linux-kernel - Re: [RESEND PATCHv5 09/11] modem_shm: Character device for SHM channel access.

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Message-ID: <CAJK669YEbAq7xue9rAK9ikiUNm_ZVQZ4CaPhSr22xU56a_2B0g@mail.gmail.com>
Date:	Thu, 2 Aug 2012 14:11:05 +0200
From:	Sjur Brændeland <sjurbren@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: Re: [RESEND PATCHv5 09/11] modem_shm: Character device for SHM
 channel access.

>On Thu, Aug 2, 2012 at 12:25 PM,
>Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> Add a character device implementation for the SHM stream channels.
>> The character device provides asynchronous IO and ring-buffer handling.
>> The device copies data directly from the Shared Memory area into
>> user-land buffers.
>
> What is the use case for this - it seems a little odd that it's not using
> the tty layer so won't work with all the normal modem apps as anyone
> would expect and want ?

Hi Alan,

Thank you for reviewing this patch.

I am working on a re-spin of the entire patch-set for Modem-SHM using
the RemoteProc framework from Ohad Ben Cohen and using Virtio as
transport mechanism between modem and host. I hope to be able to
use Virtio Console for the tty.The use-case tty/char device is for
transfering boot images to the modem and fetch crash logs.

For normal operation of the modem the CAIF protocol is used. I'm writing
on a new CAIF-Virtio driver for this that works with the RemoteProc
framework.

Regards,
Sjur
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