/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>
#include <acpi/acpi_bus.h>

#include "../base.h"
#include "pnpacpi.h"

static int num;

/* We need only to blacklist devices that have already an acpi driver that
 * can't use pnp layer. We don't need to blacklist device that are directly
 * used by the kernel (PCI root, ...), as it is harmless and there were
 * already present in pnpbios. But there is an exception for devices that
 * have irqs (PIC, Timer) because we call acpi_register_gsi.
 * Finally, only devices that have a CRS method need to be in this list.
 */
static struct acpi_device_id excluded_id_list[] __initdata = {
        {"PNP0C09", 0},         /* EC */
        {"PNP0C0F", 0},         /* Link device */
        {"PNP0000", 0},         /* PIC */
        {"PNP0100", 0},         /* Timer */
        {"", 0},
};

static inline int __init is_exclusive_device(struct acpi_device *dev)
{
        return (!acpi_match_device_ids(dev, excluded_id_list));
}

/*
 * Compatible Device IDs
 */
#define TEST_HEX(c) \
        if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
                return 0
#define TEST_ALPHA(c) \
        if (!('A' <= (c) && (c) <= 'Z')) \
                return 0
static int __init ispnpidacpi(const char *id)
{
        TEST_ALPHA(id[0]);
        TEST_ALPHA(id[1]);
        TEST_ALPHA(id[2]);
        TEST_HEX(id[3]);
        TEST_HEX(id[4]);
        TEST_HEX(id[5]);
        TEST_HEX(id[6]);
        if (id[7] != '\0')
                return 0;
        return 1;
}

static int pnpacpi_get_resources(struct pnp_dev *dev)
{
        pnp_dbg(&dev->dev, "get resources\n");
        return pnpacpi_parse_allocated_resource(dev);
}

static int pnpacpi_set_resources(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev;
        acpi_handle handle;
        struct acpi_buffer buffer;
        int ret;

        pnp_dbg(&dev->dev, "set resources\n");

        handle = DEVICE_ACPI_HANDLE(&dev->dev);
        if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
                return -ENODEV;
        }

        if (WARN_ON_ONCE(acpi_dev != dev->data))
                dev->data = acpi_dev;

        ret = pnpacpi_build_resource_template(dev, &buffer);
        if (ret)
                return ret;
        ret = pnpacpi_encode_resources(dev, &buffer);
        if (ret) {
                kfree(buffer.pointer);
                return ret;
        }
        if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
                ret = -EINVAL;
        else if (acpi_bus_power_manageable(handle))
                ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
        kfree(buffer.pointer);
        return ret;
}

static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev;
        acpi_handle handle;
        int ret;

        dev_dbg(&dev->dev, "disable resources\n");

        handle = DEVICE_ACPI_HANDLE(&dev->dev);
        if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
                return 0;
        }

        /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
        ret = 0;
        if (acpi_bus_power_manageable(handle))
                acpi_bus_set_power(handle, ACPI_STATE_D3);
                /* continue even if acpi_bus_set_power() fails */
        if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
                ret = -ENODEV;
        return ret;
}

#ifdef CONFIG_ACPI_SLEEP
static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev;
        acpi_handle handle;

        handle = DEVICE_ACPI_HANDLE(&dev->dev);
        if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
                return false;
        }

        return acpi_bus_can_wakeup(handle);
}

static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
        struct acpi_device *acpi_dev;
        acpi_handle handle;
        int error = 0;

        handle = DEVICE_ACPI_HANDLE(&dev->dev);
        if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
                return 0;
        }

        if (device_can_wakeup(&dev->dev)) {
                error = acpi_pm_device_sleep_wake(&dev->dev,
                                device_may_wakeup(&dev->dev));
                if (error)
                        return error;
        }

        if (acpi_bus_power_manageable(handle)) {
                int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
                                                             ACPI_STATE_D3);
                if (power_state < 0)
                        power_state = (state.event == PM_EVENT_ON) ?
                                        ACPI_STATE_D0 : ACPI_STATE_D3;

                /*
                 * acpi_bus_set_power() often fails (keyboard port can't be
                 * powered-down?), and in any case, our return value is ignored
                 * by pnp_bus_suspend().  Hence we don't revert the wakeup
                 * setting if the set_power fails.
                 */
                error = acpi_bus_set_power(handle, power_state);
        }

        return error;
}

static int pnpacpi_resume(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev;
        acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
        int error = 0;

        if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
                return -ENODEV;
        }

        if (device_may_wakeup(&dev->dev))
                acpi_pm_device_sleep_wake(&dev->dev, false);

        if (acpi_bus_power_manageable(handle))
                error = acpi_bus_set_power(handle, ACPI_STATE_D0);

