1 /* NXP PCF50633 Input Driver
2  *
3  * (C) 2006-2008 by Openmoko, Inc.
4  * Author: Balaji Rao <balajirrao@openmoko.org>
5  * All rights reserved.
6  *
7  * Broken down from monstrous PCF50633 driver mainly by
8  * Harald Welte, Andy Green and Werner Almesberger
9  *
10  *  This program is free software; you can redistribute  it and/or modify it
11  *  under  the terms of  the GNU General  Public License as published by the
12  *  Free Software Foundation;  either version 2 of the  License, or (at your
13  *  option) any later version.
14  *
15  */
16 
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/platform_device.h>
22 #include <linux/input.h>
23 #include <linux/slab.h>
24 
25 #include <linux/mfd/pcf50633/core.h>
26 
27 #define PCF50633_OOCSTAT_ONKEY	0x01
28 #define PCF50633_REG_OOCSTAT	0x12
29 #define PCF50633_REG_OOCMODE	0x10
30 
31 struct pcf50633_input {
32 	struct pcf50633 *pcf;
33 	struct input_dev *input_dev;
34 };
35 
36 static void
37 pcf50633_input_irq(int irq, void *data)
38 {
39 	struct pcf50633_input *input;
40 	int onkey_released;
41 
42 	input = data;
43 
44 	/* We report only one event depending on the key press status */
45 	onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
46 						& PCF50633_OOCSTAT_ONKEY;
47 
48 	if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
49 		input_report_key(input->input_dev, KEY_POWER, 1);
50 	else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
51 		input_report_key(input->input_dev, KEY_POWER, 0);
52 
53 	input_sync(input->input_dev);
54 }
55 
56 static int pcf50633_input_probe(struct platform_device *pdev)
57 {
58 	struct pcf50633_input *input;
59 	struct input_dev *input_dev;
60 	int ret;
61 
62 
63 	input = kzalloc(sizeof(*input), GFP_KERNEL);
64 	if (!input)
65 		return -ENOMEM;
66 
67 	input_dev = input_allocate_device();
68 	if (!input_dev) {
69 		kfree(input);
70 		return -ENOMEM;
71 	}
72 
73 	platform_set_drvdata(pdev, input);
74 	input->pcf = dev_to_pcf50633(pdev->dev.parent);
75 	input->input_dev = input_dev;
76 
77 	input_dev->name = "PCF50633 PMU events";
78 	input_dev->id.bustype = BUS_I2C;
79 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
80 	set_bit(KEY_POWER, input_dev->keybit);
81 
82 	ret = input_register_device(input_dev);
83 	if (ret) {
84 		input_free_device(input_dev);
85 		kfree(input);
86 		return ret;
87 	}
88 	pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
89 				pcf50633_input_irq, input);
90 	pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
91 				pcf50633_input_irq, input);
92 
93 	return 0;
94 }
95 
96 static int pcf50633_input_remove(struct platform_device *pdev)
97 {
98 	struct pcf50633_input *input  = platform_get_drvdata(pdev);
99 
100 	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
101 	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
102 
103 	input_unregister_device(input->input_dev);
104 	kfree(input);
105 
106 	return 0;
107 }
108 
109 static struct platform_driver pcf50633_input_driver = {
110 	.driver = {
111 		.name = "pcf50633-input",
112 	},
113 	.probe = pcf50633_input_probe,
114 	.remove = pcf50633_input_remove,
115 };
116 module_platform_driver(pcf50633_input_driver);
117 
118 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
119 MODULE_DESCRIPTION("PCF50633 input driver");
120 MODULE_LICENSE("GPL");
121 MODULE_ALIAS("platform:pcf50633-input");
122