unbind/bind device from/to driver

echo -n manual > /sys/bus/serio/devices/serio1/bind_mode
echo -n serio1 > /sys/bus/serio/drivers/psmouse/unbind

echo -n manual > /sys/bus/serio/devices/serio1/bind_mode
echo -n none > /sys/bus/serio/drivers/psmouse/drvctl

echo -n auto > /sys/bus/serio/devices/serio1/bind_mode
echo -n reconnect > /sys/bus/serio/drivers/psmouse/drvctl

echo -n manual > /sys/bus/serio/devices/serio1/bind_mode
echo -n psmouse > /sys/bus/serio/devices/serio1/drvctl

    if (fDetach)
    {
        char*              szCmdBuf;
        char*              szFileBuf;
        struct file*       pFile;
        int                iCmdLen;
        const int          cMaxBuf = 128;
        const struct cred *pOldCreds;
        struct cred       *pNewCreds;

        /*
         * Now perform kernel analog of:
         *
         * echo -n "10de 040a" > /sys/bus/pci/drivers/pci-stub/new_id
         * echo -n 0000:03:00.0 > /sys/bus/pci/drivers/nvidia/unbind
         * echo -n 0000:03:00.0 > /sys/bus/pci/drivers/pci-stub/bind
         *
         * We do this way, as this interface is presumingly more stable than
         * in-kernel ones.
         */
        szCmdBuf  = kmalloc(cMaxBuf, GFP_KERNEL);
        szFileBuf = kmalloc(cMaxBuf, GFP_KERNEL);
        if (!szCmdBuf || !szFileBuf)
            goto done;

        /* Somewhat ugly hack - override current credentials */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
        pNewCreds = prepare_creds();
        if (!pNewCreds)
                goto done;

        pNewCreds->fsuid = 0;
        pOldCreds = override_creds(pNewCreds);
#endif

        RTStrPrintf(szFileBuf, cMaxBuf,
                              "/sys/bus/pci/drivers/%s/new_id",
                              PCI_STUB_MODULE);
        pFile = vboxPciFileOpen(szFileBuf, O_WRONLY);
        if (pFile)
        {
            iCmdLen = RTStrPrintf(szCmdBuf, cMaxBuf,
                                  "%04x %04x",
                                  uVendor, uDevice);
            /* Don't write trailing \0 */
            vboxPciFileWrite(pFile, 0, szCmdBuf, iCmdLen);
            vboxPciFileClose(pFile);
        }
        else
            printk(KERN_DEBUG "vboxpci: cannot open %s\n", szFileBuf);

        iCmdLen = RTStrPrintf(szCmdBuf, cMaxBuf,
                              "0000:%02x:%02x.%d",
                              uBus, uDevFn>>3, uDevFn&7);

        /* Unbind if bound to smth */
        if (pIns->szPrevDriver[0])
        {
            RTStrPrintf(szFileBuf, cMaxBuf,
                        "/sys/bus/pci/drivers/%s/unbind",
                         pIns->szPrevDriver);
            pFile = vboxPciFileOpen(szFileBuf, O_WRONLY);
            if (pFile)
            {

                /* Don't write trailing \0 */
                vboxPciFileWrite(pFile, 0, szCmdBuf, iCmdLen);
                vboxPciFileClose(pFile);
            }
            else
                printk(KERN_DEBUG "vboxpci: cannot open %s\n", szFileBuf);
        }

        RTStrPrintf(szFileBuf, cMaxBuf,
                    "/sys/bus/pci/drivers/%s/bind",
                    PCI_STUB_MODULE);
        pFile = vboxPciFileOpen(szFileBuf, O_WRONLY);
        if (pFile)
        {
            /* Don't write trailing \0 */
            vboxPciFileWrite(pFile, 0, szCmdBuf, iCmdLen);
            vboxPciFileClose(pFile);
        }
        else
            printk(KERN_DEBUG "vboxpci: cannot open %s\n", szFileBuf);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
        revert_creds(pOldCreds);
        put_cred(pNewCreds);
#endif

      done:
        kfree(szCmdBuf);
        kfree(szFileBuf);
    }