[deliverable/linux.git] / drivers / input / keyboard / matrix_keypad.c

/*
 *  GPIO driven matrix keyboard driver
 *
 *  Copyright (c) 2008 Marek Vasut <marek.vasut@gmail.com>
 *
 *  Based on corgikbd.c
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#include <linux/types.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>

struct matrix_keypad {
	const struct matrix_keypad_platform_data *pdata;
	struct input_dev *input_dev;
	unsigned int row_shift;

	DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);

	uint32_t last_key_state[MATRIX_MAX_COLS];
	struct delayed_work work;
	spinlock_t lock;
	bool scan_pending;
	bool stopped;
	bool gpio_all_disabled;

	unsigned short keycodes[];
};

/*
 * NOTE: normally the GPIO has to be put into HiZ when de-activated to cause
 * minmal side effect when scanning other columns, here it is configured to
 * be input, and it should work on most platforms.
 */
static void __activate_col(const struct matrix_keypad_platform_data *pdata,
			   int col, bool on)
{
	bool level_on = !pdata->active_low;

	if (on) {
		gpio_direction_output(pdata->col_gpios[col], level_on);
	} else {
		gpio_set_value_cansleep(pdata->col_gpios[col], !level_on);
		gpio_direction_input(pdata->col_gpios[col]);
	}
}

static void activate_col(const struct matrix_keypad_platform_data *pdata,
			 int col, bool on)
{
	__activate_col(pdata, col, on);

	if (on && pdata->col_scan_delay_us)
		udelay(pdata->col_scan_delay_us);
}

static void activate_all_cols(const struct matrix_keypad_platform_data *pdata,
			      bool on)
{
	int col;

	for (col = 0; col < pdata->num_col_gpios; col++)
		__activate_col(pdata, col, on);
}

static bool row_asserted(const struct matrix_keypad_platform_data *pdata,
			 int row)
{
	return gpio_get_value_cansleep(pdata->row_gpios[row]) ?
			!pdata->active_low : pdata->active_low;
}

static void enable_row_irqs(struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	int i;

	if (pdata->clustered_irq > 0)
		enable_irq(pdata->clustered_irq);
	else {
		for (i = 0; i < pdata->num_row_gpios; i++)
			enable_irq(gpio_to_irq(pdata->row_gpios[i]));
	}
}

static void disable_row_irqs(struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	int i;

	if (pdata->clustered_irq > 0)
		disable_irq_nosync(pdata->clustered_irq);
	else {
		for (i = 0; i < pdata->num_row_gpios; i++)
			disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
	}
}

/*
 * This gets the keys from keyboard and reports it to input subsystem
 */
static void matrix_keypad_scan(struct work_struct *work)
{
	struct matrix_keypad *keypad =
		container_of(work, struct matrix_keypad, work.work);
	struct input_dev *input_dev = keypad->input_dev;
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	uint32_t new_state[MATRIX_MAX_COLS];
	int row, col, code;

	/* de-activate all columns for scanning */
	activate_all_cols(pdata, false);

	memset(new_state, 0, sizeof(new_state));

	/* assert each column and read the row status out */
	for (col = 0; col < pdata->num_col_gpios; col++) {

		activate_col(pdata, col, true);

		for (row = 0; row < pdata->num_row_gpios; row++)
			new_state[col] |=
				row_asserted(pdata, row) ? (1 << row) : 0;

		activate_col(pdata, col, false);
	}

	for (col = 0; col < pdata->num_col_gpios; col++) {
		uint32_t bits_changed;

		bits_changed = keypad->last_key_state[col] ^ new_state[col];
		if (bits_changed == 0)
			continue;

		for (row = 0; row < pdata->num_row_gpios; row++) {
			if ((bits_changed & (1 << row)) == 0)
				continue;

