From 055a1e2c569d885eedfc4d5bfaf228e653e9285a Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Wed, 16 Oct 2013 14:40:35 +0100 Subject: [PATCH] staging: comedi: rtd520: sample types are unsigned Sample values in comedi are generally represented as unsigned values. Use unsigned types for sample value manipulations in the "rtd520" driver for consistency. Also replace the hand-coded munging of 2's complement sample values with calls to `comedi_offset_munge()` and AND with `s->maxdata` to strip off any extra sign bits. Signed-off-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/rtd520.c | 31 +++++++++++++------------------ 1 file changed, 13 insertions(+), 18 deletions(-) diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c index 3ec6632..0ae2d61 100644 --- a/drivers/staging/comedi/drivers/rtd520.c +++ b/drivers/staging/comedi/drivers/rtd520.c @@ -602,7 +602,7 @@ static int rtd_ai_rinsn(struct comedi_device *dev, /* convert n samples */ for (n = 0; n < insn->n; n++) { - s16 d; + unsigned short d; /* trigger conversion */ writew(0, devpriv->las0 + LAS0_ADC); @@ -621,9 +621,8 @@ static int rtd_ai_rinsn(struct comedi_device *dev, d = d >> 3; /* low 3 bits are marker lines */ if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar, 0)) /* convert to comedi unsigned data */ - data[n] = d + 2048; - else - data[n] = d; + d = comedi_offset_munge(s, d); + data[n] = d & s->maxdata; } /* return the number of samples read/written */ @@ -643,8 +642,7 @@ static int ai_read_n(struct comedi_device *dev, struct comedi_subdevice *s, int ii; for (ii = 0; ii < count; ii++) { - short sample; - s16 d; + unsigned short d; if (0 == devpriv->ai_count) { /* done */ d = readw(devpriv->las1 + LAS1_ADC_FIFO); @@ -654,13 +652,12 @@ static int ai_read_n(struct comedi_device *dev, struct comedi_subdevice *s, d = readw(devpriv->las1 + LAS1_ADC_FIFO); d = d >> 3; /* low 3 bits are marker lines */ if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar, - s->async->cur_chan)) { + s->async->cur_chan)) /* convert to comedi unsigned data */ - sample = d + 2048; - } else - sample = d; + d = comedi_offset_munge(s, d); + d &= s->maxdata; - if (!comedi_buf_put(s->async, sample)) + if (!comedi_buf_put(s->async, d)) return -1; if (devpriv->ai_count > 0) /* < 0, means read forever */ @@ -677,8 +674,7 @@ static int ai_read_dregs(struct comedi_device *dev, struct comedi_subdevice *s) struct rtd_private *devpriv = dev->private; while (readl(devpriv->las0 + LAS0_ADC) & FS_ADC_NOT_EMPTY) { - short sample; - s16 d = readw(devpriv->las1 + LAS1_ADC_FIFO); + unsigned short d = readw(devpriv->las1 + LAS1_ADC_FIFO); if (0 == devpriv->ai_count) { /* done */ continue; /* read rest */ @@ -686,13 +682,12 @@ static int ai_read_dregs(struct comedi_device *dev, struct comedi_subdevice *s) d = d >> 3; /* low 3 bits are marker lines */ if (CHAN_ARRAY_TEST(devpriv->chan_is_bipolar, - s->async->cur_chan)) { + s->async->cur_chan)) /* convert to comedi unsigned data */ - sample = d + 2048; - } else - sample = d; + d = comedi_offset_munge(s, d); + d &= s->maxdata; - if (!comedi_buf_put(s->async, sample)) + if (!comedi_buf_put(s->async, d)) return -1; if (devpriv->ai_count > 0) /* < 0, means read forever */ -- 2.7.4