On Tuesday 14 April 2015 12:59:24 Mika Westerberg wrote:
> On Tue, Apr 14, 2015 at 12:55:20AM +0200, Gabriele Mazzotta wrote:
> > Hi,
> >
> > my touchpad stopped working because of a485923efbb8 ("HID: i2c-hid:
> > Add support for ACPI GPIO interrupts"). It turned out that I need
> > CONFIG_GPIOLIB. I think this dependency should be made explicit or the
> > driver should not depend on it.
>
> Using GPIOs should be optional. Gpiolib stubs functions out whenever it
> is not enabled.
>
> However, I made a mistake when GPIOs are fed to the driver. If gpiolib
> is not enabled acpi_dev_add_driver_gpios() returns -ENXIO and prevents
> your touchpad from working.
>
> I think it is alright to ignore the error here. Can you try if below
> patch helps?
Sorry for not being more specific. Yes, the problem is that
acpi_dev_add_driver_gpios() returns -ENXIO if CONFIG_GPIOLIB is not set.
> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> index ab4dd952b6ba..b427c11d4cd3 100644
> --- a/drivers/hid/i2c-hid/i2c-hid.c
> +++ b/drivers/hid/i2c-hid/i2c-hid.c
> @@ -877,7 +877,8 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
> pdata->hid_descriptor_address = obj->integer.value;
> ACPI_FREE(obj);
>
> - return acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios);
> + acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios);
> + return 0;
> }
>
> static const struct acpi_device_id i2c_hid_acpi_match[] = {
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