From 83a69f5adb81b3432fb1e58485639c391cc65f17 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Tue, 14 May 2013 14:33:09 -0700 Subject: [PATCH] staging: comedi: dt9812: cleanup analog in subdevice (*insn_read) For aesthetic reasons, rename the function to help with grepping and rename some of the local vars. dt9812_analog_in() can fail. Make sure to check for any failure and return the errno. The comedi core expects the (*insn_read) functions to return either an errno or the number of samples read. Change the final return to insn->n to make this clearer. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/dt9812.c | 28 ++++++++++++++----------- 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/staging/comedi/drivers/dt9812.c b/drivers/staging/comedi/drivers/dt9812.c index 7f6d43a33de3..c83dc7f7e9f4 100644 --- a/drivers/staging/comedi/drivers/dt9812.c +++ b/drivers/staging/comedi/drivers/dt9812.c @@ -631,20 +631,24 @@ static int dt9812_do_insn_bits(struct comedi_device *dev, return insn->n; } -static int dt9812_ai_rinsn(struct comedi_device *dev, - struct comedi_subdevice *s, struct comedi_insn *insn, - unsigned int *data) +static int dt9812_ai_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) { - unsigned int channel = CR_CHAN(insn->chanspec); - int n; - - for (n = 0; n < insn->n; n++) { - u16 value = 0; + unsigned int chan = CR_CHAN(insn->chanspec); + u16 val = 0; + int ret; + int i; - dt9812_analog_in(dev, channel, &value, DT9812_GAIN_1); - data[n] = value; + for (i = 0; i < insn->n; i++) { + ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1); + if (ret) + return ret; + data[i] = val; } - return n; + + return insn->n; } static int dt9812_ao_rinsn(struct comedi_device *dev, @@ -845,7 +849,7 @@ static int dt9812_auto_attach(struct comedi_device *dev, s->n_chan = 8; s->maxdata = 0x0fff; s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10; - s->insn_read = dt9812_ai_rinsn; + s->insn_read = dt9812_ai_insn_read; /* Analog Output subdevice */ s = &dev->subdevices[3]; -- 2.20.1