treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[muen/linux.git] / drivers / input / misc / pcf50633-input.c
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
25 struct pcf50633_input {
26         struct pcf50633 *pcf;
27         struct input_dev *input_dev;
28 };
29
30 static void
31 pcf50633_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
50 static 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
90 static int 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         return 0;
101 }
102
103 static struct platform_driver pcf50633_input_driver = {
104         .driver = {
105                 .name = "pcf50633-input",
106         },
107         .probe = pcf50633_input_probe,
108         .remove = pcf50633_input_remove,
109 };
110 module_platform_driver(pcf50633_input_driver);
111
112 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
113 MODULE_DESCRIPTION("PCF50633 input driver");
114 MODULE_LICENSE("GPL");
115 MODULE_ALIAS("platform:pcf50633-input");