linux-kernel - Re: Query related to MSR(Magnetic Stripe Reader) Device Driver

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Message-ID: <CAMNxYszZNTh69-y+5RFVC9c5kgcyPaVET7784OPsTarB0fWm5w@mail.gmail.com>
Date:	Thu, 31 Jan 2013 11:09:24 +0530
From:	Priyaranjan Das <priyaranjan456789@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, mankad.maulik@...il.com
Subject: Re: Query related to MSR(Magnetic Stripe Reader) Device Driver

Hi Greg,

On Tue, Jan 29, 2013 at 7:03 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Mon, Jan 28, 2013 at 03:25:08PM +0530, Priyaranjan Das wrote:
>> Hi Greg,
>>
>> On Tue, Jan 22, 2013 at 10:06 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
>> > On Tue, Jan 22, 2013 at 03:02:32PM +0530, Priyaranjan Das wrote:
>> >> Hi All,
>> >>
>> >> I am working on MSR(Magnetic Stripe Reader) for a product . I wish to
>> >> know whether any MSR( Magnetic Stripe/card Reader) driver is available
>> >> in the current source or not. I need this for reference. Could anyone
>> >> please help me?
>> >
>> > Most of these types of devices that I have worked with always show up as
>> > a keyboard device (ps/2 pass-through or a USB hid device.)  What type of
>> > interface does your device present to the operating system?
>> >
>>
>> The MSR will be a part of a SoC. It is  a memory mapped device hence
>> there is no interface like USB.
>
> Ok, that's different.  But how will your driver want to communicate the
> reader data to userspace?  That will probably determine where you want
> to put it.
>
> I would recommend making it an input device and sending keystrokes that
> you read from the card, so you can properly integrate into userspace
> applications that are used to using a card reader.
>
>> MSR IP contains an ADC which the driver will read and interpret the
>> data. I am planning to write a Driver for the same. Will this driver
>> fall under drivers/mfd/* ?
>
> As per the above, I would think drivers/input/ wouldn't you?
>
> Hope this helps,
>

Thanks for your help!.

Yes, you are right, it should be under drivers/input.
I am trying to prepare the design right now.


Regards,
Priyaranjan
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