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USB: gpio_vbus: wakeup support on GPIO VBUS interrupts

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We'd like to see the system waking up from the system-wide suspend
when it gets plugged-in, or the USB cable is pulled out.

Also makes it configurable via platform data 'wakeup'.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shinya Kuribayashi 2012-05-17 20:11:06 +09:00 committed by Greg Kroah-Hartman
parent ec1ac6e169
commit 7cbb062ade
2 changed files with 35 additions and 0 deletions
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33
drivers/usb/otg/gpio_vbus.c
View file

@ -327,6 +327,8 @@ static int __init gpio_vbus_probe(struct platform_device *pdev)
goto err_otg;
}
device_init_wakeup(&pdev->dev, pdata->wakeup);
return 0;
err_otg:
regulator_put(gpio_vbus->vbus_draw);
@ -348,6 +350,7 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
int gpio = pdata->gpio_vbus;
device_init_wakeup(&pdev->dev, 0);
cancel_delayed_work_sync(&gpio_vbus->work);
regulator_put(gpio_vbus->vbus_draw);
@ -364,6 +367,33 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int gpio_vbus_pm_suspend(struct device *dev)
{
struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(gpio_vbus->irq);
return 0;
}
static int gpio_vbus_pm_resume(struct device *dev)
{
struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(gpio_vbus->irq);
return 0;
}
static const struct dev_pm_ops gpio_vbus_dev_pm_ops = {
.suspend = gpio_vbus_pm_suspend,
.resume = gpio_vbus_pm_resume,
};
#endif
/* NOTE: the gpio-vbus device may *NOT* be hotplugged */
MODULE_ALIAS("platform:gpio-vbus");
@ -372,6 +402,9 @@ static struct platform_driver gpio_vbus_driver = {
.driver = {
.name = "gpio-vbus",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &gpio_vbus_dev_pm_ops,
#endif
},
.remove = __exit_p(gpio_vbus_remove),
};

2
include/linux/usb/gpio_vbus.h
View file

@ -17,6 +17,7 @@
* @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid)
* @gpio_vbus_inverted: true if gpio_vbus is active low
* @gpio_pullup_inverted: true if gpio_pullup is active low
* @wakeup: configure gpio_vbus as a wake-up source
*
* The VBUS sensing GPIO should have a pulldown, which will normally be
* part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a
@ -27,4 +28,5 @@ struct gpio_vbus_mach_info {
int gpio_pullup;
bool gpio_vbus_inverted;
bool gpio_pullup_inverted;
bool wakeup;
};