linux-kernel - Re: [PATCHv2 06/16] hwmon: tmp102: expose to thermal fw via DT nodes

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Date:	Wed, 18 Sep 2013 10:17:51 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Eduardo Valentin <eduardo.valentin@...com>,
	<swarren@...dotorg.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ian.campbell@...rix.com>,
	<rob.herring@...xeda.com>, <khali@...ux-fr.org>,
	<rui.zhang@...el.com>, <wni@...dia.com>, <grant.likely@...aro.org>,
	<durgadoss.r@...el.com>, <linux-pm@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <lm-sensors@...sensors.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 06/16] hwmon: tmp102: expose to thermal fw via DT nodes

On 18-09-2013 07:06, Guenter Roeck wrote:
> On Tue, Sep 17, 2013 at 06:34:05PM -0400, Eduardo Valentin wrote:
>> This patch adds to tmp102 temperature sensor the possibility
>> to expose itself as thermal zone device, registered on the
>> thermal framework.
>>
>> The thermal zone is built only if a device tree node
>> describing a thermal zone for this sensor is present
>> inside the tmp102 DT node. Otherwise, the driver behavior
>> will be the same.
>>
>> Cc: Jean Delvare <khali@...ux-fr.org>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>> Cc: lm-sensors@...sensors.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
>> ---
>>  drivers/hwmon/tmp102.c | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> ---
>>
>> Guenter,
>>
>> Here is a version without the warnings, as requested.
>>
>> Eduardo
>>
>> diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
>> index d7b47ab..dc96598 100644
>> --- a/drivers/hwmon/tmp102.c
>> +++ b/drivers/hwmon/tmp102.c
>> @@ -27,6 +27,8 @@
>>  #include <linux/mutex.h>
>>  #include <linux/device.h>
>>  #include <linux/jiffies.h>
>> +#include <linux/thermal.h>
>> +#include <linux/of.h>
>>  
>>  #define	DRIVER_NAME "tmp102"
>>  
>> @@ -50,6 +52,7 @@
>>  
>>  struct tmp102 {
>>  	struct device *hwmon_dev;
>> +	struct thermal_zone_device *tz;
>>  	struct mutex lock;
>>  	u16 config_orig;
>>  	unsigned long last_update;
>> @@ -93,6 +96,15 @@ static struct tmp102 *tmp102_update_device(struct i2c_client *client)
>>  	return tmp102;
>>  }
>>  
>> +static int tmp102_read_temp(void *dev, long *temp)
>> +{
>> +	struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
>> +
>> +	*temp = tmp102->temp[0];
>> +
>> +	return 0;
>> +}
>> +
>>  static ssize_t tmp102_show_temp(struct device *dev,
>>  				struct device_attribute *attr,
>>  				char *buf)
>> @@ -204,6 +216,12 @@ static int tmp102_probe(struct i2c_client *client,
>>  		goto fail_remove_sysfs;
>>  	}
>>  
>> +	tmp102->tz = thermal_zone_of_sensor_register(&client->dev, 0,
>> +						     &client->dev,
>> +						     tmp102_read_temp, NULL);
>> +	if (IS_ERR(tmp102->tz))
>> +		tmp102->tz = NULL;
>> +
>>  	dev_info(&client->dev, "initialized\n");
>>  
>>  	return 0;
>> @@ -220,6 +238,8 @@ static int tmp102_remove(struct i2c_client *client)
>>  {
>>  	struct tmp102 *tmp102 = i2c_get_clientdata(client);
>>  
>> +	/* thermal zone life cycle is not our responsibility */
> 
> This comment does not provide any value. Please drop it from both drivers.
> Sorry I missed that earlier.

Yeah, I even forgot to drop it myself. No problem, I am resending both
without it.

> 
>> +	thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz);
>>  	hwmon_device_unregister(tmp102->hwmon_dev);
>>  	sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
>>  
>> -- 
>> 1.8.2.1.342.gfa7285d
>>
>>
> 
> 


-- 
You have got to be excited about what you are doing. (L. Lamport)

Eduardo Valentin


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