Re: [PATCH 1/3] lm90: separate register accessors from sysfs

[Guenter Roeck <linux@xxxxxxxxxxxx>]

On 01/21/2016 11:34 AM, Stéphan Kochen wrote:
> Add additional support functions `lm90_get_*` and `lm90_set_*` extracted
> from the sysfs routines. The sysfs routines are now just stubs wrapping
> the new support functions.
>
> This way we have a consistent register access interface, which can be
> used from other integrations down the line. To avoid confusion, all
> sysfs methods are now prefixed `lm90_sysfs_*`.
>
> To accomplish this, the `lm90_update_device` signature has changed and
> is now `lm90_update`, taking data directly. It no longer serves the
> dual purpose of update function *and* driver data getter.
>
> `lm90_set_convrate`, `lm90_select_remote_channel` and `lm90_init_client`
> also had redundant i2c client parameters, which have been removed.
>
> Signed-off-by: Stéphan Kochen <stephan@xxxxxxxxx>
> ---
>   drivers/hwmon/lm90.c | 511 ++++++++++++++++++++++++++++++---------------------
>   1 file changed, 300 insertions(+), 211 deletions(-)
>
> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> index c9ff08d..88daf72 100644
> --- a/drivers/hwmon/lm90.c
> +++ b/drivers/hwmon/lm90.c
> @@ -473,10 +473,10 @@ static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
>    * various registers have different meanings as a result of selecting a
>    * non-default remote channel.
>    */
> -static inline void lm90_select_remote_channel(struct i2c_client *client,
> -					      struct lm90_data *data,
> -					      int channel)
> +static inline void lm90_select_remote_channel(
> +		struct lm90_data *data, int channel)

Very much personal preference here, unrelated change, and violates coding style.

Please only one logical change per patch. If you think it is worthwhile to remove
the client argument, prepare a separate patch with only that change, and show
that it reduces code size. Also please make sure that your patch follows
coding style.

