ACPI / PM: Move device power management functions to device_pm.c
[linux-3.10.git] / drivers / acpi / bus.c
index 6c9b16c..01708a1 100644 (file)
@@ -178,299 +178,6 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data)
 }
 EXPORT_SYMBOL(acpi_bus_get_private_data);
 
-/* --------------------------------------------------------------------------
-                                 Power Management
-   -------------------------------------------------------------------------- */
-
-/**
- * acpi_power_state_string - String representation of ACPI device power state.
- * @state: ACPI device power state to return the string representation of.
- */
-const char *acpi_power_state_string(int state)
-{
-       switch (state) {
-       case ACPI_STATE_D0:
-               return "D0";
-       case ACPI_STATE_D1:
-               return "D1";
-       case ACPI_STATE_D2:
-               return "D2";
-       case ACPI_STATE_D3_HOT:
-               return "D3hot";
-       case ACPI_STATE_D3_COLD:
-               return "D3";
-       default:
-               return "(unknown)";
-       }
-}
-
-/**
- * acpi_device_get_power - Get power state of an ACPI device.
- * @device: Device to get the power state of.
- * @state: Place to store the power state of the device.
- *
- * This function does not update the device's power.state field, but it may
- * update its parent's power.state field (when the parent's power state is
- * unknown and the device's power state turns out to be D0).
- */
-int acpi_device_get_power(struct acpi_device *device, int *state)
-{
-       int result = ACPI_STATE_UNKNOWN;
-
-       if (!device || !state)
-               return -EINVAL;
-
-       if (!device->flags.power_manageable) {
-               /* TBD: Non-recursive algorithm for walking up hierarchy. */
-               *state = device->parent ?
-                       device->parent->power.state : ACPI_STATE_D0;
-               goto out;
-       }
-
-       /*
-        * Get the device's power state either directly (via _PSC) or
-        * indirectly (via power resources).
-        */
-       if (device->power.flags.explicit_get) {
-               unsigned long long psc;
-               acpi_status status = acpi_evaluate_integer(device->handle,
-                                                          "_PSC", NULL, &psc);
-               if (ACPI_FAILURE(status))
-                       return -ENODEV;
-
-               result = psc;
-       }
-       /* The test below covers ACPI_STATE_UNKNOWN too. */
-       if (result <= ACPI_STATE_D2) {
-         ; /* Do nothing. */
-       } else if (device->power.flags.power_resources) {
-               int error = acpi_power_get_inferred_state(device, &result);
-               if (error)
-                       return error;
-       } else if (result == ACPI_STATE_D3_HOT) {
-               result = ACPI_STATE_D3;
-       }
-
-       /*
-        * If we were unsure about the device parent's power state up to this
-        * point, the fact that the device is in D0 implies that the parent has
-        * to be in D0 too.
-        */
-       if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
-           && result == ACPI_STATE_D0)
-               device->parent->power.state = ACPI_STATE_D0;
-
-       *state = result;
-
- out:
-       ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
-                         device->pnp.bus_id, acpi_power_state_string(*state)));
-
-       return 0;
-}
-
-
-/**
- * acpi_device_set_power - Set power state of an ACPI device.
- * @device: Device to set the power state of.
- * @state: New power state to set.
- *
- * Callers must ensure that the device is power manageable before using this
- * function.
- */
-int acpi_device_set_power(struct acpi_device *device, int state)
-{
-       int result = 0;
-       acpi_status status = AE_OK;
-       char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
-       bool cut_power = false;
-
-       if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
-               return -EINVAL;
-
-       /* Make sure this is a valid target state */
-
-       if (state == device->power.state) {
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
-                                 acpi_power_state_string(state)));
-               return 0;
-       }
-
-       if (!device->power.states[state].flags.valid) {
-               printk(KERN_WARNING PREFIX "Device does not support %s\n",
-                      acpi_power_state_string(state));
-               return -ENODEV;
-       }
-       if (device->parent && (state < device->parent->power.state)) {
-               printk(KERN_WARNING PREFIX
-                             "Cannot set device to a higher-powered"
-                             " state than parent\n");
-               return -ENODEV;
-       }
-
-       /* For D3cold we should first transition into D3hot. */
-       if (state == ACPI_STATE_D3_COLD
-           && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
-               state = ACPI_STATE_D3_HOT;
-               object_name[3] = '3';
-               cut_power = true;
-       }
-
-       /*
-        * Transition Power
-        * ----------------
-        * On transitions to a high-powered state we first apply power (via
-        * power resources) then evalute _PSx.  Conversly for transitions to
-        * a lower-powered state.
