[linux-2.6-block.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/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_dev *input;
	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[];
};

static void gpio_keys_button_event(struct input_dev *input,
				   const struct gpio_keys_button *button,
				   int state)
{
	struct gpio_keys_polled_dev *bdev = input_get_drvdata(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_dev *input,
					 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(input->dev.parent,
			"failed to get gpio state: %d\n", state);
	} else {
		gpio_keys_button_event(input, button, state);

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

static void gpio_keys_polled_poll(struct input_dev *input)
{
	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
	const struct gpio_keys_platform_data *pdata = bdev->pdata;
	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(input, &pdata->buttons[i],
					       bdata->last_state);
		} else {
			gpio_keys_polled_check_state(input, &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 int gpio_keys_polled_open(struct input_dev *input)
{
	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
	const struct gpio_keys_platform_data *pdata = bdev->pdata;

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

	return 0;
}

static void gpio_keys_polled_close(struct input_dev *input)
{
	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
	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_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;
	}

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

	input_set_drvdata(input, bdev);

	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;

	input->open = gpio_keys_polled_open;
	input->close = gpio_keys_polled_close;

	__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_gpiod_get(dev, child,
							     NULL, 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->input = input;
	bdev->dev = dev;
	bdev->pdata = pdata;

	error = input_setup_polling(input, gpio_keys_polled_poll);
	if (error) {
		dev_err(dev, "unable to set up polling, err=%d\n", error);
		return error;
	}

	input_set_poll_interval(input, pdata->poll_interval);

