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usb: gadget: s3c-hsotg: add proper suspend/resume support

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This patch adds suspend/resume support to s3c-hsotg driver. It makes UDC
driver more power efficient.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Marek Szyprowski 2014-02-28 13:06:11 +01:00 • committed by Felipe Balbi
commit b83e333a4d
1 changed files with 49 additions and 4 deletions
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53
drivers/usb/gadget/s3c-hsotg.c
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@ -3774,10 +3774,55 @@ static int s3c_hsotg_remove(struct platform_device *pdev)
return 0; return 0;
} }
#if 1 static int s3c_hsotg_suspend(struct platform_device *pdev, pm_message_t state)
#define s3c_hsotg_suspend NULL {
#define s3c_hsotg_resume NULL struct s3c_hsotg *hsotg = platform_get_drvdata(pdev);
#endif unsigned long flags;
int ret = 0;
if (hsotg->driver)
dev_info(hsotg->dev, "suspending usb gadget %s\n",
hsotg->driver->driver.name);
spin_lock_irqsave(&hsotg->lock, flags);
s3c_hsotg_disconnect(hsotg);
s3c_hsotg_phy_disable(hsotg);
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
spin_unlock_irqrestore(&hsotg->lock, flags);
if (hsotg->driver) {
int ep;
for (ep = 0; ep < hsotg->num_of_eps; ep++)
s3c_hsotg_ep_disable(&hsotg->eps[ep].ep);
ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
}
return ret;
}
static int s3c_hsotg_resume(struct platform_device *pdev)
{
struct s3c_hsotg *hsotg = platform_get_drvdata(pdev);
unsigned long flags;
int ret = 0;
if (hsotg->driver) {
dev_info(hsotg->dev, "resuming usb gadget %s\n",
hsotg->driver->driver.name);
ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
}
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->last_rst = jiffies;
s3c_hsotg_phy_enable(hsotg);
s3c_hsotg_core_init(hsotg);
spin_unlock_irqrestore(&hsotg->lock, flags);
return ret;
}
#ifdef CONFIG_OF #ifdef CONFIG_OF
static const struct of_device_id s3c_hsotg_of_ids[] = { static const struct of_device_id s3c_hsotg_of_ids[] = {