diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-06-20 13:12:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-26 20:08:19 -0400 |
| commit | 9504be8a1b84d5139f7475c0e705bc0630e82dc9 (patch) | |
| tree | b9cc98d22485d648062d56baaa1ec926cfbefcee /drivers | |
| parent | de91bb97254cec30f24b4f770e10eab7da3f6be1 (diff) | |
staging: comedi: dt282x: fix dt282x_ao_insn_read()
The comedi core expects the (*insn_read) functions to return 'insn->n'
samples. Fix this function to work like the core expects.
For aesthetics, rename the private data 'ao' member to clarify its
use. Also, remove the unnecessary comment.
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/comedi/drivers/dt282x.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c index d4164ced8185..f248dbcc3c70 100644 --- a/drivers/staging/comedi/drivers/dt282x.c +++ b/drivers/staging/comedi/drivers/dt282x.c @@ -326,7 +326,7 @@ struct dt282x_private { const struct comedi_lrange *darangelist[2]; - unsigned short ao[2]; + unsigned short ao_readback[2]; int dacsr; /* software copies of registers */ int adcsr; @@ -828,21 +828,19 @@ static int dt282x_ai_cancel(struct comedi_device *dev, return 0; } -/* - * Analog output routine. Selects single channel conversion, - * selects correct channel, converts from 2's compliment to - * offset binary if necessary, loads the data into the DAC - * data register, and performs the conversion. - */ static int dt282x_ao_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { struct dt282x_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + int i; - data[0] = devpriv->ao[CR_CHAN(insn->chanspec)]; + for (i = 0; i < insn->n; i++) + data[i] = devpriv->ao_readback[chan]; - return 1; + return insn->n; } static int dt282x_ao_insn_write(struct comedi_device *dev, @@ -869,7 +867,7 @@ static int dt282x_ao_insn_write(struct comedi_device *dev, for (i = 0; i < insn->n; i++) { val = data[i]; - devpriv->ao[chan] = val; + devpriv->ao_readback[chan] = val; if (munge) val = comedi_offset_munge(s, val); |