linux-kernel - Re: Writing a console/tty driver -- how to use tty

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Date:	Thu, 28 Oct 2010 14:35:16 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	gregkh <gregkh@...e.de>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: Writing a console/tty driver -- how to use tty_port?

Alan Cox wrote:
> drivers/mmc/card/sdio_uart.c
> 
> is in some ways the best example, it handles all the horrible cases
> including unloading of hardware v open races, its way more than you'd
> need but does illustrate it all.

Thanks Alan.  As always, you're a great help.

I've made some progress adding support for tty_port.  I'm registering the ISR in
the tty_port .activate function.

I see something weird, though.  I lose the console after I log in:

p4080 login: root
Password:
ehv_bc_tty_open:442 ttys=dce50000 stdout_irq=68
ehv_bc_tty_close:450 tty=dce50000
ls

logout
ehv_bc_tty_close:450 tty=dce50000
ehv_bc_console_device:390
ehv_bc_tty_open:442 ttys=dce50000 stdout_irq=68

p4080 login:

The "ehv_bc_..." lines are my debug printks.

When I type "ls", I don't get a listing.  The "logout" occurs after I press ^D.

-- 
Timur Tabi
Linux kernel developer at Freescale

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