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Date: Thu, 20 Nov 2014 10:18:08 -0400
From: Eduardo Valentin <edubezval@...il.com>
To: Guenter Roeck <linux@...ck-us.net>,
Linux PM <linux-pm@...r.kernel.org>
Cc: Caesar Wang <caesar.wang@...k-chips.com>, Wei Ni <wni@...dia.com>,
Lukasz Majewski <l.majewski@...sung.com>,
Mikko Perttunen <mikko.perttunen@...si.fi>,
Alexandre Courbot <gnurou@...il.com>,
devicetree@...r.kernel.org, Grant Likely <grant.likely@...aro.org>,
Jean Delvare <jdelvare@...e.de>, linux-kernel@...r.kernel.org,
linux-tegra@...r.kernel.org, lm-sensors@...sensors.org,
Rob Herring <robh+dt@...nel.org>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>,
Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCHv5 1/1] thermal: of: improve of-thermal sensor
registration API
Hi Guenter,
On Thu, Nov 20, 2014 at 10:12:13AM -0400, Eduardo Valentin wrote:
> Different drivers request API extensions in of-thermal. For this reason,
> additional callbacks are required to fit the new drivers needs.
>
> The current API implementation expects the registering sensor driver
> to provide a get_temp and get_trend callbacks as function parameters.
> As the amount of callbacks is growing, this patch changes the existing
> implementation to use a .ops field to hold all the of thermal callbacks
> to sensor drivers.
>
> This patch also changes the existing of-thermal users to fit the new
> API design. No functional change is introduced in this patch.
>
> Cc: Alexandre Courbot <gnurou@...il.com>
> Cc: devicetree@...r.kernel.org
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Jean Delvare <jdelvare@...e.de>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-pm@...r.kernel.org
> Cc: linux-tegra@...r.kernel.org
> Cc: lm-sensors@...sensors.org
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Stephen Warren <swarren@...dotorg.org>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Tested-by: Mikko Perttunen <mikko.perttunen@...si.fi>
> Reviewed-by: Mikko Perttunen <mikko.perttunen@...si.fi>
> Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
> Reviewed-by: Lukasz Majewski <l.majewski@...sung.com>
> Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> ---
> drivers/hwmon/lm75.c | 9 +++--
> drivers/hwmon/ntc_thermistor.c | 6 +++-
> drivers/hwmon/tmp102.c | 6 +++-
Do you have objections if I queue this one for 3.19?
Cheers,
Eduardo Valentin
> drivers/thermal/of-thermal.c | 39 ++++++++++------------
> drivers/thermal/tegra_soctherm.c | 7 ++--
> drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 8 +++--
> include/linux/thermal.h | 24 +++++++++----
> 7 files changed, 62 insertions(+), 37 deletions(-)
> ---
> Difference from V4:
> - Corrected comment about which callbacks are currently mandatory.
> - Fixed compilation error when !CONFIG_OF_THERMAL.
> Difference from V3:
> - Keep the same behavior regarding callback checks.
> Change in behavior may be sent in a separate patch.
> Difference from V2:
> - Fix wrong assignment in tegra driver.
> Difference from V1:
> - Fix error handling when .get_trend is not provided.
