/*

 * QEMU PS/2 keyboard/mouse emulation

 *

 * Copyright (c) 2003 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "ps2.h"

#include "console.h"

#include "gui.h"

/* debug PC keyboard */

//#define DEBUG_KBD

/* debug PC keyboard : only mouse */

//#define DEBUG_MOUSE

/* Keyboard Commands */

#define KBD_CMD_SET_LEDS	0xED	/* Set keyboard leds */

#define KBD_CMD_ECHO     	0xEE

#define KBD_CMD_SCANCODE	0xF0	/* Get/set scancode set */

#define KBD_CMD_GET_ID 	        0xF2	/* get keyboard ID */

#define KBD_CMD_SET_RATE	0xF3	/* Set typematic rate */

#define KBD_CMD_ENABLE		0xF4	/* Enable scanning */

#define KBD_CMD_RESET_DISABLE	0xF5	/* reset and disable scanning */

#define KBD_CMD_RESET_ENABLE   	0xF6    /* reset and enable scanning */

#define KBD_CMD_RESET		0xFF	/* Reset */

/* Keyboard Replies */

#define KBD_REPLY_POR		0xAA	/* Power on reset */

#define KBD_REPLY_ID		0xAB	/* Keyboard ID */

#define KBD_REPLY_ACK		0xFA	/* Command ACK */

#define KBD_REPLY_RESEND	0xFE	/* Command NACK, send the cmd again */

/* Mouse Commands */

#define AUX_SET_SCALE11		0xE6	/* Set 1:1 scaling */

#define AUX_SET_SCALE21		0xE7	/* Set 2:1 scaling */

#define AUX_SET_RES		0xE8	/* Set resolution */

#define AUX_GET_SCALE		0xE9	/* Get scaling factor */

#define AUX_SET_STREAM		0xEA	/* Set stream mode */

#define AUX_POLL		0xEB	/* Poll */

#define AUX_RESET_WRAP		0xEC	/* Reset wrap mode */

#define AUX_SET_WRAP		0xEE	/* Set wrap mode */

#define AUX_SET_REMOTE		0xF0	/* Set remote mode */

#define AUX_GET_TYPE		0xF2	/* Get type */

#define AUX_SET_SAMPLE		0xF3	/* Set sample rate */

#define AUX_ENABLE_DEV		0xF4	/* Enable aux device */

#define AUX_DISABLE_DEV		0xF5	/* Disable aux device */

#define AUX_SET_DEFAULT		0xF6

#define AUX_RESET		0xFF	/* Reset aux device */

#define AUX_ACK			0xFA	/* Command byte ACK. */

#define MOUSE_STATUS_REMOTE     0x40

#define MOUSE_STATUS_ENABLED    0x20

#define MOUSE_STATUS_SCALE21    0x10

#define PS2_QUEUE_SIZE 256

typedef struct {

    uint8_t data[PS2_QUEUE_SIZE];

    int rptr, wptr, count;

} PS2Queue;

typedef struct {

    PS2Queue queue;

    int32_t write_cmd;

    void (*update_irq)(void *, int);

    void *update_arg;

} PS2State;

typedef struct {

    PS2State common;

    int scan_enabled;

    /* Qemu uses translated PC scancodes internally.  To avoid multiple

       conversions we do the translation (if any) in the PS/2 emulation

       not the keyboard controller.  */

    int translate;

    int scancode_set; /* 1=XT, 2=AT, 3=PS/2 */

} PS2KbdState;

typedef struct {

    PS2State common;

    uint8_t mouse_status;

    uint8_t mouse_resolution;

    uint8_t mouse_sample_rate;

    uint8_t mouse_wrap;

    uint8_t mouse_type; /* 0 = PS2, 3 = IMPS/2, 4 = IMEX */

    uint8_t mouse_detect_state;

    int mouse_dx; /* current values, needed for 'poll' mode */

    int mouse_dy;

    int mouse_dz;

    uint8_t mouse_buttons;

} PS2MouseState;

