1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * CPCAP Power Button Input Driver
  4 *
  5 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/init.h>
 10#include <linux/kernel.h>
 11#include <linux/errno.h>
 12#include <linux/input.h>
 13#include <linux/interrupt.h>
 14#include <linux/regmap.h>
 15#include <linux/of.h>
 16#include <linux/platform_device.h>
 17#include <linux/mfd/motorola-cpcap.h>
 18
 19#define CPCAP_IRQ_ON 23
 20#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
 21
 22struct cpcap_power_button {
 23	struct regmap *regmap;
 24	struct input_dev *idev;
 25	struct device *dev;
 26};
 27
 28static irqreturn_t powerbutton_irq(int irq, void *_button)
 29{
 30	struct cpcap_power_button *button = _button;
 31	int val;
 32
 33	val = cpcap_sense_virq(button->regmap, irq);
 34	if (val < 0) {
 35		dev_err(button->dev, "irq read failed: %d", val);
 36		return IRQ_HANDLED;
 37	}
 38
 39	pm_wakeup_event(button->dev, 0);
 40	input_report_key(button->idev, KEY_POWER, val);
 41	input_sync(button->idev);
 42
 43	return IRQ_HANDLED;
 44}
 45
 46static int cpcap_power_button_probe(struct platform_device *pdev)
 47{
 48	struct cpcap_power_button *button;
 49	int irq;
 50	int err;
 51
 52	irq = platform_get_irq(pdev, 0);
 53	if (irq < 0)
 54		return irq;
 55
 56	button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
 57	if (!button)
 58		return -ENOMEM;
 59
 60	button->idev = devm_input_allocate_device(&pdev->dev);
 61	if (!button->idev)
 62		return -ENOMEM;
 63
 64	button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 65	if (!button->regmap)
 66		return -ENODEV;
 67
 68	button->dev = &pdev->dev;
 69
 70	button->idev->name = "cpcap-pwrbutton";
 71	button->idev->phys = "cpcap-pwrbutton/input0";
 72	input_set_capability(button->idev, EV_KEY, KEY_POWER);
 73
 74	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 75		powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
 76	if (err < 0) {
 77		dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
 78		return err;
 79	}
 80
 81	err = input_register_device(button->idev);
 82	if (err) {
 83		dev_err(&pdev->dev, "Input register failed: %d\n", err);
 84		return err;
 85	}
 86
 87	device_init_wakeup(&pdev->dev, true);
 88
 89	return 0;
 90}
 91
 92#ifdef CONFIG_OF
 93static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
 94	{ .compatible = "motorola,cpcap-pwrbutton" },
 95	{},
 96};
 97MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
 98#endif
 99
100static struct platform_driver cpcap_power_button_driver = {
101	.probe		= cpcap_power_button_probe,
102	.driver		= {
103		.name	= "cpcap-pwrbutton",
104		.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
105	},
106};
107module_platform_driver(cpcap_power_button_driver);
108
109MODULE_ALIAS("platform:cpcap-pwrbutton");
110MODULE_DESCRIPTION("CPCAP Power Button");
111MODULE_LICENSE("GPL");
112MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");