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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/kbd_kern.h>
  17
  18
  19 static struct input_dev *emumousebtn;
  20 static int emumousebtn_input_register(void);
  21 static int mouse_emulate_buttons;
  22 static int mouse_button2_keycode = KEY_RIGHTCTRL;       /* right control key */
  23 static int mouse_button3_keycode = KEY_RIGHTALT;        /* right option key */
  24 static int mouse_last_keycode;
  25
  26 #if defined(CONFIG_SYSCTL)
  27 /* file(s) in /proc/sys/dev/mac_hid */
  28 static ctl_table mac_hid_files[] = {
  29         {
  30                 .procname       = "mouse_button_emulation",
  31                 .data           = &mouse_emulate_buttons,
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec,
  35         },
  36         {
  37                 .procname       = "mouse_button2_keycode",
  38                 .data           = &mouse_button2_keycode,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec,
  42         },
  43         {
  44                 .procname       = "mouse_button3_keycode",
  45                 .data           = &mouse_button3_keycode,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec,
  49         },
  50         { }
  51 };
  52
  53 /* dir in /proc/sys/dev */
  54 static ctl_table mac_hid_dir[] = {
  55         {
  56                 .procname       = "mac_hid",
  57                 .maxlen         = 0,
  58                 .mode           = 0555,
  59                 .child          = mac_hid_files,
  60         },
  61         { }
  62 };
  63
  64 /* /proc/sys/dev itself, in case that is not there yet */
  65 static ctl_table mac_hid_root_dir[] = {
  66         {
  67                 .procname       = "dev",
  68                 .maxlen         = 0,
  69                 .mode           = 0555,
  70                 .child          = mac_hid_dir,
  71         },
  72         { }
  73 };
  74
  75 static struct ctl_table_header *mac_hid_sysctl_header;
  76
  77 #endif /* endif CONFIG_SYSCTL */
  78
  79 int mac_hid_mouse_emulate_buttons(int caller, unsigned int keycode, int down)
  80 {
  81         switch (caller) {
  82         case 1:
  83                 /* Called from keyboard.c */
  84                 if (mouse_emulate_buttons
  85                     && (keycode == mouse_button2_keycode
  86                         || keycode == mouse_button3_keycode)) {
  87                         if (mouse_emulate_buttons == 1) {
  88                                 input_report_key(emumousebtn,
  89                                                  keycode == mouse_button2_keycode ? BTN_MIDDLE : BTN_RIGHT,
  90                                                  down);
  91                                 input_sync(emumousebtn);
  92                                 return 1;
  93                         }
  94                         mouse_last_keycode = down ? keycode : 0;
  95                 }
  96                 break;
  97         }
  98         return 0;
  99 }
 100
 101 static struct lock_class_key emumousebtn_event_class;
 102 static struct lock_class_key emumousebtn_mutex_class;
 103
 104 static int emumousebtn_input_register(void)
 105 {
 106         int ret;
 107
 108         emumousebtn = input_allocate_device();
 109         if (!emumousebtn)
 110                 return -ENOMEM;
 111
 112         lockdep_set_class(&emumousebtn->event_lock, &emumousebtn_event_class);
 113         lockdep_set_class(&emumousebtn->mutex, &emumousebtn_mutex_class);
 114
 115         emumousebtn->name = "Macintosh mouse button emulation";
 116         emumousebtn->id.bustype = BUS_ADB;
 117         emumousebtn->id.vendor = 0x0001;
 118         emumousebtn->id.product = 0x0001;
 119         emumousebtn->id.version = 0x0100;
 120
 121         emumousebtn->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 122         emumousebtn->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
 123                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 124         emumousebtn->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 125
 126         ret = input_register_device(emumousebtn);
 127         if (ret)
 128                 input_free_device(emumousebtn);
 129
 130         return ret;
 131 }
 132
 133 static int __init mac_hid_init(void)
 134 {
 135         int err;
 136
 137         err = emumousebtn_input_register();
 138         if (err)
 139                 return err;
 140
 141 #if defined(CONFIG_SYSCTL)
 142         mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
 143 #endif /* CONFIG_SYSCTL */
 144
 145         return 0;
 146 }
 147
 148 device_initcall(mac_hid_init);