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scan.c

/*
 * scan.c - support for transforming the ACPI namespace into individual objects
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/acpi.h>

#include <acpi/acpi_drivers.h>
#include <acpi/acinterp.h>    /* for acpi_ex_eisa_id_to_string() */

#define _COMPONENT            ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("scan");
#define STRUCT_TO_INT(s)      (*((int*)&s))
extern struct acpi_device *acpi_root;

#define ACPI_BUS_CLASS              "system_bus"
#define ACPI_BUS_HID                "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME        "System Bus"

static LIST_HEAD(acpi_device_list);
static LIST_HEAD(acpi_bus_id_list);
DEFINE_SPINLOCK(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);

struct acpi_device_bus_id{
      char bus_id[15];
      unsigned int instance_no;
      struct list_head node;
};

/*
 * Creates hid/cid(s) string needed for modalias and uevent
 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 * char *modalias: "acpi:IBM0001:ACPI0001"
*/
static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
                     int size)
{
      int len;

      if (!acpi_dev->flags.hardware_id)
            return -ENODEV;

      len = snprintf(modalias, size, "acpi:%s:",
                   acpi_dev->pnp.hardware_id);
      if (len < 0 || len >= size)
            return -EINVAL;
      size -= len;

      if (acpi_dev->flags.compatible_ids) {
            struct acpi_compatible_id_list *cid_list;
            int i;
            int count;

            cid_list = acpi_dev->pnp.cid_list;
            for (i = 0; i < cid_list->count; i++) {
                  count = snprintf(&modalias[len], size, "%s:",
                               cid_list->id[i].value);
                  if (count < 0 || count >= size) {
                        printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
                               acpi_dev->pnp.device_name, i);
                        break;
                  }
                  len += count;
                  size -= count;
            }
      }

      modalias[len] = '\0';
      return len;
}

static ssize_t
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      int len;

      /* Device has no HID and no CID or string is >1024 */
      len = create_modalias(acpi_dev, buf, 1024);
      if (len <= 0)
            return 0;
      buf[len++] = '\n';
      return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);

static int acpi_eject_operation(acpi_handle handle, int lockable)
{
      struct acpi_object_list arg_list;
      union acpi_object arg;
      acpi_status status = AE_OK;

      /*
       * TBD: evaluate _PS3?
       */

      if (lockable) {
            arg_list.count = 1;
            arg_list.pointer = &arg;
            arg.type = ACPI_TYPE_INTEGER;
            arg.integer.value = 0;
            acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
      }

      arg_list.count = 1;
      arg_list.pointer = &arg;
      arg.type = ACPI_TYPE_INTEGER;
      arg.integer.value = 1;

      /*
       * TBD: _EJD support.
       */

      status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
      if (ACPI_FAILURE(status)) {
            return (-ENODEV);
      }

      return (0);
}

static ssize_t
acpi_eject_store(struct device *d, struct device_attribute *attr,
            const char *buf, size_t count)
{
      int result;
      int ret = count;
      int islockable;
      acpi_status status;
      acpi_handle handle;
      acpi_object_type type = 0;
      struct acpi_device *acpi_device = to_acpi_device(d);

      if ((!count) || (buf[0] != '1')) {
            return -EINVAL;
      }
#ifndef FORCE_EJECT
      if (acpi_device->driver == NULL) {
            ret = -ENODEV;
            goto err;
      }
#endif
      status = acpi_get_type(acpi_device->handle, &type);
      if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
            ret = -ENODEV;
            goto err;
      }

      islockable = acpi_device->flags.lockable;
      handle = acpi_device->handle;

      result = acpi_bus_trim(acpi_device, 1);

      if (!result)
            result = acpi_eject_operation(handle, islockable);

      if (result) {
            ret = -EBUSY;
      }
      err:
      return ret;
}

static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);

static ssize_t
acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
      struct acpi_device *acpi_dev = to_acpi_device(dev);

      return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
}
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);

static ssize_t
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
      int result;

      result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
      if(result)
            goto end;

      result = sprintf(buf, "%s\n", (char*)path.pointer);
      kfree(path.pointer);
  end:
      return result;
}
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);

static int acpi_device_setup_files(struct acpi_device *dev)
{
      acpi_status status;
      acpi_handle temp;
      int result = 0;

