linux-kernel - Re: [PATCH] hwmon: Consider LM64 temperature offset

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Date:	Tue, 8 Feb 2011 08:07:36 -0800
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	"Eibach, Dirk" <Eibach@...ys.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [PATCH] hwmon: Consider LM64 temperature offset

On Tue, Feb 08, 2011 at 10:54:52AM -0500, Eibach, Dirk wrote:
> 
> Dear Guenter, 
> 
> > Chip id is already detected in lm63_detect. You don't need to 
> > detect it again.
> > The more common approach would be something along the line of
> > 	data->kind = id->driver_data;
> >     You would then use
> > 	if (data->kind == lm64)
> >     throughout the code. In addition to that, you could define
> > 	data->kind = id->driver_data;
> > 	if (data->kind == lm64)
> > 		data->offset = 16000;
> >     which would save you the repeated recalculation of offset 
> > as mentioned before.
> 
> I don't understand, what structures "data" and "id" you are referring to
> here and where the fields driver_data and kind come from. I remember to
> have seen such in older kernels, but wasn't that replaced sometime ago?
> 

static int lm63_probe(struct i2c_client *new_client,
                      const struct i2c_device_id *id)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
{
	struct lm63_data *data;
	^^^^^^^^^^^^^^^^^^^^^^
	...
	/* Set the device type */
        data->kind = id->driver_data;

with

struct lm63_data {
	...
	int kind;	// instead of is_lm64
	...
};

id is from 

static const struct i2c_device_id lm63_id[] = {
        { "lm63", lm63 },
        { "lm64", lm64 },
        { }
};

id->driver_data is thus either lm63 or lm64, depending on the chip type
detected in lm63_detect().

Thanks,
Guenter 

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