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