ACPI / PM: Move device power management functions to device_pm.c

Move ACPI device power management functions from drivers/acpi/bus.c
to drivers/acpi/device_pm.c.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 293 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 6c9b16c16660..01708a165368 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -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)
 {