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authorBjorn Helgaas <bjorn.helgaas@hp.com>2009-09-21 19:29:35 +0000
committerLen Brown <len.brown@intel.com>2009-09-25 14:24:28 -0400
commit5c478f499c9e6a3ac542c940f7b434686f4967a5 (patch)
treee04a3e3adfc1ef854a865fa345ffbd3d488b33d0 /drivers/acpi/scan.c
parent77c24888b7693eecee904308e0ee51f7f1f564df (diff)
downloadlinux-linaro-android-5c478f499c9e6a3ac542c940f7b434686f4967a5.tar.gz
ACPI: add acpi_bus_get_parent() and remove "parent" arguments
This patch adds acpi_bus_get_parent(), which ascends the namespace until it finds a parent with an acpi_device. Then we use acpi_bus_get_parent() in acpi_add_single_object(), so callers don't have to figure out or keep track of the parent acpi_device. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c50
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index f2e283426be..f205b368894 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -662,6 +662,33 @@ EXPORT_SYMBOL(acpi_bus_unregister_driver);
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
+static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
+{
+ acpi_status status;
+ int ret;
+ struct acpi_device *device;
+
+ /*
+ * Fixed hardware devices do not appear in the namespace and do not
+ * have handles, but we fabricate acpi_devices for them, so we have
+ * to deal with them specially.
+ */
+ if (handle == NULL)
+ return acpi_root;
+
+ do {
+ status = acpi_get_parent(handle, &handle);
+ if (status == AE_NULL_ENTRY)
+ return NULL;
+ if (ACPI_FAILURE(status))
+ return acpi_root;
+
+ ret = acpi_bus_get_device(handle, &device);
+ if (ret == 0)
+ return device;
+ } while (1);
+}
+
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
@@ -1217,10 +1244,9 @@ static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
return 0;
}
-static int
-acpi_add_single_object(struct acpi_device **child,
- struct acpi_device *parent, acpi_handle handle, int type,
- struct acpi_bus_ops *ops)
+static int acpi_add_single_object(struct acpi_device **child,
+ acpi_handle handle, int type,
+ struct acpi_bus_ops *ops)
{
int result;
struct acpi_device *device;
@@ -1234,7 +1260,7 @@ acpi_add_single_object(struct acpi_device **child,
device->device_type = type;
device->handle = handle;
- device->parent = parent;
+ device->parent = acpi_bus_get_parent(handle);
device->bus_ops = *ops; /* workround for not call .start */
acpi_device_get_busid(device);
@@ -1434,8 +1460,8 @@ static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
}
if (ops->acpi_op_add)
- status = acpi_add_single_object(&child, parent,
- chandle, type, ops);
+ status = acpi_add_single_object(&child, chandle, type,
+ ops);
else
status = acpi_bus_get_device(chandle, &child);
@@ -1488,7 +1514,7 @@ acpi_bus_add(struct acpi_device **child,
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
- result = acpi_add_single_object(child, parent, handle, type, &ops);
+ result = acpi_add_single_object(child, handle, type, &ops);
if (!result)
result = acpi_bus_scan(*child, &ops);
@@ -1584,15 +1610,13 @@ static int acpi_bus_scan_fixed(void)
* Enumerate all fixed-feature devices.
*/
if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
- result = acpi_add_single_object(&device, acpi_root,
- NULL,
+ result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_POWER_BUTTON,
&ops);
}
if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
- result = acpi_add_single_object(&device, acpi_root,
- NULL,
+ result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_SLEEP_BUTTON,
&ops);
}
@@ -1618,7 +1642,7 @@ int __init acpi_scan_init(void)
/*
* Create the root device in the bus's device tree
*/
- result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
+ result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT,
ACPI_BUS_TYPE_SYSTEM, &ops);
if (result)
goto Done;