-        */
-       if (state < device->power.state) {
-               if (device->power.state >= ACPI_STATE_D3_HOT &&
-                   state != ACPI_STATE_D0) {
-                       printk(KERN_WARNING PREFIX
-                             "Cannot transition to non-D0 state from D3\n");
-                       return -ENODEV;
-               }
-               if (device->power.flags.power_resources) {
-                       result = acpi_power_transition(device, state);
-                       if (result)
-                               goto end;
-               }
-               if (device->power.states[state].flags.explicit_set) {
-                       status = acpi_evaluate_object(device->handle,
-                                                     object_name, NULL, NULL);
-                       if (ACPI_FAILURE(status)) {
-                               result = -ENODEV;
-                               goto end;
-                       }
-               }
-       } else {
-               if (device->power.states[state].flags.explicit_set) {
-                       status = acpi_evaluate_object(device->handle,
-                                                     object_name, NULL, NULL);
-                       if (ACPI_FAILURE(status)) {
-                               result = -ENODEV;
-                               goto end;
-                       }
-               }
-               if (device->power.flags.power_resources) {
-                       result = acpi_power_transition(device, state);
-                       if (result)
-                               goto end;
-               }
-       }
-
-       if (cut_power)
-               result = acpi_power_transition(device, ACPI_STATE_D3_COLD);
-
-      end:
-       if (result)
-               printk(KERN_WARNING PREFIX
-                             "Device [%s] failed to transition to %s\n",
-                             device->pnp.bus_id,
-                             acpi_power_state_string(state));
-       else {
-               device->power.state = state;
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                 "Device [%s] transitioned to %s\n",
-                                 device->pnp.bus_id,
-                                 acpi_power_state_string(state)));
-       }
-
-       return result;
-}
-EXPORT_SYMBOL(acpi_device_set_power);
-
-
-int acpi_bus_set_power(acpi_handle handle, int state)
-{
-       struct acpi_device *device;
-       int result;
-
-       result = acpi_bus_get_device(handle, &device);
-       if (result)
-               return result;
-
-       if (!device->flags.power_manageable) {
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                               "Device [%s] is not power manageable\n",
-                               dev_name(&device->dev)));
-               return -ENODEV;
-       }
-
-       return acpi_device_set_power(device, state);
-}
-EXPORT_SYMBOL(acpi_bus_set_power);
-
-
-int acpi_bus_init_power(struct acpi_device *device)
-{
-       int state;
-       int result;
-
-       if (!device)
-               return -EINVAL;
-
-       device->power.state = ACPI_STATE_UNKNOWN;
-
-       result = acpi_device_get_power(device, &state);
-       if (result)
-               return result;
-
-       if (device->power.flags.power_resources)
-               result = acpi_power_on_resources(device, state);
-
-       if (!result)
-               device->power.state = state;
-
-       return result;
-}
-
-
-int acpi_bus_update_power(acpi_handle handle, int *state_p)
-{
-       struct acpi_device *device;
-       int state;
-       int result;
-
-       result = acpi_bus_get_device(handle, &device);
-       if (result)
-               return result;
-
-       result = acpi_device_get_power(device, &state);
-       if (result)
-               return result;
-
-       result = acpi_device_set_power(device, state);
-       if (!result && state_p)
-               *state_p = state;
-
-       return result;
-}
-EXPORT_SYMBOL_GPL(acpi_bus_update_power);
-
-
-bool acpi_bus_power_manageable(acpi_handle handle)
-{
-       struct acpi_device *device;
-       int result;
-
-       result = acpi_bus_get_device(handle, &device);
-       return result ? false : device->flags.power_manageable;
-}
-
-EXPORT_SYMBOL(acpi_bus_power_manageable);
-
-bool acpi_bus_can_wakeup(acpi_handle handle)
-{
-       struct acpi_device *device;
-       int result;
-
-       result = acpi_bus_get_device(handle, &device);
-       return result ? false : device->wakeup.flags.valid;
-}
-
-EXPORT_SYMBOL(acpi_bus_can_wakeup);
-
 static void acpi_print_osc_error(acpi_handle handle,
        struct acpi_osc_context *context, char *error)
 {