2019-06-04 08:11:33 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2010-12-07 01:14:47 +00:00
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/*
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* Driver for buttons on GPIO lines not capable of generating interrupts
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*
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* Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
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*
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* This file was based on: /drivers/input/misc/cobalt_btns.c
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* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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*
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* also was based on: /drivers/input/keyboard/gpio_keys.c
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* Copyright 2005 Phil Blundell
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/input-polldev.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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2014-10-21 21:30:25 +00:00
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#include <linux/gpio/consumer.h>
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2010-12-07 01:14:47 +00:00
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#include <linux/gpio_keys.h>
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2014-10-21 11:34:00 +00:00
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#include <linux/property.h>
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2010-12-07 01:14:47 +00:00
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#define DRV_NAME "gpio-keys-polled"
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struct gpio_keys_button_data {
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2016-02-23 23:32:14 +00:00
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struct gpio_desc *gpiod;
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2010-12-07 01:14:47 +00:00
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int last_state;
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int count;
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int threshold;
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};
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struct gpio_keys_polled_dev {
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struct input_polled_dev *poll_dev;
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struct device *dev;
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2012-07-30 05:48:33 +00:00
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const struct gpio_keys_platform_data *pdata;
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2015-10-14 23:44:35 +00:00
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unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
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unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
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2010-12-07 01:14:47 +00:00
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struct gpio_keys_button_data data[0];
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};
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2015-10-14 23:44:35 +00:00
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static void gpio_keys_button_event(struct input_polled_dev *dev,
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2016-02-23 23:32:14 +00:00
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const struct gpio_keys_button *button,
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2015-10-14 23:44:35 +00:00
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int state)
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{
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struct gpio_keys_polled_dev *bdev = dev->private;
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struct input_dev *input = dev->input;
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unsigned int type = button->type ?: EV_KEY;
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if (type == EV_REL) {
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if (state) {
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input_event(input, type, button->code, button->value);
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__set_bit(button->code, bdev->rel_axis_seen);
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}
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} else if (type == EV_ABS) {
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if (state) {
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input_event(input, type, button->code, button->value);
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__set_bit(button->code, bdev->abs_axis_seen);
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}
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} else {
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input_event(input, type, button->code, state);
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input_sync(input);
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}
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}
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static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
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2016-02-23 23:32:14 +00:00
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const struct gpio_keys_button *button,
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2010-12-07 01:14:47 +00:00
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struct gpio_keys_button_data *bdata)
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{
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int state;
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2016-10-19 23:36:19 +00:00
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state = gpiod_get_value_cansleep(bdata->gpiod);
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if (state < 0) {
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dev_err(dev->input->dev.parent,
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"failed to get gpio state: %d\n", state);
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} else {
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gpio_keys_button_event(dev, button, state);
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2010-12-07 01:14:47 +00:00
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2016-10-19 23:36:19 +00:00
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if (state != bdata->last_state) {
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bdata->count = 0;
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bdata->last_state = state;
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}
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2010-12-07 01:14:47 +00:00
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}
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}
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static void gpio_keys_polled_poll(struct input_polled_dev *dev)
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{
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struct gpio_keys_polled_dev *bdev = dev->private;
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2012-07-30 05:48:33 +00:00
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const struct gpio_keys_platform_data *pdata = bdev->pdata;
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2010-12-07 01:14:47 +00:00
