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bus.c

/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@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 of the License, 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/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#endif
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT            ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("bus");
#ifdef      CONFIG_X86
extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
#endif

struct acpi_device *acpi_root;
struct proc_dir_entry *acpi_root_dir;
EXPORT_SYMBOL(acpi_root_dir);

#define STRUCT_TO_INT(s)      (*((int*)&s))

/* --------------------------------------------------------------------------
                                Device Management
   -------------------------------------------------------------------------- */

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
      acpi_status status = AE_OK;


      if (!device)
            return -EINVAL;

      /* TBD: Support fixed-feature devices */

      status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
      if (ACPI_FAILURE(status) || !*device) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
                          handle));
            return -ENODEV;
      }

      return 0;
}

EXPORT_SYMBOL(acpi_bus_get_device);

int acpi_bus_get_status(struct acpi_device *device)
{
      acpi_status status = AE_OK;
      unsigned long sta = 0;


      if (!device)
            return -EINVAL;

      /*
       * Evaluate _STA if present.
       */
      if (device->flags.dynamic_status) {
            status =
                acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
            if (ACPI_FAILURE(status))
                  return -ENODEV;
            STRUCT_TO_INT(device->status) = (int)sta;
      }

      /*
       * Otherwise we assume the status of our parent (unless we don't
       * have one, in which case status is implied).
       */
      else if (device->parent)
            device->status = device->parent->status;
      else
            STRUCT_TO_INT(device->status) =
                ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
                ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;

      if (device->status.functional && !device->status.present) {
            printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
                   "functional but not present; setting present\n",
                   device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
            device->status.present = 1;
      }

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
                    device->pnp.bus_id,
                    (u32) STRUCT_TO_INT(device->status)));

      return 0;
}

EXPORT_SYMBOL(acpi_bus_get_status);

/* --------------------------------------------------------------------------
                                 Power Management
   -------------------------------------------------------------------------- */

int acpi_bus_get_power(acpi_handle handle, int *state)
{
      int result = 0;
      acpi_status status = 0;
      struct acpi_device *device = NULL;
      unsigned long psc = 0;


      result = acpi_bus_get_device(handle, &device);
      if (result)
            return result;

      *state = ACPI_STATE_UNKNOWN;

      if (!device->flags.power_manageable) {
            /* TBD: Non-recursive algorithm for walking up hierarchy */
            if (device->parent)
                  *state = device->parent->power.state;
            else
                  *state = ACPI_STATE_D0;
      } else {
            /*
             * Get the device's power state either directly (via _PSC) or
             * indirectly (via power resources).
             */
            if (device->power.flags.explicit_get) {
                  status = acpi_evaluate_integer(device->handle, "_PSC",
                                           NULL, &psc);
                  if (ACPI_FAILURE(status))
                        return -ENODEV;
                  device->power.state = (int)psc;
            } else if (device->power.flags.power_resources) {
                  result = acpi_power_get_inferred_state(device);
                  if (result)
                        return result;
            }

            *state = device->power.state;
      }

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
                    device->pnp.bus_id, device->power.state));

      return 0;
}

EXPORT_SYMBOL(acpi_bus_get_power);

int acpi_bus_set_power(acpi_handle handle, int state)
{
      int result = 0;
      acpi_status status = AE_OK;
      struct acpi_device *device = NULL;
      char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };


      result = acpi_bus_get_device(handle, &device);
      if (result)
            return result;

      if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
            return -EINVAL;

      /* Make sure this is a valid target state */

      if (!device->flags.power_manageable) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
                        kobject_name(&device->dev.kobj)));
            return -ENODEV;
      }
      /*
       * Get device's current power state
       */
      acpi_bus_get_power(device->handle, &device->power.state);
      if ((state == device->power.state) && !device->flags.force_power_state) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
                          state));
            return 0;
      }

      if (!device->power.states[state].flags.valid) {
            printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
            return -ENODEV;
      }
      if (device->parent && (state < device->parent->power.state)) {
            printk(KERN_WARNING PREFIX
                        "Cannot set device to a higher-powered"
                        " state than parent\n");
            return -ENODEV;
      }

