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Date: Wed, 3 Mar 2010 14:07:19 +0100
Message-ID: <63386a3d1003030507l25e32ec2u92610cf40a91e538@mail.gmail.com>
Subject: Re: [GIT PULL] Ambient Light Sensors subsystem
From: Linus Walleij <linus.ml.walleij@gmail.com>
To: Dima Zavin <dmitriyz@google.com>
Cc: Jean Delvare <khali@linux-fr.org>, Jonathan Cameron <jic23@cam.ac.uk>,
       torvalds@linux-foundation.org, LKML <linux-kernel@vger.kernel.org>,
       Zhang Rui <rui.zhang@intel.com>,
       Amit Kucheria <amit.kucheria@verdurent.com>
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2010/3/3 Dima Zavin <dmitriyz@google.com>:

> there are plenty of
> drivers floating out there from many OEMs/vendors

Bad for them that they didn't work on integrating these to the
mainline kernel and creating proper subsystems for them
earlier.

> that are not ALSs,
> but essentially need a similar interface (e.g. proximity sensor).

I have a proximity sensor driver pending here on top of GPIO,
creating an input-on-top-of-GPIO driver framework. Too much
to do but here is the userspace interface:

diff --git a/include/linux/input.h b/include/linux/input.h
index a5802c9..cbe8a98 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -644,6 +644,7 @@ struct input_absinfo {
 #define SW_RADIO		SW_RFKILL_ALL	/* deprecated */
 #define SW_MICROPHONE_INSERT	0x04  /* set = inserted */
 #define SW_DOCK			0x05  /* set = plugged into dock */
+#define SW_PROXIMITY		0x06  /* set = prox. sensor detects object */
 #define SW_MAX			0x0f
 #define SW_CNT			(SW_MAX+1)

-- 

Comes in through /dev/input/event* something, simple.

I have heard about proximity sensors returning more than a binary
value, do you have one of those?

Yours,
Linus Walleij