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1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License v2
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 */
27struct 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 */
35static 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
49static 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 dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
60 return irq_dbf;
61 }
62
63 irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
64 if (irq_dbr < 0) {
65 dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
66 return irq_dbr;
67 }
68
69 ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
70 GFP_KERNEL);
71 if (!ponkey)
72 return -ENOMEM;
73
74 input = devm_input_allocate_device(&pdev->dev);
75 if (!input)
76 return -ENOMEM;
77
78 ponkey->idev = input;
79 ponkey->ab8500 = ab8500;
80 ponkey->irq_dbf = irq_dbf;
81 ponkey->irq_dbr = irq_dbr;
82
83 input->name = "AB8500 POn(PowerOn) Key";
84 input->dev.parent = &pdev->dev;
85
86 input_set_capability(input, EV_KEY, KEY_POWER);
87
88 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
89 ab8500_ponkey_handler, 0,
90 "ab8500-ponkey-dbf", ponkey);
91 if (error < 0) {
92 dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
93 ponkey->irq_dbf, error);
94 return error;
95 }
96
97 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
98 ab8500_ponkey_handler, 0,
99 "ab8500-ponkey-dbr", ponkey);
100 if (error < 0) {
101 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
102 ponkey->irq_dbr, error);
103 return error;
104 }
105
106 error = input_register_device(ponkey->idev);
107 if (error) {
108 dev_err(ab8500->dev, "Can't register input device: %d\n", error);
109 return error;
110 }
111
112 return 0;
113}
114
115#ifdef CONFIG_OF
116static const struct of_device_id ab8500_ponkey_match[] = {
117 { .compatible = "stericsson,ab8500-ponkey", },
118 {}
119};
120MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
121#endif
122
123static struct platform_driver ab8500_ponkey_driver = {
124 .driver = {
125 .name = "ab8500-poweron-key",
126 .of_match_table = of_match_ptr(ab8500_ponkey_match),
127 },
128 .probe = ab8500_ponkey_probe,
129};
130module_platform_driver(ab8500_ponkey_driver);
131
132MODULE_LICENSE("GPL v2");
133MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
134MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
135

Warning: That file was not part of the compilation database. It may have many parsing errors.