*/
#include <linux/device.h>
+#include <linux/kallsyms.h>
+#include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/resume-trace.h>
+#include <linux/rwsem.h>
+
+#include "../base.h"
#include "power.h"
-LIST_HEAD(dpm_active);
-LIST_HEAD(dpm_off);
-LIST_HEAD(dpm_off_irq);
+/*
+ * The entries in the dpm_active list are in a depth first order, simply
+ * because children are guaranteed to be discovered after parents, and
+ * are inserted at the back of the list on discovery.
+ *
+ * All the other lists are kept in the same order, for consistency.
+ * However the lists aren't always traversed in the same order.
+ * Semaphores must be acquired from the top (i.e., front) down
+ * and released in the opposite order. Devices must be suspended
+ * from the bottom (i.e., end) up and resumed in the opposite order.
+ * That way no parent will be suspended while it still has an active
+ * child.
+ *
+ * Since device_pm_add() may be called with a device semaphore held,
+ * we must never try to acquire a device semaphore while holding
+ * dpm_list_mutex.
+ */
-DECLARE_MUTEX(dpm_sem);
-DECLARE_MUTEX(dpm_list_sem);
+LIST_HEAD(dpm_active);
+static LIST_HEAD(dpm_off);
+static LIST_HEAD(dpm_off_irq);
-int (*platform_enable_wakeup)(struct device *dev, int is_on);
+static DEFINE_MUTEX(dpm_list_mtx);
+/* 'true' if all devices have been suspended, protected by dpm_list_mtx */
+static bool all_sleeping;
/**
- * device_pm_set_parent - Specify power dependency.
- * @dev: Device who needs power.
- * @parent: Device that supplies power.
- *
- * This function is used to manually describe a power-dependency
- * relationship. It may be used to specify a transversal relationship
- * (where the power supplier is not the physical (or electrical)
- * ancestor of a specific device.
- * The effect of this is that the supplier will not be powered down
- * before the power dependent.
+ * device_pm_add - add a device to the list of active devices
+ * @dev: Device to be added to the list
*/
-
-void device_pm_set_parent(struct device * dev, struct device * parent)
+int device_pm_add(struct device *dev)
{
- put_device(dev->power.pm_parent);
- dev->power.pm_parent = get_device(parent);
-}
-EXPORT_SYMBOL_GPL(device_pm_set_parent);
-
-int device_pm_add(struct device * dev)
-{
- int error;
+ int error = 0;
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
- down(&dpm_list_sem);
- list_add_tail(&dev->power.entry, &dpm_active);
- device_pm_set_parent(dev, dev->parent);
- if ((error = dpm_sysfs_add(dev)))
- list_del(&dev->power.entry);
- up(&dpm_list_sem);
+ mutex_lock(&dpm_list_mtx);
+ if ((dev->parent && dev->parent->power.sleeping) || all_sleeping) {
+ if (dev->parent->power.sleeping)
+ dev_warn(dev,
+ "parent %s is sleeping, will not add\n",
+ dev->parent->bus_id);
+ else
+ dev_warn(dev, "devices are sleeping, will not add\n");
+ WARN_ON(true);
+ error = -EBUSY;
+ } else {
+ error = dpm_sysfs_add(dev);
+ if (!error)
+ list_add_tail(&dev->power.entry, &dpm_active);
+ }
+ mutex_unlock(&dpm_list_mtx);
return error;
}
-void device_pm_remove(struct device * dev)
+/**
+ * device_pm_remove - remove a device from the list of active devices
+ * @dev: Device to be removed from the list
+ *
+ * This function also removes the device's PM-related sysfs attributes.
+ */
+void device_pm_remove(struct device *dev)
{
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
- down(&dpm_list_sem);
+ mutex_lock(&dpm_list_mtx);
dpm_sysfs_remove(dev);
- put_device(dev->power.pm_parent);
list_del_init(&dev->power.entry);
- up(&dpm_list_sem);
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/*------------------------- Resume routines -------------------------*/
+
+/**
+ * resume_device_early - Power on one device (early resume).
+ * @dev: Device.
+ *
+ * Must be called with interrupts disabled.
