// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/macintosh/adbhid.c
 *
 * ADB HID driver for Power Macintosh computers.
 *
 * Adapted from drivers/macintosh/mac_keyb.c by Franz Sirl.
 * drivers/macintosh/mac_keyb.c was Copyright (C) 1996 Paul Mackerras
 * with considerable contributions from Ben Herrenschmidt and others.
 *
 * Copyright (C) 2000 Franz Sirl.
 *
 * Adapted to ADB changes and support for more devices by
 * Benjamin Herrenschmidt. Adapted from code in MkLinux
 * and reworked.
 * 
 * Supported devices:
 *
 * - Standard 1 button mouse
 * - All standard Apple Extended protocol (handler ID 4)
 * - mouseman and trackman mice & trackballs 
 * - PowerBook Trackpad (default setup: enable tapping)
 * - MicroSpeed mouse & trackball (needs testing)
 * - CH Products Trackball Pro (needs testing)
 * - Contour Design (Contour Mouse)
 * - Hunter digital (NoHandsMouse)
 * - Kensignton TurboMouse 5 (needs testing)
 * - Mouse Systems A3 mice and trackballs <aidan@kublai.com>
 * - MacAlly 2-buttons mouse (needs testing) <pochini@denise.shiny.it>
 *
 * To do:
 *
 * Improve Kensington support.
 * Split mouse/kbd
 * Move to syfs
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/input.h>

#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>

#include <asm/machdep.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/backlight.h>
#include <asm/pmac_feature.h>
#endif

MODULE_AUTHOR("Franz Sirl <Franz.Sirl-kernel@lauterbach.com>");

static int restore_capslock_events;
module_param(restore_capslock_events, int, 0644);
MODULE_PARM_DESC(restore_capslock_events,
        "Produce keypress events for capslock on both keyup and keydown.");

#define KEYB_KEYREG     0       /* register # for key up/down data */
#define KEYB_LEDREG     2       /* register # for leds on ADB keyboard */
#define MOUSE_DATAREG   0       /* reg# for movement/button codes from mouse */

static int adb_message_handler(struct notifier_block *, unsigned long, void *);
static struct notifier_block adbhid_adb_notifier = {
        .notifier_call  = adb_message_handler,
};

/* Some special keys */
#define ADB_KEY_DEL             0x33
#define ADB_KEY_CMD             0x37
#define ADB_KEY_CAPSLOCK        0x39
#define ADB_KEY_FN              0x3f
#define ADB_KEY_FWDEL           0x75
#define ADB_KEY_POWER_OLD       0x7e
#define ADB_KEY_POWER           0x7f