			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
			input_event(input_dev, EV_MSC, MSC_SCAN, code);
			input_report_key(input_dev,
					 keypad->keycodes[code],
					 new_state[col] & (1 << row));
		}
	}
	input_sync(input_dev);

	memcpy(keypad->last_key_state, new_state, sizeof(new_state));

	activate_all_cols(pdata, true);

	/* Enable IRQs again */
	spin_lock_irq(&keypad->lock);
	keypad->scan_pending = false;
	enable_row_irqs(keypad);
	spin_unlock_irq(&keypad->lock);
}

static irqreturn_t matrix_keypad_interrupt(int irq, void *id)
{
	struct matrix_keypad *keypad = id;
	unsigned long flags;

	spin_lock_irqsave(&keypad->lock, flags);

	/*
	 * See if another IRQ beaten us to it and scheduled the
	 * scan already. In that case we should not try to
	 * disable IRQs again.
	 */
	if (unlikely(keypad->scan_pending || keypad->stopped))
		goto out;

	disable_row_irqs(keypad);
	keypad->scan_pending = true;
	schedule_delayed_work(&keypad->work,
		msecs_to_jiffies(keypad->pdata->debounce_ms));

out:
	spin_unlock_irqrestore(&keypad->lock, flags);
	return IRQ_HANDLED;
}

static int matrix_keypad_start(struct input_dev *dev)
{
	struct matrix_keypad *keypad = input_get_drvdata(dev);

	keypad->stopped = false;
	mb();

	/*
	 * Schedule an immediate key scan to capture current key state;
	 * columns will be activated and IRQs be enabled after the scan.
	 */
	schedule_delayed_work(&keypad->work, 0);

	return 0;
}

static void matrix_keypad_stop(struct input_dev *dev)
{
	struct matrix_keypad *keypad = input_get_drvdata(dev);

	keypad->stopped = true;
	mb();
	flush_work(&keypad->work.work);
	/*
	 * matrix_keypad_scan() will leave IRQs enabled;
	 * we should disable them now.
	 */
	disable_row_irqs(keypad);
}

#ifdef CONFIG_PM_SLEEP
static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	unsigned int gpio;
	int i;

	if (pdata->clustered_irq > 0) {
		if (enable_irq_wake(pdata->clustered_irq) == 0)
			keypad->gpio_all_disabled = true;
	} else {

		for (i = 0; i < pdata->num_row_gpios; i++) {
			if (!test_bit(i, keypad->disabled_gpios)) {
				gpio = pdata->row_gpios[i];

				if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
					__set_bit(i, keypad->disabled_gpios);
			}
		}
	}
}

static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	unsigned int gpio;
	int i;

	if (pdata->clustered_irq > 0) {
		if (keypad->gpio_all_disabled) {
			disable_irq_wake(pdata->clustered_irq);
			keypad->gpio_all_disabled = false;
		}
	} else {
		for (i = 0; i < pdata->num_row_gpios; i++) {
			if (test_and_clear_bit(i, keypad->disabled_gpios)) {
				gpio = pdata->row_gpios[i];
				disable_irq_wake(gpio_to_irq(gpio));
			}
		}
	}
}

static int matrix_keypad_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct matrix_keypad *keypad = platform_get_drvdata(pdev);

	matrix_keypad_stop(keypad->input_dev);

	if (device_may_wakeup(&pdev->dev))
		matrix_keypad_enable_wakeup(keypad);

	return 0;
}

static int matrix_keypad_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct matrix_keypad *keypad = platform_get_drvdata(pdev);

	if (device_may_wakeup(&pdev->dev))
		matrix_keypad_disable_wakeup(keypad);

	matrix_keypad_start(keypad->input_dev);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops,
			 matrix_keypad_suspend, matrix_keypad_resume);

static int __devinit matrix_keypad_init_gpio(struct platform_device *pdev,
					     struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	int i, err;

