linux-kernel - Re: [PATCH] i2c: i801: add lis3lv02d's I2C address for Vostro 5568

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Message-ID: <20221019203403.GA149239@nam-dell>
Date:   Wed, 19 Oct 2022 22:34:03 +0200
From:   Nam Cao <namcaov@...il.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     Jean Delvare <jdelvare@...e.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: i801: add lis3lv02d's I2C address for Vostro 5568

On Tue, Oct 18, 2022 at 08:00:51PM +0200, Pali Rohár wrote:
> On Tuesday 18 October 2022 19:39:51 Jean Delvare wrote:
> > On Thu, 06 Oct 2022 16:54:40 +0200, Nam Cao wrote:
> > > Dell Vostro 5568 laptop has lis3lv02d, but its i2c address is not known
> > > to the kernel. Add this address.
> > > 
> > > Output of "cat /sys/devices/platform/lis3lv02d/position" on Dell Vostro
> > > 5568 laptop:
> > >     - Horizontal: (-18,0,1044)
> > >     - Front elevated: (522,-18,1080)
> > >     - Left elevated: (-18,-360,1080)
> > >     - Upside down: (36,108,-1134)
> > > 
> > > Signed-off-by: Nam Cao <namcaov@...il.com>
> > > ---
> > >  drivers/i2c/busses/i2c-i801.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
> > > index a176296f4fff..e46561e095c6 100644
> > > --- a/drivers/i2c/busses/i2c-i801.c
> > > +++ b/drivers/i2c/busses/i2c-i801.c
> > > @@ -1243,6 +1243,7 @@ static const struct {
> > >  	 */
> > >  	{ "Latitude 5480",      0x29 },
> > >  	{ "Vostro V131",        0x1d },
> > > +	{ "Vostro 5568",        0x29 },
> > >  };
> > >  
> > >  static void register_dell_lis3lv02d_i2c_device(struct i801_priv *priv)
> > 
> > Fine with me.
> > 
> > Reviewed-by: Jean Delvare <jdelvare@...e.de>
> > 
> > Pali, OK with you?
> 
> Yes, nice to see that other people discovered another hidden hardware
> devices in their own laptops :-)
> 
> Reviewed-by: Pali Rohár <pali@...nel.org>
> 
> 
> Nam Cao, could you check your ACPI DSDT table if there is not specified
> this smbus/i2c address 0x29? Autodiscovery would be better than
> hardcoding. At least for E6440 I was told that BIOS does not provide it.

My reply got rejected by mailing list because the attachment was too big.
So I re-send this without the attachment, so that everyone can see.

I searched the DSDT table for "29", but none of them looks like an i2c
address.

But this is the first time I hear about ACPI DSDT table, so I may did
something incorrectly. I did:
        - cp /sys/firmware/acpi/tables/DSDT table
        - iasl -d table
        - Search through table.dsl

Best regards,
Nam