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Message-ID: <CADGdYn5B3UHCVQ0LVqPp1aOptmxWy4tAtW9R-M3GW56pMiCmzQ@mail.gmail.com>
Date: Wed, 8 May 2013 09:19:28 +0530
From: amit daniel kachhap <amit.daniel@...sung.com>
To: Zhang Rui <rui.zhang@...el.com>
Cc: linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, Kukjin Kim <kgene.kim@...sung.com>,
Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH V3 02/21] thermal: exynos: Bifurcate exynos thermal common
and tmu controller code
Hi Rui,
On Tue, May 7, 2013 at 7:11 PM, Zhang Rui <rui.zhang@...el.com> wrote:
> On Tue, 2013-05-07 at 18:30 +0530, Amit Daniel Kachhap wrote:
>> This code bifurcates exynos thermal implementation into common and sensor
>> specific parts. The common thermal code interacts with core thermal layer and
>> core cpufreq cooling parts and is independent of SOC specific driver. This
>> change is needed to cleanly add support for new TMU sensors.
>>
>> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> ---
>> drivers/thermal/samsung/Kconfig | 20 +-
>> drivers/thermal/samsung/Makefile | 4 +-
>> drivers/thermal/samsung/exynos_thermal.c | 421 +----------------------
>> drivers/thermal/samsung/exynos_thermal_common.c | 389 +++++++++++++++++++++
>> drivers/thermal/samsung/exynos_thermal_common.h | 83 +++++
>> 5 files changed, 498 insertions(+), 419 deletions(-)
>> create mode 100644 drivers/thermal/samsung/exynos_thermal_common.c
>> create mode 100644 drivers/thermal/samsung/exynos_thermal_common.h
>>
>> diff --git a/drivers/thermal/samsung/Kconfig b/drivers/thermal/samsung/Kconfig
>> index 2d3d9dc..7857e20 100644
>> --- a/drivers/thermal/samsung/Kconfig
>> +++ b/drivers/thermal/samsung/Kconfig
>> @@ -1,9 +1,17 @@
>> config EXYNOS_THERMAL
>> - tristate "Temperature sensor on Samsung EXYNOS"
>> + tristate "Exynos thermal management unit driver"
>> depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5)
>> - depends on CPU_THERMAL
>> help
>> - If you say yes here you get support for TMU (Thermal Management
>> - Unit) on SAMSUNG EXYNOS series of SoC. This helps in registering
>> - the exynos thermal driver with the core thermal layer and cpu
>> - cooling API's.
>> + If you say yes here you get support for the exynos thermal driver
>> + for exynos4 and exynos5 soc. This driver initialises the TMU, reports
>> + temperature and handles cooling action if defined. This driver uses
>> + core thermal API's.
>> +
>> +config EXYNOS_THERMAL_CORE
>> + bool "Core thermal framework support for EXYNOS SOC's"
>> + depends on EXYNOS_THERMAL
>> + help
>> + If you say yes here you get support for EXYNOS TMU
>> + (Thermal Management Unit) common registration/unregistration
>> + functions to the core thermal layer and also to use the generic
>> + cpu cooling API's.
>
> I'm still not quite clear what you want to get there.
> If EXYNOS_THERMAL=y and EXYNOS_THERMAL_CORE=n, you'll get an Exynos tmu
> driver which is not shown in /sys/class/thermal/ and can not be used for
> thermal management?
Yes I understood your point.
I have kept separate config entry EXYNOS_THERMAL_CORE to make it
scalable. Say a totally different TMU controller comes which is not
possible to fit in the current exynos_tmu.c file and new file might be
needed but still this new thermal controller can use the thermal core
file. Even for 5440 I had hard time integrating the thermal driver as
it is quite different from the existing driver.
In the current scenario even though EXYNOS_THERMAL_CORE=n, TMU h/w is
initialised and there are other mechanisms to read the temperature
like I2C based but yes as you said full thermal management is not
possible.