	/* initialized strobe lines as outputs, activated */
	for (i = 0; i < pdata->num_col_gpios; i++) {
		err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col");
		if (err) {
			dev_err(&pdev->dev,
				"failed to request GPIO%d for COL%d\n",
				pdata->col_gpios[i], i);
			goto err_free_cols;
		}

		gpio_direction_output(pdata->col_gpios[i], !pdata->active_low);
	}

	for (i = 0; i < pdata->num_row_gpios; i++) {
		err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row");
		if (err) {
			dev_err(&pdev->dev,
				"failed to request GPIO%d for ROW%d\n",
				pdata->row_gpios[i], i);
			goto err_free_rows;
		}

		gpio_direction_input(pdata->row_gpios[i]);
	}

	if (pdata->clustered_irq > 0) {
		err = request_irq(pdata->clustered_irq,
				matrix_keypad_interrupt,
				pdata->clustered_irq_flags,
				"matrix-keypad", keypad);
		if (err) {
			dev_err(&pdev->dev,
				"Unable to acquire clustered interrupt\n");
			goto err_free_rows;
		}
	} else {
		for (i = 0; i < pdata->num_row_gpios; i++) {
			err = request_irq(gpio_to_irq(pdata->row_gpios[i]),
					matrix_keypad_interrupt,
					IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING,
					"matrix-keypad", keypad);
			if (err) {
				dev_err(&pdev->dev,
					"Unable to acquire interrupt for GPIO line %i\n",
					pdata->row_gpios[i]);
				goto err_free_irqs;
			}
		}
	}

	/* initialized as disabled - enabled by input->open */
	disable_row_irqs(keypad);
	return 0;

err_free_irqs:
	while (--i >= 0)
		free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
	i = pdata->num_row_gpios;
err_free_rows:
	while (--i >= 0)
		gpio_free(pdata->row_gpios[i]);
	i = pdata->num_col_gpios;
err_free_cols:
	while (--i >= 0)
		gpio_free(pdata->col_gpios[i]);

	return err;
}

static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
{
	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	int i;

	if (pdata->clustered_irq > 0) {
		free_irq(pdata->clustered_irq, keypad);
	} else {
		for (i = 0; i < pdata->num_row_gpios; i++)
			free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
	}

	for (i = 0; i < pdata->num_row_gpios; i++)
		gpio_free(pdata->row_gpios[i]);

	for (i = 0; i < pdata->num_col_gpios; i++)
		gpio_free(pdata->col_gpios[i]);
}

static int __devinit matrix_keypad_probe(struct platform_device *pdev)
{
	const struct matrix_keypad_platform_data *pdata;
	const struct matrix_keymap_data *keymap_data;
	struct matrix_keypad *keypad;
	struct input_dev *input_dev;
	unsigned int row_shift;
	size_t keymap_size;
	int err;

	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;
	}

	row_shift = get_count_order(pdata->num_col_gpios);
	keymap_size = (pdata->num_row_gpios << row_shift) *
			sizeof(keypad->keycodes[0]);
	keypad = kzalloc(sizeof(struct matrix_keypad) + keymap_size,
			 GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!keypad || !input_dev) {
		err = -ENOMEM;
		goto err_free_mem;
	}

	keypad->input_dev = input_dev;
	keypad->pdata = pdata;
	keypad->row_shift = row_shift;
	keypad->stopped = true;
	INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
	spin_lock_init(&keypad->lock);

	input_dev->name		= pdev->name;
	input_dev->id.bustype	= BUS_HOST;
	input_dev->dev.parent	= &pdev->dev;
	input_dev->open		= matrix_keypad_start;
	input_dev->close	= matrix_keypad_stop;

	err = matrix_keypad_build_keymap(keymap_data, NULL,
					 pdata->num_row_gpios,
					 pdata->num_col_gpios,
					 keypad->keycodes, input_dev);
	if (err)
		goto err_free_mem;

	if (!pdata->no_autorepeat)
		__set_bit(EV_REP, input_dev->evbit);
	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	input_set_drvdata(input_dev, keypad);

	err = matrix_keypad_init_gpio(pdev, keypad);
	if (err)
		goto err_free_mem;

	err = input_register_device(keypad->input_dev);
	if (err)
		goto err_free_gpio;

