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amikbd.c

/*
 * $Id: amikbd.c,v 1.13 2002/02/01 16:02:24 vojtech Exp $
 *
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    Hamish Macdonald
 */

/*
 * Amiga keyboard driver for Linux/m68k
 */

/*
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/keyboard.h>

#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Amiga keyboard driver");
MODULE_LICENSE("GPL");

static unsigned char amikbd_keycode[0x78] __initdata = {
      [0]    = KEY_GRAVE,
      [1]    = KEY_1,
      [2]    = KEY_2,
      [3]    = KEY_3,
      [4]    = KEY_4,
      [5]    = KEY_5,
      [6]    = KEY_6,
      [7]    = KEY_7,
      [8]    = KEY_8,
      [9]    = KEY_9,
      [10]   = KEY_0,
      [11]   = KEY_MINUS,
      [12]   = KEY_EQUAL,
      [13]   = KEY_BACKSLASH,
      [15]   = KEY_KP0,
      [16]   = KEY_Q,
      [17]   = KEY_W,
      [18]   = KEY_E,
      [19]   = KEY_R,
      [20]   = KEY_T,
      [21]   = KEY_Y,
      [22]   = KEY_U,
      [23]   = KEY_I,
      [24]   = KEY_O,
      [25]   = KEY_P,
      [26]   = KEY_LEFTBRACE,
      [27]   = KEY_RIGHTBRACE,
      [29]   = KEY_KP1,
      [30]   = KEY_KP2,
      [31]   = KEY_KP3,
      [32]   = KEY_A,
      [33]   = KEY_S,
      [34]   = KEY_D,
      [35]   = KEY_F,
      [36]   = KEY_G,
      [37]   = KEY_H,
      [38]   = KEY_J,
      [39]   = KEY_K,
      [40]   = KEY_L,
      [41]   = KEY_SEMICOLON,
      [42]   = KEY_APOSTROPHE,
      [43]   = KEY_BACKSLASH,
      [45]   = KEY_KP4,
      [46]   = KEY_KP5,
      [47]   = KEY_KP6,
      [48]   = KEY_102ND,
      [49]   = KEY_Z,
      [50]   = KEY_X,
      [51]   = KEY_C,
      [52]   = KEY_V,
      [53]   = KEY_B,
      [54]   = KEY_N,
      [55]   = KEY_M,
      [56]   = KEY_COMMA,
      [57]   = KEY_DOT,
      [58]   = KEY_SLASH,
      [60]   = KEY_KPDOT,
      [61]   = KEY_KP7,
      [62]   = KEY_KP8,
      [63]   = KEY_KP9,
      [64]   = KEY_SPACE,
      [65]   = KEY_BACKSPACE,
      [66]   = KEY_TAB,
      [67]   = KEY_KPENTER,
      [68]   = KEY_ENTER,
      [69]   = KEY_ESC,
      [70]   = KEY_DELETE,
      [74]   = KEY_KPMINUS,
      [76]   = KEY_UP,
      [77]   = KEY_DOWN,
      [78]   = KEY_RIGHT,
      [79]   = KEY_LEFT,
      [80]   = KEY_F1,
      [81]   = KEY_F2,
      [82]   = KEY_F3,
      [83]   = KEY_F4,
      [84]   = KEY_F5,
      [85]   = KEY_F6,
      [86]   = KEY_F7,
      [87]   = KEY_F8,
      [88]   = KEY_F9,
      [89]   = KEY_F10,
      [90]   = KEY_KPLEFTPAREN,
      [91]   = KEY_KPRIGHTPAREN,
      [92]   = KEY_KPSLASH,
      [93]   = KEY_KPASTERISK,
      [94]   = KEY_KPPLUS,
      [95]   = KEY_HELP,
      [96]   = KEY_LEFTSHIFT,
      [97]   = KEY_RIGHTSHIFT,
      [98]   = KEY_CAPSLOCK,
      [99]   = KEY_LEFTCTRL,
      [100]  = KEY_LEFTALT,
      [101]  = KEY_RIGHTALT,
      [102]  = KEY_LEFTMETA,
      [103]  = KEY_RIGHTMETA
};

