On Tue, Feb 25, 2014 at 12:00 AM, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> wrote: > Sometimes it is useful to allow GPIO chips themselves to request GPIOs they > own through gpiolib API. One usecase is ACPI ASL code that should be able > to toggle GPIOs through GPIO operation regions. > > We can't really use gpio_request() and its counterparts because it will pin > the module to the kernel forever (as it calls module_get()). Instead we > provide a gpiolib internal functions gpiochip_request/free_own_desc() that > work the same as gpio_request() but don't manipulate module refrence count. > > Since it's the GPIO chip driver who requests the GPIOs in the first place > we can be sure that it cannot be unloaded without the driver knowing about > that. Furthermore we only limit this functionality to be available only > inside gpiolib. > > Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> I fully trust you in doing the ACPI stuff in patches 2-n but on this patch in particular I want Alexandre's review tag as well, as he's working actively with the descriptor API and I don't want to add too many quirks without his consent. So Alexandre, what do you say about this? Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
