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1 | /* |
2 | * drivers/macintosh/mac_hid.c |
3 | * |
4 | * HID support stuff for Macintosh computers. |
5 | * |
6 | * Copyright (C) 2000 Franz Sirl. |
7 | * |
8 | * This file will soon be removed in favor of an uinput userspace tool. |
9 | */ |
10 | |
11 | #include <linux/init.h> |
12 | #include <linux/proc_fs.h> |
13 | #include <linux/sysctl.h> |
14 | #include <linux/input.h> |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> |
17 | |
18 | MODULE_LICENSE("GPL"); |
19 | |
20 | static int mouse_emulate_buttons; |
21 | static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ |
22 | static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ |
23 | |
24 | static struct input_dev *mac_hid_emumouse_dev; |
25 | |
26 | static DEFINE_MUTEX(mac_hid_emumouse_mutex); |
27 | |
28 | static int mac_hid_create_emumouse(void) |
29 | { |
30 | static struct lock_class_key mac_hid_emumouse_dev_event_class; |
31 | static struct lock_class_key mac_hid_emumouse_dev_mutex_class; |
32 | int err; |
33 | |
34 | mac_hid_emumouse_dev = input_allocate_device(); |
35 | if (!mac_hid_emumouse_dev) |
36 | return -ENOMEM; |
37 | |
38 | lockdep_set_class(&mac_hid_emumouse_dev->event_lock, |
39 | &mac_hid_emumouse_dev_event_class); |
40 | lockdep_set_class(&mac_hid_emumouse_dev->mutex, |
41 | &mac_hid_emumouse_dev_mutex_class); |
42 | |
43 | mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; |
44 | mac_hid_emumouse_dev->id.bustype = BUS_ADB; |
45 | mac_hid_emumouse_dev->id.vendor = 0x0001; |
46 | mac_hid_emumouse_dev->id.product = 0x0001; |
47 | mac_hid_emumouse_dev->id.version = 0x0100; |
48 | |
49 | mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); |
50 | mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = |
51 | BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); |
52 | mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); |
53 | |
54 | err = input_register_device(mac_hid_emumouse_dev); |
55 | if (err) { |
56 | input_free_device(mac_hid_emumouse_dev); |
57 | mac_hid_emumouse_dev = NULL; |
58 | return err; |
59 | } |
60 | |
61 | return 0; |
62 | } |
63 | |
64 | static void mac_hid_destroy_emumouse(void) |
65 | { |
66 | input_unregister_device(mac_hid_emumouse_dev); |
67 | mac_hid_emumouse_dev = NULL; |
68 | } |
69 | |
70 | static bool mac_hid_emumouse_filter(struct input_handle *handle, |
71 | unsigned int type, unsigned int code, |
72 | int value) |
73 | { |
74 | unsigned int btn; |
75 | |
76 | if (type != EV_KEY) |
77 | return false; |
78 | |
79 | if (code == mouse_button2_keycode) |
80 | btn = BTN_MIDDLE; |
81 | else if (code == mouse_button3_keycode) |
82 | btn = BTN_RIGHT; |
83 | else |
84 | return false; |
85 | |
86 | input_report_key(mac_hid_emumouse_dev, btn, value); |
87 | input_sync(mac_hid_emumouse_dev); |
88 | |
89 | return true; |
90 | } |
91 | |
92 | static int mac_hid_emumouse_connect(struct input_handler *handler, |
93 | struct input_dev *dev, |
94 | const struct input_device_id *id) |
95 | { |
96 | struct input_handle *handle; |
97 | int error; |
98 | |
99 | /* Don't bind to ourselves */ |
100 | if (dev == mac_hid_emumouse_dev) |
101 | return -ENODEV; |
102 | |
103 | handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); |
104 | if (!handle) |
105 | return -ENOMEM; |
106 | |
107 | handle->dev = dev; |
108 | handle->handler = handler; |
109 | handle->name = "mac-button-emul"; |
110 | |
111 | error = input_register_handle(handle); |
112 | if (error) { |
113 | printk(KERN_ERR |
114 | "mac_hid: Failed to register button emulation handle, " |
115 | "error %d\n", error); |
116 | goto err_free; |
117 | } |
118 | |
119 | error = input_open_device(handle); |
120 | if (error) { |
121 | printk(KERN_ERR |
122 | "mac_hid: Failed to open input device, error %d\n", |
123 | error); |
124 | goto err_unregister; |
125 | } |
126 | |
127 | return 0; |
128 | |
129 | err_unregister: |
130 | input_unregister_handle(handle); |
131 | err_free: |
132 | kfree(handle); |
133 | return error; |
134 | } |
135 | |