        return error;
}
#endif

struct pnp_protocol pnpacpi_protocol = {
        .name    = "Plug and Play ACPI",
        .get     = pnpacpi_get_resources,
        .set     = pnpacpi_set_resources,
        .disable = pnpacpi_disable_resources,
#ifdef CONFIG_ACPI_SLEEP
        .can_wakeup = pnpacpi_can_wakeup,
        .suspend = pnpacpi_suspend,
        .resume = pnpacpi_resume,
#endif
};
EXPORT_SYMBOL(pnpacpi_protocol);

static char *__init pnpacpi_get_id(struct acpi_device *device)
{
        struct acpi_hardware_id *id;

        list_for_each_entry(id, &device->pnp.ids, list) {
                if (ispnpidacpi(id->id))
                        return id->id;
        }

        return NULL;
}

static int __init pnpacpi_add_device(struct acpi_device *device)
{
        acpi_handle temp = NULL;
        acpi_status status;
        struct pnp_dev *dev;
        char *pnpid;
        struct acpi_hardware_id *id;

        /* Skip devices that are already bound */
        if (device->physical_node_count)
                return 0;

        /*
         * If a PnPacpi device is not present , the device
         * driver should not be loaded.
         */
        status = acpi_get_handle(device->handle, "_CRS", &temp);
        if (ACPI_FAILURE(status))
                return 0;

        pnpid = pnpacpi_get_id(device);
        if (!pnpid)
                return 0;

        if (is_exclusive_device(device) || !device->status.present)
                return 0;

        dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
        if (!dev)
                return -ENOMEM;

        dev->data = device;
        /* .enabled means the device can decode the resources */
        dev->active = device->status.enabled;
        status = acpi_get_handle(device->handle, "_SRS", &temp);
        if (ACPI_SUCCESS(status))
                dev->capabilities |= PNP_CONFIGURABLE;
        dev->capabilities |= PNP_READ;
        if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
                dev->capabilities |= PNP_WRITE;
        if (device->flags.removable)
                dev->capabilities |= PNP_REMOVABLE;
        status = acpi_get_handle(device->handle, "_DIS", &temp);
        if (ACPI_SUCCESS(status))
                dev->capabilities |= PNP_DISABLE;

        if (strlen(acpi_device_name(device)))
                strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
        else
                strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));

        if (dev->active)
                pnpacpi_parse_allocated_resource(dev);

        if (dev->capabilities & PNP_CONFIGURABLE)
                pnpacpi_parse_resource_option_data(dev);

        list_for_each_entry(id, &device->pnp.ids, list) {
                if (!strcmp(id->id, pnpid))
                        continue;
                if (!ispnpidacpi(id->id))
                        continue;
                pnp_add_id(dev, id->id);
        }

        /* clear out the damaged flags */
        if (!dev->active)
                pnp_init_resources(dev);
        pnp_add_device(dev);
        num++;

        return AE_OK;
}

static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
                                                     u32 lvl, void *context,
                                                     void **rv)
{
        struct acpi_device *device;

        if (!acpi_bus_get_device(handle, &device))
                pnpacpi_add_device(device);
        else
                return AE_CTRL_DEPTH;
        return AE_OK;
}

static int __init acpi_pnp_match(struct device *dev, void *_pnp)
{
        struct acpi_device *acpi = to_acpi_device(dev);
        struct pnp_dev *pnp = _pnp;

        /* true means it matched */
        return !acpi->physical_node_count
            && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
}

static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
{
        struct device *adev;
        struct acpi_device *acpi;

        adev = bus_find_device(&acpi_bus_type, NULL,
                               to_pnp_dev(dev), acpi_pnp_match);
        if (!adev)
                return -ENODEV;

        acpi = to_acpi_device(adev);
        *handle = acpi->handle;
        put_device(adev);
        return 0;
}

/* complete initialization of a PNPACPI device includes having
 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 */
static bool acpi_pnp_bus_match(struct device *dev)
{
        return dev->bus == &pnp_bus_type;
}

static struct acpi_bus_type __initdata acpi_pnp_bus = {
        .name        = "PNP",
        .match       = acpi_pnp_bus_match,
        .find_device = acpi_pnp_find_device,
};

int pnpacpi_disabled __initdata;
static int __init pnpacpi_init(void)
{
        if (acpi_disabled || pnpacpi_disabled) {
                printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
                return 0;
        }
        printk(KERN_INFO "pnp: PnP ACPI init\n");
        pnp_register_protocol(&pnpacpi_protocol);
        register_acpi_bus_type(&acpi_pnp_bus);
        acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
        printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
        unregister_acpi_bus_type(&acpi_pnp_bus);
        pnp_platform_devices = 1;
        return 0;
}

fs_initcall(pnpacpi_init);

static int __init pnpacpi_setup(char *str)
{
        if (str == NULL)
                return 1;
        if (!strncmp(str, "off", 3))
                pnpacpi_disabled = 1;
        return 1;
}

__setup("pnpacpi=", pnpacpi_setup);