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Release 4.11 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); } }

Contributors

PersonTokensPropCommitsCommitProp
Hans de Goede14394.70%133.33%
Gabor Juhos74.64%133.33%
Dmitry Torokhov10.66%133.33%
Total151100.00%3100.00%


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; } } }

Contributors

PersonTokensPropCommitsCommitProp
Gabor Juhos4953.85%120.00%
Dmitry Torokhov2325.27%240.00%
Hans de Goede1718.68%120.00%
Aaron Lu22.20%120.00%
Total91100.00%5100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Hans de Goede12555.07%133.33%
Gabor Juhos10144.49%133.33%
Dmitry Torokhov10.44%133.33%
Total227100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Gabor Juhos4497.78%150.00%
Dmitry Torokhov12.22%150.00%
Total45100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Gabor Juhos4497.78%150.00%
Dmitry Torokhov12.22%150.00%
Total45100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Alexandre Pereira da Silva17261.87%116.67%
Aaron Lu3211.51%116.67%
Dmitry Torokhov3111.15%233.33%
Hans de Goede248.63%116.67%
Alexander Shiyan196.83%116.67%
Total278100.00%6100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Hans de Goede12099.17%150.00%
Dmitry Torokhov10.83%150.00%
Total121100.00%2100.00%

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(dev, size, 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 = 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; }

Contributors

PersonTokensPropCommitsCommitProp
Gabor Juhos40255.83%17.69%
Dmitry Torokhov13719.03%323.08%
Alexander Shiyan577.92%215.38%
Aaron Lu527.22%17.69%
Alexandre Pereira da Silva415.69%17.69%
Hans de Goede233.19%17.69%
Alexander Stein40.56%17.69%
Andy Shevchenko20.28%17.69%
Boris Brezillon10.14%17.69%
Vincent Pelletier10.14%17.69%
Total720100.00%13100.00%

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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Gabor Juhos76841.27%15.56%
Hans de Goede47225.36%15.56%
Alexandre Pereira da Silva24213.00%15.56%
Dmitry Torokhov20210.85%527.78%
Aaron Lu904.84%211.11%
Alexander Shiyan764.08%211.11%
Alexander Stein40.21%15.56%
Andy Shevchenko20.11%15.56%
JJ Ding20.11%15.56%
Vincent Pelletier10.05%15.56%
Boris Brezillon10.05%15.56%
Jingoo Han10.05%15.56%
Total1861100.00%18100.00%
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