Date:	Thu, 7 Apr 2011 18:38:09 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	Andrew Chew <achew@...dia.com>, <lm-sensors@...sensors.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] hwmon: (lm90) Add support for ADT7461A and NCT1008

On Thu, 7 Apr 2011 07:57:14 -0700, Guenter Roeck wrote:
> This patch adds support for ADT7461A and NCT1008 to the lm90 driver.
> Both chips have identical functionality and report the same manufacturing ID
> and device ID values.
> 
> Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
> ---
> v2:
> - Updated documentation
> - Added device ID for nct1008
> 
>  Documentation/hwmon/lm90 |   22 ++++++++++++++++------
>  drivers/hwmon/Kconfig    |    8 ++++----
>  drivers/hwmon/lm90.c     |   22 +++++++++++++++-------
>  3 files changed, 35 insertions(+), 17 deletions(-)
> 
> diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
> index fa475c0..ed58f17 100644
> --- a/Documentation/hwmon/lm90
> +++ b/Documentation/hwmon/lm90
> @@ -32,6 +32,16 @@ Supported chips:
>      Addresses scanned: I2C 0x4c and 0x4d
>      Datasheet: Publicly available at the ON Semiconductor website
>                 http://www.onsemi.com/PowerSolutions/product.do?id=ADT7461
> +  * Analog Devices ADT7461A
> +    Prefix: 'adt7461a'
> +    Addresses scanned: I2C 0x4c and 0x4d
> +    Datasheet: Publicly available at the ON Semiconductor website
> +               http://www.onsemi.com/PowerSolutions/product.do?id=ADT7461A
> +  * ON Semiconductor NCT1008
> +    Prefix: 'nct1008'
> +    Addresses scanned: I2C 0x4c and 0x4d
> +    Datasheet: Publicly available at the ON Semiconductor website
> +               http://www.onsemi.com/PowerSolutions/product.do?id=NCT1008
>    * Maxim MAX6646
>      Prefix: 'max6646'
>      Addresses scanned: I2C 0x4d
> @@ -149,7 +159,7 @@ ADM1032:
>    * ALERT is triggered by open remote sensor.
>    * SMBus PEC support for Write Byte and Receive Byte transactions.
>  
> -ADT7461:
> +ADT7461, ADT7461A, NCT1008:
>    * Extended temperature range (breaks compatibility)
>    * Lower resolution for remote temperature
>  
> @@ -205,11 +215,11 @@ SMBus Alert Support
>  This driver has basic support for SMBus alert. When an alert is received,
>  the status register is read and the faulty temperature channel is logged.
>  
> -The Analog Devices chips (ADM1032 and ADT7461) do not implement the SMBus
> -alert protocol properly so additional care is needed: the ALERT output is
> -disabled when an alert is received, and is re-enabled only when the alarm
> -is gone. Otherwise the chip would block alerts from other chips in the bus
> -as long as the alarm is active.
> +The Analog Devices chips (ADM1032, ADT7461, ADT7461A, and NCT1008) do not

The NCT1008 has been introduced as an ON Semiconductor part in the
supported chip list, so it's a little confusing. I'll rephrase it.

> +implement the SMBus alert protocol properly so additional care is needed:
> +the ALERT output is disabled when an alert is received, and is re-enabled
> +only when the alarm is gone. Otherwise the chip would block alerts from other
> +chips in the bus as long as the alarm is active.
>  
>  PEC Support
>  -----------
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 060ef63..92d0251 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -618,10 +618,10 @@ config SENSORS_LM90
>  	depends on I2C
>  	help
>  	  If you say yes here you get support for National Semiconductor LM90,
> -	  LM86, LM89 and LM99, Analog Devices ADM1032 and ADT7461, Maxim
> -	  MAX6646, MAX6647, MAX6648, MAX6649, MAX6657, MAX6658, MAX6659,
> -	  MAX6680, MAX6681, MAX6692, MAX6695, MAX6696, and Winbond/Nuvoton
> -	  W83L771W/G/AWG/ASG sensor chips.
> +	  LM86, LM89 and LM99, Analog Devices ADM1032, ADT7461, and ADT7461A,
> +	  Maxim MAX6646, MAX6647, MAX6648, MAX6649, MAX6657, MAX6658, MAX6659,
> +	  MAX6680, MAX6681, MAX6692, MAX6695, MAX6696, ON Semiconductor NCT1008,
> +	  and Winbond/Nuvoton W83L771W/G/AWG/ASG 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 812781c..e19b87c 100644
> --- a/drivers/hwmon/lm90.c
> +++ b/drivers/hwmon/lm90.c
> @@ -49,10 +49,10 @@
>   * chips, but support three temperature sensors instead of two. MAX6695
>   * and MAX6696 only differ in the pinout so they can be treated identically.
>   *
> - * This driver also supports the ADT7461 chip from Analog Devices.
> - * It's supported in both compatibility and extended mode. It is mostly
> - * compatible with LM90 except for a data format difference for the
> - * temperature value registers.
> + * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
> + * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
> + * and extended mode. They are is mostly compatible with LM90 except for a data

One "is" too much, I'll remove it.

> + * format difference for the temperature value registers.
>   *
>   * Since the LM90 was the first chipset supported by this driver, most
>   * comments will refer to this chipset, but are actually general and
> @@ -88,9 +88,10 @@
>   * Addresses to scan
>   * Address is fully defined internally and cannot be changed except for
>   * MAX6659, MAX6680 and MAX6681.
> - * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6649, MAX6657,
> - * MAX6658 and W83L771 have address 0x4c.
> - * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d.
> + * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
> + * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
> + * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
> + * have address 0x4d.
>   * MAX6647 has address 0x4e.
>   * MAX6659 can have address 0x4c, 0x4d or 0x4e.
>   * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
> @@ -174,6 +175,7 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
>  static const struct i2c_device_id lm90_id[] = {
>  	{ "adm1032", adm1032 },
>  	{ "adt7461", adt7461 },
> +	{ "adt7461a", adt7461 },
>  	{ "lm90", lm90 },
>  	{ "lm86", lm86 },
>  	{ "lm89", lm86 },
> @@ -188,6 +190,7 @@ static const struct i2c_device_id lm90_id[] = {
>  	{ "max6681", max6680 },
>  	{ "max6695", max6696 },
>  	{ "max6696", max6696 },
> +	{ "nct1008", adt7461 },
>  	{ "w83l771", w83l771 },
>  	{ }
>  };
> @@ -1153,6 +1156,11 @@ static int lm90_detect(struct i2c_client *new_client,
>  		 && (reg_config1 & 0x1B) == 0x00
>  		 && reg_convrate <= 0x0A) {
>  			name = "adt7461";
> +		} else
> +		if (chip_id == 0x57 /* ADT7461A, NCT1008 */
> +		 && (reg_config1 & 0x1B) == 0x00
> +		 && reg_convrate <= 0x0A) {
> +			name = "adt7461a";
>  		}
>  	} else
>  	if (man_id == 0x4D) { /* Maxim */

Consider this patch applied, thanks.

-- 
Jean Delvare
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