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-rw-r--r--drivers/base/power/sysfs.c838
1 files changed, 838 insertions, 0 deletions
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
new file mode 100644
index 0000000000..a1474fb67d
--- /dev/null
+++ b/drivers/base/power/sysfs.c
@@ -0,0 +1,838 @@
+// SPDX-License-Identifier: GPL-2.0
+/* sysfs entries for device PM */
+#include <linux/device.h>
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/export.h>
+#include <linux/pm_qos.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_wakeup.h>
+#include <linux/atomic.h>
+#include <linux/jiffies.h>
+#include "power.h"
+
+/*
+ * control - Report/change current runtime PM setting of the device
+ *
+ * Runtime power management of a device can be blocked with the help of
+ * this attribute. All devices have one of the following two values for
+ * the power/control file:
+ *
+ * + "auto\n" to allow the device to be power managed at run time;
+ * + "on\n" to prevent the device from being power managed at run time;
+ *
+ * The default for all devices is "auto", which means that devices may be
+ * subject to automatic power management, depending on their drivers.
+ * Changing this attribute to "on" prevents the driver from power managing
+ * the device at run time. Doing that while the device is suspended causes
+ * it to be woken up.
+ *
+ * wakeup - Report/change current wakeup option for device
+ *
+ * Some devices support "wakeup" events, which are hardware signals
+ * used to activate devices from suspended or low power states. Such
+ * devices have one of three values for the sysfs power/wakeup file:
+ *
+ * + "enabled\n" to issue the events;
+ * + "disabled\n" not to do so; or
+ * + "\n" for temporary or permanent inability to issue wakeup.
+ *
+ * (For example, unconfigured USB devices can't issue wakeups.)
+ *
+ * Familiar examples of devices that can issue wakeup events include
+ * keyboards and mice (both PS2 and USB styles), power buttons, modems,
+ * "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
+ * will wake the entire system from a suspend state; others may just
+ * wake up the device (if the system as a whole is already active).
+ * Some wakeup events use normal IRQ lines; other use special out
+ * of band signaling.
+ *
+ * It is the responsibility of device drivers to enable (or disable)
+ * wakeup signaling as part of changing device power states, respecting
+ * the policy choices provided through the driver model.
+ *
+ * Devices may not be able to generate wakeup events from all power
+ * states. Also, the events may be ignored in some configurations;
+ * for example, they might need help from other devices that aren't
+ * active, or which may have wakeup disabled. Some drivers rely on
+ * wakeup events internally (unless they are disabled), keeping
+ * their hardware in low power modes whenever they're unused. This
+ * saves runtime power, without requiring system-wide sleep states.
+ *
+ * async - Report/change current async suspend setting for the device
+ *
+ * Asynchronous suspend and resume of the device during system-wide power
+ * state transitions can be enabled by writing "enabled" to this file.
+ * Analogously, if "disabled" is written to this file, the device will be
+ * suspended and resumed synchronously.
+ *
+ * All devices have one of the following two values for power/async:
+ *
+ * + "enabled\n" to permit the asynchronous suspend/resume of the device;
+ * + "disabled\n" to forbid it;
+ *
+ * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
+ * of a device unless it is certain that all of the PM dependencies of the
+ * device are known to the PM core. However, for some devices this
+ * attribute is set to "enabled" by bus type code or device drivers and in
+ * that cases it should be safe to leave the default value.
+ *
+ * autosuspend_delay_ms - Report/change a device's autosuspend_delay value
+ *
+ * Some drivers don't want to carry out a runtime suspend as soon as a
+ * device becomes idle; they want it always to remain idle for some period
+ * of time before suspending it. This period is the autosuspend_delay
+ * value (expressed in milliseconds) and it can be controlled by the user.
+ * If the value is negative then the device will never be runtime
+ * suspended.
+ *
+ * NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
+ * value are used only if the driver calls pm_runtime_use_autosuspend().