>   {
> +	struct i2c_client *client = data->client;
>   	u8 config;
>
>   	if (data->kind == max6696) {
> @@ -490,32 +490,10 @@ static inline void lm90_select_remote_channel(struct i2c_client *client,
>   }
>
>   /*
> - * Set conversion rate.
> - * client->update_lock must be held when calling this function (unless we are
> - * in detection or initialization steps).
> + * Update all current register values
>    */
> -static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
> -			      unsigned int interval)
> -{
> -	int i;
> -	unsigned int update_interval;
> -
> -	/* Shift calculations to avoid rounding errors */
> -	interval <<= 6;
> -
> -	/* find the nearest update rate */
> -	for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
> -	     i < data->max_convrate; i++, update_interval >>= 1)
> -		if (interval >= update_interval * 3 / 4)
> -			break;
> -
> -	i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
> -	data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
> -}
> -
> -static struct lm90_data *lm90_update_device(struct device *dev)
> +static void lm90_update(struct lm90_data *data)
>   {
> -	struct lm90_data *data = dev_get_drvdata(dev);
>   	struct i2c_client *client = data->client;
>   	unsigned long next_update;
>
> @@ -583,7 +561,7 @@ static struct lm90_data *lm90_update_device(struct device *dev)
>   		data->alarms = alarms;	/* save as 16 bit value */
>
>   		if (data->kind == max6696) {
> -			lm90_select_remote_channel(client, data, 1);
> +			lm90_select_remote_channel(data, 1);
>   			lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
>   				      &data->temp8[REMOTE2_CRIT]);
>   			lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
> @@ -595,7 +573,7 @@ static struct lm90_data *lm90_update_device(struct device *dev)
>   				data->temp11[REMOTE2_LOW] = h << 8;
>   			if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
>   				data->temp11[REMOTE2_HIGH] = h << 8;
> -			lm90_select_remote_channel(client, data, 0);
> +			lm90_select_remote_channel(data, 0);
>
>   			if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
>   					   &alarms))
> @@ -624,8 +602,6 @@ static struct lm90_data *lm90_update_device(struct device *dev)
>   	}
>
>   	mutex_unlock(&data->update_lock);
> -
> -	return data;
>   }
>
>   /*
> @@ -756,32 +732,31 @@ static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
>   }
>
>   /*
> - * Sysfs stuff
> + * Register accessors. Getters trigger an update. Setters have locked variants
> + * that require update_lock to be held.
>    */
>
> -static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
> -			  char *buf)
> +static int lm90_get_temp8(struct lm90_data *data, int index)
>   {
> -	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> -	struct lm90_data *data = lm90_update_device(dev);
>   	int temp;
>
> +	lm90_update(data);
> +
>   	if (data->kind == adt7461 || data->kind == tmp451)
> -		temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
> +		temp = temp_from_u8_adt7461(data, data->temp8[index]);
>   	else if (data->kind == max6646)
> -		temp = temp_from_u8(data->temp8[attr->index]);
> +		temp = temp_from_u8(data->temp8[index]);
>   	else
> -		temp = temp_from_s8(data->temp8[attr->index]);
> +		temp = temp_from_s8(data->temp8[index]);
>
>   	/* +16 degrees offset for temp2 for the LM99 */
> -	if (data->kind == lm99 && attr->index == 3)
> +	if (data->kind == lm99 && index == 3)
>   		temp += 16000;
>
> -	return sprintf(buf, "%d\n", temp);
> +	return temp;
>   }
>
> -static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
> -			 const char *buf, size_t count)
> +static void lm90_set_temp8_locked(struct lm90_data *data, int index, long val)
>   {
>   	static const u8 reg[TEMP8_REG_NUM] = {
>   		LM90_REG_W_LOCAL_LOW,
> @@ -794,90 +769,73 @@ static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
>   		MAX6659_REG_W_REMOTE_EMERG,
>   	};
>
> -	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> -	struct lm90_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
> -	int nr = attr->index;
> -	long val;
> -	int err;
> -
> -	err = kstrtol(buf, 10, &val);
> -	if (err < 0)
> -		return err;
> -
>   	/* +16 degrees offset for temp2 for the LM99 */
> -	if (data->kind == lm99 && attr->index == 3)
> +	if (data->kind == lm99 && index == 3)
>   		val -= 16000;
>
> -	mutex_lock(&data->update_lock);
>   	if (data->kind == adt7461 || data->kind == tmp451)
> -		data->temp8[nr] = temp_to_u8_adt7461(data, val);
> +		data->temp8[index] = temp_to_u8_adt7461(data, val);
>   	else if (data->kind == max6646)
> -		data->temp8[nr] = temp_to_u8(val);
> +		data->temp8[index] = temp_to_u8(val);
>   	else
> -		data->temp8[nr] = temp_to_s8(val);
> +		data->temp8[index] = temp_to_s8(val);
>
> -	lm90_select_remote_channel(client, data, nr >= 6);
> -	i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
> -	lm90_select_remote_channel(client, data, 0);
> +	lm90_select_remote_channel(data, index >= 6);
> +	i2c_smbus_write_byte_data(data->client, reg[index], data->temp8[index]);
> +	lm90_select_remote_channel(data, 0);
> +}
>
> +static void lm90_set_temp8(struct lm90_data *data, int index, long val)
> +{
> +	mutex_lock(&data->update_lock);
> +	lm90_set_temp8_locked(data, index, val);
>   	mutex_unlock(&data->update_lock);
> -	return count;
>   }
>
> -static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
> -			   char *buf)
> +static int lm90_get_temp11(struct lm90_data *data, int index)
>   {
> -	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
> -	struct lm90_data *data = lm90_update_device(dev);
>   	int temp;
>
> +	lm90_update(data);
> +
>   	if (data->kind == adt7461 || data->kind == tmp451)
> -		temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
> +		temp = temp_from_u16_adt7461(data, data->temp11[index]);
>   	else if (data->kind == max6646)
> -		temp = temp_from_u16(data->temp11[attr->index]);
> +		temp = temp_from_u16(data->temp11[index]);
>   	else
> -		temp = temp_from_s16(data->temp11[attr->index]);
> +		temp = temp_from_s16(data->temp11[index]);
>
>   	/* +16 degrees offset for temp2 for the LM99 */
> -	if (data->kind == lm99 &&  attr->index <= 2)
> +	if (data->kind == lm99 && index <= 2)
>   		temp += 16000;
>
> -	return sprintf(buf, "%d\n", temp);
> +	return temp;
>   }
>
> -static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
> -			  const char *buf, size_t count)
> +static void lm90_set_temp11_locked(struct lm90_data *data, int index, long val)
>   {
> -	struct {
> -		u8 high;
> -		u8 low;
> -		int channel;
> -	} reg[5] = {
> -		{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
> -		{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
> -		{ LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
> -		{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
> -		{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
> -	};

Another set of personal preference changes.