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struct input_dev *input = dev->input;
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int i;
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2015-10-14 23:44:35 +00:00
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memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
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memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
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2012-07-30 05:48:33 +00:00
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for (i = 0; i < pdata->nbuttons; i++) {
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2010-12-07 01:14:47 +00:00
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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2015-10-14 23:44:35 +00:00
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if (bdata->count < bdata->threshold) {
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2010-12-07 01:14:47 +00:00
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bdata->count++;
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2015-10-14 23:44:35 +00:00
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gpio_keys_button_event(dev, &pdata->buttons[i],
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bdata->last_state);
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} else {
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gpio_keys_polled_check_state(dev, &pdata->buttons[i],
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2010-12-07 01:14:47 +00:00
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bdata);
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2015-10-14 23:44:35 +00:00
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}
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}
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for_each_set_bit(i, input->relbit, REL_CNT) {
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if (!test_bit(i, bdev->rel_axis_seen))
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input_event(input, EV_REL, i, 0);
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}
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for_each_set_bit(i, input->absbit, ABS_CNT) {
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if (!test_bit(i, bdev->abs_axis_seen))
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input_event(input, EV_ABS, i, 0);
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2010-12-07 01:14:47 +00:00
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}
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2015-10-14 23:44:35 +00:00
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input_sync(input);
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2010-12-07 01:14:47 +00:00
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}
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static void gpio_keys_polled_open(struct input_polled_dev *dev)
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{
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struct gpio_keys_polled_dev *bdev = dev->private;
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2012-07-30 05:48:33 +00:00
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const struct gpio_keys_platform_data *pdata = bdev->pdata;
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2010-12-07 01:14:47 +00:00
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if (pdata->enable)
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pdata->enable(bdev->dev);
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}
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static void gpio_keys_polled_close(struct input_polled_dev *dev)
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{
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struct gpio_keys_polled_dev *bdev = dev->private;
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2012-07-30 05:48:33 +00:00
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const struct gpio_keys_platform_data *pdata = bdev->pdata;
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2010-12-07 01:14:47 +00:00
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if (pdata->disable)
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pdata->disable(bdev->dev);
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}
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2016-02-23 23:32:14 +00:00
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static struct gpio_keys_platform_data *
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gpio_keys_polled_get_devtree_pdata(struct device *dev)
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2012-08-01 05:08:45 +00:00
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{
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struct gpio_keys_platform_data *pdata;
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struct gpio_keys_button *button;
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2014-10-21 11:34:00 +00:00
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struct fwnode_handle *child;
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2012-08-01 05:08:45 +00:00
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int nbuttons;
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2014-10-21 11:34:00 +00:00
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nbuttons = device_get_child_node_count(dev);
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2012-08-01 05:08:45 +00:00
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if (nbuttons == 0)
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2016-02-23 23:32:14 +00:00
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return ERR_PTR(-EINVAL);
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2012-08-01 05:08:45 +00:00
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2014-04-28 17:48:49 +00:00
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pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
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GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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2012-08-01 05:08:45 +00:00
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2016-02-23 23:32:14 +00:00
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button = (struct gpio_keys_button *)(pdata + 1);
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pdata->buttons = button;
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pdata->nbuttons = nbuttons;
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2012-08-01 05:08:45 +00:00
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2014-10-21 11:34:00 +00:00
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pdata->rep = device_property_present(dev, "autorepeat");
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device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
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2012-08-01 05:08:45 +00:00
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2019-07-07 05:55:46 +00:00
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device_property_read_string(dev, "label", &pdata->name);
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2014-10-21 11:34:00 +00:00
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device_for_each_child_node(dev, child) {
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2016-02-23 23:32:14 +00:00
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if (fwnode_property_read_u32(child, "linux,code",
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&button->code)) {
