summaryrefslogtreecommitdiff
path: root/drivers/acpi/power.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c730
1 files changed, 395 insertions, 335 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 6e7b9d523812..b820528a5fa3 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"
@@ -58,88 +59,121 @@ ACPI_MODULE_NAME("power");
#define ACPI_POWER_RESOURCE_STATE_ON 0x01
#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
-static int acpi_power_add(struct acpi_device *device);
-static int acpi_power_remove(struct acpi_device *device, int type);
-
-static const struct acpi_device_id power_device_ids[] = {
- {ACPI_POWER_HID, 0},
- {"", 0},
-};
-MODULE_DEVICE_TABLE(acpi, power_device_ids);
-
-#ifdef CONFIG_PM_SLEEP
-static int acpi_power_resume(struct device *dev);
-#endif
-static SIMPLE_DEV_PM_OPS(acpi_power_pm, NULL, acpi_power_resume);
-
-static struct acpi_driver acpi_power_driver = {
- .name = "power",
- .class = ACPI_POWER_CLASS,
- .ids = power_device_ids,
- .ops = {
- .add = acpi_power_add,
- .remove = acpi_power_remove,
- },
- .drv.pm = &acpi_power_pm,
-};
-
-/*
- * A power managed device
- * A device may rely on multiple power resources.
- * */
-struct acpi_power_managed_device {
- struct device *dev; /* The physical device */
- acpi_handle *handle;
-};
-
-struct acpi_power_resource_device {
- struct acpi_power_managed_device *device;
- struct acpi_power_resource_device *next;
+struct acpi_power_dependent_device {
+ struct list_head node;
+ struct acpi_device *adev;
+ struct work_struct work;
};
struct acpi_power_resource {
- struct acpi_device * device;
- acpi_bus_id name;
+ struct acpi_device device;
+ struct list_head list_node;
+ struct list_head dependent;
+ char *name;
u32 system_level;
u32 order;
unsigned int ref_count;
struct mutex resource_lock;
+};
- /* List of devices relying on this power resource */
- struct acpi_power_resource_device *devices;
- struct mutex devices_lock;
+struct acpi_power_resource_entry {
+ struct list_head node;
+ struct acpi_power_resource *resource;
};
-static struct list_head acpi_power_resource_list;
+static LIST_HEAD(acpi_power_resource_list);
+static DEFINE_MUTEX(power_resource_list_lock);
/* --------------------------------------------------------------------------
Power Resource Management
-------------------------------------------------------------------------- */
-static int
-acpi_power_get_context(acpi_handle handle,
- struct acpi_power_resource **resource)
+static inline
+struct acpi_power_resource *to_power_resource(struct acpi_device *device)
{
- int result = 0;
- struct acpi_device *device = NULL;
+ return container_of(device, struct acpi_power_resource, device);
+}
+
+static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
+{
+ struct acpi_device *device;
+ if (acpi_bus_get_device(handle, &device))
+ return NULL;
- if (!resource)
- return -ENODEV;
+ return to_power_resource(device);
+}
- result = acpi_bus_get_device(handle, &device);
- if (result) {
- printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
- return result;
- }
+static int acpi_power_resources_list_add(acpi_handle handle,
+ struct list_head *list)
+{
+ struct acpi_power_resource *resource = acpi_power_get_context(handle);
+ struct acpi_power_resource_entry *entry;
- *resource = acpi_driver_data(device);
- if (!*resource)
- return -ENODEV;
+ if (!resource || !list)
+ return -EINVAL;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ entry->resource = resource;
+ if (!list_empty(list)) {
+ struct acpi_power_resource_entry *e;
+ list_for_each_entry(e, list, node)
+ if (e->resource->order > resource->order) {
+ list_add_tail(&entry->node, &e->node);
+ return 0;
+ }
+ }
+ list_add_tail(&entry->node, list);
return 0;
}
+void acpi_power_resources_list_free(struct list_head *list)
+{
+ struct acpi_power_resource_entry *entry, *e;
+
+ list_for_each_entry_safe(entry, e, list, node) {
+ list_del(&entry->node);
+ kfree(entry);
+ }
+}
+
+int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
+ struct list_head *list)
+{
+ unsigned int i;
+ int err = 0;
+
+ for (i = start; i < package->package.count; i++) {
+ union acpi_object *element = &package->package.elements[i];
+ acpi_handle rhandle;
+
+ if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
+ err = -ENODATA;
+ break;
+ }
+ rhandle = element->reference.handle;
+ if (!rhandle) {