	error = input_register_device(input);
	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(input, &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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
0e7d0c86 GJ	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
0e7d0c86 GJ	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
0e7d0c86 GJ	17	#include <linux/slab.h>
0e7d0c86 GJ	18	#include <linux/input.h>
0e7d0c86 GJ	19	#include <linux/ioport.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/gpio.h>
633a21d8	22	#include <linux/gpio/consumer.h>
0e7d0c86	23	#include <linux/gpio_keys.h>
b26d4e22	24	#include <linux/property.h>
0e7d0c86 GJ	25
	26	#define DRV_NAME "gpio-keys-polled"
	27
	28	struct gpio_keys_button_data {
0f78ba96	29	struct gpio_desc *gpiod;
0e7d0c86 GJ	30	int last_state;
	31	int count;
	32	int threshold;
0e7d0c86 GJ	33	};
	34
	35	struct gpio_keys_polled_dev {
9584bded	36	struct input_dev *input;
0e7d0c86	37	struct device *dev;
2976f247	38	const struct gpio_keys_platform_data *pdata;
6f29d3b2 HG	39	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
6f29d3b2 HG	40	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
3d87c75d	41	struct gpio_keys_button_data data[];
0e7d0c86 GJ	42	};
0e7d0c86 GJ	43
9584bded	44	static void gpio_keys_button_event(struct input_dev *input,
0f78ba96	45	const struct gpio_keys_button *button,
6f29d3b2 HG	46	int state)
6f29d3b2 HG	47	{
9584bded	48	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
6f29d3b2 HG	49	unsigned int type = button->type ?: EV_KEY;
	50
	51	if (type == EV_REL) {
	52	if (state) {
	53	input_event(input, type, button->code, button->value);
	54	__set_bit(button->code, bdev->rel_axis_seen);
	55	}
	56	} else if (type == EV_ABS) {
	57	if (state) {
	58	input_event(input, type, button->code, button->value);
	59	__set_bit(button->code, bdev->abs_axis_seen);
	60	}
	61	} else {
	62	input_event(input, type, button->code, state);
	63	input_sync(input);
	64	}
	65	}
	66
9584bded	67	static void gpio_keys_polled_check_state(struct input_dev *input,
0f78ba96	68	const struct gpio_keys_button *button,
0e7d0c86 GJ	69	struct gpio_keys_button_data *bdata)
	70	{
	71	int state;
	72
ea6aabf8 DT	73	state = gpiod_get_value_cansleep(bdata->gpiod);
ea6aabf8 DT	74	if (state < 0) {
9584bded	75	dev_err(input->dev.parent,
ea6aabf8 DT	76	"failed to get gpio state: %d\n", state);
ea6aabf8 DT	77	} else {
9584bded	78	gpio_keys_button_event(input, button, state);
0e7d0c86	79
ea6aabf8 DT	80	if (state != bdata->last_state) {
	81	bdata->count = 0;
	82	bdata->last_state = state;
	83	}
0e7d0c86 GJ	84	}
	85	}
	86
9584bded	87	static void gpio_keys_polled_poll(struct input_dev *input)
0e7d0c86	88	{
9584bded	89	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
2976f247	90	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	91	int i;
0e7d0c86 GJ	92
6f29d3b2 HG	93	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
	94	memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
	95
2976f247	96	for (i = 0; i < pdata->nbuttons; i++) {
0e7d0c86 GJ	97	struct gpio_keys_button_data *bdata = &bdev->data[i];
0e7d0c86 GJ	98
6f29d3b2	99	if (bdata->count < bdata->threshold) {
0e7d0c86	100	bdata->count++;
9584bded	101	gpio_keys_button_event(input, &pdata->buttons[i],
6f29d3b2 HG	102	bdata->last_state);
6f29d3b2 HG	103	} else {
9584bded	104	gpio_keys_polled_check_state(input, &pdata->buttons[i],
0e7d0c86	105	bdata);
6f29d3b2 HG	106	}
	107	}
	108
	109	for_each_set_bit(i, input->relbit, REL_CNT) {
	110	if (!test_bit(i, bdev->rel_axis_seen))
	111	input_event(input, EV_REL, i, 0);
	112	}
	113
	114	for_each_set_bit(i, input->absbit, ABS_CNT) {
	115	if (!test_bit(i, bdev->abs_axis_seen))
	116	input_event(input, EV_ABS, i, 0);
0e7d0c86	117	}
6f29d3b2 HG	118
6f29d3b2 HG	119	input_sync(input);
0e7d0c86 GJ	120	}
0e7d0c86 GJ	121
9584bded	122	static int gpio_keys_polled_open(struct input_dev *input)
0e7d0c86	123	{
9584bded	124	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
2976f247	125	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	126
	127	if (pdata->enable)
	128	pdata->enable(bdev->dev);
9584bded DT	129
9584bded DT	130	return 0;
0e7d0c86 GJ	131	}
0e7d0c86 GJ	132
9584bded	133	static void gpio_keys_polled_close(struct input_dev *input)
0e7d0c86	134	{
