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@@ -0,0 +1,668 @@
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+/*
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+ * drivers/acpi/device_pm.c - ACPI device power management routines.
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+ *
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+ * Copyright (C) 2012, Intel Corp.
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+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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+ *
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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+ *
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/export.h>
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+#include <linux/mutex.h>
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+#include <linux/pm_qos.h>
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+#include <linux/pm_runtime.h>
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+
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+#include <acpi/acpi.h>
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+#include <acpi/acpi_bus.h>
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+
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+static DEFINE_MUTEX(acpi_pm_notifier_lock);
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+
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+/**
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+ * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
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+ * @adev: ACPI device to add the notifier for.
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+ * @context: Context information to pass to the notifier routine.
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+ *
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+ * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
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+ * PM wakeup events. For example, wakeup events may be generated for bridges
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+ * if one of the devices below the bridge is signaling wakeup, even if the
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+ * bridge itself doesn't have a wakeup GPE associated with it.
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+ */
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+acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
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+ acpi_notify_handler handler, void *context)
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+{
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+ acpi_status status = AE_ALREADY_EXISTS;
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+
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+ mutex_lock(&acpi_pm_notifier_lock);
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+
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+ if (adev->wakeup.flags.notifier_present)
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+ goto out;
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+
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+ status = acpi_install_notify_handler(adev->handle,
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+ ACPI_SYSTEM_NOTIFY,
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+ handler, context);
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+ if (ACPI_FAILURE(status))
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+ goto out;
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+
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+ adev->wakeup.flags.notifier_present = true;
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+
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+ out:
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+ mutex_unlock(&acpi_pm_notifier_lock);
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+ return status;
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+}
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+
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+/**
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+ * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
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+ * @adev: ACPI device to remove the notifier from.
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+ */
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+acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
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+ acpi_notify_handler handler)
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+{
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+ acpi_status status = AE_BAD_PARAMETER;
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+
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+ mutex_lock(&acpi_pm_notifier_lock);
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+
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+ if (!adev->wakeup.flags.notifier_present)
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+ goto out;
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+
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+ status = acpi_remove_notify_handler(adev->handle,
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+ ACPI_SYSTEM_NOTIFY,
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+ handler);
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+ if (ACPI_FAILURE(status))
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+ goto out;
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+
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+ adev->wakeup.flags.notifier_present = false;
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+
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+ out:
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+ mutex_unlock(&acpi_pm_notifier_lock);
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+ return status;
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+}
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+
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+/**
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+ * acpi_device_power_state - Get preferred power state of ACPI device.
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+ * @dev: Device whose preferred target power state to return.
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+ * @adev: ACPI device node corresponding to @dev.
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+ * @target_state: System state to match the resultant device state.
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+ * @d_max_in: Deepest low-power state to take into consideration.
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+ * @d_min_p: Location to store the upper limit of the allowed states range.
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+ * Return value: Preferred power state of the device on success, -ENODEV
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+ * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
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+ *
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+ * Find the lowest power (highest number) ACPI device power state that the
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+ * device can be in while the system is in the state represented by
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+ * @target_state. If @d_min_p is set, the highest power (lowest number) device
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+ * power state that @dev can be in for the given system sleep state is stored
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+ * at the location pointed to by it.
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+ *
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+ * Callers must ensure that @dev and @adev are valid pointers and that @adev
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+ * actually corresponds to @dev before using this function.
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+ */
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+int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
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+ u32 target_state, int d_max_in, int *d_min_p)
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+{
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+ char acpi_method[] = "_SxD";
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+ unsigned long long d_min, d_max;
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+ bool wakeup = false;
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+
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+ if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
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+ return -EINVAL;
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+
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+ if (d_max_in > ACPI_STATE_D3_HOT) {
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+ enum pm_qos_flags_status stat;
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+
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+ stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
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+ if (stat == PM_QOS_FLAGS_ALL)
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+ d_max_in = ACPI_STATE_D3_HOT;
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+ }
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+
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+ acpi_method[2] = '0' + target_state;
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+ /*
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+ * If the sleep state is S0, the lowest limit from ACPI is D3,
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+ * but if the device has _S0W, we will use the value from _S0W
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+ * as the lowest limit from ACPI. Finally, we will constrain
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+ * the lowest limit with the specified one.
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+ */
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+ d_min = ACPI_STATE_D0;
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+ d_max = ACPI_STATE_D3;
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+
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+ /*
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+ * If present, _SxD methods return the minimum D-state (highest power
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+ * state) we can use for the corresponding S-states. Otherwise, the
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+ * minimum D-state is D0 (ACPI 3.x).
