orinoco: 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. The required operations are
done by PCI core.

PCI drivers are not expected to invoke PCI helper functions like
pci_save/restore_state(), pci_enable/disable_device(),
pci_set_power_state(), etc. Their tasks are completed by PCI core itself.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200624174048.64754-1-vaibhavgupta40@gmail.com

drivers/net/wireless/intersil/orinoco/orinoco_nortel.c

@@ -290,8 +290,7 @@ static struct pci_driver orinoco_nortel_driver = {
 	.id_table	= orinoco_nortel_id_table,
 	.probe		= orinoco_nortel_init_one,
 	.remove		= orinoco_nortel_remove_one,
-	.suspend	= orinoco_pci_suspend,
-	.resume		= orinoco_pci_resume,
+	.driver.pm	= &orinoco_pci_pm_ops,
 };
 
 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION

drivers/net/wireless/intersil/orinoco/orinoco_pci.c

@@ -230,8 +230,7 @@ static struct pci_driver orinoco_pci_driver = {
 	.id_table	= orinoco_pci_id_table,
 	.probe		= orinoco_pci_init_one,
 	.remove		= orinoco_pci_remove_one,
-	.suspend	= orinoco_pci_suspend,
-	.resume		= orinoco_pci_resume,
+	.driver.pm	= &orinoco_pci_pm_ops,
 };
 
 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION

drivers/net/wireless/intersil/orinoco/orinoco_pci.h

@@ -18,51 +18,37 @@ struct orinoco_pci_card {
 	void __iomem *attr_io;
 };
 
-#ifdef CONFIG_PM
-static int orinoco_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused orinoco_pci_suspend(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct orinoco_private *priv = pci_get_drvdata(pdev);
 
 	orinoco_down(priv);
 	free_irq(pdev->irq, priv);
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, PCI_D3hot);
 
 	return 0;
 }
 
-static int orinoco_pci_resume(struct pci_dev *pdev)
+static int __maybe_unused orinoco_pci_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct orinoco_private *priv = pci_get_drvdata(pdev);
 	struct net_device *dev = priv->ndev;
 	int err;
 
-	pci_set_power_state(pdev, PCI_D0);
-	err = pci_enable_device(pdev);
-	if (err) {
-		printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
-		       dev->name);
-		return err;
-	}
-	pci_restore_state(pdev);
-
 	err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
 			  dev->name, priv);
 	if (err) {
 		printk(KERN_ERR "%s: cannot re-allocate IRQ on resume\n",
 		       dev->name);
-		pci_disable_device(pdev);
 		return -EBUSY;
 	}
 
-	err = orinoco_up(priv);
-
-	return err;
+	return orinoco_up(priv);
 }
-#else
-#define orinoco_pci_suspend NULL
-#define orinoco_pci_resume NULL
-#endif
+
+static SIMPLE_DEV_PM_OPS(orinoco_pci_pm_ops,
+			 orinoco_pci_suspend,
+			 orinoco_pci_resume);
 
 #endif /* _ORINOCO_PCI_H */

drivers/net/wireless/intersil/orinoco/orinoco_plx.c

@@ -336,8 +336,7 @@ static struct pci_driver orinoco_plx_driver = {
 	.id_table	= orinoco_plx_id_table,
 	.probe		= orinoco_plx_init_one,
 	.remove		= orinoco_plx_remove_one,
-	.suspend	= orinoco_pci_suspend,
-	.resume		= orinoco_pci_resume,
+	.driver.pm	= &orinoco_pci_pm_ops,
 };
 
 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION

drivers/net/wireless/intersil/orinoco/orinoco_tmd.c

@@ -213,8 +213,7 @@ static struct pci_driver orinoco_tmd_driver = {
 	.id_table	= orinoco_tmd_id_table,
 	.probe		= orinoco_tmd_init_one,
 	.remove		= orinoco_tmd_remove_one,
-	.suspend	= orinoco_pci_suspend,
-	.resume		= orinoco_pci_resume,
+	.driver.pm	= &orinoco_pci_pm_ops,
 };
 
 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION