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 
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 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 
95 static 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 
108 static struct platform_driver pcf50633_input_driver = {
109 	.driver = {
110 		.name = "pcf50633-input",
111 	},
112 	.probe = pcf50633_input_probe,
113 	.remove = pcf50633_input_remove,
114 };
115 module_platform_driver(pcf50633_input_driver);
116 
117 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
118 MODULE_DESCRIPTION("PCF50633 input driver");
119 MODULE_LICENSE("GPL");
120 MODULE_ALIAS("platform:pcf50633-input");
121