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+ *
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+ * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
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+ * provided -- that's our fault recovery, we ignore retval.
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+ */
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+ if (target_state > ACPI_STATE_S0) {
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+ acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
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+ wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
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+ && adev->wakeup.sleep_state >= target_state;
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+ } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
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+ PM_QOS_FLAGS_NONE) {
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+ wakeup = adev->wakeup.flags.valid;
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+ }
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+
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+ /*
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+ * If _PRW says we can wake up the system from the target sleep state,
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+ * the D-state returned by _SxD is sufficient for that (we assume a
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+ * wakeup-aware driver if wake is set). Still, if _SxW exists
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+ * (ACPI 3.x), it should return the maximum (lowest power) D-state that
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+ * can wake the system. _S0W may be valid, too.
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+ */
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+ if (wakeup) {
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+ acpi_status status;
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+
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+ acpi_method[3] = 'W';
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+ status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
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+ &d_max);
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+ if (ACPI_FAILURE(status)) {
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+ if (target_state != ACPI_STATE_S0 ||
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+ status != AE_NOT_FOUND)
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+ d_max = d_min;
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+ } else if (d_max < d_min) {
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+ /* Warn the user of the broken DSDT */
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+ printk(KERN_WARNING "ACPI: Wrong value from %s\n",
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+ acpi_method);
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+ /* Sanitize it */
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+ d_min = d_max;
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+ }
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+ }
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+
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+ if (d_max_in < d_min)
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+ return -EINVAL;
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+ if (d_min_p)
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+ *d_min_p = d_min;
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+ /* constrain d_max with specified lowest limit (max number) */
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+ if (d_max > d_max_in) {
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+ for (d_max = d_max_in; d_max > d_min; d_max--) {
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+ if (adev->power.states[d_max].flags.valid)
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+ break;
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+ }
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+ }
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+ return d_max;
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+}
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+EXPORT_SYMBOL_GPL(acpi_device_power_state);
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+
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+/**
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+ * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
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+ * @dev: Device whose preferred target power state to return.
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+ * @d_min_p: Location to store the upper limit of the allowed states range.
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+ * @d_max_in: Deepest low-power state to take into consideration.
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+ * Return value: Preferred power state of the device on success, -ENODEV
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+ * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
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+ *
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+ * The caller must ensure that @dev is valid before using this function.
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+ */
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+int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
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+{
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+ acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
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+ struct acpi_device *adev;
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+
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+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
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+ dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
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+ return -ENODEV;
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+ }
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+
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+ return acpi_device_power_state(dev, adev, acpi_target_system_state(),
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+ d_max_in, d_min_p);
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+}
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+EXPORT_SYMBOL(acpi_pm_device_sleep_state);
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+
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+#ifdef CONFIG_PM_RUNTIME
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+/**
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+ * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
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+ * @handle: ACPI handle of the device the notification is for.
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+ * @event: Type of the signaled event.
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+ * @context: Device corresponding to @handle.
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+ */
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+static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context)
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+{
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+ struct device *dev = context;
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+
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+ if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) {
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+ pm_wakeup_event(dev, 0);
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+ pm_runtime_resume(dev);
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+ }
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+}
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+
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+/**
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+ * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
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+ * @adev: ACPI device to enable/disable the remote wakeup for.
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+ * @enable: Whether to enable or disable the wakeup functionality.
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+ *
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+ * Enable/disable the GPE associated with @adev so that it can generate
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+ * wakeup signals for the device in response to external (remote) events and
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+ * enable/disable device wakeup power.
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+ *
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+ * Callers must ensure that @adev is a valid ACPI device node before executing
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+ * this function.
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+ */
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+int __acpi_device_run_wake(struct acpi_device *adev, bool enable)
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+{
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+ struct acpi_device_wakeup *wakeup = &adev->wakeup;
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+
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+ if (enable) {
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+ acpi_status res;
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+ int error;
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+
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+ error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0);
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+ if (error)
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+ return error;
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+
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+ res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
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+ if (ACPI_FAILURE(res)) {
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+ acpi_disable_wakeup_device_power(adev);
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+ return -EIO;
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+ }
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+ } else {
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+ acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
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+ acpi_disable_wakeup_device_power(adev);
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+ }
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+ return 0;
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+}
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+
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+/**
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+ * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
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+ * @dev: Device to enable/disable the platform to wake up.
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+ * @enable: Whether to enable or disable the wakeup functionality.