136 | static void mac_hid_emumouse_disconnect(struct input_handle *handle) |
137 | { |
138 | input_close_device(handle); |
139 | input_unregister_handle(handle); |
140 | kfree(handle); |
141 | } |
142 | |
143 | static const struct input_device_id mac_hid_emumouse_ids[] = { |
144 | { |
145 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT, |
146 | .evbit = { BIT_MASK(EV_KEY) }, |
147 | }, |
148 | { }, |
149 | }; |
150 | |
151 | MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); |
152 | |
153 | static struct input_handler mac_hid_emumouse_handler = { |
154 | .filter = mac_hid_emumouse_filter, |
155 | .connect = mac_hid_emumouse_connect, |
156 | .disconnect = mac_hid_emumouse_disconnect, |
157 | .name = "mac-button-emul", |
158 | .id_table = mac_hid_emumouse_ids, |
159 | }; |
160 | |
161 | static int mac_hid_start_emulation(void) |
162 | { |
163 | int err; |
164 | |
165 | err = mac_hid_create_emumouse(); |
166 | if (err) |
167 | return err; |
168 | |
169 | err = input_register_handler(&mac_hid_emumouse_handler); |
170 | if (err) { |
171 | mac_hid_destroy_emumouse(); |
172 | return err; |
173 | } |
174 | |
175 | return 0; |
176 | } |
177 | |
178 | static void mac_hid_stop_emulation(void) |
179 | { |
180 | input_unregister_handler(&mac_hid_emumouse_handler); |
181 | mac_hid_destroy_emumouse(); |
182 | } |
183 | |
184 | static int mac_hid_toggle_emumouse(ctl_table *table, int write, |
185 | void __user *buffer, size_t *lenp, |
186 | loff_t *ppos) |
187 | { |
188 | int *valp = table->data; |
189 | int old_val = *valp; |
190 | int rc; |
191 | |
192 | rc = mutex_lock_killable(&mac_hid_emumouse_mutex); |
193 | if (rc) |
194 | return rc; |
195 | |
196 | rc = proc_dointvec(table, write, buffer, lenp, ppos); |
197 | |
198 | if (rc == 0 && write && *valp != old_val) { |
199 | if (*valp == 1) |
200 | rc = mac_hid_start_emulation(); |
201 | else if (*valp == 0) |
202 | mac_hid_stop_emulation(); |
203 | else |
204 | rc = -EINVAL; |
205 | } |
206 | |
207 | /* Restore the old value in case of error */ |
208 | if (rc) |
209 | *valp = old_val; |
210 | |
211 | mutex_unlock(&mac_hid_emumouse_mutex); |
212 | |
213 | return rc; |
214 | } |
215 | |
216 | /* file(s) in /proc/sys/dev/mac_hid */ |
217 | static ctl_table mac_hid_files[] = { |
218 | { |
219 | .procname = "mouse_button_emulation", |
220 | .data = &mouse_emulate_buttons, |
221 | .maxlen = sizeof(int), |
222 | .mode = 0644, |
223 | .proc_handler = mac_hid_toggle_emumouse, |
224 | }, |
225 | { |
226 | .procname = "mouse_button2_keycode", |
227 | .data = &mouse_button2_keycode, |
228 | .maxlen = sizeof(int), |
229 | .mode = 0644, |
230 | .proc_handler = proc_dointvec, |
231 | }, |
232 | { |
233 | .procname = "mouse_button3_keycode", |
234 | .data = &mouse_button3_keycode, |
235 | .maxlen = sizeof(int), |
236 | .mode = 0644, |
237 | .proc_handler = proc_dointvec, |
238 | }, |
239 | { } |
240 | }; |
241 | |
242 | /* dir in /proc/sys/dev */ |
243 | static ctl_table mac_hid_dir[] = { |
244 | { |
245 | .procname = "mac_hid", |
246 | .maxlen = 0, |
247 | .mode = 0555, |
248 | .child = mac_hid_files, |
249 | }, |
250 | { } |
251 | }; |
252 | |
253 | /* /proc/sys/dev itself, in case that is not there yet */ |
254 | static ctl_table mac_hid_root_dir[] = { |
255 | { |
256 | .procname = "dev", |
257 | .maxlen = 0, |
258 | .mode = 0555, |
259 | .child = mac_hid_dir, |
260 | }, |
261 | { } |
262 | }; |
263 | |
264 | static struct ctl_table_header *mac_hid_sysctl_header; |
265 | |
266 | static int __init mac_hid_init(void) |
267 | { |
268 | mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); |
269 | if (!mac_hid_sysctl_header) |
270 | return -ENOMEM; |
271 | |
272 | return 0; |
273 | } |
274 | module_init(mac_hid_init); |
275 | |
276 | static void __exit mac_hid_exit(void) |
277 | { |
278 | unregister_sysctl_table(mac_hid_sysctl_header); |
279 | |
280 | if (mouse_emulate_buttons) |
281 | mac_hid_stop_emulation(); |
282 | } |
283 | module_exit(mac_hid_exit); |
284 |
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