1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Input driver for PCAP events:
4*4882a593Smuzhiyun * * Power key
5*4882a593Smuzhiyun * * Headphone button
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/interrupt.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <linux/input.h>
14*4882a593Smuzhiyun #include <linux/mfd/ezx-pcap.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct pcap_keys {
18*4882a593Smuzhiyun struct pcap_chip *pcap;
19*4882a593Smuzhiyun struct input_dev *input;
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* PCAP2 interrupts us on keypress */
pcap_keys_handler(int irq,void * _pcap_keys)23*4882a593Smuzhiyun static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct pcap_keys *pcap_keys = _pcap_keys;
26*4882a593Smuzhiyun int pirq = irq_to_pcap(pcap_keys->pcap, irq);
27*4882a593Smuzhiyun u32 pstat;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
30*4882a593Smuzhiyun pstat &= 1 << pirq;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun switch (pirq) {
33*4882a593Smuzhiyun case PCAP_IRQ_ONOFF:
34*4882a593Smuzhiyun input_report_key(pcap_keys->input, KEY_POWER, !pstat);
35*4882a593Smuzhiyun break;
36*4882a593Smuzhiyun case PCAP_IRQ_MIC:
37*4882a593Smuzhiyun input_report_key(pcap_keys->input, KEY_HP, !pstat);
38*4882a593Smuzhiyun break;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun input_sync(pcap_keys->input);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun return IRQ_HANDLED;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
pcap_keys_probe(struct platform_device * pdev)46*4882a593Smuzhiyun static int pcap_keys_probe(struct platform_device *pdev)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun int err = -ENOMEM;
49*4882a593Smuzhiyun struct pcap_keys *pcap_keys;
50*4882a593Smuzhiyun struct input_dev *input_dev;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
53*4882a593Smuzhiyun if (!pcap_keys)
54*4882a593Smuzhiyun return err;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun input_dev = input_allocate_device();
59*4882a593Smuzhiyun if (!input_dev)
60*4882a593Smuzhiyun goto fail;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun pcap_keys->input = input_dev;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun platform_set_drvdata(pdev, pcap_keys);
65*4882a593Smuzhiyun input_dev->name = pdev->name;
66*4882a593Smuzhiyun input_dev->phys = "pcap-keys/input0";
67*4882a593Smuzhiyun input_dev->id.bustype = BUS_HOST;
68*4882a593Smuzhiyun input_dev->dev.parent = &pdev->dev;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun __set_bit(EV_KEY, input_dev->evbit);
71*4882a593Smuzhiyun __set_bit(KEY_POWER, input_dev->keybit);
72*4882a593Smuzhiyun __set_bit(KEY_HP, input_dev->keybit);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun err = input_register_device(input_dev);
75*4882a593Smuzhiyun if (err)
76*4882a593Smuzhiyun goto fail_allocate;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
79*4882a593Smuzhiyun pcap_keys_handler, 0, "Power key", pcap_keys);
80*4882a593Smuzhiyun if (err)
81*4882a593Smuzhiyun goto fail_register;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
84*4882a593Smuzhiyun pcap_keys_handler, 0, "Headphone button", pcap_keys);
85*4882a593Smuzhiyun if (err)
86*4882a593Smuzhiyun goto fail_pwrkey;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun return 0;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun fail_pwrkey:
91*4882a593Smuzhiyun free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
92*4882a593Smuzhiyun fail_register:
93*4882a593Smuzhiyun input_unregister_device(input_dev);
94*4882a593Smuzhiyun goto fail;
95*4882a593Smuzhiyun fail_allocate:
96*4882a593Smuzhiyun input_free_device(input_dev);
97*4882a593Smuzhiyun fail:
98*4882a593Smuzhiyun kfree(pcap_keys);
99*4882a593Smuzhiyun return err;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
pcap_keys_remove(struct platform_device * pdev)102*4882a593Smuzhiyun static int pcap_keys_remove(struct platform_device *pdev)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
107*4882a593Smuzhiyun free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun input_unregister_device(pcap_keys->input);
110*4882a593Smuzhiyun kfree(pcap_keys);
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun return 0;
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun static struct platform_driver pcap_keys_device_driver = {
116*4882a593Smuzhiyun .probe = pcap_keys_probe,
117*4882a593Smuzhiyun .remove = pcap_keys_remove,
118*4882a593Smuzhiyun .driver = {
119*4882a593Smuzhiyun .name = "pcap-keys",
120*4882a593Smuzhiyun }
121*4882a593Smuzhiyun };
122*4882a593Smuzhiyun module_platform_driver(pcap_keys_device_driver);
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
125*4882a593Smuzhiyun MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
126*4882a593Smuzhiyun MODULE_LICENSE("GPL");
127*4882a593Smuzhiyun MODULE_ALIAS("platform:pcap_keys");
128