      /*
       * Devices gotten from FADT don't have a "path" attribute
       */
      if(dev->handle) {
            result = device_create_file(&dev->dev, &dev_attr_path);
            if(result)
                  goto end;
      }

      if(dev->flags.hardware_id) {
            result = device_create_file(&dev->dev, &dev_attr_hid);
            if(result)
                  goto end;
      }

      if (dev->flags.hardware_id || dev->flags.compatible_ids){
            result = device_create_file(&dev->dev, &dev_attr_modalias);
            if(result)
                  goto end;
      }

        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
      status = acpi_get_handle(dev->handle, "_EJ0", &temp);
      if (ACPI_SUCCESS(status))
            result = device_create_file(&dev->dev, &dev_attr_eject);
  end:
      return result;
}

static void acpi_device_remove_files(struct acpi_device *dev)
{
      acpi_status status;
      acpi_handle temp;

      /*
       * If device has _EJ0, 'eject' file is created that is used to trigger
       * hot-removal function from userland.
       */
      status = acpi_get_handle(dev->handle, "_EJ0", &temp);
      if (ACPI_SUCCESS(status))
            device_remove_file(&dev->dev, &dev_attr_eject);

      if (dev->flags.hardware_id || dev->flags.compatible_ids)
            device_remove_file(&dev->dev, &dev_attr_modalias);

      if(dev->flags.hardware_id)
            device_remove_file(&dev->dev, &dev_attr_hid);
      if(dev->handle)
            device_remove_file(&dev->dev, &dev_attr_path);
}
/* --------------------------------------------------------------------------
                  ACPI Bus operations
   -------------------------------------------------------------------------- */

int acpi_match_device_ids(struct acpi_device *device,
                    const struct acpi_device_id *ids)
{
      const struct acpi_device_id *id;

      if (device->flags.hardware_id) {
            for (id = ids; id->id[0]; id++) {
                  if (!strcmp((char*)id->id, device->pnp.hardware_id))
                        return 0;
            }
      }

      if (device->flags.compatible_ids) {
            struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
            int i;

            for (id = ids; id->id[0]; id++) {
                  /* compare multiple _CID entries against driver ids */
                  for (i = 0; i < cid_list->count; i++) {
                        if (!strcmp((char*)id->id,
                                  cid_list->id[i].value))
                              return 0;
                  }
            }
      }

      return -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);

static void acpi_device_release(struct device *dev)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);

      kfree(acpi_dev->pnp.cid_list);
      kfree(acpi_dev);
}

static int acpi_device_suspend(struct device *dev, pm_message_t state)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = acpi_dev->driver;

      if (acpi_drv && acpi_drv->ops.suspend)
            return acpi_drv->ops.suspend(acpi_dev, state);
      return 0;
}

static int acpi_device_resume(struct device *dev)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = acpi_dev->driver;

      if (acpi_drv && acpi_drv->ops.resume)
            return acpi_drv->ops.resume(acpi_dev);
      return 0;
}

static int acpi_bus_match(struct device *dev, struct device_driver *drv)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = to_acpi_driver(drv);

      return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}

static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      int len;

      if (add_uevent_var(env, "MODALIAS="))
            return -ENOMEM;
      len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
                        sizeof(env->buf) - env->buflen);
      if (len >= (sizeof(env->buf) - env->buflen))
            return -ENOMEM;
      env->buflen += len;
      return 0;
}

static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_start_single_object(struct acpi_device *);
static int acpi_device_probe(struct device * dev)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
      int ret;

      ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
      if (!ret) {
            if (acpi_dev->bus_ops.acpi_op_start)
                  acpi_start_single_object(acpi_dev);
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                  "Found driver [%s] for device [%s]\n",
                  acpi_drv->name, acpi_dev->pnp.bus_id));
            get_device(dev);
      }
      return ret;
}

static int acpi_device_remove(struct device * dev)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = acpi_dev->driver;

      if (acpi_drv) {
            if (acpi_drv->ops.stop)
                  acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
            if (acpi_drv->ops.remove)
                  acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
      }
      acpi_dev->driver = NULL;
      acpi_driver_data(dev) = NULL;

      put_device(dev);
      return 0;
}

static void acpi_device_shutdown(struct device *dev)
{
      struct acpi_device *acpi_dev = to_acpi_device(dev);
      struct acpi_driver *acpi_drv = acpi_dev->driver;

      if (acpi_drv && acpi_drv->ops.shutdown)
            acpi_drv->ops.shutdown(acpi_dev);

      return ;
}

struct bus_type acpi_bus_type = {
      .name       = "acpi",
      .suspend    = acpi_device_suspend,
      .resume           = acpi_device_resume,
      .shutdown   = acpi_device_shutdown,
      .match            = acpi_bus_match,
      .probe            = acpi_device_probe,
      .remove           = acpi_device_remove,
      .uevent           = acpi_device_uevent,
};

