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/*

 * QEMU PC APM controller Emulation

 * This is split out from acpi.c

 *

 * Copyright (c) 2006 Fabrice Bellard

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License version 2 as published by the Free Software Foundation.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>

 *

 * 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/isa/apm.h"

#include "hw/hw.h"

#include "hw/pci/pci.h"

//#define DEBUG

#ifdef DEBUG

# define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)

#else

# define APM_DPRINTF(format, ...)       do { } while (0)

#endif

/* fixed I/O location */

#define APM_CNT_IOPORT  0xb2

#define APM_STS_IOPORT  0xb3

static void apm_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,

                              unsigned size)

{

    APMState *apm = opaque;

    addr &= 1;

    APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);

    if (addr == 0) {

        apm->apmc = val;

        if (apm->callback) {

            (apm->callback)(val, apm->arg);

        }

    } else {

        apm->apms = val;

    }

}

static uint64_t apm_ioport_readb(void *opaque, hwaddr addr, unsigned size)

{

    APMState *apm = opaque;

    uint32_t val;

    addr &= 1;

    if (addr == 0) {

        val = apm->apmc;

    } else {

        val = apm->apms;

    }

    APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);

    return val;

}

const VMStateDescription vmstate_apm = {

    .name = "APM State",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields = (VMStateField[]) {

        VMSTATE_UINT8(apmc, APMState),

        VMSTATE_UINT8(apms, APMState),

        VMSTATE_END_OF_LIST()

    }

};

static const MemoryRegionOps apm_ops = {

    .read = apm_ioport_readb,

    .write = apm_ioport_writeb,

    .impl = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

void apm_init(PCIDevice *dev, APMState *apm, apm_ctrl_changed_t callback,

              void *arg)

{

    apm->callback = callback;

    apm->arg = arg;

    /* ioport 0xb2, 0xb3 */

    memory_region_init_io(&apm->io, OBJECT(dev), &apm_ops, apm, "apm-io", 2);

    memory_region_add_subregion(pci_address_space_io(dev), APM_CNT_IOPORT,

                                &apm->io);

}