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d7535ffa LW |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * h3600 atmel micro companion support, key subdevice | |
7 | * based on previous kernel 2.4 version | |
8 | * Author : Alessandro Gardich <gremlin@gremlin.it> | |
9 | * Author : Linus Walleij <linus.walleij@linaro.org> | |
10 | * | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/pm.h> | |
18 | #include <linux/sysctl.h> | |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/input.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/mfd/ipaq-micro.h> | |
25 | ||
26 | struct ipaq_micro_keys { | |
27 | struct ipaq_micro *micro; | |
28 | struct input_dev *input; | |
29 | u16 *codes; | |
30 | }; | |
31 | ||
32 | static const u16 micro_keycodes[] = { | |
33 | KEY_RECORD, /* 1: Record button */ | |
34 | KEY_CALENDAR, /* 2: Calendar */ | |
35 | KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */ | |
36 | KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */ | |
37 | KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */ | |
38 | KEY_UP, /* 6: Up */ | |
39 | KEY_RIGHT, /* 7: Right */ | |
40 | KEY_LEFT, /* 8: Left */ | |
41 | KEY_DOWN, /* 9: Down */ | |
42 | }; | |
43 | ||
44 | static void micro_key_receive(void *data, int len, unsigned char *msg) | |
45 | { | |
46 | struct ipaq_micro_keys *keys = data; | |
47 | int key, down; | |
48 | ||
49 | down = 0x80 & msg[0]; | |
50 | key = 0x7f & msg[0]; | |
51 | ||
52 | if (key < ARRAY_SIZE(micro_keycodes)) { | |
53 | input_report_key(keys->input, keys->codes[key], down); | |
54 | input_sync(keys->input); | |
55 | } | |
56 | } | |
57 | ||
58 | static void micro_key_start(struct ipaq_micro_keys *keys) | |
59 | { | |
60 | spin_lock(&keys->micro->lock); | |
61 | keys->micro->key = micro_key_receive; | |
62 | keys->micro->key_data = keys; | |
63 | spin_unlock(&keys->micro->lock); | |
64 | } | |
65 | ||
66 | static void micro_key_stop(struct ipaq_micro_keys *keys) | |
67 | { | |
68 | spin_lock(&keys->micro->lock); | |
69 | keys->micro->key = NULL; | |
70 | keys->micro->key_data = NULL; | |
71 | spin_unlock(&keys->micro->lock); | |
72 | } | |
73 | ||
74 | static int micro_key_open(struct input_dev *input) | |
75 | { | |
76 | struct ipaq_micro_keys *keys = input_get_drvdata(input); | |
77 | ||
78 | micro_key_start(keys); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static void micro_key_close(struct input_dev *input) | |
84 | { | |
85 | struct ipaq_micro_keys *keys = input_get_drvdata(input); | |
86 | ||
87 | micro_key_stop(keys); | |
88 | } | |
89 | ||
90 | static int micro_key_probe(struct platform_device *pdev) | |
91 | { | |
92 | struct ipaq_micro_keys *keys; | |
93 | int error; | |
94 | int i; | |
95 | ||
96 | keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL); | |
97 | if (!keys) | |
98 | return -ENOMEM; | |
99 | ||
100 | keys->micro = dev_get_drvdata(pdev->dev.parent); | |
101 | ||
102 | keys->input = devm_input_allocate_device(&pdev->dev); | |
103 | if (!keys->input) | |
104 | return -ENOMEM; | |
105 | ||
106 | keys->input->keycodesize = sizeof(micro_keycodes[0]); | |
107 | keys->input->keycodemax = ARRAY_SIZE(micro_keycodes); | |
108 | keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes, | |
109 | keys->input->keycodesize * keys->input->keycodemax, | |
110 | GFP_KERNEL); | |
111 | keys->input->keycode = keys->codes; | |
112 | ||
113 | __set_bit(EV_KEY, keys->input->evbit); | |
114 | for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++) | |
115 | __set_bit(micro_keycodes[i], keys->input->keybit); | |
116 | ||
117 | keys->input->name = "h3600 micro keys"; | |
118 | keys->input->open = micro_key_open; | |
119 | keys->input->close = micro_key_close; | |
120 | input_set_drvdata(keys->input, keys); | |
121 | ||
122 | error = input_register_device(keys->input); | |
123 | if (error) | |
124 | return error; | |
125 | ||
126 | platform_set_drvdata(pdev, keys); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int __maybe_unused micro_key_suspend(struct device *dev) | |
131 | { | |
132 | struct ipaq_micro_keys *keys = dev_get_drvdata(dev); | |
133 | ||
134 | micro_key_stop(keys); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int __maybe_unused micro_key_resume(struct device *dev) | |
140 | { | |
141 | struct ipaq_micro_keys *keys = dev_get_drvdata(dev); | |
142 | struct input_dev *input = keys->input; | |
143 | ||
144 | mutex_lock(&input->mutex); | |
145 | ||
146 | if (input->users) | |
147 | micro_key_start(keys); | |
148 | ||
149 | mutex_unlock(&input->mutex); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops, | |
155 | micro_key_suspend, micro_key_resume); | |
156 | ||
157 | static struct platform_driver micro_key_device_driver = { | |
158 | .driver = { | |
159 | .name = "ipaq-micro-keys", | |
160 | .pm = µ_key_dev_pm_ops, | |
161 | }, | |
162 | .probe = micro_key_probe, | |
163 | }; | |
164 | module_platform_driver(micro_key_device_driver); | |
165 | ||
166 | MODULE_LICENSE("GPL"); | |
167 | MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys"); | |
168 | MODULE_ALIAS("platform:ipaq-micro-keys"); |