/* Table to convert from PC scancodes to raw scancodes.  */

static const unsigned char ps2_raw_keycode[128] = {

          0,118, 22, 30, 38, 37, 46, 54, 61, 62, 70, 69, 78, 85,102, 13,

         21, 29, 36, 45, 44, 53, 60, 67, 68, 77, 84, 91, 90, 20, 28, 27,

         35, 43, 52, 51, 59, 66, 75, 76, 82, 14, 18, 93, 26, 34, 33, 42,

         50, 49, 58, 65, 73, 74, 89,124, 17, 41, 88,  5,  6,  4, 12,  3,

         11,  2, 10,  1,  9,119,126,108,117,125,123,107,115,116,121,105,

        114,122,112,113,127, 96, 97,120,  7, 15, 23, 31, 39, 47, 55, 63,

         71, 79, 86, 94,  8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 87,111,

         19, 25, 57, 81, 83, 92, 95, 98, 99,100,101,103,104,106,109,110

};

void ps2_queue(void *opaque, int b)

{

    PS2State *s = (PS2State *)opaque;

    PS2Queue *q = &s->queue;

    if (q->count >= PS2_QUEUE_SIZE)

        return;

    q->data[q->wptr] = b;

    if (++q->wptr == PS2_QUEUE_SIZE)

        q->wptr = 0;

    q->count++;

    s->update_irq(s->update_arg, 1);

}

/*

   keycode is expressed as follow:

   bit 7    - 0 key pressed, 1 = key released

   bits 6-0 - translated scancode set 2

 */

static void ps2_put_keycode(void *opaque, int keycode)

{

    PS2KbdState *s = opaque;

    /* XXX: add support for scancode sets 1 and 3 */

    if (!s->translate && keycode < 0xe0 && s->scancode_set == 2)

      {

        if (keycode & 0x80)

            ps2_queue(&s->common, 0xf0);

        keycode = ps2_raw_keycode[keycode & 0x7f];

      }

    ps2_queue(&s->common, keycode);

}

uint32_t ps2_read_data(void *opaque)

{

    PS2State *s = (PS2State *)opaque;

    PS2Queue *q;

    int val, index;

    q = &s->queue;

    if (q->count == 0) {

        /* NOTE: if no data left, we return the last keyboard one

           (needed for EMM386) */

        /* XXX: need a timer to do things correctly */

        index = q->rptr - 1;

        if (index < 0)

            index = PS2_QUEUE_SIZE - 1;

        val = q->data[index];

    } else {

        val = q->data[q->rptr];

        if (++q->rptr == PS2_QUEUE_SIZE)

            q->rptr = 0;

        q->count--;

        /* reading deasserts IRQ */

        s->update_irq(s->update_arg, 0);

        /* reassert IRQs if data left */

        s->update_irq(s->update_arg, q->count != 0);

    }

    return val;

}

static void ps2_reset_keyboard(PS2KbdState *s)

{

    s->scan_enabled = 1;

    s->scancode_set = 2;

}

void ps2_write_keyboard(void *opaque, int val)

{

    PS2KbdState *s = (PS2KbdState *)opaque;

    switch(s->common.write_cmd) {

    default:

    case -1:

        switch(val) {

        case 0x00:

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        case 0x05:

            ps2_queue(&s->common, KBD_REPLY_RESEND);

            break;

        case KBD_CMD_GET_ID:

            ps2_queue(&s->common, KBD_REPLY_ACK);

            /* We emulate a MF2 AT keyboard here */

            ps2_queue(&s->common, KBD_REPLY_ID);

            if (s->translate)

                ps2_queue(&s->common, 0x41);

            else

                ps2_queue(&s->common, 0x83);

            break;

        case KBD_CMD_ECHO:

            ps2_queue(&s->common, KBD_CMD_ECHO);

            break;

        case KBD_CMD_ENABLE:

            s->scan_enabled = 1;

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        case KBD_CMD_SCANCODE:

        case KBD_CMD_SET_LEDS:

        case KBD_CMD_SET_RATE:

            s->common.write_cmd = val;

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        case KBD_CMD_RESET_DISABLE:

            ps2_reset_keyboard(s);

            s->scan_enabled = 0;

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        case KBD_CMD_RESET_ENABLE:

            ps2_reset_keyboard(s);

            s->scan_enabled = 1;

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        case KBD_CMD_RESET:

            ps2_reset_keyboard(s);

            ps2_queue(&s->common, KBD_REPLY_ACK);

            ps2_queue(&s->common, KBD_REPLY_POR);

            break;

        default:

            ps2_queue(&s->common, KBD_REPLY_ACK);

            break;

        }

        break;

    case KBD_CMD_SCANCODE:

        if (val == 0) {

            if (s->scancode_set == 1)

                ps2_put_keycode(s, 0x43);

            else if (s->scancode_set == 2)

                ps2_put_keycode(s, 0x41);

            else if (s->scancode_set == 3)

                ps2_put_keycode(s, 0x3f);

