2 files changed, 29 insertions, 0 deletions

diff --git a/arch/x86/include/asm/intel_scu_ipc.h b/arch/x86/include/asm/intel_scu_ipc.h
index 29f66793cc55..4420993acc47 100644
--- a/arch/x86/include/asm/intel_scu_ipc.h
+++ b/arch/x86/include/asm/intel_scu_ipc.h
@@ -1,6 +1,8 @@
 #ifndef _ASM_X86_INTEL_SCU_IPC_H_
 #define  _ASM_X86_INTEL_SCU_IPC_H_
 
+#include <linux/notifier.h>
+
 #define IPCMSG_VRTC     0xFA     /* Set vRTC device */
 
 /* Command id associated with message IPCMSG_VRTC */
@@ -44,4 +46,24 @@ int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data);
 /* Update FW version */
 int intel_scu_ipc_fw_update(u8 *buffer, u32 length);
 
+extern struct blocking_notifier_head intel_scu_notifier;
+
+static inline void intel_scu_notifier_add(struct notifier_block *nb)
+{
+        blocking_notifier_chain_register(&intel_scu_notifier, nb);
+}
+
+static inline void intel_scu_notifier_remove(struct notifier_block *nb)
+{
+        blocking_notifier_chain_unregister(&intel_scu_notifier, nb);
+}
+
+static inline int intel_scu_notifier_post(unsigned long v, void *p)
+{
+        return blocking_notifier_call_chain(&intel_scu_notifier, v, p);
+}
+
+#define         SCU_AVAILABLE           1
+#define         SCU_DOWN                2
+
 #endif
diff --git a/arch/x86/platform/mrst/mrst.c b/arch/x86/platform/mrst/mrst.c
index fe73276e026b..51ec016c20d6 100644
--- a/arch/x86/platform/mrst/mrst.c
+++ b/arch/x86/platform/mrst/mrst.c
@@ -24,6 +24,7 @@
 #include <linux/platform_device.h>
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 
 #include <asm/setup.h>
 #include <asm/mpspec_def.h>
@@ -555,6 +556,9 @@ static void __init intel_scu_i2c_device_register(int bus,
         i2c_devs[i2c_next_dev++] = new_dev;
 }
 
+BLOCKING_NOTIFIER_HEAD(intel_scu_notifier);
+EXPORT_SYMBOL_GPL(intel_scu_notifier);
+
 /* Called by IPC driver */
 void intel_scu_devices_create(void)
 {
@@ -579,6 +583,7 @@ void intel_scu_devices_create(void)
                 } else
                         i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
         }
+        intel_scu_notifier_post(SCU_AVAILABLE, 0L);
 }
 EXPORT_SYMBOL_GPL(intel_scu_devices_create);
 
@@ -587,6 +592,8 @@ void intel_scu_devices_destroy(void)
 {
         int i;
 
+        intel_scu_notifier_post(SCU_DOWN, 0L);
+
         for (i = 0; i < ipc_next_dev; i++)
                 platform_device_del(ipc_devs[i]);
 }