>
> diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
> index d16dbb3..e7c8bf9 100644
> --- a/drivers/hwmon/lm75.c
> +++ b/drivers/hwmon/lm75.c
> @@ -176,6 +176,10 @@ static struct attribute *lm75_attrs[] = {
> };
> ATTRIBUTE_GROUPS(lm75);
>
> +static const struct thermal_zone_of_device_ops lm75_of_thermal_ops = {
> + .get_temp = lm75_read_temp,
> +};
> +
> /*-----------------------------------------------------------------------*/
>
> /* device probe and removal */
> @@ -291,10 +295,9 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
> if (IS_ERR(data->hwmon_dev))
> return PTR_ERR(data->hwmon_dev);
>
> - data->tz = thermal_zone_of_sensor_register(data->hwmon_dev,
> - 0,
> + data->tz = thermal_zone_of_sensor_register(data->hwmon_dev, 0,
> data->hwmon_dev,
> - lm75_read_temp, NULL);
> + &lm75_of_thermal_ops);
> if (IS_ERR(data->tz))
> data->tz = NULL;
>
> diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
> index 4ff89b2..bca8521c8 100644
> --- a/drivers/hwmon/ntc_thermistor.c
> +++ b/drivers/hwmon/ntc_thermistor.c
> @@ -486,6 +486,10 @@ static const struct attribute_group ntc_attr_group = {
> .attrs = ntc_attributes,
> };
>
> +static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = {
> + .get_temp = ntc_read_temp,
> +};
> +
> static int ntc_thermistor_probe(struct platform_device *pdev)
> {
> const struct of_device_id *of_id =
> @@ -579,7 +583,7 @@ static int ntc_thermistor_probe(struct platform_device *pdev)
> pdev_id->name);
>
> data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev,
> - ntc_read_temp, NULL);
> + &ntc_of_thermal_ops);
> if (IS_ERR(data->tz)) {
> dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n");
> data->tz = NULL;
> diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
> index 5171995..ba9f478 100644
> --- a/drivers/hwmon/tmp102.c
> +++ b/drivers/hwmon/tmp102.c
> @@ -158,6 +158,10 @@ ATTRIBUTE_GROUPS(tmp102);
> #define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
> #define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
>
> +static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = {
> + .get_temp = tmp102_read_temp,
> +};
> +
> static int tmp102_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -215,7 +219,7 @@ static int tmp102_probe(struct i2c_client *client,
> }
> tmp102->hwmon_dev = hwmon_dev;
> tmp102->tz = thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
> - tmp102_read_temp, NULL);
> + &tmp102_of_thermal_ops);
> if (IS_ERR(tmp102->tz))
> tmp102->tz = NULL;
>
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index f8eb625..b6e7a26 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -30,6 +30,7 @@
> #include <linux/err.h>
> #include <linux/export.h>
> #include <linux/string.h>
> +#include <linux/thermal.h>
>
> #include "thermal_core.h"
>
> @@ -77,8 +78,7 @@ struct __thermal_bind_params {
> * @num_tbps: number of thermal bind params
> * @tbps: an array of thermal bind params (0..num_tbps - 1)
> * @sensor_data: sensor private data used while reading temperature and trend
> - * @get_temp: sensor callback to read temperature
> - * @get_trend: sensor callback to read temperature trend
> + * @ops: set of callbacks to handle the thermal zone based on DT
> */
>
> struct __thermal_zone {
> @@ -96,8 +96,7 @@ struct __thermal_zone {
>
> /* sensor interface */
> void *sensor_data;
> - int (*get_temp)(void *, long *);
> - int (*get_trend)(void *, long *);
> + const struct thermal_zone_of_device_ops *ops;
> };
>
> /*** 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->ops->get_temp)
> return -EINVAL;
>
> - return data->get_temp(data->sensor_data, temp);
> + return data->ops->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->ops->get_trend)
> return -EINVAL;
>
> - r = data->get_trend(data->sensor_data, &dev_trend);
> + r = data->ops->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 *))
> + const struct thermal_zone_of_device_ops *ops)
> {
> struct thermal_zone_device *tzd;
> struct __thermal_zone *tz;
> @@ -336,9 +334,11 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>
> tz = tzd->devdata;
>
> + if (!ops)
> + return ERR_PTR(-EINVAL);
> +
> mutex_lock(&tzd->lock);
> - tz->get_temp = get_temp;
> - tz->get_trend = get_trend;
> + tz->ops = ops;
> tz->sensor_data = data;
>
> tzd->ops->get_temp = of_thermal_get_temp;
> @@ -356,8 +356,7 @@ thermal_zone_of_add_sensor(struct device_node *zone,
> * 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.
> + * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
> *
> * 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
> @@ -382,9 +381,8 @@ thermal_zone_of_add_sensor(struct device_node *zone,
> * 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_register(struct device *dev, int sensor_id, void *data,
> + const struct thermal_zone_of_device_ops *ops)
> {
> struct device_node *np, *child, *sensor_np;
>
> @@ -424,9 +422,7 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
> if (sensor_specs.np == sensor_np && id == sensor_id) {
> of_node_put(np);
> return thermal_zone_of_add_sensor(child, sensor_np,
> - data,
> - get_temp,
> - get_trend);
> + data, ops);
> }
> }
> of_node_put(np);
> @@ -468,8 +464,7 @@ 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->ops = NULL;
> tz->sensor_data = NULL;
> mutex_unlock(&tzd->lock);
> }
> diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c
> index 70f7e9e..9197fc0 100644
> --- a/drivers/thermal/tegra_soctherm.c
> +++ b/drivers/thermal/tegra_soctherm.c
> @@ -317,6 +317,10 @@ static int tegra_thermctl_get_temp(void *data, long *out_temp)
> return 0;
> }
>
> +static const struct thermal_zone_of_device_ops tegra_of_thermal_ops = {
> + .get_temp = tegra_thermctl_get_temp,
> +};
> +
> static const struct of_device_id tegra_soctherm_of_match[] = {
> { .compatible = "nvidia,tegra124-soctherm" },
> { },
> @@ -416,8 +420,7 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
> zone->shift = t124_thermctl_temp_zones[i].shift;
>
> tz = thermal_zone_of_sensor_register(&pdev->dev, i, zone,
> - tegra_thermctl_get_temp,
> - NULL);
> + &tegra_of_thermal_ops);
> if (IS_ERR(tz)) {
> err = PTR_ERR(tz);
> dev_err(&pdev->dev, "failed to register sensor: %d\n",
> diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> index 9eec26d..5fd0386 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> @@ -286,6 +286,11 @@ static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
> return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
> }
>
> +static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
> + .get_temp = __ti_thermal_get_temp,
> + .get_trend = __ti_thermal_get_trend,
> +};
> +
> static struct thermal_zone_device_ops ti_thermal_ops = {
> .get_temp = ti_thermal_get_temp,
> .get_trend = ti_thermal_get_trend,
> @@ -333,8 +338,7 @@ int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
>
> /* in case this is specified by DT */
> data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
> - data, __ti_thermal_get_temp,
> - __ti_thermal_get_trend);
> + data, &ti_of_thermal_ops);
> if (IS_ERR(data->ti_thermal)) {
> /* Create thermal zone */
> data->ti_thermal = thermal_zone_device_register(domain,
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index ef90838..5bc28a7 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -289,19 +289,31 @@ struct thermal_genl_event {
> enum events event;
> };
>
> +/**
> + * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
> + *
> + * Mandatory:
> + * @get_temp: a pointer to a function that reads the sensor temperature.
> + *
> + * Optional:
> + * @get_trend: a pointer to a function that reads the sensor temperature trend.
> + */
> +struct thermal_zone_of_device_ops {
> + int (*get_temp)(void *, long *);
> + int (*get_trend)(void *, long *);
> +};
> +
> /* Function declarations */
> #ifdef CONFIG_THERMAL_OF
> struct thermal_zone_device *
> -thermal_zone_of_sensor_register(struct device *dev, int id,
> - void *data, int (*get_temp)(void *, long *),
> - int (*get_trend)(void *, long *));
> +thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
> + const struct thermal_zone_of_device_ops *ops);
> void thermal_zone_of_sensor_unregister(struct device *dev,
> struct thermal_zone_device *tz);
> #else
> static inline struct thermal_zone_device *
> -thermal_zone_of_sensor_register(struct device *dev, int id,
> - void *data, int (*get_temp)(void *, long *),
> - int (*get_trend)(void *, long *))
> +thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
> + const struct thermal_zone_of_device_ops *ops)
> {
> return NULL;
> }
> --
> 2.1.3
>
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