[mirror_ubuntu-eoan-kernel.git] / drivers / input / keyboard / gpio_keys_polled.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Driver for buttons on GPIO lines not capable of generating interrupts
 *
 *  Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
 *
 *  This file was based on: /drivers/input/misc/cobalt_btns.c
 *	Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  also was based on: /drivers/input/keyboard/gpio_keys.c
 *	Copyright 2005 Phil Blundell
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio_keys.h>
#include <linux/property.h>

#define DRV_NAME	"gpio-keys-polled"

struct gpio_keys_button_data {
	struct gpio_desc *gpiod;
	int last_state;
	int count;
	int threshold;
};

struct gpio_keys_polled_dev {
	struct input_polled_dev *poll_dev;
	struct device *dev;
	const struct gpio_keys_platform_data *pdata;
	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
	struct gpio_keys_button_data data[0];
};

static void gpio_keys_button_event(struct input_polled_dev *dev,
				   const struct gpio_keys_button *button,
				   int state)
{
	struct gpio_keys_polled_dev *bdev = dev->private;
	struct input_dev *input = dev->input;
	unsigned int type = button->type ?: EV_KEY;

	if (type == EV_REL) {
		if (state) {
			input_event(input, type, button->code, button->value);
			__set_bit(button->code, bdev->rel_axis_seen);
		}
	} else if (type == EV_ABS) {
		if (state) {
			input_event(input, type, button->code, button->value);
			__set_bit(button->code, bdev->abs_axis_seen);
		}
	} else {
		input_event(input, type, button->code, state);
		input_sync(input);
	}
}

static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
					 const struct gpio_keys_button *button,
					 struct gpio_keys_button_data *bdata)
{
	int state;

	state = gpiod_get_value_cansleep(bdata->gpiod);
	if (state < 0) {
		dev_err(dev->input->dev.parent,
			"failed to get gpio state: %d\n", state);
	} else {
		gpio_keys_button_event(dev, button, state);

		if (state != bdata->last_state) {
			bdata->count = 0;
			bdata->last_state = state;
		}
	}
}

static void gpio_keys_polled_poll(struct input_polled_dev *dev)
{
	struct gpio_keys_polled_dev *bdev = dev->private;
	const struct gpio_keys_platform_data *pdata = bdev->pdata;
	struct input_dev *input = dev->input;
	int i;

	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
	memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));

	for (i = 0; i < pdata->nbuttons; i++) {
		struct gpio_keys_button_data *bdata = &bdev->data[i];

		if (bdata->count < bdata->threshold) {
			bdata->count++;
			gpio_keys_button_event(dev, &pdata->buttons[i],
					       bdata->last_state);
		} else {
			gpio_keys_polled_check_state(dev, &pdata->buttons[i],
						     bdata);
		}
	}

	for_each_set_bit(i, input->relbit, REL_CNT) {
		if (!test_bit(i, bdev->rel_axis_seen))
			input_event(input, EV_REL, i, 0);
	}

	for_each_set_bit(i, input->absbit, ABS_CNT) {
		if (!test_bit(i, bdev->abs_axis_seen))
			input_event(input, EV_ABS, i, 0);
	}

	input_sync(input);
}

static void gpio_keys_polled_open(struct input_polled_dev *dev)
{
	struct gpio_keys_polled_dev *bdev = dev->private;
	const struct gpio_keys_platform_data *pdata = bdev->pdata;

	if (pdata->enable)
		pdata->enable(bdev->dev);
}

static void gpio_keys_polled_close(struct input_polled_dev *dev)
{
	struct gpio_keys_polled_dev *bdev = dev->private;
	const struct gpio_keys_platform_data *pdata = bdev->pdata;

	if (pdata->disable)
		pdata->disable(bdev->dev);
}

static struct gpio_keys_platform_data *
gpio_keys_polled_get_devtree_pdata(struct device *dev)
{
	struct gpio_keys_platform_data *pdata;
	struct gpio_keys_button *button;
	struct fwnode_handle *child;
	int nbuttons;