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

	return 0;

err_free_gpio:
	matrix_keypad_free_gpio(keypad);
err_free_mem:
	input_free_device(input_dev);
	kfree(keypad);
	return err;
}

static int __devexit matrix_keypad_remove(struct platform_device *pdev)
{
	struct matrix_keypad *keypad = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);

	matrix_keypad_free_gpio(keypad);
	input_unregister_device(keypad->input_dev);
	kfree(keypad);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver matrix_keypad_driver = {
	.probe		= matrix_keypad_probe,
	.remove		= __devexit_p(matrix_keypad_remove),
	.driver		= {
		.name	= "matrix-keypad",
		.owner	= THIS_MODULE,
		.pm	= &matrix_keypad_pm_ops,
	},
};
module_platform_driver(matrix_keypad_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:matrix-keypad");
Commit	Line	Data
bab7614d EM	1	/*
	2	* GPIO driven matrix keyboard driver
	3	*
	4	* Copyright (c) 2008 Marek Vasut <marek.vasut@gmail.com>
	5	*
	6	* Based on corgikbd.c
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/types.h>
	15	#include <linux/delay.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/init.h>
	18	#include <linux/input.h>
	19	#include <linux/irq.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/jiffies.h>
	22	#include <linux/module.h>
	23	#include <linux/gpio.h>
	24	#include <linux/input/matrix_keypad.h>
5a0e3ad6	25	#include <linux/slab.h>
bab7614d EM	26
	27	struct matrix_keypad {
	28	const struct matrix_keypad_platform_data *pdata;
	29	struct input_dev *input_dev;
d82f1c35	30	unsigned int row_shift;
bab7614d	31
dd219234 DT	32	DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
dd219234 DT	33
bab7614d EM	34	uint32_t last_key_state[MATRIX_MAX_COLS];
bab7614d EM	35	struct delayed_work work;
dd219234	36	spinlock_t lock;
bab7614d EM	37	bool scan_pending;
bab7614d EM	38	bool stopped;
fb76dd10	39	bool gpio_all_disabled;
01111fcd DT	40
01111fcd DT	41	unsigned short keycodes[];
bab7614d EM	42	};
	43
	44	/*
	45	* NOTE: normally the GPIO has to be put into HiZ when de-activated to cause
	46	* minmal side effect when scanning other columns, here it is configured to
	47	* be input, and it should work on most platforms.
	48	*/
	49	static void __activate_col(const struct matrix_keypad_platform_data *pdata,
	50	int col, bool on)
	51	{
	52	bool level_on = !pdata->active_low;
	53
	54	if (on) {
	55	gpio_direction_output(pdata->col_gpios[col], level_on);
	56	} else {
	57	gpio_set_value_cansleep(pdata->col_gpios[col], !level_on);
	58	gpio_direction_input(pdata->col_gpios[col]);
	59	}
	60	}
	61
	62	static void activate_col(const struct matrix_keypad_platform_data *pdata,
	63	int col, bool on)
	64	{
	65	__activate_col(pdata, col, on);
	66
	67	if (on && pdata->col_scan_delay_us)
	68	udelay(pdata->col_scan_delay_us);
	69	}
	70
	71	static void activate_all_cols(const struct matrix_keypad_platform_data *pdata,
	72	bool on)
	73	{
	74	int col;
	75
	76	for (col = 0; col < pdata->num_col_gpios; col++)
	77	__activate_col(pdata, col, on);
	78	}
	79
	80	static bool row_asserted(const struct matrix_keypad_platform_data *pdata,
	81	int row)
	82	{
	83	return gpio_get_value_cansleep(pdata->row_gpios[row]) ?
	84	!pdata->active_low : pdata->active_low;