+ err = -ENODEV;
+ break;
+ }
+ err = acpi_add_power_resource(rhandle);
+ if (err)
+ break;
+
+ err = acpi_power_resources_list_add(rhandle, list);
+ if (err)
+ break;
+ }
+ if (err)
+ acpi_power_resources_list_free(list);
+
+ return err;
+}
+
static int acpi_power_get_state(acpi_handle handle, int *state)
{
acpi_status status = AE_OK;
@@ -167,31 +201,23 @@ static int acpi_power_get_state(acpi_handle handle, int *state)
return 0;
}
-static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
+static int acpi_power_get_list_state(struct list_head *list, int *state)
{
+ struct acpi_power_resource_entry *entry;
int cur_state;
- int i = 0;
if (!list || !state)
return -EINVAL;
/* The state of the list is 'on' IFF all resources are 'on'. */
-
- for (i = 0; i < list->count; i++) {
- struct acpi_power_resource *resource;
- acpi_handle handle = list->handles[i];
+ list_for_each_entry(entry, list, node) {
+ struct acpi_power_resource *resource = entry->resource;
+ acpi_handle handle = resource->device.handle;
int result;
- result = acpi_power_get_context(handle, &resource);
- if (result)
- return result;
-
mutex_lock(&resource->resource_lock);
-
result = acpi_power_get_state(handle, &cur_state);
-
mutex_unlock(&resource->resource_lock);
-
if (result)
return result;
@@ -203,54 +229,52 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
cur_state ? "on" : "off"));
*state = cur_state;
-
return 0;
}
-/* Resume the device when all power resources in _PR0 are on */
-static void acpi_power_on_device(struct acpi_power_managed_device *device)
+static void acpi_power_resume_dependent(struct work_struct *work)
{
- struct acpi_device *acpi_dev;
- acpi_handle handle = device->handle;
+ struct acpi_power_dependent_device *dep;
+ struct acpi_device_physical_node *pn;
+ struct acpi_device *adev;
int state;
- if (acpi_bus_get_device(handle, &acpi_dev))
+ dep = container_of(work, struct acpi_power_dependent_device, work);
+ adev = dep->adev;
+ if (acpi_power_get_inferred_state(adev, &state))
return;
- if(acpi_power_get_inferred_state(acpi_dev, &state))
+ if (state > ACPI_STATE_D0)
return;
- if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
- pm_request_resume(device->dev);
+ mutex_lock(&adev->physical_node_lock);
+
+ list_for_each_entry(pn, &adev->physical_node_list, node)
+ pm_request_resume(pn->dev);
+
+ list_for_each_entry(pn, &adev->power_dependent, node)
+ pm_request_resume(pn->dev);
+
+ mutex_unlock(&adev->physical_node_lock);
}
static int __acpi_power_on(struct acpi_power_resource *resource)
{
acpi_status status = AE_OK;
- status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
+ status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
- /* Update the power resource's _device_ power state */
- resource->device->power.state = ACPI_STATE_D0;
-
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
resource->name));
return 0;
}
-static int acpi_power_on(acpi_handle handle)
+static int acpi_power_on(struct acpi_power_resource *resource)
{
- int result = 0;
- bool resume_device = false;
- struct acpi_power_resource *resource = NULL;
- struct acpi_power_resource_device *device_list;
-
- result = acpi_power_get_context(handle, &resource);
- if (result)
- return result;
+ int result = 0;;
mutex_lock(&resource->resource_lock);
@@ -260,39 +284,38 @@ static int acpi_power_on(acpi_handle handle)
resource->name));
} else {
result = __acpi_power_on(resource);
- if (result)
+ if (result) {
resource->ref_count--;
- else
- resume_device = true;
+ } else {
+ struct acpi_power_dependent_device *dep;
+
+ list_for_each_entry(dep, &resource->dependent, node)
+ schedule_work(&dep->work);
+ }
}
mutex_unlock(&resource->resource_lock);
- if (!resume_device)
- return result;
-
- mutex_lock(&resource->devices_lock);
+ return result;
+}
- device_list = resource->devices;
- while (device_list) {
- acpi_power_on_device(device_list->device);
- device_list = device_list->next;
- }
+static int __acpi_power_off(struct acpi_power_resource *resource)
+{
+ acpi_status status;
- mutex_unlock(&resource->devices_lock);
+ status = acpi_evaluate_object(resource->device.handle, "_OFF",
+ NULL, NULL);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
- return result;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
+ resource->name));
+ return 0;
}
-static int acpi_power_off(acpi_handle handle)
