// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  atakbd.c
 *
 *  Copyright (c) 2005 Michael Schmitz
 *
 * Based on amikbd.c, which is
 *
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *      Hamish Macdonald
 */

/*
 * Atari keyboard driver for Linux/m68k
 *
 * The low level init and interrupt stuff is handled in arch/mm68k/atari/atakeyb.c
 * (the keyboard ACIA also handles the mouse and joystick data, and the keyboard
 * interrupt is shared with the MIDI ACIA so MIDI data also get handled there).
 * This driver only deals with handing key events off to the input layer.
 */

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

#include <asm/atariints.h>
#include <asm/atarihw.h>
#include <asm/atarikb.h>
#include <asm/irq.h>

MODULE_AUTHOR("Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>");
MODULE_DESCRIPTION("Atari keyboard driver");
MODULE_LICENSE("GPL");

/*
 0x47: KP_7     71
 0x48: KP_8     72
 0x49: KP_9     73
 0x62: KP_/     98
 0x4b: KP_4     75
 0x4c: KP_5     76
 0x4d: KP_6     77
 0x37: KP_*     55
 0x4f: KP_1     79
 0x50: KP_2     80
 0x51: KP_3     81
 0x4a: KP_-     74
 0x52: KP_0     82
 0x53: KP_.     83
 0x4e: KP_+     78

 0x67: Up       103
 0x6c: Down     108
 0x69: Left     105
 0x6a: Right    106
 */


static unsigned char atakbd_keycode[0x73] = {   /* American layout */
        [1]      = KEY_ESC,
        [2]      = KEY_1,
        [3]      = KEY_2,
        [4]      = KEY_3,
        [5]      = KEY_4,
        [6]      = KEY_5,
        [7]      = KEY_6,
        [8]      = KEY_7,
        [9]      = KEY_8,
        [10]     = KEY_9,
        [11]     = KEY_0,
        [12]     = KEY_MINUS,
        [13]     = KEY_EQUAL,
        [14]     = KEY_BACKSPACE,
        [15]     = KEY_TAB,
        [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,
        [28]     = KEY_ENTER,
        [29]     = KEY_LEFTCTRL,
        [30]     = KEY_A,
        [31]     = KEY_S,
        [32]     = KEY_D,
        [33]     = KEY_F,
        [34]     = KEY_G,
        [35]     = KEY_H,
        [36]     = KEY_J,
        [37]     = KEY_K,
        [38]     = KEY_L,
        [39]     = KEY_SEMICOLON,
        [40]     = KEY_APOSTROPHE,
        [41]     = KEY_GRAVE,
        [42]     = KEY_LEFTSHIFT,
        [43]     = KEY_BACKSLASH,
        [44]     = KEY_Z,
        [45]     = KEY_X,
        [46]     = KEY_C,
        [47]     = KEY_V,
        [48]     = KEY_B,
        [49]     = KEY_N,
        [50]     = KEY_M,
        [51]     = KEY_COMMA,
        [52]     = KEY_DOT,
        [53]     = KEY_SLASH,
        [54]     = KEY_RIGHTSHIFT,
        [55]     = KEY_KPASTERISK,
        [56]     = KEY_LEFTALT,
        [57]     = KEY_SPACE,
        [58]     = KEY_CAPSLOCK,
        [59]     = KEY_F1,
        [60]     = KEY_F2,
        [61]     = KEY_F3,
        [62]     = KEY_F4,
        [63]     = KEY_F5,
        [64]     = KEY_F6,
        [65]     = KEY_F7,
        [66]     = KEY_F8,
        [67]     = KEY_F9,
        [68]     = KEY_F10,
        [71]     = KEY_HOME,
        [72]     = KEY_UP,
        [74]     = KEY_KPMINUS,
        [75]     = KEY_LEFT,
        [77]     = KEY_RIGHT,
        [78]     = KEY_KPPLUS,
        [80]     = KEY_DOWN,
        [82]     = KEY_INSERT,
        [83]     = KEY_DELETE,
        [96]     = KEY_102ND,
        [97]     = KEY_UNDO,
        [98]     = KEY_HELP,
        [99]     = KEY_KPLEFTPAREN,
        [100]    = KEY_KPRIGHTPAREN,
        [101]    = KEY_KPSLASH,
        [102]    = KEY_KPASTERISK,
        [103]    = KEY_KP7,
        [104]    = KEY_KP8,
        [105]    = KEY_KP9,
        [106]    = KEY_KP4,
        [107]    = KEY_KP5,
        [108]    = KEY_KP6,
        [109]    = KEY_KP1,
        [110]    = KEY_KP2,
        [111]    = KEY_KP3,
        [112]    = KEY_KP0,
        [113]    = KEY_KPDOT,
        [114]    = KEY_KPENTER,
};

static struct input_dev *atakbd_dev;

static void atakbd_interrupt(unsigned char scancode, char down)
{

        if (scancode < 0x73) {          /* scancodes < 0xf3 are keys */

                // report raw events here?

                scancode = atakbd_keycode[scancode];

                input_report_key(atakbd_dev, scancode, down);
                input_sync(atakbd_dev);
        } else                          /* scancodes >= 0xf3 are mouse data, most likely */
                printk(KERN_INFO "atakbd: unhandled scancode %x\n", scancode);

        return;
}

static int __init atakbd_init(void)
{
        int i, error;

        if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ST_MFP))
                return -ENODEV;

        // need to init core driver if not already done so
        error = atari_keyb_init();
        if (error)
                return error;

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

        atakbd_dev->name = "Atari Keyboard";
        atakbd_dev->phys = "atakbd/input0";
        atakbd_dev->id.bustype = BUS_HOST;
        atakbd_dev->id.vendor = 0x0001;
        atakbd_dev->id.product = 0x0001;
        atakbd_dev->id.version = 0x0100;

        atakbd_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
        atakbd_dev->keycode = atakbd_keycode;
        atakbd_dev->keycodesize = sizeof(unsigned char);
        atakbd_dev->keycodemax = ARRAY_SIZE(atakbd_keycode);

        for (i = 1; i < 0x72; i++) {
                set_bit(atakbd_keycode[i], atakbd_dev->keybit);
        }

        /* error check */
        error = input_register_device(atakbd_dev);
        if (error) {
                input_free_device(atakbd_dev);
                return error;
        }

        atari_input_keyboard_interrupt_hook = atakbd_interrupt;

        return 0;
}

static void __exit atakbd_exit(void)
{
        atari_input_keyboard_interrupt_hook = NULL;
        input_unregister_device(atakbd_dev);
}

module_init(atakbd_init);
module_exit(atakbd_exit);