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		.owner	= THIS_MODULE,
125	}
126};
127module_platform_driver(pcap_keys_device_driver);
128
129MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
130MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
131MODULE_LICENSE("GPL");
132MODULE_ALIAS("platform:pcap_keys");
133