static int acpi_device_register(struct acpi_device *device,
                         struct acpi_device *parent)
{
      int result;
      struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
      int found = 0;
      /*
       * Linkage
       * -------
       * Link this device to its parent and siblings.
       */
      INIT_LIST_HEAD(&device->children);
      INIT_LIST_HEAD(&device->node);
      INIT_LIST_HEAD(&device->g_list);
      INIT_LIST_HEAD(&device->wakeup_list);

      new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
      if (!new_bus_id) {
            printk(KERN_ERR PREFIX "Memory allocation error\n");
            return -ENOMEM;
      }

      spin_lock(&acpi_device_lock);
      /*
       * Find suitable bus_id and instance number in acpi_bus_id_list
       * If failed, create one and link it into acpi_bus_id_list
       */
      list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
            if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
                  acpi_device_bus_id->instance_no ++;
                  found = 1;
                  kfree(new_bus_id);
                  break;
            }
      }
      if(!found) {
            acpi_device_bus_id = new_bus_id;
            strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
            acpi_device_bus_id->instance_no = 0;
            list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
      }
      sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);

      if (device->parent) {
            list_add_tail(&device->node, &device->parent->children);
            list_add_tail(&device->g_list, &device->parent->g_list);
      } else
            list_add_tail(&device->g_list, &acpi_device_list);
      if (device->wakeup.flags.valid)
            list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
      spin_unlock(&acpi_device_lock);

      if (device->parent)
            device->dev.parent = &parent->dev;
      device->dev.bus = &acpi_bus_type;
      device_initialize(&device->dev);
      device->dev.release = &acpi_device_release;
      result = device_add(&device->dev);
      if(result) {
            printk("Error adding device %s", device->dev.bus_id);
            goto end;
      }

      result = acpi_device_setup_files(device);
      if(result)
            ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));

      device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
      return 0;
  end:
      spin_lock(&acpi_device_lock);
      if (device->parent) {
            list_del(&device->node);
            list_del(&device->g_list);
      } else
            list_del(&device->g_list);
      list_del(&device->wakeup_list);
      spin_unlock(&acpi_device_lock);
      return result;
}

static void acpi_device_unregister(struct acpi_device *device, int type)
{
      spin_lock(&acpi_device_lock);
      if (device->parent) {
            list_del(&device->node);
            list_del(&device->g_list);
      } else
            list_del(&device->g_list);

      list_del(&device->wakeup_list);
      spin_unlock(&acpi_device_lock);

      acpi_detach_data(device->handle, acpi_bus_data_handler);

      acpi_device_remove_files(device);
      device_unregister(&device->dev);
}

/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
/**
 * acpi_bus_driver_init - add a device to a driver
 * @device: the device to add and initialize
 * @driver: driver for the device
 *
 * Used to initialize a device via its device driver.  Called whenever a 
 * driver is bound to a device.  Invokes the driver's add() ops.
 */
static int
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
{
      int result = 0;


      if (!device || !driver)
            return -EINVAL;

      if (!driver->ops.add)
            return -ENOSYS;

      result = driver->ops.add(device);
      if (result) {
            device->driver = NULL;
            acpi_driver_data(device) = NULL;
            return result;
      }

      device->driver = driver;

      /*
       * TBD - Configuration Management: Assign resources to device based
       * upon possible configuration and currently allocated resources.
       */

      ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                    "Driver successfully bound to device\n"));
      return 0;
}

static int acpi_start_single_object(struct acpi_device *device)
{
      int result = 0;
      struct acpi_driver *driver;


      if (!(driver = device->driver))
            return 0;

      if (driver->ops.start) {
            result = driver->ops.start(device);
            if (result && driver->ops.remove)
                  driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
      }

      return result;
}

/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
{
      int ret;

      if (acpi_disabled)
            return -ENODEV;
      driver->drv.name = driver->name;
      driver->drv.bus = &acpi_bus_type;
      driver->drv.owner = driver->owner;

      ret = driver_register(&driver->drv);
      return ret;
}

EXPORT_SYMBOL(acpi_bus_register_driver);

/**
 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 * @driver: driver to unregister
 *
 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and unbinds.
 */
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
      driver_unregister(&driver->drv);
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
      acpi_status status;
      acpi_handle tmp;
      struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
      union acpi_object *obj;

      status = acpi_get_handle(handle, "_EJD", &tmp);
      if (ACPI_FAILURE(status))
            return status;

      status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
      if (ACPI_SUCCESS(status)) {
            obj = buffer.pointer;
            status = acpi_get_handle(NULL, obj->string.pointer, ejd);
            kfree(buffer.pointer);
      }
      return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
{

