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 */
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 
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