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
  17 MODULE_LICENSE("GPL");
  18
  19 static int mouse_emulate_buttons;
  20 static int mouse_button2_keycode = KEY_RIGHTCTRL;       /* right control key */
  21 static int mouse_button3_keycode = KEY_RIGHTALT;        /* right option key */
  22
  23 static struct input_dev *mac_hid_emumouse_dev;
  24
  25 static int mac_hid_create_emumouse(void)
  26 {
  27         static struct lock_class_key mac_hid_emumouse_dev_event_class;
  28         static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
  29         int err;
  30
  31         mac_hid_emumouse_dev = input_allocate_device();
  32         if (!mac_hid_emumouse_dev)
  33                 return -ENOMEM;
  34
  35         lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
  36                           &mac_hid_emumouse_dev_event_class);
  37         lockdep_set_class(&mac_hid_emumouse_dev->mutex,
  38                           &mac_hid_emumouse_dev_mutex_class);
  39
  40         mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
  41         mac_hid_emumouse_dev->id.bustype = BUS_ADB;
  42         mac_hid_emumouse_dev->id.vendor = 0x0001;
  43         mac_hid_emumouse_dev->id.product = 0x0001;
  44         mac_hid_emumouse_dev->id.version = 0x0100;
  45
  46         mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
  47         mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
  48                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
  49         mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
  50
  51         err = input_register_device(mac_hid_emumouse_dev);
  52         if (err) {
  53                 input_free_device(mac_hid_emumouse_dev);
  54                 mac_hid_emumouse_dev = NULL;
  55                 return err;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static void mac_hid_destroy_emumouse(void)
  62 {
  63         input_unregister_device(mac_hid_emumouse_dev);
  64         mac_hid_emumouse_dev = NULL;
  65 }
  66
  67 static bool mac_hid_emumouse_filter(struct input_handle *handle,
  68                                     unsigned int type, unsigned int code,
  69                                     int value)
  70 {
  71         unsigned int btn;
  72
  73         if (type != EV_KEY)
  74                 return false;
  75
  76         if (code == mouse_button2_keycode)
  77                 btn = BTN_MIDDLE;
  78         else if (code == mouse_button3_keycode)
  79                 btn = BTN_RIGHT;
  80         else
  81                 return false;
  82
  83         input_report_key(mac_hid_emumouse_dev, btn, value);
  84         input_sync(mac_hid_emumouse_dev);
  85
  86         return true;
  87 }
  88
  89 static int mac_hid_emumouse_connect(struct input_handler *handler,
  90                                     struct input_dev *dev,
  91                                     const struct input_device_id *id)
  92 {
  93         struct input_handle *handle;
  94         int error;
  95
  96         /* Don't bind to ourselves */
  97         if (dev == mac_hid_emumouse_dev)
  98                 return -ENODEV;
  99
 100         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 101         if (!handle)
 102                 return -ENOMEM;
 103
 104         handle->dev = dev;
 105         handle->handler = handler;
 106         handle->name = "mac-button-emul";
 107
 108         error = input_register_handle(handle);
 109         if (error) {
 110                 printk(KERN_ERR
 111                         "mac_hid: Failed to register button emulation handle, "
 112                         "error %d\n", error);
 113                 goto err_free;
 114         }
 115
 116         error = input_open_device(handle);
 117         if (error) {
 118                 printk(KERN_ERR
 119                         "mac_hid: Failed to open input device, error %d\n",
 120                         error);
 121                 goto err_unregister;
 122         }
 123
 124         return 0;
 125
 126  err_unregister:
 127         input_unregister_handle(handle);
 128  err_free:
 129         kfree(handle);
 130         return error;
 131 }
 132
 133 static void mac_hid_emumouse_disconnect(struct input_handle *handle)
 134 {
 135         input_close_device(handle);
 136         input_unregister_handle(handle);
 137         kfree(handle);
 138 }
 139
