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 | |
23 | struct ipaq_micro_keys { |
24 | struct ipaq_micro *micro; |
25 | struct input_dev *input; |
26 | u16 *codes; |
27 | }; |
28 | |
29 | static 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 | |
41 | static 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 | |
55 | static void micro_key_start(struct ipaq_micro_keys *keys) |
56 | { |
57 | spin_lock(lock: &keys->micro->lock); |
58 | keys->micro->key = micro_key_receive; |
59 | keys->micro->key_data = keys; |
60 | spin_unlock(lock: &keys->micro->lock); |
61 | } |
62 | |
63 | static void micro_key_stop(struct ipaq_micro_keys *keys) |
64 | { |
65 | spin_lock(lock: &keys->micro->lock); |
66 | keys->micro->key = NULL; |
67 | keys->micro->key_data = NULL; |
68 | spin_unlock(lock: &keys->micro->lock); |
69 | } |
70 | |
71 | static 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 | |
80 | static 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 | |
87 | static 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(dev: &pdev->dev, src: micro_keycodes, |
106 | len: keys->input->keycodesize * keys->input->keycodemax, |
107 | GFP_KERNEL); |
108 | keys->input->keycode = keys->codes; |
109 | |
110 | __set_bit(EV_KEY, keys->input->evbit); |
111 | for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++) |
112 | __set_bit(micro_keycodes[i], keys->input->keybit); |
113 | |
114 | keys->input->name = "h3600 micro keys" ; |
115 | keys->input->open = micro_key_open; |
116 | keys->input->close = micro_key_close; |
117 | input_set_drvdata(dev: keys->input, data: keys); |
118 | |
119 | error = input_register_device(keys->input); |
120 | if (error) |
121 | return error; |
122 | |
123 | platform_set_drvdata(pdev, data: keys); |
124 | return 0; |
125 | } |
126 | |
127 | static int micro_key_suspend(struct device *dev) |
128 | { |
129 | struct ipaq_micro_keys *keys = dev_get_drvdata(dev); |
130 | |
131 | micro_key_stop(keys); |
132 | |
133 | return 0; |
134 | } |
135 | |
136 | static int micro_key_resume(struct device *dev) |
137 | { |
138 | struct ipaq_micro_keys *keys = dev_get_drvdata(dev); |
139 | struct input_dev *input = keys->input; |
140 | |
141 | mutex_lock(&input->mutex); |
142 | |
143 | if (input_device_enabled(dev: input)) |
144 | micro_key_start(keys); |
145 | |
146 | mutex_unlock(lock: &input->mutex); |
147 | |
148 | return 0; |
149 | } |
150 | |
151 | static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops, |
152 | micro_key_suspend, micro_key_resume); |
153 | |
154 | static struct platform_driver micro_key_device_driver = { |
155 | .driver = { |
156 | .name = "ipaq-micro-keys" , |
157 | .pm = pm_sleep_ptr(µ_key_dev_pm_ops), |
158 | }, |
159 | .probe = micro_key_probe, |
160 | }; |
161 | module_platform_driver(micro_key_device_driver); |
162 | |
163 | MODULE_LICENSE("GPL" ); |
164 | MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys" ); |
165 | MODULE_ALIAS("platform:ipaq-micro-keys" ); |
166 | |