Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.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/kernel.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/input.h>
14 #include <linux/interrupt.h>
15 #include <linux/mfd/ab8500.h>
16 #include <linux/slab.h>
17
18 /**
19  * struct ab8500_ponkey - ab8500 ponkey information
20  * @input_dev: pointer to input device
21  * @ab8500: ab8500 parent
22  * @irq_dbf: irq number for falling transition
23  * @irq_dbr: irq number for rising transition
24  */
25 struct ab8500_ponkey {
26         struct input_dev        *idev;
27         struct ab8500           *ab8500;
28         int                     irq_dbf;
29         int                     irq_dbr;
30 };
31
32 /* AB8500 gives us an interrupt when ONKEY is held */
33 static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
34 {
35         struct ab8500_ponkey *ponkey = data;
36
37         if (irq == ponkey->irq_dbf)
38                 input_report_key(ponkey->idev, KEY_POWER, true);
39         else if (irq == ponkey->irq_dbr)
40                 input_report_key(ponkey->idev, KEY_POWER, false);
41
42         input_sync(ponkey->idev);
43
44         return IRQ_HANDLED;
45 }
46
47 static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
48 {
49         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
50         struct ab8500_ponkey *ponkey;
51         struct input_dev *input;
52         int irq_dbf, irq_dbr;
53         int error;
54
55         irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
56         if (irq_dbf < 0) {
57                 dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
58                 return irq_dbf;
59         }
60
61         irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
62         if (irq_dbr < 0) {
63                 dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
64                 return irq_dbr;
65         }
66
67         ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
68         input = input_allocate_device();
69         if (!ponkey || !input) {
70                 error = -ENOMEM;
71                 goto err_free_mem;
72         }
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 = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
85                                         0, "ab8500-ponkey-dbf", ponkey);
86         if (error < 0) {
87                 dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
88                         ponkey->irq_dbf, error);
89                 goto err_free_mem;
90         }
91
92         error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
93                                         0, "ab8500-ponkey-dbr", ponkey);
94         if (error < 0) {
95                 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
96                         ponkey->irq_dbr, error);
97                 goto err_free_dbf_irq;
98         }
99
100         error = input_register_device(ponkey->idev);
101         if (error) {
102                 dev_err(ab8500->dev, "Can't register input device: %d\n", error);
103                 goto err_free_dbr_irq;
104         }
105
106         platform_set_drvdata(pdev, ponkey);
107         return 0;
108
109 err_free_dbr_irq:
110         free_irq(ponkey->irq_dbr, ponkey);
111 err_free_dbf_irq:
112         free_irq(ponkey->irq_dbf, ponkey);
113 err_free_mem:
114         input_free_device(input);
115         kfree(ponkey);
116
117         return error;
118 }
119
120 static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
121 {
122         struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
123
124         free_irq(ponkey->irq_dbf, ponkey);
125         free_irq(ponkey->irq_dbr, ponkey);
126         input_unregister_device(ponkey->idev);
127         kfree(ponkey);
128
129         platform_set_drvdata(pdev, NULL);
130
131         return 0;
132 }
133
134 static struct platform_driver ab8500_ponkey_driver = {
135         .driver         = {
136                 .name   = "ab8500-poweron-key",
137                 .owner  = THIS_MODULE,
138         },
139         .probe          = ab8500_ponkey_probe,
140         .remove         = __devexit_p(ab8500_ponkey_remove),
141 };
142
143 static int __init ab8500_ponkey_init(void)
144 {
145         return platform_driver_register(&ab8500_ponkey_driver);
146 }
147 module_init(ab8500_ponkey_init);
148
149 static void __exit ab8500_ponkey_exit(void)
150 {
151         platform_driver_unregister(&ab8500_ponkey_driver);
152 }
153 module_exit(ab8500_ponkey_exit);
154
155 MODULE_LICENSE("GPL v2");
156 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
157 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");