forked from luck/tmp_suning_uos_patched
usb: gadget: atmel_usba_udc: Add suspend/resume with wakeup support
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@finsecur.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
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a64ef71ddc
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@ -2177,6 +2177,7 @@ static int usba_udc_probe(struct platform_device *pdev)
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ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
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if (ret)
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return ret;
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device_init_wakeup(&pdev->dev, 1);
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usba_init_debugfs(udc);
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for (i = 1; i < udc->num_ep; i++)
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@ -2192,6 +2193,7 @@ static int __exit usba_udc_remove(struct platform_device *pdev)
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udc = platform_get_drvdata(pdev);
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device_init_wakeup(&pdev->dev, 0);
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usb_del_gadget_udc(&udc->gadget);
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for (i = 1; i < udc->num_ep; i++)
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@ -2201,10 +2203,65 @@ static int __exit usba_udc_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_PM
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static int usba_udc_suspend(struct device *dev)
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{
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struct usba_udc *udc = dev_get_drvdata(dev);
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/* Not started */
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if (!udc->driver)
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return 0;
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mutex_lock(&udc->vbus_mutex);
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if (!device_may_wakeup(dev)) {
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usba_stop(udc);
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goto out;
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}
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/*
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* Device may wake up. We stay clocked if we failed
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* to request vbus irq, assuming always on.
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*/
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if (gpio_is_valid(udc->vbus_pin)) {
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usba_stop(udc);
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enable_irq_wake(gpio_to_irq(udc->vbus_pin));
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}
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out:
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mutex_unlock(&udc->vbus_mutex);
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return 0;
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}
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static int usba_udc_resume(struct device *dev)
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{
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struct usba_udc *udc = dev_get_drvdata(dev);
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/* Not started */
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if (!udc->driver)
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return 0;
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if (device_may_wakeup(dev) && gpio_is_valid(udc->vbus_pin))
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disable_irq_wake(gpio_to_irq(udc->vbus_pin));
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/* If Vbus is present, enable the controller and wait for reset */
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mutex_lock(&udc->vbus_mutex);
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udc->vbus_prev = vbus_is_present(udc);
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if (udc->vbus_prev)
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usba_start(udc);
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mutex_unlock(&udc->vbus_mutex);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
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static struct platform_driver udc_driver = {
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.remove = __exit_p(usba_udc_remove),
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.driver = {
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.name = "atmel_usba_udc",
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.pm = &usba_udc_pm_ops,
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.of_match_table = of_match_ptr(atmel_udc_dt_ids),
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},
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};
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