diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2013-09-20 23:38:09 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-25 22:59:58 (GMT) |
| commit | 871b43cec94066cfbb457daa5f824de1f12330c0 (patch) | |
| tree | f066bfe8303ef43b3ca71b76b1ae93edb2be9a20 | |
| parent | 8509e6d8ec091c394cfeeae5dc1eaeaec640463c (diff) | |
| download | linux-fsl-qoriq-871b43cec94066cfbb457daa5f824de1f12330c0.tar.xz | |
staging: comedi: pcl711: tidy up pcl711_ao_insn()
For aesthetics, rename this function to help with greps.
Introduce a helper function to write the values to the analog
output channel registers. Modify the defines for the D/A registers
to avoid the ? : tests based on the chan number.
Only the final value written needs to be saved for read back.
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>
| -rw-r--r-- | drivers/staging/comedi/drivers/pcl711.c | 50 |
1 files changed, 24 insertions, 26 deletions
diff --git a/drivers/staging/comedi/drivers/pcl711.c b/drivers/staging/comedi/drivers/pcl711.c index 9b439cc..9e19fe9 100644 --- a/drivers/staging/comedi/drivers/pcl711.c +++ b/drivers/staging/comedi/drivers/pcl711.c @@ -70,13 +70,11 @@ supported. #define PCL711_CTR2 0x02 #define PCL711_CTRCTL 0x03 #define PCL711_AD_LO 0x04 -#define PCL711_DA0_LO 0x04 #define PCL711_AD_HI 0x05 -#define PCL711_DA0_HI 0x05 +#define PCL711_AO_LSB_REG(x) (0x04 + ((x) * 2)) +#define PCL711_AO_MSB_REG(x) (0x05 + ((x) * 2)) #define PCL711_DI_LO 0x06 -#define PCL711_DA1_LO 0x06 #define PCL711_DI_HI 0x07 -#define PCL711_DA1_HI 0x07 #define PCL711_CLRINTR 0x08 #define PCL711_GAIN 0x09 #define PCL711_MUX 0x0a @@ -405,26 +403,30 @@ static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) return 0; } -/* - analog output -*/ -static int pcl711_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) +static void pcl711_ao_write(struct comedi_device *dev, + unsigned int chan, unsigned int val) { - struct pcl711_private *devpriv = dev->private; - int n; - int chan = CR_CHAN(insn->chanspec); + outb(val & 0xff, dev->iobase + PCL711_AO_LSB_REG(chan)); + outb((val >> 8) & 0xff, dev->iobase + PCL711_AO_MSB_REG(chan)); +} - for (n = 0; n < insn->n; n++) { - outb((data[n] & 0xff), - dev->iobase + (chan ? PCL711_DA1_LO : PCL711_DA0_LO)); - outb((data[n] >> 8), - dev->iobase + (chan ? PCL711_DA1_HI : PCL711_DA0_HI)); +static int pcl711_ao_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct pcl711_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int val = devpriv->ao_readback[chan]; + int i; - devpriv->ao_readback[chan] = data[n]; + for (i = 0; i < insn->n; i++) { + val = data[i]; + pcl711_ao_write(dev, chan, val); } + devpriv->ao_readback[chan] = val; - return n; + return insn->n; } static int pcl711_ao_insn_read(struct comedi_device *dev, @@ -530,7 +532,7 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->n_chan = board->n_aochan; s->maxdata = 0xfff; s->range_table = &range_bipolar5; - s->insn_write = pcl711_ao_insn; + s->insn_write = pcl711_ao_insn_write; s->insn_read = pcl711_ao_insn_read; /* Digital Input subdevice */ @@ -552,12 +554,8 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->insn_bits = pcl711_do_insn_bits; /* clear DAC */ - outb(0, dev->iobase + PCL711_DA0_LO); - outb(0, dev->iobase + PCL711_DA0_HI); - outb(0, dev->iobase + PCL711_DA1_LO); - outb(0, dev->iobase + PCL711_DA1_HI); - - printk(KERN_INFO "\n"); + pcl711_ao_write(dev, 0, 0x0); + pcl711_ao_write(dev, 1, 0x0); return 0; } |