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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 static int is_device_present(acpi_handle handle)
  71 {
  72         acpi_handle temp;
  73         acpi_status status;
  74         unsigned long sta;
  75
  76
  77         status = acpi_get_handle(handle, "_STA", &temp);
  78         if (ACPI_FAILURE(status))
  79                 return 1;       /* _STA not found, assmue device present */
  80
  81         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  82         if (ACPI_FAILURE(status))
  83                 return 0;       /* Firmware error */
  84
  85         return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
  86 }
  87
  88 /*******************************************************************/
  89 static int acpi_container_add(struct acpi_device *device)
  90 {
  91         struct acpi_container *container;
  92
  93
  94         if (!device) {
  95                 printk(KERN_ERR PREFIX "device is NULL\n");
  96                 return -EINVAL;
  97         }
  98
  99         container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
 100         if (!container)
 101                 return -ENOMEM;
 102
 103         memset(container, 0, sizeof(struct acpi_container));
 104         container->handle = device->handle;
 105         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 106         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
 107         acpi_driver_data(device) = container;
 108
 109         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
 110                           acpi_device_name(device), acpi_device_bid(device)));
 111
 112         return 0;
 113 }
 114
 115 static int acpi_container_remove(struct acpi_device *device, int type)
 116 {
 117         acpi_status status = AE_OK;
 118         struct acpi_container *pc = NULL;
 119
 120         pc = (struct acpi_container *)acpi_driver_data(device);
 121         kfree(pc);
 122         return status;
 123 }
 124
 125 static int container_device_add(struct acpi_device **device, acpi_handle handle)
 126 {
 127         acpi_handle phandle;
 128         struct acpi_device *pdev;
 129         int result;
 130
 131
 132         if (acpi_get_parent(handle, &phandle)) {
 133                 return -ENODEV;
 134         }
 135
 136         if (acpi_bus_get_device(phandle, &pdev)) {
 137                 return -ENODEV;
 138         }
 139
 140         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
 141                 return -ENODEV;
 142         }
 143
 144         result = acpi_bus_start(*device);
 145
 146         return result;
 147 }
 148
 149 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 150 {
 151         struct acpi_device *device = NULL;
 152         int result;
 153         int present;
 154         acpi_status status;
 155
 156
 157         present = is_device_present(handle);
 158
 159         switch (type) {
 160         case ACPI_NOTIFY_BUS_CHECK:
 161                 /* Fall through */
 162         case ACPI_NOTIFY_DEVICE_CHECK:
 163                 printk("Container driver received %s event\n",
 164                        (type == ACPI_NOTIFY_BUS_CHECK) ?
 165                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 166                 status = acpi_bus_get_device(handle, &device);
 167                 if (present) {
 168                         if (ACPI_FAILURE(status) || !device) {
 169                                 result = container_device_add(&device, handle);
 170                                 if (!result)
 171                                         kobject_uevent(&device->kobj,
 172                                                        KOBJ_ONLINE);
 173                                 else
 174                                         printk("Failed to add container\n");
 175                         }
 176                 } else {
 177                         if (ACPI_SUCCESS(status)) {
 178                                 /* device exist and this is a remove request */
 179                                 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 180                         }
 181                 }
 182                 break;
 183         case ACPI_NOTIFY_EJECT_REQUEST:
 184                 if (!acpi_bus_get_device(handle, &device) && device) {
 185                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 186                 }
 187                 break;
 188         default:
 189                 break;
 190         }
 191         return;
 192 }
 193
 194 static acpi_status
 195 container_walk_namespace_cb(acpi_handle handle,
 196                             u32 lvl, void *context, void **rv)
 197 {
 198         char *hid = NULL;
 199         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 200         struct acpi_device_info *info;
 201         acpi_status status;
 202         int *action = context;
 203
 204
 205         status = acpi_get_object_info(handle, &buffer);
 206         if (ACPI_FAILURE(status) || !buffer.pointer) {
 207                 return AE_OK;
 208         }
 209
 210         info = buffer.pointer;
 211         if (info->valid & ACPI_VALID_HID)
 212                 hid = info->hardware_id.value;
 213
 214         if (hid == NULL) {
 215                 goto end;
 216         }
 217
 218         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
 219             strcmp(hid, "PNP0A06")) {
 220                 goto end;
 221         }
 222
 223         switch (*action) {
 224         case INSTALL_NOTIFY_HANDLER:
 225                 acpi_install_notify_handler(handle,
 226                                             ACPI_SYSTEM_NOTIFY,
 227                                             container_notify_cb, NULL);
 228                 break;
 229         case UNINSTALL_NOTIFY_HANDLER:
 230                 acpi_remove_notify_handler(handle,
 231                                            ACPI_SYSTEM_NOTIFY,
 232                                            container_notify_cb);
 233                 break;
 234         default:
 235                 break;
 236         }
 237
 238       end:
 239         kfree(buffer.pointer);
 240
 241         return AE_OK;
 242 }
 243
 244 static int __init acpi_container_init(void)
 245 {
 246         int result = 0;
 247         int action = INSTALL_NOTIFY_HANDLER;
 248
 249         result = acpi_bus_register_driver(&acpi_container_driver);
 250         if (result < 0) {
 251                 return (result);
 252         }
 253
 254         /* register notify handler to every container device */
 255         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 256                             ACPI_ROOT_OBJECT,
 257                             ACPI_UINT32_MAX,
 258                             container_walk_namespace_cb, &action, NULL);
 259
 260         return (0);
 261 }
 262
 263 static void __exit acpi_container_exit(void)
 264 {
 265         int action = UNINSTALL_NOTIFY_HANDLER;
 266
 267
 268         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 269                             ACPI_ROOT_OBJECT,
 270                             ACPI_UINT32_MAX,
 271                             container_walk_namespace_cb, &action, NULL);
 272
 273         acpi_bus_unregister_driver(&acpi_container_driver);
 274
 275         return;
 276 }
 277
 278 module_init(acpi_container_init);
 279 module_exit(acpi_container_exit);