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Date: Mon, 1 Dec 2014 11:29:31 -0800
From: navneet kumar <navneetk@...dia.com>
To: Eduardo Valentin <edubezval@...il.com>
CC: <rui.zhang@...el.com>, <linux-pm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] thermal: of: consolidate sensor callbacks as ops
Hi Eduardo,
On 11/27/2014 06:28 AM, Eduardo Valentin wrote:
> * PGP Signed by an unknown key
>
>
> Hello Navneet,
>
> On Wed, Nov 26, 2014 at 05:16:28PM -0800, Navneet Kumar wrote:
>> From: navneet kumar <navneetk@...dia.com>
>>
>> Consolidate all the sensor callbacks (get_temp/get_trend)
>> into a 'thermal_of_sensor_ops' struct.
>>
>> As a part of this, introduce a 'thermal_zone_of_sensor_register2'
>> sensor API that accepts sensor_ops instead of the two callbacks
>> as separate arguments to the register function.
>
> This is usually not a good thing to do. Specially about the suffix
> '.*2', sounds really broken :-(. Best thing to do is to update the API
> with the improvement, and update all the users of that old API.
>
> This is one of the key Linux design decision. Please, have a look at:
> Documentation/stable_api_nonsense.txt
>
> To understand why doing such thing is a bad thing to do.
>
Thanks for correcting me. I was thinking on the lines of staging this patch as-
1. release a *register2
2. fixup rest of the drivers ( as a separate patch) to use *register2
3. rename all the references of register2 as register and eventually terminate
the use of the old signature'd API.
Either ways, i see your patch now, and will do the needful rebase too!
thanks again.
>>
>> Modify the older version of register function to call register2.
>>
>> Adjust all the references to get_temp/get_trend callbacks.
>>
>> Signed-off-by: navneet kumar <navneetk@...dia.com>
>> ---
>> drivers/thermal/of-thermal.c | 78 ++++++++++++++++++++++++++++----------------
>> include/linux/thermal.h | 14 ++++++++
>> 2 files changed, 64 insertions(+), 28 deletions(-)
>>
>> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
>> index cf9ee3e82fee..3d47a0cf3825 100644
>> --- a/drivers/thermal/of-thermal.c
>> +++ b/drivers/thermal/of-thermal.c
>> @@ -96,8 +96,7 @@ struct __thermal_zone {
>>
>> /* sensor interface */
>> void *sensor_data;
>> - int (*get_temp)(void *, long *);
>> - int (*get_trend)(void *, long *);
>> + struct thermal_of_sensor_ops sops;
>
> Have you seen this patch:
> https://git.kernel.org/cgit/linux/kernel/git/evalenti/linux-soc-thermal.git/commit/?h=linus&id=2251aef64a38db60f4ae7a4a83f9203c6791f196
>
> ?
>
> Please rebase your changes on top of my -linus branch:
> git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal.git linus
>
>
> BR,
>
> Eduardo Valentin
>> };
>>
>> /*** DT thermal zone device callbacks ***/
>> @@ -107,10 +106,10 @@ static int of_thermal_get_temp(struct thermal_zone_device *tz,
>> {
>> struct __thermal_zone *data = tz->devdata;
>>
>> - if (!data->get_temp)
>> + if (!data->sops.get_temp)
>> return -EINVAL;
>>
>> - return data->get_temp(data->sensor_data, temp);
>> + return data->sops.get_temp(data->sensor_data, temp);
>> }
>>
>> static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
>> @@ -120,10 +119,10 @@ static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
>> long dev_trend;
>> int r;
>>
>> - if (!data->get_trend)
>> + if (!data->sops.get_trend)
>> return -EINVAL;
>>
>> - r = data->get_trend(data->sensor_data, &dev_trend);
>> + r = data->sops.get_trend(data->sensor_data, &dev_trend);
>> if (r)
>> return r;
>>
>> @@ -324,8 +323,7 @@ static struct thermal_zone_device_ops of_thermal_ops = {
>> static struct thermal_zone_device *
>> thermal_zone_of_add_sensor(struct device_node *zone,
>> struct device_node *sensor, void *data,
>> - int (*get_temp)(void *, long *),
>> - int (*get_trend)(void *, long *))
>> + struct thermal_of_sensor_ops *sops)
>> {
>> struct thermal_zone_device *tzd;
>> struct __thermal_zone *tz;
>> @@ -337,8 +335,9 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>> tz = tzd->devdata;
>>
>> mutex_lock(&tzd->lock);
>> - tz->get_temp = get_temp;
>> - tz->get_trend = get_trend;
>> + if (sops)
>> + memcpy(&(tz->sops), sops, sizeof(*sops));
>> +
>> tz->sensor_data = data;
>>
>> tzd->ops->get_temp = of_thermal_get_temp;
>> @@ -349,15 +348,15 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>> }
>>
>> /**
>> - * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
>> + * thermal_zone_of_sensor_register2 - registers a sensor to a DT thermal zone
>> * @dev: a valid struct device pointer of a sensor device. Must contain
>> * a valid .of_node, for the sensor node.
>> * @sensor_id: a sensor identifier, in case the sensor IP has more
>> * than one sensors
>> * @data: a private pointer (owned by the caller) that will be passed
>> * back, when a temperature reading is needed.