 140 static const struct input_device_id mac_hid_emumouse_ids[] = {
 141         {
 142                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
 143                 .evbit = { BIT_MASK(EV_KEY) },
 144         },
 145         { },
 146 };
 147
 148 MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
 149
 150 static struct input_handler mac_hid_emumouse_handler = {
 151         .filter         = mac_hid_emumouse_filter,
 152         .connect        = mac_hid_emumouse_connect,
 153         .disconnect     = mac_hid_emumouse_disconnect,
 154         .name           = "mac-button-emul",
 155         .id_table       = mac_hid_emumouse_ids,
 156 };
 157
 158 static int mac_hid_start_emulation(void)
 159 {
 160         int err;
 161
 162         err = mac_hid_create_emumouse();
 163         if (err)
 164                 return err;
 165
 166         err = input_register_handler(&mac_hid_emumouse_handler);
 167         if (err) {
 168                 mac_hid_destroy_emumouse();
 169                 return err;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static void mac_hid_stop_emulation(void)
 176 {
 177         input_unregister_handler(&mac_hid_emumouse_handler);
 178         mac_hid_destroy_emumouse();
 179 }
 180
 181 static int mac_hid_toggle_emumouse(ctl_table *table, int write,
 182                                    void __user *buffer, size_t *lenp,
 183                                    loff_t *ppos)
 184 {
 185         int *valp = table->data;
 186         int old_val = *valp;
 187         int rc;
 188
 189         rc = proc_dointvec(table, write, buffer, lenp, ppos);
 190
 191         if (rc == 0 && write && *valp != old_val) {
 192                 if (*valp == 1)
 193                         rc = mac_hid_start_emulation();
 194                 else if (*valp == 0)
 195                         mac_hid_stop_emulation();
 196                 else
 197                         rc = -EINVAL;
 198         }
 199
 200         /* Restore the old value in case of error */
 201         if (rc)
 202                 *valp = old_val;
 203
 204         return rc;
 205 }
 206
 207 /* file(s) in /proc/sys/dev/mac_hid */
 208 static ctl_table mac_hid_files[] = {
 209         {
 210                 .procname       = "mouse_button_emulation",
 211                 .data           = &mouse_emulate_buttons,
 212                 .maxlen         = sizeof(int),
 213                 .mode           = 0644,
 214                 .proc_handler   = mac_hid_toggle_emumouse,
 215         },
 216         {
 217                 .procname       = "mouse_button2_keycode",
 218                 .data           = &mouse_button2_keycode,
 219                 .maxlen         = sizeof(int),
 220                 .mode           = 0644,
 221                 .proc_handler   = proc_dointvec,
 222         },
 223         {
 224                 .procname       = "mouse_button3_keycode",
 225                 .data           = &mouse_button3_keycode,
 226                 .maxlen         = sizeof(int),
 227                 .mode           = 0644,
 228                 .proc_handler   = proc_dointvec,
 229         },
 230         { }
 231 };
 232
 233 /* dir in /proc/sys/dev */
 234 static ctl_table mac_hid_dir[] = {
 235         {
 236                 .procname       = "mac_hid",
 237                 .maxlen         = 0,
 238                 .mode           = 0555,
 239                 .child          = mac_hid_files,
 240         },
 241         { }
 242 };
 243
 244 /* /proc/sys/dev itself, in case that is not there yet */
 245 static ctl_table mac_hid_root_dir[] = {
 246         {
 247                 .procname       = "dev",
 248                 .maxlen         = 0,
 249                 .mode           = 0555,
 250                 .child          = mac_hid_dir,
 251         },
 252         { }
 253 };
 254
 255 static struct ctl_table_header *mac_hid_sysctl_header;
 256
 257 static int __init mac_hid_init(void)
 258 {
 259         mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
 260         if (!mac_hid_sysctl_header)
 261                 return -ENOMEM;
 262
 263         return 0;
 264 }
 265 module_init(mac_hid_init);
 266
 267 static void __exit mac_hid_exit(void)
 268 {
 269         unregister_sysctl_table(mac_hid_sysctl_header);
 270
 271         if (mouse_emulate_buttons)
 272                 mac_hid_stop_emulation();
 273 }
 274 module_exit(mac_hid_exit);