staging: comedi: adl_pci8164: factor out the PCI device code

Factor out the code that finds a matching PCI device from attach
function. This allows reducing the indent level of the remaining
code in the attach function.

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

diff --git a/drivers/staging/comedi/drivers/adl_pci8164.c b/drivers/staging/comedi/drivers/adl_pci8164.c
index fbc859e6c201016a5043f3848537169aba9c41e3..3447548778928ab172d6a2a299e1ab054b03c86d 100644 (file)
--- a/drivers/staging/comedi/drivers/adl_pci8164.c
+++ b/drivers/staging/comedi/drivers/adl_pci8164.c
@@ -223,19 +223,40 @@ static int adl_pci8164_insn_write_buf1(struct comedi_device *dev,
        return 2;
 }
 
+static struct pci_dev *adl_pci8164_find_pci(struct comedi_device *dev,
+                                           struct comedi_devconfig *it)
+{
+       struct pci_dev *pcidev = NULL;
+       int bus = it->options[0];
+       int slot = it->options[1];
+
+       for_each_pci_dev(pcidev) {
+               if (pcidev->vendor != PCI_VENDOR_ID_ADLINK ||
+                   pcidev->device != PCI_DEVICE_ID_PCI8164)
+                       continue;
+               if (bus || slot) {
+                       /* requested particular bus/slot */
+                       if (pcidev->bus->number != bus ||
+                           PCI_SLOT(pcidev->devfn) != slot)
+                               continue;
+               }
+               return pcidev;
+       }
+       printk(KERN_ERR
+               "comedi%d: no supported board found! (req. bus/slot : %d/%d)\n",
+               dev->minor, bus, slot);
+       return NULL;
+}
+
 static int adl_pci8164_attach(struct comedi_device *dev,
                              struct comedi_devconfig *it)
 {
-       struct pci_dev *pcidev = NULL;
        struct comedi_subdevice *s;
-       int bus, slot;
 
        printk(KERN_INFO "comedi: attempt to attach...\n");
        printk(KERN_INFO "comedi%d: adl_pci8164\n", dev->minor);
 
        dev->board_name = "pci8164";
-       bus = it->options[0];
-       slot = it->options[1];
 
        if (alloc_private(dev, sizeof(struct adl_pci8164_private)) < 0)
                return -ENOMEM;
@@ -243,74 +264,60 @@ static int adl_pci8164_attach(struct comedi_device *dev,
        if (alloc_subdevices(dev, 4) < 0)
                return -ENOMEM;
 
-       for_each_pci_dev(pcidev) {
-               if (pcidev->vendor == PCI_VENDOR_ID_ADLINK &&
-                   pcidev->device == PCI_DEVICE_ID_PCI8164) {
-                       if (bus || slot) {
-                               /* requested particular bus/slot */
-                               if (pcidev->bus->number != bus
-                                       || PCI_SLOT(pcidev->devfn) != slot)
-                                       continue;
-                       }
-                       devpriv->pci_dev = pcidev;
-                       if (comedi_pci_enable(pcidev, "adl_pci8164") < 0) {
-                               printk(KERN_ERR "comedi%d: Failed to enable "
-                               "PCI device and request regions\n", dev->minor);
-                               return -EIO;
-                       }
-                       dev->iobase = pci_resource_start(pcidev, 2);
-                       printk(KERN_DEBUG "comedi: base addr %4lx\n",
-                                  dev->iobase);
-
-                       s = dev->subdevices + 0;
-                       s->type = COMEDI_SUBD_PROC;
-                       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
-                       s->n_chan = 4;
-                       s->maxdata = 0xffff;
-                       s->len_chanlist = 4;
-                       /* s->range_table = &range_axis; */
-                       s->insn_read = adl_pci8164_insn_read_msts;
-                       s->insn_write = adl_pci8164_insn_write_cmd;
-
-                       s = dev->subdevices + 1;
-                       s->type = COMEDI_SUBD_PROC;
-                       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
-                       s->n_chan = 4;
-                       s->maxdata = 0xffff;
-                       s->len_chanlist = 4;
-                       /* s->range_table = &range_axis; */
-                       s->insn_read = adl_pci8164_insn_read_ssts;
-                       s->insn_write = adl_pci8164_insn_write_otp;
-
-                       s = dev->subdevices + 2;
-                       s->type = COMEDI_SUBD_PROC;
-                       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
-                       s->n_chan = 4;
-                       s->maxdata = 0xffff;
-                       s->len_chanlist = 4;
-                       /* s->range_table = &range_axis; */
-                       s->insn_read = adl_pci8164_insn_read_buf0;
-                       s->insn_write = adl_pci8164_insn_write_buf0;
-
-                       s = dev->subdevices + 3;
-                       s->type = COMEDI_SUBD_PROC;
-                       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
-                       s->n_chan = 4;
-                       s->maxdata = 0xffff;
-                       s->len_chanlist = 4;
-                       /* s->range_table = &range_axis; */
-                       s->insn_read = adl_pci8164_insn_read_buf1;
-                       s->insn_write = adl_pci8164_insn_write_buf1;
-
-                       printk(KERN_INFO "comedi: attached\n");
-
-                       return 1;
-               }
-       }
+       devpriv->pci_dev = adl_pci8164_find_pci(dev, it);
+       if (!devpriv->pci_dev)
+               return -EIO;
 
-       printk(KERN_ERR "comedi%d: no supported board found!"
-                  "(req. bus/slot : %d/%d)\n", dev->minor, bus, slot);
-       return -EIO;
+       if (comedi_pci_enable(devpriv->pci_dev, "adl_pci8164") < 0) {
+               printk(KERN_ERR "comedi%d: Failed to enable "
+               "PCI device and request regions\n", dev->minor);
+               return -EIO;
+       }
+       dev->iobase = pci_resource_start(devpriv->pci_dev, 2);
+       printk(KERN_DEBUG "comedi: base addr %4lx\n", dev->iobase);
+
+       s = dev->subdevices + 0;
+       s->type = COMEDI_SUBD_PROC;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->n_chan = 4;
+       s->maxdata = 0xffff;
+       s->len_chanlist = 4;
+       /* s->range_table = &range_axis; */
+       s->insn_read = adl_pci8164_insn_read_msts;
+       s->insn_write = adl_pci8164_insn_write_cmd;
+
+       s = dev->subdevices + 1;
+       s->type = COMEDI_SUBD_PROC;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->n_chan = 4;
+       s->maxdata = 0xffff;
+       s->len_chanlist = 4;
+       /* s->range_table = &range_axis; */
+       s->insn_read = adl_pci8164_insn_read_ssts;
+       s->insn_write = adl_pci8164_insn_write_otp;
+
+       s = dev->subdevices + 2;
+       s->type = COMEDI_SUBD_PROC;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->n_chan = 4;
+       s->maxdata = 0xffff;
+       s->len_chanlist = 4;
+       /* s->range_table = &range_axis; */
+       s->insn_read = adl_pci8164_insn_read_buf0;
+       s->insn_write = adl_pci8164_insn_write_buf0;
+
+       s = dev->subdevices + 3;
+       s->type = COMEDI_SUBD_PROC;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->n_chan = 4;
+       s->maxdata = 0xffff;
+       s->len_chanlist = 4;
+       /* s->range_table = &range_axis; */
+       s->insn_read = adl_pci8164_insn_read_buf1;
+       s->insn_write = adl_pci8164_insn_write_buf1;
+
+       printk(KERN_INFO "comedi: attached\n");
+       return 0;
 }
 
 static void adl_pci8164_detach(struct comedi_device *dev)