Le 12/02/2015 18:54, Sylvain Rochet a écrit :
> This patch add suspend/resume with wakeup support for Atmel USBA.
>
> On suspend: We stay continuously clocked if Vbus signal is not
> available. If Vbus signal is available we set the Vbus signal as a wake
> up source then we stop the USBA itself and all clocks used by USBA.
>
> On resume: We recover clocks and USBA if we stopped them. If a device is
> currently connected at resume time we enable the controller.
>
> Signed-off-by: Sylvain Rochet <sylvain.rochet@xxxxxxxxxxxx>
> Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
> drivers/usb/gadget/udc/atmel_usba_udc.c | 57 +++++++++++++++++++++++++++++++++
> 1 file changed, 57 insertions(+)
>
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
> index 999e2f2..d019b6c 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
> @@ -2177,6 +2177,7 @@ static int usba_udc_probe(struct platform_device *pdev)
> ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
> if (ret)
> return ret;
> + device_init_wakeup(&pdev->dev, 1);
>
> usba_init_debugfs(udc);
> for (i = 1; i < udc->num_ep; i++)
> @@ -2192,6 +2193,7 @@ static int __exit usba_udc_remove(struct platform_device *pdev)
>
> udc = platform_get_drvdata(pdev);
>
> + device_init_wakeup(&pdev->dev, 0);
> usb_del_gadget_udc(&udc->gadget);
>
> for (i = 1; i < udc->num_ep; i++)
> @@ -2201,10 +2203,65 @@ static int __exit usba_udc_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM
> +static int usba_udc_suspend(struct device *dev)
> +{
> + struct usba_udc *udc = dev_get_drvdata(dev);
> +
> + /* Not started */
> + if (!udc->driver)
> + return 0;
> +
> + mutex_lock(&udc->vbus_mutex);
> +
> + if (!device_may_wakeup(dev)) {
> + usba_stop(udc);
> + goto out;
> + }
> +
> + /*
> + * Device may wake up. We stay clocked if we failed
> + * to request vbus irq, assuming always on.
> + */
> + if (gpio_is_valid(udc->vbus_pin)) {
> + usba_stop(udc);
> + enable_irq_wake(gpio_to_irq(udc->vbus_pin));
> + }
> +
> +out:
> + mutex_unlock(&udc->vbus_mutex);
> + return 0;
> +}
> +
> +static int usba_udc_resume(struct device *dev)
> +{
> + struct usba_udc *udc = dev_get_drvdata(dev);
> +
> + /* Not started */
> + if (!udc->driver)
> + return 0;
> +
> + if (device_may_wakeup(dev) && gpio_is_valid(udc->vbus_pin))
> + disable_irq_wake(gpio_to_irq(udc->vbus_pin));
> +
> + /* If Vbus is present, enable the controller and wait for reset */
> + mutex_lock(&udc->vbus_mutex);
> + udc->vbus_prev = vbus_is_present(udc);
> + if (udc->vbus_prev)
> + usba_start(udc);
> + mutex_unlock(&udc->vbus_mutex);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
> +
> static struct platform_driver udc_driver = {
> .remove = __exit_p(usba_udc_remove),
> .driver = {
> .name = "atmel_usba_udc",
> + .pm = &usba_udc_pm_ops,
> .of_match_table = of_match_ptr(atmel_udc_dt_ids),
> },
> };
>
--
Nicolas Ferre
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