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/*

 * Intel PXA27X Keypad Controller emulation.

 *

 * Copyright (c) 2007 MontaVista Software, Inc

 * Written by Armin Kuster <akuster@kama-aina.net>

 *              or  <Akuster@mvista.com>

 *

 * This code is licensed under the GPLv2.

 *

 * Contributions after 2012-01-13 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "hw/hw.h"

#include "hw/arm/pxa.h"

#include "ui/console.h"

/*

 * Keypad

 */

#define KPC         0x00    /* Keypad Interface Control register */

#define KPDK        0x08    /* Keypad Interface Direct Key register */

#define KPREC       0x10    /* Keypad Interface Rotary Encoder register */

#define KPMK        0x18    /* Keypad Interface Matrix Key register */

#define KPAS        0x20    /* Keypad Interface Automatic Scan register */

#define KPASMKP0    0x28    /* Keypad Interface Automatic Scan Multiple

                                Key Presser register 0 */

#define KPASMKP1    0x30    /* Keypad Interface Automatic Scan Multiple

                                Key Presser register 1 */

#define KPASMKP2    0x38    /* Keypad Interface Automatic Scan Multiple

                                Key Presser register 2 */

#define KPASMKP3    0x40    /* Keypad Interface Automatic Scan Multiple

                                Key Presser register 3 */

#define KPKDI       0x48    /* Keypad Interface Key Debounce Interval

                                register */

/* Keypad defines */

#define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */

#define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */

#define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */

#define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */

#define KPC_MS7         (0x1 << 20)  /* Matrix scan line 7 */

#define KPC_MS6         (0x1 << 19)  /* Matrix scan line 6 */

#define KPC_MS5         (0x1 << 18)  /* Matrix scan line 5 */

#define KPC_MS4         (0x1 << 17)  /* Matrix scan line 4 */

#define KPC_MS3         (0x1 << 16)  /* Matrix scan line 3 */

#define KPC_MS2         (0x1 << 15)  /* Matrix scan line 2 */

#define KPC_MS1         (0x1 << 14)  /* Matrix scan line 1 */

#define KPC_MS0         (0x1 << 13)  /* Matrix scan line 0 */

#define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */

#define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */

#define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */

#define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */

#define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */

#define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */

#define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */

#define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */

#define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */

#define KPDK_DKP        (0x1 << 31)

#define KPDK_DK7        (0x1 <<  7)

#define KPDK_DK6        (0x1 <<  6)

#define KPDK_DK5        (0x1 <<  5)

#define KPDK_DK4        (0x1 <<  4)

#define KPDK_DK3        (0x1 <<  3)

#define KPDK_DK2        (0x1 <<  2)

#define KPDK_DK1        (0x1 <<  1)

#define KPDK_DK0        (0x1 <<  0)

#define KPREC_OF1       (0x1 << 31)

#define KPREC_UF1       (0x1 << 30)

#define KPREC_OF0       (0x1 << 15)

#define KPREC_UF0       (0x1 << 14)

#define KPMK_MKP        (0x1 << 31)

#define KPAS_SO         (0x1 << 31)

#define KPASMKPx_SO     (0x1 << 31)

#define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))

#define PXAKBD_MAXROW   8

#define PXAKBD_MAXCOL   8

struct PXA2xxKeyPadState {

    MemoryRegion iomem;

    qemu_irq    irq;

    struct  keymap *map;

    int         pressed_cnt;

    int         alt_code;

    uint32_t    kpc;

    uint32_t    kpdk;

    uint32_t    kprec;

    uint32_t    kpmk;

    uint32_t    kpas;

    uint32_t    kpasmkp[4];

    uint32_t    kpkdi;

};

static void pxa27x_keypad_find_pressed_key(PXA2xxKeyPadState *kp, int *row, int *col)

{

    int i;

    for (i = 0; i < 4; i++)

    {

        *col = i * 2;

        for (*row = 0; *row < 8; (*row)++) {

            if (kp->kpasmkp[i] & (1 << *row))

                return;

        }

        *col = i * 2 + 1;

        for (*row = 0; *row < 8; (*row)++) {

            if (kp->kpasmkp[i] & (1 << (*row + 16)))

                return;

        }

    }

}

static void pxa27x_keyboard_event (PXA2xxKeyPadState *kp, int keycode)

{

    int row, col, rel, assert_irq = 0;

    uint32_t val;

    if (keycode == 0xe0) {

        kp->alt_code = 1;

        return;

    }

    if(!(kp->kpc & KPC_ME)) /* skip if not enabled */

        return;

    rel = (keycode & 0x80) ? 1 : 0; /* key release from qemu */

    keycode &= ~0x80; /* strip qemu key release bit */

    if (kp->alt_code) {

        keycode |= 0x80;

        kp->alt_code = 0;

    }

    row = kp->map[keycode].row;

    col = kp->map[keycode].column;

    if (row == -1 || col == -1) {

        return;

    }

    val = KPASMKPx_MKC(row, col);

    if (rel) {

        if (kp->kpasmkp[col / 2] & val) {

            kp->kpasmkp[col / 2] &= ~val;

            kp->pressed_cnt--;

            assert_irq = 1;

        }

    } else {

        if (!(kp->kpasmkp[col / 2] & val)) {

            kp->kpasmkp[col / 2] |= val;

            kp->pressed_cnt++;

            assert_irq = 1;

