Archipelago » qemu

/*

 * Syborg pointing device (mouse/touchscreen)

 *

 * Copyright (c) 2008 CodeSourcery

 *

 * 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 "sysbus.h"

#include "console.h"

#include "syborg.h"

enum {

    POINTER_ID          = 0,

    POINTER_LATCH       = 1,

    POINTER_FIFO_COUNT  = 2,

    POINTER_X           = 3,

    POINTER_Y           = 4,

    POINTER_Z           = 5,

    POINTER_BUTTONS     = 6,

    POINTER_INT_ENABLE  = 7,

    POINTER_FIFO_SIZE   = 8

};

typedef struct {

    int x, y, z, pointer_buttons;

} event_data;

typedef struct {

    SysBusDevice busdev;

    int int_enabled;

    int fifo_size;

    event_data *event_fifo;

    int read_pos, read_count;

    qemu_irq irq;

    int absolute;

} SyborgPointerState;

static void syborg_pointer_update(SyborgPointerState *s)

{

    qemu_set_irq(s->irq, s->read_count && s->int_enabled);

}

static uint32_t syborg_pointer_read(void *opaque, target_phys_addr_t offset)

{

    SyborgPointerState *s = (SyborgPointerState *)opaque;

    offset &= 0xfff;

    switch (offset >> 2) {

    case POINTER_ID:

        return s->absolute ? SYBORG_ID_TOUCHSCREEN : SYBORG_ID_MOUSE;

    case POINTER_FIFO_COUNT:

        return s->read_count;

    case POINTER_X:

        return s->event_fifo[s->read_pos].x;

    case POINTER_Y:

        return s->event_fifo[s->read_pos].y;

    case POINTER_Z:

        return s->event_fifo[s->read_pos].z;

    case POINTER_BUTTONS:

        return s->event_fifo[s->read_pos].pointer_buttons;

    case POINTER_INT_ENABLE:

        return s->int_enabled;

    case POINTER_FIFO_SIZE:

        return s->fifo_size;

    default:

        cpu_abort(cpu_single_env, "syborg_pointer_read: Bad offset %x\n",

                  (int)offset);

        return 0;

    }

}

static void syborg_pointer_write(void *opaque, target_phys_addr_t offset,

                                 uint32_t value)

{

    SyborgPointerState *s = (SyborgPointerState *)opaque;

    offset &= 0xfff;

    switch (offset >> 2) {

    case POINTER_LATCH:

        if (s->read_count > 0) {

            s->read_count--;

            if (++s->read_pos == s->fifo_size)

                s->read_pos = 0;

        }

        break;

    case POINTER_INT_ENABLE:

        s->int_enabled = value;

        break;

    default:

        cpu_abort(cpu_single_env, "syborg_pointer_write: Bad offset %x\n",

                  (int)offset);

    }

    syborg_pointer_update(s);

}

static CPUReadMemoryFunc *syborg_pointer_readfn[] = {

   syborg_pointer_read,

   syborg_pointer_read,

   syborg_pointer_read

};

static CPUWriteMemoryFunc *syborg_pointer_writefn[] = {

   syborg_pointer_write,

   syborg_pointer_write,

   syborg_pointer_write

};

static void syborg_pointer_event(void *opaque, int dx, int dy, int dz,

                                 int buttons_state)

{

    SyborgPointerState *s = (SyborgPointerState *)opaque;

    int slot = s->read_pos + s->read_count;

    /* This first FIFO entry is used to store current register state.  */

    if (s->read_count < s->fifo_size - 1) {

        s->read_count++;

        slot++;

    }

    if (slot >= s->fifo_size)

          slot -= s->fifo_size;

    if (s->read_count == s->fifo_size && !s->absolute) {

        /* Merge existing entries.  */

        s->event_fifo[slot].x += dx;

        s->event_fifo[slot].y += dy;

        s->event_fifo[slot].z += dz;

    } else {

        s->event_fifo[slot].x = dx;

        s->event_fifo[slot].y = dy;

        s->event_fifo[slot].z = dz;

    }

    s->event_fifo[slot].pointer_buttons = buttons_state;

    syborg_pointer_update(s);

}

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

{

    SyborgPointerState *s = (SyborgPointerState *)opaque;

    int i;

    qemu_put_be32(f, s->fifo_size);

    qemu_put_be32(f, s->absolute);

    qemu_put_be32(f, s->int_enabled);

    qemu_put_be32(f, s->read_pos);

    qemu_put_be32(f, s->read_count);

    for (i = 0; i < s->fifo_size; i++) {

        qemu_put_be32(f, s->event_fifo[i].x);

        qemu_put_be32(f, s->event_fifo[i].y);

        qemu_put_be32(f, s->event_fifo[i].z);

        qemu_put_be32(f, s->event_fifo[i].pointer_buttons);

    }

}

static int syborg_pointer_load(QEMUFile *f, void *opaque, int version_id)

{

    SyborgPointerState *s = (SyborgPointerState *)opaque;

    uint32_t val;

    int i;

    if (version_id != 1)

        return -EINVAL;

    val = qemu_get_be32(f);

    if (val != s->fifo_size)

        return -EINVAL;

    val = qemu_get_be32(f);

    if (val != s->absolute)

        return -EINVAL;

    s->int_enabled = qemu_get_be32(f);

    s->read_pos = qemu_get_be32(f);

    s->read_count = qemu_get_be32(f);

    for (i = 0; i < s->fifo_size; i++) {

        s->event_fifo[i].x = qemu_get_be32(f);

        s->event_fifo[i].y = qemu_get_be32(f);

        s->event_fifo[i].z = qemu_get_be32(f);

        s->event_fifo[i].pointer_buttons = qemu_get_be32(f);

    }

    return 0;

}

static void syborg_pointer_init(SysBusDevice *dev)

{

    SyborgPointerState *s = FROM_SYSBUS(SyborgPointerState, dev);

    int iomemtype;

    sysbus_init_irq(dev, &s->irq);

    iomemtype = cpu_register_io_memory(0, syborg_pointer_readfn,

                                       syborg_pointer_writefn, s);

    sysbus_init_mmio(dev, 0x1000, iomemtype);

    s->absolute = qdev_get_prop_int(&dev->qdev, "absolute", 1);

    s->fifo_size = qdev_get_prop_int(&dev->qdev, "fifo-size", 16);

    if (s->fifo_size <= 0) {

        fprintf(stderr, "syborg_pointer: fifo too small\n");

        s->fifo_size = 16;

    }

    s->event_fifo = qemu_mallocz(s->fifo_size * sizeof(s->event_fifo[0]));

    qemu_add_mouse_event_handler(syborg_pointer_event, s, s->absolute,

                                 "Syborg Pointer");

    register_savevm("syborg_pointer", -1, 1,

                    syborg_pointer_save, syborg_pointer_load, s);

}

static void syborg_pointer_register_devices(void)

{

    sysbus_register_dev("syborg,pointer", sizeof(SyborgPointerState),

                        syborg_pointer_init);

}

device_init(syborg_pointer_register_devices)