staging: comedi: dt3000: convert driver to attach_pci

Convert this driver to use the comedi PCI auto config mechanism
by adding an attach_pci callback.

Since this driver requires no extra configuration options, and
the attach callback is now optional, remove it.

Remove the kernel noise that is output when the attach fails
for various reasons.

Use the found 'dev->board_name' for the resource name passed to
comedi_pci_enable() and request_irq().

Pass on the error returned from request_irq() instead of returning
-EINVAL on error.

Since this driver no longer walks the pci bus to find the pci_dev,
remove the pci_dev_put() in the detach.
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>

drivers/staging/comedi/drivers/dt3000.c

@@ -29,11 +29,7 @@ Devices: [Data Translation] DT3001 (dt3000), DT3001-PGL, DT3002, DT3003,
 Updated: Mon, 14 Apr 2008 15:41:24 +0100
 Status: works
 
-Configuration Options:
-  [0] - PCI bus of device (optional)
-  [1] - PCI slot of device (optional)
-  If bus/slot is not specified, the first supported
-  PCI device found will be used.
+Configuration Options: not applicable, uses PCI auto config
 
 There is code to support AI commands, but it may not work.
 
@@ -764,58 +760,41 @@ static int dt3k_mem_insn_read(struct comedi_device *dev,
 	return i;
 }
 
-static struct pci_dev *dt3000_find_pci_dev(struct comedi_device *dev,
-					   struct comedi_devconfig *it)
+static const void *dt3000_find_boardinfo(struct comedi_device *dev,
+					 struct pci_dev *pcidev)
 {
-	struct pci_dev *pcidev = NULL;
-	int bus = it->options[0];
-	int slot = it->options[1];
+	const struct dt3k_boardtype *this_board;
 	int i;
 
-	for_each_pci_dev(pcidev) {
-		if (bus || slot) {
-			if (bus != pcidev->bus->number ||
-			    slot != PCI_SLOT(pcidev->devfn))
-				continue;
-		}
-		if (pcidev->vendor != PCI_VENDOR_ID_DT)
-			continue;
 	for (i = 0; i < ARRAY_SIZE(dt3k_boardtypes); i++) {
-			if (dt3k_boardtypes[i].device_id != pcidev->device)
-				continue;
-			dev->board_ptr = dt3k_boardtypes + i;
-			return pcidev;
-		}
+		this_board = &dt3k_boardtypes[i];
+		if (this_board->device_id == pcidev->device)
+			return this_board;
 	}
-	dev_err(dev->class_dev,
-		"No supported board found! (req. bus %d, slot %d)\n",
-		bus, slot);
 	return NULL;
 }
 
-static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+static int dt3000_attach_pci(struct comedi_device *dev,
+			     struct pci_dev *pcidev)
 {
 	const struct dt3k_boardtype *this_board;
 	struct dt3k_private *devpriv;
-	struct pci_dev *pcidev;
 	struct comedi_subdevice *s;
 	resource_size_t pci_base;
 	int ret = 0;
 
-	dev_dbg(dev->class_dev, "dt3000:\n");
+	this_board = dt3000_find_boardinfo(dev, pcidev);
+	if (!this_board)
+		return -ENODEV;
+	dev->board_ptr = this_board;
+	dev->board_name = this_board->name;
 
 	devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 	if (!devpriv)
 		return -ENOMEM;
 	dev->private = devpriv;
 
-	pcidev = dt3000_find_pci_dev(dev, it);
-	if (!pcidev)
-		return -EIO;
-	comedi_set_hw_dev(dev, &pcidev->dev);
-	this_board = comedi_board(dev);
-
-	ret = comedi_pci_enable(pcidev, "dt3000");
+	ret = comedi_pci_enable(pcidev, dev->board_name);
 	if (ret < 0)
 		return ret;
 	dev->iobase = 1;	/* the "detach" needs this */
@@ -825,14 +804,10 @@ static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	if (!devpriv->io_addr)
 		return -ENOMEM;
 
-	dev->board_name = this_board->name;
-
-	if (request_irq(pcidev->irq, dt3k_interrupt, IRQF_SHARED,
-			"dt3000", dev)) {
-		dev_err(dev->class_dev, "unable to allocate IRQ %u\n",
-			pcidev->irq);
-		return -EINVAL;
-	}
+	ret = request_irq(pcidev->irq, dt3k_interrupt, IRQF_SHARED,
+			  dev->board_name, dev);
+	if (ret)
+		return ret;
 	dev->irq = pcidev->irq;
 
 	ret = comedi_alloc_subdevices(dev, 4);
@@ -909,14 +884,13 @@ static void dt3000_detach(struct comedi_device *dev)
 	if (pcidev) {
 		if (dev->iobase)
 			comedi_pci_disable(pcidev);
-		pci_dev_put(pcidev);
 	}
 }
 
 static struct comedi_driver dt3000_driver = {
 	.driver_name	= "dt3000",
 	.module		= THIS_MODULE,
-	.attach		= dt3000_attach,
+	.attach_pci	= dt3000_attach_pci,
 	.detach		= dt3000_detach,
 };