Regards,
Amit Daniel
>
> thanks,
> rui
>> diff --git a/drivers/thermal/samsung/Makefile b/drivers/thermal/samsung/Makefile
>> index 1fe6d93..6227d4f 100644
>> --- a/drivers/thermal/samsung/Makefile
>> +++ b/drivers/thermal/samsung/Makefile
>> @@ -1,4 +1,6 @@
>> #
>> # Samsung thermal specific Makefile
>> #
>> -obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
>> +obj-$(CONFIG_EXYNOS_THERMAL) += exynos_soc_thermal.o
>> +exynos_soc_thermal-y := exynos_thermal.o
>> +exynos_soc_thermal-$(CONFIG_EXYNOS_THERMAL_CORE) += exynos_thermal_common.o
>> diff --git a/drivers/thermal/samsung/exynos_thermal.c b/drivers/thermal/samsung/exynos_thermal.c
>> index d20ce9e..4c85945 100644
>> --- a/drivers/thermal/samsung/exynos_thermal.c
>> +++ b/drivers/thermal/samsung/exynos_thermal.c
>> @@ -21,23 +21,19 @@
>> *
>> */
>>
>> -#include <linux/module.h>
>> -#include <linux/err.h>
>> -#include <linux/kernel.h>
>> -#include <linux/slab.h>
>> -#include <linux/platform_device.h>
>> -#include <linux/interrupt.h>
>> #include <linux/clk.h>
>> -#include <linux/workqueue.h>
>> -#include <linux/sysfs.h>
>> -#include <linux/kobject.h>
>> #include <linux/io.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/kernel.h>
>> +#include <linux/kobject.h>
>> +#include <linux/module.h>
>> #include <linux/mutex.h>
>> -#include <linux/platform_data/exynos_thermal.h>
>> -#include <linux/thermal.h>
>> -#include <linux/cpufreq.h>
>> -#include <linux/cpu_cooling.h>
>> #include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/platform_data/exynos_thermal.h>
>> +#include <linux/slab.h>
>> +#include <linux/workqueue.h>
>> +#include "exynos_thermal_common.h"
>>
>> /* Exynos generic registers */
>> #define EXYNOS_TMU_REG_TRIMINFO 0x0
>> @@ -88,16 +84,6 @@
>> #define EFUSE_MIN_VALUE 40
>> #define EFUSE_MAX_VALUE 100
>>
>> -/* In-kernel thermal framework related macros & definations */
>> -#define SENSOR_NAME_LEN 16
>> -#define MAX_TRIP_COUNT 8
>> -#define MAX_COOLING_DEVICE 4
>> -#define MAX_THRESHOLD_LEVS 4
>> -
>> -#define ACTIVE_INTERVAL 500
>> -#define IDLE_INTERVAL 10000
>> -#define MCELSIUS 1000
>> -
>> #ifdef CONFIG_THERMAL_EMULATION
>> #define EXYNOS_EMUL_TIME 0x57F0
>> #define EXYNOS_EMUL_TIME_SHIFT 16
>> @@ -106,17 +92,6 @@
>> #define EXYNOS_EMUL_ENABLE 0x1
>> #endif /* CONFIG_THERMAL_EMULATION */
>>
>> -/* CPU Zone information */
>> -#define PANIC_ZONE 4
>> -#define WARN_ZONE 3
>> -#define MONITOR_ZONE 2
>> -#define SAFE_ZONE 1
>> -
>> -#define GET_ZONE(trip) (trip + 2)
>> -#define GET_TRIP(zone) (zone - 2)
>> -
>> -#define EXYNOS_ZONE_COUNT 3
>> -
>> struct exynos_tmu_data {
>> struct exynos_tmu_platform_data *pdata;
>> struct resource *mem;
>> @@ -129,384 +104,6 @@ struct exynos_tmu_data {
>> u8 temp_error1, temp_error2;
>> };
>>
>> -struct thermal_trip_point_conf {
>> - int trip_val[MAX_TRIP_COUNT];
>> - int trip_count;
>> - u8 trigger_falling;
>> -};
>> -
>> -struct thermal_cooling_conf {
>> - struct freq_clip_table freq_data[MAX_TRIP_COUNT];
>> - int freq_clip_count;
>> -};
>> -
>> -struct thermal_sensor_conf {
>> - char name[SENSOR_NAME_LEN];
>> - int (*read_temperature)(void *data);
>> - int (*write_emul_temp)(void *drv_data, unsigned long temp);
>> - struct thermal_trip_point_conf trip_data;
>> - struct thermal_cooling_conf cooling_data;
>> - void *private_data;
>> -};
>> -
>> -struct exynos_thermal_zone {
>> - enum thermal_device_mode mode;
>> - struct thermal_zone_device *therm_dev;
>> - struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
>> - unsigned int cool_dev_size;
>> - struct platform_device *exynos4_dev;
>> - struct thermal_sensor_conf *sensor_conf;
>> - bool bind;
>> -};
>> -
>> -static struct exynos_thermal_zone *th_zone;
>> -static void exynos_unregister_thermal(void);
>> -static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);
>> -
>> -/* Get mode callback functions for thermal zone */
>> -static int exynos_get_mode(struct thermal_zone_device *thermal,
>> - enum thermal_device_mode *mode)
>> -{
>> - if (th_zone)
>> - *mode = th_zone->mode;
>> - return 0;
>> -}
>> -
>> -/* Set mode callback functions for thermal zone */
>> -static int exynos_set_mode(struct thermal_zone_device *thermal,
>> - enum thermal_device_mode mode)
>> -{
>> - if (!th_zone->therm_dev) {