static const char *amikbd_messages[8] = {
      [0] = KERN_ALERT "amikbd: Ctrl-Amiga-Amiga reset warning!!\n",
      [1] = KERN_WARNING "amikbd: keyboard lost sync\n",
      [2] = KERN_WARNING "amikbd: keyboard buffer overflow\n",
      [3] = KERN_WARNING "amikbd: keyboard controller failure\n",
      [4] = KERN_ERR "amikbd: keyboard selftest failure\n",
      [5] = KERN_INFO "amikbd: initiate power-up key stream\n",
      [6] = KERN_INFO "amikbd: terminate power-up key stream\n",
      [7] = KERN_WARNING "amikbd: keyboard interrupt\n"
};

static struct input_dev *amikbd_dev;

static irqreturn_t amikbd_interrupt(int irq, void *dummy)
{
      unsigned char scancode, down;

      scancode = ~ciaa.sdr;         /* get and invert scancode (keyboard is active low) */
      ciaa.cra |= 0x40;       /* switch SP pin to output for handshake */
      udelay(85);             /* wait until 85 us have expired */
      ciaa.cra &= ~0x40;            /* switch CIA serial port to input mode */

      down = !(scancode & 1);       /* lowest bit is release bit */
      scancode >>= 1;

      if (scancode < 0x78) {        /* scancodes < 0x78 are keys */
            if (scancode == 98) {   /* CapsLock is a toggle switch key on Amiga */
                  input_report_key(amikbd_dev, scancode, 1);
                  input_report_key(amikbd_dev, scancode, 0);
            } else {
                  input_report_key(amikbd_dev, scancode, down);
            }

            input_sync(amikbd_dev);
      } else                        /* scancodes >= 0x78 are error codes */
            printk(amikbd_messages[scancode - 0x78]);

      return IRQ_HANDLED;
}

static int __init amikbd_init(void)
{
      int i, j, err;

      if (!AMIGAHW_PRESENT(AMI_KEYBOARD))
            return -ENODEV;

      if (!request_mem_region(CIAA_PHYSADDR-1+0xb00, 0x100, "amikeyb"))
            return -EBUSY;

      amikbd_dev = input_allocate_device();
      if (!amikbd_dev) {
            printk(KERN_ERR "amikbd: not enough memory for input device\n");
            err = -ENOMEM;
            goto fail1;
      }

      amikbd_dev->name = "Amiga Keyboard";
      amikbd_dev->phys = "amikbd/input0";
      amikbd_dev->id.bustype = BUS_AMIGA;
      amikbd_dev->id.vendor = 0x0001;
      amikbd_dev->id.product = 0x0001;
      amikbd_dev->id.version = 0x0100;

      amikbd_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);

      for (i = 0; i < 0x78; i++)
            set_bit(i, amikbd_dev->keybit);

      for (i = 0; i < MAX_NR_KEYMAPS; i++) {
            static u_short temp_map[NR_KEYS] __initdata;
            if (!key_maps[i])
                  continue;
            memset(temp_map, 0, sizeof(temp_map));
            for (j = 0; j < 0x78; j++) {
                  if (!amikbd_keycode[j])
                        continue;
                  temp_map[j] = key_maps[i][amikbd_keycode[j]];
            }
            for (j = 0; j < NR_KEYS; j++) {
                  if (!temp_map[j])
                        temp_map[j] = 0xf200;
            }
            memcpy(key_maps[i], temp_map, sizeof(temp_map));
      }
      ciaa.cra &= ~0x41;       /* serial data in, turn off TA */
      if (request_irq(IRQ_AMIGA_CIAA_SP, amikbd_interrupt, 0, "amikbd",
                  amikbd_interrupt)) {
            err = -EBUSY;
            goto fail2;
      }

      err = input_register_device(amikbd_dev);
      if (err)
            goto fail3;

      return 0;

 fail3:     free_irq(IRQ_AMIGA_CIAA_SP, amikbd_interrupt);
 fail2:     input_free_device(amikbd_dev);
 fail1:     release_mem_region(CIAA_PHYSADDR - 1 + 0xb00, 0x100);
      return err;
}

static void __exit amikbd_exit(void)
{
      free_irq(IRQ_AMIGA_CIAA_SP, amikbd_interrupt);
      input_unregister_device(amikbd_dev);
      release_mem_region(CIAA_PHYSADDR - 1 + 0xb00, 0x100);
}

module_init(amikbd_init);
module_exit(amikbd_exit);

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