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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * drivers/macintosh/mac_hid.c | |
4 | * | |
5 | * HID support stuff for Macintosh computers. | |
6 | * | |
7 | * Copyright (C) 2000 Franz Sirl. | |
8 | * | |
9 | * This file will soon be removed in favor of an uinput userspace tool. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/sysctl.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/module.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 | 18 | |
429722e1 DT |
19 | MODULE_LICENSE("GPL"); |
20 | ||
87275856 | 21 | static int mouse_emulate_buttons; |
1da177e4 LT |
22 | static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ |
23 | static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ | |
1da177e4 | 24 | |
99b089c3 DT |
25 | static struct input_dev *mac_hid_emumouse_dev; |
26 | ||
87abb6bb DT |
27 | static DEFINE_MUTEX(mac_hid_emumouse_mutex); |
28 | ||
99b089c3 DT |
29 | static int mac_hid_create_emumouse(void) |
30 | { | |
31 | static struct lock_class_key mac_hid_emumouse_dev_event_class; | |
32 | static struct lock_class_key mac_hid_emumouse_dev_mutex_class; | |
33 | int err; | |
34 | ||
35 | mac_hid_emumouse_dev = input_allocate_device(); | |
36 | if (!mac_hid_emumouse_dev) | |
37 | return -ENOMEM; | |
38 | ||
39 | lockdep_set_class(&mac_hid_emumouse_dev->event_lock, | |
40 | &mac_hid_emumouse_dev_event_class); | |
41 | lockdep_set_class(&mac_hid_emumouse_dev->mutex, | |
42 | &mac_hid_emumouse_dev_mutex_class); | |
43 | ||
44 | mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; | |
45 | mac_hid_emumouse_dev->id.bustype = BUS_ADB; | |
46 | mac_hid_emumouse_dev->id.vendor = 0x0001; | |
47 | mac_hid_emumouse_dev->id.product = 0x0001; | |
48 | mac_hid_emumouse_dev->id.version = 0x0100; | |
49 | ||
50 | mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); | |
51 | mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = | |
52 | BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); | |
53 | mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); | |
54 | ||
55 | err = input_register_device(mac_hid_emumouse_dev); | |
56 | if (err) { | |
57 | input_free_device(mac_hid_emumouse_dev); | |
58 | mac_hid_emumouse_dev = NULL; | |
59 | return err; | |
60 | } | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static void mac_hid_destroy_emumouse(void) | |
66 | { | |
67 | input_unregister_device(mac_hid_emumouse_dev); | |
68 | mac_hid_emumouse_dev = NULL; | |
69 | } | |
70 | ||
71 | static bool mac_hid_emumouse_filter(struct input_handle *handle, | |
72 | unsigned int type, unsigned int code, | |
73 | int value) | |
74 | { | |
75 | unsigned int btn; | |
76 | ||
77 | if (type != EV_KEY) | |
78 | return false; | |
79 | ||
80 | if (code == mouse_button2_keycode) | |
81 | btn = BTN_MIDDLE; | |
82 | else if (code == mouse_button3_keycode) | |
83 | btn = BTN_RIGHT; | |
84 | else | |
85 | return false; | |
86 | ||
87 | input_report_key(mac_hid_emumouse_dev, btn, value); | |
88 | input_sync(mac_hid_emumouse_dev); | |
89 | ||
90 | return true; | |
91 | } | |
92 | ||
93 | static int mac_hid_emumouse_connect(struct input_handler *handler, | |
94 | struct input_dev *dev, | |
95 | const struct input_device_id *id) | |
96 | { | |
97 | struct input_handle *handle; | |
98 | int error; | |
99 | ||
100 | /* Don't bind to ourselves */ | |
101 | if (dev == mac_hid_emumouse_dev) | |
102 | return -ENODEV; | |
103 | ||
104 | handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); | |
105 | if (!handle) | |
106 | return -ENOMEM; | |
107 | ||
108 | handle->dev = dev; | |
109 | handle->handler = handler; | |
110 | handle->name = "mac-button-emul"; | |
111 | ||
112 | error = input_register_handle(handle); | |
113 | if (error) { | |
114 | printk(KERN_ERR | |
115 | "mac_hid: Failed to register button emulation handle, " | |
116 | "error %d\n", error); | |
117 | goto err_free; | |
118 | } | |
119 | ||
120 | error = input_open_device(handle); | |
121 | if (error) { | |
122 | printk(KERN_ERR | |
123 | "mac_hid: Failed to open input device, error %d\n", | |
124 | error); | |
125 | goto err_unregister; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | ||
130 | err_unregister: | |
