#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include "sleep.h"
+#include "internal.h"
#define PREFIX "ACPI: "
},
};
+/*
+ * 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_resource {
struct acpi_device * device;
acpi_bus_id name;
u32 order;
unsigned int ref_count;
struct mutex resource_lock;
+
+ /* List of devices relying on this power resource */
+ struct acpi_power_resource_device *devices;
};
static struct list_head acpi_power_resource_list;
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)
+{
+ struct acpi_device *acpi_dev;
+ acpi_handle handle = device->handle;
+ int state;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return;
+
+ if(acpi_power_get_inferred_state(acpi_dev, &state))
+ return;
+
+ if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
+ pm_request_resume(device->dev);
+}
+
static int __acpi_power_on(struct acpi_power_resource *resource)
{
+ struct acpi_power_resource_device *device_list = resource->devices;
acpi_status status = AE_OK;
status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
resource->name));
+ while (device_list) {
+ acpi_power_on_device(device_list->device);
+
+ device_list = device_list->next;
+ }
+
return 0;
}
return result;
}
+static void __acpi_power_resource_unregister_device(struct device *dev,
+ acpi_handle res_handle)
+{
+ struct acpi_power_resource *resource = NULL;
+ struct acpi_power_resource_device *prev, *curr;
+
+ if (acpi_power_get_context(res_handle, &resource))
+ return;
+
+ mutex_lock(&resource->resource_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);
+ break;
+ }
+
+ prev = curr;
+ curr = curr->next;
+ }
+ mutex_unlock(&resource->resource_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;
+
+ if (!dev || !handle)
+ return;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return;
+
+ list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+
+ for (i = 0; i < list->count; i++)
+ __acpi_power_resource_unregister_device(dev,
+ list->handles[i]);
+}
+
+static int __acpi_power_resource_register_device(
+ struct acpi_power_managed_device *powered_device, acpi_handle handle)
+{
+ 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;
+
+ power_resource_device = kzalloc(
+ sizeof(*power_resource_device), GFP_KERNEL);
+ if (!power_resource_device)
+ return -ENOMEM;
+
+ power_resource_device->device = powered_device;
+
+ mutex_lock(&resource->resource_lock);
+ power_resource_device->next = resource->devices;
+ resource->devices = power_resource_device;
+ mutex_unlock(&resource->resource_lock);
+
+ return 0;
+}
+
+/* Link dev to all power resources in _PR0 */
+int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
+{
+ struct acpi_device *acpi_dev;
+ struct acpi_handle_list *list;
+ struct acpi_power_managed_device *powered_device;
+ int i, ret;
+
+ if (!dev || !handle)
+ return -ENODEV;
+
+ ret = acpi_bus_get_device(handle, &acpi_dev);
+ if (ret)
+ goto no_power_resource;
+
+ if (!acpi_dev->power.flags.power_resources)
+ goto no_power_resource;
+
+ powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
+ if (!powered_device)
+ return -ENOMEM;
+
+ powered_device->dev = dev;
+ powered_device->handle = handle;
+
+ list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+
+ for (i = 0; i < list->count; i++) {
+ ret = __acpi_power_resource_register_device(powered_device,
+ list->handles[i]);
+
+ if (ret) {
+ acpi_power_resource_unregister_device(dev, handle);
+ break;
+ }
+ }
+
+ return ret;
+
+no_power_resource:
+ printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
+ return -ENODEV;
+}
+
/**
* acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
* ACPI 3.0) _PSW (Power State Wake)
* We know a device's inferred power state when all the resources
* required for a given D-state are 'on'.
*/
- for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
+ for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
list = &device->power.states[i].resources;
if (list->count < 1)
continue;
{
int result;
- if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
+ if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
return -EINVAL;
if (device->power.state == state)
return 0;
if ((device->power.state < ACPI_STATE_D0)
- || (device->power.state > ACPI_STATE_D3))
+ || (device->power.state > ACPI_STATE_D3_COLD))
return -ENODEV;
/* TBD: Resources must be ordered. */
projects / mv-sheeva.git / blobdiff