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dev_err(dev, "button without keycode\n");
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2014-10-21 11:34:00 +00:00
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fwnode_handle_put(child);
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2014-04-28 17:48:49 +00:00
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return ERR_PTR(-EINVAL);
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2012-08-01 05:08:45 +00:00
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}
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2014-10-21 11:34:00 +00:00
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fwnode_property_read_string(child, "label", &button->desc);
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2012-08-01 05:08:45 +00:00
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2014-10-21 11:34:00 +00:00
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if (fwnode_property_read_u32(child, "linux,input-type",
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&button->type))
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2012-08-01 05:08:45 +00:00
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button->type = EV_KEY;
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2015-10-14 23:44:35 +00:00
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if (fwnode_property_read_u32(child, "linux,input-value",
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(u32 *)&button->value))
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button->value = 1;
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2015-07-16 19:10:05 +00:00
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button->wakeup =
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fwnode_property_read_bool(child, "wakeup-source") ||
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/* legacy name */
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fwnode_property_read_bool(child, "gpio-key,wakeup");
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2012-08-01 05:08:45 +00:00
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2014-10-21 11:34:00 +00:00
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if (fwnode_property_read_u32(child, "debounce-interval",
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&button->debounce_interval))
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2012-08-01 05:08:45 +00:00
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button->debounce_interval = 5;
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2016-02-23 23:32:14 +00:00
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button++;
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}
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2012-08-01 05:08:45 +00:00
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return pdata;
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}
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2015-10-14 23:44:35 +00:00
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static void gpio_keys_polled_set_abs_params(struct input_dev *input,
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const struct gpio_keys_platform_data *pdata, unsigned int code)
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{
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int i, min = 0, max = 0;
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for (i = 0; i < pdata->nbuttons; i++) {
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2016-02-23 23:32:14 +00:00
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const struct gpio_keys_button *button = &pdata->buttons[i];
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2015-10-14 23:44:35 +00:00
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if (button->type != EV_ABS || button->code != code)
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continue;
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if (button->value < min)
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min = button->value;
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if (button->value > max)
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max = button->value;
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}
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2016-02-23 23:32:14 +00:00
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2015-10-14 23:44:35 +00:00
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input_set_abs_params(input, code, min, max, 0, 0);
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}
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2014-05-07 19:58:36 +00:00
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static const struct of_device_id gpio_keys_polled_of_match[] = {
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2012-08-01 05:08:45 +00:00
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{ .compatible = "gpio-keys-polled", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
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2012-11-24 05:38:25 +00:00
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static int gpio_keys_polled_probe(struct platform_device *pdev)
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2010-12-07 01:14:47 +00:00
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{
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struct device *dev = &pdev->dev;
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2016-02-23 23:32:14 +00:00
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struct fwnode_handle *child = NULL;
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2012-07-30 05:48:33 +00:00
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const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
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2010-12-07 01:14:47 +00:00
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struct gpio_keys_polled_dev *bdev;
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struct input_polled_dev *poll_dev;
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struct input_dev *input;
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int error;
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int i;
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2012-08-01 05:08:45 +00:00
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if (!pdata) {
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pdata = gpio_keys_polled_get_devtree_pdata(dev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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if (!pdata->poll_interval) {
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dev_err(dev, "missing poll_interval value\n");
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2014-04-28 17:48:49 +00:00
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return -EINVAL;
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2012-08-01 05:08:45 +00:00
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}
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2010-12-07 01:14:47 +00:00
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Input: gpio_keys_polled - use struct_size() in devm_kzalloc()
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct gpio_keys_polled_dev {
...
struct gpio_keys_button_data data[0];
};
size = sizeof(struct gpio_keys_polled_dev) + count * sizeof(struct gpio_keys_button_data);
instance = devm_kzalloc(dev, size, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = devm_kzalloc(dev, struct_size(instance, data, count), GFP_KERNEL);
Notice that, in this case, variable size is not necessary, hence it
is removed.
