memstick: add memstick_suspend/resume_host methods

Bus driver may need to be informed that host is being suspended/resumed.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/memstick/core/memstick.c

@@ -561,6 +561,31 @@ void memstick_free_host(struct memstick_host *host)
 }
 EXPORT_SYMBOL(memstick_free_host);
 
+/**
+ * memstick_suspend_host - notify bus driver of host suspension
+ * @host - host to use
+ */
+void memstick_suspend_host(struct memstick_host *host)
+{
+	mutex_lock(&host->lock);
+	host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
+	mutex_unlock(&host->lock);
+}
+EXPORT_SYMBOL(memstick_suspend_host);
+
+/**
+ * memstick_resume_host - notify bus driver of host resumption
+ * @host - host to use
+ */
+void memstick_resume_host(struct memstick_host *host)
+{
+	mutex_lock(&host->lock);
+	host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_ON);
+	mutex_unlock(&host->lock);
+	memstick_detect_change(host);
+}
+EXPORT_SYMBOL(memstick_resume_host);
+
 int memstick_register_driver(struct memstick_driver *drv)
 {
 	drv->driver.bus = &memstick_bus_type;

drivers/memstick/host/tifm_ms.c

@@ -627,17 +627,17 @@ static void tifm_ms_remove(struct tifm_dev *sock)
 
 static int tifm_ms_suspend(struct tifm_dev *sock, pm_message_t state)
 {
+	struct memstick_host *msh = tifm_get_drvdata(sock);
+
+	memstick_suspend_host(msh);
 	return 0;
 }
 
 static int tifm_ms_resume(struct tifm_dev *sock)
 {
 	struct memstick_host *msh = tifm_get_drvdata(sock);
-	struct tifm_ms *host = memstick_priv(msh);
-
-	tifm_ms_initialize_host(host);
-	memstick_detect_change(msh);
 
+	memstick_resume_host(msh);
 	return 0;
 }
 

include/linux/memstick.h

@@ -312,6 +312,8 @@ int memstick_add_host(struct memstick_host *host);
 void memstick_remove_host(struct memstick_host *host);
 void memstick_free_host(struct memstick_host *host);
 void memstick_detect_change(struct memstick_host *host);
+void memstick_suspend_host(struct memstick_host *host);
+void memstick_resume_host(struct memstick_host *host);
 
 void memstick_init_req_sg(struct memstick_request *mrq, unsigned char tpc,
 			  struct scatterlist *sg);