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Код: Выделить всё

    if (dis_dev == NULL) {
        pr_err("No discrete VGA device found\n");
        return -ENODEV;
    }

    if (!skip_optimus_dsm &&
            has_dsm_func(acpi_optimus_dsm_muid, 0x100, 0x1A)) {
        dsm_type = DSM_TYPE_OPTIMUS;
        pr_info("detected an Optimus _DSM function\n");
    } else if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
        dsm_type = DSM_TYPE_NVIDIA;
        pr_info("detected a nVidia _DSM function\n");
    } else {
       /* At least two Acer machines are known to use the intel ACPI handle
        * with the legacy nvidia DSM */
        dis_handle = igd_handle;
        if (dis_handle && has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
            dsm_type = DSM_TYPE_NVIDIA;
            pr_info("detected a nVidia _DSM function on the"
                " integrated video card\n");
        } else {
            pr_err("No suitable _DSM call found.\n");
            return -ENODEV;
        }
    }

    acpi_entry = proc_create("bbswitch", 0664, acpi_root_dir, &bbswitch_fops);
    if (acpi_entry == NULL) {
        pr_err("Couldn't create proc entry\n");
        return -ENOMEM;
    }