GNU Linux-libre 4.19.314-gnu1
[releases.git] / drivers / input / misc / ab8500-ponkey.c
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  */
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                 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
116 static const struct of_device_id ab8500_ponkey_match[] = {
117         { .compatible = "stericsson,ab8500-ponkey", },
118         {}
119 };
120 MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
121 #endif
122
123 static 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 };
130 module_platform_driver(ab8500_ponkey_driver);
131
132 MODULE_LICENSE("GPL v2");
133 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
134 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");