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 * @input_dev: 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 */
ab8500_ponkey_handler(int irq,void * data)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(ponkey->idev, KEY_POWER, true);
41 else if (irq == ponkey->irq_dbr)
42 input_report_key(ponkey->idev, KEY_POWER, false);
43
44 input_sync(ponkey->idev);
45
46 return IRQ_HANDLED;
47 }
48
ab8500_ponkey_probe(struct platform_device * pdev)49 static int ab8500_ponkey_probe(struct platform_device *pdev)
50 {
51 struct ab8500 *ab8500 = dev_get_drvdata(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(&pdev->dev, 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(input, EV_KEY, KEY_POWER);
83
84 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
85 ab8500_ponkey_handler, 0,
86 "ab8500-ponkey-dbf", 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(&pdev->dev, ponkey->irq_dbr,
94 ab8500_ponkey_handler, 0,
95 "ab8500-ponkey-dbr", 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
