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);