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
18MODULE_LICENSE("GPL");
19
20static int mouse_emulate_buttons;
21static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */
22static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */
23
24static struct input_dev *mac_hid_emumouse_dev;
25
26static DEFINE_MUTEX(mac_hid_emumouse_mutex);
27
28static 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
64static void mac_hid_destroy_emumouse(void)
65{
66 input_unregister_device(mac_hid_emumouse_dev);
67 mac_hid_emumouse_dev = NULL;
68}
69
70static 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
92static 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
136static 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
143static 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
151MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
152
153static 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
161static 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
178static void mac_hid_stop_emulation(void)
179{
180 input_unregister_handler(&mac_hid_emumouse_handler);
181 mac_hid_destroy_emumouse();
182}
183
184static int mac_hid_toggle_emumouse(struct 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 */
217static 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
242/* dir in /proc/sys/dev */
243static struct 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 */
254static struct 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
264static struct ctl_table_header *mac_hid_sysctl_header;
265
266static 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}
274module_init(mac_hid_init);
275
276static 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}
283module_exit(mac_hid_exit);
284