+static int acpi_power_off(struct acpi_power_resource *resource)
{
int result = 0;
- acpi_status status = AE_OK;
- struct acpi_power_resource *resource = NULL;
-
- result = acpi_power_get_context(handle, &resource);
- if (result)
- return result;
mutex_lock(&resource->resource_lock);
@@ -307,19 +330,10 @@ static int acpi_power_off(acpi_handle handle)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Power resource [%s] still in use\n",
resource->name));
- goto unlock;
- }
-
- status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
- if (ACPI_FAILURE(status)) {
- result = -ENODEV;
} else {
- /* Update the power resource's _device_ power state */
- resource->device->power.state = ACPI_STATE_D3;
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Power resource [%s] turned off\n",
- resource->name));
+ result = __acpi_power_off(resource);
+ if (result)
+ resource->ref_count++;
}
unlock:
@@ -328,148 +342,202 @@ static int acpi_power_off(acpi_handle handle)
return result;
}
-static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
+static int acpi_power_off_list(struct list_head *list)
{
- int i;
+ struct acpi_power_resource_entry *entry;
+ int result = 0;
- for (i = num_res - 1; i >= 0 ; i--)
- acpi_power_off(list->handles[i]);
-}
+ list_for_each_entry_reverse(entry, list, node) {
+ result = acpi_power_off(entry->resource);
+ if (result)
+ goto err;
+ }
+ return 0;
-static void acpi_power_off_list(struct acpi_handle_list *list)
-{
- __acpi_power_off_list(list, list->count);
+ err:
+ list_for_each_entry_continue(entry, list, node)
+ acpi_power_on(entry->resource);
+
+ return result;
}
-static int acpi_power_on_list(struct acpi_handle_list *list)
+static int acpi_power_on_list(struct list_head *list)
{
+ struct acpi_power_resource_entry *entry;
int result = 0;
- int i;
- for (i = 0; i < list->count; i++) {
- result = acpi_power_on(list->handles[i]);
- if (result) {
- __acpi_power_off_list(list, i);
- break;
- }
+ list_for_each_entry(entry, list, node) {
+ result = acpi_power_on(entry->resource);
+ if (result)
+ goto err;
}
+ return 0;
+
+ err:
+ list_for_each_entry_continue_reverse(entry, list, node)
+ acpi_power_off(entry->resource);
return result;
}
-static void __acpi_power_resource_unregister_device(struct device *dev,
- acpi_handle res_handle)
+static void acpi_power_add_dependent(struct acpi_power_resource *resource,
+ struct acpi_device *adev)
{
- struct acpi_power_resource *resource = NULL;
- struct acpi_power_resource_device *prev, *curr;
+ struct acpi_power_dependent_device *dep;
- if (acpi_power_get_context(res_handle, &resource))
- return;
+ mutex_lock(&resource->resource_lock);
+
+ list_for_each_entry(dep, &resource->dependent, node)
+ if (dep->adev == adev)
+ goto out;
+
+ dep = kzalloc(sizeof(*dep), GFP_KERNEL);
+ if (!dep)
+ goto out;
+
+ dep->adev = adev;
+ INIT_WORK(&dep->work, acpi_power_resume_dependent);
+ list_add_tail(&dep->node, &resource->dependent);
- mutex_lock(&resource->devices_lock);
- prev = NULL;
- curr = resource->devices;
- while (curr) {
- if (curr->device->dev == dev) {
- if (!prev)
- resource->devices = curr->next;
- else
- prev->next = curr->next;
-
- kfree(curr);
+ out:
+ mutex_unlock(&resource->resource_lock);
+}
+
+static void acpi_power_remove_dependent(struct acpi_power_resource *resource,
+ struct acpi_device *adev)
+{
+ struct acpi_power_dependent_device *dep;
+ struct work_struct *work = NULL;
+
+ mutex_lock(&resource->resource_lock);
+
+ list_for_each_entry(dep, &resource->dependent, node)
+ if (dep->adev == adev) {
+ list_del(&dep->node);
+ work = &dep->work;
break;
}
- prev = curr;
- curr = curr->next;
+ mutex_unlock(&resource->resource_lock);
+
+ if (work) {
+ cancel_work_sync(work);
+ kfree(dep);
}
- mutex_unlock(&resource->devices_lock);
}
-/* Unlink dev from all power resources in _PR0 */
-void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle)
-{
- struct acpi_device *acpi_dev;
- struct acpi_handle_list *list;
- int i;
+static struct attribute *attrs[] = {
+ NULL,
+};
- if (!dev || !handle)
- return;
+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,
+ },
+};
- if (acpi_bus_get_device(handle, &acpi_dev))
+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 = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+ list_for_each_entry_reverse(entry, &ps->resources, node) {
+ struct acpi_device *res_dev = &entry->resource->device;
