From b5e795f8df42936590ba9c606edc715fe3593284 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Tue, 20 Feb 2007 15:00:53 -0500 Subject: [PATCH] USB: make autosuspend delay a module parameter This patch (as859) makes the default USB autosuspend delay a module parameter of usbcore. By setting the delay value at boot time, users will be able to prevent the system from autosuspending devices which for some reason can't handle it. The patch also stores the autosuspend delay as a per-device value. A later patch will allow the user to change the value, tailoring the delay for each individual device. A delay value of 0 will prevent autosuspend. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- Documentation/kernel-parameters.txt | 7 +++++++ drivers/usb/core/driver.c | 16 ++++++++++------ drivers/usb/core/quirks.c | 6 ++++-- drivers/usb/core/usb.c | 12 ++++++++++++ drivers/usb/core/usb.h | 2 -- include/linux/usb.h | 3 +++ 6 files changed, 36 insertions(+), 10 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index c479d30eea..03eb5ed503 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1758,6 +1758,13 @@ and is between 256 and 4096 characters. It is defined in the file Note that genuine overcurrent events won't be reported either. + usbcore.autosuspend= + [USB] The autosuspend time delay (in seconds) used + for newly-detected USB devices (default 2). This + is the time required before an idle device will be + autosuspended. Devices for which the delay is set + to 0 won't be autosuspended at all. + usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index f9196a0a94..a420d72a02 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -963,12 +963,16 @@ static int autosuspend_check(struct usb_device *udev) int i; struct usb_interface *intf; - /* For autosuspend, fail fast if anything is in use. - * Also fail if any interfaces require remote wakeup but it - * isn't available. */ + /* For autosuspend, fail fast if anything is in use or autosuspend + * is disabled. Also fail if any interfaces require remote wakeup + * but it isn't available. + */ udev->do_remote_wakeup = device_may_wakeup(&udev->dev); if (udev->pm_usage_cnt > 0) return -EBUSY; + if (!udev->autosuspend_delay) + return -EPERM; + if (udev->actconfig) { for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { intf = udev->actconfig->interface[i]; @@ -991,7 +995,7 @@ static int autosuspend_check(struct usb_device *udev) #define autosuspend_check(udev) 0 -#endif +#endif /* CONFIG_USB_SUSPEND */ /** * usb_suspend_both - suspend a USB device and its interfaces @@ -1186,7 +1190,7 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt) udev->pm_usage_cnt -= inc_usage_cnt; } else if (inc_usage_cnt <= 0 && autosuspend_check(udev) == 0) queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, - USB_AUTOSUSPEND_DELAY); + udev->autosuspend_delay); usb_pm_unlock(udev); return status; } @@ -1270,7 +1274,7 @@ static int usb_autopm_do_interface(struct usb_interface *intf, intf->pm_usage_cnt -= inc_usage_cnt; } else if (inc_usage_cnt <= 0 && autosuspend_check(udev) == 0) queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, - USB_AUTOSUSPEND_DELAY); + udev->autosuspend_delay); } usb_pm_unlock(udev); return status; diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index ea0e48e9f6..0e5c646cb4 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -39,8 +39,10 @@ static const struct usb_device_id usb_quirk_list[] = { static void usb_autosuspend_quirk(struct usb_device *udev) { - /* unbalanced resume to prevent autosuspends */ - usb_autoresume_device(udev); +#ifdef CONFIG_USB_SUSPEND + /* disable autosuspend, but allow the user to re-enable it via sysfs */ + udev->autosuspend_delay = 0; +#endif } static const struct usb_device_id *find_id(struct usb_device *udev) diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 3db721cd55..54b42ce311 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -22,6 +22,7 @@ */ #include +#include #include #include #include @@ -50,6 +51,16 @@ static int nousb; /* Disable USB when built into kernel image */ struct workqueue_struct *ksuspend_usb_wq; /* For autosuspend */ +#ifdef CONFIG_USB_SUSPEND +static int usb_autosuspend_delay = 2; /* Default delay value, + * in seconds */ +module_param_named(autosuspend, usb_autosuspend_delay, uint, 0644); +MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); + +#else +#define usb_autosuspend_delay 0 +#endif + /** * usb_ifnum_to_if - get the interface object with a given interface number @@ -306,6 +317,7 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) #ifdef CONFIG_PM mutex_init(&dev->pm_mutex); INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); + dev->autosuspend_delay = usb_autosuspend_delay * HZ; #endif return dev; } diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 045cbd1118..b0a35f45b0 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -65,8 +65,6 @@ static inline void usb_pm_unlock(struct usb_device *udev) {} #ifdef CONFIG_USB_SUSPEND -#define USB_AUTOSUSPEND_DELAY (HZ*2) - extern void usb_autosuspend_device(struct usb_device *udev); extern int usb_autoresume_device(struct usb_device *udev); diff --git a/include/linux/usb.h b/include/linux/usb.h index 37e522eba4..87dc75a6ce 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -389,10 +389,13 @@ struct usb_device { int pm_usage_cnt; /* usage counter for autosuspend */ u32 quirks; /* quirks of the whole device */ + #ifdef CONFIG_PM struct delayed_work autosuspend; /* for delayed autosuspends */ struct mutex pm_mutex; /* protects PM operations */ + unsigned autosuspend_delay; /* in jiffies */ + unsigned auto_pm:1; /* autosuspend/resume in progress */ unsigned do_remote_wakeup:1; /* remote wakeup should be enabled */ #endif -- 2.39.5