	85	}
	86
	87	static void enable_row_irqs(struct matrix_keypad *keypad)
	88	{
	89	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	90	int i;
	91
fb76dd10 LF	92	if (pdata->clustered_irq > 0)
	93	enable_irq(pdata->clustered_irq);
	94	else {
	95	for (i = 0; i < pdata->num_row_gpios; i++)
	96	enable_irq(gpio_to_irq(pdata->row_gpios[i]));
	97	}
bab7614d EM	98	}
	99
	100	static void disable_row_irqs(struct matrix_keypad *keypad)
	101	{
	102	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	103	int i;
	104
fb76dd10 LF	105	if (pdata->clustered_irq > 0)
	106	disable_irq_nosync(pdata->clustered_irq);
	107	else {
	108	for (i = 0; i < pdata->num_row_gpios; i++)
	109	disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
	110	}
bab7614d EM	111	}
	112
	113	/*
	114	* This gets the keys from keyboard and reports it to input subsystem
	115	*/
	116	static void matrix_keypad_scan(struct work_struct *work)
	117	{
	118	struct matrix_keypad *keypad =
	119	container_of(work, struct matrix_keypad, work.work);
	120	struct input_dev *input_dev = keypad->input_dev;
	121	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	122	uint32_t new_state[MATRIX_MAX_COLS];
	123	int row, col, code;
	124
	125	/* de-activate all columns for scanning */
	126	activate_all_cols(pdata, false);
	127
	128	memset(new_state, 0, sizeof(new_state));
	129
	130	/* assert each column and read the row status out */
	131	for (col = 0; col < pdata->num_col_gpios; col++) {
	132
	133	activate_col(pdata, col, true);
	134
	135	for (row = 0; row < pdata->num_row_gpios; row++)
	136	new_state[col] \|=
	137	row_asserted(pdata, row) ? (1 << row) : 0;
	138
	139	activate_col(pdata, col, false);
	140	}
	141
	142	for (col = 0; col < pdata->num_col_gpios; col++) {
	143	uint32_t bits_changed;
	144
	145	bits_changed = keypad->last_key_state[col] ^ new_state[col];
	146	if (bits_changed == 0)
	147	continue;
	148
	149	for (row = 0; row < pdata->num_row_gpios; row++) {
	150	if ((bits_changed & (1 << row)) == 0)
	151	continue;
	152
d82f1c35	153	code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
bab7614d EM	154	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	155	input_report_key(input_dev,
	156	keypad->keycodes[code],
	157	new_state[col] & (1 << row));
	158	}
	159	}
	160	input_sync(input_dev);
	161
	162	memcpy(keypad->last_key_state, new_state, sizeof(new_state));
	163
	164	activate_all_cols(pdata, true);
	165
	166	/* Enable IRQs again */
	167	spin_lock_irq(&keypad->lock);
	168	keypad->scan_pending = false;
	169	enable_row_irqs(keypad);
	170	spin_unlock_irq(&keypad->lock);
	171	}
	172
	173	static irqreturn_t matrix_keypad_interrupt(int irq, void *id)
	174	{
	175	struct matrix_keypad *keypad = id;
	176	unsigned long flags;
	177
	178	spin_lock_irqsave(&keypad->lock, flags);
	179
	180	/*
	181	* See if another IRQ beaten us to it and scheduled the
	182	* scan already. In that case we should not try to
	183	* disable IRQs again.
	184	*/
	185	if (unlikely(keypad->scan_pending \|\| keypad->stopped))
	186	goto out;
	187
	188	disable_row_irqs(keypad);
	189	keypad->scan_pending = true;
	190	schedule_delayed_work(&keypad->work,
	191	msecs_to_jiffies(keypad->pdata->debounce_ms));
	192
	193	out:
