linux/drivers/acpi/container.c
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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/slab.h>
  33#include <linux/types.h>
  34#include <linux/acpi.h>
  35#include <acpi/acpi_bus.h>
  36#include <acpi/acpi_drivers.h>
  37#include <acpi/container.h>
  38
  39#define PREFIX "ACPI: "
  40
  41#define ACPI_CONTAINER_DEVICE_NAME      "ACPI container device"
  42#define ACPI_CONTAINER_CLASS            "container"
  43
  44#define INSTALL_NOTIFY_HANDLER          1
  45#define UNINSTALL_NOTIFY_HANDLER        2
  46
  47#define _COMPONENT                      ACPI_CONTAINER_COMPONENT
  48ACPI_MODULE_NAME("container");
  49
  50MODULE_AUTHOR("Anil S Keshavamurthy");
  51MODULE_DESCRIPTION("ACPI container driver");
  52MODULE_LICENSE("GPL");
  53
  54static int acpi_container_add(struct acpi_device *device);
  55static int acpi_container_remove(struct acpi_device *device, int type);
  56
  57static const struct acpi_device_id container_device_ids[] = {
  58        {"ACPI0004", 0},
  59        {"PNP0A05", 0},
  60        {"PNP0A06", 0},
  61        {"", 0},
  62};
  63MODULE_DEVICE_TABLE(acpi, container_device_ids);
  64
  65static struct acpi_driver acpi_container_driver = {
  66        .name = "container",
  67        .class = ACPI_CONTAINER_CLASS,
  68        .ids = container_device_ids,
  69        .ops = {
  70                .add = acpi_container_add,
  71                .remove = acpi_container_remove,
  72                },
  73};
  74
  75/*******************************************************************/
  76
  77static int is_device_present(acpi_handle handle)
  78{
  79        acpi_handle temp;
  80        acpi_status status;
  81        unsigned long long sta;
  82
  83
  84        status = acpi_get_handle(handle, "_STA", &temp);
  85        if (ACPI_FAILURE(status))
  86                return 1;       /* _STA not found, assume device present */
  87
  88        status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  89        if (ACPI_FAILURE(status))
  90                return 0;       /* Firmware error */
  91
  92        return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
  93}
  94
  95/*******************************************************************/
  96static int acpi_container_add(struct acpi_device *device)
  97{
  98        struct acpi_container *container;
  99
 100
 101        if (!device) {
 102                printk(KERN_ERR PREFIX "device is NULL\n");
 103                return -EINVAL;
 104        }
 105
 106        container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
 107        if (!container)
 108                return -ENOMEM;
 109
 110        container->handle = device->handle;
 111        strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 112        strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
 113        device->driver_data = container;
 114
 115        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
 116                          acpi_device_name(device), acpi_device_bid(device)));
 117
 118        return 0;
 119}
 120
 121static int acpi_container_remove(struct acpi_device *device, int type)
 122{
 123        acpi_status status = AE_OK;
 124        struct acpi_container *pc = NULL;
 125
 126        pc = acpi_driver_data(device);
 127        kfree(pc);
 128        return status;
 129}
 130
 131static int container_device_add(struct acpi_device **device, acpi_handle handle)
 132{
 133        acpi_handle phandle;
 134        struct acpi_device *pdev;
 135        int result;
 136
 137
 138        if (acpi_get_parent(handle, &phandle)) {
 139                return -ENODEV;
 140        }
 141
 142        if (acpi_bus_get_device(phandle, &pdev)) {
 143                return -ENODEV;
 144        }
 145
 146        if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
 147                return -ENODEV;
 148        }
 149
 150        result = acpi_bus_start(*device);
 151
 152        return result;
 153}
 154
 155static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 156{
 157        struct acpi_device *device = NULL;
 158        int result;
 159        int present;
 160        acpi_status status;
 161        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 162
 163        switch (type) {
 164        case ACPI_NOTIFY_BUS_CHECK:
 165                /* Fall through */
 166        case ACPI_NOTIFY_DEVICE_CHECK:
 167                printk(KERN_WARNING "Container driver received %s event\n",
 168                       (type == ACPI_NOTIFY_BUS_CHECK) ?
 169                       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 170
 171                present = is_device_present(handle);
 172                status = acpi_bus_get_device(handle, &device);
 173                if (!present) {
 174                        if (ACPI_SUCCESS(status)) {
 175                                /* device exist and this is a remove request */
 176                                device->flags.eject_pending = 1;
 177                                kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 178                                return;
 179                        }
 180                        break;
 181                }
 182
 183                if (!ACPI_FAILURE(status) || device)
 184                        break;
 185
 186                result = container_device_add(&device, handle);
 187                if (result) {
 188                        printk(KERN_WARNING "Failed to add container\n");
 189                        break;
 190                }
 191
 192                kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 193                ost_code = ACPI_OST_SC_SUCCESS;
 194                break;
 195
 196        case ACPI_NOTIFY_EJECT_REQUEST:
 197                if (!acpi_bus_get_device(handle, &device) && device) {
 198                        device->flags.eject_pending = 1;
 199                        kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 200                        return;
 201                }
 202                break;
 203
 204        default:
 205                /* non-hotplug event; possibly handled by other handler */
 206                return;
 207        }
 208
 209        /* Inform firmware that the hotplug operation has completed */
 210        (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
 211        return;
 212}
 213
 214static acpi_status
 215container_walk_namespace_cb(acpi_handle handle,
 216                            u32 lvl, void *context, void **rv)
 217{
 218        char *hid = NULL;
 219        struct acpi_device_info *info;
 220        acpi_status status;
 221        int *action = context;
 222
 223        status = acpi_get_object_info(handle, &info);
 224        if (ACPI_FAILURE(status)) {
 225                return AE_OK;
 226        }
 227
 228        if (info->valid & ACPI_VALID_HID)
 229                hid = info->hardware_id.string;
 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, NULL);
 245                break;
 246        case UNINSTALL_NOTIFY_HANDLER:
 247                acpi_remove_notify_handler(handle,
 248                                           ACPI_SYSTEM_NOTIFY,
 249                                           container_notify_cb);
 250                break;
 251        default:
 252                break;
 253        }
 254
 255      end:
 256        kfree(info);
 257
 258        return AE_OK;
 259}
 260
 261static int __init acpi_container_init(void)
 262{
 263        int result = 0;
 264        int action = INSTALL_NOTIFY_HANDLER;
 265
 266        result = acpi_bus_register_driver(&acpi_container_driver);
 267        if (result < 0) {
 268                return (result);
 269        }
 270
 271        /* register notify handler to every container device */
 272        acpi_walk_namespace(ACPI_TYPE_DEVICE,
 273                            ACPI_ROOT_OBJECT,
 274                            ACPI_UINT32_MAX,
 275                            container_walk_namespace_cb, NULL, &action, NULL);
 276
 277        return (0);
 278}
 279
 280static void __exit acpi_container_exit(void)
 281{
 282        int action = UNINSTALL_NOTIFY_HANDLER;
 283
 284
 285        acpi_walk_namespace(ACPI_TYPE_DEVICE,
 286                            ACPI_ROOT_OBJECT,
 287                            ACPI_UINT32_MAX,
 288                            container_walk_namespace_cb, NULL, &action, NULL);
 289
 290        acpi_bus_unregister_driver(&acpi_container_driver);
 291
 292        return;
 293}
 294
 295module_init(acpi_container_init);
 296module_exit(acpi_container_exit);
 297
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