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Date: Thu, 9 Aug 2012 14:51:26 -0700
From: H Hartley Sweeten <hartleys@...ionengravers.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
CC: <devel@...verdev.osuosl.org>, <abbotti@....co.uk>,
<gregkh@...uxfoundation.org>
Subject: [PATCH 3/4] staging: comedi: adl_pci6208: split the digital i/o subdevice
The PCI-6208/6216 cards have 4 digital inputs and 4 digital outputs.
These are currently being handled by an 8 channel COMEDI_SUBD_DIO
subdevice in this driver. This causes the 4 digital outputs to
appear as channels 0 thru 3 and the 4 digital inputs to appear as
channels 4 thru 7. Userspace can only work out part thisby doing the
COMEDI_INSNLIST ioctl with the INSN_CONFIG_DIO_QUERY instruction
for each channel to determine the io direction.
Make things a bit cleaner for userspace by creating two subdevices
instead. One for the 4 digital inputs and one for the 4 digital
outputs. For both subdevices the channel number indicates the
actual digital input/output signal.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Ian Abbott <abbotti@....co.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/staging/comedi/drivers/adl_pci6208.c | 78 ++++++++++++++++------------
1 file changed, 44 insertions(+), 34 deletions(-)
diff --git a/drivers/staging/comedi/drivers/adl_pci6208.c b/drivers/staging/comedi/drivers/adl_pci6208.c
index 43e23e1..74695bb 100644
--- a/drivers/staging/comedi/drivers/adl_pci6208.c
+++ b/drivers/staging/comedi/drivers/adl_pci6208.c
@@ -125,46 +125,41 @@ static int pci6208_ao_rinsn(struct comedi_device *dev,
return insn->n;
}
-static int pci6208_dio_insn_bits(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
+static int pci6208_di_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
{
- unsigned int mask = data[0] & PCI6208_DIO_DO_MASK;
+ unsigned int val;
+
+ val = inw(dev->iobase + PCI6208_DIO);
+ val = (val & PCI6208_DIO_DI_MASK) >> PCI6208_DIO_DI_SHIFT;
+
+ data[1] = val;
+
+ return insn->n;
+}
+
+static int pci6208_do_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ unsigned int mask = data[0];
unsigned int bits = data[1];
if (mask) {
s->state &= ~mask;
- s->state |= bits & mask;
+ s->state |= (bits & mask);
outw(s->state, dev->iobase + PCI6208_DIO);
}
- s->state = inw(dev->iobase + PCI6208_DIO);
data[1] = s->state;
return insn->n;
}
-static int pci6208_dio_insn_config(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- int chan = CR_CHAN(insn->chanspec);
- unsigned int mask = 1 << chan;
-
- switch (data[0]) {
- case INSN_CONFIG_DIO_QUERY:
- data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
- break;
- default:
- return -EINVAL;
- }
-
- return insn->n;
-}
-
static const void *pci6208_find_boardinfo(struct comedi_device *dev,
struct pci_dev *pcidev)
{
@@ -185,6 +180,7 @@ static int pci6208_attach_pci(struct comedi_device *dev,
const struct pci6208_board *boardinfo;
struct pci6208_private *devpriv;
struct comedi_subdevice *s;
+ unsigned int val;
int ret;
comedi_set_hw_dev(dev, &pcidev->dev);
@@ -208,7 +204,7 @@ static int pci6208_attach_pci(struct comedi_device *dev,
}
dev->iobase = pci_resource_start(pcidev, 2);
- ret = comedi_alloc_subdevices(dev, 2);
+ ret = comedi_alloc_subdevices(dev, 3);
if (ret)
return ret;
@@ -223,17 +219,31 @@ static int pci6208_attach_pci(struct comedi_device *dev,
s->insn_read = pci6208_ao_rinsn;
s = dev->subdevices + 1;
- /* digital i/o subdevice */
- s->type = COMEDI_SUBD_DIO;
- s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
- s->n_chan = 8;
+ /* digital input subdevice */
+ s->type = COMEDI_SUBD_DI;
+ s->subdev_flags = SDF_READABLE;
+ s->n_chan = 4;
s->maxdata = 1;
s->range_table = &range_digital;
- s->insn_bits = pci6208_dio_insn_bits;
- s->insn_config = pci6208_dio_insn_config;
+ s->insn_bits = pci6208_di_insn_bits;
+ s = dev->subdevices + 2;
+ /* digital output subdevice */
+ s->type = COMEDI_SUBD_DO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = 4;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = pci6208_do_insn_bits;
+
+ /*
+ * Get the read back signals from the digital outputs
+ * and save it as the initial state for the subdevice.
+ */
+ val = inw(dev->iobase + PCI6208_DIO);
+ val = (val & PCI6208_DIO_DO_MASK) >> PCI6208_DIO_DO_SHIFT;
+ s->state = val;
s->io_bits = 0x0f;
- s->state = inw(dev->iobase + PCI6208_DIO);
dev_info(dev->class_dev, "%s: %s, I/O base=0x%04lx\n",
dev->driver->driver_name, dev->board_name, dev->iobase);
--
1.7.11
--
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