1/**
  2 * CPCAP Power Button Input Driver
  3 *
  4 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
  5 *
  6 * This file is subject to the terms and conditions of the GNU General
  7 * Public License. See the file "COPYING" in the main directory of this
  8 * archive for more details.
  9 *
 10 * This program is distributed in the hope that it will be useful,
 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 */
 15
 16#include <linux/module.h>
 17#include <linux/init.h>
 18#include <linux/kernel.h>
 19#include <linux/errno.h>
 20#include <linux/input.h>
 21#include <linux/interrupt.h>
 22#include <linux/regmap.h>
 23#include <linux/of.h>
 24#include <linux/platform_device.h>
 25#include <linux/mfd/motorola-cpcap.h>
 26
 27#define CPCAP_IRQ_ON 23
 28#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
 29
 30struct cpcap_power_button {
 31	struct regmap *regmap;
 32	struct input_dev *idev;
 33	struct device *dev;
 34};
 35
 36static irqreturn_t powerbutton_irq(int irq, void *_button)
 37{
 38	struct cpcap_power_button *button = _button;
 39	int val;
 40
 41	val = cpcap_sense_virq(button->regmap, irq);
 42	if (val < 0) {
 43		dev_err(button->dev, "irq read failed: %d", val);
 44		return IRQ_HANDLED;
 45	}
 46
 47	pm_wakeup_event(button->dev, 0);
 48	input_report_key(button->idev, KEY_POWER, val);
 49	input_sync(button->idev);
 50
 51	return IRQ_HANDLED;
 52}
 53
 54static int cpcap_power_button_probe(struct platform_device *pdev)
 55{
 56	struct cpcap_power_button *button;
 57	int irq = platform_get_irq(pdev, 0);
 58	int err;
 59
 60	button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
 61	if (!button)
 62		return -ENOMEM;
 63
 64	button->idev = devm_input_allocate_device(&pdev->dev);
 65	if (!button->idev)
 66		return -ENOMEM;
 67
 68	button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 69	if (!button->regmap)
 70		return -ENODEV;
 71
 72	button->dev = &pdev->dev;
 73
 74	button->idev->name = "cpcap-pwrbutton";
 75	button->idev->phys = "cpcap-pwrbutton/input0";
 76	button->idev->dev.parent = button->dev;
 77	input_set_capability(button->idev, EV_KEY, KEY_POWER);
 78
 79	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 80		powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
 81	if (err < 0) {
 82		dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
 83		return err;
 84	}
 85
 86	err = input_register_device(button->idev);
 87	if (err) {
 88		dev_err(&pdev->dev, "Input register failed: %d\n", err);
 89		return err;
 90	}
 91
 92	device_init_wakeup(&pdev->dev, true);
 93
 94	return 0;
 95}
 96
 97#ifdef CONFIG_OF
 98static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
 99	{ .compatible = "motorola,cpcap-pwrbutton" },
100	{},
101};
102MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
103#endif
104
105static struct platform_driver cpcap_power_button_driver = {
106	.probe		= cpcap_power_button_probe,
107	.driver		= {
108		.name	= "cpcap-pwrbutton",
109		.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
110	},
111};
112module_platform_driver(cpcap_power_button_driver);
113
114MODULE_ALIAS("platform:cpcap-pwrbutton");
115MODULE_DESCRIPTION("CPCAP Power Button");
116MODULE_LICENSE("GPL");
117MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");