10 files changed, 222 insertions, 75 deletions

diff --git a/drivers/base/attribute_container.c b/drivers/base/attribute_container.c
index 6b2eb6f39b4d..2a7d7ae83e1e 100644
--- a/drivers/base/attribute_container.c
+++ b/drivers/base/attribute_container.c
@@ -19,6 +19,8 @@
 #include <linux/list.h>
 #include <linux/module.h>
 
+#include "base.h"
+
 /* This is a private structure used to tie the classdev and the
  * container .. it should never be visible outside this file */
 struct internal_container {
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 783752b68a9a..e3b548d46cff 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -1,3 +1,15 @@
+
+/* initialisation functions */
+
+extern int devices_init(void);
+extern int buses_init(void);
+extern int classes_init(void);
+extern int firmware_init(void);
+extern int platform_bus_init(void);
+extern int system_bus_init(void);
+extern int cpu_dev_init(void);
+extern int attribute_container_init(void);
+
 extern int bus_add_device(struct device * dev);
 extern void bus_remove_device(struct device * dev);
 
diff --git a/drivers/base/class.c b/drivers/base/class.c
index ce23dc8c18c5..c3e569730afe 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -99,7 +99,8 @@ struct class * class_get(struct class * cls)
 
 void class_put(struct class * cls)
 {
-        subsys_put(&cls->subsys);
+        if (cls)
+                subsys_put(&cls->subsys);
 }
 
 
@@ -165,14 +166,25 @@ void class_unregister(struct class * cls)
 
 static void class_create_release(struct class *cls)
 {
+        pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
         kfree(cls);
 }
 
 static void class_device_create_release(struct class_device *class_dev)
 {
+        pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
         kfree(class_dev);
 }
 
+/* needed to allow these devices to have parent class devices */
+static int class_device_create_hotplug(struct class_device *class_dev,
+                                       char **envp, int num_envp,
+                                       char *buffer, int buffer_size)
+{
+        pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
+        return 0;
+}
+
 /**
  * class_create - create a struct class structure
  * @owner: pointer to the module that is to "own" this struct class
@@ -301,10 +313,12 @@ static void class_dev_release(struct kobject * kobj)
         kfree(cd->devt_attr);
         cd->devt_attr = NULL;
 
-        if (cls->release)
+        if (cd->release)
+                cd->release(cd);
+        else if (cls->release)
                 cls->release(cd);
         else {
-                printk(KERN_ERR "Device class '%s' does not have a release() function, "
+                printk(KERN_ERR "Class Device '%s' does not have a release() function, "
                         "it is broken and must be fixed.\n",
                         cd->class_id);
                 WARN_ON(1);
@@ -382,14 +396,18 @@ static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
         buffer = &buffer[length];
         buffer_size -= length;
 
-        if (class_dev->class->hotplug) {
-                /* have the bus specific function add its stuff */
-                retval = class_dev->class->hotplug (class_dev, envp, num_envp,
-                                                    buffer, buffer_size);
-                        if (retval) {
-                        pr_debug ("%s - hotplug() returned %d\n",
-                                  __FUNCTION__, retval);
-                }
+        if (class_dev->hotplug) {
+                /* have the class device specific function add its stuff */
+                retval = class_dev->hotplug(class_dev, envp, num_envp,
+                                            buffer, buffer_size);
+                if (retval)
+                        pr_debug("class_dev->hotplug() returned %d\n", retval);
+        } else if (class_dev->class->hotplug) {
+                /* have the class specific function add its stuff */
+                retval = class_dev->class->hotplug(class_dev, envp, num_envp,
+                                                   buffer, buffer_size);
+                if (retval)
+                        pr_debug("class->hotplug() returned %d\n", retval);
         }
 
         return retval;
@@ -442,6 +460,13 @@ static ssize_t show_dev(struct class_device *class_dev, char *buf)
         return print_dev_t(buf, class_dev->devt);
 }
 
+static ssize_t store_uevent(struct class_device *class_dev,
+                            const char *buf, size_t count)
+{
+        kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
+        return count;
+}
+
 void class_device_initialize(struct class_device *class_dev)
 {
         kobj_set_kset_s(class_dev, class_obj_subsys);
@@ -469,34 +494,45 @@ static char *make_class_name(struct class_device *class_dev)
 
 int class_device_add(struct class_device *class_dev)
 {
-        struct class * parent = NULL;
-        struct class_interface * class_intf;
+        struct class *parent_class = NULL;
+        struct class_device *parent_class_dev = NULL;
+        struct class_interface *class_intf;
         char *class_name = NULL;
-        int error;
+        int error = -EINVAL;
 
         class_dev = class_device_get(class_dev);
         if (!class_dev)
                 return -EINVAL;
 