>> - pr_notice("thermal zone not registered\n");
>> - return 0;
>> - }
>> -
>> - mutex_lock(&th_zone->therm_dev->lock);
>> -
>> - if (mode == THERMAL_DEVICE_ENABLED &&
>> - !th_zone->sensor_conf->trip_data.trigger_falling)
>> - th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
>> - else
>> - th_zone->therm_dev->polling_delay = 0;
>> -
>> - mutex_unlock(&th_zone->therm_dev->lock);
>> -
>> - th_zone->mode = mode;
>> - thermal_zone_device_update(th_zone->therm_dev);
>> - pr_info("thermal polling set for duration=%d msec\n",
>> - th_zone->therm_dev->polling_delay);
>> - return 0;
>> -}
>> -
>> -
>> -/* Get trip type callback functions for thermal zone */
>> -static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
>> - enum thermal_trip_type *type)
>> -{
>> - switch (GET_ZONE(trip)) {
>> - case MONITOR_ZONE:
>> - case WARN_ZONE:
>> - *type = THERMAL_TRIP_ACTIVE;
>> - break;
>> - case PANIC_ZONE:
>> - *type = THERMAL_TRIP_CRITICAL;
>> - break;
>> - default:
>> - return -EINVAL;
>> - }
>> - return 0;
>> -}
>> -
>> -/* Get trip temperature callback functions for thermal zone */
>> -static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
>> - unsigned long *temp)
>> -{
>> - if (trip < GET_TRIP(MONITOR_ZONE) || trip > GET_TRIP(PANIC_ZONE))
>> - return -EINVAL;
>> -
>> - *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
>> - /* convert the temperature into millicelsius */
>> - *temp = *temp * MCELSIUS;
>> -
>> - return 0;
>> -}
>> -
>> -/* Get critical temperature callback functions for thermal zone */
>> -static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
>> - unsigned long *temp)
>> -{
>> - int ret;
>> - /* Panic zone */
>> - ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
>> - return ret;
>> -}
>> -
>> -/* Bind callback functions for thermal zone */
>> -static int exynos_bind(struct thermal_zone_device *thermal,
>> - struct thermal_cooling_device *cdev)
>> -{
>> - int ret = 0, i, tab_size, level;
>> - struct freq_clip_table *tab_ptr, *clip_data;
>> - struct thermal_sensor_conf *data = th_zone->sensor_conf;
>> -
>> - tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
>> - tab_size = data->cooling_data.freq_clip_count;
>> -
>> - if (tab_ptr == NULL || tab_size == 0)
>> - return -EINVAL;
>> -
>> - /* find the cooling device registered*/
>> - for (i = 0; i < th_zone->cool_dev_size; i++)
>> - if (cdev == th_zone->cool_dev[i])
>> - break;
>> -
>> - /* No matching cooling device */
>> - if (i == th_zone->cool_dev_size)
>> - return 0;
>> -
>> - /* Bind the thermal zone to the cpufreq cooling device */
>> - for (i = 0; i < tab_size; i++) {
>> - clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
>> - level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
>> - if (level == THERMAL_CSTATE_INVALID)
>> - return 0;
>> - switch (GET_ZONE(i)) {
>> - case MONITOR_ZONE:
>> - case WARN_ZONE:
>> - if (thermal_zone_bind_cooling_device(thermal, i, cdev,
>> - level, 0)) {
>> - pr_err("error binding cdev inst %d\n", i);
>> - ret = -EINVAL;
>> - }
>> - th_zone->bind = true;
>> - break;
>> - default:
>> - ret = -EINVAL;
>> - }
>> - }
>> -
>> - return ret;
>> -}
>> -
>> -/* Unbind callback functions for thermal zone */
>> -static int exynos_unbind(struct thermal_zone_device *thermal,
>> - struct thermal_cooling_device *cdev)
>> -{
>> - int ret = 0, i, tab_size;
>> - struct thermal_sensor_conf *data = th_zone->sensor_conf;
>> -
>> - if (th_zone->bind == false)
>> - return 0;
>> -
>> - tab_size = data->cooling_data.freq_clip_count;
>> -
>> - if (tab_size == 0)
>> - return -EINVAL;
>> -
>> - /* find the cooling device registered*/
>> - for (i = 0; i < th_zone->cool_dev_size; i++)
>> - if (cdev == th_zone->cool_dev[i])
>> - break;
>> -
>> - /* No matching cooling device */
>> - if (i == th_zone->cool_dev_size)
>> - return 0;
>> -
>> - /* Bind the thermal zone to the cpufreq cooling device */
>> - for (i = 0; i < tab_size; i++) {
>> - switch (GET_ZONE(i)) {
>> - case MONITOR_ZONE:
>> - case WARN_ZONE:
>> - if (thermal_zone_unbind_cooling_device(thermal, i,
>> - cdev)) {
>> - pr_err("error unbinding cdev inst=%d\n", i);
>> - ret = -EINVAL;
>> - }
>> - th_zone->bind = false;
>> - break;
>> - default:
>> - ret = -EINVAL;
>> - }
>> - }
>> - return ret;