+ *
+ * wakeup_count - Report the number of wakeup events related to the device
+ */
+
+const char power_group_name[] = "power";
+EXPORT_SYMBOL_GPL(power_group_name);
+
+static const char ctrl_auto[] = "auto";
+static const char ctrl_on[] = "on";
+
+static ssize_t control_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%s\n",
+ dev->power.runtime_auto ? ctrl_auto : ctrl_on);
+}
+
+static ssize_t control_store(struct device * dev, struct device_attribute *attr,
+ const char * buf, size_t n)
+{
+ device_lock(dev);
+ if (sysfs_streq(buf, ctrl_auto))
+ pm_runtime_allow(dev);
+ else if (sysfs_streq(buf, ctrl_on))
+ pm_runtime_forbid(dev);
+ else
+ n = -EINVAL;
+ device_unlock(dev);
+ return n;
+}
+
+static DEVICE_ATTR_RW(control);
+
+static ssize_t runtime_active_time_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u64 tmp = pm_runtime_active_time(dev);
+
+ do_div(tmp, NSEC_PER_MSEC);
+
+ return sysfs_emit(buf, "%llu\n", tmp);
+}
+
+static DEVICE_ATTR_RO(runtime_active_time);
+
+static ssize_t runtime_suspended_time_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u64 tmp = pm_runtime_suspended_time(dev);
+
+ do_div(tmp, NSEC_PER_MSEC);
+
+ return sysfs_emit(buf, "%llu\n", tmp);
+}
+
+static DEVICE_ATTR_RO(runtime_suspended_time);
+
+static ssize_t runtime_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const char *output;
+
+ if (dev->power.runtime_error) {
+ output = "error";
+ } else if (dev->power.disable_depth) {
+ output = "unsupported";
+ } else {
+ switch (dev->power.runtime_status) {
+ case RPM_SUSPENDED:
+ output = "suspended";
+ break;
+ case RPM_SUSPENDING:
+ output = "suspending";
+ break;
+ case RPM_RESUMING:
+ output = "resuming";
+ break;
+ case RPM_ACTIVE:
+ output = "active";
+ break;
+ default:
+ return -EIO;
+ }
+ }
+ return sysfs_emit(buf, "%s\n", output);
+}
+
+static DEVICE_ATTR_RO(runtime_status);
+
+static ssize_t autosuspend_delay_ms_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ if (!dev->power.use_autosuspend)
+ return -EIO;
+
+ return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay);
+}
+
+static ssize_t autosuspend_delay_ms_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t n)
+{
+ long delay;
+
+ if (!dev->power.use_autosuspend)
+ return -EIO;
+
+ if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
+ return -EINVAL;
+
+ device_lock(dev);
+ pm_runtime_set_autosuspend_delay(dev, delay);
+ device_unlock(dev);
+ return n;
+}
+
+static DEVICE_ATTR_RW(autosuspend_delay_ms);
+
+static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ s32 value = dev_pm_qos_requested_resume_latency(dev);
+
+ if (value == 0)
+ return sysfs_emit(buf, "n/a\n");
+ if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ value = 0;
+
+ return sysfs_emit(buf, "%d\n", value);
+}
+
+static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ s32 value;
+ int ret;
+
+ if (!kstrtos32(buf, 0, &value)) {
+ /*
+ * Prevent users from writing negative or "no constraint" values
+ * directly.
