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path: root/drivers/acpi/power.c
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Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c72
1 files changed, 47 insertions, 25 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 89e5d2a8c33..a1718e56103 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -54,6 +54,14 @@ ACPI_MODULE_NAME("power");
#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
#define ACPI_POWER_RESOURCE_STATE_ON 0x01
#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
+
+#ifdef MODULE_PARAM_PREFIX
+#undef MODULE_PARAM_PREFIX
+#endif
+#define MODULE_PARAM_PREFIX "acpi."
+int acpi_power_nocheck;
+module_param_named(power_nocheck, acpi_power_nocheck, bool, 000);
+
static int acpi_power_add(struct acpi_device *device);
static int acpi_power_remove(struct acpi_device *device, int type);
static int acpi_power_resume(struct acpi_device *device);
@@ -128,16 +136,16 @@ acpi_power_get_context(acpi_handle handle,
return 0;
}
-static int acpi_power_get_state(struct acpi_power_resource *resource, int *state)
+static int acpi_power_get_state(acpi_handle handle, int *state)
{
acpi_status status = AE_OK;
unsigned long long sta = 0;
- if (!resource || !state)
+ if (!handle || !state)
return -EINVAL;
- status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta);
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status))
return -ENODEV;
@@ -145,7 +153,7 @@ static int acpi_power_get_state(struct acpi_power_resource *resource, int *state
ACPI_POWER_RESOURCE_STATE_OFF;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
- resource->name, state ? "on" : "off"));
+ acpi_ut_get_node_name(handle), state ? "on" : "off"));
return 0;
}
@@ -153,7 +161,6 @@ static int acpi_power_get_state(struct acpi_power_resource *resource, int *state
static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
{
int result = 0, state1;
- struct acpi_power_resource *resource = NULL;
u32 i = 0;
@@ -161,12 +168,15 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
return -EINVAL;
/* The state of the list is 'on' IFF all resources are 'on'. */
+ /* */
for (i = 0; i < list->count; i++) {
- result = acpi_power_get_context(list->handles[i], &resource);
- if (result)
- return result;
- result = acpi_power_get_state(resource, &state1);
+ /*
+ * The state of the power resource can be obtained by
+ * using the ACPI handle. In such case it is unnecessary to
+ * get the Power resource first and then get its state again.
+ */
+ result = acpi_power_get_state(list->handles[i], &state1);
if (result)
return result;
@@ -226,12 +236,18 @@ static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
if (ACPI_FAILURE(status))
return -ENODEV;
- result = acpi_power_get_state(resource, &state);
- if (result)
- return result;
- if (state != ACPI_POWER_RESOURCE_STATE_ON)
- return -ENOEXEC;
-
+ if (!acpi_power_nocheck) {
+ /*
+ * If acpi_power_nocheck is set, it is unnecessary to check
+ * the power state after power transition.
+ */
+ result = acpi_power_get_state(resource->device->handle,
+ &state);
+ if (result)
+ return result;
+ if (state != ACPI_POWER_RESOURCE_STATE_ON)
+ return -ENOEXEC;
+ }
/* Update the power resource's _device_ power state */
resource->device->power.state = ACPI_STATE_D0;
@@ -277,11 +293,17 @@ static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
if (ACPI_FAILURE(status))
return -ENODEV;
- result = acpi_power_get_state(resource, &state);
- if (result)
- return result;
- if (state != ACPI_POWER_RESOURCE_STATE_OFF)
- return -ENOEXEC;
+ if (!acpi_power_nocheck) {
+ /*
+ * If acpi_power_nocheck is set, it is unnecessary to check
+ * the power state after power transition.
+ */
+ result = acpi_power_get_state(handle, &state);
+ if (result)
+ return result;
+ if (state != ACPI_POWER_RESOURCE_STATE_OFF)
+ return -ENOEXEC;
+ }
/* Update the power resource's _device_ power state */
resource->device->power.state = ACPI_STATE_D3;
@@ -555,7 +577,7 @@ static int acpi_power_seq_show(struct seq_file *seq, void *offset)
if (!resource)
goto end;
- result = acpi_power_get_state(resource, &state);
+ result = acpi_power_get_state(resource->device->handle, &state);
if (result)
goto end;
@@ -657,7 +679,7 @@ static int acpi_power_add(struct acpi_device *device)
strcpy(resource->name, device->pnp.bus_id);
strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
- acpi_driver_data(device) = resource;
+ device->driver_data = resource;
/* Evalute the object to get the system level and resource order. */
status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
@@ -668,7 +690,7 @@ static int acpi_power_add(struct acpi_device *device)
resource->system_level = acpi_object.power_resource.system_level;
resource->order = acpi_object.power_resource.resource_order;
- result = acpi_power_get_state(resource, &state);
+ result = acpi_power_get_state(device->handle, &state);
if (result)
goto end;
@@ -733,9 +755,9 @@ static int acpi_power_resume(struct acpi_device *device)
if (!device || !acpi_driver_data(device))
return -EINVAL;
- resource = (struct acpi_power_resource *)acpi_driver_data(device);
+ resource = acpi_driver_data(device);
- result = acpi_power_get_state(resource, &state);
+ result = acpi_power_get_state(device->handle, &state);
if (result)
return result;