1 files changed, 430 insertions, 0 deletions

diff --git a/drivers/thermal/samsung/exynos_thermal_common.c b/drivers/thermal/samsung/exynos_thermal_common.c
new file mode 100644
index 000000000000..c2301da08ac7
--- /dev/null
+++ b/drivers/thermal/samsung/exynos_thermal_common.c
@@ -0,0 +1,430 @@
+/*
+ * exynos_thermal_common.c - Samsung EXYNOS common thermal file
+ *
+ *  Copyright (C) 2013 Samsung Electronics
+ *  Amit Daniel Kachhap <amit.daniel@samsung.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/cpu_cooling.h>
+#include <linux/err.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;
+};
+
+/* Get mode callback functions for thermal zone */
+static int exynos_get_mode(struct thermal_zone_device *thermal,
+                        enum thermal_device_mode *mode)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        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)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        if (!th_zone) {
+                dev_err(&thermal->device,
+                        "thermal zone not registered\n");
+                return 0;
+        }
+
+        mutex_lock(&thermal->lock);
+
+        if (mode == THERMAL_DEVICE_ENABLED &&
+                !th_zone->sensor_conf->trip_data.trigger_falling)
+                thermal->polling_delay = IDLE_INTERVAL;
+        else
+                thermal->polling_delay = 0;
+
+        mutex_unlock(&thermal->lock);
+
+        th_zone->mode = mode;
+        thermal_zone_device_update(thermal);
+        dev_dbg(th_zone->sensor_conf->dev,
+                "thermal polling set for duration=%d msec\n",
+                thermal->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)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        int max_trip = th_zone->sensor_conf->trip_data.trip_count;
+        int trip_type;
+
+        if (trip < 0 || trip >= max_trip)
+                return -EINVAL;
+
+        trip_type = th_zone->sensor_conf->trip_data.trip_type[trip];
+
+        if (trip_type == SW_TRIP)
+                *type = THERMAL_TRIP_CRITICAL;
+        else if (trip_type == THROTTLE_ACTIVE)
+                *type = THERMAL_TRIP_ACTIVE;
+        else if (trip_type == THROTTLE_PASSIVE)
+                *type = THERMAL_TRIP_PASSIVE;
+        else
+                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)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        int max_trip = th_zone->sensor_conf->trip_data.trip_count;
+
+        if (trip < 0 || trip >= max_trip)
+                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)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        int max_trip = th_zone->sensor_conf->trip_data.trip_count;
+        /* Get the temp of highest trip*/
+        return exynos_get_trip_temp(thermal, max_trip - 1, temp);
+}
+
+/* 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 exynos_thermal_zone *th_zone = thermal->devdata;
+        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 0;
+
+        /* 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)) {
+                                dev_err(data->dev,
+                                        "error unbinding 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 exynos_thermal_zone *th_zone = thermal->devdata;
+        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 0;
+
+        /* 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)) {
+                                dev_err(data->dev,
+                                        "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)
+{
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+        void *data;
+
+        if (!th_zone->sensor_conf) {
+                dev_err(&thermal->device,
+                        "Temperature sensor not initialised\n");
+                return -EINVAL;
+        }
+        data = th_zone->sensor_conf->driver_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;
+        struct exynos_thermal_zone *th_zone = thermal->devdata;
+
+        if (!th_zone->sensor_conf) {
+                dev_err(&thermal->device,
+                        "Temperature sensor not initialised\n");
+                return -EINVAL;
+        }
+        data = th_zone->sensor_conf->driver_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(struct thermal_sensor_conf *conf)
+{
+        unsigned int i;
+        char data[10];
+        char *envp[] = { data, NULL };
+        struct exynos_thermal_zone *th_zone;
+
+        if (!conf || !conf->pzone_data) {
+                pr_err("Invalid temperature sensor configuration data\n");
+                return;
+        }
+
+        th_zone = conf->pzone_data;
+
+        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;
+        struct exynos_thermal_zone *th_zone;
+
+        if (!sensor_conf || !sensor_conf->read_temperature) {
+                pr_err("Temperature sensor not initialised\n");
+                return -EINVAL;
+        }
+
+        th_zone = devm_kzalloc(sensor_conf->dev,
+                                sizeof(struct exynos_thermal_zone), GFP_KERNEL);
+        if (!th_zone)
+                return -ENOMEM;
+
+        th_zone->sensor_conf = sensor_conf;
+        /*
+         * TODO: 1) Handle multiple cooling devices in a thermal zone
+         *       2) Add a flag/name in cooling info to map to specific
+         *       sensor
+         */
+        if (sensor_conf->cooling_data.freq_clip_count > 0) {
+                cpumask_set_cpu(0, &mask_val);
+                th_zone->cool_dev[th_zone->cool_dev_size] =
+                                        cpufreq_cooling_register(&mask_val);
+                if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
+                        dev_err(sensor_conf->dev,
+                                "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, sensor_conf->trip_data.trip_count,
+                        0, th_zone, &exynos_dev_ops, NULL, 0,
+                        sensor_conf->trip_data.trigger_falling ? 0 :
+                        IDLE_INTERVAL);
+
+        if (IS_ERR(th_zone->therm_dev)) {
+                dev_err(sensor_conf->dev,
+                        "Failed to register thermal zone device\n");
+                ret = PTR_ERR(th_zone->therm_dev);
+                goto err_unregister;
+        }
+        th_zone->mode = THERMAL_DEVICE_ENABLED;
+        sensor_conf->pzone_data = th_zone;
+
+        dev_info(sensor_conf->dev,
+                "Exynos: Thermal zone(%s) registered\n", sensor_conf->name);
+
+        return 0;
+
+err_unregister:
+        exynos_unregister_thermal(sensor_conf);
+        return ret;
+}
+
+/* Un-Register with the in-kernel thermal management */
+void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
+{
+        int i;
+        struct exynos_thermal_zone *th_zone;
+
+        if (!sensor_conf || !sensor_conf->pzone_data) {
+                pr_err("Invalid temperature sensor configuration data\n");
+                return;
+        }
+
+        th_zone = sensor_conf->pzone_data;
+
+        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]);
+        }
+
+        dev_info(sensor_conf->dev,
+                "Exynos: Kernel Thermal management unregistered\n");
+}