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 | |
21 | struct pcap_keys { |
22 | struct pcap_chip *pcap; |
23 | struct input_dev *input; |
24 | }; |
25 | |
26 | /* PCAP2 interrupts us on keypress */ |
27 | static 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 | |
50 | static 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 | |
94 | fail_pwrkey: |
95 | free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); |
96 | fail_register: |
97 | input_unregister_device(input_dev); |
98 | goto fail; |
99 | fail_allocate: |
100 | input_free_device(input_dev); |
101 | fail: |
102 | kfree(pcap_keys); |
103 | return err; |
104 | } |
105 | |
106 | static 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 | |
119 | static 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 | }; |
126 | module_platform_driver(pcap_keys_device_driver); |
127 | |
128 | MODULE_DESCRIPTION("Motorola PCAP2 input events driver" ); |
129 | MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>" ); |
130 | MODULE_LICENSE("GPL" ); |
131 | MODULE_ALIAS("platform:pcap_keys" ); |
132 | |