      /*
       * Transition Power
       * ----------------
       * On transitions to a high-powered state we first apply power (via
       * power resources) then evalute _PSx.  Conversly for transitions to
       * a lower-powered state.
       */
      if (state < device->power.state) {
            if (device->power.flags.power_resources) {
                  result = acpi_power_transition(device, state);
                  if (result)
                        goto end;
            }
            if (device->power.states[state].flags.explicit_set) {
                  status = acpi_evaluate_object(device->handle,
                                          object_name, NULL, NULL);
                  if (ACPI_FAILURE(status)) {
                        result = -ENODEV;
                        goto end;
                  }
            }
      } else {
            if (device->power.states[state].flags.explicit_set) {
                  status = acpi_evaluate_object(device->handle,
                                          object_name, NULL, NULL);
                  if (ACPI_FAILURE(status)) {
                        result = -ENODEV;
                        goto end;
                  }
            }
            if (device->power.flags.power_resources) {
                  result = acpi_power_transition(device, state);
                  if (result)
                        goto end;
            }
      }

      end:
      if (result)
            printk(KERN_WARNING PREFIX
                        "Transitioning device [%s] to D%d\n",
                        device->pnp.bus_id, state);
      else {
            device->power.state = state;
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Device [%s] transitioned to D%d\n",
                          device->pnp.bus_id, state));
      }

      return result;
}

EXPORT_SYMBOL(acpi_bus_set_power);

/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROC_EVENT
static DEFINE_SPINLOCK(acpi_bus_event_lock);

LIST_HEAD(acpi_bus_event_list);
DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);

extern int event_is_open;

int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
{
      struct acpi_bus_event *event;
      unsigned long flags = 0;

      /* drop event on the floor if no one's listening */
      if (!event_is_open)
            return 0;

      event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
      if (!event)
            return -ENOMEM;

      strcpy(event->device_class, device_class);
      strcpy(event->bus_id, bus_id);
      event->type = type;
      event->data = data;

      spin_lock_irqsave(&acpi_bus_event_lock, flags);
      list_add_tail(&event->node, &acpi_bus_event_list);
      spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

      wake_up_interruptible(&acpi_bus_event_queue);

      return 0;

}

EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);

int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
{
      if (!device)
            return -EINVAL;
      return acpi_bus_generate_proc_event4(device->pnp.device_class,
                                   device->pnp.bus_id, type, data);
}

EXPORT_SYMBOL(acpi_bus_generate_proc_event);

int acpi_bus_receive_event(struct acpi_bus_event *event)
{
      unsigned long flags = 0;
      struct acpi_bus_event *entry = NULL;

      DECLARE_WAITQUEUE(wait, current);


      if (!event)
            return -EINVAL;

      if (list_empty(&acpi_bus_event_list)) {

            set_current_state(TASK_INTERRUPTIBLE);
            add_wait_queue(&acpi_bus_event_queue, &wait);

            if (list_empty(&acpi_bus_event_list))
                  schedule();

            remove_wait_queue(&acpi_bus_event_queue, &wait);
            set_current_state(TASK_RUNNING);

            if (signal_pending(current))
                  return -ERESTARTSYS;
      }

      spin_lock_irqsave(&acpi_bus_event_lock, flags);
      entry =
          list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
      if (entry)
            list_del(&entry->node);
      spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

      if (!entry)
            return -ENODEV;

      memcpy(event, entry, sizeof(struct acpi_bus_event));

      kfree(entry);

      return 0;
}

EXPORT_SYMBOL(acpi_bus_receive_event);
#endif      /* CONFIG_ACPI_PROC_EVENT */

/* --------------------------------------------------------------------------
                             Notification Handling
   -------------------------------------------------------------------------- */

static int
acpi_bus_check_device(struct acpi_device *device, int *status_changed)
{
      acpi_status status = 0;
      struct acpi_device_status old_status;


      if (!device)
            return -EINVAL;

      if (status_changed)
            *status_changed = 0;

      old_status = device->status;