- for (i = 0; i < list->count; i++)
- __acpi_power_resource_unregister_device(dev,
- list->handles[i]);
+ 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]);
}
-EXPORT_SYMBOL_GPL(acpi_power_resource_unregister_device);
-static int __acpi_power_resource_register_device(
- struct acpi_power_managed_device *powered_device, acpi_handle handle)
+static void acpi_power_expose_list(struct acpi_device *adev, int state)
{
- struct acpi_power_resource *resource = NULL;
- struct acpi_power_resource_device *power_resource_device;
- int result;
-
- result = acpi_power_get_context(handle, &resource);
- if (result)
- return result;
+ struct acpi_device_power_state *ps = &adev->power.states[state];
+ struct acpi_power_resource_entry *entry;
+ int ret;
- power_resource_device = kzalloc(
- sizeof(*power_resource_device), GFP_KERNEL);
- if (!power_resource_device)
- return -ENOMEM;
+ if (list_empty(&ps->resources))
+ return;
- power_resource_device->device = powered_device;
+ ret = sysfs_create_group(&adev->dev.kobj, &attr_groups[state]);
+ if (ret)
+ return;
- mutex_lock(&resource->devices_lock);
- power_resource_device->next = resource->devices;
- resource->devices = power_resource_device;
- mutex_unlock(&resource->devices_lock);
+ list_for_each_entry(entry, &ps->resources, node) {
+ struct acpi_device *res_dev = &entry->resource->device;
- return 0;
+ 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;
+ }
+ }
}
-/* Link dev to all power resources in _PR0 */
-int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
+void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
{
- struct acpi_device *acpi_dev;
- struct acpi_handle_list *list;
- struct acpi_power_managed_device *powered_device;
- int i, ret;
+ struct acpi_device_power_state *ps;
+ struct acpi_power_resource_entry *entry;
+ int state;
- if (!dev || !handle)
- return -ENODEV;
+ if (!adev->power.flags.power_resources)
+ return;
- ret = acpi_bus_get_device(handle, &acpi_dev);
- if (ret || !acpi_dev->power.flags.power_resources)
- return -ENODEV;
+ ps = &adev->power.states[ACPI_STATE_D0];
+ list_for_each_entry(entry, &ps->resources, node) {
+ struct acpi_power_resource *resource = entry->resource;
- powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
- if (!powered_device)
- return -ENOMEM;
+ if (add)
+ acpi_power_add_dependent(resource, adev);
+ else
+ acpi_power_remove_dependent(resource, adev);
+ }
- powered_device->dev = dev;
- powered_device->handle = handle;
+ 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);
+ }
+}
- list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+int acpi_power_min_system_level(struct list_head *list)
+{
+ struct acpi_power_resource_entry *entry;
+ int system_level = 5;
- for (i = 0; i < list->count; i++) {
- ret = __acpi_power_resource_register_device(powered_device,
- list->handles[i]);
+ list_for_each_entry(entry, list, node) {
+ struct acpi_power_resource *resource = entry->resource;
- if (ret) {
- acpi_power_resource_unregister_device(dev, handle);
- break;
- }
+ if (system_level > resource->system_level)
+ system_level = resource->system_level;
}
-
- return ret;
+ return system_level;
}
-EXPORT_SYMBOL_GPL(acpi_power_resource_register_device);
+
+/* --------------------------------------------------------------------------
+ Device Power Management
+ -------------------------------------------------------------------------- */
/**
* acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
@@ -542,7 +610,7 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
*/
int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
{
- int i, err = 0;
+ int err = 0;
if (!dev || !dev->wakeup.flags.valid)
return -EINVAL;
@@ -552,24 +620,17 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
if (dev->wakeup.prepare_count++)
goto out;
- /* Open power resource */
- for (i = 0; i < dev->wakeup.resources.count; i++) {
- int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
- if (ret) {
- printk(KERN_ERR PREFIX "Transition power state\n");
- dev->wakeup.flags.valid = 0;
- err = -ENODEV;
- goto err_out;
- }
+ err = acpi_power_on_list(&dev->wakeup.resources);
+ if (err) {
+ dev_err(&dev->dev, "Cannot turn wakeup power resources on\n");
+ dev->wakeup.flags.valid = 0;
+ } else {
+ /*
+ * Passing 3 as the third argument below means the device may be
+ * put into arbitrary power state afterward.