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+ */
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+int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
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+{
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+ struct acpi_device *adev;
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+ acpi_handle handle;
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+
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+ if (!device_run_wake(phys_dev))
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+ return -EINVAL;
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+
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+ handle = DEVICE_ACPI_HANDLE(phys_dev);
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+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
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+ dev_dbg(phys_dev, "ACPI handle without context in %s!\n",
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+ __func__);
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+ return -ENODEV;
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+ }
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+
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+ return __acpi_device_run_wake(adev, enable);
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+}
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+EXPORT_SYMBOL(acpi_pm_device_run_wake);
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+#else
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+static inline void acpi_wakeup_device(acpi_handle handle, u32 event,
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+ void *context) {}
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+#endif /* CONFIG_PM_RUNTIME */
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+
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+ #ifdef CONFIG_PM_SLEEP
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+/**
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+ * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
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+ * @dev: Device to enable/desible to wake up the system.
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+ * @target_state: System state the device is supposed to wake up from.
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+ * @enable: Whether to enable or disable @dev to wake up the system.
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+ */
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+int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state,
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+ bool enable)
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+{
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+ return enable ?
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+ acpi_enable_wakeup_device_power(adev, target_state) :
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+ acpi_disable_wakeup_device_power(adev);
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+}
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+
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+/**
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+ * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
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+ * @dev: Device to enable/desible to wake up the system from sleep states.
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+ * @enable: Whether to enable or disable @dev to wake up the system.
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+ */
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+int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
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+{
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+ acpi_handle handle;
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+ struct acpi_device *adev;
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+ int error;
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+
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+ if (!device_can_wakeup(dev))
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+ return -EINVAL;
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+
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+ handle = DEVICE_ACPI_HANDLE(dev);
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+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
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+ dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
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+ return -ENODEV;
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+ }
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+
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+ error = __acpi_device_sleep_wake(adev, acpi_target_system_state(),
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+ enable);
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+ if (!error)
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+ dev_info(dev, "System wakeup %s by ACPI\n",
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+ enable ? "enabled" : "disabled");
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+
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+ return error;
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+}
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+#endif /* CONFIG_PM_SLEEP */
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+
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+/**
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+ * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
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+ * @dev: Device to get the ACPI node for.
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+ */
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+static struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
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+{
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+ acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
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+ struct acpi_device *adev;
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+
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+ return handle && ACPI_SUCCESS(acpi_bus_get_device(handle, &adev)) ?
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+ adev : NULL;
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+}
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+
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+/**
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+ * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
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+ * @dev: Device to put into a low-power state.
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+ * @adev: ACPI device node corresponding to @dev.
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+ * @system_state: System state to choose the device state for.
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+ */
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+static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
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+ u32 system_state)
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+{
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+ int power_state;
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+
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+ if (!acpi_device_power_manageable(adev))
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+ return 0;
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+
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+ power_state = acpi_device_power_state(dev, adev, system_state,
|
|
|
+ ACPI_STATE_D3, NULL);
|
|
|
+ if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3)
|
|
|
+ return -EIO;
|
|
|
+
|
|
|
+ return acpi_device_set_power(adev, power_state);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
|
|
|
+ * @adev: ACPI device node to put into the full-power state.
|
|
|
+ */
|
|
|
+static int acpi_dev_pm_full_power(struct acpi_device *adev)
|
|
|
+{
|
|
|
+ return acpi_device_power_manageable(adev) ?
|
|
|
+ acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_PM_RUNTIME
|
|
|
+/**
|
|
|
+ * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
|
|
|
+ * @dev: Device to put into a low-power state.
|
|
|
+ *
|
|
|
+ * Put the given device into a runtime low-power state using the standard ACPI
|
|
|
+ * mechanism. Set up remote wakeup if desired, choose the state to put the
|
|
|
+ * device into (this checks if remote wakeup is expected to work too), and set
|
|
|
+ * the power state of the device.
|
|
|
+ */
|
|
|
+int acpi_dev_runtime_suspend(struct device *dev)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+ bool remote_wakeup;
|
|
|
+ int error;
|
|
|
+
|
|
|
+ if (!adev)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) >
|
|
|
+ PM_QOS_FLAGS_NONE;
|
|
|
+ error = __acpi_device_run_wake(adev, remote_wakeup);
|
|
|
+ if (remote_wakeup && error)
|
|
|
+ return -EAGAIN;
|
|
|
+
|
|
|
+ error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
|
+ if (error)
|
|
|
+ __acpi_device_run_wake(adev, false);
|
|
|
+
|
|
|
+ return error;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
|
|
|
+ * @dev: Device to put into the full-power state.
|
|
|
+ *
|
|
|
+ * Put the given device into the full-power state using the standard ACPI
|
|
|
+ * mechanism at run time. Set the power state of the device to ACPI D0 and
|
|
|
+ * disable remote wakeup.
