Build errors if CONFIG_SONY_LAPTOP && !INPUT or
if CONFIG_THINKPAD_ACPI && !INPUT:
 LD      vmlinux
    ...
drivers/built-in.o: In function `sony_laptop_remove_input':
sony-laptop.c:(.text+0x768fb): undefined reference to `input_unregister_device'
    ...
drivers/built-in.o: In function `thinkpad_acpi_module_exit':
thinkpad_acpi.c:(.text+0x78c1b): undefined reference to `input_free_device'
    ...
Signed-off-by: Andreas Herrmann <aherrman@arcor.de>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
        tristate "Sony Laptop Extras"
        depends on X86 && ACPI
        select BACKLIGHT_CLASS_DEVICE
+       depends on INPUT
          ---help---
          This mini-driver drives the SNC and SPIC devices present in the ACPI
          BIOS of the Sony Vaio laptops.
        select BACKLIGHT_CLASS_DEVICE
        select HWMON
        select NVRAM
+       depends on INPUT
        ---help---
          This is a driver for the IBM and Lenovo ThinkPad laptops. It adds
          support for Fn-Fx key combinations, Bluetooth control, video