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>");
118