>> - * @get_temp: a pointer to a function that reads the sensor temperature.
>> - * @get_trend: a pointer to a function that reads the sensor temperature trend.
>> + * @sops: handle to the sensor ops (get_temp/get_trend etc.) provided by the
>> + * sensor to OF.
>> *
>> * This function will search the list of thermal zones described in device
>> * tree and look for the zone that refer to the sensor device pointed by
>> @@ -370,21 +369,13 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>> * The thermal zone temperature trend is provided by the @get_trend function
>> * pointer. When called, it will have the private pointer @data back.
>> *
>> - * TODO:
>> - * 01 - This function must enqueue the new sensor instead of using
>> - * it as the only source of temperature values.
>> - *
>> - * 02 - There must be a way to match the sensor with all thermal zones
>> - * that refer to it.
>> - *
>> * Return: On success returns a valid struct thermal_zone_device,
>> * otherwise, it returns a corresponding ERR_PTR(). Caller must
>> * check the return value with help of IS_ERR() helper.
>> */
>> struct thermal_zone_device *
>> -thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
>> - void *data, int (*get_temp)(void *, long *),
>> - int (*get_trend)(void *, long *))
>> +thermal_zone_of_sensor_register2(struct device *dev, int sensor_id,
>> + void *data, struct thermal_of_sensor_ops *sops)
>> {
>> struct device_node *np, *child, *sensor_np;
>> struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
>> @@ -426,9 +417,8 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
>>
>> if (sensor_specs.np == sensor_np && id == sensor_id) {
>> tzd = thermal_zone_of_add_sensor(child, sensor_np,
>> - data,
>> - get_temp,
>> - get_trend);
>> + data,
>> + sops);
>> of_node_put(sensor_specs.np);
>> of_node_put(child);
>> goto exit;
>> @@ -441,6 +431,38 @@ exit:
>>
>> return tzd;
>> }
>> +EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register2);
>> +
>> +/**
>> + * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
>> + * @dev: a valid struct device pointer of a sensor device. Must contain
>> + * a valid .of_node, for the sensor node.
>> + * @sensor_id: a sensor identifier, in case the sensor IP has more
>> + * than one sensors
>> + * @data: a private pointer (owned by the caller) that will be passed
>> + * back, when a temperature reading is needed.
>> + * @get_temp: a pointer to a function that reads the sensor temperature.
>> + * @get_trend: a pointer to a function that reads the sensor temperature trend.
>> + *
>> + * This function calls thermal_zone_of_sensor_register2 after translating
>> + * the sensor callbacks into a single structi (sops).
>> + *
>> + * Return: Bubbles up the return status from thermal_zone_of_register2
>> + *
>> + */
>> +struct thermal_zone_device *
>> +thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
>> + void *data, int (*get_temp)(void *, long *),
>> + int (*get_trend)(void *, long *))
>> +{
>> + struct thermal_of_sensor_ops sops = {
>> + .get_temp = get_temp,
>> + .get_trend = get_trend,
>> + };
>> +
>> + return thermal_zone_of_sensor_register2(dev, sensor_id, data, &sops);
>> +
>> +}
>> EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
>>
>> /**
>> @@ -476,8 +498,8 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
>> tzd->ops->get_temp = NULL;
>> tzd->ops->get_trend = NULL;
>>
>> - tz->get_temp = NULL;
>> - tz->get_trend = NULL;
>> + tz->sops.get_temp = NULL;
>> + tz->sops.get_trend = NULL;
>> tz->sensor_data = NULL;
>> mutex_unlock(&tzd->lock);
>> }
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index ef90838b36a0..58341c56a01f 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -289,6 +289,11 @@ struct thermal_genl_event {
>> enum events event;
>> };
>>
>> +struct thermal_of_sensor_ops {
>> + int (*get_temp)(void *, long *);
>> + int (*get_trend)(void *, long *);
>> +};
>> +
>> /* Function declarations */
>> #ifdef CONFIG_THERMAL_OF
>> struct thermal_zone_device *
>> @@ -297,6 +302,9 @@ thermal_zone_of_sensor_register(struct device *dev, int id,
>> int (*get_trend)(void *, long *));
>> void thermal_zone_of_sensor_unregister(struct device *dev,
>> struct thermal_zone_device *tz);
>> +struct thermal_zone_device *
>> +thermal_zone_of_sensor_register2(struct device *dev, int sensor_id,
>> + void *data, struct thermal_of_sensor_ops *sops);
>> #else
>> static inline struct thermal_zone_device *
>> thermal_zone_of_sensor_register(struct device *dev, int id,
>> @@ -312,6 +320,12 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
>> {
>> }
>>
>> +static inline struct thermal_zone_device *
>> +thermal_zone_of_sensor_register2(struct device *dev, int sensor_id,
>> + void *data, struct thermal_of_sensor_ops *sops)
>> +{
>> + return NULL;
>> +}
>> #endif
>> struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
>> void *, struct thermal_zone_device_ops *,
>> --
>> 1.8.1.5
>>
>
> * Unknown Key
> * 0x7DA4E256
>
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