path: root/Documentation
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authorAlan Stern <stern@rowland.harvard.edu>2007-03-13 16:39:15 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-27 13:28:35 -0700
commiteaafbc3a8adab16babe2c20e54ad3ba40d1fbbc9 (patch)
treefea84341faf742efe8beeaff03ec94b687b7b26f /Documentation
parent6b157c9bf3bace6eeb4a973da63923ef24995cce (diff)
USB: Allow autosuspend delay to equal 0
This patch (as867) adds an entry for the new power/autosuspend attribute in Documentation/ABI/testing, and it changes the behavior of the delay value. Now a delay of 0 means to autosuspend as soon as possible, and negative values will prevent autosuspend. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
2 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
new file mode 100644
index 000000000000..00a84326325f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -0,0 +1,15 @@
+What: /sys/bus/usb/devices/.../power/autosuspend
+Date: March 2007
+KernelVersion: 2.6.21
+Contact: Alan Stern <stern@rowland.harvard.edu>
+ Each USB device directory will contain a file named
+ power/autosuspend. This file holds the time (in seconds)
+ the device must be idle before it will be autosuspended.
+ 0 means the device will be autosuspended as soon as
+ possible. Negative values will prevent the device from
+ being autosuspended at all, and writing a negative value
+ will resume the device if it is already suspended.
+ The autosuspend delay for newly-created devices is set to
+ the value of the usbcore.autosuspend module parameter.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 12533a958c51..2017942e0966 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1792,7 +1792,7 @@ and is between 256 and 4096 characters. It is defined in the file
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.
+ to a negative value won't be autosuspended at all.
[USBHID] The interval which mice are to be polled at.