+ */
+ if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ return -EINVAL;
+
+ if (value == 0)
+ value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
+ } else if (sysfs_streq(buf, "n/a")) {
+ value = 0;
+ } else {
+ return -EINVAL;
+ }
+
+ ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
+ value);
+ return ret < 0 ? ret : n;
+}
+
+static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
+
+static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
+
+ if (value < 0)
+ return sysfs_emit(buf, "%s\n", "auto");
+ if (value == PM_QOS_LATENCY_ANY)
+ return sysfs_emit(buf, "%s\n", "any");
+
+ return sysfs_emit(buf, "%d\n", value);
+}
+
+static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ s32 value;
+ int ret;
+
+ if (kstrtos32(buf, 0, &value) == 0) {
+ /* Users can't write negative values directly */
+ if (value < 0)
+ return -EINVAL;
+ } else {
+ if (sysfs_streq(buf, "auto"))
+ value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
+ else if (sysfs_streq(buf, "any"))
+ value = PM_QOS_LATENCY_ANY;
+ else
+ return -EINVAL;
+ }
+ ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
+ return ret < 0 ? ret : n;
+}
+
+static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
+
+static ssize_t pm_qos_no_power_off_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
+ & PM_QOS_FLAG_NO_POWER_OFF));
+}
+
+static ssize_t pm_qos_no_power_off_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ int ret;
+
+ if (kstrtoint(buf, 0, &ret))
+ return -EINVAL;
+
+ if (ret != 0 && ret != 1)
+ return -EINVAL;
+
+ ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
+ return ret < 0 ? ret : n;
+}
+
+static DEVICE_ATTR_RW(pm_qos_no_power_off);
+
+#ifdef CONFIG_PM_SLEEP
+static const char _enabled[] = "enabled";
+static const char _disabled[] = "disabled";
+
+static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%s\n", device_can_wakeup(dev)
+ ? (device_may_wakeup(dev) ? _enabled : _disabled)
+ : "");
+}
+
+static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ if (!device_can_wakeup(dev))
+ return -EINVAL;
+
+ if (sysfs_streq(buf, _enabled))
+ device_set_wakeup_enable(dev, 1);
+ else if (sysfs_streq(buf, _disabled))
+ device_set_wakeup_enable(dev, 0);
+ else
+ return -EINVAL;
+ return n;
+}
+
+static DEVICE_ATTR_RW(wakeup);
+
+static ssize_t wakeup_count_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long count;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ count = dev->power.wakeup->wakeup_count;
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lu\n", count);
+}
+
+static DEVICE_ATTR_RO(wakeup_count);
+
+static ssize_t wakeup_active_count_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long count;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ count = dev->power.wakeup->active_count;
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lu\n", count);
+}
+
+static DEVICE_ATTR_RO(wakeup_active_count);
+
+static ssize_t wakeup_abort_count_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long count;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ count = dev->power.wakeup->wakeup_count;
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lu\n", count);
+}
+
+static DEVICE_ATTR_RO(wakeup_abort_count);
+
+static ssize_t wakeup_expire_count_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long count;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ count = dev->power.wakeup->expire_count;
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lu\n", count);
+}
+
+static DEVICE_ATTR_RO(wakeup_expire_count);
+
+static ssize_t wakeup_active_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned int active;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ active = dev->power.wakeup->active;
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%u\n", active);
+}
+
+static DEVICE_ATTR_RO(wakeup_active);
+
+static ssize_t wakeup_total_time_ms_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ s64 msec;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ msec = ktime_to_ms(dev->power.wakeup->total_time);
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lld\n", msec);
+}
+
+static DEVICE_ATTR_RO(wakeup_total_time_ms);
+
+static ssize_t wakeup_max_time_ms_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ s64 msec;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ msec = ktime_to_ms(dev->power.wakeup->max_time);
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lld\n", msec);
+}
+
+static DEVICE_ATTR_RO(wakeup_max_time_ms);
+
+static ssize_t wakeup_last_time_ms_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ s64 msec;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ msec = ktime_to_ms(dev->power.wakeup->last_time);
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lld\n", msec);
+}
+
+static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
+ kgid_t kgid)
+{
+ if (dev->power.wakeup && dev->power.wakeup->dev)
+ return device_change_owner(dev->power.wakeup->dev, kuid, kgid);
+ return 0;
+}
+
+static DEVICE_ATTR_RO(wakeup_last_time_ms);
+
+#ifdef CONFIG_PM_AUTOSLEEP
+static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ s64 msec;
+ bool enabled = false;
+
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.wakeup) {
+ msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
+ enabled = true;
+ }
+ spin_unlock_irq(&dev->power.lock);
+
+ if (!enabled)
+ return sysfs_emit(buf, "\n");
+ return sysfs_emit(buf, "%lld\n", msec);
+}
+
+static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
+#endif /* CONFIG_PM_AUTOSLEEP */
+#else /* CONFIG_PM_SLEEP */
+static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
+ kgid_t kgid)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_PM_ADVANCED_DEBUG
+static ssize_t runtime_usage_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "%d\n", atomic_read(&dev->power.usage_count));
+}
+static DEVICE_ATTR_RO(runtime_usage);
+
+static ssize_t runtime_active_kids_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%d\n", dev->power.ignore_children ?
