Driver core: Add offline/online device operations

[linux-imx.git] / include / linux / device.h

diff --git a/include/linux/device.h b/include/linux/device.h
index c0a12612532512bab2f792fba4b40580c48b13dd..eeb33315514c332ddf83b9fcf4183a580555bab6 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -71,6 +71,10 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  *             the specific driver's probe to initial the matched device.
  * @remove:    Called when a device removed from this bus.
  * @shutdown:  Called at shut-down time to quiesce the device.
+ *
+ * @online:    Called to put the device back online (after offlining it).
+ * @offline:   Called to put the device offline for hot-removal. May fail.
+ *
  * @suspend:   Called when a device on this bus wants to go to sleep mode.
  * @resume:    Called to bring a device on this bus out of sleep mode.
  * @pm:                Power management operations of this bus, callback the specific
@@ -104,6 +108,9 @@ struct bus_type {
        int (*remove)(struct device *dev);
        void (*shutdown)(struct device *dev);
 
+       int (*online)(struct device *dev);
+       int (*offline)(struct device *dev);
+
        int (*suspend)(struct device *dev, pm_message_t state);
        int (*resume)(struct device *dev);
 
@@ -648,6 +655,8 @@ struct acpi_dev_node {
  * @release:   Callback to free the device after all references have
  *             gone away. This should be set by the allocator of the
  *             device (i.e. the bus driver that discovered the device).
+ * @offline_disabled: If set, the device is permanently online.
+ * @offline:   Set after successful invocation of bus type's .offline().
  *
  * At the lowest level, every device in a Linux system is represented by an
  * instance of struct device. The device structure contains the information
@@ -720,6 +729,9 @@ struct device {
 
        void    (*release)(struct device *dev);
        struct iommu_group      *iommu_group;
+
+       bool                    offline_disabled:1;
+       bool                    offline:1;
 };
 
 static inline struct device *kobj_to_dev(struct kobject *kobj)
@@ -856,6 +868,15 @@ extern const char *device_get_devnode(struct device *dev,
 extern void *dev_get_drvdata(const struct device *dev);
 extern int dev_set_drvdata(struct device *dev, void *data);
 
+static inline bool device_supports_offline(struct device *dev)
+{
+       return dev->bus && dev->bus->offline && dev->bus->online;
+}
+
+extern void lock_device_hotplug(void);
+extern void unlock_device_hotplug(void);
+extern int device_offline(struct device *dev);
+extern int device_online(struct device *dev);
 /*
  * Root device objects for grouping under /sys/devices
  */