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path: root/drivers/acpi/glue.c
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Diffstat (limited to 'drivers/acpi/glue.c')
-rw-r--r--drivers/acpi/glue.c88
1 files changed, 52 insertions, 36 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 94672297e1b1..a22a295edb69 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -79,6 +79,9 @@ static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
return ret;
}
+#define FIND_CHILD_MIN_SCORE 1
+#define FIND_CHILD_MAX_SCORE 2
+
static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
void *not_used, void **ret_p)
{
@@ -92,14 +95,17 @@ static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
return AE_OK;
}
-static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge)
+static int do_find_child_checks(acpi_handle handle, bool is_bridge)
{
+ bool sta_present = true;
unsigned long long sta;
acpi_status status;
- status = acpi_bus_get_status_handle(handle, &sta);
- if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
- return false;
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+ if (status == AE_NOT_FOUND)
+ sta_present = false;
+ else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
+ return -ENODEV;
if (is_bridge) {
void *test = NULL;
@@ -107,16 +113,17 @@ static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge)
/* Check if this object has at least one child device. */
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
acpi_dev_present, NULL, NULL, &test);
- return !!test;
+ if (!test)
+ return -ENODEV;
}
- return true;
+ return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
}
struct find_child_context {
u64 addr;
bool is_bridge;
acpi_handle ret;
- bool ret_checked;
+ int ret_score;
};
static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
@@ -125,6 +132,7 @@ static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
struct find_child_context *context = data;
unsigned long long addr;
acpi_status status;
+ int score;
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
if (ACPI_FAILURE(status) || addr != context->addr)
@@ -144,15 +152,20 @@ static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
* its handle if so. Second, check the same for the object that we've
* just found.
*/
- if (!context->ret_checked) {
- if (acpi_extra_checks_passed(context->ret, context->is_bridge))
+ if (!context->ret_score) {
+ score = do_find_child_checks(context->ret, context->is_bridge);
+ if (score == FIND_CHILD_MAX_SCORE)
return AE_CTRL_TERMINATE;
else
- context->ret_checked = true;
+ context->ret_score = score;
}
- if (acpi_extra_checks_passed(handle, context->is_bridge)) {
+ score = do_find_child_checks(handle, context->is_bridge);
+ if (score == FIND_CHILD_MAX_SCORE) {
context->ret = handle;
return AE_CTRL_TERMINATE;
+ } else if (score > context->ret_score) {
+ context->ret = handle;
+ context->ret_score = score;
}
return AE_OK;
}
@@ -184,30 +197,28 @@ static void acpi_physnode_link_name(char *buf, unsigned int node_id)
int acpi_bind_one(struct device *dev, acpi_handle handle)
{
- struct acpi_device *acpi_dev;
- acpi_status status;
+ struct acpi_device *acpi_dev = NULL;
struct acpi_device_physical_node *physical_node, *pn;
char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
struct list_head *physnode_list;
unsigned int node_id;
int retval = -EINVAL;
- if (ACPI_HANDLE(dev)) {
+ if (ACPI_COMPANION(dev)) {
if (handle) {
- dev_warn(dev, "ACPI handle is already set\n");
+ dev_warn(dev, "ACPI companion already set\n");
return -EINVAL;
} else {
- handle = ACPI_HANDLE(dev);
+ acpi_dev = ACPI_COMPANION(dev);
}
+ } else {
+ acpi_bus_get_device(handle, &acpi_dev);
}
- if (!handle)
+ if (!acpi_dev)
return -EINVAL;
+ get_device(&acpi_dev->dev);
get_device(dev);
- status = acpi_bus_get_device(handle, &acpi_dev);
- if (ACPI_FAILURE(status))
- goto err;
-
physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
if (!physical_node) {
retval = -ENOMEM;
@@ -229,10 +240,11 @@ int acpi_bind_one(struct device *dev, acpi_handle handle)
dev_warn(dev, "Already associated with ACPI node\n");
kfree(physical_node);
- if (ACPI_HANDLE(dev) != handle)
+ if (ACPI_COMPANION(dev) != acpi_dev)
goto err;
put_device(dev);
+ put_device(&acpi_dev->dev);
return 0;
}
if (pn->node_id == node_id) {
@@ -246,8 +258,8 @@ int acpi_bind_one(struct device *dev, acpi_handle handle)
list_add(&physical_node->node, physnode_list);
acpi_dev->physical_node_count++;
- if (!ACPI_HANDLE(dev))
- ACPI_HANDLE_SET(dev, acpi_dev->handle);
+ if (!ACPI_COMPANION(dev))
+ ACPI_COMPANION_SET(dev, acpi_dev);
acpi_physnode_link_name(physical_node_name, node_id);
retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
@@ -270,27 +282,21 @@ int acpi_bind_one(struct device *dev, acpi_handle handle)
return 0;
err:
- ACPI_HANDLE_SET(dev, NULL);
+ ACPI_COMPANION_SET(dev, NULL);
put_device(dev);
+ put_device(&acpi_dev->dev);
return retval;
}
EXPORT_SYMBOL_GPL(acpi_bind_one);
int acpi_unbind_one(struct device *dev)
{
+ struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
struct acpi_device_physical_node *entry;
- struct acpi_device *acpi_dev;
- acpi_status status;
- if (!ACPI_HANDLE(dev))
+ if (!acpi_dev)
return 0;
- status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
- if (ACPI_FAILURE(status)) {
- dev_err(dev, "Oops, ACPI handle corrupt in %s()\n", __func__);
- return -EINVAL;
- }
-
mutex_lock(&acpi_dev->physical_node_lock);
list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
@@ -303,9 +309,10 @@ int acpi_unbind_one(struct device *dev)
acpi_physnode_link_name(physnode_name, entry->node_id);
sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
sysfs_remove_link(&dev->kobj, "firmware_node");
- ACPI_HANDLE_SET(dev, NULL);
- /* acpi_bind_one() increase refcnt by one. */
+ ACPI_COMPANION_SET(dev, NULL);
+ /* Drop references taken by acpi_bind_one(). */
put_device(dev);
+ put_device(&acpi_dev->dev);
kfree(entry);
break;
}
@@ -315,6 +322,15 @@ int acpi_unbind_one(struct device *dev)
}
EXPORT_SYMBOL_GPL(acpi_unbind_one);
+void acpi_preset_companion(struct device *dev, acpi_handle parent, u64 addr)
+{
+ struct acpi_device *adev;
+
+ if (!acpi_bus_get_device(acpi_get_child(parent, addr), &adev))
+ ACPI_COMPANION_SET(dev, adev);
+}
+EXPORT_SYMBOL_GPL(acpi_preset_companion);
+
static int acpi_platform_notify(struct device *dev)
{
struct acpi_bus_type *type = acpi_get_bus_type(dev);
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-24 06:52:44 +0000