> -----Original Message-----
> From: Eduardo Valentin [mailto:eduardo.valen...@ti.com]
> Sent: Friday, April 05, 2013 6:02 PM
> To: Zhang, Rui
> Cc: linux...@vger.kernel.org; linux-kernel@vger.kernel.org; R, Durgadoss;
> Eduardo Valentin
> Subject: [PATCHv3 1/3] thermal: introduce
> thermal_zone_get_zone_by_name helper function
>
> This patch adds a helper function to get a reference of
> a thermal zone, based on the zone type name.
>
> It will perform a zone name lookup and return a reference
> to a thermal zone device that matches the name requested.
> In case the zone is not found or when several zones match
> same name or if the required parameters are invalid, it will return
> the corresponding error code (ERR_PTR).
>
> Cc: Durgadoss R <durgados...@intel.com>
> Signed-off-by: Eduardo Valentin <eduardo.valen...@ti.com>
Looks okay to me.
Acked-by: Durgadoss R <durgados...@intel.com>
Thanks,
Durga
> ---
> drivers/thermal/thermal_sys.c | 38
> ++++++++++++++++++++++++++++++++++++++
> include/linux/thermal.h | 1 +
> 2 files changed, 39 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 5bd95d4..e9b636b 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -1790,6 +1790,44 @@ void thermal_zone_device_unregister(struct
> thermal_zone_device *tz)
> }
> EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
>
> +/**
> + * thermal_zone_get_zone_by_name() - search for a zone and returns its
> ref
> + * @name: thermal zone name to fetch the temperature
> + *
> + * When only one zone is found with the passed name, returns a reference
> to it.
> + *
> + * Return: On success returns a reference to an unique thermal zone with
> + * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for
> invalid
> + * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
> + */
> +struct thermal_zone_device *thermal_zone_get_zone_by_name(const
> char *name)
> +{
> + struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
> + unsigned int found = 0;
> +
> + if (!name)
> + goto exit;
> +
> + mutex_lock(&thermal_list_lock);
> + list_for_each_entry(pos, &thermal_tz_list, node)
> + if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
> + found++;
> + ref = pos;
> + }
> + mutex_unlock(&thermal_list_lock);
> +
> + /* nothing has been found, thus an error code for it */
> + if (found == 0)
> + ref = ERR_PTR(-ENODEV);
> + else if (found > 1)
> + /* Success only when an unique zone is found */
> + ref = ERR_PTR(-EEXIST);
> +
> +exit:
> + return ref;
> +}
> +EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
> +
> #ifdef CONFIG_NET
> static struct genl_family thermal_event_genl_family = {
> .id = GENL_ID_GENERATE,
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 542a39c..0cf9eb5 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -237,6 +237,7 @@ void thermal_zone_device_update(struct
> thermal_zone_device *);
> struct thermal_cooling_device *thermal_cooling_device_register(char *,
> void *,
> const struct thermal_cooling_device_ops *);
> void thermal_cooling_device_unregister(struct thermal_cooling_device *);
> +struct thermal_zone_device *thermal_zone_get_zone_by_name(const
> char *name);
>
> int thermal_zone_trend_get(struct thermal_zone_device *, int);
> struct thermal_instance *thermal_instance_get(struct
> thermal_zone_device *,
> --
> 1.7.7.1.488.ge8e1c
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