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staging: comedi: das08: rename DAS08_OP() and DAS08_DO_MASK

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The `DAS08_DO_MASK` macro is a bitmask for the control register
corresponding to the digital output channels (except on "JR" boards).
Rename it to `DAS08_CONTROL_DO_MASK` and add a comment.

The `DAS08_OP(x)` macro takes a bitvector of the desired digital output
channel states and returns the corresponding bits for the control
register (except on "JR" boards).  Rename it to `DAS08_CONTROL_DO(x)`
and add a comment.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2015-06-05 18:30:19 +01:00 committed by Greg Kroah-Hartman
parent 6a3a22bcad
commit 11e8457f02
1 changed files with 5 additions and 4 deletions
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9
drivers/staging/comedi/drivers/das08.c
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@ -75,8 +75,9 @@
#define DAS08_CONTROL_MUX_MASK 0x7 /* multiplexor channel mask */
#define DAS08_CONTROL_MUX(x) ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
#define DAS08_CONTROL_INTE BIT(3) /* interrupt enable (not "JR" boards) */
#define DAS08_DO_MASK 0xf0
#define DAS08_OP(x) (((x) << 4) & DAS08_DO_MASK)
#define DAS08_CONTROL_DO_MASK 0xf0 /* digital outputs mask (not "JR") */
/* digital outputs (not "JR" boards) */
#define DAS08_CONTROL_DO(x) (((x) << 4) & DAS08_CONTROL_DO_MASK)
/*
cio-das08jr.pdf
@ -307,8 +308,8 @@ static int das08_do_wbits(struct comedi_device *dev,
if (comedi_dio_update_state(s, data)) {
/* prevent race with setting of analog input mux */
spin_lock(&dev->spinlock);
devpriv->do_mux_bits &= ~DAS08_DO_MASK;
devpriv->do_mux_bits |= DAS08_OP(s->state);
devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
spin_unlock(&dev->spinlock);
}