+ 0 : atomic_read(&dev->power.child_count));
+}
+static DEVICE_ATTR_RO(runtime_active_kids);
+
+static ssize_t runtime_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const char *output;
+
+ if (dev->power.disable_depth && !dev->power.runtime_auto)
+ output = "disabled & forbidden";
+ else if (dev->power.disable_depth)
+ output = "disabled";
+ else if (!dev->power.runtime_auto)
+ output = "forbidden";
+ else
+ output = "enabled";
+
+ return sysfs_emit(buf, "%s\n", output);
+}
+static DEVICE_ATTR_RO(runtime_enabled);
+
+#ifdef CONFIG_PM_SLEEP
+static ssize_t async_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%s\n",
+ device_async_suspend_enabled(dev) ?
+ _enabled : _disabled);
+}
+
+static ssize_t async_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ if (sysfs_streq(buf, _enabled))
+ device_enable_async_suspend(dev);
+ else if (sysfs_streq(buf, _disabled))
+ device_disable_async_suspend(dev);
+ else
+ return -EINVAL;
+ return n;
+}
+
+static DEVICE_ATTR_RW(async);
+
+#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_PM_ADVANCED_DEBUG */
+
+static struct attribute *power_attrs[] = {
+#ifdef CONFIG_PM_ADVANCED_DEBUG
+#ifdef CONFIG_PM_SLEEP
+ &dev_attr_async.attr,
+#endif
+ &dev_attr_runtime_status.attr,
+ &dev_attr_runtime_usage.attr,
+ &dev_attr_runtime_active_kids.attr,
+ &dev_attr_runtime_enabled.attr,
+#endif /* CONFIG_PM_ADVANCED_DEBUG */
+ NULL,
+};
+static const struct attribute_group pm_attr_group = {
+ .name = power_group_name,
+ .attrs = power_attrs,
+};
+
+static struct attribute *wakeup_attrs[] = {
+#ifdef CONFIG_PM_SLEEP
+ &dev_attr_wakeup.attr,
+ &dev_attr_wakeup_count.attr,
+ &dev_attr_wakeup_active_count.attr,
+ &dev_attr_wakeup_abort_count.attr,
+ &dev_attr_wakeup_expire_count.attr,
+ &dev_attr_wakeup_active.attr,
+ &dev_attr_wakeup_total_time_ms.attr,
+ &dev_attr_wakeup_max_time_ms.attr,
+ &dev_attr_wakeup_last_time_ms.attr,
+#ifdef CONFIG_PM_AUTOSLEEP
+ &dev_attr_wakeup_prevent_sleep_time_ms.attr,
+#endif
+#endif
+ NULL,
+};
+static const struct attribute_group pm_wakeup_attr_group = {
+ .name = power_group_name,
+ .attrs = wakeup_attrs,
+};
+
+static struct attribute *runtime_attrs[] = {
+#ifndef CONFIG_PM_ADVANCED_DEBUG
+ &dev_attr_runtime_status.attr,
+#endif
+ &dev_attr_control.attr,
+ &dev_attr_runtime_suspended_time.attr,
+ &dev_attr_runtime_active_time.attr,
+ &dev_attr_autosuspend_delay_ms.attr,
+ NULL,
+};
+static const struct attribute_group pm_runtime_attr_group = {
+ .name = power_group_name,
+ .attrs = runtime_attrs,
+};
+
+static struct attribute *pm_qos_resume_latency_attrs[] = {
+ &dev_attr_pm_qos_resume_latency_us.attr,
+ NULL,
+};
+static const struct attribute_group pm_qos_resume_latency_attr_group = {
+ .name = power_group_name,
+ .attrs = pm_qos_resume_latency_attrs,
+};
+
+static struct attribute *pm_qos_latency_tolerance_attrs[] = {
+ &dev_attr_pm_qos_latency_tolerance_us.attr,
+ NULL,
+};
+static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
+ .name = power_group_name,
+ .attrs = pm_qos_latency_tolerance_attrs,
+};
+
+static struct attribute *pm_qos_flags_attrs[] = {
+ &dev_attr_pm_qos_no_power_off.attr,
+ NULL,
+};
+static const struct attribute_group pm_qos_flags_attr_group = {
+ .name = power_group_name,
+ .attrs = pm_qos_flags_attrs,
