commit ad83dbd974feb2e2a8cc071a1d28782bd4d2c70e upstream
The "adl_pci7x3x" driver replaced the "adl_pci7230" and "adl_pci7432"
drivers in commits 8f567c373c4b ("staging: comedi: new adl_pci7x3x
driver") and 657f77d173d3 ("staging: comedi: remove adl_pci7230 and
adl_pci7432 drivers"). Although the new driver code agrees with the
user manuals for the respective boards, digital outputs stopped working
on the PCI-7230. This has 16 digital output channels and the previous
adl_pci7230 driver shifted the 16 bit output state left by 16 bits
before writing to the hardware register. The new adl_pci7x3x driver
doesn't do that. Fix it in `adl_pci7x3x_do_insn_bits()` by checking
for the special case of the subdevice having only 16 channels and
duplicating the 16 bit output state into both halves of the 32-bit
register. That should work both for what the board actually does and
for what the user manual says it should do.
Fixes: 8f567c373c4b ("staging: comedi: new adl_pci7x3x driver")
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
drivers/staging/comedi/drivers/adl_pci7x3x.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/adl_pci7x3x.c b/drivers/staging/comedi/drivers/adl_pci7x3x.c
index 81b7203..c570ede 100644
--- a/drivers/staging/comedi/drivers/adl_pci7x3x.c
+++ b/drivers/staging/comedi/drivers/adl_pci7x3x.c
@@ -116,10 +116,21 @@ static int adl_pci7x3x_do_insn_bits(struct comedi_device *dev,
unsigned int bits = data[1];
if (mask) {
+ unsigned int val;
+
s->state &= ~mask;
s->state |= (bits & mask);
-
- outl(s->state, dev->iobase + reg);
+ val = s->state;
+ if (s->n_chan == 16) {
+ /*
+ * It seems the PCI-7230 needs the 16-bit DO state
+ * to be shifted left by 16 bits before being written
+ * to the 32-bit register. Set the value in both
+ * halves of the register to be sure.
+ */
+ val |= val << 16;
+ }
+ outl(val, dev->iobase + reg);
}
/*
--
2.5.1
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