1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * h3600 atmel micro companion support, key subdevice
5 * based on previous kernel 2.4 version
6 * Author : Alessandro Gardich <gremlin@gremlin.it>
7 * Author : Linus Walleij <linus.walleij@linaro.org>
8 */
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/fs.h>
12#include <linux/interrupt.h>
13#include <linux/sched.h>
14#include <linux/pm.h>
15#include <linux/sysctl.h>
16#include <linux/proc_fs.h>
17#include <linux/delay.h>
18#include <linux/device.h>
19#include <linux/input.h>
20#include <linux/platform_device.h>
21#include <linux/mfd/ipaq-micro.h>
22
23struct ipaq_micro_keys {
24 struct ipaq_micro *micro;
25 struct input_dev *input;
26 u16 *codes;
27};
28
29static const u16 micro_keycodes[] = {
30 KEY_RECORD, /* 1: Record button */
31 KEY_CALENDAR, /* 2: Calendar */
32 KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */
33 KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */
34 KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */
35 KEY_UP, /* 6: Up */
36 KEY_RIGHT, /* 7: Right */
37 KEY_LEFT, /* 8: Left */
38 KEY_DOWN, /* 9: Down */
39};
40
41static void micro_key_receive(void *data, int len, unsigned char *msg)
42{
43 struct ipaq_micro_keys *keys = data;
44 int key, down;
45
46 down = 0x80 & msg[0];
47 key = 0x7f & msg[0];
48
49 if (key < ARRAY_SIZE(micro_keycodes)) {
50 input_report_key(dev: keys->input, code: keys->codes[key], value: down);
51 input_sync(dev: keys->input);
52 }
53}
54
55static void micro_key_start(struct ipaq_micro_keys *keys)
56{
57 guard(spinlock)(l: &keys->micro->lock);
58
59 keys->micro->key = micro_key_receive;
60 keys->micro->key_data = keys;
61}
62
63static void micro_key_stop(struct ipaq_micro_keys *keys)
64{
65 guard(spinlock)(l: &keys->micro->lock);
66
67 keys->micro->key = NULL;
68 keys->micro->key_data = NULL;
69}
70
71static int micro_key_open(struct input_dev *input)
72{
73 struct ipaq_micro_keys *keys = input_get_drvdata(dev: input);
74
75 micro_key_start(keys);
76
77 return 0;
78}
79
80static void micro_key_close(struct input_dev *input)
81{
82 struct ipaq_micro_keys *keys = input_get_drvdata(dev: input);
83
84 micro_key_stop(keys);
85}
86
87static int micro_key_probe(struct platform_device *pdev)
88{
89 struct ipaq_micro_keys *keys;
90 int error;
91 int i;
92
93 keys = devm_kzalloc(dev: &pdev->dev, size: sizeof(*keys), GFP_KERNEL);
94 if (!keys)
95 return -ENOMEM;
96
97 keys->micro = dev_get_drvdata(dev: pdev->dev.parent);
98
99 keys->input = devm_input_allocate_device(&pdev->dev);
100 if (!keys->input)
101 return -ENOMEM;
102
103 keys->input->keycodesize = sizeof(micro_keycodes[0]);
104 keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
105 keys->codes = devm_kmemdup_array(dev: &pdev->dev, src: micro_keycodes, n: keys->input->keycodemax,
106 size: keys->input->keycodesize, GFP_KERNEL);
107 if (!keys->codes)
108 return -ENOMEM;
109
110 keys->input->keycode = keys->codes;
111
112 __set_bit(EV_KEY, keys->input->evbit);
113 for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
114 __set_bit(micro_keycodes[i], keys->input->keybit);
115
116 keys->input->name = "h3600 micro keys";
117 keys->input->open = micro_key_open;
118 keys->input->close = micro_key_close;
119 input_set_drvdata(dev: keys->input, data: keys);
120
121 error = input_register_device(keys->input);
122 if (error)
123 return error;
124
125 platform_set_drvdata(pdev, data: keys);
126 return 0;
127}
128
129static int micro_key_suspend(struct device *dev)
130{
131 struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
132
133 micro_key_stop(keys);
134
135 return 0;
136}
137
138static int micro_key_resume(struct device *dev)
139{
140 struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
141 struct input_dev *input = keys->input;
142
143 guard(mutex)(T: &input->mutex);
144
145 if (input_device_enabled(dev: input))
146 micro_key_start(keys);
147
148 return 0;
149}
150
151static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
152 micro_key_suspend, micro_key_resume);
153
154static struct platform_driver micro_key_device_driver = {
155 .driver = {
156 .name = "ipaq-micro-keys",
157 .pm = pm_sleep_ptr(&micro_key_dev_pm_ops),
158 },
159 .probe = micro_key_probe,
160};
161module_platform_driver(micro_key_device_driver);
162
163MODULE_LICENSE("GPL");
164MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
165MODULE_ALIAS("platform:ipaq-micro-keys");
166

source code of linux/drivers/input/keyboard/ipaq-micro-keys.c