> -
> -	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
> -	struct lm90_data *data = dev_get_drvdata(dev);
>   	struct i2c_client *client = data->client;
> -	int nr = attr->nr;
> -	int index = attr->index;
> -	long val;
> -	int err;
> +	u8 high, low, channel;
>
> -	err = kstrtol(buf, 10, &val);
> -	if (err < 0)
> -		return err;
> +#define SELECT_REGS(_reg, _channel) { \
> +	high = LM90_REG_W_##_reg##H; \
> +	low = LM90_REG_W_##_reg##L; \
> +	channel = _channel; \
> +}

We have been trying to get rid of function defines such as this one.
Most of the time it increases code size, and reduces readability.
Plus, it increases the amount of time we have to spend reviewing
the code to ensure it is correct.

> +	switch (index) {
> +	case REMOTE_LOW:    SELECT_REGS(REMOTE_LOW,  0); break;
> +	case REMOTE_HIGH:   SELECT_REGS(REMOTE_HIGH, 0); break;
> +	case REMOTE_OFFSET: SELECT_REGS(REMOTE_OFFS, 0); break;
> +	case REMOTE2_LOW:   SELECT_REGS(REMOTE_LOW,  1); break;
> +	case REMOTE2_HIGH:  SELECT_REGS(REMOTE_HIGH, 1); break;
> +	default: return;

... and, in this case, introduces checkpatch errors.

This patch is clearly more than what its headline says. It is
too complex to review as single patch. Please split into
logical changes, and explain why you make those changes.