static const u16 adb_to_linux_keycodes[128] = {
        /* 0x00 */ KEY_A,               /*  30 */
        /* 0x01 */ KEY_S,               /*  31 */
        /* 0x02 */ KEY_D,               /*  32 */
        /* 0x03 */ KEY_F,               /*  33 */
        /* 0x04 */ KEY_H,               /*  35 */
        /* 0x05 */ KEY_G,               /*  34 */
        /* 0x06 */ KEY_Z,               /*  44 */
        /* 0x07 */ KEY_X,               /*  45 */
        /* 0x08 */ KEY_C,               /*  46 */
        /* 0x09 */ KEY_V,               /*  47 */
        /* 0x0a */ KEY_102ND,           /*  86 */
        /* 0x0b */ KEY_B,               /*  48 */
        /* 0x0c */ KEY_Q,               /*  16 */
        /* 0x0d */ KEY_W,               /*  17 */
        /* 0x0e */ KEY_E,               /*  18 */
        /* 0x0f */ KEY_R,               /*  19 */
        /* 0x10 */ KEY_Y,               /*  21 */
        /* 0x11 */ KEY_T,               /*  20 */
        /* 0x12 */ KEY_1,               /*   2 */
        /* 0x13 */ KEY_2,               /*   3 */
        /* 0x14 */ KEY_3,               /*   4 */
        /* 0x15 */ KEY_4,               /*   5 */
        /* 0x16 */ KEY_6,               /*   7 */
        /* 0x17 */ KEY_5,               /*   6 */
        /* 0x18 */ KEY_EQUAL,           /*  13 */
        /* 0x19 */ KEY_9,               /*  10 */
        /* 0x1a */ KEY_7,               /*   8 */
        /* 0x1b */ KEY_MINUS,           /*  12 */
        /* 0x1c */ KEY_8,               /*   9 */
        /* 0x1d */ KEY_0,               /*  11 */
        /* 0x1e */ KEY_RIGHTBRACE,      /*  27 */
        /* 0x1f */ KEY_O,               /*  24 */
        /* 0x20 */ KEY_U,               /*  22 */
        /* 0x21 */ KEY_LEFTBRACE,       /*  26 */
        /* 0x22 */ KEY_I,               /*  23 */
        /* 0x23 */ KEY_P,               /*  25 */
        /* 0x24 */ KEY_ENTER,           /*  28 */
        /* 0x25 */ KEY_L,               /*  38 */
        /* 0x26 */ KEY_J,               /*  36 */
        /* 0x27 */ KEY_APOSTROPHE,      /*  40 */
        /* 0x28 */ KEY_K,               /*  37 */
        /* 0x29 */ KEY_SEMICOLON,       /*  39 */
        /* 0x2a */ KEY_BACKSLASH,       /*  43 */
        /* 0x2b */ KEY_COMMA,           /*  51 */
        /* 0x2c */ KEY_SLASH,           /*  53 */
        /* 0x2d */ KEY_N,               /*  49 */
        /* 0x2e */ KEY_M,               /*  50 */
        /* 0x2f */ KEY_DOT,             /*  52 */
        /* 0x30 */ KEY_TAB,             /*  15 */
        /* 0x31 */ KEY_SPACE,           /*  57 */
        /* 0x32 */ KEY_GRAVE,           /*  41 */
        /* 0x33 */ KEY_BACKSPACE,       /*  14 */
        /* 0x34 */ KEY_KPENTER,         /*  96 */
        /* 0x35 */ KEY_ESC,             /*   1 */
        /* 0x36 */ KEY_LEFTCTRL,        /*  29 */
        /* 0x37 */ KEY_LEFTMETA,        /* 125 */
        /* 0x38 */ KEY_LEFTSHIFT,       /*  42 */
        /* 0x39 */ KEY_CAPSLOCK,        /*  58 */
        /* 0x3a */ KEY_LEFTALT,         /*  56 */
        /* 0x3b */ KEY_LEFT,            /* 105 */
        /* 0x3c */ KEY_RIGHT,           /* 106 */
        /* 0x3d */ KEY_DOWN,            /* 108 */
        /* 0x3e */ KEY_UP,              /* 103 */
        /* 0x3f */ KEY_FN,              /* 0x1d0 */
        /* 0x40 */ 0,
        /* 0x41 */ KEY_KPDOT,           /*  83 */
        /* 0x42 */ 0,
        /* 0x43 */ KEY_KPASTERISK,      /*  55 */
        /* 0x44 */ 0,
        /* 0x45 */ KEY_KPPLUS,          /*  78 */
        /* 0x46 */ 0,
        /* 0x47 */ KEY_NUMLOCK,         /*  69 */
        /* 0x48 */ 0,
        /* 0x49 */ 0,
        /* 0x4a */ 0,
        /* 0x4b */ KEY_KPSLASH,         /*  98 */
        /* 0x4c */ KEY_KPENTER,         /*  96 */
        /* 0x4d */ 0,
        /* 0x4e */ KEY_KPMINUS,         /*  74 */
        /* 0x4f */ 0,
        /* 0x50 */ 0,
        /* 0x51 */ KEY_KPEQUAL,         /* 117 */
        /* 0x52 */ KEY_KP0,             /*  82 */
        /* 0x53 */ KEY_KP1,             /*  79 */
        /* 0x54 */ KEY_KP2,             /*  80 */
        /* 0x55 */ KEY_KP3,             /*  81 */
        /* 0x56 */ KEY_KP4,             /*  75 */
        /* 0x57 */ KEY_KP5,             /*  76 */
        /* 0x58 */ KEY_KP6,             /*  77 */
        /* 0x59 */ KEY_KP7,             /*  71 */
        /* 0x5a */ 0,
        /* 0x5b */ KEY_KP8,             /*  72 */
        /* 0x5c */ KEY_KP9,             /*  73 */
        /* 0x5d */ KEY_YEN,             /* 124 */
        /* 0x5e */ KEY_RO,              /*  89 */
        /* 0x5f */ KEY_KPCOMMA,         /* 121 */
        /* 0x60 */ KEY_F5,              /*  63 */
        /* 0x61 */ KEY_F6,              /*  64 */
        /* 0x62 */ KEY_F7,              /*  65 */
        /* 0x63 */ KEY_F3,              /*  61 */
        /* 0x64 */ KEY_F8,              /*  66 */
        /* 0x65 */ KEY_F9,              /*  67 */
        /* 0x66 */ KEY_HANJA,           /* 123 */
        /* 0x67 */ KEY_F11,             /*  87 */
        /* 0x68 */ KEY_HANGEUL,         /* 122 */
        /* 0x69 */ KEY_SYSRQ,           /*  99 */
        /* 0x6a */ 0,
        /* 0x6b */ KEY_SCROLLLOCK,      /*  70 */
        /* 0x6c */ 0,
        /* 0x6d */ KEY_F10,             /*  68 */
        /* 0x6e */ KEY_COMPOSE,         /* 127 */
        /* 0x6f */ KEY_F12,             /*  88 */
        /* 0x70 */ 0,
        /* 0x71 */ KEY_PAUSE,           /* 119 */
        /* 0x72 */ KEY_INSERT,          /* 110 */
        /* 0x73 */ KEY_HOME,            /* 102 */
        /* 0x74 */ KEY_PAGEUP,          /* 104 */
        /* 0x75 */ KEY_DELETE,          /* 111 */
        /* 0x76 */ KEY_F4,              /*  62 */
        /* 0x77 */ KEY_END,             /* 107 */
        /* 0x78 */ KEY_F2,              /*  60 */
        /* 0x79 */ KEY_PAGEDOWN,        /* 109 */
        /* 0x7a */ KEY_F1,              /*  59 */
        /* 0x7b */ KEY_RIGHTSHIFT,      /*  54 */
        /* 0x7c */ KEY_RIGHTALT,        /* 100 */
        /* 0x7d */ KEY_RIGHTCTRL,       /*  97 */
        /* 0x7e */ KEY_RIGHTMETA,       /* 126 */
        /* 0x7f */ KEY_POWER,           /* 116 */
};

struct adbhid {
        struct input_dev *input;
        int id;
        int default_id;
        int original_handler_id;
        int current_handler_id;
        int mouse_kind;
        u16 *keycode;
        char name[64];
        char phys[32];
        int flags;
};

#define FLAG_FN_KEY_PRESSED             0x00000001
#define FLAG_POWER_FROM_FN              0x00000002
#define FLAG_EMU_FWDEL_DOWN             0x00000004
#define FLAG_CAPSLOCK_TRANSLATE         0x00000008
#define FLAG_CAPSLOCK_DOWN              0x00000010
#define FLAG_CAPSLOCK_IGNORE_NEXT       0x00000020
#define FLAG_POWER_KEY_PRESSED          0x00000040

static struct adbhid *adbhid[16];

static void adbhid_probe(void);

static void adbhid_input_keycode(int, int, int);

static void init_trackpad(int id);
static void init_trackball(int id);
static void init_turbomouse(int id);
static void init_microspeed(int id);
static void init_ms_a3(int id);

static struct adb_ids keyboard_ids;
static struct adb_ids mouse_ids;
static struct adb_ids buttons_ids;

