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Staging: comedi: pcl816: Correct AI scan counting 

For AI commands, the scan counter should be updated after every
scan.  In DMA mode, it was being updated after every repeated
segment of the channel list.  In non-DMA mode, it was being updated
after every sample.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Ian Abbott 2010-01-20 13:04:45 +00:00 committed by Greg Kroah-Hartman
parent 7edfa10689
commit 13de4f000e
1 changed files with 10 additions and 1 deletions
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11
drivers/staging/comedi/drivers/pcl816.c
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@ -202,6 +202,7 @@ struct pcl816_private {
unsigned int ai_act_chanlist[16]; /* MUX setting for actual AI operations */
unsigned int ai_act_chanlist_len; /* how long is actual MUX list */
unsigned int ai_act_chanlist_pos; /* actual position in MUX list */
unsigned int ai_n_chan; /* how many channels per scan */
unsigned int ai_poll_ptr; /* how many sampes transfer poll */
struct comedi_subdevice *sub_ai; /* ptr to AI subdevice */
#ifdef unused
@ -320,7 +321,9 @@ static irqreturn_t interrupt_pcl816_ai_mode13_int(int irq, void *d)
if (++devpriv->ai_act_chanlist_pos >= devpriv->ai_act_chanlist_len)
devpriv->ai_act_chanlist_pos = 0;
if (s->async->cur_chan == 0) {
s->async->cur_chan++;
if (s->async->cur_chan >= devpriv->ai_n_chan) {
s->async->cur_chan = 0;
devpriv->ai_act_scan++;
}
@ -353,6 +356,11 @@ static void transfer_from_dma_buf(struct comedi_device *dev,
if (++devpriv->ai_act_chanlist_pos >=
devpriv->ai_act_chanlist_len) {
devpriv->ai_act_chanlist_pos = 0;
}
s->async->cur_chan++;
if (s->async->cur_chan >= devpriv->ai_n_chan) {
s->async->cur_chan = 0;
devpriv->ai_act_scan++;
}
@ -647,6 +655,7 @@ static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
return -EINVAL;
udelay(1);
devpriv->ai_n_chan = cmd->chanlist_len;
devpriv->ai_act_scan = 0;
s->async->cur_chan = 0;
devpriv->irq_blocked = 1;