[linux-2.6-block.git] / drivers / input / keyboard / gpio_keys_polled.c

/*
 *  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
 *
 *  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/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_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;
	size_t size;
	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;
	}

	size = sizeof(struct gpio_keys_polled_dev) +
			pdata->nbuttons * sizeof(struct gpio_keys_button_data);
	bdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!bdev) {
		dev_err(dev, "no memory for private data\n");
		return -ENOMEM;
	}

	poll_dev = devm_input_allocate_polled_device(&pdev->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 = 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_get_gpiod_from_child(dev, NULL,
								 child);
			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;
			}

			error = gpiod_direction_input(bdata->gpiod);
			if (error) {
				dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
					desc_to_gpio(bdata->gpiod), 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(&pdev->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
0e7d0c86 GJ	1	/*
	2	* Driver for buttons on GPIO lines not capable of generating interrupts
	3	*
	4	* Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
	5	* Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
	6	*
	7	* This file was based on: /drivers/input/misc/cobalt_btns.c
	8	* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
	9	*
	10	* also was based on: /drivers/input/keyboard/gpio_keys.c
	11	* Copyright 2005 Phil Blundell
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License version 2 as
	15	* published by the Free Software Foundation.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
0e7d0c86 GJ	20	#include <linux/slab.h>
	21	#include <linux/input.h>
	22	#include <linux/input-polldev.h>
	23	#include <linux/ioport.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/gpio.h>
633a21d8	26	#include <linux/gpio/consumer.h>
0e7d0c86	27	#include <linux/gpio_keys.h>
b26d4e22	28	#include <linux/property.h>
0e7d0c86 GJ	29
	30	#define DRV_NAME "gpio-keys-polled"
	31
	32	struct gpio_keys_button_data {
0f78ba96	33	struct gpio_desc *gpiod;
0e7d0c86 GJ	34	int last_state;
	35	int count;
	36	int threshold;
0e7d0c86 GJ	37	};
	38
	39	struct gpio_keys_polled_dev {
	40	struct input_polled_dev *poll_dev;
	41	struct device *dev;
2976f247	42	const struct gpio_keys_platform_data *pdata;
6f29d3b2 HG	43	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
6f29d3b2 HG	44	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
0e7d0c86 GJ	45	struct gpio_keys_button_data data[0];
	46	};
	47
6f29d3b2	48	static void gpio_keys_button_event(struct input_polled_dev *dev,
0f78ba96	49	const struct gpio_keys_button *button,
6f29d3b2 HG	50	int state)
	51	{
	52	struct gpio_keys_polled_dev *bdev = dev->private;
	53	struct input_dev *input = dev->input;
	54	unsigned int type = button->type ?: EV_KEY;
	55
	56	if (type == EV_REL) {
	57	if (state) {
	58	input_event(input, type, button->code, button->value);
	59	__set_bit(button->code, bdev->rel_axis_seen);
	60	}
	61	} else if (type == EV_ABS) {
	62	if (state) {
	63	input_event(input, type, button->code, button->value);
	64	__set_bit(button->code, bdev->abs_axis_seen);
	65	}
	66	} else {
	67	input_event(input, type, button->code, state);
	68	input_sync(input);
	69	}
	70	}
	71
	72	static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
0f78ba96	73	const struct gpio_keys_button *button,
