linux-kernel - Re: [PATCH 0/1] input: keyboard: add qci keyboard driver

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Date:	Tue, 31 Aug 2010 23:34:30 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Neil Leeder <nleeder@...eaurora.org>
Cc:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Horace Fu <horace.fu@...ntatw.com>, Hsin.Wu@...ntatw.com,
	mcuos.com@...il.com
Subject: Re: [PATCH 0/1] input: keyboard: add qci keyboard driver

On Tue, Aug 31, 2010 at 04:54:47PM -0400, Neil Leeder wrote:
> On 8/30/2010 5:55 PM, Dmitry Torokhov wrote:
> >And still you are using only one GPIO in your driver? While WPCE775x
> >does seem to have matrix keypad support I think that you are using one
> >of the 3 PS/2 ports, like your touchpad does.
> 
> Hi Dmitry,
> 
> I can assure you that the keyboard is on the 8*18 GPIO matrix on the
> Nuvoton EC (only 8*16 being used in the current design). There
> certainly are 3 PS/2 ports on the EC, but in the board designs I
> have only one of those is used as a PS/2 port, and that is for the
> touchpad. The other two ports are muxed with GPIOs and the pins are
> being used as GPIOs for other functions, not PS/2 ports.
> 
> The firmware on the EC converts keypresses on the GPIO matrix to
> scancodes and sends them over I2C. The single GPIO used by the
> keyboard driver is an interrupt.
> 
> >The device is initialized with 0xf4; the device is supposed to respond
> >with 0xfa; I wonder what scancodes the device reports... It smells
> >strongly of PS/2.
> >
> >Also, it is not controller that supports PS/2 commands but rather the
> >device itself so I am still hopeful that we could make use of the
> >standard drivers.
> 
> We can speculate on the reasons that the firmware on the EC uses
> 0xF4 & 0xFA for init and ack - my guess would be for a minimal
> amount of commonality with the PS/2 protocol - but it doesn't
> emulate the rest of the PS/2 protocol for the GPIO matrix device. I
> tried with atkbd. It issues reset, getid, setleds - all of which
> fail with no response from the EC. It only responds to F4.

OK, I give up on pursuit of serio solution. Again ;)

> 
> The scancodes reported are whatever the firmware provides. A
> previous version of firmware had some non-standard values and the
> driver had to use a look-up table to convert them to something
> useful. With the change to the current keyboard layout Quanta
> changed the scancodes reported to match the KEY_* values in input.h,
> which is why there is no table in the current driver.

I believe we still should support changing keymap via EVIOCSKEYCODE so
we need to have the keymap even though the initial seed is 1:1 with
scancodes.

-- 
Dmitry
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