From: H Hartley Sweeten Date: Thu, 25 Jul 2013 23:05:53 +0000 (-0700) Subject: staging: comedi: usbdux: tidy up usbdux_dio_insn_config() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fc110df61f0adf060d6b2011ecaba45332a479a6;p=linux-beck.git staging: comedi: usbdux: tidy up usbdux_dio_insn_config() Tidy up this function a bit. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c index 40e1424ce5a0..cdb02876a719 100644 --- a/drivers/staging/comedi/drivers/usbdux.c +++ b/drivers/staging/comedi/drivers/usbdux.c @@ -1273,32 +1273,30 @@ ao_cmd_exit: static int usbdux_dio_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { - int chan = CR_CHAN(insn->chanspec); - - /* The input or output configuration of each digital line is - * configured by a special insn_config instruction. chanspec - * contains the channel to be changed, and data[0] contains the - * value COMEDI_INPUT or COMEDI_OUTPUT. */ + unsigned int mask = 1 << CR_CHAN(insn->chanspec); switch (data[0]) { case INSN_CONFIG_DIO_OUTPUT: - s->io_bits |= 1 << chan; /* 1 means Out */ + s->io_bits |= mask; break; case INSN_CONFIG_DIO_INPUT: - s->io_bits &= ~(1 << chan); + s->io_bits &= ~mask; break; case INSN_CONFIG_DIO_QUERY: - data[1] = - (s->io_bits & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT; + data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; break; default: return -EINVAL; break; } - /* we don't tell the firmware here as it would take 8 frames */ - /* to submit the information. We do it in the insn_bits. */ + + /* + * We don't tell the firmware here as it would take 8 frames + * to submit the information. We do it in the insn_bits. + */ return insn->n; }