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28 .Dd September 23, 2003
34 .Nd "configure interrupt polarity and trigger mode"
41 .Fa "device_t dev" "int irq" "enum intr_trigger trig" "enum intr_polarity pol"
47 method allows bus or device drivers to provide interrupt polarity and trigger
48 mode to parent busses.
49 This typically bubbles all the way up to the root bus (e.g.\& nexus) where the
50 necessary actions are taken to actually program the hardware.
53 method takes an interrupt number, it is assumed but not necessarily required
54 that it is called prior to
55 .Xr BUS_SETUP_INTR 9 .
59 argument can be one of:
60 .Bl -tag -width ".Dv INTR_TRIGGER_CONFORM"
61 .It Dv INTR_TRIGGER_CONFORM
62 The interrupt trigger mode is standard for the bus to which the device is
64 .It Dv INTR_TRIGGER_EDGE
65 The interrupt is edge triggered.
66 This means that the interrupt is raised by the rising edge of the signal on
68 The signal typically reverts to the original state so as to cause a spike.
69 .Dv INTR_TRIGGER_LEVEL
70 The interrupt is level triggered.
71 This means that the interrupt is raised when the signal on the interrupt line
72 transitions and remains unchanged after that until the interrupt has been
73 serviced, after which the signal transitions back.
78 argument can be any one of:
79 .Bl -tag -width ".Dv INTR_POLARITY_CONFORM"
80 .It Dv INTR_POLARITY_CONFORM
81 The interrupt polarity is standard for the bus to which the device is attached.
82 .It Dv INTR_POLARITY_HIGH
83 The interrupt is activated by a high voltage on the interrupt line.
84 .It Dv INTR_POLARITY_LOW
85 The interrupt is activated by a low voltage on the interrupt line.
89 Zero is returned on success, otherwise an appropriate error is returned.
92 .Xr BUS_SETUP_INTR 9 ,
93 .Xr BUS_TEARDOWN_INTR 9 ,
100 method first appeared in
104 This manual page was written by
106 .Aq marcel@xcllnt.net .