      /* TBD */

      return;
}

static int acpi_bus_get_perf_flags(struct acpi_device *device)
{
      device->performance.state = ACPI_STATE_UNKNOWN;
      return 0;
}

static acpi_status
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
                                   union acpi_object *package)
{
      int i = 0;
      union acpi_object *element = NULL;

      if (!device || !package || (package->package.count < 2))
            return AE_BAD_PARAMETER;

      element = &(package->package.elements[0]);
      if (!element)
            return AE_BAD_PARAMETER;
      if (element->type == ACPI_TYPE_PACKAGE) {
            if ((element->package.count < 2) ||
                (element->package.elements[0].type !=
                 ACPI_TYPE_LOCAL_REFERENCE)
                || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
                  return AE_BAD_DATA;
            device->wakeup.gpe_device =
                element->package.elements[0].reference.handle;
            device->wakeup.gpe_number =
                (u32) element->package.elements[1].integer.value;
      } else if (element->type == ACPI_TYPE_INTEGER) {
            device->wakeup.gpe_number = element->integer.value;
      } else
            return AE_BAD_DATA;

      element = &(package->package.elements[1]);
      if (element->type != ACPI_TYPE_INTEGER) {
            return AE_BAD_DATA;
      }
      device->wakeup.sleep_state = element->integer.value;

      if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
            return AE_NO_MEMORY;
      }
      device->wakeup.resources.count = package->package.count - 2;
      for (i = 0; i < device->wakeup.resources.count; i++) {
            element = &(package->package.elements[i + 2]);
            if (element->type != ACPI_TYPE_ANY) {
                  return AE_BAD_DATA;
            }

            device->wakeup.resources.handles[i] = element->reference.handle;
      }

      return AE_OK;
}

static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{
      acpi_status status = 0;
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
      union acpi_object *package = NULL;

      struct acpi_device_id button_device_ids[] = {
            {"PNP0C0D", 0},
            {"PNP0C0C", 0},
            {"PNP0C0E", 0},
            {"", 0},
      };


      /* _PRW */
      status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
            goto end;
      }

      package = (union acpi_object *)buffer.pointer;
      status = acpi_bus_extract_wakeup_device_power_package(device, package);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
            goto end;
      }

      kfree(buffer.pointer);

      device->wakeup.flags.valid = 1;
      /* Power button, Lid switch always enable wakeup */
      if (!acpi_match_device_ids(device, button_device_ids))
            device->wakeup.flags.run_wake = 1;

      end:
      if (ACPI_FAILURE(status))
            device->flags.wake_capable = 0;
      return 0;
}

static int acpi_bus_get_power_flags(struct acpi_device *device)
{
      acpi_status status = 0;
      acpi_handle handle = NULL;
      u32 i = 0;


      /*
       * Power Management Flags
       */
      status = acpi_get_handle(device->handle, "_PSC", &handle);
      if (ACPI_SUCCESS(status))
            device->power.flags.explicit_get = 1;
      status = acpi_get_handle(device->handle, "_IRC", &handle);
      if (ACPI_SUCCESS(status))
            device->power.flags.inrush_current = 1;

      /*
       * Enumerate supported power management states
       */
      for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
            struct acpi_device_power_state *ps = &device->power.states[i];
            char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };

            /* Evaluate "_PRx" to se if power resources are referenced */
            acpi_evaluate_reference(device->handle, object_name, NULL,
                              &ps->resources);
            if (ps->resources.count) {
                  device->power.flags.power_resources = 1;
                  ps->flags.valid = 1;
            }

            /* Evaluate "_PSx" to see if we can do explicit sets */
            object_name[2] = 'S';
            status = acpi_get_handle(device->handle, object_name, &handle);
            if (ACPI_SUCCESS(status)) {
                  ps->flags.explicit_set = 1;
                  ps->flags.valid = 1;
            }

            /* State is valid if we have some power control */
            if (ps->resources.count || ps->flags.explicit_set)
                  ps->flags.valid = 1;

            ps->power = -1;   /* Unknown - driver assigned */
            ps->latency = -1; /* Unknown - driver assigned */
      }

