linux-kernel - RE: [PATCH v2] Support Elan Touchscreen eKTF product.

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Date:	Thu, 25 Oct 2012 12:32:39 +0800
From:	劉嘉駿 <scott.liu@....com.tw>
To:	"'Dmitry Torokhov'" <dmitry.torokhov@...il.com>
Cc:	<linux-input@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"'Benjamin Tissoires'" <benjamin.tissoires@...il.com>,
	"'Jesse'" <jesse@....com.tw>,
	"'Vincent Wang'" <vincent.wang@....com.tw>,
	"'Paul'" <paul.liang@....com.tw>
Subject: RE: [PATCH v2] Support Elan Touchscreen eKTF product.

Hi Dmitry,
	Thanks for review.

> -----Original Message-----
> From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
> Sent: Thursday, October 25, 2012 2:13 AM
> To: Scott Liu
> Cc: linux-input@...r.kernel.org; linux-i2c@...r.kernel.org;
linux-kernel@...r.kernel.org;
> Benjamin Tissoires; Jesse; Vincent Wang; Paul
> Subject: Re: [PATCH v2] Support Elan Touchscreen eKTF product.
> 
> Hi Scott,
> 
> On Wed, Oct 24, 2012 at 09:41:43AM +0800, Scott Liu wrote:
> > This patch is for Elan eKTF Touchscreen product, I2C adpater module.
> >
> > Signed-off-by: Scott Liu <scott.liu@....com.tw>
> > ---
> >
> > Hi,
> >         v2 revision I have fixed some bug as your advise.
> >         1. To target the mainline
> >         2. No Android dependency
> >         3. reuse those duplication code from Henrik's patchset.
> >                 (input_mt_sync_frame()  / input_mt_get_slot_by_key())
> 
> Just a quick run through the code, so:
> 
> - please remove polling support, it is not useful in production;

OK.

> - why do you need a separate probe work instead of doing what you
>   need in elants_probe()

will fix.

> - it is not a good idea to register input device first and then
>   allocating memory for MT handling.

Ooop...will fix.

> - I do not understand why kfifo is needed

The firmware and the host would conflict by read command and finger report
simultaneously. So I'm simply using kfifo in IRQ thread function.

* read command: writing 4 bytes commands and the device asserts GPIO
interrupt and then response 4 bytes data.

There was an error if we do not use kfifo:
	With heavy loading by finger report / read command, the driver may
get finger report as response data.

So, do you understand my meaning? 

> - please remove the rest of the custom threads
OK

> - you do not need to call input_mt_destroy_slots() explicitly
OK
> - use request_firmware() instead of special character device to upload
>   firmware.
OK, but I'll remove firmware update function at this patch first.

> - please use standard kernel-doc markup.
> - consider what attributes are there only for debugging and move them to
>   debugfs.
OK.

> - I find the use of enums in this driver quite unconventional, just
>   standard #defines would probably be more straightforward.
OK.

Thanks,
Scott

> 
> Thanks.
> 
> --
> Dmitry

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