Am Freitag, 9. Februar 2007 23:12 schrieb Alan Stern:
Firstly, cool.
I'll look at it closer again, but just some first comments.
> +static ssize_t
> +set_autosuspend(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct usb_device *udev;
> + unsigned value, old;
> +
> + if (sscanf(buf, "%u", &value) != 1 || value >= INT_MAX/HZ)
> + return -EINVAL;
> + value *= HZ;
> +
> + if (is_usb_device(dev)) {
> + udev = to_usb_device(dev);
> + old = udev->autosuspend_delay;
> + udev->autosuspend_delay = value;
> + } else {
> + struct usb_interface *intf = to_usb_interface(dev);
> +
> + udev = interface_to_usbdev(intf);
> + old = intf->autosuspend_delay;
> + intf->autosuspend_delay = value;
> + }
> + if (value > 0 && old == 0)
> + usb_try_autosuspend_device(udev);
You should retain symmetry. Writing 0 should wake up the device.
Secondly, how about exposing USB_IF_DEVICE_BUSY through sysfs?
Regards
Oliver
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