      /* Set defaults for D0 and D3 states (always valid) */
      device->power.states[ACPI_STATE_D0].flags.valid = 1;
      device->power.states[ACPI_STATE_D0].power = 100;
      device->power.states[ACPI_STATE_D3].flags.valid = 1;
      device->power.states[ACPI_STATE_D3].power = 0;

      /* TBD: System wake support and resource requirements. */

      device->power.state = ACPI_STATE_UNKNOWN;

      return 0;
}

static int acpi_bus_get_flags(struct acpi_device *device)
{
      acpi_status status = AE_OK;
      acpi_handle temp = NULL;


      /* Presence of _STA indicates 'dynamic_status' */
      status = acpi_get_handle(device->handle, "_STA", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.dynamic_status = 1;

      /* Presence of _CID indicates 'compatible_ids' */
      status = acpi_get_handle(device->handle, "_CID", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.compatible_ids = 1;

      /* Presence of _RMV indicates 'removable' */
      status = acpi_get_handle(device->handle, "_RMV", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.removable = 1;

      /* Presence of _EJD|_EJ0 indicates 'ejectable' */
      status = acpi_get_handle(device->handle, "_EJD", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.ejectable = 1;
      else {
            status = acpi_get_handle(device->handle, "_EJ0", &temp);
            if (ACPI_SUCCESS(status))
                  device->flags.ejectable = 1;
      }

      /* Presence of _LCK indicates 'lockable' */
      status = acpi_get_handle(device->handle, "_LCK", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.lockable = 1;

      /* Presence of _PS0|_PR0 indicates 'power manageable' */
      status = acpi_get_handle(device->handle, "_PS0", &temp);
      if (ACPI_FAILURE(status))
            status = acpi_get_handle(device->handle, "_PR0", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.power_manageable = 1;

      /* Presence of _PRW indicates wake capable */
      status = acpi_get_handle(device->handle, "_PRW", &temp);
      if (ACPI_SUCCESS(status))
            device->flags.wake_capable = 1;

      /* TBD: Peformance management */

      return 0;
}

static void acpi_device_get_busid(struct acpi_device *device,
                          acpi_handle handle, int type)
{
      char bus_id[5] = { '?', 0 };
      struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
      int i = 0;

      /*
       * Bus ID
       * ------
       * The device's Bus ID is simply the object name.
       * TBD: Shouldn't this value be unique (within the ACPI namespace)?
       */
      switch (type) {
      case ACPI_BUS_TYPE_SYSTEM:
            strcpy(device->pnp.bus_id, "ACPI");
            break;
      case ACPI_BUS_TYPE_POWER_BUTTON:
            strcpy(device->pnp.bus_id, "PWRF");
            break;
      case ACPI_BUS_TYPE_SLEEP_BUTTON:
            strcpy(device->pnp.bus_id, "SLPF");
            break;
      default:
            acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
            /* Clean up trailing underscores (if any) */
            for (i = 3; i > 1; i--) {
                  if (bus_id[i] == '_')
                        bus_id[i] = '\0';
                  else
                        break;
            }
            strcpy(device->pnp.bus_id, bus_id);
            break;
      }
}

static int
acpi_video_bus_match(struct acpi_device *device)
{
      acpi_handle h_dummy1;
      acpi_handle h_dummy2;
      acpi_handle h_dummy3;


      if (!device)
            return -EINVAL;

      /* Since there is no HID, CID for ACPI Video drivers, we have
       * to check well known required nodes for each feature we support.
       */

      /* Does this device able to support video switching ? */
      if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
          ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
            return 0;

      /* Does this device able to retrieve a video ROM ? */
      if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
            return 0;

      /* Does this device able to configure which video head to be POSTed ? */
      if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
          ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
          ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
            return 0;

      return -ENODEV;
}

/*
 * acpi_bay_match - see if a device is an ejectable driver bay
 *
 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 * then we can safely call it an ejectable drive bay
 */
static int acpi_bay_match(struct acpi_device *device){
      acpi_status status;
      acpi_handle handle;
      acpi_handle tmp;
      acpi_handle phandle;

      handle = device->handle;

      status = acpi_get_handle(handle, "_EJ0", &tmp);
      if (ACPI_FAILURE(status))
            return -ENODEV;

      if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
            (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
            (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
            (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
            return 0;

      if (acpi_get_parent(handle, &phandle))
            return -ENODEV;