>> -}
>> -
>> -/* Get temperature callback functions for thermal zone */
>> -static int exynos_get_temp(struct thermal_zone_device *thermal,
>> - unsigned long *temp)
>> -{
>> - void *data;
>> -
>> - if (!th_zone->sensor_conf) {
>> - pr_info("Temperature sensor not initialised\n");
>> - return -EINVAL;
>> - }
>> - data = th_zone->sensor_conf->private_data;
>> - *temp = th_zone->sensor_conf->read_temperature(data);
>> - /* convert the temperature into millicelsius */
>> - *temp = *temp * MCELSIUS;
>> - return 0;
>> -}
>> -
>> -/* Get temperature callback functions for thermal zone */
>> -static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
>> - unsigned long temp)
>> -{
>> - void *data;
>> - int ret = -EINVAL;
>> -
>> - if (!th_zone->sensor_conf) {
>> - pr_info("Temperature sensor not initialised\n");
>> - return -EINVAL;
>> - }
>> - data = th_zone->sensor_conf->private_data;
>> - if (th_zone->sensor_conf->write_emul_temp)
>> - ret = th_zone->sensor_conf->write_emul_temp(data, temp);
>> - return ret;
>> -}
>> -
>> -/* Get the temperature trend */
>> -static int exynos_get_trend(struct thermal_zone_device *thermal,
>> - int trip, enum thermal_trend *trend)
>> -{
>> - int ret;
>> - unsigned long trip_temp;
>> -
>> - ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
>> - if (ret < 0)
>> - return ret;
>> -
>> - if (thermal->temperature >= trip_temp)
>> - *trend = THERMAL_TREND_RAISE_FULL;
>> - else
>> - *trend = THERMAL_TREND_DROP_FULL;
>> -
>> - return 0;
>> -}
>> -/* Operation callback functions for thermal zone */
>> -static struct thermal_zone_device_ops const exynos_dev_ops = {
>> - .bind = exynos_bind,
>> - .unbind = exynos_unbind,
>> - .get_temp = exynos_get_temp,
>> - .set_emul_temp = exynos_set_emul_temp,
>> - .get_trend = exynos_get_trend,
>> - .get_mode = exynos_get_mode,
>> - .set_mode = exynos_set_mode,
>> - .get_trip_type = exynos_get_trip_type,
>> - .get_trip_temp = exynos_get_trip_temp,
>> - .get_crit_temp = exynos_get_crit_temp,
>> -};
>> -
>> -/*
>> - * This function may be called from interrupt based temperature sensor
>> - * when threshold is changed.
>> - */
>> -static void exynos_report_trigger(void)
>> -{
>> - unsigned int i;
>> - char data[10];
>> - char *envp[] = { data, NULL };
>> -
>> - if (!th_zone || !th_zone->therm_dev)
>> - return;
>> - if (th_zone->bind == false) {
>> - for (i = 0; i < th_zone->cool_dev_size; i++) {
>> - if (!th_zone->cool_dev[i])
>> - continue;
>> - exynos_bind(th_zone->therm_dev,
>> - th_zone->cool_dev[i]);
>> - }
>> - }
>> -
>> - thermal_zone_device_update(th_zone->therm_dev);
>> -
>> - mutex_lock(&th_zone->therm_dev->lock);
>> - /* Find the level for which trip happened */
>> - for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
>> - if (th_zone->therm_dev->last_temperature <
>> - th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
>> - break;
>> - }
>> -
>> - if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
>> - !th_zone->sensor_conf->trip_data.trigger_falling) {
>> - if (i > 0)
>> - th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
>> - else
>> - th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
>> - }
>> -
>> - snprintf(data, sizeof(data), "%u", i);
>> - kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
>> - mutex_unlock(&th_zone->therm_dev->lock);
>> -}
>> -
>> -/* Register with the in-kernel thermal management */
>> -static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
>> -{
>> - int ret;
>> - struct cpumask mask_val;
>> -
>> - if (!sensor_conf || !sensor_conf->read_temperature) {
>> - pr_err("Temperature sensor not initialised\n");
>> - return -EINVAL;
>> - }
>> -
>> - th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
>> - if (!th_zone)
>> - return -ENOMEM;
>> -
>> - th_zone->sensor_conf = sensor_conf;
>> - cpumask_set_cpu(0, &mask_val);
>> - th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
>> - if (IS_ERR(th_zone->cool_dev[0])) {
>> - pr_err("Failed to register cpufreq cooling device\n");
>> - ret = -EINVAL;
>> - goto err_unregister;
>> - }
>> - th_zone->cool_dev_size++;
>> -
>> - th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
>> - EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
>> - sensor_conf->trip_data.trigger_falling ?
