[RFC][PATCH 1/4] ahci: port legacy pm interface to struct dev_pm_ops

[Lin Ming <ming.m.lin@xxxxxxxxx>]

So we can add runtime pm callbacks later.

Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx>
---
 drivers/ata/ahci.c |   61 +++++++++++++++++++++++++++++++++++-----------------
 1 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index cf26222..c745603 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -84,8 +84,9 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
 static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
 				unsigned long deadline);
 #ifdef CONFIG_PM
-static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
-static int ahci_pci_device_resume(struct pci_dev *pdev);
+static int ahci_pci_device_suspend(struct device *dev);
+static int ahci_pci_device_hibernate(struct device *dev);
+static int ahci_pci_device_resume(struct device *dev);
 #endif
 
 static struct scsi_host_template ahci_sht = {
@@ -400,6 +401,11 @@ static const struct pci_device_id ahci_pci_tbl[] = {
 	{ }	/* terminate list */
 };
 
+static struct dev_pm_ops ahci_pci_pm_ops = {
+	.suspend		= ahci_pci_device_suspend,
+	.resume			= ahci_pci_device_resume,
+	.poweroff		= ahci_pci_device_hibernate,
+};
 
 static struct pci_driver ahci_pci_driver = {
 	.name			= DRV_NAME,
@@ -407,8 +413,9 @@ static struct pci_driver ahci_pci_driver = {
 	.probe			= ahci_init_one,
 	.remove			= ata_pci_remove_one,
 #ifdef CONFIG_PM
-	.suspend		= ahci_pci_device_suspend,
-	.resume			= ahci_pci_device_resume,
+	.driver			= {
+		.pm = &ahci_pci_pm_ops
+	},
 #endif
 };
 
@@ -567,37 +574,51 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
 }
 
 #ifdef CONFIG_PM
-static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+static int ahci_pci_device_suspend_common(struct pci_dev *pdev, pm_message_t mesg)
 {
 	struct ata_host *host = dev_get_drvdata(&pdev->dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	void __iomem *mmio = hpriv->mmio;
 	u32 ctl;
 
-	if (mesg.event & PM_EVENT_SUSPEND &&
-	    hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
+	/* AHCI spec rev1.1 section 8.3.3:
+	 * Software must disable interrupts prior to requesting a
+	 * transition of the HBA to D3 state.
+	 */
+	ctl = readl(mmio + HOST_CTL);
+	ctl &= ~HOST_IRQ_EN;
+	writel(ctl, mmio + HOST_CTL);
+	readl(mmio + HOST_CTL); /* flush */
+
+	return ata_pci_device_suspend(pdev, mesg);
+}
+
+static int ahci_pci_device_suspend(struct device *dev)
+{
+	struct ata_host *host = dev_get_drvdata(dev);
+	struct ahci_host_priv *hpriv = host->private_data;
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 		dev_err(&pdev->dev,
 			"BIOS update required for suspend/resume\n");
 		return -EIO;
 	}
 
-	if (mesg.event & PM_EVENT_SLEEP) {
-		/* AHCI spec rev1.1 section 8.3.3:
-		 * Software must disable interrupts prior to requesting a
-		 * transition of the HBA to D3 state.
-		 */
-		ctl = readl(mmio + HOST_CTL);
-		ctl &= ~HOST_IRQ_EN;
-		writel(ctl, mmio + HOST_CTL);
-		readl(mmio + HOST_CTL); /* flush */
-	}
+	return ahci_pci_device_suspend_common(pdev, PMSG_SUSPEND);
+}
 
-	return ata_pci_device_suspend(pdev, mesg);
+static int ahci_pci_device_hibernate(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	return ahci_pci_device_suspend_common(pdev, PMSG_HIBERNATE);
 }
 
-static int ahci_pci_device_resume(struct pci_dev *pdev)
+static int ahci_pci_device_resume(struct device *dev)
 {
-	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+	struct ata_host *host = dev_get_drvdata(dev);
+	struct pci_dev *pdev = to_pci_dev(dev);
 	int rc;
 
 	rc = ata_pci_device_do_resume(pdev);
-- 
1.7.2.5

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