staging: comedi: adl_pci6208: refactor pci6208_find_device()

Make the "find pci device" functions consistent in the comedi
drivers. Hopefully well be able to move it into the core...

Refactor the "find pci device" function to return a pointer to
the found struct pci_dev instead of an error code. Also, change
some of the tests to reduce the indent level of the code. Pass
the struct comedi_devconfig pointer to the function instead of
the bus/slot numbers.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/adl_pci6208.c b/drivers/staging/comedi/drivers/adl_pci6208.c
index 720f870..5f073c5 100644 (file)
--- a/drivers/staging/comedi/drivers/adl_pci6208.c
+++ b/drivers/staging/comedi/drivers/adl_pci6208.c
@@ -178,60 +178,43 @@ static int pci6208_ao_rinsn(struct comedi_device *dev,
 /* return 1; */
 /* } */
 
-static int pci6208_find_device(struct comedi_device *dev, int bus, int slot)
+static struct pci_dev *pci6208_find_device(struct comedi_device *dev,
+                                          struct comedi_devconfig *it)
 {
-       struct pci6208_private *devpriv = dev->private;
+       const struct pci6208_board *thisboard;
        struct pci_dev *pci_dev = NULL;
+       int bus = it->options[0];
+       int slot = it->options[1];
        int i;
 
        for_each_pci_dev(pci_dev) {
-               if (pci_dev->vendor == PCI_VENDOR_ID_ADLINK) {
-                       for (i = 0; i < ARRAY_SIZE(pci6208_boards); i++) {
-                               if (pci6208_boards[i].dev_id ==
-                                       pci_dev->device) {
-                                       /*
-                                        * was a particular bus/slot requested?
-                                       */
-                                       if ((bus != 0) || (slot != 0)) {
-                                               /*
-                                                * are we on the
-                                                * wrong bus/slot?
-                                               */
-                                               if (pci_dev->bus->number
-                                                   != bus ||
-                                                   PCI_SLOT(pci_dev->devfn)
-                                                   != slot) {
-                                                       continue;
-                                               }
-                                       }
-                                       dev->board_ptr = pci6208_boards + i;
-                                       goto found;
-                               }
+               if (pci_dev->vendor != PCI_VENDOR_ID_ADLINK)
+                       continue;
+               for (i = 0; i < ARRAY_SIZE(pci6208_boards); i++) {
+                       thisboard = &pci6208_boards[i];
+                       if (thisboard->dev_id != pci_dev->device)
+                               continue;
+                       /* was a particular bus/slot requested? */
+                       if (bus || slot) {
+                               /* are we on the wrong bus/slot? */
+                               if (pci_dev->bus->number != bus ||
+                                   PCI_SLOT(pci_dev->devfn) != slot)
+                                       continue;
                        }
+                       dev_dbg(dev->class_dev,
+                               "Found %s on bus %d, slot, %d, irq=%d\n",
+                               thisboard->name,
+                               pci_dev->bus->number,
+                               PCI_SLOT(pci_dev->devfn),
+                               pci_dev->irq);
+                       dev->board_ptr = thisboard;
+                       return pci_dev;
                }
        }
-
-       printk(KERN_ERR "comedi%d: no supported board found! "
-                       "(req. bus/slot : %d/%d)\n",
-                       dev->minor, bus, slot);
-       return -EIO;
-
-found:
-       printk("comedi%d: found %s (b:s:f=%d:%d:%d) , irq=%d\n",
-              dev->minor,
-              pci6208_boards[i].name,
-              pci_dev->bus->number,
-              PCI_SLOT(pci_dev->devfn),
-              PCI_FUNC(pci_dev->devfn), pci_dev->irq);
-
-       /*  TODO: Warn about non-tested boards. */
-       /* switch(board->device_id) */
-       /* { */
-       /* }; */
-
-       devpriv->pci_dev = pci_dev;
-
-       return 0;
+       dev_err(dev->class_dev,
+               "No supported board found! (req. bus %d, slot %d)\n",
+               bus, slot);
+       return NULL;
 }
 
 static int
@@ -289,9 +272,9 @@ static int pci6208_attach(struct comedi_device *dev,
                return retval;
        devpriv = dev->private;
 
-       retval = pci6208_find_device(dev, it->options[0], it->options[1]);
-       if (retval < 0)
-               return retval;
+       devpriv->pci_dev = pci6208_find_device(dev, it);
+       if (!devpriv->pci_dev)
+               return -EIO;
        thisboard = comedi_board(dev);
 
        retval = pci6208_pci_setup(devpriv->pci_dev, &io_base, dev->minor);