        } else {

            if (val >= 1 && val <= 3)

                s->scancode_set = val;

            ps2_queue(&s->common, KBD_REPLY_ACK);

        }

        s->common.write_cmd = -1;

        break;

    case KBD_CMD_SET_LEDS:

        ps2_queue(&s->common, KBD_REPLY_ACK);

        s->common.write_cmd = -1;

        break;

    case KBD_CMD_SET_RATE:

        ps2_queue(&s->common, KBD_REPLY_ACK);

        s->common.write_cmd = -1;

        break;

    }

}

/* Set the scancode translation mode.

   0 = raw scancodes.

   1 = translated scancodes (used by qemu internally).  */

void ps2_keyboard_set_translation(void *opaque, int mode)

{

    PS2KbdState *s = (PS2KbdState *)opaque;

    s->translate = mode;

}

static void ps2_mouse_send_packet(PS2MouseState *s)

{

    unsigned int b;

    int dx1, dy1, dz1;

    dx1 = s->mouse_dx;

    dy1 = s->mouse_dy;

    dz1 = s->mouse_dz;

    /* XXX: increase range to 8 bits ? */

    if (dx1 > 127)

        dx1 = 127;

    else if (dx1 < -127)

        dx1 = -127;

    if (dy1 > 127)

        dy1 = 127;

    else if (dy1 < -127)

        dy1 = -127;

    b = 0x08 | ((dx1 < 0) << 4) | ((dy1 < 0) << 5) | (s->mouse_buttons & 0x07);

    ps2_queue(&s->common, b);

    ps2_queue(&s->common, dx1 & 0xff);

    ps2_queue(&s->common, dy1 & 0xff);

    /* extra byte for IMPS/2 or IMEX */

    switch(s->mouse_type) {

    default:

        break;

    case 3:

        if (dz1 > 127)

            dz1 = 127;

        else if (dz1 < -127)

                dz1 = -127;

        ps2_queue(&s->common, dz1 & 0xff);

        break;

    case 4:

        if (dz1 > 7)

            dz1 = 7;

        else if (dz1 < -7)

            dz1 = -7;

        b = (dz1 & 0x0f) | ((s->mouse_buttons & 0x18) << 1);

        ps2_queue(&s->common, b);

        break;

    }

    /* update deltas */

    s->mouse_dx -= dx1;

    s->mouse_dy -= dy1;

    s->mouse_dz -= dz1;

}

static void ps2_mouse_event(void *opaque,

                            int dx, int dy, int dz, int buttons_state)

{

    PS2MouseState *s = opaque;

    /* check if deltas are recorded when disabled */

    if (!(s->mouse_status & MOUSE_STATUS_ENABLED))

        return;

    s->mouse_dx += dx;

    s->mouse_dy -= dy;

    s->mouse_dz += dz;

    /* XXX: SDL sometimes generates nul events: we delete them */

    if (s->mouse_dx == 0 && s->mouse_dy == 0 && s->mouse_dz == 0 &&

        s->mouse_buttons == buttons_state)

	return;

    s->mouse_buttons = buttons_state;

    if (!(s->mouse_status & MOUSE_STATUS_REMOTE) &&

        (s->common.queue.count < (PS2_QUEUE_SIZE - 16))) {

        for(;;) {

            /* if not remote, send event. Multiple events are sent if

               too big deltas */

            ps2_mouse_send_packet(s);

            if (s->mouse_dx == 0 && s->mouse_dy == 0 && s->mouse_dz == 0)

                break;

        }

    }

}

void ps2_mouse_fake_event(void *opaque)

{

    ps2_mouse_event(opaque, 1, 0, 0, 0);

}

void ps2_write_mouse(void *opaque, int val)

{

    PS2MouseState *s = (PS2MouseState *)opaque;

#ifdef DEBUG_MOUSE

    printf("kbd: write mouse 0x%02x\n", val);

#endif

    switch(s->common.write_cmd) {

    default:

    case -1:

        /* mouse command */

        if (s->mouse_wrap) {

            if (val == AUX_RESET_WRAP) {

                s->mouse_wrap = 0;

                ps2_queue(&s->common, AUX_ACK);

                return;

            } else if (val != AUX_RESET) {

                ps2_queue(&s->common, val);

                return;

