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mac_hid.c

/*
 * drivers/macintosh/mac_hid.c
 *
 * HID support stuff for Macintosh computers.
 *
 * Copyright (C) 2000 Franz Sirl.
 *
 * This file will soon be removed in favor of an uinput userspace tool.
 */

#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/kbd_kern.h>


static struct input_dev *emumousebtn;
static int emumousebtn_input_register(void);
static int mouse_emulate_buttons;
static int mouse_button2_keycode = KEY_RIGHTCTRL;     /* right control key */
static int mouse_button3_keycode = KEY_RIGHTALT;      /* right option key */
static int mouse_last_keycode;

#if defined(CONFIG_SYSCTL)
/* file(s) in /proc/sys/dev/mac_hid */
static ctl_table mac_hid_files[] = {
      {
            .ctl_name   = DEV_MAC_HID_MOUSE_BUTTON_EMULATION,
            .procname   = "mouse_button_emulation",
            .data       = &mouse_emulate_buttons,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_dointvec,
      },
      {
            .ctl_name   = DEV_MAC_HID_MOUSE_BUTTON2_KEYCODE,
            .procname   = "mouse_button2_keycode",
            .data       = &mouse_button2_keycode,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_dointvec,
      },
      {
            .ctl_name   = DEV_MAC_HID_MOUSE_BUTTON3_KEYCODE,
            .procname   = "mouse_button3_keycode",
            .data       = &mouse_button3_keycode,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_dointvec,
      },
      { .ctl_name = 0 }
};

/* dir in /proc/sys/dev */
static ctl_table mac_hid_dir[] = {
      {
            .ctl_name   = DEV_MAC_HID,
            .procname   = "mac_hid",
            .maxlen           = 0,
            .mode       = 0555,
            .child            = mac_hid_files,
      },
      { .ctl_name = 0 }
};

/* /proc/sys/dev itself, in case that is not there yet */
static ctl_table mac_hid_root_dir[] = {
      {
            .ctl_name   = CTL_DEV,
            .procname   = "dev",
            .maxlen           = 0,
            .mode       = 0555,
            .child            = mac_hid_dir,
      },
      { .ctl_name = 0 }
};

static struct ctl_table_header *mac_hid_sysctl_header;

#endif /* endif CONFIG_SYSCTL */

int mac_hid_mouse_emulate_buttons(int caller, unsigned int keycode, int down)
{
      switch (caller) {
      case 1:
            /* Called from keyboard.c */
            if (mouse_emulate_buttons
                && (keycode == mouse_button2_keycode
                  || keycode == mouse_button3_keycode)) {
                  if (mouse_emulate_buttons == 1) {
                        input_report_key(emumousebtn,
                                     keycode == mouse_button2_keycode ? BTN_MIDDLE : BTN_RIGHT,
                                     down);
                        input_sync(emumousebtn);
                        return 1;
                  }
                  mouse_last_keycode = down ? keycode : 0;
            }
            break;
      }
      return 0;
}

static int emumousebtn_input_register(void)
{
      int ret;

      emumousebtn = input_allocate_device();
      if (!emumousebtn)
            return -ENOMEM;

      emumousebtn->name = "Macintosh mouse button emulation";
      emumousebtn->id.bustype = BUS_ADB;
      emumousebtn->id.vendor = 0x0001;
      emumousebtn->id.product = 0x0001;
      emumousebtn->id.version = 0x0100;

      emumousebtn->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
      emumousebtn->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
            BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
      emumousebtn->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

      ret = input_register_device(emumousebtn);
      if (ret)
            input_free_device(emumousebtn);

      return ret;
}

static int __init mac_hid_init(void)
{
      int err;

      err = emumousebtn_input_register();
      if (err)
            return err;

#if defined(CONFIG_SYSCTL)
      mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
#endif /* CONFIG_SYSCTL */

      return 0;
}

device_initcall(mac_hid_init);

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