drivers/acpi/glue.c

   1 /*
   2  * Link physical devices with ACPI devices support
   3  *
   4  * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
   5  * Copyright (c) 2005 Intel Corp.
   6  *
   7  * This file is released under the GPLv2.
   8  */
   9 #include <linux/export.h>
  10 #include <linux/init.h>
  11 #include <linux/list.h>
  12 #include <linux/device.h>
  13 #include <linux/slab.h>
  14 #include <linux/rwsem.h>
  15 #include <linux/acpi.h>
  16
  17 #include "internal.h"
  18
  19 #define ACPI_GLUE_DEBUG 0
  20 #if ACPI_GLUE_DEBUG
  21 #define DBG(fmt, ...)                                           \
  22         printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
  23 #else
  24 #define DBG(fmt, ...)                                           \
  25 do {                                                            \
  26         if (0)                                                  \
  27                 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__);   \
  28 } while (0)
  29 #endif
  30 static LIST_HEAD(bus_type_list);
  31 static DECLARE_RWSEM(bus_type_sem);
  32
  33 #define PHYSICAL_NODE_STRING "physical_node"
  34
  35 int register_acpi_bus_type(struct acpi_bus_type *type)
  36 {
  37         if (acpi_disabled)
  38                 return -ENODEV;
  39         if (type && type->match && type->find_device) {
  40                 down_write(&bus_type_sem);
  41                 list_add_tail(&type->list, &bus_type_list);
  42                 up_write(&bus_type_sem);
  43                 printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
  44                 return 0;
  45         }
  46         return -ENODEV;
  47 }
  48 EXPORT_SYMBOL_GPL(register_acpi_bus_type);
  49
  50 int unregister_acpi_bus_type(struct acpi_bus_type *type)
  51 {
  52         if (acpi_disabled)
  53                 return 0;
  54         if (type) {
  55                 down_write(&bus_type_sem);
  56                 list_del_init(&type->list);
  57                 up_write(&bus_type_sem);
  58                 printk(KERN_INFO PREFIX "bus type %s unregistered\n",
  59                        type->name);
  60                 return 0;
  61         }
  62         return -ENODEV;
  63 }
  64 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
  65
  66 static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
  67 {
  68         struct acpi_bus_type *tmp, *ret = NULL;
  69
  70         down_read(&bus_type_sem);
  71         list_for_each_entry(tmp, &bus_type_list, list) {
  72                 if (tmp->match(dev)) {
  73                         ret = tmp;
  74                         break;
  75                 }
  76         }
  77         up_read(&bus_type_sem);
  78         return ret;
  79 }
  80
  81 static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
  82                                       void *addr_p, void **ret_p)
  83 {
  84         unsigned long long addr, sta;
  85         acpi_status status;
  86
  87         status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
  88         if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
  89                 *ret_p = handle;
  90                 status = acpi_bus_get_status_handle(handle, &sta);
  91                 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED))
  92                         return AE_CTRL_TERMINATE;
  93         }
  94         return AE_OK;
  95 }
  96
  97 acpi_handle acpi_get_child(acpi_handle parent, u64 address)
  98 {
  99         void *ret = NULL;
 100
 101         if (!parent)
 102                 return NULL;
 103
 104         acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
 105                             do_acpi_find_child, &address, &ret);
 106         return (acpi_handle)ret;
 107 }
 108 EXPORT_SYMBOL(acpi_get_child);
 109
 110 int acpi_bind_one(struct device *dev, acpi_handle handle)
 111 {
 112         struct acpi_device *acpi_dev;
 113         acpi_status status;
 114         struct acpi_device_physical_node *physical_node, *pn;
 115         char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
 116         int retval = -EINVAL;
 117
 118         if (ACPI_HANDLE(dev)) {
 119                 if (handle) {
 120                         dev_warn(dev, "ACPI handle is already set\n");
 121                         return -EINVAL;
 122                 } else {
 123                         handle = ACPI_HANDLE(dev);
 124                 }
 125         }
 126         if (!handle)
 127                 return -EINVAL;
 128
 129         get_device(dev);
 130         status = acpi_bus_get_device(handle, &acpi_dev);
 131         if (ACPI_FAILURE(status))
 132                 goto err;
 133
 134         physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
 135         if (!physical_node) {
 136                 retval = -ENOMEM;
 137                 goto err;
 138         }
 139
 140         mutex_lock(&acpi_dev->physical_node_lock);
 141
 142         /* Sanity check. */
 143         list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
 144                 if (pn->dev == dev) {
 145                         dev_warn(dev, "Already associated with ACPI node\n");
 146                         goto err_free;
 147                 }
 148
 149         /* allocate physical node id according to physical_node_id_bitmap */
 150         physical_node->node_id =