0e7d0c86 GJ	74	struct gpio_keys_button_data *bdata)
	75	{
	76	int state;
	77
ea6aabf8 DT	78	state = gpiod_get_value_cansleep(bdata->gpiod);
	79	if (state < 0) {
	80	dev_err(dev->input->dev.parent,
	81	"failed to get gpio state: %d\n", state);
	82	} else {
	83	gpio_keys_button_event(dev, button, state);
0e7d0c86	84
ea6aabf8 DT	85	if (state != bdata->last_state) {
	86	bdata->count = 0;
	87	bdata->last_state = state;
	88	}
0e7d0c86 GJ	89	}
	90	}
	91
	92	static void gpio_keys_polled_poll(struct input_polled_dev *dev)
	93	{
	94	struct gpio_keys_polled_dev *bdev = dev->private;
2976f247	95	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	96	struct input_dev *input = dev->input;
	97	int i;
	98
6f29d3b2 HG	99	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
	100	memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
	101
2976f247	102	for (i = 0; i < pdata->nbuttons; i++) {
0e7d0c86 GJ	103	struct gpio_keys_button_data *bdata = &bdev->data[i];
0e7d0c86 GJ	104
6f29d3b2	105	if (bdata->count < bdata->threshold) {
0e7d0c86	106	bdata->count++;
6f29d3b2 HG	107	gpio_keys_button_event(dev, &pdata->buttons[i],
	108	bdata->last_state);
	109	} else {
	110	gpio_keys_polled_check_state(dev, &pdata->buttons[i],
0e7d0c86	111	bdata);
6f29d3b2 HG	112	}
	113	}
	114
	115	for_each_set_bit(i, input->relbit, REL_CNT) {
	116	if (!test_bit(i, bdev->rel_axis_seen))
	117	input_event(input, EV_REL, i, 0);
	118	}
	119
	120	for_each_set_bit(i, input->absbit, ABS_CNT) {
	121	if (!test_bit(i, bdev->abs_axis_seen))
	122	input_event(input, EV_ABS, i, 0);
0e7d0c86	123	}
6f29d3b2 HG	124
6f29d3b2 HG	125	input_sync(input);
0e7d0c86 GJ	126	}
	127
	128	static void gpio_keys_polled_open(struct input_polled_dev *dev)
	129	{
	130	struct gpio_keys_polled_dev *bdev = dev->private;
2976f247	131	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	132
	133	if (pdata->enable)
	134	pdata->enable(bdev->dev);
	135	}
	136
	137	static void gpio_keys_polled_close(struct input_polled_dev *dev)
	138	{
	139	struct gpio_keys_polled_dev *bdev = dev->private;
2976f247	140	const struct gpio_keys_platform_data *pdata = bdev->pdata;
0e7d0c86 GJ	141
	142	if (pdata->disable)
	143	pdata->disable(bdev->dev);
	144	}
	145
0f78ba96 DT	146	static struct gpio_keys_platform_data *
0f78ba96 DT	147	gpio_keys_polled_get_devtree_pdata(struct device *dev)
a2f25245	148	{
a2f25245 APS	149	struct gpio_keys_platform_data *pdata;
a2f25245 APS	150	struct gpio_keys_button *button;
b26d4e22	151	struct fwnode_handle *child;
a2f25245	152	int nbuttons;
a2f25245	153
b26d4e22	154	nbuttons = device_get_child_node_count(dev);
a2f25245	155	if (nbuttons == 0)
0f78ba96	156	return ERR_PTR(-EINVAL);
a2f25245	157
68252638 AS	158	pdata = devm_kzalloc(dev, sizeof(pdata) + nbuttons sizeof(*button),
	159	GFP_KERNEL);
	160	if (!pdata)
	161	return ERR_PTR(-ENOMEM);
a2f25245	162
0f78ba96 DT	163	button = (struct gpio_keys_button *)(pdata + 1);
	164
	165	pdata->buttons = button;
	166	pdata->nbuttons = nbuttons;
a2f25245	167
b26d4e22 AL	168	pdata->rep = device_property_present(dev, "autorepeat");
b26d4e22 AL	169	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
a2f25245	170
b26d4e22	171	device_for_each_child_node(dev, child) {
0f78ba96 DT	172	if (fwnode_property_read_u32(child, "linux,code",
	173	&button->code)) {
	174	dev_err(dev, "button without keycode\n");
b26d4e22	175	fwnode_handle_put(child);
68252638	176	return ERR_PTR(-EINVAL);
a2f25245 APS	177	}
a2f25245 APS	178
b26d4e22	179	fwnode_property_read_string(child, "label", &button->desc);
a2f25245	180