131 | input_unregister_handle(handle); | |
132 | err_free: | |
133 | kfree(handle); | |
134 | return error; | |
135 | } | |
136 | ||
137 | static void mac_hid_emumouse_disconnect(struct input_handle *handle) | |
138 | { | |
139 | input_close_device(handle); | |
140 | input_unregister_handle(handle); | |
141 | kfree(handle); | |
142 | } | |
143 | ||
144 | static const struct input_device_id mac_hid_emumouse_ids[] = { | |
145 | { | |
146 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT, | |
147 | .evbit = { BIT_MASK(EV_KEY) }, | |
148 | }, | |
149 | { }, | |
150 | }; | |
151 | ||
152 | MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); | |
153 | ||
154 | static struct input_handler mac_hid_emumouse_handler = { | |
155 | .filter = mac_hid_emumouse_filter, | |
156 | .connect = mac_hid_emumouse_connect, | |
157 | .disconnect = mac_hid_emumouse_disconnect, | |
158 | .name = "mac-button-emul", | |
159 | .id_table = mac_hid_emumouse_ids, | |
160 | }; | |
161 | ||
162 | static int mac_hid_start_emulation(void) | |
163 | { | |
164 | int err; | |
165 | ||
166 | err = mac_hid_create_emumouse(); | |
167 | if (err) | |
168 | return err; | |
169 | ||
170 | err = input_register_handler(&mac_hid_emumouse_handler); | |
171 | if (err) { | |
172 | mac_hid_destroy_emumouse(); | |
173 | return err; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static void mac_hid_stop_emulation(void) | |
180 | { | |
181 | input_unregister_handler(&mac_hid_emumouse_handler); | |
182 | mac_hid_destroy_emumouse(); | |
183 | } | |
184 | ||
5eb969d0 | 185 | static int mac_hid_toggle_emumouse(struct ctl_table *table, int write, |
32927393 | 186 | void *buffer, size_t *lenp, loff_t *ppos) |
99b089c3 DT |
187 | { |
188 | int *valp = table->data; | |
189 | int old_val = *valp; | |
190 | int rc; | |
191 | ||
87abb6bb DT |
192 | rc = mutex_lock_killable(&mac_hid_emumouse_mutex); |
193 | if (rc) | |
194 | return rc; | |
195 | ||
99b089c3 DT |
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 | ||
87abb6bb DT |
211 | mutex_unlock(&mac_hid_emumouse_mutex); |
212 | ||
99b089c3 DT |
213 | return rc; |
214 | } | |
215 | ||
1da177e4 | 216 | /* file(s) in /proc/sys/dev/mac_hid */ |
5eb969d0 | 217 | static struct ctl_table mac_hid_files[] = { |
1da177e4 | 218 | { |
1da177e4 LT |
219 | .procname = "mouse_button_emulation", |
220 | .data = &mouse_emulate_buttons, | |
221 | .maxlen = sizeof(int), | |
222 | .mode = 0644, | |
99b089c3 | 223 | .proc_handler = mac_hid_toggle_emumouse, |
1da177e4 LT |
224 | }, |
225 | { | |
1da177e4 LT |
226 | .procname = "mouse_button2_keycode", |
227 | .data = &mouse_button2_keycode, | |
228 | .maxlen = sizeof(int), | |
229 | .mode = 0644, | |
6d456111 | 230 | .proc_handler = proc_dointvec, |
1da177e4 LT |
231 | }, |
232 | { | |
1da177e4 LT |
233 | .procname = "mouse_button3_keycode", |
234 | .data = &mouse_button3_keycode, | |
235 | .maxlen = sizeof(int), | |
236 | .mode = 0644, | |
6d456111 | 237 | .proc_handler = proc_dointvec, |
1da177e4 | 238 | }, |
894d2491 | 239 | { } |
1da177e4 LT |
240 | }; |
241 | ||
242 | /* dir in /proc/sys/dev */ | |
5eb969d0 | 243 | static struct ctl_table mac_hid_dir[] = { |
1da177e4 | 244 | { |
1da177e4 LT |
245 | .procname = "mac_hid", |
246 | .maxlen = 0, | |
247 | .mode = 0555, | |
248 | .child = mac_hid_files, | |
249 | }, | |
894d2491 | 250 | { } |
1da177e4 LT |
251 | }; |
252 | ||
253 | /* /proc/sys/dev itself, in case that is not there yet */ | |
5eb969d0 | 254 | static struct ctl_table mac_hid_root_dir[] = { |
1da177e4 | 255 | { |
1da177e4 LT |
256 | .procname = "dev", |
257 | .maxlen = 0, | |
258 | .mode = 0555, | |
259 | .child = mac_hid_dir, | |
260 | }, | |
894d2491 | 261 | { } |
1da177e4 LT |
262 | }; |
263 | ||
264 | static struct ctl_table_header *mac_hid_sysctl_header; | |
265 | ||
f3e5d2bf | 266 | static int __init mac_hid_init(void) |
1da177e4 | 267 | { |
0b4d4147 | 268 | mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); |
99b089c3 DT |
269 | if (!mac_hid_sysctl_header) |
270 | return -ENOMEM; | |
1da177e4 LT |
271 | |
272 | return 0; | |
273 | } | |
429722e1 | 274 | module_init(mac_hid_init); |
1da177e4 | 275 | |
429722e1 DT |
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); |