>> - 0 : IDLE_INTERVAL);
>> -
>> - if (IS_ERR(th_zone->therm_dev)) {
>> - pr_err("Failed to register thermal zone device\n");
>> - ret = PTR_ERR(th_zone->therm_dev);
>> - goto err_unregister;
>> - }
>> - th_zone->mode = THERMAL_DEVICE_ENABLED;
>> -
>> - pr_info("Exynos: Kernel Thermal management registered\n");
>> -
>> - return 0;
>> -
>> -err_unregister:
>> - exynos_unregister_thermal();
>> - return ret;
>> -}
>> -
>> -/* Un-Register with the in-kernel thermal management */
>> -static void exynos_unregister_thermal(void)
>> -{
>> - int i;
>> -
>> - if (!th_zone)
>> - return;
>> -
>> - if (th_zone->therm_dev)
>> - thermal_zone_device_unregister(th_zone->therm_dev);
>> -
>> - for (i = 0; i < th_zone->cool_dev_size; i++) {
>> - if (th_zone->cool_dev[i])
>> - cpufreq_cooling_unregister(th_zone->cool_dev[i]);
>> - }
>> -
>> - kfree(th_zone);
>> - pr_info("Exynos: Kernel Thermal management unregistered\n");
>> -}
>> -
>> /*
>> * TMU treats temperature as a mapped temperature code.
>> * The temperature is converted differently depending on the calibration type.
>> diff --git a/drivers/thermal/samsung/exynos_thermal_common.c b/drivers/thermal/samsung/exynos_thermal_common.c
>> new file mode 100644
>> index 0000000..9a57606
>> --- /dev/null
>> +++ b/drivers/thermal/samsung/exynos_thermal_common.c
>> @@ -0,0 +1,389 @@
>> +/*
>> + * exynos_thermal_common.c - Samsung EXYNOS common thermal file
>> + *
>> + * Copyright (C) 2013 Samsung Electronics
>> + * Amit Daniel Kachhap <amit.daniel@...sung.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
>> + *
>> + */
>> +
>> +#include <linux/cpufreq.h>
>> +#include <linux/cpu_cooling.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/kobject.h>
>> +#include <linux/mutex.h>
>> +#include <linux/platform_data/exynos_thermal.h>
>> +#include <linux/slab.h>
>> +#include <linux/thermal.h>
>> +#include "exynos_thermal_common.h"
>> +
>> +struct exynos_thermal_zone {
>> + enum thermal_device_mode mode;
>> + struct thermal_zone_device *therm_dev;
>> + struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
>> + unsigned int cool_dev_size;
>> + struct platform_device *exynos4_dev;
>> + struct thermal_sensor_conf *sensor_conf;
>> + bool bind;
>> +};
>> +
>> +static struct exynos_thermal_zone *th_zone;
>> +
>> +/* Get mode callback functions for thermal zone */
>> +static int exynos_get_mode(struct thermal_zone_device *thermal,
>> + enum thermal_device_mode *mode)
>> +{
>> + if (th_zone)
>> + *mode = th_zone->mode;
>> + return 0;
>> +}
>> +
>> +/* Set mode callback functions for thermal zone */
>> +static int exynos_set_mode(struct thermal_zone_device *thermal,
>> + enum thermal_device_mode mode)
>> +{
>> + if (!th_zone->therm_dev) {
>> + pr_notice("thermal zone not registered\n");
>> + return 0;
>> + }
>> +
>> + mutex_lock(&th_zone->therm_dev->lock);
>> +
>> + if (mode == THERMAL_DEVICE_ENABLED &&
>> + !th_zone->sensor_conf->trip_data.trigger_falling)
>> + th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
>> + else
>> + th_zone->therm_dev->polling_delay = 0;
>> +
>> + mutex_unlock(&th_zone->therm_dev->lock);
>> +
>> + th_zone->mode = mode;
>> + thermal_zone_device_update(th_zone->therm_dev);
>> + pr_info("thermal polling set for duration=%d msec\n",
>> + th_zone->therm_dev->polling_delay);
>> + return 0;
>> +}
>> +
>> +
>> +/* Get trip type callback functions for thermal zone */
>> +static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
>> + enum thermal_trip_type *type)
>> +{
>> + switch (GET_ZONE(trip)) {
>> + case MONITOR_ZONE:
>> + case WARN_ZONE:
>> + *type = THERMAL_TRIP_ACTIVE;
>> + break;
>> + case PANIC_ZONE:
>> + *type = THERMAL_TRIP_CRITICAL;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + return 0;
