diff options
| author | Sakethram Bommisetti <sakethram.bommisetti@stericsson.com> | 2012-02-29 10:58:49 +0530 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 11:03:19 +0200 |
| commit | 13c8bfd54cb90efe68d9c8f3b9e47e7bf950b8f4 (patch) | |
| tree | 9c95d140943fe43732e9e288894cf100a6f25369 /drivers/usb/core | |
| parent | 1d46676256fe722fc11c266728f1f09de0943aa8 (diff) | |
USB:Enabling autosuspend in Host audio
Allowing to suspend the usb bus if the connected device is
a USB Audio device.
ST-Ericsson ID: 415876
Signed-off-by: Sakethram Bommisetti <sakethram.bommisetti@stericsson.com>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/driver.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 7ce5080df46..c90174ee4c1 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1671,7 +1671,7 @@ EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); /* Internal routine to check whether we may autosuspend a device. */ static int autosuspend_check(struct usb_device *udev) { - int w, i; + int w, i, audio_class = 0; struct usb_interface *intf; /* Fail if autosuspend is disabled, or any interfaces are in use, or @@ -1705,13 +1705,28 @@ static int autosuspend_check(struct usb_device *udev) intf->needs_remote_wakeup) return -EOPNOTSUPP; } + + if (intf->cur_altsetting->desc.bInterfaceClass + == USB_CLASS_AUDIO) { + dev_dbg(&udev->dev, + "audio interface class present\n"); + audio_class = 1; + } } + if (audio_class) { + dev_dbg(&udev->dev, + "disabling remote wakeup for audio class\n"); + udev->do_remote_wakeup = 0; + } else { + if (w && !device_can_wakeup(&udev->dev)) { + dev_dbg(&udev->dev, + "remote wakeup needed for autosuspend\n"); + return -EOPNOTSUPP; + } + udev->do_remote_wakeup = w; + } + } - if (w && !device_can_wakeup(&udev->dev)) { - dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); - return -EOPNOTSUPP; - } - udev->do_remote_wakeup = w; return 0; } |