[Bug 213579] Clevo NH55HJ (intel tigerlake) touchpad support (GPIO can't be used as IRQ)

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https://bugzilla.kernel.org/show_bug.cgi?id=213579

--- Comment #29 from Andy Shevchenko (andy.shevchenko@gmail.com) ---
(In reply to wse from comment #28)
> I found a schematic for the Clevo NH5xHP
> 
> According to that the touchpad is connected with 3 wires to the EC and with
> 3 wires to the CPU (and to vcc and gnd ofc):
> 
> TP_CLK -> GPF4/PS2CLK2/5VT (EC)
> TP_DATA -> GPF5/PS2DAT2/5VT (EC)
> TP_I2C_CLK -> BD21 -> GPP_C17/I2C0_SCL
> TP_I2C_DAT -> BC22 -> GPP_C16/I2C0_SDA
> LID_SW# -> GPB1/LID_SW# (EC)
> TP_ATTN# -> BC48 -> GPP_R12/CLKOUT_48
> 
> Looking at
> https://elixir.bootlin.com/linux/v5.13/source/drivers/pinctrl/intel/pinctrl-
> tigerlake.c the CPU pins are:
> PINCTRL_PIN(37, "CLKOUT_48"),
> PINCTRL_PIN(121, "I2C0_SDA"),
> PINCTRL_PIN(122, "I2C0_SCL"),
> 
> I hope this information helps.

Assuming that ATTN# pin is the one that has to be used as IRQ (anybody to look
into TouchPad datasheet?) and the schematic is correct, the pin should be 37
and not 57 (seems like a typo in the BIOS code, typographically 3 and 5 are
close enough).

To test this theory (and it sounds plausible because pin is in GPIO mode and
with out ACPI flag set) one can try to hack the kernel here [1] by doing
something like this:

  /* HACK! HACK! HACK! */
  if (pin == 57)
    pin = 37;

[1]:
https://elixir.bootlin.com/linux/latest/source/drivers/gpio/gpiolib-acpi.c#L127

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