+ */
+static int resume_device_early(struct device *dev)
+{
+ int error = 0;
+
+ TRACE_DEVICE(dev);
+ TRACE_RESUME(0);
+
+ if (dev->bus && dev->bus->resume_early) {
+ dev_dbg(dev, "EARLY resume\n");
+ error = dev->bus->resume_early(dev);
+ }
+
+ TRACE_RESUME(error);
+ return error;
+}
+
+/**
+ * dpm_power_up - Power on all regular (non-sysdev) devices.
+ *
+ * Walk the dpm_off_irq list and power each device up. This
+ * is used for devices that required they be powered down with
+ * interrupts disabled. As devices are powered on, they are moved
+ * to the dpm_off list.
+ *
+ * Must be called with interrupts disabled and only one CPU running.
+ */
+static void dpm_power_up(void)
+{
+
+ while (!list_empty(&dpm_off_irq)) {
+ struct list_head *entry = dpm_off_irq.next;
+ struct device *dev = to_device(entry);
+
+ list_move_tail(entry, &dpm_off);
+ resume_device_early(dev);
+ }
+}
+
+/**
+ * device_power_up - Turn on all devices that need special attention.
+ *
+ * Power on system devices, then devices that required we shut them down
+ * with interrupts disabled.
+ *
+ * Must be called with interrupts disabled.
+ */
+void device_power_up(void)
+{
+ sysdev_resume();
+ dpm_power_up();
}
+EXPORT_SYMBOL_GPL(device_power_up);
+
+/**
+ * resume_device - Restore state for one device.
+ * @dev: Device.
+ *
+ */
+static int resume_device(struct device *dev)
+{
+ int error = 0;
+
+ TRACE_DEVICE(dev);
+ TRACE_RESUME(0);
+
+ down(&dev->sem);
+
+ if (dev->bus && dev->bus->resume) {
+ dev_dbg(dev,"resuming\n");
+ error = dev->bus->resume(dev);
+ }
+ if (!error && dev->type && dev->type->resume) {
+ dev_dbg(dev,"resuming\n");
+ error = dev->type->resume(dev);
+ }
+ if (!error && dev->class && dev->class->resume) {
+ dev_dbg(dev,"class resume\n");
+ error = dev->class->resume(dev);
+ }
+
+ up(&dev->sem);
+
+ TRACE_RESUME(error);
+ return error;
+}
+
+/**
+ * dpm_resume - Resume every device.
+ *
+ * Resume the devices that have either not gone through
+ * the late suspend, or that did go through it but also
+ * went through the early resume.
+ *
+ * Take devices from the dpm_off_list, resume them,
+ * and put them on the dpm_locked list.
+ */
+static void dpm_resume(void)
+{
+ mutex_lock(&dpm_list_mtx);
+ all_sleeping = false;
+ while(!list_empty(&dpm_off)) {
+ struct list_head *entry = dpm_off.next;
+ struct device *dev = to_device(entry);
+
+ list_move_tail(entry, &dpm_active);
+ dev->power.sleeping = false;
+ mutex_unlock(&dpm_list_mtx);
+ resume_device(dev);
+ mutex_lock(&dpm_list_mtx);
+ }
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
+ * device_resume - Restore state of each device in system.
+ *
+ * Resume all the devices, unlock them all, and allow new
+ * devices to be registered once again.
+ */
+void device_resume(void)
+{
+ might_sleep();
+ dpm_resume();
+}
+EXPORT_SYMBOL_GPL(device_resume);
+
+
+/*------------------------- Suspend routines -------------------------*/
+
+static inline char *suspend_verb(u32 event)
+{
+ switch (event) {
+ case PM_EVENT_SUSPEND: return "suspend";
+ case PM_EVENT_FREEZE: return "freeze";
+ case PM_EVENT_PRETHAW: return "prethaw";
+ default: return "(unknown suspend event)";
+ }
+}
+
+static void
+suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
+{
+ dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
+ ((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
+ ", may wakeup" : "");
+}
+
+/**
+ * suspend_device_late - Shut down one device (late suspend).
+ * @dev: Device.
+ * @state: Power state device is entering.
+ *
+ * This is called with interrupts off and only a single CPU running.
+ */
+static int suspend_device_late(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ if (dev->bus && dev->bus->suspend_late) {
+ suspend_device_dbg(dev, state, "LATE ");
+ error = dev->bus->suspend_late(dev, state);
+ suspend_report_result(dev->bus->suspend_late, error);
+ }
+ return error;
+}
+
+/**
+ * device_power_down - Shut down special devices.