9584bded	135	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
2976f247	136	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	137
	138	if (pdata->disable)
	139	pdata->disable(bdev->dev);
	140	}
	141
0f78ba96 DT	142	static struct gpio_keys_platform_data *
0f78ba96 DT	143	gpio_keys_polled_get_devtree_pdata(struct device *dev)
a2f25245	144	{
a2f25245 APS	145	struct gpio_keys_platform_data *pdata;
a2f25245 APS	146	struct gpio_keys_button *button;
b26d4e22	147	struct fwnode_handle *child;
a2f25245	148	int nbuttons;
a2f25245	149
b26d4e22	150	nbuttons = device_get_child_node_count(dev);
a2f25245	151	if (nbuttons == 0)
0f78ba96	152	return ERR_PTR(-EINVAL);
a2f25245	153
68252638 AS	154	pdata = devm_kzalloc(dev, sizeof(pdata) + nbuttons sizeof(*button),
	155	GFP_KERNEL);
	156	if (!pdata)
	157	return ERR_PTR(-ENOMEM);
a2f25245	158
0f78ba96 DT	159	button = (struct gpio_keys_button *)(pdata + 1);
	160
	161	pdata->buttons = button;
	162	pdata->nbuttons = nbuttons;
a2f25245	163
b26d4e22 AL	164	pdata->rep = device_property_present(dev, "autorepeat");
b26d4e22 AL	165	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
a2f25245	166
593fdd4f EWI	167	device_property_read_string(dev, "label", &pdata->name);
593fdd4f EWI	168
b26d4e22	169	device_for_each_child_node(dev, child) {
0f78ba96 DT	170	if (fwnode_property_read_u32(child, "linux,code",
	171	&button->code)) {
	172	dev_err(dev, "button without keycode\n");
b26d4e22	173	fwnode_handle_put(child);
68252638	174	return ERR_PTR(-EINVAL);
a2f25245 APS	175	}
a2f25245 APS	176
b26d4e22	177	fwnode_property_read_string(child, "label", &button->desc);
a2f25245	178
b26d4e22 AL	179	if (fwnode_property_read_u32(child, "linux,input-type",
b26d4e22 AL	180	&button->type))
a2f25245 APS	181	button->type = EV_KEY;
a2f25245 APS	182
6f29d3b2 HG	183	if (fwnode_property_read_u32(child, "linux,input-value",
	184	(u32 *)&button->value))
	185	button->value = 1;
	186
99b4ffbd DT	187	button->wakeup =
	188	fwnode_property_read_bool(child, "wakeup-source") \|\|
	189	/* legacy name */
	190	fwnode_property_read_bool(child, "gpio-key,wakeup");
a2f25245	191
b26d4e22 AL	192	if (fwnode_property_read_u32(child, "debounce-interval",
b26d4e22 AL	193	&button->debounce_interval))
a2f25245	194	button->debounce_interval = 5;
a2f25245	195
0f78ba96 DT	196	button++;
0f78ba96 DT	197	}
a2f25245 APS	198
a2f25245 APS	199	return pdata;
a2f25245 APS	200	}
a2f25245 APS	201
6f29d3b2 HG	202	static void gpio_keys_polled_set_abs_params(struct input_dev *input,
	203	const struct gpio_keys_platform_data *pdata, unsigned int code)
	204	{
	205	int i, min = 0, max = 0;
	206
	207	for (i = 0; i < pdata->nbuttons; i++) {
0f78ba96	208	const struct gpio_keys_button *button = &pdata->buttons[i];
6f29d3b2 HG	209
	210	if (button->type != EV_ABS \|\| button->code != code)
	211	continue;
	212
	213	if (button->value < min)
	214	min = button->value;
	215	if (button->value > max)
	216	max = button->value;
	217	}
0f78ba96	218
6f29d3b2 HG	219	input_set_abs_params(input, code, min, max, 0, 0);
	220	}
	221
90c98ef5	222	static const struct of_device_id gpio_keys_polled_of_match[] = {
a2f25245 APS	223	{ .compatible = "gpio-keys-polled", },
	224	{ },
	225	};
	226	MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
	227
5298cc4c	228	static int gpio_keys_polled_probe(struct platform_device *pdev)
0e7d0c86	229	{
0e7d0c86	230	struct device *dev = &pdev->dev;
0f78ba96	231	struct fwnode_handle *child = NULL;
2976f247	232	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
0e7d0c86	233	struct gpio_keys_polled_dev *bdev;
0e7d0c86 GJ	234	struct input_dev *input;
	235	int error;
	236	int i;
	237
a2f25245 APS	238	if (!pdata) {
	239	pdata = gpio_keys_polled_get_devtree_pdata(dev);
	240	if (IS_ERR(pdata))
	241	return PTR_ERR(pdata);
a2f25245 APS	242	}
	243
	244	if (!pdata->poll_interval) {
	245	dev_err(dev, "missing poll_interval value\n");
68252638	246	return -EINVAL;
a2f25245	247	}
0e7d0c86	248
3d4149ec GS	249	bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
3d4149ec GS	250	GFP_KERNEL);
0e7d0c86 GJ	251	if (!bdev) {
0e7d0c86 GJ	252	dev_err(dev, "no memory for private data\n");
68252638	253	return -ENOMEM;
0e7d0c86 GJ	254	}
0e7d0c86 GJ	255
9584bded DT	256	input = devm_input_allocate_device(dev);
	257	if (!input) {
