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