diff options
author | Ian Abbott <abbotti@mev.co.uk> | 2014-09-01 12:03:51 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-02 11:21:32 -0700 |
commit | 2cd5da05b0ea4bf178fab718d42de5a386600991 (patch) | |
tree | 173897480c33dc675c76306103459222951439d9 /drivers/staging | |
parent | 14c289d896d31903b04656701464de46ffb197c5 (diff) | |
download | linux-2cd5da05b0ea4bf178fab718d42de5a386600991.tar.bz2 |
staging: comedi: amplc_pci230: use comedi_range_is_bipolar()
Use the inline `comedi_range_is_bipolar()` function from "comedidev.h"
to decide whether a range is bipolar or unipolar instead of using the
local static arrays `pci230_ai_bipolar[]` and `pci230_ao_bipolar[]`
which can then be removed.
Change the types of the `ai_bipolar` and `ao_bipolar` members of `struct
pci230_private` to `bool` to match the return value of
`comedi_range_is_bipolar()` and change them into single-bit bitfields to
save a bit of space. Also change the type and name of some local
variables in `pci230_ai_check_chanlist()` that hold the result of
`comedi_range_is_bipolar()`.
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>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/comedi/drivers/amplc_pci230.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/drivers/staging/comedi/drivers/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c index 6cd235df5c96..895982099aaa 100644 --- a/drivers/staging/comedi/drivers/amplc_pci230.c +++ b/drivers/staging/comedi/drivers/amplc_pci230.c @@ -506,11 +506,11 @@ struct pci230_private { unsigned short adcfifothresh; /* ADC FIFO threshold (PCI230+/260+) */ unsigned short adcg; /* ADCG register value */ unsigned char int_en; /* Interrupt enable bits */ - unsigned char ai_bipolar; /* Flag AI range is bipolar */ - unsigned char ao_bipolar; /* Flag AO range is bipolar */ unsigned char ier; /* Copy of interrupt enable register */ unsigned char intr_running; /* Flag set in interrupt routine */ unsigned char res_owner[NUM_RESOURCES]; /* Shared resource owners */ + bool ai_bipolar:1; /* Flag AI range is bipolar */ + bool ao_bipolar:1; /* Flag AO range is bipolar */ }; /* PCI230 clock source periods in ns */ @@ -538,9 +538,6 @@ static const struct comedi_lrange pci230_ai_range = { /* PCI230 analogue gain bits for each input range. */ static const unsigned char pci230_ai_gain[7] = { 0, 1, 2, 3, 1, 2, 3 }; -/* PCI230 adccon bipolar flag for each analogue input range. */ -static const unsigned char pci230_ai_bipolar[7] = { 1, 1, 1, 1, 0, 0, 0 }; - /* PCI230 analogue output range table */ static const struct comedi_lrange pci230_ao_range = { 2, { @@ -549,9 +546,6 @@ static const struct comedi_lrange pci230_ao_range = { } }; -/* PCI230 daccon bipolar flag for each analogue output range. */ -static const unsigned char pci230_ao_bipolar[2] = { 0, 1 }; - static unsigned short pci230_ai_read(struct comedi_device *dev) { const struct pci230_board *thisboard = comedi_board(dev); @@ -809,7 +803,7 @@ static int pci230_ai_insn_read(struct comedi_device *dev, adccon = PCI230_ADC_TRIG_Z2CT2 | PCI230_ADC_FIFO_EN; /* Set Z2-CT2 output low to avoid any false triggers. */ i8254_set_mode(dev->iobase + PCI230_Z2_CT_BASE, 0, 2, I8254_MODE0); - devpriv->ai_bipolar = pci230_ai_bipolar[range]; + devpriv->ai_bipolar = comedi_range_is_bipolar(s, range); if (aref == AREF_DIFF) { /* Differential. */ gainshift = chan * 2; @@ -892,7 +886,7 @@ static int pci230_ao_insn_write(struct comedi_device *dev, * Set range - see analogue output range table; 0 => unipolar 10V, * 1 => bipolar +/-10V range scale */ - devpriv->ao_bipolar = pci230_ao_bipolar[range]; + devpriv->ao_bipolar = comedi_range_is_bipolar(s, range); outw(range, devpriv->daqio + PCI230_DACCON); for (i = 0; i < insn->n; i++) { @@ -1424,7 +1418,7 @@ static int pci230_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s) * 1 => bipolar +/-10V range scale */ range = CR_RANGE(cmd->chanlist[0]); - devpriv->ao_bipolar = pci230_ao_bipolar[range]; + devpriv->ao_bipolar = comedi_range_is_bipolar(s, range); daccon = devpriv->ao_bipolar ? PCI230_DAC_OR_BIP : PCI230_DAC_OR_UNI; /* Use DAC FIFO for hardware version 2 onwards. */ if (devpriv->hwver >= 2) { @@ -1514,7 +1508,7 @@ static int pci230_ai_check_chanlist(struct comedi_device *dev, unsigned int prev_chan = 0; unsigned int prev_range = 0; unsigned int prev_aref = 0; - unsigned int prev_polarity = 0; + bool prev_bipolar = false; unsigned int subseq_len = 0; int i; @@ -1523,7 +1517,7 @@ static int pci230_ai_check_chanlist(struct comedi_device *dev, unsigned int chan = CR_CHAN(chanspec); unsigned int range = CR_RANGE(chanspec); unsigned int aref = CR_AREF(chanspec); - unsigned int polarity = pci230_ai_bipolar[range]; + bool bipolar = comedi_range_is_bipolar(s, range); if (aref == AREF_DIFF && chan >= max_diff_chan) { dev_dbg(dev->class_dev, @@ -1555,7 +1549,7 @@ static int pci230_ai_check_chanlist(struct comedi_device *dev, return -EINVAL; } - if (polarity != prev_polarity) { + if (bipolar != prev_bipolar) { dev_dbg(dev->class_dev, "%s: channel sequence ranges must be all bipolar or all unipolar\n", __func__); @@ -1573,7 +1567,7 @@ static int pci230_ai_check_chanlist(struct comedi_device *dev, prev_chan = chan; prev_range = range; prev_aref = aref; - prev_polarity = polarity; + prev_bipolar = bipolar; } if (subseq_len == 0) @@ -2296,7 +2290,7 @@ static int pci230_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) } range = CR_RANGE(cmd->chanlist[0]); - devpriv->ai_bipolar = pci230_ai_bipolar[range]; + devpriv->ai_bipolar = comedi_range_is_bipolar(s, range); if (devpriv->ai_bipolar) adccon |= PCI230_ADC_IR_BIP; else |