put_clk;
	349	}
	350
	351	error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
	352	IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
	353	if (error) {
	354	dev_err(&pdev->dev, "failed to register keypad interrupt\n");
	355	goto err_put_clk;
	356	}
	357
48c98b1b MB	358	device_init_wakeup(&pdev->dev, pdata->wakeup);
	359	platform_set_drvdata(pdev, keypad);
	360	pm_runtime_enable(&pdev->dev);
	361
0fffed27 JS	362	error = input_register_device(keypad->input_dev);
	363	if (error)
	364	goto err_free_irq;
	365
0fffed27 JS	366	return 0;
	367
	368	err_free_irq:
	369	free_irq(keypad->irq, keypad);
48c98b1b MB	370	pm_runtime_disable(&pdev->dev);
	371	device_init_wakeup(&pdev->dev, 0);
	372	platform_set_drvdata(pdev, NULL);
0fffed27 JS	373	err_put_clk:
	374	clk_put(keypad->clk);
	375	err_unmap_base:
	376	iounmap(keypad->base);
	377	err_free_mem:
	378	input_free_device(input_dev);
	379	kfree(keypad);
	380
	381	return error;
	382	}
	383
	384	static int __devexit samsung_keypad_remove(struct platform_device *pdev)
	385	{
	386	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	387
48c98b1b	388	pm_runtime_disable(&pdev->dev);
0fffed27 JS	389	device_init_wakeup(&pdev->dev, 0);
	390	platform_set_drvdata(pdev, NULL);
	391
	392	input_unregister_device(keypad->input_dev);
	393
	394	/*
	395	* It is safe to free IRQ after unregistering device because
	396	* samsung_keypad_close will shut off interrupts.
	397	*/
	398	free_irq(keypad->irq, keypad);
	399
	400	clk_put(keypad->clk);
	401
	402	iounmap(keypad->base);
	403	kfree(keypad);
	404
	405	return 0;
	406	}
	407
48c98b1b MB	408	#ifdef CONFIG_PM_RUNTIME
	409	static int samsung_keypad_runtime_suspend(struct device *dev)
	410	{
	411	struct platform_device *pdev = to_platform_device(dev);
	412	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	413	unsigned int val;
	414	int error;
	415
	416	if (keypad->stopped)
	417	return 0;
	418
	419	/* This may fail on some SoCs due to lack of controller support */
	420	error = enable_irq_wake(keypad->irq);
	421	if (!error)
	422	keypad->wake_enabled = true;
	423
	424	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	425	val \|= SAMSUNG_KEYIFCON_WAKEUPEN;
	426	writel(val, keypad->base + SAMSUNG_KEYIFCON);
	427
	428	clk_disable(keypad->clk);
	429
	430	return 0;
	431	}
	432
	433	static int samsung_keypad_runtime_resume(struct device *dev)
	434	{
	435	struct platform_device *pdev = to_platform_device(dev);
	436	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	437	unsigned int val;
	438
	439	if (keypad->stopped)
	440	return 0;
	441
	442	clk_enable(keypad->clk);
	443
	444	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	445	val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
	446	writel(val, keypad->base + SAMSUNG_KEYIFCON);
	447
	448	if (keypad->wake_enabled)
	449	disable_irq_wake(keypad->irq);
	450
	451	return 0;
	452	}
	453	#endif
	454
400bf299	455	#ifdef CONFIG_PM_SLEEP
0fffed27 JS	456	static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
	457	bool enable)
	458	{
0fffed27 JS	459	unsigned int val;
	460
	461	clk_enable(keypad->clk);
	462
	463	val = readl(keypad->base + SAMSUNG_KEYIFCON);
	464	if (enable) {
	465	val \|= SAMSUNG_KEYIFCON_WAKEUPEN;
48c98b1b	466	if (device_may_wakeup(&keypad->pdev->dev))
0fffed27 JS	467	enable_irq_wake(keypad->irq);
	468	} else {
	469	val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
48c98b1b	470	if (device_may_wakeup(&keypad->pdev->dev))
0fffed27 JS	471	disable_irq_wake(keypad->irq);
	472	}
	473	writel(val, keypad->base + SAMSUNG_KEYIFCON);
	474
	475	clk_disable(keypad->clk);
	476	}
	477
	478	static int samsung_keypad_suspend(struct device *dev)
	479	{
	480	struct platform_device *pdev = to_platform_device(dev);
	481	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	482	struct input_dev *input_dev = keypad->input_dev;
	483
	484	mutex_lock(&input_dev->mutex);
	485
	486	if (input_dev->users)
	487	samsung_keypad_stop(keypad);
	488
	489	samsung_keypad_toggle_wakeup(keypad, true);
	490
	491	mutex_unlock(&input_dev->mutex);
	492
	493	return 0;
	494	}
	495
	496	static int samsung_keypad_resume(struct device *dev)
	497	{
	498	struct platform_device *pdev = to_platform_device(dev);
	499	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
	500	struct input_dev *input_dev = keypad->input_dev;
	501
	502	mutex_lock(&input_dev->mutex);
	503
	504	samsung_keypad_toggle_wakeup(keypad, false);
	505
	506	if (input_dev->users)
	507	samsung_keypad_start(keypad);
	508
	509	mutex_unlock(&input_dev->mutex);
	510
	511	return 0;
	512	}
0fffed27 JS	513	#endif
0fffed27 JS	514
48c98b1b MB	515	static const struct dev_pm_ops samsung_keypad_pm_ops = {
	516	SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
	517	SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
	518	samsung_keypad_runtime_resume, NULL)
	519	};
400bf299	520
0fffed27 JS	521	static struct platform_device_id samsung_keypad_driver_ids[] = {
	522	{
	523	.name = "samsung-keypad",
	524	.driver_data = KEYPAD_TYPE_SAMSUNG,
	525	}, {
	526	.name = "s5pv210-keypad",
	527	.driver_data = KEYPAD_TYPE_S5PV210,
	528	},
	529	{ },
	530	};
	531	MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
	532
	533	static struct platform_driver samsung_keypad_driver = {
	534	.probe = samsung_keypad_probe,
	535	.remove = __devexit_p(samsung_keypad_remove),
	536	.driver = {
	537	.name = "samsung-keypad",
	538	.owner = THIS_MODULE,
0fffed27	539	.pm = &samsung_keypad_pm_ops,
0fffed27 JS	540	},
	541	.id_table = samsung_keypad_driver_ids,
	542	};
5146c84f	543	module_platform_driver(samsung_keypad_driver);
0fffed27 JS	544
	545	MODULE_DESCRIPTION("Samsung keypad driver");
	546	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
	547	MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
	548	MODULE_LICENSE("GPL");