linux-kernel - Re: [PATCH 2/3] Add rfkill support to compal-laptop

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Date:	Tue, 18 Aug 2009 22:08:14 +0100
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	Mario Limonciello <mario_limonciello@...l.com>
Cc:	"johannes@...solutions.net" <johannes@...solutions.net>,
	Marcel Holtmann <marcel@...tmann.org>,
	cezary.jackiewicz@...il.com, linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH 2/3] Add rfkill support to compal-laptop

On 8/18/09, Mario Limonciello <mario_limonciello@...l.com> wrote:
> Hi Alan & Marcel:
>
> Alan Jenkins wrote:
>> Also, you're missing the calls to rfkill_destroy() here.
>>
>> Whew, I think that's everything.  I hope you find the feedback useful,
>> despite it being a little fragmented.
>>
>>
> Thanks for all the feedback.  I think i've addressed all of the concerns
> that were pointed out.  I appreciate the pointer to scripts/cleanpatch,
> that does significantly help in finding whitespace problems that the
> naked eye just browses over.
>
> I'm attaching the updated patch (sorry, git send-email seems to still
> not be very graceful with line breaks when the SMTP implementation is
> exchange from what i've seen)

> +static void compal_rfkill_poll(struct rfkill *rfkill, void *data)
> +{
> +	unsigned long radio = (unsigned long) data;
> +	u8 result;
> +	bool hw_blocked;
> +	bool sw_blocked;
> +
> +	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
> +
> +	hw_blocked = !(result & KILLSWITCH_MASK);
> +	sw_blocked = (!hw_blocked && !(result & radio));
> +
> +	rfkill_set_states(rfkill, sw_blocked, hw_blocked);
> +}

I assume you have good reason for having sw_block depend on hw_block.
I.e. you can't read sw_blocked while hw_blocked is set, right?

If KILLSWITCH is toggled on and off, will the hardware "forget" any
prior soft-blocks?

It would also be nice to know if hardware/firmware ever changes
sw_blocked, e.g. in response to a button press.

Johannes, I think I'm confusing myself here.  Can you have a look at
this code?  I remember the rfkill rewrite was designed to help with
something like this, but I don't know how exactly.

Thanks
Alan
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