|
|
|
+ */
|
|
|
+int acpi_dev_runtime_resume(struct device *dev)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+ int error;
|
|
|
+
|
|
|
+ if (!adev)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ error = acpi_dev_pm_full_power(adev);
|
|
|
+ __acpi_device_run_wake(adev, false);
|
|
|
+ return error;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_subsys_runtime_suspend - Suspend device using ACPI.
|
|
|
+ * @dev: Device to suspend.
|
|
|
+ *
|
|
|
+ * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
|
|
|
+ * it into a runtime low-power state.
|
|
|
+ */
|
|
|
+int acpi_subsys_runtime_suspend(struct device *dev)
|
|
|
+{
|
|
|
+ int ret = pm_generic_runtime_suspend(dev);
|
|
|
+ return ret ? ret : acpi_dev_runtime_suspend(dev);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_subsys_runtime_resume - Resume device using ACPI.
|
|
|
+ * @dev: Device to Resume.
|
|
|
+ *
|
|
|
+ * Use ACPI to put the given device into the full-power state and carry out the
|
|
|
+ * generic runtime resume procedure for it.
|
|
|
+ */
|
|
|
+int acpi_subsys_runtime_resume(struct device *dev)
|
|
|
+{
|
|
|
+ int ret = acpi_dev_runtime_resume(dev);
|
|
|
+ return ret ? ret : pm_generic_runtime_resume(dev);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
|
|
|
+#endif /* CONFIG_PM_RUNTIME */
|
|
|
+
|
|
|
+#ifdef CONFIG_PM_SLEEP
|
|
|
+/**
|
|
|
+ * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
|
|
|
+ * @dev: Device to put into a low-power state.
|
|
|
+ *
|
|
|
+ * Put the given device into a low-power state during system transition to a
|
|
|
+ * sleep state using the standard ACPI mechanism. Set up system wakeup if
|
|
|
+ * desired, choose the state to put the device into (this checks if system
|
|
|
+ * wakeup is expected to work too), and set the power state of the device.
|
|
|
+ */
|
|
|
+int acpi_dev_suspend_late(struct device *dev)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+ u32 target_state;
|
|
|
+ bool wakeup;
|
|
|
+ int error;
|
|
|
+
|
|
|
+ if (!adev)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ target_state = acpi_target_system_state();
|
|
|
+ wakeup = device_may_wakeup(dev);
|
|
|
+ error = __acpi_device_sleep_wake(adev, target_state, wakeup);
|
|
|
+ if (wakeup && error)
|
|
|
+ return error;
|
|
|
+
|
|
|
+ error = acpi_dev_pm_low_power(dev, adev, target_state);
|
|
|
+ if (error)
|
|
|
+ __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
|
|
|
+
|
|
|
+ return error;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_dev_resume_early - Put device into the full-power state using ACPI.
|
|
|
+ * @dev: Device to put into the full-power state.
|
|
|
+ *
|
|
|
+ * Put the given device into the full-power state using the standard ACPI
|
|
|
+ * mechanism during system transition to the working state. Set the power
|
|
|
+ * state of the device to ACPI D0 and disable remote wakeup.
|
|
|
+ */
|
|
|
+int acpi_dev_resume_early(struct device *dev)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+ int error;
|
|
|
+
|
|
|
+ if (!adev)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ error = acpi_dev_pm_full_power(adev);
|
|
|
+ __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
|
|
|
+ return error;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_resume_early);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
|
|
|
+ * @dev: Device to prepare.
|
|
|
+ */
|
|
|
+int acpi_subsys_prepare(struct device *dev)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Follow PCI and resume devices suspended at run time before running
|
|
|
+ * their system suspend callbacks.
|
|
|
+ */
|
|
|
+ pm_runtime_resume(dev);
|
|
|
+ return pm_generic_prepare(dev);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_subsys_suspend_late - Suspend device using ACPI.
|
|
|
+ * @dev: Device to suspend.
|
|
|
+ *
|
|
|
+ * Carry out the generic late suspend procedure for @dev and use ACPI to put
|
|
|
+ * it into a low-power state during system transition into a sleep state.
|
|
|
+ */
|
|
|
+int acpi_subsys_suspend_late(struct device *dev)
|
|
|
+{
|
|
|
+ int ret = pm_generic_suspend_late(dev);
|
|
|
+ return ret ? ret : acpi_dev_suspend_late(dev);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_subsys_resume_early - Resume device using ACPI.
|
|
|
+ * @dev: Device to Resume.
