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(regmap: button->regmap, virq: 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(dev: button->dev, msec: 0);
40 input_report_key(dev: button->idev, KEY_POWER, value: val);
41 input_sync(dev: 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(dev: &pdev->dev, size: 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(dev: 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(dev: button->idev, EV_KEY, KEY_POWER);
73
74 err = devm_request_threaded_irq(dev: &pdev->dev, irq, NULL,
75 thread_fn: powerbutton_irq, IRQF_ONESHOT, devname: "cpcap_pwrbutton", dev_id: 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(dev: &pdev->dev, enable: 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>");
113

source code of linux/drivers/input/misc/cpcap-pwrbutton.c