/* Kind of keyboard, see Apple technote 1152  */
#define ADB_KEYBOARD_UNKNOWN    0
#define ADB_KEYBOARD_ANSI       0x0100
#define ADB_KEYBOARD_ISO        0x0200
#define ADB_KEYBOARD_JIS        0x0300

/* Kind of mouse  */
#define ADBMOUSE_STANDARD_100   0       /* Standard 100cpi mouse (handler 1) */
#define ADBMOUSE_STANDARD_200   1       /* Standard 200cpi mouse (handler 2) */
#define ADBMOUSE_EXTENDED       2       /* Apple Extended mouse (handler 4) */
#define ADBMOUSE_TRACKBALL      3       /* TrackBall (handler 4) */
#define ADBMOUSE_TRACKPAD       4       /* Apple's PowerBook trackpad (handler 4) */
#define ADBMOUSE_TURBOMOUSE5    5       /* Turbomouse 5 (previously req. mousehack) */
#define ADBMOUSE_MICROSPEED     6       /* Microspeed mouse (&trackball ?), MacPoint */
#define ADBMOUSE_TRACKBALLPRO   7       /* Trackball Pro (special buttons) */
#define ADBMOUSE_MS_A3          8       /* Mouse systems A3 trackball (handler 3) */
#define ADBMOUSE_MACALLY2       9       /* MacAlly 2-button mouse */

static void
adbhid_keyboard_input(unsigned char *data, int nb, int apoll)
{
        int id = (data[0] >> 4) & 0x0f;

        if (!adbhid[id]) {
                pr_err("ADB HID on ID %d not yet registered, packet %#02x, %#02x, %#02x, %#02x\n",
                       id, data[0], data[1], data[2], data[3]);
                return;
        }

        /* first check this is from register 0 */
        if (nb != 3 || (data[0] & 3) != KEYB_KEYREG)
                return;         /* ignore it */
        adbhid_input_keycode(id, data[1], 0);
        if (!(data[2] == 0xff || (data[2] == 0x7f && data[1] == 0x7f)))
                adbhid_input_keycode(id, data[2], 0);
}

static void
adbhid_input_keycode(int id, int scancode, int repeat)
{
        struct adbhid *ahid = adbhid[id];
        int keycode, up_flag, key;

        keycode = scancode & 0x7f;
        up_flag = scancode & 0x80;

        if (restore_capslock_events) {
                if (keycode == ADB_KEY_CAPSLOCK && !up_flag) {
                        /* Key pressed, turning on the CapsLock LED.
                         * The next 0xff will be interpreted as a release. */
                        if (ahid->flags & FLAG_CAPSLOCK_IGNORE_NEXT) {
                                /* Throw away this key event if it happens
                                 * just after resume. */
                                ahid->flags &= ~FLAG_CAPSLOCK_IGNORE_NEXT;
                                return;
                        } else {
                                ahid->flags |= FLAG_CAPSLOCK_TRANSLATE
                                        | FLAG_CAPSLOCK_DOWN;
                        }
                } else if (scancode == 0xff &&
                           !(ahid->flags & FLAG_POWER_KEY_PRESSED)) {
                        /* Scancode 0xff usually signifies that the capslock
                         * key was either pressed or released, or that the
                         * power button was released. */
                        if (ahid->flags & FLAG_CAPSLOCK_TRANSLATE) {
                                keycode = ADB_KEY_CAPSLOCK;
                                if (ahid->flags & FLAG_CAPSLOCK_DOWN) {
                                        /* Key released */
                                        up_flag = 1;
                                        ahid->flags &= ~FLAG_CAPSLOCK_DOWN;
                                } else {
                                        /* Key pressed */
                                        up_flag = 0;
                                        ahid->flags &= ~FLAG_CAPSLOCK_TRANSLATE;
                                }
                        } else {
                                pr_info("Spurious caps lock event (scancode 0xff).\n");
                        }
                }
        }

        switch (keycode) {
        case ADB_KEY_CAPSLOCK:
                if (!restore_capslock_events) {
                        /* Generate down/up events for CapsLock every time. */
                        input_report_key(ahid->input, KEY_CAPSLOCK, 1);
                        input_sync(ahid->input);
                        input_report_key(ahid->input, KEY_CAPSLOCK, 0);
                        input_sync(ahid->input);
                        return;
                }
                break;
#ifdef CONFIG_PPC_PMAC
        case ADB_KEY_POWER_OLD: /* Power key on PBook 3400 needs remapping */
                switch(pmac_call_feature(PMAC_FTR_GET_MB_INFO,
                        NULL, PMAC_MB_INFO_MODEL, 0)) {
                case PMAC_TYPE_COMET:
                case PMAC_TYPE_HOOPER:
                case PMAC_TYPE_KANGA:
                        keycode = ADB_KEY_POWER;
                }
                break;
        case ADB_KEY_POWER:
                /* Keep track of the power key state */
                if (up_flag)
                        ahid->flags &= ~FLAG_POWER_KEY_PRESSED;
                else
                        ahid->flags |= FLAG_POWER_KEY_PRESSED;

                /* Fn + Command will produce a bogus "power" keycode */
                if (ahid->flags & FLAG_FN_KEY_PRESSED) {
                        keycode = ADB_KEY_CMD;
                        if (up_flag)
                                ahid->flags &= ~FLAG_POWER_FROM_FN;
                        else
                                ahid->flags |= FLAG_POWER_FROM_FN;
                } else if (ahid->flags & FLAG_POWER_FROM_FN) {
                        keycode = ADB_KEY_CMD;
                        ahid->flags &= ~FLAG_POWER_FROM_FN;
                }
                break;
        case ADB_KEY_FN:
                /* Keep track of the Fn key state */
                if (up_flag) {
                        ahid->flags &= ~FLAG_FN_KEY_PRESSED;
                        /* Emulate Fn+delete = forward delete */
                        if (ahid->flags & FLAG_EMU_FWDEL_DOWN) {
                                ahid->flags &= ~FLAG_EMU_FWDEL_DOWN;
                                keycode = ADB_KEY_FWDEL;
                                break;
                        }
                } else
                        ahid->flags |= FLAG_FN_KEY_PRESSED;
                break;
        case ADB_KEY_DEL:
                /* Emulate Fn+delete = forward delete */
                if (ahid->flags & FLAG_FN_KEY_PRESSED) {
                        keycode = ADB_KEY_FWDEL;
                        if (up_flag)
                                ahid->flags &= ~FLAG_EMU_FWDEL_DOWN;
                        else
                                ahid->flags |= FLAG_EMU_FWDEL_DOWN;
                }
                break;
#endif /* CONFIG_PPC_PMAC */
        }

