[PATCH:libpciaccess] Implement the kernel_has_driver() method for NetBSD.

[Thomas Klausner]

From: Matthew Green <mrg at NetBSD.org>

This has the benefit of stopping the "vesa" driver from loading on
hardware that has been claimed by a kernel driver and thus shouldn't
be using "vesa".

Signed-off-by: Thomas Klausner <wiz at NetBSD.org>
---
 src/netbsd_pci.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/netbsd_pci.c b/src/netbsd_pci.c
index e6dae4c..52591b0 100644
--- a/src/netbsd_pci.c
+++ b/src/netbsd_pci.c
@@ -843,6 +843,29 @@ pci_device_netbsd_unmap_legacy(struct pci_device *dev, void *addr,
 	return pci_device_netbsd_unmap_range(dev, &map);
 }
 
+static int
+pci_device_netbsd_has_kernel_driver(struct pci_device *dev)
+{
+#ifdef PCI_IOC_DRVNAME
+	/*
+	 * NetBSD PCI_IOC_DRVNAME appears at the same time as pci_drvname(3)
+	 */
+	char drvname[16];
+
+	if (dev->bus >= nbuses)
+		return 0;
+
+	/*
+	 * vga(4) should be considered "not bound".
+	 */
+	if (pci_drvname(buses[dev->bus].fd, dev->dev, dev->func,
+			drvname, sizeof drvname) == 0 &&
+	    strncmp(drvname, "vga", 3) != 0)
+		return 1;
+#endif
+	return 0;
+}
+
 static const struct pci_system_methods netbsd_pci_methods = {
 	.destroy = pci_system_netbsd_destroy,
 	.destroy_device = NULL,
@@ -867,6 +890,7 @@ static const struct pci_system_methods netbsd_pci_methods = {
 	.write8 = pci_device_netbsd_write8,
 	.map_legacy = pci_device_netbsd_map_legacy,
 	.unmap_legacy = pci_device_netbsd_unmap_legacy,
+	.has_kernel_driver = pci_device_netbsd_has_kernel_driver,
 };
 
 int
-- 
1.9.4