|
|
|
+ *
|
|
|
+ * Use ACPI to put the given device into the full-power state and carry out the
|
|
|
+ * generic early resume procedure for it during system transition into the
|
|
|
+ * working state.
|
|
|
+ */
|
|
|
+int acpi_subsys_resume_early(struct device *dev)
|
|
|
+{
|
|
|
+ int ret = acpi_dev_resume_early(dev);
|
|
|
+ return ret ? ret : pm_generic_resume_early(dev);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
|
|
|
+#endif /* CONFIG_PM_SLEEP */
|
|
|
+
|
|
|
+static struct dev_pm_domain acpi_general_pm_domain = {
|
|
|
+ .ops = {
|
|
|
+#ifdef CONFIG_PM_RUNTIME
|
|
|
+ .runtime_suspend = acpi_subsys_runtime_suspend,
|
|
|
+ .runtime_resume = acpi_subsys_runtime_resume,
|
|
|
+ .runtime_idle = pm_generic_runtime_idle,
|
|
|
+#endif
|
|
|
+#ifdef CONFIG_PM_SLEEP
|
|
|
+ .prepare = acpi_subsys_prepare,
|
|
|
+ .suspend_late = acpi_subsys_suspend_late,
|
|
|
+ .resume_early = acpi_subsys_resume_early,
|
|
|
+ .poweroff_late = acpi_subsys_suspend_late,
|
|
|
+ .restore_early = acpi_subsys_resume_early,
|
|
|
+#endif
|
|
|
+ },
|
|
|
+};
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_dev_pm_attach - Prepare device for ACPI power management.
|
|
|
+ * @dev: Device to prepare.
|
|
|
+ * @power_on: Whether or not to power on the device.
|
|
|
+ *
|
|
|
+ * If @dev has a valid ACPI handle that has a valid struct acpi_device object
|
|
|
+ * attached to it, install a wakeup notification handler for the device and
|
|
|
+ * add it to the general ACPI PM domain. If @power_on is set, the device will
|
|
|
+ * be put into the ACPI D0 state before the function returns.
|
|
|
+ *
|
|
|
+ * This assumes that the @dev's bus type uses generic power management callbacks
|
|
|
+ * (or doesn't use any power management callbacks at all).
|
|
|
+ *
|
|
|
+ * Callers must ensure proper synchronization of this function with power
|
|
|
+ * management callbacks.
|
|
|
+ */
|
|
|
+int acpi_dev_pm_attach(struct device *dev, bool power_on)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+
|
|
|
+ if (!adev)
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ if (dev->pm_domain)
|
|
|
+ return -EEXIST;
|
|
|
+
|
|
|
+ acpi_add_pm_notifier(adev, acpi_wakeup_device, dev);
|
|
|
+ dev->pm_domain = &acpi_general_pm_domain;
|
|
|
+ if (power_on) {
|
|
|
+ acpi_dev_pm_full_power(adev);
|
|
|
+ __acpi_device_run_wake(adev, false);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
|
|
|
+
|
|
|
+/**
|
|
|
+ * acpi_dev_pm_detach - Remove ACPI power management from the device.
|
|
|
+ * @dev: Device to take care of.
|
|
|
+ * @power_off: Whether or not to try to remove power from the device.
|
|
|
+ *
|
|
|
+ * Remove the device from the general ACPI PM domain and remove its wakeup
|
|
|
+ * notifier. If @power_off is set, additionally remove power from the device if
|
|
|
+ * possible.
|
|
|
+ *
|
|
|
+ * Callers must ensure proper synchronization of this function with power
|
|
|
+ * management callbacks.
|
|
|
+ */
|
|
|
+void acpi_dev_pm_detach(struct device *dev, bool power_off)
|
|
|
+{
|
|
|
+ struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
+
|
|
|
+ if (adev && dev->pm_domain == &acpi_general_pm_domain) {
|
|
|
+ dev->pm_domain = NULL;
|
|
|
+ acpi_remove_pm_notifier(adev, acpi_wakeup_device);
|
|
|
+ if (power_off) {
|
|
|
+ /*
|
|
|
+ * If the device's PM QoS resume latency limit or flags
|
|
|
+ * have been exposed to user space, they have to be
|
|
|
+ * hidden at this point, so that they don't affect the
|
|
|
+ * choice of the low-power state to put the device into.
|
|
|
+ */
|
|
|
+ dev_pm_qos_hide_latency_limit(dev);
|
|
|
+ dev_pm_qos_hide_flags(dev);
|
|
|
+ __acpi_device_run_wake(adev, false);
|
|
|
+ acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
|
Rafael J. Wysocki