Thanks,
Guenter


> +	}
> +#undef SELECT_REGS
>
>   	/* +16 degrees offset for temp2 for the LM99 */
>   	if (data->kind == lm99 && index <= 2)
>   		val -= 16000;
>
> -	mutex_lock(&data->update_lock);
>   	if (data->kind == adt7461 || data->kind == tmp451)
>   		data->temp11[index] = temp_to_u16_adt7461(data, val);
>   	else if (data->kind == max6646)
> @@ -887,54 +845,46 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
>   	else
>   		data->temp11[index] = temp_to_s8(val) << 8;
>
> -	lm90_select_remote_channel(client, data, reg[nr].channel);
> -	i2c_smbus_write_byte_data(client, reg[nr].high,
> -				  data->temp11[index] >> 8);
> +	lm90_select_remote_channel(data, channel);
> +	i2c_smbus_write_byte_data(client, high,
> +			data->temp11[index] >> 8);
>   	if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
> -		i2c_smbus_write_byte_data(client, reg[nr].low,
> -					  data->temp11[index] & 0xff);
> -	lm90_select_remote_channel(client, data, 0);
> +		i2c_smbus_write_byte_data(client, low,
> +				data->temp11[index] & 0xff);
> +	lm90_select_remote_channel(data, 0);
> +}
>
> +static void lm90_set_temp11(struct lm90_data *data, int index, long val)
> +{
> +	mutex_lock(&data->update_lock);
> +	lm90_set_temp11_locked(data, index, val);
>   	mutex_unlock(&data->update_lock);
> -	return count;
>   }
>
> -static ssize_t show_temphyst(struct device *dev,
> -			     struct device_attribute *devattr,
> -			     char *buf)
> +static ssize_t lm90_get_temphyst(struct lm90_data *data, int index)
>   {
> -	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> -	struct lm90_data *data = lm90_update_device(dev);
>   	int temp;
>
> +	lm90_update(data);
> +
>   	if (data->kind == adt7461 || data->kind == tmp451)
> -		temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
> +		temp = temp_from_u8_adt7461(data, data->temp8[index]);
>   	else if (data->kind == max6646)
> -		temp = temp_from_u8(data->temp8[attr->index]);
> +		temp = temp_from_u8(data->temp8[index]);
>   	else
> -		temp = temp_from_s8(data->temp8[attr->index]);
> +		temp = temp_from_s8(data->temp8[index]);
>
>   	/* +16 degrees offset for temp2 for the LM99 */
> -	if (data->kind == lm99 && attr->index == 3)
> +	if (data->kind == lm99 && index == 3)
>   		temp += 16000;
>
> -	return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
> +	return temp - temp_from_s8(data->temp_hyst);
>   }
>
> -static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
> -			    const char *buf, size_t count)
> +static void lm90_set_temphyst_locked(struct lm90_data *data, long val)
>   {
> -	struct lm90_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
> -	long val;
> -	int err;
>   	int temp;
>
> -	err = kstrtol(buf, 10, &val);
> -	if (err < 0)
> -		return err;
> -
> -	mutex_lock(&data->update_lock);
>   	if (data->kind == adt7461 || data->kind == tmp451)
>   		temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
>   	else if (data->kind == max6646)
> @@ -943,43 +893,167 @@ static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
>   		temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
>
>   	data->temp_hyst = hyst_to_reg(temp - val);
> -	i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
> -				  data->temp_hyst);
> +	i2c_smbus_write_byte_data(data->client, LM90_REG_W_TCRIT_HYST,
> +			data->temp_hyst);
> +}
> +
> +static void lm90_set_temphyst(struct lm90_data *data, long val)
> +{
> +	mutex_lock(&data->update_lock);
> +	lm90_set_temphyst_locked(data, val);
> +	mutex_unlock(&data->update_lock);
> +}
> +
> +static void lm90_set_convrate_locked(struct lm90_data *data, unsigned int val)
> +{
> +	int i;
> +	unsigned int update_interval;
> +
> +	/* Shift calculations to avoid rounding errors */
> +	val <<= 6;
> +
> +	/* find the nearest update rate */
> +	for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
> +	     i < data->max_convrate; i++, update_interval >>= 1)
> +		if (val >= update_interval * 3 / 4)
> +			break;
> +
> +	i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, i);
> +	data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
> +}
> +
> +static void lm90_set_convrate(struct lm90_data *data, unsigned int val)
> +{
> +	mutex_lock(&data->update_lock);
> +	lm90_set_convrate_locked(data, val);
>   	mutex_unlock(&data->update_lock);
> +}
> +
> +/*
> + * Sysfs stuff
> + */
> +
> +static ssize_t lm90_sysfs_show_temp8(
> +		struct device *dev, struct device_attribute *devattr,
> +		char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%d\n", lm90_get_temp8(data, attr->index));
> +}
> +
> +static ssize_t lm90_sysfs_set_temp8(
> +		struct device *dev, struct device_attribute *devattr,
> +		const char *buf, size_t count)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +	long val;
> +	int err;
> +
> +	err = kstrtol(buf, 10, &val);
> +	if (err < 0)
> +		return err;
> +
> +	lm90_set_temp8(data, attr->index, val);
> +
>   	return count;
>   }
>
> -static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
> -			   char *buf)
> +static ssize_t lm90_sysfs_show_temp11(
> +		struct device *dev, struct device_attribute *devattr,
> +		char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%d\n", lm90_get_temp11(data, attr->index));
> +}
> +
> +static ssize_t lm90_sysfs_set_temp11(
> +		struct device *dev, struct device_attribute *devattr,
> +		const char *buf, size_t count)
>   {
> -	struct lm90_data *data = lm90_update_device(dev);
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +	long val;
> +	int err;
> +
> +	err = kstrtol(buf, 10, &val);
> +	if (err < 0)
> +		return err;
> +
> +	lm90_set_temp11(data, attr->index, val);
> +
> +	return count;
> +}
> +
> +static ssize_t lm90_sysfs_show_temphyst(
> +		struct device *dev, struct device_attribute *devattr,
> +		char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%d\n", lm90_get_temphyst(data, attr->index));
> +}
> +
> +static ssize_t lm90_sysfs_set_temphyst(
