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