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authorLen Brown <len.brown@intel.com>2005-12-06 17:31:30 -0500
committerLen Brown <len.brown@intel.com>2005-12-06 17:31:30 -0500
commit3d5271f9883cba7b54762bc4fe027d4172f06db7 (patch)
treeab8a881a14478598a0c8bda0d26c62cdccfffd6d /drivers/base/power
parent378b2556f4e09fa6f87ff0cb5c4395ff28257d02 (diff)
parent9115a6c787596e687df03010d97fccc5e0762506 (diff)
Pull release into acpica branch
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/main.c26
-rw-r--r--drivers/base/power/power.h13
-rw-r--r--drivers/base/power/runtime.c1
-rw-r--r--drivers/base/power/sysfs.c74
4 files changed, 78 insertions, 36 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 15e6a8f951f..0d2e101e4f1 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -30,23 +30,6 @@ LIST_HEAD(dpm_off_irq);
DECLARE_MUTEX(dpm_sem);
DECLARE_MUTEX(dpm_list_sem);
-/*
- * PM Reference Counting.
- */
-
-static inline void device_pm_hold(struct device * dev)
-{
- if (dev)
- atomic_inc(&dev->power.pm_users);
-}
-
-static inline void device_pm_release(struct device * dev)
-{
- if (dev)
- atomic_dec(&dev->power.pm_users);
-}
-
-
/**
* device_pm_set_parent - Specify power dependency.
* @dev: Device who needs power.
@@ -62,10 +45,8 @@ static inline void device_pm_release(struct device * dev)
void device_pm_set_parent(struct device * dev, struct device * parent)
{
- struct device * old_parent = dev->power.pm_parent;
- device_pm_release(old_parent);
- dev->power.pm_parent = parent;
- device_pm_hold(parent);
+ put_device(dev->power.pm_parent);
+ dev->power.pm_parent = get_device(parent);
}
EXPORT_SYMBOL_GPL(device_pm_set_parent);
@@ -75,7 +56,6 @@ int device_pm_add(struct device * dev)
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus", dev->kobj.name);
- atomic_set(&dev->power.pm_users, 0);
down(&dpm_list_sem);
list_add_tail(&dev->power.entry, &dpm_active);
device_pm_set_parent(dev, dev->parent);
@@ -91,7 +71,7 @@ void device_pm_remove(struct device * dev)
dev->bus ? dev->bus->name : "No Bus", dev->kobj.name);
down(&dpm_list_sem);
dpm_sysfs_remove(dev);
- device_pm_release(dev->power.pm_parent);
+ put_device(dev->power.pm_parent);
list_del_init(&dev->power.entry);
up(&dpm_list_sem);
}
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 2e700d795cf..fb3d35a9e10 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -67,9 +67,6 @@ extern int suspend_device(struct device *, pm_message_t);
* runtime.c
*/
-extern int dpm_runtime_suspend(struct device *, pm_message_t);
-extern void dpm_runtime_resume(struct device *);
-
#else /* CONFIG_PM */
@@ -82,14 +79,4 @@ static inline void device_pm_remove(struct device * dev)
}
-static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state)
-{
- return 0;
-}
-
-static inline void dpm_runtime_resume(struct device * dev)
-{
-
-}
-
#endif
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index e8f0519f5df..adbc3148c03 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -36,6 +36,7 @@ void dpm_runtime_resume(struct device * dev)
runtime_resume(dev);
up(&dpm_sem);
}
+EXPORT_SYMBOL(dpm_runtime_resume);
/**
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 8d04fb435c1..f3a0c562bcb 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -3,6 +3,7 @@
*/
#include <linux/device.h>
+#include <linux/string.h>
#include "power.h"
@@ -48,8 +49,81 @@ static ssize_t state_store(struct device * dev, struct device_attribute *attr, c
static DEVICE_ATTR(state, 0644, state_show, state_store);
+/*
+ * 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.
+ */
+
+static const char enabled[] = "enabled";
+static const char disabled[] = "disabled";
+
+static ssize_t
+wake_show(struct device * dev, struct device_attribute *attr, char * buf)
+{
+ return sprintf(buf, "%s\n", device_can_wakeup(dev)
+ ? (device_may_wakeup(dev) ? enabled : disabled)
+ : "");
+}
+
+static ssize_t
+wake_store(struct device * dev, struct device_attribute *attr,
+ const char * buf, size_t n)
+{
+ char *cp;
+ int len = n;
+
+ if (!device_can_wakeup(dev))
+ return -EINVAL;
+
+ cp = memchr(buf, '\n', n);
+ if (cp)
+ len = cp - buf;
+ if (len == sizeof enabled - 1
+ && strncmp(buf, enabled, sizeof enabled - 1) == 0)
+ device_set_wakeup_enable(dev, 1);
+ else if (len == sizeof disabled - 1
+ && strncmp(buf, disabled, sizeof disabled - 1) == 0)
+ device_set_wakeup_enable(dev, 0);
+ else
+ return -EINVAL;
+ return n;
+}
+
+static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
+
+
static struct attribute * power_attrs[] = {
&dev_attr_state.attr,
+ &dev_attr_wakeup.attr,
NULL,
};
static struct attribute_group pm_attr_group = {