linux-kernel - Re: scx200_i2c driver fails to detect any i2c devices in 2.6.26

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Message-ID: <20081023192056.49656653@hyperion.delvare>
Date:	Thu, 23 Oct 2008 19:20:56 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	linux-kernel@...r.kernel.org, ben-linux@...ff.org,
	Len Sorensen <lsorense@...lub.uwaterloo.ca>
Subject: Re: scx200_i2c driver fails to detect any i2c devices in 2.6.26

Hi Lennart,

On Thu, 23 Oct 2008 12:54:19 -0400, Lennart Sorensen wrote:
> In 2.6.18, the scx200_i2c driver was working just fine.  Now while
> moving to 2.6.26 I find that the bus no longer locates any devices when
> drivers are loaded, even though i2cdetect has no problem locating
> devices on the bus.
> 
> After some searching, I discovered that the scx200_i2c driver doesn't
> have a .class parameter filled in, even though every other i2c driver
> does.  A small patch adding the .class parameter fixes the problem.

Correct. Not sure how we missed this for years.

> Not sure if it should be I2C_CLASS_ALL or I2C_CLASS_HWMON, or even
> I2C_CLASS_HWMON | I2C_CLASS_SPD (in current git tree).  Using
> I2C_CLASS_ALL works for me and works with my lm75, m41t81 and spd
> eeprom in 2.6.26.

I2C_CLASS_HWMON | I2C_CLASS_SPD please. I2C_CLASS_ALL is almost never
what people want, and actually I'm thinking of removing it to prevent
developers from getting it wrong.

> 
> --- a/drivers/i2c/busses/scx200_i2c.c	2008-07-13 17:51:29.000000000 -0400
> +++ b/drivers/i2c/busses/scx200_i2c.c	2008-10-23 12:41:02.000000000 -0400
> @@ -81,6 +81,7 @@
>  
>  static struct i2c_adapter scx200_i2c_ops = {
>  	.owner		   = THIS_MODULE,
> +	.class             = I2C_CLASS_ALL,
>  	.id		   = I2C_HW_B_SCX200,
>  	.algo_data	   = &scx200_i2c_data,
>  	.name	= "NatSemi SCx200 I2C",
> 


-- 
Jean Delvare
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