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
22 struct cpcap_power_button {
23 struct regmap *regmap;
24 struct input_dev *idev;
25 struct device *dev;
26 };
27
powerbutton_irq(int irq,void * _button)28 static 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(button->regmap, 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(button->dev, 0);
40 input_report_key(button->idev, KEY_POWER, val);
41 input_sync(button->idev);
42
43 return IRQ_HANDLED;
44 }
45
cpcap_power_button_probe(struct platform_device * pdev)46 static 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(&pdev->dev, 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(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(button->idev, EV_KEY, KEY_POWER);
73
74 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
75 powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", 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(&pdev->dev, true);
88
89 return 0;
90 }
91
92 #ifdef CONFIG_OF
93 static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
94 { .compatible = "motorola,cpcap-pwrbutton" },
95 {},
96 };
97 MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
98 #endif
99
100 static 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 };
107 module_platform_driver(cpcap_power_button_driver);
108
109 MODULE_ALIAS("platform:cpcap-pwrbutton");
110 MODULE_DESCRIPTION("CPCAP Power Button");
111 MODULE_LICENSE("GPL");
112 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
113