From: Greg KH <gregkh@linuxfoundation.org>
To: Ryan Lovelett <ryan@lovelett.me>
Cc: linux-serial@vger.kernel.org
Subject: Re: FT232H user space GPIO device
Date: Mon, 23 Mar 2020 07:52:11 +0100 [thread overview]
Message-ID: <20200323065211.GD129571@kroah.com> (raw)
In-Reply-To: <6267385dcb44b73f3b5b38070da602bbdb56d545.camel@lovelett.me>
On Sun, Mar 22, 2020 at 03:40:33PM -0400, Ryan Lovelett wrote:
> I have been trying to find a way to get my Adafruit FT232H breakout
> board [1] to appear as a user space GPIO device so I can use it with
> libgpiod. As far as I can tell from reading table 3.5 from the
> datasheet [2] ACBUS5, ACBUS6, ACBUS8 and ACBUS9 should all be usable
> for this.
>
> I found a patch that was submitted by Karoly Pados in 2018 [3] that
> seemes to add support for that (though maybe only for a specific chip).
>
> Through a little bit of ftrace and printk I realized that the switch
> statement in ftdi_gpio_init was falling through to the default case for
> the FT232H [4].
So it sounds like you have the wrong device type. Can you make sure you
use the latest kernel release (5.5) and if you have problems with this,
email the linux-usb mailing list as the driver maintainers for that
driver are there.
thanks,
greg k-h
next prev parent reply other threads:[~2020-03-23 6:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-22 19:40 FT232H user space GPIO device Ryan Lovelett
2020-03-23 6:52 ` Greg KH [this message]
2020-03-23 13:00 ` Ryan Lovelett
2020-03-24 9:28 ` Johan Hovold
2020-03-24 12:38 ` Ryan Lovelett
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