DEVICE_GET_FLAGS(9) BSD Kernel Developer's Manual DEVICE_GET_FLAGS(9)NAME
device_set_flags, device_get_flags -- manipulate driver flags
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
void
device_set_flags(device_t dev, uint32_t flags);
uint32_t
device_get_flags(device_t dev);
DESCRIPTION
Each device supports a set of driver-dependent flags which are often used to control device behaviour. These flags are read by calling
device_get_flags() and written by calling device_set_flags().
SEE ALSO device(9)AUTHORS
This manual page was written by Doug Rabson.
BSD September 6, 1999 BSD
Check Out this Related Man Page
DEVICE_GET_STATE(9) BSD Kernel Developer's Manual DEVICE_GET_STATE(9)NAME
device_get_state, device_busy, device_unbusy, device_is_alive, device_is_attached -- manipulate device state
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
device_state_t
device_get_state(device_t dev);
void
device_busy(device_t dev);
void
device_unbusy(device_t dev);
int
device_is_alive(device_t dev);
int
device_is_attached(device_t dev);
DESCRIPTION
The current state of a device is accessed by calling device_get_state() which returns DS_NOTPRESENT, DS_ALIVE, DS_ATTACHED or DS_BUSY
(described in device(9)). To test see if a device was successfully probed, call device_is_alive() which simply returns if the state is
greater or equal to DS_ALIVE. To test see if a device was successfully attached, call device_is_attached() which simply returns if the state
is greater or equal to DS_ATTACHED.
Each device has a busy count which is incremented when device_busy() is called and decremented when device_unbusy() is called. Both routines
return an error if the device state is less than DS_ATTACHED.
When device_busy() is called on a device in the DS_ATTACHED state, the device changes to the DS_BUSY state. When device_unbusy() is called
and after decrementing, the busy count for the device is zero, the device changes to the DS_ATTACHED state.
SEE ALSO device(9)AUTHORS
This manual page was written by Doug Rabson.
BSD June 16, 1998 BSD
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