-        if (!strlen(class_dev->class_id)) {
-                error = -EINVAL;
+        if (!strlen(class_dev->class_id))
                 goto register_done;
-        }
 
-        parent = class_get(class_dev->class);
+        parent_class = class_get(class_dev->class);
+        if (!parent_class)
+                goto register_done;
+        parent_class_dev = class_device_get(class_dev->parent);
 
         pr_debug("CLASS: registering class device: ID = '%s'\n",
                  class_dev->class_id);
 
         /* first, register with generic layer. */
         kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
-        if (parent)
-                class_dev->kobj.parent = &parent->subsys.kset.kobj;
+        if (parent_class_dev)
+                class_dev->kobj.parent = &parent_class_dev->kobj;
+        else
+                class_dev->kobj.parent = &parent_class->subsys.kset.kobj;
 
-        if ((error = kobject_add(&class_dev->kobj)))
+        error = kobject_add(&class_dev->kobj);
+        if (error)
                 goto register_done;
 
         /* add the needed attributes to this device */
+        class_dev->uevent_attr.attr.name = "uevent";
+        class_dev->uevent_attr.attr.mode = S_IWUSR;
+        class_dev->uevent_attr.attr.owner = parent_class->owner;
+        class_dev->uevent_attr.store = store_uevent;
+        class_device_create_file(class_dev, &class_dev->uevent_attr);
+
         if (MAJOR(class_dev->devt)) {
                 struct class_device_attribute *attr;
                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
@@ -505,12 +541,10 @@ int class_device_add(struct class_device *class_dev)
                         kobject_del(&class_dev->kobj);
                         goto register_done;
                 }
-
                 attr->attr.name = "dev";
                 attr->attr.mode = S_IRUGO;
-                attr->attr.owner = parent->owner;
+                attr->attr.owner = parent_class->owner;
                 attr->show = show_dev;
-                attr->store = NULL;
                 class_device_create_file(class_dev, attr);
                 class_dev->devt_attr = attr;
         }
@@ -524,20 +558,23 @@ int class_device_add(struct class_device *class_dev)
                                   class_name);
         }
 
+        kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
+
         /* notify any interfaces this device is now here */
-        if (parent) {
-                down(&parent->sem);
-                list_add_tail(&class_dev->node, &parent->children);
-                list_for_each_entry(class_intf, &parent->interfaces, node)
+        if (parent_class) {
+                down(&parent_class->sem);
+                list_add_tail(&class_dev->node, &parent_class->children);
+                list_for_each_entry(class_intf, &parent_class->interfaces, node)
                         if (class_intf->add)
-                                class_intf->add(class_dev);
-                up(&parent->sem);
+                                class_intf->add(class_dev, class_intf);
+                up(&parent_class->sem);
         }
-        kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
 
  register_done:
-        if (error && parent)
-                class_put(parent);
+        if (error) {
+                class_put(parent_class);
+                class_device_put(parent_class_dev);
+        }
         class_device_put(class_dev);
         kfree(class_name);
         return error;
@@ -552,21 +589,28 @@ int class_device_register(struct class_device *class_dev)
 /**
  * class_device_create - creates a class device and registers it with sysfs
  * @cs: pointer to the struct class that this device should be registered to.
+ * @parent: pointer to the parent struct class_device of this new device, if any.
  * @dev: the dev_t for the char device to be added.
  * @device: a pointer to a struct device that is assiociated with this class device.
  * @fmt: string for the class device's name
  *
  * This function can be used by char device classes.  A struct
  * class_device will be created in sysfs, registered to the specified
- * class.  A "dev" file will be created, showing the dev_t for the
- * device.  The pointer to the struct class_device will be returned from
- * the call.  Any further sysfs files that might be required can be
- * created using this pointer.
+ * class.
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct class_device is passed in, the newly
+ * created struct class_device will be a child of that device in sysfs.
+ * The pointer to the struct class_device will be returned from the
+ * call.  Any further sysfs files that might be required can be created
+ * using this pointer.
  *
  * Note: the struct class passed to this function must have previously
  * been created with a call to class_create().
  */
-struct class_device *class_device_create(struct class *cls, dev_t devt,
+struct class_device *class_device_create(struct class *cls,
+                                         struct class_device *parent,
+                                         dev_t devt,
                                          struct device *device, char *fmt, ...)
 {
         va_list args;
@@ -585,6 +629,9 @@ struct class_device *class_device_create(struct class *cls, dev_t devt,
         class_dev->devt = devt;
         class_dev->dev = device;
         class_dev->class = cls;
+        class_dev->parent = parent;
+        class_dev->release = class_device_create_release;
+        class_dev->hotplug = class_device_create_hotplug;
 
