There also are a couple of utility routines drivers can use:
- usb_autopm_enable() sets pm_usage_cnt to 1 and then calls
- usb_autopm_set_interface(), which will attempt an autoresume.
-
- usb_autopm_disable() sets pm_usage_cnt to 0 and then calls
+ usb_autopm_enable() sets pm_usage_cnt to 0 and then calls
usb_autopm_set_interface(), which will attempt an autosuspend.
+ usb_autopm_disable() sets pm_usage_cnt to 1 and then calls
+ usb_autopm_set_interface(), which will attempt an autoresume.
+
The conventional usage pattern is that a driver calls
usb_autopm_get_interface() in its open routine and
usb_autopm_put_interface() in its close or release routine. But