	nbuttons = device_get_child_node_count(dev);
	if (nbuttons == 0)
		return ERR_PTR(-EINVAL);

	pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
			     GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	button = (struct gpio_keys_button *)(pdata + 1);

	pdata->buttons = button;
	pdata->nbuttons = nbuttons;

	pdata->rep = device_property_present(dev, "autorepeat");
	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);

	device_property_read_string(dev, "label", &pdata->name);

	device_for_each_child_node(dev, child) {
		if (fwnode_property_read_u32(child, "linux,code",
					     &button->code)) {
			dev_err(dev, "button without keycode\n");
			fwnode_handle_put(child);
			return ERR_PTR(-EINVAL);
		}

		fwnode_property_read_string(child, "label", &button->desc);

		if (fwnode_property_read_u32(child, "linux,input-type",
					     &button->type))
			button->type = EV_KEY;

		if (fwnode_property_read_u32(child, "linux,input-value",
					     (u32 *)&button->value))
			button->value = 1;

		button->wakeup =
			fwnode_property_read_bool(child, "wakeup-source") ||
			/* legacy name */
			fwnode_property_read_bool(child, "gpio-key,wakeup");

		if (fwnode_property_read_u32(child, "debounce-interval",
					     &button->debounce_interval))
			button->debounce_interval = 5;

		button++;
	}

	return pdata;
}

static void gpio_keys_polled_set_abs_params(struct input_dev *input,
	const struct gpio_keys_platform_data *pdata, unsigned int code)
{
	int i, min = 0, max = 0;

	for (i = 0; i < pdata->nbuttons; i++) {
		const struct gpio_keys_button *button = &pdata->buttons[i];

		if (button->type != EV_ABS || button->code != code)
			continue;

		if (button->value < min)
			min = button->value;
		if (button->value > max)
			max = button->value;
	}

	input_set_abs_params(input, code, min, max, 0, 0);
}

static const struct of_device_id gpio_keys_polled_of_match[] = {
	{ .compatible = "gpio-keys-polled", },
	{ },
};
MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);

static int gpio_keys_polled_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct fwnode_handle *child = NULL;
	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
	struct gpio_keys_polled_dev *bdev;
	struct input_polled_dev *poll_dev;
	struct input_dev *input;
	int error;
	int i;

	if (!pdata) {
		pdata = gpio_keys_polled_get_devtree_pdata(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

	if (!pdata->poll_interval) {
		dev_err(dev, "missing poll_interval value\n");
		return -EINVAL;
	}

	bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
			    GFP_KERNEL);
	if (!bdev) {
		dev_err(dev, "no memory for private data\n");
		return -ENOMEM;
	}

	poll_dev = devm_input_allocate_polled_device(dev);
	if (!poll_dev) {
		dev_err(dev, "no memory for polled device\n");
		return -ENOMEM;
	}

	poll_dev->private = bdev;
	poll_dev->poll = gpio_keys_polled_poll;
	poll_dev->poll_interval = pdata->poll_interval;
	poll_dev->open = gpio_keys_polled_open;
	poll_dev->close = gpio_keys_polled_close;

	input = poll_dev->input;

	input->name = pdata->name ?: pdev->name;
	input->phys = DRV_NAME"/input0";

