linux-kernel - Re: [PATCH 2/2] Input: matrix_keymap

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Message-ID: <4F9EB72A.10403@wwwdotorg.org>
Date:	Mon, 30 Apr 2012 10:00:42 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	linux-input@...r.kernel.org, Viresh Kumar <viresh.kumar@...com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Rakesh Iyer <riyer@...dia.com>
Subject: Re: [PATCH 2/2] Input: matrix_keymap - wire up device tree support

On 04/29/2012 10:19 PM, Dmitry Torokhov wrote:
> On Thu, Apr 26, 2012 at 09:05:18AM -0600, Stephen Warren wrote:
>> On 04/26/2012 02:19 AM, Dmitry Torokhov wrote:
>>> When platform keymap is not supplied to matrix_keypad_build_keymap()
>>> and device tree support is enabled, try locating specified property
>>> and load keymap from it. If property name is not defined, try using
>>> "linux,keymap".
>>>
>>> Based on earlier patch by Viresh Kumar <viresh.kumar@...com>
>>
>> I think this series looks mostly OK. A few comments below.
>>
>> We don't actually have the KBC driver hooked up on any boards yet, so I
>> can't actually test this yet.
>>
>> How will the linux,fn-keymap handling work? It looks like this code is
>> allocating a keymap data structure with one additional row to represent
>> fn-not-pressed vs. fn-pressed.
> 
> No, it loads 2x rows (therefore giving you twice original keymap size).

Yes, I mean an extra row signal, so therefore twice as many rows.

>> I assume this will work without issue
>> even though the second half is not filled in. Won't this allow the
>> linux,keymap property entries to pass validation "if (row >= rows)" for
>> one more row than it should?
> 
> Maybe... I think we should revisit this when you actually have
> linux,fn-keymap. Probably will need to export matrix_keypad_parse_

Would it be better to just drop the support for the linux,fn-keymap
property, until the full support is there? That wouldn't lose any
functionality, but would avoid this potential error-checking issue.
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