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maple_keyb.c

/*
 * SEGA Dreamcast keyboard driver
 * Based on drivers/usb/usbkbd.c
 * Copyright YAEGASHI Takeshi, 2001
 * Porting to 2.6 Copyright Adrian McMenamin, 2007
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/maple.h>
#include <asm/mach/maple.h>

/* Very simple mutex to ensure proper cleanup */
static DEFINE_MUTEX(maple_keyb_mutex);

#define NR_SCANCODES 256

MODULE_AUTHOR("YAEGASHI Takeshi, Adrian McMenamin");
MODULE_DESCRIPTION("SEGA Dreamcast keyboard driver");
MODULE_LICENSE("GPL");

struct dc_kbd {
      struct input_dev *dev;
      unsigned short keycode[NR_SCANCODES];
      unsigned char new[8];
      unsigned char old[8];
};

static const unsigned short dc_kbd_keycode[NR_SCANCODES] = {
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_A, KEY_B, KEY_C, KEY_D,
      KEY_E, KEY_F, KEY_G, KEY_H, KEY_I, KEY_J, KEY_K, KEY_L,
      KEY_M, KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R, KEY_S, KEY_T,
      KEY_U, KEY_V, KEY_W, KEY_X, KEY_Y, KEY_Z, KEY_1, KEY_2,
      KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9, KEY_0,
      KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, KEY_SPACE, KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE,
      KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_BACKSLASH, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA,
      KEY_DOT, KEY_SLASH, KEY_CAPSLOCK, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6,
      KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, KEY_SYSRQ,
      KEY_SCROLLLOCK, KEY_PAUSE, KEY_INSERT, KEY_HOME, KEY_PAGEUP, KEY_DELETE,
      KEY_END, KEY_PAGEDOWN, KEY_RIGHT, KEY_LEFT, KEY_DOWN, KEY_UP,
      KEY_NUMLOCK, KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS, KEY_KPPLUS, KEY_KPENTER, KEY_KP1, KEY_KP2,
      KEY_KP3, KEY_KP4, KEY_KP5, KEY_KP6, KEY_KP7, KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT,
      KEY_102ND, KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, KEY_F13, KEY_F14, KEY_F15,
      KEY_F16, KEY_F17, KEY_F18, KEY_F19, KEY_F20,
      KEY_F21, KEY_F22, KEY_F23, KEY_F24, KEY_OPEN, KEY_HELP, KEY_PROPS, KEY_FRONT,
      KEY_STOP, KEY_AGAIN, KEY_UNDO, KEY_CUT, KEY_COPY, KEY_PASTE, KEY_FIND, KEY_MUTE,
      KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_KPCOMMA, KEY_RESERVED, KEY_RO, KEY_KATAKANAHIRAGANA , KEY_YEN,
      KEY_HENKAN, KEY_MUHENKAN, KEY_KPJPCOMMA, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_HANGEUL, KEY_HANJA, KEY_KATAKANA, KEY_HIRAGANA, KEY_ZENKAKUHANKAKU, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
      KEY_LEFTCTRL, KEY_LEFTSHIFT, KEY_LEFTALT, KEY_LEFTMETA, KEY_RIGHTCTRL, KEY_RIGHTSHIFT, KEY_RIGHTALT, KEY_RIGHTMETA,
      KEY_PLAYPAUSE, KEY_STOPCD, KEY_PREVIOUSSONG, KEY_NEXTSONG, KEY_EJECTCD, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE,
      KEY_WWW, KEY_BACK, KEY_FORWARD, KEY_STOP, KEY_FIND, KEY_SCROLLUP, KEY_SCROLLDOWN, KEY_EDIT, KEY_SLEEP,
      KEY_SCREENLOCK, KEY_REFRESH, KEY_CALC, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED
};

static void dc_scan_kbd(struct dc_kbd *kbd)
{
      struct input_dev *dev = kbd->dev;
      void *ptr;
      int code, keycode;
      int i;

      for (i = 0; i < 8; i++) {
            code = i + 224;
            keycode = kbd->keycode[code];
            input_event(dev, EV_MSC, MSC_SCAN, code);
            input_report_key(dev, keycode, (kbd->new[0] >> i) & 1);
      }

