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authorMika Westerberg <mika.westerberg@linux.intel.com>2012-11-10 23:16:02 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:28:02 +0100
commitb4b6cae2f36d92b31788f10816709d5290a1119a (patch)
treea8833a3a7989ad27210eae9f8bbf3b7276afe82a /drivers/acpi/acpi_platform.c
parent91e5687805885f9fceb60b95e950a3d3bdcf4764 (diff)
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ACPI / platform: use ACPI device name instead of _HID._UID
Using _UID makes the ACPI platform bus code depend on BIOS to get it right. If it doesn't we fail to create the platform device as the name should be unique. The ACPI core already makes a unique name when it first creates the ACPI device so we can use that same name as the platform device name instead of trusting that the BIOS sets the _UIDs correctly. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_platform.c')
-rw-r--r--drivers/acpi/acpi_platform.c62
1 files changed, 22 insertions, 40 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index a5a23462287d..dbb31d61e310 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -120,25 +120,6 @@ static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
return AE_OK;
}
-static acpi_status acpi_platform_get_device_uid(struct acpi_device *adev,
- int *uid)
-{
- struct acpi_device_info *info;
- acpi_status status;
-
- status = acpi_get_object_info(adev->handle, &info);
- if (ACPI_FAILURE(status))
- return status;
-
- status = AE_NOT_EXIST;
- if ((info->valid & ACPI_VALID_UID) &&
- !kstrtoint(info->unique_id.string, 0, uid))
- status = AE_OK;
-
- kfree(info);
- return status;
-}
-
/**
* acpi_create_platform_device - Create platform device for ACPI device node
* @adev: ACPI device node to create a platform device for.
@@ -156,19 +137,12 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
struct device *parent = NULL;
struct resource_info ri;
acpi_status status;
- int devid;
/* If the ACPI node already has a physical device attached, skip it. */
if (adev->physical_node_count)
return NULL;
- /* Use the UID of the device as the new platform device id if found. */
- status = acpi_platform_get_device_uid(adev, &devid);
- if (ACPI_FAILURE(status))
- devid = -1;
-
memset(&ri, 0, sizeof(ri));
-
/* First, count the resources. */
status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
acpi_platform_count_resources, &ri);
@@ -214,8 +188,8 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
}
mutex_unlock(&acpi_parent->physical_node_lock);
}
- pdev = platform_device_register_resndata(parent, acpi_device_hid(adev),
- devid, ri.res, ri.n, NULL, 0);
+ pdev = platform_device_register_resndata(parent, dev_name(&adev->dev),
+ -1, ri.res, ri.n, NULL, 0);
if (IS_ERR(pdev)) {
dev_err(&adev->dev, "platform device creation failed: %ld\n",
PTR_ERR(pdev));
@@ -245,17 +219,7 @@ static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
if (adev->physical_node_count)
return AE_OK;
- if (!strcmp(pdev->name, acpi_device_hid(adev))) {
- int devid;
-
- /* Check that both name and UID match if it exists */
- status = acpi_platform_get_device_uid(adev, &devid);
- if (ACPI_FAILURE(status))
- devid = -1;
-
- if (pdev->id != devid)
- return AE_OK;
-
+ if (!strcmp(dev_name(&pdev->dev), dev_name(&adev->dev))) {
*(acpi_handle *)return_value = handle;
return AE_CTRL_TERMINATE;
}
@@ -266,10 +230,28 @@ static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
static int acpi_platform_find_device(struct device *dev, acpi_handle *handle)
{
struct platform_device *pdev = to_platform_device(dev);
+ char *name, *tmp, *hid;
+
+ /*
+ * The platform device is named using the ACPI device name
+ * _HID:INSTANCE so we strip the INSTANCE out in order to find the
+ * correct device using its _HID.
+ */
+ name = kstrdup(dev_name(dev), GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+
+ tmp = name;
+ hid = strsep(&tmp, ":");
+ if (!hid) {
+ kfree(name);
+ return -ENODEV;
+ }
*handle = NULL;
- acpi_get_devices(pdev->name, acpi_platform_match, pdev, handle);
+ acpi_get_devices(hid, acpi_platform_match, pdev, handle);
+ kfree(name);
return *handle ? 0 : -ENODEV;
}