        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
                return 0;

      return -ENODEV;
}

static void acpi_device_set_id(struct acpi_device *device,
                         struct acpi_device *parent, acpi_handle handle,
                         int type)
{
      struct acpi_device_info *info;
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
      char *hid = NULL;
      char *uid = NULL;
      struct acpi_compatible_id_list *cid_list = NULL;
      acpi_status status;

      switch (type) {
      case ACPI_BUS_TYPE_DEVICE:
            status = acpi_get_object_info(handle, &buffer);
            if (ACPI_FAILURE(status)) {
                  printk("%s: Error reading device info\n", __FUNCTION__);
                  return;
            }

            info = buffer.pointer;
            if (info->valid & ACPI_VALID_HID)
                  hid = info->hardware_id.value;
            if (info->valid & ACPI_VALID_UID)
                  uid = info->unique_id.value;
            if (info->valid & ACPI_VALID_CID)
                  cid_list = &info->compatibility_id;
            if (info->valid & ACPI_VALID_ADR) {
                  device->pnp.bus_address = info->address;
                  device->flags.bus_address = 1;
            }

            if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
                  status = acpi_video_bus_match(device);
                  if(ACPI_SUCCESS(status))
                        hid = ACPI_VIDEO_HID;

                  status = acpi_bay_match(device);
                  if (ACPI_SUCCESS(status))
                        hid = ACPI_BAY_HID;
            }
            break;
      case ACPI_BUS_TYPE_POWER:
            hid = ACPI_POWER_HID;
            break;
      case ACPI_BUS_TYPE_PROCESSOR:
            hid = ACPI_PROCESSOR_HID;
            break;
      case ACPI_BUS_TYPE_SYSTEM:
            hid = ACPI_SYSTEM_HID;
            break;
      case ACPI_BUS_TYPE_THERMAL:
            hid = ACPI_THERMAL_HID;
            break;
      case ACPI_BUS_TYPE_POWER_BUTTON:
            hid = ACPI_BUTTON_HID_POWERF;
            break;
      case ACPI_BUS_TYPE_SLEEP_BUTTON:
            hid = ACPI_BUTTON_HID_SLEEPF;
            break;
      }

      /* 
       * \_SB
       * ----
       * Fix for the system root bus device -- the only root-level device.
       */
      if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
            hid = ACPI_BUS_HID;
            strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
            strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
      }

      if (hid) {
            strcpy(device->pnp.hardware_id, hid);
            device->flags.hardware_id = 1;
      }
      if (uid) {
            strcpy(device->pnp.unique_id, uid);
            device->flags.unique_id = 1;
      }
      if (cid_list) {
            device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
            if (device->pnp.cid_list)
                  memcpy(device->pnp.cid_list, cid_list, cid_list->size);
            else
                  printk(KERN_ERR "Memory allocation error\n");
      }

      kfree(buffer.pointer);
}

static int acpi_device_set_context(struct acpi_device *device, int type)
{
      acpi_status status = AE_OK;
      int result = 0;
      /*
       * Context
       * -------
       * Attach this 'struct acpi_device' to the ACPI object.  This makes
       * resolutions from handle->device very efficient.  Note that we need
       * to be careful with fixed-feature devices as they all attach to the
       * root object.
       */
      if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
          type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
            status = acpi_attach_data(device->handle,
                                acpi_bus_data_handler, device);

            if (ACPI_FAILURE(status)) {
                  printk("Error attaching device data\n");
                  result = -ENODEV;
            }
      }
      return result;
}

static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
{
      if (!dev)
            return -EINVAL;

      dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
      device_release_driver(&dev->dev);

      if (!rmdevice)
            return 0;

      /*
       * unbind _ADR-Based Devices when hot removal
       */
      if (dev->flags.bus_address) {
            if ((dev->parent) && (dev->parent->ops.unbind))
                  dev->parent->ops.unbind(dev);
      }
      acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);

      return 0;
}

static int
acpi_add_single_object(struct acpi_device **child,
                   struct acpi_device *parent, acpi_handle handle, int type,
                  struct acpi_bus_ops *ops)
{
      int result = 0;
      struct acpi_device *device = NULL;


      if (!child)
            return -EINVAL;

      device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
      if (!device) {
            printk(KERN_ERR PREFIX "Memory allocation error\n");
            return -ENOMEM;
      }

      device->handle = handle;
      device->parent = parent;
      device->bus_ops = *ops; /* workround for not call .start */


      acpi_device_get_busid(device, handle, type);

      /*
       * Flags
       * -----
       * Get prior to calling acpi_bus_get_status() so we know whether
       * or not _STA is present.  Note that we only look for object
       * handles -- cannot evaluate objects until we know the device is
       * present and properly initialized.
       */
      result = acpi_bus_get_flags(device);
      if (result)
            goto end;

