1/*
2 * Hisilicon PMIC powerkey driver
3 *
4 * Copyright (C) 2013 Hisilicon Ltd.
5 * Copyright (C) 2015, 2016 Linaro Ltd.
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file "COPYING" in the main directory of this
9 * archive for more details.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/platform_device.h>
18#include <linux/interrupt.h>
19#include <linux/reboot.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/of_irq.h>
23#include <linux/input.h>
24#include <linux/slab.h>
25
26/* the held interrupt will trigger after 4 seconds */
27#define MAX_HELD_TIME	(4 * MSEC_PER_SEC)
28
29static irqreturn_t hi65xx_power_press_isr(int irq, void *q)
30{
31	struct input_dev *input = q;
32
33	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
34	input_report_key(input, KEY_POWER, 1);
35	input_sync(input);
36
37	return IRQ_HANDLED;
38}
39
40static irqreturn_t hi65xx_power_release_isr(int irq, void *q)
41{
42	struct input_dev *input = q;
43
44	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
45	input_report_key(input, KEY_POWER, 0);
46	input_sync(input);
47
48	return IRQ_HANDLED;
49}
50
51static irqreturn_t hi65xx_restart_toggle_isr(int irq, void *q)
52{
53	struct input_dev *input = q;
54	int value = test_bit(KEY_RESTART, input->key);
55
56	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
57	input_report_key(input, KEY_RESTART, !value);
58	input_sync(input);
59
60	return IRQ_HANDLED;
61}
62
63static const struct {
64	const char *name;
65	irqreturn_t (*handler)(int irq, void *q);
66} hi65xx_irq_info[] = {
67	{ "down", hi65xx_power_press_isr },
68	{ "up", hi65xx_power_release_isr },
69	{ "hold 4s", hi65xx_restart_toggle_isr },
70};
71
72static int hi65xx_powerkey_probe(struct platform_device *pdev)
73{
74	struct device *dev = &pdev->dev;
75	struct input_dev *input;
76	int irq, i, error;
77
78	input = devm_input_allocate_device(dev);
79	if (!input) {
80		dev_err(dev, "failed to allocate input device\n");
81		return -ENOMEM;
82	}
83
84	input->phys = "hisi_on/input0";
85	input->name = "HISI 65xx PowerOn Key";
86
87	input_set_capability(input, EV_KEY, KEY_POWER);
88	input_set_capability(input, EV_KEY, KEY_RESTART);
89
90	for (i = 0; i < ARRAY_SIZE(hi65xx_irq_info); i++) {
91
92		irq = platform_get_irq_byname(pdev, hi65xx_irq_info[i].name);
93		if (irq < 0)
94			return irq;
95
96		error = devm_request_any_context_irq(dev, irq,
97						     hi65xx_irq_info[i].handler,
98						     IRQF_ONESHOT,
99						     hi65xx_irq_info[i].name,
100						     input);
101		if (error < 0) {
102			dev_err(dev, "couldn't request irq %s: %d\n",
103				hi65xx_irq_info[i].name, error);
104			return error;
105		}
106	}
107
108	error = input_register_device(input);
109	if (error) {
110		dev_err(dev, "failed to register input device: %d\n", error);
111		return error;
112	}
113
114	device_init_wakeup(dev, 1);
115
116	return 0;
117}
118
119static struct platform_driver hi65xx_powerkey_driver = {
120	.driver = {
121		.name = "hi65xx-powerkey",
122	},
123	.probe = hi65xx_powerkey_probe,
124};
125module_platform_driver(hi65xx_powerkey_driver);
126
127MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
128MODULE_DESCRIPTION("Hisi PMIC Power key driver");
129MODULE_LICENSE("GPL v2");
130