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   1 /*
   2  * acpi_container.c  - ACPI Generic Container Driver
   3  * ($Revision: )
   4  *
   5  * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
   6  * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
   7  * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
   8  * Copyright (C) 2004 Intel Corp.
   9  * Copyright (C) 2004 FUJITSU LIMITED
  10  *
  11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or (at
  16  *  your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful, but
  19  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  *  General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  26  *
  27  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  28  */
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/acpi.h>
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36 #include <acpi/container.h>
  37
  38 #define ACPI_CONTAINER_DRIVER_NAME      "ACPI container driver"
  39 #define ACPI_CONTAINER_DEVICE_NAME      "ACPI container device"
  40 #define ACPI_CONTAINER_CLASS            "container"
  41
  42 #define INSTALL_NOTIFY_HANDLER          1
  43 #define UNINSTALL_NOTIFY_HANDLER        2
  44
  45 #define ACPI_CONTAINER_COMPONENT        0x01000000
  46 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
  47 ACPI_MODULE_NAME                        ("acpi_container")
  48
  49 MODULE_AUTHOR("Anil S Keshavamurthy");
  50 MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
  51 MODULE_LICENSE("GPL");
  52
  53 #define ACPI_STA_PRESENT                (0x00000001)
  54
  55 static int acpi_container_add(struct acpi_device *device);
  56 static int acpi_container_remove(struct acpi_device *device, int type);
  57
  58 static struct acpi_driver acpi_container_driver = {
  59         .name =         ACPI_CONTAINER_DRIVER_NAME,
  60         .class =        ACPI_CONTAINER_CLASS,
  61         .ids =          "ACPI0004,PNP0A05,PNP0A06",
  62         .ops =          {
  63                                 .add =          acpi_container_add,
  64                                 .remove =       acpi_container_remove,
  65                         },
  66 };
  67
  68
  69 /*******************************************************************/
  70
  71 static int
  72 is_device_present(acpi_handle handle)
  73 {
  74         acpi_handle             temp;
  75         acpi_status             status;
  76         unsigned long   sta;
  77
  78         ACPI_FUNCTION_TRACE("is_device_present");
  79
  80         status = acpi_get_handle(handle, "_STA", &temp);
  81         if (ACPI_FAILURE(status))
  82                 return_VALUE(1); /* _STA not found, assmue device present */
  83
  84         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  85         if (ACPI_FAILURE(status))
  86                 return_VALUE(0); /* Firmware error */
  87
  88         return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
  89 }
  90
  91 /*******************************************************************/
  92 static int
  93 acpi_container_add(struct acpi_device *device)
  94 {
  95         struct acpi_container *container;
  96
  97         ACPI_FUNCTION_TRACE("acpi_container_add");
  98
  99         if (!device) {
 100                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
 101                 return_VALUE(-EINVAL);
 102         }
 103
 104         container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
 105         if(!container)
 106                 return_VALUE(-ENOMEM);
 107
 108         memset(container, 0, sizeof(struct acpi_container));
 109         container->handle = device->handle;
 110         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 111         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
 112         acpi_driver_data(device) = container;
 113
 114         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",       \
 115                 acpi_device_name(device), acpi_device_bid(device)));
 116
 117
 118         return_VALUE(0);
 119 }
 120
 121 static int
 122 acpi_container_remove(struct acpi_device *device, int type)
 123 {
 124         acpi_status             status = AE_OK;
 125         struct acpi_container   *pc = NULL;
 126         pc = (struct acpi_container*) acpi_driver_data(device);
 127
 128         if (pc)
 129                 kfree(pc);
 130
 131         return status;
 132 }
 133
 134
 135 static int
 136 container_device_add(struct acpi_device **device, acpi_handle handle)
 137 {
 138         acpi_handle phandle;
 139         struct acpi_device *pdev;
 140         int result;
 141
 142         ACPI_FUNCTION_TRACE("container_device_add");
 143
 144         if (acpi_get_parent(handle, &phandle)) {
 145                 return_VALUE(-ENODEV);
 146         }
 147
 148         if (acpi_bus_get_device(phandle, &pdev)) {
 149                 return_VALUE(-ENODEV);
 150         }
 151
 152         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
 153                 return_VALUE(-ENODEV);
 154         }
 155
 156         result = acpi_bus_scan(*device);
 157
 158         return_VALUE(result);
 159 }
 160
 161 static void
 162 container_notify_cb(acpi_handle handle, u32 type, void *context)
 163 {
 164         struct acpi_device              *device = NULL;
 165         int result;
 166         int present;
 167         acpi_status status;
 168
 169         ACPI_FUNCTION_TRACE("container_notify_cb");
 170
 171         present = is_device_present(handle);
 172
 173         switch (type) {
 174         case ACPI_NOTIFY_BUS_CHECK:
 175                 /* Fall through */
 176         case ACPI_NOTIFY_DEVICE_CHECK:
 177                 printk("Container driver received %s event\n",
 178                         (type == ACPI_NOTIFY_BUS_CHECK)?
