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USB: ohci-s3c2410: add PM support

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This patch adds power management support such as suspend and resume
functions.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jingoo Han 2011-11-28 15:56:06 +09:00 committed by Greg Kroah-Hartman
parent cc27c96c2b
commit b870defebd
1 changed files with 53 additions and 2 deletions
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55
drivers/usb/host/ohci-s3c2410.c
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@ -486,15 +486,66 @@ static int __devexit ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct platform_device *pdev = to_platform_device(dev);
unsigned long flags;
int rc = 0;
/*
* Root hub was already suspended. Disable irq emission and
* mark HW unaccessible, bail out if RH has been resumed. Use
* the spinlock to properly synchronize with possible pending
* RH suspend or resume activity.
*/
spin_lock_irqsave(&ohci->lock, flags);
if (ohci->rh_state != OHCI_RH_SUSPENDED) {
rc = -EINVAL;
goto bail;
}
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
s3c2410_stop_hc(pdev);
bail:
spin_unlock_irqrestore(&ohci->lock, flags);
return rc;
}
static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct platform_device *pdev = to_platform_device(dev);
s3c2410_start_hc(pdev, hcd);
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
ohci_finish_controller_resume(hcd);
return 0;
}
#else
#define ohci_hcd_s3c2410_drv_suspend NULL
#define ohci_hcd_s3c2410_drv_resume NULL
#endif
static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
.suspend = ohci_hcd_s3c2410_drv_suspend,
.resume = ohci_hcd_s3c2410_drv_resume,
};
static struct platform_driver ohci_hcd_s3c2410_driver = {
.probe = ohci_hcd_s3c2410_drv_probe,
.remove = __devexit_p(ohci_hcd_s3c2410_drv_remove),
.shutdown = usb_hcd_platform_shutdown,
/*.suspend = ohci_hcd_s3c2410_drv_suspend, */
/*.resume = ohci_hcd_s3c2410_drv_resume, */
.driver = {
.owner = THIS_MODULE,
.name = "s3c2410-ohci",
.pm = &ohci_hcd_s3c2410_pm_ops,
},
};