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