linux-kernel - Re: [RFC PATCH 04/14] hwmon: tmp102: expose to thermal fw via DT nodes

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Message-ID: <20130827102708.GE19893@e106331-lin.cambridge.arm.com>
Date:	Tue, 27 Aug 2013 11:27:08 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"rui.zhang@...el.com" <rui.zhang@...el.com>,
	"wni@...dia.com" <wni@...dia.com>,
	"durgadoss.r@...el.com" <durgadoss.r@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [RFC PATCH 04/14] hwmon: tmp102: expose to thermal fw via DT
 nodes

On Sat, Aug 24, 2013 at 12:15:45AM +0100, 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.

Similarly to the lm75, this requires a binding document update, but I
don't think the binding extension's necessary anyway.

Thanks,
Mark.

> 
> 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 | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
> index d7b47ab..0f1e44a 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, unsigned 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)
> @@ -204,10 +216,23 @@ static int tmp102_probe(struct i2c_client *client,
>  		goto fail_remove_sysfs;
>  	}
>  
> +	if (of_find_property(client->dev.of_node, "monitored-zones", NULL)) {
> +		tmp102->tz = thermal_zone_of_device_register(&client->dev, 0,
> +							     false, /* -hwmon */
> +							     &client->dev,
> +							     tmp102_read_temp);
> +		if (IS_ERR(tmp102->tz)) {
> +			status = PTR_ERR(tmp102->tz);
> +			goto exit_hwmon;
> +		}
> +	}
> +
>  	dev_info(&client->dev, "initialized\n");
>  
>  	return 0;
>  
> +exit_hwmon:
> +	hwmon_device_unregister(tmp102->hwmon_dev);
>  fail_remove_sysfs:
>  	sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
>  fail_restore_config:
> @@ -220,6 +245,7 @@ static int tmp102_remove(struct i2c_client *client)
>  {
>  	struct tmp102 *tmp102 = i2c_get_clientdata(client);
>  
> +	thermal_zone_device_unregister(tmp102->tz);
>  	hwmon_device_unregister(tmp102->hwmon_dev);
>  	sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
>  
> -- 
> 1.8.2.1.342.gfa7285d
> 
> 
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