linux-kernel - Re: [PATCH] lm90: Support the MAX6648/6692 chips

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Date:	Thu, 5 Mar 2009 15:25:17 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [PATCH] lm90: Support the MAX6648/6692 chips

Hi Darrick

On Mon, 2 Mar 2009 13:01:06 -0800, Darrick J. Wong wrote:
> The max6648 chip has nearly the same register set as the 6657 and
> seems to have a working manufacturer/chip id so we can detect it.
> This patch adds support for it.  Tested on a Nvidia Quadro FX 1500
> card.
> 
> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> ---
> 
>  drivers/hwmon/Kconfig |    4 ++--
>  drivers/hwmon/lm90.c  |    7 ++++++-
>  2 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 8c312c6..7da49d3 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -550,8 +550,8 @@ config SENSORS_LM90
>  	help
>  	  If you say yes here you get support for National Semiconductor LM90,
>  	  LM86, LM89 and LM99, Analog Devices ADM1032 and ADT7461, and Maxim
> -	  MAX6646, MAX6647, MAX6649, MAX6657, MAX6658, MAX6659, MAX6680 and
> -	  MAX6681 sensor chips.
> +	  MAX6646, MAX6647, MAX6649, MAX6657, MAX6658, MAX6659, MAX6680,
> +	  MAX6648, MAX6692 and MAX6681 sensor chips.
>  
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called lm90.
> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> index 96a7018..1802366 100644
> --- a/drivers/hwmon/lm90.c
> +++ b/drivers/hwmon/lm90.c
> @@ -776,7 +776,12 @@ static int lm90_detect(struct i2c_client *new_client, int kind,
>  			 && (reg_config1 & 0x3f) == 0x00
>  			 && reg_convrate <= 0x07) {
>  				kind = max6646;
> -			}
> +			} else
> +			/* The MAX6648/6692 chips have a working man/chip id
> +			 * and the same register set as the 6657.
> +			 */
> +			if (chip_id == 0x59 && address == 0x4C)
> +				kind = max6657;
>  		}
>  
>  		if (kind <= 0) { /* identification failed */

I am confused. According to my notes, the MAX6648/MAX6692 is the same
chip as the MAX6646/MAX6647/MAX6649 (same chip ID of 0x59), the only
difference being the I2C address (0x4c for the MAX6646, 0x4e for the
MAX6647 and 0x4d for the MAX6648/MAX6649/MAX6692). So the current code
should _already_ detect your MAX6648 or MAX6692 as kind = max6646.

Can you please test the latest version of the sensors-detect script [1]
and let me know if your chip is properly detected? If not, please
provide a dump of your chip.

[1] http://www.lm-sensors.org/svn/lm-sensors/trunk/prog/detect/sensors-detect

-- 
Jean Delvare
--
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