	194	spin_unlock_irqrestore(&keypad->lock, flags);
	195	return IRQ_HANDLED;
	196	}
	197
	198	static int matrix_keypad_start(struct input_dev *dev)
	199	{
	200	struct matrix_keypad *keypad = input_get_drvdata(dev);
	201
	202	keypad->stopped = false;
	203	mb();
	204
	205	/*
	206	* Schedule an immediate key scan to capture current key state;
	207	* columns will be activated and IRQs be enabled after the scan.
	208	*/
	209	schedule_delayed_work(&keypad->work, 0);
	210
	211	return 0;
	212	}
	213
	214	static void matrix_keypad_stop(struct input_dev *dev)
	215	{
	216	struct matrix_keypad *keypad = input_get_drvdata(dev);
	217
218	keypad->stopped = true;
219	mb();
220	flush_work(&keypad->work.work);
221	/*
222	* matrix_keypad_scan() will leave IRQs enabled;
223	* we should disable them now.
224	*/
225	disable_row_irqs(keypad);
226	}
227
0508c19a	228	#ifdef CONFIG_PM_SLEEP
fb76dd10	229	static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
bab7614d	230	{
bab7614d	231	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
fb76dd10	232	unsigned int gpio;
bab7614d EM	233	int i;
bab7614d EM	234
fb76dd10 LF	235	if (pdata->clustered_irq > 0) {
	236	if (enable_irq_wake(pdata->clustered_irq) == 0)
	237	keypad->gpio_all_disabled = true;
	238	} else {
bab7614d	239
dd219234 DT	240	for (i = 0; i < pdata->num_row_gpios; i++) {
dd219234 DT	241	if (!test_bit(i, keypad->disabled_gpios)) {
fb76dd10	242	gpio = pdata->row_gpios[i];
dd219234 DT	243
	244	if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
	245	__set_bit(i, keypad->disabled_gpios);
	246	}
	247	}
	248	}
bab7614d EM	249	}
bab7614d EM	250
fb76dd10	251	static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
bab7614d	252	{
bab7614d	253	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
fb76dd10	254	unsigned int gpio;
bab7614d EM	255	int i;
bab7614d EM	256
fb76dd10 LF	257	if (pdata->clustered_irq > 0) {
	258	if (keypad->gpio_all_disabled) {
	259	disable_irq_wake(pdata->clustered_irq);
	260	keypad->gpio_all_disabled = false;
	261	}
	262	} else {
dd219234 DT	263	for (i = 0; i < pdata->num_row_gpios; i++) {
dd219234 DT	264	if (test_and_clear_bit(i, keypad->disabled_gpios)) {
fb76dd10	265	gpio = pdata->row_gpios[i];
dd219234 DT	266	disable_irq_wake(gpio_to_irq(gpio));
	267	}
	268	}
	269	}
fb76dd10 LF	270	}
	271
	272	static int matrix_keypad_suspend(struct device *dev)
	273	{
	274	struct platform_device *pdev = to_platform_device(dev);
	275	struct matrix_keypad *keypad = platform_get_drvdata(pdev);
	276
	277	matrix_keypad_stop(keypad->input_dev);
	278
	279	if (device_may_wakeup(&pdev->dev))
	280	matrix_keypad_enable_wakeup(keypad);
	281
	282	return 0;
	283	}
	284
	285	static int matrix_keypad_resume(struct device *dev)
	286	{
	287	struct platform_device *pdev = to_platform_device(dev);
	288	struct matrix_keypad *keypad = platform_get_drvdata(pdev);
	289
	290	if (device_may_wakeup(&pdev->dev))
	291	matrix_keypad_disable_wakeup(keypad);
bab7614d EM	292
	293	matrix_keypad_start(keypad->input_dev);
	294
	295	return 0;
	296	}
bab7614d EM	297	#endif
bab7614d EM	298
0508c19a DT	299	static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops,
	300	matrix_keypad_suspend, matrix_keypad_resume);
	301