        key = adbhid[id]->keycode[keycode];
        if (key) {
                input_report_key(adbhid[id]->input, key, !up_flag);
                input_sync(adbhid[id]->input);
        } else
                pr_info("Unhandled ADB key (scancode %#02x) %s.\n", keycode,
                        up_flag ? "released" : "pressed");

}

static void
adbhid_mouse_input(unsigned char *data, int nb, int autopoll)
{
        int id = (data[0] >> 4) & 0x0f;

        if (!adbhid[id]) {
                pr_err("ADB HID on ID %d not yet registered\n", id);
                return;
        }

  /*
    Handler 1 -- 100cpi original Apple mouse protocol.
    Handler 2 -- 200cpi original Apple mouse protocol.

    For Apple's standard one-button mouse protocol the data array will
    contain the following values:

                BITS    COMMENTS
    data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd.
    data[1] = bxxx xxxx First button and x-axis motion.
    data[2] = byyy yyyy Second button and y-axis motion.

    Handler 4 -- Apple Extended mouse protocol.

    For Apple's 3-button mouse protocol the data array will contain the
    following values:

                BITS    COMMENTS
    data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd.
    data[1] = bxxx xxxx Left button and x-axis motion.
    data[2] = byyy yyyy Second button and y-axis motion.
    data[3] = byyy bxxx Third button and fourth button.  Y is additional
              high bits of y-axis motion.  XY is additional
              high bits of x-axis motion.

    MacAlly 2-button mouse protocol.

    For MacAlly 2-button mouse protocol the data array will contain the
    following values:

                BITS    COMMENTS
    data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd.
    data[1] = bxxx xxxx Left button and x-axis motion.
    data[2] = byyy yyyy Right button and y-axis motion.
    data[3] = ???? ???? unknown
    data[4] = ???? ???? unknown

  */

        /* If it's a trackpad, we alias the second button to the first.
           NOTE: Apple sends an ADB flush command to the trackpad when
                 the first (the real) button is released. We could do
                 this here using async flush requests.
        */
        switch (adbhid[id]->mouse_kind)
        {
            case ADBMOUSE_TRACKPAD:
                data[1] = (data[1] & 0x7f) | ((data[1] & data[2]) & 0x80);
                data[2] = data[2] | 0x80;
                break;
            case ADBMOUSE_MICROSPEED:
                data[1] = (data[1] & 0x7f) | ((data[3] & 0x01) << 7);
                data[2] = (data[2] & 0x7f) | ((data[3] & 0x02) << 6);
                data[3] = (data[3] & 0x77) | ((data[3] & 0x04) << 5)
                        | (data[3] & 0x08);
                break;
            case ADBMOUSE_TRACKBALLPRO:
                data[1] = (data[1] & 0x7f) | (((data[3] & 0x04) << 5)
                        & ((data[3] & 0x08) << 4));
                data[2] = (data[2] & 0x7f) | ((data[3] & 0x01) << 7);
                data[3] = (data[3] & 0x77) | ((data[3] & 0x02) << 6);
                break;
            case ADBMOUSE_MS_A3:
                data[1] = (data[1] & 0x7f) | ((data[3] & 0x01) << 7);
                data[2] = (data[2] & 0x7f) | ((data[3] & 0x02) << 6);
                data[3] = ((data[3] & 0x04) << 5);
                break;
            case ADBMOUSE_MACALLY2:
                data[3] = (data[2] & 0x80) ? 0x80 : 0x00;
                data[2] |= 0x80;  /* Right button is mapped as button 3 */
                nb=4;
                break;
        }

        input_report_key(adbhid[id]->input, BTN_LEFT,   !((data[1] >> 7) & 1));
        input_report_key(adbhid[id]->input, BTN_MIDDLE, !((data[2] >> 7) & 1));

        if (nb >= 4 && adbhid[id]->mouse_kind != ADBMOUSE_TRACKPAD)
                input_report_key(adbhid[id]->input, BTN_RIGHT,  !((data[3] >> 7) & 1));

        input_report_rel(adbhid[id]->input, REL_X,
                         ((data[2]&0x7f) < 64 ? (data[2]&0x7f) : (data[2]&0x7f)-128 ));
        input_report_rel(adbhid[id]->input, REL_Y,
                         ((data[1]&0x7f) < 64 ? (data[1]&0x7f) : (data[1]&0x7f)-128 ));

        input_sync(adbhid[id]->input);
}

static void
adbhid_buttons_input(unsigned char *data, int nb, int autopoll)
{
        int id = (data[0] >> 4) & 0x0f;

        if (!adbhid[id]) {
                pr_err("ADB HID on ID %d not yet registered\n", id);
                return;
        }

        switch (adbhid[id]->original_handler_id) {
        default:
        case 0x02: /* Adjustable keyboard button device */
          {
                int down = (data[1] == (data[1] & 0xf));

                switch (data[1] & 0x0f) {
                case 0x0:       /* microphone */
                        input_report_key(adbhid[id]->input, KEY_SOUND, down);
                        break;

                case 0x1:       /* mute */
                        input_report_key(adbhid[id]->input, KEY_MUTE, down);
                        break;

                case 0x2:       /* volume decrease */
                        input_report_key(adbhid[id]->input, KEY_VOLUMEDOWN, down);
                        break;

                case 0x3:       /* volume increase */
                        input_report_key(adbhid[id]->input, KEY_VOLUMEUP, down);
                        break;

                default:
                        pr_info("Unhandled ADB_MISC event %02x, %02x, %02x, %02x\n",
                                data[0], data[1], data[2], data[3]);
                        break;
                }
          }
          break;

        case 0x1f: /* Powerbook button device */
          {
                int down = (data[1] == (data[1] & 0xf));