      /*
       * Status
       * ------
       * See if the device is present.  We always assume that non-Device
       * and non-Processor objects (e.g. thermal zones, power resources,
       * etc.) are present, functioning, etc. (at least when parent object
       * is present).  Note that _STA has a different meaning for some
       * objects (e.g. power resources) so we need to be careful how we use
       * it.
       */
      switch (type) {
      case ACPI_BUS_TYPE_PROCESSOR:
      case ACPI_BUS_TYPE_DEVICE:
            result = acpi_bus_get_status(device);
            if (ACPI_FAILURE(result) || !device->status.present) {
                  result = -ENOENT;
                  goto end;
            }
            break;
      default:
            STRUCT_TO_INT(device->status) =
                ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
                ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
            break;
      }

      /*
       * Initialize Device
       * -----------------
       * TBD: Synch with Core's enumeration/initialization process.
       */

      /*
       * Hardware ID, Unique ID, & Bus Address
       * -------------------------------------
       */
      acpi_device_set_id(device, parent, handle, type);

      /*
       * Power Management
       * ----------------
       */
      if (device->flags.power_manageable) {
            result = acpi_bus_get_power_flags(device);
            if (result)
                  goto end;
      }

      /*
       * Wakeup device management
       *-----------------------
       */
      if (device->flags.wake_capable) {
            result = acpi_bus_get_wakeup_device_flags(device);
            if (result)
                  goto end;
      }

      /*
       * Performance Management
       * ----------------------
       */
      if (device->flags.performance_manageable) {
            result = acpi_bus_get_perf_flags(device);
            if (result)
                  goto end;
      }

      if ((result = acpi_device_set_context(device, type)))
            goto end;

      result = acpi_device_register(device, parent);

      /*
       * Bind _ADR-Based Devices when hot add
       */
      if (device->flags.bus_address) {
            if (device->parent && device->parent->ops.bind)
                  device->parent->ops.bind(device);
      }

      end:
      if (!result)
            *child = device;
      else {
            kfree(device->pnp.cid_list);
            kfree(device);
      }

      return result;
}

static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
{
      acpi_status status = AE_OK;
      struct acpi_device *parent = NULL;
      struct acpi_device *child = NULL;
      acpi_handle phandle = NULL;
      acpi_handle chandle = NULL;
      acpi_object_type type = 0;
      u32 level = 1;


      if (!start)
            return -EINVAL;

      parent = start;
      phandle = start->handle;

      /*
       * Parse through the ACPI namespace, identify all 'devices', and
       * create a new 'struct acpi_device' for each.
       */
      while ((level > 0) && parent) {

            status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
                                    chandle, &chandle);

            /*
             * If this scope is exhausted then move our way back up.
             */
            if (ACPI_FAILURE(status)) {
                  level--;
                  chandle = phandle;
                  acpi_get_parent(phandle, &phandle);
                  if (parent->parent)
                        parent = parent->parent;
                  continue;
            }

            status = acpi_get_type(chandle, &type);
            if (ACPI_FAILURE(status))
                  continue;

            /*
             * If this is a scope object then parse it (depth-first).
             */
            if (type == ACPI_TYPE_LOCAL_SCOPE) {
                  level++;
                  phandle = chandle;
                  chandle = NULL;
                  continue;
            }

            /*
             * We're only interested in objects that we consider 'devices'.
             */
            switch (type) {
            case ACPI_TYPE_DEVICE:
                  type = ACPI_BUS_TYPE_DEVICE;
                  break;
            case ACPI_TYPE_PROCESSOR:
                  type = ACPI_BUS_TYPE_PROCESSOR;
                  break;
            case ACPI_TYPE_THERMAL:
                  type = ACPI_BUS_TYPE_THERMAL;
                  break;
            case ACPI_TYPE_POWER:
                  type = ACPI_BUS_TYPE_POWER;
                  break;
            default:
                  continue;
            }

            if (ops->acpi_op_add)
                  status = acpi_add_single_object(&child, parent,
                        chandle, type, ops);
            else
                  status = acpi_bus_get_device(chandle, &child);

            if (ACPI_FAILURE(status))
                  continue;

            if (ops->acpi_op_start && !(ops->acpi_op_add)) {
                  status = acpi_start_single_object(child);
                  if (ACPI_FAILURE(status))
                        continue;
            }