+};
+
+int dpm_sysfs_add(struct device *dev)
+{
+ int rc;
+
+ /* No need to create PM sysfs if explicitly disabled. */
+ if (device_pm_not_required(dev))
+ return 0;
+
+ rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
+ if (rc)
+ return rc;
+
+ if (!pm_runtime_has_no_callbacks(dev)) {
+ rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
+ if (rc)
+ goto err_out;
+ }
+ if (device_can_wakeup(dev)) {
+ rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
+ if (rc)
+ goto err_runtime;
+ }
+ if (dev->power.set_latency_tolerance) {
+ rc = sysfs_merge_group(&dev->kobj,
+ &pm_qos_latency_tolerance_attr_group);
+ if (rc)
+ goto err_wakeup;
+ }
+ rc = pm_wakeup_source_sysfs_add(dev);
+ if (rc)
+ goto err_latency;
+ return 0;
+
+ err_latency:
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
+ err_wakeup:
+ sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
+ err_runtime:
+ sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
+ err_out:
+ sysfs_remove_group(&dev->kobj, &pm_attr_group);
+ return rc;
+}
+
+int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
+{
+ int rc;
+
+ if (device_pm_not_required(dev))
+ return 0;
+
+ rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid);
+ if (rc)
+ return rc;
+
+ if (!pm_runtime_has_no_callbacks(dev)) {
+ rc = sysfs_group_change_owner(
+ &dev->kobj, &pm_runtime_attr_group, kuid, kgid);
+ if (rc)
+ return rc;
+ }
+
+ if (device_can_wakeup(dev)) {
+ rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group,
+ kuid, kgid);
+ if (rc)
+ return rc;
+
+ rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid);
+ if (rc)
+ return rc;
+ }
+
+ if (dev->power.set_latency_tolerance) {
+ rc = sysfs_group_change_owner(
+ &dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid,
+ kgid);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+int wakeup_sysfs_add(struct device *dev)
+{
+ int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
+
+ if (!ret)
+ kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+
+ return ret;
+}
+
+void wakeup_sysfs_remove(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
+ kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+}
+
+int pm_qos_sysfs_add_resume_latency(struct device *dev)
+{
+ return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
+}
+
+void pm_qos_sysfs_remove_resume_latency(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
+}
+
+int pm_qos_sysfs_add_flags(struct device *dev)
+{
+ return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
+}
+
+void pm_qos_sysfs_remove_flags(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
+}
+
+int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
+{
+ return sysfs_merge_group(&dev->kobj,
+ &pm_qos_latency_tolerance_attr_group);
+}
+
+void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
+}
+
+void rpm_sysfs_remove(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
+}
+
+void dpm_sysfs_remove(struct device *dev)
+{
+ if (device_pm_not_required(dev))
+ return;
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
+ dev_pm_qos_constraints_destroy(dev);
+ rpm_sysfs_remove(dev);
+ sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
+ sysfs_remove_group(&dev->kobj, &pm_attr_group);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 12:18:41 +0000