b26d4e22 AL	181	if (fwnode_property_read_u32(child, "linux,input-type",
b26d4e22 AL	182	&button->type))
a2f25245 APS	183	button->type = EV_KEY;
a2f25245 APS	184
6f29d3b2 HG	185	if (fwnode_property_read_u32(child, "linux,input-value",
	186	(u32 *)&button->value))
	187	button->value = 1;
	188
99b4ffbd DT	189	button->wakeup =
	190	fwnode_property_read_bool(child, "wakeup-source") \|\|
	191	/* legacy name */
	192	fwnode_property_read_bool(child, "gpio-key,wakeup");
a2f25245	193
b26d4e22 AL	194	if (fwnode_property_read_u32(child, "debounce-interval",
b26d4e22 AL	195	&button->debounce_interval))
a2f25245	196	button->debounce_interval = 5;
a2f25245	197
0f78ba96 DT	198	button++;
0f78ba96 DT	199	}
a2f25245 APS	200
a2f25245 APS	201	return pdata;
a2f25245 APS	202	}
a2f25245 APS	203
6f29d3b2 HG	204	static void gpio_keys_polled_set_abs_params(struct input_dev *input,
	205	const struct gpio_keys_platform_data *pdata, unsigned int code)
	206	{
	207	int i, min = 0, max = 0;
	208
	209	for (i = 0; i < pdata->nbuttons; i++) {
0f78ba96	210	const struct gpio_keys_button *button = &pdata->buttons[i];
6f29d3b2 HG	211
	212	if (button->type != EV_ABS \|\| button->code != code)
	213	continue;
	214
	215	if (button->value < min)
	216	min = button->value;
	217	if (button->value > max)
	218	max = button->value;
	219	}
0f78ba96	220
6f29d3b2 HG	221	input_set_abs_params(input, code, min, max, 0, 0);
	222	}
	223
90c98ef5	224	static const struct of_device_id gpio_keys_polled_of_match[] = {
a2f25245 APS	225	{ .compatible = "gpio-keys-polled", },
	226	{ },
	227	};
	228	MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
	229
5298cc4c	230	static int gpio_keys_polled_probe(struct platform_device *pdev)
0e7d0c86	231	{
0e7d0c86	232	struct device *dev = &pdev->dev;
0f78ba96	233	struct fwnode_handle *child = NULL;
2976f247	234	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
0e7d0c86 GJ	235	struct gpio_keys_polled_dev *bdev;
	236	struct input_polled_dev *poll_dev;
	237	struct input_dev *input;
68252638	238	size_t size;
0e7d0c86 GJ	239	int error;
	240	int i;
	241
a2f25245 APS	242	if (!pdata) {
	243	pdata = gpio_keys_polled_get_devtree_pdata(dev);
	244	if (IS_ERR(pdata))
	245	return PTR_ERR(pdata);
a2f25245 APS	246	}
	247
	248	if (!pdata->poll_interval) {
	249	dev_err(dev, "missing poll_interval value\n");
68252638	250	return -EINVAL;
a2f25245	251	}
0e7d0c86	252
68252638 AS	253	size = sizeof(struct gpio_keys_polled_dev) +
	254	pdata->nbuttons * sizeof(struct gpio_keys_button_data);
	255	bdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
0e7d0c86 GJ	256	if (!bdev) {
0e7d0c86 GJ	257	dev_err(dev, "no memory for private data\n");
68252638	258	return -ENOMEM;
0e7d0c86 GJ	259	}
0e7d0c86 GJ	260
68252638	261	poll_dev = devm_input_allocate_polled_device(&pdev->dev);
0e7d0c86 GJ	262	if (!poll_dev) {
0e7d0c86 GJ	263	dev_err(dev, "no memory for polled device\n");
68252638	264	return -ENOMEM;
0e7d0c86 GJ	265	}
	266
	267	poll_dev->private = bdev;
	268	poll_dev->poll = gpio_keys_polled_poll;
	269	poll_dev->poll_interval = pdata->poll_interval;
	270	poll_dev->open = gpio_keys_polled_open;
	271	poll_dev->close = gpio_keys_polled_close;
	272
	273	input = poll_dev->input;
	274
0e7d0c86 GJ	275	input->name = pdev->name;
0e7d0c86 GJ	276	input->phys = DRV_NAME"/input0";
0e7d0c86 GJ	277
	278	input->id.bustype = BUS_HOST;
	279	input->id.vendor = 0x0001;
	280	input->id.product = 0x0001;
	281	input->id.version = 0x0100;
	282
1a22e16f AS	283	__set_bit(EV_KEY, input->evbit);
	284	if (pdata->rep)
	285	__set_bit(EV_REP, input->evbit);
