1/*
2 * Input driver for PCAP events:
3 * * Power key
4 * * Headphone button
5 *
6 * Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/interrupt.h>
16#include <linux/platform_device.h>
17#include <linux/input.h>
18#include <linux/mfd/ezx-pcap.h>
19#include <linux/slab.h>
20
21struct pcap_keys {
22 struct pcap_chip *pcap;
23 struct input_dev *input;
24};
25
26/* PCAP2 interrupts us on keypress */
27static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
28{
29 struct pcap_keys *pcap_keys = _pcap_keys;
30 int pirq = irq_to_pcap(pcap_keys->pcap, irq);
31 u32 pstat;
32
33 ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
34 pstat &= 1 << pirq;
35
36 switch (pirq) {
37 case PCAP_IRQ_ONOFF:
38 input_report_key(pcap_keys->input, KEY_POWER, !pstat);
39 break;
40 case PCAP_IRQ_MIC:
41 input_report_key(pcap_keys->input, KEY_HP, !pstat);
42 break;
43 }
44
45 input_sync(pcap_keys->input);
46
47 return IRQ_HANDLED;
48}
49
50static int pcap_keys_probe(struct platform_device *pdev)
51{
52 int err = -ENOMEM;
53 struct pcap_keys *pcap_keys;
54 struct input_dev *input_dev;
55
56 pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
57 if (!pcap_keys)
58 return err;
59
60 pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
61
62 input_dev = input_allocate_device();
63 if (!input_dev)
64 goto fail;
65
66 pcap_keys->input = input_dev;
67
68 platform_set_drvdata(pdev, pcap_keys);
69 input_dev->name = pdev->name;
70 input_dev->phys = "pcap-keys/input0";
71 input_dev->id.bustype = BUS_HOST;
72 input_dev->dev.parent = &pdev->dev;
73
74 __set_bit(EV_KEY, input_dev->evbit);
75 __set_bit(KEY_POWER, input_dev->keybit);
76 __set_bit(KEY_HP, input_dev->keybit);
77
78 err = input_register_device(input_dev);
79 if (err)
80 goto fail_allocate;
81
82 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
83 pcap_keys_handler, 0, "Power key", pcap_keys);
84 if (err)
85 goto fail_register;
86
87 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
88 pcap_keys_handler, 0, "Headphone button", pcap_keys);
89 if (err)
90 goto fail_pwrkey;
91
92 return 0;
93
94fail_pwrkey:
95 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
96fail_register:
97 input_unregister_device(input_dev);
98 goto fail;
99fail_allocate:
100 input_free_device(input_dev);
101fail:
102 kfree(pcap_keys);
103 return err;
104}
105
106static int pcap_keys_remove(struct platform_device *pdev)
107{
108 struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
109
110 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
111 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
112
113 input_unregister_device(pcap_keys->input);
114 kfree(pcap_keys);
115
116 return 0;
117}
118
119static struct platform_driver pcap_keys_device_driver = {
120 .probe = pcap_keys_probe,
121 .remove = pcap_keys_remove,
122 .driver = {
123 .name = "pcap-keys",
124 }
125};
126module_platform_driver(pcap_keys_device_driver);
127
128MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
129MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
130MODULE_LICENSE("GPL");
131MODULE_ALIAS("platform:pcap_keys");
132