[PATCH 072/108] staging: comedi: addi_apci_3120: enable chanlist scanning if needed

[H Hartley Sweeten]

The 'SCAN_ENA' bit in the mode register needs to be set if the chanlist
has more than 1 channel. Set the bit in apci3120_set_chanlist() if needed.
The callers write the mode register after setting any additional bits,

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/addi_apci_3120.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index f258ceb..ec66233 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -307,6 +307,10 @@ static void apci3120_set_chanlist(struct comedi_device *dev,
 	/* set scan length (PR) and scan start (PA) */
 	devpriv->ctrl = APCI3120_CTRL_PR(n_chan - 1) | APCI3120_CTRL_PA(0);
 	outw(devpriv->ctrl, dev->iobase + APCI3120_CTRL_REG);
+
+	/* enable chanlist scanning if necessary */
+	if (n_chan > 1)
+		devpriv->mode |= APCI3120_MODE_SCAN_ENA;
 }
 
 #include "addi-data/hwdrv_apci3120.c"
-- 
2.0.3