linux-kernel - Re: [PATCH 2/4] Input: mt-matrix-keypad: Add Bosch mt matrix keypad driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 5 May 2022 10:27:43 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marco Felsch <m.felsch@...gutronix.de>,
        Gireesh.Hiremath@...bosch.com
Cc:     linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        bcousson@...libre.com, tony@...mide.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dmitry.torokhov@...il.com,
        mkorpershoek@...libre.com, davidgow@...gle.com,
        swboyd@...omium.org, fengping.yu@...iatek.com,
        y.oudjana@...tonmail.com, rdunlap@...radead.org,
        colin.king@...el.com, sjoerd.simons@...labora.co.uk,
        VinayKumar.Shettar@...bosch.com,
        Govindaraji.Sivanantham@...bosch.com, anaclaudia.dias@...bosch.com
Subject: Re: [PATCH 2/4] Input: mt-matrix-keypad: Add Bosch mt matrix keypad
 driver

On 04/05/2022 16:14, Marco Felsch wrote:
> On 22-05-04, Gireesh.Hiremath@...bosch.com wrote:
>> From: Gireesh Hiremath <Gireesh.Hiremath@...bosch.com>
>>
>> The existing matric_keypad.c use different gpio line for row and colunm,
>> where in mt_matrix_kepad.c use same gpio line for row as well as column.
>> a key can be placed at each intersection of a unique row number 
>> not equal to a unique column and they are diagonally symmetric.
>> Advantage of this is with existed gpio line we can get more keys
>>   
>> example: in matrix_keypad.c for 5 gpio line possible matrix is 2X3 or 3X2
>> and maximum possible keys are 6 but 
>> in mt_matrix_kepad.c for same 5 gpio line possible matrix is 5X5 and maximum
>> possible buttons are 10, below table will discribe that
> 
> Nobody should stop you to increase the amount of max. possible keys, so
> this isn't a real block.
> 
>> 	------------------------------------------------------
>> 	|Row\Col |GPIO 0 | GPIO 1 | GPIO 2 | GPIO 3 | GPIO 4 |
>> 	------------------------------------------------------
>> 	| GPIO 0 |  X    | KEY_9  | KEY_2  | KEY_3  | KEY_1  |
>> 	------------------------------------------------------
>> 	| GPIO 1 | KEY_9 |  X     | KEY_6  | KEY_5  |  KEY_0 |
>> 	------------------------------------------------------
>> 	| GPIO 2 | KEY_2 | KEY_6  |  X     | KEY_4  | KEY_7  |
>> 	------------------------------------------------------
>> 	| GPIO 3 | KEY_3 | KEY_5  | KEY_4  |  X     | KEY_8  |
>> 	------------------------------------------------------
>> 	| GPIO 4 | KEY_1 |  KEY_0 | KEY_7  | KEY_8  |  X     |
>> 	------------------------------------------------------
>> 	X - invalid key
>> 	KEY_x - preferred key code
> 
> That should be pointed somewhere very clearly, thanks for the
> description. Also what is than the benefit of the original matrix_keypad
> driver?

It looks like this driver has smaller number of features than
matrix-keypad, so it should be integrated into the matrix-keypad.
matrix-keypad features are superset to this one.

Best regards,
Krzysztof