      for (i = 2; i < 8; i++) {
            ptr = memchr(kbd->new + 2, kbd->old[i], 6);
            code = kbd->old[i];
            if (code > 3 && ptr == NULL) {
                  keycode = kbd->keycode[code];
                  if (keycode) {
                        input_event(dev, EV_MSC, MSC_SCAN, code);
                        input_report_key(dev, keycode, 0);
                  } else
                        printk(KERN_DEBUG "maple_keyb: "
                              "Unknown key (scancode %#x) released.",
                              code);
            }
            ptr = memchr(kbd->old + 2, kbd->new[i], 6);
            code = kbd->new[i];
            if (code > 3 && ptr) {
                  keycode = kbd->keycode[code];
                  if (keycode) {
                        input_event(dev, EV_MSC, MSC_SCAN, code);
                        input_report_key(dev, keycode, 1);
                  } else
                        printk(KERN_DEBUG "maple_keyb: "
                              "Unknown key (scancode %#x) pressed.",
                              code);
            }
      }
      input_sync(dev);
      memcpy(kbd->old, kbd->new, 8);
}

static void dc_kbd_callback(struct mapleq *mq)
{
      struct maple_device *mapledev = mq->dev;
      struct dc_kbd *kbd = mapledev->private_data;
      unsigned long *buf = mq->recvbuf;

      /*
       * We should always be getting the lock because the only
       * time it may be locked if driver is in cleanup phase.
       */
      if (likely(mutex_trylock(&maple_keyb_mutex))) {

            if (buf[1] == mapledev->function) {
                  memcpy(kbd->new, buf + 2, 8);
                  dc_scan_kbd(kbd);
            }

            mutex_unlock(&maple_keyb_mutex);
      }
}

static int dc_kbd_connect(struct maple_device *mdev)
{
      int i, error;
      struct dc_kbd *kbd;
      struct input_dev *dev;

      if (!(mdev->function & MAPLE_FUNC_KEYBOARD))
            return -EINVAL;

      kbd = kzalloc(sizeof(struct dc_kbd), GFP_KERNEL);
      dev = input_allocate_device();
      if (!kbd || !dev) {
            error = -ENOMEM;
            goto fail;
      }

      mdev->private_data = kbd;

      kbd->dev = dev;
      memcpy(kbd->keycode, dc_kbd_keycode, sizeof(kbd->keycode));

      dev->name = mdev->product_name;
      dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
      dev->keycode = kbd->keycode;
      dev->keycodesize = sizeof (unsigned short);
      dev->keycodemax = ARRAY_SIZE(kbd->keycode);
      dev->id.bustype = BUS_HOST;
      dev->dev.parent = &mdev->dev;

      for (i = 0; i < NR_SCANCODES; i++)
            __set_bit(dc_kbd_keycode[i], dev->keybit);
      __clear_bit(KEY_RESERVED, dev->keybit);

      input_set_capability(dev, EV_MSC, MSC_SCAN);
      input_set_drvdata(dev, kbd);

      error = input_register_device(dev);
      if (error)
            goto fail;

      /* Maple polling is locked to VBLANK - which may be just 50/s */
      maple_getcond_callback(mdev, dc_kbd_callback, HZ/50, MAPLE_FUNC_KEYBOARD);
      return 0;

 fail:
      input_free_device(dev);
      kfree(kbd);
      mdev->private_data = NULL;
      return error;
}

static void dc_kbd_disconnect(struct maple_device *mdev)
{
      struct dc_kbd *kbd;

      mutex_lock(&maple_keyb_mutex);

      kbd = mdev->private_data;
      mdev->private_data = NULL;
      input_unregister_device(kbd->dev);
      kfree(kbd);

      mutex_unlock(&maple_keyb_mutex);
}

/* allow the keyboard to be used */
static int probe_maple_kbd(struct device *dev)
{
      struct maple_device *mdev = to_maple_dev(dev);
      struct maple_driver *mdrv = to_maple_driver(dev->driver);
      int error;

      error = dc_kbd_connect(mdev);
      if (error)
            return error;

      mdev->driver = mdrv;
      mdev->registered = 1;

      return 0;
}

static struct maple_driver dc_kbd_driver = {
      .function = MAPLE_FUNC_KEYBOARD,
      .connect = dc_kbd_connect,
      .disconnect = dc_kbd_disconnect,
      .drv = {
            .name = "Dreamcast_keyboard",
            .probe = probe_maple_kbd,
       },
};

static int __init dc_kbd_init(void)
{
      return maple_driver_register(&dc_kbd_driver.drv);
}

static void __exit dc_kbd_exit(void)
{
      driver_unregister(&dc_kbd_driver.drv);
}

module_init(dc_kbd_init);
module_exit(dc_kbd_exit);

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