	258	dev_err(dev, "no memory for input device\n");
68252638	259	return -ENOMEM;
0e7d0c86 GJ	260	}
0e7d0c86 GJ	261
9584bded	262	input_set_drvdata(input, bdev);
0e7d0c86	263
593fdd4f	264	input->name = pdata->name ?: pdev->name;
0e7d0c86	265	input->phys = DRV_NAME"/input0";
0e7d0c86 GJ	266
	267	input->id.bustype = BUS_HOST;
	268	input->id.vendor = 0x0001;
	269	input->id.product = 0x0001;
	270	input->id.version = 0x0100;
	271
9584bded DT	272	input->open = gpio_keys_polled_open;
	273	input->close = gpio_keys_polled_close;
	274
1a22e16f AS	275	__set_bit(EV_KEY, input->evbit);
	276	if (pdata->rep)
	277	__set_bit(EV_REP, input->evbit);
	278
0e7d0c86	279	for (i = 0; i < pdata->nbuttons; i++) {
0f78ba96	280	const struct gpio_keys_button *button = &pdata->buttons[i];
0e7d0c86	281	struct gpio_keys_button_data *bdata = &bdev->data[i];
0e7d0c86 GJ	282	unsigned int type = button->type ?: EV_KEY;
	283
	284	if (button->wakeup) {
	285	dev_err(dev, DRV_NAME " does not support wakeup\n");
0f78ba96	286	fwnode_handle_put(child);
68252638	287	return -EINVAL;
0e7d0c86 GJ	288	}
0e7d0c86 GJ	289
0f78ba96 DT	290	if (!dev_get_platdata(dev)) {
	291	/* No legacy static platform data */
	292	child = device_get_next_child_node(dev, child);
	293	if (!child) {
	294	dev_err(dev, "missing child device node\n");
	295	return -EINVAL;
	296	}
	297
5f92dcee DT	298	bdata->gpiod = devm_fwnode_gpiod_get(dev, child,
	299	NULL, GPIOD_IN,
	300	button->desc);
0f78ba96 DT	301	if (IS_ERR(bdata->gpiod)) {
	302	error = PTR_ERR(bdata->gpiod);
	303	if (error != -EPROBE_DEFER)
	304	dev_err(dev,
	305	"failed to get gpio: %d\n",
	306	error);
	307	fwnode_handle_put(child);
	308	return error;
	309	}
	310	} else if (gpio_is_valid(button->gpio)) {
	311	/*
	312	* Legacy GPIO number so request the GPIO here and
	313	* convert it to descriptor.
	314	*/
1ae5ddb6	315	unsigned flags = GPIOF_IN;
633a21d8 AL	316
	317	if (button->active_low)
	318	flags \|= GPIOF_ACTIVE_LOW;
	319
b4e66e7d	320	error = devm_gpio_request_one(dev, button->gpio,
633a21d8 AL	321	flags, button->desc ? : DRV_NAME);
633a21d8 AL	322	if (error) {
0f78ba96 DT	323	dev_err(dev,
0f78ba96 DT	324	"unable to claim gpio %u, err=%d\n",
633a21d8 AL	325	button->gpio, error);
	326	return error;
	327	}
	328
0f78ba96 DT	329	bdata->gpiod = gpio_to_desc(button->gpio);
	330	if (!bdata->gpiod) {
	331	dev_err(dev,
	332	"unable to convert gpio %u to descriptor\n",
	333	button->gpio);
	334	return -EINVAL;
	335	}
0e7d0c86	336	}
0e7d0c86	337
0e7d0c86 GJ	338	bdata->last_state = -1;
	339	bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
	340	pdata->poll_interval);
	341
	342	input_set_capability(input, type, button->code);
6f29d3b2 HG	343	if (type == EV_ABS)
	344	gpio_keys_polled_set_abs_params(input, pdata,
	345	button->code);
0e7d0c86 GJ	346	}
0e7d0c86 GJ	347
0f78ba96 DT	348	fwnode_handle_put(child);
0f78ba96 DT	349
9584bded	350	bdev->input = input;
0e7d0c86 GJ	351	bdev->dev = dev;
0e7d0c86 GJ	352	bdev->pdata = pdata;
0e7d0c86	353
9584bded DT	354	error = input_setup_polling(input, gpio_keys_polled_poll);
	355	if (error) {
	356	dev_err(dev, "unable to set up polling, err=%d\n", error);
	357	return error;
	358	}
	359
	360	input_set_poll_interval(input, pdata->poll_interval);
	361
	362	error = input_register_device(input);
0e7d0c86 GJ	363	if (error) {
	364	dev_err(dev, "unable to register polled device, err=%d\n",
	365	error);
68252638	366	return error;
0e7d0c86 GJ	367	}
	368
	369	/* report initial state of the buttons */
	370	for (i = 0; i < pdata->nbuttons; i++)
9584bded	371	gpio_keys_polled_check_state(input, &pdata->buttons[i],
a2f25245	372	&bdev->data[i]);
0e7d0c86	373
6f29d3b2 HG	374	input_sync(input);
6f29d3b2 HG	375
0e7d0c86	376	return 0;
0e7d0c86 GJ	377	}
	378
	379	static struct platform_driver gpio_keys_polled_driver = {
	380	.probe = gpio_keys_polled_probe,
0e7d0c86 GJ	381	.driver = {
0e7d0c86 GJ	382	.name = DRV_NAME,
b26d4e22	383	.of_match_table = gpio_keys_polled_of_match,
0e7d0c86 GJ	384	},
0e7d0c86 GJ	385	};
5146c84f	386	module_platform_driver(gpio_keys_polled_driver);
0e7d0c86 GJ	387
	388	MODULE_LICENSE("GPL v2");
	389	MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
	390	MODULE_DESCRIPTION("Polled GPIO Buttons driver");
	391	MODULE_ALIAS("platform:" DRV_NAME);