 179                         "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
 180                 status = acpi_bus_get_device(handle, &device);
 181                 if (present) {
 182                         if (ACPI_FAILURE(status) || !device) {
 183                                 result = container_device_add(&device, handle);
 184                                 if (!result)
 185                                         kobject_hotplug(&device->kobj,
 186                                                         KOBJ_ONLINE);
 187                                 else
 188                                         printk("Failed to add container\n");
 189                         }
 190                 } else {
 191                         if (ACPI_SUCCESS(status)) {
 192                                 /* device exist and this is a remove request */
 193                                 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 194                         }
 195                 }
 196                 break;
 197         case ACPI_NOTIFY_EJECT_REQUEST:
 198                 if (!acpi_bus_get_device(handle, &device) && device) {
 199                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 200                 }
 201                 break;
 202         default:
 203                 break;
 204         }
 205         return_VOID;
 206 }
 207
 208 static acpi_status
 209 container_walk_namespace_cb(acpi_handle handle,
 210         u32 lvl,
 211         void *context,
 212         void **rv)
 213 {
 214         char                            *hid = NULL;
 215         struct acpi_buffer              buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 216         struct acpi_device_info         *info;
 217         acpi_status                     status;
 218         int                             *action = context;
 219
 220         ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
 221
 222         status = acpi_get_object_info(handle, &buffer);
 223         if (ACPI_FAILURE(status) || !buffer.pointer) {
 224                 return_ACPI_STATUS(AE_OK);
 225         }
 226
 227         info = buffer.pointer;
 228         if (info->valid & ACPI_VALID_HID)
 229                 hid = info->hardware_id.value;
 230
 231         if (hid == NULL) {
 232                 goto end;
 233         }
 234
 235         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
 236                         strcmp(hid, "PNP0A06")) {
 237                 goto end;
 238         }
 239
 240         switch(*action) {
 241         case INSTALL_NOTIFY_HANDLER:
 242                 acpi_install_notify_handler(handle,
 243                         ACPI_SYSTEM_NOTIFY,
 244                         container_notify_cb,
 245                         NULL);
 246                 break;
 247         case UNINSTALL_NOTIFY_HANDLER:
 248                 acpi_remove_notify_handler(handle,
 249                         ACPI_SYSTEM_NOTIFY,
 250                         container_notify_cb);
 251                 break;
 252         default:
 253                 break;
 254         }
 255
 256 end:
 257         acpi_os_free(buffer.pointer);
 258
 259         return_ACPI_STATUS(AE_OK);
 260 }
 261
 262
 263 static int __init
 264 acpi_container_init(void)
 265 {
 266         int     result = 0;
 267         int     action = INSTALL_NOTIFY_HANDLER;
 268
 269         result = acpi_bus_register_driver(&acpi_container_driver);
 270         if (result < 0) {
 271                 return(result);
 272         }
 273
 274         /* register notify handler to every container device */
 275         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 276                                      ACPI_ROOT_OBJECT,
 277                                      ACPI_UINT32_MAX,
 278                                      container_walk_namespace_cb,
 279                                      &action, NULL);
 280
 281         return(0);
 282 }
 283
 284 static void __exit
 285 acpi_container_exit(void)
 286 {
 287         int                     action = UNINSTALL_NOTIFY_HANDLER;
 288
 289         ACPI_FUNCTION_TRACE("acpi_container_exit");
 290
 291         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 292                                      ACPI_ROOT_OBJECT,
 293                                      ACPI_UINT32_MAX,
 294                                      container_walk_namespace_cb,
 295                                      &action, NULL);
 296
 297         acpi_bus_unregister_driver(&acpi_container_driver);
 298
 299         return_VOID;
 300 }
 301
 302 module_init(acpi_container_init);
 303 module_exit(acpi_container_exit);