hyperv-fb: add pci stub

This patch adds a pci stub driver to hyper-fb.  The hyperv framebuffer
driver will bind to the pci device then, so linux kernel and userspace
know there is a proper kernel driver for the device active.  lspci shows
this for example:

[root@dhcp231 ~]# lspci -vs8
00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual
VGA (prog-if 00 [VGA controller])
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at f8000000 (32-bit, non-prefetchable) [size=64M]
        Expansion ROM at <unassigned> [disabled]
        Kernel driver in use: hyperv_fb

Another effect is that the xorg vesa driver will not attach to the
device and thus the Xorg server will automatically use the fbdev
driver instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c
index 8ac99b87c07e..8d456dc449b8 100644
--- a/drivers/video/hyperv_fb.c
+++ b/drivers/video/hyperv_fb.c
@@ -795,12 +795,21 @@ static int hvfb_remove(struct hv_device *hdev)
 }
 
 
+static DEFINE_PCI_DEVICE_TABLE(pci_stub_id_table) = {
+        {
+                .vendor      = PCI_VENDOR_ID_MICROSOFT,
+                .device      = PCI_DEVICE_ID_HYPERV_VIDEO,
+        },
+        { /* end of list */ }
+};
+
 static const struct hv_vmbus_device_id id_table[] = {
         /* Synthetic Video Device GUID */
         {HV_SYNTHVID_GUID},
         {}
 };
 
+MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
 MODULE_DEVICE_TABLE(vmbus, id_table);
 
 static struct hv_driver hvfb_drv = {
@@ -810,14 +819,43 @@ static struct hv_driver hvfb_drv = {
         .remove = hvfb_remove,
 };
 
+static int hvfb_pci_stub_probe(struct pci_dev *pdev,
+                               const struct pci_device_id *ent)
+{
+        return 0;
+}
+
+static void hvfb_pci_stub_remove(struct pci_dev *pdev)
+{
+}
+
+static struct pci_driver hvfb_pci_stub_driver = {
+        .name =         KBUILD_MODNAME,
+        .id_table =     pci_stub_id_table,
+        .probe =        hvfb_pci_stub_probe,
+        .remove =       hvfb_pci_stub_remove,
+};
 
 static int __init hvfb_drv_init(void)
 {
-        return vmbus_driver_register(&hvfb_drv);
+        int ret;
+
+        ret = vmbus_driver_register(&hvfb_drv);
+        if (ret != 0)
+                return ret;
+
+        ret = pci_register_driver(&hvfb_pci_stub_driver);
+        if (ret != 0) {
+                vmbus_driver_unregister(&hvfb_drv);
+                return ret;
+        }
+
+        return 0;
 }
 
 static void __exit hvfb_drv_exit(void)
 {
+        pci_unregister_driver(&hvfb_pci_stub_driver);
         vmbus_driver_unregister(&hvfb_drv);
 }