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/abx500/ab8500.h>
16 #include <linux/of.h>
17 #include <linux/slab.h>
18 
19 /**
20  * struct ab8500_ponkey - ab8500 ponkey information
21  * @input_dev: pointer to input device
22  * @ab8500: ab8500 parent
23  * @irq_dbf: irq number for falling transition
24  * @irq_dbr: irq number for rising transition
25  */
26 struct ab8500_ponkey {
27 	struct input_dev	*idev;
28 	struct ab8500		*ab8500;
29 	int			irq_dbf;
30 	int			irq_dbr;
31 };
32 
33 /* AB8500 gives us an interrupt when ONKEY is held */
34 static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
35 {
36 	struct ab8500_ponkey *ponkey = data;
37 
38 	if (irq == ponkey->irq_dbf)
39 		input_report_key(ponkey->idev, KEY_POWER, true);
40 	else if (irq == ponkey->irq_dbr)
41 		input_report_key(ponkey->idev, KEY_POWER, false);
42 
43 	input_sync(ponkey->idev);
44 
45 	return IRQ_HANDLED;
46 }
47 
48 static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
49 {
50 	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
51 	struct ab8500_ponkey *ponkey;
52 	struct input_dev *input;
53 	int irq_dbf, irq_dbr;
54 	int error;
55 
56 	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
57 	if (irq_dbf < 0) {
58 		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
59 		return irq_dbf;
60 	}
61 
62 	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
63 	if (irq_dbr < 0) {
64 		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
65 		return irq_dbr;
66 	}
67 
68 	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
69 	input = input_allocate_device();
70 	if (!ponkey || !input) {
71 		error = -ENOMEM;
72 		goto err_free_mem;
73 	}
74 
75 	ponkey->idev = input;
76 	ponkey->ab8500 = ab8500;
77 	ponkey->irq_dbf = irq_dbf;
78 	ponkey->irq_dbr = irq_dbr;
79 
80 	input->name = "AB8500 POn(PowerOn) Key";
81 	input->dev.parent = &pdev->dev;
82 
83 	input_set_capability(input, EV_KEY, KEY_POWER);
84 
85 	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
86 					0, "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 		goto err_free_mem;
91 	}
92 
93 	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
94 					0, "ab8500-ponkey-dbr", ponkey);
95 	if (error < 0) {
96 		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
97 			ponkey->irq_dbr, error);
98 		goto err_free_dbf_irq;
99 	}
100 
101 	error = input_register_device(ponkey->idev);
102 	if (error) {
103 		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
104 		goto err_free_dbr_irq;
105 	}
106 
107 	platform_set_drvdata(pdev, ponkey);
108 	return 0;
109 
110 err_free_dbr_irq:
111 	free_irq(ponkey->irq_dbr, ponkey);
112 err_free_dbf_irq:
113 	free_irq(ponkey->irq_dbf, ponkey);
114 err_free_mem:
115 	input_free_device(input);
116 	kfree(ponkey);
117 
118 	return error;
119 }
120 
121 static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
122 {
123 	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
124 
125 	free_irq(ponkey->irq_dbf, ponkey);
126 	free_irq(ponkey->irq_dbr, ponkey);
127 	input_unregister_device(ponkey->idev);
128 	kfree(ponkey);
129 
130 	platform_set_drvdata(pdev, NULL);
131 
132 	return 0;
133 }
134 
135 #ifdef CONFIG_OF
136 static const struct of_device_id ab8500_ponkey_match[] = {
137 	{ .compatible = "stericsson,ab8500-ponkey", },
138 	{}
139 };
140 #endif
141 
142 static struct platform_driver ab8500_ponkey_driver = {
143 	.driver		= {
144 		.name	= "ab8500-poweron-key",
145 		.owner	= THIS_MODULE,
146 		.of_match_table = of_match_ptr(ab8500_ponkey_match),
147 	},
148 	.probe		= ab8500_ponkey_probe,
149 	.remove		= __devexit_p(ab8500_ponkey_remove),
150 };
151 module_platform_driver(ab8500_ponkey_driver);
152 
153 MODULE_LICENSE("GPL v2");
154 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
155 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
156