                /*
                 * XXX: Where is the contrast control for the passive?
                 *  -- Cort
                 */

                switch (data[1] & 0x0f) {
                case 0x8:       /* mute */
                        input_report_key(adbhid[id]->input, KEY_MUTE, down);
                        break;

                case 0x7:       /* volume decrease */
                        input_report_key(adbhid[id]->input, KEY_VOLUMEDOWN, down);
                        break;

                case 0x6:       /* volume increase */
                        input_report_key(adbhid[id]->input, KEY_VOLUMEUP, down);
                        break;

                case 0xb:       /* eject */
                        input_report_key(adbhid[id]->input, KEY_EJECTCD, down);
                        break;

                case 0xa:       /* brightness decrease */
#ifdef CONFIG_PMAC_BACKLIGHT
                        if (down)
                                pmac_backlight_key_down();
#endif
                        input_report_key(adbhid[id]->input, KEY_BRIGHTNESSDOWN, down);
                        break;

                case 0x9:       /* brightness increase */
#ifdef CONFIG_PMAC_BACKLIGHT
                        if (down)
                                pmac_backlight_key_up();
#endif
                        input_report_key(adbhid[id]->input, KEY_BRIGHTNESSUP, down);
                        break;

                case 0xc:       /* videomode switch */
                        input_report_key(adbhid[id]->input, KEY_SWITCHVIDEOMODE, down);
                        break;

                case 0xd:       /* keyboard illumination toggle */
                        input_report_key(adbhid[id]->input, KEY_KBDILLUMTOGGLE, down);
                        break;

                case 0xe:       /* keyboard illumination decrease */
                        input_report_key(adbhid[id]->input, KEY_KBDILLUMDOWN, down);
                        break;

                case 0xf:
                        switch (data[1]) {
                        case 0x8f:
                        case 0x0f:
                                /* keyboard illumination increase */
                                input_report_key(adbhid[id]->input, KEY_KBDILLUMUP, down);
                                break;

                        case 0x7f:
                        case 0xff:
                                /* keypad overlay toogle */
                                break;

                        default:
                                pr_info("Unhandled ADB_MISC event %02x, %02x, %02x, %02x\n",
                                        data[0], data[1], data[2], data[3]);
                                break;
                        }
                        break;
                default:
                        pr_info("Unhandled ADB_MISC event %02x, %02x, %02x, %02x\n",
                                data[0], data[1], data[2], data[3]);
                        break;
                }
          }
          break;
        }

        input_sync(adbhid[id]->input);
}

static struct adb_request led_request;
static int leds_pending[16];
static int leds_req_pending;
static int pending_devs[16];
static int pending_led_start;
static int pending_led_end;
static DEFINE_SPINLOCK(leds_lock);

static void leds_done(struct adb_request *req)
{
        int leds = 0, device = 0, pending = 0;
        unsigned long flags;

        spin_lock_irqsave(&leds_lock, flags);

        if (pending_led_start != pending_led_end) {
                device = pending_devs[pending_led_start];
                leds = leds_pending[device] & 0xff;
                leds_pending[device] = 0;
                pending_led_start++;
                pending_led_start = (pending_led_start < 16) ? pending_led_start : 0;
                pending = leds_req_pending;
        } else
                leds_req_pending = 0;
        spin_unlock_irqrestore(&leds_lock, flags);
        if (pending)
                adb_request(&led_request, leds_done, 0, 3,
                            ADB_WRITEREG(device, KEYB_LEDREG), 0xff, ~leds);
}

static void real_leds(unsigned char leds, int device)
{
        unsigned long flags;

        spin_lock_irqsave(&leds_lock, flags);
        if (!leds_req_pending) {
                leds_req_pending = 1;
                spin_unlock_irqrestore(&leds_lock, flags);             
                adb_request(&led_request, leds_done, 0, 3,
                            ADB_WRITEREG(device, KEYB_LEDREG), 0xff, ~leds);
                return;
        } else {
                if (!(leds_pending[device] & 0x100)) {
                        pending_devs[pending_led_end] = device;
                        pending_led_end++;
                        pending_led_end = (pending_led_end < 16) ? pending_led_end : 0;
                }
                leds_pending[device] = leds | 0x100;
        }
        spin_unlock_irqrestore(&leds_lock, flags);             
}

/*
 * Event callback from the input module. Events that change the state of
 * the hardware are processed here.
 */
static int adbhid_kbd_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
        struct adbhid *adbhid = input_get_drvdata(dev);
        unsigned char leds;

        switch (type) {
        case EV_LED:
                leds =  (test_bit(LED_SCROLLL, dev->led) ? 4 : 0) |
                        (test_bit(LED_NUML,    dev->led) ? 1 : 0) |
                        (test_bit(LED_CAPSL,   dev->led) ? 2 : 0);
                real_leds(leds, adbhid->id);
                return 0;
        }

        return -1;
}

static void
adbhid_kbd_capslock_remember(void)
{
        struct adbhid *ahid;
        int i;

        for (i = 1; i < 16; i++) {
                ahid = adbhid[i];

                if (ahid && ahid->id == ADB_KEYBOARD)
                        if (ahid->flags & FLAG_CAPSLOCK_TRANSLATE)
                                ahid->flags |= FLAG_CAPSLOCK_IGNORE_NEXT;
        }
}

static int
adb_message_handler(struct notifier_block *this, unsigned long code, void *x)
{
        switch (code) {
        case ADB_MSG_PRE_RESET:
        case ADB_MSG_POWERDOWN:
                /* Stop the repeat timer. Autopoll is already off at this point */
                {
                        int i;
                        for (i = 1; i < 16; i++) {
                                if (adbhid[i])
                                        del_timer_sync(&adbhid[i]->input->timer);
                        }
                }