      /*
       * Make sure this device's parent is present before we go about
       * messing with the device.
       */
      if (device->parent && !device->parent->status.present) {
            device->status = device->parent->status;
            if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
                  if (status_changed)
                        *status_changed = 1;
            }
            return 0;
      }

      status = acpi_bus_get_status(device);
      if (ACPI_FAILURE(status))
            return -ENODEV;

      if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
            return 0;

      if (status_changed)
            *status_changed = 1;

      /*
       * Device Insertion/Removal
       */
      if ((device->status.present) && !(old_status.present)) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
            /* TBD: Handle device insertion */
      } else if (!(device->status.present) && (old_status.present)) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
            /* TBD: Handle device removal */
      }

      return 0;
}

static int acpi_bus_check_scope(struct acpi_device *device)
{
      int result = 0;
      int status_changed = 0;


      if (!device)
            return -EINVAL;

      /* Status Change? */
      result = acpi_bus_check_device(device, &status_changed);
      if (result)
            return result;

      if (!status_changed)
            return 0;

      /*
       * TBD: Enumerate child devices within this device's scope and
       *       run acpi_bus_check_device()'s on them.
       */

      return 0;
}

/**
 * acpi_bus_notify
 * ---------------
 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 */
static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
{
      int result = 0;
      struct acpi_device *device = NULL;


      if (acpi_bus_get_device(handle, &device))
            return;

      switch (type) {

      case ACPI_NOTIFY_BUS_CHECK:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received BUS CHECK notification for device [%s]\n",
                          device->pnp.bus_id));
            result = acpi_bus_check_scope(device);
            /*
             * TBD: We'll need to outsource certain events to non-ACPI
             *      drivers via the device manager (device.c).
             */
            break;

      case ACPI_NOTIFY_DEVICE_CHECK:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received DEVICE CHECK notification for device [%s]\n",
                          device->pnp.bus_id));
            result = acpi_bus_check_device(device, NULL);
            /*
             * TBD: We'll need to outsource certain events to non-ACPI
             *      drivers via the device manager (device.c).
             */
            break;

      case ACPI_NOTIFY_DEVICE_WAKE:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received DEVICE WAKE notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD */
            break;

      case ACPI_NOTIFY_EJECT_REQUEST:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received EJECT REQUEST notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD */
            break;

      case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received DEVICE CHECK LIGHT notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD: Exactly what does 'light' mean? */
            break;

      case ACPI_NOTIFY_FREQUENCY_MISMATCH:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received FREQUENCY MISMATCH notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD */
            break;

      case ACPI_NOTIFY_BUS_MODE_MISMATCH:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received BUS MODE MISMATCH notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD */
            break;

      case ACPI_NOTIFY_POWER_FAULT:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received POWER FAULT notification for device [%s]\n",
                          device->pnp.bus_id));
            /* TBD */
            break;

      default:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Received unknown/unsupported notification [%08x]\n",
                          type));
            break;
      }

      return;
}

/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

static int __init acpi_bus_init_irq(void)
{
      acpi_status status = AE_OK;
      union acpi_object arg = { ACPI_TYPE_INTEGER };
      struct acpi_object_list arg_list = { 1, &arg };
      char *message = NULL;


      /*
       * Let the system know what interrupt model we are using by
       * evaluating the \_PIC object, if exists.
       */

      switch (acpi_irq_model) {
      case ACPI_IRQ_MODEL_PIC:
            message = "PIC";
            break;
      case ACPI_IRQ_MODEL_IOAPIC:
            message = "IOAPIC";
            break;
      case ACPI_IRQ_MODEL_IOSAPIC:
            message = "IOSAPIC";
            break;
      case ACPI_IRQ_MODEL_PLATFORM:
            message = "platform specific model";
            break;
      default:
            printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
            return -ENODEV;
      }

      printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

      arg.integer.value = acpi_irq_model;

      status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
      if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
            return -ENODEV;
      }

      return 0;
}

acpi_native_uint acpi_gbl_permanent_mmap;


void __init acpi_early_init(void)
{
      acpi_status status = AE_OK;

      if (acpi_disabled)
            return;

      printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);

