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From: Vojtech Pavlik <vojtech@suse.cz>
To: Alejandro Bonilla <abonilla@linuxwireless.org>
Cc: Pavel Machek <pavel@suse.cz>,
	Paul Sladen <thinkpad@paul.sladen.org>,
	linux-thinkpad@linux-thinkpad.org,
	Eric Piel <Eric.Piel@tremplin-utc.net>,
	borislav@users.sourceforge.net,
	"'Yani Ioannou'" <yani.ioannou@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [ltp] IBM HDAPS Someone interested? (Accelerometer)
Date: Sat, 25 Jun 2005 22:14:42 +0200	[thread overview]
Message-ID: <20050625201442.GB1591@ucw.cz> (raw)
In-Reply-To: <42BD9F1E.5090407@linuxwireless.org>

On Sat, Jun 25, 2005 at 01:14:54PM -0500, Alejandro Bonilla wrote:
> >>I think you got it... 2ports seem like enough for some kind of small
> >>u-controller...
> >>   
> >>
> >
> >Quite possibly the ACPI EC. Most likely a side entrance into the onboard 
> >8042.
> >
> > 
> >
> Vojtech,
> 
>    What is the onboads 8042?

Every PC has a small microprocessor on the mainboard, descended from the
ancient Intel i8042. It is primarily intended to take care of the
keyboard and mouse, but in notebooks the input functionality is
overshadowed by other uses.

Those often include: Battery monitoring and communication, display
backlight control, power on/off, and similar stuff.

It is usually accessible through ACPI, and ACPI calls it the EC -
embedded controller. ACPI doesn't mandate the EC to be the 8042, they
could be separate, but for cost reasons, they usually are the same chip.

Since the 8042 is the chip where you attach stuff that no other chip
wants, it's probably the primary choice for connecting the ADXL output.

A small problem is that the 8042 normally doesn't have any ADCs,
however, I assume most of the 8042 implementations in modern notebooks
do have at least a few ADCs, for battery monitoring, etc.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR

  reply	other threads:[~2005-06-25 20:14 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <42B6F6F6.2040704@zipman.it>
2005-06-20 17:28 ` [ltp] Re: IBM HDAPS Someone interested? Alejandro Bonilla
2005-06-20 19:51   ` Yani Ioannou
2005-06-20 20:11     ` Yani Ioannou
2005-06-20 20:25       ` Alejandro Bonilla
2005-06-20 20:34         ` Yani Ioannou
2005-06-20 20:48           ` Alejandro Bonilla
2005-06-20 21:35             ` Lee Revell
2005-06-20 21:57               ` Alejandro Bonilla
2005-06-20 23:35                 ` Lee Revell
2005-06-22 10:49                   ` Pavel Machek
2005-06-22 12:50                     ` Alejandro Bonilla
2005-06-23  7:13                       ` Vojtech Pavlik
2005-06-23 10:06                         ` Eric Piel
2005-06-23 12:53                           ` Alejandro Bonilla
2005-06-23 13:18                             ` Vojtech Pavlik
2005-06-23 20:22                             ` Eric Piel
2005-06-23 20:42                               ` Lee Revell
2005-06-25  6:17                                 ` [ltp] IBM HDAPS Someone interested? (Accelerometer) Paul Sladen
2005-06-25 11:31                                   ` Vojtech Pavlik
2005-06-25 14:47                                   ` Pavel Machek
2005-06-25 15:00                                     ` Vojtech Pavlik
2005-06-25 18:14                                       ` Alejandro Bonilla
2005-06-25 20:14                                         ` Vojtech Pavlik [this message]
2005-06-27 12:33                                           ` Lenz Grimmer
2005-06-27 13:10                                             ` Alejandro Bonilla
2005-06-27 21:02                                               ` Lee Revell
2005-06-28  3:22                                                 ` Alejandro Bonilla
2005-06-28  5:40                                                   ` Lee Revell
2005-06-28 15:40                                             ` Vojtech Pavlik
2005-06-25 18:13                                     ` Alejandro Bonilla
2005-06-25 20:09                                       ` Vojtech Pavlik
2005-06-25 22:41                                         ` Alejandro Bonilla
2005-06-27  3:35                                         ` [Hdaps-devel] " Shawn Starr
2005-07-03  8:37                                         ` Alejandro Bonilla
2005-07-03 10:16                                           ` Vojtech Pavlik
2005-07-03 11:07                                             ` Jesper Juhl
2005-07-03 18:17                                               ` Jesper Juhl
2005-07-03 19:21                                                 ` [Hdaps-devel] " Dave Hansen
2005-07-03 18:29                                                   ` Alejandro Bonilla
2005-07-03 19:37                                                     ` Dave Hansen
2005-07-03 19:42                                                   ` Jesper Juhl
2005-07-03 18:52                                                     ` Alejandro Bonilla
2005-07-03 19:42                                                     ` Henrik Brix Andersen
2005-07-03 20:03                                                       ` Jesper Juhl
2005-07-03 20:53                                                   ` Tomasz Torcz
2005-07-03 19:41                                                 ` Dave Hansen
2005-07-11  9:42                                           ` [ltp] IBM HDAPS Someone interested? (Userspace accelerometer viewer) Paul Sladen
2005-07-11 14:26                                             ` Alan Cox
2005-07-11 16:53                                               ` [Hdaps-devel] " Dave Hansen
2005-07-11 17:31                                               ` Paul RIVIER
2005-07-11 20:09                                               ` [Hdaps-devel] " Daniel Willmann
2005-07-12 15:55                                                 ` Dave Hansen
2005-07-11 15:13                                             ` Pavel Machek
2005-07-12  9:41                                               ` Matthew Garrett
2005-07-11 16:21                                             ` [Hdaps-devel] " Dave Hansen
2005-07-13 16:27                                             ` Alejandro Bonilla
2005-06-25 17:42                                   ` [ltp] IBM HDAPS Someone interested? (Accelerometer) Alejandro Bonilla
2005-06-27 10:36                                     ` P
2005-06-23 15:33                   ` [ltp] Re: IBM HDAPS Someone interested? Jan Knutar
2005-06-23 17:08                     ` Lee Revell
2005-06-23 20:47                       ` Andrew Haninger
2005-06-24  9:16                       ` P
2005-06-24 12:56                       ` Alejandro Bonilla
2005-06-24 17:20                       ` Alejandro Bonilla
2005-06-20 20:53         ` Vojtech Pavlik
     [not found] ` <005b01c575bd_724fac60_600cc60a@amer.sykes.com>
2005-06-20 20:25   ` Pavel Machek

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