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2019-06-23 06:33:21 +00:00
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bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
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GFP_KERNEL);
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2010-12-07 01:14:47 +00:00
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if (!bdev) {
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dev_err(dev, "no memory for private data\n");
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2014-04-28 17:48:49 +00:00
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return -ENOMEM;
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2010-12-07 01:14:47 +00:00
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}
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2017-01-22 07:40:45 +00:00
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poll_dev = devm_input_allocate_polled_device(dev);
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2010-12-07 01:14:47 +00:00
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if (!poll_dev) {
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dev_err(dev, "no memory for polled device\n");
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2014-04-28 17:48:49 +00:00
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return -ENOMEM;
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2010-12-07 01:14:47 +00:00
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}
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poll_dev->private = bdev;
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poll_dev->poll = gpio_keys_polled_poll;
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poll_dev->poll_interval = pdata->poll_interval;
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poll_dev->open = gpio_keys_polled_open;
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poll_dev->close = gpio_keys_polled_close;
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input = poll_dev->input;
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2019-07-07 05:55:46 +00:00
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input->name = pdata->name ?: pdev->name;
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2010-12-07 01:14:47 +00:00
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input->phys = DRV_NAME"/input0";
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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2012-11-29 16:57:17 +00:00
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__set_bit(EV_KEY, input->evbit);
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if (pdata->rep)
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__set_bit(EV_REP, input->evbit);
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2010-12-07 01:14:47 +00:00
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for (i = 0; i < pdata->nbuttons; i++) {
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2016-02-23 23:32:14 +00:00
|
|
|
const struct gpio_keys_button *button = &pdata->buttons[i];
|
2010-12-07 01:14:47 +00:00
|
|
|
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");
|
2016-02-23 23:32:14 +00:00
|
|
|
fwnode_handle_put(child);
|
2014-04-28 17:48:49 +00:00
|
|
|
return -EINVAL;
|
2010-12-07 01:14:47 +00:00
|
|
|
}
|
|
|
|
|
2016-02-23 23:32:14 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2017-02-02 13:53:10 +00:00
|
|
|
bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
|
|
|
|
NULL, child,
|
|
|
|
GPIOD_IN,
|
|
|
|
button->desc);
|
2016-02-23 23:32:14 +00:00
|
|
|
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.
|
|
|
|
*/
|
2015-08-20 19:00:19 +00:00
|
|
|
unsigned flags = GPIOF_IN;
|
2014-10-21 21:30:25 +00:00
|
|
|
|
|
|
|
if (button->active_low)
|
|
|
|
flags |= GPIOF_ACTIVE_LOW;
|
|
|
|
|
2017-01-22 07:40:45 +00:00
|
|
|
error = devm_gpio_request_one(dev, button->gpio,
|
2014-10-21 21:30:25 +00:00
|
|
|
flags, button->desc ? : DRV_NAME);
|
|
|
|
if (error) {
|
2016-02-23 23:32:14 +00:00
|
|
|
dev_err(dev,
|
|
|
|
"unable to claim gpio %u, err=%d\n",
|
2014-10-21 21:30:25 +00:00
|
|
|
button->gpio, error);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2016-02-23 23:32:14 +00:00
|
|
|
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;
|
|
|
|
}
|
2010-12-07 01:14:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
bdata->last_state = -1;
|
|
|
|
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
|
|
|
|
pdata->poll_interval);
|
|
|
|
|
|
|
|
input_set_capability(input, type, button->code);
|
2015-10-14 23:44:35 +00:00
|
|
|
if (type == EV_ABS)
|
|
|
|
gpio_keys_polled_set_abs_params(input, pdata,
|
|
|
|
button->code);
|
2010-12-07 01:14:47 +00:00
|
|
|
}
|
|
|
|
|
2016-02-23 23:32:14 +00:00
|
|
|
fwnode_handle_put(child);
|
|
|
|
|
2010-12-07 01:14:47 +00:00
|
|
|
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);
|
2014-04-28 17:48:49 +00:00
|
|
|
return error;
|
2010-12-07 01:14:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* report initial state of the buttons */
|
|
|
|
for (i = 0; i < pdata->nbuttons; i++)
|
2015-10-14 23:44:35 +00:00
|
|
|
gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
|
2012-08-01 05:08:45 +00:00
|
|
|
&bdev->data[i]);
|
2010-12-07 01:14:47 +00:00
|
|
|
|
2015-10-14 23:44:35 +00:00
|
|
|
input_sync(input);
|
|
|
|
|
2010-12-07 01:14:47 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver gpio_keys_polled_driver = {
|
|
|
|
.probe = gpio_keys_polled_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = DRV_NAME,
|
2014-10-21 11:34:00 +00:00
|
|
|
.of_match_table = gpio_keys_polled_of_match,
|
2010-12-07 01:14:47 +00:00
|
|
|
},
|
|
|
|
};
|
2011-11-29 19:08:39 +00:00
|
|
|
module_platform_driver(gpio_keys_polled_driver);
|
2010-12-07 01:14:47 +00:00
|
|
|
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
|
|
|
MODULE_DESCRIPTION("Polled GPIO Buttons driver");
|
|
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|