      /* enable workarounds, unless strict ACPI spec. compliance */
      if (!acpi_strict)
            acpi_gbl_enable_interpreter_slack = TRUE;

      acpi_gbl_permanent_mmap = 1;

      status = acpi_reallocate_root_table();
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to reallocate ACPI tables\n");
            goto error0;
      }

      status = acpi_initialize_subsystem();
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to initialize the ACPI Interpreter\n");
            goto error0;
      }

      status = acpi_load_tables();
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to load the System Description Tables\n");
            goto error0;
      }

#ifdef CONFIG_X86
      if (!acpi_ioapic) {
            extern u8 acpi_sci_flags;

            /* compatible (0) means level (3) */
            if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
                  acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
                  acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
            }
            /* Set PIC-mode SCI trigger type */
            acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
                               (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
      } else {
            extern int acpi_sci_override_gsi;
            /*
             * now that acpi_gbl_FADT is initialized,
             * update it with result from INT_SRC_OVR parsing
             */
            acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
      }
#endif

      status =
          acpi_enable_subsystem(~
                          (ACPI_NO_HARDWARE_INIT |
                           ACPI_NO_ACPI_ENABLE));
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
            goto error0;
      }

      return;

      error0:
      disable_acpi();
      return;
}

static int __init acpi_bus_init(void)
{
      int result = 0;
      acpi_status status = AE_OK;
      extern acpi_status acpi_os_initialize1(void);


      status = acpi_os_initialize1();

      status =
          acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to start the ACPI Interpreter\n");
            goto error1;
      }

      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to initialize ACPI OS objects\n");
            goto error1;
      }
#ifdef CONFIG_ACPI_EC
      /*
       * ACPI 2.0 requires the EC driver to be loaded and work before
       * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
       * is called).
       *
       * This is accomplished by looking for the ECDT table, and getting
       * the EC parameters out of that.
       */
      status = acpi_ec_ecdt_probe();
      /* Ignore result. Not having an ECDT is not fatal. */
#endif

      status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
            goto error1;
      }

      printk(KERN_INFO PREFIX "Interpreter enabled\n");

      /* Initialize sleep structures */
      acpi_sleep_init();

      /*
       * Get the system interrupt model and evaluate \_PIC.
       */
      result = acpi_bus_init_irq();
      if (result)
            goto error1;

      /*
       * Register the for all standard device notifications.
       */
      status =
          acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
                              &acpi_bus_notify, NULL);
      if (ACPI_FAILURE(status)) {
            printk(KERN_ERR PREFIX
                   "Unable to register for device notifications\n");
            goto error1;
      }

      /*
       * Create the top ACPI proc directory
       */
      acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

      return 0;

      /* Mimic structured exception handling */
      error1:
      acpi_terminate();
      return -ENODEV;
}

decl_subsys(acpi, NULL, NULL);

static int __init acpi_init(void)
{
      int result = 0;


      if (acpi_disabled) {
            printk(KERN_INFO PREFIX "Interpreter disabled.\n");
            return -ENODEV;
      }

      result = firmware_register(&acpi_subsys);
      if (result < 0)
            printk(KERN_WARNING "%s: firmware_register error: %d\n",
                  __FUNCTION__, result);

      result = acpi_bus_init();

      if (!result) {
            if (!(pm_flags & PM_APM))
                  pm_flags |= PM_ACPI;
            else {
                  printk(KERN_INFO PREFIX
                         "APM is already active, exiting\n");
                  disable_acpi();
                  result = -ENODEV;
            }
      } else
            disable_acpi();

      return result;
}

subsys_initcall(acpi_init);

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