        }

    }

    kp->kpas = ((kp->pressed_cnt & 0x1f) << 26) | (0xf << 4) | 0xf;

    if (kp->pressed_cnt == 1) {

        kp->kpas &= ~((0xf << 4) | 0xf);

        if (rel) {

            pxa27x_keypad_find_pressed_key(kp, &row, &col);

        }

        kp->kpas |= ((row & 0xf) << 4) | (col & 0xf);

    }

    if (!(kp->kpc & (KPC_AS | KPC_ASACT)))

        assert_irq = 0;

    if (assert_irq && (kp->kpc & KPC_MIE)) {

        kp->kpc |= KPC_MI;

        qemu_irq_raise(kp->irq);

    }

}

static uint64_t pxa2xx_keypad_read(void *opaque, hwaddr offset,

                                   unsigned size)

{

    PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;

    uint32_t tmp;

    switch (offset) {

    case KPC:

        tmp = s->kpc;

        if(tmp & KPC_MI)

            s->kpc &= ~(KPC_MI);

        if(tmp & KPC_DI)

            s->kpc &= ~(KPC_DI);

        qemu_irq_lower(s->irq);

        return tmp;

        break;

    case KPDK:

        return s->kpdk;

        break;

    case KPREC:

        tmp = s->kprec;

        if(tmp & KPREC_OF1)

            s->kprec &= ~(KPREC_OF1);

        if(tmp & KPREC_UF1)

            s->kprec &= ~(KPREC_UF1);

        if(tmp & KPREC_OF0)

            s->kprec &= ~(KPREC_OF0);

        if(tmp & KPREC_UF0)

            s->kprec &= ~(KPREC_UF0);

        return tmp;

        break;

    case KPMK:

        tmp = s->kpmk;

        if(tmp & KPMK_MKP)

            s->kpmk &= ~(KPMK_MKP);

        return tmp;

        break;

    case KPAS:

        return s->kpas;

        break;

    case KPASMKP0:

        return s->kpasmkp[0];

        break;

    case KPASMKP1:

        return s->kpasmkp[1];

        break;

    case KPASMKP2:

        return s->kpasmkp[2];

        break;

    case KPASMKP3:

        return s->kpasmkp[3];

        break;

    case KPKDI:

        return s->kpkdi;

        break;

    default:

        hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);

    }

    return 0;

}

static void pxa2xx_keypad_write(void *opaque, hwaddr offset,

                                uint64_t value, unsigned size)

{

    PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;

    switch (offset) {

    case KPC:

        s->kpc = value;

        if (s->kpc & KPC_AS) {

            s->kpc &= ~(KPC_AS);

        }

        break;

    case KPDK:

        s->kpdk = value;

        break;

    case KPREC:

        s->kprec = value;

        break;

    case KPMK:

        s->kpmk = value;

        break;

    case KPAS:

        s->kpas = value;

        break;

    case KPASMKP0:

        s->kpasmkp[0] = value;

        break;

    case KPASMKP1:

        s->kpasmkp[1] = value;

        break;

    case KPASMKP2:

        s->kpasmkp[2] = value;

        break;

    case KPASMKP3:

        s->kpasmkp[3] = value;

        break;

    case KPKDI:

        s->kpkdi = value;

        break;

    default:

        hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);

    }

}

static const MemoryRegionOps pxa2xx_keypad_ops = {

    .read = pxa2xx_keypad_read,

    .write = pxa2xx_keypad_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static const VMStateDescription vmstate_pxa2xx_keypad = {

    .name = "pxa2xx_keypad",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32(kpc, PXA2xxKeyPadState),

        VMSTATE_UINT32(kpdk, PXA2xxKeyPadState),

        VMSTATE_UINT32(kprec, PXA2xxKeyPadState),

        VMSTATE_UINT32(kpmk, PXA2xxKeyPadState),

        VMSTATE_UINT32(kpas, PXA2xxKeyPadState),

        VMSTATE_UINT32_ARRAY(kpasmkp, PXA2xxKeyPadState, 4),

        VMSTATE_UINT32(kpkdi, PXA2xxKeyPadState),

        VMSTATE_END_OF_LIST()

    }

};

PXA2xxKeyPadState *pxa27x_keypad_init(MemoryRegion *sysmem,

                                      hwaddr base,

                                      qemu_irq irq)

{

    PXA2xxKeyPadState *s;

    s = (PXA2xxKeyPadState *) g_malloc0(sizeof(PXA2xxKeyPadState));

    s->irq = irq;

    memory_region_init_io(&s->iomem, &pxa2xx_keypad_ops, s,

                          "pxa2xx-keypad", 0x00100000);

    memory_region_add_subregion(sysmem, base, &s->iomem);

    vmstate_register(NULL, 0, &vmstate_pxa2xx_keypad, s);

    return s;

}

void pxa27x_register_keypad(PXA2xxKeyPadState *kp, struct keymap *map,

        int size)

{

    if(!map || size < 0x80) {

        fprintf(stderr, "%s - No PXA keypad map defined\n", __FUNCTION__);

        exit(-1);

    }

    kp->map = map;

    qemu_add_kbd_event_handler((QEMUPutKBDEvent *) pxa27x_keyboard_event, kp);

}