ide: delkin_cb: use generic power management

With the support of generic PM callbacks, drivers no longer need to use
legacy .suspend() and .resume() in which they had to maintain PCI states
changes and device's power state themselves. All required operations are
done by PCI core.

After converting it into generic model, suspend() became an empty function.
Hence, it is defined as NULL.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/ide/delkin_cb.c b/drivers/ide/delkin_cb.c
index 300daab..a711b64 100644
--- a/drivers/ide/delkin_cb.c
+++ b/drivers/ide/delkin_cb.c
@@ -123,39 +123,18 @@
 	pci_disable_device(dev);
 }
 
-#ifdef CONFIG_PM
-static int delkin_cb_suspend(struct pci_dev *dev, pm_message_t state)
-{
-	pci_save_state(dev);
-	pci_disable_device(dev);
-	pci_set_power_state(dev, pci_choose_state(dev, state));
+#define delkin_cb_suspend NULL
 
-	return 0;
-}
-
-static int delkin_cb_resume(struct pci_dev *dev)
+static int __maybe_unused delkin_cb_resume(struct device *dev_d)
 {
+	struct pci_dev *dev = to_pci_dev(dev_d);
 	struct ide_host *host = pci_get_drvdata(dev);
-	int rc;
-
-	pci_set_power_state(dev, PCI_D0);
-
-	rc = pci_enable_device(dev);
-	if (rc)
-		return rc;
-
-	pci_restore_state(dev);
-	pci_set_master(dev);
 
 	if (host->init_chipset)
 		host->init_chipset(dev);
 
 	return 0;
 }
-#else
-#define delkin_cb_suspend NULL
-#define delkin_cb_resume NULL
-#endif
 
 static struct pci_device_id delkin_cb_pci_tbl[] = {
 	{ 0x1145, 0xf021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
@@ -164,13 +143,14 @@
 };
 MODULE_DEVICE_TABLE(pci, delkin_cb_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(delkin_cb_pm_ops, delkin_cb_suspend, delkin_cb_resume);
+
 static struct pci_driver delkin_cb_pci_driver = {
 	.name		= "Delkin-ASKA-Workbit Cardbus IDE",
 	.id_table	= delkin_cb_pci_tbl,
 	.probe		= delkin_cb_probe,
 	.remove		= delkin_cb_remove,
-	.suspend	= delkin_cb_suspend,
-	.resume		= delkin_cb_resume,
+	.driver.pm	= &delkin_cb_pm_ops,
 };
 
 module_pci_driver(delkin_cb_pci_driver);