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_dbf, 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");
158