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	__set_bit(EV_KEY, input->evbit);
	if (pdata->rep)
		__set_bit(EV_REP, input->evbit);

	for (i = 0; i < pdata->nbuttons; i++) {
		const struct gpio_keys_button *button = &pdata->buttons[i];
		struct gpio_keys_button_data *bdata = &bdev->data[i];
		unsigned int type = button->type ?: EV_KEY;

		if (button->wakeup) {
			dev_err(dev, DRV_NAME " does not support wakeup\n");
			fwnode_handle_put(child);
			return -EINVAL;
		}

		if (!dev_get_platdata(dev)) {
			/* No legacy static platform data */
			child = device_get_next_child_node(dev, child);
			if (!child) {
				dev_err(dev, "missing child device node\n");
				return -EINVAL;
			}

			bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
								NULL, child,
								GPIOD_IN,
								button->desc);
			if (IS_ERR(bdata->gpiod)) {
				error = PTR_ERR(bdata->gpiod);
				if (error != -EPROBE_DEFER)
					dev_err(dev,
						"failed to get gpio: %d\n",
						error);
				fwnode_handle_put(child);
				return error;
			}
		} else if (gpio_is_valid(button->gpio)) {
			/*
			 * Legacy GPIO number so request the GPIO here and
			 * convert it to descriptor.
			 */
			unsigned flags = GPIOF_IN;

			if (button->active_low)
				flags |= GPIOF_ACTIVE_LOW;

			error = devm_gpio_request_one(dev, button->gpio,
					flags, button->desc ? : DRV_NAME);
			if (error) {
				dev_err(dev,
					"unable to claim gpio %u, err=%d\n",
					button->gpio, error);
				return error;
			}

			bdata->gpiod = gpio_to_desc(button->gpio);
			if (!bdata->gpiod) {
				dev_err(dev,
					"unable to convert gpio %u to descriptor\n",
					button->gpio);
				return -EINVAL;
			}
		}

		bdata->last_state = -1;
		bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
						pdata->poll_interval);

		input_set_capability(input, type, button->code);
		if (type == EV_ABS)
			gpio_keys_polled_set_abs_params(input, pdata,
							button->code);
	}

	fwnode_handle_put(child);

	bdev->poll_dev = poll_dev;
	bdev->dev = dev;
	bdev->pdata = pdata;

	error = input_register_polled_device(poll_dev);
	if (error) {
		dev_err(dev, "unable to register polled device, err=%d\n",
			error);
		return error;
	}

	/* report initial state of the buttons */
	for (i = 0; i < pdata->nbuttons; i++)
		gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
					     &bdev->data[i]);

	input_sync(input);

