1 files changed, 432 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..f10a6ad37c06
--- /dev/null
+++ b/drivers/thermal/samsung/exynos_thermal_common.c
@@ -0,0 +1,432 @@
+/*
+ * 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->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;
+	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");
+}