> +		struct device *dev, struct device_attribute *dummy,
> +		const char *buf, size_t count)
> +{
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +	long val;
> +	int err;
> +
> +	err = kstrtol(buf, 10, &val);
> +	if (err < 0)
> +		return err;
> +
> +	lm90_set_temphyst(data, val);
> +
> +	return count;
> +}
> +
> +static ssize_t lm90_sysfs_show_alarms(
> +		struct device *dev, struct device_attribute *dummy,
> +		char *buf)
> +{
> +	struct lm90_data *data = dev_get_drvdata(dev);
> +
> +	lm90_update(data);
> +
>   	return sprintf(buf, "%d\n", data->alarms);
>   }
>
> -static ssize_t show_alarm(struct device *dev, struct device_attribute
> -			  *devattr, char *buf)
> +static ssize_t lm90_sysfs_show_alarm(
> +		struct device *dev, struct device_attribute *devattr,
> +		char *buf)
>   {
>   	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> -	struct lm90_data *data = lm90_update_device(dev);
> +	struct lm90_data *data = dev_get_drvdata(dev);
>   	int bitnr = attr->index;
>
> +	lm90_update(data);
> +
>   	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
>   }
>
> -static ssize_t show_update_interval(struct device *dev,
> -				    struct device_attribute *attr, char *buf)
> +static ssize_t lm90_sysfs_show_update_interval(
> +		struct device *dev, struct device_attribute *attr,
> +		char *buf)
>   {
>   	struct lm90_data *data = dev_get_drvdata(dev);
>
>   	return sprintf(buf, "%u\n", data->update_interval);
>   }
>
> -static ssize_t set_update_interval(struct device *dev,
> -				   struct device_attribute *attr,
> -				   const char *buf, size_t count)
> +static ssize_t lm90_sysfs_set_update_interval(
> +		struct device *dev, struct device_attribute *attr,
> +		const char *buf, size_t count)
>   {
>   	struct lm90_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
>   	unsigned long val;
>   	int err;
>
> @@ -987,49 +1061,55 @@ static ssize_t set_update_interval(struct device *dev,
>   	if (err)
>   		return err;
>
> -	mutex_lock(&data->update_lock);
> -	lm90_set_convrate(client, data, clamp_val(val, 0, 100000));
> -	mutex_unlock(&data->update_lock);
> +	lm90_set_convrate(data, clamp_val(val, 0, 100000));
>
>   	return count;
>   }
>
> -static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL,
> -	0, LOCAL_TEMP);
> -static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL,
> -	0, REMOTE_TEMP);
> -static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, LOCAL_LOW);
> -static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
> -	set_temp11, 0, REMOTE_LOW);
> -static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, LOCAL_HIGH);
> -static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
> -	set_temp11, 1, REMOTE_HIGH);
> -static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, LOCAL_CRIT);
> -static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, REMOTE_CRIT);
> -static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
> -	set_temphyst, LOCAL_CRIT);
> -static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL,
> -	REMOTE_CRIT);
> -static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
> -	set_temp11, 2, REMOTE_OFFSET);
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
> +	lm90_sysfs_show_temp11, NULL, LOCAL_TEMP);
> +static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
> +	lm90_sysfs_show_temp11, NULL, REMOTE_TEMP);
> +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, LOCAL_LOW);
> +static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp11, lm90_sysfs_set_temp11, REMOTE_LOW);
> +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, LOCAL_HIGH);
> +static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp11, lm90_sysfs_set_temp11, REMOTE_HIGH);
> +static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, LOCAL_CRIT);
> +static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, REMOTE_CRIT);
> +static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temphyst, lm90_sysfs_set_temphyst, LOCAL_CRIT);
> +static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO,
> +	lm90_sysfs_show_temphyst, NULL, REMOTE_CRIT);
> +static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp11, lm90_sysfs_set_temp11, REMOTE_OFFSET);
>
>   /* Individual alarm files */
> -static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
> -static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
> -static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
> -static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
> -static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
> -static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
> -static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
> +static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 0);
> +static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 1);
> +static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 2);
> +static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 3);
> +static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 4);
> +static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 5);
> +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 6);
>   /* Raw alarm file for compatibility */
> -static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
> +static DEVICE_ATTR(alarms, S_IRUGO,
> +	lm90_sysfs_show_alarms, NULL);
>
> -static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
> -		   set_update_interval);
> +static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
> +	lm90_sysfs_show_update_interval, lm90_sysfs_set_update_interval);
>
>   static struct attribute *lm90_attributes[] = {
>   	&sensor_dev_attr_temp1_input.dev_attr.attr,
> @@ -1071,14 +1151,14 @@ static const struct attribute_group lm90_temp2_offset_group = {
>   /*
>    * Additional attributes for devices with emergency sensors
>    */
> -static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, LOCAL_EMERG);
