ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant

When we have the acpi_device pointer, there is no need to pass the
device's handle to the acpi_bus_xxx_power functions to get/set/update
the device's power state, instead, use the acpi_device_xxx_power
functions directly.

To make this happen for fan module, export acpi_device_update_power.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/acpi/device_pm.c

@@ -343,6 +343,7 @@ int acpi_device_update_power(struct acpi_device *device, int *state_p)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(acpi_device_update_power);
 
 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 {

drivers/acpi/fan.c

@@ -92,7 +92,7 @@ static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
 	if (!device)
 		return -EINVAL;
 
-	result = acpi_bus_update_power(device->handle, &acpi_state);
+	result = acpi_device_update_power(device, &acpi_state);
 	if (result)
 		return result;
 
@@ -110,7 +110,7 @@ fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 	if (!device || (state != 0 && state != 1))
 		return -EINVAL;
 
-	result = acpi_bus_set_power(device->handle,
+	result = acpi_device_set_power(device,
 				state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 
 	return result;
@@ -134,7 +134,7 @@ static int acpi_fan_add(struct acpi_device *device)
 	strcpy(acpi_device_name(device), "Fan");
 	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 
-	result = acpi_bus_update_power(device->handle, NULL);
+	result = acpi_device_update_power(device, NULL);
 	if (result) {
 		printk(KERN_ERR PREFIX "Setting initial power state\n");
 		goto end;
@@ -186,7 +186,7 @@ static int acpi_fan_remove(struct acpi_device *device)
 #ifdef CONFIG_PM_SLEEP
 static int acpi_fan_suspend(struct device *dev)
 {
-	acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
+	acpi_device_set_power(to_acpi_device(dev), ACPI_STATE_D0);
 
 	return AE_OK;
 }
@@ -195,7 +195,7 @@ static int acpi_fan_resume(struct device *dev)
 {
 	int result;
 
-	result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
+	result = acpi_device_update_power(to_acpi_device(dev), NULL);
 	if (result)
 		printk(KERN_ERR PREFIX "Error updating fan power state\n");
 

drivers/acpi/internal.h

@@ -104,8 +104,6 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
 int acpi_power_on_resources(struct acpi_device *device, int state);
 int acpi_power_transition(struct acpi_device *device, int state);
 
-int acpi_device_update_power(struct acpi_device *device, int *state_p);
-
 int acpi_wakeup_device_init(void);
 
 #ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC

include/acpi/acpi_bus.h

@@ -435,6 +435,7 @@ int acpi_device_set_power(struct acpi_device *device, int state);
 int acpi_bus_init_power(struct acpi_device *device);
 int acpi_device_fix_up_power(struct acpi_device *device);
 int acpi_bus_update_power(acpi_handle handle, int *state_p);
+int acpi_device_update_power(struct acpi_device *device, int *state_p);
 bool acpi_bus_power_manageable(acpi_handle handle);
 
 #ifdef CONFIG_PM