Logo Search packages:      
Sourcecode: linux version File versions  Download package

container.c

/*
 * acpi_container.c  - ACPI Generic Container Driver
 * ($Revision: )
 *
 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
 * Copyright (C) 2004 Intel Corp.
 * Copyright (C) 2004 FUJITSU LIMITED
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/container.h>

#define ACPI_CONTAINER_DEVICE_NAME  "ACPI container device"
#define ACPI_CONTAINER_CLASS        "container"

#define INSTALL_NOTIFY_HANDLER            1
#define UNINSTALL_NOTIFY_HANDLER    2

#define ACPI_CONTAINER_COMPONENT    0x01000000
#define _COMPONENT                  ACPI_CONTAINER_COMPONENT
ACPI_MODULE_NAME("container");

MODULE_AUTHOR("Anil S Keshavamurthy");
MODULE_DESCRIPTION("ACPI container driver");
MODULE_LICENSE("GPL");

static int acpi_container_add(struct acpi_device *device);
static int acpi_container_remove(struct acpi_device *device, int type);

static const struct acpi_device_id container_device_ids[] = {
      {"ACPI0004", 0},
      {"PNP0A05", 0},
      {"PNP0A06", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, container_device_ids);

static struct acpi_driver acpi_container_driver = {
      .name = "container",
      .class = ACPI_CONTAINER_CLASS,
      .ids = container_device_ids,
      .ops = {
            .add = acpi_container_add,
            .remove = acpi_container_remove,
            },
};

/*******************************************************************/

static int is_device_present(acpi_handle handle)
{
      acpi_handle temp;
      acpi_status status;
      unsigned long sta;


      status = acpi_get_handle(handle, "_STA", &temp);
      if (ACPI_FAILURE(status))
            return 1;   /* _STA not found, assume device present */

      status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
      if (ACPI_FAILURE(status))
            return 0;   /* Firmware error */

      return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
}

/*******************************************************************/
static int acpi_container_add(struct acpi_device *device)
{
      struct acpi_container *container;


      if (!device) {
            printk(KERN_ERR PREFIX "device is NULL\n");
            return -EINVAL;
      }

      container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
      if (!container)
            return -ENOMEM;

      container->handle = device->handle;
      strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
      strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
      acpi_driver_data(device) = container;

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
                    acpi_device_name(device), acpi_device_bid(device)));

      return 0;
}

static int acpi_container_remove(struct acpi_device *device, int type)
{
      acpi_status status = AE_OK;
      struct acpi_container *pc = NULL;

      pc = acpi_driver_data(device);
      kfree(pc);
      return status;
}

static int container_device_add(struct acpi_device **device, acpi_handle handle)
{
      acpi_handle phandle;
      struct acpi_device *pdev;
      int result;


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

      if (acpi_bus_get_device(phandle, &pdev)) {
            return -ENODEV;
      }

      if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
            return -ENODEV;
      }

      result = acpi_bus_start(*device);

      return result;
}

static void container_notify_cb(acpi_handle handle, u32 type, void *context)
{
      struct acpi_device *device = NULL;
      int result;
      int present;
      acpi_status status;


      present = is_device_present(handle);

      switch (type) {
      case ACPI_NOTIFY_BUS_CHECK:
            /* Fall through */
      case ACPI_NOTIFY_DEVICE_CHECK:
            printk("Container driver received %s event\n",
                   (type == ACPI_NOTIFY_BUS_CHECK) ?
                   "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
            status = acpi_bus_get_device(handle, &device);
            if (present) {
                  if (ACPI_FAILURE(status) || !device) {
                        result = container_device_add(&device, handle);
                        if (!result)
                              kobject_uevent(&device->dev.kobj,
                                           KOBJ_ONLINE);
                        else
                              printk("Failed to add container\n");
                  }
            } else {
                  if (ACPI_SUCCESS(status)) {
                        /* device exist and this is a remove request */
                        kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
                  }
            }
            break;
      case ACPI_NOTIFY_EJECT_REQUEST:
            if (!acpi_bus_get_device(handle, &device) && device) {
                  kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
            }
            break;
      default:
            break;
      }
      return;
}

static acpi_status
container_walk_namespace_cb(acpi_handle handle,
                      u32 lvl, void *context, void **rv)
{
      char *hid = NULL;
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
      struct acpi_device_info *info;
      acpi_status status;
      int *action = context;


      status = acpi_get_object_info(handle, &buffer);
      if (ACPI_FAILURE(status) || !buffer.pointer) {
            return AE_OK;
      }

      info = buffer.pointer;
      if (info->valid & ACPI_VALID_HID)
            hid = info->hardware_id.value;

      if (hid == NULL) {
            goto end;
      }

      if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
          strcmp(hid, "PNP0A06")) {
            goto end;
      }

      switch (*action) {
      case INSTALL_NOTIFY_HANDLER:
            acpi_install_notify_handler(handle,
                                  ACPI_SYSTEM_NOTIFY,
                                  container_notify_cb, NULL);
            break;
      case UNINSTALL_NOTIFY_HANDLER:
            acpi_remove_notify_handler(handle,
                                 ACPI_SYSTEM_NOTIFY,
                                 container_notify_cb);
            break;
      default:
            break;
      }

      end:
      kfree(buffer.pointer);

      return AE_OK;
}

static int __init acpi_container_init(void)
{
      int result = 0;
      int action = INSTALL_NOTIFY_HANDLER;

      result = acpi_bus_register_driver(&acpi_container_driver);
      if (result < 0) {
            return (result);
      }

      /* register notify handler to every container device */
      acpi_walk_namespace(ACPI_TYPE_DEVICE,
                      ACPI_ROOT_OBJECT,
                      ACPI_UINT32_MAX,
                      container_walk_namespace_cb, &action, NULL);

      return (0);
}

static void __exit acpi_container_exit(void)
{
      int action = UNINSTALL_NOTIFY_HANDLER;


      acpi_walk_namespace(ACPI_TYPE_DEVICE,
                      ACPI_ROOT_OBJECT,
                      ACPI_UINT32_MAX,
                      container_walk_namespace_cb, &action, NULL);

      acpi_bus_unregister_driver(&acpi_container_driver);

      return;
}

module_init(acpi_container_init);
module_exit(acpi_container_exit);

Generated by  Doxygen 1.6.0   Back to index