b83643eb DT	302	static int __devinit matrix_keypad_init_gpio(struct platform_device *pdev,
b83643eb DT	303	struct matrix_keypad *keypad)
bab7614d EM	304	{
bab7614d EM	305	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
b83643eb	306	int i, err;
bab7614d EM	307
	308	/* initialized strobe lines as outputs, activated */
	309	for (i = 0; i < pdata->num_col_gpios; i++) {
	310	err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col");
	311	if (err) {
	312	dev_err(&pdev->dev,
	313	"failed to request GPIO%d for COL%d\n",
	314	pdata->col_gpios[i], i);
	315	goto err_free_cols;
	316	}
	317
	318	gpio_direction_output(pdata->col_gpios[i], !pdata->active_low);
	319	}
	320
	321	for (i = 0; i < pdata->num_row_gpios; i++) {
	322	err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row");
	323	if (err) {
	324	dev_err(&pdev->dev,
	325	"failed to request GPIO%d for ROW%d\n",
	326	pdata->row_gpios[i], i);
	327	goto err_free_rows;
	328	}
	329
	330	gpio_direction_input(pdata->row_gpios[i]);
	331	}
	332
fb76dd10 LF	333	if (pdata->clustered_irq > 0) {
fb76dd10 LF	334	err = request_irq(pdata->clustered_irq,
bab7614d	335	matrix_keypad_interrupt,
fb76dd10	336	pdata->clustered_irq_flags,
bab7614d EM	337	"matrix-keypad", keypad);
	338	if (err) {
	339	dev_err(&pdev->dev,
fb76dd10 LF	340	"Unable to acquire clustered interrupt\n");
	341	goto err_free_rows;
	342	}
	343	} else {
	344	for (i = 0; i < pdata->num_row_gpios; i++) {
	345	err = request_irq(gpio_to_irq(pdata->row_gpios[i]),
	346	matrix_keypad_interrupt,
fb76dd10 LF	347	IRQF_TRIGGER_RISING \|
	348	IRQF_TRIGGER_FALLING,
	349	"matrix-keypad", keypad);
	350	if (err) {
	351	dev_err(&pdev->dev,
b83643eb	352	"Unable to acquire interrupt for GPIO line %i\n",
fb76dd10 LF	353	pdata->row_gpios[i]);
	354	goto err_free_irqs;
	355	}
bab7614d EM	356	}
	357	}
	358
	359	/* initialized as disabled - enabled by input->open */
	360	disable_row_irqs(keypad);
	361	return 0;
	362
	363	err_free_irqs:
	364	while (--i >= 0)
	365	free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
	366	i = pdata->num_row_gpios;
	367	err_free_rows:
	368	while (--i >= 0)
	369	gpio_free(pdata->row_gpios[i]);
	370	i = pdata->num_col_gpios;
	371	err_free_cols:
	372	while (--i >= 0)
	373	gpio_free(pdata->col_gpios[i]);
	374
	375	return err;
	376	}
	377
b83643eb DT	378	static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
	379	{
	380	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
	381	int i;
	382
	383	if (pdata->clustered_irq > 0) {
	384	free_irq(pdata->clustered_irq, keypad);
	385	} else {
	386	for (i = 0; i < pdata->num_row_gpios; i++)
	387	free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
	388	}
	389
	390	for (i = 0; i < pdata->num_row_gpios; i++)
	391	gpio_free(pdata->row_gpios[i]);
	392
	393	for (i = 0; i < pdata->num_col_gpios; i++)
	394	gpio_free(pdata->col_gpios[i]);
	395	}
	396
bab7614d EM	397	static int __devinit matrix_keypad_probe(struct platform_device *pdev)
	398	{
	399	const struct matrix_keypad_platform_data *pdata;
	400	const struct matrix_keymap_data *keymap_data;
	401	struct matrix_keypad *keypad;
	402	struct input_dev *input_dev;
d82f1c35	403	unsigned int row_shift;
01111fcd	404	size_t keymap_size;
bab7614d EM	405	int err;
	406