	286
0e7d0c86	287	for (i = 0; i < pdata->nbuttons; i++) {
0f78ba96	288	const struct gpio_keys_button *button = &pdata->buttons[i];
0e7d0c86	289	struct gpio_keys_button_data *bdata = &bdev->data[i];
0e7d0c86 GJ	290	unsigned int type = button->type ?: EV_KEY;
	291
	292	if (button->wakeup) {
	293	dev_err(dev, DRV_NAME " does not support wakeup\n");
0f78ba96	294	fwnode_handle_put(child);
68252638	295	return -EINVAL;
0e7d0c86 GJ	296	}
0e7d0c86 GJ	297
0f78ba96 DT	298	if (!dev_get_platdata(dev)) {
	299	/* No legacy static platform data */
	300	child = device_get_next_child_node(dev, child);
	301	if (!child) {
	302	dev_err(dev, "missing child device node\n");
	303	return -EINVAL;
	304	}
	305
	306	bdata->gpiod = devm_get_gpiod_from_child(dev, NULL,
	307	child);
	308	if (IS_ERR(bdata->gpiod)) {
	309	error = PTR_ERR(bdata->gpiod);
	310	if (error != -EPROBE_DEFER)
	311	dev_err(dev,
	312	"failed to get gpio: %d\n",
	313	error);
	314	fwnode_handle_put(child);
	315	return error;
	316	}
dadbb0aa SH	317
	318	error = gpiod_direction_input(bdata->gpiod);
	319	if (error) {
	320	dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
	321	desc_to_gpio(bdata->gpiod), error);
	322	fwnode_handle_put(child);
	323	return error;
	324	}
0f78ba96 DT	325	} else if (gpio_is_valid(button->gpio)) {
	326	/*
	327	* Legacy GPIO number so request the GPIO here and
	328	* convert it to descriptor.
	329	*/
1ae5ddb6	330	unsigned flags = GPIOF_IN;
633a21d8 AL	331
	332	if (button->active_low)
	333	flags \|= GPIOF_ACTIVE_LOW;
	334
	335	error = devm_gpio_request_one(&pdev->dev, button->gpio,
	336	flags, button->desc ? : DRV_NAME);
	337	if (error) {
0f78ba96 DT	338	dev_err(dev,
0f78ba96 DT	339	"unable to claim gpio %u, err=%d\n",
633a21d8 AL	340	button->gpio, error);
	341	return error;
	342	}
	343
0f78ba96 DT	344	bdata->gpiod = gpio_to_desc(button->gpio);
	345	if (!bdata->gpiod) {
	346	dev_err(dev,
	347	"unable to convert gpio %u to descriptor\n",
	348	button->gpio);
	349	return -EINVAL;
	350	}
0e7d0c86	351	}
0e7d0c86	352
0e7d0c86 GJ	353	bdata->last_state = -1;
	354	bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
	355	pdata->poll_interval);
	356
	357	input_set_capability(input, type, button->code);
6f29d3b2 HG	358	if (type == EV_ABS)
	359	gpio_keys_polled_set_abs_params(input, pdata,
	360	button->code);
0e7d0c86 GJ	361	}
0e7d0c86 GJ	362
0f78ba96 DT	363	fwnode_handle_put(child);
0f78ba96 DT	364
0e7d0c86 GJ	365	bdev->poll_dev = poll_dev;
	366	bdev->dev = dev;
	367	bdev->pdata = pdata;
0e7d0c86 GJ	368
	369	error = input_register_polled_device(poll_dev);
	370	if (error) {
	371	dev_err(dev, "unable to register polled device, err=%d\n",
	372	error);
68252638	373	return error;
0e7d0c86 GJ	374	}
	375
	376	/* report initial state of the buttons */
	377	for (i = 0; i < pdata->nbuttons; i++)
6f29d3b2	378	gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
a2f25245	379	&bdev->data[i]);
0e7d0c86	380
6f29d3b2 HG	381	input_sync(input);
6f29d3b2 HG	382
0e7d0c86	383	return 0;
0e7d0c86 GJ	384	}
	385
	386	static struct platform_driver gpio_keys_polled_driver = {
	387	.probe = gpio_keys_polled_probe,
0e7d0c86 GJ	388	.driver = {
0e7d0c86 GJ	389	.name = DRV_NAME,
b26d4e22	390	.of_match_table = gpio_keys_polled_of_match,
0e7d0c86 GJ	391	},
0e7d0c86 GJ	392	};
5146c84f	393	module_platform_driver(gpio_keys_polled_driver);
0e7d0c86 GJ	394
	395	MODULE_LICENSE("GPL v2");
	396	MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
	397	MODULE_DESCRIPTION("Polled GPIO Buttons driver");
	398	MODULE_ALIAS("platform:" DRV_NAME);