Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753270AbbDCM6y (ORCPT ); Fri, 3 Apr 2015 08:58:54 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:38235 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753229AbbDCM6t (ORCPT ); Fri, 3 Apr 2015 08:58:49 -0400 From: Tomeu Vizoso To: linux-pm@vger.kernel.org Cc: Tomeu Vizoso , Greg Kroah-Hartman , Scot Doyle , Alan Stern , Dan Williams , Julius Werner , "Rafael J. Wysocki" , Viresh Kumar , Sebastian Andrzej Siewior , Pratyush Anand , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 7/7] USB / PM: Allow USB devices to remain runtime-suspended when sleeping Date: Fri, 3 Apr 2015 14:57:56 +0200 Message-Id: <1428065887-16017-8-git-send-email-tomeu.vizoso@collabora.com> X-Mailer: git-send-email 2.3.4 In-Reply-To: <1428065887-16017-1-git-send-email-tomeu.vizoso@collabora.com> References: <1428065887-16017-1-git-send-email-tomeu.vizoso@collabora.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3820 Lines: 138 Have dev_pm_ops.prepare return 1 for USB devices, interfaces, endpoints and ports so that USB devices can remain runtime-suspended when the system goes to a sleep state, if their wakeup state is correct. Also enable runtime PM for endpoints, which is another requirement for the above to work. Signed-off-by: Tomeu Vizoso --- drivers/usb/core/endpoint.c | 17 +++++++++++++++++ drivers/usb/core/message.c | 16 ++++++++++++++++ drivers/usb/core/port.c | 6 ++++++ drivers/usb/core/usb.c | 8 +++++++- 4 files changed, 46 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c index 39a2402..7c82bb7 100644 --- a/drivers/usb/core/endpoint.c +++ b/drivers/usb/core/endpoint.c @@ -160,6 +160,19 @@ static const struct attribute_group *ep_dev_groups[] = { NULL }; +#ifdef CONFIG_PM + +static int usb_ep_device_prepare(struct device *dev) +{ + return 1; +} + +static const struct dev_pm_ops usb_ep_device_pm_ops = { + .prepare = usb_ep_device_prepare, +}; + +#endif /* CONFIG_PM */ + static void ep_device_release(struct device *dev) { struct ep_device *ep_dev = to_ep_device(dev); @@ -170,6 +183,9 @@ static void ep_device_release(struct device *dev) struct device_type usb_ep_device_type = { .name = "usb_endpoint", .release = ep_device_release, +#ifdef CONFIG_PM + .pm = &usb_ep_device_pm_ops, +#endif }; int usb_create_ep_devs(struct device *parent, @@ -197,6 +213,7 @@ int usb_create_ep_devs(struct device *parent, goto error_register; device_enable_async_suspend(&ep_dev->dev); + pm_runtime_enable(&ep_dev->dev); endpoint->ep_dev = ep_dev; return retval; diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index f368d20..9041aee 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1589,10 +1589,26 @@ static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) return 0; } +#ifdef CONFIG_PM + +static int usb_if_prepare(struct device *dev) +{ + return 1; +} + +static const struct dev_pm_ops usb_if_pm_ops = { + .prepare = usb_if_prepare, +}; + +#endif /* CONFIG_PM */ + struct device_type usb_if_device_type = { .name = "usb_interface", .release = usb_release_interface, .uevent = usb_if_uevent, +#ifdef CONFIG_PM + .pm = &usb_if_pm_ops, +#endif }; static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index 2106183..f49707d 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -168,12 +168,18 @@ static int usb_port_runtime_suspend(struct device *dev) return retval; } + +static int usb_port_prepare(struct device *dev) +{ + return 1; +} #endif static const struct dev_pm_ops usb_port_pm_ops = { #ifdef CONFIG_PM .runtime_suspend = usb_port_runtime_suspend, .runtime_resume = usb_port_runtime_resume, + .prepare = usb_port_prepare, #endif }; diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 8d5b2f4..3a55c91 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -316,7 +316,13 @@ static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) static int usb_dev_prepare(struct device *dev) { - return 0; /* Implement eventually? */ + struct usb_device *udev = to_usb_device(dev); + + /* Return 0 if the current wakeup setting is wrong, otherwise 1 */ + if (udev->do_remote_wakeup != device_may_wakeup(dev)) + return 0; + + return 1; } static void usb_dev_complete(struct device *dev) -- 2.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/