         va_start(args, fmt);
         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
@@ -602,17 +649,18 @@ error:
 
 void class_device_del(struct class_device *class_dev)
 {
-        struct class * parent = class_dev->class;
-        struct class_interface * class_intf;
+        struct class *parent_class = class_dev->class;
+        struct class_device *parent_device = class_dev->parent;
+        struct class_interface *class_intf;
         char *class_name = NULL;
 
-        if (parent) {
-                down(&parent->sem);
+        if (parent_class) {
+                down(&parent_class->sem);
                 list_del_init(&class_dev->node);
-                list_for_each_entry(class_intf, &parent->interfaces, node)
+                list_for_each_entry(class_intf, &parent_class->interfaces, node)
                         if (class_intf->remove)
-                                class_intf->remove(class_dev);
-                up(&parent->sem);
+                                class_intf->remove(class_dev, class_intf);
+                up(&parent_class->sem);
         }
 
         if (class_dev->dev) {
@@ -620,6 +668,7 @@ void class_device_del(struct class_device *class_dev)
                 sysfs_remove_link(&class_dev->kobj, "device");
                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
         }
+        class_device_remove_file(class_dev, &class_dev->uevent_attr);
         if (class_dev->devt_attr)
                 class_device_remove_file(class_dev, class_dev->devt_attr);
         class_device_remove_attrs(class_dev);
@@ -627,8 +676,8 @@ void class_device_del(struct class_device *class_dev)
         kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE);
         kobject_del(&class_dev->kobj);
 
-        if (parent)
-                class_put(parent);
+        class_device_put(parent_device);
+        class_put(parent_class);
         kfree(class_name);
 }
 
@@ -708,7 +757,8 @@ struct class_device * class_device_get(struct class_device *class_dev)
 
 void class_device_put(struct class_device *class_dev)
 {
-        kobject_put(&class_dev->kobj);
+        if (class_dev)
+                kobject_put(&class_dev->kobj);
 }
 
 
@@ -728,7 +778,7 @@ int class_interface_register(struct class_interface *class_intf)
         list_add_tail(&class_intf->node, &parent->interfaces);
         if (class_intf->add) {
                 list_for_each_entry(class_dev, &parent->children, node)
-                        class_intf->add(class_dev);
+                        class_intf->add(class_dev, class_intf);
         }
         up(&parent->sem);
 
@@ -747,7 +797,7 @@ void class_interface_unregister(struct class_interface *class_intf)
         list_del_init(&class_intf->node);
         if (class_intf->remove) {
                 list_for_each_entry(class_dev, &parent->children, node)
-                        class_intf->remove(class_dev);
+                        class_intf->remove(class_dev, class_intf);
         }
         up(&parent->sem);
 
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 6ab73f5c799a..8615b42b517a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -154,6 +154,13 @@ static struct kset_hotplug_ops device_hotplug_ops = {
         .hotplug =      dev_hotplug,
 };
 
+static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        kobject_hotplug(&dev->kobj, KOBJ_ADD);
+        return count;
+}
+
 /**
  *      device_subsys - structure to be registered with kobject core.
  */
@@ -225,6 +232,7 @@ void device_initialize(struct device *dev)
                    klist_children_put);
         INIT_LIST_HEAD(&dev->dma_pools);
         init_MUTEX(&dev->sem);
+        device_init_wakeup(dev, 0);
 }
 