 151                 find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
 152                 ACPI_MAX_PHYSICAL_NODE);
 153         if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
 154                 retval = -ENOSPC;
 155                 goto err_free;
 156         }
 157
 158         set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
 159         physical_node->dev = dev;
 160         list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
 161         acpi_dev->physical_node_count++;
 162
 163         mutex_unlock(&acpi_dev->physical_node_lock);
 164
 165         if (!ACPI_HANDLE(dev))
 166                 ACPI_HANDLE_SET(dev, acpi_dev->handle);
 167
 168         if (!physical_node->node_id)
 169                 strcpy(physical_node_name, PHYSICAL_NODE_STRING);
 170         else
 171                 sprintf(physical_node_name,
 172                         "physical_node%d", physical_node->node_id);
 173         retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
 174                         physical_node_name);
 175         retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
 176                 "firmware_node");
 177
 178         if (acpi_dev->wakeup.flags.valid)
 179                 device_set_wakeup_capable(dev, true);
 180
 181         return 0;
 182
 183  err:
 184         ACPI_HANDLE_SET(dev, NULL);
 185         put_device(dev);
 186         return retval;
 187
 188  err_free:
 189         mutex_unlock(&acpi_dev->physical_node_lock);
 190         kfree(physical_node);
 191         goto err;
 192 }
 193 EXPORT_SYMBOL_GPL(acpi_bind_one);
 194
 195 int acpi_unbind_one(struct device *dev)
 196 {
 197         struct acpi_device_physical_node *entry;
 198         struct acpi_device *acpi_dev;
 199         acpi_status status;
 200         struct list_head *node, *next;
 201
 202         if (!ACPI_HANDLE(dev))
 203                 return 0;
 204
 205         status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
 206         if (ACPI_FAILURE(status))
 207                 goto err;
 208
 209         mutex_lock(&acpi_dev->physical_node_lock);
 210         list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
 211                 char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
 212
 213                 entry = list_entry(node, struct acpi_device_physical_node,
 214                         node);
 215                 if (entry->dev != dev)
 216                         continue;
 217
 218                 list_del(node);
 219                 clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
 220
 221                 acpi_dev->physical_node_count--;
 222
 223                 if (!entry->node_id)
 224                         strcpy(physical_node_name, PHYSICAL_NODE_STRING);
 225                 else
 226                         sprintf(physical_node_name,
 227                                 "physical_node%d", entry->node_id);
 228
 229                 sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
 230                 sysfs_remove_link(&dev->kobj, "firmware_node");
 231                 ACPI_HANDLE_SET(dev, NULL);
 232                 /* acpi_bind_one increase refcnt by one */
 233                 put_device(dev);
 234                 kfree(entry);
 235         }
 236         mutex_unlock(&acpi_dev->physical_node_lock);
 237
 238         return 0;
 239
 240 err:
 241         dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
 242         return -EINVAL;
 243 }
 244 EXPORT_SYMBOL_GPL(acpi_unbind_one);
 245
 246 static int acpi_platform_notify(struct device *dev)
 247 {
 248         struct acpi_bus_type *type = acpi_get_bus_type(dev);
 249         acpi_handle handle;
 250         int ret;
 251
 252         ret = acpi_bind_one(dev, NULL);
 253         if (ret && type) {
 254                 ret = type->find_device(dev, &handle);
 255                 if (ret) {
 256                         DBG("Unable to get handle for %s\n", dev_name(dev));
 257                         goto out;
 258                 }
 259                 ret = acpi_bind_one(dev, handle);
 260                 if (ret)
 261                         goto out;
 262         }
 263
 264         if (type && type->setup)
 265                 type->setup(dev);
 266
 267  out:
 268 #if ACPI_GLUE_DEBUG
 269         if (!ret) {
 270                 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 271
 272                 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
 273                 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
 274                 kfree(buffer.pointer);
 275         } else
 276                 DBG("Device %s -> No ACPI support\n", dev_name(dev));
 277 #endif
 278
 279         return ret;
 280 }
 281
 282 static int acpi_platform_notify_remove(struct device *dev)
 283 {
 284         struct acpi_bus_type *type;
 285
 286         type = acpi_get_bus_type(dev);
 287         if (type && type->cleanup)
 288                 type->cleanup(dev);
 289
 290         acpi_unbind_one(dev);
 291         return 0;
 292 }
 293
 294 int __init init_acpi_device_notify(void)
 295 {
 296         if (platform_notify || platform_notify_remove) {
 297                 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
 298                 return 0;
 299         }
 300         platform_notify = acpi_platform_notify;
 301         platform_notify_remove = acpi_platform_notify_remove;
 302         return 0;
 303 }