Root/drivers/macintosh/mac_hid.c

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(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 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 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 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

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