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 | |
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(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 | |
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(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 |
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 | |