>> +}
>> +
>> +/* Get trip temperature callback functions for thermal zone */
>> +static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
>> + unsigned long *temp)
>> +{
>> + if (trip < GET_TRIP(MONITOR_ZONE) || trip > GET_TRIP(PANIC_ZONE))
>> + return -EINVAL;
>> +
>> + *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
>> + /* convert the temperature into millicelsius */
>> + *temp = *temp * MCELSIUS;
>> +
>> + return 0;
>> +}
>> +
>> +/* Get critical temperature callback functions for thermal zone */
>> +static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
>> + unsigned long *temp)
>> +{
>> + int ret;
>> + /* Panic zone */
>> + ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
>> + return ret;
>> +}
>> +
>> +/* Bind callback functions for thermal zone */
>> +static int exynos_bind(struct thermal_zone_device *thermal,
>> + struct thermal_cooling_device *cdev)
>> +{
>> + int ret = 0, i, tab_size, level;
>> + struct freq_clip_table *tab_ptr, *clip_data;
>> + struct thermal_sensor_conf *data = th_zone->sensor_conf;
>> +
>> + tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
>> + tab_size = data->cooling_data.freq_clip_count;
>> +
>> + if (tab_ptr == NULL || tab_size == 0)
>> + return -EINVAL;
>> +
>> + /* find the cooling device registered*/
>> + for (i = 0; i < th_zone->cool_dev_size; i++)
>> + if (cdev == th_zone->cool_dev[i])
>> + break;
>> +
>> + /* No matching cooling device */
>> + if (i == th_zone->cool_dev_size)
>> + return 0;
>> +
>> + /* Bind the thermal zone to the cpufreq cooling device */
>> + for (i = 0; i < tab_size; i++) {
>> + clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
>> + level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
>> + if (level == THERMAL_CSTATE_INVALID)
>> + return 0;
>> + switch (GET_ZONE(i)) {
>> + case MONITOR_ZONE:
>> + case WARN_ZONE:
>> + if (thermal_zone_bind_cooling_device(thermal, i, cdev,
>> + level, 0)) {
>> + pr_err("error binding cdev inst %d\n", i);
>> + ret = -EINVAL;
>> + }
>> + th_zone->bind = true;
>> + break;
>> + default:
>> + ret = -EINVAL;
>> + }
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +/* Unbind callback functions for thermal zone */
>> +static int exynos_unbind(struct thermal_zone_device *thermal,
>> + struct thermal_cooling_device *cdev)
>> +{
>> + int ret = 0, i, tab_size;
>> + struct thermal_sensor_conf *data = th_zone->sensor_conf;
>> +
>> + if (th_zone->bind == false)
>> + return 0;
>> +
>> + tab_size = data->cooling_data.freq_clip_count;
>> +
>> + if (tab_size == 0)
>> + return -EINVAL;
>> +
>> + /* find the cooling device registered*/
>> + for (i = 0; i < th_zone->cool_dev_size; i++)
>> + if (cdev == th_zone->cool_dev[i])
>> + break;
>> +
>> + /* No matching cooling device */
>> + if (i == th_zone->cool_dev_size)
>> + return 0;
>> +
>> + /* Bind the thermal zone to the cpufreq cooling device */
>> + for (i = 0; i < tab_size; i++) {
>> + switch (GET_ZONE(i)) {
>> + case MONITOR_ZONE:
>> + case WARN_ZONE:
>> + if (thermal_zone_unbind_cooling_device(thermal, i,
>> + cdev)) {
>> + pr_err("error unbinding cdev inst=%d\n", i);
>> + ret = -EINVAL;
>> + }
>> + th_zone->bind = false;
>> + break;
>> + default:
>> + ret = -EINVAL;
>> + }
>> + }
>> + return ret;
>> +}
>> +
>> +/* Get temperature callback functions for thermal zone */
>> +static int exynos_get_temp(struct thermal_zone_device *thermal,
>> + unsigned long *temp)
>> +{
>> + void *data;
>> +
>> + if (!th_zone->sensor_conf) {
>> + pr_info("Temperature sensor not initialised\n");
>> + return -EINVAL;
>> + }
>> + data = th_zone->sensor_conf->private_data;
>> + *temp = th_zone->sensor_conf->read_temperature(data);
>> + /* convert the temperature into millicelsius */
>> + *temp = *temp * MCELSIUS;
