Re: smartbattery support

[Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Fri, Oct 08, 2004 at 08:36:09PM +0100, Pedro Venda wrote:
> Li, Shaohua wrote:
> >>On Thu, Oct 07, 2004 at 09:43:20PM +0800, Li, Shaohua wrote:
> >>
> >>>You needed an EC-based SMBus host driver (IIRC, some Acer latops
> >
> >defined
> >
> >>>such host in DSDT). ACPI spec has the definition for EC-based SMBus
> >
> >host
> >
> >>>interface. Second, a sensor driver for reading smart battery
> >
> >information
> >
> >>>is required.
> >>>
> >>
> >>Some times ago, for a toshiba laptop, I began an i2c-acpi-ec driver:
> >>ftp://ftp.poupinou.org/acpi/i2c-acpi-ec.c
> >>
> >>It's a little bit buggy though but this allowed for me to access the
> >>sensors
> >>behind the EC.  The main trouble was that there were not actually a
> >>smbus declared in the ACPI namespace and it was needed to hardcode
> >
> >where
> >
> >>is the base adress in the EC space.
> >>You may try to start with that maybe, and I guess a real
> >
> >acpi_ec_smb_probe
> >
> >>function must be written.
> >
> >Some Acer laptops define the SMBus host as below:
> >  		Device (SMBC)
> >                    {
> >                        Name (_HID, "ACPI0001")
> >                        Name (_EC, 0x1820)
> >                        Device (SBS0)
> >                        {
> >                            Name (_HID, "ACPI0002")
> >                            Name (_SBS, 0x02)
> >                        }
> >                    }
> >The base address and the notification number are defined on the _EC
> >method.
> >Please check if you system has such definition.
> 
> my acer travelmate 4001WLmi looks like this:
> 
> Device (SMBC)
>                     {
>                         Name (_HID, "ACPI0001")
>                         Name (_EC, 0x1820)
>                         Device (SBS0)
>                         {
>                             Name (_HID, "ACPI0002")
>                             Name (_SBS, 0x02)
>                         }
>                     }
> 

This mean that you have a SMB-HC with adress 0x18 and query 0x20.
You may try i2c-acpi-ec, but you have to change:
#define SMBUS_ADDRESS_TO_HAVE 0x60
to 
#define SMBUS_ADDRESS_TO_HAVE 0x18
Also, you need to get at least i2c-core in your kernel for this to work.

Note that this code have 2 years... and if there is more than one EC in
your system, this may not work.  In that case, could you please send me
a dump of the acpi tables?
btw, there is two batteries, because 'Name (_SBS, 0x02)'.

Cheers,

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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