            }

        }

        switch(val) {

        case AUX_SET_SCALE11:

            s->mouse_status &= ~MOUSE_STATUS_SCALE21;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_SET_SCALE21:

            s->mouse_status |= MOUSE_STATUS_SCALE21;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_SET_STREAM:

            s->mouse_status &= ~MOUSE_STATUS_REMOTE;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_SET_WRAP:

            s->mouse_wrap = 1;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_SET_REMOTE:

            s->mouse_status |= MOUSE_STATUS_REMOTE;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_GET_TYPE:

            ps2_queue(&s->common, AUX_ACK);

            ps2_queue(&s->common, s->mouse_type);

            break;

        case AUX_SET_RES:

        case AUX_SET_SAMPLE:

            s->common.write_cmd = val;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_GET_SCALE:

            ps2_queue(&s->common, AUX_ACK);

            ps2_queue(&s->common, s->mouse_status);

            ps2_queue(&s->common, s->mouse_resolution);

            ps2_queue(&s->common, s->mouse_sample_rate);

            break;

        case AUX_POLL:

            ps2_queue(&s->common, AUX_ACK);

            ps2_mouse_send_packet(s);

            break;

        case AUX_ENABLE_DEV:

            s->mouse_status |= MOUSE_STATUS_ENABLED;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_DISABLE_DEV:

            s->mouse_status &= ~MOUSE_STATUS_ENABLED;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_SET_DEFAULT:

            s->mouse_sample_rate = 100;

            s->mouse_resolution = 2;

            s->mouse_status = 0;

            ps2_queue(&s->common, AUX_ACK);

            break;

        case AUX_RESET:

            s->mouse_sample_rate = 100;

            s->mouse_resolution = 2;

            s->mouse_status = 0;

            s->mouse_type = 0;

            ps2_queue(&s->common, AUX_ACK);

            ps2_queue(&s->common, 0xaa);

            ps2_queue(&s->common, s->mouse_type);

            break;

        default:

            break;

        }

        break;

    case AUX_SET_SAMPLE:

        s->mouse_sample_rate = val;

        /* detect IMPS/2 or IMEX */

        switch(s->mouse_detect_state) {

        default:

        case 0:

            if (val == 200)

                s->mouse_detect_state = 1;

            break;

        case 1:

            if (val == 100)

                s->mouse_detect_state = 2;

            else if (val == 200)

                s->mouse_detect_state = 3;

            else

                s->mouse_detect_state = 0;

            break;

        case 2:

            if (val == 80)

                s->mouse_type = 3; /* IMPS/2 */

            s->mouse_detect_state = 0;

            break;

        case 3:

            if (val == 80)

                s->mouse_type = 4; /* IMEX */

            s->mouse_detect_state = 0;

            break;

        }

        ps2_queue(&s->common, AUX_ACK);

        s->common.write_cmd = -1;

        break;

    case AUX_SET_RES:

        s->mouse_resolution = val;

        ps2_queue(&s->common, AUX_ACK);

        s->common.write_cmd = -1;

        break;

    }

}

static void ps2_reset(void *opaque)

{

    PS2State *s = (PS2State *)opaque;

    PS2Queue *q;

    s->write_cmd = -1;

    q = &s->queue;

    q->rptr = 0;

    q->wptr = 0;

    q->count = 0;

}

static void ps2_common_save (QEMUFile *f, PS2State *s)

{

    qemu_put_be32 (f, s->write_cmd);

    qemu_put_be32 (f, s->queue.rptr);

    qemu_put_be32 (f, s->queue.wptr);

    qemu_put_be32 (f, s->queue.count);

    qemu_put_buffer (f, s->queue.data, sizeof (s->queue.data));

}

static void ps2_common_load (QEMUFile *f, PS2State *s)

{

    s->write_cmd=qemu_get_be32 (f);

    s->queue.rptr=qemu_get_be32 (f);

    s->queue.wptr=qemu_get_be32 (f);

    s->queue.count=qemu_get_be32 (f);

    qemu_get_buffer (f, s->queue.data, sizeof (s->queue.data));

}

static void ps2_kbd_save(QEMUFile* f, void* opaque)

{

    PS2KbdState *s = (PS2KbdState*)opaque;

    ps2_common_save (f, &s->common);

    qemu_put_be32(f, s->scan_enabled);

    qemu_put_be32(f, s->translate);

    qemu_put_be32(f, s->scancode_set);

}