>> + return 0;
>> +}
>> +
>> +/* Get temperature callback functions for thermal zone */
>> +static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
>> + unsigned long temp)
>> +{
>> + void *data;
>> + int ret = -EINVAL;
>> +
>> + if (!th_zone->sensor_conf) {
>> + pr_info("Temperature sensor not initialised\n");
>> + return -EINVAL;
>> + }
>> + data = th_zone->sensor_conf->private_data;
>> + if (th_zone->sensor_conf->write_emul_temp)
>> + ret = th_zone->sensor_conf->write_emul_temp(data, temp);
>> + return ret;
>> +}
>> +
>> +/* Get the temperature trend */
>> +static int exynos_get_trend(struct thermal_zone_device *thermal,
>> + int trip, enum thermal_trend *trend)
>> +{
>> + int ret;
>> + unsigned long trip_temp;
>> +
>> + ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
>> + if (ret < 0)
>> + return ret;
>> +
>> + if (thermal->temperature >= trip_temp)
>> + *trend = THERMAL_TREND_RAISE_FULL;
>> + else
>> + *trend = THERMAL_TREND_DROP_FULL;
>> +
>> + return 0;
>> +}
>> +/* Operation callback functions for thermal zone */
>> +static struct thermal_zone_device_ops const exynos_dev_ops = {
>> + .bind = exynos_bind,
>> + .unbind = exynos_unbind,
>> + .get_temp = exynos_get_temp,
>> + .set_emul_temp = exynos_set_emul_temp,
>> + .get_trend = exynos_get_trend,
>> + .get_mode = exynos_get_mode,
>> + .set_mode = exynos_set_mode,
>> + .get_trip_type = exynos_get_trip_type,
>> + .get_trip_temp = exynos_get_trip_temp,
>> + .get_crit_temp = exynos_get_crit_temp,
>> +};
>> +
>> +/*
>> + * This function may be called from interrupt based temperature sensor
>> + * when threshold is changed.
>> + */
>> +void exynos_report_trigger(void)
>> +{
>> + unsigned int i;
>> + char data[10];
>> + char *envp[] = { data, NULL };
>> +
>> + if (!th_zone || !th_zone->therm_dev)
>> + return;
>> + if (th_zone->bind == false) {
>> + for (i = 0; i < th_zone->cool_dev_size; i++) {
>> + if (!th_zone->cool_dev[i])
>> + continue;
>> + exynos_bind(th_zone->therm_dev,
>> + th_zone->cool_dev[i]);
>> + }
>> + }
>> +
>> + thermal_zone_device_update(th_zone->therm_dev);
>> +
>> + mutex_lock(&th_zone->therm_dev->lock);
>> + /* Find the level for which trip happened */
>> + for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
>> + if (th_zone->therm_dev->last_temperature <
>> + th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
>> + break;
>> + }
>> +
>> + if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
>> + !th_zone->sensor_conf->trip_data.trigger_falling) {
>> + if (i > 0)
>> + th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
>> + else
>> + th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
>> + }
>> +
>> + snprintf(data, sizeof(data), "%u", i);
>> + kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
>> + mutex_unlock(&th_zone->therm_dev->lock);
>> +}
>> +
>> +/* Register with the in-kernel thermal management */
>> +int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
>> +{
>> + int ret;
>> + struct cpumask mask_val;
>> +
>> + if (!sensor_conf || !sensor_conf->read_temperature) {
>> + pr_err("Temperature sensor not initialised\n");
>> + return -EINVAL;
>> + }
>> +
>> + th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
>> + if (!th_zone)
>> + return -ENOMEM;
>> +
>> + th_zone->sensor_conf = sensor_conf;
>> + cpumask_set_cpu(0, &mask_val);
>> + th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
>> + if (IS_ERR(th_zone->cool_dev[0])) {
>> + pr_err("Failed to register cpufreq cooling device\n");
>> + ret = -EINVAL;
>> + goto err_unregister;
>> + }
>> + th_zone->cool_dev_size++;
>> +
>> + th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
>> + EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
>> + sensor_conf->trip_data.trigger_falling ?