	407	pdata = pdev->dev.platform_data;
	408	if (!pdata) {
	409	dev_err(&pdev->dev, "no platform data defined\n");
	410	return -EINVAL;
	411	}
	412
	413	keymap_data = pdata->keymap_data;
	414	if (!keymap_data) {
	415	dev_err(&pdev->dev, "no keymap data defined\n");
	416	return -EINVAL;
	417	}
	418
d82f1c35	419	row_shift = get_count_order(pdata->num_col_gpios);
01111fcd DT	420	keymap_size = (pdata->num_row_gpios << row_shift) *
	421	sizeof(keypad->keycodes[0]);
	422	keypad = kzalloc(sizeof(struct matrix_keypad) + keymap_size,
	423	GFP_KERNEL);
bab7614d	424	input_dev = input_allocate_device();
01111fcd	425	if (!keypad \|\| !input_dev) {
bab7614d EM	426	err = -ENOMEM;
	427	goto err_free_mem;
	428	}
	429
	430	keypad->input_dev = input_dev;
	431	keypad->pdata = pdata;
d82f1c35	432	keypad->row_shift = row_shift;
bab7614d EM	433	keypad->stopped = true;
	434	INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
	435	spin_lock_init(&keypad->lock);
	436
	437	input_dev->name = pdev->name;
	438	input_dev->id.bustype = BUS_HOST;
	439	input_dev->dev.parent = &pdev->dev;
bab7614d EM	440	input_dev->open = matrix_keypad_start;
	441	input_dev->close = matrix_keypad_stop;
	442
1932811f DT	443	err = matrix_keypad_build_keymap(keymap_data, NULL,
	444	pdata->num_row_gpios,
	445	pdata->num_col_gpios,
	446	keypad->keycodes, input_dev);
	447	if (err)
	448	goto err_free_mem;
bab7614d	449
1932811f DT	450	if (!pdata->no_autorepeat)
1932811f DT	451	__set_bit(EV_REP, input_dev->evbit);
bab7614d EM	452	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	453	input_set_drvdata(input_dev, keypad);
	454
b83643eb	455	err = matrix_keypad_init_gpio(pdev, keypad);
bab7614d EM	456	if (err)
	457	goto err_free_mem;
	458
	459	err = input_register_device(keypad->input_dev);
	460	if (err)
b83643eb	461	goto err_free_gpio;
bab7614d EM	462
	463	device_init_wakeup(&pdev->dev, pdata->wakeup);
	464	platform_set_drvdata(pdev, keypad);
	465
	466	return 0;
	467
b83643eb DT	468	err_free_gpio:
b83643eb DT	469	matrix_keypad_free_gpio(keypad);
bab7614d EM	470	err_free_mem:
bab7614d EM	471	input_free_device(input_dev);
bab7614d EM	472	kfree(keypad);
	473	return err;
	474	}
	475
	476	static int __devexit matrix_keypad_remove(struct platform_device *pdev)
	477	{
	478	struct matrix_keypad *keypad = platform_get_drvdata(pdev);
bab7614d EM	479
	480	device_init_wakeup(&pdev->dev, 0);
	481
b83643eb	482	matrix_keypad_free_gpio(keypad);
bab7614d	483	input_unregister_device(keypad->input_dev);
bab7614d EM	484	kfree(keypad);
bab7614d EM	485
b83643eb DT	486	platform_set_drvdata(pdev, NULL);
b83643eb DT	487
bab7614d EM	488	return 0;
	489	}
	490
	491	static struct platform_driver matrix_keypad_driver = {
	492	.probe = matrix_keypad_probe,
	493	.remove = __devexit_p(matrix_keypad_remove),
bab7614d EM	494	.driver = {
	495	.name = "matrix-keypad",
	496	.owner = THIS_MODULE,
f72a28ab	497	.pm = &matrix_keypad_pm_ops,
bab7614d EM	498	},
bab7614d EM	499	};
5146c84f	500	module_platform_driver(matrix_keypad_driver);
bab7614d EM	501
	502	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	503	MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver");
	504	MODULE_LICENSE("GPL v2");
	505	MODULE_ALIAS("platform:matrix-keypad");