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staging: comedi: rtd520: use normal bitfield functions 

The `unsigned char chan_is_bipolar[]` member of `struct rtd_private` is
used with some macros as a packed array of 1-bit values that indicate
whether the corresponding entries in the hardware's "channel-gain" table
have been set to a bipolar (1) or unipolar (0) range, as the raw samples
from the hardware need to be cooked differently in each case.

Replace the declaration of the member with a standard Linux bitfield
using `DECLARE_BITFIELD()`, and replace the home-grown macros used
access the bitfield with the standard Linux non-atomic bitop functions,
`__set_bit()`, `__clear_bit()` and `test_bit()`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-10-17 12:06:34 +01:00 committed by Greg Kroah-Hartman
parent 0735e83c78
commit f8d939e411
1 changed files with 7 additions and 20 deletions
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27
drivers/staging/comedi/drivers/rtd520.c
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@ -394,11 +394,8 @@ struct rtd_private {
long ai_count; /* total transfer size (samples) */
int xfer_count; /* # to transfer data. 0->1/2FIFO */
int flags; /* flag event modes */
unsigned char chan_is_bipolar[RTD_MAX_CHANLIST / 8]; /* bit array */
DECLARE_BITMAP(chan_is_bipolar, RTD_MAX_CHANLIST);
unsigned int ao_readback[2];
unsigned fifosz;
};
@ -407,14 +404,6 @@ struct rtd_private {
#define DMA0_ACTIVE 0x02 /* DMA0 is active */
#define DMA1_ACTIVE 0x04 /* DMA1 is active */
/* Macros for accessing channel list bit array */
#define CHAN_ARRAY_TEST(array, index) \
(((array)[(index)/8] >> ((index) & 0x7)) & 0x1)
#define CHAN_ARRAY_SET(array, index) \
(((array)[(index)/8] |= 1 << ((index) & 0x7)))
#define CHAN_ARRAY_CLEAR(array, index) \
(((array)[(index)/8] &= ~(1 << ((index) & 0x7))))
/*
Given a desired period and the clock period (both in ns),
return the proper counter value (divider-1).
@ -478,17 +467,17 @@ static unsigned short rtd_convert_chan_gain(struct comedi_device *dev,
/* +-5 range */
r |= 0x000;
r |= (range & 0x7) << 4;
CHAN_ARRAY_SET(devpriv->chan_is_bipolar, index);
__set_bit(index, devpriv->chan_is_bipolar);
} else if (range < board->range_uni10) {
/* +-10 range */
r |= 0x100;
r |= ((range - board->range_bip10) & 0x7) << 4;
CHAN_ARRAY_SET(devpriv->chan_is_bipolar, index);
__set_bit(index, devpriv->chan_is_bipolar);
} else {
/* +10 range */
r |= 0x200;
r |= ((range - board->range_uni10) & 0x7) << 4;
CHAN_ARRAY_CLEAR(devpriv->chan_is_bipolar, index);
__clear_bit(index, devpriv->chan_is_bipolar);
}
switch (aref) {
@ -619,7 +608,7 @@ static int rtd_ai_rinsn(struct comedi_device *dev,
d = readw(devpriv->las1 + LAS1_ADC_FIFO);
/*printk ("rtd520: Got 0x%x after %d usec\n", d, ii+1); */
d = d >> 3; /* low 3 bits are marker lines */
if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar, 0))
if (test_bit(0, devpriv->chan_is_bipolar))
/* convert to comedi unsigned data */
d = comedi_offset_munge(s, d);
data[n] = d & s->maxdata;
@ -651,8 +640,7 @@ static int ai_read_n(struct comedi_device *dev, struct comedi_subdevice *s,
d = readw(devpriv->las1 + LAS1_ADC_FIFO);
d = d >> 3; /* low 3 bits are marker lines */
if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar,
s->async->cur_chan))
if (test_bit(s->async->cur_chan, devpriv->chan_is_bipolar))
/* convert to comedi unsigned data */
d = comedi_offset_munge(s, d);
d &= s->maxdata;
@ -681,8 +669,7 @@ static int ai_read_dregs(struct comedi_device *dev, struct comedi_subdevice *s)
}
d = d >> 3; /* low 3 bits are marker lines */
if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar,
s->async->cur_chan))
if (test_bit(s->async->cur_chan, devpriv->chan_is_bipolar))
/* convert to comedi unsigned data */
d = comedi_offset_munge(s, d);
d &= s->maxdata;