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/device.h>
20#include <linux/platform_device.h>
21#include <linux/input.h>
22#include <linux/slab.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
30struct pcf50633_input {
31 struct pcf50633 *pcf;
32 struct input_dev *input_dev;
33};
34
35static void
36pcf50633_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
55static int pcf50633_input_probe(struct platform_device *pdev)
56{
57 struct pcf50633_input *input;
58 struct input_dev *input_dev;
59 int ret;
60
61
62 input = kzalloc(sizeof(*input), GFP_KERNEL);
63 if (!input)
64 return -ENOMEM;
65
66 input_dev = input_allocate_device();
67 if (!input_dev) {
68 kfree(input);
69 return -ENOMEM;
70 }
71
72 platform_set_drvdata(pdev, input);
73 input->pcf = dev_to_pcf50633(pdev->dev.parent);
74 input->input_dev = input_dev;
75
76 input_dev->name = "PCF50633 PMU events";
77 input_dev->id.bustype = BUS_I2C;
78 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
79 set_bit(KEY_POWER, input_dev->keybit);
80
81 ret = input_register_device(input_dev);
82 if (ret) {
83 input_free_device(input_dev);
84 kfree(input);
85 return ret;
86 }
87 pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
88 pcf50633_input_irq, input);
89 pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
90 pcf50633_input_irq, input);
91
92 return 0;
93}
94
95static int pcf50633_input_remove(struct platform_device *pdev)
96{
97 struct pcf50633_input *input = platform_get_drvdata(pdev);
98
99 pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
100 pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
101
102 input_unregister_device(input->input_dev);
103 kfree(input);
104
105 return 0;
106}
107
108static struct platform_driver pcf50633_input_driver = {
109 .driver = {
110 .name = "pcf50633-input",
111 },
112 .probe = pcf50633_input_probe,
113 .remove = pcf50633_input_remove,
114};
115module_platform_driver(pcf50633_input_driver);
116
117MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
118MODULE_DESCRIPTION("PCF50633 input driver");
119MODULE_LICENSE("GPL");
120MODULE_ALIAS("platform:pcf50633-input");
121