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Linux/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(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 */
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 
242 /* dir in /proc/sys/dev */
243 static 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 */
254 static 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 
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);
284 

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