                /* Stop pending led requests */
                while (leds_req_pending)
                        adb_poll();

                /* After resume, and if the capslock LED is on, the PMU will
                 * send a "capslock down" key event. This confuses the
                 * restore_capslock_events logic. Remember if the capslock
                 * LED was on before suspend so the unwanted key event can
                 * be ignored after resume. */
                if (restore_capslock_events)
                        adbhid_kbd_capslock_remember();

                break;

        case ADB_MSG_POST_RESET:
                adbhid_probe();
                break;
        }
        return NOTIFY_DONE;
}

static int
adbhid_input_register(int id, int default_id, int original_handler_id,
                      int current_handler_id, int mouse_kind)
{
        struct adbhid *hid;
        struct input_dev *input_dev;
        int err;
        int i;
        char *keyboard_type;

        if (adbhid[id]) {
                pr_err("Trying to reregister ADB HID on ID %d\n", id);
                return -EEXIST;
        }

        adbhid[id] = hid = kzalloc(sizeof(struct adbhid), GFP_KERNEL);
        input_dev = input_allocate_device();
        if (!hid || !input_dev) {
                err = -ENOMEM;
                goto fail;
        }

        sprintf(hid->phys, "adb%d:%d.%02x/input", id, default_id, original_handler_id);

        hid->input = input_dev;
        hid->id = default_id;
        hid->original_handler_id = original_handler_id;
        hid->current_handler_id = current_handler_id;
        hid->mouse_kind = mouse_kind;
        hid->flags = 0;
        input_set_drvdata(input_dev, hid);
        input_dev->name = hid->name;
        input_dev->phys = hid->phys;
        input_dev->id.bustype = BUS_ADB;
        input_dev->id.vendor = 0x0001;
        input_dev->id.product = (id << 12) | (default_id << 8) | original_handler_id;
        input_dev->id.version = 0x0100;

        switch (default_id) {
        case ADB_KEYBOARD:
                hid->keycode = kmalloc(sizeof(adb_to_linux_keycodes), GFP_KERNEL);
                if (!hid->keycode) {
                        err = -ENOMEM;
                        goto fail;
                }

                sprintf(hid->name, "ADB keyboard");

                memcpy(hid->keycode, adb_to_linux_keycodes, sizeof(adb_to_linux_keycodes));

                switch (original_handler_id) {
                default:
                        keyboard_type = "<unknown>";
                        input_dev->id.version = ADB_KEYBOARD_UNKNOWN;
                        break;

                case 0x01: case 0x02: case 0x03: case 0x06: case 0x08:
                case 0x0C: case 0x10: case 0x18: case 0x1B: case 0x1C:
                case 0xC0: case 0xC3: case 0xC6:
                        keyboard_type = "ANSI";
                        input_dev->id.version = ADB_KEYBOARD_ANSI;
                        break;

                case 0x04: case 0x05: case 0x07: case 0x09: case 0x0D:
                case 0x11: case 0x14: case 0x19: case 0x1D: case 0xC1:
                case 0xC4: case 0xC7:
                        keyboard_type = "ISO, swapping keys";
                        input_dev->id.version = ADB_KEYBOARD_ISO;
                        i = hid->keycode[10];
                        hid->keycode[10] = hid->keycode[50];
                        hid->keycode[50] = i;
                        break;

                case 0x12: case 0x15: case 0x16: case 0x17: case 0x1A:
                case 0x1E: case 0xC2: case 0xC5: case 0xC8: case 0xC9:
                        keyboard_type = "JIS";
                        input_dev->id.version = ADB_KEYBOARD_JIS;
                        break;
                }
                pr_info("Detected ADB keyboard, type %s.\n", keyboard_type);

                for (i = 0; i < 128; i++)
                        if (hid->keycode[i])
                                set_bit(hid->keycode[i], input_dev->keybit);

                input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
                        BIT_MASK(EV_REP);
                input_dev->ledbit[0] = BIT_MASK(LED_SCROLLL) |
                        BIT_MASK(LED_CAPSL) | BIT_MASK(LED_NUML);
                input_dev->event = adbhid_kbd_event;
                input_dev->keycodemax = KEY_FN;
                input_dev->keycodesize = sizeof(hid->keycode[0]);
                break;

        case ADB_MOUSE:
                sprintf(hid->name, "ADB mouse");

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

        case ADB_MISC:
                switch (original_handler_id) {
                case 0x02: /* Adjustable keyboard button device */
                        sprintf(hid->name, "ADB adjustable keyboard buttons");
                        input_dev->evbit[0] = BIT_MASK(EV_KEY) |
                                BIT_MASK(EV_REP);
                        set_bit(KEY_SOUND, input_dev->keybit);
                        set_bit(KEY_MUTE, input_dev->keybit);
                        set_bit(KEY_VOLUMEUP, input_dev->keybit);
                        set_bit(KEY_VOLUMEDOWN, input_dev->keybit);
                        break;
                case 0x1f: /* Powerbook button device */
                        sprintf(hid->name, "ADB Powerbook buttons");
                        input_dev->evbit[0] = BIT_MASK(EV_KEY) |
                                BIT_MASK(EV_REP);
                        set_bit(KEY_MUTE, input_dev->keybit);
                        set_bit(KEY_VOLUMEUP, input_dev->keybit);
                        set_bit(KEY_VOLUMEDOWN, input_dev->keybit);
                        set_bit(KEY_BRIGHTNESSUP, input_dev->keybit);
                        set_bit(KEY_BRIGHTNESSDOWN, input_dev->keybit);
                        set_bit(KEY_EJECTCD, input_dev->keybit);
                        set_bit(KEY_SWITCHVIDEOMODE, input_dev->keybit);
                        set_bit(KEY_KBDILLUMTOGGLE, input_dev->keybit);
                        set_bit(KEY_KBDILLUMDOWN, input_dev->keybit);
                        set_bit(KEY_KBDILLUMUP, input_dev->keybit);
                        break;
                }
                if (hid->name[0])
                        break;
                fallthrough;