+ * @state: Power state to enter.
+ *
+ * Power down devices that require interrupts to be disabled
+ * and move them from the dpm_off list to the dpm_off_irq list.
+ * Then power down system devices.
+ *
+ * Must be called with interrupts disabled and only one CPU running.
+ */
+int device_power_down(pm_message_t state)
+{
+ int error = 0;
+
+ while (!list_empty(&dpm_off)) {
+ struct list_head *entry = dpm_off.prev;
+ struct device *dev = to_device(entry);
+
+ error = suspend_device_late(dev, state);
+ if (error) {
+ printk(KERN_ERR "Could not power down device %s: "
+ "error %d\n",
+ kobject_name(&dev->kobj), error);
+ break;
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &dpm_off_irq);
+ }
+
+ if (!error)
+ error = sysdev_suspend(state);
+ if (error)
+ dpm_power_up();
+ return error;
+}
+EXPORT_SYMBOL_GPL(device_power_down);
+
+/**
+ * suspend_device - Save state of one device.
+ * @dev: Device.
+ * @state: Power state device is entering.
+ */
+static int suspend_device(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ down(&dev->sem);
+
+ if (dev->class && dev->class->suspend) {
+ suspend_device_dbg(dev, state, "class ");
+ error = dev->class->suspend(dev, state);
+ suspend_report_result(dev->class->suspend, error);
+ }
+
+ if (!error && dev->type && dev->type->suspend) {
+ suspend_device_dbg(dev, state, "type ");
+ error = dev->type->suspend(dev, state);
+ suspend_report_result(dev->type->suspend, error);
+ }
+
+ if (!error && dev->bus && dev->bus->suspend) {
+ suspend_device_dbg(dev, state, "");
+ error = dev->bus->suspend(dev, state);
+ suspend_report_result(dev->bus->suspend, error);
+ }
+
+ up(&dev->sem);
+
+ return error;
+}
+
+/**
+ * dpm_suspend - Suspend every device.
+ * @state: Power state to put each device in.
+ *
+ * Walk the dpm_locked list. Suspend each device and move it
+ * to the dpm_off list.
+ *
+ * (For historical reasons, if it returns -EAGAIN, that used to mean
+ * that the device would be called again with interrupts disabled.
+ * These days, we use the "suspend_late()" callback for that, so we
+ * print a warning and consider it an error).
+ */
+static int dpm_suspend(pm_message_t state)
+{
+ int error = 0;
+
+ mutex_lock(&dpm_list_mtx);
+ while (!list_empty(&dpm_active)) {
+ struct list_head *entry = dpm_active.prev;
+ struct device *dev = to_device(entry);
+
+ WARN_ON(dev->parent && dev->parent->power.sleeping);
+
+ dev->power.sleeping = true;
+ mutex_unlock(&dpm_list_mtx);
+ error = suspend_device(dev, state);
+ mutex_lock(&dpm_list_mtx);
+ if (error) {
+ printk(KERN_ERR "Could not suspend device %s: "
+ "error %d%s\n",
+ kobject_name(&dev->kobj),
+ error,
+ (error == -EAGAIN ?
+ " (please convert to suspend_late)" :
+ ""));
+ dev->power.sleeping = false;
+ break;
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &dpm_off);
+ }
+ if (!error)
+ all_sleeping = true;
+ mutex_unlock(&dpm_list_mtx);
+
+ return error;
+}
+
+/**
+ * device_suspend - Save state and stop all devices in system.
+ * @state: new power management state
+ *
+ * Prevent new devices from being registered, then lock all devices
+ * and suspend them.
+ */
+int device_suspend(pm_message_t state)
+{
+ int error;
+
+ might_sleep();
+ error = dpm_suspend(state);
+ if (error)
+ device_resume();
+ return error;
+}
+EXPORT_SYMBOL_GPL(device_suspend);
+
+void __suspend_report_result(const char *function, void *fn, int ret)
+{
+ if (ret) {
+ printk(KERN_ERR "%s(): ", function);
+ print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
+ printk("%d\n", ret);
+ }
+}
+EXPORT_SYMBOL_GPL(__suspend_report_result);
projects / linux-2.6-omap-h63xx.git / blobdiff