	return 0;
}

static struct platform_driver gpio_keys_polled_driver = {
	.probe	= gpio_keys_polled_probe,
	.driver	= {
		.name	= DRV_NAME,
		.of_match_table = gpio_keys_polled_of_match,
	},
};
module_platform_driver(gpio_keys_polled_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("Polled GPIO Buttons driver");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Driver for buttons on GPIO lines not capable of generating interrupts
	4	*
	5	* Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
	6	* Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
	7	*
	8	* This file was based on: /drivers/input/misc/cobalt_btns.c
	9	* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
	10	*
	11	* also was based on: /drivers/input/keyboard/gpio_keys.c
	12	* Copyright 2005 Phil Blundell
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
	18	#include <linux/input.h>
	19	#include <linux/input-polldev.h>
	20	#include <linux/ioport.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/gpio.h>
	23	#include <linux/gpio/consumer.h>
	24	#include <linux/gpio_keys.h>
	25	#include <linux/property.h>
	26
	27	#define DRV_NAME "gpio-keys-polled"
	28
	29	struct gpio_keys_button_data {
	30	struct gpio_desc *gpiod;
	31	int last_state;
	32	int count;
	33	int threshold;
	34	};
	35
	36	struct gpio_keys_polled_dev {
	37	struct input_polled_dev *poll_dev;
	38	struct device *dev;
	39	const struct gpio_keys_platform_data *pdata;
	40	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
	41	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
	42	struct gpio_keys_button_data data[0];
	43	};
	44
	45	static void gpio_keys_button_event(struct input_polled_dev *dev,
	46	const struct gpio_keys_button *button,
	47	int state)
	48	{
	49	struct gpio_keys_polled_dev *bdev = dev->private;
	50	struct input_dev *input = dev->input;
	51	unsigned int type = button->type ?: EV_KEY;
	52
	53	if (type == EV_REL) {
	54	if (state) {
	55	input_event(input, type, button->code, button->value);
	56	__set_bit(button->code, bdev->rel_axis_seen);
	57	}
	58	} else if (type == EV_ABS) {
	59	if (state) {
	60	input_event(input, type, button->code, button->value);
	61	__set_bit(button->code, bdev->abs_axis_seen);
	62	}
	63	} else {
	64	input_event(input, type, button->code, state);
	65	input_sync(input);
	66	}
	67	}
	68
	69	static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
	70	const struct gpio_keys_button *button,
	71	struct gpio_keys_button_data *bdata)
	72	{
	73	int state;
	74
	75	state = gpiod_get_value_cansleep(bdata->gpiod);
	76	if (state < 0) {
	77	dev_err(dev->input->dev.parent,
	78	"failed to get gpio state: %d\n", state);
	79	} else {
	80	gpio_keys_button_event(dev, button, state);
	81
	82	if (state != bdata->last_state) {
	83	bdata->count = 0;
	84	bdata->last_state = state;
	85	}
	86	}
	87	}
	88
	89	static void gpio_keys_polled_poll(struct input_polled_dev *dev)
	90	{
	91	struct gpio_keys_polled_dev *bdev = dev->private;
	92	const struct gpio_keys_platform_data *pdata = bdev->pdata;
	93	struct input_dev *input = dev->input;
	94	int i;
	95
	96	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
	97	memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
	98
	99	for (i = 0; i < pdata->nbuttons; i++) {
	100	struct gpio_keys_button_data *bdata = &bdev->data[i];
	101
	102	if (bdata->count < bdata->threshold) {
	103	bdata->count++;
	104	gpio_keys_button_event(dev, &pdata->buttons[i],
	105	bdata->last_state);
	106	} else {
	107	gpio_keys_polled_check_state(dev, &pdata->buttons[i],
	108	bdata);
	109	}
	110	}
	111
	112	for_each_set_bit(i, input->relbit, REL_CNT) {
	113	if (!test_bit(i, bdev->rel_axis_seen))
	114	input_event(input, EV_REL, i, 0);
	115	}
	116
	117	for_each_set_bit(i, input->absbit, ABS_CNT) {
	118	if (!test_bit(i, bdev->abs_axis_seen))
