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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-02-20 15:03:32 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-23 15:03:47 -0800 |
| commit | 19c262391c4741b012a5031fc438fb694e77c385 (patch) | |
| tree | 1ce81bf30086104f8102b83617d31d998338fbd6 /drivers/usb/core/driver.c | |
| parent | dfa87c824a9a5430008acd1ed2e8111ed164fcbe (diff) | |
| download | talos-obmc-linux-19c262391c4741b012a5031fc438fb694e77c385.tar.gz talos-obmc-linux-19c262391c4741b012a5031fc438fb694e77c385.zip | |
USB: export autosuspend delay in sysfs
This patch (as861) adds sysfs attributes to expose the autosuspend
delay value for each USB device. If the user changes the delay from 0
(no autosuspend) to a positive value, an autosuspend is attempted.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/driver.c')
| -rw-r--r-- | drivers/usb/core/driver.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index a420d72a0254..9e3e943f313c 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1225,6 +1225,26 @@ void usb_autosuspend_device(struct usb_device *udev) } /** + * usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces + * @udev: the usb_device to autosuspend + * + * This routine should be called when a core subsystem thinks @udev may + * be ready to autosuspend. + * + * @udev's usage counter left unchanged. If it or any of the usage counters + * for an active interface is greater than 0, or autosuspend is not allowed + * for any other reason, no autosuspend request will be queued. + * + * This routine can run only in process context. + */ +void usb_try_autosuspend_device(struct usb_device *udev) +{ + usb_autopm_do_device(udev, 0); + // dev_dbg(&udev->dev, "%s: cnt %d\n", + // __FUNCTION__, udev->pm_usage_cnt); +} + +/** * usb_autoresume_device - immediately autoresume a USB device and its interfaces * @udev: the usb_device to autoresume * |