            /*
             * If the device is present, enabled, and functioning then
             * parse its scope (depth-first).  Note that we need to
             * represent absent devices to facilitate PnP notifications
             * -- but only the subtree head (not all of its children,
             * which will be enumerated when the parent is inserted).
             *
             * TBD: Need notifications and other detection mechanisms
             *      in place before we can fully implement this.
             */
            if (child->status.present) {
                  status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
                                          NULL, NULL);
                  if (ACPI_SUCCESS(status)) {
                        level++;
                        phandle = chandle;
                        chandle = NULL;
                        parent = child;
                  }
            }
      }

      return 0;
}

int
acpi_bus_add(struct acpi_device **child,
           struct acpi_device *parent, acpi_handle handle, int type)
{
      int result;
      struct acpi_bus_ops ops;

      memset(&ops, 0, sizeof(ops));
      ops.acpi_op_add = 1;

      result = acpi_add_single_object(child, parent, handle, type, &ops);
      if (!result)
            result = acpi_bus_scan(*child, &ops);

      return result;
}

EXPORT_SYMBOL(acpi_bus_add);

int acpi_bus_start(struct acpi_device *device)
{
      int result;
      struct acpi_bus_ops ops;


      if (!device)
            return -EINVAL;

      result = acpi_start_single_object(device);
      if (!result) {
            memset(&ops, 0, sizeof(ops));
            ops.acpi_op_start = 1;
            result = acpi_bus_scan(device, &ops);
      }
      return result;
}

EXPORT_SYMBOL(acpi_bus_start);

int acpi_bus_trim(struct acpi_device *start, int rmdevice)
{
      acpi_status status;
      struct acpi_device *parent, *child;
      acpi_handle phandle, chandle;
      acpi_object_type type;
      u32 level = 1;
      int err = 0;

      parent = start;
      phandle = start->handle;
      child = chandle = NULL;

      while ((level > 0) && parent && (!err)) {
            status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
                                    chandle, &chandle);

            /*
             * If this scope is exhausted then move our way back up.
             */
            if (ACPI_FAILURE(status)) {
                  level--;
                  chandle = phandle;
                  acpi_get_parent(phandle, &phandle);
                  child = parent;
                  parent = parent->parent;

                  if (level == 0)
                        err = acpi_bus_remove(child, rmdevice);
                  else
                        err = acpi_bus_remove(child, 1);

                  continue;
            }

            status = acpi_get_type(chandle, &type);
            if (ACPI_FAILURE(status)) {
                  continue;
            }
            /*
             * If there is a device corresponding to chandle then
             * parse it (depth-first).
             */
            if (acpi_bus_get_device(chandle, &child) == 0) {
                  level++;
                  phandle = chandle;
                  chandle = NULL;
                  parent = child;
            }
            continue;
      }
      return err;
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);


static int acpi_bus_scan_fixed(struct acpi_device *root)
{
      int result = 0;
      struct acpi_device *device = NULL;
      struct acpi_bus_ops ops;

      if (!root)
            return -ENODEV;

      memset(&ops, 0, sizeof(ops));
      ops.acpi_op_add = 1;
      ops.acpi_op_start = 1;

      /*
       * Enumerate all fixed-feature devices.
       */
      if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
            result = acpi_add_single_object(&device, acpi_root,
                                    NULL,
                                    ACPI_BUS_TYPE_POWER_BUTTON,
                                    &ops);
      }

      if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
            result = acpi_add_single_object(&device, acpi_root,
                                    NULL,
                                    ACPI_BUS_TYPE_SLEEP_BUTTON,
                                    &ops);
      }

      return result;
}

int __init acpi_boot_ec_enable(void);

static int __init acpi_scan_init(void)
{
      int result;
      struct acpi_bus_ops ops;


      if (acpi_disabled)
            return 0;

      memset(&ops, 0, sizeof(ops));
      ops.acpi_op_add = 1;
      ops.acpi_op_start = 1;

      result = bus_register(&acpi_bus_type);
      if (result) {
            /* We don't want to quit even if we failed to add suspend/resume */
            printk(KERN_ERR PREFIX "Could not register bus type\n");
      }

      /*
       * Create the root device in the bus's device tree
       */
      result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
                              ACPI_BUS_TYPE_SYSTEM, &ops);
      if (result)
            goto Done;

      /*
       * Enumerate devices in the ACPI namespace.
       */
      result = acpi_bus_scan_fixed(acpi_root);

      /* EC region might be needed at bus_scan, so enable it now */
      acpi_boot_ec_enable();

      if (!result)
            result = acpi_bus_scan(acpi_root, &ops);

      if (result)
            acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);

      Done:
      return result;
}

subsys_initcall(acpi_scan_init);

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