	119	input_event(input, EV_ABS, i, 0);
	120	}
	121
	122	input_sync(input);
	123	}
	124
	125	static void gpio_keys_polled_open(struct input_polled_dev *dev)
	126	{
	127	struct gpio_keys_polled_dev *bdev = dev->private;
	128	const struct gpio_keys_platform_data *pdata = bdev->pdata;
	129
	130	if (pdata->enable)
	131	pdata->enable(bdev->dev);
	132	}
	133
	134	static void gpio_keys_polled_close(struct input_polled_dev *dev)
	135	{
	136	struct gpio_keys_polled_dev *bdev = dev->private;
	137	const struct gpio_keys_platform_data *pdata = bdev->pdata;
	138
	139	if (pdata->disable)
	140	pdata->disable(bdev->dev);
	141	}
	142
	143	static struct gpio_keys_platform_data *
	144	gpio_keys_polled_get_devtree_pdata(struct device *dev)
	145	{
	146	struct gpio_keys_platform_data *pdata;
	147	struct gpio_keys_button *button;
	148	struct fwnode_handle *child;
	149	int nbuttons;
	150
	151	nbuttons = device_get_child_node_count(dev);
	152	if (nbuttons == 0)
	153	return ERR_PTR(-EINVAL);
	154
	155	pdata = devm_kzalloc(dev, sizeof(pdata) + nbuttons sizeof(*button),
	156	GFP_KERNEL);
	157	if (!pdata)
	158	return ERR_PTR(-ENOMEM);
	159
	160	button = (struct gpio_keys_button *)(pdata + 1);
	161
	162	pdata->buttons = button;
	163	pdata->nbuttons = nbuttons;
	164
	165	pdata->rep = device_property_present(dev, "autorepeat");
	166	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
	167
	168	device_property_read_string(dev, "label", &pdata->name);
	169
	170	device_for_each_child_node(dev, child) {
	171	if (fwnode_property_read_u32(child, "linux,code",
	172	&button->code)) {
	173	dev_err(dev, "button without keycode\n");
	174	fwnode_handle_put(child);
	175	return ERR_PTR(-EINVAL);
	176	}
	177
	178	fwnode_property_read_string(child, "label", &button->desc);
	179
	180	if (fwnode_property_read_u32(child, "linux,input-type",
	181	&button->type))
	182	button->type = EV_KEY;
	183
	184	if (fwnode_property_read_u32(child, "linux,input-value",
	185	(u32 *)&button->value))
	186	button->value = 1;
	187
	188	button->wakeup =
	189	fwnode_property_read_bool(child, "wakeup-source") \|\|
	190	/* legacy name */
	191	fwnode_property_read_bool(child, "gpio-key,wakeup");
	192
	193	if (fwnode_property_read_u32(child, "debounce-interval",
	194	&button->debounce_interval))
	195	button->debounce_interval = 5;
	196
	197	button++;
	198	}
	199
	200	return pdata;
	201	}
	202
	203	static void gpio_keys_polled_set_abs_params(struct input_dev *input,
	204	const struct gpio_keys_platform_data *pdata, unsigned int code)
	205	{
	206	int i, min = 0, max = 0;
	207
	208	for (i = 0; i < pdata->nbuttons; i++) {
	209	const struct gpio_keys_button *button = &pdata->buttons[i];
	210
	211	if (button->type != EV_ABS \|\| button->code != code)
	212	continue;
	213
	214	if (button->value < min)
	215	min = button->value;
	216	if (button->value > max)
	217	max = button->value;
	218	}
	219
	220	input_set_abs_params(input, code, min, max, 0, 0);
	221	}
	222
	223	static const struct of_device_id gpio_keys_polled_of_match[] = {
	224	{ .compatible = "gpio-keys-polled", },
	225	{ },
	226	};
	227	MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
	228
	229	static int gpio_keys_polled_probe(struct platform_device *pdev)
	230	{
	231	struct device *dev = &pdev->dev;
	232	struct fwnode_handle *child = NULL;
	233	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
	234	struct gpio_keys_polled_dev *bdev;
	235	struct input_polled_dev *poll_dev;
	236	struct input_dev *input;
	237	int error;
	238	int i;
	239
	240	if (!pdata) {
	241	pdata = gpio_keys_polled_get_devtree_pdata(dev);
	242	if (IS_ERR(pdata))
	243	return PTR_ERR(pdata);
	244	}
	245
	246	if (!pdata->poll_interval) {
	247	dev_err(dev, "missing poll_interval value\n");
	248	return -EINVAL;
	249	}
	250
	251	bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
