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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         ACPI_FUNCTION_TRACE("is_device_present");
  77
  78         status = acpi_get_handle(handle, "_STA", &temp);
  79         if (ACPI_FAILURE(status))
  80                 return_VALUE(1);        /* _STA not found, assmue device present */
  81
  82         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  83         if (ACPI_FAILURE(status))
  84                 return_VALUE(0);        /* Firmware error */
  85
  86         return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
  87 }
  88
  89 /*******************************************************************/
  90 static int acpi_container_add(struct acpi_device *device)
  91 {
  92         struct acpi_container *container;
  93
  94         ACPI_FUNCTION_TRACE("acpi_container_add");
  95
  96         if (!device) {
  97                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
  98                 return_VALUE(-EINVAL);
  99         }
 100
 101         container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
 102         if (!container)
 103                 return_VALUE(-ENOMEM);
 104
 105         memset(container, 0, sizeof(struct acpi_container));
 106         container->handle = device->handle;
 107         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 108         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
 109         acpi_driver_data(device) = container;
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
 112                           acpi_device_name(device), acpi_device_bid(device)));
 113
 114         return_VALUE(0);
 115 }
 116
 117 static int acpi_container_remove(struct acpi_device *device, int type)
 118 {
 119         acpi_status status = AE_OK;
 120         struct acpi_container *pc = NULL;
 121
 122         pc = (struct acpi_container *)acpi_driver_data(device);
 123         kfree(pc);
 124         return status;
 125 }
 126
 127 static int container_device_add(struct acpi_device **device, acpi_handle handle)
 128 {
 129         acpi_handle phandle;
 130         struct acpi_device *pdev;
 131         int result;
 132
 133         ACPI_FUNCTION_TRACE("container_device_add");
 134
 135         if (acpi_get_parent(handle, &phandle)) {
 136                 return_VALUE(-ENODEV);
 137         }
 138
 139         if (acpi_bus_get_device(phandle, &pdev)) {
 140                 return_VALUE(-ENODEV);
 141         }
 142
 143         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
 144                 return_VALUE(-ENODEV);
 145         }
 146
 147         result = acpi_bus_start(*device);
 148
 149         return_VALUE(result);
 150 }
 151
 152 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 153 {
 154         struct acpi_device *device = NULL;
 155         int result;
 156         int present;
 157         acpi_status status;
 158
 159         ACPI_FUNCTION_TRACE("container_notify_cb");
 160
 161         present = is_device_present(handle);
 162
 163         switch (type) {
 164         case ACPI_NOTIFY_BUS_CHECK:
 165                 /* Fall through */
 166         case ACPI_NOTIFY_DEVICE_CHECK:
 167                 printk("Container driver received %s event\n",
 168                        (type == ACPI_NOTIFY_BUS_CHECK) ?
 169                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 170                 status = acpi_bus_get_device(handle, &device);
 171                 if (present) {
 172                         if (ACPI_FAILURE(status) || !device) {
 173                                 result = container_device_add(&device, handle);
 174                                 if (!result)
 175                                         kobject_hotplug(&device->kobj,
 176                                                         KOBJ_ONLINE);
 177                                 else
 178                                         printk("Failed to add container\n");
 179                         }
 180                 } else {
 181                         if (ACPI_SUCCESS(status)) {
 182                                 /* device exist and this is a remove request */
 183                                 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 184                         }
 185                 }
 186                 break;
 187         case ACPI_NOTIFY_EJECT_REQUEST:
 188                 if (!acpi_bus_get_device(handle, &device) && device) {
 189                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 190                 }
 191                 break;
 192         default:
 193                 break;
 194         }
 195         return_VOID;
 196 }
 197
 198 static acpi_status
 199 container_walk_namespace_cb(acpi_handle handle,
 200                             u32 lvl, void *context, void **rv)
 201 {
 202         char *hid = NULL;
 203         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 204         struct acpi_device_info *info;
 205         acpi_status status;
 206         int *action = context;
 207
 208         ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
 209
 210         status = acpi_get_object_info(handle, &buffer);
 211         if (ACPI_FAILURE(status) || !buffer.pointer) {
 212                 return_ACPI_STATUS(AE_OK);
 213         }
 214
 215         info = buffer.pointer;
 216         if (info->valid & ACPI_VALID_HID)
 217                 hid = info->hardware_id.value;
 218
 219         if (hid == NULL) {
 220                 goto end;
 221         }
 222
 223         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
 224             strcmp(hid, "PNP0A06")) {
 225                 goto end;
 226         }
 227
 228         switch (*action) {
 229         case INSTALL_NOTIFY_HANDLER:
 230                 acpi_install_notify_handler(handle,
 231                                             ACPI_SYSTEM_NOTIFY,
 232                                             container_notify_cb, NULL);
 233                 break;
 234         case UNINSTALL_NOTIFY_HANDLER:
 235                 acpi_remove_notify_handler(handle,
 236                                            ACPI_SYSTEM_NOTIFY,
 237                                            container_notify_cb);
 238                 break;
 239         default:
 240                 break;
 241         }
 242
 243       end:
 244         acpi_os_free(buffer.pointer);
 245
 246         return_ACPI_STATUS(AE_OK);
 247 }
 248
 249 static int __init acpi_container_init(void)
 250 {
 251         int result = 0;
 252         int action = INSTALL_NOTIFY_HANDLER;
 253
 254         result = acpi_bus_register_driver(&acpi_container_driver);
 255         if (result < 0) {
 256                 return (result);
 257         }
 258
 259         /* register notify handler to every container device */
 260         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 261                             ACPI_ROOT_OBJECT,
 262                             ACPI_UINT32_MAX,
 263                             container_walk_namespace_cb, &action, NULL);
 264
 265         return (0);
 266 }
 267
 268 static void __exit acpi_container_exit(void)
 269 {
 270         int action = UNINSTALL_NOTIFY_HANDLER;
 271
 272         ACPI_FUNCTION_TRACE("acpi_container_exit");
 273
 274         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 275                             ACPI_ROOT_OBJECT,
 276                             ACPI_UINT32_MAX,
 277                             container_walk_namespace_cb, &action, NULL);
 278
 279         acpi_bus_unregister_driver(&acpi_container_driver);
 280
 281         return_VOID;
 282 }
 283
 284 module_init(acpi_container_init);
 285 module_exit(acpi_container_exit);