mg_disk: Use struct dev_pm_ops for power management

Make the mg_disk driver define its PM callbacks through
a struct dev_pm_ops object rather than by using legacy PM hooks
in struct platform_driver.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

drivers/block/mg_disk.c

@@ -780,9 +780,9 @@ static const struct block_device_operations mg_disk_ops = {
 	.getgeo = mg_getgeo
 };
 
-static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
+static int mg_suspend(struct device *dev)
 {
-	struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
+	struct mg_drv_data *prv_data = dev->platform_data;
 	struct mg_host *host = prv_data->host;
 
 	if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
@@ -804,9 +804,9 @@ static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
 	return 0;
 }
 
-static int mg_resume(struct platform_device *plat_dev)
+static int mg_resume(struct device *dev)
 {
-	struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
+	struct mg_drv_data *prv_data = dev->platform_data;
 	struct mg_host *host = prv_data->host;
 
 	if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
@@ -825,6 +825,8 @@ static int mg_resume(struct platform_device *plat_dev)
 	return 0;
 }
 
+static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
+
 static int mg_probe(struct platform_device *plat_dev)
 {
 	struct mg_host *host;
@@ -1074,11 +1076,10 @@ static int mg_remove(struct platform_device *plat_dev)
 static struct platform_driver mg_disk_driver = {
 	.probe = mg_probe,
 	.remove = mg_remove,
-	.suspend = mg_suspend,
-	.resume = mg_resume,
 	.driver = {
 		.name = MG_DEV_NAME,
 		.owner = THIS_MODULE,
+		.pm = &mg_pm,
 	}
 };