From: H Hartley Sweeten Date: Mon, 25 Aug 2014 23:04:35 +0000 (-0700) Subject: staging: comedi: pcl818: use comedi_subdevice 'readback' X-Git-Tag: firefly_0821_release~176^2~3121^2~1017 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=073d4632600cb76e7452f8eaa25b720fa9a992ca;p=firefly-linux-kernel-4.4.55.git staging: comedi: pcl818: use comedi_subdevice 'readback' Use the new comedi_subdevice 'readback' member and the core provided (*insn_read) for the readback of the analog output subdevice channels. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/pcl818.c b/drivers/staging/comedi/drivers/pcl818.c index 000dbf841e45..36c77518d6e4 100644 --- a/drivers/staging/comedi/drivers/pcl818.c +++ b/drivers/staging/comedi/drivers/pcl818.c @@ -319,7 +319,6 @@ struct pcl818_private { unsigned int act_chanlist_len; /* how long is actual MUX list */ unsigned int act_chanlist_pos; /* actual position in MUX list */ unsigned int ai_data_len; /* len of data buffer */ - unsigned int ao_readback[2]; unsigned int divisor1; unsigned int divisor2; unsigned int usefifo:1; @@ -937,32 +936,18 @@ static int pcl818_ao_insn_write(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data) { - struct pcl818_private *devpriv = dev->private; unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int val = s->readback[chan]; int i; for (i = 0; i < insn->n; i++) { - devpriv->ao_readback[chan] = data[i]; - outb((data[i] & 0x000f) << 4, + val = data[i]; + outb((val & 0x000f) << 4, dev->iobase + PCL818_AO_LSB_REG(chan)); - outb((data[i] & 0x0ff0) >> 4, + outb((val & 0x0ff0) >> 4, dev->iobase + PCL818_AO_MSB_REG(chan)); } - - return insn->n; -} - -static int pcl818_ao_insn_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - struct pcl818_private *devpriv = dev->private; - unsigned int chan = CR_CHAN(insn->chanspec); - int i; - - for (i = 0; i < insn->n; i++) - data[i] = devpriv->ao_readback[chan]; + s->readback[chan] = val; return insn->n; } @@ -1172,8 +1157,6 @@ static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->n_chan = board->n_aochan; s->maxdata = 0x0fff; s->range_table = &range_unipolar5; - s->insn_read = pcl818_ao_insn_read; - s->insn_write = pcl818_ao_insn_write; if (board->is_818) { if ((it->options[4] == 1) || (it->options[4] == 10)) s->range_table = &range_unipolar10; @@ -1185,6 +1168,12 @@ static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it) if (it->options[5] == 2) s->range_table = &range_unknown; } + s->insn_write = pcl818_ao_insn_write; + s->insn_read = comedi_readback_insn_read; + + ret = comedi_alloc_subdev_readback(s); + if (ret) + return ret; } else { s->type = COMEDI_SUBD_UNUSED; }