1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) ST-Ericsson SA 2010 |
4 | * |
5 | * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson |
6 | * |
7 | * AB8500 Power-On Key handler |
8 | */ |
9 | |
10 | #include <linux/device.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/input.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/mfd/abx500/ab8500.h> |
17 | #include <linux/of.h> |
18 | #include <linux/slab.h> |
19 | |
20 | /** |
21 | * struct ab8500_ponkey - ab8500 ponkey information |
22 | * @idev: pointer to input device |
23 | * @ab8500: ab8500 parent |
24 | * @irq_dbf: irq number for falling transition |
25 | * @irq_dbr: irq number for rising transition |
26 | */ |
27 | struct ab8500_ponkey { |
28 | struct input_dev *idev; |
29 | struct ab8500 *ab8500; |
30 | int irq_dbf; |
31 | int irq_dbr; |
32 | }; |
33 | |
34 | /* AB8500 gives us an interrupt when ONKEY is held */ |
35 | static irqreturn_t ab8500_ponkey_handler(int irq, void *data) |
36 | { |
37 | struct ab8500_ponkey *ponkey = data; |
38 | |
39 | if (irq == ponkey->irq_dbf) |
40 | input_report_key(dev: ponkey->idev, KEY_POWER, value: true); |
41 | else if (irq == ponkey->irq_dbr) |
42 | input_report_key(dev: ponkey->idev, KEY_POWER, value: false); |
43 | |
44 | input_sync(dev: ponkey->idev); |
45 | |
46 | return IRQ_HANDLED; |
47 | } |
48 | |
49 | static int ab8500_ponkey_probe(struct platform_device *pdev) |
50 | { |
51 | struct ab8500 *ab8500 = dev_get_drvdata(dev: pdev->dev.parent); |
52 | struct ab8500_ponkey *ponkey; |
53 | struct input_dev *input; |
54 | int irq_dbf, irq_dbr; |
55 | int error; |
56 | |
57 | irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF" ); |
58 | if (irq_dbf < 0) |
59 | return irq_dbf; |
60 | |
61 | irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR" ); |
62 | if (irq_dbr < 0) |
63 | return irq_dbr; |
64 | |
65 | ponkey = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct ab8500_ponkey), |
66 | GFP_KERNEL); |
67 | if (!ponkey) |
68 | return -ENOMEM; |
69 | |
70 | input = devm_input_allocate_device(&pdev->dev); |
71 | if (!input) |
72 | return -ENOMEM; |
73 | |
74 | ponkey->idev = input; |
75 | ponkey->ab8500 = ab8500; |
76 | ponkey->irq_dbf = irq_dbf; |
77 | ponkey->irq_dbr = irq_dbr; |
78 | |
79 | input->name = "AB8500 POn(PowerOn) Key" ; |
80 | input->dev.parent = &pdev->dev; |
81 | |
82 | input_set_capability(dev: input, EV_KEY, KEY_POWER); |
83 | |
84 | error = devm_request_any_context_irq(dev: &pdev->dev, irq: ponkey->irq_dbf, |
85 | handler: ab8500_ponkey_handler, irqflags: 0, |
86 | devname: "ab8500-ponkey-dbf" , dev_id: ponkey); |
87 | if (error < 0) { |
88 | dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n" , |
89 | ponkey->irq_dbf, error); |
90 | return error; |
91 | } |
92 | |
93 | error = devm_request_any_context_irq(dev: &pdev->dev, irq: ponkey->irq_dbr, |
94 | handler: ab8500_ponkey_handler, irqflags: 0, |
95 | devname: "ab8500-ponkey-dbr" , dev_id: ponkey); |
96 | if (error < 0) { |
97 | dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n" , |
98 | ponkey->irq_dbr, error); |
99 | return error; |
100 | } |
101 | |
102 | error = input_register_device(ponkey->idev); |
103 | if (error) { |
104 | dev_err(ab8500->dev, "Can't register input device: %d\n" , error); |
105 | return error; |
106 | } |
107 | |
108 | return 0; |
109 | } |
110 | |
111 | #ifdef CONFIG_OF |
112 | static const struct of_device_id ab8500_ponkey_match[] = { |
113 | { .compatible = "stericsson,ab8500-ponkey" , }, |
114 | {} |
115 | }; |
116 | MODULE_DEVICE_TABLE(of, ab8500_ponkey_match); |
117 | #endif |
118 | |
119 | static struct platform_driver ab8500_ponkey_driver = { |
120 | .driver = { |
121 | .name = "ab8500-poweron-key" , |
122 | .of_match_table = of_match_ptr(ab8500_ponkey_match), |
123 | }, |
124 | .probe = ab8500_ponkey_probe, |
125 | }; |
126 | module_platform_driver(ab8500_ponkey_driver); |
127 | |
128 | MODULE_LICENSE("GPL v2" ); |
129 | MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>" ); |
130 | MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver" ); |
131 | |