+ */
+ err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
}
-
- /*
- * Passing 3 as the third argument below means the device may be placed
- * in arbitrary power state afterwards.
- */
- err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
-
- err_out:
if (err)
dev->wakeup.prepare_count = 0;
@@ -586,7 +647,7 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
*/
int acpi_disable_wakeup_device_power(struct acpi_device *dev)
{
- int i, err = 0;
+ int err = 0;
if (!dev || !dev->wakeup.flags.valid)
return -EINVAL;
@@ -607,15 +668,10 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
if (err)
goto out;
- /* Close power resource */
- for (i = 0; i < dev->wakeup.resources.count; i++) {
- int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
- if (ret) {
- printk(KERN_ERR PREFIX "Transition power state\n");
- dev->wakeup.flags.valid = 0;
- err = -ENODEV;
- goto out;
- }
+ err = acpi_power_off_list(&dev->wakeup.resources);
+ if (err) {
+ dev_err(&dev->dev, "Cannot turn wakeup power resources off\n");
+ dev->wakeup.flags.valid = 0;
}
out:
@@ -623,14 +679,9 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
return err;
}
-/* --------------------------------------------------------------------------
- Device Power Management
- -------------------------------------------------------------------------- */
-
int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
{
int result = 0;
- struct acpi_handle_list *list = NULL;
int list_state = 0;
int i = 0;
@@ -642,8 +693,9 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
* required for a given D-state are 'on'.
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
- list = &device->power.states[i].resources;
- if (list->count < 1)
+ struct list_head *list = &device->power.states[i].resources;
+
+ if (list_empty(list))
continue;
result = acpi_power_get_list_state(list, &list_state);
@@ -662,7 +714,7 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
int acpi_power_on_resources(struct acpi_device *device, int state)
{
- if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
+ if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
return -EINVAL;
return acpi_power_on_list(&device->power.states[state].resources);
@@ -675,7 +727,7 @@ int acpi_power_transition(struct acpi_device *device, int state)
if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
return -EINVAL;
- if (device->power.state == state)
+ if (device->power.state == state || !device->flags.power_manageable)
return 0;
if ((device->power.state < ACPI_STATE_D0)
@@ -703,118 +755,126 @@ int acpi_power_transition(struct acpi_device *device, int state)
return result;
}
-/* --------------------------------------------------------------------------
- Driver Interface
- -------------------------------------------------------------------------- */
+static void acpi_release_power_resource(struct device *dev)
+{
+ struct acpi_device *device = to_acpi_device(dev);
+ struct acpi_power_resource *resource;
+
+ resource = container_of(device, struct acpi_power_resource, device);
+
+ mutex_lock(&power_resource_list_lock);
+ list_del(&resource->list_node);
+ mutex_unlock(&power_resource_list_lock);
+
+ acpi_free_ids(device);
+ kfree(resource);
+}
-static int acpi_power_add(struct acpi_device *device)
+static ssize_t acpi_power_in_use_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct acpi_power_resource *resource;
+
+ resource = to_power_resource(to_acpi_device(dev));
+ return sprintf(buf, "%u\n", !!resource->ref_count);
+}
+static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
+
+static void acpi_power_sysfs_remove(struct acpi_device *device)
{
- int result = 0, state;
- acpi_status status = AE_OK;
- struct acpi_power_resource *resource = NULL;
+ device_remove_file(&device->dev, &dev_attr_resource_in_use);
+}
+
+int acpi_add_power_resource(acpi_handle handle)
+{
+ struct acpi_power_resource *resource;
+ struct acpi_device *device = NULL;
union acpi_object acpi_object;
struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
+ acpi_status status;
+ int state, result = -ENODEV;
+ acpi_bus_get_device(handle, &device);
+ if (device)
+ return 0;
- if (!device)
- return -EINVAL;
-
- resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
+ resource = kzalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
return -ENOMEM;
- resource->device = device;
+ device = &resource->device;
+ acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
+ ACPI_STA_DEFAULT);
mutex_init(&resource->resource_lock);
- mutex_init(&resource->devices_lock);
- strcpy(resource->name, device->pnp.bus_id);
+ INIT_LIST_HEAD(&resource->dependent);
+ resource->name = device->pnp.bus_id;
strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
- device->driver_data = resource;
+ device->power.state = ACPI_STATE_UNKNOWN;
/* Evalute the object to get the system level and resource order. */
- status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
- if (ACPI_FAILURE(status)) {
- result = -ENODEV;
- goto end;
- }
+ status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ goto err;
+
resource->system_level = acpi_object.power_resource.system_level;
resource->order = acpi_object.power_resource.resource_order;
- result = acpi_power_get_state(device->handle, &state);
+ result = acpi_power_get_state(handle, &state);
if (result)
- goto end;
-
- switch (state) {
- case ACPI_POWER_RESOURCE_STATE_ON:
- device->power.state = ACPI_STATE_D0;
- break;
- case ACPI_POWER_RESOURCE_STATE_OFF:
- device->power.state = ACPI_STATE_D3;
- break;
- default:
- device->power.state = ACPI_STATE_UNKNOWN;
- break;
- }
+ goto err;
printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
acpi_device_bid(device), state ? "on" : "off");
- end:
+ device->flags.match_driver = true;
+ result = acpi_device_add(device, acpi_release_power_resource);
if (result)
- kfree(resource);
+ goto err;
- return result;
-}
-
-static int acpi_power_remove(struct acpi_device *device, int type)
-{
- struct acpi_power_resource *resource;
-
- if (!device)
- return -EINVAL;
-
- resource = acpi_driver_data(device);
- if (!resource)
- return -EINVAL;
-
- kfree(resource);
+ if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
+ device->remove = acpi_power_sysfs_remove;
+ mutex_lock(&power_resource_list_lock);
+ list_add(&resource->list_node, &acpi_power_resource_list);
+ mutex_unlock(&power_resource_list_lock);
+ acpi_device_add_finalize(device);
return 0;
+
+ err:
+ acpi_release_power_resource(&device->dev);
+ return result;
}
-#ifdef CONFIG_PM_SLEEP
-static int acpi_power_resume(struct device *dev)
+#ifdef CONFIG_ACPI_SLEEP
+void acpi_resume_power_resources(void)
{
- int result = 0, state;
- struct acpi_device *device;
struct acpi_power_resource *resource;
- if (!dev)
- return -EINVAL;
+ mutex_lock(&power_resource_list_lock);
- device = to_acpi_device(dev);
- resource = acpi_driver_data(device);
- if (!resource)
- return -EINVAL;
+ list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
+ int result, state;
- mutex_lock(&resource->resource_lock);
+ mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(device->handle, &state);
- if (result)
- goto unlock;
+ result = acpi_power_get_state(resource->device.handle, &state);
+ if (result)
+ continue;
- if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
- result = __acpi_power_on(resource);
+ if (state == ACPI_POWER_RESOURCE_STATE_OFF
+ && resource->ref_count) {
+ dev_info(&resource->device.dev, "Turning ON\n");
+ __acpi_power_on(resource);
+ } else if (state == ACPI_POWER_RESOURCE_STATE_ON
+ && !resource->ref_count) {
+ dev_info(&resource->device.dev, "Turning OFF\n");
+ __acpi_power_off(resource);
+ }
- unlock:
- mutex_unlock(&resource->resource_lock);
+ mutex_unlock(&resource->resource_lock);
+ }
- return result;
+ mutex_unlock(&power_resource_list_lock);
}
#endif
-
-int __init acpi_power_init(void)
-{
- INIT_LIST_HEAD(&acpi_power_resource_list);
- return acpi_bus_register_driver(&acpi_power_driver);
-}