linux-kernel - Re: [PATCH 1/2] USB: serial: cp210x: Implement 16-bit register access functions

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Date:	Tue, 20 Oct 2015 07:52:31 -0500
From:	Konstantin Shkolnyy <konstantin.shkolnyy@...il.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] USB: serial: cp210x: Implement 16-bit register access functions

On Tue, Oct 20, 2015 at 2:45 AM, Johan Hovold <johan@...nel.org> wrote:
[...]
> Instead of adding the new helpers to read u16 as a prerequisite for
> fixing the broken cp2108 support, just reuse the current config register
> helpers for now (in order to keep the fixes minimal and potentially
> backportable). Once the fixes are in place, feel free to clean up the
> remaining register accesses.

The current helpers take "port" as a parameter. You pointed out
previously that port shouldn't be used in probe(). That made me
implement new helpers cp210x_write_u16_reg and cp210x_read_u16_reg
that don't use port. Probe() now calls cp210x_activate_workarounds
which in turn calls these new helpers.

An alternative would be to call usb_control_msg from
cp210x_activate_workarounds, but I think it would make it look pretty
ugly.
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