1 files changed, 303 insertions, 0 deletions

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
new file mode 100644
index 000000000000..5a0adbf8bc04
--- /dev/null
+++ b/drivers/acpi/container.c
@@ -0,0 +1,303 @@
+/*
+ * 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_DRIVER_NAME      "ACPI container driver"
+#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                        ("acpi_container")
+
+MODULE_AUTHOR("Anil S Keshavamurthy");
+MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+#define ACPI_STA_PRESENT                (0x00000001)
+
+static int acpi_container_add(struct acpi_device *device);
+static int acpi_container_remove(struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_container_driver = {
+        .name =         ACPI_CONTAINER_DRIVER_NAME,
+        .class =        ACPI_CONTAINER_CLASS,
+        .ids =          "ACPI0004,PNP0A05,PNP0A06",
+        .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;
+
+        ACPI_FUNCTION_TRACE("is_device_present");
+
+        status = acpi_get_handle(handle, "_STA", &temp);
+        if (ACPI_FAILURE(status))
+                return_VALUE(1); /* _STA not found, assmue device present */
+
+        status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+        if (ACPI_FAILURE(status))
+                return_VALUE(0); /* Firmware error */
+
+        return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
+}
+
+/*******************************************************************/
+static int
+acpi_container_add(struct acpi_device *device)
+{
+        struct acpi_container *container;
+
+        ACPI_FUNCTION_TRACE("acpi_container_add");
+
+        if (!device) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
+                return_VALUE(-EINVAL);
+        }
+
+        container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
+        if(!container)
+                return_VALUE(-ENOMEM);
+        
+        memset(container, 0, sizeof(struct acpi_container));
+        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_VALUE(0);
+}
+
+static int
+acpi_container_remove(struct acpi_device *device, int type)
+{
+        acpi_status             status = AE_OK;
+        struct acpi_container   *pc = NULL;
+        pc = (struct acpi_container*) acpi_driver_data(device);
+
+        if (pc)
+                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;
+
+        ACPI_FUNCTION_TRACE("container_device_add");
+
+        if (acpi_get_parent(handle, &phandle)) {
+                return_VALUE(-ENODEV);
+        }
+
+        if (acpi_bus_get_device(phandle, &pdev)) {
+                return_VALUE(-ENODEV);
+        }
+
+        if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
+                return_VALUE(-ENODEV);
+        }
+
+        result = acpi_bus_scan(*device);
+
+        return_VALUE(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;
+
+        ACPI_FUNCTION_TRACE("container_notify_cb");
+
+        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_hotplug(&device->kobj,
+                                                        KOBJ_ONLINE);
+                                else
+                                        printk("Failed to add container\n");
+                        }
+                } else {
+                        if (ACPI_SUCCESS(status)) {
+                                /* device exist and this is a remove request */
+                                kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+                        }
+                }
+                break;
+        case ACPI_NOTIFY_EJECT_REQUEST:
+                if (!acpi_bus_get_device(handle, &device) && device) {
+                        kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+                }
+                break;
+        default:
+                break;
+        }
+        return_VOID;
+}
+
+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;
+
+        ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
+
+        status = acpi_get_object_info(handle, &buffer);
+        if (ACPI_FAILURE(status) || !buffer.pointer) {
+                return_ACPI_STATUS(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:
+        acpi_os_free(buffer.pointer);
+
+        return_ACPI_STATUS(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_FUNCTION_TRACE("acpi_container_exit");
+
+        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_VOID;
+}
+
+module_init(acpi_container_init);
+module_exit(acpi_container_exit);