> -static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, REMOTE_EMERG);
> -static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
> -			  NULL, LOCAL_EMERG);
> -static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
> -			  NULL, REMOTE_EMERG);
> +static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, LOCAL_EMERG);
> +static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, REMOTE_EMERG);
> +static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO,
> +	lm90_sysfs_show_temphyst, NULL, LOCAL_EMERG);
> +static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO,
> +	lm90_sysfs_show_temphyst, NULL, REMOTE_EMERG);
>
>   static struct attribute *lm90_emergency_attributes[] = {
>   	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
> @@ -1092,8 +1172,10 @@ static const struct attribute_group lm90_emergency_group = {
>   	.attrs = lm90_emergency_attributes,
>   };
>
> -static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
> -static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
> +static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 15);
> +static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 13);
>
>   static struct attribute *lm90_emergency_alarm_attributes[] = {
>   	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
> @@ -1108,26 +1190,31 @@ static const struct attribute_group lm90_emergency_alarm_group = {
>   /*
>    * Additional attributes for devices with 3 temperature sensors
>    */
> -static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL,
> -	0, REMOTE2_TEMP);
> -static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
> -	set_temp11, 3, REMOTE2_LOW);
> -static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
> -	set_temp11, 4, REMOTE2_HIGH);
> -static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, REMOTE2_CRIT);
> -static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL,
> -	REMOTE2_CRIT);
> -static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
> -	set_temp8, REMOTE2_EMERG);
> -static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
> -			  NULL, REMOTE2_EMERG);
> -
> -static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
> -static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
> -static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
> -static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
> -static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
> +static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO,
> +	lm90_sysfs_show_temp11, NULL, REMOTE2_TEMP);
> +static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp11, lm90_sysfs_set_temp11, REMOTE2_LOW);
> +static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp11, lm90_sysfs_set_temp11, REMOTE2_HIGH);
> +static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, REMOTE2_CRIT);
> +static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO,
> +	lm90_sysfs_show_temphyst, NULL, REMOTE2_CRIT);
> +static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_temp8, lm90_sysfs_set_temp8, REMOTE2_EMERG);
> +static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO,
> +	lm90_sysfs_show_temphyst, NULL, REMOTE2_EMERG);
> +
> +static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 9);
> +static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 10);
> +static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 11);
> +static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 12);
> +static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO,
> +	lm90_sysfs_show_alarm, NULL, 14);
>
>   static struct attribute *lm90_temp3_attributes[] = {
>   	&sensor_dev_attr_temp3_input.dev_attr.attr,
> @@ -1151,15 +1238,15 @@ static const struct attribute_group lm90_temp3_group = {
>   };
>
>   /* pec used for ADM1032 only */
> -static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
> -			char *buf)
> +static ssize_t lm90_sysfs_show_pec(struct device *dev,
> +		struct device_attribute *dummy, char *buf)
>   {
>   	struct i2c_client *client = to_i2c_client(dev);
>   	return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
>   }
>
> -static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
> -		       const char *buf, size_t count)
> +static ssize_t lm90_sysfs_set_pec(struct device *dev,
> +		struct device_attribute *dummy, const char *buf, size_t count)
>   {
>   	struct i2c_client *client = to_i2c_client(dev);
>   	long val;
> @@ -1183,7 +1270,8 @@ static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
>   	return count;
>   }
>
> -static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
> +static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO,
> +	lm90_sysfs_show_pec, lm90_sysfs_set_pec);
>
>   /*
>    * Real code
> @@ -1413,8 +1501,9 @@ static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data)
>   				  data->config_orig);
>   }
>
> -static void lm90_init_client(struct i2c_client *client, struct lm90_data *data)
> +static void lm90_init_client(struct lm90_data *data)
>   {
> +	struct i2c_client *client = data->client;
>   	u8 config, convrate;
>
>   	if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) {
> @@ -1426,7 +1515,7 @@ static void lm90_init_client(struct i2c_client *client, struct lm90_data *data)
>   	/*
>   	 * Start the conversions.
>   	 */
> -	lm90_set_convrate(client, data, 500);	/* 500ms; 2Hz conversion rate */
> +	lm90_set_convrate_locked(data, 500);  /* 500ms / 2Hz  */
>   	if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
>   		dev_warn(&client->dev, "Initialization failed!\n");
>   		return;
> @@ -1557,7 +1646,7 @@ static int lm90_probe(struct i2c_client *client,
>   	data->max_convrate = lm90_params[data->kind].max_convrate;
>
>   	/* Initialize the LM90 chip */
> -	lm90_init_client(client, data);
> +	lm90_init_client(data);
>
>   	/* Register sysfs hooks */
>   	data->groups[groups++] = &lm90_group;

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