linux-kernel - Re: New IDX in linux/connector.h ?

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Message-ID: <20080723140450.GA30991@2ka.mipt.ru>
Date:	Wed, 23 Jul 2008 18:04:50 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Jerome Arbez-Gindre <jeromearbezgindre@...il.com>
Cc:	linux-kernel@...r.kernel.org, deweerdt@...e.fr
Subject: Re: New IDX in linux/connector.h ?

On Wed, Jul 23, 2008 at 03:45:09PM +0200, Jerome Arbez-Gindre (jeromearbezgindre@...il.com) wrote:
>  diff --git a/include/linux/connector.h b/include/linux/connector.h
> index 96a89d3..361996c 100644
> --- a/include/linux/connector.h
> +++ b/include/linux/connector.h
> @@ -38,6 +38,7 @@
>  #define CN_W1_VAL			0x1
>  #define CN_IDX_V86D			0x4
>  #define CN_VAL_V86D_UVESAFB		0x1
> +#define CN_IDX_BB			0x5
> 
>  #define CN_NETLINK_USERS		5

Update this number too.
While it is less than 32, it does not matter, but just for the record.

> > I even wanted to have private indexes, i.e. those which are supposed to
> > be used by out-of-the-tree code, and no in-kernel users would ever touch
> > this numbers.
> 
> So which numbers am I suppose to use ... taking account that BB will
> probably stay for a long time out-of-the-tree ?

You can use whatever VAL number you like:

struct cb_id cn_dst_id[] = {{CN_DST_IDX, 1}, {CN_DST_IDX, 2}, {CN_DST_IDX, 3}};

for (i=0; i<ARRAY_SIZE(cn_dst_id); ++i)
  cn_add_callback(&cn_dst_id[i], "DST", cn_dst_callback_func);

So cn_dst_callback_func() will be invoked for
idx=CN_DST_IDX,val={1,2,3}, you can determine val parameter from the
provided header and make appropriate decition.
You can also register multiple different callbacks for each idx.val
pair of course.

-- 
	Evgeniy Polyakov
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