[PATCH v2 18/25] usb: langwell_udc: add runtime pm framework support

[Hao Wu <hao.wu@xxxxxxxxx>]

From: Jiebing Li <jiebing.li@xxxxxxxxx>

This patch adds runtime pm framework for langwell_udc controller driver.
The actul implementation on runtime_suspend/resume will be added in
another patch.

Signed-off-by: Jiebing Li <jiebing.li@xxxxxxxxx>
Signed-off-by: Hao Wu <hao.wu@xxxxxxxxx>
---
 drivers/usb/gadget/langwell_udc.c |   52 +++++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index 2c56faf..8f17d16 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -2761,6 +2761,9 @@ static void handle_bus_suspend(struct langwell_udc *dev)
 {
 	dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
 
+	if (dev->usb_state == USB_STATE_SUSPENDED)
+		return;
+
 	dev->resume_state = dev->usb_state;
 	dev->usb_state = USB_STATE_SUSPENDED;
 
@@ -2777,6 +2780,8 @@ static void handle_bus_suspend(struct langwell_udc *dev)
 		}
 	}
 
+	pm_runtime_put(&dev->pdev->dev);
+
 	/* enter PHY low power suspend */
 	langwell_phy_low_power(dev, 1);
 
@@ -2807,6 +2812,8 @@ static void handle_bus_resume(struct langwell_udc *dev)
 		}
 	}
 
+	pm_runtime_get(&dev->pdev->dev);
+
 	dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
 }
 
@@ -3449,6 +3456,42 @@ static int langwell_udc_resume(struct pci_dev *pdev)
 }
 
 
+#ifdef CONFIG_PM_RUNTIME
+/* device controller runtime suspend */
+static int langwell_udc_runtime_suspend(struct device *device)
+{
+	struct langwell_udc	*dev = the_controller;
+
+	dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
+
+	/* TODO: queue flush and SRAM release */
+
+	dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* device controller runtime resume */
+static int langwell_udc_runtime_resume(struct device *device)
+{
+	struct langwell_udc	*dev = the_controller;
+
+	dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
+
+	/* TODO: queue re-enable and SRAM resume */
+
+	dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+#else
+
+#define langwell_udc_runtime_suspend NULL
+#define langwell_udc_runtime_resume NULL
+
+#endif
+
+
 /* pci driver shutdown */
 static void langwell_udc_shutdown(struct pci_dev *pdev)
 {
@@ -3488,7 +3531,16 @@ static const struct pci_device_id pci_ids[] = { {
 MODULE_DEVICE_TABLE(pci, pci_ids);
 
 
+static const struct dev_pm_ops langwell_udc_pm_ops = {
+	.runtime_suspend = langwell_udc_runtime_suspend,
+	.runtime_resume = langwell_udc_runtime_resume,
+};
+
+
 static struct pci_driver langwell_pci_driver = {
+	.driver	=	{
+		.pm = &langwell_udc_pm_ops,
+	},
 	.name =		(char *) driver_name,
 	.id_table =	pci_ids,
 
-- 
1.6.0.6

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html