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From:   Vaibhav Gupta <vaibhavgupta40@gmail.com>
To:     Bjorn Helgaas <helgaas@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Bjorn Helgaas <bjorn@helgaas.com>,
        Vaibhav Gupta <vaibhav.varodek@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kalle Valo <kvalo@codeaurora.org>
Cc:     Vaibhav Gupta <vaibhavgupta40@gmail.com>,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        Shuah Khan <skhan@linuxfoundation.org>, netdev@vger.kernel.org,
        linux-wireless@vger.kernel.org
Subject: [PATCH v1] prism54: islpci_hotplug: use generic power management
Date:   Tue, 21 Jul 2020 18:25:15 +0530
Message-Id: <20200721125514.145607-1-vaibhavgupta40@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Drivers using legacy power management .suspen()/.resume() callbacks
have to manage PCI states and device's PM states themselves. They also
need to take care of standard configuration registers.

Switch to generic power management framework using a single
"struct dev_pm_ops" variable to take the unnecessary load from the driver.
This also avoids the need for the driver to directly call most of the PCI
helper functions and device power state control functions as through
the generic framework, PCI Core takes care of the necessary operations,
and drivers are required to do only device-specific jobs.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 .../intersil/prism54/islpci_hotplug.c         | 34 ++++++-------------
 1 file changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
index 20291c0d962d..e8369befe100 100644
--- a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
+++ b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
@@ -63,16 +63,17 @@ MODULE_DEVICE_TABLE(pci, prism54_id_tbl);
 
 static int prism54_probe(struct pci_dev *, const struct pci_device_id *);
 static void prism54_remove(struct pci_dev *);
-static int prism54_suspend(struct pci_dev *, pm_message_t state);
-static int prism54_resume(struct pci_dev *);
+static int __maybe_unused prism54_suspend(struct device *);
+static int __maybe_unused prism54_resume(struct device *);
+
+static SIMPLE_DEV_PM_OPS(prism54_pm_ops, prism54_suspend, prism54_resume);
 
 static struct pci_driver prism54_driver = {
 	.name = DRV_NAME,
 	.id_table = prism54_id_tbl,
 	.probe = prism54_probe,
 	.remove = prism54_remove,
-	.suspend = prism54_suspend,
-	.resume = prism54_resume,
+	.driver.pm = &prism54_pm_ops,
 };
 
 /******************************************************************************
@@ -243,16 +244,13 @@ prism54_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-static int
-prism54_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused
+prism54_suspend(struct device *dev)
 {
-	struct net_device *ndev = pci_get_drvdata(pdev);
+	struct net_device *ndev = dev_get_drvdata(dev);
 	islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 	BUG_ON(!priv);
 
-
-	pci_save_state(pdev);
-
 	/* tell the device not to trigger interrupts for now... */
 	isl38xx_disable_interrupts(priv->device_base);
 
@@ -266,26 +264,16 @@ prism54_suspend(struct pci_dev *pdev, pm_message_t state)
 	return 0;
 }
 
-static int
-prism54_resume(struct pci_dev *pdev)
+static int __maybe_unused
+prism54_resume(struct device *dev)
 {
-	struct net_device *ndev = pci_get_drvdata(pdev);
+	struct net_device *ndev = dev_get_drvdata(dev);
 	islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
-	int err;
 
 	BUG_ON(!priv);
 
 	printk(KERN_NOTICE "%s: got resume request\n", ndev->name);
 
-	err = pci_enable_device(pdev);
-	if (err) {
-		printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
-		       ndev->name);
-		return err;
-	}
-
-	pci_restore_state(pdev);
-
 	/* alright let's go into the PREBOOT state */
 	islpci_reset(priv, 1);
 
-- 
2.27.0