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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;
58 int err;
59
60 irq = platform_get_irq(pdev, 0);
61 if (irq < 0)
62 return irq;
63
64 button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
65 if (!button)
66 return -ENOMEM;
67
68 button->idev = devm_input_allocate_device(&pdev->dev);
69 if (!button->idev)
70 return -ENOMEM;
71
72 button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
73 if (!button->regmap)
74 return -ENODEV;
75
76 button->dev = &pdev->dev;
77
78 button->idev->name = "cpcap-pwrbutton";
79 button->idev->phys = "cpcap-pwrbutton/input0";
80 input_set_capability(button->idev, EV_KEY, KEY_POWER);
81
82 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
83 powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
84 if (err < 0) {
85 dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
86 return err;
87 }
88
89 err = input_register_device(button->idev);
90 if (err) {
91 dev_err(&pdev->dev, "Input register failed: %d\n", err);
92 return err;
93 }
94
95 device_init_wakeup(&pdev->dev, true);
96
97 return 0;
98}
99
100#ifdef CONFIG_OF
101static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
102 { .compatible = "motorola,cpcap-pwrbutton" },
103 {},
104};
105MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
106#endif
107
108static struct platform_driver cpcap_power_button_driver = {
109 .probe = cpcap_power_button_probe,
110 .driver = {
111 .name = "cpcap-pwrbutton",
112 .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
113 },
114};
115module_platform_driver(cpcap_power_button_driver);
116
117MODULE_ALIAS("platform:cpcap-pwrbutton");
118MODULE_DESCRIPTION("CPCAP Power Button");
119MODULE_LICENSE("GPL");
120MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");