039dcb00ebd96250efea2a7b5903cb4521dee60f
[kernel.git] / drivers / input / misc / pcf50633-input.c
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
24 #include <linux/mfd/pcf50633/core.h>
25
26 #define PCF50633_OOCSTAT_ONKEY  0x01
27 #define PCF50633_REG_OOCSTAT    0x12
28 #define PCF50633_REG_OOCMODE    0x10
29
30 struct pcf50633_input {
31         struct pcf50633 *pcf;
32         struct input_dev *input_dev;
33 };
34
35 static void
36 pcf50633_input_irq(int irq, void *data)
37 {
38         struct pcf50633_input *input;
39         int onkey_released;
40
41         input = data;
42
43         /* We report only one event depending on the key press status */
44         onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
45                                                 & PCF50633_OOCSTAT_ONKEY;
46
47         if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
48                 input_report_key(input->input_dev, KEY_POWER, 1);
49         else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
50                 input_report_key(input->input_dev, KEY_POWER, 0);
51
52         input_sync(input->input_dev);
53 }
54
55 static int __devinit pcf50633_input_probe(struct platform_device *pdev)
56 {
57         struct pcf50633_input *input;
58         struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
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 = pdata->pcf;
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(pdata->pcf, PCF50633_IRQ_ONKEYR,
89                                 pcf50633_input_irq, input);
90         pcf50633_register_irq(pdata->pcf, PCF50633_IRQ_ONKEYF,
91                                 pcf50633_input_irq, input);
92
93         return 0;
94 }
95
96 static int __devexit 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 = __devexit_p(pcf50633_input_remove),
115 };
116
117 static int __init pcf50633_input_init(void)
118 {
119         return platform_driver_register(&pcf50633_input_driver);
120 }
121 module_init(pcf50633_input_init);
122
123 static void __exit pcf50633_input_exit(void)
124 {
125         platform_driver_unregister(&pcf50633_input_driver);
126 }
127 module_exit(pcf50633_input_exit);
128
129 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
130 MODULE_DESCRIPTION("PCF50633 input driver");
131 MODULE_LICENSE("GPL");
132 MODULE_ALIAS("platform:pcf50633-input");