From 081b6ee6f1060517a9bcee26418c8ae762c7410e Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 25 Aug 2014 16:04:55 -0700 Subject: [PATCH] staging: comedi: me4000: 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 --- drivers/staging/comedi/drivers/me4000.c | 30 +++++-------------------- 1 file changed, 6 insertions(+), 24 deletions(-) diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c index d20b50806583..3e812f0e32c1 100644 --- a/drivers/staging/comedi/drivers/me4000.c +++ b/drivers/staging/comedi/drivers/me4000.c @@ -176,8 +176,6 @@ broken. struct me4000_info { unsigned long plx_regbase; unsigned long timer_regbase; - - unsigned int ao_readback[4]; }; enum me4000_boardid { @@ -1193,7 +1191,6 @@ static int me4000_ao_insn_write(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data) { - struct me4000_info *info = dev->private; int chan = CR_CHAN(insn->chanspec); unsigned int tmp; @@ -1209,26 +1206,7 @@ static int me4000_ao_insn_write(struct comedi_device *dev, outl(data[0], dev->iobase + ME4000_AO_SINGLE_REG(chan)); /* Store in the mirror */ - info->ao_readback[chan] = data[0]; - - return 1; -} - -static int me4000_ao_insn_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - struct me4000_info *info = dev->private; - int chan = CR_CHAN(insn->chanspec); - - if (insn->n == 0) { - return 0; - } else if (insn->n > 1) { - dev_err(dev->class_dev, "Invalid instruction length\n"); - return -EINVAL; - } - - data[0] = info->ao_readback[chan]; + s->readback[chan] = data[0]; return 1; } @@ -1478,7 +1456,11 @@ static int me4000_auto_attach(struct comedi_device *dev, s->maxdata = 0xFFFF; /* 16 bit DAC */ s->range_table = &range_bipolar10; s->insn_write = me4000_ao_insn_write; - s->insn_read = me4000_ao_insn_read; + s->insn_read = comedi_readback_insn_read; + + result = comedi_alloc_subdev_readback(s); + if (result) + return result; } else { s->type = COMEDI_SUBD_UNUSED; } -- 2.30.2