1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | |
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> |
17 | #include <linux/slab.h> |
18 | |
19 | MODULE_LICENSE("GPL" ); |
20 | |
21 | static int mouse_emulate_buttons; |
22 | static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ |
23 | static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ |
24 | |
25 | static struct input_dev *mac_hid_emumouse_dev; |
26 | |
27 | static DEFINE_MUTEX(mac_hid_emumouse_mutex); |
28 | |
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(dev: 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(dev: mac_hid_emumouse_dev, code: btn, value); |
88 | input_sync(dev: 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(size: 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(objp: 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(objp: 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 | |
185 | static int mac_hid_toggle_emumouse(struct ctl_table *table, int write, |
186 | void *buffer, size_t *lenp, 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(lock: &mac_hid_emumouse_mutex); |
212 | |
213 | return rc; |
214 | } |
215 | |
216 | /* file(s) in /proc/sys/dev/mac_hid */ |
217 | static struct 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 | static struct ctl_table_header *; |
242 | |
243 | static int __init mac_hid_init(void) |
244 | { |
245 | mac_hid_sysctl_header = register_sysctl("dev/mac_hid" , mac_hid_files); |
246 | if (!mac_hid_sysctl_header) |
247 | return -ENOMEM; |
248 | |
249 | return 0; |
250 | } |
251 | module_init(mac_hid_init); |
252 | |
253 | static void __exit mac_hid_exit(void) |
254 | { |
255 | unregister_sysctl_table(table: mac_hid_sysctl_header); |
256 | |
257 | if (mouse_emulate_buttons) |
258 | mac_hid_stop_emulation(); |
259 | } |
260 | module_exit(mac_hid_exit); |
261 | |