	252	GFP_KERNEL);
	253	if (!bdev) {
	254	dev_err(dev, "no memory for private data\n");
	255	return -ENOMEM;
	256	}
	257
	258	poll_dev = devm_input_allocate_polled_device(dev);
	259	if (!poll_dev) {
	260	dev_err(dev, "no memory for polled device\n");
	261	return -ENOMEM;
	262	}
	263
	264	poll_dev->private = bdev;
	265	poll_dev->poll = gpio_keys_polled_poll;
	266	poll_dev->poll_interval = pdata->poll_interval;
	267	poll_dev->open = gpio_keys_polled_open;
	268	poll_dev->close = gpio_keys_polled_close;
	269
	270	input = poll_dev->input;
	271
	272	input->name = pdata->name ?: pdev->name;
	273	input->phys = DRV_NAME"/input0";
	274
	275	input->id.bustype = BUS_HOST;
	276	input->id.vendor = 0x0001;
	277	input->id.product = 0x0001;
	278	input->id.version = 0x0100;
	279
	280	__set_bit(EV_KEY, input->evbit);
	281	if (pdata->rep)
	282	__set_bit(EV_REP, input->evbit);
	283
	284	for (i = 0; i < pdata->nbuttons; i++) {
	285	const struct gpio_keys_button *button = &pdata->buttons[i];
	286	struct gpio_keys_button_data *bdata = &bdev->data[i];
	287	unsigned int type = button->type ?: EV_KEY;
	288
	289	if (button->wakeup) {
	290	dev_err(dev, DRV_NAME " does not support wakeup\n");
	291	fwnode_handle_put(child);
	292	return -EINVAL;
	293	}
	294
	295	if (!dev_get_platdata(dev)) {
	296	/* No legacy static platform data */
	297	child = device_get_next_child_node(dev, child);
	298	if (!child) {
	299	dev_err(dev, "missing child device node\n");
	300	return -EINVAL;
	301	}
	302
	303	bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
	304	NULL, child,
	305	GPIOD_IN,
	306	button->desc);
	307	if (IS_ERR(bdata->gpiod)) {
	308	error = PTR_ERR(bdata->gpiod);
	309	if (error != -EPROBE_DEFER)
	310	dev_err(dev,
	311	"failed to get gpio: %d\n",
	312	error);
	313	fwnode_handle_put(child);
	314	return error;
	315	}
	316	} else if (gpio_is_valid(button->gpio)) {
	317	/*
	318	* Legacy GPIO number so request the GPIO here and
	319	* convert it to descriptor.
	320	*/
	321	unsigned flags = GPIOF_IN;
	322
	323	if (button->active_low)
	324	flags \|= GPIOF_ACTIVE_LOW;
	325
	326	error = devm_gpio_request_one(dev, button->gpio,
	327	flags, button->desc ? : DRV_NAME);
	328	if (error) {
	329	dev_err(dev,
	330	"unable to claim gpio %u, err=%d\n",
	331	button->gpio, error);
	332	return error;
	333	}
	334
	335	bdata->gpiod = gpio_to_desc(button->gpio);
	336	if (!bdata->gpiod) {
	337	dev_err(dev,
	338	"unable to convert gpio %u to descriptor\n",
	339	button->gpio);
	340	return -EINVAL;
	341	}
	342	}
	343
	344	bdata->last_state = -1;
	345	bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
	346	pdata->poll_interval);
	347
	348	input_set_capability(input, type, button->code);
	349	if (type == EV_ABS)
	350	gpio_keys_polled_set_abs_params(input, pdata,
	351	button->code);
	352	}
	353
	354	fwnode_handle_put(child);
	355
	356	bdev->poll_dev = poll_dev;
	357	bdev->dev = dev;
	358	bdev->pdata = pdata;
	359
	360	error = input_register_polled_device(poll_dev);
	361	if (error) {
	362	dev_err(dev, "unable to register polled device, err=%d\n",
	363	error);
	364	return error;
	365	}
	366
	367	/* report initial state of the buttons */
	368	for (i = 0; i < pdata->nbuttons; i++)
	369	gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
	370	&bdev->data[i]);
	371
	372	input_sync(input);
	373
	374	return 0;
	375	}
	376
	377	static struct platform_driver gpio_keys_polled_driver = {
	378	.probe = gpio_keys_polled_probe,
	379	.driver = {
	380	.name = DRV_NAME,
	381	.of_match_table = gpio_keys_polled_of_match,
	382	},
	383	};
	384	module_platform_driver(gpio_keys_polled_driver);
	385
	386	MODULE_LICENSE("GPL v2");
	387	MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
	388	MODULE_DESCRIPTION("Polled GPIO Buttons driver");
	389	MODULE_ALIAS("platform:" DRV_NAME);