linux-kernel - Re: [PATCH 1/1] HWMON: TMP102 - Added support for 12 bit data

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Message-ID: <20110623100616.4573741f@endymion.delvare>
Date:	Thu, 23 Jun 2011 10:06:16 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Ankur Patel <bkankur@...il.com>
Cc:	Guenter Roeck <guenter.roeck@...csson.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] HWMON: TMP102 - Added support for 12 bit data

On Wed, 22 Jun 2011 07:51:39 +0530, Ankur Patel wrote:
> From: Ankur Patel <ankur.patel@...pment.in>
> 
> In the tmp102.ko driver support for 12 bit data is added. Also, the
> sysfs names are replaced with the actual chip supported fuctionality
> names.

Nack. These attribute names are standard, see
Documentation/hwmon/sysfs-interface. You don't get to change them.

What problem were you trying to solve? libsensors expects the attribute
names which are in use today.

> 
> Signed-off-by: Ankur Patel <ankur.patel@...pment.in>
> ---
>  drivers/hwmon/tmp102.c |   40 ++++++++++++++++++++++++++--------------
>  1 files changed, 26 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
> index 5bd1949..a13b572 100644
> --- a/drivers/hwmon/tmp102.c
> +++ b/drivers/hwmon/tmp102.c
> @@ -47,6 +47,9 @@
>  #define	TMP102_TLOW_REG			0x02
>  #define	TMP102_THIGH_REG		0x03
>  
> +#define TMP102_CONFIG  (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
> +#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
> +
>  struct tmp102 {
>  	struct device *hwmon_dev;
>  	struct mutex lock;
> @@ -68,16 +71,26 @@ static inline int tmp102_write_reg(struct i2c_client *client, u8 reg, u16 val)
>  	return i2c_smbus_write_word_data(client, reg, swab16(val));
>  }
>  
> -/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
> +/* convert left adjusted TMP102 register value to milliCelsius for 13 bit &
> + * 12 bit by dividing with 128 & 256 respectively*/
>  static inline int tmp102_reg_to_mC(s16 val)
>  {
> -	return ((val & ~0x01) * 1000) / 128;
> +	#if TMP102_CONFIG & TMP102_CONF_EM
> +		return ((val & ~0x01) * 1000) / 128;
> +	#else
> +		return ((val & ~0x01) * 1000) / 256;
> +	#endif
>  }
>  
> -/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
> +/* convert milliCelsius to left adjusted TMP102 register value for 13 bit &
> + * 12 bit by multiplying with 128 & 256 respectivley*/
>  static inline u16 tmp102_mC_to_reg(int val)
>  {
> -	return (val * 128) / 1000;
> +	#if TMP102_CONFIG & TMP102_CONF_EM
> +		return (val * 128) / 1000;
> +	#else
> +		return (val * 256) / 1000;
> +	#endif
>  }
>  
>  static const u8 tmp102_reg[] = {
> @@ -126,7 +139,9 @@ static ssize_t tmp102_set_temp(struct device *dev,
>  
>  	if (strict_strtol(buf, 10, &val) < 0)
>  		return -EINVAL;
> -	val = SENSORS_LIMIT(val, -256000, 255000);
> +	/* It will limit the Input temperature range to -55 Deg. Cel to
> +	 * 150 Deg. Cel */
> +	val = val = SENSORS_LIMIT(val, -55000, 150000);
>  
>  	mutex_lock(&tmp102->lock);
>  	tmp102->temp[sda->index] = val;
> @@ -138,16 +153,16 @@ static ssize_t tmp102_set_temp(struct device *dev,
>  
>  static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
>  
> -static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
> -			  tmp102_set_temp, 1);
> +static SENSOR_DEVICE_ATTR(temp1_low_thresold, S_IWUSR | S_IRUGO,
> +					tmp102_show_temp, tmp102_set_temp, 1);
>  
> -static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
> -			  tmp102_set_temp, 2);
> +static SENSOR_DEVICE_ATTR(temp1_max_thresold, S_IWUSR | S_IRUGO,
> +\					tmp102_show_temp, tmp102_set_temp, 2);
>  
>  static struct attribute *tmp102_attributes[] = {
>  	&sensor_dev_attr_temp1_input.dev_attr.attr,
> -	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
> -	&sensor_dev_attr_temp1_max.dev_attr.attr,
> +	&sensor_dev_attr_temp1_low_thresold.dev_attr.attr,
> +	&sensor_dev_attr_temp1_max_thresold.dev_attr.attr,
>  	NULL
>  };
>  
> @@ -155,9 +170,6 @@ static const struct attribute_group tmp102_attr_group = {
>  	.attrs = tmp102_attributes,
>  };
>  
> -#define TMP102_CONFIG  (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
> -#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
> -
>  static int __devinit tmp102_probe(struct i2c_client *client,
>  				  const struct i2c_device_id *id)
>  {


-- 
Jean Delvare
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