        default:
                pr_info("Trying to register unknown ADB device to input layer.\n");
                err = -ENODEV;
                goto fail;
        }

        input_dev->keycode = hid->keycode;

        err = input_register_device(input_dev);
        if (err)
                goto fail;

        if (default_id == ADB_KEYBOARD) {
                /* HACK WARNING!! This should go away as soon there is an utility
                 * to control that for event devices.
                 */
                input_dev->rep[REP_DELAY] = 500;   /* input layer default: 250 */
                input_dev->rep[REP_PERIOD] = 66; /* input layer default: 33 */
        }

        return 0;

 fail:  input_free_device(input_dev);
        if (hid) {
                kfree(hid->keycode);
                kfree(hid);
        }
        adbhid[id] = NULL;
        return err;
}

static void adbhid_input_unregister(int id)
{
        input_unregister_device(adbhid[id]->input);
        kfree(adbhid[id]->keycode);
        kfree(adbhid[id]);
        adbhid[id] = NULL;
}


static u16
adbhid_input_reregister(int id, int default_id, int org_handler_id,
                        int cur_handler_id, int mk)
{
        if (adbhid[id]) {
                if (adbhid[id]->input->id.product !=
                    ((id << 12)|(default_id << 8)|org_handler_id)) {
                        adbhid_input_unregister(id);
                        adbhid_input_register(id, default_id, org_handler_id,
                                              cur_handler_id, mk);
                }
        } else
                adbhid_input_register(id, default_id, org_handler_id,
                                      cur_handler_id, mk);
        return 1<<id;
}

static void
adbhid_input_devcleanup(u16 exist)
{
        int i;
        for(i=1; i<16; i++)
                if (adbhid[i] && !(exist&(1<<i)))
                        adbhid_input_unregister(i);
}

static void
adbhid_probe(void)
{
        struct adb_request req;
        int i, default_id, org_handler_id, cur_handler_id;
        u16 reg = 0;

        adb_register(ADB_MOUSE, 0, &mouse_ids, adbhid_mouse_input);
        adb_register(ADB_KEYBOARD, 0, &keyboard_ids, adbhid_keyboard_input);
        adb_register(ADB_MISC, 0, &buttons_ids, adbhid_buttons_input);

        for (i = 0; i < keyboard_ids.nids; i++) {
                int id = keyboard_ids.id[i];

                adb_get_infos(id, &default_id, &org_handler_id);

                /* turn off all leds */
                adb_request(&req, NULL, ADBREQ_SYNC, 3,
                            ADB_WRITEREG(id, KEYB_LEDREG), 0xff, 0xff);

                /* Enable full feature set of the keyboard
                   ->get it to send separate codes for left and right shift,
                   control, option keys */
#if 0           /* handler 5 doesn't send separate codes for R modifiers */
                if (!adb_try_handler_change(id, 5))
#endif
                adb_try_handler_change(id, 3);

                adb_get_infos(id, &default_id, &cur_handler_id);
                printk(KERN_DEBUG "ADB keyboard at %d has handler 0x%X\n",
                       id, cur_handler_id);
                reg |= adbhid_input_reregister(id, default_id, org_handler_id,
                                               cur_handler_id, 0);
        }

        for (i = 0; i < buttons_ids.nids; i++) {
                int id = buttons_ids.id[i];

                adb_get_infos(id, &default_id, &org_handler_id);
                reg |= adbhid_input_reregister(id, default_id, org_handler_id,
                                               org_handler_id, 0);
        }

        /* Try to switch all mice to handler 4, or 2 for three-button
           mode and full resolution. */
        for (i = 0; i < mouse_ids.nids; i++) {
                int id = mouse_ids.id[i];
                int mouse_kind;
                char *desc = "standard";

                adb_get_infos(id, &default_id, &org_handler_id);

                if (adb_try_handler_change(id, 4)) {
                        mouse_kind = ADBMOUSE_EXTENDED;
                }
                else if (adb_try_handler_change(id, 0x2F)) {
                        mouse_kind = ADBMOUSE_MICROSPEED;
                }
                else if (adb_try_handler_change(id, 0x42)) {
                        mouse_kind = ADBMOUSE_TRACKBALLPRO;
                }
                else if (adb_try_handler_change(id, 0x66)) {
                        mouse_kind = ADBMOUSE_MICROSPEED;
                }
                else if (adb_try_handler_change(id, 0x5F)) {
                        mouse_kind = ADBMOUSE_MICROSPEED;
                }
                else if (adb_try_handler_change(id, 3)) {
                        mouse_kind = ADBMOUSE_MS_A3;
                }
                else if (adb_try_handler_change(id, 2)) {
                        mouse_kind = ADBMOUSE_STANDARD_200;
                }
                else {
                        mouse_kind = ADBMOUSE_STANDARD_100;
                }

                if ((mouse_kind == ADBMOUSE_TRACKBALLPRO)
                    || (mouse_kind == ADBMOUSE_MICROSPEED)) {
                        desc = "Microspeed/MacPoint or compatible";
                        init_microspeed(id);
                } else if (mouse_kind == ADBMOUSE_MS_A3) {
                        desc = "Mouse Systems A3 Mouse or compatible";
                        init_ms_a3(id);
                } else if (mouse_kind ==  ADBMOUSE_EXTENDED) {
                        desc = "extended";
                        /*
                         * Register 1 is usually used for device
                         * identification.  Here, we try to identify
                         * a known device and call the appropriate
                         * init function.
                         */
                        adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
                                    ADB_READREG(id, 1));

