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| author | Alan Stern <stern@rowland.harvard.edu> | 2010-01-08 12:56:54 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-02 14:54:10 -0800 |
| commit | 088f7fec8a0e683db72fd8826c5d3ab914e197b1 (patch) | |
| tree | 971ef100d0db9727e4403865b67c72de62e8247a /drivers/usb/core/hub.c | |
| parent | 0c4db6df915bc470f0cd32fe48287fa6eb6adfb4 (diff) | |
| download | linux-088f7fec8a0e683db72fd8826c5d3ab914e197b1.tar.gz linux-088f7fec8a0e683db72fd8826c5d3ab914e197b1.tar.bz2 linux-088f7fec8a0e683db72fd8826c5d3ab914e197b1.zip | |
USB: implement usb_enable_autosuspend
This patch (as1326) adds usb_enable_autosuspend() and
usb_disable_autosuspend() routines for use by drivers. If a driver
knows that its device can handle suspends and resumes correctly, it
can enable autosuspend all by itself. This is equivalent to the user
writing "auto" to the device's power/level attribute.
The implementation differs slightly from what it used to be. Now
autosuspend is disabled simply by doing usb_autoresume_device() (to
increment the usage counter) and enabled by doing
usb_autosuspend_device() (to decrement the usage counter).
The set_level() attribute method is updated to use the new routines,
and the USB Power-Management documentation is updated.
The patch adds a usb_enable_autosuspend() call to the hub driver's
probe routine, allowing the special-case code for hubs in quirks.c to
be removed.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hub.c')
| -rw-r--r-- | drivers/usb/core/hub.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index bfa6123bbdb5..746f26f222ab 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1224,6 +1224,9 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) desc = intf->cur_altsetting; hdev = interface_to_usbdev(intf); + /* Hubs have proper suspend/resume support */ + usb_enable_autosuspend(hdev); + if (hdev->level == MAX_TOPO_LEVEL) { dev_err(&intf->dev, "Unsupported bus topology: hub nested too deep\n"); |