Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[linux-2.6.git] / 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
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);