1// SPDX-License-Identifier: GPL-2.0-or-later
2/* NXP PCF50633 Input Driver
3 *
4 * (C) 2006-2008 by Openmoko, Inc.
5 * Author: Balaji Rao <balajirrao@openmoko.org>
6 * All rights reserved.
7 *
8 * Broken down from monstrous PCF50633 driver mainly by
9 * Harald Welte, Andy Green and Werner Almesberger
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/platform_device.h>
16#include <linux/input.h>
17#include <linux/slab.h>
18
19#include <linux/mfd/pcf50633/core.h>
20
21#define PCF50633_OOCSTAT_ONKEY	0x01
22#define PCF50633_REG_OOCSTAT	0x12
23#define PCF50633_REG_OOCMODE	0x10
24
25struct pcf50633_input {
26	struct pcf50633 *pcf;
27	struct input_dev *input_dev;
28};
29
30static void
31pcf50633_input_irq(int irq, void *data)
32{
33	struct pcf50633_input *input;
34	int onkey_released;
35
36	input = data;
37
38	/* We report only one event depending on the key press status */
39	onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
40						& PCF50633_OOCSTAT_ONKEY;
41
42	if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
43		input_report_key(input->input_dev, KEY_POWER, 1);
44	else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
45		input_report_key(input->input_dev, KEY_POWER, 0);
46
47	input_sync(input->input_dev);
48}
49
50static int pcf50633_input_probe(struct platform_device *pdev)
51{
52	struct pcf50633_input *input;
53	struct input_dev *input_dev;
54	int ret;
55
56
57	input = kzalloc(sizeof(*input), GFP_KERNEL);
58	if (!input)
59		return -ENOMEM;
60
61	input_dev = input_allocate_device();
62	if (!input_dev) {
63		kfree(input);
64		return -ENOMEM;
65	}
66
67	platform_set_drvdata(pdev, input);
68	input->pcf = dev_to_pcf50633(pdev->dev.parent);
69	input->input_dev = input_dev;
70
71	input_dev->name = "PCF50633 PMU events";
72	input_dev->id.bustype = BUS_I2C;
73	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
74	set_bit(KEY_POWER, input_dev->keybit);
75
76	ret = input_register_device(input_dev);
77	if (ret) {
78		input_free_device(input_dev);
79		kfree(input);
80		return ret;
81	}
82	pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
83				pcf50633_input_irq, input);
84	pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
85				pcf50633_input_irq, input);
86
87	return 0;
88}
89
90static void pcf50633_input_remove(struct platform_device *pdev)
91{
92	struct pcf50633_input *input  = platform_get_drvdata(pdev);
93
94	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
95	pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
96
97	input_unregister_device(input->input_dev);
98	kfree(input);
99}
100
101static struct platform_driver pcf50633_input_driver = {
102	.driver = {
103		.name = "pcf50633-input",
104	},
105	.probe = pcf50633_input_probe,
106	.remove_new = pcf50633_input_remove,
107};
108module_platform_driver(pcf50633_input_driver);
109
110MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
111MODULE_DESCRIPTION("PCF50633 input driver");
112MODULE_LICENSE("GPL");
113MODULE_ALIAS("platform:pcf50633-input");
114