summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/power.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c104
1 files changed, 91 insertions, 13 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 946720a4db57..9466f56b938f 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -41,6 +41,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
+#include <linux/sysfs.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include "sleep.h"
@@ -417,24 +418,101 @@ static void acpi_power_remove_dependent(struct acpi_power_resource *resource,
}
}
-void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
+static struct attribute *attrs[] = {
+ NULL,
+};
+
+static struct attribute_group attr_groups[] = {
+ [ACPI_STATE_D0] = {
+ .name = "power_resources_D0",
+ .attrs = attrs,
+ },
+ [ACPI_STATE_D1] = {
+ .name = "power_resources_D1",
+ .attrs = attrs,
+ },
+ [ACPI_STATE_D2] = {
+ .name = "power_resources_D2",
+ .attrs = attrs,
+ },
+ [ACPI_STATE_D3_HOT] = {
+ .name = "power_resources_D3hot",
+ .attrs = attrs,
+ },
+};
+
+static void acpi_power_hide_list(struct acpi_device *adev, int state)
+{
+ struct acpi_device_power_state *ps = &adev->power.states[state];
+ struct acpi_power_resource_entry *entry;
+
+ if (list_empty(&ps->resources))
+ return;
+
+ list_for_each_entry_reverse(entry, &ps->resources, node) {
+ struct acpi_device *res_dev = &entry->resource->device;
+
+ sysfs_remove_link_from_group(&adev->dev.kobj,
+ attr_groups[state].name,
+ dev_name(&res_dev->dev));
+ }
+ sysfs_remove_group(&adev->dev.kobj, &attr_groups[state]);
+}
+
+static void acpi_power_expose_list(struct acpi_device *adev, int state)
{
- if (adev->power.flags.power_resources) {
- struct acpi_device_power_state *ps;
- struct acpi_power_resource_entry *entry;
-
- ps = &adev->power.states[ACPI_STATE_D0];
- list_for_each_entry(entry, &ps->resources, node) {
- struct acpi_power_resource *resource = entry->resource;
-
- if (add)
- acpi_power_add_dependent(resource, adev);
- else
- acpi_power_remove_dependent(resource, adev);
+ struct acpi_device_power_state *ps = &adev->power.states[state];
+ struct acpi_power_resource_entry *entry;
+ int ret;
+
+ if (list_empty(&ps->resources))
+ return;
+
+ ret = sysfs_create_group(&adev->dev.kobj, &attr_groups[state]);
+ if (ret)
+ return;
+
+ list_for_each_entry(entry, &ps->resources, node) {
+ struct acpi_device *res_dev = &entry->resource->device;
+
+ ret = sysfs_add_link_to_group(&adev->dev.kobj,
+ attr_groups[state].name,
+ &res_dev->dev.kobj,
+ dev_name(&res_dev->dev));
+ if (ret) {
+ acpi_power_hide_list(adev, state);
+ break;
}
}
}
+void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
+{
+ struct acpi_device_power_state *ps;
+ struct acpi_power_resource_entry *entry;
+ int state;
+
+ if (!adev->power.flags.power_resources)
+ return;
+
+ ps = &adev->power.states[ACPI_STATE_D0];
+ list_for_each_entry(entry, &ps->resources, node) {
+ struct acpi_power_resource *resource = entry->resource;
+
+ if (add)
+ acpi_power_add_dependent(resource, adev);
+ else
+ acpi_power_remove_dependent(resource, adev);
+ }
+
+ for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) {
+ if (add)
+ acpi_power_expose_list(adev, state);
+ else
+ acpi_power_hide_list(adev, state);
+ }
+}
+
int acpi_power_min_system_level(struct list_head *list)
{
struct acpi_power_resource_entry *entry;