staging: comedi: addi_apci_3xxx: refactor the ttl digital i/o support
Currently, the subdevice functions used to configure and read/write the
ttl digital i/o ports is way over to complicated. The (*insn_config)
function also abuses the comedi API by overriding the instruction
command passed in data[0].
Fix the ttl digital i/o support to work like the comedi core expects.
The (*insn_config) function supports the three instructions common for
COMEDI_SUBD_DIO subdevices:
INSN_CONFIG_DIO_INPUT - configure the specified channel as input
INSN_CONFIG_DIO_OUTPUT - configure the specified channel as output
INSN_CONFIG_DIO_QUERY - returns the status of the specified channel
Port 0 (channels 0-7) is always input
Port 1 (channels 8-15) is always output
Port 2 (channels 9-23) are programmable i/o (all channels are input or output)
The (*insn_bits) function allows writing to the output channels and returns
the state of all channels.
The (*insn_read) and (*insn_write) functions are not required. The comedi
core will emulate them using the (*insn_bits) function.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2 files changed