                        if ((req.reply_len) &&
                            (req.reply[1] == 0x9a) && ((req.reply[2] == 0x21)
                                || (req.reply[2] == 0x20))) {
                                mouse_kind = ADBMOUSE_TRACKBALL;
                                desc = "trackman/mouseman";
                                init_trackball(id);
                        }
                        else if ((req.reply_len >= 4) &&
                            (req.reply[1] == 0x74) && (req.reply[2] == 0x70) &&
                            (req.reply[3] == 0x61) && (req.reply[4] == 0x64)) {
                                mouse_kind = ADBMOUSE_TRACKPAD;
                                desc = "trackpad";
                                init_trackpad(id);
                        }
                        else if ((req.reply_len >= 4) &&
                            (req.reply[1] == 0x4b) && (req.reply[2] == 0x4d) &&
                            (req.reply[3] == 0x4c) && (req.reply[4] == 0x31)) {
                                mouse_kind = ADBMOUSE_TURBOMOUSE5;
                                desc = "TurboMouse 5";
                                init_turbomouse(id);
                        }
                        else if ((req.reply_len == 9) &&
                            (req.reply[1] == 0x4b) && (req.reply[2] == 0x4f) &&
                            (req.reply[3] == 0x49) && (req.reply[4] == 0x54)) {
                                if (adb_try_handler_change(id, 0x42)) {
                                        mouse_kind = ADBMOUSE_MACALLY2;
                                        desc = "MacAlly 2-button";
                                }
                        }
                }

                adb_get_infos(id, &default_id, &cur_handler_id);
                printk(KERN_DEBUG "ADB mouse (%s) at %d has handler 0x%X\n",
                       desc, id, cur_handler_id);
                reg |= adbhid_input_reregister(id, default_id, org_handler_id,
                                               cur_handler_id, mouse_kind);
        }
        adbhid_input_devcleanup(reg);
}

static void 
init_trackpad(int id)
{
        struct adb_request req;
        unsigned char r1_buffer[8];

        adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
                    ADB_READREG(id,1));
        if (req.reply_len < 8)
                pr_err("%s: bad length for reg. 1\n", __func__);
        else
        {
            memcpy(r1_buffer, &req.reply[1], 8);

            adb_request(&req, NULL, ADBREQ_SYNC, 9,
                ADB_WRITEREG(id,1),
                    r1_buffer[0],
                    r1_buffer[1],
                    r1_buffer[2],
                    r1_buffer[3],
                    r1_buffer[4],
                    r1_buffer[5],
                    0x0d,
                    r1_buffer[7]);

            adb_request(&req, NULL, ADBREQ_SYNC, 9,
                ADB_WRITEREG(id,2),
                    0x99,
                    0x94,
                    0x19,
                    0xff,
                    0xb2,
                    0x8a,
                    0x1b,
                    0x50);

            adb_request(&req, NULL, ADBREQ_SYNC, 9,
                ADB_WRITEREG(id,1),
                    r1_buffer[0],
                    r1_buffer[1],
                    r1_buffer[2],
                    r1_buffer[3],
                    r1_buffer[4],
                    r1_buffer[5],
                    0x03, /*r1_buffer[6],*/
                    r1_buffer[7]);

            /* Without this flush, the trackpad may be locked up */
            adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(id));
        }
}

static void 
init_trackball(int id)
{
        struct adb_request req;

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 00,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 01,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 02,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 03,0x38);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 00,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 01,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 02,0x81);

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id,1), 03,0x38);
}

static void
init_turbomouse(int id)
{
        struct adb_request req;

        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(id));

        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(3));

        adb_request(&req, NULL, ADBREQ_SYNC, 9,
        ADB_WRITEREG(3,2),
            0xe7,
            0x8c,
            0,
            0,
            0,
            0xff,
            0xff,
            0x94);

        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(3));

        adb_request(&req, NULL, ADBREQ_SYNC, 9,
        ADB_WRITEREG(3,2),
            0xa5,
            0x14,
            0,
            0,
            0x69,
            0xff,
            0xff,
            0x27);
}

static void
init_microspeed(int id)
{
        struct adb_request req;

        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(id));

        /* This will initialize mice using the Microspeed, MacPoint and
           other compatible firmware. Bit 12 enables extended protocol.
           
           Register 1 Listen (4 Bytes)
            0 -  3     Button is mouse (set also for double clicking!!!)
            4 -  7     Button is locking (affects change speed also)
            8 - 11     Button changes speed
           12          1 = Extended mouse mode, 0 = normal mouse mode
           13 - 15     unused 0
           16 - 23     normal speed
           24 - 31     changed speed

       Register 1 talk holds version and product identification information.
       Register 1 Talk (4 Bytes):
            0 -  7     Product code
            8 - 23     undefined, reserved
           24 - 31     Version number
        
       Speed 0 is max. 1 to 255 set speed in increments of 1/256 of max.
 */
        adb_request(&req, NULL, ADBREQ_SYNC, 5,
        ADB_WRITEREG(id,1),
            0x20,       /* alt speed = 0x20 (rather slow) */
            0x00,       /* norm speed = 0x00 (fastest) */
            0x10,       /* extended protocol, no speed change */
            0x07);      /* all buttons enabled as mouse buttons, no locking */


        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(id));
}

static void
init_ms_a3(int id)
{
        struct adb_request req;

        adb_request(&req, NULL, ADBREQ_SYNC, 3,
        ADB_WRITEREG(id, 0x2),
            0x00,
            0x07);
 
        adb_request(&req, NULL, ADBREQ_SYNC, 1, ADB_FLUSH(id));
}

static int __init adbhid_init(void)
{
#ifndef CONFIG_MAC
        if (!machine_is(chrp) && !machine_is(powermac))
                return 0;
#endif

        led_request.complete = 1;

        adbhid_probe();

        blocking_notifier_chain_register(&adb_client_list,
                        &adbhid_adb_notifier);

        return 0;
}

static void __exit adbhid_exit(void)
{
}
 
module_init(adbhid_init);
module_exit(adbhid_exit);