 /**
@@ -258,6 +266,14 @@ int device_add(struct device *dev)
 
         if ((error = kobject_add(&dev->kobj)))
                 goto Error;
+
+        dev->uevent_attr.attr.name = "uevent";
+        dev->uevent_attr.attr.mode = S_IWUSR;
+        if (dev->driver)
+                dev->uevent_attr.attr.owner = dev->driver->owner;
+        dev->uevent_attr.store = store_uevent;
+        device_create_file(dev, &dev->uevent_attr);
+
         kobject_hotplug(&dev->kobj, KOBJ_ADD);
         if ((error = device_pm_add(dev)))
                 goto PMError;
@@ -349,6 +365,7 @@ void device_del(struct device * dev)
 
         if (parent)
                 klist_del(&dev->knode_parent);
+        device_remove_file(dev, &dev->uevent_attr);
 
         /* Notify the platform of the removal, in case they
          * need to do anything...
@@ -390,11 +407,11 @@ static struct device * next_device(struct klist_iter * i)
 
 /**
  *      device_for_each_child - device child iterator.
- *      @dev:   parent struct device.
+ *      @parent: parent struct device.
  *      @data:  data for the callback.
  *      @fn:    function to be called for each device.
  *
- *      Iterate over @dev's child devices, and call @fn for each,
+ *      Iterate over @parent's child devices, and call @fn for each,
  *      passing it @data.
  *
  *      We check the return of @fn each time. If it returns anything
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index b79badd0f158..081c927b1ed8 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -9,6 +9,7 @@
 #include <linux/topology.h>
 #include <linux/device.h>
 
+#include "base.h"
 
 struct sysdev_class cpu_sysdev_class = {
         set_kset_name("cpu"),
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index ef3fe513e398..161f3a390d90 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -28,6 +28,7 @@ static struct device * next_device(struct klist_iter * i)
 /**
  *      driver_for_each_device - Iterator for devices bound to a driver.
  *      @drv:   Driver we're iterating.
+ *      @start: Device to begin with
  *      @data:  Data to pass to the callback.
  *      @fn:    Function to call for each device.
  *
@@ -57,7 +58,7 @@ EXPORT_SYMBOL_GPL(driver_for_each_device);
 
 /**
  * driver_find_device - device iterator for locating a particular device.
- * @driver: The device's driver
+ * @drv: The device's driver
  * @start: Device to begin with
  * @data: Data to pass to match function
  * @match: Callback function to check device
diff --git a/drivers/base/firmware.c b/drivers/base/firmware.c
index 88ab044932f2..cb1b98ae0d58 100644
--- a/drivers/base/firmware.c
+++ b/drivers/base/firmware.c
@@ -11,6 +11,9 @@
 #include <linux/kobject.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/device.h>
+
+#include "base.h"
 
 static decl_subsys(firmware, NULL, NULL);
 
diff --git a/drivers/base/init.c b/drivers/base/init.c
index a76ae5a221f3..84e604e25c4f 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -10,14 +10,8 @@
 #include <linux/device.h>
 #include <linux/init.h>
 
-extern int devices_init(void);
-extern int buses_init(void);
-extern int classes_init(void);
-extern int firmware_init(void);
-extern int platform_bus_init(void);
-extern int system_bus_init(void);
-extern int cpu_dev_init(void);
-extern int attribute_container_init(void);
+#include "base.h"
+
 /**
  *      driver_init - initialize driver model.
  *
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 361e204209eb..75ce8711bca5 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -17,6 +17,8 @@
 #include <linux/bootmem.h>
 #include <linux/err.h>
 
+#include "base.h"
+
 struct device platform_bus = {
         .bus_id         = "platform",
 };
@@ -279,13 +281,9 @@ static int platform_suspend(struct device * dev, pm_message_t state)
 {
         int ret = 0;
 
-        if (dev->driver && dev->driver->suspend) {
-                ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);
-                if (ret == 0)
-                        ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
-                if (ret == 0)
-                        ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
-        }
+        if (dev->driver && dev->driver->suspend)
+                ret = dev->driver->suspend(dev, state);
+
         return ret;
 }
 
@@ -293,13 +291,9 @@ static int platform_resume(struct device * dev)
 {
         int ret = 0;
 
-        if (dev->driver && dev->driver->resume) {
-                ret = dev->driver->resume(dev, RESUME_POWER_ON);
-                if (ret == 0)
-                        ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
-                if (ret == 0)
-                        ret = dev->driver->resume(dev, RESUME_ENABLE);
-        }
+        if (dev->driver && dev->driver->resume)
+                ret = dev->driver->resume(dev);
+
         return ret;
 }
 
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 8d04fb435c17..89c57875f3e5 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -48,8 +48,81 @@ 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 = {