>> + 0 : IDLE_INTERVAL);
>> +
>> + if (IS_ERR(th_zone->therm_dev)) {
>> + pr_err("Failed to register thermal zone device\n");
>> + ret = PTR_ERR(th_zone->therm_dev);
>> + goto err_unregister;
>> + }
>> + th_zone->mode = THERMAL_DEVICE_ENABLED;
>> +
>> + pr_info("Exynos: Kernel Thermal management registered\n");
>> +
>> + return 0;
>> +
>> +err_unregister:
>> + exynos_unregister_thermal();
>> + return ret;
>> +}
>> +
>> +/* Un-Register with the in-kernel thermal management */
>> +void exynos_unregister_thermal(void)
>> +{
>> + int i;
>> +
>> + if (!th_zone)
>> + return;
>> +
>> + if (th_zone->therm_dev)
>> + thermal_zone_device_unregister(th_zone->therm_dev);
>> +
>> + for (i = 0; i < th_zone->cool_dev_size; i++) {
>> + if (th_zone->cool_dev[i])
>> + cpufreq_cooling_unregister(th_zone->cool_dev[i]);
>> + }
>> +
>> + kfree(th_zone);
>> + pr_info("Exynos: Kernel Thermal management unregistered\n");
>> +}
>> diff --git a/drivers/thermal/samsung/exynos_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
>> new file mode 100644
>> index 0000000..da2add0
>> --- /dev/null
>> +++ b/drivers/thermal/samsung/exynos_thermal_common.h
>> @@ -0,0 +1,83 @@
>> +/*
>> + * exynos_thermal_common.h - Samsung EXYNOS common header file
>> + *
>> + * Copyright (C) 2013 Samsung Electronics
>> + * Amit Daniel Kachhap <amit.daniel@...sung.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
>> + *
>> + */
>> +
>> +#ifndef _LINUX_EXYNOS_THERMAL_COMMON_H
>> +#define _LINUX_EXYNOS_THERMAL_COMMON_H
>> +
>> +/* In-kernel thermal framework related macros & definations */
>> +#define SENSOR_NAME_LEN 16
>> +#define MAX_TRIP_COUNT 8
>> +#define MAX_COOLING_DEVICE 4
>> +#define MAX_THRESHOLD_LEVS 4
>> +
>> +#define ACTIVE_INTERVAL 500
>> +#define IDLE_INTERVAL 10000
>> +#define MCELSIUS 1000
>> +
>> +/* CPU Zone information */
>> +#define PANIC_ZONE 4
>> +#define WARN_ZONE 3
>> +#define MONITOR_ZONE 2
>> +#define SAFE_ZONE 1
>> +
>> +#define GET_ZONE(trip) (trip + 2)
>> +#define GET_TRIP(zone) (zone - 2)
>> +
>> +#define EXYNOS_ZONE_COUNT 3
>> +
>> +struct thermal_trip_point_conf {
>> + int trip_val[MAX_TRIP_COUNT];
>> + int trip_count;
>> + u8 trigger_falling;
>> +};
>> +
>> +struct thermal_cooling_conf {
>> + struct freq_clip_table freq_data[MAX_TRIP_COUNT];
>> + int freq_clip_count;
>> +};
>> +
>> +struct thermal_sensor_conf {
>> + char name[SENSOR_NAME_LEN];
>> + int (*read_temperature)(void *data);
>> + int (*write_emul_temp)(void *drv_data, unsigned long temp);
>> + struct thermal_trip_point_conf trip_data;
>> + struct thermal_cooling_conf cooling_data;
>> + void *private_data;
>> +};
>> +
>> +/*Functions used exynos based thermal sensor driver*/
>> +#ifdef CONFIG_EXYNOS_THERMAL_CORE
>> +void exynos_unregister_thermal(void);
>> +int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);
>> +void exynos_report_trigger(void);
>> +#else
>> +static inline void
>> +exynos_unregister_thermal(void) { return; }
>> +
>> +static inline int
>> +exynos_register_thermal(struct thermal_sensor_conf *sensor_conf) { return 0; }
>> +
>> +static inline void
>> +exynos_report_trigger(void) { return; }
>> +
>> +#endif /* CONFIG_EXYNOS_COMMON */
>> +#endif /* _LINUX_EXYNOS_THERMAL_COMMON_H */
>
>
--
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